EP3201394A1 - Method and device for the production of a fiber molding - Google Patents

Method and device for the production of a fiber molding

Info

Publication number
EP3201394A1
EP3201394A1 EP15775661.0A EP15775661A EP3201394A1 EP 3201394 A1 EP3201394 A1 EP 3201394A1 EP 15775661 A EP15775661 A EP 15775661A EP 3201394 A1 EP3201394 A1 EP 3201394A1
Authority
EP
European Patent Office
Prior art keywords
fiber molding
forming wire
fiber
sleeve
tool holder
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.)
Granted
Application number
EP15775661.0A
Other languages
German (de)
French (fr)
Other versions
EP3201394B1 (en
Inventor
Christer Halvardsson
David Kjellin
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.)
SIG Services AG
Original Assignee
SIG Technology AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SIG Technology AG filed Critical SIG Technology AG
Priority to PL15775661T priority Critical patent/PL3201394T3/en
Publication of EP3201394A1 publication Critical patent/EP3201394A1/en
Application granted granted Critical
Publication of EP3201394B1 publication Critical patent/EP3201394B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J5/00—Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch-moulds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J7/00—Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould

Definitions

  • the invention relates to a method and an apparatus for the production
  • Fiber molding in particular a head or bottom element for
  • Beverage packaging container and a manufactured thereafter molded fiber article Beverage packaging container and a manufactured thereafter molded fiber article.
  • Folded beverage containers made of fiber composites have long been known in a variety of configurations. The most common are those containers which are made of a single blank of a cardboard / plastic composite. However, there are also multi-part container known in which the head and / or bottom element is inserted into a tubular packing jacket and connected to this / or in which initially a one-sided open container is produced by appropriate folding of one end, in the then one Cover element is used, as is known for example from US 4 527 699 or from EP 0 893 355 A2, in which used head and bottom elements
  • the fiber molded part is gas- and liquid-tight coated, so that a container produced in this way also as aseptic Can serve packaging container, as it is needed for some foods or drinks.
  • the fiber molding should have a smooth surface to be coated easily, d. H. no individual fibers should protrude from the fiber molding.
  • the seam area must also be so strong and compact that it can be easily connected to the tubular end of a packing jacket or package open on one side.
  • the joining is done here usually by means of a thermal
  • the invention is therefore based on the object to propose a method and an apparatus for producing a fiber molding, in which the aforementioned disadvantages are avoided. It is a fiber molding with an improved structure and surface quality can be produced in which no protruding fibers occur and any rounded geometries can be created.
  • the solution to the problem consists in the following steps:
  • the invention comprises a fiber molding, which after the
  • the forming wire used for it wets relatively evenly, so that the molded part thus produced has substantially the same thicknesses throughout.
  • the invention has now recognized that a fiber molding of any geometry can be produced thereby particularly advantageous, in which the peripheral edge region at the end edge of the fiber molding with a particularly dense and stable
  • Fiber view can be provided if, immediately after the misting of the forming wire, the fiber material in the region of the peripheral edge of the forming wire is compressed by inflating an outer sleeve in the area in which the subsequent sealing takes place with the remaining part of the beverage container. According to the invention, no additional tools are necessary and it keeps the design effort by providing an inflatable cuff together with air supply / s within manageable limits.
  • Another teaching of the invention provides that the top of the fiber molding is sprayed with water before it is removed from the forming wire. In this way, the precipitated fibers are evenly distributed.
  • the fiber molded part is spent after removal on a pressing tool with a matching geometry to the fiber molding and mechanically compacted there with a lowerable on the mandrel punch.
  • the forming wire can be acted upon from the inside with air so that both a negative pressure for
  • Precipitation of the outer fibers and an overpressure for releasing and removing the fiber molding can be applied. In this way, the fibers settle faster and more evenly and can be very easily detached from the screen surface, as well as also remove pneumatically from the tool or forming wire.
  • Another embodiment of the invention provides that the fiber molding is dried after removal. Such drying can be carried out in a known manner by means of compressed air and / or by means of the supply of thermal energy.
  • a further teaching of the invention provides that the inner and possibly also the outer surface of the fiber molded part is / are coated gas-tight and / or liquid-tight. A gas- or liquid-tight coating is always necessary when provided with such a fiber molded part
  • Beverage packages to be filled with liquid products Beverage packages to be filled with liquid products.
  • the peripheral edge of the fiber molding and optionally an opening located in the fiber molding part is cut or introduced, wherein the cutting or insertion can be done by cutting, punching or by means of a laser.
  • the tool holder with the forming wire and the sleeve arranged on the tool holder can be easily cleaned by spraying with water.
  • a further teaching of the invention with regard to the device used provides that a mold corresponding to the shape of the fiber molding is arranged with a plurality of air channels in the interior of the forming wire.
  • the air ducts preferably run from at least one central supply line to different points of the outer surface of the molding tool.
  • a particularly elegant structural design can be achieved in that the collar is clamped inwardly from the forming wire or the forming tool and outwardly by a holding plate pressure-tight on the tool holder. In this way, an optimal seal can be achieved and is also the replacement of a cuff to be replaced with little technical effort to accomplish.
  • a circumferential air passage which has at least one connecting line for supplying and discharging compressed air. That way is ensures that a uniform inflation of the sleeve takes place in order to achieve an equally uniform compression of the lower edge of the fiber molding.
  • the mesh size of the wire mesh for the forming wire is between 40 mesh to 62 mesh, preferably 49 mesh. Thus, good surface qualities can be achieved with adequate dewatering with the fibers used.
