JP2005014975A - Paper container - Google Patents

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Publication number
JP2005014975A
JP2005014975A JP2003182433A JP2003182433A JP2005014975A JP 2005014975 A JP2005014975 A JP 2005014975A JP 2003182433 A JP2003182433 A JP 2003182433A JP 2003182433 A JP2003182433 A JP 2003182433A JP 2005014975 A JP2005014975 A JP 2005014975A
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JP
Japan
Prior art keywords
edge
paper
container
paper container
base sheet
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.)
Pending
Application number
JP2003182433A
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Japanese (ja)
Inventor
Masayuki Taniguchi
谷口　　正幸
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
Original Assignee
Toppan Printing Co Ltd
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Publication date
Application filed by Toppan Printing Co Ltd filed Critical Toppan Printing Co Ltd
Priority to JP2003182433A priority Critical patent/JP2005014975A/en
Publication of JP2005014975A publication Critical patent/JP2005014975A/en
Pending legal-status Critical Current

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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
    • B29C66/40—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
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • 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
    • B29C66/70—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
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/02—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape
    • B65D3/06—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape essentially conical or frusto-conical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/10—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by form of integral or permanently secured end closure
    • B65D3/12—Flanged discs permanently secured, e.g. by adhesives or by heat-sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/28—Other details of walls
    • 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

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper container using an end face processing method for forming the interior of a joint of a body part between both ends without performing a complicated processing process and protecting a paper end face. <P>SOLUTION: The paper container is formed by using a container forming blank made of a base material sheet mainly composed of a paper. End edge extended pieces (5 and 5), which are made by extending thermoplastic resin layers (2 and 2) laminated on the base material sheet (1) by a prescribed length along the end edges of the