KR20150025720A - strength reinforcement layer for cable and cable including the same - Google Patents

strength reinforcement layer for cable and cable including the same Download PDF

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Publication number
KR20150025720A
KR20150025720A KR20130103693A KR20130103693A KR20150025720A KR 20150025720 A KR20150025720 A KR 20150025720A KR 20130103693 A KR20130103693 A KR 20130103693A KR 20130103693 A KR20130103693 A KR 20130103693A KR 20150025720 A KR20150025720 A KR 20150025720A
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KR
South Korea
Prior art keywords
cable
weft
layer
yarns
warp
Prior art date
Application number
KR20130103693A
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Korean (ko)
Inventor
손순일
양훈철
최아름
Original Assignee
엘에스전선 주식회사
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Application filed by 엘에스전선 주식회사 filed Critical 엘에스전선 주식회사
Priority to KR20130103693A priority Critical patent/KR20150025720A/en
Publication of KR20150025720A publication Critical patent/KR20150025720A/en

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    • 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
    • H01B7/0045—Cable-harnesses
    • 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
    • H01B7/0208—Cables with several layers of insulating material
    • 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
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/182—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring comprising synthetic filaments
    • H01B7/1825—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring comprising synthetic filaments forming part of a high tensile strength core
    • 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
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/1865—Sheaths comprising braided non-metallic layers

Abstract

A strength reinforcing layer for a cable and a cable comprising the same are disclosed. The strength reinforcing layer for a cable and the cable including the same according to the present invention can reduce the weight of the cable and prevent the decrease in flexibility while reinforcing the tensile strength so as to withstand the tensile force generated by the external force during installation or use of the cable, It is possible to prevent the phenomenon that the reinforcement layer is unraveled when acting, and it is possible to prevent the cable breakage due to the excessive tensile force action, and to improve the stability and reliability.

Description

A strength reinforcement layer for a cable and a cable including the reinforcement layer.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strength reinforcing layer for a cable and a cable including the same. More particularly, the present invention relates to a reinforcing layer for a cable, To a strength reinforcing layer for a cable and a cable including the same, which can improve stability and reliability.

Generally, there is a cable which requires a certain level of mechanical tensile strength, while transmitting signals and / or electric power depending on the application or use condition, such as an elevator cable, a crane cable, a tether cable and the like.

Specifically, there is a case where tension is exerted from the outside in the direction of tensile force in the operation of the installation or the product depending on the use in the electric / telecommunication cable product. In the absence of the reinforcing layer for such a tensile force, Etc. may be damaged and the function of the cable may be lost.

Conventionally, a metal wire or a metal braided layer is inserted to reinforce the tensile strength of a cable. When a metal reinforcement is used to reinforce the mechanical properties of the cable, the weight of the cable increases and the flexibility becomes poor. Resulting in inconvenience in use for its original use.

In order to compensate for the disadvantages of such metal reinforcement materials, it is widely known that a reinforcing material having excellent mechanical properties and being light and flexible is applied to a cable.

The cable has various structures depending on the type and application, but generally consists of a conductor-insulated-inner sheath (beding) -external sheath structure, wherein the fiber reinforcing layer is formed of a transverse winding arranged in one direction on the bedding layer, As shown in Fig.

However, when a conventional fiber reinforcing material is transversely wound, when a tensile force is generated in a cable axial direction, a force is generated only in a direction in which the fiber reinforcing material is transversely wound, causing a problem that the fiber is loosened and the cable is twisted in one direction.

In the case of the knitted fabric, there is no problem of fiber loosening / twisting, so it is effective to reinforce twisting of the cable. However, in terms of reinforcing the tensile strength of the cable, the arrangement direction of the fibers is not parallel to the axial direction of the cable, So that the tensile strength of the fibers acts in a direction perpendicular to the axial direction and the axis of the cable. Therefore, it is a structure that can not exert all the tensile strength inherently structurally possessed by the fibers

On the other hand, as described above, tensile stiffeners and braids made of metal have drawbacks such as abrasion resistance and repeated bending strength when applied to places requiring repeated bending strength and abrasion resistance, such as mobile cables used in elevators and cranes, There is a problem of increased weight and reduced flexibility.

Therefore, there is a need for a cable capable of enhancing stability and reliability in use by reinforcing tensile strength and preventing breakage so as to withstand the tensile force generated by external force during installation or use.

Embodiments of the present invention are directed to lowering the weight of a cable and preventing a decrease in flexibility while reinforcing a tensile strength so as to withstand the tensile force generated by an external force during installation or use of the cable.

