JP7735532B2 - Container and container manufacturing method - Google Patents
Container and container manufacturing methodInfo
- Publication number
- JP7735532B2 JP7735532B2 JP2024505888A JP2024505888A JP7735532B2 JP 7735532 B2 JP7735532 B2 JP 7735532B2 JP 2024505888 A JP2024505888 A JP 2024505888A JP 2024505888 A JP2024505888 A JP 2024505888A JP 7735532 B2 JP7735532 B2 JP 7735532B2
- Authority
- JP
- Japan
- Prior art keywords
- flange
- paper
- flange portion
- container
- force
- 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.)
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Classifications
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/14—Cutting, e.g. perforating, punching, slitting or trimming
- B31B50/16—Cutting webs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/26—Folding sheets, blanks or webs
- B31B50/28—Folding sheets, blanks or webs around mandrels, e.g. for forming bottoms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/59—Shaping sheet material under pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/60—Uniting opposed surfaces or edges; Taping
- B31B50/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding
-
- 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
- B65D3/30—Local reinforcements, e.g. metallic rims
-
- 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
- B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
- B65D77/10—Container closures formed after filling
- B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
- B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
- B65D77/2028—Means for opening the cover other than, or in addition to, a pull tab
- B65D77/2032—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2105/00—Rigid or semi-rigid containers made by assembling separate sheets, blanks or webs
- B31B2105/002—Making boxes characterised by the shape of the blanks from which they are formed
- B31B2105/0022—Making boxes from tubular webs or blanks, e.g. with separate bottoms, including tube or bottom forming operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2110/00—Shape of rigid or semi-rigid containers
- B31B2110/10—Shape of rigid or semi-rigid containers having a cross section of varying size or shape, e.g. conical or pyramidal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2110/00—Shape of rigid or semi-rigid containers
- B31B2110/20—Shape of rigid or semi-rigid containers having a curved cross section, e.g. circular
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2120/00—Construction of rigid or semi-rigid containers
- B31B2120/002—Construction of rigid or semi-rigid containers having contracted or rolled necks, having shoulders
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Packages (AREA)
Description
本発明は、飲食料品のための容器及びその製造方法に関する。 The present invention relates to a container for food and beverages and a method for manufacturing the same.
従来から、飲食料品のための容器（紙コップ）として、それぞれシート状材料からなりサイドシーム部（貼り合わせ部）を有する胴部と当該胴部の内側に取り付けられた底部とを有する容器の開口端がフィルム状の蓋材によって密封されたものが広く使用されている。 Conventionally, widely used containers (paper cups) for food and beverages consist of a body made of sheet-like material with a side seam (bonded portion) and a bottom attached to the inside of the body, with the open end sealed with a film-like lid.
上記容器の開口端には、容器の外側に向かうフランジ部が設けられており、容器内に飲料等の内容物が充填された後、当該フランジ部に、蓋材が例えばヒートシールによって接着される。 The open end of the container has a flange portion that faces the outside of the container, and after the container is filled with contents such as a beverage, a lid material is attached to the flange portion, for example by heat sealing.
下記特許文献１には、上記フランジ部（マウスロール）をその断面が円形（カール形状）となるように形成することが記載されている。 Patent document 1 below describes forming the flange portion (mouth roll) so that its cross section is circular (curled).
下記特許文献２には、上記フランジ部（カップリム部）が、上下方向から押圧されて偏平に形成されることが記載されている。 Patent document 2 below describes how the flange portion (cup rim portion) is pressed from above and below to form a flattened shape.
しかしながら、フランジ部が上記特許文献１に記載のようなカール形状である場合、蓋材のシール時にフランジ部が変形してしまい、口外径寸法が変化することで、当該フランジ部に嵌合させる蓋（オーバーキャップ）の嵌合性が悪くなってしまう場合がある。However, if the flange portion has a curled shape as described in Patent Document 1 above, the flange portion may deform when the lid material is sealed, changing the outer diameter of the opening, which may result in poor fit of the lid (overcap) that fits onto the flange portion.
また、フランジ部が上記特許文献１に記載のようなカール形状である場合、及び、上記特許文献２に記載のような押圧偏平形状である場合には、蓋材の開封時にフランジ部が変形してしまうことで、安定して開封することができず、また上記と同じく上記蓋の嵌合性が悪くなってしまう場合がある。 Furthermore, if the flange portion has a curled shape as described in Patent Document 1 above, or a pressed flat shape as described in Patent Document 2 above, the flange portion may deform when the lid material is opened, making it impossible to open stably, and as mentioned above, the fitting of the lid may become poor.
以上のような事情に鑑み、本発明の目的は、蓋材のシール条件を変更することなく、蓋材のシール時及び開封時におけるフランジ部の変形を抑制可能な容器及び当該容器の製造方法を提供することにある。 In light of the above circumstances, the object of the present invention is to provide a container and a method for manufacturing such a container that can suppress deformation of the flange portion when sealing and opening the lid material without changing the sealing conditions of the lid material.
