JP2004066520A - Method and apparatus for melting by heating bung - Google Patents

Method and apparatus for melting by heating bung Download PDF

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Publication number
JP2004066520A
JP2004066520A JP2002225884A JP2002225884A JP2004066520A JP 2004066520 A JP2004066520 A JP 2004066520A JP 2002225884 A JP2002225884 A JP 2002225884A JP 2002225884 A JP2002225884 A JP 2002225884A JP 2004066520 A JP2004066520 A JP 2004066520A
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Japan
Prior art keywords
plug
heating
melting
heater
melting point
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Granted
Application number
JP2002225884A
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Japanese (ja)
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JP4078916B2 (en
Inventor
Masato Ota
太田　正人
Katsuhide Nishida
西田　克秀
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Shibuya Corp
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Shibuya Kogyo Co Ltd
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Priority to JP2002225884A priority Critical patent/JP4078916B2/en
Publication of JP2004066520A publication Critical patent/JP2004066520A/en
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Publication of JP4078916B2 publication Critical patent/JP4078916B2/en
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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
    • 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
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • B29C66/5326—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially flat
    • B29C66/53261—Enclosing tubular articles between substantially flat elements
    • B29C66/53262—Enclosing spouts between the walls of bags, e.g. of medical bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B29C65/1432—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface direct heating of the surfaces 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
    • 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
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • B29C65/2007—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror" characterised by the type of welding mirror
    • B29C65/203—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror" characterised by the type of welding mirror being several single mirrors, e.g. not mounted on the same tool
    • 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
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical means
    • B29C65/305—Electrical means involving the use of cartridge heaters
    • 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
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    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/7879—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined said parts to be joined moving in a closed path, e.g. a rectangular path
    • B29C65/7882—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined said parts to be joined moving in a closed path, e.g. a rectangular path said parts to be joined moving in a circular path
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/024—Thermal pre-treatments
    • B29C66/0242—Heating, or preheating, e.g. drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/324—Avoiding burr formation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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    • B29C66/90—Measuring or controlling the joining process
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    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91212—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods involving measurement means being part of the welding jaws, e.g. integrated in 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
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    • B29C66/90—Measuring or controlling the joining process
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    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
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    • B29C66/91221—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/90—Measuring or controlling the joining process
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Plasma & Fusion (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Making Paper Articles (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To enable a bung 4 to be melted in a short time only at its outer surface when the bung 4 to be welded to a container 2 made of a resin is previously melted by heating. <P>SOLUTION: The bung 4 is held at a bung holding means 10 provided at an index wheel 6 and intermittently conveyed. A contact-type heater 16 is provided at a first heating position B, and is brought into contact with a fusion bonding part 4a of the bung 4 and heated to a temperature (130°C) lower than a melting point (e.g. 140°C) of a material of the bung 4. A non-contact-type heater 22 is provided at a second heating position C, and the bonding part 4a is heated at a temperature (320-330°C) higher than the melting point without contact with the bung 4. The part 4a of the bung 4 can be heated to the vicinity of the melting point in a short time by the heater 16, but is not melted, and hence a whisker-like projection is not formed, and the part 4a can be heated to the melting point or higher by the heater 22, and can be melted in a short time. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明が属する技術分野】
本発明は、輸液バッグやスタンディングパウチ等の軟質の樹脂製容器に口栓を取り付ける方法および装置に係り、特に、口栓を容器に溶着するために、口栓の溶着部分を予め加熱して溶融する口栓の加熱溶融方法および加熱溶融装置に関するものである。
【０００２】
【従来の技術】
樹脂製のフィルムを材料とした輸液バッグ等の容器に口栓を溶着する場合には、樹脂製の口栓の外周面を予め加熱して溶融した後、二枚のフィルムを重ね合わせて周囲を接合した樹脂製容器の、口栓取付け部を広げてその間に前記口栓を挿入し、その後、容器材料の二枚のフィルムとその間に挿入された口栓とを、一対の加熱部材で両側から挟み込んで加熱することにより、前記容器に口栓を溶着している。
【０００３】
前記のように口栓を加熱溶融する方法としては、リング状のヒータ内に口栓を位置させ、このヒータによって口栓の周囲から非接触状態で加熱する方法（特許第３０４８４８６号）と、口栓の外周面にヒータを直接接触させて加熱する方法とが従来から知られている。
【０００４】
【発明が解決しようとする課題】
前記非接触式のヒータにより口栓を加熱溶融する方法では、口栓が溶融するまでには時間がかかり、高能力化が困難であるとういう問題があった。また、加熱温度を高く設定すると、溶融するまでの時間を短縮することはできるが、口栓とヒータとの位置決め精度を高めないと全体に均一な加熱ができず、溶融ムラを生じ、溶着不良が起こるおそれがある。
【０００５】
さらに、加熱温度を高く設定すると、口栓の表面だけでなく内部まで溶融してしまい、容器に溶着する際に内面側がはみ出してしまう場合があった。しかも、加熱温度を高くするためには、装置全体に断熱材などを装着して耐熱仕様とする必要があり、その分コスト高となってしまうという問題もあった。
【０００６】
また、接触式のヒータによって口栓を加熱溶融する場合には、口栓にヒータを接触させて加熱し溶融した後、ヒータを口栓から離すときに、溶けた口栓の表面がヒータに付着してその一部が延び、ひげ状の突起ができてしまうという問題があった。そして、このひげができた口栓をそのまま容器に溶着すると、異物が発生した状態となってしまう。
【０００７】
本発明は前記課題を解決するためになされたもので、口栓の表面だけを短時間で確実に加熱溶融する口栓の加熱溶融方法および口栓の加熱溶融装置を提供することを目的とするものである。
【０００８】
【課題を解決するための手段】
第１の発明に係る口栓の加熱溶融方法は、容器となる材料に溶着する口栓の外面を加熱して溶融する方法であって、特に、口栓の溶着部分に接触する加熱手段によって、この口栓を融点以下の温度で加熱した後、口栓に接触しない加熱手段によって、前記溶着部分を融点以上の温度で加熱するようにしたものである。
【０００９】
この発明に係る口栓の加熱溶融方法では、加熱手段を口栓に接触させて加熱する際には、加熱温度を口栓の材質の融点以下に設定しているので、口栓の温度は上昇するが溶融することはなく、接触していたヒータを口栓から離す際に、口栓の表面にひげ状の突起ができてしまうことがない。また、その後、加熱手段を口栓に接触させずに、融点よりも高い温度で加熱することにより表面を溶融するので、当初から非接触型の加熱手段で加熱した場合よりも短時間で必要な温度まで加熱してその表面を溶融することができ、しかも、高熱で長時間加熱した場合のように口栓の内部側まで溶けてしまうことはない。
【００１０】
また、第２の発明に係る口栓の加熱溶融装置は、容器となる材料に溶着する口栓の外面を加熱して溶融する装置であって、特に、口栓を保持する保持手段と、口栓の溶着部分に接触して融点以下の温度で加熱する第１加熱手段と、口栓に接触せずに、前記溶着部分を融点以上の温度で加熱する第２加熱手段とを備えたことを特徴とするものである。
