The natural fiber contained in silk is mainly silk fiber, which is a continuous long fiber formed by the coagulation of the silk liquid secreted by the cocoon of the cooked silkworm. It is also called natural silk. It is one of the earliest animal fibers used by humans, including mulberry silk and tussah silk. , Castor bean silk, cassava silk, etc.
Silk fiber is the only natural filament fiber that has been put into practical use. It is made from the coagulation of silkworm slime. Silk fibers are divided into many types due to the different feeding habits of silkworms. Among them, there are mulberry silk fibers formed by eating mulberry leaves, tussah silk fibers formed by eating tussah leaves, and other wild silk fibers formed by eating cassava leaves, mulberry leaves, and castor leaves. Mulberry silk fiber and tussah silk fiber can retain the shape of filament fiber in the filament yarn formed by clustering, and other wild silk fibers can only be transformed into short fibers for textile processing. Among the filament yarns formed by bundling of mulberry silk fibers and tussah silk fibers, the filament yarns of mulberry silk fibers are the most important and account for most of the natural filament yarns.
