KR20150074557A - CMP grade UTP cable - Google Patents

Abstract

The present invention relates to a plenum grade unshielded twisted pair (UTP) cable. The present invention relates to an UTP cable which has high flame resistance of a communication plenum (CMP) grade, reduces manufacturing costs without increasing thickness or volume, and is made of an eco-friendly material.

Description

CMP Flame Retardant UTP Cable {CMP grade UTP cable}

The present invention relates to a UTP cable with a plenum grade UTP (Unshielded Twisted Pair) cable, which has a CMP (Communication Plenum) grade high flame retardancy and is not increased in thickness and volume, will be.

A UTP (Unshielded Twisted Pair) cable is a type of signal line that connects the environment of a normal telephone line or a LAN. The UTP cable is used to enclose a plurality of pairs of two insulated copper wires, It is a name given in the meaning of line.

1 schematically shows a cross-sectional structure of a 4-pair UTP cable in which four pairs of units are wrapped with an outer jacket.

As shown in FIG. 1, the four-pair UTP cable has a structure in which four pair units 100 are surrounded by one outer jacket 300. Each of the pair units 100 is formed by twisting conductive wires 111, preferably two conductive wires 110 insulated and coated with an insulator 112 at constant pitches with each other .

Conventionally, the 4-pair UTP cable has a structure in which the insulator 112 is made of a fluororesin such as a polytetrafluoroethylene (PTFE) resin, a fluorinated ethylene propylene (FEP) resin, a flame retardant polyethylene Flame retardant polyolefin such as fire-resistant Polyethylene (FRPE) and fire-resistant polypropylene (FRPP).

However, the fluororesin is excellent in flame retardancy and electrical properties, but has a high price, raises the unit price of the cable, has a high viscosity upon melting, and has a poor processability, such as difficulty in melt molding. In particular, by discharging harmful gas such as fluorine gas, There is a problem that is not environmentally friendly.

Therefore, a technique of replacing the insulator 112 constituting a part of the pair unit 100 of a plurality of the pair units 100 with a double insulation of a flame-retardant polyolefin material or an inner flame retardant polyolefin and an outer fluororesin has been developed.

However, since flame retardant polyolefin is a mixture of flame retardant and additive in polyolefin resin, the dielectric constant and dielectric loss are increased, and the electrical characteristics are largely lowered. In order to overcome this problem, the thickness and volume of the insulator are greatly increased As a result, the flame retardancy of the cable is deteriorated.

When the flame retardant polyolefin is applied, it may be considered to apply the outer jacket 300 to the polyvinylchloride (PVC) material in order to minimize the decrease in the flame retardancy. However, .

Therefore, a flame retardant UTP cable, which is not environmentally friendly, has high flame retardancy of CMP (Communication Plenum) grade and does not increase the thickness and volume of the cable, is required without using expensive fluororesin.

It is an object of the present invention to provide a UTP cable having CMP (Communication Plenum) grade flame retardancy.

It is another object of the present invention to provide a UTP cable that is environmentally friendly and has a reduced manufacturing cost.

Further, the present invention aims to provide a UTP cable in which the thickness and volume of the insulator are not increased, while the flame retardancy and the electrical characteristics are simultaneously achieved, so that the thickness and volume of the cable as a whole are not increased.

In order to solve the above problems,

A plurality of pari units formed by twisting a plurality of conductive wires including a conductor and an insulator surrounding the conductor, and an outer jacket surrounding the plurality of pair units; Wherein the plurality of pairs of units comprises at least one first pair unit formed by twisting a plurality of wires each including an insulator formed from a flame retardant polyolefin resin composition and a plurality of conductors including an insulator formed from the non-soft polyolefin resin composition The present invention provides a CMP flame retardant UTP cable, comprising at least one second pair unit formed as a load.

Here, the flame-retardant polyolefin resin composition has a dielectric constant of 2.9 or less, a limited oxygen index (LOI) of 30% or more, a smoke density measured according to ASTM E662 of 500 or less and a melt flow rate (2.16 kg, Of the flame retardant UTP cable is 5 g / 10 min or more.

The outer jacket may further comprise a resin composition comprising a flame retardant polyvinyl chloride resin having a limiting oxygen index (LOI) of 45 to 60% and 5 to 10 parts by weight of a metal hydroxide flame retardant based on 100 parts by weight of the flame retardant polyvinyl chloride resin Lt; RTI ID = 0.0 > flame retardant < / RTI > UTP cable.

