Mold Tech

Two color injection mold

• 2021-09-16

1. The two-color mold injection molding machine is composed of two sets of plastic injection devices with exactly the same structure and specifications. The nozzle should have a special structure according to the production method, or be equipped with two sets of forming molds with exactly the same structure that can be rotated and transposed. When plasticizing injection, the process parameters such as melt temperature, injection pressure, and injected melt volume in the two sets of plasticizing injection devices are required to be the same, and the fluctuation of process parameters in the two sets of devices should be minimized as much as possible.

 2. 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 runner. The most widely used plastics are polyolefin resins, polystyrene and ABS materials.

 3. In the injection molding of two-color mold injection molding plastic products, in order to make the two different colors of melts can be well welded in the mold during molding, and to ensure the molding quality of the injection molded products, a higher melt temperature should be used. Higher mold temperature, higher injection pressure and injection rate.

 4. Compared with ordinary injection-molded plastic products, two-color mold injection molding plastic products have higher parameter values for the melt temperature and injection pressure during injection. The main reason is that the mold runner in the two-color mold injection molding is relatively long, the structure is relatively complex, and the injection melt flow resistance is relatively large.

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