T/UNP 731-2025 The technical requirements for natural dyeing process of tussah silk fabric

Scope

Main technical content: This standard specifies the general requirements, process flow, and technical requirements for the natural dye dyeing process of tussah silk fabrics. It is applicable to the production and processing of natural dye-dyed tussah silk fabrics. The general requirements include ensuring that the dyeing water meets water quality standards, that the raw fabrics are free from defects, and that pollutant emissions comply with standards. The process flow includes multiple stages such as raw fabric preparation and dye extraction. Among the technical requirements, the raw fabrics need to be inspected, flipped over, sewn, and pre-treated; there are requirements for water quality and containers in dye extraction; the dyeing process uses the immersion dyeing method, and operations such as standardized solution preparation and dye loading need to be carried out; washing, dewatering, and setting are performed according to standards, and the finished products are inspected and packaged before being stored. The appendix provides detailed regulations on sampling, dyeing operations, and dye extraction.

Development Information

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