Preheating Veneer Reduces Press Time in Phenolic-Bonded PLV

The high cost of adhesive bonding has been a major obstacle to the production of parallel-laminated veneer (PLV) lumber in structural thicknesses. The objective of this study was to reduce the adhesive bonding costs and make the production of PLV lumber economically more attractive to potential producers. It was found that press time could be reduced over 50 percent by starting with the veneer at elevated temperatures. Application of the adhesive to hot veneer does place limitations on the allowable assembly time. Within these limitations, however, bond quality was satisfactory, as indicated by delamination and compression shear tests.

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