PURPOSE: To restrain the inner diameter of an inner rubber layer from changing due to the longitudinal tension, by winding reinforcing threads onto the surface of a hollow inner rubber layer, applying longitudinal threads longitudinally to the hollow inner rubber layer, feeding the hollow inner rubber layer longitudinally while a cover rubber layer is being formed, and performing the vulcanization.
CONSTITUTION: For instance, the hollow inner rubber layer 10 is molded by an extruder 2, and after it is cooled, an adhesive is applied on the outer surface thereof, and the ends of the longitudinal threads 42 on spools 44 are stuck to the inner rubber layer 10 and the inner rubber layer 10 is fed longitudinally. In this case, if grooves 48 are provided in the outer surface of the inner rubber layer 10, it is preferred that the longitudinal threads 42 are set in the grooves 48. On the other hand, braiders 40 wherein reinforcing threads 12 are loaded are rotated coaxially with the rubber hose layer 10 so that the reinforcing threads 12 are wound onto the outer surface of the inner rubber layer 10. While the inner rubber layer 10 on which the reinforcing threads 12 are wound and the longitudinal threads 42 are stuck is fed longitudinally, the cover rubber layer 14 is formed thereon, and the vulcanization is carried out by heated steam in an autoclave.
HONNA SHIROU
NAKAMURA YASUTAKA
KITAYAMA HIROSHI
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