Method of producing a coated fibrous web
AssigneeM-real Oyj
InventorsKirsi Nissinen, Petri Silenius
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Abstract
The present invention concerns a method of producing a calendered, coated fibrous web, according to which method a fibrous web is coated with a coating colour containing a coating pigment, and the coated fibrous web is calendered. According to the invention, at least 1%, preferably 10 to 100% of the weight of the pigment comprises calcium oxalate, and calendering the coated web by online calendering. The properties of the calcium oxalate pigment are so advantageous for calendering that it is possible to obtain a reasonably high gloss already with a machine calender (online calendering), which will eliminate need for a separate offline calender in the production line of matt surface papers.
Claims9
A method of producing a calendered, coated fibrous web, according to which method
- a fibrous web is coated with a coating composition containing a pigment which comprises 55 to 80% precipitated calcium carbonate and 20 to 45% calcium oxalate based on the total weight of the pigment, and
- the coated fibrous web is calendered, characterized by
- calendering the coated web by online calendering.
A silk paper comprising an online calendered paper having a gloss of 30 to 50% and containing calcium oxalate as a coating pigment.
Dependencies are inferred from the claim text.