  • the forming wire is formed as a positive mold and the sleeve is arranged at the lower edge of the forming wire.
  • the forming wire is formed as a negative mold and the sleeve is arranged at the upper edge of the forming wire.
  • the cuff is made of fluoroelastomer in order to give the cuff a long life.
  • FIG. 1 shows a first vertical section through a device according to the invention
  • Fig. 2 is a plan view of the object of Fig. 1, a further vertical section through the device according to the invention along the line III-III of Fig. 2 and Fig. 4 is a manufactured with the aforementioned device fiber molding, from below and in perspective view.
  • a forming wire 1 which extends along the outer contour of a mold 2.
  • the mold 2 is hollow on the inside and has a plurality of channels 3, which are executed in the illustrated preferred embodiment as bores extending from the surface of the mold 2 at suitable locations to the hollow interior of the mold 2.
  • the mold 2 is located on a tool holder 4 and is connected with only partially visible screws 5 from below with this.
  • the tool holder 4 has a central supply line 6, which may also be designed as a bore.
  • a mounting plate 7 which in turn has a central supply line for the air supply of the mold 2.
  • a preferably designed as an O-ring seal 8 provides the necessary tightness of the contact area between the tool holder 4 and mounting plate 7.
  • An inflatable cuff 9 is present, at its inner end of the mold 2 with the tool holder 4 and the outer End of an attached plate 10 is clamped.
  • Below the sleeve 9 runs a the shape of the sleeve 9 corresponding circumferential air duct 11, which will be described in more detail below.
  • Fig. 2 which shows a plan view of the apparatus of FIG. 1, clearly shows that the mold 2 is designed asymmetrically and that the uplifting nozzle is arranged eccentrically to the vertical axis of the Faserfomteils.
  • Fig. 3 has substantially the same structure as Fig. 1, but here are clearly arranged below the circumferential annular channel 11 supply channels for a compressed air connection 12, in the illustrated and preferred embodiment, double present shown.
  • the entire device is immersed in a pulp slurries, so that the entire forming wire 1 is surrounded by pulp. After lifting the
  • the forming wire 1 is evenly fogged and the fiber molded part separates from the screen structure by generating a pressure inside the
  • FIG. 4 A fiber molded part F produced in this way is shown in FIG. 4, for better representation of the contour according to the forming wire 1 or forming tool 2 the fiber shaped part F "is located upside down.
  • a uniform circumferential edge R which is required for the sealing with a tubular beverage container casing (not shown)
  • a socket S pointing downwards in this illustration, which is suitable for receiving a screw cap.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Paper (AREA)
  • Making Paper Articles (AREA)
  • Non-Alcoholic Beverages (AREA)
  • Apparatus For Making Beverages (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Closures For Containers (AREA)
  • Packages (AREA)

Abstract

The invention relates to a method and a device for the production of a fiber molding (F), in particular of a top and bottom element for beverage package containers. In order to produce a fiber molding (F) having an improved structure and surface quality, wherein there are no protruding fibers and any rounded geometry is achieved, the following steps are proposed: - immersion of a forming screen arranged on a tool holder into a pulp slurry, - raising the tool holder in order to fully extract the coated forming screen, - sealing the fiber material in the region of the peripheral border of the forming screen by inflating a cuff extending circumferentially there, - releasing the pressure in the cuff, and – removing the fiber molding. A corresponding device for the production of a fiber molding (F), in particular a top and bottom element for beverage package containers, comprising a tool holder (4) and a forming screen (1) arranged thereon, is characterized by a circumferential cuff (9), which extends below the border of the forming screen (1) and that can be inflated from an initial position to an operating position.

Description

VERFAHREN UND VORRICHTUNG ZUR HERSTELLUNG EINES  METHOD AND DEVICE FOR PRODUCING A
FASERFORMTEILS  FIBER MOLDING
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Herstellung The invention relates to a method and an apparatus for the production
Faserformteils, insbesondere eines Kopf- oder Bodenelements für Fiber molding, in particular a head or bottom element for
Getränkepackungsbehälter und ein danach hergestelltes Faserformteil. Beverage packaging container and a manufactured thereafter molded fiber article.
Gefaltete Getränkebehälter aus Faserverbundstoffen sind seit langem in vielfältigen Ausgestaltungen bekannt. Am meisten verbreitet sind dabei solche Behälter, die aus einem einzigen Zuschnitt aus einem Karton/Kunststoff- Verbund hergestellt sind. Es sind jedoch auch mehrteilige Behälter bekannt, bei denen das Kopf- und/oder Bodenelement in einen rohrförmigen Packungsmantel eingesetzt und mit diesem verbunden wird/werden bzw. bei dem zunächst ein einseitig offener Behälter durch entsprechende Faltung eines Endes hergestellt wird, in den dann ein Deckelelement eingesetzt wird, wie dies beispielsweise aus der US 4 527 699 oder auch aus der EP 0 893 355 A2 bekannt ist, bei denen eingesetzte Kopf- und Bodenelemente aus Folded beverage containers made of fiber composites have long been known in a variety of configurations. The most common are those containers which are made of a single blank of a cardboard / plastic composite. However, there are also multi-part container known in which the head and / or bottom element is inserted into a tubular packing jacket and connected to this / or in which initially a one-sided open container is produced by appropriate folding of one end, in the then one Cover element is used, as is known for example from US 4 527 699 or from EP 0 893 355 A2, in which used head and bottom elements
Kunststoff verwendet werden. Plastic used.
