The Function and Application of Non-woven Geotextile
Abstract: The concept, classification and raw materials of filament nonwoven geotextile for sale are introduced. The three manufacturing processes of non-woven high quality filament nonwoven geotextile and the functions and applications of non-woven filament nonwoven geotextile manufacturers are summarized.
Keywords: filament nonwoven geotextile manufacturers; manufacturing process; function; application
Geotextiles are textiles used in civil engineering and have successfully replaced metal strips that have been used in various reinforcement fields to overcome the weakness of soil tension. The widespread use of high quality filament nonwoven geotextile in the field of reinforcement is not only due to their low stiffness properties, but they are also compatible with soil in terms of deformability, and they increase the shear strength and ductility of the soil. filament nonwoven geotextile manufacturers is a new type of building material. It is widely used in railway, highway, water conservancy, electric power, metallurgy, mining, construction, military, seaport, agriculture, and other fields. It has drainage, filtration, isolation, reinforcement, protection, anti-seepage and prevention. Leakage and other functions, together with wood, steel, cement, collectively referred to as the four major building materials. In 1926, filament nonwoven geotextile for sale were first used in the field of geotechnical engineering in the Netherlands; in the late 1950s, the United States first used filament nonwoven geotextile manufacturers in the field of beach revetment engineering to replace traditional sandstone filter materials; in the early 1980s, geotechnical engineering Cloth began to be applied in China’s railway and water conservancy departments.
1. Overview of non-woven geotextiles
According to different processing and production methods, filament nonwoven geotextile manufacturers can be roughly divided into four types: textile high quality filament nonwoven geotextile, non-woven filament nonwoven geotextile manufacturers, synthetic filament nonwoven geotextile manufacturers, and composite filament nonwoven geotextile manufacturers. According to different methods of forming and fixing, non-woven filament nonwoven geotextile for sale can be divided into three types: spinning clay fabrics, staple fiber needle-punched high quality filament nonwoven geotextile, and hot-melt adhesive filament nonwoven geotextile manufacturers. In China, the spunbonded filament high quality filament nonwoven geotextile is mainly polyester fiber (polyester). The polyester fiber non-woven geotextile has high strength, high melting point, excellent toughness and creep properties, and can meet engineering requirements especially in anti-ultraviolet and anti-aging properties. In recent years, polypropylene spunbonded filament nonwoven geotextile manufacturers have gradually entered the domestic market, such as high-strength coarse-denier polypropylene spunbonded needle-punched geotextiles developed by Tiandingfeng Nonwovens Co., Ltd. Compared with spun clay fabrics, there are many types of short-fiber needle-punched nonwoven filament nonwoven geotextile manufacturers, including polyester fiber nonwoven filament nonwoven geotextile manufacturers, polypropylene fiber nonwoven high quality filament nonwoven geotextile, polyamide fiber nonwoven filament nonwoven geotextile for sale, and polyvinyl alcohol fiber nonwovens. Geotextiles, etc. Among them, polyester and polypropylene fiber nonwoven filament nonwoven geotextile manufacturers are the most widely used. The staple fiber needle-punched filament nonwoven geotextile manufacturers is soft in texture, fluffy in structure, good in water absorption and water permeability, suitable for various water seepage and drainage systems, and is also suitable for roadbed, but its strength is poor and tear resistance is poor; sticky non-woven high quality filament nonwoven geotextile due to The bonding point can not produce slippage, the cloth surface is relatively stiff, and the tear resistance is poor, so it is rarely used in civil engineering.
China’s high quality filament nonwoven geotextile raw materials mainly include polyester fiber, polypropylene fiber, polyamide fiber, polyvinyl alcohol fiber and so on. In recent years, certain natural fibers, biodegradable fibers, and inorganic fibers have been gradually used in raw materials for filament nonwoven geotextile for sale at home and abroad. Relevant research has shown that some natural fibers can be applied to the roadbed, drainage, bank protection, soil erosion control, such as jute, kenaf, coconut shell fiber, bamboo pulp fiber and so on. Rawal et al. analyzed the structure of jute and polyester nonwoven high quality filament nonwoven geotextile. The results show that the former has less anisotropy and the fabric is tight. DSTechnicalNonwove has developed a polylactic acid filament nonwoven geotextile for sale for the protection of vegetation, which has the advantage of being biodegradable.
2. The nonwoven geotextile manufacturing process
Non-woven filament nonwoven geotextile manufacturers can be divided into three types according to different manufacturing processes: spinning clay fabrics, staple fiber needle-punched filament nonwoven geotextile for sale, and hot-melt adhesive high quality filament nonwoven geotextile.
