Seal

Details Seal Seal

1974-09-09

1976-06-08

Schacher, Richard A.

Advancing material of indeterminate length

By orbitally traveling material-engaging surface

226197, B65H 1724

Patent

active

039617351

ABSTRACT:
A sealing means for permitting continuous passage of a web material through a gap in a wall separating two zones at different pressures whilst minimising the flow of air from one zone to the other, comprising a cylindrical rod passing through the gap, means for feeding the web material on to the rod in helical disposition on one side of the wall, means for removing the web material from the rod after the web material has passed through the gap to the other side of the wall, and sealing means fitted to the circumference of the gap so as to contact the web material as it passes through the gap, and the use of two such sealing means as an entrance to, and exit from, an apparatus the interior of which is to be maintained at a pressure less than atmospheric pressure, and in which apparatus the web material is to be given an appropriate treatment.

REFERENCES:
patent: 3061159 (1962-10-01), Jacobsen
patent: 3245334 (1966-04-01), Long
patent: 3626603 (1971-12-01), Breyer

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