JP3769263B2 - Moisture-proof paper - Google Patents
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- JP3769263B2 JP3769263B2 JP2003022133A JP2003022133A JP3769263B2 JP 3769263 B2 JP3769263 B2 JP 3769263B2 JP 2003022133 A JP2003022133 A JP 2003022133A JP 2003022133 A JP2003022133 A JP 2003022133A JP 3769263 B2 JP3769263 B2 JP 3769263B2
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Description
【０００１】
【発明の属する技術分野】
本発明はコピー用紙（ＰＰＣ用紙）等の紙を包装するのに好適な防湿加工紙に関する。
【０００２】
【従来の技術とその問題点】
コピー用紙等の包装に用いられる防湿加工紙には原紙たるクラフト紙にポリエチレン等の高分子化合物を塗工あるいは貼り合わせて防湿層を形成したものがあり、この防湿層によって充分な防湿性を得ることができるが、古紙を再生しようとすると防湿層の高分子化合物が離解せずに残るので、再生紙として用いることができない。
【０００３】
再生可能な防湿加工紙としては、原紙たるクラフト紙の片面または両面にパラフィンワックスを含むエマルジョンを塗工したり、あるいは合成ゴム系ラテックスとワックス系エマルジョンを混合した塗工液を塗工して防湿層を形成したものがあり、ワックス成分によって充分な防湿性を得ているが、これらの防湿加工紙を例えばコピー用紙の包装紙として使用すると、防湿層がコピー用紙に直接触れて、防湿層に含まれるワックス成分がコピー用紙に転移し、その結果コピー用紙表面の摩擦係数が小となってコピー機での紙送りの際に複数枚のコピー用紙が重ね送りされることがあった。
【０００４】
また、従来の防湿加工紙は前記ワックス成分によって表面の摩擦係数が小であることから、例えばロール状に巻取った紙を従来の防湿加工紙で包装すると、輸送時にロール状の巻取り紙と防湿加工紙との間にすべりが生じ、包装紙たる防湿加工紙がずれて体裁が悪くなったり、あるいは防湿加工紙が破れて巻取り紙が抜け落ちたりすることがあった。
【０００５】
【本発明の目的】
本発明の目的とするところは、充分な防湿性を有するとともに、古紙等を再生紙化することができ、しかも表面の摩擦係数が従来のものに比べて充分に大でコピー用紙等の紙の包装に好適な防湿加工紙を提供することにある。
【０００６】
【課題を解決するための手段】
上記目的を達成するために、本発明に係る防湿加工紙は、合成樹脂ラテックスたるスチレンブタジエンラテックスよりなる主材１００重量部に対して融点が４５〜６５℃である低融点ワックスを１０〜５０重量部添加してなる防湿剤１００重量部に対して水酸化アルミニウム細粉を２〜３０重量部添加した塗工液を原紙の少なくとも片面に塗工して防湿層を形成し、前記水酸化アルミニウム細粉の粒径を前記防湿層の厚さよりも大なるものとして、水酸化アルミニウム細粉の粒子の一部を防湿層の表面に突出せしめて表面の摩擦係数が防湿層のワックス成分によって小となるのが防止されるように構成したものとしてある。
【０００７】
また、前記防湿層の厚さが２０μｍ以下であり、しかも水酸化アルミニウム細粉は粒径が１０〜５０μｍの範囲内であって、防湿層の厚さよりも大である構成のものとしてある。
【０００８】
【実施例】
以下本発明の実施例を説明する。
本実施例の防湿加工紙は、防湿剤１００重量部に対して水酸化アルミニウム細粉を２〜３０重量部添加した塗工液を原紙たるクラフト紙の表面に塗工して防湿層を形成し、前記水酸化アルミニウム細粉の粒径を前記防湿層の厚さよりも大なるものとして、水酸化アルミニウム細粉の粒子の一部を防湿層の表面に突出せしめたものとしてあり、前記防湿剤は合成樹脂ラテックスたるスチレンブタジエンラテックス（ＳＢＲ）１００重量部に対して低融点ワックス（融点４５〜６５℃）を１０〜５０重量部添加したものとしてある。
