JP2016089301A - Method for manufacturing reinforcement yarn for hose and hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a reinforcement yarn for a hose which can ensure the improvement of durability and flexibility of the hose and the easiness of manufacturing of the hose while reducing material cost; and to provide the hose.SOLUTION: In the manufacturing of a reinforcement yarn 6 for a hose composing fiber reinforcement layers 4 and 5 which are interposed between an innermost surface layer 2 and an outermost surface layer 3 of a hose 1 and each have a spiral braided structure, the reinforcement yarn 6 is manufactured by carrying out: an adhesive liquid applying step P1 of twisting a PEN fiber 6a and a PET fiber 6b together to form a twisted yarn 7 having a fineness ratio of the PEN fiber 6a of 50% or more and applying an adhesive liquid W to the twisted yarn 7; a drying step P2 of heating and drying the adhesive liquid W; and a normalizing step P3 of heating the dried adhesive liquid W to promote curing. In the normalizing step P3, tension which prevents a shrinkage of 2% or more from being caused in a yarn longitudinal direction continues to be applied to the twisted yarn 7.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for manufacturing a hose reinforcing yarn and a hose, and more particularly, to a hose reinforcing yarn capable of improving the durability and flexibility of the hose and ensuring the ease of manufacturing the hose while reducing the material cost. The present invention relates to a manufacturing method and a hose.

  A fiber reinforcing layer is embedded in the hose to meet various uses (durability, flexibility, cutting strength, etc.) required for the application and the hose. For example, in a refrigerant high-pressure hose, a hose is proposed in which a two-layer spiral braided fiber reinforcement layer is interposed between an inner rubber layer and an outer rubber layer (see Patent Document 1). In the hose proposed in Patent Document 1, various materials are presented as reinforcing yarns constituting the fiber reinforcing layer.

  In Patent Document 1, PET (polyethylene terephthalate) fiber is recommended as a material of the reinforcing yarn from the viewpoint of cost (see paragraph 0020). If the viewpoint of cost is ignored, it is desirable to use PEN (polyethylene-2,6-naphthalate) fiber in order to improve various performances required for the hose. However, the PEN fiber has a remarkably small distribution amount compared to the PET fiber, and the cost is very high. For this reason, it has not been practical to use PEN fibers as reinforcing yarns for hoses.

JP 2006-307987 A

  The objective of this invention is providing the manufacturing method and hose of the reinforcement thread | yarn for hose which can ensure the durability of a hose, the improvement of a flexibility, and the ease of manufacture of a hose, reducing material cost.

  In order to achieve the above object, a method for producing a reinforcing thread for a hose according to the present invention includes a reinforcing thread for a hose constituting a fiber reinforcing layer having a spiral braid structure interposed between an outermost surface layer and an outermost surface layer of the hose. In the manufacturing method, a PEN fiber and a PET fiber are twisted together to form a twisted yarn having a fineness ratio of PEN fiber of 50% or more, and an adhesive solution applying step for applying an adhesive solution to the twisted yarn, and heating the adhesive solution A drying process for drying and a normalizing process for heating the dried adhesive liquid to promote curing produce a reinforcing yarn. In this normalizing process, the twisted yarn is contracted by 2% or more in the longitudinal direction. It is characterized by continuing to apply a tension that does not cause the.

  The hose of the present invention has two or more fiber braided layers of spiral braided structure composed of reinforcing yarns manufactured by the method for manufacturing reinforcing yarns for hoses described above, between the innermost surface layer and the outermost surface layer. It is characterized by being interposed.

