Two-color molds are mainly used to produce plastic products with two different colors or two different material characteristics. This technology can make the product more diversified in appearance, and at the same time achieve the combination of soft and hard in function, improve the use experience and visual effect of the product.

Two color mold development process and production technical requirements
1. Design principles: two-color mold design should follow several basic principles, including hard glue for the first injection, soft glue for the second injection; Transparent material for the first injection, non-transparent material for the second injection; The plastic with high molding temperature does the first injection, and the plastic with low molding temperature does the second injection.
2. Mold structure: The two-color mold usually contains two sets of plasticizing injection devices with the same structure and specifications, and the nozzle needs to have a special structure or can be rotated.
3. Material selection: raw materials with good thermal stability and low melt viscosity should be selected to avoid decomposition due to high melt temperature and long residence time in the flow channel.
4. Process parameters: When injection molding plastic products, higher melt temperature, higher mold temperature, higher injection pressure and injection rate should be used.
5. Mold accuracy: the guide column guide sleeve of the mold embryo must be symmetrical up and down, and the front and back molds must be symmetrical to ensure that the back mold can be matched with the front mold after rotating 180 degrees.
Two-color injection molding plastic product usage description
Two-color injection molding technology is widely used in electronic products, power tools, medical products, home appliances, toys and other fields, covering almost all plastic fields. This technology enables products to meet more complex design requirements in both structure and appearance, while reducing costs and increasing product added value.

Process characteristics of two-color injection molding technology
1. Environmental protection and cost effectiveness: The core material can use low-viscosity materials to reduce the injection pressure, or use recycled secondary materials to reduce costs.
2. Combination of material characteristics: according to different use characteristics, such as soft material for thick finished skin material, hard material for core material, or foam plastic can be used for core material to reduce weight.
3. Product performance improvement: skin material or core material can use expensive and special surface properties of materials, such as electromagnetic wave interference, high conductivity, etc., to increase product performance.
The best match between two color injection molding materials and materials
When selecting the material for two-color injection molding, it is necessary to consider the compatibility of the material to ensure that the two materials can be well combined without falling off. For example, the combination of hard adhesive such as PA66 and soft adhesive such as TPE is feasible, the combination of PC and TPU, etc.