JP2020008120A - Tube and tube manufacturing method - Google Patents
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Abstract
Description
本発明は、チューブ、特にコルゲート成型金型で成型されるコルゲートチューブに関する。 The present invention relates to a tube, particularly to a corrugated tube formed by a corrugating mold.
自動車の燃料タンクに燃料を導くチューブとして、蛇腹状のコルゲート部を備えたコルゲートチューブが知られている。コルゲート部は、軸方向に連続的に配置された山部と谷部を備えることによって、キンク半径を小さくでき、コルゲートチューブの配策性を向上することができる。ところが、コルゲート部は、内周面にも凹凸が形成されているので、燃料がコルゲートチューブ内を流れる際、燃料と内周面の間に生じる摩擦抵抗が大きい。したがって従来のコルゲートチューブは、内部を流れる燃料の流速が低下し、給油性が低下するという問題がある。 A corrugated tube provided with a corrugated corrugated portion is known as a tube for guiding fuel to a fuel tank of an automobile. Since the corrugated portion includes the peaks and the valleys that are continuously arranged in the axial direction, the kink radius can be reduced, and the arrangement of the corrugated tube can be improved. However, since the corrugated portion also has unevenness on the inner peripheral surface, when the fuel flows through the corrugated tube, frictional resistance generated between the fuel and the inner peripheral surface is large. Therefore, the conventional corrugated tube has a problem that the flow velocity of the fuel flowing inside is reduced, and the refueling property is reduced.
これに対し、コルゲート部の内周面を平滑にしたコルゲートチューブが開示されている（例えば、特許文献１、２）。特許文献１には、通路を平滑面とした第１蛇腹部を備えたコルゲートチューブが開示されている。特許文献２には、平滑な内周面と、波形の外周面を有するコルゲートチューブが開示されている。 On the other hand, a corrugated tube in which an inner peripheral surface of a corrugated portion is smoothed is disclosed (for example, Patent Documents 1 and 2). Patent Document 1 discloses a corrugated tube including a first bellows portion having a smooth passage. Patent Literature 2 discloses a corrugated tube having a smooth inner peripheral surface and a corrugated outer peripheral surface.
上記特許文献１の場合、外周面における谷部の深さを小さくすることによって、内周面をより平滑にできるが、谷が浅いので、山同士が接触し、自在に曲げることが困難であるという問題がある。上記特許文献２の場合、外周面は、内周面より実質的に硬いエラストマー材で形成する必要があるので、キンク半径を低減することが困難であるという懸念がある。 In the case of Patent Document 1, the inner peripheral surface can be made smoother by reducing the depth of the valley portion on the outer peripheral surface. However, since the valley is shallow, the ridges contact each other and it is difficult to bend freely. There is a problem. In the case of Patent Document 2, since the outer peripheral surface needs to be formed of an elastomer material that is substantially harder than the inner peripheral surface, there is a concern that it is difficult to reduce the kink radius.
本発明は、配策性と給油性とを向上することができるチューブを提供することを目的とする。 An object of the present invention is to provide a tube that can improve the ease of distribution and lubrication.
本発明に係るチューブは、外周面に山部と谷部とが連続して配置されたコルゲート部を備えたチューブであって、前記コルゲート部における軸方向に沿った断面において、山部の軸方向の半分の断面積Ｃと、谷部の断面積Ｄの比（Ｃ／Ｄ）が１．９４〜３．３０であり、前記コルゲート部における内周面の最大高さが０．１ｍｍ以下である。 The tube according to the present invention is a tube provided with a corrugated portion in which peaks and valleys are continuously arranged on the outer peripheral surface, and in a cross section along the axial direction of the corrugated portion, the tube has an axial direction of the peak. And the ratio (C / D) of the cross-sectional area C of the half to the cross-sectional area D of the valley is 1.94 to 3.30, and the maximum height of the inner peripheral surface in the corrugated portion is 0.1 mm or less. .
本発明によれば、断面積比（Ｃ／Ｄ）が３．３０以下であることによって、内周面の最大高さが０．１ｍｍ以下であるチューブが得られるので、燃料と内周面の間に生じる摩擦抵抗を低減できる。断面積比（Ｃ／Ｄ）が１．９４以上であることによって、チューブの曲げやすさが得られる。したがってチューブは、配策性と給油性とを向上することができる。 According to the present invention, since the cross-sectional area ratio (C / D) is 3.30 or less, a tube having the maximum height of the inner peripheral surface of 0.1 mm or less can be obtained. Friction resistance generated therebetween can be reduced. When the sectional area ratio (C / D) is 1.94 or more, the tube can be easily bent. Therefore, the tube can improve the arrangement property and the oil supply property.
