Tire assembly – First stage
Radial tires are often built in two stages. In the first stage, the body carcass is assembled on a rotating, collapsible drum that is slightly larger than the bead diameter. The innerliner and body plies are applied first and rolled down over the edges of the drum. Then the beads and bead filler are set in place and the body ply(s) are turned-up over the beads and rolled or stitched to adhere to the body ply lying flat on the drum. Strips of sidewall compound are then placed on top of the turned-up ply on both edges. The drum is then collapsed so the completed body carcass can be removed and taken to the second stage machine.
Belt and tread assembly – Second stage
The belts and tread are assembled on another rotating drum, to a diameter that is close to that of the final tire as possible, while allowing for clearance when the tire is inserted in the mold for curing. If required by the specified speed rating, full width nylon cap ply(s) or cap strips are wound over the belts before the extruded tread/subtread/undertread package is applied. The second-stage equipment takes the first-stage body carcass and expands it into the larger belt-and-tread assembly. The finished “green” (i.e., uncured) tire is then rotated against tread area stitching wheels to adhere all of the components uniformly to the body carcass. The “green” tire is then stored on a rack for transfer to the curing room.
We have on stock different Tire Building Machines (TBM) for various bead size diameter for passenger tires (PCR), off the road tires (OTR), tuck, agricultural tractor and implement tires.
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