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What is the weld mark of injection molded products?

What is the weld mark of injection molded products? The weld mark refers to the visible line or defect that occurs when two or more flow fronts of molten plastic meet and fuse together during the injection molding process. It usually appears as a weakened area on the surface of the product, affecting its appearance and mechanical properties.

How to solve the weld mark problem? The following are some common solutions:

1. Increase the injection speed to ensure that the molten plastic flows more smoothly and fuses better.

2. Raise the mold temperature to slow down the cooling rate at the junction of the flow fronts.

3. Optimize the gate location to ensure a more rational flow path of the molten plastic.

4. Select plastic materials with better fluidity.

5. Improve the venting system to remove the trapped air in the mold cavity.

6. Balance the injection through multiple gates to achieve a uniform flow of the molten plastic.