【００１１】
この発明に係る口栓の加熱溶融装置では、保持手段が保持している口栓に第１加熱手段を接触させて加熱するが、加熱温度を融点以下の温度に設定しているので、口栓の表面が溶融することはない。そして、第１加熱手段によって口栓を溶融しない程度に加熱した後、第２加熱手段によって非接触状態で融点以上の温度で加熱することにより、口栓の表面を溶融する。従って、非接触式加熱手段だけで加熱溶融した場合よりも短時間で口栓の表面を溶融することができ、しかも、接触式加熱手段によって溶融した場合のように、口栓の表面にひげ状の突起ができることがない。
【００１２】
さらに、請求項３に記載の発明に係る口栓の加熱溶融装置は、前記保持手段を搬送する搬送手段を設け、保持手段が保持する口栓を第１加熱手段から第２加熱手段へ搬送することを特徴とするものである。
【００１３】
この発明では、口栓を保持した保持手段を搬送手段によって搬送することにより、口栓を第１加熱手段および第２加熱手段に順次供給することができ、２段階の加熱処理を連続して行うことができる。
【００１４】
【発明の実施の形態】
以下、図面に示す実施の形態により本発明を説明する。図１は、本発明の一実施の形態に係る口栓の加熱溶融装置の全体の構成を簡略化して示す平面図、図２は、前記口栓の加熱溶融装置に設けられた第１の加熱手段である接触型ヒータの縦断面図、図３は、その加熱溶融装置に設けられた第２の加熱手段である非接触型ヒータの縦断面図である。この実施の形態に係る口栓の加熱溶融装置は、樹脂製のフィルムを二枚重ね合わせ四辺をシールしてバッグ状にした容器材料（容器２の完成前の状態）２Ａに口栓４を取り付ける際に、その口栓２の容器材料２Ａへの溶着部分４ａを予め溶融しておくために、その溶着部分４ａを加熱する装置である。
【００１５】
図１において、６は回転する中心軸８上に固定されて所定角度（この実施の形態では９０度）ずつ間欠的に回転するインデックスホイールであり、このインデックスホイール６の外周部には、等角度間隔で４個所の口栓保持手段１０（図２および図３参照）が設けられている。インデックスホイール６の９０度ずつの間欠回転によりこれら口栓保持手段１０が停止する位置には、口栓供給ポジションＡ、第１加熱ポジションＢ、第２加熱ポジションＣおよび口栓取り出しポジションＤが順次設けられている。
【００１６】
口栓供給ポジションＡには口栓供給用のシュート１２が設けられており、多数の口栓４が整列されて連続的に送られてくる。口栓供給シュート１２の出口にはストッパ１４が設けられており、シュート１２内に突出して口栓４に係合する位置と、シュート１２外に退出して口栓４に係合しない位置とに進退動できるようになっている。このストッパ１４は、通常はシュート１２内に突出してシュート１２上を送られてきた口栓４をシュート１２の出口に停止させておき、前記インデックスホイール６の口栓保持手段１０が口栓供給ポジションＡに停止したときに、後退して先頭の口栓４を口栓保持手段１０に送り出す。なお、口栓保持手段１０に口栓４を供給する手段は、口栓供給用シュート１２に限るものではなく、例えばロボットのようなその他の供給手段を用いるようにしても良い。
【００１７】
前記口栓供給ポジションＡでシュート１２から口栓４を受け取った口栓保持手段１０は、インデックスホイール６が１ピッチ（９０度）回転すると、次の第１加熱ポジションＢに移動して停止する。第１加熱ポジションＢには第１加熱手段（接触型ヒータ）１６が設けられている。第１加熱手段１６は、図１および図２に示すように、一対の対向するヒータ部材１６Ａ、１６Ｂを備えている。これら一対のヒータ部材１６Ａ、１６Ｂは、それぞれ口栓４の溶着部分４ａの外径と一致する内径の半円形凹部１６Ａａ、１６Ｂａを有しており、これら両ヒータ部材１６Ａ、１６Ｂを突き合わせると、両半円形凹部１６Ａａ、１６Ｂａが口栓４の容器材料２Ａへの溶着部分４ａの外周面に密着する。
【００１８】
各ヒータ部材１６Ａ、１６Ｂは、口栓４の溶着部分４ａに接触する前記凹部１６Ａａ、１６Ｂａが形成された加熱部１６Ａｂ、１６Ｂｂと、これら各加熱部１６Ａｂ、１６Ｂｂの背後に埋設された発熱ヒータ１６Ａｃ、１６Ｂｃを備えている。この第１加熱手段１６は接触型ヒータであり、発熱ヒータ１６Ａｃ、１６Ｂｃに通電し、加熱部１６Ａｂ、１６Ｂｂの温度を上昇させた状態にして、両加熱部１６Ａｂ、１６Ｂｂの半円形凹部１６Ａａ、１６Ｂａを口栓４の溶着部分４ａに接触させることにより、口栓４の溶着部分４ａを加熱する。
【００１９】
前記一対のヒータ部材１６Ａ、１６Ｂは、それぞれ水平方向に配置されたスライドシリンダ１８Ａ、１８Ｂによって進退動できるようになっており、同時に後退して互いに離隔したときには、その間に口栓４の溶着部分４ａを挿入することができ、前進して互いに接近したときには、両ヒータ部材１６Ａ、１６Ｂの凹部１６Ａａ、１６Ｂａが向かい合って、口栓４の溶着部分４ａの外面の全周に亘って密着する。両ヒータ部材１６Ａ、１６Ｂをそれぞれ進退動させるスライドシリンダ１８Ａ、１８Ｂは、垂直方向に進退動する昇降用シリンダ２０のピストンロッド２０ａに固定された水平な支持プレート２１に取り付けられており、昇降用シリンダ２０の作動により一体的に昇降される。
【００２０】
第１加熱ポジションＢの９０度下流側に第２加熱ポジションＣが設けられており、インデックスホイール６がさらに１ピッチ回転すると、口栓４を保持した口栓保持手段１０は、第１加熱ポジションＢから第２加熱ポジションＣに移動して停止する。第２加熱ポジションＣには、口栓４の外面に接触せず周囲から加熱する第２加熱手段（非接触型ヒータ）２２が設けられている。
【００２１】
第２加熱手段２２は、図１および図３に示すように、リング状のヒータからなっており、その内周側に円筒状の加熱部２２ａを有している。この加熱部２２ａの外周側に発熱ヒータ２２ｂが設けられており、この発熱ヒータ２２ｂに通電して温度を上昇させることにより、加熱部２２ａを介して口栓４の溶着部分４ａを加熱する。加熱部２２ａの内径は口栓４の溶着部分４ａの外径よりも大きくなっており、加熱部２２ａ内に口栓４の溶着部分４ａを挿入すると、加熱部２２ａの内周面と口栓４の溶着部分４ａの外周面とが全周に亘り等しい間隔を隔てて対向する。前記加熱部２２ａは交換可能になっており、この加熱部２２ａを交換することにより、その内周面と加熱される口栓４の溶着部分４ａの外周面との距離を変更することができる。また、加熱部２２ａには温度センサ２４が設けられており、その検出温度に応じて、口栓４を加熱する温度を制御するようになっている。
【００２２】
リング状ヒータ２２は、昇降用シリンダ２６によって昇降されるようになっており、インデックスホイール６が回転して、第１加熱ポジションＡで第１次の加熱処理が行われた口栓４をこの第２加熱ポジションＣに搬送する際に、口栓４と干渉しないように上昇される。その後、その口栓４を加熱する際には、昇降用シリンダ２６によってリング状ヒータ２２を下降させ、口栓４の溶着部分４ａの周囲を囲む位置に停止させる。
【００２３】
さらに、第２加熱ポジションＣの９０度下流側には、口栓取り出しポジションＤが設けられており、前記第１加熱ポジションＢおよび第２加熱ポジションＣで第１次加熱処理および第２次加熱処理が行われた口栓４は、インデックスホイール６の次の１ピッチの回転によりこの口栓取り出しポジションＤに移動して停止される。この口栓取り出しポジションＤには、ロボット等の図示しない口栓取り出し手段が設けられており、この取り出し手段によって、口栓保持手段１０から口栓４が取り出され、口栓溶着ポジションＥまで搬送されている前記容器材料２Ａの口栓取付部２Ａａに挿入される。そして、この口栓溶着ポジションＥに設けられた溶着手段（図示せず）によって、容器材料である両側の二枚のフィルムとその間に挿入された口栓４の溶着部分４ａとが溶着され、口栓取付部２Ａａが密封される。
【００２４】
