Method of manufacturing bags

Claim 1

THE METHOD OF MANUFACTURING PINCH-CLOSURE BAGS COMPRISING COMBINING TWO CONTINUOUS WEBS OF BAG MATERIAL TO FORM A MULTI-PLY WEB AND FORMING THE MULTI-PLY WEB INTO CONTINOUOS MULTI-PLY BAG TUBING BY FOLDING THE MULTI-PLY WEB ON LONGITUDINAL FOLD LINES SPACED INWARD FROM ITS SIDE EDGES TO BRING SAID SIDE EDGES INTO OVERLAPPING RELATION AND SEAMING SAID OVERLAPPING SIDE EDGES TO FORM A LONGITUDINAL SEAM OF THE TUBING, THE TUBING THEREBY HAVING A FRONT WALL BETWEEN SAID LONGITUDINAL FOLD LINES AND A BACK WALL INCLUDING THE LONGITUDINAL SEAM, A FIRST OF THE WEBS FORMING THE INNERMOST PLY OF THE TUBING AND THE SECOND FORMING THE OUTER PLY OF THE TUBING, EACH WEB HAVING LINES OF WEAKNESS EXTENDING THEREACROSS SPACED AT BAG TUBE LENGTH INTERVALS ALONG ITS LENGTH, EACH LINE OF WEAKNESS BEING A STEPPED LINE HAVING A CENTRAL PORTION EXTENDING BETWEEN SAID LONGITUDINAL FOLD LINES IN THE RESPECTIVE WEB AND SIDE PORTIONS BOTH OFFSET IN THE SAME DIRECTION FROM THE CENTRAL PORTION EXTENDING FROM THE LONGITUDINAL FOLD LINES TO THE SIDE EDGES OF THE WEB AND ALIGNED TRANSVERSELY OF THE WEB, WITH STEPS BETWEEN THE ENDS OF THE CENTRAL PORTION AND THE INNER ENDS OF SAID SIDE PORTIONS, THE OFFSET IN THE LINES OF WEAKNESS OF THE FIRST WEB BEING LESS THAN THE OFFSET IN THE LINES OF WEAKNESS OF THE SECOND WEB, THE FIRST AND SECOND WEBS BEING COMBINED SO THAT, AT BAG TUBE LENGTH INTERVALS, THE MULTI-PLY WEB HAS A LINE OF WEAKNESS OF THE FIRST WEB GROUPED WITH A LINE OF WEAKNESS OF THE SECOND WEB, WITH THE ARRANGEMENT OF THE LINES IN EACH GROUP SUCH THAT THE SIDE PORTIONS OF THE LINE OF WEAKNESS OF THE FIRST WEB ARE OFFSET IN ONE DIRECTION FROM THE SIDE PORTIONS OF THE LINE OF WEAKNESS OF THE SECOND WEB, THE CENTRAL PORTION OF THE LINE OF WEAKNESS OF THE FIRST WEB IS OFFSET IN THE SAME DIRECTION FROM THE SIDE PORTIONS THEREOF, AND THE CENTRAL PORTION OF THE LINE OF WEAKNESS OF THE SECOND WEB IS OFFSET IN THE SAME DIRECTION FROM THE CENTRAL PORTION OF THE LINE OF WEAKNESS OF THE FIRST WEB, SAID TUBING THEREBY HAVING GROUPS OF LINES OF WEAKNESS SPACED AT BAG TUBE LENGTH INTERVALS WITH EACH GROUP COMPRISING A FIRST LINE EXTENDING ACROSS THE OUTER PLY OF ONE WALL OF THE TUBING, A SECOND LINE LONGITUDINALLY OFFSET IN ONE DIRECTION FROM THE FIRST LINE EXTENDING ACROSS THE INNERMOST PLY OF SAID ONE WALL, A THIRD LINE LONGITUDINALLY OFFSET IN THE SAME DIRECTION FROM THE SECOND LINE EXTENDING ACROSS THE INNERMOST PLY OF THE OTHER WALL OF THE TUBING, AND A FOURTH LINE LONGITUDINALLY OFFSET IN THE SAME DIRECTION FROM THE THIRD LINE EXTENDING ACROSS THE OUTER PLY OF SAID OTHER WALL, SEGMENTING SAID TUBING AT SAID LINES OF WEAKNESS AND THEREBY FORMING INDIVIDUAL BAG TUBES EACH OF WHICH HAS AT LEAST AT ONE END THEREOF A STEPPED FORMATION IN WHICH THE INNERMOST PLY OF ONE WALL HAS AN EXTENSION IN ONE DIRECTION BEYOND THE OUTER PLY OF SAID ONE WALL FOR THE FULL WIDTH OF THE BAG, THE INNERMOST PLY OF THE OTHER WALL HAS AN EXTENSION IN THE SAME DIRECTION BEYOND THE INNERMOST PLY OF SAID ONE WALL FOR THE FULL WIDTH OF THE BAG, AND THE OUTER PLY OF SAID OTHER WALL HAS AN EXTENSION IN THE SAME DIRECTION BEYOND THE INNERMOST PLY OF SAID OTHER WALL FOR THE FULL WIDTH OF THE BAG, FOLDING OVER THE STEPPED FORMATION ON A FOLD LINE GENERALLY COINCIDENT WITH THE END EDGE OF THE OUTER PLY OF SAID ONE WALL WITH SAID EXTENSIONS FACE TO FACE WITH THE OUTSIDE OF THE OUTER PLY OF SAID ONE WALL, AND ADHERING THE FOLDED STEPPED FORMATION TO THE OUTER PLY OF SAID ONE WALL THEREBY TO FORM A PINCH END CLOSURE.

