CN114999742B

CN114999742B - Production method of fireproof data communication cable

Info

Publication number: CN114999742B
Application number: CN202210599613.6A
Authority: CN
Inventors: 沈敏强; 任彦峰; 谢钟铮; 秦瑞攀; 钱甜甜; 徐小军; 楼余超
Original assignee: Zhejiang Tianjie Industrial Corp
Current assignee: Zhejiang Tianjie Industrial Corp
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2022-12-20
Anticipated expiration: 2042-05-30
Also published as: CN114999742A

Abstract

The invention relates to a production method of a fireproof data communication cable, belonging to the technical field of cables and comprising the following steps: selecting a bare conductor; coating an insulating layer outside the bare conductor; coating a mica tape outside the insulating layer; coating a ceramic polyolefin material outside the mica tape, and then coloring and distinguishing to form a core wire; twisting the core wires into a plurality of groups of core wires; coating a shielding layer outside the multiple groups of core wires; and a flame retardant layer is coated outside the shielding layer. According to the invention, through the insulation structure of the continuous drawing and continuous annealing bare copper conductor and the skin-bubble skin, the capacitance value of insulated water is controlled, the uniformity of the insulation foaming degree is ensured, and the electrical performance is excellent and stable; a layer of synthetic mica tape is wrapped, so that the mica tape is ensured to form a whole body during combustion, flame is isolated, and the conductor is prevented from being burnt.

Description

Production method of fireproof data communication cable

Technical Field

The invention relates to the technical field of cables, in particular to a production method of a fireproof data communication cable.

Background

Ordinary data communication cable, structurally use HDPE as insulating basically, regard as the sheath with PVC, it is relatively poor not to have fire prevention effect or fire prevention effect, will paralysis in the very short time by the communication line that this cable was born when taking place the conflagration, unable normal work.

The fireproof cable is generally designed by adopting mineral insulation or metal armor, is relatively hard, is only suitable for being fixedly laid and used, is difficult to bend or move in small equipment or narrow space for use, and is not suitable for the use environment of a security control line.

Disclosure of Invention

The present invention is directed to a method for producing a fireproof data communication cable, which solves the above-mentioned problems of the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

a method of producing a fire-resistant data communications cable, comprising the steps of:

selecting a bare conductor;

coating an insulating layer outside the bare conductor;

coating a mica tape outside the insulating layer;

coating a ceramic polyolefin material outside the mica tape, and then coloring and distinguishing to form a core wire;

twisting the core wires into a plurality of groups of core wires;

coating a shielding layer outside the multiple groups of core wires;

and the outer part of the shielding layer is coated with a flame-retardant layer.

As a further technical scheme of the invention, the bare conductor is made of copper.

As a further technical scheme of the invention, the insulating layer is of a skin-bubble skin structure.

In a still further aspect of the present invention, the mica tape has a thickness of 0.1mm, is spirally wound, and has an overlapping ratio of more than 45% at the time of winding.

As a further technical scheme of the invention, the thickness of the ceramic polyolefin material is 0.1mm, and the ceramic polyolefin material is coated by extrusion.

As a still further aspect of the present invention, the shielding layer includes:

the aluminum foils are respectively wound on the surfaces of the multiple groups of core wires in a spiral shape;

and a braid layer which weaves the plurality of groups of core wires inside.

As a further technical scheme of the invention, the braid layer is braided by tinned copper wires, and the braiding density is more than 80%.

As a still further aspect of the present invention, the flame retardant layer includes:

and the halogen-free sheath is sleeved outside the woven layer.

As a further technical scheme of the invention, the weaving layer is internally provided with a ground wire which is made of tin-plated copper.

Compared with the prior art, the invention has the beneficial effects that:

1. the root continuous drawing continuous annealing bare copper conductor and the insulating structure of the skin bubble skin control the capacitance value of insulated water, ensure the uniformity of the insulating foaming degree and have excellent and stable electrical performance.

2. And a layer of synthetic mica tape is wrapped, the thickness of the synthetic mica tape is controlled to be 0.1mm, the temperature resistance can reach 1000 ℃, the overlapping rate reaches 45 percent, the mica tape is ensured to form a whole during combustion, flame is isolated, and conductors are prevented from being burnt.

3. A layer of 0.1mm ceramic polyolefin material is extruded, so that not only can colors be distinguished and the mica tapes can be processed and used in the next procedure, but also the internal mica tapes can be protected from being damaged in the processing of the next procedure, thereby reducing the fireproof performance and strengthening the fireproof performance.

