JPS6256687A - Hose - 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] [Technical Field of the Invention] The present invention relates to an improvement in a hose using glass fiber as a braided reinforcing layer, and more specifically, to improve a hose that uses glass fiber as a braided reinforcing layer, and more specifically, to improve the hose so that even if the glass fiber breaks, it will not cause problems in yarn processing. The present invention provides a hose in which a braided reinforcing layer is formed of a composite fiber of glass fiber and bend-resistant fiber.

[Conventional technology]

A rubber tube is used for the inner layer, fibers are braided on the surface to form a braided reinforcing layer, and if necessary, a braided reinforcing layer is formed on top of that, and a rubber layer or synthetic resin layer is covered as the surface layer. Hose is known.

On the other hand, many rubber hoses are used around vehicle engines and agricultural machinery engines, and rubber hoses used for this purpose are required to have pressure resistance, oil resistance, and heat resistance.

In the case of rubber hoses used at normal temperatures, synthetic fibers or natural fibers are used as the fibers constituting the braided reinforcing layer. However, as mentioned above, in the case of rubber hoses that require particularly high heat resistance, methods of using glass fibers are being considered.

Glass fiber is highly elastic, has excellent properties such as heat resistance and corrosion resistance, and is excellent in that it can be made homogeneous, so it is suitable as a reinforcing material constituting the braided reinforcing layer.

However, on the other hand, this glass fiber is extremely brittle, and it is especially difficult to use it by simply pulling out the glass fiber that has been wound around a bobbin using a loose traverse, such as when reinforcing synthetic resin molded products using the filament winding method. There are no problems with cutting etc.

However, when this glass fiber is used as a reinforcing material for hoses, it inevitably goes through a process of braiding it onto a rubber tube, which causes the glass fiber to break and breakage, and the handling of the yarn becomes difficult. This will cause the above problem.

Glass fiber is usually produced and used in the form of a multifilament B (i.e., an aggregate of single fibers: called a yarn), but when some of the fibers in the yarn break, they become fuzz; This fuzz progresses and eventually the entire yarn is cut.

Moreover, even in the state of yarn, the bending operation causes the yarn to be simply cut at the joints.

As mentioned above, glass fiber is extremely brittle and easily cut, making it difficult to handle.
There is a problem in that cut threads cannot be connected.

On the other hand, in the braiding process for the reinforcing layers of rubber hoses, a large number of glass fiber threads are used at the same time, but if some of the threads break, an uneven braiding process is required to deal with the breakage. This results in confusion and a decrease in standard size yield. In addition, fluff protrudes from the braided reinforcing layer and reduces adhesion with rubber, further reducing the dimensional accuracy of the hose.
There is a problem in that the quality of the rubber hose is deteriorated, such as by a reduction in reinforcement efficiency.

[Purpose of the invention]

The present invention solves the problems such as cutting and fluffing when braiding glass fiber threads as described above, can be used in the braiding process in the same way as ordinary fiber threads, and has the characteristics of glass fibers. The present invention provides a hose having a braided reinforcing layer that takes advantage of the

[Summary of the invention]

To achieve the above object, the present invention is a hose in which a braided reinforcing layer is provided on the surface of a rubber tube, characterized in that the braided reinforcing layer is formed of a composite fiber of glass fiber and a fiber with bending resistance. It is a hose that can be used.

The glass fiber referred to in the present invention is 50 to 600 tex (
The main subject is leprosy.

As the bend-resistant fiber (reinforcing fiber) for reinforcing the glass fiber or glass fiber yarn as a composite fiber, synthetic fiber yarn is usually most suitable. Synthetic fibers include nylon, polyester, vinylon, and aramid fibers.

Carbon fiber can be used in some cases, but carbon fiber has high elasticity and high heat resistance, but like glass fiber, it is brittle, so it is best to soften it with a rubber adhesive. good.

The threads, which are aggregates of glass fibers (multifilaments), are reinforced by being composited with fibers or threads that have better flexibility than the glass fibers, but the following method is used to manufacture this composite fiber. be.

■ A method of twisting single yarns of glass fiber and reinforcing fiber together. This method creates a rope-like structure by twisting two threads together.

