JP4617791B2

JP4617791B2 - Processing method for end face of paper container and paper cup barrel member

Info

Publication number: JP4617791B2
Application number: JP2004270979A
Authority: JP
Inventors: 順佐久間; 谷口　　正幸
Original assignee: Toppan Inc
Current assignee: Toppan Inc
Priority date: 2004-02-26
Filing date: 2004-09-17
Publication date: 2011-01-26
Anticipated expiration: 2024-09-17
Also published as: JP2005272010A

Description

本発明は、紙容器と紙カップに関するものであり、特には、製造工程が比較的簡単で、液状物等の内容物が接触する個所に紙端面が露出しない構造の紙容器と紙カップ並びに該紙容器と紙カップの製造方法に関する。 TECHNICAL FIELD The present invention relates to a paper container and a paper cup, and in particular, a paper container and a paper cup having a structure in which the manufacturing process is relatively simple and the end face of the paper is not exposed at a place where the contents such as a liquid material contact, and the paper container And a paper cup manufacturing method.

ジュース等の飲料を充填し、上部の開口部を蓋材で密封して使用するバリア性に優れた紙カップは、例えば、表側から、ポリエチレン／紙／ポリエチレン／アルミニウム箔／ポリエチレンテレフタレートフィルム／ポリエチレンからなる積層シートで成形されているのが一般的であった。 A paper cup that is filled with beverages such as juice and that has an upper opening sealed with a lid and has excellent barrier properties is composed of, for example, polyethylene / paper / polyethylene / aluminum foil / polyethylene terephthalate film / polyethylene from the front side. In general, it is formed of a laminated sheet.

そしてバリア性を必要とするため、例えば、紙カップの胴部を構成する胴部材の接合部分の内側は、先端から所定の長さだけ、積層シートの厚みの半分を削除（スカイブ）し、削り取った残りの半分を削除面が内側になるように折り返し（ヘミング）、紙端面の保護を行っている。 In order to require barrier properties, for example, the inside of the joint part of the body member constituting the body part of the paper cup is scraped by removing half of the thickness of the laminated sheet by a predetermined length from the tip (skive). The other half is folded (hemming) so that the deleted surface is on the inside, and the edge of the paper is protected.

しかしながら、上述の紙端面のスカイブヘミング加工を行うためには、あらかじめ打ち抜いたブランクを紙カップに成形する前に、特別の機械を用いて紙端面のスカイブヘミング加工をする必要があり、そのため複雑な加工工程を経ねばならず、また、紙粉発生の面からも改善が要望されていた。 However, in order to perform the above-mentioned skive hemming on the paper end surface, it is necessary to perform a skive hemming process on the paper end surface using a special machine before forming a blank punched into a paper cup. There has been a demand for improvement in terms of paper dust generation.

スカイブヘミング加工を行わずにバリア性に優れた紙カップを作製する方法として、端面がフィルムで覆われたブランクから紙カップを製造する方法が提案されている（例えば、特許文献１参照）。
特公昭５８−４３２６４号公報（請求項１）。 As a method of producing a paper cup having excellent barrier properties without performing skive hemming, a method of producing a paper cup from a blank whose end face is covered with a film has been proposed (for example, see Patent Document 1).
Japanese Patent Publication No. 58-43264 (Claim 1).

しかし、このバリア性を有する紙カップにおいては、胴部貼り合わせ部の内側の端縁は全体にわたって熱可塑性樹脂層が紙基材からはみ出して作製されているため、この紙基材からはみ出した熱可塑性樹脂層のフィルムがカップ成形する際に，不規則に成形されてしまい、本来の目的である紙端面の被覆に支障をきたしたり、紙カップとしての仕上がりが外観的に悪くなってしまう等の問題がある。
また、スカイブ端面を一直線上にそろえるため、カップ成形機でスカイブヘミング加工をすると同時にカップ成形をすることは困難であった。 However, in the paper cup having this barrier property, the inner edge of the body bonded portion is formed by the thermoplastic resin layer protruding from the paper base material as a whole. When the film of the resin layer is formed into a cup, there are problems such as irregular formation of the resin layer, hindering the original purpose of covering the end face of the paper, and deterioration of the appearance of the paper cup. is there.
In addition, since the skive end faces are aligned, it is difficult to perform cup molding simultaneously with skive hemming with a cup molding machine.

本発明は、一方の端縁に熱可塑性樹脂層からなるフィルムがはみだして形成されている胴部材を用いてバリア性に優れた容器を成形する際に発生する以上のような問題に鑑みてなされたもので、紙端面の被覆に支障をきたさず、かつ、紙カップとしての仕上がり外観の綺麗なバリア性を有する紙カップ等の紙容器と該紙カップや紙容器をロール状の紙基材から直接紙カップや紙容器にする紙容器と紙カップの作製方法を提供することを課題とする。 The present invention has been made in view of the above-described problems that occur when a container having excellent barrier properties is formed using a body member formed with a film made of a thermoplastic resin layer protruding from one edge. The paper cup such as a paper cup and the like that does not interfere with the coating of the paper end surface and has a clean appearance as a paper cup and the paper cup or paper container directly from the roll-shaped paper substrate It is an object of the present invention to provide a method for manufacturing a paper container and a paper cup to be a paper container.

