EP0131475B1 - Method and apparatus for wrapping a roll of fibres in a protective wrap - Google Patents

Method and apparatus for wrapping a roll of fibres in a protective wrap Download PDF

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Publication number
EP0131475B1
EP0131475B1 EP84400810A EP84400810A EP0131475B1 EP 0131475 B1 EP0131475 B1 EP 0131475B1 EP 84400810 A EP84400810 A EP 84400810A EP 84400810 A EP84400810 A EP 84400810A EP 0131475 B1 EP0131475 B1 EP 0131475B1
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EP
European Patent Office
Prior art keywords
bale
protective wrapping
protective
wrapping
conveyor belt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84400810A
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German (de)
French (fr)
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EP0131475A1 (en
Inventor
Werner Skripalle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saint Gobain Isover SA France
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Saint Gobain Isover SA France
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Publication date
Application filed by Saint Gobain Isover SA France filed Critical Saint Gobain Isover SA France
Priority to AT84400810T priority Critical patent/ATE24160T1/en
Publication of EP0131475A1 publication Critical patent/EP0131475A1/en
Application granted granted Critical
Publication of EP0131475B1 publication Critical patent/EP0131475B1/en
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B63/00—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged
    • B65B63/04—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for folding or winding articles, e.g. gloves or stockings

Definitions

  • the invention relates to a method for wrapping a rotating bale, consisting of a continuous strip of coated mineral fibers, in the form of a felt roll, the coating having a closed outer surface, in a protective envelope deposited during of the winding of the bale, with a view to its packaging, according to the preamble of claim 1, as well as a device specially suitable for carrying out said method, according to the preamble of claim 7.
  • mineral fibers provided with a binder are deposited on a production line, they are compacted to the desired extent and they are hardened in a tunnel oven, after which, on the felt thus produced, a covering strip, for example aluminum, is applied and glued.
  • the coated felt mat thus obtained is cut lengthwise and the cut sections are rolled up into bales and wrapped in a protective envelope made of paper or a sheet of plastic, the whole being thus held together to stoackge and transport.
  • a coated felt roll is produced and sold by the plaintiff under the registered trademark "ROLLISOL”; it is mainly used to insulate the interior of the covers, between the rafters.
  • sections of the protective envelope, cut to the required length are placed on a conveyor, and, in connection with the advance movement of the felt roll, sends them to the winding station, so that the front end of the protective casing, when entering the winding station, is wedged in the angle formed between the outer face of the already wound felt and the inner face of the rear end of the felt, and is thus driven.
  • the ball thus formed continues to rotate and then wraps, from its front end the protective envelope around the outer face of the ball, until its rear end covers a previously wound middle region, from the 'protective envelope.
  • the rear end has been previously coated with a fast-setting, long-acting glue and is pressed during the winding movement, so that the bale roller is closed and fixed in this position by the envelope. Then, the bale is expelled from the winding station and, in the case where a shrink sheet protruding on both sides is used as a protective envelope, after passing through a heating zone (for the purpose of shrinking the edges to protect edges), it is stored and removed.
  • the object of the invention is to find a method, of the type indicated in the preamble of claim 1, with which the consumption of material for the protective envelope can be considerably reduced without having to forgo continuous packaging. all over the periphery, and without the aforementioned preparation disadvantages.
  • the front end of the protective envelope is not penetrated into the winding, passing over the rear end of the carpet of mineral fibers to drive the protective envelope without the intervention of glue, but the protective envelope adheres to the bare outer surface of the felt formed by the closed surface covering strip.
  • a bond is thus obtained only by adhesion, which can be undone by the user during the unpacking of the wound felts without deterioration of the covering strip, but there must not be an overlap between the protective casing and the last felt tower, with the ensuing drawbacks.
  • This adhesion of the front end of the protective envelope will be done expediently by controlling the instant of admission of the envelope into the zone which is roughly opposite the rear end of the fiber mat and which is as little as possible influenced by it.
  • the rear end of the The protective covering is at the same distance from the rear end of the fiber mat as from the front end. This is why the bonding of the rear end of the protective envelope, with corresponding spacing from the rear end of the type of fibers, is therefore also carried out without complications, as well as without the additional need for material for the 'protective envelope.
  • the rear end of the fiber mat is located in a middle region of the protective envelope and is fully stretched by it, without affecting the area of adhesion to the front end of the envelope of protection and the bonding zone at the front end of the protective envelope and the bonding zone at the rear end of this same envelope.
  • the protective envelope is therefore arranged without any covering with the fiber mat, in the manner of a banner around the outer contour of the bale, the length of the protective envelope exceeding the nominal circumference of the bale, only by the width of the bonding area at the periphery, for example 20 cm. For a bale with an average diameter of 55 cm, it therefore results, instead of a length of the protective envelope largely exceeding 3 m, a length of only about 1.9 m, i.e. a saving of material around 40% on a protective envelope.
  • the front end of the protective envelope is lined with a strip of glue and inserted between the rotating bale of cardboard and the lower support roller, so that a bond is obtained between the front end of the protective sheet and the outer surface of the carton essentially at the side of the bale opposite that of the rear end of the tarred cardboard. Due to the rapid establishment of the bonding bond between the front end of the protective sheet and the bale, an additional quantity of the protective sheet is stretched after the rotation of the bale and is wound tightly tensioned around the bale, until the rear end of the protective sheet covers the front end and is then also fixed with a glue.
  • the packaging using a protective sheet serves not only to form an external protection, but also to maintain the rolled shape of the bale.
  • the protective sheet is brought into the final phase of winding the ball in rotation so that under the conditions of production techniques, this results in a guaranteed drive of the front end of the protective sheet, because there is no risk of sticking the protective sheet because of the tendency of the felt coating to be damaged.
  • Claims 2 to 6 relate to advantageous improvements to the process according to the invention and relate in particular to advantageous possibilities which entail the bonding by adhesion of the anterior end of the protective sheet to the naked external contour, with closed surface, of the wound ball, so that when the user of the wound material removes the protective cover, he cannot produce any deterioration of the coating of the felt roll.
  • water at low surface tension is particularly suitable as a bonding agent between the protective covering and the closed outer surface of the felt roll. It is also possible to use a liquid hydrocarbon. In the case of water, it gradually vaporizes, and an oil, or the like, makes it possible during unpacking by the user to remove the production sheet effortlessly.
  • the single figure shows the simplified diagram of a side view of a device according to the invention.
  • 1 denotes a continuous belt for the transport of the mineral fiber mat 2 of which the FIG. 3 represents the terminal zone constituted by a separate conveyor belt.
  • a winding station 4 disposed at the end of the terminal zone 3, a winding, or a bale 5, of the fiber mat 2 has already been formed, as is well known. .
  • the front edge of the fiber mat 2 reaches the region of a lifting train 6, at the end of the conveyor belt 1; it is deflected upwards there (in the figure), as well as bent along an arc of a circle, which is taken up by a device 8 with carding rollers, in reciprocating movement according to the double arrow 7, and which turns back on the dorsal face of wound material 2.
  • a device 8 with carding rollers in reciprocating movement according to the double arrow 7, and which turns back on the dorsal face of wound material 2.
  • the entire length of a cut section of material to be wound 2 is wound in a bale 5, the mean diameter of which, indicated in phantom, could have a value 55 cm for example.
  • the rear end 2 thereof protrudes from the mean diameter d and forms a terminal step a few centimeters in height, depending on the thickness of the material to be wound which comes from be treated, for example in the form of a felt roll under a covering strip.
  • the bale 5 is constituted in the usual manner previously exposed, it must then be wrapped, around its entire periphery, in a protective envelope 9, which is kept available on a conveyor belt 10, located above the band conveyor 1 of the material to be wound 2, and which, after constitution of a bale 5, is brought intermittently onto the outer contour of the rotating bale 5.
  • the positioning of the protective casing 9 is carried out in the usual way for this purpose, namely that sections of protective casing 9 are produced, coming from a supply roller, and that these are transported on the conveyor belt 10, directly from the winding station 4, until the front edge 9a of the protective casing 9 which, in the working position shown in the figure, is already applied to the outer contour of the bale 5, comes to rest on a location 11 in the front end section of the conveyor belt 10.
  • the conveyor belt 10 can be made up in a well known manner, of a multiplicity of relatively narrow belts, located next to each other, which move on suction boxes 10a, which can create a depression in the space between neighboring conveyor belts. If no vacuum is applied, the protective envelope 9 rests on and is driven by the narrow conveyor belts. As soon as the protective casing section 9 must be stopped, the vacuum is put into service and it attracts the protective casing in the zone between the conveyor belts which continue to move, on the immobile surface of the casings 1 Oa , so that the protective cover is protected against entrainment by the conveyor belts which continue to move.
  • FIG. 1 shows an intermediate position of this driving movement, in which the front edge 9a of the protective casing 9, after pressure applied by the lifting train 6, which can also consist of a conveyor belt, has already been driven over more than half a turn of the bale 5 and moves in the direction of the carding roller device 8.
  • the rear end 9b of the protective casing section 9 still rests on the conveyor belt 10 and, due to the traction exerted by the rotating ball 5 on the protective casing 9, possibly seconded p ar belts of the conveyor belt 10, in slower movement, it is driven and introduced into the winding station 4.
  • the rear end 2a of the material to be wound 2 passes first of all past the exit zone of the conveyor belt 10 from the protective casing 9, while a significant length of the protective envelope 9 still rests on the conveyor belt 10 and is driven under traction from there.
  • the bonding area produced on the outer face of the area of the front edge 9a of the protective envelope 9, between the outer face of the area of the front edge 9a and the inner face of the area of the rear edge 9b of the envelope protection 9, is located at a significant distance from the protruding rear end 2a of the material to be wound and, consequently, it is to a large extent removed from the influence of the latter.
  • forces are applied in the bonding zone, by elastic reaction of the rear end 2a, these are exclusively shearing forces, which can be easily absorbed by bonding; spacers, which would tend to separate from one another the two parts of the protective envelope bonded in superposition, do not appear in any case.
  • the rear end 2a of the material to be wound 2 is covered by the protective envelope 9 at a time when a long part of the protective envelope 9 is still applied to the conveyor belt 10 and is retained there by friction, which can even possibly be increased by the establishment of a slight depression in the suction boxes 10a, so that the protective casing 9 severely stressed, under notable tensile stress, the rear end 2a of the material to be wound 2, and thus blocks it, after lifting the rear end 2a from the plane of the conveyor belt 1.
  • the outer contour of the bale 5 finished, wrapped in the protective envelope 9 is better suited to the ideal nominal contour, even in the area of the protruding rear end 2a, which not only improves the visual appearance, but also, thanks to an improved rolling possibility, to a possibility of e intact storage, etc. also facilitates subsequent handling of the finished product.
  • the only length necessary for the protective envelope 9 is that which provides sufficient overlap in the area of the front edge 9a and the rear edge 9b located above, so that the length of the protective envelope 9 on the outer contour of the ball 5 only needs to correspond to the length of the contour, plus the overlap (of 20 cm for example) necessary for bonding.
  • the front edge 9a of the protective envelope in the angular position shown of the bale 5, could however be located anywhere on the bale 5, in the range between the application surfaces of the conveyor belt 1 and the lifting gear 6, without this causing some disturbances, or even simply significant changes in the packaging conditions. Thanks to the prescription of a determined length of the section used of the protective envelope 9, the rear edge 9b of the protective envelope 9, after a complete revolution, is automatically placed on the outer surface of the front edge 9a, changes in the position of the front edge on the contour of the ball resulting only in a corresponding change in the position of the bonding location, without disturbing changes in working conditions.
  • the compressed air boxes 1b and 6b can be operated with a supply pressure of 400 to 500 mm of water approximately and, by means of an appropriate arrangement and dimensioning of the blowing orifices, they cause by air flow a pressure complementary to the front edge 9a of the protective envelope 9 on the outer contour of the belt 5 on the conveyor belt 1 or on the lifting belt 6. It has been found that up to speeds of the material to be wound 2 on the conveyor belt 1 of the order of 80 m / min, such assistance by compressed air boxes, 1b or 6b, can be dispensed with without problem. However, for higher feeding speeds, which can go up to 140 m / min, or even more, the assistance by compressed air which has just been described can be of great value.
  • the adhesion effect of the front edge 9a of the protective casing 9 on the bare, continuous surface exterior contour of the ball 5 can be obtained in different ways.
  • the protective envelope 9 can be electrostatically charged, in a well known manner, which is not shown in more detail, and adhere under the effect of this charge.
  • the adhesion effect due to the load need not in any way be limited to the front edge 9a of the protective casing 9, but may increase, over its entire surface, the friction drive. of the protective casing 9 on the outer contour of the rotating ball 5.
  • the precondition for such an electrostatic charge, either of the protective casing 9, or of the surface of the outer contour of the ball 5, is however a suitable choice of material, so that adhesion by electrostatic charge cannot be obtained in all cases.
  • a bonding aid unlike the adhesive which can be applied at the same time in the area of the rear edge 9b of the protective casing 9, must however not create any durable bonded assembly or similar phenomenon, but only one adhesion during wrapping which either must have disappeared at the latest when the protective covering 9 is removed by the user of the wound material 2, or else must be formed from the start in such a way that its elimination is possible without problem without deterioration of the external surface of the ball 5.
  • peeling aid it is possible, by way of example, to envisage a material whose adhesion effect can be eliminated by a peeling effect (known as “peel-off”), as it is d for use with so-called adhesive seals.
  • water with low surface tension is used as the bonding aid.
  • Water at low surface tension is a good wetting liquid, which forms a continuous film and therefore provides a good adhesion effect.
  • the water, which is introduced in small quantities is evacuated very simply by drying and evaporates in this way, so that when the protective envelope is removed 9 by the user, its front end 9a is applied simply, without any effect of adhesion or other connection, on the outer contour of the ball 5, and is detached from the latter after dissociation of the bonded assembly.
  • low surface tension water is inexpensive, easy to handle and treat.
  • a sponge 13 which is fixed on a pivoting ramp 14 and which is impregnated, in a manner not shown in more detail, with the liquid constituting the bonding aid.
  • the pivoting ramp 14 is arranged, in the direction of supply of the protective envelope 9, just before the stop location 11 for the front edge 9a of the protective envelope 9; it can be lowered on the surface of the conveyor belt 10 and lift again from it, according to the double arrow 15; it is also movable, in a manner not shown in more detail, normally in the plane of the figure, along the front edge 9a of the protective envelope 9.
  • the sponge 13 thus performs, on the upper face of the protective envelope 9, in the zone from its front edge 9a, a sweeping movement, which guarantees the appropriate supply of a continuous liquid film.
  • the protective envelope 9 With a zone thus wetted from the front edge 9a, the protective envelope 9, by removing the vacuum in the suction boxes (1 Oa arrives at the bare peripheral surface of the ball 5, at a distance as large as possible from the rear end 2a of the material to be wound 2, adheres to it and is driven, passing through the intermediate position shown, until the rear edge 9b of the protective casing 9 covers the driven front edge 9a and there In this way, it is possible to produce balls completely wrapped around the entire periphery, with a well-rounded peripheral surface, with low consumption of material for the protective envelope 9, in rapid succession, so that , depending on the speed of supply of the material to be wound 2 on the conveyor belt, it is possible to manufacture all-wrapped bales with unit times less than 10 seconds, under the best possible conditions of product safety ction.

