CA1104394A - Longitudinally watertight light-wave conducting cable - Google Patents
Longitudinally watertight light-wave conducting cableInfo
- Publication number
- CA1104394A CA1104394A CA306,069A CA306069A CA1104394A CA 1104394 A CA1104394 A CA 1104394A CA 306069 A CA306069 A CA 306069A CA 1104394 A CA1104394 A CA 1104394A
- Authority
- CA
- Canada
- Prior art keywords
- light
- conducting cable
- wave
- wave conducting
- filler material
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/44384—Means specially adapted for strengthening or protecting the cables the means comprising water blocking or hydrophobic materials
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
- Insulated Conductors (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Organic Insulating Materials (AREA)
- Sealing Material Composition (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a light-wave conducting cable, the free space be-tween the sheath and the light-wave conductor is filled with a substance which is fluid when introduced, but which, by subsequent cross-linking, assumes a resilient, no longer fluid, consistency. Materials suitable for this purpose are silicone resin, polyester resin, polyurethane rubber or expanded poly-styrene. By this means the cable is made watertight in the longitudinal direction. The material, after cross-linking, will not flow from the ends of the cable, but does still allow movement of the conductor within the casing.
In a light-wave conducting cable, the free space be-tween the sheath and the light-wave conductor is filled with a substance which is fluid when introduced, but which, by subsequent cross-linking, assumes a resilient, no longer fluid, consistency. Materials suitable for this purpose are silicone resin, polyester resin, polyurethane rubber or expanded poly-styrene. By this means the cable is made watertight in the longitudinal direction. The material, after cross-linking, will not flow from the ends of the cable, but does still allow movement of the conductor within the casing.
Description
33~
The invention relates to a longitudinally watertight light-wave conducting cable having a loose sheath. A cable having a loose sheath is preferred, since this is the only way to decouple the delicate light-conducting fibres from stresses applied from the outside and to obtain a ~able with low damping characteristics. However, the space left between the light-conducting fibre and the loose sheath has the disadvantage that the fibre is exposed to other, not precisely predictable influences. For instance, a microclimate may arise in this cavity and may affect the surface of the fibre. Furthermore, a hollow design cannot be used for purposes in which watertightness is requi~dd; Movements of the fibre at the end of the core may affect the load-carrying capability of the said fibre.
It is the purpose of the invention to overcome these ~isadvantages without relinquishing the advantages provided by the mobility of the `
light-conducting fibre in the sheath.
This purpose is achieved in that a viscous f~uid, which can no longer flow or trickle in the cable7 is introduced into the loose sheath.
With an appropriate choice of material, the filler according to the invention constitutes a longitudinally watertight closure for the cable and also allows a filler, with predictable chemical reactions to be introduced for various purposes and other various thermal or chemical conditions. It may therefore also be used with advantage for protection against corrosion, thus possibly eliminating other surface treatment of the fibre. It is of particular importance, however, for the fibre to retain sufficient mobili~y in spite of the filled sheath, in order to avoid ex-pansion and compression, and therefore changes in the damping characteristics.
It is desirable for the core to be filled during production, but this requires that the filler be sufficiently fluid to allow it to be introduced into the sheath with the fibre as a result of the drag-flow produced by the said fibre, although this must not disturb the production of the fibre and sheath by 1~}4399~
unwanted cooling procedures or by preventing compensating pro-cesses during production. It is also desirable for the filler to develop, in its final condition, a viscosity which prevents it from flowing out of the core, but still allows the light-conduct-ing fibre to move, even if slowly. In addition to this, the cross-linking time must be long enough to permit the use of large quantities of filler.
In accordance with this invention, there is provided a light-wave conducting cable which is longitudinally watertight, comprising at least one light_wave conductor loosely disposed in a sheath and a filler material disposed around said light wave conductor in said sheath, said filler material comprising a non-flowing viscous material.
According to a preferred example of embodiment of the invention, a weakly cross-linking silicone resin may be used as the fi]ler material. This substance meets all of the above requirements adequately, thus allowing the purpose of the invention to be fulfilled.
