JP4839329B2 - Food packaging sheet - Google Patents
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- JP4839329B2 JP4839329B2 JP2008021847A JP2008021847A JP4839329B2 JP 4839329 B2 JP4839329 B2 JP 4839329B2 JP 2008021847 A JP2008021847 A JP 2008021847A JP 2008021847 A JP2008021847 A JP 2008021847A JP 4839329 B2 JP4839329 B2 JP 4839329B2
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- 235000013305 food Nutrition 0.000 title claims description 49
- 238000004806 packaging method and process Methods 0.000 title claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 69
- 239000000835 fiber Substances 0.000 claims description 64
- 229920000728 polyester Polymers 0.000 claims description 43
- 239000005871 repellent Substances 0.000 claims description 41
- 230000002940 repellent Effects 0.000 claims description 39
- 239000003623 enhancer Substances 0.000 claims description 21
- 239000002994 raw material Substances 0.000 claims description 18
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 229920000962 poly(amidoamine) Polymers 0.000 claims description 5
- 239000000123 paper Substances 0.000 description 70
- 238000000576 coating method Methods 0.000 description 29
- 239000011248 coating agent Substances 0.000 description 25
- 239000003795 chemical substances by application Substances 0.000 description 21
- 238000004513 sizing Methods 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 12
- 229920001131 Pulp (paper) Polymers 0.000 description 8
- -1 polyethylene Polymers 0.000 description 8
- 229920000297 Rayon Polymers 0.000 description 7
- 239000000839 emulsion Substances 0.000 description 7
- 230000007935 neutral effect Effects 0.000 description 7
- 239000002964 rayon Substances 0.000 description 6
- 239000002655 kraft paper Substances 0.000 description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- 238000007756 gravure coating Methods 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- 239000011122 softwood Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 229920000877 Melamine resin Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 3
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- 229920000573 polyethylene Polymers 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
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- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 3
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- 239000004640 Melamine resin Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011087 paperboard Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
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- 238000009736 wetting Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
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- 239000002270 dispersing agent Substances 0.000 description 1
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- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- IVJISJACKSSFGE-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine Chemical compound O=C.NC1=NC(N)=NC(N)=N1 IVJISJACKSSFGE-UHFFFAOYSA-N 0.000 description 1
- 235000013611 frozen food Nutrition 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 235000015220 hamburgers Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000013054 paper strength agent Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
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- 229920003170 water-soluble synthetic polymer Polymers 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Landscapes
- Paper (AREA)
Description
本発明は、食品包装用シートに関し、特に低坪量の食品包装用シートに関する。 The present invention relates to a food packaging sheet, and particularly to a food packaging sheet having a low basis weight.
和紙調の風合いを有している食品包装用紙として、レーヨン繊維をバインダーとしてのポリビニルアルコール（PVA）とともに含むものが知られている。この食品包装用紙は、抄紙性が良好で、比較的安価であるため、多く使用されているが、耐水性を有していないので、水に濡れる危険性のある用途には使用できないという欠点があった。また、このような食品包装用紙にろう引き処理を行い、耐水性を付与したものは、光沢がでるとともに表面が平坦になり、和紙調の風合いを損ねてしまうという問題があった。 As a food packaging paper having a Japanese paper-like texture, one containing rayon fibers together with polyvinyl alcohol (PVA) as a binder is known. This food wrapping paper is widely used because it has good papermaking properties and is relatively inexpensive. However, it does not have water resistance, so it cannot be used for applications that risk getting wet. there were. In addition, such food wrapping paper that has been subjected to a brazing process and imparted water resistance has a problem that it is glossy and has a flat surface, which impairs the texture of Japanese paper.
そこで、レーヨン繊維をバインダーとしてのビスコース溶液に懸濁させて抄造し、その後酸処理することで、耐水性、及び水と接触した時に耐久性を有しかつ生分解性に優れた性質を有するレーヨン紙を得ることが提案されている（特許文献１参照）。 Therefore, by suspending the rayon fiber in a viscose solution as a binder and making paper, and then acid-treating it, it has water resistance and properties that are durable and biodegradable when contacted with water. It has been proposed to obtain rayon paper (see Patent Document 1).
また、抄紙用の熱接着繊維として特定のポリエーテルエステル共重合体繊維を用いてパルプと混抄することにより、ソフトで、耐水性のある紙を得る方法も提案されている（特許文献２参照）。 In addition, a method of obtaining a soft and water-resistant paper by mixing with pulp using a specific polyetherester copolymer fiber as a heat-bonding fiber for papermaking has been proposed (see Patent Document 2). .
さらに、木材パルプと化学繊維とサイズ剤、紙力増強剤を添加したヒートシール性及び撥水性を有する薄い柔軟紙も提案されている（特許文献３参照）。
しかしながら、和紙調で低坪量の包装紙を得るために、特許文献１〜３に記載の紙を低坪量で抄紙しても、撥水剤の塗工は難しかった。すなわち、撥水剤の塗工工程において撥水剤の塗液により紙が湿潤するために断紙しやすかったからである。さらに、特許文献１記載のレーヨン紙では、抄造後の酸処理とそれに伴って必要なその後の処理に工数が係るとともに、風合いなどの性質を損なわずに安定的に製造するのは難しく、コスト高になりかつ品質の安定化が困難であるという問題があった。 However, in order to obtain a Japanese paper-like, low basis weight wrapping paper, it was difficult to apply a water repellent even if the papers described in Patent Documents 1 to 3 were made at a low basis weight. That is, in the water repellent coating process, the paper is wetted by the water repellent coating solution, so that it is easy to break the paper. Furthermore, in the rayon paper described in Patent Document 1, man-hours are involved in the acid treatment after paper making and the subsequent treatment necessary for the paper making, and it is difficult to stably produce without sacrificing properties such as texture, resulting in high cost. And there is a problem that it is difficult to stabilize the quality.
