JP5556061B2 - High frequency dielectric heating welding apparatus and high frequency dielectric heating welding method - Google Patents

High frequency dielectric heating welding apparatus and high frequency dielectric heating welding method Download PDF

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JP5556061B2
JP5556061B2 JP2009133088A JP2009133088A JP5556061B2 JP 5556061 B2 JP5556061 B2 JP 5556061B2 JP 2009133088 A JP2009133088 A JP 2009133088A JP 2009133088 A JP2009133088 A JP 2009133088A JP 5556061 B2 JP5556061 B2 JP 5556061B2
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electrode
welding
dielectric heating
frequency dielectric
high frequency
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JP2010280076A (en
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秀夫 倉島
和之 黒澤
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Toyo Seikan Group Holdings Ltd
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Toyo Seikan Kaisha 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
    • B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
    • 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
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • 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
    • B29C66/43—Joining a relatively small portion of the surface of said 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
    • B29C66/80—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
    • B29C66/8141—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • B29C66/81435—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned comprising several parallel ridges, e.g. for crimping
    • 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
    • B29C66/81811—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 of the welding jaws
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • 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
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

本発明は、プラスチックフィルムなどの溶着対象物を一対の電極で挟み、高周波誘電加熱によりシールする高周波誘電加熱溶着装置及び高周波誘電加熱溶着方法に関する。 The present invention relates to a high-frequency dielectric heating welding apparatus and a high-frequency dielectric heating welding method in which a welding object such as a plastic film is sandwiched between a pair of electrodes and sealed by high-frequency dielectric heating .

高周波誘電加熱溶着は、塩化ビニル等の誘電体損失が大きい物質に対して、高周波電界を与え、内部から生じた発熱を利用して溶着する方法である。
この高周波誘電加熱溶着に関しては、その改良技術が種々提案されている。
例えば、二枚のプラスチック部材を重ね合わせ、溶着したい部分を一対の電極で挟み、これら電極に高周波電圧を加えることで、高周波誘電加熱により溶着する技術が提案されている（例えば、特許文献１参照。）。この技術によれば、一対の電極で挟まれた部分を溶着できる。 The high-frequency dielectric heating welding is a method in which a high-frequency electric field is applied to a substance having a large dielectric loss such as vinyl chloride and the heat generated from the inside is used for welding.
Various techniques for improving the high frequency dielectric heating welding have been proposed.
For example, a technique has been proposed in which two plastic members are overlapped, a portion to be welded is sandwiched between a pair of electrodes, and a high frequency voltage is applied to these electrodes to weld by high frequency dielectric heating (see, for example, Patent Document 1). .) According to this technique, a portion sandwiched between a pair of electrodes can be welded.

ところが、特許文献１に記載の技術は、電極の表面が平坦なため、それら電極間に生じる電界が、電極のエッジに集中してしまっていた。このため、電極で挟まれた部分のうち、そのエッジの近傍では溶着されるものの、それ以外の箇所では溶着されないか溶着が非常に弱くなっていた。
そこで、こうした溶着の偏りをなくすための技術が提案されている。例えば、図１５に示すように、上下に配置された一対の電極１１０、１２０のうち、上側電極１１０の底面と下側電極１２０の上面に、それぞれ複数の突起部１１１、１２１を所定の間隔で形成し、上側電極１１０の突起部１１１と下側電極１２０の突起部１２１が正対するように各電極１１０、１２０を配置したものが提案されている（例えば、特許文献２参照。）。この技術によれば、電極の表面が平坦な場合に比べて電界の生じる箇所が多くなるため、溶着の偏りを低減することができる。 However, in the technique described in Patent Document 1, since the surfaces of the electrodes are flat, the electric field generated between the electrodes is concentrated on the edges of the electrodes. For this reason, although it welded in the vicinity of the edge among the parts pinched | interposed by the electrode, it was not welded in the other location, or welding was very weak.
Therefore, a technique for eliminating such uneven welding has been proposed. For example, as shown in FIG. 15, a plurality of protrusions 111 and 121 are arranged at predetermined intervals on the bottom surface of the upper electrode 110 and the upper surface of the lower electrode 120 among a pair of electrodes 110 and 120 arranged vertically. There has been proposed a structure in which the electrodes 110 and 120 are arranged so that the protrusion 111 of the upper electrode 110 and the protrusion 121 of the lower electrode 120 face each other (see, for example, Patent Document 2). According to this technique, since the number of places where an electric field is generated is increased as compared with the case where the surface of the electrode is flat, it is possible to reduce welding unevenness.

特公平２−３７８５９号公報Japanese Patent Publication No. 2-37859 実登３０１４１４６号公報Noto 3014146 gazette

しかしながら、上述した特許文献２に記載の技術においては、次のような問題があった。
上側電極１１０と下側電極１２０との間に発生する電界は、同図に示すように、突起部１１１のエッジと突起部１２１のエッジが正対する各間でのみ発生し、それ以外の部分では発生しない。このため、電界の発生した部分では溶着が強くなるものの、電界の発生しなかった部分では溶着されないか溶着が弱くなっていた。つまり、溶着の強い箇所と弱い箇所が交互に形成されてしまい、ムラのある溶着となっていた。
特に、容量の大きい液体を内容物とする包装体では、溶着部分の幅（シール幅）を広くするが、少しでも溶着ムラがあると、溶着の弱い部分が決壊し、内容物が漏洩する可能性があった。このため、溶着ムラをなくすとともに、溶着を強固にする技術の提案が求められていた。 However, the technique described in Patent Document 2 described above has the following problems.
As shown in the figure, the electric field generated between the upper electrode 110 and the lower electrode 120 is generated only between the edges of the protrusion 111 and the edge of the protrusion 121 facing each other. Does not occur. For this reason, although welding is strong in the portion where the electric field is generated, it is not welded or weak in the portion where the electric field is not generated. In other words, strong and weak spots were alternately formed, resulting in uneven welding.
In particular, in a package that contains a large volume of liquid as the contents, the width of the welded portion (seal width) is widened. However, if there is even uneven welding, the weakly welded portion may break down and the contents may leak. There was sex. For this reason, there has been a demand for a proposal of a technique for eliminating welding unevenness and strengthening welding.

本発明は、上記の事情にかんがみなされたものであり、溶着ムラをなくして、強固な溶着を実現可能とする高周波誘電加熱溶着装置及び高周波誘電加熱溶着方法の提供を目的とする。 The present invention has been considered in view of the above circumstances, and an object of the present invention is to provide a high-frequency dielectric heating welding apparatus and a high-frequency dielectric heating welding method that can realize strong welding by eliminating welding unevenness.

この目的を達成するため、本発明の高周波誘電溶着装置は、角柱形状に形成された第一電極と、角柱形状に形成された第二電極と、第一電極及び／又は第二電極を所定方向に動かすための押圧用シリンダと、高周波電圧を出力する高周波発振器とを有し、第一電極と第二電極が、それぞれ対向する面に複数の凸部を有し、凸部は、直線状の稜線部を有する山形に形成されるとともに、稜線部が平行に並ぶように対向面上に複数形成されており、第一電極に形成された複数の凸部と第二電極に形成された複数の凸部がそれぞれ正対しない状態で、第一電極と第二電極が配置され、押圧用シリンダを駆動して第一電極と第二電極を近づける方向に動かして、溶着対象物を第一電極と第二電極で挟み、高周波発振器から出力された高周波電圧を第一電極及び第二電極に印加し、押圧用シリンダを駆動して溶着対象物を第一電極と第二電極で押圧し、所定時間後、押圧用シリンダを駆動して、第一電極と第二電極を溶着対象物から離間させることにより、溶着対象物を溶着する構成としてある。 In order to achieve this object, the high frequency dielectric welding apparatus of the present invention includes a first electrode formed in a prismatic shape, a second electrode formed in a prismatic shape, and a first electrode and / or a second electrode in a predetermined direction. A pressing cylinder and a high-frequency oscillator that outputs a high-frequency voltage, the first electrode and the second electrode each have a plurality of convex portions on opposite surfaces, and the convex portions are linear It is formed in a mountain shape having a ridge line part, and a plurality of ridge line parts are formed on the opposing surface so as to be arranged in parallel, and a plurality of convex parts formed on the first electrode and a plurality of formed on the second electrode The first electrode and the second electrode are arranged in a state where the convex portions do not face each other, and the pressing cylinder is driven to move the first electrode and the second electrode closer to each other so that the object to be welded is moved to the first electrode. The high-frequency voltage output from the high-frequency oscillator is sandwiched between the second electrodes and the first The electrode is applied to the electrode and the second electrode, the pressing cylinder is driven to press the object to be welded with the first electrode and the second electrode, and after a predetermined time, the pressing cylinder is driven to supply the first electrode and the second electrode. By separating the welding object from the welding object, the welding object is welded.