material sheet, are formed on both opposite end edges of the container forming blank (8), respectively. Both ends of the blank (8) are made to overlap each other in such a way that the paper part of the base material sheet does not overlap and one end edge extended piece (5) is set inside of the paper container while the other end edge extended piece (5) is set outside. Then both extended pieces (5 and 5) are heat pressure-bonded together. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、紙を主体とする基材シートからなる紙容器、特に筒状の胴部材と底部材とを用いた紙容器に関し、例えば充填された液状物等の内容物が接触する箇所に紙端面が露出しない構造の紙容器に関するものである。
【０００２】
【従来の技術】
従来より、紙を主体とする基材シートからなる容器形成用ブランクスを用いて形成される紙容器、例えば胴部形成用ブランクスの一方の端縁をもう一方の端縁に重ね合わせて胴部貼り合わせ部を形成させて筒状の胴部材とすると共に、この胴部材の下部に底部材を取り付けて、カップ状或いは円筒状（缶形状）の紙容器、飲料や菓子などの食品用容器をはじめとして、さまざまな分野で使用されていることは広く知られている。
【０００３】
これらの容器においては、従来は図５に示すように、両面にポリエチレン樹脂（４１）等を塗工した紙基材シート（４０）からなるカップ成形用ブランクス（４２）を筒状に丸めて、重ね合わせた端縁どうしに熱圧を加えて溶着して紙カップの胴部（４５）を構成する。さらに、胴部の下部に底部材（４６）を嵌め込み胴部下部の一部を内側に折り曲げて底部材を固定するとともに、紙カップの胴天部の端縁を外側に丸め込みトップカール（ｔ）を形成してカップ状の紙容器としたものである。
【０００４】
しかし、胴部材の接合部（ｋ）の内側は紙基材シートの切断面（端面）が露出しており、内容物の端面への接触（紙への浸透）や気体の透過を防ぐことはできない。そこで、図示はしないが接合部内側の先端から所定の長さだけ、紙基材シートの厚みの半分を削り取り（スカイブ）、その残りの半分を削除面が内側になるように折り返す（ヘミング）ことによって、紙の切断面（端面）が露出しないようにしたり、また紙の端面を露出させない他の方法として、端縁を覆うテープ状部材を貼り付ける方法により、内容物の端面への接触（紙への浸透）や気体の透過を防ぐ対策が施されていた。
【０００５】
【発明が解決しようとする課題】
これらの方法においては、基材シート端縁のスカイブヘミング加工は特別な機械による複雑な加工工程が必要であり、また、削った紙の紙粉が容器に付着して内容物に混入する等の問題が起きていた。また、テープ状部材を貼り付ける方法は、別部材であるテープが必要となるし、貼り付けのための装置が必要となり工程を複雑にする等の問題があった。さらに、特に問題となる点は、スカイブヘミング加工やテープ状部材を貼り付ける方法は、胴部材の接合部（ｋ）の厚みが増えてしまうことにより、図６に示すように、胴部貼り合わせ部における天部のトップカール部分に段差（ｄ）が生じたり、また、胴部の下部においては底部材（４６）を固定するための折り曲げ部において、この接合部が二重の紙基材シートの厚みとなり底部材の固定が安定しない等、容器の密封性を低下させるといった問題があった。
【０００６】
そこで本発明は上記の問題を解決するために成されたもので、複雑な加工工程をせずとも胴部貼り合わせ部分の内側になる端面処理をする方法であり、紙端面の保護が可能な紙容器を提供することにある。
【０００７】
【課題を解決するための手段】
本発明の請求項１記載の発明では、紙を主体とする基材シートからなる容器形成用ブランクスを用いて形成される紙容器であって、容器形成用ブランクスの対向する両端縁に、基材シート上に積層された熱可塑性樹脂層を端縁に沿って所定幅延設してなる端縁延設片が設けられており、前記基材シートの紙部分が重ならないように、かつ一方の端縁延設片が紙容器の内側に、他方の端縁延設片が外側にくるように両端部を重ね合わせ、各々の端縁延設片どうしを熱圧着したことを特徴とする紙容器である。
【０００８】
また、本発明の請求項２に記載の発明は、紙を主体とする基材シートからなる容器形成用ブランクスの一方の端縁をもう一方の端縁に重ね合わせて胴部貼り合わせを形成させて筒状の胴部材とし、該胴部材の下部に底部材を取り付けてなる紙容器であって、前記胴部ブランクスの両方の端縁に、基材シート上に積層された熱可性樹脂層を前記端縁に沿って所定幅延設してなる端縁延設片が設けられており、前記基材シートの紙部分が重ならないように、かつ一方の端縁延設片が紙容器の内側に、他方の端縁延設片が紙容器の外側にくるように両端部を重ね合わせ、各々の端縁延設片どうしを熱圧着することにより前記基材シートの端縁が被覆されていることを特徴とする紙容器である。
【０００９】
また、本発明の請求項３に記載の発明は、基材シートの表裏両面に熱可性樹脂層が積層され、それぞれの熱可性樹脂層を前記両方の端縁に沿って所定幅延設してなる端縁延設片が設けられいると共に、この重なりあった端縁延設片同志を接着することにより、前記端縁が被覆されていることを特徴とする請求項１または請求項２のいずれかに記載の紙容器である。
【００１０】
本発明において、基材シートが、バリア層を含むことができる。或いは基材シート上に、バリア層を積層することができる。
前記バリア層は金属箔、金属蒸着フィルム、金属化合物蒸着フィルムのいずれかであることを特徴とするものである。
【００１１】