Claim 2

THE METHOD OF MANUFACTURING PINCH-CLOSURE BAGS COMPRISING COMBINING TWO CONTINUOUS WEBS OF BAG MATERIAL TO FORM A MULTI-PLY WEB AND FORMING THE MULTI-PLY WEB INTO CONTINOUOS MULTI-PLY BAG TUBING BY FOLDING THE MULTI-PLY WEB ON LONGITUDINAL FOLD LINES SPACED INWARD FROM ITS SIDE EDGES TO BRING SAID SIDE EDGES INTO OVERLAPPING RELATION AND SEAMING SAID OVERLAPPING SIDE EDGES TO FORM A LONGITUDINAL SEAM OF THE TUBING, THE TUBING THEREBY HAVING A FRONT WALL BETWEEN SAID LONGITUDINAL FOLD LINES AND A BACK WALL INCLUDING THE LONGITUDINAL SEAM, A FIRST OF THE WEBS FORMING THE INNERMOST PLY OF THE TUBING AND THE SECOND FORMING THE OUTER PLY OF THE TUBING, EACH WEB HAVING LINES OF WEAKNESS EXTENDING THEREACROSS SPACED AT BAG TUBE LENGTH INTERVALS ALONG ITS LENGTH, EACH LINE OF WEAKNESS BEING A STEPPED LINE HAVING A CENTRAL PORTION EXTENDING BETWEEN SAID LONGITUDINAL FOLD LINES IN THE RESPECTIVE WEB AND SIDE PORTIONS BOTH OFFSET IN THE SAME DIRECTION FROM THE CENTRAL PORTION EXTENDING FROM THE LONGITUDINAL FOLD LINES TO THE SIDE EDGES OF THE WEB AND ALIGNED TRANSVERSELY OF THE WEB, WITH STEPS BETWEEN THE ENDS OF THE CENTRAL PORTION AND THE INNER ENDS OF SAID SIDE PORTIONS, THE OFFSET IN THE LINES OF WEAKNESS OF THE FIRST WEB BEING LESS THAN THE OFFSET IN THE LINES OF WEAKNESS OF THE SECOND WEB, THE FIRST AND SECOND WEBS BEING COMBINED SO THAT, AT BAG TUBE LENGTH INTERVALS, THE MULTI-PLY WEB HAS A LINE OF WEAKNESS OF THE FIRST WEB GROUPED WITH A LINE OF WEAKNESS OF THE SECOND WEB, WITH THE ARRANGEMENT OF THE LINES IN EACH GROUP SUCH THAT THE SIDE PORTIONS OF THE LINE OF WEAKNESS OF THE FIRST WEB ARE OFFSET IN ONE DIRECTION FROM THE SIDE PORTIONS OF THE LINE OF WEAKNESS OF THE SECOND WEB, THE CENTRAL PORTION OF THE LINE OF WEAKNESS OF THE FIRST WEB IS OFFSET IN THE SAME DIRECTION FROM THE SIDE PORTIONS THEREOF, AND THE CENTRAL PORTION OF THE LINE OF WEAKNESS OF THE SECOND WEB IS OFFSET IN THE SAME DIRECTION FROM THE CENTRAL PORTION OF THE LINE OF WEAKNESS OF THE FIRST WEB, SAID TUBING THEREBY HAVING GROUPS OF LINES OF WEAKNESS SPACED AT BAG TUBE LENGTH INTERVALS WITH EACH GROUP COMPRISING A FIRST LINE EXTENDING ACROSS THE OUTER PLY OF ONE WALL OF THE TUBING, A SECOND LINE LONGITUDINALLY OFFSET IN ONE DIRECTION FROM THE FIRST LINE EXTENDING ACROSS THE INNERMOST PLY OF SAID ONE WALL, A THIRD LINE LONGITUDINALLY OFFSET IN THE SAME DIRECTION FROM THE SECOND LINE EXTENDING ACROSS THE INNERMOST PLY OF THE OTHER WALL OF THE TUBING, AND A FOURTH LINE LONGITUDINALLY OFFSET IN THE SAME DIRECTION FROM THE THIRD LINE EXTENDING ACROSS THE OUTER PLY OF SAID OTHER WALL, SEGMENTING SAID TUBING AT SAID LINES OF WEAKNESS AND THEREBY FORMING INDIVIDUAL BAG TUBES EACH OF WHICH HAS AT LEAST AT ONE END THEREOF A STEPPED FORMATION IN WHICH THE INNERMOST PLY OF ONE WALL HAS AN EXTENSION IN ONE DIRECTION BEYOND THE OUTER PLY OF SAID ONE WALL FOR THE FULL WIDTH OF THE BAG, THE INNERMOST PLY OF THE OTHER WALL HAS AN EXTENSION IN THE SAME DIRECTION BEYOND THE INNERMOST PLY OF SAID ONE WALL FOR THE FULL WIDTH OF THE BAG, AND THE OUTER PLY OF SAID OTHER WALL HAS AN EXTENSION IN THE SAME DIRECTION BEYOND THE INNERMOST PLY OF SAID OTHER WALL FOR THE FULL WIDTH OF THE BAG, FOLDING OVER THE STEPPED FORMATION ON A FOLD LINE GENERALLY COINCIDENT WITH THE END EDGE OF THE OUTER PLY OF SAID ONE WALL WITH SAID EXTENSIONS FACE TO FACE WITH THE OUTSIDE OF THE OUTER PLY OF SAID ONE WALL, AND ADHERING THE FOLDED STEPPED FORMATION TO THE OUTER PLY OF SAID ONE WALL THEREBY TO FORM A PINCH END CLOSURE.