Michelin Earthmover offers earthmover tyres for all types of machines: surface mining, underground mining, quarries and construction, industrial handling and port.

Production process

High technology in the production of high quality tyres

The production process

Tyre Production

Performance is assured through the great care taken and quality built in at every stage of production.

Productivity, safety, reduction of the environmental impact…Pushing these aspects of performance to the limit within the same tyre is a real challenge! We achieve this feat on a daily basis thanks to innovation and the continuous search for improved performance, not forgetting the quality of our production processes.

There are numerous stages involved in the manufacture of tyres for Earthmover machines. It’s a complex production process which allies the constraints of heavy industry with the demands of high technology. We use presses which can weigh up to 400 tonnes to cure our tyres.

To offer this level of excellence, the different stages in production follow a strict and methodical process associated with continuous quality control at all stages.

Preparation

The manufacture of an Earthmover tyre involves around 200 components, ranging from raw materials (chemicals, carbon black, sulphur, etc.) to semi-finished products (steel cords, textile fabrics, etc.).

Components Production

Natural rubber 
Latex is collected by making an incision in the bark of the rubber tree. The plantations are to be found mainly in South East Asia, Latin America and Africa. When used in rubber compounds, natural rubber reduces heat build-up inside the tyre when in use whilst also giving it high mechanical strength.


Synthetic rubber
In the tyre industry, 60% of the rubbers used are synthetic rubbers made from hydrocarbons of petroleum origin. Due to the mechanical properties required by the components of the tyre, we have to get the balance of natural and synthetic rubbers exactly right, and this balance varies according to the function required (wear resistance for the tread, resistance to stress for the sidewall, air tightness of the internal rubber).


Black Carbon
First appearing in tyres in 1915, once carbon black is incorporated in rubber compounds, it increases their mechanical strength. It represents about 30% of the composition of rubber compounds and gives the tyre its colour, a colour which also has real defensive strength against ultraviolet radiation to slow down cracking and crazing of the rubber. 


Additives
Additives promote the homogenisation of mixings and make them easier to extrude, and improve their adhesion to the textile plies in casings or to steel cords.


Silica
Derived from sand, silica has properties which have been known for a long while, including improved tear resistance of rubber compounds. 


Metallic reinforcements
Michelin introduced steel into the construction of the tyre as early as 1934. This major technical breakthrough, associated with the development of a coating ensuring a strong physico-chemical bond between rubber and steel, was used on an industrial scale in 1937 in the MICHELIN Metalic tyre for heavy goods vehicles. Since then, steel has constituted the principal structure known as the casing of all Michelin Earthmover and Industrial Truck tyres. Metallic reinforcements give the tyre strength and rigidity. 


Sulphur
Sulphur, a vulcanising agent, makes rubber change from a plastic state to an elastic state. Its action, accompanied by retardants used simultaneously in production optimises the action of heat when the tyre is cured. 


Textile reinforcing
Textile has been used as reinforcing from the very beginning of tyre manufacture. In 2001, thanks to an innovation in textile, among other things, MICHELIN Tyres allowed the Concorde to fly again. Today, textile reinforcing plays an important role in certifying hight performance tyres to run at very high speeds. The materials used today to make textile reinforcing are Polyester, Nylon, Rayon and Aramid which bring resistance, endurance and comfort to our tyres.


Assembly 

Tyre making and finishing are stages of paramount importance during which the skill and experience of our teams is an essential asset for achieving a level of excellence.

Curing

Curing converts the materials in the tyre from the plastic state to the elastic state. This phenomenon, known as vulcanisation, creates the composite structure between the different components of the tyre. Vulcanisation takes place in special presses using the combined action of heat and pressure. This stage may take up to 12 hours, depending on the size of the tyre. It also gives the tyre is shape and final appearance.

Quality control

From reception of raw materials, to the moment the tyres leave the factory, each stage is subject to strict controls. Monitoring and control systems ensure that the production processes conform to Michelin quality requirements. After curing and before shipping, the Earthmover tyre undergoes various verifications: visual, x-ray, ultrasound, uniformity and architecture.

7 production sites throughout the world

2 sites in France, 1 in Spain, 1 in Canada, 1 in Romania, 1 in the United States and 1 in Brazil. The largest production factory is at Lexington in the United States, covering an area of 85000 m².

7 production sites

Lexington (USA)

Opening in 1998

Tyres: 45’’ to 63’’

Certified ISO 9002 and ISO 14001


Campo Grande (Brazil)
Opening 2007
Tyres: 25’’ to 49’'
Certified ISO 9002 and ISO 14001


Vitoria (Spain)

Since 1969
Tyres: 25’’ to 63’’
Certified ISO 9002 and ISO 14001


Le Puy en Velay (France)
Opening 1977
Tyres: 25’’ to 49’’
Certified ISO 9002 and ISO 14001


Montceau-Les-Mines (France)
Opening 1971
Tyres: 24’’ and 25’’
Certified ISO 9001 and ISO 14001


Waterville (Canada) 

Tyres: 24’’ and 25’’


Zalau (Romania)
Tyres : 8’’ to 15’’


It’s thanks to well-trained teams of men and women who share a passion for challenge that Michelin are able to create the best tyres in the world. By focusing on working conditions, the empowerment and safety of all our employees, including the 3500 people working in the Earthmover tyre segment, Michelin have created a strong quality- and performance-orientated company culture which is at the heart of their production capability.


Find the right tyre

Fold down