JP6109654B2 - Surface protection sheet - Google Patents
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- JP6109654B2 JP6109654B2 JP2013133502A JP2013133502A JP6109654B2 JP 6109654 B2 JP6109654 B2 JP 6109654B2 JP 2013133502 A JP2013133502 A JP 2013133502A JP 2013133502 A JP2013133502 A JP 2013133502A JP 6109654 B2 JP6109654 B2 JP 6109654B2
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本発明は、ガラス又は金属の表面保護に用いられる表面保護シートに関する。 The present invention relates to a surface protective sheet used for glass or metal surface protection.
ガラス製品、金属製品、鏡面光沢を有する製品は、製造、保管、運搬中に表面に物理的な損傷、汚染等の不具合が生じやすく、こうした不具合は、各種製品の製造の際の歩留まりに大きく影響する。例えば、表面に電気回路等を組み込むガラス基板として使用される液晶ディスプレイ用ガラス板は、複数枚を重ね合わせて保管、搬送する場合が多いところ、その保管、運搬中に他のガラス板と接触する等により僅かでも損傷、汚染を生じるとディスプレイに組み込んで使用する場合に不具合を生ずるため、極めて高度の表面特性を必要とする。このガラス基板としての表面特性を確保し、隣接して積層されているガラス板どうしの接触による損傷等の不具合を防止すべく、従来、積層するガラス板間にガラス用合紙を挿入することが行われている。 別の例として、金属箔が使用されるフレキシブルプリント基板やリードフレーム等の精密部品は、金属面同士や部品同士の摩擦等により損傷、汚染が生じると最終製品に不具合が生ずるため、やはり高度の表面特性が必要とされ、合紙が使用されている。 Glass products, metal products, and products with specular gloss are susceptible to defects such as physical damage and contamination on the surface during manufacture, storage, and transportation, and these defects have a significant impact on the production yield of various products. To do. For example, a glass plate for a liquid crystal display used as a glass substrate in which an electric circuit or the like is incorporated on the surface is often stored and transported with a plurality of stacked ones, and comes into contact with other glass plates during the storage and transport. Even if slight damage or contamination occurs due to, for example, a problem occurs when used in a display, extremely high surface characteristics are required. In order to ensure the surface characteristics of this glass substrate and prevent problems such as damage due to contact between adjacent glass plates, it is conventionally possible to insert a glass slip sheet between the laminated glass plates. Has been done. As another example, precision parts such as flexible printed circuit boards and lead frames that use metal foil are damaged due to friction between metal surfaces and parts. Surface properties are required and slip sheets are used.
ガラス用合紙に関し、例えば特許文献１には、傷の発生防止能が高く、合紙の成分がガラス板表面に付着しても容易に水洗除去可能なガラス用合紙として、アルギン酸アンモニウム等の水溶性有機酸塩を含む処理剤を紙に塗工したものが記載されている。特許文献１によれば、特許文献１に記載のガラス用合紙は、処理剤を含有する膜の作用により弾性を有しているので摩擦係数が低下しており、そのため、積層するガラス板間に挿入して使用しても傷が付きにくいとされている。 Regarding glass slip sheets, for example, Patent Document 1 discloses a glass slip sheet that has a high ability to prevent scratches and can be easily washed away with water even when components of the slip sheets adhere to the glass plate surface, such as ammonium alginate. A paper is described in which a treatment agent containing a water-soluble organic acid salt is coated on paper. According to Patent Document 1, since the glass slip sheet described in Patent Document 1 has elasticity due to the action of the film containing the treatment agent, the friction coefficient is lowered, and therefore, between the laminated glass plates It is said that it is hard to be damaged even if it is inserted and used.
