1. Definition of built up:
Lifting power is one of the important properties of disperse dyes. This characteristic means that when each dye is used for dyeing or printing, the amount of dye gradually increases, and the degree of color depth on the fabric (or yarn) increases accordingly. For dyes with good lifting power, the dyeing depth increases in proportion to the amount of dye, indicating better dyeing depth; dyes with poor lifting power have poor dyeing depth. When a certain depth is reached, the color gain will no longer deepen with the increase in dye usage.
2. The effect of built up on dyeing:
The lifting power of disperse dyes varies greatly between specific varieties. For dyeing deep and dense colors, dyes with high lifting power should be used, and for bright and light colors, dyes with low lifting rate can be used. Mastering the characteristics of dyes and using them reasonably can achieve the effect of saving dyes and reducing costs.
3. built up test:
The lifting force of dyes in high-temperature and high-pressure dyeing is expressed in %. Under the specified dyeing conditions, the exhaustion rate of the dye in the dyeing solution is measured, or the color depth value of the dyed sample is directly measured. The dyeing depth of each dye can be divided into six gears according to 1, 2, 3.5, 5, 7.5, 10% (O.M.F), and dyeing is carried out in a small prototype of high temperature and high pressure dyeing. The lifting power of hot melt pad dyeing or fabric printing is expressed in g/L.
From the perspective of production, the lifting power of the dye is the change of the concentration of the dyeing solution, that is, the change of the color depth relative to the finished dyeing. This kind of change can not only be measured unpredictably, but also can accurately measure the color depth value by means of the instrument, and then calculate the lifting force curve of the disperse dye through the calculation of the color depth formula.