Dalian Polytechnic University professor Zheng Laijiu presented work on dyeing aramid fibres with supercritical carbon dioxide at the Advanced Fibre Materials Innovation Conference in Shengze on 11 October, according to Consumer Daily's 13 October report.
The presentation addressed how aramid swells in supercritical CO₂ and how dyes dissolve in that medium. These are material-specific questions behind replacing a conventional water-based dye bath.
A process for a particular fibre
The report attributes claims of a technical breakthrough and proprietary intellectual property to Zheng's team. It does not provide operating conditions, comparative test results or the throughput of a commercial installation.
The conference also discussed how green fibres move from research samples into production and consumer products. Its wider cooperation announcements should not be read as orders for this particular dyeing process.
Where the development fits
The work places colouring alongside fibre performance in aramid development. The immediate significance is a reported processing route for a specific material. The conference account does not establish that all textile fibres can use the same process, or that the complete production chain operates without water.