Tyre scrubbing..?
Tyre scrubbing..?
Just a bit of curiosity really.
Having had several sets of tyres over my driving`life I'm well aware of the fact that they take some scrubbing in (some more than others) before they start to perform properly.
Am I correct in thinking this is primarily down to the release agent used in the molding process..?
Or is there more to it, eg new tread blocks move about and need curing in some way..?
Any info into the mechanisms at work would greatly feed my inquisitive nature..
Cheers,
J
Having had several sets of tyres over my driving`life I'm well aware of the fact that they take some scrubbing in (some more than others) before they start to perform properly.
Am I correct in thinking this is primarily down to the release agent used in the molding process..?
Or is there more to it, eg new tread blocks move about and need curing in some way..?
Any info into the mechanisms at work would greatly feed my inquisitive nature..
Cheers,
J
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From: Slowly rebuilding the kit of bits into a car...
I too was told it was the release agent to !
Exposure to air hardens the rubber over time, so for instance, all the Yokohamas I've bought came wrapped in "shinny" foil !
Digging a finger nail into the tread will give an indication of how "hard" the compound has aged.
DunxC
Exposure to air hardens the rubber over time, so for instance, all the Yokohamas I've bought came wrapped in "shinny" foil !
Digging a finger nail into the tread will give an indication of how "hard" the compound has aged.
DunxC
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Joined: Dec 2007
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From: Scotland
Alan
It is definitely a case of the fresher the better..!
The EVO test last year found this out. Identical tyres, except some of were sourced direct from main supplier and only a few weeks old (manufacture date is stamped on all tyres BTW..). The others were from a 'local' tyre fitter and ~6mths old. These exact same tyres were something like 4 seconds a lap slower, purley due to the aging process/exposure to air..!
This is exacerbated if the tyres are stored without their original wrapping/covers..!
My new tyres were dated 50/07, so around 7-8wks old..
Back to my original question, I seem to remember Graham (aka 911) commenting a while ago about the effects of tread 'shuffle' on new tyres. Hence hill climbers use 90% MOT worn tyres for racing.
I recon this is why there are so many conflicting opinions about tyres..! If you're running >50% worn anything they're probably going to 'feel' better than the equivalent brand new tyre. The only area you may feel the new tyre is superior is very wet conditions, where the deeper tread blocks shift the water.
IMHO there's probably about a 2k window where tyres are at their best all round ability..
Lol, tyres, the dark art..!
The EVO test last year found this out. Identical tyres, except some of were sourced direct from main supplier and only a few weeks old (manufacture date is stamped on all tyres BTW..
). The others were from a 'local' tyre fitter and ~6mths old. These exact same tyres were something like 4 seconds a lap slower, purley due to the aging process/exposure to air..!This is exacerbated if the tyres are stored without their original wrapping/covers..!
My new tyres were dated 50/07, so around 7-8wks old..
Back to my original question, I seem to remember Graham (aka 911
) commenting a while ago about the effects of tread 'shuffle' on new tyres. Hence hill climbers use 90% MOT worn tyres for racing.I recon this is why there are so many conflicting opinions about tyres..! If you're running >50% worn anything they're probably going to 'feel' better than the equivalent brand new tyre. The only area you may feel the new tyre is superior is very wet conditions, where the deeper tread blocks shift the water.
IMHO there's probably about a 2k window where tyres are at their best all round ability..
Lol, tyres, the dark art..!
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RElease agent
Most of the major manufacturers do not use a release agent in the production of tyres now, it is not needed. New tyres just need the surface scrubbing as the mould leave the surface of the tread smooth. I will try and find the article and post it up.
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and here it is
Rubbers
Rubber comes in many forms, nowadays all synthetic.
The aluminium segmental moulds used to produce tyres will require different coatings for different rubbers. For standard silicon rubber an anodic composite coating such as Apticote 350 will be ideal, whereas carbon black rubber will require a nickel alloy or nickel composite coating such as Apticote 450,460G or 200A. Applied correctly, they will last for years. Steel moulds will accept Apticote 400 and 450 but not Apticote 350, which is designed for light alloys.
The steel moulds used to produce Viton and Neoprene seals will need a coating such as Apticote 460G. Its combination of hardness and lubricity is designed to produce the best results and long life for high volume applications.
And the steels moulds used for very abrasive memory rubbers will need a nickel composite such as Apticote 450, a unique nickel alloy composite designed for even lower friction and greater load carrying capacity. However, depending on the application speed and volume, even using this coating, moulds could need re-coating every 3 months.
Coatings such as Apticote 200, 350, 450 and 460, which are already used extensively for tyre moulding applications, have excellent release properties and are extremely resistant to the high temperatures and aggressive materials used in tyre manufacture.
For the production of larger tyres, where sidewall plates are used, special Apticote nickel/chrome duplex coatings have been developed with exceptional wear and corrosion resistance, to reduce the pitting corrosion caused by heat and carbon gases.
Coatings can also be modified to provide the gloss or matt finishes that are required to meet the standards of certain high-end OEMs.
Rubber comes in many forms, nowadays all synthetic.
The aluminium segmental moulds used to produce tyres will require different coatings for different rubbers. For standard silicon rubber an anodic composite coating such as Apticote 350 will be ideal, whereas carbon black rubber will require a nickel alloy or nickel composite coating such as Apticote 450,460G or 200A. Applied correctly, they will last for years. Steel moulds will accept Apticote 400 and 450 but not Apticote 350, which is designed for light alloys.
The steel moulds used to produce Viton and Neoprene seals will need a coating such as Apticote 460G. Its combination of hardness and lubricity is designed to produce the best results and long life for high volume applications.
And the steels moulds used for very abrasive memory rubbers will need a nickel composite such as Apticote 450, a unique nickel alloy composite designed for even lower friction and greater load carrying capacity. However, depending on the application speed and volume, even using this coating, moulds could need re-coating every 3 months.
Coatings such as Apticote 200, 350, 450 and 460, which are already used extensively for tyre moulding applications, have excellent release properties and are extremely resistant to the high temperatures and aggressive materials used in tyre manufacture.
For the production of larger tyres, where sidewall plates are used, special Apticote nickel/chrome duplex coatings have been developed with exceptional wear and corrosion resistance, to reduce the pitting corrosion caused by heat and carbon gases.
Coatings can also be modified to provide the gloss or matt finishes that are required to meet the standards of certain high-end OEMs.
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