特許文献１の〔０００４〕及び〔０００５〕等に記載されているように、ガラス用合紙においては、従来、合紙の樹脂成分がガラス板表面に転写されてガラス板表面を汚染するという問題が指摘されており、この問題を回避するため、ガラス用合紙としては従来、樹脂成分の含有量が少ない紙が用いられている。また、特許文献１に記載のガラス用合紙は、この問題に鑑み、該合紙の成分がガラス板表面に付着しても容易に水洗除去可能である点を主たる特徴の１つとしている。このように、ガラス用合紙の分野においては、ガラス用合紙の成分が保護対象物であるガラス板表面に転写されることは望ましくないこととされており、例えば特許文献２に記載の如き、原紙上にポリエチレンワックスが塗工された紙（新聞用紙）をガラス用合紙として用いることは、当業者の常識の範囲外と言える。 As described in [0004] and [0005] of Patent Document 1, conventionally, in the slip paper for glass, the resin component of the slip paper is transferred to the glass plate surface and contaminates the glass plate surface. In order to avoid this problem, paper having a low resin component content has been conventionally used as a glass interleaving paper. In view of this problem, the glass slip sheet described in Patent Document 1 has one of the main features that it can be easily washed and removed even if components of the slip sheet adhere to the glass plate surface. Thus, in the field of glass slip paper, it is considered that it is not desirable that the components of the glass slip paper be transferred to the surface of the glass plate, which is an object to be protected. For example, as described in Patent Document 2 The use of a paper (newspaper paper) coated with polyethylene wax on the base paper as a glass interleaving paper is outside the scope of common knowledge of those skilled in the art.
また、ガラス用合紙によるガラス板の保護ではなく、ガラス板そのものの保護についても種々提案がなされており、例えば特許文献３には、ガラス板表面に水溶性保護膜を形成することが記載されており、この水溶性保護膜の成分としてポリエチレンが例示されている。 In addition, various proposals have been made not only for protection of a glass plate with glass interleaf, but also for protection of the glass plate itself. For example, Patent Document 3 describes forming a water-soluble protective film on the surface of a glass plate. Polyethylene is exemplified as a component of this water-soluble protective film.
また、金属製品用合紙に関し、例えば特許文献４には、ステンレス鋼帯用合紙として、クラフト紙に滑剤を塗工含有させ、表裏面の動摩擦係数を特定範囲に調整したものが記載されている。特許文献４に記載の合紙は、ステンレス鋼帯の加工工程（調質圧延工程）において、潤滑油を用いずにステンレス鋼帯の圧延を円滑に進めるためのものであり、特許文献４によれば、ステンレス鋼帯の巻取り用合紙としてステンレス鋼帯と一緒に巻き取って使用することにより、合紙表面から滑剤がステンレス鋼帯の表面に転移し、これにより、圧延処理に際しステンレス鋼帯が伸び易くなり、圧延処理が極めて円滑にできるようになるとされている。 Moreover, regarding the interleaving paper for metal products, for example, Patent Document 4 describes a stainless steel belt interleaving paper in which a kraft paper is coated with a lubricant and the dynamic friction coefficient of the front and back surfaces is adjusted to a specific range. Yes. The slip sheet described in Patent Document 4 is for smoothly rolling the stainless steel strip without using lubricating oil in the processing step (temper rolling process) of the stainless steel strip. For example, when used together with a stainless steel strip as a slip sheet for winding a stainless steel strip, the lubricant is transferred from the surface of the slip to the surface of the stainless steel strip. It is said that it becomes easy to extend and the rolling process can be performed very smoothly.
本発明は、ガラス又は金属の表面保護効果に優れる表面保護シートに関する。 The present invention relates to a surface protective sheet excellent in the surface protective effect of glass or metal.
本発明者らは、ガラス用合紙について種々検討した結果、特許文献１に記載の如き、この分野の常識（ガラス用合紙の樹脂成分の含有量が多いと、該樹脂成分がガラス表面に転写されてこれを汚染するので、ガラス用合紙としては樹脂成分の含有量が少ないものを用いる。）に反し、ポリエチレンワックスを比較的多量に含有する樹脂含有紙が、ガラス表面の傷発生防止能を高めるのに有効であるとの知見を得た。この樹脂含有紙をガラス表面に当接させると、それに含まれるポリエチレンがガラス表面に転写して保護層が形成されるため、ガラス表面が該保護層によって物理的に保護され、ガラス表面に傷が付きにくくなる。 As a result of various studies on glass interleaving papers, the present inventors have found common knowledge in this field as described in Patent Document 1 (if the content of the resin component of the glass interleaving paper is large, the resin component is attached to the glass surface. (Transfers and contaminates this, so use paper with low resin component content as glass interleaving paper.) In contrast, resin-containing paper containing a relatively large amount of polyethylene wax prevents scratches on the glass surface. The knowledge that it was effective in enhancing the performance was obtained. When this resin-containing paper is brought into contact with the glass surface, the polyethylene contained therein is transferred to the glass surface to form a protective layer, so that the glass surface is physically protected by the protective layer, and the glass surface is scratched. It becomes difficult to stick.