■ A method in which reinforcing fiber threads are spirally wound around an aggregate of glass fibers to completely coat the glass fibers.

In the method described above, the glass fiber thread is almost linear, and the reinforcing fibers are wound around the surface of the glass fiber thread.

■ A method of wrapping expanded multifilament reinforcing fibers around glass fiber threads.

In this method, a structure is obtained in which a sheet of reinforcing fiber wraps a glass fiber thread.

■ A method in which glass fibers and reinforcing fibers are aligned and used in this state without heating.

This method results in a structure in which two fiber threads are arranged in parallel.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings.

Figure 1 is a front view showing a part of the rubber hose in section;
The figure is a side view.

In the rubber hose H, an adhesive N2 is formed on the surface of an inner rubber layer (rubber tube) 1, and a braided reinforcing layer 3 is further formed via this adhesive layer 2.

In this example, the inner layer rubber N1 has an inner diameter of 7.5
An oil-resistant rubber tube with an outer diameter of 12.0 mm was used.

Adhesive layer 2 is made of vinylidene chloride-based adhesive MEK (
The solution was diluted with methyl ethylene ketone) to make a 10% solution, which was applied onto the inner rubber layer 1 by dipping, and then the braided reinforcing layer 3 was provided.

The braided reinforcing layer 3 was obtained by braiding fibers, applying a vinylidene chloride adhesive to the braided reinforcing layer, and naturally drying the layer at 20° C. for 10 hours.

Glass fiber constituting the braided reinforcing layer 3 (150'83.8
5) G is one multifilament, and one polyester multifilament of 1,500 denier and 190 filaments was aligned as a reinforcing fiber R to this multifilament and used as a composite structure fiber.

To align the glass fibers G and the polyester fibers constituting the reinforcing fibers R, prepare a bobbin for each fiber, pull out the fibers from both bobbins, let them pass through a guide member having a guide hole, and then align them. It was wound on a bobbin as one piece.

(A slightly modified method of manufacturing the composite fiber in item (1) above was applied.) In the process of manufacturing the glass fiber with this composite structure, the glass fiber G and the reinforcing fiber R such as polyester fiber were each lightly twisted. Alternatively, it is possible to use only the reinforcing fiber R with a light twist. In this case, handling of the fibers becomes extremely easy.

In the present invention, the glass fiber threads or the reinforcing fibers that reinforce the glass fibers are inferior in heat resistance and flame resistance to glass fibers, so it is preferable that the amount thereof be as small as possible while still achieving the purpose of the present invention. .

Although it differs depending on the degree to which glass fiber is expected to be used in abnormal situations (fire, etc.), for example, a material having a volume ratio of about 30 to 70% glass fiber is used.

〔Effect of the invention〕

The hose according to the present invention is provided with a braided reinforcing layer as a means for reinforcing the inner rubber layer, and glass fiber yarn is used as the fiber constituting the braided reinforcing layer. It is characterized by having a composite structure of fibers with reinforcing fibers, such as fibers and natural fibers, which are more flexible than glass fibers, and by braiding these fibers.

According to the present invention, the following effects can be achieved compared to the case where glass fiber yarn is used alone.

(1) It is possible to prevent thread breakage when braiding glass fibers onto the inner rubber layer.

(2) Connecting glass fiber threads in the braiding process can be simplified.

(3) Conventionally, thread breakage occurred at the tightening part of the metal fitting, but in the present invention, the glass fibers are reinforced with bend-resistant fibers, so thread breakage can be prevented.

(4) Since the glass fiber threads are formed into a composite structure, the bending fatigue resistance of the braided reinforcing layer can be improved.

(5) Since the hem reinforcing layer is mainly composed of glass fiber threads, it has heat resistance and flame resistance.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a front view with a part of the hose cut away, and FIG. 2 is a side view of the same. H...Hose, G...Glass fiber thread, R...Reinforcing fiber thread, 1...Inner surface rubber layer, 2...Adhesive layer,
3... Braided reinforcement layer (external reinforcement N).

Claims (1)

[Claims] 1. A hose having a braided reinforcing layer provided on the surface of a rubber tube, characterized in that the braided reinforcing layer is made of a composite fiber of glass fiber and bend-resistant fiber.