Here, it is preferable that the second pair unit is one, the twist pitch of the second pair unit is shorter than the twist pitch of each of the plurality of first pair units, and the twist pitch of the conductor among the plurality of first pair units is the shortest Wherein the one pair unit is disposed at a diagonal line which is most distant from the second pair unit, and a CMP flame retardant rated UTP cable.

It is preferable that the twist pitch of each of the second pair units is shorter than the twist pitch of each of the plurality of first pair units, and the two second pair units have diagonal lines CMP flame retardant rated flame retardant UTP cable.

The first pair unit has a twist pitch of 0.6 to 1.2 inches, and the second pair unit has a twist pitch of 0.3 to 0.53 inches. The CTP flame retardant rated UTP cable is provided.

Further, the present invention provides a CMP flame retardant rated flame retardant UTP cable, wherein the difference in transmission speed between the first pair unit and the second pair unit is 45 ns or less.

On the other hand, the CMP flame retardant rated flame retardant UTP cable is characterized in that the volume of the insulator forming the second pair unit is 85 to 95% of the volume of the insulator forming the first pair unit.

The flame retardant polyolefin resin composition may further comprise a base resin containing 50 to 90 parts by weight of a polypropylene block copolymer and 10 to 50 parts by weight of a thermoplastic elastomer containing an ethylene propylene copolymer, 50 to 150 parts by weight, and 30 to 100 parts by weight of a halogen-based flame retardant aid.

Here, the flame retardant polyolefin resin composition further comprises a CMP flame retardant rated flame retardant UTP cable, wherein the flame retardant polyolefin resin composition further comprises 2 to 10 parts by weight of a polar group-introduced reactive polyolefin based on 100 parts by weight of the base resin.

On the other hand, the non-combustible polyolefin resin composition includes a high density polyethylene resin, and provides a CMP flame retardant grade UTP cable.

Also, the metal hydroxide flame retardant is characterized by containing magnesium hydroxide (Mg (OH) ₂ ).

Here, the metal hydroxide flame retardant is not surface-treated, and a CMP flame retardant grade flame retardant UTP cable is provided.

Also, the resin composition for forming the outer jacket may further include 2 to 5 parts by weight of zinc borate based on 100 parts by weight of the flame retardant polyvinyl chloride, to provide a CMP flame retardant rated flame retardant UTP cable.

Further, the resin composition forming the outer jacket has a CMP flame retardant rated flame retardant UTP cable characterized by a limit oxygen index (LOI) of 60% or more.

The present invention also provides a CMP flame retardant rated flame retardant UTP cable, further comprising a separator including a plurality of partitions disposed between each of the plurality of pair units to maintain the arrangement of the plurality of pair units.

The present invention also provides a CMP flame retardant grade flame retardant UTP cable, which further comprises a rib cord that facilitates dissipation of the outer jacket.

The flame retardant UTP cable according to the present invention exhibits excellent effects of having a flame retardant property of CMP (Communication Plenum) even though a specific flame retardant insulator and an outer jacket do not apply a fluororesin insulator.

In addition, the flame-retardant UTP cable according to the present invention is not environmentally friendly and does not apply a fluorine-based insulating material, which is environmentally friendly, and reduces manufacturing costs by discharging noxious gases such as fluorine gas during incineration or fire. .

Further, the flame-retardant UTP cable according to the present invention exhibits excellent effects in that the thickness and volume of the cable do not increase in spite of achieving sufficient flame retardance and electrical characteristics simultaneously by varying the insulator material used in the pair unit.

1 schematically shows a cross-sectional structure of a 4-pair UTP cable in which four pairs of units are wrapped with an outer jacket.
2 schematically illustrates a cross-sectional structure of a CMP flame retardant UTP cable according to an embodiment of the present invention.
3 is a schematic view of a longitudinal section of a CMP flame retardant UTP cable 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 this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

2 schematically illustrates a cross-sectional view of a CMP flame retardant UTP cable according to an embodiment of the present invention.

2, the CMP flame retardant UTP cable according to the present invention includes a plurality of conductive wires 110 formed by insulated conductive metal wires 111 insulated by an insulator 112, and preferably two wires 110 are twisted at a constant pitch A plurality of pair units 100 formed as a load and an outer jacket 300 surrounding the plurality of pair units 100.

