How to deal with weld marks in injection molding?

How to deal with weld marks in injection molding?

The weld mark is one of the common injection defects in production, which is usually caused by insufficient material filling, improper mold design or unreasonable injection molding parameter setting. If handled improperly, it will affect product quality and appearance. From [Dongguan Yongchao Plastic Mold Factory] detailed introduction of how to deal with the welding marks in the injection molding process. (for reference only)

1. Cause analysis
First of all, it is necessary to analyze the cause of the appearance of the weld mark to understand what causes it. The common reasons are: the injection speed is too fast, the material fluidity is poor, the temperature is not suitable, and the mold structure is unreasonable.

2, adjust the processing parameters
For different reasons, different measures can be taken. For example, the injection speed and pressure can be appropriately adjusted to increase the filling time; Reduce the injection temperature and improve the cooling speed of the mold; Set the proper valve opening sequence to avoid bubbles or concentric circles.

3. Replace the material
If the welding mark problem cannot be solved by adjusting the processing parameters, you can consider replacing the material. In this process, it is necessary to choose the material with appropriate physical properties to avoid reducing the performance indicators of the product. You can try some additive materials, such as toughening agents, flow additives, etc., to try to solve the weld mark problem.

4, improve the mold structure
If the appearance of the weld mark is related to the mold structure, it can be solved by changing the mold structure. This method requires a redesign or modification of the mold to ensure uniform material filling in the injection molding process and reduce the occurrence of weld marks.

5. Clean up
When dealing with weld marks, it is also necessary to do a good job of cleaning. A sander and manual sandpaper can be used to treat the weld marks and ensure that the surface of the treated product is smooth. In order to avoid contamination, it is also necessary to use a solution to clean the surface of the product and ensure that it is clean.

In short, when dealing with weld marks in injection molding, corresponding measures can be taken according to specific reasons. It is necessary to pay attention to this defect and deal with it in time to ensure the quality and performance of the product. At the same time, in daily production, management should also be strengthened to avoid similar problems.