JP2003320598A - Machine and method for forming paper cup, and method for joining resin coating surface - Google Patents
Machine and method for forming paper cup, and method for joining resin coating surfaceInfo
- Publication number
- JP2003320598A JP2003320598A JP2002128559A JP2002128559A JP2003320598A JP 2003320598 A JP2003320598 A JP 2003320598A JP 2002128559 A JP2002128559 A JP 2002128559A JP 2002128559 A JP2002128559 A JP 2002128559A JP 2003320598 A JP2003320598 A JP 2003320598A
- Authority
- JP
- Japan
- Prior art keywords
- joining
- bottom plate
- bottom end
- peripheral surface
- heating
- 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.)
- Granted
Links
Landscapes
- Making Paper Articles (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、紙カップの胴部と
底板とを接合する成形機及び成形方法、並びにそれらに
用いて好適な樹脂コート面の接合方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding machine and a molding method for bonding a body of a paper cup and a bottom plate, and a method for bonding a resin coated surface suitable for use in them.
【０００２】[0002]
【従来の技術】紙を樹脂にてコートした素材を接合して
各種の容器を形成する場合、樹脂コート層を加熱して溶
融させた状態で接合面同士を圧着する方法が多用されて
いる。樹脂コート層の加熱方法としては、接合面にホッ
トエアを吹き付けるホットエア加熱、又は接合面を炎
（フレーム）で炙るフレーム加熱がある。2. Description of the Related Art In the case of joining various materials coated with resin on paper to form various containers, a method is widely used in which the joining surfaces are pressure-bonded to each other while the resin coating layer is heated and melted. As a method for heating the resin coating layer, there are hot air heating in which hot air is blown onto the joint surface, or flame heating in which the joint surface is burnt with a flame.
【０００３】[0003]
【発明が解決しようとする課題】近年、紙カップを電子
レンジ用の容器として使用することが検討されている。
そのような用途に向けられた紙カップにおいては、従来
の紙カップよりも高い耐熱性、耐水性が必要となり、そ
のために、素材の紙にコートされる樹脂材料も従来品よ
りも融点の高い材料が使用される。例えばポリプロピレ
ン樹脂が紙カップの内面のコート材として検討されてい
る。Recently, the use of a paper cup as a container for a microwave oven has been studied.
Paper cups intended for such applications require higher heat resistance and water resistance than conventional paper cups, and as a result, the resin material used to coat the material paper also has a higher melting point than conventional products. To be done. For example, polypropylene resin has been studied as a coating material for the inner surface of a paper cup.
【０００４】しかしながら、ポリプロピレン樹脂がコー
トされた素材を従来の成形機にて成形した場合、樹脂コ
ート層にて覆われた面同士、又は樹脂コート層にて覆わ
れた面と紙素材が露出した面との間で接合不良やシール
不良が生じることがあった。However, when a material coated with polypropylene resin is molded by a conventional molding machine, the surfaces covered with the resin coating layer or the surface covered with the resin coating layer and the paper material are exposed. There was a case where a joint failure or a seal failure occurred between the surfaces.
【０００５】そこで、本発明は、ポリプロピレン樹脂が
コート層に使用されている紙カップの成形に好適な紙カ
ップ成形機及び成形方法を提供することを目的とする。
また、ポリプロピレン樹脂製のコート面を有する素材に
適した接合方法を提供することも目的とする。Therefore, an object of the present invention is to provide a paper cup molding machine and a molding method suitable for molding a paper cup in which a polypropylene resin is used for a coat layer.
It is also an object to provide a joining method suitable for a material having a coated surface made of polypropylene resin.
【０００６】[0006]
【課題を解決するための手段】本発明は、以下に述べる
ような成形機、成形方法及び接合方法により上述した課
題を解決する。なお、ここにおいて、本発明の理解を容
易にするために添付図面の参照符号を括弧書きにて付記
するが、それにより本発明が図示の形態に限定されるも
のではない。The present invention solves the above-mentioned problems by a molding machine, a molding method and a joining method as described below. Here, in order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated forms.
【０００７】本発明の紙カップの成形機は、内面に樹脂
コート層（１２）が形成された紙製の胴部（３）の底端
部（３ａ）の内側に、内面に樹脂コート層（１４）が形
成されかつ外周に筒状の折り返し部（６ａ）が設けられ
た紙製の底板（６）を接合するための紙カップ（１０）
の成形機（２０）において、前記底端部の内周面のう
ち、前記折り返し部の外周面に対する接合部分（Ａ）を
ホットエアにより加熱する第１の加熱装置（３５）と、
前記第１の加熱装置に後続して設けられ、前記底端部の
内周面のうち、前記折り返し部の内周面に対する接合部
分（Ｂ）をフレームにより加熱する第２の加熱装置（３
７）と、を具備することにより、上述した課題を解決す
る。In the paper cup molding machine of the present invention, the resin coat layer (14) is formed on the inner surface inside the bottom end (3a) of the body (3) made of paper having the resin coat layer (12) formed on the inner surface. ) Is formed and a paper cup (10) for joining a paper bottom plate (6) having a cylindrical folded portion (6a) on the outer periphery thereof is joined.
In the molding machine (20), a first heating device (35) for heating the joint portion (A) of the inner peripheral surface of the bottom end portion to the outer peripheral surface of the folded portion with hot air,
A second heating device (3) that is provided subsequent to the first heating device and heats a joint portion (B) of the inner peripheral surface of the bottom end portion to the inner peripheral surface of the folded portion by a frame.
By providing 7) and, the above-mentioned problems can be solved.
【０００８】この発明の成形機によれば、胴部の底端部
の内周面と、底板の折り返し部の外周面とがホットエア
加熱に基づいて接合される。一方、胴部の底端部のう
ち、底板の折り返し部を包むように折り曲げられる部分
と、底板の折り返し部の内周面とがフレーム加熱に基づ
いて接合される。発明者らの検討によれば、樹脂コート
層にポリプロピレン樹脂を使用した場合、樹脂同士の接
合面に関してはホットエア加熱が適しており、樹脂と紙
との接合面に関してはフレーム加熱が適していることが
見出されている。また、胴部及び底板の素材の内面側の
みがポリプロピレン樹脂にてコートされている場合にお
いては、底板の折り返し部の外周面側は樹脂コート層同
士の接合面となり、底板の折り返し部の内周面側は、底
板のカップ原紙と胴部内面の樹脂コート層との接合面と
なる。According to the molding machine of the present invention, the inner peripheral surface of the bottom end portion of the body portion and the outer peripheral surface of the folded portion of the bottom plate are joined by hot air heating. On the other hand, a portion of the bottom end of the body portion that is bent so as to wrap around the folded-back portion of the bottom plate and the inner peripheral surface of the folded-back portion of the bottom plate are joined based on frame heating. According to the study by the inventors, when polypropylene resin is used for the resin coating layer, hot air heating is suitable for the joint surface between the resins and frame heating is suitable for the joint surface between the resin and the paper. Have been found. Also, when only the inner surface side of the body of the body and the bottom plate is coated with polypropylene resin, the outer peripheral surface side of the folded-back portion of the bottom plate is the joining surface of the resin coating layers, and the inner peripheral surface of the folded-back portion of the bottom plate is The surface side is a joint surface between the cup base paper of the bottom plate and the resin coat layer on the inner surface of the body.
