Staple Needle Punctured Non-woven Geotextile

The staple needle punctured non-woven geotextile adopts the mechanical entanglement staple fiber needle-punching process. The specific process flow is as follows.

• 1. Fiber Preparation: Primarily using polyester (PET) or polypropylene (PP) as the main raw material, these polymers are melted, spun, and cut into staple fibers.
• 2. Opening and Carding: The staple fibers are dispersed in an opener and then combed into a web (fiber web) with random directions but uniform thickness.
• 3. Needle-Punching: This is the most critical step. Driven by a needle-punching machine, thousands of barbed needles repeatedly pierce the web. The barbs of the needles drive some fibers downward, causing them to interweave, entangle, and connect.
• 4. Reinforcement and Forming: After countless needling cycles, the originally loose fiber web is transformed into a tightly structured, cloth-like material with a certain thickness, strength, and toughness.
• 5. Finishing: Depending on the needs, singeing, calendering, and impregnation may be performed to modify the surface characteristics or enhance certain properties (such as filtration accuracy).

• 1. Isolation: Prevents soil layers with different characteristics (such as roadbed and soft foundation) from mixing, maintaining the structural integrity of each.
• 2. Filtration: Allows water to flow smoothly from fine-grained soil to coarse-grained soil, effectively preventing excessive loss of fine soil particles and preventing pipe bursts.
• 3. Drainage: Utilizing its three-dimensional pore structure, it forms drainage channels within the soil, collecting and discharging excess liquid or gas.
• 4. Reinforcement: Distributes loads, improves the tensile and shear strength of the soil, and enhances the stability of soft foundations.
• 5. Protection: Serves as a cushion layer to prevent other anti-seepage materials (such as geomembranes) from being punctured by sharp objects.

Due to its versatility and cost-effectiveness, staple needle punctured non-woven geotextile are widely used in the following engineering scenarios:

1. Highway and Railway Engineering

• Application: Used as an isolation layer between the roadbed and soft subgrade, preventing rock subsidence and soil upwelling, maintaining roadbed thickness and bearing capacity, and extending road life.
• Function: Isolation, reinforcement, and drainage.

2. Water Conservancy Projects (Embankments, River Channels)

• Application:
  • Filter Layer: Used on the backwater side of earth-rock dams, riverbanks, and slope protection as a filter layer to prevent soil erosion and ensure the smooth drainage of seepage water.
  • Slope Protection Underlay: Laid beneath the paving stones or concrete slabs to prevent the base soil from being washed away by water.
• Function: Filtration, drainage, and protection.

3. Environmental Protection Projects (Landfills)

• Application:
  • Base Layer: Laid on the bottom and slopes of landfills, it serves as a protective layer for the geomembrane to prevent punctures. Leachate Collection and Drainage Layer: Used in conjunction with drainage nets to filter and drain leachate generated by landfill.
  • Cover System: Serves as a drainage and reinforcement layer within the final cover layer.
• Functions: Protection, filtration, and drainage.

4. Municipal and Construction Engineering

• Application: Used in underground drainage systems, roof garden drainage, foundation treatment, and other applications, providing filtration and drainage.

5. Agriculture and Gardening

• Application: Used in farmland drainage ditches, orchard weed control sheets, and Geotextile bag, achieving water permeability and soil conservation.