DK142186B - Process for producing an electric cable with easily separable semiconducting and insulating layers. - Google Patents
Process for producing an electric cable with easily separable semiconducting and insulating layers. Download PDFInfo
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- DK142186B DK142186B DK500474AA DK500474A DK142186B DK 142186 B DK142186 B DK 142186B DK 500474A A DK500474A A DK 500474AA DK 500474 A DK500474 A DK 500474A DK 142186 B DK142186 B DK 142186B
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- semiconducting
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- electric cable
- polyethylene
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
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- 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
- H01B13/0026—Apparatus for manufacturing conducting or semi-conducting layers, e.g. deposition of metal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
- H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Insulating Materials (AREA)
- Manufacturing Of Electric Cables (AREA)
- Conductive Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Insulated Conductors (AREA)
Description
(11) FREMLÆGGELSESSKRIFT 142186 DANMARK (51) mt. Cl.3 H 01 B 9/02 // H 01 B 3/18 §(21) Ansøgning nr. 5004/7^· (22) Indleveret den 2k. S ep. 1974 (24) Løbedeg 2b. ββρ. 197^ (44) Ansøgningen fremlagt og fremlæggelsesskrrftet offentliggjort den 15· S ©P · 1 980(11) PUBLICATION MANUAL 142186 DENMARK (51) mt. Cl.3 H 01 B 9/02 // H 01 B Section 3/18 (21) Application No. 5004/7 ^ · (22) Filed on 2k. S ep. 1974 (24) Race stage 2b. ββρ. 197 ^ (44) The application presented and the disclosure published on 15 · S © P · 1 980
Dl REKTORATET FOR . . , . .Dl THE RECTORATE FOR. . ,. .
PATENT-OG VAREMÆRKEVÆSENET (30) Prioritet begæret fra denPATENT AND TRADE MARKET (30) Priority requested from it
25. sep. 1975, 733^298, FRSep 25 1975, 733 ^ 298, FR
(71)TH0MS0N-BRANDT, 173, Bl. Haussraann, 75008 Paris, FR.(71) TH0MSON-BRANDT, 173, Bl. Haussraann, 75008 Paris, FR.
(72)Opfinder: Bernard Grison, 11, rue Henri Barbusse, 02200 Bohaln, FR.(72) Inventor: Bernard Grison, 11, rue Henri Barbusse, 02200 Bohaln, FR.
(74) Fuldmægtig under sagens behandling:(74) Plenipotentiary in the proceedings:
Ingeniørfirmaet Hofman-Bang & Boutard.Hofman-Bang & Boutard Engineering Company.
(54) Fremgangsmåde til fremstilling af et elektrisk kabel med let separer= bare halvledende og Isolerende lag.(54) Method of producing an electric cable with light separator = bare semiconductor and insulating layer.
Den foreliggende opfindelse angår en fremgangsmåde til fremstilling af isolerede elektriske kabler af den i kravets indledning anførte art.The present invention relates to a method of manufacturing insulated electrical cables of the kind set forth in the preamble of claim.
Isolerede elektriske kabler til brug ved middelhøje spændinger er oftest indefra og udefter opbygget af en sjæl af kobber eller aluminium, et første lag af halvledende materiale, et elektrisk isolerende materiale, et andet lag af halvledende materiale, en metalskærm, der sikrer en afledning af eventuelle kortslutningsstrømme og en beskyttelseskappe af plastmateriale.Insulated electrical cables for use at medium voltages are most often built from the inside and the outside by a copper or aluminum soul, a first layer of semiconducting material, an electrical insulating material, a second layer of semiconducting material, a metal shield to ensure any conduction short-circuit currents and a protective cover made of plastic material.
Under behandlingen af sådanne kabler for at opnå en samling eller en forgrening er det nødvendigt at adskille det andet lag af halvleden- 2 142186 de materiale fra det isolerende lag efter at have fjernet beskyttelseskappen og metalskærmen. Denne adskillelse er vanskelig, med mindre de to lag kun har en svag indbyrdes vedhængning.During the processing of such cables to obtain a joint or branch, it is necessary to separate the second layer of the semiconductor material from the insulating layer after removing the protective cap and metal shield. This separation is difficult, unless the two layers only have a weak interdependence.
