JP5384847B2 - Hose and method of manufacturing hose - Google Patents

Description

  The present invention relates to a hose that can be suitably used for, for example, a toilet, a kitchen, a wash basin, a faucet fitting for a bathroom, a pipe for water supply, and a pipe for water supply and hot water supply.

  Conventionally, metal pipes mainly made of copper, stainless steel or the like have been used for piping for hot and cold water supply. However, since metal pipes are hard and inferior in flexibility, there is a problem that handling properties and workability are poor. Therefore, recently, instead of metal pipes, hoses that have been fastened by caulking joint fittings to both ends of a hose consisting of a high-flexibility polymer material and a fiber reinforced layer of metal wires and fibers have been used as piping members. It has become.

  In addition, the space in which the piping for supplying hot water and hot water is provided is relatively narrow, and the length of the hose used is short, so the hose is often bent forcibly during construction. As a result, the hose is bent and kinks are generated. In that case, the water passage is blocked and water cannot be passed or the amount of water flow is reduced. Was needed. In addition, in order to obtain good workability in a limited space where water supply and hot water supply pipes are provided, the hose must have excellent flexibility.

  From such a point, there has been a demand for a hose that is strong against kinking due to bending during construction without impairing the flexibility of the hose. In order to meet this requirement, it has been proposed to bond the inner layer tube and the fiber reinforced layer or between the fiber reinforced layer and the outer layer and integrate the layers (for example, see Patent Documents 1 to 3).

JP 2006-266274 A JP-A-9-178057 Japanese Patent Laid-Open No. 10-52887

  Here, as an outer layer of a hose, an olefin-based polymer that is excellent in water resistance, chemical resistance, workability, dirt resistance, and the like and is a flexible material has recently been preferably selected. However, since the olefin-based polymer has a low surface energy and is chemically inert, there is a problem that it is particularly difficult to adhere to an adjacent fiber reinforcing layer.

  In the hose according to Patent Document 1, the outer layer provided on the outer side of the fiber reinforcement layer is made of a polyurethane thermoplastic elastomer or a polyester thermoplastic elastomer, and a specific adhesive layer is used to bond the fiber reinforcement layer and the outer layer. It demonstrates the nature. In the adhesive layer described in Patent Document 1, it is considered that sufficient adhesiveness cannot be obtained when applied to an outer layer containing an olefin polymer.

  Moreover, although the hose of patent document 2 uses the specific urethane type adhesive for adhesion | attachment with the fiber reinforcement layer surface-treated through the adhesive agent, and an outer layer, a specific urethane type adhesive is handled. There is also the problem that it is difficult. Moreover, when the adhesive described in this patent document 2 is applied to an outer layer containing an olefin polymer, it is considered that sufficient adhesiveness cannot be obtained. Furthermore, since the fiber reinforced layer surface-treated with an adhesive is used, the flexibility of the hose may be impaired.

  Moreover, the hose of patent document 3 uses maleic anhydride modified polyolefin resin and polyester resin as a thermoplastic adhesive resin. However, in this patent document 3, since the maleic anhydride modified polyolefin is used in the form of resin as it is, sufficient adhesiveness is not obtained. In addition, the material used is limited, for example, sufficient adhesiveness cannot be obtained unless a polyolefin-based thermoplastic resin containing an elastomer component that is at least partially crosslinked is used as the outer layer.

  The present invention has been made to solve such problems of the prior art, and the object of the present invention is to generate kinks even when excessive mechanical external force or bending is applied. By providing excellent kink resistance and flexibility, it has excellent handleability and workability, has sufficient pressure resistance and durability, and offers excellent productivity. is there.

In order to achieve the above object, a hose according to claim 1 of the present invention is a tube made of a flexible material, a fiber reinforcing layer formed on the outer periphery of the tube, and an outer layer formed on the outer periphery of the fiber reinforcing layer. The material constituting the outer layer contains an olefin polymer, and the fiber reinforcing layer and the outer layer are bonded via an olefin adhesive containing maleic acid-modified amorphous polyolefin resin as a component. It is characterized by that.
The hose according to claim 2 is characterized in that the adhesive contains a crystalline polyolefin resin.
The hose according to claim 3 is characterized in that the fiber reinforcing layer has a shielding rate of 80% or more.
The hose according to claim 4 is characterized in that the tube and the fiber reinforcing layer are not provided with an adhesive.
According to a fifth aspect of the present invention, there is provided a hose manufacturing method comprising: forming a tube made of a flexible material; forming a fiber reinforcing layer on the outer periphery of the tube; and forming an outer layer containing an olefin polymer on the outer periphery of the fiber reinforcing layer. In the method of manufacturing a hose, a liquid olefin-based adhesive comprising a maleic acid-modified amorphous polyolefin resin as a component is applied to the fiber reinforcement layer, and the fiber reinforcement layer and the outer layer are bonded. To do.
The hose manufacturing method according to claim 6 is characterized in that the fiber reinforcement layer is formed so that the shielding rate is 80% or more.

