CA1250914A - Flexible electric cables - Google Patents
Flexible electric cablesInfo
- Publication number
- CA1250914A CA1250914A CA000486459A CA486459A CA1250914A CA 1250914 A CA1250914 A CA 1250914A CA 000486459 A CA000486459 A CA 000486459A CA 486459 A CA486459 A CA 486459A CA 1250914 A CA1250914 A CA 1250914A
- Authority
- CA
- Canada
- Prior art keywords
- cable
- bedding layer
- set forth
- ethylene
- cross
- 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.)
- Expired
Links
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 11
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000004020 conductor Substances 0.000 claims abstract description 9
- 238000009413 insulation Methods 0.000 claims abstract description 9
- 239000011256 inorganic filler Substances 0.000 claims abstract description 6
- 229910003475 inorganic filler Inorganic materials 0.000 claims abstract description 6
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 4
- 229920001577 copolymer Polymers 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 229920002943 EPDM rubber Polymers 0.000 claims description 2
- 241000276489 Merlangius merlangus Species 0.000 claims description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 claims 1
- 239000004416 thermosoftening plastic Substances 0.000 claims 1
- 239000000945 filler Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 235000000396 iron Nutrition 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 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 description 1
- 241000517645 Abra Species 0.000 description 1
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 1
- AYFVYJQAPQTCCC-GBXIJSLDSA-N L-threonine Chemical compound C[C@@H](O)[C@H](N)C(O)=O AYFVYJQAPQTCCC-GBXIJSLDSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 231100000489 sensitizer Toxicity 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 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
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A low voltage 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 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.
A low voltage 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 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.
Description
~2509~L4 FLEXIBLE ELECTRIC CABLES
BACKGROIJND OF THE INVENTION
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 power tools, 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 materiaIs is subject to one or more of the following disadvantages; it is insufficiently resistant to thermal and~or mechanical abuse, it is relatively expensive, it cannot be produced in a wide range of colours, or it is not suitable for the formation of moulded terminations.
More re~cently flexible leads for this purpose have been mad~e by surrounding the insulated conductors (usually thre~) with PVC-based insulation which is cross-linked~ normally by irradiation with ionising radiation. Cross-linked PVC insulation compositions have good heat, abra.sion and wcar resistance. However the non-c;ircular cro~ss-section provided by thrce twisted insulated conductors means that the cross-linked 3 PVC coating is of non-uni~orm thickness in section and 12S09~l4 is provided, in effect, with internal longitudinally extending ribs. This variation in the thickness of the PVC coating substan-tially increases the stiffness of the cable and the latter tends to have insufficient flexibility for the intended uses.
SUMMARY OF THE INVENTION
An object of the invention is to provide a cable con-struction which provides a combination of properties which are desirable for the purpose indicated, that is good heat, wear and abrasion resistance and good flexibility.
In accordance with the present invention, there is pro-vided a low voltage electric cable which comprises a plurality of insulated conductors which are contained within an insulating bed-ding 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, the sheath being of substantially uniform cross-sectional thickness and being free of longitudinally extending ribs.
DESCRIPTION OF THE INVENTION
In order that the 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 insula-ted conductors 11/12 are embedded in an insulating bedding layer 13 which has a circular cross-section.
1250g~4 -3a- 20373-1220 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.
lZ50914 The conductors and the core insulation thereof may be entirely conventional and as are generally used in power supply cables for tools and appliances of the kind.s referred to abo~e. Suitable conduct.ors and core j insulation for this purpose h~ill be well knoh~n to those skilled in the art and these element,s of the cable will not be furt.her described.
The beddinc layeT comprises, as already .stated~
a thermoplast.ic polymer and at. least 50~0 by wei~ht of one or more inorcanic filler~s. Generall,v, it is preferred to use P~'C as the bedding layer polymer, but, other suitable pol mers are, for example~ ethylene-vinyl acetat.e copol~mer tE~'A.~ et,hylene-propylene copolymer ~EPR), and ethylene-propylene-diene monomer Ij copolymer (~P~). The beddin~ layer is preferably highly filled, that is it is preferred that it should contain 60 to 80~ by wei~ht of filler. Any of the inorganic fillers which are conventionally used in insulating compositions can~ in principle~ be used in
BACKGROIJND OF THE INVENTION
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 power tools, 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 materiaIs is subject to one or more of the following disadvantages; it is insufficiently resistant to thermal and~or mechanical abuse, it is relatively expensive, it cannot be produced in a wide range of colours, or it is not suitable for the formation of moulded terminations.