本発明の請求項１の発明は、少なくとも内側面に熱可塑性樹脂層が設けられた紙を基材とする積層シートから構成され、ブランク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し、該胴部材の上部と下部の開口部をそのまま又は折り畳んで熱融着させた紙容器において、前記ブランクの一方の端縁は、内面側の熱可塑性樹脂層が紙基材より所定幅はみ出して端縁保護樹脂層が形成され、前記端縁保護樹脂層は紙基材の端部近傍で外側に折り返されて、紙基材端面が被覆され、ブランクのもう一方の端縁の内面側に密着して貼り合わされて、前記紙基材と熱可塑性樹脂層の間にバリア層を設けてあり、前記ブランクの端縁保護樹脂層を紙容器の内面側より外面側に向けて櫛状の第１部材で略９０°の角度に押し曲げ、ついで押し曲げた端縁保護樹脂層を紙容器の外側方向より内側方向に向けて略９０°の角度に櫛状の第２部材で押し曲げ、最後に押し曲げた端縁保護樹脂層を紙容器の外側方向より内側方向に向けて櫛状の第３部材を押しつけて、端縁保護樹脂層をブランクの紙基材の端面に仮接着させたことを特徴とする、紙容器の端面の処理方法である。
The invention of claim 1 of the present invention is composed of a laminated sheet based on a paper having a thermoplastic resin layer provided on at least an inner surface, and one end of a blank is overlapped with the other end. In the paper container in which the body part bonded portion is formed to form a cylindrical body member, and the upper and lower openings of the body member are directly or folded and heat-sealed, one edge of the blank is an inner surface The side thermoplastic resin layer protrudes from the paper base by a predetermined width to form an edge protection resin layer, and the edge protection resin layer is folded outward in the vicinity of the edge of the paper base. Covered and adhered to the inner surface side of the other edge of the blank, and a barrier layer is provided between the paper base material and the thermoplastic resin layer, and the edge protection resin layer of the blank is coated with paper. Approximately 90 ° with the comb-shaped first member from the inner surface side to the outer surface side of the container The edge protection resin layer that has been pushed and bent at an angle, and then pushed and bent by a comb-like second member at an angle of about 90 ° from the outer side to the inner side of the paper container, and finally pushed and bent to protect the edge. A paper container, wherein the edge-protecting resin layer is temporarily bonded to an end surface of a blank paper substrate by pressing the comb-shaped third member with the resin layer directed inward from the outer side of the paper container. It is the processing method of the end surface of .

このように請求項１記載の発明によれば、ブランクの一方の端縁は、少なくとも内面側の熱可塑性樹脂層が紙基材より所定幅はみ出して端面保護樹脂層が形成され、前記端面保護樹脂層は紙基材の端部近傍で外側に折り返されて紙基材端面が被覆され、ブランクのもう一方の端縁の内面側に密着された状態で貼り合わされているので、紙容器に成形した際、容器内側の胴部貼り合わせ部の紙端面は端面保護樹脂層に綺麗に被覆されており内容物が紙端面に接触することがない。 Thus, according to the first aspect of the invention, at least one thermoplastic resin layer on the inner surface side protrudes a predetermined width from the paper base to form an end surface protective resin layer on one end edge of the blank, and the end surface protective resin is formed. The layer is folded outward near the edge of the paper substrate, covered with the paper substrate end surface, and bonded to the inner surface of the other edge of the blank, so it was molded into a paper container. At this time, the paper end surface of the body laminating portion inside the container is neatly covered with the end surface protective resin layer, and the contents do not come into contact with the paper end surface.

このように請求項１記載の発明によれば、紙基材と熱可塑性樹脂層の間にバリア層が設けられ胴部貼り合わせ部で紙基材の端部がバリア層で被覆されるので、バリア性に優れた紙容器を作製することができる。Thus, according to the invention described in claim 1, since the barrier layer is provided between the paper base material and the thermoplastic resin layer, and the end portion of the paper base material is covered with the barrier layer at the body portion bonding portion, A paper container excellent in barrier properties can be produced.

このように請求項１記載の発明によれば、ブランクの端縁保護樹脂層を紙容器の内面側より外面側に向けて櫛状の第１部材で略９０°の角度に押し曲げ、ついで押し曲げた端縁保護樹脂層を紙容器の外側方向より内側方向に向けて略９０°の角度に櫛状の第２部材で押し曲げ、最後に押し曲げた端縁保護樹脂層を紙容器の外側方向より内側方向に向けて櫛状の第３部材を押しつけて、端縁保護樹脂層をブランクの紙基材の端面に仮接着させているので、ブランク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際、一方の端縁に形成された端縁保護樹脂層は紙基材に固定さ
れており綺麗に安定した胴部貼り合わせ部を形成することができる。
As described above, according to the first aspect of the invention, the edge protection resin layer of the blank is pushed and bent at an angle of approximately 90 ° by the comb-shaped first member from the inner surface side to the outer surface side of the paper container, and then pressed. The bent edge protection resin layer is pushed and bent by the second comb-shaped member at an angle of approximately 90 ° from the outer side to the inner side of the paper container, and finally the bent edge protection resin layer is pushed to the outside of the paper container. Since the edge-protecting resin layer is temporarily bonded to the end surface of the blank paper base by pressing the comb-shaped third member from the direction toward the inner side, one end of the blank is connected to the other end When forming a cylindrical body member by overlapping the body part, the edge protection resin layer formed on one edge is fixed to the paper substrate.
Therefore, it is possible to form a torso bonded portion that is clean and stable.

