JP2001273822A - Electric cable having improved flame retardance and reduced crosstalks and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric cable which is improved in flame retardance characteristic and crosstalk characteristic. SOLUTION: An embodiment of the present invention includes an inclusion (16), an electrical cable (10) with the inclusion, and its manufacturing method. An inclusion (16) is made of a perfluororesin like FEP, and is constituted with a web (24) which is arranged so as to isolated conductive elements in the cable. The thickness (T) of each web is about 10 mils to about 30 mils. The whole width (W) of the inclusion from the tip of one web to the tip of the opposite web is about 120 mils to about 170 mils. The weight per unit length of the inclusion is less than about 6.0 grams per meter (g/m). The inclusion is a foamed, product or is formed with melt fracture. The electric cable (10) with the inclusion is comprised of several conductor pairs (14), an insulating sheath (12) which is formed around the conductor pairs and the inclusion (16) which is arranged to isolate the conductor pairs in the insulating sheath.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an electric cable. In particular, the invention relates to electrical cables having improved flame retardancy and reduced crosstalk.

[0002]

2. Description of the Related Art Local area networks (LANs)
Improvement of the transmission characteristics of telecommunication cables, including cables,
It is an effort goal that already exists in the telecommunications industry. One aspect in improving transmission characteristics is to reduce crosstalk. Conventionally, in an electric cable including a plurality of twisted wire pairs of individually insulated conductors such as copper wires, to reduce crosstalk between conductive pairs by separating parallel and adjacent transmission lines, Many configurations and techniques have been implemented.

For example, maintaining sufficient spacing between conductive pairs,
To reduce crosstalk between conductive pairs by doing so, a flute or crossweb or other suitable spacer element has been included in the electrical cable. U.S. Patent Nos. 4,920,234 and 5,1
See No. 49,915. Since a typical telecommunications industry electrical cable includes four twisted wire pairs, much of the interposition has one or more cross-web sections around which the twisted wire pairs are located, and is centrally located. As a spacer element. For example, US Pat. No. 5,132,
No. 488, No. 5,519,173, No. 5,57
See U.S. Pat. Nos. 4,250 and 5,789,711.

[0004]

Another problem with electrical cables, particularly plenum rated cables and other cables used in various indoor applications, is to maintain sufficient flame retardancy and low smoke characteristics. Telecommunication cables having an insulating material formed from a fluoropolymer,
Typically, these cables must pass a standard flame retardancy test, such as the Underwriters Laboratory Standard 910 test (Steiner Tunnel Test), which authorizes use in plenum spaces in buildings.

Unfortunately, the use of larger and / or thicker interposers or crosswebs to increase the spacing between twisted pairs, thereby improving crosstalk in electrical cables, results in cable flame retardancy. The characteristics often deteriorate. For example, if the spacer element is formed from, for example, fluorinated ethylene propylene resin (FEP) and has an average web thickness greater than about 15 mils (0.381 millimeters), FEP from the spacer element is already present in the copper wire. During the burn test,
Increases the potential pooling of FEP within the insulating sheath of the cable surrounding the conductive element. The insulating sheath is typically formed from poly (vinyl chloride) (PVC) or other suitable material. During the flaming test, the increase in FEP pooling due to the FEP spacer elements is often sufficient to cause tearing of the sheath, which tends to expose more PVC, and often the The result is a rejection at the smoke section.

Accordingly, there is a need for a spacer element for electrical cables that improves crosstalk without degrading the overall flame retardancy and smoke reduction properties of the cable required to pass the fire test conditions. .

[0007]

SUMMARY OF THE INVENTION The invention is defined by the claims. Embodiments of the present invention include intervening electrical cables and fluted electrical cables. The electrical cable interposer is formed from a perfluoro resin, such as fluorinated ethylene propylene resin (FEP) or perfluoroalkoxy polymer (PFA), and comprises a plurality of webs arranged to separate the various conductive element pairs in the intervening electrical cable. It is configured to have. The thickness of an individual web is, for example, about 10 mils (0.254
Millimeters) to about 30 mils (0.762 millimeters), and the total width of the intervention from one web tip to the opposite web tip is, for example, about 120 mils (3.
048 millimeters) to about 170 mils (4.318 millimeters), and the weight per unit length of
For example, less than about 6.0 grams per meter (g / m). According to one embodiment of the invention, the interposition is a foam interposition. According to an alternative embodiment of the invention, the intervention is a melt fracture intervention.

