Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1972-11-27
1976-02-10
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
428 74, 428288, 428292, 428 98, 264177R, 264235, 264346, 264DIG5, 264DIG15, B29d 2700
Patent
active
039377776
ABSTRACT:
A process and apparatus for continuous production of molded sheets of a foamed thermoplastic synthetic resin, wherein a synthetic resin is fed into a screw extruder and a low boiling point liquid expanding agent is introduced under high pressure into the extruder and admixed with the resin in the extruder and thereafter the resulting admixture is extruded in the form of a plurality of foam filaments to insure proper distribution of the admixture to the nozzles of the extruder. A gear pump is provided for each nozzle. Also, to avoid collapsing of the foam means are provided for tempering the foam filaments by the application of heat.
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Alfter Franz-Werner
Hasberg Jurgen
Wienand Michael
Anderson Philip E.
Dynamit Nobel AG
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