JP4761025B2 - Heat sensitive stencil paper - Google Patents
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本発明は熱エネルギーにより製版する感熱孔版原紙に関し、詳しくはインクの透過が均一で画質が向上した感熱孔版原紙に関する。 The present invention relates to a heat-sensitive stencil sheet that makes a plate by heat energy, and more particularly to a heat-sensitive stencil sheet that has uniform ink permeation and improved image quality.
感熱孔版原紙は、通常、インク透過性の多孔性支持体である薄葉紙上に、インク不透過性の熱可塑性樹脂フィルムを直接または接着剤を介して貼り合わせた原紙からなり、この原紙のフィルム面に熱エネルギーを加えてフィルムを溶融穿孔し、所望の文字、図形等の版を作成し、この版を用いて印刷するものである。この製版方法として、サーマルヘッドによるデジタル製版方法と、赤外線やキセノンフラッシュ光を照射する方法が既に知られている。特に、サーマルヘッドによるデジタル製版法は静電複写（ＰＰＣ）と比較して、多数枚印刷時の印刷コストが安いこと、高速印刷が可能であること等の利点を有するため、急速に普及している。 The heat-sensitive stencil sheet is usually composed of a base paper in which an ink-impermeable thermoplastic resin film is bonded directly or via an adhesive on a thin paper that is an ink-permeable porous support. Heat energy is applied to the film to melt and perforate the film to produce a plate of desired characters, figures, etc., and this plate is used for printing. As this plate making method, a digital plate making method using a thermal head and a method of irradiating infrared rays or xenon flash light are already known. In particular, the digital plate-making method using a thermal head has advantages such as low printing cost when printing a large number of sheets and high-speed printing as compared with electrostatic copying (PPC). Yes.
しかし、従来使用されている感熱孔版原紙用の支持体は前述のように薄葉紙であることが多く、薄葉紙中の繊維密度のバラツキに起因して、インクの透過が均一でなく、形成した画像に印字されていない部分、いわゆる白ぬけという現象が生じ、画質が劣化するという問題点があった。 However, the support for heat-sensitive stencil paper that has been used in the past is often thin paper as described above, and due to variations in fiber density in the thin paper, the ink permeation is not uniform, resulting in a formed image. There is a problem in that the image quality deteriorates due to the phenomenon of so-called whitening, which is not printed.
この対策として、捲縮加工した合成繊維を薄葉紙に含有させることで、印刷の障害となる結束繊維を生じないようにするとともに、薄葉紙中の空隙が均一となるようにして、印刷を鮮明にする感熱孔版原紙が提案されている（特許文献１）。 As a countermeasure against this, by adding crimped synthetic fibers to the thin paper, not only the binding fibers that obstruct the printing are generated, but also the gaps in the thin paper are made uniform to make the printing clear. A heat-sensitive stencil sheet has been proposed (Patent Document 1).
一方、薄葉紙を用いる代わりに、多孔質樹脂層を熱可塑性樹脂フィルム上に設けることにより画質を向上させることが提案されている（特許文献２）。
特許文献１には繊維を捲縮加工する方法として、乾式法および湿式法が記載されている。乾式法とは合成繊維に主に用いられており、繊維の可塑性を利用し、繊維トウを２枚のギアの間を通したり、ローラーで箱の中に押しつけて機械的に捲縮を施す方法である。一方、湿式法とは製造工程において化学的に繊維に歪を与える方法であり、たとえば、レーヨン繊維ではビスコースを低酸性の第１浴で紡糸し、次いで高温の微酸性の第２浴中で引き延ばし、切断後に水または熱水中で捲縮を生じさせる方法である。 Patent Document 1 describes a dry method and a wet method as methods for crimping fibers. The dry method is mainly used for synthetic fibers, and utilizes the plasticity of the fiber to mechanically crimp the fiber tow by passing it between two gears or pressing it into a box with a roller. It is. On the other hand, the wet method is a method of chemically straining the fiber in the manufacturing process. For example, in the case of rayon fiber, viscose is spun in a low acid first bath and then in a high temperature slightly acid second bath. This is a method of drawing and crimping in water or hot water after cutting.
しかし、上記のような捲縮加工の方法では、均一に繊維を捲縮（カール）させることはできないため、画質の飛躍的な向上にはつながらない。さらに捲縮加工された繊維を、薄葉紙の他の繊維と混抄させなければならないので、薄葉紙中に捲縮繊維を均一に混抄させることは困難であり、混抄の段階で捲縮加工された繊維に他の繊維が絡んでかえって結束繊維を生じ、密度が不均一になるおそれがある。 However, the crimping method as described above cannot crimp the fibers uniformly and does not lead to a dramatic improvement in image quality. Further, since the crimped fiber must be mixed with other fibers of the thin paper, it is difficult to uniformly mix the crimped fibers in the thin paper. Other fibers may be entangled to form a bundled fiber, and the density may be uneven.
また、特許文献２に記載されているように多孔質樹脂層を設けた場合、孔版原紙にコシがなくなるため取り扱いが悪くなる。その対策として多孔質樹脂層の上に、さらに薄葉紙を設けることも考えられるが、そうした場合であっても薄葉紙の繊維密度のバラツキによって画質が悪化する。また製品のコストアップにもつながる。 In addition, when a porous resin layer is provided as described in Patent Document 2, the stencil sheet is not stiff and handling is poor. As a countermeasure, it is conceivable to further provide a thin paper on the porous resin layer, but even in such a case, the image quality deteriorates due to variations in the fiber density of the thin paper. It also leads to increased product costs.
本発明は上記問題点を解決するためになされたものであって、インクの透過が均一であり、画質を向上させた感熱孔版原紙を提供することを目的とする。また、製版時にシワが生じづらいコシのある感熱孔版原紙を提供することを目的とする。 The present invention has been made to solve the above problems, and an object of the present invention is to provide a heat-sensitive stencil sheet having uniform ink permeation and improved image quality. It is another object of the present invention to provide a heat-sensitive stencil sheet that is not easily wrinkled during plate making.
本発明者は、潜在捲縮発現性繊維を含んだ薄葉紙を用いることによって、インクの透過が均一になり、画質を向上させること、およびシワが生じにくいコシのある感熱孔版原紙が得られることを見出し、本発明を完成させるに至った。 The present inventor has found that by using thin paper containing latent crimp-expressing fibers, the permeation of the ink becomes uniform, the image quality is improved, and a heat-sensitive stencil sheet that is stiff and does not easily wrinkle is obtained. The headline and the present invention have been completed.
すなわち、本発明の感熱孔版原紙は、薄葉紙とインク不透過性の熱可塑性樹脂フィルムとを貼り合せてなり、薄葉紙が潜在捲縮発現性繊維を含むことを特徴とする。 That is, the heat-sensitive stencil sheet of the present invention is characterized in that a thin paper and an ink-impermeable thermoplastic resin film are bonded together, and the thin paper contains latent crimp-expressing fibers.
本発明においては、潜在捲縮発現性繊維がポリエステルのサイドバイサイド型であることが好ましい。また、ＪＩＳ Ｌ−１０１５−１９９２ ７−１２−１に基づいて測定された潜在捲縮発現性繊維の捲縮数が、１５〜４０個／２５ｍｍであることが好ましい。さらに、薄葉紙中の全繊維に対し、潜在捲縮発現性繊維が１０重量％〜６０重量％含まれていることが好ましい。 In the present invention, the latent crimp-expressing fiber is preferably a polyester side-by-side type. Moreover, it is preferable that the number of crimps of the latent crimp expression fiber measured based on JISL-1015-19927-12-1 is 15-40 pieces / 25mm. Furthermore, it is preferable that 10% by weight to 60% by weight of latent crimp-forming fiber is contained with respect to all the fibers in the thin paper.
潜在捲縮発現性繊維とは２成分以上の物質を貼り合せた構造を有し、通常の状態では捲縮していないが、熱を加えることにより捲縮が発現するもので、繊維自身が捲縮性を有している繊維のことを言い、通常の仮撚加工糸とは区別されるものである。このような潜在捲縮発現性繊維は、異なる成分をそれぞれ２つに仕切られたノズルから同時に紡糸し、ノズル吐出部で両者を混合することなく合わせて１本の糸にすることで製造される。 A latent crimp-expressing fiber has a structure in which two or more components are bonded together, and is not crimped in a normal state, but crimps are developed by applying heat. This refers to a fiber having compressibility, and is distinguished from ordinary false twisted yarn. Such latent crimp-expressing fibers are produced by simultaneously spinning different components from two separate nozzles and combining them into a single yarn without mixing them at the nozzle discharge section. .
このように潜在捲縮発現性繊維は、薄葉紙を他の繊維と混抄する工程においては捲縮しておらず、薄葉紙とするために熱処理を行った段階で初めて捲縮が現れる。このため、捲縮していない段階で薄葉紙を他の繊維と混抄することができるため、薄葉紙中に潜在捲縮発現性繊維を均一に混抄させることができる。 In this way, the latent crimp-expressing fibers are not crimped in the process of blending the thin paper with other fibers, and crimps appear only when heat treatment is performed to obtain thin paper. For this reason, since a thin paper can be mixed with another fiber in the stage which is not crimped, a latent crimp expression fiber can be uniformly mixed in a thin paper.
さらに、特許文献１に記載されている捲縮の加工方法では、捲縮される繊維にバラツキが生じてしまうが、潜在捲縮発現性繊維は繊維自身が捲縮を発現するように加工されているため確実に捲縮が生じ、均一に捲縮した繊維を有する薄葉紙を得ることができる。 Furthermore, in the crimping processing method described in Patent Document 1, variation occurs in the crimped fiber, but the latent crimp-expressing fiber is processed so that the fiber itself exhibits crimp. Therefore, crimping occurs reliably, and a thin paper having uniformly crimped fibers can be obtained.
本発明の感熱孔版原紙によれば、以下のような効果を得ることができる。
（１）インクが均一に透過するため、印刷にムラがない。
（２）繊細な部分まで印刷でき、極め細やかな画像が得られる。
（３）捲縮繊維を含有した均一な密度の薄葉紙を有する感熱孔版原紙を容易に製造できる。
（４）捲縮繊維を薄葉紙に均一に含有させることにより、感熱孔版原紙自体のコシが増し、製版時にシワが生じにくい。
According to the heat-sensitive stencil sheet of the present invention, the following effects can be obtained.
(1) Since the ink is transmitted uniformly, there is no unevenness in printing.
(2) It is possible to print up to a delicate part and obtain an extremely fine image.
(3) A heat-sensitive stencil sheet having a uniform density thin paper containing crimped fibers can be easily produced.
(4) By containing the crimped fibers uniformly in the thin paper, the stiffness of the heat-sensitive stencil sheet itself increases, and wrinkles are less likely to occur during plate making.
本発明の感熱孔版原紙は、潜在捲縮発現性繊維が含まれた薄葉紙と、インク不透過性の熱可塑性樹脂フィルムとを貼り合せた構造を有する。 The heat-sensitive stencil sheet of the present invention has a structure in which a thin paper containing latent crimpable fibers and an ink-impermeable thermoplastic resin film are bonded together.
本発明にかかる潜在捲縮発現性繊維は、上述したように、２成分以上の物質を貼り合せた構造を有する繊維で、熱を加えることにより捲縮する繊維である。特に本発明においては、図１に示すような、低収縮性ポリエステル成分と高収縮性ポリエステル成分とからなるサイドバイサイド型潜在捲縮発現性繊維が、製版時の熱安定性の点から好ましい。このサイドバイサイド型潜在捲縮発現性繊維は熱処理することによって、両ポリエステル成分に収縮差が生じ、捲縮を発現するものである。 The latent crimp-expressing fiber according to the present invention is a fiber having a structure in which two or more components are bonded as described above, and is a fiber that is crimped by applying heat. In particular, in the present invention, a side-by-side latent crimp-expressing fiber composed of a low-shrinkage polyester component and a high-shrinkage polyester component as shown in FIG. 1 is preferable from the viewpoint of thermal stability during plate making. When this side-by-side type latent crimp-expressing fiber is heat-treated, a shrinkage difference occurs between both polyester components, and crimps are expressed.
本発明における好ましい潜在捲縮発現性繊維としては、クラレ製NONWOVEN PN792、ユニチカ製38F、38Y、38K、H38F、H38Y、H18Ｘ等が挙げられる。 Preferred latent crimp-expressing fibers in the present invention include Kuraray NONWOVEN PN792, Unitika 38F, 38Y, 38K, H38F, H38Y, H18X, and the like.
潜在捲縮発現性繊維の捲縮数は１５〜４０個/２５ｍｍ、中でも１８〜３５個/２５ｍｍであることが好ましい。捲縮数が１５個/２５ｍｍより小さいと、薄葉紙全体における繊維密度を均一にすることができず、画質の向上につながらない。また、感熱孔版原紙自体のコシを付与する効果が小さくなる。一方、捲縮数が４０より大きいと毛管現象を起こしやすくなってインクの透過量が減り、画質が劣化するからである。 The number of crimps of the latent crimp-expressing fiber is preferably 15 to 40/25 mm, more preferably 18 to 35/25 mm. If the number of crimps is less than 15/25 mm, the fiber density in the entire thin paper cannot be made uniform, and the image quality is not improved. Further, the effect of imparting stiffness to the heat-sensitive stencil sheet itself is reduced. On the other hand, if the number of crimps is greater than 40, capillary action is likely to occur, the amount of ink transmitted decreases, and the image quality deteriorates.
潜在捲縮発現性繊維の含有量は、薄葉紙の全線維に対して、１０重量％〜６０重量％であることが好ましい。１０重量％より少ないと、薄葉紙全体における繊維密度を均一にすることができず、画質の向上につながらない。また、感熱孔版原紙自体のコシを付与する効果が小さくなる。一方、６０重量％より大きいと毛管現象を起こしやすくなってインクの透過量が減り、画質が劣化するからである。 The content of the latent crimp-expressing fiber is preferably 10% by weight to 60% by weight with respect to the total fibers of the thin paper. If it is less than 10% by weight, the fiber density in the whole thin paper cannot be made uniform, and the image quality is not improved. Further, the effect of imparting stiffness to the heat-sensitive stencil sheet itself is reduced. On the other hand, if the amount is more than 60% by weight, a capillary phenomenon is liable to occur, the amount of ink permeation decreases, and the image quality deteriorates.
本発明に用いられる薄葉紙を形成する材料としては、こうぞ、みつまた、マニラ麻、木材繊維等の天然繊維、およびレーヨン、ビニロン、ポリエステル、ポリアクリロニトリル等の合成繊維を、単独でまたは組み合わせて使用することができる。 As materials for forming the thin paper used in the present invention, natural fibers such as ridges, honey or manila hemp, wood fibers, and synthetic fibers such as rayon, vinylon, polyester, polyacrylonitrile, etc., may be used alone or in combination. Can do.
本発明に用いられるインク不透過性の熱可塑性樹脂フィルムとしては、熱可塑性樹脂フィルムであって、インク不透過性であればよく、公知のものを使用することができる。たとえば、ポリエステルフィルム、ポリエステル共重合フィルム、塩化ビニルフィルム、ポリプロピレンフィルム、塩化ビニル・ビニリデン共重合フィルム等が挙げられる。フィルムは０．５〜６．０μｍの厚さのものが好ましい。厚さが０.５μｍ未満だとフィルムにコシがなくなり、耐刷性が悪くなる。また、厚さが６μｍより大きいと、熱可塑性樹脂フィルムに穿孔を形成しにくい。さらに、穿孔を形成するためのサーマルヘッド等のエネルギーを大きくしなければならず、ヘッドの負荷が大きくなる。 The ink-impermeable thermoplastic resin film used in the present invention is a thermoplastic resin film as long as it is ink-impermeable, and known ones can be used. Examples thereof include a polyester film, a polyester copolymer film, a vinyl chloride film, a polypropylene film, and a vinyl chloride / vinylidene copolymer film. The film preferably has a thickness of 0.5 to 6.0 μm. When the thickness is less than 0.5 μm, the film is not stiff and the printing durability is deteriorated. On the other hand, if the thickness is larger than 6 μm, it is difficult to form perforations in the thermoplastic resin film. Furthermore, the energy of the thermal head or the like for forming the perforations must be increased, which increases the load on the head.
薄葉紙と熱可塑性樹脂フィルムとを貼り合わせるのに用いる接着剤としては、たとえば、酢酸ビニル樹脂、塩化ビニル酢酸ビニル共重合樹脂、ポリエステル樹脂、ウレタン樹脂、ポリアミド樹脂、塩素化ポリプロピレン樹脂、アクリル樹脂、スチレン樹脂、スチレンマレイン酸樹脂、ポリビニルアルコール樹脂等の樹脂が挙げられるが、印刷に使用するインクに溶解しない樹脂を選択して使用すればよい。また、これらに必要に応じて他の添加剤、例えば、帯電防止剤、潤滑剤、顔料等を添加してもよい。 Examples of the adhesive used to bond the thin paper and the thermoplastic resin film include, for example, vinyl acetate resin, vinyl chloride vinyl acetate copolymer resin, polyester resin, urethane resin, polyamide resin, chlorinated polypropylene resin, acrylic resin, styrene A resin such as a resin, a styrene maleic acid resin, or a polyvinyl alcohol resin can be used, but a resin that does not dissolve in the ink used for printing may be selected and used. Moreover, you may add other additives, for example, an antistatic agent, a lubricant, a pigment, etc. to these as needed.
接着剤の塗布量は、薄葉紙と熱可塑性樹脂フィルムとを接着した後に実用上問題のない強度が得られる範囲であればよいが、好ましくは２ｇ／ｍ2 以下、より好ましくは０．３ｇ／ｍ2 〜１．０ｇ／ｍ2とするのが望ましい。 The application amount of the adhesive may be within a range in which a strength having no practical problem is obtained after bonding the thin paper and the thermoplastic resin film, but is preferably 2 g / m 2 or less, more preferably 0.3 g / m. 2 to 1.0 g / m 2 is desirable.
なお、本発明においては、感熱孔版原紙の融着防止のため、熱可塑性樹脂フィルムの薄葉紙と張り合わせる側と反対側の面上に耐熱保護層を設けてもよい。耐熱保護層は、界面活性剤、シリコン系、フッ素系等の離型性能のあるもので形成することができる。また、必要に応じてこれらに他の添加剤、例えば、帯電防止剤や滑剤等を添加してもよい。 In the present invention, in order to prevent the heat-sensitive stencil sheet from being fused, a heat-resistant protective layer may be provided on the surface of the thermoplastic resin film on the side opposite to the side to be laminated with the thin paper. The heat-resistant protective layer can be formed of a surface-active agent, silicon-based, fluorine-based or the like having a releasing performance. Moreover, you may add another additive, for example, an antistatic agent, a lubricant, etc. to these as needed.
感熱孔版原紙を製版するために用いる熱エネルギーとしては、サーマルヘッド等の発熱素子が挙げられる。 Examples of the heat energy used for making the heat-sensitive stencil sheet include a heating element such as a thermal head.
（感熱孔版原紙の作製）
[実施例１]
クラレ製NONWOVEN PN792（ポリエステル製サイドバイサイド型潜在捲縮発現性繊維）とマニラ麻とを重量比３５：６５で混抄し、乾燥させ薄葉紙を得た。この薄葉紙を１００℃で５分間加熱処理して、捲縮繊維を含有した約４０μｍの薄葉紙を作成した。なお、１００℃で５分間加熱した場合の、ＪＩＳ Ｌ−１０１５−１９９２ ７−１２−１に基づくクラレ製NONWOVEN PN792の捲縮数は１８．６個/２５ｍｍであった。
次に、薄葉紙と厚さ約１．８μｍのポリエステルフィルムとを、塩化ビニル−酢酸ビニル共重合体系の接着剤を、不揮発分として０．５ｇ／ｍ２用いて貼り合わせた。さらに、ポリエステルフィルムの薄葉紙との貼り合わせ面の反対側の面に、シリコンアクリルグラフト共重合体樹脂を０．０５ｇ／ｍ２の付着量となるように塗工して耐熱保護層を形成し、本発明にかかる感熱孔版原紙を作製した。
(Preparation of heat-sensitive stencil paper)
[Example 1]
Kuraray NONWOVEN PN792 (polyester side-by-side latent crimp-expressing fiber) and Manila hemp were mixed at a weight ratio of 35:65 and dried to obtain a thin paper. This thin paper was heat-treated at 100 ° C. for 5 minutes to prepare about 40 μm thin paper containing crimped fibers. The number of crimps of Kuraray's NONWOVEN PN792 based on JIS L-1015-1992 7-12-1 when heated at 100 ° C. for 5 minutes was 18.6 pieces / 25 mm.
Next, a thin paper and a polyester film having a thickness of about 1.8 μm were bonded together using an adhesive based on a vinyl chloride-vinyl acetate copolymer as a nonvolatile content of 0.5 g / m 2 . Furthermore, on the surface opposite to the surface of the polyester film bonded to the thin paper, a silicon acrylic graft copolymer resin is applied so as to have an adhesion amount of 0.05 g / m 2 to form a heat-resistant protective layer, A heat-sensitive stencil sheet according to the present invention was produced.
[実施例２]
実施例１における加熱処理を１３０℃で５分間とした以外は、実施例１と同様にして感熱孔版原紙を作製した。なお、この加熱処理条件によるクラレ製NONWOVEN PN792の捲縮数は２５．４個/２５ｍｍであった。
[Example 2]
A heat-sensitive stencil sheet was prepared in the same manner as in Example 1 except that the heat treatment in Example 1 was performed at 130 ° C. for 5 minutes. The number of crimps of Kuraray NONWOVEN PN792 under this heat treatment condition was 25.4 pieces / 25 mm.
[実施例３]
実施例１における加熱処理を１４０℃で５分間とした以外は、実施例１と同様にして感熱孔版原紙を作製した。なお、この加熱処理条件によるクラレ製NONWOVEN PN792の捲縮数は３５．２個/２５ｍｍであった。
[Example 3]
A heat-sensitive stencil sheet was prepared in the same manner as in Example 1 except that the heat treatment in Example 1 was performed at 140 ° C. for 5 minutes. The number of crimps of Kuraray NONWOVEN PN792 under this heat treatment condition was 35.2 pieces / 25 mm.
[実施例４]
実施例１における加熱処理を１５０℃で５分間とした以外は、実施例１と同様にして感熱孔版原紙を作製した。なお、この加熱処理条件によるクラレ製NONWOVEN PN792の捲縮数は３９．４個/２５ｍｍであった。
[Example 4]
A heat-sensitive stencil sheet was produced in the same manner as in Example 1 except that the heat treatment in Example 1 was changed to 150 ° C. for 5 minutes. Note that the number of crimps of Kuraray NONWOVEN PN792 under this heat treatment condition was 39.4 / 25 mm.
[実施例５]
実施例２における、クラレ製NONWOVEN PN792（潜在捲縮発現性繊維）とマニラ麻とを重量比を１０：９０として混抄した以外は、実施例２と同様にして感熱孔版原紙を作製した。
[Example 5]
A heat-sensitive stencil sheet was prepared in the same manner as in Example 2 except that Kuraray NONWOVEN PN792 (latent crimp-expressing fiber) and Manila hemp were mixed at a weight ratio of 10:90.
[実施例６]
実施例２における、クラレ製NONWOVEN PN792（潜在捲縮発現性繊維）とマニラ麻とを重量比を６０：４０として混抄した以外は、実施例２と同様にして感熱孔版原紙を作製した。
[Example 6]
A heat-sensitive stencil sheet was prepared in the same manner as in Example 2, except that Kuraray's NONWOVEN PN792 (latent crimp-expressing fiber) and Manila hemp were mixed at a weight ratio of 60:40.
[比較例１]
実施例２における、クラレ製NONWOVEN PN792（潜在捲縮発現性繊維）とマニラ麻とを重量比を０：１００、すなわち潜在捲縮発現性繊維を配合しない以外は、実施例２と同様にして感熱孔版原紙を作製した。
[Comparative Example 1]
Heat sensitive stencil in the same manner as in Example 2 except that the weight ratio of NONWOVEN PN792 (latent crimp-expressing fiber) and Manila hemp in Example 2 is 0: 100, that is, no latent crimp-expressing fiber is blended. A base paper was prepared.
[比較例２]
潜在捲縮発現性繊維を、２枚のギアの間に通すことにより捲縮させたポリエステル繊維（捲縮数１８．２個／２５mm）に変更し、ポリエステル繊維を捲縮処理後、マニラ麻と混抄した以外は実施例２と同様にして感熱孔版原紙を作製した。
[Comparative Example 2]
The latent crimpable fiber is changed to a polyester fiber crimped by passing it between two gears (crimp number: 18.2 pieces / 25 mm). After the polyester fiber is crimped, it is mixed with Manila hemp. A heat-sensitive stencil sheet was prepared in the same manner as in Example 2 except that.
[比較例３]
実施例２における加熱処理を９０℃で５分間とした以外は、実施例２と同様にして感熱孔版原紙を作製した。なお、この加熱処理条件によるクラレ製NONWOVEN PN792の捲縮数は１２．９個/２５ｍｍであった。
[Comparative Example 3]
A heat-sensitive stencil sheet was produced in the same manner as in Example 2 except that the heat treatment in Example 2 was performed at 90 ° C. for 5 minutes. The number of crimps of Kuraray NONWOVEN PN792 under this heat treatment condition was 12.9 pieces / 25 mm.
[比較例４]
実施例２における加熱処理を１６０℃で５分間とした以外は、実施例２と同様にして感熱孔版原紙を作製した。なお、この加熱処理条件によるクラレ製NONWOVEN PN792の捲縮数は４３．１個/２５ｍｍであった。
[Comparative Example 4]
A heat-sensitive stencil sheet was produced in the same manner as in Example 2 except that the heat treatment in Example 2 was performed at 160 ° C. for 5 minutes. The number of crimps of Kuraray NONWOVEN PN792 under this heat treatment condition was 43.1 pieces / 25 mm.
[比較例５]
実施例２における、クラレ製NONWOVEN PN792（潜在捲縮発現性繊維）とマニラ麻とを重量比を５：９５として混抄した以外は、実施例２と同様にして感熱孔版原紙を作製した。
[Comparative Example 5]
A heat-sensitive stencil sheet was prepared in the same manner as in Example 2 except that Kuraray NONWOVEN PN792 (latent crimp-expressing fiber) and Manila hemp were mixed at a weight ratio of 5:95.
[比較例６]
実施例２における、クラレ製NONWOVEN PN792（潜在捲縮発現性繊維）とマニラ麻とを重量比を７０：３０として混抄した以外は、実施例２と同様にして感熱孔版原紙を作製した。
[Comparative Example 6]
A heat-sensitive stencil sheet was prepared in the same manner as in Example 2 except that Kuraray NONWOVEN PN792 (latent crimp-expressing fiber) and Manila hemp were mixed at a weight ratio of 70:30.
（画質評価）
実施例１〜６および比較例１〜６で作製した感熱孔版原紙を、リコー製プリポート印刷機（ＶＴ−３８２０）を用いて、ヘッドのすべてのドットについて熱エネルギーを付与してフィルムに穿孔して製版した。次に、この版を用いてＰＰＣ用紙の全面に黒色印刷を行った。
(Image quality evaluation)
The heat-sensitive stencil sheets prepared in Examples 1 to 6 and Comparative Examples 1 to 6 were punched in a film by applying thermal energy to all the dots of the head using a Ricoh preport printing machine (VT-3820). Made a plate. Next, black printing was performed on the entire surface of the PPC paper using this plate.
得られた画像について、フィルムの穿孔部において、薄葉紙の密度の不均一から生じた密度の高い箇所が存在するか、もしくは薄葉紙全体の毛管現象が強すぎることによるインクの不透過を原因とする白抜けを観察し、画質の評価とした。評価基準は以下のとおりとした。結果を表１および表２に示す。
○：全く問題なし
△：わずかであるが白抜けが見られた。
×：白抜け多く見られた
In the obtained image, there is a high density portion resulting from the non-uniformity of the thin paper at the perforated portion of the film, or the whiteness caused by the impermeability of the ink due to excessive capillary action of the entire thin paper. The missing image was observed to evaluate the image quality. The evaluation criteria were as follows. The results are shown in Tables 1 and 2.
○: No problem at all Δ: Slightly white spots were observed.
×: Many white spots were seen
（感熱孔版原紙のコシの評価）
実施例１〜６および比較例１〜６で作製した感熱孔版原紙を、リコー製プリポート印刷機（ＶＴ−３８２０）を用いて穿孔することで製版した。得られた版を使用してＰＰＣ用紙２０枚に印刷した後、各感熱孔版原紙の表面のシワを顕微鏡で観察した。これをＮ＝１００行うことにより感熱孔版原紙自体のコシを評価した。評価基準は以下のとおりとした。結果を表１および表２に示す。
○：全くシワが見られなかった。
△：１００枚中１〜２枚の割合で、わずかなシワが見られた。
×：１００枚中３枚以上の割合で、シワが見られた。
(Evaluation of stiffness of heat-sensitive stencil paper)
The heat-sensitive stencil sheets prepared in Examples 1 to 6 and Comparative Examples 1 to 6 were made by punching using a Ricoh preport printer (VT-3820). After printing on 20 PPC sheets using the obtained plate, the surface of each heat-sensitive stencil sheet was observed with a microscope. The stiffness of the heat-sensitive stencil sheet itself was evaluated by N = 100. The evaluation criteria were as follows. The results are shown in Tables 1 and 2.
○: Wrinkles were not seen at all.
Δ: Slight wrinkles were observed at a ratio of 1 to 2 out of 100 sheets.
X: Wrinkles were observed at a ratio of 3 or more out of 100 sheets.
（評価結果の考察）
比較例１と実施例１〜６とを比較することにより、薄葉紙中に捲縮繊維を含有させることで画質および感熱孔版原紙のコシを向上できることが確認できた。
(Consideration of evaluation results)
By comparing Comparative Example 1 and Examples 1 to 6, it was confirmed that the image quality and the stiffness of the heat-sensitive stencil sheet could be improved by including crimped fibers in the thin paper.
また、実施例１〜６と、２枚のギアの間に通すことにより繊維を捲縮させたポリエステル繊維を使用した比較例２とを比較することにより、潜在捲縮発現性繊維を熱処理することにより繊維を捲縮させた方が均一に繊維を捲縮できること、さらに、薄葉紙を他の繊維と混抄した後に繊維を捲縮できることから、結束繊維が生じにくく、潜在捲縮発現性繊維と他の繊維を均一に混抄できることにより、画質および感熱孔版原紙のコシを向上できることが確認できた。 Moreover, heat-treating latent crimpable fibers by comparing Examples 1 to 6 with Comparative Example 2 using polyester fibers in which the fibers are crimped by passing between two gears. The fibers can be crimped more uniformly by crimping the fibers, and further, the fibers can be crimped after blending the thin paper with other fibers. It was confirmed that the image quality and the stiffness of the heat-sensitive stencil paper can be improved by uniformly mixing the fibers.
さらに、実施例１〜６ならびに比較例３および４を比較して、捲縮数は１５〜４０個／２５ｍｍが好ましく、実施例１〜６ならびに比較例５および６を比較して、薄葉紙中の潜在捲縮発現性繊維の含有量は１０〜６０重量％が好ましいことが分かった。 Further, comparing Examples 1 to 6 and Comparative Examples 3 and 4, the number of crimps is preferably 15 to 40 pieces / 25 mm. Compared to Examples 1 to 6 and Comparative Examples 5 and 6, It was found that the content of the latent crimp-expressing fiber is preferably 10 to 60% by weight.
Claims (1)
サイドバイサイド型ポリエステルであり、
捲縮数（ＪＩＳ Ｌ−１０１５−１９９２ ７−１２−１）が１５〜４０個／２５ｍｍであり、
薄葉紙中の全繊維に対し、１０重量％〜６０重量％含まれている、
ことを特徴とする感熱孔版原紙。 In a heat-sensitive stencil sheet obtained by laminating a thin paper containing latent crimp-expressing fibers and an ink-impermeable thermoplastic resin film, the latent crimp-expressing fibers are:
Side-by-side polyester,
The number of crimps (JIS L-1015-1992 7-12-1) is 15-40 pieces / 25 mm,
10% to 60% by weight based on the total fibers in the tissue paper,
A heat-sensitive stencil sheet characterized by that.
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