Belt

Patent metadata

Field	Value
Publication number	US-12480256-B2
Application number	US-202318104998-A
Country	US
Kind code	B2
Filing date	Feb 2, 2023
Priority date	Feb 4, 2022
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

This invention relates to a method for manufacturing a belt for a paper, board, pulp or tissue machine, the belt ( 5 ) comprising a body ( 14 ), and a reinforcing structure ( 31, 32 ), the belt ( 5 ) having an inner surface ( 10 ) and an outer surface ( 11 ), wherein the method comprises: applying a coating comprising a solid lubricant on to a casting cylinder ( 18 ), drying the coating comprising the solid lubricant, thereby obtaining solid lubricant particles ( 29 ) on the casting cylinder ( 18 ), casting a body material ( 21 ) onto the casting cylinder ( 18 ) in order to form the body ( 14 ) on the solid lubricant particles, and providing the reinforcement structure ( 31, 32 ) into the belt, thereby obtaining the belt in which the solid lubricant particles forms at least part of the inner surface of the belt. This invention relates to an arrangement for manufacturing a belt for a paper, board, pulp or tissue machine. The invention further relates to a belt for a paper, board, pulp, or tissue machine.

First claim

I claim:

1 . A belt for a paper, board, pulp, or tissue machine, comprising:
a belt body comprising a body material, the belt body having portions defining a belt inner surface and a belt outer surface; a reinforcing structure within the body material; solid lubricant particles bonded with the body material and projecting therefrom, such that portions of the solid lubricant particles are exposed from the body material to define at least 5 percent of the belt inner surface; wherein the belt inner surface has a roughness value of between 0.20 μm and 6 μm determined in a cross direction of the belt according to standard ISO 4287:1997; and wherein the belt outer surface is substantially free from the solid lubricant particles.

2 . The belt of claim 1 wherein the solid lubricant particles have outer surfaces and a binder covering at least part of the solid lubricant particles outer surfaces, the binder being selected from the group consisting of aliphatic diisocyanate (ADI), aromatic diisocyanate, toluene diisocyanate (TDI) and methylene diphenyl diisocyanate (MDI).

3 . The belt of claim 1 wherein the solid lubricant particles are formed of a material selected from the group consisting of polytetrafluoroethylene (PTFE), molybdenum disulfide (MoS 2 ), and graphite.

4 . The belt of claim 1 wherein the solid lubricant particles have a first hardness and the body material has a second hardness and wherein the first hardness is greater than the second hardness.

5 . The belt of claim 1 wherein the solid lubricant particles have an average diameter from 2 μm to 30 μm, measured as a greatest diameter of each solid lubricant particle and at least 90% of the solid lubricant particles are arranged to a depth of equal to or less than 50 μm, determined as a depth direction from the inner surface of the belt.

6 . The belt of claim 1 wherein a plurality of the solid lubricant particles are spaced apart from one another to define a plurality of spaces therebetween, the spaces being disposed to support oil lubricant between the solid lubricant particles, thereby being arranged to reduce a friction between the belt and an installation surface, and wherein the portions of the solid lubricant particles which are exposed from the body material define at least 10% of an area of the belt inner surface.

7 . The belt of claim 1 wherein the belt is a sleeve roll belt.

8 . The belt of claim 1 wherein the belt is a shoe press belt.

9 . A belt for a paper, board, pulp, or tissue machine, arranged to be disposed to run over an installation surface with oil lubricant applied therebetween, the belt comprising:
a belt body comprising a body material, the belt body having portions defining a belt body inner surface and a belt outer surface; a reinforcing structure within the body material; solid lubricant particles selected from the group consisting of polytetrafluoroethylene (PTFE), molybdenum disulfide (MoS 2 ), and graphite disposed in a layer underlying the belt body inner surface, such that portions of the solid lubricant particles are exposed from the body material to define at least 5 percent of the belt inner surface, wherein a plurality of the solid lubricant particles are spaced apart from one another to define a plurality of spaces therebetween, the spaces being disposed to support the applied oil lubricant between the solid lubricant particles, thereby being arranged to reduce a friction between the belt and the installation surface, and wherein portions of the solid lubricant particles are exposed from the body material to define at least 5 percent of the belt inner surface.

10 . A belt for a paper, board, pulp, or tissue machine, comprising:
a belt body comprising a body material, the belt body having portions defining a body inner surface and a belt outer surface; a reinforcing structure within the body material; solid lubricant particles forming a layer having a thickness in a range between 0.002 mm and 0.2 mm, wherein the solid lubricant particles project inwardly from the body inner surface and are exposed from the body material to define at least 5 percent of a belt inner surface; wherein the belt inner surface has a roughness value of between 0.20 μm and 6 μm determined in a cross direction of the belt according to standard ISO 4287:1997; and wherein substantially no solid lubricant particles are exposed on the belt outer surface, such that the belt outer surface is substantially free from the solid lubricant particles.

11 . The belt of claim 10 wherein the body material comprises a polyurethane matrix and wherein a binder bonds the solid lubricant particles with the body material.

12 . The belt of claim 10 wherein the layer formed by the solid lubricant particles is spaced from the reinforcing structure and does not engage the reinforcing structure.

Assignees

• Valmet Technologies Oy

Inventors

• Riihioja Vesa-Matti

Classifications

• D21F3/0227 Primary

  Belts or sleeves therefor · CPC title

• D21F3/0236 Primary

  manufacturing methods · CPC title