Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1981-06-18
1983-07-12
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
239551, 239562, 239566, 239567, 261DIG39, 264176R, 264DIG5, 366177, 425376B, 425817C, B29D 2700, B29F 300, B01F 1502
Patent
active
043930174
ABSTRACT:
Extrusion apparatus and method for making a cellular resin product are characterized by a conduit that extends into the extruder whereby a blowing agent is injected therethrough into the resin through a plurality of ports provided in the conduit in order to disperse the blowing agent more uniformly through the resin before it is extruded through a die into a zone of lower pressure whereupon the blowing agent expands to form numerous cells within the resin structure.
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Kim Hueng T.
Nehmey Sam D.
Anderson Philip E.
Kap George A.
The B. F. Goodrich Company
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