CA2029417A1 - Process for shielding a folded ribbon cable made of two groups of power and data conductors - Google Patents
Process for shielding a folded ribbon cable made of two groups of power and data conductorsInfo
- Publication number
- CA2029417A1 CA2029417A1 CA 2029417 CA2029417A CA2029417A1 CA 2029417 A1 CA2029417 A1 CA 2029417A1 CA 2029417 CA2029417 CA 2029417 CA 2029417 A CA2029417 A CA 2029417A CA 2029417 A1 CA2029417 A1 CA 2029417A1
- Authority
- CA
- Canada
- Prior art keywords
- conductors
- foil
- composite tape
- ribbon cable
- foil shield
- 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.)
- Abandoned
Links
Landscapes
- Insulated Conductors (AREA)
Abstract
Abstract of the Disclosure:
A process for manufacturing a folded ribbon cable made of two groups of electrically insulated power and data conductors joined between themselves and between the two groups of conductors by flexible webs comprises providing a single foil shield or a composite tape made of a foil shield bonded to a plastic film, longitudinally folding a portion of the width of the single foil shield or composite tape around one of the groups of conductors, longitudinally folding the other group of conductors over the one group to form a core while simultaneously wrapping the remaining width of foil shield or composite tape around the core or around the other group of conductors, and providing a jacket over the core to form the folded ribbon cable.
A process for manufacturing a folded ribbon cable made of two groups of electrically insulated power and data conductors joined between themselves and between the two groups of conductors by flexible webs comprises providing a single foil shield or a composite tape made of a foil shield bonded to a plastic film, longitudinally folding a portion of the width of the single foil shield or composite tape around one of the groups of conductors, longitudinally folding the other group of conductors over the one group to form a core while simultaneously wrapping the remaining width of foil shield or composite tape around the core or around the other group of conductors, and providing a jacket over the core to form the folded ribbon cable.
Description
2 0 ~ ~ ~ 1 7 PROC~88 FOR 8HIELDING a FO~DED RIBBON CABLE MADE OF TWO
~RO~P8 OF PO~ER AND DATa CONDUCTOR8 This invention relates to a process for shielding a folded ribbon cable made of two groups of power and data conductors so as to prevent electromagnetic interference between the two groups of conductors.
When wiring a new building, it has been the practice up to now to use separate conductors for carrying power and data communication. Thus, power conductors and data conductors are installed separately which is more costly than it would be if the two groups of conductors were formed together and assembled in a single operation.
However, the problem is to economically shield the two groups o~ conductors from ea¢h other.
An attempt to integrate and shield two groups of power and data conductors is disclosed in U.S. patent application No. 496,979 filed March 21, 1990, and assigned to Smart House Ltd. Partnership, of which the assignee of the present application i~ a Licensee. In this patent application there is disclosed a folded ribbon cable having integrated power and data conductors shielded with a shield which is integrally formed with the ribbon cable.
. ~ ' ., : ~
Applicant has developed a new shielding process which allows manufacturing of a folded ribbon cable having integrated power and data conductors at a much more reasonable cost.
The process in accordance with the present invention comprises the steps of providing a single foil shield or a composite tape made of a foil shield bonded to a plastic film, longitudinally folding a portion of the width of the foil shield or composite tape around one of the groups of conductors, preferably the data conductors, longitudinally folding the other group of conductors over the one group to form a core while simultaneously wrapping the remaining width of foil shield or composite tape around the core or around the other group of conductors, and providing a jacket over the core to form a folded ribbon cable.
Longitudinal folding of a portion of the foil shield or composite tape around one group of conductors and folding of the other group of conductors over the one group while wrapping the rest of the foil shield or composite tape around the folded ribbon cable i5 preferably done in a single continuou6 operation.
The shield is preferably in the form of a composite tape made of a foil shield bonded to the edge of foil free plastic film or a composite tape made of a foil shield bonded over its full width to a wider foil free plastic film. It may also be a compo6ite tape made of a foil .. ~ :. ~
~, ~.. - .. , , . .: . ,.
202~17 shield bonded to a plastic film of the same width. It may also be a composite tape made of two foil shields laminated with a plastic film between them used as is or bonded to the edge of a plastic film or bonded over its full width to a wider plastic film.
