WO2007139369A2 - Câble coaxial à faible coefficient de frottement superficiel et procédé de fabrication de celui-ci - Google Patents

Câble coaxial à faible coefficient de frottement superficiel et procédé de fabrication de celui-ci Download PDF

Info

Publication number
WO2007139369A2
WO2007139369A2 PCT/MX2007/000065 MX2007000065W WO2007139369A2 WO 2007139369 A2 WO2007139369 A2 WO 2007139369A2 MX 2007000065 W MX2007000065 W MX 2007000065W WO 2007139369 A2 WO2007139369 A2 WO 2007139369A2
Authority
WO
WIPO (PCT)
Prior art keywords
cover
coaxial cable
lubricating agent
shield
insulation
Prior art date
Application number
PCT/MX2007/000065
Other languages
English (en)
Spanish (es)
Other versions
WO2007139369A3 (es
Inventor
Patricio Gerardo MURGA GONZÁLEZ
Sergio Arturo Montes Valdez
José RANC GÓMEZ
Héctor Ricardo LÓPEZ GONZÁLEZ
Walter Hugh Reeker Martinez
Original Assignee
Conductores Monterrey, S.A. De C.V.
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 Conductores Monterrey, S.A. De C.V. filed Critical Conductores Monterrey, S.A. De C.V.
Publication of WO2007139369A2 publication Critical patent/WO2007139369A2/fr
Publication of WO2007139369A3 publication Critical patent/WO2007139369A3/es

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1878—Special measures in order to improve the flexibility
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/016—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing co-axial cables
    • H01B13/0165—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing co-axial cables of the layers outside the outer conductor

