KR101621028B1 - Protection tube for electric cable using recycling material - Google Patents

Protection tube for electric cable using recycling material Download PDF

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Publication number
KR101621028B1
KR101621028B1 KR1020150101210A KR20150101210A KR101621028B1 KR 101621028 B1 KR101621028 B1 KR 101621028B1 KR 1020150101210 A KR1020150101210 A KR 1020150101210A KR 20150101210 A KR20150101210 A KR 20150101210A KR 101621028 B1 KR101621028 B1 KR 101621028B1
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South Korea
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layer
intermediate layer
protection tube
present
inner layer
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KR1020150101210A
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Korean (ko)
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이봉주
임진성
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주식회사 현대피엠씨
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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
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • 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
    • 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
    • H01B3/44—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 vinyl resins; acrylic resins
    • 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
    • H01B7/0225—Three or more layers

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

More particularly, the present invention relates to a wire protection tube having a multi-layer structure using a recycled synthetic resin material.
The present invention has a three-layer structure including an inner layer for providing a space for accommodating electric wires, an intermediate layer surrounding the outer periphery of the inner layer, and an outer layer surrounding the outer periphery of the intermediate layer. The inner layer and the outer layer are made of recycled PET, Wherein the intermediate layer is formed of a material mixed with HDPE material, and the intermediate layer has a through hole in the longitudinal direction.

Description

PROTECTION TUBE FOR ELECTRIC CABLE USING RECYCLING MATERIAL BACKGROUND OF THE INVENTION [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a wire protecting tube used in a building, and more particularly, to a wire protecting tube having a multi-layer structure using a recycled synthetic resin material.

Generally, when a power cable or a communication cable is laid on the inside or the ground of a building, a cable protection tube is installed along the installation route, and a wire is housed in the protection tube to be protected.

As a related literature, Korean Patent Registration No. 10-1373305 (published on Mar. 11, 2014) entitled "Protection cable for preventing leakage of cooling water, its manufacturing method and manufacturing apparatus" is available.

An object of the present invention is to provide a wire protecting tube which can satisfy the mechanical strength required in a wire protecting tube by using a recycled synthetic resin.

It is another object of the present invention to provide a wire protection tube which has a multi-layer structure and prevents a crack from propagating to the inside even if a crack is generated due to external pressure.

It is another object of the present invention to provide a wire protecting tube having a through hole in the longitudinal direction and having a sound insulating effect and a heat insulating effect by the through hole.

The present invention has a three-layer structure including an inner layer for providing a space for accommodating electric wires, an intermediate layer surrounding the outer periphery of the inner layer, and an outer layer surrounding the outer periphery of the intermediate layer. The inner layer and the outer layer are made of recycled PET, Wherein the intermediate layer is formed of a material mixed with HDPE material, and the intermediate layer has a through hole in the longitudinal direction.

The intermediate layer is preferably a recycled LDPE material.

The inner layer and the outer layer are preferably formed by mixing the recycled PET material and the recycled HDPE material at a weight ratio of 8: 2 and adding 5 to 20% of a compatibilizer.

The thickness ratio of the inner layer, the intermediate layer, and the outer layer is preferably 1: 4: 2.

It is more preferable that the through hole is formed in a hexagonal cross-sectional shape, and the intermediate layer is formed into a honeycomb structure.

The wire protection tube according to the present invention is manufactured using recycled synthetic resin, thereby improving the resource recycling rate.

The wire protection tube according to the present invention is formed in a multi-layered structure and has a plurality of through holes in the longitudinal direction thereof, so that it is possible to reduce the weight of the product.

The wire protection tube according to the present invention is formed in a multi-layered structure, and the intermediate layer is made of a material having a relatively low strength, so that even when cracks are generated due to damage to the outer layer tube, cracks generated in the intermediate layer can be absorbed in the intermediate layer, Effect.

1 is a cross-sectional view of a wire protection tube according to an embodiment of the present invention,
FIG. 2 is a partially cutaway perspective view of a wire protection tube according to an embodiment of the present invention. FIG.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or preliminary meaning and the inventor shall properly define the concept of the term in order to describe its invention in the best possible way It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. It should be noted that the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention, It should be understood that various equivalents and modifications are possible.

FIG. 1 is a cross-sectional view of a wire protection tube according to an embodiment of the present invention, and FIG. 2 is a partially cut-away perspective view of a wire protection tube according to an embodiment of the present invention.

As shown in the drawings, the wire protection tube 100 according to the embodiment of the present invention is formed in a three-layer structure.