前記口栓の加熱溶融装置の作動について説明する。口栓供給シュート１２によって整列された状態で送られてきた口栓４が、前進したストッパ１４によってシュート１２の出口に停止している。インデックスホイール６が回転して空の容器保持手段１０が口栓供給ポジションＡに停止すると、ストッパ１４が後退して先頭の口栓４を容器保持手段１０に送り出す。ストッパ１４は先頭の口栓４を送り出した後、直ちにシュート１２内に前進して次の口栓４をシュート１２の出口に停止させる。
【００２５】
口栓保持手段１０が口栓４を受け取ると、インデックスホイール６は９０度回転し、その口栓４を第１加熱ポジションＢまで搬送する。口栓４が搬送されてくる時点では、第１加熱ポジションＡに設けられている一対の向かい合うヒータ部材１６Ａ、１６Ｂが、それぞれのスライド用シリンダ１８Ａ、１８Ｂの作動によって後退されて互いに離隔するとともに、昇降用シリンダ２０によって上昇している。
【００２６】
前記のように口栓保持手段１０に保持された口栓４がこの第１加熱ポジションＢに供給されると、先ず、昇降用シリンダ２０により両ヒータ部材１６Ａ、１６Ｂが下降した後、スライド用シリンダ１８Ａ、１８Ｂによって両ヒータ部材１６Ａ、１６Ｂが前進し、各加熱部１６Ａｂ、１６Ｂｂの半円形凹部１６Ａａ、１６Ｂａが口栓４の溶着部分４ａの外面に密着する。各加熱部１６Ａｂ、１６Ｂｂは背後に設けられた加熱ヒータ１６Ａｃ、１６Ｂｃによって所定の温度に加熱されており、口栓４の溶着部分４ａは、接触した加熱部１６Ａｂ、１６Ｂｂによって加熱される。
【００２７】
この実施の形態では、第１加熱手段１６によって口栓４を加熱する際の加熱部１６Ａｂ、１６Ｂｂの温度が、口栓４の材質の融点以下の温度になるように設定してある。例えば、口栓４の材質の融点が１４０℃である場合に、加熱部１６Ａａ、１６Ｂａの温度を１３０℃に設定する。このように融点以下で、かつ融点に近い温度に設定して、例えば、７〜８秒間の加熱を行う。この接触型の第１加熱手段１６では、口栓４は加熱されて温度が上昇するが、融点には達しないので溶融することはない。従って、接触していたヒータ部材１６Ａ、１６Ｂの加熱部１６Ａｂ、１６Ｂｂを口栓４から離すときに、溶融している口栓４の外面がひげ状に延びてしまうことがない。
【００２８】
前記第１加熱ポジションＢで第１次の加熱処理が行われた口栓４は、インデックスホイール６の次の１ピッチの回転により、第２加熱ポジションＣまで搬送される。この第２加熱ポジションＣに設けられている第２加熱手段である非接触型のリングヒータ２２は、口栓４が搬送されてくる時点では、口栓４に干渉しないように昇降用シリンダ２６によって上昇されている。そして、口栓４が第２加熱ポジションＣに停止すると、昇降用シリンダ２６によってリングヒータ２２は下降され、加熱部２２ａの内周面が口栓４の溶着部分４ａの外周面に所定の間隙を隔てて対向する。
【００２９】
このリングヒータ２２は、口栓４の材質の融点以上の温度で口栓４の溶着部分４ａを加熱する。例えば、前記のように口栓４の材質の融点が１４０℃である場合に、３２０℃〜３３０℃で９〜１０秒間、非接触状態で加熱する。前記第１加熱ポジションＢの接触型ヒータ１６で、口栓４の融点に近い温度で加熱した後に、この第２加熱ポジションＣの非接触型のリングヒータ２２で加熱することにより、口栓４の溶着部分４ａを短時間で溶融することができる。しかも、加熱する時間が短いので、口栓４の内部まで溶融してしまうことがなく、外面だけを溶融することができる。
【００３０】
第２加熱ポジションＣで加熱され容器２Ａへの溶着部分４ａが溶融された口栓４は、その後、インデックスホイール６の回転により口栓取り出しポジションＤに移動される。一方、口栓４が溶着される容器２は、上下二枚のフィルムの周囲がシールされたバッグ状の容器材料２Ａとして、口栓取付ポジションＥに供給されてくる。この容器材料２Ａは、四辺がシールされているが、口栓４の取付部２Ａａおよび後に内容液が充填される際の充填ノズル挿入部がシールされない状態で残されている。そして、前記口栓取り出しポジションＤに送られてきた口栓４は、図示しないロボット等の口栓取り出し手段によって取り出されて、前記口栓取付ポジションＥに供給されている容器（容器材料）２Ａの口栓取付部２Ａａ内に挿入される。
【００３１】
前述のように容器材料２Ａの口栓取付部２Ａａはシールされていないが、二枚のフィルムが重ね合わされて密着した状態になっているので、吸盤その他の開放手段によって二枚のフィルムを引き離してその間に口栓４を挿入する。口栓取付ポジションＥには、口栓溶着手段（図示せず）が設けられており、容器材料２Ａの二枚のフィルム間に挿入された口栓４を、両フィルムの両側から挟み込んで加熱することにより溶着する。このときの加熱温度は、前記のように口栓４の材質の融点が１４０℃で、容器材料２Ａのフィルムの融点も同じ１４０℃である場合に、例えば、１５０℃とする。この温度で加熱して容器２Ａに口栓４を溶着した後、常温で冷却する。このように口栓４の外面だけを溶融して容器材料２Ａに溶着するようにしているので、口栓４の内面がはみ出ることもなく、確実に溶着することができる。
【００３２】
なお、本発明は、前記実施の形態で説明した構造に限定されるものではなく、各部の形状、構造等を適宜変形、変更しうることはいうまでもない。例えば、口栓４および容器２（容器材料２Ａ）の形状は図示の構成に限定されるものではなく、また、口栓４および容器材料２Ａの融点や加熱温度は一例である。さらに、第１加熱手段１６および第２加熱手段２２の構成も図示のものに限定されないことはいうまでもない。
【００３３】
【発明の効果】
以上説明したように本発明に係る口栓の加熱溶融方法は、口栓の溶着部分に接触する加熱手段によって、この口栓を融点以下の温度で加熱した後、口栓に接触しない加熱手段によって、前記溶着部分を融点以上の温度で加熱するようにしたので、口栓の外面だけを短時間で確実に溶融することができる。特に、接触型の加熱手段によって口栓の材質の融点以上の温度で加熱して溶融した場合に、加熱手段を口栓から離す際に発生していたひげ状の突起ができることなく、また、非接触型加熱手段だけで加熱溶融する場合のように、長い時間を必要とせず、しかも、口栓の内部まで溶融して容器に溶着する際に内面が溶け出してしまうこともない。
【００３４】
また、第２の発明に係る口栓の加熱溶融装置は、口栓を保持する保持手段と、口栓の溶着部分に接触して融点以下の温度で加熱する第１加熱手段と、口栓に接触せずに、前記溶着部分を融点以上の温度で加熱する第２加熱手段とを備えたことにより、口栓の外面のみを素早く確実に溶融することができる。しかも、ひげ状の突起ができることなく、口栓の内部まで溶融して容器に溶着する際に内面が溶け出すこともない。
【図面の簡単な説明】
【図１】本発明の一実施の形態に係る口栓の加熱溶融装置の全体の構成を簡略化して示す平面図である。
【図２】前記口栓の加熱溶融装置に設けられた接触型加熱手段の一例を示す縦断面図である。
【図３】前記口栓の加熱溶融装置に設けられた非接触型加熱手段の一例を示す縦断面図である。
【符号の説明】
２　　容器
２Ａ　容器となる材料
４　　口栓
４ａ　口栓の溶着部分
１０　　口栓の保持手段
１６　　第１加熱手段（接触型ヒータ）
２２　　第２加熱手段（非接触型ヒータ）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for attaching a spout to a soft resin container such as an infusion bag or a standing pouch, and in particular, in order to weld the spout to the container, the welding portion of the spout is heated and melted in advance. The present invention relates to a method and apparatus for heating and melting a plug to be heated.
[0002]
[Prior art]
When welding a plug to a container such as an infusion bag made of a resin film as a material, the outer surface of the resin plug is heated and melted in advance, and then the two films are stacked and the periphery is superimposed. Spread the plug attachment portion of the joined resin container, insert the plug between them, and then insert the two films of container material and the plug inserted between them with a pair of heating members from both sides. The cap is welded to the container by sandwiching and heating.
[0003]
As a method for heating and melting the plug as described above, a method of positioning the plug in a ring-shaped heater and heating the periphery of the plug in a non-contact state by the heater (Japanese Patent No. 3048486), Conventionally, a method in which a heater is brought into direct contact with an outer peripheral surface of a stopper to heat the stopper is known.
[0004]
[Problems to be solved by the invention]
In the method in which the plug is heated and melted by the non-contact type heater, it takes a long time until the plug is melted, and there is a problem that it is difficult to increase the capacity. If the heating temperature is set high, the time until melting can be shortened, but if the positioning accuracy between the plug and the heater is not improved, uniform heating cannot be achieved as a whole, resulting in uneven melting and poor welding. May occur.
[0005]
Furthermore, if the heating temperature is set high, the plug may be melted not only on the surface but also inside the plug, and the inner surface may protrude when welding to the container. In addition, in order to increase the heating temperature, it is necessary to mount a heat insulating material or the like on the entire apparatus to have a heat-resistant specification, resulting in a problem that the cost is increased accordingly.
[0006]
When the plug is heated and melted by a contact type heater, the surface of the melted plug adheres to the heater when the heater is separated from the plug after the heater is brought into contact with the plug and heated and melted. Then, there is a problem that a part thereof extends to form a whisker-like projection. If the bearded plug is welded to the container as it is, a foreign substance is generated.
[0007]
The present invention has been made in order to solve the above-described problems, and has an object to provide a method and apparatus for heating and melting a plug that reliably heats and melts only the surface of the plug in a short time. Things.
[0008]
[Means for Solving the Problems]
The method of heating and melting a plug according to the first invention is a method of heating and melting an outer surface of the plug to be welded to a material to be a container, and in particular, by a heating unit that contacts a welded portion of the plug, After the plug is heated at a temperature lower than the melting point, the welded portion is heated at a temperature higher than the melting point by heating means that does not contact the plug.
[0009]
In the method for heating and melting a plug according to the present invention, when the heating means is brought into contact with the plug and heated, the heating temperature is set to be equal to or lower than the melting point of the material of the plug. However, there is no melting, and no beard-like projection is formed on the surface of the plug when the contacted heater is separated from the plug. Further, thereafter, without contacting the heating means with the plug, the surface is melted by heating at a temperature higher than the melting point, so it is necessary in a shorter time than when heating by a non-contact type heating means from the beginning. The surface can be melted by heating to the temperature, and it does not melt down to the inside of the plug as in the case of heating for a long time with high heat.
[0010]
Further, the apparatus for heating and melting a plug according to the second invention is an apparatus for heating and melting an outer surface of the plug to be welded to a material to be a container, and particularly, holding means for holding the plug, A first heating means for heating at a temperature equal to or lower than the melting point by contacting the welded portion of the plug; and a second heating means for heating the welded portion at a temperature equal to or higher than the melting point without contacting the spout. It is a feature.
[0011]
In the apparatus for heating and melting a plug according to the present invention, heating is performed by bringing the first heating means into contact with the plug held by the holding means. However, since the heating temperature is set to a temperature equal to or lower than the melting point, the plug is heated. Does not melt. After the plug is heated by the first heating means to such an extent that the plug is not melted, the surface of the plug is melted by heating the plug at a temperature higher than the melting point in a non-contact state by the second heating means. Therefore, the surface of the plug can be melted in a shorter time than the case where it is heated and melted only by the non-contact type heating means, and the whiskers are formed on the surface of the plug as in the case of melting by the contact type heating means. No protrusion is formed.
[0012]
Further, the apparatus for heating and melting a plug according to the invention according to claim 3 is provided with a conveying means for conveying the holding means, and conveys the plug held by the holding means from the first heating means to the second heating means. It is characterized by the following.