本発明において、基材シートの両端縁に細長いコ字状の切り欠きを形成し、この切り欠き部分に端縁延設片が設けられていることを特徴とするものである。
【００１２】
また、本発明の請求項８の発明は、紙を主体とする基材シートから容器形成用ブランクスを打ち抜き或いは切り出し形成し、この紙容器形成用ブランクスを用いて紙容器を形成する製造方法であって、前記容器形成用ブランクスの対向する両方の端縁となる位置に隣接して打ち抜き孔を設ける工程と、少なくとも該打ち抜き孔を覆うように基材シート上に熱可塑性樹脂層を積層する工程と、前記打ち抜き孔を覆って形成された熱可塑性樹脂層を、前記端縁の外方に所定の幅の端縁延設片を形成するように容器形成用ブランクスを打ち抜き或いは切り出して形成する工程と、該容器形成用ブランクスを容器形状に成形する工程とを含むことを特徴とする紙容器の製造方法である。
【００１３】
【発明の実施の形態】
以下に、本発明の紙容器をカップ形状の一実施の形態に基づき詳細に説明するものである。
【００１４】
図１、２に示すように、本発明の一実施例は、容器形成用ブランクスである扇形状の胴部形成用ブランクス（８）の両端縁（３，３）を付け合わせて胴部貼り合わせ部（１５）を形成し、下方に向けて先細る円筒形状の胴部材（１０）としたものである。さらに、周縁部（１１）を下向きに起立させて略円形状の底部材（１２）とし、前記胴部材（１０）の下部内面に底部材の周縁部（１１）の内面を接合させ、さらにこの周縁部を覆うように胴部材の下端縁部を内方に折り曲げ、底部材（１２）の周縁部外面に接合させて環状脚部（１６）を形成させて、次に胴部材の上部周縁を外側に巻き込みトップカール（ｔ）を形成した紙容器（２０）である。
【００１５】
本発明における紙カップ構成は、紙を主体とする基材シート（１）からなる容器形成用ブランクスである扇形状の胴部形成用ブランクス（８）を両面から包み込むように熱可塑性樹脂層（２，２）積層したもので、この基材シート上に積層された熱可塑性樹脂層を、扇形状の胴部形成用ブランクス（８）の両端縁に沿って所定幅延設してなるポリエチレン樹脂などからなる熱可塑性樹脂層による端縁延設片（５，５）を設けたものである。前記基材シートの紙部分の端縁（３，３）が重ならないように付け合わせて、かつ一方の端縁延設片（５）が紙容器の内側に、他方の端縁延設片（５）が外側にくるように端縁延設片（５，５）どうしを重ね合わせ胴部貼り合わせ部（１５）としたもので、各々の端縁延設片どうしを熱圧着することにより筒状の胴部材（１０）が得られる。
【００１６】
またさらに、図３に示すように、周縁部（１１）を下向きに起立させて略円形状の底部材（１２）とし、前記胴部材（１０）の下部内面に底部材の周縁部（１１）の内面を接合させ、さらにこの周縁部を覆うように胴部材の下端縁部を内方に折り曲げ、底部材（１２）の周縁部外面に接合させて環状脚部（１６）を形成させて、次に胴部材の上部周縁を外側に巻き込みトップカール（ｔ）を形成した紙容器（２０）である。
従って、この紙容器は胴部ブランクスの両方の端縁に、基材シート上に積層された熱可性樹脂層を、この端縁に沿って所定幅延設してなる端縁延設片が設けられており、前記基材シートの紙部分が重ならないように、かつ一方の端縁延設片が紙容器の内側に、他方の端縁延設片が紙容器の外側にくるように両端部を重ね合わせ、各々の端縁延設片どうしを熱圧着することにより前記基材シートの端縁（３，３）、及び貼り合わせ部が被覆された紙容器が得られる。
【００１７】
次に、本発明の他の実施例を示すと、図４に示すように、扇形状の胴形成用ブランクス（８）の両端縁にコ字状の切り欠き部（２２，２２）を設けたもので、前記同様に、この基材シート（１）の表裏両面にはポリエチレン等からなる熱可塑性樹脂層（２，２）を設けたもので、その際、コ字状の切り欠き部も含めて覆うように端縁延設片（５，５）を設けたものである。また、コ字状の切り欠き部を形成する際には、前記胴部材下部の環状脚部（１６）と上部のトップカール（ｔ）を形成するために除いて形成することが良い。
この切り欠き部にある熱可塑性樹脂層の部分は、端縁延設片でありコ字状の切り欠き部を被覆した端縁延設片（５，５）どうしを重ね合わせて熱圧着することで基材シートの端縁（３，３）及び貼り合わせ部の内側、外側の基材シート端面が被覆された紙容器が得られるものである。
【００１８】
次いで、熱可塑性樹脂層（２，２）は基材シート（１）の表裏両面にドライラミネート法、溶融押し出しコート法等の公知の方法により積層する。
【００１９】
また、コ字状の切り欠き部は、打ち抜き形成することが簡便であるが、ブランクスの形状によってはスリット加工や切断加工等により形成することも可能である。このコ字状の切り欠き部（２２，２２）の幅は、２〜１０ｍｍ程度とすることが望ましい。
【００２０】
また、熱可塑性樹脂層（２，２）による端縁延設片（５，５）の幅は、切り欠き部の有無に係わらず１ｍｍ〜１０ｍｍ程度とすることが好ましい。
【００２１】
本発明において用いる基材シート（１）には、図示はしないが、バリア層を設けることができる。バリア層としては、一軸ないし二軸延伸されたポリエチレンテレフタレートフィルム、ポリアミドフィルム、ポリオレフィンフィルム等の延伸フィルム上に、アルミニウム等の金属ないし酸化アルミニウムや酸化ケイ素等の無機化合物の薄膜を物理蒸着あるいは化学蒸着等の蒸着法により２０〜１００ｎｍ程度の厚みに設けた無機化合物蒸着プラスチックフィルムが使用できる。なかでも、ポリエチレンテレフタレートフィルム上に金属ないし無機化合物の薄膜を蒸着した蒸着フィルムがより好ましく使用できる。
【００２２】
また、アルミニウム箔等の金属箔や、エチレン−酢酸ビニル共重合体、ポリ塩化ビニリデン等の周知のバリア性材料を採用することもできる。
【００２３】
また、このバリア層は、水溶性樹脂と無機層状化合物を含有する被膜、または金属アルコキシドあるいはその加水分解物とイソシアネート化合物を反応させた被膜からなる樹脂層とすることもできる。さらにまた、上記バリア層は、基材シート（１）とは別体とし、基材シートに積層することもできる。
【００２４】
こうして作製した胴部材と底部材から公知の成形機によりカップ形状の紙容器を得ることができる。