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  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Basic Packing Technique (AREA)
  • Storage Of Harvested Produce (AREA)
  • Nonwoven Fabrics (AREA)
  • Packaging Of Special Articles (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Replacement Of Web Rolls (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)
  • Road Signs Or Road Markings (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Packages (AREA)
  • Road Repair (AREA)
  • Dowels (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Wrappers (AREA)
  • Ropes Or Cables (AREA)
  • Winding Of Webs (AREA)

Abstract

A process for wrapping a rotating bale of mineral fiber strip in the form of a felt-roll with an outer closed-face backing strip with protective wrapping applied as part of the winding process for packaging which entails bringing the protective wrapping, having a coating of adhesive material at the back end thereof into the circumferential area of the rotating bale with the front end thereof, with a length exceeding the circumference of the bale and being frictionally connected to the bale; and turning the bale and pressing the back end of the protective wrapping onto the outside of the winding of the protective wrapping, therebelow, to attain a lasting bonding, wherein the frictional sticking connection between the front end of the protective wrapping and the bale is produced exclusively by an adhesive effect, between the inner surface facing the bale and the bare outer surface of the backing strip, and the front end of the protective wrapping is placed on the bale at a distance from the outside end of the last winding of the felt roll, and wherein the length of the protective wrapping exceeds the circumference of the enclosed bale substantially only by the circumferential width of the bonding zone between the back end of the protective wrapping and the outside of the winding of the protective wrapping lying thereunder.

Description

L'invention concerne un procédé pour envelopper une balle en rotation, constituée d'une bande continue de fibres minérales revêtue, sous la forme d'un rouleau de feutre, le revêtement ayant une surface extérieure fermée, dans une enveloppe de protection déposée au cours de l'enroulement de la balle, en vue de son conditionnement, selon le préambule de la revendication 1, ainsi qu'un dispositif spécialement approprié à l'exécution dudit procédé, selon le préambule de la revendication 7.The invention relates to a method for wrapping a rotating bale, consisting of a continuous strip of coated mineral fibers, in the form of a felt roll, the coating having a closed outer surface, in a protective envelope deposited during of the winding of the bale, with a view to its packaging, according to the preamble of claim 1, as well as a device specially suitable for carrying out said method, according to the preamble of claim 7.

Pour fabriquer un rouleau de feutre revêtu, on dépose sur une chaîne de production, des fibres minérales pourvues d'un liant, on les compacte dans la mesure voulue et on les durcit dans un four tunnel, après quoi, sur le feutre ainsi réalisé, on applique et colle une bande de revêtement, par exemple en aluminium. Le tapis de feutre revêtu ainsi obtenu est découpé dans le sens de la longueur et les sections découpées sont enroulées en balles et enveloppées dans une enveloppe de protection, constituée de papier ou d'une feuille de matière plastique, le tout étant maintenu ainsi ensemble pour le stoackge et le transport. Un rouleau de feutre revêtu est fabriqué et mis en vente par la demanderesse, sous la marque déposée «ROLLISOL»; il sert principalement à assurer l'isolation par l'intérieur des couvertures, entre les chevrons.To make a roll of coated felt, mineral fibers provided with a binder are deposited on a production line, they are compacted to the desired extent and they are hardened in a tunnel oven, after which, on the felt thus produced, a covering strip, for example aluminum, is applied and glued. The coated felt mat thus obtained is cut lengthwise and the cut sections are rolled up into bales and wrapped in a protective envelope made of paper or a sheet of plastic, the whole being thus held together to stoackge and transport. A coated felt roll is produced and sold by the plaintiff under the registered trademark "ROLLISOL"; it is mainly used to insulate the interior of the covers, between the rafters.

Pour envelopper la balle en cours de bobinage dans l'enveloppe de protection, on place sur un convoyeur des sections de l'enveloppe de protection, découpées à longueur requise, et, en liaison avec le mouvement d'avance du rouleau de feutre, on les envoie au poste de bobinage, de façon telle que l'extrémité avant de l'enveloppe de protection, lors de l'admission dans le poste de bobinage, soit coincée dans l'angle formé entre la face extérieure du feutre déjà bobiné et la face intérieure de l'extrémité arrière du feutre, et soit ainsi entraînée. Ensuite, la balle ainsi constituée continue à tourner et enroule alors, a partir de son extrémité avant l'enveloppe de protection autour de la face extérieure de la balle, jusqu'à ce que son extrémité arrière recouvre une zone médiane précédemment bobinée, de l'enveloppe de protection. L'extrémité arrière a été garnie au préalable d'une colle à prise rapide, agissant de façon durable, et elle est pressée au cours du mouvement d'enroulement, de façon que le rouleau constituant de la balle soit fermé et fixé dans cette position par I'enveloppe. Ensuite, la balle est expulsée du poste de bobinage et, dans le cas où l'on utilise comme enveloppe de protection une feuille rétractile débordant des deux côtés, après passage à travers une zone de réchauffement (en vue de la rétraction des bords pour protéger les arêtes), elle est entreposée et enlevée.To wrap the bale being wound in the protective envelope, sections of the protective envelope, cut to the required length, are placed on a conveyor, and, in connection with the advance movement of the felt roll, sends them to the winding station, so that the front end of the protective casing, when entering the winding station, is wedged in the angle formed between the outer face of the already wound felt and the inner face of the rear end of the felt, and is thus driven. Then, the ball thus formed continues to rotate and then wraps, from its front end the protective envelope around the outer face of the ball, until its rear end covers a previously wound middle region, from the 'protective envelope. The rear end has been previously coated with a fast-setting, long-acting glue and is pressed during the winding movement, so that the bale roller is closed and fixed in this position by the envelope. Then, the bale is expelled from the winding station and, in the case where a shrink sheet protruding on both sides is used as a protective envelope, after passing through a heating zone (for the purpose of shrinking the edges to protect edges), it is stored and removed.

