JPS59200886A - Rubber hose containing reinforcing cord and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reinforced prefilled rubber hose, and more particularly to a novel configuration of its reinforcing thread layer and its manufacture.

Conventionally, reinforcing threads have been inserted into the walls of rubber tubes to improve the strength of rubber hoses. This reinforced prefilled rubber hose is generally manufactured as follows.

That is, a mandrel with a thickness corresponding to the inner diameter of the rubber hose is fed to an inner comb presser, where an inner rubber layer of a predetermined thickness is formed on the mandrel, fed out, and cooled in a cooling tank. The inner rubber layer is then fed to a braider, where it is typically wound with a plurality of reinforcing threads in a spiral manner. If the reinforcing yarns are all wound in the same direction, the hose strength will be insufficient, so usually half of the reinforcing yarns are wound in opposite directions.

That is, first, the first layer S/J? An irral thread layer is formed,
A second layer of spiral yarn in the opposite direction is formed on top of that. Next, the hose material on which the reinforcing thread layer has been formed is fed to an outer rubber extruder, where an outer rubber layer of a predetermined thickness is formed on the reinforcing thread layer, and then sent out and cooled in a cooling tank. It will be done.

Next, it is wound onto a drum for vulcanization, placed in a vulcanization pot, and vulcanized, thereby completing the production of the reinforced pre-filled rubber hose. However, in reality, the mandrel is then pulled out and cut into a predetermined size.

Although the reinforcing thread layer of the rubber hose manufactured in this way is useful for improving the strength of the hose, the reinforcing thread layer is
Since the second spiral-shaped reinforcing yarn is immediately wound on top of the second spiral-shaped reinforcing yarn, misalignment is likely to occur in this part. That is, during manufacturing, if the second reinforcing thread is wound and touched by something, the regularity of the thread is easily disturbed, and furthermore, the arrangement of the reinforcing thread is also likely to be disturbed when the outer rubber layer is applied.

the! However, if the outer rubber layer is coated and vulcanized, a rubber hose with partially uneven strength will be obtained, which is undesirable. Further, even after the product is manufactured, sagging is likely to occur between the first reinforcing thread and the second reinforcing thread, which may cause the hose to separate into two layers, the inner and outer layers. Such separation is particularly likely to occur from the hose ends. In this case as well, the overall hose strength is reduced.

In view of the above-mentioned current situation, the present invention has been made in order to provide an improved reinforced pre-filled rubber hose in which the strength of the reinforcing thread layer does not deteriorate.

That is, the reinforcing thread-containing rubber hose of the present invention has a reinforcing thread layer that includes a first reinforcing thread spirally wound on an inner rubber layer, an adhesive layer coated on top of the first reinforcing thread, and the first reinforcing thread coated on top of the first reinforcing thread. It is characterized by consisting of a second reinforcing thread that is spirally wound in the opposite direction to the thread.

In the reinforced pre-filled rubber hose of the present invention, the first reinforcing thread is spirally wound around the outer surface of the unvulcanized hollow inner rubber layer, an adhesive is applied on top of the first reinforcing thread, and then an adhesive is applied on top of the first reinforcing thread. The method of the present invention is characterized in that the second reinforcing thread is spirally wound in the opposite direction to the first reinforcing thread, then an unvulcanized outer rubber layer is applied, and then vulcanization is performed. Manufactured by.

Hereinafter, the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a process diagram showing an outline of the method of the present invention, FIG. 2, and FIG. 3. Figures 4, 5 and 6 are respectively
II-II', l1l-11J', I in the figure
V-IV'.

They are v-v' and v+-v+' sectional views.

In the present invention, first, the mandrel 1 is moved to the inner rubber extruder 2.
feed in the direction of the arrow. In the extruder 2, the mandrel 1 is coated with an inner rubber layer 3 having a predetermined thickness.

All conventional rubbers can be used as the inner rubber layer 3, such as NBR, CR, SBR, and EPD.
Examples include M, C8M, epichlorohydrin rubber, etc., but their origins! @ is not particularly restricted. In this way, the hose material sent out from the extrusion orange 2 has a cross-sectional shape as shown in the second M. This material is then passed through a cooling tank 4, for example a water tank, where it is cooled to, for example, below 15°C.

