| 摘要 |
<p>PURPOSE:To make it possible to release and remove a steel cord layer mechanically, economically and efficiently, by cutting off side wall sections, cutting a suitable point of the annular tread transversely, and passing the tread between a pair of grooved rolls whose circumferential speeds are different. CONSTITUTION:A steel cord type tire 1 consists of right and left side wall sections 2, 2 including bead sections, shoulder sections, etc. and a tread 3. The tread 3 includes an outer rubber layer 4 and a steel cord layer 5 comprising an intermediate steel layer 5A and an inner cotton cord layer 5B. The side wall sections 2, 2 are cut off, the annular tread 3 is taken out, and a suitable point of the tread 3 is cut transversely to make the tread 3 belt-shaped. Then the tread 3 is passed between a pair of rolls 6, 7. The rolls 6, 7 have a plurality of grooves 8, 9 in the outer circumferential surfaces and are driven with their circumferential speeds differed. The tread 3 is passed between the rolls 6, 7 several times, and since in this case the elastic coefficients, Poisson's ratio and elongations of the rubber layer 4 and the steel cord layer 5 are different significantly, the steel cord layer 5 is released from the rubber layer 4.</p> |
