WO1999057473A2 - Tuyau de remplissage multicouche pour reservoirs de carburant de vehicules - Google Patents

Tuyau de remplissage multicouche pour reservoirs de carburant de vehicules Download PDF

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Publication number
WO1999057473A2
WO1999057473A2 PCT/US1999/006565 US9906565W WO9957473A2 WO 1999057473 A2 WO1999057473 A2 WO 1999057473A2 US 9906565 W US9906565 W US 9906565W WO 9957473 A2 WO9957473 A2 WO 9957473A2
Authority
WO
WIPO (PCT)
Prior art keywords
layer
ethylene copolymer
pipe
adhesive
inner zone
Prior art date
Application number
PCT/US1999/006565
Other languages
English (en)
Other versions
WO1999057473A3 (fr
Inventor
Saurin Mehta
Original Assignee
Solvay Automotive, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Solvay Automotive, Inc. filed Critical Solvay Automotive, Inc.
Priority to JP2000547397A priority Critical patent/JP2002513902A/ja
Priority to CA002331317A priority patent/CA2331317A1/fr
Priority to KR1020007012417A priority patent/KR20010052318A/ko
Priority to EP99921352A priority patent/EP1076791A2/fr
Priority to AU38589/99A priority patent/AU3858999A/en
Publication of WO1999057473A2 publication Critical patent/WO1999057473A2/fr
Publication of WO1999057473A3 publication Critical patent/WO1999057473A3/fr

Links

Classifications

    • 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
    • F16L9/00—Rigid pipes
    • 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
    • F16L9/00—Rigid pipes
    • F16L9/12—Rigid pipes of plastics with or without reinforcement
    • F16L9/125—Rigid pipes of plastics with or without reinforcement electrically conducting

