JP2005007812A - Offset printing continuous water feeding rubber roller - Google Patents

Offset printing continuous water feeding rubber roller Download PDF

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Publication number
JP2005007812A
JP2005007812A JP2003176882A JP2003176882A JP2005007812A JP 2005007812 A JP2005007812 A JP 2005007812A JP 2003176882 A JP2003176882 A JP 2003176882A JP 2003176882 A JP2003176882 A JP 2003176882A JP 2005007812 A JP2005007812 A JP 2005007812A
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Japan
Prior art keywords
rubber
rubber layer
hardness
jis
water supply
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JP2003176882A
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Japanese (ja)
Inventor
Tadao Mobara
忠男 茂原
Toshimichi Ishida
俊道 石田
Noriyuki Honda
敬之 本田
Takahiro Kataoka
隆博 片岡
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KATSURA ROLLER SEISAKUSHO KK
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KATSURA ROLLER SEISAKUSHO KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an offset printing continuous water feeding rubber roller which does not require the adjustment of a nip width over a long period of time. <P>SOLUTION: This offset printing continuous water feeding rubber roller is formed by lining a rubber layer having a double layer structure comprising a lower winding rubber layer 11 and an upper winding rubber layer 12 on a core material 10 under the condition that the lower winding rubber layer has is a rubber layer having a JIS-A hardness of not more than 30° and a thickness of at least 60% of the total thickness of the rubber layers and the upper winding rubber layer is a rubber layer including at least 15 wt.% of a plasticizer and having a JIS-A hardness of at least 40° and a thickness of below 40% of the total thickness of the rubber layers. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、オフセット印刷用連続給水ゴムローラに関するものである。
【０００２】
【従来の技術】
従来、オフセット印刷機は図３に示すように、インキによって図柄等を形成するため表面にフォトレジスト処理を施したアルミニウム製の板等の刷版２を装着した大型のローラ（版胴）１と、前記刷版２からインキを受け取り、紙に転写するゴム板を巻回した大口径のローラ（ブランケット胴）３と、前記刷版２にインキを供給する複数の小径インキローラ群４、刷版２の非画線部に水を供給する小径の連続給水ゴムローラ７等からなる湿し水供給装置６とで構成されている。なお、５はインキ壺、８はクロムローラ、９は給水スプレーである。
【０００３】
そして、前記給水ゴムローラ７は、刷版２上のインキに接触しているため、耐インキ性を具備する必要があり、一般に、アクリロニトリルブタジエンゴム（ＮＢＲ）を主体に充填剤（５〜１５重量％）とフタル酸エステルやキシレン樹脂等の可塑剤（２０〜４０重量％）を加えた単層の合成ゴムで作られている。
