EP0253628A2 - Method for manufacturing plywood sheets - Google Patents
Method for manufacturing plywood sheets Download PDFInfo
- Publication number
- EP0253628A2 EP0253628A2 EP87306219A EP87306219A EP0253628A2 EP 0253628 A2 EP0253628 A2 EP 0253628A2 EP 87306219 A EP87306219 A EP 87306219A EP 87306219 A EP87306219 A EP 87306219A EP 0253628 A2 EP0253628 A2 EP 0253628A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- adhesive
- layers
- sheets
- applying
- strips
- 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.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G11/00—Applying adhesives or glue to surfaces of wood to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
Definitions
- the present invention relates to a method for the manufacture of plywood sheet.
- Conventionally plywood has been manufactured by the following method. Firstly, dry sheets of timber veneer are passed either through rollers or past spray heads which apply a coating of adhesive to the surface's top and bottom. Interleaved with the sheets to which glue has been applied, are dry sheets of veneer, usually, but not always, with the grain direction running in the opposite direction to the glued sheets. The wet pack of veneer sheets are then placed into either flat or curved moulds and the moulds closed by hydraulic pressure. The pack is held in situ until the glues have cured by heating. The time the pack is cured is dependent on the thickness and type of glue used. Once the glue has cured, the sheets are then removed from the press.
- a method of manufacturing a laminated sheet consisting of at least two layers secured together including the following steps: providing at least two of said layers, applying an adhesive to at least one major surface of one of said layers, applying the other layer to said surface so that upon curing of said adhesive said layers are fixed together, and wherein the step of applying said adhesive comprises applying a first adhesive to portions of said surface which first adhesive has a predetermined curing time, and also applying a second adhesive to further portions of said surface, with said second adhesive having a shorter curing time than said first adhesive so that said second adhesive retains said layers in a fixed relative position while said first adhesive cures.
- FIG. 10 there is schematically depicted a laminated sheet of plywood 10.
- the sheet 10 consists of several layers of timber veneer 11 which are to be secured together to form a sheet of plywood.
- the sheet 10 is actually a "wet" sheet with the glue still to be cured.
- the sheets 11 are to be fixed together by means of glue strips 12 and 13.
- the strips 12 and 13 are located between each pair of adjacent sheets 11.
- the glued strips 12 and 13 are alternatively arranged, however, other arrangements are contemplated for other materials.
- the strips 12 consist of a normal adhesive used for cold setting bonding, ie. a PVA, or an EVA glue.
- the beads 13 are of a quicker setting glue, preferably a foamed hot melt adhesive as applied by the Nordson (Registered Trade Mark) applicators sold by Nordson Corporation, 350 Research Court, Technology Park/Atlanta, Norcross, Georgia 30092, USA.
- Nordson Registered Trade Mark
- the material characteristics of most hot melt adhesives are improved by dissolving in the hot melt adhesive a gas such as nitrogen or carbon dioxide.
- the hot melt adhesive is volumetrically metered. When the hot melt adhesive, with gas dissolved, is applied to the veneer, the hot melt adhesive foams as it is exposed to atmospheric pressure.
- the hot melt adhesive with an advantage in that the "open time" is increased.
- the open time refers to the maximum allowable time available between the deposition of the adhesive and joining of the layers so that a useful bond can still be formed.
- the hot melt adhesive still retains its fast setting time and it has been found that by foaming the hot melt, it is possible to shorten the set time.
- the strips 12 and 13 are of a predetermined size and are spaced apart so that the resulting glue layer will be generally continuous between any two abutting layers 11.
- a curing time of 8 seconds for the strips 13 is all that is required. This is in contrast to 8 minutes in a conventional system.
- the glue strips 13 hold the sheets in a compacted configuration with the glue strips 12 cure.
- the above described preferred embodiment of the present invention has the advantages that expensive moulds and heating equipment are not required. This reduces energy consumption and reduces the capital investment requried to produce the plywood sheets.
- the sheets are formed quickly and cleaning of the glue applicators is considerably less in comparison to standard glue machines using thermal setting glues. In these standard machines, a great deal of maintenance is required.
- the applicators can be clean flushed relatively easily. eg. a flushing operation may only take 10 minutes and may need only to be performed every six weeks.
- the sheets are depicted as forming a generally planar plywood sheet. If the layers 11 are placed in a contoured mould, a shaped product can be produced.
- strips 12 could consist of an adhesive which is heat curable or curable by other means such as exposure to ultra violet light.
