Composite dunnage bag
View Patent ↗A composite dunnage bag being an elastic inner bag enclosed in a paper outer bag for insertion between stacks of cargo in transit. The mattress shape of the outer bag (when the dunnage bag is inflated) enables the bag to apply a footprint against the cargo walls that is greater than bags of the same length and height of the prior art this is an especially advantageous feeature when the spacing between stacks of cargo is greater than 12 inches.
1. A dunnage bag for filling a space between two parallel rows of cargo spaced greater than twelve inches apart for protecting said cargo when inflated to a pressure of at least ½ pounds per square inch, said dunnage bag comprising:
an air tight inner bag made of a flexible plastic sheet;
said air tight inner bag an extruded high density polyethylene tube with vinyl acetate modification wherein each end of said tube is sealed and whereby said vinyl acetate modification increases elasticity of said inner bag;
a valve means for inflating and deflating said inner bag;
an outer bag made of at least one layer of paper and enclosing said inner bag;
said outer bag comprising a main paper panel folded to form two broad sides, a bottom side and a top side with two opposite edges glued together to form a tube having two end edges; and
a pair of rectangular side paper panels, one of said side panels having an edge secured to one of said end edges of said tube and another one of said side panels having an edge secured to said another one of said end edges of said outer bag comprises extensible Kraft paper, grade range between 40 to 90 pounds;
said tube operable arranged to provide that said outer bag is farmed having a substantially mattress shape when positioned in said space between said rows of cargo and said inner bag is filled with pressurized air.
2. The dunnage bag of claim 1 herein said space between rows of cargois in a range of 12 to 22 inches and said mattress shape has dimensions about 20 inches wide, a height selected from a range between 30 and 48 inches and a length selected from a range between 48 and 102 inches.
3. The dunnage bag of claim 2 wherein said inner bag comprises:
an extruded high density polyethylene tube with vinyl acetate modification wherein each end of said tube is sealed and whereby said vinyl acetate modification increases elasticity of said inner bag.
4. The dunnage bag of claim 2 wherein said tube has a wall 0.1 millimeters thick.
5. The dunnage bag of claim 2 wherein said outer bag comprises extensible Kraft paper, grade range between 40 to 90 pounds.