JPH11309786A - Manufacture of hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an adhesive and a heating process unnecessary by a method wherein a thermoplastic resin or thermoplastic elastomer, the melt viscosity just after an extrusion of which is set to be a specified value, is extruded annually so as to form an inner tube layer and a reinforcing thread layer on the outer periphery of the inner tube layer and further an outer tube layer on the outer periphery of the reinforcing thread layer. SOLUTION: By extruding a resinous material from an inner tube extruder 20, an inner tube is formed. At the same time, by delivering reinforcing threads from a spiral device 50, a spiral net is assembled on the outer periphery of the an inner tube layer. At the same time, by extruding a resinous material from an outer tube extruder 30 so as to cover the reinforcing threads, an outer tube is formed. A hose H is extruded downwards from the inner tube extruder 20 so as to be immersed in the cooling medium in a cooling tank 81 in order to be cooled and solidified. Further, as a material, of which the inner layer is made, a thermoplastic resin or a thermoplastic elastomer is used under the condition that the melt viscosity just after the extrusion of the material is set to be 10<4> -10<6> poise. Furthermore, a material of which the outer tube layer is made, is set to be the same as that, of which the inner tube layer is made or a rubber material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a resin hose in which a reinforcing yarn is braided.

[0002]

2. Description of the Related Art Conventionally, a hose shown in FIG. 7 is known as this kind of hose. FIG. 7 shows a conventional resin hose H.
It is explanatory drawing which shows the process of manufacturing. Hose manufacturing equipment 1
00 is an inner tube extruder 102 and a spiral device 104
And an adhesive application device 106 and an outer tube extruder 108, which are arranged in parallel. In order to manufacture the hose H using the hose manufacturing apparatus 100, first, the inner tube layer A is extruded from the inner tube extruder 102, and a reinforcing yarn is formed on the outer periphery of the extruded inner tube layer A by the spiral device 104. The reinforcing layer B is formed by helically braiding F. At this time, the adhesive is applied to the reinforcing yarn F by the adhesive application device 106. Thereafter, the outer tube layer C is formed by the outer tube extruder 108 so as to cover the reinforcing yarn F, and thereby the hose H is manufactured.

As another conventional technique, instead of using an adhesive, the surface of the inner tube layer A is heated and melted immediately before coating the outer tube layer C, and the reinforcing yarn F and the outer tube layer C are used. There is also known a method of facilitating adhesion with the adhesive.

[0004]

However, in the former conventional technique, it is difficult to select an adhesive for obtaining a large adhesive strength in bonding the reinforcing yarn F, the inner tube layer A and the outer tube layer C. was there.

Further, in the latter conventional technique, if the heating amount is too large, the inner tube layer A is melted too much, and if it is too small, the original function of facilitating adhesion cannot be obtained. There is a problem that it is difficult to control the process to control the degree of the process.

An object of the present invention is to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a method of manufacturing a hose which does not require an adhesive or a heating step.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. According to the present invention, there is provided a method of manufacturing a hose having a braided reinforcing yarn, comprising a step of forming a thermoplastic resin or a thermoplastic elastomer into an annular shape. An inner tube layer forming step of forming an inner tube layer by extruding the inner tube layer, a reinforcing layer forming step of forming a reinforcing yarn layer by braiding reinforcing yarn on the outer periphery of the inner tube layer, An outer tube layer forming step of forming an outer tube layer by extruding any of a molten thermoplastic resin, a thermoplastic elastomer or rubber on the outer periphery, and forming a molten thermoplastic resin for forming the inner tube layer. The melt viscosity immediately after the extrusion of the resin or the thermoplastic elastomer is set to 10 ⁴ to 10 ⁶ poise. Here, the melt viscosity is represented by [(shear stress) / (shear rate)] × 9.8 × 10 ⁵ , and the melt viscosity immediately after extrusion generally means that the above-mentioned shear rate is 1 to 1
It means the viscosity in the low shear region at 0 [sec ^-1 ].

