JP2006068910A - Welded structure of fluoroplastic resin materials - Google Patents

Welded structure of fluoroplastic resin materials Download PDF

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Publication number
JP2006068910A
JP2006068910A JP2004251498A JP2004251498A JP2006068910A JP 2006068910 A JP2006068910 A JP 2006068910A JP 2004251498 A JP2004251498 A JP 2004251498A JP 2004251498 A JP2004251498 A JP 2004251498A JP 2006068910 A JP2006068910 A JP 2006068910A
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fluororesin
fluororesin material
welded structure
core material
recess
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Yutaka Shimoda
裕 下田
Takeo Tomizawa
建男 富沢
Eishin Yamagishi
英信 山岸
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Nichias Corp
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Nichias 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5057—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like positioned between the surfaces to be joined
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
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    • 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
    • B29C65/1429—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 characterised by the way of heating the interface
    • B29C65/1464—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 characterised by the way of heating the interface making use of several radiators
    • B29C65/1467—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 characterised by the way of heating the interface making use of several radiators at the same time, i.e. simultaneous welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • 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
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/562—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits using extra joining elements, i.e. which are not integral with the parts to be joined
    • B29C65/564—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits using extra joining elements, i.e. which are not integral with the parts to be joined hidden in the joint, e.g. dowels or Z-pins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/024—Thermal pre-treatments
    • B29C66/0242—Heating, or preheating, e.g. drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • 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
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove joints
    • B29C66/1244—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue
    • B29C66/12443—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue having the tongue substantially in the middle
    • 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
    • B29C66/3472—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 in the plane of the joint, e.g. along the joint line in the plane of the joint or perpendicular to the joint line in 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
    • B29C66/01—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
    • B29C66/50—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
    • B29C66/526—Joining bars
    • B29C66/5261—Joining bars for forming coaxial connections, i.e. the bars 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
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    • 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
    • B29C66/526—Joining bars
    • B29C66/5268—Joining bars characterised by their solid cross sections being non-circular, e.g. being elliptical, square or rectangular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/63—Internally supporting the article during joining
    • B29C66/636—Internally supporting the article during joining using a support which remains in the joined object
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—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
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • 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
    • B29C66/712—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 the composition of one of the parts to be joined being different from the composition of the other part
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
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    • B29C65/565—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits involving interference fits, e.g. force-fits or press-fits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2309/00—Use of inorganic materials not provided for in groups B29K2303/00 - B29K2307/00, as reinforcement
    • B29K2309/08—Glass

Abstract

<P>PROBLEM TO BE SOLVED: To provide a welded structure of fluoroplastic materials capable of ensuring sufficiently large bending strength. <P>SOLUTION: Hardly weldable fluoroplastic materials 10 comprising PTFE or the like are arranged so that the bonding surfaces 12 of them are opposed to each other and a thermally weldable fluoroplastic 14 like PFA or modified PTFE is interposed between the bonding surfaces 12 to bond the fluoroplastic materials 10 under heating and pressure. Recessed places 16 opposed to each other are formed to the bonding surfaces 12 and an inner core material 18 is inserted in the recessed places 16. One hollow part is formed by the recessed places 16 opposed to each other when the bonding surfaces 12 of the fluoroplastic materials 10 are arranged in opposed relationship and, since the inner core material 18 is inserted in the hollow part so as to go across both of two bonded fluoroplastic materials 10, the bending strength of the bonded part can be enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、難溶着性のフッ素樹脂材料を接合するための溶着構造体に関する。   The present invention relates to a welded structure for joining hardly welded fluororesin materials.

