JP4514764B2 - Double structure conduit for outdoor piping, method for improving residual strength and bendability of double structure conduit for outdoor piping, and method for improving residual strength, compression recovery and impact resistance of double structure conduit for outdoor piping - Google Patents
Double structure conduit for outdoor piping, method for improving residual strength and bendability of double structure conduit for outdoor piping, and method for improving residual strength, compression recovery and impact resistance of double structure conduit for outdoor piping Download PDFInfo
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- JP4514764B2 JP4514764B2 JP2007053537A JP2007053537A JP4514764B2 JP 4514764 B2 JP4514764 B2 JP 4514764B2 JP 2007053537 A JP2007053537 A JP 2007053537A JP 2007053537 A JP2007053537 A JP 2007053537A JP 4514764 B2 JP4514764 B2 JP 4514764B2
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- 238000000034 method Methods 0.000 title claims description 12
- 230000006835 compression Effects 0.000 title claims description 7
- 238000007906 compression Methods 0.000 title claims description 7
- 238000011084 recovery Methods 0.000 title claims description 3
- 238000005452 bending Methods 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 17
- -1 polyethylene Polymers 0.000 claims description 14
- 239000006229 carbon black Substances 0.000 claims description 13
- 238000010248 power generation Methods 0.000 claims description 9
- 239000004698 Polyethylene Substances 0.000 claims description 8
- 239000004566 building material Substances 0.000 claims description 8
- 229920000573 polyethylene Polymers 0.000 claims description 8
- 239000004800 polyvinyl chloride Substances 0.000 claims description 8
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 8
- 238000010998 test method Methods 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 claims description 7
- 239000004743 Polypropylene Substances 0.000 claims description 6
- 239000004793 Polystyrene Substances 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 claims description 6
- 229920002223 polystyrene Polymers 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 4
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims description 3
- 230000006866 deterioration Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 230000003313 weakening effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Details Of Indoor Wiring (AREA)
Description
本発明は、太陽光発電システムにおける配線その他屋外配線されるケーブル等の電線を保護するための屋外配管用二重構造電線管に関するものである。 The present invention relates to a double-structured electric conduit for outdoor piping for protecting electric wires such as wiring in a photovoltaic power generation system and other cables that are wired outdoors.
この種の電線管は、経時的に太陽光の照射を繰返し受けるほか変化の激しい外気に晒されるため、長期にわたってそれらに耐えうる特性を備えたものであることが望ましいが、そのような特性をもつ屋外配管用の電線管は提案されていない。
前記事状により、太陽光発電システムにおける屋外配線のための電線管においても、屋内配管用電線管の中の特に耐候性や難燃性を有する電線管が一般に使用されている。
Since this type of conduit is repeatedly exposed to sunlight over time and exposed to drastically changing outside air, it is desirable to have a characteristic that can withstand them for a long time. There are no proposed conduits for outdoor piping.
Due to the above-mentioned circumstances, a conduit having particularly weather resistance and flame retardancy among the conduits for indoor piping is generally used also for the conduit for outdoor wiring in the photovoltaic power generation system.
そのような電線管は多種類市販されているが、それらの一つとして、管の平均肉厚の６７〜９０％であって、０．１重量％以上のカーボンブラックが添加されたポリオレフィン系樹脂組成物からなる内層と、厚さが管の平均肉厚の１０〜３３％であって、０．１重量％未満のカーボンブラックが添加され酸素指数が２２以上の難燃性ポリオレフィン系樹脂組成物からなる外層とを、押出しにより一体成形した二層構造の電線管がある（後記特許文献１参照）。 There are many types of such conduits available on the market, but one of them is a polyolefin-based resin that is 67 to 90% of the average thickness of the tube and to which 0.1% by weight or more of carbon black is added. A flame retardant polyolefin resin composition having an inner layer composed of the composition and a thickness of 10 to 33% of the average wall thickness of the tube, less than 0.1% by weight of carbon black added, and an oxygen index of 22 or more There is a two-layered electric conduit that is integrally formed by extrusion with an outer layer made of (see Patent Document 1 below).