上記目的を達成するため、本発明の一形態に係る容器は、筒状の胴部とフランジ部と底部とを有する。上記胴部は、熱可塑性樹脂で被覆された紙材が接着されて形成されたサイドシーム部を側面に有する。上記フランジ部は、上記胴部の一端に巻き込まれた上記紙材によって形成され、蓋材がヒートシールにより接着される。上記底部は上記胴部の他端に形成される。上記フランジ部は、その上面の外周端に、所定高さ及び所定幅の段差部を有する。 To achieve the above object, a container according to one embodiment of the present invention has a cylindrical body, a flange, and a bottom. The body has a side seam formed by bonding a paper material coated with a thermoplastic resin on its side. The flange is formed by the paper material wrapped around one end of the body, and a lid material is bonded by heat sealing. The bottom is formed at the other end of the body. The flange has a step of a predetermined height and width at the outer peripheral edge of its upper surface.
この構成により、フランジ部の上面外周端に段差部を設けることで、蓋材のシール時に、シールヘッドが段差部には接触せずフランジ部の内側にのみ接触することで、フランジ部の変形を防ぐことができ、また蓋材の開封時に、開封する力の支点（胴部とフランジ部の境界）に対する作用点がフランジ部の外周端よりも内側（段差部の開始点）になるため、力のモーメントが小さくなり、フランジ部の変形を抑制することができる。 With this configuration, a step is provided on the outer peripheral edge of the upper surface of the flange, and when the lid is sealed, the seal head does not come into contact with the step but only with the inside of the flange, preventing deformation of the flange. Furthermore, when the lid is opened, the point of action of the fulcrum of the opening force (the boundary between the body and flange) is located inside the outer peripheral edge of the flange (the starting point of the step), reducing the moment of force and suppressing deformation of the flange.
上記所定高さは、上記紙材の厚みの二分の一以上であってもよい。 The specified height may be at least half the thickness of the paper material.
これにより、段差部の高さを最低限確保し、蓋材のシール時に段差部がシールされてしまうのを防ぐことができる。 This ensures that the height of the step is at a minimum level and prevents the step from being sealed when the lid material is sealed.
上記所定幅は、上記胴部と上記フランジ部との境界を上記蓋材の開封時の力の支点、上記段差部の開始点を上記力の作用点とした場合に、上記力のモーメントが６０Ｎ・ｍｍ未満となるような長さに設定されてもよい。 The specified width may be set to a length such that, when the boundary between the body portion and the flange portion is the fulcrum of the force when the lid material is opened and the starting point of the step portion is the point of application of the force, the moment of the force is less than 60 N·mm.
これにより開封時の力のモーメントを６０Ｎ・ｍｍ未満とすることで、シール強度を維持しながらも開封時のフランジ部の変形を抑制することができる。力のモーメントが６０Ｎ・ｎｍ以上であると、開封時にフランジ部が変形してしまうおそれがある。なおこのような段差部の幅は、概ね、紙材の厚みの２倍以上となる。By keeping the force moment when opening to less than 60 N·mm, deformation of the flange when opening can be suppressed while maintaining seal strength. If the force moment is 60 N·mm or more, there is a risk of deformation of the flange when opening. The width of such a step is generally more than twice the thickness of the paper material.
上記フランジ部は、上記段差部の下方に位置し上記胴部の半径方向における断面視で上記紙材が２枚重なった２層部と、上記２層部よりも内周側に位置し上記断面視で上記紙材が３枚重なった３層部と、を有してもよい。この場合上記２層部は上記２枚の紙を接着する１つの接着部を有し、上記３層部は上記３枚の紙を接着する２つの接着部を有してもよい。 The flange portion may have a two-layer portion located below the step portion and having two overlapping sheets of paper in a cross-sectional view in the radial direction of the body portion, and a three-layer portion located more inward than the two-layer portion and having three overlapping sheets of paper in a cross-sectional view. In this case, the two-layer portion may have one adhesive portion bonding the two sheets of paper together, and the three-layer portion may have two adhesive portions bonding the three sheets of paper together.
これにより、２層部においては段差部の強度を上げることができ、３層部においては蓋材のシール時に安定して高い強度でシールを行うことができる。 This increases the strength of the stepped portion in the two-layer portion, and in the three-layer portion, a stable, high-strength seal can be achieved when sealing the lid material.
上記フランジ部は、上記２層部の上記接着部と上記３層部の上記接着部との間に空間を有してもよい。 The flange portion may have a space between the adhesive portion of the second layer portion and the adhesive portion of the third layer portion.
これにより、蓋材のシール強度が高い３層部とシール強度が低い２層部との間に空間が形成されることで、シール強度が３層部３５よりも低く２層部３４よりも高い部分が形成され、フランジ部の外周側から内周側へかけてシール強度を段階的に高くすることができるため、蓋材の開封時にも外周側から内周側へ徐々に力のモーメントを大きくして開封性を向上させることができる。 This creates a space between the three-layer portion of the lid material, which has a high sealing strength, and the two-layer portion, which has a low sealing strength, creating a portion with a sealing strength lower than the three-layer portion 35 and higher than the two-layer portion 34.This allows the sealing strength to increase gradually from the outer periphery to the inner periphery of the flange portion, so that when the lid material is opened, the force moment gradually increases from the outer periphery to the inner periphery, improving openability.
