Thermoplastic bag, bag pack and method of making the same
AssigneeMobil Oil Corporation
InventorTimothy W. Pistner
Life of this patent
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Abstract
A method for forming a thermoplastic film handled bag comprising: forming a continuous collapsed thermoplastic tube having heat seal lines across the width of said tube at bag length intervals, longitudinally folding opposite sides of the heat sealed tube equally towards each other until they meet at a common center line, folding the structure once again in the same direction along said center line and removing eight film layers in one of the corner regions defined by a heat seal line and the spine of the common center line fold, the film removal yielding a bag mouth opening and single loop handles at near the opposite ends of said bag mouth opening. Interconnected bags can be formed into a roll pack or individually severed bags can be unitized into a bag pack.
Claims9
A bag structure made of a thermoplastic film comprising a front and rear bag wall, a bottom and an open mouth top portion, said open mouth portion being characterized by having a single film loop handles near opposite ends thereof, said bag having seamless ungusseted sides, said bag being folded so that said sides meet at a common center line, the bottom of said bag being heat sealed through four layers of film, said bag being folded again along a line coincident with said center line so that said handles are in registration.
A bag structure made of a thermoplastic film comprising a front and rear bag wall, a bottom and an open moth top portion, said open mouth portion being characterized by having a pair of single film loop handles near opposite ends theroef;
- and at the base of each handle, on each side thereof there are arcuate stress relief regions and the upper edges of said mouth extend above said stress relief regions said bag having the sides equally folded toward each other to a point of contacting at a common midline, said bag being folded again along said midline so that said handles are in registration and the same relationship as when they were formed.
Dependencies are inferred from the claim text.