本発明は、前記知見に基づきなされたもので、ガラス又は金属の表面に当接させて使用する表面保護シートであって、繊維を主体とする支持体に、ポリエチレンを主体とする表面保護機能付与剤を固形量換算で０．１ｇ／ｍ2以上付与してなる表面保護シートである。 The present invention was made on the basis of the above knowledge, and is a surface protective sheet used by being brought into contact with the surface of glass or metal, and imparting a surface protection function mainly composed of polyethylene to a support mainly composed of fibers. It is a surface protection sheet formed by applying 0.1 g / m 2 or more of an agent in terms of solid amount.
本発明の表面保護シートによれば、該シートと当接された保護対象面（ガラス又は金属の表面）に保護層が形成されるので、該保護対象面に傷や錆等の不具合が生じ難く、優れた表面保護効果が得られる。 According to the surface protective sheet of the present invention, since a protective layer is formed on the surface to be protected (the surface of glass or metal) in contact with the sheet, defects such as scratches and rust hardly occur on the surface to be protected. Excellent surface protection effect can be obtained.
本発明に係る支持体は、繊維を主体とするシート状物である。ここでいう、「繊維を主体とする」は、支持体中の繊維の含有率が５０質量％以上であることを意味する。本発明に係る支持体は、好ましくは紙又は布である。布の場合は、織布でも良く、あるいは乾式法、湿式法、スパンボンド法等による不織布でも良い。紙としては、製紙用として一般的に用いられている木材パルプ等の繊維を原料として用い、公知の湿式抄紙機により抄紙したものが挙げられる。また、本発明に係る支持体は、単層にかぎらず、同種又は２種以上のシート状物を組み合わせた積層構造としても良い。 The support according to the present invention is a sheet-like material mainly composed of fibers. As used herein, “mainly composed of fibers” means that the content of fibers in the support is 50% by mass or more. The support according to the present invention is preferably paper or cloth. In the case of a cloth, a woven cloth may be used, or a non-woven cloth obtained by a dry method, a wet method, a spunbond method, or the like may be used. Examples of the paper include paper made by a known wet paper machine using fibers such as wood pulp generally used for papermaking as raw materials. The support according to the present invention is not limited to a single layer, and may have a laminated structure in which the same kind or two or more kinds of sheet-like materials are combined.
本発明に係る支持体の構成繊維としては、紙あるいは布の構成繊維として通常用いられているものを特に制限なく用いることができ、例えば、針葉樹晒クラフトパルプ（ＮＢＫＰ）、広葉樹晒クラフトパルプ（ＬＢＫＰ）、針葉樹晒サルファイトパルプ（ＮＢＳＰ）、サーモメカニカルパルプ（ＴＭＰ）等の木材パルプ；他、麻、竹、藁、ケナフ、三椏、楮、木綿等の非木材パルプ；カチオン化パルプ、マーセル化パルプ等の変性パルプ；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）等の樹脂からなる合成繊維等が挙げられ、これらの１種を単独で又は２種以上を組み合わせて用いることができる。 As the constituent fibers of the support according to the present invention, those usually used as constituent fibers of paper or cloth can be used without particular limitation. For example, softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP) ), Wood pulp such as bleached sulphite pulp (NBSP) and thermomechanical pulp (TMP); other non-wood pulp such as hemp, bamboo, straw, kenaf, sanaf, straw, cotton, etc .; cationized pulp, mercerized pulp Modified fibers such as polyethylene; PE (polypropylene), polypropylene (PP), synthetic fibers made of polyethylene terephthalate (PET), and the like. These can be used alone or in combination of two or more. .