そこで、本発明では、低坪量で抄紙し和紙調の風合いを有しながらも、断紙することなく撥水剤を塗布することを可能とし、表面と裏面とが高い撥水性を持つ食品包装用シートであって、簡便に製造することができる食品包装用シートを提供することを目的とする。 Therefore, in the present invention, it is possible to apply a water repellent without cutting the paper while making a paper with a low basis weight and having a Japanese paper-like texture, and a food packaging having a high water repellency on the front and back surfaces. An object of the present invention is to provide a food packaging sheet that can be easily manufactured.
上記目的を達成するために、本発明は、パルプとポリエステル繊維とを含む原料からなり、湿潤紙力増強剤が内添又は外添され、坪量が９〜３０ｇ／ｍ２の食品包装用シートであって、ＪＩＳ P ８１３５：１９９８に準拠した縦（抄紙機の流れ方向）の湿潤引張り強さが０．１〜０．６ｋＮ／ｍであり、ＪＩＳ Ｐ ８１３７：１９７６に準拠した表面と裏面の撥水度がＲ７〜Ｒ１０である。 In order to achieve the above object, the present invention is a food packaging sheet comprising a raw material containing pulp and polyester fiber, having a wet paper strength enhancer added internally or externally, and having a basis weight of 9 to 30 g / m 2. The longitudinal (paper machine flow direction) wet tensile strength according to JIS P 8135: 1998 is 0.1 to 0.6 kN / m, and the front and back surfaces according to JIS P 8137: 1976 The water repellency is R7 to R10.
前記ポリエステル繊維は、好ましくは、繊度が１．１〜２．２ｄｔｅｘ、繊維長が１〜８mm、前記原料中の含有量が５〜１５質量％である。また、前記湿潤紙力増強剤は、好ましくは、ポリアミドアミン・エピクロロヒドリン系の湿潤紙力増強剤である。 The polyester fiber preferably has a fineness of 1.1 to 2.2 dtex, a fiber length of 1 to 8 mm, and a content in the raw material of 5 to 15% by mass. The wet paper strength enhancer is preferably a polyamidoamine / epichlorohydrin-based wet paper strength enhancer.
前記ポリエステル繊維は、好ましくは未延伸のポリエステル繊維である。 The polyester fibers are preferably unstretched polyester fibers.
上記食品包装用シートは、好ましくは、パラフィン系の撥水剤を含浸させてなる。そして、前記撥水剤は、好ましくは、食品包装用シートの表面または裏面の一方に塗工される。すなわちこの構成によると、耐水性を持つポリエステル繊維を含有する原料スラリーを用い、湿潤紙力増強剤を内添又は外添し、縦の湿潤引張り強さが０．１〜０．６ｋＮ／ｍを有する紙としたので、この湿潤紙力を有する紙を用いることで、低坪量で抄紙した場合であっても、撥水剤を断紙することなくグラビア塗工などにより塗工することができ、好ましくはサイズ剤を添加しないことで、撥水剤を片面塗工した場合でも裏面にまで含浸させることができ、表面・裏面ともに撥水度がＲ７〜Ｒ１０の紙を安定して生産性良く得ることができる。かくして、ポリエステル繊維を含んだ和紙調の風合いを持ちながら、表面と裏面が耐湿性と撥水性をもった食品包装用シートを、高い抄紙性と生産性をもって低コストにて製造することができる。 The food packaging sheet is preferably impregnated with a paraffinic water repellent. The water repellent is preferably applied to one of the front and back surfaces of the food packaging sheet. That is, according to this configuration, a raw material slurry containing water-resistant polyester fiber is used, and a wet paper strength enhancer is internally or externally added, and the vertical wet tensile strength is 0.1 to 0.6 kN / m. By using paper with this wet paper strength, even when paper is made at a low basis weight, it can be applied by gravure coating etc. without breaking the water repellent. In addition, preferably by adding no sizing agent, even when a water repellent is applied on one side, it can be impregnated even on the back side, and paper with a water repellency of R7 to R10 on both the front and back sides is stable and highly productive. Obtainable. Thus, it is possible to produce a food packaging sheet having moisture resistance and water repellency on the front and back surfaces with high papermaking properties and productivity at a low cost while having a Japanese paper-like texture containing polyester fibers.
本発明の食品包装用シートは、和紙調の風合いを有しており、低坪量で抄紙されながらも、撥水剤の塗布を可能とし、表面・裏面ともに耐水性・撥水性を有する食品包装用シートを得ることができる。 The food packaging sheet of the present invention has a Japanese paper-like texture, enables water-repellent coating while being made with a low basis weight, and has water resistance and water repellency on both the front and back surfaces. Sheet can be obtained.
以下、本発明にかかる食品包装用シートについて、詳細に説明する。 Hereinafter, the food packaging sheet according to the present invention will be described in detail.
本発明は、パルプとポリエステル繊維とを含む原料からなり、湿潤紙力増強剤が内添又は外添され、坪量が９〜３０ｇ／ｍ２の食品包装用シートである。そして、ＪＩＳ P ８１３５：１９９８に準拠した縦の湿潤引張り強さが０．１〜０．６ｋＮ／ｍであり、ＪＩＳ Ｐ ８１３７：１９７６に準拠した表面と裏面の撥水度がＲ７〜Ｒ１０であり、さらに、和紙調の風合いを有する。 The present invention is a food packaging sheet comprising a raw material containing pulp and polyester fiber, having a wet paper strength enhancer added internally or externally, and having a basis weight of 9 to 30 g / m 2 . The vertical wet tensile strength according to JIS P 8135: 1998 is 0.1 to 0.6 kN / m, and the water repellency between the front and back surfaces according to JIS P 8137: 1976 is R7 to R10. Furthermore, it has a Japanese paper-like texture.