Når man som isolationsmateriale i et elektrisk kabel anvender et materiale med tværbindinger, såsom kemisk tværbundet polyethylen, tværbundne ethylen-copolymer e eller ethylen-propylen-kaut s juk, kan man forestille sig i det samme kabel som halvledende lag at anvende et materiale på basis af de nævnte materialer, der er gjort halvledende ved tilsætning af ledende kønrøg, som det er sædvanligt indenfor kabelindustrien.When using as an insulating material in an electrical cable, a material having cross-links, such as chemically cross-linked polyethylene, cross-linked ethylene copolymer or ethylene-propylene cable yoke, it is envisaged in the same cable as semi-conductive layers to use a material based on of said materials made semi-conductive by the addition of conductive carbon black, as is customary in the cable industry.
Dette medfører imidlertid en vis ulempe ved fremstillingen af kablet. Por at undgå en for stærk vedhængning mellem det isolerende lag og det halvledende lag er man således tvunget til først at anbringe og tværbinde det isolerende lag, og derpå at anbringe og tværbinde det halvledende lag, eftersom en simultanextrudering af det isolerende og halvledende lag efterfulgt af en tværbinding af samlingen af lag medfører en så stærk vedhængning mellem de to lag, at det praktisk talt er umuligt at separere dem.However, this causes some disadvantage in the manufacture of the cable. Thus, in order to avoid too strong adhesion between the insulating layer and the semiconducting layer, one is forced to first apply and cross-link the insulating layer, and then to apply and cross-link the semiconducting layer, since a simultaneous extrusion of the insulating and semiconducting layer followed by a crosslinking of the joint of layers results in such strong adhesion between the two layers that it is practically impossible to separate them.
I USA patentskrift nr. 3 541 228 beskrives et elektrisk kabel, hvori de tilstødende isolerende og halvledende lag er let separerbare. Formålet med den i nævnte USA patentskrift beskrevne opfindelse er, i lighed med den foreliggende opfindelse, at tilvejebringe en let separering af isolationslag og tilstødende halvledende lag, men problemets løsning tilvejebringes på en anden måde. Således er isolationslaget fremstillet ud fra en tværbundet olefin-copolymer, og det halvledende lag er fremstillet ud fra et ikke-vulkaniseret materiale, der er opnået ved dispersion af kønrøg i chlorsulfoneret polyethylen.U.S. Patent No. 3,541,228 discloses an electrical cable in which the adjacent insulating and semiconducting layers are readily separable. The object of the invention disclosed in said United States patent is, like the present invention, to provide an easy separation of insulation layers and adjacent semiconducting layers, but the solution of the problem is provided in a different way. Thus, the insulation layer is made from a crosslinked olefin copolymer and the semiconducting layer is made from a non-vulcanized material obtained by dispersing carbon black into chlorosulfonated polyethylene.
Det nævnte halvledende lag kan først være extruderet eller påført ved vikling af et bånd direkte på kabelsjælen, hvorefter det dækkes med et extruderet isolationslag. Samlingen af lag underkastes en termisk behandling til samtidig gennemførelse af to operationer, nemlig en tværbinding af isolationslaget og en tilpasning under tryk af de halvledende lag mod isolationslaget og kabelsjælen. Alternativt kan det halvledende lag extruderes på en allerede isoleret leder.Said semiconducting layer may first be extruded or applied by winding a strip directly onto the cable sheave and then covered with an extruded insulation layer. The assembly of layers is subjected to a thermal treatment for simultaneous execution of two operations, namely, a cross-linking of the insulation layer and an adaptation under pressure of the semiconducting layers against the insulation layer and the cable soul. Alternatively, the semiconducting layer can be extruded onto an already insulated conductor.
Den gode kontakt mellem de tilstødende overflader af isolationslaget og det halvledende lag opnås ved en termisk behandling, der enten foretages på det tidspunkt, hvor lagene anbringes, eller efter at 3 142186 disse er anbragt.The good contact between the adjacent surfaces of the insulating layer and the semiconducting layer is achieved by a thermal treatment, either made at the time the layers are applied or after they have been applied.
