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  

PP Non Woven Geotextile  

Polyester Continuous Filament Non Woven Geotextile 

1.Introduction

PP staple fiber needle punched non woven geotextile is a popular geosynthetic material,it is made by using an advanced needled nonwoven geotetxile fabric production line to cross-lay polypropylene fibers and then reinforce them with needling.The weight range is from 80g/m2 to 1000g/m2.This product has uniform thickness and good isolation effect, and is suitable for various geotechnical projects such as highways, railways, and tunnels… 

2.PP Staple Fiber Non Woven Geotextile Features

*Polypropylene fibers have a low density of only 0.91g/cm ³(polyester is 1.38g/cm ³).Therefore,compared with polyester non woven geotextiles, polypropylene non woven geotextiles have a larger coverage area under the same strength

*The special structure of polypropylene fiber endows it with excellent acid and alkali resistance,especially superior alkali resistance to polyester fiber.When used in underground projects such as protection, reinforcement, waterproofing and anti-seepage in soil with strong acidity and alkalinity, its effect is better than that of polyester

*The surface friction coefficient of polypropylene fibers is relatively small, the friction force between fibers is small, and it has good wear resistance. Its seismic dynamic friction performance is much better than that of polyester

*Polypropylene fibers have excellent hydrophobicity and do not absorb water,making them superior to polyester fibers in drainage engineering applications

*High performance polypropylene non woven geotextiles have more fibers and higher strength than polyester non woven geotextiles of the same weight, and their strength in both longitudinal and transverse directions is almost the same

3.PP Staple Fiber Non Woven Geotextile Applications

*Transportation

High performance polypropylene nonwoven geotextiles have very wide applications in the transportation field, such as reinforcing,isolating and filtering the subgrade of highways and railways, sliding layers and isolation layers of high-speed railway ballastless tracks, reinforcing layers of airport aprons and runways, and reinforcing layers of seaport slope protection, etc. Transportation engineering is a major consumer of cement. At the parts that come into direct contact with numerous cement structures, high strength polypropylene non woven geotextile fabric has excellent alkali resistance, which can effectively ensure that its physical properties do not decrease due to the alkalinity of cement and play a long term role in the project

*Water conservancy

High performance polypropylene non woven geotextiles are suitable for any water conservancy project. They can be used alone to reinforce and protect reservoir DAMS, river, lake and sea embankments, etc., and can also be combined with geomembranes to form composite geomembranes for anti-seepage in water conservancy projects.However, in the project of reinforcing and preventing seepage in combination with cement, high performance polypropylene non woven geotextiles must be used. The alkalinity of cement can dissolve polyester non woven geotextiles within half a year,causing huge losses to the project and even leading to the loss of life and property

*Environmental protection

In environmental protection projects, many are under alkaline conditions and high performance polypropylene nonwoven geotextiles must be used. For instance, tailings DAMS and heap leaching sites for various metal beneficiations (such as gold, silver, copper, aluminum, magnesium, lead, zinc, etc.), landfill sites, special landfill sites, fly ash landfill sites, ash dam pools, heap leaching sites, red mud storage facilities, etc., are all in acidic or alkaline conditions

Keywords：
PET Non Woven Geotextile,PP Non Woven Geotextile  ,Polyester Continuous Filament Non Woven Geotextile  

What’s Steel Plastic Composite Geogrid?

Lianyi® Steel-plastic composite geogrid is made by specially treating high strength steel wires, combining them with polyethylene and adding other additives, and extruding them to form composite high-strength tensile strips,and the surface has a rough texture, it is called a high strength reinforced geogrid. This single band is woven or interlaced at certain intervals in the longitudinal and transverse directions and welded by ultrasonic waves. Due to the product surface being rolled into regular patterns, when laid in the replacement fill soil layer, it bears huge stress resistance and friction with the fill soil. As a whole, it limits the shearing, side extrusion and uplift of the foundation soil. Because the stiffness of the reinforced soil cushion layer is relatively large, it is conducive to the diffusion and more uniform transmission of the upper foundation load to the lower soft soil layer, effectively improving the bearing capacity of the foundation Due to the effect of the reinforced soil cushion layer, the overall stiffness of the foundation within the compression layer range is increased, which is conducive to adjusting the deformation of the foundation. The reinforced soil composite cushion layer formed by using steel plastic composite geogrid is a flexible structure that can absorb the energy of earthquakes very well, so its seismic performance is good.