しかしながら、前記電線管は内外層の材料にカーボンブラックが添加されてはいるが、太陽光遮蔽以外の目的で添加したものであって添加量が十分でないため耐光性に乏しい。
曲げ配管部において、曲げ部の内周側では長さ方向に対して圧縮方向の、外周側では伸び方向の応力が加わるが、内層と外層が一体化されているためこれらの応力が内外層へ均一に加わり易く、外層がより肉薄で内層が管を主体であることと内外層の柔らかさ（曲げ剛性）に差がないととも相まって、外層の脆弱化が著しく先行する。
そのために、配管敷設後１３年前後経過すると曲げ配管部の外周側においては径方向に沿って（波の形成方向に沿って）割れが発生する。ＪＩＳ Ａ １４１５：１９９９による暴露試験の結果によってもそれは証明される。
In the bent pipe section, stress in the compression direction is applied to the length direction on the inner circumference side of the bent section, and in the extension direction on the outer circumference side, but these stresses are applied to the inner and outer layers because the inner and outer layers are integrated. It is easy to apply uniformly, the outer layer is thinner and the inner layer is mainly composed of a tube, and the softness (bending rigidity) of the inner and outer layers is not different, so the weakening of the outer layer is significantly preceded.
For this reason, cracks occur along the radial direction (along the wave forming direction) on the outer peripheral side of the bent pipe portion after about 13 years have passed since the pipe was laid. It is proved by the result of the exposure test according to JIS A 1415: 1999.
本発明の課題は屋外配管用二重構造電線管における寿命の一層の改善にあり、その目的は、配管敷設後長期にわたって割れなどが発生せず、耐光性及び耐久性に富む屋外配管用二重電線管を提供することにある。 An object of the present invention is to further improve the service life of a double-structured electric conduit for outdoor piping. The purpose of the present invention is to prevent the occurrence of cracks and the like for a long time after laying the pipe, and to improve the light resistance and durability. It is to provide a conduit.
本発明に係る屋内配管用二重構造電線管は、前記の課題を解決するため、押出成形されたポリエチレン，ポリプロピレン又はポリスチレンの波付可とう管からなる内管の外面に、押出により軟質ポリ塩化ビニルを被せて外管を形成した二重構造の電線管であって、さらに外管と内管の谷部に隙間を有し、外管と内管の断面が一部離れて変形でき、外管の山部中央の肉厚が内管の山部中央の肉厚より厚く、かつ、前記外管の曲げ剛性は前記内管の曲げ剛性よりも小さく、当該電線管の少なくとも外管の材料には太陽光を遮蔽するカーボンブラックが０．６〜３ｗｔ％添加されていることを最も主要な特徴としている。
In order to solve the above-mentioned problem, a double-structured electric conduit for indoor piping according to the present invention is formed by extrusion on the outer surface of an inner tube made of a polyethylene, polypropylene or polystyrene corrugated flexible tube by extrusion. It is a double-structured electric wire tube that is covered with vinyl to form an outer tube, and has a gap in the valley between the outer tube and the inner tube. The thickness at the center of the crest of the pipe is thicker than the thickness at the center of the crest of the inner pipe, and the bending rigidity of the outer pipe is smaller than the bending rigidity of the inner pipe. is the most important feature that the carbon black for shielding sunlight is added 0.6~3wt%.
本発明に係る屋外配管用二重構造電線管は、内管の外面に外管の内面が部分的に接触しており、内管の外面に両者者の管断面の一部に隙間を有する状態で軟質塩化ビニルを被せて外管を形成した二重構造管であり、内外の管は完全一体ではないので曲げ配管部における応力は内外の管に対して一体には加わらず、また内管に対して外管の曲げ剛性が小さい。従って、現場施工時に、壁から屋根への立ち上がり部や直交する壁等をまたいで配管する場合等、曲がり部を施工する際の曲げ力が従来の二層管に比べて少なく配管施工性が優れる。
本発明に係る屋外配管用二重構造電線管によれば、内管と外管の材料が相対的に紫外線吸収率の大きい合成樹脂であることと、少なくとも外管の材料には太陽光を遮蔽するためカーボンブラックが添加されているので、十分な耐光性を有する。
管に引張応力がほとんど働かない直線部に比べで、曲げ部に引張り応力が発生して紫外線による脆弱化が激しい外管に曲げ剛性の小さい材料を使用し、さらに外管と内管の断面の一部が離れて変形することができるようにし、曲げ部に発生する応力を、材料と管の断面形状との両者の観点で緩和することができることから、外管の脆弱化を弱め、むしろ外管の劣化は抑制されるので耐久性が一層向上する。
The double-structured electric conduit for outdoor piping according to the present invention is such that the inner surface of the outer tube is in partial contact with the outer surface of the inner tube, and the outer surface of the inner tube has a gap in part of the cross section of the two In this case, the outer pipe is covered with soft vinyl chloride and the outer pipe is formed. The inner and outer pipes are not completely integrated. On the other hand, the bending rigidity of the outer tube is small. Therefore, the pipe workability is less when compared to the conventional two-layer pipes when constructing a bent part, such as when piping over a rising part from the wall to the roof or an orthogonal wall during construction. .
