JP2003237855A - Heat-insulating paper cup - Google Patents
Heat-insulating paper cupInfo
- Publication number
- JP2003237855A JP2003237855A JP2002043827A JP2002043827A JP2003237855A JP 2003237855 A JP2003237855 A JP 2003237855A JP 2002043827 A JP2002043827 A JP 2002043827A JP 2002043827 A JP2002043827 A JP 2002043827A JP 2003237855 A JP2003237855 A JP 2003237855A
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- thermoplastic synthetic
- resin layer
- layer
- paper cup
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 103
- 239000000057 synthetic resin Substances 0.000 claims abstract description 103
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 99
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 99
- 239000000463 material Substances 0.000 claims abstract description 38
- 230000008018 melting Effects 0.000 claims abstract description 9
- 238000002844 melting Methods 0.000 claims abstract description 9
- 229920005672 polyolefin resin Polymers 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 abstract description 11
- 229920005989 resin Polymers 0.000 abstract description 8
- 239000011347 resin Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 238000005187 foaming Methods 0.000 description 17
- 238000007639 printing Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 13
- 229920001684 low density polyethylene Polymers 0.000 description 9
- 239000004702 low-density polyethylene Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000006260 foam Substances 0.000 description 8
- 229920001179 medium density polyethylene Polymers 0.000 description 8
- 239000004701 medium-density polyethylene Substances 0.000 description 8
- 229920013716 polyethylene resin Polymers 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000007646 gravure printing Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 238000009413 insulation Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 229920005990 polystyrene resin Polymers 0.000 description 3
- 238000003854 Surface Print Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000007765 extrusion coating Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 101100325793 Arabidopsis thaliana BCA2 gene Proteins 0.000 description 1
- 101100327917 Caenorhabditis elegans chup-1 gene Proteins 0.000 description 1
- 102100036738 Guanine nucleotide-binding protein subunit alpha-11 Human genes 0.000 description 1
- 101100283445 Homo sapiens GNA11 gene Proteins 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 241001122767 Theaceae Species 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000004794 expanded polystyrene Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 235000012171 hot beverage Nutrition 0.000 description 1
- 235000008446 instant noodles Nutrition 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、断熱紙カップに関
するものであり、さらに詳しくは、発泡した熱可塑性合
成樹脂層を有する断熱紙カップに関するものである。そ
して、本発明の断熱紙カップは、断熱容器として利用す
ることができるものである。TECHNICAL FIELD The present invention relates to a heat insulating paper cup, and more particularly to a heat insulating paper cup having a foamed thermoplastic synthetic resin layer. The heat insulating paper cup of the present invention can be used as a heat insulating container.
【０００２】[0002]
【従来の技術】断熱性カップとしては、発泡性を持つ合
成樹脂、とくに発泡ポリスチレン樹脂を原料とするもの
が、多く使用されている。また、紙カップの全周に波形
状などの紙製の胴巻きをした形のもの、あるいは内側と
外側の二重構造とし、二層間に空間を持たせた形のも
の、そして、紙の両面を熱可塑性合成樹脂層としてポリ
エチレン樹脂層で積層した材料を使用し、その紙カップ
の表面のポリエチレン樹脂層を発泡させたものなどがあ
る。2. Description of the Related Art As a heat insulating cup, a synthetic resin having a foaming property, particularly a foaming polystyrene resin as a raw material is often used. In addition, a paper cup with a corrugated shape around the entire circumference of the paper cup, or a double structure of the inside and the outside with a space between the two layers, and both sides of the paper are heated. As the plastic synthetic resin layer, there is one in which a material laminated with a polyethylene resin layer is used and the polyethylene resin layer on the surface of the paper cup is foamed.
【０００３】しかし、前述の断熱性カップにおいて、発
泡ポリスチレン樹脂によるカップは、発泡剤を加えた樹
脂を成形加工することによって製造され、断熱性では優
れているが、使用後、廃棄物として処理しにくく、環境
対応の点で問題がある。また、表面の平滑性が低く、印
刷適性に劣るなどの欠点もある。However, in the above-mentioned heat insulating cup, a cup made of expanded polystyrene resin is manufactured by molding a resin containing a foaming agent, and although it has excellent heat insulating property, it is treated as waste after use. It is difficult and there is a problem in terms of environmental compatibility. Further, there are drawbacks such as low surface smoothness and poor printability.
【０００４】また、全周に波形状などの紙製の胴巻きを
した形の紙カップは、断熱性、および環境対応の点では
優れているが、製造上、胴巻き部を波形状にし、本体に
巻き付ける工程が必要で、技術的難しさがあり、コスト
高になっている。A paper cup having a corrugated paper roll around the entire circumference is excellent in terms of heat insulation and environmental friendliness, but in manufacturing, the body roll is corrugated and wound around the main body. It requires a process, is technically difficult, and is expensive.
【０００５】また、内側カップと外側カップの二重構造
をもつカップは、平滑性の良い材料を外側のカップに使
い、印刷適性が良いなどの特徴はあるが、材料、および
製造上のコストが高い。Further, a cup having a double structure of an inner cup and an outer cup uses a material having good smoothness for the outer cup, and has characteristics such as good printability, but the material and the manufacturing cost are low. high.