【０００９】従って、本発明の成形機は、内面側がポリ
プロピレン樹脂にてコートされ、外面側には紙が露出し
ている紙カップの胴部及び底板の接合に適用された場合
において、底板の折り返し部の内外に対する胴部側の接
合面を、接合相手が紙か樹脂コート層かに応じて区別し
て最適な方法で加熱することができる。これにより、底
板の折り返し部の内外を確実に胴部と接合することがで
き、信頼性の高いシール構造を得ることができる。Therefore, in the molding machine of the present invention, when the inner surface side is coated with polypropylene resin and the outer surface side is exposed to the paper, the folded portion of the bottom plate is applied to the body part of the paper cup and the bottom plate. The joint surface on the body side with respect to the inside and outside can be heated by an optimum method by distinguishing depending on whether the joint partner is paper or the resin coating layer. As a result, the inside and outside of the folded portion of the bottom plate can be reliably joined to the body portion, and a highly reliable seal structure can be obtained.
【００１０】なお、ポリプロピレン樹脂と紙との接合部
分に関してフレーム加熱が適している理由は必ずしも明
らかではないが、フレームを生成するガスの酸化力が接
合作用に関して好結果をもたらしているものと推測され
る。Although the reason why flame heating is suitable for the joint between the polypropylene resin and the paper is not always clear, it is presumed that the oxidizing power of the gas that forms the flame brings about good results in terms of the joint action. It
【００１１】本発明の成形機において、前記第１の加熱
装置及び前記第２の加熱装置による各接合部分（Ａ，
Ｂ）の加熱は胴部の前記底端部の内側に前記底板を配置
した状態で行われてもよい。この場合には、加熱後、直
ちに底板の曲げ加工や締め付け処理に移ることができて
好ましい。但し、前記第１の加熱装置による加熱時に
は、前記折り返し部の外周面に対する接合部分（Ａ）が
露出するように前記底板が前記胴部の上端側に後退し、
前記第２の加熱装置による加熱時には、前記折り返し部
の外周面と前記第１の加熱装置による加熱対象の前記接
合部分とが対向する本来の位置まで前記底板が前記底端
部側へ移されるようにする。このように、第１の加熱装
置による加熱時において、底板を胴部の上端側へずらし
ておけば、底板に邪魔されることなく折り返し部外周面
に対する胴部内周の接合部分を加熱することができる。
また、第２の加熱装置による加熱時に底板を本来の位置
に戻すことにより、第１の加熱装置にて加熱された接合
部分からの熱の逃げを抑えることができる。In the molding machine of the present invention, each of the joining portions (A, A, B) formed by the first heating device and the second heating device.
The heating of B) may be performed in a state where the bottom plate is arranged inside the bottom end of the body. In this case, it is preferable that after the heating, the bottom plate can be immediately bent and tightened. However, at the time of heating by the first heating device, the bottom plate is retracted to the upper end side of the body portion so that the joining portion (A) to the outer peripheral surface of the folded portion is exposed,
During heating by the second heating device, the bottom plate is moved to the bottom end side to an original position where the outer peripheral surface of the folded portion and the joint portion to be heated by the first heating device face each other. To As described above, when the bottom plate is displaced toward the upper end side of the body portion during the heating by the first heating device, the joint portion of the inner periphery of the body portion with respect to the outer circumferential surface of the folded portion can be heated without being disturbed by the bottom plate. it can.
Further, by returning the bottom plate to the original position during heating by the second heating device, it is possible to suppress the escape of heat from the joint portion heated by the first heating device.
【００１２】本発明の紙カップの成形方法は、内面にポ
リプロピレン樹脂製のコート層（１２）が形成され、外
面にカップ原紙（１１）が露出した胴部（３）の底端部
（３ａ）の内側に、内面にポリプロピレン樹脂製のコー
ト層（１４）が形成され、外面にカップ原紙（１３）が
露出し、かつ外周に筒状の折り返し部（６ａ）が設けら
れた底板（６）を接合するための紙カップ（１０）の成
形方法において、前記胴部の底端部の内周面のうち前記
底板の折り返し部の外周面と接合される部分（Ａ）をホ
ットエアにて加熱する工程と、前記胴部の底端部の内周
面のうち前記底板の折り返し部の内周面と接合される部
分（Ｂ）をフレームにて加熱する工程と、加熱された底
端部を、前記底板の折り返し部が包み込まれるように内
方に折り曲げる工程と、前記底板の前記折り返し部を包
み込んだ底端部を全周に亘って半径方向に締め付ける工
程と、を備えたことを特徴とする。According to the method of molding a paper cup of the present invention, a polypropylene resin coating layer (12) is formed on the inner surface and the cup base paper (11) is exposed on the outer surface of the bottom end portion (3a) of the body portion (3). A bottom plate (6) having a polypropylene resin coat layer (14) formed on the inner surface, a cup base paper (13) exposed on the outer surface, and a cylindrical folded portion (6a) provided on the outer surface is joined to the inside. In the method for forming a paper cup (10) for doing so, heating a portion (A) of the inner peripheral surface of the bottom end portion of the body portion joined to the outer peripheral surface of the folded portion of the bottom plate with hot air, Of the inner peripheral surface of the bottom end of the body portion, a portion (B) that is joined to the inner peripheral surface of the folded portion of the bottom plate is heated by a frame, and the heated bottom end of the bottom plate is A process of bending inward so that the folded part is wrapped When, characterized in that and a step of tightening in the radial direction over the bottom end of wrapping the folded portion of the bottom plate the entire circumference.
【００１３】この方法によれば、ポリプロピレン樹脂同
士の接合部分がホットエア加熱にて接合され、ポリプロ
ピレン樹脂とカップ原紙との接合部分がフレーム加熱に
て接合される。従って、上述した通り、底板の折り返し
部の内外を確実に胴部と接合することができ、信頼性の
高いシール構造を得ることができる。According to this method, the joining portions of polypropylene resins are joined by hot air heating, and the joining portions of polypropylene resin and cup base paper are joined by frame heating. Therefore, as described above, the inside and outside of the folded portion of the bottom plate can be reliably joined to the body portion, and a highly reliable seal structure can be obtained.
【００１４】本発明の他の紙カップの成形方法は、ポリ
プロピレン樹脂同士が接する第１の接合部分と、ポリプ
ロピレン樹脂と紙とが接する第２の接合部分とが混在す
る紙カップの成形方法において、前記第１の接合部分は
ホットエアにて加熱し、前記第２の接合部分はフレーム
にて加熱することを特徴とするものである。Another method of molding a paper cup according to the present invention is the method of molding a paper cup in which a first joint portion where polypropylene resins are in contact with each other and a second joint portion where polypropylene resin is in contact with paper are mixed. The first joint portion is heated by hot air, and the second joint portion is heated by a frame.
