CA2245946A1 - A method of manufacturing relief patterned sheet-like products - Google Patents
A method of manufacturing relief patterned sheet-like products Download PDFInfo
- Publication number
- CA2245946A1 CA2245946A1 CA002245946A CA2245946A CA2245946A1 CA 2245946 A1 CA2245946 A1 CA 2245946A1 CA 002245946 A CA002245946 A CA 002245946A CA 2245946 A CA2245946 A CA 2245946A CA 2245946 A1 CA2245946 A1 CA 2245946A1
- Authority
- CA
- Canada
- Prior art keywords
- sheet
- products
- wood
- patterned
- press
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/20—Moulding or pressing characterised by using platen-presses
- B27N3/203—Moulding or pressing characterised by using platen-presses with heating or cooling means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
Sheet-like products comprising a fibrous material, such as sawdust, wood chippings or wood powder, and a thermoplastic glue can be provided with a relief pattern by compression moulding the products in a pressure-cell press.
Description
CA 02245946 l998-08-ll A Method Of Manufacturin~ Relief Patterned Sheet-Like Products The present invention relates to m~nllf;lc*-rin~ relief patterned sheet-like products.
Examples of such sheet-like products are doors, cupboard doors, patterned woodenpanels, and so on. The products are produced from materials that have thermoplastic properties, preferably materials that contain wood-fibre based material.
Relief patterned sheet-like products, such as kitchen cupboard doors, patterned panels, doors, etc., are in great ~lem~nd Such products are typically produced from a wooden sheet into which the pattern is cut. ~ltPrn~1ively, pre-shaped wooden blanks or preforms can be fastened onto one surface of the sheet. It is also known to combine these two techniques.
The work involved in providing sheet-like products with a relief pattern, which is done m~nu~lly to a large extent, is expensive, time consuming and requires a high degree of expertise. Co~equently, there is a need of less complicated and cheaper methods of producing relief patterned sheet-like products.
When compression moulding particle boardj for instance, in a mould that has steep transitions between raised and sunken parts, a poor result is obtained due to the ease in which the board cracks. The board may even break in some cases.
WO 82/03595 teaches an ~pal~Lus and a method for producing patterned wood-fibre board which is intended mainly for use as a sound-in~ tin~ wall coveTing. According to this method, a wet wood-fibre pulp is formed with the aid of a patterned roll and then dried. When pr~c~in~. this known method, the board is patterned in the stage of its manufacture. C~onseqllPntly, it is necessa~y to make large investments and to apply a complicated process when wishing to use this technique.
EP 0 489 994 describes a door that is provided with one or layers of relief-patterned thermoplastic material. In this case, the actual wood has not been forrned or shaped CA 02245946 1998-08-ll W 097/28937 2 PCT/SE97/~0137 and there is used a pre-formed sheet of another material. Different areas of the surface are produced from different m~t~-ris~l with this technique. Furthermore, the technique is not suitable for producing sheet-like products that are patterned with sunken surfaces.
EP 0 574 953 teaches a method of producing relief-patterned wood-composite sheets, wherein the sheets may be formed with va~ious different patterns at the same time. The press time is relatively long (about 5 min.), which results in relatively high m~nllf~cturing costs. Furthermore, the patterned sheets have a relatively small surface size (20 x 20 inches).
There is thus a need of ~ltern~1;ve methods for pro~ cin~ relief-patterned sheet-like products with which the aforesaid problems are resolved and which enable sheets having a surface area of at least 1.5--2m2 to be pressed.
Summary of the Invention It has now been found that a relief-p~ttPrned sheet-like product of good quality can be produced quickly and simply by compression-moulding a sheet-like pre-form that includes a mixture of fibrous m~teri~l and thermoplastic glue in a press of the pressure cell type.