Also, it is intended to provide a reinforced layer structure capable of preventing the phenomenon that the reinforcing layer is unraveled when the tensile force acts and maximizing the tensile strength.

In addition, it is intended to prevent cable breakage due to excessive tensile force, and to improve stability and reliability.

According to an aspect of the present invention, there is provided an image forming apparatus including: a plurality of warp yarns arranged in parallel to a predetermined distance with respect to a central axis; and a plurality of warp yarns alternately passing between upper and lower faces of the warp yarns, To provide a strength reinforcing layer for a cable comprising a weft that winds along a direction.

The warp and weft yarns may be made of one of polyamide, polyarylate, UHMW-PE (Ultra High Molecular Weight Polyethylene), or a mixture of two or more of them.

The angle between the warp and the weft may be between 40 and 86 degrees.

And, the weight of the weft yarn may occupy 5 to 40% of the total weight including the warp yarn and the weft yarn.

According to another aspect of the present invention, there is provided an antenna comprising: a conductor layer; an insulating layer for insulating the conductor layer; and a strength reinforcing layer formed outside the insulating layer, wherein the strength reinforcing layer comprises a plurality And a weft yarn wound around the circumferential direction of the cable at an angle with the inclination.

The weft yarns may be alternately wound on the upper and lower surfaces of the warp yarns along the circumferential direction.

Here, the strength reinforcing layer may be made of any one of polyamide, polyarylate, and UHMW-PE (Ultra High Molecular Weight Polyethylene), or a mixture of two or more thereof.

The cable according to embodiments of the present invention may further include an inner sheath layer formed outside the insulating layer and an outer sheath layer formed outside the inner sheath layer. The strength reinforcing layer may be formed between the inner sheath layer and the outer sheath layer Lt; / RTI >

The angle between the warp and the weft is 40 to 86 degrees, and the weight of the weft may be constituted to account for 5 to 40% of the total weight of the strength reinforcing layer.

The fibers used as the weft yarns or the warp yarns may be formed by folding one strand or two strands having a fineness of 500 to 2000 Denier.

The embodiments of the present invention can reduce the weight of the cable and prevent the decrease in flexibility while reinforcing the tensile strength so as to withstand the tensile force generated by the external force during the installation or use of the cable.

In addition, it is possible to provide a reinforced layer structure that prevents the phenomenon that the reinforcing layer is unraveled when the tensile force acts and maximizes the tensile strength.

In addition, it is possible to prevent cable breakage due to excessive tensile force action, and to improve stability and reliability.

1 is a cross-sectional view of a cable according to an embodiment of the present invention;
Figure 2 is a cutaway perspective view of a cable in accordance with an embodiment of the present invention.
3 is a view showing a structure of a strength reinforcing layer of a cable according to an embodiment of the present invention
4 is a graph showing a comparison of the tensile strengths of the strength reinforcing layer for a cable and a conventional braiding structure according to an embodiment of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

FIG. 1 is a cross-sectional view of a cable according to an embodiment of the present invention, FIG. 2 is a cutaway perspective view of a cable according to an embodiment of the present invention, and FIG. 3 is a perspective view of a cable according to an embodiment of the present invention. Fig. 4 is a graph comparing the tensile strengths of the strength reinforcing layer for a cable and a conventional braided structure according to an embodiment of the present invention.

1 to 4, a cable 1000 according to an exemplary embodiment of the present invention mainly includes a conductor layer 112, an insulating layer 116 for insulating the conductor layer 112, The strength reinforcing layer 140 includes a plurality of warp yarns 142 disposed parallel to the axial direction of the cable 1000 and a plurality of warp yarns 142 formed at an angle And a weft yarn 144 wound along the circumferential direction of the cable 1000.

The conductor layer 112 may be formed of stranded wires 20 made of any one material selected from among copper, aluminum, aluminum alloy, and copper aluminum wire.

A separator tape 114 may be provided on the outer side of the conductor layer 112 to surround the conductor layer 112. The separator tape 114 is not essential and can be omitted especially when the conductor layer 112 is made of fine wires.

When the separate tape 114 is provided, the insulating layer 116 may be extruded to surround the separate tape 114. The insulating layer 116 is made of a material having an insulating property and an impact resistance property, and covers and protects and insulates the conductive layer 112.

