JPH0815824B2 - Method for manufacturing dampening roller for offset printing - Google Patents
Method for manufacturing dampening roller for offset printingInfo
- Publication number
- JPH0815824B2 JPH0815824B2 JP1176750A JP17675089A JPH0815824B2 JP H0815824 B2 JPH0815824 B2 JP H0815824B2 JP 1176750 A JP1176750 A JP 1176750A JP 17675089 A JP17675089 A JP 17675089A JP H0815824 B2 JPH0815824 B2 JP H0815824B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- roller
- alumina ceramic
- dampening roller
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Printing Plates And Materials Therefor (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、オフセット平版印刷機に使用される湿しロ
ーラの製造方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a dampening roller used in an offset lithographic printing machine.
平版表面の水と油脂の反撥作用を利用したオフセット
平版印刷機にはインキ供給装置のほかに、版面に湿し水
を付与する湿しローラが付帯している。湿しローラは、
その機能上、水との濡れ性が良く、ローラ周面にムラな
く一様な水膜が形成されることが必要である。The offset lithographic printing machine, which utilizes the repulsive action of water and oil on the surface of the lithographic plate, is equipped with a dampening roller for supplying dampening water to the plate surface in addition to the ink supply device. Dampening roller
In terms of its function, it is necessary that it has good wettability with water and that a uniform water film is formed on the peripheral surface of the roller.
従来よりその湿しローラとして、胴部周面にクロムめ
っきを施したものが使用されてきた。そのクロムめっき
面は、良好な平滑面を有し、かつ耐摩耗性にもすぐれて
いるが、水に対する濡れ性はあまり良くない（水の接触
角θ：約80°）。Conventionally, as the dampening roller, one having a chrome-plated peripheral surface of the body has been used. The chrome-plated surface has a good smooth surface and excellent wear resistance, but its wettability with water is not so good (water contact angle θ: about 80 °).
近時、その濡れ性を改良した湿しローラとして、ロー
ラ胴部の母材表面にアルミナセラミック層を溶射形成
し、表面を研削加工したセラミックローラが提案されて
いる。Recently, as a dampening roller having improved wettability, there has been proposed a ceramic roller in which an alumina ceramic layer is formed by thermal spraying on the surface of a base material of a roller body and the surface is ground.
アルミナセラミックで被覆された湿しローラの胴部表
面は水に対する良好な濡れ性を有してはいるが、その膜
面は緻密性に乏しく多数の微小ポアが存在しているた
め、有機物や印刷インキ等の異物の付着による汚染がは
げしく、使用中に濡れ性が著しく低下してしまう。溶射
皮膜に代え、焼結品を使用した場合でも、研削加工を加
えて得られる表面粗さは、精々1S程度であって、有機物
や印刷インキの付着・汚染を充分に防止し得る程の滑ら
かさ（例えば、クロムめっきローラ並みの表面粗さ）を
もたせることは不可能である。Although the surface of the body of the dampening roller coated with alumina ceramic has good wettability with water, the film surface is poor in denseness and has a large number of minute pores. Contamination due to the adhesion of foreign matter such as ink is severe and the wettability is significantly reduced during use. Even if a sintered product is used instead of the thermal spray coating, the surface roughness obtained by grinding is at most about 1S, which is smooth enough to prevent adhesion and contamination of organic substances and printing ink. It is impossible to provide the roughness (for example, the surface roughness of a chrome-plated roller).
このため、ローラ表面を再生するための洗浄処理を頻
繁に行わねばならず、ローラメンテナンスに多大のコス
トと労力を必要とし、かつ印刷能率の低下を余儀なくさ
れるという欠点があり、その実用化が妨げられている。Therefore, the cleaning process for regenerating the roller surface must be frequently performed, which requires a great deal of cost and labor for the roller maintenance, and has a drawback that the printing efficiency is inevitably reduced. Is being disturbed.
本発明は、湿しローラに関する上記問題点を解決する
ためになされたものである。The present invention has been made to solve the above-mentioned problems associated with dampening rollers.
