Why is cocoon that produces a live sulk motherless for making sulk cloth?

The cocoon that produces the live silk, specifically from the silkworm (Bombyx mori), is considered "motherless" because it is typically harvested before the moth emerges. This process prevents the moth from breaking free, which would damage the silk fibers. By keeping the cocoon intact, the silk strands can be unraveled in long, continuous lengths, resulting in higher quality silk cloth. This method is essential for maintaining the integrity and value of the silk produced.