  According to the present invention, the fiber reinforcing layer and the outer layer are satisfactorily bonded to each other even with the outer layer containing the olefin polymer by the olefin adhesive with the maleic acid-modified olefin resin as a component. Therefore, even when excessive mechanical external force or bending is applied, it has excellent kink resistance that does not cause kinking, and is excellent in handleability and workability. Further, when bending is applied, the outer layer also has outer layer smoothness that hardly causes wrinkles. Moreover, since the material which comprises an outer layer contains the olefin polymer, it is excellent in water resistance, chemical resistance, workability, stain resistance, etc., and also in flexibility. Further, the fiber reinforcing layer has sufficient pressure resistance and durability.

  The tube used in the present invention may be a single layer, or may be a laminate of a plurality of layers such as a so-called inner layer or intermediate layer.

  The tube material used in the present invention is made of a flexible material such as resin or rubber. Specifically, for example, polyolefin resin, polyamide resin, polyurethane resin, polyester resin, olefin elastomer, polyurethane elastomer, polyester elastomer, styrene elastomer, natural rubber, isoprene rubber, acrylic rubber, ethylene propylene Examples thereof include rubber, butadiene rubber, styrene butadiene rubber, butyl rubber, chloroprene rubber, chlorosulfonated polyethylene, chlorinated polyethylene, and nitrile-butadiene rubber. Among these, it is preferable that it is comprised from the composition formed by containing polyolefin resin. Among the compositions containing a polyolefin resin, if the composition contains polyethylene and an ethylene-α-olefin copolymer, the flexibility and chlorine resistance of the tube can be improved. Therefore, it is more preferable.

Polyethylene originally has a property excellent in chlorine resistance, and various polyethylenes are known. In the present invention, polyethylene having a density of 0.942 g / cm ³ or less is appropriately selected or combined. It is preferable to use it. When the density of polyethylene exceeds 0.942 g / cm ³ , the flexibility of the tube is lowered, and the handleability and workability of the hose obtained by the present invention tend to deteriorate.

  The ethylene-α-olefin copolymer is a material in which ethylene and α-olefin are copolymerized and has excellent flexibility. Examples of the α-olefin include propylene, butene-1, pentene-1, hexene-1, 4-methylpentene-1, heptene-1, octene-1, decene-1, dodecene-1, and the like. In addition, since various ethylene-α-olefin copolymers are commercially available, they may be appropriately selected and used.

  If these polyethylenes with excellent flexibility and chlorine resistance and ethylene-α-olefin copolymers with excellent flexibility are blended appropriately, it is possible to obtain tubes with particularly excellent flexibility and chlorine resistance. It becomes. In addition, it is also possible to obtain desired characteristics by adding other compounding materials to the above composition. For example, the chlorine resistance may be further improved by appropriately adding an antiaging agent or the like.

  The wall thickness of the tube is preferably in the range of 0.6 to 3 mm. If the wall thickness is less than 0.6, it may be difficult to obtain a sufficient breaking pressure that can withstand actual use when the intermediate layer is provided. On the other hand, if the wall thickness exceeds 3 mm, the flexibility is lowered and it becomes difficult to bend, and the handleability and workability of the hose obtained by the present invention may be deteriorated.

  In the present invention, the composition is preferably formed into a tubular shape by a known forming means such as extrusion and then subjected to crosslinking. The polyolefin resin as described above has a low heat-resistant temperature, and when used as a hot water supply hose, the temperature of the hot water transferred through the hose may reach about 90 ° C. This is because in some cases, it is necessary to increase the pressure resistance at high temperatures by performing crosslinking. Examples of the cross-linking means include peroxide cross-linking, silane cross-linking, and electron beam cross-linking. In the present invention, it is preferable to employ electron beam cross-linking among these. This is because it is not necessary to add other materials such as a crosslinking agent like peroxide crosslinking or silane crosslinking, and a material with a high degree of freedom can be selected.

