What is injection molding and what does it include?

injection molding is the process in which plastic manufacturers melt plastic and mix it evenly with other additives during heating, and then inject it into an injection mold. After cooling and solidifying, the plastic product with the required shape is obtained. The principle is similar to metal casting. However, in the injection molding process, plastic supplier only melt the plastic material and let it solidify naturally by gravity flowing into the injection mold, which is impossible to obtain a complete Plastic Product. This is because the melt viscosity of plastic is extremely high, and it is impossible for it to form naturally by flowing into the injection mold. In order to make the plastic fully flow into every corner of the injection mold and obtain a Plastic Product with full shape, no shrinkage marks on the surface, and no voids inside, high pressure must be applied to the plastic during molding. Generally, the injection molding process of injection molding manufacturer mainly includes three processes: preparation before molding, molding operation, and post-processing of plastic parts.

• Preparation before molding

To ensure the smooth progress of injection molding production and the quality of plastic products, a series of preparation work needs to be done before the formal molding operation. These preparation work mainly includes: material selection, material pre-processing, barrel cleaning, insert preheating, and mold release agent selection.

• Molding operation

After the preparation work is completed, the plastic factory can start the formal molding operation, which is the process of transforming raw materials into plastic parts, mainly including feeding, plasticizing, injection, holding pressure, cooling, and demolding.

• Post-processing of Plastic Products

After the molding and demolding of the plastic parts, some post-processing is still required, mainly for shaping the Plastic Products and eliminating the internal stress of the parts to avoid deformation or cracking during use. The post-processin