JP3779132B2 - Anti-rust paper - Google Patents

Anti-rust paper Download PDF

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Publication number
JP3779132B2
JP3779132B2 JP2000170556A JP2000170556A JP3779132B2 JP 3779132 B2 JP3779132 B2 JP 3779132B2 JP 2000170556 A JP2000170556 A JP 2000170556A JP 2000170556 A JP2000170556 A JP 2000170556A JP 3779132 B2 JP3779132 B2 JP 3779132B2
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JP
Japan
Prior art keywords
paper
rust
layer
synthetic resin
dust
Prior art date
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Expired - Fee Related
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JP2000170556A
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Japanese (ja)
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JP2001347610A (en
Inventor
孝弘 辻
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Keiwa Inc
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Keiwa Inc
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Publication of JP2001347610A publication Critical patent/JP2001347610A/en
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Description

【0001】
【発明の属する技術分野】
本発明は、防錆紙、特にシャドウマスク、リードフレーム等のクリーン度が要求される金属製品の包装に好適な防錆紙に関するものである。
【0002】
【従来の技術】
鋼板、銅などの金属製品の包装等に用いて錆の発生を防止する防錆紙11は、図2に示すように、紙素材に防錆剤が含浸又は塗布された防錆層12と、防湿性を付与するための合成樹脂層13とが積層されたものが一般的である。
【0003】
かかる防錆紙11で金属製品を包装することで、防錆層12からの防錆剤の揮発により金属製品の周囲を防錆剤の雰囲気とし、合成樹脂層13により錆の発生を加速する水分を遮断することと相まって、金属製品を防錆するものである。
【0004】
【発明が解決しようとする課題】
上記従来の防錆紙11は、製造時において、カッターで所定の寸法に裁断すると、防錆層12の紙素材から紙粉が発生する。また合成樹脂層13は、静電気を帯びやすく、ゴミやホコリなどが吸着しやすい。そのため、かかる防錆紙11で金属製品を包装すると、金属製品の表面に紙粉やホコリが付着してしまう。従って、特にシャドウマスク、リードフレーム等のクリーン度が要求される金属製品の包装には不向きである。
【0005】
また、上記防錆紙11を構成する防錆層12は、紙素材からなるため、吸排湿性を有する。一方、合成樹脂層13は防湿性を有する。そのため、使用環境の湿度の変化による防錆層12の伸縮率と合成樹脂層13の伸縮率とが異なるので、カールが発生しやすい。
【0006】
本発明はこれらの不都合に鑑みてなされたものであり、使用時にカールが発生しにくく、かつ、紙粉やホコリが少なく、シャドウマスク、リードフレーム等のクリーン度が要求される金属製品の包装に好適な防錆紙の提供を目的とするものである。
【0007】
【課題を解決するための手段】
上記課題を解決するためになされた発明は、無塵紙またはコート紙に防錆剤が含浸又は塗布された防錆層と、合成樹脂層と、基紙層とがこの順に積層された防錆紙である。 また、基紙層を構成する紙素材として、無塵紙またはコート紙を用いることもできる。
【0008】
本発明の防錆紙は、中間に合成樹脂層を挟んだ形のいわゆるポリサンドタイプであり、その両面を紙素材で構成することで、かかる両面の紙素材が適度な水分を保持し、静電気を帯びにくく、ホコリ等を寄せ付けにくくなる。 そのため、本発明の防錆紙によれば、上述のようなクリーン度が要求される金属製品の包装に好適となる。 また、このように両面が紙素材であるため、上下両層の吸排湿性が同様であり、カールの発生を低減することができる。
【0009】
これら防錆層の紙素材基紙層を構成する紙素材として、無塵紙コート紙を用いると、紙素材から紙粉が発生しないため、上述の紙粉等の発生防止作用を促進させることができる。
【0010】
また、当該防錆紙において、帯電防止機能を有する合成樹脂層にすると、静電気を帯びることによるホコリ等の吸着が防止できる。
【0011】
かかる帯電防止機能を発現する手段としては、合成樹脂層を構成する主ポリマーに静電誘導防止性を有する架橋性重合体を用いるとよい。このように、静電誘導防止性を有する架橋性重合体で形成された合成樹脂層は、高い導電性を有しているため、当該防錆紙において誘電分極した対電荷は誘電中和され、極めて短い緩和時間で分極電荷が消滅する。かかる架橋性重合体としては、側鎖にカルボキシル基と4級アンモニウム塩基とを有する架橋性重合体を用いることができる。
【0012】
【発明の実施の形態】
以下、適宜図面を参照しつつ本発明の実施の形態を詳説する。図1は本発明の防錆紙を示す模式的断面図である。
