JPH0249439B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reinforced rubber hose with excellent pressure resistance and impact resistance, and a method for manufacturing the same.

Reinforced rubber hoses are widely used as fluid transfer pipes, pressure transmission pipes, etc. in industrial, aircraft, and marine applications. For example, as shown in FIG. 1, this hose is composed of an inner surface rubber 1 constituting an inner tube, a reinforcing layer 2 made of wire or fiber, and an outer protective cover layer 3 made of resin or rubber material.

Traditionally, when manufacturing such hoses,
The reinforcing layer 2 was braided or spirally braided while the inner rubber 1 was in an unvulcanized or semi-vulcanized state. However, when the inner surface rubber 1 is unvulcanized, the reinforcing layer 2 partially bites into the inner surface rubber 1 and the braiding disorder of the reinforcing layer 2 occurs, as shown in FIG. 1 may need to be cooled and hardened in advance, or the inner rubber 1 may need to be cooled and hardened in advance.
There are drawbacks such as dimensional disturbances caused by rubber flow during vulcanization. Furthermore, when the inner rubber 1 is semi-vulcanized, the surface of the inner rubber 1 is completely free of tack, so the inner rubber 1 and the reinforcing layer 2 are bonded together through the adhesive layer 4 as shown in FIG. Since various adhesive treatments such as etc. must be performed, the manufacturing process has the disadvantage of becoming complicated.

The present invention was made in view of the above-mentioned circumstances in order to simplify the manufacturing process and stabilize product performance, and provides a reinforced rubber hose with stable pressure resistance and impact resistance, and an advantageous manufacturing method thereof. The purpose is to provide.

For this reason, the reinforced rubber hose of the present invention is characterized in that a reinforcing layer is provided on the outside of the inner rubber whose outer surface has been hardened by radiation irradiation, and its manufacturing method includes extruding the inner rubber and then It is characterized in that the surface of the inner rubber is irradiated with radiation to harden the outer surface of the inner rubber, a reinforcing layer is applied on the outside of this outer surface, and then vulcanization is performed.

Embodiments of the present invention will be described in detail below with reference to FIGS. 4 and 5. In these figures, the same parts as in FIGS. 1 to 3 are represented by the same numbers.

In FIG. 4, a reinforced rubber hose A has a hardened layer a formed on the surface of an inner rubber 1, and a reinforcing layer 2 on the surface of this hardened layer a. The cured layer a is formed by curing the outer surface of the inner rubber 1 by irradiating the surface of the inner rubber 1 with radiation, and has a thickness of approximately several microns to several millimeters.

To manufacture this reinforced rubber hose A, first,
An unvulcanized inner rubber 1 made of natural rubber or synthetic rubber (CR, NBR, SBR, etc.) is extruded using an extruder. Next, the entire circumferential surface of this inner rubber 1 is irradiated with radiation. The radiation dose in this case is
It is sufficient if it is about 1 Mrad to 30 Mrad. Due to this irradiation, the outer surface of the inner rubber 1 is hardened to form a hardened layer a.
is formed. Next, the reinforcing layer 2 is laminated on this hardened layer a. In this case, since the cured layer a is an extremely thin layer and does not lose its adhesiveness, the inner rubber 1 and the reinforcing layer 2 will stick to each other. Next, vulcanization is performed by a conventional method. The thus obtained reinforced rubber hose A has stable pressure resistance and impact resistance because the inner rubber 1 and the reinforcing layer 2 are in close contact with each other through the hardened layer a, as shown in FIG. become.

As described above, according to the present invention, since the surface of the inner rubber is hardened by radiation irradiation, there is no need for various adhesive treatments, so the manufacturing process can be simplified, and dimensional fluctuations can be reduced. Since this does not occur, product performance can be stabilized. The present invention is applicable to various hoses ranging from low pressure hoses to high pressure hoses.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of an example of a conventional reinforced rubber hose, FIGS. 2 and 3 are explanatory cross-sectional views thereof, and FIG. FIG. 5 is an explanatory cross-sectional view thereof. DESCRIPTION OF SYMBOLS 1... Inner surface rubber, 2... Reinforcement layer, 3... External protective cover layer, 4... Adhesive layer, a... Cured layer, A... Reinforced rubber hose.

Claims (1)

[Scope of Claims] 1. A reinforced rubber hose, characterized in that a reinforcing layer is provided on the outside of an inner rubber whose outer surface is hardened by radiation irradiation. 2. After extruding the inner rubber, the surface of the inner rubber is irradiated with radiation to harden the outer surface of the inner rubber, a reinforcing layer is applied to the outside of this outer surface, and then vulcanization is performed. A method for manufacturing reinforced rubber hoses.