Direct gassing extruder with gas pockets

Details Direct gassing extruder with gas pockets Direct gassing extruder with gas pockets

1975-02-07

1976-10-19

Gilreath, Stanley N.

A21C 106, B29H 110

Patent

active

039867099

ABSTRACT:
In a single screw extruder particularly adapted for extrusion of foamed or foamable thermoplastic material by direct injection of gas or volatilizable liquid into the molten feed in the extruder, an improved means for mixing the gaseous or volatilizable liquid blowing agent with the molten feed in the extruder comprises a flow barrier between two adjacent flights of the worm screw and a gap in the foremost one of said adjacent screw flights, such that substantially the total polymer mass being forwarded by the screw is forced through the gap and the flow channel section behind the flow barrier remains substantially free of polymer over about one complete revolution of the screw, the blowing agent being injected into a space which is substantially free of polymer mass from a conduit inside the root of the screw through at least one opening between said adjacent flights and near that gap. This provides a relatively large area of contact between the blowing agent and polymer, conducive to fast and uniform diffusion of the blowing agent into the polymer.
The same construction is also adaptable to devolatilizing of a polymer mass containing some volatilizable fluid material.

REFERENCES:
patent: 2020878 (1935-11-01), Doering
patent: 2556276 (1951-06-01), Henning
patent: 2626856 (1953-01-01), Alles
patent: 2813704 (1957-11-01), MacKissic
patent: 3375549 (1968-04-01), Geyer
patent: 3570654 (1971-03-01), Hill
patent: 3687423 (1972-08-01), Koch

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