JP2020033677A - Belt-like fabric for hose, and hose using the same - Google Patents

Abstract

To provide a belt-like fabric for a hose capable of preventing bulge and thread breakage.SOLUTION: The belt-like fabric 14 for a hose covers an outer periphery of an inner tube rubber 12 of a hose 10, and is covered with a wire 16 and a rubber 18 outside. The belt-like fabric 14 for a hose is a belt-like fabric 14 formed by warp and weft where the elongation at break of the warp according to JIS L1095:2010 is 20% or more, and the hot water dimensional change rate of the weft according to JIS L1013 is 5% or less under the condition of 100°C hot water×30 min.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a band fabric for a hose and a hose using the same, and particularly to a band fabric for a high pressure hose and a high pressure hose through which a high-pressure fluid flows.

  As such a hose, for example, there is a hose described in Patent Document 1 below. This hose is configured in such a manner that a reinforcing layer made of a wire and rubber wound spirally in the opposite direction for each layer is coated with a predetermined layer on the outer side of the inner tube rubber, and the outermost layer is coated with a jacket rubber. . In this hose, a band-shaped fabric is further spirally wound and covered between the innermost reinforcing layer (first reinforcing layer) and the inner tube rubber, and the spiral direction of the band-shaped fabric is set to the wire of the first reinforcing layer. In addition to the direction opposite to the spiral direction, the thickness, the longitudinal strength, and the unit mass of the belt-like fabric are defined. By defining the spiral direction and the specifications of the band-like fabric in this way, the durability and pressure resistance of the hose are improved.

JP 2005-147345 A

  However, in the above-mentioned hose, when a high-temperature fluid flows through the hose in a crimped state at the time of use and the temperature of the hose rises, a bulge which may cause a decrease in functionality or damage may occur. . In addition, it is also required that the band-shaped cloth does not break when the hose is crimped.

  Therefore, an object of the present invention is to provide a band fabric for a hose that can prevent occurrence of bulge and thread breakage. Another object of the present invention is to provide a hose using the hose band-shaped fabric.

  An object of the present invention is to provide a band fabric for a hose in which the outer circumference of an inner tube rubber of a hose is coated and a wire and a rubber are coated on an outer side thereof. The hose is formed of a warp and a weft. Is not less than 20%, and the warp dimensional change rate according to JIS L1013: 2010 is at most 5% under the condition of 100 ° C. hot water × 30 minutes.

  Although the belt-like fabric is generally formed from a warp and a weft, the warp has an important effect on the properties of the belt-like fabric, and the weft has an auxiliary role. It has been found by the present inventors that the bulge and yarn breakage are prevented by setting the cut elongation and the thermal dimensional change rate of the warp of the belt-shaped fabric in the above ranges.

Preferred embodiments of the hose fabric of the present invention are as follows.
(1) The warp is a polyester fiber.
(2) The strip cloth is impregnated with a dip liquid.
(3) At least a part of the fibers constituting the cloth is covered with rubber cement.
(4) The warp of the belt-like fabric has a thickness of 235 to 1670 dtex.
(5) The driving number of the belt-like fabric is 20 to 50/50 mm.

  Further, the above object is a hose having the band fabric for hose of the present invention, wherein the band fabric for hose is spirally wound around the outer circumference of the inner pipe rubber so as to overlap with a predetermined width, and the outside thereof is covered. This is achieved by a hose in which the wire and the rubber are covered with a predetermined number of layers, and the outermost layer is covered with a jacket rubber.

Preferred embodiments of the hose of the present invention are as follows.
(1) The angle at which the band-shaped fabric is wound around the outer circumference of the inner tube rubber is 45 to 70 degrees with respect to the axial direction of the hose.

  As described above, according to the present invention, it is possible to provide a hose band-like fabric that can prevent occurrence of bulge and thread breakage. Therefore, the hose manufactured using the hose band fabric can maintain the function of the hose for a long period of time even under severe conditions such as a high-temperature fluid flowing inside the hose. .

