Resin sheet manufacturing method, standing bag manufacturing method, inflation molding die and standing bag

摘要

PPROBLEM TO BE SOLVED: To provide a standing bag which is a self-standing type suitable for applications such as a medical infusion bag and a closed type and prevents the contamination of bacteria and dust. PSOLUTION: A die 10 has a concentric double annular outlet port, a molten resin is extruded from the double annular outlet port under a pneumatic pressure, and outside and inside cylindrical films Fa and Fb are inflation-molded. The inflation-molded cylindrical films Fa and Fb, with their outsides and insides cooled by cooling water, are wound up as rolls R while being crushed in a sheet form. A sheet S from the roll R is split in the middle into two parts. Each of the cylindrical films Fa and Fb is opened to both sides along a cutting line. Each split film along the cutting line, the opposed surfaces of the cylindrical films Fa and Fb are welded together. A part to be the bottom of a bag is molded. In the longitudinal direction of the sheet, it is welded in the sheet width direction each bag width spacing in the double width of a side seal. Each bag is made by cutting in the middle of the double width. PCOPYRIGHT: (C)2010,JPO&INPIT