It is also possible to use polyester resins, thermo-plastic polyurethane rubber or expanded polystyrene in oil.These materials also fulfil the said requirements, the choice thereof being governed by the various purposes for which the cable is to be used and by the corresponding mechcmical, chemical and thermal behaviour of the material.
; :.
. ,, ~,
The invention relates to a longitudinally watertight light-wave conducting cable having a loose sheath. A cable having a loose sheath is preferred, since this is the only way to decouple the delicate light-conducting fibres from stresses applied from the outside and to obtain a ~able with low damping characteristics. However, the space left between the light-conducting fibre and the loose sheath has the disadvantage that the fibre is exposed to other, not precisely predictable influences. For instance, a microclimate may arise in this cavity and may affect the surface of the fibre. Furthermore, a hollow design cannot be used for purposes in which watertightness is requi~dd; Movements of the fibre at the end of the core may affect the load-carrying capability of the said fibre.
It is the purpose of the invention to overcome these ~isadvantages without relinquishing the advantages provided by the mobility of the `
light-conducting fibre in the sheath.
This purpose is achieved in that a viscous f~uid, which can no longer flow or trickle in the cable7 is introduced into the loose sheath.
With an appropriate choice of material, the filler according to the invention constitutes a longitudinally watertight closure for the cable and also allows a filler, with predictable chemical reactions to be introduced for various purposes and other various thermal or chemical conditions. It may therefore also be used with advantage for protection against corrosion, thus possibly eliminating other surface treatment of the fibre. It is of particular importance, however, for the fibre to retain sufficient mobili~y in spite of the filled sheath, in order to avoid ex-pansion and compression, and therefore changes in the damping characteristics.
It is desirable for the core to be filled during production, but this requires that the filler be sufficiently fluid to allow it to be introduced into the sheath with the fibre as a result of the drag-flow produced by the said fibre, although this must not disturb the production of the fibre and sheath by 1~}4399~
unwanted cooling procedures or by preventing compensating pro-cesses during production. It is also desirable for the filler to develop, in its final condition, a viscosity which prevents it from flowing out of the core, but still allows the light-conduct-ing fibre to move, even if slowly. In addition to this, the cross-linking time must be long enough to permit the use of large quantities of filler.
In accordance with this invention, there is provided a light-wave conducting cable which is longitudinally watertight, comprising at least one light_wave conductor loosely disposed in a sheath and a filler material disposed around said light wave conductor in said sheath, said filler material comprising a non-flowing viscous material.
According to a preferred example of embodiment of the invention, a weakly cross-linking silicone resin may be used as the fi]ler material. This substance meets all of the above requirements adequately, thus allowing the purpose of the invention to be fulfilled.
It is also possible to use polyester resins, thermo-plastic polyurethane rubber or expanded polystyrene in oil.These materials also fulfil the said requirements, the choice thereof being governed by the various purposes for which the cable is to be used and by the corresponding mechcmical, chemical and thermal behaviour of the material.
; :.
. ,, ~,
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A light-wave conducting cable which is longitudinally watertight, comprising at least one light-wave conductor loosely disposed in a sheath and a filler material disposed around said light-wave conductor in said sheath, said filler material comprising a non-flowing viscous material.
2. A light-wave conducting cable according to claim 1, characterized in that said filler material comprises a weakly cross-linking silicone resin.
3. A light-wave conducting cable according to claim 1, characterized in that said filler material comprises a polyester resin.
4. A light-wave conducting cable according to claim 1, characterized in that said filler material comprises a thermo-plastic polyurethane rubber.