Definitions

  • the present invention relates to a pipe for use in a motor vehicle, more specifically, to a multi-layer filler pipe for connection to a motor vehicle fuel tank.
  • Filler pipes for connection to motor vehicle fuel tanks are subject to multiple design constraints, including those related to emissions tolerance, conductivity, price, weight, and durability.
  • the U.S. Clean Air Act Amendment of 1990 sets more stringent hydrocarbon emissions standards for all vehicles. So called light vehicles will be required to meet a diurnal standard of no more than 2 grams of emitted hydrocarbons per day. The diurnal standard will be phased in over the next few years, ending in the year 2000 with 100% compliance.
  • motor vehicle fuel possesses charged particles that can build up as the fuel moves across a non-conductive surface.
  • this charge is released in a localized area of a filler pipe, the discharge can degrade the strength of the pipe and lead to pipe failure, leaks, and fires.
  • the surface over which fuel passes in a filler pipe should have sufficient surface conductivity to dissipate any electrostatic charge that may build up.
  • Price constraints also define several design parameters. While fabrication costs are primary considerations, operation costs of the resulting vehicle are also closely monitored. These operation costs are functions of the vehicle's weight, which affects fuel consumption and efficiency. To address these concerns it is important to identify a low cost, lightweight material from which to construct a filler pipe.
  • Fire is a constant threat in an automotive environment.
  • a filler pipe should be resistant to this threat.
  • recent changes in European specifications have increased the fire resistance requirements for automobiles and their fuel systems in the European market. For these reasons it is important that the filler pipe be sufficiently resistant to fire.
  • a filler pipe must also withstand the hazards of a motor vehicle environment, including corrosion and mechanical failure.
  • Corrosive agents to which the pipe may be exposed include fuel, oil, brake fluid, and road salt.
  • Mechanical phenomena that may act upon a filler pipe include deformation, fatigue, and vibration. For these reasons, it is important that the filler pipe material be sufficiently durable.
  • Fuel lines and vapor return lines of synthetic materials have been proposed. These lines possess some of the characteristics that are desirable in a modern filler pipe. However, the materials they are made out of, such as polyamides, are prohibitively expensive for use in filler pipe construction. These cost constraints are tolerated in fuel line construction due to additional design criteria that are not shared with filler pipes, such as high temperature and high pressure performance and reduced elongation characteristics.
  • WO 98/01694 to Hsich discloses a multi-layer tubing assembly for use in fuel line applications.
  • An outer layer of a rubber-like multiphase polymer e.g. polyamide
  • the rubber-like multiphase polymer of the outer layer is selected from the group consisting of polymer blends or copolymers of polyamides, polyesters, polyurethane, and matallocene polyolefins.
  • 5,566,720 to Cheney proposes a two-layer fuel line composed of a thick corrosion-resistant outermost layer formed of a material, preferably a polyamide, that is durable and resistant to environmental degradation.
  • An innermost fuel-contacting layer of a terpolymer is bonded to the thick outer layer.
  • U.S. Patent No. 5,678,611 to Noone discloses a three-layer, co-extruded fuel line composed of an outer exterior wall of an extrudable polyamide, an inner hydrocarbon barrier layer, and an intermediate bonding layer.
  • the inner hydrocarbon barrier layer may be capable of dissipating electrostatic energy, while the outer layer comprises a relatively thick layer of polyamide that is non-reactive with the external environment.
  • Polyethylene especially medium to high density polyethylene, is a durable material that is an inexpensive alternative to other durable synthetic materials, such as polyamides.
  • a filler pipe made of polyethylene can be made with thicker walls due to polyethylene's lower cost and lighter weight. The added thickness and choice of material improve the filler pipe's resistance to fire while improving durability.
  • a filler pipe constructed of an outer zone of polyethylene and a zone of a conductive barrier material is advantageously impermeable, conductive, fire resistant, lightweight, inexpensive, and resistant to chemical and mechanical degradation, thereby addressing the above-mentioned concerns and shortcomings of conventional filler pipe technology.
  • the filler pipe comprises, in cross section, two zones that directly abut each other, wherein an outer zone comprises polyethylene and an inner zone comprises a material or materials capable of dissipating electrostatic energy and blocking the permeation of hydrocarbons.
  • Figure 1 is a sectional view through a wall of a piece of the pipe of an embodiment of the present invention
  • Figure 2 is a sectional view through a wall of a piece of the pipe of another embodiment of the present invention.
  • Figure 3 is a sectional view through a wall of a piece of the pipe of another embodiment of the present invention.
  • Figure 4 is a sectional view through a wall of a piece of the pipe of a further embodiment of the present invention.
  • Figure 5 is a sectional view through a wall of a piece of the pipe of still another embodiment of the present invention.
  • Figure 6 is a sectional view through a wall of a piece of the pipe of yet another embodiment of the present invention.
  • Figure 7 is a sectional view through a wall of a piece of the pipe of the embodiment of Figure 6, with greater detail of the adhesive layer (14) of the inner zone (2).
  • the present invention is a multi-layer filler pipe for connection to a motor vehicle fuel tank.
  • the filler pipe is capable of transporting fluids, particularly those containing hydrocarbons.
  • the filler pipe material is suitable for use in motor vehicles and comprises an outer zone that is resistant to the environment of a motor vehicle by being capable of withstanding impact from stones and road debris, various shocks, vibrational fatigue, and changes in temperature. Furthermore, the filler pipe material is able to withstand exposure to various corrosive or degradative agents to which it will be exposed through the normal course of operation of the motor vehicle, such as brake fluid, engine oil, road salt, gasoline, and the like.
