JP2001182871A - Manufacturing method for low permeable hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a useful manufacturing method for a low permeable hose provided with a cylindrical laminate layer formed by winding a laminate film composed of a metallic thin film layer and a resin film layer, and a thin film resin layer provided on its inner circumference. SOLUTION: The manufacturing method for a low permeable hose formed by a first process for constituting the cylindrical laminate layer formed by winding the laminate film around a core material, and a second process for forming the thin film resin layer by means of powder fusing coating on an inner circumference by slipping the core material off from the cylindrical laminate layer. Preferably, a coating process for forming a protect layer on an outer periphery of the laminate layer is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a low-permeability hose, and more particularly, to a cylindrical laminate layer formed by winding a tape-like laminate film comprising a metal thin film and a resin film, and an inner peripheral surface thereof. The present invention relates to a method for producing a low-permeation hose, comprising:

[0002]

2. Description of the Related Art Conventionally, for example, in fuel hoses for automobiles and the like, various rubber hoses which are advantageous in vibration absorption and assemblability (flexibility), particularly NB having excellent gasoline permeability resistance.
R.PVC (blend material of acrylonitrile butadiene rubber and polyvinyl chloride) and the like have been generally used. Also, in recent years, hoses using a resin material having a higher fuel barrier property than rubber, for example, a fluororesin, etc. as an inner layer have been put on the market from the viewpoint of placing greater emphasis on the fuel impermeability of hoses from consideration for the environment. .

[0003] In the future, it is expected that the regulation of permeation of fuel and the like will be further strengthened. On the other side, it is necessary to cope with highly permeable fluids such as carbon dioxide refrigerant and hydrogen gas used in fuel cells.
It is expected that it will be difficult to satisfy the required performance with a hose made of only an organic material such as rubber or resin.

In view of the above, a metal / resin composite hose in which a metal layer, which can be expected to have a very high fluid impermeability, is used as a barrier layer and reinforced with a resin layer is considered as a possible form of a low permeability hose in the future.

[0005] As a conventional metal / resin composite hose, for example, a composite pipe for hot water supply, hot water heating and drainage disclosed in Japanese Patent Application Laid-Open No. 8-127101 has a hose having a composite structure of a polybutene layer / modified polyolefin layer / metal layer. In accordance with the invention and JP-A-7-275981, a straight tubular metal pipe is coated with a resin layer, and both layers are collectively corrugated (corrugated shape) by means such as external pressure molding or hydraulic bulge molding. Processing) is given as an example of the invention of a resin-coated bellows tube.

[0006] However, the hose as the object of the present invention is required to have a high fluid impermeability, flexibility for assembly, vibration absorption, hose strength and weight balance. The invention according to Kaihei 8-127101 is sometimes referred to as hot water piping for a house,
No consideration is given to vibration absorption or flexibility of the tube, gasoline resistance, resistance of the resin layer to a fluid such as hydrogen gas used in a fuel cell, and the like.

Further, the invention according to the above-mentioned Japanese Patent Application Laid-Open No. 7-275981 is intended to impart vibration absorption by forming a straight tubular metal layer / resin layer composite pipe and performing corrugated processing on the composite pipe. And However, in order to maintain the shape of the metal layer during corrugated shape processing, it is necessary to form a relatively thick metal layer and a thin resin layer. This increases the cost due to the thick metal layer, increases the weight of the hose, and increases the bellows. The deterioration of the flexibility of the tube is inevitable.

[0008]

In view of the above, as a fluid-impermeable metal / resin composite hose, a laminate layer in which a thin metal film is effectively protected by a resin film is used as a barrier layer. It is considered that strengthening with a resin layer is very effective.

However, in this case, there is a problem that it is technically difficult to form the laminate layer as a seamless tubular body. Therefore, it is necessary to form the laminate layer into a cylindrical shape by spirally winding or vertically wrapping a tape-like laminated film composed of a metal thin film and a resin film.

When a general method of spirally winding or vertically wrapping the laminated film around the outer periphery of the resin layer extruded in advance is adopted, the overlapping step portion in the overlapping margin of the first wound laminated film is used. And the sealability of the laminate layer may be impaired. Second, in the overlapped portion of the spirally wound or vertically wrapped laminated film, the hose is likely to be displaced when bent or deformed, and the laminate layer has poor bending / deformation fatigue resistance. Third, to improve the adhesiveness between the laminate layer and the resin layer as a measure against these inconveniences, an extra step of applying an adhesive to the outer periphery of the resin layer is required, resulting in poor production efficiency.

