Adhesive closure bags and method for producing same

Claim 1

A method of making adhesive closure bags with Z-folded flaps which comprises the steps of: (a) J-folding a continuous plastic web to provide a superimposed folded portion on a flap portion; (b) surface treating at least one region of the flap portion to render said region more receptive to an adhesive than the remaining plastic in said web; (c) applying adhesive to said surface treated region; (d) Z-folding a part of said flap portion to cover said adhesive; (e) removing a portion of the Z-fold, at spaced intervals marking the longitudinal interfaces selected for dividing said web into a plurality of plastic bags; and (f) sever-sealing the J-fold in the region of said spaced intervals to seal and sever the longitudinal interface between individual bags of said plurality and thereby produce a plurality of Z-folded adhesive closure bags having unsealed Z-fold edges.

Claim 2

A method of making adhesive closure bags with Z-folded flaps which comprises the steps of: (a) J-folding a continuous plastic web to provide a superimposed folded portion on a flap portion; (b) surface treating at least one region of the flap portion to render said region more receptive to an adhesive than the remaining plastic in said web; (c) applying adhesive to said surface treated region; (d) Z-folding a part of said flap portion to cover said adhesive; (e) removing a portion of the Z-fold, at spaced intervals marking the longitudinal interfaces selected for dividing said web into a plurality of plastic bags; and (f) sever-sealing the J-fold in the region of said spaced intervals to seal and sever the longitudinal interface between individual bags of said plurality and thereby produce a plurality of Z-folded adhesive closure bags having unsealed Z-fold edges.

Claim 4

A method of making adhesive closure bags with Z-folded flaps which comprises the steps of: (a) C-folding a continuous plastic web to provide a pair of superimposed folded web portions joined by a flat web portion thereinbetween; (b) surface treating at least two regions of the flat web portion in said C-fold to render said regions more receptive to an adhesive than the remaining plastic in said web; (c) applying adhesive to said more receptive regions; (d) Z-folding portions of said flat web portion over said adhesive covered regions; (e) bisecting the C-folded web longitudinally along the flat web portion to produce two individual J-folded webs, each having one of said Z-folded portions, to thereby facilitate the simultaneous production of two tandem rows of bags; (f) removing a portion of the Z-folds, at spaced intervals marking the longitudinal interfaces selected for dividing each J-folded web into a plurality of plastic bags; (g) sever-sealing the J-fold in the region of said spaced intervals to seal and sever the longitudinal interface between individual plastic bags of said plurality and thereby produce a plurality of Z-folded adhesive closure bags having unsealed Z-fold edges.

Claim 5

A method of making adhesive closure bags with Z-folded flaps which comprises the steps of: (a) C-folding a continuous plastic web to provide a pair of superimposed folded web portions joined by a flat web portion thereinbetween; (b) surface treating at least two regions of the flat web portion in said C-fold to render said regions more receptive to an adhesive than the remaining plastic in said web; (c) applying adhesive to said more receptive regions; (d) Z-folding portions of said flat web portion over said adhesive covered regions; (e) bisecting the C-folded web longitudinally along the flat web portion to produce two individual J-folded webs, each having one of said Z-folded portions, to thereby facilitate the simultaneous production of two tandem rows of bags; (f) removing a portion of the Z-folds, at spaced intervals marking the longitudinal interfaces selected for dividing each J-folded web into a plurality of plastic bags; (g) sever-sealing the J-fold in the region of said spaced intervals to seal and sever the longitudinal interface between individual plastic bags of said plurality and thereby produce a plurality of Z-folded adhesive closure bags having unsealed Z-fold edges.