synthetic wood powder, method and device for its manufacture; synthetic wooden board containing the synthetic wood powder, method and device for extrusion of

摘要

A synthetic wood meal in which a thermoplastic resin material of 25 to 80 wt% is mixed with a cellulose crushed material of 20 to 75 wt% that lies in the moisture content of within 15 wt% and the mean particle diameter of 20 mesh or less, the mixed material is kneaded so as to be set to gel, and the kneaded material is cooled and pulverized and regulated to a size that lies in a particle diameter of 10 mm or less. Then, the synthetic wood meal as the cellulose crushed material is mixed in at the rate of 20 to 75 wt% to the resin material, the mixed material is kneaded by heating and squeezed by a screw or screws of an extruding die 78 in an extruder. When the extruding material 79 passes through the inner wall surface of the extruding die 78, which lines with a fluororesin sheet 24 thereon, the cellulose crushed material included in the extruding material is smoothly extruded without being subjected to large resisting force, so that a molded article 29 is molded for a product having an uniform and high density and a predetermined thickness, while applying resisting force against squeezing force given from the extruder to the molded article 29 by using a braking means, thus molding a synthetic wood board having more uniform and higher density. IMAGE