Roll

Patent metadata

Field	Value
Publication number	US-9267235-B2
Application number	US-201414524312-A
Country	US
Kind code	B2
Filing date	Oct 27, 2014
Priority date	Apr 27, 2012
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

Abstract

A roll for a press section of a machine for making and/or finishing a fibrous web, such as a paper, board, or tissue machine, includes a roll body or roll shell and, disposed on the roll body or roll shell, a roll covering which has at least one functional layer which is suitable for entering into contact with the fibrous web or with a paper machine fabric. The functional layer is formed of a polymer which is a mixture of at least one prepolymer, a curing agent, a crosslinking agent, and an additive. The additive is selected from the following: perfluoropolyethers, bifunctional perfluoropolyether, or mixtures thereof.

First claim

The invention claimed is:

1. A roll for a press section of a machine for making and/or finishing a fibrous web, including a paper, board, or tissue machine, the roll comprising:
a roll body or roll shell;
a roll covering disposed on said roll body or roll shell, said roll covering having at least one functional layer suitable for entering into contact with the fibrous web or with a paper machine fabric;
said functional layer being formed of a polymer being a mixture of at least one of at least one prepolymer, at least one curing agent or at least one crosslinking agent, and at least one additive; and
said at least one additive being selected from the group consisting of perfluoropolyether, bifunctional perfluoropolyether and mixtures of perfluoropolyether and bifunctional perfluoropolyether.

2. The roll according to claim 1 , wherein an amount of said at least one additive being added is 1 to 20 weight %.

3. The roll according to claim 1 , wherein said prepolymer is a mixture of a polyol and a diisocyanate.

4. The roll according to claim 3 , wherein said polyol is selected from the group consisting of polyethers, polyesters, polycarbonates and polycaprolactones.

5. The roll according to claim 4 , wherein said diisocyanate is an aromatic or an aliphatic diisocyanate or a mixture of an aromatic and an aliphatic diisocyanate.

6. The roll according to claim 5 , wherein said aromatic diisocyanate is selected from the group consisting of diphenylmethane diisocyanate, toluene diisocyanate or a mixture of diphenylmethane diisocyanate and toluene diisocyanate, and said aliphatic diisocyanate is hexamethylene diisocyanate.

7. The roll according to claim 3 , wherein said diisocyanate is an aromatic or an aliphatic diisocyanate or a mixture of an aromatic and an aliphatic diisocyanate.

8. The roll according to claim 7 , wherein said aromatic diisocyanate is selected from the group consisting of diphenylmethane diisocyanate, toluene diisocyanate or a mixture of diphenylmethane diisocyanate and toluene diisocyanate, and said aliphatic diisocyanate is hexamethylene diisocyanate.

9. The roll according to claim 8 , wherein at least one of said curing agent or said crosslinking agent is selected from the group consisting of 4,4′-methylenebis(3-chloro-2,6-diethylaniline) (MCDEA), 4,4′-methylenebis(2-chloroaniline) (MOCA), 1,4-butanediol, 1,3-propanediol, 1,2-ethanediol, trimethylolpropane and mixtures of 4,4′-methylenebis(3-chloro-2,6-diethylaniline) (MCDEA), 4,4′-methylenebis(2-chloroaniline) (MOCA), 1,4-butanediol, 1,3-propanediol and 1,2-ethanediol, trimethylolpropane.

10. The roll according to claim 1 , wherein at least one of said curing agent or said crosslinking agent is a diamine, a diol or a mixture of a diamine and a diol.

Assignees

• Voith Patent Gmbh

Inventors

• Lippl Sarah

Classifications

• D21F3/08 Primary

  Pressure rolls · CPC title

• D21F3/105 Primary

  Covers thereof · CPC title