There is rotational molding, compression molding, and blow molding, as well as spray-up molding.
The quality of a plastic injection mould is determined by its geometry and process parameters
The main driving force for polymer melt flow during the filling and compression of the mould is the system pressure (P). P is measured in the holding stage and is related to part geometry and weight. It indicates the quality of the molded part. A system pressure curve is a statistical tool used to predict the quality of injection molded parts.
However, poor designs may result in short shots. A straight-pull mold is a typical example of a bad mould. A straight-pull mould has 2 halves, and the ribs can be thin or uneven, which increases the chances of short shots.
Increasing spending on construction and manufacturing will further drive the demand for these products. In China, molds are manufactured at extremely low costs. The wages of Chinese moldmakers are much lower than in the North American markets.
In France, for example, a basic injection mold can cost between 5000 and ten thousand euros. It can accommodate up to 12 parts.