Dewatering method for correcting water content of green veneer for plywood and apparatus for dewatering the green veneer

An apparatus for dewatering green veneers for plywood, wherein a large number of green veneers for plywood are vertically laminated to obtain a veneer laminate, and the veneer laminate is subject to a pressing force vertically applied to the veneer laminate to be compressed and dewatered to reduce a water content of the veneer laminate, the apparatus including:

• a support platen supporting the veneer laminate;
• a pressing member provided above the support platen and movable toward and away from the support platen;
• a pressing cylinder adapted to drive the pressing member and push the pressing member against the veneer laminate;
• a regulating member provided so as to vertically move relative to the support platen, the regulating member being adapted to stand upright from the support platen to be in contact with or closely adjacent to perpendicular walls on at least two opposite sides of the veneer laminate to regulate movement or stretch of the veneer laminate while the veneer laminate is being pressed by the pressing member, the regulating member further being adapted to abut the pressing member moving downward to move downward integral with the pressing member;
• a lifting and lowering device adapted to lift and lower the regulating member to and from an upright standing position;
• and
• a control device adapted to control the pressing cylinder which drives the pressing member, the control device including:
• a dewatering pressing stopper which controls the pressing cylinder so that the pressing force applied by the pressing member to the veneer laminate for dewatering is released or weakened in the range of 0 to 10 kg/cm2 and the application of pressing force for dewatering stops while the veneer laminate is being pressed and dewatered by the pressing member under the pressing force in the range of 15 to 50 kg/cm2;
• and
• a dewatering pressing restarter which controls the pressing cylinder so that the pressing force applied by the pressing member to the veneer laminate for dewatering is increased in the range of 15 to 50 kg/cm2 to restart the application of pressing force for dewatering, wherein
• at least one cycle of the application of pressing force for dewatering and the stop of pressing force for dewatering is performed and ends with the application of pressing force for dewatering.