従来より、ポリテトラフルオロエチレン（ＰＴＦＥ）等のフッ素樹脂は、その卓越した熱的、化学的安定性及び電気絶縁性等のために、各種用途に多用されている。このＰＴＦＥは、原料粉をそのまま、または所定の充填材とともに金型に充填して圧縮し、３５０〜４００℃の温度で所定時間加熱して成形する。このような成形後のＰＴＦＥは、融点以上に加熱しても溶着させることが困難な難溶着性のフッ素樹脂材料である。このため、大型の部材を製作するにはＰＴＦＥ材料同士を所定の熱融着性フッ素樹脂材料等を介して溶着し、接合する必要がある。   Conventionally, fluororesins such as polytetrafluoroethylene (PTFE) have been widely used for various applications because of their excellent thermal and chemical stability and electrical insulation. This PTFE is molded by filling raw material powder as it is or filling a mold together with a predetermined filler and heating it at a temperature of 350 to 400 ° C. for a predetermined time. Such molded PTFE is a hardly weldable fluororesin material that is difficult to weld even when heated to a melting point or higher. For this reason, in order to manufacture a large-sized member, it is necessary to weld PTFE materials to each other via a predetermined heat-fusible fluororesin material and join them.

例えば、下記特許文献１には、ポリテトラフルオロエチレンよりなる成形体を加熱圧着して接合する方法が開示されている。
特公昭６０−５６６１１号公報 For example, Patent Document 1 below discloses a method of joining a molded body made of polytetrafluoroethylene by thermocompression bonding.
Japanese Patent Publication No. 60-56611

しかし、上記従来の技術においては、接合部の曲げ強度を十分に確保できないという問題があった。   However, the above conventional technique has a problem that the bending strength of the joint portion cannot be sufficiently secured.

本発明は、上記従来の課題に鑑みなされたものであり、その目的は、十分に大きな曲げ強度を確保できるフッ素樹脂材料の溶着構造体を提供することにある。   The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a welded structure of a fluororesin material that can ensure a sufficiently large bending strength.

上記目的を達成するために、本発明は、難溶着性のフッ素樹脂材料を、接合面を介して溶着したフッ素樹脂材料の溶着構造体であって、前記接合面には、互いに対向する凹所が形成され、前記凹所には、接合される前記フッ素樹脂材料の双方に架けて中芯材が嵌入されていることを特徴とする。上記中芯材は角柱形状または円柱形状であるのが好適である。   In order to achieve the above object, the present invention provides a welded structure of a fluororesin material in which a hardly weldable fluororesin material is welded via a joint surface, and the joint surface has recesses facing each other. In the recess, an intermediate core material is fitted over both of the fluororesin materials to be joined. It is preferable that the core material has a prismatic shape or a cylindrical shape.

ここで、上記中芯材は少なくとも１つの端面が前記フッ素樹脂材料の表面に露出していてもよい。   Here, at least one end face of the middle core material may be exposed on the surface of the fluororesin material.

また、上記中芯材はフッ素樹脂で形成されているのが好適である。   Moreover, it is preferable that the core material is made of a fluororesin.

また、本発明は、難溶着性のフッ素樹脂材料を、接合面を介して溶着したフッ素樹脂材料の溶着構造体であって、前記接合面の一方に凹所が形成され、前記接合面の他方に突起部が形成され、前記突起部が前記凹所に嵌入されていることを特徴とする。   The present invention is also a welded structure of a fluororesin material in which a hardly weldable fluororesin material is welded via a joint surface, wherein a recess is formed in one of the joint surfaces, and the other of the joint surfaces A protrusion is formed in the protrusion, and the protrusion is fitted into the recess.

また、上記フッ素樹脂材料の溶着構造体において、前記接合面の間には、熱融着性フッ素樹脂材料が介在されて接合されていることを特徴とする。上記熱融着性フッ素樹脂材料は、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樹脂（ＰＦＡ）または変性ＰＴＦＥであるのが好適である。   Further, in the welded structure of the fluororesin material, a heat-sealable fluororesin material is interposed between and joined to the joining surfaces. The heat-sealable fluororesin material is preferably tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer resin (PFA) or modified PTFE.

