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Use of inert gases in extruded medium density polypropylene foams
Author(s) -
Dey S. K.,
Natarajan P.,
Xanthos M.,
Braathen M. D.
Publication year - 1996
Publication title -
journal of vinyl and additive technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 1083-5601
DOI - 10.1002/vnl.10151
Subject(s) - polypropylene , materials science , blowing agent , composite material , plastics extrusion , inert , inert gas , layer (electronics) , extrusion , blow molding , polyurethane , mold , physics , quantum mechanics
Carbon dioxide gas was used as a physical blowing agent to produce medium density polypropylene foam sheets using a single screw extruder. The mechanical properties of the foam were similar in the machine direction and in the transverse direction. A better surface finish and a lower density foam was produced by using a commercial wrapping film as a cap layer. The process conditions and die design data are presented in an attempt to relate to product characteristics.