| abstract |
It provides a natural organic fine powder content. The ultrafine powder of silk fibroin as a fine powder in the natural organic fine powder content of the present invention is a first step of grinding silk fibroin into coarse powder by dry mechanical grinding means, and the coarse powder of silk fibroin by dry mechanical grinding means. A second step of grinding into fine powder, a third step of grinding the fine fibroin fine powder into an ultra fine powder having an average particle size of 10 μm or less by dry mechanical grinding means, and at least one of the first to third steps or Then, it manufactures by β-processing about silk fibroin powder. Specific examples of the inclusions include films, sheets, paints, and fiber treatment agents. |