Fuzz/Fuzzing

Tiny burrs, broken fibrils or fuzzing appear on the fiber surface, and shimmering micro-fuzz points on the yarn surface can be seen under darkroom light inspection. Fuzz affects the processing performance of subsequent processes — during weaving, fuzz bundles at the needle eyes and increases the breakage rate; during knitting, fuzz produces fabric surface defects. The root cause of fuzz is mostly excessive friction between fibers or rough yarn guide surfaces causing fibrils to peel off.

1. Comprehensive factor: insufficient or uneven oiling causes excessive friction between fibers. 2. Equipment factor: the winding yarn guides or guide discs have burrs or wear. 3. Comprehensive factor: unstable drawing point causes local over-drawing of the fiber. 4. Material/formulation factor: poor emulsification of the oil agent or presence of precipitates. 5. Spinning temperature factor: the spinning temperature determines the melt viscosity and rheological behavior, directly affecting the spinnability, thickness uniformity and surface quality of the fiber. Excessively high temperature leads to degradation, yellowing and filament breakage, while excessively low temperature leads to poor plasticization and increased extrusion pressure; it needs to be precisely set according to the chip IV value and stably controlled.

1. Process parameter optimization and adjustment: ensure sufficient and uniform oiling. 2. Mold/tooling improvement and maintenance: regularly check the smooth condition of the yarn guides and roller surfaces. 3. Equipment inspection and system maintenance: stabilize the drawing point control. 4. Material/formulation optimization: regularly filter or replace the oil agent with new one. 6. Preventive management: establish standardized process parameter cards and quality control limits for each mold/product, and regularly conduct process capability index (CPK) evaluations. For recurring problems, use fishbone diagrams or the 5Why analysis method to trace the root cause, and solidify the countermeasures as PFMEA control points. Establish a regular equipment maintenance system, and implement life management for key tooling such as dies/spinnerets/calender rolls/coating heads.

The essence of fuzz is that the fibrils on the fiber surface peel off and break due to excessive friction or local stress concentration. The core of the solution is "reducing friction + maintaining smoothness": ensure sufficient and uniform oiling to reduce friction between fibers, regularly check and maintain the surface finish of yarn guides, and stabilize the drawing conditions to avoid stress concentration from local over-drawing.