Manufacturing method for resin composition containing fine paper powder

A manufacturing method for manufacturing a resin composition containing fine paper powder used in molding by using a non-intermeshing type counter-rotating twin-screw kneading extruder having a rotor unit disposed in at least a part of a screw to knead a raw material containing a fine paper powder having an average particle diameter of 10 to 30 μm from 20 to 70 parts by weight, a thermoplastic resin from 30 to 80 parts by weight, and calcium stearate at 1 part by weight, with a sum of the fine paper powder, the thermoplastic resin, and the calcium stearate being 100 parts by weight, at a temperature of no more than 210° C.,

• wherein:
• the non-intermeshing type counter-rotating twin-screw kneading extruder is provided with two screws;
• the rotor unit disposed in one screw has a cross section which is orthogonal to the central axis of the screw and has the minor axis and the major axis orthogonal to each other and has the same cross section as the rotor unit disposed in the other screw;
• the two screws are disposed in such a way that the major axis of the rotor unit disposed in one screw will not enter into a rotation area surrounding the major axis of the rotor unit disposed in the other screw;
• and
• the two screws are configured to rotate in counter direction with the major axis of the rotor unit disposed in one screw orthogonal to the major axis of the rotor unit disposed in the other screw.