MOLDING METHOD FOR PREFORM

摘要

PROBLEM TO BE SOLVED: To provide a molding method for a preform which has a layer of a blend of a plurality of resins, wherein a dispersed state of the blend is homogeneous and fine and also the degree of thermal deterioration of each resin constituent is suppressed and which is obtained by a compression molding method. SOLUTION: In this molding method for the preform, a first resin is plasticized in a multiaxial extruder with a side feed and a second resin is fed from the side feed into the first plasticized resin and mixed therewith. A molten composite resin block thus obtained is carried to a compression molding position and subjected to compression molding.