JP2002106759A - Corrugated tube - Google Patents
Corrugated tubeInfo
- Publication number
- JP2002106759A JP2002106759A JP2000295519A JP2000295519A JP2002106759A JP 2002106759 A JP2002106759 A JP 2002106759A JP 2000295519 A JP2000295519 A JP 2000295519A JP 2000295519 A JP2000295519 A JP 2000295519A JP 2002106759 A JP2002106759 A JP 2002106759A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- outer layer
- corrugated tube
- inner layer
- corrugated
- 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.)
- Granted
Links
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
- Details Of Indoor Wiring (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば自動車用配
管等に適した、熱可塑性樹脂からなる多層構造のコルゲ
ートチューブに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer corrugated tube made of a thermoplastic resin and suitable for, for example, automotive piping.
【０００２】[0002]
【従来の技術】近年、自動車のエア系配管、水系配管、
燃料系配管や、家庭用及び工業用の排水用配管、エア配
管等に、熱可塑性樹脂からなるコルゲートチューブが使
用されつつある。このコルゲートチューブは、外周に軸
方向に沿って所定間隔又は所定ピッチで配列された環状
又は螺旋状の突部を有し、ストレートチューブに比べて
屈曲性、振動吸収性に優れている。2. Description of the Related Art In recent years, air piping, water piping,
Corrugated tubes made of a thermoplastic resin are being used for fuel piping, domestic and industrial drain piping, air piping, and the like. The corrugated tube has annular or spiral protrusions arranged at predetermined intervals or predetermined pitches along the axial direction on the outer periphery, and is superior in flexibility and vibration absorption compared to a straight tube.
【０００３】米国特許５，３２４，５５７号には、同軸
的に配置された外層と、１以上の内層とを有する、熱可
塑性樹脂からなるコルゲートチューブであって、外層
は、環状又は螺旋状のリブを有し、内層の内周面は、凹
凸のない平滑な円筒面をなし、内層の熱可塑性樹脂は、
外層の熱可塑性樹脂よりも低密度であるものが開示され
ている。US Pat. No. 5,324,557 discloses a corrugated tube made of a thermoplastic resin having an outer layer disposed coaxially and one or more inner layers, wherein the outer layer has an annular or spiral shape. Has ribs, the inner peripheral surface of the inner layer is a smooth cylindrical surface without irregularities, the thermoplastic resin of the inner layer,
One having a lower density than the thermoplastic resin of the outer layer is disclosed.
【０００４】また、実公昭６０−７１３８号には、蛇腹
管からなる内管の外側に、発泡層を被覆し、発泡層の外
周に条帯を螺旋条に捲回し、更に発泡層の外周を合成樹
脂チューブで被覆してなる断熱管が開示されている。In Japanese Utility Model Publication No. 60-7138, a foam layer is coated on the outer side of an inner tube formed of a bellows tube, and a strip is wound around the outer periphery of the foam layer in a spiral strip. A heat insulating pipe covered with a synthetic resin tube is disclosed.
【０００５】これらのチューブは、低密度の樹脂層又は
発泡層を設けたことにより、断熱性等に優れるという利
点を有している。[0005] These tubes have an advantage that they are provided with a low-density resin layer or a foamed layer, so that they have excellent heat insulating properties and the like.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、米国特
許５，３２４，５５７号のチューブでは、内層の内周面
が凹凸のない平滑な円筒面をなしているので、屈曲性
や、振動吸収性が損なわれてしまい、屈曲時にキンクを
生じやすいという問題点があった。However, in the tube of U.S. Pat. No. 5,324,557, the inner peripheral surface of the inner layer has a smooth cylindrical surface with no irregularities, so that the tube has poor flexibility and vibration absorption. There is a problem that the ink is damaged and a kink is easily generated at the time of bending.
