JPS63288738A - 高周波溶着方法 - Google Patents

高周波溶着方法

Info

Publication number
JPS63288738A
JPS63288738A JP62124671A JP12467187A JPS63288738A JP S63288738 A JPS63288738 A JP S63288738A JP 62124671 A JP62124671 A JP 62124671A JP 12467187 A JP12467187 A JP 12467187A JP S63288738 A JPS63288738 A JP S63288738A
Authority
JP
Japan
Prior art keywords
thermoplastic resin
frequency
temp
electrodes
welding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP62124671A
Other languages
English (en)
Inventor
Seiji Kagawa
清二 加川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tonen Chemical Corp
Original Assignee
Tonen Sekiyu Kagaku KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tonen Sekiyu Kagaku KK filed Critical Tonen Sekiyu Kagaku KK
Priority to JP62124671A priority Critical patent/JPS63288738A/ja
Publication of JPS63288738A publication Critical patent/JPS63288738A/ja
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/04—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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/72—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by combined operations or combined techniques, e.g. welding and stitching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • 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
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • 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
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
    • 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
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • B29C66/91413—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account the parts to be joined having different temperatures
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91655—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the current intensity
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B29C66/9192—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B29C66/9192—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams
    • B29C66/91921—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature
    • B29C66/91931—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of one of the parts to be joined
    • B29C66/91935—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of one of the parts to be joined lower than said fusion temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7314—Electrical and dielectric properties
    • B29C66/73143—Dielectric properties
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • B29C66/91423—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools using joining tools having different temperature zones or using several joining tools with different temperatures
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/959—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables
    • B29C66/9592—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables in explicit relation to another variable, e.g. X-Y diagrams

