Method of making bottom gusset bag pad arrangement for liquid containers

In a method of forming a pair of bag pads each including a stack of identical flat bottom bags formed from flexible plastic material of film thickness dimensions, in which the bags of each pad are in flattened congruent relation, with each bag including side end seals at either end of and extending longitudinally of the ends of the respective bags, a bottom fold extending between the bag side edges and gusseted for flat bottom shaping when the bag is open, a front panel extending between the bag side ends and lengthwise of the bottom fold thereof, and including a free top edging forming the mouth of the bag, a back panel extending between the bag side ends and lengthwise of the bottom fold thereof, and including a back panel flange projecting a predetermined distance outwardly of the bag mouth to define an edging paralleling the bag bottom fold, with said bags of each pad being heat sealed together in said flattened congruent relation along the back panel edging of the respective bags,

• the method of forming the bag pads from a length of flattened plastic film web stock defining a band having a pair of opposed web stock side walls integrally joined by a pair of web stock opposite side edgings that are spaced apart transversely of the web stock, with the web stock side edgings being formed to define a continuous in-fold pleat integrally connecting the web stock side walls together at the web stock side edgings, with said pleats each forming first and second in-fold web stock plies along and within the respective web stock side edgings,
• said method comprising:
• passing the web stock in flattened relation lengthwise thereof, with one side wall of same facing upwardly and the other side wall of same facing downwardly,
• heat sealing together, at and along each of said web stock edgings, said first and second plies and along pairs of spaced pairs of diagonal heat seals that, for each pair of heat seals, diverge in the direction of the respective web stock edgings and that, for each web stock edging, define a series of bag bottom end corners locating the site of a pair of top connected bags to be formed from the web stock along each web stock side edging transversely thereof,
• stamp forming handle forming openings at each such bag site through both walls of the web stock and that are equally spaced to either side of the longitudinal center line of the web stock,
• forming a pair of spaced apart parallel score lines in the exposed portion of the web stock other side wall that are centered on either side of the longitudinal center line of the web stock and lie between the rows of handle forming openings,
• shaping along the longitudinal center line of the web stock across the web stock said one and said other side walls consecutive cutouts of equal size that are each centered on the web stock center line and between the set of the diagonal heat seals that are transversely aligned crosswise of the web stock and thus defining the free front panel top edging and the back panel flange of consecutive sets of bag front and back panels lying on either side of the web stock center line of which the back panels of each set are integrally connected,
• spot heat welding together the web stock side walls at each such bag site along the longitudinal centerline of each bag to be formed at the respective bag sites,
• consecutively heat sealing and cut forming out of the web stock, crosswise of same, in centered alignment with the consecutive cutouts, and the web stock edging diagonal heat seals aligned therewith, transversely of the web stock, a pair of top connected bags that extend transversely of the web stock,
• stacking the thus formed top connected bag pairs in congruent relation to form a stack of such bag pairs and of a predetermined number of such bag pairs, and,
• simultaneously heat seal connecting the stacked bags through the congruently oriented back panel flanges of same and dividing the stacked bag pairs through said heat seal to form the pair of bag pads.