本発明に係るチューブは、外周面に山部と谷部とが連続して配置されたコルゲート部を備える。コルゲート部における軸方向に沿った断面において、山部の軸方向の半分の断面積Ｃと、谷部の断面積Ｄの比（Ｃ／Ｄ）は、１．９４〜３．３０である。コルゲート部における内周面の最大高さは、０．１ｍｍ以下である。 The tube according to the present invention includes a corrugated portion in which peaks and valleys are continuously arranged on the outer peripheral surface. In the cross-section along the axial direction of the corrugated portion, the ratio (C / D) of the cross-sectional area C of half of the peak portion in the axial direction and the cross-sectional area D of the valley portion is 1.94 to 3.30. The maximum height of the inner peripheral surface of the corrugated portion is 0.1 mm or less.
チューブは、断面積比（Ｃ／Ｄ）が１．９４〜３．３０であることで、コルゲート部の内周面の最大高さが０．１ｍｍ以下であると同時に、良好な曲げ硬さが得られるので、配策性と給油性とを向上することができる。最大高さは、形状測定機を用いて測定した軸方向の内周面の粗さ曲線から、山頂線と谷底線との間隔を測定した値である。 Since the tube has a cross-sectional area ratio (C / D) of 1.94 to 3.30, the maximum height of the inner peripheral surface of the corrugated portion is 0.1 mm or less, and at the same time, good bending hardness is obtained. As a result, the arranging property and the refueling property can be improved. The maximum height is a value obtained by measuring the distance between the peak line and the valley line from the roughness curve of the inner peripheral surface in the axial direction measured using a shape measuring instrument.
チューブは、熱可塑性樹脂、例えば、ポリアミド系樹脂、ポリオレフィン系樹脂、フッ素系樹脂などで形成するのが好ましい。具体的には、高密度ポリエチレン（HDPE: High Density Polyethylene）で形成するのが好ましい。チューブは、半径方向に単一材料からなる単層である場合、及び複数の材料からなる複層である場合を含む。 The tube is preferably formed of a thermoplastic resin, for example, a polyamide resin, a polyolefin resin, a fluorine resin, or the like. Specifically, it is preferable to form with high density polyethylene (HDPE: High Density Polyethylene). The tube includes a case where the tube is a single layer made of a single material in the radial direction and a case where the tube is a multi-layer made of a plurality of materials.
チューブは、上記コルゲート部のほか、ストレート部、及び、外周面の山部と谷部に対応した凹凸を内周面に有する第２コルゲート部の少なくとも一方を備えていてもよい。ストレート部は、チューブの末端に設けられる場合、他の配管などに接続される。 The tube may include, in addition to the corrugated portion, at least one of a straight portion, and a second corrugated portion having irregularities on the inner peripheral surface corresponding to peaks and valleys on the outer peripheral surface. When the straight portion is provided at the end of the tube, it is connected to another pipe or the like.
チューブの外周面に設けられる山部と谷部の形状は、特に限定されず、軸方向に沿った断面において矩形状、台形状、山形状を含む。軸方向とは、チューブの内周面で囲まれた流路の中心軸に沿った方向をいう。 The shapes of the peaks and valleys provided on the outer peripheral surface of the tube are not particularly limited, and include a rectangular shape, a trapezoidal shape, and a mountain shape in a cross section along the axial direction. The axial direction refers to a direction along the central axis of the flow path surrounded by the inner peripheral surface of the tube.
１．第１実施形態
以下、図面を参照して本発明の実施形態について詳細に説明する。図１に示す単層のチューブ１０は、コルゲート部１２を備える。本図には、チューブ１０のコルゲート部１２の一部のみが示される。コルゲート部１２は、外周面に、環状の、山部１４と谷部１６とが配置されている。山部１４と谷部１６は、軸方向（図中Ｘ方向）に、所定の間隔をあけて、連続して配置されている。
1. First Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The single-layer tube 10 shown in FIG. In this figure, only a part of the corrugated portion 12 of the tube 10 is shown. The corrugated portion 12 has an annular crest portion 14 and a valley portion 16 arranged on an outer peripheral surface. The peaks 14 and the valleys 16 are continuously arranged at predetermined intervals in the axial direction (X direction in the figure).
山部１４の軸方向に沿った断面は、全体として矩形状であり、角部はＲ形状である。山部１４は、上面１５と、一対の側面１７とを有する。一対の側面１７は、上面１５の軸方向両側に連続して形成されている。側面１７は、一端において谷部１６の表面１９に接続されている。側面１７の一端において、側面１７に接する直線から、チューブ１０の外周面が離れる点を通り軸方向に垂直な面を、山部１４と谷部１６の境界とする。 The cross section along the axial direction of the peak 14 is rectangular as a whole, and the corner is R-shaped. The ridge 14 has an upper surface 15 and a pair of side surfaces 17. The pair of side surfaces 17 are formed continuously on both axial sides of the upper surface 15. The side surface 17 is connected at one end to the surface 19 of the valley 16. At one end of the side surface 17, a plane perpendicular to the axial direction passing through a point where the outer peripheral surface of the tube 10 is separated from a straight line contacting the side surface 17 is defined as a boundary between the peak portion 14 and the valley portion 16.
軸方向に沿った断面図において、山部１４の軸方向の半分の断面積をＣ、谷部１６の断面積をＤとする。断面積Ｃは、山部１４の中央から谷部１６との境界までの領域の面積である。断面積Ｄは、谷部１６の一側の山部１４との境界から、他側の山部１４との境界までの領域の面積である。断面積Ｃと断面積Ｄの比（Ｃ／Ｄ）は、１．９４〜３．３０である。断面積比（Ｃ／Ｄ）が上記範囲内の場合、最大高さが０．１ｍｍ以下である内周面１８と、良好な曲げ硬さとを備えるチューブ１０が得られる。断面積比（Ｃ／Ｄ）が３．３０超の場合、内周面１８の最大高さは、０．１ｍｍを超えてしまう。断面積比（Ｃ／Ｄ）は、３．１０未満であるのが好ましい。断面積比（Ｃ／Ｄ）が１．９４未満の場合、硬くなり曲げにくくなってしまう。断面積比（Ｃ／Ｄ）は、２．０９以上であるのが好ましい。 In the cross-sectional view along the axial direction, C is a cross-sectional area of half of the peak 14 in the axial direction, and D is a cross-sectional area of the valley 16. The cross-sectional area C is the area of the region from the center of the peak 14 to the boundary with the valley 16. The cross-sectional area D is the area of the region from the boundary with the peak 14 on one side of the valley 16 to the boundary with the peak 14 on the other side. The ratio (C / D) of the cross-sectional area C to the cross-sectional area D is 1.94 to 3.30. When the cross-sectional area ratio (C / D) is within the above range, a tube 10 having an inner peripheral surface 18 having a maximum height of 0.1 mm or less and a good bending hardness can be obtained. When the cross-sectional area ratio (C / D) exceeds 3.30, the maximum height of the inner peripheral surface 18 exceeds 0.1 mm. The cross-sectional area ratio (C / D) is preferably less than 3.10. If the cross-sectional area ratio (C / D) is less than 1.94, it becomes hard and difficult to bend. The cross-sectional area ratio (C / D) is preferably 2.09 or more.
断面積比（Ｃ／Ｄ）が上記範囲内であれば、山部１４の幅Ｗ、山部１４と山部１４の間隔Ｇ、谷部１６の深さＨ、チューブ１０の肉厚Ｔ、及びチューブ１０の内径Ｂは、適宜選択することができる。本図の場合、山部１４の幅Ｗは、上面１５のうち平坦な部分の長さである。例えば、山部１４の幅Ｗは０．２ｍｍ〜０．７ｍｍ、山部１４と山部１４の間隔Ｇは０．９ｍｍ〜２．２ｍｍ、谷部１６の深さＨは２．０ｍｍ〜３．２ｍｍ、チューブ１０の肉厚Ｔは１．９ｍｍ〜３．５ｍｍ、チューブ１０の内径Ｂは２６ｍｍ〜３２ｍｍとすることができる。 If the cross-sectional area ratio (C / D) is within the above range, the width W of the peak 14, the gap G between the peaks 14, the depth H of the valley 16, the thickness T of the tube 10, and The inner diameter B of the tube 10 can be appropriately selected. In the case of this figure, the width W of the peak 14 is the length of a flat portion of the upper surface 15. For example, the width W of the peak 14 is 0.2 mm to 0.7 mm, the interval G between the peaks 14 is 0.9 mm to 2.2 mm, and the depth H of the valley 16 is 2.0 mm to 3 mm. The thickness T of the tube 10 can be 1.9 mm to 3.5 mm, and the inner diameter B of the tube 10 can be 26 mm to 32 mm.
図２に上記チューブ１０を製造するコルゲータ２０を模式的に示す。コルゲータ２０は、押出機２５と成形部とを備える。押出機２５は、成形材料を送り出して成形部に供給する。成形材料は、熱可塑性樹脂であり、押出機２５によって加熱、軟化され、管状に押し出される。押出機２５による成形材料の送り出し速度は一定、すなわち単位時間当たりの成形材料の供給量は一定である。 FIG. 2 schematically shows a corrugator 20 for producing the tube 10. The corrugator 20 includes an extruder 25 and a molding unit. The extruder 25 sends out the molding material and supplies it to the molding unit. The molding material is a thermoplastic resin, heated and softened by the extruder 25, and extruded into a tube. The feeding speed of the molding material by the extruder 25 is constant, that is, the supply amount of the molding material per unit time is constant.
成形部は、一対の金型ユニット２２、２４と、真空吸引機構（図示省略）とを備えている。金型ユニット２２は、一対のプーリ２６、これらプーリ２６に巻き掛けられた無端ベルト２８、金型を構成する複数の第１割型３０、プーリ２６を介して無端ベルト２８を図中矢印の方向に走行させるモータ（図示省略）を有する。無端ベルト２８の外周面には、その走行方向に沿って第１割型３０が連続して取り付けられている。金型ユニット２４は、金型ユニット２２と同様、一対のプーリ３２、無端ベルト３４、複数の第２割型３６、無端ベルト３４を走行させるモータ（図示省略）を有する。無端ベルト３４の外周面には、第２割型３６が連続して取り付けられている。 The molding unit includes a pair of mold units 22 and 24 and a vacuum suction mechanism (not shown). The mold unit 22 moves the endless belt 28 through a pair of pulleys 26, an endless belt 28 wound around these pulleys 26, a plurality of first split dies 30 constituting the mold, and the pulley 26 in a direction indicated by an arrow in FIG. (Not shown). A first split mold 30 is continuously attached to the outer peripheral surface of the endless belt 28 along the running direction. The mold unit 24 has a motor (not shown) for running the pair of pulleys 32, the endless belt 34, the plurality of second split dies 36, and the endless belt 34, similarly to the mold unit 22. A second split mold 36 is continuously attached to the outer peripheral surface of the endless belt 34.
金型ユニット２２、２４は、第１割型３０と第２割型３６とを同一方向（図中矢印方向）に送り出すように、循環走行する。これによって、第１割型３０と第２割型３６は、押出機２５近傍の合流部において対応するもの同士で付き合わせられ、付き合わせられた状態で下流に向って移動し、分流部で開かれ、この後に合流部に向って移動する。金型ユニット２２、２４は、第１割型３０と第２割型３６が互いに同じ速度で一定の速度を維持して移動するように駆動される。 The mold units 22 and 24 circulate so as to send out the first split mold 30 and the second split mold 36 in the same direction (the direction of the arrow in the figure). As a result, the first split mold 30 and the second split mold 36 are brought together by the corresponding ones at the merging section near the extruder 25, move downstream in the mated state, and open at the branching section. He then moves toward the junction. The mold units 22 and 24 are driven such that the first mold 30 and the second mold 36 move at the same speed while maintaining a constant speed.
各第１割型３０と第２割型３６の外周側の面には、チューブ１０の外周面の形状に対応した成形面（図示省略）が形成されている。第１割型３０と第２割型３６のそれぞれには、チューブ１０の外周面の形状がその軸心方向に沿って複数に分割された成形面が割り当てられている。 A molding surface (not shown) corresponding to the shape of the outer peripheral surface of the tube 10 is formed on the outer peripheral surface of each of the first split mold 30 and the second split mold 36. Each of the first split mold 30 and the second split mold 36 is assigned a molding surface in which the shape of the outer peripheral surface of the tube 10 is divided into a plurality along the axial direction.
上記のように付き合わせられた第１割型３０と第２割型３６の内部には、チューブ１０を成形するための成形面で囲まれた中空部が形成される。第１割型３０と第２割型３６は、付き合わせられる際に、その中空部に押出機２５からの成形材料を取り込み、下流に移動する。中空部に成形材料を取り込んだ第１割型３０と第２割型３６が真空吸引機構の位置にまで移動すると、第１割型３０と第２割型３６に設けた吸引口（図示省略）から真空吸引機構による吸引が行われる。これによって、管状の成形材料は、第１割型３０と第２割型３６の成形面に密着し、その成形面に応じた管形状に成形される。成形材料の硬化後、分流部で第１割型３０と第２割型３６が開かれて、その内部から成形されたチューブ体４２が取り出される。 A hollow portion surrounded by a forming surface for forming the tube 10 is formed inside the first split mold 30 and the second split mold 36 that have been joined as described above. When the first split mold 30 and the second split mold 36 are put together, the molding material from the extruder 25 is taken into the hollow portion thereof and moves downstream. When the first mold 30 and the second mold 36 with the molding material taken into the hollow portion move to the position of the vacuum suction mechanism, suction ports provided in the first mold 30 and the second mold 36 (not shown). From the vacuum suction mechanism. As a result, the tubular molding material comes into close contact with the molding surfaces of the first mold 30 and the second mold 36 and is formed into a tube shape corresponding to the molding surfaces. After the molding material is cured, the first split mold 30 and the second split mold 36 are opened in the branching section, and the molded tube body 42 is taken out from the inside.
第１割型３０と第２割型３６の中空部への成形材料の取り込みから、成形されたチューブ体４２の取り出しまでが連続的に行われ、第１割型３０と第２割型３６が循環走行することによって、複数のチューブ１０の端部同士が繋がった状態で連続的に作製される。複数のチューブ１０は、それぞれの端部で個々のチューブ１０に切り離される。 From the incorporation of the molding material into the hollow portions of the first mold 30 and the second mold 36 to the removal of the molded tube body 42, the first mold 30 and the second mold 36 are continuously moved. By circulating, the tubes 10 are continuously manufactured in a state where the ends of the tubes 10 are connected to each other. The plurality of tubes 10 are cut into individual tubes 10 at each end.
