초록 ▼

A stand-up plastic bag has a pair of front and rear side walls defining an open bag mouth at upper edges thereof, and a pair of front and rear bottom gusset walls being disposed between the side walls. The walls are composed of a multi-layered film of different, heat-sealable, coextruded thermoplast

A stand-up plastic bag has a pair of front and rear side walls defining an open bag mouth at upper edges thereof, and a pair of front and rear bottom gusset walls being disposed between the side walls. The walls are composed of a multi-layered film of different, heat-sealable, coextruded thermoplastics, such as polyethylene and Nylon. Polyethylene is on the interior surfaces and Nylon is on the exterior surfaces of the walls. The gusset walls have upper portions interconnected together to form a bottom wall extending between the front and rear side walls. The gusset walls also have lower portions joined by heat seals to lower portions of the front and rear side walls at contiguous portions of polyethylene material on their interior surfaces to form a support band which connects to and extends below the bottom wall. The front and rear gusset walls also have opposite longitudinal edges joined together by heat seals at contiguous portions of Nylon material on the exterior surfaces thereof which complete formation of the support band as a continuous self-standing structure that defines with the bottom wall a stand-up base on the bag.

대표청구항 ▼

A stand-up plastic bag, comprising: (a) a pair of front and rear side walls defining an open bag mouth at upper edges thereof; and (b) a pair of front and rear bottom gusset walls being disposed between said side walls; (c) said front and rear side walls and said front and rear bottom gusset walls b

A stand-up plastic bag, comprising: (a) a pair of front and rear side walls defining an open bag mouth at upper edges thereof; and (b) a pair of front and rear bottom gusset walls being disposed between said side walls; (c) said front and rear side walls and said front and rear bottom gusset walls being composed of a multi-layered film of first and second thermoplastic materials, said first material being on interior surfaces of said walls and heat-sealable at a temperature within a first temperature range, said second material being on exterior surfaces of said walls and heat-sealable at a temperature within a second temperature range greater than said first temperature range; (d) said bottom gusset walls having upper portions interconnected together to form a bottom wall extending between said front and rear side walls, said bottom gusset walls having lower portions joined by heat seals made within said first temperature range to lower portions of said front and rear side walls at contiguous portions of said first material on said interior surfaces to form a support band connected to and extending below the periphery of said bottom wall; (e) said front and rear bottom gusset walls also having opposite longitudinal edges joined together by heat seals made within said second temperature range at contigous portions of said second material on said exterior surfaces thereof which complete formation of said support band as a continuous self-standing structure and define with said bottom wall a stand-up base on said bag.