【0013】
図1の防錆紙は、防錆層2と合成樹脂層3と基紙層4とがこの順に積層された構造である。
【0014】
防錆層2は、無塵紙またはコート紙に気化性の防錆剤を含浸させたものである。 この防錆剤としては、例えば、トリエタノールアミン等の1、2、3級アミン類、安息香酸ナトリウム等の有機酸のアルカリ塩類、チオ尿素等の硫黄化合物、安息香酸ブチルエステル等のエステル類、石油スルホン酸ナトリウム等のアルキルスルホン酸塩類などが挙げられる。 かかる防錆剤の塗工量は、固形分換算で8g/m2以上30g/m2以下が好ましく、10g/m2以上15g/m2以下が特に好ましい。 これは、塗工量が上記範囲未満であると、防錆効果が不十分になり、逆に、塗工量が上記範囲を超えると、防錆層2の表面がべとついたり、防錆剤が結晶化したりすることからである。
【0016】
基紙層4を構成する紙素材として、無塵紙やコート紙の他に、例えば、上質紙、中質紙、晒クラフト紙、未晒クラフト紙、片艶未晒クラフト紙、ライナー紙、紙管原紙クラフト紙、中性クラフト紙などを用いることもできる。 このように、防錆紙1は、両面側に紙素材からなる防錆層2と基紙層4とを備えているため、(a) 静電誘導防止性を有し、ホコリ等の付着を低減することができる、(b) 吸排湿による伸縮率がほぼ同様であるので、カールの発生を低減することができる、等の効果を奏する。 なお、カールの発生の防止を完全なものにするためには、基紙層4の紙素材は、防錆層2の無塵紙またはコート紙と吸排湿による伸縮率が近しいものが好ましい。
【0017】
基紙層4を構成する紙素材としては、無塵紙コート紙が、紙粉等の発生防止性の観点から特に好ましい。
【0018】
合成樹脂層3に使用可能なポリマーとしては、例えばポリエチレン、ポリプロピレン、ポリメチルペンテン、エチレン酢酸ビニル樹脂、エチレンエチルアクリレート樹脂、エチレンアクリル酸樹脂、エチレンメタクリル酸樹脂、エチレンアクリル酸メチル樹脂、アイオノマー樹脂、ポリビニルアルコール、ポリエステル等が挙げられる。また、いわゆるメタロセン触媒を用いて重合されたポリエチレン、ポリプロピレン等も、好適に用いることができる。合成樹脂層3の厚みは特には限定されないが、一般的には8μm以上100μm以下程度とされる。
【0019】
合成樹脂層3は、帯電防止機能を有するものにするとよく、静電気を帯びることによるホコリ等の吸着が防止でき、紙粉等の発生防止作用をさらに向上させることができる。かかる帯電防止機能を発現する手段としては、帯電防止剤を合成樹脂層3を構成する主ポリマーに混合させる方法や、合成樹脂層3に帯電防止剤を塗工する方法が一般的であるが、合成樹脂層3を構成する主ポリマーに静電誘導防止性を有する架橋性重合体を用いる方法が特に好ましい。このように、合成樹脂層3を静電誘導防止性を有する架橋性重合体で形成すると、合成樹脂層3自体が高い導電性を有することとなり、防錆紙1に優れた静電誘導防止性が発現される。
【0020】
上記静電誘導防止性を有する架橋性重合体とは、例えば、(a)重合体の側鎖に存在する陽イオン基と遊離している陰イオンからなる荷電重合体、(b)重合体の側鎖に存在する陰イオン基と遊離している陽イオンからなる荷電重合体、(c)重合体の側鎖に存在する陽イオン基と陰イオン基からなる分子内荷電重合体などがあり、具体的には側鎖にカルボキシル基と4級アンモニウム塩基とを有する架橋性重合体を用いるとよい。これは、4級アンモニウム塩基が誘電分極性と導電性による速やかな誘電分極緩和性を付与する効果を有し、カルボキシル基が架橋性を高める効果を有することからである。
【0021】
上記防錆紙1の製造方法としては、防錆層2と基紙層4との間に合成樹脂層3を構成する溶融合成樹脂を押出ラミネーション法によって押出す方法や、防錆層2と合成樹脂層3と基紙層4とをドライラミネーション法により積層する方法などがある。
【0022】
【発明の効果】
以上説明したように、本発明の防錆紙によれば、使用時にカールが発生しにくく、かつ、紙粉やホコリが少なく、特にシャドウマスク、リードフレーム等のクリーン度が要求される金属製品の包装に好適である。
【図面の簡単な説明】
【図1】本発明の一実施形態に係る防錆紙を示す模式的断面図である。
【図2】従来の一般的な防錆紙を示す模式的断面図である。
【符号の説明】
1 防錆紙
2 防錆層
3 合成樹脂層
4 基紙層
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rust-proof paper, and particularly to a rust-proof paper suitable for packaging metal products that require a cleanness such as a shadow mask and a lead frame.
[0002]
[Prior art]
As shown in FIG. 2, the rust preventive paper 11 used to wrap metal products such as a steel plate and copper to prevent rust generation includes a rust preventive layer 12 in which a paper material is impregnated or coated with a rust preventive agent, A laminate in which a synthetic resin layer 13 for imparting moisture resistance is laminated is common.
[0003]
Moisture that accelerates the generation of rust by the synthetic resin layer 13 by packaging the metal product with the rust-proof paper 11 so that the rust-proof agent from the rust-proof layer 12 volatilizes the rust-preventive agent and makes the metal product the atmosphere of the rust-preventive agent. This is to prevent the metal product from being rusted in combination with shutting off.
