JP2012144259A - Base paper for lid material - Google Patents
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- JP2012144259A JP2012144259A JP2011001913A JP2011001913A JP2012144259A JP 2012144259 A JP2012144259 A JP 2012144259A JP 2011001913 A JP2011001913 A JP 2011001913A JP 2011001913 A JP2011001913 A JP 2011001913A JP 2012144259 A JP2012144259 A JP 2012144259A
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Abstract
Description
本発明は、植物繊維を主成分とする原紙に水性樹脂を含有せしめたことを特徴とする、熱湯を注いで調理するカップラーメンや、カップ焼きそば用のアルミレス蓋材の基紙に関する。 The present invention relates to a base sheet for cup ramen for pouring hot water and cooking, or an aluminum-less lid for cup fried noodles, characterized in that an aqueous resin is contained in a base paper mainly composed of vegetable fibers.
カップラーメンや、カップ焼きそばは、熱湯を注ぐときに、カップ状またはトレー状の容器にイージーピール層で接着されているイージーピール蓋材を半分程度開封してから、熱湯を注ぐが、注ぐときにその蓋が剥がしたときの反り返った状態を保つことにより（この状態のことをデッドホールド性という）、容易に熱湯を注ぐ事ができる。紙と樹脂フィルムだけの積層では、蓋を剥がした後も、手を離してしまうとすぐに閉蓋して注ぎにくくなってしまい、熱湯による火傷等の危険もある。このデッドホールド性を持たせるために、従来よりアルミ箔を蓋材用基紙に積層させている。 For cup ramen and cup fried noodles, when pouring hot water, open about half of the easy peel lid that is adhered to the cup-shaped or tray-shaped container with an easy peel layer, and then pour hot water. By keeping the warped state when the lid is peeled off (this state is called dead hold property), hot water can be poured easily. In the case of laminating only paper and a resin film, even after the lid is peeled off, if the hand is released, the lid is quickly closed, making it difficult to pour, and there is a risk of burns from hot water. In order to provide this dead hold property, an aluminum foil is conventionally laminated on a base paper for a lid material.
しかしながら、蓋材の構成材料にアルミ箔が存在すると、異物混入などを検査する金属探知機等による検査ができないために安全性の確保に支障があるという問題がある。また、焼却や廃棄に対してアルミ箔が残存するという環境問題もある。さらに、電子レンジで再加熱等をするときにアルミ箔の存在が弊害となる。 However, when an aluminum foil is present in the constituent material of the lid member, there is a problem in that it is difficult to ensure safety because it cannot be inspected by a metal detector or the like for inspecting contamination. There is also an environmental problem that aluminum foil remains for incineration and disposal. Furthermore, the presence of aluminum foil becomes a harmful effect when reheating or the like in a microwave oven.
この課題に対し、蓋材の構成に発泡層を設けてデッドホールド性を持たせる方法（特許文献１）や、蓋材にミシン目を入れて蓋を剥がしたときにそのミシン目で折り曲げて熱湯を注ぐ方法（特許文献２）等が提案されているが、何れも蓋材の加工工程が増えることになり、もっと容易に蓋材が提供されることが望まれている。 In response to this problem, a method of providing a foam layer in the structure of the lid material to provide dead hold properties (Patent Document 1), or when the lid material is perforated and the lid is peeled off, the hot water is bent at the perforation. (Patent Document 2) and the like have been proposed, but in any case, the number of steps for processing the cover material is increased, and it is desired that the cover material be provided more easily.
本発明の課題は、蓋材用基紙にデッドホールド性を従来の蓋材用基紙より強く持たせることにより、その後の蓋材製造の加工工程をより簡便にする蓋材用基紙を提供することである。 An object of the present invention is to provide a lid base paper that makes the lid base paper have a dead hold property stronger than that of the conventional lid base paper, thereby simplifying the subsequent processing steps for lid production. It is to be.
