JPH0977006A - 容器に対する蓋の高周波加熱シール装置 - Google Patents

容器に対する蓋の高周波加熱シール装置

Info

Publication number
JPH0977006A
JPH0977006A JP23238295A JP23238295A JPH0977006A JP H0977006 A JPH0977006 A JP H0977006A JP 23238295 A JP23238295 A JP 23238295A JP 23238295 A JP23238295 A JP 23238295A JP H0977006 A JPH0977006 A JP H0977006A
Authority
JP
Japan
Prior art keywords
lid
container
heat
elastic body
resistant elastic
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.)
Granted
Application number
JP23238295A
Other languages
English (en)
Other versions
JP3572429B2 (ja
Inventor
Yoshifumi Miki
芳文 三木
Giichi Yasuda
義一 安田
Yutaka Aoyama
豊 青山
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.)
Shikoku Kakoki Co Ltd
SPC Electronics Corp
Showa Aluminum Can Corp
Original Assignee
Shikoku Kakoki Co Ltd
SPC Electronics Corp
Showa Aluminum Corp
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 Shikoku Kakoki Co Ltd, SPC Electronics Corp, Showa Aluminum Corp filed Critical Shikoku Kakoki Co Ltd
Priority to JP23238295A priority Critical patent/JP3572429B2/ja
Publication of JPH0977006A publication Critical patent/JPH0977006A/ja
Application granted granted Critical
Publication of JP3572429B2 publication Critical patent/JP3572429B2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General 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
    • B29C66/72General 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 structure of the material of the parts to be joined
    • B29C66/723General 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 structure of the material of the parts to be joined being multi-layered
    • B29C66/7232General 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 structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72321General 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 structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of metals or their alloys
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3656Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a layer of a multilayer part to be joined, e.g. for joining plastic-metal laminates
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3668Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special induction coils
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3672Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3676Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic
    • B29C65/368Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic with a polymer coating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint 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
    • B29C66/112Single lapped joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13Single 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
    • B29C66/131Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/20Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242Particular 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
    • B29C66/2422Particular 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
    • B29C66/24221Particular 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/50General 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
    • B29C66/51Joining 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
    • B29C66/53Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General 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
    • B29C66/73General 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
    • B29C66/735General 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 extensive physical properties of the parts to be joined
    • B29C66/7352Thickness, e.g. very thin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General 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
    • B29C66/74Joining plastics material to non-plastics material
    • B29C66/746Joining plastics material to non-plastics material to inorganic materials not provided for in groups B29C66/742 - B29C66/744
    • B29C66/7465Glass
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/81General 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
    • B29C66/814General 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
    • B29C66/8145General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81457General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a block or layer of deformable material, e.g. sponge, foam, rubber
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/81General 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
    • B29C66/818General 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
    • B29C66/8181General 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
    • B29C66/81811General 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/81General 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
    • B29C66/812General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/83General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832Reciprocating joining or pressing tools
    • B29C66/8322Joining or pressing tools reciprocating along one axis
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B29K2705/02Aluminium

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Closing Of Containers (AREA)

Abstract

(57)【要約】 【課題】 開封用つまみ部付き蓋をシールする場合等
に、十分なシール強度が得られ、かつつまみ部に焦げが
発生することがなく、しかも、シール面が平坦でない容
器に対しても十分なシール性が得られるヒートシール装
置を提供する。 【解決手段】 蓋7を容器口縁部9に押圧する耐熱弾性
体6はリング状で、その内径が容器8口径にほぼ等し
い。磁束を集中させて加熱効果を増加させる磁性体4は
リング状で、耐熱弾性体6の内側にこれと間隙をおいて
かつ底面同士が同レベルとなるように配置されている。
蓋7の容器口縁部対応部分を加熱するリング状の誘導加
熱用コイル3が、磁性体4と耐熱弾性体6との間隙を埋
めかつその底面が磁性体4および耐熱弾性体6の各底面
とほぼ面一である環状下方突出部3cを有している。

Description

【発明の詳細な説明】
【0001】
【発明の属する技術分野】この発明は、金属箔層を含ん
だ蓋をガラス容器等に高周波加熱シールするのに使用さ
れる、容器に対する蓋の高周波加熱シール装置に関す
る。
【0002】
【従来の技術】蓋の容器口縁部対応部分を加熱するリン
グ状の誘導加熱用コイルと、蓋を容器口縁部に押圧する
耐熱弾性体とを備え、誘導加熱用コイルに高周波電流を
流して蓋の容器口縁部対応部分を誘導加熱するととも
に、耐熱弾性体により蓋を容器口縁部に押圧することに
より、容器に蓋を高周波加熱シールする装置は、従来よ
り知られている(特公昭47−50156号公報参
照)。
【0003】また、誘導加熱用コイルに接して磁束集中
用磁性体を配置し、加熱効果を増加させることも知られ
ている(実公昭60−13767号公報参照)。
【0004】
【発明が解決しようとする課題】上記従来の容器に対す
る蓋の高周波加熱シール装置により、ガラス容器のよう
にシール面が平坦でないものに蓋をシールする場合、耐
熱弾性体の厚みが薄いと、加圧時に容器と蓋を密着させ
る効果が乏しくかつ耐久性にも欠けるため、耐熱弾性体
の厚みは2〜3ミリ必要となる。
【0005】ところが、耐熱弾性体の厚みを2〜3ミリ
と厚くとすると、誘導加熱用コイルと蓋の距離が離れる
ために、蓋の加熱すべき部分における磁界の集中性が弱
まって、必要な加熱効果が得られなくなってしまう。し
たがって、容器の口径より大きい蓋をシールする場合
や、開封用つまみ部付き蓋をシールする場合には、蓋の
外周縁部に沿って発熱が起こるため、シール部が十分加
熱されずにシール強度不足になったり、また、十分なシ
ール強度を得るべく強く加熱すると熱量過多となり、蓋
の外周縁部や開封用つまみ部に焦げが発生するという問
題があった。
【0006】この発明の目的は、容器の口径より大きい
蓋をシールする場合や、開封用つまみ部付き蓋をシール
する場合であっても、十分なシール強度が得られ、かつ
蓋の外周縁部や開封用つまみ部に焦げが発生することが
なく、しかも、耐熱弾性体の厚みを厚くできるため、ガ
ラス容器のようにシール面が平坦でないものに対しても
十分なシール性が得られる容器に対する蓋のヒートシー
ル装置を提供することにある。
【0007】
【課題を解決するための手段】この発明による容器に対
する蓋の高周波加熱シール装置は、蓋の容器口縁部対応
部分を加熱するリング状の誘導加熱用コイルと、蓋を容
器口縁部に押圧する耐熱弾性体と、磁束を集中させて加
熱効果を増加させる磁性体とを備えている、容器に対す
る蓋の高周波加熱シール装置において、耐熱弾性体はリ
ング状で、その内径が容器口径にほぼ等しく、磁性体は
リング状または円盤状で、耐熱弾性体の内側にこれと間
隙をおいてかつ底面同士が同レベルとなるように配置さ
れ、コイルが、磁性体と耐熱弾性体との間隙を埋めかつ
その底面が磁性体および耐熱弾性体の各底面とほぼ面一
である環状下方突出部を有していることを特徴とするも
のである。
【0008】この発明の容器に対する蓋の高周波加熱シ
ール装置によると、誘導加熱用コイルに高周波電流を流
したさいに生じる磁束は、磁束集中用磁性体により集め
られ、蓋の容器口径のすぐ内側に対応する部分が強く加
熱される。この熱が蓋の容器口縁部対応部分すなわち蓋
のシールされるべき部分に伝わり、蓋の容器口縁部対応
部分が耐熱弾性体に押圧されることにより、蓋が均一に
ヒートシールされる。
【0009】上記の加熱作用は、耐熱弾性体によって
は、弱められることはなく、耐熱弾性体の厚みを厚くし
ても、加熱性能が低下することがない。
【0010】
【発明の実施の形態】この発明の実施の形態を、以下図
面を参照して説明する。
【0011】図1に示す容器に対する蓋の高周波加熱シ
ール装置は、金属箔層を含んだ蓋(7) をガラス容器口縁
部(9) に加熱シールするもので、蓋(7) の容器口縁部対
応部分を加熱するリング状の誘導加熱用2次コイル(3)
、蓋(7) を容器口縁部(9) に押圧する耐熱弾性体(6)
、磁束を集中させて加熱効果を増加させる磁性体(4)
を備えたシールブースタ(1) と、2次コイル(3) と磁気
