How to deal with weld marks in injection mold production?
When the injection mold is produced, the weld marks are often formed due to the convection of plastics. The weld mark is caused by the front part of the fused resin from different directions being cooled and not fully fused at the junction. In general, it mainly affects the appearance, coating and electroplating. In severe cases, the strength of the product is affected (especially in the case of fiber reinforced resin, especially serious).
Here are some ways to improve:
1) Adjust molding conditions to improve liquidity. For example, increase the resin temperature, increase the mold temperature, increase the injection pressure and speed.
2) Add an exhaust groove, and set a push rod at the generation of weld marks is also conducive to exhaust.
3) Minimize the use of release agent.
4) Set the process overflow material and use it as the generation place of weld mark, and then cut off and remove it after forming.
5) If only the appearance is affected, the burning position can be changed to change the position of the weld mark. Or the parts produced by the weld marks are treated as dark gloss surface, etc., to be modified.