JP2021016975A - Separation method of inner surface resin coating layer of metal tube - Google Patents

Separation method of inner surface resin coating layer of metal tube Download PDF

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JP2021016975A
JP2021016975A JP2019133471A JP2019133471A JP2021016975A JP 2021016975 A JP2021016975 A JP 2021016975A JP 2019133471 A JP2019133471 A JP 2019133471A JP 2019133471 A JP2019133471 A JP 2019133471A JP 2021016975 A JP2021016975 A JP 2021016975A
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metal tube
coating layer
resin
resin coating
end side
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JP7289183B2 (en
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修也 長谷川
Shuya Hasegawa
修也 長谷川
盛男 岩本
Morio Iwamoto
盛男 岩本
健太 宮原
Kenta Miyahara
健太 宮原
裕太 白井
Yuta Shirai
裕太 白井
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Dai Ichi High Frequency Co Ltd
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    • 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
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    • Y02W30/62—Plastics recycling; Rubber recycling

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Abstract

To provide a separation method capable of easily separating a resin coating layer formed on an inner surface of a metal tube from the inner surface.SOLUTION: The inside of a metal tube 11 is made a nitrogen atmosphere, and a coil 23 of high frequency induction heating means 20 is so positioned as to surround an upper end part of the metal tube 11 to induction-heat the upper end part of the metal tube 11. After the outer surface temperature of the metal tube 11 in the upper end part exceeds a thermal decomposition temperature of a component resin of a resin coating layer 16, while the induction heating is so continued that the outer surface temperature of the metal tube 11 is maintained at the thermal decomposition temperature or more, the coil 23 is moved to a position surrounding a lower end part of the metal tube 11, thereby the component resin in the vicinity of a boundary surface between the metal tube 11 and the resin coating layer 16 is sequentially and thermally decomposed from the upper end side toward the lower end side of the metal tube 11, and further the component resin in other than the vicinity of the boundary surface is sequentially and thermally melted from the upper end side to the lower end side of the metal tube 11, and the component resin in the melted state is discharged from an opening of the lower end side of the metal tube 11, in a process contained in this invention.SELECTED DRAWING: Figure 1

Description

本発明は、金属管の内面に形成されている樹脂被覆層を、当該内面から分離する方法に関する。 The present invention relates to a method for separating a resin coating layer formed on an inner surface of a metal tube from the inner surface.

例えば、金属管内面に形成されている樹脂被覆層を貼り替える際において、当該樹脂被覆層を剥離する方法として、金属管の一端で樹脂被覆層を剥がして掴み代を作り、金属管内に挿入した把持・牽引手段にその掴み代を連結すると共にその掴み代を反転させ、剥離前線近傍の管体を、誘導加熱手段によって接着強度が一過的に低下するように加熱し、誘導加熱手段を管軸方向に順次移動させて加熱位置を順次移動させながら把持・牽引手段を金属管の他端に向かって引き抜き、樹脂被覆層を反転させながら剥がして行く方法が、本出願人によって紹介されている（下記の特許文献１参照）。 For example, when replacing the resin coating layer formed on the inner surface of the metal tube, as a method of peeling off the resin coating layer, the resin coating layer is peeled off at one end of the metal tube to make a gripping allowance, and the resin coating layer is inserted into the metal tube. The gripping allowance is connected to the gripping / pulling means and the gripping allowance is inverted, and the tubular body near the peeling front is heated by the induction heating means so that the adhesive strength is temporarily reduced, and the induction heating means is tubed. The applicant has introduced a method in which the gripping / pulling means is pulled out toward the other end of the metal tube while sequentially moving in the axial direction and the heating position is sequentially moved, and the resin coating layer is peeled off while being inverted. (See Patent Document 1 below).

しかしながら、特許文献１に記載されているような方法では、剥がされた後の樹脂被覆層は、加熱により軟化して強度が低下しているため、引張力により途中で破断してしまうことがある。 However, in the method described in Patent Document 1, the resin coating layer after being peeled off is softened by heating and its strength is lowered, so that the resin coating layer may be broken in the middle due to the tensile force. ..

また、金属管内面に形成されている樹脂被覆層を剥離する他の方法として、樹脂被覆層の表面を水冷しながら、金属管と樹脂被覆層との界面を当該樹脂被覆層を構成する樹脂の熱分解温度以上の温度で加熱することにより、界面近傍における構成樹脂を熱分解させる第１工程と、金属管の内面から樹脂被覆層を剥離除去する第２工程とを含む方法が、本出願人によって紹介されている（下記の特許文献２参照）。 Further, as another method for peeling off the resin coating layer formed on the inner surface of the metal tube, the surface of the resin coating layer is cooled with water, and the interface between the metal tube and the resin coating layer is formed by the resin constituting the resin coating layer. Applicants apply for a method including a first step of thermally decomposing the constituent resin in the vicinity of the interface by heating at a temperature equal to or higher than the thermal decomposition temperature and a second step of peeling and removing the resin coating layer from the inner surface of the metal tube. (See Patent Document 2 below).

しかしながら、特許文献２に記載されているような方法では、第１工程の終了後、樹脂被覆層が金属管の内面に再固着することがあり、このように再固着した樹脂を、第２工程において剥離することはきわめて困難である。 However, in the method as described in Patent Document 2, the resin coating layer may be re-adhered to the inner surface of the metal tube after the completion of the first step, and the resin reattached in this way may be reattached to the second step. It is extremely difficult to peel off in.

また、小径（例えば、外径が２７．２〜１１４．３ｍｍ）の金属管の内面に形成された樹脂被覆層を手指や治具により剥離することはきわめて困難である。 Further, it is extremely difficult to peel off the resin coating layer formed on the inner surface of a metal tube having a small diameter (for example, an outer diameter of 27.2 to 114.3 mm) with a finger or a jig.