L'entraînement de l'extrémité avant de l'enveloppe de protection par la balle en rotation, obtenu parce que l'extrémité avant y pénètre en même temps que la dernière spire du feutre et y est bloquée, est connu: simplement à titre d'exemple, renvoyons à ce sujet aux demandes de brevets allemands 1 239 979 et 1 461 821 ou au brevet US 3 052 073. Ce procédé, destiné à obtenir automatiquement, au cours de l'opération de bobinage, un enveloppement parfaitement continu sur tout le pourtour, grâce à une enveloppe de protection, a remplacé le procédé antérieur, qu'on peut trouver par exemple dans le brevet US 2 681 702, suivant lequel c'était seulement la bande de feutre que l'on enroulait tandis que la dernière spire de la balle était ensuite maintenue et scellée par une petite bande adhésive; il est bien évident qu'un tel dispositif de scellement par une petite bande adhésive, en raison de sa faible résistance aux détériorations, ne suffit pas à lui seul à assurer la sécurité dans le transport.The drive of the front end of the protective envelope by the rotating ball, obtained because the front end enters it at the same time as the last turn of the felt and is blocked there, is known: simply by way of For example, refer to German patent applications 1 239 979 and 1 461 821 or to US patent 3 052 073 on this subject. This process, intended to automatically obtain, during the winding operation, a perfectly continuous wrapping over all the periphery, thanks to a protective envelope, replaced the previous process, which can be found for example in US Patent 2,681,702, according to which it was only the felt strip that was wound while the last turn of the ball was then held and sealed by a small adhesive strip; it is obvious that such a sealing device with a small adhesive strip, due to its low resistance to deterioration, is not sufficient in itself to ensure safety in transport.

Un problème recontré de longue date, concernantA long-standing problem concerning

l'enveloppement parfaitement continu sur tout le pourtour, tient à ce que la consommation de matériau d'emballage, sous la forme de l'enveloppe de protection, est très élevée par balle. Ceci a essentiellement trois causes:

  • 1. Si l'on veut garantir un entraînement impeccable de l'enveloppe de protection entre l'extrémité du feutre et la couche de feutre précédemment enroulée, l'extrémité avant de l'enveloppe de protection doit recouvrir une partie relativement importante de l'extrémité du feutre, en règle générale plusieurs décimètres, d'autant plus que la pression de serrage, en raison de la déformabilité du feutre n'est pas tellement élevée et que c'est seulement quelque temps après l'admission de l'extrémité avant de l'enveloppe de protection, au cours du mouvement ultérieur de bobinage, qu'elle devient pleinement affi- cace. Ainsi, le fabricant d'un poste de bobinage utilisé dans la pratique recommande d'adopter une longueur de recouvrement de 0,5 m, entre l'extrémité arrière de la bande de feutre et l'extrémité avant de l'enveloppe de protection.
  • 2. Après une rotation de la balle avec l'enveloppe de protection, celle-ci parvient, en suivant la face extérieure, dans la zone de l'extrémité de la bande de feutre. La bande de feutre présente une épaisseur d'au moins quelques centimètres, en règle générale de 10 cm ou plus, si bien que son extrémité arrière écarte la partie de l'enveloppe de protection qui la recouvre de l'enveloppe de protection sousjacente. C'est pourquoi l'enveloppe de protection, soumise à une tension et à une compression de la part de l'extrémité du feutre, doit être prolongée d'une bonne longueur au delà de cette extrémité arrière, si l'on veut obtenir une zone de collage avec la spire précédente de l'enveloppe de protection, qui par suite de l'éloignement de l'effort d'écartement de cette extrémité arrière, est suffisamment déchargée de cet effort pour garantir un collage sûr au cours du processus d'enroulement. La longueur nécessaire derrière l'extrémité de la bande de feutre, pour la solidarisa- tion de l'enveloppe supérieure avec la spire précédente, peut également être de quelques décimètres.
  • 3. Dans des conditions sévères de production, on ne peut pas exclure de petites perturbations instantanées de la commande d'amenée de l'enveloppe de protection, ainsi que de faibles modifications des réglages, par exemple celui du mécanisme d'avance de l'enveloppe de protection. C'est pourquoi il arrive, fréquemment, qu'une enveloppe de protection pénètre dans l'enroulement d'une manière légèrementdif- férente de celle prévue par la commande. En particulier, pour de grandes vitesses de protuction, de tels faibles écarts peuvent entraîner une variation considérable du taux de recouvrement entre la zone de l'extrémité avant de l'enveloppe de protection et la zone de l'extrémité arrière du feutre. Si donc on veut éviter des conditionnements défectueux dus à des variations, en cours de fonctionnement, de l'instant de l'admission de l'enveloppe de protection, on doit travailler, d'une part, avec une longueur nominale de recouvrement telle que, même en cas de retard de l'admission, il soit encore garanti un recouvrement et un entraînement suffisants, et, d'autre part, avec des longueurs de l'enveloppe de protection telles que, dans le cas d'une admission légèrement prématurée, l'extrémité arrière du feutre sur l'enroulement soit encore recouverte, sur une longueur suffisante, par l'enveloppe et qu'un collage correct soit assuré assez loin de l'extrémité arrière du feutre.
the perfectly continuous wrapping around the entire perimeter is due to the fact that the consumption of packaging material, in the form of the protective envelope, is very high per bullet. This has essentially three causes:
  • 1. If one wishes to guarantee an impeccable drive of the protective envelope between the end of the felt and the previously wound layer of felt, the front end of the protective envelope must cover a relatively large part of the end of the felt, as a rule several decimeters, especially since the clamping pressure, due to the deformability of the felt is not so high and that it is only some time after the admission of the front end of the protective envelope, during the subsequent winding movement, that it becomes fully effective. Thus, the manufacturer of a winding station used in practice recommends adopting a covering length of 0.5 m, between the rear end of the felt strip and the front end of the protective casing.
  • 2. After a rotation of the ball with the protective envelope, it arrives, following the outside, in the area of the end of the felt strip. The felt strip has a thickness of at least a few centimeters, as a rule of 10 cm or more, so that its rear end separates the part of the protective envelope which covers it from the underlying protective envelope. This is why the protective envelope, subjected to a tension and a compression from the end of the felt, must be extended by a good length beyond this rear end, if one wants to obtain a bonding area with the previous turn of the protective casing, which, as a result of the separation force being moved away from this rear end, is sufficiently relieved of this force to guarantee safe bonding during the process of winding. The length required behind the end of the felt strip, for the attachment of the upper envelope with the preceding turn, may also be a few decimeters.
  • 3. In severe production conditions, it is not possible to exclude small instantaneous disturbances in the control of the supply of the protective casing, as well as slight modifications of the settings, for example that of the advance mechanism of the protective cover. This is why it frequently happens that a protective envelope penetrates the winding in a slightly different manner from that provided by the control. In particular, for high speeds of protuction, such small differences can cause a considerable variation in the recovery rate between the area of the front end of the protective casing and the area of the rear end of the felt. If therefore we want to avoid defective packaging due to variations, during operation, from the moment of admission of the protective envelope, we must work, on the one hand, with a nominal length of overlap such that , even in the event of delay in admission, it is still guaranteed sufficient recovery and training, and, on the other hand, with lengths of the protective covering such that, in the case of a slightly premature admission , the rear end of the felt on the winding is still covered, over a sufficient length, by the envelope and that a correct bonding is ensured far enough from the rear end of the felt.

En pratique, cela entraîne que, pour envelopper une balle d'un diamètre moyen de 55 cm, et par conséquent d'un périmètre nominal de 173 cm, il est utilisé une longueur de l'enveloppe de protection qui est supérieure à 3 m, soit à peu près le double du périmètre nominal. Il est évident que, dans le cas d'une production en grande série, même avec un matériau bon marché (tel que le papier) comme enveloppe de protection, cela entre en ligne de compte de façon tout à fait notable; avec un matériau plus cher, comme par exemple une feuille de plastique rétractable, cela entraîne un renchérissement notable, d'autant plus qu'en pratique l'enveloppe de protection utilisée est imprimée sur toute sa longueur.In practice, this means that, to wrap a bale with an average diameter of 55 cm, and therefore with a nominal perimeter of 173 cm, a length of the protective envelope is used which is greater than 3 m, or almost double the nominal perimeter. It is obvious that, in the case of mass production, even with a cheap material (such as paper) as a protective envelope, this comes into play quite significantly; with a more expensive material, such as for example a shrinkable plastic sheet, this results in a significant increase in cost, especially since in practice the protective envelope used is printed over its entire length.

L'objet de l'invention est de trouver un procédé, du genre indiqué dans le préambule de la revendication 1, avec lequel la consommation de matière pour l'enveloppe de protection peut être considérablement réduite sans qu'on renonce à l'emballage continu sur toute la périphérie, et sans les inconvénients de préparation précités.The object of the invention is to find a method, of the type indicated in the preamble of claim 1, with which the consumption of material for the protective envelope can be considerably reduced without having to forgo continuous packaging. all over the periphery, and without the aforementioned preparation disadvantages.

La solution de ce problème s'obtient en mettant en oeuvre les caractéristiques de la revendication 1.The solution to this problem is obtained by implementing the features of claim 1.

