DE2736099B1

DE2736099B1 - Continuously working press

Info

Publication number: DE2736099B1
Application number: DE19772736099
Authority: DE
Inventors: Mets Albert De
Original assignee: METS KONSTRUKT; Constructiewerkhuizen de Mets NV
Current assignee: METS KONSTRUKT; Constructiewerkhuizen de Mets NV
Priority date: 1977-08-10
Filing date: 1977-08-10
Publication date: 1978-11-16
Also published as: DE2736099C2

Description

Beim Arbeiten mit dieser Presse sind insbesondere dann Schwierigkeiten aufgetreten, wenn diese aus irgendeinem Grunde stillgesetzt wurde, denn der von den die Hochdruckzone bildenden Walzen beeinflußte Vliesteil wurde praktisch linienförmig beeinflußt und diese unterschiedliche Dichte des Vlieses führte beim Wiederanlaufen der Presse zur Rißbildung, insbesondere bei der Herstellung dicker Platten Der Erfindung liegt die Aufgabe zugrunde, die bekannte Presse nach dem Zusatzpatent so witerzuentwickeln, daß eine Bildung von Rissen in dem die Hochdruckzone verlassenden Vliesteil insbesondere beim Wiederanlaufen der Presse und bei der Herstellung dickerer Platten vermieden werden kamL Erfindunpgemiß wird zunächst vorgeschlagen, eine dritte Umlenkwalze für jedes Polyamid-Endloßbsnd vorzusehen, die - in der Bewegungsrichtung des jeweiligen Polyamid-Endlosbandes gesehen - hinter den die Hochdruckzone bildenden Walzen angeordnet ist, die dritten Umlenkwalzen einander gegenüberliegend anzuordnen und den Abstand der Drehachsen dieser dritten Umlenkwalzen voneinander derart zu bemessen, daß der Spalt zwischen den Endlos-Stahlbandern im Bereich der dritten Umlenkwalzen genauso groß ist wie im Bereich der die Hochdruckzone bildenden Walzen Erreicht wird dadurch, daß das durch die die Hochdruckzone bildenden Walzen verdichtete Vlies erst verzögert zurückfedern kann, was besonders beim Herstellen von dickeren Platten zwecks Vermeidung von Rissen von großer Bedeutung ist Diese Risse konnten, nachdem je eine dritte Umlenkwalze hinter den die Hochdruckzone bildenden Walzen vorgesehen worden war, auch beim erneuten Anlaufen der Presse vermieden werden Man kann nun noch einen Schritt weitergehen, wenn man mehr als drei Walzen jedem Polyamid-Endlosband zuordnet und dafür sorgt, daß die Lange jedes Polyamid-Endlosbandes größer als die Umfangslänge jeder der Endlos-Plattenbãnder und kleiner ist als die Länge des entsprechenden äußeren Endlos-Stahlbandes Dadurch wird ein gleichmäßigeres Vlies bzw. eine gleichmäßigere Plattenbahn erzielt, weil die die Endlos-Plattenbänder umfassenden Polyamid-Endlosbänder den von den Endlos-Plattenbändern und den Andruckwalzen ausgeübten Druck über äußere Flächen verteilen Außerdem wird auch das Zurückledern des Vlieses im Bereich zwischen den Endlos-Plattenbändern und den dann folgenden Walzen verhindert Die Erfindung wird anhand zweier in den Zeichnungen schematisch dargestellter Ausfahrungsbeispiele nachstehend weiter erläutert Es zeigt Fig 1 den Auslaßteil einer kontinuierlich arbeitenden Presse mit Endlos-Plattenbändern, den die Hochdruckzone bildenden Walzen und den Polyamid-Endlosbändern, die über je drei Umlenkwalzen geführt sind F i g. 2 den Auslaßteil einer kontinuierlich arbeitenden Presse, bei der die Polyamid-Endlosbänder, die die die Hochdruckzone bildenden Walzen umfassen, auch um die Endlos-Plattenbãnder herumgeführt sind In den F i g. 1 und 2 ist jeweils lediglich die Niederdruckzone einer kontinuierlich arbeitenden Presse durch die übereinander angeordneten Endlos-Plattenbänder 3 und 4, die je von einem Endlos-Stahlband 48 bzw. 47 umfaßt sind, angedeutet, wobei im Auslaßbereich der Presse die beiden, die Hochdruckzone bildenden Walzen 36 und 37 in den von den Endlos-Stahlbändern 48 und 47 umfaßten Räumen angeordnet sind. When working with this press there are then difficulties in particular occurred when it was shut down for any reason, because that of the part of the non-woven fabric influenced by the rollers forming the high pressure zone became practically linear influenced and this different density of the fleece resulted in restarting the press for cracking, especially when making thick panels of the invention is based on the task of developing the well-known press according to the additional patent in such a way that that a formation of cracks in the fleece part leaving the high pressure zone in particular avoided when restarting the press and when producing thicker panels According to the invention, a third deflection roller is first proposed to provide for each polyamide Endloßbsnd the - in the direction of movement of the respective Polyamide endless belt seen - arranged behind the rollers forming the high pressure zone is, to arrange the third guide rollers opposite one another and the distance between the Axes of rotation of these third deflecting rollers are to be dimensioned from one another in such a way that the gap just as large between the endless steel belts in the area of the third deflection rollers is how it is achieved in the area of the rollers forming the high pressure zone, that the compacted fleece by the rollers forming the high pressure zone is only delayed can spring back, which is especially important when making thicker panels in order to avoid them of cracks is of great importance These cracks could, after a third one Deflection roller was provided behind the rollers forming the high pressure zone, can also be avoided when the press starts up again. You can now do another Go further if you assign more than three rollers to each polyamide endless belt and ensures that the length of each endless polyamide belt is greater than the circumferential length each of the endless plate belts and is smaller than the length of the corresponding one outer endless steel belt This creates a more even fleece or a more even one Slab track achieved because the endless polyamide endless belts encompassing the endless apron belts the external pressure exerted by the endless plate belts and the pressure rollers Distribute areas In addition, the leather backing of the fleece in the area between the endless plate belts and the then following rollers prevents the invention is based on two working examples shown schematically in the drawings further explained below. Fig. 1 shows the outlet part of a continuous working press with endless plate belts, the rollers forming the high pressure zone and the endless polyamide belts, which are each guided over three deflection rollers F i g. 2 the outlet part of a continuously operating press, in which the polyamide endless belts, which comprise the rollers forming the high pressure zone, also around the endless plate belts are shown in the F i g. 1 and 2 are each only the low pressure zone a continuously operating press through the endless apron conveyors arranged one above the other 3 and 4, which are each encompassed by an endless steel belt 48 and 47, indicated, wherein in the outlet area of the press the two rollers 36 and 36 forming the high pressure zone 37 are arranged in the spaces enclosed by the endless steel belts 48 and 47.

