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When choice a bladder to used in curing process, correct bladder size is crucial! The steps below are the way to choice the suitable bladder for different size of tires.

Step 1.

Measure your tire’s periphery and inside diameter. Measure MYPOL bladder’s outside diameter and periphery marked as (D) and (C)

Step 2.

          
Calculate the following:

• 
  
• The formula of the sectional stretch (SS or Peripheral Stretch) (%)

=    (Tire Periphery – Bladder Periphery) x 100

    (Bladder Periphery)

• The Circumferential stretch (%)
• 
  
• = (Inside Tire Diameter – Outside Bladder Diamtr) x 100

(Outside Bladder Diamtr)

Step 3.

The optimum stretch range is shown in the following table :

Bladder life and performance can be improved if the right type of bladder is used.

Barrel type bladders must stretch considerably when curing radial tires (up to 100%) while a toroidal bladder will only stretch 30%. This affects bladder life, shortening it and also, uniformity of tires, as barrel bladder’s large expansion may not be uniform around its perimeter, stretching more in some areas than in others.

Step4.

How to calculate the bead clamping compression. Follow the example footage:

Bead Compression =(25 x 12.5) – (12.5 x 22.5) x 100 = 10 %

                     (25 x 12.5)

Neck Compression=(12.25 x 12) – (10 x 12) x 100 = 18.37 %

                     (12.25 x 12)

 *) Recommended percentage between 5% and 15%


Confusing with that formula? We will help you to choose your bladders type. We are very glad if you want to know about our products and try to use it.

For the product sample to used in your curing process utility, please completed this form. We will send you for free and choose the match sample for all your tire's size.