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Computer color matching system in textile industry
- 1. An Assignment On Role of computer color matching system in textile industry Course Title: Application of computer in textile. Corse Code: CSE 415 Submitted To: Shariful Islam Lecturer Department of Textile Engineering City University Submitted by: Md. Zahid Hasan ID: 173375179 Batch: 37th Program: BSTE Submission Date: 30th April, 2021
- 2. Introduction Color matching and color control have becomean integral part of dyeing industry. Computer Color Matching System is developing by different manufacturers. Among all of them DATA COLOR is bestin this regard. Computer Color Matching System(CCMS) predict very close recipe for any shade with advanced spectrophotometerand color software. History of CCMS First in 1963, ICI, Dyestuff Division established the Computer System for color match prediction in their lab, but it was for their customer only. Later in 1973, ICS (international colour system), manufactured computer matching system commercially. What Is Color And Color Matching? Color has a degree of lightness or value Hue is the actual color Color has some saturation- The amount of color present Color matching for fabric is the technique of identifying the dye Combinations present in the fabric and replicating.
- 3. How Computer Color Matching Is Done? A color match predictability system has the following: A predictability guide A spectrophotometer, And a computer with input and output devices. A light is directed at the color sample and then passed into the spectrophotometer where its color spectrum is analyzed, converted into data, and fed to the computer. The quality of the color match for the various formulations is analyzed to determine the formulation having the bestpossible color match. The modified sample having the bestcolor match may be viewed by the user to predict the color of the final product. Different Parts of CCMS 1. Computer: Computer is needed for CCMS. In this system special software is installed in the computer before run the CCMS. Spectrophotometerand printer is joined with the computer. When spectrophotometer analyzes the color the results show in the monitor and if needed results could be print out by the printer. All the information is send from the hard disk of the computer. 2. Spectrophotometer:Spectrophotometeris the main instrument of CCMS. Spectrophotometerhas a sample holder in the middle of the front side. The sample holds on there. Then it takes the reflection of the light and analyzes the depth of the color and shows the results on the computer monitor. It also makes decision about the fastness properties of the sample. 3. Printer: Printer is joined with the computer for printing the results.
- 4. Functions of Computer Color Matching System The following can be done by using CCMS - Color match prediction. Color difference calculation. Pass/Fail option. Color fastness rating. CostComparison. Strength evaluation of dyes. Whiteness indices. Reflectance curve and K/S curve. Production of Shade library Etc. Advantages of CCMS Customers get the exact shade wanted with his knowledge of degree of metamerism. Customers often have a choice of 10-20 formulation that will match color. By taking costing, availability of dyes, and auxiliaries into account, one can choosea best swatch. 3 to 300 times faster than manual color matching. Limited range of stockcolor needed. Limitations of CCMS Calibration Samples: The dyeing conditions in the laboratory & productions differ in various respects viz, M: L ratio, auxiliaries dyeing machines, exhaustion of dye etc. Change of Substrate: It is very difficult to maintain the characteristic properties of the substrate as regards the quality of the fibers, yarn structure, fabric construction, color, heat setting, pretreatments, etc. which in turn changes the dye uptake properties of the fiber. It is particularly impossible to prepare the basic calibration data under all such variation. Change in Dyestuff: Every incoming batch of the dye stuff requires testing for tonal & strength changes which needs recalculation of the recipe. Recipe suggested
- 5. by the computer are based on minimum color difference within given tolerance & least metamerism in CIELAB scales. But always CIELAB tolerances do not confirms exactly with human perceived color difference. Light sources used to test the match, are CIE standardized simulated standard illuminant, which are not same in all respectwith natural sunlight. Instrumental accuracy may be checked periodically. The kubelka-munk equation & optical theory of computer colour matching do not apply strictly on extra glossy or fluorescent samples. Other Application of CCMS In Dye House Forquality controlof dyed textiles. ForEvaluation of Quality of dyes supplied. Role of dyeing additives by measuring colour yield. Efficiency of optical brighteners by UV analysis. Soil removal efficiency of surfactants by measuring Reflectance value. Measurement of whiteness/yellowness/brightness index etc. Conclusion At the end, it may be said that after necessary training and guidance, this Instrument of CCM system can be used successfully for its versatile use including Computer Aided Color measuring and Matching purposewhich needs to be implemented in all dye houses of either all textile dyeing or jute dyeing to derive the above said benefits of precessionmatching and customer satisfaction.