In the method of manufacturing a hose according to the present invention, a hose having a braided reinforcing yarn is manufactured through an inner tube layer forming step, a reinforcing layer forming step, and an outer tube layer forming step. That is, in the inner pipe layer forming step, an inner pipe layer is formed by extruding a thermoplastic resin or a thermoplastic elastomer in a ring shape, and then, in a reinforcing layer forming step, a reinforcing yarn is meshed around the outer circumference of the inner pipe layer. The reinforcing yarn layer is formed by assembling. Then, in the outer tube layer forming step, on the outer periphery of the reinforcing yarn layer,
The outer tube layer is formed by extruding either thermoplastic resin, thermoplastic elastomer or rubber, thereby producing a hose. In such a manufacturing process,
Since the melt viscosity immediately after the extrusion of the thermoplastic resin and the thermoplastic elastomer forming the inner tube layer is set to a value of 10 ⁴ to 10 ⁶ poise, a reinforcing yarn is provided on the outer periphery of the extruded inner tube layer. Even when the mesh is braided, the reinforcing yarn is not buried deep in the inner tube layer, and the reinforcing layer can be formed at a desired position near the boundary between the inner tube layer and the outer tube layer. Means for adjusting the melt viscosity of a thermoplastic resin or the like can be realized by increasing the molecular weight, increasing the degree of copolymerization, or blending rubber or the like.

In a preferred embodiment of the present invention, when the hose immediately after being extruded does not have sufficient hardness, in the cooling step following the outer tube layer forming step, the hose is cooled and hardened with a cooling medium, The step of pushing the hose in a substantially vertical and downward direction is added. According to this aspect, the hose immediately after extrusion does not deform flat by its own weight, and does not hinder the operation of winding and storing the hose.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the present invention will be described below.

The hose according to the present embodiment is used as a relatively low-pressure water / air system hose or tap water hose for automobiles such as a sunroof drain hose. FIG. 1 is a cross-sectional view of a hose H according to an embodiment of the present invention, with a part cut away. As shown in FIG.
A reinforcing layer B having reinforcing fibers F1 and F2 spirally braided in opposite directions on the inner tube layer A formed of a resin material or a thermoplastic elastomer; And an outer tube layer C laminated so as to cover the layer B. In the hose H, the fluid flows through the passages in the inner tube layer A, the outer tube layer C secures weather resistance and mechanical strength, and the reinforcing layer B enhances the strength of the hose H itself.

The hose H is manufactured by a hose manufacturing apparatus 10 shown in FIGS. In FIG. 2, a hose manufacturing apparatus 10 is an apparatus for extruding a hose H downward, and an inner pipe extruder 20 arranged vertically.
An outer tube extruder 30 horizontally disposed on the outlet side of the inner tube extruder 20, an inner tube extruder 20 and an outer tube extruder 30.
, A cooling device 80 disposed below the inner tube extruder 20, and a roller device 90 for winding the hose H. Inner tube extruder 20
And since the temperature of the resin material extruded is 180-200 degreeC, the outer tube extruder 30 is comprised so that it may have the heat resistance which can withstand this temperature.

Using the hose manufacturing apparatus 10 described above, the hose H
An outline of the process for producing is described below. First, the inner pipe extruder 2
While forming the inner tube layer A by extruding the resin material from 0, the reinforcing yarns F1 and F2 are fed out from the spiral device 50 and are spirally braided on the outer periphery of the inner tube layer A.
At the same time, by extruding the resin material from the outer tube extruder 30 so as to cover the reinforcing yarns F1 and F2, the outer tube layer C is extruded.
To form As a result, the hose H is extruded downward from the inner tube extruder 20. Then, the extruded hose H is immersed in a cooling medium in a cooling tank 81 of the cooling device 80 to be cooled and solidified, and then wound up by the roller device 90.

Next, the configuration of each part of the hose manufacturing apparatus 10 will be described in detail. FIG. 3 is a cross-sectional view illustrating a main part of the hose manufacturing apparatus 10. As shown in FIG. 3, the inner tube extruder 20 includes an extrusion barrel 22 having a filling chamber 21 filled with a resin material, and a screw 23 disposed in the filling chamber 21.
And an extrusion head 2 fixed to one end of the extrusion barrel 22.
4, an inner tube die 25 fixed to the inside opening of the extrusion head 24, and a torpedo 26 mounted inside the extrusion head 24.

The tip of the inner tube die 25 is sharpened in a conical shape and has an opening 25a at the tip. The one end of the main body 26a of the torpedo 26 penetrates through the opening 25a, thereby forming a resin material. Is formed. The torpedo 26 has a main body 26a.
The inner tube die 25 is fixed to the inner wall of the inner tube die 25 by a fixing portion 26b protruding laterally from the inner tube die 25. In the torpedo 26, a portion protruding from the opening 25a is formed short so that heat transmitted to the molten resin extruded from the orifice 27 is reduced and the molten resin is easily cooled.

Further, as shown in FIG.
Is arranged on the side of the inner tube die 25 side of the inner tube extruder 20 and extrudes the resin material forming the outer tube layer C onto the inner tube layer A. The outer tube extruder 30 includes an extrusion head 32 having a filling chamber 31 filled with a resin material. At the lower end of the extrusion head 32, an intermediate die 41 is fixed by a die holder 41a. Reference numeral 42 is fixed by a die holder 42a, and the intermediate die 41 and the outer tube die 42 form a material outlet 33 therebetween.

Returning to FIG. 2, the spiral device 50 is a mechanism for paying out the reinforcing yarns F1 and F2 onto the inner tube layer A (FIG. 1), and includes an inner bobbin carrier 60 and an outer bobbin carrier 70. I have. The inner bobbin carrier 60 is a mechanism connected to the drum D1 to feed out the reinforcing thread F1 from the inside, and the outer bobbin carrier 70 is connected to the drum D2 to feed out the reinforcing thread F2 from the outside of the inner bobbin carrier 60. These rotate in opposite directions in synchronization with each other about the axis of the inner tube extruder 20.

FIG. 5 is a view showing the vicinity of the inner bobbin carrier 60. The inner bobbin carrier 60 includes an inner support plate 61 connected to the drum D1 (FIG. 2), an inner bobbin 62 fixed to one outer peripheral surface of the inner support plate 61, and an inner support plate 61.
A drive arm 63a which is fixed upright on the shaft, a shaft 63b and a spinner arm 63 at the end of the drive arm 63a.
and an inner spinner 64 fixed via the c.
The inner spinner 64 has a conical shape arranged at a predetermined interval on the outer periphery of the inner tube die 25, and is rotatably supported by a bearing 65. With the configuration of the inner bobbin carrier 60, when the drum D1 rotates, the inner spinner 64 rotates through the inner support plate 61, the drive arm 63a, the shaft 63b, and the spinner arm 63c, and the reinforcing yarn F1 is paid out from the inner bobbin 62. .

On the other hand, as shown in FIG. 6, the outer bobbin carrier 70 is arranged outside the inner bobbin carrier 60 and has the same configuration as the inner bobbin carrier 60. That is, the outer bobbin carrier 70 includes an outer support plate 71 connected to the drum D2 (FIG. 2), an outer bobbin 72, a drive arm 73a, a shaft 73b, and a spinner arm 73c.
And an outer spinner 74, which is configured to rotate in the opposite direction to the inner bobbin carrier 60 by rotating the drum D <b> 2. The end of the outer spinner 74 is rotatably supported by a bearing 75 fixed to the outer wall of the extrusion head 32. This outer bobbin carrier 70
When the drum D2 rotates, the outer bobbin 72
, And the reinforcing yarn F2 is paid out.

In FIG. 2, a cooling device 80 is disposed below the inner tube extruder 20 and has a cooling medium (water).
Is provided. Also, the cooling tank 81
A roller device 90 is disposed inside and on the side thereof. The roller device 90 includes guide rollers 91, 92, and 93 disposed in the cooling tank 81, and a winding roller 94 for winding the hose H.

Next, the hose H by the hose manufacturing apparatus 10
Will be described. Now, when the screw 23 rotates in a state where the resin material is filled in the extrusion barrel 22 of the inner tube extruder 20 shown in FIG.
The resin material is extruded downward from the filling chamber 21 of the extrusion barrel 22 via the orifice 27. Thereby, the inner tube layer A following the shape of the orifice 27 is formed.

