JP2005343069A - Stencil printing base paper - Google Patents

Stencil printing base paper Download PDF

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JP2005343069A
JP2005343069A JP2004167029A JP2004167029A JP2005343069A JP 2005343069 A JP2005343069 A JP 2005343069A JP 2004167029 A JP2004167029 A JP 2004167029A JP 2004167029 A JP2004167029 A JP 2004167029A JP 2005343069 A JP2005343069 A JP 2005343069A
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base paper
formation
tensile strength
recesses
minute recesses
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Japanese (ja)
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Takatomi Shiozaki
孝富 塩崎
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Duplo Seiko Corp
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Duplo Seiko Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a stencil printing base paper, which also can keep the elongation of an image and a plate wearability under the condition that the merits of the stencil printing base paper made of a thermoplastic resin film material having a large number of minute recesses on one side are kept unchanged. <P>SOLUTION: This stencil printing base paper 1 is manufactured only from the thermoplastic resin material having a large number of minute recesses formed on one side. The tensile strength at 1% elongation in a printing feeding direction of the base paper 1 after the formation of the minute recesses is set to be at least 30% of the tensile strength in the same direction of the base paper 1a before the formation of the minute recesses. In addition, the polyester film material to be used preferably has a thickness of 5-20 μm. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、一方の面に多数の微小凹部が形成され、サーマルヘッド等の加熱手段により微小凹部形成面とは反対側から加熱溶融されることにより製版される熱可塑性樹脂フィルム材のみからなる孔版印刷用原紙に関する。   The present invention is a stencil made of only a thermoplastic resin film material which is formed by forming a large number of minute recesses on one surface and being heated and melted from the side opposite to the surface where the minute recesses are formed by a heating means such as a thermal head. It relates to printing paper.

孔版印刷用原紙として、従来、熱可塑性樹脂フィルム材と、和紙や不織布等のインク透過性の支持体とを張り合わせてなる張り合わせ形の孔版印刷用原紙が使用されており、サーマルヘッドの加熱による所定箇所の開口（穿孔）を良好に行うために、熱可塑性樹脂製フィルム層を薄くし、一方、熱可塑性樹脂フィルム層を薄くすることによる剛性の低下を、上記支持体により補い、取扱性を保つようになっていた。   Conventionally, as a stencil printing paper, a laminated stencil printing paper is used which is formed by laminating a thermoplastic resin film material and an ink-permeable support such as Japanese paper or nonwoven fabric. In order to make the opening (perforation) well, the thermoplastic resin film layer is made thin, while the rigidity reduction caused by making the thermoplastic resin film layer thin is compensated by the above support to maintain handling It was like that.

しかしながら、上記張り合わせ構造の孔版印刷用原紙では次のような不具合があった。
（１）部品点数が増えると共に接着剤による接着工程が必要になり、部品コストが高くなる。 However, the stencil printing paper having the above laminated structure has the following problems.
(1) The number of parts increases and a bonding process using an adhesive is required, resulting in high part costs.

（２）接着剤が製版にもたらす「インク透過開口の変形」等により、印刷精度が低下する。   (2) The printing accuracy is lowered due to “deformation of ink transmission opening” or the like brought about by the adhesive in plate making.

（３）支持体の繊維がフィルムの開口内に入って印刷イメージに繊維目が出たり、支持体に無駄にインクが吸収される。   (3) The fiber of the support enters into the opening of the film, and the fiber image appears in the print image, or the ink is absorbed unnecessarily by the support.

（４）異種材の貼り合わせにより、カールが生じる。   (4) Curling occurs due to the bonding of different materials.

前記張り合わせ構造に対して、最近では、一方の面に多数の微小凹部が形成された熱可塑性樹脂フィルム材のみからなる孔版印刷用原紙が各種開発されている（特許文献１及び２等参照）。このような多数の微小凹部を有する孔版印刷用原紙では、前記張り合わせ構造のように支持体を張り合わせることなく、一定の厚みを持たせることにより、剛性を維持し、取扱性を向上させることができる。また、製版時には、微小凹部の薄肉底部を溶融開口することになるので、小出力（少ない熱エネルギー）のサーマルヘッドによっても十分な開口性能を維持することができ、部品コストを低減できると共に、前述のような支持体の存在による印刷面の汚れやコスト高等、前記張り合わせ構造の不具合を解消できる。
特開２００１−２１３０６５号公報 特開２０００−３５６５５８号公報 In recent years, various types of stencil printing paper made of only a thermoplastic resin film material having a large number of minute recesses formed on one surface have been developed for the laminated structure (see Patent Documents 1 and 2, etc.). In such a stencil base paper having a large number of minute recesses, it is possible to maintain rigidity and improve handling by providing a constant thickness without sticking the support as in the pasting structure. it can. In addition, since the thin bottom portion of the minute concave portion is melted and opened at the time of plate making, sufficient opening performance can be maintained even with a thermal head having a small output (less thermal energy), and the component cost can be reduced. The problems of the laminated structure, such as contamination of the printing surface and high cost due to the presence of the support, can be solved.
JP 2001-213065 A JP 2000-356558 A

しかし、一方の面に多数の微小凹部を有する熱可塑性樹脂フィルム材のみからなる孔版印刷用原紙では、微小凹部を形成していることにより、微小凹部形成前の原紙の状態に比べ、引張強度が低下し、条件によっては、印刷イメージの伸びあるいは耐刷性に問題が生じる。   However, stencil printing paper consisting only of a thermoplastic resin film material having a large number of minute recesses on one side has a tensile strength compared to the state of the base paper before the formation of the minute recesses due to the formation of the minute recesses. Depending on the conditions, there is a problem in the elongation or printing durability of the printed image.

