EP0704320A1 - Procédé pour rendre rugueux par moyens mécaniques la surface d'un support pour l'impression et brosse cylindrique à cet effet - Google Patents

Procédé pour rendre rugueux par moyens mécaniques la surface d'un support pour l'impression et brosse cylindrique à cet effet Download PDF

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Publication number
EP0704320A1
EP0704320A1 EP95114953A EP95114953A EP0704320A1 EP 0704320 A1 EP0704320 A1 EP 0704320A1 EP 95114953 A EP95114953 A EP 95114953A EP 95114953 A EP95114953 A EP 95114953A EP 0704320 A1 EP0704320 A1 EP 0704320A1
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EP
European Patent Office
Prior art keywords
brush
fibers
strips
brush roller
roller according
Prior art date
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Granted
Application number
EP95114953A
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German (de)
English (en)
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EP0704320B1 (fr
Inventor
Stephan J. W. Dr. Platzer
Walter Dipl.-Phys. Mackert
Rudolf Dr. Dipl.-Chem. Neubauer
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Agfa Gevaert AG
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Hoechst AG
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
    • B24B29/005—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents using brushes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S15/00—Brushing, scrubbing, and general cleaning
    • Y10S15/06—Varied composition bristle

Definitions

  • the invention relates to a method for mechanically roughening the surface of a printing plate support made of aluminum or an aluminum alloy by wet brushing and a brush roller for carrying out the method.
  • supports for photosensitive printing plates requires a roughening of the support surface, which is generally done by roughening first mechanically and then electrochemically in an electrolyte.
  • Mechanical roughening can be done by wire brushing, sandblasting, wet and dry brushing techniques, ball milling and the like techniques.
  • the printing process is carried out using a printing plate with a substantially flat surface.
  • the printing plate is prepared by roughening and chemical treatment, whether it is a purely chemical treatment in a solution or an electrochemical treatment, in such a way that a printing surface is obtained which in the printing areas only takes on the oily printing ink and water rejects and conversely takes on water in the non-printing areas and rejects the printing ink.
  • the processed printing plate is moistened and the printing ink is applied.
  • the printing plate is then pressed against a rubber base during offset printing, which transfers the printing image colored by the printing ink onto the paper to be printed, or is pressed directly against the paper when printing directly. High-quality images are sought, which should be without any noticeable preferred direction.
  • An undesirable direction can occur if the surface of the printing plate has a non-uniform structure. Furthermore, strive to produce consistent, high quality images using the same plate and plate type. A non-reproducible image can occur if the surface of the printing plate is not of a constant quality or does not maintain its surface quality during a high print run.
  • a photosensitive printing plate is made by applying a photosensitive layer to a roughened support, which is generally made of aluminum or an aluminum alloy.
  • a roughened support which is generally made of aluminum or an aluminum alloy.
  • the surface is roughened either mechanically, purely chemically, electrochemically or in combination of two or three of these techniques.
  • the roughening is usually followed by an etching process, anodizing and a treatment of the surface which makes it hydrophilic, if it should be necessary.
  • a light-sensitive layer is applied to the roughened surface in order to obtain a presensitized printing plate. This is exposed imagewise by means of actinic rays, developed and preserved in order to obtain a processed printing plate, which is then used in a printing press for printing.
  • the spray nozzles are subject to great wear due to the abrasive sand particles and have to be replaced frequently.
  • electrochemical roughening the electrical energy consumption is high and there are problems in depositing the acidic solutions which contain dissolved aluminum ions. If a purely chemical roughening is considered, the residence time of the carrier in the chemical bath is relatively long compared to the electrochemical roughening.
  • the bristles of the brushes are usually made of plastic such as nylon or polypropylene and the wet brushing is carried out until the desired surface roughness is achieved.
  • the disadvantage here is that the bristles made of plastic are subject to great abrasion and that the edges of the carrier material cut off the bristles, so that the bristles in the edge regions are considerably shorter than in the other regions of the brush. If a wider carrier tape is then brushed, the shorter bristles can only insufficiently roughen the wider carrier tape in these edge areas, so that a considerably weaker roughness is achieved in comparison to the other areas.
  • wire brushes are used for wet brushing instead of plastic brushes, there are the disadvantages already mentioned that the roughness of the surface of the carrier material is not uniform but rather indicates a preferred orientation. As the bristles wear out, the roughness of the carrier surface also changes.
  • a brush roller is known from US Pat. No. 4,714,528, column 4, lines 45 to 66, which is used in wet brushing.
  • a support made of aluminum or an aluminum alloy containing 99% by weight of aluminum and small amounts of silicon, iron, copper, zinc, manganese, magnesium, chromium, lead, bismuth, calcium, indium, galium, nickel and the like is included a slurry under high liquid pressure, which slants against the surface of the support.
  • the slurry contains finely ground powder of abrasive substances and, if necessary, may also contain an acid or a base.
