| 摘要 |
PROBLEM TO BE SOLVED: To improve the handling property by providing unevenness whose mean roughness is not less than a specified value on the surface of a film to eliminate entanglement between films without damaging the excellent flexibility and adhesivity. SOLUTION: Unevenness is provided on a surface of a film. The uneven pattern is not limited, and the uneven pattern at random or specified intervals is acceptable. The degree of unevenness (roughness) is approximately not less than 40 nm, preferably approximately, 40 nm to 1 mm, especially preferably, approximately 200 nm to 1 mm in mean roughness (Ra value) measured by using a stylus type surface roughness needle under the condition of approximately 5μm of stylus size and approximately 50 mg in stylus pressure. In a non- extended condition, the film surface is uneven, the adhesivity is not present between films, and the films are not entangled with each other, and the handling property is excellent. During the wrapping, the film is expanded, its unevenness is not present, and the adhesivity and flexibility specific to the film are restored.
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