Selon celles-ci, on ne fait pas pénétrer l'extrémité avant de l'enveloppe de protection dans le bobinage, en passant sur l'extrémité arrière du tapis de fibres minérales pour entraîner l'enveloppe de protection sans l'intervention de colle, mais l'enveloppe de protection adhère à la surface extérieure nue du feutre formée par la bande de revêtement à surface fermée. On obtient ainsi une liaison uniquement par adhérence, qui peut être défaite par l'utilisateur lors du déballage des feutres enroulés sans détérioration de la bande de revêtement, mais il ne faut pas que se produise un chevauchement entre l'enveloppe de protection et le dernier tour du feutre, avec les inconvénients qui s'ensuivent. Cette adhérence de l'extrémité avant de l'enveloppe de protection se fera opportunément en commandant l'instant d'admission de l'enveloppe dans la zone qui est à peu près opposée à l'extrémité arrière du tapis de fibres et qui se trouve aussi peu que possible influencée par celui-ci. Alors, des écarts, même de quelques décimètres, pour des diamètres de rouleaux d'un demi-mètre ou plus, n'ont pas en pratique d'inconvénients, car il importe seulement que, ni l'adhérence de l'extrémité avant de l'enveloppe de protection, ni le collage ultérieur de l'extrémité arrière de l'enveloppe de protection ne soient influencés par l'extrémité arrière du tapis de fibres; c'est pourquoi sont inutiles de hautes exigences en précision de commande pour l'admission de l'enveloppe de protection et sont admissibles en pratique des écarts considérables par rapport à l'instant d'admission requis, sans que cela donne lieu à de quelconques perturbations et, en particulier, sans que cela nécessite une compensation au moyen de la mise à disposition d'une longueur plus grande de l'enveloppe de protection. Du fait du dimensionnement de l'enveloppe de protection à une longueur qui est à peine plus grande, (à savoir: de la largeur de la zone de collage à la périphérie) que la périphérie nominale de la balle, l'extrémité arrière de l'enveloppe de protection se trouve à la même distance de l'extrémité arrière du tapis de fibres que de l'extrémité avant. C'est pourquoi le collage de l'extrémité arrière de l'enveloppe de protection, à écartement correspondant de l'extrémité arrière du typis de fibres, s'effectue aussi de ce fait sans complications, ainsi que sans besoin supplémentaire de matière pour l'enveloppe de protection. L'extrémité arrière du tapis de fibre se situe dans une zone médiane de l'enveloppe de protection et elle est tendue à fond par celle-ci, sans qu'elle influence la zone d'adhérence à l'extrémité avant de l'enveloppe de protection et la zone de collage à l'extrémité avant de l'enveloppe de protection et la zone de collage à l'extrémité arrière de cette même enveloppe. L'enveloppe de protection est donc disposée sans aucun recouvrement avec le tapis de fibres, à la manière d'une banderole autour du contour extérieur de la balle, la longueur de l'enveloppe de protection excédant la circonférence nominale de la balle, seulement de la largeur de la zone de collage à la périphérie, par exemple de 20 cm. Pour une balle d'un diamètre moyen de 55 cm, il en résulte donc, au lieu d'une longueur de l'enveloppe de protection dépassant largement 3 m, une longueur d'environ 1,9 m seulement, soit une économie de matière de l'ordre de 40% sur une enveloppe de protection.According to these, the front end of the protective envelope is not penetrated into the winding, passing over the rear end of the carpet of mineral fibers to drive the protective envelope without the intervention of glue, but the protective envelope adheres to the bare outer surface of the felt formed by the closed surface covering strip. A bond is thus obtained only by adhesion, which can be undone by the user during the unpacking of the wound felts without deterioration of the covering strip, but there must not be an overlap between the protective casing and the last felt tower, with the ensuing drawbacks. This adhesion of the front end of the protective envelope will be done expediently by controlling the instant of admission of the envelope into the zone which is roughly opposite the rear end of the fiber mat and which is as little as possible influenced by it. So deviations, even of a few decimeters, for roll diameters of half a meter or more, do not in practice have drawbacks, because it only matters that neither the adhesion of the front end of the protective covering, or the subsequent bonding of the rear end of the protective covering, is not influenced by the rear end of the fiber mat; this is why high demands on control accuracy for the admission of the protective envelope are unnecessary and in practice considerable deviations from the required admission time are admissible, without giving rise to any kind of disturbances and, in particular, without this requiring compensation by means of the provision of a greater length of the protective envelope. Due to the dimensioning of the protective envelope to a length which is barely greater, (namely: the width of the bonding zone at the periphery) than the nominal periphery of the bale, the rear end of the The protective covering is at the same distance from the rear end of the fiber mat as from the front end. This is why the bonding of the rear end of the protective envelope, with corresponding spacing from the rear end of the type of fibers, is therefore also carried out without complications, as well as without the additional need for material for the 'protective envelope. The rear end of the fiber mat is located in a middle region of the protective envelope and is fully stretched by it, without affecting the area of adhesion to the front end of the envelope of protection and the bonding zone at the front end of the protective envelope and the bonding zone at the rear end of this same envelope. The protective envelope is therefore arranged without any covering with the fiber mat, in the manner of a banner around the outer contour of the bale, the length of the protective envelope exceeding the nominal circumference of the bale, only by the width of the bonding area at the periphery, for example 20 cm. For a bale with an average diameter of 55 cm, it therefore results, instead of a length of the protective envelope largely exceeding 3 m, a length of only about 1.9 m, i.e. a saving of material around 40% on a protective envelope.

On connaît déjà, par le DOS 1 786 067, des matériaux fins et rigides, tels des matériaux de recouvrement de toitures, par exemple des cartons bitumés pour toitures qui sont enroulés en un rouleau compact, et entourés d'une enveloppe de protection de sorte que l'extrémité avant de la feuille de protection est disposée dans la balle à une certaine distance de l'extrémité extérieure du dernier tour du matériau à bobiner, et que la longueur de la feuille de protection dépasse la circonférence de la balle enveloppée seulement d'une valeur correspondant en gros à la largeur de la zone de collage à la périphérie entre l'extrémité arrière de la feuille de protection et le côté extérieur du tour de la feuille de protection qui se trouve en dessous. C'est ainsi que sont usuellement obtenus les rouleaux de carton bitumé, et conduits ainsi préparés à une machine de conditionnement qui sert à l'application de l'enveloppe de protection. L'extrémité avant de l'enveloppe de protection est garnie d'une bande de colle et introduite entre la balle de carton en rotation et le rouleau support inférieur, de sorte qu'on obtient une liaison par collage entre l'extrémité avant de la feuille de protection et la surface externe du carton essentiellement au niveau du côté de la balle opposé à celui de l'extrémité arrière du carton bitumé. Du fait de l'établissement rapide de la liaison par collage entre l'extrémité avant de la feuille de protection et la balle, une quantité supplémentaire de la feuille de protection est étirée à la suite de la rotation de la balle et est enroulée fortement tendue autour de la balle, jusqu'à ce que l'extrémité arrière de la feuille de protection recouvre l'extrémité avant et soit alors fixée également à l'aide d'une- colle.We already know, from DOS 1,786,067, fine and rigid materials, such as roofing materials, for example bituminous cardboard for roofs which are rolled up in a compact roll, and surrounded by a protective envelope so that the front end of the protective sheet is placed in the bale at a certain distance from the outer end of the last turn of the material to be wound, and that the length of the protective sheet exceeds the circumference of the wrapped bale only d 'A value roughly corresponding to the width of the bonding area at the periphery between the rear end of the protective sheet and the outer side of the turn of the protective sheet which is located below. This is how asphalt cardboard rolls are usually obtained, and pipes thus prepared to a packaging machine which is used for applying the protective envelope. The front end of the protective envelope is lined with a strip of glue and inserted between the rotating bale of cardboard and the lower support roller, so that a bond is obtained between the front end of the protective sheet and the outer surface of the carton essentially at the side of the bale opposite that of the rear end of the tarred cardboard. Due to the rapid establishment of the bonding bond between the front end of the protective sheet and the bale, an additional quantity of the protective sheet is stretched after the rotation of the bale and is wound tightly tensioned around the bale, until the rear end of the protective sheet covers the front end and is then also fixed with a glue.

Des contraintes technologiques différentes de celles rencontrées dans le conditionnement de rouleaux de feutres apparaissent dans le cas du conditionnement de matériaux incompressibles et relativement raides comme le carton bitumé pour toitures. Ces matériaux rigides peuvent être stockés et manipulés sous forme de rouleaux, tandis que le conditionnement de rouleaux de feutre n'est possible, économiquement, qu'au cours de l'étape de bobinage. Il serait sinon nécessaire de prendre des mesures supplémentaires pour éviter que les balles enroulées constituées d'un matériau à base de fibres minérales comprimées ne s'ouvrent sous l'effet de tensions internes. Selon l'invention, le conditionnement à l'aide d'une feuille de protection sert non seulement à former une protection externe, mais aussi à maintenir la forme enroulée de la balle.Technological constraints different from those encountered in the packaging of felt rolls appear in the case of the packaging of incompressible and relatively stiff materials such as roofing felt. These rigid materials can be stored and handled in the form of rolls, while the packaging of felt rolls is only possible, economically, during the winding step. Otherwise it would be necessary to take additional measures to prevent the coiled bales made of a material based on compressed mineral fibers from opening under the effect of internal tensions. According to the invention, the packaging using a protective sheet serves not only to form an external protection, but also to maintain the rolled shape of the bale.

Ainsi, on amène la feuille de protection dans la phase finale du bobinage de la balle en rotation de façon à ce que dans les conditions des techniques de production, il en résulte un entraînement assuré de l'extrémité avant de la feuille de protection, car on ne risque pas de coller la feuille de protection du fait de la tendance qu'a le revêtement du feutre de s'abimer.Thus, the protective sheet is brought into the final phase of winding the ball in rotation so that under the conditions of production techniques, this results in a guaranteed drive of the front end of the protective sheet, because there is no risk of sticking the protective sheet because of the tendency of the felt coating to be damaged.

De la solution connue, qui consiste simplement à coller l'extrémité avant de la feuille de protection exactement de la même façon que l'extrémité arrière, on ne peut donc pas remonter à l'invention. Sans un tel collage, et sans entraînement mécanique par le maintien de l'extrémité avant de la feuille de protection dans le dernier tour du tapis de fibres, il n'est pas évident de définir de quelle façon on peut communiquer à la feuille de protection la force d'entraînement de la balle en rotation rapide.From the known solution, which consists simply in gluing the front end of the protective sheet exactly in the same way as the rear end, we cannot therefore go back to the invention. Without such bonding, and without mechanical drive by maintaining the front end of the protective sheet in the last turn of the fiber mat, it is not obvious to define how one can communicate with the protective sheet. the driving force of the rapidly rotating ball.

Grâce à l'invention, on parvient à une solution tout à fait inattendue, à savoir que l'on peut obtenir un tel entraînement, en combinaison avec le frottement de la feuille de protection sur la surface externe de la balle, que de la sorte, sans l'intervention de colle, il se produit un effet d'adhérence de l'extrémité avant de la feuille de protection sur la surface extérieure fermée du revêtement, qui, d'une part, communique à la feuille de protection une force d'entraînement suffisante, et d'autre part, exclut tout risque de détérioration du revêtement lors du déballage.Thanks to the invention, a completely unexpected solution is reached, namely that such a drive can be obtained, in combination with the friction of the protective sheet on the external surface of the ball, that in this way , without the intervention of glue, there is an effect of adhesion of the front end of the protective sheet on the closed external surface of the covering, which, on the one hand, communicates to the protective sheet a force d 'sufficient training, and on the other hand, excludes any risk of damage to the coating during unpacking.

