01 September 2010

Tubless Tyres




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The innerliner is made of halobutyl compound. (Normal tube compound is based on butyl rubber, which is not compatible with natural and synthetic rubbers. Hence we have to use halobutyl compound which is compatible with natural and synthetic rubbers). This acts as an impermeable membrane inside the tyre preventing the air loss.




As against the normal practice of using fabric chafer in tube type tyre, the same is replaced with rubber chafer in tubeless tyres. This ensures the sealing of the tyre with rim for sealing.




A special valve is used as there are no tubes.




In case of a small puncture the rate of air loss is slow as the halobutyl layer is bonded to the carcass. It seals itself like in an injection bottle. In a tube type tyre, the tube is independent of the tyre and in case of puncture, it deflate fast. The slow rate of air loss makes tubeless tyres safer.




There are no tubes. Hence tube related problems also.




Reduction in overall weight of the tyre rim assembly. Hence better fuel-efficient. (Approximately around 1%)











There are 3 repairing methods available in the Indian market i.e. Plug method, Filler method and Patch method




A, PATCH METHOD Tools and Material used



File

For roughening the surface of the area to be repaired.

Patched
Readymade patches are available in the market, price depending upon the size used. Some repairers use their own patches made out of damaged tubes.

Solution
Adhesive used for applying the patch.



DISADVANTAGE

Applying a patch inside the tyre stops air leakage due to puncture, however the steel belts get exposed to water, moisture, dew, etc. from outside which might lead to cut separation damage.


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B, PLUG (MUSHROOM) METHOD Tools and Material used


Hand Drill
Used for cleaning and making the hole proper.

Inserter
Used for inserting the plug stem into puncture hole.

Solution
Adhersive used for applying the plug.

Blades
Used for trimming the extra repair compound above puncture surface.


Advantage
This method is the proper and effective method of tubeless repair. The repair from tyre inside gives a permanent, strong and airtight repairing.



Repairing using plug method


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C, FILLER METHOD Tools and Material used

Probe

Used for displacing the steel cords for easy applications of repair compound, without enlarging the hole or removing any rubber from the tyre.


Repairing Tool (Allen Wrench)
Used for placing the repair compound in place perfectly.

Repair compound
Used for filling the puncture. It forms bond with the tyre compound after application.

Solution
Adhesive used for applying the filler material.

Blades
Used for trimming the extra compound above puncture surface outside the tyre.


Advantages
In this method it is not necessary to de-mount the tyre from rim, thus there is no need to do the balancing again and also there is no chance of bead damage.



Disadvantages
Stiff ridges are formed on the inner liner of the tyre due to hardening of the repair compound which prohibits further use of tubes with the tyre. (If tube has to be used, then proper grinding of tyre inner surface has to be done, to remove the hardened repairingcompound).



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TUBE TYPE AND TUBELESS TYRE


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Conclusion
In case of a small puncture the rate of air loss is slow as the halobutyl layer is bonded to the carcass. It seals itself like in an injection bottle. In a tube type tyre, the tube is independent of the tyre and in case of puncture, it deflate fast. The slow rate of air loss makes tubeless tyres safer.A special valve is used as there are no tubes.Thereare no tubes. Hence tube related problems also .Reduction in overall weight of the tyre rim assembly. Hence better fuel-efficient. (Approximately around 1%).















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