JP5912687B2 - Welding apparatus and welding method for thermoplastic resin tube - Google Patents

Welding apparatus and welding method for thermoplastic resin tube Download PDF

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JP5912687B2
JP5912687B2 JP2012052967A JP2012052967A JP5912687B2 JP 5912687 B2 JP5912687 B2 JP 5912687B2 JP 2012052967 A JP2012052967 A JP 2012052967A JP 2012052967 A JP2012052967 A JP 2012052967A JP 5912687 B2 JP5912687 B2 JP 5912687B2
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tube
laser light
thermoplastic resin
welding
heat sink
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JP2013184437A (en
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晏夫 黒▲崎▼
晏夫 黒▲崎▼
修二 舘
修二 舘
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Campus Create Co Ltd
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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
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • 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
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • 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
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1696—Laser beams making use of masks
    • 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
    • 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
    • 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
    • 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
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/245—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool the heat transfer being achieved contactless, e.g. by radiation
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/72—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by combined operations or combined techniques, e.g. welding and stitching
    • 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
    • B29C66/11—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
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • 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
    • 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
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81266—Optical properties, e.g. transparency, reflectivity
    • B29C66/81267—Transparent to electromagnetic radiation, e.g. to visible light
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • 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
    • B29C66/71—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 composition of the plastics material of the parts to be joined
    • 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
    • B29C66/731—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 intensive physical properties of the material of the parts to be joined
    • B29C66/7311—Thermal properties
    • B29C66/73115—Melting point
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps

Description

本発明は熱可塑性樹脂製チューブの溶着方法に関するものであり、さらに詳しくは、内外二重に嵌め合わされた２つの熱可塑性樹脂製のチューブを赤外線レーザー光の照射により溶着する装置と溶着方法に関する。   The present invention relates to a method for welding thermoplastic resin tubes, and more particularly to an apparatus and a welding method for welding two thermoplastic resin tubes fitted in an inner and outer double by irradiation with infrared laser light.

従来、赤外線レーザー光による熱可塑性樹脂部材の溶着方法として、例えば特許文献1に記載されたものが知られている。この方法は、支持体の上に２つの熱可塑性樹脂部材を重ね合せ、さらにその上に赤外線透過性固体を重ね合せて重合群を形成し、この重合群に対して赤外線透過性固体側から赤外線レーザー光を照射するものである。この場合、赤外線透過性固体と接触する熱可塑性樹脂部材の境界温度が相対的に低くなり、浸透した赤外線エネルギーにより、その内部でより高温となった領域を発現し得る。その結果、熱可塑性樹脂部材の赤外線レーザー光照射側の表層での熱損傷による表面性状の悪化が抑制される一方、２つの熱可塑性樹脂部材の境界温度が相対的に高くなって、短時間のうちにこの境界部分に溶着層を得ることができる。この方法は、透明な樹脂部材同士の溶着にも適用できる。   Conventionally, for example, a method described in Patent Document 1 is known as a method for welding a thermoplastic resin member using infrared laser light. In this method, two thermoplastic resin members are superposed on a support, and an infrared transmissive solid is superposed thereon to form a polymer group, and infrared rays are transmitted from the infrared transmissive solid side to the polymer group. Irradiates with laser light. In this case, the boundary temperature of the thermoplastic resin member that is in contact with the infrared transmissive solid is relatively low, and a region where the temperature is higher in the inside can be expressed by the penetrated infrared energy. As a result, deterioration of the surface property due to thermal damage on the surface layer of the thermoplastic resin member on the infrared laser light irradiation side is suppressed, while the boundary temperature between the two thermoplastic resin members becomes relatively high, A welded layer can be obtained at this boundary portion. This method can also be applied to welding of transparent resin members.

また、特許文献２にはこの方法の各種樹脂部材への適用実験例が示されており、樹脂チューブ溶着への応用として、軟質ポリオレフィンチューブとポリオレフィン成形体の嵌合部を回転機構を用いて溶着した実験例がある。   Further, Patent Document 2 shows an experimental example of application of this method to various resin members. As an application to resin tube welding, a fitting portion of a soft polyolefin tube and a polyolefin molded body is welded using a rotating mechanism. There are experimental examples.

特開２００９−１０１５６０号公報JP 2009-101560 A 特許第４２７９６７４号Japanese Patent No. 4279654

２つの異径の合成樹脂チューブ同士を嵌め合わせて赤外線レーザー光を照射して溶着するためには、チューブの回転機構やレーザースキャン機構などによりチューブの外周全体に赤外線レーザー光を照射することと、赤外線レーザー光照射による外挿チューブ表面の損傷を防ぐために固体ヒートシンクをチューブ回転に同期して移動させる付帯装置などが必要である。特に、極小チューブへ適用する場合には、精密なチューブ回転機構および固体ヒートシンク移動保持機構が必要となりコスト高となるなどの問題があった。   In order to fit two synthetic resin tubes with different diameters and irradiate them with infrared laser light to weld them, irradiate the entire outer periphery of the tube with infrared laser light using a tube rotation mechanism or laser scanning mechanism, In order to prevent damage to the surface of the extrapolated tube due to infrared laser light irradiation, an accessory device that moves the solid heat sink in synchronization with the rotation of the tube is required. In particular, when applied to a very small tube, there is a problem that a precise tube rotating mechanism and a solid heat sink moving and holding mechanism are required, resulting in high costs.

レーザー光照射による溶着以外の方法としては、接着剤による接着方法と、超音波振動の摩擦加熱による溶着方法があるが、前者は接着剤の化学的性質による用途の制限があり、後者は樹脂の種類、形状による制限があると共に、加工に比較的長時間を要する難点がある。   As a method other than welding by laser light irradiation, there are a bonding method using an adhesive and a welding method using frictional heating by ultrasonic vibration, but the former has application restrictions due to the chemical properties of the adhesive, and the latter is a resin. There are limitations due to the type and shape, and there is a problem that processing takes a relatively long time.

したがって、本発明は、レーザー光の吸収を高めるためにチューブを着色することなく、透明樹脂チューブ同士の溶着を可能とし、比較的小径の透明樹脂チューブについて、複雑なチューブ回転機構や高価なレーザースキャン機構を用いることなく、簡単な機構により、短時間で加工できる溶着装置と、それによる溶着方法を提供することを目的としている。   Therefore, the present invention enables welding of transparent resin tubes without coloring the tubes in order to enhance the absorption of the laser beam, and a complicated tube rotation mechanism or an expensive laser scan can be used for relatively small diameter transparent resin tubes. It aims at providing the welding apparatus which can be processed in a short time by a simple mechanism, without using a mechanism, and the welding method by it.

以下、添付図面の符号を参照して説明するが、本発明はこれに限定されるものではない。
上記課題を解決するための、本発明の溶着装置は、２つの異径の熱可塑性樹脂製チューブである外側チューブ１と内側チューブ２とを嵌め合わせた嵌合体３を支持する支持部材６と、外側チューブ１の外周側に接触するように配置される赤外線透過性の固体ヒートシンク７と、内側チューブ２の内周に接するように内側チューブ２内に挿入される金属棒又は金属チューブ５と、固体ヒートシンク７側に配置され、当該固体ヒートシンク７を通して嵌合体３に赤外線レーザー光４を照射するレーザー光源１１とを具備する。 Hereinafter, the present invention will be described with reference to the accompanying drawings, but the present invention is not limited thereto.
In order to solve the above problems, the welding apparatus of the present invention includes a support member 6 that supports a fitting body 3 in which an outer tube 1 and an inner tube 2 that are two different diameter thermoplastic resin tubes are fitted together, Infrared transparent solid heat sink 7 disposed so as to contact the outer periphery of outer tube 1, a metal rod or metal tube 5 inserted into inner tube 2 so as to contact the inner periphery of inner tube 2, and solid A laser light source 11 that is disposed on the heat sink 7 side and irradiates the fitting body 3 with the infrared laser light 4 through the solid heat sink 7 is provided.

また、本発明の溶着方法は、２つの異径の熱可塑性樹脂チューブである外側チューブ１と内側チューブ２とを嵌め合わせて嵌合体３を構成する工程と、小径チューブ２の内側にそれの内周に接するように金属棒又は金属チューブ５を挿入する工程と、嵌合体３を支持部材６上に支持する工程と、外側チューブ１の外周側に接触するように赤外線透過性の固体ヒートシンク７を配置する工程と、固体ヒートシンク７側のレーザー光源１１から当該固体ヒートシンク７を通して嵌合体３に赤外線レーザー光４を照射する工程とを含む。   Further, the welding method of the present invention includes a step of fitting the outer tube 1 and the inner tube 2 which are two different-diameter thermoplastic resin tubes to form the fitting body 3, A step of inserting a metal rod or metal tube 5 so as to be in contact with the periphery, a step of supporting the fitting body 3 on the support member 6, and an infrared transparent solid heat sink 7 so as to contact the outer peripheral side of the outer tube 1 And a step of irradiating the fitting body 3 with the infrared laser light 4 through the solid heat sink 7 from the laser light source 11 on the solid heat sink 7 side.

本発明によれば、内側チューブの内周に接触する金属棒または金属チューブが、樹脂を透過してきた赤外線レーザー光により加熱され、この熱を内外チューブの全周へ瞬間的に伝えることにより、内外チューブを短時間のうちに溶着できる。本発明によれば、チューブの回転または赤外線レーザー光をチューブ全周へスキャン照射する機構などを設けること無く、１点照射によるチューブの全周溶着を短時間で完了できる。   According to the present invention, the metal rod or metal tube that contacts the inner periphery of the inner tube is heated by the infrared laser light that has passed through the resin, and this heat is instantaneously transmitted to the entire periphery of the inner and outer tubes, thereby allowing the inner and outer tubes to Tubes can be welded in a short time. According to the present invention, the entire circumference welding of the tube by one-point irradiation can be completed in a short time without providing a mechanism for rotating the tube or scanning the entire circumference of the tube with infrared laser light.

合成樹脂製チューブの溶着時の嵌合状態を示す概略的斜視図である。It is a schematic perspective view which shows the fitting state at the time of welding of synthetic resin tubes. 合成樹脂製チューブの溶着装置の概略的縦断正面図である。It is a schematic longitudinal cross-sectional front view of the synthetic resin tube welding apparatus. 図２の溶着装置の概略的縦断側面図である。It is a schematic longitudinal side view of the welding apparatus of FIG.

以下、図面を参照してこの発明の実施の形態を説明する。
図１は、溶着しようとする異径の２つの熱可塑性樹脂製チューブ１，２を嵌め合わせて嵌合体３を構成した状態を示す。矢印は、赤外線レーザー光４の照射位置を示す。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a state in which a fitting body 3 is formed by fitting two thermoplastic resin tubes 1 and 2 having different diameters to be welded together. The arrow indicates the irradiation position of the infrared laser beam 4.

図２、３は、レーザービーム径と比較して小径の、外径３ｍｍ程度以下の熱可塑性樹脂チューブ１，２を内外二重に嵌め合わせた嵌合体３に、レーザー光源１１から赤外線レーザー光４を照射して溶着するときのモデル図である。   FIGS. 2 and 3 show the laser beam 4 from the laser light source 11 to the fitting body 3 in which the thermoplastic resin tubes 1 and 2 having an outer diameter of about 3 mm or less, which are smaller than the laser beam diameter, are fitted in an inner and outer double. It is a model figure when welding by irradiating.

チューブ１，２は、別の場所で冶具等を用いて、互いに密着するように嵌め合わされる。チューブ１，２の嵌合体３における内側チューブ２の内側に、それの内周面に密着するように、金属棒または金属チューブ５が挿入される。   The tubes 1 and 2 are fitted together so as to be in close contact with each other using a jig or the like in another place. A metal rod or metal tube 5 is inserted inside the inner tube 2 in the fitting body 3 of the tubes 1 and 2 so as to be in close contact with the inner peripheral surface thereof.

支持部材６上に、チューブ１，２の嵌合体３が配置され、赤外線レーザー光４の照射位置下に位置決めされる。ガラスのような赤外線透過性の固体ヒートシンク７が、赤外線レーザー光の照射前に、外側チューブ１へ接触するように位置調整機構８で位置決めされる。チューブ１と固体ヒートシンク７の接触面積により、赤外線レーザー加熱時のチューブ１から固体ヒートシンク７への放熱量が決まる。固体ヒートシンク７のチューブ１との接触部の形状は、平面、またはチューブ１の外径に適合した曲率カーブを持つ曲面である。固体ヒートシンク７の材質は、照射する赤外線レーザー光の波長を十分に透過させる透過率を有する光学固体材料を用いる。   The fitting body 3 of the tubes 1 and 2 is disposed on the support member 6 and is positioned below the irradiation position of the infrared laser light 4. An infrared transmissive solid heat sink 7 such as glass is positioned by a position adjusting mechanism 8 so as to come into contact with the outer tube 1 before irradiation with infrared laser light. The contact area between the tube 1 and the solid heat sink 7 determines the amount of heat released from the tube 1 to the solid heat sink 7 during infrared laser heating. The shape of the contact portion of the solid heat sink 7 with the tube 1 is a flat surface or a curved surface having a curvature curve adapted to the outer diameter of the tube 1. As the material of the solid heat sink 7, an optical solid material having a transmittance that sufficiently transmits the wavelength of the infrared laser light to be irradiated is used.

固体ヒートシンク７の上部には、マスク９が配置される。マスク９は、赤外線レーザー４のビーム径とチューブ１の径のとの差を調整し、レーザー光照射域を最適化するためのスリット９ａを有する。   A mask 9 is disposed on the solid heat sink 7. The mask 9 has a slit 9a for adjusting the difference between the beam diameter of the infrared laser 4 and the diameter of the tube 1 and optimizing the laser light irradiation area.

赤外線レーザー光４の強度、照射時間は、チューブ１，２の内部が溶融し、樹脂の組織結合が行われ、溶着域が得られる最適値に調整される。   The intensity and irradiation time of the infrared laser beam 4 are adjusted to optimum values at which the insides of the tubes 1 and 2 are melted, the resin is bonded to the tissue, and a weld zone is obtained.

赤外線レーザー光の照射が始まると、発熱部１０の領域で、チューブ１，２の樹脂に吸収された赤外線レーザー光のエネルギーに比例して温度上昇が始まると共に、樹脂を透過した赤外線レーザー光のエネルギーは金属棒５に吸収される。赤外線レーザー光の波長と金属棒５の材質、表面処理の状態により、金属棒５に吸収される光エネルギーは異なるが、一般的には、金属に吸収された光エネルギーは、比熱および質量に比例して金属の温度上昇を引き起こす。そして、金属の高い熱伝導率（樹脂の熱伝導率に比較すると、例えばアルミニウム（Ａl）の場合、約１００倍）で金属棒５の全体へ熱伝導し、全周が瞬時に温度上昇する。この金属棒５の熱により、チューブ１，２に対する赤外線レーザー光照射部以外の部位の樹脂も加熱溶着が可能となる。   When the irradiation of the infrared laser light starts, the temperature starts to increase in proportion to the energy of the infrared laser light absorbed by the resin of the tubes 1 and 2 in the region of the heat generating part 10, and the energy of the infrared laser light transmitted through the resin Is absorbed by the metal rod 5. The light energy absorbed by the metal rod 5 differs depending on the wavelength of the infrared laser beam, the material of the metal rod 5, and the surface treatment state. In general, the light energy absorbed by the metal is proportional to the specific heat and mass. Cause the metal temperature to rise. And heat conduction to the whole metal rod 5 with high heat conductivity of the metal (compared to the heat conductivity of resin, for example, about 100 times in the case of aluminum (Al)), the temperature of the entire circumference increases instantaneously. Due to the heat of the metal rod 5, the resin in the portion other than the infrared laser light irradiation portion on the tubes 1 and 2 can be heat-welded.

赤外線レーザー光の一点照射によって全周溶着が可能な上記した熱伝導バランスは、熱可塑性樹脂チューブ１，２の外径、肉厚および樹脂材料により適宜調整して見出すことができる。   The above-described heat conduction balance that can be welded all around by one-point irradiation with infrared laser light can be found by appropriately adjusting the outer diameter, thickness, and resin material of the thermoplastic resin tubes 1 and 2.

赤外線レーザー光としては、半導体レーザー（発信周波数１μｍ、波長２．８、μｍ）、ファイバーレーザー（発信周波数１．９２μｍ）、ＹＡＧレーザー（発信周波数２．８μｍ）、ＣＯレーザー（発信周波数５．５μｍ）、及びＣＯ２レーザー（発信周波数１０．６μｍ）等を用いることができ、被溶着樹脂材料により適宜選択できる。 As infrared laser light, a semiconductor laser (transmitting frequency 1 μm, wavelength 2.8, μm), fiber laser (transmitting frequency 1.92 μm), YAG laser (transmitting frequency 2.8 μm), CO laser (transmitting frequency 5.5 μm) , CO 2 laser (transmitting frequency 10.6 μm) or the like can be used, and can be appropriately selected depending on the resin material to be welded.

チューブ１，２の樹脂材料：ＰＡ１２（ナイロン）溶融温度 178℃
外側チューブ１：外径０．８８ｍｍ、厚さ０．０４ｍｍ
内側チューブ２：外径０．７ｍｍ、厚さ０．０４ｍｍ
金属棒５：材質ＳＵＳ、外径０．６７ｍｍ
（チューブ１，２及び金属棒５がそれぞれ密着するよう金属棒の径を選択する。溶着後、金属棒は力学的に容易に抜き取ることができる。）
ファイバーレーザー：波長１．９μｍ、強度２０Ｗ、照射時間２．５秒、スポット径 ４．４ｍｍ
結果：チューブ１，２の接触部全体がチューブの軸方向１．３ｍｍの範囲で溶融一体化した。 Resin material for tubes 1 and 2: PA12 (nylon) melting temperature 178 ° C
Outer tube 1: outer diameter 0.88mm, thickness 0.04mm
Inner tube 2: Outer diameter 0.7mm, thickness 0.04mm
Metal rod 5: material SUS, outer diameter 0.67 mm
(The diameter of the metal bar is selected so that the tubes 1 and 2 and the metal bar 5 are in close contact with each other. After the welding, the metal bar can be mechanically easily removed.)
Fiber laser: wavelength 1.9 μm, intensity 20 W, irradiation time 2.5 seconds, spot diameter 4.4 mm
Result: The entire contact portions of the tubes 1 and 2 were melted and integrated within a range of 1.3 mm in the axial direction of the tubes.

チューブ１，２の樹脂材料：ＰＦＡ(フッソ樹脂、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体) 、融点３１０℃
外側チューブ１：外径：０．７ｍｍ、厚さ０．０８ｍｍ
内側チューブ２：外径：０．５ｍｍ、厚さ０．０８ｍｍ
金属棒５：材質ＳＵＳ、外径０．３ｍｍ
（チューブ１，２及び金属棒５がそれぞれ密着するよう金属棒の径を選択する。溶着後、金属棒は力学的に容易に抜き取ることができる。）
ファイバーレーザー：波長１．９μｍ、強度３７．５Ｗ、照射時間２．５秒、スポット径 ４．４ｍｍ
結果：チューブ１，２の接触部全体がチューブの軸方向１．１ｍｍの範囲で溶融一体化した。 Resin material of tubes 1 and 2: PFA (fluoro resin, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), melting point 310 ° C.
Outer tube 1: outer diameter: 0.7 mm, thickness 0.08 mm
Inner tube 2: outer diameter: 0.5 mm, thickness 0.08 mm
Metal bar 5: material SUS, outer diameter 0.3 mm
(The diameter of the metal bar is selected so that the tubes 1 and 2 and the metal bar 5 are in close contact with each other. After the welding, the metal bar can be mechanically easily removed.)
Fiber laser: wavelength 1.9 μm, intensity 37.5 W, irradiation time 2.5 seconds, spot diameter 4.4 mm
Result: The entire contact portions of the tubes 1 and 2 were melted and integrated within a range of 1.1 mm in the axial direction of the tubes.

１ 外側チューブ
２ 内側チューブ
３ チューブの嵌合体
４ 赤外線レーザー光
５ 金属棒
６ 支持部材
７ 固体ヒートシンク
８ 位置調整機構
９ マスク
９ａ スリット
１０ 発熱部 DESCRIPTION OF SYMBOLS 1 Outer tube 2 Inner tube 3 Tube fitting 4 Infrared laser beam 5 Metal rod 6 Support member 7 Solid heat sink 8 Position adjusting mechanism 9 Mask 9a Slit 10 Heating part

Claims (8)

２つの異径の熱可塑性樹脂チューブである外側チューブと内側チューブとを密着するように嵌め合わせた嵌合体を赤外線レーザー光を用いて加熱溶着する装置であって、
前記嵌合体を支持する支持部材と、
前記外側チューブの外周側に接触するように配置される赤外線透過性の固体ヒートシンクと、
前記内側チューブの内周に接するように内側チューブ内に挿入される金属棒又は金属チューブと、
前記固体ヒートシンク側に配置され、当該固体ヒートシンクを通して前記嵌合体に赤外線レーザー光を照射するレーザー光源とを具備することを特徴とする熱可塑性樹脂チューブの溶着装置。 An apparatus for heat-welding a fitting body in which an outer tube and an inner tube, which are two different diameter thermoplastic resin tubes, are in close contact with each other using an infrared laser beam,
A support member for supporting the fitting body;
An infrared transparent solid heat sink disposed so as to contact the outer peripheral side of the outer tube;
A metal rod or metal tube inserted into the inner tube so as to contact the inner circumference of the inner tube;
A thermoplastic resin tube welding apparatus comprising: a laser light source disposed on the solid heat sink side and irradiating the fitting body with infrared laser light through the solid heat sink. 前記固体ヒートシンクとレーザー光源との間に、前記嵌合体に照射される赤外線レーザー光の断面積を規定するマスクが介設されることを特徴とする請求項１に記載の熱可塑性樹脂チューブの溶着装置。   The welding of the thermoplastic resin tube according to claim 1, wherein a mask defining a cross-sectional area of infrared laser light irradiated to the fitting body is interposed between the solid heat sink and the laser light source. apparatus. 前記嵌合体に照射される赤外線レーザー光の直径が、前記外側チューブの直径以上に設定されることを特徴とする請求項１に記載の熱可塑性樹脂チューブの溶着装置。   2. The thermoplastic resin tube welding apparatus according to claim 1, wherein a diameter of the infrared laser light irradiated to the fitting body is set to be equal to or larger than a diameter of the outer tube. 前記外側チューブの外径が３ｍｍ以下であることを特徴とする請求項１ないし３のいずれかに記載の熱可塑性樹脂チューブの溶着装置。   4. The thermoplastic resin tube welding apparatus according to claim 1, wherein an outer diameter of the outer tube is 3 mm or less. ２つの異径の熱可塑性樹脂チューブである外側チューブと内側チューブとを密着するように嵌め合わせて嵌合体を構成する工程と、
前記内側チューブの内側にそれの内周に接するように金属棒又は金属チューブを挿入する工程と、
前記嵌合体を支持部材上に支持する工程と、
前記外側チューブの外周側に接触するように赤外線透過性の固体ヒートシンクを配置する工程と、
前記固体ヒートシンク側のレーザー光源から当該固体ヒートシンクを通して前記嵌合体に赤外線レーザー光を照射する工程とを含むことを特徴とする熱可塑性樹脂チューブの溶着方法。 A step of forming a fitting body by fitting the outer tube and the inner tube, which are two different diameter thermoplastic resin tubes, in close contact with each other;
Inserting a metal rod or metal tube inside the inner tube so as to contact the inner circumference thereof;
Supporting the fitting body on a support member;
Placing an infrared transparent solid heat sink so as to contact the outer peripheral side of the outer tube;
Irradiating the fitting with infrared laser light from the laser light source on the solid heat sink side through the solid heat sink, and a method for welding a thermoplastic resin tube. 前記固体ヒートシンクとレーザー光源との間に、前記嵌合体に照射される赤外線レーザー光の断面積を規定するマスクを介設する工程を含むことを特徴とする請求項５に記載の熱可塑性樹脂チューブの溶着方法。   6. The thermoplastic resin tube according to claim 5, further comprising a step of interposing a mask defining a cross-sectional area of infrared laser light applied to the fitting body between the solid heat sink and the laser light source. Welding method. 前記嵌合体に照射される赤外線レーザー光の直径が、前記外側チューブの直径以上に設定されることを特徴とする請求項５に記載の熱可塑性樹脂チューブの溶着方法。   The method for welding thermoplastic resin tubes according to claim 5, wherein the diameter of the infrared laser light irradiated to the fitting body is set to be equal to or larger than the diameter of the outer tube. 前記外側チューブの外径が３ｍｍ以下であることを特徴とする請求項５ないし７のいずれかに記載の熱可塑性樹脂チューブの溶着方法。 The method for welding thermoplastic resin tubes according to any one of claims 5 to 7 , wherein an outer diameter of the outer tube is 3 mm or less.
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