【０００７】また、実公昭６０−７１３８号の断熱管で
は、内管が蛇腹管からなるので、流体の通過圧損が大き
くなり、流体が流れるときに発生する音も大きくなりや
すいという問題点があった。Further, in the heat insulating pipe disclosed in Japanese Utility Model Publication No. 60-7138, since the inner pipe is formed of a bellows pipe, there is a problem that the pressure loss of the fluid passing through the pipe increases and the sound generated when the fluid flows tends to increase. Was.
【０００８】したがって、本発明の目的は、屈曲性や、
振動吸収性に優れると共に、流体の通過圧損も比較的小
さいコルゲートチューブを提供することにある。[0008] Therefore, the object of the present invention is to provide flexibility and
An object of the present invention is to provide a corrugated tube which is excellent in vibration absorption and has relatively small fluid pressure loss.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するた
め、本発明の第１は、熱可塑性樹脂からなり、外周に軸
方向に沿って所定間隔又は所定ピッチで配列された環状
又は螺旋状の突部を有するコルゲートチューブにおい
て、チューブ内周に配置された内層と、チューブ外周に
配置された外層と、これらの層の間に配置された中間層
とを備えており、前記中間層は発泡した熱可塑性樹脂か
らなり、前記内層は、前記外層と同位相で、前記外層よ
りも緩やかな波形断面をなすことを特徴とするコルゲー
トチューブを提供するものである。In order to achieve the above object, a first aspect of the present invention is to provide an annular or helical ring made of a thermoplastic resin and arranged on the outer periphery at a predetermined interval or a predetermined pitch along the axial direction. In a corrugated tube having a protrusion, an inner layer arranged on the inner periphery of the tube, an outer layer arranged on the outer periphery of the tube, and an intermediate layer arranged between these layers are provided, and the intermediate layer is foamed. The present invention provides a corrugated tube comprising a thermoplastic resin, wherein the inner layer has the same phase as the outer layer and has a gentler waveform cross section than the outer layer.
【００１０】上記発明によれば、中間層が発泡した熱可
塑性樹脂からなるので、断熱性、消音性、衝撃吸収性等
に優れている。また、内層は、外層と同位相で、外層よ
りも緩やかな波形断面をなすので、屈曲性、振動吸収性
に優れており、かつ、流体の通過圧損も比較的低く保た
れる。According to the above-mentioned invention, since the intermediate layer is made of a foamed thermoplastic resin, it is excellent in heat insulating properties, sound deadening properties, shock absorbing properties, and the like. Further, the inner layer has the same phase as the outer layer and has a gentler waveform cross-section than the outer layer, so that the inner layer is excellent in flexibility and vibration absorption, and the pressure loss of passage of the fluid is kept relatively low.
【００１１】本発明の第２は、前記第１の発明におい
て、前記中間層は、前記内層に近接した部分に比べて、
前記外層に近接した部分の方が、発泡率が高くなってい
るコルゲートチューブを提供するものである。According to a second aspect of the present invention, in the first aspect, the intermediate layer has a smaller size than a portion adjacent to the inner layer.
The portion closer to the outer layer provides a corrugated tube having a higher foaming rate.
【００１２】上記発明によれば、中間層の内層に近接し
た部分に比べて、外層に近接した部分の方が、発泡率が
高くなっていることにより、外部から衝撃が作用したと
き、チューブの外周に近接した部分で衝撃が吸収されや
すくなり、内層の破断等の虞れを低減させることができ
る。[0012] According to the above invention, since the foaming rate of the portion close to the outer layer is higher than that of the intermediate layer closer to the inner layer, the impact of the tube from the outside when the impact acts from the outside. The impact is easily absorbed at a portion close to the outer periphery, and the risk of breakage of the inner layer can be reduced.
【００１３】本発明の第３は、前記第１又は第２の発明
において、前記内層の厚さは、環状又は螺旋状の前記突
部が位置する部分において厚く、前記突部の間の谷部に
位置する部分において薄くなっており、前記外層の厚さ
は、前記突部が位置する部分において薄く、前記谷部に
位置する部分において厚くなっているコルゲートチュー
ブを提供するものである。According to a third aspect of the present invention, in the first or second aspect, the thickness of the inner layer is thick at a portion where the annular or spiral projection is located, and a valley between the projections is provided. And the thickness of the outer layer is thinner at the portion where the protrusion is located and thicker at the portion located at the valley.