lede der eine Hochdruckzone bildenden Walzen 36 und 37 ist von einem zwischen ihr und dem entsprechenden äußeren Endlos-Stahlband 48 bzw. 47 angeordneten Polyamid-Endlosband 73 bzw. 74 umfaßt, welches über drei Umlenkwalzen 75,76 und 83 bzw. 77, 78 und 84 geführt ist, von denen die Umlenkwalzen 75, 83 und 77, 84 als Andruckmittel für die Polyamid-Endlosbänder an die äußeren Endlos-Stahlbänder 48 und 47 ausgebildet sind, während die Umlenkwalzen 76 und 78 mit ein seitliches Verlaufen dieser Polyamid-Endlosbãnder verhindernden Steuermitteln 79 und SO versehen sind Die als Andruckmittel ausgebildeten Umlenkwalzen 75, 83 und 77, 84 sind genauso wie die die Hochdruckzone bildenden Walzen 36 und 37 einander gegenüberliegend angeordnet Die von den Umlenkwalzen 75 und 77 über die Polyamid-Endlosbänder 73 und 74 und die Endlos-Stahlbänder 48 und 47 ausgeübten Druckkrãfte werden so bemessen, daß das von den Endlos-Plattenbändern 3 und 4 über die Endlos-Stahlbänder 48 und 47 zusammengedrückte Vlies nicht zurückfedern kann Entsprechendes gilt für die Umlenkwalzen 83 und 84 bezüglich der Druckkräfte, die von den Hochdruck-Walzen 36 und 37 ausgeübt werden Man sorgt daher dafür, daß der Abstand der Drehachsen 85 und 86 der Umlenkwalzen 83 und 84 voneinander derart bemessen ist, daß der Spalt zwischen den äußeren Endlos-Stahlbändern 47 und 48 im Bereich der dritten Umlenkwalzen 83 und 84 genauso groß ist wie im Bereich der die Hochdruckzone bildenden Walzen 36 und 37. Each of the rollers 36 and 37 forming a high pressure zone is of one arranged between it and the corresponding outer endless steel belt 48 and 47, respectively Polyamide endless belt 73 or 74 comprises, which over three deflection rollers 75,76 and 83 or 77, 78 and 84, of which the deflection rollers 75, 83 and 77, 84 as a pressure medium for the polyamide endless belts on the outer endless steel belts 48 and 47 are formed, while the deflection rollers 76 and 78 with a lateral Control means 79 and SO are provided which prevent these endless polyamide belts from running The deflection rollers 75, 83 and 77, 84 designed as pressure means are exactly the same like the rollers 36 and 37 forming the high pressure zone are arranged opposite one another The from the guide rollers 75 and 77 over the polyamide endless belts 73 and 74 and the endless steel belts 48 and 47 exerted compressive forces are so dimensioned that that from the endless apron belts 3 and 4 via the endless steel belts 48 and 47 Compressed fleece cannot spring back The same applies to the deflection rollers 83 and 84 with respect to the pressing forces exerted by the high pressure rollers 36 and 37 One therefore ensures that the distance between the axes of rotation 85 and 86 of the deflection rollers 83 and 84 is dimensioned from each other such that the gap between the outer endless steel belts 47 and 48 in the area of the third deflection rollers 83 and 84 is just as large as in Area of the rollers 36 and 37 forming the high pressure zone.