5. A light-wave conducting cable according to claim 1, characterized in that said filler material comprises an expanded polystyrene in oil.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2728642A DE2728642B2 (en) | 1977-06-24 | 1977-06-24 | Longitudinally watertight fiber optic cable |
| DEP2728642.6 | 1977-06-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1104394A true CA1104394A (en) | 1981-07-07 |
Family
ID=6012315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA306,069A Expired CA1104394A (en) | 1977-06-24 | 1978-06-22 | Longitudinally watertight light-wave conducting cable |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA1104394A (en) |
| DE (1) | DE2728642B2 (en) |
| NL (1) | NL173562C (en) |
| SE (1) | SE440561B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4840454A (en) * | 1986-09-02 | 1989-06-20 | Siemens Aktiengesellschat | Optical cable and method of manufacturing |
| US5657410A (en) * | 1993-05-13 | 1997-08-12 | Siemens Aktiengesellschaft | Filler for an optical transmission element having at least one optical waveguide |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0010576B1 (en) * | 1978-10-30 | 1983-10-19 | Siemens Aktiengesellschaft | Polyurethane based filler mass for longitudinally sealing electrical or optical telecommunication cables or cable connections and connecting parts and cables provided with this filler mass |
| JPS55100507A (en) * | 1979-01-26 | 1980-07-31 | Kokusai Denshin Denwa Co Ltd <Kdd> | Optical fiber submarine cable |
| DE2907704B2 (en) * | 1979-02-28 | 1981-03-12 | Siemens AG, 1000 Berlin und 8000 München | Stranding element for optical cables |
| DE2930801C2 (en) * | 1979-07-28 | 1981-12-03 | AEG-Telefunken Kabelwerke AG, Rheydt, 4050 Mönchengladbach | Fiber optic cable |
| DE2944073C2 (en) * | 1979-10-31 | 1990-01-04 | Siemens AG, 1000 Berlin und 8000 München | Fiber optic cable and process for its manufacture |
| DE2944997C2 (en) * | 1979-11-08 | 1981-03-26 | Kabel Rheydt AG, 41238 Mönchengladbach | Light guide arrangement |
| DE2946027C2 (en) * | 1979-11-14 | 1982-05-06 | Siemens AG, 1000 Berlin und 8000 München | Longitudinally watertight fiber optic cable and process for its manufacture |
| DE3010353C1 (en) * | 1980-03-18 | 1981-10-15 | Siemens AG, 1000 Berlin und 8000 München | Optical transmission element and process for its manufacture |
| GB2083054B (en) * | 1980-08-26 | 1984-03-28 | Standard Telephones Cables Ltd | Water-blocking polyurethane compound for cables |
| DE3167332D1 (en) * | 1980-10-01 | 1985-01-03 | Bicc Plc | Method of and arrangement for manufacturing an optical cable element |
| IN157268B (en) * | 1980-10-18 | 1986-02-22 | British Insulated Callenders | |
| DE3111963C2 (en) * | 1981-03-26 | 1986-07-17 | Siemens AG, 1000 Berlin und 8000 München | Method and device for the production of a fiber optic cable |
| DE3118172A1 (en) * | 1981-05-08 | 1982-11-25 | Philips Kommunikations Industrie AG, 8500 Nürnberg | Longitudinally watertight optical communication cable |
| DE3147137A1 (en) * | 1981-11-27 | 1983-06-01 | Siemens AG, 1000 Berlin und 8000 München | Optical transmission element having a fibrous optical waveguide and process for its production |
| DE3201981A1 (en) * | 1982-01-22 | 1983-08-04 | Siemens AG, 1000 Berlin und 8000 München | Fiber optic cable with sheathed fiber optic cables |
| DE3312649A1 (en) * | 1983-04-08 | 1984-10-11 | ANT Nachrichtentechnik GmbH, 7150 Backnang | Sealing material and apparatus for fixing an optical waveguide in a protective tube |
| DE3337863A1 (en) * | 1983-10-18 | 1985-04-25 | Siemens AG, 1000 Berlin und 8000 München | CONCENTRALLY DESIGNED OPTICAL AIR OR SEA CABLE |
| EP0160778B2 (en) * | 1984-03-03 | 1996-07-24 | Mitsubishi Cable Industries, Ltd. | Waterproof optical fiber cable |