【０００４】
また、給水ゴムローラ７は刷版２へ安定して最適な水量を供給するため、刷版２に所定圧力（たとえば、線圧０．５〜１．０ｋｇ／ｃｍ）で所定ニップ巾（たとえば、６〜８ｍｍ）となるように押圧する必要がある。
【０００５】
そのため、従来においては、前記給水ゴムローラ７はその硬度（ＪＩＳ−Ａ）を２０°〜２５°としている。
【０００６】
【非特許文献１】
「オフセット印刷技術−作業基本マニュアル」 社団法人日本印刷技術協会、１９９４年４月２５日発行、１８９，１９０頁。
【０００７】
【発明が解決しようとする課題】
ところで、前記構成のオフセッ印刷機で印刷を行なっていると、前記給水ゴムローラ７は使用につれてその直径が収縮し、設定押し込み量では所定のニップ巾が得られなくなり、所定の印刷品質を得られなくなる。そのため頻繁に給水ゴムローラ７の刷版２等への押し込み量を押し込み付与手段（図示せず）で調整しなければならず、作業性は勿論、生産効率が悪いという問題を有していた。
【０００８】
その原因について検討した結果、前述した通り、給水ゴムローラ７にはフタル酸エステルやキシレン樹脂等の可塑剤が２０〜４０重量％含有しているが、この可塑剤がインキおよび洗浄剤や湿し水により給水ゴムローラ７から抽出され、その結果、給水ゴムローラ７の直径が収縮するためであることが判明した。
【０００９】
したがって、本発明は、経時的に直径の収縮が少ないオフセット印刷用連続給水ゴムローラを提供することを目的とする。
【００１０】
【課題を解決するための手段】
本発明は前記目的を達成するために、請求項１の発明では、給水ゴムローラを、従来、単層であったゴム層を、下巻きゴム層と上巻きゴム層とし、下巻きゴム層を従来のものより軟質の硬度（ＪＩＳ−Ａ）３０°以下のものとし、上巻きゴム層の可塑剤含有率を１５重量％以下（好ましくは零）とすることにより硬度（ＪＩＳ−Ａ）が４０°以上の従来のものより硬質のものとする。すなわち、インキ等に直接接触する上巻きゴム層の可塑剤含有率を少なく（好ましくは零）して可塑剤のインキ等による抽出量を少なくして給水ゴムローラの直径の収縮を出来るだけなくすようにしたものである。
【００１１】
また、請求項２の発明では、可塑剤ではないが、可塑剤と同効を奏し、抽出性が殆どない液状ポリマーの存在に着目し、給水ゴムローラを、下巻きゴム層と上巻きゴム層とし、下巻きゴム層を軟質の硬度（ＪＩＳ−Ａ）３０°以下のものとするとともに、上巻きゴム層に非抽出性である液状ポリマーを使用して硬度（ＪＩＳ−Ａ）を４０°以上とする。すなわち、インキ等に直接接触する上巻きゴム層には抽出性のある可塑剤を含有しないため、給水ゴムローラの直径の収縮は殆どないものとしたものである。
【００１２】
さらに、前記各発明の給水ゴムローラにおいては、上巻きゴム層は硬いものの、柔軟性のある下巻きゴム層の厚さを両ゴム層の合計厚みの６０％以上と硬い上巻きゴム層の厚さより大とすることにより、全体として所定の柔軟性をもたせ、所定線圧で所定ニップ巾を得るようにしたものである。
【００１３】
【発明の実施の形態】
つぎに、本発明にかかるオフセット印刷用連続給水ゴムローラ７について、図１にしたがって説明する。
【００１４】
図１において、１０は給水ゴムローラ７の鉄芯で、１１は下巻きゴム層、１２は上巻きゴム層である。
【００１５】
前記下巻きゴム層１１は、可塑剤含有率を比較的高くして硬度（ＪＩＳ−Ａ）を３０°以下とした軟質ゴムからなる。
【００１６】
また、前記上巻きゴム層１２は、可塑剤含有率を１５重量％以下、好ましくは零とすることにより硬度（ＪＩＳ−Ａ）を４０°以上とし、従来の単層構造の給水ゴムローラより硬い硬質ゴムとしてある。
【００１７】
そして、下巻きゴム層１１の厚さは、両ゴム層１１，１２の合計厚みの６０％以上、上巻きゴム層１２の厚さは両ゴム層１１，１２の合計厚みの４０％未満となっている。但し、上巻きゴム層１２の厚みは、ゴムローラ製作上、２ｍｍ以上であることが好ましい。
【００１８】
つぎに、上下二層ゴム構造の給水ゴムローラと単層ゴム構造の給水ゴムローラにおいて、その硬度、厚みと線圧−ニップ巾特性について検討した。検討給水ゴムローラは、その直径が５０ｍｍの鉄芯１０に、
イ．硬度（ＪＩＳ−Ａ）５０°、厚さ３ｍｍの上巻きゴム層１２と、硬度（ＪＩＳ−Ａ）２０°、厚さ７ｍｍの下巻きゴム層１１とからなる本発明品ａと、
ロ．硬度（ＪＩＳ−Ａ）３０°、厚さ１０ｍｍの単層からなる従来品である第１比較品ｂと、
ハ．硬度（ＪＩＳ−Ａ）５０°、厚さ１０ｍｍの単層からなる第２比較品ｃと、
ニ．硬度（ＪＩＳ−Ａ）５０°、厚さ５ｍｍの上巻きゴム層と、硬度（ＪＩＳ−Ａ）２０°、厚さ５ｍｍの下巻きゴム層とからなる第３比較品ｄ
の４種類の給水ゴムローラについて、そのニップ巾−線圧特性を測定したところ、図２に示す結果となった。
【００１９】
すなわち、本発明品ａは現在使用されている第１比較品ｂと同様の特性を示し何ら問題なく使用できるのに対し、第２比較品ｃでは、第１比較品ｂと同一線圧で押さえるとニップ巾は非常に小さくなり、最適な水量を供給するための調整範囲が殆どなく、良好な印刷ができないばかりか、所定のニップ巾を確保するため線圧を大にすると水の供給量が少なくなり、必要な水量を供給することができなくなる。また、第３比較品ｄのように、ゴム層を本発明品ａと同様硬度のゴムで二層構造としても両ゴム層の厚さを各々５ｍｍと、上巻きゴム層の厚さが全体厚さの４０％以上となれば、単層のものに近い特性となり、適正なニップ巾を確保することができない。