【０００９】
前記低融点ワックスの添加量をスチレンブタジエンラテックス１００重量部に対して１０〜５０重量部とするのは、低融点ワックスの添加量が１０重量部よりも小であると防湿性が低下し、５０重量部よりも大であると防湿加工紙表面の摩擦係数が極端に小となり、また、離解すると低融点ワックスを成分とする粘着性異物により発泡して再生紙の製造に不都合が生じたり、同粘着性異物により再生紙の商品価値が低下し、さらには再生紙を加熱すると部分的に透明化することが あるからである。
【００１０】
また、前記防湿層の厚さは２０μｍ以下とし、しかも水酸化アルミニウム細粉は粒径が１０〜５０μｍの範囲内であって、防湿層の厚さよりも大なるものとしてある。
【００１１】
前記防湿層の厚さを２０μｍ以下とするのは、防湿層が厚過ぎると塗工作業が煩雑であるとともに、防湿加工紙に折目などを付した場合に折目部分の防湿層が損傷して防湿性が低下するおそれがあるからである。
【００１２】
また、前記水酸化アルミニウム細粉の粒径を１０〜５０μｍとするのは、同粒径が１０μｍよりも小であると、表面の摩擦係数が小となるとともに、ワックス成分の転移も防止することができなくなり、一方、水酸化アルミニウム細粉の粒径が５０μｍよりも大であると防湿加工紙の表面の平滑性が悪化して商品価値が著しく低下するとともに防湿性が低下するからである。
【００１３】
さらに、水酸化アルミニウム細粉の添加量を防湿剤１００重量部に対して２〜３０重量部とするのは、水酸化アルミニウム細粉の添加量が２重量部よりも小であると、表面の摩擦係数が小となるとともに、ワックス成分の転移も防止することができなくなり、また添加量が５０重量部よりも大であると防湿性が低下するからである。
【００１４】
本実施例に係る防湿加工紙の具体的な製造方法は次ぎのとおりである。
スチレンブタジエンラテックスとしてのジェイエスアール ( 株 ) 製の商品名ＡＥ８７２、１００重量部に対して、低融点ワックスとして中京油脂 ( 株 ) 製の商品名セロゾール４２８（低融点ワックスエマルジョン）を３０重量部添加した防湿剤を使用し、実施例１と同様に防湿剤１００重量部に対して水酸化アルミニウム細粉として日本軽金属 ( 株 ) 製の商品名Ｂ−３０３（粒子径３０μｍの水酸化アルミニウム細粉）を１６重量部添加し、原紙たる両更クラフト紙７０ｇ／ｍ 2 に２５ ｇ／ｍ 2 ドライ塗工し、乾燥する。
【００１５】
上述のように構成した防湿加工紙は、図１に示すように原紙１の表面に２０μｍよりも若干薄い防湿層２が形成され、防湿剤に添加された水酸化アルミニウム細粉の粒子３（直径約３０μｍ）の一部（上部）が防湿層２の表面から突出する。
【００１６】
本実施例の防湿加工紙をコピー用紙４等の包装紙として使用すると、防湿層２により充分な防湿性が得られ、また、水酸化アルミニウム細粉の粒子３が防湿層２の表面よりも上方へ突出しているので、コピー用紙４は水酸化アルミニウム細粉の粒子３に接触するが、防湿層２には殆ど接触しない。
【００１７】
したがって、防湿加工紙表面の摩擦係数は防湿剤中のワックス成分によって小となることはなく、しかもコピー用紙４等の被包装紙へのワックス成分の転移も防止される。
【００１８】
上記実施例で得られた防湿加工紙のサンプルについて透湿度、動摩擦係数、離解性およびコピー適性について評価試験を行った。
この評価試験を行うにあたり、次ぎの比較例１〜３で得られた防湿加工紙のサンプルについても同様の評価試験を行った。
【００１９】
＜比較例１＞
原紙たる両更クラフト紙７０ｇ／ｍ2 に、厚さ２０μｍのポリエチレン樹脂を押し出しラミネートした。
【００２０】
＜比較例２＞
防湿剤としての大日本インキ化学工業(株)製の商品名パテラコールＳＷ−１０、１００重量部に対して、本発明における水酸化アルミニウム細粉に代えて白石カルシウム(株)製の沈降性炭酸カルシウムＰＣ（粒子径４μｍ）を１６重量部添加し、原紙たる両更クラフト紙７０ｇ／ｍ2 に２５ｇ／ｍ2 ドライ塗工し、乾燥した。
【００２１】
＜比較例３＞