  • the brush roller consisting of nylon fibers, polypropylene fibers, animal hair, steel wire or the like, and the fibers or bristles having a uniform length and being evenly distributed on the base part of the brush roller.
  • the length of the bristles or fibers is 10 to 150 mm and the diameter of the individual fibers or wires ranges from 0.1 mm to 1.5 mm.
  • the brush roller is moved at a speed in the range of 200 to 2000 revolutions per minute.
  • the abrasive slurry is sprayed onto the carrier under high liquid pressure through a spray nozzle before the carrier passes the brush rollers which are pressed against the carrier so that the carrier surface is roughened with constant pressure between the support rollers and the brush rollers.
  • the roughened surface of an aluminum carrier has an average roughness R a of 0.3 to approximately 1.2 ⁇ m, in particular 0.35 to 0.8 ⁇ m.
  • the object of the invention is to improve and further develop a wet brushing method for roughening carrier materials for printing plates in such a way that very uniform mean roughness values are obtained without pronounced directional orientation and that only a slight wear of the brush roller material in the Comparison to known brush rollers occurs.
  • a brush roller used in the method is also to be created, which has a longer service life than conventional brush rollers while the center roughness remains the same.
  • This object is achieved according to the method in such a way that wet brushing is carried out with simultaneous use of organic fibers and metal wires arranged next to one another, with a slurry of 5 to 80% by weight of abrasive particles in water.
  • the ratio of the organic fibers to the metal wires is in the range from 0.01 to 10.
  • the ratio of the organic fibers to the metal wires is preferably in the range from 0.05 to 5, in particular it is 0.1 to 1, 0.
  • the particle size in the slurry is 1 to 500 ⁇ m, in particular 20 to 50 ⁇ m.
  • the wet brushing is carried out in such a way that the mechanically measured mean roughness values R a differ from one another in the running direction of the printing plate carrier and transversely to the running direction by a maximum of 14%, based on R a in the running direction.
  • the mean roughness values R a in the running direction are in the range from 0.32 to 0.47 ⁇ m and the mean roughness values R a in the direction of the running direction are in the range from 0.35 to 0.50 ⁇ m. It generally applies that the average roughness values R a can be in each case in the range from 0.2 to 0.6 ⁇ m.
  • a brush roller for performing the method, with a surface occupied by brush strips is characterized in that the brush strips contain both fibers and wires and that the fiber material is different from the wire material.
  • two groups of brush strips are arranged above the roller surface, each group of brush strips consisting of a specific material in the form of fibers or wires, and the brush strips form a repeating pattern of a first number of brush strips of one group and one second number of brush strips of the other group. It is also possible that the single brush strip contains a mixture of fibers and wires and that the fiber material is different from the wire material.
  • the material of the brush strips of one group is a polymer, while the material of the brush strips of the other group is a metal.
  • Brush strips 2 and 3 are distributed over a roller surface 7 of a brush roller 1, of which the front side of a first fiber and a first wire can be seen in the cross section of FIG.
  • the individual brush strip 2 or 3 consists of a plurality of in the direction of view 1, fibers or wires lined up one behind the other and extends over the entire width of the brush roller 1, which runs perpendicular to the plane of the drawing in FIG.
  • the fibers of a group 4 of the brush strips 2 are polymer fibers and are shown in FIG. 1 with a greater thickness than the wires of a further group 5.
  • the polymer of the brush strips 2 is selected from the group consisting of polyamides, polyacrylonitriles, polyesters, polyethylenes, polyimides, polyolefins, polypropylenes, polyurethanes, polyvinyl chlorides and cellulose derivatives.
  • a preferred fiber material for the brush strips 2 are polyamides such as nylon 6, nylon 6.6; Nylon 6.10 and nylon 6.12. To increase the abrasion resistance of the polyamides, they are filled with inert particles such as silicon carbide.
  • the metal of the wires of the brush strips 3 is selected from the group of stainless steel, steel, aluminum, brass, bronze, copper, iron and alloys of these metals. Stainless steel is preferably used for the brush strips 3 because of its high abrasion resistance and its low cost.
  • each of the individual brush strips 2 and 3 is formed either only from polymer fibers or only from metal wires, while in the second embodiment of the brush roller 7 shown in FIG. 2 this is not the case.
  • a lower brush strip 8 consists of groups 12 of metal wires 33 and groups 13 of polymer fibers 22.
  • the individual group 12 comprises, for example, two metal wires 33 and the individual group 13 comprises four polymer fibers 22.
  • the upper brush strip 9 consists of Groups 10 of metal wires 33 and groups 11 of polymer fibers 22, the individual group 10 each having two metal wires and the individual group 11 each having four polymer fibers.
  • the groups 10 and 11 of the one category of brush strips 9, of which only a single brush strip is shown in FIG. 2 can match the groups 12 and 13 of the other category of brush strips 8, of which only a single one in FIG. 2 Brush strips is shown, cover in their patterns or offset from each other, as can be seen from Figure 2.
  • Carrier plates or strips which are essentially roughened in the process according to the invention, consist of pure aluminum or an aluminum alloy.
  • the alloy is composed of aluminum as the main component and small amounts of silicon, iron, copper, zinc, manganese, magnesium, chromium, lead, bismuth, calcium, indium, gallium, nickel, and the like.
  • the aluminum has a proportion of ⁇ 98% by weight.