The composite tape may also have different constructions and not be limited to foil or film thickness or tensile strength. For some composite tape constructions, a glass scrim may be bonded to a foil, used as is or bonded betw-en a foil and film, or between two foils and used as is or bonded between a foil, film and foil to give added strength to the composite tape. The glass scrim may be of any thickness or tensile strength.
The invention will now be disclosed, by way of example, with reference to the accompanying drawings in which:
Figure 1 is a diagram of a ~acketed folded ribbon cable with composite shield and core wrap tape;
Figure 2 i8 a diagram Or a ~acketed folded overall shielded ribbon cable with composite shield and core wrap tape; and Figure 3 is a diagram illustrating a continuous shielding operation which is done at the same time as the ribbon cable folding operation.
Referring to Figure 1, there is shown a folded ribbon cable a~sembly including a flat ribbon cable lO
. .
202~17 having three insulated power conductors 11 and a plurality of smaller gauge insulated data conductors 12 for data communication. The power and data conductors are joined together between themselves and between the two groups of conductors by thin webs 13. This ribbon cable is shielded with a composite tape comprising a foil shield 14 bonded over its full width to the edge of a wider foil free plastic film 15. The foil shield portion of the composite tape is longitudinally folded about the data conductors.
The power conductors 11 are folded over the data conductors to form a cable core and the plastic film portion 15 of the composite tape simultaneously wrapped around the cable core or around the power conductors as shown in dashed lines. A thermoplastic jacket 16 is applied over the core. A drain wire 17 may be used. It makes electrical contact with the foil shield and is used for shield termination.
The purpose of the shield 14 i8 to shield the data conductors from electromagneti¢ interference generated by the power conductors and to shield the power conductors from interference generated by the data conductors. The purpose of the overall foil free core wrap film is to maintain the core in its desired profile, prevent overall ~acket adherence and act as a dielectric barrier to the folded ribbon cable. The foil is a conductive type foil, i.e. aluminum or copper.
.. . . .... . .
,. .
~ ., . ;;~. . . :' Referring to Figure 2, there is shown a folded ribbon cable as in Figure 1. However, in this illustration, the ribbon cable is folded with a composite core wrap/shield tape 18 applied about the folded ribbon cable. Thermoplastic jacket and drain wire are provided as in Figure 1.
The purpose of tape 18 is the same as in Figure 1.
In addition, it shields the folded ribbon cable from electromagnetic interference generated by other cables or shields other cables from electromagnetic interference generated by the folded ribbon cable.
Referring to Figure 3, there is shown how a composite foil shield 14 and core wrap tape 15 may be continuously applied in one operation at the same time that the flat ribbon cable 10 i8 being folded.
As illustrated in Figure 3, the flat ribbon cable 10, the flat composite foil shield/core wrap film 14, 15, and the drain wire 17 are payed off feeding equipment 19 into an appropriate folding and ~orming equipment 20 to produce the un-~acketed assembly 21. The un-jacketed assembly is fed to an extrusion equipment 22 to produce the jacketed folded cable assembly shown in Figure 1. The jacketed cable is wound up on takeup equipment 23. This process is an in-line payoff/forming/overall jacket extrusion operation. Appropriate packaging equipment could replace takeup 23. The jacketing process could be a separate step.
. , ,, ~ ~ .
, 2029~17 The equipment shown in Figure 3 could be used for making the folded cable assembly shown in Figure 2 wherein a composite core wrap/shield tape 18 is used instead of a composite foil shield 14/core wrap film lS.
To hold the composite shield and core wrap tape in place, the un-;acketed assembly 21, as per Figure 3, may have a overall helical binder tape. Another method could be adhesive bonding at the core tape overlap 24. Adhesive bonding could take place either at processing or the tape could have a pre-adhesive strip which is activated at processing. No specific method may be required, the tape itself providing the necessary action.
Although the invention has been disclosed with reference to a preferred embodiment, it is to be understood that it is not limited to such embodiment and that other alternatives are also envisaged within the scope of the following claims.
.
: .
.. .~ . ' ,
~RO~P8 OF PO~ER AND DATa CONDUCTOR8 This invention relates to a process for shielding a folded ribbon cable made of two groups of power and data conductors so as to prevent electromagnetic interference between the two groups of conductors.
