JP4094728B2 - Method and apparatus for heating and melting thermoplastic adhesive in sealing part of liquid paper container - Google Patents

Method and apparatus for heating and melting thermoplastic adhesive in sealing part of liquid paper container Download PDF

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JP4094728B2
JP4094728B2 JP16623798A JP16623798A JP4094728B2 JP 4094728 B2 JP4094728 B2 JP 4094728B2 JP 16623798 A JP16623798 A JP 16623798A JP 16623798 A JP16623798 A JP 16623798A JP 4094728 B2 JP4094728 B2 JP 4094728B2
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hot air
paper container
liquid paper
seal
seal portion
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JPH11342549A (en
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恭一 下村
充 田島
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Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/723—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 structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—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 structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72327—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 structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of natural products or their composites, not provided for in B29C66/72321 - B29C66/72324
    • B29C66/72328—Paper
    • 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
    • B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
    • B29C65/103—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined direct heating both 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
    • B29C66/43122—Closing the top of gable top containers
    • 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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/723—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 structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—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 structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72321—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 structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8167—Quick change joining tools or surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7162—Boxes, cartons, cases
    • B29L2031/7166—Cartons of the fruit juice or milk type, i.e. containers of polygonal cross sections formed by folding blanks into a tubular body with end-closing or contents-supporting elements, e.g. gable type containers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Composite Materials (AREA)
  • Making Paper Articles (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、液体用紙容器の頂部または底部を折り畳んで加圧シールするに際し、そのシール部を熱風で炙って熱可塑性接着剤を予め加熱溶融するための方法および装置に関するものである。
【０００２】
【従来の技術】
清酒，焼酎等のアルコールやジュースその他の飲料を包装するゲーベルトップ型の液体用紙容器は、容器メーカ−においてシート素材を打ち抜くとともに折り罫を入れて紙容器の展開された形のブランクを形成し、そのブランクを筒貼りしたものを平折りにして出荷する。そして、清酒メーカー等においてその平折りの紙容器を筒状に起こし、その頂部を折り罫にて折り曲げて折りくせを付け、しかる後、底部の最終折畳み箇所のシール部を内外から高温（３００℃程度）の熱風で炙ってその部分の熱可塑性接着剤を溶融し接着可能な状態として、底部を所定の形状に折り畳み、加圧シールする。そして、内容物を充填した後、頂部の最終折畳み箇所のシール部を内外から熱風で炙ってその部分の熱可塑性接着剤を溶融し接着可能な状態として、頂部を所定の形状に折り畳み、加圧シールして内容物を密封する。
【０００３】
上記液体用紙容器のシート素材としては、ポリエチレン（ＰＥ）／紙／ＰＥ／アルミ箔／接着剤／ポリエステル（ＰＥＴ）／ＰＥからなる積層構成のものが一般的に使用されている。また、上記積層体のアルミ箔とＰＥＴとの積層構造に代えてアルミ蒸着層やシリカ蒸着層等を有するＰＥＴを用いた、ＰＥ／紙／ＰＥ／アルミ蒸着ＰＥＴ／ＰＥ、ないしはＰＥ／紙／ＰＥ／シリカ蒸着ＰＥＴ／ＰＥからなる積層構成のものも知られている。
【０００４】
アルミ箔が使用されたシート素材からなる紙容器においては、アルミ箔が第１に内容物保護としての役割を担い、第２にシール時の熱伝導層としての役割を担っている。アルミ箔は酸素ガスバリヤー性，水蒸気ガスバリヤー性および遮光性に優れるとともに内容物の保香性・保存安定性に寄与するものであり、内容物保護に有効である。また、アルミ箔は、熱の伝導性に優れるため、紙容器成形における加熱シール時の素材積層構成の安定性に寄与する。しかし、アルミ箔を使用したものは、廃棄時にアルミ箔を紙から剥がして分別回収しなければならず、廃棄物処理の面で問題がある。それに対し、アルミ蒸着ＰＥＴやシリカ蒸着ＰＥＴ等が使用されたアルミレスのシート素材からなる紙容器の場合は、アルミ蒸着層やシリカ蒸着層等を剥がして分別回収するようなことは必要でなく、廃棄物処理の面の問題は解消する。しかし、アルミ蒸着層やシリカ蒸着層等の無機物による蒸着層には、熱伝導層としての役割をアルミ箔の場合ほど期待できなくて、加熱時に紙の水分が蒸発することによるバブリングが局部的に生じて、ピンホールが発生しやすく、高温炙りによるピンホールが接着部の範囲を越えて発生し、シール抜けになるという問題がある。
【０００５】
筒貼りした紙容器は上述のように底部の最終折畳み箇所のシール部を内外から熱風で炙ってその部分の熱可塑性接着剤を接着可能な状態に溶融し、底部を所定の形状に折り畳んで加圧シールし、また、内容物を充填した後、頂部の最終折畳み箇所のシール部を内外から熱風で炙ってその部分の熱可塑性接着剤を接着可能な状態に溶融し、頂部を所定の形状に折り畳んで加圧シールするものである。そして、その底部および頂部のシール部を熱風で炙って熱可塑性接着剤を加熱溶融する工程では、筒貼りされた紙容器の底部あるいは頂部の内面側および外面側のシール部に向けて熱風を噴射するよう内外にチャンバーを配置してなる装置を使用し、この装置を紙容器の底部あるいは頂部にあてがい、内外のチャンバーに設けられた噴射孔から温度をコントロールして熱風を噴射する。ところが、このような装置を用いてチャンバーからの熱風によりシール部の熱可塑性接着剤を加熱溶融する場合、紙容器の底部あるいは頂部のコーナー部は、折り畳んで加圧したときにシール不良を起こさないよう特に熱量を十分に行き渡らせて接着力を高める必要があるにも拘わらず、そのコーナー部には内側のチャンバーからの熱風が当たりにくいという問題がある。特公平３−２５４６３号公報に記載されたものでは、こうした問題を解決するため、噴射孔の数やピッチを変えたり口径を変えることにより紙容器の頂部あるいは底部のコーナー部（屈曲部）の内面側に向けて噴射する熱風の量を他の部分へ噴射する熱風の量よりも多くなるようにしている。
【０００６】
【発明が解決しようとする課題】
液体用紙容器の頂部または底部を折り畳み加圧シールするに際しそのシール部を熱風で炙って熱可塑性接着剤を予め加熱溶融するについては、一般には熱風の温度を３００℃程度の高温炙りにしないと熱可塑性接着剤が溶融せず十分な接着性が得られない。そして、ＰＥ／紙／ＰＥ／アルミ箔／接着剤／ＰＥＴ／ＰＥの積層構成のシート素材からなる液体用紙容器の場合は、アルミ箔が熱伝導層として寄与し加熱時の安定性が良いため、高温炙りを行ってもピンホール（熱ピンホール）の発生の問題は生じない。しかし、アルミ箔を用いる代わりにアルミ蒸着ＰＥＴやシリカ蒸着ＰＥＴ等の無機物蒸着層を使用したアルミレスのシート素材からなる紙容器の場合は、上述のように高温炙りによって局部的なバブリングが生じ、熱ピンホールが発生して、それが液洩れの要因となる。
