In recent years, due to the unique characteristics of absorbent, breathable, antibacterial and anti-ultraviolet rays of hemp fiber, hemp fabrics are favored by consumers. However, everything cannot be perfect. Hemp fiber is also hard due to its poor elasticity. It is prone to wrinkles, itching and other problems during wearing. At the same time, because of its low fiber count, it is not easy to spin high-thin fabrics. In addition, the molecular structure of hemp fiber is tight, which results in poor dyeability of the product, resulting in dull color, etc. These problems have become a “bottleneck†that restricts the quality of hemp fabrics.
Recently, as the refined hemp fiber processing technology passes the expert appraisal organized by Zhejiang Science and Technology Department, some “fatal†issues of the above-mentioned hemp fabrics will be effectively solved. So, what kind of technology is fine fiber processing technology?
Achievable results
Without destroying various excellent properties of hemp fiber, this technology can improve the fineness of the hemp fiber, make it more flexible, and can spin the high hemp yarn and improve the softness of the hemp fabric, effectively solving the problem of itching. In this way, the requirement of using hemp yarn as a knitted fabric to make the undergarment can be satisfied, which greatly expands the use of hemp fabric.
Tests show that the performance of hemp fiber has been greatly improved after refinement. The fineness of ramie fiber has been improved by nearly 10%, and the strength has been slightly improved; the fineness of flax fiber has been improved by about 40%, and the strength has been improved. About 10%; the hemp fiber is about 50% more fine and about 10% stronger. In addition, the softness and curl of the fibers are also greatly improved, which undoubtedly provides a solid foundation for the production of refined yarns.
Technical features
Use two methods of boiling and high temperature splitting. The entire fine processing and yarn processing flow is: the original hemp - washing - a cook - pickling - two cook - washing - two drift - high temperature split - washing - oil - dehydration - drying. Hemp - hemp - open - comb - pull - draw - comb - comb - roving - spinning - (singe -) boil - (silk -) yarn dye - (and -) Packaging and storage. Make full use of the new, high-efficiency auxiliaries, so that the fiber can be quickly and efficiently split during processing to obtain a softening effect.
Key points in the process
The use of a penetrating agent with a very small molecular weight, high penetrating power, and an efficient swelling agent, which are used in combination, allows the fiber to be rapidly lysed under high temperature and high pressure, which helps the chemical agent penetrate quickly into the fiber and helps to eliminate the presence. Lignin, hemicellulose, and other gums inside the fiber structure.
In the scouring process, two-cooking and two-bleaching processes are used, which can produce chlorinated or oxidized lignin when bleached, and chlorinated or oxidized lignin can be easily dissolved in high-temperature lye and can effectively remove lignin. Na2CO3, which is softer than NaOH, is used in the second caustic so that the fiber can be slowly and thoroughly removed at high temperatures and for a long time.
After two scourings, Na2CO3 was used to swell the hemp fibres and the denaturation was carried out with a mild, slightly lower concentration of Na2CO3 under the effect of high temperature and high pressure. This is to make full use of the stability of cellulose under high temperature and high pressure, so that under the premise of strong damage to the fiber, the effect of swelling and crystallinity is reduced, thereby reducing the linear density of the fiber and improving the softness of the fiber.
Impact on energy and environment
This technology is very energy-efficient. Because this project completes the process of fiber degumming and dyeing, it can save 40% of investment in production equipment compared with traditional hemp roving, bleaching, and post-finishing and dyeing of grey fabrics. The use of water per ton of yarn was reduced from 900 tons of the original process to 300 tons, and the water consumption per 10,000 meters of finished fabric was reduced from the original 2,600 tons (including spinning and dyeing) to 930 tons, saving 63%.
Recently, as the refined hemp fiber processing technology passes the expert appraisal organized by Zhejiang Science and Technology Department, some “fatal†issues of the above-mentioned hemp fabrics will be effectively solved. So, what kind of technology is fine fiber processing technology?
Achievable results
Without destroying various excellent properties of hemp fiber, this technology can improve the fineness of the hemp fiber, make it more flexible, and can spin the high hemp yarn and improve the softness of the hemp fabric, effectively solving the problem of itching. In this way, the requirement of using hemp yarn as a knitted fabric to make the undergarment can be satisfied, which greatly expands the use of hemp fabric.
Tests show that the performance of hemp fiber has been greatly improved after refinement. The fineness of ramie fiber has been improved by nearly 10%, and the strength has been slightly improved; the fineness of flax fiber has been improved by about 40%, and the strength has been improved. About 10%; the hemp fiber is about 50% more fine and about 10% stronger. In addition, the softness and curl of the fibers are also greatly improved, which undoubtedly provides a solid foundation for the production of refined yarns.
Technical features
Use two methods of boiling and high temperature splitting. The entire fine processing and yarn processing flow is: the original hemp - washing - a cook - pickling - two cook - washing - two drift - high temperature split - washing - oil - dehydration - drying. Hemp - hemp - open - comb - pull - draw - comb - comb - roving - spinning - (singe -) boil - (silk -) yarn dye - (and -) Packaging and storage. Make full use of the new, high-efficiency auxiliaries, so that the fiber can be quickly and efficiently split during processing to obtain a softening effect.
Key points in the process
The use of a penetrating agent with a very small molecular weight, high penetrating power, and an efficient swelling agent, which are used in combination, allows the fiber to be rapidly lysed under high temperature and high pressure, which helps the chemical agent penetrate quickly into the fiber and helps to eliminate the presence. Lignin, hemicellulose, and other gums inside the fiber structure.
In the scouring process, two-cooking and two-bleaching processes are used, which can produce chlorinated or oxidized lignin when bleached, and chlorinated or oxidized lignin can be easily dissolved in high-temperature lye and can effectively remove lignin. Na2CO3, which is softer than NaOH, is used in the second caustic so that the fiber can be slowly and thoroughly removed at high temperatures and for a long time.
After two scourings, Na2CO3 was used to swell the hemp fibres and the denaturation was carried out with a mild, slightly lower concentration of Na2CO3 under the effect of high temperature and high pressure. This is to make full use of the stability of cellulose under high temperature and high pressure, so that under the premise of strong damage to the fiber, the effect of swelling and crystallinity is reduced, thereby reducing the linear density of the fiber and improving the softness of the fiber.
Impact on energy and environment
This technology is very energy-efficient. Because this project completes the process of fiber degumming and dyeing, it can save 40% of investment in production equipment compared with traditional hemp roving, bleaching, and post-finishing and dyeing of grey fabrics. The use of water per ton of yarn was reduced from 900 tons of the original process to 300 tons, and the water consumption per 10,000 meters of finished fabric was reduced from the original 2,600 tons (including spinning and dyeing) to 930 tons, saving 63%.