EP1266700A2 - Rouleau pour la préparation ou le traitement d'un film fluide - Google Patents

Rouleau pour la préparation ou le traitement d'un film fluide Download PDF

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Publication number
EP1266700A2
EP1266700A2 EP02012817A EP02012817A EP1266700A2 EP 1266700 A2 EP1266700 A2 EP 1266700A2 EP 02012817 A EP02012817 A EP 02012817A EP 02012817 A EP02012817 A EP 02012817A EP 1266700 A2 EP1266700 A2 EP 1266700A2
Authority
EP
European Patent Office
Prior art keywords
hardness
coating
roller
roll
layer
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.)
Granted
Application number
EP02012817A
Other languages
German (de)
English (en)
Other versions
EP1266700B1 (fr
EP1266700A3 (fr
Inventor
Achim Siebert
Thomas Rosemann
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.)
WEROS Tech GmbH
Original Assignee
Westland Gummiwerke GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Westland Gummiwerke GmbH and Co filed Critical Westland Gummiwerke GmbH and Co
Publication of EP1266700A2 publication Critical patent/EP1266700A2/fr
Publication of EP1266700A3 publication Critical patent/EP1266700A3/fr
Application granted granted Critical
Publication of EP1266700B1 publication Critical patent/EP1266700B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/193—Transfer cylinders; Offset cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0808—Details thereof, e.g. surface characteristics
    • 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
    • B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
    • B41N10/02—Blanket structure
    • B41N10/04—Blanket structure multi-layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • 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
    • B41N2207/04—Intermediate 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
    • 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
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49544—Roller making
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49544—Roller making
    • Y10T29/4956—Fabricating and shaping roller work contacting surface element
    • Y10T29/49563—Fabricating and shaping roller work contacting surface element with coating or casting about a core

Definitions

  • the invention relates to a roller for fluid film processing or processing with a roller coating of the layer thickness d with a first layer surrounding the core with a first hardness and a second layer which is the first layer immediately radially outside and a second hardness which is different from the hardness of the first layer.
  • a generic roller for color processing is for example known from DE-OS 24 33 749.
  • By building out at least two layers can both be chemical the roll surface, for example affinity determined to a print medium, as well as other properties the roller like the adherence of the outer layer to the im essential rigid roll core, or the mechanical properties the roller coating such as its hardness can be set.
  • US Pat. No. 5,257,967 discloses an inking roller with a core on which two layers of elastomeric materials of different hardness are applied. This is to achieve a more even application of paint.
  • ink transfer rollers of this type have been known for a long time, the problem often arises that printing machines which transfer liquid films with elastomer-coated rollers produce inhomogeneities in the ink application to the respective printed product.
  • the formation of undesired microstrips is known under the term "ribbing". These microstrips often appear at a distance of a few millimeters from one another and can be seen both on the printed product and on the ink transfer rollers.
  • the invention has for its object a roller for Fluid film preparation or processing, especially for the Offset printing, to create by means of which inhomoginities of the Print medium or printed product, in particular microstrips on the printed product, at least largely avoided can be found in the nature of the coating surfaces the particular requirements are easily adaptable and can be manufactured inexpensively.
  • this task is performed by a roller for the Fluid film processing or processing solved, in which the roller coating at least in some areas has a substantial continuous gradient of hardness over part of the layer thickness d of the roller coating can be present.
  • the roller coating at least in some areas has a substantial continuous gradient of hardness over part of the layer thickness d of the roller coating can be present.
  • the Hardness gradient of the roller according to the invention can, for example are essentially linear or essentially exponential, however, other suitable hardness gradients, which also with intermediate maxima or plateaus essentially constant hardness over a range of the course of the layer thickness can be set.
  • the layers of different hardness of the invention Rollers preferably each have the same base material or largely agree in their composition.
  • the layers preferably differ only in that Proportion of the hardness-changing substance or a precursor of the same or in a property with the measure of a introduced hardness-changing substance or agent correlated, for example in the degree of crosslinking.