Accordingly, the present invention provides a metal / resin composite hose having a low fluid permeability, comprising a resin layer and a laminate layer formed by winding a tape-shaped laminate film.
The third problem is to manufacture without the third problem.

[0012]

Means for Solving the Problems The structure of the first invention of the present application (the invention of claim 1) for solving the above problems is a tape-like structure comprising a metal thin film and a resin film. A first step of winding a laminate film around a core material to form a cylindrical laminate layer, and a thin film to be the innermost layer of a hose by applying a resin powder coating on the inner peripheral surface of the cylindrical laminate layer from which the core material has been removed And a second step of forming a resin layer.

(Structure of the Second Invention) The structure of the second invention of the present application (the invention according to claim 2) for solving the above problems is as follows.
This is a method for manufacturing a low-permeation hose, further comprising a coating step of forming a protective layer using a resin, rubber, or the like on the outer periphery of the cylindrical laminate layer according to the first invention by an arbitrary method.

(Structure of the Third Invention) The structure of the third invention (the invention according to claim 3) for solving the above problems is as follows.
With another cylindrical part for a hose assembly connected to the cylindrical laminate layer according to the first or second invention, the cylindrical laminate layer and the inner peripheral surface of the cylindrical part are This is a method for producing a low-permeation hose in which the second step is performed.

(Structure of the Fourth Invention) The structure of the fourth invention of the present application (the invention according to claim 4) for solving the above problems is as follows.
In the first step according to the first to third inventions, there is provided a method for manufacturing a low-permeation hose, wherein a tape-shaped laminated film is spirally wound or vertically wrapped around a core material.

(Structure of Fifth Invention) The structure of the fifth invention of the present application (the invention according to claim 5) for solving the above problems is as follows.
A method for manufacturing a low-permeation hose, comprising: setting a layering allowance adhered to the wound laminated film with an adhesive when spirally winding or vertically winding the tape-shaped laminated film according to the fourth invention.

(Structure of the Sixth Invention) The structure of the sixth invention (the invention according to claim 6) for solving the above-mentioned problems is as follows.
A low-permeation hose manufacturing method, wherein the tape-like laminated film according to the first to fifth inventions comprises the metal thin film and the resin film sandwiching the metal thin film from both sides.

(Structure of the Seventh Invention) The structure of the seventh invention of the present application (the invention according to claim 7) for solving the above problems is as follows.
A method for producing a low-permeation hose, wherein the thickness of the tape-like laminated film according to the first to sixth inventions is 30 to 200 μm, and the thickness of the metal thin film is 7 to 50 μm.

(Structure of Eighth Invention) The structure of the eighth invention (the invention according to claim 8) for solving the above problems is as follows.
A method for manufacturing a low-permeation hose, wherein the metal thin film according to the first to seventh inventions is made of aluminum.

(Structure of the ninth invention) The structure of the ninth invention of the present application (the invention according to claim 9) for solving the above problems is as follows.
A method for producing a low-permeation hose, wherein the resin films according to the first to seventh inventions are made of polyamide.

[0021]

Operation and effect of the present invention (operation and effect of the first invention) The method for producing a low-permeation hose according to the first invention relates to a low-permeation hose provided with a cylindrical laminate layer including a metal thin film. , Very high fluid impermeability can be expected. or,
Even if the metal film is thin, the metal film is prevented from being damaged or broken by the protective action of the resin film when the hose is bent or deformed. Furthermore, since the thin film resin layer is formed on the inner periphery of the cylindrical laminate layer, the thinning of the metal layer is ensured as a result, and the flexibility for assembling the hose, the strength of the hose and the balance of weight are improved. Easy to keep.

Then, a tape-shaped laminated film is wound around a core material such as a mandrel to form a cylindrical laminated layer, and a resin is powder-coated on the inner peripheral surface of the cylindrical laminated layer to form a thin film. Since the resin layer is formed, the following effects can be expected.