USA patentskrift nr. 3 646 248 beskriver ligeledes et elektrisk kabel med et isolationslag og et halvledende lag, der let kan separeres.U.S. Patent No. 3,646,248 also discloses an electrical cable having an insulation layer and a semiconducting layer that can be easily separated.
Her består såvel isolationslaget som det halvledende lag imidlertid af olefiniske terpolymere, og disse tværbindes med forskellige midler, idet isolationslaget tværbindes med et organisk peroxid, mens det halvledende lag tværbindes med svovl.Here, however, both the insulation layer and the semiconducting layer consist of olefinic terpolymers, and these are crosslinked by various means, the insulation layer being crosslinked with an organic peroxide, while the semiconducting layer is crosslinked with sulfur.
Et elektrisk kabel med let separerbare lag er endvidere beskrevet i USA patentskrift nr.3 719 769· Her består isolationslaget af tværbundet polyethylen eller polyethylen-copolymer, mens det halvledende lag består af en copolymer ethylen og vinylacetat indeholdende 25-55 vægt-% vinylacetat og 0,2-6 vægtdele af et specifikt tværbindingsmiddel.An electrical cable with readily separable layers is further described in U.S. Patent No. 3,719,769. Here, the insulating layer consists of cross-linked polyethylene or polyethylene copolymer, while the semiconducting layer consists of a copolymer of ethylene and vinyl acetate containing 25-55% by weight of vinyl acetate and 0.2-6 parts by weight of a specific crosslinking agent.
Formålet med den foreliggende opfindelser er ved et specifikt materialevalg at tilvejebringe en fremgangsmåde til fremstilling af et elektrisk kabel, hvori det isolerende lag og det tilstødende halvledende lag er let separerbare, og hvor det halvledende lag ligesom det isolerende lag kan modstå den opvarmning, som skyldes den elektriske strøm, der sendes igennem kablet under normal drift, samt de uønskede opvarmninger, der sker på grund af kortslutninger.The object of the present invention is to provide, by a specific choice of material, a method of producing an electric cable in which the insulating layer and the adjacent semiconducting layer are readily separable and the semiconducting layer, like the insulating layer, can withstand the heating caused by the electrical current sent through the cable during normal operation, as well as the undesired heating that occurs due to short circuits.
Dette opnås ved fremgangsmåden ifølge opfindelsen, der er ejendommelig ved det i kravets kendetegnende del anførte. Anvendelsen af denne materialekombination er ikke tidligere beskrevet og fører, som påvist nedenfor, til kabler, hvor lagene særdeles let separeres.This is achieved by the method according to the invention, which is characterized by the characterizing part of the claim. The use of this combination of materials has not been previously described and, as demonstrated below, leads to cables where the layers are very easily separated.
Opfindelsen illustreres nærmere ved nedenstående eksempler på fremstilling af elektriske kabler, hvor eksempel 1, 2 og 6 angår kendte elektriske kabler, hvis væsentligste ulempe viser sig ved en manglende separerbarhed mellem det isolerende og det tilstødende halvledende lag, mens de tre øvrige eksempler angår elektriske kabler fremstillet ifølge opfindelsen, hvor det isolerende og halvledende lag let kan adskilles fra hinanden, selv om de er anbragt og tværbundet samtidigt.The invention is further illustrated by the following examples of the manufacture of electrical cables, wherein Examples 1, 2 and 6 relate to known electrical cables, the main disadvantage of which is the lack of separability between the insulating and the adjacent semiconducting layer, while the other three examples relate to electric cables. made according to the invention, wherein the insulating and semiconducting layer can be easily separated from each other, even though they are arranged and cross-linked simultaneously.
4 142186 EKSEMPEL 1EXAMPLE 1
Ved fremstilling af et kendt elektrisk kabel anvender man et halvledende materiale med følgende sammensætning (i vægtdele): EDFM-kautsjuk (ethylen-propylen-dien-monomer) 100In the manufacture of a known electrical cable, a semiconducting material having the following composition (in parts by weight) is used: EDFM rubber (ethylene-propylene-diene monomer) 100
Ledende kønrøg 60Conductive carbon black 60
Naphthenolie 20Naphthenic oil 20
Kridt 90Chalk 90
Zinkoxid 5Zinc oxide 5
Organisk peroxid 5Organic peroxide 5
Forbindelserne blandes i et blandingsorgan på en måde, der er sædvanlig indenfor kautsjukindustrien. Dette halvledende materiale ex-truderes på en metalsjæl sammen med et isolerende materiale på basis af polyethylen, der som tværbindingsmiddel indholder peroxid, for henholdsvis at udgøre et halvledende og et isolerende lag. Efter en varmebehandling ved ca. 180° C i ca. 20 minutter er de to lag stærkt sammensvejsede indbyrdes. Det er praktisk talt umuligt at adskille dem.The compounds are mixed in a mixing means in a manner customary in the rubber industry. This semiconducting material is extruded onto a metal shell together with a polyethylene-based insulating material containing peroxide as a crosslinking agent to form a semiconducting and an insulating layer, respectively. After a heat treatment at approx. 180 ° C for approx. For 20 minutes, the two layers are strongly interlaced. It is practically impossible to separate them.
Man kunne forestille sig, at denne vedhængning skyldes, at tværbindingssystemet er det samme, og at man, hvis man vulkaniserede det halvledende lag ved en anden fremgangsmåde end ved hjælp af peroxid, ville opnå en stærkt nedsat vedhængning.It is conceivable that this adhesion is due to the fact that the crosslinking system is the same and that, if vulcanized the semiconducting layer by a method other than peroxide, a greatly reduced adhesion would be obtained.
EKSEMPEL 2EXAMPLE 2
Ved en anden fremstilling af et elektrisk kabel anvendtes følgende halv-ledende materiale: EPDM-kautsjuk 100In another manufacture of an electric cable, the following semi-conductive material was used: EPDM rubber 100
Ledende kønrøg 60Conductive carbon black 60
Naphthenolie . 20Naphthen oil. 20
Zinkoxid 5Zinc oxide 5
Svovl 1,5Sulfur 1.5
Mercapto-benzothiazol 0,5Mercapto-benzothiazole 0.5
Te trame thylthiuramdi sulfi d 1,5Te trame thylthiuramdi sulfi d 1.5
Man foretager som i eksempel 1 en simultanextrudering af dette halvledende materiale og et isolerende materiale på basis af polyethylen 5 142186 indeholdende et tværbindingsmiddel på en metalsjæl til dannelse af henholdsvis et halvledende og et isolerende lag, hvorpå man foretager en varmebehandling af lagene. De opnåede to lag kan praktisk talt ikke adskilles fra hinanden, selv om det halvledende lag består af et materiale på basis af EPDM-kautsjuk, der indeholder dobbeltbindinger og er vulkaniserbart ved hjælp af svovl.As in Example 1, a simultaneous extrusion of this semiconducting material and an insulating material based on polyethylene 5 142186 containing a crosslinking agent on a metal shell is formed to form a semiconducting and an insulating layer, respectively, and then heat treating the layers. The two layers obtained are virtually indistinguishable from each other, although the semiconducting layer consists of a material of EPDM rubber containing double bonds and is vulcanizable by sulfur.
EKSEMPEL 3EXAMPLE 3
Ved fremstillingen af et elektrisk kabel ved fremgangsmåden ifølge opfindelsen fremstiller man et halvledende materiale med følgende sammensætning (i vægtdele):In the manufacture of an electric cable by the method according to the invention, a semiconducting material having the following composition (in parts by weight) is prepared:
Chlorsulfoneret polyethylen 100Chlorosulfonated polyethylene 100
Ledende kønrøg 60Conductive carbon black 60
Kridt 90Chalk 90
Naphthenolie 40Naphthenic oil 40
Blyoxid 15Lead oxide 15
Nikkel-dibutyl-dithiocarbamat 1Nickel dibutyl dithiocarbamate 1
Tetramethylthiuramdisulfid 0,5Tetramethylthiuram disulfide 0.5
Mercaptobenzothiazildisulfid 0,5Mercaptobenzothiazil disulfide 0.5
Bis-maleimid 2,5Bis-maleimide 2.5
Man foretager som i eksempel 1 en simultanextrudering af denne blanding og et isolerende materiale på basis af polyethylen eller ethylen-copolymere indeholdende et tværbindingsmiddel på en metalsjæl til dannelse af henholdsvis et halvledende lag og et isolerende lag, samt en varmebehandling af lagene. Vedhængningen mellem de således opnåede to lag var så ringe, at de kunne separeres manuelt.As in Example 1, a simultaneous extrusion of this mixture and an insulating material based on polyethylene or ethylene copolymers containing a cross-linking agent on a metal shell to form a semiconducting layer and an insulating layer, as well as a heat treatment of the layers, are carried out. The adhesion between the two layers thus obtained was so small that they could be separated manually.
