Equipment and machinery designs

The most common processing issues in working with polycarbonate-based resins are appearance defects. The most common type of aesthetic defect is the appearance of contaminant inclusions within transparent parts, commonly known as hlack specks. These defects are usually found to be degraded resin—either within the polycarbonate stream or from other resin sources—and occur when charred material, which has formed over time on the surface of the processing equipment, breaks away and 

Polycarbonate resins are available in formulations with a wide variety of additive options, such as UV stabihzers and mold-release agents. More recently, manufacturers have expanded their portfohos to include materials that are compliant with the major international environmental standards. 

Authors can be contacted at Jim.DeRudder ge.com, Niles.Rosenqmst ge.com, Brian. Sapp ge.com, or Paul.Sybert ge.com or by writing them at GE Advanced Materials, 1 Lexan Lane, Mt. Vernon, IN 48620, USA. 

SchneU, The Chemistry and Physics of Polycarbonates, WUey-lnterscience, New York, N.Y., USA, 1964, p. 1. 

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