According to the double-structured electric conduit tube for outdoor piping according to the present invention, the material of the inner tube and the outer tube is a synthetic resin having a relatively high ultraviolet absorption rate, and at least the material of the outer tube is shielded from sunlight. Therefore, since carbon black is added, it has sufficient light resistance.
Compared to the straight section where tensile stress is hardly applied to the pipe, a material with low bending rigidity is used for the outer pipe, which is severely weakened by ultraviolet rays because tensile stress is generated in the bent section. Since part can be deformed away and the stress generated in the bending part can be relaxed in terms of both the material and the cross-sectional shape of the pipe, the weakening of the outer pipe is weakened, rather the outer Since the deterioration of the tube is suppressed, the durability is further improved.
以下本発明に係る屋外配管用二重構造電線管の最良実施形態を説明する。
図１は電線管の部分半裁断面図である。
電線管１は、押出成形されたポリエチレン，ポリプロピレン又はポリスチレン製の波付可とう管からなる内管１０の外面に、押出により軟質ポリ塩化ビニルを被せて外管１１を形成した二重構造である。
電線管１の少なくとも外管１１の材料には、太陽光を遮蔽するためにカーボンブラックが添加されており、外管１１の曲げ剛性は前記内管１０の曲げ剛性よりも小さい。
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best embodiment of a double structure electric conduit for outdoor piping according to the present invention will be described.
FIG. 1 is a partially cut-away sectional view of a conduit tube.
The electric conduit 1 has a double structure in which an outer tube 11 is formed by covering an outer surface of an inner tube 10 made of an extruded polyethylene, polypropylene, or polystyrene corrugated flexible tube by extrusion with soft polyvinyl chloride. .
Carbon black is added to the material of at least the outer tube 11 of the conduit 1 in order to shield sunlight, and the bending rigidity of the outer tube 11 is smaller than the bending rigidity of the inner tube 10.
内管１０の材料であるポリエチレン，ポリプロピレン又はポリスチレンは耐燃性（炎がなくなると消える性質）を有するほか、太陽光の中でプラスチック材料を光劣化させる力が最も強い波長である紫外線を吸収し易い。
また外管１１の材料である軟質ポリ塩化ビニルは、紫外線を吸収し易く耐光性に優れかつ難燃性を有する。
Polyethylene, polypropylene, or polystyrene, which is the material of the inner tube 10, has flame resistance (a property that disappears when the flame disappears), and also easily absorbs ultraviolet rays, which have the strongest power to photodegrade the plastic material in sunlight. .
Soft polyvinyl chloride, which is the material of the outer tube 11, is easy to absorb ultraviolet rays and has excellent light resistance and flame retardancy.
前記のように、外管１１の曲げ剛性は内管１０の曲げ剛性よりも小さくしてあるが、これは屋外の曲げ配管部において内管１０よりも外管１１の伸びを大きくし、外気に晒される外管１１の劣化（脆弱化）が経時的に先行するのを抑制するためである。
両者の曲げ剛性の差は特に限定されないが、外管１１の曲げ剛性は内管１０の曲げ剛性の８０パーセント以下であるのが好ましい。
As described above, the bending rigidity of the outer tube 11 is smaller than the bending rigidity of the inner tube 10, but this increases the elongation of the outer tube 11 than the inner tube 10 in the outdoor bending piping section, so This is to suppress the deterioration (weakening) of the exposed outer tube 11 over time.
The difference in bending stiffness between the two is not particularly limited, but the bending stiffness of the outer tube 11 is preferably 80% or less of the bending stiffness of the inner tube 10.
外管１１の経時的劣化をより十分に抑制するためには、内管１０の山部中央の位置において、外管１１の平均肉厚ｔ２は内管１０の平均肉厚よりも大きくしてあるのが好ましく、前記位置における内管１０の平均肉厚は外管の平均肉厚の３５〜６５パーセントであるのがさらに好ましい。 In order to sufficiently suppress the deterioration with time of the outer tube 11, the average thickness t <b> 2 of the outer tube 11 is larger than the average thickness of the inner tube 10 at the center of the mountain portion of the inner tube 10. It is more preferable that the average thickness of the inner tube 10 at the above position is 35 to 65 percent of the average thickness of the outer tube.
