Abstract A valve bag comprising a back wall and a front wall made of first and second panels partially overlapping each other, said front and back walls being joined along their entire periphery, the first panel having at least two plies and the second panel projecting between the plies of said first panel, and a transverse seal at a distance from the top end of the bag uniting the two panels in their common area of overlap and defining between said second panel and the plies of the first panel a tubular self-closing opening extending transversely of the bag adjacent the top thereof, said panels in their common area of overlap being also united along at least one line extending from the transverse seal to the bottom of the bag, said tubular opening being of such diameter and being so located transversely of the bag as to allow insertion therethrough of a filling spout and free delivery of filling material from said spout.
A valve bag comprising a back wall and a front wall made of first and second panels partially overlapping each other, said front and back walls being joined along their entire periphery, the first panel having at least two plies and the second panel projecting between the plies of said first panel, and a transverse seal at a distance from the top end of the bag uniting the two panels in their common area of overlap and defining between said second panel and the plies of the first panel a tubular self-closing opening extending transversely of the bag adjacent the top thereof, said panels in their common area of overlap being also united along at least one line extending from the transverse seal to the bottom of the bag, said tubular opening being of such diameter and being so located transversely of the bag as to allow insertion therethrough of a filling spout and free delivery of filling material from said spout.
Claim 2
Dependent Claim
162 words
A valve bag comprising a back wall and a front wall made of first and second panels partially overlapping each other, said front and back walls being joined along their entire periphery, the first panel having at least two plies and the second panel projecting between the plies of said first panel, and a transverse seal at a distance from the top end of the bag uniting the two panels in their common area of overlap and defining between said second panel and the plies of the first panel a tubular self-closing opening extending transversely of the bag adjacent the top thereof, said panels in their common area of overlap being also united along at least one line extending from the transverse seal to the bottom of the bag, said tubular opening being of such diameter and being so located transversely of the bag as to allow insertion therethrough of a filling spout and free delivery of filling material from said spout.
Claim 3
Dependent Claim
25 words
A valve bag as claimed in claim 1 wherein the back wall and first and second panels of the front wall each have two plies.
Claim 4
Dependent Claim
36 words
A valve bag as claimed in claim 1 wherein the plies of the first panel which are located externally of the second panel are narrower than the plies which are located internally of said second panel.
Claim 5
Dependent Claim
18 words
A valve bag as claimed in claim 1, wherein the bag is constructed of heat sealable plastic film.
Claim 6
Dependent Claim
16 words
A valve bag as claimed in claim 1, wherein the bag is constructed of polyethylene film.