Mold consists of three basic components, namely, dynamic simulation part of the floating cavity plate and fixed template. Push plate aperture to be compared with cores of large-diameter slightly larger number of threads to prevent thread appears scratches. Assembly organizations from push plate, push the semi-fixed panels and ejector rod composed of injection molding machines. Floating cavity plate distance from the maximum movement limit control of nails or similar devices. Principles of injection molding and casting are very similar. Resin material into a rotating screw, you should enter off three zones: the feeding area, compaction area and the plasticizing zone. Gate is the entrance of molten plastic into the cavity shunt wall must be smooth, in order to prevent melt flow generated parting surface of the shape of the resistance depends entirely on the shape of the shrinking role of the plastic to make plastic parts ejection difficulties. Injection cooling, the contraction depends on the plastic parts melt molding processes.