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は熱可塑性樹脂成形体の溶着方法に関し、特に誘
電損の小さい熱可塑性樹脂の成形体を高周波溶着する方
法に関する。
〔従来の技術〕
ポリエチレン、ポリプロピレン、ポリエステルなどの熱
可塑性樹脂の成形体やフィルムを用いてカップや袋等を
製造する場合、成形体やフィルム等の溶着方法としては
発熱体を用いる熱溶着が最ヒートシールは困難であり、
特に厚肉成形体やフィルムにおいて加熱時間が長いなど
、生産性に劣るという欠点があった。
そこで、発熱体を用いる熱溶着方法に代わる方法として
高周波により熱可塑性樹脂の成形体やフィルム自体を発
熱せさる内部発熱方式が近時行われるようになった。こ
の内部発熱方式による溶着は、熱溶着すべき部分を効率
よく発熱させることができるため、均一な溶着が可能で
あり、しかも溶着部分のシール強度が大きいという特色
があるしかし、ポリエチレン、ポリプロピレン、ポリエ
ステルなどの非極性熱可塑性樹脂は電気的内部発熱が十
分でないため、通常の方法では内部発熱方式による溶着
を適用することができない。
このため非極性熱可塑性樹脂成形体に誘電損の大きな極
性熱可塑性樹脂成形体を被覆し、高周波加熱することに
より溶着する方法が提案された（特開昭５１−１１９７
７１号、同５５−５９９２１　号、同５５−１３３９２
０号、同５５−１５０３２１号）。また、極性熱可塑性
樹脂成形体を被覆する代わりに、溶着部外面に極性物質
を塗布し、高周波溶着する方法も提案された（特開昭５
８−２１７３１９号）。さらに熱可塑性樹脂に高周波エ
ネルギー吸収物質を分散した非導電性体の高周波による
接着方法であって、極性基を有する樹脂で高周波エネル
ギー吸収物質を予め表面処理してから非磁性熱可塑性物
質に分散することを特徴とする方法も提案された（特開
昭６１−１５８４２７号）。
〔発明が解決しようとする問題点〕
しかしながら、非極性熱可塑性樹脂成形体に誘電損の大
きな極性熱可塑性樹脂成形体を被覆して高周波溶着する
方法では、誘電損の大きな極性熱可塑性樹脂成形体を被
覆する工程を要するために全体として溶着工程が煩雑と
なる。同様に溶着部外面に極性物質を塗布して高周波溶
着する方法も、塗布工程があるために全体として溶着工
程が煩雑となり、溶着コストが高くなる。さらに予め表
面処理した高周波エネルギー吸収物質を分散する方法も
煩雑である他に、被溶着成形体の物性が低下するという
問題がある。その上これらの従来技術の方法ではシール
の剥離強度を調節することが必ずしも容易ではない。
従って、本発明の目的は高周波により加熱し得る極性熱
可塑性樹脂を被覆あるいは塗布したり、高周波エネルギ
ー吸収物質を分散したりすることなく、誘電損の小さい
熱可塑性樹脂の成形体を直接高周波溶着する方法を提供
することである。
さらに本発明の目的は、所望の剥離強度を得るように調
節するのが容易な高周波溶着方法を提供することである
。
〔問題点を解決するための手段〕
上記目的に鑑み鋭意研究の結果、本発明者は高周波用電
極を加熱することにより誘電損の小さい熱可塑性樹脂の
成形体でも高周波溶着をすることができ、かつ加熱温度
を調節することにより容易に剥離強度を調節することが
できることを発見し、本発明に想到した。
すなわち、誘電損の小さい熱可塑性樹脂成形体を高周波
溶着する本発明の方法は、一対の電極間に前記熱可塑性
樹脂成形体をはさみ、かつ前記電極の温度を４０℃乃至
前記熱可塑性樹脂の融点より２０℃小さい温度の範囲内
で調節し、もって前記成形体の剥離強度を調節すること
を特徴とする本発明の高周波溶着方法により誘電損の小
さい熱可塑性樹脂を溶着することができる。誘電体に高
周波の電界を印加すると、誘電分子が電界の作用で運動
し摩擦抵抗に似た分子間結合力の抵抗に依って誘電損が
生じ発熱する。従って、誘電損の小さい樹脂程高周波に
よる発熱が小さい。誘電損が小さい熱可塑性樹脂は一般
的に非極性の熱可塑性樹脂であり、例えばポリエチレン
やポリプロピレン等のポリオレフィン、ポリエチレンテ
レフタレート等のポリエステル、フッ素系樹脂、ポリカ
ーボネート、ポリスチレン等である。誘電損の小さな熱
可塑性樹脂の成形体はシート状、フィルム状又は容器状
等いずれの形態でもよくその溶着部は通常の高周波溶着
に適する厚さであればいかなる厚さでもよい。
上記誘電損の小さな熱可塑性樹脂の溶着に用い高周波は
、４０．４６〜４１．１４　ＭＨｚ程度の周波数で２．
０〜５．ＯＫＷ程度の出力のものである。高周波用電極
の剥離強度のレベル、電極の加熱温度及び溶着する物質
の重量の多少により異なるが、一般的に２〜１０秒間程
度である。
高周波用電極の加熱は誘電損の小さな熱可塑性樹脂の溶
着を可能にするために必要である。加熱温度は溶着する
熱可塑性樹脂の種類、成形体の厚さ、高周波の出力及び
照射時間、及び所望の剥離強度の大きさ等により異なる
が、一般的には４０〜１５０℃の範囲内である。加熱温
度の上限は熱可塑性樹脂の融点より２０℃以上低い温度
であり、それより高くなると剥離強度の調節が困難とな
る。一方下限は４０℃で、それより小さいと高周波溶着
ができない。具体的にはポリエチレンの場合、加熱温度
は４０〜９０℃の範囲であり、ポリプロピレンの場合５
０〜９５℃の範囲であり、ポリエステルの場合９０〜１
５０の範囲である。
熱可塑性樹脂成形体の高周波溶着は一対の電極間にはさ
んで行うが、この際成形体が相互にある程度の圧力で密
着していればよく、特に圧着する必要はない。
〔作用〕
誘電損の小さな熱可塑性樹脂の成形体の高周波溶着が電
極の加熱により可能となる理由は必ずしも明らかでない
が、高周波の出力を一定にして電極温度を上げると、電