[0004]
[Problems to be solved by the invention]
When the conventional rust-proof paper 11 is cut into a predetermined size with a cutter during production, paper dust is generated from the paper material of the rust-proof layer 12. In addition, the synthetic resin layer 13 is easily charged with static electricity and easily adsorbs dust and dust. Therefore, when a metal product is packaged with the rust-proof paper 11, paper dust and dust adhere to the surface of the metal product. Therefore, it is not suitable for the packaging of metal products that require cleanliness such as shadow masks and lead frames.
[0005]
Moreover, since the rust prevention layer 12 which comprises the said rust prevention paper 11 consists of paper materials, it has moisture absorption / exhaust property. On the other hand, the synthetic resin layer 13 has moisture resistance. Therefore, since the expansion ratio of the rust prevention layer 12 and the expansion ratio of the synthetic resin layer 13 due to changes in humidity in the usage environment are different, curling is likely to occur.
[0006]
The present invention has been made in view of these disadvantages. For use in packaging metal products that are less likely to curl during use, have little paper dust and dust, and require a high degree of cleanliness, such as shadow masks and lead frames. The purpose is to provide a suitable anti-rust paper.
[0007]
[Means for Solving the Problems]
The invention made in order to solve the above-mentioned problems is a rust-proof paper in which a rust-proof layer in which dust-free paper or coated paper is impregnated or coated with a rust preventive agent, a synthetic resin layer, and a base paper layer are laminated in this order. It is. Further, dust-free paper or coated paper can also be used as a paper material constituting the base paper layer.
[0008]
The anti-corrosion paper of the present invention is a so-called poly sand type in which a synthetic resin layer is sandwiched in between, and by constituting both sides of the paper material, the paper material on both sides retains appropriate moisture, and It is hard to be tinged with, and it is hard to attract dust. Therefore, according to the rustproof paper of the present invention, it is suitable for packaging metal products that require the above-described cleanliness. Moreover, since both surfaces are paper materials in this way, the moisture absorption and desorption properties of both upper and lower layers are the same, and curling can be reduced.
