What are the main points of the two-color mold design

1. The back mold of the mold rotates 180 degrees around the center, the front mold does not move, and must be consistent with the front mold, this must be paid attention to when designing.

2. When designing, please carefully check the parameter data of the two-color injection molding machine,plastic injection molding service，such as the maximum die thickness, the minimum die thickness, and the distance between the top rod holes, etc.

3. The nozzle of the three-platen mold should be designed to automatically release the mold. Special attention should be paid to whether the demoulding action of the soft glue nozzle is reliable.

5. When designing the cavity for the second injection, in order to avoid inserting (or scratching) the cavity to damage the glue position of the product that has been formed for the first time, a part of the space can be designed. However, the strength of each sealing position must be carefully considered, that is, during injection molding, will the plastic be deformed under high injection pressure, which may lead to the possibility of cracking in the second injection?

6. When injection molding, the size of the first injection molding product can be slightly larger, so that it can be pressed tighter with another cavity during the second molding, in order to achieve the role of sealing glue.

7. Note that during the second injection, will the flow of plastic impulse the product that has been formed the first time, causing its glue position to be deformed? If this is possible, we must find ways to improve it.

8. The water transportation arrangement of the two cavities and cores is as sufficient as possible, and is balanced and the same.

9, 99% of the cases are the hard rubber part of the injection molded product first, and then the soft rubber part of the injection molded product. Because the soft glue is easy to deform.

10. In order to make the two kinds of plastics stick more tightly, consider the viscosity between the materials and the roughness of the mold surface. Two-color injection molding has a special TPU; and the smoother the mold surface, the tighter they stick.

 

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