2.1 Spunbonding process
The main process of the spunbonding process is: melting the particles or powder of the polymer, feeding it into an extruder and spinning into a continuous filament bundle, and randomly laying on the conveyor belt to form a web, the filament is not completely solidified yet. At the time, it is pressed with a hot pressing roller, or bonded with a binder, or reinforced with a needle punching method to form a continuous uniform filament nonwoven geotextile for sale. This method is simple in process, high in output, low in cost, and inexpensive. Since the filaments are laid into a net, such nonwoven fabrics have high strength, good elongation, and are not easily broken and torn. At present, the most widely used spunbonded filament nonwoven geotextile for sale are polyester filament spunbonded high quality filament nonwoven geotextile, and the fibers are arranged in a three-dimensional structure. In addition to good mechanical properties, it also has good vertical and horizontal drainage performance and good elongation properties, as well as high chemical resistance, such as bio-resistance, acid-base resistance, and aging resistance. At the same time, it has a wide pore size range, a tortuous pore size distribution, and excellent permeability and filtration properties. Polypropylene fiber has excellent acid and alkali resistance, especially acid and alkali resistance, superior to polyester fiber. Its application has an irreplaceable position in the harsh environment of underground acid and alkali and high cold, so polypropylene filament needle acupuncture filament nonwoven geotextile manufacturers are also gradually appearing on the market, and product performance is constantly improving.
2.2 Short fiber needle punching process
The fiber is mixed, combed (or airflow) into a net, laid, drawn and needled to form a finished product. The entanglement strength formed by the needling is sufficient to meet the tensile stress during laying without tearing. And broken. It is characterized by large thickness, high density, fluffy structure, good water absorption and water permeability, strong resistance to deformation, and its permeability coefficient is comparable to that of sand filter material, but it is more convenient to layout and the price is more affordable, so it is especially used as a filter material. Suitable. In addition, it also has certain enhancement and isolation functions, and can also be combined with other geosynthetic materials, with protection and other functions. Due to the characteristics of filtration and drainage of non-woven filament nonwoven geotextile for sale, special attention should be paid to the hydraulic properties, including effective pore size and permeability coefficient.
2.3 hot melt bonding process
The same synthetic fiber or two kinds of synthetic fibers with different melting points are opened, combed, mixed, laid, and passed through a pair of heated rolls to melt the low melting point fibers in the surface layer or the net of the web, and bond together to form a Weaving filament nonwoven geotextile for sale can also be used to spread the heat-bonding adhesive on the surface of the web and then through hot rolls to achieve fiber-to-fiber bonding. The key to hot-melt bonding is hot air drying. As the hot air penetrates the fiber web, the fibers are melted and bonded together to form a flake-like material. Thermally bonded nonwovens can be achieved by different heating methods. Adhesive methods, web types, carding processes, and web structures will all affect the performance and appearance quality of the final product. For the web of low-melting fiber or bicomponent fiber, hot-rolling bonding or hot-melt bonding can be used; for ordinary thermoplastic fibers and webs mixed with non-thermoplastic fibers, hot-rolling bonding can be used. In the case of the web forming process, the thermal bonding process has an important influence on the performance of the nonwoven fabric, which determines the final quality of the product.
3. The function of non-woven geotextile
Nonwoven filament nonwoven geotextile for sale are used in a variety of applications, including enhanced functions, isolation, filtration, drainage, filtration, and anti-seepage.
3.1 Strengthening functions
The reinforcing function of the non-woven filament nonwoven geotextile manufacturers is to improve the mechanical properties of the soil layer by utilizing the tensile properties of the high quality filament nonwoven geotextile and to limit the displacement of the geotechnical engineering during long-term use, which plays a certain stabilizing effect.
3.2 isolation function
The isolation function of the nonwoven filament nonwoven geotextile for sale is mainly manifested in two aspects. One is to prevent the mixing of different routes or different layers of materials, to maintain and improve the integrity and running performance of the two materials; the second is to prevent the pollution and corrosion of the filter layer. Ensure the quality of the project and speed up the progress of the project.
3.3 Filtering function
Non-woven filament nonwoven geotextile for sale has good water permeability and permeability and play a filter-like effect when they play a filtering role. They can effectively retain soil particles, fine sand and small stones to filter out water flow, prevent soil damage and maintain earth and stone engineering. stable.