【００１５】この成形方法によれば、接合面の状態に応
じてホットエア加熱とフレーム加熱とが使い分けられる
ので、胴部と底板との接合部分はもとより、それ以外の
カップ素材同士の接合部分を確実に接合し、信頼性の高
いシール構造を得ることができる。例えば、胴部の重ね
合わせ部分（１Ａ）に関しては、ポリプロピレン樹脂と
カップ原紙との接合部分であるため、フレーム加熱によ
って確実に接合できる。According to this molding method, hot air heating and frame heating are selectively used according to the condition of the joint surfaces, so that not only the joint portion between the body and the bottom plate but also the joint portion between the cup materials other than that can be surely performed. And a highly reliable seal structure can be obtained. For example, since the overlapping portion (1A) of the body portion is the joining portion between the polypropylene resin and the cup base paper, it can be reliably joined by heating the frame.
【００１６】本発明の樹脂コート面の接合方法は、ポリ
プロピレン樹脂にてコートされた一対の接合面同士を接
合する接合方法において、少なくともいずれか一方の接
合面をホットエアにて加熱し、その後に接合面を相互に
押し付けることを特徴とする。また、本発明の他の樹脂
コート面の接合方法は、ポリプロピレン樹脂にてコート
された第１の接合面と、紙が露出した第２の接合面とを
接合する接合方法において、少なくともいずれか一方の
接合面をフレームにて加熱し、その後に接合面同士を相
互に押し付けることを特徴とする。The method for joining resin-coated surfaces according to the present invention is a joining method for joining a pair of joining surfaces coated with polypropylene resin, wherein at least one of the joining surfaces is heated with hot air and then joined. The feature is that the surfaces are pressed against each other. Another resin-coated surface joining method of the present invention is at least one of a joining method for joining a first joining surface coated with a polypropylene resin and a second joining surface where paper is exposed. The joint surfaces are heated by a frame, and then the joint surfaces are pressed against each other.
【００１７】これらの接合方法によれば、ポリプロピレ
ン樹脂同士の接合部分、又はポリプロピレン樹脂と紙と
の接合部分に対して、ホットエア加熱又はフレーム加熱
を適切に使用して確実な接合を行い、それにより信頼性
の高いシール構造を得ることができる。According to these joining methods, the joining portion between the polypropylene resins or the joining portion between the polypropylene resin and the paper is securely joined by appropriately using hot air heating or frame heating. A highly reliable seal structure can be obtained.
【００１８】[0018]
【発明の実施の形態】図１は本発明の接合方法を利用し
た紙カップの成形方法の概要を示している。図１におい
て、少なくとも片面にポリプロピレンからなる樹脂コー
ト層が設けられたカップ原紙がカップの胴部の展開形状
に打ち抜かれてブランク１が形成される。そのブランク
１は不図示のマンドレル上で樹脂コート層が内面となる
ように筒状に巻かれてその両側縁が所定幅で重ね合わさ
れる。その重ね合わせ部１Ａはガスノズル２から吹き出
す燃焼ガスに着火して生成したフレーム２ａにて炙ら
れ、それにより樹脂コート層がその融点以上に加熱され
る。その加熱状態で不図示のこてが重ね合わせ部１Ａに
押し当てられ、それにより胴部３が成形される。一方、
ブランク１と同一材料の連続帯材４から円板５を打ち抜
き、この円板５の外周を筒状に曲げ加工して折り返し部
６ａを有する底板６を成形する。なお、折り返し部６ａ
は、ポリプロピレンからなる樹脂コート層が形成されて
いない側に向かって曲げられる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an outline of a method of molding a paper cup using the joining method of the present invention. In FIG. 1, a cup base paper having a resin coating layer made of polypropylene on at least one surface is punched into a developed shape of a body portion of a cup to form a blank 1. The blank 1 is cylindrically wound on a mandrel (not shown) so that the resin coat layer is the inner surface, and both side edges thereof are overlapped with a predetermined width. The overlapping portion 1A is ignited by the flame 2a generated by igniting the combustion gas blown out from the gas nozzle 2, whereby the resin coating layer is heated to its melting point or higher. A trowel (not shown) is pressed against the overlapping portion 1A in the heated state, whereby the body portion 3 is molded. on the other hand,
A circular plate 5 is punched out from a continuous strip 4 made of the same material as the blank 1, and the outer periphery of the circular plate 5 is bent into a tubular shape to form a bottom plate 6 having a folded-back portion 6a. The folded-back portion 6a
Is bent toward the side where the resin coat layer made of polypropylene is not formed.
【００１９】この底板６を胴部３の底端部３ａの内側に
配置し、底端部３ａの内周面のうち、折り返し部６ａの
外周面と接合される部分にホットエア７を吹き付けて樹
脂コート層を加熱する。続いて、底端部３ａの内周面の
うち、折り返し部６ａの内周面と接合される部分をガス
ノズル８から吹き出す燃焼ガスに着火して生成したフレ
ーム８ａにて炙って樹脂コート層を加熱する。次いで、
所定の型により胴部３の底端部３ａを、底板６の折り返
し部６ａが包み込まれるように内方に折り曲げる。その
後、折り曲げられた底端部３ａの外側を不図示の雌型に
て保持し、雄型としてのローラ９を底端部３ａの内側に
押し当てて底端部３ａを半径方向に締め付けつつ、その
ローラ９を周方向に旋回させて底端部３ａと底板６の折
り返し部６ａとを接合させる。さらに、胴部３の上端部
３ｂを外側にカールさせる。以上の処理により紙カップ
１０が成形される。The bottom plate 6 is disposed inside the bottom end 3a of the body 3, and hot air 7 is blown to the portion of the inner peripheral surface of the bottom end 3a that is joined to the outer peripheral surface of the folded portion 6a to blow the resin. Heat the coat layer. Then, of the inner peripheral surface of the bottom end portion 3a, a portion joined to the inner peripheral surface of the folded-back portion 6a is ignited by a combustion gas blown from the gas nozzle 8 to generate a flame 8a, which heats the resin coating layer. To do. Then
The bottom end portion 3a of the body portion 3 is bent inward by a predetermined mold so that the folded-back portion 6a of the bottom plate 6 is wrapped. After that, the outside of the bent bottom end 3a is held by a female mold (not shown), and the male roller 9 is pressed against the inside of the bottom end 3a to tighten the bottom end 3a in the radial direction, The roller 9 is rotated in the circumferential direction to join the bottom end portion 3a and the folded-back portion 6a of the bottom plate 6 to each other. Further, the upper end portion 3b of the body portion 3 is curled outward. The paper cup 10 is molded by the above processing.
【００２０】図２は以上のようにして成形される紙カッ
プ１０の接合部分を示し、（ａ）は胴部３の重ね合わせ
部１Ａの拡大図、（ｂ）は糸尻部分の拡大図である。図
２（ａ）に示すように、重ね合わせ部１Ａにおいては、
外周側に配置されるカップ原紙１１の樹脂コート層１２
と、内周側に配置されるカップ原紙１１とが接合され
る。一方、図２（ｂ）に示すように、糸尻部分において
は、底板６のカップ原紙１３の内面側に樹脂コート層１
４が設けられているため、折り返し部６ａの外周には樹
脂コート層１４が露出し、折り返し部６ａの内周にはカ
ップ原紙１３が露出する。一方、胴部３の底端部３ａの
折り返し部６ａとの接合部分には、折り返し部６ａの内
外いずれの側においても樹脂コート層１２が露出する。
従って、折り返し部６ａの外周側では樹脂コート層１
２，１４が接合され、折り返し部６ｂの内周側では樹脂
コート層１２とカップ原紙１３とが接合される。FIG. 2 shows a joint portion of the paper cup 10 molded as described above, (a) is an enlarged view of the overlapping portion 1A of the body portion 3, and (b) is an enlarged view of the thread tail portion. . As shown in FIG. 2A, in the overlapping portion 1A,
Resin coating layer 12 of cup base paper 11 arranged on the outer peripheral side
Then, the cup base paper 11 arranged on the inner peripheral side is joined. On the other hand, as shown in FIG. 2B, the resin coat layer 1 is formed on the inner surface side of the cup base paper 13 of the bottom plate 6 in the thread tail portion.
4 is provided, the resin coating layer 14 is exposed on the outer periphery of the folded-back portion 6a, and the cup base paper 13 is exposed on the inner periphery of the folded-back portion 6a. On the other hand, the resin coating layer 12 is exposed at the joint portion of the bottom end portion 3a of the body portion 3 with the folded-back portion 6a on both the inside and outside of the folded-back portion 6a.
Therefore, the resin coating layer 1 is provided on the outer peripheral side of the folded-back portion 6a.
2, 14 are joined, and the resin coat layer 12 and the cup base paper 13 are joined on the inner peripheral side of the folded-back portion 6b.
【００２１】発明者らの検討によれば、ポリプロピレン
を樹脂コート層１２，１４に使用した場合、樹脂コート
層１２とカップ原紙１１，１３との接合部分と、樹脂コ
ート層１２，１４の接合部分とでは適切な加熱方法が異
なることが見出された。すなわち、樹脂コート層１２と
カップ原紙１１，１３との接合部分に関してはフレーム
にてその接合部分を加熱することが望ましく、樹脂コー
ト層１２，１４の接合部分に関してはホットエアにてそ
の接合部分を加熱することが望ましい。従って、図１の
手順においては、胴部３の重ね合わせ部１Ａの貼り合わ
せの際にフレーム２ａを利用して接合部分を加熱してい
る。また、胴部３と底板６との接合部分に関しては、胴
部３の底端部３ａの内周面のうち、折り返し部６ａの外
周との接合部分はホットエア７にてその接合部分を加熱
し、折り返し部６ａの内周との接合部分はフレーム８ａ
にてその接合部分を加熱している。According to the study by the inventors, when polypropylene is used for the resin coat layers 12 and 14, the joint portion between the resin coat layer 12 and the cup base papers 11 and 13 and the joint portion between the resin coat layers 12 and 14. It was found that the appropriate heating methods differed between and. That is, it is desirable to heat the joint portion between the resin coat layer 12 and the cup base papers 11 and 13 with a frame, and to heat the joint portion between the resin coat layers 12 and 14 with hot air. It is desirable to do. Therefore, in the procedure of FIG. 1, the bonding portion is heated using the frame 2a when the overlapping portion 1A of the body portion 3 is bonded. Regarding the joint portion between the body portion 3 and the bottom plate 6, of the inner peripheral surface of the bottom end portion 3a of the body portion 3, the joint portion with the outer periphery of the folded portion 6a is heated with hot air 7. The joint portion with the inner circumference of the folded-back portion 6a is the frame 8a.
The joint is heated at.
【００２２】図３は、上述した紙カップの成形方法に使
用する成形機２０の一例を示している。図３の成形機２
０は、胴部３と底板６との接合を行うために設けられて
いる。成形機２０は水平に設置されたターレット２１を
有している。ターレット２１上には複数（図では８つ）
のマンドレル２２が周方向に等しいピッチで設けられて
いる。図４及び図５に示すように、マンドレル２２は、
胴部３を上下に反転させた状態で保持可能な逆円錐型の
本体２２ａと、その本体２２ａの中心に上下方向へ移動
可能に配置されたスライダ２２ｂとを有している。FIG. 3 shows an example of a molding machine 20 used in the above-described method for molding a paper cup. Molding machine 2 of FIG.
0 is provided to join the body 3 and the bottom plate 6. The molding machine 20 has a turret 21 installed horizontally. Multiple on the turret 21 (eight in the figure)
Mandrels 22 are provided at equal pitches in the circumferential direction. As shown in FIGS. 4 and 5, the mandrel 22 is
The main body 22a has an inverted conical main body 22a that can be held in a state where the body 3 is turned upside down, and a slider 22b that is vertically movable at the center of the main body 22a.
【００２３】ターレット２１は、不図示の駆動装置によ
り、マンドレル２２のピッチ（図示例では４５°）ずつ
間欠的に回転駆動される。なお、図３では、各マンドレ
ル２２の停止位置をＰ１〜Ｐ８にて示す。停止位置Ｐ１
には、不図示の底板成形装置にて成形された底板６を、
その折り返し部６ａが上を向くようにしてマンドレル２
２の上端に供給する底板供給装置３１が設けられてい
る。また、停止位置Ｐ３には、不図示の胴部成形装置に
て成形された胴部３を、底板６が供給されたマンドレル
２２に対して上下に反転した状態で被せる胴部供給装置
３３が設けられている。この胴部供給装置３３にて胴部
３がマンドレル２２に被せられることにより、胴部３の
底端部３ａの内側に底板６が配置される。The turret 21 is driven to rotate intermittently by a pitch (45 ° in the illustrated example) of the mandrel 22 by a driving device (not shown). In FIG. 3, the stop positions of the mandrels 22 are indicated by P1 to P8. Stop position P1
Is a bottom plate 6 molded by a bottom plate molding device (not shown),
The mandrel 2 with its folded-back portion 6a facing upward
A bottom plate supply device 31 for supplying the upper end of the second plate 2 is provided. Further, at the stop position P3, there is provided a body part supply device 33 for covering the mandrel 22 supplied with the bottom plate 6 with the body part 3 formed by a body part forming device (not shown) being turned upside down. Has been. By covering the mandrel 22 with the body part 3 by the body part supply device 33, the bottom plate 6 is arranged inside the bottom end part 3 a of the body part 3.
