EP0759624A1 - Câble électrique de télécommunication - Google Patents
Câble électrique de télécommunication Download PDFInfo
- Publication number
- EP0759624A1 EP0759624A1 EP96104781A EP96104781A EP0759624A1 EP 0759624 A1 EP0759624 A1 EP 0759624A1 EP 96104781 A EP96104781 A EP 96104781A EP 96104781 A EP96104781 A EP 96104781A EP 0759624 A1 EP0759624 A1 EP 0759624A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cable
- screen
- shielding
- foils
- cable according
- 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.)
- Withdrawn
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
- H01B11/10—Screens specially adapted for reducing interference from external sources
- H01B11/1016—Screens specially adapted for reducing interference from external sources composed of a longitudinal lapped tape-conductor
-
- 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
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
- H01B13/2613—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping
- H01B13/262—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping of an outer metallic screen
Definitions
- the invention relates to an electrical cable for transmitting messages, in which at least one transmission element consisting of insulated electrical conductors is arranged in a cable core, in which the cable core is surrounded by a metallic screen and in which a jacket made of insulating material is fitted over the screen.
- Such cables or lines are used, for example, in data technology, in open-loop and closed-loop control technology or in general in communications technology.
- These cables are equipped with a metallic shield or a metallic shield to protect the transmission paths against external interference fields.
- the shield also prevents interference radiation from such a cable.
- a dense shield is required, which must also be effective in areas of more than 100 MHz, for example for data cables.
- umbrellas consist, for example, of braids or ropes made of copper wires. Such umbrellas are no longer leakproof even at double frequencies at higher frequencies. Their application to the cable core is also complex. Shields designed as closed tubes, such as those used for high-frequency cables, are also expensive to manufacture. Cables equipped with it are also stiff.
- the invention has for its object to develop the above-mentioned cable so that it is tightly shielded with simple manufacture even at very high frequencies.
- This cable can be produced in a simple manner using machines which are customary in cable technology.
- the two shield foils and the jacket can be molded around the cable core in one operation.
- the cable then has a two-layer shield, the two layers of which, apart from the very narrow gaps at the overlap points, are each individually tubular. Both layers are therefore already suitable as umbrellas.
- the offset of the overlap points of both shielding foils in the circumferential direction results overall in an effective shielding of the cable core even at very high frequencies, since the narrow gap remaining in the two layers of the shield in the respective overlap point is covered by the respective other layer.
- the metallic strips used for the shielding foils can be made very thin so that the cable remains bendable.
- the two shielding foils not only protect the cable core from an electromagnetic point of view, they are also an effective diffusion barrier for moisture.
- an insulating intermediate layer is applied between the two screen films.
- a screen constructed in this way has a low screen attenuation or a high coupling resistance, in particular at very high frequencies. If the two shielding films are firmly connected to one another via the intermediate layer, the result is a kind of sandwich construction, which prevents the screen from kinking when the cable is bent, for example, when it is wound on a spool.
- the electrical communication cable K shown in cross section in FIG. 1 - hereinafter referred to as "cable K" - has four transmission elements 1, each of which is designed as a wire with an insulated metallic conductor.
- the conductors are preferably made of copper.
- a metallic screen 2 is attached over the cable core S formed by the transmission elements 1. It consists of copper or aluminum, for example. Its more precise structure is shown in FIG. 2.
- the screen 2 is surrounded by a jacket 3 made of insulating material, which consists for example of polyethylene or polyvinyl chloride.
- the screen 2 has two screen films 4 and 5, between which an insulating intermediate layer 6 is shown, dotted.
- Both shielding foils 4 and 5 consist of metallic strips which have been formed lengthwise around the cable core S. They have overlap points 7 and 8 which run in the longitudinal direction of the cable K and are offset in relation to one another in the circumferential direction.
- the overlap points 7 and 8 lie diametrically opposite one another. They are then offset from each other by 180 °.
- the two screen films 4 and 5 can be firmly connected to one another in the finished screen 2 by the intermediate layer 6.
- Bare aluminum or copper strips can be used as strips for the shielding foils 4 and 5.
- the tapes can be between 25 ⁇ m and 150 ⁇ m thick. Tapes coated with a plastic can also be used on one side. The coated sides of such tapes can face each other in the finished cable or in the screen 2.
- the bands can also be arranged so that only one layer lies between them, while the other layer is then arranged outside. The coating or coatings then form or form the intermediate layer 6.
- Two strips, of which only one is coated with plastic can also be used for the screen foils 4 and 5. In the overlap points 7 and 8 of uncoated strips, bare metal lies against one another.
- the intermediate layer 6 can also consist of a plastic film attached between the two screen films 4 and 5.
- the plastic of the intermediate layer 6 can be designed as an adhesion promoter.
- a copolymer of ethylene is suitable for this, for example. It becomes effective through the application of heat. The heat required for this is generated, for example, when the jacket 3 is applied.
- a plastic film can be wrapped around the screen films 5. This is particularly advantageous if the two screen foils 4 and 5 are not firmly connected to one another.
- a metallic drain wire can be assigned to each of the two shield foils 4 and 5, which runs over the entire length of the cable K and lies against the respective shield foil.
- a drain wire can be, for example, a tinned copper wire.
- the cable K according to FIG. 1 is produced according to FIG. 3, for example as follows:
- a first metallic band 11 coming from a coil 10 is formed into the shielding film 4 with the overlap point 7 in a shaping device 9.
- the cable core S and all layers applied to the same are moved in the direction of arrow P by the system according to FIG. 3.
- the first band 11 is coated on one side with an adhesion promoter. This layer lies on the outside of the shielding film 4.
- a second metallic band 13 is formed around the shielding film 4 in a shaping device 12 to form the shielding film 5 with the overlap point 8, which is pulled off from a coil 14.
- the tape 13 is also coated on one side with an adhesion promoter. This layer lies inside the shielding film 5.
- the sheath 3 is then applied to the screen 2 of the cable K thus formed from the two bands 11 and 13 by means of an extruder 15. The heat generated thereby activates the adhesion promoter of the two bands 11 and 13, so that the two screen foils 4 and 5 are firmly connected to one another.
- the finished cable K can then be wound up on a spool.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Insulated Conductors (AREA)
- Communication Cables (AREA)
- Manufacturing Of Electric Cables (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19530576 | 1995-08-19 | ||
DE19530576 | 1995-08-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0759624A1 true EP0759624A1 (fr) | 1997-02-26 |
Family
ID=7769913
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96104781A Withdrawn EP0759624A1 (fr) | 1995-08-19 | 1996-03-26 | Câble électrique de télécommunication |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0759624A1 (fr) |
JP (1) | JPH09129040A (fr) |
KR (1) | KR970012800A (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0867891A1 (fr) * | 1997-03-27 | 1998-09-30 | Alcatel | Câble pour la transmission de données et son procédé de fabrication |
CN110931178A (zh) * | 2019-12-09 | 2020-03-27 | 芜湖航天特种电缆厂股份有限公司 | 用于电缆的绕包设备 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2774183B1 (fr) * | 1998-01-26 | 2002-04-26 | Alsthom Cge Alkatel | Cable a tube sensiblement etanche logeant au moins un conducteur optique et un produit absorbant l'hydrogene |
JPH11297132A (ja) * | 1998-04-06 | 1999-10-29 | Sumitomo Electric Ind Ltd | 同軸ケーブルとそれを使った多心ケーブル |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1153152A (en) * | 1965-09-13 | 1969-05-29 | Gen Cable Corp | Telephone Cable Sheath |
US4510346A (en) * | 1983-09-30 | 1985-04-09 | At&T Bell Laboratories | Shielded cable |
GB2161016A (en) * | 1984-06-29 | 1986-01-02 | American Telephone & Telegraph | Bonded sheath cable and methods of and apparatus for making |
US5132491A (en) * | 1991-03-15 | 1992-07-21 | W. L. Gore & Associates, Inc. | Shielded jacketed coaxial cable |
-
1996
- 1996-03-26 EP EP96104781A patent/EP0759624A1/fr not_active Withdrawn
- 1996-06-20 KR KR1019960022525A patent/KR970012800A/ko not_active Application Discontinuation
- 1996-08-16 JP JP8216200A patent/JPH09129040A/ja not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1153152A (en) * | 1965-09-13 | 1969-05-29 | Gen Cable Corp | Telephone Cable Sheath |
US4510346A (en) * | 1983-09-30 | 1985-04-09 | At&T Bell Laboratories | Shielded cable |
GB2161016A (en) * | 1984-06-29 | 1986-01-02 | American Telephone & Telegraph | Bonded sheath cable and methods of and apparatus for making |
US5132491A (en) * | 1991-03-15 | 1992-07-21 | W. L. Gore & Associates, Inc. | Shielded jacketed coaxial cable |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0867891A1 (fr) * | 1997-03-27 | 1998-09-30 | Alcatel | Câble pour la transmission de données et son procédé de fabrication |
FR2761515A1 (fr) * | 1997-03-27 | 1998-10-02 | Alsthom Cge Alcatel | Cable pour la transmission de donnees et son procede de fabrication |
US6259019B1 (en) | 1997-03-27 | 2001-07-10 | Alcatel | Cable for transmitting data and method of manufacturing it |
CN110931178A (zh) * | 2019-12-09 | 2020-03-27 | 芜湖航天特种电缆厂股份有限公司 | 用于电缆的绕包设备 |
Also Published As
Publication number | Publication date |
---|---|
JPH09129040A (ja) | 1997-05-16 |
KR970012800A (ko) | 1997-03-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE CH DE ES FR GB IT LI PT |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19970827 |