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WO1981002547A1 - Method for manufacturing a base material for an offset printing plate,base material produced according to such method and implementation of said method for manufacturing an offset printing plate - Google Patents

Method for manufacturing a base material for an offset printing plate,base material produced according to such method and implementation of said method for manufacturing an offset printing plate Download PDF

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Publication number
WO1981002547A1
WO1981002547A1 PCT/AT1981/000004 AT8100004W WO8102547A1 WO 1981002547 A1 WO1981002547 A1 WO 1981002547A1 AT 8100004 W AT8100004 W AT 8100004W WO 8102547 A1 WO8102547 A1 WO 8102547A1
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WO
WIPO (PCT)
Prior art keywords
base material
offset printing
roughness
printing plate
strip
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.)
Ceased
Application number
PCT/AT1981/000004
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German (de)
French (fr)
Inventor
F Reiterer
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.)
Folienwalzwerk Brueder Teich AG
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Folienwalzwerk Brueder Teich AG
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Publication date
Application filed by Folienwalzwerk Brueder Teich AG filed Critical Folienwalzwerk Brueder Teich AG
Priority to AU67900/81A priority Critical patent/AU6790081A/en
Priority to BR8107432A priority patent/BR8107432A/en
Publication of WO1981002547A1 publication Critical patent/WO1981002547A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/06—Silver salts
    • G03F7/07—Silver salts used for diffusion transfer
    • 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
    • B41N3/03—Chemical or electrical pretreatment
    • B41N3/034—Chemical or electrical pretreatment characterised by the electrochemical treatment of the aluminum support, e.g. anodisation, electro-graining; Sealing of the anodised layer; Treatment of the anodic layer with inorganic compounds; Colouring of the anodic layer
    • 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 invention relates to a process for the production of base material for offset printing plates, in which an aluminum strip, in particular a pure aluminum strip, is provided with a defined surface roughness at least on one surface side and then with an aluminum oxide layer, and the use of such a base material in the production of offset printing plates by the silver salt diffusion process.
  • the latent negative image of the printed image to be produced is first produced on a photo paper by appropriate exposure.
  • the photo paper (negative paper) thus exposed is now passed together with the plate base material through a basic developer-fixing salt solution, so that a thin layer of liquid is retained between the exposed silver salt layer of the photo paper and the offset printing plate surface to be produced.
  • the silver salt dissociated by the exposure is reduced to silver in the photo paper.
  • the unexposed portions of the silver salt are detached from the fixing component of the solution (for example, sodium riothothiosulfate) with formation of a complex and onto the offset printing plates base material, where - due to the different position of aluminum and silver in the voltage series - the silver of the detached silver salt complex is reflected in the form of a positive image on the surface of the offset printing plate base material.
  • the offset printing plate produced in this way is now treated on its printing surface with a weak organic acid and finally dried.
  • the printing plate is first moistened with water, the water not being accepted by the areas of the printing plate surface covered with silver and a water film being formed only in the silver-free surface areas. Then the oily printing ink is applied, which in turn is only accepted by the areas of the printing plate surface covered with silver.
  • This color image is then transferred to the print carrier via an intermediate carrier using the known offset printing principle, e.g. onto the paper to be printed.
  • the defined surface roughness of the offset printing plate has i.a. the purpose of ensuring the so-called water flow of the surface to the required extent, i.e. to cause a water film which is as uniform as possible to form on the silver-free areas when the printing plate surface is moistened.
  • the quality of the offset printing plates produced in this way is determined on the one hand by the quality of the print quality achieved but on the other hand also by the plate service life, that is to say by the number of prints to be made with an offset printing plate.
  • the surface roughness mentioned can be indicated by the mean roughness value R a and the average roughness depth R z , measured in each case parallel and perpendicular to the longitudinal direction of the aluminum strip.
  • the measuring sections for these roughness depth measurements have lengths of 4 mm and are each divided into five evaluation areas of 0.8 mm.
  • the mean roughness value R a is understood to mean the arithmetic mean of the absolute amounts of all distances of the recorded roughness profile from the center line of this roughness profile within the measuring section.
  • the roughness depth is understood to be the distance perpendicular to this center line between the highest and the lowest point of the roughness profile within an evaluation area.
  • the average roughness depth R z is the mean value of the roughness depths determined from these five evaluation areas of a measuring section.
