| 摘要 |
Square ended valve bags are formed from a tube-like band and in a chain with the back wall and top end of each bag partially sealed together to provide bags between the seals. Patches are placed on the top end of the bag and the patches and top ends are provided with displaced openings to provide a valve. Each bag in turn may be filled through the valve located in the top end, the bag expanding forwardly from the back wall by expanding gussets in the top and bottom ends.
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