【００２４】停止位置Ｐ４には第１の加熱装置３５が設
けられている。図４に示すように、第１の加熱装置３５
は、胴部３の底端部３ａの内側にエアノズル３６を挿入
し、そのエアノズル３６から底端部３ａの内周面の全周
にホットエア７を吹き付けるものである。エアノズル３
６からのホットエア７の吹き付け位置は、底端部３ａの
内周面のうち、折り返し部６ａの外周面に対する接合部
分Ａに設定される。接合部分Ａへのホットエアの吹き付
けを可能とするため、第１の加熱装置３５においてマン
ドレル２２のスライダ２２ｂは本体２２ａ内に格納さ
れ、それにより底板６は図４に想像線６′で示す本来の
取付位置よりも胴部３の上端側（図４において下側）に
後退した位置に保持されている。なお、第１の加熱装置
３５にて吹き付けるホットエアの温度（但し、エアノズ
ル３６内部のヒーターの直後で測った値）は、５００°
Ｃ〜６５０°Ｃの範囲が好ましい。A first heating device 35 is provided at the stop position P4. As shown in FIG. 4, the first heating device 35
The air nozzle 36 is inserted inside the bottom end 3a of the body 3, and the hot air 7 is blown from the air nozzle 36 to the entire circumference of the inner peripheral surface of the bottom end 3a. Air nozzle 3
The position where the hot air 7 is blown from 6 is set to the joining portion A of the inner peripheral surface of the bottom end portion 3a to the outer peripheral surface of the folded-back portion 6a. The slider 22b of the mandrel 22 is housed in the main body 22a in the first heating device 35 in order to enable the blowing of hot air onto the joint A, so that the bottom plate 6 is shown in phantom line 6'in FIG. It is held at a position retracted to the upper end side (lower side in FIG. 4) of the body 3 with respect to the mounting position. The temperature of the hot air blown by the first heating device 35 (however, the value measured immediately after the heater inside the air nozzle 36) is 500 °.
The range of C to 650 ° C is preferable.
【００２５】図３に示すように、停止位置Ｐ５には第２
の加熱装置３７が設けられている。図５に示すように、
第２の加熱装置３７は、胴部３の底端部３ａの内側にガ
スノズル８を挿入し、そのガスノズル８から吹き出すフ
レーム８ａにて底端部３ａの内周面をその全周に亘って
炙るものである。フレーム８ａによる加熱位置は、底端
部３ａの内周面のうち、折り返し部６ａの内周面に対す
る接合部分Ｂに設定される。なお、接合部分Ｂは、胴部
３の底端部３ａのうち折り返し部６ａを包むように曲げ
返される部分に相当する。As shown in FIG. 3, a second position is provided at the stop position P5.
The heating device 37 is provided. As shown in FIG.
In the second heating device 37, the gas nozzle 8 is inserted inside the bottom end portion 3a of the body portion 3, and the inner peripheral surface of the bottom end portion 3a is grilled over the entire circumference by the frame 8a blown out from the gas nozzle 8. It is a thing. The heating position by the frame 8a is set to the joining portion B of the inner peripheral surface of the bottom end portion 3a to the inner peripheral surface of the folded portion 6a. The joint portion B corresponds to a portion of the bottom end portion 3a of the body portion 3 which is bent back so as to wrap around the folded portion 6a.
【００２６】第２の加熱装置３７への搬入時においてマ
ンドレル２２のスライダ２２ｂは本体２２ａから所定量
上方へ突出する。それにより、底板６は図４に想像線
６′で示す本来の取付位置に押し上げられ、その折り返
し部６ａの外周面は第１の加熱装置３５にて加熱された
底端部３ａの内周面の接合部分Ａ（図４参照）と対向す
る。こうしたスライダ２２ｂの動作は、例えば停止位置
Ｐ５にスライダ２２ｂが乗り上げるカムを配置して実現
することができる。図７（ａ）に示すように、ノホット
エアを供給するエアノズル３６にフランジ状の押し込み
部３６ａを設け、接合部分Ａの加熱後に同図（ｂ）に示
すようにエアノズル３６を底板６側に押し込んで胴部３
の底端部３ａを押し込み部３６ａにて接合部分Ｂの幅相
当だけ押し込むようにしてもよい。エアノズル３６に代
え、ガスノズル８に同様の押し込み部を設け、ガスノズ
ル８を底端部３ａの内側に挿入する際にその押し込み部
を底端部３ａと接触させて胴部３を押し込むようにして
もよい。The slider 22b of the mandrel 22 projects upward from the main body 22a by a predetermined amount when being carried into the second heating device 37. As a result, the bottom plate 6 is pushed up to the original mounting position shown by the imaginary line 6'in FIG. 4, and the outer peripheral surface of the folded portion 6a is the inner peripheral surface of the bottom end portion 3a heated by the first heating device 35. Facing the joint part A (see FIG. 4). Such an operation of the slider 22b can be realized by disposing a cam on which the slider 22b rides at the stop position P5, for example. As shown in FIG. 7 (a), a flange-shaped pushing portion 36a is provided in the air nozzle 36 for supplying the no-hot air, and after heating the joint portion A, the air nozzle 36 is pushed toward the bottom plate 6 side as shown in FIG. 7 (b). Torso 3
Alternatively, the bottom end portion 3a may be pushed by the pushing portion 36a by the width corresponding to the joint portion B. Even if the gas nozzle 8 is provided with a similar push-in portion instead of the air nozzle 36 and the push-in portion is brought into contact with the bottom end portion 3a when the gas nozzle 8 is inserted inside the bottom end portion 3a, the body portion 3 is pushed in. Good.
【００２７】なお、第２の加熱装置３７の発熱量は例え
ば６０００ｋｃａｌ／時に設定される。この発熱量は電
熱ヒータにして７ＫＷに相当する。ガスノズル８に供給
する燃焼ガスは例えばプロパンガスを使用することがで
きる。そのプロパンガスの圧力は０．３ｋＰａに設定で
きる。ガスノズル８には燃焼用のエアが併せて供給され
るが、そのエア圧は例えば２ｋＰａに設定される。The amount of heat generated by the second heating device 37 is set to, for example, 6000 kcal / hour. This amount of heat generation corresponds to 7 KW for an electric heater. The combustion gas supplied to the gas nozzle 8 may be propane gas, for example. The pressure of the propane gas can be set to 0.3 kPa. Combustion air is also supplied to the gas nozzle 8, and the air pressure is set to, for example, 2 kPa.