（発明の目的）
本発明は、一方の面に多数の微小凹部を有する熱可塑性樹脂フィルム材からなる孔版印刷用原紙の前記利点を維持しつつ、イメージの伸びや耐刷性も維持できる孔版印刷用原紙を提供することを目的としている。 (Object of invention)
The present invention provides a stencil printing base paper that can maintain image elongation and printing durability while maintaining the above advantages of a stencil printing base paper made of a thermoplastic resin film material having a large number of minute recesses on one surface. The purpose is that.

前記課題を解決するため、本発明は、一方の面に多数の微小凹部が形成された熱可塑性樹脂フィルム材のみからなる孔版印刷用原紙において、微小凹部形成後の前記原紙の印刷送り方向の伸度１％の引張強度が、微小凹部形成前の前記原紙の同方向伸度の引張強度の３０％以上としている。好ましくは、厚さが５μｍ〜２０μｍのポリエステルフィルム材のみで孔版印刷用原紙を製作する。   In order to solve the above-described problems, the present invention provides a stencil sheet made of only a thermoplastic resin film material having a large number of minute recesses formed on one surface, and the stretching of the base paper after the formation of the minute recesses is increased. The tensile strength of 1% is 30% or more of the tensile strength in the same direction of elongation of the base paper before the formation of the minute recesses. Preferably, the base paper for stencil printing is manufactured only with a polyester film material having a thickness of 5 μm to 20 μm.

（１）微小凹部形成後の原紙の印刷送り方向の伸度１％の引張強度を、凹部の深度、凹部の薄肉底部の厚さあるいは凹部の密度等を調整することにより、微小凹部形成前の前記原紙の同方向同伸度の引張強度の３０％以上に確保しているので、印刷時に原紙が印刷送り方向に延びるのを抑制でき、それによりイメージの伸びを抑制し、品質の良いイメージを形成でき、また、原紙の耐刷性も向上する。   (1) By adjusting the tensile strength of the elongation of 1% in the printing feed direction of the base paper after the formation of the minute recesses, the depth of the recesses, the thickness of the thin bottom portion of the recesses or the density of the recesses, etc. Since the tensile strength in the same direction and the same elongation of the base paper is secured to 30% or more, it is possible to suppress the base paper from extending in the print feed direction during printing, thereby suppressing the elongation of the image and producing a good quality image. It can be formed, and the printing durability of the base paper is also improved.

（２）原紙の厚さを５μｍ〜２０μｍとすることにより、取扱性を維持できると共に、印刷時の原紙の破れやしわの発生も抑制することができ、また、カールの発生も効果的に抑制できる。   (2) By setting the thickness of the base paper to 5 μm to 20 μm, it is possible to maintain the handleability, to suppress the tearing and wrinkling of the base paper during printing, and to effectively suppress the curling. it can.

（３）一方の面に多数の微小凹部が形成された熱可塑性樹脂フィルム材のみから孔版印刷用原紙を構成していることにより、張り合わせ構造の孔版印刷用原紙と比較して、部品点数の削減、接着剤の使用による「インク透過開口の変形」等の不都合を解消できると共に、支持体の使用によるインクの無駄及び印刷のかすれ等の不都合も解消でき、さらに、サーマルヘッドの小出力化も達成できる。   (3) Since the stencil sheet is composed only of a thermoplastic resin film material having a large number of minute recesses on one side, the number of parts can be reduced compared to a stencil sheet with a laminated structure. In addition to eliminating problems such as “deformation of ink permeable openings” due to the use of adhesives, it is also possible to eliminate problems such as waste of ink and blurring of printing due to the use of a support, and a reduction in the output of the thermal head. it can.

［孔版印刷用原紙の構成］
図１は、本発明が適用される孔版印刷用原紙（以下、単に「原紙」と称する）１の平面図であり、印刷時には図１のような長方形に切断した状態で使用するが、原紙製造時は長尺紙としてロール状に巻かれており、製版後、印刷用のドラムに巻き付ける際に長方形に切断される。印刷時には、画像形成ドラムと押圧ローラの間に、矢印Ｆ方向（縦方向）に送り込まれる。 [Configuration of base paper for stencil printing]
FIG. 1 is a plan view of a stencil sheet (hereinafter simply referred to as “base sheet”) 1 to which the present invention is applied, and is used in a state of being cut into a rectangle as shown in FIG. The paper is rolled into a roll as long paper, and is cut into a rectangular shape when it is wound around a printing drum after plate making. During printing, the sheet is fed in the direction of arrow F (vertical direction) between the image forming drum and the pressing roller.