  • the surface roughness is produced, for example, by brushing, after which the surface aluminum oxide slide is formed without any special measures due to the action of atmospheric oxygen.
  • the surface roughness measured perpendicular to the length of the strip, has a mean roughness value R a of 0.47 ⁇ m and an average roughness depth R z of 4.31 pm, and, measured parallel to the length of the strip, has a center roughness value R a of 0, 73 ⁇ m and an average roughness of 3.82 ⁇ m.
  • the service life of the offset printing plates made from such a known base material corresponds to approximately 10,000 proofs with moderate print quality. Presentation of the invention
  • the invention is based on the object of specifying a method for producing a base material for offset printing plates, in which an aluminum strip, in particular a pure aluminum strip, is provided on a surface side with a defined surface roughness and then with an aluminum oxide layer, and wherein the base material produced by the method according to the invention is at its Use according to the invention in the production of offset printing plates by the silver salt diffusion process leads to offset printing plates which ensure high printing quality and relatively long service lives.
  • Roll is produced with a defined surface structure and the oxide layer is then produced by galvanic anodization. This impression of the surface roughness can advantageously be carried out with the aid of a roller when the aluminum strip is rolled out to its final thickness.
  • the anodization process is carried out in such a way that the rollers used for embossing have such a surface structure that the aluminum oxide layer applied by the galvanic anodization has a basis weight of 0.2 to 2.0 g / m 2 in the base material for offset printing plates produced according to the invention , before geous but from 1.0 to 1.5 g / m 2 measured according to DIN 50944 and that the surface roughness of the finished base material roughness values from 0.05 to 1.0 pm and average roughness depths from 0.4 to 10.0 microns having.
  • Offset printing plates produced with such a base material according to the silver salt diffusion process have a service life of approximately 20,000 to 40,000 proofs.
  • the surface roughness on the finished base material - measured perpendicular to the lengthwise strip length - mean roughness values of 0.15 to 0.50 pm and mean roughness depths of 1.0 to 3.0 ⁇ m, and - measured parallel to the lengthwise strip length - mean roughness values of 0 , 05 to 0.30 ⁇ m and average roughness depths of 0.4 to 2.5 pm.
  • the invention further relates to the use of the base material according to the invention in the production of offset printing plates by the silver salt diffusion process.
  • an aluminum roughing strip of Al 99.0 quality in accordance with DIN 1712, a width of 1100 mm and a thickness of 0.6 mm is soft-annealed at 550 ° C. for 8 hours and then in roll stands whose rolls have a rough-ground surface three successive roll passes rolled to 0.1 mm.
  • This aluminum strip is then subjected to DC anodization in a strip anodizing plant with an electrolyte consisting of 20% sulfuric acid with a Strosi density of approximately 2 A / dm 2 .
  • the anodization is carried out in such a way that the weight per unit area of the aluminum oxide layer produced by the direct current anodization according to DIN 50944 is approximately 0.8 g / m 2 , which corresponds to an aluminum oxide layer thickness of approximately 0.25 ⁇ m.
  • the surface roughness of the offset printing plate base material produced in this way then has, for example, measured perpendicular to the belt stretch, a mean roughness value R a of 0.29 ⁇ m and an average roughness depth R z of 2.07 ⁇ m, and, measured parallel to the longitudinal length of the strip, a mean roughness value R a of 0.15 ⁇ m and an average roughness R z of 0.88 ⁇ m.
  • the service life of the offset printing plates made from this base material using the silver salt diffusion process is surprisingly long and corresponds to around 25,000 proofs with very good print quality.
  • the same soft-annealed aluminum roughing strip with a thickness of 0.6 mm is used as described in the first method variant.
  • This roughing strip is then pre-rolled in thicknesses of 0.3 or 0.15 mm in two pass passes on roll stands, the rolls of which have a rough-ground surface, and is then milled in a roll, of which at least one of the two rolls has a surface structure generated by sandblasting onto the Rolled out to a final thickness of 0.1 mm.
  • the subsequent galvanic anodization is then carried out analogously to the first method variant and is carried out in such a way that the weight per unit area of the aluminum oxide layer produced is approximately 1.2 g / m 2 , which corresponds to an aluminum oxide layer thickness of approximately 0.4 ⁇ m.
  • the surface roughness of the base material produced in this way has, for example, measured perpendicular to the lengthwise strip length, a mean roughness value R a of 0.6 ⁇ m and a mean roughness depth R z of 3.4 ⁇ m, and, measured parallel to the lengthwise strip length, a mean roughness value R a of 0. 6 um and an average roughness depth R z of 3.6 ⁇ m.
  • the service life of the offset printing plates made from this basic material corresponds to approximately 30,000 proofs.
  • the process according to the invention for the production of base material which is used for the production of offset printing plates using the silver salt diffusion process, is relatively inexpensive and leads to offset printing plates which are relatively long with good print quality

