PURPOSE: To obtain the particle board as a substitute of a thick plywood composed of chips of which a fiber orientation is specific and also said fiber has a length attaining to both of facing and backing materials, having excellent bending strength and compression strength and contrived to improve an added value and to save resources.
CONSTITUTION: After chips are added with adhesive, it is formed in a proper shape, then said formed article is cut into sheet form and the desired board is obtained. In this case, 10W50% of chips among all chips composing the board 1 have a fiber orientation which is tilted to the material face of said board material vertically approx. 15° and also has a fiber length which reaches the both of facing and backing material.