また、本発明の高周波誘電加熱溶着方法は、角柱形状に形成された第一電極と角柱形状に形成された第二電極とを対向して配置するとともに、第一電極の対向面に形成された凸部と第二電極の対向面に形成された凸部が、直線状の稜線部を有する山形に形成されるとともに、稜線部が平行に並ぶように対向面上に複数形成されており、第一電極の対向面に形成された複数の凸部と第二電極の対向面に形成された複数の凸部がそれぞれ正対しない状態で、第一電極と第二電極とを配置し、第一電極と第二電極との間に溶着対象物を挿入し、挿入された溶着対象物を第一電極と第二電極で挟み、第一電極及び第二電極に高周波電力を印加し、溶着対象物を第一電極と第二電極で押圧し、所定時間後、第一電極と第二電極を溶着対象物から離間させることにより、溶着対象物を溶着する方法としてある。 In addition, the high frequency dielectric heating welding method of the present invention has a first electrode formed in a prismatic shape and a second electrode formed in a prismatic shape facing each other and formed on the opposing surface of the first electrode. The convex portion formed on the opposing surface of the convex portion and the second electrode is formed in a mountain shape having a linear ridge line portion, and a plurality of ridge line portions are formed on the opposing surface so that the ridge line portions are arranged in parallel . The first electrode and the second electrode are arranged in a state where the plurality of convex portions formed on the opposing surface of the one electrode and the plurality of convex portions formed on the opposing surface of the second electrode are not directly opposed to each other, An object to be welded is inserted between the electrode and the second electrode, the inserted object to be welded is sandwiched between the first electrode and the second electrode, high frequency power is applied to the first electrode and the second electrode, and the object to be welded is Is pressed with the first electrode and the second electrode, and after a predetermined time, the first electrode and the second electrode are separated from the object to be welded. It leads to an a method of welding the welding object.

本発明の高周波誘電加熱溶着装置及び高周波誘電加熱溶着方法によれば、第一電極の複数の凸部と第二電極の複数の凸部が、凸部同士正対しないように、第一電極と第二電極が配置されるため、これら電極間に載置された溶着対象物の溶着部分の全体にわたって電界が発生することから、溶着ムラがなくなり、強固な溶着が可能となる。 According to the high frequency dielectric heating welding apparatus and the high frequency dielectric heating welding method of the present invention, the first electrode and the plurality of convex portions of the first electrode and the plurality of convex portions of the second electrode do not face each other. Since the second electrode is disposed, an electric field is generated over the entire welded portion of the object to be welded placed between these electrodes, so that welding unevenness is eliminated and strong welding is possible.

本発明の実施形態における高周波誘電加熱溶着装置の構成を示す模式図である。It is a schematic diagram which shows the structure of the high frequency dielectric heating welding apparatus in embodiment of this invention. 第一電極の構造を示す斜視図である。It is a perspective view which shows the structure of a 1st electrode. 第二電極の構造を示す斜視図である。It is a perspective view which shows the structure of a 2nd electrode. 第一電極及び第二電極の形状を示す側面図である。It is a side view which shows the shape of a 1st electrode and a 2nd electrode. 第一電極及び第二電極の他の形状を示す側面図である。It is a side view which shows the other shape of a 1st electrode and a 2nd electrode. 電極の構造を示す斜視図である。It is a perspective view which shows the structure of an electrode. 電極の他の構造を示す斜視図である。It is a perspective view which shows the other structure of an electrode. 溶着処理を行う際の第一電極及び第二電極の配置を示す斜視図である。It is a perspective view which shows arrangement | positioning of the 1st electrode at the time of performing a welding process, and a 2nd electrode. 電極間に発生する電界の分布を示す図である。It is a figure which shows distribution of the electric field which generate | occur | produces between electrodes. 電極間に発生する電界の分布を示す図であって、（ｉ）は、第二電極４０を１／４ピッチずらした場合、（ii）は、第二電極４０を１／２ピッチずらした場合を示す。It is a figure which shows distribution of the electric field which generate | occur | produces between electrodes, Comprising: (i) is when the 2nd electrode 40 is shifted 1/4 pitch, (ii) is the case where the 2nd electrode 40 is shifted 1/2 pitch Indicates. 冷却流路を備えた電極の構造を示す斜視図である。It is a perspective view which shows the structure of the electrode provided with the cooling flow path. 溶着処理後の溶着対象物を示す斜視図である。It is a perspective view which shows the welding target object after a welding process. 電極の他の構造を示す斜視図である。It is a perspective view which shows the other structure of an electrode. 溶着対象物であるプラスチックフィルムが長尺の場合の電極等の配置を示す斜視図である。It is a perspective view which shows arrangement | positioning of an electrode etc. in case the plastic film which is a welding target object is elongate. 従来の高周波誘電加熱溶着装置における電極の配置と、電極間に発生する電界の分布を示す図である。It is a figure which shows arrangement | positioning of the electrode in the conventional high frequency dielectric heating welding apparatus, and distribution of the electric field which generate | occur | produces between electrodes.

以下、本発明に係る高周波誘電加熱溶着装置及び高周波誘電加熱溶着方法の好ましい実施形態について、図面を参照して説明する。 Hereinafter, preferred embodiments of a high-frequency dielectric heating welding apparatus and a high-frequency dielectric heating welding method according to the present invention will be described with reference to the drawings.

［高周波誘電加熱溶着装置の実施形態］
まず、本発明の高周波誘電加熱溶着装置の実施形態について、図１を参照して説明する。
同図は、本実施形態の高周波誘電加熱溶着装置の構成を示す模式図である。 [Embodiment of high-frequency dielectric heating welding apparatus ]
First, an embodiment of the high frequency dielectric heating welding apparatus of the present invention will be described with reference to FIG.
The figure is a schematic diagram showing the configuration of the high-frequency dielectric heating welding apparatus of the present embodiment.

図１に示すように、高周波誘電加熱溶着装置１は、高周波発振器１０と、整合器２０と、第一電極３０と、第二電極４０と、押圧用シリンダ５０とを備えている。
なお、本実施形態においては、第一電極３０と第二電極４０とを併せて「高周波誘電加熱溶着用電極」という。 As shown in FIG. 1, the high frequency dielectric heating welding apparatus 1 includes a high frequency oscillator 10, a matching unit 20, a first electrode 30, a second electrode 40, and a pressing cylinder 50.
In the present embodiment, the first electrode 30 and the second electrode 40 are collectively referred to as “high-frequency dielectric heating welding electrode”.

