Moisture responsive stiffening members for flexible containers
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United States of America Patent
Stats
-
Jun 18, 1985
Grant Date -
N/A
app pub date -
Nov 25, 1983
filing date -
Nov 25, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Flexible plastic bags used for the bulk storage and dispensing of fluids are often blocked from dispensing all the contents and/or entrap part of the contents in folds of the plastic as they shrink during dispensing. The invention is for a tongue or dip tube that is attached to the inner wall of the plastic bag near the location of the dispensing aperture. The tongue is formed of a laminate of two dissimilar materials, one non-hygroscopic and the other being hygroscopic, so that upon introduction of moisture into the bag, the hygroscopic layer will expand and the normally flat tongue will curl to form a thick tube that both prevents collapse of the bag and prevents closure of the dispensing aperture by the opposite wall of the bag.
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