Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1979-11-05
1981-06-02
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264562, 264101, 264178R, 425 71, 425817C, 425DIG60, B29D 2700
Patent
active
042711070
ABSTRACT:
An extrusion system for the production of foam boards, billets and the like products includes an extruder (20) at a first higher elevation (22) extruding foamable resin through a die in the upper end of an elongated vacuum chamber in the form of an inclined barometric leg (26) which extends at its lower end into a shallow but large surface area pool (39) of liquid such as water. An elongated shroud or hood (44) on the lower end of the leg reduces the pressure head of water above the foam product as it exits the leg and moves out of the pool for processing at a lower second elevation. The large area of the pool reduces its depth for a given volume and minimizes fluctuations in the level of the pool and the pressure head above the product when the vacuum changes. In one embodiment the pool extends beneath substantially the entire floor of the building (30) enclosing the second lower elevation (31) in which the subsequent processing occurs. In another embodiment the pool (165) extends beneath the leg with the pool also serving as structural footings for the support of the leg and the platform forming the first higher elevation.
REFERENCES:
patent: 1990434 (1935-02-01), Kohler
patent: 2485857 (1949-10-01), Bower
patent: 3169272 (1965-02-01), Maxson
patent: 3507004 (1970-04-01), Taleff
patent: 3584108 (1971-06-01), Nelson et al.
patent: 3704083 (1972-11-01), Phipps
patent: 3822331 (1974-07-01), Cogliano
patent: 4044084 (1977-08-01), Phipps
Anderson Philip
Condec Corporation
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