JP2013063566A - Thermal stencil paper - Google Patents

Thermal stencil paper Download PDF

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JP2013063566A
JP2013063566A JP2011203199A JP2011203199A JP2013063566A JP 2013063566 A JP2013063566 A JP 2013063566A JP 2011203199 A JP2011203199 A JP 2011203199A JP 2011203199 A JP2011203199 A JP 2011203199A JP 2013063566 A JP2013063566 A JP 2013063566A
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porous support
resin film
thermoplastic resin
adhesive
heat
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Shinichi Ezure
真市 江連
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Riso Kagaku Corp
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Riso Kagaku Corp
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Abstract

PROBLEM TO BE SOLVED: To secure the sufficient adhesive strength of thermal stencil paper with a small amount of coating, and to suppress a punching failure.SOLUTION: The thermal stencil paper is constituted so that a thermoplastic resin film 1 is bonded to a porous support 3 via an adhesive 2 and a release agent layer 4 is further provided to the thermoplastic resin film 1. The porous support 3 is subjected to hydrophilic treatment prior to the bonding of the thermoplastic resin film 1.

Description

本発明は、感熱孔版原紙に関するものである。   The present invention relates to a heat-sensitive stencil sheet.

感熱孔版原紙(マスター)は、ポリエステル系フィルム、塩化ビニリデン系フィルム等の熱可塑性樹脂フィルムと、天然繊維や合成繊維を主成分とする薄葉紙、不織布、織物等からなる多孔性支持体とを含み、両者を接着剤で貼り合わせた構成のものが知られている。感熱孔版原紙は、熱可塑性樹脂フィルムの印字(画像)部分が、サーマルヘッド等によりドット状に穿孔され、版として使用される。   The heat-sensitive stencil sheet (master) includes a thermoplastic resin film such as a polyester-based film and a vinylidene chloride-based film, and a porous support made of a thin paper, a nonwoven fabric, a woven fabric or the like mainly composed of natural fibers or synthetic fibers, The thing of the structure which bonded both with the adhesive agent is known. The heat-sensitive stencil sheet is used as a plate in which a print (image) portion of a thermoplastic resin film is perforated into dots by a thermal head or the like.

熱可塑性樹脂フィルムと多孔性支持体を貼り合わせる接着剤としては、溶剤系(または水系)接着剤(例えば特許文献1)、硬化型接着剤(例えば特許文献2,3)等が知られている。いずれの接着剤を用いるにしても接着剤塗工量が多いと穿孔を阻害し穿孔不良の原因となるため、近年の高精細化にともない、接着剤塗工量をより少なくする必要がある。さらに、接着剤は均一に塗工することが望ましいが、接着剤は概ね粘性をもつ液体であるため塗工量の多い箇所が局在し、このことも穿孔不良の原因となる。   Known adhesives for bonding a thermoplastic resin film and a porous support include solvent-based (or water-based) adhesives (for example, Patent Document 1), curable adhesives (for example, Patent Documents 2 and 3), and the like. . Regardless of which adhesive is used, if the adhesive coating amount is large, the perforation is hindered to cause a perforation failure. Therefore, it is necessary to reduce the adhesive coating amount with the recent high definition. Further, it is desirable that the adhesive is applied uniformly, but since the adhesive is a liquid having a viscosity in general, a portion with a large amount of application is localized, which also causes a perforation failure.

多孔性支持体と熱可塑性樹脂フィルムとの接着結束点に起因する穿孔不良や、接着剤の局在により熱可塑性樹脂フィルム面に発生する穿孔不良を改善する手段として、特許文献4には、片方の面に接着剤を一定量塗布した多孔性支持体を、鏡面ロール上に密着保持された熱可塑性樹脂フィルム上に密着させ、これを一体で移動させる間に鏡面ロール上で接着剤を硬化させ、熱可塑性樹脂フィルムと多孔性支持体の平滑面が保持されている間に貼り合わせと同時に硬化を完了させることにより、感熱孔版原紙の平滑性を向上させることが記載されている。   As a means for improving the perforation failure caused by the bonding and binding point between the porous support and the thermoplastic resin film and the perforation failure occurring on the surface of the thermoplastic resin film due to the localization of the adhesive, Patent Document 4 discloses that A porous support with a predetermined amount of adhesive applied to the surface is closely attached to a thermoplastic resin film held in close contact with the mirror surface roll, and the adhesive is cured on the mirror surface roll while it is moved together. Further, it is described that the smoothness of the heat-sensitive stencil sheet is improved by completing the curing simultaneously with the bonding while the smooth surface of the thermoplastic resin film and the porous support is held.

特公昭47−1188号公報Japanese Patent Publication No.47-1188 特開昭61−286131号公報JP-A 61-286131 特開平5−212984号公報Japanese Patent Laid-Open No. 5-212984 特開2001−18552号公報JP 2001-18552 A

特許文献4に記載されている方法によれば、感熱孔版原紙のフィルム面の平滑性の低さに起因する穿孔不良は改善できるものの、接着強度を確保するため、接着剤の塗工量そのものを低減することは難しい。また、熱可塑性樹脂フィルムの表面には、通常、サーマルヘッド等との融着防止のために剥離剤が設けられているが、感熱孔版原紙を重なった状態で長期間放置すると、重なった下側の感熱孔版原紙の剥離剤が上側の感熱孔版原紙の多孔性支持体と接し、徐々に剥離剤が上側に重なる多孔性支持体へ移行してしまうという問題がある。剥離剤が低減した熱可塑性樹脂フィルムは、サーマルヘッドに付着しやすくなり、穿孔不良の原因になることがある。   According to the method described in Patent Document 4, although the perforation failure due to the low smoothness of the film surface of the heat-sensitive stencil sheet can be improved, the coating amount of the adhesive itself is used to ensure the adhesive strength. It is difficult to reduce. In addition, a release agent is usually provided on the surface of the thermoplastic resin film to prevent fusion with a thermal head or the like. There is a problem that the release agent of the heat-sensitive stencil sheet comes in contact with the porous support of the upper heat-sensitive stencil sheet, and the release agent gradually moves to the porous support on the upper side. A thermoplastic resin film with a reduced release agent tends to adhere to the thermal head and may cause poor perforation.

本発明は上記事情に鑑みなされたものであり、少ない接着剤塗工量で十分な接着強度を確保できるとともに、穿孔不良を抑制することが可能な感熱孔版原紙を提供することを目的とするものである。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat-sensitive stencil sheet that can secure sufficient adhesive strength with a small amount of adhesive coating and can suppress perforation failure. It is.

本発明の感熱孔版原紙は、多孔性支持体に接着剤を介して熱可塑性樹脂フィルムが貼り合わせられ、該熱可塑性樹脂フィルム上にさらに剥離剤層が設けられた感熱孔版原紙であって、前記多孔性支持体を、前記熱可塑性樹脂フィルムに貼り合わせられる前に親水化処理したものであることを特徴とするものである。
前記多孔性支持体が前記熱可塑性樹脂フィルムに貼り合わせられた後に、前記多孔性支持体の前記熱可塑性樹脂フィルムが貼り合わせられていない面を疎水化処理したものであることがより好ましい。
The heat-sensitive stencil sheet of the present invention is a heat-sensitive stencil sheet in which a thermoplastic resin film is bonded to a porous support via an adhesive, and a release agent layer is further provided on the thermoplastic resin film, The porous support is obtained by hydrophilization before being bonded to the thermoplastic resin film.
More preferably, the surface of the porous support on which the thermoplastic resin film is not bonded is subjected to a hydrophobic treatment after the porous support is bonded to the thermoplastic resin film.

前記親水化処理はコロナ放電であることが好ましい。
前記疎水化処理はシリコーン系撥水剤またはフッ素系撥水剤による処理であることが好ましい。
The hydrophilization treatment is preferably corona discharge.
The hydrophobic treatment is preferably a treatment with a silicone water repellent or a fluorine water repellent.

本発明の感熱孔版原紙は、多孔性支持体に接着剤を介して熱可塑性樹脂フィルムが貼り合わせられ、熱可塑性樹脂フィルム上にさらに剥離剤層が設けられた感熱孔版原紙であって、多孔性支持体が、熱可塑性樹脂フィルムに貼り合わせられる前に親水化処理したものであるので、多孔性支持体と熱可塑性樹脂フィルムの接着強度が高まり、接着剤量を低減しても十分な接着が可能となる。そして、接着剤量を低減することができるため、接着剤量の多いところが局在しても、穿孔不良が発生するほどの量ではないため、穿孔不良は抑制される。また、熱可塑性樹脂フィルムに塗工された接着剤が多孔性支持体との接着点に集中するため接着強度が向上するとともに、熱可塑性樹脂フィルム側に残る接着剤は減少するため穿孔不良を低減することができる。   The heat-sensitive stencil sheet of the present invention is a heat-sensitive stencil sheet in which a thermoplastic resin film is bonded to a porous support via an adhesive, and a release agent layer is further provided on the thermoplastic resin film. Since the support is hydrophilized before being bonded to the thermoplastic resin film, the adhesive strength between the porous support and the thermoplastic resin film is increased, and sufficient adhesion is achieved even if the amount of adhesive is reduced. It becomes possible. And since the amount of adhesives can be reduced, even if the place where the amount of adhesives is large is localized, it is not an amount that will cause perforation failures, so that perforation failures are suppressed. In addition, the adhesive applied to the thermoplastic resin film concentrates on the adhesive point with the porous support, improving the adhesive strength, and reducing the adhesive remaining on the thermoplastic resin film side, thereby reducing poor perforations. can do.

また、多孔性支持体が熱可塑性樹脂フィルムに貼り合わせられた後に、多孔性支持体の熱可塑性樹脂フィルムが貼り合わせられていない面を疎水化処理したものとすることによって、感熱孔版原紙を重なった状態、すなわち感熱孔版原紙の剥離剤と感熱孔版原紙の多孔性支持体とが接する状態で長期間放置しても、剥離剤が多孔性支持体へ移行しにくくなり、長期間経過しても剥離剤としての機能がそこなわれることがないため、サーマルヘッドへの融着がおこりにくく、穿孔不良を低減することができる。   In addition, after the porous support is bonded to the thermoplastic resin film, the surface of the porous support on which the thermoplastic resin film is not bonded is subjected to a hydrophobic treatment, so that the heat-sensitive stencil sheet overlaps. In other words, even if the release agent of the heat-sensitive stencil sheet and the porous support of the heat-sensitive stencil sheet are in contact with each other for a long period of time, the release agent is less likely to migrate to the porous support, Since the function as a release agent is not impaired, fusion to the thermal head is difficult to occur, and perforation defects can be reduced.

本発明の感熱孔版原紙の製造工程を示す概略模式図である。It is a schematic diagram which shows the manufacturing process of the heat-sensitive stencil paper of this invention.

以下に、本発明の感熱孔版原紙を図面を参照して説明する。
図1は本発明の感熱孔版原紙の製造工程を示す概略模式図である。まず、熱可塑性樹脂フィルム1上に接着剤層2が設けられる(a)。接着剤層2を設ける方法は用いる接着剤に適した公知の方法によればよく、例えばロールコータ、グラビアコータなどで塗工することができる。
The heat-sensitive stencil sheet of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic diagram showing the production process of the heat-sensitive stencil sheet of the present invention. First, the adhesive layer 2 is provided on the thermoplastic resin film 1 (a). The method for providing the adhesive layer 2 may be a known method suitable for the adhesive to be used. For example, the adhesive layer 2 can be applied by a roll coater, a gravure coater or the like.

一方、多孔性支持体3には親水化処理が施される(b)。多孔性支持体の親水化処理としては、コロナ放電、電子線照射および紫外線照射等の活性エネルギー線を照射することによって処理できるが、このうち処理速度や処理装置の扱いやすさといった観点からはコロナ放電が好ましい。なお、親水化処理は化学的な薬剤により行ってもよい。例えば、シリカ等の親水性物質の添加、オレイン酸アミド、ステアリン酸アミド、エルカ酸アミド等の高級脂肪酸アミドを用いる方法、脂肪酸低級アルコールエステルや脂肪酸多価アルコール等のエステル系、脂肪族アルコールや多価アルコール等のアルコール系、高級脂肪酸やオキシ脂肪酸等の脂肪酸系、あるいはアニオンタイプやカチオンタイプの界面活性剤系等を好ましく挙げることができる。   On the other hand, the porous support 3 is subjected to a hydrophilic treatment (b). As the hydrophilic treatment of the porous support, it can be performed by irradiating active energy rays such as corona discharge, electron beam irradiation and ultraviolet irradiation. Among these, from the viewpoint of processing speed and ease of handling of the processing apparatus, Discharge is preferred. The hydrophilization treatment may be performed with a chemical agent. For example, addition of a hydrophilic substance such as silica, a method using a higher fatty acid amide such as oleic acid amide, stearic acid amide or erucic acid amide, an ester type such as a fatty acid lower alcohol ester or a fatty acid polyhydric alcohol, an aliphatic alcohol or a polyhydric alcohol Preferable examples include alcohols such as monohydric alcohols, fatty acids such as higher fatty acids and oxyfatty acids, and anionic and cationic surfactants.

続いて、接着剤層2を介して熱可塑性樹脂フィルム1と親水化処理が施された多孔性支持体3が貼り合わせられる(c)。このとき、多孔性支持体3は親水化処理が施された面3aを接着剤層2に向けて貼り合わせられる。貼り合わせ方法は特に限定されるものではなく、例えばドライラミネータ、ウェットラミネータなどで貼り合わせることができる。   Subsequently, the thermoplastic resin film 1 and the porous support 3 subjected to the hydrophilization treatment are bonded to each other through the adhesive layer 2 (c). At this time, the porous support 3 is bonded to the adhesive layer 2 with the surface 3a subjected to the hydrophilization treatment. The bonding method is not particularly limited. For example, the bonding can be performed using a dry laminator, a wet laminator, or the like.

親水化処理が施された多孔性支持体3は濡れ性が向上しているため、接着剤層2と貼り合わせられたときに接着剤が多孔性支持体3に浸透する。これによって接着点である多孔性支持体3を構成する繊維の一つ一つに接着剤がまとわりつくような状態となり、熱可塑性樹脂フィルム2に塗工された接着剤が多孔性支持体3との接着点に集中して接着強度が向上する。従って、接着剤の塗工量が少なくても接着強度は多い場合と同等、またはそれ以上を確保することができるとともに、接着剤の塗工量が少なくてもよいので、接着剤の局在化が軽減され穿孔不良を抑制することが可能となる。   Since the porous support 3 subjected to the hydrophilization treatment has improved wettability, the adhesive penetrates into the porous support 3 when bonded to the adhesive layer 2. As a result, the adhesive is stuck to each of the fibers constituting the porous support 3 that is an adhesion point, and the adhesive applied to the thermoplastic resin film 2 is bonded to the porous support 3. The adhesive strength is improved by concentrating on the bonding point. Therefore, even if the adhesive coating amount is small, the adhesive strength can be equal to or higher than when the adhesive strength is large, and the adhesive coating amount may be small, so that the adhesive is localized. Is reduced, and perforation defects can be suppressed.

熱可塑性樹脂フィルム1と親水化処理が施された多孔性支持体3が貼り合わせられた後に、多孔性支持体3の熱可塑性樹脂フィルム1が貼り合わせられていない面3bを疎水化処理する(d)。疎水化処理としては、シリコーン系撥水剤またはフッ素系撥水剤による処理が好ましい。シリコーン系撥水剤としてはジメチルシリコーンオイル、メチルフェニルシリコーンオイル、メチルハイドロジェンシリコーンオイル、側鎖・末端に有機基を導入した変性シリコーンオイルを好ましく挙げることができる。フッ素系撥水剤としては、下記一般式で表されるようなパーフルオロアルキル基を有するアクリル樹脂やウレタンオリゴマーを好ましく挙げることができる。   After the thermoplastic resin film 1 and the porous support 3 subjected to the hydrophilization treatment are bonded together, the surface 3b of the porous support 3 on which the thermoplastic resin film 1 is not bonded is subjected to a hydrophobic treatment ( d). As the hydrophobizing treatment, treatment with a silicone water repellent or a fluorine water repellent is preferable. Preferred examples of the silicone-based water repellent include dimethyl silicone oil, methylphenyl silicone oil, methyl hydrogen silicone oil, and modified silicone oil having an organic group introduced at the side chain / terminal. Preferred examples of the fluorine-based water repellent include acrylic resins and urethane oligomers having a perfluoroalkyl group represented by the following general formula.

(上記一般式中R1は水素または低級アルキル基、RfはCm2m+1で表されるパーフルオロアルキル基を持ち、かつ水酸基および不飽和基から選ばれる少なくとも1種の基を含む基、mは2〜21の整数、nは10〜200の整数である) (In the above general formula, R 1 is hydrogen or a lower alkyl group, R f has a perfluoroalkyl group represented by C m F 2m + 1 , and contains at least one group selected from a hydroxyl group and an unsaturated group. Group, m is an integer of 2 to 21, and n is an integer of 10 to 200)

その後、熱可塑性樹脂フィルム1上に剥離剤層4を形成する(e)。剥離剤の形成方法は特に限定されず、たとえば、剥離剤を含む成分を任意の溶剤に分散または溶解させ、ロールコーター、グラビアコーター、リバースコーター、バーコーター等を用いて塗工してから、溶剤を蒸発させればよい。これによって本発明の感熱孔版原紙10を製造することができる。なお、ここでは、疎水化処理工程(d)の後に剥離剤層の形成工程(e)を行う場合について説明したが、剥離剤層の形成工程(e)の後に疎水化処理工程(d)を行ってもよい。   Thereafter, a release agent layer 4 is formed on the thermoplastic resin film 1 (e). The method of forming the release agent is not particularly limited. For example, the component containing the release agent is dispersed or dissolved in an arbitrary solvent, and applied using a roll coater, gravure coater, reverse coater, bar coater, etc. Can be evaporated. Thereby, the heat-sensitive stencil sheet 10 of the present invention can be manufactured. Here, the case where the release agent layer forming step (e) is performed after the hydrophobic treatment step (d) has been described. However, the hydrophobic treatment step (d) is performed after the release agent layer forming step (e). You may go.

感熱孔版原紙10を重ねると、剥離剤層4が多孔性支持体3の3b面と接することになる。多孔性支持体3の3b面側が未処理の場合、接触した剥離剤層4の剥離剤が徐々に多孔性支持体3へ移行してしまうが、本発明の感熱孔版原紙10は多孔性支持体3の3b面が疎水化処理されているので、接触した剥離剤層4の剥離剤が移行することがなく、従って、熱可塑性樹脂フィルム1がサーマルヘッドに付着することがなく、これを起因とする穿孔不良を抑制することができる。   When the heat-sensitive stencil sheet 10 is stacked, the release agent layer 4 comes into contact with the 3b surface of the porous support 3. When the 3b surface side of the porous support 3 is untreated, the release agent of the release agent layer 4 in contact with the porous support 3 gradually moves to the porous support 3, but the heat-sensitive stencil sheet 10 of the present invention is a porous support. Since the 3b surface of 3 is hydrophobized, the release agent of the release agent layer 4 in contact with the surface does not migrate, and therefore the thermoplastic resin film 1 does not adhere to the thermal head. It is possible to suppress poor perforation.

続いて、本発明の感熱孔版原紙を構成する多孔性支持体、接着剤、熱可塑性樹脂フィルムおよび剥離剤について説明する。多孔性支持体は、熱可塑性樹脂フィルムを支持し印刷時にインキを通過させる構造を持つものであればよく、例えば、木材パルプ、麻、みつまた、こうぞのような天然繊維、及びレーヨン、ビニロン、ナイロン、ポリエステル、ポリフェニレンサルファイト、アクリロニトリルなどのような化学繊維を、単独又は混合して湿式又は乾式でシート状にしたものが挙げられる。坪量及び厚さについては特に限定されるものではないが、インキ消費量、強度及び取扱性の点から、坪量は5〜20g/m2程度が適当である。 Subsequently, the porous support, the adhesive, the thermoplastic resin film and the release agent constituting the heat-sensitive stencil sheet of the present invention will be described. The porous support only needs to have a structure that supports a thermoplastic resin film and allows ink to pass through during printing. For example, natural fibers such as wood pulp, hemp, honey or ridge, and rayon, vinylon, Examples thereof include chemical fibers such as nylon, polyester, polyphenylene sulfite, and acrylonitrile, which are used alone or mixed to form a sheet by wet or dry method. The basis weight and thickness are not particularly limited, but the basis weight is suitably about 5 to 20 g / m 2 from the viewpoint of ink consumption, strength, and handleability.

接着剤としては、熱可塑性樹脂フィルムと多孔性支持体とが接着可能であればよく、酢酸ビニル系、アクリル系、塩化ビニル酢酸ビニル共重合体系、ポリエステル系、ウレタン系、ポリアミド系等のエマルジョンタイプのもの、または溶剤タイプ、無溶剤タイプ、ホットメルトタイプ、赤外線、可視光線、紫外線もしくは電子線等によって硬化するいわゆる広義の光硬化性タイプのものなどが挙げられる。これらの接着剤のうち、より好ましいものとしては、酢酸ビニル系、ポリエステル系、アクリル系等の樹脂を酢酸エチル、トルエン、キシレン、メタノール、アセトンなどの溶剤に溶解した溶剤型接着剤とエポキシ(メタ)アクリレートオリゴマーやウレタン(メタ)アクリレートオリゴマーを(メタ)アクリレートモノマーで希釈した光硬化性接着剤が挙げられる。これらの接着剤には、必要に応じて、帯電防止剤、滑剤、レベリング剤等の添加剤を添加してもよい。   As the adhesive, it is only necessary that the thermoplastic resin film and the porous support can be bonded, and emulsion types such as vinyl acetate, acrylic, vinyl chloride vinyl acetate copolymer, polyester, urethane, polyamide, etc. Or a solvent type, a solventless type, a hot melt type, a so-called photocurable type in a broad sense that is cured by infrared rays, visible light rays, ultraviolet rays, electron beams, or the like. Among these adhesives, more preferred are solvent-based adhesives and epoxy (metathesis) in which vinyl acetate, polyester, and acrylic resins are dissolved in solvents such as ethyl acetate, toluene, xylene, methanol, and acetone. ) A photocurable adhesive obtained by diluting an acrylate oligomer or a urethane (meth) acrylate oligomer with a (meth) acrylate monomer. Additives such as antistatic agents, lubricants, and leveling agents may be added to these adhesives as necessary.

接着剤の塗工量は、用いる接着剤の種類にもよるが、例えば酢酸ビニル系の場合には0.05〜1.5g/m2を塗工すればよい。酢酸ビニル系の接着剤の場合、通常の塗工量は本発明の1.5〜2倍程度は必要である。本発明の感熱孔版原紙によれば、多孔性支持体の親水化処理によって、接着剤の塗工量が少なくても接着強度が確保することが可能となる。 The amount of adhesive applied depends on the type of adhesive used, but for example, in the case of vinyl acetate, 0.05 to 1.5 g / m 2 may be applied. In the case of a vinyl acetate adhesive, the normal coating amount is required to be about 1.5 to 2 times that of the present invention. According to the heat-sensitive stencil sheet of the present invention, the adhesive strength can be ensured by the hydrophilic treatment of the porous support, even if the amount of adhesive applied is small.

熱可塑性樹脂フィルムとしては、ポリエステル系樹脂フィルムを好ましく使用することができる。具体的には、ポリエチレンテレフタレート、ポリエチレン−2,6−ナフタレート、ポリブチレンテレフタレート、エチレンテレフタレート/エチレンイソフタレート共重合体、ブチレンテレフタレート/エチレンテレフタレート共重合体、ブチレンテレフタレート/ヘキサメチレンテレフタレート共重合体、ヘキサメチレンテレフタレート/1,4−シクロヘキサンジメチレンテレフタレート共重合体、エチレンテレフタレート/エチレン−2,6−ナフタレート共重合体が挙げられる。これらのうちいずれか1種を単独で含むフィルムであってもよいし、複数種のブレンド体からなるフィルムであってもよい。
フィルムは、必要に応じて、たとえば公知の顔料、粘度調整剤、分散剤、染色剤、潤滑剤、架橋剤、可塑剤などの各種添加剤を、適宜含んでいてもよい。
As the thermoplastic resin film, a polyester resin film can be preferably used. Specifically, polyethylene terephthalate, polyethylene-2,6-naphthalate, polybutylene terephthalate, ethylene terephthalate / ethylene isophthalate copolymer, butylene terephthalate / ethylene terephthalate copolymer, butylene terephthalate / hexamethylene terephthalate copolymer, hexa Examples include methylene terephthalate / 1,4-cyclohexanedimethylene terephthalate copolymer and ethylene terephthalate / ethylene-2,6-naphthalate copolymer. The film which contains any one of these alone may be sufficient, and the film which consists of a multiple types of blend body may be sufficient.
The film may appropriately contain various additives such as known pigments, viscosity modifiers, dispersants, dyeing agents, lubricants, crosslinking agents, and plasticizers as necessary.

剥離剤としては、シリコーンオイル、シリコーン系樹脂、フッ素系樹脂、界面活性剤などの公知のものが使用できる。剥離剤は、水等の溶媒に分散させて塗布することが好ましく、その際、公知の各種添加剤(たとえば、剥離剤の分散性を向上させるための分散助剤、界面活性剤、防腐剤、消泡剤等)を、感熱孔版原紙の特性を妨げない範囲で配合してもよい。
以下、本発明の感熱孔版原紙を実施例を用いてさらに詳細に説明する。
As the release agent, known ones such as silicone oil, silicone resin, fluorine resin, and surfactant can be used. The release agent is preferably applied after being dispersed in a solvent such as water. At that time, various known additives (for example, dispersion aids, surfactants, preservatives for improving the dispersibility of the release agent, An antifoaming agent or the like) may be blended within a range that does not interfere with the characteristics of the heat-sensitive stencil sheet.
Hereinafter, the heat-sensitive stencil sheet of the present invention will be described in more detail using examples.

(実施例1)
繊度0.2dtexのポリエチレンテレフタレート繊維を用い湿式抄紙法により坪量10.3g/m2の多孔性支持体を得た。この多孔性支持体のフィルムと接着する面にコロナ放電処理を行った後、酢酸ビニル系接着剤0.8g/m2を塗工した厚さ1.7μmの二軸延伸ポリエステルフィルムと接着し、フィルム面にシリコーン系剥離剤0.1g/m2を塗布して感熱孔版原紙を作製した。
Example 1
A porous support having a basis weight of 10.3 g / m 2 was obtained by wet papermaking using polyethylene terephthalate fibers having a fineness of 0.2 dtex. After the corona discharge treatment was performed on the surface of the porous support to be bonded to the film, it was bonded to a 1.7 μm thick biaxially stretched polyester film coated with a vinyl acetate adhesive 0.8 g / m 2 . A silicone-based release agent 0.1 g / m 2 was applied to the film surface to prepare a heat-sensitive stencil sheet.

(実施例2)
多孔性支持体をマニラ麻50%、繊度0.2dtexのポリエチレンテレフタレート繊維50%、坪量10.5g/m2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。
(Example 2)
A heat-sensitive stencil sheet was prepared in the same manner as in Example 1 except that the porous support was 50% Manila hemp, 50% polyethylene terephthalate fiber having a fineness of 0.2 dtex, and a basis weight of 10.5 g / m 2 .

(実施例3)
多孔性支持体とフィルムを貼り合わせた後、多孔性支持体のフィルムが設けられた側とは反対側の面にシリコーン系撥水剤を塗布した以外は実施例1と同様にして感熱孔版原紙を作製した。
(Example 3)
After bonding the porous support and the film, the heat-sensitive stencil sheet was the same as in Example 1 except that a silicone-based water repellent was applied to the surface of the porous support opposite to the side on which the film was provided. Was made.

(実施例4)
多孔性支持体と貼り合わせた後、多孔性支持体のフィルムが設けられた側とは反対側の面にフッ素系撥水剤を塗布した以外は実施例1と同様にして感熱孔版原紙を作製した。
Example 4
After bonding with the porous support, a heat-sensitive stencil sheet was prepared in the same manner as in Example 1 except that a fluorine-based water repellent was applied to the surface of the porous support opposite to the side where the film was provided. did.

(比較例1)
コロナ放電処理を行わない以外は実施例1と同様にして感熱孔版原紙を作製した。
(Comparative Example 1)
A heat-sensitive stencil sheet was prepared in the same manner as in Example 1 except that the corona discharge treatment was not performed.

(比較例2)
コロナ放電処理をフィルムの接着剤塗工面に施した以外は実施例1と同様にして感熱孔版原紙を作製した。
(Comparative Example 2)
A heat-sensitive stencil sheet was prepared in the same manner as in Example 1 except that the corona discharge treatment was performed on the adhesive-coated surface of the film.

(評価)
(穿孔評価)
デジタル孔版印刷機「リソグラフRZ970」(理想科学工業製)を用い、3×3ドットにつき、1ドット穿孔するようなパターンを製版した。次に、印刷用紙としてグロスコート紙を用い印刷を行った。1000個の印刷ドットのうち、欠けている個数をカウントして穿孔不発率を求め、以下の基準で評価した。
穿孔不発率[%]=[(欠けた印刷ドットの数)/1000]×100
◎:0.5%未満
○:0.5%以上1.0%未満
△:1%以上
(Evaluation)
(Perforation evaluation)
Using a digital stencil printing machine "Lithograph RZ970" (manufactured by Riso Kagaku Kogyo Co., Ltd.), a pattern in which 1 dot was punched per 3 × 3 dots was made. Next, printing was performed using gloss coated paper as printing paper. Of 1000 printed dots, the number of missing dots was counted to determine the perforation failure rate, and evaluated according to the following criteria.
Perforation failure rate [%] = [(number of missing printed dots) / 1000] × 100
◎: Less than 0.5% ○: 0.5% or more and less than 1.0% △: 1% or more

(耐刷性)
デジタル孔版印刷機「リソグラフRZ970」(理想科学工業製)を用い、180枚/分で3000枚印刷した時のマスター切れ、フィルムの剥離を評価した。
◎:切れ、剥離ともになし
×:切れまたは剥離あり
(Print life)
Using a digital stencil printing machine "Lithograph RZ970" (manufactured by Riso Kagaku Kogyo Co., Ltd.), the master was cut and the film was peeled when 3000 sheets were printed at 180 sheets / min.
◎: No cutting or peeling ×: Cutting or peeling

(保存安定性)
マスターをロール状態で50℃環境に1か月放置した後、デジタル孔版印刷機「リソグラフRZ970」(理想科学工業製)を用いてベタを製版し、顕微鏡にて穿孔状態を目視で確認した。
◎:穿孔状態が良好
○:穿孔不良が僅かに発生
△:穿孔不良が一部発生
製造条件とともに評価結果を表1に示す。
(Storage stability)
After leaving the master in a roll state in a 50 ° C. environment for one month, a solid plate was made using a digital stencil printing machine “Lithograph RZ970” (manufactured by Riso Kagaku Kogyo), and the state of perforation was visually confirmed with a microscope.
◎: Perforated state is good. ○: Slightly perforated defect occurs. △: A part of perforated defect occurs. Table 1 shows the evaluation results together with the manufacturing conditions.

表1に示すように、実施例1〜4のマスターは多孔性支持体が親水化処理されているため、多孔性支持体と熱可塑性樹脂フィルムの接着効果が高まり、多孔性支持体と熱可塑性樹脂フィルムとの間で剥離が起こらなかった。また、多孔性支持体は濡れ性が向上しているため、接着剤層と貼り合わせられたときに接着剤が多孔性支持体に浸透し、これによって熱可塑性樹脂フィルム側に残る接着剤が減少するため穿孔不良を低減することができた。   As shown in Table 1, in the masters of Examples 1 to 4, since the porous support was hydrophilized, the adhesion effect between the porous support and the thermoplastic resin film was increased, and the porous support and the thermoplastic were increased. No peeling occurred between the resin film. In addition, since the porous support has improved wettability, the adhesive penetrates the porous support when bonded to the adhesive layer, thereby reducing the adhesive remaining on the thermoplastic resin film side. As a result, perforation defects could be reduced.

一方で、多孔性支持体が未処理の比較例1では多孔性支持体への接着剤の浸透が少ないために、熱可塑性樹脂フィルム側に残る接着剤が多く、穿孔不発が生じ、また、接着剤が多孔性支持体との接着点に集中しないので剥離が著しかった。また比較例2はフィルム側にコロナ処理を施したものであるが、この場合には接着強度は向上するものの、多孔性支持体の濡れ性に変化はないため接着剤の浸透がなく、結果として接着剤の多いところが局在したために穿孔不発が発生した。   On the other hand, in Comparative Example 1 in which the porous support was not treated, since there was little penetration of the adhesive into the porous support, a large amount of adhesive remained on the thermoplastic resin film side, causing no perforation, and adhesion. Peeling was significant because the agent did not concentrate at the point of adhesion with the porous support. Moreover, although the comparative example 2 is what gave the corona treatment to the film side, in this case, although adhesive strength improves, since there is no change in the wettability of a porous support body, there is no penetration | penetration of an adhesive agent, As a result Due to the localization of a lot of adhesive, no perforation occurred.

また、実施例3および4は多孔性支持体が熱可塑性樹脂フィルムに貼り合わせられた後に、多孔性支持体の熱可塑性樹脂フィルムが貼り合わせられていない面を疎水化処理したものであるが、この場合には、マスターの剥離剤と多孔性支持体とが接する状態で長期間放置しても、剥離剤が多孔性支持体へ移行しにくくなり、長期間経過しても剥離剤としての機能がそこなわれないため、サーマルヘッドへの融着がおこりにくく、穿孔不良を低減することができた。なお、実施例1および2が比較例よりも保存安定性が悪くなったのは、多孔性支持体を親水化処理する際に、多孔性支持体の親水化が裏面にまで達したためである。従って、感熱孔版原紙を重なった状態で長期間放置する場合には、多孔性支持体が熱可塑性樹脂フィルムに貼り合わせられた後に、多孔性支持体の熱可塑性樹脂フィルムが貼り合わせられていない面を疎水化処理することが好ましい。   In Examples 3 and 4, after the porous support was bonded to the thermoplastic resin film, the surface of the porous support on which the thermoplastic resin film was not bonded was hydrophobized. In this case, even if the master release agent and the porous support are in contact with each other for a long period of time, the release agent does not easily move to the porous support, and the function as a release agent even after a long period of time has passed. Therefore, it is difficult for the thermal head to be fused and the perforation defects can be reduced. The reason why the storage stability of Examples 1 and 2 was worse than that of the comparative example was that when the porous support was hydrophilized, the hydrophilic support reached the back surface. Accordingly, when the heat-sensitive stencil sheet is left for a long time in a state where it is overlapped, the surface of the porous support on which the thermoplastic resin film is not bonded after the porous support is bonded to the thermoplastic resin film. Is preferably hydrophobized.

以上のように、本発明の感熱孔版原紙によれば、少ない接着剤塗工量で十分な接着強度を確保できるとともに、穿孔不良を抑制することができる。
なお、本実施例では親水化処理としてコロナ放電処理を、疎水化処理としてシリコーン系撥水剤またはフッ素系撥水剤による処理を示したが、親水化処理による多孔性支持体の濡れ性、接着剤の浸透性の向上、疎水化処理による多孔性支持体の疎水性付与という作用からすれば、その他の親水化処理、疎水化処理でも同様の結果を得られるものと推測される。
As described above, according to the heat-sensitive stencil sheet of the present invention, sufficient adhesive strength can be secured with a small amount of adhesive coating, and perforation defects can be suppressed.
In this example, corona discharge treatment was used as the hydrophilization treatment, and treatment with a silicone water repellent or fluorine water repellent was used as the hydrophobization treatment. However, wettability and adhesion of the porous support by the hydrophilization treatment were shown. From the effects of improving the permeability of the agent and imparting hydrophobicity to the porous support by the hydrophobic treatment, it is presumed that similar results can be obtained by other hydrophilic treatments and hydrophobic treatments.

1 熱可塑性樹脂フィルム
2 接着剤層
3 多孔性支持体
4 剥離剤層
10 感熱孔版原紙(マスター)
DESCRIPTION OF SYMBOLS 1 Thermoplastic resin film 2 Adhesive layer 3 Porous support body 4 Release agent layer 10 Heat-sensitive stencil paper (master)

Claims (4)

多孔性支持体に接着剤を介して熱可塑性樹脂フィルムが貼り合わせられ、該熱可塑性樹脂フィルム上にさらに剥離剤層が設けられた感熱孔版原紙であって、前記多孔性支持体を、前記熱可塑性樹脂フィルムに貼り合わせられる前に親水化処理したものであることを特徴とする感熱孔版原紙。   A heat-sensitive stencil sheet in which a thermoplastic resin film is bonded to a porous support via an adhesive, and a release agent layer is further provided on the thermoplastic resin film, the porous support being the thermal support. A heat-sensitive stencil sheet characterized by being hydrophilized before being bonded to a plastic resin film. 前記多孔性支持体が前記熱可塑性樹脂フィルムに貼り合わせられた後に、前記多孔性支持体の前記熱可塑性樹脂フィルムが貼り合わせられていない面を疎水化処理したものであることを特徴とする請求項1記載の感熱孔版原紙。   The surface of the porous support on which the thermoplastic resin film is not bonded is hydrophobized after the porous support is bonded to the thermoplastic resin film. Item 2. The heat-sensitive stencil sheet according to item 1. 前記親水化処理がコロナ放電であることを特徴とする請求項1または2記載の感熱孔版原紙。   The heat-sensitive stencil sheet according to claim 1 or 2, wherein the hydrophilization treatment is corona discharge. 前記疎水化処理がシリコーン系撥水剤またはフッ素系撥水剤による処理であることを特徴とする請求項1、2または3記載の感熱孔版原紙。   The heat-sensitive stencil sheet according to claim 1, 2, or 3, wherein the hydrophobizing treatment is a treatment with a silicone water repellent or a fluorine water repellent.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104002532A (en) * 2014-06-09 2014-08-27 苏州斯迪克新材料科技股份有限公司 Transparent colored protective film and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104002532A (en) * 2014-06-09 2014-08-27 苏州斯迪克新材料科技股份有限公司 Transparent colored protective film and preparation method thereof

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