【００１４】上記発明によれば、内層の厚さが薄い部分
では、外層の厚さが厚くなり、内層の厚さが厚い部分で
は、外層の厚さが薄くなっているので、全体としての引
張強度の低下を招くことなく、屈曲性を向上させること
ができる。According to the above invention, the thickness of the outer layer is large in the portion where the thickness of the inner layer is small, and the thickness of the outer layer is small in the portion where the thickness of the inner layer is large. Flexibility can be improved without lowering the strength.
【００１５】なお、前記第１〜３の発明において、前記
中間層は、前記内層の熱可塑性樹脂の融点よりも低い融
点の熱可塑性樹脂からなっていることが好ましい。In the first to third aspects, it is preferable that the intermediate layer is made of a thermoplastic resin having a melting point lower than that of the thermoplastic resin of the inner layer.
【００１６】上記発明によれば、コルゲートチューブ成
形時に温度低下によって内層が固化した後に、中間層が
固化することになるので、内層と中間層とがよく接合
し、層間剥離が生じにくいという利点が得られる。According to the above invention, the intermediate layer is solidified after the inner layer is solidified due to a decrease in temperature during the molding of the corrugated tube, so that the inner layer and the intermediate layer are joined well and delamination is less likely to occur. can get.
【００１７】[0017]
【発明の実施の形態】以下、図面を参照しながら本発明
の実施形態を説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１８】図１は、本発明によるコルゲートチューブ
の一実施形態を示す部分拡大した一部切欠き断面図であ
る。図１は、右部分がチューブの断面、左部分が外側か
ら見た形状を表している。FIG. 1 is a partially enlarged cross-sectional view showing a corrugated tube according to an embodiment of the present invention. In FIG. 1, the right part shows the cross section of the tube, and the left part shows the shape viewed from the outside.
【００１９】このコルゲートチューブ１０は、外層１１
と、内層１２と、中間層１３とからなる３層構造をなし
ている。これらの層１１、１２、１３は、同種又は異な
る種類の熱可塑性樹脂（熱可塑性エラストマーを含む）
からなり、中間層１３は、発泡剤を添加された樹脂で構
成されている。これらの熱可塑性樹脂の好ましい例とし
ては、ポリプロピレン、ポリエチレン、ポリアミド、ポ
リアセタール、ポリエステル、ポリオレフィン系エラス
トマー、ポリアミド系エラストマー、ポリエステル系エ
ラストマー等が挙げられる。なお、中間層１３として
は、これらの熱可塑性樹脂（エラストマーを含む）に、
アゾジカルボン等の発泡剤（又はそのマスターバッチ）
を配合したものを押出すか、あるいは窒素ガスや炭酸ガ
ス等を押出機の外部から注入して押出すことが好まし
い。The corrugated tube 10 has an outer layer 11
, An inner layer 12 and an intermediate layer 13. These layers 11, 12 and 13 are made of the same or different kinds of thermoplastic resins (including thermoplastic elastomers).
The intermediate layer 13 is made of a resin to which a foaming agent is added. Preferred examples of these thermoplastic resins include polypropylene, polyethylene, polyamide, polyacetal, polyester, polyolefin-based elastomer, polyamide-based elastomer, polyester-based elastomer, and the like. The intermediate layer 13 may be made of any of these thermoplastic resins (including elastomers)
Blowing agent such as azodicarbon (or its masterbatch)
It is preferable to extrude a mixture of these, or to extrude by injecting nitrogen gas, carbon dioxide gas or the like from the outside of the extruder.
【００２０】外層１１は、軸方向に沿った断面が波形を
なし、それによって、外側から見たとき、環状の突部１
１Ａと、環状の谷部１１Ｂとが交互に配列されたコルゲ
ート形状をなしている。The outer layer 11 has a corrugated cross section along the axial direction, so that when viewed from the outside, the annular protrusion 1
1A and the annular valley 11B are alternately arranged in a corrugated shape.
