Composite-molding method and injection-molding machine of different material resin

Abstract

The present invention has an object of eliminating the holding pin trace of a composite-molding of the dichromatic molding by refilling with resin by the pushing pin and preventing the lateral-shift of the primary molding during the refilling. It is made possible to fill closed recess and cavity with resin through a communicating hole formed in the primary molding by the pushing pin. A primary cavity moldand a secondary cavity moldare juxtaposed at symmetrical positions of a fixed plate. Core moldsclosing alternately with both thereof are juxtaposed on a rotary tableinstalled on a movable platen. Holding pinsof the primary moldingand a resin pushing pinare installed in the core moldin a way to appear and disappear in respect to a cavity. The primary moldingis held in contact with the surface of the secondary cavity mold by the holding pin. A pin holefor refilling resin is formed to be opened on a surface of the core mold by retracting the pushing pin. A secondary cavity including the pin holeis refilled with a different material resin by injection. The holding pinis retracted and sunk in the surface of the cavity mold. The pushing pinis moved forward to force the resin for refilling the pin holeinto the resin in the cavity. The regions not filled with resin due to the holding pinare refilled up.