JP6904253B2 - アンビル及び超音波シール装置 - Google Patents
アンビル及び超音波シール装置 Download PDFInfo
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- JP6904253B2 JP6904253B2 JP2017543241A JP2017543241A JP6904253B2 JP 6904253 B2 JP6904253 B2 JP 6904253B2 JP 2017543241 A JP2017543241 A JP 2017543241A JP 2017543241 A JP2017543241 A JP 2017543241A JP 6904253 B2 JP6904253 B2 JP 6904253B2
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- anvil
- block bodies
- surface portion
- welding
- welding surface
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Classifications
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- B65B51/10—Applying or generating heat or pressure or combinations thereof
- B65B51/22—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding
- B65B51/225—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding by ultrasonic welding
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- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
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- B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
- B29C65/745—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool
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Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Package Closures (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
例えば、レンガ型形状の容器を作製する場合、まず紙層の表裏面に熱可塑性樹脂層を有する包材に、容器用罫線を施し、包材の端部にエッジプロテクトテープを貼り、この包材を筒状に成形して当該包材端部同士を重ねて貼ることで、筒形状の包体とする。そして、この筒状包体の下端部を横断方向に接合して下端部をシール(封止)する。その後、筒状包体の中に内容物を充填した状態で容器の口となる位置を横断方向に液中シールして仕切った後、立体形状に成形することで最終形態の容器形状とする。
超音波シール装置によるシールは、容器のシール位置を、対向するホーンの先端面とアンビルの先端面とで押圧しホーンを超音波振動させることで、包材界面(重なり合うシート体同士の接触面位置)で発生する熱により包材表面に存在する熱可塑性樹脂を溶融させることで実施する。
ここで、液体容器のシールは重要であり、シールには内容物の保護、運搬・落下衝撃に耐えうる強度が必要とされる。このため、レンガ型液体用紙容器の生産においては、通常、生産開始時及び生産中に一定の生産個数ごとにシール状態の確認が行われる。その確認方法は引っ張り試験や漏れ試験などの、所謂、破壊検査である。
このようなシール位置の側方に形成された不定形な樹脂塊は、包材表面から剥がれ易く、内容物側へ脱落するおそれがある。
このとき、ホーンの振動付与面とアンビルの溶着部先端面とによる押圧及び超音波振動の付加によって、シール位置の熱可塑性樹脂は加熱及び加圧されるが、当該熱可塑性樹脂の量が過剰の場合には、シール位置の側方に所定の圧をもって押し流される。
この結果、容器の内容物側に対し樹脂塊の混入を抑制することが可能となる。
超音波シール装置1は、模式図である図1に示すように、超音波発振器9と、超音波振動子であるコンバータ2と、ホーン3と、アンビル4とを有する。符号5はジョーを示す。符号6は、ホーン3を保護するホーンカバーを示す。