ところで、原子力管理区域内で使用されていた金属管の内面に形成された樹脂被覆層は、その表面が放射性物質などにより汚染されている可能性があるため、そのような汚染物質を樹脂被覆層の表面近傍を構成する樹脂とともに確実に回収することが必要である。 By the way, the surface of the resin coating layer formed on the inner surface of the metal pipe used in the nuclear power control area may be contaminated with radioactive substances, etc., so such contaminants are used as the resin coating layer. It is necessary to reliably recover the resin together with the resin constituting the vicinity of the surface of the above.

特開２０００−２１０９３７号公報Japanese Unexamined Patent Publication No. 2000-210937 特開２０１８−２０２７９７号公報JP-A-2018-202977

本発明は以上のような事情に基いてなされたものである。
本発明の目的は、金属管の内面に形成されている樹脂被覆層を、当該内面から容易かつ確実に分離することができる新規な分離方法を提供することにある。
本発明の他の目的は、界面近傍以外における樹脂被覆層の構成樹脂が、金属管の内面に再固着するようなことがない分離方法を提供することにある。
本発明の更に他の目的は、金属管の内面に形成されている樹脂被覆層を、手指や剥離治具を使用することなく、前記内面から分離することができる分離方法を提供することにある。
本発明の更に他の目的は、樹脂被覆層の表面が放射性物質などによって汚染されている場合に、そのような汚染物質を樹脂被覆層の構成樹脂とともに確実に回収することができる分離方法を提供することにある。 The present invention has been made based on the above circumstances.
An object of the present invention is to provide a novel separation method capable of easily and surely separating a resin coating layer formed on an inner surface of a metal tube from the inner surface.
Another object of the present invention is to provide a separation method in which the constituent resin of the resin coating layer other than the vicinity of the interface does not re-adhere to the inner surface of the metal tube.
Still another object of the present invention is to provide a separation method capable of separating the resin coating layer formed on the inner surface of the metal tube from the inner surface without using fingers or a peeling jig. ..
Still another object of the present invention is to provide a separation method capable of reliably recovering such a contaminant together with a constituent resin of the resin coating layer when the surface of the resin coating layer is contaminated with a radioactive substance or the like. To do.

（１）本発明の分離方法は、金属管の内面に形成されている樹脂被覆層を、前記内面から分離する方法であって、
前記金属管の内部を不活性ガス雰囲気とし、
高周波誘導加熱手段を構成するコイルを、前記金属管の一端部を囲むように位置させて前記金属管の前記一端部を誘導加熱し、
前記一端部における前記金属管の外面温度が前記樹脂被覆層の構成樹脂の熱分解温度を超えた後、
前記コイルの長さ方向の中心と対向する前記金属管の外面温度が前記熱分解温度以上に維持されるよう誘導加熱を継続しながら、前記コイルを、前記金属管の外面に沿って前記金属管の他端部を囲む位置まで移動させることにより、前記金属管と前記樹脂被覆層の界面近傍における前記構成樹脂を前記金属管の一端側から他端側に向けて順次熱分解させるとともに、前記界面近傍以外における前記構成樹脂を前記金属管の一端側から他端側に向けて順次熱溶融させ、溶融状態の前記構成樹脂を前記金属管の他端側の開口から排出する工程を含むことを特徴とする。 (1) The separation method of the present invention is a method of separating the resin coating layer formed on the inner surface of the metal tube from the inner surface.
The inside of the metal tube is made to have an inert gas atmosphere.
A coil constituting the high-frequency induction heating means is positioned so as to surround one end of the metal tube, and the one end of the metal tube is induced and heated.
After the outer surface temperature of the metal tube at one end exceeds the thermal decomposition temperature of the constituent resin of the resin coating layer,
While continuing induction heating so that the outer surface temperature of the metal tube facing the center in the length direction of the coil is maintained above the thermal decomposition temperature, the coil is placed along the outer surface of the metal tube. By moving the resin to a position surrounding the other end of the metal tube, the constituent resin in the vicinity of the interface between the metal tube and the resin coating layer is sequentially thermally decomposed from one end side to the other end side of the metal tube, and the interface is formed. It is characterized by including a step of sequentially heat-melting the constituent resin other than the vicinity from one end side to the other end side of the metal pipe, and discharging the melted constituent resin from the opening on the other end side of the metal pipe. And.

このような分離方法によれば、金属管との界面近傍における樹脂被覆層の構成樹脂が、金属管の一端側から他端側に向けて順次熱分解するとともに、界面近傍以外における樹脂被覆層の構成樹脂が、金属管の一端側から他端側に向けて順次熱溶融し、溶融状態の構成樹脂が金属管内面から分離（剥離）されて他端方向に流動し、他端側の開口から排出されるので、界面近傍以外における樹脂被覆層の構成樹脂が、金属管の内面に再固着するようなことはない。
また、溶融状態の構成樹脂は、手指や剥離治具を使用しなくても金属管内面から容易に分離することができる。 According to such a separation method, the constituent resin of the resin coating layer in the vicinity of the interface with the metal tube is sequentially pyrolyzed from one end side to the other end side of the metal tube, and the resin coating layer in the vicinity other than the interface is formed. The constituent resin is sequentially thermally melted from one end side to the other end side of the metal pipe, and the molten constituent resin is separated (peeled) from the inner surface of the metal pipe and flows in the other end direction, and from the opening on the other end side. Since it is discharged, the constituent resin of the resin coating layer other than the vicinity of the interface does not re-adhere to the inner surface of the metal tube.
Further, the constituent resin in the molten state can be easily separated from the inner surface of the metal tube without using a finger or a peeling jig.