Definitions

  • This invention relates to the field of coaxial cables and more precisely, to a coaxial cable of low coefficient of surface friction that has a cover that incorporates at least one lubricating agent that migrates to its outer surface, and likewise refers to a method of manufacturing said coaxial cable.
  • coaxial cable is used to transmit high frequency signals, such as data, voice and television signals, the latter commonly known as cable television (CATV).
  • CATV cable television
  • the coaxial cable is generally formed by a central conductor, an insulation, an outer shield or conductor and an outer cover.
  • the central conductor can be formed by a wire or cable, commonly made of copper, aluminum, steel coated with aluminum or copper; and which in turn is coated with an insulation, generally made of one or more dielectric layers of polyethylene-based plastic material, or mixtures of polyethylene, solid or foamed.
  • the insulation is surrounded by an outer shield or conductor commonly formed by a metallic tape and a metal mesh.
  • the metallized tape is applied in a helical or longitudinal manner and is substantially formed by a thin aluminum foil adhered to a layer of polymer; while the metal mesh is normally formed by a plurality of thin metal wires of copper, aluminum or tinned applied helically or as a braided mesh.
  • the shield or outer conductor in addition to serving as an electric conductor, also serves as a protective shield of coaxial cable against the loss or dispersion of radiation from the transmitted radio frequency.
  • the outer cover fulfills the functions of mechanical protection against the external environment.
  • covers based on polyvinyl chloride (PVC) are used due to their excellent properties of resistance to the environment, sunlight, chemical agents, the propagation of the flame and moisture.
  • PVC polyvinyl chloride
  • the outer shell in addition to providing mechanical protection to the coaxial cable against the outside environment, also provides mechanical rigidity to the outer shield or conductor in order to maintain the metal wires of the metal mesh, as well as the same metal mesh and the metallic cover in electrical contact uniformly along the length of the coaxial cable.
  • the outer sheath generally has a high coefficient of friction that causes problems during the installation of the coaxial cable.
  • the shape and composition of the outer surface of the coaxial cable cover determines the ease with which the coaxial cable can be pushed or pulled through and in contact with another surface, such as, for example, the outer surface of the cover of another cable or the surface of the internal wall of a conduit in which the coaxial cable is or will be installed.
  • a coaxial cable is installed in a conduit, such as a tube, which may or may not contain other cables, such as coaxial cables, fiber optic cables or electrical power cables.
  • the friction between a coaxial cable and another surface that the coaxial cable contacts resists the movement of the coaxial cable and holds the coaxial cable, or its internal components, to tension when moving the coaxial cable with respect to the surface.
  • the value of the tension that is imposed on the coaxial cable increases as the length of the cable that is subjected to friction increases.
  • the tension on the coaxial cable generated by the friction can cause damage to the rigidity and mechanical integrity of the cable or damage the components of the coaxial cable damaging its electrical-dielectric qualities thereof. For example, if a pulling force that is too large is applied to a coaxial cable during its installation as a result of the friction that occurs over a long section of the coaxial cable that stretches over another surface, the coaxial cable can be stretched further. beyond an allowable extension. This undue elongation can cause breakage or fractures, both in the central conductor, insulation, shielding or external conductor and in the same external cover that severely damage the electrical, dielectric and mechanical capacity thereof.
  • a lubricant composition for electric cable that includes an aqueous solution of 1% to 4% of a water soluble cellulose derivative, such as carboxymethyl cellulose, and 0.5% to 2% polyacrylamide.
  • the lubricant may be presented in liquid or gel form.
  • Nobuhiro Fujio and Akihiro Ishihara in Japanese patent JP-9251811, describe a resin composition for cable sheath that has excellent flexibility and low coefficient of friction.
  • the resin composition includes from 0.2 parts by weight to 3 parts by weight of an aliphatic amide and from 55 parts by weight to 90 parts by weight of a liquid plasticizer with respect to 100 parts by weight of any resin, for example PVC.
  • any resin for example PVC.
  • erucilamide is used.
  • Henry Williamson Harcourt Robinson in British patents GB-1175059, GB-1175060 and GB-1230189, describes a low friction electric cable having a cover composed of at least one polyolefin and a lubricating agent, such that the polyolefin can be a polymer or copolymer of ethylene, propylene or butylene, while the lubricating agent can be an amide of fatty acid such as, for example, caprilamide, capramide, lauramide, myristamide, palmitamide, estereamide, oleamide, linoleamide and erucamide.
  • the polyolefin can be a polymer or copolymer of ethylene, propylene or butylene
  • the lubricating agent can be an amide of fatty acid such as, for example, caprilamide, capramide, lauramide, myristamide, palmitamide, estereamide, oleamide, linoleamide and erucamide.
  • KyIe Cope and Tareq Hanque in European Patent Publication EP-0949635, describe a pre-lubricated cable and its manufacturing process.
