KR101775711B1 - Manufacturing method of fire resistant cable - Google Patents

Manufacturing method of fire resistant cable Download PDF

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Publication number
KR101775711B1
KR101775711B1 KR1020150122390A KR20150122390A KR101775711B1 KR 101775711 B1 KR101775711 B1 KR 101775711B1 KR 1020150122390 A KR1020150122390 A KR 1020150122390A KR 20150122390 A KR20150122390 A KR 20150122390A KR 101775711 B1 KR101775711 B1 KR 101775711B1
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South Korea
Prior art keywords
mica
tape
layer
mica tape
forming step
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KR1020150122390A
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Korean (ko)
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KR20170025638A (en
Inventor
최석문
이웅재
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신기전선 (주)
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/14—Insulating conductors or cables by extrusion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0241—Disposition of insulation comprising one or more helical wrapped layers of insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Insulated Conductors (AREA)

Abstract

According to the present invention, a first tape forming step of wrapping an outer surface of a conductor portion in a spiral shape using a first mica tape; A second tape forming step of spirally surrounding the outer surface of the first mica tape using a second mica tape; And forming an insulating layer on the outside of the second mica tape by extrusion molding, wherein the first mica tape comprises a first base layer, a first mica layer coated on the first base layer, And a resin layer coated on the first mica layer, wherein in the first tape forming step, the first mica tape is wound so that the first base layer contacts the conductor portion, and the second mica tape And a second mica layer coated on the second base layer, wherein in the second tape forming step, the second mica tape is wound so that the second mica layer contacts the resin layer And the resin layer is made of a material having a lower melting point than that of the insulating layer and is melted and bonded in the insulating layer forming step.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a refractory cable,

The present invention relates to a method for manufacturing a refractory cable, and more particularly, to a refractory cable having a laminated structure and a manufacturing method thereof improved to maintain a high fire resistance performance through a fire resistance test or a spray test, And a method for manufacturing a refractory cable which can reduce defects in the manufacturing process while reducing the manufacturing cost.

Generally, refractory cable is a cable used for fire protection in case of fire. It is able to supply electric current among the combustion of cable caused by fire, and supplies power to sprinkler, emergency generator, etc., and is useful for internal escape machine and fire suppression even in case of fire. The refractory cable is fabricated with a layer of refractory tape (refractory material) between the conductor and the insulator to withstand flames.

1 is a cross-sectional view showing a general refractory cable having a plurality of insulation core wires. The refractory cable 10 includes at least one insulation core 11 and a protective sheath layer 12 formed outside the insulation core 11 to protect the insulation core 11, (12) is filled with a filler (13) around the insulated core (11). The insulation core 11 is formed of at least one conductor portion 11a made of copper wire or the like, a refractory tape layer 11b spirally covering the conductor portion 11a, And an insulator layer 11c.

The refractory tape layer 11b prevents a short circuit between the conductor portions 11a and disconnection of the conductor portion 11a in the event of a fire. As the refractory tape layer 11b, glass tape or mica tape is used. Korean Registered Utility Model No. 20-0326511 and Korean Registered Patent No. 10-0546929 disclose related technologies. Grass tapes are advantageous in terms of cost reduction, but glass tapes are less used than mica tapes in terms of insulation performance and electrical insulation performance. On the other hand, mica tapes have excellent electrical insulation performance at high temperatures, and are excellent in heat insulation and flame shielding effect. The mica tape is a structure in which a glass fiber substrate is coated with a mica (mica).

However, refractory cables with conventional mica tapes exhibit high fire resistance enough to pass the fire test or spray test required by international standards such as BS8491: 2008, IEC 60331-1: 2009, and IEC 60331-2: 2009 can not do. Accordingly, in order to pass the fire resistance test or the spray test required by the international standard, a method of winding a mica tape of 2 to 3 layers or more, winding a mica tape of 2 to 3 layers or more, and winding the glass tape further was proposed. However, in this case, there is a problem that the consuming amount of the mica tape is large and the manufacturing cost is increased due to the winding process of the additional glass tape, and the fire resistance performance is not so high as compared with the high cost.

