JPH0919973A - Fiber reinforced hose and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose a lightweight and inexpensive fiber reinforced hose in which reinforcing fibers do not come off from the end parts clamped with a coupler during the use with both end parts connected with the coupler at prescribed positions. SOLUTION: In both end parts 3, 3 of a fiber reinforced hose composed of an inner layer tube 1a, an outer layer tube 1b, and reinforcing fibers 2a located between the layers 1a, 1b, the reinforcing fibers 2a, the inner layer tube 1a, and the outer layer tube 1b are bonded with an adhesive 4 respectively, and reinforced end parts 3', 3' are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial, commercial, household threaded hose applicable to any fluid such as liquid or gas, and a method for producing the hose.

[0002]

2. Description of the Related Art A hose containing a reinforcing thread is conventionally known.
The structure is generally made by interposing a reinforcing layer made of a reinforcing thread between the inner tube and the outer tube, and a typical example is one in which a reinforcing layer made by braiding synthetic resin reinforcing threads is interposed. is there.

[0003]

However, in this type of hose containing a reinforcing thread, both ends a of the hose A are attached to a coupler nipple B, for example, by a coupler, as shown in FIG. , The inner and outer layer tubes a ₁ and a ₂ of the hose A are stretched due to the internal pressure and the tensile force applied to the hose A during its use when connected by being tightened by the coupler nut C. R reinforcing thread r
Is displaced, and finally does not exist at the end portion a tightened by the joint of the hose A, and as a result, the strength such as the withstand pressure of the end portion a where the reinforcing thread r is lost sharply decreases. However, accidents such as bursting or detaching from the joint often occurred. D shows the trace of the thread coming off. Such phenomena result of examining the cause of occurs, reinforcing yarn r of the internal and external layer tube a _1, a ₂ and tensile strength are differences simply interposed between the outer layer tube a ₁ and the inner layer tube a ₂ Since the inner and outer layer tubes a ₁ and a _{2 of the} hose A are stretched during use, it is considered that the reinforcing thread r interposed therebetween is displaced. Therefore, in order to prevent this, as a hose with a thread, in the extrusion molding, when interposing a reinforcing thread in the inner and outer layer tubes, an adhesive is applied over the entire length of the hose to integrally bond the three parts over the entire length. However, in manufacturing such a hose with thread, not only is the work of applying the adhesive over the entire length extremely troublesome, but also expensive equipment is required, and the consumption of the adhesive increases. However, there are drawbacks that the manufacturing cost is significantly increased and the weight is increased. Therefore, the reinforcing yarn r at the end portion a tightened by the joint of the hose A does not shift in position, maintains a large pressure resistance for a long period of time, and manufactures a stable and reliable yarn-containing hose at low cost and with high efficiency. Development that can be done is desired.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a threaded hose satisfying the above-mentioned needs and having improved mechanical strength at the ends, which comprises an inner layer tube and an outer layer tube. Reinforcing both ends of a hose containing a reinforcing thread with a reinforcing layer of a reinforcing thread interposed between the reinforcing thread forming the reinforcing layer and the inner layer tube and the outer layer tube with an adhesive agent Configured at the end.

Further, the present invention provides a method for producing a yarn-containing hose capable of easily and inexpensively producing the above-mentioned yarn-containing hose of the present invention. A reinforcing layer made of a reinforcing yarn is provided between the inner layer tube and the outer layer tube. Each of the two ends of the interposing hose containing a reinforcing thread is dipped in an adhesive solution, and the adhesive solution is impregnated in the gap between the reinforcing thread and the inner and outer tube layers, and then dried and solidified. And