First, the gap between the laminated steps of the laminated film left during the formation of the cylindrical laminate layer is completely filled by the powder coating of the resin during the formation of the thin film resin layer, and the fluid of the laminate layer is formed. The sealing performance is improved. Second
In addition, the thin film resin layer formed by the powder melt coating has good adhesiveness to the laminate layer, improves the fluid sealability and the bending / deformation fatigue resistance of the laminate layer, and has an adhesive for such purpose. An extra step called agent application can be omitted.

(Operation / Effect of Second Invention) In addition to the first and second steps according to the first invention, as in the second invention,
The function and effect of the first aspect of the present invention can be ensured even when a coating step of forming a protective layer using resin or rubber on the outer periphery of the laminate layer is added.

(Function and Effect of Third Invention) As in the third invention, after connecting the cylindrical hose assembly parts, the powder is collectively applied to the cylindrical laminate layer and the inner peripheral surface of the cylindrical parts. When the melt coating is performed, the inner peripheral surface of the connection portion between the two is also seamlessly covered with the thin film resin layer, so that the fluid sealing property at the connection portion is improved.

(Function / Effect of the Fourth Invention) In winding a tape-shaped laminated film around a core material to form a cylindrical laminated layer, it is extremely effective to form a spirally wound or longitudinally wound as in the fourth invention. And efficient.

(Effects and Effects of the Fifth Invention) When a tape-shaped laminated film is spirally wound or vertically wrapped around a core material, when a lapping margin adhered with an adhesive is set as in the fifth invention, a cylindrical shape is obtained. The fluid sealing property of the entire laminate layer can be further improved.

(Function / Effect of the Sixth Invention) As the tape-shaped laminate film, a metal thin film sandwiched between resin films from both sides as in the sixth invention is used.
The protective effect of the resin film on the metal thin film is further improved, and the resin film on the inner peripheral side is well bonded to the thin film resin layer coated with the powder, and the outer peripheral resin film is covered on the outer side. Good adhesion to the layer.

(Effects and Effects of the Seventh Invention) As in the seventh invention, by setting the thickness of the tape-like laminated film to 200 μm or less, the gap between the overlapping steps in the overlapping margin of the laminated film is minimized. Further, the filling of the gap with the powder resin can be made easier, and the fluid sealing property of the laminate layer can be further improved. In addition, by setting the thickness of the metal thin film of the laminate film to 50 μm or less, it is possible to particularly favorably secure vibration absorption in the low-permeability hose and flexibility for assembling the hose.

When the thickness of the tape-like laminated film is less than 30 μm, there is a problem that the bending durability is remarkably deteriorated. When the thickness of the metal thin film is less than 7 μm, the metal thin film has a disadvantage. There is a concern that a defect such as a pinhole may occur to impair the fluid sealing property.

(Effects and Effects of the Eighth and Ninth Inventions) As a constituent material of the metal thin film, aluminum, which is excellent in fluid barrier properties, extensibility during thin film processing, deformation followability in a thin film state, etc., is particularly preferable. As a constituent material of the resin film of the laminate film, a polyamide excellent in fluid impermeability, adhesion to the thin film resin layer or the protective layer, and the like is particularly preferable.

[0032]

Next, embodiments of the first to ninth inventions will be described. In the following, simply "the present invention"
This means that the first to ninth inventions are collectively referred to.

[Low Permeation Hose] The low permeation hose to which the present invention is directed is a laminate layer formed by winding at least a tape-like laminated film composed of a metal thin film and a resin film around a core, and a cylindrical laminated layer. And a thin film resin layer as an innermost layer of the hose provided on the inner periphery of the hose.
A protective layer having various configurations using resin, rubber, or the like may be provided on the outer periphery of the laminate layer.

The low-permeation hose is used for transporting various fluids (liquid or gas). For example, gasoline, alcohol, alcohol, It can be used arbitrarily as a fuel hose for hydrogen gas, natural gas, propane gas or other fuels, a hose for refrigerants such as chlorofluorocarbon or carbon dioxide gas, or an air hose for automobiles.

It is particularly suitable for the production of filler hoses and the like, because it originally has a high fluid barrier property and the powder melt coating of the thin film resin layer is suitable for the production of large diameter hoses.

[Method of Manufacturing Low Permeability Hose] The method of manufacturing a low permeability hose according to the present invention includes at least the first and second steps. However, any useful step other than the first step and the second step can be added at an arbitrary stage. Preferable examples of the addition step include a case where a coating step according to the second invention is added, and a case where the first step is performed as in the third invention.
The case where the second step is performed with the tubular component for a hose assembly connected to the tubular laminate layer after the step can be exemplified.

