Laminated pneumatic tire and method of making same

Details Laminated pneumatic tire and method of making same Laminated pneumatic tire and method of making same

B - Operations, Transporting

60

C

18/125

B60C 13/00 (2006.01)

Patent

CA 1066467

ABSTRACT OF THE DISCLOSURE A process for making a laminated pneumatic tire is disclosed. The tire may be free of reinforcing fabric and is made of a substantial number of alternating layers of high-modulus and low-modulus polymeric material. The process includes applying to an annular form a first continuous layer having a viscosity less than 100,000 centipoises at 30°C, then partially curing the layer, and thereafter applying to the first layer a continuous layer of a second polymeric material. This process is then repeated to form a laminate. The alternating hard and soft layers provide the tire with a necessary durability and resistance to flex cracking. The tire may contain low-modulus polymeric layers with a Young's flexural modulus from 100 to about 5000 per square inch. The high-modulus layers of the tire may have a Young's modulus from 3000 to 50,000 or higher. The laminate is heated and cured while it has a general toroidal shape. The cured material of each layer has a Shore A durometer hardness of at least 20. The high-modulus layers have a tensile modulus at 10 per cent elongation in any direction which is at least twice that of the low-modulus layers.

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