Method and apparatus for manufacturing draw tape bags
First Claim
1. 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.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
100 Citations
13 Claims
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1. A method of forming bag bodies comprising the steps of:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In an apparatus for forming bag bodies comprising feed means for feeding a continuous length of longitudinally foled material having a longitudinal fold edge connecting two adjoining material layers, each with a longitudinal free edge opposite the longitudinal fold edge, advancing means spaced from the feed means for advancing the length of folded material away from the feed means, and severing means for severing the advancing length of material transversely at regular intervals to provide individual bag body lengths the improvement comprising:
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hemming means between the feed means and advancing means for folding the longitudinal layer free edges inwardly between said adjoining layers to provide a pair of longitudinal hems of double layer thickness opposite said longitudinal foled edge; insertion means between the hemming means and advancing means for inserting a separate, continuous material strip into each hem; hem sealing means between said advancing means and said severing means for longitudinally joining together the double layer thickness of each hem to form a channel; and wherein said means for advancing advances said length of material continuously and uninterruptedly away from said feed means and through said hemming means and said insertion means. - View Dependent Claims (11, 12, 13)
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Specification