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hen examined simply, the manufacturing process of a plastic injection part consists of the following stages: Plastic injection is a manufacturing method that involves shaping the melted plastic raw material by injecting it into a mold with the help of heat and removing it from the mold by cooling it. With this method, plastic parts of various sizes and categories can be produced, from the smallest components to garden furniture. It is one of the most common manufacturing methods. The machine in which the process is carried out is called a plastic injection machine. The first injection molding machine was made in the 1930s.