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)

Abstract

For the production of a base material intended to the manufacture of an onset printing plate according to the method of diffusion of silver salts, at least one upper surface of an aluminum strip is provided with some rugosity by means of a cylinder having an appropriate surface, thereafter an aluminum oxyde layer is deposited by anodization. The rugosity of the upper surface is preferably obtained by means of a cylinder by lamination of the aluminum strip at its final thickness. The base material thus obtained, of which the aluminum oxyde layer has a weight of 0.2 to 2.0 grammes per square meter, but preferably 1.0 to 1.5 grammes per square meter and of which the surface rugosity exhibits mean values from 0.05 to 1.0 microns and mean depressions from 0.4 to 10 microns, gives, after applying the process for the diffusion of silver salts, onset printing plates which provide for a high printing quality and a long resistance life.

Description

Verfahren zur Herstellung von Grundmaterial für Offsetdruckplatten, nach diesem Verfahren hergestelltes Grundmaterial sowie dessen Verwendung bei der Offsetdruckplattenherstellung.Process for the production of base material for offset printing plates, base material produced by this process and its use in the production of offset printing plates.

Technisches GebietTechnical field

Die Erfindung betrifft ein Verfahren zur Herstellung von Grundmaterial für Offsetdruckplatten, bei dem ein Aluminiumband, insbesondere ein Reinaluminiumband zumindest an einer Oberflächenseite mit einer definierten Oberflächenrauhigkeit und danach mit einer Aluminiumoxidschicht versehen wird, sowie die Verwendung eines solchen Grundmaterials bei der Offsetdruckplattenherstellung nach dem Silbersalzdiffusionsverfahren.The invention relates to a process for the production of base material for offset printing plates, in which an aluminum strip, in particular a pure aluminum strip, is provided with a defined surface roughness at least on one surface side and then with an aluminum oxide layer, and the use of such a base material in the production of offset printing plates by the silver salt diffusion process.

Bei dem genannten Silbersalzdiffusionsverfahren zur Herstellung von Offsetdruckplatten wird zunächst auf einem Photopapier durch entsprechende Belichtung das latente Negativbild des herzustellenden Druckbildes erzeugt. Das so belichtete Photopapier (Negativpapier) wird nun gemeinsam mit dem Platten-Grundmaterial durch eine basische Entwickler-FixierSalzlösung geführt, derart daß zwischen der belichteten Silbersalzschicht des Photopapiers und der herzustellenden Offsetdruckplattenoberfläche eine dünne Flüssigkeitsschicht erhalten bleibt. Dabei wird das durch die Belichtung dissozierte Silbersalz im Photopapier zu Silber reduziert. Gleichzeitig werden die unbelichteten Anteile des Silbersalzes von der Fixierkomponente der Lösung (z.B.Natriurothiosulfat) unter Komplexbildung abgelöst und auf das Offsetdruckplatten grundmaterial übertragen, wo sich - infolge der unterschiedlichen Stellung von Aluminium und Silber in der Spannungsreihe - das Silber des abgelösten Silbersalzkomplexes in Form eines Positivbildes an der Oberfläche des Offsetdruckplatten-Grundmaterials niederschlägt. Die auf diese Weise hergestellte Offsetdruckplatte wird nun an ihrer Druckoberfläche mit einer schwachen organischen Säure behandelt und schließlich getrocknet.In the aforementioned silver salt diffusion process for the production of offset printing plates, the latent negative image of the printed image to be produced is first produced on a photo paper by appropriate exposure. The photo paper (negative paper) thus exposed is now passed together with the plate base material through a basic developer-fixing salt solution, so that a thin layer of liquid is retained between the exposed silver salt layer of the photo paper and the offset printing plate surface to be produced. The silver salt dissociated by the exposure is reduced to silver in the photo paper. At the same time, the unexposed portions of the silver salt are detached from the fixing component of the solution (for example, sodium riothothiosulfate) with formation of a complex and onto the offset printing plates base material, where - due to the different position of aluminum and silver in the voltage series - the silver of the detached silver salt complex is reflected in the form of a positive image on the surface of the offset printing plate base material. The offset printing plate produced in this way is now treated on its printing surface with a weak organic acid and finally dried.

Für die Durchführung des Offsetdruckes wird die Druckplatte Jeweils zunächst mit Wasser befeuchtet, wobei das Wasser von den mit Silber bedeckten Bereichen der Druckplattenoberfläche nicht angenommen wird und nur in den silberfreien Oberflächenbereichen ein Wasserfilm entsteht. Danach wird die ölige Druckfarbe aufgetragen, welche ihrerseits nur von den mit Silber bedeckten Bereichen der Druckplattenoberfläche angenommen wird. Dieses Farbbild wird dann nach dem bekannten Offsetdruckprinzip über einen Zwischenträger auf den Druckträger, also z.B. auf das zu bedruckende Papier übertragen.To carry out the offset printing, the printing plate is first moistened with water, the water not being accepted by the areas of the printing plate surface covered with silver and a water film being formed only in the silver-free surface areas. Then the oily printing ink is applied, which in turn is only accepted by the areas of the printing plate surface covered with silver. This color image is then transferred to the print carrier via an intermediate carrier using the known offset printing principle, e.g. onto the paper to be printed.

Die definierte Oberflächenrauhigkeit der Offsetdruckplatte hat u.a. den Zweck, die sogenannte Wasserführung der Oberfläche in dem erforderlichen Ausmaß sicherzustellen, d.h. zu bewirken, daß bei der Befeuchtung der Druckplattenoberfläche sich an den silberfreien Stellen ein möglichstgleichmäßiger Wasserfilm bildet.The defined surface roughness of the offset printing plate has i.a. the purpose of ensuring the so-called water flow of the surface to the required extent, i.e. to cause a water film which is as uniform as possible to form on the silver-free areas when the printing plate surface is moistened.

Die Qualität der auf diese Weise hergestellten Offsetdruckplatten ist einerseits durch die Güte der erzielten Druckqualität aber andererseits auch durch die Plattenstandzeiten, d.h. also durch die Anzahl der mit einer Offsetdruckplatte anzufertigenden Drucke bestimmt. Die genannte Oberflächenrauhigkeit kann durch den Mittenrauhwert Ra und die mittlere Rauhtiefe Rz, jeweils parallel und senkrecht zur Aluminiumbandlängserstreckung gemessen, angegeben werden. Die Meßstrecken bei diesen Rauhtiefenmessungen haben dabei Längen von 4 mm und sind jeweils in fünf Auswertebereiche von 0,8 mm unterteilt.The quality of the offset printing plates produced in this way is determined on the one hand by the quality of the print quality achieved but on the other hand also by the plate service life, that is to say by the number of prints to be made with an offset printing plate. The surface roughness mentioned can be indicated by the mean roughness value R a and the average roughness depth R z , measured in each case parallel and perpendicular to the longitudinal direction of the aluminum strip. The measuring sections for these roughness depth measurements have lengths of 4 mm and are each divided into five evaluation areas of 0.8 mm.