第１割型３０と第２割型３６の中空部へ供給される熱可塑性樹脂の供給量は、単位時間当たり一定であり、かつ、断面積比（Ｃ／Ｄ）が１．９４〜３．３０となるように調整される。熱可塑性樹脂の供給量を、断面積比（Ｃ／Ｄ）が１．９４〜３．３０となる範囲に制限することによって、チューブ１０の内周面１８の最大高さが０．１ｍｍ以下であり、良好な曲げ硬さが得られる。 The supply amount of the thermoplastic resin supplied to the hollow portions of the first mold 30 and the second mold 36 is constant per unit time, and the cross-sectional area ratio (C / D) is 1.94 to 3.0. It is adjusted to be 30. By limiting the supply amount of the thermoplastic resin to a range in which the cross-sectional area ratio (C / D) is 1.94 to 3.30, the maximum height of the inner peripheral surface 18 of the tube 10 is 0.1 mm or less. Yes, good bending hardness can be obtained.
従来の製造方法の場合、押出口４０から供給された熱可塑性樹脂は、第１割型３０と第２割型３６の成型面に押し付けられる。したがって成型されるチューブ体は、外周面及び内周面に、成型面に応じた凹凸形状を有する。熱可塑性樹脂の供給量が増加するにつれて、肉厚Ｔが増加し、内周面１８の凹凸は小さくなっていく。熱可塑性樹脂の供給量が一定量を超えると、内周面１８の凹凸の大きさが変化せず、肉厚Ｔだけが増加する。肉厚Ｔが増加し過ぎると、チューブ１０は配策性が低下する。 In the case of the conventional manufacturing method, the thermoplastic resin supplied from the extrusion port 40 is pressed against the molding surfaces of the first split mold 30 and the second split mold 36. Therefore, the molded tube body has irregularities on the outer peripheral surface and the inner peripheral surface according to the molding surface. As the supply amount of the thermoplastic resin increases, the thickness T increases, and the unevenness of the inner peripheral surface 18 decreases. When the supply amount of the thermoplastic resin exceeds a certain amount, the size of the unevenness of the inner peripheral surface 18 does not change, and only the thickness T increases. If the wall thickness T increases too much, the tube 10 will be less maneuverable.
本実施形態に係るチューブ１０は、断面積比（Ｃ／Ｄ）が３．３０以下であることによって、内周面１８の最大高さが０．１ｍｍ以下であるから、燃料と内周面１８の間に生じる摩擦抵抗を低減できる。断面積比（Ｃ／Ｄ）が１．９４以上であることによって、チューブ１０の曲げやすさが得られる。したがってチューブ１０は、給油性と配策性とを向上することができる。 In the tube 10 according to the present embodiment, the cross-sectional area ratio (C / D) is 3.30 or less, and the maximum height of the inner peripheral surface 18 is 0.1 mm or less. Can reduce the frictional resistance generated between the two. When the sectional area ratio (C / D) is 1.94 or more, the tube 10 can be easily bent. Therefore, the tube 10 can improve the lubricating property and the workability.
２．第２実施形態
図３に示すチューブ５０は、第１実施形態のコルゲート部１２と同様の構造を有する第１コルゲート部５２に加え、第１及び第２ストレート部５４，５６、及び第２コルゲート部５８を備える。第１コルゲート部５２の一端には、第１ストレート部５４が設けられ、他端には第２コルゲート部５８の一端が接続されている。第２コルゲート部５８の他端には、第２ストレート部５６が接続されている。
2. Second Embodiment A tube 50 shown in FIG. 3 includes a first and second straight portions 54 and 56 and a second corrugated portion in addition to a first corrugated portion 52 having the same structure as the corrugated portion 12 of the first embodiment. 58. A first straight portion 54 is provided at one end of the first corrugated portion 52, and one end of a second corrugated portion 58 is connected to the other end. The second straight portion 56 is connected to the other end of the second corrugated portion 58.
第２コルゲート部５８及び第２ストレート部５６は、第１コルゲート部５２及び第１ストレート部５４に比べ大きい直径を有する。第２コルゲート部５８は、外周面に山部と谷部とが配置されている。山部と谷部は、軸方向に、所定の間隔をあけて、連続して配置されている。山部は、全体として矩形状であり、角部はＲ形状である。第２コルゲート部５８の内周面は、外周面の山部と谷部に対応した凹凸を有する。第２コルゲート部５８は、内周面に凹凸を有することによって、第１コルゲート部５２に比べ燃料との摩擦抵抗が大きいが、キンク半径がより小さい。 The second corrugated portion 58 and the second straight portion 56 have a larger diameter than the first corrugated portion 52 and the first straight portion 54. The second corrugated portion 58 has peaks and valleys on the outer peripheral surface. The peaks and the valleys are arranged continuously at a predetermined interval in the axial direction. The peaks are rectangular as a whole, and the corners are rounded. The inner peripheral surface of the second corrugated portion 58 has irregularities corresponding to the peaks and valleys of the outer peripheral surface. Since the second corrugated portion 58 has irregularities on the inner peripheral surface, the second corrugated portion 58 has a larger frictional resistance with fuel than the first corrugated portion 52, but has a smaller kink radius.
