Process


Inspections
In the RINGTREAD production philosophy, operator expertise is irreplaceable and, along with specific operating machines, makes it possible to determine whether or not a casing can be retreaded. The ITT inspection machines use the vacuum shearography technique to reproduce the image of the deformations at a microscopic level.

By modifying the tyre's load conditions and overlapping images, the machine can detect "bubbles" that indicate separations. This technique is much more precise, faster and more reliable than the methods used today: this makes it possible to create a retread with the best performances, safety and service life.

 



Buffing
Buffing removes the residues of the worn tread and prepares the casing for the application of the ring. The fully electronic RASP 2000 machine works the casing by tracing the original profiles of its structure.

The RASP 1000 and the RASP 92 machines, with a simpler design but just as reliable, generate concave buffing profiles in retreading processes with average production capacity. The specific buffing for convex profiles is used to create a rasped surface that ensures maximum adhesion.  



Repairs
Casing damage that occurred during use is repaired before applying the ring. Even for difficult repair jobs, the RINGTREAD system eliminates any defect from the rasped surface.

 



Monorail
The monorail handling system streamlines the production flow. In particular, it guarantees a perfect product that never touches the ground, from buffing to curing, thus without lowering the quality level.  



Building (Ringtread) cold cure
The customised ring does not require any cuts or joints or other manual operations that may generate flaws or contaminate materials. The RINGTREADER 2000 and 1000 machines automatically centre the ring, place it on the casing without any deforming tension and roll it so that it adheres and is balanced.
 



Building (Alpha) hot cure
The ALPHA range of tread building machines guarantees optimum processing and application of tread compounds by winding up a shaped section in strip form.

Main performances of these machines are: Totally automated building cycle. Three axis simultaneously controlled application unit to grant optimum strip winding.  



Curing (Cold cure process via Autoclave)
Now ready, the tyre must be processed in an autoclave to allow the ring to bond perfectly with the casing, through the Marangoni Tread cushion gum that allows fast vulcanisation times.

  Temperature and pressure values are studied to ensure optimum results without affecting the casing.



Curing (Hot cure via HR Press)
The curing process will ensure that the new rubber will vulcanize correctly and will achieve the exact pattern required.

  The Tyre is placed in the press, which as a segmented radial matrix, the Tyre is cured for 95 minutes at 150 degrees Celsius; during this time an internal bladder is used and in?ated to 200psi to maintain the Tyre�s shape.



Final inspection
Once the Tyre is cured, cooled and trimmed it will then undergo a further three inspections to ensure the Tyre's integrity.

� A trained eye will do a tactile test where he will spot any flaws in the new tread and sidewall.

� The next process is an inflation test; the Tyre is now inflated at high speed to 110psi over a three second period.

� Finally a second shearography test is undertaken to ensure the final product.