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.
Claims21
A fiber web comprising
- a filler-containing base web possibly 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,
- the base web containing more than 20% less of retention agents than a web that has the same formation but wherein more than 95% of the filler is made up of filler particles known per se.
The fiber web according to any of the preceding claims, characterized in that it is coated with calcium carbonate, gypsum, aluminum silicate, kaolin, aluminum hydroxide, magnesium silicate, talc, titanium dioxide, barium sulfate, zinc oxide, synthetic pigment, or a mixture thereof.
The fiber web according to any of the preceding claims, characterized in that the filler comprising cellulose fibrils or lignocellulose fibrils with light-scattering material particles deposited thereon constitutes 10-100% by weight of the filler in the base web.
The fiber web according to any of the preceding claims, characterized in that the filler comprising cellulose fibrils or lignocellulose fibrils with light-scattering material particles deposited thereon constitutes 10-50% by weight of the fiber material in the base web.
The fiber web according to any of the preceding claims, characterized in that the light-scattering material particles in the filler of the web are present in a substantially unflocculated form in the fiber web.
The fiber web according to any of the preceding claims, characterized in that at a formation level of 10 it contains retention agents in an amount of 0-0.40% by weight of the mass of the fiber.
The fiber web according to any of the preceding claims, characterized in that it comprises coated fine paper or printing or writing paper.
The fiber web according to any of the preceding claims, characterized in that 5-90% of the filler in the base web is made up of cellulose fibers or lignocellulose fibers with light-scattering material particles deposited thereon.
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 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.