[First Step] The first step is a step of winding a tape-like laminated film composed of a metal thin film and a resin film around a core material to form a cylindrical laminated layer.

As a tape-like laminated film,
A metal thin film and a form composed of two resin films adhered or fused to each other by sandwiching the metal thin film from both sides are particularly preferred, as long as the metal thin film and the resin film are laminated films, A form other than the form may be used.

Although the material type of the metal thin film constituting the laminate film is not limited, it is excellent in at least one of various properties such as fluid barrier properties, extensibility at the time of thin film processing, and deformation followability in a thin film state. Aluminum, copper, titanium, stainless steel and the like are preferred, and aluminum is particularly preferred.

Although the thickness of the metal thin film is not limited, it is preferably about 7 to 50 μm as in the seventh invention in view of the balance between the flexibility of the hose and the fluid barrier properties of the metal thin film. Although the thickness of the entire laminate film can be arbitrarily set, it is preferable that the thickness of the laminate film be 7th from the viewpoint of the above-described sealing property at the overlapping step portion of the laminate film.
It is about 30 to 200 μm as in the invention.

The material type of the resin film constituting the laminate film is not limited, but is preferably a thermoplastic resin, and is usually a thermoplastic resin. In consideration of adhesiveness, it is preferable to use a polyamide, an amine-modified polyamide, or a resin material of the same quality as the resin constituting the protective layer or the thin film resin layer. It is also preferable that the outer surface of the resin film is subjected to an adhesion improving treatment such as a corona treatment.

The method of winding the laminate film is arbitrary, as long as the laminate film is wound without any gaps to form a cylindrical laminate layer. For this reason, spiral winding or vertical wrapping is preferred. "Spiral winding" refers to a method in which a single tape-shaped laminated film is wound in a spiral direction to form a cylindrical body, and "vertical wrapping" refers to a method in which a single tape-shaped laminated film is wound longitudinally ( It refers to a method of forming a cylindrical body by winding along a (tube axis) direction.

In the spiral winding or the vertical winding, from the viewpoint of the fluid sealing property of the laminate layer, the laminate film is wound by providing a fixed overlap margin between the edge portions thereof, and particularly, by using an adhesive in the overlap margin. Preferably, the edges are glued together. Adhering the overlap margin portion is also preferable from the viewpoint of maintaining the shape of the cylindrical laminate layer when the core material is removed in the second step.

In the first step, as the core material, a round rod or a tube having an appropriate thickness calculated from a predetermined inner diameter of the hose may be used, but a protective layer coated on the outer peripheral side may be used. In the case of extrusion molding, it is preferable to use a mandrel as a core material.

[Second Step] The second step is a step of forming a thin film resin layer as the innermost layer of the hose by applying a resin powder coating on the inner peripheral surface of the cylindrical laminate layer from which the core material has been removed. In this step, as in the third aspect of the present invention, while connecting another cylindrical component for the hose assembly to the cylindrical laminate layer, the inner peripheral surface of the cylindrical laminate layer and the cylindrical component is It is also preferable that the resin is melt-coated with a powder, since the above-mentioned functions and effects of the third invention can be obtained.

As a typical method of powder melting coating, a method including a series of steps of electrostatic coating of thermoplastic resin powder and heat melting of the coating powder is used. Other methods may be used as long as a uniform thin film resin layer can be formed on the inner peripheral surface of the laminate layer. The powder coating may be repeated a plurality of times to form a thin-film resin layer having a multilayer structure.

Although the type of the resin powder is not limited, polyamide, EVOH (ethylene-vinyl alcohol resin),
Preferable examples include polyester, modified polyolefin, and fluororesin. In particular, when the resin film of the laminate layer is a polyamide, it is preferable that the resin powder is also a polyamide. As the modified polyolefin, silane-crosslinked or acid- or hydroxyl-modified polyethylene is particularly preferred.