コンバータ2は、超音波発振器9から電力が供給されて超音波振動を発生し、発生した振動をホーン3に伝達し、そのホーン3の先端部が超音波振動する。
本実施形態は同時に2条のシールを行う場合である。このため、ホーン3の先端部は二股に分岐しその2つの先端面で、図2に示すように、2条の振動付与面3aを形成する。各振動付与面3aは、帯状(若しくは短冊状)の形状をしており、2条の振動付与面3aは互いに平行に延在する。なお、2条の振動付与面3aは、図1及び図2では、紙面直交方向に延在している。また、2条の振動付与面3aの間には溝が形成されている。
その当接面4Aには、各振動付与面3aに向けて突出する2条の溶着面部10が形成されている。その各溶着面部10の先端面(以下、溶着押圧面10aとも呼ぶ)は、重ね合わされたシート体を挟んで、振動付与面3aと対向する。
また、帯状の溶着面部10の側方には、複数のブロック体11を有する。複数のブロック体11の列は、溶着面部10の延在方向と同方向に沿って並び、且つ隣り合うブロック体11が互いに非接触の状態となっている。
複数のブロック体11は、各溶着面部10の両側に存在していても良いが、本実施形態では、複数のブロック体11の列を、2条の溶着面部10を間に挟んだ両側に配置する場合を例示している。
また、各ブロック体11の頂面(先端の面)は、その高さが溶着面部10の高さ未満となっているか、溶着面部10の先端面と面一となるように設定されている。
各複数のブロック体11は、図3に示すように、溶着面部10の延在方向に沿って配列するように設定されている。
ここで、容器を形成する包材30(シート体)は、例えば図4に示すように、紙からなる基材層30aの表面側に外装用樹脂層30bが形成されている。また、基材層30aの裏面側には、樹脂フィルム30c、バリア層30d、及び内装用樹脂層30eがこの順に形成されている。外装用樹脂層30b、樹脂フィルム30c、内装用樹脂層30eを構成する樹脂としては、ポリエチレン樹脂を例示出来るが、これに限定されるものではない。ただし少なくとも内装用樹脂層30eは、熱可塑性樹脂から構成される。バリア層30dは、樹脂フィルム30cに蒸着した蒸着膜やアルミ薄板などから構成されて、収容する内容物に応じたバリア性を容器に担保する。
このような包材30を、内装用樹脂層30e側を内側に向けて、図5に示すように、端部同士を重ねた筒状の包体31に成形する。この筒状包体31は、長尺状の筒形状となる。ここで、上記の筒状包体31を形成する際に重ねた、包材30の端部31aと端部31bとの重なった領域を重なり部分Rと記載する。その重なり部分Rは、長尺状の筒状包体31の軸方向に沿って延びている。
ここで、少なくともシールするときには、筒状包体31は、図5(b)のように、扁平に潰された形状となっている。すなわち、図5(b)における紙面上下方向から、ホーン3とアンビル4で押圧することで、シール位置では、シート体を構成する包材30A、30Bが2層重なり合った積層体の状態となる。但し、上記の重なり部分Rでは、エッジプロテクションテープ32を含めると、シート体が4層重なり合った状態となっている。
また、上記説明では、図3のように、ブロック体11の溶着面部10からの離間距離が一様に等しい場合を例示しているがこれに限定されない。例えば、重なり部分Rでは、シールする際に発生する熱可塑性樹脂の溶融量が相対的に多くなる傾向にあるため、この位置では、図6に示すように、ブロック体11の溶着面部10からの離間距離A′を他の位置の離間距離Aに比べて広く設定することが好ましい。
間隙が0.1mm未満では、シート体間に、空気が抜けるだけの隙間が形成されがたくなり、一方間隙が2mmを超えると、溶融した樹脂が外方に移動するおそれがあるためである。
また、2条の溶着面部10の間の溝には、図1のように、断裁刃7が配置されている。断裁刃7は、ホーン3側に向けて進退可能に設けられ、2条のシール位置の間を切断して分離するために使用される。
図1は、容器下端部が封止され、内部に液体を充填されたレンガ型液体用紙容器の口(上端部)をシールすると同時に次の容器の下端部をシールする前の状態を示している。
この図1の状態から、ホーン3の振動付与面3aとアンビル4の当接面4Aとで筒状包体31を両側から所定の圧で挟み込んで、包体31を積層体の状態とし、ホーン3の振動付与面3aを超音波振動させる。これによって、内装用樹脂層30eを溶融して紙面直交方向に2条のシール位置をシールする。シールが完了したら、断裁刃7を突出させて2条のシール位置の間を分断する。これによって現在の容器の封止が完了すると共に、上側に位置する次の容器の下端部がシールされる。
このような状態で、ホーン3の振動付与面3aを超音波振動させると、振動付与面3aと溶着押圧面10aの間に位置する熱可塑性樹脂が溶融することで、振動付与面3aと溶着押圧面10aの間に位置するシール位置で積層した包体31がシール(封止)される。
