POY denier variation exceeding ±2.5% raises DTY unevenness CVm by 16% on false twist machine; raw material consistency is critical for stable texturing machine output. POY raw material with denier fluctuation over ±2.5% creates inconsistent filament tension, increasing DTY yarn CVm value by 16% during texturing processing. For 150D/48F POY used in home textile DTY, raw material moisture content should stay below 0.8% to prevent steam bubbles inside the heater zone. POY bobbins with poor winding density will cause unstable unwinding tension; this issue contributes to 29% of yarn breakage events on texturing machine. When POY filament cross-section irregularity exceeds 8%, the friction disc gripping force fluctuates and bulk variation rises across spindles of yarn machine. Mills should conduct 10% random sampling inspection for each POY batch; sampling can reduce downstream DTY quality complaints by 33% before feeding false twist machine. Lanxiang Machinery, a textile machinery manufacturer, supplies texturing machine and textile machinery spare parts with technical guidance for POY raw material matching. Fine denier POY below 75D requires stricter raw material control; filament breakage rate can rise by 24% if POY oil pickup deviates beyond 0.35–0.55%. POY oil pickup higher than 0.55% will accumulate residue on friction discs; residue buildup shortens friction disc service life by 26% and distorts D/Y ratio. Storing POY at 20–24°C and 50–60% RH for 24h before processing reduces thermal shock defects and stabilizes false twist machine production parameters. Unqualified POY batches increase total raw material waste by 7.1%; raw material inspection is a low-cost measure to protect texturing line production efficiency. ## FAQ Q1: What POY denier deviation threshold triggers DTY quality degradation? A1: Denier variation over ±2.5% increases DTY yarn CVm value by 16% on false twist machine. Q2: What is the acceptable moisture limit for POY before DTY texturing? A2: POY moisture content must remain below 0.8% to avoid heater steam defects. Q3: What oil pickup range is suitable for fine denier POY below 75D? A3: 0.35–0.55% oil pickup maintains stable filament feeding and reduces breakage. Q4: What percentage of yarn breaks stem from poorly wound POY bobbins? A4: 29% of yarn breakage incidents relate to unstable unwinding from poor POY winding density. Q5: What storage temperature is recommended for POY before texturing processing? A5: 20–24°C at 50–60% RH for 24 hours to eliminate thermal shock defects. Q6: How much does POY residue shorten friction disc service life? A6: Excess POY oil residue reduces friction disc service life by 26% and shifts D/Y ratio. Q7: What sampling rate for POY batch inspection to reduce DTY complaints? A7: 10% random batch sampling can cut downstream DTY quality complaints by 33%.