Den chlorsulfonerede polyethylen, der har en varmebestandighed i nærheden af varmebestandigheden for ethylen-copolymere, har en struktur, der minder om polyethylen, hvis man kun betragter carbon-hydridskelettet, men er ikke déeto mindre særdeles forskellig derfra. Specielt bevirker tilstedeværelsen af chlor i polymermolekylet, at dette får særlige egenskaber, som ikke genfindes hos copolymere eller homopolymere af ethylen. Disse chlorsulfonerede produkter har faktisk karakter af elastomere, mens polyethylenen har karakter af et formstof.The chlorosulfonated polyethylene, which has a heat resistance in the vicinity of the heat resistance of ethylene copolymers, has a structure similar to polyethylene if only the hydrocarbon backbone is considered, but is not less distinct from it. In particular, the presence of chlorine in the polymer molecule causes it to have special properties which are not found in copolymers or homopolymers of ethylene. These chlorosulfonated products actually have the character of elastomers, while the polyethylene has the character of a plastic.
6 U21866 U2186
De ifølge opfindelsen anvendte halvledende materialer på basis af chlorsulfoneret polyethylen indeholder udover den polymere kønrøg, der gør den halvledende, plastificeringsmidler, inerte fyldstoffer, antioxidanter og vulkaniseringsmidler. Man kan i disse blandinger anvende en blanding af chlorsulfoneret polyethylen med andre polymere valgt blandt polyvinylchlorid (PVC), PVC-nitril-kautsjuk, ni-trilkautsjuk, polychloroprenkauts j uk og naturlig kautsjuk.The semi-conductive materials based on chlorosulfonated polyethylene used according to the invention contain, in addition to the polymeric carbon black which makes the semiconductor, plasticizers, inert fillers, antioxidants and vulcanizers. In these mixtures, a mixture of chlorosulfonated polyethylene with other polymers selected from polyvinyl chloride (PVC), PVC nitrile rubber, nitrile rubber, polychloroprene rubber and natural rubber can be used.
Det halvledende materiale anvendt ved fremgangsmåden ifølge opfindelsen indeholder pr. 100 dele chlorsulfoneret polyethylen: 5 - 60 dele kønrøg 0-30 dele af en eller flere polymere, såsom PVC, nitrilkautsjuk, FVC-nitrilkautsjuk, naturlig kautsjuk eller polychloropren.The semiconducting material used in the process according to the invention contains, by 100 parts of chlorosulfonated polyethylene: 5 - 60 parts of carbon black 0-30 parts of one or more polymers such as PVC, nitrile rubber, FVC nitrile rubber, natural rubber or polychloroprene.
5-60 dele plastificeringsmiddel af jordolie- eller estertypen, 0-5 dele stabiliseringsmiddel og antioxidanter, og 0-5 dele vulkaniseringsmiddel.5-60 parts of petroleum or ester type plasticizer, 0-5 parts of stabilizer and antioxidants, and 0-5 parts of vulcanizing agent.