  • the cable is provided with an external coating and has a layer of non-adhesive lubricating coating that adheres to the outermost surface of the outer shell.
  • the lubricating coating layer is of an organo-polysiloxane release agent, such as polyalkylsiloxane.
  • a coaxial cable in particular a coaxial cable for CATV, with a low coefficient of surface friction that has an outer sheath that incorporates at least one lubricating agent that migrates to its surface, and that has an intermediate cover that prevents said agent lubricant migrates towards the internal components of the coaxial cable, in such a way that the lubricating composition of the external cover maintains a high degree of lubrication, without excessive residues, on the surface of the external cover for a long period of time, including the period of time after the installation of the coaxial cable inside a conduit; that allows the application of connectors; a cover that can withstand the wear associated with abrasive loads ordinarily experienced by a coaxial cable; that is not flammable; that allows printing on the surface of the outer cover of a code pattern and that I continue to have the above qualities after being subjected to a wide range of temperatures and humidity conditions.
  • a coaxial cable with a low coefficient of surface friction said coaxial cable has a central conductor; an insulation that envelops the central conductor; a shield surrounding the insulation; a first cover that wraps around the shield; and a second cover that envelops the first cover; such that the second cover incorporates at least one lubricating agent that migrates towards the external surface of the coaxial cable; and the first cover prevents the lubricating agent from migrating towards the shield.
  • the object of the invention to offer a method of manufacturing a coaxial cable with a low coefficient of surface friction, the method has the steps of extruding an insulation around a central conductor; wrap the insulation with a shield; extrude a first cover around the shield; and co-extrude a second cover around the first cover; such that the second cover incorporates at least one lubricating agent that migrates towards the external surface of the coaxial cable; and the first cover prevents the lubricating agent from migrating towards the shield.
  • Figure 1 illustrates a perspective view in section of a coaxial cable according to the invention.
  • Figure 2 illustrates a block diagram of a method of manufacturing a coaxial cable according to the invention.
  • a coaxial cable 10 generally formed by a central conductor 20, an insulation 30, a shield 40 (also known as an external conductor), a first cover 70 and a second cover 80.
  • the central conductor 20 is formed by a metal wire or cable which in turn is surrounded by the envelope insulation 30, generally made of one or more dielectric layers of one or more plastic materials based on polyethylene or other dielectric material.
  • the insulation 30 is surrounded by the shield 40 which is generally formed by one or more metalized tapes 50 and by one or more metal meshes 60.
  • the metallic tape 50 is applied helically or longitudinally and is substantially formed by a lamella thin aluminum bonded to a polymer layer; while the metal mesh 60 is normally formed by a plurality of thin metal wires applied helically or as a braided mesh.
  • the first cover 70 which surrounds the shield 40, mechanically protects the coaxial cable 10 against the outside environment and maintains the mechanical rigidity thereof and serves as a protective barrier that prevents the lubricating composition, which is described later, from migrating into the interior of the coaxial cable 10 in order to avoid damage to the electrical, dielectric and mechanical qualities thereof.
  • the first cover 70 is generally made of one or more layers of polymer-based plastic material such as, for example, polyethylene, polypropylene, polyvinylchloride, vinyl chloride copolymers with vinyl acetate, ethylene copolymers with an alpha-olefin or with a saturated ester, fluoropolymers, chlorinated polymers, vinylidene polychloride, polyamides, acrylic polymers, polyesters, ionic hydrocarbon polymers and mixtures thereof.
  • polymer-based plastic material such as, for example, polyethylene, polypropylene, polyvinylchloride, vinyl chloride copolymers with vinyl acetate, ethylene copolymers with an alpha-olefin or with a saturated ester, fluoropolymers, chlorinated polymers, vinylidene polychloride, polyamides, acrylic polymers, polyesters, ionic hydrocarbon polymers and mixtures thereof.
  • Envelope in the first outer cover 70 is a second cover 80 that has a low coefficient of friction by incorporating a lubricating agent that migrates towards the surface of said cover.
  • Said lubricating agent is incorporated into the polymer-based plastic material such as, for example, polyethylene, polypropylene, polyvinylchloride, vinyl chloride copolymers with vinyl acetate, ethylene copolymers with an alpha-olefin or with a saturated ester, fluoropolymers, chlorinated polymers, vinylidene polychloride, polyamides, acrylic polymers, polyesters ,. ionic hydrocarbon polymers and mixtures thereof.
  • the low coefficient of friction on the surface of the second cover 80 is the result of the migration of the lubricating agent towards the surface of said cover due to the incompatibility defined between the lubricating agent and the polymer used in the composition of the cover.
  • the migration rate of the lubricating agent towards the surface of said cover is the result of the migration of the lubricating agent towards the surface of said cover due to the incompatibility defined between the lubricating agent and the polymer used in the composition of the cover.
