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    • 10. 发明授权
    • Draw tape bag and method of manufacture
    • 卷带和制造方法
    • US06561696B1
    • 2003-05-13
    • US08834225
    • 1997-04-15
    • John E. RusnakRobert W. FraserJack F. Melvan
    • John E. RusnakRobert W. FraserJack F. Melvan
    • B65D3328
    • B65D33/28
    • A plastic draw tape bag includes a non-destructive hem seal which runs along the width of the bag to secure the draw tape. The seal is created by bonding two layers of film by using an adhesive, a hot seal, or a coextruded film. When stressed by adequate forces, the seal will partially open without tearing the film. However, it will open only to the extent that the load exceeds the seal strength. Once the film absorbs the load and the stress is relieved, the seal will stop opening and the remaining portion of the seal will remain intact. Thus, the stress concentration is dissipated without tearing the film at or near the seal. As a result, the bag will fail only when the forces on the bag exceed the load bearing limit of the film.
    • 塑料拉带袋包括沿着袋的宽度延伸以固定拉带的无损折边密封件。 通过使用粘合剂,热密封或共挤出膜粘合两层膜来产生密封。 当受到足够的力量的压力时,密封将部分打开而不撕裂胶片。 但是,只有在负载超过密封强度的情况下才会打开。 一旦薄膜吸收负载并释放应力,密封件将停止打开,并且密封件的剩余部分将保持不变。 因此,应力集中不会在密封处或附近撕裂薄膜而消散。 因此,只有当袋上的力超过胶片的承载极限时,包才会失效。