【０００６】これらの断熱性カップに対して、断熱性が
あり、印刷適性があり、使用後は廃棄物として捨てやす
く、そして製造工程が簡単でコストが安いという特徴を
もったものが、表面のポリエチレン樹脂層を発泡させた
紙カップであり、一般に実用化されている。この断熱紙
カップは、特公昭４８−３２２８３号公報にある、ポリ
エチレン樹脂加工紙を加熱し、紙の含有水分の蒸気圧に
より、表面のポリエチレン樹脂層を発泡させ、凹凸模様
を製造する方法を応用したものである。特開昭５７−１
１０４３９号公報では、胴部材の片側壁面が熱可塑性合
成樹脂フィルムの発泡層がコーティングまたはラミネー
トされている胴部材および底板部材から成る紙製容器と
して、その紙カップへの応用が開示されている。しか
し、紙カップの胴部材の表面に発泡層が存在すると、表
面に施された印刷が不鮮明になるという問題があり、特
開平７−２３２７７４号公報では、ポリオレフィン系樹
脂層と紙を主体とする基材層との間に、着色インキによ
る印刷層を有する断熱性紙容器として、印刷部分で厚い
発泡した層を持たせ、また、任意の部分に発泡抑制層を
設けて下の印刷層を鮮明にする技術が開示されている。These heat-insulating cups have heat-insulating properties, printability, are easy to dispose of as waste after use, and have a simple manufacturing process and low cost. It is a paper cup made by foaming a polyethylene resin layer and is generally put into practical use. This heat-insulating paper cup is obtained by applying the method disclosed in Japanese Patent Publication No. 48-32283, in which polyethylene resin-treated paper is heated and the polyethylene resin layer on the surface is foamed by the vapor pressure of the water content of the paper to produce an uneven pattern. It is a thing. JP-A-57-1
Japanese Patent No. 10439 discloses an application to a paper cup as a paper container composed of a body member and a bottom plate member in which one side wall surface of the body member is coated or laminated with a foam layer of a thermoplastic synthetic resin film. However, when a foam layer is present on the surface of the body member of the paper cup, there is a problem that the printing applied to the surface becomes unclear. In JP-A-7-232774, there is a problem that a base material mainly composed of a polyolefin resin layer and paper is used. As a heat-insulating paper container that has a printed layer of colored ink between it and the material layer, it has a thick foamed layer at the printed part, and a foam suppression layer is provided at any part to make the lower printed layer clear. Techniques for doing so are disclosed.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、これま
での方法では、紙カップの胴部材の表面に発泡した層が
あるため、下層の印刷層が鮮明に見ることができないと
いう問題があり、そこで、特開平７−２７２０２３号公
報に開示しているように、発泡する層の表面に非抑制印
刷層を施すことにより、印刷は鮮明に見ることができる
が、実際には表面印刷層部分が完全非印刷とはならず
に、若干発泡抑制気味となり、特に、重ね印刷部分で
は、抑制する度合いが強くなる傾向があり、十分な断熱
性が得ることができないという問題がある。However, in the conventional methods, there is a problem that the lower printing layer cannot be clearly seen because of the foamed layer on the surface of the body member of the paper cup. As disclosed in Kaihei 7-272023, by providing a non-suppressing printing layer on the surface of the foaming layer, the printing can be clearly seen, but in reality, the surface printing layer portion is completely unprinted. However, the foaming tends to be suppressed a little, and the degree of suppression tends to be strong particularly in the overprinted portion, and there is a problem that sufficient heat insulation cannot be obtained.
【０００８】本発明は、紙カップの表面に施された印刷
の鮮明さを損なうことのない発泡した層を有し、断熱効
果が十分ある断熱紙カップを提供することを目的とする
ものである。It is an object of the present invention to provide a heat insulating paper cup having a foamed layer which does not impair the sharpness of printing applied to the surface of the paper cup and has a sufficient heat insulating effect.
【０００９】[0009]
【課題を解決するための手段】本発明は、上記のような
課題を解決すべく検討した結果、胴部材と底部材からな
り、前記胴部材の材料構成が少なくとも外面から、熱可
塑性合成樹脂層（表面）、紙の基材層、熱可塑性合成樹
脂層（裏面）からなる紙カップにおいて、熱可塑性合成
樹脂層（裏面）が発泡していることを特徴とする断熱紙
カップである。そして、前記熱可塑性合成樹脂層（表
面）および前記熱可塑性合成樹脂層（裏面）がポリオレ
フィン系樹脂であることを特徴とする。DISCLOSURE OF THE INVENTION As a result of studies to solve the above problems, the present invention comprises a body member and a bottom member, and the material composition of the body member is at least from the outer surface to a thermoplastic synthetic resin layer. A paper cup comprising a (front surface), a paper base layer, and a thermoplastic synthetic resin layer (back surface), wherein the thermoplastic synthetic resin layer (back surface) is foamed. The thermoplastic synthetic resin layer (front surface) and the thermoplastic synthetic resin layer (back surface) are polyolefin-based resins.
【００１０】また、前記熱可塑性合成樹脂層（裏面）
が、共押し出しによる多層構成であることを特徴とし、
その多層構成である前記熱可塑性合成樹脂層（裏面）の
最内層の熱可塑性合成樹脂層の熱可塑性合成樹脂の融点
が、前記熱可塑性合成樹脂層（裏面）の前記基材層側の
熱可塑性合成樹脂層の熱可塑性合成樹脂の融点より高い
ことを特徴とする。The thermoplastic synthetic resin layer (back surface)
Is characterized by a multi-layer structure by co-extrusion,
The melting point of the thermoplastic synthetic resin of the thermoplastic synthetic resin layer of the innermost layer of the thermoplastic synthetic resin layer (rear surface) having the multilayer structure is the thermoplasticity of the base material layer side of the thermoplastic synthetic resin layer (rear surface). It is characterized by being higher than the melting point of the thermoplastic synthetic resin of the synthetic resin layer.
