Check valve for fluid containers and a method of manufacturing t

Details Check valve for fluid containers and a method of manufacturing t Check valve for fluid containers and a method of manufacturing t

1993-03-16

1994-05-03

Nilson, Robert G.

Flexible bags

With closure

Self-closing type

137846, 156290, 2511491, 2511493, B65D 3024, F16K 1516

Patent

active

053081633

ABSTRACT:
A check valve comprises valve flaps formed by subjecting a front sheet and a rear sheet of synthetic resin, one of which is laid on top of the other, to heat sealing thereby sealing the same by thermal adhesion at the right and left sides thereof and at a plurality of curved heat sealings which are coupled to one another in such a way as to approximately form T-shapes at the junctions thereof so that the valve flaps have arabesque outlines. As a result, the lower parts of the heat sealings serve as fluid returning segments so as to improve the check valve in fluid sealing performance.

REFERENCES:
patent: 2584632 (1952-02-01), Southwick
patent: 3282412 (1966-11-01), Corella
patent: 3313472 (1967-04-01), Tjerneld
patent: 3430842 (1969-03-01), Yamaguchi
patent: 5144708 (1992-09-01), Pekar

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