초록 ▼

A method for sealing a zipper assembly to bag making film at three or more points. The zipper assembly comprises a short zipper flange and a long zipper flange. The short flange is joined to one wall of the package while the long flange is joined to both walls of the package to define a product spac

A method for sealing a zipper assembly to bag making film at three or more points. The zipper assembly comprises a short zipper flange and a long zipper flange. The short flange is joined to one wall of the package while the long flange is joined to both walls of the package to define a product space in which the product is contained. Both the short and long zipper flanges are sealed to the bag making film at a first sealing station prior to folding of the film. After folding, the long zipper flange is sealed at one or more zones of joinder to the other side of the folded film. If the zipper assembly is attached in proximity to the fold line, then the second sealing operation is performed before filling and the bag is filled through the package bottom. If the zipper assembly is attached near the edge of the web of bag making film, then the second sealing operation is performed after the filling operation.

대표청구항 ▼

What is claimed is: 1. A method of manufacturing a package, comprising the following steps: (a) placing a zipper assembly on a web of bag making film, said zipper assembly comprising first and second flanges, said second flange having a length greater than the length of said first flange; (b) join

What is claimed is: 1. A method of manufacturing a package, comprising the following steps: (a) placing a zipper assembly on a web of bag making film, said zipper assembly comprising first and second flanges, said second flange having a length greater than the length of said first flange; (b) joining a portion of said first zipper flange to said web of bag making film along a first zone of joinder; (c) joining a first portion of said second zipper flange to said web of bag making film along a second zone of joinder spaced apart from said first zone of joinder and generally parallel thereto; (d) folding said web of bag making film along a fold line that runs generally parallel to and is located in proximity to said assembly, said assembly being sandwiched between a first portion of said web of bag making film extending on one side of said fold line and a second portion of said web of bag making film extending on the other side of said fold line, said first and second zones of joinder being located on said first portion of said web of bag making film; (e) joining a second portion of said second zipper flange to said second portion of said web of bag making film along a third zone of joinder; (f) joining said first and second portions of said web of bag making film along fourth and fifth zones of joinder that begin at spaced apart sections of said fold line and run in parallel with each other and generally perpendicular to said fold line, the terminations of said fourth and fifth zones of joinder demarcating the ends of an open end of the receptacle thus formed; (g) joining a third portion of said second zipper flange to said second portion of said web of bag making film along a sixth zone of joinder spaced apart from said third zone of joinder and generally parallel thereto; and (h) after all of the foregoing steps have been performed, filling said receptacle with material via said open end, wherein said second zipper flange comprises a web having first and second sides, said second, third and sixth zones of joinder being on said first side of said second zipper flange. 2. The method as recited in claim 1, further comprising the step of joining said first and second portions of said web of bag making film along a seventh zone of joinder that closes said open end. 3. The method as recited in claim 1, further comprising the step of cutting said first and second portions of said web of bag making film along said fourth and fifth zones of joinder to separate the package from said web of bag making film. 4. The method as recited in claim 1, wherein steps (b) and (c) are performed concurrently during a first sealing operation performed prior to step (d). 5. The method as recited in claim 1, further comprising the step, performed prior to step (a), of forming a tear line in a fourth portion of said second zipper flange located between said first and second portions of said second zipper flange. 6. The method as recited in claim 1, further comprising the step, performed prior to step (a), of inserting sliders at spaced intervals on said zipper assembly. 7. The method as recited in claim 1, further comprising the step of joining said first and second portions of said web of bag making film along a seventh zone of joinder adjacent said fold line. 8. The method as recited in claim 1, further comprising the steps of forming first and second tear lines in said first and second portions of said web of bag making film respectively. 9. The method as recited in claim 8, wherein said first and second tear lines are formed in said web of bag making film prior to step (a). 10. The method as recited in claim 9, wherein said first and second tear lines are equidistant from and on opposing sides of said fold line. 11. A method of manufacturing a package, comprising the following steps: (a) placing a zipper assembly on a web of bag making film, said zipper assembly comprising first and second flanges, said second flange having a length greater than the length of said first flange; (b) joining a portion of said first zipper flange to said web of bag making film along a first zone of joinder; (c) joining a first portion of said second zipper flange to said web of bag making film along a second zone of joinder spaced apart from said first zone of joinder and generally parallel thereto; (d) folding said web of bag making film along a fold line that runs generally parallel to said assembly, said assembly being sandwiched between a first portion of said web of bag making film extending on one side of said fold line and a second portion of said web of bag making film extending on the other side of said fold line, said first and second zones of joinder being located on said first portion of said web of bag making film; (e) joining said first and second portions of said web of bag making film along third and fourth zones of joinder that begin at spaced apart sections of said fold line and run in parallel with each other and generally perpendicular to said fold line, the terminations of said third and fourth zones of joinder demarcating the ends of an open end of the receptacle thus formed; (f) filling said receptacle with material via said open end; (g) joining a second portion of said second zipper flange to said second portion of said web of bag making film along a fifth zone of joinder after said filling step; and (h) joining a third portion of said second zipper flange to said second portion of said web of bag making film along a sixth zone of joinder spaced apart from said fifth zone of joinder and generally parallel thereto after said filling step, wherein said second zipper flange comprises a web having first and second sides, said second, fifth and sixth zones of joinder being on said first side of said second zipper flange. 12. The method as recited in claim 11, wherein steps (b) and (c) are performed concurrently.