Acupuncture technology plays a significant role in the nonwoven fabric production line, accounting for approximately 28% to 30% of the process. Currently, domestic production capacity has reached nearly 300,000 tons. At the 6th National Acupuncture Nonwoven Production Technology and Application Exchange held in Changshu, Jiangsu Province in December 2009, the reporter was impressed by the promising future of this industry. Industry insiders noted that acupuncture nonwovens are not only used for conventional air filtration and dust control but are also expanding into new application areas such as transportation, industrial wiping, and more. Virtually any combination of nonwoven processes or fiber types is possible, making these materials ideal for specialized and high-demand applications.
The process of composite applications using polyester spunbond needle-punched nonwovens offers high production speed, low raw material consumption, energy efficiency, compact equipment design, and a small footprint. In recent years, this technology has gradually replaced staple fiber geotextiles. According to reports from application departments, polyester spunbond needle-punched geotextiles offer high strength, reinforcement, isolation, filtration, drainage, and seepage control functions, making them widely applicable in water conservancy, road construction, and building waterproofing. These materials have gained widespread recognition as high-quality geosynthetics.
Needle-punched nonwoven filter materials are commonly used, and innovative spunbond acupuncture technology has proven effective in various fields. Spunbond acupuncture technology produces thicker, less dense materials with good air permeability and dust-holding capacity. However, due to user feedback about insufficient filtration accuracy, manufacturers have actively improved the technology by reducing single fiber fineness, using heterofibers, and developing special needles to enhance product performance.
In response to the need for greater competitiveness, companies like Foshan City’s Sri Lankan Special Materials Co., Ltd. have adopted multiple strategies, including using recycled bottles as raw materials to reduce costs, improving drafting technology to lower energy consumption, and leveraging the advantages of spunbond technology to enhance product performance.
Nanjing Jihua 3521 Special Equipment Co., Ltd. has developed high-temperature filter materials using an acupuncture spunlace composite process. Compared to traditional needle-punched filter materials, which can cause up to 25% fiber damage, this method reduces fiber damage to around 5%, significantly increasing both longitudinal and transverse strength, making the two comparable. This technology has overcome mechanical strength limitations caused by excessive cut filaments in traditional methods, improving filtration efficiency and precision.
Currently, high-performance fibers used in high-temperature filtration products include glass fiber, Nomex, P84, PPS, and PETT. However, each has its own drawbacks—glass fiber is brittle, Nomex lacks oxidation resistance, P84 is prone to hydrolysis, and PPS operates at lower temperatures. PETT fiber, on the other hand, offers excellent chemical resistance and heat resistance, performing well in harsh environments and providing a longer service life than other filter media. China has achieved 100% industrialized production of PETT filters, with companies like Xiamen Three-Dimensional Wire Environmental Protection Co., Ltd. developing patented acupuncture filter felt products.
Despite its advantages, PETT fiber is costly and does not always offer a clear cost advantage over other fibers. To address this, some enterprises have started incorporating a certain amount of ultra-fine glass fiber, maintaining temperature resistance while improving filtration efficiency and reducing material costs, thus broadening application scope and extending service life.
At the exchange meeting, the reporter met with several PETT producers, who expressed strong optimism about the fiber's potential. Expanding sales remains the key challenge at this stage.
New fiber composites are also gaining traction in the production of nonwoven leather fabrics, aligning with the development trends of artificial leather that emphasize high physical properties, ecological sustainability, and functional performance. Over the past two years, the use of ultrafine fiber materials has significantly boosted the synthetic leather market, enhancing features like waterproofing, breathability, antibacterial properties, and deodorization. Tempered and surface-modified fibers have further elevated the quality of leather fabrics, enabling them to enter the high-end synthetic leather market.
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