公开(公告)号：US20230039765A1

公开(公告)日：2023-02-09

申请号：US17762912

申请日：2020-09-25

Applicant: Spiber Inc.

Inventor： Hideto Ishii ,  Mizuki Igarashi ,  Tatsuki Adachi ,  Yunosuke Abe

IPC: C07K14/435 ,  D02J1/22 ,  D01F4/02 ,  D01D5/06

Abstract: An object of the present invention is to provide a method capable of producing a protein fiber in which shrinkage at the time of first contact with moisture after production is more reliably suppressed and generation of crimp is also suppressed. A method for producing a protein fiber according to the present invention includes: a pre-shrinking step of shrinking a protein fibril in a relaxed state after drawing and before being wound; a winding step of winding the protein fibril subjected to the pre-shrinking step to obtain a wound product; and a post-shrinking step of shrinking the protein fibril subjected to the winding step in a relaxed state.