JP2012016847A - Method and apparatus for manufacturing double pipe - Google Patents

Method and apparatus for manufacturing double pipe Download PDF

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Publication number
JP2012016847A
JP2012016847A JP2010154339A JP2010154339A JP2012016847A JP 2012016847 A JP2012016847 A JP 2012016847A JP 2010154339 A JP2010154339 A JP 2010154339A JP 2010154339 A JP2010154339 A JP 2010154339A JP 2012016847 A JP2012016847 A JP 2012016847A
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Prior art keywords
tube
pipe
double
sheath
manufacturing
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Norihiro Furukawa
悟弘 古川
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Bridgestone Corp
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Bridgestone Corp
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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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-shaped
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • B29C48/913—Cooling of hollow articles of tubular films externally
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the material

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a double pipe by molding an outer pipe by extrusion molding around an inner pipe so that the outer pipe can be peeled off from the inner tube, and to provide an apparatus for manufacturing the same.SOLUTION: The double pipe having a gap between the inner pipe 24 and the outer pipe 30 is manufactured by feeding a gas Q into a gap between the inner pipe 24 and the outer pipe 30 while extruding the outer pipe 30 to the circumference of the inner pipe 24 by a first mold 12. Thereby the extruded and molded outer pipe 30 can be prevented from adhering to and being integrated with the inner pipe 24.

Description

本発明は、内管と外管とによって構成される二重管の製造方法、及び二重管の製造装置に関する。   The present invention relates to a method for manufacturing a double pipe constituted by an inner pipe and an outer pipe, and an apparatus for manufacturing a double pipe.

二重管の製造方法として、予め成形された合成樹脂製の内管の周囲に外管を押出成形することにより二重管を製造する方法が挙げられる。
しかし、この方法は、外管を押出成形する金型内で内管と外管とが溶融されて一体化することにより外管の端部が内管から剥離できなくなり、これによって、管継手に内管を接続できなくなることが懸念される。 As a method for producing a double tube, a method for producing a double tube by extruding an outer tube around a pre-formed inner tube made of synthetic resin can be mentioned.
However, in this method, the inner tube and the outer tube are melted and integrated in a mold for extruding the outer tube, so that the end portion of the outer tube cannot be peeled off from the inner tube. There is a concern that the inner pipe cannot be connected.

特許文献１の二重管の製造方法では、合成樹脂製の内管の周囲に、内管の外周面に接する突起を内周面に有する合成樹脂製の鞘管を押出成形して、二重管を製造している。よって、突起により、内管の外周面と、鞘管の内周面との間に隙間を設けることができ、内管と鞘管とが一体化するのを防ぐことができる。
しかし、先鋭的な断面形状の突起を鞘管の内周面に形成するために、合成樹脂製の鞘管を押出成形するダイの金型形状が複雑になり、ダイの製作が面倒である。 In the method of manufacturing a double pipe disclosed in Patent Document 1, a synthetic resin sheath pipe having a protrusion on the inner peripheral surface that is in contact with the outer peripheral surface of the inner pipe is extruded around the inner pipe made of synthetic resin. Manufactures tubes. Therefore, the protrusion can provide a gap between the outer peripheral surface of the inner tube and the inner peripheral surface of the sheath tube, and can prevent the inner tube and the sheath tube from being integrated.
However, since the sharp cross-sectional protrusion is formed on the inner peripheral surface of the sheath tube, the die shape of the die for extruding the synthetic resin sheath tube becomes complicated, and the manufacture of the die is troublesome.

特開平１０−１９３４２７号公報JP-A-10-193427

本発明は係る事実を考慮し、内管に対して外管が剥離可能となるように内管の周囲に外管を押出成形することができる二重管の製造方法、及び二重管の製造装置を提供することを課題とする。   In consideration of such facts, the present invention provides a method for manufacturing a double tube that can extrude an outer tube around the inner tube so that the outer tube can be peeled from the inner tube, and manufacture of the double tube. It is an object to provide an apparatus.

請求項１に記載の発明は、合成樹脂製の内管の周囲に合成樹脂製の外管を第１金型により押し出すとともに、前記内管と前記外管との間に気体を送り込む二重管の製造方法である。   The invention according to claim 1 is a double pipe in which a synthetic resin outer pipe is pushed out around a synthetic resin inner pipe by a first mold and gas is fed between the inner pipe and the outer pipe. It is a manufacturing method.