【００２０】
したがって、本発明品ａにおいて、所定線圧で所定ニップ巾を確保するためには、他の実験結果等を考慮して上巻きゴム層の厚さは両ゴム層の合計厚みの４０％未満にする必要がある。
【００２１】
つぎに、可塑剤の含有量とインキに対する抵抗性（抽出性）を、ゴムに対する可塑剤含有率を、０重量％， １０．０重量％， １５．０重量％， ２０．０重量％， ３０．０重量％とした５ｇ立方体のゴムブロックをインキに浸漬し室内（室温２０℃）に置き、１５日後、３０日後に取り出してその重量を測定し、その重量変化（パーセント）を調べたところ、表１に示す結果となった。
【００２２】
【表１】

Figure 2005007812
【００２３】
また、可塑剤ではないが、前記可塑剤と同効を奏する添加剤として、たとえば、液状ＮＢＲ（ニトリルゴム系）、液状ＣＲ（ネオプレンゴム系）、液状ＢＲ（ブタジエン系）、液状ウレタン（ポリエステル系、ポリエーテル系）等の液状ポリマーがある。そして、この液状ポリマーはゴム中に添加しても非抽出性を示す。
【００２４】
そこで、前記可塑剤の代りに液状ポリマー（たとえば、液状ＮＢＲ）を添加したゴムを、前述の可塑剤含有ゴムブロックと同様条件でインキに浸漬してその重量変化（パーセント）を調べたところ、表２に示す結果となり、インキに対して優れた抵抗性を示すことが判明した。
【００２５】
【表２】
Figure 2005007812
【００２６】
すなわち、上巻きゴム層はその可塑剤含有率が１５重量％以下であれば、可塑剤の抽出による重量の変化が少なく、また、可塑剤の代りに液状ポリマーを添加した上巻きゴム層でも液状ポリマーの抽出による重量の変化が少なく、インキに対して優れた抵抗性を示すことが判明した。このことは使用中に、給水ゴムローラの直径が収縮しにくいことを示している。なお、湿し水に対しても同様効果を奏した。
【００２７】
しかしながら、可塑剤の含有率を１５重量％以下あるいは液状ポリマーのみを添加して硬度（ＪＩＳ−Ａ）を４０°以上としたゴムは、従来の給水ゴムローラの硬度（ＪＩＳ−Ａ）より高いため、硬度（ＪＩＳ−Ａ）４０°以上の前記ゴムを単層で構成した給水ゴムローラは、刷版２、その他のロール（クロムローラ８）に対して所定の線圧で所定のニップ巾を設定することはできない。
【００２８】
したがって、本発明においては、上巻きゴム層を硬度（ＪＩＳ−Ａ）４０°以上とするものの下巻きゴム層に軟質ゴムを適用することにより全体として十分な柔軟性を付与することで刷版２等に対し所定線圧で所定のニップ巾を得るようにしたものである。
【００２９】
なお、前述の上巻きゴム層において、可塑剤を含有させる場合においても、若干の液状ポリマーを添加してもよいことは勿論である。
【００３０】
【発明の効果】
以上の説明で明らかなように、本発明によれば、給水ゴムローラにおいて、前記上巻きゴム層が、可塑剤含有率が１５重量％以下（好ましくは零）のゴム材（請求項１の発明）、あるいは、可塑剤の代りに液状ポリマーを添加したゴム材（請求項２の発明）であるため、使用中に、インキや湿し水により可塑剤等の抽出による給水ゴムローラの直径の収縮にもとづく線圧、ニップ巾の変化は極めて少なく、従来においては、１ヶ月毎にニップ巾を調整する必要があったが、上巻きゴム層の硬度（ＪＩＳ−Ａ）が５０°で可塑剤含有率が零のもの、あるいは可塑剤の代りに液状ポリマーを添加したものでは使用６ヶ月経ても調整作業を必要とせず、また、上巻きゴム層の硬度（ＪＩＳ−Ａ）が５０°で可塑剤含有率１５重量％のものでも使用４ヶ月間は調整作業を必要としないという効果を奏する。
【００３１】
しかも、芯材にライニング加工するゴム層を、下巻きゴム層と上巻きゴム層との二層構造とし、前記下巻きゴム層を硬度（ＪＩＳ−Ａ）が３０°以下で前記両ゴム層の全体厚さの６０％以上とし、前記上巻きゴム層を硬度（ＪＩＳ−Ａ）４０°以上で前記両ゴム層の全体厚さの４０％未満としたので、給水ゴムローラの表面硬度は従来のものより硬いが、下巻きゴム層を硬度（ＪＩＳ−Ａ）３０°以下と軟らかく、しかもその厚さを両ゴム層の合計厚さの６０％以上と厚くして全体として従来の給水ゴムローラと同等の柔軟性になるようにしたことから所定線圧で所定ニップ巾を得ることができる。
【００３２】
なお、表面硬度が前述のように従来の給水ゴムローラより硬いため、使用中にインキ滓や紙粉等が給水ゴムローラの表面に食い込みがなく、固着することがない。したがって、給水ゴムローラの表面への異物付着現象がなく、仮に付着しても食い込みがないため洗浄作業性が良好であるという効果も奏する。
【図面の簡単な説明】
【図１】本発明にかかる給水ゴムローラの断面図。
【図２】線圧−ニップ巾特性図。
【図３】オフセット印刷機の概略図。
【符号の説明】
７〜給水ゴムローラ、１０〜芯材、１１〜下巻きゴム層、１２〜上巻きゴム層。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a continuous water supply rubber roller for offset printing.
[0002]
[Prior art]