Steel Plastic Composite Geogrid Features

*It has high strength and low creep,and is suitable for various soil environments.It can be used in tall retaining walls along highways

*It has stable performance,can enhance the interlocking and biting effect of the reinforced bearing surface,strengthen the bearing capacity of the foundation, restrain the lateral displacement of the soil, and increase the stability of the foundation

*It is not easy to be damaged.After the packing is compacted,it is not eroded by ultraviolet light and oxygen,and can meet the requirements of engineering construction

*Corrosion-resistant and long-lasting,steel plastic composite geogrids use plastic materials as the protective layer and are supplemented with various additives to endow them with anti-aging and anti-oxidation properties, and can withstand the corrosion of harsh environments such as acids, alkalis, and salts. Therefore,steel plastic composite geogrids can meet the usage requirements of various permanent projects for over 100 years,and they have excellent performance and good dimensional stability

*The construction is convenient, the cycle is short,and the cost is low.The laying, lapping and positioning of steel plastic composite geogrids are easy, avoiding overlapping and crossing,which can effectively shorten the project cycle and save 10% to 50% of the project cost

*All types support customization.We can customize suitable products according to your needs

Steel Plastic Composite Geogrid Applications

It can be applied to the reinforcement of soft soil foundations,retaining walls and anti-cracking projects of road surfaces in fields such as highways, railways, embankments, abutments, approach roads, docks,revetments,flood control embankments, DAMS, waste dumps, freight yards, airports, sports fields and environmental protection buildings.

Keywords：
PET Welded Geogrid  

PP Welded Geogrid  

HDPE GeomembraneConstruction precautions

*The soil should be solid to avoid uneven settlement and cracks. The turf and tree roots within the anti-seepage range should be removed. A protective layer of fine grained sand or clay is laid on the surface in contact with the membrane

*When laying the geomembrane,do not pull it too tightly.It is better for the parts buried in the soil at both ends to be in a wavy shape. Especially when anchoring with rigid materials, a certain amount of expansion and contraction should be left

*During construction,it is necessary to avoid direct impact of stones and heavy objects on the geomembrane.It is best to lay the membrane and cover the protective layer simultaneously during construction

*Construction workers should wear flat cloth shoes or soft rubber shoes. It is strictly forbidden to wear spiked shoes to avoid damaging the geomembrane. If any damage to the geomembrane is found during construction, it should be repaired in time

Seam

1.The laying of geomembrane

*The surface of the geomembrane should be cleaned and laid as a whole, without any unevenness or concavity.There should be no sharp objects such as stones, iron wires or wooden sticks. Herbicides should be sprayed to kill weeds

*Geomembrane is best laid in a certain direction and should not be stretched too tightly. There should be a certain margin to accommodate the overall deformation

*A certain width of PE film and PE film adhesive layer should be reserved on both sides of the geomembrane. When laying, the direction of each unit of geomembrane should be adjusted properly to facilitate the welding of two units of geomembrane

*After the geomembrane is laid, it should be pressed down with sand belts to prevent wind movement, which may affect the welding of the edge of the geomembrane in the next step, and the cushion layer should be covered in time

2. Welding of geomembrane

*For the laid geomembrane, there should be no dirt, moisture, dust, etc. at the edge seams

*Before welding, adjust the two edges of the PE single film at the joint to overlap to a certain width, and make it flat without wrinkles

*During welding, technicians are responsible for the welding or technical guidance, and professional double-track automatic crawling welding machines are used for the welding

*When welding, control the pressure, temperature and forward speed of the heat sealing machine well to ensure the welding quality

*After welding is completed, timely inspection should be carried out to ensure the integrity of the weld seam. Welding should be done immediately after laying, which increases the difficulty of cleaning over time.

Keywords：
Geomembrane   

HDPE Geomembrane   

Composite Geomembrane  

What’s HDPE Geomembrane?  

