Protein-dialdehyde starch glue for birch type II plywood
1971
Weakley, F.B. | Roth, W.B. | Mehltretter, C.L. | Rist, C.E.
A hot-press, protein-dialdehyde starch glue was used experimentally to prepare plywood from yellow birch veneers. Gluing conditions were similar to those that were previously effective for bonding southern pine veneers to form interior-type plywood test panels. Yellow birch plywood produced under the conditions so developed met the performance requirements for Type II hardwood plywood. The excellent tack that was obtained with cold-pressed panels would allow prepressing in mill operations. Further-more, yellow birch, and southern pine veneers were sufficiently compatible with this moderately alkaline glue to permit mixing these species in the same plywood construction. Bleedthrough of glue was not observed in plywood panels having 1/26-in. birch face veneers. Results indicate that the protein-dialdehyde starch glue should be useful in the manufacture of birch Type II plywood.
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