The invention will now be described in more detail with reference to the accompanying drawing, in which Figure 1 illustrates an example of a board pattern that can be produced by the inventive method; and Figure 2 is a cross-sectional view of the patterned board shown in Figure 2.
i W 0 97/28937 3 PCT/SE97tO0137 Detailed Description of the Invention By using a pressure-cell type press, it is possible to achieve effects that cannot be achieved with a conventional piston-type press. In a pressure-cell press, pressure is transferred by an elastic membrane. The blank is therewith pressed in many directions ~iml-lt~neously, which enables the blank to be shaped quickly and readily in accordance with the shape of an underlying moulding tool. This enables the compression moulded product to be provided with very complicated p~ttPrn~ Suitable blanks can also be pressed at very high pressures, about 800 bars and preferably in excess of 1000 bars, therewith achieving very short press times, e.g. press times below two minlltes, preferably below one mimlte SE-C-452 436 describes a pressure-cell type plant which is well-suited for use in conjunction with the method for producing relief-patterned sheet-like products in accordance with the invention. This press is designed for the m~mlf~ lre of not-readily shaped sheet-metal elP.me.nt~ A hard shaping tool is placed in the bottom of a tray and the blank or preform to be pressed is placed on top of the tool. The tray is pushed into the press and the blank then pressed against the shaping tool by means of an elastic membrane, for instance an hydraulically operated membrane.
If a sheet of fibrous material, for instance particle board, that contains no thermoplastic ~lue is compression moulded at high pressure with the aid of a pressure-cell press and a hard shaping tool, the sheet will buckle or collapse. Because thermoplastic glue is a cold flowing glue, these problems do not occur as readily when compression moulding a sheet of fibrous material that includes such glue. The pressing properties of such a sheet can also be enhanced by heating the sheet. The person skilled in this art will be able to establish appropriate press temperatures for different glue sorts~ with the aid of simple tests.
According to the invention, the shapability of the fibrous sheet can be further enhanced, by heating the sheet to a temperature of 40-70~C, preferably to 45-60~C, prior to pressing. The sheet may be heated conveniently in a microwave oven.
The fibrous m~te.risll is preferably a wood-fibre based material, such as sawdust, wood chippings or wood powder, and so on. Suitable thermoplastic glues are polymer glues, for instance EVA (ethylene-vinyl acetate-copolymer), ethylene-acrylate-copolymer, and PVAC (polyvinyl acetate) and other olefin glues, etc. The aforesaid sheet, or board, co~ i o~; fibrous material and thermoplastic glue is produced by methods known in the manufacture of particle board, board sheets, etc.
The invention will now be described with reference to the following Example. TheExample is given by way of illustration only and is not intended to limit the scope of the invention.
Example A particle board whose glue component comprised the thermoplastic polymer EVA
was first heated to a temperature of 60~C in a microwave oven and then pressed in a pressure-cell press obtained from ABB, Vasteras, Sweden. The particle board was pressed on a ~h~ping tool of the desired pattern. The tool was heated to 80~C and the board then pressed for one minute at a pressure of 1000 bars. A particle board having a pronounced relief pattern was obtained.
Examples of such sheet-like products are doors, cupboard doors, patterned woodenpanels, and so on. The products are produced from materials that have thermoplastic properties, preferably materials that contain wood-fibre based material.
Relief patterned sheet-like products, such as kitchen cupboard doors, patterned panels, doors, etc., are in great ~lem~nd Such products are typically produced from a wooden sheet into which the pattern is cut. ~ltPrn~1ively, pre-shaped wooden blanks or preforms can be fastened onto one surface of the sheet. It is also known to combine these two techniques.
The work involved in providing sheet-like products with a relief pattern, which is done m~nu~lly to a large extent, is expensive, time consuming and requires a high degree of expertise. Co~equently, there is a need of less complicated and cheaper methods of producing relief patterned sheet-like products.
When compression moulding particle boardj for instance, in a mould that has steep transitions between raised and sunken parts, a poor result is obtained due to the ease in which the board cracks. The board may even break in some cases.
WO 82/03595 teaches an ~pal~Lus and a method for producing patterned wood-fibre board which is intended mainly for use as a sound-in~ tin~ wall coveTing. According to this method, a wet wood-fibre pulp is formed with the aid of a patterned roll and then dried. When pr~c~in~. this known method, the board is patterned in the stage of its manufacture. C~onseqllPntly, it is necessa~y to make large investments and to apply a complicated process when wishing to use this technique.
EP 0 489 994 describes a door that is provided with one or layers of relief-patterned thermoplastic material. In this case, the actual wood has not been forrned or shaped CA 02245946 1998-08-ll W 097/28937 2 PCT/SE97/~0137 and there is used a pre-formed sheet of another material. Different areas of the surface are produced from different m~t~-ris~l with this technique. Furthermore, the technique is not suitable for producing sheet-like products that are patterned with sunken surfaces.
