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Spunlace method, also known as spunlace forming method, is an important non-woven fabric processing technology. Due to the unique technology of spunlace method, it is widely used in medical and health products and synthetic leather base fabrics, shirts, home decoration fields . Its fiber raw materials come from a wide range of sources, such as polyester, nylon, polypropylene, and viscose fibers. At present, the main uses of spunlace cloth are three categories, namely medical, leather and cleaning, and its sales direction: the leather spunlace is mainly for domestic sales, the medical spunlace is mainly for export, and the spunlace is for cleaning Export and domestic sales each account for a part. The highest selling price is about 36,000 yuan / ton.
1. New technology:
1. Spunlace composite technology: The research and development of the spunlace composite technology not only overcomes the limitations of some nonwoven products, increases the variety of colors, greatly expands the application field of spunlace nonwovens, but also promotes the spunlace technology Even the development and improvement of the entire non-woven fabric process. (1) Composite technology of spunlace and wood pulp air-laid. Because the price of wood pulp is much cheaper than the short fiber commonly used in spunlace method, and the fluff pulp is very hygroscopic and feels good, the product made is cheaper than the product with all fibers, which is very competitive in price, but in the process The requirements on the filtration system are very high. The product can be used as the core material of wipers (70% g / m2), diapers and sanitary napkins. The spunlace and wood pulp air-laid composite equipment include Fleissner's Aquapulp and Perfojet's Airlace. (2) Spunlace and filament spunbond web composite technology. The product compounded by this method has both the strength of the spunbond nonwoven fabric and the good absorption performance of the short fiber, and is more uniform and softer than the spunbond nonwoven fabric, has the function of water absorption and oil absorption, and has higher strength, and can be used as a food wrapping , Decorative cloth and cleaning cloth, etc. The spunlace and spunbond composite equipment include Flerssner's Aquqspun and Aquasplit. And Freudenberg's Evolon processing technology. (3) Composite technology of spunlace and wet-laid network. Typical process Detex's Hydraspun technology is composed of Detex's wet-laid technology combined with the Japanese Soflom spunlace method registered by Unicharm. The strength and softness of Hyderaspun wet spunlace nonwoven fabric is equal to or even higher than that of traditional dry spunlace nonwoven fabric, and the wet spunlace nonwoven fabric does not give off lint. Non-woven fabrics are twice, especially suitable for clothing.
2. New technology of spunlace fabric finishing function: In 1995, American BBA company developed Interspun process and applied for a patent. Using this process, the surface of the fabric is treated by spunlace, which can have a positive effect on the structure and performance of the fabric. In 1998, BBA and Fleissner signed a cooperation agreement, Fleissner is the exclusive machine supplier of this technology. Fleissner's Aquatex is a system that uses a spunlace head to process woven fabrics, and is called a revolutionary measure for the finishing process of woven fabrics. After the spunlace treatment of the woven fabric, the yarn in the fabric is loosened, and the fabric is effectively cleaned; depending on the layout of the spunlace head, the peach skin effect can be obtained on both or single sides of the fabric; it can also be eliminated The stress generated by the fabric during the process makes the warp yarns more uniform, thereby improving the texture and appearance of the fabric, increasing the thickness of the fabric, and making the fabric soft and soft. The wear resistance is more than 300% before treatment. The phenomenon is more than doubled, the pilling resistance is improved, the wrinkle resistance is improved, the cloth surface is more uniform, the cloth surface pores are reduced, and the distribution is more uniform. It is used for dyeing cotton fabrics like warp treatment. Therefore, after the spunlace treatment, the processes of desizing, smelting, mercerizing, sanding, etc. can be cancelled, and the bleaching process can also be simplified, with obvious comprehensive economic benefits. Products are widely used in decorative fabrics, filter fabrics, home textiles, clothing, automobile airbag fabrics.
3. New development of spunlace technology: Memis Acar research of Department of Mechanical Engineering, Loughborough University, UK has proved that spunlace process can process glass fiber and produce industrial cloth. Because glass fiber has no curl, the traditional concept is that dry nonwoven process is difficult to process . Most glass fiber nonwoven fabrics are generally processed by needle punching or wet process, but North Carolina State University (NCSN) has successfully developed spunlace nonwoven fabrics blended with glass fiber and polyester. Coarse denier glass fiber with a diameter of 16um is difficult to process with the spunlace method. If mixed with fine denier glass fiber with a diameter of 6.5um, it will help to improve the strength of the spunlace nonwoven. Conducive to spunlace, coarse denier fiber is conducive to improving the strength of spunlace nonwoven fabric. If glass fiber is mixed with textile staple fiber such as polyester, it can enhance the hydroentanglement ability. By mixing glass fiber with low-melting polyester, glass-reinforced polyester composite materials can be produced. Researchers at Auburm University in the United States have discovered that the spunlace method can produce geotextiles using NGSN equipment. Geotextiles are currently produced by needle punching and hot rolling processes. The researchers found that changing the spunlace pressure and the time the web is exposed to the water needle can change the pore size of the geotextile. Pore ​​diameter is a key indicator of geotextile, especially when it is used as a sand filter layer to allow water to pass through and prevent soil movement. Extending the time the web is exposed to the water needle or increasing the hydroentanglement pressure can enhance the web hydroentanglement effect and reduce the fabric pore size. The aperture size can be adjusted online without stopping, thereby increasing the production speed, which is more flexible and simple than other processing techniques of geotextile.
2. New products
The spunlace processing technology has made breakthrough progress. PGI's Miratec spunlace nonwoven fabric and Freudonberg's Evolon spunlace nonwoven fabric are new generation of spunlace products capable of replacing textiles and knitwear. France ’s broad market prospects and development direction make the best annotations, opening up a new market with great potential for spunlace technology.
PGI's Miratec fabric is the most innovative development of spunlace nonwovens both in concept and performance. Time will tell people whether Miratec fabrics can create a broad market in the durable textiles it targets, and price may be the main factor worth considering