（２）本発明の金属管内面樹脂被覆層の分離方法において、前記金属管の前記一端部が上端部となり前記他端部が下端部となるように、前記金属管を起立または傾斜させることにより、溶融状態の前記構成樹脂を、その自重を利用して、前記金属管の下端側の前記開口から排出することが好ましい。 (2) In the method for separating the resin coating layer on the inner surface of the metal tube of the present invention, the metal tube is erected or tilted so that one end of the metal tube is the upper end and the other end is the lower end. It is preferable that the constituent resin in a molten state is discharged from the opening on the lower end side of the metal tube by utilizing its own weight.

このような分離方法によれば、溶融状態の構成樹脂（界面近傍以外における樹脂被覆層の構成樹脂）を下端方向に流動させて、金属管の下端側開口から容易に排出させることができる。 According to such a separation method, the molten constituent resin (the constituent resin of the resin coating layer other than the vicinity of the interface) can be flowed in the lower end direction and easily discharged from the lower end side opening of the metal tube.

（３）本発明の金属管内面樹脂被覆層の分離方法において、前記金属管の内部を不活性ガス雰囲気とするために、前記金属管の一端側から他端側に向けて管内に不活性ガスを流通させ、この不活性ガスの流れを利用して、溶融状態の前記構成樹脂を前記金属管の他端側の前記開口から排出してもよい。 (3) In the method for separating the resin coating layer on the inner surface of the metal pipe of the present invention, an inert gas is introduced into the metal pipe from one end side to the other end side in order to create an inert gas atmosphere inside the metal pipe. May be circulated and the flow of the inert gas may be utilized to discharge the constituent resin in a molten state from the opening on the other end side of the metal tube.

このような分離方法によっても、溶融状態の構成樹脂を他端方向に流動させ、金属管の他端側開口から容易に排出させることができる。 Even by such a separation method, the constituent resin in the molten state can be flowed in the direction of the other end and easily discharged from the opening on the other end side of the metal tube.

（４）本発明の金属管内面樹脂被覆層の分離方法において、前記樹脂被覆層の構成樹脂がポリエチレンであることが好ましい。 (4) In the method for separating the resin coating layer on the inner surface of the metal tube of the present invention, it is preferable that the constituent resin of the resin coating layer is polyethylene.

（５）本発明の金属管内面樹脂被覆層の分離方法において、金属管の内面に形成されていた樹脂被覆層の８０質量％以上を、前記金属管の他端側の開口から排出させて回収することが好ましい。 (5) In the method for separating the resin coating layer on the inner surface of the metal tube of the present invention, 80% by mass or more of the resin coating layer formed on the inner surface of the metal tube is discharged from the opening on the other end side of the metal tube and recovered. It is preferable to do so.

本発明の分離方法によれば、金属管の内面に形成されている樹脂被覆層を、当該金属管の内面から容易かつ確実に分離することができる。
また、樹脂被覆層の分離作業を手指や剥離治具を使用することなく行うことができる。 また、界面近傍以外における樹脂被覆層の構成樹脂が、金属管の内面に再固着するようなこともない。
更に、樹脂被覆層の表面近傍を構成していた樹脂を、金属管の他端側の開口から排出して確実に回収することができる。この結果、樹脂被覆層の表面が放射性物質などによって汚染されていた場合に、放射性物質などの汚染物質を、排出された樹脂とともに回収することができる。 According to the separation method of the present invention, the resin coating layer formed on the inner surface of the metal tube can be easily and surely separated from the inner surface of the metal tube.
Further, the resin coating layer can be separated without using fingers or a peeling jig. Further, the constituent resin of the resin coating layer other than the vicinity of the interface does not re-adhere to the inner surface of the metal tube.
Further, the resin constituting the vicinity of the surface of the resin coating layer can be discharged from the opening on the other end side of the metal tube and reliably recovered. As a result, when the surface of the resin coating layer is contaminated with a radioactive substance or the like, the pollutant such as the radioactive substance can be recovered together with the discharged resin.

本発明の一実施形態を示す模式図である。It is a schematic diagram which shows one Embodiment of this invention. 本発明の他の実施形態を示す模式図である。It is a schematic diagram which shows the other embodiment of this invention.

以下、本発明について詳細に説明する。
本発明の分離方法は、金属管の内面に形成（ライニング）されている樹脂被覆層を当該内面から分離（剥離）する方法である。 Hereinafter, the present invention will be described in detail.
The separation method of the present invention is a method of separating (peeling) the resin coating layer formed (lining) on the inner surface of the metal tube from the inner surface.

＜第１実施形態＞
図１は、本発明の分離方法の一実施形態を示す一部破断模式図である。
図１において１１は金属管であり、起立した状態で配置されている。
金属管１１の内面には樹脂被覆層１６が形成されている。 <First Embodiment>
FIG. 1 is a partially broken schematic view showing an embodiment of the separation method of the present invention.
In FIG. 1, reference numeral 11 denotes a metal tube, which is arranged in an upright state.
A resin coating layer 16 is formed on the inner surface of the metal tube 11.

金属管１１としては、各種鋼管、銅管などを例示することができる。
金属管１１の外径としては、通常２７．２〜１１４．３ｍｍとされ、好適な一例を示せば６０．５ｍｍ（呼び径５０Ａ）とされる。
金属管１１の肉厚としては、通常２．９〜６．０ｍｍとされ、好適な一例を示せば３．９ｍｍとされる。 Examples of the metal pipe 11 include various steel pipes and copper pipes.
The outer diameter of the metal tube 11 is usually 27.2 to 114.3 mm, and a suitable example is 60.5 mm (nominal diameter 50A).
The wall thickness of the metal tube 11 is usually 2.9 to 6.0 mm, and a suitable example is 3.9 mm.

樹脂被覆層１６を構成する樹脂としては、ポリエチレン、ポリプロピレンなどのポリオレフィン、ポリ塩化ビニル、ポリアミド、フッ素樹脂などの熱可塑性樹脂を例示することができ、本発明の分離方法は、特に、ポリエチレンからなる被覆樹脂層１６の分離方法として好適である。
樹脂被覆層１６の厚さとしては、通常０．５〜３ｍｍとされ、好適な一例を示せば２ｍｍとされる。 Examples of the resin constituting the resin coating layer 16 include polyolefins such as polyethylene and polypropylene, and thermoplastic resins such as polyvinyl chloride, polyamide and fluororesin, and the separation method of the present invention is particularly made of polyethylene. It is suitable as a method for separating the coating resin layer 16.
The thickness of the resin coating layer 16 is usually 0.5 to 3 mm, and a suitable example is 2 mm.

本実施形態の分離方法は、高周波誘導加熱装置２０と、不活性ガス供給手段３０と、集塵装置４０と、回収容器５０とを使用して実施される。 The separation method of the present embodiment is carried out using the high frequency induction heating device 20, the inert gas supply means 30, the dust collector 40, and the recovery container 50.

高周波誘導加熱装置２０は、高周波電源２１と、金属管１１の外面を囲むようにして、移動（昇降）することができるコイル２３を備えている。 The high-frequency induction heating device 20 includes a high-frequency power supply 21 and a coil 23 that can move (elevate) so as to surround the outer surface of the metal tube 11.

不活性ガス供給手段３０は、金属管１１の内部に不活性ガスを供給するために、金属管１１の上端側に接続されている。
ここに、不活性ガスとしては、誘導加熱時における樹脂の発火を防止できるガスであればよく、窒素ガスを好適に使用することができる。 The inert gas supply means 30 is connected to the upper end side of the metal pipe 11 in order to supply the inert gas to the inside of the metal pipe 11.
Here, the inert gas may be any gas that can prevent the resin from igniting during induction heating, and nitrogen gas can be preferably used.

集塵装置４０は、不完全燃焼に伴う黒煙などを吸引して回収するために、金属管１１の下端側に接続されている。 The dust collector 40 is connected to the lower end side of the metal pipe 11 in order to suck and collect black smoke or the like due to incomplete combustion.

この実施形態の分離方法では、先ず、不活性ガス供給手段３０からの不活性ガスを供給して、金属管１１の内部を不活性ガス雰囲気とする。
その後、図１（Ａ）に示すように、高周波誘導加熱装置２０を構成するコイル２３を、金属管１１の上端部の外面を囲むように位置させて、金属管１１の上端部を誘導加熱する。
誘導加熱により、金属管１１の上端部における外面温度が樹脂被覆層１６の構成樹脂の熱分解温度を超えた後、コイル２３を、金属管１１の下端方向へ移動（下降）させる。 In the separation method of this embodiment, first, the inert gas from the inert gas supply means 30 is supplied to create an inert gas atmosphere inside the metal tube 11.
After that, as shown in FIG. 1A, the coil 23 constituting the high frequency induction heating device 20 is positioned so as to surround the outer surface of the upper end portion of the metal tube 11, and the upper end portion of the metal tube 11 is induced and heated. ..
After the outer surface temperature at the upper end of the metal tube 11 exceeds the thermal decomposition temperature of the constituent resin of the resin coating layer 16 by induction heating, the coil 23 is moved (lowered) toward the lower end of the metal tube 11.

ここに、構成樹脂の熱分解温度とは、窒素雰囲気下で熱分析（ＴＧ／ＤＴＡ）を行った場合に当該樹脂の重量が５％減少したときの温度をいい、ポリエチレン樹脂の熱分解温度は４００〜４５０℃とされる。
また、金属管１１の外面温度は、例えば、放射温度計、サーモテープ、接触温度計などにより測定することができる。 Here, the thermal decomposition temperature of the constituent resin means the temperature when the weight of the resin is reduced by 5% when the thermal analysis (TG / DTA) is performed in a nitrogen atmosphere, and the thermal decomposition temperature of the polyethylene resin is It is set to 400 to 450 ° C.
Further, the outer surface temperature of the metal tube 11 can be measured by, for example, a radiation thermometer, a thermotape, a contact thermometer, or the like.

高周波誘導加熱装置２０による誘導加熱において、周波数としては２〜３０ｋＨｚであることが好ましく、好適な一例を示せば２０ｋＨｚである。
また、投入電力としては５〜１２０ｋＷであることが好ましく、好適な一例を示せば１０ｋＷである。
金属管１１の上端部における外面の昇温速度は１℃／秒以上であることが好ましく、好適な一例を示せば１０℃／秒とされる。 In the induction heating by the high frequency induction heating device 20, the frequency is preferably 2 to 30 kHz, and a suitable example is 20 kHz.
The input power is preferably 5 to 120 kW, and a suitable example is 10 kW.
The rate of temperature rise of the outer surface at the upper end of the metal tube 11 is preferably 1 ° C./sec or more, and a suitable example is 10 ° C./sec.

金属管１１の上端部の誘導加熱を開始してからコイル２３の下降を開始するまでの時間（定置加熱時間）としては、通常１〜６０秒間とされ、好適な一例を示せば８秒間である。 The time (stationary heating time) from the start of induction heating of the upper end of the metal tube 11 to the start of descent of the coil 23 is usually 1 to 60 seconds, and a suitable example is 8 seconds. ..

定置加熱時間が短過ぎると、金属管１１の上端部に供給する熱量が不足して、その外面を十分に昇温させることができず、金属管１１との界面近傍における樹脂被覆層１６の構成樹脂を十分に熱分解できなくなることがあり、かかる場合には、金属管１１の上端部において樹脂被覆層１６の分離が困難となる。 If the stationary heating time is too short, the amount of heat supplied to the upper end of the metal tube 11 is insufficient, and the temperature of the outer surface thereof cannot be sufficiently raised, so that the structure of the resin coating layer 16 near the interface with the metal tube 11 is formed. The resin may not be sufficiently thermally decomposed, and in such a case, it becomes difficult to separate the resin coating layer 16 at the upper end of the metal tube 11.

他方、定置加熱時間が長すぎると、金属管１１の上端部に供給する熱量が過剰となって、その外面温度が過大となり、界面近傍以外における樹脂被覆層１６の構成樹脂まで熱分解されることがあり、かかる場合には、金属管１１の上端部に形成されている樹脂被覆層１６の構成樹脂を十分に回収することができない。 On the other hand, if the stationary heating time is too long, the amount of heat supplied to the upper end of the metal tube 11 becomes excessive, the outer surface temperature thereof becomes excessive, and the constituent resin of the resin coating layer 16 other than the vicinity of the interface is thermally decomposed. In such a case, the constituent resin of the resin coating layer 16 formed at the upper end of the metal tube 11 cannot be sufficiently recovered.

定置加熱時間の経過後、コイル２３を、その長さ方向の中心と対向している金属管１１の外面温度が、構成樹脂の熱分解温度以上に維持されるように誘導加熱を継続しながら、金属管１１の外面に沿って、図１（Ｂ）に示すような、金属管１１の下端部の外面を囲む位置まで移動（下降）させる。 After the elapse of the stationary heating time, the coil 23 is continuously induced and heated so that the outer surface temperature of the metal tube 11 facing the center in the length direction is maintained above the thermal decomposition temperature of the constituent resin. Along the outer surface of the metal tube 11, the metal tube 11 is moved (lowered) to a position surrounding the outer surface of the lower end portion of the metal tube 11 as shown in FIG. 1 (B).

コイル２３の長さ方向の中心と対向している金属管１１の外面温度は、投入電力およびコイル２３の移動速度（コイル送り速度）を適宜調整することにより制御する（構成樹脂の熱分解温度以上に維持する）ことができる。 The outer surface temperature of the metal tube 11 facing the center in the length direction of the coil 23 is controlled by appropriately adjusting the input power and the moving speed (coil feed speed) of the coil 23 (more than the thermal decomposition temperature of the constituent resin). Can be maintained).

ここに、コイル２３の移動速度（コイル送り速度）としては、投入電力によっても異なるが、１〜３０ｍｍ／秒であることが好ましく、好適な一例を示せば３ｍｍ／秒とされる。 Here, the moving speed (coil feed speed) of the coil 23 varies depending on the input power, but is preferably 1 to 30 mm / sec, and a preferable example is 3 mm / sec.

コイル送り速度が速すぎると、移動中のコイル２３から金属管１１に供給される熱量が不足して、金属管１１の外面温度を構成樹脂の熱分解温度以上に維持することができず、金属管１１との界面近傍における樹脂被覆層１６の構成樹脂を十分に熱分解できなくなることがあり、かかる場合には、金属管１１の内面からの樹脂被覆層１６の分離が困難となる。 If the coil feed speed is too high, the amount of heat supplied from the moving coil 23 to the metal tube 11 is insufficient, and the outer surface temperature of the metal tube 11 cannot be maintained above the thermal decomposition temperature of the constituent resin, so that the metal The constituent resin of the resin coating layer 16 in the vicinity of the interface with the tube 11 may not be sufficiently thermally decomposed, and in such a case, it becomes difficult to separate the resin coating layer 16 from the inner surface of the metal tube 11.

他方、コイル送り速度が遅すぎると、移動中のコイル２３から金属管１１に供給される熱量が過剰となって、金属管１１の外面温度が過大となり、金属管１１との界面近傍以外における樹脂被覆層１６の構成樹脂まで熱分解されることになり、かかる場合には、樹脂被覆層１６を樹脂として回収する際の効率が低下する。 On the other hand, if the coil feed speed is too slow, the amount of heat supplied from the moving coil 23 to the metal tube 11 becomes excessive, the outer surface temperature of the metal tube 11 becomes excessive, and the resin other than near the interface with the metal tube 11 The constituent resin of the coating layer 16 is also thermally decomposed, and in such a case, the efficiency of recovering the resin coating layer 16 as a resin is lowered.

移動中のコイル２３の長さ方向の中心と対向している金属管１１の外面温度は、樹脂被覆層１６の構成樹脂の熱分解温度以上とされ、好ましくは、構成樹脂の熱分解温度以上であって構成樹脂の熱分解温度＋１００℃以下とされる。 The outer surface temperature of the metal tube 11 facing the center in the length direction of the moving coil 23 is set to be equal to or higher than the thermal decomposition temperature of the constituent resin of the resin coating layer 16, preferably equal to or higher than the thermal decomposition temperature of the constituent resin. Therefore, the thermal decomposition temperature of the constituent resin is + 100 ° C or less.

ここに、金属管１１の肉厚が１５．９ｍｍ程度またはそれ以下であれば、誘導加熱中における金属管１１と樹脂被覆層１６の界面温度は、金属管１１の外面温度と略等しくなるため、そのような金属管１１の外面温度を樹脂被覆層１６の構成樹脂の熱分解温度以上に維持することによって、金属管１１との界面近傍における構成樹脂を熱分解させることができる。 Here, if the wall thickness of the metal tube 11 is about 15.9 mm or less, the interface temperature between the metal tube 11 and the resin coating layer 16 during induction heating is substantially equal to the outer surface temperature of the metal tube 11. By maintaining the outer surface temperature of such a metal tube 11 at or higher than the thermal decomposition temperature of the constituent resin of the resin coating layer 16, the constituent resin in the vicinity of the interface with the metal tube 11 can be thermally decomposed.

他方、樹脂被覆層１６の構成樹脂（例えばポリエチレン）の熱伝導率は、金属管１１の構成金属（例えば鋼管）の熱伝導率と比較して格段に小さいため、金属管１１の外面温度を樹脂被覆層１６の構成樹脂の熱分解温度以上（例えば、熱分解温度＋１００℃程度）としても、金属管１１との界面近傍以外における構成樹脂は、その溶融温度を超えるものの、その熱分解温度以上にはならない。 On the other hand, since the thermal conductivity of the constituent resin (for example, polyethylene) of the resin coating layer 16 is much smaller than the thermal conductivity of the constituent metal (for example, steel tube) of the metal tube 11, the outer surface temperature of the metal tube 11 is set to resin. Even if the temperature of the constituent resin of the coating layer 16 is equal to or higher than the thermal decomposition temperature (for example, about + 100 ° C.), the constituent resin other than the vicinity of the interface with the metal tube 11 exceeds the melting temperature, but is higher than the thermal decomposition temperature. Must not be.

従って、コイル２３の長さ方向の中心と対向する金属管１１の外面温度が、構成樹脂の熱分解温度以上、特に、構成樹脂の熱分解温度以上であって熱分解温度＋１００℃以下に維持されるように誘導加熱を継続しながら、当該コイル２３を下降させることにより、金属管１１との界面近傍における樹脂被覆層１６の構成樹脂が、金属管１１の上端側から下端側に向けて順次熱分解されるとともに、熱分解温度に到達していない界面近傍以外における構成樹脂が、金属管１１の上端側から下端側に向けて順次熱溶融される。
ここに、金属管１１との「界面近傍」における樹脂被覆層１６の構成樹脂とは、例えば樹脂被覆層１６の厚さをｔとするとき、金属管１１との界面から厚さ方向に０．３ｔ以内、好ましくは０．１ｔ以内の範囲に存在する構成樹脂をいう。 Therefore, the outer surface temperature of the metal tube 11 facing the center in the length direction of the coil 23 is maintained at the thermal decomposition temperature of the constituent resin or higher, particularly the thermal decomposition temperature of the constituent resin or higher and the thermal decomposition temperature + 100 ° C. or lower. By lowering the coil 23 while continuing the induced heating as described above, the constituent resin of the resin coating layer 16 in the vicinity of the interface with the metal tube 11 is sequentially heated from the upper end side to the lower end side of the metal tube 11. At the same time as being decomposed, the constituent resins other than those near the interface that have not reached the thermal decomposition temperature are sequentially thermally melted from the upper end side to the lower end side of the metal tube 11.
Here, the constituent resin of the resin coating layer 16 in the “near interface” with the metal tube 11 is, for example, when the thickness of the resin coating layer 16 is t, it is 0 in the thickness direction from the interface with the metal tube 11. It refers to a constituent resin existing in the range of 3 tons or less, preferably 0.1 tons or less.

金属管１１との界面近傍における構成樹脂が順次熱分解されることにより、界面近傍以外における構成樹脂の金属管１１の内面に対する固着強度が消失する。
また、界面近傍以外における構成樹脂が順次熱溶融されることにより、当該構成樹脂は、その自重によって金属管１１の内面を流下し、金属管１１の下端側の開口から排出されて回収容器５０に収容される。
なお、本発明において、界面近傍以外における構成樹脂の全体が流動性を有していれば、界面近傍以外における構成樹脂の一部（例えば、表面近傍における構成樹脂）が熱溶融されていなくてもよい。 By sequentially pyrolyzing the constituent resin in the vicinity of the interface with the metal tube 11, the adhesive strength of the constituent resin in the vicinity of the interface to the inner surface of the metal tube 11 disappears.
Further, as the constituent resins other than the vicinity of the interface are sequentially heat-melted, the constituent resins flow down the inner surface of the metal pipe 11 due to their own weight, and are discharged from the opening on the lower end side of the metal pipe 11 into the recovery container 50. Be housed.
In the present invention, if the entire constituent resin other than the vicinity of the interface has fluidity, even if a part of the constituent resin other than the vicinity of the interface (for example, the constituent resin near the surface) is not thermally melted. Good.

この実施形態の分離方法によれば、金属管１１との界面近傍における樹脂被覆層１６の構成樹脂が金属管１１の上端側から下端側に向けて順次熱分解されるとともに、界面近傍以外における樹脂被覆層１６の構成樹脂が、金属管１１の上端側から下端側に向けて順次熱溶融し、溶融状態の構成樹脂が直ちに流下して開口から排出されるので、手指や剥離治具を使用しなくても、界面近傍以外における樹脂被覆層１６の構成樹脂を、金属管１１の内面から容易かつ確実に分離することができ、当該構成樹脂が再固着することもない。
また、界面近傍以外における樹脂被覆層１６の構成樹脂を確実に回収することができるので、樹脂被覆層１６の表面が放射性物質によって汚染されていた場合には、当該放射性物質を、排出された樹脂とともに確実に回収することができる。 According to the separation method of this embodiment, the constituent resin of the resin coating layer 16 in the vicinity of the interface with the metal tube 11 is sequentially thermally decomposed from the upper end side to the lower end side of the metal tube 11, and the resin other than in the vicinity of the interface is decomposed. The constituent resin of the coating layer 16 is sequentially thermally melted from the upper end side to the lower end side of the metal tube 11, and the constituent resin in the molten state immediately flows down and is discharged from the opening. Therefore, a finger or a peeling jig is used. Even if it is not present, the constituent resin of the resin coating layer 16 other than the vicinity of the interface can be easily and surely separated from the inner surface of the metal tube 11, and the constituent resin does not re-stick.
Further, since the constituent resin of the resin coating layer 16 other than the vicinity of the interface can be reliably recovered, when the surface of the resin coating layer 16 is contaminated with a radioactive substance, the radioactive substance is discharged from the resin. It can be reliably collected together with.

＜第２実施形態＞
図２は、本発明の分離方法の他の実施形態を示す模式図である。
この実施形態では、金属管１１を傾斜させた状態で配置していること以外は上記の実施形態と同様である。
この実施形態のように金属管１１を傾斜させることによっても、溶融状態の構成樹脂を、当該金属管１１の下端側開口から排出することができる。
ここに、傾斜角度（α）としては３０°以上であることが好ましい。
なお、傾斜状態を維持しながら、金属管１１を、その管軸を中心に回転させてもよい。 <Second Embodiment>
FIG. 2 is a schematic view showing another embodiment of the separation method of the present invention.
This embodiment is the same as the above embodiment except that the metal pipe 11 is arranged in an inclined state.
By inclining the metal tube 11 as in this embodiment, the constituent resin in the molten state can be discharged from the lower end side opening of the metal tube 11.
Here, the inclination angle (α) is preferably 30 ° or more.
The metal tube 11 may be rotated around the tube axis while maintaining the inclined state.

また、図示していないが、更に他の実施形態として、金属管１１を水平に載置し、この金属管の一端側に接続されている不活性ガス供給手段３０から供給される不活性ガスの流れを利用して、溶融状態の構成樹脂を、他端方向へ流動させて、金属管１１の他端側開口から排出することもできる。
なお、水平状態を維持しながら、金属管１１を、その管軸を中心に回転させてもよい。 Further, although not shown, as still another embodiment, the inert gas supplied from the inert gas supply means 30 connected to one end side of the metal pipe 11 is placed horizontally. It is also possible to use the flow to flow the molten constituent resin toward the other end and discharge it from the other end side opening of the metal tube 11.
The metal tube 11 may be rotated around the tube axis while maintaining the horizontal state.

外径６０．５ｍｍ（呼び径５０Ａ）、肉厚３．９ｍｍ、長さ３９０ｍｍの鋼管（１１）の内面にポリエチレンからなる膜厚１．７ｍｍ以上の樹脂被覆層（１６）が形成されてなるポリエチレンライニング鋼管について、第１実施形態の方法により、下記条件に従って、鋼管（１１）の内面からの樹脂被覆層（１６）を分離した。分離操作後の鋼管（１１）の内面を観察したところ、樹脂被覆層（１６）は完全に除去されていた。
分離操作前後の（ライニング）鋼管の重量と、回収した樹脂の重量から、樹脂被覆層の構成樹脂の回収率を求めた。 Polyethylene in which a resin coating layer (16) having a thickness of 1.7 mm or more made of polyethylene is formed on the inner surface of a steel pipe (11) having an outer diameter of 60.5 mm (nominal diameter of 50 A), a wall thickness of 3.9 mm, and a length of 390 mm. For the lining steel pipe, the resin coating layer (16) was separated from the inner surface of the steel pipe (11) according to the following conditions according to the method of the first embodiment. When the inner surface of the steel pipe (11) after the separation operation was observed, the resin coating layer (16) was completely removed.
The recovery rate of the constituent resin of the resin coating layer was determined from the weight of the (lining) steel pipe before and after the separation operation and the weight of the recovered resin.

（条件）
・不活性ガス：窒素ガス
・誘導加熱における周波数および投入電力：２０ｋＨｚ、１０ｋＷ
・上端部における定置加熱時間：８秒間
・定置加熱時間経過時の上端部における外面温度：４５０℃
・コイル送り速度：３ｍｍ／秒
・移動中のコイル（２３）の長さ方向の中心と対向している金属管の外面温度：４００〜５００℃ (conditions)
-Inert gas: Nitrogen gas-Frequency and input power for induction heating: 20 kHz, 10 kW
・ Stationary heating time at the upper end: 8 seconds ・ External surface temperature at the upper end after the stationary heating time has elapsed: 450 ° C
-Coil feed rate: 3 mm / sec-Outer surface temperature of the metal tube facing the center of the moving coil (23) in the length direction: 400 to 500 ° C.

（結果）
・分離操作前のライニング鋼管の重量（Ｗ１）：１８０２ｇ
・分離操作後の鋼管の重量（Ｗ２） ：１７０４ｇ
・回収した樹脂の重量（Ｗ３） ： ８８ｇ
・回収率（Ｗ３／（Ｗ１−Ｗ２））×１００ ： ９０％ (result)
-Weight of lining steel pipe before separation operation (W1): 1802 g
-Weight of steel pipe after separation operation (W2): 1704 g
-Weight of recovered resin (W3): 88 g
-Recovery rate (W3 / (W1-W2)) x 100: 90%

上記の結果から、ポリエチレンからなる樹脂被覆層のうち、界面近傍の構成樹脂（１０％）が熱分解され、界面近傍以外の構成樹脂（９０％）を回収できた。 From the above results, of the resin coating layer made of polyethylene, the constituent resin (10%) near the interface was thermally decomposed, and the constituent resin (90%) other than near the interface could be recovered.

１１ 金属管
１６ 樹脂被覆層
２０ 高周波誘導加熱装置
２１ 高周波電源
２３ コイル
３０ 不活性ガス供給手段
４０ 集塵装置
５０ 回収容器 11 Metal tube 16 Resin coating layer 20 High frequency induction heating device 21 High frequency power supply 23 Coil 30 Inert gas supply means 40 Dust collector 50 Recovery container

Claims (5)

金属管の内面に形成されている樹脂被覆層を前記内面から分離する方法であって、
前記金属管の内部を不活性ガス雰囲気とし、
高周波誘導加熱手段を構成するコイルを、前記金属管の一端部を囲むように位置させて前記金属管の前記一端部を誘導加熱し、
前記一端部における前記金属管の外面温度が前記樹脂被覆層の構成樹脂の熱分解温度を超えた後、
前記コイルの長さ方向の中心と対向する前記金属管の外面温度が前記熱分解温度以上に維持されるよう誘導加熱を継続しながら、前記金属管の他端部を囲む位置まで前記コイルを移動させることにより、前記金属管と前記樹脂被覆層の界面近傍における前記構成樹脂を前記金属管の一端側から他端側に向けて順次熱分解させるとともに、前記界面近傍以外における前記構成樹脂を前記金属管の一端側から他端側に向けて順次熱溶融させ、溶融状態の前記構成樹脂を前記金属管の他端側の開口から排出する工程を含むことを特徴とする金属管内面樹脂被覆層の分離方法。 A method of separating the resin coating layer formed on the inner surface of the metal tube from the inner surface.
The inside of the metal tube is made to have an inert gas atmosphere.
A coil constituting the high-frequency induction heating means is positioned so as to surround one end of the metal tube, and the one end of the metal tube is induced and heated.
After the outer surface temperature of the metal tube at one end exceeds the thermal decomposition temperature of the constituent resin of the resin coating layer,
The coil is moved to a position surrounding the other end of the metal tube while continuing induction heating so that the outer surface temperature of the metal tube facing the center in the length direction of the coil is maintained at the thermal decomposition temperature or higher. By doing so, the constituent resin in the vicinity of the interface between the metal tube and the resin coating layer is sequentially pyrolyzed from one end side to the other end side of the metal tube, and the constituent resin other than in the vicinity of the interface is pyrolyzed. A resin coating layer on the inner surface of a metal pipe, which comprises a step of sequentially thermally melting the resin from one end side to the other end side of the pipe and discharging the molten resin from the opening on the other end side of the metal pipe. Separation method. 前記金属管の前記一端部が上端部となり前記他端部が下端部となるように、前記金属管を起立または傾斜させることにより、溶融状態の前記構成樹脂を、その自重を利用して、前記金属管の下端側の前記開口から排出することを特徴とする請求項１に記載の金属管内面樹脂被覆層の分離方法。 By erecting or inclining the metal tube so that one end of the metal tube becomes the upper end and the other end becomes the lower end, the constituent resin in a molten state is produced by utilizing its own weight. The method for separating a resin coating layer on the inner surface of a metal tube according to claim 1, wherein the resin is discharged from the opening on the lower end side of the metal tube. 前記金属管の内部を不活性ガス雰囲気とするために、前記金属管の一端側から他端側に向けて管内に不活性ガスを流通させ、この不活性ガスの流れを利用して、溶融状態の前記構成樹脂を前記金属管の他端側の前記開口から排出することを特徴とする請求項１または２に記載の金属管内面樹脂被覆層の分離方法。 In order to create an inert gas atmosphere inside the metal pipe, an inert gas is circulated in the pipe from one end side to the other end side of the metal pipe, and the flow of the inert gas is used to form a molten state. The method for separating the inner surface resin coating layer of a metal pipe according to claim 1 or 2, wherein the constituent resin of the above is discharged from the opening on the other end side of the metal pipe. 前記樹脂被覆層の構成樹脂がポリエチレンであることを特徴とする請求項１〜３の何れかに記載の金属管内面樹脂被覆層の分離方法。 The method for separating a metal tube inner surface resin coating layer according to any one of claims 1 to 3, wherein the constituent resin of the resin coating layer is polyethylene. 金属管の内面に形成されていた樹脂被覆層の８０質量％以上を、前記金属管の他端側の開口から排出させて回収することを特徴とする請求項１〜４の何れかに記載の金属管内面樹脂被覆層の分離方法。 The invention according to any one of claims 1 to 4, wherein 80% by mass or more of the resin coating layer formed on the inner surface of the metal tube is discharged from the opening on the other end side of the metal tube and recovered. A method for separating the resin coating layer on the inner surface of a metal tube.
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* Cited by examiner, † Cited by third party
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JPH07214557A (en) * 1994-02-03 1995-08-15 Yazaki Kako Kk Separately recovering method for steel tube and covering resin of resin-covered steel tube
JPH11919A (en) * 1997-06-11 1999-01-06 Sekisui Chem Co Ltd Separating method of resin-covered metal pipe
JP2000210937A (en) * 1999-01-20 2000-08-02 Dai Ichi High Frequency Co Ltd Method for separation of resin coating on metallic tube inner face
JP2001113531A (en) * 1999-10-19 2001-04-24 Dai Ichi High Frequency Co Ltd Method for sorting resin coating on inner surface of metal pipe
JP2001191330A (en) * 1999-06-28 2001-07-17 Sekisui Chem Co Ltd Method for separating resin from resin-lined steel pipe, method for recycling, and recycled resin material
JP2018202797A (en) * 2017-06-08 2018-12-27 第一高周波工業株式会社 Peeling method of metal pipe inner surface resin coating layer

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Publication number Priority date Publication date Assignee Title
JPH07214557A (en) * 1994-02-03 1995-08-15 Yazaki Kako Kk Separately recovering method for steel tube and covering resin of resin-covered steel tube
JPH11919A (en) * 1997-06-11 1999-01-06 Sekisui Chem Co Ltd Separating method of resin-covered metal pipe
JP2000210937A (en) * 1999-01-20 2000-08-02 Dai Ichi High Frequency Co Ltd Method for separation of resin coating on metallic tube inner face
JP2001191330A (en) * 1999-06-28 2001-07-17 Sekisui Chem Co Ltd Method for separating resin from resin-lined steel pipe, method for recycling, and recycled resin material
JP2001113531A (en) * 1999-10-19 2001-04-24 Dai Ichi High Frequency Co Ltd Method for sorting resin coating on inner surface of metal pipe
JP2018202797A (en) * 2017-06-08 2018-12-27 第一高周波工業株式会社 Peeling method of metal pipe inner surface resin coating layer

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