Requirements of Different Printing Materials for Ink
Release Date:
2025-08-27
Newsprint: The relief printing ink used for newsprint is a very thin, low-viscosity, and highly fluid ink, whose fluidity depends on the speed of the printing machine. Its drying is entirely absorption and penetration drying. Nowadays, news printing has been replaced by rotary offset printing from relief printing, and flexographic printing is also used in news printing, with water-based inks being widely used in flexographic printing.
1. Newsprint: The relief printing ink used for newsprint is very thin, has low viscosity, and flows very well. Its flowability depends on the speed of the printing machine. Its drying is entirely through absorption and penetration. Nowadays, news printing has been replaced by rotary offset printing instead of letterpress printing, and flexographic printing is also used in news printing, with water-based inks widely used in flexographic printing.
2. Uncoated paper: The quality of uncoated paper varies, and the inks used must also meet the requirements of various papers. Usually, viscous inks are used for printing, but they are thinner than those used for coated paper. The drying method relies on penetration absorption and oxidative film formation.
3. Paperboard: Paperboard is usually used for making paper boxes, cartons, printed packaging, hardcover book covers, etc. In printing, the ink requires good flowability, low viscosity, and must withstand mechanical forces such as collisions and ink rubbing during handling. All printing methods can be used on paperboard: oxidative film drying letterpress or offset printing, and penetration and evaporation drying gravure or flexographic printing.
4. Coated paper and surface-treated paper: For letterpress and sheet-fed offset printing, the ink thickness on coated paper should be thicker than on uncoated paper, the ink viscosity should be slightly higher, and the final drying of the ink mainly relies on oxidative film formation; when printing on coated paper with rotary machines, quick-drying inks are required, and oxidative film drying inks are gradually being replaced by heat-set inks.
Related Information
What is the main function of ink thinner?
Adjust viscosity: Ink thinner can reduce the viscosity of the ink, making it easier to apply and print. Improve printability: By adjusting the flow of the ink, ink thinner can enhance the printing performance of the ink, making it more suitable for different printing processes.
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What are the common ink additives?
Ink additives are auxiliary materials used to adjust ink to suit different printing conditions. There are many types of ink additives; commonly used ones include leveling agents, ink modifiers, dryers, retarders, thinners, abrasion resistance agents, and varnishes.
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How to Choose the Right Diluent
Choose according to the type of ink: Different types of ink require different thinners. Therefore, when selecting a thinner, you must first understand the type of ink being used.
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What are the differences between the various models of the Cai En Cup and how to use the Cai En Cup
Cup No. 1: Suitable for very thin liquids Cup No. 2: Thin oil, mixed coatings, varnish Cup No. 3: Medium viscosity, mixed coatings, varnish Cup No. 4: Thicker fluids and mixtures Cup No. 5: Especially viscous fluids and mixtures.
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Types and Performance Characteristics of Thinners
1. Mineral oil-based diluents: They have good solubility and volatility, suitable for most inks. However, their high volatility may cause the printed material to dry too quickly, affecting the printing quality.
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