Manufacture and Use of Wood Particle Board

Wood particle board to be used as a substitute for lumber should have the following characteristics: 1) dimensional stability equal to wood, 2) even density through out, 3) good screw holding power, 4) freedom from warping, 5) machinability, 6) good compressive strength, 7) reasonable flexure and MOR in bending, 8) good shear strength, 9) economic cost, 10) good gluing properties, and 11) density not more than 12 percent higher than the lumber replaced. There are three main processes for the production of wood particle board: 1) multi-platen press, 2) vertical extrusion press, and 3) horizontal extrusion press. There are well established processes for the manufacture of particle board by the extrusion method. Prices to produce 800/1000 feet per hour of 3/4-inch board are: Multi-platen process–$375,000; vertical extrusion–$190,000; and horizontal Lanewood–$145,000. Cost of product is: Multi-platen process–$95 per M sq. ft.; vertical extrusion process–$85 per M sq. ft.; and Lanewood horizontal–$55 per M sq. ft. Prices for regular particle board core stock 3/4-inch thick range from $140 per M sq. ft., f.o.b.. on the West Coast to $115 per M sq. ft., f.o.b. in southeastern states. Because of its good gluing characteristics, waste pieces of particle board can be glued together at random and used for panels of suitable size. Any company that has a regular supply of wood of 40 tons or more per week can afford to put in a particle board plant.

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