Like other countries of the world, Bangladesh also cultivates silk. Apart from Bangladesh, it is cultivated in different countries. Yarn is obtained from silkworm which is used to make silk cloth.
Bombyx mori is a kind of fine and soft fiber woven from yarn made from silkworm cocoons. Silk yarn is the main source of silk thread. Four types of silk have been produced in Bengal for a long time: Mulberry, Andy, Muga and Tassar. The first is made from a cocoon of the genus Bombyx, which eats the leaves of the mulberry or mulberry tree; The second is made from silkworms of the genus Philosemia who eat the leaves of the castor tree; The third is from the Antheria Asmensin silkworm, which eats cool, bay leaves and camphor leaves, and the fourth is from the Antheria silkworm, which eats oak leaves. Mulberry silk is generally considered to be the most valuable. The silkworm is very beautiful to look at.
The silkworm or cocoon looks a lot like a pigeon's egg. The yarn of the cocoon is disjointed, but a single yarn of more than 500 m in diameter is concentricly arranged. Cocoon takes three days to make. Differences in the shape and color of the cocoon are observed. Within 7 days, the larvae turn into pupae inside the cocoon. Before turning into a pupa, the cocoon has to be boiled in hot water to kill the insect inside. Silk yarn is collected from this cocoon. If the full pupa turns into a moth and the edges of the cocoon burst out, the continuity of the yarn is broken and the quality of the silk yarn is reduced. A reel is made by joining the yarns inside 2 to 6 cocoons. Span silk is made by twisting the outer discarded yarns which is used to make matka silk.