本発明の他の形態に係る容器製造方法は、
熱可塑性樹脂で被覆された紙材を接着して側面にサイドシーム部を有する筒状の胴部を形成し、
上記胴部の一端に底部を形成し、
上記胴部の他端を巻き込み加工してカール状のフランジ部を形成し、
上記フランジ部の外周端をプレス成型することで、所定高さ及び所定幅の段差部を形成する、ことを含む。
A container manufacturing method according to another aspect of the present invention includes:
a paper material coated with a thermoplastic resin is bonded to form a cylindrical body having a side seam on the side;
A bottom is formed at one end of the body portion,
The other end of the body is rolled to form a curled flange portion.
The method includes press-molding the outer peripheral edge of the flange portion to form a step portion having a predetermined height and a predetermined width.
これにより、従来のカール部の製造工程に、外周端のプレス成型工程を追加するだけで、蓋材のシール時及び開封時におけるフランジ部の変形を抑制可能な容器を製造することができる。 This means that by simply adding a press molding process for the outer edge to the conventional curled portion manufacturing process, it is possible to manufacture containers that can suppress deformation of the flange portion when the lid material is sealed and opened.
以上説明したように、本発明によれば、蓋材のシール条件を変更することなく、蓋材のシール時及び開封時におけるフランジ部の変形を抑制可能な容器及び当該容器の製造方法を提供することができる。しかし、この効果は本発明を限定するものではない。As described above, the present invention provides a container and a method for manufacturing such a container that can suppress deformation of the flange portion when the lid is sealed and opened without changing the sealing conditions of the lid. However, this effect does not limit the present invention.
以下、図面を参照しながら、本発明の実施形態を説明する。 An embodiment of the present invention will be described below with reference to the drawings.
［紙コップの外観］
図１は、本発明の一実施形態に係る容器としての紙コップの正面外観を示す図である。同図の一部は断面で示されている。
[Appearance of paper cup]
Fig. 1 is a diagram showing the front appearance of a paper cup as a container according to one embodiment of the present invention, with a portion of the figure shown in cross section.
同図に示すように、本実施形態に係る紙コップ１００は、胴部１と底部２とを有する。 As shown in the same figure, the paper cup 100 of this embodiment has a body 1 and a bottom 2.
胴部１は、原料となる紙材（原紙）が例えばポリエチレン、ポリプロピレン、ポリエステル等の熱可塑性樹脂で被覆（ラミネート加工）されて扇形のブランクとして打ち抜かれ、円筒状の金型に巻きつけられて側端部同士が重ねられて接着されたものである。この側端部同士の接着により、胴部２の側面には、その上下にかけてサイドシーム部４が形成されている。The body 1 is made by punching out a fan-shaped blank from raw paper (base paper) that has been coated (laminated) with a thermoplastic resin such as polyethylene, polypropylene, or polyester, and then wrapping it around a cylindrical mold and gluing the side edges together. This gluing of the side edges forms a side seam 4 on the top and bottom of the side of the body 2.
底部２は、胴部１と同様の紙材から打ち抜かれた円形の底紙が絞り加工され、上記胴部１の接着と同時に、胴部１の下端の内側に接着されたものである。 The bottom 2 is made by drawing a circular bottom paper punched out from the same paper material as the body 1, and then gluing it to the inside of the lower end of the body 1 at the same time as gluing the body 1.
底部２が接着された胴部１の下端は、紙材が内側に折り込まれ圧着されている。また胴部１の上端には、紙材が外側に巻き込まれたフランジ部３が形成され、胴部１は当該フランジ部３において開口した状態となっている。 The bottom end of the body 1, to which the bottom 2 is attached, has paper folded inward and crimped. The top end of the body 1 has a flange 3, with paper folded outward, and the body 1 is open at this flange 3.
当該フランジ部３に、紙コップ１００に飲料や氷等の内容物が充填された後、例えばポリエチレンフィルム等の蓋材がヒートシールにより接着されることで、紙コップ１００が密封される。 After the paper cup 100 is filled with contents such as beverages or ice, the flange portion 3 is sealed by attaching a lid material such as polyethylene film by heat sealing.
上記胴部１及び底部２の原料としての紙材は、例えば複数層から構成されている。当該紙材には、上記熱可塑性樹脂によるラミネート層以外に、合成樹脂層や発泡層、金属層、無機蒸着フィルム等が積層されても構わない。The paper material used as the raw material for the body 1 and bottom 2 may be composed of multiple layers. In addition to the thermoplastic resin laminate layer, the paper may also be laminated with a synthetic resin layer, a foam layer, a metal layer, an inorganic vapor deposition film, etc.
内容物が氷等の硬い物体である場合に紙コップ１００を破れにくくするために、胴部１及び底部２はさらにポリエチレンテレフタレート等の樹脂フィルムを積層してもよい。 To make the paper cup 100 less likely to break when the contents are hard objects such as ice, the body 1 and bottom 2 may be further laminated with a resin film such as polyethylene terephthalate.