The standard and the material of the conductive metal wire 111 are in accordance with the UTP cable international standard (ANSI / TIA / EIA 568A). For example, the conductive metal wire 111 may be made of a material such as copper, annealed copper, tinned copper, or the like, and may be a solid wire or a stranded wire , Preferably stranded to improve the flexibility of the UTP cable. The outer diameter of the conductive metal wire 111 may be about 0.5 to 0.6 mm when the conductive metal wire 111 is broken, and the small wire diameter may be about 0.203 mm when the conductive metal wire 111 is twisted.

The insulator 112 constituting the at least one pair unit 100 of the plurality of the pair units 100 may include a flame retardant polyolefin (FRPO) resin composition, preferably a flame retardant polypropylene (FRPP) resin composition.

The flame retardant polyolefin resin composition may include, for example, a base resin, a flame retardant, a flame retardant aid, and other additives. The base resin may include, for example, 50 to 90 parts by weight of a polyolefin resin and 10 to 50 parts by weight of a thermoplastic polyolefin elastomer resin based on 100 parts by weight in total. Further, in order to improve the initial modulus, the reactive polyolefin having a polar group introduced therein may be further added in an amount of 2 to 10 parts by weight.

The polyolefin resin may be a homopolymer or a random or block copolymer, and a block copolymer is preferable in consideration of cold resistance and mechanical properties. When the content of the polyolefin resin is less than 50 parts by weight, the hardness of the polyolefin resin is lowered, and when the lead wire 110 is twisted to manufacture the pair unit 100, insulator pressing occurs and the scratch resistance is lowered, On the other hand, if it exceeds 90 parts by weight, elongation and flexibility may be lowered. The polyolefin preferably has a melting flow rate (MFR) (2.16 kg, 230 ° C) of 3 to 15.

The thermoplastic polyolefin elastomer resin may be, for example, a thermoplastic elastomer including a copolymer of ethylene and another? -Olefin, for example, an ethylene propylene copolymer or a styrene-ethylene-butylene-styrene copolymer, It is preferable to use a thermoplastic elastomer containing an ethylene- -olefin copolymer. The reactive polyolefin to which the polar group is introduced is preferably polypropylene grafted with maleic anhydride, glycidyl methacrylate or the like. The thermoplastic polyolefin elastomer resin may preferably have MFR (2.16 kg, 230 ° C) of 3 to 15.

The flame retardant may be added in an amount of 50 to 150 parts by weight based on 100 parts by weight of the base resin. The flame retardant may be, for example, a metal hydroxide such as magnesium hydroxide, aluminum hydroxide, etc., and may be surface-treated or surface-treated with silane, stearic acid or the like. When the content of the flame retardant is less than 50 parts by weight, the flame retardancy may be insufficient, while when it is more than 150 parts by weight, processability and electrical characteristics may be deteriorated.

The flame-retardant auxiliary may be a halogen-based flame-retardant auxiliary such as a bromine-based flame retardant or an antimony-based flame retardant auxiliary such as antimony trioxide. The halogen-based flame retardant auxiliary may be used in an amount of 30 to 100 parts by weight based on 100 parts by weight of the base resin, 5 to 100 parts by weight.

When the content of the halogen-based flame-retardant aid is less than 30 parts by weight and the content of the antimony-based flame-retardant aid is less than 5 parts by weight, the flame retardancy is not synergistic, while when it exceeds 100 parts by weight, the ductility and electrical properties . As the other additives that may be included in the flame-retardant polyolefin resin composition, a small amount of a lubricant, an antioxidant, a processing aid or the like may be used depending on other purposes.

The flame retardant polyolefin resin composition preferably has a dielectric constant (@ 1 MHz) of 2.9 or less, a critical oxygen index (LOI) of 30% or more, a smoke density (ASTM E662, Flaming mode, Dm) ° C) of not less than 5 g / 10 min, and exhibits sufficient electrical properties, mechanical properties, flame retardancy, and versatility due to the above constitution and physical properties.

