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Selection of process aids
Selection of molecular weight of process aids depend upon the process:
Lower the molecular weight of process aids and softening temperature, greater is the effect on fusion. They are used in rigid extrusion.
Medium molecular weight processing aids are used for calendaring process.
Medium – high molecular weight processing aids are used in injection moulding as well as thermoformed products.
High molecular weight process aids are used in flexible PVC processing.Higher molecular weight process aids are used in foamed product extrusion at higher Phr level.