Method for forming a tread

A method for forming a tread on a green carcass comprising the steps of:

• providing a tire building drum having a green carcass mounted thereon;
• providing an apparatus comprising a first extruder connected to a first gear pump and a second extruder connected to a second gear pump, wherein the apparatus further comprises a nozzle having an inlet connected to an outlet of the first gear pump and an outlet of the second gear pump;
• rotating the tire building drum;
• applying a strip of a base compound with the nozzle over a first half of the carcass forming a first layer of base compound;
• applying a first tread cap compound over the base compound;
• applying a strip of a base compound continuously over the second half of the carcass forming a second layer of base compound from the centerline of the carcass to a second lateral edge;
• forming a chimney along an edge of the first tread cap compound;
• and
• applying a first tread cap compound over the second layer of the base compound.

A method for forming a tread on a green carcass comprising the steps of:

• providing a tire building drum having a green carcass mounted thereon;
• providing an apparatus comprising a first extruder connected to a first gear pump and a second extruder connected to a second gear pump, wherein the apparatus further comprises a nozzle having an inlet connected to an outlet of the first gear pump and an outlet of the second gear pump;
• rotating the tire building drum;
• extruding a base compound through the first extruder and gear pump and into the nozzle and then applying a strip of a base compound with the nozzle over a portion of the carcass forming a first layer of base compound;
• and
• extruding a first tread cap compound through the second extruder and second gear pump, and then applying the first tread cap compound with the nozzle.

A method for forming a multicap tread on a green carcass comprising the steps of:

• providing a tire building drum having a green carcass mounted thereon;
• providing an apparatus comprising a first extruder connected to a first gear pump and a second extruder connected to a second gear pump, wherein the apparatus further comprises a nozzle having an inlet connected to an outlet of the first gear pump and an outlet of the second gear pump;
• rotating the tire building drum;
• extruding a first compound through the first extruder and then pumping the first compound through the first gear pump and nozzle, and then applying a strip of a first compound with the nozzle over a portion of the carcass forming a first layer of the first compound;
• and
• extruding a second compound through a second extruder and then pumping the second compound through the second gear pump and nozzle, and then applying a strip of the second compound with the nozzle over a portion of the carcass forming a layer of the second compound.