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.