Darüber hinaus ist es auch bekannt, mehrteilige Verpackungsbehälter herzustellen, bei denen ein separat hergestelltes Kopf- und/oder Bodenelement verwendet wird/werden, wobei die eingesetzten Teile als Faserformteile aus Pulpe, also aus einer faserhaltigen Schlämme aus Zellstoff hergestellt werden. So beschreibt die DE 10 2014 014 993 AI, welche auf die Anmelderin der vorliegenden Patentanmeldung zurückgeht, einen Behälter und ein Verfahren zur Herstellung eines Behälters, bei dem ein rohrförmiger Grundkörper mit mindestens einem mit dem Grundkörper verbundenen Faserformteil versehen wird, um einen flüssigkeitsdichten Moreover, it is also known to produce multi-part packaging containers, in which a separately manufactured head and / or bottom element is / are used, the parts used are produced as fiber molded parts from pulp, ie from a fibrous slurry of pulp. For example, DE 10 2014 014 993 A1, which is assigned to the assignee of the present patent application, describes a container and a method for producing a container in which a tubular base body is provided with at least one fiber molded part connected to the main body in order to produce a liquid-tight seal
Getränkebehälter zu bilden. Dabei ist das Faserformteil gas- und flüssigkeitsdicht beschichtet, so dass ein auf diese Weise hergestellter Behälter auch als aseptischer Verpackungsbehälter dienen kann, wie er für manche Lebensmittel oder Getränke benötigt wird. To form beverage containers. In this case, the fiber molded part is gas- and liquid-tight coated, so that a container produced in this way also as aseptic Can serve packaging container, as it is needed for some foods or drinks.
Es ist klar, dass die Verbindung von Faserformteil mit dem rohrförmigen Grundkörper einen besonders empfindlichen Bereich darstellt, da hier, anders als beim gefalteten Behälter aus einem einzigen Zuschnitt, eine weitere Naht vorhanden ist, welche gas- und flüssigkeitsdicht gefertigt werden muss. It is clear that the combination of fiber molding with the tubular body is a particularly sensitive area, as here, unlike the folded container from a single blank, a further seam is present, which must be made gas and liquid tight.
An die Form, Struktur und Oberfläche des Faserformteils werden also besondere Anforderungen gestellt. Neben einer exakten Ausführung der Oberfläche im The shape, structure and surface of the fiber molding so special demands are made. In addition to an exact execution of the surface in the
[späteren) Nahtbereich, also im Bereich der umlaufenden Kante des Faserformteils soll das Faserformteil eine glatte Oberfläche haben, um leichter beschichtet werden zu können, d. h. es sollen keine einzelnen Fasern aus dem Faserformteil hervorstehen. [Later] seam area, so in the region of the peripheral edge of the fiber molding, the fiber molding should have a smooth surface to be coated easily, d. H. no individual fibers should protrude from the fiber molding.
Der Nahtbereich muss darüber hinaus so stabil und kompakt sein, dass er sich gut mit dem rohrförmigen Ende eines Packungsmantels bzw. einer einseitig offenen Packung verbinden lässt. Das Fügen geschieht hierbei in der Regel mittels einer thermischenThe seam area must also be so strong and compact that it can be easily connected to the tubular end of a packing jacket or package open on one side. The joining is done here usually by means of a thermal
Versiegelung unter mechanischem Druck. Sealing under mechanical pressure.
Damit nun die umlaufende Kante des Faserformteils eine ausreichende Stabilität aufweist, wird in der US 2 177 864 beschrieben, eine mechanische Formung bzw. Verdichtung des Randbereichs des Faserformteils durch ein spezielles, rigides Formwerkzeug erfolgen zu lassen. In Verbesserung dieser technischen Lösung wird in der US 3 216 890 vorgeschlagen, die Verdichtung des Randbereiches eines So that the peripheral edge of the fiber molded part has sufficient stability, it is described in US Pat. No. 2,177,864 that mechanical shaping or compression of the edge region of the fiber molded part can be effected by a special, rigid molding tool. In an improvement of this technical solution is proposed in US 3,216,890, the compression of the edge region of a
Faserformteils mittels eines passiv verformbaren Elementes durchzuführen, welches die angrenzende Struktur verdichtet und damit verbessert. Beide genannten To perform fiber molding by means of a passively deformable element, which compresses the adjacent structure and thus improved. Both mentioned
Lösungen gehen mit einem nicht unerheblichen konstruktiven Aufwand einher. Solutions go hand in hand with considerable design effort.
Der Erfindung liegt daher die Aufgabe zu Grunde, ein Verfahren und eine Vorrichtung zur Herstellung eines Faserformteils vorzuschlagen, bei denen die zuvor erwähnten Nachteile vermieden werden. Es soll ein Faserformteil mit einer verbesserten Struktur und Oberflächengüte hergestellt werden, bei dem keine vorstehenden Fasern auftreten und beliebig gerundete Geometrien geschaffen werden können. The invention is therefore based on the object to propose a method and an apparatus for producing a fiber molding, in which the aforementioned disadvantages are avoided. It is a fiber molding with an improved structure and surface quality can be produced in which no protruding fibers occur and any rounded geometries can be created.
Hinsichtlich des erfindungsgemäßen Verfahrens besteht die Lösung der Aufgabe in den folgenden Schritten: With regard to the method according to the invention, the solution to the problem consists in the following steps:
- Eintauchen eines auf einem Werkzeughalter angeordneten Formsiebes in Immersing a forming screen arranged on a tool holder
eine Pulpeschlämme,  a pulp slurries,
- Anheben des Werkezughalters, um das beschlagene Formsieb vollständig  - Lifting the tool holder to complete the misted forming wire
aus der Pulpeschlämme zu fahren,  to drive out of the pulp slurry,
- Verdichten des Fasermaterials im Bereich des umlaufenden Randes des Formsiebes durch Aufblähen einer dort ringsum verlaufenden Manschette,  Compacting the fiber material in the region of the circumferential edge of the forming screen by inflating a collar running around it,
- Entspannen des Drucks in der Manschette und  - Relieve the pressure in the cuff and
- Entfernen des Faserformteils.  - Remove the fiber molding.