Conventionally, as shown in FIG. 3, an offset printing machine has a large roller (plate cylinder) 1 equipped with a printing plate 2 such as an aluminum plate whose surface is subjected to a photoresist process in order to form a pattern or the like with ink. A large-diameter roller (blanket cylinder) 3 around which a rubber plate that receives ink from the printing plate 2 and transfers it to paper is wound, a plurality of small-diameter ink rollers 4 that supply ink to the printing plate 2, and the printing plate And a dampening water supply device 6 including a small-diameter continuous water supply rubber roller 7 for supplying water to the two non-image portions. In addition, 5 is an ink fountain, 8 is a chrome roller, 9 is a water supply spray.
[0003]
Since the water supply rubber roller 7 is in contact with the ink on the printing plate 2, it is necessary to have ink resistance. Generally, a filler (5 to 15% by weight) mainly composed of acrylonitrile butadiene rubber (NBR) is used. ) And a plasticizer (20 to 40% by weight) such as a phthalate ester or a xylene resin.
[0004]
Further, the water supply rubber roller 7 stably supplies an optimal amount of water to the printing plate 2 so that the printing plate 2 is supplied with a predetermined pressure (for example, a linear pressure of 0.5 to 1.0 kg / cm) and a predetermined nip width (for example, 6 It is necessary to press so that it may become (-8mm).
[0005]
Therefore, conventionally, the water supply rubber roller 7 has a hardness (JIS-A) of 20 ° to 25 °.
[0006]
[Non-Patent Document 1]
"Offset printing technology-basic work manual" Japan Printing Technology Association, published on April 25, 1994, pages 189, 190.
[0007]
[Problems to be solved by the invention]
By the way, when printing is performed with the offset printing press having the above-described configuration, the diameter of the water supply rubber roller 7 is reduced as it is used, and a predetermined nip width cannot be obtained with a set pushing amount, and a predetermined print quality cannot be obtained. . For this reason, the amount of pressing of the water supply rubber roller 7 into the printing plate 2 or the like must be frequently adjusted by a pressing and imparting means (not shown), and there is a problem that not only the workability but also the production efficiency is poor.
[0008]
As a result of examining the cause, as described above, the water supply rubber roller 7 contains 20 to 40% by weight of a plasticizer such as a phthalate ester or a xylene resin. As a result, it was found that the diameter of the water supply rubber roller 7 was contracted.
[0009]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a continuous water supply rubber roller for offset printing whose diameter shrinks little over time.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, the water supply rubber roller according to the first aspect of the present invention includes a conventional rubber layer that is a single layer, a lower rubber layer and an upper rubber layer. Hardness (JIS-A) is 30 ° or less, and the plasticizer content of the upper rubber layer is 15% by weight or less (preferably zero) so that the hardness (JIS-A) is 40 °. Harder than the above conventional ones. That is, the plasticizer content of the overwrapped rubber layer that is in direct contact with ink or the like is reduced (preferably zero) to reduce the amount of plasticizer extracted by ink or the like so that the diameter of the water supply rubber roller is reduced as much as possible. It is a thing.
[0011]
Further, in the invention of claim 2, paying attention to the presence of a liquid polymer which is not a plasticizer but has the same effect as a plasticizer and has almost no extractability, the water supply rubber roller is made into a lower wound rubber layer and an upper wound rubber layer. The lower wound rubber layer has a soft hardness (JIS-A) of 30 ° or less, and the upper wound rubber layer uses a non-extractable liquid polymer to have a hardness (JIS-A) of 40 ° or more. To do. That is, the upper rubber layer that is in direct contact with ink or the like does not contain an extractable plasticizer, so that the diameter of the water supply rubber roller is hardly contracted.
[0012]
Furthermore, in the water supply rubber roller of each of the inventions, although the upper wound rubber layer is hard, the thickness of the flexible lower wound rubber layer is 60% or more of the total thickness of both rubber layers and the thickness of the hard upper wound rubber layer. By making it large, the entire body is provided with a predetermined flexibility, and a predetermined nip width is obtained with a predetermined linear pressure.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, the continuous water supply rubber roller 7 for offset printing according to the present invention will be described with reference to FIG.
[0014]
In FIG. 1, 10 is an iron core of the water supply rubber roller 7, 11 is a lower wound rubber layer, and 12 is an upper wound rubber layer.
[0015]
The lower rubber layer 11 is made of a soft rubber having a relatively high plasticizer content and a hardness (JIS-A) of 30 ° or less.
[0016]
The upper rubber layer 12 has a plasticizer content of 15% by weight or less, preferably zero, so that the hardness (JIS-A) is 40 ° or more, and is harder than a conventional single layer structure water supply rubber roller. As rubber.
[0017]
The thickness of the lower rubber layer 11 is 60% or more of the total thickness of both rubber layers 11 and 12, and the thickness of the upper rubber layer 12 is less than 40% of the total thickness of both rubber layers 11 and 12. ing. However, the thickness of the upper wound rubber layer 12 is preferably 2 mm or more in terms of rubber roller production.
[0018]
Next, the hardness, thickness, and linear pressure-nip width characteristics of the water supply rubber roller having the upper and lower two-layer rubber structure and the water supply rubber roller having the single-layer rubber structure were examined. Consider the water supply rubber roller to the iron core 10 whose diameter is 50 mm,
I. The product a of the present invention comprising an upper rubber layer 12 having a hardness (JIS-A) of 50 ° and a thickness of 3 mm, and an lower rubber layer 11 of a hardness (JIS-A) of 20 ° and a thickness of 7 mm;
B. A first comparative product b, which is a conventional product consisting of a single layer having a hardness (JIS-A) of 30 ° and a thickness of 10 mm;
C. A second comparative product c consisting of a single layer having a hardness (JIS-A) of 50 ° and a thickness of 10 mm;
D. Third comparative product d comprising an upper wound rubber layer having a hardness (JIS-A) of 50 ° and a thickness of 5 mm, and an under wound rubber layer of hardness (JIS-A) of 20 ° and a thickness of 5 mm.
When the nip width-linear pressure characteristics of the four types of water supply rubber rollers were measured, the results shown in FIG. 2 were obtained.