  According to the method for manufacturing a reinforcing yarn for hose of the present invention, the reinforcing yarn is formed by twisting PEN fiber and PET fiber, so that the material cost is lower than that of the reinforcing yarn formed only of PEN fiber. Can be reduced. On the other hand, the fineness ratio of the PEN fiber in the reinforcing yarn is set to 50% or more, and in the normalizing process, the twisted yarn formed by twisting the PEN fiber and the PET fiber is not contracted by 2% or more in the yarn longitudinal direction. By continuing to apply the tension, the properties of the PET fiber can be brought close to those of the PEN fiber. That is, the cutting strength is improved and the intermediate elongation and the dry heat shrinkage rate are easily set in appropriate ranges as compared with the reinforcing yarn formed only of the PET fiber. Therefore, forming a fiber reinforcing layer having a spiral braided structure of the hose with this reinforcing yarn is advantageous in improving the durability and flexibility of the hose and ensuring the ease of manufacturing the hose.

  In the method for manufacturing a reinforcing thread for a hose of the present invention, for example, the PEN fiber and the PET fiber have the same thickness. Thereby, since it becomes easy to balance each fiber from which a characteristic differs, the performance of a reinforcement yarn is stabilized.

  The intermediate elongation of the reinforcing yarn at 1.2 cN / dtex at 135 ° C. is, for example, 0.4% or more and 5.0% or less. Thereby, it becomes easier to improve the performance of the hose.

  In the hose of the present invention, for example, an intermediate rubber layer is not interposed between the fiber reinforcement layers, and the hose is in direct contact with each other. Thereby, the material cost of the hose can be reduced, and the hose can be reduced in weight and bendable.

It is explanatory drawing which illustrates an internal structure by notching a part of hose of this invention. It is explanatory drawing which expands and illustrates a reinforcement thread | yarn. It is explanatory drawing which illustrates the adhesion | attachment process process of a reinforcement thread | yarn.

  Hereinafter, the manufacturing method and hose of the reinforcement thread | yarn for hose of this invention are demonstrated based on embodiment shown in the figure.

  In the hose 1 of the present invention illustrated in FIG. 1, an inner fiber reinforcement layer 4 and an outer fiber reinforcement layer 5 having a spiral braid structure are interposed between an innermost surface layer 2 and an outermost surface layer 3. The material of the innermost layer 2 is determined by the type of fluid that the hose 1 circulates.

  Examples of the material of the innermost surface layer 2 include butyl rubber (IIR), chlorinated butyl rubber (Cl-IIR), brominated butyl rubber (Br-IIR), brominated isobutylene-co-para-methylstyrene (BIMS), and acrylonitrile-butadiene. Examples thereof include rubber (NBR), hydrogenated acrylonitrile-butadiene rubber (HNBR), acrylonitrile-butadiene-isoprene rubber (NBIR), acrylonitrile-isoprene rubber (NIR), etc. May be used.

  Among these materials, the optimum rubber material varies depending on the application. For example, in the case of a refrigerant transport hose, from the viewpoint of refrigerant permeation resistance, butyl rubber (IIR), chlorinated butyl rubber (Cl-IIR), brominated butyl rubber (Br-IIR), brominated isobutylene-co-para-methylstyrene (BIMS) is preferably used.

  The innermost surface layer 2 may be formed of rubber alone, but may be formed of a rubber composition containing various additives depending on the use of the hose 1 or the performance required for the hose 1. Good. Examples of the additive include a vulcanizing agent, a vulcanization accelerator, a filler, a reinforcing agent, a plasticizer, an antiaging agent, a softening agent, a tackifier, a lubricant, a dispersing agent, and a processing aid. .

  The layer thickness of the innermost surface layer 2 can be set to any layer thickness depending on the use of the hose 1, the performance required for the hose 1, etc., and is, for example, about 0.5 mm to 4.0 mm.

  Examples of the material of the outermost surface layer 3 include styrene-butadiene rubber (SBR), chloroprene rubber (CR), butyl rubber (IIR), chlorinated butyl rubber (Cl-IIR), brominated butyl rubber (Br-IIR), and ethylene-propylene. -Diene rubber (EPDM), chlorosulfonated polyethylene rubber (CSM), etc. are mentioned, It may be used individually by 1 type or may be used in mixture of 2 or more types.