An intermediate layer 120 surrounding the outer surface of the inner layer 110 and an outer layer 130 surrounding the outer surface of the intermediate layer 120. [

The inner layer 110 and the outer layer 130 are made of a material having a relatively high strength and the intermediate layer 120 is made of a material having a relatively low strength.

The intermediate layer 120 is formed to have a plurality of through holes 122 formed in the longitudinal direction of the electric wire protecting tube 100.

The through hole 122 formed in the intermediate layer 120 is formed to have a hexagonal cross section so that the intermediate layer 120 can be formed into a honeycomb structure.

If the intermediate layer 120 is formed in a honeycomb structure, even if the through holes 122 are formed, the mechanical strength can be maintained.

The through hole 122 formed in the intermediate layer 120 functions to function as a short hole or a suction hole.

Such a multi-layered wire protection tube 100 can be manufactured by a co-extrusion method.

The ratio of the thickness of the inner layer 110, the intermediate layer 120, and the thickness of the outer layer 130 is preferably 1: 4: 2. The outer layer 130 has a relatively thicker thickness than that of the inner layer 110 because the pressure is not applied to the inner portion due to the characteristics of the installation environment of the wire protection tube 100 and the possibility of external impact is high. It is preferable to secure the strength to the above.

In addition, the intermediate layer 120 is formed of a material having a relatively low strength, and it is preferable that the intermediate layer 120 is thicker than the outer layer in order to provide a sound absorbing effect and a crack propagation preventing effect. Since the plurality of through holes 122 are formed in the intermediate layer 120 as described above, the increase in the total weight due to the increase in the thickness of the intermediate layer 120 is less than that in the other layers, If you take it, you can get the overall weight reduction and cost saving effect.

In the wire protecting tube 100 according to the present invention, the inner layer 110 and the outer layer 130 are made of a material in which recycled high density polyethylene (HDPE) material and recycled PET (polyethylene terephthalate) And the intermediate layer 120 is preferably made of a recycled low-density polyethylene material.

The inner layer 110, the intermediate layer 120, and the outer layer 130 both include a polyethylene material, so that the binding force at the interface between the layers can be increased. Also, by using a material having a low density in the intermediate layer 120, which requires a relatively low strength, it is possible to reduce the overall weight.

Polyethylene (polyethylene) is the most widely used synthetic polymer material. It is divided into HDPE and LDPE (low density polyethylene) depending on the density, and is easy to recycle.

In addition, the PET material is a general-purpose engineering plastic, and is widely used for applications such as synthetic fiber, biaxially stretched film, and food and beverage mercury, because it is excellent in transparency close to glass, high in strength, excellent in heat insulation property and excellent in gas barrier property.

HDPE and PET are high molecular materials that account for a large amount of waste plastics generated in Korea. When two polymers are simply mixed, they are low in comparison with the physical properties of each polymer due to incompatibility.

When the waste PET resin is reprocessed by the material recycling method, there is a disadvantage that the processability and the mechanical properties are significantly lowered due to the hydrolysis and pyrolysis characteristics of the resin itself.

The present invention is characterized in that a recycled PET material and a recycled HEPE material are mixed with the inner layer 110 and the outer layer 130 so as to be suitable for the mechanical properties required in the cable protection tube.

In order to improve the deterioration of physical properties which are problematic in polymer blending processing, a random copolymer, a graft copolymer, a block copolymer and the like are generally used as a compatibilizer.

The random copolymer improves the effect of compatibilization by introducing a reactive group and shows a commercialization effect by forming a chemical bond by reacting with the constituent polymer at the time of mixing. Block copolymers and graft copolymers are formed by linking polymer chains of two different components to one polymer. When it is used as a compatibilizer, it becomes easy to locate thermodynamically at the interface and the interfacial tension becomes low, So as to uniformly disperse on the continuous surface and improve the adhesion between the interfaces.

Example

Manufacture of recycled synthetic resin mixture

The pulverized waste PET and the waste HDPE were dried, and the mixture ratio of PET and HDPE was adjusted to a weight ratio of 8: 2. Then, the waste PET material and the waste HDPE material were pulverized to a size of 5 mm or less in diameter, And the pellets were dried again and compression molded to prepare test specimens.

The tensile strength and the impact strength were evaluated by varying the mixing ratio of waste PET material, waste HDPE material and compatibilizer.