高周波発振器１０は、第一電極３０と第二電極４０との間に印加される高周波電圧を出力する。
整合器２０は、電極３０と電極４０との間のインピーダンスと高周波発振器１０の出力インピーダンスとの整合をとる。 The high frequency oscillator 10 outputs a high frequency voltage applied between the first electrode 30 and the second electrode 40.
The matching unit 20 matches the impedance between the electrode 30 and the electrode 40 with the output impedance of the high-frequency oscillator 10.

第一電極３０は、図２に示すように、角柱形状に形成されており、底面３１には、凸部３２と、凹部３３が形成されている。なお、底面３１は、第二電極４０に対向する面（対向面）となっている。
凸部３２は、第一電極３０の基体３４から隆起形成された部分である。
この凸部３２は、例えば、同図に示すように、山形に形成することができ、さらに稜線部を直線状に形成することができる。
また、凸部３２は、複数形成することができる。これら複数の凸部３２は、稜線部が平行に並ぶように形成することができる。 As shown in FIG. 2, the first electrode 30 is formed in a prismatic shape, and a convex portion 32 and a concave portion 33 are formed on the bottom surface 31. The bottom surface 31 is a surface (facing surface) that faces the second electrode 40.
The convex portion 32 is a portion that is raised from the base body 34 of the first electrode 30.
For example, as shown in the figure, the convex portion 32 can be formed in a mountain shape, and the ridge line portion can be formed in a straight line.
A plurality of convex portions 32 can be formed. The plurality of convex portions 32 can be formed such that the ridge portions are arranged in parallel.

なお、同図においては、凸部３２の稜線方向が第一電極３０の基体３４の長手方向と同じ方向になっている。また、複数の凸部３２は、第一電極３０の基体３４の幅方向に並べて形成されている。
また、同図において、凸部３２の数は、六つとなっているが、六つに限るものではなく、任意とすることができる。 In the figure, the ridge line direction of the convex portion 32 is the same as the longitudinal direction of the base 34 of the first electrode 30. The plurality of convex portions 32 are formed side by side in the width direction of the base 34 of the first electrode 30.
Moreover, in the same figure, although the number of the convex parts 32 is six, it is not restricted to six, It can be made arbitrary.

凹部３３は、複数の凸部３２の各間に形成された、谷間の部分であって、稜線部に対する縦谷部として形成されている。
なお、同図において、凹部３３の数は、五つとなっているが、五つに限るものではなく、凸部３２に応じた数とすることができる。 The concave portion 33 is a valley portion formed between each of the plurality of convex portions 32 and is formed as a vertical valley portion with respect to the ridge line portion.
In addition, in the same figure, although the number of the recessed parts 33 is five, it is not restricted to five, It can be made into the number according to the convex part 32. FIG.

第二電極４０は、図３に示すように、角柱形状に形成されており、上面４１には、凸部４２と、凹部４３が形成されている。なお、上面４１は、第一電極３０に対向する面（対向面）となっている。
凸部４２及び凹部４３は、第一電極３０の凸部３２及び凹部３３と同様の形状を有している。 As shown in FIG. 3, the second electrode 40 is formed in a prismatic shape, and a convex portion 42 and a concave portion 43 are formed on the upper surface 41. The upper surface 41 is a surface (facing surface) that faces the first electrode 30.
The convex portion 42 and the concave portion 43 have the same shape as the convex portion 32 and the concave portion 33 of the first electrode 30.

なお、同図において、凸部４２の数は、七つとなっているが、七つに限るものではなく、任意とすることができる。同様に、同図において、凹部４３の数は、六つとなっているが、六つに限るものではなく、凸部４２に応じた数とすることができる。
また、第一電極３０の有する凸部３２の数と、第二電極４０の有する凸部４２の数は、同じであってもよく、あるいは異なっていてもよい。 In addition, in the same figure, although the number of the convex parts 42 is seven, it is not restricted to seven, It can be made arbitrary. Similarly, although the number of the recessed parts 43 is six in the same figure, it is not restricted to six, It can be made into the number according to the convex part 42. FIG.
Moreover, the number of the convex parts 32 which the 1st electrode 30 has, and the number of the convex parts 42 which the 2nd electrode 40 has may be the same, or may differ.

さらに、複数の凸部３２の間隔（ピッチ）と、複数の凸部４２の間隔（ピッチ）は、それぞれ任意とすることができる。
ただし、溶着対象物の厚さに応じて、それら凸部３２等の間隔を決めることができる。例えば、溶着対象物の厚さが薄いときは、凸部３２等の間隔を狭くし、一方、溶着対象物の厚さが厚いときは、凸部３２等の間隔を広くすることが望ましい。
また、本実施形態において、第一電極３０の凸部３２と第二電極４０の凸部４２は、正対しないようにずらして配置することから、凸部３２の間隔と凸部４２の間隔は、ほぼ同じにすることが望ましい。 Furthermore, the interval (pitch) between the plurality of convex portions 32 and the interval (pitch) between the plurality of convex portions 42 can be arbitrarily set.
However, according to the thickness of the object to be welded, the interval between the convex portions 32 and the like can be determined. For example, when the thickness of the object to be welded is thin, it is desirable to narrow the interval between the convex portions 32 and the like, while when the thickness of the object to be welded is thick, the interval between the convex portions 32 and the like is widened.
Further, in the present embodiment, the convex portion 32 of the first electrode 30 and the convex portion 42 of the second electrode 40 are arranged so as not to face each other, so that the interval between the convex portions 32 and the interval between the convex portions 42 is as follows. It is desirable that they be almost the same.

さらに、図２、図３においては、凸部３２及び凸部４２の断面形状（又は、凸部３２及び凸部４２の先端部の形状）を二等辺三角形としてあるが、断面形状（又は先端部の形状）は、二等辺三角形に限るものではなく、例えば、図４（ｉ）〜（iv）に示すように、四角形（同図（ｉ））、五角形（又は六角形、同図（ii））、円形（又は楕円形、同図（iii））、不等辺三角形（鋸歯状、同図（iv））などとすることができる。
なお、同図（ｉ）〜（iv）は、第一電極３０の凸部３２及び凹部３３の形状と第二電極４０の凸部４２及び凹部４３の形状が同じ場合を示している。 Further, in FIGS. 2 and 3, the cross-sectional shape of the convex portion 32 and the convex portion 42 (or the shape of the tip portion of the convex portion 32 and the convex portion 42) is an isosceles triangle. Is not limited to an isosceles triangle. For example, as shown in FIGS. 4 (i) to (iv), a quadrangle ((i) in FIG. 4), a pentagon (or hexagon, (ii) in FIG. ), A circle (or an ellipse, FIG. (Iii)), an unequal triangle (a sawtooth, (iv)).
In addition, the same figure (i)-(iv) has shown the case where the shape of the convex part 32 and the recessed part 33 of the 1st electrode 30 and the shape of the convex part 42 and the recessed part 43 of the 2nd electrode 40 are the same.

また、第一電極３０の凸部３２及び凹部３３の形状と第二電極４０の凸部４２及び凹部４３の形状は、図５（ｉ）〜（iii）に示すように形成することができる。
すなわち、同図（ｉ）に示すように、第一電極３０の凸部３２が三角形状であって斜辺が窪んだ円弧状になっており、凹部３３が隣り合う凸部３２の各斜辺で形成された円弧状とし、第二電極４０の凸部４２がふくらんだ円弧状、凹部４３がそのふくらんだ円弧に挟まれた谷状とすることができる。 Moreover, the shape of the convex part 32 and the recessed part 33 of the 1st electrode 30 and the shape of the convex part 42 and the recessed part 43 of the 2nd electrode 40 can be formed as shown to FIG.5 (i)-(iii).
That is, as shown in FIG. 5I, the convex portion 32 of the first electrode 30 has a triangular shape and has an arc shape with a concave hypotenuse, and a concave portion 33 is formed by each hypotenuse of the adjacent convex portion 32. The convex portion 42 of the second electrode 40 may be a bulging arc shape, and the concave portion 43 may be a valley shape sandwiched between the bulging arcs.