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows one Embodiment of the hose using the strip | belt-shaped cloth for hoses of this invention. It is explanatory drawing of the strip | belt-shaped fabric for hoses before a rubber cement is coat | covered. It is explanatory drawing of the strip | belt-shaped cloth for hoses in the state which covered rubber cement. FIG. 4 is a detailed view of the hose band fabric of FIG. 3. It is sectional drawing of FIG. It is process explanatory drawing of the winding coating of the band fabric for hoses to inner tube rubber.

  Hereinafter, an embodiment of a band fabric for a hose and a hose according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of a hose using the hose band fabric of this embodiment. The hose 10 is a so-called high-pressure hose in which a high-pressure fluid, for example, oil is circulated, and is used for, for example, a hydraulic pipe of a construction machine. This high pressure hose 10 is also called a wire spiral hose. The hose of the present invention can be used for various fields other than these uses.

  In the hose 10, a band-like fabric for a hose (hereinafter, also simply referred to as a band-like fabric) 14 is spirally wound around the outer periphery of an inner tube rubber 12 through which a fluid flows, and is coated on the outside thereof in layers. A reinforcing layer 20 composed of a wire 16 and a rubber 18 wound in a reverse spiral is coated with a predetermined layer, in this example, four layers, and an outermost rubber layer 22 is coated on the outermost layer. The rubber 18 of the reinforcing layer 20 is also called an intermediate rubber, and has a layered structure of only the intermediate rubber 18 in the drawing. However, as is well known, the intermediate rubber 18 is formed by a gap between the wires 16 and the band-shaped cloth 14. It penetrates into the weave, and plays a role of bonding and fixing the wires 16 to each other, the wire 16 and the band-shaped fabric 14, the band-shaped fabric 14 or the wire 16 and the inner tube rubber 12, and the wire 16 and the jacket rubber 22 to each other. The wire is generally made of steel (metal).

  Various rubber materials are used for the inner pipe rubber 12 according to the fluid circulated therein. For example, when the internal circulating fluid is oil, oil resistance is required. For example, an NBR rubber material is used. Other rubber materials can be used. The inner tube rubber 12 is in an unvulcanized rubber state in the winding and covering step of the band-shaped fabric 14 and the wire 16 and is vulcanized after the winding and covering step. As rubber materials constituting the inner tube rubber layer, nitrile rubber (NBR), styrene butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR), natural rubber (NR), ethylene propylene diene rubber (EPDM) ) And the like may be appropriately combined, and in some cases, may be used alone. In addition, compounding agents such as a processing aid, an antioxidant, a vulcanizing agent, a reinforcing agent, and a vulcanization accelerator, which are generally used, can be appropriately added to the material.

  The belt-shaped fabric 14 is spirally wound around the outer periphery of the inner tube rubber 12 and covered, thereby preventing the outer wire 16 from biting into the unvulcanized inner tube rubber 12. Further, in order that the wire 16 does not bite into the inner tube rubber 12, the band-shaped cloth 14 is overlapped with each other in a preset overlapping state in a state where a predetermined tension is applied, that is, with a predetermined width. The outer circumference of the inner tube rubber 12 is wound and covered. The band-like fabric 14 will be described in detail later, but is a fabric, that is, a woven fabric composed of a warp and a weft, and, for example, an aramid fiber or a polyester fiber is used as a fiber material. In this embodiment, a plain-woven cloth is used, which makes it easy to obtain a long strip-shaped cloth 14.

  The wire 16 of the reinforcing layer 20 is wound and covered in a spiral state in each layer so that the spiral direction is reversed for each layer. The rubber 18 of the reinforcing layer 20, that is, the intermediate rubber, enters the gaps of the wires 16 or the weave of the band-shaped fabric 14, and adheres and fixes them. The same rubber material is generally used for the intermediate rubber 18 of the reinforcing layer 20 for all the layers, for example, CR rubber. The number of the reinforcing layers 20, that is, the number of the wire-wrapped coatings, is set according to the strength required for the hose 10 and the thickness of the hose 10. The required strength of the hose 10 depends on the pressure of the internal fluid. In the figure, the rubber 18 is coated on the outside of the band-shaped fabric 14, and the wire 16 is wound and coated on the outside thereof, for example, the wire 16 is wound on the outside of the band-shaped fabric 14 in a spiral state, and is covered. The intermediate rubber 18 may be covered from the outside. As the rubber component constituting the intermediate rubber layer, NBR, hydrogenated NBR (HNBR), SBR, BR, natural rubber (NR), EPDM, and the like may be appropriately combined, and in some cases, may be used alone. In addition, compounding agents such as a processing aid, an antioxidant, a vulcanizing agent, a reinforcing agent, and a vulcanization accelerator, which are generally used, can be appropriately added to the material. Note that a cord (a wire obtained by twisting small diameter wires) may be used instead of the wire 16. Also in the case of a cord, it is general that the cord is made of steel (metal).

