| 摘要 |
PURPOSE:To facilitate opening without a cutter, by a method in which two layers of one of polyolefine, polyamid, or polyester substrate film whose thickness is equal to or less than the specific value and water-vapor permeability is equal to or less than the specific value, are fused at the end of the film, thereby forming a sealed part, and a cutting line seal which crosses the space of the sealed part is formed. CONSTITUTION:At both ends, top and bottom, of a tubular body 1 made of a film are sealed parts 2 and 3 in which the two layers of the film are fused. As the film for the body 1, a polyolefine, polyamide, or polyester plastic film whose thickness is 100mum or less and water-vopor permeability is 1.0g/cm<2>/24 hours or less is selected. In the upper sealed part 2, a cutting line seal C is made sideways via and in a space 4 extending conically from the inside of the body 1 toward the middle part of the upper sealed part 2 in the direction of its width. Thus, flexibility is imparted to a packing bag, and compressibility, when pressure is exerted, can be improved. |
