JP2605921B2 - 液体容器の頂部のヒートシール方法 - Google Patents

液体容器の頂部のヒートシール方法

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Publication number
JP2605921B2
JP2605921B2 JP9885590A JP9885590A JP2605921B2 JP 2605921 B2 JP2605921 B2 JP 2605921B2 JP 9885590 A JP9885590 A JP 9885590A JP 9885590 A JP9885590 A JP 9885590A JP 2605921 B2 JP2605921 B2 JP 2605921B2
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JP
Japan
Prior art keywords
heat
sealing
sealing surface
pressing
liquid container
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP9885590A
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English (en)
Other versions
JPH046025A (ja
Inventor
寿裕 真鍋
昌秀 藤本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toppan Inc
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Toppan Inc
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Priority to JP9885590A priority Critical patent/JP2605921B2/ja
Publication of JPH046025A publication Critical patent/JPH046025A/ja
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Publication of JP2605921B2 publication Critical patent/JP2605921B2/ja
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws
    • B29C66/81812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws the welding jaws being cooled from the outside, e.g. by blowing a gas or spraying a liquid
    • 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
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/349—Cooling the welding zone on the welding spot
    • 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
    • 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
    • B29C66/71—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
    • B29C66/712—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 the composition of one of the parts to be joined being different from the composition of the other part
    • 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
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81457—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a block or layer of deformable material, e.g. sponge, foam, rubber
    • 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
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • 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
    • 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
    • B29C66/80—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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
    • B29K2711/12—Paper, e.g. cardboard
    • B29K2711/123—Coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2821/00—Use of unspecified rubbers as mould material
    • 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)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Package Closures (AREA)

Description

【発明の詳細な説明】 【産業上の利用分野】
本発明は、ゲーベルトップ型液体容器等の頂部をヒー
トシールする方法に関する。
【従来の技術】
牛乳、ジュース、お酒等を収納するゲーベルトップ型
等の液体容器は、廉価で且つ断熱効果を有する紙を基材
とし、表裏に積層したポリエチレン等のヒートシール性
に優れた樹脂フィルムをヒートシールすることにより製
造されている。 しかし、容器の強度アップと保形性を高める目的で基
材には厚手の紙が使用されているため、シール面の背部
に加熱板を押圧しても基材の紙が断熱性を有するためシ
ール面の樹脂フィルムをヒートシール可能な温度に加熱
することは容易でない。したがって、シール面に400〜6
00℃程度の熱風を吹き付け、前記樹脂フィルムをヒート
シール可能な温度になるまで加熱し、背部より適宜の押
圧手段を用いて押圧することによりシールする方法が取
られている。
【発明が解決しようとする課題】
しかしながら、上記した従来のヒートシール方法にお
いてはシール面の樹脂フィルムをヒートシール可能な温
度に加熱すると、その背部も相当に温度が上昇するた
め、該背部を押圧する押圧手段もシールの繰り返しと共
に過熱状態になる。このため、背部側の樹脂フィルムが
押圧手段に融着して剥がれたり、該樹脂フィルムに印刷
した製造月日等のインキが取れると云う問題点があっ
た。
【課題を解決するための手段】
本発明は上記した従来技術の課題を解決するためにな
されたもので、少なくとも最内層および最外層が熱可塑
性樹脂からなる紙製の液体容器の頂部をヒートシールす
る際、加熱したシール面の背部、もしくはシール面を加
熱する手段とは別体に準備された押圧手段の押圧面に冷
却水を供給しながら、シール面の背部を押圧してシール
することを特徴とするヒートシール方法である。
【作用】
本発明はシール面の背部、もしくはシール面を加熱す
る手段とは別体に準備された押圧手段の押圧面に冷却水
を供給しながらシール面の背部を押圧するので、前記押
圧面が加熱することがない。このため前記背部の樹脂フ
ィルムに剥がれる等の欠陥を生じることがない。
【実施例】
つぎに本発明の一実施例を図面に基づいて詳細に説明
する。 本発明によってヒートシールする被シール部材として
は、廉価で断熱性に優れた紙11を基材（坪量350g/m2）
とし、ヒートシール性に優れた厚さ20μｍのポリエチレ
ンフィルム12とポリエチレンフィルム13とが表裏に積層
された複合シート１等であり、ガスバリヤー性と遮光性
を高めるために適宜の厚さのアルミニューム箔を挟装し
たりすることも可能である。そして、前記シート１を折
り曲げる等して液体容器２を形成する際の頂部21が本発
明によってシールされる。 符号３はプレスゴム31と受け部32とから構成された押
圧手段であり、中間点に向かって双方が移動し、液体容
器２の前記頂部21を両側から押圧可能に設けられてい
る。符号４は冷却水41を保水するスポンジ42と、該スポ
ンジ42に冷却水41を供給する給水管43、およびスポンジ
押え44とから構成される給水手段であり、配置の詳細は
スポンジ42が、冷却水41を押圧手段３の前記プレスゴム
31の押圧面311に滴下可能にプレスゴム31の押圧面311の
真上に配置され、スポンジ押え44が押圧手段３の受け部
32側から先端部441をスポンジ42に向け、プレスゴム31
の押圧面311が頂部21のシール面の背部13Bに接する直前
に、先端部441がスポンジ42に突き当たり、該スポンジ4
2に保水されていた冷却水41をプレスゴム31の押圧面311
に滴下可能に配設して用いられる。したがって、プレス
ゴム31の押圧面311は冷却水41によってヒートシールの
度に冷却されるため、シールを繰り返しても蓄熱されて
過熱状態になることがないので、常時良好な状態で次の
ヒートシールに対応することが出来る。 液体容器２の前記頂部21は複合シート１の内側に積層
されたポリエチレンフィルム12の対峙するシール面12A
と12B、および外側に積層されたポリエチレンフィルム1
3の対峙するシール面13Aそれぞれをヒートシールするこ
とによって形成されるので、適宜の加熱手段を用いて頂
部21を形成する複合シート１の上端部側のポリエチレン
12と13とを大略550℃の熱風によりヒートシール可能な1
20〜130℃になるまで加熱した後、従来周知の頂部形成
手段を用いて対向する天板22同士を折り込みながら、他
の対向する天板23同士を接近させて頂部21の前記シール
面12A、12B、および13Aを接触させ、該シール面の背部1
3Bと13Cとを押圧手段３のプレスゴム31と受け部32によ
って適宜の圧力によって押圧すると、前記シール面12
A、12B、および13Aそれぞれがシールされた。なお、製
造月日等が印刷された背部13Bをプレスゴム31側に配置
してヒートシールしたので、該プレスゴム31が前記背部
13Bに接触する直前にスポンジ押え44の先端部441がスポ
ンジ42に突き当たり、該スポンジ42が保水していた冷却
水41がプレスゴム31の押圧面311に滴下し、該押圧面311
とシール面の背部13Bのポリエチレンフィルム13が急冷
された。このため、前記印刷が消えることもなかった
し、ポリエチレンフィルム13がプレスゴム31の押圧面31
1に融着することもなかった。 なお、給水管43によるスポンジ42への冷却水41の補給
は、ヒートシール１回毎に補給しても良いし、スポンジ
42の保水量を大きく形成しておけば１回の補給で数回の
ヒートシールに対応させることも可能である。 また、第５図に示した様に水量調整バルブ45等を介し
て冷却水41が供給可能に配管されたスポンジ製の冷却ロ
ーラー46を、加熱されたシール面の背部13Bに回転接触
させることにより該背部13Bを急冷し、その後適宜の押
圧手段によって該背部13Bを押圧することによりシール
面それぞれをシールすることも出来る。この様に、シー
ル面の背部13Bの冷却を、押圧工程に先立って独立して
設けることも出来る。ただ、シール面の背部13Bに直接
水を供給して冷却すると、基材に厚手の紙を用いた場合
は良いが、薄手の紙を用いた場合は、内側のシール面ま
で冷却されてしまい接着性が悪くなることがあるので、
薄手の紙を用いた場合には、押圧手段に水を供給する方
が好ましい。さらに、上記実施例においてはシール面の
一方の背部のみを急冷したのち押圧シールしたが、両方
の背部を急冷させて押圧するものであっても勿論構わな
い。
【発明の効果】
以上説明した様に、本発明は少なくとも最内層および
最外層が熱可塑性樹脂からなる紙製の液体容器の頂部を
ヒートシールする際、加熱したシール面の背部、もしく
はシール面を加熱する手段とは別体に準備された押圧手
段の押圧面に冷却水を供給しながら、シール面の背部を
押圧してシールすることを特徴とするヒートシール方法
であるから、被シール部材のシール面をヒートシール可
能に加熱するとき、シール面の背部が加熱されていても
該背部を押圧手段が押圧する際には冷却されている。こ
のため背部の樹脂フィルムが剥がれたりすることがない
し、製造月日等の印刷が施されていても、該印刷のイン
キが剥がれて見え難くなることもない。したがって、ヒ
ートシール性に優れた樹脂フィルムと、断熱性の高い紙
等からなる複合シートを用いてゲーベルトップ型液体容
器を初めとする液体容器等を製造する際に、適用が簡便
であり、しかも欠陥が発生し難いヒートシール方法であ
るので実用的な効果が大きい。
【図面の簡単な説明】 第１図は本発明の実施例の説明図、第２図は一実施例で
シールした容器の説明図、第３図は一実施例で用いた複
合シートの断面説明図、第４図は一実施例に用いた装置
の要部の説明図、第５図は他の背部冷却例を示す説明図
である。 １……複合シート、11……紙、12、13……ポリエチレン
フィルム、２……液体容器、21……頂部、３……押圧手
段、31……プレスゴム、311……押圧面、32……受け
部、４……冷却手段、41……冷却水、42……スポンジ、
43……給水管、44……スポンジ押え、46……冷却ローラ
ー。

