| 摘要 |
[Problem] To provide a laminated biaxially-oriented polyamide film and packaging bag having an inorganic thin-film layer suitable as a packaging material or the like for food products, medical products, chemical agents, and the like for which a variety of gas barrier properties are required, such film and packaging bag offering: superior bag breakage resistance, impact resistance, and flexural fatigue resistance, and especially flexural fatigue resistance in low-temperature environments; superior effects of prevention of bag breakage or the like during transportation or storage of goods when used as a packaging material for food packaging or the like; and both high heat seal strength and favorable outer appearance, even when automatically filled at high speed with a liquid soup, seasoning, or the like. [Solution] A gas barrier laminated film in which an inorganic thin-film layer is laminated onto one side or both sides of a base film, the gas barrier laminated film being characterized by satisfying the following conditions (1) to (4): (1) The heat shrinkage factor in the longitudinal direction, with ten minutes of retention under dry heat at 160°C, is 1.5 to 4.0%; (2) The heat shrinkage factor in the lateral direction is 2.1 to 4.5%; (3) The film thickness is less than 9 μm; and (4) The elastic modulus is 2.2 GPa or below. |
