| abstract |
As a film roll formed by winding a PVA film, the length of the PVA film is 3,000 to 20,000 m, and the PVA film has a cut end formed by cutting at least one of two ends along the length direction of the film with a cutting blade. , The development area ratio Sdr of the cut surface at the cut end satisfies the following formula (1), and the spread area ratio Sdr(s) of the cut surface at the start of winding of the PVA film and the cut surface at the end of winding of the PVA film It is characterized in that the development area ratio Sdr(e) of satisfies the following formula (2). Thereby, in the case of manufacturing a film roll formed by winding up a long PVA film of 3,000 m or more, a film roll capable of preventing the film from breaking occurring during stretching is provided. Sdr ≤ 0.085 (1) 0.10 ≤ Sdr(s)/Sdr(e) ≤ 1.00 (2) |