| 摘要 |
A self-sealing bag (10) is provided with a valve-type arrangement which is operative when the bag is filled to substantially prevent or restrict the egress of the contents from the bag. The valve-type arrangement comprises a flexible sheet of material (15) juxtaposed with a portion of the bag in which a slit (14) is formed. The sheet of material (15) is joined to the bag around the slit (14), but a portion of the sheet, spaced from the slit (14) is not joined to the bag to thereby provide an opening. The bag may be filled by inserting a nozzle or spout through the opening and into the slit. On removal of the filling nozzle, the contents of the bag (10) bias the side of the bag against the sheet of material (15), thereby automatically closing the bag. The bags (10) may be formed form a continuous roll of flat tubular material (20), the sheet (15) being heat-sealed to one side of the tubular material (20). To prevent sealing through to the opposite side of the material (20), a floating board is located within the tubular material (20). |