[0019]
That is, the product a of the present invention exhibits the same characteristics as the first comparative product b that is currently used and can be used without any problem, whereas the second comparative product c is pressed with the same linear pressure as the first comparative product b. The nip width becomes very small, and there is almost no adjustment range for supplying the optimal amount of water, and not only good printing is possible, but if the linear pressure is increased to ensure a predetermined nip width, the amount of water supplied will be reduced. As a result, the required amount of water cannot be supplied. Further, as in the third comparative product d, even if the rubber layer is made of rubber having the same hardness as the product a of the present invention and has a two-layer structure, the thickness of both rubber layers is 5 mm and the thickness of the upper wound rubber layer is the total thickness. If it is 40% or more, the characteristics are close to those of a single layer, and an appropriate nip width cannot be secured.
[0020]
Therefore, in the product a of the present invention, in order to ensure a predetermined nip width with a predetermined linear pressure, the thickness of the upper wound rubber layer is less than 40% of the total thickness of both rubber layers in consideration of other experimental results. There is a need to.
[0021]
Next, the plasticizer content and the resistance to ink (extractability), and the plasticizer content to the rubber are 0 wt%, 10.0 wt%, 15.0 wt%, 20.0 wt%, 30 A 5 g cubic rubber block of 0.0% by weight was immersed in ink and placed in a room (room temperature 20 ° C.). After 15 days and 30 days, the weight was measured and the weight was measured. The results shown in Table 1 were obtained.
[0022]
[Table 1]
Figure 2005007812
[0023]
Further, although not a plasticizer, examples of the additive having the same effect as the plasticizer include, for example, liquid NBR (nitrile rubber type), liquid CR (neoprene rubber type), liquid BR (butadiene type), liquid urethane (polyester type). , Polyether type) and the like. And even if this liquid polymer is added to rubber, it exhibits non-extractability.
[0024]
Accordingly, when a rubber added with a liquid polymer (for example, liquid NBR) instead of the plasticizer was immersed in ink under the same conditions as the plasticizer-containing rubber block, the weight change (percentage) was examined. The result shown in Fig. 2 was found to show excellent resistance to ink.
[0025]
[Table 2]
Figure 2005007812
[0026]
In other words, if the plasticizer content of the overwound rubber layer is 15% by weight or less, the weight change due to extraction of the plasticizer is small, and the overwound rubber layer to which a liquid polymer is added instead of the plasticizer is also liquid. It has been found that there is little change in weight due to extraction of the polymer, and it exhibits excellent resistance to ink. This indicates that the diameter of the water supply rubber roller does not easily shrink during use. In addition, the same effect was exhibited with respect to the fountain solution.
[0027]
However, the rubber having a plasticizer content of 15% by weight or less or having only a liquid polymer added to have a hardness (JIS-A) of 40 ° or higher is higher than the hardness of a conventional water supply rubber roller (JIS-A). For a water supply rubber roller composed of a single layer of the rubber having a hardness (JIS-A) of 40 ° or more, a predetermined nip width is set at a predetermined linear pressure with respect to the printing plate 2 and other rolls (chrome roller 8). I can't.
[0028]
Therefore, in the present invention, the printing plate 2 can be provided with sufficient flexibility as a whole by applying a soft rubber to the lower wound rubber layer having an upper wound rubber layer having a hardness (JIS-A) of 40 ° or more. For example, a predetermined nip width is obtained with a predetermined linear pressure.
[0029]
Of course, a slight amount of liquid polymer may be added to the above-described overwrapped rubber layer even when a plasticizer is contained.
[0030]
【The invention's effect】
As apparent from the above description, according to the present invention, in the water supply rubber roller, the upper wound rubber layer is a rubber material having a plasticizer content of 15% by weight or less (preferably zero) (invention of claim 1). Alternatively, since it is a rubber material added with a liquid polymer instead of a plasticizer (invention of claim 2), it is based on the shrinkage of the diameter of the water supply rubber roller by extraction of the plasticizer with ink or fountain solution during use. Changes in linear pressure and nip width are very small, and conventionally it was necessary to adjust the nip width every month. However, the hardness of the top wound rubber layer (JIS-A) was 50 ° and the plasticizer content was No adjustment or adjustment is required even after 6 months of use with zero or the addition of a plastic polymer instead of a plasticizer, and the hardness of the top wound rubber layer (JIS-A) is 50 ° and the plasticizer content Use even 15% by weight There is an effect that adjustment work is not required during the month.
