Integrated system for forming sheets and films of synthetic resi

Details Integrated system for forming sheets and films of synthetic resi Integrated system for forming sheets and films of synthetic resi

1978-01-16

1980-03-11

Rosenbaum, Mark

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Control means responsive to product weight or dimension

4253261, 425380, 425467, 425812, B29D 2304

Patent

active

041926374

ABSTRACT:
Integrated system for the extrusion of an end product from thermoplastic synthetic polymers taken directly from a polymerization reactor. The polymers withdrawn from the reactor are extruded through a die orifice to provide a tube which is inflated by a gas, usually air, introduced therein. Gaseous monomer contained in the polymers and evaporatingly released from the interior wall of the tube becomes intermixed with the inflating gas, and is withdrawn intermittently or continuously in response to measured changes in the diameter of the tube. Evacuation of monomer-containing gas prevents accumulation of the monomer to potentially explosive levels. The rates at which gas is introduced into or withdrawn from the tube are regulated to maintain changes in the lay-flat width of tube within acceptable limits in response to the tube width being sensed by a sensing arrangement.

REFERENCES:
patent: 3170011 (1965-02-01), Cheney et al.
patent: 3353209 (1967-11-01), Schad
patent: 3579728 (1971-05-01), Reid et al.
patent: 3821339 (1974-06-01), Johnson
patent: 3902832 (1975-09-01), Gregory et al.
patent: 4080143 (1978-03-01), Upmeier

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