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SILK YARN TO PROCESS |
1. Harvesting the Cocoons
- Cocoon Selection: Select cocoons with the highest quality for optimal yarn. Silkworm cocoons are typically harvested about a week after they are spun.
- Sorting: Sort cocoons by quality, size, and color to ensure uniformity in the final yarn.
2. Stifling
- Stifling is the process of killing the pupae inside the cocoon by exposing them to high temperatures. This prevents the moth from emerging and breaking the filament.
- This can be done by steaming or hot air. The goal is to retain the integrity of the cocoon structure for reeling.
3. Boiling the Cocoons
- Soak the cocoons in hot water to soften the sericin, the gummy substance that binds the silk fibers. Boiling helps to unwind the silk more smoothly.
4. Reeling the Silk
- The reeling process involves unwinding the silk filaments from the cocoon.
- Workers or machinery find the filament end and reel it onto spools. Multiple filaments are often combined to create a single, stronger strand.
- This raw silk filament, called reeled silk, is the basis for silk yarn.
5. Throwing (Twisting the Silk)
- The process of throwing involves twisting multiple silk filaments together to create threads and yarn of desired thickness and strength.
- Depending on the end use, different twists (tight or loose) are applied.
6. Degumming
- Degumming removes any remaining sericin, enhancing the silk’s softness and sheen.
- Silk is soaked in warm, soapy water, then rinsed and dried. This step brings out silk's characteristic smoothness and shine.
7. Dyeing (Optional)
- Silk yarn can be dyed in a variety of colors. Because silk absorbs dye well, it is often dyed after degumming.
- Silk dyeing requires specialized dyes and gentle handling to maintain the silk's integrity and luster.
8. Finishing
- The yarn is wound onto bobbins or hanks, ready for weaving, knitting, or other textile processes.
Each of these steps requires precision, as silk is a delicate material.
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