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A method of forming plastic film bag bodies with draw strips comprises the steps of providing a continuous length of plastic film once folded to provide superposed panels and two free longitudinal edges opposite a fold edge, folding the two longitudinal free edges inwardly between the adjoining pane

A method of forming plastic film bag bodies with draw strips comprises the steps of providing a continuous length of plastic film once folded to provide superposed panels and two free longitudinal edges opposite a fold edge, folding the two longitudinal free edges inwardly between the adjoining panels to provide a pair of longitudinal inwardly turned hems of double thickness, inserting a continuous material draw strip into each hem, joining together longitudinally the double layer thicknesses of each hem to form a channel along a longitudinal edge of each panel containing one of the continuous strips and transversely severing the material and strips at regular intervals to separate individual bag body lengths from the continuous web of material. Holes are punched along the folded hems of the bag before the draw tapes are inserted so as to allow access to the inserted tapes in the manufactured bag.

대표청구항 ▼

A method of forming bag bodies comprising the steps of: providing a continuous length of pliable bag material folded once longitudinally and having a longitudinal fold edge, and two adjoining material layers each with longitudinal free edge opposite the longitudinal fold edge; folding the two longit

A method of forming bag bodies comprising the steps of: providing a continuous length of pliable bag material folded once longitudinally and having a longitudinal fold edge, and two adjoining material layers each with longitudinal free edge opposite the longitudinal fold edge; folding the two longitudinal free edges inwardly between said adjoining layers to provide a pair of longitudinal hems of double layer thickness opposite said longitudinal fold edge; inserting a separate, continuous material strip into each hem, said pliable bag material being continuously and uninterruptedly advanced through said folding and inserting steps; longitudinally joining together the double layer thicknesses of each hem to form a channel along the longitudinal edge of each layer opposite the longitudinal fold containing one of the continuous strips; and transversely severing the pliable bag material and strips at regular intervals along the length of the pliable bag material to separate individual bag body lengths from the continuous length of pliable bag material.