Specifically, the insulating layer 116 may be formed of a material selected from the group consisting of silicone, cross-linked polyethylene (XLPE), crosslinked polyolefin (XLPO), ethylene-propylene rubber (EPR) Polyvinyl chloride (PVC), or a mixture thereof.

The conductor layer 112, the separate tape 114 and the insulating layer 116 form one core 110. The three cores 110, as in the cable 1000 shown in FIGS. 1 and 2, And the number may vary depending on the field to which the cable 1000 is applied, the use environment, the use, and the like.

A filler 122 is filled between the plurality of cores 110 to maintain a circular shape and a binder tape 124 surrounding the plurality of cores 110 and the periphery of the filler 122 may be provided on the outer side thereof. have. The plurality of cores 110, the filler 122, and the binder tape 124 constitute the core portion 120.

The filler 122 functions to prevent circular penetration and gas penetration of the core 120, and is preferably made of a non-hygroscopic material.

The binder tape 124 is mainly made of a PET material but is not limited thereto. The binder tape 124 serves as a core fixing member fixing the shape at the outermost part of the core part 120.

The inner sheath layer 130 may be provided on the outer side of the core 120. The inner sheath layer 130 may be used for the purpose of protecting the inner conductor layer 112 by absorbing an external impact, and may be used for the purpose of flame retardation or the like, but is not essential and may be omitted.

As the inner sheath layer 130, thermoplastic and thermosetting materials such as PVC, HF4-1, SHF1, and chloroprene can be used.

If the inner sheath layer 130 is omitted, the outer side of the core part 120, that is, the outer side of the semi-finished product or the insulating layer 116, is wrapped around the inner sheath layer 130 A strength reinforcing layer 140 may be provided.

The strength reinforcing layer 140 includes a plurality of warp yarns 142 disposed parallel to a central axis and a plurality of warp yarns 142 alternately arranged on the upper and lower surfaces of the warp yarns 142, And a weft yarn 144 wound along the circumferential direction formed by the plurality of warp yarns 142.

The inclination 142 and the weft 144 forming the strength reinforcing layer 140 may be made of any one of Polyamide, Polyarylate or UHMW-PE (Ultra High Molecular Weight Polyethylen) or a mixture of two or more materials , A tensile strength of 2.5 to 4Gpa, and a modulus of elasticity of 70 to 130Gpa.

The warp yarns 142 are arranged in the circumferential direction so as to correspond to the axial direction of the cable 1000 and the longitudinal direction of the fibers, The slopes 142 are arranged to be wound in the circumferential direction of the cable 1000 alternately with the upper surface and the lower surface of each slope 142 while maintaining a certain angle with the axial direction of the cable 1000 so that the slopes 142 are arranged in the circumferential direction of the cable 1000 And to fix the shape to keep it.

At this time, the fibers used as the weft yarns 144 or the warp yarns 142 may be used in the form of one strand or two strands having a fineness of 500 to 2000 Deneri. Where 1Denier is the unit of fineness with 1g when stretched 9000m.

The warp yarns 142 and the weft yarns 144 have an angle of 40 to 86 degrees and the warp yarns 144 are weights of the warp yarns 142 and weft yarns 144, Preferably from 5% to 40%.

As described above, in the case of the conventional braid structure, the direction of all the fibers maintains a certain angle with the axial direction of the cable 1000, so that when the tension acts in the fiber direction, the tension is not concentrated in the axial direction of the cable 1000, Direction.

On the other hand, when the structure of the strength reinforcing layer 140 according to the present invention, that is, the weaving structure composed of the warp yarns 142 and the weft yarns 144 is applied, the fibers used as the warp yarns 142 are parallel to the axial direction of the cable 1000 And only the direction of some of the fibers used as the weft yarns 144 is woven so as to maintain a certain angle with the axial direction so that the warp yarns 142 occupy the most of the total amount of the fibers so that the tensile strength in the axial direction of the cable 1000 is reinforced .

FIG. 4 is a graph comparing the weaving structure of aramid fibers of the same fineness with the weaving structure of the present invention. In the state where the fineness of the aramid fibers is adjusted to 1500 Denier, the braid angle is 30 degrees, 80, and tensile strength changes according to the number of fibers (strands). As shown in the graph of FIG. 4, it can be seen that the circular weaving structure according to the present invention has a larger tensile strength than the braided structure, and that the difference increases as the number of fibers increases.

Meanwhile, it is preferable that the weight ratio of the weft 144 to the total fiber amount of the weft structure of the strength reinforcing layer 140 according to the present invention is maintained at 5 to 40%. If the ratio of the weft 144 is more than 40%, the amount of fiber required to reinforce the same level of tensile strength increases beyond the level of the existing braiding structure.

