Today we are going to discuss one case for the sink mark, we will show what we would do when we face the sink mark problem.

1. Basic information: PE, Holder (car parts) shrinks poorly and snakes are bad.

2. Description: The plan to increase the injection pressure has not been solved. In order to make the resin pressure fully function, the gate thickness is increased and the sink mark is improved. However, post-processing of the gate is required, so waste of labour force becomes a new problem.

3. Improvement process: The shape and position of the gate were changed, and the shrinkage was completely solved. The snake pattern is also reduced, and the molded part looks more beautiful. In addition, due to the use of the sub-gate method, the post-gate processing problem has also been solved. as the picture shows:

4. Remarks: In this case, shrinkage is difficult to solve when molding with edge gate. In order to make the resin pressure in the region where the shrinkage occurs, the gate is change to sub-gate. Through this setting, the shrinkage problem is solved, and the appearance of the product is also greatly improved. The post-gate processing problem has also been solved.