Les revendications 2 à 6 concernent des perfectionnements avantageux du procédé conforme à l'invention et ont particulièrement trait à des possibilités avantageuses, qui entraînent la liaison par adhérence de l'extrémité antérieure de la feuille de protection au contour extérieur nu, à surface fermée, de la balle enroulée, de façon telle que, lorsque l'utilisateur du matériau bobiné retire l'enveloppe de protection, il ne puisse produire aucune détérioration du revêtement du rouleau de feutre.Claims 2 to 6 relate to advantageous improvements to the process according to the invention and relate in particular to advantageous possibilities which entail the bonding by adhesion of the anterior end of the protective sheet to the naked external contour, with closed surface, of the wound ball, so that when the user of the wound material removes the protective cover, he cannot produce any deterioration of the coating of the felt roll.

Conformément à la revendication 6, l'eau à basse tension superficielle est particulièrement appropriée comme agent d'adhérence entre l'enveloppe de protection et le contour extérieur à surface fermée du rouleau de feutre. On peut aussi utiliser un hydrocarbure liquide. Dans le cas de l'eau, celle-ci se vaporise progressivement, et une huile, ou un produit analogue, rend possible lors du déballage par l'utilisateur le retrait de la feuille de prodection sans effort.In accordance with claim 6, water at low surface tension is particularly suitable as a bonding agent between the protective covering and the closed outer surface of the felt roll. It is also possible to use a liquid hydrocarbon. In the case of water, it gradually vaporizes, and an oil, or the like, makes it possible during unpacking by the user to remove the production sheet effortlessly.

Un dispositif particulièrement avantageux pour la mise en oeuvre du procédé conforme à l'invention est décrit dans la revendication 7; il dérive, dans sa conception générale, du brevet allemand 1 461 821. Les revendications 8 à 10 concernent des perfectionnements avantageux du dispositif conforme à l'invention.A particularly advantageous device for implementing the method according to the invention is described in claim 7; it derives, in its general design, from German patent 1 461 821. Claims 8 to 10 relate to advantageous improvements to the device according to the invention.

L'invention est exposée plus en détails ci-dessous, au moyen d'une mode d'exécution, représenté graphiquement, d'un dispositif pour la mise en oeuvre du procédé selon l'invention.The invention is described in more detail below, by means of an embodiment, represented graphically, of a device for implementing the method according to the invention.

La figure unique représente le schéma simplifié d'une vue latérale d'un dispositif conforme à l'invention.The single figure shows the simplified diagram of a side view of a device according to the invention.

Sur la figure, on désigne par 1 une bande continue pour le transport du tapis de fibres minérales 2 dont il est représenté sur la figure la zone terminale 3 constituée par une bande transporteuse séparée. Dans la position de fonctionnement représenté, dans un poste de bobinage 4, disposé à l'extrémité de la zone terminale 3, il a déjà été constitué un enroulement, ou une balle 5, du tapis de fibres 2, ainsi que cela est bien connu. A cet effet, la bordure avant du tapis de fibres 2, au cours de l'apport sur la bande de transport, parvient dans la zone d'un train de relevage 6, à l'extrémité de la bande transporteuse 1; elle y est déviée vers le haut (sur la figure), ainsi que cintrée suivant un arc de cercle, qui est repris par un dispositif 8 à rouleaux cardeurs, en mouvement de va-et- vient suivant la double flèche 7, et qui rebrousse sur la face dorsale de matériau bobiné 2. De cette façon, la totalité de la longueur d'une section découpée de matériau à bobiner 2 est enroulée en une balle 5, dont le diamètre moyen d, indique en trait mixte, pourrait avoir une valeur de 55 cm par exemple. En fonction de l'épaisseur du matériau à bobiner 2, l'extrémité arrière 2 de celui-ci fait saillie sur le diamètre moyen d et forme un gradin terminal de quelques centimètres de hauteur, selon l'épaisseur du matériau à bobiner qui vient d'être traité, par exemple sous la forme d'un rouleau de feutre sous bande de revêtement.In the figure, 1 denotes a continuous belt for the transport of the mineral fiber mat 2 of which the FIG. 3 represents the terminal zone constituted by a separate conveyor belt. In the operating position shown, in a winding station 4, disposed at the end of the terminal zone 3, a winding, or a bale 5, of the fiber mat 2 has already been formed, as is well known. . To this end, the front edge of the fiber mat 2, during the addition to the conveyor belt, reaches the region of a lifting train 6, at the end of the conveyor belt 1; it is deflected upwards there (in the figure), as well as bent along an arc of a circle, which is taken up by a device 8 with carding rollers, in reciprocating movement according to the double arrow 7, and which turns back on the dorsal face of wound material 2. In this way, the entire length of a cut section of material to be wound 2 is wound in a bale 5, the mean diameter of which, indicated in phantom, could have a value 55 cm for example. Depending on the thickness of the material to be wound 2, the rear end 2 thereof protrudes from the mean diameter d and forms a terminal step a few centimeters in height, depending on the thickness of the material to be wound which comes from be treated, for example in the form of a felt roll under a covering strip.

Une fois que la balle 5 est constituée de la façon habituelle précédemment exposée, elle doit alors être enveloppée, sur tout son pourtour, dans une enveloppe de protection 9, qui est maintenue à disposition sur une bande transporteuse 10, située au dessus de la bande transporteuse 1 du matériau à bobiner 2, et qui, après constitution d'une balle 5, est amenée par intermittence sur le contour extérieur de la balle en rotation 5. La mise en position de l'enveloppe de protection 9 se fait de façon usuelle à cette fin, à savoir que l'on fabrique des sections d'enveloppe de protection 9, provenant d'un rouleau d'approvisionnement, et que celles-ci sont transportées sur la bande transporteuse 10, en directon du poste de bobinage 4, jusqu'à ce que la bordure avant 9a de l'enveloppe de protection 9 qui, dans la position de travail représentée sur la figure, est appliquée déjà sur le contour extérieur de la balle 5, vienne au repos sur un emplacement 11 de la section avant terminale de la bande transporteuse 10. A cet effet, la bande transporteuse 10 peut être constituée de façon bien connue, d'une multiplicité de courroies relativement étroites, situées les unes à côté des autres, qui se déplacent sur des caissons aspirants 10a, lesquels peuvent créer une dépression dans l'espace entre courroies transporteuses voisines. S'il n'est appliqué aucune dépression, l'enveloppe de protection 9 repose sur les courroies transporteuses étroites et est entraînée par celles-ci. Aussitôt que la section d'enveloppe de protection 9 doit être stoppée, la dépression est mise in service et elle attire l'enveloppe de protection dans la zone comprise entre les courroies transporteuses qui continuent à se déplacer, sur la surface immobile des caissons 1 Oa, si bien que l'enveloppe de protection est prémunie contre un entraînement par les courroies transporteuses qui continuent à se déplacer. Comme on peut le voir sans plus d'explications, une telle commande usuelle, par dépression, de l'interruption du mouvement d'apport des sections d'enveloppe de protection 9, ne fournit en service sévère de production, qu'une définition approximative de la position de repos de la bordure avant 9a de l'enveloppe de protection 9, sur l'emplacement 11 prévu à cet effet sur la bande transporteuse 10, lorsque'on doit renoncer à des dépenses excessives pour la commande.Once the bale 5 is constituted in the usual manner previously exposed, it must then be wrapped, around its entire periphery, in a protective envelope 9, which is kept available on a conveyor belt 10, located above the band conveyor 1 of the material to be wound 2, and which, after constitution of a bale 5, is brought intermittently onto the outer contour of the rotating bale 5. The positioning of the protective casing 9 is carried out in the usual way for this purpose, namely that sections of protective casing 9 are produced, coming from a supply roller, and that these are transported on the conveyor belt 10, directly from the winding station 4, until the front edge 9a of the protective casing 9 which, in the working position shown in the figure, is already applied to the outer contour of the bale 5, comes to rest on a location 11 in the front end section of the conveyor belt 10. At this Indeed, the conveyor belt 10 can be made up in a well known manner, of a multiplicity of relatively narrow belts, located next to each other, which move on suction boxes 10a, which can create a depression in the space between neighboring conveyor belts. If no vacuum is applied, the protective envelope 9 rests on and is driven by the narrow conveyor belts. As soon as the protective casing section 9 must be stopped, the vacuum is put into service and it attracts the protective casing in the zone between the conveyor belts which continue to move, on the immobile surface of the casings 1 Oa , so that the protective cover is protected against entrainment by the conveyor belts which continue to move. As can be seen without further explanation, such a usual control, by vacuum, of the interruption of the movement of supply of the protective casing sections 9, provides in severe production service only an approximate definition. from the rest position of the front edge 9a of the protective casing 9, on the location 11 provided for this purpose on the conveyor belt 10, when excessive expenditure must be dispensed with for the order.

