Geotextile several short wire and filament. GB and non-GB geotextile product quality, conservation non-national standard. Geotextile specifications such as 100 g / m2, price accounted for by weight or ton. Shandong, geotextile manufacturers professional the Taian price is more reasonable. Should shop around and compare a lot. Geotextile divided into two categories of impermeable geotextile filtration geotextile. Impermeable geotextile fabric composed of polyester fibers and impermeable membrane (polyethylene), generally can be divided into a cloth one membrane and two cloth membrane, widely used in the artificial lake, river and landfill. Play a the seepage role. The filtration geotextile can be divided into the filament and staple fiber geotextiles. The former is superior to the latter, is widely used in manufacturing, construction and other industries. The two geotextiles generally in accordance with the number of dollars per square meter. Geotextile is a large family of Geosynthetics, used extensively for roads, railways, water conservancy, large buildings, fly ash dam construction, non-ferrous metals tailings disposal, environmental engineering, water and soil conservation. China's enterprises have hundreds of geotextile production capacity, the total production capacity of over 100,000 tons. With our emphasis on the development of basic industries and government applications of geosynthetics strong proponent of the future, the development of the geosynthetics will be accelerated. It is predicted that in 2005 the use of geotextile may reach 50,000 tons in 2010 to reach 100,000 t. The geotextile material geotextile materials used must not only consider the physical and chemical properties required in the use of the environment, but also pay attention to the cost of the product. Consider the following aspects: the harsh working environment of a good physical and mechanical properties of geotextiles, many cases are soaked in water or shop in a very humid soil, so must have good resistance to hydrolysis and wet performance mechanical properties. 1.2 resistant to ultraviolet radiation, hydrolysis resistant, resistant to high and low temperature geotextile to be exposed to sunlight, and therefore has a corresponding UV resistance; geotextile to adapt to the temperature at the time of contact with the asphalt and other materials requiring a higher melting point. 1.3 chemical resistance, corrosion resistance, resistance to mildew water and soil are very different, some alkaline, some acidic, some salty, some containing a variety of elements, and therefore must have chemical stability. 1.4 Good permeable geotextile filtration and drainage need permeable, and therefore must have good permeability. Geotextile materials they use polymers, which most of polypropylene raw materials (including fiber), which accounts for more than 50% of the total amount of the geotextile, the United States accounted for more than 80%. Polyester raw material (polyester) accounted for 15% -30%, ranking No. 2, Japan more. Less of polyethylene and polyamide fibers, China are used by Villeneuve. Polypropylene raw materials with the most, the price is certainly an important factor, but mainly polypropylene has excellent acid and alkali resistance, corrosion resistance, mildew resistance, from bacterial attack; and better wicking effect, water permeability. Its mechanical properties are also very good, especially in recent years has developed a high-strength polypropylene filament strength of 8g / D, is very suitable for the production of high-strength polypropylene woven geotextile cloth bags. The disadvantage of polypropylene is poor ultraviolet resistance, in particular, is very sensitive to ultraviolet radiation on UVB band, tests showed that the spring and summer of the glass 6 months under illumination, the intensity i.e. reduced to 0, while the polyester is maintained 78%, nylon 73 % polypropylene spinning before must be approved by anti-aging treatment, use and transport must be avoided in the sun. In addition, the melting point of polypropylene is lower (about 135 ℃), the company is the most professional geotextile manufacturers, geotextile mainly divided into two categories, non-woven permeable geotextile and waterproof geotextiles. Therefore, when combined with the the bitumen sealing material and flooring materials, subject to certain restrictions. The polyester mechanical and physical properties, melting point than polypropylene, resistance to ultraviolet radiation also much better than polypropylene geotextile ideal raw material. Polyester has good acid resistance, and also resistant to weak base, but the long-term with an alkaline substance such as lime, cement, concrete, alkaline soil contact is strongly affected by the loss of its hydrolysis resistance is also poor, attention should be used. Nylon, and vinylon good alkali resistance, but poor acid resistance. Polyamide filaments at pH 4,25 ° C buffer solution by 11 months, to 1% strength only polyamide geotextile should not be used in the pH <5 of the soil, or not durable. Vinylon resistance to seawater erosion, suitable for coastal engineering. Different manufacturing method of geotextile Production 2.1 geotextile consumption Figure 1 1985-1995 nonwoven geotextiles and nonwoven geotextiles proportional change in the world situation. As can be seen from Figure 1, the proportion of total geotextile nonwoven geotextiles has reached about 70%, the nonwoven geotextiles about 30%. The higher proportion of non-woven geotextile, nonwoven geotextiles 1990: woven geotextile: knitted geotextiles proportion of 70:28:2 1995 85:14:1. United States in 1992 had the geotextile market analysis (Figure 2): staple, acupuncture, flat-woven and spunbond acupuncture cloth Habitat geotextile usage 1,2,3 and three sum total U.S. geotextile 95.7% of the total cloth. Of course, the current structure had changed considerably. China is still no exact statistics, but in general the dominant staple acupuncture geotextile nonwoven geotextiles and PP Flat Yarn, both the share of 85% -90%. Acupuncture geotextile spunbond filaments actual output in 1998 will not be more than 15 million m2, about 3000t, accounting for about 10%, monofilament and multifilament filament woven geotextile in small quantities. 2.2 nonwoven geotextiles woven geotextile geotextiles including monofilament, multifilament, cut film wire, film crack silk as raw material. The woven geotextile main features: - tensile strength and initial modulus, elongation at break and creep. Figure 3 is a comparison of woven geotextiles and the nonwoven geotextiles load - elongation curve. - Rely on the warp and weft squeeze each other to maintain structural stability. - Mechanical properties of water, is flat-woven geotextile filter, pore size, minimum 0.05-0.08mm for filtration, small gravel propensity to churn. Flat yarn woven fabric is also prone to clogging. Monofilament fabrics are less prone to clogging, suitable for non-cohesive soil filter layer. - Small thickness, horizontal drainage is poor, and should not be used as a drainage material. - Elastic elongation is small, easy to pierce hard material contact, bursting, affecting the filtration function. - Complex production process, low yield and high cost.