Coffee bean skin waste extraction for silk dyeing

Abstract

Coffee bean skin waste has been used as a coloring agent in the process of dyeing silk threads by varying the concentration of coffee bean extract extracts in 4 treatment stages, each 50 g/l, 100 g/l, 150 g/l and 200 g/l and varying the fixation solution lime also in 4 levels of treatment each 25 g/l, 50 g/l, 75 g/l and 100 g/l to obtain 16 kinds of silk thread colors. The parameters tested included color aging, color fastness to washing, rubbing, sweat and light. The aim of the study was to obtain the best treatment from the coloring process carried out, while the overall test results met the SNI quality requirements for how to test color fastness for washing, sweat and rubbing (BSN, 1989), except the results of the test for color fastness to light. The best treatment was obtained at the extraction concentration of 150 g/l coffee beans and the concentration of lime fixation solution 75 g/l produced a color aging K/S 20,93, color fastness to washing value 3-4 (enough) for discoloration and 4 (good) for color staining, color fastness to rubbing value 4 (good) for dry rubbing and 3-4 (enough) for wet rubbing, color fastness to perspiration value 4-5 (good) for acid and base rubbing as well as resistance color fastness to light values 2-3 (less).