Comparison of color gamut and fastness properties by using disperse and pigmented-based ink for textile inkjet printing Presented by: Dr.Yi Ding Fiber and Polymer Science, College of Textiles North Carolina State University, United States 1 Research background Textile inkjet printing provide new market opportunities for U.S. Key components: Development and improvement of fabric pretreatment agents Evaluation of various colorant sets formulated for Kyocera printheads Optimization of the digital printing process flow 1
Research background Specific studies conducted to date cover: Effects of pretreatment agents on the application of pigment and disperse dye based ink to polyester fabrics for outdoor products requiring lightfastness of 500 hours or more Color gamut analysis as a function of substrates, colorants and pre-treatment chemistries Research Objectives Side by side comparison of pigment/disperse dye-based inksets on polyester color gamut analysis wet and dry crock fastness light fastness Support the dot.com, quick response, and short run manufacturing models for suppliers of a multinational retail corporation and others implementing digital printing technologies 2
Technology 1. MS JP5Evo equipped with Kyocera print heads. 2. RIPMaster v11 and X-rite i1profiler version 1.6.3 software were used for calibration and characterization, and creating CTB and ICC profiles. 3. Color Think Pro v3.0.3 was used for visualize color gamut from ICC profiles, and calculated the color gamut volumes. 5 Experiment methods Ink comparison between: Inkset A (Disperse-based) (CMYK+Red, Blue, Purple) Inkset B (Pigment-based) (CMYK+Red,Blue,Green,Orange) CTB and ICC profile Lightfastness and crock fastness AATCC standard 6 3
Individual color comparison L* 100 80 60 40 20 0 Cyan Magenta Yellow Black Blue Red C* 80 60 40 20 0 Cyan Magenta Yellow Blue Red Inkset A Untreated Inkset A Pretreated Inkset B Untreated Inkset B Pretreated 7 Gamut Comparison Inkset A 4c & 7c 8 4
11/22/2016 ICC Color Gamut Comparison Inkset A1 Inkset A2 Inkset B1 Inkset B2 Inkset Gamut volume A1 (4c) A2 (7c) B1 (6c) B2 (8c) 135,687 186,533 152,317 188,426 Gamut Comparison between Inkset A and B (4 colors) Pigment Inkset B 4c Disperse Inkset A 4c Inkset Inkset A 4c Gamut volume 135,687 Inkset B 4c 161,305 10 5
Gamut Comparison between Inkset A and B (7 colors) Pigment Inkset B 7c Disperse Inkset A 7c Inkset Gamut volume Inkset A 7c 186,533 Inkset B 7c 168,825 11 Crock & Light fastness D/W D W Color Inkset A Inkset B Weft Warp Weft Warp Cyan 5 5 1.5 2 Magenta 5 5 2 2 Yellow 5 5 2 2 Black 4.5 5 2 2 Red 4.5 5 2 2 Blue 5 5 2 2 Orange 5 5 2 2 Green 2.5 3 Cyan 5 5 1.5 1.5 Magenta 5 5 2.5 2.5 Yellow 5 5 2 1.5 Black 4.5 5 2 2 Red 4.5 4.5 2 2.5 Blue 5 5 2 2.5 Orange 4.5 5 2 2 Green 3 3 12 6
Light fastness Color Cyan Magenta Yellow Black Red Blue Violet Green Exposure levels (h) Inkset A Inkset B 160 2.5 4.5 300 2.5 4 500 2 3.5 160 3.5 5 300 3 4.5 500 2 4 160 3.5 4.5 300 3 4.5 500 2 3.5 160 3.5 4.5 300 2.5 4.5 500 2 4 160 3.5 3.5 300 2.5 3 500 2 3 160 3 4 300 2 4 500 1.5 3.5 160 2.5 4 300 1.5 3.5 500 1 3 160 3.5 300 2 500 1 Conclusion Pretreatment enhances fiber receptiveness for the inks, leading to increased color intensity and color gamut. The particulate nature of pigments can lead to superior light fastness over disperse dye-based inks; the disperse dye based inksets did not give satisfactory light fastness at 300-500 h exposure levels. The inability of pigment particles to diffuse into the fibers during the fixation step can lead to crock fastness problems. Disperse dye inksets provided deeper color shades on PET, the L* of black color was much lower in Inkset F than in Inkset L, which would be helpful in increasing the color intensity for the prints. 7
Future work It should also be noted that the high temperature heat-setting process can cause fabric shrinkage requiring a preshrinking step. The fastness properties of the inksets used in this study merit further study with various photostabilizers and polymeric binders to enhance disperse dye lightfastness and pigment crockfastness, respectively. Of interest would be to determine whether optimum results are obtained in a pretreatment or post-treatment step. Acknowledgements Walmart US manufacture Innovation Fund Instruction from Dr. Freeman, Dr. Chapman, Dr. Shamey Technical support staff in College of Textiles and Department of Chemistry of North Carolina State University 16 8
17 9