Meanwhile, a mica tape is wound around a conductor, an nipple having a different inner hole is sequentially passed through the die, and an insulating layer is formed by covering the outer surface with an insulating material. In this process, a multi- The coating pressure of the insulating material and the traction force of the passing object (the conductor and the main tape) during the passage of the wound conductor cause the boundary surfaces of the respective mica tapes wound on the conductor to be pushed each other, resulting in a change in the overlapping rate of the mica tapes Resulting in manufacturing defective products.

SUMMARY OF THE INVENTION The present invention has been accomplished in order to solve the above-mentioned problems, and it is an object of the present invention to provide a mica tape having a high fire resistance performance through a fire resistance test or a spray test, And a method of manufacturing a refractory cable capable of reducing defects in a manufacturing process while reducing costs.

According to an aspect of the present invention,

A first tape forming step of wrapping the outer surface of the conductor portion in a spiral shape using a first mica tape; A second tape forming step of spirally surrounding the outer surface of the first mica tape using a second mica tape; And forming an insulating layer on the outside of the second mica tape by extrusion molding, wherein the first mica tape comprises a first base layer, a first mica layer coated on the first base layer, And a resin layer coated on the first mica layer, wherein in the first tape forming step, the first mica tape is wound so that the first base layer contacts the conductor portion, and the second mica tape And a second mica layer coated on the second base layer, wherein in the second tape forming step, the second mica tape is wound so that the second mica layer contacts the resin layer And the resin layer is made of a material having a lower melting point than that of the insulating layer and is melted and bonded in the insulating layer forming step.

It is preferable that the overlapping amount of the first mica tape or the second mica tape wound in a spiral shape in the first tape forming step and the second tape forming step is 1/10 to 1/2 of the tape width.

The material of the resin layer may be polyethylene.

According to the present invention, all of the objects of the present invention described above can be achieved. Concretely, it is possible to reduce the consumption amount and manufacturing cost of the mica tape while maintaining the high fire resistance performance which passes through the fire resistance test or the spray test with only two layers of the mica tape, It is possible to reduce the defect rate by preventing the boundary surfaces from being pushed together.

Further, according to the present invention, since the overlapping rate of the mica tape can be reduced, the amount of the mica tape can be reduced, so that the manufacturing cost is reduced and the appearance of the cable is improved at the time of forming the insulating layer.

1 is a cross-sectional view showing a general refractory cable having a plurality of insulation core wires.
2 is a cross-sectional view showing a refractory cable according to an embodiment of the present invention.
FIG. 3 is a detailed sectional view showing a part of FIG. 2 in detail.
FIG. 4 is a view showing the mica tape and the insulating layer separated from each other in the structure of FIG. 3; FIG.
Fig. 5 is a view showing a state in which the first mica tape and the second mica tape of Fig. 2 are wrapped around the conductor. Fig.
6 is a flowchart showing a method of manufacturing a refractory cable according to an embodiment of the present invention.
7 is an explanatory cross-sectional view showing an extrusion forming process of covering a resin insulator on the outside of the second mica tape through the nipple and the die in the insulating layer forming step of Fig.

Hereinafter, the configuration and operation of an embodiment of the present invention will be described in detail with reference to the drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated.

FIG. 2 is a cross-sectional view showing a refractory cable according to an embodiment of the present invention, FIGS. 3 and 4 are detailed sectional views showing part of FIG. 2, Fig. 5 is a view showing a state in which the conductor is wrapped around the conductor. The refractory cable 100 according to the embodiment of the present invention includes a conductor portion 110, a first mica tape 120, a second mica tape 130, and an insulating layer 140 .

The conductor portion 110 is composed of one or more conductors. The conductor is an electrically conductive metal and is made of copper, tin (Sn), silver (Ag), gold (Au), aluminum (Al), nickel (Ni), zinc (Zn), tungsten (Fe) and the like, or an alloy of two or more metals. The conductor may be formed by plating a metal having excellent electrical conductivity with another metal having excellent corrosion resistance and abrasion resistance. For example, the conductor may be composed of a copper wire plated with tin (Sn).