  The outer cover rubber 22 is mainly coated on the outermost layer to protect the hose 10 itself, and therefore is required to have strength such as abrasion resistance against scratching and scratch resistance. Therefore, for example, CR rubber is used for the jacket rubber 22. As rubber components constituting the outer rubber layer, nitrile rubber (NBR), styrene butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR), natural rubber (NR), ethylene propylene diene rubber (EPDM) ) And the like may be appropriately combined, and in some cases, may be used alone. In addition, compounding agents such as a processing aid, an antioxidant, a vulcanizing agent, a reinforcing agent, and a vulcanization accelerator, which are generally used, can be appropriately added to the material.

  FIG. 2 is a front view of the band-shaped cloth 14A in a material state. The belt-like fabric 14A is woven by plain weaving a warp and a weft. By performing plain weaving, it is possible to easily obtain the belt-like fabric 14A in a long material state.

  What is characteristic in the present invention is that the warp of the belt-shaped fabric 14A has a cut elongation of 20% or more according to JIS L1095: 2010, and the hot water dimensional change rate of the warp according to JIS L1013 is 100 ° C. hot water × 30 minutes. The condition is to use one that is 5% or less. It is the warp that has an important effect on the characteristics of the belt-like fabric 14A, and the weft has an auxiliary role. By setting the cutting elongation and the hot water dimensional change rate of the warp of the belt-like fabric 14A in the above ranges, the occurrence of bulge and yarn breakage is prevented. If the elongation at break of the warp is less than 20%, the elongation characteristics are not sufficient, and yarn breakage may occur when a hose is crimped. If the hot water dimensional change rate of the warp exceeds 5%, the hot water dimensional change rate at the time of vulcanization or heating increases, causing distortion between the warp and the inner tube rubber, and bulging may occur.

  The preferred range of the elongation at break is 20 to 40%, particularly 25 to 35%. The preferred range of the hot water dimensional change is 4% or less, particularly 3% or less, and more preferably 2% or less. Within these ranges, the effect of preventing bulge and thread breakage is further increased.

  As the material of the warp of the belt-like fabric 14A, any material can be used as long as it satisfies the above-described cutting elongation and hot water dimensional change rate. Specifically, it is preferable to use polyester. As the polyester, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT) and the like can be used. Particularly, PET is preferable. The polyester preferably has a molecular weight of 20,000 to 150,000.

  The weft is not particularly limited, and a polyamide fiber or a polyester fiber conventionally used can be used. Similarly to the warp, a fiber whose cut elongation according to JIS L1095: 2010 is 20% or more and whose dimensional change rate of the warp according to JIS L1013: 2010 is 5% or less under the condition of hot water at 100 ° C. for 30 minutes is used. It is also possible to use.

  In addition, the thickness of the warp of the band-shaped fabric 14A is set based on the evaluation of JIS L1095: 2010 (general spun yarn test method), and is 235 to 1670 dtex, preferably 400 to 1100 dtex in the constant length type per 10,000 m. . If the thickness of the warp is less than 235 dtex, the frequency of occurrence of yarn breakage due to crimping / heating is high, and if it exceeds 1670 dtex, the rigidity of the hose is not greatly bent.