Here, as a material for forming the inner tube layer A,
An olefin-based thermoplastic resin (TPO), a styrene-based thermoplastic elastomer (TPS), an amide-based thermoplastic elastomer (TPAE), vinyl chloride (PVC), a polyester-based thermoplastic elastomer (TPEE), or the like can be used. It is necessary that the melt viscosity of the resin material of the inner tube layer A is within a predetermined range, that is, the melt viscosity immediately after extrusion of the resin material or the like is 10 ⁴ to 10 ⁶ poi.
It is preferably se. This is because if the melt viscosity is low, the shape of the hose H is maintained and the reinforcing yarn F
On the other hand, if the melt viscosity is too high, the resistance at the time of extrusion will be too large, which will hinder the extrusion molding. The viscosity of the resin material can be adjusted by increasing its molecular weight, increasing the degree of copolymerization, or blending rubber or the like. The temperature of the molten resin extruded from the inner tube extruder 20 varies depending on the properties of the resin material and the like, but is preferably about 30 ° C. higher than the melting point in consideration of extrudability.

The reinforcing yarn F is applied to the inner tube layer A immediately after being extruded by the inner tube extruder 20 by a spiral device 50.
1, F2 are woven. That is, the spiral device 5
0 while the drum D1 and the drum D2 rotate in opposite directions to each other, the reinforcing yarns F1,
F2 is respectively paid out. When the reinforcing yarn F1 is paid out from the inner bobbin 62, it is led out onto the inner tube layer A through a yarn guide space Gs between the inner spinner 64 and the outer spinner 74.

On the other hand, the reinforcing yarn F2 is also fed out from the outer bobbin 72 through the yarn guide space Gs onto the inner tube layer A. The reinforcing yarns F1 and F2 are unwound onto the inner tube layer A while the inner spinner 64 and the outer spinner 74 of the spiral device 50 rotate in opposite directions, and are braided spirally on the inner tube layer A to form the reinforcing layer B. Is formed. Here, as a material of the reinforcing yarns F1 and F2, heat resistance (250 ° C. or more)
In consideration of yarn strength and polyester, 66 nylon,
Vinylon can be used. Also, the reinforcing yarns F1, F
2 is adjusted in tension so that it is not embedded in the inner tube layer A when it is braided.

Subsequently, the resin material is supplied from the outer tube extruder 30 to the material outlet 3 on the inner tube layer A braided with the reinforcing yarns F1 and F2.
3, the reinforcing yarns F1, F2
Is covered with the outer tube layer C. Here, the outer tube layer C
As the material for forming the above, the same olefin-based thermoplastic resin (TPO) or amide-based thermoplastic elastomer (TPAE) as the inner tube layer A can be applied, or a rubber material may be used. If the outer tube layer C is made of the same material as the inner tube layer A, the joining strength between them can be further increased.

As described above, the inner pipe extruder 20 and the outer pipe extruder 3
When the hose H is pushed downward by the spiral device 50 and the inner tube extruder 20, the hose H is disposed below the inner tube extruder 20 while being guided by the guide rollers 91, 92, 93. It is immersed in the cooling medium in the cooling tank 81, cooled, and immediately hardened. Then, the hose H is wound by the winding roller 94.

In the manufacturing process of the hose H, the resin material of the inner tube layer A and the outer tube layer C is extruded in a molten state from the inner tube extruder 20 and the outer tube extruder 30, respectively, and is cooled almost simultaneously. , Inner tube layer A, outer tube layer C and reinforcing yarn F
A large adhesive force can be obtained between F1 and F2. Moreover, as described in the related art, the reinforcing yarns F1, F2
Does not require an adhesive to join the inner tube layer A and the outer tube layer C, the flexibility of the hose H can be increased, and the surface of the inner tube layer A needs to be reheated. Since there is no such process, the manufacturing process can be simplified.