Vorrichtungsmäßig wird die Aufgabe dadurch gelöst, dass eine umlaufende In terms of apparatus, the object is achieved in that a circumferential
Manschette vorgesehen ist, die unterhalb des Randes des Formsiebes verläuft und von einer Grundstellung in eine Arbeitsstellung aufblähbar ist. Schließlich umfasst die Erfindung ein Faserformteil, welches nach dem Cuff is provided, which extends below the edge of the forming wire and can be inflated from a basic position to a working position. Finally, the invention comprises a fiber molding, which after the
erfindungsgemäßen Verfahren hergestellt wird. process according to the invention is produced.
Bei der Herstellung von Faserformteilen durch Eintauchen in eine Pulpeschlämme benetzt sich das dazu verwendete Formsieb relativ gleichmäßig, so dass das so hergestellte Formteil im Wesentlichen durchgehend gleiche Stärken aufweist. In the production of fiber molded parts by immersion in a pulp slurries, the forming wire used for it wets relatively evenly, so that the molded part thus produced has substantially the same thicknesses throughout.
Die Erfindung hat nun erkannt, dass ein Faserformteil beliebiger Geometrie dadurch besonders vorteilhaft hergestellt werden kann, in dem der umlaufende Randbereich an der Endkante des Faserformteils mit einer besonders dichten und stabilen The invention has now recognized that a fiber molding of any geometry can be produced thereby particularly advantageous, in which the peripheral edge region at the end edge of the fiber molding with a particularly dense and stable
Fasersicht versehen werden kann, wenn dazu unmittelbar nach dem Beschlagen des Formsiebes das Fasermaterial im Bereich des umlaufenden Randes des Formsiebes durch Aufblähen einer äußeren Manschette in dem Bereich verdichtet wird, in dem die spätere Versiegelung mit dem restlichen Teil des Getränkebehälters stattfindet. Erfindungsgemäß sind keine zusätzlichen Werkzeuge notwendig und es hält sich auch der konstruktive Aufwand durch das Vorsehen einer aufblähbaren Manschette nebst Luftzuleitung/en in überschaubaren Grenzen. Fiber view can be provided if, immediately after the misting of the forming wire, the fiber material in the region of the peripheral edge of the forming wire is compressed by inflating an outer sleeve in the area in which the subsequent sealing takes place with the remaining part of the beverage container. According to the invention, no additional tools are necessary and it keeps the design effort by providing an inflatable cuff together with air supply / s within manageable limits.
Eine weitere Lehre der Erfindung sieht vor, dass die Oberseite des Faserformteils noch vor dessen Entfernen vom Formsieb mit Wasser besprüht wird. Auf diese Weise werden die niedergeschlagenen Fasern gleichmäßig verteilt. Another teaching of the invention provides that the top of the fiber molding is sprayed with water before it is removed from the forming wire. In this way, the precipitated fibers are evenly distributed.
Alternativ oder zusätzlich ist es nach einer weiteren Ausgestaltung der Erfindung möglich, dass das Faserformteil nach dem Entfernen auf ein Presswerkzeug mit einer zum Faserformteil angepassten korrespondierenden Geometrie verbracht und dort mit einem auf den Dorn absenkbaren Pressstempel mechanisch kompaktiert wird. Auf diese Weise können die äußere Oberfläche des Faserformteils und seine innereAlternatively or additionally, it is possible according to a further embodiment of the invention that the fiber molded part is spent after removal on a pressing tool with a matching geometry to the fiber molding and mechanically compacted there with a lowerable on the mandrel punch. In this way, the outer surface of the fiber molding and its inner
Struktur noch weiter verbessert werden, da das Faserformteil noch eine ausreichende Restfeuchte besitzt und daher in diesem Stadium weiter verformbar bzw. Structure be further improved because the fiber molding still has a sufficient residual moisture and therefore further deformable or at this stage
kompaktierbar ist. Nach einer weiteren Lehre der Erfindung ist vorgesehen, dass das Formsieb von innen derart mit Luft beaufschlagt werden kann, dass sowohl ein Unterdruck zum is compactable. According to a further teaching of the invention it is provided that the forming wire can be acted upon from the inside with air so that both a negative pressure for
Niederschlagen der äußeren Fasern als auch ein Überdruck zum Lösen und Entfernen des Faserformteils aufgebracht werden kann. Auf diese Weise schlagen sich die Fasern schneller und gleichmäßiger nieder und lassen sich sehr leicht von der Sieboberfläche ablösen, sowie zudem auch pneumatisch vom Werkzeug bzw. Formsieb entfernen. Precipitation of the outer fibers and an overpressure for releasing and removing the fiber molding can be applied. In this way, the fibers settle faster and more evenly and can be very easily detached from the screen surface, as well as also remove pneumatically from the tool or forming wire.
