High-flame-retardant shielding category 5-enhanced digital communication cable

Abstract

The utility model discloses a high-flame-retardant shielding category 5-enhanced digital communication cable, which enables the flame-retardant performance of the cable to be improved and meets the flame-retardant grade requirement of a cable for a subway. The cable comprises four groups of wire pairs, and each group of wire pair is formed by twisting two different single core wires; a polyester tape; an aluminum-mica tape; the outer sheath is a halogen-free low-smoke flame-retardant polyolefin sheath; a drain wire; and a rip cord; the four groups of wire pairs are twisted to form a central area, the polyester tape is wrapped on the periphery of the central area, the aluminum-mica tape is wrapped on the periphery of the polyester tape, the drainage wire is longitudinally arranged on the periphery of the polyester tape, the tearing rope is longitudinally arranged on the periphery of the aluminum-mica tape, and the outer diameter of the tearing rope is smaller than that of the polyester tape. And the outer sheath is compounded on the periphery of the aluminum-mica tape.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of cable structure, specifically is a kind of high flame-retardant shielded ultra 5 digital communication cable. BACKGROUND

[0002] The ultra 5 digital communication cable with shielding performance is based on the ultra 5 digital communication cable, and a metal shielding layer is added to the outer periphery, which can effectively prevent electromagnetic interference and radiation, provide faster network speed and more stable signal transmission. It is suitable for application scenarios with high electromagnetic compatibility requirements.

[0003] Such communication cable has been widely used in home or building wiring, but corresponding to mature track laying, since the cable for urban rail needs to meet higher fire and flame retardant requirements, the existing shielded ultra 5 digital communication cable cannot meet the combustion performance requirements of the cable for urban rail. Therefore, there is an urgent need to develop a corresponding cable that meets the B1 level combustion performance requirement. UTILITY MODEL CONTENT

[0004] To solve the above problems, the utility model provides a kind of high flame-retardant shielded ultra 5 digital communication cable, which improves the flame-retardant performance of the cable and meets the flame-retardant grade requirements of the cable for subway.

[0005] A kind of high flame-retardant shielded ultra 5 digital communication cable, characterized in that it comprises:

[0006] Four groups of wire pairs, each group of wire pairs includes two different single-core wires twisted together;

[0007] Polyester tape;

[0008] Aluminum-mica tape;

[0009] Outer sheath, which is a halogen-free low-smoke flame-retardant polyolefin sheath;

[0010] Drain wire;

[0011] And tear rope;

[0012] The four groups of wire pairs are twisted to form a central region, the outer periphery of the central region is wrapped with the polyester tape, the outer periphery of the polyester tape is wrapped with the aluminum-mica tape, one drain wire is longitudinally arranged on the outer periphery of the polyester tape, one tear rope is longitudinally arranged on the outer periphery of the aluminum-mica tape, and the outer periphery of the aluminum-mica tape is compounded with the outer sheath.

[0013] Further characterized in that:

[0014] The single-core wires of each group of wire pairs are formed by combining copper conductors and polytetrafluoroethylene FEP insulating layers;

[0015] The drain wire is located between the polyester tape and the foil layer of the aluminum-mica layer;

[0016] The aluminum-mica tape comprises an inner aluminum foil, a mica tape and an outer aluminum foil, the aluminum-mica tape is integrally formed by bonding the mica tape through the inner aluminum foil and the outer aluminum foil, the thickness of the inner aluminum foil and the outer aluminum foil is 0.012-0.02mm, the mica tape is made of mica ore powder and a fire-retardant adhesive, and the thickness of the mica tape is 0.012-0.02mm;

[0017] The outer surface of the single-core wire is uniformly covered by the polyfluoroethylene propylene FEP plastic, and eight colors of blue, white blue, orange, white orange, green, white green, brown and white brown are formed respectively; and the two insulated single-core wires are twisted into a blue and white blue wire pair, an orange and white orange wire pair, a green and white green wire pair and a brown and white brown wire pair at different pitches.

[0018] The oxygen index of the halogen-free low-smoke flame-retardant polyolefin sheath is 65.

[0019] After the structure of the utility model is adopted, four groups of wire pairs are twisted to form a central region, the outer periphery of the central region is wrapped with a polyester tape, and then an aluminum-mica tape is wrapped, the aluminum-mica tape has good metal shielding effect and can also insulate external combustion heat, has excellent flame-retardant and fire-resistant effect, and the shielding super 5-class digital communication cable formed by the combination of the halogen-free low-smoke flame-retardant polyolefin sheath as an outer sheath meets the flame-retardant grade requirement of the cable for the subway. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a sectional view of a specific embodiment of the utility model;

[0021] The names corresponding to the serial numbers in the drawing are as follows:

[0022] Polyester tape 1, aluminum-mica tape 2, outer sheath 3, drain wire 4, tear rope 5, single-core wire 6, copper conductor 7, polyfluoroethylene propylene FEP insulation layer 8 and wire pair 10. DETAILED DESCRIPTION

[0023] A high-flame-retardant shielding super 5-class digital communication cable is shown in Figure 1 : four groups of wire pairs 10, polyester tape 1, aluminum-mica tape 2, outer sheath 3, drain wire 4 and tear rope 5;

[0024] Each group of wire pairs 10 is twisted by two different single-core wires 6, the colors of the four groups of wire pairs 10 are different, and the single-core wires 6 of each group of wire pairs 10 are formed by the combination of a copper conductor 7 and a polyfluoroethylene propylene FEP insulation layer 8;

[0025] The outer sheath 3 is a halogen-free low-smoke flame-retardant polyolefin sheath.

