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1.Introduction
Polypropylene continuous filament needle punched non woven geotextile is an important geosynthetic material. We adopt advanced spinning technology. The maximum fiber weight of the geotextile can reach 11D, which is 3 to 4 times the fineness of traditional spinning technology. When the single filament strength exceeds 3.5g/D, it is called high-strength coarse dener fiber. This kind of fiber has higher strength and modulus, and after needling and consolidation, it can form a stable three-dimensional void structure.Therefore, high-strength coarse-denser polypropylene filament needled non woven geotextile exhibits excellent mechanical properties, and at the same time, it has excellent water permeability and water conductivity, with moderate voids and is not prone to clogging. It is an excellent geosynthetic material.
2.PP Filament Geotextile Features
*Light in weight
The density of polypropylene is only 0.91g/cm ³(that of polyester is 1.38g/cm ³), so compared with polyester non woven geotextile, polypropylene non woven geotextile has a larger coverage area under the same strength and the same mass of geotextile
*Good chemical stability
It has excellent acid and alkali resistance, especially alkali resistance due to polyester. Polyester non woven geotextiles are prone to irreversible hydrolysis under alkaline conditions or in the presence of a large amount of water, which can lead to a decline or even complete loss of material performance. They are particularly unsuitable for areas where alkaline interfaces such as cement, lime, and saline-alkali land come into direct contact.In contrast,polypropylene non woven geotextiles are fully suitable for the above-mentioned environments and will not cause pollution to the environment
*High mechanical properties
Polypropylene filament needle punched non woven geotextile is formed by the consolidation of continuous polypropylene filaments.The tensile fracture of the fabric surface is mainly the fracture of fibers.The mechanical properties such as strength and elongation of polypropylene filament needle punched non woven geotextile are superior to those of short fiber non woven geotextile
*Good drainage performance
It has good hydrophobicity, but also has a good water-conducting effect.In drainage projects,due to polyester
*Good filtering effect
Polypropylene non woven geotextile can achieve the combination of polypropylene nonwoven fabrics with different deniers to form a double-layer filter, which has a better filtering effect
*Convenient for construction
Polypropylene filament needle punched non woven geotextile has a low needling density, a soft surface that is not stiff, and is more in line with the applicable surface, making it more convenient to lay and install
3.PP Filament Geotextile Advantages
*High modulus and high elongation
Polypropylene filament needle punched non woven geotextile utilizes the advanced spunbond needling process to form a unique three-dimensional structure of continuous polypropylene filaments,demonstrating excellent tensile strength, tear resistance, and puncture resistance
*Resistant to acid and alkali
The pH range of 2 to 13 has almost no impact on performance.It can be in long-term contact with alkaline materials such as cement,fly ash and lime,and can maintain stable performance in complex usage environments such as landfill sites, solid waste landfill sites and saline soil without hydrolysis
*Three-dimensional structure
The fineness range of the single filament is 4D-11D,which is 2 to 3 times that of the polyester geotextile fiber.It can form a stable and uniform three-dimensional pore structure,has excellent water permeability and good anti-clogging property
*Excellent weather resistance
High-altitude frozen soil and high-temperature and high-humidity climate environments have almost no impact on the performance of polypropylene filament non woven geotextiles
4.PP Filament Geotextile Applications
*Run to the isolation level at the airport
The airport runway isolation layer is laid between the base layer and the surface layer of the pavement. It is mainly used to improve the interlayer action state, prevent reflective cracks and various interlayer damages, improve the load distribution, and extend the service life of the runway
*Highway waterproof and crack-proof base fabric
Polypropylene filament needle punched non woven geotextile is used for crack prevention in major highway repairs and new highway projects.It forms a waterproof and crack-proof layer with the hot asphalt adhesive layer, effectively reducing the occurrence and development of reflective cracks in semi-rigid base layers
*Isolation layer for high-speed railway ballastless track
The isolation layer of high-speed railway ballastless track is laid between self-compacting concrete and the base plate, which is used to reduce the impact of temperature changes, concrete shrinkage and bridge deflection deformation on the track structure, and at the same time has a certain buffering effect, providing convenience for the maintenance of the track structure. Polypropylene filament needle punched non woven geotextile with acid and alkali resistance, high strength and good elastic recovery is the best choice
*Tunnel anti-seepage lining layer
The waterproof lining layer of the tunnel is located between the initial cement concrete of the tunnel and the waterproof board, and is used to protect the waterproof board and filter impurities to prevent the drainage system from being blocked. The geotextile used for tunnel waterproof lining is in long-term contact with alkaline cement. Polypropylene filament non woven geotextile has a natural advantage
*Bank and bottom protection for water conservancy projects
River ecological bank and bottom protection projects involve laying polypropylene long fiber needle punched non woven geotextiles on the surface of river channels and earth and rock DAMS, and covering them with crushed stones, gabion nets, etc.This not only maintains the ecological balance of river channels but also effectively reduces soil erosion.This method is economical and efficient, and can reduce the amount of engineering crushed stone and earthwork operations
Keywords：
PET Non Woven Geotextile