EP0029234A1 - Câble à basse tension muni d'une gaine d'isolation - Google Patents

Câble à basse tension muni d'une gaine d'isolation Download PDF

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Publication number
EP0029234A1
EP0029234A1 EP80107059A EP80107059A EP0029234A1 EP 0029234 A1 EP0029234 A1 EP 0029234A1 EP 80107059 A EP80107059 A EP 80107059A EP 80107059 A EP80107059 A EP 80107059A EP 0029234 A1 EP0029234 A1 EP 0029234A1
Authority
EP
European Patent Office
Prior art keywords
parts
low voltage
insulating layer
weight
voltage cable
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP80107059A
Other languages
German (de)
English (en)
Other versions
EP0029234B1 (fr
Inventor
Germano Beretta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pirelli and C SpA
Original Assignee
Pirelli Cavi SpA
Cavi Pirelli SpA
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 Pirelli Cavi SpA, Cavi Pirelli SpA filed Critical Pirelli Cavi SpA
Priority to AT80107059T priority Critical patent/ATE5284T1/de
Publication of EP0029234A1 publication Critical patent/EP0029234A1/fr
Application granted granted Critical
Publication of EP0029234B1 publication Critical patent/EP0029234B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0208—Cables with several layers of insulating material
    • 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
    • H01B3/443—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 vinylhalogenides or other halogenoethylenic compounds