本実施形態のチューブ５０は、第１ストレート部５４を他の配管に接続して配策し、第２ストレート部５６を別の他の配管に接続して、設置される。チューブ５０は、第１コルゲート部５２を備えることによって、上記第１実施形態と同様の効果が得られる。 The tube 50 of the present embodiment is installed by connecting the first straight portion 54 to another pipe and arranging the same, and connecting the second straight portion 56 to another different pipe. By providing the tube 50 with the first corrugated portion 52, the same effect as in the first embodiment can be obtained.
第２コルゲート部５８は、キンク半径がより小さいので、より小さい曲げ半径で曲げることができる。したがってチューブ５０は、より小さい曲げ半径が要求される箇所に第２コルゲート部５８を配置することによって、より配策性を向上することができる。 Since the second corrugated portion 58 has a smaller kink radius, it can be bent with a smaller bending radius. Therefore, in the tube 50, the arrangement property can be further improved by arranging the second corrugated portion 58 at a position where a smaller bending radius is required.
３．変形例
本発明は、上記実施形態に限定されず、本発明の趣旨の範囲内で適宜変更することができる。
3. Modifications The present invention is not limited to the above embodiment, and can be appropriately modified within the spirit of the present invention.
第２実施形態の場合、第２コルゲート部５８及び第２ストレート部５６は、第１コルゲート部５２及び第１ストレート部５４に比べ大きい直径を有する場合について説明したが、本発明はこれに限らない。第２コルゲート部５８及び第２ストレート部５６は、第１コルゲート及び第１ストレート部５４と、同じ直径でもよいし、小さい直径でもよい。 In the case of the second embodiment, the case has been described where the second corrugated portion 58 and the second straight portion 56 have a larger diameter than the first corrugated portion 52 and the first straight portion 54, but the present invention is not limited to this. . The second corrugated portion 58 and the second straight portion 56 may have the same diameter as the first corrugated portion and the first straight portion 54, or may have a smaller diameter.
第２実施形態の場合、チューブ５０は、両端に第１、第２ストレート部５４、５６と、第１コルゲート部５２と、第２コルゲート部５８とを備える場合について説明したが、本発明はこれに限らない。チューブは、第２コルゲート部５８を省略してもよいし、第１コルゲート部５２の両端に第２コルゲート部５８を接続してもよく、第２コルゲート部５８の両端に第１コルゲート部５２を接続してもよい。また第１コルゲート部５２と第２コルゲート部５８を交互に配置してもよい。 In the case of the second embodiment, the case where the tube 50 includes the first and second straight portions 54 and 56, the first corrugated portion 52, and the second corrugated portion 58 at both ends has been described. Not limited to In the tube, the second corrugated portion 58 may be omitted, the second corrugated portion 58 may be connected to both ends of the first corrugated portion 52, and the first corrugated portion 52 may be connected to both ends of the second corrugated portion 58. You may connect. Further, the first corrugated portions 52 and the second corrugated portions 58 may be arranged alternately.