原紙１の一方の面には多数の微小凹部２が形成されており、該多数の微小凹部２は、たとえば最大画像形成範囲（全画像形成範囲）Ｓ1内に、均一な密度で分布している。勿論、原紙１の全面に微小凹部２を形成した構造とすることも可能である。   A large number of minute recesses 2 are formed on one surface of the base paper 1, and the many minute recesses 2 are distributed at a uniform density, for example, in the maximum image formation range (total image formation range) S1. . Of course, a structure in which the minute recesses 2 are formed on the entire surface of the base paper 1 is also possible.

原紙１は熱可塑性樹脂フィルム材のみから構成されており、熱可塑性樹脂フィルム材としては、厚さが１．５μｍ以上２０μｍ以下のポリエステルフィルム材が好ましい。これは、取扱い可能な限界厚さを考えると１．５μｍ程度が下限であるが、あまりに薄いと簡単に折り目がついたり破れたりする。したがって、取扱い易さを考慮に入れると、５μｍ程度以上が好ましい。逆に原紙厚さが２０μｍを超えると、従来の支持体張り合わせ構造の厚さとの差が小さくなり、原紙自体を薄型化できるメリットが小さくなってしまい、また材料の無駄である。したがって、本実施の形態では、厚さ５μｍ〜２０μｍのポリエステルフィルム材を使用している。   The base paper 1 is composed of only a thermoplastic resin film material, and a polyester film material having a thickness of 1.5 μm or more and 20 μm or less is preferable as the thermoplastic resin film material. Considering the limit thickness that can be handled, the lower limit is about 1.5 μm, but if it is too thin, it can be easily creased or broken. Therefore, if the ease of handling is taken into consideration, about 5 μm or more is preferable. On the other hand, if the thickness of the base paper exceeds 20 μm, the difference from the thickness of the conventional support laminated structure becomes small, and the merit of thinning the base paper itself becomes small, and the material is wasted. Therefore, in the present embodiment, a polyester film material having a thickness of 5 μm to 20 μm is used.

なお、ポリエステルフィルム材以外の原紙の材料としては、ポリエチレンテレフタレート樹脂フィルム材、ポリエチレン樹脂フィルム材、ポリ塩化ビニル樹脂フィルム材、ポリ塩化ビニリデン樹脂フィルム材、ポリメチルペンテン樹脂フィルム材、ポリプロピレン樹脂フィルム材、ポリエチレンナフタレート樹脂フィルム材、ポリビニルアルコール樹脂フィルム材、ナイロン６フィルム材、ポリブチレンテレフタレート等が挙げられる。   In addition, as a material of the base paper other than the polyester film material, a polyethylene terephthalate resin film material, a polyethylene resin film material, a polyvinyl chloride resin film material, a polyvinylidene chloride resin film material, a polymethylpentene resin film material, a polypropylene resin film material, Examples thereof include a polyethylene naphthalate resin film material, a polyvinyl alcohol resin film material, a nylon 6 film material, and polybutylene terephthalate.

図２は微小凹部形成後の原紙１を一部切り取って示すの縦断面拡大斜視図であり、各微小凹部２の底には薄肉底部３が存在している。微小凹部２の配列はランダムな配列でも良いが、本実施の形態では、千鳥状に規則的に配列しており、また、微小凹部２の分布密度（配列ピッチ）は、図６に示す製版装置のサーマルヘッド３１の１つのヒータ部（ドット）３０内に、少なくとも２つの微小凹部２が存在するように設定されている。   FIG. 2 is an enlarged perspective view of a longitudinal section of the base paper 1 after the formation of the minute recesses, and a thin bottom 3 is present at the bottom of each minute recess 2. The arrangement of the minute recesses 2 may be random, but in the present embodiment, the minute recesses 2 are regularly arranged in a zigzag pattern, and the distribution density (arrangement pitch) of the minute recesses 2 is shown in FIG. It is set so that at least two minute recesses 2 exist in one heater portion (dot) 30 of the thermal head 31.

[微小凹部の形成方法]
図３は、微小凹部形成前の原紙１ａに微小凹部２を形成する方法を示している。なお、微小凹部形成後の原紙１と区別するために微小凹部形成前の原紙の符号は前記のように「１ａ」と表記している。多数の微小突起１２を有する型押しローラ１０と支承ローラ１１との間に、微小凹部形成前の原紙１ａを矢印Ｆ方向に送り込み、該微小凹部形成前の原紙１ａの一方の面に、前記微小突起１２によって多数の微小凹部１２を均一な密度で形成し、原紙１を完成する。なお、型押しローラ１０に内蔵される加熱手段により微小凹部形成前の原紙１ａを加熱しつつ、上記のように微小凹部２を形成する場合もある。 [Method of forming minute recesses]
FIG. 3 shows a method of forming the minute recesses 2 in the base paper 1a before the minute recesses are formed. In addition, in order to distinguish from the base paper 1 after the formation of the minute recesses, the reference numeral of the base paper before the formation of the minute recesses is expressed as “1a” as described above. Between the embossing roller 10 having a large number of micro-projections 12 and the support roller 11, the base paper 1a before the formation of the micro-recesses is fed in the direction of arrow F, and the micro paper is formed on one surface of the base paper 1a before the formation of the micro-recesses. A large number of minute recesses 12 are formed with a uniform density by the protrusions 12 to complete the base paper 1. In some cases, the minute recesses 2 are formed as described above while heating the base paper 1a before the formation of the minute recesses by the heating means built in the embossing roller 10.

