JP2010048329A - 合成樹脂パイプ及びその製造方法並びに接続方法 - Google Patents
合成樹脂パイプ及びその製造方法並びに接続方法 Download PDFInfo
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- JP2010048329A JP2010048329A JP2008212765A JP2008212765A JP2010048329A JP 2010048329 A JP2010048329 A JP 2010048329A JP 2008212765 A JP2008212765 A JP 2008212765A JP 2008212765 A JP2008212765 A JP 2008212765A JP 2010048329 A JP2010048329 A JP 2010048329A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L11/08—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall
- F16L11/081—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising one or more layers of a helically wound cord or wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
- B29C65/2053—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror" characterised by special ways of bringing the welding mirrors into position
- B29C65/2061—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror" characterised by special ways of bringing the welding mirrors into position by sliding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/114—Single butt joints
- B29C66/1142—Single butt to butt joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
- B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
- B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
- B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
- B29C66/324—Avoiding burr formation
- B29C66/3242—Avoiding burr formation on the inside of a tubular or hollow article
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5229—Joining tubular articles involving the use of a socket
- B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
- B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/63—Internally supporting the article during joining
- B29C66/636—Internally supporting the article during joining using a support which remains in the joined object
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/721—Fibre-reinforced materials
- B29C66/7214—Fibre-reinforced materials characterised by the length of the fibres
- B29C66/72141—Fibres of continuous length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
- B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
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- B32B1/00—Layered products having a general shape other than plane
- B32B1/08—Tubular products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
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- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L11/08—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall
- F16L11/081—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising one or more layers of a helically wound cord or wire