  • a gradient of the degree of crosslinking a gradient of heat or radiation intensity or a gradient an activator or photoinitiator. Because the layers of different hardness the same Basic component or a substantially identical composition can also have the roller coatings particularly simple and binding errors or adhesion problems between layers of different compositions are largely avoided.
  • the material forming the layer of low hardness in particular the coating base material applied to the core which can represent roller coating, preferably has a hardness of less than 35 Shore A, e.g. less than 30 Shore A, preferably in the range from 25 to 10 Shore A, particularly preferably in the range from 25 to 20 Shore A without to be limited to this.
  • a roll coating in which Range of hardness change over a layer thickness increment of 10 micron differences in the intrinsic hardness of the coating material in the range of maximum 5 Shore A, in particular 2-3 Shore A (hardness gradient 80 Shore A over layer thickness 0.5mm: 1.6 Shore A to 10 microns) to 0.02-0.04 Shore A (hardness drop 35 ShA over 2mm: 0.07 Shore A to 10 Micrometer), preferably in the range of 1 - 0.1 Shore A, particularly preferably in the range from less than 0.2 to 0.8 Shore A, in particular in the range of 0.4 Shore A.
  • These hardness gradients are preferably over essentially the total coating thickness with a hardness gradient the roller complied with.
  • the above-mentioned hardness gradients can be estimated by microhardness determinations or by removing the roller coating, e.g. through continuous wedge-shaped grinding of the roller coating, and determination the total hardness of the remaining roll coating, whereby to the intrinsic hardness of a layer thickness increment can be inferred.
  • the hardness gradient of the rolls according to the invention can be determined by the superficially measured hardness depending on the layer thickness which characterizes a layer having a hardness gradient become.
  • the layer thickness can be incremental Layer thickness removal can be varied, for example by continuously changing the hardness coating as a wedge is cut down.
  • an effective profile Hardness can be determined.
  • the hardness can be determined by common Hardness measurement methods such as IRHD (DIN 53 519 sheet 1), IRHD soft (DIN 53 519 sheet 1), IRHD micro (DIN 53 515 Sheet 2), as Shore A hardness (DIN 53 505) or as Shore D hardness (DIN 53 505) can be determined. It should be noted here that the hardness measurement due to the roller according to the invention of the continuous hardness gradient is not a standard Hardness determination according to the aforementioned DIN standards and only reflects an effective (medium) hardness.
  • the hardness gradient is characterized by the above described method particularly possible if the Hardness gradient of the roller according to the invention only over part the layer thickness of the roll coating and the Roller coating over the entire hardness-changed area except for the basic hardness of the roller coating is removed.
  • the hardness gradient is preferably a layer thickness increment of 10 microns, i.e. H. when determining hardness a given roll layer thickness and based on a coating removal of 10 micrometers (real removal or arithmetical Reference value, the hardness gradient then essentially linear sen), with a difference in hardness of 1 to 0.02 Shore A, preferably 0.5 to 0.05 Shore A, especially preferably 0.2 to 0.1 Shore A, in particular approximately 0.015 Shore A. It goes without saying that when determining hardness for larger ones Differences in layer thickness are proportionately greater differences in hardness be measured.
  • So rolls according to the invention have a layer thickness of 100 micrometers (corresponding to a Layer thickness removal of 100 micrometers) preferably differences in hardness from 10 to 0.2 Shore A, particularly preferably 5 to 0.5 Shore A, especially in the range from 1 to 2 Shore A.
  • Rolls according to the invention can be essentially continuous Hardness gradients or changes in hardness via a difference of intrinsic hardness, the difference in hardness arising from the Difference in hardness of the hardness-changed roller surface and the unchanged base material can be greater than or equal to 5 Shore A, the difference in hardness can easily be larger 100 Shore A, for example up to 50 Shore D, or Furthermore.
