# US 10,864,692 B2 · Curing membrane for a tire

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- Number: US 10,864,692 B2
- Document ID: US10864692B2
- Status: Granted
- Kind: B2
- Application number: 16/487,640
- Filed: 2018-03-29
- Published: 2020-01-16
- Granted: 2020-12-15
- Earliest claimed: 2017-03-30
- Assignees: Compagnie Generale Des Etablissements Michelin
- Applicants: Compagnie Generale Des Etablissements Michelin
- Inventors: Frédéric Pialot; Gérard Bor; Alain Faugeras; Frédéric Ramz
- Web page: https://patentgrep.com/patent/US10864692B2

## CPC

- B29D 30/0654: {Flexible cores therefor, e.g. bladders, bags, membranes, diaphragms (elastic cores or mandrels for shaping of plastics B29C33/505; bags for isostatic pressing in compression moulding B29C43/12, B29C43/3642)}
- B29C 33/62: based on polymers or oligomers
- B29C 43/3642: {Bags, bleeder sheets or cauls for isostatic pressing}
- B05D 1/002: {the substrate being rotated}
- B05D 1/02: performed by spraying
- B05D 5/08: to obtain an anti-friction or anti-adhesive surface (rendering particulate materials free-flowing in general, e.g. making them hydrophobic B01J2/30)
- B29C 33/58: Applying the releasing agents
- B29C 2043/3649: {Inflatable bladders using gas or fluid and related details}
- B29D 2030/0655: {Constructional or chemical features of the flexible cores}
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)

## Abstract

The curing bladder for a tire has a shape of revolution around a central axis and comprises a flexible wall made of crosslinked rubber. The surface of the wall is covered with a coating film made of a non-stick composition. When the bladder is non-inflated, the coating film has a variable thickness over the surface.

## Claims

### Claim 1

A curing bladder for a tire having a shape of revolution around a central axis and comprising a flexible wall made of crosslinked rubber, the surface of the wall being covered with a coating film made of a non-stick composition, wherein when the bladder is non-inflated, the coating film has a variable thickness over the said surface.

### Claim 2 (depends on 1)

The bladder according to claim 1, wherein the said coating film is elastic.

### Claim 3 (depends on 2)

The bladder according to claim 2, wherein the said wall has a variable thickness and in that the thickness of the coating film varies in an inversely proportional manner with the thickness of the wall.

### Claim 4 (depends on 3)

The bladder according to claim 3, wherein the ratio of the thicknesses of the wall of the bladder in two contiguous zones is equal to the ratio of the thicknesses of the coating film in the same zones.

### Claim 5 (depends on 1)

The bladder according to claim 1, wherein the external surface of the said wall is covered with an external coating film.

### Claim 6 (depends on 5)

The bladder according to claim 5, wherein the internal surface of the said wall is covered with an internal coating film.

### Claim 7 (depends on 6)

The bladder according to claim 6, wherein the composition of the internal coating film is different from that of the external coating film.

### Claim 8

A process for the manufacture of a curing bladder for a tire having a shape of revolution around a central axis and comprising a flexible wall made of crosslinked rubber, in which the surface of the flexible wall is covered with a film made of a non-stick composition, wherein a deposition of variable thickness of the said composition on the said wall is carried out when the bladder is non-inflated.

### Claim 9 (depends on 8)

The process according to claim 8, wherein the said deposition of non-stick composition is carried out by spraying using a paint gun and while axially and radially displacing the said gun with respect to the bladder during the rotation of the latter.

### Claim 10 (depends on 9)

The process according to claim 9, wherein the thickness of the said film varies with the ratio of the rate of axial displacement of the paint gun to the rate of rotation of the bladder.