| 摘要 |
A sack of a thermoplastic film comprising an open mouth region, a body region and a closed bottom region, said body region having at least one cold-stretched, circumferential band of reduced diameter therein. The method of forming such a sack comprising providing a sack of thermoplastic film; folding said bag at least once longitudinally so that the fold line is at least generally at right angles to the bag mouth opening; and at ambient temperature, applying a stretching force within at least one comparatively narrow band region across the folded bag, said stretching force being sufficient to neck-down the plastic film to a reduced diameter in relation to the original diameter of said bag.
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