The insulator 112 constituting the at least one pair unit 100 of the plurality of the pair units 100 is a non-burned insulating resin composition, preferably a polyolefin resin such as polyethylene or polypropylene, more preferably a high- ≪ / RTI > Polyethylene vinyl acetate (EVA) and polyvinyl chloride (PVC) may be considered as insulated insulation materials. EVA and PVC, however, have a dielectric constant and a dielectric loss due to the presence of a polar group in the molecule. Is not suitable for the insulating material of

Unlike the flame retardant polyolefin resin composition, the non-burned insulation resin composition is excellent in electrical characteristics because no flame retardant, additives, or the like for increasing the dielectric constant is added. In addition, Since the UTP cable has a volume of 85 to 95%, it is possible to reduce the size and weight of the UTP cable.

3 is a schematic view of a longitudinal section of a CMP flame retardant UTP cable according to an embodiment of the present invention.

As shown in FIGS. 2 and 3, the CMP flame retardant UTP cable according to the present invention has a plurality of the pair units 100 disposed adjacent to each other within one outer jacket 300, A phenomenon of being adversely influenced such as generation of noise in the transmission signal of another adjacent pair unit 100 due to the electromagnetic field formed by the flowing current may occur, that is, a crosstalk phenomenon may occur, and such crosstalk phenomenon may be suppressed or minimized Each pair unit 100 has a structure in which a plurality of lead wires 110 are twisted at a constant pitch.

As described above, the insulator 112a of the conductor 110a constituting the at least one first pair unit 100a of the plurality of the pair units 100 is formed of the flame-retardant polyolefin resin composition, The insulator 112b of the conductor 110b constituting the two-pair unit 100b may be formed of the non-burned insulating resin composition.

Since the flame retardant polyolefin resin and the non-burned insulation resin have different dielectric constants, the UTP cable including the first and second pair units 100a and 100b composed of the different insulators 112a and 112b has a signal phase difference, Time delay or the like may occur.

Therefore, the twist pitch of the second pair unit 100b composed of the insulator 112b formed of the non-burning insulating resin having a relatively low dielectric constant as compared with the flame retardant polyolefin resin whose dielectric constant has been increased by the addition of the flame retardant, It is possible to suppress or minimize the problem of the signal phase difference and arrival time delay of the UTP cable by designing the UTP cable so as to be shorter than the twist pitch of the 1-pair unit 100a. Here, it is preferable that the difference in transmission speed between the first pair unit 100a and the second pair unit 100b is 45 ns or less.

For example, the twist pitch of the first pair unit 100a may be about 0.6 to 1.2 inches, the twist pitch of the second pair unit 100b may be about 0.3 to 0.53 inches, The number of the first pair unit 100a may be two or three, and the number of the second pair unit 100b may be one or two. The plurality of first pair units 100a may be twisted at different pitches, and the plurality of first pair units 100b may be twisted at different pitches.

Particularly, in the four-pair UTP cable, the second pair unit 100b having the shortest twist pitch and the first pair unit 100a or the second pair unit 100b having the shortest twist pitch next to each other are spaced apart from each other It is preferable to arrange them at diagonal positions.

In the present invention, the outer jacket 300 is preferably made of a resin composition containing flame retardant polyvinyl chloride (PVC). The flame retardancy of the flame retardant polyvinyl chloride (PVC) preferably has a limited oxygen index (LOI) of 45 to 60%, preferably 50 to 55%. A flame retardant flame retardant polyvinyl chloride (PVC) having a limit oxygen index (LOI) of more than 60% is very expensive and thus has a problem of excessively raising the unit price of a UTP cable.

The resin composition constituting the outer jacket 300 may further include a flame retardant in addition to flame retardant polyvinyl chloride (PVC) having a limiting oxygen index (LOI) of 45 to 60%. The flame retardant may preferably include metal hydroxides such as magnesium hydroxide (Mg (OH) ₂ ), aluminum hydroxide (Al (OH) ₃ ). The metal hydroxide flame retardant is advantageous in that it has a low heat generating effect as well as a flammability due to an endothermic effect due to dehydration reaction and has no toxic gas.

However, in the case of aluminum hydroxide (Al (OH) ₃ ), the resin composition for forming the outer jacket 300 can be decomposed according to the processing temperature during extrusion, and consequently, the physical and flame retardancy of the outer jacket 300 Magnesium hydroxide (Mg (OH) ₂ ) is preferable.