  • Particularly suitable for certain applications are those from 50 to 70 Shore A.
  • the effective hardness defined above resulting from the determination of the respective hardness of the roll coating at a given point in the depth profile without Taking into account the existing hardness gradient in the case of rollers according to the invention, preferably essentially one continuous gradient of the effective hardness over a Hardness difference of 5 Shore A or greater, for example 10 - 50 Shore A, preferably less than 40 Shore A and less as 80 IRHD micro, particularly preferably between 10 and 20 Shore A and 20 to 50 IRHD micro before, being for certain uses also larger or smaller hardenings set can be.
  • the difference in hardness can increase in particular the surface hardness of the roller compared to the hardness of the unchanged basic material.
  • the second, radially outer layer of the roller coating preferably a higher hardness than the first, radial inside and adjacent to the roll core, so that the hardness in the radial direction from the outside in decreases.
  • the second layer can have a higher degree of crosslinking than the first layer.
  • the hardest layer of the coating area with essentially continuous Hardness gradients that have the highest degree of crosslinking Roll coating can preferably be the most furthest radially outer layer of the coating, see above that the hardness gradient starts from the radially outer roller surface radially inwards into the roller material stretches and the hardness from the outside in continuously decreases, but there may be an outer cover layer (see below).
  • the hardest layer of the coating area with essentially continuous hardness gradient is preferably at the same time the hardest layer of the depth profile of the roll coating, where the hardness of the layers still has an impact on the surface hardness of the roll coating, which for example by the wedge-shaped one mentioned above Shift removal or other suitable measures can be determined is.
  • the hardest layer of the coating area with essentially continuous hardness gradient is preferred at the same time the hardest layer, that of the inner and / or outer Roll coating surface or the radially outer Roll surface is facing.
  • the "hardest” layer the hardness gradient is preferably the hardest layer based on a layer thickness of the roll coating of up to 0.1 mm, up to 0.5 mm, up to 1 mm, up to 2 mm or up 5 mm of the roller coating starting from the coating surface, e.g. the roller surface, if necessary also up to to a depth of up to 10 mm or up to 30 mm Roller coating, without being limited to this.
  • the information "Hardest layer” thus preferably refers to near-surface Layers of the roller coating.
  • High hardness elastomer layer adjacent to the roll core be provided in the given roll coating no or only an insignificant influence on the Has surface hardness of the roller coating without the concept leave the invention, but usually the layers lying radially further inward unchanged hardness Coating coating material will represent.
  • the toughest Layer of the layer area with essentially continuous Hardness gradients can therefore also be the hardest layer of the Represent roll coating, especially based on the intrinsic hardness, except possibly the connection area the coating with the core.
  • the hardest layer of the roll coating area with im essential continuous hardness gradient can be at a distance of about 100 or 50 Microns or less, especially about 20 microns or less, about 10 microns or less, preferably about 5 microns or less, or about 1 micron or less from the inner and / or outer roll coating surface be distant.
  • the inner roll coating surface is facing the roller core, the outer coating surface also represents the roller surface.
  • This Layer can also have the highest degree of crosslinking in the have considered layer thickness increment.
  • This layer can measure the hardness up to the roller surface run essentially constant or against the hardness maximum descend towards the surface, the descent preferably less than 20%, less than 10%, or preferably less than 5% each based on the absolute (intrinsic) hardness of the hardest layer (e.g. Shore A hardness) of the surface Coating area, each based on the effective hardness or in each case based on the hardening compared to the hardness unchanged roller base material can be without to be limited to this.
  • a drop in coating hardness to the roll surface for example, by Methods of hardness change may be necessary, e.g. when a hardness-changing cross-linking agent on the roller surface Side reactions are received, which are less or none Change in hardness, or if for surface modification Fabrics such as Plasticizers are applied.
  • the change in hardness in the area of the continuous hardness gradient preferably goes with a corresponding change in Degree of networking.
  • a second layer of higher hardness preferably has a higher degree of crosslinking than that radially inner first layer, the radially farthest the hardest layer on the outside preferably has the highest degree of networking.
  • the hardest or highest cross-linked incremental layer in the area of the roller surface preferably has at least a residual elongation at break 50%, preferably from at least 70%.
  • the softest layer a hardness gradient preferably has the lowest Degree of crosslinking.
  • the hardness gradient as an essentially linear drop in hardness or Hardness increase can essentially be continuous over a radial layer thickness of more than 0.01 mm, more than 0.05 mm or extend more than 0.1 mm to 30 mm or more.
  • the hardness-changed area can in particular layer thicknesses in the Range of 0.2 or 0.3 to 10 mm, for example in the range from 0.5 mm or 1 to 2 or to 5 mm.
  • On the hardness-changed area can be another in the radial direction hardness-changed area, if necessary separated by a Liner, or unchanged base material of the follow roller coating.
  • the method is preferably carried out such that only there is a superficial change in the hardness of the roller coating, i.e. is the layer thickness of the hardness-changed area less than the layer thickness of the unchanged base material.
  • the layer thickness ratio of the coating material with practically constant hardness over the layer thickness to the Layer thickness of the area with essentially continuous Hardness gradients can range from 2: 1 to 30: 1 or greater amount without being limited to this, preferably in Range of 4: 1 or greater, particularly preferably in the range of 6: 1 to 15: 1.
  • the total layer thickness of the elastomeric roller coating can range from 4 to 20 mm without to be limited to this, preferably in the range of 6-13 mm.
  • the areas with constant hardness and with hardness gradient preferably close immediately in the radial direction to each other.
  • the setting of continuous hardness gradients according to the invention is particularly suitable for roller coatings made of elastomer Base materials, especially for cross-linkable elastomers Base materials, advantageously, the base materials thermoplastic, but in particular only partially or may not have thermoplastic properties.
  • the Basic components can for example be made of synthetic or natural rubber (NR), halogenated rubber such as Polychloroprene, polyurethane, butadiene rubber (BR), nitrile butadiene rubber (NBR), partially or fully hydrogenated Nitrile butadiene rubber (HNBR), acrylate rubber (EAM), chlorosulfonic acid rubber (CSM), styrene butadiene rubber (SBR), Ethylene propylene rubber (EPDM), PVC, fluororubber (FPM), Silicone rubber (Q) or ethylene-vinyl acetate copolymer exist or have one or more of these components.
  • NR synthetic or natural rubber
  • halogenated rubber such as Polychloroprene, polyurethane, butadiene rubber (BR), nitrile butadiene rubber (NBR), partially or fully hydrogenated Nitrile butadiene rubber (HNBR), acrylate rubber (EAM), chlorosulfonic acid rubber (CSM), st
  • the hardness gradient is preferably determined by a gradient a component of the roll coating produced by the Basic component is different.
  • one or several hardness-changing auxiliary substances from the group such as hardeners, Crosslinking agents, activators, photoinitiators and Plasticizers or other low molecular weight compounds or Precursers of the components mentioned are used, the cause a hardness gradient in the roller coating.
  • the hardness-changing substances can be due to each their intrinsic properties or after appropriate implementation or reaction with another substance has a hardness gradient produce.
  • the a gradient of the degree of crosslinking of a component of the Coating composition in particular the basic component, can generate, with suitable process conditions the course of the corresponding crosslinking reaction in one sufficient scope is allowed. You can do this, for example the substances mentioned with a gradient in the coating material be introduced or otherwise a gradient of the substances are generated, followed by A suitable implementation of the auxiliary substances is initiated. In this way, rolls can be produced in a simple manner, in which at least over a range of the roll layer thickness there is a gradient of hardness.
  • the generation of the hardness gradient is not due to the above Limited fabrics.
  • An essentially continuous one Hardness gradient can also be generated, for example, by that with different basic components together bordering layers a gradient of at least one of the basic components is present.
