Interpretation of the Operation Sketch of Light Box

The light box is an indispensable tool for color evaluation, color quality control, and color contrast. Light box light source for the color evaluation to provide a good observation environment, help to improve product quality, access to domestic and foreign textile certification bodies and processing companies unanimously approved. The following is the operation of the light box light tips: 

Detection angle: In addition, the detection angle will directly affect the review results. According to international standards, only two detection angles can be used, they are:45 ° ramp: 45 degrees light, zero detection (45 ° - 0 °)In this layout, a specific 45 degree fixed angle table (45 ° Fixed Angle Table) is used to illuminate the sample from 45 °, and the test is tested from zero (vertical).Zero light source, 45 degrees detection (0 ° - 45 °)That is, the light source is irradiated on the sample from the zero (vertical) incident angle, and the detector detects the sample light source from 45 degrees

 Lightbox maintenanceA perfect maintenance plan, in order to ensure that your color assessment cabinet for a long time in the standard state: such as the use of careful not to fouling the inner wall of the light box; if found to have stains or paint peeling, they should immediately send personnel to amend or replace the inner wall, and often Check the use of lamp time or brightness and so on.

 Check the placement of the sampleRegardless of the use of any of the above detection methods, it must be noted that the test sample as far as possible in the middle of the light box to reduce the impact of external light source. In addition, the most important thing is to compare the color of two or more objects, it should try not to overlap them to watch, it is best to side by side on the light box with the comparison.

Have the function of testing the same color (Metamerism) effectThe so-called heterochromatic effect, that is, in a light source, the sample shows the same color and requirements, but in another light source, the color difference can not be accepted.

We can see from the figure the same sample, in the D65 light source, the color and the standard is no difference, but in the A light source, the sample color can not accept. Therefore, all the equipment for the color light source, must be equipped with two or more light sources to test the same color effect.

 Implementation of the environmental requirements of the color requirementsAll will have the opportunity to irradiate the test sample on the external light must be avoided, such as windows in the field of vision, should also be fitted with gray curtains to cover, so the use of color in the dark room is the most ideal light box. Another point is often overlooked, that is, the color assessment cabinet can not be placed on other debris. 

Requirements for converting light sources (instant-on -Quick Starter)According to the experience of daily life, in our eyes, like a temporary register, when the color changes in a very short time, we can clearly feel the. Therefore, in the detection of the same color spectrum, if you want to change the light source, it must be completed in an instant, do not like our daily use of the same light tube, to flash after the light will be lit, because it will stimulate Eye, affect the results of the review. 

Record the time the standard lamp is usedAll standard color light sources are also produced by bulbs or bulbs, and the manufacturer also states that its products are maintained within acceptable tolerances within a number of hours of operation. So an accurate time recorder is indispensable. Often this lamp is replaced if it is used for more than 2,000 hours or a year. 

The arrangement of the lampAlthough the arrangement of the lamp position and no specific requirements, but the distribution of the location must be in the light box has a uniform light source, must not be a side of a side.

Ultra-Violet IlluminantDue to the widespread use of industrial, fluorescent and whitening dyes, the best way to detect these effects is to use a UV lamp because the ultraviolet light is exposed to a fluorescent agent to produce a significant brightness Change, so that the naked eye can easily detect out.