US20010023714A1 - Fluid-impermeable composite hose - Google Patents
Fluid-impermeable composite hose Download PDFInfo
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- US20010023714A1 US20010023714A1 US09/810,569 US81056901A US2001023714A1 US 20010023714 A1 US20010023714 A1 US 20010023714A1 US 81056901 A US81056901 A US 81056901A US 2001023714 A1 US2001023714 A1 US 2001023714A1
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- hose
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L11/12—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L2011/047—Hoses, i.e. flexible pipes made of rubber or flexible plastics with a diffusion barrier layer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S138/00—Pipes and tubular conduits
- Y10S138/10—Metal foil
Definitions
- This invention relates to a fluid-impermeable composite hose. More particularly, it relates to a fluid-impermeable composite hose having a fluid-impermeable layer formed by sandwiching between two thin resin layers a laminated layer containing a metallic foil, or a metallic layer formed by vapor deposition.
- the hose of this invention is particularly suitable for use on a motor vehicle as a hose for transporting a refrigerant, such as carbon dioxide, or as a fuel hose.
- every hose used for transporting a refrigerant, such as carbon dioxide, in an air-conditioning system on a motor vehicle be impermeable to the refrigerant.
- a refrigerant such as carbon dioxide
- One of the most effective approaches lies in a hose having a laminated wall layer which contains a metallic foil, or a metallic layer formed by vapor deposition.
- Environmental protection also requires a fuel hose to be impermeable to fuel, and a laminated wall layer is very useful for a fuel hose, too.
- the laminated layer employed as described is, however, not thoroughly secured or reinforced in the wall of the hose. Therefore, it is directly affected by any bending, deforming or stretching force acting upon the wall of the hose as a result of e.g. an elevation in pressure of the refrigerant in the hose, the vibration of the vehicle, or any impact bearing upon it.
- the metallic foil or layer in the laminated layer is easily broken and the hose loses its fluid impermeability.
- a hose having a wall comprising a fluid-impermeable layer of a sandwiched structure in which a laminated layer is held between two thin resin layers, the laminated layer containing a metallic foil, or a metallic layer formed by vapor deposition.
- the laminated layer is secured and protected by the two thin resin layers located radially inwardly and outwardly thereof.
- the bending, deforming or stretching force acting upon the hose for various reasons is absorbed or diminished by those resin layers, and is not directly transmitted to the laminated layer. No force acts upon the metallic foil or layer in the laminated layer to twist, bend, stretch or otherwise deform it.
- the metallic foil or layer is not easily broken, and the hose does not lose its fluid impermeability.
- the fluid-impermeable layer forms the innermost layer of the wall of the hose.
- the thin resin layer on the inside of the fluid-impermeable layer is superior to any rubber layer in refrigerant impermeability. Unlike a rubber layer, it does not deteriorate by swelling or foaming even when carbon dioxide as a refrigerant is in its supercritical state at a high temperature and a high pressure.
- the hose is particularly suitable as a hose for transporting carbon dioxide as a refrigerant for e.g. an air conditioner on a motor vehicle.
- the wall has a rubber layer inwardly of the fluid-impermeable layer.
- a rubber layer inwardly of the fluid-impermeable layer.
- Such a layer can be of a material having a high resistance to swelling with fuel and a high impermeability to fuel, such as fluororubber (FKM) or acrylonitrile-butadiene rubber (NBR), so that the hose may be suitable as a fuel hose.
- FKM fluororubber
- NBR acrylonitrile-butadiene rubber
- the wall has a reinforcing layer and an outer rubber layer outwardly of the fluid-impermeable layer.
- the reinforcing layer gives pressure resistance and strength to the hose.
- the outer rubber layer gives ozone resistance to the hose, protects it from any external impact, and improves the tightness of a seal in a joint between the hose and a pipe.
- the wall has an intermediate rubber layer interposed between the fluid-impermeable layer and the reinforcing layer.
- the intermediate rubber layer gives an improved adhesion between the fluid-impermeable layer and the reinforcing layer, diminishes any bending, deforming or stretching force acting upon the fluid-impermeable layer, and improves the flexibility of the hose as a whole.
- the laminated layer is formed by spirally winding or longitudinally lapping a tape of a laminated sheet containing one of the following (1) to (3) and a resin film or films laminated thereon:
- the resin film protects the metallic foil or layer when the hose is bent, deformed or stretched.
- the metallic foil or layer is not easily damaged or broken by fatigue, and the hose maintains its high fluid impermeability for a long time. Spiral winding or longitudinal lapping makes it very easy to form the laminated layer on a tubular hose body. If the laminated sheet contains a metallic foil and a reinforcing material, its stretch resistance makes it possible to avoid the breakage of the foil even if the hose may be stretched or bent by a force which is too strong to be resisted by the resin film (or films) alone.
- At least one of the thin resin layers on the inside and outside of the fluid-impermeable layer is of an ethylene-vinyl alcohol copolymer resin (EVOH), a blend of a polyamide and a modified polyolefin resin, a polyamide resin, or a fluororesin. All of these resins are high in fluid impermeability for refrigerant or fuel and in flexibility, so that the hose has a still higher fluid impermeability, and is flexible enough to withstand the vibration of a motor vehicle, or its engine.
