WORN-OUT TYRE RE-PROCESSING METHOD Russian patent published in 2001 - IPC

FIELD: recovery of polymeric materials. SUBSTANCE: method includes deformation of worn-out tyre by application of axial tensile load to its side rings through corresponding grips and sequential generation of compression waves in liquid. After application of axial tensile load to grips, worn-out tyre is cooled to temperature lower than rubber brittleness temperature of tyre, and tyre is set into rotation around its axis by applying torques M₁ and M₂ to tyre through the same grips. Then tyre is dipped into non-boiling liquid to depth (0,8-1,1)×(R₁-R), where R₁ and R are maximum and minimum radii of tyre in non-deformed state. Compression waves are generated in liquid. Wave amplitude is to be 0.3 - 0.9 MPa and duration 10^-3 - 10μs. These waves act onto all external surface of tyre part dipped in liquid. Temperature of liquid T_l, temperature of tyre T_t and minimum temperature T_L of liquid film boiling should conform to inequality T_L≤T_l+(T_t-T_l)/[1+(λ_lρ_lC_l)^1/2(λ_tρ_tC_tC_t)^-1/2] where λ_l,λ_t is thermal conductivity; ρ_l,ρ_t is density; C_l,C_t is heat capacity of liquid and tyre material, respectively. EFFECT: provision of high workability, reduced consumption of energy, provision of high efficiency. 2 cl, 2 dwg