JP2005076133A

JP2005076133A - Converted paper, paper material for packaging food, food-packaging container and packaged food

Info

Publication number: JP2005076133A
Application number: JP2003305330A
Authority: JP
Inventors: Masatoshi Ishibashi; 正敏石橋; Mikihiko Tanaka; 幹彦田中; Seiichiro Kawana; 清一郎川名; Keizo Sako; 恵蔵佐光
Original assignee: Sekisui Plastics Co Ltd; Crown Package Co Ltd
Current assignee: Sekisui Kasei Co Ltd; Crown Package Co Ltd
Priority date: 2003-08-28
Filing date: 2003-08-28
Publication date: 2005-03-24
Anticipated expiration: 2023-08-28
Also published as: JP4185833B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide converted paper suitable for packaging a largely water-containing food to be heated, to provide a paper material which has a corrugated board structure using the converted paper and is used for packaging foods, to provide a food-packaging container prepared from the paper material for packaging the foods, and to provide a packaged food. <P>SOLUTION: This converted paper 1 is characterized by disposing an acrylic resin heterogeneous coating film layer 3 coated and dried to give an acrylic resin emulsion solid content of 0.9 to 2.7 g/m<SP>2</SP>on one side of base paper 2 and disposing a synthetic resin water-proof layer 4 on the other side of the base paper. The paper material 8 for packaging foods is characterized by having a corrugated board structure having the converted paper fixed by bonding the synthetic resin water-proof layer to at least one side of a corrugated core 5. The food-packaging container is produced from the paper material 8 for packaging the foods. The packaged food is produced by packaging the food with the food-packaging container. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、中華饅頭、蒸しパン等の水分を多く含み、加熱された食品を収容可能な食品容器用として好適な加工紙と食品容器用紙材、該紙材を製函して得られる食品容器及び該食品容器に食品を収納した容器入り食品に関する。 The present invention relates to processed paper and food container paper material suitable for food containers that contain a large amount of water such as Chinese buns, steamed bread, etc. and can contain heated food, and food containers obtained by boxing the paper materials And a food in a container in which food is stored in the food container.

従来、食品容器などとして使用される防水性を有する紙材としては、例えば、ライナの内面に合成樹脂製膜を接着或いは含浸形成すると共に、中芯の段頂に合成樹脂膜の一部を含浸させて両者を接着したことを特徴とする防水段ボールが提案されている（例えば、特許文献１参照。）。
また、穀物の熱水抽出エキスと、アルキルジメチル−ベンザルコニウム−クロライドと、ラウリル−イミノ−ジプロピオン酸と、ポリオキシ−プロピレングリコールとを含有してなる抗菌剤の５乃至１０％水溶液を、アクリル系バインダー樹脂と共に、紙材の表面に塗布したことを特徴とする抗菌加工紙が提案されている（例えば、特許文献２参照。）。
また、表面粗さが最大高さで３０〜５μｍ及びコップ吸水度が５０〜２０ｇ／ｍ^２・２分である製紙用天然繊維を主体とする基紙の片面または両面に、ガラス転移温度が１０〜２８℃のアクリル系樹脂のエマルジョン塗工液を固形分で３〜２０ｇ／ｍ^２塗工し加熱乾燥して得られる、耐ブロッキング性が良好で再生可能な耐水耐油紙が提案されている（例えば、特許文献３参照。）。
特開平７−９５９４号公報特開２００１−２８８６９７号公報特許第３０５５８６７号公報 Conventionally, as a waterproof paper material used as a food container, for example, a synthetic resin film is adhered or impregnated on the inner surface of the liner, and a part of the synthetic resin film is impregnated on the top of the core. A waterproof corrugated cardboard characterized in that the two are bonded together has been proposed (see, for example, Patent Document 1).
Also, a 5 to 10% aqueous solution of an antibacterial agent containing a cereal hot water extract, alkyldimethyl-benzalkonium chloride, lauryl-imino-dipropionic acid, and polyoxy-propylene glycol was added to an acrylic solution. An antibacterial processed paper characterized by being applied to the surface of a paper material together with a binder resin has been proposed (see, for example, Patent Document 2).
Further, the glass transition temperature is 10 on one side or both sides of a base paper mainly composed of natural fibers for paper making having a maximum surface roughness of 30 to 5 μm and a water absorption of 50 to 20 g / m ² · 2 minutes. A reproducible water and oil resistant paper having good blocking resistance and reproducible obtained by applying 3 to ²⁰ g / m ² of an acrylic resin emulsion coating liquid at a solid content of ~ 28 ° C. and drying by heating is proposed ( For example, see Patent Document 3.)
JP-A-7-9594 JP 2001-288697 A Japanese Patent No. 3055867

しかしながら、前記特許文献１に記載された防水段ボールは、表面が紙なので、その表面に蒸した中華饅頭や蒸しパンなどの水分を多く含んだ食品が接すると、食品の表面が段ボール表面に付着してしまうという課題が残されていた。 However, since the surface of the waterproof corrugated cardboard described in Patent Document 1 is paper, when the food containing much moisture such as steamed Chinese bun or steamed bread comes into contact with the surface, the surface of the food adheres to the corrugated cardboard surface. The problem of being left behind was left.

また前記特許文献２に記載された抗菌加工紙は、耐水コート剤を塗工してあるのが表層なので、蒸した中華饅頭や蒸しパンなどの水分を多く含んだ食品を包装すると、表面がビショビショになり、食感が著しく低下してしまう問題がある。
また、耐水コートを施すと、箱を組み立てる際に使用する水溶性接着剤が接着し難くなり、生産性が悪化する問題がある。 Moreover, since the antibacterial paper described in Patent Document 2 is coated with a water-resistant coating agent, the surface of the antibacterial processed paper is soaked when a food containing a lot of water such as steamed Chinese buns or steamed bread is packaged. There is a problem that the texture is remarkably lowered.
Moreover, when a water-resistant coat is applied, there is a problem that the water-soluble adhesive used when assembling the box becomes difficult to adhere and the productivity is deteriorated.

また前記特許文献３に記載された耐水耐油紙は、アクリル系樹脂の均一な塗膜形成を目的にしているので紙の表面粗さに制限があり、紙材の選択の自由度が狭い問題がある。
さらにこの耐水耐油紙は、アクリル系樹脂塗膜が食品と接触する面にあるため、蒸気を発生する食品を包装時、食品から発せられた蒸気が外へ逃げ難く、包装容器内で水滴化し、食品表面がベタベタして食感が低下する問題がある。
またこの耐水耐油紙は、アクリル系樹脂塗膜が完全に紙材表面を覆って形成されているので、箱状の容器を組み立てる際に使用する水溶性接着剤の接着、乾燥が悪く、生産性が悪化し、糊ハガレが多発する問題がある。
さらにこの耐水耐油紙の基紙は、実施例から見ると３２０ｇ／ｍ^２と厚紙を用いているので、重量が嵩み、しかも断熱性に乏しい。
またこの耐水耐油紙は、単なる板紙であり段ボールに比べて保温性は低く、塗膜にムラがありピンホールを生じた場合、その保温性が更に低下してしまう。 In addition, the water-resistant and oil-resistant paper described in Patent Document 3 is intended to form a uniform coating film of an acrylic resin, so there is a limitation on the surface roughness of the paper, and there is a problem that the degree of freedom of selection of the paper material is narrow. is there.
Furthermore, this water-resistant oil-resistant paper has an acrylic resin coating on the surface that comes into contact with food, so when packaging food that generates steam, it is difficult for the steam generated from the food to escape to the outside. There is a problem that the food surface is sticky and the texture is lowered.
This water- and oil-resistant paper is formed with an acrylic resin coating completely covering the surface of the paper material, so the water-soluble adhesive used when assembling the box-like container is poorly bonded and dried, and the productivity However, there is a problem that paste peeling frequently occurs.
In addition, the water- and oil-resistant paper base paper, which is 320 g / m ^{2 in} thickness when viewed from the examples, is heavy and has poor heat insulation.
Further, this water and oil resistant paper is a simple paperboard and has a low heat retention compared to corrugated cardboard. If the coating film is uneven and a pinhole is generated, the heat retention is further lowered.