【０００７】
したがって、液体用紙容器の頂部または底部を折り畳んで加圧シールするためシール部を熱風で炙って熱可塑性接着剤を溶融する時に発生するピンホールが液洩れの要因にならないようにすることが課題である。
【０００８】
【課題を解決するための手段】
本発明による方法は、液体用紙容器の頂部または底部を折り畳み加圧シールするに際しそのシール部を熱風で炙って熱可塑性接着剤を予め加熱溶融する方法であって、液体用紙容器の頂部または底部のシール部に向けて熱風を噴射するとともに、液体用紙容器の頂部または底部の内面側のシール部の内容物収納部側近傍に所定の拡張炙り部を設定し、該拡張炙り部に向け、内面側のシール部に向けて噴射する熱風の速度よりも遅い速度で熱風を噴射して、シール部に対するよりも少ない熱量で拡張炙り部の熱可塑性接着剤を溶融させ、シール部の内容物収納部側にピンホールの発生しない拡張シール部を形成しシール部内に熱ピンホールを留めて加圧シールできる状態とすることを特徴とする。この方法によれば、液体用紙容器の頂部または底部の内面側では、炙り部が本来のシール部を越えて内容物収納部側にはみ出した形で設定され、その内容物収納部側にはみ出した部分である拡張炙り部に対しては本来のシール部に対するよりも遅い速度で熱風が噴射される。そのため、容器内面側の本来のシール部に対しては高温炙りにより十分な熱量を供給しつつ、その本来のシール部より内容物収納部側に、熱量が少ないためにピンホールの発生しない拡張シール部を形成することができ、その結果、容器内面側では炙りによる熱ピンホールを完全にシール部内に留め、熱ピンホールが液洩れの要因にならないようにできる。
【０００９】
この方法において、拡張炙り部に向けて噴射する熱風は、内面側のシール部に向けて噴射する熱風の速度の略半分の速度で噴射するのがよく、そうすることで本来のシール部におけるシール性を確保しつつ拡張シール部における熱ピンホールの発生を防止することができる。
【００１０】
また、この方法は、拡張炙り部を液体用紙容器の頂部または底部のコーナー部近傍に設定し、該コーナー部の内面側のシール部に向けて噴射する熱風の量を該シール部の他の部分に噴射する熱風の量よりも多くするのがよい。そうすることにより、コーナー部に熱量を十分行き渡らせて、折り畳んで加圧したときのコーナー部のシール不良を防止しつつ、そのコーナー部の内面に発生する熱ピンホールをシール部内に留めることができる。
【００１１】
この方法は、液体用紙容器のシート素材が、紙層を基材層とし無機物の蒸着層を有するプラスチック層を中間層とし熱可塑性接着剤層を内層および外層とする積層体である場合に好適で、その場合、アルミ蒸着ＰＥＴやシリカ蒸着ＰＥＴ等を使用したアルミレスのシート素材からなる紙容器の高温炙りによる熱ピンホールが液洩れの要因となるのを防止できる。
【００１２】
また、本発明による装置は、液体用紙容器の頂部または底部を折り畳んで加圧シールするに際しそのシール部を熱風で炙って熱可塑性接着剤を予め加熱溶融する装置であって、液体用紙容器の頂部または底部の端縁の内面に臨んで設置される熱風噴射用のチャンバーを備え、該チャンバーが、熱風が供給される熱風室と、該熱風室に供給された熱風を液体用紙容器の頂部または底部の端縁のシール部に向けて噴射する多数の噴射孔とを有するとともに、熱風室に連通穴を介して連通し熱風室から熱風が供給される小熱風室と、該小熱風室に供給された熱風を液体用紙容器の頂部または底部の内面側のシール部の内容物収納部側近傍に設定した所定の拡張炙り部に向けてシール部に向けて熱風を噴射する噴射孔からの熱風の速度よりも遅い速度で噴射する噴射孔とを有することを特徴とする。この装置によれば、チャンバーが液体用紙容器の頂部または底部の端縁の内面に臨んで設置され、該チャンバーのシール部に向けて熱風を噴射する噴射孔から液体用紙容器の頂部または底部の端縁の内面側のシール部に向けて熱風が噴射されるとともに、その内面側の本来の接着部を越えて内容物収納部側にはみ出した形の拡張炙り部に向けて、シール部に向けて熱風を噴射する噴射孔からの熱風の速度よりも遅い速度で拡張炙り部に向けて熱風を噴射する噴射孔から熱風が噴射される。そのため、容器内面側の本来のシール部に対しては高温炙りにより十分な熱量を供給しつつ、その本来のシール部より内容物収納部側に、熱量が少ないためにピンホールの発生しない拡張シール部を形成することができ、結果として、容器内面側では炙りによる熱ピンホールを完全に接着部内に留め、熱ピンホールが液洩れの要因にならないようにできる。
【００１３】
この装置は、拡張炙り部に向けて噴射する熱風を、内面側のシール部に向けて噴射する熱風の速度の略半分の速度で噴射するようにするのがよく、そうすることで本来のシール部における接着性を確保しつつ拡張シール部における熱ピンホールの発生を防止することができる。
【００１４】
また、この装置は、液体用紙容器の頂部または底部の各コーナー部の内面側のシール部に向けて噴射する熱風の量が該シール部の他の部分に噴射する熱風の量よりも多くなるよう、シール部に向けて熱風を噴射する噴射孔が配置されるとともに、該コーナー部近傍に拡張炙り部が設定されたものにおいて特に有利であり、その場合に、コーナー部に熱量を十分行き渡らせて、折り畳んで加圧したときのコーナー部のシール不良を防止しつつ、そのコーナー部の内面に発生する熱ピンホールをシール部内に留めることができる。
【００１５】
また、この装置のチャンバーは、断面多角形の短筒状で内部に前記熱風室を有し側壁部に前記シール部に向けて熱風を噴射する噴射孔を有するとともに端部に前記熱風室につながる連通穴を有するチャンバー本体と該チャンバー本体の端部に配置されたスペーサーと該スペーサーを介して取り付けられたプレートからなり、前記連通穴は、チャンバー本体の液体用紙容器の頂部または底部の各コーナー部に対応する位置にそれぞれ設けられ、スペーサーにより、チャンバー本体とプレートとの間に連通穴に連通するよう前記小熱風室が形成されるとともに、コーナー部近傍に設定された拡張炙り部に向けて熱風を噴射するよう前記拡張炙り部に向けて熱風を噴射する噴射孔と、小熱風室と前記拡張炙り部に向けて熱風を噴射する噴射孔とを連通する連通路が形成されたものとするのがよい。そうした場合、熱風室に供給される熱風が、シール部に向けて熱風を噴射する噴射孔から液体用紙容器の頂部または底部の端縁のシール部に向けて噴射されるとともに、そのシール部に向けて熱風を噴射する噴射孔から噴射される熱風と略同じ速度で熱風が連通穴から小熱風室に流れ、その熱風が連通路を流れて拡張炙り部に向けて熱風を噴射する噴射孔から拡張炙り部に向けて、シール部に向けて熱風を噴射する噴射孔からの熱風よりも遅い速度で噴射される。
【００１６】
拡張炙り部に向けて熱風を噴射する噴射孔から噴射される熱風の速度が噴射孔から噴射される熱風の速度よりも遅い速度となるようにするためには、拡張炙り部に向けて熱風を噴射する噴射孔の開口面積を連通穴の開口面積より大きいものとするのがよい。そして、特に、拡張炙り部に向けて熱風を噴射する噴射孔の開口面積を連通穴の開口面積の略２倍とすることにより、拡張炙り部に向けて噴射する熱風の速度をシール部に向けて噴射する熱風の速度の略半分の速度として、シール部における接着性を確保しつつ拡張シール部における熱ピンホールの発生を防止するようにできる。
【００１７】
この装置は、液体用紙容器のシート素材が、紙層を基材層とし無機物の蒸着層を有するプラスチック層を中間層とし熱可塑性接着剤層を内層および外層とする積層体である場合に好適で、その場合に、アルミ蒸着ＰＥＴやシリカ蒸着ＰＥＴ等を使用したアルミレスのシート素材からなる紙容器の高温炙りによる熱ピンホールが液洩れの要因となるのを防止できる。
【００１８】
【発明の実施の形態】
以下、図面に基づいて本発明の実施の形態を説明する。
【００１９】
図１に示すゲーベルトップ型の紙容器１０は、本発明の実施の形態の一例に係る例えば焼酎を内容物とする液体用紙容器である。この紙容器１０は、紙層を基材層とした積層構成のシート素材Ｓ（図２参照）からなるブランクＢ（図３，図４参照）を筒貼りし、底部１１および頂部１２を所定の形状に折り畳んで加圧シールすることにより形成されるものである。
【００２０】
上記紙容器１０のシート素材Ｓは、例えば、ＰＥ／紙／ＰＥ／アルミ蒸着ＰＥＴ／ＰＥや、ＰＥ／紙／ＰＥ／シリカ蒸着ＰＥＴ／ＰＥからなる積層構成のものである。
【００２１】
図２はシート素材Ｓの一例の積層構成を示すものであって、１は紙層、２はアルミ蒸着層２ａとポリエステル（ＰＥＴ）層２ｂからなるアルミ蒸着ＰＥＴ層、３，４および５はポリエチレン（ＰＥ）層をそれぞれ表す。
【００２２】
上記シート素材Ｓは、紙容器１０の展開された形に打ち抜かれるとともに所定の折り罫が入れられ、図３および図４に示すブランクＢが形成される。ブランクＢは、紙層１の側が表面（容器外面側）で、アルミ蒸着ＰＥＴ層２の側が裏面（容器内面側）である。
【００２３】
紙容器１０は、ブランクＢを筒貼りした状態で平折りにして保管・移送される。そして、内容物充填時にその平折りの紙容器１０が筒状に起こされ、底部１１および頂部の最終折畳み箇所が折り罫にて折り曲げられ、折りくせが付けられた後、紙容器１０の底部１１が折り畳まれて加圧シールされ、次いで、内容物が充填され、最後に、頂部１２が折り畳まれて加圧シールされる。
【００２４】
上記紙容器１０の底部１１および頂部１２は、最終折畳み箇所の内面側および外面側のシール部が加圧シール時に予め熱風で炙られ、上記ＰＥ層３，４のＰＥ（熱可塑性接着剤）が接着可能な状態まで加熱溶融される。そして、その底部１１の加熱溶融には、図５に示すように紙容器１０の底部１１の端縁の内面に臨んで設置される内面炙り用のセンターチャンバー２１と、底部１１の外面に臨んで設置される外面炙り用のアウターチャンバー２２，２３，２４，２５とを備えた底部炙り装置が用いられ、頂部１２の加熱溶融には、図６に示すように紙容器１０の頂部１２の端縁の内面に臨んで設置される内面炙り用のセンターチャンバー３１と、頂部１２の端縁の外面に臨んで設置される外面炙り用のアウターチャンバー３２，３３とを備えた頂部炙り装置が用いられる。これら底部炙り装置および頂部炙り装置の各チャンバー２１〜２５，３１〜３３は、外部から熱風が供給される熱風室を構成するとともに、その熱風室に供給された熱風を紙容器１０の底部１１または頂部１２のシール部に向けて噴射する多数の噴射孔を有するものである。そして、センタータチャンバー２１，３１の噴射孔については、紙容器１０の底部１１および頂部１２の各コーナー部の内面側のシール部に向けて噴射する熱風の量が該シール部の他の部分に噴射する熱風の量よりも多くなるよう口径，ピッチあるいは孔数を変えた設定とされている。
