Development Status And Trend Prospect of Geotextile
Abstract: This paper summarizes the production process types and raw material types of polyester nonwoven geotextile wholesale, and proposes a wider range of application fields for non-woven polyester nonwoven geotextile manufacturers. Two kinds of non-woven geotechnical materials are introduced: filament spunbond needle punching technology and staple fiber needle punching technology. Cloth production process; based on the functional analysis of polyester nonwoven geotextile for sale, pointed out that anti-seepage engineering, high-speed rail ballastless track, fly ash yard project, tailings pond yard project, mine dumping site project, and ecological bag slope protection project, etc. The application field puts forward high standards of high strength, acid and alkali resistance, corrosion resistance and mildew resistance to polyester nonwoven geotextile high quality. It is proposed that high strength and environmentally resistant polypropylene filament spunbonded needled factory price polypropylene nonwoven geotextile are factory price polyester nonwoven geotextile industry. Important development direction.
1. Geotextile type and production process
As a new type of geotechnical engineering material, geosynthetics can be made from natural or synthetic polymers (plastic, chemical fiber, synthetic rubber, etc.) into various types of products, placed in the interior, surface or layers of soil. Between the soils, the role of strengthening (reinforcing) or protecting the soil. At present, polyester nonwoven geotextile wholesale has been widely used in various fields such as roads, railways, water conservancy, electric power, construction, seaports, mining, military, and environmental protection. The main varieties of geosynthetics are polyester nonwoven geotextile manufacturers, geogrids, geonets, geomembranes, geocells, geocomposites, geosynthetics, bentonite mats (GCL), geotechnical tubes, geotechnical foams, etc.
1.1 Geotextile type
Geotextile is a water-permeable geosynthetic material made of polymer fiber as raw material by hot pressing acupuncture, cementing and weaving. It is also called polyester nonwoven geotextile for sale, including woven and non-woven. Weaving polyester nonwoven geotextile high quality include products produced by weaving (flat weave, circular weave), weaving (plain weave, twill weave), knitting (warp knitting, stitching). Non-woven polypropylene nonwoven geotextile wholesale includes products produced by mechanical reinforcement (needle-punching, hydroentangling), chemical bonding (spraying, dipping), thermal bonding (hot rolling, hot air). factory price polyester nonwoven geotextile can be used alone in engineering applications, and can also be used in combination with other geosynthetic materials such as geogrids, geomembranes, and geonets.
Weaving polyester nonwoven geotextile manufacturers appeared in the 1960s. They are characterized by high strength, high cost, poor filtration, and drainage, and have limitations in engineering applications. Non-woven polypropylene nonwoven geotextile wholesale began in the late 1960s, and China began to apply this material to engineering entities in the early 1980s. Although China’s non-woven fabric industry started late, it has developed rapidly. High-performance raw materials give high strength and durability to the products. Advanced production technology gives the products a good function and expands its application range. Especially in the past 30 years, with the promotion of needle-punched nonwoven and spunbond nonwoven technology, the application field of non-woven factory price polyester nonwoven geotextile is more extensive than that of weaving polyester nonwoven geotextile high quality, and it has developed rapidly. China has developed into a world non-woven fabric. Produce a big country and gradually move towards a strong production country.
1.2 Geotextile materials
At present, the raw materials of polyester nonwoven geotextile wholesale are mainly composed of synthetic fibers. The selection of various synthetic fibers should be combined with the actual conditions of the project, considering the physical and chemical properties of the fields used, and the cost of the products. The most common applications are polyester and polypropylene fibers, followed by polyamide. Fiber and polyvinyl acetal fibers. Polyester fiber has good physical and mechanical properties factory price polypropylene nonwoven geotextile, excellent toughness and creeps properties, high melting point, high-temperature resistance, aging resistance, mature production process, and high market share. Disadvantages are poor hydrophobicity, easy to accumulate condensed water when used for thermal insulation materials, poor performance at low temperatures, easy glassing, reduced strength, and poor resistance to acids and bases. Polypropylene fiber has good elasticity and instant elastic recovery better than polyester fiber; it has excellent acid and alkali resistance, wear resistance polypropylene nonwoven geotextile manufacturers, mildew resistance and low-temperature resistance; it has good hydrophobicity and wicking performance, and can make moisture along the fiber axis. The transfer to the outer surface; the density is small, only 66% of the polyester fiber and the fine-denier fiber with compact structure and superior performance can be obtained by multiple drawing, and the strength can be further improved by the reinforcement process. The disadvantage is that it is not resistant to high temperature and has a softening point of 130 to 160 ° C. It has poor light resistance and is easily degraded and decomposed in sunlight factory price polypropylene nonwoven geotextile, but it can be made to have ultraviolet resistance by adding an auxiliary agent such as an ultraviolet absorber.