  • the filler pipe of the present invention comprises an outer zone and an inner zone.
  • the filler pipe of the present invention can be fabricated by any suitable means, such as blow molding, co-extrusion, and the like. Co-extruding the given thermoplastic materials in a conventional co-extrusion process to form the outer and inner zones, however, is most preferred.
  • the filler pipe can either be co-extruded to a suitable length or can be co-extruded in continuous length and subsequently cut to fit a given application.
  • the various layers of the filler pipe construction are preferably bonded to one another and are preferably resistant to separation throughout the lifetime of the filler pipe.
  • the filler pipe of the present invention can have any suitable wall thickness desired, as measured from the innermost wall of the inner zone to the outermost wall of the outer zone.
  • the preferred wall thickness of the present invention for use in automotive systems, will generally be between about 1.5 mm and about 3.0 mm, preferably about 2.0 mm to about 3.0 mm, most preferably, about 2.4 mm to about 2.6 mm.
  • the outer zone (1 ) has a wall thickness sufficient to provide suitable strength and endurance to the multi-layer pipe of the present invention.
  • "Outer zone” means that zone which is positioned radially outermost of the filler pipe.
  • the outer zone (1 ) comprises a single layer of polyethylene that provides shape to the resulting filler pipe.
  • the outer zone (1 ) polyethylene can also be made thick enough to provide adequate structure for mounting components to the filler pipe. It is resistant to fire, impact, vibrational shock, and the corrosive effects of a typical motor vehicle environment.
  • the polyethylene used in the filler pipe of the present invention can be of any suitable grade, however, medium to high density polyethylene are preferred.
  • the polyethylenes used in filler pipes can be medium or high density, depending on the process and desired end characteristics of the filler pipe. If the filler pipe is made using a blow molding process, then low melt index high density polyethylene is often preferred. Similarly, if the filler pipe layers are formed via co-extrusion, then either medium density polyethylene or high density polyethylene is often preferred.
  • Environmental stress crack resistance is often considered an important design characteristic. If this is the case, then one should choose a grade of polyethylene with good environmental stress crack resistance properties. Other factors considered when choosing a polyethylene include the flex modulus and other mechanical properties. Examples of grades of polyethylene that may be used include, without limitation, the commercially available polyethylenes known as Solvay Fortiflex® G36-24-149, K44-24-123, and K44-08-123.
  • the inner zone (2) is positioned radially innermost of the filler pipe.
  • the inner zone (2) contains a material capable of serving as a hydrocarbon barrier layer to prevent significant permeation of the components of gasoline through to the outer zone (1 ) of the filler pipe and thus out to the surrounding environment.
  • Suitable materials include, but are not limited to, chlorotrifluoroethylene/ethylene copolymer, polychlorotrifluoroethylene, tetrafluoroethylene/hexafluoropropylene/vinylidene fluoride terpolymer, tetrafluoroethylene/ethylene copolymer, and polyvinylidene fluoride.
  • the inner zone (2) has an innermost material with a surface oriented to come into direct contact with fuel traveling through the filler pipe.
  • the selected material is suitably resistant to the corrosive effects of fuel.
  • materials that can be used for the inner surface include, but are not limited to, high density polyethylene, chlorotrifluoroethylene/ethylene copolymer, polychlorotrifluoroethylene, tetrafluoroethylene/hexafluoropropylene/vinylidene fluoride terpolymer, tetrafluoroethylene/ethylene copolymer, and polyvinylidene fluoride.
  • the selected innermost material in the inner zone (2) is capable of dissipating electrostatic energy.
  • the material of the innermost layer of the inner zone (2) can include conductive material incorporated therein.
  • the conductive material can be any suitable material of a composition and shape capable of electrostatic dissipation. Examples of conductive material that can be used include, without limitation, elemental carbon, stainless steel, silvered glass fibers, metalized textiles, and highly conductive metals such as iron, copper, silver, gold, nickel, silicon and mixtures thereof.
  • the conductive metals can be present in the form of granules, flakes, fibers, and the like.
  • the term “elemental carbon”, as used herein, refers to materials commonly referred to as "carbon black".
  • the conductive material is co-extruded with the barrier materials employed in the inner zone (2) in sufficient quantity to permit electrostatic dissipation with resistivity less than, for example, about 10 6 ohm/sq.
  • the amount of conductive material incorporated in the selected material of the innermost layer of the inner zone (2) is generally limited by considerations of low temperature durability and resistance to the degradative effects of the gasoline or fuel passing through the filler pipe. More specifically, the addition of conductive material can make the polymer susceptible to the permeation of hydrocarbons.
  • a second layer in the inner zone (2) which comprises a polymer selected from the group of chlorotrifluoroethylene/ethylene copolymer, polychlorotrifluoroethylene, tetrafluoroethylene/hexafluoropropylene/vinylidene fluoride terpolymer, tetrafluoroethylene/ethylene copolymer, and polyvinylidene fluoride that does not contain added conductive material.
  • the adhesive should be chosen such that there is sufficient laminar adhesion between the adhesive and the two abutting layers that there will not be separation of the layers during the lifetime of the pipe.
  • the adhesive should be compatible with polyethylene and the barrier layer. If a single adhesive is not compatible with both, then two different adhesive layers can be used: one compatible with polyethylene and the other compatible with the barrier layer, making sure that there is sufficient bonding between the two adhesives. It may also be desirable to use a mixture of two or more types of adhesives. It is known to use pressure sensitive adhesives, hot melt adhesives, and adhesive with cross-linkers when working with polyethylene. Such adhesives can be reactive or non-reactive, providing chemical or mechanical bonding. Examples of adhesives that possess such properties include, without limitation, Mitsui (America) AdmerTM adhesive, BlemmerTM adhesive and mixtures thereof.
