Injection molding is a molding process that forces the thermal softened plastic material from the cylinder into the relatively cold cavity to make the product form the desired shape. Injection molding is a manufacturing technology of plastic parts. Molten plastics are injected into injection moulds under high pressure, and moulds are made by injection mold manufacturers.
The metal is usually made of steel or aluminum and is precisely machined to form the shape of the desired component. Injection is widely used to make various parts, from the smallest components to the whole car body panel. In the injection mold, the design of cooling system is very important.
This is because molded plastic products can only be cooled to a certain degree of rigidity. After being demolded, plastic products can be prevented from deformation due to external forces. As the cooling time accounts for about 70% ~ 80% of the whole molding cycle, a well designed cooling system can greatly shorten the molding time, improve the injection productivity and reduce the cost.
The molding cycle of Dalian injection molding consists of mold closing time, filling time, holding time, cooling time and ejection time. The largest proportion of cooling time is about 70% to 80%. Therefore, cooling time will directly affect the molding cycle and output of plastic products.
Plastics refer to the measurement of the speed of heat transmission from plastic to cold places by plastic. The higher the thermal conductivity of plastics, the better the heat conduction effect, the lower the specific heat of the plastic and the change of the temperature, so the heat is easy to escape, the heat conduction is better and the cooling time is shorter.