An embodiment of the present invention also includes a plurality of conductor pairs, an insulating sheath formed around the plurality of conductor pairs, and a space between the conductor pairs in the insulating sheath. And an electric cable with an interposition. According to an embodiment of the present invention, the interposer is formed from a perfluoro resin, such as FEP, and is configured with a web arranged to separate the conductive elements in the cable. The thickness of the individual webs is, for example, from about 10 mils to about 30 mils, the total width of the interposition from one web tip to the opposite web tip is, for example, from about 120 mils to about 170 mils; The weight per unit length of the interposition is, for example, less than about 6.0 grams per meter (g / m). The intervention is a foam intervention or a melt fracture intervention.

[0009] Embodiments of the present invention also include a method for making an interposer used, for example, in an intervened electrical cable. In this method, the interposition is, for example, about 10
With a 30 mil web, the total width of the interposition from one web tip to the opposing web tip is from about 120 mils to about 170 mils, and the weight per unit length of the intervention is, for example, about 6 Extruding a perfluoro resin, such as FEP, from an extruder to have a web that is less than 0.0 grams (g / m). The method also includes extruding the interposer such that the interposer is configured to separate the conductive elements in the electrical cable. In one embodiment, the method includes forming a foamed intervention. Alternatively, the method includes extruding the perfluororesin, for example, at an extrusion rate above the critical shear rate of such a material, to form a melt fractured interposition.

According to an embodiment of the present invention, there is provided an electric cable including a plurality of conductor pairs separated by an interposition of the present invention and an insulating sheath formed around the pair of conductors and the interposition of the present invention. It includes the method of doing. The method includes providing a conductor pair, forming an interposition of the present invention between the plurality of conductor pairs, and forming an insulating sheath around the conductor pair and the interposition. Intervening, for example, FEP
Is a foamed intermediate formed by extruding a perfluoro resin such as Alternatively, the method includes extruding the perfluororesin, for example, at an extrusion rate above the critical shear rate of such a material, to form a melt fractured interposition.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS In the following description, like components are referred to by the same reference numerals in order to enhance the understanding of the present invention through the description of the drawings.

[0012] Although specific features, configurations, and arrangements are described below, it should be understood that these are done for illustrative purposes only. One skilled in the art will recognize that other steps, configurations, and arrangements are useful without departing from the spirit and scope of the invention.

[0013] Telecommunication cables typically include a plurality of pairs of conductive elements, such as a twisted pair of copper wires, with the individual wires forming the pair insulated, and a protective insulative sheath surrounding the group of conductive pairs;
Is provided. Many electrical cables also use an intervening or cross-web or other spacer element to provide spacing between pairs of conductive elements within the sheath. In this way, separating parallel and adjacent transmission lines in the electrical cable reduces crosstalk.

For example, electrical cables used as plenum cables and other electrical cables for indoor applications are typically underwriter laboratories, Inc. or Intertek Testing Services.
It has flame-retardant and low-smoke requirements set by accreditation bodies such as For example, a cable that passes the UL-910 test (Steiner Tunnel test) is considered plenum rated. Due to UL-910 fire test requirements, many plenum cables use relatively flame retardant and relatively low smoke materials. For example, such materials are used to individually insulate copper wires or other conductive elements forming twisted wire pairs. Such materials are also used for spacer elements. Such materials include fluoropolymers such as fluorinated ethylene propylene resin (FEP), ethylene chlorotrifluoroethylene (ECTFE), perfluoroalkoxy polymer (PFA), polytetrafluoroethylene (PTFE), and poly (vinyl chloride) (P
VC).

Referring now to FIG. 1, there is shown an electrical cable 10 having the conventional arrangement just described. The electrical cable 10 is formed of a suitable polymeric material and has a sheath 12 surrounding four individually insulated conductor pairs or conductive element pairs 14 separated by intervening or spacer elements 16.
Is provided. A pair of individually insulated conductors is usually
Or a stranded wire pair of copper wires 18 individually insulated with PFA insulator 22. Intervention 16 is FEP, ECTFE, PF
It is formed of a suitable dielectric material such as A, PTFE, or PVC. The insulating sheath is formed, for example, of low smoke polyvinyl chloride (LSPVC), ECTFE, or other suitable material.