また、請求項２の発明は、少なくとも内側面に熱可塑性樹脂層が設けられた紙を基材とする積層シートから構成され、胴部材ブランク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円筒形状の胴部材とし、ほぼ円形状の底紙の周縁部を下向きに起立させて底部材とし、前記胴部材の下部内面に底部材の周縁部の内面を接合させ、さらに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、底部材の周縁部外面に接合させて環状脚部を形成させ、胴部材の上部周縁を外方に巻き込み口縁部を形成させた紙カップにおいて、前記胴部貼り合わせ部の胴部材ブランクの一方の端縁は、少なくとも内面側の熱可塑性樹脂層が紙基材より所定幅はみ出して端縁保護樹脂層が形成され、前記端縁保護樹脂層は紙基材の端部近傍で折り返されて、紙基材端面が被覆され、胴部材ブランクのもう一方の端縁の内面側に密着されて胴部貼り合わせ部が形成され、前記紙基材と熱可塑性樹脂層の間にバリア層を設けてあり、前記胴部材ブランクの端縁保護樹脂層を紙カップの内面側より外面側に向けて櫛状の第１部材で略９０°の角度に押し曲げ、ついで押し曲げた端縁保護樹脂層を胴部材ブランクの外側方向より内側方向に向けて略９０°の角度に櫛状の第２部材で押し曲げ、最後に押し曲げた端縁保護樹脂層を胴部材ブランクの外側方向より内側方向に向けて櫛状の第３部材を押しつけて、端縁保護樹脂層を胴部材ブランクの紙基材の端面に仮接着させたことを特徴とする、紙カップ胴部材の端面の処理方法である。
Further, the invention of claim 2 is composed of a laminated sheet based on paper having a thermoplastic resin layer provided on at least the inner surface, and one end of the body member blank is overlapped with the other end. Forming a cylinder bonded portion to form a cylindrical body member, with the peripheral edge of a substantially circular bottom paper standing downward to form a bottom member, and the inner surface of the peripheral edge of the bottom member on the lower inner surface of the body member The lower end edge of the body member is bent inward so as to cover the periphery, and joined to the outer surface of the periphery of the bottom member to form an annular leg, and the upper periphery of the body member is wound outward. In the paper cup formed with the lip portion, one end edge of the body member blank of the body portion bonding portion has at least an inner surface side thermoplastic resin layer protruding from the paper base by a predetermined width so that the edge protection resin layer is formed. The edge protection resin layer is formed on the edge of the paper substrate. Is folded in the vicinity of, the coated paper substrate end face, in close contact with the other on one end the inner side of the rim to part bonded body of the cylinder member blank is formed, between the paper substrate and the thermoplastic resin layer A barrier layer is provided, and the edge protective resin layer of the body member blank is bent at an angle of approximately 90 ° with a comb-shaped first member from the inner surface side to the outer surface side of the paper cup, and then the bent edge The edge protective resin layer is pushed and bent by a second comb-like member at an angle of about 90 ° from the outer side of the body member blank toward the inner side, and finally the edge protection resin layer is pushed and bent toward the outer side of the body member blank. A method for treating an end face of a paper cup barrel member, wherein the edge-protecting resin layer is temporarily bonded to the end face of the paper base of the barrel member blank by pressing the comb-shaped third member toward the inner side. It is.

このように請求項２記載の発明によれば、胴部貼り合わせ部の胴紙の一方の端縁は、少なくとも内面側の熱可塑性樹脂層が紙基材より所定幅はみ出して端縁保護樹脂層が形成され、前記端縁保護樹脂層は紙基材の端部近傍で折り返されて、紙基材端面が被覆され、胴部材ブランクのもう一方の端縁の内面側に密着されて胴部貼り合わせ部が形成されているので、紙カップに成形した際、紙カップ内側の胴部貼り合わせ部の紙端面は端縁保護樹脂層に綺麗に被覆されており内容物が紙端面に接触することがない。
Thus, according to the second aspect of the present invention, at one end edge of the body paper of the body portion bonding portion, at least the inner side thermoplastic resin layer protrudes from the paper base by a predetermined width, and the edge protection resin layer The edge protection resin layer is folded back in the vicinity of the end of the paper base, and the end face of the paper base is covered, and is in close contact with the inner surface of the other end of the body member blank. Since the mating part is formed, when the paper cup is molded, the paper end surface of the body laminating part inside the paper cup is neatly covered with the edge protection resin layer so that the contents do not contact the paper end surface. .

このように請求項２記載の発明によれば、紙基材と熱可塑性樹脂層の間にバリア層が設けられ胴部貼り合わせ部で紙基材の端部がバリア層で被覆されるので、バリア性に優れた紙カップを作製することができる。
Thus, according to the invention of claim 2, since the barrier layer is provided between the paper base material and the thermoplastic resin layer, and the end portion of the paper base material is covered with the barrier layer at the body bonding portion, A paper cup having excellent barrier properties can be produced .

このように請求項２記載の発明によれば、胴部材ブランクの端縁保護樹脂層を紙カップの内面側より外面側に向けて櫛状の第１部材で略９０°の角度に押し曲げ、ついで押し曲げた端縁保護樹脂層を胴部材ブランクの外側方向より内側方向に向けて略９０°の角度に櫛状の第２部材で押し曲げ、最後に押し曲げた端縁保護樹脂層を胴部材ブランクの外側方向より内側方向に向けて櫛状の第３部材を押しつけて、端縁保護樹脂層を胴部材ブランクの紙基材の端面に仮接着させているので、胴部材ブランク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際、一方の端縁に形成された端縁保護樹脂層は紙基材に固定されており綺麗に安定した胴部貼り合わせ部を形成することができる。Thus, according to the invention described in claim 2, the edge protection resin layer of the body member blank is pushed and bent at an angle of about 90 ° by the comb-shaped first member from the inner surface side to the outer surface side of the paper cup, The edge-protecting resin layer that has been pushed and bent is bent by a second comb-shaped member at an angle of approximately 90 ° from the outer side to the inner side of the body member blank. The comb-shaped third member is pressed from the outer side of the blank toward the inner side, and the edge protection resin layer is temporarily bonded to the end surface of the paper base of the body member blank, so one end of the body member blank When a cylinder body member is formed by overlapping the edge with the other edge to form a cylindrical body member, the edge protection resin layer formed on one edge is fixed to the paper substrate. It is possible to form a beautiful and stable body bonded portion.

このように本発明によれば、ブランク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る前に、一方の端縁から所定幅はみ出している熱可塑性樹脂層を紙基材の端部近傍で折り返して紙基材に仮着させて端縁保護樹脂層としてあるので、容器に成形する際、端縁保護樹脂層が紙基材からはみ出しておらず綺麗な成形ができ、酸素バリア性、水蒸気バリア性などの物性品質の向上につながる。 As described above, according to the present invention, the thermoplastic resin layer protrudes from the one end edge by a predetermined width before one end edge of the blank is overlapped with the other end edge to form the body portion bonding portion. Is folded around the edge of the paper base material and temporarily attached to the paper base material to form an edge protection resin layer, so the edge protection resin layer does not protrude from the paper base material when molded into a container. Molding is possible, leading to improved physical properties such as oxygen barrier properties and water vapor barrier properties.

また、積層シートに複数個割りつけられたブランクを一枚ずつのブランクに打ち抜く際には、あらかじめ積層シートの不必要部分がカットされているので、端縁保護樹脂層を含むブランクを安定して打ち抜くことができ、品質向上につながる。 In addition, when punching a plurality of blanks assigned to the laminated sheet into blanks one by one, unnecessary parts of the laminated sheet are cut in advance, so that the blank including the edge protection resin layer can be stably Can be punched, leading to quality improvement.