さらに、同図（ii）に示すように、第一電極３０の凸部３２が三角形状であって斜辺が窪んだ楕円の円弧状となっており、凹部３３が隣り合う凸部３２の各斜辺で形成された楕円の円弧状、第二電極４０の凸部４２がふくらんだ楕円の円弧状、凹部４３がそのふくらんだ楕円に挟まれた谷状とすることができる。
また、同図（iii）に示すように、第一電極３０の凸部３２が四角形状、凹部３３が窪んだ五角形状、第二電極４０の凸部４２が五角形状、凹部４３が四角形状とすることができる。
このように、第一電極３０の凸部３２及び凹部３３の形状と第二電極４０の凸部４２及び凹部４３の形状は、それぞれ異なるように形成することもできる。 Further, as shown in FIG. 2 (ii), the convex portion 32 of the first electrode 30 has a triangular shape and has an elliptical arc shape with a concave hypotenuse, and each hypotenuse of the convex portion 32 adjacent to the concave portion 33. The elliptical arc shape formed by the above-described method, the elliptical arc shape in which the convex portion 42 of the second electrode 40 is inflated, and the concave portion 43 in the valley shape sandwiched by the inflated ellipse.
As shown in FIG. 3C, the convex portion 32 of the first electrode 30 has a quadrangular shape, the pentagonal shape with the concave portion 33 depressed, the convex portion 42 of the second electrode 40 has a pentagonal shape, and the concave portion 43 has a square shape. can do.
Thus, the shape of the convex part 32 and the recessed part 33 of the 1st electrode 30 and the shape of the convex part 42 and the recessed part 43 of the 2nd electrode 40 can also be formed different, respectively.

また、第一電極３０の凸部３２（第二電極４０の凸部４２）は、図２（図３）においては、底面３１（上面４１）において幅方向に複数形成されているが、凸部３２（凸部４２）は、幅方向に複数形成されることに限るものではなく、例えば、図６に示すように、長手方向に複数形成することもできる。さらに、図７に示すように、幅方向と長手方向のそれぞれに対して斜め方向に複数形成することもできる。   Further, in FIG. 2 (FIG. 3), a plurality of convex portions 32 of the first electrode 30 (the convex portions 42 of the second electrode 40) are formed in the width direction on the bottom surface 31 (upper surface 41). A plurality of 32 (convex portions 42) are not limited to being formed in the width direction. For example, as shown in FIG. 6, a plurality of protrusions 42 can be formed in the longitudinal direction. Furthermore, as shown in FIG. 7, it is also possible to form a plurality in an oblique direction with respect to each of the width direction and the longitudinal direction.

第一電極３０と第二電極４０は、図８に示すように、溶着対象物を介して、対向する位置に配置される。このとき、第一電極３０の複数の凸部３２と第二電極４０の複数の凸部４２は、それら凸部同士が正対しないようにずれた状態で配置される。   As shown in FIG. 8, the first electrode 30 and the second electrode 40 are disposed at positions facing each other with the object to be welded interposed therebetween. At this time, the plurality of convex portions 32 of the first electrode 30 and the plurality of convex portions 42 of the second electrode 40 are arranged in a state of being shifted so that the convex portions do not face each other.

このように配置したときに発生する電界の分布を図９に示す。
同図に示すように、電界は、第一電極３０の凸部３２の頂部（稜線部）と第二電極４０の凸部４２の頂部（稜線部）との間に発生する。また、電界は、第一電極３０の一つの凸部３２から、第二電極４０の二つの凸部４２に対して発生する（同様に、電界は、第二電極４０の一つの凸部４２から、第一電極３０の二つの凸部３２に対して発生する）。さらに、電界は、凸部３２と凸部４２とを結ぶ線を長辺とする楕円状に広がりをもって発生する。このため、溶着対象物において、第一電極３０と第二電極４０で挟まれた部分のほとんどで電界が発生することになる。これにより、溶着しようとする箇所の全体で、ほぼ均等に発熱が生じるので、ムラのない溶着を実現できる。 FIG. 9 shows the distribution of the electric field generated when arranged in this way.
As shown in the figure, the electric field is generated between the top portion (ridge line portion) of the convex portion 32 of the first electrode 30 and the top portion (ridge line portion) of the convex portion 42 of the second electrode 40. Further, an electric field is generated from one convex portion 32 of the first electrode 30 to two convex portions 42 of the second electrode 40 (similarly, an electric field is generated from one convex portion 42 of the second electrode 40. And occurs with respect to the two convex portions 32 of the first electrode 30). Further, the electric field is generated in an elliptical shape having a long side as a line connecting the convex portion 32 and the convex portion 42. For this reason, in the welding object, an electric field is generated in most of the portion sandwiched between the first electrode 30 and the second electrode 40. Thereby, since heat is generated almost evenly in the entire portion to be welded, welding without unevenness can be realized.

なお、図９に示す電界の分布は、第一電極３０の凸部３２と第二電極４０の凸部４２が正対しないようにずらして配置したことで実現している。この電界の分布は、図１５に示す電極１１０、１２０の配置では得られないものである。
つまり、図９に示すように、第一電極３０の凸部３２と第二電極４０の凸部４２が正対しないようにずらしたことで、第一電極３０の一つの凸部３２に第二電極４０の二つの凸部４２が接近するようになり、電界が、凸部３２又は凸部４２の頂部から斜め方向に発生する。これにより、電界は、溶着対象物の溶着部分の全体で発生させることができる。これに対し、図１５に示す場合は、電極１１０の突起部１１１のエッジと電極１２０の突起部１２１のエッジが正対する箇所でしか電界が発生せず、電界の分布が不均一になる。
このように、本実施形態の高周波誘電加熱溶着装置は、溶着しようとする部分の全体で電界の分布がほぼ均等になるので、ムラのない溶着を実現できる。 The electric field distribution shown in FIG. 9 is realized by arranging the convex portions 32 of the first electrode 30 and the convex portions 42 of the second electrode 40 so as not to face each other. This electric field distribution cannot be obtained with the arrangement of the electrodes 110 and 120 shown in FIG.
That is, as shown in FIG. 9, the convex portion 32 of the first electrode 30 and the convex portion 42 of the second electrode 40 are shifted so as not to face each other, so that the second convex portion 32 of the first electrode 30 is moved to the second convex portion 32. The two convex portions 42 of the electrode 40 come close to each other, and an electric field is generated in an oblique direction from the convex portion 32 or the top of the convex portion 42. Thereby, an electric field can be generated in the whole welding part of a welding target object. On the other hand, in the case shown in FIG. 15, an electric field is generated only at a position where the edge of the protruding portion 111 of the electrode 110 and the edge of the protruding portion 121 of the electrode 120 face each other, and the electric field distribution becomes uneven.
As described above, the high-frequency dielectric heating welding apparatus of the present embodiment can achieve uniform welding because the electric field distribution is substantially uniform over the entire portion to be welded.

さらに、図１０（ｉ）、（ii）を用いて、第一電極３０の凸部３２と第二電極４０の凸部４２とのずれの程度と、これにより発生する電界との関係について説明する。
例えば、同図（ｉ）に示すように、第二電極４０の凸部４２の頂部が第一電極３０の凸部３２の斜面の中程に対向している場合（第一電極３０の凸部３２と第二電極４０の凸部４２が正対した状態を基準として、第二電極４０を同図（ｉ）の右方向へ１／４ピッチずらした場合）、これら第二電極４０と第一電極３０との間には、同図（ｉ）に示す電界が分布する。つまり、溶着対象物のうち第二電極４０と第一電極３０とで挟まれた部分の全体に電界が発生し、電界の発生していない部分がほとんどなくなる。このことから、第一電極３０の凸部３２と第二電極４０の凸部４２が正対しないように少しずらしただけでも、電界の不均一が改善され、溶着対象物の溶着部分の全体で発熱が起こり、この部分が溶着される。この点は、図１５に示す電界分布と比較しても明らかに異なっていることがわかる。 Furthermore, the relationship between the degree of deviation between the convex portion 32 of the first electrode 30 and the convex portion 42 of the second electrode 40 and the electric field generated thereby will be described with reference to FIGS. .
For example, as shown in FIG. 5I, when the top of the convex portion 42 of the second electrode 40 faces the middle of the slope of the convex portion 32 of the first electrode 30 (the convex portion of the first electrode 30). 32 and the convex part 42 of the second electrode 40 facing each other, when the second electrode 40 is shifted by 1/4 pitch in the right direction of FIG. Between the electrodes 30, the electric field shown in FIG. That is, an electric field is generated in the entire portion sandwiched between the second electrode 40 and the first electrode 30 in the object to be welded, and there is almost no portion where no electric field is generated. Therefore, even if the convex portion 32 of the first electrode 30 and the convex portion 42 of the second electrode 40 are slightly shifted so as not to face each other, the non-uniformity of the electric field is improved, and the entire welded portion of the welding object is improved. An exotherm occurs and this part is welded. This point is clearly different from the electric field distribution shown in FIG.

ただし、発生した電界をさらに詳しく見てみると、電界強度に差が生じている。例えば、図１０（ｉ）において、第一電極３０における一つの凸部３２−１に着目すると、この近くには、第二電極４０における二つの凸部（４２−１及び４２−２）が位置している。ここで、凸部３２−１と凸部４２−１との距離は、凸部３２−１と凸部４２−２との距離よりも短い。このため、凸部３２−１と凸部４２−１との間に発生する電界の強度が強くなり、一方、凸部３２−１と凸部４２−２との間に発生する電界の強度が弱くなる。そうすると、電界強度の強いとことが溶着が強くなり、一方、電界強度の弱いところが、溶着が弱くなってしまう。   However, when the generated electric field is examined in more detail, there is a difference in electric field strength. For example, in FIG. 10 (i), when attention is paid to one convex part 32-1 in the first electrode 30, two convex parts (42-1 and 42-2) in the second electrode 40 are located in the vicinity thereof. doing. Here, the distance between the convex part 32-1 and the convex part 42-1 is shorter than the distance between the convex part 32-1 and the convex part 42-2. For this reason, the strength of the electric field generated between the convex portion 32-1 and the convex portion 42-1, and the strength of the electric field generated between the convex portion 32-1 and the convex portion 42-2 are increased. become weak. If it does so, welding with strong electric field strength will become strong, on the other hand, the place where electric field strength is weak will become weak.

これに対し、同図（ii）に示すように、第一電極３０の凸部３２の頂部が第二電極４０の凹部４３に対向して配置した場合（第一電極３０の凸部３２と第二電極４０の凸部４２が正対した状態を基準として、第二電極４０を同図（ii）の右方向へ１／２ピッチずらした場合）、これら第一電極３０と第二電極４０とで挟まれた部分の全体に電界が発生し、電界の発生していない部分がほとんどなくなる。
また、第一電極３０の凸部３２−１の頂部と第二電極４０の凸部４２−１の頂部との距離と、第一電極３０の凸部３２−１の頂部と第二電極４０の凸部４２−２の頂部との距離とはほとんど同じになる。このため、凸部３２−１と凸部４２−１との間で発生する電界の強度と、凸部３２−１と凸部４２−２との間で発生する電界の強度は、同じになる。これにより、溶着対象物における溶着部分の全体で均一に電界が生じるため、ムラのない強固な溶着が可能となる。 On the other hand, as shown in FIG. 2 (ii), when the top of the convex portion 32 of the first electrode 30 is disposed opposite to the concave portion 43 of the second electrode 40 (the convex portion 32 of the first electrode 30 and the second With reference to the state where the convex portions 42 of the two electrodes 40 face each other as a reference, the second electrode 40 is shifted by 1/2 pitch to the right in FIG. An electric field is generated in the entire portion sandwiched between the layers, and there are almost no portions where no electric field is generated.
Also, the distance between the top of the convex portion 32-1 of the first electrode 30 and the top of the convex portion 42-1 of the second electrode 40, the top of the convex portion 32-1 of the first electrode 30, and the second electrode 40 The distance from the top of the convex portion 42-2 is almost the same. For this reason, the strength of the electric field generated between the convex portion 32-1 and the convex portion 42-1 is the same as the strength of the electric field generated between the convex portion 32-1 and the convex portion 42-2. . As a result, an electric field is uniformly generated in the entire welded portion of the object to be welded, so that strong welding without unevenness is possible.

これら第一電極３０と第二電極４０には、図１１に示すように、冷却媒体を通すための冷却流路３５（４５）を穿設することができる。
冷却流路３５（４５）は、冷却媒体が流入される入口側開口３６（４６）と、冷却媒体を排出する出口側開口３７（４７）と、これらを繋ぐ流路部３８（４８）とを有している。
入口側開口３６（４６）と出口側開口３７（４７）は、いずれも電極３０（４０）の側面又は底面に形成されており、流路部３８（４８）は、電極３０（４０）の基体３４（４４）の内部に形成されている。 As shown in FIG. 11, the first electrode 30 and the second electrode 40 can be provided with cooling channels 35 (45) for allowing the cooling medium to pass therethrough.
The cooling flow path 35 (45) includes an inlet side opening 36 (46) into which the cooling medium flows, an outlet side opening 37 (47) through which the cooling medium is discharged, and a flow path portion 38 (48) connecting them. Have.
The inlet side opening 36 (46) and the outlet side opening 37 (47) are both formed on the side surface or the bottom surface of the electrode 30 (40), and the flow path portion 38 (48) is the base of the electrode 30 (40). 34 (44).

この冷却流路３５（４５）に通す冷却媒体には、例えば、水や空気などを用いることができる。
冷却媒体が水の場合、入口側開口３６（４６）には、水を供給するためのポンプ（図示せず）が接続される。また、冷却媒体が空気の場合、入口側開口３６（４６）には、空気を供給するためのコンプレッサ（図示せず）が接続される。
さらに、出口側開口３７（４７）には、排出された水を受けるための貯水タンク（図示せず）、あるいは、出口側開口３７（４７）からの空気を外部に排出するための排気管（図示せず）を接続することができる。また、出口側開口３７（４７）には、冷却媒体を再利用するための循環系（図示せず）を接続することもできる。この場合、冷却媒体は、ポンプ又はコンプレッサを介して入口側開口３６（４６）に再度供給される。
このような構成の冷却流路３５（４５）に冷却媒体を通すことにより、溶着対象物からの発熱による電極３０（４０）の劣化や変形を防止できる。 For example, water or air can be used as the cooling medium passing through the cooling flow path 35 (45).
When the cooling medium is water, a pump (not shown) for supplying water is connected to the inlet side opening 36 (46). When the cooling medium is air, a compressor (not shown) for supplying air is connected to the inlet side opening 36 (46).
Further, the outlet side opening 37 (47) has a water storage tank (not shown) for receiving the discharged water, or an exhaust pipe for discharging the air from the outlet side opening 37 (47) to the outside ( (Not shown) can be connected. Further, a circulation system (not shown) for reusing the cooling medium can be connected to the outlet side opening 37 (47). In this case, the cooling medium is supplied again to the inlet side opening 36 (46) via a pump or a compressor.
By passing the cooling medium through the cooling flow path 35 (45) having such a configuration, it is possible to prevent the electrode 30 (40) from being deteriorated or deformed due to heat generated from the object to be welded.

押圧用シリンダ５０は、圧縮空気の吸入・排出により、第一電極３０及び第二電極４０を所定方向（図１においては、上下方向）に動かすための装置である。
この押圧用シリンダ５０には、第一電極３０を動かす押圧用第一シリンダ５１と、第二電極４０を動かす押圧用第二シリンダ５２がある。
例えば、第一電極３０と第二電極４０との間に溶着対象物が挿入されている場合において、押圧用シリンダ５０を駆動して、それら第一電極３０と第二電極４０とを近づける方向に動かすと、溶着対象物が挟み込まれ押圧される。これを溶着処理中に行うと、挟まれた箇所の溶着が促進される。
一方、押圧用シリンダ５０を駆動して第一電極３０と第二電極４０とを離間させると、溶着対象物の挿入・排出が可能となる。 The pressing cylinder 50 is a device for moving the first electrode 30 and the second electrode 40 in a predetermined direction (vertical direction in FIG. 1) by sucking and discharging compressed air.
The pressing cylinder 50 includes a pressing first cylinder 51 that moves the first electrode 30 and a pressing second cylinder 52 that moves the second electrode 40.
For example, when a welding object is inserted between the first electrode 30 and the second electrode 40, the pressing cylinder 50 is driven to bring the first electrode 30 and the second electrode 40 closer to each other. When moved, the object to be welded is sandwiched and pressed. If this is performed during the welding process, the welding of the pinched part is promoted.
On the other hand, when the pressing cylinder 50 is driven to separate the first electrode 30 and the second electrode 40, the object to be welded can be inserted and discharged.

なお、押圧用シリンダ５０は、本実施形態においては、二つ備えた構成としてあるが、二つに限るものではなく、一つだけ備えた構成とすることもできる。
すなわち、第二電極４０は、固定台に載置して固定とし、第一電極３０に押圧用シリンダ５０を接続して動かすことができるようにすることもできる。 In addition, in this embodiment, although the cylinder 50 for a press is set as the structure provided with two, it is not restricted to two, It can also be set as the structure provided with only one.
That is, the second electrode 40 can be fixed by being placed on a fixed base, and can be moved by connecting the pressing cylinder 50 to the first electrode 30.

［高周波誘電加熱溶着方法］
次に、本実施形態の高周波誘電加熱溶着装置の動作（高周波誘電加熱溶着方法）について、図１を参照して説明する。
押圧用第一シリンダ５１と押圧用第二シリンダ５２とを駆動して、第一電極３０と第二電極４０とを離間させておく。 [High-frequency dielectric heating welding method]
Next, the operation (high frequency dielectric heating welding method) of the high frequency dielectric heating welding apparatus of this embodiment will be described with reference to FIG.
The first pressing cylinder 51 and the second pressing cylinder 52 are driven to separate the first electrode 30 and the second electrode 40 from each other.

これら第二電極４０と第一電極３０との間に溶着対象物を挿入する。ここで、溶着対象物のうち溶着しようとする箇所が第二電極４０の直上にくるように、溶着対象物をセットする。
セットが完了すると、押圧用第一シリンダ５１と押圧用第二シリンダ５２とを駆動して、溶着しようとする箇所を、第一電極３０と第二電極４０で挟む。
このとき、第一電極３０の凸部３２と第二電極４０の凸部４２は、図１に示すように、互いに正対しない位置となっている。 A welding object is inserted between the second electrode 40 and the first electrode 30. Here, the welding object is set so that the portion to be welded of the welding object is directly above the second electrode 40.
When the setting is completed, the pressing first cylinder 51 and the pressing second cylinder 52 are driven, and the portion to be welded is sandwiched between the first electrode 30 and the second electrode 40.
At this time, the convex portion 32 of the first electrode 30 and the convex portion 42 of the second electrode 40 are in positions that do not face each other as shown in FIG.

高周波発振器１０を起動して、第一電極３０と第二電極４０との間に高周波電圧を印加すると、図９に示すように、第一電極３０の凸部３２と第二電極４０の凸部４２との間に電界が発生する。これにより、溶着対象物の溶着しようとする箇所では、内部から発熱し、溶着対象物であるプラスチックフィルム同士が溶着する。   When the high-frequency oscillator 10 is activated and a high-frequency voltage is applied between the first electrode 30 and the second electrode 40, as shown in FIG. 9, the convex portion 32 of the first electrode 30 and the convex portion of the second electrode 40. An electric field is generated between Thereby, in the location where the welding object is to be welded, heat is generated from the inside, and the plastic films that are the welding objects are welded together.

発熱が始まると、第一電極３０の冷却流路３５と第二電極４０の冷却流路４５に冷却媒体を通して、各電極３０、４０を冷却する。
また、押圧用第一シリンダ５１と押圧用第二シリンダ５２とを駆動して、第一電極３０と第二電極４０とを近づける方向に動かす。これにより、溶着部分は、第一電極３０と第二電極４０に挟まれながら押圧される。
このとき、溶着対象物は、発熱した部分の粘性が低くなっている。このため、その溶着部分は、第一電極３０の凸部３２及び凹部３３、第二電極４０の凸部４２及び凹部４３の形状に合わせて変形する。 When heat generation starts, the electrodes 30 and 40 are cooled by passing a cooling medium through the cooling channel 35 of the first electrode 30 and the cooling channel 45 of the second electrode 40.
Further, the first pressing cylinder 51 and the second pressing cylinder 52 are driven to move the first electrode 30 and the second electrode 40 in the direction in which they are brought closer. Thereby, the welded portion is pressed while being sandwiched between the first electrode 30 and the second electrode 40.
At this time, the object to be welded has a low viscosity at the portion where heat is generated. Therefore, the welded portion is deformed in accordance with the shapes of the convex portion 32 and the concave portion 33 of the first electrode 30 and the convex portion 42 and the concave portion 43 of the second electrode 40.

溶着が完了すると、押圧用第一シリンダ５１と押圧用第二シリンダ５２とを駆動して、第一電極３０と第二電極４０とを離間させ、元の位置に戻す。そして、溶着対象物を取り出す。
溶着対象物は、図１２に示すように、第一電極３０と第二電極４０とで挟まれた部分が溶着される。この溶着部分では、図９に示すように電界がほぼ均等に発生するため、溶着部分の全体で発熱が起こり、ムラなく均一な溶着が可能となる。 When the welding is completed, the first pressing cylinder 51 and the second pressing cylinder 52 are driven to separate the first electrode 30 and the second electrode 40 and return them to their original positions. Then, the welding object is taken out.
As shown in FIG. 12, the portion to be welded is welded between the first electrode 30 and the second electrode 40. In this welded portion, as shown in FIG. 9, the electric field is generated almost uniformly, so that heat is generated in the entire welded portion, and uniform welding can be performed without unevenness.

［実施例］
次に、実施例について、説明する。 [Example]
Next, examples will be described.

（実施例１）
溶着対象物として、二層構造のプラスチックフィルムを二枚用意した。
二層構造のうちの一層は、ナイロンで形成されており、厚さは、１５μｍであった。他の一層は、ＬＤＰＥ（Low-Density Polyethylene：低密度ポリエチレン）で形成されており、厚さは、１５０μｍであった。
このような構造を有するプラスチックフィルムは、一般に、液体洗剤などの内容物が充填されるパウチ容器に用いられている。 Example 1
Two plastic films having a two-layer structure were prepared as objects to be welded.
One layer of the two-layer structure was made of nylon and the thickness was 15 μm. The other layer was made of LDPE (Low-Density Polyethylene) and had a thickness of 150 μm.
The plastic film having such a structure is generally used for a pouch container filled with contents such as a liquid detergent.

