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    • 45. 发明授权
    • Tensionless seal apparatus and method
    • 无张力密封装置及方法
    • US4858416A
    • 1989-08-22
    • US81697
    • 1987-08-04
    • Alfred C. Monaghan
    • Alfred C. Monaghan
    • B65B9/02B65B51/26
    • B65B61/005B29C65/10B29C65/222B29C65/229B29C65/7433B29C65/7439B29C65/749B29C65/7873B29C66/0044B29C66/1122B29C66/133B29C66/4312B29C66/432B29C66/73921B29C66/8122B29C66/8161B29C66/83221B29C66/83543B29C66/836B29C66/849B29C66/93441B65B51/26B65B9/02B29C66/0042B29C66/81457
    • A packaging machine is provided for packaging bundles, optionally under compression, with tensionless cross-seals. One problem of conventional devices is that movable sealing bars tend to rupture film as it is pulled together around materials to be packaged, particularly if the materials are relatively high or heavy. Packaging products under compression is an additional challenge. In this instance, packages are generally fed substantially at a predetermined speed between upper and lower webs of film, which are then sealed at their sides. Compression of the products being packaged may be optionally practiced during such side seal formation, and later during cross seal formation. Subsequently, the products enclosed in the side-sealed web of films move into a cross seal area, optionally including a reciprocatable carriage, operation of which in effect causes the product being sealed to move backwards relative to seal bars forming a cross seal therefor. Such operation causes a reduction or elimination of tension in the films as the cross seal is created. Thereafter, the fully enclosed package is accelerated above its former predetermined speed so as to generally re-establish an original degree of longitudinal separation between products moving through the packaging machine.
    • 提供包装机,用于包装束,可选地在压缩下,具有无张力的十字密封。 常规装置的一个问题是可移动密封条在膜被围绕要包装的材料一起拉动时倾向于使膜破裂,特别是如果材料相对较高或较重。 包装产品在压缩下是一个额外的挑战。 在这种情况下,包装通常基本上以预定的速度在上部和下部薄膜之间进料,然后在其两侧密封。 包装产品的压缩可以在这种侧面密封形成期间,随后在交叉密封形成期间可选地进行。 随后,包封在侧密封薄膜网中的产品移动到十字密封区域中,可选地包括可往复运动的托架,其操作实际上使密封产品相对于形成十字密封件的密封条向后移动。 当产生交叉密封时,这种操作导致膜中张力的减小或消除。 此后,全封闭包装被加速到高于其原来的预定速度,以便通常重新建立移动通过包装机的产品之间的原始纵向间隔程度。