| Bamboo textiles have become increasingly popular across the European and American markets, especially in the home textile segment |
Bamboo yarn is spun by natural fibers made from the pulp of bamboo plants. It retains many of the properties it has as a plant. While bamboo is highly water absorbent, bamboo fiber demonstrates good wicking ability, pulling moisture away from the skin and allowing it to evaporate.
Bamboo yarn also possesses marked antibacterial qualities, reducing the source that causes human odors. Meanwhile, it keeps the wearer cooler in summer and warmer in winter, and blocks ultraviolet rays. In addition to being easy to dye, this cellulose fiber provides good handle and drapability.
Q: What are the major processes of spinning bamboo yarns?
A: To reduce the damage made on the yarns and improve the yarn quality for subsequent processes, a short spinning process for bamboo yarns is recommended. It involves such procedures as feeding, mixing and blowing, carding, drawing, spinning and winding.
Q: How is pure bamboo yarn spun?
A: Take the spinning of pure bamboo yarn of 14.8tex as an example. It is important to wet bamboo materials before treatment. Bamboo fibers absorb and release moisture faster than other cellulose fibers under the same conditions, so the fibers should be kept wet and then left for six to eight hours before feeding, keeping the fibers wet in subsequent processes.
The fine bamboo fibers have a uniform length and without impurity. In the opening and cleaning process, a relatively low beating speed is recommended to minimize damage on fiber.
In the process of carding, carding space can be controlled at a relatively low level, while carding moisture controlled at a high range. Relative humidity is generally kept at 70%, while the pressure on compression roller is lowered.
For improved evenness, a larger back draft multiple is adopted in the early drawing, followed by a more concentrated draft in the later phase of drawing.
The weakly cohered bamboo fibers may generate hairiness and lead to unwanted draft, so the coefficient of twist of rover is often controlled at a low level. A level of 65% humidity in workshop is suggested for drawing and roving.
Q : How to avoid hairiness in bamboo yarn spinning?
A : Spinning is the final stage of yarn making, and quality of yarns is associated with the use and arrangement of quality machinery and accessories, including the spinning frame, spin-ring and twister.
Indicators of bamboo and other cellulose fibers. |
A modern automatic winding machine from Murata or other suppliers is equipped with a monitoring devise to maintain a stable air ring during unwinding, reducing hairiness in the process of bobbining. A winding machine is also adopted to exert a uniform level of tension in the procedure and the yarn density will be consistent. The use of yarn steaming treatment before winding can reduce half of hairiness, further enhancing the natural shiny appearance of bamboo yarn.
Additionally, a large coefficient of twist, and a low level of running speed and tension are adopted to avoid hairiness.
Q: Can you give some tips in bamboo yarn producing process?
A: Bamboo yarn producing is similar to viscose producing.
As bamboo fiber tends producing hairiness in drawing and roving, a high humidity in workshop is recommended. If bamboo fiber is too dry before feeding, a vapor pre-treatment helps enhance the processing.
The information is provided by Huayuan Textile Co Ltd.
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