GB2161644A - Flexible electric cable - Google Patents
Flexible electric cable Download PDFInfo
- Publication number
- GB2161644A GB2161644A GB08417496A GB8417496A GB2161644A GB 2161644 A GB2161644 A GB 2161644A GB 08417496 A GB08417496 A GB 08417496A GB 8417496 A GB8417496 A GB 8417496A GB 2161644 A GB2161644 A GB 2161644A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bedding layer
- parts
- cross
- cable
- pvc
- 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
Links
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 29
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 27
- 239000000203 mixture Substances 0.000 claims abstract description 20
- 239000004020 conductor Substances 0.000 claims abstract description 19
- 238000009413 insulation Methods 0.000 claims abstract description 16
- 239000011256 inorganic filler Substances 0.000 claims abstract description 10
- 229910003475 inorganic filler Inorganic materials 0.000 claims abstract description 10
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 9
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 claims abstract description 7
- 239000004014 plasticizer Substances 0.000 claims abstract description 7
- 229920002943 EPDM rubber Polymers 0.000 claims abstract description 6
- 239000000945 filler Substances 0.000 claims abstract description 5
- 241000276489 Merlangius merlangus Species 0.000 claims abstract description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract 2
- 239000000463 material Substances 0.000 claims description 8
- 239000000314 lubricant Substances 0.000 claims description 6
- 239000003381 stabilizer Substances 0.000 claims description 6
- 229920001577 copolymer Polymers 0.000 claims description 5
- 238000005299 abrasion Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 235000000396 iron Nutrition 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 3
- 231100000489 sensitizer Toxicity 0.000 claims description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 2
- 239000003082 abrasive agent Substances 0.000 claims description 2
- 229910052787 antimony Inorganic materials 0.000 claims description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000003086 colorant Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims description 2
- 238000004132 cross linking Methods 0.000 claims description 2
- 239000003431 cross linking reagent Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims description 2
- 239000003063 flame retardant Substances 0.000 claims description 2
- 238000009472 formulation Methods 0.000 claims description 2
- 239000012774 insulation material Substances 0.000 claims description 2
- 238000005476 soldering Methods 0.000 claims description 2
- 239000004753 textile Substances 0.000 claims description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 claims 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
-
- 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
-
- 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
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
- H01B7/041—Flexible cables, conductors, or cords, e.g. trailing cables attached to mobile objects, e.g. portable tools, elevators, mining equipment, hoisting cables
-
- 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
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
Abstract
A low voltage cable comprises a plurality of insulated conductors 11, 12 which are contained within an insulating bedding layer 13 of circular cross-section, the bedding layer comprising a thermoplastic polymer and at least 50% by weight of one or more inorganic fillers, and an outer sheath 14 of a cross-linked polyvinyl chloride-based insulation composition. The thermoplastic polymer may be PVC, EVA, EPR or EPDM and the filler whiting or chalk. Phthalate plasticiser may be added to the thermoplastic. The use of a bedding layer of circular cross-section eliminates the customary internal longitudinal ribs of PVC of the outer sheath of the prior art. The ribs reduced the flexibility of the cable. <IMAGE>
Description
SPECIFICATION
Flexible electric cables
This invention is concerned with flexible electric cables which are primarily intended for use as the power leads of domestic and industrial tools and appliances which are likely to be subjected to heat hazards and/or mechanical abuse in use.
The power leads of such appliances as domestic irons, soldering irons and other heated appliances, and powertoois, such as drills, are liable to be subjected to heat hazards from accidental contact with hot objects and/or mechanical abuse by repeated rubbing against hard surfaces, by contact with abrasive materials or sharp edges, and the like. Some such tools and appliances are conventionally provided with flexible leads which are covered with braided textiles or vulcanised rubber or polyvinyl chloride (PVC)based sheaths, but each of these materials is subject to one or more ofthefollowing disadvantages; it is insufficiently resistant to thermal and/or mechnical abuse, it is relatively expensive, itcannot be produced in a wide range of colours, or it is not suitable for the formation of moulded terminations.
