PROBLEM TO BE SOLVED: To provide a method of producing a collagen fiber having sufficient mechanical strength.SOLUTION: A method of producing a collagen fiber comprises forming a filamentous collagen by discharging a collagen solution into a coagulation bath through air gaps in a filamentous form so as to cause the collagen solution to undergo elongation flowing immediately before spinning and removing the solvent of the solution. More specifically, the method of producing a collagen fiber comprises solubilizing collagen, preparing a high-concentration collagen solution rich in monomer collagen from the solubilized collagen and discharging the high-concentration collagen solution of a concentration of 10 mass% or higher into the coagulation bath through the air gaps in a filamentous form.COPYRIGHT: (C)2016,JPO&INPIT【課題】十分な力学的強度を有するコラーゲン繊維を製造する製造方法を提供する。【解決手段】コラーゲン溶液をエアギャップを通して凝固浴中に糸状に吐出させることによって、コラーゲン溶液を紡糸直前に伸張流動させて糸状コラーゲンを作製し、溶液溶媒を除去してコラーゲン繊維を製造する方法。コラーゲンを可溶化し、この可溶化コラーゲンからモノマーコラーゲンに富む高濃度コラーゲン溶液を調製し、10質量%以上の高濃度コラーゲン溶液をエアギャップを通して凝固浴中に糸状に吐出させるコラーゲン繊維の製造方法。【選択図】図3