本発明によれば、フッ素樹脂材料の接合面に形成された凹所に中芯材が収容されているので、大きな曲げ強度を確保できる。   According to the present invention, since the core material is accommodated in the recess formed in the joint surface of the fluororesin material, a large bending strength can be ensured.

以下、本発明を実施するための最良の形態（以下、実施形態という）を、図面に従って説明する。   Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described with reference to the drawings.

図１には、本発明にかかるフッ素樹脂材料の溶着構造体の一実施形態の断面図が示される。図１において、ＰＴＦＥ等の難溶着性のフッ素樹脂材料１０は、互いにその接合面１２が対向するように配置され、接合面１２の間に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樹脂（ＰＦＡ）または変性ＰＴＦＥのような熱融着性フッ素樹脂１４を介在させ、所定の溶着装置により加熱圧着することにより接合される。上記変性ＰＴＦＥとしては、例えば三井デュポンフロロケミカル社製７０Ｊ、ダイキン工業社製Ｍ１１２等がある。また、フッ素樹脂材料１０としては、ガラスファイバーなどのフィラーを配合したＰＴＦＥ等も使用できる。   FIG. 1 shows a cross-sectional view of an embodiment of a fluororesin material welded structure according to the present invention. In FIG. 1, a hardly-welding fluororesin material 10 such as PTFE is disposed such that its joint surfaces 12 face each other, and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer resin (PFA) is interposed between the joint surfaces 12. Alternatively, bonding is performed by interposing a heat-sealable fluororesin 14 such as modified PTFE and thermocompression bonding with a predetermined welding apparatus. Examples of the modified PTFE include 70J manufactured by Mitsui DuPont Fluorochemical Co., M112 manufactured by Daikin Industries, Ltd. Moreover, as the fluororesin material 10, PTFE etc. which mix | blended fillers, such as glass fiber, can also be used.

本発明において特徴的な点は、フッ素樹脂材料１０の接合面１２に、互いに対向する凹所１６が形成され、この凹所１６に中芯材１８が嵌入されている点である。各凹所１６は、フッ素樹脂材料１０の接合面１２を対向させて配置したときに互いに対向する位置に形成されるので、これらの凹所１６により１つの中空部が形成される。中芯材１８は、２つの凹所１６によって形成される中空部の中に、接合される２つのフッ素樹脂材料１０の双方に架かるように嵌入されているので、接合部分の曲げ強度を向上させることができる。中芯材１８の形状は、特に限定されないが、例えば角柱形状、円柱形状等の凹所１６及び中芯材１８の製作が容易な形状とするのが好適である。   A characteristic point in the present invention is that a recess 16 is formed in the joint surface 12 of the fluororesin material 10 so as to face each other, and an inner core material 18 is fitted in the recess 16. Since each recess 16 is formed at a position facing each other when the bonding surfaces 12 of the fluororesin material 10 are arranged to face each other, one hollow portion is formed by these recesses 16. Since the middle core member 18 is fitted in the hollow portion formed by the two recesses 16 so as to span both of the two fluororesin materials 10 to be joined, the bending strength of the joined portion is improved. be able to. The shape of the middle core material 18 is not particularly limited, but it is preferable that the recess 16 and the middle core material 18 such as a prismatic shape, a cylindrical shape, and the like are easily formed.

図２には、本発明にかかるフッ素樹脂材料の溶着構造体の他の実施形態の斜視図が示される。図２では、破線により内部構造の一部も示されている。図２において、特徴的な点は、中芯材１８の少なくとも１つの端面２０がフッ素樹脂材料１０の表面に露出している点である。対向する２つの端面２０をフッ素樹脂材料１０の表面に露出させてもよい。これにより、２つの凹所１６によって形成される中空部に中芯材１８を嵌入する操作を容易に行うことができる。   FIG. 2 shows a perspective view of another embodiment of the welded structure of the fluororesin material according to the present invention. In FIG. 2, a part of the internal structure is also shown by a broken line. In FIG. 2, a characteristic point is that at least one end face 20 of the core material 18 is exposed on the surface of the fluororesin material 10. Two opposing end faces 20 may be exposed on the surface of the fluororesin material 10. Thereby, operation which inserts the core material 18 in the hollow part formed of the two recesses 16 can be performed easily.