EP 0 574 953 teaches a method of producing relief-patterned wood-composite sheets, wherein the sheets may be formed with va~ious different patterns at the same time. The press time is relatively long (about 5 min.), which results in relatively high m~nllf~cturing costs. Furthermore, the patterned sheets have a relatively small surface size (20 x 20 inches).
There is thus a need of ~ltern~1;ve methods for pro~ cin~ relief-patterned sheet-like products with which the aforesaid problems are resolved and which enable sheets having a surface area of at least 1.5--2m2 to be pressed.
Summary of the Invention It has now been found that a relief-p~ttPrned sheet-like product of good quality can be produced quickly and simply by compression-moulding a sheet-like pre-form that includes a mixture of fibrous m~teri~l and thermoplastic glue in a press of the pressure cell type.
The invention will now be described in more detail with reference to the accompanying drawing, in which Figure 1 illustrates an example of a board pattern that can be produced by the inventive method; and Figure 2 is a cross-sectional view of the patterned board shown in Figure 2.
i W 0 97/28937 3 PCT/SE97tO0137 Detailed Description of the Invention By using a pressure-cell type press, it is possible to achieve effects that cannot be achieved with a conventional piston-type press. In a pressure-cell press, pressure is transferred by an elastic membrane. The blank is therewith pressed in many directions ~iml-lt~neously, which enables the blank to be shaped quickly and readily in accordance with the shape of an underlying moulding tool. This enables the compression moulded product to be provided with very complicated p~ttPrn~ Suitable blanks can also be pressed at very high pressures, about 800 bars and preferably in excess of 1000 bars, therewith achieving very short press times, e.g. press times below two minlltes, preferably below one mimlte SE-C-452 436 describes a pressure-cell type plant which is well-suited for use in conjunction with the method for producing relief-patterned sheet-like products in accordance with the invention. This press is designed for the m~mlf~ lre of not-readily shaped sheet-metal elP.me.nt~ A hard shaping tool is placed in the bottom of a tray and the blank or preform to be pressed is placed on top of the tool. The tray is pushed into the press and the blank then pressed against the shaping tool by means of an elastic membrane, for instance an hydraulically operated membrane.
If a sheet of fibrous material, for instance particle board, that contains no thermoplastic ~lue is compression moulded at high pressure with the aid of a pressure-cell press and a hard shaping tool, the sheet will buckle or collapse. Because thermoplastic glue is a cold flowing glue, these problems do not occur as readily when compression moulding a sheet of fibrous material that includes such glue. The pressing properties of such a sheet can also be enhanced by heating the sheet. The person skilled in this art will be able to establish appropriate press temperatures for different glue sorts~ with the aid of simple tests.
According to the invention, the shapability of the fibrous sheet can be further enhanced, by heating the sheet to a temperature of 40-70~C, preferably to 45-60~C, prior to pressing. The sheet may be heated conveniently in a microwave oven.
The fibrous m~te.risll is preferably a wood-fibre based material, such as sawdust, wood chippings or wood powder, and so on. Suitable thermoplastic glues are polymer glues, for instance EVA (ethylene-vinyl acetate-copolymer), ethylene-acrylate-copolymer, and PVAC (polyvinyl acetate) and other olefin glues, etc. The aforesaid sheet, or board, co~ i o~; fibrous material and thermoplastic glue is produced by methods known in the manufacture of particle board, board sheets, etc.
The invention will now be described with reference to the following Example. TheExample is given by way of illustration only and is not intended to limit the scope of the invention.
Example A particle board whose glue component comprised the thermoplastic polymer EVA
was first heated to a temperature of 60~C in a microwave oven and then pressed in a pressure-cell press obtained from ABB, Vasteras, Sweden. The particle board was pressed on a ~h~ping tool of the desired pattern. The tool was heated to 80~C and the board then pressed for one minute at a pressure of 1000 bars. A particle board having a pronounced relief pattern was obtained.
Claims (8)
1. A method of producing relief-patterned products, characterized by compressionmoulding in a pressure-cell press a product produced from a mixture of fibrous material and thermoplastic glue.
2. A method according to Claim 1, characterized in that the product is a sheet-like product.
3. A method according to Claim 1 or 2, characterized in that the fibrous material is a wood-fibre based material, such as sawdust, wood powder or wood chips.
4. A method according to any one of the preceding Claims, characterized in that the thermoplastic glue is EVA, ethylene-acrylate-copolymer, PVAC or olefin glue.