パルプとしては、針葉樹クラフトパルプ（ＮＫＰ）、針葉樹晒クラフトパルプ（ＮＢＫＰ）、針葉樹未晒パルプ（ＮＵＫＰ）、広葉樹クラフトパルプ（ＬＫＰ）、広葉樹晒クラフトパルプ（ＬＢＫＰ）、広葉樹未晒パルプ（LUKP）等の化学パルプ；サーモメカニカルパルプ（ＴＭＰ）、加圧ストーングランドパルプ（ＰＧＷ）等の機械パルプ；ディンギングパルプ（ＤＩＰ）、ウェストパルプ（ＷＰ）等の化学パルプや機械パルプ由来の古紙パルプ等を使用できるが、これらのパルプのうち、和紙調の風合いを得るのに、針葉樹晒クラフトパルプ（ＮＢＫＰ）を好適に用いることができる。また、パルプに限らず、ポリエチレン（ＰＥ）、ポリプロピレン（PP）、ポリエチレンテレフタレート（ＰＥＴ）などからなる合成繊維、レーヨン繊維などを適宜配合することもできる。 As pulp, softwood kraft pulp (NKP), softwood bleached kraft pulp (NBKP), softwood unbleached pulp (NUKP), hardwood kraft pulp (LKP), hardwood bleached kraft pulp (LBKP), hardwood unbleached pulp (LUKP), etc. Chemical pulp; mechanical pulp such as thermomechanical pulp (TMP) and pressed stone grand pulp (PGW); used chemical pulp such as Dinging Pulp (DIP) and West Pulp (WP) and used paper pulp derived from mechanical pulp Of these pulps, softwood bleached kraft pulp (NBKP) can be suitably used to obtain a Japanese paper-like texture. Moreover, not only pulp, but also synthetic fibers made of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), rayon fibers, and the like can be appropriately blended.
また、本発明においては、原料にポリエステル繊維を配合する。ポリエステル繊維は、原料としてパルプと一緒に配合されることにより、乾燥工程におけるドライヤーの加熱により、自身が有する熱融着性によって、パルプにポリエステル繊維が熱融着され、パルプと一体化するので、強度が高まる特徴を有する。 In the present invention, polyester fiber is blended in the raw material. The polyester fiber is blended together with the pulp as a raw material, and the polyester fiber is heat-fused to the pulp due to the heat-fusing property of the dryer by the heating of the dryer in the drying process. It has the feature of increasing strength.
またポリエステル繊維を配合させることにより、ポリエステル繊維の耐水性により、濡れに強く、撥水剤塗工時における断紙を軽減させることができる。 By blending polyester fibers, the polyester fibers are resistant to wetting due to the water resistance of the polyester fibers and can reduce paper breakage during water repellent coating.
また、本発明におけるポリエステル繊維としては、未延伸のポリエステル繊維を使用することが好ましい。未延伸のポリエステル繊維は、融点が220℃程度であるが、ヤンキードライヤーの110℃〜120℃くらいの温度であっても、繊維が軟化し熱融着することができる。このようにポリエステル繊維がパルプ繊維と融着することにより、所定の湿潤紙力強度を達成することができ、撥水剤の連続塗工に耐えられるだけの紙力を持たせることができるのである。一方、未延伸ではない主体ポリエステル繊維は、融点が260℃程度と高いため、ドライヤーの熱では繊維が軟化しにくく、熱融着しにくい。そのため、撥水剤の連続塗工に耐えられるだけの所定の湿潤引張り強さを達成できない問題がある。 Moreover, it is preferable to use unstretched polyester fiber as the polyester fiber in the present invention. The unstretched polyester fiber has a melting point of about 220 ° C., but the fiber can be softened and thermally fused even at a temperature of about 110 ° C. to 120 ° C. of a Yankee dryer. In this way, the polyester fiber is fused with the pulp fiber, so that a predetermined wet paper strength can be achieved, and a paper strength sufficient to withstand the continuous application of the water repellent can be provided. . On the other hand, since the main polyester fiber that is not unstretched has a high melting point of about 260 ° C., it is difficult for the fiber to soften and heat-seal with the heat of the dryer. Therefore, there is a problem that a predetermined wet tensile strength that can withstand continuous application of the water repellent cannot be achieved.
よって、本発明におけるポリエステルの融点は、良好な熱接着性を得ることができ、ヒートシールバーの汚れを防ぐために、融点が220℃〜265℃のものを使用することが好ましく、このような融点のポリエステルを用いることにより、ドライヤーの熱によりポリエステル繊維を軟化させ、パルプ繊維にポリエステル繊維を熱融着させることができ、紙の強度を維持し、耐水性を発揮することができるのである。 Therefore, the melting point of the polyester in the present invention is preferably such that a melting point of 220 ° C. to 265 ° C. is used in order to obtain good thermal adhesiveness and to prevent the heat seal bar from becoming dirty. By using this polyester, the polyester fiber can be softened by the heat of the dryer, the polyester fiber can be heat-sealed to the pulp fiber, the strength of the paper can be maintained, and the water resistance can be exhibited.