The metal hydroxide flame retardant may be added in an amount of 5 to 10 parts by weight based on 100 parts by weight of the flame retardant polyvinyl chloride (PVC). If the content of the metal hydroxide flame retardant is less than 5 parts by weight, the flame retardancy may be insufficient. On the other hand, when the amount of the metal hydroxide flame retardant exceeds 10 parts by weight, the outer jacket 300 may be discharged to the outside during extrusion molding, or the moldability may be deteriorated.

The surface of the metal hydroxide flame retardant may be treated with silane or the like in order to improve the compatibility with polyvinyl chloride (PVC). However, the surface treatment may reduce the flame retardancy of the outer jacket 300, It is preferable not to perform the surface treatment of the metal hydroxide flame retardant from this viewpoint.

The resin composition constituting the outer jacket 300 can improve the limiting oxygen index (LOI) to 50 to 65% by adding the metal hydroxide flame retardant to the flame retardant polyvinyl chloride (PVC) LOI) is more than 60% compared to flame-retardant flame retardant polyvinyl chloride.

The resin composition constituting the outer jacket 300 may further include a flame retardant auxiliary agent. The flame retardant aid may include inorganic flame retardants such as zinc borate, sodium silicate, molybdenum compound, ammonium phosphate, ammonium carbonate, ammonium polyphosphate, and red phosphorus, or a combination thereof, preferably zinc borate.

The metal hydroxide flame retardant added to the resin composition constituting the outer jacket 300 may degrade the molding processability, water resistance, mechanical performance, etc. of the resin composition during the mass blending. Therefore, by applying the flame retardant aid, The need can be reduced. In addition, zinc borate as the flame retardant auxiliary agent can further improve the build-up resistance, which is a characteristic of suppressing the generation of smoke.

The flame retardant aid may be 2 to 5 parts by weight based on 100 parts by weight of the flame retardant polyvinyl chloride (PVC). If the content of the flame-retardant aid is less than 2 parts by weight, the flame retardancy synergistic effect and the improvement of the barrier properties may be insufficient, while if it exceeds 5 parts by weight, the moldability and mechanical properties of the resin composition may be deteriorated.

In the flame-retardant UTP cable according to the present invention, the outer jacket 300 exhibits sufficient flame retardancy and transmission properties by the above-described structure, and at the same time, the manufacturing cost of the UTP cable can be reduced.

The flame-retardant UTP cable according to the present invention includes a plurality of pairs of barrier ribs disposed between the plurality of pair units 100 so as to maintain the arrangement of the plurality of pair units 100 in the outer jacket 300 400). ≪ / RTI > The separator 400 functions to improve the structural stability of the UTP cable by stably maintaining the arrangement of the plurality of the pair units 100 and improving the resistance of the outer jacket 300 to the external pressure. The separator 400 may be made of the same material as or different from the material of the outer jacket 300.

The flame retardant UTP cable according to the present invention may further include a lip cord 500 inside the outer jacket 300. The rib cords 500 are used to facilitate removal of the outer jacket 300 and include a Kevlar aramid yarn, a fiber glass epoxy rod, a fiber reinforced polyethylene (FRP) Polyethylene, high strength fiber, galvanized steel wire, and steel wire, the function as a tensile wire for imparting a tensile strength to the UTP cable can be performed in parallel.

<Examples>

1. Example of an insulating layer made of a flame-retardant polyolefin resin

end. Manufacturing example

Insulating compositions according to Examples and Comparative Examples were prepared by using a twin screw extruder at 210 ° C in the components and contents shown in Table 1 below. The unit of the content shown in Table 1 is parts by weight.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Resin 1 70 80 67 95 70 70 Resin 2 30 20 5 30 30 Resin 3 30 Resin 4 3 Flame Retardant 1 100 80 70 160 80 Flame Retardant 2 60 Flame Retarding Agent 1 30 40 40 40 30 110 Flame Retarding Agent 2 20 30 20 30 20 20 Talc 5 10 5 5 Antioxidant One One One One One One Lubricant One One One One One One Processing aid One One One One One One

Resin 1: Polypropylene (MFR: 10 g / 10 min (2.16 kg, @ 230 DEG C))

Resin 2: ethylene propylene elastomer (MFR: 3.2 g / 10 min (2.16 kg, @ 230 ° C))

Resin 3: Ethylene propylene elastomer (MFR: 0.6 g / 10 min (2.16 kg, @ 230 ° C))

Resin 4: Polypropylene grafted with maleic anhydride (MFR: 0.9 g / 10 min (2.16 kg, @ 230 ° C))

Flame Retardant 1: Magnesium hydroxide surface-treated with a lubricant

Flame retardant 2: Magnesium hydroxide surface-treated with silane

Flame Retarding Agent 1: Bromine Flame Retardant

Flame Retarding Agent 2: Antimony Trioxide

I. Property evaluation

(1) Evaluation of mechanical properties

The insulation material shall have an elongation of not less than 100% and a melt flow rate (MFR) (2.16 kg, @ 230 ℃) of 5 g / 10 min or more as measured in accordance with ASTM D1238 when evaluated in accordance with UL444.

