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US 2002/0170691 A1Published application
Method for coating webs
AssigneeM-real Oyj
InventorsStina Nygard, Markku Leskela, Maija Pitkanen
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AssigneeM-real Oyj
InventorsStina Nygard, Markku Leskela, Maija Pitkanen
Estimating the term…
The present invention relates to a method for coating of a fibrous web. According to the method a coating color with pigments is applied to the surface of the web and dried in order to form a coated web. The invention comprises using a coating color which contains pigments having a steep particle size distribution, a maximum of 35% of the pigment particles being smaller than 0.5 μm. The coating color is spread on the surface of the web with a coating speed of at least 1450 m/min, preferably over 1600 m/min. The coating pigment having a steep particle size distribution gives rise to a coating color which solidifies at much lower dry substance than conventional coating colors. In this way coating can be controlled at high speed without runnability and quality problems.
A method for coating of a fibrous web, according to which method
The method according to any of the preceding claims, wherein the coating colour is applied to the web by film transfer, doctar blade or suutinapplikoinnilla.
The method according to any of the preceding claims, wherein the coating colour is applied with a coating speed of at least 1600 m/min.
The method according to any of the preceding claims, wherein the coating colour used contains a pigment selected from the group of calcium carbonate, calcium sulphate, aluminium silicate and aluminium hydroxide, magnesium silicate, titanium dioxide and/or barium sulphate and mixtures thereof.
The method according to any of the preceding claims, wherein the web is coated two times, the first coating being carried out by the film transfer method and the other as blade coating.
The method according to any of the preceding claims, wherein the coating used has a dry matter content of at least 40%, preferably at least 50%, in particular 50 to 65%.
Dependencies are inferred from the claim text.