When wiring a new building, it has been the practice up to now to use separate conductors for carrying power and data communication. Thus, power conductors and data conductors are installed separately which is more costly than it would be if the two groups of conductors were formed together and assembled in a single operation.
However, the problem is to economically shield the two groups o~ conductors from ea¢h other.
An attempt to integrate and shield two groups of power and data conductors is disclosed in U.S. patent application No. 496,979 filed March 21, 1990, and assigned to Smart House Ltd. Partnership, of which the assignee of the present application i~ a Licensee. In this patent application there is disclosed a folded ribbon cable having integrated power and data conductors shielded with a shield which is integrally formed with the ribbon cable.
. ~ ' ., : ~
Applicant has developed a new shielding process which allows manufacturing of a folded ribbon cable having integrated power and data conductors at a much more reasonable cost.
The process in accordance with the present invention comprises the steps of providing a single foil shield or a composite tape made of a foil shield bonded to a plastic film, longitudinally folding a portion of the width of the foil shield or composite tape around one of the groups of conductors, preferably the data conductors, longitudinally folding the other group of conductors over the one group to form a core while simultaneously wrapping the remaining width of foil shield or composite tape around the core or around the other group of conductors, and providing a jacket over the core to form a folded ribbon cable.
Longitudinal folding of a portion of the foil shield or composite tape around one group of conductors and folding of the other group of conductors over the one group while wrapping the rest of the foil shield or composite tape around the folded ribbon cable i5 preferably done in a single continuou6 operation.
The shield is preferably in the form of a composite tape made of a foil shield bonded to the edge of foil free plastic film or a composite tape made of a foil shield bonded over its full width to a wider foil free plastic film. It may also be a compo6ite tape made of a foil .. ~ :. ~
~, ~.. - .. , , . .: . ,.
202~17 shield bonded to a plastic film of the same width. It may also be a composite tape made of two foil shields laminated with a plastic film between them used as is or bonded to the edge of a plastic film or bonded over its full width to a wider plastic film.
The composite tape may also have different constructions and not be limited to foil or film thickness or tensile strength. For some composite tape constructions, a glass scrim may be bonded to a foil, used as is or bonded betw-en a foil and film, or between two foils and used as is or bonded between a foil, film and foil to give added strength to the composite tape. The glass scrim may be of any thickness or tensile strength.
The invention will now be disclosed, by way of example, with reference to the accompanying drawings in which:
Figure 1 is a diagram of a ~acketed folded ribbon cable with composite shield and core wrap tape;
Figure 2 i8 a diagram Or a ~acketed folded overall shielded ribbon cable with composite shield and core wrap tape; and Figure 3 is a diagram illustrating a continuous shielding operation which is done at the same time as the ribbon cable folding operation.
Referring to Figure 1, there is shown a folded ribbon cable a~sembly including a flat ribbon cable lO
. .
202~17 having three insulated power conductors 11 and a plurality of smaller gauge insulated data conductors 12 for data communication. The power and data conductors are joined together between themselves and between the two groups of conductors by thin webs 13. This ribbon cable is shielded with a composite tape comprising a foil shield 14 bonded over its full width to the edge of a wider foil free plastic film 15. The foil shield portion of the composite tape is longitudinally folded about the data conductors.
The power conductors 11 are folded over the data conductors to form a cable core and the plastic film portion 15 of the composite tape simultaneously wrapped around the cable core or around the power conductors as shown in dashed lines. A thermoplastic jacket 16 is applied over the core. A drain wire 17 may be used. It makes electrical contact with the foil shield and is used for shield termination.
The purpose of the shield 14 i8 to shield the data conductors from electromagneti¢ interference generated by the power conductors and to shield the power conductors from interference generated by the data conductors. The purpose of the overall foil free core wrap film is to maintain the core in its desired profile, prevent overall ~acket adherence and act as a dielectric barrier to the folded ribbon cable. The foil is a conductive type foil, i.e. aluminum or copper.
.. . . .... . .
,. .
~ ., . ;;~. . . :' Referring to Figure 2, there is shown a folded ribbon cable as in Figure 1. However, in this illustration, the ribbon cable is folded with a composite core wrap/shield tape 18 applied about the folded ribbon cable. Thermoplastic jacket and drain wire are provided as in Figure 1.
The purpose of tape 18 is the same as in Figure 1.