3.4 Drainage function
Nonwoven high quality filament nonwoven geotextile is a good water-conducting material. The fabric itself forms a drainage channel, which collects excess water inside the soil structure and slowly discharges the soil along with the fabric.
3.5 Filter function
The back filtration means that the soil material subjected to the osmotic pressure is not lost while the liquid passes, and the non-woven high quality filament nonwoven geotextile can replace the traditional sand gravel filter layer, which has the advantages of reduced engineering quantity, convenient construction, and high speed.
3.6 Anti-seepage function
Anti-seepage refers to the prevention of liquid permeation loss. The synthetic material of non-woven filament nonwoven geotextile for sale and geomembrane is used as an anti-seepage layer, which is economical, durable and pollution-free.
4. Application of nonwoven geotextile
4.1 Application in geotechnical engineering
The filter layer slope protection structure composed of high quality filament nonwoven geotextile and block stone or concrete slab or the concrete bag form slope protection structure is applied to the slope surface of the bank to prevent the base soil of the bank slope from being washed or eroded by water flow, preventing bank collapse and landslide. And so on. The application of geotextiles in the slope foot protection project is mainly in the form of filament nonwoven geotextile manufacturers soft body drainage and filament nonwoven geotextile for sale soil bag structure. As a structure of the anti-shock protection, the impact of the water flow on the slope protection base is avoided to ensure the stability of the slope protection.
4.2 Application in hydraulic engineering
Geotextiles are usually not used alone. They are covered under the block stone or concrete precast slabs in the dike protection and river bottom protection to form a stable shield. filament nonwoven geotextile manufacturers can completely replace the filter layer composed of conventional sand and gravel, which acts as a counter filter to prevent the penetration of soil particles. In hydraulic engineering, filament nonwoven geotextile for sale is often placed between two different soils (materials) to avoid mixing and losing the integrity of various materials and structures, or the loss of soil particles. An impervious composite geomembrane is placed on the water-facing side of the dam, irrigation channels and pool to prevent leakage of water and toxic waste. Because the high quality filament nonwoven geotextile has high tensile strength and good flexibility, when it is laid in the soil in an appropriate manner, it can restrain the tensile strain of the soil, reduce the deformation of the soil, and thus increase the modulus of the soil and stability.
4.3 Application in anti-seepage engineering
The anti-seepage project is mainly applied in sewage treatment plants, fly ash yards, tailings storage yards, mine dumping sites, landfills, pollutant storage pools, environmental protection and hydraulic structure seepage prevention, and building anti-seepage. Agricultural fields, etc. In these waste ponds, stacking and squeezing for a long time generates harmful gases and liquids and leaks into the ground, causing contamination of groundwater and soil. For this reason, when constructing a waste pool, an anti-seepage composite geomembrane is generally used, which not only can effectively prevent leakage of toxic gases and liquids but also can reduce engineering cost.
4.4 Application in Old Road Repair and Highway Subgrade Protection
In the old road repair, the filament nonwoven geotextile for sale is used for the bottom layer of the road, replacing the stress reduction layer and the sealing layer, which can control and prevent the development of cracks, prevent the surface water from entering, and strengthen the ground. In the roadbed protection, the high quality filament nonwoven geotextile is laid on the bottom of the embankment, which can play a role of isolation and prevent soil erosion; it has good permeability and good drainage effect. Under the action of load or pumping, the water can be Discharge, while further compacting the soil. The high quality filament nonwoven geotextile can evenly transmit the force acting on it to the subgrade, which acts as a reinforcement to avoid local damage.
4.5 Application in soft foundation reinforcement engineering
Due to the high water content in the soft soil foundation, the soil is soft, the bearing capacity of the foundation is low, and the building is likely to cause subsidence or deformation during the construction process. Therefore, the filament nonwoven geotextile for sale is often laid on the soft soil foundation during construction to solve the construction encounter. Various problems.
In recent years, China has made certain achievements in the development and promotion of high quality filament nonwoven geotextile products and has developed rapidly. However, compared with the advanced countries in the world, there is a big gap in the variety, quantity, quality and breadth and depth of application. At present, the relevant state departments attach great importance to the application and promotion of high quality filament nonwoven geotextile, the filament nonwoven geotextile manufacturers standards are being intensified, and relevant policies and regulations are also being introduced. It is believed that filament nonwoven geotextile for sale will be built on the dams of large rivers and rivers in China, roads, railways, and airports. Environmental protection projects play an important role and their development will reach a new level.