本発明を一実施形態に基づいて以下に詳細に説明する。 The present invention will be described in detail below based on one embodiment.

本発明の紙カップは、例えば、図１〜図４に示すように、少なくとも内側面に熱可塑性樹脂層（２）が設けられた紙を基材（１）とする積層シート（３）から構成されている。 The paper cup of this invention is comprised from the laminated sheet (3) which makes the base material (1) the paper by which the thermoplastic resin layer (2) was provided in the inner surface at least as shown in FIGS. 1-4, for example. ing.

胴部材ブランク（１０）の一方の端縁（１１）をもう一方の端縁（１２）に重ね合わせて胴部貼り合わせ部（１５）を形成させて円筒形状の胴部材とし、ほぼ円形状の底紙を周縁部（２１）を下向きに起立させて底部材（２０）とし、前記胴部材の下部内面に底部材の周縁部の内面を接合させ、さらに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、底部材の周縁部外面に接合させて環状脚部（２２）を形成させ、胴部材の上部周縁を外方に巻き込み口縁部（１６）を形成させた紙カップである。 One end edge (11) of the body member blank (10) is overlapped with the other end edge (12) to form a body portion bonding portion (15) to form a cylindrical body member, which is substantially circular. The bottom paper is erected with the peripheral edge (21) facing downward to form the bottom member (20), the inner surface of the peripheral edge of the bottom member is joined to the lower inner surface of the body member, and the lower end of the body member is covered so as to cover the peripheral edge. A paper cup in which the edge is bent inward and joined to the outer peripheral surface of the bottom member to form the annular leg (22), and the upper peripheral edge of the body member is wound outward to form the mouth edge (16). is there.

そして、胴部材ブランク（１０）の一方の端縁（１１）は、少なくとも内面側の熱可塑性樹脂層（２）が紙基材（１）より所定幅はみ出して端縁保護樹脂層（４）が形成され、端縁保護樹脂層（４）は紙基材の端部近傍で折り返されて、紙基材端面（５）が被覆され、胴紙のもう一方の端縁（１２）の内面側に密着されて胴部貼り合わせ部（１５）が形成されていることを特徴としている。 The one end edge (11) of the body member blank (10) has at least the thermoplastic resin layer (2) on the inner surface side protruding from the paper base (1) by a predetermined width and the edge protection resin layer (4). The edge protection resin layer (4) is formed and folded in the vicinity of the edge of the paper substrate to cover the paper substrate edge (5), and on the inner surface of the other edge (12) of the linerboard It is characterized in that the body part bonding part (15) is formed in close contact.

このような構造を有している本発明の紙カップは、胴部貼り合わせ部（１５）の内側に位置する紙端面は端縁保護樹脂層（４）で保護されているので、内容物が紙端面から浸透することがない。また、複雑なスカイブヘミング加工によらずに紙端面の保護を行っているので、紙粉が紙カップに付着することもなく、収率の面でも改善が見られる。 In the paper cup of the present invention having such a structure, the end surface of the paper located inside the body portion bonding portion (15) is protected by the edge protection resin layer (4), so that the contents are paper. It does not penetrate from the end face. Further, since the paper end face is protected without complicated skive hemming, paper dust does not adhere to the paper cup, and an improvement in the yield can be seen.

紙基材（１）と熱可塑性樹脂層（２）の間にバリア層（２ａ）を介在させた構成とすることもできる（図５、図６、図７参照）。
バリア層（２ａ）を介在させることにより、バリア性に優れた紙カップにすることができる。 It can also be set as the structure which interposed the barrier layer (2a) between the paper base material (1) and the thermoplastic resin layer (2) (refer FIG.5, FIG.6, FIG.7).
By interposing the barrier layer (2a), a paper cup having excellent barrier properties can be obtained.

また、紙基材（１）の外側面にもポリエチレン等の熱可塑性樹脂層を設け、紙基材の両面に熱可塑性樹脂層を設けた構成とすることもできる。両面に熱可塑性樹脂層を設けた構成にすることにより、外側から水等の液体が付着しても紙基材の剛性が弱くなることがなく、耐水性に優れた紙カップにすることができる。
なお、このような構造は紙カップに限定されず、紙カップと同じような胴部貼り合わせ部を有する紙容器についても同様なことがいえる。 Moreover, it can also be set as the structure which provided the thermoplastic resin layer, such as polyethylene, also in the outer surface of the paper base material (1), and provided the thermoplastic resin layer on both surfaces of the paper base material. By adopting a configuration in which the thermoplastic resin layers are provided on both sides, even if a liquid such as water adheres from the outside, the rigidity of the paper substrate does not become weak, and a paper cup having excellent water resistance can be obtained.
Note that such a structure is not limited to a paper cup, and the same can be said for a paper container having a body bonding portion similar to a paper cup.

つぎにこのような紙カップの作製方法について、特に胴部材ブランクの作製方法を中心に詳細に説明する。 Next, a method for producing such a paper cup will be described in detail focusing on a method for producing a body member blank.

先ず、ロール状の紙基材（１）に扇形状の胴部材ブランク（１０）を複数個並べて割りつけ印刷すると共に、胴部材ブランクの一方の端縁（１１）にその端縁を含めて外方の部分を長窓（１３）として穿設する（図１（ａ），（ｂ）参照）〜第１打ち抜き工程。 First, a plurality of fan-shaped body member blanks (10) are arranged and printed on a roll-shaped paper base material (1), and one end edge (11) of the body member blank is included in the outer edge. This part is drilled as a long window (13) (see FIGS. 1A and 1B) to the first punching step.

胴部材ブランク（１０）を印刷して長窓（１３）が穿設された紙基材（１）の内側面にポリエチレン樹脂などの熱可塑性樹脂層（２）を溶融樹脂押し出し法により積層して、積層シート（３）を形成させると共に、紙基材の長窓部分に端縁保護樹脂層（４）を形成させる（図２（ａ），（ｂ）参照）〜熱可塑性樹脂貼り合わせ工程。 A body layer blank (10) is printed and a thermoplastic resin layer (2) such as polyethylene resin is laminated on the inner surface of the paper substrate (1) having a long window (13) perforated by a molten resin extrusion method. The laminated sheet (3) is formed, and the edge protection resin layer (4) is formed on the long window portion of the paper base (see FIGS. 2 (a) and (b)) to a thermoplastic resin bonding step.