上記第１及び第２実施形態の場合、単層のチューブ１０、５０について説明したが、本発明はこれに限らず、２層以上でもよい。例えば、図４に示すように、チューブ６０のコルゲート部６１は、外層６２と、中間層６４と、内層６６とを備える複層でもよい。本図に示すチューブ６０は、外層６２と中間層６４が蛇腹形状である。内層６６で形成される内周面７２は、最大高さが０．１ｍｍ以下である。外層６２と内層６６は、同種の材料で形成してもよいし、異なる材料で形成してもよい。中間層６４は、ガスバリア性に優れた材料、例えばＥＶＯＨ（エチレン−ビニルアルコール共重合体）や、ＰＢＮ（ポリブチレンナフタレート）で形成してもよい。外層６２及び内層６６は、それぞれ複数の層で形成してもよい。本図に示すチューブ６０は、上記第１実施形態と同様の製造方法で製造することができる。例えば、チューブ６０は、中間層６４を挟んで厚さ方向の両側に、同量の熱可塑性樹脂を押出口４０から供給することによって、製造することができる。本図に示すチューブ６０は、山部６８の軸方向の半分の断面積Ｃと谷部７０の断面積Ｄの比（Ｃ／Ｄ）が１．９４〜３．３０、内周面７２の最大高さが０．１ｍｍ以下であるコルゲート部６１を備えることによって上記第１実施形態と同様の効果が得られる。チューブは、外層と中間層の間、及び／又は、中間層と内層の間に、さらに１又は２以上の層を備え、全体として、４層以上としてもよい。 In the first and second embodiments, the single-layer tubes 10 and 50 have been described. However, the present invention is not limited to this, and may include two or more layers. For example, as shown in FIG. 4, the corrugated portion 61 of the tube 60 may be a multilayer including an outer layer 62, an intermediate layer 64, and an inner layer 66. In the tube 60 shown in this figure, the outer layer 62 and the intermediate layer 64 have a bellows shape. The inner peripheral surface 72 formed by the inner layer 66 has a maximum height of 0.1 mm or less. The outer layer 62 and the inner layer 66 may be formed of the same type of material, or may be formed of different materials. The intermediate layer 64 may be formed of a material having excellent gas barrier properties, for example, EVOH (ethylene-vinyl alcohol copolymer) or PBN (polybutylene naphthalate). The outer layer 62 and the inner layer 66 may each be formed of a plurality of layers. The tube 60 shown in this figure can be manufactured by the same manufacturing method as in the first embodiment. For example, the tube 60 can be manufactured by supplying the same amount of thermoplastic resin from the extrusion port 40 to both sides in the thickness direction with the intermediate layer 64 interposed therebetween. The tube 60 shown in this figure has a ratio (C / D) of the cross-sectional area C of the half of the peak 68 in the axial direction to the cross-sectional area D of the valley 70 (C / D) of 1.94 to 3.30, and the maximum of the inner peripheral surface 72. By providing the corrugated portion 61 having a height of 0.1 mm or less, the same effect as in the first embodiment can be obtained. The tube may further include one or more layers between the outer layer and the intermediate layer and / or between the intermediate layer and the inner layer, and may have four or more layers as a whole.
４．実施例
上記第１実施形態で説明した製造方法を用いてコルゲート部を備えたチューブを作製し、効果を検証した。実施例に係るチューブは、材料にＨＤＰＥを用いた。断面積比（Ｃ／Ｄ）は、第１割型３０と第２割型３６の中空部へ単位時間当たりに供給される熱可塑性樹脂の供給量を変えることによって、調整した。各試料の内訳は、表１に示す通りである。なお、実施例１と実施例５は、蛇腹形状が異なる。本表における外径は、山部の外周径である。図５は、実施例４のチューブである。図６Ａは比較例２、図６Ｂは比較例３、図６Ｃは比較例４、図６Ｄは比較例５のチューブである。実施例１〜５及び比較例１〜４，１０，１１のチューブは、単層のチューブである。実施例６〜１０及び比較例５〜９，１２，１３は５層構造のチューブである。表１の材質の欄において、複数の材質が記載されている場合、材質の順番はチューブの内側から外側へ向かう順番である。
4. Example Using the manufacturing method described in the first embodiment, a tube provided with a corrugated portion was manufactured, and the effect was verified. The tube according to the example used HDPE as a material. The cross-sectional area ratio (C / D) was adjusted by changing the supply amount of the thermoplastic resin supplied to the hollow portions of the first mold 30 and the second mold 36 per unit time. The breakdown of each sample is as shown in Table 1. Note that the bellows shape differs between the first embodiment and the fifth embodiment. The outer diameter in this table is the outer diameter of the peak. FIG. 5 shows a tube of Example 4. 6A shows a tube of Comparative Example 2, FIG. 6B shows a tube of Comparative Example 3, FIG. 6C shows a tube of Comparative Example 4, and FIG. The tubes of Examples 1 to 5 and Comparative Examples 1 to 4, 10, and 11 are single-layer tubes. Examples 6 to 10 and Comparative Examples 5 to 9, 12, and 13 are tubes having a five-layer structure. When a plurality of materials are described in the material column of Table 1, the order of the materials is from the inside to the outside of the tube.
