Silkworm larvae protect themselves in cocoons before they become moths, and each cocoon is a continuous silk with a length of 2000-4000 meters. From cocoon to silk, cocoon gathers in hot and humid air. Humidity and cold air will kill larvae, and silk can't be spit out.

Put the cocoon in hot water, it will soften or slowly soften, the dirty surface will fall off, and finally the end of the silk will be exposed. Then put the cocoons in the second tank, and according to the thickness of silk, you can wrap 4- 12 cocoons together. A cocoon can produce 1-3 kilometers of silk, and finally make the silk into clothes.

Extended data

Cocoon is very thin, only 20 to 30 microns, so it is difficult to use a single cocoon. Therefore, when reeling, it is necessary to gather and wrap silk, that is, twist several cocoons together to form a raw silk, and then reel it into clothes.

Silk is a soft, smooth and elastic textile material, which is very suitable for making clothes. But its main components are silk fibroin and sericin. Silk fibroin is equivalent to fiber core, and sericin is wrapped on silk fibroin. Silk fibroin is used in spinning, not sericin which is sticky outside.