Flax Roving Wet Spinning Attenuation Defect Mechanisms
Flax roving wet spinning attenuation defects stem from improper hot-water pectin softening and front roller nip slip, manageable through precise temperature and pressure control.
Uster Spectrogram
Frequency Analysis
A graphical representation displaying the wavelength and amplitude of periodic mass variations identifies mechanical equipment faults across textile yarn preparation and spinning lines. The uster spectrogram converts continuous signal data from capacitive mass testing into discrete wavebands spanning from one centimeter to one hundred meters. Analysis of peak heights on this chart pinpoints exact mechanical components responsible for periodic sliver or yarn unevenness.
Harmonic Interpretation
Distinct peaks along the wavelength axis correlate directly with the rotational circumferences of specific draft rollers or aprons. Short-wavelength peaks occurring at distances equal to top roller circumferences signal eccentric drafting rollers or worn bearings on wet spinning frames. Medium-wavelength peaks point to defective aprons or improper gear mesh on drawing frames, while long-wavelength hills indicate draft waves caused by floating fibers during attenuation.
Mathematical formulas multiply the peak wavelength by draft ratios to trace defects back to earlier preparation steps, such as carding or hackling. Identifying periodic defects early prevents mass rejection of woven linen fabric showing repetitive drafting patterns or barré defects.
Diagnostic Limit
Random, non-periodic fiber distribution variations appear as a smooth chimney-shaped curve rather than distinct spikes on the chart. Natural fiber length variation in flax inherently elevates background noise, requiring higher peak thresholds before declaring a mechanical defect.