| 摘要 |
<p>Plastics bag with ventilation perforations is made of evenly thick film. There is one carrying loop at either side of the opening defined by an integral extension of the bag-forming film, thus connecting front and back of the bag. The bag has side gussets. Between the carrying loops and the gussets there is a perforated zone of both front and back. The perforations are circular and have rims of circular cross-section so that the strength of the film material is not impaired by any protruding or undercut corners or edges. Strength of the bag is not affected by the perforations. The bag may be made of e.g. H.</p> |
