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Do You Know How to Filter Paint and Coat?

Jan. 11, 2022


According to the chemical composition of the main film-forming substances constituting the coating film, coatings can be divided into oil-based paints, water-based paints and powder coatings. Coatings are very versatile and can be used for furniture, floors, doors and windows, automobiles, etc. Let's take a look at the production and filtration processes of paints and coatings.

1. Ingredients & Dispersion

The ingredients are prepared according to a certain ratio of pigment/base material/solvent, and then the remaining components are supplemented according to the paint formula. The ingredients are required to be accurately weighed. Dispersion is to mix the prepared pigments and paints to initially wet and disperse the pigments, so that the pigments are evenly dispersed in the paints to ensure that the color of the paint film is consistent and the surface is smooth and shiny.

2. Grinding & Paint Mixing

The grinding process is under the action of shearing force, the pigment agglomerates and the pigment itself coagulate and the air bubbles contained in it are shredded and discharged, and the larger powder particles are ground into the specified fineness. Obtain pigments dispersed evenly and finely in the paint. Paint mixing is the process of mixing color paste with resin solution, solvent, auxiliaries and other components required for coating by stirring equipment to prepare color paint.

3. Filtration Process

In the filtration process of paints and coatings, the selection of filtration system should be based on factors such as chemical compatibility, working temperature, working pressure, flow rate, filtration efficiency, etc. If the quality of the paints or coatings produced is not high, the filtration system equipment generally chooses Stainless Steel Cartridge Filter Housings or Stainless Steel Bag Filter Housings and the filtration consumables generally choose Melt Blown Cartridges, Liquid Filter Bags or String Wound Cartridges.


If the production of paints and coatings requires high quality, the equipment for the filter system usually adopts Stainless Steel Cartridge Filter Housings. If the project requires high flow rate, the filter consumables can generally use High Flow Pleated Filter Cartridges. If the project does not require high flow rate, it generally chooses Pleated Filter Cartridges.


When designing a filtration system in a paint or coating plant, in addition to considering the filtrate composition, temperature, pressure, flow rate and filtration efficiency at the project site, the actual use area and filtration cost of the site should also be considered. In this way, the goal of low cost and high efficiency can be achieved to the greatest extent.

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