Lorsque l'extrémité arrière 2a du matériau à bobiner 2, après qu'a été complètement constituée pour la première fois la balle 5 défile pour la première fois devant la zone de sortie de la bande transporteuse 10 de l'enveloppe de protection 9, et s'en trouve à une certaine distance, la section d'enveloppe de protection 9 qui repose sur la bande transporteuse 10 est libérée par suite de l'interruption de la dépression dans les caissons aspirants 1 Oa, en sorte que l'enveloppe de protection 9, du fait du frottement sur les courroies transporteuses, est à nouveau entraînée et vient s'appliquer par son bord avant 9a sur le contour extérieur de la balle 5 du matériau à bobiner 2 déjà formée. Ici, de la façon qui sera expliquée encore plus en détail plus loin ci-dessous, il doit être créé un effet d'adhérence entre la surface extérieure nue, de la balle 5 et la surface de l'enveloppe de protection 9 qui s'applique sur la précédente, dans la zone de la bordure avant 9a de celle-ci, si bien que l'enveloppe de protection 9 est entraînée par la balle en rotation 5. La figure montre une position intermédiaire de ce mouvement d'entraînement, dans laquelle la bordure avant 9a de l'enveloppe de protection 9, après pression appliquée par le train de relevage 6, qui peut être lui aussi constitué d'une bande transporteuse, a été entraînée déjà sur plus d'un demi-tour de la balle 5 et se déplace en direction du dispositif au rouleaux cardeurs 8. A ce moment, l'extrémité arrière 9b, de la section d'enveloppe de protection 9, repose encore sur la bande transporteuse 10 et, du fait de la traction exercée par la balle en rotation 5 sur l'enveloppe de protection 9, éventuellement secondée par les courroies de la bande transporteuse 10, en déplacement plus lent, elle est entraînée et introduite dans le poste de bobinage 4. Auparavant, l'enveloppe de protection 9, dans la zone de sa bordure arrière 9b, a été recouverte de la façon habituelle d'une couche de colle, par exemple par apersion. La balle 5 continuant à tourner au-delà de la position présentée sur la figure, l'extrémité arrière 2a du matériau à bobiner 2 défile tout d'abord devant la zone de sortie de la bande transporteuse 10 de l'enveloppe de protection 9, tandis qu'une longueur importante de l'enveloppe de protection 9 repose encore sur la bande transporteuse 10 et est entraînée sous traction à partir de là. La balle 5 continuant à tourner au-delà de la position représentée, l'extrémité arrière 2a du matériau à bobiner, recouverte de l'enveloppe de protection 9, est alors pressée contre la bande transporteuse 1, sous le poids de la balle 5, ainsi que par les forces appliquées par le train de relevage 6 et par le dispositif à rouleaux cardeurs 8 et, en présence d'un matériau à bobiner convenablement déformable, elle est approximativement refoulée dans la zone comprise à l'intérieur de la ligne tracée en pointillé pour le diamètre nominal d, ainsi que recouverte alors sur sa face extérieure par l'enveloppe de protection 9. Ensuite la bordure avant 9b de l'enveloppe de protection 9 quitte la bande transporteuse 10 et est appliquée sur la face extérieure de la zone de la bordure avant 9a de l'enveloppe de protection 9 puis, la rotation se poursuivant, elle est pressée et collée par la pression de la bande 1 alimentant le matériau à bobiner.When the rear end 2a of the material to be wound 2, after the ball 5 has been completely formed for the first time, passes for the first time past the exit zone of the conveyor belt 10 from the protective casing 9, and is at a certain distance, the protective casing section 9 which rests on the conveyor belt 10 is released as a result of the interruption of the vacuum in the suction boxes 1 Oa, so that the protective casing 9, due to the friction on the conveyor belts, is again driven and is applied by its front edge 9a on the outer contour of the bale 5 of the material to be wound 2 already formed. Here, as will be explained in more detail below, an adhesion effect must be created between the bare outer surface of the ball 5 and the surface of the protective envelope 9 which applies to the previous one, in the area of the front edge 9a thereof, so that the protective casing 9 is driven by the rotating ball 5. The figure shows an intermediate position of this driving movement, in which the front edge 9a of the protective casing 9, after pressure applied by the lifting train 6, which can also consist of a conveyor belt, has already been driven over more than half a turn of the bale 5 and moves in the direction of the carding roller device 8. At this time, the rear end 9b of the protective casing section 9 still rests on the conveyor belt 10 and, due to the traction exerted by the rotating ball 5 on the protective casing 9, possibly seconded p ar belts of the conveyor belt 10, in slower movement, it is driven and introduced into the winding station 4. Previously, the protective casing 9, in the area of its rear edge 9b, was covered in the way usual with a layer of glue, for example by apersion. As the ball 5 continues to rotate beyond the position shown in the figure, the rear end 2a of the material to be wound 2 passes first of all past the exit zone of the conveyor belt 10 from the protective casing 9, while a significant length of the protective envelope 9 still rests on the conveyor belt 10 and is driven under traction from there. The ball 5 continuing to rotate beyond the position shown, the rear end 2a of the material to be wound, covered with the protective envelope 9, is then pressed against the conveyor belt 1, under the weight of the ball 5, as well as by the forces applied by the lifting gear 6 and by the carding roller device 8 and, in the presence of a suitably deformable winding material, it is roughly forced back into the zone inside the line drawn in dotted line for the nominal diameter d, as well as then covered on its external face by the protective envelope 9. Then the front edge 9b of the protective envelope 9 leaves the conveyor belt 10 and is applied to the external face of the zone of the front edge 9a of the protective envelope 9 then, the rotation continuing, it is pressed and bonded by the pressure of the strip 1 supplying the material to be wound.

La zone de collage réalisée sur la face extérieure du domaine de la bordure avant 9a de l'enveloppe de protection 9, entre la face extérieure du domaine de la bordure avant 9a et la face intérieure du domaine de la bordure arrière 9b de l'enveloppe de protection 9, se situe à distance notable de l'extrémité arrière débordante 2a du matériau à bobiner et, en conséquence, elle est dans une très large mesure soustraite à l'influence de celle-ci. Pour autant que des efforts sont appliqués dans la zone de collage, par réaction élastique de l'extrémité arrière 2a, il s'agit exclusivement d'efforts de cisaillement, qui peuvent être facilement absorbés par le collage; des effrots d'écartement, qui tendraient à séparer les unes des autres les deux parties de l'enveloppe de protection collées en superposition, n'apparaisisent en aucun cas. En outre, il est particulièrement avantageux que l'extrémité arrière 2a du matériau à bobiner 2 soit recouverte par l'enveloppe de protection 9 à un moment où une longue partie de l'enveloppe de protection 9 est encore appliquée sur la bande transporteuse 10 et y est retenue par frottement, lequel peut même éventuellement être accru par l'instauration d'une légère dépression dans les caissons aspirants 10a, si bien que l'enveloppe de protection 9 sursollicités sévèrement, sous contrainte de traction notable, l'extrémité arrière 2a du matériau à bobiner 2, et la bloque ainsi, après soulèvement de l'extrémité arrière 2a à partir du plan de la bande transporteuse 1. De ce fait, le contour extérieur de la balle 5 terminée, enveloppé dans l'enveloppe de protection 9, est mieux adapté au contour nominal idéal, même dans le domaine de l'extrémité arrière débordante 2a, ce qui, non seulement améliore l'aspect visuel, mais aussi, grâce à une possibilité de roulage améliorée, à une possibilité de stockage intacte, etc. facilite aussi la manutention ultérieure du produit fini.The bonding area produced on the outer face of the area of the front edge 9a of the protective envelope 9, between the outer face of the area of the front edge 9a and the inner face of the area of the rear edge 9b of the envelope protection 9, is located at a significant distance from the protruding rear end 2a of the material to be wound and, consequently, it is to a large extent removed from the influence of the latter. As far as forces are applied in the bonding zone, by elastic reaction of the rear end 2a, these are exclusively shearing forces, which can be easily absorbed by bonding; spacers, which would tend to separate from one another the two parts of the protective envelope bonded in superposition, do not appear in any case. In addition, it is particularly advantageous that the rear end 2a of the material to be wound 2 is covered by the protective envelope 9 at a time when a long part of the protective envelope 9 is still applied to the conveyor belt 10 and is retained there by friction, which can even possibly be increased by the establishment of a slight depression in the suction boxes 10a, so that the protective casing 9 severely stressed, under notable tensile stress, the rear end 2a of the material to be wound 2, and thus blocks it, after lifting the rear end 2a from the plane of the conveyor belt 1. Therefore, the outer contour of the bale 5 finished, wrapped in the protective envelope 9 , is better suited to the ideal nominal contour, even in the area of the protruding rear end 2a, which not only improves the visual appearance, but also, thanks to an improved rolling possibility, to a possibility of e intact storage, etc. also facilitates subsequent handling of the finished product.

En outre, comme on peut le voir sans autres explications, la seule longueur nécessaire pour l'enveloppe de protection 9 est celle qui fournit un recouvrement suffisant dans le domaine de la bordure avant 9a et de la bordure arrière 9b située au dessus, en sorte que la longueur de l'enveloppe de protection 9 sur le contour extérieur de la balle 5 a uniquement besoin de correspondre à la longueur du contour, plus le recouvrement (de 20 cm par exemple) nécessaire pour le collage. Ici, en outre, tombent les exigences spéciales consernant la précision de la commande d'avance de l'enveloppe de protection 9, ou bien, en cas de commande imprécise de l'avance de l'enveloppe de protection 9, ne sont nullement nécessaires des compensations au moyen de surlon- gueurs de l'enveloppe de protection 9; en effet, il est parfaitement suffisant que la bordure avant 9a de l'enveloppe de protection vienne se situer à un écartement de quelques décimètres (dans l'exemple considéré) en avant ou en arrière de l'extrémité arrière 2a du matériau à bobiner 2, sans qu'il importe de rigoureusement respecter une position déterminée. Dans l'exemple présenté, la bordure avant 9a de l'enveloppe de protection 9 a été appliquée relativement tôt sur la balle 5 et se situe donc à une distance relativement faible en arrière de l'extrémité arrière 2a du matériau à bobiner 2. Aussi bien, la bordure avant 9a de l'enveloppe de protection, dans la position angulaire représentée de la balle 5, pourrait cependant se situer n'importe où sur la balle 5, dans le domaine compris entre les surfaces d'application de la bande transporteuse 1 et du train de relevage 6, sans que cela en vienne à engendrer quelques perturbations, ou même simplement des modifications notables des conditions d'emballage. Grâce à la prescription d'une longueur déterminée de la section utilisée de l'enveloppe de protection 9, la bordure arrière 9b de l'enveloppe de protection 9, après un tour complet, vient automatiquement se placer sur la surface extérieure de la bordure avant 9a, des modifications dans la position de la bordure avant sur le contour de la balle entraînant uniquement une modification correspondante de la position de l'emplacement de collage, sans modifications perturbatrices des conditions de travail.In addition, as can be seen without further explanation, the only length necessary for the protective envelope 9 is that which provides sufficient overlap in the area of the front edge 9a and the rear edge 9b located above, so that the length of the protective envelope 9 on the outer contour of the ball 5 only needs to correspond to the length of the contour, plus the overlap (of 20 cm for example) necessary for bonding. Here, moreover, fall the special requirements concerning the precision of the advance control of the protective envelope 9, or else, in the event of imprecise control of the advance of the protective envelope 9, are in no way necessary compensations by means of highlighters of the protective envelope 9; in fact, it is perfectly sufficient for the front edge 9a of the protective envelope to come to be spaced a few decimeters apart (in the example considered) in front of or behind the rear end 2a of the material to be wound 2 , without having to strictly respect a specific position. In the example presented, the front edge 9a of the protective envelope 9 was applied relatively early on the bale 5 and is therefore located at a relatively short distance behind the rear end 2a of the material to be wound 2. Also well, the front edge 9a of the protective envelope, in the angular position shown of the bale 5, could however be located anywhere on the bale 5, in the range between the application surfaces of the conveyor belt 1 and the lifting gear 6, without this causing some disturbances, or even simply significant changes in the packaging conditions. Thanks to the prescription of a determined length of the section used of the protective envelope 9, the rear edge 9b of the protective envelope 9, after a complete revolution, is automatically placed on the outer surface of the front edge 9a, changes in the position of the front edge on the contour of the ball resulting only in a corresponding change in the position of the bonding location, without disturbing changes in working conditions.

