How to deal with weld marks in injection molding?

How to deal with weld marks in injection molding?Weld marks are one of the common injection molding defects in production, usually caused by insufficient material filling, improper mold design or unreasonable injection molding processing parameter settings.

How to deal with weld marks in injection molding?

Weld marks are one of the common injection molding defects in production, usually caused by insufficient material filling, improper mold design or unreasonable injection molding processing parameter settings. If not handled properly, it will affect product quality and appearance.

[Dongguan Yongchao Injection Molding Factory] introduces in detail how to deal with weld marks in injection molding. (For reference only)

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

2. Adjust processing parameters
Different measures can be taken for different reasons. For example, the injection speed and pressure can be adjusted appropriately to increase the filling time; reduce the injection temperature and increase the cooling speed of the mold; set a suitable valve opening sequence to avoid bubbles or concentric circles.

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

4. Improve mold structure
If the appearance of weld marks is related to the mold structure, it can be solved by changing the mold structure. This method requires the mold to be redesigned or modified to ensure that the material filling in the injection molding process is uniform and reduce the occurrence of weld marks.

5. Do a good job of cleaning
When dealing with weld marks, you also need to do a good job of cleaning. You can use a grinder and manual sandpaper to treat the weld marks, and ensure that the surface of the product is flat after treatment. In order to avoid contamination, you also need to use a solution to clean the surface of the product and ensure that it is clean.

In short, when dealing with weld marks that appear in injection molding, you can take corresponding measures according to the 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 from happening again.