[0013]
According to the present invention, the plug is sequentially supplied to the first heating unit and the second heating unit by transporting the holding unit holding the plug by the transport unit, and the two-stage heating process is continuously performed. be able to.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. FIG. 1 is a plan view schematically showing the overall structure of a plug heating and melting apparatus according to an embodiment of the present invention. FIG. 2 is a first heating apparatus provided in the plug heating and melting apparatus. FIG. 3 is a longitudinal sectional view of a contact type heater as a means, and FIG. 3 is a longitudinal sectional view of a non-contact type heater as a second heating means provided in the heating and melting device. The apparatus for heating and melting a plug according to the present embodiment, when attaching the plug 4 to a container material (state before completion of the container 2) 2A in which two resin films are stacked and four sides are sealed to form a bag. This is a device for heating the welded portion 4a of the plug 2 in order to melt the welded portion 4a of the plug 2 to the container material 2A in advance.
[0015]
In FIG. 1, reference numeral 6 denotes an index wheel which is fixed on a rotating central axis 8 and rotates intermittently by a predetermined angle (in this embodiment, 90 degrees). Four plug holding means 10 (see FIGS. 2 and 3) are provided at four intervals. At the position where the plug holding means 10 stops by the intermittent rotation of the index wheel 6 by 90 degrees, a plug supply position A, a first heating position B, a second heating position C, and a plug removal position D are sequentially provided. Have been.
[0016]
A plug supply chute 12 is provided at the plug supply position A, and a large number of plugs 4 are aligned and continuously sent. A stopper 14 is provided at the outlet of the plug supply chute 12. The stopper 14 protrudes into the chute 12 and engages with the plug 4, and moves out of the chute 12 and does not engage with the plug 4. You can move forward and backward. The stopper 14 normally stops the plug 4 that has protruded into the chute 12 and has been sent over the chute 12 at the outlet of the chute 12, and the plug holding means 10 of the index wheel 6 sets the plug supply position. When it stops at A, it retracts and sends out the top plug 4 to the plug holding means 10. Note that the means for supplying the plug 4 to the plug holding means 10 is not limited to the plug supply chute 12, and other supply means such as a robot may be used.
[0017]
The plug holding means 10 receiving the plug 4 from the chute 12 at the plug supply position A moves to the next first heating position B and stops when the index wheel 6 rotates one pitch (90 degrees). In the first heating position B, a first heating means (contact type heater) 16 is provided. As shown in FIGS. 1 and 2, the first heating means 16 includes a pair of opposed heater members 16A and 16B. The pair of heater members 16A, 16B have semicircular recesses 16Aa, 16Ba having an inner diameter corresponding to the outer diameter of the welded portion 4a of the plug 4, respectively. When these heater members 16A, 16B are abutted, Both semicircular recesses 16Aa and 16Ba are in close contact with the outer peripheral surface of the welded portion 4a of the plug 4 to the container material 2A.
[0018]
Each of the heater members 16A and 16B includes a heating portion 16Ab and 16Bb in which the concave portions 16Aa and 16Ba are formed to be in contact with the welded portion 4a of the plug 4, and a heating heater 16Ac embedded behind the heating portions 16Ab and 16Bb. , 16Bc. The first heating means 16 is a contact-type heater, and energizes the heating heaters 16Ac, 16Bc to raise the temperature of the heating sections 16Ab, 16Bb, and to make the semicircular recesses 16Aa, 16Ba of both heating sections 16Ab, 16Bb. Is brought into contact with the welded portion 4a of the plug 4 to heat the welded portion 4a of the plug 4.
[0019]
The pair of heater members 16A and 16B can be moved forward and backward by slide cylinders 18A and 18B respectively arranged in the horizontal direction. When the heater members 16A and 16B are simultaneously moved backward and separated from each other, the welding portion 4a of the plug 4 is interposed therebetween. When the heater members 16A and 16B move forward and approach each other, the concave portions 16Aa and 16Ba of the heater members 16A and 16B face each other and come into close contact with the entire outer surface of the welded portion 4a of the plug 4. The slide cylinders 18A and 18B for moving the heater members 16A and 16B forward and backward respectively are attached to a horizontal support plate 21 fixed to a piston rod 20a of a vertically moving cylinder 20 for vertically moving. As a result of the operation of 20, the ascent and descent are performed integrally.
[0020]
A second heating position C is provided 90 degrees downstream of the first heating position B, and when the index wheel 6 is further rotated by one pitch, the plug holding means 10 holding the plug 4 moves to the first heating position B. To the second heating position C and stop. At the second heating position C, a second heating means (non-contact type heater) 22 for heating from the surroundings without contacting the outer surface of the plug 4 is provided.
[0021]
As shown in FIGS. 1 and 3, the second heating means 22 is formed of a ring-shaped heater, and has a cylindrical heating portion 22a on its inner peripheral side. A heating heater 22b is provided on the outer peripheral side of the heating unit 22a, and the welding portion 4a of the plug 4 is heated via the heating unit 22a by energizing the heating heater 22b to increase the temperature. The inner diameter of the heating part 22a is larger than the outer diameter of the welding part 4a of the plug 4 and when the welding part 4a of the plug 4 is inserted into the heating part 22a, the inner peripheral surface of the heating part 22a and the plug 4 And the outer peripheral surface of the welded portion 4a is opposed at equal intervals over the entire circumference. The heating part 22a is replaceable, and by replacing the heating part 22a, the distance between the inner peripheral surface and the outer peripheral surface of the welded portion 4a of the plug 4 to be heated can be changed. Further, a temperature sensor 24 is provided in the heating unit 22a, and the temperature at which the plug 4 is heated is controlled in accordance with the detected temperature.
[0022]
The ring-shaped heater 22 is moved up and down by an elevating cylinder 26, and the index wheel 6 is rotated so that the plug 4 that has been subjected to the first heating process at the first heating position A is moved to the second position. 2 When transported to the heating position C, it is raised so as not to interfere with the plug 4. Thereafter, when heating the plug 4, the ring-shaped heater 22 is lowered by the elevating cylinder 26 and is stopped at a position surrounding the welded portion 4 a of the plug 4.
[0023]
Further, a plug removal position D is provided 90 degrees downstream of the second heating position C, and the first heating process and the second heating process are performed at the first heating position B and the second heating position C, respectively. Is moved to this plug removal position D by the rotation of the index wheel 6 for the next one pitch, and stopped. At the plug removing position D, a plug removing means (not shown) such as a robot is provided. With this extracting means, the plug 4 is removed from the plug holding means 10 and transported to the plug welding position E. Is inserted into the plug attaching portion 2Aa of the container material 2A. Then, the welding means (not shown) provided at the plug welding position E welds the two films on both sides as the container material and the welded portion 4a of the plug 4 inserted between them, and The plug mounting portion 2Aa is sealed.
[0024]
The operation of the heating and melting device for the plug will be described. The plug 4 sent in a state of being aligned by the plug supply chute 12 is stopped at the outlet of the chute 12 by the stopper 14 which has been advanced. When the index wheel 6 rotates and the empty container holding means 10 stops at the plug supply position A, the stopper 14 retreats and sends out the first plug 4 to the container holding means 10. Immediately after the stopper 14 sends out the first plug 4, the stopper 14 advances into the chute 12 and stops the next plug 4 at the outlet of the chute 12.
[0025]
When the plug holding means 10 receives the plug 4, the index wheel 6 rotates 90 degrees and conveys the plug 4 to the first heating position B. At the time when the plug 4 is conveyed, the pair of opposed heater members 16A, 16B provided at the first heating position A are retracted by the operation of the respective slide cylinders 18A, 18B and separated from each other, It is raised by the lifting cylinder 20.
[0026]
When the plug 4 held by the plug holding means 10 as described above is supplied to the first heating position B, first, the heater members 16A, 16B are lowered by the lifting cylinder 20, and then the sliding cylinder is moved. The heater members 16A, 16B are advanced by 18A, 18B, and the semicircular concave portions 16Aa, 16Ba of the respective heating portions 16Ab, 16Bb are brought into close contact with the outer surface of the welded portion 4a of the plug 4. Each of the heating sections 16Ab and 16Bb is heated to a predetermined temperature by heaters 16Ac and 16Bc provided at the back, and the welded portion 4a of the plug 4 is heated by the contacting heating sections 16Ab and 16Bb.
[0027]
In this embodiment, the temperature of the heating parts 16Ab and 16Bb when the plug 4 is heated by the first heating means 16 is set to be lower than the melting point of the material of the plug 4. For example, when the melting point of the material of the plug 4 is 140 ° C., the temperatures of the heating units 16Aa and 16Ba are set to 130 ° C. As described above, the temperature is set to a temperature lower than or close to the melting point, and heating is performed for, for example, 7 to 8 seconds. In this contact-type first heating means 16, the plug 4 is heated and its temperature rises, but does not reach the melting point and thus does not melt. Therefore, when the heating portions 16Ab and 16Bb of the heater members 16A and 16B that have come into contact with each other are separated from the plug 4, the molten outer surface of the plug 4 does not extend like a whisker.
[0028]
The plug 4 on which the first heating process has been performed at the first heating position B is conveyed to the second heating position C by the rotation of the index wheel 6 at the next one pitch. When the plug 4 is conveyed, the non-contact type ring heater 22 serving as the second heating means provided at the second heating position C is moved by the lifting / lowering cylinder 26 so as not to interfere with the plug 4. Has been rising. When the plug 4 is stopped at the second heating position C, the ring heater 22 is lowered by the elevating cylinder 26, so that the inner peripheral surface of the heating unit 22a has a predetermined gap on the outer peripheral surface of the welded portion 4a of the plug 4. Opposite at a distance.
[0029]
The ring heater 22 heats the welded portion 4 a of the plug 4 at a temperature equal to or higher than the melting point of the material of the plug 4. For example, when the melting point of the material of the plug 4 is 140 ° C. as described above, heating is performed in a non-contact state at 320 ° C. to 330 ° C. for 9 to 10 seconds. The contact type heater 16 at the first heating position B heats the plug 4 at a temperature close to the melting point of the plug 4, and then the non-contact ring heater 22 at the second heating position C heats the plug 4. The welded portion 4a can be melted in a short time. In addition, since the heating time is short, the inside of the plug 4 is not melted, and only the outer surface can be melted.
[0030]
The plug 4 heated at the second heating position C and having the portion 4a welded to the container 2A melted is then moved to the plug removal position D by the rotation of the index wheel 6. On the other hand, the container 2 to which the plug 4 is welded is supplied to the plug mounting position E as a bag-shaped container material 2A in which the upper and lower two films are sealed. Although the container material 2A is sealed on four sides, the mounting portion 2Aa of the plug 4 and the filling nozzle insertion portion when the content liquid is filled later are left unsealed. The plug 4 sent to the plug removing position D is removed by a plug removing means such as a robot (not shown), and the container (container material) 2A supplied to the plug mounting position E is removed. It is inserted into the plug attachment part 2Aa.
