| 摘要 |
PURPOSE:To enable to fold the titled film at high rate without generating creases, sagging and fold, by a method wherein a space between openings is surrounded substantially by a circumferential wall and the circumferential wall is provided with a heating device heating bubbles passing through the circumferential wall. CONSTITUTION:As for a guide 11, the top of the same possesses a slitlike opening part 12 guiding bubbles 2 to an abutting part 5a of nip rolls 5 and the lower end of the same on a die side is provided with an opening part 13 in a circular or oval shape introducing the bubble 2. An intermediate part of a circumferential wall is of a shape of an ellips wherein a major axis of the same becomes long gradually in a lengthwise direction of the nip rolls 5 according as the intermediate part approaches the nip rolls 5. The guide 11 is fitted with a heater 17 heating the bubbles 2 from the room temperature and keeping using resin at an arbitrary temperature. When the bubbles 2 are passed through the guide 11 constituted in this manner and led to the nip rolls by keeping the guide 11 at the predetermined temperature by the heater 17, a flat film which does not have creases, sagging and fold can be obtained highly efficiently even in a high-tension modulus film. |
