strandsoften

Strandsoften is a term used in textile engineering and polymer science to describe a class of finishing and conditioning methods intended to increase the flexibility, drape, and tactile feel of strands, fibers, and yarns. The concept encompasses chemical, physical, and coating-based approaches applied to single filaments or to yarn assemblies prior to weaving, knitting, or composite fabrication.

The term is a portmanteau of strand and soften and is not a standardized industry term. In available sources, strandsoften is applied variably across sectors, sometimes referring to surface lubricants, chemical plasticizers, or moisture-assisted thermal treatments designed to reduce stiffness.

Techniques used under strandsoften include chemical plasticization with compatible additives to increase chain mobility; surface coatings that impart lubricity or a soft hand; moisture and heat treatments that promote relaxation of the polymer network; and plasma- or corona-assisted surface modification to improve finish uptake and durability. Some implementations combine several steps in a single processing sequence.

Applications include apparel fabrics requiring improved hand and drape, such as knits and activewear; technical textiles used for filtration, geotextiles, or automotive interiors; and prepregs or filament yarns destined for composite manufacturing. Benefits can include enhanced handle, reduced processing noise, and easier handling. Potential drawbacks include partial loss of tensile strength or yarn cohesion, migration of softeners, and reduced wash/durability if the additives are not well bound or compatible with the matrix.

See also: plasticization, textile finishing, fiber finishing, surface modification.