"Selection Path for Safety Standards of Medical Grade Towels" ！
"Nanometer Microcapsules for Color Fixation and Five-Step Purification: The Selection Path for Medical Grade Towels Based on Safety Standards"
1.Technical breakthroughs in chemical safety red lines
Analysis of Traditional Dyeing Risks:
Azo dyes: Contain -N=N- carcinogenic groups (prohibited under the REACH regulations Appendix 17)
Fluorescent whitening agent: Migration rate up to 23% (detected by SGS report CTI-2025HJ102)
EU ECO-CERT Solution
Dye composition:
Plant-derived pigments (Lilac Blue/Safflower Red)
Nano-silica microcapsules (particle size 50nm)
Reactive crosslinking agent (modified with epichlorohydrin)
2. Five-stage water washing purification system
Full-process parameter control:
Process Temperature Time Chemical Additive
Process: Biological enzyme decomposition Temperature: 60℃ Time: 40min Chemical Additive: Papain 0.5g/L
Process: RO reverse osmosis Temperature: 45℃ Time: 30min Chemical Additive: Deionized water conductivity ≤ 5μS/cm
Process: pH balance Temperature 40℃ Time: 20min Chemical Additive: Acetic acid to adjust pH 5.5-6.5
2. Heavy metal removal efficiency
Lead residue: Not detected (Detection limit: 0.1 mg/kg)
Formaldehyde content: < 2mg/kg (National Standard Class A ≤ 20mg/kg)
3. Breakthrough in Nano Fixation Technology
The mechanism of microcapsule action ：
[Cotton fiber] -- OH + [Microcapsule] -- Si(OH)₃ → Formation of Si-O-C covalent bonds
Durability test results:
Test items: Abrasion Resistance Color Fastness National standard requirement: ≥ Grade 3 JS-21S actual measurement: 4-5 grades
Test items: Sweat Stain Resistance Color Fastness National standard requirement: ≥ Grade 3 JS-21S actual measurement: 4 grades
Test items: Color Difference ΔE after 200 Washes National standard requirement: ≤ 3.0 JS-21S actual measurement: ≤ 1.2