- F16L11/082—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising one or more layers of a helically wound cord or wire two layers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
- B29C65/5057—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like positioned between the surfaces to be joined
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Abstract
【解決手段】 複数の層1,2の間に接着層3を形成し、複数の層1,2の各々の層と接着層3との間に、補強材として螺旋状補強材4a,5aを夫々の傾斜角度が逆向きになるように螺旋状に巻回して、前記接着層3の内周面及び外周面に沿って前記補強層4,5を夫々形成することにより、内側の層1の外周面と接着層3の内周面とが、螺旋状補強材4aに形成される螺旋状の隙間を通って直接接触し固着されるとともに、外側の層2の内周面と接着層3の外周面とが、螺旋状補強材5aの螺旋状の隙間を通って直接接触し固着される。
【選択図】 図1
Description
詳しくは、複数の層を積層してパイプ本体が形成され、これら複数の層の間に補強材を螺旋状に巻回して補強層が形成される合成樹脂パイプ及びその製造方法並びに接続方法に関する。
さらに、2層の補強層同士が直接接触するため、パイプ全体に曲げなどの外力が作用する度に、これら補強層の間に摩擦が発生して位置ズレしたり破損するおそれがあるという問題があった。
また、延伸ポリオレフィン系樹脂シートが巻回された内層管の表面を赤外線炉で加熱して該樹脂シートを内層管に融着し、この際、シート隙間に内層管の樹脂を充填し、その後、外層を押出し被覆するため、この延伸ポリオレフィン系樹脂シートが熱の影響を受け易く、それにより延伸した樹脂シートが収縮したり、物性が劣化し易くなってパイプ全体の耐圧性能及び耐久性能が低下するという問題もあった。
第二の発明は、第一の発明の目的に加えて、パイプ本体の内周面及び外周面を平坦にすることを目的としたものである。
第三の発明は、第一の発明又は第二の発明の目的に加えて、螺旋状補強材への熱伝動を最小限に抑制することを目的としたものである。
第四の発明は、第一の発明又は第二の発明の目的に加えて、パイプ接続状態でパイプ端面からの水の浸入によるウィーピング現象やブリスター破壊の発生を防止することを目的としたものである。
第二の発明は、第一の発明の構成に、前記複数の層を熱可塑性樹脂で形成するとともに、これら複数の層の熱可塑性樹脂よりも流動性の高い熱可塑性樹脂で接着層を形成した構成を加えたことを特徴とする。
第三の発明は、前記接着層を積層した後に冷却し、この冷却工程の後に接着層の外周面に沿って螺旋状補強材を螺旋状に巻回したことを特徴とするものである。
第四の発明は、前記複数の層及び接着層と螺旋状補強材が同系の合成樹脂で形成されてなる前記パイプ本体の軸方向端部を加熱溶融し、接続相手に圧接させて熱溶着したことを特徴とする。
したがって、複数の層の接着強度を高めることができる。
その結果、内層と外層との間で2層の補強層同士が接触するものの内層と外層が直接接触する箇所がない従来のものに比べ、パイプ内の急激な圧力変化に伴って層間が剥離し難くなって耐圧性能が向上する。
さらに、2層の補強層同士が直接接触する従来のものに比べ、接着層を挟んで補強層が配置されて螺旋状補強材同士が直接触れないため、パイプ全体に曲げなどの外力が作用しても、螺旋状補強材の位置ズレや糸切れなどの破損を防止できる。
したがって、パイプ本体の内周面及び外周面を平坦にすることができる。
したがって、螺旋状補強材への熱伝動を最小限に抑制することができる。
その結果、延伸樹脂シートが巻回された内層管の表面を加熱して融着した後に外層を押出し被覆する従来のものに比べ、延伸加工された螺旋状補強材の収縮や物性劣化を抑えることができ、それによりバイブ全体の耐圧性能及び耐久性能を向上できる。
したがって、パイプ接続状態でパイプ端面からの水の浸入によるウィーピング現象やブリスター破壊の発生を防止することができる。
特に、接着層3には、内層1及び外層2に用いる熱可塑性樹脂よりも流動性(メルトインデックス)の高い熱可塑性樹脂を用いることが好ましい。
この冷却工程の後は、接着層3の外周面3aに沿って螺旋状補強材5aを、螺旋状補強材4aと傾斜角度が逆向きになるように螺旋状に巻回し、その後、必要に応じて冷却してから、最後に外層2を押出し成形して積層する。
さらに、これら内層1と最内層の間や外層2と最外層の間又は内層1や外層2や接着層3の内部には、これらと同系の合成樹脂からなる補強線材を、パイプ本体A′の軸方向略全長に亘って配置することも可能である。
さらに、延伸モノフィラメントやマルチフィラメントに代えて、テープ状の糸からなるフラットヤーン(又はテープヤーン)を用いることも可能であり、この場合には該補強線材3の肉厚寸法が薄くなって、パイプ本体A′全体の肉厚寸法を薄くすることができるという利点がある。
このパイプ接続構造は、上述した合成樹脂パイプAと、この合成樹脂パイプAの軸方向端部A1に嵌合する継手管Bとを備え、これら合成樹脂パイプAの軸方向端部A1と継手管Bとの対向面を加熱手段(図示しない)により溶融し、これら溶融された対向面を相互に圧接させて溶着している。
図示例では、該継手管Bの2つの開口を一直線上に開設し、これら開口に2本の合成樹脂パイプAが夫々押し込まれて接続される直管の場合を示している。
この場合には、継手管Bに対する合成樹脂パイプAの押し込みにより、継手内周面B1とパイプ外周面A2が圧接すると同時に、継手管B内の段部B2と合成樹脂パイプAの軸方向先端面A3が圧接して、これらの圧接部分が夫々溶着される。
また、これと逆に圧接部分からパイプ外周面A2に沿って継手管Bの端面B3へ向かう溶融樹脂Rは、該継手管Bの端面B3からパイプ外側に盛り上がって流出し、そのまま環状に突出して硬化する。
それにより、パイプ内周面A4よりも内側へ盛り上がって硬化した環状の樹脂Rは、流路を部分的に絞って、所定の流量を確保できないおそれがあり、またパイプ外周面A2よりも外側へ盛り上がって硬化した環状の樹脂Rは、外観を低下させるおそれがある。
この流動規制手段Cとしては、図3(a)(b)に示す如く、合成樹脂パイプAの軸方向端部A1と継手管Bとの接続部分を封止カバーC1で該合成樹脂パイプAの内側から覆うように取り付けることにより、該合成樹脂パイプAの押し込み及び圧接に伴って溢れ出る溶融樹脂Rを、パイプ外周面A2沿いに継手管Bの端面B3へ向け誘導して硬化させることが好ましい。
以下、本発明の各実施例を図面に基づいて説明する。
さらに、接着層3を挟んで補強層4,5の螺旋状補強材4a,5aが配置されて、これら螺旋状補強材4a,5a同士が直接触れないため、螺旋状補強材4a,5aのピッチズレや糸切れが発生しない。
それにより、パイプ本体A′の内周面及び外周面を平坦にできる。
それにより、螺旋状補強材4a,5aへの熱伝動を最小限に抑制してこれら螺旋状補強材4a,5aの熱収縮や熱劣化を確実に抑えることができる。
図2に示す如く、先ず、各パイプ本体A′の軸方向端部のみを例えばヒータなどの加熱手段(図示しない)で加熱した後に、これらパイプ本体A′が一直線上になるように各端面を突き合わせて相互に圧接させると、夫々の内層1、外層2、接着層3と螺旋状補強材4a,5a及び補強線材6の軸方向端部が溶融して一体になり、これら螺旋状補強材4a,5a、補強線材6が内層1、外層2及び接着層3に熱溶着される。
なお、図示例の場合には、各パイプ本体A′の軸方向端面同士から流出した溶融樹脂Rが、内層1の内側及び外層2の外側に夫々盛り上がって環状に突出して硬化した例を示しているが、上述したように少なくとも内層1の内側には環状に盛り上がって硬化しないようにすることが好ましい。
先ず、図3(a)の二点鎖線に示す如く、合成樹脂パイプAの軸方向端部A1の外周面A2及び先端面A3と、それに対向する継手管Bの内周面B1とを、それらに例えばヒータなどの加熱手段(図示しない)を接触させるなどして夫々が加熱される。
その後、図3(b)に示す如く、この加熱された継手内周面B1に沿って、加熱されたパイプ外周面A2を挿入することで、これら両者を圧接させるとともに、パイプ先端面A3を継手管B内の段部B2に突き当てる。
したがって、図3(a)(b)に示す実施例2は、合成樹脂パイプAと継手管Bとのパイプ接続部において溶融樹脂Rがパイプ内周面A4に盛り上がって硬化することを防止でき、流路を絞ることがないため、所定の流量を確保できる。
また、合成樹脂パイプAの押し込み及びパイプ外周面A2及び継手内周面B1の圧接に伴って流出する溶融樹脂Rの一部又はほとんどが貯留部C2内へ流れ込むため、パイプ外周面A2に沿って継手管Bの端面B3へ向かう溶融樹脂Rの量が減り、それにより、パイプ外周面A2よりも外側へ盛り上がって硬化する樹脂Rが大幅に減少して目立たなくなり、外観の低下が緩和されるという利点もある。
その他の例として、合成樹脂パイプAの軸方向と垂直なパイプ先端面A3に環状の貯留部C3を形成することも可能である。
さらに、前述したパイプ接続方法の実施例2〜実施例4では、合成樹脂パイプAの軸方向端部A1が接続される開口の内周面B1に、それに挿入される合成樹脂パイプAの軸方向先端面A3が突き当たる段部B2を突出形成したが、これに限定されず、該段部B2無しで、接続する2本の合成樹脂パイプAの軸方向先端面A3同士が突き当たるようにして、これら先端面A3同士の圧接部分と、継手内周面B1及びパイプ外周面A2の圧接部分を夫々溶着するようにしても良い。
1 内層 1a 外周面
2 外層 3 接着層
3a 外周面 4,5 補強層
4a,5a 螺旋状補強材 6 補強線材
A1 軸方向端部 A2 外周面(パイプ外周面)
A3 軸方向先端面(パイプ先端面) A4 内周面(パイプ内周面)
B 継手管 B1 内周面(継手内周面)
B2 段部(継手段部) B3 端面
C 流動規制手段 C1 封止カバー
C1′ 挟持部 C2,C3 貯留部
R 溶融樹脂
Claims (4)
- 複数の層(1,2)を積層してパイプ本体(A′)が形成され、これら複数の層(1,2)の間に補強材を螺旋状に巻回して補強層が形成される合成樹脂パイプにおいて、
前記複数の層(1,2)の間に接着層(3)を形成し、前記複数の層(1,2)の各々の層と接着層(3)との間に、前記補強材として螺旋状補強材(4a,5a)を夫々の傾斜角度が逆向きになるように螺旋状に巻回することで、前記接着層(3)の内周面及び外周面に沿って前記補強層(4,5)を夫々形成したことを特徴とする合成樹脂パイプ。 - 前記複数の層(1,2)を熱可塑性樹脂で形成するとともに、これら複数の層(1,2)の熱可塑性樹脂よりも流動性の高い熱可塑性樹脂で前記接着層(3)を形成した請求項1記載の合成樹脂パイプ。
- 請求項1又は請求項2記載の合成樹脂パイプを製造するに際し、前記接着層(3)を積層した後に冷却し、この冷却工程の後に前記接着層(3)の外周面に沿って螺旋状補強材(5a)を螺旋状に巻回したことを特徴とする合成樹脂パイプを製造方法。
- 請求項1又は請求項2記載の合成樹脂パイプを接続するに際し、前記複数の層(1,2)及び接着層(3)と螺旋状補強材(4a,5a)が同系の合成樹脂で形成されてなる前記パイプ本体(A′)の軸方向端部(A1)を加熱溶融し、接続相手に圧接させて熱溶着したことを特徴とする合成樹脂パイプの接続方法。
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