To reduce crosstalk in the cable 10, the interposer 16 extends along the length of the electrical cable 10,
It has a plurality of webs or fins 24 arranged to keep the spacing between the conductor pairs 14 substantially constant. Usually 4
If only two of the twisted pairs are active, alternate conductor pairs are often active to reduce crosstalk. In this way, some spacing for crosstalk reduction is inherently provided in certain arrangements of electrical cables.

Conventionally, the interposer 16 has an overall width defined herein for the purposes of this description as the distance from the leading edge of one web to the leading edge of the opposing web.
The overall width of the interposition 16 is generally designated as W. Also, the web has a thickness defined herein for the purposes of this description as the distance from one surface of the web through the web to the opposite surface of the web. The thickness of the web is generally designated as T.

While FEP is advantageous for the purpose of reducing crosstalk and having advantageous fire test characteristics, having too much FEP in cable 10 is disadvantageous. For example, according to embodiments of the present invention, the average web thickness is about 14 mils (ie, 0.015 mils).
Inches or 0.381 millimeters) are typically present during conductive tests during the burn test.
From the pooled FE and the pooled FE
When combined with P, it has an amount of FEP sufficient to cause tearing of the insulating sheath. As mentioned above, a breach of the insulative sheath exposes a greater amount of PVC during the burn test, which may result in a UL910 or NFPA9.
Smoke often fails the 0A combustion test.

Embodiments of the present invention provide for a corresponding increase in the volume or amount of intervening material in an electrical cable (this additional amount contributes disadvantageously and often fails combustion test characteristics), Based on the realization of effectively increasing the size of intervening and other spacer elements to improve crosstalk. Thus, embodiments of the present invention are based on larger, wider and thicker, but generally less dense (more porous) interventions than conventional interventions.

According to an embodiment of the present invention, an intervening or cross-web of foamed perfluororesin is used in an electrical cable, such as cable 10 shown in FIG. Foamed perfluoro resin interposers usually include cells filled with gas through mass and have a lower density than conventional non-foamed interposers. Therefore, according to the embodiment of the present invention,
Thicker but less dense foamed interposers can be used for electrical cables that do not adversely increase the amount of FEP or other perfluoropolymer in the electrical cable. Therefore, due to the increased size of the foamed interposition, without adding additional perfluoro resin to the cable (this
If not, it may contribute to increasing smoke during the burn test), improving the crosstalk interval.

The foamed intervening is formed by a conventional process such as, for example, continuous extrusion or other suitable process. In a conventional continuous extrusion process, a thermoplastic resin or other suitable material is added to an extruder and the resin is continuously melted in the barrel of the extruder through the shear action of one or more extruder screws. Thus, foamed interposition is formed. Prior to adding the resin to the extruder, a chemical nucleating agent, such as boron nitride or other suitable material, is dispersed in particulate form over the particulate resin. Next, an extruder screw uniformly mixes and disperses the nucleating agent into the molten resin. In the middle or mixing section of the extruder, a gas such as nitrogen or carbon dioxide is injected into the molten resin. The molten mixture is extruded through a die and then depressurized to atmospheric pressure, and the gas expands as bubbles (cells) from the nucleating agent in the material body, creating a foamed shape. The size of the cells within the foamed intermediate varies, for example, from relatively large cells having diameters greater than about 10 microns (μm) to microcells having diameters less than about 10 μm.

According to an alternative embodiment of the present invention, a melt-fracture perfluororesin interposer or crossweb is used in an electrical cable, such as cable 10 shown in FIG. More specifically, an alternative embodiment of the present invention comprises an interposer or crossweb formed of a perfluororesin, such as FEP, and includes melt fracture properties on the surface.

Interpositions formed of FEP and / or other polymeric materials are manufactured, for example, by a continuous extrusion process in which the polymeric material is extruded through an extruder die that shapes the polymer as desired, for example, by an extruder screw. You. As the polymer is extruded through the extruder die, the polymer experiences a wide range of shear rates. As long as the extrusion rate remains below the value known as the critical shear rate, the extruded material does not experience the shear rate that causes a phenomenon known as melt fracture.

