Examination of variables that affect dyeing of acetate in a three dye system

Abstract

This research evaluated three variables within an AATCC experimental laboratory procedure for dyeing acetate. Evaluation of color measurement from test samples and transmission, an indicator of dye exhaustion, from final dyebath was focused on reproducibility of color from dyeing to dyeing and maximum dye exhaustion. Experimental effects were 1) pH of dyebath, 2) high dyeing temperature for the test fabric, an acetate tricot, and 3) time at the high dyeing temperature. Major findings included:

pH of 4 produces significantly higher X and Y color reflectance values, measured by the Color EyeR at the .05 level. pH of 4 and 6 produce significantly higher Z color values at the .05 level. Transmission readings, measured by the Spec 20R, indicate exhaustion for the Disperse Red 4, Disperse Blue 3, and Disperse Yellow 3 dyes and are significantly higher for pH of 4 at the .05 level.

Temperature of (150°F) 65.6°C and (175°F) 79.4°C give significantly higher transmission readings for Disperse Red 4 at the .05 level. (175°F) 79.4°C and (200°F) 82°C give significantly higher transmission readings for Disperse Blue 3 at the .05 level. Disperse Yellow 3 is unaffected by temperature.

Time at the high dyeing temperature had no effect on color measurements or transmission.

Transmission is a qualitative indicator of dye concentration and exhaustion.

Leakage was prevented with one time use of Ball Jar LidsR on the AATCC Wash Cups IIA used on the Atlas LaundryOmeter.R