JP2009101560A - Method of welding thermoplastic resin member - Google Patents

Method of welding thermoplastic resin member Download PDF

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Publication number
JP2009101560A
JP2009101560A JP2007274636A JP2007274636A JP2009101560A JP 2009101560 A JP2009101560 A JP 2009101560A JP 2007274636 A JP2007274636 A JP 2007274636A JP 2007274636 A JP2007274636 A JP 2007274636A JP 2009101560 A JP2009101560 A JP 2009101560A
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Prior art keywords
thermoplastic resin
infrared
resin member
welding
welding method
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Japanese (ja)
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Yasuo Kurosaki
晏夫 黒崎
Kimitoshi Sato
公俊 佐藤
Naoki Shimizu
直紀 清水
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Campus Create Co Ltd
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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
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • 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
    • B29C65/1619—Mid infrared radiation [MIR], e.g. by CO or CO2 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
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/347—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients
    • B29C66/3474—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients perpendicular to the plane of the joint
    • 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • 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
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81457—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a block or layer of deformable material, e.g. sponge, foam, rubber
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of IR welding method showning good welding results even in cases involving thick polyolefin resins (PE, PP) and polyfluorohydrocarbon resins. <P>SOLUTION: The method comprises polymerizing two or more thermoplastic resin members 3 onto a support 1, polymerizing an IR transmissive solid 5 to form a polymerization aggregate and irradiating the polymerization aggregate with a CO-source IR beam 11 from the side of the IR transmissive solid 5. Because a boundary temperature of the thermoplastic resin member in contact with the IR transmissive solid decreases relatively, an area of a higher temperature can be generated within the aggregate by utilizing the penetrated IR energy. A deterioration in surface property due to thermal damage in the IR-beam-irradiated surface can be thereby controlled, enabling formation of a heated/cooled welded layer in a short time. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は熱可塑性樹脂部材の溶着方法に関するものであり、さらに詳しくは赤外線ビームの照射による熱可塑性樹脂部材の溶着方法の改良に関するものである。   The present invention relates to a method for welding a thermoplastic resin member, and more particularly to improvement of a method for welding a thermoplastic resin member by irradiation with an infrared beam.

熱可塑性樹脂部材の溶着方法としては、従来から超音波溶着法、高周波溶着法などが公知であり実際にも使用されている。   As a method for welding a thermoplastic resin member, an ultrasonic welding method, a high frequency welding method, and the like have been known and used in practice.

超音波溶着法においては、超音波発振子より発生した超音波エネルギーが被溶着面で機械振動による摩擦熱に変換されることにより、被溶着面近傍のみが選択的に発熱して溶着する。しかし、被溶着材料が軟質樹脂の場合、超音波エネルギーが被溶着面に伝播される前に大幅に減衰するので、溶着が困難となる場合が多いという欠点がある。   In the ultrasonic welding method, ultrasonic energy generated from an ultrasonic oscillator is converted into frictional heat due to mechanical vibration on the surface to be welded, so that only the vicinity of the surface to be welded is selectively heated and welded. However, when the material to be welded is a soft resin, the ultrasonic energy is greatly attenuated before being propagated to the surface to be welded, so that there is a drawback that welding is often difficult.

高周波溶着法では、金属製高周波ダイと支持台によって挟み込まれた樹脂フィルムが、高周波を印加する交番電界中で、誘電損失により瞬時に発熱し溶着する。この場合、高周波発振ダイは高い熱伝導性をもつ金属であり、溶融した熱可塑性樹脂フィルム表層の熱が効率よく除熱されて樹脂表層は低温に維持されて、溶着部表面性状の変化の少ない溶着が可能である。しかしこの方法は誘電損失の少ないポリエチレン、ポリプロピレン、ポリスチレンポリエステルやフッ素樹脂などの溶着には適用困難となる場合が多いという欠点がある。   In the high-frequency welding method, a resin film sandwiched between a metal high-frequency die and a support base instantaneously generates heat and welds due to dielectric loss in an alternating electric field to which a high frequency is applied. In this case, the high-frequency oscillation die is a metal having high thermal conductivity, the heat of the melted thermoplastic resin film surface is efficiently removed, the resin surface layer is kept at a low temperature, and there is little change in the surface properties of the welded portion. Welding is possible. However, this method has a drawback that it is often difficult to apply to welding of polyethylene, polypropylene, polystyrene polyester, fluororesin and the like with a small dielectric loss.

そこでこれらに代わる溶着方法として赤外線透過溶着法が提案されている。この方法にあっては光源として赤外線を用い、支持体に対して２個以上の熱可塑性樹脂部材を重合し、さらに赤外線透過性固体を重合して重合群を形成し、この重合群に対して赤外線透過性固体側から赤外線ビームを照射するものである。   Therefore, an infrared transmission welding method has been proposed as an alternative welding method. In this method, infrared rays are used as a light source, two or more thermoplastic resin members are polymerized on a support, and an infrared transparent solid is polymerized to form a polymer group. An infrared beam is irradiated from the infrared transparent solid side.

しかし従来の赤外線透過溶着法においては、赤外線光源として１０μｍ帯のＣＯ2レーザーを用いていたが故に、厚いポリオレフィン樹脂（ＰＥ、ＰＰ）やポリフッ化炭化水素樹脂（ＰＦＡ、ＰＴＦＥなど）の場合には所望の良好な溶着結果が得られないという問題があった。 However, in the conventional infrared transmission welding method, since a CO 2 laser of 10 μm band is used as an infrared light source, in the case of a thick polyolefin resin (PE, PP) or a polyfluorinated hydrocarbon resin (PFA, PTFE, etc.) There was a problem that a desired good welding result could not be obtained.

この発明の目的は厚いポリオレフィン樹脂（ＰＥ、ＰＰ）やポリフッ化炭化水素樹脂の場合でも良好な溶着結果を齎す赤外線溶着法を提供することにある。 It is an object of the present invention to provide an infrared welding method that gives good welding results even in the case of thick polyolefin resins (PE, PP) and polyfluorohydrocarbon resins.

このためこの発明においては、支持体に対して２個以上の熱可塑性樹脂部材を重合し、さらに赤外線透過性固体を重合して重合群を形成し、この重合群に対して赤外線透過性固体側からＣＯを光源とする赤外線ビームを照射することを要旨とする。 For this reason, in the present invention, two or more thermoplastic resin members are polymerized on the support, and further, an infrared transmitting solid is polymerized to form a polymer group. The gist of the present invention is to irradiate an infrared beam using CO as a light source.

赤外線透過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ビーム照射側表層での熱損傷による表面性状の悪化が抑制され、短時間のうちに加熱・冷却された溶着層を得ることができる。 The boundary temperature of the thermoplastic resin member in contact with the infrared transmitting solid becomes relatively low, and a region where the temperature becomes higher in the inside due to the penetrated infrared energy can be developed. As a result, deterioration of the surface properties due to thermal damage on the surface layer of the thermoplastic resin member on the infrared beam irradiation side is suppressed, and a heated and cooled weld layer can be obtained in a short time.

図1に示すのはこの発明の溶着方法を実施するシステムの基本的構成を示すものである。支持体１に対向接触して２個の熱可塑性樹脂部材３が重合されており、さらにこれら重合された熱可塑性樹脂部材３に対し支持体１とは反対側にヒートシンク作用を有する赤外線透過性固体５を対向接触重合して重合体群が形成されている。この重合体群に矢印7で示すように圧縮力を加えて重合体群を構成する要素１，３，５を密着させる。ついでこの重合群に対して赤外線透過性固体５側からＣＯを光源９とする赤外線ビーム１１が照射される。   FIG. 1 shows a basic configuration of a system for carrying out the welding method of the present invention. The two thermoplastic resin members 3 are polymerized in contact with the support 1, and the infrared transparent solid having a heat sink function on the opposite side of the support 1 to the polymerized thermoplastic resin members 3. The polymer group is formed by subjecting 5 to opposite contact polymerization. A compressive force is applied to the polymer group as indicated by an arrow 7 to closely contact the elements 1, 3, and 5 constituting the polymer group. Next, an infrared beam 11 having CO as the light source 9 is irradiated from the infrared transmissive solid 5 side to the polymerization group.

この発明において用いる支持体１とは、赤外線ビーム１１の照射中に赤外線透過固体５と熱可塑性樹脂部材３および被溶着面同士が安定して接触状態を保つためのものである。その機能を持つ限りにおいては支持体1の材質や形状はどのようなものであってもよい。例えば圧縮力によっても塑性変形が生じ難く、適度な剛性を有したスチール、アルミニウム合金、銅合金などの金属性ブロックや板が用いられる。   The support 1 used in the present invention is for maintaining a stable contact state between the infrared transmitting solid 5, the thermoplastic resin member 3, and the welding surfaces during irradiation with the infrared beam 11. As long as it has the function, the support 1 may be of any material and shape. For example, a plastic block that hardly undergoes plastic deformation even by a compressive force and has an appropriate rigidity, such as a steel block, an aluminum alloy, or a copper alloy, is used.

さらに支持体１はその赤外線ビーム照射側表層がゴム緩衝層であってもよい。厚さが薄いまたは熱収縮性が高い熱可塑性樹脂部材同士を溶着するに当たって、熱可塑性樹脂部材自身の表面起伏などにより赤外線透過固体５と、熱可塑性樹脂部材３、および被溶着面同士の物理的接触状態（接触圧力および接触面積)が不足し、溶着後に溶着部でボイドや破れ、顕著な収縮などの欠陥が生じ易い場合がある。このような場合に、支持体１の赤外線ビーム照射側表層がゴム緩衝層であることによって、赤外線透過固体５と熱可塑性樹脂部材３、および被溶着面同士の物理的接触状態を改善し、溶着後のボイドや破れ、顕著な収縮などの欠陥の発生を抑えることができる。   Further, the support 1 may have a rubber buffer layer on the infrared beam irradiation side surface layer. When welding thermoplastic resin members having a small thickness or high heat shrinkability, the physical properties of the infrared transmitting solid 5, the thermoplastic resin member 3, and the surfaces to be welded due to surface undulations of the thermoplastic resin member itself, etc. In some cases, the contact state (contact pressure and contact area) is insufficient, and defects such as voids, tears, and significant shrinkage tend to occur after welding. In such a case, the surface layer on the infrared beam irradiation side of the support 1 is a rubber buffer layer, thereby improving the physical contact state between the infrared transmitting solid 5, the thermoplastic resin member 3, and the surfaces to be welded. It is possible to suppress the occurrence of defects such as subsequent voids, tears, and significant shrinkage.

赤外線透過固体５としてはセレン亜鉛（ＺｎＳｅ）、硫化亜鉛（Ｚｎｓ）、シリコン（Ｓｉ）、ゲルマニウム(Ｇｅ)、サファイア(Ａｌ2Ｏ3)または砒素化ガリウム（ＧａＡｓ）などの、熱伝導度１５ｗ/ｍ・Ｋ以上を有する赤外結晶材料が挙げられる。 Examples of the infrared transmitting solid 5 include selenium zinc (ZnSe), zinc sulfide (Zns), silicon (Si), germanium (Ge), sapphire (Al 2 O 3 ), gallium arsenide (GaAs), and the like. Infrared crystal material having m · K or more.

この発明の赤外線溶着方法により溶着できる熱可塑性樹脂部材としては、従来の溶着方法では難溶着性を呈する熱可塑性樹脂部材、つまり高周波帯域での誘電損失が低くかつ軟質であるが故に高周波溶着および超音波溶着のいずれを適用しても溶着が困難である熱可塑性樹脂部材、および高周波帯域で誘電損失が低くかつ融点が高い熱可塑性樹脂部材が挙げられる。かかる熱可塑性樹脂部材の具体例としては、前者としてはオレフィン系熱可塑性エラストマーが、後者としてはフッ素系樹脂や液晶ポリマーがある。   The thermoplastic resin member that can be welded by the infrared welding method of the present invention is a thermoplastic resin member that is difficult to weld by the conventional welding method, that is, because the dielectric loss in the high frequency band is low and soft, so Examples thereof include a thermoplastic resin member that is difficult to weld by any of sonic welding, and a thermoplastic resin member that has a low dielectric loss and a high melting point in a high frequency band. Specific examples of such thermoplastic resin members include olefin-based thermoplastic elastomers as the former and fluorine-based resins and liquid crystal polymers as the latter.

図２に示すのは赤外線光源としてＣＯ2を用いた場合（鎖線１９）と赤外線光源としてＣＯを用いた場合(点線１７)の熱可塑性樹脂部材内部の温度分布の状態である。図から明らかなように、赤外線光源としてＣＯ2を用いた場合には、温度分布が赤外線透過性固体５と熱可塑性樹脂部材３との境界で最高となる。この結果熱損傷による表面性状の悪化が生じ易い。 FIG. 2 shows the temperature distribution inside the thermoplastic resin member when CO 2 is used as the infrared light source (dashed line 19) and when CO is used as the infrared light source (dotted line 17). As is apparent from the figure, when CO 2 is used as the infrared light source, the temperature distribution is highest at the boundary between the infrared transmitting solid 5 and the thermoplastic resin member 3. As a result, surface properties are likely to deteriorate due to thermal damage.

一方赤外線光源としてＣＯを用いた場合には、温度分布が赤外線透過性固体５と熱可塑性樹脂部材３との境界で低くなり両熱可塑性樹脂部材３の境界１３（溶着面）で最高となる。つまり浸透した赤外線エネルギーにより内部に高温となった領域を発現できる。   On the other hand, when CO is used as the infrared light source, the temperature distribution becomes lower at the boundary between the infrared transmissive solid 5 and the thermoplastic resin member 3 and becomes highest at the boundary 13 (welded surface) between the two thermoplastic resin members 3. In other words, a region having a high temperature inside can be expressed by the penetrated infrared energy.

その結果熱可塑性樹脂部材３の赤外線照射側表層での顕著な収縮、破れ、焼爛および熱分解などの熱損傷による表面性状の悪化を極力抑制しながら、短時間の内に加熱・冷却された溶着層を得ることができるのである。なお１５で示すのは溶着面の溶融温度である。 As a result, the thermoplastic resin member 3 was heated and cooled within a short period of time while suppressing deterioration of surface properties due to thermal damage such as remarkable shrinkage, tearing, cauterization and thermal decomposition on the infrared irradiation side surface layer as much as possible. A weld layer can be obtained. Reference numeral 15 denotes the melting temperature of the weld surface.

ところで赤外線照射側の熱可塑性樹脂部材３が図３に示すように厚い場合には、熱可塑性樹脂部材３の内部温度分布は赤外線透過性固体５と熱可塑性樹脂部材３との境界近くに留まる。したがって溶着面１３を必要な温度にまで高めようとすると、赤外線照射側の熱可塑性樹脂部材３の表層温度が溶着面の温度を上回るようになり、熱損傷による表面性状の悪化が生じてしまう。 When the thermoplastic resin member 3 on the infrared irradiation side is thick as shown in FIG. 3, the internal temperature distribution of the thermoplastic resin member 3 remains near the boundary between the infrared transmissive solid 5 and the thermoplastic resin member 3. Therefore, if it is going to raise the welding surface 13 to required temperature, the surface layer temperature of the thermoplastic resin member 3 by the side of infrared irradiation will exceed the temperature of a welding surface, and the surface property will deteriorate by heat damage.

そこで照射する赤外線ビームの波長が熱可塑性樹脂部材３において溶着に必要な吸収性を保ちつつかつ適度な透過性を有するように、ＣＯレーザーの波長が5μｍ帯になるように調節する。この結果熱可塑性樹脂部材中における温度分布は図中実線２１で示すようになり、表層よりさらに内部（溶着面１３付近）で高温となる領域を実現でき、肉厚の熱可塑性樹脂部材表層の溶着が可能となる。 Therefore, the wavelength of the CO laser is adjusted so as to be in the 5 μm band so that the wavelength of the infrared beam to be irradiated has appropriate transmittance while maintaining the absorbency necessary for welding in the thermoplastic resin member 3. As a result, the temperature distribution in the thermoplastic resin member becomes as shown by a solid line 21 in the figure, and it is possible to realize a region where the temperature is higher in the interior (near the welding surface 13) than the surface layer. Is possible.

図４に示すのは四フッ化エチレン・パーフロロアルキルビニルエーテル共重合体樹脂（ＰＦＡ）の平行光透過スペクトルである。図示のように透過性はＣＯ2レーザーの波長である１０．６μｍにおいては非常に低い。したがって肉厚の熱可塑性樹脂部材を重合させた場合には熱可塑性樹脂部材深部への赤外線エネルギーの浸透量が少なく溶着面の温度が上がり難い。しかし5μｍ帯における浸透性は１０．6μｍにおける場合に比べて顕著であり、かつ適度な吸収性も示している。ＣＯレーザーはこの５μｍ帯に発信波長を有するので、熱可塑性樹脂部材深部への赤外線透過量を確保する性質を発現できるのである。 FIG. 4 shows a parallel light transmission spectrum of a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer resin (PFA). As shown in the figure, the transmittance is very low at 10.6 μm which is the wavelength of the CO 2 laser. Therefore, when a thick thermoplastic resin member is polymerized, the penetration amount of infrared energy into the deep part of the thermoplastic resin member is small, and the temperature of the welded surface is difficult to rise. However, the permeability in the 5 μm band is remarkable as compared with the case of 10.6 μm and also shows an appropriate absorbency. Since the CO laser has a transmission wavelength in the 5 μm band, it can exhibit the property of ensuring the amount of infrared rays transmitted to the deep part of the thermoplastic resin member.

この発明は熱可塑性樹脂部材の溶着において広く利用できるものである。 The present invention can be widely used for welding thermoplastic resin members.

この発明の溶着方法を実施するシステムの基本的構成を示す模型側面図である。It is a model side view which shows the basic composition of the system which enforces the welding method of this invention. この発明による溶着時の熱可塑性樹脂部材内部の温度分布を示す模型側面図である。It is a model side view which shows the temperature distribution inside the thermoplastic resin member at the time of welding by this invention. この発明において波長調節により肉厚熱可塑性樹脂部材を溶着した場合の温度分布を示す模型側面図である。It is a model side view which shows temperature distribution at the time of welding a thick thermoplastic resin member by wavelength adjustment in this invention. ＰＦＡの平行光透過スペクトルである。It is a parallel light transmission spectrum of PFA.

符号の説明Explanation of symbols

１ 支持体
３ 熱可塑性樹脂部材
５ 赤外線透過性固体
９ 赤外線光源
１１ 赤外線ビーム DESCRIPTION OF SYMBOLS 1 Support body 3 Thermoplastic resin member 5 Infrared transparent solid 9 Infrared light source 11 Infrared beam

Claims (4)

支持体に対して２個以上の熱可塑性樹脂部材を重合し、さらに赤外線透過性固体を重合して重合群を形成し、この重合群に対して赤外線透過性固体側からＣＯレーザーを光源とする赤外線ビームを照射することを特徴とする熱可塑性樹脂部材の溶着方法。   Two or more thermoplastic resin members are polymerized on the support, and further, an infrared transparent solid is polymerized to form a polymerization group, and a CO laser is used as a light source from the infrared transparent solid side for this polymerization group. A method for welding a thermoplastic resin member, characterized by irradiating an infrared beam. 前記ＣＯレーザーの波長が5μｍ帯であることを特徴とする請求項１に記載の溶着方法。   The welding method according to claim 1, wherein the wavelength of the CO laser is in a 5 μm band. 前記支持体の赤外線ビーム照射側表層がゴム緩衝層であることを特徴とする請求項１に記載の溶着方法。   The welding method according to claim 1, wherein the infrared ray irradiation side surface layer of the support is a rubber buffer layer. 赤外線透過性固体としてセレン化亜鉛、硫化亜鉛、シリコン、ゲルマニウム、サファイアまたは砒素化ガリウムを用いることを特徴とする請求項１に記載の溶着方法。   The welding method according to claim 1, wherein zinc selenide, zinc sulfide, silicon, germanium, sapphire, or gallium arsenide is used as the infrared transparent solid.
JP2007274636A 2007-10-23 2007-10-23 Method of welding thermoplastic resin member Pending JP2009101560A (en)

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WO2003039843A1 (en) * 2001-11-07 2003-05-15 Mitsui Chemicals Inc Process for welding of thermoplastic resins

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JP2003504233A (en) * 1999-07-12 2003-02-04 コルゲート・パーモリブ・カンパニー Laser bonding to toothbrush head handle
WO2003039843A1 (en) * 2001-11-07 2003-05-15 Mitsui Chemicals Inc Process for welding of thermoplastic resins

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016065560A (en) * 2014-09-24 2016-04-28 アドバンス電気工業株式会社 Diaphragm valve, and annular valve seat formation method and valve body formation method thereof
WO2020246359A1 (en) * 2019-06-05 2020-12-10 Ckd株式会社 Manufacturing method for fluid control apparatus
JP2020200840A (en) * 2019-06-05 2020-12-17 Ckd株式会社 Manufacturing method of fluid control apparatus
KR20210153701A (en) * 2019-06-05 2021-12-17 씨케이디 가부시키 가이샤 Methods for manufacturing fluid control devices
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JP7411991B2 (en) 2020-01-07 2024-01-12 株式会社キャンパスクリエイト Method for welding thermoplastic resin molded bodies

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