Eine andere Ausgestaltung der Erfindung sieht vor, dass das Faserformteil nach dem Entfernen getrocknet wird. Eine solche Trocknung kann in bekannter Weise mittels Druckluft und/oder mittels der Zufuhr von thermischer Energie erfolgen. Eine weitere Lehre der Erfindung sieht vor, dass die innere und gegebenenfalls auch die äußere Oberfläche des Faserformteils gas- und/oder flüssigkeitsdicht beschichtet wird/werden. Eine gas- bzw. flüssigkeitsdichte Beschichtung ist immer dann notwendig, wenn die mit einem solchen Faserformteil versehenen Another embodiment of the invention provides that the fiber molding is dried after removal. Such drying can be carried out in a known manner by means of compressed air and / or by means of the supply of thermal energy. A further teaching of the invention provides that the inner and possibly also the outer surface of the fiber molded part is / are coated gas-tight and / or liquid-tight. A gas- or liquid-tight coating is always necessary when provided with such a fiber molded part
Getränkepackungen mit flüssigen Produkten befüllt werden sollen. Beverage packages to be filled with liquid products.
Nach einer weiteren Ausgestaltung der Erfindung wird die umlaufende Kante des Faserformteils und ggf. eine im Faserformteil befindliche Öffnung abgelängt bzw. eingebracht, wobei das Ablängen bzw. Einbringen durch Schneiden, Stanzen oder mittels eines Lasers erfolgen kann. Hierdurch lassen sich die notwendig exakten Passungen sauber und auf einfache Art und Weise erreichen. According to a further embodiment of the invention, the peripheral edge of the fiber molding and optionally an opening located in the fiber molding part is cut or introduced, wherein the cutting or insertion can be done by cutting, punching or by means of a laser. As a result, the necessary exact fits can be achieved cleanly and in a simple manner.
Der Werkzeughalter mit dem Formsieb und der am Werkzeughalter angeordneten Manschette lässt sich durch Besprühen mit Wasser auf einfache Weise reinigen. The tool holder with the forming wire and the sleeve arranged on the tool holder can be easily cleaned by spraying with water.
Eine weitere Lehre der Erfindung hinsichtlich der verwendeten Vorrichtung sieht vor, dass im Inneren des Formsiebes ein der Form des Faserformteils entsprechendes Formwerkzeug mit einer Vielzahl von Luftkanälen angeordnet ist. Dabei verlaufen bevorzugt die Luftkanäle von wenigstens einer zentralen Zuleitung zu verschiedenen Stellen der äußeren Oberfläche des Formwerkzeuges. A further teaching of the invention with regard to the device used provides that a mold corresponding to the shape of the fiber molding is arranged with a plurality of air channels in the interior of the forming wire. In this case, the air ducts preferably run from at least one central supply line to different points of the outer surface of the molding tool.
Eine besonders elegante konstruktive Gestaltung lässt sich dadurch erreichen, dass die Manschette nach innen hin vom Formsieb bzw. dem Formwerkzeug und nach außen hin von einer Halteplatte druckdicht am Werkzeughalter eingespannt ist. Auf diese Weise lässt sich eine optimale Abdichtung erreichen und ist auch der Austausch einer zu ersetzenden Manschette mit einem geringen technischen Aufwand zu bewerkstelligen. A particularly elegant structural design can be achieved in that the collar is clamped inwardly from the forming wire or the forming tool and outwardly by a holding plate pressure-tight on the tool holder. In this way, an optimal seal can be achieved and is also the replacement of a cuff to be replaced with little technical effort to accomplish.
In weiterer Ausgestaltung der Erfindung ist vorgesehen, dass unterhalb der In a further embodiment of the invention, it is provided that below the
Manschette ein umlaufender Luftkanal vorgesehen ist, welcher mindestens eine Anschlussleitung zum Zu- bzw. Abführen von Druckluft aufweist. Auf diese Weise ist gewährleistet, dass ein gleichmäßiges Aufblähen der Manschette erfolgt, um eine ebenso gleichmäßige Verdichtung des unteren Randes des Faserformteils zu erreichen. Eine andere Lehre der Erfindung sieht vor, dass die Maschenweite des Drahtgeflechts für das Formsieb zwischen 40 Mesh bis 62 Mesh, bevorzugt 49 Mesh, beträgt. Damit lassen sich mit den verwendeten Fasern gute Oberflächengüten bei ausreichender Entwässerung erreichen Nach einer weitereren Ausgestaltung der Erfindung ist vorgesehen, dass das Formsieb als Positivform ausgebildet und die Manschette am unteren Rand des Formsiebes angeordnet ist. Cuff a circumferential air passage is provided, which has at least one connecting line for supplying and discharging compressed air. That way is ensures that a uniform inflation of the sleeve takes place in order to achieve an equally uniform compression of the lower edge of the fiber molding. Another teaching of the invention provides that the mesh size of the wire mesh for the forming wire is between 40 mesh to 62 mesh, preferably 49 mesh. Thus, good surface qualities can be achieved with adequate dewatering with the fibers used. According to a further embodiment of the invention, it is provided that the forming wire is formed as a positive mold and the sleeve is arranged at the lower edge of the forming wire.
Alternativ ist es jedoch auch möglich, dass das Formsieb als Negativform ausgebildet ist und die Manschette am oberen Rand des Formsiebes angeordnet ist. Alternatively, however, it is also possible that the forming wire is formed as a negative mold and the sleeve is arranged at the upper edge of the forming wire.
Schließlich ist es besonders vorteilhaft, wenn die Manschette aus Fluorelastomer hergestellt ist, um der Manschette eine hohe Lebensdauer verleihen zu können. Die Erfindung wird nachfolgend anhand einer lediglich ein bevorzugtes Finally, it is particularly advantageous if the cuff is made of fluoroelastomer in order to give the cuff a long life. The invention will now be described with reference to a preferred one
Ausführungsbeispiel darstellenden Zeichnung näher erläutert. Embodiment illustrative drawing explained in more detail.