- EVOH ethylene-vinyl alcohol copolymer resin
- All of these resins are high in fluid impermeability for refrigerant or fuel and in flexibility, so that the hose has a still higher fluid impermeability, and is flexible enough to withstand the vibration of a motor vehicle, or its engine.
- At least one of the thin resin layers on the inside and outside of the fluid-impermeable layer has a thickness of 20 to 300 ⁇ m. This is a preferred range in which the resin layers can perform its protective action effectively and thus ensure the fluid impermeability without affecting the flexibility of the hose in any way.
- FIG. 1 is a partly cutaway perspective view of a hose embodying this invention
- FIG. 2 is a view similar to FIG. 1, but showing a different embodiment
- FIG. 3A is fragmentary perspective view of a laminated sheet embodying this invention.
- FIG. 3B is a cross sectional view thereof.
- FIG. 3C is a view similar to FIG. 3B, but showing a modified form of a laminated sheet.
- the fluid-impermeable composite hose of this invention can be used for transporting various kinds of fluids. Its preferred use is, however, for transporting a refrigerant, or fuel, particularly in a motor vehicle.
- the fluid-impermeable composite hose according to the second aspect is preferred, and the fluid-impermeable composite hose according to the third aspect is preferred as the fuel hose.
- the hose of this invention comprises in its wall a fluid-impermeable layer formed by sandwiching a laminated layer containing a metallic foil or a metallic layer formed by vapor deposition, between two thin resin layers. It may or may not have another layer or layers.
- the laminated layer may be employed in any position relative to the remaining layer or layers and may, for example, be employed as an inner or intermediate layer.
- the fluid-impermeable layer may form the innermost layer of the wall, or may be lined with a rubber layer.
- the latter may be of any rubber, but is preferably of e.g. FKM or NBR if the hose is a fuel hose.
- the fluid-impermeable layer may be surrounded by another layer, or layers.
- it may be surrounded by a reinforcing layer and an outer rubber layer, and an intermediate rubber layer may be interposed between the fluid-impermeable layer and the reinforcing layer.
- the laminated layer and the inner and outer thin resin layers which form the fluid-impermeable layer are preferably bonded to one another. However, they may not be bonded.
- a usually appropriate process for making the fluid-impermeable layer may include forming the inner resin layer by extrusion, forming the laminated layer about it and forming the outer resin layer by extrusion, though other appropriate processes may be used.
- the laminated layer may be of any construction if it is a laminate containing a metallic foil or a metallic layer formed by vapor deposition. However, it is preferably composed of (1) a metallic foil, (2) a metallic foil with a reinforcing material, or (3) a metallic layer formed by vapor deposition; and a resin film or films laminated thereon.
- the laminated layer is preferably formed by spirally winding or longitudinally lapping a tape of a laminated sheet composed of one of the (1) to (3) above, and a resin film or films.
- Spiral winding is a method in which a tape of a laminated sheet is wound spirally to form a cylindrical layer having no gap between any two adjoining turns.
- Longitudinal lapping is a method in which a tape of a laminated sheet having a width large enough to encircle a hose to be made is placed in parallel to the longitudinal axis of the hose and bent into a cylindrical layer having no gap between two longitudinal edges thereof.
- the laminated sheet is usually made by placing the metallic foil or the metallic layer between two resin films and bonding the films to each other with an adhesive, or welding them to each other.
- a laminated sheet containing a metallic layer formed by vapor deposition may be made by forming such a layer on one side of a resin film and welding or otherwise bonding another resin film to that side.
- a laminated sheet may also be made by forming a metallic layer by vapor deposition on each of two resin films and welding or otherwise bonding the films to each other in such a way that the metallic layers may join each other.
- the reinforcing material is preferably bonded to the foil to produce a higher reinforcing effect.
- the reinforcing material is preferably situated radially outwardly of the foil.
- the foil and reinforcing material may or may not be bonded to the resin films. While any kind of reinforcing material may be used, preferred examples are a wire mesh and a reinforcing cloth because of their high stretch resistance and flexibility. Examples of the reinforcing cloths include a canvas and a nonwoven fabric, preferably made from aramid, carbon, glass or like fibers of low stretchability. A resin film of high strength can also be used as the reinforcing material.
- the resin films may be of any appropriate resin, such as a polyamide resin, a polyethylene-terephthalate resin or EVOH.
- Each film preferably has a thickness of, say, 5 to 100 ⁇ m. If its thickness is too large, the laminated sheet is difficult to apply by spiral winding or longitudinal lapping.
- the laminated sheet spirally wound or longitudinally lapped preferably has a pair of spirally or longitudinally extending edge portions overlapping each other to ensure high fluid impermeability. Its overlapping edge portions are preferably bonded to each other to ensure a still higher degree of fluid impermeability.
- any resinous material may be used for the thin resin layers between which the laminated layer is held to form the fluid-impermeable layer, since the resinous materials are generally more impermeable to a refrigerant or fuel than rubbers are. Moreover, the resinous materials are much less liable to deteriorate by swelling or foaming with carbon dioxide in its supercritical state.
- Preferred resinous materials include EVOH and a polyamide resin.
- Other preferred examples include a modified polyolefin resin obtained by graft polymerization of an unsaturated carboxylic acid or a derivative thereof to a polyolefin consisting basically of e.g. ethylene or propylene, and a mixture of any such modified polyolefin resin and a polyamide resin.
- EVOH is, among others, preferred, since it enables the fluid-impermeable layer to resist any undesirably large drop in fluid impermeability even if the metallic foil or layer may have been damaged or broken.
- Examples of the preferred polyamide resins include nylon 6, nylon 66, nylon 11, nylon 12, or a copolymer thereof, and a polyamide resin having an aromatic, such as m-xylenediamine, in its principal chain.
- Other preferred resinous materials include polyethylene or polybutylene terephthalate, and polyethylene or polybutylene naphthalate.
- the resin layers can be formed by any known method, such as extrusion molding. They preferably have a thickness not exceeding 300 ⁇ m each, or not exceeding 500 ⁇ m in total, to ensure the flexibility of the hose. An extremely small layer thickness in the order of, say, less than 20 ⁇ m should, however, be avoided to ensure fluid impermeability and the formation of a resin layer of uniform thickness not having any opening therein.
- the resin layers are preferably bonded to the laminated layer by, for example, using an adhesive, or welding.
- An intermediate rubber layer may be interposed between the fluid-impermeable layer and a reinforcing layer surrounding it, if any, to ensure improved adhesion, protection and flexibility, as stated before.
- the intermediate rubber layer gives effects as mentioned above with respect to the fifth aspect of the invention. It is preferably of, for example, butyl rubber (IIR), halogenated butyl rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber (EPDM), or nitrile rubber (NBR). These rubbers are high in fluid impermeability and flexibility, and easily achieve a good adhesion to the fluid-impermeable and reinforcing layers at a high temperature.
- the intermediate rubber layer preferably has a thickness of, say, 0.2 to 1.5 mm.
- the hose preferably has a reinforcing layer in its wall.
- the reinforcing layer may, for example, be a braided wire layer or a layer formed by braiding reinforcing yarn, or winding reinforcing yarn in two spiral layers extending in the opposite directions, or placing an intermediate rubber layer between two such spiral layers.
- An outer rubber layer may form the outermost wall layer of the hose. It is preferably of any rubber of high weatherability, such as chloroprene rubber (CR), IIR, chlorosulfonated polyethylene rubber (CSM), or EPDM.
- CR chloroprene rubber
- IIR chloroprene rubber
- CSM chlorosulfonated polyethylene rubber
- EPDM EPDM
- a fluid-impermeable composite hose 1 sequentially comprises a fluid-impermeable layer 2 as the innermost layer of its wall, an intermediate rubber layer 7 formed from IIR, a reinforcing layer 8 formed by braiding an appropriate kind of reinforcing yarn, and an outer rubber layer 9 formed from IIR.
- the fluid-impermeable layer 2 is composed of an inner thin resin layer 3 formed by extrusion from EVOH and having a thickness of 150 ⁇ m, a laminated layer 5 formed by winding a tape of a laminated sheet 4 spirally, and an outer thin resin layer 6 formed by extrusion from EVOH and having a thickness of 150 ⁇ m.
- the outer thin resin layer 6 and the intermediate rubber layer 7 are appropriately bonded to each other by vulcanization, and so are the intermediate rubber layer 7 and the reinforcing layer 8 .
- the laminated sheet 4 has a pair of spirally extending edge portions overlapping each other and bonded to each other.
- FIG. 2 shows a hose 10 according to another embodiment of this invention.
- Its fluid-impermeable layer is composed of an inner thin resin layer 3 formed from a polyamide resin, a laminated layer 5 formed by longitudinally lapping a tape of a laminated sheet 4 and having a pair of longitudinally extending edge portions overlapping each other and bonded to each other, and an outer thin resin layer 6 formed from a polyamide resin.
- the hose 10 is identical to the hose 1 shown in FIG. 1.
- the laminated sheet 4 used in the hoses shown in FIGS. 1 and 2 are shown in detail in FIGS. 3A and 3B. It includes an aluminum foil 4 c as a metallic foil and a resin sheet as a reinforcing material 4 d which are sandwiched between an inner resin layer 4 a in the form of a thin film of a thermoplastic PET resin and a similar outer resin layer 4 b , and bonded thereto.
- the metallic foil 4 c is bonded to the reinforcing material 4 d with an adhesive not shown, and is thereby so bound as not to be affected at all by any tensile or like force acting upon the laminated sheet 4 .
- FIG. 3C shows a modified form of laminated sheet 4 . It does not have any reinforcing material as shown at 4 d in FIG. 3B., but has only a metallic foil 4 c held between its inner and outer resin layers 4 a and 4 b.