Als Mittenrauhwert Ra versteht man dabei den arithmetrischan Mittelwert der absoluten Beträge aller Abstände des aufgenommenen Rauheitsprofils von der Mittellinie dieses Rauheitsprofils innerhalb der Meßstrecke. Als Rauhtiefe wird der zu dieser Mittellinie senkrechte Abstand zwischen dem höchsten und dem tiefsten Punkt des Rauheitsprofils innerhalb eines Auswertebereiches verstanden. Die mittlere Rauhtiefe Rz ist der Mittelwert der aus diesen fünf Auswertebereichen einer Meßstrecke bestimmten Raithtiefen.The mean roughness value R a is understood to mean the arithmetic mean of the absolute amounts of all distances of the recorded roughness profile from the center line of this roughness profile within the measuring section. The roughness depth is understood to be the distance perpendicular to this center line between the highest and the lowest point of the roughness profile within an evaluation area. The average roughness depth R z is the mean value of the roughness depths determined from these five evaluation areas of a measuring section.

Stand der TechnikState of the art

Bei einem als Standardqualität bekannten Grundmaterial für nach dem Silbersalzdiffusionsverfahren herzustellenden Offsetdruckplatten wird z.B. die Oberflächenrauhigkeit durch Bürsten hergestellt, wonach sich die oberflächige Aluminiumoxidschiebt ohne besondere Maßnahmen durch Einwirkung des Luftsauerstoffes bildet. Bei diesem bekannten Standardmaterial weist z.B. die Oberflächenrauhigkeit, senkrecht, zur Bandlangerstreckung gemessen, einen Mittenrauhwert Ra von 0,47 um und eine mittlere Rauhtiefe Rz von 4,31 pm, sowie, parallel zur Bandlangerstreckung gemessen, einen Mittenrauhwert Ra von 0,73 um und eine mittlere Rauhtiefe von 3,82 um auf. Die Standzeit der aus einem solchen bekannten Grundmaterial hergestellten Offsetdruckplatten entspricht bei mäßiger Druckqualität etwa 10.000 Andrucken. Darstellung der ErfindungIn the case of a base material known as standard quality for offset printing plates to be produced by the silver salt diffusion process, the surface roughness is produced, for example, by brushing, after which the surface aluminum oxide slide is formed without any special measures due to the action of atmospheric oxygen. In this known standard material, for example, the surface roughness, measured perpendicular to the length of the strip, has a mean roughness value R a of 0.47 μm and an average roughness depth R z of 4.31 pm, and, measured parallel to the length of the strip, has a center roughness value R a of 0, 73 µm and an average roughness of 3.82 µm. The service life of the offset printing plates made from such a known base material corresponds to approximately 10,000 proofs with moderate print quality. Presentation of the invention

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung eines Grundmaterials für Offsetdruckplatten anzugeben, bei dem ein Aluminiumband, insbesondere ein Reinaluminiumband an einer Oberflächenseite mit einer definierten Oberflächenrauhigkeit und danach mit einer Aluminiumoxidschicht versehen wird und wobei das nach dem erfindungsgemäßen Verfahren hergestellte Grundmaterial bei seiner erfindungsgemäßen Verwendung bei der Offsetdruckplattenherstellung nach dem Silbersalzdiffusionsverfahren zu Offsetdruckplatten führt, die eine hohe Druck qualität sowie relativ lange Standzeiten gewährleisten.The invention is based on the object of specifying a method for producing a base material for offset printing plates, in which an aluminum strip, in particular a pure aluminum strip, is provided on a surface side with a defined surface roughness and then with an aluminum oxide layer, and wherein the base material produced by the method according to the invention is at its Use according to the invention in the production of offset printing plates by the silver salt diffusion process leads to offset printing plates which ensure high printing quality and relatively long service lives.

Diese Aufgabe wird in dem erfindungsgemäßen Verfahren gelost, das dadurch gekennzeichnet ist, daß die definierte Oberflächenrauhigkeit durch Einprägen mit Hilfe einerThis object is achieved in the method according to the invention, which is characterized in that the defined surface roughness by stamping with the aid of a

Walze mit definierter Oberflächenstruktur hergestellt wird und die Herstellung der Oxidschicht danach durch galvanische Anodisierung erfolgt. Dabei kann dieses Einprägen der Oberflächenrauhigkeit mit Hilfe einer Walze vorteilhaft beim Auswalzen des Aluminiumbandes auf seine Endstärke erfolgen.Roll is produced with a defined surface structure and the oxide layer is then produced by galvanic anodization. This impression of the surface roughness can advantageously be carried out with the aid of a roller when the aluminum strip is rolled out to its final thickness.

