INJECTION COMPRESSION APPARATUS OF PLASTIC GLAZING FOR VEHICLE GLASS

摘要

The present invention relates to an injection-compression molding apparatus for plastic glazing for use as automotive glass, comprising: an upper mold and a lower mold disposed so as to face each other; an injection flow path formed for injecting a molten resin into the upper mold and the lower mold; a compression core selectively installed in the upper mold or the lower mold so as to move in a linear reciprocating motion in a direction vertical to the whole area of the molten resin, so that the whole area of the molten resin is compressed with uniform pressure; a power means for supplying power for the linear motion of the compression core; a power transmission means for transmitting the power from the power means to the compression core; and a gate opening/closing means provided for opening or closing the gate of the injection flow path. According to the configuration described above, as a link member transfers the torque of a hydraulic cylinder to a compressive force transferring block by using the lever principle during the operation of the hydraulic cylinder, the pressure of the hydraulic cylinder can be proportionately amplified to a pressure necessary for pressurizing the whole area of the molten resin; and as the gate opening/closing means activates an opening/closing block to block the gate when the compression core applies pressure on the whole area of the molten resin, the molten resin can be prevented from flowing backward from the gate to the injection flow path.