Claims
- 1. A method of laminating comprising the steps of:
- providing individual plies made of chipboard and coated with adhesive, which adhesive has been dried and is activatable by the application of water;
- exposing the plies to atmospheric moisture so that the chipboard contains moisture;
- pressing the adhesive coated plies together; and
- radiating the pressed adhesive coated plies with radio frequency energy so that the moisture in the chipboard is heated and is driven from the chipboard into the adhesive to soften the adhesive and the softened adhesive bonds the plies together.
- 2. A method according to claim 1 wherein the adhesive is a water activatable polyvinyl alcohol adhesive.
- 3. A method of laminating comprising the steps of:
- providing individual plies made of chipboard and coated with adhesive, which adhesive has been dried and is activatable by the application of heat;
- exposing the plies to atmospheric moisture so that the chipboard contains moisture;
- pressing the adhesive coated plies together; and
- radiating the pressed adhesive coated plies with radio frequency energy so that the moisture in the chipboard is heated and is driven from the chipboard to heat and soften the adhesive and the softened adhesive bonds the plies together.
Parent Case Info
This is a division of application 07/312,718 filed 2/21/89, now U.S. Pat. No. 4,929,029, which is a division of Ser. No. 07/057,214 filed 5/8/87, now U.S. Pat No. 4,821,359.
US Referenced Citations (8)
Divisions (2)
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Number |
Date |
Country |
Parent |
312718 |
Feb 1989 |
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Parent |
57214 |
May 1987 |
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