  The number of driving of the belt-like fabric 14A is set based on the evaluation of JIS L1096 (a method of testing fabric and knitted fabric), and the number of driving per 50 mm is 20 to 50 warp / 50 mm, preferably 25 to 40. Book / 50 mm, the weft is 10 to 40/50 mm, preferably 15 to 30/50 mm. If the number of warp yarns is less than 20 yarns / 50 mm, the frequency of yarn breakage due to crimping / heating is high, and if it exceeds 50 yarns / 50 mm, the rigidity of the hose is not large and does not bend. If the number of wefts is less than 10/50 mm, the frequency of thread breakage due to crimping / heating is high, and if it is more than 40/50 mm, the rigidity of the hose is not greatly bent.

  It is preferable to impregnate the strip-like cloth 14A in the raw material state with a dip liquid (not shown) for improving the adhesiveness to rubber, as in the related art. The impregnation with the dipping liquid is performed, for example, by passing the material-like band-shaped cloth 14A through the dipping liquid tank while transporting it in the longitudinal direction. As the dip solution, those conventionally used can be used, and for example, resorcinol-formaldehyde latex (RFL) can be used.

  It is preferable that the belt-like cloth 14A in the material state impregnated with the dip liquid is coated with the rubber cement 24, for example, by applying a rubber cement 24 to the fibers. As a result, at least a part of the fibers constituting the fabric is fixed with the rubber cement, so that the weave is not easily displaced even if it is spirally wound around the inner tube rubber and covered. Further, when the fiber of the fabric is impregnated with the dipping liquid, the dipping liquid is hardly exposed to oxygen in the air due to the rubber cement coating, so that the deterioration of the dipping liquid can be suppressed. Therefore, workability during hose production can be improved. It is more preferable that all the fibers constituting the fabric are covered with rubber cement. When the dip liquid is impregnated, the adhesiveness between the fibers constituting the fabric and the rubber cement is improved. Furthermore, since the dipping liquid impregnated in the fiber is hardly exposed to oxygen in the air, deterioration of the dipping liquid can be suppressed. As a result, workability during hose production can be improved.

  As shown in FIG. 3, for example, as shown in FIG. 3, the belt-like cloth 14A in the raw material state is impregnated with the dipping liquid between the rollers 30 rotating opposite to each other. While the rubber cement 24 is formed on the entrance side, the rubber cement 24 adhering to the surface of the material-like band-shaped cloth 14A passing through the rubber cement pool is uniformly extended by the roller 30. As the rubber cement 24, for example, an unvulcanized rubber paste is preferably used, and it is preferable that the rubber cement 24 contains NBR-based rubber from the viewpoint of adhesiveness to the wire 16. Further, the coating thickness of the rubber cement 24 is preferably, for example, 0.01 mm to 0.5 mm.

  In addition, it is preferable that the belt-shaped cloth 14A is plain-woven so that the woven porosity after covering with the rubber cement 24 is 20 to 70%, preferably 30 to 60%. The definition of the weave porosity is set from the viewpoint that the intermediate rubber 18 can enter or that the wire 16 coated on the outside does not bite into the inner tube rubber 12 as described later. Since the texture porosity of the rubber cement coated state is 20% or more, even if the outer circumference of the inner pipe rubber is wound and coated so as to overlap with a predetermined width, the rubber coated on the outer side is not covered with the inner pipe. It is possible to reach the rubber. In addition, when the texture porosity in the state covered with the rubber cement is 70% or less, it is possible to prevent the wire covered on the outside from biting into the inner tube rubber. Therefore, it is possible to improve the workability at the time of manufacturing the hose. The porosity referred to here is 100% when the rubber cement is not applied to the fiber.

  The rubber cement as used herein refers to a composition containing at least a rubber component and a solvent for dissolving the rubber component, and used for bonding rubber members to each other or a rubber member and a member containing a rubber component.

