EP0480839B1 - Verfahren zur Herstellung von aus Papiermasse geformten Gegenständen und Vorrichtung zu dessen Durchführung - Google Patents

Verfahren zur Herstellung von aus Papiermasse geformten Gegenständen und Vorrichtung zu dessen Durchführung Download PDF

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Publication number
EP0480839B1
EP0480839B1 EP91402713A EP91402713A EP0480839B1 EP 0480839 B1 EP0480839 B1 EP 0480839B1 EP 91402713 A EP91402713 A EP 91402713A EP 91402713 A EP91402713 A EP 91402713A EP 0480839 B1 EP0480839 B1 EP 0480839B1
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EP
European Patent Office
Prior art keywords
mould
stage
paper pulp
mold
manufacture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91402713A
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English (en)
French (fr)
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EP0480839A1 (de
Inventor
Yves Amson
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.)
Anacellulose Ste
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Anacellulose Ste
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Publication date
Application filed by Anacellulose Ste filed Critical Anacellulose Ste
Publication of EP0480839A1 publication Critical patent/EP0480839A1/de
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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 present invention relates to a process for manufacturing shaped parts, from paper pulp, and in particular from paper pulp of the quality commonly called "noble pulp” in this industry, the material of these molded parts having substantially the same rigidity. than some cartons.
  • the invention also relates to a device for implementing this method.
  • This process makes it possible in particular to manufacture toys, sculptures, decorations of objects, displays and / or packaging for cosmetic products, perfumes, drugs, food products, as well as parts which can be used in jewelry, hygiene or the arts in the form of packaging, boxes or advertising media.
  • patent US-1 697 244 which is relatively old, relates to a machine for the forming of paper pulp comprising a wheel rotating around a horizontal axis and supporting at its periphery mold holders. At the bottom of this wheel is a container filled with paper pulp.
  • This machine comprises means for maintaining a suction on the molds.
  • a constant and uniform pressure is maintained on the layer of paper pulp placed in the mold, during the deposition of the paper pulp and the drying thereof.
  • the drying is carried out by the aspiration of hot air through the paper pulp and the mold, during the passage of the latter in the drying chamber.
  • Means are provided for supplying pressurized air to the interior of the mold so as to eject the article when dry.
  • Each of the two tools necessary for the implementation of the drying step of the process currently used is of a complex embodiment and must have a shape corresponding to the part to be dried, which entails considerable cost and time for the manufacture of these devices.
  • the mold is, in general, constituted by an imprint, made of a metal grid shaped to the desired part and an element of similar shape but made in particular of a solid metal pierced with holes.
  • This process includes a shaping step, in which paper pulp is applied in a mold to the shape of the part and porous to gases and a drying step, in which heat is brought to the previously shaped part. in the mold, by maintaining a depression on the outside of the mold relative to the inside of the mold, the mold being, during the two stages, fixed and substantially horizontal, the interior part of the mold being directed upwards.
  • the mold is moved between the shaping step and the drying step.
  • a vacuum is applied to the outside of the mold, which causes the deposition of fibers on the perforated walls of the mold.
  • the present invention aims to remedy these drawbacks, and to provide various advantages including notably to significantly simplify the processing device, to provide a mold that can be executed quickly, generally within 24 hours, to allow the production of pieces of any dimensions and may have undercuts and allow an economical and easy implementation of the drying step, through the use of means in common with those used to shape the parts.
  • the invention relates to a method of manufacturing parts from paper pulp, according to which the only one is also fixed from the shaping step to the drying step and during the shaping step, an overpressure on the outside of the mold is maintained at room temperature relative to the inside of the mold.
  • the intensity of the overpressure maintained during the shaping step is chosen so as to obtain a substantially homogeneous and uniform layer of paper pulp inside the mold.
  • heat is added to the room, by infrared radiation.
  • the radiation produces a temperature between 100 ° C and 290 ° C.
  • heat is added to the room by heating gases which are drawn through the room due to the vacuum.
  • the hot gases sucked in during the drying step are at a temperature between 100 ° C and 290 ° C.
  • the shaped part While the shaped part is still in the mold, it is dried either by radiation and gas suction, or by suction of gas previously heated through the mold and the support, so that all the stages of the manufacturing process is done until the molded and dried part is removed from the mold, using the same tool for molding, or shaping, and drying.
  • the piece of paper pulp is demolded by injection of compressed air through the mold, after drying.
  • said parts can, in particular when they are large, be removed from the mold by means of a suction suction device, which allows possibly use the same suction source as for the other process steps.
  • the manufacturing process includes an optional additional step of coloring the molded part by depositing pigments on the surface of the part or by adding pigments in the pulp. In the latter case, parts dyed in the mass are thus obtained.
  • the molded parts can be metallized.
  • the parts manufacturing process includes an optional step of waterproofing by a treatment of resins.
  • the invention also relates to a device for implementing the method which has just been described.
  • This device comprises a substantially horizontal porous mold, the internal part of the mold being directed upwards, means for applying the paper pulp into the mold, means for drying the part previously formed in the mold and means for maintaining a vacuum. on the outside of the mold relative to the inside of the mold when the drying means are actuated.
  • the mold is fixed and made of a non-hydrophilic porous material
  • the device comprising means for maintaining an overpressure on the outside of the mold relative to the inside of the mold when the means for applying the paste are operated.
  • the material resists thermal shock due to the passage of steam when the drying is obtained by suction of hot gases so that the lifetime of the mold is relatively long.
  • This material can be composite.
  • Figures 1 and 2 show, a piece respectively during the shaping step and in the still wet state, then during the suction drying step.
  • the device according to the invention for manufacturing parts from paper pulp essentially comprises a mold 1, placed on a fixed support 2.
  • the mold is arranged substantially horizontally, the inner part 3 of the mold being directed upwards. It is made of a porous gas material.
  • This overpressure makes it possible to prevent the paper pulp from depositing at the bottom of the mold, due to the gravity, and to maintain a uniform and homogeneous layer of paper pulp on the inner part 3 of the mold.
  • a depression is established on the outside 5 of the mold 1 relative to the inside 3 of the mold and heat is applied to the part previously formed in the mold.
  • This depression can for example be obtained by means of a vacuum pump and a conduit opening at the rear of the mold 1.
  • This heat can be brought to the room by infrared radiation.
  • This radiation is produced by an appropriate device which is not shown in the figures. This device produces in particular a temperature between 100 ° and 290 ° C.
  • the radiation value can be appropriately determined so that the part is heated without the mold being heated. This effectively protects the mold from thermal shock.
  • This suction 6 of hot gases can for example be obtained by means of a heating device placed above the mold and heating gases which are sucked in due to the vacuum. This device is not shown in FIG. 2.
  • the gases used are preferably made up of ambient air.
  • the heating device heats the air to a temperature preferably between 100 ° C and 290 ° C, and the hot air 6 is set in motion through the mold 1 and the part 4, shaped in the mold, by said pump mounted at the end of said suction duct, which dries the shaped part 1 which is still in the impression.
  • the paper pulp Due to the vacuum, the paper pulp is fixed in the mold. Indeed, the mold, although not hermetic to the pressure, is impermeable to the paper pulp which cannot therefore be carried further by the depression , and this paste takes the form imposed by the mold, while being dried due to the temperature of the radiation or the air sucked.
  • the mold 1 is preferably made of a non-hydrophilic material.
  • the mold 1 can in particular be made of a composite material to be quickly produced.
  • the process can include an additional step depending on the function assigned to the part, here are some specific examples.
  • the part is colored in an additional step by all types of pigment deposit on the surfaces of said part.
  • the parts obtained have been dyed in the mass by the addition of pigments in the paper pulp, prior to the various stages of the process which have just been described.
  • the parts can be metallized.
  • the color of the molded part can be obtained by spray painting.
  • the process for manufacturing molded parts can include an additional lacquering step with or without baking, which makes it possible to adjust the quality of the surface to the function of the part and to render, in addition, the piece is completely waterproof.
  • the device is very simple compared to known devices.
  • the mold can be changed very quickly, which is advantageous in the technical field targeted by the invention, when the series are small quantities.
  • the mold being arranged so that its lower part is directed upwards, the intensity of the gas suction established during the drying stage is much lower than that which is necessary in the systems with rotating wheel which do not use not gravity.
  • the paper pulp penetrates much less into the internal surface of the mold and it is possible to produce parts having undercuts.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Paper (AREA)