More recently flexible leadsforthis purpose have been made by surrounding the insulated conductors (usually three) with PVC-based insulation which is cross-linked, normally by irradiation with ionising radiation. Cross-linked PVC insulation compositions have good heat, abrasion and wear resistance.
However the non-circular cross-section provided by three twisted insulated conductors means that the cross-linked PVC coating is of non-uniform thickness in section and is provided, in effect, with internal longitudinally extending ribs. This variation in the thickness of the PVC coating substantially increases the stiffness ofthe cable and the lattertendsto have insufficientflexibilityforthe intended uses.
We have now developed a cable construction which provides a combination of properties which are desirableforthe purpose indicated, that is good heat, wear and abrasion resistance and good flexibility. The cable comprises a plurality of insulated conductors which are contained within an insulating bedding layer of circular cross-section, the bedding layer comprising a thermoplastic polymner and at least 50% by weight of one or more inorganic fillers, and an outer sheath of a cross-linked PVC-based insulation composition.
In orderthatthe invention may be more fully understood, a preferred embodiment of cable will now be described, by way of example, with reference to the single Figure of the accompanying drawing, which is a cross-section of the embodiment.
Referring to the drawing, the cable 10 comprises three conductors 11, each provided with its own insulation 12 (the core insulation). The insulated conductors 11/12 are embedded in an insulating bedding layer 13 which has a circular cross-section.
The bedding layer 13 is, in turn, contained within an outer sheath 14 of a cross-linked PVC-based sheathing composition.
The elements of the cable, and preferred features thereof, will now be described in greater detail.
The conductors and the core insulation thereof may be entirely conventional and as are generally used in power supply cables for tools and appliances ofthe kinds referred to above. Suitable conductors and core insulation forthis purpose will be well known to those skilled in the art and these elements of the cable will not be further described.
The bedding layer comprises, as already stated, a thermoplastic polymer and at least 50% by weight of one or more inorganic fillers. Generally, it is preferred to use PVC as the bedding layer polymer, but other suitable polymers are, for example, ethyiene-vinyl acetate copolymer (EVA), ethylene-propylene copolymer (EPR), and ethylene-propylene-diene monomer copolymer (EPDM). The bedding layer is preferably highly filled, that is it is preferred that it should contain 60 to 80% by weight of filler.Any of the inorganic fillers which are conventionally used in insulating compositions can, in principle, be used in the bedding layer. Itis preferred,foreconomic reasons,to use cheap and readily available fillers, such as chalk or whiting.The principal function of the bedding layer is to provide circularity, but it also has the subsidiary function of providing a layer of lowthermal conductivity between the outer sheath and the insulated conductors and the components ofthe bedding layer are preferabiy chosen with this end in view.
A preferred bedding layer composition is, for example, as follow (all parts by weight):
PVC 100 parts
phthalate plasticiser 125 parts
chalk 600 parts
stabiliser 2 parts
lubricant 10 parts
The outer sheath of cross-linked PVC-based insulation material may be of conventional composition, such sheath materials having been used for cables, as previously mentioned; as compared with the jackets of this type of material previously used, the sheath of the present invention is of substantially uniform thickness around the cable so that the latter has good flexibility.
The detailed formulation of such sheath materials including suitable cross-linking agents therefore and suitable radiation dosages to obtain the desired level of cross-linking, will be known to those skilled in the art.
A preferred sheath composition is, for example, as follows (all parts by weight):
PVC 100 parts
phthalate plasticiser 60 parts
clay 20 parts
antimony based flame retardant 3 parts
stabiliser 7 parts
lubricant 1 part
sensitiser 8 parts
CLAIMS
1. A low voltage cable which comprises a plurality of insulated conductors which are contained within an The claims were filed later than the filing date within the period prescribed by Rule 25(1) > of the Patents Rules 1982.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (7)
1. A low voltage cable which comprises a plurality of insulated conductors which are contained within an The claims were filed later than the filing date within the period prescribed by Rule 25(1) > of the Patents Rules 1982.
insulating bedding layer of circular cross-section, the bedding layer comprising a thermoplastic polymer and at least 50% by weight of one or more inorganic fillers, and an outer sheath of a cross-linked polyvinyl chloride-based insulation composition.