本発明は前記事情に鑑みてなされたもので、水分を多く含み、熱がかかる食品の包装に適した加工紙、それを用いた段ボール構造を有する食品包装用紙材、この食品包装用紙材を製函した食品包装容器及び容器入り食品の提供を目的とする。 The present invention has been made in view of the above circumstances, and is a processed paper suitable for packaging of food that contains a lot of moisture and is heated, a food packaging paper material having a corrugated cardboard structure using the processed paper, and the production of the food packaging paper material. The purpose is to provide boxed food packaging containers and foods in containers.

前記目的を達成するために本発明は、基紙の一面側にアクリル系樹脂エマルジョンが固形物で０．９〜２．７ｇ／ｍ^２となるように塗工、乾燥されてなるアクリル系樹脂不均一皮膜層が設けられ、前記基紙の他面側に合成樹脂防水層が設けられたことを特徴とする加工紙を提供する。
本発明の加工紙において、前記アクリル系樹脂エマルジョンの塗工量は固形物で１．０〜１．８ｇ／ｍ^２の範囲が好ましい。
また本発明の加工紙において、エンボス加工がなされていることが好ましい。
また本発明は、波形形状をなす中芯の表裏の少なくとも一方に、前記中芯に前記合成樹脂防水層を接着することによって前記加工紙を固定した段ボール構造を有することを特徴とする食品包装用紙材を提供する。
さらに本発明は、前記食品包装用紙材を製函して得られる食品包装容器を提供する。
また本発明は、前記食品包装容器の中に食品を入れて包装してなる容器入り食品を提供する。 In order to achieve the above object, the present invention provides an acrylic resin emulsion prepared by coating and drying an acrylic resin emulsion on one side of a base paper so as to be 0.9 to 2.7 g / m ^{2 as a} solid. Provided is a processed paper characterized in that a uniform film layer is provided and a synthetic resin waterproof layer is provided on the other side of the base paper.
In the processed paper of the present invention, the coating amount of the acrylic resin emulsion is preferably in the range of 1.0 to 1.8 g / m ^{2 as} a solid.
The processed paper of the present invention is preferably embossed.
Further, the present invention has a corrugated cardboard structure in which the processed paper is fixed to at least one of the front and back of the corrugated core by adhering the synthetic resin waterproof layer to the core. Providing materials.
Furthermore, the present invention provides a food packaging container obtained by boxing the food packaging paper material.
Moreover, this invention provides the foodstuff in a container formed by putting a foodstuff in the said food packaging container.

本発明の加工紙は、基紙の一面側に水や水蒸気を透過可能なアクリル系樹脂不均一皮膜層が設けられ、前記基紙の他面側に合成樹脂防水層が設けられた構成なので、アクリル系樹脂不均一皮膜層を食品に接するように用いると、食品への接触面は通気性、透水性を有しており、合成樹脂防水層までの基紙部分は水分保持ができ、水滴が生じ難くなり、水滴によって食品表面が濡れて食感が悪くなる不具合を防ぐことができる。また水分を含んだ食品が付着し難くなる。
またアクリル系樹脂により基紙が完全に覆われていないので、水溶性接着剤が接着可能となり、水溶性接着剤を用いて容易に製函できる。
またエンボス加工することで、エンボス加工面と食品との接触面積が減り、更に付着し難くなる。またエンボス加工することで、過剰な水蒸気が発生し、容器底面等に水滴が溜まっても、食品に再付着する量が少なくなる。
また本発明の食品包装用紙材は、波形形状をなす中芯の表裏の少なくとも一方に、前記中芯に前記合成樹脂防水層を接着することによって前記加工紙を固定した段ボール構造を有するものなので、アクリル系樹脂不均一皮膜層を食品に接するように用いると、前述した加工紙と同様の効果が得られる。さらに段ボール構造としたことで、軽量で高剛性の容器が得られる。また本発明の食品包装用紙材は段ボール構造としたので、中芯に空気層が有り保温性がある。
また本発明の食品包装容器は、前記食品包装用紙材を製函して得られたものなので、食品が付着せず、食品の食感を良好に保ち、保温性に優れ、高剛性を有しており、水分を多く含み、熱がかかる食品の包装に好適である。
また本発明の容器入り食品は、前記食品包装容器に食品を入れて包装したものなので、内部の食品の食感が良好に保たれ、冷めにくく、食品が容器に付着し難く、携帯し易いものなので、テイクアウト用などとして利便性を有する。 The processed paper of the present invention has a structure in which an acrylic resin non-uniform film layer capable of transmitting water and water vapor is provided on one side of the base paper, and a synthetic resin waterproof layer is provided on the other side of the base paper. When the acrylic resin non-uniform coating layer is used so as to come into contact with food, the contact surface with the food has air permeability and water permeability, and the base paper portion up to the synthetic resin waterproof layer can retain moisture and water drops It becomes difficult to occur, and it is possible to prevent a problem that the food surface gets wet with water droplets and the texture becomes worse. Moreover, it becomes difficult for food containing moisture to adhere.
Further, since the base paper is not completely covered with the acrylic resin, a water-soluble adhesive can be bonded, and the box can be easily manufactured using the water-soluble adhesive.
Further, by embossing, the contact area between the embossed surface and the food is reduced, and it becomes difficult to adhere. Further, by embossing, even if excessive water vapor is generated and water droplets accumulate on the bottom surface of the container, the amount of re-adhering to the food is reduced.
In addition, the food packaging paper material of the present invention has a corrugated structure in which the processed paper is fixed by adhering the synthetic resin waterproof layer to the core on at least one of the front and back of the corrugated core. When the acrylic resin non-uniform film layer is used so as to come into contact with food, the same effect as the above-described processed paper can be obtained. Furthermore, a lightweight and highly rigid container can be obtained by using a corrugated cardboard structure. Moreover, since the food packaging paper material of the present invention has a corrugated cardboard structure, it has an air layer in the core and has heat retention.
The food packaging container of the present invention is obtained by boxing the food packaging paper material, so that the food does not adhere to it, the food texture of the food is kept good, the heat retaining property is excellent, and the rigidity is high. It is suitable for packaging foods that contain a lot of moisture and are heated.
In addition, since the food in a container of the present invention is packaged by putting food in the food packaging container, the texture of the internal food is kept well, it is difficult to cool, the food is difficult to adhere to the container, and is easy to carry Therefore, it is convenient for takeout.