  • Figure 1 depicts a preferred embodiment of the filler pipe of the present invention wherein the outer zone (1 ) is comprised of a single layer of polyethylene and the inner zone (2) is comprised of a single conductive layer (3) of the barrier material selected from the group consisting of conductive chlorotrifluoroethylene/ethylene copolymer, conductive polychlorotrifluoroethylene, and conductive tetrafluoroethylene/ethylene copolymer.
  • the barrier material selected from the group consisting of conductive chlorotrifluoroethylene/ethylene copolymer, conductive polychlorotrifluoroethylene, and conductive tetrafluoroethylene/ethylene copolymer.
  • Figure 2 shows another preferred embodiment of the filler pipe of the present invention wherein the outer zone (1 ) is comprised of a single layer of polyethylene.
  • the inner zone (2) is comprised of an outermost layer (4) of an adhesive and an innermost layer (5) of a conductive form of a barrier material selected from the group consisting of conductive chlorotrifluoroethylene/ethylene copolymer, conductive polychlorotrifluoroethylene, conductive tetrafluoroethylene/ hexafluoropropylene/vinylidene fluoride terpolymer, and conductive tetrafluoroethylene/ethylene copolymer.
  • the adhesive layer (4) is capable of bonding to both the outer zone (1 ) layer and the innermost layer (5) of the inner zone (2) .
  • Figure 3 shows a preferred embodiment of the filler pipe of the present invention wherein the outer zone (1 ) is comprised of a single layer of polyethylene.
  • the inner zone (2) is comprised of an innermost layer (7) of a conductive form of a barrier material selected from the group consisting of conductive chlorotrifluoroethylene/ethylene copolymer, conductive polychlorotrifluoroethylene, and conductive tetrafluoroethylene/ethylene copolymer, and an outermost layer (6) of a non-conductive form of the same barrier material selected from the group consisting of chlorotrifluoroethylene/ethylene copolymer, polychlorotrifluoroethylene, and tetrafluoroethylene/ethylene copolymer.
  • a barrier material selected from the group consisting of conductive chlorotrifluoroethylene/ethylene copolymer, conductive polychlorotrifluoroethylene, and conductive tetrafluoroethylene/ethylene copolymer.
  • Figure 4 shows a preferred embodiment of the filler pipe of the present invention wherein the outer zone (1 ) is comprised of a single layer of polyethylene.
  • the inner zone (2) is comprised of an innermost layer (9) of conductive polyethylene and an outermost layer (8) of a barrier material selected from the group consisting of chlorotrifluoroethylene/ethylene copolymer, polychlorotrifluoroethylene, and tetrafluoroethylene/ethylene copolymer.
  • a barrier material selected from the group consisting of chlorotrifluoroethylene/ethylene copolymer, polychlorotrifluoroethylene, and tetrafluoroethylene/ethylene copolymer.
  • Figure 5 shows a preferred embodiment of the filler pipe of the present invention wherein the outer zone (1 ) is comprised of a single layer of polyethylene.
  • the inner zone (2) is comprised of an innermost layer (13) of polyethylene, an intermediate layer (11 ) of a barrier material selected from the group consisting of chlorotrifluoroethylene/ethylene copolymer, polychlorotrifluoroethylene, and tetrafluoroethylene/ethylene copolymer, and two adhesive layers (10 and 12).
  • the outermost adhesive layer (10) is capable of bonding to both the outer zone (1 ) layer and the inner zone (2) outermost layer (8) to provide the desired level of laminar bonding.
  • the innermost adhesive layer (12) is capable of bonding to both the inner zone (2) innermost layer (13) and the inner zone (2) intermediate layer (11 ) to provide the desired level of laminar bonding.
  • Figure 6 shows a preferred embodiment of the filler pipe of the present invention wherein the outer zone (1 ) is comprised of a single layer of polyethylene.
  • the inner zone (2) is comprised of an outermost layer (14) of an adhesive, an innermost layer (16) of the conductive form of a barrier material selected from the group consisting of conductive chlorotrifluoroethylene/ethylene copolymer, conductive polychlorotrifluoroethylene, conductive tetrafluoroethylene/ethylene copolymer, and conductive tetrafluoroethylene/hexafluoropropylene/vinylidene fluoride terpolymer, and an intermediate layer (15) of the non-conductive form of the same barrier material selected from the group consisting of chlorotrifluoroethylene/ethylene copolymer, polychlorotrifluoroethylene, tetrafluoroethylene/ethylene copolymer, and tetrafluoroethylene/hexafluoropropylene/vinylidene fluoride terpol
  • the adhesive layer (14) is capable of bonding to both outer zone (1 ) layer and the inner zone (2) intermediate layer (15) to provide the desired level of laminar bonding. There is sufficient homogeneity between the conductive form of the barrier material and its non-conductive form to provide the desired level of laminar bonding between the innermost layer (16) and the intermediate layer (15) of the inner zone (2).
  • the outer zone (1 ) is comprised of a single layer of polyethylene.
  • the inner zone (2) is comprised of an innermost layer (16) of conductive polyvinylidene fluoride, an intermediate layer (15) of non- conductive polyvinylidene fluoride, and an outermost layer (14) of an adhesive.
  • the adhesive is capable of bonding the outer zone (1 ) to the non-conductive layer (15) of polyvinylidene fluoride and can be selected, without limitation, from the group consisting of Mitsui (America) AdmerTM adhesive, BlemmerTM adhesive and mixtures thereof.
  • the adhesive layer (14) is a mixture of AdmerTM and BlemmerTM adhesive.
  • the adhesive layer (14) comprises an outermost sublayer of AdmerTM adhesive (17) and an innermost sublayer of BlemmerTM adhesive (18). There is sufficient homogeneity between the conductive polyvinylidene fluoride and the non-conductive polyvinylidene fluoride to provide the desired level of laminar bonding between the innermost layer (16) and the intermediate layer (15) of the inner zone.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