高周波誘電加熱溶着装置としては、図１に示す構成を備えた高周波誘電加熱溶着装置１を用意した。
また、第一電極３０は、図２に示す形状のもの、第二電極４０は、図３に示す形状のものを用意した。
なお、高周波発振器１０は、ドレスラー製、出力３ｋＷ、周波数４０．６８ＭＨｚであり、整合器２０は、アステック製のものを使用した。 As a high-frequency dielectric heating welding apparatus, a high-frequency dielectric heating welding apparatus 1 having the configuration shown in FIG. 1 was prepared.
Further, the first electrode 30 was prepared in the shape shown in FIG. 2, and the second electrode 40 was prepared in the shape shown in FIG.
The high-frequency oscillator 10 was made by Dressler, the output was 3 kW, and the frequency was 40.68 MHz, and the matching unit 20 was made by Astec.

二枚のプラスチックフィルムは、ナイロン製の層を外層とし、ＬＤＰＥ製の層を内層として重ね合わせ、これを第一電極３０と第二電極４０との間に挿入した。このとき、溶着しようとする部分が第一電極３０の直下、第二電極４０の直上に位置するように、プラスチックフィルムをセットした。   The two plastic films were laminated with the nylon layer as the outer layer and the LDPE layer as the inner layer, and this was inserted between the first electrode 30 and the second electrode 40. At this time, the plastic film was set so that the portion to be welded was located immediately below the first electrode 30 and directly above the second electrode 40.

前述の高周波誘電加熱溶着方法にしたがって、プラスチックフィルムを溶着した。
溶着条件は、高周波発振器１０の出力を１５０Ｗ、シール時間を１５秒とした。
その結果、プラスチックフィルムの所望の部分を溶着することができた。特に、溶着した部分は、幅が０．８ｃｍ、長さが５ｃｍであったが、その全体で均一に溶着することができた。 A plastic film was welded according to the above-described high frequency dielectric heating welding method.
The welding conditions were 150 W for the output of the high-frequency oscillator 10 and 15 seconds for the sealing time.
As a result, a desired portion of the plastic film could be welded. In particular, the welded portion had a width of 0.8 cm and a length of 5 cm, but could be welded uniformly throughout.

（実施例２）
溶着対象物として、四層構造のプラスチックフィルムを二枚用意した。
四層構造のうちの第一層は、ＰＥＴ（Polyethylene Terephthalate：ポリエチレンテレフタレート）で形成されており、厚さは、１２μｍであった。第二層と第三層は、ナイロンで形成されており、厚さは、いずれも１５μｍであった。第四層は、ＰＰ（Polypropylene：ポリプロピレン）で形成されており、厚さは、６０μｍであった。 (Example 2)
Two plastic films having a four-layer structure were prepared as objects to be welded.
The first layer of the four-layer structure is made of PET (Polyethylene Terephthalate) and has a thickness of 12 μm. The second layer and the third layer were made of nylon and both had a thickness of 15 μm. The fourth layer is made of PP (Polypropylene) and has a thickness of 60 μm.

高周波誘電加熱溶着装置としては、実施例１と同様に、図１に示す構成の高周波誘電加熱溶着装置１を用意した。
また、第一電極３０は、図２に示す形状のもの、第二電極４０は、図３に示す形状のものを用意した。 As a high-frequency dielectric heating welding apparatus, a high-frequency dielectric heating welding apparatus 1 having the configuration shown in FIG.
Further, the first electrode 30 was prepared in the shape shown in FIG. 2, and the second electrode 40 was prepared in the shape shown in FIG.

二枚のプラスチックフィルムは、第一層を外層とし、第四層を内層として重ね合わせ、これを第一電極３０と第二電極４０との間に挿入した。このとき、溶着部分が第一電極３０の直下、第二電極４０の直上に位置するように、プラスチックフィルムをセットした。   The two plastic films were stacked with the first layer as the outer layer and the fourth layer as the inner layer, and this was inserted between the first electrode 30 and the second electrode 40. At this time, the plastic film was set so that the welded portion was located immediately below the first electrode 30 and directly above the second electrode 40.

前述の高周波誘電加熱溶着方法にしたがって、プラスチックフィルムを溶着した。
溶着条件は、高周波発振器１０の出力を１２０Ｗ、シール時間を８秒とした。
その結果、プラスチックフィルムの所望の部分を溶着することができた。特に、溶着した部分は、幅が０．８ｃｍ、長さが５ｃｍであったが、その全体で均一に溶着することができた。 A plastic film was welded according to the above-described high frequency dielectric heating welding method.
The welding conditions were such that the output of the high-frequency oscillator 10 was 120 W and the sealing time was 8 seconds.
As a result, a desired portion of the plastic film could be welded. In particular, the welded portion had a width of 0.8 cm and a length of 5 cm, but could be welded uniformly throughout.

以上説明したように、本実施形態の高周波誘電加熱溶着用装置及び高周波誘電加熱溶着方法によれば、第一電極の複数の凸部と第二電極の複数の凸部が正対しない状態で、第一電極と第二電極とを対向配置することで、電極間に挿入された溶着対象物の溶着部分の全体にわたってほぼ均等に電界が発生することから、ムラのない強固な溶着が可能となる。 As described above, according to the high-frequency dielectric heating welding apparatus and the high-frequency dielectric heating welding method of the present embodiment, the plurality of convex portions of the first electrode and the plurality of convex portions of the second electrode do not face each other, By arranging the first electrode and the second electrode so as to face each other, an electric field is generated almost uniformly over the entire welded portion of the object to be welded inserted between the electrodes, so that strong welding without unevenness is possible. .

以上、本発明の高周波誘電加熱溶着用装置及び高周波誘電加熱溶着方法の好ましい実施形態について説明したが、本発明に係る高周波誘電加熱溶着用装置及び高周波誘電加熱溶着方法は上述した実施形態にのみ限定されるものではなく、本発明の範囲で種々の変更実施が可能であることは言うまでもない。
例えば、上述した実施形態では、第一電極に形成された複数の凸部の各稜線部（第二電極に形成された複数の凸部の各稜線部）が平面上で平行に並ぶように形成してあるが、平面上に限るものではなく、曲面上で平行に並ぶように各凸部を形成することもできる。 The preferred embodiments of the high-frequency dielectric heating welding apparatus and the high-frequency dielectric heating welding method of the present invention have been described above, but the high-frequency dielectric heating welding apparatus and the high-frequency dielectric heating welding method according to the present invention are limited only to the above-described embodiments. It goes without saying that various modifications can be made within the scope of the present invention.
For example, in the above-described embodiment, the ridge line portions of the plurality of convex portions formed on the first electrode (the ridge line portions of the plurality of convex portions formed on the second electrode) are formed in parallel on the plane. However, it is not limited to a plane, and each convex portion can be formed so as to be arranged in parallel on a curved surface.

また、第一電極の凹部や第二電極の凹部には、図１３に示すように、絶縁物３９（４９）を埋め込むことができる。これにより、電界の分布を変えることなく、溶着対象物の溶着部分の仕上がりを、平面にしたり緩やかな波形にしたりすることができる。
さらに、溶着対象物が長尺のプラスチックフィルムの場合、図１４に示すように、そのプラスチックフィルムをフィードさせながら、プラスチックフィルムの所望の箇所を溶着していくようにすることもできる。 Further, as shown in FIG. 13, an insulator 39 (49) can be embedded in the concave portion of the first electrode or the concave portion of the second electrode. Thereby, the finish of the welding part of a welding target object can be made into a plane or a gentle waveform, without changing electric field distribution.
Further, when the object to be welded is a long plastic film, as shown in FIG. 14, it is possible to weld a desired portion of the plastic film while feeding the plastic film.

