Abstract: The present invention provides a highly mass-productive and versatile expansion sheet body, an expansible package, and packaging method. A plurality of cells 22 defined by cell seals 41 for joining overlapped films together are arranged so as to be adjacent to each other, and a fluid is introduced from the upstream side into the cells 22, thereby expanding the cells 33. At least one of the cells 22 is provided with an unexpanded region 36 in the mid-stream section in the midway from the upstream side to the downstream side. A cell seal 41 in a region downstream of the unexpanded region 36 is provided with a connection part which permits flowing of the fluid between the cell seal 41 and an adjacent cell seal 41. The unexpanded region 36 is used as a placement part 26 for a plane sheet 25 and an overlapped part 27.

Abstract: A cubiform cushioning medium 4 comprises a planar cushioning medium 1 with a plurality of cells 12 formed by partially bonding non-breathable flexible resin sheets and the cells 12 which air is encapsulated thereinside, and the planar cushioning medium 1 is folded and bonded partially to complete an opening A to be protected for containing. The cubiform cushioning medium 4 thus has lateral cushioning faces 31, 34 disposed at the side of the opening 42 and an bottom cushioning portion 35 disposed at the bottom of the opening 42 by bending the planar cushioning medium 1 at the bottom end of the lateral cushioning mediums 31, 34 so that the end cushioning medium 35 is folded upward to the top of the lateral cushioning mediums 31, 34.

Abstract: A check valve that allows opening of the fluid path by hand alone, that is capable of passing a fluid in a simple and quick manner, that keeps the appearance of the check valve unaffected, and that are unlikely to result in accidental fluid leakages, and a bag equipped with the check valve are provided. The check valve comprises handling portions with less flexibility than the exterior sheets, the handling portions being formed at an opening portion on the manual opening side of the fluid path, wherein the fluid path can be manually opened by pinching and squeezing the handling portions to come close each other.

Abstract: In order to provide an air passage structure and an air-filling cushioning material using the same which facilitates an air-supplying operation via an air passage and does not increase in the production costs in comparison with the conventional one. An air passage structure is provided for a bag 1 that is formed with flexible sheets 1a, 1b by adhering the overlapped sheets 1a, 1b at predetermined spots, comprising a closed portion 2 having a space where air can be circulated, and an air passage 3 for passing air between the outside of the bag 1 and the closed portion 2, wherein the air passage 3 is provided with an enlarged portion 31 having an opening portion 3a opened to the outside of the bag 1, and the enlarged portion 31 is formed by enlargement of the air passage 3 by deforming at least one of the sheets.

Abstract: A cubiform cushioning medium 4 comprises a planar cushioning medium 1 with a plurality of cells 12 formed by partially bonding non-breathable flexible resin sheets and the cells 12 which air is encapsulated thereinside, and the planar cushioning medium 1 is folded and bonded partially to complete an opening A to be protected for containing. The cubiform cushioning medium 4 thus has lateral cushioning faces 31, 34 disposed at the side of the opening 42 and an bottom cushioning portion 35 disposed at the bottom of the opening 42 by bending the planar cushioning medium 1 at the bottom end of the lateral cushioning mediums 31, 34 so that the end cushioning medium 35 is folded upward to the top of the lateral cushioning mediums 31, 34.