As we all know, color light boxes can make samples, production, quality inspection and acceptance under the same standard light source, accurately check the color deviation of goods. They can be used for visual evaluation of color fastness of materials in textile, printing and dyeing industries, color matching proofing, identification of color deviation and fluorescent substances, etc., to ensure that the color quality of goods meets the requirements, thereby improving product quality and market competitiveness. 。
The color matching lamp box is usually a combination of various light sources, such as D65, D75, D50, TL84, CWF, U30, family light F, INCA, horizontal daylight HORIZON, ultraviolet lamp tube UV and so on. These light sources must be approved by large international organizations, such as Wal-Mart, Martha approved store lights, sunlight approved by international testing agencies, light specified by customers with special requirements, etc.
There are many problems in the use of standard light source boxes, some of which do not meet the standard because of some details, which has a negative impact on subsequent production. Here are seven key steps for using standard light source boxes. If you encounter similar problems, please refer to them.
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1. Standard use:
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Key Step 1: Observation Angle
According to international standards, only two observation angles are available. They are:
A. Zero light source, 45 degree observation (0 & deg; - 45 & deg;) that is, light source from zero (vertical) incidence angle on the sample, the observer from 45 degree observation sample.
B, light source, 45 & deg; inclined platform. 45 degrees light source, zero observation (0 & deg; - 45 & deg;), in this layout, the use of a specific 45 degrees inclined table (45 & deg; Fixed angle table) so that the light source from 45 degrees on the sample, the observer from zero (vertical) to observe the sample.
Key step 2: 45 & deg; placement of light source detection samples
Regardless of any of the above observation methods, it must be noted that the test sample should be placed in the middle of the lamp box as far as possible to reduce the influence of the external light source. In addition, the most important thing is that when we need to compare the color of two or more objects, we should try not to overlap them and observe them. It is better to place them side by side for comparison.
Key Step 3: Environmental factors in color matching
All external light that will have the opportunity to shine on the test sample must be avoided as far as possible. If the window is in the field of vision, it should also be covered with grey curtains, so the use of color matching light box in the black room is the most ideal. Another point that is often overlooked is that the color light box must not be placed in other sundries.
Key Step 4: Requirements for Switching Light Sources
According to our daily life experience, in our eyes, it is like having a register. When the color changes in a very short time, we can clearly feel it. Therefore, in the observation of homochromatic spectrum, if we want to change the light source, we must complete it in an instant. We must not be like the lighting tubes we use in daily life, but only after a flash, because this will stimulate the eyes and affect the evaluation results.
Key Step 5: Function of testing homochromic and hetero-spectral effects
The so-called isochromatic effect means that under one light source, the sample shows the same color as required, but under another light source, the color difference can not be accepted. Under D65 light source, the color is not different from the standard, but under A light, the sample color is unacceptable. Therefore, all the equipment of color matching light source must be equipped with two or more light sources to test the homochromic effect.
Key Step 6: Arrangement and Position of Lamps
Although there is no specific requirement for the lamp arrangement position, its distribution position must be in the color lamp box with a uniform light source, must not be on the side of a certain area.
Key Step 7: Record the time used for standard customization
All standard alignment light sources are also produced by lamp tubes or cannons, and the manufacturer will specify that the quality of its products will remain within acceptable tolerances for a number of times of operation. Therefore, an accurate time recorder is indispensable. Usually these subscribers need to be replaced if they are used for more than 2000 hours or a year.
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2. Daily maintenance:
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1. The selection of various light sources in the color light box is controlled by touching keys on the corresponding light source name on the box body. To achieve fast switching and lighting, two objects with color deviation will be placed in the central symmetrical position of the color light box. As long as the angle between the human eye or light and the object under test is 45 degrees, the best observation angle is obtained.
2. When using the light box, we should try our best to avoid the outside light shining on the detected items. At the same time, other sundries should not be placed in the light box.
3. After more than 2,000 hours of use, new light tubes should be replaced to avoid the effect of visual observation of color caused by the aging of light tubes.
4. If the inner wall of the lamp box is stained, it can be wiped clean with clean soft cloth dipped in alkaline low concentration detergent to make the inner frame clean, dry and avoid damage to the light absorbing coating of the inner wall of the lamp box by testing articles, which will affect the color effect.
5. If the inner panel of the lamp box is damaged and can not absorb light, it should be replaced. The new lamp should be replaced when the two ends of the lamp are blackened and ageing due to the overtime of lamp use.
Do you know the difference between D65, CWF, TL84 and U30?
Light source, no longer worry: there are many common light sources in the printing and dyeing industry, such as: D65, A, C, D50, D55, D75, F 1, F2, F3 in color matching software at home and abroad.It is often used. So many light sources, so that some fabric manufacturers and dyeing and printing factories feel prone to work errors and lead to returns.
CWF, WWF, TL84, U30, HOR are commonly used commercial light sources in the world.
When the relative spectral power distribution curve of some light sources is close to that of a particular illuminator, these illuminators can be used to describe some typical important light sources. For example, D65 denotes average sunlight, A denotes tungsten filament lamp, F2 denotes CWF, F11 denotes TL84, etc.
If we choose the most suitable color measuring and matching instrument?
If color matching is required:
UltraScan PRO integral spherical spectrophotometer is selected. It is 350-1050 nm wide and 2 nm spectrophotometric report is 5 nm. It has white board, green board and neodymium-praseodymium filter standard data with international standard organization. There are 1024 sets of silicon light-emitting diode arrays with double light paths. The sensitivity is very high. It can be equipped with various high-end color matching software. It can measure color fastness, homochromic spectrum, staining, whiteness, various color differences, black card discoloration and so on.
If it is a fluorescent product:
Choose LabScan XE or ColorFlex EZ, in accordance with EN471, 45 & deg; / 0 & deg; or 0 & deg; / 45 & deg; structure, measurement is the same as human eye. It can measure color fastness, homochromic spectrum, staining, whiteness, various color differences, black card discoloration and so on.
If quality control is required:
Choose 45 & deg; / 0 & deg; or 0 & deg; / 45 & deg; LabScan XE or ColorFlex EZ of the structure, or Digieye electronic eye products. Digieye writes the latest ISO test standard to measure the color of lace as small asFor printing, complex color mixing, lace and other color measurement has a very good application. It can measure color fastness, homochromic spectrum, staining, whiteness, various color differences, black card discoloration and so on.