本発明に係る支持体には、必要に応じ繊維以外の他の成分を含有させても良い。支持体に含有可能な繊維以外の他の成分としては、例えば、澱粉、ポリアクリルアミド、ポリアミンポリアミドエピクロルヒドリン等の紙力増強剤又は定着剤、サイズ剤、填料、濾水歩留り向上剤、耐水化剤、定着剤、消泡剤、スライムコントロール剤等を挙げられ、これらの１種を単独で又は２種以上を組み合わせて用いることができる。これら他の成分は、一般に製紙用内添薬品として用いられるもので、特に支持体が紙である場合に有効である。但し、本発明の表面保護シートの保護対象が前述の液晶ディスプレイ用ガラス板のように汚染を禁忌とする用途の場合は、当該用途に影響を及ぼさない範囲で他の成分を使用できる。 You may make the support body which concerns on this invention contain other components other than a fiber as needed. Examples of components other than fibers that can be contained in the support include, for example, paper strength enhancers or fixing agents such as starch, polyacrylamide, and polyamine polyamide epichlorohydrin, sizing agents, fillers, drainage retention improvers, water resistance agents, A fixing agent, an antifoaming agent, a slime control agent and the like can be mentioned, and one of these can be used alone or two or more can be used in combination. These other components are generally used as internal chemicals for papermaking, and are particularly effective when the support is paper. However, in the case where the object to be protected by the surface protective sheet of the present invention is an application in which contamination is contraindicated, such as the above-described glass plate for liquid crystal display, other components can be used within a range that does not affect the application.
本発明に係る支持体の坪量は、特に制限されず、表面保護シートの用途等に応じて適宜調整すれば良い。例えば表面保護シートをガラス用合紙として用いる場合、支持体の坪量は、好ましくは３０〜１００ｇ／ｍ2、更に好ましくは３０〜５０ｇ／ｍ2である。 The basis weight of the support according to the present invention is not particularly limited, and may be appropriately adjusted according to the use of the surface protective sheet. For example, when using a surface protection sheet as a slip sheet for glass, the basis weight of the support is preferably 30 to 100 g / m 2 , more preferably 30 to 50 g / m 2 .
本発明の表面保護シートは、前述した支持体に、ポリエチレンを主体とする表面保護機能付与剤を付与してなる。前述したように、本発明の表面保護シートは、これに含まれるポリエチレンを保護対象面（ガラス又は金属の表面）に転写させて、該保護対象面に該ポリエチレンからなる保護層を形成する機能を有するものであり、ポリエチレンは、本発明の斯かる機能発現に必須の成分である。表面保護機能付与剤中のポリエチレンの含有率は、好ましくは３０〜１００質量％、更に好ましくは５０〜１００質量％である。 The surface protective sheet of the present invention is obtained by imparting a surface protective function-imparting agent mainly composed of polyethylene to the support described above. As described above, the surface protective sheet of the present invention has a function of transferring the polyethylene contained therein onto a surface to be protected (glass or metal surface) and forming a protective layer made of the polyethylene on the surface to be protected. Polyethylene is an essential component for such function expression of the present invention. The polyethylene content in the surface protective function-imparting agent is preferably 30 to 100% by mass, more preferably 50 to 100% by mass.
本発明に係る表面保護機能付与剤の好ましい一例として、水に分散可能なポリエチレンワックスを含む表面保護機能付与剤が挙げられる。このポリエチレンワックスを水に分散させたポリエチレンワックスエマルジョンは、本発明に係る表面保護機能付与剤として好ましく用いられる。本発明に係る表面保護機能付与剤には、２種以上のポリエチレン（ポリエチレンワックス）を含有させても良い。 As a preferable example of the surface protection function-imparting agent according to the present invention, a surface protection function-imparting agent containing polyethylene wax dispersible in water can be mentioned. This polyethylene wax emulsion in which polyethylene wax is dispersed in water is preferably used as the surface protection function-imparting agent according to the present invention. The surface protection function-imparting agent according to the present invention may contain two or more kinds of polyethylene (polyethylene wax).
本発明で用いるポリエチレンワックスの好ましい一例として、酸化型ポリエチレンワックスが挙げられる。酸化型ポリエチレンワックスは、ポリエチレンワックスを化学反応により酸化するか、又はポリエチレンワックスに水酸基、カルボキシル基等の酸性基を導入することにより得られる。酸化型ポリエチレンワックスは、その分子鎖内に極性基を有していることから、これを含むエマルジョン（表面保護機能付与剤）の形成を安定したものとなすことができる。酸化型ポリエチレンワックスとしては、市販品を用いることができ、例えば、サンノプコ株式会社製の商品名「ノプコートＰＥＭ−１７」が挙げられる。 A preferred example of the polyethylene wax used in the present invention is an oxidized polyethylene wax. Oxidized polyethylene wax can be obtained by oxidizing polyethylene wax by chemical reaction or introducing an acidic group such as a hydroxyl group or a carboxyl group into polyethylene wax. Since the oxidized polyethylene wax has a polar group in its molecular chain, the formation of an emulsion containing the same (surface protection function-imparting agent) can be stabilized. A commercially available product can be used as the oxidized polyethylene wax, and examples thereof include trade name “Nopcoat PEM-17” manufactured by San Nopco Corporation.
