Nonwoven Composite Structures

Multi-layer nonwoven composites combining advantages: SMS (Spunbond-Meltblown-Spunbond)—most common, outer spunbond strength (50-100 N/5cm) + meltblown barrier (<5 μm pores), total 40-60 GSM, medical protective apparel market standard. SMMS (Spunbond-Meltblown-Meltblown-Spunbond)—double meltblown layers improving barrier (two independent barriers reducing pinhole probability), used in critical medical applications (surgical gowns OR-rated), 50-70 GSM. Laminated structures—adhesive or thermal bonding of dissimilar nonwovens (spunbond + film for waterproof-breathable, needlepunch + spunbond for strength + softness), enabling property combinations impossible in single layer. Elastic composites—elastane (spandex) film or nonwoven sandwiched between nonwoven layers, heat activated creating stretch fabrics (elastic waistbands, diaper side panels, stretch hygiene products), achieving 100-300% stretch with >90% recovery. Absorbent composites—airlaid core (superabsorbent polymer + pulp) between spunbond/SMS layers (fluid acquisition, distribution, and barrier), used in baby diapers (acquiring 200-400g urine, locking in SAP preventing rewet), feminine hygiene products. Conductive nonwovens—carbon fibers or conductive polymers in web, applications in EMI shielding, antistatic, heating elements, sensors integrated in nonwoven structures. Design philosophy: each layer optimized for specific function, integration via bonding methods achieving synergistic properties (strength + barrier + softness + elasticity) in single fabric.