JP3152746B2 - Synthetic resin lining tube - Google Patents
Synthetic resin lining tubeInfo
- Publication number
- JP3152746B2 JP3152746B2 JP15214892A JP15214892A JP3152746B2 JP 3152746 B2 JP3152746 B2 JP 3152746B2 JP 15214892 A JP15214892 A JP 15214892A JP 15214892 A JP15214892 A JP 15214892A JP 3152746 B2 JP3152746 B2 JP 3152746B2
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- tube
- pipe
- layer
- resin layer
- 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 - Fee Related
Links
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
- Laminated Bodies (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は、主として給水、給湯、
空調、排水等に用いられる、金属管の内周面が合成樹脂
管でライニングされた合成樹脂ライニング管に関する。BACKGROUND OF THE INVENTION The present invention mainly relates to water supply, hot water supply,
The present invention relates to a synthetic resin lining pipe used for air conditioning, drainage, and the like, in which an inner peripheral surface of a metal pipe is lined with a synthetic resin pipe.
【０００２】[0002]
【従来の技術】鋼管等の金属管の耐蝕性等を向上させる
目的で、その内周面を塩化ビニル管等の合成樹脂管でラ
イニングした、いわゆる合成樹脂ライニング管として
は、図３に管の半径方向に切断した部分断面図を示すよ
うに、金属管１００の内周面に接着剤層３００によって
合成樹脂管２００を接着した構造のものが広く用いられ
ている。2. Description of the Related Art A so-called synthetic resin-lined pipe whose inner peripheral surface is lined with a synthetic resin pipe such as a vinyl chloride pipe for the purpose of improving the corrosion resistance of a metal pipe such as a steel pipe is shown in FIG. As shown in a partial cross-sectional view cut in the radial direction, a structure in which a synthetic resin tube 200 is bonded to an inner peripheral surface of a metal tube 100 by an adhesive layer 300 is widely used.
【０００３】このような合成樹脂ライニング管では、金
属管１００と合成樹脂管２００との線膨張係数の差が大
きいために、ライニング管内に高温流体を断続的に流し
たとき、金属管１００と合成樹脂管２００との間に相対
的な伸縮が繰り返され、これによって接着剤層３００に
は繰り返し応力が作用して、合成樹脂管２００が剥離し
たり、あるいは軸方向に収縮してしまう等の問題があっ
た。[0003] In such a synthetic resin lining tube, since the difference in linear expansion coefficient between the metal tube 100 and the synthetic resin tube 200 is large, when a high-temperature fluid flows intermittently through the lining tube, the synthetic resin lining tube and the synthetic resin tube 200 are combined. Relative expansion and contraction between the resin tube 200 and the resin tube 200 are repeated, thereby repeatedly applying stress to the adhesive layer 300, and the synthetic resin tube 200 peels off or shrinks in the axial direction. was there.
【０００４】このような問題を解決するため、従来、合
成樹脂管内に無機充填材を添加することにより、合成樹
脂管の線膨張係数を抑制したり（特開昭５５−１６１６
３９号）、あるいは、合成樹脂管として、熱可塑性樹脂
からなる内層と、補強繊維を含む熱可塑性樹脂からなる
外層とが相互に熱融着により一体化されたものを用いる
ことにより、合成樹脂管の線膨張係数を抑制する（特願
平３−２５０６３８号）、等の対策が提案されている。In order to solve such a problem, conventionally, an inorganic filler is added to a synthetic resin tube to suppress the linear expansion coefficient of the synthetic resin tube (Japanese Patent Laid-Open No. 55-1616).
No. 39) or a synthetic resin tube in which an inner layer made of a thermoplastic resin and an outer layer made of a thermoplastic resin containing reinforcing fibers are integrated with each other by heat fusion. (For example, Japanese Patent Application No. 3-250638) have been proposed.
