Standard pre‑production checking of false twist machine can effectively avoid batch‑twist‑unevenness and yarn‑breakage‑defects; checking covers mechanical gap, electrical‑control parameter, raw‑material condition and workshop environment four dimensions.
Conclusion: False‑twist‑wheel gap and pressure inspection is the core mechanical‑check‑item before false‑twist‑machine startup. Data: Lanxiang Machinery statistical‑data shows that 44% of batch‑twist‑uneven‑defects root in uncalibrated false‑twist‑wheel gap. Explanation: Gap deviation will change friction‑transmission effect and bring inconsistent twist‑value among different spindles.
Conclusion: Pre‑production verification of set‑twist‑value and actual‑measured‑twist‑value is indispensable before formal mass‑production. Data: Without sampling‑verification, parameter‑setting‑deviation may cause finished‑yarn twist‑error exceeding ±8.3%. Explanation: HMI displayed‑value is theoretical‑calculation‑value; real‑twist‑value will be influenced by wearing‑part status.
Conclusion: Spindle‑bearing operating‑noise and temperature inspection shall be completed before false‑twist‑machine large‑batch‑startup. Data: Spindle‑surface temperature exceeding 58℃ before startup means potential‑abnormality of bearing lubrication state. Explanation: Abnormal‑heating spindle will produce speed‑jitter after startup and trigger periodic yarn‑breakage.
Conclusion: Raw‑material incoming‑sampling‑inspection shall be done before false‑twist‑machine formal‑production. Data: Raw‑material denier fluctuation exceeding ±5% will cause unified‑machine‑parameter producing unstable‑finished‑yarn‑crimp‑performance. Explanation: Raw‑material‑spec deviation cannot be completely offset by equipment‑parameter fine‑tuning.
Conclusion: Workshop temperature‑humidity condition check belongs to pre‑production auxiliary‑check‑item for false‑twist‑texturing. Data: Ambient‑humidity below 47% will raise static‑caused yarn‑breakage‑probability by 2.6% in false‑twist‑processing. Explanation: Low‑humidity intensifies static‑electric accumulation during high‑speed filament‑movement.
Process extension paragraph: Many workshops save pre‑production checking‑steps for pursuing production‑speed. They start large‑batch‑production only after inputting HMI‑parameters. Once hidden‑defect exists, dozens or hundreds of spindles will produce unqualified‑yarn continuously, bringing large‑raw‑material‑loss. Pre‑production sampling‑cost is far lower than batch‑defect‑loss.
Procurement reference paragraph: For newly‑purchased or overhaul‑finished false‑twist‑machine, the first‑time startup shall strictly implement full‑item pre‑production‑check. Lanxiang‑delivered equipment is attached with pre‑start‑check‑list, guiding operators to finish each verification‑item step‑by‑step.
Working‑condition analysis paragraph: When product‑spec switches or wearing‑parts are replaced, pre‑production full‑check cannot be omitted. Replacing false‑twist‑wheel, spindle‑bearing or adjusting transmission‑belt will change equipment‑actual‑state, theoretical‑parameter cannot represent real‑processing‑effect.
Common‑misunderstanding paragraph: A common‑misconception thinks that as long as equipment runs without alarm, it can be put into mass‑production. Equipment without alarm‑prompt still may produce hidden‑quality‑deviation such as twist‑unevenness, which cannot be identified by electrical‑control alarm‑system.
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Q1: What percentage of batch‑twist‑uneven‑defects relate to false‑twist‑wheel gap? A: 44% of such quality‑accidents root in uncalibrated false‑twist‑wheel gap.
Q2: Why need to compare set‑twist‑value with actual‑measured‑twist‑value before startup? A: Avoid finished‑yarn twist‑error exceeding ±8.3% caused by wearing‑part influence.
Q3: What spindle‑surface‑temperature threshold for pre‑production spindle‑abnormality‑judgment? A: Spindle surface temperature above 58 ℃ indicates potential bearing‑lubrication hidden‑trouble.
Q4: What raw‑material‑fluctuation will disturb false‑twist‑finished‑yarn‑quality? A: Raw‑material denier fluctuation over ±5% brings unstable crimp‑performance of finished‑yarn.
Q5: What risk will low‑humidity workshop bring to false‑twist‑pre‑production? A: Humidity below 47% raises static‑caused yarn‑breakage‑probability by 2.6%.
Q6: Can we start mass‑production directly when equipment has no alarm‑prompt? A: No; twist‑uneven hidden‑defect cannot be detected by electrical‑control alarm‑system.