At present, the color matching methods of spot color inks are mainly divided into two types: traditional spot color ink color matching and computer spot color ink color matching. Based on the summary of the research experience of the offset printing ink color matching technology, some suggestions are made for the spot color ink matching technology for peer reference.

Traditional spot color ink color matching method

The traditional spot color ink color matching method is based on the skills and experience of the operator for many years, and the color matching is carried out through observation and comparison. It is generally suitable for small packaging and printing companies with low color requirements. However, in the process of use, many companies report that even if the color matching method is used reasonably, the color difference between the printed product and the original is still large, and the defective rate is high, which seriously affects normal production.

It is understood that when comparing spot colors configured with the traditional spot color ink matching method with the original spot colors, the general practice is to first manually match the ink and then compare it with the original spot colors. In fact, this approach is unscientific. Because the uniformity and thickness of the ink layer greatly affect the color effect of the spot color ink, when the ink color after the ink is not much different from the original color, the operator will mistakenly think that the spot color ink has been prepared and will start Printing, the result is that the color difference between the printed product and the original is far away. In this process, the traditional spot color matching method is combined with the mechanical ink leveling mechanism, which can reduce the color difference of the print caused by the misjudgment of the master.

In addition, the effect of paper on the color matching effect of traditional spot inks cannot be ignored. Papers of different materials have different color rendering effects on printed products. In the process of pattern making and comparison with originals, paper of the same material as the printed materials needs to be used.

Even with this improvement, the metamerism phenomenon may occur due to the wrong color. The two color print samples look the same under one light source, but show a difference under the other light source. Therefore, Hengsong recommends that if conditions permit, try to use computer spot color ink to match colors

Hengsong computer special color ink color matching method

Large packaging and printing companies with high color requirements usually use computer spot color ink color matching method when matching colors. The principle is to first use a spectrophotometer to measure the target color. After processing by the computer color matching software, the color information of the target color is expressed in the form of objective data, and then the basic color data stored in the database is used for color matching. Spot color ink formula close to the target hue. When there is a large color difference between the copied color and the target color due to the influence of raw material properties and process parameters, the computer color matching system will automatically correct the used formula and control the color difference within the allowable range.

In order to restore spot color colors more efficiently and accurately, it is necessary to optimize the computer spot color ink color matching technology, and pay attention to the following points:

(1) The primary color sampling must be accurate, otherwise it will directly affect the color matching effect. Therefore, when establishing the basic color standard, it must be strict and meticulous, and try to exclude the interference of all external factors.

(2) Ensure the stable transfer of ink. Many experiments have found that if the ink printing machine is used to print the ink color samples directly, the thickness and uniformity of the ink on the color samples cannot meet the high color requirements of large packaging and printing companies. This is mainly because the ink is too thick and has poor fluidity. As a result, the ink transferability is reduced and the color difference is large, which further affects the accuracy of the primary color sampling. Before the pattern is made, the ink needs to be placed in an oven at 100 ° C and used after cooling for half an hour, which greatly increases the fluidity of the ink and makes the ink transfer better. In addition, the ink must be weighed accurately and cleanly when it is weighed to avoid the impact of ink stripe floating and flowering on ink transfer.

(3) The substrate must be selected from the substrate. A part of the substrate is stored in the computer after measurement, and the other part of the substrate is used to make the base color sample.

(4) General principles and precautions for sample preparation: the sample must be made by the same person, and the method must be the same; the ink for making a set of base color samples must be weighed at one time; the production conditions of the base color samples should try to simulate the production process Conditions, types of additives, dosage, time, temperature and post-treatment conditions must also be similar to production conditions.

(5) Try to choose the least type of ink for color matching, because the less the type of ink, the better the mixing effect and the saturation of the ink color.

(6) In the color matching process, try to choose the ink of the same manufacturer or the same series, otherwise it will produce uneven coloring, and the ink will agglomerate and be scrapped when it is serious.

(7) Make sure that the rubber roller of the IGT proofer is intact and clean. This has a greater impact on the accuracy of the sample. When measuring the sample data, three test points at different positions can be taken on the same sample to measure separately, and finally the average value is taken.

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