An injection mould is a process in which parts are assembled and contained within it a cavity into which plastic material is injected and cooled. This results in the formation of the plastic parts. It is the cavity which gives the molding its form. The cavity may be defined as the mould part which imparts shape to the molding and during the injection, there is a melting runner from the injection machine to the end of the plastic part. Once the material cools down, the runner will cool down as well. It means that the runner is left behind and is wasted.
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