得られたカップ状の紙容器は、胴部の貼り合わせ部の厚みが基材シート一枚分となり、さらに上部の開口部に段差が無くなるので、ヒートシール蓋などにより封止することができる。
【００２５】
なお、胴部形成用ブランクス（８）は扇形状とは限らず、図示はしないが、例えば長方形状でも、正方形状でも構わない。この場合には、上部と底部の口径が略同じ筒状の紙容器が成形することができる。
【００２６】
上記した実施例においては、基材シート（１）の両面に熱可塑性樹脂層を設けてシートの端縁を覆うようにしたが、限定されるものではなく、基材シートの一方の面に設けた熱可塑性樹脂層（２）にのみによって端縁を覆うようにすることも可能である。
【００２７】
なお、熱可塑性樹脂層（２）により被覆する端縁は、容器の内面側に位置する端縁とすることが一般的であるが、本発明の紙容器においては、表裏を被覆することにより容器の内、外面の端縁を保護することができるので、例えば台所や洗面所、浴室等の水回りで用いる容器として採用することができる。
【００２８】
また、図示はしないが、容器の端縁は胴部貼り合わせ部の端縁は勿論、それ以外の端縁、例えば胴部材の内側に折り曲げられる下部の端縁であっても密封性が得られる。
【００２９】
【発明の効果】
本発明は以上の構成であるから、下記に示す如き効果がある。
すなわち、本発明の紙容器は、胴部貼り合わせ部において基材シートの端縁（端面）を露出させないように熱可塑性樹脂層を延設して端縁延設片を形成して端縁を保護するので、水分バリア性やガスバリア性に優れた容器である。また、本発明の端面保護の方法によれば、保護テープ等の別部材が不要であり、製造工程も容易である。
【００３０】
さらに、従来のスカイブヘミングやテープ貼りによる端縁保護の方法に比べ、胴部材の端縁部分の重なりがなく、熱可塑性樹脂層を延設した端縁延設片どうしによる接合のため、カップ全体が均一な厚みとなり容器自体の段差や底部材の固定の際の胴部材下部の折り曲げも厚みが大きくならない。従って、容器を殺菌する場合などには、殺菌液が回り易いので殺菌が行い易く、また乾燥も行い易く、殺菌液の残留も少なく抑えることができる。
【００３１】
また、本発明の紙容器は、容器の内、外面の端縁を全て保護することができるので、例えば台所や洗面所、浴室等の水回りで用いる容器として採用することができる等の優れた効果を奏する。
【図面の簡単な説明】
【図１】本発明の一実施例における紙容器形成用の部材を示すもので、（Ａ）は熱可塑性樹脂で覆って両端縁に端縁延設片を設けたブランクスを示し、（Ｂ）はこの側面からみた説明図である。
【図２】上記の部材による紙容器形成工程を示すもので、（Ａ）は上記ブランクスを貼り合わせた胴部材であり、（Ｂ）はこの底部材を示し、（Ｃ）は完成したカップ形状の紙容器の断面図である。
【図３】本発明に係る完成したカップ状の紙容器の胴部における貼り合わせ部を示すもので、（Ａ）はカップ状の紙容器の断面図であり、（Ｂ）はこの 貼り合わせ部における端縁延設片どうしの溶着状態を示す断面説明図である。
【図４】本発明の他の実施例における、扇形状のブランクス両端縁にコ字形状の切り欠き部と端縁延設片を設けた状態を示す平面図である。
【図５】従来のおける紙カップの製造工程を示す説明図である。
【図６】従来のおける紙カップにおける問題点を示すもので、（Ａ）は胴部回りの段差を示し、（Ｂ）は底部固定用の胴部における厚みの差を示す説明図である。
【符号の説明】
１ ……基材シート
２ ……熱可塑性樹脂層
３ ……基材シートの端縁（端面）
５ ……端縁延設片
８ ……ブランクス
１０……胴部材
１１……底部材の周縁部
１２……底部材
１５……胴部貼り合わせ部
１６……環状脚部
２０……カツプ状の紙容器
２２……切り欠き部
ｔ ……トップカール
ｄ ……段差
ｋ ……接合部
４０……基材シート
４１……ポリエチレン層
４２……ブランクス
４５……胴部材
４６……底部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper container composed of a base sheet mainly made of paper, and more particularly to a paper container using a cylindrical body member and a bottom member. For example, the paper is placed at a location where contents such as a filled liquid material come into contact. The present invention relates to a paper container having a structure in which an end face is not exposed.
[0002]
[Prior art]
Conventionally, a paper container formed by using a container forming blank made of a base sheet mainly made of paper, for example, one end of a body forming blank is overlapped with the other end, and the body is pasted. A cylindrical body member is formed by forming a mating portion, and a bottom member is attached to the lower part of the body member, such as cup-shaped or cylindrical (can-shaped) paper containers, food containers such as beverages and confectionery It is widely known that it is used in various fields.
