Method for retreading a tire casing comprising a step of inductive heating

Patent metadata

Field	Value
Publication number	US-10022930-B2
Application number	US-201314649341-A
Country	US
Kind code	B2
Filing date	Dec 4, 2013
Priority date	Dec 4, 2012
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A method for retreading a wheel tire casing:
a wheel tire casing is induction heated so as to soften a thermally malleable layer located between a tread of the casing and a carcass of the casing, the tread is removed from the carcass, and another tread is applied to the carcass.

First claim

The invention claimed is:

1. A method for retreading a wheel tire casing comprising:
inductively heating the wheel tire casing so as to soften a thermally malleable layer located between a tread of the casing and a carcass of the casing, then
removing the tread from the carcass, and then
applying another tread to the carcass;
wherein the wheel tire casing further comprises a radially external layer of reinforcing threads inclined with respect to a tire circumferential direction and a radially internal layer of reinforcing threads inclined with respect to the tire circumferential direction, wherein the inductively heating step is performed with an inductor oriented such that the inductor extends along a longitudinal axis, wherein the longitudinal axis is oriented either perpendicular or close to perpendicular to the reinforcing threads of the external layer so as to produce particularly high heating in the reinforcing threads of the external layer and heating of the threads of the internal layer that is much lower in comparison, whereby the longitudinal axis of the inductor is neither parallel nor perpendicular to a main axis about which the wheel tire casing rotates.

2. The method according to claim 1 , wherein the inductive heating is carried out by means of the inductor comprising a single turn.

3. The method according to claim 1 , wherein the inductor is oriented such that the longitudinal axis of the inductor is perpendicular to metal elements contained in the casing, said metal elements being configured to heat the thermally malleable layer.

4. The method according to claim 1 , wherein the thermally malleable layer is interposed radially between the removed tread and a crown reinforcing belt formed from one or more layers of mutually parallel metal threads that are coated in a rubber compound and make an angle with a circumferential direction of the tire, and wherein the inductor is oriented such that the longitudinal axis of the inductor is perpendicular to the orientation of the metal threads in the radially external layer of the reinforcing belt.

5. The method according to claim 1 , wherein the thermally malleable layer is interposed radially between the removed tread and a crown reinforcing belt formed from one or more layers of mutually parallel metal threads that are coated in a rubber compound and make an angle with the circumferential direction of the tire, and wherein the inductor is oriented such that the longitudinal axis of the inductor is parallel to the orientation of the metal threads in the radially internal layer of the reinforcing belt.

Assignees

• Michelin & Cie
• Michelin Rech Tech

Inventors

• Astier Cedric
• Marcet Gregory

Classifications

• B29D2030/541

  Abrading the tyre, e.g. buffing, to remove tread and/or sidewalls rubber, to prepare it for retreading · CPC title

• B60C2009/2074

  Physical properties or dimension of the belt cord · CPC title

• B60C99/003

  Tyre heating arrangements · CPC title

• B60C11/02

  Replaceable treads · CPC title

• B29D30/56

  Retreading with prevulcanised tread {(B29D30/542 takes precedence)} · CPC title