EP2829482B1 - Process for three-dimensional forming of flat material - Google Patents

Process for three-dimensional forming of flat material Download PDF

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Publication number
EP2829482B1
EP2829482B1 EP14178146.8A EP14178146A EP2829482B1 EP 2829482 B1 EP2829482 B1 EP 2829482B1 EP 14178146 A EP14178146 A EP 14178146A EP 2829482 B1 EP2829482 B1 EP 2829482B1
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EP
European Patent Office
Prior art keywords
reshaping
during
piston
forming
fold retainer
Prior art date
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Active
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EP14178146.8A
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German (de)
French (fr)
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EP2829482A1 (en
Inventor
Hans Haug
Marek Hauptmann
Jens-Peter Prof. Dr. Majschak
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.)
TU Dresden
Technische Universitaet Dresden
Pester Pac Automation GmbH
Original Assignee
TU Dresden
Technische Universitaet Dresden
Pester Pac Automation GmbH
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Publication of EP2829482A1 publication Critical patent/EP2829482A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/26—Folding sheets, blanks or webs
    • B31B50/44—Folding sheets, blanks or webs by plungers moving through folding dies
    • 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
    • B65B47/00—Apparatus or devices for forming pockets or receptacles in or from sheets, blanks, or webs, comprising essentially a die into which the material is pressed or a folding die through which the material is moved
    • B65B47/04—Apparatus or devices for forming pockets or receptacles in or from sheets, blanks, or webs, comprising essentially a die into which the material is pressed or a folding die through which the material is moved by application of mechanical pressure
    • B65B47/06—Apparatus or devices for forming pockets or receptacles in or from sheets, blanks, or webs, comprising essentially a die into which the material is pressed or a folding die through which the material is moved by application of mechanical pressure using folding dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/59—Shaping sheet material under pressure
    • B31B50/592—Shaping sheet material under pressure using punches or dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/0077—Shaping by methods analogous to moulding, e.g. deep drawing techniques
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/008—Shaping of tube ends, e.g. flanging, belling, closing, rim-rolling or corrugating; Fixing elements to tube ends
    • B31F1/0087—Rim-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/36—Moistening and heating webs to facilitate mechanical deformation and drying deformed webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/74—Auxiliary operations
    • B31B50/741—Moistening; Drying; Cooling; Heating; Sterilizing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/74—Auxiliary operations
    • B31B50/88—Printing; Embossing