Abstract
A fluid-impermeable composite hose has a laminated layer having a high impermeability to a refrigerant, etc. and held between two resin layers having a thickness which is small enough to enable the hose to remain flexible. The resin layers secure and protect the laminated layer and protect a metallic foil in the laminated layer from any bending, deforming or stretching force acting upon the hose.
Description
- 1. Field of the Invention
- This invention relates to a fluid-impermeable composite hose. More particularly, it relates to a fluid-impermeable composite hose having a fluid-impermeable layer formed by sandwiching between two thin resin layers a laminated layer containing a metallic foil, or a metallic layer formed by vapor deposition. The hose of this invention is particularly suitable for use on a motor vehicle as a hose for transporting a refrigerant, such as carbon dioxide, or as a fuel hose.
- 2. Description of the Related Art
- It is strongly desired in view of system maintenance, environmental protection, etc. that every hose used for transporting a refrigerant, such as carbon dioxide, in an air-conditioning system on a motor vehicle be impermeable to the refrigerant. One of the most effective approaches lies in a hose having a laminated wall layer which contains a metallic foil, or a metallic layer formed by vapor deposition. Environmental protection also requires a fuel hose to be impermeable to fuel, and a laminated wall layer is very useful for a fuel hose, too.
- When making a hose having such a laminated layer in its wall, it has hitherto been usual to form, for example, a rubber layer having high refrigerant or fuel resistance and impermeability inwardly of such a laminated layer. For making a hose required to withstand a high pressure, it has been usual to surround such a laminated layer by an intermediate rubber layer, etc., then by a reinforcing yarn layer and finally by an outer rubber layer.
- The laminated layer employed as described is, however, not thoroughly secured or reinforced in the wall of the hose. Therefore, it is directly affected by any bending, deforming or stretching force acting upon the wall of the hose as a result of e.g. an elevation in pressure of the refrigerant in the hose, the vibration of the vehicle, or any impact bearing upon it. Thus, the metallic foil or layer in the laminated layer is easily broken and the hose loses its fluid impermeability.
- It is, therefore, an object of this invention to prevent effectively any breakage of a metallic foil or layer in a laminated layer of a fluid-impermeable composite hose. The inventors of this invention have thought that it is very effective to sandwich a laminated layer between two thin resin layers, and that the hose is flexible enough if those resin layers are adequate.
- According to a first aspect of this invention, there is provided a hose having a wall comprising a fluid-impermeable layer of a sandwiched structure in which a laminated layer is held between two thin resin layers, the laminated layer containing a metallic foil, or a metallic layer formed by vapor deposition. The laminated layer is secured and protected by the two thin resin layers located radially inwardly and outwardly thereof. The bending, deforming or stretching force acting upon the hose for various reasons is absorbed or diminished by those resin layers, and is not directly transmitted to the laminated layer. No force acts upon the metallic foil or layer in the laminated layer to twist, bend, stretch or otherwise deform it. Thus, the metallic foil or layer is not easily broken, and the hose does not lose its fluid impermeability.
- According to a second aspect of this invention, the fluid-impermeable layer forms the innermost layer of the wall of the hose. The thin resin layer on the inside of the fluid-impermeable layer is superior to any rubber layer in refrigerant impermeability. Unlike a rubber layer, it does not deteriorate by swelling or foaming even when carbon dioxide as a refrigerant is in its supercritical state at a high temperature and a high pressure. Thus, the hose is particularly suitable as a hose for transporting carbon dioxide as a refrigerant for e.g. an air conditioner on a motor vehicle.
- According to a third aspect of this invention, the wall has a rubber layer inwardly of the fluid-impermeable layer. Such a layer can be of a material having a high resistance to swelling with fuel and a high impermeability to fuel, such as fluororubber (FKM) or acrylonitrile-butadiene rubber (NBR), so that the hose may be suitable as a fuel hose.
- According to a fourth aspect of this invention, the wall has a reinforcing layer and an outer rubber layer outwardly of the fluid-impermeable layer. The reinforcing layer gives pressure resistance and strength to the hose. The outer rubber layer gives ozone resistance to the hose, protects it from any external impact, and improves the tightness of a seal in a joint between the hose and a pipe.
- According to a fifth aspect of this invention, the wall has an intermediate rubber layer interposed between the fluid-impermeable layer and the reinforcing layer. The intermediate rubber layer gives an improved adhesion between the fluid-impermeable layer and the reinforcing layer, diminishes any bending, deforming or stretching force acting upon the fluid-impermeable layer, and improves the flexibility of the hose as a whole.
- According to a sixth aspect of this invention, the laminated layer is formed by spirally winding or longitudinally lapping a tape of a laminated sheet containing one of the following (1) to (3) and a resin film or films laminated thereon:
- (1) a metallic foil;
- (2) a metallic foil and a reinforcing material; and
- (3) a metallic layer formed by vapor deposition.