本発明は、上記課題を解決することを目的としてなされたもので、その手段としては、サイズ性を有しない原紙に、ガラス転移温度が５℃〜１５℃の水性樹脂を、対パルプ固形分１０〜４０質量％含浸せしめることにより、熱湯を注ぐ場合に蓋を剥がして折り返したときに硬すぎて反発して元の位置に戻ったり、柔らかすぎてくたくたして元の位置に戻ったりしない、適度な硬さを有してデッドホールド性をもつカップラーメンやカップ焼きそばの蓋材用基紙を提供することができる。 The present invention has been made for the purpose of solving the above-mentioned problems. As the means, an aqueous resin having a glass transition temperature of 5 ° C. to 15 ° C. and a solid content of 10 By impregnating ~ 40% by mass, when pouring hot water, when the lid is peeled off and folded back, it is too hard and repels and returns to its original position, and it is too soft and does not return to its original position. It is possible to provide a base sheet for a lid material for cup ramen and cup fried noodles having a high hardness and a dead hold property.
本発明は、カップラーメンやカップ焼きそばに熱湯を注ぐ場合に、蓋を剥がして折り返したときに硬すぎて反発して元の位置に戻ったり、柔らかすぎてくたくたして元の位置に戻ったりしない、適度な硬さを有してデッドホールド性をもつカップラーメンやカップ焼きそばの蓋材用基紙を提供できる。 In the present invention, when pouring hot water into cup ramen or cup fried noodles, when the lid is peeled off and folded back, it is too hard to repel and return to its original position, or it is too soft and does not return to its original position Therefore, it is possible to provide a cup ramen or a cup fried noodle base paper having a moderate hardness and a dead hold property.
本発明者らは、鋭意検討の結果、カップラーメンやカップ焼きそばの、デッドホールド性をもつ蓋材用基紙を製造する場合に、植物繊維を主成分とする、サイズ性を有しない原紙に、ガラス転移温度が５℃〜１５℃の水性樹脂を、対パルプ固形分１０〜４０質量％含浸せしめることにより、熱湯を注ぐ場合に蓋を剥がして折り返したときに、硬すぎて反発して元の位置に戻ったり、柔らかすぎてくたくたして元の位置に戻ったりしない、適度な硬さを有してデッドホールド性もつカップラーメンやカップ焼きそばの蓋材用基紙を得られることを見出し本発明に至った。 As a result of diligent study, the inventors of the present invention, when manufacturing a base paper for lid materials having a dead hold property, such as cup ramen and cup fried noodles, on a base paper that has vegetable fiber as a main component and has no size property, By impregnating an aqueous resin having a glass transition temperature of 5 ° C. to 15 ° C. with a solid content of 10 to 40% by mass with respect to pulp solids, when pouring hot water and turning it back, it is too hard and rebounds to the original The present invention finds that it is possible to obtain a cup ramen or a cup fried noodle base paper that has a moderate hardness and does not return to its original position after returning to a position or being too soft and knocked. It came to.
本発明における植物繊維とは、叩解により容易に強度が向上する木材繊維、靱皮（じんぴ）繊維、雁皮（がんぴ）繊維等からなる植物由来の繊維である。本発明においては、特に木材繊維が、入手が容易である点で好ましい。木材繊維の具体例としては、針葉樹晒クラフトパルプ（Ｎ−ＢＫＰ）、針葉樹晒亜硫酸塩パルプ（Ｎ−ＢＳＰ）、広葉樹晒クラフトパルプ（Ｌ−ＢＫＰ）、広葉樹晒亜硫酸塩パルプ（Ｌ−ＢＳＰ）等がある。 The plant fiber in the present invention is a plant-derived fiber consisting of wood fiber, bast fiber, ganphi fiber, etc. whose strength is easily improved by beating. In the present invention, wood fibers are particularly preferable because they are easily available. Specific examples of wood fibers include softwood bleached kraft pulp (N-BKP), softwood bleached sulfite pulp (N-BSP), hardwood bleached kraft pulp (L-BKP), hardwood bleached sulfite pulp (L-BSP) and the like. There is.
本発明における植物繊維を主成分とする原紙としては、単層又は多層で抄造されたものを用いることが可能である。また、当該原紙の坪量としては、６０〜１１０ｇ／ｍ２の範囲であることが好ましい。坪量をこの範囲とすることにより、当該原紙に好適な剛度を保持させることが容易となり、目的とする蓋材用基紙のデッドホールド性を得られやすい。 As the base paper mainly composed of vegetable fiber in the present invention, it is possible to use a paper made in a single layer or multiple layers. As the basis weight of the base paper is preferably in the range of 60~110g / m 2. By setting the basis weight within this range, it becomes easy to maintain a suitable rigidity for the base paper, and it is easy to obtain the desired dead hold property of the base material for lid material.
本発明で使用する水性樹脂とは、水分散性樹脂を言い、例えばアクリル酸メチル、アクリル酸エチル、アクリル酸ｉ−又はｎ−ブチル、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸ｉ−又はｎ−ブチルを単独で又はスチレン、アクリルニトリルなどのモノマーと一緒に乳化重合した（メタ）アクリル酸エステルエマルジョン、乳化重合によって得られたスチレン−ブタジエンゴム（ＳＢＲ）エマルジョン及びエチレン酢酸ビニル共重合体エマルジョン等の水分散性樹脂である。本発明においては、デッドホールド性の効果の大きさから、水性樹脂のガラス転移温度は５〜１５℃、好ましくは６℃〜１４℃、特に好ましくは８℃〜１２℃であり、水性樹脂の原紙への含浸量は対パルプ固形分１０〜４０質量％、好ましくは１５〜３５質量％、特に好ましくは２０〜３０質量％である。 The aqueous resin used in the present invention refers to a water-dispersible resin, for example, methyl acrylate, ethyl acrylate, i- or n-butyl acrylate, methyl methacrylate, ethyl methacrylate, i- or n-methacrylate. (Meth) acrylic acid ester emulsion obtained by emulsion polymerization of butyl alone or together with monomers such as styrene and acrylonitrile, styrene-butadiene rubber (SBR) emulsion and ethylene vinyl acetate copolymer emulsion obtained by emulsion polymerization, etc. It is a water dispersible resin. In the present invention, the glass transition temperature of the aqueous resin is 5 to 15 ° C., preferably 6 to 14 ° C., particularly preferably 8 to 12 ° C. The impregnation amount into the solid content of pulp is 10 to 40% by mass, preferably 15 to 35% by mass, and particularly preferably 20 to 30% by mass.
また、さらに、本発明の蓋材用基紙は、デッドホールド性を損なわない範囲で、紙力向上剤、顔料、填料、染料、歩留まり向上剤等、各種添加剤を含有させてもよい。 Further, the lid base paper of the present invention may contain various additives such as a paper strength improver, a pigment, a filler, a dye, and a yield improver as long as the dead hold property is not impaired.
次に、本発明を実施例及び比較例によって、更に具体的に説明するが、本発明はこれらに限定されるものではない。尚、以下、ガラス転移温度を「Ｔｇ」と記す。 Next, although an example and a comparative example explain the present invention still more concretely, the present invention is not limited to these. Hereinafter, the glass transition temperature is referred to as “Tg”.
