JP4511131B2 - Cable disassembly method - Google Patents
Cable disassembly method Download PDFInfo
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- JP4511131B2 JP4511131B2 JP2003175216A JP2003175216A JP4511131B2 JP 4511131 B2 JP4511131 B2 JP 4511131B2 JP 2003175216 A JP2003175216 A JP 2003175216A JP 2003175216 A JP2003175216 A JP 2003175216A JP 4511131 B2 JP4511131 B2 JP 4511131B2
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- JP
- Japan
- Prior art keywords
- sheath
- water
- shielding layer
- water shielding
- cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 50
- 239000000853 adhesive Substances 0.000 claims description 20
- 230000001070 adhesive effect Effects 0.000 claims description 20
- 238000000926 separation method Methods 0.000 claims description 10
- 239000004020 conductor Substances 0.000 claims description 7
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 5
- 239000004800 polyvinyl chloride Substances 0.000 claims description 5
- 229920000728 polyester Polymers 0.000 claims description 3
- 229920000098 polyolefin Polymers 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- -1 polyethylene Polymers 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000012212 insulator Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 150000002611 lead compounds Chemical class 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/82—Recycling of waste of electrical or electronic equipment [WEEE]
Landscapes
- Processing Of Solid Wastes (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Description
【０００１】
【産業上の利用分野】
本発明は、遮水層を有するケーブルの解体方法に関する。
【０００２】
【従来の技術】
例えば、電力ケーブルにおいては、導体の上に内部半導電層、架橋ポリエチレンより成る絶縁体、外部半導電層、ポリ塩化ビニルまたはポリエチレン等のシースが順に被覆されているが、外部から浸透してくる水分を遮断するため、外部半導電層とシースの間に鉛やアルミニウムなどの金属箔の片面または両面にポリエチレンテープなどをラミネートした遮水層が設けられている。
【０００３】
ところで、近年、電線やケーブルにおいても埋め立てや焼却時などの廃棄処理時に鉛化合物や塩素ガス等の有害物質が溶出・発生しないことや、解体した後でリサイクルが容易であること等環境への配慮が求められている。遮水層の材質についても電線・ケーブルの他部材と同様、非鉛化およびリサイクル性が検討され、従来使用されていた鉛からアルミニウムの適用が進められている。
【０００４】
遮水層は、一般にはポリオレフィン系接着剤でケーブルのシースと接着している場合が多く、一度接着すると分離をすることが困難であることから、遮水層付のシースの多くは、遮水層が接着したままの状態で産業廃棄物として埋め立て処理されているのが現状であった。また、一般にＣＶケーブルの寿命は３０年程度と言われており、ＣＶケーブルに遮水層が用いられるようになってから、間もなく２０年が経過することから、今後これらの遮水層を用いたケーブルが撤去されその廃棄処理量が増大し、その多くは鉛を使用した遮水層であることが予想される。
【０００５】
従来、シースと遮水層を分離するには、１００℃〜１５０℃程度に加熱して、接着材を溶解してから分離する方法や高温下で加圧して分離する方法等が行われていた（例えば、特許文献１参照）。
【０００６】
【特許文献１】
特開２０００−１１３７３８号公報 （段落番号「００１２」〜「００１７」、図１）
【０００７】
【発明が解決しようとする課題】
ところが、前記のようなシースと遮水層の分離方法では、加熱後に放置している間に冷却されて接着材が再び固化してしまい、分離が困難となるという問題があった。また、分離後のシースには遮水層の接着材が残るため、シースを再生した際に機械的特性、吸水性、加工性が低下するという問題があった。
【０００８】
本発明は、前記の問題を解決するためになされたもので、シースに遮水層が接着したケーブルを解体する際に、シースと遮水層を容易に分離する方法を提供することを目的とする。
【０００９】
【課題を解決するための手段】
本発明者らは、前記課題を解決するための方法について検討し、遮水層が接着した状態のシース部分を湿熱処理することで容易にシースと遮水層を分離することができることを見出し、本発明に至ったものである。
【００１０】
即ち、前記課題を解決するために、請求項１記載のケーブルの解体方法は、導体上に被覆されている遮水層とポリ塩化ビニルから成るシースとが接着剤で接着されているケーブルの解体方法において、前記シースから遮水層を分離するに際して、前記シースと遮水層とを９０℃の温水中に２４時間浸漬して分離することを特徴としている。
【００１１】
請求項２記載のケーブルの解体方法は、請求項１において前記接着剤はポリオレフィン系接着剤またはポリエステル系接着剤であることを特徴としている。
【００１２】
【発明の実施の形態】
以下、本発明の実施の形態を説明する。図１に遮水層を用いた電力ケーブルの断面を示す。中心から順に導体１、内部半導電層２、絶縁体３、外部半導電層４、金属遮蔽層５、遮水層６、シース７を示している。
【００１３】
このようなケーブルは撤去後には導体を引き抜いて解体され、導体以外の部分は、適当な大きさ、形状に切断される。本発明の遮水層の分離方法によれば、このように解体されたケーブルの遮水層が接着した状態のシース部分を湿熱処理することで、容易にシースと遮水層を分離することができる。ここで、湿熱処理とは、高温の湿度環境中に試料を暴露した状態での処理および試料を温水中に浸漬した状態での処理をいう。なお、高温の湿度環境中に試料を暴露する場合は高温中で水蒸気を試料に噴霧してもよい。本発明のケーブルの解体方法においては、後述するように、特に温水中に浸漬する場合に効果が大きい。湿熱処理の温度範囲としては、６０℃以上が好ましく、６０℃未満の温度では分離効果は小さくなる。
【００１４】
水質は特に問わないが一般の水道水の他に海水、界面活性剤水、酸性水、アルカリ性水なども用いることができる。シースがポリ塩化ビニルの場合には塩酸が含有されている水質が有効である。
【００１５】
このようにして、温水に浸漬した後では温水から取り出して放置し、室温程度の温度になった後でも、シースと遮水層の接着力は低下した状態が維持され、容易にシースと遮水層を分離することができる。また、分離後のシースには接着剤などが残らず、洗浄・乾燥すれば再生材料の特性もほとんど低下しない。
【００１６】
【実施例】
７７ｋＶ８０ｍｍ２ＣＶケーブルの遮水層付きポリ塩化ビニル製シースを用い、遮水層が接着されたシースを半円縦割りにして長さ１５ｃｍとした試験片を用いて、表１の条件で、シースから遮水層を分離するときの作業性、剥離力、分離後のシースの状態について評価した。遮水層は厚さ０．５ｍｍの鉛箔の片面に補強層として厚さ０．０５ｍｍのポリエチレンテレフタレートをラミネートし、他の片面に厚さ０．１ｍｍの半導電樹脂をラミネートしたテープを、ポリオレフィン系ホットメルト型接着剤でポリエチレンテレフタレートラミネート面側をシースに熱融着したものと、ポリエステル系接着剤でポリエチレンテレフタレートラミネート面側をシースに熱融着したものとを用いた。評価は以下の方法によって行った。
「作業性」：遮水層を適当長剥がすときの剥がしやすさを評価した。
「剥離力」：前記試験片から適当長剥がした遮水材を引張試験機の下部グリップ部に、他の部を上部グリップにセットし、角度１８０°、剥離速度１００ｍｍ／分で剥離力を測定した。
「分離後のシースの状態」：遮水層剥離後のシース表面の接着剤の残存状態を目視により評価した。
【００１７】
【表１】
表１に示すように、９０℃の温水に２４時間浸漬した後では、作業性は良好で剥離力も最も小さいのに対し、従来方法である９０℃湿度８％雰囲気中２４時間加熱後のものでは作業性が悪く、剥離力も大きくなっており、１２０℃雰囲気中２気圧３時間加熱後のものでは作業性は良いが、剥離力は大きくなっている。また、分離後のシースの状態も実施例の９０℃の温水に２４時間浸漬したものがもっとも良好となっている。
【００１９】
【発明の効果】
以上説明したように、本発明のケーブルの解体方法によれば、遮水層が接着されたシースを湿熱処理することにより、容易にシースと遮水層を分離することができる。特に温水に浸漬した後では温水から取り出して放置し、室温程度の温度になった後でも、シースと遮水層の接着力は低下した状態が維持され効果が大きい。また、分離後のシースには接着剤などが残らず、洗浄・乾燥すれば再生材料として使用することが可能である。
【図面の簡単な説明】
【図１】遮水層を用いたケーブルの断面図。
【符号の説明】
１ 導体
２ 内部半導電層
３ 絶縁体
４ 外部半導電層
５ 金属遮蔽層
６ 遮水層
７ シース[0001]
[Industrial application fields]
The present invention relates to a method for disassembling a cable having a water shielding layer.
