Glass fiber compounds have traditionally been produced by strand pelletizing; however, recent trend shows movement toward underwater pelletizing.
Why process an abrasive product by underwater pelletizing?
Because of the highly abrasive characteristics of these polymers, special wear resistant systems are available for these applications. The true challenge does not lie in the production of the pellets but in the downstream processing, and in particular the drying of the pellets.
Challenges to be met:
Design modifications, the selection of special materials suitable for abrasive wear and the simple replacement of parts in the product flow have resulted in a solution that has already been successfully implemented in several applications processing PP, PBT, PC, PA and other materials with glass fiber proportions up to 66%.