What Is The Success Or Failure Of Injection Molded Parts

  • Cavity pressure

    Mold part cavity pressure is directly related to the finished part size. Changes in cavity pressure will change the dimensions of the part. The smaller the change, the stricter the size control or change. The higher the cavity pressure value, the less the part shrinks, all other values remain constant. One rule of shrinkage to remember is that plastic shrinks less in the direction of plastic flow and more in the direction perpendicular to the flow. A common mistake in this process is for molders to experiment with machine settings to determine when the gate freezes. At this point, a defect appears in the part, and the motion is reversed until the defect disappears. The problem with this is that the other 3 processes will interfere with the properties of the finished part in ways that the molder cannot see.

    Cooling and Injection Rates

    The rate at which plastic is injected into the mold, combined with cavity pressure, cooling rate and melt temperature, determines how much stress the plastic is subjected to before the finished plastic part begins to show signs of cracking and/or warping. This can be a very complex question.

    Improper melt temperature

    A final common processing defect is improper melt temperature. When using the processing guidelines provided by the material manufacturer, you will see the recommended temperature range. This process value is very important to ensure that you don't break any of the chemicals involved in making the final part. Mold temperature is also important in the development of stress. Before you try to mold your first part, make sure the resin is blown out of the nozzle as an even smooth creamy melt so that the full amount of resin in the mold is injected.

    Taizhou Huangyan Jinhong Plastic Mould Parts Co., Ltd. is an injection mold maker from China, its own plastic mold factory specializes in the production of plastic compression springs