請求項１に記載の発明では、内管と外管との間に気体を送り込みながら、第１金型により内管の周囲に外管を押し出すことにより、内管と外管との間に隙間を有する二重管を製造することができる。   In the first aspect of the present invention, a gap is formed between the inner tube and the outer tube by pushing the outer tube around the inner tube by the first mold while feeding gas between the inner tube and the outer tube. Can be produced.

これにより、押し出された外管が内管にくっ付いて内管と外管とが一体化されるのを防ぐことができ、管継手等への内管の接続に際して、外管の端部を内管から剥離させることができる。   As a result, it is possible to prevent the extruded outer pipe from sticking to the inner pipe and integrating the inner pipe and the outer pipe. It can be peeled from the inner tube.

請求項２に記載の発明は、前記外管の押し出しと並行して前記内管を第２金型により押し出す。   According to a second aspect of the present invention, the inner pipe is pushed out by the second mold in parallel with the pushing out of the outer pipe.

請求項２に記載の発明では、外管の押し出しと並行して、第２金型により内管を押し出す。すなわち、内管と外管とが並行して成形されるので、効率よく二重管を製造することができる。   In the invention according to claim 2, the inner tube is extruded by the second mold in parallel with the extrusion of the outer tube. That is, since the inner tube and the outer tube are molded in parallel, a double tube can be manufactured efficiently.

例えば、建物の床上に敷設された外管へ内管を挿入することにより二重管を構成する場合、外管へ内管を挿入する作業が煩雑になる。
また、例えば、一定期間の養生が済んだ内管の周囲に外管を押し出して二重管を製造する場合には、一定期間の養生が済んだ内管を第１金型に挿入する為に巻き取る作業と、製造された二重管を巻き取る作業との２回の巻き取り作業を行なわなければならないが、本発明の二重管の製造方法では、製造された二重管を巻き取る作業を１回行なうだけでよい。 For example, when a double pipe is configured by inserting an inner pipe into an outer pipe laid on the floor of a building, the operation of inserting the inner pipe into the outer pipe becomes complicated.
For example, when a double pipe is manufactured by pushing an outer pipe around an inner pipe that has been cured for a certain period, the inner pipe that has been cured for a certain period is inserted into the first mold. Two winding operations, a winding operation and a winding operation for the manufactured double tube, must be performed. In the method for manufacturing a double tube of the present invention, the manufactured double tube is wound. You only need to do the work once.

請求項３に記載の発明は、前記気体は、冷却されている。   According to a third aspect of the present invention, the gas is cooled.

請求項３に記載の発明では、冷却された気体により、第１金型により押し出された外管を冷却することができる。   In the invention described in claim 3, the outer tube pushed out by the first mold can be cooled by the cooled gas.

請求項４に記載の発明は、合成樹脂製の内管が通過する通過部を有し該通過部を通過する前記内管の周囲に合成樹脂製の外管を押し出す第１金型と、前記第１金型による前記外管の押し出しとともに前記内管と前記外管との間に気体を送り込む送気装置と、を有する二重管の製造装置である。   The invention according to claim 4 includes a first mold that has a passage portion through which an inner tube made of synthetic resin passes and pushes an outer tube made of synthetic resin around the inner tube that passes through the passage portion, It is an apparatus for producing a double pipe having an air feeding device for feeding gas between the inner pipe and the outer pipe together with the extrusion of the outer pipe by a first mold.

請求項４に記載の発明では、二重管の製造装置が、第１金型及び送気装置を有している。第１金型は、合成樹脂製の内管が通過する通過部を有している。そして、この通過部を通過する内管の周囲に合成樹脂製の外管を押し出す。送気装置は、第１金型による外管の押し出しとともに、内管と外管との間に気体を送り込む。   In a fourth aspect of the invention, the double pipe manufacturing apparatus includes the first mold and the air supply device. The first mold has a passage portion through which an inner tube made of synthetic resin passes. Then, an outer tube made of a synthetic resin is pushed out around the inner tube passing through the passage portion. The air feeding device feeds the gas between the inner tube and the outer tube while pushing the outer tube by the first mold.

よって、内管と外管との間に気体を送り込みながら、第１金型により内管の周囲に外管を押し出すことにより、内管と外管との間に隙間を有する二重管を製造することができる。
これにより、押し出された外管が内管にくっ付いて内管と外管とが一体化されるのを防ぐことができ、管継手等への内管の接続に際して、外管の端部を内管から剥離させることができる。 Therefore, a double pipe having a gap between the inner pipe and the outer pipe is manufactured by pushing the outer pipe around the inner pipe by the first mold while feeding gas between the inner pipe and the outer pipe. can do.
As a result, it is possible to prevent the extruded outer pipe from sticking to the inner pipe and integrating the inner pipe and the outer pipe. It can be peeled from the inner tube.