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a threaded hose according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view in which a part of its reinforcing end is cut away. In the drawings, reference numeral 1 indicates a threaded hose cut into a predetermined length. The thread-containing hose 1 includes a synthetic resin inner layer tube 1a and a synthetic resin outer layer tube 1
b and a reinforcing layer 2 made of a synthetic resin reinforcing thread 2a interposed therebetween. The thread-containing hose 1 having the above structure
Is the same as the conventional threaded hose 1 and is manufactured according to the conventional known manufacturing method. In the illustrated example, the reinforcing layer 2 is formed of a so-called blade cylinder body in which a large number of reinforcing yarns 2a are braided by a known braiding means.
The reinforcing layer 2 may be formed by winding a on the inner tube 1a in a coil shape, and the reinforcing thread 2a may be used to form the reinforcing layer 2. In addition, the inner and outer layer tubes 1a and 1b
The synthetic resin which is the molding material is preferably a polyurethane resin, a thermoplastic resin such as a soft polyvinyl chloride resin, a thermoplastic elastomer such as a styrene elastomer and an olefin elastomer, but is not limited thereto. Reinforcing thread 2
As a, tough synthetic fiber yarns such as polyester yarns and nylon yarns are preferable, but not limited thereto.

According to the present invention, the reinforcing yarn 2a and each of the inner layer tube 1a and the outer layer tube 1b are bonded to each other with the adhesive 4 only at both ends 3 and 3 of the thread-containing hose 1 having such a structure. The reinforcing end portions 3 ', 3'are characterized. In FIG. 2, both reinforcing end portions 3 ′ containing the adhesive 4 which is an essential part of the threaded hose 1 of the present invention,
Although an enlarged plan view is shown in which a part of one reinforcing end 3'of 3'is cut away, the other reinforcing end 3'has the same characteristic configuration.

In this way, both ends 3 and 3 of the threaded hose
In addition, a threaded hose having reinforcing ends 3 and 3 formed by integrally binding the inner and outer tubes 1a and 1b and the reinforcing thread 2a interposed therebetween by an adhesive 4
It is lighter in weight than a hose with a thread containing an adhesive over its entire length, and can be obtained simply, economically and highly efficiently by the above manufacturing method.

[0009]

EXAMPLES Next, examples of the manufacturing method will be described.
Inner layer tube made of polyurethane resin (JIS
Hardness HSA 75) based on K 7331 is molded, and a 630 denier nylon reinforcing thread is formed on the peripheral surface of the tubular mesh body by a braiding machine, and an outer layer tube (hardness HSA 75) is molded using polyurethane resin as a material. Then, the thread-containing hose S was continuously manufactured by extrusion molding. The dimensions were 6.5 mm inside diameter and 10.5 mm outside diameter. A large number of hoses S cut into, for example, 30 m suitable for use were prepared. As shown in FIG. 3, each of these hoses S was immersed in an adhesive solution prepared by appropriately dissolving water or an organic solvent for a predetermined length of one end 3 thereof. For example, as the adhesive liquid 4a in the processing tank 5, for example, an adhesive liquid prepared by dissolving a polyurethane-based adhesive (solid content 10%) in a MEK solution is prepared. Immerse one end part 3 for 5 minutes, 10 minutes,
It was immersed for 30 minutes. During this immersion, the adhesive liquid
From the lower end surface of each hose S, it was permeated and impregnated into the gap between the reinforcing yarn 2a and the inner and outer layer tubes 1a and 1b by a capillary phenomenon. Thus, depending on its soaking time,
Respective hose impregnated with the adhesive liquid from the end face with lengths of 5 mm, 10 mm, and 50 mm were obtained. By pulling up and leaving each hose after the dipping treatment, the hose S
The adhesive liquid impregnated inside was naturally dried or solidified by appropriate heat drying to obtain a reinforcing end portion 3'in which the reinforcing yarn 2a and the inner and outer layer tubes 1a and 1b are integrally bonded. . At the end 3 of each hose, 5m from the end face
Reinforced ends 3'containing adhesives of m, 20 mm and 50 mm were obtained respectively. Similarly, the other end 3 of each hose S was also impregnated with an adhesive, dried, and solidified to form respective reinforced ends 3 ', and thus the threaded hoses 1 of the present invention were manufactured.

