Method and device for manufacturing protein fiber

1. A method for manufacturing a protein fiber, comprising:

an extension and contraction step of contracting or extending a protein raw fiber containing a protein by bringing the protein raw fiber into contact with a liquid or vapor; and

a drying step of drying the protein raw fiber that has undergone the extension and contraction step while adjusting a length of the protein raw fiber to an arbitrary length.

2. The method for manufacturing a protein fiber according to claim 1 , wherein the extension and contraction step is a step of naturally contracting the protein raw fiber by bringing the protein raw fiber into contact with the liquid or vapor.

3. The method for manufacturing a protein fiber according to claim 2 , wherein the extension and contraction step is performed in a state where the protein raw fiber is not loosened.

4. The method for manufacturing a protein fiber according to claim 3 , wherein, in the extension and contraction step, the protein raw fiber is tensioned such that a contraction amount of the protein raw fiber is substantially the same as a contraction amount of the protein raw fiber in a case where the protein raw fiber is naturally contracted by being brought into contact with the liquid or vapor in a state where the protein raw fiber is loosened.

5. The method for manufacturing a protein fiber according to claim 1 , wherein the protein is a structural protein.

6. The method for manufacturing a protein fiber according to claim 5 , wherein the structural protein is a spider silk fibroin.

7. The method for manufacturing a protein fiber according to claim 1 , wherein the liquid is a warmed liquid.

8. The method for manufacturing a protein fiber according to claim 1 , wherein the extension and contraction step is performed by immersing the protein raw fiber in the liquid.

9. The method for manufacturing a protein fiber according to claim 1 , wherein the liquid or vapor has a polarity.

10. The method for manufacturing a protein fiber according to claim 9 , wherein the liquid is water or hot water, and the vapor is water vapor.

11. The method for manufacturing a protein fiber according to claim 1 ,

wherein the extension and contraction step and the drying step are performed with respect to the protein raw fiber fed continuously,

the method further comprising a step of continuously winding a protein fiber obtained through the extension and contraction step and the drying step.

12. The method for manufacturing a protein fiber according to claim 11 , wherein a speed at which the protein fiber is wound is slower than a speed at which the protein raw fiber is fed, and is a speed at which the protein raw fiber is not loosened in the extension and contraction step.

13. A method for manufacturing fabric made of protein fibers, comprising a step of producing fabric using the protein fiber manufactured by the manufacturing method according to claim 1 .

14. A method for processing a protein fiber, comprising:

an extension and contraction step of contracting or extending a protein raw fiber containing a protein by bringing the protein raw fiber into contact with a liquid or vapor; and

a drying step of drying the protein raw fiber that has undergone the extension and contraction step while adjusting a length of the protein raw fiber to an arbitrary length.

15. The method for processing a protein fiber according to claim 14 , wherein the extension and contraction step is a step of naturally contracting a length of the protein raw fiber by bringing the protein raw fiber into contact with the liquid or vapor.

16. A device for manufacturing a protein fiber, comprising:

extension and contraction means for contracting or extending a protein raw fiber containing a protein by bringing the protein raw fiber into contact with a liquid or vapor that contracts or extends the protein raw fiber upon contact with the protein raw fiber;

drying means for drying the protein raw fiber contracted or extended by the extension and contraction means; and

adjustment means for adjusting a length of the protein raw fiber to an arbitrary length during drying of the protein raw fiber by the drying means.

17. The device for manufacturing a protein fiber according to claim 16 , wherein the extension and contraction means is configured to naturally contract the protein raw fiber by bringing the protein raw fiber into contact with the liquid or vapor.

18. The device for manufacturing a protein fiber according to claim 17 , further comprising tensioning means for tensioning the protein raw fiber such that the contraction of the protein raw fiber by the extension and contraction means is performed in a state where the protein raw fiber is not loosened.