【００２５】
上記底部炙り装置および上記頂部炙り装置は、各チャンバー２１〜２５，３１〜３３が紙容器１０の底部１１あるいは頂部１２のシール部に臨んで所定の間隙を保った状態で紙容器１０の底部１１あるいは頂部１２のシール部に設定した炙り部に向け噴射孔から熱風を噴射するよう設置するものである。
【００２６】
また、頂部炙り装置のセンターチャンバー３１は、紙容器１０の頂部１２の内面側のシール部の内容物収納側に設定した拡張炙り部に向けて本来のシール部に対する熱風の速度よりも遅い速度で熱風を噴射するものであって、図７に示すように、熱風が供給される熱風室４１と、該熱風室４１に供給された熱風をシール部に向けて噴射するよう所定の配置で設けられた多数の噴射孔４２と、各連通穴４３を介して上記熱風室４１に連通するよう先端側に設けられた複数の小熱風室４４と、各小熱風室４４に供給された熱風を上記拡張炙り部に向けて噴射する複数の噴射窓４５（拡張炙り部に向けて熱風を噴射する噴射孔）と、各コーナー部において小熱風室４４を噴射窓４５に連通する連通路４６とを備えている。各噴射窓４５は、噴射窓４５から噴射される熱風の速度が噴射孔４２からの熱風の速度の約半分の速度となるよう、連通穴４３の開口面積の約２倍の開口面積に設定されたものである。
【００２７】
図３および図４における斜線領域が、紙容器１０の底部１１および頂部１２における内面側および外面側の炙り部ａ，ｂ，ｃ，ｄである。これら内面側および外面側の炙り部ａ，ｂ，ｃ，ｄは、紙容器１０の底部１１または頂部１２の最終折畳み箇所のシール部に略一致する設定とされ、かつ、頂部１２の内面側のシール部に対しては、本来のシール部の内容物収納部側に拡張炙り部ａ1が設定されたものである。そして、その拡張炙り部ａ1は紙容器１０の各コーナー部近傍で大きく張り出したものとされている。
【００２８】
上記頂部炙り装置のセンターチャンバー３１は例えば図８および図９に示すとおりであって、紙容器１０の頂部１２のくせ折りした状態の形状に合わせた断面多角形の短筒状で、外部の熱風源に連通する入口開口（図示せず）を有する上端部の端縁に取付けフランジ部を有し内部に熱風室４１を有し側壁部に噴射孔４２を有するとともに下端に熱風室４１につながる連通穴４３を有するチャンバー本体５１と、該チャンバー本体５１の下端に配置されたスペーサー５２と、該スペーサー５２を介してボルト５３とナット５４でチャンバー本体５１に固定されたプレート５５からなっている。上記連通穴４３は、紙容器１０の頂部１２の各コーナー部に対応して４個設けられている。そして、スペーサー５２によりチャンバー本体５１とプレート５５との間に各連通穴４３にそれぞれ連通する４個の小熱風室４４が形成されるとともに各コーナー部近傍に向けて熱風を噴射する噴射窓４５が形成され、また、各コーナー部における小熱風室４４と噴射窓４５とを連通する連通路４６が形成されている。
【００２９】
上記センターチャンバー３１を有する頂部炙り装置を用いて紙容器１０の頂部１２の加熱溶融を行うことにより、紙容器１０の頂部１２の内面側では、本来のシール部を越えて内容物収納部側にはみ出した拡張炙り部ａ1まで熱風が噴射され、かつ、その拡張炙り部ａ1に対しては本来のシール部に設定する炙り部ａに対するよりも遅い速度で熱風が噴射される。そのため、本来のシール部に対しては高温炙りにより十分な熱量を供給しつつ、その本来のシール部より内容物収納部側にピンホールの発生しない拡張接着部を形成することができ、結果として、容器内面側では炙りによる熱ピンホールを完全にシール部内に留め、熱ピンホールが液洩れの要因にならないようにできる。そして、特に紙容器１０の頂部１２のコーナー部の内面側に熱量を十分行き渡らせることができ、折り畳んで加圧したときの該コーナー部のシール不良を防止しつつ、そのコーナー部の内面に発生する熱ピンホールをシール部内に留めるようにできる。
【００３０】
上記の例は、頂部１２の内面側のシール部に対して、本来のシール部の内容物収納部側に拡張炙り部ａ1を設定し、かつ、その拡張炙り部ａ1を紙容器１０の各コーナー部近傍で大きく張り出したものとしたものであるが、底部１１についても同様に内面側のシール部に対して、紙容器１０の各コーナー部近傍で大きく張り出す形で本来のシール部の内容物収納部側に拡張炙り部を設定することもできる。その場合の底部炙り装置のセンターンチャンバー２１は例えば図１０および図１１に示すとおりであって、紙容器１０の底部１１の形状に合わせた断面多角形の短筒状で、外部の熱風源に連通する入口開口（図示せず）を有する下端部の端縁に取付けフランジ部を有し内部に熱風室（図示せず）を有し側壁部に噴射孔１４２を有するとともに下端に熱風室につながる連通穴１４３を有するチャンバー本体１５１と、該チャンバー本体１５１の上端に配置されたスペーサー１５２と、該スペーサー１５２を介してボルト１５３とナット１５４でチャンバー本体１５１に固定されたプレート１５５からなっている。上記連通穴１４３は、紙容器１０の底部１１の各コーナー部に対応して４個設けられている。そして、スペーサー１５２によりチャンバー本体１５１とプレート１５５との間に各連通穴１４３にそれぞれ連通する４個の小熱風室１４４が形成されるとともに各コーナー部近傍に向けて熱風を噴射する噴射窓１４５（拡張炙り部に向けて熱風を噴射する噴射孔）が形成され、また、各コーナー部における小熱風室１４４と噴射窓１４５とを連通する連通路１４６が形成されたものとなる。各噴射窓１４５は、噴射窓１４５から噴射される熱風の速度が噴射孔１４２からの熱風の速度の約半分の速度となるよう、連通穴１４３の開口面積の約２倍の開口面積に設定される。
【００３１】
このような構成のセンターンチャンバー２１を設けた底部炙り装置を用いて紙容器１０の底部１１の加熱溶融を行うことにより、紙容器１０の底部１１の内面側において本来のシール部を越えて内容物収納部側にはみ出した拡張炙り部まで熱風を噴射し、かつ、その拡張炙り部に対しては本来のシール部に設定する炙り部に対するよりも遅い速度で熱風を噴射して、本来のシール部に対しては高温炙りにより十分な熱量を供給しつつ、その本来のシール部より内容物収納部側にピンホールの発生しない拡張シール部を形成することができ、やはり、容器内面側で炙りによる熱ピンホールを完全にシール部内に留め、特に紙容器１０の底部１１のコーナー部の内面側に熱量を十分行き渡らせて該コーナー部のシール不良を防止しつつ、そのコーナー部の内面に発生する熱ピンホールをシール部内に留めるようにできる。
【００３２】
なお、上記の例は、連通穴を介してチャンバー本体の熱風室に連通する小熱風室を設けて噴射窓に熱風を送るようにしたものであるが、この小熱風室は、チャンバー本体の熱風室とは別系統で熱風を供給するものとしてもよい。
【００３３】
また、上記紙容器のシート素材としては、ＰＥ／紙／ＰＥ／アルミ蒸着ＰＥＴ／ＰＥ、ＰＥ／紙／ＰＥ／シリカ蒸着ＰＥＴ／ＰＥのほかにも様々な積層構成のものを使用できる。特に、蒸着層としては、上記のものが一般的に用いられるが、これに限られることはなく、他の例えば酸化アルミニウムや酸化インジウム，酸化錫等の無機物の蒸着層としてもよく、また、それらの混合物や複数層に構成されたものであっても構わない。
【００３４】
また、本発明を適用する紙容器は、焼酎を初め、他の清酒等のアルコールや、ジュースその他の飲料等の様々な液体を内容物とする紙容器であってよいものである。
【００３５】
【発明の効果】
本発明によれば、液体用紙容器の頂部または底部を折り畳んで加圧シールするためシール部を熱風で炙って熱可塑性接着剤を溶融する時に発生するピンホールをシール部内に留めてシール性を向上させるようにできる。
【図面の簡単な説明】
【図１】本発明の実施の形態に係る液体用紙容器の斜視図である。
【図２】本発明の実施の形態に係る液体用紙容器のシート素材の積層構成の説明図である。
【図３】本発明の実施の形態に係る液体用紙容器のブランクの内面図である。
【図４】本発明の実施の形態に係る液体用紙容器のブランクの外面図である。
【図５】本発明の実施の形態に係る液体用紙容器の底部のシール部の加熱溶融におけるチャンバーの配置を平面視にて示す説明図である。
【図６】本発明の実施の形態に係る液体用紙容器の頂部のシール部の加熱溶融におけるチャンバーの配置を平面視にて示す説明図である。
【図７】本発明の実施の形態に係る液体用紙容器の頂部のシール部の加熱溶融におけるチャンバーの配置を垂直断面で示す説明図である。
【図８】本発明の実施の形態に係る液体用紙容器の頂部のシール部の加熱溶融に使用するセンターチャンバーの斜視図である。
【図９】本発明の実施の形態に係る液体用紙容器の頂部のシール部の加熱溶融に使用するセンターチャンバーの分解図である。
【図１０】液体用紙容器の底部のシール部の加熱溶融に使用するセンターチャンバーの一例の斜視図である。
【図１１】液体用紙容器の底部のシール部の加熱溶融に使用するセンターチャンバーの一例の分解図である。
【符号の説明】
１０ 紙容器
１１ 底部
１２ 頂部
２１，３１ センターチャンバー
４１ 熱風室
４２，１４２ 噴射孔
４３，１４３ 連通穴
４４，１４４ 小熱風室
４５，１４５ 噴射窓
４６，１４６ 連通路
５１，１５１ チャンバー本体
５２，１５２ スペーサー
５５，１５５ プレート
ａ，ｂ，ｃ，ｄ 炙り部
ａ1 拡張炙り部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for preliminarily heating and melting a thermoplastic adhesive by squeezing a seal portion with hot air when the top or bottom of a liquid paper container is folded and pressure-sealed.
[0002]
[Prior art]
