The composite geomembrane is composed of filaments or staple fibers, which are laid into a net according to different machines and processing techniques. After acupuncture and other technological processes, different fibers are interwoven, entangled, and fixed to normalize the textile, making the fabric soft, full, thick, and straight, reaching the application standard of different thickness. Non-woven geotextile has excellent textile gap and adhesion. Because the fiber is soft, it has corresponding tear resistance and excellent deformation adaptability. At the same time, it has excellent flat drainage level, soft surface with multiple gaps and excellent friction coefficient, which can improve the adhesion level of soil particles, etc. According to avoiding particles and removing excess water to avoid the loss of fine particles, it has a soft surface Excellent protection level. According to the total length of the yarn, it can be divided into filament nonwoven geotextile or staple filament nonwoven geotextile. They have excellent filtering, isolation, reinforcement, protection and other functions, and are widely used in geosynthetics. The tensile strength of the filament is higher than that of the short filament, and the short filament can be selected according to the actual standard.
The composite geomembrane is made of plastic film as impervious material and is covered with non-woven fabric. The key to its anti-seepage property lies in the anti-seepage property of the plastic film. At this stage, the key plastic membranes used for anti-seepage at home and abroad are polyvinyl chloride (PVC) and polyethylene (PE), which are all flexible polymer chemical materials with small specific gravity, strong ductility, and strong adaptability to deformation. Good corrosion resistance, low temperature resistance and cold resistance. The key principle is to isolate the leakage channel of the earth dam with the impermeability of the plastic film, and withstand the water pressure and adapt to the deformation of the dam with its relatively large tensile strength and elongation. Non-woven fabric is also a kind of polymer short fiber chemical material. It has high tensile strength and ductility based on needle punching or hot 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 nonwoven 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.
