发明名称 DRAW-CORD BAGS
摘要 A method and apparatus for producing draw-cord bags wherein a folded sheet of synthetic material is fed step-wise through an apparatus comprising means for folding the open edges of the sheet back upon themselves and producing a pair of seams, means for punching apertures therein, means for threading at least one draw-cord through each seam and means for producing and applying connectors to the ends of said draw-cords to produce an annular draw-cord, further means being provided for producing welded side edges for said bags and separating same from said sheet. The invention also relates to a draw-cord bag produced by the method and apparatus.
申请公布号 US3687357(A) 申请公布日期 1972.08.29
申请号 USD3687357 申请日期 1970.04.30
申请人 GERHARD HANSEN 发明人 GERHARD HANSEN
分类号 B31B19/90;B65D33/28;(IPC1-7):B65D33/28 主分类号 B31B19/90
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