外管１１の材料である軟質ポリ塩化ビニルに添加するカーボンブラックの添加量は、太陽光を遮蔽するのに必要十分な量であり、その添加量が０．３ｗｔ％未満であると太陽光を遮蔽するのに不十分である。
その添加量の上限は、添加量が２ｗｔ％を超えると効果がほぼ安定する。カーボンブラックは、電線管内の分散状態のばらつきを考慮しても、添加量の上限は３ｗｔ％で、それ以上の添加は効果がない。
The amount of carbon black added to the soft polyvinyl chloride that is the material of the outer tube 11 is an amount necessary and sufficient to shield sunlight, and if the amount added is less than 0.3 wt%, sunlight is Insufficient to shield.
The upper limit of the amount added is almost stable when the amount exceeds 2 wt%. Carbon black has an upper limit of 3 wt% even if the dispersion state in the conduit is taken into account, and addition beyond that is ineffective.
この実施形態の電線管１において、内管１０の内径（電線の呼込み有効直径である「呼び径」）Ｄ＝２２φ、内管１０の山部の高さ（谷部の深さ）＝２．５ｍｍ、内管１０の山部の平均肉厚ｔ１＝０．８ｍｍ、当該部分の外管１１の平均肉厚ｔ２＝１ｍｍ、内管１０山部ピッチ（隣接する山部相互の中心間の間隔）＝３．８ｍｍである。
また、内管１０の曲げ剛性＝０．１８Ｎ・ｍ２，外管１１の曲げ剛性＝０．１３Ｎ・ｍ２であり、外管１１及び内管１０の材料にはそれぞれ０．６ｗｔ％のカーボンブラックが添加してある。
In the conduit 1 of this embodiment, the inner diameter of the inner tube 10 (“nominal diameter” that is the effective diameter of the incoming wire) D = 22φ, the height of the crest of the inner tube 10 (depth of the valley) = 2. 5 mm, average thickness t1 of the crest of the inner pipe 10 = 0.8 mm, average thickness t2 = 1 mm of the outer pipe 11 of the portion, pitch of the crest of the inner pipe 10 (interval between the centers of adjacent crests) = 3.8 mm.
Further, the bending rigidity of the inner tube 10 is 0.18 N · m 2 , the bending rigidity of the outer tube 11 is 0.13 N · m 2 , and the material of the outer tube 11 and the inner tube 10 is 0.6 wt% of carbon. Black is added.
前記実施形態の電線管によれば、前記のように構成されていることにより、耐光性を含む耐候性に優れているとともに、外管１１の劣化の進行が抑制されるので、著しく耐久性に富んだものとなる。
電線管１はカーボンブラックの添加により黒になるので、通常の屋根の暗色とよりマッチングして目立ち難いという視覚的な効果を奏する。
また、図２で示す電線管１の曲げ配管部における曲率半径Ｒ＝６Ｄ（Ｄ：内管１０の内径）以上とすることにより、外管１１の曲げ配管部の外周側に作用する応力が相対的に小さくなり、外管１１の経時的劣化もさらに抑制される。
According to the electric conduit of the embodiment, since it is configured as described above, it has excellent weather resistance including light resistance, and the progress of deterioration of the outer tube 11 is suppressed. It will be rich.
Since the conduit 1 becomes black by the addition of carbon black, there is a visual effect that it is more inconspicuous by matching with the dark color of a normal roof.
Also, by setting the radius of curvature R = 6D (D: inner diameter of the inner pipe 10) or more in the bent pipe portion of the conduit 1 shown in FIG. 2, the stress acting on the outer peripheral side of the bent pipe portion of the outer pipe 11 is relative. Thus, the deterioration of the outer tube 11 over time is further suppressed.
性能試験１
前記実施形態の実施例電線管と実施例電線管と同形態でカーボンブラックを添加しない比較例電線管を試作した。
両種電線管について、外管材料である軟質塩化ビニルでＪＩＳ Ｋ ７１１３ ２号試験片を作成した（サンプルから外管を剥がし、練り直してプレートにしたものから２号試験片を型抜きした。）。それらについて、ＪＩＳ Ａ １４１５：１９９９「高分子系建築材料の実験室光源による暴露試験方法」ＷＳ−Ａ法に準じ、促進暴露試験を実施した。
Performance test 1
A comparative example conduit tube having the same form as the example conduit tube and the example conduit tube of the above embodiment but without adding carbon black was manufactured.
