The warp-knitted composite geomembrane is a new type of geotextile made of glass fiber (or synthetic fiber) as an improved material and short fiber needle punched nonwoven fabric as raw material.
The warp-knitted composite geomembrane is different from general woven fabrics. Its biggest feature is that the intersection of latitude and longitude is not curved, and each is in a straight line. The two are closely combined with rolling wire, which can fully balance the synchronism, bear external force, and diversify stress. When the external force is released to tear the material, the yarn will gather along the initial crack to increase the tear strength. When the warp knitting is combined, the warp knitting combined thread is repeatedly inserted into the fiber layer of the warp, weft and short fiber needle geotextile to knit the three into one.
Therefore, the warp-knitted composite geotextile has not only the characteristics of high tensile strength and low elongation, but also the characteristics of needle punched nonwoven fabric. Therefore, warp knitting geotextile is a kind of geotextile that can be used for reinforcement, isolation and protection. It has excellent water accumulation and different water-locking effects in the vertical and horizontal directions of the three-dimensional whole. Because its solid matrix and pores are in the continuous phase, it becomes a porous filtration effect, which is a kind of multifunctional geotechnical composite material. It is a class of advanced geosynthetic substrates in the contemporary world.
Impermeable geotextile is a geotextile impermeable material composed of a plastic film as a waterproof base material and a non-woven fabric. Its waterproof characteristics are mainly due to the waterproof characteristics of the plastic film. At this stage, the plastic films used for waterproofing in various countries around the world are mainly polyvinyl chloride (PVC) and polyethylene (PE), which are flexible polymer chemical materials with small proportion, strong extensibility and strong deformation applicability. Good corrosion resistance, low temperature resistance and frost resistance.
The main mechanism of the anti-seepage geotextile is to isolate the leakage channel of the earth dam with the anti-seepage property of the plastic film, with its great tensile strength and elongation to bear the water pressure and the deformation of the applicable dam. Non-woven fabrics are also a class of high molecular short fiber chemical materials. It has high tensile strength and extensibility according to needle punching or thermal bonding. When combined with plastic film, it not only improves the tensile strength and puncture resistance of the plastic film, but also improves the friction coefficient of the contact surface due to the rough surface of the non-woven fabric, which is beneficial to the stability of the composite geomembrane and protective layer. At the same time, they have excellent resistance to bacteria and chemical corrosion and are not afraid of acids, alkalis and salts.