[0002]
[Prior art]
For example, in a power cable, an inner semiconductive layer, an insulator made of cross-linked polyethylene, an outer semiconductive layer, and a sheath such as polyvinyl chloride or polyethylene are sequentially coated on a conductor, but penetrates from the outside. In order to block moisture, a water shielding layer in which polyethylene tape or the like is laminated on one or both surfaces of a metal foil such as lead or aluminum is provided between the outer semiconductive layer and the sheath.
[0003]
By the way, in recent years, environmental considerations have been taken such as that no harmful substances such as lead compounds and chlorine gas are eluted or generated during disposal of landfills and incineration of wires and cables, and that recycling is easy after dismantling. Is required. As for the material of the water shielding layer, as with other members of electric wires and cables, non-lead and recyclability have been studied, and aluminum has been applied from lead that has been used conventionally.
[0004]
In general, the water-blocking layer is often bonded to the cable sheath with a polyolefin-based adhesive, and it is difficult to separate once bonded, so many sheaths with a water-blocking layer are water-blocking. It was the present situation that it was landfilled as industrial waste with the layers still adhered. In general, the life of CV cables is said to be about 30 years, and since 20 years have passed since the use of water shielding layers for CV cables, these water shielding layers were used in the future. It is expected that cables will be removed and the amount of waste disposal will increase, most of which will be water-impervious layers using lead.
[0005]
Conventionally, in order to separate the sheath and the water-impervious layer, methods such as heating to about 100 ° C. to 150 ° C. to dissolve the adhesive and separating the adhesive, and pressurizing and separating at a high temperature have been performed. (For example, refer to Patent Document 1).
[0006]
[Patent Document 1]
JP 2000-113738 A (paragraph numbers “0012” to “0017”, FIG. 1)
[0007]
[Problems to be solved by the invention]
However, in the method for separating the sheath and the water shielding layer as described above, there is a problem that the adhesive is solidified again by being cooled while being left standing after heating, making separation difficult. In addition, since the adhesive material for the water shielding layer remains in the sheath after separation, there is a problem in that mechanical properties, water absorption, and workability deteriorate when the sheath is regenerated.
[0008]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for easily separating a sheath and a water shielding layer when a cable having a water shielding layer bonded to a sheath is disassembled. To do.
[0009]
[Means for Solving the Problems]
The present inventors examined a method for solving the above problems, and found that the sheath and the water shielding layer can be easily separated by wet-heat-treating the sheath portion in a state where the water shielding layer is bonded, The present invention has been achieved.
[0010]
That is, in order to solve the above-mentioned problem, the cable disassembly method according to claim 1 is the disassembly of the cable in which the water shielding layer coated on the conductor and the sheath made of polyvinyl chloride are bonded with an adhesive. In the method, when separating the water shielding layer from the sheath, the sheath and the water shielding layer are separated by being immersed in warm water at 90 ° C. for 24 hours.
[0011]
A cable disassembling method according to claim 2 is characterized in that, in claim 1, the adhesive is a polyolefin adhesive or a polyester adhesive.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below. FIG. 1 shows a cross section of a power cable using a water shielding layer. A conductor 1, an inner semiconductive layer 2, an
[0013]
After such a cable is removed, the conductor is pulled out and disassembled, and portions other than the conductor are cut into an appropriate size and shape. According to the method for separating a water shielding layer of the present invention, the sheath and the water shielding layer can be easily separated by wet heat-treating the sheath portion in which the water shielding layer of the disassembled cable is bonded. it can. Here, the wet heat treatment refers to a treatment in a state where the sample is exposed to a high-temperature humidity environment and a treatment in a state where the sample is immersed in warm water. In addition, when exposing a sample in a high-temperature humidity environment, water vapor may be sprayed on the sample at a high temperature. In the cable disassembling method of the present invention, as described later, the effect is particularly great when immersed in warm water. The temperature range of the wet heat treatment is preferably 60 ° C. or higher, and the separation effect is reduced at temperatures lower than 60 ° C.
[0014]
The water quality is not particularly limited, but seawater, surfactant water, acidic water, alkaline water and the like can be used in addition to general tap water. When the sheath is polyvinyl chloride, water quality containing hydrochloric acid is effective.
[0015]
In this way, after being immersed in warm water, it is taken out from the warm water and left to stand, and even after the temperature reaches about room temperature, the state in which the adhesive force between the sheath and the water shielding layer is reduced is maintained, and the sheath and the water The layers can be separated. Further, no adhesive remains in the sheath after separation, and the characteristics of the recycled material are hardly deteriorated if washed and dried.