[0031]
In addition, the rubber layer to be lined on the core material has a two-layer structure of a lower wound rubber layer and an upper wound rubber layer, and the lower wound rubber layer has a hardness (JIS-A) of 30 ° or less and the both rubber layers The surface hardness of the water supply rubber roller is conventional because the upper rubber layer has a hardness (JIS-A) of 40 ° or more and less than 40% of the total thickness of both rubber layers. Although it is harder, the lower wound rubber layer is soft with a hardness (JIS-A) of 30 ° or less, and its thickness is increased to 60% or more of the total thickness of both rubber layers, so that it is equivalent to the conventional water supply rubber roller as a whole. Since it becomes flexible, a predetermined nip width can be obtained with a predetermined linear pressure.
[0032]
In addition, since the surface hardness is harder than the conventional water supply rubber roller as described above, ink fountain, paper powder, etc. do not bite into the surface of the water supply rubber roller during use and do not adhere. Therefore, there is no foreign matter adhesion phenomenon on the surface of the water supply rubber roller, and there is no bite even if it adheres, so that the cleaning workability is excellent.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a water supply rubber roller according to the present invention.
FIG. 2 is a characteristic diagram of linear pressure-nip width.
FIG. 3 is a schematic diagram of an offset printing machine.
[Explanation of symbols]
7 to water supply rubber roller, 10 to core material, 11 to lower wound rubber layer, 12 to upper wound rubber layer.

Claims (2)

芯材にライニング加工するゴム層を、下巻きゴム層と上巻きゴム層の二層構造とし、前記下巻きゴム層を硬度（ＪＩＳ−Ａ）が３０°以下で前記両ゴム層の合計厚さの６０％以上の厚さとする一方、前記上巻きゴム層を可塑剤含有率を１５重量％以下とすることにより硬度（ＪＩＳ−Ａ）を４０°以上とし、かつ、その厚さを前記両ゴム層の合計厚さの４０％未満としたことを特徴とするオフセット印刷用連続給水ゴムローラ。The rubber layer lining the core material has a two-layer structure of a lower wound rubber layer and an upper wound rubber layer, and the lower wound rubber layer has a hardness (JIS-A) of 30 ° or less and the total thickness of both rubber layers. The upper rubber layer is made to have a plasticizer content of 15% by weight or less so that the hardness (JIS-A) is 40 ° or more, and the thickness is set to the above two rubbers. A continuous water supply rubber roller for offset printing, characterized by being less than 40% of the total thickness of the layers. 芯材にライニング加工するゴム層を、下巻きゴム層と上巻きゴム層の二層構造とし、前記下巻きゴム層を硬度（ＪＩＳ−Ａ）が３０°以下で前記両ゴム層の合計厚さの６０％以上の厚さとする一方、前記上巻きゴム層を液状ポリマーの使用により非抽出性とし、硬度（ＪＩＳ−Ａ）を４０°以上とし、その厚さを前記両ゴム層の合計厚さの４０％未満としたことを特徴とするオフセット印刷用連続給水ゴムローラ。The rubber layer lining the core material has a two-layer structure of a lower wound rubber layer and an upper wound rubber layer, and the lower wound rubber layer has a hardness (JIS-A) of 30 ° or less and the total thickness of both rubber layers. On the other hand, the upper rubber layer is made non-extractable by using a liquid polymer, the hardness (JIS-A) is 40 ° or more, and the thickness is the total thickness of the two rubber layers. A continuous water supply rubber roller for offset printing, characterized by being less than 40%.
JP2003176882A 2003-06-20 2003-06-20 Offset printing continuous water feeding rubber roller Pending JP2005007812A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110239202A (en) * 2019-06-26 2019-09-17 云南卓印科技有限公司 A kind of lithographic printing rubber damping roller and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110239202A (en) * 2019-06-26 2019-09-17 云南卓印科技有限公司 A kind of lithographic printing rubber damping roller and preparation method thereof

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