Definitions

  • the invention relates to a method for three-dimensional forming of sheet material, in particular natural fibers, such. Paper or cardboard, with a piston and a box-shaped opposite, into which the material is drawn.
  • a calibration device in which the deformed material is pressed against the piston.
  • the resulting small wrinkles during forming can be equalized in a simple manner.
  • a particularly advantageous embodiment of the invention is that the fold holder presses with a variable pressure against the sheet material.
  • the pressure acting on the sheet material of the pleat holder is controlled or regulated.
  • An advantageous further embodiment of the invention is characterized in that in the axial direction of the piston, a counter punch is provided, which presses the material during the forming against the piston, wherein the counter punch can be made variable and adjustable.
  • the material is reliably guided during forming, so that no uncontrolled movements of the material can occur.
  • the holding force can be set very accurately.
  • the material is moistened at least on one side before, during and / or after forming and / or calibrating.
  • the material is heated before, during and / or after the forming and / or before and / or during the calibration.
  • the temperature and / or the processing moisture of the material is selected or adjusted depending on the material used.
  • a further advantageous embodiment of the invention is characterized in that the bottom of the formed during forming part between the piston and counter-punch is coined.
  • different imprints can be provided; so the floor can be shaped out of the plane or patterned.
  • they provide Embossing geometries for additional stabilization of the drawn part. Deviations from the intended shape contour of the drawn part are minimized.
  • a further advantageous embodiment of the invention is that the material is or will be provided at least on one side with a plastic layer.
  • the fibrous material is effectively protected against internal and / or external influences.
  • a further advantageous embodiment of the invention is characterized in that the part formed during forming is selectively expanded at its open end.
  • the open end is transferred to a sealing edge.
  • the created container can be closed after its filling in a simple manner.
  • the sealing edge is additionally compacted, wherein the densification can take place with the supply of heat and / or after previous moistening.
  • 1 denotes a device with which paper or cardboard or fiber-containing material 2 can be converted from a flat state into a cup or dish-shaped state.
  • the device 1 has a piston 3 and a sleeve-shaped opposite 4, in which the material 2 is pressed by the piston 3.
  • the material 2 is pressed by a fold holder 5 against the bush-shaped opposite 4, so that it only slips in a controlled manner when entering the opposite 4. This ensures that only small wrinkles occur in the material when forming the wall area.
  • the fold holder can spring loaded against the sheet material 2 press. But it is also possible to provide a hydraulic, electromechanical or other contact pressure, which is configured controllable or adjustable. A combination between spring load and controlled or regulated hydraulic / pneumatic / actuators is also conceivable.
  • the embossing takes place by the piston 3 and the counter punch 6 before the actual forming process.
  • the piston 3 and counter punch 6 can already close under Faltenhalterkraft and bring in the embossing. In this case, a drawing operation is performed against the actual pulling forming, whereby the scope is expanded in terms of degree of deformation and design of the soil.
  • the formed part 7 is moved in a calibration device 8 from the piston 3, where the wall portion is pressed against the piston 3 and thereby the small and finely divided wrinkles formed are equalized.
  • the upper wall area can be widened.
  • the upper edge of the part 7 can be reshaped, either in a flat sealing edge or in a mouth roll
  • the material 2 can be moistened before forming or even during this process one or both sides.
  • a heating is possible, with a radiant heater for the material or heating of the forming tools is conceivable.
  • a coating of the material, for example, with a plastic is also possible to improve the tightness of the finished part 7, wherein this coating can be made inside or outside or on both sides.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)

Description

Die Erfindung bezieht sich auf ein Verfahren zum dreidimensionalen Umformen von flächigem Material aus insbesondere Naturfasern, wie z.B. Papier oder Karton, mit einem Kolben und einem büchsenförmigen Gegenteil, in welches das Material hinein gezogen wird.The invention relates to a method for three-dimensional forming of sheet material, in particular natural fibers, such. Paper or cardboard, with a piston and a box-shaped opposite, into which the material is drawn.

Bei derartigen Umformverfahren bilden sich unkontrollierte Falten in unterschiedlicher Größe, die im Nachhinein nicht mehr korrigierbar sind, aber das Erscheinungsbild des fertigen Gegenstandes und eventuell sogar die Formstabilität, Festigkeit und Dichtigkeit im Randbereich erheblich beeinträchtigen.In such forming processes uncontrolled wrinkles form in different sizes, which are no longer correctable in retrospect, but significantly affect the appearance of the finished article and possibly even the dimensional stability, strength and tightness in the edge region.

Dokument US4576566A offenbart ein Verfahren gemäß dem Oberbegriff des Anspruchs 1. Der Erfindung liegt die Aufgabe zugrunde, ein Umform-Verfahren vorzuschlagen, mit dem diese unkontrollierte Faltenbildung vermieden wird. Zudem wird eine Möglichkeit geschaffen, eine komplexe Endkontur mit erhöhtem Umformverhältnis formstabil und formhaltig herzustellen.document US4576566A discloses a method according to the preamble of claim 1. The invention has for its object to propose a forming method with which this uncontrolled wrinkling is avoided. In addition, a possibility is created to produce a complex final contour with increased forming ratio dimensionally stable and dimensionally stable.

Diese Aufgabe wird erfindungsgemäß durch die im kennzeichnenden Teil des Anspruchs 1 enthaltenen Merkmale gelöst. Durch das Einklemmen des Material-Zuschnittes mittels des Faltenhalters werden beim Umformen gleichmäßig verteilte kleine Falten gebildet, die verpresst werden können und damit nicht stören.This object is achieved by the features contained in the characterizing part of claim 1. By clamping the material blank by means of the fold holder evenly distributed small wrinkles are formed during forming, which can be pressed and thus do not interfere.

