| 摘要 |
PURPOSE:To readily obtain a high quality film with a uniform film thickness and having no any defects such as pin holes or the like by constantly controlling the film material viscosity of a coated film immediately before the coat film is wound. CONSTITUTION:After the dope is coated on a mold release film in a uniform thickness, and in the process wherein the coating material is wound in a state of being kept the fluidity, a coat film is manufactured by spraying a certain constant temperature gas within the range of + or -20 deg.C on a film immediately before being wound. At this time, the dope (coating material) as a film material has a degree of the viscosity or higher that it may not flow as coated on the film, and as the viscosity of the dope is so high, it becomes hard to spread over the whole of the film. On the contrary, the viscosity of the dope is very low, it becomes hard to mold a film. That is, it is necessary for the dope to have a degree of viscosity capable of being coated on the film uniformly, and it may be suitable for it in 1000-30000cp in ordinary, and preferably in 2000-20000cp. |