  FIG. 4 is a front view of the belt-like fabric 14 covered with the rubber cement 24, FIG. 5 is a detailed view of the belt-like fabric 14 of FIG. 4, and FIG. 6 is a cross-sectional view of FIG. The fiber inside the rubber cement coating is impregnated with a dip solution. The woven porosity of the band-like fabric 14 in this state is smaller than that of the band-like cloth 14A in the material state by the amount covered with the rubber cement 24. Further, in FIG. 5, the entire outer surfaces of the fibers constituting the band-shaped cloth 14 are covered with the rubber cement 24, but it is not always necessary that the entire outer surfaces of the fibers are covered with the rubber cement 24. Then, the band-like cloth 14 impregnated with the fiber with the dip liquid and covered with the rubber cement 24 is spirally formed so as to overlap the outer circumference of the inner pipe rubber 12 with a predetermined width as shown in FIG. Wrap and coat. In this winding and covering step, it is desirable to apply a predetermined tension to the belt-like cloth 14. By winding and covering the belt-like fabric 14 while applying tension to the belt-like fabric 14 in this way, it is possible to prevent the belt-like fabric 14 from being loosened or wrinkled.

  In this embodiment, the rubber (intermediate rubber) 18 of the reinforcing layer 20 enters the overlapped band-like fabric 14 and bonds and fixes the band-like fabric 14 and the inner tube rubber 12 or the band-like fabric 14 and the wire 16. The texture porosity of the band-like fabric 14 in a state where the cement 24 is covered is important. The texture void ratio of the fabric is expressed, for example, as a percentage obtained by dividing a gap between adjacent fibers, that is, an opening by a fiber pitch. In this case, for example, it is a percentage obtained by dividing the gap between the adjacent rubber cements 24 by the fiber pitch. For example, if the woven porosity of the band-like fabric 14 covered with the rubber cement 24 is less than 20%, the mesh of the overlapped band-like fabric 14 is too clogged, and the intermediate rubber 18 does not easily enter. On the other hand, if the woven porosity of the band-like fabric 14 in the state covered with the rubber cement 24 exceeds 70%, the wire 16 coated on the outside may bite into the inner tube rubber 12. For this reason, the woven porosity of the band-like fabric 14 in the state covered with the rubber cement 24 is set to 20 to 70%, preferably 30 to 60%.

  In the production of a conventional wire spiral hose, for example, a band-like cloth 14A in a raw material state shown in FIG. 2 is impregnated with a dipping liquid, and the resultant is directly wound around the outer circumference of the inner tube rubber 12 and coated. However, in the material-state band-shaped fabric 14A, particularly, the plain-woven band-shaped cloth 14A, the warp and the weft of the fibers are not stable, and when wound and covered under tension, the fibers themselves are displaced, so-called misalignment. Would. Further, in the band-like fabric 14A in the raw material state, when overlapping and winding and covering as described above, slipping is likely to occur at the overlapping portion, and wrinkles may occur after winding and covering. Furthermore, with the belt-like cloth 14A in the raw material state, when tension is applied, the cloth 14A itself expands, and it is difficult to control the tension during manufacturing. From these facts, the adhesiveness of the intermediate rubber 18 in the overlapping portion of the band-shaped fabric 14A after the winding and covering is inevitably reduced, and there is a possibility that a local difference in adhesive strength may occur. Further, when a work is generated in actual production, the dipping liquid is exposed to oxygen in the air and deteriorates, and as a result, the adhesive strength between the belt-like cloth 14A and the intermediate rubber 18 may decrease.

  On the other hand, in the belt-like fabric 14 of FIG. 4 in which the outer surface of the fiber is covered with the rubber cement 24, the fiber itself is fixed by the rubber cement 24. There is no shift and no misalignment occurs. Further, when the belt-like fabrics 14 are wound and covered so as to overlap each other due to the frictional resistance of the rubber cement coating, slipping hardly occurs at the overlapping portion, and no wrinkles are generated after the winding and covering. Further, since the fibers do not shift due to the rubber cement coating, that is, since the belt-like fabric 14 is hardly stretched, the tension control at the time of manufacturing becomes easy. As a result, the adhesiveness of the overlapping portion of the band-shaped fabric 14 after winding and covering by the intermediate rubber 18 is improved, and a stable adhesive force is achieved. Further, since the fiber impregnated with the dipping liquid is covered with the rubber cement 24, the dipping liquid is not exposed to oxygen in the air, and the deterioration of the dipping liquid is prevented. 12 can be secured.

