Apparatus for the sealing of the interior of synthetic-resin tub

Details Apparatus for the sealing of the interior of synthetic-resin tub Apparatus for the sealing of the interior of synthetic-resin tub

1976-12-03

1978-04-18

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

Core, pin or insert member

277 343, 425377, 425380, B29D 2304

Patent

active

040849333

ABSTRACT:
The synthetic-resin tube emerging from an extrusion die is internally sealed by a pair of sealing members having inflatable peripheries and connected to flexible members running back through the die so that one of the seals can be drawn toward the die while the other is entrained with the tube away from the latter and vice versa.

REFERENCES:
patent: 2814071 (1957-11-01), Allan et al.
patent: 3388425 (1968-06-01), Detter
patent: 3711232 (1973-01-01), Van Zon
patent: 3784345 (1974-01-01), Wissinger et al.
patent: 3814564 (1974-06-01), Streng et al.

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