[製版装置及び製版方法]
図４は、微小凹部形成後の原紙１を製版する装置及び方法を示しており、製版装置は、ゴム製のプラテンローラ３３と前記サーマルヘッド３１とを対向配置してなり、サーマルヘッド３１は、薄膜タイプの全面グレーズ型サーマルヘッドであり、ヒータ部３０と非ヒータ部３０ａは共に薄膜で形成されると共に平面状のグレーズ層３２の上に形成されており、個々のヒータ部３０は非ヒータ部３２に対して窪んでいる。製版する場合には、プラテンローラ３３とサーマルヘッド３１間に、微小凹部形成面がプラテンローラ３３側に向くように原紙１を挟持し、プラテンローラ３３の回転により原紙１を所定の送りピッチで送り込みながら、サーマルヘッド３１のヒータ部３０により原紙１の凹部形成面と反対側を順次加熱し、所定箇所の微小凹部２の薄肉底部３を溶融開口する。図５は微小凹部２が製版により開口した状態を示しており、開口部８の直径は概ね微小凹部２の前記直径ｃに相当する。なお、符号ｅは薄肉底部３の厚さを示している。 [Plate making apparatus and plate making method]
FIG. 4 shows an apparatus and a method for making the base paper 1 after the formation of the minute recesses. The plate making apparatus includes a rubber platen roller 33 and the thermal head 31 arranged to face each other. This is a thin-film-type full-scale glaze thermal head. The heater unit 30 and the non-heater unit 30a are both formed of a thin film and formed on a planar glaze layer 32. Each heater unit 30 is a non-heater unit. 32 is recessed. When making a plate, the base paper 1 is sandwiched between the platen roller 33 and the thermal head 31 so that the surface of the minute concave portion faces the platen roller 33, and the base paper 1 is fed at a predetermined feed pitch by the rotation of the platen roller 33. However, the heater 30 of the thermal head 31 sequentially heats the side opposite to the recess forming surface of the base paper 1 to melt and open the thin bottom 3 of the minute recess 2 at a predetermined location. FIG. 5 shows a state in which the minute recess 2 is opened by plate making, and the diameter of the opening 8 substantially corresponds to the diameter c of the minute recess 2. Note that the symbol e indicates the thickness of the thin bottom portion 3.

[引張強度の設定］
図１において、微小凹部形成後の原紙１の縦方向（矢印Ｆ方向）の引張強度は、縦方向の伸度１％において、微小凹部形成前の原紙１ａの同方向同伸度の引張強度の３０％以上となっている。該実施の形態では、微小凹部形成後の原紙１の縦方向（矢印Ｆ方向）の具体的な引張強度は、少なくとも１．８５Ｎ/cm以上となっている。 [Setting of tensile strength]
In FIG. 1, the tensile strength in the longitudinal direction (arrow F direction) of the base paper 1 after the formation of the minute recesses is equal to the tensile strength in the same direction and the same elongation of the base paper 1a before the formation of the minute recesses. 30% or more. In this embodiment, the specific tensile strength in the longitudinal direction (arrow F direction) of the base paper 1 after the formation of the minute recesses is at least 1.85 N / cm or more.

［各種引張強度比による印刷イメージの伸び及び耐刷性の試験例］
（試験の概要）
図１１の表に示すように、原紙厚さ、凹部ピッチ、凹部薄肉部厚さ、凹部直径及び微小凹部形成時の加圧条件を各種設定することにより、微小凹部形成前後での縦方向の伸度１％における引張強度比（％）が異なる４種類の原紙１を、実施例１〜３及び比較例１として製作し、それらの原紙１を製版し、印刷に使用することにより、図１０のように印刷性及び耐刷性を比較した。
（微小凹部形成前後の原紙の条件） [Examples of printing image elongation and printing durability with various tensile strength ratios]
(Summary of study)
As shown in the table of FIG. 11, by setting various conditions for the thickness of the base paper, the pitch of the recesses, the thickness of the recesses, the diameter of the recesses, and the recesses, the longitudinal stretch before and after the formation of the microrecesses is set. By producing four types of base papers 1 having different tensile strength ratios (%) at a degree of 1% as Examples 1 to 3 and Comparative Example 1, making these base papers 1 and using them for printing, FIG. Thus, printability and printing durability were compared.
(Conditions for the base paper before and after the formation of micro-recesses)

