The American PANTONE color standard certification is to describe the colors in a unified and clear way in digital language, which provides a convenient and fast color scheme and color standards for the packaging and printing industry and the ink manufacturing industry. In the developed ink industry countries in the world, the ink color for packaging, publishing and printing has widely adopted the unified spot color standard of American PANTONE, which is convenient for users and stable in quality. The rapid development of the packaging and printing industry has put forward new requirements for color design, so it is particularly important to ensure the consistency and stability of the color of printed batches.
In order to cater to the development of the market, ink manufacturers and packaging and printing companies need to have an understanding of the basic characteristics and preparation methods of spot color inks, and should be able to apply them proficiently to meet the market's color requirements for packaging and decorating printed products, so that our customers Enterprises take the lead in the fierce market competition and continue to expand market share. First let us understand-the difference between PANTONE spot ink and ordinary ink
1. Color characteristics of PANTONE basic color ink
PANTONE basic colors are pure primary color inks. They are formulated with a single pigment (or colorant) at a high percentage content. They have extremely high color density and color purity. PANTONE's 14 basic colors are no exception.
Basic color name Pigment index number Pigment content (%)
PANTONE Warm Red C PR-57: 1 21.00
PANTONE Orange 021C PO-34 17.10
PANTONE Red 032C PR-11 17.60
PANTONE Light Blue C PB-61 17.00
PANTONE blue 072C PB-1: 2 17.00
PANTONE Blue Purple C PV-3 22.10
Because PANTONE ink uses a single pigment to prepare the basic color, it has the distinctive characteristics of pure color, vivid, high density, small color difference, and high color matching accuracy.
2. Color characteristics of ordinary color offset printing ink
At present, sheet-fed offset printing inks produced by major domestic ink companies can be roughly divided into two types: resin offset printing inks and bright fast-setting resin offset printing inks. Due to the different formula design of each manufacturer, the color density of the ink is different; and because of the differences in the sales areas and usage habits of the manufacturers, and there is no unified color standard, although the color is complete, the ink density is different. In view of the above, when selecting printing inks with high color requirements, PANTONE basic color inks can be used. At present, nearly 10 offset printing ink manufacturers in China have passed the US PANTONE licensing certification. It is very convenient to purchase PANTONE basic color inks in China. As long as the color is adjusted according to the color matching guide of the PANTONE color card, the color of the printing ink can be guaranteed. [next]
3. Performance comparison of PANTONE basic color ink and ordinary color ink
1) Dryness of ink
There are two main methods of drying offset printing inks: fixed drying and oxidized conjunctival drying. Fixation drying is generally called initial drying, which means that the printed parts do not stick to each other after the ink is transferred to the paper. The time taken is called the initial drying time. Oxidized conjunctival drying refers to the process of chemical change from the initial drying to complete drying of the ink film from colloid to solid. The time consumed is called the drying time of the oxidized conjunctiva. The drying speed of these two drying methods is directly related to the ink formulation design. Ordinary resin offset printing inks have slow fixation drying and oxidative conjunctive drying time, which is not suitable for the preparation of PANTONE spot color inks, while the bright fast-setting offset printing inks can be adapted to the preparation of PANTONE spot color inks.
2) Ink density
The concentration of PANTONE basic color ink is high, and the ordinary ink needs to be printed on the dark field twice. If PANTONE basic color ink is used, it can not only be completed at one time, but also can show the effect of "deep ink light printing". It is not easy to be dirty and suitable for smoke. Printing of wine, cosmetics, poker and other packaging boxes. The concentration of ordinary resin offset printing ink is low, and the drying speed is slow, so it is not suitable for mixing PANTONE spot color ink in field printing. The density of the three primary colors of bright light fast setting ink basically meets the requirements of PANTONE color density.
3) Other performance evaluation
The formula design of PANTONE basic color has greater flexibility. The formula design can be considered according to the different paper and post-press processing. Especially for cigarette pack products with high wear resistance, PANTONE basic color ink can also be added 3% ~ The 5% fluorine-containing polymer compound significantly improves the wear resistance of the ink without affecting the concentration of the ink.
The basic color ink can also adjust the viscosity, fluidity and dryness of the ink according to the paper's ink absorption and surface smoothness. The control of drying is mainly to use organic acid salts to adjust the drying speed of the middle and bottom layers of the ink. At the same time, non-skin ink can also be made with phenolic antioxidants. In short, the high concentration and high purity of PANTONE basic color ink pigments bring great flexibility to our formula design.
In addition, in the quality standards of ordinary resin offset printing inks and bright quick-setting resin offset printing inks that have been formulated by the country, the direct use performance as a commodity is considered more, and the flexibility and adaptability of the ink redeployment are not emphasized enough, so In the preparation of PANTONE light color ink, the main color ink is often impure. If it is diluted with transparent white ink and does not meet the requirements of PANTONE standard color, it will cause color cast. This is inevitable.
In summary, there are certain differences in the characteristics of PANTONE basic color inks and ordinary color inks. When formulating spot color inks, we can use strengths and avoid shortcomings according to the characteristics of various types of inks. Key points for deployment. [next]
Before deploying PANTONE spot color inks, you must understand the blending of several basic inks.
