COMPRESSION MOLDING APPARATUS

摘要

A compression molding apparatus comprising a rotatably mounted rotatable supporting member and a plurality of circumferentially spaced molds mounted on the rotatable supporting member. Each of said molds is adapted to be conveyed successively through a plastic material feed zone, a compression molding zone and a discharge zone by the rotation of the rotatable supporting member, and a plastic material feed means for feeding a plastic material in the heat-softened state to each of said molds is disposed in the plastic material feed zone. Each of the molds comprises a first mold portion and a second mold portion adapted to be opened and closed by being moved relatively to each other in a predetermined direction. The first mold portion and the second mold portion in cooperation with each other define a mold cavity. A conduit hole extending from the mold cavity is formed in the second mold portion. Each of the molds comprises a compression rod inserted slidably in the conduit hole. The conduit hole has a plastic receiving portion opened frontwardly in the rotating direction of the rotatable supporting member. The plastic material feed means consists of an extruder having an extrusion opening opposite to a passage for conveying the plastic receiving portion of the conduit hole by the rotation of the rotatable supporting member and is constructed such that the heat-softened plastic material extruded from the extrusion opening is received in the plastic receiving portion of the conduit hole conveyed by the rotation of the rotatable supporting member and cut, and the extrusion opening of the extruder extends slender in the conveying direction of the plastic receiving portion in the conduit hole and has a portion progressively wider downstream as viewed in the conveying direction.