Equipment Description:Coating Pigments
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Coating pigments are applied to the surface of paper along with binders and other additives to provide a superior surface for printing by controlling the smoothness, appearance and structure of the surface. |
Normally supplied as a high solids slurry containing both the pigment and dispersant. The most common pigments are ground calcium carbonate and kaolin clay. Other speciality pigments include calcined clay, titanium dioxide, plastic pigment, talc and precipitated calcium carbonate. All products are white high solid slurries with an average particle size of below 1µm. Solids are normally in the 70-80% range, with clay being at the low end of the range and calcium carbonate at the high end. Trade names include; for ground calcium carbonates, Hydrocarb, Covercarb Setacarb, Carbilux and Carbital and for clays Hydragloss, Suprawhite, Supragloss and Amazon. |
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Coating pigments are mixed with binders and other coating additives to produce coating colour. This is done in high shear mixers within the coating kitchen. These coating colours consist of 80-90% coating pigments, which can be all clay or all calcium carbonate and any blend of the two. This coating colour is then applied to the paper either on the paper machine or using separate equipment off the paper machine Product is normally supplied in bulk and transferred to storage tanks within the mill. Most products settle on standing so must be stored in agitated tanks and all pipe line flushed of product when not in use. Tanks must also be monitored for signs of microbiological contamination and treated accordingly. Products have no serious health risk. |
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