More re~cently flexible leads for this purpose have been mad~e by surrounding the insulated conductors (usually thre~) with PVC-based insulation which is cross-linked~ normally by irradiation with ionising radiation. Cross-linked PVC insulation compositions have good heat, abra.sion and wcar resistance. However the non-c;ircular cro~ss-section provided by thrce twisted insulated conductors means that the cross-linked 3 PVC coating is of non-uni~orm thickness in section and 12S09~l4 is provided, in effect, with internal longitudinally extending ribs. This variation in the thickness of the PVC coating substan-tially increases the stiffness of the cable and the latter tends to have insufficient flexibility for the intended uses.
SUMMARY OF THE INVENTION
An object of the invention is to provide a cable con-struction which provides a combination of properties which are desirable for the purpose indicated, that is good heat, wear and abrasion resistance and good flexibility.
In accordance with the present invention, there is pro-vided a low voltage electric cable which comprises a plurality of insulated conductors which are contained within an insulating bed-ding 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, the sheath being of substantially uniform cross-sectional thickness and being free of longitudinally extending ribs.
DESCRIPTION OF THE INVENTION
In order that the 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 insula-ted conductors 11/12 are embedded in an insulating bedding layer 13 which has a circular cross-section.
1250g~4 -3a- 20373-1220 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.
lZ50914 The conductors and the core insulation thereof may be entirely conventional and as are generally used in power supply cables for tools and appliances of the kind.s referred to abo~e. Suitable conduct.ors and core j insulation for this purpose h~ill be well knoh~n to those skilled in the art and these element,s of the cable will not be furt.her described.
The beddinc layeT comprises, as already .stated~
a thermoplast.ic polymer and at. least 50~0 by wei~ht of one or more inorcanic filler~s. Generall,v, it is preferred to use P~'C as the bedding layer polymer, but, other suitable pol mers are, for example~ ethylene-vinyl acetat.e copol~mer tE~'A.~ et,hylene-propylene copolymer ~EPR), and ethylene-propylene-diene monomer Ij copolymer (~P~). The beddin~ layer is preferably highly filled, that is it is preferred that it should contain 60 to 80~ by wei~ht of filler. Any of the inorganic fillers which are conventionally used in insulating compositions can~ in principle~ be used in
2~ the bedding layer~ It is preferred~ for economic reasons, to use cheap and readil~ a~ailable fillers~
such as chal~ or whiting. The principal function of the beddin~ layer is to pro~ide circularit~-~ but it also ha~s the subsidiar~ funct,ion of providin~ a layer of low t,hermal conductivity betheen the outer sheath and t.he insulat,ed conductor.s and the components of the beddinc layer are preferabl~ chosen wit.h this end n vlew.
A preferred beddinc~ layer composit.ion i.s, for example! as follow.s (all pa-t~s by hei~ht):
PV~ 100 part.s pht.halat.e plasticisel- 125 part.s ~ par~t~i stabiliser 2 parts l~lL)r-icclllt]~ part,s ~he o~ter cheath c~f' cro~-lin~ed ~\'0-ba,~ed insulation material may be of convent.ional composition, such sheath materials ha~ing been used for cables, as previously ment.ioned; as compared with the jackets of this type of material pre~iously used, the sheath of the present in-ention is of sub.st,antially uniform thick-ness around the cable so that, the latter has ~ood flexibility.
The det,ailed formulat,ion of such sheath materials including suitable cross-linking agents therefor-e and suitable radiation dosages to obt.ain the de.sired le~el of cross-linking~ will be known to t,hose skilled in the art.
A preferred sheath composition is, for example, as follows (all parts by weight):
P~'C 100 parts phthalate plasticiser 60 parts clay 20 parts antimony based flame retardant. ~ parts st.abiliser 7 parts lubricant 1 part sensitiser ~ parts
such as chal~ or whiting. The principal function of the beddin~ layer is to pro~ide circularit~-~ but it also ha~s the subsidiar~ funct,ion of providin~ a layer of low t,hermal conductivity betheen the outer sheath and t.he insulat,ed conductor.s and the components of the beddinc layer are preferabl~ chosen wit.h this end n vlew.