図３には、本発明にかかるフッ素樹脂材料の溶着構造体のさらに他の実施形態の断面図が示される。図３において、特徴的な点は、凹所１６が一方のフッ素樹脂材料１０の接合面１２のみに形成され、他方のフッ素樹脂材料１０には、中芯材１８の代わりに突起部１９が形成されている点にある。この突起部１９は、上記一方のフッ素樹脂材料１０の接合面１２に形成された凹所１６に嵌入される。これにより、接合される２つのフッ素樹脂材料１０の両方の接合面１２に形成された凹所１６に中芯材１８を嵌入するのと同じ効果を得ることができる。   FIG. 3 shows a cross-sectional view of still another embodiment of the fluororesin material welded structure according to the present invention. In FIG. 3, a characteristic point is that the recess 16 is formed only on the joining surface 12 of one fluororesin material 10, and the protrusion 19 is formed on the other fluororesin material 10 instead of the core material 18. It is in the point. The protrusion 19 is fitted into a recess 16 formed in the joint surface 12 of the one fluororesin material 10. Thereby, the same effect as inserting the core material 18 in the recess 16 formed in the joint surfaces 12 of the two fluororesin materials 10 to be joined can be obtained.

図４には、本発明にかかるフッ素樹脂材料の溶着構造体を製作するための溶着装置の構成例の断面図が示される。図４において、２つのフッ素樹脂材料１０は、互いにその接合面１２が対向するように配置され、固定手段２２で支持、固定されている。また、接合面１２に形成され、互いに対向する２つの凹所１６によって構成される中空部には、上述した中芯材１８が嵌入されている。また、フッ素樹脂材料１０の接合面１２の周囲には、接合面１２及びその近傍を、フッ素樹脂材料１０の溶融温度以上の温度に加熱する加熱手段２４が配置されている。さらに、加熱手段２４の両端側には、余熱手段２６が配置されており、フッ素樹脂材料１０の加熱手段２４で加熱される領域である加熱部位の外側を、フッ素樹脂材料１０の溶融温度より低い温度で余熱するように構成されている。   FIG. 4 shows a cross-sectional view of a configuration example of a welding apparatus for manufacturing a fluororesin material welded structure according to the present invention. In FIG. 4, two fluororesin materials 10 are arranged such that their joint surfaces 12 face each other, and are supported and fixed by fixing means 22. Further, the above-described core material 18 is inserted into a hollow portion formed by the two recesses 16 formed on the joint surface 12 and facing each other. A heating unit 24 is disposed around the bonding surface 12 of the fluororesin material 10 to heat the bonding surface 12 and its vicinity to a temperature equal to or higher than the melting temperature of the fluororesin material 10. Furthermore, preheating means 26 are disposed on both ends of the heating means 24, and the outside of the heating portion, which is a region heated by the heating means 24 of the fluororesin material 10, is lower than the melting temperature of the fluororesin material 10. It is configured to preheat at temperature.

本発明者らは、上記加熱手段２４により加熱を行っている間、上述した加熱部位の外側を余熱手段２６によりフッ素樹脂材料１０の溶融温度より低い温度で予熱することにより、加熱圧着後のフッ素樹脂材料１０の収縮変形を抑制できることを見い出した。この余熱は、加熱手段２４による加熱と同じタイミングで開始及び終了してもよいし、加熱が終了した後所定時間経過するまで継続してもよい。   The present inventors preheat the outside of the above-mentioned heating part with the preheating means 26 at a temperature lower than the melting temperature of the fluororesin material 10 while heating by the heating means 24, so that fluorine after thermocompression bonding is obtained. It has been found that shrinkage deformation of the resin material 10 can be suppressed. This remaining heat may start and end at the same timing as the heating by the heating means 24, or may continue until a predetermined time elapses after the heating is completed.

なお、上記固定手段２２は、フッ素樹脂材料１０を支持、固定できるものであれば限定されないが、例えば油圧式のクランプ等を使用することができる。また、上記加熱手段２４及び余熱手段２６の、フッ素樹脂材料１０の長さ方向における長さは、フッ素樹脂材料１０の径に応じて適宜決定するが、例えば５０ｍｍ×５０ｍｍのフッ素樹脂の角材同士を接合する場合、加熱手段２４及び余熱手段２６の長さを１０〜１００ｍｍの範囲とするのが好適である。   The fixing means 22 is not limited as long as it can support and fix the fluororesin material 10, but for example, a hydraulic clamp or the like can be used. Further, the length of the heating means 24 and the preheating means 26 in the length direction of the fluororesin material 10 is appropriately determined according to the diameter of the fluororesin material 10, but, for example, squares of fluororesins of 50 mm × 50 mm In the case of joining, it is preferable that the length of the heating means 24 and the preheating means 26 is in the range of 10 to 100 mm.

図４に示された溶着装置により２つのフッ素樹脂材料１０の溶着を行うには、フッ素樹脂材料１０を固定手段２２で支持、固定し、接合面１２を対向させてその間にＰＦＡのような熱融着性フッ素樹脂１４を介在させ、余熱手段２６により余熱しつつ、加熱手段２４により所定温度まで加熱する。この場合、余熱温度は２００〜３００℃であり、加熱温度は３５０〜４００℃である。このように、加熱手段２４により接合面１２及びその近傍を、フッ素樹脂材料１０の溶融温度以上の温度で加熱することにより、接合面１２の近傍のフッ素樹脂及び接合面１２の間に介在されたＰＦＡが溶融される。この際、フッ素樹脂材料１０は熱膨張によりその長さ方向に伸びようとするが、固定手段２２によりフッ素樹脂材料１０の上記接合面１２から離隔した部分が支持、固定されているので、対向した接合面１２同士が互いに押圧し合い、その結果接合面１２に２００×１０４Ｎ／ｍ２程度の高い圧力が発生する。このように、接合面１２の近傍の難溶着性フッ素樹脂及びＰＦＡが溶融した状態で所定時間、例えば２．５時間程度圧力を作用させ、その後冷却することにより、ＰＦＡを介して難溶着性フッ素樹脂材料１０同士を接合面１２において接合することができる。 In order to perform welding of the two fluororesin materials 10 by the welding apparatus shown in FIG. 4, the fluororesin material 10 is supported and fixed by the fixing means 22, and the bonding surface 12 is opposed to each other while heat such as PFA is interposed therebetween. While the fusible fluororesin 14 is interposed and heated by the remaining heat means 26, it is heated to a predetermined temperature by the heating means 24. In this case, the preheating temperature is 200 to 300 ° C, and the heating temperature is 350 to 400 ° C. In this way, the joining surface 12 and the vicinity thereof are heated by the heating means 24 at a temperature equal to or higher than the melting temperature of the fluororesin material 10, thereby being interposed between the fluororesin near the joining surface 12 and the joining surface 12. PFA is melted. At this time, the fluororesin material 10 tends to extend in the length direction due to thermal expansion, but the portion separated from the joint surface 12 of the fluororesin material 10 is supported and fixed by the fixing means 22, so that they face each other. The joining surfaces 12 are pressed against each other, and as a result, a high pressure of about 200 × 10 4 N / m 2 is generated on the joining surface 12. As described above, the hardly weldable fluorine resin and the PFA in the vicinity of the bonding surface 12 are subjected to a pressure for a predetermined time, for example, about 2.5 hours in the melted state, and then cooled, thereby cooling the hardly weldable fluorine via the PFA. The resin materials 10 can be bonded together at the bonding surface 12.