2. A cable according to claim 1, in which the thermoplastic polymer of the bedding layer is polyvinyl chloride, ethylene-vinyl acetate copolymer, ethylene-propylene copolymer, or ethylene-propylene-diene monomer copolymer.
3. Acable according to claim 1 or2, in which the bedding layer comprises 60 to 80% by weight of one or more inorganicfillers.
4. Acable according to any of claims 1 to 3, in which the inorganic filler is chalk orwhiting.
5. A cable according to any of claims 1 to 4, in which the composition ofthe bedding layer comprises:
Parts by weight
polyvinyl chloride 100
phthalate plasticiser 125
chalk 600
stabiliser 2
lubricant 10
6. A cable according to any of claims 1 to5,in which the composition of the outer sheath comprises:
Parts by weight
polyvinyl chloride 100
phthalate plasticiser 60
clay 20
antimony-basedflame retardant 3
stabiliser 7
lubricant 1
sensitiser 8
7. A lowvoltage cablesubstantially asherein described with reference to the accompanying drawing.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08417496A GB2161644B (en) | 1984-07-09 | 1984-07-09 | Flexible electric cable |
| IT21423/85A IT1185182B (en) | 1984-07-09 | 1985-07-03 | FLEXIBLE ELECTRIC CABLES |
| BR8503250A BR8503250A (en) | 1984-07-09 | 1985-07-08 | FLEXIBLE ELECTRIC CABLES |
| CA000486459A CA1250914A (en) | 1984-07-09 | 1985-07-08 | Flexible electric cables |
| MX205927A MX158536A (en) | 1984-07-09 | 1985-07-09 | IMPROVEMENTS IN LOW VOLTAGE FLEXIBLE ELECTRICAL CABLES |
| AU44725/85A AU4472585A (en) | 1984-07-09 | 1985-07-09 | Flexible electric cables |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08417496A GB2161644B (en) | 1984-07-09 | 1984-07-09 | Flexible electric cable |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8417496D0 GB8417496D0 (en) | 1984-08-15 |
| GB2161644A true GB2161644A (en) | 1986-01-15 |
| GB2161644B GB2161644B (en) | 1987-11-11 |
Family
ID=10563639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08417496A Expired GB2161644B (en) | 1984-07-09 | 1984-07-09 | Flexible electric cable |
Country Status (6)
| Country | Link |
|---|---|
| AU (1) | AU4472585A (en) |
| BR (1) | BR8503250A (en) |
| CA (1) | CA1250914A (en) |
| GB (1) | GB2161644B (en) |
| IT (1) | IT1185182B (en) |
| MX (1) | MX158536A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2209091A (en) * | 1987-08-26 | 1989-04-26 | Pirelli Brasil | Extra-high-tension power cable |
| US7586044B2 (en) * | 2004-06-07 | 2009-09-08 | Nexans | Cable including a plurality of insulated conductors enclosed in the same sheath and method of fabricating this kind of cable |
| CN104575729A (en) * | 2014-12-30 | 2015-04-29 | 安徽顺驰电缆有限公司 | Cable |
| CN111524652A (en) * | 2020-04-27 | 2020-08-11 | 安徽华能电缆集团有限公司 | Ethylene propylene rubber insulation rat-proof ant-proof low-smoke halogen-free flame-retardant power cable for ships |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104900308B (en) * | 2014-03-04 | 2017-09-29 | 上海福尔欣线缆有限公司 | A kind of car belt cable and its manufacture method |
| CN107221376A (en) * | 2017-06-23 | 2017-09-29 | 安徽华通电缆集团有限公司 | A kind of environment-friendly type railway station building low-voltage-powered cable of fire resisting |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1255243A (en) * | 1968-09-09 | 1971-12-01 | Pirelli | Improvements in or relating to flame resistant-plastics-insulated electric cables |
