抄録
Wood/plastic composite extrusion molding was implemented in order to produce a new material by combining the best properties of wood and plastics; the former is light and rigid, the latter is multifunctional and highly durable. In this study, we proposed a method in which melted plastic is tightly pressed into a cavity between a feeding wood plate and a die, and clarified the correlations among coating thickness, the length of the die, feeding speed and resin pressure. The appearance and adhesion strength of the coated resin were also investigated for each set of extrusion molding conditions. The result showed that the cross-sectional area of the coated resin strictly depends on the extrusion rate of the resin against wood plate feeding speed, while the resin pressure inside the mold cavity increases in proportion to the die length. This means that the resin pressure in the extrusion molding can be easily controlled regardless of coating thickness. Additionally, it was confirmed that the strength of adhesion between wood and plastics becomes sufficient, and even larger than that of wood itself if the resin pressure is set beyond a certain value.
