Acupuncture nonwovens: not only dust this thing

Acupuncture accounts for about 28% to 30% of the non-woven fabric production line, and the current domestic production capacity is close to 300,000 tons. From the sixth National Acupuncture Nonwovens Production Technology and Application Conference held in Changshu, Jiangsu Province in December 2009, the reporter did feel the prospect of prosperous industry. Insiders say that besides being used for conventional air filtration and dust control, the new application space for needle-punched nonwovens is being expanded. Transport, industrial wipes ... any combination of non-woven processes or combinations of types is actually possible. This makes its characteristics ideally suited to special, more demanding applications.

Process composite application

Polyester spunbond acupuncture non-woven fabrics have high production speed, low raw material consumption, energy saving, small equipment footprint, compact structure, and have gradually replaced short fiber geotextiles in recent years. The reporter also learned from the application department that polyester spunbonded and needled geotextiles have the functions of high strength and reinforcement, isolation, filtration, drainage, and imperviousness. They can be widely used in water conservancy construction, road construction, and building waterproofing facilities. A user-approved geosynthetic product with superior superiority.

Acupuncture nonwovens have the most products for filtering materials, and innovative spunbond acupuncture technology has come in handy: Spunbond acupuncture technology has a large thickness, a low density, good air permeability and a large dust holding capacity. In response to users' feedback on the problem of inaccurate filtration of spunbond acupuncture technology, in recent years, manufacturing companies have actively adopted methods such as reducing single fiber denier, using foreign fibers, and developing special needles to effectively improve product filtration accuracy. In order to improve the competitiveness of this product, Foshan City, Foshan City, Lepu Special Materials Co., Ltd. and other companies to start from a number of aspects, the use of recycled bottle tablets as raw materials, reduce production costs; improve drafting technology, reduce energy consumption; give play to the advantages of spunbond technology , improve product performance.

Nanjing Jihua 3521 Special Equipment Co., Ltd. has developed high-temperature filter materials by acupuncture and spunlacing. According to reports, ordinary needle-punched filter materials have a greater damage to the base fabric of the filter material due to thorns (damage to fiber generally reaches 25%), and the longitudinal strength of the filter material is obviously lower than that of the zonal strength; The production of heavy products by the weaving process has the disadvantages of high moisture content and difficulty in drying, and the processing is difficult. Jihua 3521 uses acupuncture and spunlace compounding technology, that is, after pre-acupuncture, it can be processed by hydroentangling and can achieve the purpose of not damaging the base fabric. Spunlace damage to fiber is generally 5%, which significantly improves the longitude and latitude strength, making the two The intensity is close. This kind of acupuncture and hydroentangling composite technology also breaks through the bottleneck of the mechanical strength of the filter bag caused by a large number of severed filaments in the acupuncture compounding process, and has certain improvements in the filtration efficiency and filtration accuracy.

New fiber composite grade high

At present, high-performance fibers for high-temperature filtration products include glass fibers, Nomex fibers, P84 fibers, PPS fibers, and PETT fibers. Due to the characteristics of the first few fibers, the range of use has been affected. The glass fiber is relatively brittle, and the Nomex fiber has poor oxidation resistance. The P84 fiber is susceptible to hydrolysis and aging, and the PPS fiber has a lower use temperature. The PETT fiber is chemically resistant and resistant to high temperatures and can be used in a variety of harsh environments to achieve better results. It also has a longer life than other fibers. China has already formed industrialized production of 100% PETT filter material, and the needled filter felt product developed by Xiamen Three-dimensional Wire Environmental Protection Co., Ltd. has applied for a patent.

Although PETT has good temperature and chemical resistance, it is expensive and the filtration efficiency is not superior to other fiber filters. For this reason, companies add appropriate amount of ultra-fine glass fiber to them, which will not affect the temperature resistance, but also increase the filtration efficiency of the filter media and reduce the rate of material feed. It also expands the application range and prolongs the service life. At this exchange meeting, the reporter contacted a number of enterprises that produce PETT. They are very optimistic about the application of this fiber. How to expand sales is the key to the present.

The leather base fabrics with new fiber composite needled nonwovens conform to the development trend of artificial leathers with high physical, ecological, and functional properties. In recent two years, the application of ultra-fine fiber materials in particular has greatly promoted the market for artificial leather and synthetic leather products, making them waterproof, moisture-permeable, anti-bacterial and odor-resistant, and the functionalities of temperature-regulating fibers and fibers that have undergone surface modification. Leather base cloth is entering the high-end market of synthetic leather.

Standards do not change development difficulties

Standardization issues such as large standard gaps and delayed lags in needle-punched non-woven fabrics products are also valued by all parties involved in production and application. On the one hand, product producers often pay attention to the general performance of the product and use the national or industrial standards recommended by the textile industry. Product users often focus on product engineering performance and use relevant industry specifications.

Experts also pointed out that industrial textiles involve areas such as safety, sanitation, and environmental protection. In accordance with the standardization law, mandatory standards should be formulated, but there are few existing mandatory standards, and this also affects the difficulty of unification of standards and indicators. The intensity is also affected.

In addition, the standard system is not in line with international standards. In view of the lack of centralized management of the industrial textile industry in China, there are no agencies that pay close attention to and specialize in international and foreign advanced industrial textile standards. The collection, aggregation, and analysis of relevant standard information are not adequately used, resulting in index requirements and testing methods and international standards. Inconsistent formulation. This non-connection has directly led to the export companies to either passively accept customer requirements or increase the number of foreign-designated tests and product certifications. The company's own product design and development are blind. As an example by the Shandong Fiber Inspection Bureau, Liu Yonggui, the GB/T17639-2008 standard cites 20 standards, of which only 5 standards are equivalent and 1 standard has changed the international standards. There is no equivalent of adopting international standards. Wu Xiongying of Shanghai Entry-Exit Inspection and Quarantine Bureau also mentioned that he compared the actual work, and there is no corresponding standard for many of China's and ISO current acupuncture non-woven method standards.

The use of industrial textiles is not uniform. It has its own strangeness and complexity that other textiles do not have. It is a test for all personnel involved in the industrial textiles, including experts. Even if there are some standards such as geosynthetic materials and medical textiles, they cannot cover all products and restrict the development of the industry. Therefore, the consensus of the industry is to fully mobilize the enthusiasm and role of the industrial textile associations at all levels, speed up the formulation and revision of industrial textiles standards, and jointly promote the scientific and standardized operation of industrial textiles standardization.