The night trading session on July 3 revealed a noteworthy signal: the gains in PTA and staple fiber significantly outpaced those in cotton and cotton yarn. PTA's main contract closed at 5,468 points, up 1.37%; staple fiber closed at 6,870 points, up 1.15%; while cotton only rose 0.49% to 16,295 points, and cotton yarn edged up 0.09% to 22,745 points. The divergence between upstream raw materials and downstream spinning varieties points to structural differentiation within the industrial chain.
Upstream Cost Drive vs. Weak Downstream Follow-Through
The strong performance of PTA and staple fiber first reflects the tight supply-demand balance in the PX segment. Recent concentrated PX plant maintenance, combined with volatile but firm international oil prices, has compressed PTA processing margins, triggering a corrective rebound. Staple fiber, as a direct downstream of PTA, follows the logic of cost push, with low operating rates strengthening mills' willingness to support prices.
However, the significantly narrower gains in cotton and cotton yarn indicate that the downstream spinning sector has not kept pace with upstream price increases. Cotton futures have been fluctuating narrowly in the 16,200-16,300 range for several days, and the 0.49% gain was more of a follow-up move than active buying. Cotton yarn's mere 0.09% gain reflects the high inventory and low processing margins currently facing spinning mills.
Inventory Pressure Transmits Upstream
From the industrial perspective, inventory pressure in the cotton yarn segment is building. Since June, loom operating rates in the Jiangsu and Zhejiang regions have seen a slight decline, with terminal orders dominated by short-term, small-lot purchases lacking sustained volume. Yarn traders generally report slower sales, with finished goods inventory days rising from around 20 in May to 25-28.
This pressure is now transmitting to the cotton side. Spot cotton trading is sluggish, with outbound shipments from Xinjiang declining month-on-month and warehouse delivery prices in inland depots loosening by 50-100 yuan per ton. Cotton's night session gain was only one-third of PTA's, essentially reflecting market concerns about downstream absorption capacity—if raw material price increases cannot be passed downstream, they will eventually rebound upstream.
Substitution Effect Between Chemical Fiber and Cotton Heats Up
The strength of PTA and staple fiber also hints at an underlying trend: the substitution effect of chemical fiber for cotton is re-intensifying. The current price spread between cotton and polyester staple fiber remains above 4,000 yuan per ton, making it economically viable to increase the polyester content in T/C blended fabrics. Several Jiangsu weaving mills have explicitly stated they will shift some pure cotton orders to T/C blends or pure polyester products.
Once this trend solidifies, it will directly suppress incremental cotton demand while benefiting PTA and staple fiber consumption. In the night session data, the larger gain in staple fiber (1.15%) compared to cotton (0.49%) reflects this substitution logic in the futures market.
Bottle-Grade Chip's Follow-Up Move
Bottle-grade chip futures (PR2609) rose 0.55% to 6,574 points, with gains between those of PTA and staple fiber. As an end product of the polyester chain, bottle-grade chip's gain roughly tracks its raw material PTA but with a slightly lower magnitude, indicating that downstream polyester bottle chip mills have not seen significant margin improvement. The sector's operating rate remains around 70%, with decent export orders but slower-than-expected inventory destocking due to a delayed peak season for beverage consumption.