Application of Nonwovens in Industry
China's textile industry is divided into sixteen categories, the current non-woven fabric in most categories have a certain share, such as medical, health, environmental protection, geotechnical
China's textile industry is divided into sixteen categories, the current non-woven fabric in most categories have a certain share, such as medical, health, environmental protection, geotechnical, construction, automotive, agriculture, industry, safety, synthetic leather, packaging , Furniture, military and so on. In the fields of health, environmental protection, geotechnical construction, artificial leather, automobile, industry, packaging and furniture, nonwovens have occupied a large proportion and have been widely used in medical, agriculture, canopy, protection, military and other fields, Has also reached a certain market penetration rate. Hygiene materials Sanitary materials include daily use of diapers and sanitary napkins, adult incontinence products, baby care wipes, household and public places with clean wipes, wines and so on. Women's sanitary napkins are the fastest growing products in China's hygiene products and the highest market penetration rate. Since the beginning of the 1990s, the development speed has been remarkable. By 2001, the market penetration rate has exceeded 52% and the consumption has reached 33 billion, It is expected that by 2005 its market penetration rate can reach 60%, consumption reached 38.8 billion. With its development, its fabric, structure and built-in absorbent materials have also undergone a revolutionary change, fabric and side of the anti-seepage parts commonly used hot air, hot rolled, fine denier nonwoven fabric and SM S (spunbond / Meltblown / spunbond) composite materials, the internal absorption of materials is also widely used in SAP superabsorbent polymer slurry air into the network forming ultra-thin materials; baby diapers market penetration is still relatively low, but in recent But also in the adult incontinence products, baby care wipes, household and public facilities with clean wipes, etc. the domestic penetration rate is not high, some spunlace nonwovens manufacturers of water production Piercing cloth for the export. China's population and the popularity of health materials is still low, with the national economy to further improve the level of this area will become China's nonwovens one of the largest market. Medical supplies here mainly refers to the hospital with a variety of textile and non-woven fiber products, such as surgical clothing, surgical cap, masks, surgical cover cloth, shoe cover, sick clothes, bed supplies, gauze, bandages, dressings, tape Cloth, artificial body organs and so on. In this area, nonwovens in the shielding of bacteria and to prevent cross-infection play an extremely effective role in the developed countries in the medical textile products on the non-woven fabric has reached 70% to 90%, while China in addition to the use of spunbond The use of woven garments, masks, shoe covers and tape and other small quantities of supplies, the application of nonwovens material is still very popular, and even if the use of non-woven surgical supplies, in terms of functionality and grade with the developed countries There is a big gap. For example, Europe and the United States and other developed countries, the use of surgical clothing wearing comfortable and has good bacteria and blood barrier SM S composite materials or spunlace non-woven materials, and China is more use of spunbond and plastic composite surgery , The SM S has not yet widely accepted; widely used in foreign spunlaced non-woven bandages, gauze and mixed with wood pulp spunlaced surgical cloth, etc., have not yet used in the country; some high-tech medical materials in China or blank The In our country at the beginning of the year and the spread of SARS infection, for example, some areas of China in the face of sudden epidemics and even a moment can not find the relevant protective equipment standards and have good protective properties of materials. At present, most of our medical staff of the surgical clothing due to price problems have not yet equipped with a good shielding effect on bacteria and body fluids and wearing comfortable SM S clothing, which is the protection of medical staff is extremely unfavorable. With the rapid growth of our economy and the enhancement of people's health awareness, this area will also become a huge market for nonwovens. Geosynthetics Geosynthetics is a kind of engineering material which has developed rapidly in the late 1990s and developed in the late 1990s. The textile and nonwovens and their composites are one of the major categories of industrial textiles. We also known as geotextile. Geotextile is mainly used for various civil engineering, such as water conservancy, transportation, construction, harbor, airport and military facilities, to enhance, drainage, filtration, protection and other effects, can improve the quality and service life. China began to use the trial in the early 80s, to 1991 due to floods so that its application for the first time exceeded 100 million square meters, the 1998 floods caused by the national and civil sector attention, so that geosynthetics officially included Norms and began to establish the appropriate design specifications and application regulations. At this point, China's geosynthetics began to enter the normative development. It is reported that in 2002 the application of geosynthetics in China for the first time more than 250 million square meters, geosynthetics varieties are increasingly serialized. With the development of geotextile, China is suitable for the production of such products, non-woven fabric technology equipment has also been rapid development, from the beginning of the application of ordinary 2.5 meters below the staple stitch method gradually developed to width 4 ~ 6 m staple fiber acupuncture and 3.4 ~ 4.5 m polyester spunbond acupuncture method, the product is no longer simply use a single material but more use of a variety of materials composite or combination of the way, so that products in the Quality and meet the standardization requirements have been greatly improved. However, China's engineering volume from the point of view, China's geotextile is still far from universal to a wide range of non-woven products, compared with the developed countries there is no small gap. It is estimated that China's non-woven fabric in the proportion of cloth is still about 40%, while the United States as early as 80%. Building waterproof materials waterproof building materials is also the rapid development of China's industrial materials in recent years. China's early roof waterproof material for the paper and glass fiber linoleum, since the reform and opening up, China's construction materials have been an unprecedented development, its application has reached 40% of the total amount, of which SBS and APP and other modified asphalt