| 摘要 |
A multi-ply, gusseted, stepped end, pinch bottom bag is disclosed which includes a sleeved valve in a corner of one end for receiving a filling spout from a product dispensing machine. The valve is completely sift-proof and is constructed without making changes in the cut shape and relationship of the various plies of the bag to accommodate the valve sleeve. The bag is made from a plurality of plies of flexible material, such as kraft paper, which are cut and scored to permit a multiwall, gusseted, stepped end, pinch bottom bag to be formed and to further permit a valve area to be formed at one corner when the front wall, rear wall and gusset panels in that region are infolded. The valve sleeve which is inserted into the valve area includes a tuck-in flap which is sized and shaped to correspond to the pocket formed when the wall and gusset panels are folded back against the inside walls of the bag. When the bag is being assembled, the tuck-in flap is inserted into the pocket, aligned with the fold lines defining the bottom and side edges of the pocket and secured therein by a suitable adhesive.
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