  Note that at least a part of the fiber must be covered with the rubber cement 24 in order to suppress the displacement of the fiber of the band-shaped cloth 14A in the raw material state and prevent the misalignment. Further, in order that the dipping liquid impregnated in the fibers of the band-like fabric 14 is not easily exposed to oxygen in the air, at least a part of the fibers needs to be covered with the rubber cement 24. That is, in the belt-shaped cloth 14 of this embodiment, at least a part of the fibers constituting the cloth must be covered with the rubber cement 24.

  As described above, in the hose band fabric 14 of this embodiment, when the band fabric 14 is spirally wound around the outer periphery of the inner tube rubber 12 and the wire 16 and the rubber 18 are coated on the outside thereof, Since at least a part of the fibers constituting the band-shaped fabric 14 is covered with the rubber cement 24, even when the band-shaped fabric 14 is spirally wound around the outer circumference of the inner tube rubber 12 and covered, the texture is not easily shifted. Further, when the fibers of the band-shaped fabric 14 are impregnated with the dipping liquid, the dipping liquid is not easily exposed to oxygen in the air, so that the deterioration of the dipping liquid can be suppressed. From these facts, the use of the belt-shaped fabric 14 of this embodiment can improve the workability during hose production.

  In addition, by impregnating the band fabric 14A with a dip solution for improving the adhesiveness to rubber, the rubber cement 24 and the fibers of the band fabric 14A are excellent in adhesion, and the impregnated dip solution has a high oxygen content in the air. Since it is hard to be exposed to water, deterioration of the dipping liquid can be suppressed, and as a result, workability during hose production can be improved.

  In addition, by setting the texture porosity of the band-like cloth 14 in a state covered with the rubber cement 24 to 20 to 70%, the band-like cloth 14 is overlapped with each other in a preset overlapping state so that the band-like cloth 14 Even if the wire 14 is wound and covered, the intermediate rubber 18 covered on the outside can reach the inner tube rubber 12, and the wire 16 can be reliably prevented from biting into the inner tube rubber 12. . From these facts, it is possible to improve the workability at the time of manufacturing the hose. The manner in which the belt-like cloth 14 is wound in a state covered with the rubber cement 24 is also spirally wound, but the manner of winding is not limited to this. For example, it is also possible to wind the sheet so as to wrap it.

  In addition, since the rubber cement 24 is made of NBR rubber, the rubber cement 24 has excellent adhesiveness to the inner rubber, and accordingly, the workability during hose production is excellent.

  Also, by making the fibers of the belt-like fabric 14A plain weave of warp and weft, it is possible to manufacture a long belt-like fabric 14A, but the disadvantage of plain weave that the weave is easily shifted is that the fiber is made of rubber cement 24A. It can be wiped off by coating.

  Further, the outer periphery of the inner tube rubber 12 is spirally wound and covered so that the band-shaped fabric 14 overlaps with a predetermined width, and the outside thereof is covered with the wire 16 and the intermediate rubber 18 in a preset number of laminations. With the hose configuration in which the outermost rubber 22 is coated on the outermost side, wrinkles and slackness are less likely to occur, and the tension control of the belt-like fabric 14 becomes easy, so that workability during hose production is excellent, and The strength of the manufactured hose can be ensured.

  Further, it is preferable that the band-shaped fabric 14 has an angle of 45 to 70 degrees, more preferably 50 to 65 degrees, in comparison with the hose axial direction. If the angle is smaller than 45 degrees, bulges and thread breakage due to crimping occur rarely, and if it is larger than 70 degrees, the fold deviation of the band-shaped fabric rarely occurs.

  As described above, according to the present invention, it is possible to provide a hose band-like fabric that can prevent occurrence of bulges and yarn breakage. Therefore, the hose manufactured using the hose band fabric can maintain the function of the hose for a long period of time even under severe conditions such as a high-temperature fluid flowing inside the hose. . Hereinafter, the present invention will be described with reference to examples, but the scope of the present invention is not limited to the following examples.

