Structural Definition
Polymeric carbohydrate molecules forming the structural cell walls of plants comprise the foundational raw material for natural and regenerated textiles. Commercial spinning operations classify cellulosic fibre according to seed hair, bast, or regenerated plant pulp origin. Chemical structure features repeated beta-D-glucose units joined by ether linkages, providing high thermal stability and hydrophilic properties.
Industrial processing converts raw cotton, flax, or wood pulp into spun yarn or nonwoven webs.
Processing Behaviour
Alkaline scouring removes natural waxes and pectin from cotton lumens without degrading the primary cellulose chain. Regenerated variants such as viscose and lyocell undergo chemical dissolution before wet or dry-jet wet spinning into continuous filaments. Tensile strength increases when wet in native plant fibers, whereas regenerated forms experience strength loss upon hydration.
Reactive dyeing mechanisms form covalent bonds with hydroxyl groups along the polymer backbone.
Moisture Dynamics
Standard atmospheric regain ranges from eight percent in cotton to thirteen percent in regenerated viscose. Internal hydroxyl groups absorb moisture vapor directly into non-crystalline amorphous regions of the fiber matrix. Swelling across the fiber diameter alters fabric dimensional stability during laundering.
Commercial Grading
Staple length, micronaire value, and color grade determine commercial valuation at cotton gins and trading houses. High-volume instrument testing measures fiber length uniformity and bundle strength.