| 摘要 |
PROBLEM TO BE SOLVED: To provide a film roll manufactured without needing any high-level temperature control and capable of preventing wrinkles or slackening on a film when the film taken up on the roll is rolled out to be used, the thickness of the film in a width direction being uniform.SOLUTION: The film roll manufactured by taking up a film on a winding core is characterized in that roll circumferential lengths D1 to D14 at respective portions when the film roll is equally divided into 14 in a width direction satisfy an equation (1) below, and a maximum thickness difference (Tm) among film thicknesses T1 to T14 of the respective portions measured on a straight line in the width direction of the film roll divided into 14 is equal to or less than 1.2% of the average value (Ta) of the film widths T1 to T14.SELECTED DRAWING: Figure 1 |
