Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1976-03-31
1977-09-20
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264 453, 264 88, 264 89, 264210R, 264237, 264DIG5, 264DIG17, 425 72R, 4253261, 425817C, B29D 2700
Patent
active
040497607
ABSTRACT:
The present invention relates to a method of manufacture of profile-sections of any shape, including complex shapes, of structural foamed thermo-plastic material, having a density of between 0.4 and 0.9 with respect to the corresponding bulk or solid thermo-plastic material, the said method consisting in slowing-down and/or stopping the expansion at the immediate outlet of a conventional extrusion machine, at predetermined zones by blowing or spraying, in a differential manner at the periphery of the extruded product, a fluid at a temperature lower than the softening temperature of the said thermo-plastic material.
REFERENCES:
patent: 2756461 (1956-07-01), Hadley
patent: 3317363 (1967-05-01), Weber
patent: 3363034 (1968-01-01), Noland et al.
patent: 3548042 (1970-12-01), Hinrichs
patent: 3764642 (1973-10-01), Boutillier
patent: 3812230 (1974-05-01), Takahashi
"The Condensed Chemical Dictionary", Eighth Edition, Revised by Gessner G. Hawley, New York, Van Nostrand Reinhold, c1971, pp. 946-947.
Anderson Philip
Flocks Karl W.
Societe Chimique des Charbonnages
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