The effect of metamerism on packaging printing
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The phenomenon of metamerism has a great influence on the packaging of goods. For example, in the printing and packaging, many exquisitely printed boxes are ex-factory in color, accurate and correct, and found in the hands of major stores or users, but found that the color difference is large. These will make users suspect the authenticity of the goods, require return or even complaints, and the reputation of natural merchants is also damaged. In fact, this phenomenon is caused by the phenomenon of metamerism in printing, not counterfeit goods, but consumers do not understand the The reason, therefore, should pay attention to this problem in packaging printing.
The phenomenon of metamerism is difficult to avoid in packaging and printing, and can only be controlled. We know that the final color effect of printed matter in printing is determined by inks and substrates (such as paper), so they are also the main factors that produce metamerism, so pay attention to these two aspects. In terms of ink, as modern packaging printing develops in the direction of multi-color, anti-counterfeiting, etc., in addition to the basic colors of yellow, fine, green and black, there are more and more spot colors. Different batches of spot inks are prone to metamerism after printing, so pay special attention to this problem in the process of spot color ink, which is an important factor affecting quality. Also, ordinary four-color printing produces homochromatic phenomena due to the use of different batches of ink, although the conditions of the printing color sequence are the same. Therefore, regardless of spot color or four-color printing, the same batch of ink of the same brand should be used as much as possible. When the metamerism is found, it should be promptly reported to the supplier to provide the same ink to minimize or control the metamerism. phenomenon.
However, in the actual packaging and decoration printing, there will be a certain color difference from the three primary color inks with the spot color or the three primary color dot area ratios and the spot colors. For packaging and decoration printing, the copy should be allowed to have a color difference with the standard sample (original) when it is matched with the same color, but the color difference between the copy and the original should be controlled as much as possible to limit it to the specified allowable range. Inside. In terms of paper (especially colored paper), the nature of the paper has a great influence on the color of the ink printing, that is, the same ink is printed on different papers to produce different color effects. The main factors affecting the color difference of ink printing are paper whiteness, brightness, and absorption. The difference in performance such as paper color also produces metamerism. Therefore, it is very important to produce the same color and the same performance parameters as the standard when producing paper. However, due to the current quality control of papermaking enterprises, most of them only use the color difference value under one observation condition to evaluate the degree of color of color, regardless of the problem of metamerism. Therefore, in printing, a product should use the same batch of paper of the same manufacturer as possible to reduce and control the metamerism caused by the paper. When viewing with the customer, the observation color and the sample must be carried out under the same standard light source to avoid color deviation caused by different light sources, which should be paid attention to in printing.