図１１の表は、実施例１〜３及び比較例１の原紙１（１ａ）の構造的条件を示しており、実施例１〜３では、凹部直径を２０μｍに統一し、凹部ピッチを６０μｍに統一しているが、原紙厚さと微小凹部薄肉底部３の厚さをそれぞれ異なる値とした。すなわち、実施例１は、原紙厚さを６μｍとし、凹部薄肉底部３の厚さを２．０μｍとし、実施例２は、原紙厚さを実施例１よりも厚くて８．０μｍとし、凹部薄肉底部３の厚さも実施例１よりも厚くて４．０μｍとしている。実施例３は、原紙厚さを実施例２よりもさらに厚くして１２μｍとし、凹部薄肉底部３の厚さも実施例２よりもさらに厚くして９．５μｍとしている。各実施例１〜３に対して比較例１は、凹部ピッチは前記実施例１〜３と同じ６０μｍとしているが、凹部直径を前記実施例１〜３よりも大きく２５μｍとしており、原紙厚さは実施例２と同じ８μｍとし、凹部薄肉底部は３μｍとしている。また、凹部形成時の加圧条件は、いずれの例においても４９０００Ｎである。   The table of FIG. 11 shows the structural conditions of the base paper 1 (1a) of Examples 1 to 3 and Comparative Example 1. In Examples 1 to 3, the concave diameter is unified to 20 μm, and the concave pitch is set to 60 μm. Although they are unified, the thickness of the base paper and the thickness of the thin concave bottom portion 3 are set to different values. That is, in Example 1, the thickness of the base paper is 6 μm, and the thickness of the concave bottom portion 3 is 2.0 μm. In Example 2, the base paper is thicker than Example 1 and is 8.0 μm, and the thickness of the concave portion is thin. The thickness of the bottom 3 is also thicker than that of Example 1 and is 4.0 μm. In Example 3, the thickness of the base paper is set to 12 μm, which is further thicker than that of Example 2, and the thickness of the concave bottom portion 3 is also set to be 9.5 μm, which is further thicker than that of Example 2. In Comparative Example 1 with respect to each of Examples 1 to 3, the recess pitch is 60 μm, which is the same as in Examples 1 to 3, but the recess diameter is larger than that of Examples 1 to 25 μm, and the base paper thickness is The same thickness as in Example 2 is set to 8 μm, and the bottom portion of the concave portion is set to 3 μm. Moreover, the pressurizing condition at the time of forming the recess is 49000 N in any example.

（引張強度の測定方法）
（１）図１１の各構造を有する４種類の微小凹部形成後の原紙１及び微小凹部形成前の原紙１ａをそれぞれ製造し、図１に破線で示すように、各微小凹部形成後の原紙１から幅Ｗ＝２cm、長さＬ＝１５cmの細長いサンプル１-sを切り出し、採取する。なお、該サンプル１-sの引張試験は、実質１０cmmの長さの部分を対象としており、長さ方向両端に２．５cmmずつのつかみ代を確保するために、前記のように長さ１５cmmに切り出すものである。該サンプル１-sは長さＬ方向が原紙１の縦方向（矢印Ｆ方向）に一致するように採取する。図示しないが、微小凹部形成前の原紙１ａからも微小凹部形成後の原紙１と同様に幅Ｗ＝２cm、長さＬ＝１５cmの細長いサンプル１ａ-s（図８）を切り出し、採取する。サンプル数としては、微小凹部形成前及び微小凹部形成後の各原紙１，１ａは共に、各実施例及び比較例毎に１０枚ずつ採取した。 (Measurement method of tensile strength)
(1) Four types of base paper 1 after the formation of the fine recesses and base paper 1a before the formation of the micro recesses having the respective structures of FIG. 11 are manufactured, and the base paper 1 after the formation of each micro recess as shown by a broken line in FIG. A long and narrow sample 1-s having a width W = 2 cm and a length L = 15 cm is cut out and collected. Note that the tensile test of the sample 1-s is intended for a portion having a length of substantially 10 cmm, and in order to secure a grip margin of 2.5 cmm at both ends in the length direction, the length is set to 15 cmm as described above. Cut out. The sample 1-s is collected so that the length L direction coincides with the longitudinal direction (arrow F direction) of the base paper 1. Although not shown, an elongated sample 1a-s (FIG. 8) having a width W = 2 cm and a length L = 15 cm is cut out from the base paper 1a before the formation of the minute recesses in the same manner as the base paper 1 after the formation of the microrecesses. As the number of samples, 10 sheets of each of the base papers 1 and 1a before and after forming the minute recesses were collected for each example and comparative example.