The compatibilizer was used to improve the mechanical properties of waste PET and waste HDPE mixed resin, and to observe the change of the physical properties of the molded body according to the compatibilizing agent. SE-11 (SEBE, K), EM Polybond 1009 (PE-g-AA, Uniroyal) and Elvaloy (E / nBA / GMA, Dupont) were used alone or in combination.

The resin mixture (95 ~ 80 wt%) and the compatibilizer (5 ~ 20 wt%) were dried, mixed, and heated at 230 ~ 290 < 0 & The pellets were extruded and extruded, and the pellets were dried again, followed by compression molding to prepare specimens, and tensile strength and impact strength were measured.

The tensile strength was measured at a crosshead speed of 50 mm / min using a universal testing machine (HTE-5000N, Hounsfield) after specimen processing according to the standard of ASTM D638.

The impact strength was tested using an impact strength tester (SJI-00, sunjin) after V-notching according to ASTM D256.

Table 1 shows the tensile strength and impact strength according to the composition.

Figure 112015069098316-pat00001

As can be seen from Table 1, when the compatibilizing agent is added, the tensile strength characteristics are improved by 40% or more as compared with the case where no compatibilizing agent is added.

As described above, the wire protecting tube according to the present invention can produce a product satisfying the mechanical characteristics required in the wire protecting tube by recycling the discarded PET, HDPE and LDPE. By forming the multi-layered structure, It is possible to prevent damage to the semiconductor device.

It is to be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and the scope of the present invention will be indicated by the appended claims rather than by the foregoing detailed description. It is intended that all changes and modifications that come within the meaning and range of equivalency of the claims, as well as any equivalents thereof, be within the scope of the present invention.

100: Cable protection pipe
110: inner layer
120: middle layer
122: Through hole
130: outer layer

Claims (5)

A thickness ratio of the inner layer, the intermediate layer, and the outer layer is in the range of 1: 1 to 1: 1, and the thickness of the inner layer, the intermediate layer, and the outer layer is 1: 4: 2,
The inner layer and the outer layer are formed by mixing a recycled PET material and a recycled HDPE material at a weight ratio of 8: 2 and adding 5 to 20% of a compatibilizer,
Wherein the intermediate layer is formed of a recycled LDPE material having a relatively lower strength than the inner layer and the outer layer,
Wherein the intermediate layer has a through hole having a hexagonal cross-sectional shape in the longitudinal direction, the intermediate layer is formed in a honeycomb structure,
Wherein a crack generated even when a crack is generated in the outer layer is cut off by the through hole of the intermediate layer so as not to be transmitted to the inner layer.


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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108384090A (en) * 2018-02-11 2018-08-10 江阴爱科森博顿聚合体有限公司 A kind of special HDPE material of cable jacket and its manufacturing method
CN112735648A (en) * 2020-12-24 2021-04-30 四川新东方电缆集团有限公司 Resistance to compression formula cable
KR20220040549A (en) * 2020-09-23 2022-03-31 임진성 Multi-layer water tank
KR20240085320A (en) 2022-12-07 2024-06-17 한국기술교육대학교 산학협력단 Additive for mixture of PET and HDPE, manufacturing method for the same, recycling method for mixture of PET and HDPE using the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012242393A (en) 2011-05-20 2012-12-10 Ge Medical Systems Global Technology Co Llc Panel support plate, detector, and x-ray imaging system
KR101267895B1 (en) 2013-02-27 2013-05-27 주식회사 현대피닉스 5 layer pvc pipe and manufacturing method of the smae

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012242393A (en) 2011-05-20 2012-12-10 Ge Medical Systems Global Technology Co Llc Panel support plate, detector, and x-ray imaging system
KR101267895B1 (en) 2013-02-27 2013-05-27 주식회사 현대피닉스 5 layer pvc pipe and manufacturing method of the smae

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108384090A (en) * 2018-02-11 2018-08-10 江阴爱科森博顿聚合体有限公司 A kind of special HDPE material of cable jacket and its manufacturing method
KR20220040549A (en) * 2020-09-23 2022-03-31 임진성 Multi-layer water tank
KR102448267B1 (en) * 2020-09-23 2022-09-28 임진성 Multi-layer water tank
CN112735648A (en) * 2020-12-24 2021-04-30 四川新东方电缆集团有限公司 Resistance to compression formula cable
KR20240085320A (en) 2022-12-07 2024-06-17 한국기술교육대학교 산학협력단 Additive for mixture of PET and HDPE, manufacturing method for the same, recycling method for mixture of PET and HDPE using the same

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