【００２１】内層１２は、軸方向に沿った断面が、外層
１１と同位相の波形をなし、内周面側から見たとき、前
記突部１１Ａに対応する部分が環状の凹部１２Ａをな
し、前記谷部１１Ｂに対応する部分が環状の突部１２Ｂ
をなしている。また、内層１２の内周面の凹凸は、外層
１１の外周面の凹凸よりも緩やかな凹凸をなし、それに
よって、コルゲートチューブ１０の屈曲性を保持しつ
つ、内部を流れる流体の圧損を低減させている。The inner layer 12 has a cross section along the axial direction having a waveform having the same phase as that of the outer layer 11, and when viewed from the inner peripheral surface side, a portion corresponding to the projection 11A forms an annular concave portion 12A. A portion corresponding to the valley portion 11B is an annular protrusion 12B.
Has made. In addition, the unevenness of the inner peripheral surface of the inner layer 12 forms a more gentle unevenness than the unevenness of the outer peripheral surface of the outer layer 11, thereby reducing the pressure loss of the fluid flowing inside while maintaining the flexibility of the corrugated tube 10. ing.
【００２２】外層１１の突部１１Ａの肉厚ｔ１は、谷部
１１Ｂの肉厚ｔ２よりも薄くなっている。一方、内層１
２の凹部１２Ａの肉厚ｔ３は、突部１２Ｂの肉厚ｔ４よ
りも厚くなっている。その結果、外層１１の薄い部分で
は、内層１２が厚くなり、内層１２が薄い部分では、外
層１１が厚くなって、相補的に肉厚が維持され、コルゲ
ートチューブ１０としての引張強度を維持することがで
きる。また、外層１１及び内層１２のそれぞれに肉厚の
厚い部分と薄い部分とが交互に形成されていることによ
り、コルゲートチューブ１０の屈曲性を向上させること
ができる。The thickness t1 of the projection 11A of the outer layer 11 is smaller than the thickness t2 of the valley 11B. Meanwhile, inner layer 1
The thickness t3 of the second recess 12A is greater than the thickness t4 of the projection 12B. As a result, in the thin portion of the outer layer 11, the inner layer 12 becomes thicker, and in the thinner portion of the inner layer 12, the outer layer 11 becomes thicker so that the thickness is complementarily maintained and the tensile strength of the corrugated tube 10 is maintained. Can be. In addition, since the thick portion and the thin portion are alternately formed in each of the outer layer 11 and the inner layer 12, the flexibility of the corrugated tube 10 can be improved.
【００２３】また、中間層１３の発泡倍率（発泡しない
場合の体積に対する発泡後の体積の割合）は、２〜１０
倍が好ましい。そして、この発泡率は、内層１２に近接
した部分では小さく、外層１１に近接した部分、特に外
層１１の突部１１Ａに近接した部分では大きくなってい
る。すなわち、中間層１３の外層１１に近接した部分ほ
ど、気孔の大きさが大きく、その数も多くなっていて、
内部の空隙が大きくなっている。このため、コルゲート
チューブ１０の突部１１Ａに、例えば走行中の車輪が跳
ね上げた飛石などが当たり、強い衝撃が作用した場合で
も、中間層１３の発泡率の高い部分がこの衝撃を効果的
に和らげ、内層１２の破断等を防止するため、流体の漏
れ等を未然に防ぐことができる。The expansion ratio (the ratio of the volume after foaming to the volume when foaming is not performed) of the intermediate layer 13 is 2 to 10
Double is preferred. The foaming rate is small in the portion close to the inner layer 12 and large in the portion close to the outer layer 11, particularly, the portion close to the protrusion 11 </ b> A of the outer layer 11. That is, the portion of the intermediate layer 13 closer to the outer layer 11 has a larger pore size and a larger number of pores.
The internal void is large. For this reason, even if, for example, a flying stone or the like from a running wheel hits the projection 11A of the corrugated tube 10 and a strong impact is applied, the portion of the intermediate layer 13 where the foaming rate is high effectively reduces the impact. In order to soften and prevent the inner layer 12 from breaking or the like, fluid leakage or the like can be prevented.
【００２４】図２は、本発明のコルゲートチューブの製
造方法を示す説明図である。図２において、Ｌはチュー
ブの中心線であり、図では下方の断面だけを示してい
る。FIG. 2 is an explanatory view showing a method of manufacturing a corrugated tube according to the present invention. In FIG. 2, L is the center line of the tube, and only the lower section is shown in the figure.
【００２５】図２において、３層ダイ内で３層に積層さ
れた溶融樹脂は、ダイ先端部に付いたノズル２０から同
心状に押出される。こうして筒状に押出された樹脂は、
外管１１を形成する熱可塑性樹脂１１Ｐと、中間層１３
を形成する熱可塑性樹脂１３Ｐと、内管１２を形成する
熱可塑性樹脂１２Ｐとからなる。この筒状に押出された
樹脂は、更に円筒状に組合された金型３０の内側に吸引
されて、コルゲート形状に成形される。In FIG. 2, molten resin laminated in three layers in a three-layer die is extruded concentrically from a nozzle 20 provided at the tip of the die. The resin extruded into a cylindrical shape in this way
A thermoplastic resin 11P for forming the outer tube 11;
And the thermoplastic resin 12P forming the inner tube 12. The resin extruded in a cylindrical shape is further sucked into the mold 30 combined in a cylindrical shape, and is formed into a corrugated shape.
【００２６】なお、金型３０は、一対ずつ組み合わせて
全体として円筒状の型を構成する所定長さの半円筒部材
からなり、これらが長手方向に隣接して前記熱可塑性樹
脂１１Ｐ、１２Ｐ、１３Ｐの押出し速度に同期して移動
すると共に、その内面に形成された吸引孔３１を通して
吸引するようになっている。また、長手方向に隣接する
吸引孔３１の間には、内周から中心方向に突出する複数
の環状突起３２が形成されている。そして、ノズル２０
からチューブ状に押出された熱可塑性樹脂１１Ｐ、１３
Ｐ、１２Ｐは、円筒状に組み付けられた金型３０の内側
に挟まれて移動しつつ、金型３０の吸引孔３１を通して
吸引されることによって、上記環状突起３２を有する金
型３０の内周面に徐々に密着する。The mold 30 is formed of a semi-cylindrical member having a predetermined length, which is combined with each pair to form a cylindrical mold as a whole, and these are adjacent to each other in the longitudinal direction and the thermoplastic resins 11P, 12P, and 13P. It moves in synchronism with the extrusion speed, and sucks through a suction hole 31 formed in the inner surface thereof. Further, between the suction holes 31 adjacent in the longitudinal direction, a plurality of annular projections 32 projecting from the inner periphery toward the center are formed. And the nozzle 20
Thermoplastic resin 11P, 13 extruded from tube
P and 12P are sucked through the suction holes 31 of the mold 30 while being moved while being sandwiched inside the mold 30 assembled in a cylindrical shape, so that the inner circumference of the mold 30 having the annular protrusion 32 is formed. Adhere gradually to the surface.
【００２７】このとき、中間層１３の熱可塑性樹脂１３
Ｐは、発泡剤を含有しており、外層１１の熱可塑性樹脂
１１Ｐと、内層１２の熱可塑性樹脂１２Ｐとに挟まれな
がら発泡して、外層１１の波形変形を助けると共に、内
層１２の波形変形を外層１１に比べて緩やかにする。そ
の結果、外層１１の環状の突部１１Ａと谷部１１Ｂとが
形成され、コルゲート形状となる。また、内層１２は、
外層１１及び中間層１３を介して金型３０の内周形状に
適合するため、外層１１ほど顕著な波形をなすことな
く、外層１１と同期した緩やかな波形の断面となる。At this time, the thermoplastic resin 13
P contains a foaming agent and foams while being sandwiched between the thermoplastic resin 11P of the outer layer 11 and the thermoplastic resin 12P of the inner layer 12 to assist in the waveform deformation of the outer layer 11 and the waveform deformation of the inner layer 12. Is made gentler than the outer layer 11. As a result, an annular protrusion 11A and a valley 11B of the outer layer 11 are formed, and the corrugated shape is obtained. Also, the inner layer 12
Since the outer layer 11 and the intermediate layer 13 are adapted to the inner peripheral shape of the mold 30 via the outer layer 11 and the outer layer 11, the cross section has a gentle waveform synchronized with the outer layer 11 without forming a noticeable waveform as in the outer layer 11.
