Rose-bottom or block-bottom valve bag

Details Rose-bottom or block-bottom valve bag Rose-bottom or block-bottom valve bag

1987-02-18

1988-07-26

Little, Willis

Flexible bags

With closure

Self-closing type

383 46, 383 54, B65D 3024

Patent

active

047596406

ABSTRACT:
A bag of foldable material has an end closure closing off one end of the bag and a filling valve tube device extends into the end closure at a corner of the bag, the filling valve tube device has an inner end disposed within the interior of the bag and has an inner layer which is convertable from a normally inactive adhesive state to a state capable of sealing off the filling valve tube device. A shut-off lip device of flexible material is disposed within the end closure and projects into the interior of the bag beyond the interior end of the filling valve tube device, the shut-off lip device being constructed to be responsive to the pressure of the filling material introduced into the interior of the bag to close off the interior opening of the filling valve tube device.

REFERENCES:
patent: 3081930 (1963-03-01), Owens
patent: 4049191 (1977-09-01), Stearley
patent: 4095736 (1978-06-01), Rothchild, III et al.

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