子放射量（電流）が増大し、分子摩擦熱による内部発熱
が増加するとともに、電極からの熱伝導も加わるためで
あると考えられる。電極温度を低下させると、内部発熱
量が低下し、その結果剥離（接着）強度も低下する。こ
のため電極温度を適当に調節することにより、剥離強度
を任意に調節することができる。
〔実施例〕
本発明を添付図面を参照して、詳細に説明する第１図は
本発明の高周波溶着方法を実施するための装置の一例を
示す概略図である。溶着装置１は上部電極２と下部電極
３とを有し、上部電極２と下部電極３との間に高周波溶
着すべき熱可塑性樹脂成形体く本実施例ではカップ）４
の被溶着部５が挟まれる。上部電極２及び下部電極３は
それぞれ発振器６と接続しており、発振器６はチョーク
コイル７を介して高圧電源８に接続している。
第２図は溶着装置１の上部電極２の要部を示す断面図で
ある。上部電極２は第一接着面１１と第二接着面１２と
を有し、第一接着面１１と第二接着面１２との間に絶縁
筒１３が設けられている。
第一接着面１１用の電極１４と第二接着面１２用の電極
１５とは上端部において接触している。上部電極２の本
体には電極加熱用コイル１６．１７が設けられており、
コイル１６．１７の上方には冷却孔１８が設けられてお
り、下方には冷却用フィ　ン　１９が設けられている。
第３図はカップ４の溶着部を概略的に示す図である。溶
着部は第一溶着部３１と第二溶着部３２とからなり、そ
の間には絶縁筒１３による非溶着部３３がある。
以上のような構成の電極を用い、高周波溶着する場合、
まず上部電極２と下部電極３との間に二枚の溶着すべき
熱可塑性樹脂成形体をはさみ、十分に密着させる。それ
と同時に高周波を所望時間照射することにより溶着を行
う。第一接着面１１と第二接着面１２の温度が異なるよ
うに加熱用コイル１６．１７に流す電流を調節すること
ができる。それにより第一溶着部３１及び第二溶着部３
２の剥離強度を異なるものとすることができる。
例えば外側の第二溶着部３２の剥離強度を小さくし、内
側の第一溶着部３１の剥離強度を大きくすることにより
、十分に密封されているとともに剥離が比較的容易なシ
ールとすることができる。
本発明を以下の実施例によりさらに詳細に説明する。
実施例１ 低密度ポリエチレン（比重：０．９２）融点＝１１０℃
）のフィルム（厚さ２００μｍ）を一対の電極間にはさ
み、高周波溶着を行った。照射した高周波の出力は３，
２ＫＷ、周波数は４１ＭＨｚ、照射時間は４．０秒であ
った。このような条件下で電極の加熱温度を６０〜９０
℃に変化させ、各温度における溶着部について剥離強度
を測定した。結果を第４図に示す。
第４図から明らかなように、電極の温度が上昇するに比
例して溶着部の剥離強度は上昇した。温度が９０℃を超
えると完全に溶着した。これにより、電極温度を適当に
設定することにより所望の剥離強度にポリエチレンフィ
ルムを高周波溶着することができることがわかる。
実施例２ 厚さ２５μｍのポリプロピレン（融点：１７０　℃）の
フィルムを一対の電極間にはさみ、高周波溶着を行った
。照射した高周波の出力は２．５ＫＷ、周波数は４１Ｍ
Ｈｚ、照射時間は４．０秒であった。このような条件下
で電極の加熱温度を５５℃〜６４℃に変化させ、各温度
における溶着部の剥離強度を測定した。結果を第５図に
示す。
第５図から明らかなように、電極の温度が上昇するにほ
ぼ比例して溶着部の剥離強度は上昇した。これにより、
電極温度を適当に設定することにより所望の剥離強度に
ポリプロピレンを高周波溶着することができることがわ
かる。
実施例３ 厚さ１０μｍのポリエチレンテレフタレート　（融点：
２６４　℃）のフィルムを一対の電極間にはさみ、高周
波溶着を行った。照射した高周波の出力は３．５　ＫＷ
、周波数は４１ＭＨｚ、照射時間は４秒であった。この
ような条件下で電極の加熱温度を８５℃〜１１０℃に変
化させ、１１０℃における溶着部の剥離強度を測定した
結果は１．５　Ｋｇ／ｃｍであった。
これにより、電極温度を適当に設定することにより所望
の剥離強度にポリエステルを高周波溶着することができ
ることがわかる。
実施例４ 第１図及び第２図に示す装置を用いて、ポリプロピレン
製カップ（融点＝１７０　℃）に厚さ５０μｍのポリプ
ロピレンフィルム（融点＋１７０　℃）を高周波溶着し
た。照射した高周波の出力は２．５ＫＷ１周波数は４１
ＭＨｚ、照射時間は４．０秒であった。また第一接着面
１１の温度は７０℃とし、第二接着面１２の温度を６０
℃とした。その結果、第一溶着部３１及び第二溶着部３
２の剥離強度はそれぞれ１．６　Ｋｇ／ｃｍ及び０．８
　Ｋｇ／ｃｍであった。この剥離強度はカップをレトル
ト食品用容器として使用するのに十分であり、かつ外側
の第二溶着部３２の剥離強度が相対的に小さいので、蓋
の剥離が容易である。
〔発明の効果〕
以上に詳述した通り、本発明の方法により、極性熱可塑
性樹脂の被覆、塗布又は分散をすることなく、ポリエチ
レン、ポリプロピレン、ポリエステル等の誘電損の小さ
い熱可塑性樹脂のフィルム、シート、容器等のパッケー
ジシールを行うこときる。　また電極の加熱温度を調節
することにより所望の剥離強度を得ることができる。こ
のため用途に応じた剥離強度を必要とするイージーピー
ル等　に有効である。
【図面の簡単な説明】
第１図は本発明の方法を実施するための装置の一例を示
す概略図であり、 第２図は第１図の装置の要部を示す断面図であり、 第３図は溶着用カップ及びその溶°着部を示す図であり
、 第４図は低密度ポリエチレンフィルムについて電極温度
と剥離強度との関係を示すグラフであり、　第５図はポ
リプロピレンフィルムについて電極温度と剥離強度との
関係を示すグラフである。