The first mica tape 120 includes a first base layer 121, a first mica layer 122 coated on the first base layer 121, a resin layer 123 coated on the first mica layer 122, ). That is, the first mica tape 120 includes a first base layer 121, a first mica layer 122, and a resin layer 123 stacked in order. The resin layer 123 is made of a resin material having a melting point lower than that of the insulating layer 140. In this embodiment, polyethylene (PE) having a melting point of about 105 to 110 ° C. is used. The first mica tape 120 spirally surrounds the conductor 110 so that the first base layer 121 contacts the conductor 110.

The second mica tape 130 includes a second base layer 131 and a second mica layer 132 coated on the second base layer 131. That is, the second mica tape 130 includes the second base layer 131 and the second mica layer 132 stacked in order. The second mica tape 130 is bonded to the first mica tape 120 such that the second mica layer 132 is in contact with the resin layer 123 of the first mica tape 120 and the second base layer 131 is outward, Spiral. In the manufacturing process (the insulating layer forming step in FIG. 6), the resin layer 123 is melted to bond the first and second mica layers 122 and 132 together. As a result, the first mica tape 120 and the second mica tape 130 are not pressed against each other. Since the resin layer 123 is located between the two mica layers 122 and 132, the first mica layer 122 and the second mica layer 132 are exposed to the resin layer 123 at high temperature and high pressure, So that damage to the mica layers 122 and 132 is reduced. On the other hand, in the conventional refractory cable, since the mica-coated surface is in contact with the conductor portion, the mica is crushed into the corrugation formed on the outer surface of the conductor portion during the fire resistance test.

The first mica tape 120 and the second mica tape 130 may be those conventionally used in the art. The first mica tape 120 and the second mica tape 130 may be prepared by crushing the mica raw mica, An aggregate mica tape manufactured by coating a substrate 121 (131) with a silicone adhesive or the like and drying it is used. The first mica tape 120 and the second mica tape 130 are formed to have a weight ratio of 60 to 70% by weight of mica, 15 to 25% by weight of a base material and 10 to 16% by weight of an adhesive such as epoxy or silicone %. At this time, it is preferable that the mica tape is fired at 750 DEG C or higher to improve the fire resistance performance or the insulation performance of the mica, and the foreign substances contained in the raw light or the organic substances such as the adhesive are burned and removed. The first mica tape 120 is a tape in which a resin layer 123 is additionally formed on the first mica layer 122 using a coater.

The substrate 121 (131) may be selected from a fiber substrate, a polymer film, and the like. Preferably, glass fiber is used as the fiber substrate. The glass fiber may be S- (E-Glass), and the like. However, it is also possible to use tapes such as glass cloth tape and woven glass fabric having a lower grade than the tape type. As a material of the polymer film, a polymer film such as polyethylene, polyamide, and aromatic polyamide film can be used.

The mica constituting the mica layers 122 and 132 is composed of phlogopite (KMg 3 AlSi 3 O 10 (OH, H) 2 ) and muscovite (KAl 2 (AlSi) 4 O 10 (OH, H) 2, etc. It is preferable that the mica uses a soft mica mainly composed of phlogopite. The soft mica is preferably used in terms of performance as an electric insulator, Although it is inferior to a hard mica having a main ingredient of Muscovite, it has a high heat resistance property and has a merit to maintain its molecular structure even at 900 DEG C, so that it can be usefully used as a material for high fire resistance required in the present invention.

The resin layer 123 is applied to the outer surface of the mica layer 122 by a coater. It is preferable that the outer surface of the resin layer 123 is subjected to corona discharge treatment by the discharge processor in the first mica tape 120 to which the resin layer 123 is applied. The resin layer 123 subjected to the corona discharge treatment further enhances the slip prevention effect with respect to the two mica tapes 120 and 130 during the process of forming the insulating layer in the manufacture of the refractory cable, so that the effect of preventing the two mica tapes 120 and 130 from being pushed against each other To reduce the manufacturing defect rate.

