What pigments are used in offset printing inks
Date: Aug 30 2024 From: Star Color
Offset ink is a type of ink used in offset printing, and its pigment selection has an important impact on the color, thinning, light resistance and other properties of the print.
As an indispensable material in the offset printing process, offset ink carries the key task of transferring patterns, text or other elements to the substrate accurately and clearly. Pigment, as an important part of the ink, not only determines the color, coloring power and chroma of the ink, but also affects its acid resistance, alkali resistance, light resistance, water resistance and other properties .
Types of Pigments in Offset InkPigments in offset printing ink are mainly divided into two categories: organic pigments and inorganic pigments.
1. Organic pigment: with high coloring power and bright color, it is widely used in printing ink. There are many varieties and complete colors, and their performance is better than that of inorganic pigments. Common organic pigments include benzidine yellow, phthalocyanine blue, azo color precipitation red, etc. 2.
2. Inorganic pigment: the color of inorganic pigment is relatively less vivid than that of organic pigment, and it is less used, but it has excellent light resistance, weather resistance and chemical stability. Common inorganic pigments include titanium dioxide, carbon black, iron oxide series and so on. These pigments in the ink mainly play the role of enhancing color saturation, improving ink covering power and so on.
Selection standard of offset printing ink pigmentWhen choosing offset printing ink pigment, the following criteria should be considered:
1. Transparency: Offset printing ink needs stacked color printing in the printing process, so the pigment is required to have a certain degree of transparency to ensure that the bottom layer of ink can be revealed through the upper layer of ink.
2. Weatherability: Printing products need to withstand the test of various environmental factors in the process of using, so the pigment is required to have good light resistance and weatherability to ensure the durability of the color of the printing products.
3. Dispersibility: the dispersibility of pigment in ink directly affects the printing performance of ink and the quality of printed matter. Therefore, when choosing pigment, we should pay attention to its dispersibility and wettability.
4. Environmental protection: With the improvement of environmental protection policy and consciousness, more and more printing enterprises start to pay attention to the environmental protection performance of ink.
The role of pigment in offset printing inkThe role of pigment in offset printing ink mainly includes:
1. rich color: through the combination of different kinds and ratios of pigments, colorful ink colors can be deployed to meet various printing needs.
2. good printing effect: high-quality pigments can give the ink good printing performance, so that the printed matter is colorful, layered and clear details.
3. Strong adaptability: pigments in offset printing ink can adapt to different printing processes and printing materials, such as paper, plastic film, etc.
4. Controllable cost: through reasonable pigment selection and proportioning, the cost of ink can be reduced under the premise of guaranteeing the printing quality, and economic benefits can be improved.
ConclusionThe pigment selection of offset printing ink has a decisive influence on ink performance and printing effect. By comprehensively considering the pigment's coloring power, hiding power, light resistance, weather resistance and other performance indexes, the formulation of offset printing ink can be optimized to improve the quality of printed products. With the development of printing technology and the improvement of environmental protection requirements, the development of new pigments and environmentally friendly inks has become an important direction for the development of the ink industry .
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