[0003]
In these containers, as shown in FIG. 5, conventionally, cup forming blanks (42) made of a paper base sheet (40) coated with polyethylene resin (41) on both sides are rounded into a cylindrical shape, The body edges (45) of the paper cup are formed by applying heat pressure to the overlapped edges and welding them. Furthermore, a bottom member (46) is fitted into the lower part of the body part, a part of the lower part of the body part is bent inward to fix the bottom member, and the edge of the top part of the paper cup is rounded outward to form a top curl (t). A cup-shaped paper container is formed.
[0004]
However, the cut surface (end surface) of the paper base sheet is exposed inside the joint portion (k) of the body member, and contact with the end surface of the contents (penetration into the paper) and gas permeation cannot be prevented. Can not. Therefore, although not shown, half the thickness of the paper base sheet is scraped (skived) by a predetermined length from the tip inside the joint, and the other half is folded back (hemming) so that the deleted surface is inside. In order to prevent the cut surface (end surface) of the paper from being exposed, or as another method not to expose the end surface of the paper, contact the end surface of the contents (paper Measures to prevent gas permeation) and gas permeation.
[0005]
[Problems to be solved by the invention]
In these methods, skive hemming of the edge of the base sheet requires a complicated processing process by a special machine, and the scraped paper dust adheres to the container and mixes with the contents. There was a problem. In addition, the method of attaching the tape-shaped member requires a tape that is a separate member, and requires a device for attaching, which causes problems such as complicated processes. Furthermore, a particularly problematic point is that the skive hemming process and the method of pasting the tape-like member increase the thickness of the joint (k) of the barrel member, and as shown in FIG. A step (d) occurs at the top curl portion of the top portion of the top portion, and the joint portion is a double paper base sheet in the bent portion for fixing the bottom member (46) at the lower portion of the body portion. However, there is a problem that the sealing performance of the container is deteriorated, for example, the fixing of the bottom member is not stable.
[0006]
Therefore, the present invention has been made to solve the above problem, and is a method of performing an end surface treatment inside the body bonding portion without complicated processing steps, and can protect the end surface of the paper. To provide a paper container.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 of the present invention is a paper container formed by using a container forming blank made of a base sheet mainly composed of paper, and the base material is formed on both opposing edges of the container forming blank. An edge extending piece formed by extending a predetermined width along the edge of the thermoplastic resin layer laminated on the sheet is provided, so that the paper portions of the base sheet do not overlap with each other. A paper container characterized in that both end portions are overlapped so that the edge extending piece is inside the paper container and the other edge extending piece is outside, and the respective edge extending pieces are thermocompression-bonded. It is.
[0008]
In the invention according to claim 2 of the present invention, one end of a container-forming blank made of a base sheet made mainly of paper is overlapped with the other end to form a body part lamination. A heat-resistant resin layer laminated on a base material sheet at both edges of the body blanks. Is provided with an edge extending piece formed by extending a predetermined width along the edge so that the paper portions of the base sheet do not overlap with each other, and one edge extending piece is a paper container. The end of the base sheet is coated by superimposing both ends so that the other edge extending piece is outside the paper container and thermocompression-bonding each edge extending piece inside It is a paper container characterized by having.
[0009]
Further, in the invention according to claim 3 of the present invention, a thermosetting resin layer is laminated on both the front and back surfaces of the base sheet, and each thermosetting resin layer is extended by a predetermined width along the both edges. An edge extending piece is provided, and the edge is covered by bonding the overlapping edge extending pieces together. A paper container according to any one of the above.
[0010]
In the present invention, the base sheet can include a barrier layer. Or a barrier layer can be laminated | stacked on a base material sheet.
The barrier layer is any one of a metal foil, a metal vapor deposition film, and a metal compound vapor deposition film.
[0011]
In the present invention, an elongated U-shaped notch is formed at both end edges of the base sheet, and an edge extending piece is provided at the notch portion.
[0012]
The invention according to claim 8 of the present invention is a manufacturing method in which a container forming blank is punched or cut out from a base sheet mainly composed of paper, and a paper container is formed using the paper container forming blank. A step of providing a punching hole adjacent to both opposing edge positions of the container forming blanks, and a step of laminating a thermoplastic resin layer on the base sheet so as to cover at least the punching hole. Forming a thermoplastic resin layer formed so as to cover the punched hole by punching or cutting out container forming blanks so as to form an edge extending piece having a predetermined width outside the edge; And a step of forming the blank for forming a container into a container shape.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Below, the paper container of this invention is demonstrated in detail based on one Embodiment of cup shape.
[0014]
As shown in FIGS. 1 and 2, one embodiment of the present invention includes a body-laminated portion by attaching both end edges (3, 3) of a fan-shaped body-forming blank (8) that is a container-forming blank. (15) is formed, and a cylindrical body member (10) tapering downward is formed. Further, the peripheral portion (11) is erected downward to form a substantially circular bottom member (12), and the inner surface of the peripheral portion (11) of the bottom member is joined to the lower inner surface of the body member (10). The lower end edge of the body member is folded inward so as to cover the periphery, and joined to the outer surface of the periphery of the bottom member (12) to form an annular leg (16), and then the upper periphery of the body member is formed. It is a paper container (20) which is wound around and forms a top curl (t).
