Minimizing Face Checking of Plywood

A study of face checking in cold-pressed Douglas-fir plywood examined the contributing effects of grain (coarse, fine), quality of peel, (lathe check depth), moisture content at time of manufacture, and treatment of the plywood with a water repellent immediately after manufacture. The plywood was made commercially, and the face-checking tendency was developed by an accelerated test procedure consisting of 8 hours soaking in water and drying at 50 percent RH and 80?F to 8 percent M.C. Maximum resistance to checking was obtained from fine grain, tight veneer, and treatment with water repellent. The effect of moisture content differences (face veneer) between 2 percent and 4.4 percent was minor. The paper describes a rational measurement technique for measuring degrees of face checking, in terms of incidence and width of the check

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