Method for purging thermoplastic extruders

Details Method for purging thermoplastic extruders Method for purging thermoplastic extruders

1994-01-11

1995-06-13

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

With step of cleaning, polishing, or preconditioning...

134 7, 134 8, 134 2213, 134 2217, 25217423, 264169, 264349, B29C 3372, C11D 337, B08B 902

Patent

active

054240123

ABSTRACT:
Methods and additives for purging thermoplastic extruders and associated apparatus are included which involve the addition of a purging additive to a follower thermoplastic resin which additive when heated causes the follower resin to froth as it passes through the unit, the passage of frothed resin thereby causing the removal of the contents of the unit, which contents includes resident resin along with resident additives, degraded materials and any other undesired materials which may be present in the unit.

REFERENCES:
patent: 695323 (1902-03-01), Mittinger, Jr.
patent: 2779696 (1957-01-01), Rutherford, Jr.
patent: 3119720 (1964-01-01), Stiles et al.
patent: 5139694 (1992-08-01), Kmiec
patent: 5236514 (1993-08-01), Leung et al.
patent: 5246654 (1993-09-01), Ertle et al.
patent: 5298078 (1994-03-01), Itoh et al.

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