スチレンブタジエンラテックスとしてのジェイエスアール(株)製ＳＢＲラテックスＡＥ８７２と、低融点ワックスとしての中京油脂(株)製の商品名セロゾール４２８とを７：３の割合で混合した液を、原紙たる両更クラフト紙７０ｇ／ｍ2 に２５ｇ／ｍ2 ドライ塗工し、乾燥した。
【００２２】
＜試験方法＞
透湿度については、ＪＩＳ−Ｚ−２０８０に準拠して測定した。透湿度の値は５０ｇ／ｍ2・２４ｈｒ以下であれば充分な防湿性を有するものと評価することができる。
【００２３】
動摩擦係数については、サンプルの塗工層面とコピー用紙間についてＪＩＳ−Ｐ−８１４７水平法に基づいて試験を行った。動摩擦係数が０．４０以上であればコピー用紙の包装紙として使用した場合に滑りによる包装紙のずれなどが生じにくくなると評価することができる。
【００２４】
離解性については、ＪＩＳ−Ｐ−８２０９に準拠した標準離解機を使用し、１ｃｍ角に切った試料を冷水で２０分間離解して未離解物の有無を目視し、未離解物を含む場合には不良、未離解物を含まない場合には良好とした。
【００２５】
コピー適性については、５００枚／冊となるようコピー用紙をサンプルにて予め包装しておき、同コピー用紙を(株)リコー製のＰＰＣコピー機ＦＴ−７０００にセットし、重ね送りされたコピー用紙の枚数を調べた。
【００２６】
＜評価結果＞
図２に示す表のように、本発明の実施例で得られた防湿加工紙は、ともに透湿度、動摩擦係数および離解性において充分な実用性があると評価できる結果となり、またコピー適性においても冊間、冊内ともに重ね送りが発生しなかったことがわかる。
【００２７】
【発明の作用、効果】
本発明に係る防湿加工紙においては、防湿剤に添加された水酸化アルミニウム細粉の粒子が防湿層から表面に突出しているので、例えばコピー用紙の包装紙として使用した場合には、コピー用紙は水酸化アルミニウムの粒子とは接触するが、ワックス成分を含む防湿層とは殆ど接触しない。
【００２８】
したがって、ワックス成分によって防湿加工紙表面の摩擦係数が小となるのが防止され、被包装紙たるコピー用紙の輸送時においてはコピー用紙との間のすべりが生じにくく、従来の防湿加工紙のようにすべりによって包装紙たる防湿加工紙がずれたり、破れたりというおそれを軽減することができる。
【００２９】
また、上述のようにワックス成分を含む防湿層と被包装紙たるコピー用紙との接触が防止されるので、コピー用紙へのワックス成分の転移は殆どなく、コピー機での紙送りの際にコピー用紙が重ね送りされるなどのトラブルが生じにくい。
【００３０】
さらに、防湿層内に水酸化アルミニウム細粉を含有しているので、ワックス成分が防湿層の表面に現れる従来の防湿加工紙に比べて表面の光沢が抑えられ、普通紙に近い表面状態の防湿加工紙とすることができる。
また、本発明に係る防湿加工紙は離解性を有しているので、古紙等を回収して再生紙化することができる。
【００３１】
しかも、スチレンブタジエンラテックスよりなる主材１００重量部に対する低融点ワックスの添加量を１０〜５０重量部としてあるので、低融点ワックスの添加量が１０重量部よりも小である場合に生じる防湿性の低下が防止され、また同添加量が５０重量部よりも大である場合に生じる離解の際の低融点ワックスを成 分とする粘着性異物による発泡、粘着性異物の混入による再生紙の商品価値の低下、および再生紙の加熱による部分的な透明化というような再生紙化に係る問題が解消される。
【図面の簡単な説明】
【図１】本発明の実施例に係る防湿加工紙の拡大縦断面図。
【図２】本発明の実施例による防湿加工紙のサンプルについて透湿度、動摩擦係数、離解性およびコピー適性についての評価試験を行った結果を示す表。
【符号の説明】
１ 原紙
２ 防湿層
３ 水酸化アルミニウム細粉の粒子
４ コピー用紙[0001]
BACKGROUND OF THE INVENTION
The present invention relates to moisture-proof processed paper suitable for packaging paper such as copy paper (PPC paper).
