| 摘要 |
A stand-up bag (10) having a pair of front (12) and rear (14) side walls defining an open bag mouth (20) at upper edges (12A, B) thereof, and a pair of front and rear bottom gusset walls (16, 18) disposed between the said walls. The walls are composed of a multi-layered film of different, heat-sealable, coextruded thermoplastic materials, such as polyethylene and Nylon. Polyethylene may be used for the interior wall and Nylon may be used for the exterior walls of the bag. The gusset walls have upper portions (22, 26) interconnected together to form a bottom wall (60) extending between the front and rear side walls. The gusset walls also have lower portions (24, 28) joined by heat seals to lower portions (34, 36) of the front and rear side walls (12, 14) at contiguous portions of material on their interior surfaces to form a support band (56) which connects to and extends below the bottom wall (60). The front and rear gusset walls (16, 18) also have opposite longitudinal edges (16A, 18A) joined together by heat seals at contiguous portions of material on the exterior surfaces (44, 46) thereof which complete formation of the support band (56) as a continuous self-standing structure that defines with the bottom wall a stand-up base on the bag. |