［フランジ部の形状］
図２は、上記フランジ部３（図１のＥ部分）の拡大断面図である。
[Flange shape]
FIG. 2 is an enlarged cross-sectional view of the flange portion 3 (part E in FIG. 1).
同図に示すように、フランジ部３は、上記蓋材が接着されるシール面３１と、上記胴部１が巻き込まれた巻き込み部３２と、段差部３３とを有する。 As shown in the same figure, the flange portion 3 has a sealing surface 31 to which the lid material is adhered, a roll-up portion 32 into which the body portion 1 is rolled up, and a step portion 33.
フランジ部３の幅Ａは２～５ｍｍであり、フランジ部３の厚みＢは、紙材の厚みＴの３倍にほぼ等しい。 The width A of the flange portion 3 is 2 to 5 mm, and the thickness B of the flange portion 3 is approximately equal to three times the thickness T of the paper material.
段差部３３は、フランジ部３の上面の外周端に形成される。後述するが、当該段差部３３は、丸カール状のフランジ部の外周端をプレス成型することで形成される。 The step portion 33 is formed at the outer peripheral edge of the upper surface of the flange portion 3. As will be described later, the step portion 33 is formed by press-molding the outer peripheral edge of the rounded flange portion.
当該段差部３３を設けることで、蓋材のシール時に、シールヘッドが段差部３３には接触せずフランジ部３の内側（シール面３１）にのみ接触することで、フランジ部３の変形を防ぐことができる。また蓋材の開封時に、開封する力（同図矢印）の支点Ｆ（胴部１とフランジ部３の境界）に対する作用点Ｗがフランジ部３の外周端よりも内側（段差部３３の開始点）になるため、力のモーメントが小さくなり、フランジ部３の変形を抑制することができる。 By providing this step 33, when the lid is sealed, the seal head does not come into contact with the step 33 but only with the inside of the flange 3 (seal surface 31), preventing deformation of the flange 3. Furthermore, when the lid is opened, the point of application W of the opening force (indicated by the arrow in the figure) relative to the fulcrum F (the boundary between the body 1 and the flange 3) is located inside the outer periphery of the flange 3 (the starting point of the step 33), reducing the moment of force and preventing deformation of the flange 3.
またフランジ部３は、段差部３３の下方に位置し胴部１の半径方向（Ｘ方向）における断面視で紙材が２枚重なった２層部３４と、当該２層部３４よりも内周側に位置し上記断面視で紙材が３枚重なった３層部３５とを有する。すなわち段差部３３は、丸カール状のフランジ部のうち、内周側の紙材が３枚重なった部分はそのまま残し、外周端の紙材が２枚重なった部分をプレス加工することで形成される。 Flange portion 3 also has a two-layer portion 34 located below step portion 33 and consisting of two overlapping layers of paper material in a cross-sectional view in the radial direction (X direction) of body portion 1, and a three-layer portion 35 located more inward than two-layer portion 34 and consisting of three overlapping layers of paper material in the cross-sectional view. In other words, step portion 33 is formed by leaving the innermost three-layer overlapping layer of paper material as is in the rounded curled flange portion, and press-forming the outermost two-layer overlapping layer of paper material.
２層部３４は、上記２枚の紙を融着等により接着する１つの接着部３４ａを有し、３層部３５は，上記３枚の紙を融着等により接着する２つの接着部３５ａ及び３５ｂを有する。これにより、２層部３４においては段差部３３の強度を上げることができ、３層部３５においては蓋材のシール時に安定して高い強度でシールを行うことができる。 The two-layer section 34 has one adhesive section 34a that bonds the two sheets of paper together by fusion or other means, while the three-layer section 35 has two adhesive sections 35a and 35b that bond the three sheets of paper together by fusion or other means. This increases the strength of the stepped section 33 in the two-layer section 34, while the three-layer section 35 allows for a stable, high-strength seal when sealing the lid.
また上記２層部３４の接着部３４ａと上記３層部３５の接着部３５ａ及び３５ｂとの間には、空間Ｓが形成されている。これにより、蓋材のシール強度が高い３層部３５と、シール強度が低い２層部３４との間に空間Ｓが形成されることで、シール強度が３層部３５よりも低く２層部３４よりも高い部分が形成されることになる。したがって、フランジ部３３の外周側から内周側へかけてシール強度を段階的に高くすることができるため、蓋材の開封時にも外周側から内周側へ徐々に力のモーメントを大きくして開封性を向上させることができる。 A space S is also formed between the adhesive portion 34a of the two-layer portion 34 and the adhesive portions 35a and 35b of the three-layer portion 35. This creates a space S between the three-layer portion 35, which has a high sealing strength of the lid material, and the two-layer portion 34, which has a low sealing strength, resulting in a portion with a lower sealing strength than the three-layer portion 35 and a higher sealing strength than the two-layer portion 34. Therefore, the seal strength can be increased in stages from the outer periphery to the inner periphery of the flange portion 33, and therefore, when opening the lid material, the force moment can be gradually increased from the outer periphery to the inner periphery, improving openability.