A preferred beddinc~ layer composit.ion i.s, for example! as follow.s (all pa-t~s by hei~ht):
PV~ 100 part.s pht.halat.e plasticisel- 125 part.s ~ par~t~i stabiliser 2 parts l~lL)r-icclllt]~ part,s ~he o~ter cheath c~f' cro~-lin~ed ~\'0-ba,~ed insulation material may be of convent.ional composition, such sheath materials ha~ing been used for cables, as previously ment.ioned; as compared with the jackets of this type of material pre~iously used, the sheath of the present in-ention is of sub.st,antially uniform thick-ness around the cable so that, the latter has ~ood flexibility.
The det,ailed formulat,ion of such sheath materials including suitable cross-linking agents therefor-e and suitable radiation dosages to obt.ain the de.sired le~el of cross-linking~ will be known to t,hose skilled in the art.
A preferred sheath composition is, for example, as follows (all parts by weight):
P~'C 100 parts phthalate plasticiser 60 parts clay 20 parts antimony based flame retardant. ~ parts st.abiliser 7 parts lubricant 1 part sensitiser ~ parts
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A low voltage electric cable which comprises a plur-ality of insulated conductors which are contained within an insulating 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 insula-tion composition, the sheath being of substantially uniform cross-sectional thickness and being free of longitudinally extend-ing ribs.
2. A cable as set forth in claim 1, wherein said thermo-plastic polymer of the bedding layer is selected from the group consisting of polyvinyl chloride, ethylene-vinyl acetate copoly-mer, ethylene-propylene copolymer, and ethylene-propylene-diene monomer copolymer.
3. A cable as set forth in claim 1, wherein said bedding layer comprises 60 to 80% by weight of at least one inorganic filler.
4. A cable as set forth in claim 1, wherein the inorganic filler of said bedding layer is chalk or whiting.
5. A cable as set forth in claim 1, wherein the composi-tion of said bedding layer comprises:
6. A cable as set forth in claim 1, wherein the composition of said outer sheath comprises:
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8417496 | 1984-07-09 | ||
| GB08417496A GB2161644B (en) | 1984-07-09 | 1984-07-09 | Flexible electric cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1250914A true CA1250914A (en) | 1989-03-07 |
Family
ID=10563639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000486459A Expired CA1250914A (en) | 1984-07-09 | 1985-07-08 | Flexible electric cables |
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) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR8705104A (en) * | 1987-08-26 | 1989-04-11 | Pirelli Brasil | EXTRA HIGH VOLTAGE CABLE WITH EXTRUDED INSULATION |
| FR2871285B1 (en) * | 2004-06-07 | 2006-09-08 | Nexans Sa | CABLE COMPRISING SEVERAL ISOLATED CONDUCTORS ENVELOPED IN THE SAME SHEATH AND METHOD OF MANUFACTURING SUCH A CABLE |
| 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 |
| CN104575729A (en) * | 2014-12-30 | 2015-04-29 | 安徽顺驰电缆有限公司 | Cable |
| 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 |
| 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 |
Family Cites Families (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 |
| GB1583956A (en) * | 1977-03-10 | 1981-02-04 | Bicc Ltd | Electric cables |
| GB1583957A (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 |
| IT1165372B (en) * | 1979-11-15 | 1987-04-22 | Pirelli | LOW VOLTAGE CABLE WITH PERFECTED INSULATOR |
-
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 AU AU44725/85A patent/AU4472585A/en not_active Abandoned
- 1985-07-09 MX MX205927A patent/MX158536A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| IT8521423A0 (en) | 1985-07-03 |
| AU4472585A (en) | 1986-01-16 |
| GB8417496D0 (en) | 1984-08-15 |
| MX158536A (en) | 1989-02-09 |
| GB2161644B (en) | 1987-11-11 |
| IT1185182B (en) | 1987-11-04 |
| BR8503250A (en) | 1986-03-25 |
| GB2161644A (en) | 1986-01-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |