WO2002078145A1 - Industrial production method for cold-shrink joints and terminations with multiple elastic walls - Google Patents
Industrial production method for cold-shrink joints and terminations with multiple elastic walls Download PDFInfo
- Publication number
- WO2002078145A1 WO2002078145A1 PCT/IT2002/000184 IT0200184W WO02078145A1 WO 2002078145 A1 WO2002078145 A1 WO 2002078145A1 IT 0200184 W IT0200184 W IT 0200184W WO 02078145 A1 WO02078145 A1 WO 02078145A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tubes
- production method
- industrial production
- layers
- producing
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
- H02G15/184—Cable junctions protected by sleeves, e.g. for communication cable with devices for relieving electrical stress
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/02—Cable terminations
- H02G15/06—Cable terminating boxes, frames or other structures
- H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress
- H02G15/068—Cable terminating boxes, frames or other structures with devices for relieving electrical stress connected to the cable shield only
Definitions
- a termination and/or joint and/or other component, to be called cold-shrink has to be made out of elastic materials as natural rubber and/or synthetic rubber and/or other material with similar characteristics, because it has to be expanded, firstly, to a diameter slightly larger than that one on which it will be larger installed and then, thanks to its intrinsic elastic memory, to shrink strongly up to insure the wanted pressure on the cables, without using external force or power.
- the expanding process takes place normally in the factory and it is one of the production cycle phase.
- the elastic tube is expanded and parked on a rigid support, having generally cylindric shape and an internal diameter larger than that one on wich the elastic tube has to be applied.
- the expanded preassembied tube will be stored up to the selling or, better, to the final application.
- the tube is not loosing too much elastic memory or force; namely it has to keep the property of shrinking almost to the primary diameter and shape it has before being expanded and, overall, it has to keep sufficient elastic force.
- the final elastic tube is formed by one or more layers of rubber, each layer having a different performance.
- the internal layer will make the electrical stress control relief and will be made out of filled rubbery compound.
- the external layer will make the mechanical sealing of the joint or termination and the needed electrical insulation grade and then it will be made out of different rubbery compound.
- the eventual intermediate layers can make, time by time, the various functions, both electrical and mechanical, contributing in increasing the final features of the product.
- the different characteristics of the rubbery compound used for producing each layer in addition to give those electrical properties tipical of the function, produce also some mechanical properties which not always are desirable and/or which reduce the range of applications and/or make difficult the assembling in the factory and/or reduce the warehouse shelf life.
- the rigid tubular support has its own length LS and its own diameter DiS and DeS In fig.
- each rubbery tubular layer forming the item is produced separately by the processing technique more suitable to give it those properties mechanical and/or electrical and/or superficial or others which are desired (see fig. 3, fig. 4, fig. 5 and fig. 6) .
- each component will be those ones more or less corresponding to the application to be made, while the diameters and walls thickness will be fixed with particular care to prevent the fore-said phoenomena of elastic memory loss, to simplify the preassembling in the factory and to reduce the size range to be stocked.
- the internal tube (fig. 3) has to be made out of a particular filled compound, which reduces the elastic memory of the same, the primary diameter of the tube, will be not far away from the diameter of the support on which it has to be positioned, in order to reduce the risk of damage during the expansion phase.
- This choice involves that this layer alone will be not suitable for the various application diameters to which is destined.
- the external layer (fig. 5) will be realized having as target to insure the suitable memory and elastic force to the whole item, besides to other features capable to tighten, by the due force, the internal layers on the final application diameter.
- the plastic rigid support (fig. 6) has the outside diameter DeS
- the first (internal) rubber tube (fig. 3) may be produced with a diameter Dil not for away from DeS;
- the intermediate rubber tubes (fig. 4) may have primary diameters conforming to the desired characteristics for the application;
- the last (external) rubber tube (fig. 5) may have primary internal diameter Di2 ⁇ DeS or Di2 «DeS, namely even smaller than the diameter of the rigid support.
- the elastic force and memory may be assigned only to the external tubes (fig. 5) , which generally may be produced by rubbery compound having excellent elastic characteristics and excellent compression set (elastic memory).
- the different rubber tubes, forming the various layers will be expanded and positioned on the support one on the previous one, beginning from the "internal tube", as shown in fig. 2.
Landscapes
- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Manufacturing Of Electrical Connectors (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02722673A EP1285482A1 (en) | 2001-03-28 | 2002-03-22 | Industrial production method for cold-shrink joints and terminations with multiple elastic walls |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2001AV000004A ITAV20010004A1 (en) | 2001-03-28 | 2001-03-28 | "INDUSTRIAL PRODUCTION METHOD OF SELF-STRINGING JOINTS AND TERMINALS WITH SEVERAL TECHNICAL WALLS, WITHOUT THE ADOPTION OF CO-MOLDING AND CO |
ITAV2001A000004 | 2001-03-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002078145A1 true WO2002078145A1 (en) | 2002-10-03 |
Family
ID=11437697
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IT2002/000184 WO2002078145A1 (en) | 2001-03-28 | 2002-03-22 | Industrial production method for cold-shrink joints and terminations with multiple elastic walls |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1285482A1 (en) |
IT (1) | ITAV20010004A1 (en) |
WO (1) | WO2002078145A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3131809A1 (en) * | 2022-01-12 | 2023-07-14 | Nexans | METHOD FOR MANUFACTURING AN ELECTRIC CABLE JUNCTION, JUNCTION AND ASSOCIATED CABLE |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3816640A (en) * | 1973-07-12 | 1974-06-11 | Minnesota Mining & Mfg | Multitube cable splice assembly and method of making same |
EP0780949A1 (en) * | 1995-12-23 | 1997-06-25 | Minnesota Mining And Manufacturing Company | Universal cable adapter, cable joint using the adapter and method of making the same |
WO1997032381A1 (en) * | 1996-03-01 | 1997-09-04 | Minnesota Mining And Manufacturing Company | Closure with flowable material and reinforcing core |
WO1998027631A1 (en) * | 1996-12-16 | 1998-06-25 | Minnesota Mining And Manufacturing Company | Stress control for termination of a high voltage cable |
-
2001
- 2001-03-28 IT IT2001AV000004A patent/ITAV20010004A1/en unknown
-
2002
- 2002-03-22 EP EP02722673A patent/EP1285482A1/en not_active Withdrawn
- 2002-03-22 WO PCT/IT2002/000184 patent/WO2002078145A1/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3816640A (en) * | 1973-07-12 | 1974-06-11 | Minnesota Mining & Mfg | Multitube cable splice assembly and method of making same |
EP0780949A1 (en) * | 1995-12-23 | 1997-06-25 | Minnesota Mining And Manufacturing Company | Universal cable adapter, cable joint using the adapter and method of making the same |
WO1997032381A1 (en) * | 1996-03-01 | 1997-09-04 | Minnesota Mining And Manufacturing Company | Closure with flowable material and reinforcing core |
WO1998027631A1 (en) * | 1996-12-16 | 1998-06-25 | Minnesota Mining And Manufacturing Company | Stress control for termination of a high voltage cable |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3131809A1 (en) * | 2022-01-12 | 2023-07-14 | Nexans | METHOD FOR MANUFACTURING AN ELECTRIC CABLE JUNCTION, JUNCTION AND ASSOCIATED CABLE |
EP4213325A1 (en) * | 2022-01-12 | 2023-07-19 | Nexans | Method for manufacturing an electrical cable junction, associated junction and cable |
Also Published As
Publication number | Publication date |
---|---|
ITAV20010004A1 (en) | 2002-09-28 |
EP1285482A1 (en) | 2003-02-26 |
ITAV20010004A0 (en) | 2001-03-28 |
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