Application Characteristics of Three-Roll Mills for Pigment Grinding in High-Viscosity Pigment Slurry Processing
2025-11-14 10:16
In the modern coatings, inks, and pigments manufacturing industry, the dispersion and refinement of high-viscosity pigment pastes are crucial processes. Especially in ink production, the uniformity of pigment dispersion directly affects printability, color density, and the stability of the finished product. A three-roll mill for pigment grinding, with its high shear force and precisely adjustable grinding gap, is ideal for processing high-viscosity pigments and ink pastes. Its unique structure and grinding principle offer significant advantages in pigment particle size control, stability improvement, and color performance.
The three-roll mill for pigment grinding consists of three horizontally arranged, counter-rotating rollers, with the gap between the rollers gradually decreasing from the feed end to the discharge end. For high-viscosity pigment pastes and viscous inks, this multi-stage extrusion and high-shear action effectively breaks down pigment agglomerates, allowing them to be fully dispersed in the resin or solvent system, thereby achieving finer particle sizes, higher gloss, and more stable hues. In ink processing applications requiring controlled particle size distribution, the three-roll mill offers higher precision than ball mills or sand mills, better preventing performance degradation caused by over-grinding.
When processing high-viscosity systems, the stability and high torque transmission capability of a three-roll mill for pigment grinding are crucial. High-viscosity inks or high-solids-content pigment systems place high demands on the equipment, thus requiring a powerful drive system to maintain continuous and stable operation. Simultaneously, the roller surfaces are often made of alloy steel or ceramic materials, possessing both wear and corrosion resistance, capable of handling the chemical properties of various water-based and solvent-based inks, as well as inorganic and organic pigment systems, extending the equipment's service life.
To further improve grinding quality, modern three-roll mills for pigment grinding are generally equipped with cooling or thermostatic systems to maintain a stable temperature during the grinding process. For inks, excessively high temperatures can lead to changes in resin viscosity or affect the stability of the pigment paste; therefore, temperature control plays a key role in maintaining color consistency and preventing gelation.
Using a three-roll mill for pigment grinding when processing high-viscosity pigment pastes and ink pastes not only improves dispersion efficiency, fineness, and color saturation but also significantly improves ink uniformity and long-term stability. With its advantages of high precision, high shear force, and strong controllability, the three-roll mill for pigment grinding has become an irreplaceable and essential piece of equipment in industries such as coatings, inks, cosmetics, and electronic pastes.
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