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    Three dimensional bag forming method and apparatus
    1.
    发明授权
    Three dimensional bag forming method and apparatus 失效
    三维袋形成方法和装置

    公开(公告)号：US3599538A

    公开(公告)日：1971-08-17

    申请号：US3599538D

    申请日：1969-05-07

    申请人： CONTINENTAL CAN CO

    发明人： PIAZZE THOMAS E

    IPC分类号： B29C65/74 ,  B31B19/64 ,  B31B1/22 ,  B31B45/00 ,  B31B49/04

    CPC分类号： B29C65/743 ,  B29C65/18 ,  B29C65/305 ,  B29C65/7441 ,  B29C65/749 ,  B29C66/1122 ,  B29C66/43 ,  B29C66/431 ,  B29C66/43121 ,  B29C66/81415 ,  B29C66/81457 ,  B29C66/8167 ,  B29C66/8221 ,  B29C66/832 ,  B29C66/8324 ,  B29C66/83411 ,  B29C2793/0009 ,  B29L2031/7128 ,  B31B70/14 ,  B31B70/64 ,  B31B70/642

    摘要： A method of fabricating side sealed square bottom bags from a web of heat sealable plastic film material wherein the web is folded upon itself with a bellows fold formed at the edge which has a width one-half the width of the bottom desired for the bag and the outside surfaces which overlie each other are treated so as to prevent sealing in the areas thereof in which the bottom forming seals are to be made, the folded web is advanced intermittently across a platen at a bottom seal forming station where a V-shaped hot knife device is operated to cut through the bellows fold margin at spaced intervals so as to form a bottom seal on each of two adjoining bag formations, the resultant triangular-shaped waste portion is discharged laterally of the path of advance of the web and the web is advanced for separation into successive bags by operation of a transverse hot knife sealing device which forms the side seals and separates the bags on a transverse line extending from the apex of the triangular waste portion. The bottom seal-forming device is in the form of an attachment comprising a platen, a V-shaped hot sealing knife mounted for cooperation with the platen and a means for disposing of the triangular waste chip resulting from the operation of the hot knife which comprises a driven roller and cooperating clamping rollers operating to close on the chip and remove the same in a direction laterally of the sealing station.