[0009]
If dust-free paper or coated paper is used as the paper material of these rust-preventive layers and the base paper layer, paper dust will not be generated from the paper material, so the above-mentioned action to prevent the occurrence of paper dust, etc. should be promoted. Can do.
[0010]
In addition, when the antirust paper is made of a synthetic resin layer having an antistatic function, adsorption of dust or the like due to static electricity can be prevented.
[0011]
As a means for expressing such an antistatic function, a crosslinkable polymer having electrostatic induction preventing property may be used for the main polymer constituting the synthetic resin layer. Thus, since the synthetic resin layer formed of the crosslinkable polymer having electrostatic induction preventing property has high conductivity, the counter charge that is dielectrically polarized in the rust-proof paper is dielectrically neutralized, Polarization charge disappears in a very short relaxation time. As such a crosslinkable polymer, a crosslinkable polymer having a carboxyl group and a quaternary ammonium base in the side chain can be used.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is a schematic cross-sectional view showing a rustproof paper of the present invention.
[0013]
The rustproof paper of FIG. 1 has a structure in which a rustproof layer 2, a synthetic resin layer 3, and a base paper layer 4 are laminated in this order.
[0014]
The rust preventive layer 2 is obtained by impregnating a dust-free paper or a coated paper with a vaporizable rust preventive agent. Examples of the anticorrosive agent include 1,2 and tertiary amines such as triethanolamine, alkali salts of organic acids such as sodium benzoate, sulfur compounds such as thiourea, esters such as butyl benzoate, Examples thereof include alkyl sulfonates such as sodium petroleum sulfonate. The coating amount of such anticorrosive is preferably from 8 g / m 2 or more 30 g / m 2 or less in terms of solid content, 10 g / m 2 or more 15 g / m 2 or less is particularly preferred. If the coating amount is less than the above range, the rust prevention effect becomes insufficient. Conversely, if the coating amount exceeds the above range, the surface of the rust prevention layer 2 becomes sticky or rust prevention. This is because the agent crystallizes.
[0016]
As a paper material constituting the base paper layer 4 , in addition to dust-free paper and coated paper, for example, high-quality paper, medium-quality paper, bleached kraft paper, unbleached kraft paper, glossy unbleached kraft paper, liner paper, paper tube Base paper kraft paper, neutral kraft paper, etc. can also be used. Thus, since the rust preventive paper 1 is provided with the rust preventive layer 2 and the base paper layer 4 made of a paper material on both sides, (a) it has an electrostatic induction preventing property and adheres dust and the like. (B) Since the expansion / contraction rate due to moisture absorption / extraction is substantially the same, the effects of curling can be reduced. In order to completely prevent the occurrence of curling, the paper material of the base paper layer 4 is preferably close to the dust-free paper or coated paper of the rust prevention layer 2 and the expansion / contraction rate due to moisture absorption / extraction.
[0017]
As the paper material constituting the base paper layer 4, dust-free paper or coated paper is particularly preferable from the viewpoint of preventing generation of paper dust and the like.
[0018]
Examples of polymers that can be used for the synthetic resin layer 3 include polyethylene, polypropylene, polymethylpentene, ethylene vinyl acetate resin, ethylene ethyl acrylate resin, ethylene acrylic acid resin, ethylene methacrylic acid resin, ethylene methyl acrylate resin, ionomer resin, Examples include polyvinyl alcohol and polyester. In addition, polyethylene, polypropylene and the like polymerized using a so-called metallocene catalyst can also be suitably used. The thickness of the synthetic resin layer 3 is not particularly limited, but is generally about 8 μm to 100 μm.
[0019]
The synthetic resin layer 3 may have an antistatic function, can prevent dust and the like from being adsorbed due to static electricity, and can further improve the action of preventing generation of paper dust and the like. As a means for expressing such an antistatic function, a method of mixing an antistatic agent with the main polymer constituting the synthetic resin layer 3 and a method of applying an antistatic agent to the synthetic resin layer 3 are common. A method in which a crosslinkable polymer having electrostatic induction preventing property is used as the main polymer constituting the synthetic resin layer 3 is particularly preferable. Thus, when the synthetic resin layer 3 is formed of a crosslinkable polymer having electrostatic induction preventing property, the synthetic resin layer 3 itself has high conductivity, and the electrostatic induction preventing property excellent in the rust-proof paper 1 is obtained. Is expressed.
