Process characteristics of two-color mold injection molding


1. The two-color injection molding machine consists of […]

1. The two-color injection molding machine consists of two sets of plasticizing injection devices with the same structure and specifications. According to the production method, the nozzle needs to have a special structure or be equipped with two sets of two-color molds with the same structure that can be rotated. During injection molding, process parameters, such as melt temperature, injection pressure, and melt volume, are required to be the same in the two sets of injection equipment. The fluctuation of process parameters in the two sets of equipment should be minimized.

2. Compared with the two-color mold injection molding plastic products, compared with ordinary injection molding plastic products, the melt temperature and injection pressure during injection must adopt higher parameter values. The main reason is that the mold runner in the two-color mold injection molding is relatively long, the structure is complicated, and the resistance to injection melt flow is large.

3. Two-color mold injection molding plastic products should use raw materials with good thermal stability and low melt viscosity to avoid decomposition due to high melt temperature and long residence time in the flow channel. The most commonly used plastics are polyolefin resins, polystyrene and ABS materials.

4. When two-color plastic products are injection-molded, in order to make two different colors of molten material can be welded in the mold well to ensure the molding quality of injection-molded products, higher melt temperature and higher mold temperature should be used. , Higher injection pressure and injection rate.