What are the reasons for the shrinkage of plastic parts and how to improve them?

    When the melted glue turns into a solid, the volume of the thick part of the product shrinks slowly, resulting in tensile stress. If the surface hardness of the product is not enough and there is no glue to supplement, the surface of the product will show signs of shrinkage, mainly in the thick part of the product, such as ribs or columns. The junction between the bit and the surface of the product.

    So how to improve the situation? Shenzhen mold manufacturers give the following methods：

    1.The wall thickness of the product is too large: reduce the wall thickness.

    2.Plastic parts process is too long: add gate.

    3.Insufficient metering amount: increase the metering amount.

    4.Small back pressure: add back pressure.

    5.Material temperature is too high: reduce the barrel temperature.

    6.High mold temperature: lower mold temperature.

    7.Shenzhen mold manufacturer Xiaobian answered that the injection and pressure holding time is too short: lengthen the injection and pressure holding time.

    8.Insufficient injection pressure: increase the injection pressure.

    9.Injection rate too fast: Slow down the rate of fire.

    10.Improper position of pressure holding switch: adjust the position.

    11.Insufficient water transport: increase the number of water transport groups.

    12.Improper gate position: Change the gate position to the thick part of the meat.

    13.Wear of the rubber ring: Replace the rubber ring.

    14.Nozzle blocked: Clean the nozzle.

    15.High hydraulic oil temperature: Clean the hydraulic oil heat exchanger.