| 摘要 |
PROBLEM TO BE SOLVED: To provide a multilayer film that can sufficiently suppress spring back in cold molding and has excellent deep drawing moldability at the time of cold molding.SOLUTION: The multilayer film includes a nylon layer comprising an oriented nylon film, an aluminum layer, and a polyvinyl chloride layer, in this order. 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, an elastic modulus is 1000 MPa or more and 2000 MPa or less in all of the four directions; a tensile stress &sgr;at a proportional limit is 30 MPa or more and 55 MPa or less in all of the four directions; and a stress ratio A (&sgr;/&sgr;), which is a ratio of a tensile stress &sgr;when a strain &egr;is 0.5 to the tensile stress &sgr;at the proportional limit, is 1.5 or more and 2.5 or less in all of the four directions. |
