JP5623295B2 - Base paper for lid - Google Patents
Base paper for lid Download PDFInfo
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- JP5623295B2 JP5623295B2 JP2011001913A JP2011001913A JP5623295B2 JP 5623295 B2 JP5623295 B2 JP 5623295B2 JP 2011001913 A JP2011001913 A JP 2011001913A JP 2011001913 A JP2011001913 A JP 2011001913A JP 5623295 B2 JP5623295 B2 JP 5623295B2
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- base paper
- pulp
- lid
- mass
- lid material
- Prior art date
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- 239000000463 material Substances 0.000 claims description 23
- 239000007787 solid Substances 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000000839 emulsion Substances 0.000 claims description 16
- 229920005989 resin Polymers 0.000 claims description 11
- 239000011347 resin Substances 0.000 claims description 11
- 230000009477 glass transition Effects 0.000 claims description 6
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 2
- 239000002356 single layer Substances 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 claims 1
- 239000000123 paper Substances 0.000 description 39
- 230000000052 comparative effect Effects 0.000 description 8
- 239000002655 kraft paper Substances 0.000 description 8
- -1 acrylic ester Chemical class 0.000 description 7
- 239000000835 fiber Substances 0.000 description 7
- 235000012149 noodles Nutrition 0.000 description 7
- 239000011121 hardwood Substances 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000010009 beating Methods 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 239000011122 softwood Substances 0.000 description 4
- 229920002522 Wood fibre Polymers 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000013055 pulp slurry Substances 0.000 description 3
- 235000013311 vegetables Nutrition 0.000 description 3
- 239000002025 wood fiber Substances 0.000 description 3
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
- 125000005396 acrylic acid ester group Chemical group 0.000 description 2
- 238000007720 emulsion polymerization reaction Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- CFVWNXQPGQOHRJ-UHFFFAOYSA-N 2-methylpropyl prop-2-enoate Chemical compound CC(C)COC(=O)C=C CFVWNXQPGQOHRJ-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 239000004908 Emulsion polymer Substances 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
- B65D77/10—Container closures formed after filling
- B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
- Package Specialized In Special Use (AREA)
- Packages (AREA)
- Life Sciences & Earth Sciences (AREA)
- Food Science & Technology (AREA)
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 the wood fibers, softwood bleached kraft pulp (N-BKP), needle bleached sulfite São pulp (N-BSP), hardwood bleached kraft pulp (L-BKP), hardwood bleached sulfite São pulp (L -BSP).
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)
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US5660898A (en) * | 1995-08-28 | 1997-08-26 | Westvaco Corporation | Heat sealed, ovenable food cartons |
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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