T/ZFB 0014-2022 The determination of evenness of dyeing for spun core natural yarn using parallel dyeing method

Scope

Main Technical Content: This standard specifies the principles, reagents and materials, equipment, test procedures, precautions, and test reports for determining the dyeing uniformity of core-spun yarns using the parallel dyeing method. Based on the characteristics of core-spun yarn products, the test mainly involves four types of dyes and four reagent ratios. 1. Sampling and Sample Preparation - Sampling and sample preparation: Refer to GB/T 6502 and GB/T 6508. The length of each sock cuff sample is 10–30 cm. 2. Dye Selection - 2.1 Active dyes for dyeing viscose: Require no color transfer to nylon. This test uses C.I. Reactive Red 195, which is specified in the standard text. - 2.2 Acid dyes for dyeing nylon: Require no color transfer to viscose. This test uses C.I. Acid Black 172, which is specified in the standard text. - 2.3 X-type cationic dyes for dyeing acrylic and room-temperature cationic-modified polyester: Specified in the standard text as C.I. Basic Yellow 28. - 2.4 Disperse dyes for dyeing polyester: Specified in the standard text as C.I. Disperse Blue 56. 3. Dyeing Process - 3.1 Pre-treatment of sock cuffs: Use neutral soap flakes or soap powder to adapt to various fiber properties. - 3.2 Dyeing - 3.2a Dye dissolution conditions: - Active dyes: Dissolve in water at temperatures below 50°C. - Acid dyes: Dissolve in water at 90°C. - Cationic dyes: Add 100 g/L of the dye to ice acetic acid solution at 90°C. - Disperse dyes: Dissolve in water at temperatures below 40°C. - 3.2b Dyeing process: - Active dyes: Dye at 60°C for 30 minutes, then fix with soda ash for 45–60 minutes. - Acid and disperse dyes: Dye at room temperature (1°C/min increase to 98°C) for 45–60 minutes. 4. Instrumental Color Evaluation - Evaluate the samples visually and use a colorimeter to test and record the color difference rating. 5. Visual Color Evalu

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