  Among these materials, it is preferable to use ethylene-propylene-diene rubber (EPDM) because it is excellent in weather resistance, heat resistance, and moisture permeability resistance.

  Although the outermost surface layer 3 may be formed of rubber alone, it may be formed of a rubber composition containing various additives depending on the use of the hose 1, the performance required for the hose 1, and the like. Good. As this additive, the various additives illustrated above as a rubber composition which forms the innermost surface layer 2 are mentioned.

  The layer thickness of the outermost surface layer 3 can be any layer thickness depending on the application of the hose 1, the performance required for the hose 1, etc., but is about 0.5 mm to 3.0 mm.

  Reinforcing yarns 6 constituting the inner fiber reinforcing layer 4 and the outer fiber reinforcing layer 5 are arranged so as to be inclined at a predetermined braiding angle with respect to the tube axis direction of the hose 1. In the inner fiber reinforcement layer 4 and the outer fiber reinforcement layer 5 that are stacked and adjacent to each other, the braiding angles of the respective reinforcing yarns 6 are symmetric with respect to the tube axis direction of the hose 1.

  In this embodiment, the inner fiber reinforcement layer 4 and the outer fiber reinforcement layer 5 are in direct contact with each other, and no intermediate rubber layer is interposed between them, but an intermediate rubber layer can also be interposed. . If the intermediate rubber layer is omitted, the material cost of the hose 1 can be reduced, and the weight of the hose 1 can be reduced and the flexibility can be improved. In this embodiment, two fiber reinforcement layers of the inner fiber reinforcement layer 4 and the outer fiber reinforcement layer 5 are provided. However, depending on the performance required for the hose 1, etc., it may be three or more layers.

  The reinforcing yarn 6 is manufactured by the manufacturing method of the present invention described later. As illustrated in FIG. 2, the reinforcing yarn 6 is formed by twisting together PEN fibers (filament yarns) 6a and PET fibers (filament yarns) 6b. The fineness ratio of the PEN fibers 6a in the reinforcing yarn 6 is 50% or more.

  In this embodiment, two PEN fibers 6a and one PET fiber 6b are twisted together, but the number of filament yarns to be twisted can be four or more, for example, three The reinforcing yarn 6 is formed by twisting ~ 6 filament yarns. Either single twist or various twists can be employed. The upper limit of the fineness ratio of the PEN fibers 6a in the reinforcing yarn 6 is, for example, 80%.

  The thickness of the PEN fiber 6a and the PET fiber 6b is, for example, about 500 dtex to 3500 dtex. The PEN fiber 6a and the PET fiber 6b can have different thicknesses. However, if the same thickness is used, the fibers having different characteristics can be easily balanced, so that the performance of the reinforcing yarn 6 is stabilized.

  In addition to the above-mentioned innermost surface layer 2, outermost surface layer 3, and fiber reinforcing layers 4, 5, the hose 1 can be appropriately provided with, for example, the following resin layers.

  Examples of the resin material for forming the resin layer include polyamide resins, polyethylene resins, polypropylene resins, polyester resins, fluorine resins, vinyl chloride resins, polyether resins, polymethacrylate resins, and polyvinyl resins. May be used alone or in combination of two or more.

  Among these materials, the optimum resin material varies depending on the use of the hose 1. For example, in the case of an automotive air conditioner hose, it is preferable to use a polyamide-based resin because it is particularly excellent in resistance to refrigerant permeation. It is more preferable to use a mixed resin (blend) of nylon 6 (N6) and nylon 11 (N11).

  Hereafter, the procedure of the manufacturing method of the reinforcement thread | yarn for hose of this invention is demonstrated.

  First, the PEN fiber 6a and the PET fiber 6b are twisted together to form a twisted yarn 7 in which the fineness ratio of the PEN fiber 6a is 50% or more. Next, the twisted yarn 7 is wound around a drum 8a illustrated in FIG.

