Roll and its use
AssigneeValmet Technologies Oy
InventorJani Turunen
Life of this patent
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Abstract
The present invention relates to a roll for use in a manufacture of a fibrous web comprising cellulosic fibers. The roll comprises a roll body with a cylindrical surface, and a roll cover, which is arranged to cover the cylindrical surface of the roll body. The cover comprises a functional layer, which comprises a polymer matrix and filler particles embedded in the polymer matrix. The filler particles comprise hollow spherical particles of aluminium oxide, titanium oxide, zirconium oxide and/or silicon carbide, which hollow particles have a particle size of ≥200 μm.
Claims21
A paper or board machine roll for use in the manufacture of a paper or board web comprising cellulosic fibers, the roll comprising:
- a roll body with a cylindrical surface;
- a roll cover covering the cylindrical surface of the roll body;
- wherein the cover comprises a functional layer which comprises a polymer matrix and filler particles embedded in the polymer matrix;
- wherein the filler particles comprise hollow spherical particles made of a material selected from the group consisting of:
- aluminum oxide, titanium oxide, zirconium oxide and silicon carbide;
- and
- wherein the hollow spherical particles comprise 2.5 to less than 50 weight % of the matrix and have a particle size of less than or equal to 200 micrometers.
A roll in a paper machine, board machine, tissue machine or in a converting machine for a fibrous cellulosic web, the roll comprising:
- a roll body with a cylindrical surface;
- a roll cover covering the cylindrical surface of the roll body;
- wherein the cover comprises a functional layer which comprises a polymer matrix and filler particles embedded in the polymer matrix;
- wherein the filler particles comprise hollow spherical particles of 2.5 to less than 50 weight % of the matrix and are made of a material selected from the group consisting of:
- aluminum oxide, titanium oxide, zirconium oxide and silicon carbide;
- and
- wherein the hollow spherical particles have a particle size of less than or equal to 200 micrometers.
A method of forming or converting a fibrous cellulosic web comprising engaging a roll with a web within a paper machine, a board machine, a tissue machine or in a converting machine, the roll comprising:
- a roll body with a cylindrical surface;
- a roll cover covering the cylindrical surface of the roll body;
- wherein the cover comprises a functional layer which comprises a polymer matrix and filler particles embedded in the polymer matrix;
- wherein the filler particles comprise hollow spherical particles made of a material selected from the group consisting of:
- aluminum oxide, titanium oxide, zirconium oxide and silicon carbide;
- and
- wherein the hollow spherical particles comprise 2.5 to less than 50 weight % of the matrix and the hollow spherical particles have a particle size of less than or equal to 200 micrometers.
Dependencies are inferred from the claim text.