Zur Druckeinstellung bzw. zur Abstandsänderung der Umlenkwalzen 75 und n und 83 sind einstellbare Druckzylinder 81, 82 und 87 den entsprechenden Umlenkwalzen zugeordnet Die Umlenkwalzen 83 und 84 können auch bei kontinuierlich arbeitenden Pressen vorgesehen werden, die keine Endlos-Plattenbänder aufweisen, sondern lediglich mehrere Walzen, um die Polyamid-EndlosbBnder herumgeführt sind, weil auch dann das Rückfedern eines verdichteten Vlieses verzögert und die Rissebildung verhindert wird Das Ausführungsbeispiel der Fig 2 unterscheidet sich vom Ausführungsbeispiel der Fig 1 im wesentlichen nur dadurch, daß die Polyamid-Endlosbãnder 73' und 74 zwischen den äußeren Endlos-Stahlbandern 48 bzw. 47 und um die Endlos-Plattenbänder 3 und 4 herumgezogen sind, so daß das Ausdehnen des die Niederdruckzone verlassenden vorverdichteten Vlieses auch bis zu den Walzen 75 und 77 vermieden wird. To adjust the pressure or to change the distance between the deflection rollers 75 and n and 83 are adjustable pressure cylinders 81, 82 and 87 of the respective turning rollers The guide rollers 83 and 84 can also be assigned to continuously operating Presses are provided that have no endless apron belts, but only several rollers around which endless polyamide belts are guided, because then that too Springback of a compacted fleece is delayed and the formation of cracks is prevented The embodiment of FIG. 2 differs from the embodiment of FIG. 1 essentially only in that the endless polyamide belts 73 'and 74 between the outer endless steel belts 48 and 47 and around the endless apron belts 3 and 4 are pulled around, so that the expansion of the leaving the low pressure zone Pre-compressed fleece is also avoided up to the rollers 75 and 77.

