EP0480839A1 - 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 PDFInfo
- Publication number
- EP0480839A1 EP0480839A1 EP91402713A EP91402713A EP0480839A1 EP 0480839 A1 EP0480839 A1 EP 0480839A1 EP 91402713 A EP91402713 A EP 91402713A EP 91402713 A EP91402713 A EP 91402713A EP 0480839 A1 EP0480839 A1 EP 0480839A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- paper pulp
- during
- manufacturing parts
- drying
- 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
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Classifications
-
- 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 to manufacture in particular toys, sculptures, decorations of objects, displays and / or packaging for cosmetic products, perfumes, drugs, food products, as well as parts that 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 forming 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.
- the present invention aims to remedy these drawbacks, and to provide various advantages, in particular consisting in significantly simplifying the processing device, in proposing a mold which can be executed quickly, generally within 24 hours, in allowing the production of pieces of any dimensions and may have undercuts and allow economical and easy implementation of the drying step, through the use of means in common with those used to shape the parts.
- the mold is fixed and substantially horizontal, the internal part of the mold being directed upwards.
- an overpressure on the outside of the mold relative to the inside of the mold is maintained at room temperature.
- 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 drawn 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 device with suction cup, 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 pulp. In the latter case, parts dyed in the mass are thus obtained.
- the molded parts can be metallized.
- the method of manufacturing the parts 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.
- the mold is made of a porous and non-hydrophilic material.
- the material resists thermal shocks 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 added 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 in.
- 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 shade 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 step 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.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Paper (AREA)
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 true EP0480839A1 (de) | 1992-04-15 |
| EP0480839B1 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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2711622A1 (fr) * | 1993-10-27 | 1995-05-05 | Anacellulose | Elément de protection contre les chocs, procédé de fabrication et dispositif pour la mise en Óoeuvre du procédé. |
Citations (7)
| 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 |
| WO1990004678A1 (en) * | 1988-10-25 | 1990-05-03 | Brødrene Hartmann A/S | Method for the manufacture of contour-stable objects |
-
1990
- 1990-10-12 FR FR9012647A patent/FR2667882B1/fr not_active Expired - Fee Related
-
1991
- 1991-10-10 ES ES91402713T patent/ES2080273T3/es not_active Expired - Lifetime
- 1991-10-10 DE DE69113203T patent/DE69113203T2/de not_active Expired - Fee Related
- 1991-10-10 AT AT91402713T patent/ATE128202T1/de not_active IP Right Cessation
- 1991-10-10 EP EP91402713A patent/EP0480839B1/de not_active Expired - Lifetime
- 1991-10-11 JP JP3263898A patent/JPH04263700A/ja active Pending
Patent Citations (7)
| 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 |
| WO1990004678A1 (en) * | 1988-10-25 | 1990-05-03 | Brødrene Hartmann A/S | Method for the manufacture of contour-stable objects |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2711622A1 (fr) * | 1993-10-27 | 1995-05-05 | Anacellulose | Elément de protection contre les chocs, procédé de fabrication et dispositif pour la mise en Óoeuvre du procédé. |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0480839B1 (de) | 1995-09-20 |
| FR2667882B1 (fr) | 1993-01-22 |
| JPH04263700A (ja) | 1992-09-18 |
| FR2667882A1 (fr) | 1992-04-17 |
| DE69113203D1 (de) | 1995-10-26 |
| DE69113203T2 (de) | 1996-08-01 |
| ATE128202T1 (de) | 1995-10-15 |
| ES2080273T3 (es) | 1996-02-01 |
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