また、ポリエステル繊維としては、繊度が1.1〜2.2dtexのものを使用することが好ましく、さらに好ましくは1.5〜2.0dtexのものを使用することが好ましい。すなわち、繊度が1.1dtex未満であると、和紙調の風合いが損なわれる問題があり、繊度が2.2dtexを超える場合には、原料中に含まれるポリエステル繊維の数が限られてくるため、湿潤引張り強さが低下し、断紙等により撥水剤の塗布が困難となり、撥水剤の連続塗工性が低下する問題がある。また、ポリエステル繊維の繊維長は、１〜10mmのものを使用することが好ましく、さらに好ましくは、3〜8mmのものを使用することが好ましい。繊維長が、１ｍｍ未満であると、湿潤引張り強さが低下し、断紙等により撥水剤の塗布が困難となり、撥水剤の連続塗工性が低下する問題があり、繊維長が１０ｍｍを超えると、繊維がよじれて絡まってしまい、結束ができ、結果、和紙調の風合いが損なわれる問題がある。 Moreover, as a polyester fiber, it is preferable to use a thing with a fineness of 1.1-2.2 dtex, More preferably, it is preferable to use a 1.5-2.0 dtex thing. In other words, if the fineness is less than 1.1 dtex, there is a problem that the texture of Japanese paper is impaired, and if the fineness exceeds 2.2 dtex, the number of polyester fibers contained in the raw material is limited, so wet tensile There is a problem that the strength is lowered, it becomes difficult to apply the water repellent due to paper breakage or the like, and the continuous coatability of the water repellent is lowered. Further, the fiber length of the polyester fiber is preferably 1 to 10 mm, more preferably 3 to 8 mm. If the fiber length is less than 1 mm, the wet tensile strength decreases, and it becomes difficult to apply the water repellent due to paper breakage, etc., and the continuous coating property of the water repellent decreases, and the fiber length is 10 mm. If it exceeds 1, the fibers are kinked and entangled to form a bundle, resulting in a problem that the texture of Japanese paper is impaired.
また、ポリエステル繊維は、原料中、すなわちパルプとポリエステル繊維との合計質量に対して、５〜１５質量％の割合で配合されることが好ましい。５質量％未満であると、湿潤引張り強さが低下し、撥水剤の塗布が困難となり連続塗工性が低下する問題がある。また、１５質量％を超えると、和紙調の風合いが損なわれる問題がある。 Moreover, it is preferable that a polyester fiber is mix | blended in the raw material, ie, the ratio of 5-15 mass% with respect to the total mass of a pulp and a polyester fiber. When it is less than 5% by mass, there is a problem that wet tensile strength is lowered, application of a water repellent becomes difficult, and continuous coatability is lowered. Moreover, when it exceeds 15 mass%, there exists a problem by which the texture of a Japanese paper tone is impaired.
本発明の食品包装用シートは、坪量が９〜３０g/ｍ2と低坪量になるように抄紙する。すなわち、従来ならば、９〜３０g/ｍ2という低坪量で抄いた紙に、撥水剤を塗布することは、低坪量であるが故に、濡れに弱く断紙が発生し、連続塗工することが困難であったが、本発明においては、ポリエステル繊維を使用して所定の強度を有する構成とすることにより、坪量が９〜３０g/ｍ2と低坪量であっても、撥水剤の連続塗工を可能とし、表面・裏面における耐湿性・撥水性が良好な食品包装用シートの提供を可能とする。 The sheet for food packaging of the present invention is paper-made so that the basis weight is 9 to 30 g / m 2 and a low basis weight. That is, conventionally, applying a water repellent to paper made with a low basis weight of 9 to 30 g / m 2, because of its low basis weight, causes paper breakage due to low wettability, and continuous coating. Although it was difficult to work, in the present invention, by using a polyester fiber and having a predetermined strength, even if the basis weight is 9 to 30 g / m 2 and low basis weight, A water-repellent agent can be continuously applied to provide a food packaging sheet having good moisture resistance and water repellency on the front and back surfaces.
従って、本発明においては、坪量は９〜３０g/ｍ2という低坪量で抄くことが好ましく、さらに好ましくは、１４〜３０g/ｍ2で抄くことが好ましい。坪量が９g/ｍ2未満であると、十分な湿潤引張り強さが維持できなくなり、撥水剤の連続塗工が困難となる問題がある。また、坪量が３０g/ｍ2を超えると、撥水剤を片面塗工した場合には、撥水剤が裏面にまで含浸しにくく、裏面の撥水度が低下する問題がある。 Accordingly, in the present invention, the basis weight is preferably combing at low basis weight of 9~30g / m 2, more preferably, it is preferable that the disk in 14~30g / m 2. When the basis weight is less than 9 g / m 2 , there is a problem that sufficient wet tensile strength cannot be maintained and continuous coating of the water repellent becomes difficult. On the other hand, if the basis weight exceeds 30 g / m 2 , when the water repellent is applied on one side, the water repellent is difficult to impregnate to the back surface, and the water repellency of the back surface is lowered.
また、湿潤紙力増強剤としては、水溶性合成高分子のもの、メラミン樹脂系のもの、尿素系のもの、ポリアミドアミン・エピクロロヒドリン系のものなどを使用することができるが、本発明においては、中でもポリアミドアミン・エピクロロヒドリン系のものを使用することが好ましい。すなわち、メラミン樹脂系のものは、人体に影響を与えるホルムアルデヒド発生の恐れがあり、尿素系のものは、刺激臭により食品包装用途には適さない問題がある。一方、ポリアミドアミン・エピクロロヒドリン系の樹脂は、自己定着能力を有しており、酸性から中性領域で紙力増強効果を発揮することができる。また、熱架橋性を有しているため、熱に不溶な網目構造を取ることができ、湿潤強度をさらにあげることができるため、好ましく用いることができる。 In addition, as the wet paper strength enhancer, water-soluble synthetic polymers, melamine resin-based, urea-based, polyamidoamine / epichlorohydrin-based ones can be used. In particular, it is preferable to use a polyamidoamine / epichlorohydrin type. That is, the melamine resin type may cause formaldehyde that affects the human body, and the urea type has a problem that it is not suitable for food packaging due to an irritating odor. On the other hand, polyamidoamine / epichlorohydrin-based resins have a self-fixing ability and can exert a paper strength enhancing effect in an acidic to neutral range. Further, since it has thermal crosslinkability, it can take a network structure insoluble in heat and can further increase the wet strength, so that it can be preferably used.