本発明のオフセット印刷用湿しローラの製造方法は、 アルミナセラミツクからなる表面を有するローラ胴部
をガラス粉末で被覆し、ガラス粉末を加熱溶融してアル
ミナセラミツク表面の微小ポア内にガラス融液を浸潤さ
せる封孔処理を施し、冷却後その胴部表面を研削加工し
て微小ポアがガラスで封孔されたアルミナセラミックス
からなる胴部表面を形成することを特徴としている。The method for producing a dampening roller for offset printing of the present invention comprises coating a roller body having a surface made of alumina ceramic with glass powder, heating and melting the glass powder to form a glass melt in the fine pores on the surface of the alumina ceramic. It is characterized in that it is subjected to a sealing treatment for infiltration, and after cooling, the surface of the body is ground to form a body surface made of alumina ceramics with micropores sealed with glass.
ローラ胴部表面をアルミナセラミックとする湿しロー
ラは水に対する良好な濡れ性（水との接触角θ：約35〜
50°）を有しているが、前述のようにその表面は多数の
微小ポアが存在しているため、高度の研削加工を加えて
も、平滑面とすることができない。本発明は、その微小
ポアにガラスを湿潤させ微小ポアを被封することにより
凹凸をなくし、滑らかな表面をもたせている。A dampening roller whose surface is made of alumina ceramic has good wettability with water (contact angle with water θ: approx. 35 ~
However, since the surface has a large number of minute pores as described above, it cannot be made a smooth surface even if a high degree of grinding is applied. In the present invention, the fine pores are moistened with glass to seal the fine pores, thereby eliminating the unevenness and providing a smooth surface.
上記胴部表面の微小ポアを被封するガラスは特別のも
のである必要はなく、例えば石英ガラス、あるいはSi
O2,CaO,Al2O3，Na2O等を主構成分とする各種けい酸塩ガ
ラスであってよい。The glass for enclosing the micropores on the surface of the body does not have to be special, and is, for example, quartz glass or Si.
It may be various silicate glasses containing O 2 , CaO, Al 2 O 3 , Na 2 O, etc. as main constituents.
本発明の湿しローラは、アルミナセラミックからなる
表面を有するローラ胴部を、ガラス粉末で被覆し、ガラ
ス粉末を加熱溶融して適当時間保持することによりガラ
ス融液を微小ポア内に湿潤させたのち、冷却し、ついで
その表面を研削加工することにより製造される。また、
上記ガラス粉末の加熱溶融過程で、アルミナセラミック
の微小ポア内に湿潤するガラス融液は微小ポア内面と反
応（ガラス質反応相を生成）し、微小ポアとの一体的密
着状態を形成する。In the dampening roller of the present invention, the roller body having a surface made of alumina ceramic is coated with glass powder, and the glass powder is heated and melted and held for an appropriate time to wet the glass melt into the fine pores. After that, it is cooled, and then the surface thereof is ground to be manufactured. Also,
During the heating and melting process of the glass powder, the glass melt that wets the fine pores of the alumina ceramic reacts with the inner surface of the fine pores (generates a vitreous reaction phase) to form an integrated close contact state with the fine pores.
ローラ胴部の表面をなすアルミナセラミックは、適宜
の胴部母材（例えば、鋼製円筒体）に溶射法により形成
したものであってよく、また円筒形状の焼結品であって
よい。The alumina ceramic that forms the surface of the roller body may be formed by a thermal spraying method on an appropriate body material of the body (for example, a steel cylinder), or may be a cylindrical sintered product.
胴部表面のアルミナセラミックに対するガラス湿潤処
理によるガラスの湿潤深さは、概ね数mm（例えば２〜5m
m）であってよい。The wetting depth of the glass by the glass wetting treatment on the alumina ceramic of the body surface is about several mm (for example, 2 to 5 m).
m).
