The application of Colorimeter in paint, spraying and ink color matching

Colorimeter is also called portable colorimeter, color analyzer and color colorimeter. The colorimeter is a simple color deviation testing instrument, that is, to make a filter that simulates the spectral characteristics equivalent to the color sensitivity of the human eye, and use it to measure the light of the sample plate. The key is to design the spectral sensitivity characteristics of this photosensitive device, and can measure and display the excellent difference through the computer software under a certain light source. It is a conventional instrument for scientific research and production, as well as a high-tech product integrating colorimetry, modern optoelectronics and computer science.

Main applications of colorimeter:
01. Product quality of color control
When the product is put into production, due to the changes of many factors in production, color deviation may occur in batch products
In order to control the color change of the product within a certain acceptable range, the production line must use a color change instrument to detect the color quality to monitor the color change of the product. Within the acceptable range, the production process should be adjusted to ensure the color quality of the product. Many factors often occur in the production, resulting in the deviation of product color. Therefore, the color-difference instrument should also be used to continuously detect and adjust during the production process; Before leaving the factory, the finished products and incoming samples or color cards shall be taken for inspection to ensure the conformity of the products produced.

For example, the mobile phone case (as shown in the figure below) needs to use a color difference meter to check whether the color is qualified when it comes to incoming materials.
For example, plastic parts shall not be deformed or twisted (more than 10mm is not acceptable);
The color of plastic parts shall be consistent, free of impurities, color difference, etc;

02. Color matching, painting, printing ink, etc.
When receiving the customer’s standard sample, the company shall assign colors according to the standard sample. In this process, the low sample should be repeated. When there is no instrument to measure the color difference between the standard sample and the sample, the color difference between the evaluation sample and the standard sample basically depends on the human eye. Due to the subjective factors of the human eye, there are some problems, for example. Long calibration cycle, high calibration cost, low color accuracy, and difficult color difference data. At this time, the difference between the small sample and the standard sample can be measured by the color difference meter, and the color difference of the sample can be determined according to the difference to determine whether it conforms to the range, which can reduce the uncertainty of human eye observation.

Here is an example:
If the color coordinate of the standard sample is:
L *=22.75, a *=22.58, b *=13.83 (i.e. (L) brightness value is 22.75, (A) red is 22.58, (B) yellow is 13.83)
Set the measured value of the standard sample as the standard, and then measure the sample to get the result of the sample:
L*=22.88，a*=20.32，b*=10.85；
Δ L*=0.13， Δ a*= -2.26， Δ B *=-2.95 (light 0.13, green 2.26, blue 2.95)

It can be seen that the next time you modify the sample formula, you should add red (or minus green) and yellow (or minus blue). You can determine the degree of addition according to the test results. Repeat several times until the color difference is within the allowable range. An experienced color mixing master can determine the proportion of the formula between 2-3 times according to the value of the color difference meter.

Croatia deviation measurement can quickly measure the color difference between standard samples and samples, provide accurate quantitative data, fast and comfortable, and reduce the uncertainty of human eye observation. The color deviation between the sample and the standard sample can be displayed in the measured data of the color difference meter. Therefore, the color formula can be corrected according to the measured data of the colorimeter to shorten the correction period.

03. Color transfer
The international and domestic color is based on the ideal black and white board, not the instrument. Therefore, when customers hear about color cards or standard samples, they can use a color difference instrument for color matching and color quality control, so as to accurately realize color reproduction
Q: What should I do if the colorimeter doesn’t work when I use battery power?
A:1. This phenomenon indicates that the battery power is insufficient and the colorimeter needs to be powered; (Plug in the power adapter or replace the battery)
2. If not, you can unplug the power adapter and plug it in again to see if it can be turned on, or plug and unplug the power adapter several times.
3. If the above methods do not work, replace the battery.

Problems encountered by colorimeter and solutions:
Q: What should I do if the results measured by the colorimeter are abnormal?
A: 1. This situation is generally caused by the lack of black-and-white correction or inaccurate black-and-white correction. It is necessary to carry out black-and-white correction first.
2. Dirt entering the measuring port will also cause inaccurate measurement. It is better to check before measurement;
3. Check whether the battery consumption is too low (less than 20%), replace it with a new dry battery or use a DC power supply.
4. Check whether the instrument and test object are stable during the measurement, and whether the contact between the measuring port and the measuring surface is tight and good
5. Check whether the measured object is too thin and light leakage
6. Check whether the measured part is mixed
7. If the measurement results are still zero after black and white board correction, it can be judged that the instrument is broken.

Q: What should I pay attention to when using the colorimeter?
A: 1. This instrument is a precision measuring instrument. During the measurement, avoid the drastic changes in the external environment of the instrument. For example, avoid the flicker of the ambient light during the measurement.
2. This instrument is not waterproof and cannot be used in high humidity environment or water mist.
3. Keep the instrument clean, avoid water, dust and other liquid, powder or solid foreign matters entering the measuring caliber and inside the instrument, and avoid impact and collision on the instrument.
4. If the instrument is not used for a long time, remove the battery.
5. The power adapter other than the company’s special power adapter cannot be used, otherwise the instrument may be burned.
6. After the instrument is used, put the colorimeter and whiteboard cover into the instrument box and keep them properly.
7. The instrument should be stored in a dry, cool and environment. To avoid damage to the instrument.

Portable Colorimeter/Chroma Meter is an innovation color measuring tool with powerful configuration to make color measurement easier and more professional; It support Bluetooth to connect with Android and ISO devices, Portable Colorimeter/Chroma Meter will take you into a new world of color management; It can be widely used to measure color value, color difference value and find similar color from color cards for printing industry, paint industry, textile industry, etc.

CD-320PRO_Portable Colorimeter/Chroma Meter

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

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