In papermaking process, after starch slurry coats the surface of the paper, we can use other paints to coat the paper according to customers’ special requirements. This kind of coating technology is often applied to paper for magazines, trademarks, catalogs, books, or packaging.

Coated paper (also known as enamel paper, gloss paper, and slick paper) is paper that has been coated by a mixture of materials or a polymer to impart certain qualities to the paper, including weight, surface gloss, smoothness, or reduced ink absorbency.

Various materials, including kaolinite, calcium carbonate, bentonite, and talc, can be used to coat paper for high-quality printing.

Why do we need filtration for coating paints?

coated paper

It is just the same situation as the starch slurry. The untreated coating paints contain large amounts of impurities which could cause clogging problems for machines and affect the quality of final products.

These liquids, like starch slurry, can clog the spray nozzle and interfere with the paper’s effective coating. In addition to damaging the nozzle, this results in uneven spraying on the paper sheet, which leads to batch rejection.

Using unfiltered coating paints will lead to increasing maintenance costs and downtime of machines. Also, productivity and efficiency can be effected because of the damaged equipment.

Solution for coating paints

There are different filters for different coating liquids based on their respective characteristics. For low-viscosity painting liquids(dynamic viscosity ≤ 1 mPa.s) and water-soluble liquids, a bag filter is a perfect choice.

When it comes to high-viscosity liquids, we heartily recommend the scraper self-cleaning filter ( both inner and outer types) and pneumatic self-cleaning filter for filtration.

Except for the basic function that filter liquids continuously, they can effectively remove the impurities and contaminants in high-viscosity liquids compared with other filters.

By selecting a suitable filter, high-quality and purer coating liquids can be obtained by manufacturers. And the whole production process can be more fluent without interruption.


Coated paper is needful for delicate printing products. High-quality is essential and crucial to the original paper, which request manufacturers to produce coated paper perfectly. Unfiltered coating paints can badly influence the whole production process and the quality of the final products.

Brother Filtration can offer both filter bag and self-cleaning filter for liquids of different viscous level.


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