（２）そして、図７及び図８のように、各原紙サンプル１-s、1a-ｓの縦方向の引張試験を行った。図７は微小凹部形成後の原紙サンプル１-sの引張試験の状態、図８は微小凹部形成前の原紙サンプル１ａ-sの引張試験の状態を示しており、いずれも、縦方向に間隔Ｄを隔てて箇所を、引張試験機の１対の把持部により把持し、試験速度２０cm/分で、原紙サンプル１-s，１ａ-sが破断するまで白抜きの矢印で示すように引っ張り、図９のような荷重−伸び線図を各サンプル毎に記録計に記録した。   (2) Then, as shown in FIG. 7 and FIG. 8, a tensile test in the longitudinal direction of each base paper sample 1-s, 1a-s was performed. FIG. 7 shows a tensile test state of the base paper sample 1-s after the formation of the minute recesses, and FIG. 8 shows a tensile test state of the base paper sample 1a-s before the formation of the minute recesses. The part is separated by a pair of gripping parts of a tensile tester, pulled at a test speed of 20 cm / min as shown by the white arrows until the base paper samples 1-s and 1a-s break, A load-elongation diagram such as 9 was recorded on a recorder for each sample.

（３）図９は、一例として実施例３の荷重−伸び線図を示しており、実線で示す曲線Ｘ１は微小凹部形成後の原紙サンプル１-sの引張強度の変化、破線で示す曲線Ｘ２は微小凹部形成前の原紙１ａの引張強度の変化を示している。このように記録された線図において、縦方向の伸度１％（サンプル伸び量では１mm)における各曲線Ｘ１，Ｘ２の値を読み取り、微小凹部形成前の引張強度に対する微小凹部形成後の引張強度の比を、パーセント（％）で算出した。たとえば、実施例３では、微小凹部形成前の引張強度は５．５０Ｎ/cm、微小凹部形成後の引張強度は４．３５Ｎ/cmとなっており、微小凹部形成前に対する微小凹部形成後の引張強度比は、（４．３５/５．５０）×１００＝７９．０％となった。実施例３の場合と同様に、実施例１、実施例２及び比較例１においてもそれぞれ微小凹部形成前後における引張強度比（％）を求めた。なお、各例毎にサンプル数は１０枚ずつであるので、１０枚の試験結果を平均し、その平均値を図１０の左側の３つの項目にそれぞれ示した。   (3) FIG. 9 shows a load-elongation diagram of Example 3 as an example. A curve X1 indicated by a solid line is a change in tensile strength of the base paper sample 1-s after formation of a minute recess, and a curve X2 indicated by a broken line. Indicates changes in the tensile strength of the base paper 1a before the formation of the minute recesses. In the graph thus recorded, the values of the curves X1 and X2 at a longitudinal elongation of 1% (sample elongation of 1 mm) are read, and the tensile strength after forming the micro-recesses with respect to the tensile strength before forming the micro-recesses. The ratio was calculated as a percentage (%). For example, in Example 3, the tensile strength before forming the minute recesses is 5.50 N / cm, and the tensile strength after forming the minute recesses is 4.35 N / cm. The intensity ratio was (4.35 / 5.50) × 100 = 79.0%. As in the case of Example 3, in Example 1, Example 2 and Comparative Example 1, the tensile strength ratio (%) before and after the formation of the minute recesses was determined. Since the number of samples is 10 for each example, the test results of 10 sheets are averaged, and the average values are shown in the three items on the left side of FIG.

（印刷イメージの伸び及び耐刷性の試験）
前述のように製作した実施例１〜３及び比較例１の微小凹部形成後の原紙１を、図４に示すようなサーマルヘッド式製版方式（熱量２５ｍＪ/ｍｍ2)によりそれぞれ製版し、その製版原稿を用いて印刷した印刷物のイメージの伸びを確認し、その結果を図１０の右側の２つの欄に示した。すなわち、５００枚印刷時点で、伸びが０．５％未満のものを○印で表示し、０．５以上１．０％未満のものを△印で表示し、１．０％以上のものを×印で表示した。また、耐刷性として、２０００枚印刷時点での原紙１の破れを目視で確認し、破れが無い場合を○印で表示し、破れが有る場合を×で表示した。 (Test of print image elongation and printing durability)
The base paper 1 after the formation of the minute recesses of Examples 1 to 3 and Comparative Example 1 manufactured as described above was made by a thermal head type plate making method (heat amount 25 mJ / mm 2 ) as shown in FIG. The elongation of the image of the printed matter printed using the original was confirmed, and the results are shown in the two columns on the right side of FIG. That is, when 500 sheets are printed, those with an elongation of less than 0.5% are indicated by a circle, those with an elongation of 0.5 to less than 1.0% are indicated by a triangle, Displayed with a cross. Further, as printing durability, tearing of the base paper 1 at the time of printing 2000 sheets was visually confirmed, a case where there was no tear was indicated by a circle, and a case where there was a tear was indicated by x.

