Silkworms live for only two or three days after laying eggs. About 36,000 to 50,000 eggs are laid, and these are carefully stored at the silkworms farm until they are already to hatch. The eggs hatch into catepillars, which feed on mulberry leaves. Soon, the catepillars are ready to spin their cocoons. Not all catepillars can spin sil cocoons. Only the catepillars of a liquid produced later hardens to form fine strands. The catepillar makes its coons using these strands. The threads on the outsideof cocoon are rough, while those inside are soft and smooth.
Some fully-spun cocoons are heated. This kill the pupa inside. The cocoons are then put into hot water to loosen the fine threads. Finally, these thread are reeled off the cocoons.
The length of unbroken thread produced by single cocoon measures about on-and-a-half kilometers. Being together of these threads make single woven materials.
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