Patent ID: 8871345

Claim:
A method of manufacturing composite pellets for extrusion in which the composite pellets are used as a molding material extruded into a synthetic wood product containing a thermoplastic resin and wood meal as main ingredients, comprising: when the composite pellets are formed by extruding a molten material obtained by melt-kneading a raw material containing thermoplastic resin and wood meal with an extruder into a strand shape through many nozzle holes provided in a die nozzle mounted at a front end of the extruder, then cutting strands of the molten material at intervals of a predetermined length, setting the rate of extrusion (Q) of the extruder, the diameter (D) of each of the nozzle holes, and the number (n) of the nozzle holes such that a linear velocity (νd) falls within a range of 12 to 50, wherein νd=(Q×1000/3600)/[(D/20) 2 π·ρm·n], where νd=linear velocity (cm/sec), Q=rate of extrusion by the extruder (kg/Hr), D=diameter of each nozzle hole (mm), n=number of nozzle holes, and ρm=density of molten resin (g/cm 3 ).