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US 4,624,654 AGranted
Method and apparatus for manufacturing draw tape bags
AssigneeMobil Oil Corporation
InventorsDana M. Boyd, Franz Bustin
Life of this patent
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AssigneeMobil Oil Corporation
InventorsDana M. Boyd, Franz Bustin
Estimating the term…
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.
A method of forming bag bodies comprising the steps of:
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:
Dependencies are inferred from the claim text.