Some tips to improve the shrinkage of plastic products

Plastic shrinkage refers to the percentage difference between the size of the after cooling to room temperature, the size of the plastic parts and removed from the mold at the molding temperature. It reflects the degree of cooling after removal of plastic parts from the mold size reduction. Any plastic products have a certain size requirements, with the requirements of the plastics in use or installation, high dimensional accuracy requirements. Fluctuations in the value of the time difference between shrinkage and production of product design plastic mold shrinkage of the estimated and actual shrinkage will affect the size precision plastic products. Secondly shrinkage plastic is also the complexity of the shape of the internal structure of plastic parts, whether there insert has a great relationship. In addition, the mold cavity in the course of constant wear and tear, so that the same mold in new and old, when the production of the product size varies. Molding parts dimensions, the gap with the change, which will affect the plastic parts tolerance. For this reason, we recommend that the relevant export enterprises: If you are extrusion or injection molding shrinkage problem, it should be a corresponding increase in margin from molds; if it is a large shrinkage of raw materials, can be used to join fiberglass modified to reduce the raw material of its own shrinkage big problem; if it is affecting the appearance of uneven shrinkage products, you should consider to solve the structure of products in terms of thickness distribution. It must be taken for heating or cooling the mold temperature control measures in the mold design and mold in order to make the temperature difference between the cavities minimize, and must pay attention to the thermostat to the cooling circuit design.