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Re: Firestone tires
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Posted by Steve IA on July 10, 2000 at 13:28:34 from (206.72.27.97):
In Reply to: Firestone tires posted by Philip Croff on July 09, 2000 at 20:14:14:
Funny you should ask. I work at Firestone Ag Tire in Des Moines, and can remember the 'gum dip' tank. The tire cords (nylon, polyester, whatever) were woven into loose fabric and put on rolls thousands of feet long and about 8 ft wide.
These rolls would be drawn through a dip tank filled with liquid latex (gum rubber) and dried.
This was done before the fabric was coated with compounded rubber (rubber, carbon black, oils, chemicals). This coated fabric was then cut to size to be built into tires.
The gum dipping theoretically increased the adhesion between the cords and the compounded rubber to reduce belt slippage in high torsion applications like farm tires.
The tire cord fabric is now treated with more modern adhesive material at the textile manufacturer's plant. Probably cheaper, better, more environmentally friendly, and a lot less messy.
Steve IA
Riding on the tires I helped build.
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