| 摘要 |
PURPOSE:To obtain strong bonding strength, by a method wherein both side ends of a bag member are bent so as to be opposed to each other on one lateral side thereof and, after an adhesive or sticking agent is applied, the bag member is bonded under pressure to be formed into a square tube shape and the opening part of the bag member is enlarged to apply an adhesive or sticking agent to the enlarged part while the enlarged part of the opening part is bent to be closed. CONSTITUTION:A sheet like bag member A is fed by a conveyor 9 and both side ends of the bag member A are bent by guide members 4, 4', guide rollers 5, 5' and sheet press members 6, 6' so as to be opposed to each other on one side thereof to form a square tube shape. An adhesive or sticking agent composed of a thermoplastic resin is applied to overlap widths by an emitting gun 10. The enlarged part of the bag member A is pressed by a press roller 24 and the adhesive or sticking agent is applied. The bottom piece parts of the opening part of the bag member A coated with the adhesive or sticking agent are successively folded by a folding bar 26 to be brought to a flat state. |