EKSEMPEL 4EXAMPLE 4
Man fremstiller et halvledende materiale, der består af (vægtdele):A semiconducting material is made up of (parts by weight):
Chlorsulfoneret polyethylen 100Chlorosulfonated polyethylene 100
Polyvinylchlorid 30Polyvinyl chloride 30
Ledende kønrøg 60Conductive carbon black 60
Ditridecyl-phthalat 60Ditridecyl Phthalate 60
Blyoxid 15Lead oxide 15
Bis-maleimid 2,5Bis-maleimide 2.5
Te trarne thylthiuramdisulfid 0,5Thinner thylthiuram disulphide 0.5
Mercaptobenzothiazildisulfid 0,5Mercaptobenzothiazil disulfide 0.5
Nikkel-dibutyl-dithiocarbamat 1Nickel dibutyl dithiocarbamate 1
Man foretager som i eksempel 1 en simultanextrudering af denne blanding og et isolerende materiale på basis af polyethylen indeholdende et tværbindingsmiddel på en metalsjæl til dannelse af henholdsvis et halvledende lag og et isolerende lag, og en påfølgende varmebehandling af lagene. De således opnåede to lag kan let separeres fra hinanden.As in Example 1, a simultaneous extrusion of this mixture and an insulating material based on polyethylene containing a cross-linking agent on a metal shell are formed to form a semiconducting layer and an insulating layer, respectively, and a subsequent heat treatment of the layers. The two layers thus obtained can be easily separated from each other.
7 142186 EKSEMPEL 5EXAMPLE 5
Man fremstiller et halvledende materiale bestående af (vægtdele):A semiconducting material is made up of (parts by weight):
Chlorsulfoneret polyethylen 100Chlorosulfonated polyethylene 100
Nitrilkautsjuk 15Nitrile rubber 15
Polyvinylchlorid 15Polyvinyl chloride 15
Ledende kønrøg 60Conductive carbon black 60
Ditridecylphthalat 60Ditridecylphthalate 60
Blyoxid 15Lead oxide 15
Bis-maleimid 2,5Bis-maleimide 2.5
Tetramethylthiuram-disulfid 0,5Tetramethylthiuram disulfide 0.5
Mercaptobenzothiazildisulfid 0,5Mercaptobenzothiazil disulfide 0.5
Nikkel-dibutyl-dithiocarbamat 1Nickel dibutyl dithiocarbamate 1
Denne blanding extruderes simultant med et isolerende materiale på basis af polyethylen indeholdende et tværbindingsmiddel på en metalsjæl til dannelse af henholdsvis et halvledende og et isolerende lag. Efter en varmebehandling som i de foregående eksempler kan de to lag let adskilles fra hinanden.This mixture is simultaneously extruded with a polyethylene-based insulating material containing a cross-linking agent on a metal shell to form a semiconducting and an insulating layer, respectively. After a heat treatment as in the previous examples, the two layers can be easily separated from each other.
EKSEMPEL 6EXAMPLE 6
Man fremstiller et halvledende lag som beskrevet i eksempel 3, hvortil man sætter 5 dele EPDM-kautsjuk. Man foretager en simultan-extrudering af denne blanding og af et materiale på basis af polyethylen indeholdende et tværbindingsmiddel på en metalsjæl til dannelse af henholdsvis et halvledende og et isolerende lag, samt en varmebehandling af disse. Man konstaterer, at de to opnåede lag er indbyrdes sammensvejsede, og at det praktisk talt er umuligt at adskille dem.A semiconductive layer is prepared as described in Example 3 to which 5 parts of EPDM rubber are added. Simultaneous extrusion of this mixture and of a polyethylene-based material containing a cross-linking agent onto a metal shell to form a semiconducting and an insulating layer, respectively, and a heat treatment thereof are carried out. It is found that the two obtained layers are mutually welded together and that it is practically impossible to separate them.