＜実施例１＞
広葉樹晒クラフトパルプ（Ｌ−ＢＫＰ）を７０質量％、針葉樹晒クラフトパルプ（Ｎ−ＢＫＰ）を３０質量％で混合し、叩解機によりＣＳＦ４００ｍｌとなるように叩解処理した。このパルプスラリーを用い長網抄紙機で、坪量８０ｇ／ｍ２の原紙を抄紙した。次にその坪量８０ｇ／ｍ２の原紙に、Ｔｇ１０℃のアクリル酸エステルエマルジョン（ウルトラゾールＢ−９００，ガンツ化成製）を、対パルプ固形分で３０質量％含浸し、蓋材用基紙を得た。
<Example 1>
Hardwood bleached kraft pulp (L-BKP) was mixed at 70% by mass and softwood bleached kraft pulp (N-BKP) was mixed at 30% by mass, and beaten with a beating machine to 400 ml of CSF. Using this pulp slurry, a base paper having a basis weight of 80 g / m 2 was made with a long paper machine. Next, an acrylic ester emulsion (Ultrazol B-900, manufactured by Ganz Kasei Co., Ltd.) having a Tg of 10 ° C. is impregnated into the base paper having a basis weight of 80 g / m 2 at a solid content of 30% by mass with respect to pulp solids, Obtained.
＜実施例２＞
実施例１の坪量８０ｇ／ｍ２の原紙に、Ｔｇ１５℃のアクリル酸エステルエマルジョン（ウルトラゾールＢ−６００，ガンツ化成製）を、対パルプ固形分で３０％含浸し、蓋材用基紙を得た。
<Example 2>
The base paper of Example 1 having a basis weight of 80 g / m 2 was impregnated with an acrylic ester emulsion (Ultrazol B-600, manufactured by Ganz Kasei Co., Ltd.) having a Tg of 15 ° C. at a solid content of 30%, and a base paper for a lid material was used. Obtained.
＜実施例３＞
実施例１の坪量８０ｇ／ｍ２の原紙に、Ｔｇ１２℃のＳＢＲエマルジョン（Ｅ−１７９４，旭化成ケミカルズ製）を、対パルプ固形分で３０質量％含浸し、蓋材用基紙を得た。
<Example 3>
The base paper having a basis weight of 80 g / m 2 of Example 1 was impregnated with an SBR emulsion having a Tg of 12 ° C. (E-1794, manufactured by Asahi Kasei Chemicals Co., Ltd.) in an amount of 30% by mass with respect to the solid content of pulp to obtain a base paper for a lid material.
＜実施例４＞
実施例１の坪量８０ｇ／ｍ２の原紙に、Ｔｇ１０℃のアクリル酸エステルエマルジョン（ウルトラゾールＢ−９００，ガンツ化成製）を、対パルプ固形分で２０質量％含浸し、蓋材用基紙を得た。
<Example 4>
The base paper of Example 1 having a basis weight of 80 g / m 2 was impregnated with 20 mass% of acrylic ester emulsion (Ultrazol B-900, manufactured by Ganz Kasei) with a Tg of 10 ° C. as a solid content of pulp, and a base paper for a lid material Got.
＜実施例５＞
実施例１の坪量８０ｇ／ｍ２の原紙に、Ｔｇ１０℃のエチレン酢ビエマルジョン（Ｍ−９３０，昭和高分子製）を、対パルプ固形分で３０％含浸し、蓋材用基紙を得た。
<Example 5>
The base paper of Example 1 having a basis weight of 80 g / m 2 was impregnated with 30% ethylene pulp emulsion (M-930, manufactured by Showa Polymer) at a Tg of 10 ° C. to obtain a base paper for a lid material. It was.
＜比較例１＞
実施例１の坪量８０ｇ／ｍ２の原紙に、Ｔｇ１０℃のアクリル酸エステルエマルジョン（ウルトラゾールＢ−９００，ガンツ化成製）を、対パルプ固形分で７．５質量％含浸し、蓋材用基紙を得た。
<Comparative Example 1>
The base paper of Example 1 with a basis weight of 80 g / m 2 was impregnated with 7.5% by mass of an acrylic acid ester emulsion (Ultrazol B-900, manufactured by Ganz Kasei Co., Ltd.) having a Tg of 10 ° C. in terms of solid content with respect to pulp. A base paper was obtained.
