Patent ID: 8616768

Claim:
A method of manufacturing pleated stand-up packaging bodies, the method comprising: intermittently or continuously conveying a feed roll of a packaging material comprising at least one surface having a heat seal property and pleats formed on a surface opposite to the surface having the heat seal property by folding the packaging material in a three-ply strip form in the orthogonal direction to the direction in which the feed roll is fed, wherein a pleat is spaced a predetermined distance from where the feed roll is cut off to form a bottom face portion of each of the packaging bodies and has a cut-off portion at a portion where the pleat and a rib form an inclined cross-portion, and wherein the cut-off portion has a width that is at least twice as wide as the width of the rib such that when the rib is inclined the pleat has been cut out at least under the inclined rib at the cross portion; forming a packaging tube by heat sealing both end edges of the feed roll to be tubular with the rib in a pinched form in a former; intermittently or continuously conveying the packaging tube; feeding products to be packaged by a conveyor into the packaging tube formed inside the former between the pleats; double heat sealing the packaging tube downstream of the former at a position between the products; and cutting the packaging tube at a position between the double heat seals.