GREEN TYRE WEIGHING SYSTEM
(USED IN THE TYRE MANUFACTURING PROCESS)
Tyres are made in a manufacturing process with 5 stages; blending, milling, building, curing and inspection.
In the blending stage, various ingredients like natural and synthetic rubbers, carbon black, silica, oil, antioxidant etc. are used. A black, sticky, composite rubber mixture is created.
In the milling stage, cooled rubber is cut into strips to form the basic shape of the tyre itself. Other elements of the tyre are prepared and processed during the milling stage.
Then, the building stage occurs;
- All the components such as the steel belts, textile elements, rubber etc. are assembled on a tyre building machine at precise locations.
- This combination, built as a single component, is called a green tyre.
- The weight of the green tyre is checked, to determine if it’s within the desired range. If not, the green tyre is rejected and it will then be checked for any force variation, imbalance, bulge parameters and/or visual defects.
- A Green Tyre Weighing System is critical within this process stage. Even if there is any slight variation from the required weight, the green tyre is discarded and will not continue to the curing process.
Finally, the green tyre is formed into the desired shape and size under heat and pressure during the curing press. Curing binds all the components together, along with the tread design and sidewall nomenclature.
The final stage is inspection before packaging and despatch to the customer.
A. Weighing Platform B. Load Cell Arrangement (With platform removed for clarity)
Weighing is done using Thames Side Sensors Load cells and a Weighing Indicator. The Green Tyre is manually placed on the platform where the weighing is done. As shown in image B, bending beam load cells (Model T66) along with a conventional LA66 mounting assembly are used. Thames Side T66 load cells are hermetically sealed and are entirely manufactured using stainless steel giving a protection class of IP68 and IP69K. The T66 loadcells have accuracy class of C3 (Optional C6), which makes them the perfect choice for this application requiring very precise weighing components.
C. Load Cell (Model T66) and Conventional Mounting Assembly (Model LA66)
The high-speed XT1000 weighing indicator captures the incoming weight data at the rate of 2400 measurements/second. It has extremely high resolution (24-bit ADC) & 16,000,000 internal divisions; this is also the perfect choice for such a demanding application.
D. Weighing Indicator (Model XT1000)
This technical note serves only as guidance and not as a contractual specification. The individual product specifications should be taken from the relevant product data sheets and the standards, to which reference has been made in this technical note. Thames Side Sensors reserves the right to amend this application note at any time without prior notice.