  Subsequently, the twisted yarn 7 is unwound from the drum 8a, and the reinforcing yarn 6 is manufactured through an adhesion treatment process in which an adhesive liquid application process P1, a drying process P2, and a normalizing process P3 are sequentially performed. Wind up to 8b. In each of the processes P1, P2, and P3, a predetermined tension can be independently applied to the twisted yarn 7 in the yarn longitudinal direction.

  In the adhesive liquid application process P <b> 1, the adhesive liquid W is applied to the twisted yarn 7. For example, the twisted yarn 7 is immersed in a storage tank in which the adhesive liquid W is stored, and the adhesive liquid W is applied. The adhesive liquid W can be applied to the twisted yarn 7 by an appropriate application means. As the adhesive liquid W, for example, an RFL (resorcin / formalin / latex) -based adhesive liquid is used. According to this adhesive liquid, the adhesion between the reinforcing yarn 6 using the PEN fiber 6a and the rubber is further improved.

In the drying step P2, the applied adhesive liquid W is heated and dried. The heating temperature is, for example, 100 ° C. to 170 ° C., and the required time is, for example, 20 seconds to 300 seconds.

In the normalizing process P3, the dried adhesive liquid W is heated to promote curing. The heating temperature is, for example, 180 ° C. to 250 ° C., and the required time is, for example, 20 seconds to 600 seconds.

  In the normalizing process P3, the twisted yarn 7 is continuously loaded with a tension that does not cause a shrinkage of 2% or more in the yarn longitudinal direction. If no tension is applied to the twisted yarn 7 in the longitudinal direction, the heat shrinks freely and the amount of shrinkage becomes excessive. Therefore, the tension applied in the longitudinal direction of the yarn is controlled so that the twisted yarn 7 does not shrink by 2% or more in the longitudinal direction of the yarn. For example, the tension is continuously applied so that the elongation in the longitudinal direction of the twisted yarn 7 is in the range of minus 2% to plus 1%. An elongation of minus 2% means a 2% contraction.

  For the PEN fiber 6a, the tension condition in the normalizing step P3 does not greatly affect the characteristics. On the other hand, for the PET fiber 6b, the tension condition in the normalizing step P3 greatly affects the characteristics. In order for the reinforcing yarn 6 in which the PEN fiber 6a and the PET fiber 6b are twisted together to exhibit the same performance as the reinforcing yarn made of only the PEN fiber 6a, the tension condition of the normalizing step P3 is extremely important.

  The inventor of the present invention has found the above-described appropriate tension condition in the normalizing step P3, and has made it possible to exhibit the performance of the reinforcing yarn 6 equivalent to that of the reinforcing yarn consisting only of the PEN fibers 6a. In other words, even if the reinforcing yarn 6 is formed by twisting the PEN fiber 6a and the PET fiber 6b, sufficient performance cannot be obtained unless the tension conditions in the normalizing step P3 are appropriate.

  According to the reinforcing yarn 6 manufactured according to the present invention, the cutting strength is improved and the intermediate elongation and the dry heat shrinkage rate are easily set in appropriate ranges as compared with the reinforcing yarn formed only of the PET fiber 6b. That is, it is possible to ensure performance that approximates a reinforcing yarn formed only from the PEN fibers 6a. Therefore, it is advantageous to ensure the durability and flexibility of the hose 1 and the ease of manufacturing the hose by forming the fiber reinforcing layers 4 and 5 of the spiral braid structure of the hose 1 with the reinforcing yarn 6. become.

  Further, since the reinforcing yarn 6 is formed by twisting the PEN fiber 6a and the PET fiber 6b, the material cost can be reduced as compared with the reinforcing yarn formed only by the PEN fiber 6a. In addition, unless the fineness ratio of the PEN fiber 6a in the reinforcing yarn 6 is 50% or more, the cutting strength cannot be sufficiently improved, and it becomes difficult to set the intermediate elongation and the dry heat shrinkage to appropriate ranges. .