Dans le domaine d'extrémité 3 de la bande transporteuse 1 du matériau à bobiner dans le cas du traitement d'une feutre sous bande de revêtement, il est d'usage de travailler avec des courroies transporteuses distantes les unes des autres, qui avancent au-dessus d'un caisson aspirant équipé d'orifices de succion. En raison de la succion de l'air introduit dans le caisson aspirant 1 a à travers les orifices de succion, la bande du matériau à bobiner est pressée plus fortement contre les courroies transporteuses, et son effet d'entraînement est ainsi accru par frottement, en sorte que la bande du matériau à bobiner 2 est introduite en conséquence impeccablement dans le poste de bobinage 4 et peut y être transformée en rouleau ou en balle 5.In the end region 3 of the conveyor belt 1 of the material to be wound up in the case of the treatment of a felt under a covering strip, it is customary to work with conveyor belts spaced from each other, which advance at - above a suction box fitted with suction ports. Due to the suction of the air introduced into the suction box 1a through the suction orifices, the strip of the material to be wound is pressed more strongly against the conveyor belts, and its driving effect is thus increased by friction, so that the strip of material to be wound 2 is introduced accordingly impeccably into the winding station 4 and can be transformed therein into a roll or bale 5.

Pour seconder l'effet d'adhérence de la bordure avant 9a de l'enveloppe de protection 9 sur le contour extérieur de la balle 5, il est prévu, conformément à l'invention, de disposer, dans le domaine de la surface d'appui de la balle 5 sur la bande transporteuse 1, au lieu d'un caisson aspirant pneumatique 1 a, une boîte à air comprimé 1 b, et de prévoir également, dans le domaine de la bande transporteuse de relevage 6, une boîte à air comprimé 6b, avec des orifices de soufflage, non représentés plus en détail, traversant les bandes transporteuses. Les boîtes à air comprimé 1 b et 6b peuvent être exploitées avec une pression d'alimentation de 400 à 500 mm d'eau environ et, moyennant une disposition et un dimensionnement appropriés des orifices de soufflage, elles provoquent par écoulement d'air une pression complémentaire de la bordure avant 9a de l'enveloppe de protection 9 sur le contour extérieur de la bande 5 sur la bande transporteuse 1 ou sur la bande de relevage 6. Il s'est avéré que jusqu'à des vitesses du matériau à bobiner 2 sur la bande transporteuse 1 de l'ordre de 80 m/mn, on peut renoncer sans problème à une telle assistance par boîtes à air comprimé, 1 b ou 6b. Cependant, pour des vitesses d'alimentation plus élevées, qui peuvent aller jusqu'à 140 m/mn, ou même d'avantage, l'assitance par air comprimé qu'on vient de décrire peut être de grande valeur.To assist the adhesion effect of the front edge 9a of the protective envelope 9 on the outer contour of the ball 5, provision is made, in accordance with the invention, in the area of the surface for support of the bale 5 on the conveyor belt 1, instead of a pneumatic suction box 1 a, a compressed air box 1 b, and also to provide, in the field of the lifting conveyor belt 6, an air box compressed 6b, with blowing orifices, not shown in more detail, passing through the conveyor belts. The compressed air boxes 1b and 6b can be operated with a supply pressure of 400 to 500 mm of water approximately and, by means of an appropriate arrangement and dimensioning of the blowing orifices, they cause by air flow a pressure complementary to the front edge 9a of the protective envelope 9 on the outer contour of the belt 5 on the conveyor belt 1 or on the lifting belt 6. It has been found that up to speeds of the material to be wound 2 on the conveyor belt 1 of the order of 80 m / min, such assistance by compressed air boxes, 1b or 6b, can be dispensed with without problem. However, for higher feeding speeds, which can go up to 140 m / min, or even more, the assistance by compressed air which has just been described can be of great value.

L'effet d'adhérence de la bordure avant 9a de l'enveloppe de protection 9 sur le contour extérieur nu, à surface continue, de la balle 5 peut être obtenue de différentes façons. En particulier, lorsqu'on utilise une feuille de plastique comme enveloppe de protection 9, l'enveloppe de protection 9 peut être chargée électrostatiquement, d'une manière bien connue, qui n'est pas représentée plus en détail, et adhérer sous l'effet de cette charge. Ici, l'effet d'adhérence dû à la charge n'a en aucune façon besoin d'être limité à la bordure avant 9a de l'enveloppe de protection 9, mais peut accroître, sur toute sa surface, l'entraînement par frottement de l'enveloppe de protection 9 sur le contour extérieur de la balle en rotation 5. La condition préalable à une telle charge électrostatique, soit de l'enveloppe de protection 9, soit de la surface du contour extérieur de la balle 5, est cependant un choix convenable du matériau, si bien qu'une adhérence par charge électrostatique ne peut être obtenue dans tous les cas.The adhesion effect of the front edge 9a of the protective casing 9 on the bare, continuous surface exterior contour of the ball 5 can be obtained in different ways. In particular, when a plastic sheet is used as a protective envelope 9, the protective envelope 9 can be electrostatically charged, in a well known manner, which is not shown in more detail, and adhere under the effect of this charge. Here, the adhesion effect due to the load need not in any way be limited to the front edge 9a of the protective casing 9, but may increase, over its entire surface, the friction drive. of the protective casing 9 on the outer contour of the rotating ball 5. The precondition for such an electrostatic charge, either of the protective casing 9, or of the surface of the outer contour of the ball 5, is however a suitable choice of material, so that adhesion by electrostatic charge cannot be obtained in all cases.

C'est pourquoi il peut être prévu, éventuellement à titre de complément, en particulier dans le domaine de la bordure avant 9a de l'enveloppe de protection 9, d'appliquer sur celle-ci un adjuvant de collage. Un tel adjuvant de collage, à la différence de la colle qui peut être appliquée en même temps dans le domaine de la bordure arrière 9b de l'enveloppe de protection 9, ne doit cependant créer aucun assemblage collé durable ou phénomène analogue, mais seulement une adhérence au cours de l'enveloppement qui, ou bien doit avoir disparu au plus tard lors de l'enlèvement de l'enveloppe de protection 9 par l'utilisateur du matériau bobiné 2, ou bien doit être constituée dès le départ de façon telle que son élimination soit possible sans problème sans détérioration de la surface extérieure de la balle 5.This is why it can be provided, optionally as a supplement, in particular in the field of the front edge 9a of the protective envelope 9, to apply to it a bonding aid. Such a bonding aid, unlike the adhesive which can be applied at the same time in the area of the rear edge 9b of the protective casing 9, must however not create any durable bonded assembly or similar phenomenon, but only one adhesion during wrapping which either must have disappeared at the latest when the protective covering 9 is removed by the user of the wound material 2, or else must be formed from the start in such a way that its elimination is possible without problem without deterioration of the external surface of the ball 5.

Ainsi, comme adjuvant de collage, on peut, à titre d'exemple, envisager un matériau dont l'effet d'adhérence peut être supprimé par un effet de pelage (dit de «peel-off»), ainsi qu'il est d'usage avec ce qu'on appelle les scellements adhésifs.Thus, as a bonding aid, it is possible, by way of example, to envisage a material whose adhesion effect can be eliminated by a peeling effect (known as “peel-off”), as it is d for use with so-called adhesive seals.

Cependant, une utilisation des adjuvants de collage usuels dans les scellements adhésifs, d'une part, est relativement coûteuse et, d'autre part, n'exclut pas complètement des détériorations du fait de l'utilisateur, dans le cas d'un enlèvement incorrect de l'enveloppe de protection 9. C'est pourquoi on préfère, comme adjuvant de collage, un liquide qui, dans le domaine de la bordure avant 9a de l'enveloppe de protection 9, produit un film liquide, pour l'essentiel continu, qui atteint l'effet d'adhérence désiré grâce à des forces d'adhérence physique ainsi que grâce à des forces internes de cohésion. A cet effet, on peut en principe envisager toute une série de liquides mouillants, parmi lesquels figurent en particulier des hydrocarbures liquides. Il est particulièrement avantageux de choisir ici un liquide qui, en particulier sans dispositions complémentaires, s'évapore pour l'essentiel sans résidu, par exemple des liquides à base d'alcools volatils, d'éthers ou de corps analogues.However, the use of the usual bonding aids in adhesive seals, on the one hand, is relatively expensive and, on the other hand, does not completely exclude deterioration caused by the user, in the case of removal. incorrect protective covering 9. This is why, as a bonding aid, a liquid is preferred which, in the area of the front edge 9a of the protective covering 9, produces a liquid film, essentially continuous, which achieves the desired adhesion effect thanks to physical adhesion forces as well as internal cohesion forces. For this purpose, it is in principle possible to envisage a whole series of wetting liquids, among which are in particular liquid hydrocarbons. It is particularly advantageous here to choose a liquid which, in particular without additional provisions, evaporates essentially without residue, for example liquids based on volatile alcohols, ethers or the like.

Dans le cas de l'exemple, on utilise, comme adjuvant de collage, de l'eau à basse tension superficielle. L'eau à basse tension superficielle est un liquide mouillant bien, qui forme un film continu et par conséquent assure un bon effet d'adhérence. A la suite de l'enveloppement, l'eau, introduite du reste en faible quantité, s'évacue très simplement par séchage et s'évapore de cette façon, si bien que, lors de l'enlèvement de l'enveloppe de protection 9 par l'utilisateur, son extrémité avant 9a est appliquée simplement, sans aucun effet d'adhérence ou autre liaison, sur le contour extérieur de la balle 5, et se détache de celui-ci après dissociation de l'assemblage collé. Par ailleurs, l'eau à basse tension superficielle est bon marché, facile à manipuler et à traiter.In the case of the example, water with low surface tension is used as the bonding aid. Water at low surface tension is a good wetting liquid, which forms a continuous film and therefore provides a good adhesion effect. Following the wrapping, the water, which is introduced in small quantities, is evacuated very simply by drying and evaporates in this way, so that when the protective envelope is removed 9 by the user, its front end 9a is applied simply, without any effect of adhesion or other connection, on the outer contour of the ball 5, and is detached from the latter after dissociation of the bonded assembly. In addition, low surface tension water is inexpensive, easy to handle and treat.