The raw material of the nonwoven polyester nonwoven geotextile manufacturers may be jute fiber, polyethylene fiber, polylactic acid (PLA) fiber or the like in addition to the above fiber. Natural fibers and special fibers have gradually entered various application fields of polyester nonwoven geotextile for sales, such as natural fibers (jute, coconut shell fiber, bamboo pulp fiber, etc.) in the fields of roadbed, drainage, bank protection, and control of soil erosion. With the continuous development of new materials, the selection of non-woven polypropylene nonwoven geotextile wholesale materials has been expanding, and with the advancement of production technology, more and more functional factory price polyester nonwoven geotextile has been on the market, showing the development of polypropylene nonwoven geotextile for sale.
1.3 Non-woven geotextile production process
Compared with woven polypropylene nonwoven geotextile high quality, non-woven polyester nonwoven geotextile wholesale has fewer production processes, higher production efficiency, lower production costs, and can be made into wider products. Therefore, non-woven polyester nonwoven geotextile high quality has developed rapidly in recent years. According to the different methods of forming the net, the common non-woven polypropylene nonwoven geotextile wholesale production process includes filament spunbond needle punching technology and staple fiber needle punching technology.
The filament spunbonding technique is to heat and melt the polymer, spin it into a continuous filament bundle polypropylene nonwoven geotextile manufacturers, draw it through the airflow, impart strength to the fiber, and lay it on the conveyor belt irregularly to form a web. When the filament bundle is not completely solidified At the time, the one-step forming nonwoven technique is reinforced by needle punching. This technology has a short process and high output. The polyester nonwoven geotextile manufacturers produced under the same specifications has better tensile strength, tear strength, elongation at break and aspect ratio than short fiber needled factory price polyester nonwoven geotextile. For engineering applications such as reinforcement and reinforcement. However, the investment in the spunbond acupuncture process equipment is large, the uniformity of the net formation, the flexibility of product conversion is poor, and it is not suitable for the production of small batches and varieties.
Short fiber needle punching technology is a two-step method of heating, melting, spinning, drawing, crimping, cutting polypropylene nonwoven geotextile manufacturers, and packing into short fiber materials, and short fiber opening factory price polypropylene nonwoven geotextile, carding, laying, and acupuncture consolidation. Formed non-woven technology, the product has a large thickness, high density, fluffy structure, good water absorption and water permeability, strong resistance to deformation, especially suitable for anti-filter materials. The needle-punched nonwoven fabric has a short technological process, uses many kinds of raw materials, has a simple equipment structure, and has a less one-time investment. Therefore, the polyester nonwoven geotextile for sale processed by short-fiber needle punching is the largest non-woven polypropylene nonwoven geotextile for sale in China.
2. The main function of geotextile
Geotextiles are used in a variety of applications, including filtration, drainage, isolation, reinforcement, protection and seepage prevention.
Because the polyester nonwoven geotextile wholesale has good water permeability and gas permeability, placing it in the soil structure allows the liquid inside the soil to pass through and discharge, and at the same time plays a role of soil conservation, which can effectively prevent upstream soil particles, fine sand, and small stone. Loss, prevent soil damage and keep the project safe and stable. If polypropylene nonwoven geotextile wholesale is used to prevent the migration of soil particles into the drainage aggregate or drain pipe while keeping the drainage system working properly; laying polyester nonwoven geotextile high quality under the riprap protection layer and other revetment materials on the coast and riverbank can prevent soil erosion and prevent riverbanks. Collapse and so on.
As a good water-conducting material, the polypropylene nonwoven geotextile for sale itself acts as a drainage channel, which can collect the moisture inside the soil structure in the factory price polyester nonwoven geotextile and slowly discharge the soil along with the material. At present, it has been widely used in earth and rock dam drainage, underground drainage, roadbed, retaining wall and soft soil foundation drainage. For example, the polypropylene nonwoven geotextile high quality laid in the bottom layer of the embankment can be used as a drainage channel to exclude groundwater, and can also be used as a reinforced material to improve the stability of the embankment.
Isolation means that polyester nonwoven geotextile manufacturers can separate two materials with different properties to avoid mixing and losing the integrity and structural integrity of various materials. For example, polypropylene nonwoven geotextile for sale laid between ordinary railway turnouts and roadbeds can effectively separate gravel ballasts and soil roadbeds.
