PRODUCTION OF FOAMED RESINS

专利名称：PRODUCTION OF FOAMED RESINS发明人：JOHN GERALD MCCOY,WILLIAM REES

FOSTER

申请号：US3624192D申请日：19680506公开号：US3624192A公开日：19711130

摘要：Die assemblies and processes for extruding a foamable thermoplasticpolyvinylaromatic resin through a rectangular die orifice into a zone of lower pressuresuch that foaming of the resin occurs as it moves through the zone, said zone beingdefined by a pair of opposing concave surfaces maintained at a temperature lower thanthe extrusion temperature and curved so that they substantially conform to thecorresponding surfaces of the freely expanding resin without exerting a substantialcompressive force thereon. The die assemblies and processes are particularly useful forthe production of low density foamed boards having smooth surfaces.

申请人：MENSANTO CHEMICALS LTD.

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