[0031]
As described above, the plug attachment portion 2Aa of the container material 2A is not sealed, but since the two films are superimposed and in close contact with each other, the two films are separated by a suction cup or other opening means. In the meantime, the plug 4 is inserted. A plug welding means (not shown) is provided at the plug mounting position E, and the plug 4 inserted between the two films of the container material 2A is sandwiched and heated from both sides of both films. Welding. The heating temperature at this time is, for example, 150 ° C. when the melting point of the material of the plug 4 is 140 ° C. and the melting point of the film of the container material 2A is 140 ° C. as described above. After heating at this temperature to weld the plug 4 to the container 2A, it is cooled at room temperature. Since only the outer surface of the plug 4 is melted and welded to the container material 2A in this way, the inner surface of the plug 4 can be reliably welded without protruding.
[0032]
The present invention is not limited to the structure described in the above embodiment, and it goes without saying that the shape, structure, and the like of each part can be appropriately modified or changed. For example, the shapes of the plug 4 and the container 2 (container material 2A) are not limited to the illustrated configuration, and the melting point and the heating temperature of the plug 4 and the container material 2A are examples. Furthermore, it goes without saying that the configurations of the first heating means 16 and the second heating means 22 are not limited to those shown in the drawings.
[0033]
【The invention's effect】
As described above, the method of heating and melting a plug according to the present invention is performed by a heating unit that contacts a welded portion of the plug, by heating the plug at a temperature equal to or lower than the melting point, and then by a heating unit that does not contact the plug. Since the welded portion is heated at a temperature equal to or higher than the melting point, only the outer surface of the plug can be reliably melted in a short time. In particular, when heated at a temperature equal to or higher than the melting point of the material of the plug by the contact-type heating means and melted, the beard-like projections generated when the heating means is separated from the plug are not formed, and Unlike the case of heating and melting only by the contact type heating means, a long time is not required, and the inner surface does not melt when the inside of the plug is melted and welded to the container.
[0034]
In addition, the apparatus for heating and melting a plug according to the second invention includes a holding unit that holds the plug, a first heating unit that contacts a welded portion of the plug and heats the plug at a temperature equal to or lower than a melting point. By providing the second heating means for heating the welded portion at a temperature equal to or higher than the melting point without contact, only the outer surface of the plug can be quickly and reliably melted. Moreover, no beard-like projections are formed, and the inner surface does not melt when the inside of the plug is melted and welded to the container.
[Brief description of the drawings]
FIG. 1 is a simplified plan view showing the overall configuration of a heating and melting apparatus for a plug according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing an example of a contact type heating means provided in the heating and melting device for a plug.
FIG. 3 is a longitudinal sectional view showing an example of a non-contact type heating means provided in the heating and melting device for the plug.
[Explanation of symbols]
2 Container 2A Material 4 to be Container 4 Plug 4a Plug welding part 10 Plug holding means 16 First heating means (contact type heater)
22 Second heating means (non-contact type heater)

Claims (3)

容器となる材料に溶着する口栓の外面を加熱して溶融する口栓の加熱溶融方法において、
口栓の溶着部分に接触する加熱手段によって、この口栓を融点以下の温度で加熱した後、口栓に接触しない加熱手段によって、前記溶着部分を融点以上の温度で加熱することを特徴とする口栓の加熱溶融方法。In a method for heating and melting a plug that heats and melts the outer surface of the plug to be welded to a material to be a container,
After the plug is heated at a temperature lower than the melting point by a heating means that contacts the welded portion of the plug, the welded portion is heated at a temperature equal to or higher than the melting point by a heating means that does not contact the plug. The method of heating and melting the plug. 容器となる材料に溶着する口栓の外面を加熱して溶融する口栓の加熱溶融装置において、
口栓を保持する保持手段と、口栓の溶着部分に接触して融点以下の温度で加熱する第１加熱手段と、口栓に接触せずに、前記溶着部分を融点以上の温度で加熱する第２加熱手段とを備えたことを特徴とする口栓の加熱溶融装置。In a heating and melting device for a plug that heats and melts the outer surface of the plug to be welded to a material to be a container,
Holding means for holding the plug, first heating means for contacting the welded portion of the plug and heating at a temperature below the melting point, and heating the welded portion at a temperature above the melting point without contacting the plug. An apparatus for heating and melting a plug, comprising a second heating means. 前記保持手段を搬送する搬送手段を設け、保持手段が保持する口栓を第１加熱手段から第２加熱手段へ搬送することを特徴とする請求項２に記載の口栓の加熱溶融装置。3. The apparatus for heating and melting a plug according to claim 2, further comprising a transfer unit for transferring the holding unit, and transferring the plug held by the holding unit from the first heating unit to the second heating unit.
JP2002225884A 2002-08-02 2002-08-02 Method and apparatus for heating and melting plugs Expired - Fee Related JP4078916B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007268885A (en) * 2006-03-31 2007-10-18 Tokyo Autom Mach Works Ltd Check valve mounting apparatus
JP2012120765A (en) * 2010-12-10 2012-06-28 Terumo Corp Method for manufacturing medical bag, and medical bag
EP3943279A1 (en) * 2020-07-24 2022-01-26 Mespack, S.L. Machine for welding a plastic spout to a plastic package

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007268885A (en) * 2006-03-31 2007-10-18 Tokyo Autom Mach Works Ltd Check valve mounting apparatus
JP4646235B2 (en) * 2006-03-31 2011-03-09 株式会社東京自働機械製作所 Check valve mounting device
JP2012120765A (en) * 2010-12-10 2012-06-28 Terumo Corp Method for manufacturing medical bag, and medical bag
CN102555296A (en) * 2010-12-10 2012-07-11 泰尔茂株式会社 Manufacturing Method Of Medical Bag And Medical Bag Thereof
CN102555296B (en) * 2010-12-10 2017-09-01 泰尔茂株式会社 The manufacture method and medical bag of medical bag
EP3943279A1 (en) * 2020-07-24 2022-01-26 Mespack, S.L. Machine for welding a plastic spout to a plastic package

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