By Paul Norman
For a French company, Hutchinson has a very Anglo-Saxon sounding name. That’s because the company was set up in 1853 by US businessman Hiram Hutchinson. Attracted by the grants offered by Napoleon III, Hutchinson moved his rubber making machines from the US to set up in Montargis, around 100km south of Paris.
Hutchinson is still on the same site, with one of the original buildings, which has a roof designed by Gustav Eiffel, used as a training and media centre. Today, Hutchinson makes around 5000 tyres a day, not just in its own name but for other well-known bike brands. It also makes parts for automotive, railway and aerospace applications and employs over 40,000 people worldwide.
New rubber development
Hutchinson puts a lot of resources into research and development, with around 300 people working in its labs. There’s a pilot-size rubber mixing facility, which can make test batches of between 300g and 3kg for physical and chemical characterisation.
When it introduced its latest Fusion 5 tyre a couple of years ago, Hutchinson’s chemists felt that they could improve on the formulation of the compound used. The result was the company’s new 11Storm rubber, which is used in all its Fusion 5 tyres manufactured after May 2017.
A new compound undergoes a battery of tests of its physical characteristics and chemical composition before launch. The labs use advanced techniques including electron microscopy, nuclear magnetic resonance and X-ray tomography to understand the structure of a prototype rubber sample.
There’s also a large computing facility. For a new bicycle tyre, this is used to simulate the effect of turning and hitting obstacles on the prototype tyre’s casing.
The process of making a cycle tyre starts in the rubber mixing plant. This produces around 40 tonnes of rubber compound a day from two mixers. A batch may include around 30 different ingredients, including different grades of natural and synthetic rubber, plasticising agents, carbon black and sulphur.
The different components of a cycle tyre are manufactured in separate processes in other parts of the plant. The casing is made of woven nylon, with either 60 or 120 threads per inch. This is coated with rubber, using a machine which originally dates from 1910. Because a 120tpi casing requires less rubber to coat it than a 60tpi casing, it’s thinner and more subtle. Casings are cut to size on the diagonal from the rubber-coated sheet.
The beads are also pre-coated with rubber before tyre assembly. Hutchinson uses steel wire, Kevlar or carbon fibre. Carbon fibre is used for the beads of tubeless-ready road tyres.
Tyres are assembled from their components by hand on a rotating metal drum. First the casing is laid down, then the beads are added, guided by laser. Finally, the under-tread protection and the rubber for the tread are added and the ends of the tread heat sealed together, before the logos are added.
Then it’s time to vulcanise the tyre, to harden up the casing and seal the different components together. This process uses steam and pressure to heat the tyre to 269C for between 3 and 6 minutes. The metal dies used also add the tread to the tyre.
Completed tyres are checked twice for visual defects, before going off-site to be packaged. There’s a quality control lab alongside the factory floor, which tests tyres for rolling resistance, ozone stability, snakebite resistance, bead stretch and other properties. One machine tests resistance to bursting when the tyre is overinflated.
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