Method of manufacturing carrier web zipper for gusset bags

Abstract

A method of forming carrier web having discrete lengths of mating zipper profile thereon. The zipper profile is fed from a supply roll to overlie a carrier web, tacked to the web and then severed from its supply roll.

1 - 3 . (canceled)  
     
     
         4 . A method of forming a carrier web assembly with axially spaced discrete sections of zipper profile thereon, comprising the steps of: 
 a) providing a zipper having mated profiles with one of said profiles above the other of said profiles so as to provide lower and upper profiles;    b) cutting a first discrete length of said zipper, and at a first station applying said lower one of said profiles of said first discrete length of zipper to a first carrier web;    c) moving said first carrier web with said applied zipper to a second station and applying a second carrier web onto the upper one of said profiles; and    d) sealing said lower one of said profiles to said first carrier web and said upper one of said profiles to said second carrier web.    
     
     
         5 . A method according to  claim 4  wherein said mated zipper profiles each has a flange and said flanges overlie and are adjacent to each other, and further comprising the step of maintaining said two flanges apart from each other while said zipper profiles are sealed to said first and second carrier webs respectively.  
     
     
         6 . A method according to  claim 5  comprising the further step of separating said two flanges from each other before either is sealed to either of said carrier webs.  
     
     
         7 . A method according to  claim 5  comprising wherein said lower and upper profile flanges are sealed respectively to said first and second carrier webs at substantially the same time.  
     
     
         8 . A method of forming a carrier web assembly with axially spaced discrete sections of zipper profile thereon comprising the steps of: 
 a) providing a carrier web,    b) providing a zipper element having a plurality of mating profile elements extending transversely there across,    c) cutting a discrete length of said zipper,    d) sealing said discrete length of zipper to said carrier web,    e) folding said carrier webs with attached zipper along a longitudinal axis approximately 180° forming first and second parts thereof, with said profile elements on said first part releasably engaging said profile elements on said second part.    
     
     
         9 . A method in accordance with  claim 8  comprising the further steps of slicing said carrier web and zipper elements along a longitudinal line to sever said first part from said second part.