以下、図面を参照して本発明を説明する。
図１は本発明に係る加工紙とそれを用いた段ボール構造を有する食品包装用紙材の第１の実施形態を示す図である。本発明の加工紙１は、基紙２の一面側にアクリル系樹脂不均一皮膜層３が設けられ、基紙２の他面側に合成樹脂防水層４が接着された構成になっている。前記アクリル系樹脂不均一皮膜層３は、アクリル系樹脂が基紙２表面を均一に被覆しておらず、このアクリル系樹脂不均一皮膜層３を通して水滴や水蒸気が基紙２側に浸透可能になっている。一方、合成樹脂防水層４は、基紙２の他面側を完全に被覆しており、水滴や水蒸気の漏れが生じないようになっている。 The present invention will be described below with reference to the drawings.
FIG. 1 is a view showing a first embodiment of a processed paper according to the present invention and a food packaging paper material having a corrugated cardboard structure using the processed paper. The processed paper 1 of the present invention has a configuration in which an acrylic resin non-uniform film layer 3 is provided on one surface side of a base paper 2 and a synthetic resin waterproof layer 4 is adhered to the other surface side of the base paper 2. The acrylic resin non-uniform coating layer 3 is not uniformly coated with the acrylic resin on the surface of the base paper 2, so that water droplets and water vapor can penetrate into the base paper 2 through the acrylic resin non-uniform coating layer 3. It has become. On the other hand, the synthetic resin waterproof layer 4 completely covers the other side of the base paper 2 so that water droplets and water vapor do not leak.

前記アクリル系樹脂不均一皮膜層３は、基紙２の一面側にアクリル系樹脂エマルジョンを、固形物で０．９〜２．７ｇ／ｍ^２の範囲となるように塗工、乾燥して形成されている。アクリル系樹脂エマルジョンの塗工量は、固形物で１．０〜１．８ｇ／ｍ^２の範囲とすることがより好ましい。このアクリル系樹脂の塗工量が固形物で０．９ｇ／ｍ^２未満であると、アクリル系樹脂による防水効果及び食品等の付着防止効果が不十分となる。一方、アクリル系樹脂の塗工量が固形物で２．７ｇ／ｍ^２を超えると、基紙２の表面を覆うアクリル系樹脂の均一度が増し、水滴や水蒸気の透過性が損なわれ、水滴や水蒸気が基紙２側に浸透不可能となり、食品の濡れ防止効果が不十分となる。 The acrylic resin non-uniform film layer 3 is formed by coating and drying an acrylic resin emulsion on one side of the base paper 2 so as to be in the range of 0.9 to 2.7 g / m ² as a solid. Has been. The coating amount of the acrylic resin emulsion is more preferably in the range of 1.0 to 1.8 g / m ² as a solid. When the coating amount of the acrylic resin is a solid substance of less than 0.9 g / m ² , the waterproofing effect by the acrylic resin and the effect of preventing the adhesion of food or the like are insufficient. On the other hand, when the coating amount of the acrylic resin exceeds 2.7 g / m ² in a solid state, the uniformity of the acrylic resin covering the surface of the base paper 2 increases, and the water droplet and water vapor permeability are impaired. And water vapor cannot penetrate into the base paper 2 and the effect of preventing the wetting of the food becomes insufficient.

このアクリル系樹脂不均一皮膜層３を形成するために用いるアクリル系樹脂エマルジョンとしては、例えば、アクリルポリマー、アクリル−スチレン共重合体等の共重合体エマルジョンや自己架橋型アクリル系共重合体エマルジョン等の各種エマルジョンを使用することができる。例えば、スチレン及びスチレン誘導体、アクリル酸（メタクリル酸）及びアクリル酸メチル、アクリル酸エチル、アクリル酸ブチル等のアクリル酸エステルやメタクリル酸メチル、メタクリル酸エチル、メタクリル酸ブチル等のメタクリル酸エステルなどを共重合したアクリル系共重合体を含むエマルジョンを用いることができる。またこのアクリル系樹脂エマルジョンは、各種の市販品の中から、食品包装用として安全性を確保し得る材料を選択使用することができる。 Examples of the acrylic resin emulsion used to form the acrylic resin non-uniform film layer 3 include copolymer emulsions such as acrylic polymers and acrylic-styrene copolymers, and self-crosslinking acrylic copolymer emulsions. Various emulsions can be used. For example, styrene and styrene derivatives, acrylic acid (methacrylic acid) and acrylic acid esters such as methyl acrylate, ethyl acrylate, and butyl acrylate, and methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, and butyl methacrylate are used together. An emulsion containing a polymerized acrylic copolymer can be used. The acrylic resin emulsion can be selected from various commercially available materials that can ensure safety for food packaging.

このアクリル系樹脂エマルジョンの基紙２への塗工は、オンマシン或いはオフマシンで使われているロールコーター、バーコーター、ブレードコーター、エアーナイフコーター、カーテンコーター、リバースコーター、グラビアコーター等の塗工装置を用いて行うことができる。本発明の加工紙１にあっては、基紙２の片面に均一なアクリル系樹脂皮膜を形成する必要がないので、塗工法には特に制限を受けず、オフセット印刷、スクリーン印刷、グラビア印刷、フレキソ印刷、スプレー印刷等の従来周知の印刷法を用いて塗工することができる。また、アクリル系樹脂エマルジョンを塗工した基紙２の乾燥条件は特に限定されず、使用するアクリル系樹脂エマルジョンの乾燥適温等に応じて乾燥温度や時間を適宜設定することが望ましい。 This acrylic resin emulsion is applied to the base paper 2 by using roll coater, bar coater, blade coater, air knife coater, curtain coater, reverse coater, gravure coater, etc., used in on-machine or off-machine. This can be done using an apparatus. In the processed paper 1 of the present invention, since it is not necessary to form a uniform acrylic resin film on one side of the base paper 2, the coating method is not particularly limited, and offset printing, screen printing, gravure printing, The coating can be performed using a conventionally known printing method such as flexographic printing or spray printing. The drying conditions of the base paper 2 coated with the acrylic resin emulsion are not particularly limited, and it is desirable to appropriately set the drying temperature and time according to the appropriate drying temperature of the acrylic resin emulsion to be used.

