Thoughts and Suggestions on the Technical Progress of China's Nonwovens Industry

1. The status quo of technology development in the nonwovens industry

(1) Current status of science and technology development in the international nonwovens industry

The industrial production of modern non-woven fabrics originated in the 1950s and has achieved rapid development in more than 40 years. In 1986, the world ’s non-woven production was about 1 million tons, in 1995 it exceeded 2 million tons, and in 1998 it reached 2.8 million tons. The output value of cloth coils reached 10 billion US dollars, and the product after copy processing reached 35 billion US dollars; the average annual growth rate in the 1980s was 8%, and the average annual growth rate in the first five years of the 1990s was still 8%. The average growth rate will still reach 6%.

The rapid development of the world ’s nonwovens industry and its rapid expansion in industrial distribution in developed countries and regions (the United States and Western Europe) are entirely based on product development and market development, especially high-tech penetration, technological innovation, and technological progress. Basic. Contemporary non-woven fabric technology has become a new fiber processing technology that has the most processing methods, flexible and combinable applications, and can be engineered according to product performance requirements in addition to traditional textile technology. Its importance is constantly being sought by people. understanding. It is the development and progress of science and technology that makes nonwovens stand out and become an independent, fast-developing and diverse product emerging industry sector.

The rise of the modern nonwovens industry has benefited from the development of petrochemicals and synthetic fiber materials. Due to the needs of new non-woven fabric processing technology and products (especially industrial non-woven fabrics), high-tech methods are used to study the molecular structure of high-molecular polymers, and the polymerization process, polymer modification and spinning process and equipment Conducted a series of studies and made breakthrough progress. Research and development of a series of non-woven special polymer chips, differentiated fibers, functional fibers. In addition, inorganic fibers (glass fibers, ceramic fibers, silicon carbide fibers, boron fibers, etc.) for nonwoven fabrics, metal fibers (fine stainless steel fibers), etc. have also been developed. In recent years, "green" viscose fiber Lyocell and biodegradable microbial polymer fiber produced by biotechnology have also been developed. All kinds of fibers, combined with a variety of non-woven processing technologies, can produce non-woven products with different performances and rich and colorful, especially various high-performance industrial non-woven products.

The improvement of modern non-woven fabric processing technology is closely related to the penetration and application of high and new technology. At present, we have spinning web, melt-blown, staple fiber web, dry papermaking, wet webbing, needle punching, stitching, thermal fusion (hot air, hot rolling, ultrasonic heat) Fusing, etc.), chemical bonding, spunlace (spunlace) and other web forming and web consolidation processing technologies; lamination, compounding, molding, ultrasonic or high frequency welding and other replication processing technologies. At present, the most advanced short fiber hot rolling production line width can reach 5m, the production speed can reach 300m / min; the spunlace production line width can reach 4m, the production speed can reach 250m / min ~ 300m / min; the spunbond production line width can reach 5.2m, the spinning speed can reach 2000m / min ~ 6000m / min, the airflow speed is higher; the width of the melt-blown production line can reach 5.2m, and the temperature when the high-temperature and high-pressure air passes through the spinneret or nozzle hole can reach 260-480 ℃, the flow rate can reach the speed of sound. If it is not due to the application of high-tech design, manufacturing and installation of high-level control system and software equipment, it is impossible to achieve such a high level.

*. Computer-aided design and manufacturing technology (CAD / CAM) are widely used in the design and manufacture of various non-woven equipment

*. Mechatronics, microelectronic technology and computer technology are widely used in various high-efficiency, high-yield, high-quality nonwoven production lines, such as various programmable controllers (PLC), frequency conversion speed control system, computer centralized control technology Wait.

*. Laser, ultrasonic and high-frequency technology are widely used in non-woven equipment, production technology and product replication.

*. The new material is used for key components of non-woven fabric equipment, such as carbon fiber reinforced composite materials for high-speed needle punching machine needles with needle punching frequency up to 3300r / min? Niu? Chun Xianru is suspected of manufacturing the high-pressure pump piston of the jet-spraying machine of 0Mpa.

*. Information technology is used for remote control fault diagnosis and troubleshooting of programmable controllers, etc.

*. A variety of high-tech sensors, programmable controllers, computer systems are used to control the production process process parameters and nonwoven fabric quality parameters in the process control and online quality control of modern high-speed, high-yield, high-quality nonwoven production lines To ensure that the production process is controlled and product quality is guaranteed.

*. The technological progress of non-woven fabric processing technology and equipment is also reflected in the more combined application of various technologies, such as the combination of dry web forming and spinning netting, and the combination of spinning web forming and meltblown ), Direct compounding of spinning net and microporous membrane, etc.

All kinds of new nonwoven materials penetrate into environmental protection filtration, medical treatment, sanitation, health care, industry, agriculture, civil engineering, water conservancy engineering, construction, home facilities and daily life more widely. In recent years, a large number of innovative new nonwoven products have been developed, such as the use of Teflon fibers and polyamide fibers through Rontex needle punching

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