The purpose of granulation is to consider the quality, and it can be completely injected with broken materials. However, some products will have some problems when injecting completely broken materials, so they have to use granulated materials. For example, color or some additives should be added to the material, which can not be fully uniform in the screw of the injection molding machine after manual stirring, resulting in colored flowers or other material performance problems. Secondly, crushed materials are divided into particle crushing and flake crushing (bottle chips), and particle crushing has little effect. Due to the low density of flake crumbs, the storage screw in the injection molding machine is easy to slip, which affects the injection molding process. Of course, if the product requirements are not high, you can use scrap as long as it does not affect the injection molding.

The process of granulation is to rearrange the molecular structure of plastics by melting, and injection molding is the same. Physical properties have not changed. Their relationship is upstream and downstream, not parallel. Granulation is only for the convenience of injection molding.