Erfindungsgemäß ist eine Kalibriereinrichtung vorgesehen, in welcher das umgeformte Material gegen den Kolben gepresst wird.According to the invention, a calibration device is provided, in which the deformed material is pressed against the piston.

Dadurch können die beim Umformen entstehenden kleinen Falten auf einfache Weise egalisiert werden.As a result, the resulting small wrinkles during forming can be equalized in a simple manner.

Eine besonders vorteilhafte Ausgestaltung der Erfindung liegt darin, dass der Faltenhalter mit einem variablen Druck gegen das flächige Material drückt.A particularly advantageous embodiment of the invention is that the fold holder presses with a variable pressure against the sheet material.

Damit kann die Wirkung des Faltenhalters und damit die Entstehung der kleinen Falten gezielt gesteuert werden.Thus, the effect of the wrinkle holder and thus the emergence of small wrinkles can be controlled specifically.

Dabei kann gemäß einer weiteren Ausgestaltung der Erfindung in vorteilhafter Weise der Faltenhalter federbelastet gegen das flächige Material drücken.In this case, according to a further embodiment of the invention advantageously the fold holder spring-loaded press against the sheet material.

Auch ist es im Rahmen der Erfindung möglich, dass der gegen das flächige Material wirkende Druck des Faltenhalters Steuer- bzw. regelbar ist.It is also possible in the context of the invention that the pressure acting on the sheet material of the pleat holder is controlled or regulated.

Sowohl die Federbelastung als auch die Steuer- bzw. Regelbarkeit können dabei in vorteilhafter Weise kombiniert werden.Both the spring load and the controllability or controllability can be combined in an advantageous manner.

Eine vorteilhafte weitere Ausgestaltung der Erfindung ist, dadurch gekennzeichnet, dass in Achsrichtung zum Kolben ein Gegenstempel vorgesehen ist, welcher das Material während des Umformens gegen den Kolben drückt, wobei der Gegenstempel variabel und regelbar ausgebildet sein kann.An advantageous further embodiment of the invention is characterized in that in the axial direction of the piston, a counter punch is provided, which presses the material during the forming against the piston, wherein the counter punch can be made variable and adjustable.

Dadurch wird das Material beim Umformen zuverlässig geführt, so dass keine unkontrollierten Bewegungen des Materials eintreten können. Die Haltekraft kann sehr genau eingestellt werden.As a result, the material is reliably guided during forming, so that no uncontrolled movements of the material can occur. The holding force can be set very accurately.

Als sehr vorteilhaft hat es sich erwiesen, wenn gemäß einer weiteren Ausgestaltung der Erfindung das Material vor, während und/oder nach dem Umformen und/oder Kalibrieren wenigstens einseitig angefeuchtet wird.It has proven to be very advantageous if, according to a further embodiment of the invention, the material is moistened at least on one side before, during and / or after forming and / or calibrating.

Durch dieses Anfeuchten wird die Umformbarkeit und Kalibrierbarkeit des Materials ganz erheblich verbessert.This moistening considerably improves the formability and calibratability of the material.

Gemäß einer vorteilhaften weiteren Ausgestaltung der Erfindung ist vorgesehen, dass das Material vor, während und/oder nach dem Umformen und/oder vor und/oder während dem Kalibrieren beheizt wird.According to an advantageous further embodiment of the invention, it is provided that the material is heated before, during and / or after the forming and / or before and / or during the calibration.

Auch hierdurch wird die Umformbarkeit und Kalibrierbarkeit des Materials erheblich gesteigert.This also considerably improves the formability and calibratability of the material.

Dabei hat es sich als sehr vorteilhaft erwiesen, wenn gemäß einer weiteren Ausgestaltung der Erfindung die Temperatur und/oder die Verarbeitungsfeuchte des Materials abhängig vom verwendeten Material gewählt bzw. eingestellt wird.It has proved to be very advantageous if, according to a further embodiment of the invention, the temperature and / or the processing moisture of the material is selected or adjusted depending on the material used.

