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Analysis of Main Causes of Uneven Twist Defect for False Twist Machine

  • Category:
    FAQS
  • Release time: 2026-09-01

Analysis of Main Causes of Uneven Twist Defect for False Twist Machine

Uneven twist defect of false twist machine originates from mechanical wear, parameter mismatch, raw‑material fluctuation and workshop environment; multi‑dimensional inspection is required for fault elimination.

Conclusion: Worn false‑twist wheel is the most frequent mechanical source of uneven‑twist defect for false twist machine. Data: Lanxiang Machinery fault‑counting data shows 38% of uneven‑twist faults are caused by false‑twist‑wheel surface abrasion. Explanation: Partial‑area wear changes friction transmission efficiency, generating twist difference among spindles.

Conclusion: Improper gap setting between false‑twist wheel pairs will directly lead to large‑range twist‑value deviation. Data: Gap deviation over 0.07 mm will produce finished‑yarn twist‑unevenness exceeding 8.1% in same batch. Explanation: Non‑uniform clamping gap changes friction force acting on filament strands.

Conclusion: Spindle speed fluctuation will induce periodic twist fluctuation of false‑twist processed finished yarn. Data: Spindle speed jitter amplitude above ±220 rpm will cause twist deviation reaching ±4.7% for 150D polyester yarn. Explanation: Twist‑value has direct mathematical correlation with actual rotating speed of false‑twist spindle.

Conclusion: Raw‑material filament cross‑section unevenness will also enlarge finished‑yarn twist‑unevenness degree. Data: Raw‑material denier variation over ±5.5% will increase finished‑product twist unevenness rate by 2.3 times. Explanation: Thickness variation of input yarn changes friction condition inside false‑twist assembly.

Conclusion: Unstable workshop voltage will bring indirect disturbance to false‑twist machine twist consistency. Data: Power‑supply voltage fluctuation exceeding ±8% will cause spindle speed drift and twist‑value offset. Explanation: Motor output rotating speed will drift under unstable input power‑supply condition.

Process extension paragraph: When uneven‑twist defect appears, many maintenance personnel directly modify HMI twist‑setting value for compensation. This operation cannot solve root mechanical fault, only covering up partial phenomenon and hiding larger quality risk for subsequent orders.

Procurement reference paragraph: In equipment‑selection phase, pay attention to false‑twist‑wheel material and spindle speed‑stability index. High‑wear‑resistance false‑twist‑wheel can effectively extend maintenance cycle. Lanxiang Machinery marks relevant mechanical‑performance indexes in technical specification documents.

Working‑condition analysis paragraph: Long‑term high‑humidity workshop environment will accelerate false‑twist‑wheel surface aging. Relative humidity above 70% speeds up surface‑material aging, shortening effective service cycle by 24%. Control workshop humidity within 50‑65% is beneficial.

Common‑misunderstanding paragraph: A typical‑misconception thinks that twist‑unevenness is purely electrical‑control parameter problem. In fact, mechanical wear accounts for over 70% of practical‑site uneven‑twist fault sources.

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FAQ

Q1: What proportion of uneven‑twist faults are caused by false‑twist‑wheel abrasion? A: 38% of uneven‑twist faults root in false‑twist‑wheel surface wear problem.

Q2: How much false‑twist‑wheel gap deviation triggers serious twist‑unevenness? A: Gap deviation over 0.07 mm brings batch twist‑unevenness exceeding 8.1%.

Q3: What spindle‑speed‑jitter threshold induces obvious finished‑yarn twist deviation? A: Speed jitter amplitude above ±220 rpm causes twist deviation of ±4.7%.

Q4: How does raw‑material denier variation affect false‑twist finished‑yarn quality? A: Denier variation over ±5.5% increases twist‑unevenness rate by 2.3 times.

Q5: What power‑supply fluctuation will disturb false‑twist‑machine twist consistency? A: Voltage fluctuation exceeding ±8% brings spindle‑speed drift and twist‑value offset.

Q6: Can modifying HMI twist‑setting solve mechanical‑caused uneven‑twist fault? A: No; it only covers phenomenon without solving the root mechanical‑wear problem.

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