(2) Evaluation of dielectric constant

In order to satisfy sufficient electrical properties, the dielectric constant should be 2.9 or less.

(3) Evaluation of flame retardancy

The LOI of the insulating material shall be not less than 30%, and the specimen 2 mm shall have a smoke density (ASTM E662, Flaming mode, Dm) of 500 or less.

The results of evaluating the physical properties are shown in Table 2 below.

Properties unit Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Elongation rate % 150 300 350 85 120 250 Melt flow rate g / 10 min 5.5 6.0 5.7 5.5 5.0 3.5 permittivity 2.75 2.88 2.82 2.70 3.21 2.90 Marginal oxygen index % 32.5 34.0 33.0 33.5 35.5 40.0 Smoke density 450 400 430 480 380 650

As shown in Table 2, the insulator of Comparative Example 1 contained an excessive amount of hard polypropylene resin and contained a small amount of soft elastomer resin, so that the elongation percentage of the insulating watch composition was less than 100% and insulator of Comparative Example 2 was insufficient Comparative Example 3 contained an excess amount of the halogen-based flame retardant aid to significantly suppress the smoke-retarding performance of the smoke-retarding agent to 500 and the melt flow rate to 5 g / m &lt; 2 &gt; 10min, respectively.

On the other hand, Examples 1 to 3, which are insulators used in the UTP cable of the present invention, were found to have excellent balance of mechanical properties such as elongation and melt flow rate, electrical characteristics, flame retardancy, and conductivity.

2. Examples of outer jacket and UTP cable

end. Manufacturing example

An outer jacket made of the PVC resin composition prepared according to Examples and Comparative Examples and an insulating layer made of the insulating composition according to Example 1 at 210 ° C using a twin screw extruder at the components and contents shown in Table 3 below . 5e 4-pair UTP cable specimens were prepared. The unit of the content shown in Table 2 below is parts by weight.

Constituent Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Suzy 200 200 200 200 200 200 200 200 200 Flame retardant 10 20 10 20 - - - 5 30 Flame Retardant
Supplements 5 5 - - - 5 10 5 5

Resin: Flame retardant polyvinyl chloride (PVC) (manufacturer: Teknor Apex; product name: 910A-60NL)

Flame retardant: Magnesium hydroxide

Flame Retarding Agent: Zinc Borate

I. Property evaluation

(1) Evaluation of mechanical properties

The tensile strength and elongation of the outer jacket were measured in accordance with UL444, and the tensile strength was 1.76 kgf / ㎟ or more and elongation was 100% or more.

(2) Evaluation of flame retardancy

Flame propagation and flammability were measured in accordance with NFPA 262 standard. Flame propagation, which indicates flame retardancy, should be less than 5 ft and smoke smoke density, ie peak smoke emission and average smoke emission, less than 0.5 and 0.15, respectively.

The physical property evaluation results are shown in Table 4 below.

Properties Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Tensile strength (kgf / ㎟) 1.88 1.82 1.87 1.81 2.01 1.92 1.83 1.93 1.68 Elongation (%) 185 182 191 174 198 188 186 195 164 Flame prop. (Ft) 3.5 3.0 4.5 4.0 6.0 6.0 5.5 5.5 3.0 peak smoke emission 0.38 0.35 0.60 0.55 0.75 0.49 0.45 0.47 0.33 평균 0.11 0.10 0.15 0.15 0.21 0.16 0.14 0.13 0.10

As shown in Table 4, in Comparative Examples 1 to 4, the flame retardant was not added to the flame retardant PVC resin constituting the outer jacket, or the flame propagation was insufficient because the content was insufficient. In Comparative Example 5, The tensile strength of the outer jacket was significantly damaged.

