Pneumatic radial tire and process for producing retreaded tire

摘要

A pneumatic radial tire includes: at least one carcass layer suspended across left and right bead parts; a belt layer arranged on an outer circumferential side of the carcass layer; and a tread arranged on an outer circumferential side of the belt layer. The tread has a laminated structure in which a thermoplastic film layer of a thermoplastic resin or a thermoplastic elastomer composition is interposed between a tread-side rubber layer and a belt layer-side rubber layer. The thermoplastic elastomer composition is obtained by blending an elastomer in a thermoplastic resin. A process for producing a retreaded tire includes the steps of: forming a base tire from the pneumatic radial tire by softening the thermoplastic film layer through heating so as to separate and remove the tread-side rubber layer, the pneumatic radial tire having the tread worn away; and subsequently bonding a new tread-side rubber layer onto the base tire.

主权项

1. A pneumatic radial tire comprising:
at least one carcass layer suspended across left and right bead parts; a belt layer arranged on an outer circumferential side of the carcass layer; and a tread arranged on an outer circumferential side of the belt layer, wherein the tread has a laminated structure in which a thermoplastic film layer, made of any one of a thermoplastic resin and a thermoplastic elastomer composition obtained by blending an elastomer in a thermoplastic resin, is interposed between a tread-side rubber layer and a belt layer-side rubber layer, wherein a thickness of the belt layer-side rubber layer is not less than 2 mm and not more than 5 mm, wherein when the tread is sufficiently heated the thermoplastic film layer is softened by the heating whereby the tread-side rubber layer can be separated from the belt-side rubber layer at the softened thermoplastic film layer without a buffing operation, a thickness of the thermoplastic film layer is 50 to 150 μm, the thermoplastic film layer is placed intermittently in a tire meridian cross section, and a density of the placement of the thermoplastic film layer in a tire center portion is higher than the density of the placement in a tire shoulder portion.