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
  • B41N1/00—Printing plates or foils; Materials therefor
  • B41N1/04—Printing plates or foils; Materials therefor metallic
  • B41N1/08—Printing plates or foils; Materials therefor metallic for lithographic printing
  • B41N1/083—Printing plates or foils; Materials therefor metallic for lithographic printing made of aluminium or aluminium alloys or having such surface layers
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C21/00—Alloys based on aluminium

Definitions

• the invention relates to a carrier material for printing plates made of a specific aluminum alloy containing iron and manganese and a printing plate based on such a carrier material and at least one reproduction layer.
• Reproduction layers sensitive to radiation are used, for example, in the production of offset printing forms or photoresists, ie they are generally applied to a layer support by the consumer or by the industrial manufacturer.
• Metals such as zinc, magnesium, chromium, copper, brass, steel, silicon, aluminum or combinations of these metals, plastic films, paper or similar materials are used as layer supports in these copying materials.
• These supports can be modified without a modifying pretreatment, but preferably after carrying out a surface modification such as mechanical, chemical and / or electrochemical roughening, oxidation and / or treatment with hydrophilizing agents (especially in the case of supports for offset printing plates made of aluminum or one of its alloys) radiation-sensitive reproduction layer can be coated.
• the usual radiation-sensitive reproduction layers usually contain an organic binding in addition to at least one radiation-sensitive compound agents (resins or the like) and optionally also plasticizers, pigments, dyes, wetting agents, sensitizers, adhesion promoters, indicators and other customary auxiliaries.
• These reproduction layers are developed after their irradiation (exposure) in order to produce an image from them, for example a printing form is obtained in this way.
• those with a high Al content of more than 99.0%, in particular at least 99.5% are generally distinguished by good to very good roughening properties, but they are often not suitable for modern processing methods from printing plates to printing forms are sufficiently temperature-stable, i.e. they tire, for example as a result of the high temperatures of more than 180 * C, in particular also of more than 240 * C, which are required when baking positive reproductive layers, although aluminum alloys with a lower Al content can often have one show better temperature stability, but are usually inferior in their roughening properties, especially in the uniformity of the roughening topography.
• the alloy is produced by casting the alloy with a certain growth rate on the solidification front and a certain temperature gradient in the liquid metal near the solidification front and a subsequent hot and / or cold working of the cast alloy with the aim of reducing the cross section by at least 60%.
• a preferred range for an Al-Fe-Mn alloy has an Fe content of 1.4 to 2.0% and an Mn content of 0.3 to 1.2%, this special alloy also containing Zn, Li, Cu, Mg and Si contains up to 1.5% in total and up to a maximum of 1.0% individually (single component), as well as other elements such as Ni, Cr, Co or B up to 1.0% in total and up to at a maximum of 0.3% each.
• the object of the present invention is to develop a carrier material for printing plates which at least corresponds to the better materials of the prior art in the quality of the surface topography after the roughening, in particular the electrochemical roughening, without, however, having their disadvantages in the thermal treatment.
• the invention is based on the known carrier materials lien for printing plates made of an aluminum alloy containing iron (Fe) and manganese (Mn), the Fe content being greater than the Mn content.
• the carrier material according to the invention is then characterized in that the Fe content is 1.2 to 2.1%, the Mn content is 0.1 to 0.9 and the sum of the Fe and Mn content is 1.3 to 2 , Amount to 2%.
• the sum of the Fe and the Mn content is 1.5 to 2.2%.
• the Fe content is 1.45 to 1.6%
• the Mn content is 0.35 to 0.5%
• the sum of the Fe and Mn content is 1.8 to 2.1 %.
• Another object of the invention is a printing plate based on such a carrier material and at least one radiation-sensitive reproduction layer applied to the carrier material, the carrier material being in mechanically, chemically and / or electrochemically roughened and optionally anodically oxidized and hydrophilized form.
• the aluminum alloy used for the carrier material according to the invention which is in strip, plate or foil form, can be produced in particular according to the information in DE-C 24 23 597.
• the metal is cast so that there is essentially no nucleation of intermetallic particles in the molten metal in front of the front between the liquid and solid metals.
• eutectic alloy is used in the this context also mean a range of compositions of the alloys in the vicinity of the eutectics, in which it is possible to achieve the simultaneous deposition of the metallic aluminum phase and one or more fibrous intermetallic phases.
• the casting alloy After the casting alloy has been produced, its further processing can be carried out by hot and / or cold machining (for example rolling), a cross-section reduction of at least 60% being achieved.