1. The deployment of light-colored ink
Transparent white is a translucent colloid with offset printing ink properties made by mixing and dispersing about 25% to 28% of translucent nano-calcium caustic soda and resin oil. It has the technology of PANTONE basic color ink Characteristics, it will not affect the printing performance in any proportion, and the color is light and odorless, with good fixing drying power and post-print gloss. Transparent white has the following characteristics:
â‘ High transparency and light color, suitable for multi-color overlay printing;
â‘¡ Has good fluidity, elasticity and mixing;
â‘¢ Fast drying speed, high gloss and good storage stability.
Many printing companies still use traditional white ink to mix light-colored ink, but the color effect is not very good, because white ink is produced by achromatic pigments, the content of powdered pigments is usually 60% to 70%, the composition of the linking material is relatively less. The light-colored ink formulated with white ink has the disadvantages of large specific gravity, poor transfer performance, and easy emulsification; low gloss, poor light resistance, and easy powdering; strong decolorization, and high hiding power. Therefore, it is recommended that printing companies use transparent white as much as possible when mixing light-colored ink. It is best not to use white ink or use it in proportion to transparent white.
2. The deployment of dark ink
Dark ink refers to the relatively high concentration of ink with less transparent white content, mainly made of color ink. In the preparation of dark ink, the general prints can be adjusted according to the formula ratio of the PANTONE color matching guide, but some products with special colors and technical performance requirements need to be adjusted. For products that require high color density and need to be printed twice, due to the thick ink layer, the back of the print is easy to be dirty. You can choose to use fast-drying ink, or add some red dry oil in an appropriate amount. Drying agent and anti-sticking agent (provided by professional ink company) for the middle and bottom layer, choose paper with good absorption, and reduce the machine speed and increase the powder spraying when printing. In addition, when distributing dark blue ink with a high blue light component, it should be noted that the blue light chemical structure contains antioxidant groups, and the principle of first trial printing and later production should be adopted to prevent poor drying of printed products.
3. Process requirements
The preparation of PANTONE spot color ink must consider the post-press processing technology. For products that require lamination and water-based glazing after printing, less wax removal and anti-wear additives should be added during ink adjustment. Although anti-wear additives are added, It can make the ink film smooth and wear-resistant, but it will change the surface structure of the ink layer, which is not conducive to water-based glazing and coating. If the amount of red dry oil is excessive, the ink will dry and crystallize quickly, which will result in poor coating and gloss. In addition, when preparing spot color ink, the proofing paper provided by the printing manufacturer must be consistent with the printing paper to prevent excessive color difference. The application of spot color ink should also consider the application characteristics. For inks used for large-area field printing, the viscosity should not be too high, and the viscosity is high, which can easily pull the paper wool and make the ink film surface uneven. Also consider the season, the viscosity is lower in winter and relatively higher in summer. From the perspective of the application performance of spot color inks, the accuracy of ink colors is the most important. Therefore, it is best to use PANTONE basic color inks to formulate spot color inks. The formula prepared with PANTONE basic inks is very versatile and can guarantee the ink index . Listed below are two commonly used PANTONE spot color ink matching methods-PANTONE color matching method. [next]
1.PANTONE color card contrast method
The PANTONE color matching guide contains 1114 kinds of PANTONE spot colors, which are printed on glossy coated paper and offset paper, and fan-shaped binding. It provides users with a convenient choice in selecting and comparing references. All color labels are marked with PANTONE color names below (Number) and the matching ratio, all colors are made up of a set of 14 standard basic color inks and transparent white. When receiving the customer's standard color sample, you can directly compare with the PANTONE color card color guide to find a relatively similar color standard, and then determine the hue according to the actual color difference, find out the main cause of the color difference, and then according to the judgment result Mixing ink is convenient and practical.
2. Weighing method
When receiving the customer's standard color sample, you can first make a preliminary comparison according to the PANTONE color card, find out the relatively similar PANTONE number color code, according to its basic color, use the 1/100 precision medical balance to carry out the matching test of the formula. The color of PANTONE color mark is usually composed of 2 to 4 basic colors. The basic color ink can be weighed according to the proportion, and the weight can be more appropriate, and the name and weight of each basic color ink should be marked. . Each basic color ink is taken out according to the PANTONE ratio by the decrement method, placed on a glass plate (40cm × 60cm, electric heating is better), and mixed evenly before mixing.
The prepared ink is printed with a certain amount of ink using an IGT tester, compare the printed sample with the standard color sample, and repeat the color until it is consistent with the standard color sample, and then weigh the weight of the basic color ink remaining in the sulfuric acid paper The consumption of each basic color ink is converted into a percentage. This method is called recipe reduction method. In this method, the more printing times in operation, the greater the error in the consumption of basic color ink. In order to improve accuracy, the formula can be weighed again according to the converted percentage and verified again. The accuracy of the obtained formula is relatively high. This method is suitable for the preparation of PANTONE spot color ink, as long as you have a certain chromatic foundation and weighing knowledge, you can quickly master the color matching law.
With the deepening of China's opening to the outside world and the integration of Eastern and Western cultures, the demand for the preparation of various spot color inks is increasing. It is an inevitable trend to use the PANTONE color system as the color standard. One of the faster methods. Colleagues in the printing and ink industry should work together to meet the challenges of new technologies and make full use of PANTONE color matching methods to continuously innovate. Recently, PANTONE has newly launched color pearlescent, metallic and high-fidelity six-color printing ink standards. These new varieties contain updated ink matching ideas, which are worthy of our joint research and exploration.
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