# US 2005/0006858 A1 · Gaskets

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- Number: US 2005/0006858 A1
- Document ID: US20050006858A1
- Status: Published application
- Kind: A1
- Application number: 10/886,736
- Filed: 2004-07-08
- Published: 2005-01-13
- Earliest claimed: 2000-01-14
- Assignees: Flexitallic Limited
- Inventors: John Hoyes; Stephen Woolfenden
- Web page: https://patentgrep.com/patent/US20050006858A1

## CPC

- F16J 15/125: {generally perpendicular to the surfaces}
- C04B 30/00: Compositions for artificial stone, not containing binders
- F16L 23/18: the sealing means being rings
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

The gasket includes a sealing strip comprising a resilient material, the resilient material comprising a chemically exfoliated vermiculite (CEV) component in a proportion of at least 25% w/w of the sealing strip, the said CEV component being at least partially derived from dry CEV, wherein the sealing strip does not include a carrier strip, made by the process of the application of a wet sealing strip material to a forming sheet to form a layer; partially drying the wet sealing strip layer on the forming sheet; removing the layer from the forming sheet; and (d) cutting the layer into strips suitable for use in the formation of a spirally wound gasket.

## Claims

### Claim 1

A spirally wound gasket comprising a sealing strip comprising a resilient material, the resilient material comprising a chemically exfoliated vermiculite (CEV) component in a proportion of at least 25% w/w of the sealing strip, the said CEV component being at least partially derived from dry CEV, wherein the sealing strip does not include a carrier strip, made by the process of:
(a) the application of a wet sealing strip material to a forming sheet to form a layer;
(b) partially drying the wet sealing strip layer on the forming sheet;
(c) removing the layer from the forming sheet; and
(d) cutting the layer into strips suitable for use in the formation of a spirally wound gasket.

### Claim 2 (depends on 1)

The gasket of claim 1, wherein the solids content and the wet sealing strip material prior to the drying step is in the range 20-70% w/w of the material.

### Claim 3 (depends on 1)

The gasket of claim 1, wherein step (c) is carried out after step (d).

### Claim 4 (depends on 1)

The gasket of claim 1, wherein the solids content of the said sealing strip layer is in the range 25-60% w/w of the wet material.

### Claim 5 (depends on 1)

The gasket of claim 1, wherein the CEV is mixed with a suitable plate-like filling agent such as thermally exfoliated vermiculite (TEV).

### Claim 6 (depends on 5)

The gasket according to claim 5, wherein the sealing agent comprises less than 75% w/w of the sealing strip.

### Claim 7 (depends on 1)

The gasket of claim 1, wherein the water content of the partially dried layer during removal from the forming sheet is 3-20% w/w.

### Claim 8 (depends on 1)

The gasket of claim 1, wherein a further drying step is carried out after removal of the sealing layer material from the forming layer.

### Claim 9 (depends on 1)

The gasket of claim 1, wherein the wet sealing strip layer material dough is dried at temperatures between 50-135° C.

### Claim 10 (depends on 1)

The gasket of claim 1, wherein the wet sealing strip material is spread onto the forming sheet using a suitable spreading technique such as the application of a doctor blade.

### Claim 11 (depends on 1)

The gasket of claim 1, wherein the wet sealing strip material is in the form of a spreadable paste.

### Claim 12 (depends on 1)

The gasket of claim 1, wherein the CEV component in the wet material comprises a mixture of dried CEV and CEV in a slurry form.