The geotechnical arrangement is arranged inside the soil as reinforced material, or the polyester nonwoven geotextile wholesale combines with the soil to form a composite body. Compared with the unreinforced soil, the strength and deformation performance of the reinforced composite soil are obviously improved. If the factory price polyester nonwoven geotextile is used to strengthen the tensile strength of the soil, the reinforced soil steep slope or the reinforced earth retaining wall can be constructed; the polyester nonwoven geotextile high quality in the reinforced cushion can improve the stability of the embankment.
2.5 Anti-seepage effect
The combination of polypropylene nonwoven geotextile high quality and geomembrane has low water permeability (gas), which can prevent liquid or gas from flowing and spreading, and exerts anti-seepage or containment. Such as reservoir seepage prevention, earth polypropylene nonwoven geotextile manufacturers, and rock dam seepage prevention and landfill anti-seepage.
By installing polypropylene nonwoven geotextile for sale protection measures, soil erosion caused by rainfall shocks and surface water runoff can be reduced. If the polyester nonwoven geotextile for sale is combined with the geonet and laid on the surface of the bare soil of the slope, the erosion of precipitation and surface runoff can be effectively avoided or mitigated; the silt fence made of factory price polyester nonwoven geotextile can filter out the suspended soil in the turbid runoff. Particles, etc.
In addition, polypropylene nonwoven geotextile manufacturers can play other roles. For example, the polyester nonwoven geotextile high quality woven bag wrapped gravel pile can effectively improve the strength of the gravel pile and reduce the lateral displacement of the pile. polyester nonwoven geotextile manufacturers can also be used as concrete mold bags and sandbags. The cylindrical geotechnical bag made of polypropylene nonwoven geotextile for sale can be constructed by hydraulic filling to form a coastline embankment.
3. Analysis of the status quo of geotextile application
With the development of society, the expansion of application scope and the improvement of the use function, non-woven polyester nonwoven geotextile wholesale will encounter various use environments in the application process, and the performance requirements of polypropylene nonwoven geotextile wholesale are also higher and higher.
3.1 Anti-seepage engineering
In the fields of landfills, pollutant storage pools, sewage treatment plants, environmental protection, and hydraulic structure anti-seepage, factory price polyester nonwoven geotextile and geomembranes can be combined to achieve their anti-seepage function. However, due to the complexity of the landfill waste, the acidity and alkalinity of the landfill leachate in different areas of the same landfill are not the same. The complex acid-base conditions impose strict requirements on the acid and alkali resistance of the polyester nonwoven geotextile for sale. Based on the long-term consideration of engineering, polypropylene nonwoven geotextile for sale are required to have the characteristics of environmental temperature resistance, corrosion resistance, high strength, good acid, and alkali resistance and good durability.
3.2 High-speed rail ballastless track
In order to block the influence of the telescopic deformation caused by the temperature change on the longitudinal joint track structure, reduce the interaction between the track system and the bridge, and ensure the stability and smoothness of the track structure, the railway passenger line in China has no CRTSII type plate on the bridge. An important part of the 砟 track system – the “two cloths and one film” sliding layer, that is, the lower layer polypropylene nonwoven geotextile wholesale of the two layers of polyester nonwoven geotextile high quality intermediate sandwich 1 layer geomembrane (400g cloth +1.0HDPE film +200g cloth) and the CRTS III type plate type flawless The geostrophic cloth of the track isolation layer has imposed strict requirements. When the polypropylene nonwoven geotextile high quality adheres to the waterproof layer or the beam surface of the beam by the adhesive, the polypropylene nonwoven geotextile for sale should have excellent acid and alkali resistance, corrosion resistance, mildew resistance and wear resistance due to the alkaline of the base concrete slab.
3.3 Fly ash yard project
Fly ash is a waste from power plants and needs to be disposed of during long-term stacking. The pH value of fly ash will increase instantaneously when it meets water, and the pH value will continue to increase with the increase of time. The maximum value is more than 12 and it is strongly alkaline. Therefore, the durability of the polypropylene nonwoven geotextile wholesale is very strict.
3.4 Tailings yard storage project
In order to improve the stability of the tailings dam body and reduce the impact on the surrounding environment, the tailings storage yard should be treated with anti-seepage and reinforcement, while gold, lead, copper, alumina, mercury, cadmium, chromium and The leachate of metal tailings ponds such as molybdenum is basically alkaline, even strong alkaline, and the acid and alkali resistance of polypropylene nonwoven geotextile high quality and composite polyester nonwoven geotextile manufacturers must meet the durability requirements.
3.5 Mine heap leaching project
China’s total mineral resources are abundant, but it has the characteristics of low grade and complicated ore processing. The heap leaching mining technology is the most widely used mining technology in China’s mining and metallurgy industry. However, the leaching solution of the concentrator will cause pollution to groundwater and soil. Destroy the environment. In order to effectively prevent the acid-alkaline leachate from leaking, the selected polyester nonwoven geotextile wholesale must have good acid and alkali resistance.