また、本発明において湿潤紙力増強剤は、固形分換算で、原料１００質量部に対して０．１５〜１．２質量部配合されることが好ましい。０．１５質量部未満となると、十分な湿潤引張り強さを維持できず、撥水剤の連続塗工が困難となる問題がある。また、１．２質量部を超えると、ＪＩＳ Ｐ ８１１６に準拠した紙の縦の引裂強度が低下する問題がある。本発明の食品包装用シートにおいては、ＪＩＳ P ８１３５：１９９８に準拠した縦の湿潤引張り強さが０．１〜０．６ｋＮ／ｍであり、横（抄紙機の幅方向）の湿潤引張り強さが、０．０２〜０．３０ｋN／ｍである。 In the present invention, the wet paper strength enhancer is preferably blended in an amount of 0.15 to 1.2 parts by mass with respect to 100 parts by mass of the raw material in terms of solid content. When the amount is less than 0.15 parts by mass, sufficient wet tensile strength cannot be maintained, and there is a problem that continuous coating of the water repellent becomes difficult. Moreover, when it exceeds 1.2 mass parts, there exists a problem that the vertical tear strength of the paper based on JISP8116 falls. In the food packaging sheet of the present invention, the vertical wet tensile strength according to JIS P 8135: 1998 is 0.1 to 0.6 kN / m, and the horizontal (paper machine width direction) wet tensile strength. Is 0.02 to 0.30 kN / m.
さらに本発明において湿潤紙力増強剤は、内添または外添により添加することができるが、より好ましくは内添することが好ましい。外添塗工によると、湿潤紙力増強剤の効果が完全に発生するまでに数日要するのに加え、断紙の発生する恐れがあり、また、原紙に対し塗工回数が増えることになる。 Further, in the present invention, the wet paper strength enhancer can be added by internal or external addition, but it is more preferable to add it internally. According to the external coating, it takes several days until the effect of the wet paper strength enhancer completely occurs, and there is a risk of paper breakage, and the number of coatings on the base paper increases. .
撥水剤としては、パラフィン系ワックスエマルジョン、ポリエチレン系ワックスエマルジョン等のワックス系エマルジョンを使用することが好ましい。すなわち、パラフィン系ワックスエマルジョンは、中性で無味無臭であり、食品包装用途に適している。また、防湿・防水に優れている点で好ましく使用することができる。また、フッ素系樹脂、シリコーン、ポリビニルアルコール、アクリル系樹脂、スチレン・アクリル系樹脂、スチレン・ブタジエン系樹脂、酢酸ビニル系樹脂等も使用することが可能であり、これらとワックス系エマルジョンを併用してもよい。すなわち、本発明においては、所定のポリエステル繊維を使用して所定の強度を有する構成とすることにより、坪量が９〜３０g/ｍ2と低坪量であっても、撥水剤の連続塗工を可能としたため、包装用紙の用途に応じて、撥水剤の種類、撥水強度は適宜変更できるようになったわけである。 As the water repellent, it is preferable to use a wax emulsion such as a paraffin wax emulsion or a polyethylene wax emulsion. That is, the paraffin wax emulsion is neutral and tasteless and odorless and is suitable for food packaging applications. Further, it can be preferably used because it is excellent in moisture proofing and waterproofing. Fluorine resin, silicone, polyvinyl alcohol, acrylic resin, styrene / acrylic resin, styrene / butadiene resin, vinyl acetate resin, etc. can also be used. Also good. In other words, in the present invention, by using a predetermined polyester fiber and having a predetermined strength, even if the basis weight is 9 to 30 g / m 2 and the basis weight is low, the water repellent is continuously applied. Since the work can be performed, the type of water repellent and the water repellent strength can be appropriately changed according to the use of the packaging paper.
また、撥水剤の塗布量は、固形分換算で、０．５〜１０g/ｍ2塗布することが好ましく、さらに好ましくは、５〜１０g/ｍ2塗布することが好ましい。塗布量が、０．５g/ｍ2未満となると、表面・裏面とも撥水度が低下する問題があり、塗布量が１０g/ｍ2を超えると、過剰塗工となり、濡れによる断紙により連続塗工性が低下する問題がある。本発明の食品包装用シートにおいては、ＪＩＳ Ｐ ８１３７：１９７６に準拠した表面と裏面の撥水度がＲ７〜Ｒ１０となるようにする。 Further, the coating amount of the water repellent is preferably 0.5 to 10 g / m 2 , more preferably 5 to 10 g / m 2 in terms of solid content. When the coating amount is less than 0.5 g / m 2 , there is a problem that the water repellency decreases on both the front and back surfaces. When the coating amount exceeds 10 g / m 2 , overcoating occurs and continuous due to paper cutting due to wetting. There is a problem that coatability deteriorates. In the food packaging sheet of the present invention, the water repellency of the front and back surfaces in accordance with JIS P 8137: 1976 is set to R7 to R10.