On the other hand, when the ratio of the weft yarns 144 is less than 5%, the interval between the weft yarns 144 is widened, and the weft yarns 142 can not be tightly woven into the warp yarns 142, There is a problem that it is difficult to perform the sheath extrusion process on the strength reinforcing layer 140.

Item Case 1 Case 2 Case 3


Configuration

Conductor 3C x 1.0SQ 3C x 1.0SQ 3C x 1.0SQ Isolation ETFE ETFE ETFE Inner sheath TPU TPU TPU Strength reinforcement layer Galvanized Steel Wire Braiding Aramid fiber braiding Aramid fiber Outer sheath TPU TPU TPU
Evaluation of reinforced layer Weight (kg / km) 777 37 23 Breaking Strength (N) 30.252 36.720 38.080 flexibility Ha Prize Prize

Table 1 shows the results of evaluating the performance of the cable 1000 according to changes in material and structure in applying the tensile strength reinforcing layer of the cable 1000 to satisfy the same level of breaking strength (tensile strength).

When a braided layer using a generally used metal wire (Gavanized steel wire) is applied to reinforce the mechanical characteristics of the cable 1000, the weight of the cable 1000 is 5 to 6 times that of the product using the fiber reinforced layer It can be seen that the flexibility is greatly reduced due to the large, thick metal layer.

On the other hand, when aramid fiber, which is one of the tensile strength fiber materials, is applied as a reinforcing layer, the weight is decreased and the flexibility quality is excellent compared with the products of the braided reinforcing layer. In addition, even when the same fiber material is applied, it can be confirmed that the product to which the weaving structure of the present invention is applied is lighter than the product to which the braided structure is applied, and the breaking strength is also excellent.


Item Braided structure The present invention One 2 3 4 5 6 7 8 9





Configuration Conductor 3C x 1.0SQ 3C x 1.0SQ 3C x 1.0SQ 3C x 1.0SQ 3C x 1.0SQ 3C x 1.0SQ 3C x 1.0SQ 3C x 1.0SQ 3C x 1.0SQ 3C x 1.0SQ Isolation ETFE ETFE ETFE ETFE ETFE ETFE ETFE ETFE ETFE ETFE Inner sheath TPU TPU TPU TPU TPU TPU TPU TPU TPU TPU Strength reinforcement layer
Vektran Vektran Vektran Vektran Vektran Vektran Vektran Vektran Vektran Vektran Weft 2% Weft 4% Weft 6% Weft 10% Weft 15% Weft 30% Weft 39% Weft 45% Weft 50% Upper angle 35 ° 39 ° 55 ° 73 ° 79 ° 86 ° 86 ° 87 ° 87 ° Outer sheath TPU TPU TPU TPU TPU TPU TPU TPU TPU TPU

Evaluation of reinforced layer Braided appearance Good Appearance defect (fiber-to-fiber gap Appearance defect (fiber-to-fiber gap Good Good Good Good Good Good Good Weight (kg / km) 18 10 10 11 11 12 15 16 18 20 Breaking Strength (N) 20520 22971 23061 22882 22805 22800 22800 22800 22800 22800

Table 2 shows the results of evaluating the performance of the cable according to the weaving structure of the strength reinforcing layer 140 for satisfying the same level of breaking strength (tensile strength). (Knitting: 1500 Denier 24, weaving structure of invention: 1500 Denier, 30 slopes, 2 wefts)

When the weaving structure of the present invention is applied to the braided structure, the amount of fibers required to satisfy the same breaking strength is reduced. In the case of the weft yarn 144 which keeps the warp yarns 142 fixed by weaving them, the effect of weight reduction is small as the required amount is minimized. However, when the ratio of the weft yarns 144 falls below 5%, the warp yarns 142 are tightly It is difficult to maintain the circular shape because it is not arranged, and the surface of the cable 1000 is not uniform in the circumferential direction.

In order to produce the finished product, the sheath extrusion operation is performed on the strength reinforcing layer 140. In order to perform the extruding operation, the die 144 must pass through a die having a predetermined inner diameter. When the ratio of the weft 144 is less than 5% If this is not possible, there is a side effect that interferes with the extrusion due to dies. This is true even when the weft 144 angle? Is less than 40 degrees.