【００２８】図３に戻って、第２の加熱装置３７に続く
停止位置Ｐ６，Ｐ７にはそれぞれ曲げ加工装置４１及び
締め付け装置４３が設けられている。曲げ加工装置４１
は、胴部３の底端部３ａを不図示の型により内側に曲げ
返す装置である（図１参照）。この曲げ加工装置４１の
処理により、底板６の折り返し部６ａが包み込まれるよ
うにして胴部３の底端部３ａが折り曲げられる。また、
締め付け装置４３は、図１のローラ９を利用して底端部
３ａをその全周に亘って半径方向に締め付ける装置であ
る。なお、ローラ９を利用した締め付け装置に代え、チ
ャックを利用して底端部３ａの全周を同時に締め付ける
タイプの締め付け装置を設けてもよい。ローラを利用し
た締め付け装置と、チャックを利用した締め付け装置と
を併設してもよい。Returning to FIG. 3, a bending device 41 and a tightening device 43 are provided at stop positions P6 and P7 following the second heating device 37, respectively. Bending device 41
Is a device that bends the bottom end 3a of the body 3 back inward with a mold (not shown) (see FIG. 1). By the processing of the bending device 41, the bottom end portion 3a of the body portion 3 is bent so that the folded-back portion 6a of the bottom plate 6 is wrapped. Also,
The tightening device 43 is a device that tightens the bottom end portion 3a in the radial direction over the entire circumference by using the roller 9 of FIG. Instead of the tightening device using the roller 9, a tightening device of the type that simultaneously tightens the entire circumference of the bottom end portion 3a using a chuck may be provided. A tightening device using a roller and a tightening device using a chuck may be provided together.
【００２９】締め付け装置４３による締め付けが行われ
た胴部３及び底板６は、ターレット２１の回転により、
図３の停止位置Ｐ８に移送される。その停止位置Ｐ８に
はマンドレル２２から胴部３及び底板６を抜き取る取り
出し装置４５が設けられている。取り出し装置４５にて
マンドレル２２から取り出された成形途中のカップは不
図示のカール装置に送られ、そこで胴部３の上端部３ｂ
にカール加工が施される。The body 3 and the bottom plate 6 tightened by the tightening device 43 are rotated by the rotation of the turret 21.
It is transferred to the stop position P8 in FIG. At the stop position P8, a take-out device 45 for taking out the body 3 and the bottom plate 6 from the mandrel 22 is provided. The molding cup taken out of the mandrel 22 by the take-out device 45 is sent to a curling device (not shown), and the upper end portion 3b of the body portion 3 is there.
Is curled.
【００３０】以上のように、成形機２０においては、底
端部３ａの内周の接合部分Ａをホットエアにて加熱する
第１の加熱装置３５と、底端部３ａの内周の接合部分Ｂ
をフレームにて加熱する第２の加熱装置３７とが設けら
れているので、図２（ｂ）に示した糸尻部分のうち、ポ
リプロピレン製の樹脂コート層１２，１４同士が接する
底端部３ａの内周面と折り返し部６ａの外周面とがホッ
トエア加熱に基づいて接合され、ポリプロピレン製の樹
脂コート層１２とカップ原紙１３とが接する底端部３ａ
と折り返し部６ａの内周面とがフレーム加熱に基づいて
接合される。これにより、接合面の組み合わせに応じた
適切な加熱方法を選択して各面を確実に接合し、それに
より信頼性の高いシール構造を得ることができる。As described above, in the molding machine 20, the first heating device 35 for heating the inner peripheral joint portion A of the bottom end portion 3a with hot air and the inner peripheral joint portion B of the bottom end portion 3a.
Since a second heating device 37 that heats the resin is provided in the frame, the bottom end 3a of the yarn tail portion shown in FIG. 2B where the polypropylene resin coat layers 12 and 14 are in contact with each other. Bottom end 3a where the polypropylene resin coat layer 12 and the cup base paper 13 are in contact with each other by the hot air heating of the inner peripheral surface of the cup and the outer peripheral surface of the folded portion 6a.
And the inner peripheral surface of the folded-back portion 6a are joined together by heating the frame. This makes it possible to select an appropriate heating method according to the combination of the joint surfaces and securely join the respective surfaces, thereby obtaining a highly reliable seal structure.
【００３１】以上の実施形態においては、マンドレル２
２のスライダ２２ｂを操作して底板６の位置を第１の加
熱装置３５と第２の加熱装置３７とで変化させたが、本
発明はそのような例に限らない。例えば図６に示すよう
に、折り返し部６ａを底端部３ａの内周面よりも内側に
僅かに大きく折り曲げておき、第１の加熱装置３５にお
いて、底端部３ａと折り返し部６ａとの間に生じている
隙間に向かってホットエア７を吹き付けるようにしても
よい。In the above embodiment, the mandrel 2
Although the position of the bottom plate 6 is changed by the first heating device 35 and the second heating device 37 by operating the second slider 22b, the present invention is not limited to such an example. For example, as shown in FIG. 6, the folded-back portion 6a is bent slightly inward from the inner peripheral surface of the bottom end portion 3a, and in the first heating device 35, between the bottom-end portion 3a and the folded-back portion 6a. You may make it blow the hot air 7 toward the clearance which has arisen.
【００３２】上記の実施形態では、隣接する停止位置Ｐ
４及びＰ５に加熱装置３５，３７を並べて設けたが、本
発明はそのような形態に限らない。例えば、同一の停止
位置にエアノズルとガスノズルを併置し、両ノズルを選
択的に加熱部分に差し込んでホットエア加熱とフレーム
加熱とを一箇所で済ませるようにしてもよい。つまり、
第１の加熱装置と第２の加熱装置とは同一位置に配置さ
れて一部（例えばカップを支持する部分）を共用する構
成としてもよい。In the above embodiment, the adjacent stop positions P
Although the heating devices 35 and 37 are provided side by side on 4 and P5, the present invention is not limited to such a form. For example, an air nozzle and a gas nozzle may be placed side by side at the same stop position, and both nozzles may be selectively inserted into a heating portion so that hot air heating and frame heating are completed at one place. That is,
The first heating device and the second heating device may be arranged at the same position and share a part (for example, a part supporting the cup).
【００３３】[0033]
【実施例】本発明に従ってホットエア加熱及びフレーム
加熱を順次行って紙カップの胴部と底板とを接合した。
使用した紙カップの胴部及び底板はいずれも内面にポリ
プロピレン樹脂製のコート層が形成されたものであり、
底板の折り返し部の外周面と胴部内面との接合部分は樹
脂コート層同士の接合面であり、底板の折り返し部の内
周面と胴部の底端部の折りし返し部分との接合部は樹脂
コート層とカップ原紙との接合面である。ホットエア加
熱時に供給するエアの圧力及び温度、フレーム加熱時に
供給するエア、燃焼ガス、混合ガスの圧力をそれぞれ変
化させて底板の接合を実施し、各条件について１００個
ずつ紙カップを製造して底板接合部から内容物の漏れが
確認できた個数を計数した。その結果を次表に示す。EXAMPLE Hot air heating and frame heating were sequentially performed according to the present invention to bond the body of the paper cup to the bottom plate.