Lianyi® HDPE Geomembrane is a new type of geosynthetic material,It is made of high-quality virgin polyethylene resin, with the main component being 98% high-density polyethylene, approximately 2% carbon black, anti-aging agents, antioxidants, ultraviolet absorbers, stabilizers and other auxiliary materials. It is produced by the most advanced fully automatic production equipment in the world through three-layer co-extrusion technology. All products are manufactured in accordance with GM13 standards and ASTM testing standards. They come in a complete range of specifications, with smooth surface thickness ranging from 0.2mm to 3.0mm and width from 2 to 8m, meeting the application requirements of water conservancy, construction, municipal engineering, gardens, landscapes, petrochemicals, mining, agriculture, aquaculture and other industries.

Features Of HDPE Geomembrane

*High anti-seepage coefficient 

HDPE geomembrane has an anti-seepage effect that is unmatched by ordinary waterproof materials. The water vapor permeability system is k≤1.0*10-13g.cm/cm2.s.pa

*Chemical stability

HDPE geomembrane has excellent chemical stability and is widely used in sewage treatment, chemical reaction tanks and landfill sites. It is resistant to high and low temperatures, asphalt, oil, tar, and over 80 kinds of strong acid and strong alkali chemical media such as acids, alkalis and salts

*Aging resistance

HDPE geomembrane has excellent anti-aging, anti-ultraviolet and anti-decomposition capabilities. It can be used exposed and has a service life of up to 50 to 70 years, providing a good material guarantee for environmental anti-seepage

*Resistant to plant roots

HDPE geomembrane has excellent puncture resistance and can resist the roots of most plants

*High mechanical strength

HDPE geomembrane has excellent mechanical strength, superior elasticity and deformation capacity, making it highly suitable for expanding or contracting base surfaces. It can effectively overcome uneven settlement of the base surface. The tensile strength at break is 28 mpa, and the elongation at break is 700%

*Good economic efficiency

HDPE geomembrane has enhanced its anti-seepage effect by adopting new technologies. However, its production process is more scientific and rapid, and the product cost is lower than that of traditional waterproof materials. According to actual measurements, projects using HDPE geomembrane can save about 50% of the cost

*Fast construction speed

HDPE geomembrane has high flexibility and is available in various specifications and laying methods to meet the anti-seepage requirements of different projects. It is welded by hot melt, featuring high welding strength, convenient and fast construction

*Environmentally friendly and non-toxic

The materials used in HDPE geomembrane are all non-toxic and environmentally friendly. The anti-seepage principle is a common physical change, which does not produce any harmful substances. It is the best choice for environmental protection, aquaculture and drinking water pools

Applications Of HDPE Geomembrane 

*Environmental protection and sanitation (such as domestic waste landfills, sewage treatment plants, power plant regulating tanks, industrial and hospital solid waste, etc.)

*Water conservancy (such as anti-seepage, leakage plugging, reinforcement of river, lake and reservoir DAMS, anti-seepage of water channels, vertical core walls, slope protection, etc.)

*Municipal engineering (subways, underground works of buildings, green roofs, anti-seepage of roof gardens, inner linings of sewage pipes, etc.)

*Gardens (artificial lakes, rivers, reservoirs, bottom linings of ponds for golf courses, slope protection, waterproofing and moisture-proofing of green lawns, etc.)

*Petrochemical (Anti-seepage of storage tanks in chemical plants, oil refineries, gas stations, inner linings of chemical reaction tanks, sedimentation tanks, etc.)

*Mining (washing and selection tanks, heap leaching fields, ash storage fields, dissolution tanks, sedimentation tanks, storage fields, bottom lining and anti-seepage of tailings, etc.)

*Transportation facilities (foundation reinforcement of highways, subways, anti-seepage of culverts)

*Agriculture (Channels, diversion channels, reservoirs, drinking water pools, storage ponds, anti-seepage of irrigation systems)

*Aquaculture industry (intensive, factory-scale aquaculture ponds, fish ponds, shrimp ponds lining, sea cucumber circle slope protection, etc.)

*Salt industry (salt field crystallization pool, salt film, salt pool plastic film)

Keywords：
Geomembrane   

HDPE Geomembrane   

Composite Geomembrane