Patent ID: 9169397
Filing Date: 2015-10-27
Classification: B29B,B29C,C08L

Abstract:
1. A manufacturing method for manufacturing a resin composition containing fine paper powder used in molding by using a fully-intermeshing type co-rotating twin-screw kneading extruder having a plurality of material feeding ports to knead a raw material containing a fine paper powder having an average particle diameter of 10 to 100 μm from 20 to 70 parts by weight, a thermoplastic resin from 30 to 80 parts by weight, with a sum of the fine paper powder and the thermoplastic resin being 100 parts by weight, at a temperature of no more than 210° C., by feeding the thermoplastic resin through an upstream material feeding port and the fine paper powder through a downstream material feeding port, wherein: the fully-intermeshing type co-rotating twin-screw kneading extruder is provided with two screws; at least a part of each screw is provided with a kneading disc unit; the kneading disc unit disposed in one screw has a cross section which is orthogonal to the central axis of the screw, has a minor axis and a major axis orthogonal to each other, and has the same cross section as the kneading disc unit disposed in the other screw; the two screws are disposed in such a way that the major axis of the kneading disc unit disposed in one screw enters into a rotation area surrounding the major axis of the kneading disc unit disposed in the other screw; the two screws are configured to rotate at the same speed in the same direction with the major axis of the kneading disc unit disposed in one screw orthogonal to the major axis of the kneading disc unit disposed in the other screw; and said upstream material feeding port is located proximate an upstream end of said screws and said downstream material feeding port is located at a midsection of said fully-intermeshing type co-rotating twin-screw extruder, such that said downstream material feeding port is distanced from said upstream end by at least half a total length of said screws.