L'invention concerne un tuyau de remplissage à utiliser dans un véhicule automobile, contenant une zone extérieure (1) et une zone intérieure (2) venant buter l'une contre l'autre. La zone extérieure (1) contient une seule couche de polyéthylène et la couche intérieure (2) est capable de dissiper l'énergie électrostatique et de bloquer la perméation des hydrocarbures.
PCT/US1999/006565 1998-05-07 1999-05-05 Tuyau de remplissage multicouche pour reservoirs de carburant de vehicules WO1999057473A2 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2000547397A JP2002513902A (ja) 1998-05-07 1999-05-05 自動車用の多層パイプ
CA002331317A CA2331317A1 (fr) 1998-05-07 1999-05-05 Tuyau de remplissage multicouche pour reservoirs de carburant de vehicules
KR1020007012417A KR20010052318A (ko) 1998-05-07 1999-05-05 차량 연료 탱크용 다층 주입관
EP99921352A EP1076791A2 (fr) 1998-05-07 1999-05-05 Tuyau de remplissage multicouche pour reservoirs de carburant de vehicules
AU38589/99A AU3858999A (en) 1998-05-07 1999-05-05 Multi-layer filler pipe for vehicle fuel tanks

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US8456898P 1998-05-07 1998-05-07
US60/084,568 1998-05-07
US30454099A 1999-05-04 1999-05-04
US09/304,540 1999-05-04

