Plastic article or earthenware shaping or treating: apparatus – With mechanical means forming or expanding pores
Patent
1975-01-20
1976-09-21
Husar, Francis S.
Plastic article or earthenware shaping or treating: apparatus
With mechanical means forming or expanding pores
264 459, 425208, 425817C, B29D 2700
Patent
active
039816494
ABSTRACT:
An apparatus for producing a foamed thermoplastic resin comprising an extruder including a barrel through which a thermoplastic resin is fed while being melted and a head to extrude said molten resin from said barrel, and gas injector means to inject a gas into said molten resin in said barrel through a gas injecting port in said barrel whereby said foamed thermoplastic resin article is formed by extruding said gas containing molten resin, said gas injector means characterized by comprising a gas metering means or gas flow rate setting means disposed adjacent and connected to said gas injecting port to conduct said gas therethrough while a constant flow rate is maintained, and a volume of a gas passage from said gas flow rate setting means to said gas injecting port in said barrel being sufficiently set for the gas pressure in said gas passage to respond to variation in the pressure of said molten resin in said barrel.
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Azuma Masao
Orimo Katsumi
Shimano Takashi
Yamamoto Shoji
Husar Francis S.
Rosenbaum Mark
The Furukawa Electric Co. Ltd.
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