Claims (1)

    (57)【特許請求の範囲】
  1. 【請求項１】少なくとも最内層および最外層が熱可塑性
    樹脂からなる紙製の液体容器の頂部をヒートシールする
    際、加熱したシール面の背部、もしくはシール面を加熱
    する手段とは別体に準備された押圧手段の押圧面に冷却
    水を供給しながら、シール面の背部を押圧してシールす
    ることを特徴とするヒートシール方法。
JP9885590A 1990-04-13 1990-04-13 液体容器の頂部のヒートシール方法 Expired - Lifetime JP2605921B2 (ja)

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JPH046025A JPH046025A (ja) 1992-01-10
JP2605921B2 true JP2605921B2 (ja) 1997-04-30

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Publication number Priority date Publication date Assignee Title
JP5135721B2 (ja) * 2006-06-14 2013-02-06 大日本印刷株式会社 紙容器頂部加熱装置
GB0909162D0 (en) * 2009-05-28 2009-07-08 Elopak Systems A method
JP7169997B2 (ja) * 2017-05-30 2022-11-11 テトラ ラバル ホールディングス アンド ファイナンス エス エイ 食品製品用パッケージの上部を密封するための装置及び食品パッケージを形成し充填するためのシステム
BR112021002694A2 (pt) 2018-09-10 2021-05-11 Tetra Laval Holdings & Finance S.A. métodos para conformar um tubo de uma folha contínua e para produzir embalagens vedadas, e, máquina de acondicionamento para produzir embalagens vedadas.
US11820540B2 (en) 2018-09-11 2023-11-21 Tetra Laval Holdings & Finance S.A. Packaging apparatus for forming sealed packages

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58116502U (ja) * 1982-01-30 1983-08-09 凸版印刷株式会社 密封容器用頂部封着装置
JPH01232262A (ja) * 1988-03-11 1989-09-18 Teijin Ltd 試験管のシール装置及びシール方法

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