1.The two - color injection molding machine consists of two sets of structure and specifications.The nozzle should be in a special structure according to the production mode, or the two components with the same structure can be rotated and transposed.When plasticizing injection, it is required that the melt temperature, injection pressure, injection amount and other technological parameters of the two sets of plasticizing injection devices should be the same, so as to minimize the fluctuation of technological parameters in the two sets of devices.
2.Compared with ordinary injection molded plastic products, the injection temperature and injection pressure should be high parameter values.The main reason is that the mold runner in the double color injection molding is longer, the structure is more complicated, and the flow resistance of the injection is greater.
3.The two color injection molded plastic products should be made of raw materials with good thermal stability and low melt viscosity, so as to avoid the high temperature of the melting material and the longer stay time in the runner.Polyolefin resin, polystyrene and ABS are widely used in plastics.