最大高さは、形状測定機を用いて得た軸方向の内周面の粗さ曲線から、山頂線と谷底線との間隔を測定した値である。最大高さが０．１ｍｍ以下の場合、内面平滑性が優れていると判断し「○」、０．１ｍｍ超の場合、内面平滑性が劣ると判断し「×」とした。曲げ硬さは、１１０℃で１０分間予熱したチューブをＲ７０のプーリで曲げた場合の曲げ荷重を図７に示す試験機８０で測定した。試験機８０は、二股に分かれたアーム８２と、アーム８２の先端に配置された一対の係止部８４とを有する。係止部８４の間隔は、１６２ｍｍとした。係止部８４上に長さ２８０ｍｍのチューブ８８を載せ、当該チューブ８８の略中央にプーリ８６を配置する。チューブ８８内には、内径に適合した折れ防止用のスプリング（図示しない）を配置した。アーム８２の基端を上方（図中矢印方向）に５０ｍｍ持ち上げてチューブ８８をプーリ８６に沿って４０度まで曲げる。このときの最大荷重を曲げ荷重とした。当該曲げ荷重が２５０Ｎ以下の場合、曲げ硬さが良好で配策性に優れていると判断し「○」、２５０Ｎ超の場合、実用的ではないと判断し「×」とした。本表から、実施例１〜１０は、断面積比（Ｃ／Ｄ）が１．９４〜３．３０の範囲のとき、最大高さが０．０５ｍｍ以下の内周面を有し、曲げ荷重が２５０Ｎ以下であるチューブが得られることが確認できた。すなわち断面積比（Ｃ／Ｄ）を上記範囲内とすることによって、内面平滑性及び配策性に優れたチューブが得られる。
これに対し、比較例１〜９は、断面積比（Ｃ／Ｄ）が３．３０超であるので、最大高さが０．１ｍｍを超えてしまい、良好な内面平滑性が得られない。比較例１０〜１３は、断面積比（Ｃ／Ｄ）１．９４未満であるので、曲げ荷重が２５０Ｎを超えてしまい、良好な配策性が得られない。
The maximum height is a value obtained by measuring the distance between the peak line and the valley line from the roughness curve of the inner peripheral surface in the axial direction obtained using a shape measuring instrument. When the maximum height was 0.1 mm or less, the inner surface smoothness was judged to be excellent, and when the maximum height was more than 0.1 mm, the inner surface smoothness was judged to be inferior. The bending hardness was measured by using a testing machine 80 shown in FIG. 7 when a tube preheated at 110 ° C. for 10 minutes was bent with an R70 pulley. The test machine 80 has an arm 82 that is divided into two branches, and a pair of locking portions 84 disposed at the tip of the arm 82. The interval between the locking portions 84 was 162 mm. A tube 88 having a length of 280 mm is placed on the locking portion 84, and a pulley 86 is disposed substantially at the center of the tube 88. Inside the tube 88, a spring (not shown) for preventing breakage, which is adapted to the inner diameter, is arranged. The base end of the arm 82 is lifted upward (in the direction of the arrow in the figure) by 50 mm, and the tube 88 is bent to 40 degrees along the pulley 86. The maximum load at this time was defined as a bending load. When the bending load was 250 N or less, it was judged that the bending hardness was good and the arrangement was excellent, and when the bending load was more than 250 N, it was judged that it was not practical and was set to “X”. From this table, when the cross-sectional area ratio (C / D) is in the range of 1.94 to 3.30, Examples 1 to 10 have an inner peripheral surface with a maximum height of 0.05 mm or less, and have a bending load. It was confirmed that a tube having a N of 250 N or less was obtained. That is, by setting the cross-sectional area ratio (C / D) within the above range, a tube excellent in inner surface smoothness and layout can be obtained.
On the other hand, in Comparative Examples 1 to 9, since the cross-sectional area ratio (C / D) is more than 3.30, the maximum height exceeds 0.1 mm, and good inner surface smoothness cannot be obtained. In Comparative Examples 10 to 13, since the cross-sectional area ratio (C / D) is less than 1.94, the bending load exceeds 250 N, and good arrangability cannot be obtained.
１０、５０、６０ チューブ
１２、６１ コルゲート部
１４ 山部
１６ 谷部
１８、７２ 内周面
５２ 第１コルゲート部
５４ 第１ストレート部（ストレート部）
５６ 第２ストレート部（ストレート部）
５８ 第２コルゲート部
６２ 外層
６４ 中間層
６６ 内層
６８ 山部
７０ 谷部
Ｃ 断面積
Ｄ 断面積
10, 50, 60 Tube 12, 61 Corrugated part 14 Peak part 16 Valley part 18, 72 Inner peripheral surface 52 First corrugated part 54 First straight part (straight part)
56 2nd straight part (straight part)
58 second corrugated part 62 outer layer 64 middle layer 66 inner layer 68 crest 70 valley C cross-sectional area D cross-sectional area
Claims (3)
前記コルゲート部における軸方向に沿った断面において、
山部の軸方向の半分の断面積Ｃと、谷部の断面積Ｄの比（Ｃ／Ｄ）が１．９４〜３．３０であり、
前記コルゲート部における内周面の最大高さが０．１ｍｍ以下
であるチューブ。 A tube having a corrugated portion in which a peak and a valley are continuously arranged on an outer peripheral surface,
In the cross section along the axial direction in the corrugated portion,
The ratio (C / D) of the cross-sectional area C in the axial half of the peak to the cross-sectional area D of the valley is 1.94 to 3.30,
A tube having a maximum height of an inner peripheral surface of the corrugated portion of 0.1 mm or less.
The tube according to claim 1, further comprising: the corrugated portion, a straight portion, and a second corrugated portion in which a peak portion and a valley portion are continuously arranged on an outer peripheral surface and an inner peripheral surface.
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