  • the thickness of the aluminum support is selected in the range between 0.01 and 0.5 mm, in accordance with the sizes of breaking strength, bending strength, mechanical resistance, elongation and the like, which must be taken into account for a specific application of a lithographic printing plate in a printing press.
  • Steel plates or straps can also be used, but are not widely used because of their relatively high weight and stiffness.
  • one or both sides of the aluminum carrier are cleaned, degreased and / or etched by known methods. These methods include treatment with a solution containing sodium hydroxide with or without a degreasing and etching agent.
  • the mixtures can also contain chemicals such as acetone, methanol, trichlorethylene and the like.
  • the solution may further contain an aluminum ion source such as sodium aluminate up to a concentration corresponding to the saturation point to aid process consistency.
  • concentrations and other treatment conditions depend on the specific surface roughness to be set. This process step can generally last from 5 seconds to 5 minutes. Then the surface is subjected to wet brushing with a slurry.
  • the slurry consists of water and a finely divided powder of an abrasive.
  • the fine powdery abrasive is used in a concentration of 5 to 80% by weight in the slurry, in particular in the range between 15 to 40% by weight.
  • the slurry may also contain an acid or an alkali, if necessary.
  • Other additives such as thickeners, surface treatment agents, and flocculants and the like may also be included.
  • Suitable abrasive agents include diamond dust, quartz, flint, granite, alumina, silica, diatomaceous earth, sand, emery, abrasives made of iron and aluminum silicates, talc, pumice, corundum, dolomite, magnesium oxide, alumina, zirconia, iron, tungsten carbide and the like or the like or one Combination of two or more of the agents listed above.
  • the abrasives have an average particle size in the range between 5 and 500 ⁇ m, preferably between 10 and 100 ⁇ m, particularly preferably between 20 and 50 ⁇ m.
  • the feeding device for the abrasive slurry comprises a container with a capacity in the range between 100 and 10,000 liters, in particular between 1,000 and 5,000 liters.
  • a slurry stirring device is located in the container to prevent solid particles from precipitating.
  • the stirring device can be, for example, a propeller stirrer which extends into the container or a system for circulating the slurry. Constant movement of the slurry prevents the solids in the slurry from depositing.
  • a pump conveys the slurry to a distribution nozzle.
  • the pumping capacity is set for an aluminum carrier belt in such a way that the distribution width, the belt speed, the brush speed and the solids in the slurry are taken into account.
  • a pump capacity of 400 liters per minute is applied for a distribution width of 1 m, a belt speed of 50 meters per minute, a brush speed of 500 revolutions per minute and a solids content of 20% by weight.
  • the distributor nozzle distributes the slurry evenly over the aluminum support, especially in the form of a uniform curtain.
  • the nozzle can either have a narrow slot or a number of closely spaced holes.
  • the slurry is filtered prior to being fed to the manifold to prevent larger agglomerates that could clog the slot or holes.
  • One or more brush rollers are used for the wet brushing.
  • the brush roller or the brush rollers rotate in the opposite direction to the tape running direction of the carrier material. If the brush roller rotates in the same direction as the carrier belt, the tangential speed of the brush roller must differ from the belt running speed.
  • the distributor nozzle applies the slurry to the aluminum support just before each brush roller.
  • the brush rollers can be on one or both sides of the carrier tape.
  • the carrier belt is preferably transported horizontally when the brush rollers are on one side, namely above the carrier belt, and is conveyed vertically when the brush rollers are arranged on both sides of the carrier belt.
  • the number of revolutions of the brush rollers is in the range between 100 and 5,000 revolutions per minute, preferably between 200 and 500 revolutions per minute.
  • the diameter of the individual brush roller is 0.1 to 1 m.
  • the contact distance between the circumference of the brush roller and the aluminum strip carrier is an important factor at a given point in time when determining the roughness of the carrier material. The distance is determined by the geometry of the rollers before and after the brush roller, the carrier tape tension, the brush roller diameter and the like parameters. The distance can be between 10 and 1,000 mm, preferably between 50 and 500 mm. In general, if the contact distance is long, fewer brush rollers are required.
  • the object of the invention is that the brush roller or brush rollers are neither pure metal wire brushes nor pure polymer fiber brushes, but instead have groups or brush strips which consist of a combination of organic polymer fibers and metal wires.
  • the ratio between the fibers and the wires is selected in a range between 0.01 and 10, preferably between 0.05 and 5, and in particular between 0.1 and 1.0.
  • the thickness of the fibers is in the range between 0.05 and 3 mm, in particular between 0.1 and 0.5 mm.
  • the thickness of the wires is generally less than that of the fibers and ranges between 0.03 and 2 mm, preferably between 0.07 and 0.3 mm.
  • the length of the fibers and wires is the same after being attached to the surface of the roller, and their length is 5 to 300 mm, preferably 10 to 100 mm.
  • the tufts of fibers and / or metal wires are attached to the roller as brush strips.
  • the brush strips contain a suitable mixture of fibers and wires. Some of the strips can optionally contain only fibers and others only metal wires, brush strips of this type being shown in the embodiment according to FIG. 1. Such brush strips are alternately mounted on the brush roller circumference.
  • the fibers consist of organic polymers which are selected from the group of polyacrylonitriles, polyamides, polyesters, polyethylenes, polyimides, polyolefins, polypropylenes, polyurethanes, polyvinyl chlorides and cellulose derivatives.
  • the preferred fibers consist of aliphatic polyamides, namely of different nylon variants. Nylon 6, nylon 6.6; Nylon 6.10 and nylon 6.12.
  • the polymer fibers can be filled with inert particles such as silicon carbide to increase their abrasion resistance.
  • the metal wires consist of metals such as aluminum, brass, bronze, copper, iron or the alloys of these metals, as well as steel, in particular stainless steel, which does not rust in the aqueous slurry solutions.
  • each brush roller is electrically isolated to prevent current flow through the brush roller.
  • the excess slurry is squeezed and / or rinsed off the roughened surface of the support.
  • Embedded particles of the slurry are removed by etching the roughened aluminum surface. The etching is carried out using an alkaline solution, which is applied to the brushed surface.
  • Preferred alkaline solutions contain sodium hydroxide, potassium hydroxide, sodium metasilicate, sodium carbonate, sodium aluminate and sodium gluconate.
  • the etching treatment can also be carried out using an acidic solution containing acids such as fluoric acid, hydrochloric acid, nitric acid, phosphoric acid and sulfuric acid.
  • the etching is preferably carried out at a temperature ranging from room temperature to 90 ° C. for a period of 5 to 300 seconds with an etching solution which has a concentration of 1 to 50% by weight until about 0.01 up to 10 g / m2 aluminum is etched away.
  • An alkali-etched aluminum surface often contains alkali-insoluble substances, namely dirt. The surface is then cleaned of dirt with an acidic solution such as an aqueous solution of nitric acid, sulfuric or phosphoric acid.
  • the aluminum carrier surface wet-brushed with a slurry is roughened electrochemically.
  • the electrochemical roughening takes place in an electrolyte which contains acids, such as, for example, nitric acid or hydrochloric acid with additives, such as boric acid, hydrogen peroxide, aluminum chloride and aluminum nitrate up to a concentration corresponding to the saturation point, in order to support the process consistency and to strengthen the electrical conductivity of the electrolyte.
  • the electrochemical roughening can take place in two steps, namely a first step with nitric acid, followed by a second step with hydrochloric acid.
  • the nitric or hydrochloric acid is present in the aqueous electrolyte in a proportion of 1 to 20 grams per liter, while maintaining a temperature of 20 to 60 ° C of the electrolyte.
  • Current is applied over the aluminum support and an electrode made of lead or stainless steel over a distance of 0.1 to 20 cm.
  • the applied current density is 0.1 to 200 A / dm2.
  • the current is direct current or preferably alternating current, or a combination of the two types of current.
  • the roughening time ranges from 1 to 300 seconds, in particular it is less than 30 seconds.
  • the preferred operating parameters of the above sizes are selected within the ranges specified or can be changed within these ranges if necessary.
  • the excess acid on the electrochemically roughened aluminum carrier is squeezed off and / or rinsed off before the next additional treatment.
  • a wet-brushed and additionally electrochemically roughened aluminum surface is usually anodized by one of the known methods. This is done in electrolytes containing sulfuric, phosphoric or oxalic acid in concentrations up to 200 grams per liter, at a temperature between 20 and 70 ° C.
  • the anodizing is preferably carried out with direct current, current densities of up to about 60 A / dm 2 being applied in order to produce an oxide layer of up to 10 grams per m 2, in particular from 0.3 to 5 grams per m 2.
  • the electrical voltage is 1 to 100 volts and the residence time in the electrolyte is 1 to 300 seconds, in particular 15 seconds.
  • the electrolyte used for the anodizing may also contain further, known and useful components, such as aluminum sulfate with a concentration up to the saturation point, in order to support the process consistency and to increase the electrical conductivity of the electrolyte.
  • An aluminum substrate with a roughened surface which has an anodized layer, has excellent hydrophilicity and can be coated directly with a light-sensitive layer.
  • the support can also be subjected to a hydrophilic treatment in a known manner before the photosensitive layer is applied.
  • the support can be provided with a silicate layer using an alkali metal silicate or with a polymer layer using a polyvinylphosphonic acid.
  • a photosensitive layer generally comprises a photosensitizer and a resin binder. It can furthermore contain additional constituents such as dyes, plasticizers, acid stabilizers, surface agents, antistatic compositions, UV absorbers, optical brighteners, inert fillings, lubricants and remaining coating solutions.
  • a preferred negative working photosensitizer is a photosensitive polymer diazonium salt.
  • a preferred positive working photosensitizer is a photosensitive naphthoquinone diazide.
  • Other photosensitizers include azides, photo-cleavable compounds and photo-curable compounds. Some photosensitizers require an additional coating, in particular to prevent the ingress of oxygen.
  • the resin binder can be selected from a group consisting of vinyl acetal polymers, styrene / maleic anhydride copolymers and phenolic resins.
  • the proportion of the resin binder in the photosensitive layer is preferably 30 to 95% by weight, in particular 50 to 90% by weight.
  • the photosensitive layer can also be coated with a spacer layer in order to reduce the vacuum suction time during exposure.
  • the photosensitizer has a proportion of 5 to 70% by weight, preferably 10 to 50% by weight in the photosensitive layer.
  • the additives to the photosensitive layer can be mixed with compatible solvents such as ethanol, ethylene glycol monomethyl ether, gamma-butyrolactone, Propylene glycol monomethyl ether and mixed with diethyl ketone.
  • the brushed aluminum surface is then coated with such a solution.