In the case where heat resistance is required for a low-permeability hose such as a fuel hose used in an engine room, an air hose, a cooler hose, etc., PA6, PET, PBT, and 3-foot, which have excellent heat resistance, are required. Ethylene chloride
In the case of a low-permeation hose that contacts vinylidene fluoride copolymer, THV, PVDF, etc. with high-temperature steam, modified polyethylene, low-water-absorbing polyamide (for example, PA11, PA12, aromatic PA) or the like that withstands high temperature and high humidity is preferable. Can be used.

The thickness of the thin film resin layer cannot be uniformly defined because the requirements are different depending on the type of the resin and the application of the low-permeation hose, but it is not possible to uniformly define the thickness.
The thickness of the thin film resin layer using polyamide is 20-200μ.
m, the thickness of the thin film resin layer using the modified polyolefin can be about 40 to 300 μm, and the thickness of the thin film resin layer using the fluororesin can be about 20 to 100 μm.

[Coating Step] The coating step is a step of forming a protective layer using resin or rubber or the like on the outer periphery of the cylindrical laminate layer formed in the first step by an arbitrary method. This step may be performed prior to the second step, or may be performed after the second step. However, when the protective layer is extruded, the protective layer is extruded as it is in the first step with the cylindrical laminated layer formed using the mandrel as the core material, and then the core material is removed and the second step is performed. It is efficient to do.

The type and configuration of the protective layer are not limited. For example, a protective layer such as a rubber layer, a resin layer, and two rubber layers having a reinforcing yarn layer wound spirally or braided in the middle is formed by extrusion molding or injection molding. , Can be arbitrarily formed by an appropriate combination of methods such as reinforcing yarn braiding.
When a rubber layer is formed by extrusion molding or injection molding, a vulcanization step is usually required.

As the rubber material constituting the protective layer, hydrin rubber, NBR / PVC, or the like is used in consideration of the adhesiveness to the cylindrical laminate layer (especially when the resin film of the cylindrical laminate layer is made of polyamide). Multilayer of halogenated butyl rubber and EPDM (ethylene propylene diene rubber), multilayer of fluorine rubber and NBR / PVC, EPDM
And the like are preferably exemplified.

As the resin material constituting the protective layer, a thermoplastic resin is used when formed by an extrusion molding method. When the adhesiveness with the cylindrical laminate layer is taken into consideration (especially when the resin film of the cylindrical laminate layer is made of polyamide), polyamide, PA6, PA11, P
A12, modified PE, multilayered structure of modified PE and PE, modified P
P, a multi-layered body of modified PP and PP, a multi-layered body of modified PP and santoprene (PP + EPDM thermoplastic elastomer) and the like are preferably exemplified. Further, when the low-permeation hose is required to have heat resistance or comes into contact with high-temperature steam, it is preferable to select the same resin type as when selecting the type of the powder resin.

[Embodiment of Low Permeation Hose] In a low permeation hose 1 according to the embodiment shown in FIG. 1, a tape-shaped laminated film 2 made of a metal thin film and a resin film is wound around a cylindrical laminated layer 3. Is formed on the inner periphery thereof, and a thin-film resin layer 4 formed by powder-coating a resin is provided on the inner periphery, and a rubber layer, a resin layer, a reinforcing thread layer, etc. made of an appropriate material are formed on the outer periphery of the laminate layer 3. A protective layer 5 using elements alone or in combination is formed.

In the laminate layer 3, the laminate film 2 is wound vertically so that the edges thereof are wound so as to form a overlap margin 6 having a constant width. 2 is adhered by an adhesive.

[Example of Embodiment of Manufacturing Method of Low Permeability Hose]
In the method of manufacturing a low-permeation hose according to the embodiment shown in FIG. 2 in a simplified manner, first, the laminating film 2 is applied to a mandrel 7 of an extruder (not shown) as shown in FIG.
As shown in (a), it is wound in a spiral winding, or FIG.
As shown in FIG. 5, the laminate is wound in a vertical wrapping to form a cylindrical laminate layer 3.

Next, as shown in FIG. 2C, the protective layer 5 is coated on the outer periphery of the cylindrical laminate layer 3 with the mandrel 7 by extrusion molding. At that time, the protective layer 5
When the protective layer 5 includes a rubber layer, the vulcanizing step is performed, and when the protective layer 5 includes the reinforcing yarn layer, the braiding step is performed.

