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Wood bonding method.

The invention is a method of gluing wood using a reactive two-component thermosetting adhesive such as a phenol-resorcinol-formaldehyde (PRF) condensation product. One component is first coated on one of the members to be bonded. The second component is then spread directly on top of the first in a manner to minimize mixing; e.g., by spraying. When the mating member to be bonded is placed against the adhesive-coated first member and pressure is applied, the components are mixed. This begins the curing reaction between the components so that a thermosetting adhesive bond is formed. With selected adhesives, very rapid curing times are possible. A preferred adhesive has a first component comprising a PRF resin mixed with a methylene group donor hardener such as paraformaldehyde. The second part is also a PRF resin. No hardener is present in the second part. Instead, an oxygen- and nitrogen-containing heterocycle is used as an accelerator. Morpholine is a preferred compound. Cure times as low as two minutes to a handleable product are possible. The method is particularly useful for the manufacture of laminated veneer lumber.

ISSUE DATE: 08/31/99. INVENTOR(S): Winterowd; Jack G., Puyallup, WA, et al. ASSIGNEE(S): Weyerhaeuser Company. FILING DATE: 12/17/96. NUMBER OF CLAIMS: 8. PATENT NUMBER: 5944938.
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Copyright 2001 Gale, Cengage Learning. All rights reserved.

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Publication:Forest Products Journal
Article Type:Brief Article
Geographic Code:1USA
Date:Apr 1, 2001
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