Pre-opened resealable bags
A series of pre-opened resealable bags formed as a continuous web and received on a roll suitable for implementation in an automatic bagging machine are presented. The web of bags consist of top and bottom films thermally bonded together along the edges thereof. Transverse resealable zipper strips are interposed between the top and bottom films, with mating portions thereof respectively bonded to an associated films. A top film is provided with a filling slit, adapted for receiving product or materials therethrough. Appropriate seals and perforations are provided transverse to the web to allow the bags to be separated from each other and to allow for operator access to the resealable zipper strip. In another embodiment, the zipper strips are substituted or supplemented with plastic reinforcing strips to accommodate a punched hold for hanging display of the bag. A process for manufacturing such bags from a pair of webs received inserted zipper strips is also presented.
1. A method for making resealable bags for use in packaging equipment, comprising:
feeding top and bottom webs of film along a line in juxtaposition to each other;
inserting zipper seal strips between said top and bottom webs of film and transverse to said webs of film at spaced apart locations;
sealing selected areas of said top and bottom webs of film to each other and bonding respective portions of said zipper seal strips to said top and bottom webs of film, defining a composite web of interconnected resealable bags, each having a zipper seal strip at a first end thereof;
transversely slitting only one of said webs of film of each bag to provide a filling opening for each bag through only one side thereof, said filling opening of each bag being parallel to said zipper seal strip of said bag and at a second opposite end thereof; and
winding into a roll said composite web of interconnected resealable bags, each bag having a filling opening through only one side thereof.
2. The method for making resealable bags according to claim 1 further comprising the step of trimming said zipper seal strips along lateral edges of said webs.
3. The method of making resealable bags according to claim 2 further comprising the step of perforating said top and bottom webs along predetermined lines traversing said webs, defining lines of separation.