Claims (2)

    【特許請求の範囲】
  1. （１）誘電損の小さい熱可塑性樹脂成形体を高周波によ
    り溶着する方法において、一対の電極間に前記熱可塑性
    樹脂成形体をはさみ、かつ前記電極の温度を４０℃乃至
    前記熱可塑性樹脂の融点より２０℃以上低い温度の範囲
    内で調節し、もって前記成形体の剥離強度を調節するこ
    とを特徴とする方法。
  2. （２）特許請求の範囲第１項に記載の方法において、前
    記熱可塑性樹脂がポリオレフィンであることを特徴とす
    る方法。
JP62124671A 1987-05-20 1987-05-20 高周波溶着方法 Pending JPS63288738A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62124671A JPS63288738A (ja) 1987-05-20 1987-05-20 高周波溶着方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62124671A JPS63288738A (ja) 1987-05-20 1987-05-20 高周波溶着方法

Publications (1)

Publication Number Publication Date
JPS63288738A true JPS63288738A (ja) 1988-11-25

Family

ID=14891177

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62124671A Pending JPS63288738A (ja) 1987-05-20 1987-05-20 高周波溶着方法

Country Status (1)

Country Link
JP (1) JPS63288738A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0852802A (ja) * 1994-08-12 1996-02-27 Piaresu:Kk 高周波誘電加熱によるプラスチックの接着法
EP0945247A3 (en) * 1998-03-25 2001-04-11 Idemitsu Petrochemical Co., Ltd. Sealing of polyolefin-based resin, and sealed article of the resin

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0852802A (ja) * 1994-08-12 1996-02-27 Piaresu:Kk 高周波誘電加熱によるプラスチックの接着法
EP0945247A3 (en) * 1998-03-25 2001-04-11 Idemitsu Petrochemical Co., Ltd. Sealing of polyolefin-based resin, and sealed article of the resin

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