あるいは、胴部材ブランク（１０）を印刷して長窓（１３）が穿設された紙基材（１）の内側面に、熱可塑性樹脂層（２）とバリア層（２ａ）を貼り合わせた複合フィルムを熱可塑性樹脂層を最内面にして積層して、積層シート（３）を形成させると共に、紙基材の長窓部分に端縁保護樹脂層（４）を形成させる（図２（ａ）、図５参照）〜熱可塑性樹脂貼り合わせ工程。 Alternatively, the thermoplastic resin layer (2) and the barrier layer (2a) are bonded to the inner side surface of the paper base (1) on which the long window (13) is formed by printing the trunk member blank (10). The composite film is laminated with the thermoplastic resin layer as the innermost surface to form a laminated sheet (3), and an edge protection resin layer (4) is formed on the long window portion of the paper substrate (FIG. 2 (a) ), See FIG. 5) to thermoplastic resin bonding step.

バリア層（２ａ）としては、アルミニウム箔、アルミニウム蒸着プラスチックフィルム、無機化合物蒸着プラスチックフィルム、エチレン−ポリビニルアルコール共重合体鹸化
物フィルム、層状化合物塗布プラスチックフィルム、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などが使用できる。 As the barrier layer (2a), aluminum foil, aluminum vapor-deposited plastic film, inorganic compound vapor-deposited plastic film, ethylene-polyvinyl alcohol copolymer saponified film, layered compound-coated plastic film, polyethylene terephthalate film, polyamide film and the like can be used.

積層シート（３）の紙基材（１）からはみ出して設けられた端縁保護樹脂層（４）を含む、長窓部分を形成させた側の胴部材ブランク（１０）の不必要部分（１４）を連続してカットする（図３（ａ），（ｂ）、図６参照）〜スクラップカット工程。 The unnecessary part (14) of the trunk | drum member blank (10) by which the long window part was formed including the edge protection resin layer (4) provided by protruding from the paper base material (1) of a lamination sheet (3) ) Is continuously cut (see FIGS. 3A, 3B, and 6) to a scrap cutting step.

片側の不必要部分（１４）が切り取られた積層シート（３）から印刷された複数個の扇形状の胴部材ブランク（１０）を打ち抜き、端縁保護樹脂層（４）を形成させた一枚ずつの胴部材ブランク（１０）を作製する〜第２打ち抜き工程。 One sheet formed by punching out a plurality of fan-shaped body member blanks (10) printed from a laminated sheet (3) from which an unnecessary part (14) on one side is cut off to form an edge protection resin layer (4) Each body member blank (10) is produced-a second punching step.

このような各工程を経て紙基材（１）より所定幅だけはみ出した端縁保護樹脂層（４）を一方の端縁に形成させた胴部材ブランク（１０）を作製することができる。 The body member blank (10) in which the edge protection resin layer (4) protruding from the paper base material (1) by a predetermined width through the respective steps is formed on one edge can be produced.

つぎに、この胴部材ブランク（１０）の端縁保護樹脂層（４）を紙基材端面（５）に仮着させる方法について、図８〜図９に沿って説明する。 Next, a method of temporarily attaching the edge protection resin layer (4) of the body member blank (10) to the paper base end face (5) will be described with reference to FIGS.

胴部材ブランク（１０）の紙基材（１）より所定幅だけはみ出した端縁保護樹脂層（４）を、紙カップに成形した際に内面側となる側より外面側となる側に向けて、押さえ突起（Ｄ１１）が櫛状に形成された第１部材（Ｄ１）を上方から下方に垂直方向に移動させて略９０°の角度に押し曲げ、仮折りする（図９（ａ），（ｂ）参照）。 When the edge protection resin layer (4) protruding from the paper base material (1) of the trunk member blank (10) by a predetermined width is formed into a paper cup, the side which becomes the outer surface side from the side which becomes the inner surface side, The first member (D1) in which the pressing protrusion (D11) is formed in a comb shape is moved vertically from the top to the bottom in the vertical direction and is bent and bent at an angle of about 90 ° (FIGS. 9A and 9B). )reference).

ついで、押さえ突起（Ｄ２１）が櫛状に形成された第２部材（Ｄ２）を、第１部材の押さえ突起（Ｄ１１）と押さえ突起（Ｄ１１）の間の間隙（Ｄ１２）を目掛けて胴部材ブランクの外側方向より内側方向に向けて水平移動させ、端縁保護樹脂層（４）を略９０°押し曲げ、端縁保護樹脂層（４）が胴部材ブランクの裏側の紙基材の端面（５）に覆い被さるように仮折りする（図９（ｃ）参照）。 Next, the second member (D2) in which the pressing protrusion (D21) is formed in a comb shape is placed on the body member with the gap (D12) between the pressing protrusion (D11) and the pressing protrusion (D11) of the first member. The edge protective resin layer (4) is pushed and bent by approximately 90 ° from the outer side of the blank toward the inner side, and the edge protective resin layer (4) is the end surface of the paper base on the back side of the body member blank ( 5) is temporarily folded so as to cover (see FIG. 9C).

最後に、第１部材の下側に配置され、押さえ突起（Ｄ３１）が櫛状に形成された第３部材（Ｄ３）を、垂直に上方に押しつけ圧着して端縁保護樹脂層（４）を胴部材ブランク（１０）の紙基材側に仮接着させる（図９（ｄ）参照）。なお、第３部材の押さえ突起（Ｄ３１）を適宜の温度に加熱しておくと端縁保護樹脂層の紙基材への接着性が向上してより効果的である。 Finally, the edge protection resin layer (4) is disposed by pressing the third member (D3), which is disposed below the first member and the pressing protrusion (D31) is formed in a comb-like shape, by pressing vertically upward. The body member blank (10) is temporarily bonded to the paper substrate side (see FIG. 9D). In addition, if the pressing protrusion (D31) of the third member is heated to an appropriate temperature, the adhesiveness of the edge protection resin layer to the paper substrate is improved, which is more effective.