  In the present invention, at least one fiber reinforcing layer is formed on the outer periphery of the tube. By this fiber reinforcement layer, a sufficient breaking pressure can be applied to the hose, and greater durability can be provided. The fiber reinforcement layer is composed of a braid of fiber yarn or a spiral shape, but the braid is preferably used because there is little displacement of the fiber reinforcement layer. Of course, the fiber reinforcement layer may be a multilayer.

  As the fiber yarn, various organic fibers and inorganic fibers can be used, and examples thereof include vinylon fiber, polyester fiber, nylon fiber, aramid fiber, rayon fiber, polyethylene fiber, cotton, and glass fiber. These fibers are braided or spiraled at a shielding rate of 80% or more, a twist number of 0 to 250 times / m, an alignment number of 1 to 8, a batting number (standing number) of 12 to 48, and a braiding angle of 48 to 61 degrees. This is selected according to the conditions of use of the hose. The shielding rate here refers to the ratio of the fiber yarn covering the tube surface. When the shielding rate is less than 80%, kinks are likely to be generated starting from the gap, and breakage is easily broken from the gap of the fiber reinforced layer during pressurization. In addition to this fiber yarn, a metal wire such as a stainless steel wire may be appropriately mixed for reinforcement.

  In the present invention, an outer layer is formed on the outer periphery of the fiber reinforcing layer. The constituent material of the outer layer is arbitrarily selected from known materials, but in the present invention, an olefin polymer is included. Examples of the olefin polymer include blends of a plurality of olefin resins such as an olefin resin, an olefin copolymer resin, and an olefin elastomer. The constituent material of the outer layer may be blended other than the olefin polymer. For example, it is possible to blend urethane resin, polyester resin, polyamide resin, styrene copolymer resin, polyurethane elastomer, polyester elastomer, styrene elastomer, silicone rubber, and the like. The materials mentioned as the constituent material of the tube may be used as the constituent material of the outer layer. Since such an olefin polymer is excellent in water resistance and chemical resistance, the water resistance and chemical resistance of the hose are improved by forming an outer layer containing the olefin polymer. Moreover, since such an olefin-type polymer is excellent also in the softness | flexibility, the fall of the flexibility by forming an outer layer can be suppressed.

  By forming such an outer layer, it is possible to further reduce the occurrence of kinks against bending, and it is difficult to get dust and dirt on the surface of the hose, the surface can be easily cleaned, and The dirtiness can be improved.

  In the present invention, the fiber reinforcing layer and the outer layer are bonded together via an olefin adhesive containing a maleic acid-modified olefin resin as a component. Examples of the olefin resin modified with maleic acid include ethylene, propylene, butene-1, hexene-1, 3methyl-butene-1, 4-methylpentene-1, heptene-1, octene-1, decene-1, A homopolymer of an α-olefin having 2 or more carbon atoms such as dodecene-1, a random or block polymer of these two or more monomers, or an α-olefin having 2 or more carbon atoms as a main component, and other monomers Random or block, polymers such as grafts, or mixtures thereof. Among these, ethylene or propylene is preferable as the olefin resin in the present invention. The maleic acid mentioned here includes maleic anhydride and the like.

  Since the outer layer contains an olefin polymer, the adhesive is relatively limited because it has relatively poor adhesion. Unless the adhesive is an olefin adhesive composed of maleic acid-modified olefin resin, sufficient adhesion is It may not be obtained.

  The maleic acid-modified olefin resin that is a component of the olefin-based adhesive has a stronger adhesion between the fiber reinforced layer and the outer layer when the amorphous polyolefin resin is maleic acid-modified. It will be a thing. Examples of the amorphous polyolefin resin to be modified with maleic acid include amorphous polypropylene, amorphous propylene-ethylene copolymer, amorphous propylene-butene copolymer, and amorphous propylene-ethylene-butene copolymer. and so on. Among these, amorphous polypropylene is preferable as the amorphous olefin resin in the present invention.