Der Anodisierungsprozeß wird dabei so geführt bzw. die zum Einprägen dienenden Walzen weisen eine solche Oberflächenstruktur auf, daß bei dem dabei hergestellten erfindungsgemäßen Grundmaterial für Offsetdruckplatten die durch die galvanische Anodisierung aufgebrachte Aluminium oxidschicht ein Flächengewicht von 0, 2 bis 2, 0 g/m2 , vor teilhaft aber von 1,0 bis 1,5 g/m2 gemessen nach DIN 50944 aufweist und daß die Oberflächenrauhigkeit des fertigen Grundmaterials Mittenrauhwerte von 0,05 bis 1,0 pm und mittlere Rauhtiefen von 0,4 bis 10,0 um aufweist. Mit einem solchen Grundmaterial nach dem Silbersalzdiffusionsverfahren hergestellte Offsetdruckplatten weisen Standzeiten von etwa 20.000 bis 40.000 Andrucken auf. Gemäß einer vorteilhaften Ausgestaltung der Erfindung beträgt die Oberflächenrauhigkeit am fertigen Grundmaterial - senkrecht zur Bandlängserstreckung gemessen Mittenrauhwerte von 0,15 bis 0,50 pm und mittlere Rauhtiefen von 1,0 bis 3,0 um, sowie - parallel zur Bandlängserstreckung gemessen - Mittenrauhwerte von 0,05 bis 0,30 um und mittlere Rauhtiefen von 0,4 bis 2,5 pm.The anodization process is carried out in such a way that the rollers used for embossing have such a surface structure that the aluminum oxide layer applied by the galvanic anodization has a basis weight of 0.2 to 2.0 g / m 2 in the base material for offset printing plates produced according to the invention , before geous but from 1.0 to 1.5 g / m 2 measured according to DIN 50944 and that the surface roughness of the finished base material roughness values from 0.05 to 1.0 pm and average roughness depths from 0.4 to 10.0 microns having. Offset printing plates produced with such a base material according to the silver salt diffusion process have a service life of approximately 20,000 to 40,000 proofs. According to an advantageous embodiment of the invention, the surface roughness on the finished base material - measured perpendicular to the lengthwise strip length - mean roughness values of 0.15 to 0.50 pm and mean roughness depths of 1.0 to 3.0 µm, and - measured parallel to the lengthwise strip length - mean roughness values of 0 , 05 to 0.30 µm and average roughness depths of 0.4 to 2.5 pm.

Die Erfindung betrifft ferner die Verwendung des erfindungsgemäßen Grundmaterials bei der Herstellung von Offsetdruckplatten nach dem Silbersalzdiffusionsverfahren.The invention further relates to the use of the base material according to the invention in the production of offset printing plates by the silver salt diffusion process.

Bester Weg zur Ausführung der Erfindung.Best way to carry out the invention.

Bei einer ersten bevorzugten VerfahrensVariante wird ein Aluminiumvorwalzband der Qualität Al 99,0 nach DIN 1712, einer Breite von 1100 mm und einer Stärke von 0,6 mm wird während 8 Stunden bei 550ºC weichgeglüht und danach in Walzgerüsten, deren Walzen eine Rauhschliffoberfläche aufweisen, in drei aufeinanderfolgenden Walzstichen auf 0,1 mm ausgewalzt. Dieses Aluminiumband wird danach in einer Bandanodisieranlage mit einem Elektrolyt bestehend aus 20%iger Schwefelsäure mit einer Strosidichte von etwa 2 A/dm2 einer Gleichstromanodisierung unterworfen.In a first preferred process variant, an aluminum roughing strip of Al 99.0 quality in accordance with DIN 1712, a width of 1100 mm and a thickness of 0.6 mm is soft-annealed at 550 ° C. for 8 hours and then in roll stands whose rolls have a rough-ground surface three successive roll passes rolled to 0.1 mm. This aluminum strip is then subjected to DC anodization in a strip anodizing plant with an electrolyte consisting of 20% sulfuric acid with a Strosi density of approximately 2 A / dm 2 .

Die Anodisierung wird dabei so geführt, daß das gemäß DIN 50944 gemessene Flächengewicht der durch die Gleichstrom-Anodisierung hergestellten Aluminiumoxidschicht etwa 0,8 g/m2 beträgt, was einer Aluminiumoxidschichtdicke von etwa 0,25 pm entspricht. Die Oberflächenrauhigkeit des so erzeugten Offsetdruckplatten-Grundmaterials weist dann z.B., senkrecht zur Banderstreckung gemessen, einen Mittenrauhwert Ra von 0,29 um und eine mittlere Rauhtiefe Rz von 2,07 um, sowie, parallel zur Bandlängserstreckung gemessen, einen Mittelrauhwert Ra von 0,15 um und eine mittlere Rauhtiefe Rz von 0,88 um auf.The anodization is carried out in such a way that the weight per unit area of the aluminum oxide layer produced by the direct current anodization according to DIN 50944 is approximately 0.8 g / m 2 , which corresponds to an aluminum oxide layer thickness of approximately 0.25 μm. The surface roughness of the offset printing plate base material produced in this way then has, for example, measured perpendicular to the belt stretch, a mean roughness value R a of 0.29 μm and an average roughness depth R z of 2.07 μm, and, measured parallel to the longitudinal length of the strip, a mean roughness value R a of 0.15 µm and an average roughness R z of 0.88 µm.