【００１１】さらに、前記基材層又は前記熱可塑性合成
樹脂層（表面）の表面に印刷を施していることを特徴と
する。Further, the surface of the base material layer or the thermoplastic synthetic resin layer (surface) is printed.
【００１２】本発明によれば、少なくとも外面から、熱
可塑性合成樹脂層（表面）、基材層、熱可塑性合成樹脂
層（裏面）からなる紙カップにおいて、裏面側の熱可塑
性合成樹脂層（裏面）を発泡した層にすることにより、
紙カップの表面に施された印刷の鮮明さを損なうことの
ない発泡した層を有し、断熱効果が充分ある断熱紙カッ
プを得ることができる。According to the present invention, in a paper cup comprising a thermoplastic synthetic resin layer (front surface), a base material layer, and a thermoplastic synthetic resin layer (back surface) from at least the outer surface, a thermoplastic synthetic resin layer (back surface) on the back surface side is formed. By making the foamed layer,
It is possible to obtain a heat-insulating paper cup that has a foamed layer that does not impair the sharpness of printing applied to the surface of the paper cup and has a sufficient heat insulating effect.
【００１３】[0013]
【発明の実施の形態】以下に、図面を参照しながら、本
発明について、さらに詳しく説明する。本発明による断
熱紙カップは、図１に示すような、胴部材１と底部材２
とから構成された、熱可塑性合成樹脂層（裏面）が発泡
する前の状態の紙カップＰを発泡させることにより形成
されるものである。胴部材１、あるいは底部材２の材料
構成は、図２−ａ、ｂに示すように、紙を基材層３とし
て、その基材層３の表面側には印刷層４がある。さら
に、これらの層は熱可塑性合成樹脂層（表面）５によっ
て、被覆されている。裏面側には熱可塑性合成樹脂層
（裏面）６がある。また、図２−ｃに示すように、基材
層３の紙と熱可塑性合成樹脂層（表面）５との間には、
バリア性などを上げるためにアルミニウム箔層などを設
けることもできる。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to the drawings. The heat insulating paper cup according to the present invention includes a body member 1 and a bottom member 2 as shown in FIG.
It is formed by foaming the paper cup P in a state before the thermoplastic synthetic resin layer (back surface) is foamed. As for the material constitution of the body member 1 or the bottom member 2, as shown in FIGS. 2A and 2B, paper is used as the base material layer 3, and the printing layer 4 is provided on the front surface side of the base material layer 3. Further, these layers are covered with a thermoplastic synthetic resin layer (surface) 5. On the back surface side, there is a thermoplastic synthetic resin layer (back surface) 6. Further, as shown in FIG. 2C, between the paper of the base material layer 3 and the thermoplastic synthetic resin layer (surface) 5,
An aluminum foil layer or the like may be provided to improve the barrier property.
【００１４】基材層３は紙であり、その坪量は１００〜
４００ｇ／ｍ2 の範囲が紙カップの製造上好ましい。ま
た、この紙の含水率が重要で、３〜１０％の範囲が好ま
しい。できれば、５〜８％の範囲で安定させることがよ
り好ましい。紙の中の水分を蒸発させ、その蒸気圧の力
で表面の熱可塑性合成樹脂層を発泡させるというのが原
理となっている。The base material layer 3 is paper, and the basis weight thereof is 100-.
The range of 400 g / m 2 is preferable for the production of paper cups. Further, the water content of this paper is important, and the range of 3 to 10% is preferable. If possible, it is more preferable to stabilize in the range of 5 to 8%. The principle is to evaporate the water in the paper and foam the thermoplastic synthetic resin layer on the surface by the force of the vapor pressure.
【００１５】印刷層４は、必ずしも必要としないが、基
材層３の紙の表面、あるいは熱可塑性合成樹脂層（表
面）５の上に施される。この印刷層４は、図２−ａに示
すように、部分的に着色インキで印刷される場合と、図
２−ｄに示すように、全面的に着色インキで印刷される
場合とがある。印刷の位置、印刷面積の大小、印刷の方
法、使用されるインキなどは、従来公知の技術を適宜選
択して用いることができる。The printing layer 4 is not necessarily required, but is applied on the paper surface of the base material layer 3 or on the thermoplastic synthetic resin layer (surface) 5. The printed layer 4 may be partially printed with colored ink as shown in FIG. 2-a or may be printed entirely with colored ink as shown in FIG. 2-d. A conventionally known technique can be appropriately selected and used for the printing position, the size of the printing area, the printing method, the ink used, and the like.
【００１６】本発明の熱可塑性合成樹脂層（表面）５お
よび熱可塑性合成樹脂層（裏面）６に使用する熱可塑性
合成樹脂は、ポリエチレン樹脂、ポリプロピレン樹脂、
ポリエステル樹脂、ポリスチレン樹脂などのポリオレフ
ィン系樹脂を使用する。この熱可塑性合成樹脂層（表
面）５は、基材層３の表側に、熱可塑性合成樹脂層（裏
面）６は、基材層３の裏側に積層される。The thermoplastic synthetic resin used in the thermoplastic synthetic resin layer (front surface) 5 and the thermoplastic synthetic resin layer (rear surface) 6 of the present invention includes polyethylene resin, polypropylene resin,
Polyolefin resin such as polyester resin and polystyrene resin is used. The thermoplastic synthetic resin layer (front surface) 5 is laminated on the front side of the base material layer 3, and the thermoplastic synthetic resin layer (back surface) 6 is laminated on the back side of the base material layer 3.