ガラス湿潤処理後の研削加工は、代表的には円筒研削
盤上、ダイヤモンド砥石を用いて行われる。研削加工代
は、例えば0.5〜2mm程度であってよい。The grinding process after the glass wetting treatment is typically performed on a cylindrical grinder using a diamond grindstone. The grinding allowance may be, for example, about 0.5 to 2 mm.
ローラ胴部のアルミナセラミックの微小ポアがガラス
により被封されることにより、微小ポアによる表面凹凸
が消去され、研削加工により、例えば従来のクロムめっ
きローラと同等ないしそれ以上の滑らかな表面（表面粗
さ：例えば0.3S以下）が与えられる。By enclosing the alumina ceramic micropores in the roller body with glass, surface irregularities due to the micropores are erased, and by grinding, for example, a smooth surface (surface roughness equal to or better than that of a conventional chrome-plated roller) is obtained. S: For example, 0.3S or less) is given.
また、ガラスは水との濡れ性が良く（接触角θ＝
０）、アルミナセラミック表面の濡れ性を損なうことは
ない。そのローラ胴部表面は水に対する良好な濡れ性
（接触角θ：約30〜40°）を有し、均一な水膜が形成さ
れることにより、版胴表面に対する安定した給水機能を
果たす。Further, glass has good wettability with water (contact angle θ =
0), the wettability of the alumina ceramic surface is not impaired. The surface of the roller body has a good wettability with water (contact angle θ: about 30 to 40 °), and a uniform water film is formed, so that the surface of the plate cylinder has a stable water supply function.
更に、アルミナセラミックおよびその微小ポアを被封
するガラスは極めて硬質であることにより、胴部表面は
高耐摩耗性を帯有している。Further, since the alumina ceramic and the glass that seals the micropores are extremely hard, the body surface has a high wear resistance.
ローラ胴部材 アルミナセラミック焼結円筒体（外径:70mm,胴長:50
0）。空隙率:8.9％。外周面表面粗さ：約1S。Roller body member Alumina ceramic sintered cylinder (outer diameter: 70 mm, body length: 50
0). Porosity: 8.9%. Outer surface roughness: approx. 1S.
ガラス粉末 炭酸カルシウム粉末、シリカ粉末、およびアルミナ粉
末の混合物（CaO:Al2O3，SiO2のモル比＝1:1:2）をバッ
チ炉中、1600℃で加熱溶融した後、水冷し、その固化物
を粉砕し、粒径１〜10mmのガラス粉末とした。Glass powder A mixture of calcium carbonate powder, silica powder, and alumina powder (CaO: Al 2 O 3 , SiO 2 molar ratio = 1: 1: 2) was heated and melted at 1600 ° C. in a batch furnace, followed by water cooling, The solidified product was crushed to obtain glass powder having a particle size of 1 to 10 mm.
上記ガラス粉末を耐火物製ベッセルに入れ、ガラス粉
末中にローラ胴部材であるアルミナセラミック焼結円筒
体を埋覆したうえ、1500℃の雰囲気炉内でガラス粉末を
溶融し、１時間を要してガラス融液を湿潤させた。The glass powder was placed in a refractory vessel, the alumina ceramic sintered cylinder that was the roller body member was embedded in the glass powder, and the glass powder was melted in an atmosphere furnace at 1500 ° C., and it took 1 hour. To wet the glass melt.
ガラス湿潤処理後、円筒研削盤上でダイヤモンド砥石
による研削加工を加えた。After the glass wet treatment, a grinding process with a diamond grindstone was applied on a cylindrical grinder.
得られたローラ胴部の表面性状測定結果を第１表に示
す。比較材は、アルミナセラミック焼結円筒体（ガラス
湿潤処理なし）の表面に上記と同じ研削加工を加えたも
のである。Table 1 shows the measurement results of the surface properties of the obtained roller body. The comparative material is the same as the above-mentioned grinding process applied to the surface of an alumina ceramic sintered cylinder (without glass wetting treatment).