ここで段差部３３の高さＤ（シール面３１と段差部３３の底面との距離）は、上記紙材の厚みＴの二分の一以上とされる。 Here, the height D of the step portion 33 (the distance between the sealing surface 31 and the bottom surface of the step portion 33) is at least half the thickness T of the paper material.
図３は、当該段差部３３の高さＤを決めるための検討結果を示した表である。同図に示すように、本発明者等は、密度の異なる４種類の原紙（原紙Ａ～Ｄ）について、上記プレス成型時の圧縮後の原紙の厚みを計算した。 Figure 3 is a table showing the results of a study to determine the height D of the step portion 33. As shown in the figure, the inventors calculated the thickness of the base paper after compression during the press molding for four types of base paper (base papers A to D) with different densities.
紙コップ１００の原紙は、使用実績から密度0.75g/cm3以上であり、原紙の主成分であるセルロースの固有密度は1.5g/cm3であるから、圧縮比率は２以下となる。 The base paper of paper cup 100 has a density of 0.75 g/cm3 or more based on usage history, and the inherent density of cellulose, the main component of the base paper, is 1.5 g/cm3, so the compression ratio is 2 or less.
上述のように、段差部３３はカール状のフランジ部のうち内周側の原紙が３枚重なった部分（３層部３５に対応）はそのまま残し、外周端の原紙が２枚重なった部分（２層部３４に対応）をプレス加工することで形成されるところ、同図に示すように、３枚の紙の圧縮後の厚みと、２枚の紙の圧縮後の厚みとの差（段差部３３の高さに相当）は、0.15mm（原紙の厚みＴの二分の一）となる。したがって、段差部３３の高さＤは、Ｔ／２以上とすることが望ましい。As described above, step portion 33 is formed by leaving the innermost portion of the curled flange where three layers of base paper overlap (corresponding to three-layer portion 35) as is, and pressing the outermost portion where two layers of base paper overlap (corresponding to two-layer portion 34). As shown in the figure, the difference between the thickness of three layers of paper after compression and the thickness of two layers of paper after compression (corresponding to the height of step portion 33) is 0.15 mm (half the thickness T of the base paper). Therefore, it is desirable that the height D of step portion 33 be T/2 or greater.
また段差部３３の幅Ｃ（シール面３１と段差部３３との境界からフランジ部３の外周端までの距離）は、胴部１とフランジ部３との境界を上記蓋材の開封時の力の支点Ｆ、段差部３３の開始点を上記力の作用点Ｗとした場合に、当該作用点Ｗがフランジ部３の幅Ａ方向（Ｘ方向）のほぼ中央付近に位置するような長さに設定されている。 Furthermore, the width C of the step portion 33 (the distance from the boundary between the sealing surface 31 and the step portion 33 to the outer peripheral edge of the flange portion 3) is set to a length such that, when the boundary between the body portion 1 and the flange portion 3 is defined as the fulcrum F of the force when the lid material is opened and the starting point of the step portion 33 is defined as the point of application W of the force, the point of application W is located approximately in the center of the width A direction (X direction) of the flange portion 3.
図４は、段差部の幅Ｃを決めるための実験結果を示した表である。同図に示すように、本発明者等は、支点Ｆから作用点Ｗの距離（フランジ部３の幅－段差部３３の幅）を変更して、シールされた蓋材を開封する際のピール強度、力のモーメントを測定した。 Figure 4 is a table showing the experimental results for determining the width C of the step portion. As shown in the figure, the inventors changed the distance from the fulcrum F to the point of application W (width of the flange portion 3 - width of the step portion 33) and measured the peel strength and moment of force when opening the sealed lid material.
実験に使用した原紙の厚み約0.30ｍｍであり、フランジ部３の幅は3.0mmとした。また蓋材のシール時の条件は、シール時間1.2sec、シール温度130℃、シール圧力130kgfとした。The thickness of the base paper used in the experiment was approximately 0.30 mm, and the width of the flange portion 3 was 3.0 mm. The conditions for sealing the lid material were a sealing time of 1.2 seconds, a sealing temperature of 130°C, and a sealing pressure of 130 kgf.
同図に示すように、支点Ｆから作用点Ｗまでの距離を３．０ｍｍ未満とし、かつ開封時の力のモーメント６０Ｎ・ｍｍ未満とすることで、１５Ｎ～２０Ｎのピール強度を維持し、開封機能を保持する事が可能であったが、ピール強度が２０Ｎ以上(力のモーメントが６０Ｎ・ｍｍ以上）となる幅の場合にはフランジ部３が変形し（持ち上がってしまい）、開封できない場合があった。 As shown in the figure, by making the distance from fulcrum F to point of application W less than 3.0 mm and making the force moment when opening less than 60 N·mm, it was possible to maintain a peel strength of 15 N to 20 N and retain the opening function; however, when the width was such that the peel strength was 20 N or more (force moment was 60 N·mm or more), the flange portion 3 deformed (lifted up), and in some cases it became impossible to open.