Both the body and bottom plate of the paper cup used had a coat layer made of polypropylene resin on the inner surface,
The joint between the outer peripheral surface of the folded portion of the bottom plate and the inner surface of the body is the joint surface between the resin coating layers, and the joint between the inner peripheral surface of the folded portion of the bottom plate and the folded portion of the bottom end of the body. Is a joint surface between the resin coating layer and the cup base paper. The bottom plates are joined by changing the pressure and temperature of the air supplied when heating the hot air and the pressures of the air, combustion gas, and mixed gas that are supplied when heating the flame, and 100 paper cups are manufactured for each condition to join the bottom plates. The number of parts in which leakage of contents was confirmed was counted. The results are shown in the table below.
【００３４】[0034]
【表１】 [Table 1]
【００３５】この結果からみて、ホットエア加熱及びフ
レーム加熱のそれぞれの条件を適切に設定することによ
り、底板と胴部とを確実に接合できることが確認され
た。特にホットエアの温度としては、５００°Ｃ以上、
６５０°Ｃの範囲が好適であることが確認された（サン
プルＡ，Ｆを参照）。From these results, it was confirmed that the bottom plate and the body can be reliably joined by appropriately setting the conditions of hot air heating and flame heating. Especially, the temperature of hot air is 500 ° C or higher,
It was confirmed that the range of 650 ° C was suitable (see Samples A and F).
【００３６】[0036]
【発明の効果】以上に説明したように、本発明の成形機
によれば、底板の折り返し部の外周面とをホットエア加
熱に基づいて接合する一方、胴部の底端部のうち、底板
の折り返し部を包むように折り曲げられる部分と、底板
の折り返し部の内周面とをフレーム加熱に基づいて接合
することができる。従って、内面側がポリプロピレン樹
脂にてコートされ、外面側には紙が露出している紙カッ
プの胴部及び底板の接合に適用された場合において、底
板の折り返し部の内外に対する胴部側の接合面を、接合
相手が紙か樹脂コート層かに応じて区別して最適な方法
で加熱することができる。これにより、底板の折り返し
部の内外を確実に胴部と接合することができ、信頼性の
高いシール構造を得ることができる。As described above, according to the molding machine of the present invention, the outer peripheral surface of the folded portion of the bottom plate is joined by hot air heating, while the bottom plate of the bottom end of the body is The portion that is bent so as to wrap the folded portion and the inner peripheral surface of the folded portion of the bottom plate can be joined based on frame heating. Therefore, when the inner surface side is coated with polypropylene resin and the outer surface side is exposed to paper, when applied to the joining of the body part and the bottom plate of the paper cup, the joining surface of the body part side to the inside and outside of the folded part of the bottom plate The heating can be performed by an optimum method, depending on whether the joining partner is paper or the resin coating layer. As a result, the inside and outside of the folded portion of the bottom plate can be reliably joined to the body portion, and a highly reliable seal structure can be obtained.
【００３７】また、本発明の成形方法によれば、ポリプ
ロピレン樹脂同士の接合部分と、ポリプロピレン樹脂と
カップ原紙との接合部分とが混在する紙カップに対し
て、接合部分の組み合わせに適した加熱処理を施して各
接合面を確実に接合し、それにより信頼性の高いシール
構造を得ることができる。Further, according to the molding method of the present invention, a heat treatment suitable for a combination of joining portions is performed on a paper cup in which a joining portion between polypropylene resins and a joining portion between polypropylene resin and cup base paper are mixed. By doing so, the respective joint surfaces are surely joined to each other, whereby a highly reliable seal structure can be obtained.
【００３８】さらに、本発明の樹脂コート面の接合方法
によれば、ポリプロピレン樹脂がコート層に使用された
素材を確実に接合し、接合面のシール性能の信頼性を高
めることができる。Further, according to the joining method of the resin coated surface of the present invention, the material used for the coating layer of the polypropylene resin can be reliably joined to enhance the reliability of the sealing performance of the joining surface.
【図１】本発明の紙カップの成形方法の概略手順を示す
図。FIG. 1 is a diagram showing a schematic procedure of a method for molding a paper cup according to the present invention.
【図２】図１の方法により成形される紙カップの接合部
分を示し、（ａ）は胴部の重ね合わせ部の拡大図、
（ｂ）は糸尻部分の拡大図。2 is a view showing a joint portion of a paper cup molded by the method of FIG. 1, (a) is an enlarged view of an overlapping portion of a body portion, FIG.
(B) is an enlarged view of the thread tail portion.
【図３】図１の方法を実現するために使用される紙カッ
プの成形機の概略的な平面図。3 is a schematic plan view of a paper cup molding machine used to implement the method of FIG. 1;
【図４】図３の成形機に含まれる第１の加熱装置の概要
を示す断面図。4 is a cross-sectional view showing an outline of a first heating device included in the molding machine of FIG.
【図５】図３の成形機に含まれる第２の加熱装置の概要
を示す断面図。5 is a cross-sectional view showing the outline of a second heating device included in the molding machine of FIG.
【図６】第１の加熱装置の変形例を示す図。FIG. 6 is a view showing a modified example of the first heating device.
【図７】ホットエアによる加熱後に胴部と底板とを相対
的に移動させる構成に関する他の実施形態を示す図。FIG. 7 is a diagram showing another embodiment relating to a configuration in which a body and a bottom plate are relatively moved after heating with hot air.
３ 胴部
３ａ 底端部
６ 底板
６ａ 折り返し部
１０ 紙カップ
２０ 成形機
２１ ターレット
２２ マンドレル
３１ 底板供給装置
３３ 胴部供給装置
３５ 第１の加熱装置
３７ 第２の加熱装置
４１ 曲げ加工装置
４３ 締め付け装置
４５ 取り出し装置
Ａ 底板の折り返し部の外周面に対する底端部内周面の
接合部分
Ｂ 底板の折り返し部の内周面に対する底端部内周面の
接合部分3 Body part 3a Bottom end part 6 Bottom plate 6a Folding part 10 Paper cup 20 Forming machine 21 Turret 22 Mandrel 31 Bottom plate supply device 33 Body part supply device 35 First heating device 37 Second heating device 41 Bending device 43 Tightening device 45 Take-out device A Joint part of inner peripheral surface of bottom end part to outer peripheral surface of folded part of bottom plate B Joint part of inner peripheral surface of bottom end part to inner peripheral surface of folded part of bottom plate
───────────────────────────────────────────────────── フロントページの続き (72)発明者 佐竹 宏樹 東京都新宿区市谷加賀町一丁目１番１号 大日本印刷株式会社内 Ｆターム(参考） 3E075 AA09 BA33 CA01 DA32 DC62 DD12 DD32 DD42 DD43 FA06 GA04 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hiroki Satake 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd. F term (reference) 3E075 AA09 BA33 CA01 DA32 DC62 DD12 DD32 DD42 DD43 FA06 GA04
Claims (6)
胴部の底端部の内側に、内面に樹脂コート層が形成され
かつ外周に筒状の折り返し部が設けられた紙製の底板を
接合するための紙カップの成形機において、 前記底端部の内周面のうち、前記折り返し部の外周面に
対する接合部分をホットエアにより加熱する第１の加熱
装置と、 前記第１の加熱装置に後続して設けられ、前記底端部の
内周面のうち、前記折り返し部の内周面に対する接合部
分をフレームにより加熱する第２の加熱装置と、を具備
することを特徴とする紙カップの成形機。1. A paper-made body in which a resin coat layer is formed on the inner surface and a tubular folded portion is provided on the outer circumference, inside the bottom end of a body made of paper having a resin coat layer formed on the inner surface. In a paper cup molding machine for joining a bottom plate, a first heating device that heats a joining portion of the inner peripheral surface of the bottom end portion to the outer peripheral surface of the folded portion with hot air; and the first heating device. A second heating device that is provided subsequent to the second heating device and heats a joint portion of the inner peripheral surface of the bottom end portion to the inner peripheral surface of the folded portion by a frame. Molding machine.