waterproof The amount of coil applications from 1998 to more than 2000 million square meters in 2001 to 70 million square meters. In addition to the efforts to increase infrastructure construction, China has a huge potential market in this area, staple fiber acupuncture polyester base, spunbond needle polyester base and spunbond polypropylene and waterproof resin composite materials Will continue to occupy a certain market. Of course, in addition to the quality of water, the future need to consider the green building problems, including oil-based materials in varying degrees, there may be pollution and waste disposal problems. Environmental filter materials Textile filter material is the fastest growing in recent years, an industrial textiles. It is made of fiber, used to capture and separate the media or particles of particulate matter in water, play a role in the purification of air, liquid or extract useful substances in today's environment and ecological protection plays an important role. In recent years with the advent of a variety of different and high-performance fiber and the combination of various applications, so that non-woven fabric filter material in the application of breadth and performance have been greatly improved. Some foreign companies use silicon fiber, carbon fiber, metal fiber, high temperature and other fiber or paint to filter to acid, anti-fire, anti-static and high temperature and other effects, or through different processes into a network or composite way with Inside the table function is different, to achieve high efficiency gradient filter media. In this area, the largest application is air filtration, followed by transport tools, liquid filtration share is small, in the world only about 6%. In the non-woven filter, the main products used are acupuncture, meltblown and spunbond, spunlace and wet method, etc., is currently more use of composite materials, meltblown and spunbond materials Inefficient filtration field is increasingly replacing fiberglass filter. Foreign consultants believe that China is second only to the United States and Japan's air filtration market. China's development in the field of filtration more developed countries have a greater degree of lag in the varieties and grades also have a wide gap. And in China is currently nearly 170,000 tons of filtered products in the production of nonwovens also accounted for a smaller share. However, in the "Tenth Five-Year" period, China's environmental protection has become the focus of future development direction, its development potential can not be overlooked. Agricultural and horticultural materials The introduction of nonwovens in China's agricultural field is in the early 80s, in the next 20 years, many domestic research departments and agricultural sector cooperation, the development of various uses of agricultural products, such as since the last century Since the mid-80s to develop, experiment and promote the use of non-woven fabric vegetable greenhouses two curtains, greenhouse winter warm covering materials, nursery coverings, fruit protective bags, ginseng cultivation curtains, soilless cultivation base, artificial lawn and animal husbandry wind Shed, etc., played in advance or delayed crop maturity, adjust the temperature difference between inside and outside, to prevent pests and birds and against crops, improve crop yield and so on. China has a variety of greenhouse and vegetable shed covers an area of about 400 million mu, such as can use nonwovens for covering materials, the demand for up to about 2.6 billion square meters. Coupled with nursery, ginseng cultivation, animal husbandry protection and horticulture and other uses, the potential demand will be less than 5 billion square meters. While China is currently using the proportion of the area is still only about 10%. Therefore, China's agricultural use has a broad space for development. China is a synthetic leather production power. According to the China Industrial Textile Association statistics, China's synthetic leather fabric only, its output has more than 200,000 tons, completely changed by the import situation, and began to shift from domestic supply and growth. In synthetic leather and synthetic leather, non-woven fabric based on the excellent performance of synthetic leather presents a much higher than the growth rate of artificial leather. With the development of nonwovens, synthetic leather fabric is increasingly widely replaced by new non-woven materials, especially by the acupuncture and spunlace production of leather fabric has mushroomed to develop, greatly improved Synthetic leather base fabric quality, variety diversity and the final product grade. In such products, acupuncture mainly produces thick products, such as upper leather, etc .; spunlace products are mainly suitable for thin base fabric, such as shoes leather, suede clothing fabrics and so on. China also has some of the production of ultrafine fiber nonwoven synthetic leather, which produces a leather to catch up and beyond the leather's performance and appearance. Japan's synthetic leather production statistics, China's only more than 10 large enterprises of ultra-fine leather production reached 500 million square meters. Other industrial uses Many other industrial applications are also non-woven fabrics with potential market, such as automotive interior materials, automotive air filtration and oil filter materials, rubber reinforced materials, cable insulation and electrical insulation materials, electromagnetic shielding materials, protective clothing And labor insurance supplies, paper blankets, composite packaging and canopy cover materials, furniture, cladding materials and so on. These products have a greater demand for nonwovens. Non-woven fabric has a variety of processes, such as carding into a network of chemical bonding, thermal bonding, acupuncture, sewing method, spunlace, etc .; spinning directly into the network of spunbond, meltblown, Through the wet process of suspended pulp wet process and so on. Different processes have different adaptability to the above uses. Through the use of different fibers and high-functional fiber or mixed, different combinations of technology and finishing and composite processing, you can develop a wide variety of different performance of the industry with the final product. Author brief introduction Shen Zhiming, senior engineer, engaged in nonwovens technology research and information work for 15 years, won the provincial and ministerial level technology and product achievement award, write and publish hundreds of scientific papers, edited and published "new nonwovens Technology "a book. He is now the director of the Information Center of the Textile Industry Nonwovens Technology Development Center and the Secretary-General of the Textile Industry Nonwovens Productivity Promotion Center, the Spinning Branch of the China Industry Textiles Industry Association and the Deputy Secretary-General of the Spunlace Branch.