したがって段差部３３の幅Ｃは、蓋材の開封時に作用点Ｗにかかる力のモーメントが６０Ｎ・ｍｍ未満となるような長さに設定されるのが好ましい。当該幅Ｃは、概ね、紙材の厚みＴの２倍よりも大きくなる。Therefore, it is preferable that the width C of the step portion 33 be set to a length such that the moment of force applied to the point of application W when the lid is opened is less than 60 N·mm. The width C is generally greater than twice the thickness T of the paper material.
図５は、以上のように構成されたフランジ部３のシール時の変形および口外径寸法変化についての実験結果を、従来の丸カール状のフランジ部と比較して示した表である。 Figure 5 is a table showing the experimental results of the deformation and change in the outer diameter dimension of the opening when sealing the flange portion 3 configured as described above, compared with a conventional round curled flange portion.
同図に示すように、従来の丸カール状のフランジ部と、本実施形態のフランジ部３について、蓋材のシール前後におけるＸ方向（サイドシーム部４を含まない外径）とＺ方向（サイドシーム部４を含む外径）（図１）の口外径寸法を計測し、その平均値、最大値、最小値、範囲（最大値と最小値の差）、標準偏差を算出した。 As shown in the figure, the outer diameter dimensions of the opening in the X direction (outer diameter excluding the side seam portion 4) and Z direction (outer diameter including the side seam portion 4) (Figure 1) were measured for a conventional round curled flange portion and the flange portion 3 of this embodiment before and after sealing the lid material, and the average value, maximum value, minimum value, range (difference between the maximum and minimum values), and standard deviation were calculated.
従来の丸カール状のフランジ部では、平均値でＸ方向において＋０．７ｍｍ、Ｚ方向においても＋０．９ｍｍと、寸法変化が大きかったのに対して、本実施形態のフランジ部３においては、平均値でＸ方向において－０．１ｍｍ、Ｚ方向においても－０．１ｍｍと、寸法変化は極めて小さかった。 In the conventional round curled flange portion, the dimensional change was large, with an average change of +0.7 mm in the X direction and +0.9 mm in the Z direction, whereas in the flange portion 3 of this embodiment, the dimensional change was extremely small, with an average change of -0.1 mm in the X direction and -0.1 mm in the Z direction.
したがって、本実施形態の段差部３３が、シール時の変形及び口外形寸法変化を防止できること実証された。 Therefore, it has been demonstrated that the step portion 33 of this embodiment can prevent deformation and changes in the outer dimensions of the mouth during sealing.
［紙コップの製造方法］
次に、上記紙コップ１００の製造方法について説明する。図６は、紙コップ１００の製造工程の流れを示したフローチャートである。
[Paper cup manufacturing method]
Next, a description will be given of a method for manufacturing the paper cup 100. Fig. 6 is a flowchart showing the flow of the manufacturing process for the paper cup 100.
同図に示すように、まず、上記熱可塑性樹脂でラミネートされた紙材から扇形のブランクが打ち抜かれ、その両端部がガスバーナー等で溶融された状態で筒状の金型に巻きつけられて接着されることで胴部１が形成される（ステップ６１）。 As shown in the figure, first, a fan-shaped blank is punched out from paper material laminated with the above-mentioned thermoplastic resin, and both ends of the blank are melted using a gas burner or the like and then wrapped around a cylindrical mold and glued together to form the body 1 (step 61).
また、上記と同様の紙材から打ち抜かれた円形の底紙が絞り加工されて、上記円筒状の金型に真空吸着された状態で、上記胴部１の端部同士の接着と同時に胴部１の下端内側に接着される。そして、胴部１の下端が底部２側に折り込まれて圧着されることで、底部２が胴部１に接合される（ステップ６２）。 A circular bottom paper cut out from the same paper material as above is drawn and vacuum-adsorbed onto the cylindrical mold. It is then bonded to the inside of the lower end of the body 1 while simultaneously bonding the ends of the body 1 together. The lower end of the body 1 is then folded toward the bottom 2 and crimped, thereby joining the bottom 2 to the body 1 (step 62).
続いて、カーリング処理によって、胴部１の上端がツールで回転されながら外側へ巻き込まれることで、胴部１の半径方向（Ｘ方向）における断面が円形となるフランジ部が形成される（ステップ６３）。 Next, a curling process is performed in which the upper end of the body 1 is rotated by a tool and curled outward, forming a flange portion with a circular cross section in the radial direction (X direction) of the body 1 (step 63).
続いて、上記断面円形のフランジ部が、上記図２で示したようにその外周端がプレス加工されることで、段差部３３が形成される（ステップ６４）。これにより上部が開口した紙コップ１００が製造される。Next, the outer edge of the circular flange is pressed as shown in Figure 2 above to form the stepped portion 33 (step 64). This produces a paper cup 100 with an open top.
そして、上記紙コップ１００に氷や飲料等の内容物が充填され、ヒートシールによって蓋材が開口部（フランジ部３のシール面３１）に接着されることで、紙コップ１００が密封される（ステップ６５）。 Then, the paper cup 100 is filled with ice, beverages, or other contents, and the lid material is heat-sealed to adhere to the opening (sealing surface 31 of the flange portion 3), thereby sealing the paper cup 100 (step 65).
