JP2606531Y2 - Rubber hose with reinforcing yarn layer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber hose provided with a reinforcing yarn layer, and more particularly to a rubber hose provided with a reinforcing yarn layer formed by knitting or spirally winding a reinforcing yarn on the outside of an inner rubber tube. About.

[0002]

2. Description of the Related Art Hitherto, a pressure-resistant rubber hose has been manufactured by providing a reinforcing thread layer outside an inner rubber pipe and extruding and covering the outer rubber pipe with the reinforcing thread layer. The reinforcing yarn layer is formed by knitting the reinforcing yarn or winding it in a spiral shape. When spirally wound, the second layer is wound in the opposite direction to the first layer in order to improve the pressure resistance. If the outer rubber tube is directly extruded and coated on the second layer, the spiral of the second layer may be disturbed by the extrusion pressure. For this reason, in order to prevent the second layer from being disturbed when the outer rubber tube is extruded and covered, a third layer is formed by winding a thread disturbance preventing layer in a direction opposite to that of the second layer. I have.

FIG. 3 is an explanatory view showing a part of a manufacturing process of a rubber hose provided with a conventional spiral reinforcing yarn layer.
That is, the inner rubber tube 5 is placed on the mandrel 1 by the extruder 3.
Is pushed out, and the first rubber
The first reinforcing yarn layer 9 is formed by being spirally wound by the blader 7. Next, the first reinforcing yarn layer 9
A second reinforcing yarn layer 11 having a winding direction reversed by a second braider 10 is formed outside the reinforcing yarn layer 11. Further, in order to prevent the second reinforcing yarn layer 11 from becoming distorted,
The yarn disorder preventing layer 15 having the winding direction opposite to that of the second layer is formed by the blader 13. An outer rubber tube 19 is tightly covered by an extruder 17 on the outside of the yarn disturbance preventing layer 15.
Finally, these rubber hoses are vulcanized.

Regardless of the method used to form the reinforcing yarn layer, it is necessary to suppress foaming due to air, moisture or oils in the rubber or yarn during vulcanization. To suppress foaming, vulcanization is performed by applying a constant pressure to the outer circumference of the rubber hose. Conventionally, as a method of applying a constant pressure to the outer periphery of a rubber hose, a method of using a pressurized vulcanizer or a method of applying a pressing force by coating the outer periphery of a hose with a synthetic resin or lead or the like is known.

[0005]

In recent years, synthetic fiber yarns have been widely used as reinforcing yarns for rubber hoses instead of natural fiber yarns. The synthetic fiber yarn has the following problems since the gas transmission is lower than that of the natural fiber yarn. That is, gas is generated from the rubber during vulcanization of the rubber hose. The gas generated on the surface side of the outer rubber tube is discharged outward, and the gas generated on the inner surface side of the inner rubber tube is discharged through the space between the mandrel. However, since the synthetic fiber yarn has poor gas transmission, the gas generated in the intermediate portion is not released and a gas reservoir is formed in the reinforcing yarn layer. Since the reinforcing yarn contains air, moisture, oils, and the like, the gas pool is further increased, causing the rubber hose surface to partially swell.

[0006] The rubber hose formed by winding the reinforcing yarn layer in a spiral shape instead of the knitting method has the following problems. That is, in the case of the reinforcing yarn layer wound in a spiral shape, the reinforcing yarn layer has two reinforcing yarn layers in which the winding directions are reversed, and further, the third layer has a yarn disorder that prevents the second layer from becoming disordered. The prevention layer 15 is provided. When the outer rubber tube is extruded and coated on the third layer, the yarn disturbance prevention layer 15 itself is disturbed by the extrusion pressure. Since the third layer is not a reinforcing layer, it does not affect the performance of the rubber hose, but is not preferable in appearance. In addition, a braider for winding the third layer is required, which lowers the production efficiency and increases the cost.

[0007]

The purpose of the present invention is to provide a vulcanizing device that can prevent vulcanization of the reinforcing yarn layer due to the extrusion pressure of the outer rubber tube and vulcanization under normal pressure by preventing gas pooling. It is an object of the present invention to provide a rubber hose provided with a reinforcing yarn layer that enables the above.

[0008]

SUMMARY OF THE INVENTION The present invention aims at achieving the above object.
To achieve this, the following configuration was adopted. That is, the inner rubber tube
A reinforcing yarn layer is provided outside the reinforcing yarn layer, and an outer rubber is provided outside the reinforcing yarn layer.
In a rubber hose formed by covering a pipe, the reinforcing yarn layer
Formed with synthetic fiber yarn, inside or outside the reinforcing yarn layer
A hose that uses spun yarn, a natural fiber yarn, as a degassing yarn
It is characterized by being inserted vertically. The degassing yarn
Is meandering or wound at a large pitch
Can be. Further, the reinforcing yarn layer is formed by braiding,
Insert the degassing yarn inside or outside the reinforcing yarn layer
You may. Winding the reinforcing yarn layer in a spiral shape
Two reinforcing yarn layers having opposite directions, and the first reinforcing yarn
Even if a gas release yarn is inserted between the layer and the second reinforcing yarn layer
Good.

