EP0734883B1 - Procédé pour le traitement de surfaces en aluminium pour plaques d'impression - Google Patents

Procédé pour le traitement de surfaces en aluminium pour plaques d'impression Download PDF

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Publication number
EP0734883B1
EP0734883B1 EP19960105119 EP96105119A EP0734883B1 EP 0734883 B1 EP0734883 B1 EP 0734883B1 EP 19960105119 EP19960105119 EP 19960105119 EP 96105119 A EP96105119 A EP 96105119A EP 0734883 B1 EP0734883 B1 EP 0734883B1
Authority
EP
European Patent Office
Prior art keywords
abrasive
less
graining
slurry
aluminum
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
Application number
EP19960105119
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German (de)
English (en)
Other versions
EP0734883A1 (fr
Inventor
Toru c/o Fuji Photo Film Co. Ltd. Yamazaki
Hiroshi c/o Fuji Photo Film Co. Ltd. Fukuta
Hirotaro c/o Fuji Photo Film Co. Ltd. Hosoe
Tsutomu C/O Fuji Photo Film Co. Ltd. Kakei
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Publication of EP0734883A1 publication Critical patent/EP0734883A1/fr
Application granted granted Critical
Publication of EP0734883B1 publication Critical patent/EP0734883B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/04—Graining or abrasion by mechanical means

