Question

why are some cocoons not boiled during harvesting of the silk thread

Answer 1

Hey mate! Here is your answer:-
Some cocoons are not boiled during the harvesting of silk thread because they are let to grow into pupae. This pupae will then help in the future harvesting of silk when they grow into a moth.
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Answer 2

Answer:It must be kept in mind that about 1 per cent of total harvest of cocoons is not boiled. The insects within the cocoon are allowed to mature to form silk moths. These silk moths cut through the cocoons and are allowed to breed for silk worm eggs for future production of silk. The silk from the damaged cocoons is collected and mixed with the filaments of coarse outer portion of the cocoon as well as from the inner portions of cocoons which is left after reeling. This mixture is then spun to obtain low grade silk yarn.

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