I wanna share my first job experience as industrial engineering development program at PT Indo Taichen Textile Industry. First, I studied in the lab to know color, dyestuff and the chemicals used. And also learn how to color matching, adjust recipes, spectro, lab scale dyeing processes, instrumentation tools in the textile lab. After that, I went to dyeing department, I was taught in more depth about Datacolor spectrophotometry, how to topping the color if the dye results were still far from standard and got to know the flow of the large-scale dyeing process. The first task is analyzing “Titik L”, it means the difference in color absorption between lab and dyeing. As we know that there will always be differences between small and large scales (production/bulk), therefore I analyzed how much change occurred based on the hue and the lightness. This aims to help colorists in providing recipes by paying attention to the difference in absorption between LAB and DYE, whether it is a new recipe or a setting recipe. For example, Color : Belgian blue for 100% Cotton, Heavy Jersey Biowicking. Lab recipe (S1) is close to standard but after dye at production the hue is yellower, greener and darker. Apart from analyzing color, I also analyze during production such as pH suitability, specific gravity, fabric whiteness level, machine settings, temperature and process flow. If there is a problem such as something not following the standard during the dyeing process, we can try again with the same recipe. But if there are no problems throughout the normal process, we have to adjust the recipe to minimize process failures due to different colors/hue. For this case, I recommend to the colorist to decrease 5% for yellow dyestuff (R-1-012) and decrease 3% for red (R-3-002) and blue dyestuff (R-4-005) because the lightness is too dark. Unfortunately, the colorist decided to increase the percentage of red and blue dyestuff, so the dyeing results is bluer and too dark as you can see the second recipe (S2). Then we dyed in lab scale, the hue is too blue and darker. For dye production the hue is closer than before but not for the lightness. Because after coloring there is another process so we have to know what the finishing changes will be like (Titik D). But at that time, I only followed the color changes from lab to dyeing, it's possible that in finishing the changes weren't as much as between lab and dyeing. At the end, I still check the quality and final color. I have done this during the SP 2024 order season, and many of the sample results show good color accuracy and quality and the use of this L point.