[0015]
The paper cup structure in the present invention has a thermoplastic resin layer (2, 2) that wraps the fan-shaped body forming blanks (8), which is a container forming blank made of a base sheet (1) mainly composed of paper, from both sides. 2) From a polyethylene resin or the like obtained by extending a thermoplastic resin layer laminated on the base material sheet along a both-side edge of the fan-shaped body forming blanks (8). The edge extension piece (5, 5) by the thermoplastic resin layer which becomes is provided. Laminate the edges (3, 3) of the paper portion of the base sheet so that they do not overlap, and one edge extending piece (5) is inside the paper container and the other edge extending piece (5 ) Is formed by stacking the end extension pieces (5, 5) so that the outer end extension pieces (5, 5) are on the outside, and by joining the end extension pieces to each other by thermocompression bonding. The trunk member (10) is obtained.
[0016]
Furthermore, as shown in FIG. 3, the peripheral edge (11) is erected downward to form a substantially circular bottom member (12), and the peripheral edge (11) of the bottom member is formed on the lower inner surface of the body member (10). The lower end edge of the body member is folded inward so as to cover the periphery, and the outer periphery of the bottom member (12) is joined to form an annular leg (16). Next, there is a paper container (20) in which the upper peripheral edge of the body member is wound outward to form a top curl (t).
Therefore, this paper container has an edge extending piece formed by extending a thermal resin layer laminated on the base sheet on the both edges of the body blanks by a predetermined width along this edge. Both ends so that the paper portion of the base sheet does not overlap, and one edge extension piece is inside the paper container and the other edge extension piece is outside the paper container. The paper containers covered with the edge (3, 3) of the base sheet and the bonded portion are obtained by overlapping the portions and thermocompression-bonding the respective edge extending pieces.
[0017]
Next, another embodiment of the present invention will be described. As shown in FIG. 4, U-shaped notches (22, 22) are provided at both ends of the fan-shaped drum forming blank (8). In the same manner as described above, a thermoplastic resin layer (2, 2) made of polyethylene or the like is provided on both the front and back surfaces of the base sheet (1), including a U-shaped notch. The edge extending pieces (5, 5) are provided so as to cover them. Further, when the U-shaped notch is formed, it is preferably formed by removing the annular leg portion (16) at the lower portion of the body member and the top curl (t) at the upper portion.
The portion of the thermoplastic resin layer in the notch is an edge extending piece, and the edge extending pieces (5, 5) covering the U-shaped notch are overlapped and thermocompression bonded. Thus, a paper container in which the edge (3, 3) of the base sheet and the inner and outer base sheet end faces of the bonded portion are coated is obtained.
[0018]
Next, the thermoplastic resin layers (2, 2) are laminated on the front and back surfaces of the base sheet (1) by a known method such as a dry lamination method or a melt extrusion coating method.
[0019]
In addition, the U-shaped notch can be easily formed by punching, but depending on the shape of the blank, it can also be formed by slitting or cutting. The width of the U-shaped notches (22, 22) is preferably about 2 to 10 mm.
[0020]
Moreover, it is preferable that the width | variety of the edge extension extending piece (5, 5) by a thermoplastic resin layer (2, 2) shall be about 1 mm-10 mm irrespective of the presence or absence of a notch part.
[0021]
Although not shown, the base material sheet (1) used in the present invention can be provided with a barrier layer. As a barrier layer, a thin film of a metal such as aluminum or an inorganic compound such as aluminum oxide or silicon oxide is deposited on a stretched film such as a uniaxially or biaxially stretched polyethylene terephthalate film, a polyamide film or a polyolefin film. An inorganic compound vapor-deposited plastic film provided with a thickness of about 20 to 100 nm by a vapor deposition method such as the above can be used. Especially, the vapor deposition film which vapor-deposited the thin film of the metal thru | or the inorganic compound on the polyethylene terephthalate film can use it more preferably.
[0022]
Moreover, well-known barrier materials, such as metal foils, such as aluminum foil, ethylene-vinyl acetate copolymer, a polyvinylidene chloride, can also be employ | adopted.
[0023]
The barrier layer may be a resin layer comprising a film containing a water-soluble resin and an inorganic layered compound, or a film obtained by reacting a metal alkoxide or a hydrolyzate thereof with an isocyanate compound. Furthermore, the said barrier layer can be made into a different body from a base material sheet (1), and can be laminated | stacked on a base material sheet.
[0024]
A cup-shaped paper container can be obtained from the body member and the bottom member thus produced by a known molding machine.
