The landscape of textile raw materials is quietly shifting. As cotton prices fluctuate amid supply-demand games and chemical fiber capacity approaches its ceiling, a traditional agricultural residue—wheat straw—is being pushed onto the stage as a substitute for wood pulp. A recent study led by Canopy indicates that wheat straw fiber can technically fully replace wood in producing viscose and lyocell fibers. This is not just a raw material innovation but could reshape the cost structure of the entire regenerated cellulose fiber industry.
The Underlying Logic of Raw Material Supply
China is the world's largest wheat producer, with an annual output exceeding 130 million tons, corresponding to nearly 200 million tons of wheat straw resources. Currently, most of this straw is returned to fields or burned, with less than 15% entering industrial utilization. Converting wheat straw into textile raw materials could unlock a potential fiber pool of tens of millions of tons per year.
In terms of fiber performance, wheat straw has a cellulose content of about 35%-40%, lower than wood's 40%-50%, but through optimized pulping processes, it can fully meet the quality standards of viscose-grade dissolving pulp. More critically, wheat straw has a one-year growth cycle, while wood requires 5-10 years or more. This means higher stability in raw material supply, less affected by natural climate and logging quotas.
Processing Costs and Industrialization Hurdles
The industrialization of wheat straw fiber is not without obstacles. The biggest bottleneck currently lies in impurity removal during pulping. Wheat straw has a high silicon content (about 5%-8%), which in traditional alkaline pulping forms silicate scale, increasing equipment cleaning frequency and energy consumption. However, domestic companies have developed a pre-hydrolysis alkali extraction combined process, increasing silicon removal rate to over 90%, raising the alpha-cellulose purity of wheat straw pulp to over 95%, meeting viscose spinning requirements.
From an economic perspective, the purchase price of wheat straw is about 200-300 yuan per ton, far lower than wood's 500-800 yuan per ton. However, considering transportation radius (wheat straw has low density, typically economic transport within 50 km) and additional desilication steps, the comprehensive cost of wheat straw pulp is still 10%-15% higher than wood pulp. But as environmental policies tighten restrictions on logging, the price of wood pulp is trending upward, narrowing the cost gap.
Impact on Procurement and Foreign Trade
For fabric buyers, the introduction of wheat straw fiber means an additional traceable, low-carbon raw material option. Against the backdrop of increasingly stringent carbon footprint requirements from European and American brands, wheat straw fiber has a carbon footprint (about 0.8 kg CO₂e/kg fiber) significantly lower than traditional viscose (about 1.5 kg CO₂e/kg fiber) and is easier to obtain FSC or PEFC sustainability certifications.
Foreign trade companies need to note that current wheat straw viscose capacity is mainly concentrated in major wheat-producing regions like Shandong and Henan, mostly in small to medium-sized pulp mills. Products have not yet formed standardized export specifications, with batch-to-batch variations in color fastness and strength indicators. However, leading regenerated cellulose fiber companies have started pilot lines for wheat straw pulp, and commercial-scale production of wheat straw-based lyocell is expected within the next 2-3 years.