SUBSTANTIALLY UNCURVED AND UNWAVED PLYWOOD PRODUCED BY USING VENEERS WITH UNSTRAIGHT FIBERS AND METHOD FOR PRODUCING SUCH A PLYWOOD

摘要

A substantially uncurved and unwaved plywood (A) includes at least one pair of veneers (11, 12) located symmetrically with respect to a middle of a thickness of the plywood and having unstraight grains which coincide with each other. A method for producing a substantially uncurved and unwaved plywood comprises locating at least one pair of veneers (11, 12) with identical unstraight grains in a pair of positions symmetrical with respect to a middle of a thickness of a plywood to be produced, in such a manner than the grains of the veneers coincide with each other. A simple method for continuously preparing pairs of veneers with identical unstraight grains comprises (i) peeling from a cylindrical log (1) with unstraight fibers a continuous sheet (14) of twice a thickness of each one of a pair of veneers to be prepared, (ii) cutting the sheet into a predetermined length to provide a thick veneer (15), and (iii) slicing the thick veneer (15) at a middle of a thickness thereof to prepare a pair of veneers (16, 17) with equal thicknesses and with identical unstraight grains. Another simple method for continuously preparing pairs of veneers with identical unstraight grains includes slicing the continuous sheet before cutting into the predetermined length. Other methods for continuously preparing pairs of veneers with identical unstraight grains are also disclosed.