Silkworms spit out two silks at the same time, but after solidification, they will merge to form a cocoon silk. The section of the cocoon silk is similar to glasses. Each cocoon silk contains two silk fibers bonded together by sericin, called silk fibroin, that is, non-glue silk fibers. It has a cross-sectional characteristic close to a triangle, but the shape and cross-sectional area are not uniform.
Silk fibroin is also called silk fibroin, which is the silk fiber that is finally used.
Sericin wraps around the silk fibroin fiber, and its presence will have an important impact on the use, processing and product style of the fiber.
The content of sericin on each cocoon silk is not uniform. The silk that is spit out at the beginning has a low sericin content, and the silk that is spit out at the end has the highest sericin content. Silk fiber has a relatively complete fibril structure, which can fully express the excellent quality of natural fiber.