また、撥水剤の塗工方法としては、ロール、エアーナイフ、ブレード塗工等の各種の塗工方法を適用できるが、本発明においては、低坪量でありながらも、ポリエステル繊維を混抄し、熱によるパルプとの融着、さらに湿潤紙力増強剤の添加により、耐水性を向上させているため、ロール塗工の中でも、特にグラビア塗工を適用することができる。グラビア塗工によれば、塗液の濃度、粘度のほか、グラビアロールのセルの深さとメッシュを調整することによって、塗工量の調整を容易に行え、また均一に塗工を行うことができる点で好ましい。 In addition, as a method for coating the water repellent, various coating methods such as roll, air knife, blade coating and the like can be applied, but in the present invention, polyester fiber is mixed and mixed while having a low basis weight. Since water resistance is improved by fusion with pulp by heat and addition of a wet paper strength enhancer, gravure coating can be applied particularly among roll coating. According to gravure coating, the coating amount can be adjusted easily and uniformly by adjusting the cell depth and mesh of the gravure roll in addition to the concentration and viscosity of the coating liquid. This is preferable.
また、本発明においては、表面の耐水性をあげるために、サイズ剤を添加してもよい。サイズ剤としては特に限定されないが、例えば、酸性サイズ剤（溶液ロジンサイズ剤、合成サイズ剤、酸性ロジンエマルションサイズ剤、弱酸性エマルションサイズ剤等）、中性サイズ剤（アルキルケテンダイマー（ＡＫＤ）サイズ剤、アルケニル無水コハク酸（ＡＳＡ）サイズ剤、中性ロジンエマルションサイズ剤、ポリマー系サイズ剤、溶液型サイズ剤等）等が挙げられる。食品包装用シートは、商品の陳列時において、蛍光灯のような光に長時間曝されていることが多いため、退色耐性、経時劣化耐性のある中性抄紙することが好ましい。従って、ｐＨ７付近でサイズ効果の出易い中性サイズ剤を使用することが好ましい。 In the present invention, a sizing agent may be added to increase the water resistance of the surface. Although it does not specifically limit as sizing agent, For example, acidic sizing agent (solution rosin sizing agent, synthetic sizing agent, acidic rosin emulsion sizing agent, weak acidic emulsion sizing agent, etc.), neutral sizing agent (alkyl ketene dimer (AKD) size) Agents, alkenyl succinic anhydride (ASA) sizing agent, neutral rosin emulsion sizing agent, polymer sizing agent, solution type sizing agent and the like). Since food packaging sheets are often exposed to light such as fluorescent lamps for a long time when products are displayed, it is preferable to make neutral papers that are resistant to fading and deterioration over time. Therefore, it is preferable to use a neutral sizing agent that easily produces a size effect in the vicinity of pH 7.
しかしながら、本発明においては、表面・裏面両面において撥水度の効果をあげるため、サイズ剤を添加しない方がより好ましい。すなわちサイズ剤を添加した場合には、サイズ効果により、撥水剤を片面塗工した場合、撥水剤が中まで含浸されず、表面に留まるため、表面の撥水度はあがるが、裏面の撥水度をあげることはできない。サイズ剤を添加しない場合、一回片面塗工することで、表面のみならず裏面にまで撥水剤が含浸され、裏面においても撥水性の効果をあげることができる。 However, in the present invention, it is more preferable not to add a sizing agent in order to increase the water repellency on both the front and back surfaces. That is, when a sizing agent is added, due to the size effect, when the water repellent is applied on one side, the water repellant is not impregnated to the inside and stays on the surface. The water repellency cannot be increased. When the sizing agent is not added, the single-side coating is performed once so that the water repellent is impregnated not only on the surface but also on the back surface, and the water repellent effect can be obtained on the back surface.
なお、原紙中には上記以外にも、分散剤、紙力剤、消泡剤等、必要に応じて添加することができる。 In addition to the above, a dispersant, a paper strength agent, an antifoaming agent, and the like can be added to the base paper as necessary.
また本発明における食品包装用シートの製造方法としては、円網抄紙機、長網抄紙機、短網抄紙機、ツインワイヤー抄紙機等、使用することができるが、円網抄紙機は、地合の均一性を確保できるので低坪量の抄紙に適しており、また縦の紙力強度を高めることができる点で好ましい。 In addition, as a method for producing a food packaging sheet in the present invention, a circular net paper machine, a long net paper machine, a short net paper machine, a twin wire paper machine, etc. can be used. Can be ensured, so that it is suitable for papermaking with a low basis weight and is preferred in that the vertical paper strength can be increased.
以下に、実施例に基づいて本発明をより詳細に説明するが、本発明はこれらの実施例に限定されるものではない。
１．実施例、比較例の食品包装用シートの製造
（実施例１）
原料配合を、NBKPが９５質量％、ポリエステル繊維（未延伸ポリエステル繊維、繊度1.2dtex、繊維長5mm、商品名：ＴＡ０７N、帝人ファイバー社製、）が５質量％とし、湿潤紙力増強剤としてポリアミドアミン・エピクロロヒドリン系の湿潤紙力増強剤（商品名：WS４０２４、星光PMC社製）を、固形分換算で原料１００重量部に対して０．６０質量部添加し、坪量１７g/ｍ2となるように抄造した。ついで、その紙をグラビア塗工機に通し、パラフィンワックス（商品名：オートサイザーKS、大和化学製）を固形分換算で原料１００質量部に対して０．８０質量部塗布し、乾燥して食品包装用シートとした。
Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.
1. Production of Food Packaging Sheets of Examples and Comparative Examples (Example 1)
NBKP is 95% by mass, polyester fiber (unstretched polyester fiber, fineness 1.2dtex, fiber length 5mm, product name: TA07N, manufactured by Teijin Fibers Ltd.) is 5% by mass, and polyamide as a wet paper strength enhancer An amine / epichlorohydrin-based wet paper strength enhancer (trade name: WS4024, manufactured by Seiko PMC) is added in an amount of 0.60 parts by mass in terms of solid content to 100 parts by weight of the raw material, and the basis weight is 17 g / m. Paper was made to be 2 . Next, the paper is passed through a gravure coating machine, and paraffin wax (trade name: Autosizer KS, manufactured by Yamato Chemical Co., Ltd.) is applied in an amount of 0.80 parts by mass in terms of solid content to 100 parts by mass of the raw material. A packaging sheet was obtained.