Die Standzeit der aus diesem Grundmaterial nach dem Silbersalzdiffusionsverfahren hergestellten Offsetdruckplatten ist überraschend hoch und entspricht bei sehr guter Druckqualität etwa 25.000 Andrucken.The service life of the offset printing plates made from this base material using the silver salt diffusion process is surprisingly long and corresponds to around 25,000 proofs with very good print quality.

Bei einer anderen bevorzugten Verfahrensvariante wird von dem gleichen weichgeglühten Aluminiuπrvorwalzband einer Stärke von 0,6 mm ausgegangen, wie bei der ersten Verfährensvariante beschrieben. Dieses Vorwalzband wird dann in zwei Walzstichen an Walzgerüsten, deren Walzen eineRauhschliffoberfläche aufweisen, auf Stärken von 0,3 bzw. 0,15 mm vorgewalzt und danach in einem Walz gerüst, von dem mindestens eine der beiden Walzen eine durch Sandstrahlung erzeugte Oberflächenstruktur aufweist auf die Endstärke von 0,1 mm ausgewalzt. Die darauffolgende galvanische Anodisierung erfolgt dann analog wie bei der ersten Verfahrensvariante und ist so geführt, daß das Flächengewicht der dabei erzeugten Aluminiumoxidschicht etwa 1,2 g/m2 beträgt, was einer Aluminiumoxidschichtdicke von etwa 0,4 pm entspricht.In another preferred method variant, the same soft-annealed aluminum roughing strip with a thickness of 0.6 mm is used as described in the first method variant. This roughing strip is then pre-rolled in thicknesses of 0.3 or 0.15 mm in two pass passes on roll stands, the rolls of which have a rough-ground surface, and is then milled in a roll, of which at least one of the two rolls has a surface structure generated by sandblasting onto the Rolled out to a final thickness of 0.1 mm. The subsequent galvanic anodization is then carried out analogously to the first method variant and is carried out in such a way that the weight per unit area of the aluminum oxide layer produced is approximately 1.2 g / m 2 , which corresponds to an aluminum oxide layer thickness of approximately 0.4 μm.

Die Oberflächenrauhigkeit des so erzeugten Grundmaterials weist z.B., senkrecht zur Bandlängserstreckung gemessen, einen Mittenrauhwert Ra von 0,6 um und eine mittlere Rauh tiefe Rz von 3,4 um, sowie, parallel zur Bandlängserstreckung gemessen, einen Mittenrauhwert Ra von 0,6 um und eine mittlere Rauhtiefe Rz von 3,6 um auf.The surface roughness of the base material produced in this way has, for example, measured perpendicular to the lengthwise strip length, a mean roughness value R a of 0.6 μm and a mean roughness depth R z of 3.4 μm, and, measured parallel to the lengthwise strip length, a mean roughness value R a of 0. 6 um and an average roughness depth R z of 3.6 µm.

Die Standzeit der aus diesem Grundmaterial hergestellten Offsetdruckplatten entspricht etwa 30.000 Andrucken.The service life of the offset printing plates made from this basic material corresponds to approximately 30,000 proofs.

Gewerbliche VerwertbarkeitCommercial usability

Das erfindungsgemäße Verfahren zur Herstellung von Grundmaterial, welches zur Offsetdruckplattenherstellung nach dem Silbersalzdiffusionsverfahren dient, ist verhältnismäßig wenig aufwendig und führt zu Offsetdruckplatten, die bei guter Druckqualität relativ langeThe process according to the invention for the production of base material, which is used for the production of offset printing plates using the silver salt diffusion process, is relatively inexpensive and leads to offset printing plates which are relatively long with good print quality

Standzeiten haben, was zu einer Verringerung der Druckkosten führt. Have downtimes, which leads to a reduction in printing costs.

Claims

PATENTANSPRÜCHE PATENT CLAIMS 1. Verfahren zur Herstellung von Grundmaterial für Offset druckplatten, bei dem ein Aluminiumband, insbesondere ein Reinaluminiumband zumindest an einer Oberflächenseite mit einer definierten Oberflächenrauhigkeit und danach mit einer Aluminiumoxidschiebt versehen wird, dadurch gekennzeichnet, daß die definierte Oberflächen rauhigkeit mit Hilfe einer Walze mit definierter Oberflächenstruktur hergestellt wird und die Herstellung der Oxidschicht danach durch galvanische Anodisierung erfolgt.1. A method for producing base material for offset printing plates, in which an aluminum strip, in particular a pure aluminum strip is provided at least on one surface side with a defined surface roughness and then with an aluminum oxide slide, characterized in that the defined surface roughness using a roller with a defined surface structure is produced and the oxide layer is then produced by galvanic anodization. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Einprägen der Oberflächenrauhigkeit mit Hilfe einer Walze beim Auswalzen des Aluminiumbandes auf seine Endstärke erfolgt.2. The method according to claim 1, characterized in that the surface roughness is impressed with the aid of a roller when rolling out the aluminum strip to its final thickness. 3. Grundmaterial für Offsetdruckplatten, dadurch gekennzeichnet, daß es nach einem Verfahren gemäß Anspruch 1 oder 2 hergestellt ist.3. base material for offset printing plates, characterized in that it is produced by a method according to claim 1 or 2. 4. Grundmaterial nach Anspruch 3, dadurch gekennzeichnet, daß die durch die galvanische Anodisierung aufge brachte Aluminiumoxidschiebt ein Flächengewicht von 0,2 bis 2,0 g/m2 gemessen nach DIN 50944 aufweist und daß die Oberflächenrauhigkeit des fertigen Grundmaterials Mittenrauhwerte von 0,05 bis 1,0 um und mittlere Rauhtiefen von 0,4 bis 10,0 um aufweist.4. Base material according to claim 3, characterized in that the brought up by the galvanic anodization aluminum oxide slides has a weight per unit area of 0.2 to 2.0 g / m 2 measured in accordance with DIN 50944 and that the surface roughness of the finished base material has an average roughness value of 0.05 to 1.0 µm and average roughness depths of 0.4 to 10.0 µm. 5. Grundmaterial nach Anspruch 4, dadurch gekennzeichnet, daß das aufgebrachte Flächengewicht der Aluminiumoxid Schicht von 1,0 bis 1,5 g/m2 beträgt. 5. Base material according to claim 4, characterized in that the applied weight per unit area of the aluminum oxide layer is from 1.0 to 1.5 g / m 2 . 6. Grundmaterial nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß die Oberflächenrauhigkeit senkrecht zur Bandlängerstreckung gemessen - Mittenrauhwerte von 0,15 bis 0,50 pm und mittlere Rauh tiefen von 1,0 bis 3,0 um, sowie - parallel zur Bandlängserstreckung gemessen - Mittenrauhwerte von 0,05 bis 0,30 pm und mittlere Rauhtiefen von 0,4 bis 2,5 um aufweist.6. Base material according to one of claims 3 to 5, characterized in that the surface roughness measured perpendicular to the strip length extension - mean roughness values from 0.15 to 0.50 pm and mean roughness depths from 1.0 to 3.0 µm, and - parallel to Longitudinal strip measurement measured - has average roughness values of 0.05 to 0.30 pm and average roughness depths of 0.4 to 2.5 µm. 7. Verwendung des Grundmaterials für Offsetdruckplatten nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, daß es als Grundmaterial bei der Herstellung einer Offsetdruckplatte nach dem Silberzalzdiffusions verfahren verwendet wird. 7. Use of the base material for offset printing plates according to one of claims 3 to 6, characterized in that it is used as the base material in the manufacture of an offset printing plate according to the silver salt diffusion process.
PCT/AT1981/000004 1980-03-11 1981-03-11 Method for manufacturing a base material for an offset printing plate,base material produced according to such method and implementation of said method for manufacturing an offset printing plate Ceased WO1981002547A1 (en)

Priority Applications (2)

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AU67900/81A AU6790081A (en) 1980-03-11 1981-03-11 Method for manufacturing a base material for an offset printing plate, base material produced according to such method and implentation of said method for manufacturing an offset printing plate
BR8107432A BR8107432A (en) 1980-03-11 1981-03-11 PROCESS FOR THE PREPARATION OF BASE MATERIAL FOR OFFSET PRINTING BOARDS, BASE MATERIAL PREPARED ACCORDING TO THIS PROCESS AS WELL AS YOUR USE IN THE PREPARATION OF OFFSET PRINTING BOARDS

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AT0133280A AT375880B (en) 1980-03-11 1980-03-11 METHOD FOR PRODUCING BASE MATERIAL FOR OFFSET PRINTING PLATES
AT1332/80 1980-03-11

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US4655136A (en) * 1983-02-14 1987-04-07 Hoechst Aktiengesellschaft Sheet material of mechanically and electrochemically roughened aluminum, as a support for offset-printing plates
EP0470529A1 (en) * 1990-08-07 1992-02-12 Fuji Photo Film Co., Ltd. Substrate for lithographic printing plate
GB2281128A (en) * 1993-08-13 1995-02-22 Mitsubishi Paper Mills Ltd Lithographic printing plate material
EP0640877A1 (en) * 1993-08-05 1995-03-01 Agfa-Gevaert N.V. Imaging element and method for making aluminum lithographic printing plates according to the silver salt diffusion transfer process
US5427889A (en) * 1993-08-13 1995-06-27 Mitsubishi Paper Mills Ltd. Lithographic printing plate with pitted aluminum support
WO1995018019A1 (en) * 1993-12-27 1995-07-06 Hoechst Aktiengesellschaft Thermal process for applying hydrophilic layers on hydrophobic substrates and use of thus coated substrates as carriers for offset printing plates
EP0835764A1 (en) * 1996-10-11 1998-04-15 Fuji Photo Film Co., Ltd. Lithographic printing plate, method for producing lithographic printing plate, and method for producing support for lithographic printing plate

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GB678097A (en) * 1949-10-14 1952-08-27 Addressograph Multigraph Improvements in or relating to a planographic printing plate and method of preparingthe same
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NL7211510A (en) * 1971-08-23 1973-02-27
DE2248743A1 (en) * 1971-10-07 1973-04-19 Fuji Photo Film Co Ltd LIGHT SENSITIVE PRINTING PLATE AND METHOD OF MANUFACTURING IT
DE2324506A1 (en) * 1972-05-15 1973-11-29 Fuji Photo Film Co Ltd Planographic aluminium printing plate - contg polyester coated anodised layer
FR2187937A1 (en) * 1972-06-03 1974-01-18 Fuji Photo Film Co Ltd
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US3963594A (en) * 1975-06-03 1976-06-15 Aluminum Company Of America Electrochemical treatment of aluminum surfaces with an aqueous solution of hydrochloric acid and gluconic acid
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NL7807567A (en) * 1977-07-25 1979-01-29 Teich Ag Folienwalzwerk PROCEDURE FOR MANUFACTURE OF BASIC MATERIAL FOR OFFSET PRINT PLATES.
GB2019022A (en) * 1978-03-27 1979-10-24 Nippon Light Metal Co Grained aluminium support for a lithographic printing plate
DE2852002A1 (en) * 1978-05-31 1980-06-12 British Aluminium Co Ltd METHOD FOR PRODUCING LITHOGRAPHIC PLATES