In der Zeichnung zeigen Fig. 1 einen ersten Vertikalschnitt durch eine erfindungsgemäße Vorrichtung, 1 shows a first vertical section through a device according to the invention,
Fig. 2 eine Draufsicht auf den Gegenstand von Fig. 1, einen weiteren Vertikalschnitt durch die erfindungsgemäße Vorrichtung entlang der Linie III-III aus Fig. 2 und Fig. 4 ein mit der vorgenannten Vorrichtung hergestelltes Faserformteil, von unten und in perspektivischer Ansicht. Fig. 2 is a plan view of the object of Fig. 1, a further vertical section through the device according to the invention along the line III-III of Fig. 2 and Fig. 4 is a manufactured with the aforementioned device fiber molding, from below and in perspective view.
In Fig. 1 erkennt man zunächst ein Formsieb 1, welches sich entlang der äußeren Kontur eines Formwerkzeuges 2 erstreckt. Das Formwerkzeug 2 ist innen hohl und weist eine Mehrzahl von Kanälen 3 auf, welche im dargestellten und insoweit bevorzugten Ausführungsbeispiel als Bohrungen ausgeführt sind, die sich von der Oberfläche des Formwerkzeuges 2 an geeigneten Stellen bis in das das hohle Innere des Formwerkzeugs 2 erstrecken. Das Formwerkzeug 2 befindet sich dabei auf einem Werkzeughalter 4 und ist mit nur teilweise erkennbaren Schrauben 5 von unten mit diesem verbunden. Auch der Werkzeughalter 4 weist eine zentrale Zuleitung 6 auf, die gleichfalls als Bohrung ausgeführt sein kann. In Fig. 1 can be seen first a forming wire 1, which extends along the outer contour of a mold 2. The mold 2 is hollow on the inside and has a plurality of channels 3, which are executed in the illustrated preferred embodiment as bores extending from the surface of the mold 2 at suitable locations to the hollow interior of the mold 2. The mold 2 is located on a tool holder 4 and is connected with only partially visible screws 5 from below with this. Also, the tool holder 4 has a central supply line 6, which may also be designed as a bore.
Unterhalb des Werkzeughalters 4 erkennt man eine Befestigungsplatte 7, die wiederum eine zentrale Zuleitung zur Luftzufuhr des Formwerkzeugs 2 aufweist. Eine bevorzugt als O-Ring ausgeführte Dichtung 8 sorgt für die nötige Dichtheit des Kontaktbereiches zwischen Werkzeughalter 4 und Befestigungsplatte 7. Um das Formwerkzeug 2 herum ist eine aufblähbare Manschette 9 vorhanden, die an ihrem inneren Ende vom Formwerkzeug 2 mit dem Werkzeughalter 4 und deren äußeres Ende von einer aufgesetzten Halteplatte 10 eingespannt ist. Unterhalb der Manschette 9 verläuft ein der Form der Manschette 9 entsprechender umlaufender Luftkanal 11, der weiter unten noch näher beschrieben wird. Below the tool holder 4 can be seen a mounting plate 7, which in turn has a central supply line for the air supply of the mold 2. A preferably designed as an O-ring seal 8 provides the necessary tightness of the contact area between the tool holder 4 and mounting plate 7. Around the mold 2 around an inflatable cuff 9 is present, at its inner end of the mold 2 with the tool holder 4 and the outer End of an attached plate 10 is clamped. Below the sleeve 9 runs a the shape of the sleeve 9 corresponding circumferential air duct 11, which will be described in more detail below.
Fig. 2, die eine Draufsicht auf die Vorrichtung gemäß Fig. 1 zeigt, lässt deutlich erkennen, dass das Formwerkzeug 2 asymmetrisch ausgeführt ist und dass der sich erhebende Stutzen exzentrisch zur Hochachse des Faserfomteils angeordnet ist. Fig. 2, which shows a plan view of the apparatus of FIG. 1, clearly shows that the mold 2 is designed asymmetrically and that the uplifting nozzle is arranged eccentrically to the vertical axis of the Faserfomteils.
Fig. 3 hat im Wesentlichen den gleichen Aufbau wie Fig. 1, hier sind jedoch deutlich die unterhalb des umlaufenden Ringkanals 11 angeordneten Zufuhrkanäle für einen Druckluftanschluss 12, im dargestellten und bevorzugten Ausführungsbeispiel doppelt vorhanden, dargestellt. Zur Herstellung wird die gesamte Vorrichtung in eine Pulpeschlämme eingetaucht, so dass das gesamte Formsieb 1 von Pulpe umgeben ist. Nach dem Anheben des Fig. 3 has substantially the same structure as Fig. 1, but here are clearly arranged below the circumferential annular channel 11 supply channels for a compressed air connection 12, in the illustrated and preferred embodiment, double present shown. For preparation, the entire device is immersed in a pulp slurries, so that the entire forming wire 1 is surrounded by pulp. After lifting the
Werkzeughalters 4 ist das Formsieb 1 gleichmäßig beschlagen und das Faserformteil löst sich von der Siebstruktur durch Erzeugen eines Druckes im inneren des Tool holder 4, the forming wire 1 is evenly fogged and the fiber molded part separates from the screen structure by generating a pressure inside the
Formsiebes 1 durch die Bohrung 6 und die Kanäle 3. Gleichzeitig oder unmittelbar darauf wird die ringsum verlaufende Manschette 9 durch entsprechende  Formsiebes 1 through the hole 6 and the channels 3. At the same time or immediately thereafter, the all-around running sleeve 9 by appropriate
Druckluftzufuhr über die Anschlüsse 12 aufgebläht, so dass sich der untere Rand des Faserformteils durch die nach außen aufgewölbte Manschette gleichmäßig verdichtet. Nach dem Entspannen des Drucks in der Manschette 9 kann das Faserformteil durch Erhöhung des Drucks über die Kanäle 3 vom Formwerkzeug 2 entfernt werden. Compressed air supply inflated through the terminals 12, so that the lower edge of the fiber molding uniformly compressed by the outwardly bulging cuff. After releasing the pressure in the sleeve 9, the fiber molding can be removed by increasing the pressure on the channels 3 from the mold 2.
