The cap mould should be preheated before test. There are two methods for preheating the mould. The first is to use the cooling water in the mold itself. There are mold warmers at home and aboard that widely used, which is a good method for mould heating. The second is the external heating method. The cast aluminum heating plate is installed outside the mould and heated from the outside to the inside. The method can heat up quickly, but consumes a large amount of heat.
For plastic cap mould, can use the injection shot heat to increase the temperature. There is no need to preheat if the raw material not difficult to inject. However, for large and medium-sized moulds, the molten material is forcibly injected into the cavity by means of warm material and high pressure. Although can get the parts sample, the damage to the mold itself is actually serious and energy is wasted. The obtained workpiece has large internal stress and severe deformation, and its size is very unstable, which brings trouble to the inspection of the size of the article. Therefore, this method should not be used.
At the same time that the mold is preheated after installation, the injection barrel is also warmed, when both temperatures meet the requirements, that is, when the mold temperature reaches 30 to 60 ° C or more. When the plastic in the barrel has been molten, and plasticized evenly, it is considered that the temperature is suitable, then the test injection condition is available, and the test mold can enter the test injection stage.
The preheating skills of the above plastic cap moulds are provided by our specialists. If you do not understand, please call us. Micon Mould Company has rich experience in the production of plastic products, specializing in the manufacture of various plastic molds.