Abstract
Description
- The present invention relates to a method for the manufacture of plywood sheet.
- Conventionally plywood has been manufactured by the following method. Firstly, dry sheets of timber veneer are passed either through rollers or past spray heads which apply a coating of adhesive to the surface's top and bottom. Interleaved with the sheets to which glue has been applied, are dry sheets of veneer, usually, but not always, with the grain direction running in the opposite direction to the glued sheets. The wet pack of veneer sheets are then placed into either flat or curved moulds and the moulds closed by hydraulic pressure. The pack is held in situ until the glues have cured by heating. The time the pack is cured is dependent on the thickness and type of glue used. Once the glue has cured, the sheets are then removed from the press.
- The above described method is time consuming and requires expensive machinery. Accordingly this adds greatly to the cost of manufacturing plywood.
- It is the object of the present invention to overcome or substantially ameliorate the above disadvantages.
- There is disclosed herein a method of manufacturing a laminated sheet consisting of at least two layers secured together, said method including the following steps: providing at least two of said layers, applying an adhesive to at least one major surface of one of said layers, applying the other layer to said surface so that upon curing of said adhesive said layers are fixed together, and wherein the step of applying said adhesive comprises applying a first adhesive to portions of said surface which first adhesive has a predetermined curing time, and also applying a second adhesive to further portions of said surface, with said second adhesive having a shorter curing time than said first adhesive so that said second adhesive retains said layers in a fixed relative position while said first adhesive cures.
- A preferred form of the present invention will now be described by way of example with reference to the accompanying drawings, wherein:
- Figure 1 is a schematic perspective view of a plurality of layers to be glued together to form a laminated sheet;
- Figure 2 is a schematic end elevation of a portion of the sheet of Figure 1; and
- Figure 3 is a schematic end elevation of the portion of Figure 2 after the sheets therein have been pressed together.
- It should be appreciated that in the preferred embodiment to be described, the description is with reference to the manufacture of plywood sheets. However, the present invention in its broad form, as well as in the detailed form described with reference to the following embodiment, is just as applicable to the manufacture of other laminated structures including those formed of sheets of cardboard and plastics material.
- In the accompanying drawings there is schematically depicted a laminated sheet of
plywood 10. Thesheet 10 consists of several layers of timber veneer 11 which are to be secured together to form a sheet of plywood. In Figure 1, thesheet 10 is actually a "wet" sheet with the glue still to be cured. The sheets 11 are to be fixed together by means ofglue strips strips strips - The
strips 12 consist of a normal adhesive used for cold setting bonding, ie. a PVA, or an EVA glue. Thebeads 13 are of a quicker setting glue, preferably a foamed hot melt adhesive as applied by the Nordson (Registered Trade Mark) applicators sold by Nordson Corporation, 350 Research Court, Technology Park/Atlanta, Norcross, Georgia 30092, USA. In the Nordson applicators, the material characteristics of most hot melt adhesives are improved by dissolving in the hot melt adhesive a gas such as nitrogen or carbon dioxide. The hot melt adhesive is volumetrically metered. When the hot melt adhesive, with gas dissolved, is applied to the veneer, the hot melt adhesive foams as it is exposed to atmospheric pressure. This provides the hot melt adhesive with an advantage in that the "open time" is increased. The open time refers to the maximum allowable time available between the deposition of the adhesive and joining of the layers so that a useful bond can still be formed. The hot melt adhesive still retains its fast setting time and it has been found that by foaming the hot melt, it is possible to shorten the set time. - Once the
layers 10 are placed in a coextensive relationship, they are pressed together as seen in Figure 3. Thestrips strips 13 is all that is required. This is in contrast to 8 minutes in a conventional system. Thereafter, theglue strips 13 hold the sheets in a compacted configuration with theglue strips 12 cure. - The above described preferred embodiment of the present invention has the advantages that expensive moulds and heating equipment are not required. This reduces energy consumption and reduces the capital investment requried to produce the plywood sheets. The sheets are formed quickly and cleaning of the glue applicators is considerably less in comparison to standard glue machines using thermal setting glues. In these standard machines, a great deal of maintenance is required. In using a foamed hot melt adhesive applicator, the applicators can be clean flushed relatively easily. eg. a flushing operation may only take 10 minutes and may need only to be performed every six weeks.
- In the above described preferred embodiment, the sheets are depicted as forming a generally planar plywood sheet. If the layers 11 are placed in a contoured mould, a shaped product can be produced.