＜比較例２＞
実施例１の坪量８０ｇ／ｍ２の原紙に、Ｔｇ０℃のアクリル酸エステルエマルジョン（ウルトラゾールＬＴＣ−１００，ガンツ化成製）を、対パルプ固形分で３０質量％含浸し、蓋材用基紙を得た。
<Comparative example 2>
The base paper of Example 1 having a basis weight of 80 g / m 2 was impregnated with an acrylic ester emulsion (Ultrazol LTC-100, manufactured by Ganz Kasei) having a Tg of 0 ° C. in a solid content of 30% by weight with respect to pulp solids. Got.
＜比較例３＞
実施例１の坪量８０ｇ／ｍ２の原紙に、Ｔｇ２８℃のアクリル酸エステルエマルジョン（ウルトラゾールＮ−２８，ガンツ化成製）を、対パルプ固形分で３０％質量含浸し、蓋材用基紙を得た。
<Comparative Example 3>
The base paper of Example 1 with a basis weight of 80 g / m 2 was impregnated with an acrylic ester emulsion (Ultrazol N-28, manufactured by Ganz Kasei Co., Ltd.) having a Tg of 28 ° C. by 30% by mass with respect to the solid content of the pulp. Got.
＜比較例４＞
実施例１の坪量８０ｇ／ｍ２の原紙に、Ｔｇ１０℃のアクリル酸エステルエマルジョン（ウルトラゾールＢ−９００，ガンツ化成製）を、対パルプ固形分で４５質量％含浸し、蓋材用基紙を得た。
<Comparative example 4>
The base paper of Example 1 having a basis weight of 80 g / m 2 was impregnated with an acrylic acid ester emulsion (Ultrazol B-900, manufactured by Ganz Kasei) having a Tg of 10 ° C. in a solid content of 45% by mass with respect to pulp solids. Got.
＜比較例５＞
広葉樹晒クラフトパルプ（Ｌ−ＢＫＰ）を７０質量％、針葉樹晒クラフトパルプ（Ｎ−ＢＫＰ）を３０質量％で混合し、叩解機によりＣＳＦ４００ｍｌとなるように叩解処理した。このパルプスラリーを用い長網抄紙機で、坪量５０ｇ／ｍ２の原紙を抄紙した。次にその坪量５０ｇ／ｍ２の原紙に、Ｔｇ１０℃のアクリル酸エステルエマルジョン（ウルトラゾールＢ−９００，ガンツ化成製）を、対パルプ固形分で３０質量％含浸し、蓋材用基紙を得た。
<Comparative Example 5>
Hardwood bleached kraft pulp (L-BKP) was mixed at 70% by mass and softwood bleached kraft pulp (N-BKP) was mixed at 30% by mass, and beaten with a beating machine to 400 ml of CSF. Using this pulp slurry, a base paper with a basis weight of 50 g / m 2 was made with a long paper machine. Next, an acrylic ester emulsion (Ultrazol B-900, manufactured by Ganz Kasei Co., Ltd.) having a Tg of 10 ° C. is impregnated into the base paper having a basis weight of 50 g / m 2 at a solid content of 30% by mass with respect to pulp solids. Obtained.
＜比較例６＞
広葉樹晒クラフトパルプ（Ｌ−ＢＫＰ）を７０質量％、針葉樹晒クラフトパルプ（Ｎ−ＢＫＰ）を３０質量％で混合し、叩解機によりＣＳＦ４００ｍｌとなるように叩解処理した。このパルプスラリーを用い長網抄紙機で、坪量１２０ｇ／ｍ２の原紙を抄紙した。次にその坪量１２０ｇ／ｍ２原紙に、Ｔｇ１０℃のアクリル酸エステルエマルジョン（ウルトラゾールＢ−９００，ガンツ化成製）を、対パルプ固形分で３０質量％含浸し、蓋材用基紙を得た。
<Comparative Example 6>
Hardwood bleached kraft pulp (L-BKP) was mixed at 70% by mass and softwood bleached kraft pulp (N-BKP) was mixed at 30% by mass, and beaten with a beating machine to 400 ml of CSF. Using this pulp slurry, a base paper having a basis weight of 120 g / m 2 was made with a long paper machine. Next, the basis weight of 120 g / m 2 base paper was impregnated with an acrylic ester emulsion (Ultrazol B-900, manufactured by Ganz Kasei Co., Ltd.) having a Tg of 10 ° C. in a solid content of 30% by mass with respect to pulp solids to obtain a base paper for a lid material. It was.
