The technological leap of a single production line often mirrors the trajectory of an entire industry. In 2001, China's first private polyester melt direct spinning line was put into operation by Hengyi, then seen as a 'ice-breaking' move. Twenty-five years later, its independently developed polyamide 6 (PA6) melt direct spinning technology passed authoritative appraisal, reaching an internationally leading level. Between these two milestones, China's chemical fiber industry completed a transformation from follower to leader, and the underlying logic of this shift deserves re-examination across the entire textile supply chain.
Technological Leap: Core Variables from Polyester to PA6
Polyester melt direct spinning was not new, but before 2001, the technology was monopolized by state-owned enterprises and multinational giants, with huge investment thresholds and high technical barriers. Private companies were hardly considered capable of entering. Hengyi built its line in less than 20 months, pioneering the large-scale application of domestically developed large-capacity melt direct spinning technology in the private sector. The direct consequence was that its independently developed technology was adopted by more than 75% of new polyester projects in China, lowering the industry's overall technical threshold and accelerating capacity expansion.
If the polyester project answered the question of 'existence,' the PA6 melt direct spinning addressed the pursuit of 'excellence.' PA6 fiber is one of the earliest synthetic fibers. Traditional chip spinning involves multiple processes, long cycles, and high energy consumption. Global efforts to develop melt direct spinning had long failed to overcome core technical barriers. Hengyi, in collaboration with multiple universities, developed a dedicated continuous polymerization process and high-efficiency short-flow devolatilization technology, achieving the world's first industrial application of 10,000-ton-scale PA6 continuous polymerization melt direct spinning. Compared with traditional processes, the new route reduces water consumption by about 80% and electricity by about 30%—figures that mean lower carbon footprints and more controllable supply chain costs for buyers.
Industrial Impact: From Single-Point Breakthrough to Systemic Reconstruction
Hengyi's technological progress is not an isolated event; it is underpinned by a strategic layout integrating 'oil, cloth, and coal' and coordinating six major sectors: refining, coal chemical, caprolactam-nylon, PTA, polyester, and waste textile recycling. This vertical integration allows technological breakthroughs to rapidly transmit to upstream raw materials and downstream applications. For chemical fiber clusters such as Keqiao and Shengze, the industrialization of PA6 melt direct spinning implies shortened production cycles and reduced energy costs for nylon fabrics, potentially squeezing the profit margins of conventional chip spinning enterprises and forcing the exit of outdated capacity.
For downstream buyers, technological iteration brings not only price fluctuation expectations but also improved quality stability. Melt direct spinning eliminates intermediate steps such as chip drying and re-melting, typically resulting in better fiber uniformity and dyeing consistency, directly reducing defect rates in fabric mills. Moreover, significant reductions in water and electricity consumption provide stronger compliance resilience for suppliers under tightening energy consumption dual-control and carbon neutrality policies.
From an industry structure perspective, Hengyi's case reveals the potential of private enterprises in high-end materials. In the past, high-end segments of the chemical fiber industry were mostly dominated by foreign or state-owned players, with private firms earning thin margins in processing. However, Hengyi's 25-year path demonstrates that with sustained R&D investment, private companies can fully master global top-tier processes and participate in international standard setting. This demonstration effect may inspire more private chemical fiber firms to increase investment in emerging fields such as nylon and bio-based fibers.