【００１７】積層する方法には、樹脂を熱溶融して塗布
する押し出しコーティング法、あるいはフィルムになっ
たものを貼り合わせるラミネート法などがある。As a method for laminating, there is an extrusion coating method in which a resin is heat-melted and applied, or a laminating method in which film-like materials are laminated.
【００１８】発泡した層となる裏面の熱可塑性合成樹脂
層（裏面）６の発泡する前の厚さは、１５〜５０μの範
囲が好ましい。厚すぎても、薄すぎても発泡しにくくな
る。また、熱可塑性合成樹脂層（裏面）６は、図２−ｅ
に示すように、多層とすることもでき、その場合には、
共押し出しコーティング法で積層することができる。The thickness of the thermoplastic synthetic resin layer (back surface) 6 on the back surface, which is a foamed layer, before foaming is preferably in the range of 15 to 50 μm. If it is too thick or too thin, it will be difficult to foam. Further, the thermoplastic synthetic resin layer (back surface) 6 is shown in FIG.
It can also be multi-layered, as shown in
It can be laminated by a coextrusion coating method.
【００１９】一方、表面の熱可塑性合成樹脂層（表面）
５の厚さは、特に限定されない。ただ、表面を発泡させ
ずに、裏面だけを発泡させるために、表面からの水蒸気
の蒸発を防ぐ方法は、紙と熱可塑性合成樹脂層（表面）
５の間にアルミニウム箔などの層を設けるか、あるいは
表面の熱可塑性合成樹脂層（表面）５の熱可塑性合成樹
脂は裏面の熱可塑性合成樹脂層（裏面）６の熱可塑性合
成樹脂より融点の高い熱可塑性合成樹脂を使うことであ
る。例えば、ポリエチレン樹脂の場合、融点の高い高密
度ポリエチレン樹脂を表面の熱可塑性合成樹脂層（表
面）５の熱可塑性合成樹脂として用いることである。On the other hand, the thermoplastic synthetic resin layer on the surface (surface)
The thickness of 5 is not particularly limited. However, the method to prevent the evaporation of water vapor from the surface is to foam only the back surface without foaming the surface, and paper and thermoplastic synthetic resin layer (surface)
A layer such as an aluminum foil is provided between 5 or the thermoplastic synthetic resin on the front surface of the thermoplastic synthetic resin layer (front surface) 5 has a higher melting point than that of the thermoplastic synthetic resin layer on the back surface (back surface) 6. It is to use high thermoplastic synthetic resin. For example, in the case of polyethylene resin, a high-density polyethylene resin having a high melting point is used as the thermoplastic synthetic resin of the surface thermoplastic synthetic resin layer (surface) 5.
【００２０】なお、熱可塑性合成樹脂層（裏面）６を多
層とした場合には、その最内層の熱可塑性合成樹脂層
（裏面）６ａの熱可塑性合成樹脂は、基材層３側の熱可
塑性合成樹脂層（裏面）６ｂの熱可塑性合成樹脂の融点
より高いものとする。最内層の熱可塑性合成樹脂層（裏
面）６ａの熱可塑性合成樹脂を、基材層３側の熱可塑性
合成樹脂層（裏面）６ｂの熱可塑性合成樹脂よりも融点
の高い熱可塑性合成樹脂とすることによって、基材層３
側の熱可塑性合成樹脂層（裏面）６ｂが発泡しても、最
内層の熱可塑性合成樹脂層（裏面）６ａは発泡せず、発
泡した層が過発泡により破けてピンホールが発生するこ
とがない。When the thermoplastic synthetic resin layer (back surface) 6 is a multi-layer, the thermoplastic synthetic resin of the innermost thermoplastic synthetic resin layer (back surface) 6a is the thermoplastic resin of the base material layer 3 side. It is higher than the melting point of the thermoplastic synthetic resin of the synthetic resin layer (back surface) 6b. The thermoplastic synthetic resin of the innermost thermoplastic synthetic resin layer (back surface) 6a is a thermoplastic synthetic resin having a higher melting point than the thermoplastic synthetic resin of the thermoplastic synthetic resin layer (back surface) 6b of the base material layer 3 side. By this, the base material layer 3
Even if the side thermoplastic synthetic resin layer (back surface) 6b foams, the innermost thermoplastic synthetic resin layer (back surface) 6a does not foam, and the foamed layer may break due to over-foaming and pinholes may be generated. Absent.
【００２１】つぎに、本発明の断熱紙カップＡの製造方
法は、基材層３の表面に熱可塑性合成樹脂層（表面）５
を、裏面に熱可塑性合成樹脂層（裏面）６を積層した積
層体を、打ち抜きで紙カップの胴部材１の形状の胴部材
ブランクに加工し、底部材２と合わせて、紙カップに成
形する。底部材２にも、発泡する熱可塑性合成樹脂層を
もった積層体を使うことができる。この紙カップは、一
般的な紙カップ成型機で製造ができる。この成型された
発泡する前の紙カップを加熱することにより、紙の中の
水分が蒸発し、その蒸気圧と空気の熱膨張とが加わって
作用し、裏面の熱可塑性合成樹脂層（裏面）６に発泡構
造を生成させる。Next, in the method for manufacturing the heat insulating paper cup A of the present invention, the thermoplastic synthetic resin layer (surface) 5 is formed on the surface of the base material layer 3.