[0010] Three types of threaded hose products 1, 2 and 3 of the present invention having different lengths of the reinforcing end portions 3'obtained by the above-mentioned production and a conventional threaded hose before being impregnated with an adhesive are used. As a control product S, a burst test and a joint pull-out test specified in JIS K 6330 were performed. In the joint pull-out test, both ends of the hose are attached to a nut coupler 20SN / PN hose joint manufactured by Nitto Kohki Co., Ltd. The tensile strength at the time of pulling out was measured. The test results are shown in Table 1 below.

[0011]

[Table 1]

As is clear from Table 1 above, the threaded hose-implemented products 1, 2, and 3 of the present invention have a higher burst pressure and a higher burst pressure than the control product S, that is, the conventional threaded hose having no adhesive on both ends. It was confirmed that the drawing strength was significantly improved.
Incidentally, according to the manufacturing method of the present invention, the immersion time of the adhesive solution is 5
Burst pressure and pull-out strength are hardly improved even if immersed for more than a minute, and the immersion depth from the end face of the hose is sufficient if the length that can be tightened with a joint is 5 to 5 mm from the end face.
Generally, the length is about 50 mm, and therefore the reinforcing end 3 ″ is 5 mm.
It is generally about mm to 50 mm.

Thus, a joint in which both the reinforcing end portions 3 ', 3'of the hoses of the above-described products 1, 2, 3 of the present invention are actually attached to desired pipe end portions as shown in FIG. Although it was used for a long time in the state of being tightened with, the conventional reference product S had positional deviation of the yarn from the joint portion and yarn loss. However, both hoses of the products 1, 2 and 3 of the present invention were reinforced. When the end portions 3'and 3'were inspected, there was no positional deviation of the reinforcing yarn 2a, and it was possible to maintain extremely large pressure resistance by tightening.

Needless to say, the threaded hose of the present invention is not limited to the synthetic resin hose described above, but is applied to a rubber threaded hose.

[0015]

As described above, in the thread-containing hose of the present invention, the reinforcing thread and the inner and outer layer tubes are integrally bonded with the adhesive only at the both ends of the hose. When tightened with a joint and used for a long time,
It provides a stable, robust, highly reliable, reasonably inexpensive, and relatively lightweight threaded hose with no displacement of the reinforcing thread. Also,
The threaded hose of the present invention can be obtained with a high efficiency by a simple operation in which both ends are simply immersed in the adhesive liquid for a short time after the production of an ordinary threaded hose and the consumption of the adhesive is small. Have an effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a threaded hose of the present invention with a part thereof cut away.

FIG. 2 is an enlarged view in which a part of a reinforcing end portion of the thread-containing hose shown in FIG. 1 is cut off.

FIG. 3 is a diagram showing an example of the implementation of the method for producing a threaded hose of the present invention.

FIG. 4 is a view for explaining a state where the reinforcing yarn is displaced at the end portion in a state where the conventional threaded hose is used by being connected with a joint.

[Explanation of symbols]

1 Hose with thread of the present invention 1a Inner layer tube 1b Outer layer tube 2 Reinforcing layer 2
a Reinforcing thread 3 End 3'Reinforcing end 4
Adhesive 4a Adhesive liquid

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B29L 9:00

Claims (3)

[Claims] 1. A hose having a reinforcing thread formed by interposing a reinforcing layer made of a reinforcing thread between the inner layer tube and the outer layer tube, and the reinforcing thread constituting the reinforcing layer, the inner layer tube, and the outer layer. A hose with a thread formed by connecting each of the tubes with an adhesive to form a reinforced end. 2. The length of the reinforcing end portion is 5 mm to 50 mm.
The threaded hose according to claim 1, which is 3. A hose containing a reinforcing thread formed by interposing a reinforcing layer made of a reinforcing thread between the inner layer tube and the outer layer tube is immersed in an adhesive solution to form the reinforcing thread and its inner and outer tube layers. A method for producing a threaded hose, which comprises impregnating an adhesive liquid in a gap between the two and then drying and solidifying the same to form a reinforcing end.