Gobeltop-type liquid paper containers that package alcohol, juice, and other beverages such as sake, shochu, etc., are punched out of sheet material at container manufacturers and creased to form blanks in the form of expanded paper containers. The blank with the cylinder attached is folded flat and shipped. Then, in the sake maker, etc., the flat folded paper container is raised in a cylindrical shape, and the top part is bent by a crease, and then the seal part of the final folding part at the bottom is heated from the inside to the outside (300 ° C.). The bottom portion is folded into a predetermined shape and sealed with pressure, so that the portion of the thermoplastic adhesive is melted and bonded with hot air. Then, after filling the contents, squeeze the seal part of the final folding part of the top part with hot air from inside and outside to melt the thermoplastic adhesive of that part, and fold the top part into a predetermined shape, pressurize Seal and seal the contents.
[0003]
As the sheet material of the liquid paper container, a laminated material composed of polyethylene (PE) / paper / PE / aluminum foil / adhesive / polyester (PET) / PE is generally used. In addition, PE / paper / PE / aluminum vapor-deposited PET / PE or PE / paper / PE using PET having an aluminum vapor-deposited layer, a silica vapor-deposited layer or the like instead of the laminated structure of the aluminum foil and PET of the laminate. Also known is a layered structure composed of / silica-deposited PET / PE.
[0004]
In a paper container made of a sheet material in which an aluminum foil is used, the aluminum foil firstly plays a role as content protection, and secondly plays a role as a heat conduction layer at the time of sealing. Aluminum foil is excellent in oxygen gas barrier properties, water vapor gas barrier properties and light shielding properties, and contributes to the fragrance retention and storage stability of the contents, and is effective in protecting the contents. Moreover, since aluminum foil is excellent in heat conductivity, it contributes to the stability of the material lamination structure at the time of heat sealing in paper container molding. However, those using aluminum foil have a problem in terms of waste disposal because the aluminum foil must be peeled off from the paper at the time of disposal and collected separately. On the other hand, in the case of a paper container made of an aluminum-less sheet material in which aluminum-deposited PET or silica-deposited PET is used, it is not necessary to separate and collect the aluminum-deposited layer, silica-deposited layer, etc. The problem of waste disposal is solved. However, inorganic vapor deposition layers such as aluminum vapor deposition layers and silica vapor deposition layers cannot be expected to play a role as a heat conduction layer as in the case of aluminum foil, and bubbling due to the evaporation of paper moisture during heating is localized. As a result, pinholes are likely to be generated, and pinholes due to high-temperature erosion occur beyond the range of the bonded portion, resulting in a seal failure.
[0005]
As described above, the paper container with the tube attached is melted in a state in which the seal portion of the final folding portion of the bottom portion is scrubbed with hot air from inside and outside so that the thermoplastic adhesive of the portion can be bonded, and the bottom portion is folded into a predetermined shape and added. After sealing with pressure and filling the contents, the seal part of the final folding part of the top part is blown with hot air from inside and outside to melt the thermoplastic adhesive of that part so that it can be bonded, and the top part has a predetermined shape. It is folded and pressure sealed. Then, in the step of heating and melting the thermoplastic adhesive by scrubbing the bottom and top seals with hot air, hot air is sprayed toward the inner and outer seals of the bottom or top of the paper-bonded paper container. A device in which a chamber is arranged inside and outside is used, and this device is applied to the bottom or top of a paper container, and hot air is jetted by controlling the temperature from the jet holes provided in the inside and outside chambers. However, when the thermoplastic adhesive of the seal part is heated and melted with hot air from the chamber using such an apparatus, the bottom or top corner of the paper container does not cause a seal failure when folded and pressurized. In particular, although it is necessary to increase the adhesive force by spreading the amount of heat sufficiently, there is a problem that the hot air from the inner chamber is difficult to hit the corner portion. Japanese Patent Publication No. 3-25463 discloses an inner surface of a corner portion (bent portion) at the top or bottom of a paper container by changing the number and pitch of the injection holes or changing the diameter in order to solve such problems. The amount of hot air jetted toward the side is made larger than the amount of hot air jetted to other portions.
[0006]
[Problems to be solved by the invention]
When the top or bottom of a liquid paper container is folded and pressure-sealed, the sealing portion is blown with hot air to heat and melt the thermoplastic adhesive in advance. Generally, the temperature of the hot air must be increased to about 300 ° C. The plastic adhesive does not melt and sufficient adhesion cannot be obtained. And in the case of a liquid paper container made of a sheet material having a laminated structure of PE / paper / PE / aluminum foil / adhesive / PET / PE, the aluminum foil contributes as a heat conductive layer and has good stability during heating. There is no problem of generating pinholes (heat pinholes) even if high-temperature rolling is performed. However, in the case of a paper container made of an aluminum-less sheet material using an inorganic deposition layer such as aluminum-deposited PET or silica-deposited PET instead of using an aluminum foil, local bubbling occurs due to high-temperature rolling as described above. A thermal pinhole is generated, which causes liquid leakage.
[0007]
Therefore, the top or bottom of the liquid paper container is folded and pressure-sealed so that the pinhole generated when the thermoplastic adhesive is melted by scrubbing the seal with hot air is not a cause of liquid leakage. is there.
[0008]
[Means for Solving the Problems]
The method according to the present invention is a method in which the top or bottom of a liquid paper container is folded and pressure-sealed, and the sealing part is scrubbed with hot air to preheat and melt the thermoplastic adhesive. A hot air is sprayed toward the seal portion, and a predetermined extended flange portion is set in the vicinity of the content storage portion side of the seal portion on the inner surface side of the top or bottom of the liquid paper container, and the inner surface side toward the expanded flange portion Hot air is jetted at a speed slower than the speed of hot air jetted toward the seal part Then, the thermoplastic adhesive of the expansion flange portion is melted with a smaller amount of heat than that for the seal portion, and an expansion seal portion that does not generate a pinhole is formed on the content storage portion side of the seal portion, and a hot pinhole is formed in the seal portion. It can be fastened and sealed with pressure It is characterized by doing. According to this method, on the inner side of the top or bottom of the liquid paper container, the curled portion is set so as to protrude beyond the original seal portion to the content storage portion side, and protrudes to the content storage portion side. Hot air is sprayed at a slower speed than the original seal portion to the expanded expansion portion which is a portion. Therefore, an expansion seal that does not generate pinholes because it supplies a sufficient amount of heat to the original seal part on the inner surface side of the container due to high-temperature squeezing and the amount of heat from the original seal part to the content storage part side is small. As a result, the heat pinhole due to the sag is completely retained in the seal portion on the inner surface side of the container, and the heat pinhole can be prevented from causing liquid leakage.
[0009]
In this method, the hot air to be injected toward the expansion ring portion is preferably injected at a speed approximately half the speed of the hot air to be injected toward the seal portion on the inner surface side. Generation of thermal pinholes in the expansion seal portion can be prevented while securing the properties.
[0010]
Further, in this method, the expansion ring portion is set near the corner portion of the top or bottom of the liquid paper container, and the amount of hot air sprayed toward the seal portion on the inner surface side of the corner portion is set to the other portion of the seal portion. It is better to make it larger than the amount of hot air to be sprayed on. By doing so, it is possible to keep the heat pin hole generated in the inner surface of the corner part in the seal part while spreading the heat amount enough to the corner part and preventing the poor seal of the corner part when it is folded and pressed. it can.
[0011]
This method is suitable when the sheet material of the liquid paper container is a laminate in which a paper layer is a base layer, a plastic layer having an inorganic vapor deposition layer is an intermediate layer, and a thermoplastic adhesive layer is an inner layer and an outer layer. In that case, it is possible to prevent a thermal pinhole caused by high-temperature rolling of a paper container made of an aluminum-less sheet material using aluminum-deposited PET, silica-deposited PET, or the like from causing a liquid leak.
[0012]
The apparatus according to the present invention is an apparatus for pre-heating and melting a thermoplastic adhesive by folding the top or bottom of a liquid paper container and pressurizing and sealing it with hot air. Or a hot air jet chamber installed facing the inner surface of the edge of the bottom, the chamber being supplied with hot air, and the hot air supplied to the hot air chamber at the top or bottom of the liquid paper container A number of injection holes for injecting toward the seal portion of the edge of the From the hot air chamber to the hot air chamber through the communication hole A small hot air chamber to which hot air is supplied, and the hot air supplied to the small hot air chamber toward a predetermined expansion portion set in the vicinity of the content storage portion side of the seal portion on the inner side of the top or bottom of the liquid paper container The Inject hot air toward the seal Inject at a speed slower than the speed of hot air from the injection hole Injection hole It is characterized by having. According to this apparatus, the chamber is installed facing the inner surface of the top edge or bottom edge of the liquid paper container, Injection hole for injecting hot air toward the seal From the top of the liquid paper container toward the seal part on the inner surface side of the edge of the top and bottom, and the expansion of the shape that protrudes beyond the original adhesive part on the inner surface side to the contents storage part side To the department Injection hole for injecting hot air toward the seal At a speed slower than the speed of hot air from Injection hole for injecting hot air toward the expansion head Hot air is jetted from. Therefore, an expansion seal that does not generate pinholes because it supplies a sufficient amount of heat to the original seal part on the inner surface side of the container due to high-temperature squeezing and the amount of heat from the original seal part to the content storage part side is small. As a result, the heat pinhole caused by the sag is completely retained in the bonded portion on the inner surface side of the container, and the heat pinhole can be prevented from causing liquid leakage.
[0013]
In this device, it is preferable to inject hot air to be injected toward the expansion ring portion at a speed that is approximately half the speed of the hot air to be injected toward the seal portion on the inner surface side. It is possible to prevent the occurrence of thermal pinholes in the expansion seal part while ensuring the adhesiveness in the part.
[0014]
Further, in this apparatus, the amount of hot air sprayed toward the seal portion on the inner surface side of each corner portion at the top or bottom of the liquid paper container is larger than the amount of hot air sprayed onto other portions of the seal portion. Inject hot air toward the seal This is particularly advantageous in the case where the injection hole is arranged and the extended punching portion is set in the vicinity of the corner portion. In this case, the corner portion when the corner portion is sufficiently pressed with heat spread over the corner portion. Thus, the heat pin hole generated on the inner surface of the corner portion can be retained in the seal portion.
[0015]
Moreover, the chamber of this apparatus is a short cylinder with a polygonal cross section and has the hot air chamber inside, and a side wall portion. Hot air is sprayed toward the seal part It comprises a chamber body having an injection hole and a communicating hole connected to the hot air chamber at the end, a spacer disposed at the end of the chamber body, and a plate attached via the spacer, The communication hole is formed on the chamber body. Corresponds to each corner of the top or bottom of the liquid paper container In the position to Each provided by a spacer , Communicate with the communication hole between the chamber body and the plate Like Small hot air chamber Is formed, Near the corner Extended punching section set to Inject hot air toward An injection hole for injecting hot air toward the expanded blow part, Small hot air chamber and the above Injection hole for injecting hot air toward the expansion head It is preferable that a communication path that communicates with each other is formed. In such a case, the hot air supplied to the hot air chamber is Injection hole for injecting hot air toward the seal From the top of the liquid paper container toward the seal at the edge of the bottom. Inject hot air toward the seal Hot air flows from the communication hole to the small hot air chamber at approximately the same speed as the hot air injected from the injection hole, and the hot air flows through the communication passage. Injection hole for injecting hot air toward the expansion head From to the expansion section, Inject hot air toward the seal Injected at a slower speed than the hot air from the injection hole.
