The process for breeding silkworms (can), specifically the Bombyx mori belonging to the family Lopidoptera (jiacan). Living on mulberry (sang) leaves, the silkworm has four growth stages in its life cycle: egg (luan), caterpillar (yiuchong), chrysalis or pupa (yong) and moth (e). The silkworm produces silk to enclose itself in a cocoon (jian) at the chryalis (pupa) stage.
Raw silk (shengsi) is the product of silk reeling, including single filament (dansi), and grege, which is comprised of a few filaments. Short lengths of discontinuous filaments from either damaged cocoons or remains of reeled cocoons are used to produce spun silk (juansi).
3. 1Silk thread
Silk filaments become the thread or yarn by the application of one or more the following procedures:
1. twist (jianian), the direction is indicated by the letter "S" or "Z", the degree of tightness of the twist is indicated by the number of turns in a given unit of length.
2. double (bingsi), ends of silk filaments are put together without any twisting, into silk floss (rongsi), usually used for in the weft when weaving and as embroidery thread.
3. ply (hegu), twisting threads of silk together to create a thicker thread, indicated by n-Z(S)ply.