WO1981000169A1 - Cable electrique a isolant cellulaire, et procede de preparation de celui-ci - Google Patents

Cable electrique a isolant cellulaire, et procede de preparation de celui-ci Download PDF

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Publication number
WO1981000169A1
WO1981000169A1 PCT/FR1980/000111 FR8000111W WO8100169A1 WO 1981000169 A1 WO1981000169 A1 WO 1981000169A1 FR 8000111 W FR8000111 W FR 8000111W WO 8100169 A1 WO8100169 A1 WO 8100169A1
Authority
WO
WIPO (PCT)
Prior art keywords
cable according
agent
polyvinyl chloride
electric cable
fine grains
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.)
Ceased
Application number
PCT/FR1980/000111
Other languages
English (en)
French (fr)
Inventor
H Sandjivy
B Ormili
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.)
Cables de Lyon SA
Original Assignee
Cables de Lyon SA
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 Cables de Lyon SA filed Critical Cables de Lyon SA
Publication of WO1981000169A1 publication Critical patent/WO1981000169A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
    • H01B7/285—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable
    • H01B7/2855—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable using foamed plastic
    • 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
    • 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
    • H01B7/0233—Cables with a predominant gas dielectric

Definitions

  • the present invention relates to an electrical cable for low or medium voltage, with cellular insulation forming at the same time a sheath.
  • Polyethylene cellular insulating electrical cables are already known. This, however, is a relatively high density material and quite expensive. Solid insulation cables made of compact polyvinyl chloride, a less dense and less expensive material than polyethylene, have already been used. But until now we had not succeeded in obtaining cellular polyvinyl chloride insulators, because it must be added with plasticizers and fillers to allow its use in cables, and the tests carried out so far on coating of conductors by cellular polyvinyl chloride gave only cables of very irregular thickness, unsatisfactory for industrial use.
  • the present invention aims to provide an electrical cable with cellular insulation, forming at the same time, sealing sheath, of polyvinyl chloride, which has a uniform thickness, an expansion of the insulation which is not excessive, a fine structure and a fairly smooth surface appearance, allowing its application in industrial manufacturing.
  • the electric cable according to the invention is characterized in that its insulator consists of expanded polyvinyl chloride up to a percentage of closed pores of about 20 to 40%, by the addition of very fine grains of an agent chemical expansion of decomposition point between 180 ° and 200 ° C approximately.
  • the chemical blowing agent is azodicarbonamide.
  • the chemical blowing agent is in grains of average size about 10 microns.
  • the chemical blowing agent is in proportion by weight from 0.05 to 0.5% by weight.
  • Polyvinyl chloride is also added with a nucleating agent.
  • the nucleating agent is talc in fine grains.
  • - Talc in fine grains is in proportion of about 0.5% by weight.
  • the invention also relates to a method of manufacturing an electric cable as defined above, characterized in that it is passed through an extruder whose head temperature is maintained between 160 ° and 180 ° C, on the one hand by the punch an electrical conductor, on the other hand by the peripheral matrix of polyvinyl chloride added with very fine grains of a chemical expanding agent with a decomposition point of about 180 ° to 200 ° C.
  • the polyvinylchloride application head was for the delivery screw of the plastic material of a conventional type, used in particular for polyethylene, with a filter formed by a 30/60/120/60 screen, a punch of 0.92 mm diameter and a 2.2 mm diameter die.
  • the speed of the discharge screw was 68 revolutions / minute, and the pulling speed of 50 m / min.
  • the copper wire was preheated.
  • the invention applies in particular to the insulation of cables and electrical conductors for low voltage.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Organic Insulating Materials (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Molding Of Porous Articles (AREA)
  • Insulated Conductors (AREA)
  • Processes Specially Adapted For Manufacturing Cables (AREA)
PCT/FR1980/000111 1979-07-09 1980-07-04 Cable electrique a isolant cellulaire, et procede de preparation de celui-ci Ceased WO1981000169A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7917741A FR2461340A1 (fr) 1979-07-09 1979-07-09 Cable electrique a isolant cellulaire, et procede de preparation de celui-ci
FR7917741 1979-07-09

Publications (1)

Publication Number Publication Date
WO1981000169A1 true WO1981000169A1 (fr) 1981-01-22

Family

ID=9227667

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR1980/000111 Ceased WO1981000169A1 (fr) 1979-07-09 1980-07-04 Cable electrique a isolant cellulaire, et procede de preparation de celui-ci

Country Status (5)

Country Link
EP (1) EP0022415B1 (cs)
JP (1) JPS56500789A (cs)
DE (1) DE3065880D1 (cs)
FR (1) FR2461340A1 (cs)
WO (1) WO1981000169A1 (cs)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2609835B1 (fr) * 1987-01-20 1992-03-13 Nordlys Materiau d'etancheite et son application a l'industrie du cable

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1036966B (de) * 1956-12-15 1958-08-21 Felten & Guilleaume Carlswerk Elektrisches Kabel mit wasserdichtem gewelltem Metallmantel
BE666019A (cs) * 1964-07-17 1965-10-18
DE2056520A1 (de) * 1969-11-19 1971-05-27 British Insulated Callenders Fernmeldekabel
DE2853626A1 (de) * 1977-12-16 1979-06-28 Sumitomo Electric Industries Mit einem geschaeumten kunststoff isolierter draht und verfahren zu seiner herstellung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT246703B (de) * 1964-02-22 1966-05-10 Dynamit Nobel Ag Verfahren zur Herstellung von alkalihydroxydhaltigen Massen mit hohem Alkali- oder Erdalkalihydridgehalt
BE790023A (fr) * 1971-10-14 1973-04-13 Int Standard Electric Corp Perfectionnements a la fabrication des cables telephoniques multiconducteurs
JPS4924577A (cs) * 1972-06-29 1974-03-05
JPS4995193A (cs) * 1973-01-17 1974-09-10
JPS5321428B2 (cs) * 1973-08-17 1978-07-03

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1036966B (de) * 1956-12-15 1958-08-21 Felten & Guilleaume Carlswerk Elektrisches Kabel mit wasserdichtem gewelltem Metallmantel
BE666019A (cs) * 1964-07-17 1965-10-18
DE2056520A1 (de) * 1969-11-19 1971-05-27 British Insulated Callenders Fernmeldekabel
DE2853626A1 (de) * 1977-12-16 1979-06-28 Sumitomo Electric Industries Mit einem geschaeumten kunststoff isolierter draht und verfahren zu seiner herstellung

Also Published As

Publication number Publication date
DE3065880D1 (en) 1984-01-19
JPS56500789A (cs) 1981-06-11
EP0022415A1 (fr) 1981-01-14
FR2461340A1 (fr) 1981-01-30
FR2461340B1 (cs) 1982-09-03
EP0022415B1 (fr) 1983-12-14

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