本発明は上記構成としたので、内管に対して外管が剥離可能となるように内管の周囲に外管を押出成形することができる。   Since the present invention is configured as described above, the outer tube can be extruded around the inner tube so that the outer tube can be peeled from the inner tube.

本発明の実施形態に係る二重管の製造装置を示す説明図である。It is explanatory drawing which shows the manufacturing apparatus of the double tube | pipe which concerns on embodiment of this invention. 図１のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 本発明の実施形態に係る二重管の斜視図である。It is a perspective view of the double pipe concerning the embodiment of the present invention. 本発明の実施形態に係る二重管の製造装置の変形例を示す説明図である。It is explanatory drawing which shows the modification of the manufacturing apparatus of the double pipe | tube which concerns on embodiment of this invention.

図を参照しながら、本発明の実施形態を説明する。
まず、本発明の実施形態である二重管の製造装置について説明する。 Embodiments of the present invention will be described with reference to the drawings.
First, the manufacturing apparatus of the double pipe which is embodiment of this invention is demonstrated.

図１に示すように、二重管の製造装置１０は、第１金型としてのダイ１２、第２金型としてのダイ１４、送気装置としてのエアーコンプレッサー１６、冷却手段としての冷却槽１８、２０、及び引張手段としての引張装置２２を有している。以下、ダイ１４から引張装置２２へ向かう方向を製造方向Ｙとする。ダイ１４、冷却槽１８、エアーコンプレッサー１６、ダイ１２、冷却槽２０、及び引張装置２２は、製造方向Ｙに対してこの順に配置されている。   As shown in FIG. 1, a double tube manufacturing apparatus 10 includes a die 12 as a first mold, a die 14 as a second mold, an air compressor 16 as an air supply device, and a cooling tank 18 as a cooling means. , 20 and a tension device 22 as a tension means. Hereinafter, the direction from the die 14 toward the tensioning device 22 is referred to as a manufacturing direction Y. The die 14, the cooling tank 18, the air compressor 16, the die 12, the cooling tank 20, and the tension device 22 are arranged in this order with respect to the manufacturing direction Y.

ダイ１４では、合成樹脂としてのポリブテンを、溶融した状態で製造方向Ｙへ円筒状に押し出して内管２４を形成する。すなわち、ダイ１４により、内管２４が押出成形される。   In the die 14, the inner tube 24 is formed by extruding polybutene as a synthetic resin in a cylindrical shape in the production direction Y in a molten state. That is, the inner tube 24 is extruded by the die 14.

冷却槽１８には、冷却水Ｗが溜められており、この冷却槽１８を通過する内管２４を冷却する。   Cooling water W is stored in the cooling tank 18, and the inner pipe 24 passing through the cooling tank 18 is cooled.

ダイ１２には、ダイ１４により押し出された内管２４が通過する通過部としての貫通孔２６が形成されている。すなわち、ダイ１２は、ダイ１４により押し出された内管２４が貫通孔２６に挿入されるように配置されている。   A through hole 26 is formed in the die 12 as a passing portion through which the inner tube 24 pushed out by the die 14 passes. That is, the die 12 is arranged such that the inner tube 24 pushed out by the die 14 is inserted into the through hole 26.

そして、ダイ１２では、合成樹脂としての熱可塑性エラストマーを、溶融した状態で製造方向Ｙへ円筒状に押し出して、貫通孔２６を通過する内管２４の周囲に所定の隙間２８を有した状態で外管としての鞘管３０を形成する。すなわち、ダイ１２により、鞘管３０が押出成形される。   In the die 12, a thermoplastic elastomer as a synthetic resin is extruded in a cylindrical shape in the production direction Y in a molten state, and a predetermined gap 28 is provided around the inner tube 24 passing through the through hole 26. A sheath tube 30 is formed as an outer tube. That is, the sheath tube 30 is extruded by the die 12.

また、ダイ１２では、鞘管３０の押し出しとともに、エアーコンプレッサー１６から加圧した気体としての空気Ｑが、内管２４と鞘管３０との間の隙間２８に送り込まれる。すなわち、内管２４と鞘管３０との間に空気層を形成した状態で、内管２４の周囲に鞘管３０が押出成形される。   Further, in the die 12, the air Q as a gas pressurized from the air compressor 16 is sent into the gap 28 between the inner tube 24 and the sheath tube 30 as the sheath tube 30 is pushed out. That is, the sheath tube 30 is extruded around the inner tube 24 in a state where an air layer is formed between the inner tube 24 and the sheath tube 30.

冷却槽２０には、冷却水Ｗが溜められており、この冷却槽２０を通過する鞘管３０を冷却する。   Cooling water W is stored in the cooling tank 20, and the sheath tube 30 passing through the cooling tank 20 is cooled.

引張装置２２では、図１のＡ−Ａ断面図である図２に示すように、鞘管３０の上下に配置された一対の回転ベルト３２、３４により、鞘管３０の内周面が内管２４の外周面に接触するまで鞘管３０を挟み込み、この状態で回転ベルト３２、３４を回転させて、鞘管３０と内管２４とを製造方向Ｙへ同時に引っ張る。冷却槽２０で冷却された熱可塑性エラストマー（鞘管３０）は可撓性を有するので、鞘管３０を変形させて、鞘管３０の内周面を内管２４の外周面に接触するように鞘管３０を変形させることができる。   In the tension device 22, as shown in FIG. 2 which is a cross-sectional view taken along the line AA in FIG. 1, the inner peripheral surface of the sheath tube 30 is an inner tube by a pair of rotating belts 32 and 34 disposed above and below the sheath tube 30. The sheath tube 30 is sandwiched until it comes into contact with the outer peripheral surface of 24, and in this state, the rotating belts 32 and 34 are rotated, and the sheath tube 30 and the inner tube 24 are simultaneously pulled in the manufacturing direction Y. Since the thermoplastic elastomer (sheath tube 30) cooled in the cooling tank 20 has flexibility, the sheath tube 30 is deformed so that the inner peripheral surface of the sheath tube 30 contacts the outer peripheral surface of the inner tube 24. The sheath tube 30 can be deformed.

次に、本発明の実施形態である二重管の製造方法について説明する。   Next, the manufacturing method of the double pipe which is embodiment of this invention is demonstrated.

二重管の製造方法では、図１で示した二重管の製造装置１０によって二重管を製造する。
まず、ダイ１４により、溶融した状態のポリブテンを製造方向Ｙへ円筒状に押し出して内管２４を形成する（内管成形工程）。
次に、冷却槽１８を通過する内管２４を冷却する（内管冷却工程）。 In the double pipe manufacturing method, the double pipe is manufactured by the double pipe manufacturing apparatus 10 shown in FIG.
First, the melted polybutene is extruded in a cylindrical shape in the production direction Y by the die 14 to form the inner tube 24 (inner tube forming step).
Next, the inner pipe 24 passing through the cooling bath 18 is cooled (inner pipe cooling step).

次に、ダイ１２により、溶融した状態の熱可塑性エラストマーを製造方向Ｙへ円筒状に押し出して、貫通孔２６を通過する内管２４の周囲に所定の隙間２８を有した状態で外管としての鞘管３０を形成し（鞘管成形工程）、鞘管成形工程とともに、内管２４と鞘管３０との間に加圧した空気Ｑを送り込む（送気工程）。すなわち、ダイ１４による内管２４の押し出しと、ダイ１２による鞘管３０の押し出しとが並行して行なわれる。
なお、加圧した空気Ｑは、内管２４及び鞘管３０が冷却槽２０を通過し終える地点付近まで、加圧された状態とすることが好ましい。 Next, the die 12 is used to extrude the molten thermoplastic elastomer in the manufacturing direction Y in a cylindrical shape, and as an outer tube with a predetermined gap 28 around the inner tube 24 passing through the through hole 26. The sheath tube 30 is formed (sheath tube forming step), and the pressurized air Q is fed between the inner tube 24 and the sheath tube 30 together with the sheath tube forming step (air supply step). That is, the extrusion of the inner tube 24 by the die 14 and the extrusion of the sheath tube 30 by the die 12 are performed in parallel.
The pressurized air Q is preferably in a pressurized state up to the vicinity of the point where the inner tube 24 and the sheath tube 30 finish passing through the cooling bath 20.

次に、冷却槽２０を通過する鞘管３０を冷却する（鞘管冷却工程）。
次に、一対の回転ベルト３２、３４により、鞘管３０の内周面が内管２４の外周面に接触するまで鞘管３０を挟み込み、この状態で回転ベルト３２、３４を回転させて鞘管３０と内管２４とを製造方向Ｙへ同時に引っ張る（引張工程）。例えば、引張装置２２により、鞘管３０と内管２４とを毎分５ｍ程度の速度で引っ張る。 Next, the sheath tube 30 passing through the cooling bath 20 is cooled (sheath tube cooling step).
Next, the sheath tube 30 is sandwiched between the pair of rotating belts 32 and 34 until the inner peripheral surface of the sheath tube 30 contacts the outer peripheral surface of the inner tube 24. In this state, the rotating belts 32 and 34 are rotated to rotate the sheath tube. 30 and the inner tube 24 are simultaneously pulled in the production direction Y (tensile step). For example, the pulling device 22 pulls the sheath tube 30 and the inner tube 24 at a speed of about 5 m / min.

そして、これらの工程（内管成形工程、内管冷却工程、鞘管成形工程、送気工程、鞘管冷却工程、引張工程）を連続的に繰り返すことにより、図３（ａ）の斜視図に示す二重管３６を製造することができる。二重管３６は、合成樹脂製の内管２４と、内管２４の周囲に設けられた合成樹脂製の鞘管３０とによって構成されている。内管２４の外周面、及び鞘管３０の内周面は、面一に形成されており、内管２４の外周面と、鞘管３０の内周面との間に隙間を有している。   And by repeating these steps (inner tube forming step, inner tube cooling step, sheath tube forming step, air feeding step, sheath tube cooling step, tension step) continuously, the perspective view of FIG. The shown double tube 36 can be manufactured. The double pipe 36 includes a synthetic resin inner pipe 24 and a synthetic resin sheath pipe 30 provided around the inner pipe 24. The outer peripheral surface of the inner tube 24 and the inner peripheral surface of the sheath tube 30 are formed flush with each other, and there is a gap between the outer peripheral surface of the inner tube 24 and the inner peripheral surface of the sheath tube 30. .

二重管３６は、内管２４の外周面と鞘管３０の内周面との間の空気層によって、内管２４内を流れる流体に対して保温効果を発揮することができ、また、鞘管３０によって内管２４が保護される耐外傷性に優れた構造となっている。   The double pipe 36 can exert a heat retaining effect on the fluid flowing in the inner pipe 24 by the air layer between the outer peripheral face of the inner pipe 24 and the inner peripheral face of the sheath pipe 30, and the sheath The inner tube 24 is protected by the tube 30 and has a structure with excellent external resistance.

次に、本発明の実施形態の二重管の製造装置及び二重管の製造方法の作用及び効果について説明する。   Next, the operation and effect of the double pipe manufacturing apparatus and the double pipe manufacturing method of the embodiment of the present invention will be described.

図１で示したように、本発明の実施形態の二重管の製造装置１０及び二重管の製造方法では、内管２４と鞘管３０との間に加圧した空気Ｑを送り込みながら、ダイ１２により内管２４の周囲に鞘管３０を押し出すことにより、内管２４の外周面と鞘管３０の内周面との間に隙間を有する二重管３６を製造することができる。   As shown in FIG. 1, in the double pipe manufacturing apparatus 10 and the double pipe manufacturing method of the embodiment of the present invention, while sending pressurized air Q between the inner pipe 24 and the sheath pipe 30, By pushing the sheath tube 30 around the inner tube 24 by the die 12, the double tube 36 having a gap between the outer peripheral surface of the inner tube 24 and the inner peripheral surface of the sheath tube 30 can be manufactured.

これにより、押し出された鞘管３０が内管２４にくっ付いて内管２４と鞘管３０とが一体化されるのを防ぐことができ、管継手等への内管２４の接続に際して、図３（ｂ）の斜視図に示すように、鞘管３０の端部を内管２４から剥離させることができる。   As a result, the extruded sheath tube 30 can be prevented from sticking to the inner tube 24 and the inner tube 24 and the sheath tube 30 can be prevented from being integrated, and when the inner tube 24 is connected to a pipe joint or the like, As shown in the perspective view of FIG. 3 (b), the end portion of the sheath tube 30 can be peeled from the inner tube 24.

また、ダイ１２による鞘管３０の押し出しと並行して、ダイ１４により内管２４を押し出す。すなわち、内管２４と鞘管３０とが並行して成形されるので、効率よく二重管３６を製造することができる。   In parallel with the extrusion of the sheath tube 30 by the die 12, the inner tube 24 is extruded by the die 14. That is, since the inner tube 24 and the sheath tube 30 are formed in parallel, the double tube 36 can be manufactured efficiently.

例えば、建物の床上に敷設された鞘管（外管）へ内管を挿入することにより二重管を構成する場合、鞘管へ内管を挿入する作業が煩雑になる。また、例えば、ダイにより、一定期間の養生が済んだ内管の周囲に鞘管を押し出して二重管を製造する場合には、一定期間の養生が済んだ内管をダイに挿入する為に巻き取る作業と、製造された二重管を巻き取る作業との２回の巻き取り作業を行なわなければならないが、本発明の二重管の製造方法では、製造された二重管を巻き取る作業を１回行なうだけでよい。   For example, when a double pipe is configured by inserting an inner pipe into a sheath pipe (outer pipe) laid on the floor of a building, the operation of inserting the inner pipe into the sheath pipe becomes complicated. For example, when a double pipe is manufactured by extruding a sheath pipe around an inner pipe that has been cured for a certain period by a die, the inner pipe that has been cured for a certain period is inserted into the die. Two winding operations, a winding operation and a winding operation for the manufactured double tube, must be performed. In the method for manufacturing a double tube of the present invention, the manufactured double tube is wound. You only need to do the work once.

また、内管２４の外周面と鞘管３０の内周面との間に送り込まれる加圧した空気Ｑにより、内管２４及び鞘管３０を冷却することができる。この冷却効果を高めるために、加圧し冷却した空気Ｑを内管２４の外周面と鞘管３０の内周面との間に送り込むようにしてもよい。ダイ１２により内管２４の周囲に押し出される溶融した状態の熱可塑性エラストマーの流動性が低下することが懸念される場合には、例えば、図４に示すように、隙間２８を２つの層２８Ａ、２８Ｂに分け、内管２４に面する層２８Ａに冷却した空気Ｑ１を送り込み、鞘管３０に面する層２８Ｂに、層２８Ａの空気Ｑ１よりも高い（熱可塑性エラストマーの流動性を考慮した）温度の空気Ｑ２を送り込むようにすればよい。 Further, the inner tube 24 and the sheath tube 30 can be cooled by the pressurized air Q sent between the outer peripheral surface of the inner tube 24 and the inner peripheral surface of the sheath tube 30. In order to enhance this cooling effect, pressurized and cooled air Q may be sent between the outer peripheral surface of the inner tube 24 and the inner peripheral surface of the sheath tube 30. In the case where there is a concern that the fluidity of the molten thermoplastic elastomer extruded by the die 12 around the inner tube 24 is lowered, for example, as shown in FIG. divided 28B, feeding air Q 1 cooling the layer 28A facing the inner tube 24, the layer 28B facing the sheath tube 30, taking into account the fluidity of higher than air to Q 1 layer 28A (thermoplastic elastomer ) it is sufficient to send the air Q 2 temperature.

また、二重管の製造装置１０では、ダイ１２を複雑な金型形状にしなくてよく、空気Ｑの流路と貫通孔２６とをダイに設ければよい。すなわち、ダイの加工手間を低減し、二重管の製造装置の低コスト化を図ることができる。   Further, in the double-pipe manufacturing apparatus 10, the die 12 does not need to have a complicated mold shape, and the air Q channel and the through hole 26 may be provided in the die. That is, it is possible to reduce the labor for processing the die and to reduce the cost of the double pipe manufacturing apparatus.

以上、本発明の実施形態について説明した。   The embodiment of the present invention has been described above.

なお、本発明の実施形態では、内管２４の材料をポリブテンとした例を示したが、熱可塑性を有する合成樹脂であればよく、例えば、ポリエチレン、架橋ポリエチレン、ポリプロピレン、熱可塑性エラストマー等としてもよい。   In the embodiment of the present invention, an example in which the material of the inner tube 24 is polybutene has been shown. However, any synthetic resin having thermoplasticity may be used, for example, polyethylene, crosslinked polyethylene, polypropylene, thermoplastic elastomer, etc. Good.

また、本発明の実施形態では、鞘管３０の材料を熱可塑性エラストマーとした例を示したが、熱可塑性を有し、且つ冷却槽２０で冷却された後に弾性を有する合成樹脂であればよい。   Further, in the embodiment of the present invention, an example in which the material of the sheath tube 30 is a thermoplastic elastomer has been shown. However, any synthetic resin having thermoplasticity and elasticity after being cooled in the cooling bath 20 may be used. .

また、本発明の実施形態では、加圧した空気Ｑを、内管２４と鞘管３０との間の隙間２８に送り込む例を示したが、空気Ｑの圧力は、鞘管３０の肉厚を考慮した大きさに設定する必要があり、０．０３ＭＰａ以上０．３ＭＰａ以下とするのが好ましい。   In the embodiment of the present invention, the pressurized air Q is sent into the gap 28 between the inner tube 24 and the sheath tube 30. However, the pressure of the air Q is the thickness of the sheath tube 30. It is necessary to set the size in consideration, and it is preferable that the size is 0.03 MPa or more and 0.3 MPa or less.

例えば、鞘管３０の肉厚を２．０ｍｍとし、空気Ｑの圧力を０．０１ＭＰａ以下とした場合、鞘管３０の自重で鞘管３０の内周面が内管２４の外周面に接触して、くっ付いてしまうことが懸念される。
また、例えば、鞘管３０の肉厚を０．５ｍｍとし、空気Ｑの圧力を０．５ＭＰａとした場合、鞘管３０が空気圧によって膨らみ破裂してしまうことが懸念される。 For example, when the thickness of the sheath tube 30 is 2.0 mm and the pressure of the air Q is 0.01 MPa or less, the inner peripheral surface of the sheath tube 30 comes into contact with the outer peripheral surface of the inner tube 24 by its own weight. I am concerned that they will stick together.
For example, when the thickness of the sheath tube 30 is 0.5 mm and the pressure of the air Q is 0.5 MPa, there is a concern that the sheath tube 30 may swell and burst due to air pressure.

また、本発明の実施形態では、一対の回転ベルト３２、３４を上下に配置して鞘管３０を挟み込んだ例を示したが、一対の回転ベルト３２、３４を左右や斜めに配置して、鞘管３０を挟み込むようにしてもよい。また、１つの回転ベルトのみによって引張装置２２を構成し、この回転ベルトを、鞘管３０の内周面が内管２４の外周面に接触するまで鞘管３０に押し付けるようにしてもよい。また、３つ以上の回転ベルトによって鞘管３０を挟み込むようにしてもよい。   Further, in the embodiment of the present invention, an example in which the pair of rotating belts 32 and 34 are arranged up and down and the sheath tube 30 is sandwiched is shown, but the pair of rotating belts 32 and 34 are arranged left and right or obliquely, The sheath tube 30 may be sandwiched. Alternatively, the tensioning device 22 may be constituted by only one rotating belt, and this rotating belt may be pressed against the sheath tube 30 until the inner peripheral surface of the sheath tube 30 contacts the outer peripheral surface of the inner tube 24. Further, the sheath tube 30 may be sandwiched between three or more rotating belts.

また、本発明の実施形態では、冷却槽１８により内管２４が冷却され、冷却槽２０により鞘管３０が冷却される例を示したが、冷却槽２０により内管２４が冷却されることも期待できる。よって、冷却槽２０により鞘管３０及び内管２４を十分に冷却できる場合には、冷却槽１８は無くてもよい。   Further, in the embodiment of the present invention, the example in which the inner pipe 24 is cooled by the cooling tank 18 and the sheath pipe 30 is cooled by the cooling tank 20 has been shown, but the inner pipe 24 may be cooled by the cooling tank 20. I can expect. Therefore, when the sheath tube 30 and the inner tube 24 can be sufficiently cooled by the cooling bath 20, the cooling bath 18 may be omitted.

また、本発明の実施形態では、水冷（冷却水Ｗ）により、冷却槽１８、２０で内管２４や鞘管３０を冷却する例を示したが、空冷等の他の冷却方法によって内管２４や鞘管３０を冷却してもよい。   In the embodiment of the present invention, the inner tube 24 and the sheath tube 30 are cooled by the cooling tanks 18 and 20 by water cooling (cooling water W). However, the inner tube 24 is cooled by other cooling methods such as air cooling. Or the sheath tube 30 may be cooled.

また、本発明の実施形態では、ダイ１４により押し出された内管２４の周囲に、ダイ１２により鞘管３０を押し出す例を示したが、一定期間養生された合成樹脂製の内管（例えば、ポリブテン管）をダイ１２の貫通孔２６に挿入して、この内管の周囲に鞘管３０を押し出すようにしてもよい。   Further, in the embodiment of the present invention, an example in which the sheath tube 30 is pushed out by the die 12 around the inner tube 24 pushed out by the die 14 is shown. A polybutene tube) may be inserted into the through hole 26 of the die 12 and the sheath tube 30 may be pushed out around the inner tube.

また、本発明の実施形態では、内管２４と鞘管３０との間の隙間２８に送り込む気体を空気Ｑとしたが、気体であればよく、例えば、窒素や酸素等の気体を内管２４と鞘管３０との間の隙間２８に送り込むようにしてもよい。   In the embodiment of the present invention, the gas sent into the gap 28 between the inner tube 24 and the sheath tube 30 is air Q. However, any gas such as nitrogen or oxygen may be used. It is also possible to feed the gap 28 between the tube and the sheath tube 30.

また、本発明の実施形態では、円筒状の内管２４及び鞘管３０により構成される二重管３６を製造する二重管の製造装置及び二重管の製造方法について示したが、他の横断面形状を有する二重管（例えば、角筒状の内管及び鞘管により構成される二重管）へ、本発明の実施形態で示した二重管の製造装置及び二重管の製造方法を適用してもよい。   In the embodiment of the present invention, the double pipe manufacturing apparatus and the double pipe manufacturing method for manufacturing the double pipe 36 constituted by the cylindrical inner pipe 24 and the sheath pipe 30 have been described. Double pipe manufacturing apparatus and double pipe manufacturing shown in the embodiment of the present invention to a double pipe having a cross-sectional shape (for example, a double pipe constituted by a rectangular tube-shaped inner tube and a sheath tube) A method may be applied.

以上、本発明の実施形態について説明したが、本発明はこうした実施形態に何等限定されるものでなく、本発明の要旨を逸脱しない範囲において、種々なる態様で実施し得ることは勿論である。   As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, in the range which does not deviate from the summary of this invention, it can implement in a various aspect.

１０ 二重管の製造装置
１２ ダイ（第１金型）
１４ ダイ（第２金型）
１６ エアーコンプレッサー（送気装置）
２４ 内管
２６ 管通孔（通過部）
３０ 鞘管（外管）
Ｑ 空気（気体） 10 Double pipe manufacturing equipment 12 Die (first mold)
14 Die (second mold)
16 Air compressor (air supply device)
24 Inner pipe 26 Pipe hole (passage)
30 Sheath tube (outer tube)
Q Air (gas)

Claims (4)

合成樹脂製の内管の周囲に合成樹脂製の外管を第１金型により押し出すとともに、前記内管と前記外管との間に気体を送り込む二重管の製造方法。   A method of manufacturing a double pipe in which a synthetic resin outer pipe is pushed out around a synthetic resin inner pipe by a first mold and gas is fed between the inner pipe and the outer pipe. 前記外管の押し出しと並行して前記内管を第２金型により押し出す請求項１に記載の二重管の製造方法。   The manufacturing method of the double pipe | tube of Claim 1 which extrudes the said inner pipe | tube with a 2nd metal mold | die in parallel with extrusion of the said outer pipe | tube. 前記気体は、冷却されている請求項１又は２に記載の二重管の製造方法。   The method for manufacturing a double pipe according to claim 1, wherein the gas is cooled. 合成樹脂製の内管が通過する通過部を有し該通過部を通過する前記内管の周囲に合成樹脂製の外管を押し出す第１金型と、
前記第１金型による前記外管の押し出しとともに前記内管と前記外管との間に気体を送り込む送気装置と、
を有する二重管の製造装置。 A first mold that has a passage part through which the inner pipe made of synthetic resin passes and pushes the outer pipe made of synthetic resin around the inner pipe passing through the passage part;
An air supply device for sending gas between the inner tube and the outer tube together with the extrusion of the outer tube by the first mold;
An apparatus for manufacturing a double tube.
JP2010154339A 2010-07-06 2010-07-06 Method and apparatus for manufacturing double pipe Pending JP2012016847A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017194078A (en) * 2016-04-18 2017-10-26 株式会社ディスコ Process of manufacture of double piping
JP2017226144A (en) * 2016-06-22 2017-12-28 株式会社ブリヂストン Manufacturing method of composite tube
WO2019196408A1 (en) * 2018-04-08 2019-10-17 烽火通信科技股份有限公司 Forming device and forming process for optical cable sheath of embedded rigid reinforced element

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017194078A (en) * 2016-04-18 2017-10-26 株式会社ディスコ Process of manufacture of double piping
JP2017226144A (en) * 2016-06-22 2017-12-28 株式会社ブリヂストン Manufacturing method of composite tube
WO2019196408A1 (en) * 2018-04-08 2019-10-17 烽火通信科技股份有限公司 Forming device and forming process for optical cable sheath of embedded rigid reinforced element

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