このような方法により作製した胴部材ブランク（１０）を用いて紙カップに成形する成形方法の一例を簡単に説明する。 An example of a forming method for forming a paper cup using the body member blank (10) produced by such a method will be briefly described.

胴部材ブランクの端面処理を施した方の端縁（１１）を内面側にして、もう一方の端縁処理をしていない方の端縁に重ね合わせて胴部貼り合わせ部（１５）を形成させて円筒形状の胴部材とする。 The end (11) of the body member blank that has been subjected to the end surface treatment is formed on the inner surface side, and the other end edge of the body member blank is overlapped to form the body portion bonding portion (15). Let it be a cylindrical body member.

この胴部材の下部内面に、ほぼ円形状の底紙を周縁部（２１）を起立させた底部材（２０）の周縁部の内面を接合させ、さらに周縁部を覆うように胴部材の下端端部を内方に折り曲げ、底部材の周縁部外面に接合させて環状脚部（２２）を形成させる。 The bottom inner surface of the barrel member is joined to the lower inner surface of the barrel member by joining the inner surface of the peripheral portion of the bottom member (20) with the peripheral portion (21) upright with a substantially circular bottom sheet, and further covering the peripheral portion. The portion is bent inward and joined to the outer peripheral surface of the bottom member to form the annular leg (22).

最後に胴部材の上部周縁を外方に巻き込み口縁部（１６）を形成させ、本発明の紙カップとする。 Finally, the upper peripheral edge of the body member is rolled outward to form the mouth edge (16), thereby obtaining the paper cup of the present invention.

つぎに、紙容器の作製方法の一実施形態を、図１０〜図１３に従って説明する。 Next, an embodiment of a method for producing a paper container will be described with reference to FIGS.

先ず、ロール状の紙基材（３１) に所要寸法の略四角形状のブランク（３２）を複数個並べて割り付けると共に、前記各ブランクの一方の端縁（３３）からその端縁を含んだ外方の部分を長窓（３４）として穿設する（図１０（ａ），（ｂ）参照）〜第１打ち抜き工程。 First, a plurality of substantially square blanks (32) having required dimensions are arranged and allocated to a roll-shaped paper base material (31), and an outer side including the edge from one edge (33) of each blank. Is drilled as a long window (34) (see FIGS. 10A and 10B) to the first punching step.

長窓（３４）が穿設された紙基材の内側面に熱可塑性樹脂層（２）又は熱可塑性樹脂層（２）とバリア層（２ａ）を貼り合わせた複合フィルムを熱可塑性樹脂層（２）が最内面になるように積層して積層シート（３）を形成すると共に、長窓部分に端縁保護樹脂層（４）を形成する（図１１（ａ），（ｂ）、図１２参照）〜熱可塑性樹脂層貼り合わせ工程。 A thermoplastic resin layer (2) or a composite film in which the thermoplastic resin layer (2) and the barrier layer (2a) are bonded to the inner side surface of the paper base material in which the long window (34) is perforated is used. The laminated sheet (3) is formed so that 2) becomes the innermost surface, and the edge protection resin layer (4) is formed on the long window portion (FIGS. 11A, 11B, and 12). See)-Thermoplastic resin layer bonding step.

熱可塑性樹脂層が積層されたロール状の積層シートから略四角形状のブランクに所要の罫線加工を施すと共に、該ブランクを打ち抜き、端縁保護樹脂層（４）を形成させた一枚ずつの紙容器ブランク（３２）を作製する（図１３（ａ），（ｂ）参照）〜第２打ち抜き工程。 Each sheet of paper in which the required ruled line processing is performed on a substantially rectangular blank from a roll-shaped laminated sheet in which a thermoplastic resin layer is laminated, and the blank is punched to form an edge protection resin layer (4). A container blank (32) is produced (see FIGS. 13A and 13B) to a second punching step.

このような各工程を経て紙基材から所定幅だけはみ出した端縁保護樹脂層（４）を一方の端縁に形成させた紙容器ブランク（３２）を作製することができる。 A paper container blank (32) in which an edge protection resin layer (4) protruding from the paper base material by a predetermined width through each of these steps is formed on one edge can be produced.

略四角形状の紙容器ブランク（３２）の端縁保護樹脂層（４）を紙基材端面（５）に仮着させる方法は、図８，図９の扇形状の胴部材ブランクの場合と基本的には同じであるので省略する。 The method of temporarily attaching the edge protection resin layer (4) of the substantially rectangular paper container blank (32) to the paper substrate end face (5) is basically the same as the case of the fan-shaped body member blank of FIGS. Since they are the same, they are omitted.

端縁保護樹脂層（４）を紙基材端面（５）に仮着させた紙容器ブランク（３２）を、罫線の沿ってスリーブ状に折り曲げ、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し、胴部材の上部と下部の開口部を折り曲げるなどして熱融着して密封し、本発明の紙容器とする（図１１４参照）。 A paper container blank (32) in which the edge protection resin layer (4) is temporarily attached to the paper substrate end face (5) is bent in a sleeve shape along the ruled line, and one edge is overlapped with the other edge. Together, the body part bonding part is formed to form a cylindrical body member, and the upper and lower openings of the body member are bent and heat sealed to form the paper container of the present invention (FIG. 114). reference).

