Different technologies are used in recycling depending on the plastic material. Injection molding materials with glass fiber content present a special challenge. The most common method of recycling them is grinding. Increasingly, however, users have been impressed by the advantages of the repelletizing process. The reasons for this are explained in the following blog.
Grinders are often used to grind injection molding materials containing fiberglass. The problem with this method is that it produces fiberglass particles that are released into the air people breathe.
This poses an enormous health and safety problem.
This, of course, means an additional cost for the processor. Another disadvantage is that grinding often causes problems in the downstream process:
Regrind material has a different bulk density and pourability than recycled pellets.
If the two materials are combined and used in an injection molding machine, the mold filling characteristics will deteriorate. The reason for this is that the combination of components does not ensure effective mixing. The result is a higher number of rejects.
And if the regrind material contains metal parts, they can damage the mold during re-injection. The reason for this is that there is no safety filter in the grinder system.
Suction intake and transport are more difficult because of the dust content.
A better method for processing injection molding materials that contain glass fibers is repelletizing. Using this method has several advantages.
The following points highlight the advantages of repelletizing: