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
  • B41N7/00—Shells for rollers of printing machines
  • B41N7/005—Coating of the composition; Moulding; Reclaiming; Finishing; Trimming
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F31/00—Inking arrangements or devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F31/00—Inking arrangements or devices
  • B41F31/002—Heating or cooling of ink or ink rollers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F31/00—Inking arrangements or devices
  • B41F31/02—Ducts, containers, supply or metering devices
  • B41F31/14—Applications of messenger or other moving transfer rollers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F31/00—Inking arrangements or devices
  • B41F31/26—Construction of inking rollers
• • 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
  • B41N7/00—Shells for rollers of printing machines
  • B41N7/04—Shells for rollers of printing machines for damping rollers
• • 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
  • B41N7/00—Shells for rollers of printing machines
  • B41N7/06—Shells for rollers of printing machines for inking rollers
• • 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
  • B41N2207/00—Location or type of the layers in shells for rollers of printing machines
  • B41N2207/02—Top layers
• • 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
  • B41N2207/00—Location or type of the layers in shells for rollers of printing machines
  • B41N2207/14—Location or type of the layers in shells for rollers of printing machines characterised by macromolecular organic compounds

Definitions

• the present application relates to a method for producing a rigid roll, a rigid roll and their use.
• Offset printing is still the dominant technology in printing processes. It is an indirect printing process that is used in newspaper, magazine, catalog and packaging printing, etc.
• a printing plate is created, typically a thin aluminum plate. This is clamped on a Plattenzyl indians and is in the printing press with dyeing and dampening in conjunction. Lipophilic areas of the printing form accept ink while hydrophilic areas remain colorless.
• the ink is transferred to the blanket mounted on a blanket cylinder or offset cylinder.
• the blanket cylinder then transfers the ink to the medium to be printed using a counter-pressure cylinder or another blanket cylinder.
• the color is applied from the reservoir via a special inking unit.
• the ink is typically transported via the stool by means of a plurality of rollers.
• rigid rollers distributed via the stool by means of a plurality of rollers.
• elastic rollers ink rollers
• the distributor rollers typically consist of a steel core with a coating of Rilsan and are therefore often referred to as Rilsanwalzen. These are usually made in the following process: The bare steel core is heated and then introduced into a bath of Rilsan powder (a special grade of polyamide) rotating. The Rilsan powder melts in contact with the hot core, ensuring a relatively uniform coating. The surface quality of the coating is far from sufficient for use in offset printing, so they z. B. must be processed via a grinding process. Disadvantages of this method are costs (expensive grinding process and removal of previously applied material) and a high layer thickness. It is costly to achieve layer thicknesses below about 100 pm. However, this is particularly desirable when working with internally cooled distributor rollers, as is the case today with many printing presses. Too thick a coating prevents effective heat transfer from the surface of the distributor roller.
• EP 0 942 833 B1 describes an inking roller in which an elastomeric coating material, for example polymeric nitrile butadiene, phenolic resin, epoxy resin, polyurethane and other materials are applied to a roller.
• an elastomeric coating material for example polymeric nitrile butadiene, phenolic resin, epoxy resin, polyurethane and other materials are applied to a roller.
• the object of the present invention was to provide processes for producing rolls and rolls, which overcomes the above-mentioned disadvantages of the prior art.
• the object is achieved by a method for producing a rigid roller comprising the steps:
• a roll core is provided in the first step.
• Typical roll cores are made of metal, especially steel and aluminum. But it may also be non-metallic roll cores, for example ceramic, glass fiber reinforced plastic (GfK) or carbon fiber reinforced plastic (CfK) act.
• GfK glass fiber reinforced plastic
• CfK carbon fiber reinforced plastic
• the roll core according to the invention is for an intemperated roll.
• InnertemperATOR rollers are rollers that can be tempered using a tempering medium.
• the tempering medium may be a liquid or tempered air. Usually, tempering is used for cooling.
• Corresponding rolls are known for example from DE 93 169 324.
• the roll core may have a roughness Rz of 0.1 to 100 ⁇ m, preferably 1 to 30 ⁇ m.
• the coating composition essentially comprises a polyimide or polyamide prepolymer.
• Starting materials for the preparation of polyimides are preferably aromatic and aliphatic diamines with aromatic tetracarboxylic dianhydrides; instead of the diamines, it is also possible to use diisocyanates.
• a polyamic acid is formed, which then further reacts to form the polyimide.
• starting materials for polyamideimides are preferably aromatic tricarboxylic anhydrides with aromatic or aliphatic diamines or diisocyanates.
• Prepolymers are understood as meaning mixtures of reactive monomers which have already partially but not completely reacted with the polymer.
• the curing reaction takes place after application to the roll core. Curing is achieved or accelerated by heating.
• a range of 1 to 1000 pm has proven to be fundamentally suitable, with a range of 10 to 200 pm, or 20 to 120 pm being preferred.
• the coating composition is used essentially on the basis of a polyimide or polyamide-imide prepolymer, it can contain further substances, in particular fillers, additives, colorants, etc.
• the coating composition preferably contains a polyimide or polyamide-imide prepolymer as the main constituent (> 50 wt .%).
• the coating composition of prepolymers contains only polyimide prepolymers.
• the coating composition contains only polyamide imide prepolymers.
• the coating composition contains both polyimide prepolymers and polyamide-imide prepolymers.
• Another embodiment is a roller in which the coating composition contains a polyimide prepolymer and, in addition, polyamides or polyamideimides are contained in the coating composition.
• the coating composition contains dissolved polyimides instead of polyimide prepolymers.
• the coating composition additionally contains polyamides or polyamide prepolymers.
• the ratio of polyimide prepolymers to polyamides + polyamide prepolymers is preferably in the ratio of 10: 0 to 10: 9.
• the coating composition may also contain dissolved polyamide-imide.
• Suitable methods for applying the liquid coating composition are, in particular, spraying, knife coating, thin-layer rotary casting or ring coating.
• the liquid coating composition solidifies by a curing process, i. E. another reaction to the polymer.
• the prepolymer contains a solvent
• the solidification is assisted by the drying / evaporation of the solvents.
• the material applied according to the invention is preferably of such a uniform, high-quality surface that grinding of the coating composition after solidification is not required.
• the roller according to the invention has excellent properties for the printing process: high wear resistance, high chemical resistance, good ink acceptance, good ink delivery and good cleanability. These properties are also a result of the uncut surface, which thus has no pores and thus is also not susceptible to deposits from the printing process.
• the invention also provides a rigid, temperature-controlled roller, which is obtainable by the process according to the invention.
• the roll according to the invention is characterized by a roll core and a solidified, preferably non-polished, polyimide-based coating located thereon in a layer thickness of 1 to 1000 ⁇ m.
• the coating of the roller according to the invention may have a modulus of elasticity in the range from 0.5 to 500 MPa.
• the roll core has a roughness Rz of 0, 1 to 100 pm, preferably 1 to 30 pm.
• the application of the coating composition can lead to a reduction of the roughness.
• the roughness of the solidified coating is less than the roughness of the roll core.
• the invention also provides a method for adjusting a predetermined roughness of the roll, in which a roll core is coated with a defined roughness to obtain a roll with a defined roughness of the coating composition.
• the roll according to the invention is suitable for internally tempered rolls and / or iridescent rolls.
• Internal tempered rolls are used to dissipate heat to the watering process to provide even pressure conditions.
• "Oscillation” means that the roller is axially reciprocated during operation (i.e., in a rotating state) so as to achieve improved uniformity of the ink film.
• the rolls with a coating based on polyimide or polyamide-imide are not only advantageous as internally tempered rolls, but also in their non-tempered form. First, their production is facilitated by the fact that a grinding of the surface is not necessary. In particular, the roughness of the coating can be adjusted by selecting the roughness of the roll core and the coating thickness.
• the subject of the invention is also the use of a rigid roll obtainable by a process comprising the steps:
• the invention furthermore relates to an inking unit comprising rigid distributor rollers and elastic rollers, wherein at least one rigid roller is a roller obtainable by a method comprising the steps:
• FIG. 1 shows an inking unit with a ductor roller 1, a lifting roller 2, distributor rollers 3, transfer rollers 4 and inking rollers 5.
• Example 2 On a steel core, a solution of polyamic acid is applied in the thin-layer rotation casting. In the rotating state, the material is heated so that a substantial proportion of the solvent evaporates. This results in the coating composition remaining stable after the end of the rotation. This is followed by a tempering of the roller at up to 250 ° C. Pressure tests with such a roller gave excellent results.
• Example 2
• Example 1 In the method according to Example 1, a steel core with a roughness Rz of 15 pm was used. In the case of a coating with a thickness of 80 ⁇ m according to Example 1, an Rz of approximately 2.2 ⁇ m remains on the surface. In the case of a coating with a layer thickness of 30 ⁇ m, an Rz of about 5 ⁇ m remains, ie. By choosing the coating thickness, the roughness of the coating can be adjusted.

Landscapes

• Rolls And Other Rotary Bodies (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Inking, Control Or Cleaning Of Printing Machines (AREA)
• Paints Or Removers (AREA)

Priority Applications (14)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (17)

Families Citing this family (2)

Citations (4)

Family Cites Families (14)

• 2010
  • 2010-12-07 JP JP2012542510A patent/JP5758910B2/ja not_active Expired - Fee Related
  • 2010-12-07 BR BR112012013770A patent/BR112012013770B1/pt active IP Right Grant
  • 2010-12-07 CA CA2783324A patent/CA2783324C/en active Active
  • 2010-12-07 EP EP10788320.9A patent/EP2509797B1/de active Active
  • 2010-12-07 PL PL10788320T patent/PL2509797T3/pl unknown
  • 2010-12-07 CN CN201080055206.4A patent/CN102686411B/zh active Active
  • 2010-12-07 AR ARP100104504A patent/AR079307A1/es active IP Right Grant
  • 2010-12-07 WO PCT/EP2010/069046 patent/WO2011069998A1/de active Application Filing
  • 2010-12-07 ES ES10788320.9T patent/ES2526255T3/es active Active
  • 2010-12-07 DK DK10788320.9T patent/DK2509797T3/en active
  • 2010-12-07 PT PT107883209T patent/PT2509797E/pt unknown
  • 2010-12-07 AU AU2010330001A patent/AU2010330001B2/en not_active Ceased
  • 2010-12-07 SI SI201030813T patent/SI2509797T1/sl unknown
  • 2010-12-07 KR KR1020127017355A patent/KR101757836B1/ko active IP Right Grant
  • 2010-12-07 US US13/514,527 patent/US9308765B2/en active Active
  • 2010-12-07 RU RU2012128529A patent/RU2612566C2/ru active
• 2012
  • 2012-11-21 HK HK12111880.6A patent/HK1170987A1/xx not_active IP Right Cessation

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