- The resin film (or films) protects the metallic foil or layer when the hose is bent, deformed or stretched. The metallic foil or layer is not easily damaged or broken by fatigue, and the hose maintains its high fluid impermeability for a long time. Spiral winding or longitudinal lapping makes it very easy to form the laminated layer on a tubular hose body. If the laminated sheet contains a metallic foil and a reinforcing material, its stretch resistance makes it possible to avoid the breakage of the foil even if the hose may be stretched or bent by a force which is too strong to be resisted by the resin film (or films) alone.
- According to a seventh aspect of this invention, at least one of the thin resin layers on the inside and outside of the fluid-impermeable layer is of an ethylene-vinyl alcohol copolymer resin (EVOH), a blend of a polyamide and a modified polyolefin resin, a polyamide resin, or a fluororesin. All of these resins are high in fluid impermeability for refrigerant or fuel and in flexibility, so that the hose has a still higher fluid impermeability, and is flexible enough to withstand the vibration of a motor vehicle, or its engine.
- According to an eighth aspect of this invention, at least one of the thin resin layers on the inside and outside of the fluid-impermeable layer has a thickness of 20 to 300 μm. This is a preferred range in which the resin layers can perform its protective action effectively and thus ensure the fluid impermeability without affecting the flexibility of the hose in any way.
- The above and other features and advantages of this invention will become more apparent from the following description and the accompanying drawings.
- FIG. 1 is a partly cutaway perspective view of a hose embodying this invention;
- FIG. 2 is a view similar to FIG. 1, but showing a different embodiment;
- FIG. 3A is fragmentary perspective view of a laminated sheet embodying this invention;
- FIG. 3B is a cross sectional view thereof; and
- FIG. 3C is a view similar to FIG. 3B, but showing a modified form of a laminated sheet.
- Uses of Hoses
- The fluid-impermeable composite hose of this invention can be used for transporting various kinds of fluids. Its preferred use is, however, for transporting a refrigerant, or fuel, particularly in a motor vehicle.
- In the case where the refrigerant is carbon dioxide, the fluid-impermeable composite hose according to the second aspect is preferred, and the fluid-impermeable composite hose according to the third aspect is preferred as the fuel hose.
- Wall Construction of Hoses
- The hose of this invention comprises in its wall a fluid-impermeable layer formed by sandwiching a laminated layer containing a metallic foil or a metallic layer formed by vapor deposition, between two thin resin layers. It may or may not have another layer or layers. The laminated layer may be employed in any position relative to the remaining layer or layers and may, for example, be employed as an inner or intermediate layer.
- The fluid-impermeable layer may form the innermost layer of the wall, or may be lined with a rubber layer. The latter may be of any rubber, but is preferably of e.g. FKM or NBR if the hose is a fuel hose.
- The fluid-impermeable layer may be surrounded by another layer, or layers. For example, it may be surrounded by a reinforcing layer and an outer rubber layer, and an intermediate rubber layer may be interposed between the fluid-impermeable layer and the reinforcing layer.
- Fluid-Impermeable Layer
- The laminated layer and the inner and outer thin resin layers which form the fluid-impermeable layer are preferably bonded to one another. However, they may not be bonded. A usually appropriate process for making the fluid-impermeable layer may include forming the inner resin layer by extrusion, forming the laminated layer about it and forming the outer resin layer by extrusion, though other appropriate processes may be used.
- Laminated Layer
- The laminated layer may be of any construction if it is a laminate containing a metallic foil or a metallic layer formed by vapor deposition. However, it is preferably composed of (1) a metallic foil, (2) a metallic foil with a reinforcing material, or (3) a metallic layer formed by vapor deposition; and a resin film or films laminated thereon.
- The laminated layer is preferably formed by spirally winding or longitudinally lapping a tape of a laminated sheet composed of one of the (1) to (3) above, and a resin film or films. Spiral winding is a method in which a tape of a laminated sheet is wound spirally to form a cylindrical layer having no gap between any two adjoining turns. Longitudinal lapping is a method in which a tape of a laminated sheet having a width large enough to encircle a hose to be made is placed in parallel to the longitudinal axis of the hose and bent into a cylindrical layer having no gap between two longitudinal edges thereof.
- The laminated sheet is usually made by placing the metallic foil or the metallic layer between two resin films and bonding the films to each other with an adhesive, or welding them to each other. A laminated sheet containing a metallic layer formed by vapor deposition may be made by forming such a layer on one side of a resin film and welding or otherwise bonding another resin film to that side. A laminated sheet may also be made by forming a metallic layer by vapor deposition on each of two resin films and welding or otherwise bonding the films to each other in such a way that the metallic layers may join each other.
- In a combination of a metallic foil and a reinforcing material, the reinforcing material is preferably bonded to the foil to produce a higher reinforcing effect. The reinforcing material is preferably situated radially outwardly of the foil. The foil and reinforcing material may or may not be bonded to the resin films. While any kind of reinforcing material may be used, preferred examples are a wire mesh and a reinforcing cloth because of their high stretch resistance and flexibility. Examples of the reinforcing cloths include a canvas and a nonwoven fabric, preferably made from aramid, carbon, glass or like fibers of low stretchability. A resin film of high strength can also be used as the reinforcing material.
