Study On The Fuzzy Heald-saving Design And Color Prediction Of Yarn-dyed Fabrics And Its CAD System Implementation

With the spread of electronic dobby and jacquard loom, the number of harnesses in theexisting electronic dobby is more than normal looms (16harnesses). However, it is necessary topropose a new method of dobby design to make up the lacking in large weave cycles, beautifulpatterns and less number of harnesses. Furthermore, the dobby design CAD system is mainly inyarn-dyed fabrics designing, it could replace fabric proofing if fabric color values be predictedaccording to the parameters such as weave structures, yarn color and so on. In view of the abovequestions, this paper study on the fuzzy heald-saving design and color prediction of yarn-dyedfabrics, and develop a CAD system on the basis of fuzzy heald-saving mathematical model andStearns-Noechel model in Visual Basic6.0development environment.Firstly, the value of image binarization should be determined in order to allow the user has avariety of image processing options. After selected the image, it can automatically generate aweave structure with the determined the number of warp and weft cycle, and make sure theweave patterns be close to the original image.Secondly, propose a fuzzy heald-saving mathematical model. By analyzing the principles ofdobby weaves, the weave diagram, drafting plan and chain plan can be converted to thecorresponding weave matrix. Then according to the mathematical model when the number ofharnesses during weaving was greater than the limited number of loom harnesses or exceed thenumber of harnesses indicated by users, the looming draft would be generated which wassuitable for dobby weaving and maintained a substantially pattern; meanwhile, it can also changethe weaves according to the loom draft such as two consecutive patterns and four consecutivepatterns.Thirdly, study the feasibility of Stearns-Noechel model on color prediction of yarn-dyedfabric. The prediction of fabric color refers to geometric models of fabric and color predictionmodels, in this paper, factors like warp linear densities, weft linear densities, the density of warpand weft yarns, weave structures and so on were parameterized, and the defects of geometricmodels was pointed out. Using a best-fit algorithm, the value of parameter b of the Stearns-Noechel model was adjusted and corrected. The results show that it could not onlypredict the fabric color better, but also reduce the average color difference of fabrics effectivelyon the basis of geometric models of fabric and Stearns-Noechel model.Fourthly, develop the fuzzy heald-saving design and color prediction of yarn-dyed fabricssystem. In the development environment of Visual Basic6.0, the CAD functions in the weavedesign and color forecasting are realized based on the mathematical model of fuzzy heald-savingdesign and the optimized Stearns-Noechel model. The result shows that: with the application ofCAD software, the complex images chosen by users can directly apply to the design of dobbyweaves and take the prediction of fabric color.Finally, verify the feasibility of the system. The polyester samples were interwoven bySGA598rapier loom according to the looming draft generated by the system, then comparing thefabric color values predicted by the system with which measured by spectrophotometerDatacolor. The results show that: with the weave diagram and looming draft on the basis of thefuzzy heald-saving design, it can not only reduce the number of harnesses, but also show nosignificant changes between the original pattern and actual fabric pattern; and the predict resultsof samples were accurate.