紙基材に胴部材ブランクを複数個並べて割りつけ、胴部材ブランクの一方の端縁にその端縁を含めた外方の部分に長窓を穿設した状態を示す、（ａ）は平面説明図であり、（ｂ）は（ａ）のＡ−Ａ’線断面説明図である。A plurality of trunk member blanks are arranged side by side on a paper base material, and a state in which a long window is formed in an outer portion including the edge at one end edge of the trunk member blank is shown. It is a figure, (b) is AA 'line sectional explanatory drawing of (a). 図１の紙基材の片面に熱可塑性樹脂層を積層した状態を示す、（ａ）は平面説明図であり、（ｂ）は（ａ）のＡ−Ａ’線断面説明図である。FIGS. 1A and 1B are diagrams illustrating a state in which a thermoplastic resin layer is laminated on one side of the paper substrate of FIG. 1, and FIG. 図２の積層シートの端縁の不必要部分を連続してカットした状態を示す、（ａ）は平面説明図であり、（ｂ）は（ａ）のＡ−Ａ’線断面説明図である。The state which cut | disconnected the unnecessary part of the edge of the lamination sheet of FIG. 2 continuously is shown, (a) is plane explanatory drawing, (b) is the AA 'line cross-sectional explanatory drawing of (a). . 本発明の紙カップの一実施例を示す、（ａ）は部分断面説明図であり、（ｂ）は（ａ）のＡ−Ａ’線断面説明図である。One Example of the paper cup of this invention is shown, (a) is fragmentary explanatory drawing, (b) is the A-A 'line sectional explanatory drawing of (a). 熱可塑性樹脂層の代わりに、熱可塑性樹脂層とバリア層を貼り合わせた複合フィルムを熱可塑性樹脂層を最内面にして紙基材の片面に積層した状態の、図２（ａ）におけるＡ−Ａ’線断面説明図である。A- in FIG. 2 (a) in a state where a composite film in which a thermoplastic resin layer and a barrier layer are bonded instead of the thermoplastic resin layer is laminated on one side of the paper substrate with the thermoplastic resin layer as the innermost surface. It is A 'line sectional explanatory drawing. 熱可塑性樹脂層の代わりに、熱可塑性樹脂層とバリア層を貼り合わせた複合フィルムを熱可塑性樹脂層を最内面にして紙基材の片面に積層した状態の、図３（ａ）におけるＡ−Ａ’線断面説明図である。3A in FIG. 3A in a state where a composite film in which a thermoplastic resin layer and a barrier layer are bonded instead of the thermoplastic resin layer is laminated on one side of the paper substrate with the thermoplastic resin layer as the innermost surface. It is A 'line sectional explanatory drawing. 熱可塑性樹脂層の代わりに、熱可塑性樹脂層とバリア層を貼り合わせた複合フィルムを熱可塑性樹脂層を最内面にして紙基材の片面に積層した積層シートを用いて紙カップとした、図４（ａ）におけるＡ−Ａ’線断面説明図である。Instead of the thermoplastic resin layer, a paper sheet cup was obtained using a laminated sheet in which a composite film in which a thermoplastic resin layer and a barrier layer were bonded together was laminated on one side of a paper substrate with the thermoplastic resin layer as the innermost surface. It is AA 'line sectional explanatory drawing in (a). 胴部材ブランクの一方の端縁にはみ出して形成される端縁保護樹脂層を紙基材に沿って折り曲げ仮接着させる、端縁保護樹脂層接着治具の説明図である。It is explanatory drawing of the edge protection resin layer adhesion | attachment jig | tool which bends and temporarily adheres the edge protection resin layer formed by protruding to one edge of a trunk | body member blank along a paper base material. 胴部材ブランクの一方の端縁にはみ出して形成される端縁保護樹脂層を紙基材に沿って折り曲げ仮接着させる、各動作を示す模式説明図である。It is a schematic explanatory drawing which shows each operation | movement which bends and temporarily adheres the edge protection resin layer formed by protruding to one edge of a trunk | body member blank along a paper base material. ロール状の紙基材にブランクを複数個並べて割り付け、ブランクの一方の端縁にその端縁を含めた外方の部分に長窓を穿設した状態を示す、（ａ）は平面説明図であり、（ｂ）は（ａ）のＡ−Ａ’線断面説明図である。A plurality of blanks are arranged side by side on a roll-shaped paper base material, and a state in which a long window is formed in an outer portion including the edge at one edge of the blank is shown in FIG. (B) is an AA ′ line cross-sectional explanatory view of (a). 図１０の紙基材の片面に熱可塑性樹脂層を積層した状態を示す、（ａ）は平面説明図であり、（ｂ）は（ａ）のＡ−Ａ’線断面説明図である。10A and 10B are diagrams illustrating a state in which a thermoplastic resin layer is laminated on one side of the paper substrate of FIG. 10, in which FIG. 10A is a plane explanatory view, and FIG. 図１０の紙基材の片面に熱可塑性樹脂層とバリア層を貼り合わせた複合フィルムを熱可塑性樹脂層が内側になるようにして積層した積層シートの一実施例を示す、断面説明図である。FIG. 11 is a cross-sectional explanatory view showing an example of a laminated sheet obtained by laminating a composite film in which a thermoplastic resin layer and a barrier layer are bonded to one side of the paper substrate of FIG. 10 so that the thermoplastic resin layer is inside. . 端縁保護樹脂層を一方の端縁に形成させたブランクの一実施例を示す、（ａ）は平面説明図であり、（ｂ）は（ａ）のＡ−Ａ’線断面説明図である。One Example of the blank which formed the edge protection resin layer in one edge is shown, (a) is plane explanatory drawing, (b) is AA 'line cross-section explanatory drawing of (a). . 本発明の紙容器の一実施例を示す、（ａ）は斜視説明図であり、（ｂ）は（ａ）のＡ−Ａ’線断面説明図である。One Example of the paper container of this invention is shown, (a) is a perspective explanatory drawing, (b) is the A-A 'sectional explanatory drawing of (a).

符号の説明Explanation of symbols

１‥‥紙基材
２‥‥熱可塑性樹脂層
２ａ‥バリア層
３‥‥積層シート
４‥‥端縁保護樹脂層
５‥‥紙基材端面
１０‥‥胴部材ブランク
１１‥‥一方の端縁、端面処理を施した方の端縁
１２‥‥もう一方の端縁、端面処理を施していない方の端縁
１３‥‥長窓
１４‥‥胴部材ブランクの不必要部分
１５‥‥胴部貼り合わせ部
１６‥‥口縁部
２０‥‥底部材
２１‥‥周縁部
２２‥‥環状脚部
３１‥‥ロール状の紙基材
３２‥‥ブランク
３３‥‥一方の端縁
３４‥‥長窓
Ｄ１‥‥第１部材
Ｄ１１‥押さえ突起
Ｄ１２‥間隙
Ｄ２‥‥第２部材
Ｄ２１‥押さえ突起
Ｄ３‥‥第３部材
Ｄ３１‥押さえ突起 DESCRIPTION OF SYMBOLS 1 ... Paper base material 2 ... Thermoplastic resin layer 2a ... Barrier layer 3 ... Laminated sheet 4 ... Edge protection resin layer 5 ... Paper base material end face 10 ... Body member blank 11 ... One edge The edge of the end face treated 12 ... The other edge, the edge of the end face not treated 13 ... Long window 14 ... Unnecessary portion of the body member blank 15 ... Body paste Alignment part 16 ... Edge part 20 ... Bottom member 21 ... Peripheral part 22 ... Annular leg part 31 ... Roll paper substrate 32 ... Blank 33 ... One edge 34 ... Long window D1 ... 1st member D11 ... Holding protrusion D12 ... Gap D2 ... 2nd member D21 ... Holding protrusion D3 ... 3rd member D31 ... Holding protrusion

