| 摘要 |
PROBLEM TO BE SOLVED: To provide a multilayer film that can be favorably drawn without inducing damages such as pinholes or cracks in an aluminum layer.SOLUTION: The multilayer film includes a nylon layer comprising an oriented nylon film and an aluminum layer laminated thereon, in which a thickness ratio D (d1/d2), which is a ratio of a thickness d1 of the nylon layer to a thickness d2 of the aluminum layer, is 0.25 or more and 0.8 or less. In stress-strain curves in four directions (an MD direction, a TD direction, and directions at angles of 45° and 135° of the oriented nylon film) obtained by tension tests on the multilayer film (under the conditions of 15 mm sample width, 50 mm gauge length, and 100 mm/min tensile speed), a stress ratio A (&sgr;/&sgr;), which is a ratio of a tensile stress &sgr;when a strain &egr;is 0.5 at breaking in the four directions to a tensile stress &sgr;at the proportional limit, is 2.5 or more in all of the four directions. |