Definitions

  • the present invention concerns an improvement to low voltage cables which comprise a single conductor and which are insulated with a compound based on polyvinylchloride (PVC), said cables being well known as wiring cables for civil appliances.
  • PVC polyvinylchloride
  • the insulating layer of the wiring cables for civil appliances is always realized with compounds having a very high mineral filler content up to 30 parts by weight per 100 parts by weight of resin.
  • the high friction coefficient due to the roughness creates difficulties during drawing, and abrasions because of the contact with the inner surface of the conduits.
  • the content of polyvinylchloride is always high with respect to said mineral filler.
  • the polyvinylchloride is a thermoplastic material and in case of overheating it melts, exposing the conductor, with serious risk of short circuits.
  • the present invention aims to improve with the electrical characteristics being the same, any other properties of the wiring cables for civil appliances used up to now, eliminating the drawbacks, but retaining very low costs of the product.
  • the invention teaches a cable the insulating layer of which, even if it comprises a high mineral filler content, much higher than the presently used content, has such a structure as to offer good mechanical characteristics, a very low friction coefficient, and a high fire resistance. Furthermore said insulating layer can be easily stripped and therefore easily applied and permits a high reliability in case of overheating.
  • one object of the invention is a low voltage cable, having a conductor constituted by one or more wires stranded together and covered with an insulating layer realized with a compound based on polyvinylchloride, said compound containing also at least a mineral filler and a plasticizer, characterized by the fact that said mineral filler is contained in the compound in proportions from 40 to 500 parts by weight per 100 parts by weight of polyvinylchloride, said plasticizer being contained in the compound in proportions from 60 to 120 parts by weight per 100 parts by weight of polyvinylchloride, a skin is provided covering the surface of said insulating layer, said skin having a thickness from 5 to 30 % of the thickness of said insulating layer and being constituted by a compound based on polyvinylchloride and containing at least a plasticizer in the quantity of 10 to 40 parts by weight per 100 parts by weight of polyvinylchloride.
  • the low voltage cable 10 shown in figure 1 comprises a conductor 11 constituted by a single wire, but it is understood that said conductor 11 could also comprise a plurality of wires stranded together.
  • the conductor 11 is covered with an insulating layer 12 extruded thereon.
  • the insulating layer 12 is constituted by a compound based on polyvinylchloride (PVC), containing at least a.. plasticizing mineral filler.
  • PVC polyvinylchloride
  • the mineral filler in the compound is present in a proportion from 40 to 500 parts by weight per 100 parts by weight of polyvinylchloride (PVC).
  • the compound of the insulating layer further contains a plasticizer in a proportion from 60 to 120 parts by weight per 100 parts by weight of PVC.
  • the plasticizer is contained in a quantity of 100 parts by weight per 100 parts by weight of PVC.
  • the insulating layer 12 is covered on its surface with a skin 13 or thin layer which is constituted by a compound based on PVC and containing at least a plasticizer.
  • the plasticizer is Di-2-(ethyl-hexyl)-phthalate (D.O.P.).
  • the content of plasticizer contained in the skin 13 is 10 to 40 parts by weight per 100 parts by weight of FVC. Its preferred content is 30 parts by weight per 100 parts by weight of PVC.
  • the thickness of the skin 13 is small with respect to the thickness of the insulating layer.
  • the skin thickness might be comprised between 5 and 30 % of the insulating layer thickness and preferably is 15 % of the same.
  • the structure of the cable 10 inclusive of skin 13 has a resistance to tensile stresses sufficient for the handling of the cable since the mechanical stresses occuring for example during the winding on the drum are taken up prevalently by the skin 13.
  • the electrical characteristics of said cable are good.
  • the outer surface of the cable 10 is moreover very smooth and very bright, owing to the prevalent presence of PVC in the skin 13, so that the cable 10 has a very low friction coefficient at its outer surface in respect to that of cables in use up to now. Said smoothness and brightness permit the drawing of the cable in- . side the conduits with easy, gentle and continuous sliding.
  • Another advantage offered by the cable 10 is the ease of stripping of the conductor 11, so that the insulating layer can easily and completely be removed from the conductor during the connecting and sealing operations.
  • it is sufficient to cut circularly the skin 13 and the insulating layer 12 down to the conductor 11 to remove a hollow pin comprising the skin 13 and the un-- derlying insulating layer 12 to which the skin 13 adheres perfectly because it is constituted by a compound having the same base of PVC.
  • the hollow pin cavity corresponds to the space previously occupied by the conductor 11.
  • any melting of the PVC will never expose the conductor 11, owing to the presence of a high mineral filler content which filler remains compact, preventing the melted PVC from draining and on the contrary keeping the latter in place.
  • a cable 10 according to the invention comprising an insulation with a high content of mineral filler has always a sufficiently high plasticizer-resin ratio, contributes to give the cable 10 itself a good cold flexibility.
  • a further property of cable 10 is a good behaviour to thermocompression because of the essentially "mineral" structure of the compound.
  • Said structure shown by a compound with high mineral filler content, improves also the thermal conductivity of the cable 10 with respect to conventional compounds. It follows a more rapid cooling of the cable.
  • the compound according to the invention does not include any colouring pigments, especially in the insulating layer, with a minimum risk, therefore, of decay of the insulating characteristics.
  • the presence of a high mineral filler content makes the cable 10 particularly resistant to flames since said high quantity of filler, besides being incombustible, improves the compatibility of PVC resin with chloroparaffins.
  • a cable 10 has a further advantage resulting from the good impermeability of skin 13, which lowers greatly the absorption of water of the assembly.
  • the advantage is considerable if it is considered that to draw a bundle of cables, with dimensions equal to those of the bundle on which the experimental tests have been conducted, but realized with two cables of conventional type, it is necessary to apply a drawing force of 9 kg.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Insulated Conductors (AREA)
  • Organic Insulating Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Cable Accessories (AREA)
  • Communication Cables (AREA)
EP80107059A 1979-11-15 1980-11-14 Câble à basse tension muni d'une gaine d'isolation Expired EP0029234B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80107059T ATE5284T1 (de) 1979-11-15 1980-11-14 Niederspannungskabel mit isolierschicht.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT27295/79A IT1165372B (it) 1979-11-15 1979-11-15 Cavo per basse tensione con isolante perfezionato
IT2729579 1979-11-15

Publications (2)

Publication Number Publication Date
EP0029234A1 true EP0029234A1 (fr) 1981-05-27
EP0029234B1 EP0029234B1 (fr) 1983-11-09

Family

ID=11221372

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80107059A Expired EP0029234B1 (fr) 1979-11-15 1980-11-14 Câble à basse tension muni d'une gaine d'isolation

Country Status (13)