- The resin films may be of any appropriate resin, such as a polyamide resin, a polyethylene-terephthalate resin or EVOH. Each film preferably has a thickness of, say, 5 to 100 μm. If its thickness is too large, the laminated sheet is difficult to apply by spiral winding or longitudinal lapping.
- The laminated sheet spirally wound or longitudinally lapped preferably has a pair of spirally or longitudinally extending edge portions overlapping each other to ensure high fluid impermeability. Its overlapping edge portions are preferably bonded to each other to ensure a still higher degree of fluid impermeability.
- Thin Resin Layers
- Any resinous material may be used for the thin resin layers between which the laminated layer is held to form the fluid-impermeable layer, since the resinous materials are generally more impermeable to a refrigerant or fuel than rubbers are. Moreover, the resinous materials are much less liable to deteriorate by swelling or foaming with carbon dioxide in its supercritical state.
- Preferred resinous materials, however, include EVOH and a polyamide resin. Other preferred examples include a modified polyolefin resin obtained by graft polymerization of an unsaturated carboxylic acid or a derivative thereof to a polyolefin consisting basically of e.g. ethylene or propylene, and a mixture of any such modified polyolefin resin and a polyamide resin. These resins are all superior in impermeability and resistance to a refrigerant or fuel, and in flexibility as well. EVOH is, among others, preferred, since it enables the fluid-impermeable layer to resist any undesirably large drop in fluid impermeability even if the metallic foil or layer may have been damaged or broken.
- Examples of the preferred polyamide resins include
nylon 6, nylon 66, nylon 11, nylon 12, or a copolymer thereof, and a polyamide resin having an aromatic, such as m-xylenediamine, in its principal chain. Other preferred resinous materials include polyethylene or polybutylene terephthalate, and polyethylene or polybutylene naphthalate. - The resin layers can be formed by any known method, such as extrusion molding. They preferably have a thickness not exceeding 300 μm each, or not exceeding 500 μm in total, to ensure the flexibility of the hose. An extremely small layer thickness in the order of, say, less than 20 μm should, however, be avoided to ensure fluid impermeability and the formation of a resin layer of uniform thickness not having any opening therein.
- The resin layers are preferably bonded to the laminated layer by, for example, using an adhesive, or welding.
- Intermediate Rubber Layer
- An intermediate rubber layer may be interposed between the fluid-impermeable layer and a reinforcing layer surrounding it, if any, to ensure improved adhesion, protection and flexibility, as stated before. The intermediate rubber layer gives effects as mentioned above with respect to the fifth aspect of the invention. It is preferably of, for example, butyl rubber (IIR), halogenated butyl rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber (EPDM), or nitrile rubber (NBR). These rubbers are high in fluid impermeability and flexibility, and easily achieve a good adhesion to the fluid-impermeable and reinforcing layers at a high temperature. The intermediate rubber layer preferably has a thickness of, say, 0.2 to 1.5 mm.
- Reinforcing Layer
- The hose preferably has a reinforcing layer in its wall. The reinforcing layer may, for example, be a braided wire layer or a layer formed by braiding reinforcing yarn, or winding reinforcing yarn in two spiral layers extending in the opposite directions, or placing an intermediate rubber layer between two such spiral layers.
- Outer Rubber Layer
- An outer rubber layer may form the outermost wall layer of the hose. It is preferably of any rubber of high weatherability, such as chloroprene rubber (CR), IIR, chlorosulfonated polyethylene rubber (CSM), or EPDM.
- Referring first to FIG. 1, a fluid-impermeable
composite hose 1 sequentially comprises a fluid-impermeable layer 2 as the innermost layer of its wall, anintermediate rubber layer 7 formed from IIR, a reinforcinglayer 8 formed by braiding an appropriate kind of reinforcing yarn, and anouter rubber layer 9 formed from IIR. - The fluid-
impermeable layer 2 is composed of an innerthin resin layer 3 formed by extrusion from EVOH and having a thickness of 150 μm, alaminated layer 5 formed by winding a tape of alaminated sheet 4 spirally, and an outerthin resin layer 6 formed by extrusion from EVOH and having a thickness of 150 μm. - The outer
thin resin layer 6 and theintermediate rubber layer 7 are appropriately bonded to each other by vulcanization, and so are theintermediate rubber layer 7 and the reinforcinglayer 8. Thelaminated sheet 4 has a pair of spirally extending edge portions overlapping each other and bonded to each other. - FIG. 2 shows a
hose 10 according to another embodiment of this invention. Its fluid-impermeable layer is composed of an innerthin resin layer 3 formed from a polyamide resin, alaminated layer 5 formed by longitudinally lapping a tape of alaminated sheet 4 and having a pair of longitudinally extending edge portions overlapping each other and bonded to each other, and an outerthin resin layer 6 formed from a polyamide resin. In other respects, thehose 10 is identical to thehose 1 shown in FIG. 1. - The
laminated sheet 4 used in the hoses shown in FIGS. 1 and 2 are shown in detail in FIGS. 3A and 3B. It includes analuminum foil 4 c as a metallic foil and a resin sheet as a reinforcingmaterial 4 d which are sandwiched between aninner resin layer 4 a in the form of a thin film of a thermoplastic PET resin and a similarouter resin layer 4 b, and bonded thereto. - The
metallic foil 4 c is bonded to the reinforcingmaterial 4 d with an adhesive not shown, and is thereby so bound as not to be affected at all by any tensile or like force acting upon thelaminated sheet 4. - FIG. 3C shows a modified form of
laminated sheet 4. It does not have any reinforcing material as shown at 4 d in FIG. 3B., but has only ametallic foil 4 c held between its inner andouter resin layers - While the invention has been described by way of its preferred embodiments, it is to be understood that variations or modifications may be easily made by those skilled in the art without departing from the scope of this invention which is defined by the appended claims.
