Quality Control of Veneer and Plywood Manufacture

General principles of quality control must be adapted to the conditions in a particular industry. Present methods of quality control draw heavily on mathematical statistics. The quality control department in one plywood plant keeps running records to keep management and production informed. Veneer thickness is a critical factor to keep in control. Every hour the thickness of 25 sheets are measured and the average and range are computed and the results posted. Quality control checks are also kept on moisture content of veneer at the driers, squareness or taper in the clipping of veneer, the amount of waste generated at several points in the plant, and the amount of glue spread. In addition, defects in plywood are tallied and classified by type and probable source. Shear tests are made on the plywood and quality control charts are kept on shear strength and percent wood failure.

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