[0026] Four groups of wire pairs 10 are twisted to form a central region, the outer periphery of the central region is wrapped with a polyester tape 1, an aluminum-mica tape 2 is wrapped on the outer periphery of the polyester tape 1, one drain wire 4 is longitudinally arranged on the outer periphery of the polyester tape 1, one tear rope 5 is longitudinally arranged on the outer periphery of the aluminum-mica tape 2, and an outer sheath 3 is compounded on the outer periphery of the aluminum-mica tape 2.

[0027] In the embodiment, the outer surface of the copper conductor 7 is uniformly coated with polyfluoroethylene propylene FEP plastic to form eight kinds of colors of blue, white blue, orange, white orange, green, white green, brown, and white brown respectively; and two insulated single-core wires 6 are twisted into blue and white blue wire pairs, orange and white orange wire pairs, green and white green wire pairs, and brown and white brown wire pairs respectively at different pitches.

[0028] The four groups of wire pairs 10 are twisted to form wire pairs at different pitches, and the pitch is 10-20 mm.

[0029] The outer arc surface of the drain wire 4 is attached to the inner aluminum foil of the aluminum-mica layer 2.

[0030] The aluminum-mica tape 2 comprises an inner aluminum foil, a mica tape, and an outer aluminum foil, and the aluminum-mica tape is integrally formed by bonding the mica tape through the inner aluminum foil and the outer aluminum foil, and the thickness of the inner aluminum foil and the outer aluminum foil is 0.012-0.02 mm; the mica tape is made of mica ore powder and a fire-retardant adhesive, and the thickness of the mica tape is 0.012-0.02 mm.

[0031] The halogen-free low-smoke flame-retardant polyolefin sheath as the outer sheath 3 has an oxygen index of 65 and meets the performance in the following table, has good flame-retardant effect, and has very excellent mechanical physical properties.

[0032] Item Index Density 1.57 ± 0.02 g / cm 3 ]] Tensile strength 12 MPa Tensile strength after aging 10 MPa Elongation at break 180％ Change rate of elongation at break after aging (maximum value) ±15％ Volume resistivity ≥ 1.0 x 10 10 Ω·m Environmental stress cracking resistance 96 h Failure number 0 / 10 Heat distortion rate 90°C, 1 Kg ≤20％ Limiting oxygen index 65±1％ Combustion gas PH value ≥4.3 Combustion gas conductivity ≤ 10 μS / mm Hydrogen halide gas content ≤ 5 mg / g Hardness 50 ± 2 Shore D Low temperature embrittlement temperature -25(0 / 10)

[0033] The wire pairs of different colors form four groups of wire pairs, the four groups of wire pairs are twisted and combined to form a central region, then wrapped with a polyester tape, and then wrapped with an aluminum-mica tape, the aluminum-mica tape has good metal shielding effect and can also isolate the external burning heat, has very excellent flame-retardant and fire-resistant effect, and the shielding super 5-class digital communication cable formed by the combination of the halogen-free low-smoke flame-retardant polyolefin sheath as the outer sheath has high flame-retardant property, and meets the flame-retardant grade requirements of the cable for the subway.

[0034] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0035] Furthermore, it should be understood that although the present specification is described in terms of embodiments, not every embodiment according to the present specification needs to exhibit each and every characteristic specified in the present specification. The specification can also be described in terms of a single independent technical solution, but this does not mean that each embodiment only contains one independent technical solution. The specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A high flame retardant shielded Category 5e digital communications cable characterized in that, It comprises: Four groups of wire pairs, each group of wire pairs comprising two different single-core wires twisted together; A polyester tape; An aluminum-mica tape; An outer sheath which is a halogen-free low-smoke flame-retardant polyolefin sheath; A drain wire; and A tear rope; The four groups of wire pairs are twisted to form a central region, the outer periphery of the central region is wrapped with the polyester tape, the aluminum-mica tape is wrapped on the outer periphery of the polyester tape, one drain wire is longitudinally arranged on the outer periphery of the polyester tape, one tear rope is longitudinally arranged on the outer periphery of the aluminum-mica tape, and the outer periphery of the aluminum-mica tape is compounded with the outer sheath.

2. A high flame retardant shielded Category 5e digital communications cable according to Claim 1 wherein: The single-core wires of each group of wire pairs are combined by a copper conductor and a polytetrafluoroethylene (FEP) insulation layer.

3. A high flame retardant shielded Category 5e digital communications cable according to Claim 1 wherein: The drain wire is located between the polyester tape and the foil layer of the aluminum-mica layer.

4. A high flame retardant shielded Category 5e digital communications cable according to Claim 1 wherein: The aluminum-mica tape comprises an inner aluminum foil, an outer mica tape, and an outer aluminum foil, and is integrally formed by bonding the mica tape through the inner aluminum foil and the outer aluminum foil, the thickness of the inner aluminum foil and the outer aluminum foil is 0.012-0.02mm; the mica tape is made of mica ore powder and a flame-retardant adhesive, and the thickness of the mica tape is 0.012-0.02mm.

5. A high flame retardant shielded Category 5e digital communications cable according to Claim 2, characterized in that: The polytetrafluoroethylene (FEP) plastic uniformly covers the outer surface of the single-core wires, and is made into eight colors of blue, white blue, orange, white orange, green, white green, brown, and white brown, respectively; then two insulated single-core wires are twisted into blue and white blue wire pairs, orange and white orange wire pairs, green and white green wire pairs, and brown and white brown wire pairs at different pitches.

6. A high flame retardant shielded Category 5e digital communications cable according to Claim 1 wherein: The oxygen index of the halogen-free low-smoke flame-retardant polyolefin sheath is 65.

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