Eine weitere vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass der Boden des beim Umformen gebildeten Teils zwischen dem Kolben und Gegenstempel geprägt wird.A further advantageous embodiment of the invention is characterized in that the bottom of the formed during forming part between the piston and counter-punch is coined.

Dabei können unterschiedliche Prägungen vorgesehen werden; so kann der Boden aus der Ebene heraus geformt oder mit Mustern versehen werden. Zudem sorgen diese Prägegeometrien für eine zusätzliche Stabilisierung des Ziehteils. Abweichungen von der vorgesehenen Formkontur des Ziehteils werden minimiert.In this case, different imprints can be provided; so the floor can be shaped out of the plane or patterned. In addition, they provide Embossing geometries for additional stabilization of the drawn part. Deviations from the intended shape contour of the drawn part are minimized.

Eine weitere vorteilhafte Ausgestaltung der Erfindung liegt darin, dass das Material wenigstens einseitig mit einer Kunststoffschicht versehen ist oder wird.A further advantageous embodiment of the invention is that the material is or will be provided at least on one side with a plastic layer.

Damit ist das faserhaltige Material gegen innere und/oder äußere Einflüsse wirksam geschützt.Thus, the fibrous material is effectively protected against internal and / or external influences.

Sehr günstig ist es auch, wenn gemäß einer weiteren Ausgestaltung der Erfindung die sich beim Umformen bildenden feinverteilten Falten verpresst werden.It is also very favorable if, according to a further embodiment of the invention, the finely divided folds forming during forming are pressed.

Damit kann eine sehr glatte Oberfläche des umgeformten Teils erzielt werden.Thus, a very smooth surface of the formed part can be achieved.

Eine weitere vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass das beim Umformen gebildete Teil an seinem offenen Ende gezielt aufgeweitet wird.A further advantageous embodiment of the invention is characterized in that the part formed during forming is selectively expanded at its open end.

Durch diese gezielte Aufweitung kann ein Behälter geschaffen werden, der sich gegen den oberen Rand erweitert. Zudem weist der Behälter dennoch mit nicht aufgeweiteten Behältern vergleichbare Randqualitäten auf.By this targeted expansion, a container can be created, which widens against the upper edge. In addition, the container still has with non-expanded containers comparable edge qualities.

Sehr vorteilhaft ist es auch, wenn gemäß einer weiteren Ausgestaltung der Erfindung das offene Ende zu einem Siegelrand umgelegt wird.It is also very advantageous if, according to a further embodiment of the invention, the open end is transferred to a sealing edge.

Damit kann der geschaffene Behälter nach seinem Befüllen auf einfache Weise verschlossen werden.Thus, the created container can be closed after its filling in a simple manner.

Äußerst vorteilhaft ist es erfindungsgemäß auch, wenn der Siegelrand zusätzlich verdichtet wird, wobei die Verdichtung unter Zufuhr von Wärme und/oder nach vorangehendem Anfeuchten erfolgen kann.According to the invention, it is also extremely advantageous if the sealing edge is additionally compacted, wherein the densification can take place with the supply of heat and / or after previous moistening.

Hierdurch wird ein sehr glatter und gleichmäßiger Siegelrand geschaffen, der auch gute Festigkeitswerte aufweist.This creates a very smooth and uniform sealing edge, which also has good strength values.

Es sind jedoch auch andere Ausgestaltungen des offenen Endes denkbar; beispielsweise ist die Bildung einer sogenannten Mundrolle möglich.However, other embodiments of the open end are conceivable; For example, the formation of a so-called mouth roll is possible.