  • the photosensitive layer has a preferred dry layer weight between 0.1 and 5 g / m2, in particular from 0.2 to 2 g / m2.
  • the photosensitive layer is exposed imagewise according to known techniques. Such exposure can be carried out using a UV light source through a film mask under vacuum frame conditions. Mercury vapor discharge lamps and metal halide lamps are preferred. Other sources of radiation are carbon arc lamps, pulsed xenon lamps and lasers.
  • Light absorption filters can be used to reduce light radiation in the material.
  • the photosensitive layer is developed by removing the non-image areas from the photosensitive layer using a suitable developer and then dried. Any developer solution which satisfactorily removes the non-image areas of the photosensitive layer after exposure while keeping the image areas can be used.
  • Suitable developer compositions include solutions containing additives such as sodium metasilicate, trisodium phosphate, monosodium phosphate and alkyl hydroxyls in water for diazide coatings, n-propanol in water for diazonium salt coatings and benzene for azide coatings.
  • the developed image on the printing plate is protected by a preservation treatment.
  • Carrier material made of an aluminum alloy 1100 with a maximum belt width of 1.3 m and a thickness of 0.3 mm is at a belt running speed of 18 m / min prepared for the production of a printing plate.
  • the carrier tape is first cleaned, degreased and lightly etched by treatment in an aqueous alkali solution containing about 20 g per liter of sodium hydroxide, aluminum ions and a degreasing agent, keeping the temperature at about 65 ° C for a 7 second residence time.
  • the carrier tape is then wet-brushed with a slurry, the brush roller having a diameter of 0.6 m, a width of 1.5 m and a speed of rotation of 500 revolutions per minute.
  • the brush strips are attached across the roller width, of which 60 brush strips contain nylon 6.6 fibers with a diameter of 0.3 mm and the remaining 20 brush strips contain stainless steel wires with a diameter of 0.1 mm.
  • the brush strips are arranged in repeating groups of 3 strips of nylon with a strip of metal.
  • the contact distance of the brush roller with the aluminum surface is 550 mm.
  • the slurry consists of 20% by weight of abrasive particles in water. The particles consist of 99.6% by weight of silicon oxide, 0.1% by weight of aluminum oxide, 0.02% by weight of iron oxide and 0.2% by weight of other materials. The average particle size is 19 ⁇ m.
  • the slurry comprises 3000 liters, which are under constant circulation and are applied to the brush rollers at 200 liters per minute.
  • the roughened carrier tape is then rinsed with water, squeezed off, dried, anodized, hydrophilized and dried again.
  • the anodization is carried out with a solution at 45 ° C. which contains 150 g per liter of concentrated sulfuric acid (95 to 98% by weight) and approximately 6 g per liter of aluminum sulfato octadecahydrate.
  • the direct current density is 26 A / dm 2 and the direct current is intermittently turned on for a total of 8 seconds, producing an oxide layer of 2 g / m 2.
  • the anodized surface is made hydrophilic by immersion in an aqueous solution containing 2.2% by weight of polyvinylphosphonic acid at a temperature of 75 ° C.
  • the ratio of the number of fibers to the number of metal wires is 0.3.
  • the bristles of the brush roller 1 are 40 mm long at the beginning of the wet brushing. After 250,000 m of carrier tape have been brushed, the bristles are rubbed down to a length of 7 mm.
  • the surface roughness of the substrate at the start of the wet brushing is similar to that after the passage of 250,000 m of substrate.
  • the average roughness R a is 0.38 ⁇ m in the direction of tape travel and 0.42 ⁇ m transverse to the direction of tape travel, so that the difference between the two average roughness values, based on the value in the direction of tape travel, is approximately 10.5%.
  • Example 1 The wet brushing according to Example 1 is repeated, the brush roller containing only brush strips made of nylon 6.6 fibers.
  • the bristles are rubbed down to a length of 7 mm after the passage of 30,000 m of carrier material. This means that the service life or the service life of the brush roller is only 1/8 of that of Example 1.
  • the surface roughness is similar to that in Example 1, namely with an average roughness value R a of 0.36 ⁇ m in the direction of strip travel and 0.41 ⁇ m transverse to the direction of strip travel, so that there is a difference between the two average roughness values of approximately 14%, based on the average roughness value in the direction of tape travel.
  • Example 1 is repeated with a brush roller 1, but in which 20 brush strips made of metal wire are replaced by an equal number of brush strips made of nylon 6.6 fibers with a diameter of 0.5 mm.
  • the bristles of the brush roller are worn down to 7 mm after just 30,000 m of belt run. There is no increase in the service life or the service life of the brush roller 1 in this comparative example B.
  • the surface roughness is similar to that of the example 1.
  • Example 1 is repeated with a brush roller 1, in which 60 brush strips made of fibers with a diameter of 0.3 mm by an equal number of brush strips made of fibers with a diameter of 0.5 mm and 20 brush strips made of metal wire by an equal number of Brush strips made of fibers with a diameter of 0.3 mm can be replaced.
  • a configuration of the brush roller 1 opposite to that of Comparative Example B is obtained.
  • the bristles are removed after a belt pass of 40,000 m to a length of 7 mm. This represents a slight improvement compared to comparative examples A and B, but the result is nowhere near as good as that according to example 1.
  • the mean roughness value R a changes considerably in this comparative example C and is 0.68 ⁇ m in the direction of strip travel and 0. 80 ⁇ m across the strip running direction, which results in a difference of around 17.6% based on the roughness in the strip running direction.
  • Example 1 is repeated with a brush roller 1, in which all brush strips are made of stainless steel wires.
  • the roughness is similar to that obtained by dry wire brushing, namely of shallow depth and directional.
  • Another disadvantage is that higher drawing forces are required because the wires hollow out the aluminum surface of the carrier tape moving in opposite directions.
  • Example 1 is repeated with a brush roller 1 in which the number of fiber brush strips is 70 instead of 60 and the number of metal wire brush strips 10 instead of 20.
  • the ratio of the number of fibers to the number of metal wires is 0.7.
  • the surface roughness is similar to of those in Example 1.
  • the bristles are removed to a length of 7 mm after approximately 150,000 m of belt run. Compared to comparative example A, five times the life of the brush roller 1 is obtained.
  • Example 1 is repeated, the average particle size of the slurry being 0.11 ⁇ m instead of 0.19 ⁇ m.
  • the average roughness value R a is 0.32 ⁇ m in the direction of strip travel and 0.36 ⁇ m in the cross direction of the strip.
  • Example 1 is repeated with a slurry in which the slurry concentration is 30% by weight instead of 20% by weight.
  • the average roughness value R a in the tape running direction is 0.45 ⁇ m and 0.51 ⁇ m across the tape running direction.
  • Example 4 is repeated, with the belt running speed being 45 m / min instead of 18 m / min and the anodizing current being increased in proportion to the belt running speed by a factor of 2.5 in order to obtain the same oxide weight.
  • the bristles of the brush roller 1 are removed to a length of 7 mm after a belt pass of 400,000 m.
  • the surface roughness is slightly lower compared to Example 4, but is still uniform.
  • the average roughness values are 0.37 ⁇ m in the strip running direction and 0.42 ⁇ m transverse to the strip running direction.
  • Example 5 is repeated, but all brush strips contain only nylon fibers.
  • the nylon bristles are worn down to a length of 7 mm after 48,000 m. This in turn means a reduction in the service life or the operating time of the brush rollers to 1/8 of the value in Example 5.
  • the surface roughness is similar to that of Example 4.
  • Carrier tapes made of an aluminum alloy 3003 with a maximum belt width of 1.2 m and a thickness of 0.4 mm at a belt speed of 18 m / min are prepared for roughening.
  • the tapes are first cleaned and degreased by treatment with an aqueous alkaline solution containing approximately 5% of a weakly alkaline spray degreasing and cleaning agent for metal surfaces with special additives for refining layers of phosphate layers at a temperature of approximately 55 ° C.
  • the strips are then wet-brushed with a slurry using 4 brush rollers, which have a diameter of 0.3 m and a width of 1.5 m.
  • the slurry consists of 22% by weight of abrasive particles in water. The particles are composed of 59.7% by weight of silicon oxide, 22.7% by weight of aluminum oxide and 16.6% by weight of other abrasive materials. The average particle size is 48 ⁇ m. The slurry contains 1200 liters that circulate continuously.
  • the roughened carrier tape is rinsed with water, squeezed off, dried, anodized, hydrophilized and dried again.
  • the anodization is carried out at 40 ° C. with a solution which contains 190 g per liter of concentrated sulfuric acid (95 to 98% by weight) and approximately 10 g per liter of aluminum sulfato octadecahydrate. Direct current is applied to obtain an oxide layer of 0.5 g / m2.
  • the anodized surface is immersed in an aqueous solution, the 2% polyvinylphosphonic acid contains, hydrophilized at 72 ° C.
  • the bristles on the brush roller are 40 mm long at the start of roughening.
  • the surface roughness of the material at the beginning is similar to that after the roughening of 1 million meters of carrier tape.
  • the average roughness values R a are 0.32 ⁇ m in the strip running direction and 0.35 ⁇ m transverse to the strip running direction.
  • Example 6 is repeated, but all brush strips are made of nylon 6.6 fibers.
  • the bristles are removed to a length of 7 mm after a belt pass of only 200,000 m. This means a reduction in the service life of the brush roller by a factor of 5.
  • the surface roughness is similar to that according to Example 6, namely with mean roughness values R a of 0.31 ⁇ m in the direction of strip travel and 0.35 ⁇ m transverse to the direction of strip travel.
  • Example 6 is repeated, the first brush roller having only metal wire strips and the other 3 brush rollers being equipped only with nylon fibers, instead of mixed brush strips for all 4 brush rollers.
  • the roughness of the surface is more aligned than in the case of example 6.
  • the nylon bristles are worn down to a length of 7 mm after only 200,000 m of carrier tape pass.
  • Example 6 is repeated, the first 3 brush rollers having only nylon fibers and the last brush roller being equipped with metal wires only.
  • the surface roughness is more pronounced than in Example 6 and in Comparative Example G, with an average roughness R a of 0.28 ⁇ m in the strip running direction and 0.38 ⁇ m transverse to the strip running direction.
  • the nylon bristles are worn down to the same amount as in comparative example G.
  • Example 6 is repeated with the tape being roughened on both sides. There are four brush rollers for roughening one side and 4 additional brush rollers for roughening the other side. All 8 brush rollers are equipped in a ratio of 3: 1 of the nylon fibers to metal wires, similar to example 6. The mixed bristles are removed to the same extent as indicated in Example 6.
  • the propylene glycol monomethyl ether is e.g. a product from Dow Chemical, USA.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Brushes (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP95114953A 1994-09-30 1995-09-22 Procédé pour rendre rugueux par moyens mécaniques la surface d'un support pour l'impression et brosse cylindrique à cet effet Expired - Lifetime EP0704320B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4435221A DE4435221A1 (de) 1994-09-30 1994-09-30 Verfahren zum mechanischen Aufrauhen der Oberfläche eines Druckplattenträgers und Bürstenwalze zur Durchführung des Verfahrens
DE4435221 1994-09-30

