| 摘要 |
A flexible paper bag suited for containing granular products includes an improved valve in a corner of one end thereof which is adapted to receive a filler spout of a product dispensing machine therein. The valve comprises a tubular plastic sleeve interposed in an opening between opposing, hinged bottom flaps of the bag. The bottom flaps shift about their hinges toward each other under weight of product within the bag to collapse the sides of the sleeve valve, thereby closing the latter. One extremity of the sleeve valve, which extends into and is freely suspended within the bag, acts as a self sealing valve while the bag is being filled. Shifting of the product within the bag after filling thereof folds the sleeve over onto itself, thereby positively closing the sleeve valve.
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