The obtained cup-shaped paper container has a thickness of the bonded portion of the body portion equivalent to that of the base sheet, and further, there is no step in the upper opening, and can be sealed with a heat seal lid or the like.
[0025]
The body forming blanks (8) are not necessarily fan-shaped and are not shown, but may be rectangular or square, for example. In this case, a cylindrical paper container having substantially the same diameter at the top and bottom can be formed.
[0026]
In the above-described embodiment, the thermoplastic resin layers are provided on both surfaces of the base sheet (1) to cover the edge of the sheet. However, the present invention is not limited, and is provided on one surface of the base sheet. It is also possible to cover the edge only by the thermoplastic resin layer (2).
[0027]
The edge covered with the thermoplastic resin layer (2) is generally an edge located on the inner surface side of the container. However, in the paper container of the present invention, the container is covered by covering the front and back sides. Among them, since the edge of the outer surface can be protected, it can be adopted as a container used around water, such as a kitchen, a washroom, and a bathroom.
[0028]
Although not shown, the container can be sealed not only at the edge of the body bonding portion but also at the other edge, for example, the lower edge bent inside the body member. .
[0029]
【The invention's effect】
Since this invention is the above structure, there exist the following effects.
That is, the paper container of the present invention extends the thermoplastic resin layer so as not to expose the end edge (end face) of the base sheet at the body portion bonding portion, and forms an end extension piece to form the end edge. Since it protects, it is a container excellent in moisture barrier properties and gas barrier properties. Further, according to the method for protecting an end face of the present invention, a separate member such as a protective tape is unnecessary, and the manufacturing process is easy.
[0030]
In addition, compared to conventional edge protection methods such as skive hemming and tape application, there is no overlap of the end portions of the body member, and the entire cup is connected by joining the extended edges of the thermoplastic resin layer. The thickness becomes uniform, and the thickness of the step of the container itself and the bending of the lower part of the body member when the bottom member is fixed do not increase. Accordingly, when the container is sterilized, the sterilizing liquid easily rotates, so that the sterilization is easy to perform, the drying is also easy to perform, and the residual sterilizing liquid can be reduced.
[0031]
Moreover, since the paper container of the present invention can protect all the outer edges of the inside of the container, it can be used as a container used around water in a kitchen, a bathroom, a bathroom, etc., for example. There is an effect.
[Brief description of the drawings]
FIG. 1 shows a member for forming a paper container in an embodiment of the present invention, wherein (A) shows blanks covered with a thermoplastic resin and provided with edge extending pieces at both ends, (B) These are explanatory drawings seen from this side.
FIGS. 2A and 2B show a paper container forming process using the above-described members. FIG. 2A shows a body member to which the blanks are bonded, FIG. 2B shows this bottom member, and FIG. 2C shows a completed cup shape. It is sectional drawing of this paper container.
FIGS. 3A and 3B show a bonding portion in a trunk portion of a completed cup-shaped paper container according to the present invention, wherein FIG. 3A is a cross-sectional view of the cup-shaped paper container, and FIG. It is a cross-sectional explanatory drawing which shows the welding state of the edge extension extending pieces in.
FIG. 4 is a plan view showing a state in which a U-shaped notch and an edge extending piece are provided at both ends of a fan-shaped blank in another embodiment of the present invention.
FIG. 5 is an explanatory view showing a conventional paper cup manufacturing process.
6A and 6B show problems in a conventional paper cup, in which FIG. 6A is a step around a body portion, and FIG. 6B is an explanatory diagram showing a difference in thickness at a bottom fixing body portion.