4. The optimized pitch is adopted for twisting, signal loops are formed, and each pair is independently shielded by aluminum foil, so that the electrical performance is more stable; the metallic aluminum face is outwards, so that the shields are conducted and connected into a whole, the shields are more reliable, and meanwhile, the metallic aluminum face and the outer woven layer form a heat conduction shield body, and heat is dissipated more quickly during combustion.

5. Tinned copper grounding wire and more than 80% tinned copper weaving layer not only promote the cable interference killing feature to improve the whole tensile strength of cable greatly.

6. The semi-extrusion type extrusion coating is a high-flame-retardant low-smoke halogen-free sheath, and the sheath with good carbon crust formation protects the internal structure of the cable from being damaged during combustion.

Drawings

Fig. 1 is a cross-sectional view of a fire-resistant data communication cable prepared in example 3.

In the figure: 1-bare conductor, 2-insulating layer, 3-mica tape, 4-ceramic polyolefin material, 5-aluminum foil, 6-ground wire, 7-tinned copper wire and 8-halogen-free sheath.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Example 1

selecting a bare conductor 1: 1/0.65 +/-0.005 mm of bare copper wire is taken as a bare conductor 1;

coating a 1.35 +/-0.10 mm skin-bubble skin insulating layer 2 outside the bare conductor 1;

6-0.10mm mica tape 3 wrapping is coated outside the insulating layer 2, and the overlapping rate is controlled to be 45%;

coating a 0.1mm ceramic polyolefin material 4 outside the mica tape 3, and then distinguishing the mica tape by respectively marking white, blue, orange, green and brown to form a core wire;

twisting the core wires into four types of white/blue, white/orange, white/green and white/brown;

wrapping aluminum foils 5 outside the twisted four core wires respectively for shielding, and enabling the aluminum surfaces to face outwards; then, a braided layer is braided by using 80% tinned copper wires 7 to coat four core wires wrapped with aluminum foils 5 inside, and the braiding angle is as follows: 40 degrees;

the halogen-free sheath 8 is coated outside the shielding layer, preferably, the halogen-free sheath 8 is a red flame-retardant low-smoke material with the thickness of 10.5 +/-0.30 mm, and the semi-extrusion wrapping is round.

Example 2

6-0.10 mm mica tape 3 wrapping the insulating layer 2, and the overlapping rate is controlled to be 50%;

wrapping aluminum foils 5 outside the twisted four core wires respectively for shielding, and enabling the aluminum surfaces to face outwards; then, a braided layer is braided by using 85% tinned copper wires 7 to coat four core wires wrapped with aluminum foils 5 inside, and the braiding angle is as follows: 50 degrees;

Example 3

wrapping aluminum foils 5 outside the twisted four core wires respectively for shielding, and enabling the aluminum surfaces to face outwards; then, a braided layer is braided by using 80% tinned copper wires 7 to coat four core wires wrapped with aluminum foils 5 inside, and the braiding angle is as follows: 45 degrees;

tin-plated copper is arranged in the woven layer to be used as a ground wire 6;

and a halogen-free sheath 8 is coated outside the shielding layer, preferably, the halogen-free sheath 8 is a red flame-retardant low-smoke material with the thickness of 10.5 +/-0.30 mm, and the semi-extrusion coating is round.

The fireproof data communication cable prepared in example 3 was subjected to multiple sets of performance tests, and the specific test items were as follows:

1. loop resistance: less than or equal to 110 omega/km;

2. characteristic impedance: 100 +/-15 omega;

3. nominal value of capacitance: 60pF/m;

4. the flame-retardant requirement is as follows: tested by IEC60332-1-2&IEC 60332-3-24;

5. integrity testing of the line in a flame: the test is carried out by BS6387 CWZ & EN 50200 (IEC 60331) 3H.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A method of producing a fire-resistant data communication cable, comprising the steps of:

selecting a bare conductor;

coating an insulating layer outside the bare conductor;

coating a mica tape outside the insulating layer;

twisting the core wires into a plurality of groups of core wires;

coating a shielding layer outside the multiple groups of core wires;

the flame retardant layer is coated outside the shielding layer;

the bare conductor is made of copper;

the insulating layer is of a skin-bubble skin structure;

the mica tape is 0.1mm in thickness, is spirally wound, has an overlapping rate of not less than 45 percent and is 0.1mm in thickness, and is coated by extrusion;

the shielding layer includes:

a braid layer in which a plurality of sets of core wires are braided;

the braided layer is formed by braiding tinned copper wires, and the braiding density is more than 80%;

the flame retardant layer includes:

the halogen-free sheath is sleeved outside the woven layer;

the ground wire is arranged in the woven layer and is made of tin-plated copper.