【０００５】[0005]
【発明が解決しようとする課題】以上のような従来の対
策のうち、特開昭５５−１６１６３９号に基づくもので
は、被搬送流体と接するライニング管の最内層が、無機
ないしは金属系充填材を多量に含んだ合成樹脂で形成さ
れているため、特に熱湯／冷水が繰り返し流される条件
下で使われた場合、ライニング管への水分の浸透と、充
填材の溶出等の恐れがある。Among the conventional measures described above, according to Japanese Patent Application Laid-Open No. 55-161639, the innermost layer of the lining pipe in contact with the fluid to be conveyed contains an inorganic or metallic filler. Since it is formed of a synthetic resin containing a large amount of water, there is a risk that water may penetrate into the lining tube and the filler may be eluted, especially when used under conditions where hot / cold water is repeatedly flowed.
【０００６】一方、特願平３−２５０６３８号に基づく
ものでは、ライニング管の最内層が充填材を含まない通
常に使用される樹脂によって形成されているため、上記
のような恐れはないものの、外層にのみ繊維補強を施し
た合成樹脂管を成形する工程が複雑であり、コストも高
くなるという欠点がある。On the other hand, according to Japanese Patent Application No. Hei 3-250638, since the innermost layer of the lining tube is formed of a commonly used resin containing no filler, there is no fear as described above. There is a drawback that the process of molding a synthetic resin tube in which only the outer layer is fiber-reinforced is complicated, and the cost is high.
【０００７】本発明はこのような実情に鑑みてなされた
もので、被搬送流体の浸透等の恐れがなく、かつ、簡単
な工程のもとに安価に製造でき、しかも熱湯／冷水が繰
り返し流されるような使用条件下においてもライニング
層の破壊が生じにくく、長期にわたって使用可能な耐久
性に優れた合成樹脂ライニング管の提供を目的としてい
る。The present invention has been made in view of the above circumstances, has no fear of permeation of a fluid to be conveyed, can be manufactured at a low cost in a simple process, and has a hot and cold water flowing repeatedly. It is an object of the present invention to provide a synthetic resin lining tube which is less likely to break the lining layer even under such use conditions and which can be used for a long time and has excellent durability.
【０００８】[0008]
【課題を解決するための手段】上記の目的を達成するた
めの構成を、実施例図面である図１を参照しつつ説明す
ると、本発明の合成樹脂ライニング管は、金属管１０の
内周面を接着剤層３０を介してライニングする合成樹脂
管２０が、最内層の内側合成樹脂層２１とその外側の外
側合成樹脂層２２を持ち、外側合成樹脂層２２は、金属
管１０と内側合成樹脂層２１の各線膨張係数の略中間の
線膨張係数を有するとともに、内側合成樹脂層２１の厚
さｔ1 と外側樹脂層２２の厚さｔ2 が、それぞれのヤン
グ率Ｅ1とＥ2 に概略反比例するような関係、すなわち
ｔ1:ｔ2 ≒Ｅ2 : Ｅ1 となっていることによって特徴づ
けられる。A structure for achieving the above object will be described with reference to FIG. 1 which is an embodiment drawing. The synthetic resin lining tube of the present invention is an inner peripheral surface of a metal tube 10. A synthetic resin pipe 20 lining an adhesive layer 30 has an innermost inner synthetic resin layer 21 and an outer synthetic resin layer 22 outside the inner synthetic resin layer 21. The outer synthetic resin layer 22 is composed of the metal pipe 10 and the inner synthetic resin layer. which has a coefficient of linear expansion substantially intermediate linear expansion coefficient of the layer 21, the thickness t 1 and the thickness t 2 of the outer resin layer 22 of the inner synthetic resin layer 21 is outlined in each of the Young's modulus E 1 and E 2 It is characterized by a relationship that is inversely proportional, that is, t 1 : t 2 ≒ E 2 : E 1 .
【０００９】[0009]
【作用】被搬送流体に接する最内層の内側合成樹脂層２
１と金属管１０との間に、これらの線膨張係数の略中間
の線膨張係数を持つ外側合成樹脂層２２を介在させるこ
とにより、それぞれ隣接する層間における線膨張係数の
差は、このような中間層（外側合成樹脂層２２）を持た
ない通常の構造のライニング管に比してそれぞれ約１／
２に緩和される。The inner synthetic resin layer of the innermost layer in contact with the fluid to be conveyed 2
By interposing an outer synthetic resin layer 22 having a coefficient of linear expansion approximately intermediate between these and the metal tube 10, the difference between the coefficients of linear expansion between adjacent layers is such that Compared to a lining tube having a normal structure without an intermediate layer (outer synthetic resin layer 22), each is about 1 /
It is relaxed to 2.
【００１０】このような状況下で、内側合成樹脂層２１
と外側合成樹脂層２２の厚さｔ1 とｔ2 を、それぞれの
層のヤング率Ｅ 1 とＥ 2 に概略反比例した関係、すなわ
ちｔ 1 :ｔ 2 ≒Ｅ 2 : Ｅ 1 とすることで、温度変化時にこ
の２層間の線膨張係数の違いにより発生する応力は、上
述の通常の構造のライニング管において金属管と樹脂層
の間に発生する応力の約１／２となり、これに伴って外
側合成樹脂層２２と金属管１０間の間に発生する応力は
同様に約１／２となって、温度変化時に線膨張係数の差
によって発生する力は各層間にほぼ均等に分散される。Under such circumstances, the inner synthetic resin layer 21
And the thicknesses t 1 and t 2 of the outer synthetic resin layer 22 are substantially inversely proportional to the Young's moduli E 1 and E 2 of the respective layers, ie,
By setting t 1 : t 2 ≒ E 2 : E 1 , the stress generated due to the difference in the coefficient of linear expansion between the two layers at the time of temperature change is reduced by the metal pipe and the resin layer in the lining pipe having the above-mentioned ordinary structure. The stress generated between the outer synthetic resin layer 22 and the metal tube 10 is also approximately ２ of the stress generated between the outer synthetic resin layer 22 and the metal tube 10. The forces generated by the differences are distributed approximately evenly between the layers.
【００１１】[0011]
【実施例】図１は本発明実施例の構造を示す図で、管の
半径方向に沿う面で切断した部分断面図である。FIG. 1 is a view showing the structure of an embodiment of the present invention, and is a partial sectional view cut along a surface along a radial direction of a pipe.
【００１２】金属管１０の内周面に、内側合成樹脂層２
１と外側合成樹脂層２２からなる２層構造の合成樹脂管
２０が接着剤層３０によって相互に接合されている。内
側合成樹脂層２１は当該ライニング管の最内周に位置し
て被搬送流体と接して管の防蝕機能を発揮させるための
層であって、外側合成樹脂層２２は、この内側合成樹脂
層２１と金属管１０の中間に位置して加熱または冷却時
にこれらの線膨張係数の差に基づいて発生する応力を緩
和させることを目的とする層である。すなわち、この外
側合成樹脂層２２は、その線膨張係数が金属管１０と内
側合成樹脂層２１の線膨張係数のほぼ中間の値で、ま
た、その厚さｔ2 は、この外側合成樹脂層２２のヤング
率をＥ2 とし、内側合成樹脂層２１のヤング率をＥ1 と
したとき、内側合成樹脂層２１の厚さｔ1 との関係が、 ｔ1:ｔ2 ≒Ｅ2:Ｅ1 を満足するように設定されている。An inner synthetic resin layer 2 is formed on the inner peripheral surface of the metal tube 10.
A two-layer synthetic resin tube 20 composed of a plastic tube 1 and an outer synthetic resin layer 22 is joined to each other by an adhesive layer 30. The inner synthetic resin layer 21 is located on the innermost periphery of the lining pipe and is a layer for bringing into contact with the fluid to be conveyed and exerting the corrosion protection function of the pipe. The outer synthetic resin layer 22 is formed of the inner synthetic resin layer 21. This layer is located at the middle of the metal tube 10 and is intended to reduce the stress generated based on the difference between these linear expansion coefficients during heating or cooling. That is, the outer synthetic resin layer 22 has a coefficient of linear expansion approximately in the middle of the linear expansion coefficient of the metal tube 10 and the inner synthetic resin layer 21, and the thickness t 2 of the outer synthetic resin layer 22. the Young's modulus and E 2, when the Young's modulus of the inner synthetic resin layer 21 and E 1, the relationship between the thickness t 1 of the inner synthetic resin layer 21 is, t 1: t 2 ≒ E 2: the E 1 It is set to be satisfactory.
【００１３】このような構造のライニング管において、
金属管１０としては鋼管が一般的であるが、水道用メッ
キ鋼管、銅管、あるいはアルミ管を用いることもでき
る。また、内側合成樹脂層２１の材質としては、ライニ
ング管において内面防蝕用として広く用いられている塩
化ビニル管が一般的であるが、塩素化塩化ビニル、ポリ
エチレン、ポリブテン等を採用することもできる。In the lining pipe having such a structure,
As the metal pipe 10, a steel pipe is generally used, but a plated steel pipe for water service, a copper pipe, or an aluminum pipe can also be used. As a material of the inner synthetic resin layer 21, a vinyl chloride pipe widely used for inner corrosion prevention in a lining pipe is generally used, but chlorinated vinyl chloride, polyethylene, polybutene, or the like can also be used.
【００１４】そして、外側合成樹脂層２２の材質として
は、金属管１０と内側合成樹脂層２１の線膨張係数の略
中間の線膨張係数を持つ材質、すなわち、金属は一般に
合成樹脂に対して線膨張係数が１桁程度小さいので、実
質的には、内側合成樹脂層２１と異なる材質で線膨張係
数がその約１／２のものを使用するか、あるいは、内側
合成樹脂層２１と同じ材質の樹脂内に炭酸カルシウム、
タルク、カオリン等の無機充填材を混練し、線膨張係数
を約１／２にしたものでもよい。The material of the outer synthetic resin layer 22 is a material having a linear expansion coefficient substantially in the middle of the linear expansion coefficient of the metal tube 10 and the inner synthetic resin layer 21, that is, the metal is generally linear with respect to the synthetic resin. Since the coefficient of expansion is smaller by about one digit, a material different from that of the inner synthetic resin layer 21 and having a linear expansion coefficient of about 1/2 of that of the inner synthetic resin layer 21 is used, or a material of the same material as the inner synthetic resin layer 21 is used. Calcium carbonate in resin,
An inorganic filler such as talc or kaolin may be kneaded to reduce the linear expansion coefficient to about 1/2.
【００１５】このような内側合成樹脂層２１と外側合成
樹脂層２２を持つ２層構造の合成樹脂管２０は、２層押
出成形等により図１のように一体成形したものを用いて
もよいし、個別に成形して両者を接着剤で接着してもよ
い。The two-layered synthetic resin tube 20 having the inner synthetic resin layer 21 and the outer synthetic resin layer 22 may be integrally formed as shown in FIG. 1 by two-layer extrusion or the like. Alternatively, they may be individually formed and both bonded with an adhesive.
【００１６】また、接着剤層３０の材質としては、通常
のゴム系接着剤のほか、ホットメルト系接着剤や反応性
接着剤等を用いることもできる。金属管１０と２層合成
樹脂管２０とを接着剤層３０を介して接合するための成
形方法としては、金属管１０および合成樹脂管２０の少
なくともいずれか一方に接着剤を塗布した後、合成樹脂
管２０を金属管１０内に挿入し、金属管１０を縮径成形
するか、あるいは合成樹脂管を加熱膨張させる方法のい
ずれをもちいていもよい。As the material of the adhesive layer 30, a hot-melt adhesive, a reactive adhesive or the like can be used in addition to a normal rubber-based adhesive. As a molding method for joining the metal tube 10 and the two-layer synthetic resin tube 20 via the adhesive layer 30, an adhesive is applied to at least one of the metal tube 10 and the synthetic resin tube 20, The method of inserting the resin tube 20 into the metal tube 10 and reducing the diameter of the metal tube 10 or the method of heating and expanding the synthetic resin tube may be used.
【００１７】次に、本発明を適用して実際に合成樹脂ラ
イニング管を製造した例を、比較例とともに具体的に述
べる。 （実施例）外径２８．２ｍｍ、肉厚２．６ｍｍの鋼管の
内周面に、ゴム系接着剤を３０μｍの厚さで塗布し、３
時間乾燥させた。Next, an example in which a synthetic resin lining tube is actually manufactured by applying the present invention will be specifically described together with a comparative example. (Example) A rubber-based adhesive was applied to the inner peripheral surface of a steel pipe having an outer diameter of 28.2 mm and a wall thickness of 2.6 mm to a thickness of 30 μm, and
Let dry for hours.
【００１８】内側層と外側層を持つ２層構造の塩化ビニ
ル製の合成樹脂管の外周面に、同じくゴム系接着剤を５
μｍの厚さで塗布し、同様に３時間乾燥させた。この２
層構造の塩化ビニル管は、２層押出成形によって製管さ
れたもので、内側合成樹脂層として硬質塩化ビニルを、
外側合成樹脂層として、同じ硬質塩化ビニル内に樹脂１
００重量部に対して無機充填材として炭酸カルシウムを
３０重量部を添加し、均一混練したものを用いた。この
ときの外側合成樹脂層は線膨張係数が４．２×１０-5／
°Ｃ，ヤング率Ｅ2 が５０，０００ｋｇｆ／ｃｍ2 であ
り、内側合成樹脂層は線膨張係数が７．５×１０-5／°
Ｃ，ヤング率Ｅ1 が３０，０００ｋｇｆ／ｃｍ2 であ
る。A rubber adhesive is also applied to the outer peripheral surface of a two-layer vinyl chloride synthetic resin tube having an inner layer and an outer layer.
It was applied in a thickness of μm and dried in the same manner for 3 hours. This 2
The vinyl chloride pipe with a layered structure is made by two-layer extrusion, and hard vinyl chloride is used as the inner synthetic resin layer.
As an outer synthetic resin layer, resin 1 in the same hard vinyl chloride
A mixture obtained by adding 30 parts by weight of calcium carbonate as an inorganic filler to 00 parts by weight and uniformly kneading the mixture was used. At this time, the outer synthetic resin layer has a linear expansion coefficient of 4.2 × 10 −5 /
° C, Young's modulus E 2 is 50,000 kgf / cm 2 , and the coefficient of linear expansion of the inner synthetic resin layer is 7.5 × 10 -5 / °.
C, Young's modulus E 1 is 30,000 kgf / cm 2 .
【００１９】また、外側合成樹脂層の肉厚ｔ2 を０．６
ｍｍ、内側合成樹脂層の肉厚ｔ1 を１．０ｍｍとして、
２層合成樹脂管としての全肉厚を１．６ｍｍとし、この
合成樹脂管の外径は２２．２ｍｍとした。The thickness t 2 of the outer synthetic resin layer is set to 0.6.
mm, the thickness t 1 of the inner synthetic resin layer is 1.0 mm,
The total thickness of the two-layer synthetic resin tube was 1.6 mm, and the outer diameter of the synthetic resin tube was 22.2 mm.
【００２０】そして、接着剤塗布乾燥後の鋼管内に上記
の２層合成樹脂管を挿入し、鋼管の外径が２７．２ｍｍ
になるように縮径成形することにより、図１に示した構
造のライニング管を得た。Then, the above-mentioned two-layer synthetic resin pipe is inserted into the steel pipe after the adhesive is applied and dried, and the outer diameter of the steel pipe is 27.2 mm.
The lining pipe having the structure shown in FIG. 1 was obtained by reducing the diameter of the pipe.
【００２１】このライニング管において、鋼管と外側合
成樹脂層との間の剪断接着強度は、５０ｋｇｆ／ｃｍ2
であった。また、このライニング管４，０００ｍｍを６
０°Ｃに１０分間、続いて２０°Ｃに１０分間さらすサ
イクルを１０，０００サイクルにわたって繰り返すとい
う加熱〜冷却繰り返しテストを行った。テスト終了後に
管端部を観察したところ、図２に軸方向の部分断面図を
示すように鋼管と外側合成樹脂層との間をはじめとし
て、各層間のずれは生じていなかった。In this lining pipe, the shear bond strength between the steel pipe and the outer synthetic resin layer is 50 kgf / cm 2.
Met. In addition, this lining tube 4,000 mm
A heating-cooling repetition test was performed in which a cycle of exposure to 0 ° C. for 10 minutes and then to 20 ° C. for 10 minutes was repeated over 10,000 cycles. Observation of the end of the tube after the end of the test revealed that there was no displacement between the layers, including between the steel tube and the outer synthetic resin layer, as shown in the partial sectional view in the axial direction in FIG.
【００２２】また、このテスト終了後の管端部分での鋼
管と外側合成樹脂層との間の剪断接着強度は４５ｋｇｆ
／ｃｍ2 であり、テスト前に対して殆ど変化はなかっ
た。 （比較例）上記した実施例と同じ鋼管の内周面に同じゴ
ム系接着剤を３０μｍの厚さで塗布して３時間乾燥させ
るとともに、肉厚１．６ｍｍ、外径２２．２ｍｍの単層
の硬質塩化ビニル管の外周面にも同じゴム系接着剤を５
μｍの厚さで塗布して３時間乾燥させて鋼管内に挿入
し、上記と全く同じ縮径成形によって図３に示した構造
のライニング管を得た。The shear bond strength between the steel pipe and the outer synthetic resin layer at the end of the pipe after the test is 45 kgf.
/ Cm 2 , and there was almost no change from before the test. (Comparative Example) The same rubber-based adhesive was applied to the inner peripheral surface of the same steel pipe as in the above-described embodiment at a thickness of 30 μm, dried for 3 hours, and a single layer having a wall thickness of 1.6 mm and an outer diameter of 22.2 mm. The same rubber adhesive is also applied to the outer peripheral surface of
It was applied to a thickness of μm, dried for 3 hours, inserted into a steel pipe, and subjected to exactly the same diameter reduction molding as above to obtain a lining pipe having the structure shown in FIG.
【００２３】このライニング管の鋼管と硬質塩化ビニル
管との間の剪断接着強度は５０ｋｆｇ／ｃｍ2 であっ
た。このライニング管４，０００ｍｍに対して、６０°
Ｃ×１０分間、２０°Ｃ×１０分間の同じ加熱〜冷却繰
り返しテストを１０，０００サイクルにわたって施した
後、管端部を観察したところ、図４に示すように鋼管と
硬質塩化ビニル管との間には管端部分で０．５ｍｍのず
れが生じていた。The shear bond strength between the steel pipe of this lining pipe and the hard vinyl chloride pipe was 50 kfg / cm 2 . For this lining tube 4,000mm, 60 °
After performing the same heating-cooling repetition test of C × 10 minutes and 20 ° C. × 10 minutes for 10,000 cycles, the end of the tube was observed. As shown in FIG. A gap of 0.5 mm occurred between the pipe ends.
【００２４】また、このテスト終了後の管端部分におけ
る鋼管と硬質塩化ビニル管との間の剪断接着強度は１５
ｋｇｆ／ｃｍ2 に低下していた。The shear bond strength between the steel pipe and the hard PVC pipe at the end of the pipe after the test is 15
kgf / cm 2 .
【００２５】[0025]
【発明の効果】以上説明したように、本発明によれば、
金属管および合成樹脂管の少なくともいずれか一方に接
着剤が塗布された後、合成樹脂管が金属管内に挿入さ
れ、金属管が縮径成形されるか、あるいは合成樹脂管が
加熱膨張されることにより、金属管の内周面に接着剤層
を介して合成樹脂管が接着されてなり、金属管とその内
面防蝕用の合成樹脂管（内側合成樹脂層）との間に、こ
れらと略中間の線膨張係数を持つ中間層（外側合成樹脂
層）を介在させるとともに、この内側および外側合成樹
脂層の厚さｔ 1 とｔ 2 を、これら両者のヤング率Ｅ 1 と
Ｅ 2 に概略反比例した関係、すなわちｔ 1 ：ｔ 2 ≒
Ｅ 2 ：Ｅ 1 としているので、加熱と冷却が繰り返される
条件下で使用しても、接着剤層に作用する応力がこのよ
うな中間層を持たないものに比して大幅に小さくなり、
管端部における金属管と合成樹脂管とのずれを防止でき
ると同時に、接着力の低下も少なくすることができる。As described above, according to the present invention,
Contact at least one of metal tube and synthetic resin tube
After the adhesive has been applied, the plastic tube is inserted into the metal tube.
The metal tube is reduced in diameter or the synthetic resin tube is
An adhesive layer is formed on the inner peripheral surface of the metal tube by being expanded by heating.
A synthetic resin pipe is adhered through the metal pipe, and an intermediate layer (outer synthetic resin) having a linear expansion coefficient substantially intermediate between the metal pipe and the inner synthetic resin pipe for corrosion protection (inner synthetic resin layer). with an intervening layer), the thickness t 1 and t 2 of the inner and outer synthetic resin layer, the Young's modulus E 1 of both
A relationship approximately inversely proportional to E 2 , ie, t 1 : t 2 ≒
E 2: Since the E 1, even when used under conditions of heating and cooling are repeated, becomes considerably smaller than the ones stress acting on the adhesive layer does not have such an intermediate layer,
At the same time, it is possible to prevent the metal tube and the synthetic resin tube from shifting at the end of the tube, and at the same time, it is possible to reduce the decrease in adhesive strength.
【００２６】また、被搬送流体と接する内側樹脂層に
は、従来の対策のように無機充填材等を混入する必要が
なく、防蝕性の高い樹脂を選定することができるため、
水や熱水等の被搬送流体の浸透や充填材の溶出等の恐れ
がないとともに、その製造方法も、合成樹脂管の外周の
みに繊維強化を施す従来の構造のものに比して簡単であ
り、安価に製造することができる。Further, since it is not necessary to mix an inorganic filler or the like into the inner resin layer which is in contact with the fluid to be conveyed as in the conventional measures, a resin having high corrosion resistance can be selected.
There is no danger of infiltration of the fluid to be conveyed such as water or hot water or elution of the filler, and the manufacturing method is simpler than the conventional structure in which fiber reinforcement is applied only to the outer periphery of the synthetic resin pipe. Yes, and can be manufactured at low cost.
【図１】本発明実施例を半径方向に沿って切断した部分
断面図FIG. 1 is a partial cross-sectional view taken along a radial direction of an embodiment of the present invention.
【図２】本発明実施例に加熱〜冷却繰り返しテストを施
した後の管端部の状況を示す軸方向断面図FIG. 2 is an axial cross-sectional view showing a state of a pipe end portion after performing a heating-cooling repetition test on an embodiment of the present invention.
【図３】従来の合成樹脂ライニング管を半径方向に沿っ
て切断した部分断面図FIG. 3 is a partial cross-sectional view of a conventional synthetic resin lining pipe cut along a radial direction.
【図４】比較例に加熱〜冷却繰り返しテストを施した後
の管端部の状況を示す軸方向断面図FIG. 4 is an axial cross-sectional view showing a state of a pipe end portion after a repeated heating-cooling test is performed on a comparative example.
【符号の説明】 １０ 金属管 ２０ 合成樹脂管 ２１ 内側樹脂層 ２２ 外側樹脂層 ３０ 接着剤層[Description of Signs] 10 Metal tube 20 Synthetic resin tube 21 Inner resin layer 22 Outer resin layer 30 Adhesive layer
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｂ３２Ｂ 7/02 １０５ Ｂ３２Ｂ 7/02 １０５ Ｆ１６Ｌ 9/14 Ｆ１６Ｌ 9/14 (58)調査した分野(Int.Cl.7，ＤＢ名) B32B 15/08 B21C 37/06 B29C 63/34 B32B 1/08 F16L 9/14 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 identification code FI B32B 7/02 105 B32B 7/02 105 F16L 9/14 F16L 9/14 (58) Fields surveyed (Int.Cl. 7 , DB Name) B32B 15/08 B21C 37/06 B29C 63/34 B32B 1/08 F16L 9/14
Claims (1)
ずれか一方に接着剤が塗布された後、合成樹脂管が金属
管内に挿入され、金属管が縮径成形されるか、あるいは
合成樹脂管が加熱膨張されることにより、金属管の内周
面に接着剤層を介して合成樹脂管が接着されてなるライ
ニング管において、上記合成樹脂管が、最内層の内側合
成樹脂層と、その外側の外側合成樹脂層を有し、この外
側合成樹脂層は、上記金属管と内側合成樹脂層の各線膨
張係数の略中間の線膨張係数を有するとともに、内側合
成樹脂層の厚さｔ 1 と外側合成樹脂層の厚さｔ 2 が、そ
れぞれのヤング率Ｅ 1 とＥ 2 に概略反比例するような関
係、すなわちｔ 1 ：ｔ 2 ≒Ｅ 2 ：Ｅ 1 となっていること
を特徴とする合成樹脂ライニング管。At least one of a metal pipe and a synthetic resin pipe.
After the adhesive is applied to one or the other, the synthetic resin tube
Inserted into the tube, the metal tube is reduced in diameter, or
When the synthetic resin tube is heated and expanded, the synthetic resin tube is bonded to the inner peripheral surface of the metal tube via an adhesive layer. The outer synthetic resin layer has a coefficient of linear expansion substantially intermediate between the metal pipe and the inner synthetic resin layer, and has a thickness t of the inner synthetic resin layer. 1 and the thickness t 2 of the outer synthetic resin layer, each of the Young's modulus E 1 and functions as schematically inversely proportional to E 2
Engagement, i.e. t 1: t 2 ≒ E 2 : synthetic resin lining pipe, characterized in that has a E 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15214892A JP3152746B2 (en) | 1992-06-11 | 1992-06-11 | Synthetic resin lining tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15214892A JP3152746B2 (en) | 1992-06-11 | 1992-06-11 | Synthetic resin lining tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05338077A JPH05338077A (en) | 1993-12-21 |
| JP3152746B2 true JP3152746B2 (en) | 2001-04-03 |
Family
ID=15534088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15214892A Expired - Fee Related JP3152746B2 (en) | 1992-06-11 | 1992-06-11 | Synthetic resin lining tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3152746B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101710799B1 (en) * | 2015-09-14 | 2017-02-27 | 최병강 | A device of refrection mirror to see on's crown head |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3558422B2 (en) * | 1995-09-07 | 2004-08-25 | 三井化学株式会社 | Multi-layer tube |
| JP5306066B2 (en) * | 2009-06-04 | 2013-10-02 | 三洋電機株式会社 | SOLAR CELL MODULE AND METHOD FOR FORMING THE SAME |
| CN103615603A (en) * | 2013-11-29 | 2014-03-05 | 上海普川机电有限公司 | Manufacturing process of abrasion-resistant pipeline |
-
1992
- 1992-06-11 JP JP15214892A patent/JP3152746B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101710799B1 (en) * | 2015-09-14 | 2017-02-27 | 최병강 | A device of refrection mirror to see on's crown head |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05338077A (en) | 1993-12-21 |
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