本発明の加工紙１の製造に用いられる基紙２としては、材質、厚さ、表面粗さの異なる種々の紙材を適宜選択して用いることができ、基紙２の選択の自由度が大きい点が本発明の一つの特徴になっている。すなわち、本発明の加工紙１は、基紙２の一面側に設けられるアクリル系樹脂不均一皮膜層３を均一に被覆しなくてもよく、表面粗さの小さな紙材は勿論、表面粗さの比較的大きな紙材であっても使用可能となる。このように、基紙２としては材質、厚さ、表面粗さの異なる種々の紙材を適宜選択して用いることができるが、後述するように、この加工紙１を段ボール構造を有する食品包装用紙材に加工して用いる場合、段ボール製造用のライナ原紙として通常使用されるロール紙等の紙材が好適に用いられる。この場合、基紙２の秤量は２０〜７０ｇ／ｍ^２、好ましくは３０〜６０ｇ／ｍ^２程度の紙材が好ましい。 As the base paper 2 used in the production of the processed paper 1 of the present invention, various paper materials having different materials, thicknesses, and surface roughness can be appropriately selected and used. The great point is one of the features of the present invention. That is, the processed paper 1 of the present invention does not need to uniformly coat the acrylic resin non-uniform film layer 3 provided on one surface side of the base paper 2, and the surface roughness is of course not only a paper material having a small surface roughness. Even a relatively large paper material can be used. As described above, various paper materials having different materials, thicknesses, and surface roughness can be appropriately selected and used as the base paper 2. As will be described later, the processed paper 1 is used for food packaging having a cardboard structure. When processed into a paper material, a paper material such as roll paper usually used as a liner base paper for corrugated board production is preferably used. In this case, a paper material having a basis weight of ^{20 to} 70 g / m ² , preferably about 30 to 60 g / m ² is preferable.

前記合成樹脂防水層４の材料となる合成樹脂としては、ポリエチレン系樹脂、ポリプロピレン系樹脂などのポリオレフィン系樹脂、塩化ビニル系樹脂、塩化ビニリデン系樹脂、フッ素樹脂などのハロゲン含有樹脂、ポリエステル系樹脂、ポリビニルアルコール（ＰＶＡ）系樹脂、アクリル系樹脂、アクリロニトリル−ブタジエン共重合体などの共重合体樹脂などが挙げられ、低価格で耐水性、耐久性に優れる等の点から、ポリエチレン系樹脂が好ましい。この合成樹脂防水層４は、基紙２の片面に溶融した樹脂をＴダイ等を用いて厚さ５〜１００μｍ、好ましくは１０〜１５μｍ程度の厚さにラミネートすることにより形成できる。または厚さ５〜１００μｍ、好ましくは１０〜１５μｍ程度の厚さの合成樹脂フィルムを基紙２に重ね合わせて加熱押圧し、該合成樹脂フィルムを基紙２の片面に接着させて形成することもできる。 Examples of the synthetic resin used as the material for the synthetic resin waterproof layer 4 include polyethylene resins, polyolefin resins such as polypropylene resins, vinyl chloride resins, vinylidene chloride resins, halogen-containing resins such as fluorine resins, polyester resins, Examples include polyvinyl alcohol (PVA) resins, acrylic resins, and copolymer resins such as acrylonitrile-butadiene copolymers. Polyethylene resins are preferred from the viewpoints of low cost, excellent water resistance and durability. This synthetic resin waterproofing layer 4 can be formed by laminating a resin melted on one side of the base paper 2 to a thickness of about 5 to 100 μm, preferably about 10 to 15 μm using a T die or the like. Alternatively, a synthetic resin film having a thickness of 5 to 100 μm, preferably about 10 to 15 μm, is superimposed on the base paper 2 and heated and pressed, and the synthetic resin film is adhered to one surface of the base paper 2. it can.

この加工紙１は、アクリル系樹脂不均一皮膜層３を食品に接するように用いると、食品への接触面は通気性、透水性を有しており、合成樹脂防水層４までの基紙２部分は水分保持ができ、水滴が生じ難くなり、水滴によって食品表面が濡れて食感が悪くなる不具合を防ぐことができる。また水分を含んだ食品が付着し難くなる。
またアクリル系樹脂により基紙２が完全に覆われていないので、水溶性接着剤が接着可能となり、水溶性接着剤を用いて容易に製函できる。 When the processed paper 1 is used so that the acrylic resin non-uniform film layer 3 is in contact with food, the contact surface to the food has air permeability and water permeability, and the base paper 2 up to the synthetic resin waterproof layer 4 is provided. The portion can retain moisture, makes it difficult for water droplets to be generated, and prevents a problem that the food surface becomes wet due to the water droplets, resulting in poor texture. Moreover, it becomes difficult for food containing moisture to adhere.
Further, since the base paper 2 is not completely covered with the acrylic resin, the water-soluble adhesive can be bonded, and can be easily manufactured using the water-soluble adhesive.

この加工紙１は、基紙２としてエンボス加工紙を用いることができ、或いは基紙２にアクリル系樹脂不均一皮膜層３と合成樹脂防水層４とを積層後にエンボス加工することができる。このエンボス加工は、製紙及び紙材加工分野で従来より周知の方法及び加工装置を用いて実行し得る。
加工紙１をエンボス加工することで、エンボス加工面と食品との接触面積が減り、更に食品が付着し難くなる。またエンボス加工することで、過剰な水蒸気が発生し、容器底面等に水滴が溜まっても、食品に再付着する量が少なくなる。 The processed paper 1 can be embossed paper as the base paper 2 or can be embossed after the acrylic resin non-uniform film layer 3 and the synthetic resin waterproof layer 4 are laminated on the base paper 2. This embossing can be performed using a method and a processing apparatus conventionally known in the papermaking and paper material processing fields.
By embossing the processed paper 1, the contact area between the embossed surface and the food is reduced, and the food is less likely to adhere. Further, by embossing, even if excessive water vapor is generated and water droplets accumulate on the bottom surface of the container, the amount of re-adhering to the food is reduced.

この加工紙１は、アクリル系樹脂不均一皮膜層３が食品と接するようにして、食品を包装するための紙材として単独で用いることができる他、図１に示すように、波形形状をなす中芯５の一方の面側に、中芯５に合成樹脂防水層４を接着することによってこの加工紙１を固定し、中芯５の他方の面側にライナ６を接着剤７で接着した段ボール構造を有する食品包装用紙材８として用いることができる。 This processed paper 1 can be used alone as a paper material for wrapping food such that the acrylic resin non-uniform film layer 3 is in contact with the food, and also has a corrugated shape as shown in FIG. The processed paper 1 is fixed to one surface side of the core 5 by bonding the synthetic resin waterproof layer 4 to the core 5, and the liner 6 is bonded to the other surface side of the core 5 with the adhesive 7. It can be used as a food packaging paper material 8 having a cardboard structure.

この段ボール構造を有する食品包装用紙材８は、加工紙１以外は従来の段ボール製造方法及び製造装置を用いて製造可能である。中芯５としては、例えば秤量３０〜１００ｇ／ｍ^２、好ましくは４０〜６０ｇ／ｍ^２程度のクラフト紙製の中芯が用いられ、ライナ６としては秤量２０〜７０ｇ／ｍ^２、好ましくは３０〜６０ｇ／ｍ^２程度のロール紙等を用いることができる。また中芯５とライナ６との接着用の接着剤７としては、澱粉系接着剤などの段ボール製造用接着剤として従来周知の接着剤が使用可能である。この食品包装用紙材８は、秤量７０〜２５０ｇ／ｍ^２、好ましくは１００〜２００ｇ／ｍ^２程度とするのが好ましい。 The food wrapping paper material 8 having this corrugated cardboard structure can be manufactured using a conventional corrugated cardboard manufacturing method and manufacturing apparatus other than the processed paper 1. As the core 5, for example, a kraft paper core having a weight of 30 to 100 g / m ² , preferably about 40 to 60 g / m ² is used. As the liner 6, a weight of 20 to 70 g / m ² , preferably 30 is used. Roll paper or the like of about ˜60 g / m ² can be used. As the adhesive 7 for bonding the core 5 and the liner 6, conventionally known adhesives can be used as corrugated board manufacturing adhesives such as starch adhesives. The food packaging material member 8, weighing 70~250g / ^{m 2,} preferably preferably set to 100 to 200 g / ^{m 2} approximately.

この食品包装用紙材８は、コルゲータなどと称される従来周知の段ボール製造設備を一部変更して製造可能である。この食品包装用紙材８において、波形形状に加工した中芯５の波頭と加工紙１の合成樹脂防水層４との接着は、該合成樹脂防水層４を加熱溶融せしめ、その一部を中芯５の波頭面に含浸させて両者を接着することにより、余分な接着剤を使用することなく接着固定することが望ましい。そのための製造設備としては、中芯５に加工紙１を重ねて加熱押圧し、中芯５の波頭面に溶融状態の合成樹脂防水層４の樹脂を含浸させる接着工程と、中芯５の残りの面に接着剤を塗布してライナ６を接着する糊付け工程とを別個に実施可能な装置を用いる必要がある。またライナ６の外側は、印刷面とすることができ、通常の食品包装用紙材８と同様に印刷して用いることができる。 The food wrapping paper 8 can be manufactured by partially changing a conventionally known corrugated board manufacturing facility called a corrugator. In this food wrapping paper material 8, the wave front of the core 5 processed into a corrugated shape and the synthetic resin waterproof layer 4 of the processed paper 1 are bonded by heating and melting the synthetic resin waterproof layer 4, and a part thereof is the core. It is desirable to bond and fix the two wave front surfaces by impregnating them together without using an extra adhesive. Manufacturing equipment for this purpose includes a bonding process in which the processed paper 1 is superimposed on the core 5 and heated and pressed to impregnate the wave front surface of the core 5 with the resin of the synthetic resin waterproof layer 4 in a molten state, and the remaining core 5 It is necessary to use an apparatus capable of separately performing the gluing step of applying the adhesive to the surface of the substrate and bonding the liner 6. Moreover, the outer side of the liner 6 can be used as a printing surface, and can be printed and used similarly to the normal food packaging paper material 8.

この食品包装用紙材８は、アクリル系樹脂不均一皮膜層を食品に接するように用いることによって、前述した加工紙１と同様の効果が得られる。さらに段ボール構造としたことで、軽量で高剛性の容器が得られる。また段ボール構造としたので、中芯に空気層が有り保温性に優れている。 The food wrapping paper material 8 can obtain the same effect as the processed paper 1 described above by using the acrylic resin non-uniform film layer so as to be in contact with food. Furthermore, a lightweight and highly rigid container can be obtained by using a corrugated cardboard structure. In addition, since it has a corrugated cardboard structure, it has an air layer in the core and is excellent in heat retention.

図２は本発明に係る食品包装用紙材の第２の実施形態を示す図である。本実施形態の食品包装用紙材９は、第１の実施形態の食品包装用紙材８と同様の構成要素を備えている他、ライナ６の中芯５側の面に合成樹脂防水層４を設け、中芯５の両面に合成樹脂防水層４を接着させたことを特徴としている。 FIG. 2 is a view showing a second embodiment of the food wrapping paper material according to the present invention. The food packaging paper material 9 of the present embodiment includes the same components as the food packaging paper material 8 of the first embodiment, and a synthetic resin waterproof layer 4 is provided on the surface of the liner 6 on the core 5 side. The synthetic resin waterproof layer 4 is adhered to both surfaces of the core 5.

この食品包装用紙材９は、中芯５の一方面に前記加工紙１の合成樹脂防水層４が接し、中芯５の他方面にライナ６に接着した合成樹脂防水層４が接した状態でそれぞれを重ね合わせ、加熱押圧して中芯５に加工紙１とライナ６とを一挙に接着して製造することが好ましい。図３は、この食品包装用紙材９の製造設備を例示するものであり、この製造設備では、それぞれロール巻きした加工紙１と、中芯原紙１０と、合成樹脂防水層４接着前のライナ６とを供給可能になっている。中芯原紙１０は、一対の段ロール１２，１２ａに送り込み、波形形状に段付け加工して中芯５とされる。ライナ６は、途中でコーター１１等により溶融した合成樹脂を塗工し、合成樹脂防水層４を接着する。途中で合成樹脂を塗工する方法に代えて、Ｔダイ等を用いてライナ６に合成樹脂防水層４を予め接着したラミネート紙を用いてもよい。 In this food wrapping paper material 9, the synthetic resin waterproof layer 4 of the processed paper 1 is in contact with one surface of the core 5, and the synthetic resin waterproof layer 4 bonded to the liner 6 is in contact with the other surface of the core 5. It is preferable to manufacture each of them by superimposing them, heating and pressing them, and bonding the processed paper 1 and the liner 6 to the core 5 all at once. FIG. 3 illustrates a production facility for the food wrapping paper material 9. In this production facility, each of the roll-processed processed paper 1, the core base paper 10, and the liner 6 before the synthetic resin waterproof layer 4 is bonded. And can be supplied. The core base paper 10 is fed into a pair of corrugated rolls 12 and 12a and stepped into a corrugated shape to form a core 5. The liner 6 coats the synthetic resin melted by the coater 11 or the like in the middle, and adheres the synthetic resin waterproof layer 4. Instead of the method of applying the synthetic resin in the middle, a laminated paper in which the synthetic resin waterproof layer 4 is bonded in advance to the liner 6 using a T die or the like may be used.

次いで、中芯５の一面側に加工紙１の合成樹脂防水層４を接触させると共に、中芯５の他面側にライナ６の合成樹脂防水層４を重ね合わせ、加熱盤と押圧搬送ベルト等を備えた加熱部１３に送り込んで約１００〜１８０℃程度に瞬間的に加熱する。この加熱温度は合成樹脂防水層４の樹脂の種類に応じて適宜変更可能である。これらの各紙材は加熱され、加工紙１の合成樹脂防水層４とライナ６の合成樹脂防水層４とは溶融し、中芯５の波頭に接したそれらの樹脂は中芯５の波頭部に含浸され、加熱と同時に押圧力を加えることで中芯５と加工紙１及びライナ６とが接着される。段ボール構造となった食品包装用紙材９は、冷却部１４で冷却され、その後カッター１５等で切断される。 Next, the synthetic resin waterproof layer 4 of the processed paper 1 is brought into contact with one surface side of the core 5, and the synthetic resin waterproof layer 4 of the liner 6 is overlaid on the other surface side of the core 5, and a heating panel, a pressure conveying belt, etc. And heated instantaneously to about 100 to 180 ° C. This heating temperature can be appropriately changed according to the type of resin of the synthetic resin waterproof layer 4. Each of these paper materials is heated, and the synthetic resin waterproof layer 4 of the processed paper 1 and the synthetic resin waterproof layer 4 of the liner 6 are melted, and those resins in contact with the wave front of the core 5 are the wave heads of the core 5. The core 5 is bonded to the processed paper 1 and the liner 6 by applying a pressing force simultaneously with heating. The food packaging paper material 9 having a cardboard structure is cooled by the cooling unit 14 and then cut by the cutter 15 or the like.