なお、上述したように、加熱圧着する際に、フッ素樹脂材料１０の接合面１２に圧力を作用させるため、中芯材１８の長さは凹所１６によって構成される中空部の長さより若干短くしておくのが好適である。   As described above, since the pressure is applied to the joint surface 12 of the fluororesin material 10 during the thermocompression bonding, the length of the middle core material 18 is slightly shorter than the length of the hollow portion constituted by the recess 16. It is preferable to keep it.

以上のようにして製作したフッ素樹脂材料の溶着構造体の曲げ強度を測定した。測定には、幅７３．１ｍｍ×厚さ４２．１ｍｍのガラス繊維１５％含有ＰＴＦＥを接合面で接合し、長さ４３０ｍｍとした溶着構造体を使用した。この溶着構造体に使用した中芯材は、幅３７ｍｍ×厚さ１２ｍｍ×長さ１００ｍｍのガラス繊維１５％含有ＰＴＦＥを使用した。また、曲げ試験は、５００ｋｇｆ（４９００Ｎ）のロードセルを使用し、支持スパン４００ｍｍ、曲げ速度１０ｍｍ／分で行った。なお、比較例として、図５に示されるような深さ３５ｍｍの開先部（溶接用の溝）３０を形成し、この開先部３０に溶融したＰＦＡ３２を満たして接合する従来の溶接方法で溶接したフッ素樹脂材料の曲げ試験も上記同様に行った。これらの結果が表１に示される。   The bending strength of the fluororesin material welded structure manufactured as described above was measured. For the measurement, a welded structure having a length of 430 mm was obtained by bonding PTFE containing 15% of glass fiber having a width of 73.1 mm and a thickness of 42.1 mm at the bonding surface. The core material used for this welded structure was PTFE containing 15% glass fiber having a width of 37 mm, a thickness of 12 mm, and a length of 100 mm. The bending test was performed using a 500 kgf (4900 N) load cell at a support span of 400 mm and a bending speed of 10 mm / min. As a comparative example, a conventional welding method in which a groove portion (welding groove) 30 having a depth of 35 mm as shown in FIG. 5 is formed and the groove portion 30 is filled with molten PFA 32 and joined. The bending test of the welded fluororesin material was performed in the same manner as described above. These results are shown in Table 1.

Figure 2006068910
Figure 2006068910

表１に示されるように、本発明にかかる溶着構造体の曲げ強度（本発明品強度）は８．０ｍｍのたわみで２１５ｋｇｆ（２１０７Ｎ）であった。この時、接合部の破断はなかった。これに対して、比較例の曲げ強度（比較品強度）は、たわみ５．８〜７．８ｍｍのときに１３０〜１５０ｋｇｆ（１２７４〜１４７０Ｎ）であり、接合部が破断した。これにより、本発明の溶着構造体の曲げ強度が大きく向上しているのがわかる。   As shown in Table 1, the bending strength (the strength of the present invention) of the welded structure according to the present invention was 215 kgf (2107 N) with a deflection of 8.0 mm. At this time, the joint was not broken. On the other hand, the bending strength (comparative product strength) of the comparative example was 130 to 150 kgf (1274-1470 N) when the deflection was 5.8 to 7.8 mm, and the joint portion was broken. Thereby, it turns out that the bending strength of the welding structure of this invention is improving greatly.

本発明にかかるフッ素樹脂材料の溶着構造体の一実施形態の断面図である。It is sectional drawing of one Embodiment of the welding structure of the fluororesin material concerning this invention. 本発明にかかるフッ素樹脂材料の溶着構造体の他の実施形態の斜視図である。It is a perspective view of other embodiment of the welding structure of the fluororesin material concerning this invention. 本発明にかかるフッ素樹脂材料の溶着構造体のさらに他の実施形態の断面図である。It is sectional drawing of other embodiment of the welding structure of the fluororesin material concerning this invention. 本発明にかかるフッ素樹脂材料の溶着構造体を製作するための溶着装置の構成例の断面図である。It is sectional drawing of the structural example of the welding apparatus for manufacturing the welding structure of the fluororesin material concerning this invention. 従来におけるフッ素樹脂材料の溶接方法の説明図である。It is explanatory drawing of the welding method of the conventional fluororesin material.

符号の説明Explanation of symbols

１０ フッ素樹脂材料、１２ 接合面、１４ 熱融着性フッ素樹脂、１６ 凹所、
１８ 中芯材、１９ 突起部、２０ 端面、２２ 固定手段、２４ 加熱手段、
２６ 余熱手段、３０ 開先部、３２ ＰＦＡ。 10 fluororesin material, 12 joint surface, 14 heat-sealable fluororesin, 16 recess,
18 core material, 19 protrusion, 20 end face, 22 fixing means, 24 heating means,
26 Preheating means, 30 groove part, 32 PFA.

Claims (7)

難溶着性のフッ素樹脂材料を、接合面を介して溶着したフッ素樹脂材料の溶着構造体であって、
前記接合面には、互いに対向する凹所が形成され、
前記凹所には、接合される前記フッ素樹脂材料の双方に架けて中芯材が嵌入されていることを特徴とするフッ素樹脂材料の溶着構造体。 A fluororesin material welded structure in which a hardly weldable fluororesin material is welded via a joint surface,
The joint surface is formed with recesses facing each other,
In the recess, a fluororesin material welded structure is characterized in that an intermediate core material is fitted over both of the fluororesin materials to be joined. 請求項１記載のフッ素樹脂材料の溶着構造体において、前記中芯材は角柱形状または円柱形状であることを特徴とするフッ素樹脂材料の溶着構造体。   2. The fluororesin material welded structure according to claim 1, wherein the core material has a prismatic shape or a cylindrical shape. 請求項１記載のフッ素樹脂材料の溶着構造体において、前記中芯材は少なくとも１つの端面が前記フッ素樹脂材料の表面に露出していることを特徴とするフッ素樹脂材料の溶着構造体。   2. The fluororesin material welded structure according to claim 1, wherein at least one end face of the core material is exposed on the surface of the fluororesin material. 請求項１から請求項３のいずれか一項記載のフッ素樹脂材料の溶着構造体において、前記中芯材はフッ素樹脂で形成されていることを特徴とするフッ素樹脂材料の溶着構造体。   The welding structure of the fluororesin material according to any one of claims 1 to 3, wherein the core material is formed of a fluororesin. 難溶着性のフッ素樹脂材料を、接合面を介して溶着したフッ素樹脂材料の溶着構造体であって、
前記接合面の一方に凹所が形成され、
前記接合面の他方に突起部が形成され、前記突起部が前記凹所に嵌入されていることを特徴とするフッ素樹脂材料の溶着構造体。 A fluororesin material welded structure in which a hardly weldable fluororesin material is welded via a joint surface,
A recess is formed in one of the joint surfaces;
A welded structure of a fluororesin material, wherein a projection is formed on the other of the joint surfaces, and the projection is fitted into the recess. 請求項１から請求項５のいずれか一項記載のフッ素樹脂材料の溶着構造体において、前記接合面の間には、熱融着性フッ素樹脂材料が介在されて接合されていることを特徴とするフッ素樹脂材料の溶着構造体。   The fluororesin material welded structure according to any one of claims 1 to 5, wherein a heat-sealable fluororesin material is interposed between the joint surfaces and joined. A welded structure of fluororesin material. 請求項６記載のフッ素樹脂材料の溶着構造体において、前記熱融着性フッ素樹脂材料は、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樹脂（ＰＦＡ）または変性ＰＴＦＥであることを特徴とするフッ素樹脂材料の溶着構造体。
7. The fluororesin material welded structure according to claim 6, wherein the heat-sealable fluororesin material is tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer resin (PFA) or modified PTFE. Material welded structure.
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