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The main reason for the weld marks in the injection molding process is: when the molten plastic encounters inserts, holes, areas with inconsistent flow rates or areas where the filling flow is interrupted in the cavity of the injection molding machine, the convergence of multiple melts occurs; When the gate is injected into the mold, the materials cannot be completely together. Below, we will share with you the specific causes of weld marks and corresponding solutions.
The shunting and confluence performance of low-temperature melts is poor, and it is easy to form weld marks. If the inner and outer surfaces of the plastic part produce welding fine lines at the same location, it is often due to poor welding caused by too low material temperature. In this regard, the temperature of the barrel and nozzle can be appropriately increased or the injection cycle can be extended to promote the increase of the material temperature. At the same time, the flow of cooling water in the mold should be controlled, and the mold temperature should be appropriately increased.
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