  Furthermore, adhesiveness becomes stronger because the olefin-based adhesive contains a crystalline olefin resin. At this time, it is even better if the amorphous polyolefin resin is the main adhesive component. The main adhesive component here refers to 50% or more (weight ratio) of the adhesive component. The content of the crystalline olefin resin is preferably 5 to 50%, more preferably 10 to 30%.

  When the olefin polymer contained in the outer layer is polypropylene, those obtained by modifying the amorphous polypropylene with maleic acid and those containing crystalline polypropylene are preferably used.

  In the present invention, the above-described adhesive is applied to the fiber reinforcing layer in a liquid state. If the adhesive is liquid, the adhesiveness is further strengthened by a so-called anchor effect in which the adhesive is impregnated in the gaps of the fiber reinforcement layer and the adhesive component is entangled with the fiber reinforcement layer.

  As a method for making the adhesive liquid, a method in which a predetermined adhesive component is dissolved in a solvent is preferably used. When the main adhesive component is an amorphous polyolefin modified with maleic acid, it is not necessary to use a solvent that is a problem in sick houses such as toluene and xylene. Can be dissolved in a good solvent. When the adhesive component is dissolved in the solvent, the stability of the adhesive can be obtained by adding about 20% of a poor solvent such as ethyl acetate.

  In the present invention, as described above, the fiber reinforcing layer and the outer layer are bonded via an adhesive, but it is also conceivable that the tube and the fiber reinforcing layer are bonded via an adhesive. . However, even if the tube and the fiber reinforcing layer are bonded, the improvement of kink resistance is not expected so much, but rather the flexibility is lowered. Therefore, it is preferable that the tube and the fiber reinforcement layer do not have an adhesive.

  Many of the hoses obtained in this way are used for actual use with connecting joints attached to the opposite members at both ends thereof. As the connection joint, one processed by metal or resin is known.

  As described above, since the fiber reinforcing layer and the outer layer of the hose are well bonded via an adhesive, kinks are generated even when excessive mechanical external force or bending is applied during construction. Excellent kink resistance can be obtained. Here, if wrinkles occur in the outer layer when bending is applied, it is highly possible that cracks will occur from the valleys of the wrinkles and material destruction will occur. Therefore, it is necessary to suppress the generation of wrinkles as much as possible. The above-mentioned hose has the outer layer smoothness in which the outer layer is less likely to be wrinkled when the fiber reinforcing layer and the outer layer are adhered to each other, so that cracks due to the wrinkles can be prevented. it can.

  Embodiments of the present invention will be described below together with comparative examples with reference to the drawings.

Example 1
As shown in FIG. 1, first, a composition in which a polyethylene resin (density 0.93 g / cm ³ ) and an ethylene copolymer resin are mixed at a mixing ratio of 80:20 has an inner diameter of 9.0 mm and a wall thickness of 1.0 mm. After extruding into a tubular shape, it was crosslinked by irradiating with an electron beam to form an inner layer 2a. Next, on the outer periphery of the inner layer 2a, a polyurethane elastomer was extrusion-coated so as to have a thickness of 0.7 mm to form an intermediate layer 2b, whereby a two-layer tube 2 was obtained. Next, the polyester fiber is braided at 1670 decitex, the number of twists 0 times / m, the number of aligned ones, the number of striking (standing number) 24, and the braiding angle 54 degrees. Formed. Next, a composition in which a maleic acid-modified amorphous polypropylene resin and a crystalline polypropylene resin are mixed at a mixing ratio of 80:20 is used as an adhesive component, and an adhesive in which this adhesive component is dissolved in a solvent is applied to the fiber reinforcement layer 3. After application, the solvent was dried. A resin mixture obtained by adding an additive to a mixture of a polypropylene resin (olefin polymer) and a styrene copolymer resin at a mixing ratio of 60:40 on the outer periphery of the fiber reinforcing layer 3 to which the adhesive is applied has a thickness of 0. The outer layer 4 was formed by extrusion coating to a thickness of 5 mm. The finished outer diameter of the hose 1 thus obtained was 13.7 mm, and the shielding rate of the fiber reinforcement layer 3 was 100%.

Example 2
A hose 1 was obtained by the same material, configuration, and production method as in Example 1, except that the adhesive component was 100% amorphous polypropylene resin modified with maleic acid. The finished outer diameter of the hose 1 thus obtained was 13.7 mm, and the shielding rate of the fiber reinforcement layer 3 was 100%.