Next, the hose material passes through the first braider 5. Here, the braider disk rotates in one direction, and a plurality of first reinforcing yarns 6, which are usually fed out from the disk, are spirally wound onto the inner rubber layer 3. All conventional reinforcing threads can be used, such as vinylon, nylon, rayon, polyester, etc.
(for example, 300 to 200 denier) or strands (for example, 5 to 40 denier) obtained by cutting these materials to a regular length (for example, 2 to 3 cm), but the type thereof is not particularly limited. The hose material thus passed through the first braider 5 has a cross-sectional shape as shown in FIG.

The material then passes through an adhesive application sheath 77, such as a dipping bath as shown. As the adhesive 8 in the dipping tank, a rubber adhesive is particularly preferable, such as unvulcanized N
An example is BR'il dissolved in 1,1-trichloroethane (viscosity of about 600 cpa), but the present invention is not particularly limited thereto. Further, although dipping is used as the adhesive application means in FIG. 1, other means such as roll application, brush application, or spray application may be used. The hose material thus passed through the adhesive application zone 7 has a cross-sectional shape as shown in FIG. That is, the first
The reinforcing yarn 6 is embedded in the adhesive 8. The material then passes through a second braider 9. Here, the braider disc rotates in the opposite direction to that of the first braider 5, and usually a plurality of second reinforcing threads 10, which are fed out from the disc, are spirally wound from above the layer of adhesive 8. It is wrapped in a shape. This reinforcing thread 10 is also the same as the first reinforcing thread described above. The hose material thus passed through the second braider 9 has a cross-sectional shape as shown in FIG. In other words, the second spiral reinforcing thread is embedded in the adhesive 8. This completes the formation of the reinforcing yarn layer.

The material is then fed to an outer rubber extruder 11.

Here, the reinforcing thread layer is covered with an outer rubber layer 12 of a predetermined thickness. As with the inner rubber layer 3, all conventionally used rubber layers can be used for the outer rubber layer 12, such as CR,
Examples include EPDM and C8M.

In this way, the hose material sent out from the extruder 11 is
It has a cross-sectional shape as shown in the figure. This material is then transferred to the cooling tank 13.
For example, it can be passed through an aquarium.

The material is then wound onto a drum and subjected to vulcanization.

Vulcanization is carried out in the same manner as in conventional methods, for example 140-1
It is carried out for 30-60 minutes at 70°C. Finally, mandrel drawing is performed in the same manner as in the conventional method, and the desired length is cut to obtain the desired rubber hose containing reinforcing thread.

In the reinforced pre-filled rubber hose according to the present invention as described above, even if the first reinforcing layer and the second reinforcing thread are slippery, they will not slip because their arrangement is fixed by the adhesive layer. Therefore, there is no misalignment between the inner rubber layer and the outer rubber layer in the reinforcing thread layer. In addition, according to the method for manufacturing a rubber hose containing reinforcing thread according to the present invention, since the second spiral reinforcing thread is sunk into one adhesive layer and wound, the arrangement thereof will not be disordered in subsequent steps, especially when applying the outer rubber layer. never be done.

[Brief explanation of drawings]

Figure 1 is a schematic process diagram of the method of the present invention, Figures 2 and 3 are
Figures 4, 5 and 6 are gi diagrams n-n', tn-m', ■-■', v-v' and Vl, respectively.
It is a '-Vl' sectional view. 1... Mandrel, 2... Inner 8th round fM, 3
... Inner comb layer 8, 4... Cooling tank, 5... First breaker 16... First reinforcing thread, 7... Adhesive application zone, 8... Before bonding 11. 9... Second brake, -der, 10... Second ram 9 strong thread, 11... Outer rubber extruder, 12... Outer comb layer, 13... Cooling tank.

Claims (1)

[Scope of Claims] <1) In a rubber hose in which a reinforcing thread layer is formed on the outer surface of an inner rubber layer of the inner wall and an outer rubber layer is formed thereon, the reinforcing thread layer is arranged in a spiral shape on the inner rubber layer. a first 'tili strong thread wound around the strand, an adhesive layer applied thereon, and a second reinforcing thread spirally wound in the opposite direction to the first reinforcing thread above the first reinforcing thread; A reinforced pre-filled rubber hose characterized by comprising: (2) The first reinforcing thread is spirally wound around the outer surface of the unvulcanized hollow inner rubber layer, an adhesive is applied thereon, and then the second reinforcing thread is wrapped around the outer surface of the unvulcanized hollow inner rubber layer. A method for manufacturing a rubber hose containing reinforcing thread, which is characterized in that the reinforcing thread is wound spirally in the opposite direction to the reinforcing thread, then an unvulcanized outer rubber layer is applied, and then vulcanization is performed.