Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1982-12-13
1984-06-26
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 461, 264 50, 264 53, 264DIG5, 425 4C, 425325, 425817C, B29D 2700, B29F 308
Patent
active
044565712
ABSTRACT:
A method and apparatus for producing a foamed polymeric sheet having comparatively high density skin layers. Molten polymer containing a foaming agent is extruded from a die into a post-extrusion region defined by the die and a spaced pair of rotating chill rolls which are spaced from the die. The post-extrusion region is maintained at a pressure sufficient to at least inhibit expansion of the foamable molten polymer through the use of cooled sealing elements which occupy a substantial portion of the space between the die and the chill rolls, and are spaced from the chill rolls. The rolls and the sealing elements are cooled so that foamable molten polymer in the space between the sealing elements and the rolls becomes solidified, completing the seal. The chill rolls are maintained at a temperature below the temperature of the molten polymer to aid the skin formation on the surfaces of the polymer. If desired, the polymer can pass directly from the chill rolls into a water bath.
REFERENCES:
patent: 2893877 (1958-07-01), Nickolls
patent: 3299192 (1967-01-01), Lux
patent: 3431164 (1969-03-01), Gilbert
patent: 3444036 (1969-05-01), Russell et al.
patent: 3459274 (1969-08-01), MacPhail, Sr.
patent: 3810965 (1974-05-01), Sen et al.
patent: 3864444 (1975-02-01), Johnson
patent: 3900544 (1975-08-01), Johnson et al.
patent: 4017245 (1977-04-01), Lang
patent: 4071591 (1978-01-01), Kobayashi et al.
patent: 4128369 (1978-12-01), Kemerer et al.
patent: 4154785 (1979-05-01), Inui et al.
patent: 4290248 (1981-09-01), Kemerer et al.
Anderson Philip E.
Gilman M. G.
McKillop A. J.
Mobil Oil Corporation
Powers, Jr. James F.
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