Claims (20)
1. A fluid-impermeable composite hose having a wall comprising a fluid-impermeable layer of a sandwiched structure in which a laminated layer is held between two thin resin layers, the laminated layer containing a metallic foil, or a metallic layer formed by vapor deposition.
2. The hose according to , wherein the fluid-impermeable layer forms the innermost layer of the wall.
claim 1
3. The hose according to adapted to be used for transporting a refrigerant in a motor vehicle.
claim 2
4. The hose according to , wherein the wall further comprises an inner rubber layer radially inwardly of the fluid-impermeable layer.
claim 1
5. The hose according to adapted to be used for transporting fuel in a motor vehicle.
claim 4
6. The hose according to , wherein the rubber layer is formed of fluororubber or acrylonitrile-butadiene rubber.
claim 4
7. The hose according to , wherein the wall further comprises a reinforcing layer and an outer rubber layer radially outwardly of the fluid-impermeable layer.
claim 1
8. The hose according to , wherein the wall further comprises an intermediate rubber layer interposed between the fluid-impermeable layer and the reinforcing layer.
claim 7
9. The hose according to , wherein the laminated layer is formed of a laminated sheet composed of one of the following (1) to (3), and a resin film or films laminated thereon:
claim 1
(1) a metallic foil;
(2) a metallic foil with a reinforcing material; and
(3) a metallic layer formed by vapor deposition.
10. The hose according to , wherein the laminated layer is formed by winding a tape of the laminated sheet spirally, or lapping with it longitudinally.
claim 9
11. The hose according to , wherein the foil, the foil with a reinforcing material, or the metallic layer is held between two resin films.
claim 10
12. The hose according to , wherein the foil and the reinforcing material are bonded to each other.
claim 9
13. The hose according to , wherein the reinforcing material is a wire mesh or a reinforcing cloth.
claim 12
14. The hose according to , wherein the laminated sheet includes two resin films, and the metallic layer is formed by vapor deposition on one side of one of the resin films, the other resin film being held against that side.
claim 9
15. The hose according to , wherein the laminated sheet includes two resin films, and the metallic layer is formed by vapor deposition on one side of each of the resin films, the resin films being welded or bonded to each other in such a way that the metallic layers may join each other.
claim 9
16. The hose according to , wherein at least one of the resin layers is of a material selected from the group consisting of an ethylene-vinyl alcohol copolymer resin, a mixture of a polyamide resin and a modified polyolefin resin, a polyamide resin and a fluororesin.
claim 1
17. The hose according to , wherein at least one of the resin layers is of an ethylene-vinyl alcohol copolymer resin.
claim 1
18. The hose according to , wherein the polyamide resin is a resin selected from the group consisting of nylon 6, nylon 66, nylon 11, nylon 12, a copolymer thereof and a polyamide resin having an aromatic in its principal chain.