As shown in FIG. 5, the first mica tape 120 and the second mica tape 130 are wound to overlap each other by a predetermined amount when wound helically. The overlap amount P is 1/10 of the tape width W To 1/2, but it is preferably set to 1/5 to 1/4 (20% to 25%) of the tape width (W). In order to increase the fire resistance, the overlapping ratio of the conventional fireproof cable is 1/3 to 1/2 of the tape width. However, according to the present invention, since the overlapping ratio can be reduced and the fire resistance performance can be improved, the amount of mica tape can be reduced, And the appearance of the cable becomes good when the insulating layer is formed. On the other hand, the first mica tape 120 and the second mica tape 130 are wound so as to cross each other in a spiral manner.

The insulating layer 140 is formed by extrusion so that an insulating material such as synthetic resin or rubber surrounds the outside of the second mica tape 130 (see FIG. 7). The outer side of the insulating layer 140 may be covered with a coating material through extrusion.

FIG. 6 is a flowchart showing a method of manufacturing a refractory cable according to an embodiment of the present invention. FIG. 7 is a cross- Fig. In this embodiment, a manufacturing method will be described taking a structure in which a covering layer is formed outside the insulating layer 140 of the refractory cable 100 shown in FIG. 2 as an example. The apparatus used in the manufacturing method of the present invention may use an apparatus similar to the apparatus disclosed in Korean Patent No. 10-0546929.

As shown in the drawing, a method of manufacturing a refractory cable includes a core wire forming step S110, a first tape forming step S120, a second tape forming step S130, an insulating layer forming step S140, (S150), and a cable winding step (S160).

The core forming step S110 is a step of forming a conductor 110 having a predetermined diameter and having a predetermined size and forming a conductor 110 having a single core by stranding a plurality of drawn conductors.

The first tape forming step S120 is a step of preparing a first mica tape 120 in which a first mica layer 122 and a first resin layer 123 are sequentially coated on a first base layer 121, The first mica tape 120 is placed on the outer surface of the conductor 110 in such a manner that the base layer 121 contacts the conductor 110 and the resin layer 123 is outside in the longitudinal direction in which the conductor 110 is transferred. It is a step of wrapping in a spiral. The resin layer 123 prevents the first mica layer 122, which is easily broken during the winding of the first mica tape 120, from breaking and blowing to the outside.

In the second tape forming step S130, the second mica tape 130 coated with the second mica layer 132 is prepared on the second base layer 131, and the second mica tape 130, The second mica tape 130 is placed on the first mica tape 120 so that the second mica layer 132 comes in contact with the resin layer 123 of the first mica tape 120 in the longitudinal direction in which the first mica tape 110 is fed, In a spiral manner.

5, in the first tape forming step S120 and the second tape forming step S130, the overlap amount P (P) in which the first mica tape 120 or the second mica tape 130 is helically wound May be 1/10 to 1/2 of the tape width W, but is preferably 1/5 to 1/4 (20% to 25%) of the tape width W. [ In the second tape forming step S130, the second mica tape 130 is wound so as to intersect with the first mica tape 120 in a helical manner.

7, the insulating layer forming step S140 is carried out in the direction of the arrow A while the second mica tape 130 is wrapped, and the insulating layer forming step S140 is performed by sequentially passing through the holes of the nipple N and the die D, As the step of forming the layer 140, the insulating layer 140 is extruded by a predetermined diameter on the outside of the second mica tape 130 by the insulating material sp which is melted and supplied in the direction of arrow B and extruded. The hole of the nipple N has the same outer diameter as that of the second mica tape 130 and the hole of the die D has the same diameter as the outer diameter of the insulating layer 140 to be formed, The resin layer 123 having a melting point lower than that of the insulating material sp melts to form the two mica layers 122 and 132, The boundary surfaces of the double-mica tapes 120 and 130 are not pressed against each other.

In the coating layer forming step S150, the outer covering material is extruded outside the single refractory cable 100 formed with the insulating layer 140, or a plurality of refractory cables 100 having the insulating layer 140 are bundled and bundled And extruding the outer covering material. The space between the refractory cables 100 may be filled with a filler to extrude the outer covering material.

The cable winding step (S160) is a step of winding the coated finished cable to the bobbin.

