Apparatus for thermoplastic foam extrusion

Details Apparatus for thermoplastic foam extrusion Apparatus for thermoplastic foam extrusion

1977-05-12

1978-11-28

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

425404, 425812, 425817C, B29D 2700

Patent

active

041273710

ABSTRACT:
A method and apparatus are provided for employment in thermoplastic foam extrusion utilizing a direct-injection extrusion process. Thermoplastic foam material is produced which is characterized by having relatively smooth external skin surfaces, and an internal cellular structure, by providing intensive cooling of the foam material immediately upon its issuance from an extrusion die orifice. Means are also provided for controlling the cooling rate utilizing an adjustable device which controls the rate of cooling air flow and air temperature within the extended foam tube.

REFERENCES:
patent: 3871802 (1975-03-01), Blackwelder
patent: 3976411 (1976-08-01), Rahles et al.

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