Next, with the mandrel 7 removed from the laminate layer 3, resin powder is applied to the inner periphery of the laminate layer 3 using an electrostatic coating gun 8, as shown in FIG. At this time, a cylindrical hose assembly component (not shown) may be connected to the laminate layer 3 in advance, and the resin powder may be applied to the laminate layer 3 and the inner periphery of the hose assembly component at once. . Thereafter, the coated resin powder is heated and melted to form the thin film resin layer 4 (not shown).

[0059]

[Example] [ Production of hoses according to Examples, Comparative Examples and Reference Examples]
Ltd.] thin aluminum film (Example 1) thickness 9μm thick 25
A tape-shaped laminated film sandwiched between both sides with a 6-μm nylon 6 film is wound around a 25 mm-thick resin mandrel around a vertical wrap with a predetermined width of overlap set. Was applied and adhered by applying a polyurethane adhesive (Hybon, trade name of Hitachi Chemical Co., Ltd.).

Next, a hydrin rubber layer having a thickness of 2 mm was formed thereon by extrusion molding and covered, and then vulcanized to obtain a hose structure, from which the mandrel was removed. next,
A powder obtained by freezing and pulverizing commercially available EVOH pellets (trade name “EVAL” of Kuraray Co., Ltd.) was coated on the inner peripheral surface of the hose structure by electrostatic powder coating. Then, the powder was melted by heating the entire hose to form a thin-film resin layer, whereby a low-permeation hose according to Example 1 was obtained.

( Example 2 ) In the same manner as in Example 1, a laminated film was vertically wrapped around and a portion of the overlap margin was adhered, and a 0.3 mm-thick brominated butyl rubber layer was further placed on the laminated film.
An EPDM layer having a thickness of 1.7 mm is coated by extrusion molding into two layers, and then vulcanization is performed in the same manner as in Example 1, a mandrel is removed, electrostatic powder coating of EVOH and heating of the thin film resin layer are performed. After forming, a thin resin layer was formed on the inner surface by electrostatic powder coating of PA11 powder (trade name “Rilsan Fine Powder” manufactured by Elphatochem Co., Ltd.) and heating to form a low-permeation hose according to Example 2. Obtained. The thin film resin layer has a two-layer structure.

Example 3 A laminated film in which a 9 μm-thick aluminum thin film was sandwiched from both sides by an inner nylon 6 film and an outer nylon 11 film, each having a thickness of 25 μm, as in Example 1 Spiral-winding the same mandrel and bonding the overlap margin, and then a 0.9 mm thick PA11 layer (7% by weight plasticizer)
) Was extruded and coated, and then a two-layer thin film resin layer was formed in the same manner as in Example 2 to obtain a low-permeation hose according to Example 3.

( Example 4 ) In comparison with Example 3, a PA11 layer made of the same material and having the same thickness was formed in exactly the same manner as in Example 4 except that it was formed by electrostatic powder coating and heating. A low permeability hose was obtained.

( Example 5 ) The same laminated film as in Example 3 was wrapped vertically and bonded at the overlap margin in the same manner as in Example 1, and the hydrin rubber layer was extruded to cover and vulcanize. Was. And this hose structure is length 200L
Cut into pieces.

On the other hand, the outer diameter is 25.5 mm and the length is 10.2 m
m, the insertion part (length 20) of the degreased steel pipe that can be connected to other pipes
L) A primer (trade name “Rilprim” manufactured by Elphatochem Co.) was applied to the inner surface, and this was press-fitted from both ends of the hose structure. Then, the inner surface of the steel pipe was masked except for the portion to which the primer was applied, and PA11 was applied to the inner surface of the hose structure and the steel pipe.
A thin resin layer was formed by applying an electrostatic powder to the powder (trade name “Rilsan Fine Powder” manufactured by Elphatochem Co., Ltd.) and heating to obtain a low-permeation hose according to Example 5 in a hose assembly state.

( Comparative Example 1 ) A hose according to Comparative Example 1 was obtained in exactly the same manner as in Example 2 except that a two-layered thin film resin layer was not formed.

REFERENCE EXAMPLE 1 A tape-like laminated film in which a 20 μm-thick aluminum thin film was sandwiched from both sides with a 50 μm-thick nylon 6 film was wrapped vertically and wound in the same manner as in Example 1. With the above portions adhered, the same two coating layers as in Example 2 were extruded and vulcanized, and then the mandrel was removed to form a thin resin layer similar to that in Example 1 on the inner surface of the hose structure. Was formed by electrostatic powder coating and by heating to obtain a low-permeation hose according to Reference Example 1.

