Dew-Retted Heilongjiang Line Fiber Processing Parameters for Ring Frames
Optimize wet ring frame trough temperatures to 72°C and hold draft ratios below 17 for Heilongjiang dew-retted line flax to limit end breaks.
Top Roller Durometer
Rubber Hardness
Measuring instrument verification sits at the spinning preparation floor within Chinese linen mills, where drafting apparatus undergoes daily scrutiny to secure even sliver attenuation. Top roller durometer readings govern elastomer resilience across high-speed drawing frames processing flax roving before yarn formation. Mill operators check Shore A values daily against internal maintenance schedules to prevent drafting slip during fibre acceleration.
Excessive resilience loss leads directly to uneven drafting zones, which causes yarn weight variation in subsequent spinning steps. Technicians record surface indentation depths in the mill machinery logbook before every shift starts.
Shore Limits
Elastomer degradation parameters dictate replacement thresholds for drawing frame components handling coarse bast fibres. Surface indentation values falling outside the seventy to eighty Shore A bracket trigger immediate disassembly of the affected drafting assembly. Lower hardness levels indicate thermal softening caused by continuous friction against dried flax strands during high-humidity spinning operations.
Higher readings show rubber hardening from plasticizer migration, a process that creates hard spots and damages delicate linen filaments. Mill engineering teams enforce these strict boundaries to protect staple length uniformity across wet and dry drafting fields.
Fibre Control
Drafting pressure calibration depends entirely on elastomer elasticity to maintain consistent nip resistance against steel bottom cylinders. Roving integrity relies on stable surface friction coefficients provided by correctly cured top cots during the drawing stage. Insufficient surface deformation allows sliver bunching, whereas excessive indentation crushes individual flax fibres and weakens the spun yarn structure.
Plant supervisors audit durometer logs weekly to verify that mechanical settings match ambient room conditions inside the spinning shed. Elastomer resilience dictates yarn tensile strength consistency throughout subsequent weaving preparation stages.