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What Happens When The Plastic Injection Mold Produces Welding Marks
Jun 05, 2018

Core Tip: During production, weld marks are often formed due to the convection of plastics. The weld marks are caused by the fact that the front part of the molten resin from different directions is cooled and fails to be completely fused at the joint. Under normal circumstances, it mainly affects the appearance and affects the painting and plating. In severe cases, it has an effect on the strength of the product (especially when it is a fiber-reinforced resin).


     Refer to the following items to improve:


     l) Adjust the molding conditions to improve the fluidity. For example, increase the temperature of the resin, increase the mold temperature, and increase the injection pressure and speed.


     2) The addition of an exhaust groove and the provision of an ejector rod at the place where the weld line is generated also facilitates the exhaust.


     3) Minimize the use of release agents.


     4) Set the process flash and use it as a weld mark. After molding, cut it and remove it.


     5) If you only affect the appearance, you can change the firing position to change the position of the weld mark. Alternatively, the place where the weld mark is generated is treated as a dark glossy surface and modified.