[0024] Melt fracture is a general term used by the polymer processing industry to describe the broad extrudate irregularities during extrusion of a molten polymer through an extrusion die. As mentioned above, melt fracture occurs when the extrusion rate exceeds the critical shear rate. As long as the extrusion rate remains below the critical shear rate, the surface of the extruded material will generally be
Relatively smooth and shiny. However, at extrusion rates above the critical shear rate, the extruded material
It begins to show a loss of surface gloss (known as surface melt fracture). The loss of gloss is due to fine-scale irregularities in the surface of the extruded material, which can be observed under a microscope at intermediate magnifications (20-40x). The irregularities are due to surface irregularities in the form of closely spaced circumferential ridges along the extruded material surface. In a more severe form, the bumps resemble what is commonly known as "shark skin". In addition, as the extrusion speed further increases, the extruded material exhibits additional irregularities, not limited to the surface (known as gross melt fracture).

In the extrusion process, the extrusion speed is a function of several process parameters, including tool design, such as, for example, line speed, production output, extruder temperature, and extrusion die geometry. Thus, varying one or more of these parameters determines whether the extrusion rate is close to and / or above the critical shear rate of a given extruded material. Thus, the degree of melt fracture of the extruded material is affected by various processing parameters.

In a conventional continuous extrusion process, the melt fracture of the extruded material is undesirable, for example, for aesthetic purposes and for other reasons. Thus, continuous extrusion process parameters conventionally increase or even maximize production (ie, extrusion speed) without sacrificing the smoothness of the extruded material (ie, reducing or minimizing melt fracture). It is set as follows. For example, a number of US patents disclose methods for reducing and / or eliminating melt fracture within a continuous extrusion process. For example, US Pat.
See 2,776, 5,204,032, and 4,321,229.

However, according to an alternative embodiment of the present invention,
The interposer or crossweb used in the electrical cable, for example, cable 10 of FIG. 1, is formed of a perfluororesin, such as FEP or perfluoroalkoxy polymer (PFA), and includes melt fracture properties on its surface. In this way, the bumpy surface of the intervening
It effectively increases the web size of the interposition without actually increasing the size and amount of interposition material used to form the interposition (and thus acts to increase the spacing between conductive elements in the electrical cable). In this way, crosstalk is reduced due to the increased spacing between the conductor pairs. A method for manufacturing such a device according to an embodiment of the present invention includes extruding a perfluororesin interposer at an extrusion rate that exceeds a critical shear rate of the extruded material.

Referring now to FIG. 2, there is shown a cross-sectional photograph of a cross section of a conventional intervention taken at a magnification of about 38 ×. As shown, the conventional intervention is a relatively solid material with a relatively smooth surface. The interposer has a plurality of ribs or crosswebs used to maintain the separation of conductive elements such as twisted wire pairs, as described above. As can be seen from the picture, the surface of the interposition is relatively smooth and shiny. In this way, the finished product is aesthetically pleasing. The overall width of the illustrated interposition is about 150 mils (Δx extending to approximately the leading end of the web is 100.0 mils). Again, width is defined herein as the distance from the leading edge of one web to the leading edge of the opposing web.

The average thickness of the web shown is about 13-14
Mils (Δy is 13.3 mils). As described herein above, thickness is defined as the distance from one surface of the web through the web to the opposite surface of the web. More specifically, for illustrative purposes herein, the measured thickness of the web is about 5
Taken at 0 mil. Such locations are marked by vertical lines in FIG. Thus, the distance Δy in either vertical is about 13.3 mils. The weight per unit length of the illustrated conventional interposition is about 5.07 grams per meter (g / m).

Next, referring to FIG. 3, there is shown a photograph of the foaming intervention according to the embodiment of the present invention. The photographs of the foamed intervening shown in cross section were taken at approximately 38x magnification. As can be seen, the foamed interposer has cells filled with gas through mass, FIG.
, But appear less densely. Also, the surface of the foamed interposition does not look as smooth and glossy as the conventional interposition of FIG. 2, but the irregularities of such a surface are, for example, melt fracture interposition (as shown in FIG. 4 and described below). Explain) is not as noticeable as the bumpy surface.

The foamed intervening according to embodiments of the present invention has a weight per unit length of less than about 6.0 grams per meter (g / m). For example, the foamed interposition of FIG. 3 has a weight per unit length of about 3.6 grams per meter (g / m). This is an advantage compared to 5.07 grams per meter of the conventional intervention shown in FIG. 2 and described above. As described above, foamed interposers made in a continuous extrusion process are made similar to conventional continuous formed interposers, except for the addition of a nucleating agent and related processing.