  • the surface is generally defined by the length of the chain of the lubricating agents (compatibility with the polymer) and by the characteristics of the polymer, including their crystallinity. The larger the chain of the lubricating agent is
  • lubricating agents preferably employed in the invention, we have those based on fatty acid amides such as, for example, oleamide, erucamide, caprilamide, capramide, lauramide, palmitamide, stearamide, linoleamide, myristamide and mixtures thereof. More preferably oleamide and erucamide within a range of 0.25% by weight to 1.0% by weight in relation to the final composition to form said second cover 80.
  • a characteristic of the second cover 80 is. which must have a thickness much less than the thickness of the first cover 70, so that the greater amount of lubricating agent incorporated in the second cover 80 only tends to migrate towards the external surface and that that amount of lubricating agent that arrives to migrate towards the internal surface in contact with the first cover 70 is dissipated in this cover, without subsequently migrating to the shield.
  • the first cover preferably has a thickness in a range of 0.5 mm to 1.1 mm; while the second cover has a thickness preferably in a range of 0.05 mm to 0.25 mm.
  • the second cover 80 may have on its surface a first printed code pattern (not shown), formed by a sequence based on characters, symbols, numbers, visual patterns based on colors and / or combinations of all of these and that together they serve to identify, for example, the type of coaxial cable, its physical and electrical characteristics, the manufacturing company thereof, the company that owns and provides CATV signals, among other data.
  • This pattern of printed code is not affected by the lubricating agent that migrates to the surface of the cover 80.
  • samples of coaxial cable for CATV type RG-59 were first manufactured having a single cover made of PVC, to which increasing amounts of oleamide were added.
  • the tensile force exerted on each of the samples of said cable that was passed, at a speed of 600 mm / min was measured through a commercial polyethylene conduit of 0.8 m long and with a 90 ° elbow placed at half of said length. It should be mentioned that the tensile force, measured for each sample, corresponds to the force necessary to pull the coaxial cable in order to pass it through the polyethylene conduit.
  • Table 1 shows the characteristics and results obtained from the samples of coaxial cable type RG-59 with a single cover, in which it is observed that when the amount of oleamide is increased, the tensile strength decreases, for example, when the concentration of oleamide is 0.5% by weight of the cover, the effect is only marginal; while when the concentration is 1% the friction is considerably reduced.
  • the coaxial cable of the sample, with the cover containing 1% by weight of oleamide could not be connected satisfactorily to the connector, since it was found that the cover did not show any adhesion with the shield because the oleamide had migrated towards it.
  • a series of coaxial cable samples were manufactured with a first cover consisting of a flexible polyvinyl chloride compound suitable for use in covers of the coaxial cables of the invention.
  • a second cover was placed on top of the first cover, consisting of the same material as the first cover, but containing several concentrations of at least one lubricating agent.
  • the lubricating agents contemplated in the study are oleamide and erucamide.
  • the thickness of the second roof was also systematically varied. The results obtained from these samples are illustrated in Table 2.
  • Table 3 illustrates the results of the average tensile strength and standard deviation obtained for each sample for the 25 determinations.
  • the erucamide is more effective in reducing the tension force while a higher concentration of it tends to reduce even more the friction between the external surface of the second cable sheath and the internal surface of the polyethylene duct.
  • storage simulation studies were carried out under various temperature conditions. Samples E, H and J were stored in a cold room, whose temperature was maintained at 15 0 C, at room temperature (23 0 C) and in a hot room with a controlled temperature of 36 0 C. After 2 months in these conditions, the samples were removed, conditioned at room temperature for 24 hours to subsequently test the tensile strength.
  • samples D, F, G, H were selected and J to carry out a study of tension and connection force after 2 months of storage at room temperature.
  • the results, shown in Table 5, indicate that the measurements of the tensile force at 0 and 2 months of storage are comparable. It should be mentioned that these samples were successfully connected after 2 months of being manufactured and conditioned at room temperature. This means that the ease of sliding of the second cover remains stable over time regardless of the lubricating agent and thickness of the second cover.
  • step 1OO by applying insulation on a conductor by means of extrusion; proceeding, in step 110, to wrap the insulation with a shield, such that the shield consists of first wrapping the insulation with a metallized tape, then wrapping the metallized tape with a metal mesh; in step 120, for extrusion medium, the shield is wrapped with a first cover; immediately step 140 a second cover is applied by means of a co-extrusion stage on the first cover, such that the second cover incorporates a lubricating agent that was previously mixed, in step 130, with the plastic composition to form it .
  • the second cover is co-extruded to the first cover with a thickness much smaller than the thickness of the first cover.
  • code 150 a code pattern is applied on the surface of the second cover.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Communication Cables (AREA)