Definitions

  • the present invention relates to a method for treating the surface of an aluminum support for a printing plate, and particularly to a method for treating the surface of an aluminum support which is low in running costs and excellent in printing performance.
  • An aluminum plate has been widely used as a support for a lithographic printing plate, and a treatment of roughening the surface of the support, that is, a so-called graining treatment has been given thereto in order to improve the adherence between the support and a photosensitive layer and to give water retentivity to a non-picture portion.
  • the wire graining is also apt to make graining uneven, and therefore it is seldom used currently.
  • supports excellent in performance can be obtained continuously by brushing aluminum supports by means of a rotating brush with abrasive slurry (so-called pumice generally obtained from valcanic ashes, or alumina or the like.
  • the abrasive slurry has a certain hardness, that is, the hardness of which is not less than 6 in new Mohs scale.
  • the minimum-side-to-maximum-side ratio of grain of the abrasive slurry is less than 0.4 and the grain sharpest angle of which is less than 45°.
  • the abrasive inserts the support and brought thereby causes a trouble in the next step because the abrasive is so hard, or often so sharp.
  • the valley portion is considerably deep in comparison with any other method, so that the mountain portions form very sharply projecting burrs. Therefore, sometimes, the printing performance is lowered particularly in "stains”, and it costs much to exchange the brush exhausted by abrasion, and to dispose the exhausted abrasive, and so on.
  • abrasive particles include, in particular, pumice (Mohs hardness 5) and aluminum (Mohs hardness 2-2,9) as disclosed in US-A-3 891 516 crystalline alumina (Mohs hardness 9) as disclosed in FR-A-2 418 059, pumice, iron powder (Mohs hardness 4 - 5) and dolomite (Mohs hardness 3,5-4) as disclosed in EP-A-0 213 371 and dolomite (Mohs hardness 3,5-4) as disclosed in EP-A-0 704 320; prior art according to Art. 54(3) EPC.
  • the present invention has been made to solve the foregoing problems in the brush graining, and therefore an object of the present invention was to provide a method for treating the surface of an aluminum plate for a printing plate, in which a support having a good printing performance without any "stains” and which improved "narrowing of shadowed portions" can be manufactured at a low cost and stably.
  • the present invention has been achieved by the provision of a method for treating the surface of an aluminum support for a printing plate through the brush-graining surface treatment technique in which a slurry of aluminum hydroxide is rubbed against the support by means of an abrasive brush to perform graining on a surface of the support, wherein the average grain size of said abrasive is equal to or greater than 5 ⁇ m but less than 200 ⁇ m, and the grain concentration of said abrasive slurry is equal to or greater than 5 weight percent but less than 90 weight percent.
  • said abrasive has a new Mohs scale hardness which is equal to or greater than 2 but less than 6.
  • said abrasive include grains having a minimum-side-to-maximum-side ratio of not less than 0.4, and having the sharpest angle equal to or greater than 45°.
  • Figure is a schematic side view showing a process for treating the surface of an aluminum support for a printing plate according to the present invention.
  • Figure is a schematic side view showing a process for the surface of an aluminum support for a printing plate according to the present invention.
  • an aluminum support 1 is supported by pass rollers 2 so as to be subjected to surface treatment mechanically with abrasive brushes 3 and abrasive slurry 4.
  • the abrasive slurry 4 is applied to the surface of the aluminum support 1 by a circulating pump 6 through a pipe 20, rubbed by the abrasive brushes 3 against the aluminum support 1, and then returned from a receiver 22 to a circulating tank 5 through an abrasive slurry return pipe 7.
  • the grain size of the abrasive slurry becomes smaller so that the surface treatment becomes difficult if the slurry once used for surface treatment is used again as it is.
  • abrasive and water are supplied to the circulating tank 5 through pipes 12 and 13, respectively. Consequently, a part of the abrasive slurry flows to an overflow tank 5a.
  • the overflowed abrasive is classified by a cyclone 8 so that large-grain abrasive is returned to the circulating tank 5 while the remainder small-grain abrasive is discharged to the outside of the system through an abrasive slurry discharge pipe 10.
  • the discharged abrasive is solid/liquid separated by a centrifuge separator 11, and used small-grain-size abrasive 14 is extracted as grains so as to be treated.
  • the hardness of abrasive used as brush graining is lower than any conventional one.
  • 10 kinds of minerals are selected in accordance with the hardness used as Mohs scale in the field of minerals, and a surface is scraped with the thus selected minerals one by one sequentially so that if there is a damage, it is determined that the surface is softer than the mineral.
  • the hardness of the abrasive has been selected to be not less than 5 in Mohs scale conventionally, it is selected to be equal to or greater than 2 but less than 6 in new Mohs scale according to the present invention.
  • the new Mohs scale is defined by adding 5 kinds so that the old scale between 1 and 10 are widened to between 1 and 15. In the sections 1-15 of the new Mohs scale, 1-6 are the same as those in the old Mohs scale.
  • the hardness equal to or greater than 2 but less than 6 means the hardness corresponding to No. 2 gypsum, No. 3 calcite, No. 4 fluorite and No. 5 apatite, respectively.
  • the minimum-side-to-maximum-side ratio (as three-dimensional size ratio) of the grain should preferably be 0.4 or more, which has been regarded as good conventionally, and the sharpest angle of grains to be used should be 45° or more.
  • the grain inserts the surface of the aluminum support so that the grain is brought into the next step causing a trouble as a result.
  • the minimum-side-to-maximum-side ratio of the grain is equal to or greater than 0.4, preferably not less than 0.5 but not more than 1, and the sharpest angle of the grain should be equal to or greater than 45°, preferably not less than 60° but not more than 120°.
  • Aluminum hydroxide has been found as the abrasive having the above-mentioned characteristics.
  • the average size of grains of the abrasive is equal to or greater than 5 ⁇ m but less than 200 ⁇ m. Furthermore, it is essential that the concentration of the abrasive slurry is equal to or greater than 5 weight percent but less than 90 weight percent. If the average size of grains of the abrasive is equal to or greater than 5 ⁇ m but less than 200 ⁇ m, graining with desired surface roughness can be attained. If the average size of grains of the abrasive is less than 5 ⁇ m, the roughness is insufficient, and if it is not less than 200 ⁇ m, the surface becomes too rough. The more preferable range of the average size of grains of the abrasive is from 8 ⁇ m to 100 ⁇ m.
  • the concentration of the abrasive slurry is less than 5 weight per cent, the surface roughness becomes insufficient so that the surface is apt to be damaged by the brush, while if it is not less than 90 weight per cent, it becomes difficult to handle the slurry.
  • the more preferable range of the concentration is from 10 weight per cent to 60 weight per cent.
  • Aluminum hydroxide (new Mohs scale 3), pumice (new Mohs scale 5) and alumina (new Mohs scale 12) having properly selected three-dimensional size and the selected sharpest angle of grains were used as abrasive in the surface treatment process shown in Figure, and the surfaces of aluminum supports for printing plates were treated with the respective abrasive.
  • Table 1 shows the relationship between the grain shapes and the printing performances at that time.
  • This surface treatment was performed under the conditions as follows:
  • Aluminum hydroxide was used in Examples 1 and 2, and satisfied the conditions that the abrasive has a new Mohs scale which is equal to or greater than 2 but less than 6, and that aluminum hydroxide is used for the abrasive.
  • the defects in the brush graining method were improved by the surface treatment method of the present invention, and the printing quality against "narrowing of shadowed portions" and "stains” was improved. Accordingly, the performance of printing could be improved conspicuously.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Claims (3)

  1. Procédé de traitement de la surface d'un support en aluminium pour une plaque d'impression, comprenant les étapes suivantes :
    préparation d'un abrasif constitué d'hydroxyde d'aluminium; et frottement d'une suspension épaisse dudit abrasif contre ledit support en aluminium au moyen d'une brosse abrasive afin d'effectuer un grenage à la surface dudit support en aluminium;
    dans lequel la taille moyenne des grains dudit abrasif est égale ou supérieure à 5 µm mais inférieure à 200 µm et la concentration en grains de ladite suspension épaisse d'abrasif est égale ou supérieure à 5 pour cent en poids mais inférieure à 90 pour cent en poids.
  2. Procédé selon la revendication 1, dans lequel ledit abrasif est obtenu à partir de grains ayant un rapport taille minimale sur taille maximale non inférieur à 0,4 et dont l'angle le plus aigu est supérieur ou égal à 45°.
  3. Procédé selon la revendication 1 ou 2, dans lequel l'hydroxyde d'aluminium abrasif possède une dureté sur la nouvelle échelle de Mohs égale ou supérieure à 2 mais inférieure à 6.
EP19960105119 1995-03-30 1996-03-29 Procédé pour le traitement de surfaces en aluminium pour plaques d'impression Expired - Lifetime EP0734883B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP7357895 1995-03-30
JP7357895 1995-03-30
JP73578/95 1995-03-30
JP335148/95 1995-12-22
JP33514895A JP3491245B2 (ja) 1995-03-30 1995-12-22 印刷版用アルミニウム支持体の表面処理方法
JP33514895 1995-12-22

Publications (2)

Publication Number Publication Date
EP0734883A1 EP0734883A1 (fr) 1996-10-02
EP0734883B1 true EP0734883B1 (fr) 1999-11-03

Family

ID=26414721

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960105119 Expired - Lifetime EP0734883B1 (fr) 1995-03-30 1996-03-29 Procédé pour le traitement de surfaces en aluminium pour plaques d'impression

Country Status (3)

Country Link
EP (1) EP0734883B1 (fr)
JP (1) JP3491245B2 (fr)
DE (1) DE69604956T2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1159009A (ja) * 1997-08-22 1999-03-02 Fuji Photo Film Co Ltd 印刷版用アルミニウム支持体の表面処理方法
JP2000062341A (ja) * 1998-08-13 2000-02-29 Fuji Photo Film Co Ltd 印刷版用アルミニウム板の表面処理方法および装置
CN108927735B (zh) * 2017-05-23 2023-08-15 天津滨海光热反射技术有限公司 一种节能型抛光装置及抛光粉溶液循环使用方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3891516A (en) * 1970-08-03 1975-06-24 Polychrome Corp Process of electrolyically anodizing a mechanically grained aluminum base and article made thereby
US4183788A (en) * 1978-02-28 1980-01-15 Howard A. Fromson Process for graining an aluminum base lithographic plate and article thereof
JPS6227192A (ja) * 1985-07-26 1987-02-05 Fuji Photo Film Co Ltd 平版印刷版用支持体の製造方法
DE4435221A1 (de) * 1994-09-30 1996-04-04 Hoechst Ag Verfahren zum mechanischen Aufrauhen der Oberfläche eines Druckplattenträgers und Bürstenwalze zur Durchführung des Verfahrens

Also Published As

Publication number Publication date
JP3491245B2 (ja) 2004-01-26
JPH08324143A (ja) 1996-12-10
DE69604956D1 (de) 1999-12-09
DE69604956T2 (de) 2000-03-30
EP0734883A1 (fr) 1996-10-02

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