Dewatering Method for Correcting Water Content of Green Veneer for Plywood and Apparatus for Dewatering the Green Veneer

摘要

A large number of green veneers for plywood respectively having high water contents and formed in a rectangular shape are vertically laminated to obtain a veneer laminate having a quadrangular prismatic shape. The veneer laminate is located between upper and lower platen members so that two opposite side faces of the veneer laminate vertically form cut face gathering planes. The upper and lower platen members are moved toward each other to apply a pressing force to the veneer laminate. The pressing force applied to the veneer laminate is released or weakened while the water drawn through the cut face gathering planes by the pressing force is dripping downward along the cut face gathering planes of the veneer laminate vertically formed.

主权项

1. 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; anda 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.