Table 1 shows an example in which the refractory cable manufactured according to the embodiment of the present invention is compared with a conventional refractory cable. In the comparative test example, the first and second mica tapes 120 and 130 on which the resin layer was not formed were used so that the mica layer of the first mica tape 120 was in contact with the conductor portion 110 and the first mica tape 120 is fabricated so as to be in contact with the mica layer of the second mica tape 130 is an example of the refractory impact test for a conventional fireproof cable.

The fire resistance impact test was carried out in accordance with the international standards of IEC 60331-1 and IEC 60331-2, followed by flame application for 120 minutes and impact for 5 minutes at intervals of 5 minutes.

Test Example
(Implementation and comparison) Cable length and voltage Bending radius of cable Mica tape width
(Overlap Rate) Test result Remarks Example 1 2000 mm,
250V 168mm 1 layer 6mm (not measurable),
2nd floor 6mm (32.3%) No breakage or disconnection of conductors pass Example 2 2000 mm,
1000V 126mm 1 layer 7mm (measurement impossible),
2nd floor 7mm (41.7%) No breakage or disconnection of conductors pass Comparative Example 1 1200 mm,
1000V 84.48mm 1 layer 7mm (0%),
2nd floor 9mm (0%) After 10 minutes of test, conductor breakage and disconnection / crosstalk fail Comparative Example 2 1200 mm,
1000V 66.72 mm The first floor is 7mm (12.4%),
Second floor 8mm (13.3%) 19 minutes after the test, breakage of conductor and breakage / crosstalk fail Comparative Example 3 1200 mm,
1000V 66.72 mm The first floor is 7mm (30.7%),
The second floor 8mm (32.1%) After 10 minutes of test, conductor breakage and disconnection / crosstalk fail Comparative Example 4 1200 mm,
1000V 85.68mm The first floor is 10mm (31%),
Second floor 10mm (32.6%) After 8 minutes of test, conductor breakage and disconnection / crosstalk fail

As shown in Table 1, in the test examples of the present invention, the conductors were not damaged at all during the test period, and they failed the crossing between adjacent conductors or conductors. Thus, in the comparative example, Min and breakage of the conductor portion and disconnection or crosstalk between conductors occurs. The bending radius of the cable is the radius at which it bends during testing according to the diameter and number of conductors of the insulation core.

Although the present invention has been described with reference to the above embodiments, the present invention is not limited thereto. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

100: Refractory cable 110: Conductor part
120: first mica tape 121: first substrate layer
122: first mica layer 123: resin layer
130: second mica tape 131: second substrate layer
132: second mica layer

Claims (3)

A first tape forming step of wrapping the outer surface of the conductor portion in a spiral shape using a first mica tape;
A second tape forming step of spirally surrounding the outer surface of the first mica tape using a second mica tape; And
And forming an insulating layer on the outside of the second mica tape by extrusion molding,
Wherein the first mica tape comprises a first base layer, a first mica layer coated on the first base layer, and a resin layer coated on the first mica layer, wherein in the first tape forming step, The mica tape is wound such that the first base layer contacts the conductor portion,
Wherein the second mica tape comprises a second base layer and a second mica layer coated on the second base layer, and in the second tape formation step, the second mica tape is formed on the second base layer, Respectively,
Wherein the insulating layer is formed in direct contact with the second base layer in the insulating layer forming step,
Wherein the resin layer is made of a material having a melting point lower than that of the insulating layer and is melted and bonded in the insulating layer forming step,
Wherein the material of the resin layer is polyethylene. The method according to claim 1,
Wherein the overlapping amount of the first mica tape or the second mica tape wound in a spiral shape in the first tape forming step and the second tape forming step is 1/10 to 1/2 of the tape width. A method of manufacturing a cable. delete
KR1020150122390A 2015-08-31 2015-08-31 Manufacturing method of fire resistant cable KR101775711B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000207951A (en) * 1999-01-19 2000-07-28 Yazaki Corp Fire resistant electric wire
JP2002260454A (en) * 2001-03-01 2002-09-13 Yazaki Corp Fire proof electric wire

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000207951A (en) * 1999-01-19 2000-07-28 Yazaki Corp Fire resistant electric wire
JP2002260454A (en) * 2001-03-01 2002-09-13 Yazaki Corp Fire proof electric wire

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