Patent ID: 7497624
Filing Date: 2009-03-03
Classification: B31B,B65D

Abstract:
1. A plastic bag comprising two superposed layers of panels having opposite edges, and a pair of side gussets extending along the opposite side edges of panels, each of the side gussets being folded into halves and interposed between the layers of panels to have a folded inner edge, open outer edges and opposite end edges, each of the side gussets having opposite end portions one of which is folded obliquely along a folding line as it is folded into halves so that a triangular flap can be formed by the end portion to be shaped into a triangle having a base formed by the folding line, the triangle having an apex formed by an intersection between one of the opposite end edges and the folded inner edge of each of the side gussets, the panels, the side gussets and the triangular flaps being heat sealed respectively along the opposite side edges of panels, each of the panels and the side gussets comprising a laminated plastic film composed of a base material and a sealant which is laminated on the base material, the layers of panels having inner surfaces formed by the sealant and outer surfaces formed by the base material, each of the side gussets having outer surfaces formed by the sealant and inner surfaces formed by the base material when being folded into halves, the triangular flaps having outer surfaces formed by the sealant and inner surfaces formed by the base material, the panels and the side gussets being heat sealed with each other by the sealant along the opposite side edges of panels so that heat sealed portions can be formed along the opposite side edges of panels, the triangular flaps having open sides extending along the opposite side edges of panels positioned in the heat sealed portions, each triangular flap being heat sealed with one of the layers of panels by the sealant along the opposite side edges of panels, while the triangular flaps are heat sealed with the side gussets by the sealant.