For both species conduit to prepare a JIS K 7113 No. 2 test piece of soft vinyl chloride is the outer tube material (peeling the outer tube from the sample was die-cut No. 2 test pieces from those to the plate reconsidered.) . About these, the accelerated exposure test was implemented according to JIS A 1415: 1999 "exposure test method of the laboratory building light source of polymeric building material" WS-A method.
試験条件の概要は以下のとおりである。
光源：オープンフレームカーボンアークランプ
カーボンアーク電圧・電流
交流電圧：許容範囲４８〜５２Ｖ、中心値５０±１Ｖ
交流電流：許容範囲５８〜６２Ａ、中心値６０±１．２Ａ
フィルタ：Ｉ型
波長：２５５ｎｍ、透過率：≦１％
波長：３０２ｎｍ、透過率：７１〜８６％
波長：≧３６０ｎｍ、透過率：＞９１％
試験片面の放射照度：２５５±（１０％）Ｗ／ｍ２（波長域３００〜７００ｎｍ）
バックパネル温度：６３±３℃
相対湿度：（５０±５）％
試験片面への水噴射サイクル：１０２分放射後、１８分放射及び水噴射
放射方向：連続放射
暴露時間（単位：時間）：０，２０００，３０００，４０００，５０００，６５００
ただし、比較例電線管の試験片については、後記のとおり２０００時間暴露で引張強度残率が著しく低下したので、それ以上の暴露試験は行なわなかった。
The outline of the test conditions is as follows.
Light source: Open frame carbon arc lamp Carbon arc voltage / current AC voltage: allowable range 48-52V, center value 50 ± 1V
AC current: allowable range 58-62A, center value 60 ± 1.2A
Filter: Type I
Wavelength: 255 nm, transmittance: ≦ 1%
Wavelength: 302 nm, transmittance: 71-86%
Wavelength: ≧ 360 nm, transmittance:> 91%
Irradiance on test surface: 255 ± (10%) W / m2 (wavelength range 300 to 700 nm)
Back panel temperature: 63 ± 3 ° C
Relative humidity: (50 ± 5)%
Water injection cycle on test specimen: 102 minutes after radiation, 18 minutes radiation and water ejection radiation direction: continuous radiation exposure time (unit: hours): 0, 2000, 3000, 4000, 5000, 6500
However, as for the test piece of the comparative example conduit tube, since the tensile strength residual ratio was remarkably reduced after 2000 hours exposure as described later, no further exposure test was conducted.
ＪＩＳ Ａ １４１５：１９９９「高分子系建築材料の実験室光源による暴露試験方法」ＷＳ−Ａ法に準じた、暴露時間：０、２０００、３０００、４０００、５０００．６５００時間の促進暴露後の２号試験片各５個について、ＪＩＳ Ｋ ６７２３：１９９５ 軟質ポリ塩化ビニルコンパウンド ６．３項 引張試験を実施（引張速度：２００ｍｍ／ｍｉｎ）し、各５個の試験片について引張強度残率平均を求めた。
その結果は図３のとおりであった。 図３で示されているように、実施例電線管は引張強度残率が９２．９％（２０００時間暴露）〜９７．５％（４０００時間暴露）の範囲内にあり、６５００時間暴露（３０年相当）の試験片でも９５％であって、優れた耐久性を示した。
JIS A 1415: 1999 “Experimental test method of polymeric building materials with laboratory light sources” No. 2 after accelerated exposure of 0, 2000, 3000, 4000, 5000.6500 hours according to WS-A method JIS K 6723: 1995 Soft polyvinyl chloride compound Section 6.3 Tensile test was conducted (tensile speed: 200 mm / min) for each of five test pieces, and the average tensile strength residual rate was determined for each of the five test pieces. .
The result was as shown in FIG. As shown in FIG. 3, the example conduit has a tensile strength residual ratio in the range of 92.9% (2000 hours exposure) to 97.5% (4000 hours exposure), and 6500 hours exposure (30 (Equivalent year) was 95%, showing excellent durability.