Although the weight per unit length of the foamed intervention shown in FIG. 3 is less than the conventional intervention shown in FIG. 2, the thickness of the web of the foamed intervention is about 20 mils (Δy is 19.9 mils). ), Which is about 33% thicker than the conventional intervening web thickness of FIG. Generally, foamed intervening according to embodiments of the present invention has an average web thickness of about 10-30 mils. The overall width of the foamed intervening according to embodiments of the present invention is about 140-1.
50 mils, which is about 1 overall width of the conventional intervention of FIG.
Same as compared to 50 mils.

Thus, the foamed interposer of FIG. 3 has a larger (thicker) web than the conventional interposer, and thus has been increased by increasing the spacing between the twisted wire pairs, eg, between adjacent webs. Improve crosstalk of conductive elements. However, as described above, even though the volume of the foamed interposition is greater than the conventional interposition of FIG. 2, the foamed interposition has the same or even less weight per unit length as the conventional interposition. Thus, foamed interposition according to embodiments of the present invention does not introduce additional FEP into the electrical cable.

Referring now to FIG. 4, there is shown a photograph of melt fracture intervention according to an alternative embodiment of the present invention. The photographs of the melt fracture intervention shown in cross section were taken at approximately 38x magnification. It should be understood that the melt fractured interposition shown in FIG. 4 has a similar or lower weight per unit length than the conventional interposition shown in FIG. This is because the process parameters used to fabricate the two interventions were similar except for the process parameters used to increase the extrusion rate above the critical shear rate in the fabrication of the melt fracture intervention of FIG.

Unlike the relatively smooth and shiny surface of the conventional interposition shown in FIG. 2, the melt fracture interposition according to an alternative embodiment of the present invention features a relatively uneven surface along the web.

Because of the uneven surface, the average thickness of the web, at least for the purpose of separating conductive elements in the electrical cable, has effectively increased. For example, in FIG. 4, the effective thickness of the web shown is on average about 20 mils. However, despite the increased spacing due to the melt fracture intervention, its weight per unit length is approximately the same or even less than the conventional intervention shown in FIG.
For example, the total width of the melt fracture intervention shown in FIG.
About 145 mils and the weight per unit volume of the melt fracture inclusions shown in FIG. 4 is about 4.9 per meter
18 grams (g / m). Such attributes are comparable to the conventional intervention of FIG. 2, which has a total width of about 150 mils and a weight per unit volume of about 5.07 grams per meter (g / m).

Referring now to FIG. 5, there is shown a simplified block diagram of a method 30 for making an interposed and interposed cable according to an embodiment of the present invention. The method 30 includes a first step 32 of providing a pair of conductive elements 14, for example, four twisted pairs of copper wires individually insulated with FEP or other suitable polymer.

In the next step 34, the interposition 16 is formed. According to an embodiment of the present invention, the interposition 16 is F
It is formed of EP or other suitable perfluororesin such as PFA. As described above, in accordance with an embodiment of the present invention, step 34 forms a foamed interposer, thereby increasing the width of the interposer 16 and increasing the amount of FEP used to fabricate the interposer 16. Efficiently increase web thickness. Alternatively, the interposition 16 is formed such that a melt fracture of the interposition 16 occurs, thereby effectively increasing the web thickness of the interposition without increasing the amount of FEP at the interposition 16.

In the next step 36, as shown in FIG. 1, for example, the interposition 16 and the conductor pair 14 are configured so that the interposition 16 provides an interval between the conductor pairs. For example, intervention 1
6 are formed, the conductor pairs 14 are generally individually web 2
4 so as to occupy the area of the interposition 16 on one side.
And conductor pair 14 are both unreeled in a conventional manner.

In the next step 38, as shown in FIG. 1, for example, as shown in FIG.
6 is formed around. The insulating sheath 12 is formed, for example, by extruding a suitable polymeric material around the conductor pair 14 and the interposer 16 using, for example, a conventional continuous extrusion process.

Without departing from the spirit and scope of the present invention, which is defined by the appended claims and their full scope of equivalents, the intervening and intervening electrical cables described herein. It will be apparent to those skilled in the art that many modifications and variations can be made to the embodiments of the electrical cable apparatus and methods.

[0042]

According to the present invention, there is provided a cable having improved crosstalk characteristics while maintaining flame retardancy and low smoke characteristics which pass a combustion test.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a conventional electric cable to which an embodiment of the present invention can be applied.

FIG. 2 is a cross-sectional photograph of a conventional intervention taken at about 38 × magnification.

FIG. 3 is a cross-sectional photograph of an intervention according to an embodiment of the present invention, taken at approximately 38 × magnification.

FIG. 4 is a cross-sectional photograph of an intervention according to an alternative embodiment of the present invention, taken at approximately 38 × magnification.

FIG. 5 is a simplified block diagram of a method for making an interposed and interposed cable according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electric cable 12 Insulating armor 14 Conductive element pair 16 Interposition 18 Copper wire 22 Insulator 24 Web

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[Procedure amendment]

[Submission date] March 13, 2001 (2001.3.1.
3)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

Title: Electrical cable with improved flame retardancy and reduced crosstalk and method of making the same

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) B29K 105: 04 H01B 7/34 B (72) Inventor Tommy Glen Hardin United States 30047 Georgia, Lilburn, Emily Drive 422 (72) Inventor John TA. Millsapps United States 30518 Georgia, Buford, Suwanee Dam Road 6275 (72) Inventor Paul Emilien Nevux Jr. United States 30052 Georgia, Loganville, Cloud Brewer Road 3859

Claims (9)

[Claims] 1. A plurality of conductive element pairs (14), an insulating sheath (12) formed around the plurality of conductive element pairs (14), and at least one in the insulating sheath (12). A flute (1) configured to separate at least one other said pair of conductive elements (14) from one said pair of conductive elements (14);
6), wherein the interposition (16) is an electrical cable (10) formed of a perfluoro resin, wherein the interposition (16) has a thickness (10) in a range of about 10 mils to about 30 mils. T) having a plurality of webs (24), the width (W) of the interposition (16) from the tip of the one web (24) to the tip of the opposing web (24).
Is in the range of about 120 mils to about 170 mils, and the interposition (16) is about 6.0 grams per meter (g).
/ M). 2. The cable of claim 1, wherein the interposition (16) further comprises a foamed perfluoro resin or a melt fractured perfluoro resin. 3. The interposition (16) is made of fluorinated ethylene propylene resin (FEP), ethylene chlorotrifluoroethylene (ECTFE), perfluoroalkoxy polymer (PFA), polytetrafluoroethylene (PTE).
FE), and one or more materials selected from the group consisting of poly (vinyl chloride) (PVC).
The cable according to claim 1. 4. The at least one conductive element pair (1)
4) further comprises four conductive element pairs (14) with conductive elements individually insulated, said intervening (16) being generally composed of four conductive element pairs (14) with said conductive elements individually insulated. The cable of claim 1, wherein the conductive elements separate four individually insulated conductive element pairs (14) so as to occupy different quadrants in the electrical cable (10). 5. An interposer (1) for use in a fluted electrical cable comprising a plurality of pairs of conductive elements (14) and an insulating sheath (12) formed therearound.
6) wherein a plurality of the plurality of conductive elements are arranged in the insulating sheath so as to separate at least one other conductive element pair from at least one of the conductive element pairs. Wherein the thickness of the individual webs (24) is in the range of about 10 mils to about 30 mils, wherein the thickness of the opposing webs (24) from the tip of the one web (24) is Width (W) of the interposition (16) up to the tip
Is in the range of about 120 mils to about 170 mils; the interposition (16) is less than about 6.0 grams per meter (g / m); and the interposition (16) is formed of a perfluoro resin. ,
Intervention. 6. The intervention of claim 5, wherein said intervention (16) further comprises a foamed perfluoro resin or a melt fractured perfluoro resin. 7. The interposition (16) is made of fluorinated ethylene propylene resin (FEP), ethylene chlorotrifluoroethylene (ECTFE), perfluoroalkoxy polymer (PFA), polytetrafluoroethylene (PTE).
FE), and one or more materials selected from the group consisting of poly (vinyl chloride) (PVC).
The intervention of claim 5. 8. A method for making an interposer (16) for use in an interstitial electrical cable, the interposer (16) comprising a plurality of webs having a thickness in a range from about 10 mils to about 30 mils. (24), wherein the width of the interposition (16) from the tip of one web (24) to the tip of the opposing web (24) is in the range of about 120 mils to about 170 mils, Extruding the interposition from an extruder such that the weight per unit length of 16) is less than about 6.0 grams per meter (g / m), wherein the interposition (16) is a perfluoro resin. Formed, wherein the interposer (16) is configured to separate conductive element pairs (14) within the electrical cable. 9. The method of claim 8, wherein the step of extruding is performed such that the speed of the extrusion is above the critical shear rate of the intervention (16).