（印刷イメージの伸び及び耐刷性の結果及び考察）
図１０において、比較例１は、微小凹部形成前の原紙１の引張強度が３．００Ｎ/ｃｍ、微小凹部形成後の原紙１ａの引張強度が０．６１Ｎ/ｃｍ、微小凹部形成前後の引張比強度比が２０．３％であり、この原紙１を製版し、印刷した場合、５００枚印刷時点では印刷イメージに１．０％以上の伸びが生じ、２０００枚印刷時点では破れが目視で確認できた。すなわち、印刷イメージの伸び並びに耐刷性は、共に×印の評価であった。 (Results and consideration of print image elongation and printing durability)
In FIG. 10, the comparative example 1 shows that the tensile strength of the base paper 1 before the formation of the micro-recesses is 3.00 N / cm, the tensile strength of the base paper 1a after the formation of the micro-recesses is 0.61 N / cm, and the tensile ratio before and after the formation of the micro-recesses. The strength ratio is 20.3%. When this base paper 1 is made and printed, the printed image has an elongation of 1.0% or more at the time of printing 500 sheets, and the tear can be visually confirmed at the time of printing 2000 sheets. It was. That is, both the elongation of the printed image and the printing durability were evaluated as x.

実施例１は、微小凹部形成前の原紙１の引張強度が１．８５Ｎ/ｃｍ、微小凹部形成後の原紙１ａの引張強度が１．１５Ｎ/ｃｍ、微小凹部形成後の引張強度比が６２．２％であり、この原紙１を製版し、印刷した場合、５００枚印刷時点では印刷イメージに０．５以上１．０％未満の範囲で伸びが生じたが、許容できる評価△印の範囲であり、一方、２０００枚印刷時点では、原紙１に破れは目視で確認できなかった。すなわち○印の評価であった。   In Example 1, the tensile strength of the base paper 1 before the formation of the minute recesses is 1.85 N / cm, the tensile strength of the base paper 1a after the formation of the minute recesses is 1.15 N / cm, and the tensile strength ratio after the formation of the minute recesses is 62. When the base paper 1 was made and printed, the elongation occurred in the printed image in the range of 0.5 to less than 1.0% at the time of printing 500 sheets. On the other hand, tearing of the base paper 1 could not be confirmed visually at the time of printing 2000 sheets. That is, the evaluation was a circle mark.

実施例２は、実施例１と比較して、原紙厚さ及び薄肉底部の厚さを厚くした構造であり、微小凹形成前の原紙１の引張強度が３．００Ｎ/ｃｍ、微小凹部形成後の原紙１ａの引張強度が２．００Ｎ/ｃｍ、微小凹部形成後の引張強度比が６６．７％であり、この原紙１を製版し、印刷した場合、５００枚印刷時点では印刷イメージの縦方向の伸びは０．５未満の○印の評価であり、また、２０００枚印刷時点では、原紙１の破れは目視で確認できず、○印の評価であった。   Example 2 has a structure in which the thickness of the base paper and the thickness of the thin-walled bottom are increased compared to Example 1, and the tensile strength of the base paper 1 before the formation of the micro-recesses is 3.00 N / cm, and after the formation of the micro-recesses The base paper 1a has a tensile strength of 2.00 N / cm and a tensile strength ratio after formation of minute recesses of 66.7%. When this base paper 1 is made and printed, the longitudinal direction of the printed image at the time of printing 500 sheets The elongation of ◯ was evaluated with a mark of less than 0.5, and at the time of printing 2000 sheets, tearing of the base paper 1 could not be visually confirmed, and was evaluated with a mark of ◯.

実施例３は、実施例２と比較して、さらに原紙厚さ及び薄肉底部の厚さを厚くした構造であり、微小凹形成前の原紙１の引張強度が５．５０Ｎ/ｃｍ、微小凹部形成後の原紙１ａの引張強度が４．３５Ｎ/ｃｍ、微小凹部形成後の引張強度比が７９．１％であり、この原紙１を製版し、印刷した場合、５００枚印刷時点では印刷イメージの縦方向の伸びは０．５未満の○印の評価であり、また、２０００枚印刷時点では、原紙１の破れは目視で確認できず、○印の評価であった。   Example 3 has a structure in which the thickness of the base paper and the thickness of the thin bottom portion are further increased as compared with Example 2, and the tensile strength of the base paper 1 before the formation of the micro-recesses is 5.50 N / cm, and the formation of the micro-recesses The subsequent base paper 1a has a tensile strength of 4.35 N / cm and a tensile strength ratio after the formation of minute recesses of 79.1%. When this base paper 1 is made and printed, the vertical direction of the printed image is printed at the time of printing 500 sheets. The elongation in the direction was evaluated with a circle mark of less than 0.5, and at the time of printing 2000 sheets, the tear of the base paper 1 could not be visually confirmed, and was evaluated with a circle mark.

図１０及び図１１の表から判断できるように、原紙厚さが６〜１２μｍ程度の範囲において、引張強度比（％）が比較例１の２０．３％よりも大きくて３０％程度以上になれば、印刷性（印刷イメージの伸び）及び耐刷性が、共に許容できる範囲（○印又は△印）になると共に、上記引張強度比が高くなるに従い、印刷性及び耐刷性が高くなる。好ましくは、実施例２のように引張強度比を６６．７％程度以上にしていると、印刷性及び耐刷性のいずれもが満足にゆく評価（○印）が得られる。   As can be judged from the tables of FIGS. 10 and 11, the tensile strength ratio (%) can be larger than 20.3% of Comparative Example 1 and about 30% or more in the range where the base paper thickness is about 6 to 12 μm. For example, both the printability (elongation of the print image) and the printing durability are in an allowable range (◯ mark or Δ mark), and the printing strength and printing durability increase as the tensile strength ratio increases. Preferably, when the tensile strength ratio is about 66.7% or more as in Example 2, a satisfactory evaluation (◯ mark) is obtained for both printability and printing durability.

