| 摘要 |
PURPOSE:To prevent a film from contracting and improve the sealability by adding a process in which a film is stretched by a contraction preventive roller of which film feeding speed is faster than a heater roller, and a process in which the stretched film is cooled by cooling air, after a sealing process. CONSTITUTION:Since the film feeding speed of a contraction preventive roller 4 is faster than that of a drive-rotating heater roller 2, a film between the two parts is stretched, and contraction is prevented from happening. Therefore, on the sealing surface of the heater roller 2, lateral sealing which increases the sealability can be applied. In the next process, cooling air 6 is blown, and the sealed part is fixed under a condition in which contraction of the film is prevented from happening. |