  • the content of monomers or oligomers of a polymer Material for example a material from which the elastic deformable outer area of the roller at least partially is built up, vary over the layer thickness.
  • the Monomore or oligomers can be those of the abovementioned polymers for Production of the roller coating, without being limited to this to be. If necessary, other suitable ones low molecular weight substances are used for this.
  • the hardness gradient are generated by components such as fillers, or by other suitable substances that are compatible with the Roller meter are compatible and preferably a permanent one Allow generation of a hardness gradient.
  • hardness gradients for the formation of hardness gradients according to the invention also other hardness influencing media such as Heat and / or radiation in this way with the roller coating can interact with that an essentially continuous gradient of hardness results, for example by activating crosslinking agents, generation suitable activators or the like.
  • radiation can be light or particle radiation such as electron beams or other suitable radiation can be understood.
  • Warmth and / or Suitable radiation can also be pulsed with the roller coating to be interacted to change hardness Trigger processes within the roll coating, for example to change the degree of crosslinking of the elastomer component.
  • the one activated by heat and / or radiation or reacted material can then be evenly Distribution available.
  • a hardness-changing material and / or a precursor of the same by diffusion or migration of the Material from the outside in the roller material, for example that Coating material applied to a core Roll coating, introduced, the hardness changing Substance indirectly or directly, for example through downstream Reactions with components of the roller coating, creates a hardness gradient.
  • the hardness-changing substance in the intended Operating conditions of the roller sufficient low diffusion coefficient, so that over the lifetime the roller one essentially in time and place constant hardness gradient is present.
  • the hardness changing material can be immobilized in the roller material after its introduction be, for example by subsequent chemical Reactions or by temporarily supporting the intrusion into the roll material e.g. through compared to the intended Operating conditions at elevated temperature the generation of the hardness gradient or by the presence of a suitable solvent for the diffusing substance, wherein the solvent is preferably different from the solvents used in the application of the roller, e.g. in Solvents contained in print media.
  • a crosslinking agent such as one Peroxides are promoted by acetone.
  • Crosslinking agents such as halogen and / or sulfur-containing Roller coatings containing substances in rubber compounds respectively.
  • the crosslinking agents can be Solutions or via the gas phase in the coating material be introduced.
  • a rubber material containing roller coating by introducing Chlorosulfur or other sulfur halides or poly sulfur halides by means of toluene solution or by gas phase chlorination surface hardened.
  • too rubbing in sulfur or sulfur compounds and / or solid phase vulcanization accelerators for example in the form of powders.
  • It is particularly advantageous es, radical reacting monomers, peroxides and / or photoinitiators or precursor of the compound classes mentioned diffuse into the coating material from the surface allow.
  • the above process steps can at the same time or upstream and / or downstream further related to the first step Process step follow, for example the application of Coating material with heat and / or with radiation in order for example, a corresponding crosslinking of the coating material to effect.
  • the gradient of the hardness-changing material can also be im substantial continuous change in the composition of the generated on a core coating material to be applied be, for example by immersion or spray coatings the composition of the coating material essentially changed continuously or quasi-continuously becomes.
  • the change in hardness of the roller coating can be caused by a change in hardness the coated roller, in which an elastomer Roll coating on an essentially rigid core is applied.
  • the roller coating exists preferably made of a homogeneous material.
  • the coating can be through an adhesive layer with the core be connected.
  • a hardness gradient is introduced, after which the roller coating is applied to the core becomes. If necessary, the following can be added to the two above Process variants a further structure of the roller coating, if necessary with hardness changing or Process steps generating hardness gradients take place.
  • the hardness-changed area can optionally be marked with a or several additional cover layers can be provided, for example the affinity of the roll surface for the processing medium such as. set a print medium, for example in the form of hydrophilic or oleophilic components such as e.g. Plasticizers, or desired chemical or physical Have properties, e.g. reduce abrasion.
