Structural Splitting
Microstructural peeling along the longitudinal axis of regenerated cellulosic or synthetic fibers constitutes a physical transformation during wet abrasive processing. In fabric manufacturing, filament fibrillation describes the detachment of sub-micron fibrils from the main fiber body when subject to mechanical action in a wet, swollen state. This structural change alters both the tactile hand and optical reflectance of woven or knitted goods.
Processing Mechanism
High crystalline orientation coupled with weak lateral hydrogen bonding causes Lyocell and similar cellulosic fibers to swell significantly in water. Mechanical agitation during jet dyeing forces wet yarns against machine surfaces, driving micro-fibrils to rupture and peel away from the primary fiber shaft. Controlled filament fibrillation generates a soft peach-skin surface aesthetic, whereas uncontrolled fibrillar detachment leads to surface haziness, random pilling, and uneven dye pickup.
Mill processors manage enzymatic treatments using cellulase enzymes to polish off excess micro-fibrils and stabilize fabric appearance.
Quantitative Evaluation
Quality inspection assesses surface disruption using standardized gray scale ratings and digital image analysis under polarized light microscopy. Technicians measure fibril length distribution and count detached micro-fibrils per unit area following standardized laundering cycles. Mill specifications establish target fibrillation index values for commercial fabric batches.
Processing Boundary
Mechanical agitation induces fibrillar detachment primarily in highly oriented cellulosic fibers when wet. Filament fibrillation does not occur in synthetic fibers possessing high lateral intermolecular bonding or un-oriented amorphous polymers.
