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6644126 
Journal Article 
Surface defect formation in the injection molding of acrylonitrile-styrene-acrylate polymers 
Chang, MCO; , 
1996 
Yes 
International Polymer Processing
ISSN: 0930-777X 
CARL HANSER VERLAG 
MUNICH 
11 
1 
76-81 
WOS:A1996UL97600010 
Surface defects in the injection molding of acrylonitrile-styrene-acrylate (ASA) weatherable polymers, such as ''chevrons'', ''non-uniform haze'' and ''step defect'', are examined. A criterion is proposed based on a flow instability mechanism which suggests that recoverable shear strain, shear stress, and coefficient of friction are the key factors controlling the formation of surface defects. The criterion is supported by various experiments.