【００２８】[0028]
【実施例】実施例１ 外層１１としてオレフィン系熱可塑性エラストマー（商
品名「サントプレーン１０３−５０」、エーイーエス・
ジャパン株式会社製）、内層１２としてポリプロピレン
（商品名「グランドポリプロＢ２４６」、株式会社グラ
ンドポリマー製）、中間層１３としてオレフィン系熱可
塑性エラストマー（商品名「ＴＰＶ ＧＱ９１０」、旭
化成工業株式会社製）を用い、図２に示すような方法に
よって、図１に示す形状のコルゲートチューブを製造し
た。EXAMPLES Example 1 An olefin-based thermoplastic elastomer (trade name "Santoprene 103-50", manufactured by A.S.
Japan Co., Ltd.), polypropylene as inner layer 12 (trade name “Grand Polypro B246”, manufactured by Grand Polymer Co., Ltd.), and olefin thermoplastic elastomer (trade name “TPV GQ910”, Asahi Kasei Corporation) as intermediate layer 13. A corrugated tube having the shape shown in FIG. 1 was manufactured using the method shown in FIG.
【００２９】ノズル２０からの押出し時における外層１
１の厚さは０．３ｍｍ、内層１２の厚さは０．３ｍｍ、
中間層１３の厚さは０．４ｍｍとした。外層１１の熱可
塑性樹脂１１Ｐの押出し時の温度は２１０℃、内層１２
の熱可塑性樹脂１２Ｐの押出し時の温度は２４０℃、中
間層１３の熱可塑性樹脂１３Ｐの押出し時の温度は２０
０℃、ダイ温度２４０℃とした。Outer layer 1 during extrusion from nozzle 20
1, the thickness of the inner layer 12 is 0.3 mm,
The thickness of the intermediate layer 13 was 0.4 mm. The temperature at the time of extrusion of the thermoplastic resin 11P of the outer layer 11 is 210 ° C.
The temperature at the time of extrusion of the thermoplastic resin 12P is 240 ° C., and the temperature at the time of extrusion of the thermoplastic resin 13P of the intermediate layer 13 is 20 ° C.
The temperature was 0 ° C. and the die temperature was 240 ° C.
【００３０】中間層１３の熱可塑性樹脂１３Ｐには、発
泡剤マスターバッチ（商品名「ＥＸＰＰ−２０」、株式
会社グランドポリマー製）を６質量％添加し、平均発泡
率が突部で約５倍、谷部で約２倍となるように発泡させ
た。6% by mass of a foaming agent masterbatch (trade name "EXPP-20", manufactured by Grand Polymer Co., Ltd.) is added to the thermoplastic resin 13P of the intermediate layer 13, and the average foaming ratio is about 5 times at the protrusion. And the valley was foamed so as to be about twice as large.
【００３１】こうして押出したチューブを、前述した金
型３０の内面に吸着させて、波形断面のコルゲートチュ
ーブ１０に成形した。このコルゲートチューブ１０は、
外径２５ｍｍであった。The tube thus extruded was adsorbed on the inner surface of the above-described mold 30 to form a corrugated tube 10 having a corrugated cross section. This corrugated tube 10
The outer diameter was 25 mm.
【００３２】比較例１ 実施例１において、中間層１３の樹脂中に発泡剤を添加
しない他は、実施例１と同様にしてコルゲートチューブ
を製造した。Comparative Example 1 A corrugated tube was manufactured in the same manner as in Example 1 except that no foaming agent was added to the resin of the intermediate layer 13.