本発明に係る表面保護機能付与剤には、必要に応じ、ポリエチレン（ポリエチレンワックス）以外の他の樹脂成分、例えば、ポリビニルアルコール（ＰＶＡ）、ポリアクリルアミドの１種以上を含有させても良い。また、表面保護機能付与剤には、樹脂以外の他の成分、例えば、アセチレングリコール等の１種以上を含有させても良い。 If necessary, the surface protective function-imparting agent according to the present invention may contain one or more resin components other than polyethylene (polyethylene wax), for example, polyvinyl alcohol (PVA) or polyacrylamide. Further, the surface protective function-imparting agent may contain one or more components other than the resin, for example, acetylene glycol.
本発明においては、表面保護機能付与剤（例えばポリエチレンワックスエマルジョン）の支持体への付与量を、固形量換算で０．１ｇ／ｍ2以上とする。斯かる表面保護機能付与剤の特定の付与量は、例えば特許文献２に記載の新聞用紙におけるポリエチレンワックスの塗布量０．００５〜０．０２５ｇ／ｍ2を大きく超えるものであり、本発明の表面保護シートには比較的多量のポリエチレンが含まれていると言える。このような多量の樹脂成分を含むシートを、ガラス用合紙の如き表面保護シートとして用いることは、従来では考え難いことである。表面保護機能付与剤の支持体への付与量が固形量換算で０．１ｇ／ｍ2未満では、保護対象面の表面保護効果に乏しい。一方、表面保護機能付与剤の付与量が多すぎると、得られたシートの表面が滑りやすくなり、該シートのハンドリング性が低下するおそれがある。以上の観点から、表面保護機能付与剤の支持体への付与量は、固形量換算で、好ましくは０．１〜０．８ｇ／ｍ2、更に好ましくは０．１〜０．３ｇ／ｍ2である。 In the present invention, the amount of the surface protection function-imparting agent (for example, polyethylene wax emulsion) applied to the support is 0.1 g / m 2 or more in terms of solid amount. The specific application amount of such a surface protective function-imparting agent greatly exceeds, for example, the coating amount of polyethylene wax in newspapers described in Patent Document 2 from 0.005 to 0.025 g / m 2. It can be said that the protective sheet contains a relatively large amount of polyethylene. Conventionally, it is difficult to use such a sheet containing a large amount of resin component as a surface protective sheet such as a slip sheet for glass. When the amount of the surface protective function-imparting agent applied to the support is less than 0.1 g / m 2 in terms of solid amount, the surface protection effect of the surface to be protected is poor. On the other hand, if the applied amount of the surface protection function-imparting agent is too large, the surface of the obtained sheet becomes slippery and the handling property of the sheet may be lowered. From the above viewpoint, the amount of the surface protective function-imparting agent applied to the support is preferably 0.1 to 0.8 g / m 2 , more preferably 0.1 to 0.3 g / m 2 in terms of solid amount. It is.
表面保護機能付与剤の支持体への付与方法としては、紙あるいは布に流動性を有する剤を付与するのに通常用いられる公知の方法を特に制限なく用いることができ、例えば、表面保護機能付与剤あるいはこれを含む液中への支持体の浸漬、各種塗工機を用いた表面保護機能付与剤の塗工、積層等が挙げられる。後者の場合、表面保護機能付与剤は支持体の一面のみに塗工しても良く、両面に塗工しても良い。 As a method for imparting a surface protection function-imparting agent to a support, a known method that is usually used for imparting a fluid agent to paper or cloth can be used without particular limitation. For example, imparting a surface protection function Examples include immersion of the support in an agent or a liquid containing the same, coating of a surface protection function-imparting agent using various coating machines, and lamination. In the latter case, the surface protective function-imparting agent may be applied only on one side of the support or on both sides.