Then, the laminated body in which the thermoplastic synthetic resin layer (rear surface) 6 is laminated on the back surface is punched into a body member blank in the shape of the body member 1 of the paper cup, and together with the bottom member 2, is formed into a paper cup. The bottom member 2 may also be a laminated body having a foamable thermoplastic synthetic resin layer. This paper cup can be manufactured by a general paper cup molding machine. By heating the molded paper cup before foaming, the water content in the paper evaporates, and the vapor pressure and the thermal expansion of air act together to act, and the thermoplastic synthetic resin layer (back surface) 6 on the back surface To produce a foamed structure.
【００２２】加熱方法としては、熱風、赤外線、遠赤外
線、マイクロ波、高周波などを使うことができる。静置
して加熱する方法、あるいはコンベアーにより送りなが
ら加熱する方法がある。加熱条件としては、温度が１０
０〜２００°Ｃの範囲が好ましく、時間としては、１０
秒〜５分の範囲が好ましい。As a heating method, hot air, infrared rays, far infrared rays, microwaves, high frequencies, etc. can be used. There is a method of standing and heating, or a method of heating while feeding by a conveyor. As the heating condition, the temperature is 10
The range of 0 to 200 ° C is preferable, and the time is 10
The range of seconds to 5 minutes is preferred.
【００２３】本発明の断熱紙カップの用途としては、コ
ーヒー、紅茶、スープなどの熱い飲料用の容器、あるい
はインスタントラーメンなどの温める即席食品用の容器
がある。Applications of the heat-insulating paper cup of the present invention include containers for hot beverages such as coffee, tea and soup, and containers for warm instant food such as instant noodles.
【００２４】[0024]
【実施例】つぎに、本発明について実施例をあげて、さ
らに具体的に説明する。EXAMPLES Next, the present invention will be described more specifically with reference to Examples.
【００２５】〔実施例１〕まず、基材層３の紙として、
坪量３００ｇ／ｍ2 、含水率８．０％のカップ原紙の表
面に部分的に絵柄をグラビア印刷で印刷して印刷層４を
設け、つぎに、その上にタンデム押し出しラミネーター
で表面側には、熱可塑性合成樹脂層（表面）５として中
密度ポリエチレン（密度ｄ：０．９３５、ＭＩ：９．
５）を厚さ２０μｍで押し出しコーティングし、裏面側
には、熱可塑性合成樹脂層（裏面）６として低密度ポリ
エチレン（密度ｄ：０．９１７、ＭＩ：７．０）を厚さ
４０μｍで押し出しコーティングすることによって、層
構成が表面側から中密度ポリエチレン２０μｍ／グラビ
ア印刷層／ カップ原紙３００ｇ／ｍ2／低密度ポリエ
チレン４０μｍとなる積層体を作製した。つづいて、こ
の積層体を胴部材ブランクに打ち抜き、紙カップ成形機
によって発泡する前の紙カップを作成した。さらにこの
紙カップを、１２０°Ｃの乾燥機の中で３分間加熱し、
図３に示すように、裏面の熱可塑性合成樹脂層（裏面）
６である低密度ポリエチレン層が発泡した断熱紙カップ
Ａを得た。Example 1 First, as the paper of the base material layer 3,
A pattern is partially printed by gravure printing on the surface of a cup base paper having a basis weight of 300 g / m 2 and a water content of 8.0% to form a print layer 4, and then a tandem extrusion laminator is provided on the surface of the cup. , A medium density polyethylene (density d: 0.935, MI: 9.
5) is extrusion-coated with a thickness of 20 μm, and low-density polyethylene (density d: 0.917, MI: 7.0) is extrusion-coated with a thickness of 40 μm as a thermoplastic synthetic resin layer (back side) 6 on the back side. By doing so, a laminate having a layer structure of 20 μm for medium density polyethylene / gravure printing layer / 300 g / m 2 of base paper for cup / 40 μm for low density polyethylene was prepared. Subsequently, this laminated body was punched out into a body member blank to prepare a paper cup before foaming with a paper cup molding machine. Then heat the paper cup in a dryer at 120 ° C for 3 minutes,
As shown in FIG. 3, the thermoplastic synthetic resin layer on the back surface (back surface)
A heat insulating paper cup A having a low density polyethylene layer of 6 was obtained.
【００２６】〔実施例２〕まず、基材層３の紙として、
坪量３００ｇ／ｍ2 、含水率８．０％のカップ原紙の表
面に部分的に絵柄をグラビア印刷で印刷して印刷層４を
設け、つぎに、その上にタンデム押し出しラミネーター
で表面側には、熱可塑性合成樹脂層（表面）５として中
密度ポリエチレン（密度ｄ：０．９３５、ＭＩ：９．
５）を厚さ２０μｍで押し出しコーティングし、裏面側
には、熱可塑性合成樹脂層（裏面）６として、基材層３
側の熱可塑性合成樹脂層６ｂに厚さ３５μｍの低密度ポ
リエチレン（密度ｄ：０．９１７、ＭＩ：７．０）と最
内層の熱可塑性合成樹脂層６ａに厚さ５μｍの中密度ポ
リエチレン（密度ｄ：０．９３５、ＭＩ：９．５）を共
押し出し法により押し出しコーティングし、層構成が表
面側から中密度ポリエチレン２０μｍ／グラビア印刷層
／ カップ原紙３００ｇ／ｍ2／低密度ポリエチレン３
５μｍ／中密度ポリエチレン５μｍ（２層共押し出し）
となる積層体を作製した。つづいて、この積層体を胴部
材ブランクに打ち抜き、紙カップ成形機によって発泡す
る前の紙カップを作成した。さらにこの紙カップを、１
２０°Ｃの乾燥機の中で３分間加熱し、図４に示すよう
に、裏面の熱可塑性合成樹脂層（裏面）６の基材層３側
の熱可塑性合成樹脂層６ｂの低密度ポリエチレン層が発
泡した断熱紙カップＢを得た。Example 2 First, as the paper of the base material layer 3,
A pattern is partially printed by gravure printing on the surface of a cup base paper having a basis weight of 300 g / m 2 and a water content of 8.0% to form a print layer 4, and then a tandem extrusion laminator is provided on the surface of the cup. , A medium density polyethylene (density d: 0.935, MI: 9.