Abstract

L'invention concerne un câble coaxial à faible coefficient de frottement superficiel, ledit câble coaxial comprenant un conducteur central, un isolant entourant le conducteur central, un blindage entourant l'isolant, un premier revêtement entourant le blindage et un second revêtement entourant le premier revêtement. Le second revêtement incorpore au moins un agent lubrifiant à base d'amide d'acide gras, tel que, par exemple, l'oléamide et l'érucamide, qui migre vers la surface externe du câble coaxial, le premier revêtement empêchant l'agent lubrifiant de migrer vers le blindage. Le second revêtement présente une épaisseur inférieure à l'épaisseur du premier revêtement permettant à la quantité d'agent lubrifiant pouvant migrer jusqu'au premier revêtement de se dissiper dans celui-ci sans passer dans le blindage. L'invention concerne également un procédé de fabrication du câble coaxial à faible coefficient de frottement superficiel. Ledit procédé consiste à extruder un isolant autour d'un conducteur central, à recouvrir l'isolant d'un blindage, et à coextruder un second revêtement autout du premier revêtement, de manière que le second revêtement incorpore au moins un agent lubrifiant qui migre vers la surface externe du câble coaxial, le premier revêtement empêchant l'agent lubrifiant de migrer vers le blindage.
PCT/MX2007/000065 2006-05-26 2007-05-25 Câble coaxial à faible coefficient de frottement superficiel et procédé de fabrication de celui-ci WO2007139369A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MXNL/A/2006/000033 2006-05-26
MXNL06000033 MXNL06000033A (es) 2006-05-26 2006-05-26 Cable coaxial de bajo coeficiente de friccion superficial y metodo de fabricacion del mismo.

Publications (2)

Publication Number Publication Date
WO2007139369A2 true WO2007139369A2 (fr) 2007-12-06
WO2007139369A3 WO2007139369A3 (es) 2009-04-23

Family

ID=38779106

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/MX2007/000065 WO2007139369A2 (fr) 2006-05-26 2007-05-25 Câble coaxial à faible coefficient de frottement superficiel et procédé de fabrication de celui-ci

Country Status (2)

Country Link
MX (1) MXNL06000033A (fr)
WO (1) WO2007139369A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103943203A (zh) * 2014-02-28 2014-07-23 安徽幸福电器电缆有限公司 一种led屏用抗老电线
US9093194B2 (en) 2009-07-16 2015-07-28 3M Innovative Properties Company Insulated composite power cable and method of making and using same

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4356139A (en) * 1980-12-12 1982-10-26 Southwire Company Method for lubricating cable in a dry curing system
US5036121A (en) * 1988-09-06 1991-07-30 The B. F. Goodrich Company Flame and smoke retardant cable insulation and jacketing compositions
US5519172A (en) * 1994-09-13 1996-05-21 W. L. Gore & Associates, Inc. Jacket material for protection of electrical conductors
US5912436A (en) * 1996-08-09 1999-06-15 Servicios Condumex S.A. De C.V. Co-extruded electric conductor cable in three insulating layers of low humidity absorption electric method low smoke and toxic gas emission flame retardant
US6159617A (en) * 1995-03-29 2000-12-12 Univation Technologies, Llc Ethylene polymers having superior clarity enhanced toughness, low extractables, and processing ease
US20020043391A1 (en) * 2000-08-31 2002-04-18 Kazunori Suzuki Self-lubricating enameled wire
US6416813B1 (en) * 1998-08-19 2002-07-09 Pirelli Cables Y Sistemas, S.A. Method of manufacturing an electrical cable having a reduced coefficient of friction
US6596393B1 (en) * 2000-04-20 2003-07-22 Commscope Properties, Llc Corrosion-protected coaxial cable, method of making same and corrosion-inhibiting composition
US7084343B1 (en) * 2005-05-12 2006-08-01 Andrew Corporation Corrosion protected coaxial cable