De særlige egenskaber ved de ved fremgangsmåden ifølge opfindelsen opnåede halvledende materialer muliggør, at man til en lav fremstillingspris og på en reduceret fremstillingstid kan opnå et elektrisk kabel med metalskærm til brug ved middelhøje spændinger, hvilket kabel let tilfredsstiller de krav, der opstår ved samlinger og forgreninger .The particular characteristics of the semiconducting materials obtained by the process according to the invention enable an electric cable with metal shield for use at medium voltages to be obtained at a low manufacturing cost and at a reduced manufacturing time, which easily satisfies the requirements arising from joints and branches.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7334298A FR2245058B1 (en) | 1973-09-25 | 1973-09-25 | |
| FR7334298 | 1973-09-25 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK500474A DK500474A (en) | 1975-06-02 |
| DK142186B true DK142186B (en) | 1980-09-15 |
| DK142186C DK142186C (en) | 1981-02-16 |
Family
ID=9125525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK500474AA DK142186B (en) | 1973-09-25 | 1974-09-24 | Process for producing an electric cable with easily separable semiconducting and insulating layers. |
Country Status (12)
| Country | Link |
|---|---|
| BE (1) | BE820270A (en) |
| CH (1) | CH596644A5 (en) |
| DE (1) | DE2445744C2 (en) |
| DK (1) | DK142186B (en) |
| ES (1) | ES430338A1 (en) |
| FR (1) | FR2245058B1 (en) |
| GB (1) | GB1474230A (en) |
| IE (1) | IE39857B1 (en) |
| IT (1) | IT1022190B (en) |
| LU (1) | LU70989A1 (en) |
| NL (1) | NL7412521A (en) |
| SE (1) | SE417558B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2513576A1 (en) * | 1975-03-27 | 1976-10-07 | Kabel & Lackdrahtfab Gmbh | HIGH VOLTAGE CABLE |
| CA1135441A (en) | 1979-11-09 | 1982-11-09 | Polysar Limited | Membrane |
| JPS5690845A (en) * | 1979-12-25 | 1981-07-23 | Dainichi Nippon Cables Ltd | Flame-retardant rubber composition |
| JPS5861501A (en) * | 1981-10-08 | 1983-04-12 | 日本ユニカー株式会社 | Semiconductive material combining adhesivity and peelability |
| MXPA04006740A (en) * | 2002-01-09 | 2004-10-04 | Thomas & Betts Int | Semiconductive coating and application process for shielded elastomeric electrical cable accessories. |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3229012A (en) * | 1962-05-28 | 1966-01-11 | Gen Cable Corp | Method and apparatus for extruding laminar wall |
| CH475636A (en) * | 1967-05-23 | 1969-07-15 | Pirelli | Electric cable for medium voltage and procedure for its manufacture |
| DE2051268B2 (en) * | 1970-06-13 | 1972-09-14 | Sumitomo Electric Industries Ltd., Osaka (Japan) | INSULATED CABLE |
-
1973
- 1973-09-25 FR FR7334298A patent/FR2245058B1/fr not_active Expired
-
1974
- 1974-09-20 CH CH1276374A patent/CH596644A5/xx not_active IP Right Cessation
- 1974-09-23 IT IT27559/74A patent/IT1022190B/en active
- 1974-09-23 IE IE1955/74A patent/IE39857B1/en unknown
- 1974-09-23 NL NL7412521A patent/NL7412521A/en not_active Application Discontinuation
- 1974-09-24 DK DK500474AA patent/DK142186B/en unknown
- 1974-09-24 LU LU70989A patent/LU70989A1/xx unknown
- 1974-09-24 BE BE148830A patent/BE820270A/en not_active IP Right Cessation
- 1974-09-24 ES ES430338A patent/ES430338A1/en not_active Expired
- 1974-09-24 SE SE7412014A patent/SE417558B/en unknown
- 1974-09-25 DE DE2445744A patent/DE2445744C2/en not_active Expired
- 1974-09-25 GB GB4177274A patent/GB1474230A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2245058A1 (en) | 1975-04-18 |
| DE2445744C2 (en) | 1983-08-25 |
| ES430338A1 (en) | 1976-09-16 |
| IT1022190B (en) | 1978-03-20 |
| IE39857B1 (en) | 1979-01-17 |
| CH596644A5 (en) | 1978-03-15 |
| GB1474230A (en) | 1977-05-18 |
| NL7412521A (en) | 1975-03-27 |
| SE7412014L (en) | 1975-03-26 |
| IE39857L (en) | 1975-03-25 |
| FR2245058B1 (en) | 1977-08-12 |
| DK142186C (en) | 1981-02-16 |
| SE417558B (en) | 1981-03-23 |
| DE2445744A1 (en) | 1975-04-03 |
| BE820270A (en) | 1975-01-16 |
| DK500474A (en) | 1975-06-02 |
| LU70989A1 (en) | 1975-03-06 |
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