Formation and Solution of Surface Concave of Injection Barrel in Tianjin

1. Causes of dents on the surface of barrels
1. Different parts of the plastic drum have different thickness, inadequate cooling of the mould, problems in cooling water or waterway, and short cooling time, resulting in dents.
II. The Process of Causes
In the production process of plastic barrel, the occurrence of concave marks is a bad performance of the product. The frequency of concave marks is relatively high. The volume of the sol injected into the mould shrinks when it is cooled. In the process of shrinkage, the barrel body has contraction marks in some positions due to the design of the mould, so-called concave marks.
Material physical properties, shrinkage of large raw materials are also prone to dents. When changing the forming conditions to eliminate dents, the setting conditions should be set in the direction of small shrinkage. That is to say, the production process is adjusted, the die temperature and barrel temperature are reduced, and the injection pressure is increased.