Abstract: To provide a gusseted tubular article made of heat-sealable resin for making a bag which is not liable to be broken in the heat-sealed section even when a heavy load is put in it and a gusseted composite tubular article on the outside of which a different material is put.

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 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.