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US 8,282,539 B2Granted
Multi-layered bags and methods of manufacturing the same
AssigneeExopack, LLC
InventorsStuart Sharp, Allyson Smith, George Solomon
Life of this patent
Estimating the term…
Abstract
A bag can include walls formed of a material having multiple layers, which can include two polyolefin layers and a paper layer. The bag can be formed into a sewn-open-mouth configuration in which a stitching element extends through a wall of the bag. The bag can include a grease-resistant seal that substantially prevents grease from escaping from the bag via an opening in the wall through which the stitching element extends.
Claims31
A method of manufacturing a bag, the method comprising:
- attaching a polyamide film to a first side of a paper layer so that the polyamide film and the paper layer are abuttingly joined to each other and so as to form a barrier relative to the paper that is capable of preventing the passage of grease and solvents therethrough;
- forming the polyamide film and the paper layer into a tube body having a first end, a second end, a front wall, and a back wall, wherein the polyamide film is exterior to the paper layer;
- introducing a stitching element into openings in the front wall and the back wall of the tube body to thereby form a substantially grease-impermeable seal at the first end of the tube body;
- and
- forming substantially grease-impermeable seals between the stitching element and the openings in the front wall and the back wall of the tube body.
2 more elements
A bag comprising:
- a tube body that defines a front wall and a back wall, wherein the tube body comprises:
- a polyamide layer that defines a barrier capable of preventing the passage of grease and solvents therethrough;
- and
- a paper layer abuttingly joined to at an interior surface of the polyamide layer;
- and
- a stitching element providing a substantially grease-impermeable seal between the front wall and the back wall at a first end of the tube body, wherein the stitching element extends through a first opening in the front wall that passes through the polyamide and paper layers and a second opening in the back wall that passes through the polyamide and paper layers,
- wherein the front wall interacts with the stitching element at the first opening to substantially prevent grease from entering or exiting the tube body via the first opening, and the back wall interacts with the stitching element at the second opening to substantially prevent grease from entering or exiting the tube body via the second opening.
4 more elements
A bag comprising:
- a tube body formed from a material that comprises a polyamide film and a paper layer abuttingly joined to an inwardly facing surface of the polyamide film, wherein the tube body defines a front wall and a back wall, and wherein the polyamide film defines a barrier capable of preventing the passage of grease and solvents therethrough;
- and
- a stitching element that extends through both the front wall and the back wall, wherein the polyamide film of the front wall interacts with the stitching element to form a seal that is configured to substantially prevent passage of grease, and wherein the polyamide film of the back wall interacts with the stitching element to form a seal that is configured to substantially prevent passage of grease.
Dependencies are inferred from the claim text.