[0009]

[Function] The gas generated in the reinforcing yarn layer during the vulcanization of the rubber hose is easily transmitted through the degassing yarn and escapes .
The thread works to prevent the formation of gas pockets. In the case of a rubber hose formed by spirally winding a reinforcing yarn layer, the degassing yarn is a natural fiber yarn and is provided between the first reinforcing yarn layer and the second reinforcing yarn layer. Since it is inserted, slippage of the second reinforcing yarn layer is reduced, and it works to prevent the yarn from being disturbed when the outer rubber tube is pushed and covered.

[0010]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. Figure 1 is a reinforcing yarn layer formed by winding spirally on the outside of the inner rubber tube, the longitudinal direction of the hose thread venting
Partial front view of those inserted in direction, FIG. 2 is a likewise cross-sectional view. A synthetic fiber yarn is spirally wound around the outside of the inner rubber tube 20 to form a first reinforcing yarn layer 21, and the same synthetic fiber yarn is formed outside the first reinforcing yarn layer 21. Winding in the opposite direction forms a second reinforcing yarn layer 25, and furthermore, a natural fiber yarn is used between the first and second reinforcing yarn layers.
The degassing thread 25 is inserted in the longitudinal direction of the hose .

The inner rubber tube 20 is preferably made of rubber that does not foam during normal pressure vulcanization. As the synthetic fiber yarns forming the first and second reinforcing yarn layers 21 and 23, synthetic fiber yarns such as polyester, vinylon, nylon, and aramid can be used. Degassing thread 25
Use natural fiber yarns such as cotton and hemp that can easily transmit gas. The degassing thread 25 does not need to be strong because it does not prevent elongation during hose manufacture. Therefore, a yarn having a low tension such as a spun yarn is preferable. Further, since it is not intended to prevent the elongation of the hose, meandering is not limited to be inserted linearly along the axis of the hose, or while winding with a large pitch e
It can be inserted in the vertical direction of the case.

Further, in the case of a rubber hose provided with a reinforcing yarn layer wound in a spiral shape as shown in the figure, the slippage of the second reinforcing yarn layer 23 is reduced and the yarn is prevented from being disturbed. It is preferable to use natural fiber yarns coated with rubber glue or RFL-treated. In the above embodiment, the hose in which the reinforcing fiber layer is formed by spirally winding the synthetic fiber yarn has been described. However, it is obvious that the present invention is also applicable to a hose in which the reinforcing fiber layer is formed by braiding. In this case, the degassing yarn is inserted inside or outside the reinforcing yarn layer.

[0013]

[Effects of the Invention] In the rubber hose according to the present invention, the gas in the rubber hose during vulcanization is easily released because the degassing thread having a weak tension is inserted in the longitudinal direction of the hose, so that normal pressure vulcanization is possible. become. Since no vulcanizing equipment is required,
Equipment costs and running costs are reduced, and the working environment is improved. In addition, if the gas release yarn is inserted in the longitudinal direction of the hose between the spirally wound reinforcing yarn layers, the yarn will not be disturbed when the outer rubber tube is pushed out, which may cause poor appearance. And the non-defective rate is improved. Furthermore, since there is no need to provide a yarn turbulence prevention layer as in the related art, adjustment during extrusion of the outer rubber tube can be easily performed. In addition, since the yarn for degassing can be a yarn with a weak tension and can be inserted while winding meandering or winding at a large pitch, there is no disadvantage in use and performance without impairing flexibility. Does not occur.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which a degassing yarn is inserted between reinforcing yarn layers formed by spirally winding.

FIG. 2 is a sectional view of the same shown in FIG.

FIG. 3 is an explanatory view showing a part of a manufacturing process of a rubber hose provided with a conventional spiral reinforcing yarn layer.

[Explanation of symbols]

Reference Signs List 20 inner rubber tube 21 first reinforcing yarn layer 23 second reinforcing yarn layer 25 gas release yarn

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 11/00-11/26

Claims (4)

(57) [Scope of request for utility model registration] 1. A rubber hose comprising a reinforcing yarn layer provided outside an inner rubber tube and an outer rubber tube coated outside the reinforcing yarn layer, wherein the reinforcing yarn layer is formed of synthetic fiber yarns. Spun yarn, which is a natural fiber yarn, inside or outside the
A rubber hose provided with a reinforcing yarn layer, which is inserted in the longitudinal direction of the hose as a degassing yarn . 2. The rubber hose provided with a reinforcing yarn layer according to claim 1, wherein the degassing yarn is meandered or wound at a large pitch. 3. A reinforcing yarn layer formed by braiding, the moth
The rubber hose provided with a reinforcing yarn layer according to claim 1 or 2, wherein the thread for pulling out is inserted inside or outside the reinforcing yarn layer. 4. A reinforcing yarn layer is wound in a spiral shape to form two reinforcing yarn layers with winding directions reversed, and gas is vented between the first reinforcing yarn layer and the second reinforcing yarn layer. Yarn for hose vertical
The rubber hose provided with a reinforcing yarn layer according to claim 1 or 2, wherein the rubber hose is inserted in a direction .