[0016]
Injection hole for injecting hot air toward the expansion head In order to make the speed of the hot air jetted from the jet air slower than the speed of the hot air jetted from the jet hole, Injection hole for injecting hot air toward the expansion head It is preferable that the opening area is larger than the opening area of the communication hole. And in particular, Injection hole for injecting hot air toward the expansion head By making the opening area of the air hole approximately twice as large as the opening area of the communication hole, the speed of the hot air sprayed toward the expansion ring portion is set to be approximately half the speed of the hot air sprayed toward the seal portion. Generation of thermal pinholes in the expansion seal portion can be prevented while ensuring adhesiveness.
[0017]
This apparatus is suitable when the sheet material of the liquid paper container is a laminate in which a paper layer is a base layer, a plastic layer having an inorganic vapor deposition layer is an intermediate layer, and a thermoplastic adhesive layer is an inner layer and an outer layer. In this case, it is possible to prevent a thermal pinhole caused by high-temperature rolling of a paper container made of an aluminum-less sheet material using aluminum-deposited PET, silica-deposited PET, or the like from causing leakage.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
1 is a liquid paper container containing, for example, shochu as a content according to an example of an embodiment of the present invention. In this paper container 10, blank B (see FIGS. 3 and 4) made of a sheet material S (see FIG. 2) having a laminated structure in which a paper layer is a base material layer is attached in a cylinder, and a bottom 11 and a top 12 are formed in a predetermined manner. It is formed by folding into a shape and sealing with pressure.
[0020]
The sheet material S of the paper container 10 has, for example, a laminated structure composed of PE / paper / PE / aluminum-deposited PET / PE and PE / paper / PE / silica-deposited PET / PE.
[0021]
FIG. 2 shows an example of the laminated structure of the sheet material S, where 1 is a paper layer, 2 is an aluminum vapor-deposited PET layer comprising an aluminum vapor-deposited layer 2a and a polyester (PET) layer 2b, and 3, 4 and 5 are polyethylene. Each represents a (PE) layer.
[0022]
The sheet material S is punched into a developed shape of the paper container 10 and has a predetermined crease, so that a blank B shown in FIGS. 3 and 4 is formed. In the blank B, the paper layer 1 side is the front surface (container outer surface side), and the aluminum vapor deposited PET layer 2 side is the back surface (container inner surface side).
[0023]
The paper container 10 is stored and transported in a flat-folded state with the blank B being attached in a cylinder. Then, when the contents are filled, the flat folded paper container 10 is raised in a cylindrical shape, and the bottom 11 and the final folded portion of the top are folded by a crease and creased, and then the bottom 11 of the paper container 10 is placed. Is folded and pressure sealed, then filled with contents, and finally the top 12 is folded and pressure sealed.
[0024]
The bottom portion 11 and the top portion 12 of the paper container 10 are preliminarily blown with hot air at the time of pressure sealing the inner and outer seal portions of the final folding location, and the PE (thermoplastic adhesive) of the PE layers 3 and 4 is It is heated and melted until it can be bonded. Then, in the heat melting of the bottom portion 11, as shown in FIG. 5, the center chamber 21 for turning the inner surface facing the inner surface of the edge of the bottom portion 11 of the paper container 10 and the outer surface of the bottom portion 11 are faced. A bottom turning device provided with outer chambers 22, 23, 24, and 25 for turning the outer surface is used. For heating and melting the top 12, the edge of the top 12 of the paper container 10 is used as shown in FIG. There is used a top turning device provided with a center chamber 31 for turning the inner surface facing the inner surface, and outer chambers 32 and 33 for turning the outer surface facing the outer surface of the edge of the top portion 12. Each of the chambers 21 to 25 and 31 to 33 of the bottom turning device and the top turning device constitutes a hot air chamber to which hot air is supplied from the outside, and the hot air supplied to the hot air chamber is supplied to the bottom portion 11 of the paper container 10 or It has many injection holes which inject toward the seal part of the top part 12. And about the injection hole of the center chambers 21 and 31, the quantity of the hot air injected toward the inner surface side seal part of each corner part of the bottom part 11 and the top part 12 of the paper container 10 is in other parts of the seal part. The diameter, pitch, or number of holes is changed so as to be larger than the amount of hot air to be injected.
[0025]
In the bottom turning device and the top turning device, each of the chambers 21 to 25 and 31 to 33 faces the bottom portion 11 of the paper container 10 or the seal portion of the top portion 12 and maintains a predetermined gap. Or it installs so that a hot air may be injected from the injection hole toward the turning part set to the seal part of the top part 12.
[0026]
Further, the center chamber 31 of the top turning device is at a speed slower than the speed of hot air toward the original sealing portion toward the expanded turning portion set on the content storage side of the sealing portion on the inner surface side of the top portion 12 of the paper container 10. As shown in FIG. 7, a hot air chamber 41 to which hot air is supplied and a hot air supplied to the hot air chamber 41 are provided in a predetermined arrangement so as to inject toward the seal portion. A plurality of small hot air chambers 44 provided on the front end side so as to communicate with the hot air chamber 41 through the communication holes 43, and the hot air supplied to the small hot air chambers 44 is expanded. A plurality of injection windows 45 that inject toward the turning portion (Injection holes for injecting hot air toward the expanded bore) And a communication passage 46 that communicates the small hot air chamber 44 with the ejection window 45 at each corner portion. Each injection window 45 is set to an opening area that is approximately twice the opening area of the communication hole 43 so that the speed of the hot air injected from the injection window 45 is approximately half the speed of the hot air from the injection hole 42. It is a thing.
[0027]
The hatched areas in FIG. 3 and FIG. 4 are the turning portions a, b, c, d on the inner surface side and the outer surface side of the bottom portion 11 and the top portion 12 of the paper container 10. The inner surface side and the outer surface side turning portions a, b, c, and d are set so as to substantially coincide with the seal portion of the final folding portion of the bottom portion 11 or the top portion 12 of the paper container 10, and on the inner surface side of the top portion 12. For the seal part, the expanded punching part a on the content storage part side of the original seal part 1 Is set. And the extended punching part a 1 Is projected substantially near each corner of the paper container 10.
[0028]
The center chamber 31 of the top turning device is, for example, as shown in FIG. 8 and FIG. 9, and has a short cylindrical shape with a polygonal cross section adapted to the shape of the top portion 12 of the paper container 10, and external hot air An inlet opening (not shown) that communicates with the source has a mounting flange at the edge of the upper end, a hot air chamber 41 inside, an injection hole 42 in the side wall, and a communication that leads to the hot air chamber 41 at the lower end It consists of a chamber body 51 having a hole 43, a spacer 52 disposed at the lower end of the chamber body 51, and a plate 55 fixed to the chamber body 51 with bolts 53 and nuts 54 via the spacer 52. Four communication holes 43 are provided corresponding to each corner of the top 12 of the paper container 10. Then, four small hot air chambers 44 communicating with the respective communication holes 43 are formed between the chamber main body 51 and the plate 55 by the spacer 52 and hot air is jetted toward the vicinity of each corner portion. injection A window 45 is formed, and a communication passage 46 that connects the small hot air chamber 44 and the ejection window 45 at each corner is formed.
[0029]
By heating and melting the top portion 12 of the paper container 10 using the top turning device having the center chamber 31, the inner surface side of the top portion 12 of the paper container 10 goes beyond the original seal portion to the content storage portion side. Overhanging extended part a 1 Hot air is jetted up to and the expanded punching part a 1 On the other hand, hot air is jetted at a slower speed than that for the turning portion a set in the original seal portion. Therefore, it is possible to form an expanded adhesive part that does not generate pinholes on the content storage part side from the original seal part while supplying a sufficient amount of heat to the original seal part by high-temperature rolling, as a result On the inner surface side of the container, the heat pinhole due to swelling can be completely retained in the seal portion so that the heat pinhole does not cause a liquid leak. In particular, the amount of heat can be sufficiently distributed to the inner surface side of the corner portion of the top portion 12 of the paper container 10 and is generated on the inner surface of the corner portion while preventing the poor sealing of the corner portion when being folded and pressurized. The thermal pinhole to be retained can be retained in the seal portion.