[0020]
The crosslinkable polymer having the electrostatic induction preventing property is, for example, (a) a charged polymer composed of a cationic group present in a side chain of the polymer and a free anion, and (b) a polymer. There are charged polymers composed of an anionic group present in the side chain and a free cation, (c) an intramolecular charged polymer composed of a cation group and an anionic group present in the side chain of the polymer, etc. Specifically, a crosslinkable polymer having a carboxyl group and a quaternary ammonium base in the side chain may be used. This is because the quaternary ammonium base has the effect of imparting dielectric polarization and rapid dielectric polarization relaxation by conductivity, and the carboxyl group has the effect of enhancing crosslinkability.
[0021]
As the manufacturing method of the rust-proof paper 1, a method of extruding a molten synthetic resin constituting the synthetic resin layer 3 between the rust-proof layer 2 and the base paper layer 4 by an extrusion lamination method, There is a method of laminating the resin layer 3 and the base paper layer 4 by a dry lamination method.
[0022]
【The invention's effect】
As described above, according to the rustproof paper of the present invention, curling is unlikely to occur during use, and there is little paper dust and dust, and particularly for metal products that require cleanliness such as shadow masks and lead frames. Suitable for packaging.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a rustproof paper according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view showing a conventional general rust-proof paper.
[Explanation of symbols]
1 Rustproof paper 2 Rustproof layer 3 Synthetic resin layer 4 Base paper layer

Claims (6)

無塵紙またはコート紙に防錆剤が含浸または塗布された防錆層と、合成樹脂層と、基紙層とがこの順に積層された、ことを特徴とする金属製品の包装用防錆紙。A rust-proof paper for packaging metal products, characterized in that a rust-proof layer in which dust- proof paper or coated paper is impregnated or coated with a rust-proofing agent, a synthetic resin layer, and a base paper layer are laminated in this order. 前記基紙層を構成する紙素材が、無塵紙である請求項1に記載の金属製品の包装用防錆紙。The rustproof paper for packaging metal products according to claim 1, wherein the paper material constituting the base paper layer is dust-free paper. 前記基紙層を構成する紙素材が、コート紙である請求項1に記載の金属製品の包装用防錆紙。The rustproof paper for packaging metal products according to claim 1, wherein the paper material constituting the base paper layer is coated paper. 前記合成樹脂層が、帯電防止機能を有する請求項1乃至3のいずれかに記載の金属製品の包装用防錆紙。  The rustproof paper for packaging metal products according to any one of claims 1 to 3, wherein the synthetic resin layer has an antistatic function. 前記帯電防止機能が、前記合成樹脂層を構成する主ポリマーに用いられている静電誘導防止性を有する架橋性重合体によって発現される請求項4に記載の金属製品の包装用防錆紙。  The rustproof paper for packaging metal products according to claim 4, wherein the antistatic function is expressed by a crosslinkable polymer having an electrostatic induction preventing property used for a main polymer constituting the synthetic resin layer. 前記架橋性重合体が、側鎖にカルボキシル基と4級アンモニウム塩基とを有する架橋性重合体である請求項5に記載の金属製品の包装用防錆紙。  The rustproof paper for packaging metal products according to claim 5, wherein the crosslinkable polymer is a crosslinkable polymer having a carboxyl group and a quaternary ammonium base in the side chain.
JP2000170556A 2000-06-07 2000-06-07 Anti-rust paper Expired - Fee Related JP3779132B2 (en)

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JP5152688B2 (en) * 2007-06-28 2013-02-27 王子ホールディングス株式会社 Anti-rust paper
JPWO2018164155A1 (en) * 2017-03-08 2020-01-23 Jx金属株式会社 Vacuum-packaged product of high-purity metal and method of manufacturing the vacuum-packaged product

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