| 摘要 |
Valve bags having a vent for exit of air from the bag as it is filled, with a filter for the vent incorporated in the bag as part of the bag for preventing escape of product from the bag. In each of two types of bag disclosed, the filter is formed as a pocket for receiving a vacuum member for evacuating air from the bag through the filter. In one of these two types, the valve is at a corner at one end of the bag and the pocket is at the opposite corner at this end. In the other, the valve and pocket are at one and the same corner, the pocket being under the valve. In a third type of bag disclosed, the filter is part of a valve sleeve for the bag.
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