[0030]
In the example described above, the expansion portion a on the content storage portion side of the original seal portion with respect to the seal portion on the inner surface side of the top portion 12. 1 Is set, and the extended turning part a 1 The bottom portion 11 is also projected in the vicinity of each corner portion of the paper container 10 with respect to the seal portion on the inner surface side in the same manner. An extended punching portion can be set on the content storage portion side of the original seal portion. The center chamber 21 of the bottom turning device in that case is, for example, as shown in FIGS. 10 and 11 and is a short cylinder with a polygonal cross section that matches the shape of the bottom 11 of the paper container 10, and is used as an external hot air source. There is a mounting flange portion at the edge of the lower end portion having an inlet opening (not shown) that communicates, a hot air chamber (not shown) inside, an injection hole 142 in the side wall portion, and a hot air chamber at the lower end. The chamber body 151 includes a communication hole 143, a spacer 152 disposed at the upper end of the chamber body 151, and a plate 155 fixed to the chamber body 151 with bolts 153 and nuts 154 through the spacer 152. Four communication holes 143 are provided corresponding to each corner of the bottom 11 of the paper container 10. Then, four small hot air chambers 144 communicating with the respective communication holes 143 are formed between the chamber main body 151 and the plate 155 by the spacer 152 and hot air is sprayed toward the vicinity of each corner portion. injection Window 145 (Injection holes for injecting hot air toward the expanded bore) In addition, a communication passage 146 that connects the small hot air chamber 144 and the ejection window 145 at each corner portion is formed. Each injection window 145 is set to have an opening area that is approximately twice the opening area of the communication hole 143 so that the speed of hot air injected from the injection window 145 is approximately half the speed of hot air from the injection hole 142. The
[0031]
The content of the bottom portion 11 of the paper container 10 exceeds the original seal portion by heating and melting the bottom portion 11 of the paper container 10 by using the bottom turning device provided with the center chamber 21 having such a configuration. Hot air is sprayed to the extended flange part that protrudes to the object storage part side, and hot air is sprayed to the extended flange part at a slower speed than the original seal part. It is possible to form an expanded seal part that does not generate pinholes on the side of the contents storage part from the original seal part while supplying a sufficient amount of heat to the part by high temperature squeezing. The heat pinhole is completely retained in the seal portion, and in particular, the amount of heat is sufficiently distributed to the inner surface side of the corner portion of the bottom portion 11 of the paper container 10 to prevent a seal failure at the corner portion. It can heat pinholes generated on the inner surface of the chromatography unit to keep within the sealing portion.
[0032]
In the above example, a small hot air chamber that communicates with the hot air chamber of the chamber body through the communication hole is provided to send hot air to the injection window. The hot air may be supplied by a separate system from the room.
[0033]
In addition to PE / paper / PE / aluminum-deposited PET / PE and PE / paper / PE / silica-deposited PET / PE, various laminated structures can be used as the sheet material for the paper container. In particular, as the vapor deposition layer, the above-mentioned ones are generally used. However, the present invention is not limited to this, and other vapor deposition layers such as aluminum oxide, indium oxide, and tin oxide may be used. It may be a mixture of the above or a plurality of layers.
[0034]
The paper container to which the present invention is applied may be a paper container containing various liquids such as shochu, alcohol such as other sake, juice and other beverages.
[0035]
【The invention's effect】
According to the present invention, since the top or bottom of the liquid paper container is folded and pressure-sealed, the sealing portion is pinned by hot air to melt the thermoplastic adhesive, and the sealing performance is improved by retaining the pinhole in the sealing portion. You can make it.
[Brief description of the drawings]
FIG. 1 is a perspective view of a liquid paper container according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a laminated structure of sheet materials of a liquid paper container according to an embodiment of the present invention.
FIG. 3 is an internal view of a blank of the liquid paper container according to the embodiment of the present invention.
FIG. 4 is an external view of a blank of the liquid paper container according to the embodiment of the present invention.
FIG. 5 is an explanatory diagram showing the arrangement of the chambers in the heat melting of the seal portion at the bottom of the liquid paper container according to the embodiment of the present invention in a plan view.
FIG. 6 is an explanatory view showing the arrangement of the chambers in the heat melting of the seal portion at the top of the liquid paper container according to the embodiment of the present invention in a plan view.
FIG. 7 is an explanatory view showing, in a vertical cross section, the arrangement of chambers in heat melting of the seal portion at the top of the liquid paper container according to the embodiment of the present invention.
FIG. 8 is a perspective view of a center chamber used for heating and melting the seal portion at the top of the liquid paper container according to the embodiment of the present invention.
FIG. 9 is an exploded view of the center chamber used for heating and melting the seal portion at the top of the liquid paper container according to the embodiment of the present invention.
FIG. 10 is a perspective view of an example of a center chamber used for heating and melting the seal portion at the bottom of the liquid paper container.
FIG. 11 is an exploded view of an example of a center chamber used for heating and melting the seal portion at the bottom of the liquid paper container.
[Explanation of symbols]
10 Paper container
11 Bottom
12 Top
21, 31 Center chamber
41 Hot air chamber
42,142 injection holes
43,143 communication hole
44,144 Small hot air chamber
45,145 injection window
46,146 communication path
51,151 Chamber body
52,152 spacer
55,155 plates
a, b, c, d
a 1 Expansion punch

Claims (11)

液体用紙容器の頂部または底部を折り畳んで加圧シールするに際しそのシール部を熱風で炙って熱可塑性接着剤を予め加熱溶融する方法であって、前記液体用紙容器の頂部または底部のシール部に向けて熱風を噴射するとともに、前記液体用紙容器の頂部または底部の内面側のシール部の内容物収納部側近傍に所定の拡張炙り部を設定し、該拡張炙り部に向け、前記内面側のシール部に向けて噴射する熱風の速度よりも遅い速度で熱風を噴射して前記内面側のシール部に対するよりも少ない熱量で該拡張炙り部の熱可塑性接着剤を溶融させ、前記シール部の内容物収納部側にピンホールの発生しない拡張シール部を形成し前記シール部内に熱ピンホールを留めて加圧シールできる状態とすることを特徴とする液体用紙容器のシール部の熱可塑性接着剤を加熱溶融する方法。When the top or bottom of a liquid paper container is folded and sealed under pressure, the seal is sprinkled with hot air and the thermoplastic adhesive is preheated and melted, and directed toward the top or bottom seal of the liquid paper container A predetermined expansion ring portion is set in the vicinity of the contents storage portion side of the seal portion on the inner surface side of the top or bottom of the liquid paper container, and the inner surface side seal is directed toward the expansion ring portion. The hot air is jetted at a speed slower than the speed of the hot air jetted toward the part to melt the thermoplastic adhesive of the expanded rib part with a smaller amount of heat than the seal part on the inner surface side, and the contents of the seal part thermoplastic seal portion of the liquid packaging cartons, characterized in that one is able to expand the seal portion formed by pressure sealed fastening the heat pinholes in the sealed portion without pinholes in the housing portion Method of heating molten adhesive. 