Publications (2)

Publication Number Publication Date
EP0704320A1 true EP0704320A1 (fr) 1996-04-03
EP0704320B1 EP0704320B1 (fr) 1998-12-02

Family

ID=6529774

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95114953A Expired - Lifetime EP0704320B1 (fr) 1994-09-30 1995-09-22 Procédé pour rendre rugueux par moyens mécaniques la surface d'un support pour l'impression et brosse cylindrique à cet effet

Country Status (11)

Country Link
US (2) US5775977A (fr)
EP (1) EP0704320B1 (fr)
JP (1) JPH08192586A (fr)
KR (1) KR960010905A (fr)
CN (1) CN1126669A (fr)
AT (1) ATE173980T1 (fr)
BG (1) BG100034A (fr)
BR (1) BR9504236A (fr)
DE (2) DE4435221A1 (fr)
DK (1) DK0704320T3 (fr)
ES (1) ES2124484T3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0734883A1 (fr) * 1995-03-30 1996-10-02 Fuji Photo Film Co., Ltd. Procédé pour le traitement de surfaces en aluminium pour plaques d'impression
EP0787598A3 (fr) * 1996-02-02 1997-08-27 Fuji Photo Film Co Ltd
EP0942075A1 (fr) * 1998-03-09 1999-09-15 Hans u. Ottmar Binder GbR Procédé de traitement de surface d' aluminium, des alliages d' aluminium, de magnesium ou des alliages de magnesium
EP1380417A1 (fr) * 2002-07-03 2004-01-14 Agfa-Gevaert Précurseur de plaque d'impression lithographique de type positif

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US6120640A (en) * 1996-12-19 2000-09-19 Applied Materials, Inc. Boron carbide parts and coatings in a plasma reactor
ES2138525B1 (es) * 1997-03-07 2000-08-16 Union Ind Marmolera S L Procedimiento para el tratamiento superficial de materiales petreos.
JPH11221742A (ja) 1997-09-30 1999-08-17 Hoya Corp 研磨方法及び研磨装置並びに磁気記録媒体用ガラス基板及び磁気記録媒体
JP2000301441A (ja) * 1999-04-19 2000-10-31 Nippon Micro Coating Kk 化学的機械的テクスチャ加工方法
DE60021140T2 (de) * 1999-04-22 2006-05-04 Fuji Photo Film Co., Ltd., Minami-Ashigara Verfahren zur Herstellung eines Aluminiumträgers für lithographische Druckplatten
DE10118374A1 (de) * 2001-04-12 2002-10-17 Fischer Artur Werke Gmbh Verfahren zur Herstellung eines Spreizankers
CN1326692C (zh) * 2004-07-01 2007-07-18 深圳市光韵达实业有限公司 一种镀镍金属印刷模板及其制造方法
US20090029631A1 (en) * 2005-09-23 2009-01-29 General Electric Mitigation of stress corrosion and fatigue by surface conditioning
DE102009018443A1 (de) * 2009-04-22 2010-10-28 Kullen Gmbh & Co. Kg Rotationsbürste mit unterschiedlichem Borstenbesatz
DE102010015035A1 (de) 2009-05-06 2011-08-04 Heidelberger Druckmaschinen AG, 69115 Bürste mit Kombi-Beborstung zum Reinigen eines Druckmaschinenzylinders
CN101654799B (zh) * 2009-09-15 2012-03-28 江苏工业学院 一种超高速制备高度有序多孔阳极氧化铝膜的方法
CA2811216C (fr) 2010-09-15 2015-08-25 Saint-Gobain Abrasives, Inc. Brosse impregnee d'un abrasif
DE102012201815A1 (de) * 2012-02-07 2013-08-08 Mall + Herlan Gmbh Vorrichtung und Verfahren zum Oberflächenbearbeiten von zylindrischen Körpern
DE102012109071A1 (de) * 2012-09-26 2014-03-27 Contitech Elastomer-Beschichtungen Gmbh Schleifverfahren für Druckformen im Flexo- oder Hochdruckbereich
CN108372433B (zh) * 2018-04-04 2023-08-15 盐城工学院 刀具毛刷钝化装置
KR102347254B1 (ko) * 2021-08-23 2022-01-03 윤찬호 입체감을 위한 석재 표면 처리 방법

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JPS6227191A (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
US4714528A (en) 1985-07-26 1987-12-22 Fuji Photo Film Co., Ltd. Process for producing aluminum support for lithographic printing plate
EP0595179A1 (fr) * 1992-10-28 1994-05-04 Fuji Photo Film Co., Ltd. Procédé pour la préparation d'une feuille d'aluminium utilisé comme support pour une plaque d'impression lithographique

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US3929591A (en) 1974-08-26 1975-12-30 Polychrome Corp Novel lithographic plate and method
JPS6227191A (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
US4714528A (en) 1985-07-26 1987-12-22 Fuji Photo Film Co., Ltd. Process for producing aluminum support for lithographic printing plate
EP0595179A1 (fr) * 1992-10-28 1994-05-04 Fuji Photo Film Co., Ltd. Procédé pour la préparation d'une feuille d'aluminium utilisé comme support pour une plaque d'impression lithographique

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0734883A1 (fr) * 1995-03-30 1996-10-02 Fuji Photo Film Co., Ltd. Procédé pour le traitement de surfaces en aluminium pour plaques d'impression
EP0787598A3 (fr) * 1996-02-02 1997-08-27 Fuji Photo Film Co Ltd
US5873771A (en) * 1996-02-02 1999-02-23 Fuji Photo Film Co., Ltd. Process for manufacturing lithographic printing plate support
EP0942075A1 (fr) * 1998-03-09 1999-09-15 Hans u. Ottmar Binder GbR Procédé de traitement de surface d' aluminium, des alliages d' aluminium, de magnesium ou des alliages de magnesium
EP0942076A1 (fr) * 1998-03-09 1999-09-15 Hans u. Ottmar Binder GbR Procédé de traitement de surface d' aluminium, des alliages d' aluminium, de magnesium ou des alliages de magnesium
EP1380417A1 (fr) * 2002-07-03 2004-01-14 Agfa-Gevaert Précurseur de plaque d'impression lithographique de type positif

Also Published As

Publication number Publication date
US5860184A (en) 1999-01-19
CN1126669A (zh) 1996-07-17
DK0704320T3 (da) 1999-08-16
DE59504405D1 (de) 1999-01-14
ES2124484T3 (es) 1999-02-01
ATE173980T1 (de) 1998-12-15
US5775977A (en) 1998-07-07
BG100034A (bg) 1996-07-31
DE4435221A1 (de) 1996-04-04
KR960010905A (ko) 1996-04-20
EP0704320B1 (fr) 1998-12-02
BR9504236A (pt) 1996-08-06
JPH08192586A (ja) 1996-07-30

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