  The intermediate elongation at 1.2 cN / dtex at 135 ° C. of the reinforcing yarn 6 is, for example, 0.4% or more and 5.0% or less. Thereby, the flexibility and ease of manufacture of the hose 1 are further improved.

  Seven types of reinforcing yarns (Conventional Examples 1 and 2, Comparative Examples 1 and 2, and Examples 1 to 3) were manufactured by twisting three 1100 dtex filament yarns as illustrated in Table 1. The filament yarn was S-twisted and the number of twists was 10 per 10 cm length. Conventional Example 1 was formed with three filament yarns made of PET fibers. Conventional Example 2 was formed by three filament yarns made of PEN fibers. Comparative Example 1 was formed with two filament yarns made of PET fibers and one filament yarn made of PEN fibers. Comparative Example 2 and Examples 1 to 3 were formed of one filament yarn made of PET fiber and two filament yarns made of PEN fiber. Each reinforcing yarn was subjected to an adhesion treatment using an RFL adhesive solution, and the tension was controlled and applied so that the elongation in the normalizing process became the elongation shown in Table 1. Negative elongation in the table means shrinkage.

  For each reinforcing yarn, the cutting strength, intermediate elongation, and dry heat shrinkage were measured, and the results are shown in Table 1. Moreover, material cost was evaluated and it shows in Table 1 collectively. The higher the value of the cutting strength, the better the durability of the hose. The cutting strength is preferably 205 N or more. The intermediate elongation and dry heat shrinkage ratio are better as the numerical value is smaller, and the ease of manufacturing the hose is improved. The intermediate elongation is preferably 0.4% to 5.0% from the viewpoint of the flexibility of the hose. A preferable range of the dry heat shrinkage is 1.5% to 6.0%. Evaluation of material cost shows that ◎ is inexpensive and very preferable, ◯ is reasonable and preferable, and × is expensive and not preferable.

  From the results in Table 1, it can be seen that in Examples 1 to 3, the cutting strength, intermediate elongation, and dry heat shrinkage ratio are in appropriate ranges while suppressing the material cost.

DESCRIPTION OF SYMBOLS 1 Hose 2 Innermost surface layer 3 Outermost surface layer 4 Inner fiber reinforcement layer 5 Outer fiber reinforcement layer 6 Reinforcement thread 6a PEN fiber (filament thread)
6b PET fiber (filament yarn)
7 Twisted yarn 8a, 8b Drum P1 Adhesive liquid application process P2 Dry process P3 Normalizing process W Adhesive liquid

Claims (5)

In the manufacturing method of the reinforcing yarn for the hose constituting the fiber reinforcing layer of the spiral braid structure interposed between the outermost surface layer and the outermost surface layer of the hose,
PEN fiber and PET fiber are twisted together to form a twisted yarn having a fineness ratio of PEN fiber of 50% or more, and an adhesive solution applying step for applying an adhesive solution to the twisted yarn, and a drying step for heating and drying the adhesive solution And a normalizing step for heating the dried adhesive liquid to promote hardening to produce a reinforcing yarn, and in this normalizing step, the tension that does not cause shrinkage of 2% or more in the yarn longitudinal direction in the twisted yarn A method for producing a reinforcing thread for a hose, characterized by continuing to load.   The method for producing a reinforcing thread for a hose according to claim 1, wherein the PEN fiber and the PET fiber have the same thickness.   The method for producing a reinforcing yarn for a hose according to claim 1 or 2, wherein an intermediate elongation of the reinforcing yarn at 135 ° C at 1.2 cN / dtex is 0.4% or more and 5.0% or less.   The fiber reinforcing layer of the spiral braid structure comprised with the said reinforcing yarn manufactured by the manufacturing method of the reinforcing yarn for hoses in any one of Claims 1-3, and the outermost surface layer and outermost surface layer A hose interposed between them.   The hose according to claim 4, wherein the intermediate rubber layer is not interposed between the fiber reinforced layers and is in direct contact with each other.

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