Ein so hergestelltes Faserformteil F ist in Fig. 4 gezeigt, zur besseren Darstellung der Kontur gemäß Formsieb 1 bzw. Formwerkzeug 2 befindet sich das Faserformteil F „auf dem Kopf. Man erkennt deutlich einen gleichförmig umlaufenden Rand R, der für die Versiegelung mit einem rohrförmigen Getränkebehältermantel (nicht dargestellt] benötigt wird. Ferner erkennt man deutlich einen - in dieser Darstellung nach unten weisenden - Stutzen S, welcher zur Aufnahme eines Schraubverschlusses geeignet ist. A fiber molded part F produced in this way is shown in FIG. 4, for better representation of the contour according to the forming wire 1 or forming tool 2 the fiber shaped part F "is located upside down. One clearly recognizes a uniform circumferential edge R, which is required for the sealing with a tubular beverage container casing (not shown) Furthermore, one clearly recognizes a socket S pointing downwards in this illustration, which is suitable for receiving a screw cap.

Claims

Patentansprüche claims
Verfahren zur Herstellung eines Faserformteils, insbesondere eines Kopf- oder Bodenelements für Getränkepackungsbehälter, gekennzeichnet durch die folgenden Schritte: Process for producing a fiber molding, in particular a head or bottom element for beverage containers, characterized by the following steps:
- Eintauchen eines auf einem Werkzeughalter angeordneten Formsiebes in eine Pulpeschlämme,  Dipping a forming screen arranged on a tool holder into a pulp sludge,
- Anheben des Werkzeughalters, um das beschlagene Formsieb vollständig aus der Pulpeschlämme zu fahren,  - raising the tool holder in order to drive the misted forming wire completely out of the pulp slurries,
- Verdichten des Fasermaterials im Bereich des umlaufenden Randes des Formsiebes durch Aufblähen einer dort ringsum verlaufenden Manschette, Compacting the fiber material in the region of the circumferential edge of the forming screen by inflating a collar running around it,
- Entspannen des Drucks in der Manschette und - Relieve the pressure in the cuff and
- Entfernen des Faserformteils.  - Remove the fiber molding.
Verfahren nach Anspruch 1,Method according to claim 1,
dadurch gekennzeichnet, dass characterized in that
die Oberseite des Faserformteils noch vor dessen Entfernen vom Formsieb mit Wasser besprüht wird.  the top of the fiber molding is sprayed with water before it is removed from the forming wire.
3. Verfahren nach Anspruch 1 oder 2, 3. The method according to claim 1 or 2,
dadurch gekennzeichnet, dass  characterized in that
das Faserformteil nach dem Entfernen auf ein Presswerkzeug mit einer zum Faserformteil korrespondierenden Geometrie verbracht und dort mechanisch kompaktiert wird.  the fiber molded part is spent after removal on a pressing tool with a geometry corresponding to the fiber molding and mechanically compacted there.
Verfahren nach einem der Ansprüche 1 bis 3, Method according to one of claims 1 to 3,
dadurch gekennzeichnet, dass  characterized in that
das Formsieb von innen derart mit Luft beaufschlagt werden kann, dass sowohl ein Unterdruck zum Niederschlagen der Fasern als auch ein Üb  The forming wire can be acted upon from the inside so that both a negative pressure for depositing the fibers and a Üb
Lösen und Entfernen des Faserformteils aufgebracht werden i Loosening and removing the fiber molding are applied i
5. Verfahren nach einem der Ansprüche 1 bis 4, 5. The method according to any one of claims 1 to 4,
dadurch gekennzeichnet, dass  characterized in that
das Faserformteil nach dem Entfernen getrocknet wird.  the fiber molding is dried after removal.
6. Verfahren nach Anspruch 5, 6. The method according to claim 5,
dadurch gekennzeichnet, dass  characterized in that
das Trocknen mittels Druckluft erfolgt.  the drying takes place by means of compressed air.
7. Verfahren nach Anspruch 5, 7. The method according to claim 5,
dadurch gekennzeichnet, dass  characterized in that
das Trocknen mittels zugeführter thermischer Energie erfolgt.  the drying takes place by means of supplied thermal energy.
8. Verfahren nach einem der Ansprüche 1 bis 7, 8. The method according to any one of claims 1 to 7,
dadurch gekennzeichnet, dass  characterized in that
die innere und gegebenenfalls auch die äußere Oberfläche des Faserformteils gas- und/oder flüssigkeitsdicht beschichtet wird/werden.  the inner and possibly also the outer surface of the fiber molded part is / are coated gas-tight and / or liquid-tight.
9. Verfahren nach einem der Ansprüche 1 bis 8, 9. The method according to any one of claims 1 to 8,
dadurch gekennzeichnet, dass  characterized in that
die umlaufende Kante des Faserformteils und ggf. eine im Faserformteil befindliche Öffnung abgelängt bzw. eingebracht wird.  the peripheral edge of the fiber molding and optionally cut or introduced an opening located in the fiber molding part.