Claims (16)

  1. Verfahren zur Herstellung von aus Papiermasse geformten Gegenständen umfassend:
    1) einen Schritt der Formgebung, bei dem man die Papiermasse in eine gasdurchlässige Form mit der Gestalt des Gegenstandes einbringt, und
    2) einen Schritt des Trocknens, bei dem man dem zuvor in der Form abgeformten Gegenstand Wärme zuführt, wobei man einen Unterdruck auf der Außenseite (5) der Form bezüglich des Inneren (3) der Form aufrechterhält und wobei die Form während der beiden Schritte feststehend und im wesentlichen horizontal ist, wobei der innere Teil (3) der Form nach oben gerichtet ist,
    dadurch gekennzeichnet,
    daß man, während die Form gleichermaßen von dem Schritt der Formgebung bis zu dem Trockenschritt feststehend ist, während des Schritts der Formgebung bei Umgebungstemperatur einen Überdruck auf der Außenseite (5) der Form bezüglich des Inneren (3) der Form (1) aufrechterhält.
  2. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet,
    daß die Höhe des Überdrucks während des Schritts der Formgebung derart gewählt ist, daß eine im wesentlichen homogene und gleichmäßige Papiermassenschicht im Inneren (3) der Form (1) erhalten wird.
  3. Verfahren nach einem der Ansprüche 1 oder 2,
    dadurch gekennzeichnet,
    daß man während des Schritts des Trocknens dem Gegenstand (4) Wärme durch Infrarotstrahlung zuführt.
  4. Verfahren nach Anspruch 3,
    dadurch gekenzeichnet,
    daß die Strahlung eine Temperatur zwischen einschließlich 100°C und 290°C erzeugt.
  5. Verfahren nach einem der Ansprüche 1 oder 2,
    dadurch gekenzeichnet,
    daß man während des Trockenschritts dem Gegenstand (4) Wärme durch Heizen von Gasen zuführt, die durch den Gegenstand wegen des Unterdrucks angesaugt werden.
  6. Verfahren nach Anspruch 5,
    dadurch gekenzeichnet,
    daß die Gase von der Umgebungsluft gebildet werden.
  7. Verfahren nach einem der Ansprüche 5 oder 6,
    dadurch gekenzeichnet,
    daß die heißen Gase (6), die während des Schritts des Trocknens angesaugt werden, eine Temperatur zwischen einschließlich 100°C und 290°C aufweisen.
  8. Verfahren zur Herstellung von Gegenständen nach einem der Ansprüche 1 bis 7,
    dadurch gekenzeichnet,
    daß nach dem Schritt des Trocknens der Gegenstand (4) durch Injektion von Druckluft durch die Form (1) von dieser gelöst wird.
  9. Verfahren zur Herstellung von Gegenständen nach einem der Ansprüche 1 bis 7,
    dadurch gekenzeichnet,
    daß der Gegenstand (4) nach dem Schritt des Trocknens von der Form (1) mittels einer Saugnapf-Ansaugvorrichtung gelöst wird.
  10. Verfahren zur Herstellung von Gegenständen nach einem der Ansprüche 1 bis 9,
    dadurch gekennzeichnet,
    daß es einen zusätzlichen Schritt des Färbens des abgeformten Gegenstandes (4) durch Niederschlag von Pigmenten auf der Oberfläche des Gegenstandes umfaßt.
  11. Verfahren zur Herstellung von Gegenständen nach einem der Ansprüche 1 bis 9,
    dadurch gekennzeichnet,
    daß es einen zusätzlichen Schritt des Durchfärbens der Masse des Gegenstandes (4) durch Beigabe von Pigmenten in die Papiermasse umfaßt.
  12. Verfahren zur Herstellung von Gegenständen nach einem der vorhergehenden Ansprüche 1 bis 11,
    dadurch gekennzeichnet,
    daß es einen zusätzlichen Schritt der Metallisierung der Oberfläche des glattgeformten Gegenstandes (4) umfaßt.
  13. Verfahren zur Herstellung Von Gegenständen nach einem der Ansprüche 1 bis 12,
    dadurch gekennzeichnet,
    däß es weiterhin einen Schritt des Imprägnierens der Gegenstände (4) durch Behandlung mit Kunstharzen umfaßt.
  14. Vorrichtung zur Ausübung des Verfahrens nach einem der Ansprüche 1 bis 13, welche eine poröse, im wesentlichen horizontale Form (1) umfaßt, wobei der innere Teil (3) der Form (1) nach oben gerichtet ist, Mittel zum Aufbringen der Papiermasse in die Form umfaßt, Mittel zum Trocknen des zuvor in der Form abgeformten Gegenstands umfaßt sowie Mittel zum Aufrechthalten eines Unterdrucks auf der Außenseite (5) der Form (1) bezüglich des Inneren (3) der Form (1) umfaßt, wenn die Trockenmittel betätigt sind,
    dadurch gekenzeichnet,
    daß die Form (1) feststehend ist und aus einem porösen, nicht hydrophilen Material besteht, daß die Vorrichtung Mittel zum Aufrechterhalten eines Überdrucks auf der Außenseite (5) der Form (1) bezüglich des Inneren (3) der Form (1), wenn die Mittel zum Aufbringen der Masse betätigt sind, umfaßt.
  15. Vorrichtung nach Anspruch 14,
    dadurch gekenzeichnet,
    daß das Material Wärmeschocks widersteht und nicht oxydiert.
  16. Vorrichtung nach einem der Ansprüche 14 oder 15,
    dadurch gekenzeichnet,
    daß das Material Komposit-Material ist.
EP91402713A 1990-10-12 1991-10-10 Verfahren zur Herstellung von aus Papiermasse geformten Gegenständen und Vorrichtung zu dessen Durchführung Expired - Lifetime EP0480839B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9012647A FR2667882B1 (fr) 1990-10-12 1990-10-12 Procede de fabrication de pieces conformees a partir de pate a papier et dispositif pour sa mise en óoeuvre.
FR9012647 1990-10-12

Publications (2)

Publication Number Publication Date
EP0480839A1 EP0480839A1 (de) 1992-04-15
EP0480839B1 true EP0480839B1 (de) 1995-09-20

Family

ID=9401190

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91402713A Expired - Lifetime EP0480839B1 (de) 1990-10-12 1991-10-10 Verfahren zur Herstellung von aus Papiermasse geformten Gegenständen und Vorrichtung zu dessen Durchführung

Country Status (6)

Country Link
EP (1) EP0480839B1 (de)
JP (1) JPH04263700A (de)
AT (1) ATE128202T1 (de)
DE (1) DE69113203T2 (de)
ES (1) ES2080273T3 (de)
FR (1) FR2667882B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2711622B1 (fr) * 1993-10-27 1996-01-12 Anacellulose Elément de protection contre les chocs, procédé de fabrication et dispositif pour la mise en Óoeuvre du procédé.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB359950A (en) * 1930-07-21 1931-10-21 Flintkote Co Improvements in and relating to moulded, waterproof fibrous products and process forthe manufacture of same
FR760653A (fr) * 1932-09-10 1934-02-28 Baumgartner Procédé et dispositif pour la fabrication de corps en pâte fibreuse
US2741165A (en) * 1952-12-13 1956-04-10 Western Pulp Products Pulp molding machine
DE1061670B (de) * 1955-04-07 1959-07-16 Hausser O & M Verfahren zur Herstellung von Hohlkoerpern figuerlicher Ausbildung aus formbarer feuchtigkeitshaltiger Masse
US3271239A (en) * 1964-01-23 1966-09-06 Beloit Corp Process of forming a water-laid fibrous article containing a c2-c3 polyalkylene resin
GB2074085A (en) * 1980-03-19 1981-10-28 Telford Safety Glove Co Ltd Moulding fibrous gloves
DK168020B1 (da) * 1988-10-25 1994-01-17 Hartmann As Brdr Fremgangsmaade til fremstilling af formstabile genstande ud fra et fluidiseret cellulosefiberraastof

Also Published As

Publication number Publication date
DE69113203D1 (de) 1995-10-26
JPH04263700A (ja) 1992-09-18
FR2667882A1 (fr) 1992-04-17
FR2667882B1 (fr) 1993-01-22
EP0480839A1 (de) 1992-04-15
ES2080273T3 (es) 1996-02-01
DE69113203T2 (de) 1996-08-01
ATE128202T1 (de) 1995-10-15

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