In der Zeichnung ist die Erfindung anhand eines Ausführungsbeispiels veranschaulich. Dabei zeigt die Figur:
eine schematische Darstellung des Ablaufs des erfindungsgemäßen VerfahrensIn the drawing, the invention by way of example is illustrative. The figure shows:
a schematic representation of the sequence of the method according to the invention

Mit 1 ist eine Vorrichtung bezeichnet, mit der Papier oder Karton bzw. faserhaltiges Material 2 von einem flachliegenden Zustand in einen becher- oder schalenförmigen Zustand umgeformt werden kann.1 denotes a device with which paper or cardboard or fiber-containing material 2 can be converted from a flat state into a cup or dish-shaped state.

Die Vorrichtung 1 weist einen Kolben 3 sowie ein büchsenförmiges Gegenteil 4 auf, in welches des Material 2 vom Kolben 3 hineingedrückt wird. Dabei wird das Material 2 von einem Faltenhalter 5 gegen das büchsenförmigen Gegenteil 4 gepresst, so dass es beim Einfahren in das Gegenteil 4 nur kontrolliert nachrutscht. Dadurch wird gewährleistet, dass beim Umformen des Wandbereiches nur kleine Falten im Material entstehen.The device 1 has a piston 3 and a sleeve-shaped opposite 4, in which the material 2 is pressed by the piston 3. In this case, the material 2 is pressed by a fold holder 5 against the bush-shaped opposite 4, so that it only slips in a controlled manner when entering the opposite 4. This ensures that only small wrinkles occur in the material when forming the wall area.

Der Faltenhalter kann dabei federbelastet gegen das flächige Material 2 drücken. Es ist aber auch möglich eine hydraulische, elektromechanische oder anderweitige Anpressung vorzusehen, die steuer- bzw. regelbar ausgestaltet ist. Eine Kombination zwischen Federbelastung und gesteuerter bzw. geregelter Hydraulik / Pneumatik / Aktuatoren ist ebenfalls denkbar.The fold holder can spring loaded against the sheet material 2 press. But it is also possible to provide a hydraulic, electromechanical or other contact pressure, which is configured controllable or adjustable. A combination between spring load and controlled or regulated hydraulic / pneumatic / actuators is also conceivable.

Ein Gegenstempel 6, der in Achsrichtung des Kolbens 3 angeordnet ist, drückt von unten her gegen das Material 2, so dass kein Material aus dem Bodenbereich in den umzuformenden Wandbereich fließen kann. Es ist jedoch möglich, dass das Material 2 im Bodenbereich zwischen dem Kolben 3 und dem Gegenstempel 6 selbst umgeformt wird. Es ist in diesem Zusammenhang auch denkbar, daß die Prägung durch den Kolben 3 und den Gegenstempel 6 vor dem eigentlichen Umformvorgang erfolgt. Dabei können Kolben 3 und Gegenstempel 6 bereits unter Faltenhalterkraft schließen und die Prägung einbringen. Dabei wird ein Ziehvorgang entgegen der eigentlichen ziehenden Umformung vorgenommen, wodurch der Spielraum hinsichtlich Umformgrad und Ausgestaltung des Bodens erweitert wird.A counter punch 6, which is arranged in the axial direction of the piston 3, presses from below against the material 2, so that no material from the bottom area can flow into the wall area to be formed. However, it is possible that the material 2 in the bottom area between the piston 3 and the counter punch 6 itself is formed. It is also conceivable in this context that the embossing takes place by the piston 3 and the counter punch 6 before the actual forming process. Here, the piston 3 and counter punch 6 can already close under Faltenhalterkraft and bring in the embossing. In this case, a drawing operation is performed against the actual pulling forming, whereby the scope is expanded in terms of degree of deformation and design of the soil.

Nach dem Umformen wird das gebildete Teil 7 in eine Kalibriereinrichtung 8 vom Kolben 3 bewegt, wo der Wandbereich gegen den Kolben 3 gepresst wird und dabei die gebildeten kleinen und feinverteilten Falten egalisiert werden.After forming, the formed part 7 is moved in a calibration device 8 from the piston 3, where the wall portion is pressed against the piston 3 and thereby the small and finely divided wrinkles formed are equalized.

Während dieses Kalibrierens kann der obere Wandbereich aufgeweitet werden.During this calibration, the upper wall area can be widened.