装置による各接合部分の加熱が胴部の前記底端部の内側
に前記底板を配置した状態で行われ、かつ前記第１の加
熱装置による加熱時には、前記折り返し部の外周面に対
する接合部分が露出するように前記底板が前記胴部の上
端側に後退し、前記第２の加熱装置による加熱時には、
前記折り返し部の外周面と前記第１の加熱装置による加
熱対象の前記接合部分とが対向する本来の位置まで前記
底板が前記底端部側へ移されることを特徴とする請求項
１に記載の紙カップの成形機。2. The heating of each joint portion by the first heating device and the second heating device is performed in a state where the bottom plate is arranged inside the bottom end portion of the body portion, and At the time of heating by the heating device, the bottom plate recedes toward the upper end side of the body so that the joint portion to the outer peripheral surface of the folded portion is exposed, and at the time of heating by the second heating device,
The bottom plate is moved to the bottom end side to an original position where the outer peripheral surface of the folded-back portion and the joint portion to be heated by the first heating device face each other. Paper cup molding machine.
が形成され、外面にカップ原紙が露出した胴部の底端部
の内側に、内面にポリプロピレン樹脂製のコート層が形
成され、外面にカップ原紙が露出し、かつ外周に筒状の
折り返し部が設けられた底板を接合するための紙カップ
の成形方法において、 前記胴部の底端部の内周面のうち前記底板の折り返し部
の外周面と接合される部分をホットエアにて加熱する工
程と、 前記胴部の底端部の内周面のうち前記底板の折り返し部
の内周面と接合される部分をフレームにて加熱する工程
と、 加熱された底端部を、前記底板の折り返し部が包み込ま
れるように内方に折り曲げる工程と、 前記底板の前記折り返し部を包み込んだ底端部を全周に
亘って半径方向に締め付ける工程と、を備えたことを特
徴とする紙カップの成形方法。3. A coating layer made of polypropylene resin is formed on the inner surface, a coating layer made of polypropylene resin is formed on the inner surface inside the bottom end of the body portion where the cup raw paper is exposed on the outer surface, and the cup raw paper is formed on the outer surface. In the method of forming a paper cup for exposing and exposing a bottom plate provided with a cylindrical folded portion on the outer periphery, in the inner peripheral surface of the bottom end portion of the body portion and the outer peripheral surface of the folded portion of the bottom plate. Heating the portion to be joined with hot air; heating the portion of the inner peripheral surface of the bottom end of the body portion to be joined to the inner peripheral surface of the folded portion of the bottom plate with a frame; A step of inwardly bending the bottom end portion so that the folded-back portion of the bottom plate is wrapped, and a step of radially tightening the bottom end portion of the bottom plate wrapped around the folded-back portion over the entire circumference. Specially prepared Method of forming a paper cup to.
接合部分と、ポリプロピレン樹脂と紙とが接する第２の
接合部分とが混在する紙カップの成形方法において、 前記第１の接合部分はホットエアにて加熱し、前記第２
の接合部分はフレームにて加熱することを特徴とする紙
カップの成形方法。4. A method of molding a paper cup, wherein a first joint portion where polypropylene resins are in contact with each other and a second joint portion where polypropylene resin and paper are in contact with each other are provided, wherein the first joint portion is heated by hot air. And the second
The method for forming a paper cup is characterized in that the joint portion of is heated by a frame.
対の接合面同士を接合する接合方法において、 少なくともいずれか一方の接合面をホットエアにて加熱
し、その後に接合面を相互に押し付けることを特徴とす
る樹脂コート面の接合方法。5. A joining method for joining a pair of joining surfaces coated with polypropylene resin, wherein at least one of the joining surfaces is heated with hot air, and then the joining surfaces are pressed against each other. Method for joining resin coated surfaces.
１の接合面と、紙が露出した第２の接合面とを接合する
接合方法において、 少なくともいずれか一方の接合面をフレームにて加熱
し、その後に接合面同士を相互に押し付けることを特徴
とする樹脂コート面の接合方法。6. A joining method for joining a first joining surface coated with a polypropylene resin and a second joining surface having exposed paper, wherein at least one of the joining surfaces is heated by a frame, A method of joining resin-coated surfaces, characterized in that the joining surfaces are then pressed against each other.
Priority Applications (1)
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|---|---|---|---|
| JP2002128559A JP3971234B2 (en) | 2002-04-30 | 2002-04-30 | Paper cup molding machine and molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002128559A JP3971234B2 (en) | 2002-04-30 | 2002-04-30 | Paper cup molding machine and molding method |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2007107144A Division JP4566212B2 (en) | 2007-04-16 | 2007-04-16 | Paper container molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003320598A true JP2003320598A (en) | 2003-11-11 |
| JP3971234B2 JP3971234B2 (en) | 2007-09-05 |
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ID=29542273
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|---|---|---|---|
| JP2002128559A Expired - Fee Related JP3971234B2 (en) | 2002-04-30 | 2002-04-30 | Paper cup molding machine and molding method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007091323A (en) * | 2005-09-30 | 2007-04-12 | Tokan Kogyo Co Ltd | Cuplike paper container |
| JP2013220594A (en) * | 2012-04-17 | 2013-10-28 | Toppan Printing Co Ltd | Method of producing paper cup and heater nozzle for molding annular leg portion |
| CN107415319A (en) * | 2017-08-17 | 2017-12-01 | 海宁诚达机械有限公司 | A kind of bottom shaping mechanism of paper cup making machine |
-
2002
- 2002-04-30 JP JP2002128559A patent/JP3971234B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007091323A (en) * | 2005-09-30 | 2007-04-12 | Tokan Kogyo Co Ltd | Cuplike paper container |
| JP2013220594A (en) * | 2012-04-17 | 2013-10-28 | Toppan Printing Co Ltd | Method of producing paper cup and heater nozzle for molding annular leg portion |
| CN107415319A (en) * | 2017-08-17 | 2017-12-01 | 海宁诚达机械有限公司 | A kind of bottom shaping mechanism of paper cup making machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3971234B2 (en) | 2007-09-05 |
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