The recycled fiber industry refers to the industry that uses waste or waste cellulose materials to be treated through chemical and physical methods to reproduce cellulose fibers. This industry is important in the context of sustainable development and resource recycling. However, the recycled fiber industry also faces some challenges and problems. First of all, the recycled fiber industry faces some technical difficulties. The production process of recycled fibers is relatively complex and requires a variety of technical means such as chemical treatment and mechanical manufacturing. At present, the production technology of recycled fiber is not mature enough, and there are some technical problems, such as the unstable treatment effect of cellulose materials and high energy consumption in the production process. Therefore, the recycled fiber industry needs to increase technological research and innovation to improve production efficiency and quality. Secondly, the recycled fiber industry has problems in the supply of raw materials. The main raw materials of recycled fiber are waste or waste cellulose materials, such as pulp, waste paper, cotton textile waste, etc. However, the supply of these raw materials is limited and the quality is uneven. The recycling and disposal of waste is also facing certain difficulties, resulting in unstable supply of raw materials in the recycled fiber industry. Therefore, the recycled fiber industry needs to establish cooperative relationships with waste management departments and waste paper recycling companies to strengthen the supply and management of raw materials. Third, the recycled fiber industry faces challenges in terms of market promotion. Due to the higher production cost of recycled fiber, the price is often a certain percentage higher than that of traditional fiber. In addition, the quality and performance of recycled fibers are relatively low and cannot completely replace traditional fibers. These factors limit the market competitiveness and wide application of recycled fibers. Therefore, the recycled fiber industry needs to strengthen marketing and publicity to improve consumers' awareness and acceptance of recycled fiber products. Finally, the recycled fiber industry faces some challenges in terms of environmental protection. The production process of recycled fibers consumes a lot of water and chemicals, and also produces a certain amount of waste water and exhaust gas. If not handled properly, it may cause pollution to the environment. Therefore, the recycled fiber industry needs to strengthen environmental awareness, strengthen the treatment of wastewater and waste gas, and reduce the impact on the environment. In summary, the recycled fiber industry has some problems and challenges in technology, raw material supply, marketing and environmental protection. However, with the promotion of sustainable development concepts and the continuous advancement of technology, the recycled fiber industry is expected to usher in better development.

Recycling of waste to finished yarn processing is an environmentally friendly production and processing method that is of great significance for the efficient use of resources. With the improvement of people's awareness of environmental protection, the development of the waste recycling industry has broad prospects. First of all, recycling waste to finished yarn processing can effectively reduce waste generation and environmental pollution. Waste recycling can convert large amounts of waste into valuable resources, reducing landfill and incineration, and reducing the negative impact on the environment. Especially for the recycling and processing of textile waste, it can avoid waste textiles entering landfills and reduce the waste of land resources. Secondly, recycling scrap to finished yarn processing helps to save resources. Textile production requires a lot of raw materials, and waste recycling can reprocess waste textiles, saving a lot of raw materials and energy. Scrap recycling pairs

POLYESTER STAPLE FIBER IS A TYPE OF CHEMICAL FIBER. The fiber length is about 38mm, and the fineness is 1.5D. Chemical fibers are divided into polyester, acrylic, chlorine, spandex, vinylon, polypropylene, aramid and other categories according to chemical composition. In terms of morphology, it is divided into filament, medium and long fiber (generally 64mm in length), and staple fiber (mostly 38mm). Polyester staple fiber can be spun alone or blended with various cotton-type fibers such as cotton or staple fiber. Polyester staple fiber is a type of chemical fiber. The fiber length is about 38mm, and the fineness is 1.5D. Chemical fibers are divided into polyester, acrylic, chlorine, spandex, vinylon, polypropylene, aramid and other categories according to chemical composition. In terms of morphology, it is divided into filament, medium and long fiber (generally 64mm in length), and staple fiber (mostly 38mm). Polyester staple fiber can be spun alone or blended with various cotton-type fibers such as cotton or staple fiber. It is the largest amount of chemical fiber in China's textile industry.

Polyester yarn refers to polyester as raw material spinning yarn, polyester is a kind of polymer by spinning and made of fiber, mostly refers to ethylene phthalate as raw material production of fiber, according to the English name of its raw material "polyethylene terephthalate" abbreviation, referred to as "PET" fiber. In our country, it is commonly known as polyester. The so-called "yarn" is actually a collective term for "yarn" and "thread", which is defined as follows in clothing material science: "yarn" is to arrange many staple fibers or filaments into an approximately parallel state, and rotate and twist along the axial direction to form a slender object with a certain strength and linear density; A "thread" is a strand formed by twisting two or more single yarns. Yarn is a thin strand of cotton, wool, hemp, chemical fibers and other fibers that stretch and twist the fibers (usually used as raw materials for weaving), and then use cotton, linen, silk, wool and other fine strands of materials to form multiple strands, called threads.

Different classification methods produce different names: 1) Different raw materials used: cotton yarn, purified chemical fiber yarn, cotton-type blended yarn, wool-blended yarn, special-shaped yarn, etc. 2) Different spinning methods: ring spinning yarn, airflow spinning yarn, electrospinning yarn, etc. 3) The spinning process is different: carded cotton yarn, combed yarn, peach hair yarn, etc. 4) Different twisting directions: smooth twist (s twist) yarn, backhand twist (yarn z twist). 5) Different product uses: yarn for weaving, yarn for knitting, yarn for pileing, yarn for rope belt, yarn for fishing net, yarn for cord cloth, etc.

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