초록 ▼

Packages being produced on a form, fill and seal machine as provided with transverse zippers inserted thereinto through a fin seal gap. Pairs of fin sealing bars are separated by a gap to produce the fin seal gap. The fin seal gap is opened, perhaps by vacuum means, and a zipper probe inserts a zipp

Packages being produced on a form, fill and seal machine as provided with transverse zippers inserted thereinto through a fin seal gap. Pairs of fin sealing bars are separated by a gap to produce the fin seal gap. The fin seal gap is opened, perhaps by vacuum means, and a zipper probe inserts a zipper having a web into the tube of plastic sheet material being formed into bags. The web of the zipper is sealed to the plastic sheet material, and the zipper probe withdrawn from the tube. Cross seal jaws seal both transverse ends of the package, a knife separates each package from that previously made, and a fin gap sealer seals the fin seal gap to complete the manufacture.

대표청구항 ▼

An apparatus for the manufacture of plastic bags on a form, fill and seal machine which includes a longitudinally extending filling tube and a forming collar for guiding a plastic sheet material having lateral edges into the form of a tube having a longitudinally fin formed by said lateral edges abo

An apparatus for the manufacture of plastic bags on a form, fill and seal machine which includes a longitudinally extending filling tube and a forming collar for guiding a plastic sheet material having lateral edges into the form of a tube having a longitudinally fin formed by said lateral edges about said filling tube, said apparatus comprising: a first pair of longitudinal fin sealing bars and a second pair of longitudinal fin sealing bars, said first and second pairs of longitudinally fin sealing bars being longitudinally separated from one another by a transverse gap, so that, when said tube is sequentially advanced in increments equal to a longitudinal dimension of a package, a transverse fin seal gap will remain when the first and second sealing bars seal said fin; means for opening said transverse fin seal gap, said means being at a first position downstream from said gap between said first and second pairs of fin sealing bars a distance equal to a whole number multiple of said longitudinal dimension of a package; and means for inserting a preselected length of zipper into said transverse gap of said tube, said means for inserting being at said first position with said means for opening said transverse fin seal gap.