Definition of two-color injection molding and two-color molding(overmolding) First,Two-color injection molding means that raw materials of different colors or different materials are injected into the same mold in batches, and after a molding, complete parts with different colors or different materials are formed. Normally, injection molding machines need to be equipped with two injection units to achieve two-color injection molding. Two-color molding refers to the combination of two different substances through the molding process to form a part with different colors. It uses two separate molding processes, in which after the first molding is completed, a part is placed into a second molding tool for a second molding. Therefore, it requires two different raw materials, two different tools and two separate processing steps to complete. 
Second, two-color injection molding and two-color molding process The process of two-color injection molding includes two steps: first, the raw material of the first color or material is injected into the mold to make a part of the component; The raw material of the second color or material is then injected into the other side of the previously made component, combining it with the first side to form a complete two-color injection molded part. The process flow of two-color molding is more complex. The first step is to select two different raw materials and put them into two separate injection molding machines or two different injection molding units. Then, through the first molding process, the two different materials are combined to form a partial assembly. In a second separate injection molding machine or injection unit, the molding is done again, turning some of the components into complete two-color molding parts. Third, the scope of application of two-color injection molding and two-color molding 
The scope of application of two-color injection molding and two-color molding is slightly different. Two-color injection molding is suitable for parts that need to be produced in the same mold with different colors or materials. More common products include handles, switches, keyboards, etc. In contrast, two-color molding is more suitable for products that need to be manufactured with robustness, aesthetics or multi-layer structures, such as high-end electronic products, auto parts, household appliances, and so on. Four, the advantages and disadvantages of two-color injection molding and two-color molding The advantages of two-color injection molding are low cost, high production efficiency, simple process, and can produce products with a variety of colors and appearance effects. However, it also has some disadvantages, such as the high cost of injection molding machines, the inability to produce very different colors or materials, and certain molding limitations. In contrast, the advantage of two-color molding is that more diversified product colors and materials can be created, and the products produced have better strength and aesthetics, and are not limited by molding. However, its relatively high cost, long production cycle, complex process and other shortcomings also exist. Summary Two-color injection molding and two-color molding (overmolding) are two different processes that are suitable for different product needs. In short, if you need to manufacture parts with only two colors or materials, two-color injection molding is a relatively simple and effective choice. If you want to make products with high complexity, aesthetic appearance and multi-layer structure, two-color molding is a better choice.
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