On the other hand, if the ratio of the weft (144) is excessively applied to more than 40%, the appearance of the strength reinforcing layer (140) is excellent, but the weight of the cable increases as compared with the braided structure due to an increase in the ratio of the fibers, there is a problem. This is true even when the weft 144 angle? Exceeds 86 degrees.

The outer sheath layer 150 is provided on the outer side of the strength reinforcing layer 140, that is, at the outermost portion of the cable 1000 to protect the cable 1000 from external impact or corrosion. Like the inner sheath layer 130, the outer sheath layer 150 can be made of thermoplastic or thermosetting materials such as PVC, HF4-1, SHF1, and chloroprene. The outer sheath layer 150 is also not essential and may be omitted.

The cable 1000 according to the embodiments of the present invention described above can reduce the weight of the cable and prevent the decrease in flexibility while reinforcing the tensile strength so as to withstand the tensile force generated by the external force during the installation or use of the cable, It is possible to prevent the phenomenon that the reinforcement layer is unraveled, the cable breakage due to the excessive tensile force action can be prevented, and the stability and reliability can be improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims. You can do it. It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

20: wire 110: core
112: conductor layer 114: separate tape
116 insulating layer 120 core portion
122: Filler 124: Binder tape
130: inner sheath layer 140: strength reinforcing layer
142: warp 144: weft
150: outer sheath layer

Claims (11)

A plurality of slopes disposed parallel to a predetermined distance with respect to a central axis; And
And a weft that alternately passes between the upper and lower surfaces of the warp yarns and is wound along a circumferential direction forming a plurality of warp yarns forming an angle with the plurality of warp yarns. The method according to claim 1,
Wherein the warp and weft yarns are made of one of Polyamide, Polyarylate or Ultra High Molecular Weight Polyethylen (UHMW-PE), or a mixture of two or more thereof. The method according to claim 1,
Wherein an angle between the warp and the weft is 40 to 86 degrees. The method according to claim 1,
Wherein the weight of the weft yarns comprises 5 to 40% of the total weight including the warp yarns and weft yarns. Conductor layer;
An insulating layer for insulating the conductor layer; And
And a strength reinforcing layer formed outside the insulating layer,
Wherein the strength reinforcing layer comprises a plurality of warp yarns arranged parallel to the axial direction of the cable and a weft yarn winding at a constant angle with the warp yarns along the circumferential direction of the cable. 6. The method of claim 5,
Wherein the weft yarns are wound along the circumferential direction while alternating between the upper and lower surfaces of the warp yarns. 6. The method of claim 5,
Wherein the strength reinforcing layer is made of one of Polyamide, Polyarylate, UHMW-PE (Ultra High Molecular Weight Polyethylene), or a mixture of two or more thereof. 6. The method of claim 5,
An inner sheath layer formed outside the insulating layer and an outer sheath layer formed outside the inner sheath layer, wherein the strength reinforcing layer is positioned between the inner sheath layer and the outer sheath layer. 6. The method of claim 5,
Wherein an angle between the warp and the weft is 40 to 86 degrees. 6. The method of claim 5,
Wherein the weight of the weft comprises 5 to 40% of the total weight of the strength reinforcing layer. 6. The method of claim 5,
Wherein the fibers used as the weft yarns or the warp yarns are composed of one yarn or two yarns or more stranded with a fineness of 500 to 2000 Denier.
KR20130103693A 2013-08-30 2013-08-30 strength reinforcement layer for cable and cable including the same KR20150025720A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190062105A (en) * 2017-11-28 2019-06-05 히타치 긴조쿠 가부시키가이샤 Cable provided with braided shield
CN110400656A (en) * 2019-02-22 2019-11-01 淮南文峰航天电缆有限公司 A kind of cloud floating mooring photoelectric comprehensive transmission cable
CN116884687A (en) * 2023-08-03 2023-10-13 河南华东电缆股份有限公司 High tensile strength's fire-retardant fire-resistant cable

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190062105A (en) * 2017-11-28 2019-06-05 히타치 긴조쿠 가부시키가이샤 Cable provided with braided shield
CN110400656A (en) * 2019-02-22 2019-11-01 淮南文峰航天电缆有限公司 A kind of cloud floating mooring photoelectric comprehensive transmission cable
CN116884687A (en) * 2023-08-03 2023-10-13 河南华东电缆股份有限公司 High tensile strength's fire-retardant fire-resistant cable
CN116884687B (en) * 2023-08-03 2024-01-30 河南华东电缆股份有限公司 High tensile strength's fire-retardant fire-resistant cable

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