High shrinkage artificial fibroin spun yarn and its manufacturing method, and artificial fibroin spun yarn and its shrinkage method

摘要

The present invention relates to a contracted artificial fibroin spun yarn containing modified fibroin, which is a highly contracted artificial fibroin spun yarn having a shrinkage rate of more than 1% as defined by the following formula I. Shrinkage rate = {1- (length of contracted artificial fibroin spun yarn / length of artificial fibroin spun yarn after spinning and before contact with water)} x 100 (%) ... (Formula I)