結合するようにシールブースタ(1) の上方に配置された
1次コイル(2) とを備えている。2次コイル(3) は、1
ターンコイルを形成するためのスリットを有している。
1次コイル(2) はプラスチック等の絶縁物に内蔵され
て、シールブースタ(1) 上方で固定されており、シール
ブースタ(1) は1次コイル(2) に固定されている。
【0012】耐熱弾性体(6) は、シリコンゴム製で厚さ
が3mmの断面形状が方形のリング状であり、その内径
は容器(8) の口径に等しく、その外径は容器口縁部(9)
の外径よりも大きくなされている。
【0013】磁性体(4) は、フェライト製で断面形状が
方形のリング状であり、耐熱弾性体(6) の内側に間隙を
おいて配置されている。磁性体(4) の底面は耐熱弾性体
(6)の底面と同レベルで、その厚さは耐熱弾性体(6) よ
りも厚くなされている。
【0014】2次コイル(3) は、耐熱弾性体(6) の外側
にあって上面が1次コイル(2) 近くに位置しかつ底面が
耐熱弾性体(6) の底面と同レベルである垂直部(3a)と、
耐熱弾性体(6) の上側にあって内周面が磁性体(4) の外
周面に接する水平部(3b)と、水平部(3b)内周縁部より下
方に突出し磁性体(4) と耐熱弾性体(6) との間隙を埋め
かつその底面が磁性体(4) および耐熱弾性体(6) の各底
面と面一である環状下方突出部(3c)とよりなる。下方突
出部(3c)の肉厚Tは、厚すぎるとシールに不要な蓋(7)
の内側を余分に加熱することになる。下方突出部(3c)の
肉厚Tは、容器と蓋(7) の材質構成および寸法・形状等
により決定すべきものであり、0.5mm〜2ミリの範
囲が妥当である。垂直部(3a)外側には水冷用パイプ(5)
が接合されている。
【0015】この発明による上記高周波加熱シール装置
によりガラス容器(8) の口縁部(9)に金属箔層を含んだ
蓋(7) を高周波加熱シールするには、次のようにして行
う。
【0016】蓋(7) は、図2および図3に示すように、
上面が耐熱製樹脂(11)でコーティングされたアルミニウ
ム箔層(12)と、これの底面に接着剤層(13)を介して設け
られた高周波加熱シール材層(14)とによって構成されて
おり、開封用つまみ部(7a)が設けられている。
【0017】まず、シールブースタ(1) の下方に設けら
れた昇降装置(図示略)の台座上の所定位置に、ガラス
容器(8) を載せ、この容器(8) に蓋(7) を被せる。つい
で昇降装置の台座を上昇させ、容器(8) に被せられた蓋
(7) をシールブースタ(1) に押し付ける。ここで、1次
コイル(2) に高周波電流を例えば1秒間流す。すると、
2次コイル(3) に誘導電流が流れ、2次コイル(3) 内に
磁界が発生する。この磁束は、2次コイル(3) 内側に配
置された磁性体(4) により集められ、容器(8)の口径よ
り内側部分に対応する蓋(7) の部分に均一な渦電流を集
中的に発生させる。これにより容器(8) の口径より内側
部分に対応する蓋(7) の部分が加熱され、この熱がさら
に蓋(7) の容器口縁部対応部分の高周波加熱シールされ
るべき部分に伝わり、蓋(7) が容器(8) にシールされ
る。冷却時間として例えば0.5秒間とって冷却し、加
圧を解放してシールは完了する。
【0018】シリコンゴムよりなる耐熱弾性体(6) はそ
の弾性により十分に変形可能であるため、蓋(7) の高周
波加熱シール材層(14)が耐熱弾性体(6) により押圧され
て、蓋(7) が容器口縁部(9) に確実にシールされる。
【0019】比較のため、本発明の実施例と、磁性体が
使用されていない従来のものとについて、シール強度を
比較した結果を表1に示す。この評価で使用された蓋
(7) は、上面が耐熱製樹脂(11)でコーティングされた5
0μmのアルミニウム箔層(12)と、これの底面に接着剤
層(13)を介して設けられた50μmの高周波加熱シール
材層(14)とによって構成されており、直径が56mmで
かつ5mmの開封用つまみ部(7a)が設けられている。ガ
ラス容器(8) の外径は52mmである。シール強度は、
図3に鎖線で示す箇所、すなわち、つまみ部(7a)と、つ