本実施形態の食品包装用紙材９は、第１の実施形態の食品包装用紙材８と同様の効果が得られる他、中芯５の一面側に加工紙１を、他面側に合成樹脂防水層４付きのライナ６とを溶着した構成としたので、段ボール構造を有する食品包装用紙材９を安価に提供することができる。また接着不良による部分剥離等を防止でき、接着線を薄く目立たなく、外観を良好にすることができる。 The food wrapping paper material 9 of the present embodiment can obtain the same effects as the food wrapping paper material 8 of the first embodiment, the processed paper 1 on one side of the core 5 and the synthetic resin waterproof on the other side. Since the liner 6 with the layer 4 is welded, the food packaging paper material 9 having a corrugated cardboard structure can be provided at a low cost. Further, partial peeling or the like due to poor adhesion can be prevented, and the adhesion line is thin and unnoticeable, and the appearance can be improved.

本発明の食品包装用紙材８，９は、函形等の所望の形状に製函して食品包装容器として利用することができる。図４は本発明に係る食品包装容器２６の製函工程を示す図であり、この食品包装容器２６は、函形の紙容器を製造するための従来周知の製造方法及び製造装置を用いて実行可能である（例えば、特公平８−１１４２８号公報参照。）。 The food packaging paper materials 8 and 9 of the present invention can be formed into a desired shape such as a box and used as a food packaging container. FIG. 4 is a diagram showing a box-making process of the food packaging container 26 according to the present invention. This food packaging container 26 is executed by using a conventionally known manufacturing method and manufacturing apparatus for manufacturing a box-shaped paper container. (For example, refer to Japanese Patent Publication No. 8-11428.)

図４に示す通り、この食品包装容器２６を作製するには、まず食品包装用紙材８，９を打抜機にて容器の展開形状に打ち抜くと同時に折り曲げ罫線を入れて紙容器素材２０を作製する（図４（ａ））。この紙容器素材２０は、四角形の底片２１と、その四辺からそれぞれ延出した４つの側片２２と、一対の側片２２の両側端から延出した糊付片２３と、一辺の側片２２に連設した蓋片２４とを備えている。それぞれの片の間は折り曲げ可能になっている。この紙容器素材２０において、食品包装用紙材８，９のアクリル系樹脂不均一皮膜層３は、食品と接する容器内面側になるように配置されている。 As shown in FIG. 4, in order to produce this food packaging container 26, first, the food packaging paper materials 8 and 9 are punched into a developed shape of the container by a punching machine, and at the same time, a folding ruled line is entered to produce a paper container material 20. (FIG. 4 (a)). The paper container material 20 includes a rectangular bottom piece 21, four side pieces 22 extending from the four sides, a glued piece 23 extending from both ends of the pair of side pieces 22, and one side piece 22. And a lid piece 24 provided continuously. Each piece can be folded. In this paper container material 20, the acrylic resin non-uniform film layer 3 of the food packaging paper materials 8 and 9 is arranged so as to be on the inner surface side of the container in contact with food.

次に、この紙容器素材２０を製函機に投入し、それぞれの糊付片２３に澱粉糊などの糊２５を塗布し（図４（ｂ）参照。）、それぞれの側片２２を立ち上げて箱状に組み立てる（図４（ｃ）参照。）。そして、それぞれの糊付片２３を重なり合う側片２２に接着固定させることで、開閉可能な蓋片２４を有する食品包装容器２６が作製される。糊付片２３の表面（糊２５を塗布する面）は、アクリル系樹脂不均一皮膜層３になっており、澱粉糊のような水溶性接着剤であっても接着可能である。 Next, the paper container material 20 is put into a box making machine, and a paste 25 such as starch paste is applied to each glued piece 23 (see FIG. 4B), and each side piece 22 is started up. Assembled into a box (see FIG. 4C). And the food packaging container 26 which has the cover piece 24 which can be opened and closed is produced by adhere | attaching and fixing each glued piece 23 to the side piece 22 which overlaps. The surface of the glued piece 23 (the surface on which the glue 25 is applied) is the acrylic resin non-uniform film layer 3 and can be bonded even with a water-soluble adhesive such as starch paste.

この食品包装容器２６は、前記食品包装用紙材８，９を製函して得られたものなので、食品が付着せず、食品の食感を良好に保ち、保温性に優れ、高剛性を有しており、水分を多く含み、熱がかかる食品の包装に好適である。
なお、本発明に係る食品包装容器は本例示に限定されるものではなく、種々変更が可能であり、その大きさや形状、開閉構造等は包装する食品の種類等に応じて適宜変更が可能である。また手提げ用バンドを取り付けたり、開閉或いは廃棄の際に函の分解が容易なミシン線を適所に設けることもできる。 Since the food packaging container 26 is obtained by boxing the food packaging paper materials 8 and 9, the food does not adhere to it, the food texture is kept good, the heat retaining property is excellent, and the rigidity is high. It is suitable for packaging foods that contain a lot of moisture and are heated.
Note that the food packaging container according to the present invention is not limited to this example, and various modifications are possible, and the size, shape, opening and closing structure, and the like can be appropriately changed according to the type of food to be packaged. is there. A hand strap can be attached, or a sewing machine wire that can be easily disassembled at the time of opening / closing or disposal can be provided at an appropriate position.

図５は、本発明に係る容器入り食品の一例を示す図である。この容器入り食品２８は、前記食品包装容器２６に食品２７を入れて蓋片２４を閉め、包装したものである。図５（ａ）は食品包装容器２６内に食品２７を入れた状態、（ｂ）は蓋片２４を閉めた状態をそれぞれ示している。 FIG. 5 is a diagram showing an example of a food in a container according to the present invention. This container-containing food 28 is obtained by putting food 27 in the food packaging container 26, closing the lid piece 24, and packaging. FIG. 5A shows a state where the food 27 is put in the food packaging container 26, and FIG. 5B shows a state where the lid piece 24 is closed.

食品包装容器２６に入れられる食品２７としては、特に限定されないが、耐水性、付着防止性、保温性に優れる前記食品包装容器２６の特性を利用し、水分を多く含み、熱がかかる食品などが特に好適である。この種の食品としては、例えば、中華饅頭（肉まん、あんまんなど）、蒸しパン、蒸し饅頭、シュウマイ、餃子、お好み焼き、たこ焼き、ビザ、コロッケやフライドチキンなどの油ちょう食品、電子レンジ加熱調理用の各種冷凍・冷蔵食品などが挙げられる。 The food 27 to be put in the food packaging container 26 is not particularly limited, but foods that contain a lot of moisture and are heated by utilizing the characteristics of the food packaging container 26 that is excellent in water resistance, adhesion prevention, and heat retention. Particularly preferred. Examples of this type of food include Chinese buns (meat and buns), steamed buns, steamed buns, Shumai, dumplings, okonomiyaki, takoyaki, visas, croquettes and fried chicken, and other foods for cooking in microwave ovens. Various frozen and refrigerated foods are listed.