本発明の表面保護シートは、その表面（表面保護機能付与剤を支持体の一面に塗工により付与した場合はその付与面）を保護対象物であるガラス又は金属の表面に当接させて使用する。斯かる使用方法により、保護対象物の表面に、表面保護シートに含まれるポリエチレンが転写されて保護層（ポリエチレン含有層）が形成され、該保護層によって、保護対象物の傷発生防止能が向上する。こうして保護層で表面が被覆された保護対象物（ガラス又は金属）は、そのまま各種用途に適用可能であり、保護層の意図的な除去は基本的に不要である。本発明の表面保護シートは、積層するガラス板間に挿入して使用するガラス用合紙の他、ガラス製品、金属製品、鏡面光沢を有する製品の表面保護用途全般に使用可能である。
The surface protective sheet of the present invention is used by bringing its surface (the surface to which a surface protection function-imparting agent is applied on one side of the support by application) onto the surface of glass or metal that is the object to be protected. To do. With such use for how, on the surface of the protected object, the protective layer of polyethylene contained in the surface protective sheet is transferred (polyethylene-containing layer) is formed by the protective layer, a scratch prevention ability of protective object Will improve. The object to be protected (glass or metal) whose surface is thus coated with the protective layer can be applied to various uses as it is, and intentional removal of the protective layer is basically unnecessary. The surface protective sheet of the present invention can be used for general surface protection applications of glass products, metal products, and products having specular gloss, as well as glass slip sheets used by being inserted between laminated glass plates.
以下、本発明を具体的に説明するために実施例を挙げるが、本発明は以下の実施例によって制限されるものではない。 EXAMPLES Hereinafter, examples are given to specifically describe the present invention, but the present invention is not limited to the following examples.
〔実施例１〜８及び比較例１〜３〕
下記３種の支持体Ａ〜Ｃの何れかに、下記５種の処理剤Ａ〜Ｅの何れかを固形量換算で所定量付与し、複数種の表面保護シートを作製した。処理剤の支持体への付与は次のようにして行った。縦２１０ｍｍ、横２１０ｍｍの平面視四角形形状の支持体を、処理剤中に完全に浸漬させた後、辻井染機工業製ＶＰＭ−１Ａを用いて該支持体から余分な処理剤を搾り取り、１１０℃に加温したシリンダードライヤーで乾燥した。処理剤は、所定の付与量になるよう、適宜水で希釈して用いた。処理剤の支持体への付与量（固形量換算）は、処理剤浸漬前の支持体重量と、余分な処理剤を搾り取った後の支持体重量と、処理剤の固形分濃度とから算出した。
[Examples 1-8 and Comparative Examples 1-3]
A predetermined amount of any one of the following five types of treatment agents A to E was applied to any one of the following three types of supports A to C in terms of solid amount to produce a plurality of types of surface protective sheets. The treatment agent was applied to the support as follows. A substrate having a rectangular shape of 210 mm in length and 210 mm in width in plan view is completely immersed in the treatment agent, and then the excess treatment agent is squeezed out from the support using VPM-1A manufactured by Sakurai Dyeing Machine Co., Ltd. It dried with the cylinder dryer heated at ℃. The treatment agent was appropriately diluted with water so that a predetermined application amount was obtained. The amount of treatment agent applied to the support (in terms of solid amount) is calculated from the support weight before immersion of the treatment agent, the support weight after squeezing excess treatment agent, and the solid content concentration of the treatment agent. did.
