Textile production requires many steps from the fiber to final product. Imparting color through dyeing and printing is critical in achieving both functional and esthetic requirements. The coloration process, specifically dyeing, has been recognized as using great amounts of water, energy, and chemicals during the processing. Greenhouse gasses are emitted during the process contributing to Climate Change. Excessive water use is problematic in water stressed regions of the world, and the dyeing effluent, containing chemicals used in achieving the desired color, is a major contributor to water pollution. There is increased attention to the environmental impact created during the dyeing process and legislation around the world, specifically in the EU, is being implemented to address these issues. The industry is examining processing technologies that result in cleaner production systems including reducing energy, water and chemical use. There have been various processes developed in addressing these issues including foam dyeing. Foam dyeing was first introduced in the late 1970s and recent innovations have improved the process. Foam dyeing uses significantly less water when compared to traditional dyeing methods. As less water is used, less energy is used in heating the dye bath and drying the fabric. A review of foam dyeing, the innovative changes that have been made to improve its performance, and results of research looking at the impact of dye class and the use of pretreatments on color uniformity, colorfastness, and reduction in processing time (which results in lower energy used and lower GHG emissions) are included. The study compared benchtop dyeing to scaled up processing of the fabrics and results are reported. Information on the optimum processing conditions (percent pretreatment used, dye class, processing variables) to achieve the desired performance (color, colorfastness) was determined. Various statistical methods were used in the analysis including ANOVA, T-Tests, and Tukey HSD, to identify significant groups. Through testing, it was found that the dye type and level of pretreatment has an impact on some of the colorfastness and washfastness scores. Results also showed there was no statistical significance between the L*A*B readings, colorfastness, and washfastness scores between benchtop dyeing, and foam dyeing.

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Combining Chemistry and Technology to Achieve Effective Color Fastness and Desired Color, with Foam Finishing Application

  • Nina Cohen,
  • Karen Leonas

摘要

Textile production requires many steps from the fiber to final product. Imparting color through dyeing and printing is critical in achieving both functional and esthetic requirements. The coloration process, specifically dyeing, has been recognized as using great amounts of water, energy, and chemicals during the processing. Greenhouse gasses are emitted during the process contributing to Climate Change. Excessive water use is problematic in water stressed regions of the world, and the dyeing effluent, containing chemicals used in achieving the desired color, is a major contributor to water pollution. There is increased attention to the environmental impact created during the dyeing process and legislation around the world, specifically in the EU, is being implemented to address these issues. The industry is examining processing technologies that result in cleaner production systems including reducing energy, water and chemical use. There have been various processes developed in addressing these issues including foam dyeing. Foam dyeing was first introduced in the late 1970s and recent innovations have improved the process. Foam dyeing uses significantly less water when compared to traditional dyeing methods. As less water is used, less energy is used in heating the dye bath and drying the fabric. A review of foam dyeing, the innovative changes that have been made to improve its performance, and results of research looking at the impact of dye class and the use of pretreatments on color uniformity, colorfastness, and reduction in processing time (which results in lower energy used and lower GHG emissions) are included. The study compared benchtop dyeing to scaled up processing of the fabrics and results are reported. Information on the optimum processing conditions (percent pretreatment used, dye class, processing variables) to achieve the desired performance (color, colorfastness) was determined. Various statistical methods were used in the analysis including ANOVA, T-Tests, and Tukey HSD, to identify significant groups. Through testing, it was found that the dye type and level of pretreatment has an impact on some of the colorfastness and washfastness scores. Results also showed there was no statistical significance between the L*A*B readings, colorfastness, and washfastness scores between benchtop dyeing, and foam dyeing.