Pour introduire le liquide utilisé comme adjuvant de collage donc l'eau à basse tension superficielle dans le cas de l'exemple, il est prévu, comme dispositif d'alimentation 12, une éponge 13, qui est fixée sur une rampe pivotante 14 et qui est imprégnée, d'une façon non représentée plus en détail, avec le liquide constituant l'adjuvant de collage. La rampe pivotante 14 est disposée, dans le sens d'alimentation de l'enveloppe de protection 9, juste avant l'emplacement d'arrêt 11 pour la bordure avant 9a de l'enveloppe de protection 9; elle peut s'abbaisser sur la surface de la bande transporteuse 10 et se soulever à nouveau de celle-ci, suivant la double flèche 15; elle est également mobile, d'une façon non représentée plus en détail, normalement au plan de la figure, le long de la bordure avant 9a de l'enveloppe de protection 9. En cas de nécessité, à ce mouvement perpendiculaire au plan de la figure peut être superposée aussi une composante dans le plan de la figure, le cas échéant dans la direction de l'arête de la bordure avant 9a de l'enveloppe de protection 9, a fin de mouiller complètement celle-ci et d'interdire, en toutes circonstances, un coulèvement de l'arête avant de la bordure 9a de l'enveloppe de protection 9. Dans tous les cas, l'éponge 13 exécute ainsi, sur la face supérieure de l'enveloppe de protection 9, dans la zone de sa bordure avant 9a, un mouvement de balayage, qui garantit l'apport approprié d'un film liquide continu.To supply the liquid used as a bonding aid, therefore water at low surface tension in the case of the example, there is provided, as a supply device 12, a sponge 13, which is fixed on a pivoting ramp 14 and which is impregnated, in a manner not shown in more detail, with the liquid constituting the bonding aid. The pivoting ramp 14 is arranged, in the direction of supply of the protective envelope 9, just before the stop location 11 for the front edge 9a of the protective envelope 9; it can be lowered on the surface of the conveyor belt 10 and lift again from it, according to the double arrow 15; it is also movable, in a manner not shown in more detail, normally in the plane of the figure, along the front edge 9a of the protective envelope 9. If necessary, to this movement perpendicular to the plane of the Figure can also be superimposed on a component in the plane of the figure, if necessary in the direction of the edge of the front edge 9a of the protective casing 9, in order to completely wet it and to prohibit, in all circumstances, a raising of the front edge of the edge 9a of the protective envelope 9. In all cases, the sponge 13 thus performs, on the upper face of the protective envelope 9, in the zone from its front edge 9a, a sweeping movement, which guarantees the appropriate supply of a continuous liquid film.

Avec une zone ainsi mouillée de la bordure avant 9a, l'enveloppe de protection 9, par suppression de la dépression dans les caissons aspirants (1 Oa arrive à la surface périphérique nue de la balle 5, à une distance aussi grande que possible de l'extrémité arrière 2a du matériau à bobiner 2, y adhère et est entraînée, en passant par la position intermédiaire représentée, jusqu'à ce que la bordure arrière 9b de l'enveloppe de protection 9 recouvre la bordure avant entraînée 9a et s'y colle. De cette façon, il peut être réalisé des balles enveloppées de façon complète sur tout le pourtour, avec une surface périphérique bien ronde, moyennant une faible consommation de matière pour l'enveloppe de protection 9, en une succession rapide, si bien que, selon la vitesse d'apport du matériau à bobiner 2 sur la bande transporteuse, il est possible de fabriquer des balles tout emballées avec des temps unitaires inférieurs à 10 secondes, dans les meilleures conditions possibles de sécurité de production.With a zone thus wetted from the front edge 9a, the protective envelope 9, by removing the vacuum in the suction boxes (1 Oa arrives at the bare peripheral surface of the ball 5, at a distance as large as possible from the rear end 2a of the material to be wound 2, adheres to it and is driven, passing through the intermediate position shown, until the rear edge 9b of the protective casing 9 covers the driven front edge 9a and there In this way, it is possible to produce balls completely wrapped around the entire periphery, with a well-rounded peripheral surface, with low consumption of material for the protective envelope 9, in rapid succession, so that , depending on the speed of supply of the material to be wound 2 on the conveyor belt, it is possible to manufacture all-wrapped bales with unit times less than 10 seconds, under the best possible conditions of product safety ction.

Claims (10)

1. Method of wrapping a rotating bale (8) constituted by a mat of mineral fibres (2) in the form of a roll of felt provided with a covering strip, the outer surface of which is closed, in a protective wrapping (9) deposited while the bale (5) is being rolled, with a view to packaging the bale, wherein the protective wrapping (9) covered with a coating of glue at its rear end (9b) and having a length greater than the perimeter of the bale is carried by its front end (9a) into the,peripheral zone of the rotating bale (5) and is attached thereto without the use of a glue, resulting in a durable connection, following which, after suitable rotation of the bale, the rear end of the protective wrapping (9) is pressed against the outer face of the subjacent turn of the protective wrapping in order to obtain a durable gluing, characterized in that the entraining connection which ensures transmission of stresses between the front end (9a) of the protective wrapping (9) and the bale (5) is created exclusively by the effect of adhesion between the inner surface of the protective wrapping (9) which is turned towards the bale and the bare outer surface of the covering strip, in that the front end (9a) of the protective wrapping (9) is applied to the bale (5) at a distance from and preferably to the rear of the outer end of the last turn of the roll of felt and in that the length of the protective wrapping (9) exceeds the circumference of the wrapped bale, in principle only by the peripheral width of the area of gluing between the rear end of the protective wrapping and the outer face of the subjacent turn of the protective wrapping (9).
2. Method according to Claim 1, characterized in that in order to obtain the effect of adhesion between the inner surface of the front end (9a) of the protective wrapping (9) and the outer surface of the front end of the protective wrapping and the bare outer surface of the covering strip an electrostatic charge is created on the protective wrapping and/or on the surface of the bale.
3. Method according to one of Claims 1 or 2, characterized in that in order to obtain the effect of adhesion between the inner surface of the front end (9a) of the protective wrapping (9) and the bare outer surface of the covering strip, an adhesive agent is conveyed to the inner surface of the front end of the protective wrapping and/or on the bare outer surface of the covering strip, preferably however on the inside face of the front end of the protective wrapping.
4. 4. Method according to Claim 3, characterized in that as an adhesive agent, a liquid is used which forms an essentially continuous film.
5. Method according to one of Claims 3 or 4, characterized in that as an adhesive agent a liquid is used which evaporates essentially without residue.
6. Method according to Claims 4 or 5, characterized in that as an adhesive agent water with a low surface tension or a liquid hydrocarbon is used.
7. Apparatus for carrying out the method according to one of Claims 3 to 6, comprising a conveyor belt (1) for the coated mat of mineral fibres (2), a winding station (4) for the fibre mat and a conveyor belt for the protective wrapping (9), with one end zone directed towards the surface of the formed bale, the sections of protective wrapping (9) cut to the required length and covered with a layer of glue at the rear ends may be carried to the winding station intermittently and in synchronism with the forward movement of the fibre mat, characterized in that above the end zone of the conveyor belt (10) for the protective wrapping (9) there is an apparatus (12) for depositing an adhesive agent, which does not produce a durable liaison, on the front end (9a) of the protective wrapping (9), which is periodically at rest there.
8. Apparatus according to Claim 7, characterized in that the depositing means (12) provided for the application of a wetting liquid as an adhesive agent comprises a sponge (13) which can be caused to perform a sweeping movement over the surface of the protective wrapping (9) in the zone of the front end (9a) thereof.
9. Apparatus according to one of Claims 7 or 8, characterized in that in the field of the end (3) of the conveyor belt (1) for the fibre mat (2) there is a blower device (compresses air container 1 b) adapted to subject the surface of the adjacent bale to the effects of compressed air.
10. Apparatus according to one of Claims 7 to 9 in which the winding station (4) at the end of the conveyor belt (1) for the fibre mat (2) has a lifting train (6) disposed at an acute angle and adapted to entrain the front end of the fibre mat (2) upwardly at the start of formation of the roll (5), characterized in that in the zone where the lifting train (6) is located, there is a blower device (compressed air container 6b) adapted to subject the surface of the adjacent bale to the effects of compressed air.
EP84400810A 1983-04-20 1984-04-20 Method and apparatus for wrapping a roll of fibres in a protective wrap Expired EP0131475B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84400810T ATE24160T1 (en) 1983-04-20 1984-04-20 METHOD AND DEVICE FOR WRAPPING A BALL OF FIBER WITH A PROTECTIVE SLEEVING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3314289A DE3314289C2 (en) 1983-04-20 1983-04-20 Method for wrapping a rotating bale of wrapping material, in particular of a laminated mineral fibre web, with a protective web for packaging, and device for carrying out the method
DE3314289 1983-04-20

Publications (2)

Publication Number Publication Date
EP0131475A1 EP0131475A1 (en) 1985-01-16
EP0131475B1 true EP0131475B1 (en) 1986-12-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400810A Expired EP0131475B1 (en) 1983-04-20 1984-04-20 Method and apparatus for wrapping a roll of fibres in a protective wrap

Country Status (15)

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US (1) US4608807A (en)
EP (1) EP0131475B1 (en)
JP (1) JPS59221211A (en)
KR (1) KR930006464B1 (en)
AT (1) ATE24160T1 (en)
AU (1) AU568128B2 (en)
BR (1) BR8401834A (en)
CA (1) CA1294527C (en)
DE (2) DE3314289C2 (en)
DK (1) DK156210C (en)
ES (1) ES531598A0 (en)
FI (1) FI76978C (en)
NO (1) NO166699C (en)
TR (1) TR22457A (en)
ZA (1) ZA843018B (en)

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Also Published As

Publication number Publication date
BR8401834A (en) 1984-11-27
KR930006464B1 (en) 1993-07-16
DK156210B (en) 1989-07-10
AU568128B2 (en) 1987-12-17
FI841557A0 (en) 1984-04-18
DE3461620D1 (en) 1987-01-22
ES8500840A1 (en) 1984-12-01
TR22457A (en) 1987-07-13
CA1294527C (en) 1992-01-21
ZA843018B (en) 1985-02-27
ATE24160T1 (en) 1986-12-15
EP0131475A1 (en) 1985-01-16
AU2702684A (en) 1984-10-25
US4608807A (en) 1986-09-02
DK193384A (en) 1984-10-21
FI841557A (en) 1984-10-21
DE3314289C2 (en) 1987-01-02
DK156210C (en) 1989-11-27
DK193384D0 (en) 1984-04-13
KR850000340A (en) 1985-02-26
ES531598A0 (en) 1984-12-01
JPS59221211A (en) 1984-12-12
DE3314289A1 (en) 1984-10-25
FI76978B (en) 1988-09-30
FI76978C (en) 1989-01-10
NO166699B (en) 1991-05-21
NO841528L (en) 1984-10-22
NO166699C (en) 1991-08-28

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