Example 3
The hose 1 is made of the same material, configuration, and manufacturing method as in Example 1 except that the composition is a mixture of an amorphous polypropylene resin modified with maleic acid and a crystalline polypropylene resin at a mixing ratio of 40:60. Obtained. The finished outer diameter of the hose 1 thus obtained was 13.7 mm, and the shielding rate of the fiber reinforcement layer 3 was 100%.

Example 4
The structure of the fiber reinforced layer is 1100 dtex, the number of twists 0 times / m, the number of alignments 1, the number of striking (stands) 24, the braid angle is 54 degrees, and the braided polyester fiber is used in Example 1. The hose 1 was obtained by the same material, structure, and manufacturing method. The finished outer diameter of the hose 1 thus obtained was 13.7 mm, and the shielding rate of the fiber reinforced layer 3 was 80%.

Example 5
The outer layer is composed of a mixture of polypropylene resin (olefin polymer) and olefin copolymer resin mixed at a mixing ratio of 25:75, and an olefin resin mixture obtained by adding an additive so as to have a thickness of 0.5 mm. The hose 1 was obtained by the same material, configuration, and manufacturing method as in Example 1. The finished outer diameter of the hose 1 thus obtained was 13.7 mm, and the shielding rate of the fiber reinforcement layer 3 was 100%.

Comparative Example 1
The fiber reinforced layer was composed of 830 dtex, 0 twists / m, 1 alignment, 24 striking (stands), and a braid angle of 54 degrees. The hose 1 was obtained by the same material, structure, and manufacturing method. The finished outer diameter of the hose 1 thus obtained was 13.7 mm, and the shielding rate of the fiber reinforced layer 3 was 75%.

Comparative Example 2
A hose 1 was obtained by the same material, configuration, and manufacturing method as in Example 1 except that the adhesive component was polyurethane resin. The finished outer diameter of the hose 1 thus obtained was 13.7 mm, and the shielding rate of the fiber reinforcement layer 3 was 100%.

  Using each hose thus obtained as a sample, tests for outer layer adhesion, kink resistance, flexibility, outer layer smoothness, and breaking pressure measurement were performed. Of these tests, the test for measuring the breaking pressure was performed by connecting joints at both ends of the hose as shown in FIG. The connecting joint 10 used in this test is composed of a nozzle 11 made of a dezincing-resistant copper alloy or the like, a nut 12 made of a copper alloy or the like, and a sleeve 13 made of SUS304 or the like. As a method of connecting joint processing, first, the nozzle 11 previously passed through the nut 12 was inserted into the hose 1 with the sleeve 13 before caulking disposed on the hose 1. Then, the sleeve 13 was pressed and deformed into a substantially concentric cylinder with respect to the nozzle 11 and caulked. The results of the above test are shown in Table 1.

  The six types of hoses obtained in Examples 1 to 4 and Comparative Examples 1 and 2 were used as samples, and an evaluation test was performed on the adhesion between the outer layer 4 and the fiber reinforcing layer 3 as the outer layer adhesion. The outer layer adhesiveness shows the result of cutting a hose into a length of 25 mm and measuring the peel strength (kN / m) at 180 degrees. The test temperature was 25 ° C.

  The hose actually used as water supply / hot water supply preferably has an outer layer adhesion of 0.5 kN / m or more. According to Table 1, it was confirmed that any hose of the example exhibited good outer layer adhesion because the outer layer adhesion was 0.5 kN / m or more. In Comparative Example 1, since the shielding rate of the fiber reinforced layer was 75%, the outer layer adhesiveness was less than 0.5 kN / m, and the adhesiveness was not sufficient. Moreover, the comparative example 2 using a urethane type adhesive agent has outer layer adhesiveness 0.05 kN / m, and was hardly adhere | attached.

  The six types of hoses obtained in Examples 1 to 4 and Comparative Examples 1 and 2 were used as samples, and an evaluation test for the minimum bending radius was performed as confirmation of kink resistance (handleability and workability). The minimum bend radius was measured by gradually bending each sample and kinking and bending the hose. The test temperature was 25 ° C.