| DE3822885C2 (en) * | 1987-07-06 | 1994-06-01 | Asahi Optical Co Ltd | Optical cable and process for its manufacture |
| DE3840353A1 (en) * | 1988-11-30 | 1990-06-07 | Rheydt Kabelwerk Ag | Buffered optical fibre |
| DE3914368A1 (en) * | 1989-04-29 | 1990-10-31 | Rheydt Kabelwerk Ag | OPTICAL CORE |
| DE4110654A1 (en) * | 1991-04-02 | 1992-10-08 | Siemens Ag | Ultraviolet curable optical cable fillers for heat resistance - comprise oil material, thixotropic agent and UV-reactive silicone (meth)acrylate] for light conductor mobility |
| DE4119881C1 (en) * | 1991-06-17 | 1992-10-08 | Ant Nachrichtentechnik Gmbh, 7150 Backnang, De | Fibre=optic cable containing several optical fibres - has sheath including strain-relieving filaments for protecting fibres surrounded by incompressible gel |
| EP0866992B1 (en) * | 1995-12-11 | 2000-01-26 | Siemens Aktiengesellschaft | Optical transmission component comprising a filler compound and process for its production |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1415804A1 (en) * | 1961-12-14 | 1969-01-16 | Kabel Metallwerke Ghh | Process for sealing spun, braided or knitted metallic conductors |
| US3683104A (en) * | 1971-01-07 | 1972-08-08 | Dow Chemical Co | Heat resistant cable |
| BE792621A (en) * | 1971-12-15 | 1973-03-30 | Western Electric Co | PROCESS AND PRODUCT FOR DISCHARGING INFILTRATED WATER IN TELEPHONE AND SIMILAR CABLES |
| DE2302662C2 (en) * | 1973-01-19 | 1983-09-01 | Siemens AG, 1000 Berlin und 8000 München | Communication cable |
| GB1445732A (en) * | 1973-06-21 | 1976-08-11 | Bicc Ltd | Optical guides |
| GB1451232A (en) * | 1973-06-28 | 1976-09-29 | Bicc Ltd | Optical guidesd |
| DE2361207A1 (en) * | 1973-12-06 | 1975-06-12 | Aeg Telefunken Kabelwerke | Telecommunication cable with plastic insulated conductors - has sealing filler against longitudinal water penetration |
| DE2415635A1 (en) * | 1974-03-30 | 1975-10-23 | Kabel Metallwerke Ghh | Water-tight communications cable - is produced by injecting styrene monomer under outer sleeve of cable and hardening or foaming |
| DE2421670B2 (en) * | 1974-05-04 | 1976-11-25 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | DEVICE FOR CURVED FINISHING OF THE TEETH FROM EXTERNAL PRE-TOOTHED PTO SHAFT |
| DE2438388A1 (en) * | 1974-08-07 | 1976-02-26 | Aeg Telefunken Kabelwerke | Longitudinal waterproof communication cable - has polyurethane foam packing between core and welded waterproof jacket |
| DE2641557C3 (en) * | 1976-09-15 | 1979-05-10 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Filling compound for polyolefin-insulated communication cables and for cable sleeves |
| DE2926891C2 (en) * | 1979-07-03 | 1982-06-09 | Siemens AG, 1000 Berlin und 8000 München | Electric cables, in particular communication cables |
-
1977
- 1977-06-24 DE DE2728642A patent/DE2728642B2/en not_active Ceased
-
1978
- 1978-06-20 NL NLAANVRAGE7806672,A patent/NL173562C/en not_active IP Right Cessation
- 1978-06-22 CA CA306,069A patent/CA1104394A/en not_active Expired
- 1978-06-22 SE SE7807155A patent/SE440561B/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4840454A (en) * | 1986-09-02 | 1989-06-20 | Siemens Aktiengesellschat | Optical cable and method of manufacturing |
| US5657410A (en) * | 1993-05-13 | 1997-08-12 | Siemens Aktiengesellschaft | Filler for an optical transmission element having at least one optical waveguide |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2728642B2 (en) | 1981-02-05 |
| SE440561B (en) | 1985-08-05 |
| SE7807155L (en) | 1978-12-25 |
| NL173562B (en) | 1983-09-01 |
| NL7806672A (en) | 1978-12-28 |
| NL173562C (en) | 1984-02-01 |
| DE2728642A1 (en) | 1979-01-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |