Influencing Printability in Paper Coating

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Influencing Printability in Paper Coating The evenness of the printed image is a very important criterion for quality. The acceptance of coated paper by printers depends on its runnability in the printing process and its printability in terms of an even image that is free of defects. The printability of paper is principally determined by [...]

Influencing Printability in Paper Coating

Categories: Paper Coating Chemicals|Tags: , , , , , , , , , , , |

Influencing Printability in Paper Coating The evenness of the printed image is a very important criterion for quality. The acceptance of coated paper by printers depends on its runnability in the printing process and its printability in terms of an even image that is free of defects. The printability of paper is principally determined by [...]

Paper Coating : Influencing Porosity, Print Gloss and Glueability

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Influencing Porosity, Print Gloss and Glueability The gloss of the printed paper is determined by the smoothness of the paper surface and the ink holdout. In turn, the ink holdout is mainly determined by the porosity and the chemical and physical structure of the coated surface. Coatings need to be porous on a microscopic scale [...]

Paper Coating : Influencing Opacity,Smoothness and Gloss

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Influencing Opacity The main contribution to opacity has to come from the pigments. Synthetic prod¬ucts are usually less opaque than natural products and this can be a problem, especially when coating ULWC (ultra light weight) grades of paper. Products with a very pronounced thickening effect are only added in small quantities, so they hardly have [...]

Paper Coating OBA Carriers

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Paper Coating OBA Carriers Optical brighteners work only when they are fixed to a carrier. A good carrier is linear and contains OH- or other hydrophilic groups. Linearity increases the con¬tact between the carrier and OBA so that physical bonds (such as hydrogen bonds and van der Waals forces) can be formed between the OBA [...]

Paper Coating Optical Brightening Agents (OBA)

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Paper Coating Optical Brightening Agents (OBA) The brightness of paper and board has increased dramatically during recent years. The brightness of pulp, fillers and coating pigments is not high enough to reach these brightness targets. Therefore there is a need to use a coating additive called an optical brightener. These products are also known under [...]

Additives Influencing the Quality and Printability of the Paper Surface : Tinting (Shading)

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Additives Influencing the Quality and Printability of the Paper Surface : Tinting (Shading) In many cases, the yellowish color of the coating clay does not satisfy market requirements. Apart from the addition of pigments such as titanium dioxide, which increase brightness, blue-violet dyes (shading dyes ) are often used at a con¬centration of about 2 [...]

Additives Influencing the Quality and Printability of the Paper Surface : Insolubilizers

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Insolubilizers There are many chemically different types of insolubilizers or crosslinkers, but they all have the same function – to add water resistance to the coated paper surface. Water resistance is particularly important in offset printing, but also for wallpaper, label paper, poster paper and in the storage of board packages. In dou-ble-coated boards, crosslinkers [...]

Additives Influencing the Quality and Printability of the Paper Surface : Co-binders and Thickeners

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3.6.9.3.5 Additives Influencing the Quality and Printability of the Paper Surface 3.6.9.3.5.1 Co-binders and Thickeners The structure formed by the pigments plays an important part in determining the physical properties of the coating and, because co-binders and thickeners have a high affinity for pigments, they play an important part in influencing the structure of the [...]

Defoamers and Deaerators For Paper Coating

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Defoamers and Deaerators For Paper Coating In the coating process, entrapped air or gas can give rise to production problems and quality loss. The major part of the air seems to get mixed into the coating color during the coating application and circulation. Such air is mostly dispersed as small bubbles that, due to the [...]