まみ部から90度、180度および270度離れた非つ
まみ部とにおいて、蓋(7) を15mm幅にカットし、9
0度方向に引張り測定した。表1には10回測定した結
果の平均値を示す。
【0020】
【表1】 表1からわかるように、本発明の実施例のものは従来の
ものに比べて、シール強度が大きくなっているが、この
差は開封用つまみ部(7a)において特に大きい。また、実
施例のものは、測定箇所の違いによるばらつきが非常に
小さくなっている。また、2次コイル(3) のスリット
は、スリット部において磁力線がゼロとなり、シール性
に悪影響を与えるものであるが、上記結果より、本発明
の実施例のものは、スリットの悪影響を受けることなく
蓋(7) を容器口縁部(9) に確実にシールできることも分
かる。
【0021】上記において、磁性体(4) としてフェライ
トが使用されているが、フェライト以外でも、磁気抵抗
の低い、したがって透磁率の高いものであればよく、ニ
ッケル、コバルト等の金属の磁性体も使用できる。ま
た、磁性体(4) の形状はリング状に限らず円盤状であっ
てもよい。2次コイル(3) および磁性体(4) の大きさに
ついては、蓋(7) および容器(8) の形状や材質などを考
慮して決定される。2次コイル(3) には、銅、アルミニ
ウム、真鍮などの固有抵抗の小さい金属が使用される。
【0022】また、耐熱弾性体(6) は、シリコーンラバ
ー以外の耐熱合成ゴムやポリイミドフィルム等の耐熱合
成樹脂フィルムであってもよい。耐熱弾性体(6) の厚み
は、1.0mm以上で3.0mm以下が好ましい。耐熱
弾性体(6) の厚みが薄すぎると、容器口縁部(9) の凹凸
が大きい場合にその凹凸を吸収するのが難しい。
【0023】蓋(7) を構成する金属箔層は、アルミニウ
ム箔層(12)以外の金属箔層であってもよい。アルミニウ
ム箔の場合は、その厚さは6〜100μm、好ましくは
20〜50μmである。
【0024】また上記実施例においては、ガラス容器
(8) の高周波加熱シールについて説明したが、この発明
の装置は、その他例えば合成樹脂製容器等の容器にも適
用可能である。
【0025】なお、上記実施例ではシールブースタ(1)
は1次コイル(2) に固定されているが、シールブースタ
(1) を回転自在のロータリー加圧板の回転軸を中心とす
る同一円周上に等間隔をおいてあけられた複数の孔に組
込み、シールブースタ(1) が1次コイル(2) に対して移
動できるようにしてもよい。シールブースタ(1) をロー
タリー加圧板に組み込むことにより、高速で安定確実な
自動シール装置を実現することができる。
【0026】
【発明の効果】この発明の容器に対する蓋の高周波加熱
シール装置によると、誘導加熱用コイルに高周波電流を
流したさいに生じる磁束は、磁束集中用磁性体により集
められ、蓋の容器口径のすぐ内側に対応する部分が強く
加熱される。この熱が蓋の容器口縁部対応部分すなわち
蓋のシールされるべき部分に伝わり、蓋の容器口縁部対
応部分が耐熱弾性体に押圧されることにより、蓋が均一
にヒートシールされるので、容器の口径より大きい蓋を
シールする場合や、開封用つまみ部付き蓋をシールする
場合であっても、十分なシール強度が得られ、かつ蓋の
外周縁部や開封用つまみ部に焦げが発生することがな
い。
【0027】また、耐熱弾性体の厚みを厚くしても、加
熱性能が低下することがないので、耐熱弾性体を厚くす
ることができ、高周波加熱シールのさいに容器口縁部の
凹凸を吸収することが容易となる。
【図面の簡単な説明】
【図1】この発明による容器に対する蓋の高周波加熱シ
ール装置の実施例を示す断面図である。
【図2】蓋の部分拡大断面図である。
【図3】容器の斜視図である。
【符号の説明】
(3) 2次コイル(誘導加熱用コイル) (3c) 下方突出部 (4) 磁性体 (6) 耐熱弾性体 (7) 蓋 (8) 容器
フロントページの続き (72)発明者 三木 芳文 徳島県板野郡北島町太郎八須字西の川10番 地の1 四国化工機株式会社内 (72)発明者 安田 義一 堺市海山町6丁224番地 昭和アルミニウ ム株式会社内 (72)発明者 青山 豊 東京都町田市野津田町1795番地41