【００３３】こうして得られた実施例１及び比較例１の
コルゲートチューブについて、その断熱性及び消音性を
測定した。With respect to the corrugated tubes of Example 1 and Comparative Example 1 thus obtained, their heat insulating properties and sound deadening properties were measured.
【００３４】図３は、２０℃に保温しておいた各コルゲ
ートチユーブ（長さ１００ｍｍ）を低温雰囲気下（０
℃）に放置し、コルゲート内側表面温度と放置時間（ｍ
ｉｎ）との関係を測定した結果を示す。FIG. 3 shows that each corrugated tube (100 mm in length) kept at 20 ° C. was placed in a low-temperature atmosphere (0 mm).
℃), the inside surface temperature of the corrugate and the standing time (m
3 shows the results of measuring the relationship with the in).
【００３５】また、図４は、各コルゲートチューブ（長
さ４００ｍｍ）の内部に空気を流量を変えて流し（０〜
１００ｍ3／ｍｉｎ）、５００ｍｍの距離をおいて音量
（ｄＢ）を測定した結果を示している。FIG. 4 shows that the air is flowed into each corrugated tube (400 mm in length) at different flow rates (0 to 0).
The results of measuring the sound volume (dB) at a distance of 100 m 3 / min) and 500 mm are shown.
【００３６】なお、図３、４において、線Ｄは、本発明
による実施例１のコルゲートチューブを使用した場合の
測定結果を示し、線Ｅは、比較例１のコルゲートチュー
ブを使用した場合の測定結果を示す。3 and 4, line D shows the measurement results when the corrugated tube of Example 1 according to the present invention was used, and line E shows the measurement results when the corrugated tube of Comparative Example 1 was used. The results are shown.
【００３７】このように、本発明のコルゲートチューブ
は、保温効果が高く、内部流体の流れによる音量発生も
少ないことがわかる。As described above, it can be seen that the corrugated tube of the present invention has a high heat retaining effect and generates little volume due to the flow of the internal fluid.
【００３８】[0038]
【発明の効果】以上説明したように、本発明によれば、
中間層が発泡した熱可塑性樹脂からなるので、断熱性、
消音性、衝撃吸収性等に優れている。また、内層は、外
層と同位相で、外層よりも緩やかな波形断面をなすの
で、屈曲性に優れており、かつ、流体の通過圧損も比較
的低く保たれる。As described above, according to the present invention,
Since the middle layer is made of foamed thermoplastic resin, heat insulation,
Excellent sound deadening and shock absorption. Further, the inner layer has the same phase as the outer layer and has a gentler waveform cross-section than the outer layer, so that the inner layer is excellent in bendability and the pressure loss of fluid passage is kept relatively low.
【図１】 本発明によるコルゲートチューブの一実施形
態を示す部分拡大した一部切欠き断面図である。FIG. 1 is a partially enlarged cross-sectional view showing a corrugated tube according to an embodiment of the present invention in a partially enlarged manner.
【図２】 本発明のコルゲートチューブの製造方法を示
す説明図である。FIG. 2 is an explanatory view showing a method for manufacturing a corrugated tube of the present invention.
【図３】 ２０℃に保温しておいた実施例１及び比較例
２のコルゲートチューブを低温雰囲気下（０℃）に放置
した場合のコルゲート内側表面の温度と放置時間（ｍｉ
ｎ）との関係を示す図表である。FIG. 3 shows the temperature of the corrugated tube inner surface and the standing time (mi) when the corrugated tubes of Example 1 and Comparative Example 2 kept at 20 ° C. were left in a low-temperature atmosphere (0 ° C.).
3 is a table showing the relationship with n).
【図４】 実施例１及び比較例２のコルゲートチューブ
の内部に空気を流量を変えて流し（０〜１００ｍ3／ｍ
ｉｎ）、５００ｍｍの距離をおいて音量（ｄＢ）を測定
した結果を示す図表である。FIG. 4 shows the flow of air (0 to 100 m 3 / m) inside the corrugated tubes of Example 1 and Comparative Example 2 at different flow rates.