In addition, it shields the folded ribbon cable from electromagnetic interference generated by other cables or shields other cables from electromagnetic interference generated by the folded ribbon cable.
Referring to Figure 3, there is shown how a composite foil shield 14 and core wrap tape 15 may be continuously applied in one operation at the same time that the flat ribbon cable 10 i8 being folded.
As illustrated in Figure 3, the flat ribbon cable 10, the flat composite foil shield/core wrap film 14, 15, and the drain wire 17 are payed off feeding equipment 19 into an appropriate folding and ~orming equipment 20 to produce the un-~acketed assembly 21. The un-jacketed assembly is fed to an extrusion equipment 22 to produce the jacketed folded cable assembly shown in Figure 1. The jacketed cable is wound up on takeup equipment 23. This process is an in-line payoff/forming/overall jacket extrusion operation. Appropriate packaging equipment could replace takeup 23. The jacketing process could be a separate step.
. , ,, ~ ~ .
, 2029~17 The equipment shown in Figure 3 could be used for making the folded cable assembly shown in Figure 2 wherein a composite core wrap/shield tape 18 is used instead of a composite foil shield 14/core wrap film lS.
To hold the composite shield and core wrap tape in place, the un-;acketed assembly 21, as per Figure 3, may have a overall helical binder tape. Another method could be adhesive bonding at the core tape overlap 24. Adhesive bonding could take place either at processing or the tape could have a pre-adhesive strip which is activated at processing. No specific method may be required, the tape itself providing the necessary action.
Although the invention has been disclosed with reference to a preferred embodiment, it is to be understood that it is not limited to such embodiment and that other alternatives are also envisaged within the scope of the following claims.
.
: .
.. .~ . ' ,
Claims (7)
1. A process for manufacturing a folded ribbon cable made of two groups of electrically insulated power and data conductors joined between themselves and between the two groups of conductors by flexible webs, comprising:
a) providing a single foil shield or a composite tape made of a foil shield bonded to a plastic film;
b) longitudinally folding a portion of the width of said single foil shield or composite tape around one of said groups of conductors;
c) longitudinally folding the other group of conductors over the one group to form a core while simultaneously wrapping the remaining width of foil shield or composite tape around the core or around the other group of conductors; and d) providing a jacket over the core to form the folded ribbon cable.
a) providing a single foil shield or a composite tape made of a foil shield bonded to a plastic film;
b) longitudinally folding a portion of the width of said single foil shield or composite tape around one of said groups of conductors;
c) longitudinally folding the other group of conductors over the one group to form a core while simultaneously wrapping the remaining width of foil shield or composite tape around the core or around the other group of conductors; and d) providing a jacket over the core to form the folded ribbon cable.
2. A process as defined in claim 1, wherein longitudinal folding of a portion of the foil shield or composite tape around one group of conductors and folding of the other group of conductors over the one group while wrapping the rest of the foil shield or composite tape around the folded ribbon cable is done in a single continuous operation.
3. A process as defined in claim 1, wherein the composite tape is made of a foil shield bonded to the edge of a foil free plastic film.
4. A process as defined in claim 1, wherein the composite tape is made of a foil shield bonded over its full width to a wider foil free plastic film.
5. A process as defined in claim 1, wherein the composite tape is made of a foil shield bonded to a plastic film of the same width.
6. A process as defined in claim 3, 4 or 5 wherein the composite tape is made of two foil shields laminated with a plastic film between them.
7. A process as defined in claim 3,4 or 5, wherein a glass scrim is used between the foil shield and film or laminated between two foil shields.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2029417 CA2029417A1 (en) | 1990-11-07 | 1990-11-07 | Process for shielding a folded ribbon cable made of two groups of power and data conductors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2029417 CA2029417A1 (en) | 1990-11-07 | 1990-11-07 | Process for shielding a folded ribbon cable made of two groups of power and data conductors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2029417A1 true CA2029417A1 (en) | 1992-05-08 |
Family
ID=4146354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2029417 Abandoned CA2029417A1 (en) | 1990-11-07 | 1990-11-07 | Process for shielding a folded ribbon cable made of two groups of power and data conductors |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2029417A1 (en) |
-
1990
- 1990-11-07 CA CA 2029417 patent/CA2029417A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |