Poppet check valve for controlled feeding of blowing agent

Details Poppet check valve for controlled feeding of blowing agent Poppet check valve for controlled feeding of blowing agent

1977-05-18

1978-11-07

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

With mechanical means forming or expanding pores

251333, 251337, 264DIG5, 264211, 425376R, 425817C, B29D 2700

Patent

active

041243366

ABSTRACT:
A poppet type check valve for controlled feeding of blowing agent into an assembly for the extrusion of thermoplastic polymeric foam material and, in particular, for controlled feeding of a blowing agent such as pentane into the barrel of an extruder assembly for extrusion of polystyrene foam; and an apparatus assembly comprising such a check valve in combination with the barrel of an extruder for extrusion of such foam materials.

REFERENCES:
patent: 3396743 (1968-08-01), Mackal et al.
patent: 3658973 (1972-04-01), Aykanian

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