このとき、振動付与面3aと溶着押圧面10aとの間に位置する熱可塑性樹脂が過剰の場合には、溶融した熱可塑性樹脂の一部がシール位置から側方に所定の圧を持って押し出される。
またこのとき、溶融した熱可塑性樹脂が所定の圧で空隙部Sに向けて流れ込むわけであるが、上記空隙部Sに存在した空気はブロック体11間の間隙から外方に抜けることで圧抜きが行われる。このため、上記空隙部Sに移動した溶融状態の熱可塑性樹脂に対する空気の混入が抑制される。すなわち、溶融樹脂塊への空気の混入による溶融樹脂塊の崩れが防止される。
このように一列に並ぶ複数のブロック体11によって、はみ出た熱可塑性樹脂による樹脂塊の厚さと幅を制御可能となる。したがって、過剰に熱可塑性樹脂が溶融された場合であっても、不定形な剥がれ易い溶融樹脂塊の形成を抑止することが出来る。
この結果、容器の内容物側に対し樹脂塊の混入を抑制することが可能となる。
また、包材30が重なり合う段差部分である上記重なり部分Rや、筒状包体31の長手方向に貼られるエッジプロテクトテープのある部分では、積層数が3層若しくは4層と多くなって、その他の位置に比べて熱可塑性樹脂の溶融量が多くなる。しかし、図6のように、離間距離を相対的に広く設定することによって、溶融した溶融樹脂塊が空隙部Sから溢れて、波打った不定形の溶融樹脂塊が形成されることを防止することが出来る。この結果、容器の内容物側に対し樹脂塊の混入を防止する効果を持つ。
また、空隙部Sの底面位置とブロック体11間の間隙とが同じ高さであるため、ブロック体11間の間隙が大き過ぎる場合には、その間隙から、空隙部Sに移動した溶融した樹脂の一部が間隙位置に入り込む可能性が大きくなる。このため、溶着面部10とブロック体11の列との間の面(空隙部Sの底面)よりもブロック体11間の間隙の高さを嵩上げしておいても良い。例えばブロック体11の高さの10%以上50%以下の範囲の嵩上げ量とする。例えば、溶着面部10とブロック体11の列との間に位置する当接面4Aに半円弧状の1条の凹部を形成することで相対的に当該溶着面部10とブロック体11の列との間を低くする。
また、本実施の形態は、本発明の技術的思想を具体化するための構成を例示するものであって、本発明の技術的思想は、構成部品の材質、形状、構造、配置等を特定するものでない。本発明の技術的思想は、特許請求の範囲に記載された請求項が規定する技術的範囲内において、種々の変更を加えることができる。
2 コンバータ
3 ホーン
3a 振動付与面
4 アンビル
4A 当接面
9 超音波発振器
10 溶着面部
10a 溶着押圧面
10b 凹部
11 ブロック体
30 包材
30A 包材
30B 包材
30a 基材層
30b 外装用樹脂層
30c 樹脂フィルム
30d バリア層
30e 内装用樹脂層
31 包体
A 離間距離
C 間隙の寸法
S 空隙部
Claims (5)
- 2以上のシート体が重ね合わされた積層体を、ホーンの先端面に形成された帯状の振動付与面とアンビルの先端面に形成された当接面とで挟み込み、上記振動付与面に伝達された超音波振動で上記シート体に設けられた熱可塑性樹脂を溶融することで当該積層体を接合する超音波シール装置における上記アンビルであって、
上記当接面には、上記ホーン側に突出し先端面が上記振動付与面と対向する帯状の溶着面部と、上記帯状の溶着面部の側方に位置して上記溶着面部の延在方向と同方向に沿って並び互いに非接触の複数のブロック体とを有し、
上記複数のブロック体が一列に並ぶ複数のブロック体であり、一列に並ぶ複数のブロック体は、上記溶着面部の延在方向と同方向に沿って並び、且つ隣り合うブロック体が互いに非接触の状態となっており、
上記複数のブロック体の高さは、上記溶着面部の高さ以下であることを特徴とするアンビル。 - 上記帯状の溶着面部が2条形成され、その2条の溶着面部を間に挟んだ両側に上記複数のブロック体の列をそれぞれ形成することを特徴とする請求項1に記載したアンビル。
- 上記溶着面部に対する上記ブロック体の離間距離は、上記シート体の積層数に応じて設定され、相対的に、上記積層数が多い位置での上記離間距離は、上記積層数が少ない位置での上記離間距離よりも広く設定されていることを特徴とする請求項1又は請求項2に記載したアンビル。
- 隣り合う上記ブロック体間の間隙は0.1mm以上2mm以下であることを特徴とする請求項1〜請求項3のいずれか1項に記載したアンビル。
- 内部に液体若しくは固形物を収容する容器の口を溶着により封止する超音波シール装置であって、
請求項1〜請求項4のいずれか1項に記載したアンビルを有することを特徴とする超音波シール装置。
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