| 摘要 |
Draw band closure bags are made from pliable sheet material folded and sealed into bag form and provided with tubular lip tunnel formation within which a flat draw band comprising only the flexible sheet material initially connected but partially separated along a longitudinal line along one edge thereof with a strip of material enclosed within the tunnel and separable therefrom when the draw band is pulled through an opening provided by incising or nicking a limited portion of the sheet material at the tunnel. In one embodiment a flexible draw band strip is assembled with the sheet material and enfolded in the tunnel. In another embodiment material of the bag body portion which is to form the mouth end of the bag is initially partially separated along one or more lines parallel to its edge to provide for the draw band and is then enclosed either within a separately formed tunnel-providing folded over piece of flexible material heat-sealed to the bag body, or is enclosed within a tunnel made from the bag body material by folding the same upon itself with the draw band portion on the terminal part of the folded material.
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