Usually the price of multifunction film is 11,600 yuan / ton; multi-functional anti-fogging film is about 13,000 yuan / ton, EVA is about 14,400 yuan / ton.
The unit price of geomembrane is about 5 yuan. Composite geomembrane is a kind of geotechnique impermeable material taking plastic film as impervious substrate and compositing with non-woven geotextile. Its anti-seepage property mainly depends on the anti-seepage property of plastic film. Plastic film used for seepage-proofing at home and abroad mainly include polyvinyl chloride (PVC) and polyethylene (PE), EVA (ethylene / vinyl acetate copolymer), which are a kind of high polymer chemistry flexible material, with small proportion, strong extensibility, high?adaptability?to the?deformation, corrosion resistance, low temperature resistance and good anti-frost property. The service life period of geomembrane mainly depends on whether the plastic film has lost anti-seepage and water-proof function, according to the Soviet national standard, the thickness for water conservancy project is 0.2m polyethylene film with stabilizer. Its service life period can be up to 40 ~50 years under clean water conditions, and 30~40 years under waste water conditions. Therefore, the service life period of geomembrane is sufficient to meet the service life period required by dam seepage-proofing.
The material for geomembrane production is high density polyethylene, refined from petroleum, whose price depends on the international crude oil prices. Currently, the price trend is stable and there is no big change in price. About 3 yuan / piece. Geomembrane construction site the main mechanism is to cut off earth dam leakage passage by using the imperviousness of plastic film, bearing hydraulic?pressure and adapt to dam deformation with its greater tensile strength and ductility; non-woven fabric is also a kind of polymer short fiber chemical material, through needle punching or hot sticking forming, with high tensile strength and extensibility. After it is combined with plastic film, it not only increases the tensile strength and puncture resistance of plastic film but also because of the roughness of woven surface, increases the friction coefficient of the contact surface, which is conducive to the stability of geomembrane and protective layer. At the same time, they have good errosion resistance to bacteria and chemical action, not afraid of acid, alkali and salt erosion. It is used in dark places with long service life.