（比較例５）
ポリエステル繊維（主体ポリエステル繊維、繊度1.2dtex、繊維長5mm、商品名：ＴＴ０４N、帝人ファイバー社製）の種類を変化させた以外は、実施例１と同様にして食品包装用シートを得た。
( Comparative Example 5 )
A food packaging sheet was obtained in the same manner as in Example 1 except that the type of the polyester fiber (main polyester fiber, fineness 1.2 dtex, fiber length 5 mm, trade name: TT04N, manufactured by Teijin Fibers Ltd.) was changed.
（実施例４〜７、比較例６〜７）
ポリエステル繊維の配合量を変化させ、その変化量分NBKPを増減させた以外は、実施例１と同様にして食品包装用シートを得た。
( Examples 4-7, Comparative Examples 6-7 )
A food packaging sheet was obtained in the same manner as in Example 1 except that the amount of polyester fiber was changed and NBKP was increased or decreased by the amount of change.
（実施例１０〜１４、比較例８〜９）
ポリエステル繊維の繊度を変化させた以外は、実施例１と同様にして食品包装用シートを得た。
(Examples 10-14, Comparative Examples 8-9 )
A food packaging sheet was obtained in the same manner as in Example 1 except that the fineness of the polyester fiber was changed.
（実施例１７〜２０、比較例１０〜１１）
ポリエステル繊維の繊維長を変化させた以外は、実施例１と同様にして食品包装用シートを得た。
(Examples 17-20, Comparative Examples 10-11 )
A food packaging sheet was obtained in the same manner as in Example 1 except that the fiber length of the polyester fiber was changed.
（実施例２２〜２６）
坪量を変化させた以外は、実施例１と同様にして食品包装用シートを得た。
(Examples 22 to 26)
A food packaging sheet was obtained in the same manner as in Example 1 except that the basis weight was changed.
（比較例１２）
湿潤紙力増強剤を変えて、メラミン−ホルムアルデヒド系の湿潤紙力増強剤（商品名：スミレ−ズレジンAC８％、田岡化学工業社製）を用いた点以外は、実施例１と同様にして食品包装用シートを得た。
( Comparative Example 12 )
The food was the same as in Example 1 except that the wet paper strength enhancer was changed and a melamine-formaldehyde wet paper strength enhancer (trade name: Sumire Resin AC 8%, manufactured by Taoka Chemical Co., Ltd.) was used. A packaging sheet was obtained.
（実施例２８）
湿潤紙力増強剤を内添ではなく外添した以外は、実施例１と同様にして食品包装用シートを得た。
(Example 28)
A food packaging sheet was obtained in the same manner as in Example 1 except that the wet paper strength enhancer was added externally instead of internally.
（実施例２９〜３５、比較例１３）
湿潤紙力増強剤の添加量を変えた以外は、実施例１と同様にして食品包装用シートを得た。
(Examples 29 to 35, Comparative Example 13 )
A food packaging sheet was obtained in the same manner as in Example 1 except that the addition amount of the wet paper strength enhancer was changed.
（実施例３７〜４２）
撥水剤の塗布量を変えた以外は、実施例１と同様にして食品包装用シートを得た。
(Examples 37 to 42)
A food packaging sheet was obtained in the same manner as in Example 1 except that the application amount of the water repellent was changed.
（実施例４３）
撥水剤の塗工方法を、ブレード塗工に変えた以外は、実施例１と同様にして食品包装用シートを得た。
(Example 43)
A food packaging sheet was obtained in the same manner as in Example 1 except that the water repellent coating method was changed to blade coating.
（実施例４４）
原料に、さらに、中性サイズ剤（商品名：AD１６０２、星光PMC社製）を固形分換算で原料１００質量部に対して２０質量部添加して抄造した以外は、実施例１と同様にして食品包装用シートを得た。
(Example 44)
The same procedure as in Example 1 was conducted except that the neutral sizing agent (trade name: AD1602, manufactured by Seiko PMC) was added to the raw material to make 20 parts by mass with respect to 100 parts by mass of the raw material. A food packaging sheet was obtained.
（比較例１）
ポリエステル繊維に変えて、レーヨン繊維（商品名：ホープ、オーミケンシ社製）を原料中４５質量部配合し、５０質量部としてNBKPを配合し、バインダーとしてポリビニルアルコール繊維（商品名：ビニロンバインダーSML、ユニチカ社製）を５質量部加えた点以外は、実施例１と同様にして食品包装用シートを得た。
(Comparative Example 1)
Instead of polyester fiber, 45 parts by mass of rayon fiber (trade name: Hope, manufactured by Ohmi Kenshi) is blended in the raw material, NBKP is blended as 50 parts by mass, and polyvinyl alcohol fiber (trade name: Vinylon Binder SML, Unitika) is used as a binder. A food packaging sheet was obtained in the same manner as in Example 1 except that 5 parts by mass) were added.
（比較例２）
ポリエステル繊維を配合せずに、実施例１と同様にして食品包装用シートを得た。
(Comparative Example 2)
A food packaging sheet was obtained in the same manner as in Example 1 without blending the polyester fiber.