第１表 発明例 比較例 表面粗さ :0.2S 1S 水の接触角（θ） :35° 45° 表面硬度（VH） :1350 1350 〔発明の効果〕 本発明のオフセット印刷用湿しローラは、従来のクロ
ムめっきローラ（水の接触角θ：約80°）に比しすぐれ
た濡れ性を有している。しかも、その表面のアルミナセ
ラミックは、微小ポアがガラスで被封されているので平
滑・緻密性にすぐれており、実使用中の有機物や印刷イ
ンキの付着汚染を生じにくく、版胴に対する安定した給
水機能を維持する。また、長期使用により表面の汚染が
生じた場合でも、微小ポアの多数存在する場合のような
洗浄の困難はなく、軽い水洗いにより簡単にしかも完全
に清浄な表面に回復させることができる。従って、ロー
ラメンテナンスの大幅な軽減と印刷能率および印刷品質
の向上等に大きな効果が得られる。Table 1 Invention Example Comparative Example Surface roughness: 0.2S 1S Water contact angle (θ): 35 ° 45 ° Surface hardness (VH): 1350 1350 [Effect of the invention] The dampening roller for offset printing of the present invention is It has better wettability than conventional chrome-plated rollers (water contact angle θ: about 80 °). Moreover, the alumina ceramic on the surface has excellent smoothness and compactness because the micropores are sealed with glass, and it is unlikely that organic substances or printing ink will actually adhere to the printing cylinder during actual use, resulting in stable water supply to the plate cylinder. Keep functioning. Further, even if the surface is contaminated due to long-term use, there is no difficulty of cleaning as in the case where a large number of micropores are present, and a light surface can be easily and completely restored to a clean surface. Therefore, it is possible to greatly reduce the roller maintenance and to greatly improve the printing efficiency and the printing quality.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−84395（ＪＰ，Ａ) 実願昭61−25451号（実開昭62−136353 号）の願書に添付した明細書及び図面の内 容を撮影したマイクロフィルム（ＪＰ, Ｕ) ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-2-84395 (JP, A) Japanese Patent Application No. 61-25451 (Japanese Utility Model Application No. 62-136353) Micro film (JP, U)
Claims (1)
ローラ胴部をガラス粉末で被覆し、ガラス粉末を加熱溶
融してアルミナセラミツク表面の微小ポア内にガラス融
液を浸潤させる封孔処理を施し、冷却後その胴部表面を
研削加工して微小ポアがガラスで封孔されたアルミナセ
ラミックスからなる胴部表面を形成することを特徴とす
るオフセット印刷用湿しローラの製造方法。1. A roller body having a surface made of alumina ceramic is coated with glass powder, and the glass powder is heated and melted to carry out a sealing treatment for infiltrating a glass melt into the fine pores on the surface of the alumina ceramic, followed by cooling. After that, the surface of the body is ground to form a body surface made of alumina ceramic in which micropores are sealed with glass, thereby forming a dampening roller for offset printing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1176750A JPH0815824B2 (en) | 1989-07-07 | 1989-07-07 | Method for manufacturing dampening roller for offset printing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1176750A JPH0815824B2 (en) | 1989-07-07 | 1989-07-07 | Method for manufacturing dampening roller for offset printing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0342290A JPH0342290A (en) | 1991-02-22 |
| JPH0815824B2 true JPH0815824B2 (en) | 1996-02-21 |
Family
ID=16019156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1176750A Expired - Lifetime JPH0815824B2 (en) | 1989-07-07 | 1989-07-07 | Method for manufacturing dampening roller for offset printing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0815824B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69614343T2 (en) * | 1995-10-30 | 2002-05-16 | Bando Chemical Industries Ltd., Kobe | Load-bearing element of a belt, production method therefor and belt comprising this |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62136353U (en) * | 1986-02-24 | 1987-08-27 | ||
| JPH0698851B2 (en) * | 1988-06-15 | 1994-12-07 | 新日本製鐵株式会社 | Damping water supply roller for lithographic printing machine |
-
1989
- 1989-07-07 JP JP1176750A patent/JPH0815824B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0342290A (en) | 1991-02-22 |
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