<Example 1>
1. Fabrication of a belt-like fabric A polyester fiber (thickness: 560 dtex, Teijin P904B) having a breaking elongation of 28% and a hot water dimensional change rate of 2% as a warp, and a polyester fiber (thickness 560 dtex, Teijin P904B) as a weft is used. ) Was used to produce a band-like fabric. The number of threads was 32 warps / 50 mm and the number of wefts 20 threads / 50 mm, and the number of twists was 20 (z) / 10 cm for both the warp and the weft. The width of the belt-like fabric was 60 mm. The elongation at break was measured in accordance with JIS L1095: 2010, and the dimensional change rate of hot water was measured in accordance with JIS L1013: 2010 under conditions of 100 ° C. hot water × 30 minutes.

2. Production of Hose A hose having the configuration shown in FIG. 1 was produced. That is, each layer was laminated in the order of inner tube rubber / the above-mentioned band-like fabric / intermediate rubber / wire / intermediate rubber / wire / intermediate rubber / wire / intermediate rubber / wire / intermediate rubber / wire / outer rubber to produce a hose. Thereafter, a hose was produced by heating to vulcanize the rubber. The inner tube rubber used was NBR rubber. As the intermediate rubber, a CR rubber was used. The wire used was a steel brass plated product. When laminating the band-shaped cloth, the band-shaped cloth was spirally wound around the inner tube rubber so that the band-shaped cloth was overlapped with a predetermined width. The angle at the time of winding was 60 degrees with respect to the axial direction of the hose.

<Comparative Example 1>
A fabric was prepared in the same manner as in Example 1 except that a polyester fiber (P100Y manufactured by Teijin) having a breaking elongation of 14% and a dimensional change rate of hot water of 6% was used instead of the polyester fiber used in Example 1, Using this, a hose was produced.

<Comparative Example 2>
A fabric was prepared in the same manner as in Example 1 except that nylon fiber having a breaking elongation of 27% and a dimensional change rate of hot water of 13% (Nylon 6 manufactured by Toray Industries Inc.) was used instead of the polyester fiber used in Example 1. Using this, a hose was produced.

<Evaluation>
1. Confirmation of bulge generation Place the above hose in a crimped state in an oven and heat it stepwise from the starting temperature of 80 ° C to the final temperature of 150 ° C in steps of 10 ° C. A bulge is generated every time the temperature rises by 10 ° C. It was visually confirmed whether or not bulging occurred in Example 1, but it was recognized that bulging occurred in Comparative Examples 1 and 2.

2. Confirmation of thread breakage When the hose was dissected when the hose was crimped in the above, it was confirmed by dissecting the hose that no thread break occurred in Example 1 and Comparative Example 2, but the thread break occurred in Comparative Example 1. It was noted that it had occurred.

Claims (9)

A hose band-shaped cloth coated on the outer circumference of the inner tube rubber of the hose and coated with the wire and rubber on the outside,
The warp is formed from a warp and a weft, the elongation at break of the warp according to JIS L1095: 2010 is 20% or more, and the dimensional change rate of hot water according to JIS L1013: 2010 is 5% at 100 ° C. hot water × 30 minutes. % Or less.   The band fabric for a hose according to claim 1, wherein the warp is a polyester fiber.   3. The hose band fabric according to claim 1, wherein the band fabric is impregnated with a dip liquid. 4.   The band fabric for a hose according to any one of claims 1 to 3, wherein at least a part of fibers constituting the band fabric is covered with rubber cement.   The band fabric for a hose according to claim 4, wherein a texture porosity in a state where the rubber cement is coated is 20 to 70%.   The band fabric for a hose according to any one of claims 1 to 5, wherein the warp of the band fabric has a thickness of 235 to 1670 dtex.   The band fabric for a hose according to any one of claims 1 to 6, wherein the number of warps of the band fabric is 20 to 50/50 mm. A hose having the band fabric for a hose according to any one of claims 1 to 7,
The hose band-shaped fabric is spirally wound around the outer circumference of the inner tube rubber so as to overlap with a predetermined width, and the outer side thereof is covered with the wire and the rubber in a preset number of laminations. A hose in which a jacket rubber is coated.   The hose according to claim 8, wherein the angle at which the band-shaped fabric is wound around the outer circumference of the inner tube rubber is 45 to 70 degrees with respect to the axial direction of the hose.

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