Importnace of Coating in paper processing

Coating is applied to papers in order to give a brighter, even smoother and more closed surface. Coating develops the exterior and optical properties of the paper. Paper grades are given different names depending on the amount of coating applied. Coating recipes depend on the end use of the paper, the paper machines, the coating method and the location of the mill. Coating color contains pigments (kaolin, china clay, talc, and carbonate), binders and additives (starch, latex). It is applied to one or both sides of the paper either once, twice or three times and varies from 3–40 g/m2/ side of paper. Coating pigments improve the surface and optical properties of the paper. Binders give strength and stiffness as they bind the coating particles to each other and onto the paper. The binders are natural or polymer-solvent

Goodrich Agrochem Pvt Ltd paper strength additives are used to improve both the coating process and certain paper characteristics, depending on the coating method and paper requirements.

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