本発明の容器入り食品２８は、前記食品包装容器２６に食品２７を入れて包装したものなので、内部の食品２７の食感が良好に保たれ、冷めにくく、食品２７が容器に付着し難く、携帯し易いものなので、テイクアウト用などとして利便性を有する。また本発明の容器入り食品２８を、電子レンジ加熱調理用の各種冷凍・冷蔵食品に適用し、食する直前に容器ごと電子レンジ加熱調理することもできる。 Since the foodstuff 28 in the container of the present invention is the foodstuff packaging container 26 packaged with the foodstuff 27, the texture of the foodstuff 27 inside is kept well, hard to cool, and the foodstuff 27 is difficult to adhere to the container. Since it is easy to carry, it is convenient for takeout. Moreover, the foodstuff 28 with a container of this invention can be applied to various frozen and refrigerated foods for microwave oven cooking, and the whole container can be cooked in a microwave oven just before eating.

（実施例１）
秤量３０ｇ／ｍ^２のロール紙の片面にポリエチレン樹脂を１３μｍの均一な厚みになるようにラミネートして合成樹脂防水層を形成した。次いで、このラミネート紙の未ラミネート面にフレキソ印刷機を用いてアクリル系樹脂エマルジョン（ジョンソンポリマー社製、ＰＤＸ−７６８７）を固形分が１．８ｇ／ｍ^２になるよう塗工して加工紙を作製した。
次に、コルゲート設備を用いて、裏ライナ用に前記加工紙、中芯用に坪量５０ｇ／ｍ^２のクラフト紙を前記加工紙のポリエチレン樹脂ラミネート層を接着剤として接着し、次いで表ライナ用に３０ｇ／ｍ^２のロール紙を中芯と澱粉糊で接着し、図１に示すような段ボール構造を有する食品包装用紙材を作製した。
次に、図４に示すように、この食品包装用紙材を打抜機にて、容器の展開形状に抜くと同時に、折り曲げ罫線を入れて紙容器素材とした。
次に、この紙容器素材を製函機を用いて製函し、図４（ｃ）に示す形状の食品包装容器を作製した。 (Example 1)
A synthetic resin waterproofing layer was formed by laminating polyethylene resin to a uniform thickness of 13 μm on one side of a roll paper weighing 30 g / m ² . Next, an acrylic resin emulsion (manufactured by Johnson Polymer Co., Ltd., PDX-7687) is applied to the non-laminated surface of the laminated paper using a flexographic printing machine so that the solid content becomes 1.8 g / m ^2. Produced.
Next, using the corrugated equipment, the processed paper for the back liner, the kraft paper having a basis weight of 50 g / m ² for the center core are bonded using the polyethylene resin laminate layer of the processed paper as an adhesive, and then for the front liner 30 g / m ² of roll paper was adhered to the core with starch paste to produce a food packaging paper material having a corrugated cardboard structure as shown in FIG.
Next, as shown in FIG. 4, the food packaging paper material was pulled out into a developed shape of the container by a punching machine, and at the same time a folding ruled line was put into a paper container material.
Next, this paper container material was boxed using a box making machine to produce a food packaging container having the shape shown in FIG.

（実施例２）
アクリル系樹脂エマルジョンを固形物が１．０ｇ／ｍ^２になるよう塗工した以外は、実施例１と同様にして食品包装容器を作製した。 (Example 2)
A food packaging container was produced in the same manner as in Example 1 except that the acrylic resin emulsion was applied so that the solid matter was 1.0 g / m ² .

（実施例３）
アクリル系樹脂エマルジョンを固形物が２．３ｇ／ｍ^２になるよう塗工した以外は、実施例１と同様にして食品包装容器を作製した。 (Example 3)
A food packaging container was produced in the same manner as in Example 1 except that the acrylic resin emulsion was applied so that the solid content was 2.3 g / m ² .

（実施例４）
食品包装用紙材にエンボス加工を施した以外は、実施例１と同様にして食品包装容器を作製した。 Example 4
A food packaging container was produced in the same manner as in Example 1 except that the food packaging paper material was embossed.

（比較例１）
アクリル系樹脂エマルジョンを固形物が０．８ｇ／ｍ^２になるよう塗工した以外は、実施例１と同様にして食品包装容器を作製した。 (Comparative Example 1)
A food packaging container was produced in the same manner as in Example 1 except that the acrylic resin emulsion was applied so that the solid content was 0.8 g / m ² .

（比較例２）
アクリル系樹脂エマルジョンを固形物が３．０ｇ／ｍ^２になるよう塗工した以外は、実施例１と同様にして食品包装容器を作製した。 (Comparative Example 2)
A food packaging container was produced in the same manner as in Example 1 except that the acrylic resin emulsion was applied so that the solid matter was 3.0 g / m ² .

＜評価方法＞
（付着防止性評価）
あんまん（冨士食品工業社製）を家庭用蒸機で１５分間蒸した後、実施例１〜４、比較例１〜２のそれぞれの食品包装容器に入れ、容器の上蓋にあんまんの上部が接するように蓋を閉め、容器を天地逆さまの状態で室温２５℃雰囲気で３分間放置する。３分放置後、容器の天地を戻し、蓋を開け容器内上面とあんまんの皮の付着状態を観察し、次の評価基準で付着防止性を評価した。
◎ 容器を逆さまにした時、自然にあんまんが落ちる。
○ 自由落下はしないが、手で容易に取れ、あんまんが容器についていない。
× あんまんの表皮層が容器に付着する。 <Evaluation method>
(Evaluation of adhesion prevention)
After steaming an bun (manufactured by Fuji Food Industry Co., Ltd.) with a household steamer for 15 minutes, put it in each food packaging container of Examples 1-4 and Comparative Examples 1-2 so that the upper part of the bun is in contact with the top lid of the container Close the lid and leave the container upside down at room temperature and 25 ° C for 3 minutes. After standing for 3 minutes, the top of the container was returned, the lid was opened, the state of adhesion between the upper surface of the container and the bun was observed, and the anti-adhesion property was evaluated by the following evaluation criteria.
◎ When the container is turned upside down, it will fall naturally.
○ Although it does not fall freely, it can be easily removed by hand and there is no bun in the container.
× The skin layer of Anman sticks to the container.

