On the same day, the polyester chain saw its upstream and downstream move in opposite directions. On September 24, PTA rose 2.85% to 7,147.50 yuan per ton, while polyester staple fiber gained 1.53% to 8,596.75 yuan per ton. Yet the three major polyester filament varieties all declined: FDY fell 1.37%, POY dropped 1.19%, and DTY slipped 0.27%. This pattern of feedstock holding firm while filament yields ground suggests cost-push and demand-pull forces are acting on the same supply chain simultaneously.
Why Feedstock Rose Alone
The PTA rally is not an isolated event. Year-on-year, PTA is up 56.30%, one of the highest gains in the textile sector. Acrylonitrile rose 35.82% year-on-year, nylon POY surged 38.88%, polyester FDY climbed 35.80%, and polyester POY gained 34.84%. Upstream feedstock gains generally exceed 30% year-on-year, meaning the cost center for polyester plants has been significantly elevated over the past year.
Notably, acrylonitrile, viscose staple fiber, spandex, and all nylon varieties held flat on September 24. The feedstock gains were concentrated in PTA and polyester staple fiber, appearing more like short-term fluctuations triggered by maintenance or supply contractions at specific plants rather than a systemic across-the-board rise. For downstream factories, this kind of single-point jump is the hardest to handle—it cannot be quickly absorbed through formulation substitution, nor is it easy to judge whether it will persist.
Filament Declines Reveal Real Demand
The simultaneous decline in the three major polyester filament varieties is the most direct signal from the demand side. FDY posted the largest drop at 1.37%, while POY and DTY fell more modestly. FDY is primarily used in weaving and home textiles, and its leading decline indicates weak purchasing willingness in the terminal weaving segment. POY, as a raw material for texturing, saw the second-largest drop, reflecting texturing plants' cautious outlook.
In contrast to filament, cotton yarn 21S and 32S held flat at 23,366.67 yuan per ton and 24,800.00 yuan per ton, with year-on-year gains of 5.89% and 5.31% respectively. Spun rayon yarn held at 18,425.00 yuan per ton, up 6.97% year-on-year. The stability of cotton and rayon yarn suggests relatively rigid demand for natural fibers and regenerated cellulose fibers, while polyester filament volatility stems more from internal supply-demand mismatches within the polyester chain.
Cotton lint edged down 0.23% to 17,399.17 yuan per ton, though still up 15.30% year-on-year. Raw silk held flat at 435,600.00 yuan per ton but fell 6.17% year-on-year, one of the few year-on-year decliners in the textile sector. Raw silk weakness is linked to export pressure in the cocoon and silk industry, squeezing profit margins for factories in the Jiangsu-Zhejiang silk belt even as input prices remain unchanged.
Impact on Industrial Belts and Exporters
From an industrial belt perspective, these data most directly affect polyester filament hubs such as Shaoxing Keqiao and Suzhou Shengze. Falling filament prices mean lower raw material procurement costs for weaving enterprises in the short term, but also suggest that grey fabric order prices may follow downward. Weaving plants in Shengze that stocked up on high-priced raw materials earlier now face non-negligible inventory impairment pressure.
For exporters, PTA's 56.30% year-on-year gain means the quotation basis for polyester fabrics has been raised. But falling filament prices give overseas buyers ammunition to push for lower prices. This scissors gap—high costs, low selling prices—is compressing margins for export intermediaries. Taking polyester FDY as an example: up 35.80% year-on-year but down 1.37% day-on-day, indicating prices are higher than last year but trending downward in the short term, with buyers increasingly adopting a wait-and-see approach.
Viscose staple fiber held at 14,580.00 yuan per ton, up 11.13% year-on-year, while spandex held at 29,000.00 yuan per ton, up 19.59%. The stability of these two varieties provides a relatively predictable cost environment for factories producing elastic fabrics and blended products. However, nylon DTY rose 29.83% year-on-year, nylon FDY gained 26.55%, and nylon POY surged 38.88%, with cost pressure on nylon products clearly exceeding that of polyester and viscose.
Practical Recommendations
For Buyers - With polyester filament in a clear short-term downtrend but PTA still up sharply year-on-year, adopt a phased price-locking strategy rather than bulk stocking - Monitor the FDY-POY spread; if FDY continues to fall faster than POY, prioritize FDY procurement for weaving - Nylon products are up over 26% year-on-year; where substitution is possible, evaluate the cost-effectiveness of polyester or blended alternatives
For Exporters - Incorporate PTA's 56.30% year-on-year gain into cost models when quoting, avoiding orders priced at last year's levels - Falling filament prices may trigger buyer pressure; consider including raw material price linkage clauses in contracts - Raw silk is down 6.17% year-on-year; silk export products may benefit from a favorable feedstock price window
Overall, the core signal from September 24 price data is that upstream cost rigidity and downstream demand elasticity are accelerating profit redistribution within the polyester chain. For factories, controlling raw material inventory cycles matters more than betting on direction; for buyers, phased operations are safer than concentrated orders.