| 摘要 |
PURPOSE:To obtain a bag material having excellent resistance against the piercing caused by a sharp edge and the cutting-in of an edge tool by laminating a synthetic resin polymer film or sheet having an m.p. lower than that of a specific synthetic resin polymer stretched material to the crosswise laminate of said stretched material. CONSTITUTION:A synthetic resin polymer stretched material has tensile strength of 20g/denier or more, pref., 30g/denier or more and a cross-sectional area of 0.1mm<2> or more and a certain number of the stretched materials are laminated so as to cross each other at a right angle or at a predetermined angle to constitute a crosswise laminate (piercing-resistant layer). To both surfaces of the crosswise laminate of said synthetic resin polymer stretched material or to the single surface thereof, a synthetic resin polymer film or sheet having an m.p. lower by 5 deg.C or more than that of said synthetic resin polymer stretched material is applied and all of them are integrated using a heating pressure molding means. As the synthetic resin polymer, a polyethylene, an ethylene/vinyl acetate copolymer and an ethylene/ethyl acrylate copolymer can be designated. By using these materials, a bag material having good release resistance can be obtained. |