In the above hose H, when the viscosity of the resin material of the inner tube layer A is set to a value close to rubber of 10 ⁴ to 10 ⁶ poise, and the reinforcing yarns F1 and F2 are braided into the inner tube layer A, By setting the tension at a low value, even if the reinforcing yarns F1 and F2 are braided around the outer periphery of the inner tube layer A immediately after being extruded from the inner tube extruder 20, the reinforcing yarns F1 and F2 remain in the inner tube layer A. The reinforcing layer B can be formed at a desired position near the boundary between the inner tube layer A and the outer tube layer C without being buried deep in the inner layer.

Further, the hose H immediately after being extruded from the inner tube extruder 20 is still soft, but is extruded in the vertical direction by the inner tube extruder 20, so that it does not deform flat due to its own weight. In addition, since the hose H is cooled and hardened by the cooling device 80 after being extruded, the hose H is not deformed even when wound by the winding roller 94.

The present invention is not limited to the above embodiment, but can be implemented in various modes without departing from the gist of the present invention. For example, the following modifications are possible.

(1) As another embodiment, a reinforcing yarn F
1 and F2 are, for example, reinforcing yarns F1 and F2 as means for increasing the adhesive force between the inner tube layer A and the outer tube layer C.
May be coated with the same material as the inner tube layer A or the outer tube layer C or a material having excellent adhesion.

(2) The material of the outer tube may be formed of a thermoplastic resin or a thermoplastic elastomer, or may be formed of rubber or the like in order to increase its use and flexibility. The material is not particularly limited.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view of a hose H according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a hose manufacturing apparatus 10.

FIG. 3 is a sectional view showing the vicinity of an inner tube extruder 20 of the hose manufacturing apparatus 10.

FIG. 4 is a sectional view showing a main part of FIG. 3;

FIG. 5 is an explanatory view showing the vicinity of an inner bobbin carrier 60.

FIG. 6 is an explanatory view showing the vicinity of an outer bobbin carrier 70.

FIG. 7 is an explanatory view illustrating a process of manufacturing a conventional resin hose H.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Hose manufacturing apparatus 20 ... Inner pipe extruder 21 ... Filling chamber 22 ... Extrusion barrel 23 ... Screw 24 ... Extrusion head 25 ... Inner pipe die 25a ... Opening 26 ... Torpedo 26a ... Body part 26b ... Fixed part 27 ... Orifice 30 ... Outer tube extruder 31 Filling chamber 32 Extrusion head 33 Material outlet 41 Intermediate die 41a Die holder 42 Outer tube die 42a Die holder 50 Spiral device 60 Inner bobbin carrier 61 Inner support plate 62 Inner bobbin 63a Drive arm 63b Shaft 63c Spinner arm 64 Inner spinner 65 Bearing 70 Outer bobbin carrier 71 Outer support plate 72 Outer bobbin 73a Drive arm 73b Shaft 73c Spinner arm 74 Outer spinner 75 ... Bearing 80 ... Cooling device 81 ... Cooling tank 90 ... Roller device 91,92, 93: guide roller 94: winding roller H: hose A: inner tube layer B: reinforcing layer C: outer tube layer F1, F2: reinforcing thread D1, D2: drum Gs: thread guide space

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29K 101: 12 105: 08 B29L 9:00 23:00

Claims (3)

[Claims] 1. A method for producing a hose having a braided reinforcing yarn, comprising: forming an inner tube layer by extruding a thermoplastic resin or a thermoplastic elastomer in a ring shape; A reinforcing layer forming step of forming a reinforcing yarn layer by braiding reinforcing yarn around the outer periphery, and extruding any of a molten thermoplastic resin, thermoplastic elastomer or rubber to the outer periphery of the reinforcing yarn layer to form an outer layer. An outer tube layer forming step of forming a tube layer, wherein the melt viscosity immediately after extrusion of the molten thermoplastic resin or thermoplastic elastomer for forming the inner tube layer is 10
^A method for manufacturing a hose, wherein the hose is set at ⁴ to 10 ⁶ poise. 2. The method for manufacturing a hose according to claim 1, further comprising a cooling step of cooling the hose immediately after being extruded through the outer tube layer forming step with a cooling medium, following the outer tube layer forming step. 3. The hose according to claim 1, wherein the inner tube layer forming step and the outer tube layer forming step are steps of guiding the inner tube layer and the hose in a substantially vertical direction and downward. Production method.