Abstract: A paper bag with a film inner bag in which the inner bag element is constructed so that its closed end portions can be torn in the lateral direction, thus allowing easy opening by hand across the entire width of the bag or across a part of this width. The inner bag element consists of a synthetic resin film and has cut portions formed along the longitudinal direction in the end portions of the bag that are closed by heat-sealing and that are planned to be opened in the future. The end portion constituting the bottom part is closed by heat-sealing, or by being folded together with the outer bag element or stitched with a sewing machine. The outer bag element, which consists of at least one layer, is formed mainly from craft paper. The synthetic resin film that forms the inner bag element is formed from a thermoplastic resin, and has the property of easy tearing in one axial direction.

Abstract: A paper bag is provided with a closure flap (14) such that a portion thereof protrudes from the opening edge (11a) of a paper bag body (11), that is opened to allow the removal of its content. The surface of the portion of the closure flap (14) that protrudes from the opening edge (11a) of the paper bag body (11) is coated with a non-water-soluble hot-melt adhesive (17). An underlining paper piece (20) is previously affixed, with a water-soluble adhesive (21), to the wall surface area where the closure flap (14) overlaps when it seals the opening of the paper bag by reactivating the hot-melt adhesive (17) on the surface of the closure flap (14), thus making it possible to peel this underlining paper piece (20) off from the wall surface (11c) of the paper bag body (11) together with a split part of the closure flap (14). This configuration makes it easy to remove all pieces of the paper bag to which the non-water-soluble adhesive is adhered before recycling process.

Abstract: A paper bag with a film inner bag in which the inner bag element is constructed so that its closed end portions can be torn in the lateral direction, thus allowing easy opening by hand across the entire width of the bag or across a part of this width. The inner bag element consists of a synthetic resin film and has cut portions formed along the longitudinal direction in the end portions of the bag that are closed by heat-sealing and that are planned to be opened in the future. The end portion constituting the bottom part is closed by heat-sealing, or by being folded together with the outer bag element or stitched with a sewing machine. The outer bag element, which consists of at least one layer, is formed mainly from craft paper. The synthetic resin film that forms the inner bag element is formed from a thermoplastic resin, and has the property of easy tearing in one axial direction.

Abstract: A paper bag is provided with a closure flap (14) such that a portion thereof protrudes from the opening edge (11a) of a paper bag body (11), that is opened to allow the removal of its content. The surface of the portion of the closure flap (14) that protrudes from the opening edge (11a) of the paper bag body (11) is coated with a non-water-soluble hot-melt adhesive (17). An underlining paper piece (20) is previously affixed, with a water-soluble adhesive (21), to the wall surface area where the closure flap (14) overlaps when it seals the opening of the paper bag by reactivating the hot-melt adhesive (17) on the surface of the closure flap (14), thus making it possible to peel this underlining paper piece (20) off from the wall surface (11c) of the paper bag body (11) together with a split part of the closure flap (14). This configuration makes it easy to remove all pieces of the paper bag to which the non-water-soluble adhesive is adhered before recycling process.