[ Evaluation of Hose Produced ] ( Sealability ) Except for the low-permeability hose according to Example 5, the hose of each of the above examples was cut to a length of 200 L, and the same steel pipe as in Example 5 was cut at both ends. It was press-fitted through the opening. Then, the hose of each example including the low-permeability hose according to Example 5 was fixed by a worm gear clamp, and one side of the opening was blind-plugged and filled with water from the other side of the opening, and 0.4MPa.
A pressure was applied for 30 seconds at a, and water seepage (wet leakage) or leakage (water dripping) was visually observed from the press-fit portion of the steel pipe into the hose.

As a result, although water leakage was observed in Comparative Example 1 and water bleeding was observed in Reference Example 1, Examples 1 to 5
No water seepage or leakage was observed.

( Hose Inner Surface State After Filling Fuel ) As in the case of the above-mentioned evaluation of the “sealability”, “Fuel C (toluene 50 vol.% +
Isooctane 50 vol.%) ”And sealed at 40 ° C.
The inner surface condition of the hose after aging for 8 hours was visually observed. As a result, in Comparative Example 1, floating of the joint of the laminate sheet (the occurrence of a gap in the overlap margin) was recognized, but in each of the other examples, there was no abnormality.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a low-permeation hose.

FIG. 2 is a diagram showing an embodiment of a method for manufacturing a low-permeation hose.

[Explanation of symbols]

 1 Low permeability hose 2 Laminated film 3 Laminated layer 4 Thin film resin layer 5 Protective layer 6 Overlap

Continuing from the front page (72) Inventor Tomoshige Hibino 3-1, Higashi 3-chome, Komaki City, Aichi Prefecture (72) Inventor Hidehito Ikeda 1-3-1, Higashi 3-chome, Komaki City, Aichi Prefecture F Term (reference) 3H111 AA02 BA01 BA04 BA15 CA02 CA03 CA08 CB03 CB04 CB08 CB27 CB29 DA09 DA26 DB08 DB19 EA01 EA17 4F100 AB01A AB10A AB33A AK01B AK01D AK01E AK14 AK46B AK46E AK69 BA10 BA10 BA03 BA10 BA03 BA03 JD01 JK01 JK04 JK06 JK08 JK13 JK17 JK20 JL00 YY00A 4F213 AA29 AA45 AC03 AC04 AD03 AD08 AD18 AD20 AG03 AG08 WA03 WA14 WA53 WA58 WB01 WB22

Claims (9)

[Claims] 1. A first step of forming a cylindrical laminated layer by winding a tape-shaped laminated film composed of a metal thin film and a resin film around a core, and an inner peripheral surface of the cylindrical laminated layer from which the core is removed. A second step of forming a thin film resin layer as an innermost layer of the hose by subjecting the resin to powder melt coating. 2. The low-permeation hose according to claim 1, wherein a coating step of forming a protective layer using a resin, rubber, or the like on the outer periphery of the cylindrical laminate layer by an arbitrary method is added. Method. 3. The method according to claim 2, wherein the second step is performed on an inner peripheral surface of the tubular laminate layer and the tubular component while another tubular component for a hose assembly is connected to the tubular laminate layer. The method for producing a low-permeation hose according to claim 1 or 2, wherein the method is performed. 4. The low-permeation hose according to claim 1, wherein, in the first step, a tape-shaped laminated film is spirally wound or vertically wrapped around a core material. Manufacturing method. 5. The method according to claim 4, wherein, when the tape-shaped laminated film is spirally wound or vertically wrapped, an overlap margin is attached to the wound laminated film with an adhesive. Manufacturing method of low permeability hose. 6. The tape-like laminate film,
The method according to any one of claims 1 to 5, comprising the metal thin film and the resin film sandwiching the metal thin film from both sides. 7. The tape-like laminate film has a thickness of 30 to 200 μm, and the metal thin film has a thickness of 7 to 200 μm.
7. The structure according to claim 1, wherein the thickness is from 50 to 50 .mu.m.
The method for producing a low-permeation hose according to any one of the above. 8. The method according to claim 1, wherein the metal thin film is made of aluminum. 9. The method according to claim 1, wherein the resin film is made of polyamide.