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4356139A (en) * 1980-12-12 1982-10-26 Southwire Company Method for lubricating cable in a dry curing system
US5036121A (en) * 1988-09-06 1991-07-30 The B. F. Goodrich Company Flame and smoke retardant cable insulation and jacketing compositions
US5519172A (en) * 1994-09-13 1996-05-21 W. L. Gore & Associates, Inc. Jacket material for protection of electrical conductors
US6159617A (en) * 1995-03-29 2000-12-12 Univation Technologies, Llc Ethylene polymers having superior clarity enhanced toughness, low extractables, and processing ease
US5912436A (en) * 1996-08-09 1999-06-15 Servicios Condumex S.A. De C.V. Co-extruded electric conductor cable in three insulating layers of low humidity absorption electric method low smoke and toxic gas emission flame retardant
US6416813B1 (en) * 1998-08-19 2002-07-09 Pirelli Cables Y Sistemas, S.A. Method of manufacturing an electrical cable having a reduced coefficient of friction
US6596393B1 (en) * 2000-04-20 2003-07-22 Commscope Properties, Llc Corrosion-protected coaxial cable, method of making same and corrosion-inhibiting composition
US20020043391A1 (en) * 2000-08-31 2002-04-18 Kazunori Suzuki Self-lubricating enameled wire
US6534717B2 (en) * 2000-08-31 2003-03-18 Hitachi Cable, Ltd. Self-lubricating enameled wire
US7084343B1 (en) * 2005-05-12 2006-08-01 Andrew Corporation Corrosion protected coaxial cable

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9093194B2 (en) 2009-07-16 2015-07-28 3M Innovative Properties Company Insulated composite power cable and method of making and using same
CN103943203A (zh) * 2014-02-28 2014-07-23 安徽幸福电器电缆有限公司 一种led屏用抗老电线

Also Published As

Publication number Publication date
MXNL06000033A (es) 2007-11-26
WO2007139369A3 (es) 2009-04-23

Similar Documents

Publication Publication Date Title
KR100522386B1 (ko) 부식-방지된 동축 케이블, 그의 제조 방법 및 부식-억제조성물
US7411132B1 (en) Water blocking electrical cable
CA2542986C (fr) Procede continu servant a fabriquer des cables electriques
JP3723738B2 (ja) シールドケーブル及びその製造方法
MXPA02005475A (es) Pieza ranurada separadora de cable.
US8452142B1 (en) Railway deployable composite communication cable
JP6637404B2 (ja) 耐水性難燃ノンハロゲンシース高圧ケーブル
CN102664073A (zh) 舰船用低烟无卤低毒数字信号超五类防鼠通信电缆
WO2007139369A2 (fr) Câble coaxial à faible coefficient de frottement superficiel et procédé de fabrication de celui-ci
CN203689940U (zh) 一种轻型、耐寒、抗拉、耐磨、阻燃环保型信号软电缆
CN207602281U (zh) 一种阻燃阻水低压电力电缆
CN217361187U (zh) 聚乙烯绝缘低压多芯屏蔽控制电缆
CN203760111U (zh) 高强度、高阻水轨道交通用乙丙橡胶绝缘直流软电缆
CN104867551A (zh) 一种采煤机引流软电缆
CN210692140U (zh) 一种水下直流系统移动用耐寒防腐蚀脐带电缆
ES2452520T3 (es) Elemento de cable, cable para transmisión de datos, procedimiento para la fabricación y utilización del cable para transmisión de datos
RU181902U1 (ru) Влагонепроницаемый кабель связи
CN105529092A (zh) 一种镀银铝塑镍带聚氯乙烯绝缘电缆
CN213241985U (zh) 一种环保防水高承压电缆
CN216980134U (zh) 一种防水型金属铜套柔性矿物绝缘防火电缆
CN206961591U (zh) 基于阻水的中压单芯电缆
CN217485129U (zh) 一种灌溉电缆
CN218513196U (zh) 耐油型柔性卷绕软电缆
CN110648799B (zh) 一种用于智慧城市地下缆线管廊中的综合线缆制造方法
CN217214196U (zh) 一种矿物绝缘防火电缆

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07747211

Country of ref document: EP

Kind code of ref document: A2

NENP Non-entry into the national phase in:

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 07747211

Country of ref document: EP

Kind code of ref document: A2