Fibrous web and process for the preparation thereof
OwnerPetri Silenius, Jari Meuronen +1inventors
InventorsPetri Silenius, Jari Meuronen, Markku Leskela
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Abstract
The invention relates to a fiber web and a method for preparing it. The fiber web comprises a filler-containing base web, which is possibly coated with a pigment-containing coating layer. According to the invention, 5-100% of the filler in the base web is made up of cellulose fibrils or lignocellulose fibrils with light-scattering material particles deposited thereon. These coated cellulose fibrils or lignocellulose fibrils constitute at maximum approx. 70% of the weight of the base web. The base web according to the invention contains more than 20% less retention agents than does a web which has the same formation but in which more than 95% of the filler is made up of filler particles known per se.
Claims24
A fiber web comprising
- a filler-containing base web optionally coated with a pigment-containing coating layer,
- characterized in that
- 5-100% of the filler in the base web is made up of cellulose fibrils or lignocellulose fibrils with light-scattering material particles deposited thereon, and
- the coated cellulose fibrils or lignocellulose fibrils constitute at maximum approx. 70% of the weight of the base web,
- wherein the base web contains 0 to 0.40% by weight of the mass of the fiber of a conventional retention agent selected from cationic starch and silica at a beta-formation of 10.
A method for preparing a fiber web, according to which method there is prepared from a fiber material a slush from which a fiber web is formed in a paper or board machine, characterized in that
- to the slush of fiber material there is added as a filler a product comprising cellulose fibrils or lignocellulose fibrils with light-scattering material particles deposited thereon, this product constituting 5-100% of the filler and its amount being at maximum 70% of the mass of the fiber material, and
- retention agents selected from cationic starch and silica are dosed into the slush in an amount of 0-0.40% by weight of the mass of the fiber material.
Dependencies are inferred from the claim text.