Treatment and Utilization of Waste Natural Fiber Textiles

Regardless of natural fiber textiles or synthetic fiber textiles, there are mature technologies for the recycling of discarded textiles. With the development of science and technology, waste textile recycling technology has become more and more advanced. Discarded Synthetic Textile Textiles Recycling Processing Patented technology emerged as early as the 1980s. Wasted natural fiber textile recycling mechanics had complete sets of machined machinery in the 1970s.

To recycle waste textiles or perform harmless treatment, the composition, biodegradability, and environmental impact of waste textiles must be studied. Waste textiles have many types of fibers, and they are treated with various types of chemicals during textile dyeing and finishing. The burning properties of discarded textiles and the gas components produced after combustion are also different. Simple incineration is unreasonable, and waste textiles need to be studied. Pollution treatment methods. In addition, we must study ways and means of recycling and using waste textiles.

Treatment and Utilization of Waste Natural Fiber Textiles

Natural fiber recycling generally uses plant fibers (face and hemp) and animal fibers (wool fibers), yarns or fabrics (old clothes), which are mechanically decomposed into fibers, and then they are purely back-spun or blended to form woven fabrics. Plant fibers can also be used as non-woven fabric raw materials or treated (mainly decolorized, degreasing) for viscose fiber, Lyocell fiber and papermaking raw materials.

For synthetic fiber and vegetable fiber blended fabrics, the polyester in the polyester/cotton blended fabric is first hydrolyzed with sodium hydroxide to produce terephthalic acid and ethylene glycol, then the cotton fiber is filtered out and the filtered cotton fiber is washed, Drying, bleaching (sodium hypochlorite), water dissolving [thermal N-methylmorpholine-N-oxide (NMMNO)], spinning, finally forming Lyocell fibers.

Treatment and Utilization of Discarded Polymer Synthetic Fiber Textiles

There are two ways to process and use high-polymers in waste synthetic fiber textiles. First, these fibers are all high-molecular materials. Most of them have soluble (melting) lines. These polymer materials can be recovered by melting or dissolving. Other uses. The second is to further crack the recycled polymer material into macromolecule monomers, and then polymerize and spin fiber products. For example, a U.S. company uses waste nylon 6 carpet as raw material to produce 45,000 tons of caprolactam per year, which has the same performance as newly produced caprolactam.

Treatment and Utilization of Waste Mixed Fiber Textiles

Difficult to separate waste mixed fiber textiles, through mechanical re-decomposition into fiber, can be used for non-woven fabrics production of composite materials, such as the framework of materials.

Development and utilization of waste yarns in textile mills and waste fiber from chemical fiber plants

The development and utilization of the waste yarn of the textile mill and the waste fiber of the chemical fiber plant is a work of ecological significance and economic importance. The waste wire that can be used is the belly flower of the cleaning process and the cotton of the carding process. Flower and cover flower), combed noil, roving head, spun yarn, drum shake yarn, weaving yarn, chemical fiber waste yarn, etc.; weaving process, residual material cut off, garment cut-off, knitting production In the various waste, the entire waste clothing.

Soft return yarn (without yarn twist) Treatment: Swiss Lida's process flow is opener - single-roller axial flow opener - licker-in beater cotton opener - dust collector Send dust; Germany's Trützschler company's processing process for the six-roller trapezoidal opener - luring roller opener - heavy separator remove the heavy miscellaneous - combing needle roller open area - saw tooth roller open cotton District; German Te Ma France's processing process for the cotton box to the cotton machine - air separator - licker-opener, remove heavy impurities. After the yarn treatment, it can basically become a spinnable fiber.

Hard return yarns (called hard twisted yarns with twist and interweaving) Treatment: The French La Roche company's processing flow is to use 1~3 rotary cutters to make rags and yarns go through metal detectors and heavy separators. Into the cotton box to the cotton machine, evenly feed the multiple cylinder shredder. The open cylinders of the Duxilin shredder adopt dust cages to condense the cotton, with an exhaust dust filter system to avoid the ejection of cotton dust and ensure the quality of shredding and opening. In addition to the open fabric, the hard return yarn is mainly used to open new types of spinning yarn, non-woven fabrics, carpet yarns, garment yarns, synthetic fiber yarns, and spinning yarns. Use, not only less investment, there are very good ecological and economic benefits.