spunbond

Spunbond is a nonwoven fabric produced by the spunbond process. In this process, thermoplastic polymer melt—most commonly polypropylene, and less often polyester or blends—is extruded through a spinneret to form continuous filaments. The filaments are drawn to align and thin, then deposited as a random web on a moving belt. The web is bonded to provide strength, usually through thermal calendering or point bonding; through-air bonding methods are also used. The resulting fabric is lightweight, strong for its weight, and highly breathable.

Materials and properties: Spunbond fabrics are typically made from polypropylene, though other polymers such as PET may be used. They exhibit good chemical resistance, abrasion resistance, and moisture vapor transmission. The fabrics are available in a range of basis weights, commonly from low to moderate grams per square meter, and can be treated or laminated for additional performance (e.g., hydrophobic or hydrophilic finishes, flame retardants, or adhesion to coatings).

Applications: Spunbond fabrics are widely used in disposable products and industrial materials. Key applications include medical gowns, drapes, and face masks; disposable wipes and hygiene products such as diapers; filtration media; geotextiles for soil stabilization and drainage; agricultural mulches; and various packaging components. In protective apparel, spunbond often forms the outer or inner layers in combination with meltblown layers (as SMS structures) to balance filtration with strength and comfort.

Comparison: Spunbond fibers are coarser and stronger per unit weight than meltblown fibers, making spunbond a preferred layer for strength and durability in many nonwoven assemblies.