本発明は、高周波誘電加熱溶着装置に用いる電極を発明の対象としていることから、電極を用いて高周波誘電加熱溶着を行なう装置に利用可能である。   The present invention is applicable to an apparatus for performing high-frequency dielectric heating welding using an electrode because an electrode used in the high-frequency dielectric heating welding apparatus is an object of the invention.

１ 高周波誘電加熱溶着装置
１０ 高周波発振器
３０ 第一電極
３１ 底面（対向面）
３２ 凸部
３３ 凹部
３５ 冷却流路
３９ 絶縁物
４０ 第二電極
４１ 上面（対向面）
４２ 凸部
４３ 凹部
４５ 冷却流路
４９ 絶縁物 DESCRIPTION OF SYMBOLS 1 High frequency dielectric heating welding apparatus 10 High frequency oscillator 30 1st electrode 31 Bottom face (opposite surface)
32 Convex part 33 Concave part 35 Cooling flow path 39 Insulator 40 Second electrode 41 Upper surface (opposing surface)
42 Convex part 43 Concave part 45 Cooling flow path 49 Insulator

Claims (8)

角柱形状に形成された第一電極と、角柱形状に形成された第二電極と、前記第一電極及び／又は前記第二電極を所定方向に動かすための押圧用シリンダと、高周波電圧を出力する高周波発振器とを有し、
前記第一電極と前記第二電極が、それぞれ対向する面に複数の凸部を有し、
前記凸部は、直線状の稜線部を有する山形に形成されるとともに、前記稜線部が平行に並ぶように前記対向面上に複数形成されており、
前記第一電極に形成された複数の凸部と前記第二電極に形成された複数の凸部がそれぞれ正対しない状態で、前記第一電極と前記第二電極が配置され、
前記押圧用シリンダを駆動して前記第一電極と前記第二電極を近づける方向に動かして、溶着対象物を前記第一電極と前記第二電極で挟み、前記高周波発振器から出力された高周波電圧を前記第一電極及び前記第二電極に印加し、前記押圧用シリンダを駆動して前記溶着対象物を前記第一電極と前記第二電極で押圧し、所定時間後、前記押圧用シリンダを駆動して、前記第一電極と前記第二電極を前記溶着対象物から離間させることにより、前記溶着対象物を溶着する
ことを特徴とする高周波誘電加熱溶着装置。 A first electrode formed in a prismatic shape, a second electrode formed in a prismatic shape, a pressing cylinder for moving the first electrode and / or the second electrode in a predetermined direction, and a high-frequency voltage are output. A high-frequency oscillator,
The first electrode and the second electrode each have a plurality of convex portions on opposite surfaces,
The convex portion is formed in a mountain shape having a linear ridge line portion, and a plurality of the ridge line portions are formed on the facing surface so that the ridge line portions are arranged in parallel.
In a state where the plurality of protrusions formed on the first electrode and the plurality of protrusions formed on the second electrode do not face each other, the first electrode and the second electrode are arranged,
The pressing cylinder is driven to move the first electrode and the second electrode closer to each other, the object to be welded is sandwiched between the first electrode and the second electrode, and the high-frequency voltage output from the high-frequency oscillator is Applying to the first electrode and the second electrode, driving the pressing cylinder to press the welding object with the first electrode and the second electrode, and driving the pressing cylinder after a predetermined time. Then, the high frequency dielectric heating welding apparatus is characterized in that the welding target is welded by separating the first electrode and the second electrode from the welding target. 前記山形の凸部の先端部が、多角形状、円弧状、楕円形状のいずれかである
ことを特徴とする請求項１記載の高周波誘電加熱溶着装置。 The high-frequency dielectric heating welding apparatus according to claim 1, wherein the tip of the mountain-shaped convex portion is any one of a polygonal shape, an arc shape, and an elliptical shape . 前記凸部が、前記対向面の幅方向又は長手方向に複数並べて形成された
ことを特徴とする請求項１又は２記載の高周波誘電加熱溶着装置。 The high-frequency dielectric heating welding apparatus according to claim 1 or 2 , wherein a plurality of the convex portions are formed side by side in the width direction or the longitudinal direction of the facing surface . 前記複数の凸部の各間を埋める絶縁物を有した
ことを特徴とする請求項１〜３のいずれかに記載の高周波誘電加熱溶着装置。 The high frequency dielectric heating welding apparatus according to any one of claims 1 to 3, further comprising an insulator that fills a space between the plurality of convex portions . 前記第一電極及び／又は第二電極が、冷却媒体を通すための冷却流路を有した
ことを特徴とする請求項１〜４のいずれかに記載の高周波誘電加熱溶着装置。 The high frequency dielectric heating welding apparatus according to any one of claims 1 to 4, wherein the first electrode and / or the second electrode has a cooling flow path for passing a cooling medium . 前記第一電極と第二電極との間に印加させる高周波を出力する高周波発振器を備え、
前記第一電極と第二電極が、溶着対象物を挟みながら、前記高周波の印加を受けて、前記溶着対象物に対し高周波電界を与える
ことを特徴とする請求項１〜５のいずれかに記載の高周波誘電加熱溶着装置。 A high-frequency oscillator that outputs a high frequency applied between the first electrode and the second electrode,
The said 1st electrode and a 2nd electrode receive the application of the said high frequency, pinching | interposing a welding target object, and give a high frequency electric field with respect to the said welding target object. High frequency dielectric heating welding equipment. 角柱形状に形成された第一電極と角柱形状に形成された第二電極とを対向して配置するとともに、前記第一電極の対向面に形成された凸部と前記第二電極の対向面に形成された凸部が、直線状の稜線部を有する山形に形成されるとともに、前記稜線部が平行に並ぶように前記対向面上に複数形成されており、前記第一電極の対向面に形成された複数の凸部と前記第二電極の対向面に形成された複数の凸部がそれぞれ正対しない状態で、前記第一電極と前記第二電極とを配置し、The first electrode formed in a prismatic shape and the second electrode formed in a prismatic shape are arranged to face each other, and the convex portion formed on the facing surface of the first electrode and the facing surface of the second electrode The formed convex portions are formed in a mountain shape having a straight ridge line portion, and a plurality of the ridge line portions are formed on the facing surface so as to be arranged in parallel, and are formed on the facing surface of the first electrode. In a state where the plurality of convex portions and the plurality of convex portions formed on the opposing surface of the second electrode do not face each other, the first electrode and the second electrode are arranged,
前記第一電極と前記第二電極との間に溶着対象物を挿入し、Insert a welding object between the first electrode and the second electrode,
挿入された前記溶着対象物を前記第一電極と前記第二電極で挟み、The inserted welding object is sandwiched between the first electrode and the second electrode,
前記第一電極及び前記第二電極に高周波電力を印加し、Applying high frequency power to the first electrode and the second electrode;
前記溶着対象物を前記第一電極と前記第二電極で押圧し、Press the welding object with the first electrode and the second electrode,
所定時間後、前記第一電極と前記第二電極を前記溶着対象物から離間させることにより、前記溶着対象物を溶着するAfter the predetermined time, the welding object is welded by separating the first electrode and the second electrode from the welding object.
ことを特徴とする高周波誘電加熱溶着方法。A high frequency dielectric heating welding method characterized by the above. 前記溶着対象物が、ポリアミド系及び／又はＰＥＴフィルムを含むプラスチックフィルムからなり、The welding object consists of a plastic film including a polyamide system and / or a PET film,
このプラスチックフィルムの接着面が、ポリオレフィン系フィルムからなるThe adhesive surface of this plastic film is made of a polyolefin film.
ことを特徴とする請求項７記載の高周波誘電加熱溶着方法。The high-frequency dielectric heating welding method according to claim 7.
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