On the other hand, it was confirmed that the UTP cable to which the outer jacket of Examples 1 to 4 according to the present invention was applied had sufficient mechanical properties and flame retardancy of the outer jacket.

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 or 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.

100: Pair unit 300: Outer jacket
400: Separator 500: Lip cord

Claims (17)

A plurality of pari units formed by twisting a plurality of conductive wires including a conductor and an insulator surrounding the conductor, and an outer jacket surrounding the plurality of pair units;
Wherein the plurality of pairs of units comprises at least one first pair unit formed by twisting a plurality of wires each including an insulator formed from a flame retardant polyolefin resin composition and a plurality of conductors including an insulator formed from the non-soft polyolefin resin composition CMP flame retardant grade UTP cable, characterized in that it comprises at least one second pair unit formed as a load. The method according to claim 1,
Wherein the flame-retardant polyolefin resin composition has a dielectric constant of 2.9 or less, a limited oxygen index (LOI) of 30% or more, a smoke density measured according to ASTM E662 of 500 or less and a melt flow rate (2.16 kg, g / 10 min. &lt; / RTI &gt; The method according to claim 1,
The outer jacket is formed from a resin composition comprising a flame retardant polyvinyl chloride resin having a limiting oxygen index (LOI) of 45 to 60% and 5 to 10 parts by weight of a metal hydroxide flame retardant based on 100 parts by weight of the flame retardant polyvinyl chloride resin , CMP flame retardant grade UTP cable. 4. The method according to any one of claims 1 to 3,
Wherein the second pair unit is one, the twist pitch of the second pair unit is shorter than the twist pitch of each of the plurality of first pair units, and the twist pitch of the lead among the plurality of first pair units is the shortest, CTP flame retardant grade UTP cable, wherein the unit is disposed at a diagonal line that is most distant from the second pair unit. 4. The method according to any one of claims 1 to 3,
The twist pitch of each of the two second pair units is shorter than the twist pitch of each of the plurality of first pair units and the two second pair units are arranged at diagonal positions CMP flame retardant grade UTP cable. 4. The method according to any one of claims 1 to 3,
Wherein the twist pitch of the first pair unit is 0.6 to 1.2 inches and the twist pitch of the second pair unit is 0.3 to 0.53 inches. 4. The method according to any one of claims 1 to 3,
Wherein a difference in transmission speed between the first pair unit and the second pair unit is 45 ns or less. 4. The method according to any one of claims 1 to 3,
Wherein the volume of the insulator forming the second pair unit is 85 to 95% of the volume of the insulator forming the first pair unit. 4. The method according to any one of claims 1 to 3,
Wherein the flame-retardant polyolefin resin composition comprises 50 to 90 parts by weight of a polypropylene block copolymer and 10 to 50 parts by weight of a thermoplastic elastomer comprising an ethylene propylene copolymer, 50 to 100 parts by weight of a metal hydroxide flame retardant, And 30 to 100 parts by weight of a halogen-based flame retardant aid. 10. The method of claim 9,
Wherein the flame retardant polyolefin resin composition further comprises 2 to 10 parts by weight of a reactive polyolefin having a polar group introduced therein based on 100 parts by weight of the base resin. 4. The method according to any one of claims 1 to 3,
Wherein the non-combustible polyolefin resin composition comprises a high-density polyethylene resin. 4. The method according to any one of claims 1 to 3,
Wherein the metal hydroxide flame retardant comprises magnesium hydroxide (Mg (OH) ₂ ). 13. The method of claim 12,
Wherein the metal hydroxide flame retardant is not surface treated. 4. The method according to any one of claims 1 to 3,
Wherein the resin composition forming the outer jacket further comprises 2 to 5 parts by weight of zinc borate based on 100 parts by weight of the flame retardant polyvinyl chloride. 4. The method according to any one of claims 1 to 3,
A CMP flame retardant UTP cable characterized in that the resin composition forming the outer jacket has a limiting oxygen index (LOI) of at least 60%. 4. The method according to any one of claims 1 to 3,
Further comprising a separator including a plurality of partitions disposed between each of said plurality of pair units to maintain the arrangement of said plurality of pair units. 4. The method according to any one of claims 1 to 3,
Further comprising a lip cord that facilitates removal of the outer jacket. &Lt; RTI ID = 0.0 &gt; A &lt; / RTI &gt;

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