BIAXIALLY ORIENTED NYLON FILM, LAMINATE WRAPPING MATERIAL, PROCESS FOR PRODUCTION OF BIAXIALLY ORIENTED NYLON FILM AND PROCESS FOR PRODUCTION OF LAMINATE WRAPPING MATERIAL

摘要

Biaxially-oriented nylon film according to the present invention is biaxially-oriented nylon film made from nylon (6). In the biaxially-oriented nylon film, an elongation ratio of the film in each of four directions (an MD direction, a TD direction, a 45 degree direction and a 135 degree direction) until a film rupture is 70 percent or more, the elongation ratio being measured in a tensile test (testing conditions: a sample width is 15mm; a distance between gauge points is 50mm; and a tensile speed is 100mm/min), and a stress ratio A (à 1 /à 2 ) between a tensile stress à 1 and a tensile stress à 2 in a stress-strain curve obtained in the tensile test of the film is 2 or more in each of the four directions, the tensile stress à 1 being a value at a point where the elongation ratio becomes 50 percent while the tensile stress à 2 being a value at an yield point.