このヒートシール時において、シールヘッドは先にシール面３１を押圧し、それに遅れて段差部３３を押圧することになるため、そのタイムラグの分だけ、シール面３１におけるシール強度は高く、段差部３３におけるシール強度は低くなる。 During this heat sealing, the seal head first presses the seal surface 31, and then presses the step portion 33 afterwards. Therefore, due to this time lag, the seal strength at the seal surface 31 is high and the seal strength at the step portion 33 is low.
［まとめ］
以上説明したように、本実施形態によれば、フランジ部３の上面外周端に段差部３３を設けることで、蓋材のシール時及び開封時におけるフランジ部３の変形を抑制することができる。これにより、蓋材のシール条件を変更することなく、シール時にフランジ部３の口外径寸法が変化するのを防ぎ、フランジ部３に嵌合させる蓋（オーバーキャップ）の嵌合性が悪くなってしまうのを防ぐことができるとともに、開封時に安定して開封することができる。
[summary]
As described above, according to this embodiment, by providing the step portion 33 at the outer peripheral edge of the upper surface of the flange portion 3, it is possible to suppress deformation of the flange portion 3 when sealing and unsealing the lid material. This prevents the outer diameter dimension of the opening of the flange portion 3 from changing when sealing, without changing the sealing conditions of the lid material, prevents deterioration of the fit of the lid (overcap) that fits onto the flange portion 3, and allows for stable unsealing.
［変形例］
本技術は上述の実施形態にのみ限定されるものではなく、本技術の要旨を逸脱しない範囲内において種々変更され得る。
[Modification]
The present technology is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit and scope of the present technology.
上記フランジ部３及び段差部３３の形状は、上記図２に示したものに限られない。例えば、図２に示した段差部３３は、シール面３１とほぼ平行な底面と、シール面３１と底面とを繋ぐ斜面とで構成されているが、当該斜面がより垂直に近い面とされ、底面がより広く形成されてもよい。 The shapes of the flange portion 3 and the stepped portion 33 are not limited to those shown in Figure 2. For example, the stepped portion 33 shown in Figure 2 is composed of a bottom surface that is approximately parallel to the sealing surface 31 and a slope connecting the sealing surface 31 and the bottom surface, but the slope may be made closer to a vertical surface and the bottom surface may be formed wider.
上述の実施形態においては、胴部１と底部２とは異なるパーツとして製造されて胴部１に底部２が接着されることで紙コップ１００が製造されていた。しかし、１枚の紙材から胴部と底部とが一体に形成されて紙コップ等の容器が製造されてもよく、この場合でもフランジ部は上述の実施形態と同様に成形され得る。In the above-described embodiment, the body 1 and bottom 2 are manufactured as separate parts, and the paper cup 100 is manufactured by adhering the bottom 2 to the body 1. However, a container such as a paper cup may also be manufactured by integrally forming the body and bottom from a single sheet of paper, and in this case the flange portion can be molded in the same manner as in the above-described embodiment.
上述の実施形態では、容器として紙コップ１００が示されたが、容器の用途はコップに限られず、例えば菓子等の食品を収容するものであってもよい。 In the above embodiment, a paper cup 100 is shown as the container, but the use of the container is not limited to a cup and may also be for storing food such as sweets.
Claims (5)
前記胴部の一端に巻き込まれた前記紙材によって形成され、蓋材がヒートシールにより接着される上面を有するフランジ部と、
前記胴部の他端に形成された底部とを具備し、
前記フランジ部は、前記上面の外周端に、所定高さ及び所定幅の段差部を有し、
前記所定幅は、前記胴部と前記フランジ部との境界を前記蓋材の開封時の力の支点、前記段差部の開始点を前記力の作用点とした場合に、前記力のモーメントが６０Ｎ・ｍｍ未満となるような長さに設定される
容器。 a cylindrical body portion having a side seam portion formed by bonding a paper material coated with a thermoplastic resin;
a flange portion formed by the paper material rolled up at one end of the body portion and having an upper surface to which a lid material is adhered by heat sealing;
a bottom portion formed at the other end of the body portion,
the flange portion has a step portion of a predetermined height and a predetermined width at the outer peripheral edge of the upper surface,
The specified width is set to a length such that, when the boundary between the body and the flange is the fulcrum of the force when the lid is opened and the starting point of the step is the point of application of the force, the moment of the force is less than 60 N·mm.
前記所定高さは、前記紙材の厚みの二分の一以上である
容器。 10. The container of claim 1,
The predetermined height is equal to or greater than half the thickness of the paper material.
前記フランジ部は、
前記段差部の下方に位置し前記胴部の半径方向における断面視で前記紙材が２枚重なった２層部と、
前記２層部よりも内周側に位置し前記断面視で前記紙材が３枚重なった３層部と、を有し、
前記２層部は前記２枚の紙を接着する１つの接着部を有し、
前記３層部は前記３枚の紙を接着する２つの接着部を有する
容器。 10. The container of claim 1,
The flange portion is
a two-layer portion located below the step portion and in which two sheets of the paper material are stacked in a cross-sectional view in the radial direction of the body portion;
a three-layer portion located more inward than the second-layer portion and in which three sheets of the paper material are stacked in the cross-sectional view;
The two-layer portion has one adhesive portion that bonds the two sheets of paper together,
The three-layer portion has two adhesive portions that bond the three sheets of paper together.