Claims (1)

    【特許請求の範囲】
  1. 【請求項1】 蓋(7) の容器口縁部対応部分を加熱する
    リング状の誘導加熱用コイル(3) と、蓋(7) を容器口縁
    部(9) に押圧する耐熱弾性体(6) と、磁束を集中させて
    加熱効果を増加させる磁性体(4) とを備えている、容器
    に対する蓋の高周波加熱シール装置において、耐熱弾性
    体(6) はリング状で、その内径が容器(8) 口径にほぼ等
    しく、磁性体(4) はリング状または円盤状で、耐熱弾性
    体(6)の内側にこれと間隙をおいてかつ底面同士が同レ
    ベルとなるように配置され、コイル(3) が、磁性体(4)
    と耐熱弾性体(6) との間隙を埋めかつその底面が磁性体
    (4) および耐熱弾性体(6) の各底面とほぼ面一である環
    状下方突出部(3c)を有していることを特徴とする、容器
    に対する蓋の高周波加熱シール装置。
JP23238295A 1995-09-11 1995-09-11 容器に対する蓋の高周波加熱シール装置 Expired - Lifetime JP3572429B2 (ja)

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KR100872195B1 (ko) * 2007-02-27 2008-12-09 주식회사위너테크 용기의 실링 장치
JP2013066916A (ja) * 2011-09-22 2013-04-18 Toyo Seikan Kaisha Ltd ヒートシール缶及びその製造方法
JP2018536595A (ja) * 2015-11-27 2018-12-13 テトラ ラバル ホールディングス アンド ファイナンス エス エイ 射出成形された磁場コンセントレータを備えたシーリング装置
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US11370571B2 (en) 2017-07-18 2022-06-28 Tetra Laval Holdings & Finance S.A. Induction sealing device
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US11548238B2 (en) 2018-09-10 2023-01-10 Tetra Laval Holdings & Finance S.A. Method for forming a tube and a method and a packaging machine for forming a package
US11554555B2 (en) 2017-05-30 2023-01-17 Tetra Laval Holdings & Finance S.A. Apparatus for sealing the top of a package for a food product and system for forming and filling a food package
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KR100867218B1 (ko) * 2007-02-27 2008-11-06 주식회사위너테크 용기의 실링 장치
KR100872195B1 (ko) * 2007-02-27 2008-12-09 주식회사위너테크 용기의 실링 장치
JP2013066916A (ja) * 2011-09-22 2013-04-18 Toyo Seikan Kaisha Ltd ヒートシール缶及びその製造方法
JP2018536595A (ja) * 2015-11-27 2018-12-13 テトラ ラバル ホールディングス アンド ファイナンス エス エイ 射出成形された磁場コンセントレータを備えたシーリング装置
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US10994495B2 (en) 2015-11-27 2021-05-04 Tetra Laval Holdings & Finance S.A. Sealing device with increased robustness
US11534985B2 (en) 2016-05-02 2022-12-27 Tetra Laval Holdings & Finance S.A. Induction sealing system
US11554555B2 (en) 2017-05-30 2023-01-17 Tetra Laval Holdings & Finance S.A. Apparatus for sealing the top of a package for a food product and system for forming and filling a food package
US10899082B2 (en) 2017-07-17 2021-01-26 Tetra Laval Holdings & Finance S.A. Inductor coil for induction welding of a packaging material
US11370571B2 (en) 2017-07-18 2022-06-28 Tetra Laval Holdings & Finance S.A. Induction sealing device
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