  The hose actually used as water supply / hot water supply is flexible and should not be easily kinked in order to improve handling and workability. Therefore, the smaller the minimum bending radius, the better. According to Table 1, the minimum bend radius of any of the hoses in the examples is not more than twice the hose outer diameter, exhibits excellent kink resistance, and does not easily generate kinks when bent to a small bend radius. Was recognized. In Comparative Examples 1 and 2, since the outer layer adhesive strength is not sufficient, the minimum bending radius is larger than twice the hose outer diameter.

  Next, the six types of hoses obtained in Examples 1 to 4 and Comparative Examples 1 and 2 were used as samples, and flexibility (handleability and workability) tests were performed. In the flexibility test, the stress when bent to a radius of 50 mm was measured. The test temperature was 25 ° C.

  When attaching a hose to a narrow or deep position, it is necessary to bend the hose with a slight force, so it is better that the stress by this test is small, especially the stress is 13 N or less. It is preferable to have flexibility. According to Table 1, in any of the hoses of Examples and Comparative Examples, the stress was 13 N or less, and it was confirmed that the hose had particularly excellent flexibility.

  Next, the outer layer smoothness test was conducted using the six types of hoses obtained in Examples 1 to 4 and Comparative Examples 1 and 2 as samples. The outer layer smoothness test is a test for confirming the difficulty of occurrence of wrinkles in the outer layer. The hose was bent to a radius of 35 mm, and the occurrence of wrinkles in the outer layer was confirmed. The test temperature was 25 ° C.

  When attaching a hose to a narrow position or a recessed position, it is preferable that no wrinkles occur in the outer layer, and in particular, it was determined that no wrinkles occur in the outer layer when bent to a radius of 35 mm. According to Table 1, in any of the hoses of the examples, there was no generation of wrinkles in the outer layer when bent to a radius of 35 mm, and it was confirmed that the hose had excellent outer layer smoothness. About Comparative Examples 1-2, since outer layer adhesive strength was not enough, when bent to a radius of 35 mm, wrinkles occurred in the outer layer.

  Next, a test for measuring the breaking pressure was performed on the six types of hoses obtained in Examples 1 to 4 and Comparative Examples 1 and 2. The test temperature was 25 ° C.

  According to Table 1, the pressure at the time of destroying any hose of the example was 10 MPa or more, and it was confirmed that the hose had a sufficient breaking pressure. However, in Comparative Example 1, since the shielding rate of the fiber reinforcement layer was 75%, the fracture pressure was lower than those in Examples 1-6.

  As described above, the hose of the present invention is provided with excellent kink resistance and excellent flexibility that does not cause kink even when excessive mechanical external force or bending is applied. In addition to being excellent in workability and workability, it has sufficient pressure resistance and durability, and has excellent productivity. Therefore, it can be suitably used in a wide range of applications such as water supply piping, water supply / hot water supply piping, and the like.

It is a partially notched perspective view which shows the structure of the hose obtained by the Example of this invention. It is a partially notched side view which shows the state which attached the connection coupling to the both ends of the hose obtained by the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hose 2 Tube 2a Inner layer 2b Middle layer 3 Fiber reinforcement layer 4 Outer layer 10 Connection joint 11 Nozzle 12 Nut 13 Sleeve

Claims (6)

A tube made of a flexible material, a fiber reinforcing layer formed on the outer periphery of the tube, and an outer layer formed on the outer periphery of the fiber reinforcing layer, and the material constituting the outer layer includes an olefin polymer. The hose characterized in that the fiber reinforcing layer and the outer layer are bonded via an olefin-based adhesive comprising a maleic acid-modified amorphous polyolefin resin as a component. 2. The hose according to claim 1 , wherein the adhesive contains a crystalline polyolefin resin. The hose according to claim 1 or 2 , wherein the fiber reinforcement layer has a shielding rate of 80% or more. The hose according to any one of claims 1 to 3, wherein the tube and the fiber reinforcing layer are not provided with an adhesive. In a hose manufacturing method, a tube made of a flexible material is formed, a fiber reinforcement layer is formed on the outer periphery of the tube, and an outer layer containing an olefin-based polymer is formed on the outer periphery of the fiber reinforcement layer. A method for producing a hose comprising applying a liquid olefin-based adhesive comprising a maleic acid-modified amorphous polyolefin resin as a component, and bonding the fiber reinforcing layer and the outer layer. 6. The method for manufacturing a hose according to claim 5, wherein the fiber reinforcement layer is formed so as to have a shielding rate of 80% or more.

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