As we all know, color matching light boxes can enable samples, production, quality inspection, and acceptance to be carried out under the same standard light source, and can accurately correct the color deviation of goods, and can be used in textiles Visual assessment of the color fastness of materials in printing and dyeing industries, color matching proofing, identification of color differences and fluorescent substances, etc., to ensure that the color quality of the goods meets the requirements, thereby improving product quality and market competitiveness.
Color-matching light boxes are usually a combination of multiple light sources, such as D65, D75, and D50 that can provide simulated daylight. , simulated store showroom lighting TL84, CWF, U30, as well as home lighting F, INCA, horizontal daylight HORIZON, ultraviolet tube UV, etc.
These light sources must be approved by large international institutions, such as store lighting approved by Wal-Mart and Martha, international testing Daylight approved by the organization, lights with various special requirements specified by merchants, etc.
We encountered many problems when using standard light boxes. Some of them caused misalignment of the color of the light boxes due to some details. Failure to comply with standards will cause adverse effects on subsequent production.
Below are 7 key steps for using a standard light source box. If you encounter similar problems, you may wish to refer to them. one time.
1. Standard use:
Key step one: observation angle
According to international standards, only two viewing angles can be used, they are:
a , Zero-degree light source, 45-degree observation (0°-45°), that is, the light source shines on the sample from a zero-degree (vertical) incident angle, and the observer observes the sample from 45 degrees.
b. Light source, 45° inclined platform. 45 degree light source, zero degree observation (0 °-45 °). In this layout, a specific 45 ° Fixed angle table must be used to make the light source shine on the sample from 45 degrees, and the observer from zero degree (vertical) observe the sample.
Key step two: 45° light source to detect the placement of the sample
Regardless of using any of the above observation methods, it must be noted that the test sample is placed in the middle of the light box as much as possible to reduce the influence of external light sources. In addition, it is important that when you need to compare the colors of two or more objects, you should try not to overlap them for observation. It is best to place them side by side for comparison.
Key step three: Environmental factors when comparing colors
All external light that will have the opportunity to shine on the test sample must be avoided as much as possible. If the window is within the field of view, gray curtains should also be installed to block it, so it is ideal to use a color-matching light box in a dark room. of.
Another point that is often overlooked is that no other debris should be placed in the opposite color light box.
Key step four: requirements for converting light sources
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Based on daily life experience, in our eyes, it is like having a temporary register. When the color changes in a very short time, we can clearly feel it. Got.
Therefore, when observing metamerism, if you want to change the light source, it must be done in an instant. It must not be like the lighting tubes we use every day, which have to flash and then turn on, because this will irritate the eyes and affect the evaluation results.
Key step five: Have the function of testing metameric effects
The so-called metamerism effect means that under a certain light source, the color displayed by the sample is the same as the required color, but under another light source, its color is the same as the required color. Color differences are not acceptable. Under the D65 light source, there is no difference between the color and the standard, but under the A light source, the color of the sample is unacceptable. Therefore, all equipment that measures color light sources must be equipped with two or more light sources to test the metamerism effect.
Key Step 6: Arrangement of Lamps
Although there are no specific requirements for the arrangement position of the light tubes, their distribution position must be such that there is a uniform light source in the opposite color light box, and they must not be skewed to a certain area.
Key Step 7: Record the time spent on standard ordering
All standard color-matching light sources are also produced by lamp tubes or lamps, and manufacturers will also list the operation time of their products. The quality of its products remains within acceptable tolerances. Therefore an accurate time recorder is indispensable. Usually these tubes need to be replaced if they are used for more than 2000 hours or a year.
2. Daily maintenance:
1. The selection of various light sources in the color matching light box is controlled by the touch buttons corresponding to the names of the light sources on the box to achieve quick switching and rapid lighting. Place the two items that need to be compared for color deviation in the color matching light box. The central symmetrical position is the best observation angle as long as the angle between the human eye or light and the object being measured is 45 degrees.
2. When using a light box, try to avoid external light from shining on the items to be detected, and at the same time, no light should be allowed inside the light box. Place other debris.
3. After the color-matching light box lamp is used for more than 2,000 hours, it must be replaced with a new one. In order to avoid the effect of visual observation of color due to the aging of the lamp tube.
4. If the inner wall panel of the light box is stained, you can use a clean soft cloth dipped in a low concentration of alkaline to clean it. Wipe it clean with a wiping agent to keep the inner frame clean and dry to prevent the detection items from damaging the light-absorbing coating on the inner wall of the light box and affecting the color matching effect.
5. If the inner panel of the light box is damaged and cannot absorb light, it should be replaced. If the lamp is used overtime and causes blackening and aging at both ends, the lamp should be replaced with a new one.
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