前記フランジ部は、前記２層部の前記接着部と前記３層部の前記接着部との間に空間を有する
容器。 4. The container of claim 3,
The flange portion has a space between the adhesive portion of the second layer portion and the adhesive portion of the third layer portion.
前記胴部の一端に底部を形成し、
前記胴部の他端を巻き込み加工して、蓋材がヒートシールにより接着される上面を有する、カール状のフランジ部を形成し、
前記フランジ部の前記上面の外周端をプレス成型することで、所定高さ及び所定幅の段差部を形成し、
前記所定幅を、前記胴部と前記フランジ部との境界を前記蓋材の開封時の力の支点、前記段差部の開始点を前記力の作用点とした場合に、前記力のモーメントが６０Ｎ・ｍｍ未満となるような長さに設定する
容器の製造方法。 a paper material coated with a thermoplastic resin is bonded to form a cylindrical body having a side seam on the side;
A bottom is formed at one end of the body portion,
The other end of the body is rolled to form a curled flange having an upper surface to which a lid material is bonded by heat sealing ;
a step portion having a predetermined height and a predetermined width is formed by press-molding the outer peripheral edge of the upper surface of the flange portion;
A method for manufacturing a container, wherein the specified width is set to a length such that, when the boundary between the body portion and the flange portion is the fulcrum of the force when the lid material is opened and the starting point of the step portion is the point of application of the force, the moment of the force is less than 60 N mm.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022034527 | 2022-03-07 | ||
| JP2022034527 | 2022-03-07 | ||
| PCT/JP2022/041852 WO2023171038A1 (en) | 2022-03-07 | 2022-11-10 | Container and container manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPWO2023171038A1 JPWO2023171038A1 (en) | 2023-09-14 |
| JP7735532B2 true JP7735532B2 (en) | 2025-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2024505888A Active JP7735532B2 (en) | 2022-03-07 | 2022-11-10 | Container and container manufacturing method |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4491526A4 (en) |
| JP (1) | JP7735532B2 (en) |
| CN (1) | CN118679103A (en) |
| WO (1) | WO2023171038A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3060975U (en) | 1999-01-22 | 1999-09-14 | 十條セントラル株式会社 | Paper cup with flat flange |
| JP2007210639A (en) | 2006-02-09 | 2007-08-23 | Dainippon Printing Co Ltd | Paper cup |
| JP2013249117A (en) | 2012-06-01 | 2013-12-12 | Toppan Printing Co Ltd | Paper container having increased flange strength |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5726315U (en) * | 1980-07-23 | 1982-02-10 | ||
| JPH0739649U (en) * | 1993-12-27 | 1995-07-18 | 東罐興業株式会社 | Cup-shaped container |
| JP2004042987A (en) * | 2002-07-15 | 2004-02-12 | Toppan Printing Co Ltd | Beverage paper cup and method for producing the same |
| FI122195B (en) | 2004-07-26 | 2011-10-14 | Stora Enso Oyj | Method of forming an orifice roll for a cup consisting of plastic-coated cardboard |
| JP6136125B2 (en) * | 2012-06-21 | 2017-05-31 | 凸版印刷株式会社 | Cup type paper container |
| JP6194661B2 (en) * | 2013-07-04 | 2017-09-13 | 凸版印刷株式会社 | Paper cup flange mold |
| JP6315728B2 (en) * | 2014-07-24 | 2018-04-25 | 東罐興業株式会社 | Container and container manufacturing method |
| CN208291655U (en) * | 2018-03-23 | 2018-12-28 | 朱永源 | Rolled edged paper container and paper material used to make the rolled edged paper container |
| KR20210077602A (en) * | 2019-12-17 | 2021-06-25 | 쇼와 덴코 패키징 가부시키가이샤 | Cup shaped container |
-
2022
- 2022-11-10 CN CN202280091426.5A patent/CN118679103A/en active Pending
- 2022-11-10 WO PCT/JP2022/041852 patent/WO2023171038A1/en not_active Ceased
- 2022-11-10 JP JP2024505888A patent/JP7735532B2/en active Active
- 2022-11-10 EP EP22931010.7A patent/EP4491526A4/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3060975U (en) | 1999-01-22 | 1999-09-14 | 十條セントラル株式会社 | Paper cup with flat flange |
| JP2007210639A (en) | 2006-02-09 | 2007-08-23 | Dainippon Printing Co Ltd | Paper cup |
| JP2013249117A (en) | 2012-06-01 | 2013-12-12 | Toppan Printing Co Ltd | Paper container having increased flange strength |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4491526A4 (en) | 2026-03-25 |
| JPWO2023171038A1 (en) | 2023-09-14 |
| CN118679103A (en) | 2024-09-20 |
| EP4491526A1 (en) | 2025-01-15 |
| WO2023171038A1 (en) | 2023-09-14 |
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