前記内面側のシール部に向けて噴射する熱風の速度の略半分の速度で前記拡張炙り部に向けて熱風を噴射する請求項１記載の液体用紙容器のシール部の熱可塑性接着剤を加熱溶融する方法。  2. The thermoplastic adhesive of the seal portion of the liquid paper container is heated and melted at a rate approximately half the speed of the hot air sprayed toward the seal portion on the inner surface side. how to. 前記拡張炙り部を前記液体用紙容器の頂部または底部のコーナー部近傍に設定し、該コーナー部の内面側のシール部に向けて噴射する熱風の量を該シール部の他の部分に噴射する熱風の量よりも多くする請求項１または２記載の液体用紙容器のシール部の熱可塑性接着剤を加熱溶融する方法。  Hot air for injecting the amount of hot air to be sprayed toward the seal portion on the inner surface side of the corner portion to the other portion of the seal portion, with the expanded curling portion being set near the corner portion of the top or bottom of the liquid paper container The method of heating and melting the thermoplastic adhesive of the seal portion of the liquid paper container according to claim 1 or 2, wherein the amount is larger than the amount of the above. 前記液体用紙容器のシート素材が、紙層を基材層とし無機物の蒸着層を有するプラスチック層を中間層とし熱可塑性接着剤層を内層および外層とする積層体である請求項１，２または３記載の液体用紙容器のシール部の熱可塑性接着剤を加熱溶融する方法。  The sheet material of the liquid paper container is a laminate in which a paper layer is a base layer, a plastic layer having an inorganic vapor deposition layer is an intermediate layer, and a thermoplastic adhesive layer is an inner layer and an outer layer. A method for heating and melting the thermoplastic adhesive in the seal portion of the liquid paper container described in the above. 液体用紙容器の頂部または底部を折り畳み加熱圧着するに際しそのシール部を熱風で炙って熱可塑性接着剤を予め加熱溶融する装置であって、前記液体用紙容器の頂部または底部の端縁の内面に臨んで設置される熱風噴射用のチャンバーを備え、該チャンバーが、熱風が供給される熱風室と、該熱風室に供給された熱風を前記液体用紙容器の頂部または底部の端縁のシール部に向けて噴射する多数の噴射孔とを有するとともに、前記熱風室に連通穴を介して連通し前記熱風室から熱風が供給される小熱風室と、該小熱風室に供給された熱風を前記液体用紙容器の頂部または底部の内面側のシール部の内容物収納部側近傍に設定した所定の拡張炙り部に向けて前記シール部に向けて熱風を噴射する噴射孔からの熱風の速度よりも遅い速度で噴射する噴射孔とを有することを特徴とする液体用紙容器のシール部の熱可塑性接着剤を加熱溶融する装置。When the top or bottom of a liquid paper container is folded and heat-pressed, the sealing part is struck with hot air to preheat and melt the thermoplastic adhesive, which faces the inner surface of the edge of the top or bottom of the liquid paper container. A hot air jet chamber installed in the hot air chamber, the hot air chamber to which hot air is supplied, and the hot air supplied to the hot air chamber toward the seal portion at the top or bottom edge of the liquid paper container. A small hot air chamber that communicates with the hot air chamber through a communication hole and is supplied with hot air from the hot air chamber, and the hot air supplied to the small hot air chamber is the liquid paper. A speed that is lower than the speed of hot air from the injection hole that injects hot air toward the seal portion toward a predetermined expansion flange set near the contents storage portion side of the seal portion on the inner surface side of the top or bottom of the container Jetted in That the injection hole and apparatus for heating and melting the thermoplastic adhesive of the sealing portion of the liquid packaging cartons characterized in that it comprises a. 前記シール部に向けて噴射する熱風の速度の略半分の速度で前記拡張炙り部に向けて熱風が噴射される請求項５記載の液体用紙容器のシール部の熱可塑性接着剤を加熱溶融する装置。  The apparatus for heating and melting the thermoplastic adhesive in the seal portion of the liquid paper container according to claim 5, wherein hot air is jetted toward the expanded punching portion at a speed approximately half the speed of hot air jetted toward the seal portion. . 前記液体用紙容器の頂部または底部の各コーナー部の内面側のシール部に向けて噴射する熱風の量が該シール部の他の部分に噴射する熱風の量よりも多くなるよう、前記シール部に向けて熱風を噴射する噴射孔が配置されるとともに、該コーナー部近傍に前記拡張炙り部が設定された請求項５または６記載の液体用紙容器のシール部の熱可塑性接着剤を加熱溶融する装置。In the seal portion, the amount of hot air sprayed toward the inner surface side seal portion of each corner portion of the top or bottom portion of the liquid paper container is larger than the amount of hot air sprayed to other portions of the seal portion. 7. An apparatus for heating and melting a thermoplastic adhesive in a sealing portion of a liquid paper container according to claim 5 or 6, wherein an injection hole for injecting hot air is disposed and the expansion rib portion is set in the vicinity of the corner portion. . 前記チャンバーが、断面多角形の短筒状で内部に前記熱風室を有し側壁部に前記シール部に向けて熱風を噴射する噴射孔を有するとともに端部に前記熱風室につながる連通穴を有するチャンバー本体と該チャンバー本体の端部に配置されたスペーサーと該スペーサーを介して取り付けられたプレートからなり、前記連通穴は、前記チャンバー本体の前記液体用紙容器の頂部または底部の各コーナー部に対応する位置にそれぞれ設けられ、前記スペーサーにより、前記チャンバー本体と前記プレートとの間に前記連通穴に連通するよう前記小熱風室が形成されるとともに、前記コーナー部近傍に設定された拡張炙り部に向けて熱風を噴射するよう前記拡張炙り部に向けて熱風を噴射する噴射孔と、前記小熱風室と前記拡張炙り部に向けて熱風を噴射する噴射孔とを連通する連通路が形成された請求項７記載の液体用紙容器のシール部の熱可塑性接着剤を加熱溶融する装置。The chamber has a short cylindrical shape with a polygonal cross section, has the hot air chamber inside, has an injection hole for injecting hot air toward the seal portion on a side wall portion, and has a communication hole connected to the hot air chamber at an end portion. It consists of a chamber body, a spacer disposed at the end of the chamber body, and a plate attached via the spacer, and the communication hole corresponds to each corner of the top or bottom of the liquid paper container of the chamber body respectively provided at positions, by said spacer, said together with the so communicating with the communication hole between the chamber body and the plate small hot air chamber is formed in the extended grilled portion which is set in the vicinity of the corner portion an injection hole for injecting hot air toward the extension broiling unit to inject the hot air toward the hot air toward the extension broiling unit and the small hot air chamber Morphism injects holes and the sealing unit apparatus for heating and melting the thermoplastic adhesive liquid paper container according to claim 7, wherein the communication passage is formed which communicates the. 前記拡張炙り部に向けて熱風を噴射する噴射孔の開口面積が前記連通穴の開口面積より大きい請求項８記載の液体用紙容器のシール部の熱可塑性接着剤を加熱溶融する装置。 The apparatus for heating and melting the thermoplastic adhesive of the seal portion of the liquid paper container according to claim 8, wherein an opening area of the injection hole for injecting hot air toward the expanded punching portion is larger than an opening area of the communication hole. 前記拡張炙り部に向けて熱風を噴射する噴射孔の開口面積が前記連通穴の開口面積の略２倍である請求項９記載の液体用紙容器のシール部の熱可塑性接着剤を加熱溶融する装置。 The apparatus for heating and melting the thermoplastic adhesive of the seal portion of the liquid paper container according to claim 9, wherein an opening area of the injection hole for injecting hot air toward the expanded punching portion is approximately twice the opening area of the communication hole. . 前記液体用紙容器のシート素材が、紙層を基材層とし無機物の蒸着層を有するプラスチック層を中間層とし熱可塑性接着剤層を内層および外層とする積層体である請求項５，６，７，８，９または１０記載の液体用紙容器のシール部の熱可塑性接着剤を加熱溶融する装置。  The sheet material of the liquid paper container is a laminate in which a paper layer is a base layer, a plastic layer having an inorganic vapor deposition layer is an intermediate layer, and a thermoplastic adhesive layer is an inner layer and an outer layer. , 8, 9 or 10 is a device for heating and melting the thermoplastic adhesive in the seal portion of the liquid paper container.
JP16623798A 1998-05-29 1998-05-29 Method and apparatus for heating and melting thermoplastic adhesive in sealing part of liquid paper container Expired - Lifetime JP4094728B2 (en)

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JP16623798A JP4094728B2 (en) 1998-05-29 1998-05-29 Method and apparatus for heating and melting thermoplastic adhesive in sealing part of liquid paper container

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Application Number Priority Date Filing Date Title
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JP4576683B2 (en) * 2000-08-28 2010-11-10 凸版印刷株式会社 Hot air blowing oven
JP2002301779A (en) * 2001-04-06 2002-10-15 Dainippon Printing Co Ltd Heating device for sealing carton top
GB0411721D0 (en) * 2004-05-26 2004-06-30 Elopak Systems Method and apparatus
ITBO20050167A1 (en) * 2005-03-17 2005-06-16 Gd Spa METHOD AND DEVICE FOR PACKAGING PACKAGES FOR SMOKE ITEMS
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