Injection molded part defects are usually associated with surface marks and are formed by shrinkage of plastic from the mold surface.
First, the cause of this defect
(1). The melting temperature is not too high or too low.
(2). Insufficient plastic in the cavity.
(3). The surface of the contact plastic is overheated during the cooling phase.
(4) The flow path is unreasonable and the gate cross section is too small.
(5) Whether the mold temperature is compatible with the characteristics of the plastic.
(6). The product structure is unreasonable (enhanced into the ancient high, too thick, obviously thick and thin).
(7). The cooling effect is not good, and the product continues to shrink after demolding.
Second, the remedy
(1). Adjust the temperature of the shooting tank.
(2) Adjust the screw speed to get the correct screw surface speed.
(3). Increase the amount of injection.
(4). Ensure that the correct bedding is used; increase the screw forward time; increase the injection pressure; increase the injection speed.
(5). Check if the stop valve is installed correctly, because abnormal operation will cause pressure loss.
(6). Reduce the mold surface temperature.
(7). Correct the flow path to avoid excessive pressure loss; appropriately expand the cross-sectional size according to actual needs.
(8). Appropriately control the mold temperature according to the characteristics of the plastic used and the product structure.
(9). Improve product structure if allowed.
(10). Try to get enough cooling for the product.
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