Industrial color science and material aging training

On October 27th, Suzhou Guangmingfa Trading Co., Ltd. and Q-Lab Corporation jointly held a seminar on industrial color science and common color problems, weathering test and related test standard application interpretation. The content of the meeting mainly included two aspects, one is Explained the knowledge of industrial color science, one is the introduction of the nature of material aging and testing technology.

In terms of industrial color science, the current industry test color difference value uses the CIEL*a*b* formula, but this formula has certain shortcomings. When measuring the color difference of high chroma colors, it will appear to be in poor agreement with the human eye. For example, for two samples with high chroma, the color difference observed by the human eye is small, but the color difference value is large when measured with a spectrophotometer.

Due to the uneven color space uniformity of the CIEL*a*b* formula, it is necessary for companies to set different allowable rejection values for different colors during the allowable rejection setting, which will cause trouble and trouble for the company's product testing. . For this problem, a new color difference formula is slowly replacing the CIEL*a*b* formula. The formula is ΔE*94=[(ΔL*/KLSL)2+(ΔC*/KCSC)2+(ΔH) /KHSH) 2】1/2.

In terms of material aging, it mainly includes xenon lamp aging and ultraviolet fluorescence aging. Xenon lamp mainly simulates sunlight, and ultraviolet mainly simulates ultraviolet light that damages materials in sunlight. In terms of aging, the main concern is that the time of the aging test corresponds to a few years of actual use conditions. However, there is no fixed acceleration factor for the corresponding relationship. A more feasible method in the industry is to calculate the cumulative exposure, which is compared with the Florida standard for one year. The amount of illumination is 280MJ for comparison. Another method is to conduct a comparative test. Use materials with known weather resistance as a control for comparison test. (Technical Quality Department)