Principles for Preparing Engineering-grade PET Resins

13 COMPOUNDING PRINCIPLES FOR PREPARING ENGINEERING-GRADE PET RESINS 

A twin-screw extruder is generally preferred for producing rubber-toughened, glass-filled PET compounds for injection moulding applications. The PET and impact modifier are added at the throat while the glass reinforcement is added downstream. The size of the rubber domains will depend on the amount of energy and the capability of the equipment used for dispersion. 

---