3 is a table showing the results of measuring sound volume (dB) at a distance of 500 mm in).
１０ コルゲートチューブ １１ 外層 １１Ａ 突部 １１Ｂ 谷部 １１Ｐ 外層の熱可塑性樹脂 １２ 内層 １２Ａ 環状凹部 １２Ｂ 環状突部 １２Ｐ 内層の熱可塑性樹脂 １３ 中間層 ３０ 金型 ３１ 吸引孔 DESCRIPTION OF SYMBOLS 10 Corrugated tube 11 Outer layer 11A Projection 11B Valley 11P Outer layer thermoplastic resin 12 Inner layer 12A Annular concave part 12B Annular projection 12P Inner layer thermoplastic resin 13 Intermediate layer 30 Mold 31 Suction hole
───────────────────────────────────────────────────── フロントページの続き (72)発明者 米澤 孝広 神奈川県横浜市保土ケ谷区岩井町51番地 株式会社パイオラックス内 Ｆターム(参考） 3H111 AA02 BA15 CA42 CA53 CB04 DA13 DA26 DB03 DB05 DB08 DB11 EA04 5G357 DA10 DC12 DD01 DD05 DD10 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takahiro Yonezawa 51 Iwai-cho, Hodogaya-ku, Yokohama-shi, Kanagawa Prefecture F-term Co., Ltd. F-term (reference) 3H111 AA02 BA15 CA42 CA53 CB04 DA13 DA26 DB03 DB05 DB08 DB11 EA04 5G357 DA10 DC12 DD01 DD05 DD10
Claims (3)
沿って所定間隔又は所定ピッチで配列された環状又は螺
旋状の突部を有するコルゲートチューブにおいて、チュ
ーブ内周に配置された内層と、チューブ外周に配置され
た外層と、これらの層の間に配置された中間層とを備え
ており、前記中間層は発泡した熱可塑性樹脂からなり、
前記内層は、前記外層と同位相で、前記外層よりも緩や
かな波形断面をなすことを特徴とするコルゲートチュー
ブ。1. A corrugated tube made of a thermoplastic resin and having annular or helical protrusions arranged at predetermined intervals or at predetermined pitches along an axial direction on an outer periphery, an inner layer disposed on the inner periphery of the tube, An outer layer disposed on the outer periphery of the tube, and an intermediate layer disposed between these layers, the intermediate layer is made of a foamed thermoplastic resin,
A corrugated tube, wherein the inner layer has the same phase as the outer layer and has a gentler waveform cross section than the outer layer.
に比べて、前記外層に近接した部分の方が、発泡率が高
くなっている請求項１記載のコルゲートチューブ。2. The corrugated tube according to claim 1, wherein the intermediate layer has a higher foaming rate in a portion close to the outer layer than in a portion close to the inner layer.
記突部が位置する部分において厚く、前記突部の間の谷
部に位置する部分において薄くなっており、前記外層の
厚さは、前記突部が位置する部分において薄く、前記谷
部に位置する部分において厚くなっている請求項１又は
２記載のコルゲートチューブ。3. The thickness of the inner layer is thicker at a portion where the annular or spiral projection is located, and thinner at a portion located at a valley between the projections. The corrugated tube according to claim 1, wherein a thickness of the corrugated tube is thinner at a portion where the protrusion is located and thicker at a portion located at the valley.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000295519A JP4516680B2 (en) | 2000-09-28 | 2000-09-28 | Corrugated tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000295519A JP4516680B2 (en) | 2000-09-28 | 2000-09-28 | Corrugated tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002106759A true JP2002106759A (en) | 2002-04-10 |
| JP4516680B2 JP4516680B2 (en) | 2010-08-04 |
Family
ID=18777934
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000295519A Expired - Fee Related JP4516680B2 (en) | 2000-09-28 | 2000-09-28 | Corrugated tube |
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| Country | Link |
|---|---|
| JP (1) | JP4516680B2 (en) |
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