| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation foreign matters and the deterioration of a core body and to have a good appearance without swelling, etc., in a method in which the solution of a polyimide precursor is applied uniformly on the peripheral surface of the core body, and the film is heated to make a tube. SOLUTION: In a method for making a polyimide tube including a process in which the solution of a polyimide precursor is applied on the peripheral surface of a core body 1, and after the core body being heated until the film 4 has at least strength as a tube, the tube is removed from the core body 1, (A) the core body 1 having a form in which a projection spreading smoothly from the peripheral surface to the bottom part of a cylinder is formed, and a recession 3 is formed in the middle part of the projection, or (B) the core body 1 having a form in which the bottom part of the cylinder is flat or recessed, and a sharp edge is formed from the peripheral surface to the bottom part of the cylinder is used, and after the peripheral surface of the core body 1 is coated with the solution of a polyimide precursor, the core body 1 is heated while being supported at its upper end part. |