| GB1480090A (en) * | 1974-12-05 | 1977-07-20 | Pirelli General Cable Works | Electric cable |
| GB2009488A (en) * | 1977-12-02 | 1979-06-13 | Bicc Ltd | Electric cables |
| GB1583957A (en) * | 1977-03-10 | 1981-02-04 | Bicc Ltd | Electric cables |
| GB1583956A (en) * | 1977-03-10 | 1981-02-04 | Bicc Ltd | Electric cables |
| GB1583955A (en) * | 1977-01-17 | 1981-02-04 | Bicc Ltd | Electric cables |
| GB2059140A (en) * | 1979-09-18 | 1981-04-15 | Pirelli General Cable Works | Flame retardant electric cables |
| EP0029234A1 (en) * | 1979-11-15 | 1981-05-27 | SOCIETA CAVI PIRELLI S.p.A. | Low voltage cable provided with improved insulating layer |
-
1984
- 1984-07-09 GB GB08417496A patent/GB2161644B/en not_active Expired
-
1985
- 1985-07-03 IT IT21423/85A patent/IT1185182B/en active
- 1985-07-08 CA CA000486459A patent/CA1250914A/en not_active Expired
- 1985-07-08 BR BR8503250A patent/BR8503250A/en not_active IP Right Cessation
- 1985-07-09 MX MX205927A patent/MX158536A/en unknown
- 1985-07-09 AU AU44725/85A patent/AU4472585A/en not_active Abandoned
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1255243A (en) * | 1968-09-09 | 1971-12-01 | Pirelli | Improvements in or relating to flame resistant-plastics-insulated electric cables |
| GB1480090A (en) * | 1974-12-05 | 1977-07-20 | Pirelli General Cable Works | Electric cable |
| GB1583955A (en) * | 1977-01-17 | 1981-02-04 | Bicc Ltd | Electric cables |
| GB1583957A (en) * | 1977-03-10 | 1981-02-04 | Bicc Ltd | Electric cables |
| GB1583956A (en) * | 1977-03-10 | 1981-02-04 | Bicc Ltd | Electric cables |
| GB2009488A (en) * | 1977-12-02 | 1979-06-13 | Bicc Ltd | Electric cables |
| GB2059140A (en) * | 1979-09-18 | 1981-04-15 | Pirelli General Cable Works | Flame retardant electric cables |
| EP0029234A1 (en) * | 1979-11-15 | 1981-05-27 | SOCIETA CAVI PIRELLI S.p.A. | Low voltage cable provided with improved insulating layer |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2209091A (en) * | 1987-08-26 | 1989-04-26 | Pirelli Brasil | Extra-high-tension power cable |
| GB2209091B (en) * | 1987-08-26 | 1991-07-17 | Pirelli Brasil | "extra-high-tension power cable" |
| US7586044B2 (en) * | 2004-06-07 | 2009-09-08 | Nexans | Cable including a plurality of insulated conductors enclosed in the same sheath and method of fabricating this kind of cable |
| CN104575729A (en) * | 2014-12-30 | 2015-04-29 | 安徽顺驰电缆有限公司 | Cable |
| CN111524652A (en) * | 2020-04-27 | 2020-08-11 | 安徽华能电缆集团有限公司 | Ethylene propylene rubber insulation rat-proof ant-proof low-smoke halogen-free flame-retardant power cable for ships |
| CN111524652B (en) * | 2020-04-27 | 2021-09-07 | 安徽华能电缆集团有限公司 | Ethylene propylene rubber insulation rat-proof ant-proof low-smoke halogen-free flame-retardant power cable for ships |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2161644B (en) | 1987-11-11 |
| CA1250914A (en) | 1989-03-07 |
| GB8417496D0 (en) | 1984-08-15 |
| IT1185182B (en) | 1987-11-04 |
| IT8521423A0 (en) | 1985-07-03 |
| BR8503250A (en) | 1986-03-25 |
| MX158536A (en) | 1989-02-09 |
| AU4472585A (en) | 1986-01-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960709 |