Publications (2)

Publication Number Publication Date
WO1999057473A2 true WO1999057473A2 (fr) 1999-11-11
WO1999057473A3 WO1999057473A3 (fr) 2000-01-06

Family

ID=26771128

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/006565 WO1999057473A2 (fr) 1998-05-07 1999-05-05 Tuyau de remplissage multicouche pour reservoirs de carburant de vehicules

Country Status (6)

Country Link
EP (1) EP1076791A2 (fr)
JP (1) JP2002513902A (fr)
KR (1) KR20010052318A (fr)
AU (1) AU3858999A (fr)
CA (1) CA2331317A1 (fr)
WO (1) WO1999057473A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1333211A1 (fr) * 2002-01-30 2003-08-06 Veritas Ag Tube multicouche
EP1754919A1 (fr) * 2005-08-19 2007-02-21 Veritas Ag Tuyau avec couche barrière double

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5537824B2 (ja) * 2009-03-25 2014-07-02 阿波製紙株式会社 自動車用の耐熱コルゲートチューブに使用されるホットメルト剤コーティング無機質紙

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993021466A1 (fr) * 1992-04-14 1993-10-28 Itt Industries, Inc. Tubulure de carburant et de vapeur a plusieurs couches
US5472754A (en) * 1993-02-05 1995-12-05 Nobel Plastiques Multilayer plastics material hose
EP0730115A1 (fr) * 1995-03-01 1996-09-04 Hüls Aktiengesellschaft Tube multicouche comprenant une couche interne électroconductrice
US5566720A (en) * 1995-01-10 1996-10-22 Itt Corporation Elongated fuel and vapor tube having multiple layers and method of making the same
WO1998001694A1 (fr) * 1996-07-08 1998-01-15 Bundy Corporation Ensemble tube multicouche destine a des systemes de traitement de fluide et de vapeur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993021466A1 (fr) * 1992-04-14 1993-10-28 Itt Industries, Inc. Tubulure de carburant et de vapeur a plusieurs couches
US5472754A (en) * 1993-02-05 1995-12-05 Nobel Plastiques Multilayer plastics material hose
US5566720A (en) * 1995-01-10 1996-10-22 Itt Corporation Elongated fuel and vapor tube having multiple layers and method of making the same
EP0730115A1 (fr) * 1995-03-01 1996-09-04 Hüls Aktiengesellschaft Tube multicouche comprenant une couche interne électroconductrice
WO1998001694A1 (fr) * 1996-07-08 1998-01-15 Bundy Corporation Ensemble tube multicouche destine a des systemes de traitement de fluide et de vapeur

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1333211A1 (fr) * 2002-01-30 2003-08-06 Veritas Ag Tube multicouche
US7757721B2 (en) 2002-01-30 2010-07-20 Veritas Ag Multilayer pipe
EP1754919A1 (fr) * 2005-08-19 2007-02-21 Veritas Ag Tuyau avec couche barrière double
WO2007019921A1 (fr) * 2005-08-19 2007-02-22 Veritas Ag Corps creux dote d'une double couche barriere

Also Published As

Publication number Publication date
WO1999057473A3 (fr) 2000-01-06
EP1076791A2 (fr) 2001-02-21
KR20010052318A (ko) 2001-06-25
AU3858999A (en) 1999-11-23
JP2002513902A (ja) 2002-05-14
CA2331317A1 (fr) 1999-11-11

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