Melt fracture reduction

Details Melt fracture reduction Melt fracture reduction

2003-11-25

2009-12-15

Tucker, Philip C (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

Stock pressurizing means operably associated with downstream...

Including heating or cooling means

C425S38200R

Reexamination Certificate

active

07632086

ABSTRACT:
Melt fracture is reduced, without the necessity of polymer processing-aid additives specifically designed to alleviate exit region surface melt fracture phenomenon, by heating at least a portion of the die through which the polymer is extruded. The die exit region is maintained at a temperature above the bulk melt temperature of the polymer extruded through the die exit hole.

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http://en.wikipedia.org/wiki/Polytetrafluoroethylene.

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