claim 16
19. The hose according to , wherein each of the resin layers has a thickness of 20 to 300 μm.
claim 1
20. The hose according to , wherein the laminated layer is bonded to the resin layers.
claim 1
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-83214 | 2000-03-21 | ||
JP12-083214 | 2000-03-21 | ||
JP2000083214A JP2001263544A (en) | 2000-03-21 | 2000-03-21 | Impermeable composite hose |
Publications (2)
Publication Number | Publication Date |
---|---|
US20010023714A1 true US20010023714A1 (en) | 2001-09-27 |
US6345647B2 US6345647B2 (en) | 2002-02-12 |
Family
ID=18599892
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/810,569 Expired - Fee Related US6345647B2 (en) | 2000-03-21 | 2001-03-19 | Fluid-impermeable composite hose |
Country Status (3)
Country | Link |
---|---|
US (1) | US6345647B2 (en) |
EP (1) | EP1138998A3 (en) |
JP (1) | JP2001263544A (en) |
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US6631743B2 (en) * | 1998-08-13 | 2003-10-14 | Aeroquip-Vickers International Gmbh | Flexible cord-like hollow object |
US6807989B2 (en) | 1998-08-12 | 2004-10-26 | Aeroquip-Vickers International Gmbh | Flexible cord-like hollow object |
WO2005011972A1 (en) | 2003-07-30 | 2005-02-10 | Ezytube Pty Limited | Multi-layer tube of improved physical properties |
US20050170122A1 (en) * | 2004-01-29 | 2005-08-04 | Frank Fahrenholz | Multilayer plastic pipe |
AU2004261313B2 (en) * | 2003-07-30 | 2011-01-27 | Sonoco Australia Pty Limited | Multi-layer tube of improved physical properties |
US20140182735A1 (en) * | 2012-12-28 | 2014-07-03 | Thercom Holdings, Llc | Thermoplastic extrusion with vapor barrier and surface sulfonation |
US20150075665A1 (en) * | 2013-09-17 | 2015-03-19 | Veyance Technologies, Inc. | Refrigerant hose with metal foil layer |
US20180187803A1 (en) * | 2017-01-03 | 2018-07-05 | Titeflex Corporation | Energy-dissipative tubes, arc-trapping bushings, and kits, systems, and methods incorporating the same |
US20220266568A1 (en) * | 2017-02-20 | 2022-08-25 | Mitsui Chemicals, Inc. | Laminate |
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Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3614967A (en) * | 1968-10-08 | 1971-10-26 | Royston Lab | Multilayered pipe coatings and coated pipe |
US4510974A (en) * | 1980-08-21 | 1985-04-16 | Hitachi Cable Ltd. | Fluid conveying hose |
FR2600746B1 (en) * | 1986-06-25 | 1988-09-16 | Choukroun Georgette | RELATIVELY FLEXIBLE MULTISTRATE TUBE WATERPROOF |
US4905736A (en) * | 1987-06-01 | 1990-03-06 | Yokohama Rubber Co., Ltd. | Hose construction |
US5271977A (en) * | 1989-02-10 | 1993-12-21 | Bridgestone Corporation | Low permeable rubber hose |
JPH04131581A (en) * | 1990-09-25 | 1992-05-06 | Bridgestone Corp | Low permeable rubber hose |
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US5488975A (en) * | 1992-06-16 | 1996-02-06 | Heatway Systems, Inc. | Multiple layer flexible hose construction incorporating gas barrier |
FR2716522B3 (en) * | 1994-02-22 | 1996-01-12 | Mr Ind | Cold formable composite duct and shape memory duct. |
WO1996018840A1 (en) * | 1994-12-13 | 1996-06-20 | Nobel Plastiques | Conduit made of composite synthetic material |
US5622210A (en) * | 1995-06-12 | 1997-04-22 | Lsp Products Group, Inc. | Flexible hose with composite core |
US6074717A (en) * | 1997-07-29 | 2000-06-13 | Dayco Products, Inc. | Flexible hose having an aluminum barrier layer to prevent ingestion of oxygen |
JP2000179758A (en) * | 1998-12-16 | 2000-06-27 | Tokai Rubber Ind Ltd | Coolant hose for electric compressor |
-
2000
- 2000-03-21 JP JP2000083214A patent/JP2001263544A/en active Pending
-
2001
- 2001-03-19 US US09/810,569 patent/US6345647B2/en not_active Expired - Fee Related
- 2001-03-20 EP EP01106945A patent/EP1138998A3/en not_active Withdrawn
Cited By (13)
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US6807989B2 (en) | 1998-08-12 | 2004-10-26 | Aeroquip-Vickers International Gmbh | Flexible cord-like hollow object |
US6631743B2 (en) * | 1998-08-13 | 2003-10-14 | Aeroquip-Vickers International Gmbh | Flexible cord-like hollow object |
US8247046B2 (en) | 2003-07-30 | 2012-08-21 | Ezytube Pty Limited | Multi-layer tube of improved physical properties |
WO2005011972A1 (en) | 2003-07-30 | 2005-02-10 | Ezytube Pty Limited | Multi-layer tube of improved physical properties |
US20080045393A1 (en) * | 2003-07-30 | 2008-02-21 | Ezytube Pty Limited | Multi-Layer Tube of Improved Physical Properties |
AU2004261313B2 (en) * | 2003-07-30 | 2011-01-27 | Sonoco Australia Pty Limited | Multi-layer tube of improved physical properties |
US20050170122A1 (en) * | 2004-01-29 | 2005-08-04 | Frank Fahrenholz | Multilayer plastic pipe |
US20140182735A1 (en) * | 2012-12-28 | 2014-07-03 | Thercom Holdings, Llc | Thermoplastic extrusion with vapor barrier and surface sulfonation |
US20150075665A1 (en) * | 2013-09-17 | 2015-03-19 | Veyance Technologies, Inc. | Refrigerant hose with metal foil layer |
US20180187803A1 (en) * | 2017-01-03 | 2018-07-05 | Titeflex Corporation | Energy-dissipative tubes, arc-trapping bushings, and kits, systems, and methods incorporating the same |
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US20220266568A1 (en) * | 2017-02-20 | 2022-08-25 | Mitsui Chemicals, Inc. | Laminate |
Also Published As
Publication number | Publication date |
---|---|
US6345647B2 (en) | 2002-02-12 |
EP1138998A2 (en) | 2001-10-04 |
EP1138998A3 (en) | 2002-04-17 |
JP2001263544A (en) | 2001-09-26 |
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