3.6 Ecological bag slope protection project
The eco bag is a bag made of a high-strength, flat-stabilized needle-punched nonwoven polyester nonwoven geotextile high quality made of polypropylene. The eco-bag has strong corrosion resistance, UV resistance, no degradation, can resist the erosion of insects, and resists aging, acid and alkali salt erosion and microbial decomposition. Its water-permeable and impervious function not only prevents the loss of filler (soil and nutrient mixture) in the bag but also realizes the normal exchange of water in the soil. The water required for plant growth can be effectively maintained and timely replenished factory price polypropylene nonwoven geotextile. Plants can grow freely through the bag body, and the roots enter the engineering foundation soil to form a re-stabilization between the bag body and the soil slope. It is an important construction in the highway railway slope greening protection, barren hill mine restoration, riverbank slope protection, and inland river improvement. One of the methods. In summary, the ecological bag should also have good acid and alkali resistance.
Due to the poor acid and alkali resistance of the current common polyester nonwoven geotextile for sale, the strength and elongation will decrease in an alkaline environment, affecting its performance and durability. High-strength polypropylene filament spunbonded needle-punched polypropylene nonwoven geotextile high quality has high strength, low elongation, strong deformation resistance, low density, simple construction, excellent corrosion resistance, suitable for various acid and alkali environments, no water absorption, water permeability, and conductivity. The characteristics of good water performance have become an important development direction of the polypropylene nonwoven geotextile for sale industry.
4. Geotextile industry development recommendations
According to the “National Medium- and Long-Term Science and Technology Development Plan (2006-2020)”, the Ministry of Science and Technology launched the key project of the national key R&D plan “Key Basic Materials Technology Improvement and Industrialization”, polypropylene nonwoven geotextile manufacturers and proposed the geotechnical materials under the application environment conditions. Research on service behavior and failure mechanism and research on high-strength, anti-aging geotechnical materials.
The purpose of this special project is to improve the technological innovation capability and overall competitiveness of the bulk basic materials industry, and to focus on the development of national major projects and strategic emerging industries, and to focus on product homogeneity and low value faced by key basic materials industries. Major and common problems such as heavy environmental load polypropylene nonwoven geotextile manufacturers, and promote the structural adjustment and industrial upgrading of key raw materials. Through key technologies such as design and development of basic materials, manufacturing processes and process optimization, and key breakthroughs in localized equipment, we will achieve high performance and high added value of key basic materials products, enhance the overall competitiveness of China’s basic materials industry factory price polypropylene nonwoven geotextile, and meet China’s high-end manufacturing industry. The urgent need for the innovation and development of strategic emerging industries provides support for China’s participation in the global new round of industrial transformation and competition and realizes the transformation of China’s material industry from big to strong, material technology from running to running and parallel and leading.
From the perspective of polypropylene nonwoven geotextile high quality production equipment, production technology, and product quality, China’s polyester polypropylene nonwoven geotextile manufacturers have reached the world’s advanced level. However, the production technology and products of high-strength and aging-resistant polyester nonwoven geotextile for sale, which are the main development direction of the industry, have not yet made major breakthroughs in China. In developed countries in Europe and America, high-strength polypropylene filament spunbonded needle-punched factory price polypropylene nonwoven geotextile have accounted for 30% to 40% of the polypropylene nonwoven geotextile manufacturers industry’s output, and some countries have even reached 50%. Foreign production of polypropylene spunbond needle-punched polyester nonwoven geotextile wholesale is well known. The company has POLY FELT, which is located in Malaysia and is affiliated with TEN CATE in the Netherlands. In comparison, China’s high-strength polypropylene filament spunbonded needle-punched polypropylene nonwoven geotextile high quality has lagged behind developed countries.
In recent years, Tiandingfeng Nonwovens Co., Ltd. and Italy’s FARE (Farsi) Co., Ltd. successfully developed high-strength coarse-denier polypropylene spunbonded needle-punched nonwoven factory price polypropylene nonwoven geotextile production technology and has achieved localization, its technology. The index has reached and exceeded the product index of POLY FELT, which has changed the status of the foreign monopoly of the technology and the fact that almost all domestic filament fabrics are PET filament fabrics, ending the history of a long-term dependence on foreign polypropylene spunbonded needle-punched polypropylene nonwoven geotextile high quality in engineering applications in China. It can be predicted that the factory price polypropylene nonwoven geotextile market will continue to grow rapidly in the future, and polypropylene non-woven geotextiles will surely become one of the trend trends in the development of the polyester nonwoven geotextile for sale industry in China.