Extrusion feed device for composite resin and composite resin mass

Abstract

An extrusion feed device for a composite resin capable of forming a composite resin extruded material having a variety of layer configurations not necessarily symmetrical. A plurality of cylindrical flow passages () and () for feeding a molten resin, an opening/closing valve () capable of opening/closing a center flow passage () and a cylindrical flow passage (), and a center opening/closing valve () capable of opening/closing the center flow passage are provided at the upstream side end part () of a discharge passage () for delivering the composite resin extruded material. A main resin () forming an outside layer is always fed from the cylindrical flow passage (), and the other molten resin () and/or () as an auxiliary resin is fed, at a proper timing, from the cylindrical flow passage () and the center flow passage () on the inside into the molten resin () on the outside by controlling the opening/closing valve () or the center opening/closing valve (). Thus, the composite resin mass in a variety of forms can be provided by involving, for example, multiple types of resins in the main resin layer in the state of being not involved in each other.