Nach dem Kalibrieren wird das fertig umgeformte Teil 7 nach dem Hochfahren des Kolbens 3 vom Gegenstempel 6 ausgestoßen.After calibrating the finished formed part 7 is ejected after the raising of the piston 3 from the counter punch 6.

Vorher oder auch anschließend kann noch der obere Rand des Teils 7 umgeformt werden, entweder in einen flachen Siegelrand oder auch in eine MundrolleBefore or afterwards, the upper edge of the part 7 can be reshaped, either in a flat sealing edge or in a mouth roll

Zur Verbesserung des Umformergebnisses kann das Material 2 vor dem Umformen oder auch während dieses Prozesses ein oder beidseitig angefeuchtet werden.To improve the Umformergebnisses the material 2 can be moistened before forming or even during this process one or both sides.

Auch eine Beheizung ist möglich, wobei eine Strahlungsheizung für das Material oder eine Beheizung der Umform-Werkzeuge denkbar ist.A heating is possible, with a radiant heater for the material or heating of the forming tools is conceivable.

Eine Beschichtung des Materials beispielsweise mit einem Kunststoff ist zur Verbesserung der Dichtigkeit des fertigen Teils 7 ebenfalls möglich, wobei diese Beschichtung innen oder außen oder auch beidseitig vorgenommen werden kann.A coating of the material, for example, with a plastic is also possible to improve the tightness of the finished part 7, wherein this coating can be made inside or outside or on both sides.

Claims (13)

  1. Method for three-dimensional reshaping of flat material (2) of, in particular, natural fibres such as, for example, paper or cardboard, comprising a piston (3) and a bush-shaped counter member (4), into which the material (2) is drawn, wherein the material (2) is clamped in place between the bush-shaped counter member (4) and a so-called fold retainer (5), whereby the material (2) can selectively slip during the reshaping, characterised in that a calibrating device (8) in which the reshaped material (2) is pressed against the piston (3) is provided so that the finely-distributed folds forming during the reshaping are compressed.
  2. Method according to claim 1, characterised in that the fold retainer (5) presses against the flat material (2) with a variable pressure.
  3. Method according to claim 1 or 2, characterised in that the fold retainer (5) is pressed under spring-loading against the flat material (2).
  4. Method according to claim 1, 2 or 3, characterised in that the pressure of the fold retainer (5) acting against the fiat material (2) is controllable or regulable.
  5. Method according to any one of the preceding claims, characterised in that a counter die (6) which presses the material (2) against the piston (3) during the reshaping is provided in axial direction with respect to the piston (3), wherein the counter die (6) can be constructed to be variable and regulable.
  6. Method according to any one of the preceding claims, characterised in that the material (2) is moistened at at least one side before, during and/or after the reshaping and/or calibration.
  7. Method according to any one of the preceding claims, characterised in that the material (2) is heated before, during and/or after the reshaping and/or before and/or during the calibration.
  8. Method according to claim 6 or 7, characterised in that the temperature and/or the processing moisture of the material (2) is or are selected or set in dependence on the material used.
  9. Method according to any one of the preceding claims, characterised in that the base of the part formed during the reshaping is stamped between the piston (3) and counter die (6).
  10. Method according to any one of the preceding claims, characterised in that the material (2) is provided on at least one side with a plastics material coating.
  11. Method according to any one of the preceding claims, characterised in that the part formed during the reshaping is selectively widened at its open end.
  12. Method according to claim 11, characterised in that the open end is folded over to form a sealing edge.
  13. Method according to claim 12, characterised in that the sealing edge is additionally compressed, wherein the compression is carried out under the application of heat and/or after preceding moistening.
EP14178146.8A 2013-07-24 2014-07-23 Process for three-dimensional forming of flat material Active EP2829482B1 (en)

Applications Claiming Priority (1)

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DE102013107932.6A DE102013107932A1 (en) 2013-07-24 2013-07-24 Method for three-dimensional forming of sheet material

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