[Explanation of symbols]
1 ... Base material sheet 2 ... Thermoplastic resin layer 3 ... Edge (end face) of base material sheet
5 ... Edge extending piece 8 ... Blanks 10 ... Body member 11 ... Peripheral part 12 of bottom member ... Bottom member 15 ... Body part bonding part 16 ... Ring-shaped leg part 20 ... Cup-shaped Paper container 22 ... Notch t ... Top curl d ... Step k ... Joint 40 ... Base sheet 41 ... Polyethylene layer 42 ... Blanks 45 ... Body member 46 ... Bottom member

Claims (8)

紙を主体とする基材シートからなる容器形成用ブランクスを用いて形成される紙容器であって、容器形成用ブランクスの対向する両端縁に、基材シート上に積層された熱可塑性樹脂層を、前記端縁に沿って所定幅延設してなる端縁延設片が設けられており、前記基材シートの紙部分が重ならないように、かつ一方の端縁延設片が紙容器の内側に、他方の端縁延設片が外側にくるように両端部を重ね合わせ、各々の端縁延設片どうしを熱圧着したことを特徴とする紙容器。A paper container formed using a container-forming blank consisting of a base sheet mainly composed of paper, and a thermoplastic resin layer laminated on the base sheet on opposite opposite edges of the container-forming blank. An edge extending piece extending a predetermined width along the edge, so that the paper portions of the base sheet do not overlap and one edge extending piece is a paper container A paper container, wherein both end portions are overlapped so that the other edge extending piece is on the inside, and the respective edge extending pieces are thermocompression-bonded. 紙を主体とする基材シートからなる容器形成用ブランクスの一方の端縁をもう一方の端縁に重ね合わせて胴部貼り合わせを形成させて筒状の胴部材とし、該胴部材の下部に底部材を取り付けてなる紙容器であって、前記胴部ブランクスの両方の端縁に、基材シート上に積層された熱可性樹脂層を前記端縁に沿って所定幅延設してなる端縁延設片が設けられており、前記基材シートの紙部分が重ならないように、かつ一方の端縁延設片が紙容器の内側に、他方の端縁延設片が紙容器の外側にくるように両端部を重ね合わせ、各々の端縁延設片どうしを熱圧着することにより基材シートの端縁が被覆されていることを特徴とする紙容器。A cylindrical body member is formed by overlapping one end of a container-forming blank consisting of a paper-based substrate sheet with the other end to form a body part, and at the bottom of the body member A paper container to which a bottom member is attached, and is formed by extending a thermal resin layer laminated on a base material sheet to a predetermined width along the edge at both edges of the body blank. An edge extension piece is provided, so that the paper portions of the base sheet do not overlap, and one edge extension piece is inside the paper container and the other edge extension piece is the paper container. A paper container characterized in that both ends are overlapped so as to come to the outside, and the edge of the base sheet is covered by thermocompression bonding of the respective edge extending pieces. 前記基材シートの表裏両面に熱可性樹脂層が積層され、それぞれの熱可性樹脂層を前記両方の端縁に沿って所定幅延設してなる端縁延設片が設けられると共に、この重なりあった端縁延設片同志を接着することにより、前記端縁が被覆されていることを特徴とする請求項１または請求項２のいずれかに記載の紙容器。A thermosetting resin layer is laminated on both the front and back surfaces of the base sheet, and provided with edge extending pieces each having a predetermined width extending along the both edges of the thermosetting resin layers, The paper container according to claim 1, wherein the edge is covered by adhering the overlapping edge extending pieces. 前記基材シートが、バリア層を含むことを特徴とする請求項１乃至請求項３のいずれかに記載の紙容器。The paper container according to any one of claims 1 to 3, wherein the base sheet includes a barrier layer. 前記基材シート上に、バリア層を積層することを特徴とする請求項１乃至請求項４のいずれかに記載の紙容器。The paper container according to any one of claims 1 to 4, wherein a barrier layer is laminated on the base sheet. 前記バリア層が金属箔、金属蒸着フィルム、金属化合物蒸着フィルムのいずれかであることを特徴とする請求項１乃至請求項４のいずれかに記載の紙容器。The paper container according to any one of claims 1 to 4, wherein the barrier layer is any one of a metal foil, a metal vapor deposition film, and a metal compound vapor deposition film. 前記基材シートの端縁に細長いコ字状の切り欠きを形成し、この切り欠き部分に端縁延設片が設けられていることを特徴とする請求項５または請求項６のいずれかに記載の紙容器。7. An elongated edge-shaped notch is formed in an edge of the base sheet, and an edge extending piece is provided in the notch portion. The paper container described. 紙を主体とする基材シートから容器形成用ブランクスを打ち抜き或いは切り出し形成し、該紙容器形成用ブランクスを用いて紙容器を形成する製造方法であって、前記容器形成用ブランクスの対向する両方の端縁となる位置に隣接して打ち抜き孔を設ける工程と、少なくとも該打ち抜き孔を覆うように基材シート上に熱可塑性樹脂層を積層する工程と、前記打ち抜き孔を覆って形成された熱可塑性樹脂層を、前記端縁の外方に所定の幅の端縁延設片を形成するように容器形成用ブランクスを打ち抜き或いは切り出して形成する工程と、該容器形成用ブランクスを容器形状に成形する工程とを含むことを特徴とする紙容器の製造方法。A manufacturing method of punching or cutting out a container forming blank from a base sheet mainly composed of paper, and forming a paper container using the paper container forming blank, both of the container forming blanks facing each other A step of providing a punching hole adjacent to the edge position, a step of laminating a thermoplastic resin layer on the base sheet so as to cover at least the punching hole, and a thermoplastic formed covering the punching hole. Forming a resin layer by punching out or cutting out a container forming blank so as to form an edge extending piece having a predetermined width outside the edge; and forming the container forming blank into a container shape And a process for producing a paper container.
JP2003182433A 2003-06-26 2003-06-26 Paper container Pending JP2005014975A (en)

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