（濡れ防止性評価）
前記付着性試験と同様に、蒸したあんまんを実施例１〜４、比較例１〜２のそれぞれの食品包装容器に入れ、室温２５℃雰囲気で３０分間放置後、容器を開けてあんまん表面の濡れ状態を手で触って確かめ、次の評価基準により濡れ防止性を評価した。
◎◎ あんまんの皮はしっとりした表面で、ふっくらしている
◎ 手に湿り気を感じる程度、皮はややふやけている。
○ 手に水分がややつき、皮はふやけている。
× 皮が余剰水分を吸い、ぐっしょり濡れていて、触ると手に多量の水分がつき、ベタベタな状態。 (Wetting prevention evaluation)
Similar to the adhesion test, the steamed bun is placed in each of the food packaging containers of Examples 1 to 4 and Comparative Examples 1 and 2, and left at room temperature at 25 ° C. for 30 minutes, then the container is opened and the surface of the bun is wet. The condition was checked by hand, and the anti-wetting property was evaluated according to the following evaluation criteria.
◎◎ The skin of Anman has a moist surface and is soft ◎ The skin is slightly soft enough to feel dampness in the hands.
○ Moisture is slightly on the hands and the skin is soft.
× The skin absorbs excessive moisture and is soaked. When touched, the hands get a lot of moisture and are sticky.

実施例１〜４、比較例１〜２のそれぞれの食品包装容器について、付着防止性と濡れ防止性を評価し、その結果を表１にまとめて記す。 About each food packaging container of Examples 1-4 and Comparative Examples 1-2, adhesion prevention property and wetting prevention property are evaluated, and the result is put together in Table 1 and described.

表１の結果から、本発明に係る実施例１〜４の食品包装容器は、食品と接する側の面に固形分が０．９〜２．７ｇ／ｍ^２になるようにアクリル系樹脂エマルジョンを塗工してアクリル系樹脂不均一皮膜層を設けたことによって、蒸した中華饅頭のような水気が多く、熱い食品を入れて包装しても、食品の表面が容器内面に付着することがなく、十分な付着防止性が得られた。さらに食品表面から生じた蒸気及び水滴がアクリル系樹脂不均一皮膜層を通して基紙側に透過、保持されるので、結露した余剰水が食品表面に付着して食感を悪くすることが少なくなり、十分な濡れ防止性が得られた。
一方、アクリル系樹脂エマルジョンの塗工量が本発明の範囲よりも少ない比較例１の食品包装容器では、アクリル系樹脂による付着防止性が不十分であった。
またアクリル系樹脂エマルジョンの塗工量が本発明の範囲よりも多い比較例２の食品包装容器では、アクリル系樹脂皮膜が基紙の表面を完全に覆っているために、結露した余剰水が食品表面に付着して食感が悪くなった。 From the results of Table 1, the food packaging containers of Examples 1 to 4 according to the present invention have acrylic resin emulsion on the surface in contact with food so that the solid content is 0.9 to 2.7 g / m ^2. By coating and providing an acrylic resin non-uniform coating layer, there is a lot of moisture like steamed Chinese buns, so even if hot food is packaged, the food surface will not adhere to the inner surface of the container Sufficient adhesion preventing property was obtained. Furthermore, since the vapor and water droplets generated from the food surface are transmitted and held on the base paper side through the acrylic resin non-uniform film layer, it is less likely that excessive water condensed will adhere to the food surface and deteriorate the texture. Sufficient wettability was obtained.
On the other hand, in the food packaging container of Comparative Example 1 in which the coating amount of the acrylic resin emulsion is less than the range of the present invention, the adhesion preventing property by the acrylic resin was insufficient.
Further, in the food packaging container of Comparative Example 2 in which the coating amount of the acrylic resin emulsion is larger than the range of the present invention, since the acrylic resin film completely covers the surface of the base paper, the excess water condensed is food. The texture on the surface deteriorated.

本発明の加工紙及び食品包装用紙材の一例を示す断面図である。It is sectional drawing which shows an example of the processed paper and food packaging paper material of this invention. 本発明の食品包装用紙材の他の例を示す断面図である。It is sectional drawing which shows the other example of the food packaging paper material of this invention. 食品包装用紙材の製造に用いる製造設備の一例を示す構成図である。It is a block diagram which shows an example of the manufacturing equipment used for manufacture of a food packaging paper material. 食品包装容器の製造工程を例示する斜視図である。It is a perspective view which illustrates the manufacturing process of a food packaging container. 食品包装容器に食品を入れ包装した容器入り食品を例示する斜視図である。It is a perspective view which illustrates the foodstuff in a container which put and packed the foodstuff in the food packaging container.

符号の説明Explanation of symbols

１…加工紙、２…基紙、３…アクリル系樹脂不均一皮膜層、４…合成樹脂防水層、５…中芯、６…ライナ、７…接着剤、８，９…食品包装用紙材、１０…中芯原紙、１１…コーター、１２，１２ａ…段ロール、１３…加熱部、１４…冷却部、１５…カッター、２０…紙容器素材、２１…底片、２２…側片、２３…糊付片、２４…蓋片、２５…糊、２６…食品包装容器、２７…食品、２８…容器入り食品。
DESCRIPTION OF SYMBOLS 1 ... Process paper, 2 ... Base paper, 3 ... Acrylic resin non-uniform | heterogenous coating layer, 4 ... Synthetic resin waterproofing layer, 5 ... Core, 6 ... Liner, 7 ... Adhesive, 8, 9 ... Food packaging paper material, DESCRIPTION OF SYMBOLS 10 ... Core raw paper, 11 ... Coater, 12, 12a ... Corrugated roll, 13 ... Heating part, 14 ... Cooling part, 15 ... Cutter, 20 ... Paper container raw material, 21 ... Bottom piece, 22 ... Side piece, 23 ... With paste 24, lid piece, 25 ... glue, 26 ... food packaging container, 27 ... food, 28 ... food in container.

Claims

基紙の一面側にアクリル系樹脂エマルジョンが固形物で０．９〜２．７ｇ／ｍ^２となるように塗工、乾燥されてなるアクリル系樹脂不均一皮膜層が設けられ、前記基紙の他面側に合成樹脂防水層が設けられたことを特徴とする加工紙。 An acrylic resin non-uniform film layer is provided on one side of the base paper so that the acrylic resin emulsion is 0.9 to 2.7 g / m ^{2 in} solid form and dried. A processed paper characterized in that a synthetic resin waterproof layer is provided on the other side.

前記アクリル系樹脂エマルジョンの塗工量が固形物で１．０〜１．８ｇ／ｍ^２である請求項１に記載の加工紙。 The processed paper according to claim 1, wherein the coating amount of the acrylic resin emulsion is 1.0 to 1.8 g / m ² in solid form.

エンボス加工がなされている請求項１又は２に記載の加工紙。 The processed paper according to claim 1 or 2, which has been embossed.

波形形状をなす中芯の表裏の少なくとも一方に、前記中芯に前記合成樹脂防水層を接着することによって請求項１〜３のいずれかに記載の加工紙を固定した段ボール構造を有することを特徴とする食品包装用紙材。 It has a corrugated board structure which fixed the processed paper in any one of Claims 1-3 by adhere | attaching the said synthetic resin waterproofing layer to the said core at least one of the front and back of the core which makes a waveform shape Food packaging paper material.

請求項４に記載の食品包装用紙材を製函して得られる食品包装容器。 A food packaging container obtained by boxing the food packaging paper material according to claim 4.

請求項５に記載の食品包装容器の中に食品を入れて包装してなる容器入り食品。
Food in a container obtained by putting food in the food packaging container according to claim 5 and packaging it.