Claims

少なくとも内側面に熱可塑性樹脂層が設けられた紙を基材とする積層シートから構成され、ブランク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し、該胴部材の上部と下部の開口部をそのまま又は折り畳んで熱融着させた紙容器において、前記ブランクの一方の端縁は、内面側の熱可塑性樹脂層が紙基材より所定幅はみ出して端縁保護樹脂層が形成され、前記端縁保護樹脂層は紙基材の端部近傍で外側に折り返されて、紙基材端面が被覆され、ブランクのもう一方の端縁の内面側に密着して貼り合わされて、前記紙基材と熱可塑性樹脂層の間にバリア層を設けてあり、前記ブランクの端縁保護樹脂層を紙容器の内面側より外面側に向けて櫛状の第１部材で略９０°の角度に押し曲げ、ついで押し曲げた端縁保護樹脂層を紙容器の外側方向より内側方向に向けて略９０°の角度に櫛状の第２部材で押し曲げ、最後に押し曲げた端縁保護樹脂層を紙容器の外側方向より内側方向に向けて櫛状の第３部材を押しつけて、端縁保護樹脂層をブランクの紙基材の端面に仮接着させたことを特徴とする、紙容器の端面の処理方法。 It is composed of a laminated sheet whose base material is paper with a thermoplastic resin layer provided at least on the inner surface. One end of the blank is overlapped with the other end to form a body-bonding portion. In the paper container in which the upper and lower openings of the body member are directly or folded and heat-sealed, the one end edge of the blank has the inner side thermoplastic resin layer as a paper base material. The edge protective resin layer is formed by protruding beyond a predetermined width, and the edge protective resin layer is folded outward in the vicinity of the end of the paper base to cover the end face of the paper base, and the other edge of the blank. The barrier layer is provided between the paper base material and the thermoplastic resin layer, and the edge protection resin layer of the blank is directed from the inner surface side to the outer surface side of the paper container. Press and bend it at an angle of approximately 90 ° with the first comb-shaped member, then press The bent edge protection resin layer is pushed and bent by the second comb-shaped member at an angle of approximately 90 ° from the outer side to the inner side of the paper container, and finally the bent edge protection resin layer is pushed to the outside of the paper container. A method for treating an end face of a paper container, wherein the comb-shaped third member is pressed from the direction toward the inner side to temporarily bond the edge protection resin layer to the end face of the blank paper base.

少なくとも内側面に熱可塑性樹脂層が設けられた紙を基材とする積層シートから構成され、胴部材ブランク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円筒形状の胴部材とし、ほぼ円形状の底紙の周縁部を下向きに起立させて底部材とし、前記胴部材の下部内面に底部材の周縁部の内面を接合させ、さらに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、底部材の周縁部外面に接合させて環状脚部を形成させ、胴部材の上部周縁を外方に巻き込み口縁部を形成させた紙カップにおいて、前記胴部貼り合わせ部の胴部材ブランクの一方の端縁は、少なくとも内面側の熱可塑性樹脂層が紙基材より所定幅はみ出して端縁保護樹脂層が形成され、前記端縁保護樹脂層は紙基材の端部近傍で折り返されて、紙基材端面が被覆され、胴部材ブランクのもう一方の端縁の内面側に密着されて胴部貼り合わせ部が形成され、前記紙基材と熱可塑性樹脂層の間にバリア層を設けてあり、前記胴部材ブランクの端縁保護樹脂層を紙カップの内面側より外面側に向けて櫛状の第１部材で略９０°の角度に押し曲げ、ついで押し曲げた端縁保護樹脂層を胴部材ブランクの外側方向より内側方向に向けて略９０°の角度に櫛状の第２部材で押し曲げ、最後に押し曲げた端縁保護樹脂層を胴部材ブランクの外側方向より内側方向に向けて櫛状の第３部材を押しつけて、端縁保護樹脂層を胴部材ブランクの紙基材の端面に仮接着させたことを特徴とする、紙カップ胴部材の端面の処理方法。 It is composed of a laminated sheet based on paper with a thermoplastic resin layer provided at least on the inner surface, and one end of the body member blank is overlapped with the other end to form a body bonded part. A cylindrical body member, and a peripheral member of the substantially circular bottom paper is erected downward to form a bottom member. The inner surface of the peripheral member of the bottom member is joined to the lower inner surface of the body member, and the peripheral portion is covered. In the paper cup in which the lower end edge of the body member is bent inward, joined to the outer peripheral surface of the bottom member to form an annular leg, and the upper periphery of the body member is wound outward to form a mouth edge The one end edge of the body member blank of the body portion bonding portion has at least an inner surface side thermoplastic resin layer protruding from the paper base by a predetermined width to form an edge protection resin layer, and the edge protection resin layer Is folded near the edge of the paper substrate Material end face is coated, is in close contact with the inner surface of the other end edge with portions bonded body of the cylinder member blank form, is provided with a barrier layer between the paper substrate and the thermoplastic resin layer, The edge protecting resin layer of the body member blank is bent and bent at an angle of about 90 ° with a comb-shaped first member from the inner surface side to the outer surface side of the paper cup. The edge protection resin layer is pushed and bent by a second comb-like member at an angle of about 90 ° from the outer side to the inner side, and finally, the edge protection resin layer is comb-like from the outer side to the inner side. A method for treating an end face of a paper cup barrel member, wherein the third member is pressed to temporarily bond the edge protection resin layer to the end face of the paper base of the barrel member blank.