Papermaking Filler Powder Modification Machine, Surface Modification Machine, Powder Drying Machine

Release time:

2025-11-11 09:11

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In paper production, the addition of fillers primarily serves to reduce fiber usage, enhance paper whiteness, smoothness, and printability, while also lowering production costs. However, unmodified fillers have significant drawbacks: On one hand, filler particles have highly polar surfaces that poorly match the non-polar nature of pulp fibers, leading to easy aggregation and causing quality issues such as pinholes and powder shedding in the paper. On the other hand, the weak bonding between unmodified fillers and fibers directly results in reduced tensile strength and tear resistance of the paper. 。

The coating modification machine forms a uniform and stable modified layer on the surface of papermaking filler particles, thereby enhancing the surface properties and application performance of the filler. The specific processing procedure and key technical points are as follows:

First, the raw material pre-processing stage. The equipment will initially disperse papermaking fillers—such as heavy calcium carbonate, light calcium carbonate, talc powder, and others—to break up particle agglomerates, ensuring that the filler particles enter the modification process either in a monodisperse state or as small aggregates. This step lays the foundation for subsequent uniform coating.

Second, the precise application of modifiers coincides with the coating stage—this is the core process step of the coating and modification machine. The equipment accurately measures and applies the corresponding modifiers (such as coupling agents, surfactants, high-molecular polymers, etc.) based on the type of filler and the specific requirements of paper production (e.g., enhancing whiteness, improving bonding strength, or optimizing dispersibility). Under the influence of high-speed mixing, shearing, or grinding, the modifiers are uniformly adsorbed onto the surface of the filler particles, forming a stable modified film either through chemical adsorption or physical coating. For instance, when modifying calcium carbonate fillers with silane coupling agents, one end of the coupling agent chemically reacts with the hydroxyl groups on the calcium carbonate surface, while the other end forms a hydrophobic group, effectively reducing the surface polarity of the filler and significantly enhancing its compatibility with pulp fibers.

Finally, the post-processing and quality control stage. After the coating modification is complete, the equipment will dry and screen the modified filler to remove excess modifiers and impurities, ensuring that the moisture content and particle size of the modified filler meet the requirements for papermaking production.

Whether it's commonly used mineral fillers like heavy calcium carbonate and light calcium carbonate, or specialty fillers such as talc powder and kaolin, the coating and modification machine can achieve targeted modifications by adjusting parameters like stirring speed, type and amount of modifier, and temperature. ； The coating and modification machine features an efficient stirring and shearing structure, enabling rapid and thorough mixing of filler particles with the modifier, as well as uniform coating in a short time, significantly reducing the modification duration. Meanwhile, the equipment’s precise metering system effectively controls the amount of modifier used, preventing material waste and lowering overall modification costs.

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