Claims

Claims: 1. Continuously operating press, in particular Prepress, mr a fleece for the production of panels, such as chipboard, fiberboard ob The like with two arranged one behind the other to be arranged horizontally and parallel to one another Axes rotating end plates consisting of plates hinged to one another, whose facing strands can be driven in the same direction by pressure rollers and in which each endless apron belt is encompassed by an endless steel belt, where in each space enclosed by an endless steel belt - in the direction of movement of the endless plate tape dreams that are next to one another - behind the endless plate binders at least one roller is arranged, the diameter of which is larger than the diameter each pressure roller, which comprised of the two endless steel ties, one Rollers forming the high pressure zone are mounted in the same vertical plane, at least one of the rollers can be driven, at least one of these rollers in the direction of the others can be moved with an adjustable pressure force and the pressure between them Rollers is significantly higher than the pressure between the pressure rollers (low pressure zone), and each of the high pressure zone forming rollers with one between it and the Endasband arranged polyamide endless belt is included, which each fiber one Deflection roller are performed, which act as a pressure medium for the Pobamid-Endbband to the the associated endless plate bend comprising endless steel belt and each other are arranged opposite one another, the polyamide endless belts have such a thickness, that a springing up of the pressed fleece in the low pressure zone is prevented and a second deflection roller is provided with control means against a lateral Run of the Polyrunid-Endloabandes is provided, according to the additional patent application P 26 41 174.5-15 for patent application P2534939.7-15, characterized in that a third deflection roller (83,) is provided for each endless polyamide belt (73, 74) is the - in the direction of movement of the respective endless polyamide belt (73,74) seen behind the rollers (36, 37) forming the high pressure zone is arranged that the third deflection rollers (, S4) are opposite one another and that the distance between the Axes of rotation (85, J6) of these third deflection rollers (83, 84) are dimensioned from one another in this way is that the gap between the endless steel belts (47,48) in the area of the third Deflection rollers (83,) is just as large as in the area of the high-pressure zone forming Rollers (36, 37).

1 press according to claim 1, characterized in that more than three Deflection rollers are provided and that the lungs of each polyamide endless belt (73 ', 7f) larger than the circumferential sections of each of the Endbs plate tapes (3, 4) and smaller is than the length of the corresponding endless steel belt (47, 48).

The invention relates to a continuously operating press, especially pre-press, for a fleece for the production of panels such as chipboard and fiberboard od, like, with two superimposed to be horizontal and parallel to each other arranged axes rotating endless plate girders consisting of plates that are hinged to one another, whose facing strands can be driven in the same direction by pressure rollers and in which each endless apron belt is encompassed by an endless steel belt, where in each space enclosed by an endless steel belt - in the direction of movement of the endless apron conveyor dreams lying next to one another - behind the endless apron conveyors at least one roller is arranged, the diameter of which is larger than the diameter each pressure roller, which comprised of the two endless steel belts, one Rollers forming the high pressure zone are mounted in the same vertical plane, at least one of the rollers can be driven, at least one of these rollers in the direction of the others can be moved with an adjustable pressure force and the pressure between them Rolling is much higher than the pressure between the pressure rollers (low pressure zone). Such a press is the subject of patent application P 2534939.7-15.

These presses were supported by the additional patent application P2641 174s15 so further developed that wear of the parts that cause the fleece to spring back up behind the endless plate binders should prevent practically no longer occurs This was achieved by having each of the rollers forming a high pressure zone from comprises a polyamide endless belt arranged between it and the outer endless belt is, which are each guided over a deflection roller, which as a pressure means for the polyamide endless belt to the endless steel belt surrounding the assigned endless apron belt formed and arranged opposite one another, and that the polyamide endless belts have such a thickness that a springing back of the pressed in the low pressure zone Fleece is prevented and a second deflection roller is provided with control means has been provided to prevent the polyamide endless belt from running sideways Any sliding friction that occurs is converted into rolling friction, the resistances of which are considerably lower.

Polyamide endless belts with a thickness of 4 mm have proven to be no damage occurs even with endurance tests, although there are radii of curvature is deformed, which are between 225 mm and 750 mm, i.e. the radius of curvature every endless polyamide belt changes constantly.