Rectangular and flat bottom bag and method of manufacture
OwnerGary G. Plateinventor
Life of this patent
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Abstract
A method of manufacturing a novel rectangular, flat-bottomed bag from a sheet of thermoplastic material in which the sheet is folded, a gusset formed at the fold line and a portion of the gusset turned upon an adjacent bag wall to form an outer planar bottom wall and side gusset. The formed sheet is then heat sealed by one or two operations at the planar bottom wall to form an X-weld across the bottom wall, triangular portions of the bottom wall defined by the X-weld severed and removed, and the sheet transversely welded and severed along a line intersecting the center of the X-weld.
Claims4
A method of manufacturing a rectangular, flat bottom bag from heat sealable plastics sheet material which comprises:
- folding said sheet material longitudinally to define a pair of opposed side walls about a fold line, forming a gusset along said fold line having a pair of opposed gusset folds, turning one of said gusset folds upon an adjacent side wall whereby said gusset folds together form an outer planar bottom panel and an inner gusset fold opposed to the adjacent side wall defining an inner fold line, separating the inner gusset fold from the adjacent side wall and transversely heat sealing the sheet material forming the planar bottom panel by an X-weld at an acute angle to the inner fold line of the sheet material, whereby the centre of the X-weld intersects the said inner fold line, severing and removing from said sheet material lateral triangular corner portions defined by said X-weld, and transversely welding and severing said stock material along a line intersecting the centre of said X-weld.
Dependencies are inferred from the claim text.