性能試験２
前記実施例電線管について長さ２００ｍｍに切断した試験片を準備し、前記と同様にＪＩＳ Ａ １４１５：１９９９「高分子系建築材料の実験室光源による暴露試験方法」ＷＳ−Ａ法に準じ、６５００時間の促進暴露試験を実施した。
ＪＩＳ Ａ １４１５：１９９９「高分子系建築材料の実験室光源による暴露試験方法」ＷＳ−Ａ法に準じた６５００時間の促進暴露試験後の試験片についてＪＩＳ Ｃ ８４１１：１９９９ 圧縮復元性・耐衝撃性試験を実施し、目視により外観を調べてその割れ・亀裂の有無を確認した。
Performance test 2
According to the JIS A 1415: 1999 “Exposure test method of polymer building materials using a laboratory light source” WS-A method, 6500 was prepared in the same manner as described above. A time accelerated exposure test was performed.
JIS A 1415: 1999 “Exposure test method for laboratory building light source of polymer building materials” JIS C 8411: 1999 Compression resilience / impact resistance of test piece after 6500 hours accelerated exposure test according to WS-A method The test was carried out, and the appearance was visually examined to confirm the presence or absence of cracks / cracks.
圧縮復元性試験では（性能：目視で認められるひび又は割れが生じず、かつ、試験前後の外径差が１０％を超えてはならない。）、試験片にひびや割れはなく、試験前後の外径差は２．６％であった。
また、耐衝撃性試験でも（１２個中９個以上のサンプルにひび又は割れが生じてはならない。）試験片にひびや割れは認められなかった。
これらの結果により、実施例電線管は耐久性が優れていることが判明した。
In the compression recovery test (performance: no cracks or cracks observed visually, and the outer diameter difference between before and after the test must not exceed 10%), the test piece has no cracks or cracks, and before and after the test. The outer diameter difference was 2.6%.
Further, even in the impact resistance test (no cracks or cracks should occur in 9 or more samples out of 12), no cracks or cracks were observed in the test piece.
From these results, it was found that the example conduit was excellent in durability.
１ 電線管
１０ 内管
１１ 外管
Ｄ 内管の内径（呼び径）
Ｒ 曲率半径
1 Conduit 10 Inner tube 11 Outer tube D Inner tube inner diameter (nominal diameter)
R Curvature radius
Claims (5)
Extruded polyethylene, the outer surface of the inner tube made of polypropylene or corrugated friendly Tou tube polystyrene, a conduit having a double structure formed with the outer tube covered with a soft polyvinyl chloride by extrusion, further outer tube And a gap in the valley of the inner pipe, the outer pipe and the inner pipe can be partially separated from each other, and the thickness of the central part of the outer pipe is thicker than the thickness of the central part of the inner pipe, and , flexural rigidity of the outer tube is smaller than the bending rigidity of the inner tube, characterized in that at least the outer tubing of the conduit carbon black for shielding sunlight is added 0.6～3Wt% A double-structured conduit for outdoor piping for solar power generation .
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| JP5820169B2 (en) * | 2011-07-13 | 2015-11-24 | 積水化学工業株式会社 | Insulated tube and method for manufacturing the same |
| JP2013036531A (en) * | 2011-08-08 | 2013-02-21 | Tokyo Gas Co Ltd | Cd pipe made of resin |
| JP6050109B2 (en) * | 2012-12-27 | 2016-12-21 | 未来工業株式会社 | Wiring / Piping material protection cover |
| CN103474186A (en) * | 2013-09-16 | 2013-12-25 | 太仓市晨洲塑业有限公司 | Carbon helix tube |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5543704Y2 (en) * | 1976-11-05 | 1980-10-14 | ||
| JPS63231084A (en) * | 1987-03-19 | 1988-09-27 | 未来工業株式会社 | Double layer pipe into which ground wire is fitted |
| JPH07137214A (en) * | 1993-11-19 | 1995-05-30 | Furukawa Electric Co Ltd:The | Flexible corrugated pipe made of synthetic resin |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0765701B2 (en) * | 1987-07-23 | 1995-07-19 | 三菱樹脂株式会社 | Polyethylene resin pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5543704Y2 (en) * | 1976-11-05 | 1980-10-14 | ||
| JPS63231084A (en) * | 1987-03-19 | 1988-09-27 | 未来工業株式会社 | Double layer pipe into which ground wire is fitted |
| JPH07137214A (en) * | 1993-11-19 | 1995-05-30 | Furukawa Electric Co Ltd:The | Flexible corrugated pipe made of synthetic resin |
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