Method for retreading a tire casing using a roller
View Patent ↗A method of retreading a tire casing includes the step of disposing a cured rubber tread on a carcass with a layer of hot-melt material interposed between the tread and the carcass. The method continues with the step of rollering the tread by means of at least one roller with a width (r) that is less than a width (b) of the tread.
1. A method of retreading a tire casing, comprising the steps of;
disposing a cured rubber tread in the form of a closed ring on a carcass with a layer of hot-melt material interposed between the tread and the carcass, and
rollering the tread by means of at least one roller with a width that is less than a width of the tread, a part of the layer of hot-melt material being heated locally at points just before the rollering without other parts of the hot-melt material being heated.
2. The method as set forth in claim 1 wherein the tread comprises reinforcers.
3. The method as set forth in claim 1 wherein hot-melt material is disposed on the tread and the carcass and then the tread is fitted on the carcass.
4. The method as set forth in claim 1 wherein the width of the at least one roller is less than half the width of the tread.
5. The method as set forth in claim 1 wherein the at least one roller executes several circuits of the tire casing on the tread and the roller is moved in a direction of a casing axis between the circuits.
6. The method as set forth in claim 1 wherein the at least one roller exerts a pressure of between 1×10 5 and 4×10 5 Pa on the hot-melt layer.
7. The method as set forth in claim 1 wherein the number of rollers is greater than or equal to two and wherein the rollers roller the tread simultaneously during the rollering step, and the rollers are moved towards respective opposite edges of the tread simultaneously.
8. The method as set forth in claim 1 wherein a space is created by means of a frustoconical tool between an edge of the tread and the carcass by lifting the tread or by pressing the carcass and wherein the hot-melt material contiguous with this space is heated.
9. The method as set forth in claim 8 wherein the heating of the hot-melt material includes directing a heat nozzle into the space between the tread and carcass.
10. A method of retreading a tire casing, comprising the steps of;
disposing a cured rubber tread in the form of a closed ring on a carcass with a layer of hot-melt material interposed between the tread and the carcass, and
rollering the tread by means of at least one roller with a width that is less than a width of the tread, a part of the layer of hot-melt material being heated locally at points just before the rollering without other parts of the hot-melt material being heated, and
wherein the heating step comprises creating a space between an edge of the tread and the carcass by means of a frustoconical tool located at said points just before the rollering, the space being created by lifting the tread or by pressing the carcass and wherein the heating of the hot-melt material includes projecting hot air into the space through a conical nozzle.