초록 ▼

A method for making a reclosable bag ( 56 ) with gussets ( 36, 38 ) in which a zipper profile ( 16 ) is attached to bag-making film ( 10 ), while leaving side margins ( 20, 22 ) of the film. The film ( 10 ) is folded as a tube ( 26 ). Gusset-forming wheels ( 34, 35 ) indent the tube ( 26 ) to form t

A method for making a reclosable bag ( 56 ) with gussets ( 36, 38 ) in which a zipper profile ( 16 ) is attached to bag-making film ( 10 ), while leaving side margins ( 20, 22 ) of the film. The film ( 10 ) is folded as a tube ( 26 ). Gusset-forming wheels ( 34, 35 ) indent the tube ( 26 ) to form the side gussets ( 36, 38 ). The side gussets ( 36, 38 ) are sealed to the tube ( 26 ) and/or the zipper profile ( 18 ) with the profile sealed to the tube. The tube ( 26 ) is sealed and cross-cut to form the bag ( 56 ). In an alternative method, lengths of tubular gusset material ( 112 ) are positioned on a lower web ( 110 ) of film ( 101 ) transverse to a bag-forming direction. A zipper ( 124 ) is sealed in the bag-forming direction to the webs ( 108, 110 ), and the gusset material ( 112 ). The webs ( 108, 110 ) and the material ( 112 ) are sealed to each other to form an end seal ( 140 ) as well as cross-cut and sealed to form the gussets ( 144, 148 ) of a reclosable bag ( 147 ). The webs ( 108, 110 ) may be sealed above the zipper ( 124 ) to form a tamper-evident feature ( 166 ).

대표청구항 ▼

1. A method for producing a reclosable gusseted bag comprising the steps of:advancing a length of bag-making film in a bag-forming direction;supplying a length of zipper having first and second interlockable profiles joined by their interlocking elements;attaching the first profile of said length of

1. A method for producing a reclosable gusseted bag comprising the steps of:advancing a length of bag-making film in a bag-forming direction;supplying a length of zipper having first and second interlockable profiles joined by their interlocking elements;attaching the first profile of said length of zipper to a mid-portion of said bag-making film transverse to said bag-forming direction, leaving sides of said bag-making film as side margins from opposite ends of said zipper;sealing the side margin from one end of said zipper together with the side margin of the other end of said zipper in a fin seal to form a tube;indenting said sealed side margins of the tube toward said zipper ends to form at least one side gusset in each said side margin, a base of said at least one side gusset bordering a rear wall of said tube;sealing the second profile of said zipper to a face of said at least one side gusset and to a surface of said rear wall facing the interior of said tube;sealing an opposite face of said at least one side gusset in alignment with said zipper to said surface of the rear wall;sealing across said tube at spaced intervals to form a first end seal; andcutting across said tube at spaced intervals on opposite sides of said zipper to form a reclosable bag. 2. The method in accordance with claim 1 wherein said at least one side gusset is sealed adjacent the interlocking elements of said first and second profiles. 3. The method in accordance with claim 2, said method including the additional step of filling the reclosable bag with a consumer product. 4. The method in accordance with claim 3, said method including the additional steps of:sealing across said tube to form a second end seal on the opposite side of said zipper from said at least one side gusset; andcreating a weakness area in said tube between said second end seal and said at least one side gusset.