[0002]
[Prior art and its problems]
Moisture-proof processed paper used for packaging of copy paper, etc. has a moisture-proof layer formed by applying or bonding a polymer compound such as polyethylene to kraft paper, which is the base paper, and this moisture-proof layer provides sufficient moisture-proof properties. However, when the used paper is regenerated, the polymer compound in the moisture-proof layer remains without being disaggregated, so that it cannot be used as recycled paper.
[0003]
Recyclable moisture-proof processed paper is coated with an emulsion containing paraffin wax on one or both sides of the kraft paper that is the base paper, or with a coating solution that is a mixture of synthetic rubber latex and wax emulsion. There is a layer formed, and sufficient moisture resistance is obtained by the wax component, but when these moisture-proof processed paper is used as a wrapping paper for copy paper, for example, the moisture-proof layer directly touches the copy paper and forms a moisture-proof layer. The contained wax component is transferred to the copy paper. As a result, the coefficient of friction on the surface of the copy paper becomes small, and a plurality of copy papers are sometimes fed in advance when the paper is fed by the copying machine.
[0004]
In addition, since the conventional moisture-proof processed paper has a small coefficient of friction on the surface due to the wax component, for example, when the paper wound in a roll shape is packaged with the conventional moisture-proof processed paper, Sliding may occur between the moisture-proof processed paper and the moisture-proof processed paper serving as the wrapping paper may be displaced to make the appearance worse, or the moisture-proof processed paper may be torn and the wound paper may fall off.
[0005]
[Object of the present invention]
The object of the present invention is to have sufficient moisture resistance and to be able to recycle used paper and the like, and the surface friction coefficient is sufficiently larger than that of the conventional one, so that paper such as copy paper can be used. It is to provide a moisture-proof processed paper suitable for packaging.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the moisture-proof processed paper according to the present invention comprises 10 to 50 weight percent of a low melting point wax having a melting point of 45 to 65 ° C. with respect to 100 parts by weight of a main material made of a styrene butadiene latex as a synthetic resin latex. A coating solution in which 2 to 30 parts by weight of aluminum hydroxide fine powder is added to 100 parts by weight of a moisture-proofing agent added to at least one surface of the base paper to form a moisture-proof layer, Assuming that the particle size of the powder is larger than the thickness of the moisture-proof layer, a part of the particles of the aluminum hydroxide fine powder protrude on the surface of the moisture-proof layer, and the friction coefficient of the surface becomes small due to the wax component of the moisture-proof layer. It is configured to prevent this .
[0007]
The moisture-proof layer has a thickness of 20 μm or less, and the aluminum hydroxide fine powder has a particle size in the range of 10 to 50 μm and is larger than the thickness of the moisture-proof layer.
[0008]
【Example】
Examples of the present invention will be described below.
The moisture-proof processed paper of this example forms a moisture-proof layer by coating the surface of kraft paper, which is a base paper, with a coating solution in which 2 to 30 parts by weight of aluminum hydroxide fine powder is added to 100 parts by weight of a moisture-proof agent. The aluminum hydroxide fine powder has a particle size larger than the thickness of the moisture-proof layer, and a part of the aluminum hydroxide fine powder particles are projected on the surface of the moisture-proof layer. 10 to 50 parts by weight of a low melting point wax (melting point of 45 to 65 ° C.) is added to 100 parts by weight of styrene butadiene latex (SBR) which is a synthetic resin latex .
[0009]
The addition amount of the low melting point wax is 10 to 50 parts by weight with respect to 100 parts by weight of the styrene butadiene latex. If the addition amount of the low melting point wax is less than 10 parts by weight, the moisture-proof property is lowered. If it is larger than the weight part, the coefficient of friction of the moisture-proof processed paper surface becomes extremely small, and if it is disaggregated, foaming will occur due to sticky foreign substances containing low melting point wax, resulting in inconvenience in the production of recycled paper. This is because the commercial value of recycled paper decreases due to the sticky foreign matter, and further, when the recycled paper is heated, it may become partially transparent .
[0010]
The moisture-proof layer has a thickness of 20 μm or less, and the aluminum hydroxide fine powder has a particle size in the range of 10 to 50 μm and is larger than the thickness of the moisture-proof layer.
[0011]
The thickness of the moisture-proof layer is set to 20 μm or less. If the moisture-proof layer is too thick, the coating work is complicated, and the moisture-proof layer in the fold portion is damaged when the moisture-proof processed paper is creased. This is because the moisture resistance may be reduced.
[0012]
In addition, the particle size of the aluminum hydroxide fine powder is set to 10 to 50 μm. If the particle size is smaller than 10 μm, the friction coefficient of the surface becomes small and the transfer of the wax component is prevented. On the other hand, if the particle size of the aluminum hydroxide fine powder is larger than 50 μm, the smoothness of the surface of the moisture-proof processed paper is deteriorated and the commercial value is remarkably lowered and the moisture-proof property is lowered.
[0013]
Furthermore, the addition amount of the aluminum hydroxide fine powder is 2 to 30 parts by weight with respect to 100 parts by weight of the moisture-proofing agent. If the addition amount of the aluminum hydroxide fine powder is smaller than 2 parts by weight, This is because the friction coefficient becomes small and the transfer of the wax component cannot be prevented, and if the amount added is more than 50 parts by weight, the moisture resistance is lowered.
[0014]
The specific manufacturing method of the moisture-proof processed paper according to the present embodiment is as follows.
Against JSR (trade name) manufactured by AE872,100 parts as styrene-butadiene latex, and the Chukyo Yushi as low melting wax (trade name) manufactured by Cellosol 428 (low melting wax emulsion) was added 30 parts by weight use moisture-proof agent, in the same manner as in example 1 as aluminum hydroxide fine powder with respect to a desiccant 100 parts by Nippon Light manufactured by (Corporation) trade name B-303 (the aluminum hydroxide flour of particle size 30 [mu] m) Add 16 parts by weight and base paper 70g / m 2 25 g / m 2 Apply dry and dry.
[0015]
The moisture-proof processed paper configured as described above has a moisture-
[0016]
When the moisture-proof processed paper of this embodiment is used as a wrapping paper for copy paper 4 or the like, sufficient moisture-proof property is obtained by the moisture-
[0017]
Therefore, the friction coefficient of the moisture-proof processed paper surface is not reduced by the wax component in the moisture-proofing agent, and the transfer of the wax component to the wrapping paper such as the copy paper 4 is also prevented.
[0018]
The samples of the moisture-proof processed paper obtained in the above examples were subjected to evaluation tests for moisture permeability, dynamic friction coefficient, disaggregation and copyability.
In conducting this evaluation test, the same evaluation test was performed on the moisture-proof processed paper samples obtained in Comparative Examples 1 to 3 below.
[0019]
<Comparative Example 1>
A polyethylene resin having a thickness of 20 μm was extruded and laminated on 70 g / m 2 of double kraft paper as a base paper.
[0020]
<Comparative Example 2>
With respect to 100 parts by weight of the trade name Pateracol SW-10 manufactured by Dainippon Ink and Chemicals, Ltd. as a moisture-proofing agent, instead of the aluminum hydroxide fine powder in the present invention, precipitated calcium carbonate manufactured by Shiroishi Calcium Co., Ltd. 16 parts by weight of PC (particle diameter: 4 μm) was added, and 25 g / m 2 of dry coated kraft paper (70 g / m 2 ) as a base paper was dried and dried.
[0021]
<Comparative Example 3>
A mixture of SBR latex AE872 manufactured by JSR Co., Ltd. as styrene butadiene latex and Cerosol 428 manufactured by Chukyo Yushi Co., Ltd. as a low melting wax in a ratio of 7: 3 is used as a base paper. 25 g / m 2 of dry coating was applied to 70 g / m 2 of paper and dried.
[0022]
<Test method>
The moisture permeability was measured according to JIS-Z-2080. If the value of moisture permeability is 50 g / m 2 · 24 hr or less, it can be evaluated that the moisture permeability is sufficient.
[0023]
As for the dynamic friction coefficient, a test was performed between the coating layer surface of the sample and the copy paper based on the JIS-P-8147 horizontal method. If the dynamic friction coefficient is 0.40 or more, it can be evaluated that the wrapping paper is not easily displaced due to slippage when used as a wrapping paper for copy paper.
