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    • 7. 发明授权
    • Apparatus for forming flat bottom plastic bags
    • 用于形成平底塑料袋的装置
    • US3988970A
    • 1976-11-02
    • US600737
    • 1975-07-31
    • Violet M. HansonJohn E. Finn
    • Violet M. HansonJohn E. Finn
    • B31B1/94B31B29/00B31B37/00B31B33/00
    • B31B29/00B31B37/00B31B2201/922B31B2221/20B31B2221/407B31B2237/20B31B2237/60Y10S493/936
    • Flat bottom bags are formed from a supply of substantially endless plastic tubing, gusseted along two sides to form a flat reel. A sleeve of predetermined length is withdrawn from the reel and allowed to hang along a vertical plane between two foraminous plenum chambers which are then moved toward each other to squeeze the length therebetween. Simultaneously a sealing and shearing mechanism forms a transverse seal and cuts the sleeve length from the reel, the gussets being at the same time sealed in the seam. The plenum chambers are then subject to vacuum and are moved apart, causing the sides of the now formed bag to separate opening the same. Upon opening of the bag, a forming mandrel is inserted therein and moved through the length of the bag until it reaches the sealed end. Simultaneously a presser member is moved across the outside surface of the bag folding over the seam, and pressing the gusset portions into flat flaps and in addition forming simultaneously the flat bottom to the bag. The mandrel or the presser plate is provided with heat sealing means sealing the flaps to the sleeve sides.
    • 扁底袋由大量环形的塑料管供给形成,沿两侧嵌入以形成扁平卷轴。 预定长度的套筒从卷轴上取出并允许沿着垂直平面悬挂在两个有孔的增压室之间,然后这两个空腔室朝向彼此移动以挤压它们之间的长度。 同时,密封和剪切机构形成横向密封并且从卷轴切割套筒长度,角撑板同时被密封在接缝中。 然后,增压室经受真空并移动分开,使得现在形成的袋的侧面分开打开它们。 在打开袋子时,将成形心轴插入其中并移动通过袋子的长度,直到其到达密封端。 同时,压紧构件跨过袋的外表面移动,折叠在接缝上,并且将角撑部分压入平片中,并且另外将平底部同时形成到袋中。 心轴或压板设置有将翼片密封到套筒侧的热封装置。