10. Verfahren nach Anspruch 9, 10. The method according to claim 9,
dadurch gekennzeichnet, dass  characterized in that
das Ablängen der Kante bzw. Einbringen der Öffnung durch Schneiden, Stanzen oder mittels eines Lasers erfolgt. the cutting of the edge or insertion of the opening by cutting, punching or by means of a laser.
11. Verfahren nach einem der Ansprüche 1 bis 10, 11. The method according to any one of claims 1 to 10,
dadurch gekennzeichnet, dass  characterized in that
der Werkzeughalter mit dem Formsieb und der Manschette durch Besprühen mit Wasser gereinigt wird und dass die Manschette am Werkzeughalter angeordnet ist.  the tool holder with the forming wire and the sleeve is cleaned by spraying with water and that the sleeve is arranged on the tool holder.
12. Vorrichtung zur Herstellung eines Faserformteils (F), insbesondere eines Kopfoder Bodenelements für Getränkepackungsbehälter, mit einem Werkzeughalter [4) und einem daran angeordneten Formsieb (1), 12. An apparatus for producing a fiber molding (F), in particular a head or bottom element for beverage containers, with a tool holder [4] and a forming wire (1) arranged thereon,
dadurch gekennzeichnet, dass  characterized in that
eine umlaufende Manschette (9) vorgesehen ist, die unterhalb des Randes des Formsiebes (1) verläuft und von einer Grundstellung in eine Arbeitsstellung aufblähbar ist.  a circumferential sleeve (9) is provided which extends below the edge of the forming wire (1) and can be inflated from a basic position into a working position.
13. Vorrichtung nach Anspruch 12, 13. Device according to claim 12,
dadurch gekennzeichnet, dass  characterized in that
im Inneren des Formsiebes [1] ein der Form des Faserformteils (F)  inside the forming wire [1] one of the shape of the fiber molding (F)
entsprechendes Formwerkzeug (2) mit einer Vielzahl von Luftkanälen [3) angeordnet ist.  corresponding mold (2) with a plurality of air channels [3] is arranged.
14. Vorrichtung nach Anspruch 13, 14. Device according to claim 13,
dadurch gekennzeichnet, dass  characterized in that
die Luftkanäle (3) von wenigstens einer zentralen Zuleitung (6) zu  the air ducts (3) from at least one central supply line (6)
verschiedensten Stellen der äußeren Oberfläche des Formwerkzeuges (2) verlaufen.  various points of the outer surface of the mold (2) run.
15. Vorrichtung nach einem der Ansprüche 12 bis 14, 15. Device according to one of claims 12 to 14,
dadurch gekennzeichnet, dass  characterized in that
die Manschette (9) nach innen hin vom Formsieb (1) bzw. dem Formwerkzeug (2) und nach außen hin von einer Halteplatte (10) druckdicht am the sleeve (9) inwardly from the forming wire (1) or the mold (2) and to the outside of a holding plate (10) pressure-tight on
Werkzeughalter (4) eingespannt ist.  Tool holder (4) is clamped.
Vorrichtung nach einem der Ansprüche 12 bis 15, Device according to one of claims 12 to 15,
dadurch gekennzeichnet, dass  characterized in that
unterhalb der Manschette (9) ein umlaufender Luftkanal (11) vorgesehen ist, welcher mindestens ein Druckluftanschluss (12) zum Zu- bzw. Abführen von Druckluft aufweist.  below the sleeve (9) a circumferential air channel (11) is provided, which has at least one compressed air connection (12) for supplying and discharging compressed air.
Vorrichtung nach einem der Ansprüche 12 bis 16, Device according to one of claims 12 to 16,
dadurch gekennzeichnet, dass  characterized in that
die Maschenweite des Drahtgeflechts für das Formsieb (1) zwischen 40 Mesh und 62 Mesh, bevorzugt 49 Mesh beträgt.  the mesh size of the wire mesh for the forming wire (1) is between 40 mesh and 62 mesh, preferably 49 mesh.
Vorrichtung nach einem der Ansprüche 12 bis 17, Device according to one of claims 12 to 17,
dadurch gekennzeichnet, dass  characterized in that
das Formsieb (1) als Positivform ausgebildet und die Manschette (9) am unteren Rand des Formsiebes (1) angeordnet ist.  formed the forming wire (1) as a positive mold and the sleeve (9) at the bottom of the forming wire (1) is arranged.
Vorrichtung nach einem der Ansprüche 12 bis 17, Device according to one of claims 12 to 17,
dadurch gekennzeichnet, dass  characterized in that
das Formsieb als Negativform ausgebildet und die Manschette am oberen Rand des Formsiebes angeordnet ist.  formed the forming wire as a negative mold and the sleeve is arranged at the upper edge of the forming wire.
Vorrichtung nach einem der Ansprüche 12 bis 19, Device according to one of claims 12 to 19,
dadurch gekennzeichnet, dass  characterized in that
die Manschette (9) aus Fluorelastomer besteht.  the sleeve (9) consists of fluoroelastomer.
21. Faserformteil (F), insbesondere ein Kopf- oder Bodenelement für 21. fiber molding (F), in particular a head or bottom element for
Getränkepackungsbehälter, hergestellt nach dem Verfahren gemäß einem der Ansprüche 1 bis 11.  Beverage packing container, produced by the method according to one of claims 1 to 11.
EP15775661.0A 2014-09-30 2015-09-29 Method and device for the production of a fiber molding Active EP3201394B1 (en)

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US10309062B2 (en) 2019-06-04

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