Country Link
EP (1) EP0029234B1 (fr)
JP (1) JPS5684811A (fr)
AR (1) AR221445A1 (fr)
AT (1) ATE5284T1 (fr)
AU (1) AU541268B2 (fr)
BR (1) BR8007440A (fr)
CA (1) CA1163688A (fr)
DE (1) DE3065555D1 (fr)
ES (1) ES497224A0 (fr)
IT (1) IT1165372B (fr)
MX (1) MX152432A (fr)
NO (1) NO155266C (fr)
NZ (1) NZ195523A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0120382A1 (fr) * 1983-03-25 1984-10-03 SOCIETA' CAVI PIRELLI S.p.A. Câble à basse tension
GB2161644A (en) * 1984-07-09 1986-01-15 Pirelli General Plc Flexible electric cable
US20110203830A1 (en) * 2008-10-31 2011-08-25 Daikin America, Inc. Foam electric wire
US8330045B2 (en) 2005-12-26 2012-12-11 Industrial Technology Research Institute Fire-resistant wire/cable

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2051192B2 (de) * 1969-10-21 1978-08-03 Industrie Pirelli S.P.A., Mailand (Italien) Flammfestes elektrisches Kabel
US4166881A (en) * 1977-12-27 1979-09-04 Western Electric Company Top coated PVC articles
DE2114369B2 (de) * 1971-03-25 1979-09-06 Kabel- Und Metallwerke Gutehoffnungshuette Ag, 3000 Hannover Mischungen auf der Basis elektrisch isolierender Werkstoffe

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5350484A (en) * 1976-10-19 1978-05-08 Hitachi Cable Ltd Highly flame resistant cable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2051192B2 (de) * 1969-10-21 1978-08-03 Industrie Pirelli S.P.A., Mailand (Italien) Flammfestes elektrisches Kabel
DE2114369B2 (de) * 1971-03-25 1979-09-06 Kabel- Und Metallwerke Gutehoffnungshuette Ag, 3000 Hannover Mischungen auf der Basis elektrisch isolierender Werkstoffe
US4166881A (en) * 1977-12-27 1979-09-04 Western Electric Company Top coated PVC articles

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
HELMUT GRAMM, WERNER SOMMER " Lösungsmittel und Weichmachungsmittel ", 7th edition, 1958. WISSENSCHAFTLICHE VERLAGSGESELLSCHAFTmbH, Stuttgart, page 653. * Page 653, line 11 to end of page * *
PATENT ABSTRACTS OF JAPAN, unexamined applications, E-Section, Vol. 2, No. 86, July 14, 1978. THE PATENT OFFICE JAPANESE GOVERNMENT, page 3750 E 78 & JP-A-53 050484 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0120382A1 (fr) * 1983-03-25 1984-10-03 SOCIETA' CAVI PIRELLI S.p.A. Câble à basse tension
GB2161644A (en) * 1984-07-09 1986-01-15 Pirelli General Plc Flexible electric cable
US8330045B2 (en) 2005-12-26 2012-12-11 Industrial Technology Research Institute Fire-resistant wire/cable
US20110203830A1 (en) * 2008-10-31 2011-08-25 Daikin America, Inc. Foam electric wire

Also Published As

Publication number Publication date
EP0029234B1 (fr) 1983-11-09
AU541268B2 (en) 1985-01-03
AR221445A1 (es) 1981-01-30
IT7927295A0 (it) 1979-11-15
NO803428L (no) 1981-05-18
NO155266C (no) 1987-03-04
MX152432A (es) 1985-07-15
IT1165372B (it) 1987-04-22
ES8106629A1 (es) 1981-08-01
JPH0230126B2 (fr) 1990-07-04
NZ195523A (en) 1982-12-07
ES497224A0 (es) 1981-08-01
BR8007440A (pt) 1981-05-26
AU6403580A (en) 1981-05-21
JPS5684811A (en) 1981-07-10
ATE5284T1 (de) 1983-11-15
CA1163688A (fr) 1984-03-13
DE3065555D1 (en) 1983-12-15
NO155266B (no) 1986-11-24

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