（比較例３、４）
坪量を変えた以外は、実施例１と同様にして食品包装用シートを得た。
２．実施例、比較例の食品包装用シートの評価
以上の各実施例及び各比較例の食品包装用シートについて、湿潤引張り強さ、表面・裏面の撥水度を測定した。また、各食品包装用シートについて、撥水剤の連続塗工性と和紙調の風合いについて評価した。
(Comparative Examples 3 and 4)
A food packaging sheet was obtained in the same manner as in Example 1 except that the basis weight was changed.
2. Example for food packaging sheet of Examples and Comparative Examples above evaluation of food packaging sheet of Comparative Example, the wet tensile strength was measured water repellency of the front and back sides. Moreover, about each food packaging sheet, the continuous coating property of the water repellent and the texture of Japanese paper were evaluated.
（湿潤引張り強さ）
JIS P 8135：1998「紙及び板紙の湿潤引張強さ試験方法」に準拠して測定した。
(Wet tensile strength)
Measured according to JIS P 8135: 1998 “Test method for wet tensile strength of paper and paperboard”.
（撥水度）
JIS P 8137：1976「紙及び板紙のはっ水度試験方法」に準拠して測定した。
(Water repellency)
Measured according to JIS P 8137: 1976 “Testing method for water repellency of paper and paperboard”.
（連続塗工性）
撥水剤を塗工したときの塗工性を、次の４段階で評価した。
◎：問題なく、連続塗工できた。
○：やや波打ちの傾向があったが、連続塗工できた。
△：波打ちが多発して、連続塗工が困難であった。
×：撥水剤塗工直後に、断紙して塗工ができなかった。
(Continuous coating property)
The coatability when the water repellent was applied was evaluated in the following four stages.
A: Continuous coating was possible without problems.
○: Although there was a tendency of undulation, continuous coating was possible.
(Triangle | delta): The wavy occurred frequently and continuous coating was difficult.
X: Immediately after water repellent coating, the paper was cut and coating was not possible.
（和紙調の風合い）
風合いについては、和紙調の風合いを有するかどうかを１０名に目視により次の４段階で評価させ、多数評価をそのサンプルの評価とした。
◎：和紙調の風合いを有する。
○：和紙調の風合いが若干劣る。
△：和紙調の風合いに多少劣る。
×：和紙調の風合いを有さない。
(Japanese paper-like texture)
Regarding the texture, 10 people were visually evaluated in the following four stages whether or not they had a Japanese paper-like texture, and the majority evaluation was made to evaluate the sample.
A: Japanese paper-like texture.
○: Washi-like texture is slightly inferior.
Δ: Slightly inferior to the texture of Japanese paper.
X: There is no Japanese paper-like texture.
本発明の食品包装用シートは、耐水性を有するので水分が経時的に蒸発する食品、例えば冷蔵・冷凍食品、ごはん、各種揚げ物、焼き魚、ハンバーガー、まんじゅう等の食品の包装用に有用である。 The food packaging sheet of the present invention has water resistance and is useful for packaging foods such as refrigerated / frozen foods, rice, various fried foods, grilled fish, hamburgers, and manjus, etc., whose moisture evaporates with time.
Claims (4)
前記ポリエステル繊維は未延伸のポリエステル繊維であり、
前記ポリエステル繊維は、融点が２２０〜２６５℃、繊度が１．０〜２．２ｄｔｅｘ、繊維長が１〜１０ｍｍ、前記原料中の含有量が５〜１５質量％であり、
前記湿潤紙力増強剤がポリアミドアミン・エピクロロヒドリン系の湿潤紙力増強剤であり、
前記湿潤紙力増強剤が前記原料１００質量部に対して０．１〜１．２質量部含有され、
ＪＩＳ Ｐ ８１３５：１９９８に準拠した縦の湿潤引張り強さが０．１〜０．６ｋＮ／ｍであり、
ＪＩＳ Ｐ ８１３７：１９７６に準拠した表面と裏面の撥水度がＲ７〜Ｒ１０である、食品包装用シート。 It is a food packaging sheet comprising a raw material containing pulp and polyester fiber, internally or externally added with a wet paper strength enhancer, impregnated or coated with a water repellent, and has a basis weight of 9 to 30 g / m 2. And
The polyester fiber is an unstretched polyester fiber,
The polyester fiber has a melting point of 220 to 265 ° C., a fineness of 1.0 to 2.2 dtex, a fiber length of 1 to 10 mm, and a content in the raw material of 5 to 15% by mass,
The wet paper strength enhancer is a polyamidoamine / epichlorohydrin based wet paper strength enhancer,
The wet paper strength enhancer is contained in an amount of 0.1 to 1.2 parts by mass with respect to 100 parts by mass of the raw material,
The vertical wet tensile strength according to JIS P 8135: 1998 is 0.1 to 0.6 kN / m,
A food packaging sheet having a water repellency of R7 to R10 according to JIS P 8137: 1976.
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| JPS63159599A (en) * | 1986-12-23 | 1988-07-02 | 株式会社クラレ | Thin paper for tea bag |
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| JP3385105B2 (en) * | 1994-07-19 | 2003-03-10 | 大王製紙株式会社 | Manufacturing method of fruit packaging sheet |
| JPH08134790A (en) * | 1994-11-08 | 1996-05-28 | Mitsubishi Paper Mills Ltd | Raw paper for lightweight coated paper |
| JP3577362B2 (en) * | 1995-06-12 | 2004-10-13 | 帝人ファイバー株式会社 | Thermal adhesive fiber and paper for papermaking |
| JP2005281876A (en) * | 2004-03-29 | 2005-10-13 | Daio Paper Corp | Base paper for impregnation |
| JP2006161180A (en) * | 2004-12-02 | 2006-06-22 | Daio Paper Corp | Moisture-proof/water-repellent food packaging paper |
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