5. A method according to any one of the preceding Claims, characterized by heating the sheet-like product to a temperature of 40-60°C, preferably 45-60°C, prior to the actual pressing process.
6. A method according to any one of the preceding Claims, characterized by raising the temperature of the pattern forming tool in the pressing process.
7. A method according to Claim 6, characterized by maintaining said temperature in the range of 30-160°C, preferably 50-100°C.
8. A method according to any one of the preceding Claims, characterized by maintaining the press pressure above 800 bars, preferably above 1000 bars.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9600505A SE506046C2 (en) | 1996-02-12 | 1996-02-12 | Process for making relief patterned disc-shaped articles |
| SE9600505-3 | 1996-02-12 | ||
| PCT/SE1997/000137 WO1997028937A1 (en) | 1996-02-12 | 1997-01-29 | A method of manufacturing relief patterned sheet-like products |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2245946A1 true CA2245946A1 (en) | 1997-08-14 |
Family
ID=20401357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002245946A Abandoned CA2245946A1 (en) | 1996-02-12 | 1997-01-29 | A method of manufacturing relief patterned sheet-like products |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0880431A1 (en) |
| JP (1) | JP2000505369A (en) |
| AU (1) | AU709162B2 (en) |
| BR (1) | BR9707415A (en) |
| CA (1) | CA2245946A1 (en) |
| NO (1) | NO313372B1 (en) |
| RU (1) | RU2190521C2 (en) |
| SE (1) | SE506046C2 (en) |
| WO (1) | WO1997028937A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9162369B2 (en) | 2008-10-21 | 2015-10-20 | Andre Verville | Embossed monolayer particleboards and methods of preparation thereof |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20005186U1 (en) | 2000-03-21 | 2000-06-29 | Vießmann, Hans, Dr. Dr., 95030 Hof | Chipboard |
| EP3020524B1 (en) | 2014-11-13 | 2018-10-31 | SWISS KRONO Tec AG | Method for producing wood composite panels, in particular OSB wood composite panels, and wooden panel which can be produced with this method |
| TW202415843A (en) * | 2022-06-23 | 2024-04-16 | 瑞典商瑟拉羅克創新有限公司 | Process and arrangement for manufacturing a board element comprising cavities |
| US20240140061A1 (en) * | 2022-10-28 | 2024-05-02 | Ceraloc Innovation Ab | Process and arrangement for manufacturing a board element comprising cavities |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE452436B (en) * | 1986-03-25 | 1987-11-30 | Asea Ab | PRESSURE PLANT WITH A PRESSURE CELL TYPE PRESSURE |
-
1996
- 1996-02-12 SE SE9600505A patent/SE506046C2/en not_active IP Right Cessation
-
1997
- 1997-01-29 JP JP9528443A patent/JP2000505369A/en active Pending
- 1997-01-29 RU RU98117068/04A patent/RU2190521C2/en not_active IP Right Cessation
- 1997-01-29 BR BR9707415-2A patent/BR9707415A/en not_active IP Right Cessation
- 1997-01-29 CA CA002245946A patent/CA2245946A1/en not_active Abandoned
- 1997-01-29 AU AU17398/97A patent/AU709162B2/en not_active Ceased
- 1997-01-29 WO PCT/SE1997/000137 patent/WO1997028937A1/en not_active Application Discontinuation
- 1997-01-29 EP EP97904693A patent/EP0880431A1/en not_active Withdrawn
-
1998
- 1998-08-05 NO NO19983597A patent/NO313372B1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9162369B2 (en) | 2008-10-21 | 2015-10-20 | Andre Verville | Embossed monolayer particleboards and methods of preparation thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000505369A (en) | 2000-05-09 |
| EP0880431A1 (en) | 1998-12-02 |
| AU1739897A (en) | 1997-08-28 |
| BR9707415A (en) | 2000-01-04 |
| NO983597L (en) | 1998-10-06 |
| NO313372B1 (en) | 2002-09-23 |
| SE9600505D0 (en) | 1996-02-12 |
| AU709162B2 (en) | 1999-08-26 |
| SE506046C2 (en) | 1997-11-03 |
| WO1997028937A1 (en) | 1997-08-14 |
| NO983597D0 (en) | 1998-08-05 |
| RU2190521C2 (en) | 2002-10-10 |
| SE9600505L (en) | 1997-08-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |