Mechanical Bonding: Needlepunch and Hydroentanglement

Needlepunch—barbed needles (felting needles with 6-12 barbs) mechanically entangling fibers via vertical reciprocating motion (800-2,000 strokes/min), creating mechanically bonded nonwoven without adhesives. Process: web fed between stripper and bed plates, needle board punching through web (penetration depth 8-20 mm), barbs catching and pulling fibers creating 3D entanglement and densification. Parameters: punch density (50-500 punches/cm²), needle gauge (6-8 needles/cm on needle board), penetration depth, and web weight (input 50-200 GSM achieving 200-800 GSM after needling via densification). Properties: high strength (tensile 200-800 N/5cm), excellent dimensional stability, good permeability, moderate softness. Applications: geotextiles (40% of needlepunch), automotive carpets and insulation, filtration, furniture padding, roofing underlayment, speeds 20-100 m/min. Hydroentanglement/Spunlace—high-pressure water jets (50-250 bar) through fine orifices (50-150 μm) entangling fibers, creating soft, drapable, absorbent fabrics without chemical bonding. Process: web supported on moving screen/drum, water jets from multiple manifolds (typically 3-6 injection stages) progressively entangling fibers, water filtered and recirculated. Properties: soft hand, high absorbency, good strength (tensile 50-150 N/5cm), drape, aesthetics approaching woven fabrics. Applications: wipes (baby wipes, cleaning wipes—60% of spunlace), medical textiles (surgical gowns, drapes), hygiene products, speeds 50-400 m/min, 15-150 GSM typical.