・支持体Ａ：ＮＢＫＰをダブルディスクリファイナーで濾水度５００ｍｌになるように叩解し、これに星光ＰＭＣ製湿潤紙力剤ＷＳ４０５２を０．１質量％添加して得たスラリーを用い、長網式抄紙機により常法に従って湿式抄紙法を実施し、坪量４５ｇ／ｍ2の紙を得た。
・支持体Ｂ：ＮＢＫＰとＬＢＫＰとをそれぞれ等量混合し、ダブルディスクリファイナーで濾水度４５０ｍｌになるように叩解し、これに星光ＰＭＣ製湿潤紙力剤ＷＳ４０５２を０．１質量％添加して得たスラリーを用い、長網式抄紙機により常法に従って湿式抄紙法を実施し、坪量４５ｇ／ｍ2の紙を得た。
・支持体Ｃ：帝人製テルピス（登録商標）ＴＴ０４Ｎ（ポリエステル繊維、１．７デニール、カット長５ｍｍ）８０質量部と、帝人製テルピス（登録商標）ＴＪ０４ＣＮ（ポリエステル繊維、１．７デニール、カット長５ｍｍ）２０質量部とを混合して得たスラリーを用い、１００メッシュの網で２５０ｍｍ四方のシートを湿式抄紙法により抄造し、該シートを脱水後、１１０℃に加温したシリンダードライヤーで乾燥し、坪量４５ｇ／ｍ2の布（湿式法による不織布）を得た。
Support A: NBKP was beaten with a double disc refiner to a freeness of 500 ml, and a slurry obtained by adding 0.1% by weight of wet paper strength agent WS4052 made by Starlight PMC to this was used. wet paper-making process was carried out according to a conventional method by the paper machine to obtain a paper having a basis weight of 45 g / m 2.
Support B: NBKP and LBKP are mixed in equal amounts, beaten with a double disc refiner to a freeness of 450 ml, and 0.1% by mass of Starlight PMC wet paper strength agent WS4052 is added. Using the obtained slurry, a wet papermaking method was carried out according to a conventional method using a long net paper machine to obtain a paper having a basis weight of 45 g / m 2 .
Support C: 80 parts by mass of Teijin Terpis (registered trademark) TT04N (polyester fiber, 1.7 denier, cut length 5 mm) and Teijin Terpis (registered trademark) TJ04CN (polyester fiber, 1.7 denier, cut length) 5 mm) Using a slurry obtained by mixing 20 parts by mass, a sheet of 250 mm square was made with a 100 mesh net by a wet papermaking method, and the sheet was dehydrated and dried with a cylinder dryer heated to 110 ° C. A cloth having a basis weight of 45 g / m 2 (nonwoven fabric by a wet method) was obtained.
・処理剤Ａ：ポリエチレンワックスエマルジョン（サンノプコ製、ノプコートＰＥＭ−１７）
・処理剤Ｂ：ポリエチレンワックスエマルジョン（サンノプコ製、ノプコートＰＥＭ−１７）５０質量部とポリビニルアルコール（クラレ製、ＰＶＡ２０５）５０質量部との混合物
・処理剤Ｃ：ポリエチレンワックスエマルジョン（日華化学製、サントールＰ−４０）
・処理剤Ｄ：ポリエチレンワックスエマルジョン（明成化学製、メイカテックスＨＰ−７０）
・処理剤Ｅ：ポリビニルアルコール（クラレ製、ＰＶＡ２０５）
Treatment agent A: polyethylene wax emulsion (San Nopco, Nopcoat PEM-17)
Treatment agent B: Mixture of 50 parts by weight of polyethylene wax emulsion (San Nopco, Nopcoat PEM-17) and 50 parts by weight of polyvinyl alcohol (Kuraray, PVA205) Treatment agent C: Polyethylene wax emulsion (Nikka Chemical, Santor) P-40)
Treatment agent D: Polyethylene wax emulsion (Meisei Chemical Co., Ltd., Maycatex HP-70)
Treatment agent E: Polyvinyl alcohol (Kuraray, PVA205)
〔評価〕
各実施例及び比較例の表面保護シートについて、下記方法により表面保護性能を評価した。その結果を下記表１に示す。尚、評価対象の各シートは、評価前にＪＩＳ Ｐ−８１１１に準じて処理を行なった後、評価に供した。
[Evaluation]
About the surface protection sheet of each Example and the comparative example, the surface protection performance was evaluated by the following method. The results are shown in Table 1 below. In addition, each sheet | seat of evaluation object processed for according to JISP-8111 before evaluation, and used for evaluation.
＜表面保護性能の評価方法＞
評価対象の表面保護シートを７枚用意し、その７枚のシートと、該シートと平面視形状が同形状同寸法の６枚の薄板状の保護対象物とを、それらの厚み方向に交互に積層し、その積層物を、該厚み方向（積層方向）を垂直方向に一致させて平坦な床の上に載置し、温度２３℃湿度５０％ＲＨの環境下に１６時間放置した。その後、６枚の保護対象物のうち最上部に位置するものを除き、残りの５枚の保護対象物それぞれの表面（表面保護シートとの接触面）を、ＪＩＳ Ｋ−５６００−５−４による鉛筆硬度試験に準じて、所定の鉛筆（３Ｈ）を使用して、７．３５Ｎ（７５０ｇ重）の荷重をかけつつ引っ掻いた。鉛筆で引っ掻いた後の各保護対象物の表面を目視で観察し、それら表面の全てに傷又は圧痕を確認できなかった場合を○、５枚の保護対象物のうち１〜２枚の表面にのみ傷又は圧痕が確認された場合を△、それ以外の場合を×とした。保護対象物としては、クラウンガラス板（松浪硝子製S9111）、ソーダガラス板（松浪硝子製S9213）、無アルカリガラス板（富士理科工業製TF-2K）、ステンレス板（SUS403鏡面加工品）、銅板（C1100P鏡面加工品）を用いた。
<Evaluation method of surface protection performance>
Seven surface protection sheets to be evaluated are prepared, and the seven sheets and six thin plate-shaped protection objects having the same shape and the same size as the planar view are alternately arranged in the thickness direction. The laminate was placed on a flat floor with the thickness direction (lamination direction) aligned with the vertical direction, and left in an environment of a temperature of 23 ° C. and a humidity of 50% RH for 16 hours. After that, except for the top 6 of the 6 objects to be protected, the surface of each of the remaining 5 objects to be protected (contact surface with the surface protection sheet) is in accordance with JIS K-5600-5-4. According to the pencil hardness test, a predetermined pencil (3H) was used to scratch while applying a load of 7.35 N (750 g weight). When the surface of each protection object after scratching with a pencil is visually observed, and when scratches or indentations cannot be confirmed on all of the surfaces, ○ on the surface of 1 to 2 of the 5 protection objects The case where only scratches or indentations were confirmed was indicated by Δ, and the case other than that was indicated by ×. As protection objects, crown glass plate (S9111 made by Matsunami Glass), soda glass plate (S9213 made by Matsunami Glass), alkali-free glass plate (TF-2K made by Fuji Science & Technology), stainless steel plate (SUS403 mirror finished product), copper plate (C1100P mirror finished product) was used.
表１に示す通り、各実施例は、保護対象物の傷発生防止能を向上させることができ、表面保護性能に優れるものであった。また、実施例１については、保護対象物として３種のガラス板の他に、鏡面光沢を有する２種の金属板を用いたところ、いずれの保護対象物に対しても高い表面保護性能を発揮した。これに対し、比較例１は、処理剤を一切付与していない単なるクラフト紙であるため、各実施例に比して表面保護性能に劣る結果となった。また比較例２は、処理剤は付与されているものの、その付与量が少ないため、各実施例に比して表面保護性能に劣る結果となった。また比較例３は、付与量は実施例１と同じであるが、付与剤にポリエチレンが含まれていないため、各実施例に比して表面保護性能に劣る結果となった。以上の結果から、保護対象物（ガラス、金属）の傷発生防止能を向上させるためには、「繊維を主体とする支持体に、ポリエチレンを主体とする表面保護機能付与剤を固形量換算で０．１ｇ／ｍ2以上付与する」ことが有効であることがわかる。 As shown in Table 1, each example was able to improve the ability to prevent scratches on the object to be protected, and was excellent in surface protection performance. Moreover, about Example 1, when using 2 types of metal plates which have specular gloss in addition to 3 types of glass plates as protection objects, high surface protection performance is demonstrated to any protection objects. did. On the other hand, since Comparative Example 1 is a mere kraft paper to which no treatment agent is applied, the surface protection performance is inferior to each example. In Comparative Example 2, although the treatment agent was applied, since the amount applied was small, the surface protection performance was inferior to that of each Example. In Comparative Example 3, the applied amount was the same as that in Example 1, but the result was inferior in surface protection performance compared to each Example because polyethylene was not included in the imparting agent. From the above results, in order to improve the ability to prevent the occurrence of scratches on the object to be protected (glass, metal), a “surface-protecting function-imparting agent mainly composed of polyethylene is added to the support composed mainly of fibers in terms of solid amount. It can be seen that it is effective to apply 0.1 g / m 2 or more.
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