Twisting is the process of reeling the bundles of yarn to skein lacing. It can be achieved by winding two strands of silk into multiple threads. These multiple spools are again used to prepare the warp. The end of the raw silk is tied with cotton thread, which helps to find the silk thread end easily during the preparation process for weaving.

For more details:
https://dsource.in/resource/silk-twisting-process