Cross-bottom or block-bottom valve sack

Details Cross-bottom or block-bottom valve sack Cross-bottom or block-bottom valve sack

B - Operations, Transporting

65

D

220/4

B65D 30/24 (2006.01) B65D 30/12 (2006.01)

Patent

CA 1323615

Abstract of The Disclosure A foldable bag material is formed into a bag having at least one end with a corner and having an end closure formed by the bag material which closes off the one end of the bag. A filter valve tube extends within the end closure at the one corner, the tube having an inner end disposed within the inter- ior of the bag such that the tube is adapted to receive a filler nozzle of a pneumatic filling device for filling the bag with a filling material. The tube has an inner end portion and an outer end portion, the inner end portion having a cross-sectional contraction which is contracted relative to the outer end por- tion such that the contracted inner end portion forms a seal with the filler nozzle, the tube being made at least partially of a filter material which is gas-permeable but which retains the filling material such that the gas-permeable material pro- vides for venting of the bag during filling.

591922

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