［その他の実施の形態］
（１）本発明では、微小凹部形成前後の原紙の引張強度比により、印刷性及び耐刷性を判定しているが、このような判定方法に加え、微小凹部形成後の原紙１について、製版前の引張強度と、黒べた印刷後の縦方向の引張強度比も加味することもできる。好ましくは、製版前の原紙の縦方向の伸び１％における引張強度に対する黒べた製版後の原紙の同方向同伸度における引張強度の比（％）が、８０％以上となるようにする。 [Other embodiments]
(1) In the present invention, printability and printing durability are determined based on the tensile strength ratio of the base paper before and after the formation of the micro-recesses. In addition to such a determination method, the plate making of the base paper 1 after the formation of the micro-recesses is made. It is also possible to take into account the previous tensile strength and the tensile strength ratio in the longitudinal direction after black solid printing. Preferably, the ratio (%) of the tensile strength in the same direction and elongation of the base paper after black plate making to the tensile strength at 1% in the longitudinal direction elongation of the base paper before plate making is 80% or more.

本発明が適用される孔版印刷用原紙の平面図である。It is a top view of the base paper for stencil printing to which this invention is applied. 図１の孔版印刷用原紙を一部切り取って示す拡大斜視図である。FIG. 2 is an enlarged perspective view showing a part of the stencil sheet of FIG. 本発明に係る孔版印刷用原紙の微小凹部形成方法を示す縦断面図である。It is a longitudinal cross-sectional view which shows the micro recessed part formation method of the base paper for stencil printing which concerns on this invention. 本発明に係る孔版印刷用原紙の製版方法を示す縦断面図である。It is a longitudinal cross-sectional view which shows the plate-making method of the base paper for stencil printing based on this invention. 本発明に係る孔版印刷用原紙の製版後の状態を示す拡大縦断面図である。FIG. 3 is an enlarged longitudinal sectional view showing a state after stencil making of a stencil printing base paper according to the present invention. 製版に使用するサーマルヘッドのヒータ部の拡大平面図である。It is an enlarged plan view of the heater part of the thermal head used for plate making. 微小凹部形成後の原紙サンプルの引張試験時の状態を示す斜視図である。It is a perspective view which shows the state at the time of the tension test of the base paper sample after micro recessed part formation. 微小凹部形成前の原紙サンプルの引張試験時の状態を示す斜視図である。It is a perspective view which shows the state at the time of the tension test of the base paper sample before micro recessed part formation. 本発明の実施例３における微小凹部形成前後の原紙の伸度−引張強度の変化を示す図である。It is a figure which shows the change of the elongation-tensile strength of the base paper before and behind micro recessed part formation in Example 3 of this invention. 本発明の実施例１〜３及び比較例１の印刷性及び耐刷性を比較したテスト結果表（図表）である。It is a test result table | surface (table | table) which compared the printability and printing durability of Examples 1-3 and Comparative Example 1 of this invention. 本発明の実施例１〜３及び比較例１の構造的な条件を比較した図表である。It is the table | surface which compared the structural conditions of Examples 1-3 and Comparative Example 1 of this invention.

符号の説明Explanation of symbols

１ 微小凹部形成後の孔版印刷用原紙
１ａ 微小凹部形成前の孔版印刷用原紙
２ 微小凹部
３ 薄肉底部
DESCRIPTION OF SYMBOLS 1 Base paper for stencil printing after minute recessed part formation 1a Base paper for stencil printing before minute recessed part 2 Minute recessed part 3 Thin bottom part

Claims (2)

一方の面に多数の微小凹部が形成された熱可塑性樹脂フィルム材のみからなる孔版印刷用原紙において、
微小凹部形成後の前記原紙の印刷送り方向の伸度１％の引張強度が、微小凹部形成前の前記原紙の同方向同伸度の引張強度の３０％以上であることを特徴とする孔版印刷用原紙。 In a stencil printing base paper consisting only of a thermoplastic resin film material having a large number of minute recesses formed on one side,
Stencil printing having a tensile strength of 1% elongation in the printing feed direction of the base paper after the formation of the fine recesses is 30% or more of the tensile strength of the base paper in the same direction before the formation of the fine recesses. Base paper. 厚さが５μｍ〜２０μｍのポリエステルフィルム材でできている請求項１記載の孔版印刷用原紙。
The base paper for stencil printing of Claim 1 made from the polyester film material whose thickness is 5 micrometers-20 micrometers.
JP2004167029A 2004-06-04 2004-06-04 Stencil printing base paper Pending JP2005343069A (en)

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