The shrinkage force of the injection mold factory is calculated in the form of thermoplastic molding shrinkage. As mentioned above, the factors that affect the molding of thermoplastics are as follows: plastic varieties. During the molding process of thermoplastics, due to the volume change of the crystalline form, The molding plastic products of the injection mold factory have strong internal stress, and the molecular orientation of the residual stress frozen in the plastic parts is a factor. Therefore, compared with thermosetting plastics, the shrinkage force is larger, the shrinkage rate is larger, the shrinkage rate range is wider, and the directionality is obvious. In addition, the shrinkage rate after molding or debugging is generally larger than that of thermosetting plastics.
Injection mold factory: Plastic characteristics of molded plastic products. When the injection molding mold product is formed, the molten material contacts the surface of the mold cavity and the outer layer is immediately cooled to form a low-density solidified shell. The inner layer of the plastic is slowly cooled to form a high-density solid layer with large shrinkage, so the wall thickness is slow and the cooling is slow, and the thicker high-density layer shrinks greatly. The characteristics of the plastic parts of the molded plastic products in the injection mold factory have a great influence on the direction of shrinkage.