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Publication number Priority date Publication date Assignee Title
GB454283A (en) * 1935-05-21 1936-09-28 William Burton Wescott Improvements in or relating to aluminium planographic printing plates
GB678097A (en) * 1949-10-14 1952-08-27 Addressograph Multigraph Improvements in or relating to a planographic printing plate and method of preparingthe same
NL6709096A (en) * 1966-07-01 1968-01-02
GB1224226A (en) * 1967-10-17 1971-03-03 Ano Coil Ltd Method of, and apparatus for, electrolytically roughening and oxidizing foils or strips of aluminium
FR2237438A5 (en) * 1971-07-09 1975-02-07 Alcan Res & Dev
NL7211510A (en) * 1971-08-23 1973-02-27
DE2248743A1 (en) * 1971-10-07 1973-04-19 Fuji Photo Film Co Ltd LIGHT SENSITIVE PRINTING PLATE AND METHOD OF MANUFACTURING IT
DE2324506A1 (en) * 1972-05-15 1973-11-29 Fuji Photo Film Co Ltd Planographic aluminium printing plate - contg polyester coated anodised layer
FR2187937A1 (en) * 1972-06-03 1974-01-18 Fuji Photo Film Co Ltd
DE2507386A1 (en) * 1974-02-22 1976-01-22 Fuji Photo Film Co Ltd METHOD OF MANUFACTURING A SUPPORT FOR PRINTING PLATES
US3963594A (en) * 1975-06-03 1976-06-15 Aluminum Company Of America Electrochemical treatment of aluminum surfaces with an aqueous solution of hydrochloric acid and gluconic acid
NL7612351A (en) * 1975-11-06 1977-05-10 Nippon Light Metal Res Labor PROCEDURE FOR ELECTROCHEMIC ETCHING OF AN ALUMINUM SUBSTRATE FOR LITHOGRAPHIC PRINTING AND PRINTING PLATE MANUFACTURED ACCORDING TO THE PROCESS.
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DE2852002A1 (en) * 1978-05-31 1980-06-12 British Aluminium Co Ltd METHOD FOR PRODUCING LITHOGRAPHIC PLATES

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4655136A (en) * 1983-02-14 1987-04-07 Hoechst Aktiengesellschaft Sheet material of mechanically and electrochemically roughened aluminum, as a support for offset-printing plates
EP0470529A1 (en) * 1990-08-07 1992-02-12 Fuji Photo Film Co., Ltd. Substrate for lithographic printing plate
EP0640877A1 (en) * 1993-08-05 1995-03-01 Agfa-Gevaert N.V. Imaging element and method for making aluminum lithographic printing plates according to the silver salt diffusion transfer process
GB2281128A (en) * 1993-08-13 1995-02-22 Mitsubishi Paper Mills Ltd Lithographic printing plate material
US5427889A (en) * 1993-08-13 1995-06-27 Mitsubishi Paper Mills Ltd. Lithographic printing plate with pitted aluminum support
GB2281128B (en) * 1993-08-13 1997-03-26 Mitsubishi Paper Mills Ltd Lithographic printing plate
WO1995018019A1 (en) * 1993-12-27 1995-07-06 Hoechst Aktiengesellschaft Thermal process for applying hydrophilic layers on hydrophobic substrates and use of thus coated substrates as carriers for offset printing plates
US5967047A (en) * 1993-12-27 1999-10-19 Agfa-Gevaert Ag Thermal process for applying hydrophilic layers to hydrophobic substrates for offset printing plates
EP0835764A1 (en) * 1996-10-11 1998-04-15 Fuji Photo Film Co., Ltd. Lithographic printing plate, method for producing lithographic printing plate, and method for producing support for lithographic printing plate
US6232037B1 (en) 1996-10-11 2001-05-15 Fuji Photo Film Co., Ltd. Lithographic printing plate, method for producing lithographic printing plate, and method for producing support for lithographic printing plate
US6551760B2 (en) 1996-10-11 2003-04-22 Fuji Photo Film Co., Ltd. Lithographic printing plate, method for producing lithographic printing plate, and method for producing support for lithographic printing plate

Also Published As

Publication number Publication date
JPS57500329A (en) 1982-02-25
IT8120247A0 (en) 1981-03-10
AT375880B (en) 1984-09-25
IT8120247A1 (en) 1982-09-10
EP0048721A1 (en) 1982-04-07
BR8107432A (en) 1982-01-05
IT1168081B (en) 1987-05-20
ATA133280A (en) 1984-02-15
NL8003326A (en) 1981-10-01
BE883547A (en) 1980-09-15

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