（デッドホールド性の評価）
得られた蓋材用基紙をカップラーメンの蓋用（直径１４１ｍｍ＋タブ）に裁断し、カップにイージーピール層を介して接着を行う。次にお湯を注ぐために蓋材を中心部まで剥がしてデッドホールド性を評価した。
○−お湯を注ぎ易い様に剥がした位置で、ほとんど反り返った状態を保ち、元の 位置に戻らずに形を維持していてお湯が注ぎ易い。
×−剥がした蓋材が、柔らか過ぎて元の蓋の位置近くまで戻るか、或いは硬すぎ て反発して元の位置近くに戻るかで、ほぼ剥がした位置で反り返った形を維 持せず、お湯が注ぎにくい。
(Evaluation of dead hold)
The obtained base material for lid material is cut into a cup ramen lid (141 mm diameter + tab) and bonded to the cup through an easy peel layer. Next, in order to pour hot water, the lid material was peeled off to the center and the dead hold property was evaluated.
○-It is easy to pour hot water because it keeps almost warped at the position where it has been peeled off so that it is easy to pour hot water and maintains its shape without returning to the original position.
×-If the peeled lid material is too soft and returns to the original lid position, or is too hard and rebounds and returns to the original position, it does not maintain the shape of the warped at the almost peeled position. It is difficult to pour hot water.
以上の評価結果を表１に示す。
実施例１から５までは、何れも蓋材が剥がした位置近くで反り返った形を保ち、お湯が注ぎやすい。
しかし比較例１から６は何れも蓋材が剥がした位置近くに反り返った形を維持せずカップ近くまで戻り、お湯が注ぎにくい。
In each of Examples 1 to 5, hot water can be easily poured while keeping the shape of warping near the position where the lid member was peeled off.
However, all of Comparative Examples 1 to 6 do not maintain the shape of warping near the position where the lid member is peeled off, and return to the vicinity of the cup, making it difficult to pour hot water.
Claims (4)
The base material for a lid according to any one of claims 1 to 3, wherein the base paper containing vegetable fibers as a main component has a basis weight of 60 to 110 g / m 2 made in a single layer or multiple layers. paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011001913A JP5623295B2 (en) | 2011-01-07 | 2011-01-07 | Base paper for lid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011001913A JP5623295B2 (en) | 2011-01-07 | 2011-01-07 | Base paper for lid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09117380A (en) * | 1995-08-28 | 1997-05-06 | Westvaco Corp | Paperboard container for food |
| JPH11310274A (en) * | 1998-04-27 | 1999-11-09 | Ma Packaging:Kk | Cover |
| JP2003095309A (en) * | 2001-09-20 | 2003-04-03 | Toppan Printing Co Ltd | Tray vessel |
| JP2008280063A (en) * | 2007-05-10 | 2008-11-20 | Toppan Printing Co Ltd | Wrapping material |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09117380A (en) * | 1995-08-28 | 1997-05-06 | Westvaco Corp | Paperboard container for food |
| JPH11310274A (en) * | 1998-04-27 | 1999-11-09 | Ma Packaging:Kk | Cover |
| JP2003095309A (en) * | 2001-09-20 | 2003-04-03 | Toppan Printing Co Ltd | Tray vessel |
| JP2008280063A (en) * | 2007-05-10 | 2008-11-20 | Toppan Printing Co Ltd | Wrapping material |
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