• hot and / or cold machining for example rolling
• cold processing means processing at a temperature of less than 250 * C.
• strip casting can also take place. For example, the cast alloy is heated to about 500 ° C and the hot rolling of the billet begins to descend to about 260 to 330 ° C at that temperature.
• the strip thickness is reduced, for example, from approximately 3.0 mm to approximately 0.8 or approximately 0.3 mm
• a further cold rolling can follow, in which the about 0.8 mm thick tape is also reduced to about 0.3 mm.
• the carrier materials used have a thickness of 0.1 to 0.5 mm in particular, but deviations downwards and upwards are also possible.
• the alloy can also contain Si (but preferably not more than 0.1%), Cu (preferably but not more than 0.3%), Mg (but preferably not more than 0.1%) X), Ti (but preferably not more than 0.1%), Zn (preferably but not more than 0.1%), Ni (preferably but not more than 0.3%) and / or Co (but preferably not more than 0.3%), the sum of these elements should preferably not exceed 0.4%.
• the alloy used according to the invention can also contain a maximum of 0.15% and individually a maximum of 0.05% of the elements B, Be, Bi, Ca, Cr, Ga, Li, Na, Pb, Sb, Sn, V and / or Zr included.
• the alloy used according to the invention differs from the prior art in the field of carrier materials for printing plates on the one hand by a high Fe content and a relatively high Mn content for a high Fe content and on the other hand by a high sum of both components.
• the carrier materials for printing plates are preferably mechanically (e.g. by brushing and / or with abrasive treatments), chemically (e.g. by means of) in tape form or also in plate or film form before the reproduction layer is applied Etching agent) or electrochemically (eg by alternating current treatment in aqueous HC1 or HN0 3 solutions) roughened on one or both sides; in particular, they are roughened mechanically and electrochemically or only electrochemically.
• the average roughness depth R z of the roughened surface is in the range from about 1 to 15 pm, especially in the range of 1.5 to 10 pm.
• the roughness depth is determined in accordance with DIN 4768 in the version from October 1970, the roughness depth R z is then the arithmetic mean of the individual roughness depths of five adjacent individual measuring sections.
• the flat support material Before the roughening, the flat support material can be pre-cleaned; it includes, for example, treatment with aqueous NaOH solution with or without degreasing agent and / or complexing agents, trichlorethylene, acetone, methanol or other commercially available aluminum stains.
• an abrasive treatment can additionally be carried out, in particular a maximum of 2 g / m 2 being removed (up to 5 g / m 2 between the stages);
• aqueous solutions of alkali metal hydroxide or aqueous solutions of alkaline salts or aqueous acid solutions based on HN0 3 , H 2 SO 4 or H 3 PO 4 are used as abrasive solutions.
• non-electrochemical treatments are also known which essentially have only a rinsing and / or cleaning effect and, for example, for removing deposits formed during roughening ("Schmant") or simply for removal serve from leftovers; For example, dilute aqueous alkali hydroxide solutions or water are used for these purposes.
• an anodic oxidation of the carrier material can then optionally follow in a further process step to be used, for example in order to improve the abrasion and adhesion properties of its surface (s).
• the usual electrolytes such as H 2 S0 4 , H 3 P0 4 , H 2 C 2 0 4 , amidosulfonic acid, sulfosuccinic acid, sulfosalicylic acid or mixtures thereof can be used for anodic oxidation; in particular, H 2 S0 4 and H 3 P0 4 are used alone, in a mixture and / or in a multi-stage anodizing process.
• the layer weights of aluminum oxide range from 1 to 10 g / m 2 , corresponding to a layer thickness of approximately 0.3 to 3.0 ⁇ m.
• the stage of anodic oxidation of the carrier material can also be followed by one or more post-treatment stages.
• These post-treatment stages serve in particular to additionally increase the hydrophilicity of the aluminum oxide layer, which is often sufficient, while at least the other known properties of this layer are retained.
• Reproduction layers sensitive to radiation are to be understood in principle as those which, after irradiation (exposure), possibly with subsequent development and / or fixation, provide an imagewise surface from which printing can take place.
• photoconductive layers such as z. B. in DE-C 11 17 391, 15 22 497, 15 72 312, 23 22 046 and 23 22 047 can be used.
