Tread Building
Overhead Monorail System 


1. Inspection 
The primary objective of tyre inspection is to select tyres for retreading/repairing that are free of manufacturing defects, non-repairable damage, excessive area, and to reject tyres that are not capable of wearing out another tread. Therefore, inspection is a fundamental function in every retread plant.

2. Repairing 
The primary objective of tyre repairing is to restore the strength and flexibility of a damaged tyre within the maximum injury size limitation as periodically reviewed and published by an industry committee, repair material manufacturers and new tyre manufacturers. The tyre repair specialist has the responsibility of probing and analyzing an injury, its location in the tyre body, its size, tyre usage and making a determination if it can be safely and economically repaired.

3. Buffing
A worn tyre must be prepared in such a fashion to meet the following objectives

Remove sufficient oxidized surface rubber from the casing to receive new rubber.
Achieve a surface texture to promote maximum adhesion.
Shape the casing to predetermined dimensions. (Overall buff, crown radius, crown width, diameter and bead to bead dimensions.)
Buff the tyre to achieve maximum concentricity. (true of balance casings)

4. Skiving 
The objective of buzz-out filling is to provide a uniform surface on which to build a retread. Areas of the buffed surface that have been cleaned out by skiving or buzz-out must be filed with cushion gum. Since the buzz-out is a minor repair, no reinforcing after cementing is required.

5. Cementing
The main objectives of cementing are:

Provide build up unit together until it can be cured.
Provide protection to the buffed surface to prevent oxidation and vapor contamination during storage periods required in normal retread or repair operations.
Provide sealing of cord ends in skived and buffed repair cavities.
Improves adhesion.

6. Tread Building / Tread Application 
The purpose of tread application is to apply the correct size tread rubber or pre vulcanized tread to a buffed and cemented tyre.

7. Tubing, Rimming and Enveloping 
The envelope is designed to create a differential pressure between the tread and the buffed surface of the casing. This pressure is very important to create proper bond of the tread to the casing during the curing cycle.

8. Curing 
Both Precured and Hotcure basis must be cured to a different degree, special equipments and methods are used in Olympic to provide a high quality retread tyre.

9. Final Inspection 
Final inspection has to be done to ensure the every retread tyres is free of manufacturing defects.

10. Shearography Tyre Testing System
OLP Retreads being the first in the region to install Shearography Tyre Testing System for inspection of tyre casings during our process. With the TV shearography technique, a holographic measurement method which reliably detects material deformations in the range of microns - faulty areas can be identified clearly and reproduced.

The advantages of optical sensor and measuring technology are:

Online evaluation, enabling direct quality verdict of the casing.
Precise Surface Inspection.
Deformation and Vibration Analysis.
To detect internal injury.


11. Overhead Monorail System 
Our manufacturing shop floor equipped with Overhead Monorail System that helps improve work efficiency and flexibility and the effective use of space. The advantages of the system are to ensure the cleanliness, and thus enhance the product quality and consistency.

The applications of the system included transport of raw materials, work-in-progress, and finished goods between storage buffers and workstations.