DIE, SOLUTION FILM FORMING METHOD, AND MOLTEN FILM FORMING METHOD

• Main Author: HAMACHI YOHEI
• Format: Patent
• Language: English; Japanese
• Published: 10.11.2016
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; APPARATUS FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SPRAYING OR ATOMISING IN GENERAL; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROBLEM TO BE SOLVED: To provide a die, a solution film forming method, and a molten film forming method which suppress the occurrence of a local thin film portion in a center part of film.SOLUTION: An internal flow channel 49 of a die 20 comprises a first flow channel portion 51, a second flow channel portion 52, and a third flow channel portion 53 directed toward an outlet port 49o from which a dope 18 is discharged. The first flow channel portion 51 has a second length in an X direction formed in a gradually increasing manner toward the outlet port 49o to form a dope flow in a shape of wide film. The second flow channel portion 52 has a first length in a Y direction formed in a gradually decreasing manner toward the outlet port 49o to decrease the thickness of the film-shaped dope flow. The third flow channel portion 53 regulates the flow rate distribution in the width direction by a choke bar 56 while guiding the dope flow. In a center part of the choke bar 56 in the X direction is formed a groove 60 along the flow direction of the dope 18, the width W60 of the groove 60 being predetermined to be in a range of 1 mm or more and 20 mm or less.SELECTED DRAWING: Figure 3 【課題】幅方向中央部に局所的な薄膜部分がフィルムに発生することを抑制するダイ、溶液製膜方法及び溶融製膜方法を提供することを目的とする。【解決手段】ダイ２０の内部流路４９は、ドープ１８を出す出口４９ｏに向けて、第１流路部５１，第２流路部５２，第３流路部５３を備える。第１流路部５１は、Ｘ方向での第２長さが出口４９ｏに向けて漸増して形成され、ドープ流を幅広の膜状に形成する。第２流路部５２は、Ｙ方向での第１長さが出口４９ｏに向けて漸減して形成され、膜状のドープ流の厚みを減少させる。第３流路部５３は、ドープ流を案内しながらチョークバー５６により、幅方向における流量分布を調節する。チョークバー５６のＸ方向中央部には、ドープ１８の流れ方向に沿った溝６０が形成されており、溝６０の幅Ｗ６０は１ｍｍ以上２０ｍｍ以下の範囲内とされる。【選択図】図３