The Application Of Computer Color Matching System For Melange Yarn And The Evaluation Of Non-homogeneous Effect

A variety of colored fibers blended in accordance with a certain proportion can get rich andcolorful space stereoscopic color-blended effect and this melange yarn product is increasingly tovast consumers.At present, the monochrome types and inventory in the production will greatlyincrease in order to meet consumers requirements and it will not only increase the productioncost,but also is difficult for the industry to adapt to the market demands of smallbatch,multi-varieties,accurate-matching and fast delivery.In addition, the two homogeneous andnon-homogeneous color-effects on the melange yarn’s surface between visual evaluation andinstrumental measurement still show certain difference,which is difficult to take thecommunication between the industry and customers.Therefore,a series of experiments arestudied in this paper.First,the application performance of computer color matching system invented by ourresearch group for melange yarn and the optimization of the sample library is studied.Theexperimental verification shows, expect the matching error of the small proportion of fibers isslightly bigger, the forecasting color differences of the other proportion of fibers are fluctuatingin a certain range and they are in0~1.2CIELab,which has reached the matching accuracyrequirements of the enterprises and can be used in the textile industry. And the computercolor-match efficiency has been greatly improved than the artificial color-match speed.At thesame time,according to the more-types, incomplete and uneven distribution of hue of themonochrome samples, the database of the monochromatic fiber is optimized.The amount oforiginal89monochrome samples is optimized for22by the Munsell hue wheel system.Thecomputer color matching system invented by our research group for melange yarn is used tomatch and forecast and the color-match result is verified.The experiment results indicate that theoptimized database can basically replace the original one.Second,according to the experimental results,a way to pre-control the color-match effect ofcotton blended textiles’s appearance is studied. An experiment that discriminates appearanceeffect on blended fibers sample by human eyes is made to determine the color tolerance threshold of cotton blended textiles. The results indicate that under certain production processcondition,criteria for judging homogeneous effect are ΔECMC(2:1)≤10and non-homogeneouseffect is ΔECMC(2:1)＞10.Under this criteria guide,when choosing the pre-dyed fibers,thecolor-matching effect will have a good consistency with visual matching effect.At last,an evaluation method on the non-homogeneous effect of the cotton blended textiles isdeveloped and the non-uniform effect on the surface of cotton blended textiles is evaluated byusing human visual and psychology and physical statistics methods. The influence on thenon-uniform effect by the lightness of the blended sample and the color difference betweenfibers is studied and the non-uniform effect distribution is obtained.The results indicate that thenon-uniform effect increases first and then decreases with the increasing lightness of the blendedsample and the non-uniform effect is always increasing with the increasing color differencebetween fibers. The non-uniform effect distribution is obtained and can be applied to evaluatethe non-uniform effect of the blended textiles in certain production condition.