[0016]
【Example】
Using a 77 kV 80 mm 2 CV cable with a polyvinyl chloride sheath with a water shielding layer, and using a test piece with a length of 15 cm by dividing the sheath to which the water shielding layer was bonded into a semicircle, under the conditions in Table 1, the sheath The workability, separation force, and state of the sheath after separation were evaluated. The water shielding layer is a 0.5 mm thick lead foil laminated on one side with a 0.05 mm thick polyethylene terephthalate laminate as a reinforcing layer, and the other side with a 0.1 mm thick semiconductive resin laminated tape. A hot melt type adhesive having a polyethylene terephthalate laminate surface side thermally fused to the sheath and a polyester adhesive having a polyethylene terephthalate laminate surface side thermally fused to the sheath were used. Evaluation was performed by the following method.
“Workability”: Ease of peeling when an impermeable layer was peeled for an appropriate length was evaluated.
“Peeling force”: The water shielding material peeled off from the test piece for an appropriate length is set in the lower grip part of the tensile tester, and the other part is set in the upper grip, and the peeling force is measured at an angle of 180 ° and a peeling speed of 100 mm / min. did.
“Sheath state after separation”: The state of the adhesive remaining on the sheath surface after the separation of the water shielding layer was visually evaluated.
[0017]
[Table 1]
As shown in Table 1, after being immersed in warm water at 90 ° C. for 24 hours, the workability is good and the peeling force is the smallest, whereas in the conventional method after heating in an atmosphere of 90 ° C. and 8% humidity for 24 hours, The workability is poor and the peel force is large. The workability is good after heating at 120 ° C. for 2 atm for 3 hours, but the peel force is large. Moreover, the state of the sheath after separation is most satisfactory when it is immersed in warm water of 90 ° C. for 24 hours.
[0019]
【The invention's effect】
As described above, according to the cable disassembling method of the present invention, the sheath and the water shielding layer can be easily separated by wet-heat-treating the sheath to which the water shielding layer is bonded. In particular, after being immersed in warm water, it is taken out from the warm water and allowed to stand, and even after the temperature reaches about room temperature, the state in which the adhesive force between the sheath and the water-impervious layer is lowered is maintained and the effect is great. Further, no adhesive or the like remains in the separated sheath, and it can be used as a recycled material if it is washed and dried.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a cable using a water shielding layer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Conductor 2 Internal
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003175216A JP4511131B2 (en) | 2002-07-04 | 2003-06-19 | Cable disassembly method |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002196592 | 2002-07-04 | ||
| JP2003175216A JP4511131B2 (en) | 2002-07-04 | 2003-06-19 | Cable disassembly method |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2004087469A JP2004087469A (en) | 2004-03-18 |
| JP2004087469A5 JP2004087469A5 (en) | 2006-09-28 |
| JP4511131B2 true JP4511131B2 (en) | 2010-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003175216A Expired - Lifetime JP4511131B2 (en) | 2002-07-04 | 2003-06-19 | Cable disassembly method |
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| Country | Link |
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| JP (1) | JP4511131B2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0547226A (en) * | 1991-02-22 | 1993-02-26 | Yokohama Rubber Co Ltd:The | Water-barrier tape for power cable |
| JP2000113738A (en) * | 1998-10-06 | 2000-04-21 | Sumitomo Electric Ind Ltd | Power cable and its recycling method |
| JP2000185323A (en) * | 1998-12-22 | 2000-07-04 | Toshiba Corp | Method for separating elastomer from rigid body |
| JP2002010901A (en) * | 2000-06-30 | 2002-01-15 | Sankyo Frontier Co Ltd | Method for recycling carpet, carpet for recycling and recycling system for carpet for recycling |
-
2003
- 2003-06-19 JP JP2003175216A patent/JP4511131B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0547226A (en) * | 1991-02-22 | 1993-02-26 | Yokohama Rubber Co Ltd:The | Water-barrier tape for power cable |
| JP2000113738A (en) * | 1998-10-06 | 2000-04-21 | Sumitomo Electric Ind Ltd | Power cable and its recycling method |
| JP2000185323A (en) * | 1998-12-22 | 2000-07-04 | Toshiba Corp | Method for separating elastomer from rigid body |
| JP2002010901A (en) * | 2000-06-30 | 2002-01-15 | Sankyo Frontier Co Ltd | Method for recycling carpet, carpet for recycling and recycling system for carpet for recycling |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004087469A (en) | 2004-03-18 |
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