• the substrate materials according to the invention have properties for the printing plate application area that exceed the qualities of the prior art, that is to say they are in particular temperature-stable and at the same time, even after roughening, preferably after electrochemical roughening, they show a practical surface topography which is required for contemporary high-performance printing plates; This combination of properties has not yet been achieved with the aluminum alloys previously used and / or described in the lithography field. This offers particular advantages in the production of printing plates with positive-working reproduction layers, which are often burned in to achieve longer print runs, ie the exposed and developed printing plate is heated to a temperature of more than 180 * C before printing in order to make the image areas more resistant close. If these printing plates have a carrier material with the alloy composition according to the invention, strength problems in the carrier material occur to a reduced extent after baking.
• the radiation-sensitive layer is either a negative-working layer containing a reaction product of polyvinyl butyral with propylene sulfonyl isocyanate, a polycondensation product composed of 1 mol of 3-methoxy diphenylamine-4-diazonium sulfate and 1 mol of 4,4'-bismethoxymethyl-diphenyl ether precipitated as mesitylene sulfonate, H 3 P0 4 , Victoriareinblau FGA and phenylazodiphenylamine or a positive working with a content of a cresol-formaldehyde novolak, 4- (2- Phenyl-prop-2-yl) -phenyl ester of naphthoquinone- (1,2) -diazide- (2) -sulfonic acid- (4), polyvinylbutyral, naphthoquinone- (1,2) -diazid- (2) -sulfonic acid chloride- (
• Example 1 The procedure of Example 1 is followed, but a strip made of the aluminum alloy "pure aluminum” (or “1050") is used as the starting material (Fe content 0.4%, practically no Mn content).
• Example 1 The procedure of Example 1 is followed, but a strip made of the aluminum alloy "1100" is used as the starting material (Fe content 0.375%, practically no Mn content).
• Example 1 The procedure of Example 1 is followed, but a strip made of the aluminum alloy "3003" is used as the starting material (Fe content 0.15%, Mn content 0.7%).
• Example 2 The procedure is as described in Example 1, but the starting material is an aluminum alloy strip with an Fe content of 1.6% and a Mn content of 0.5% (the remaining elements are a maximum of 0.35%) The rest is aluminum).
• Example 2 The procedure is as described in Example 1, but as a starting material a strip made of an aluminum alloy with an Fe content of 1.5% and a Mn content of 0.5% (the remaining elements are a maximum of 0.35%) The rest is aluminum).
• Example 2 The procedure is as described in Example 1, but as a starting material a band made of an aluminum alloy with an Fe content of 1.45% and a Mn content of 0.5% (the remaining elements are a maximum of 0.3%) The rest is aluminum).
• Example 2 The procedure is as described in Example 1, but as a starting material a band made of an aluminum alloy with an Fe content of 1.45% and a Mn content of 0.35% (the remaining elements are a maximum of 0.3%) The rest is aluminum).
• the roughening topography is most uniform (i.e. uniformity of the hole distribution, little to no scars) with V1 and Examples 1 to 5 according to the invention, with V2 and V3 the quality is already significantly poorer.
• the yield strength and the tensile strength at room temperature and between 100 and 300 ° C. are determined at specific temperature intervals.
• the carrier materials according to the invention are at the level of V3.
• V1 and V2 are significantly below these values.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Printing Plates And Materials Therefor (AREA)
• Laminated Bodies (AREA)
• Exhaust Silencers (AREA)
• Superconductors And Manufacturing Methods Therefor (AREA)
• Photosensitive Polymer And Photoresist Processing (AREA)
• Manufacture Or Reproduction Of Printing Formes (AREA)
• Chemical Treatment Of Metals (AREA)

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• 1984
  • 1984-07-13 DE DE19843425860 patent/DE3425860A1/de not_active Withdrawn
• 1985
  • 1985-07-02 EP EP85108168A patent/EP0170078B1/fr not_active Expired
  • 1985-07-02 DE DE8585108168T patent/DE3564701D1/de not_active Expired
  • 1985-07-02 AT AT85108168T patent/ATE36872T1/de active
  • 1985-07-09 AU AU44724/85A patent/AU571983B2/en not_active Ceased
  • 1985-07-09 US US06/753,133 patent/US4672022A/en not_active Expired - Fee Related
  • 1985-07-10 ZA ZA855195A patent/ZA855195B/xx unknown
  • 1985-07-11 FI FI852747A patent/FI852747L/fi not_active Application Discontinuation
  • 1985-07-12 ES ES545166A patent/ES8607833A1/es not_active Expired
  • 1985-07-12 BR BR8503340A patent/BR8503340A/pt unknown
  • 1985-07-12 JP JP15258285A patent/JPS6135995A/ja active Pending

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