[0024]
For disaggregation, use a standard disaggregator in accordance with JIS-P-8209, disaggregate a sample cut into 1 cm square with cold water for 20 minutes, visually check for undissolved material, and include undissolved material. Was considered good if it did not contain any unsettled material.
[0025]
As for copy suitability, copy paper is pre-packed with a sample so that it becomes 500 sheets / book, and the copy paper is set in a PPC copier FT-7000 manufactured by Ricoh Co., Ltd. I checked the number of sheets.
[0026]
<Evaluation results>
As shown in the table of FIG. 2, the moisture-proof processed paper obtained in the examples of the present invention can be evaluated as having sufficient practicality in terms of moisture permeability, dynamic friction coefficient and disaggregation, and also in copy suitability. It can be seen that no overlap feed occurred between the books or inside the book.
[0027]
[Operation and effect of the invention]
In the moisture-proof processed paper according to the present invention, the aluminum hydroxide fine powder particles added to the moisture-proofing agent protrude from the moisture-proof layer to the surface. For example, when used as a wrapping paper for copy paper, the copy paper is It comes into contact with the aluminum hydroxide particles, but hardly comes into contact with the moisture-proof layer containing the wax component.
[0028]
Therefore, the friction coefficient on the surface of the moisture-proof processed paper is prevented from being reduced by the wax component, and slipping between the paper and the copy paper is less likely to occur during the transportation of the copy paper as the packaged paper. The risk of slipping or tearing the moisture-proof processed paper as the wrapping paper due to slipping can be reduced.
[0029]
Further, as described above, contact between the moisture-proof layer containing the wax component and the copy paper as the wrapping paper is prevented, so that there is almost no transfer of the wax component to the copy paper, and copying is performed when paper is fed by a copying machine. Troubles such as repeated feeding of paper are unlikely to occur.
[0030]
In addition, since the moisture-proof layer contains aluminum hydroxide fine powder, the gloss of the surface is suppressed compared to conventional moisture-proof processed paper in which the wax component appears on the surface of the moisture-proof layer, and the moisture state of the surface is close to that of plain paper. It can be processed paper.
In addition, since the moisture-proof processed paper according to the present invention has disaggregation properties, it is possible to collect used paper and recycle it into recycled paper.
[0031]
Moreover, since the addition amount of the low melting point wax is 10 to 50 parts by weight with respect to 100 parts by weight of the main material made of styrene butadiene latex, the moisture-proof property produced when the addition amount of the low melting point wax is less than 10 parts by weight. reduction is prevented, and foaming due to sticky foreign matter amount the additive is to a low-melting wax during maceration that occurs when it is larger than 50 parts by weight Ingredient, commercial value of the recycled paper by incorporation of adhesive foreign matter This eliminates the problems associated with the use of recycled paper, such as lowering of the paper and partial transparency due to heating of the recycled paper.
[Brief description of the drawings]
FIG. 1 is an enlarged longitudinal sectional view of a moisture-proof processed paper according to an embodiment of the present invention.
FIG. 2 is a table showing the results of an evaluation test on moisture permeability, dynamic friction coefficient, disaggregation, and copyability of a moisture-proof processed paper sample according to an example of the present invention.
[Explanation of symbols]
1
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003022133A JP3769263B2 (en) | 2003-01-30 | 2003-01-30 | Moisture-proof paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003022133A JP3769263B2 (en) | 2003-01-30 | 2003-01-30 | Moisture-proof paper |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14474298A Division JP3426134B2 (en) | 1998-05-26 | 1998-05-26 | Moisture proof paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003213596A JP2003213596A (en) | 2003-07-30 |
| JP3769263B2 true JP3769263B2 (en) | 2006-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003022133A Expired - Lifetime JP3769263B2 (en) | 2003-01-30 | 2003-01-30 | Moisture-proof paper |
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| Country | Link |
|---|---|
| JP (1) | JP3769263B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106758445A (en) * | 2016-12-20 | 2017-05-31 | 墨宝股份有限公司 | A kind of energy-conserving and environment-protective twice laid dry method of paper-making method |
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2003
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| Publication number | Publication date |
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| JP2003213596A (en) | 2003-07-30 |
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