- It should further be appreciated that
strips 12 could consist of an adhesive which is heat curable or curable by other means such as exposure to ultra violet light.
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU692686 | 1986-07-15 | ||
AU6926/86 | 1986-07-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0253628A2 true EP0253628A2 (en) | 1988-01-20 |
EP0253628A3 EP0253628A3 (en) | 1988-08-17 |
Family
ID=3697533
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87306219A Withdrawn EP0253628A3 (en) | 1986-07-15 | 1987-07-14 | Method for manufacturing plywood sheets |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0253628A3 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0292813A2 (en) * | 1987-05-26 | 1988-11-30 | REICH Spezialmaschinen GmbH | Process and device for joining side parts to the front parts of board-shaped work pieces |
WO2002096607A1 (en) * | 2001-05-31 | 2002-12-05 | Hans Niedermayer | Board having a face and means for bonding said face to the face of another board |
US7226517B2 (en) * | 2004-01-30 | 2007-06-05 | Paul Lane | Method of surfacing a substrate |
EP1992759A2 (en) * | 2007-05-14 | 2008-11-19 | Fritz Egger GmbH & Co. | Lightweight construction board |
JP2015120324A (en) * | 2013-12-25 | 2015-07-02 | Dic株式会社 | Laminate, woody plate, decorative board, and method of manufacturing laminate |
GB2579813A (en) * | 2018-12-14 | 2020-07-08 | Rivdal Developments Ltd | Improvements in relating to the bonding of solid wood, mdf, particle board or such like |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1146641B (en) * | 1961-03-22 | 1963-04-04 | Paul Lechler Kunststoff Chemie | Process for gluing panels or other components to a substrate |
BE668090A (en) * | 1964-08-11 | 1966-02-10 | ||
JPS5347506A (en) * | 1976-10-06 | 1978-04-28 | Minami Machine | Method of horizontally jointing raw veneers |
JPS5563258A (en) * | 1978-11-08 | 1980-05-13 | Nat Jutaku Kenzai | Preparation of panel |
JPS58185673A (en) * | 1982-04-23 | 1983-10-29 | Natl House Ind Co Ltd | Bonding method |
-
1987
- 1987-07-14 EP EP87306219A patent/EP0253628A3/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1146641B (en) * | 1961-03-22 | 1963-04-04 | Paul Lechler Kunststoff Chemie | Process for gluing panels or other components to a substrate |
BE668090A (en) * | 1964-08-11 | 1966-02-10 | ||
JPS5347506A (en) * | 1976-10-06 | 1978-04-28 | Minami Machine | Method of horizontally jointing raw veneers |
JPS5563258A (en) * | 1978-11-08 | 1980-05-13 | Nat Jutaku Kenzai | Preparation of panel |
JPS58185673A (en) * | 1982-04-23 | 1983-10-29 | Natl House Ind Co Ltd | Bonding method |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0292813A2 (en) * | 1987-05-26 | 1988-11-30 | REICH Spezialmaschinen GmbH | Process and device for joining side parts to the front parts of board-shaped work pieces |
EP0292813A3 (en) * | 1987-05-26 | 1990-07-18 | REICH Spezialmaschinen GmbH | Process and device for joining side parts to the front parts of board-shaped work pieces |
WO2002096607A1 (en) * | 2001-05-31 | 2002-12-05 | Hans Niedermayer | Board having a face and means for bonding said face to the face of another board |
US7226517B2 (en) * | 2004-01-30 | 2007-06-05 | Paul Lane | Method of surfacing a substrate |
EP1992759A2 (en) * | 2007-05-14 | 2008-11-19 | Fritz Egger GmbH & Co. | Lightweight construction board |
EP1992759A3 (en) * | 2007-05-14 | 2010-03-03 | Fritz Egger GmbH & Co. | Lightweight construction board |
JP2015120324A (en) * | 2013-12-25 | 2015-07-02 | Dic株式会社 | Laminate, woody plate, decorative board, and method of manufacturing laminate |
GB2579813A (en) * | 2018-12-14 | 2020-07-08 | Rivdal Developments Ltd | Improvements in relating to the bonding of solid wood, mdf, particle board or such like |
GB2579813B (en) * | 2018-12-14 | 2022-02-02 | Rivdal Developments Ltd | A method of industrially bonding wood-based materials |
Also Published As
Publication number | Publication date |
---|---|
EP0253628A3 (en) | 1988-08-17 |
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Inventor name: ROTHERHAM, ALAN CHARLES |