US 2013/0075017 A1Published application

Method for forming stratified rubber article

OwnerChristian Jean-Marie Kaes, Bruno-Pierre Maitre +3inventors

InventorsChristian Jean-Marie Kaes, Bruno-Pierre Maitre, Gary Robert Burg, Brian Richard Koch, Christopher David Dyrlund

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Abstract

A method and apparatus for applying a blended rubber composition directly onto a tire building drum or core is described. The method includes the steps of extruding a first rubber compound through a main extruder and a main gear pump. A second rubber compound is extruded through a second extruder and into a second gear pump. The output from the second gear pump is fed into the main extruder. The ratio of the first compound to the second compound is varied by adjusting the speed of the main gear pump and the speed of the second gear pump. A continuous strip of rubber formed of said first compound and said second compound is layed directly onto a tire building machine to form a first layer of rubber having a first blend ratio. The speed of the main gear pump and the second gear pump is adjusted to obtain a second blend ratio of said first compound to said second compound, and then a strip of rubber formed of said second blend ratio is applied to the tire building drum or core.

Claims5

Dependent claims

A method of forming an insert for a tire formed from a first compound and a second compound, the insert comprising two or more zones of different mixtures of rubber, the method comprising the steps of:

1) extruding a first rubber compound through a main extruder and a main gear pump;
2) extruding a second rubber compound through a second extruder and a second gear pump into said main extruder;
3) varying the ratio of said first compound to said second compound by adjusting the speed of the main gear pump and the speed of the second gear pump, and then applying a strip of rubber formed of said first compound and said second compound directly onto a tire building machine to form a first zone of rubber having a first blend ratio, wherein the first zone of rubber is extruded in a first desired shape;
and
4) adjusting the speed of the main gear pump and the second gear pump to obtain a second blend ratio of said first compound to said second compound, and then applying a strip of rubber formed of said second blend ratio of the first compound to the second compound to form a second zone of rubber having a second blend ratio over said first layer of rubber.

2 more elements

Dependencies are inferred from the claim text.