5) is extrusion-coated with a thickness of 20 μm, and a thermoplastic resin layer (back surface) 6 is formed on the back surface side as a base material layer 3
35 μm thick low-density polyethylene (density d: 0.917, MI: 7.0) in the thermoplastic synthetic resin layer 6 b on the side and medium-density polyethylene (density of 5 μm in the innermost thermoplastic synthetic resin layer 6 a (d: 0.935, MI: 9.5) is extrusion-coated by a co-extrusion method, and the layer constitution is from the surface side to medium density polyethylene 20 μm / gravure printing layer / cup base paper 300 g / m 2 / low density polyethylene 3
5 μm / medium density polyethylene 5 μm (two-layer coextrusion)
A laminate having the following structure was produced. Subsequently, this laminated body was punched out into a body member blank to prepare a paper cup before foaming with a paper cup molding machine. Furthermore, this paper cup 1
After heating for 3 minutes in a dryer at 20 ° C., as shown in FIG. 4, a low-density polyethylene layer of the thermoplastic synthetic resin layer 6b on the base material layer 3 side of the thermoplastic synthetic resin layer (back surface) 6 on the rear surface. A heat-insulating paper cup B having foamed was obtained.
【００２７】〔比較例〕まず、基材層３の紙として、坪
量３００ｇ／ｍ2 、含水率８．０％のカップ原紙の表面
に部分的に絵柄をグラビア印刷で印刷して印刷層４を設
け、つぎに、その上にタンデム押し出しラミネーターで
表面側には、熱可塑性合成樹脂層（表面）５として低密
度ポリエチレン（密度ｄ：０．９１７、ＭＩ：７．０）
を厚さ４０μｍで押し出しコーティングし、裏面側に
は、熱可塑性合成樹脂層（裏面）６として中密度ポリエ
チレン（密度ｄ：０．９３５、ＭＩ：９．５）を厚さ２
０μｍで押し出しコーティングすることによって、層構
成が表面側から低密度ポリエチレン４０μｍ／グラビア
印刷層／ カップ原紙３００ｇ／ｍ2／中密度ポリエチ
レン２０μｍとなる積層体を作製した。つづいて、この
積層体を胴部材ブランクに打ち抜き、紙カップ成形機に
よって発泡する前の紙カップを作成した。さらにこの紙
カップを、１２０°Ｃの乾燥機の中で３分間加熱し、図
５に示すように、表面の熱可塑性合成樹脂層（表面）６
である低密度ポリエチレン層が発泡した断熱紙カップＣ
を得た。Comparative Example First, as the paper for the base material layer 3, a pattern was partially printed by gravure printing on the surface of a cup base paper having a basis weight of 300 g / m 2 and a water content of 8.0% to form a printing layer 4. Next, a low density polyethylene (density d: 0.917, MI: 7.0) is provided as a thermoplastic synthetic resin layer (surface) 5 on the surface side with a tandem extrusion laminator.
Is extrusion-coated with a thickness of 40 μm, and a medium-density polyethylene (density d: 0.935, MI: 9.5) is formed as a thermoplastic synthetic resin layer (back surface) 6 on the back surface side with a thickness of 2
By extrusion coating at 0 μm, a laminate having a layer structure of 40 μm of low-density polyethylene / gravure printing layer / 300 g / m 2 of cup base paper / 20 μm of medium-density polyethylene was prepared from the surface side. Subsequently, this laminated body was punched out into a body member blank to prepare a paper cup before foaming with a paper cup molding machine. Further, this paper cup was heated in a dryer at 120 ° C. for 3 minutes, and as shown in FIG. 5, the thermoplastic synthetic resin layer (surface) 6 on the surface
Insulation paper cup C with low density polyethylene layer foamed
Got
【００２８】上記の実施例および比較例の断熱紙カップ
について、表面印刷の状態および断熱性を比較した。断
熱性については、内容物として、９０°Ｃの湯を入れて
３分後の表面温度を測定した。その結果、表１に示すよ
うに、外観上では、比較例が印刷層４の上になる熱可塑
性合成樹脂層（表面）５があるため印刷がぼやけてしま
うのに対して、本発明の実施例では、印刷層４の上にな
る熱可塑性合成樹脂層（表面）５層が発泡していないた
め、印刷が鮮明に視認することができた。また、断熱性
の点では、比較例の表面に発泡した層を設けた場合と同
様の効果が見られた。また、実施例２においては、裏面
側の熱可塑性合成樹脂層（裏面）６を２層にして、最内
層の熱可塑性合成樹脂層６ａを発泡するのではなく、基
材層側の熱可塑性合成樹脂層６ｂを発泡しているため、
最内面に平滑性があり、ピンホールの発生の危険がなか
った。The heat-insulating paper cups of the above Examples and Comparative Examples were compared in terms of surface printing and heat insulation. Regarding the heat insulating property, 90 ° C. hot water was put in as a content, and the surface temperature after 3 minutes was measured. As a result, as shown in Table 1, in comparison with the appearance, the comparative example has the thermoplastic synthetic resin layer (surface) 5 on the printed layer 4, which causes the printing to be blurred, while the embodiment of the present invention In the example, since the thermoplastic synthetic resin layer (surface) 5 layer on the print layer 4 was not foamed, the print was clearly visible. In terms of heat insulation, the same effect as when the foamed layer was provided on the surface of the comparative example was observed. Further, in Example 2, the thermoplastic synthetic resin layer (back surface) 6 on the back surface side is made into two layers, and the thermoplastic synthetic resin layer 6a of the innermost layer is not foamed, but the thermoplastic synthetic resin layer on the base material layer side is used. Since the resin layer 6b is foamed,
The innermost surface was smooth and there was no danger of pinholes.
【００２９】[0029]
【表１】 [Table 1]
【００３０】[0030]
【発明の効果】本発明によれば、胴部材と底部材とから
なり、胴部材の材料構成が少なくとも外面から、熱可塑
性合成樹脂層（表面）、基材層、熱可塑性合成樹脂層
（裏面）からなる紙カップにおいて、裏面側の熱可塑性
合成樹脂層（裏面）を発泡した層にすることにより、紙
カップの表面に施された印刷の鮮明さを損なうことのな
い、断熱効果が充分ある断熱紙カップを得ることができ
る。また、熱可塑性合成樹脂層（裏面）を多層とし、基
材層側の熱可塑性合成樹脂層を発泡させることにより、
熱可塑性合成樹脂層（裏面）にピンホールの発生がない
という効果を有するものである。According to the present invention, a body member and a bottom member are provided, and the material composition of the body member is at least from the outer surface to a thermoplastic synthetic resin layer (front surface), a base material layer, and a thermoplastic synthetic resin layer (back surface). In the paper cup made of), the thermoplastic synthetic resin layer (back surface) on the back surface side is made to be a foamed layer, and the heat insulation paper cup having a sufficient heat insulating effect without impairing the sharpness of the printing performed on the surface of the paper cup. Can be obtained. In addition, by forming the thermoplastic synthetic resin layer (back surface) into multiple layers and foaming the thermoplastic synthetic resin layer on the base material layer side,
It has an effect that no pinhole is generated in the thermoplastic synthetic resin layer (back surface).
【図１】本発明による断熱紙カップの発泡前の一実施例
を示す一部を切欠断面とした概略断面図である。FIG. 1 is a schematic cross-sectional view showing a partially cutaway cross-section of an embodiment of an insulating paper cup according to the present invention before foaming.
【図２】本発明による断熱紙カップの発泡前の一実施例
を示す部分拡大断面図である。FIG. 2 is a partially enlarged sectional view showing an embodiment of the heat insulating paper cup according to the present invention before foaming.
【図３】本発明による断熱紙カップの一実施例を示す部
分切り欠け断面図である。FIG. 3 is a partially cutaway sectional view showing an embodiment of the heat insulating paper cup according to the present invention.
【図４】本発明による断熱紙カップの他の実施例を示す
部分切り欠け断面図である。FIG. 4 is a partially cutaway sectional view showing another embodiment of the heat insulating paper cup according to the present invention.
【図５】比較例として従来の断熱紙カップの一例を示す
部分切り欠け断面図である。FIG. 5 is a partially cutaway sectional view showing an example of a conventional heat insulating paper cup as a comparative example.
Ａ 断熱紙カップ（実施例１） Ｂ 断熱紙カップ（実施例２） Ｃ 断熱紙カップ（比較例） Ｐ 発泡する前の断熱紙カップ １ 胴部材 ２ 底部材 ３ 基材層 ４ 印刷層 ５ 熱可塑性合成樹脂層（表面） ６ 熱可塑性合成樹脂層（裏面） ６ａ 熱可塑性合成樹脂層（裏面）の最内層 ６ｂ 熱可塑性合成樹脂層（裏面）の基材層側の層 ７ バリアー層 A Adiabatic paper cup (Example 1) B Insulating paper cup (Example 2) C Insulating paper cup (comparative example) P Insulating paper cup before foaming 1 body member 2 Bottom member 3 Base material layer 4 printing layers 5 Thermoplastic synthetic resin layer (surface) 6 Thermoplastic synthetic resin layer (back side) 6a Innermost layer of thermoplastic synthetic resin layer (back side) 6b Layer on the base material layer side of the thermoplastic synthetic resin layer (back surface) 7 Barrier layer
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 3E067 AA03 AB26 BA07A BB14A BB17A BB25A CA18 EE02 FA01 FC03 GA11 GD05 4F100 AK01A AK01C AK03A AK03C AK06 BA03 BA04 BA07 DG10B DJ01C EH20C GB16 HB31A JA04 JB16A JB16C JJ02 ─────────────────────────────────────────────────── ─── Continued front page F-term (reference) 3E067 AA03 AB26 BA07A BB14A BB17A BB25A CA18 EE02 FA01 FC03 GA11 GD05 4F100 AK01A AK01C AK03A AK03C AK06 BA03 BA04 BA07 DG10B DJ01C EH20C GB16 HB31A JA04 JB16A JB16C JJ02
Claims (5)
材料構成が少なくとも外面から、熱可塑性合成樹脂層
（表面）、紙の基材層、熱可塑性合成樹脂層（裏面）か
らなる紙カップにおいて、熱可塑性合成樹脂層（裏面）
が発泡していることを特徴とする断熱紙カップ。1. A paper cup comprising a body member and a bottom member, wherein the material composition of the body member comprises at least an outer surface, a thermoplastic synthetic resin layer (front surface), a paper base material layer, and a thermoplastic synthetic resin layer (back surface). At, thermoplastic synthetic resin layer (back side)
An insulating paper cup characterized by being foamed.
