| 摘要 |
PURPOSE:To prevent generation of a scratch in the direction of width of a film by preventing generation of neck-in, by a method wherein after stretching of a running film between rolls in a longitudinal direction, both side end parts of the film are cooled while fitting them into a fitting part formed in a circumferential direction of both end parts of a cooling roll. CONSTITUTION:When a stretching roll 1 is turned at a peripheral speed slower than that of a stretching and cooling roll 2 and a film 3 is sent into them, the film 3 is stretched longitudinally between the stretching roll 1 and stretching and cooling roll 2. The film 3 is sent to a cooling roll 5 after it is cooled a little by the stretching and cooling roll 2 and cooled while the film is being energized in the direction of the center of the cooling roll 5. Then both the side end parts of the film 3 are solidified gradually under a state where they are entered into a fitting part 6. Therefore, though the film 3 is apt to shrink in the direction of a width by thermal shrinkage due to cooling and lateral distortion due to tensile force of a longitudinal direction, this is prevented by fitting of both the side end parts into the fitting groove 6. With this construction, generation of a scratch of the width direction can be prevented without generating neck-in in the film. |
