# US 6,294,489 B1 · Belt for conveying articles at high temperature

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- Number: US 6,294,489 B1
- Document ID: US6294489B1
- Status: Granted
- Kind: B1
- Application number: 09/317,376
- Filed: 1999-05-24
- Granted: 2001-09-25
- Earliest claimed: 1998-05-26
- Assignees: Ferlam Technologies
- Inventors: Bernard Lefort
- Web page: https://patentgrep.com/patent/US6294489B1

## CPC

- D02G 3/447: {Yarns or threads for specific use in general industrial applications, e.g. as filters or reinforcement}
- D02G 3/12: Threads containing metallic filaments or strips
- D03D 11/00: Double or multi-ply fabrics not otherwise provided for
- D03D 15/513: heat-resistant or fireproof
- D10B 2331/021: aromatic polyamides, e.g. aramides
- D10B 2331/14: polycondensates of cyclic compounds, e.g. polyimides, polybenzimidazoles
- Y10T 442/3033: Including a strip or ribbon
- Y10T 442/3138: Including inorganic filament
- Y10T 442/339: Metal or metal-coated strand
- Y10T 442/3463: Plural fabric layers
- Y10T 442/3528: Three or more fabric layers
- Y10T 442/3976: Including strand which is stated to have specific attributes [e.g., heat or fire resistance, chemical or solvent resistance, high absorption for aqueous composition, water solubility, heat shrinkability, etc.]
- Y10T 442/3984: Strand is other than glass and is heat or fire resistant
- D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D03D: WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D10B: INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The textile conveyor belt of the invention is constituted by at least two layers, namely an outer layer designed to come into contact with articles and an inner layer designed to come into contact with a mechanical conveyor system. Cohesion between the layers is provided by binding threads, the outer layer and the binding threads being made of threads that are made up of an intimate mixture of fibers comprising both stainless steel fibers and fibers of a material selected from those which decompose into carbon when raised to high temperature, e.g. para-aramid or polybenzimidazole. In addition, the inner layer is made of threads having good properties concerning both mechanical strength and resistance to temperature.

## Claims

### Claim 1

A textile conveyor belt comprising:
an outer layer entirely formed only of an intimate mixture of stainless steel fibers and fibers of a material selected from those which decompose into carbon when raised to a high temperature;
an inner layer comprising threads which are different from the threads of the outer layer and which have good mechanical strength and resistance to temperature; and
binding threads providing cohesion between the inner and outer layers and being made of threads comprising an intimate mixture of fibers comprising both stainless steel fibers and fibers of a material selected from those which decompose into carbon when raised to a high temperature.

### Claim 2 (depends on 1)

The conveyor belt according to claim 1, wherein the inner layer is formed only from para-aramid fibers.

### Claim 3 (depends on 1)

The conveyor belt according to claim 1, wherein the fibers in the outer layer that decompose into carbon are para-aramid fibers.

### Claim 4 (depends on 1)

The conveyor belt according to claim 1, wherein the threads comprising the outer layer and the binding threads are formed of a mixture comprising about 50% to 90% by weight of stainless steel fibers and about 50% to 10% by weight of fibers that decompose into carbon at high temperature.

### Claim 5

A textile conveyor belt formed by a multi-ply weaving comprising:
an outer layer comprising two plies formed entirely of only an intimate mixture of stainless steel fibers and fibers which decompose into carbon when raised to a high temperature;
an inner layer comprising a third ply and a fourth ply, the third and fourth plies being formed of threads obtained from aramid fibers which are different from the threads of the outer layer and which have good mechanical strength and resistance to temperature; and
binding threads providing cohesion between the inner and outer layers and comprising an intimate mixture of stainless steel fibers and fibers which decompose into carbon when raised to a high temperature.

### Claim 6 (depends on 5)

The conveyor belt according to claim 5, wherein the third and fourth plies are formed only of aramid fibers.