前記熱可塑性合成樹脂層（裏面）がポリオレフィン系樹
脂であることを特徴とする請求項１に記載する断熱紙カ
ップ。2. The heat-insulating paper cup according to claim 1, wherein the thermoplastic synthetic resin layer (front surface) and the thermoplastic synthetic resin layer (back surface) are made of a polyolefin resin.
押し出しによる多層構成であることを特徴とする請求項
２に記載する断熱紙カップ。3. The heat insulating paper cup according to claim 2, wherein the thermoplastic synthetic resin layer (back surface) has a multi-layered structure formed by coextrusion.
（裏面）の最内層の熱可塑性合成樹脂層の熱可塑性合成
樹脂の融点が、前記熱可塑性合成樹脂層（裏面）の前記
基材層側の熱可塑性合成樹脂層の熱可塑性合成樹脂の融
点より高いことを特徴とする請求項３に記載する断熱紙
カップ。4. The base material layer of the thermoplastic synthetic resin layer (back surface) having a melting point of the thermoplastic synthetic resin of the innermost thermoplastic synthetic resin layer of the thermoplastic synthetic resin layer (back surface) having a multilayer structure. The heat-insulating paper cup according to claim 3, which has a melting point higher than that of the thermoplastic synthetic resin of the thermoplastic synthetic resin layer on the side.
（表面）の表面に印刷を施していることを特徴とする請
求項１乃至４のいずれかに記載する断熱紙カップ。5. The heat insulating paper cup according to claim 1, wherein the surface of the base material layer or the thermoplastic synthetic resin layer (surface) is printed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002043827A JP2003237855A (en) | 2002-02-20 | 2002-02-20 | Heat-insulating paper cup |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002043827A JP2003237855A (en) | 2002-02-20 | 2002-02-20 | Heat-insulating paper cup |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003237855A true JP2003237855A (en) | 2003-08-27 |
Family
ID=27783462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002043827A Pending JP2003237855A (en) | 2002-02-20 | 2002-02-20 | Heat-insulating paper cup |
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| Country | Link |
|---|---|
| JP (1) | JP2003237855A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009126560A (en) * | 2007-11-27 | 2009-06-11 | Toppan Printing Co Ltd | Heat-insulating foamed paper cup |
| JP2009132400A (en) * | 2007-11-29 | 2009-06-18 | Toppan Printing Co Ltd | Heat insulating foamed paper cup |
| JP2009297982A (en) * | 2008-06-12 | 2009-12-24 | Tosoh Corp | Laminate for thermal foaming |
| KR100966159B1 (en) | 2008-10-21 | 2010-06-25 | 김창수 | The manufacturing method of Insulated paper vessel |
| JP2014113774A (en) * | 2012-12-11 | 2014-06-26 | Act:Kk | Multilayer sheet for heat-insulation paper container, heat-insulation paper container, and production method |
| JP2014227220A (en) * | 2013-05-27 | 2014-12-08 | 大日本印刷株式会社 | Paper cup |
| JP2016108039A (en) * | 2014-12-10 | 2016-06-20 | 東罐興業株式会社 | Heat insulation paper container |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0542929A (en) * | 1991-08-05 | 1993-02-23 | Nippon Dekishii:Kk | Container and production thereof |
| JPH0550536A (en) * | 1991-08-26 | 1993-03-02 | Honshu Paper Co Ltd | Manufacture of paper container having heat insulation property |
| JPH11171160A (en) * | 1997-12-16 | 1999-06-29 | Toppan Printing Co Ltd | Heat-insulating cup |
-
2002
- 2002-02-20 JP JP2002043827A patent/JP2003237855A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0542929A (en) * | 1991-08-05 | 1993-02-23 | Nippon Dekishii:Kk | Container and production thereof |
| JPH0550536A (en) * | 1991-08-26 | 1993-03-02 | Honshu Paper Co Ltd | Manufacture of paper container having heat insulation property |
| JPH11171160A (en) * | 1997-12-16 | 1999-06-29 | Toppan Printing Co Ltd | Heat-insulating cup |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009126560A (en) * | 2007-11-27 | 2009-06-11 | Toppan Printing Co Ltd | Heat-insulating foamed paper cup |
| JP2009132400A (en) * | 2007-11-29 | 2009-06-18 | Toppan Printing Co Ltd | Heat insulating foamed paper cup |
| JP2009297982A (en) * | 2008-06-12 | 2009-12-24 | Tosoh Corp | Laminate for thermal foaming |
| KR100966159B1 (en) | 2008-10-21 | 2010-06-25 | 김창수 | The manufacturing method of Insulated paper vessel |
| JP2014113774A (en) * | 2012-12-11 | 2014-06-26 | Act:Kk | Multilayer sheet for heat-insulation paper container, heat-insulation paper container, and production method |
| JP2014227220A (en) * | 2013-05-27 | 2014-12-08 | 大日本印刷株式会社 | Paper cup |
| JP2016108039A (en) * | 2014-12-10 | 2016-06-20 | 東罐興業株式会社 | Heat insulation paper container |
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