  • the Cover layer can only have one or a few molecular layers comprise and a strength in the range of 10 to 1 or less Have micrometers without being limited to this.
  • Intermediate layers may be provided. These intermediate layers can have an effect of diffusion barriers with respect to that Coating material of hardness-changing substances or have media or none or none in this regard show significant impact.
  • the above surface modifiers Fabrics at the same time due to the hardness changing material on the Roll surface immobilized, for example by chemical Binding, especially through radical networking, with the elastomeric coating material.
  • the surface-modifying Fabrics e.g. a surfactant or emulsifier immediately before or after, preferably together with, the hardness changing material, e.g. a crosslinking agent such as for example a peroxide, applied to the roller coating and be connected to it.
  • the surface modifier Substance can be more than 5%, preferably more than 10-25%, particularly preferably approx. 50% based on the solvent-free, hardness-changing and Mixture containing surface-modifying substance, if appropriate among other components.
  • Plasticizers have become fatty alcohol derivatives, e.g. fatty alcohol polyglycol ethers, proven to be particularly suitable.
  • the treatment conditions the roller are preferably chosen so that both the hardness changing material with the elastomer Coating material as well as the surface-modifying React substance with this.
  • the hardness gradient is preferably generated after Vulcanization of the elastomeric roller coating, after a optionally carried out surface treatment and / or after the dimensioning of those with a hardness gradient Roll layer, e.g. by removing material such as grinding or other suitable calibration measures. Preferably done the generation of the hardness gradient on an otherwise usable roller. If necessary, another one Sequence of processing steps can be carried out.
  • the radially inner surface layer of the roller coating can be used, for example, with a prefabricated roller coating are generated, the modified according to the invention Coating is subsequently applied to the roll core, for example, by widening and winding up to the core.
  • the roll core can each consist of a substantially rigid Material such as steel or another suitable Material.
  • the roll coating with essentially continuous Hardness gradients preferably extend over the entire circumference and over the entire length of the fluid film processing work area the roller.
  • the area of roller coating with A hardness gradient may also only apply in certain areas over part of the roll surface, i.e. a part extend the length and / or the circumference of the roller, for example only over certain segments of the roll surface, the remaining surface areas of the roller none May have hardness gradients.
  • a Roller segment with hardness gradient only in the middle area of the Roller are provided and e.g. in the middle of the roller over 50% or 75% of the length of the roll.
  • a narrow edge strip of the roller coating adjacent the front ends of the roller without Hardness gradients can be provided, each one for example May have a width of 10%, 5% or less of the roll length.
  • the segments mentioned can each be comprehensive or extend only partially around the roller.
  • the Roller surface can also different areas or segments Hardness gradients can, for example, in the A larger or adjacent edge strips smaller hardness gradient than in the middle area of the Roll what, for example, by different amounts of in the hardness-changing substances introduced into the roller coating such as. Crosslinking agents can be achieved.
  • the segments different hardness or unchanged compared to the base material Hardness can be produced for example by this the roller surface with a material such as e.g. a film or wax is covered and the hardness changing Fabric, e.g. a peroxide, then on the roller surface is applied, or in any other suitable manner.
  • the roller according to the invention can generally be used for processing fluid films are used, especially for color film preparation and / or for the treatment of dampening solution films, without to be limited to this. Deratige color or dampening solution films are handled, for example, in printing units.
  • rollers according to the invention can also be used for processing of fluid films advantageous in other fields of application be used.
  • the rollers according to the invention can be in Machines are used in which they are against other rollers work and radial or tangential compressive forces with them change.
  • Figure 1 shows a roller 1 according to the invention consisting of a Roll core 3 made of a substantially rigid material such as Steel and an elastomeric coating 2, here from one synthetic rubber material. Between roll core 3 and roll coating 2 is an adhesion promoter layer, not shown intended.
  • the roller coating 2 with the layer thickness d 10 mm and a hardness of approx. 25 Shore A was in a process step applied to the roll core.
  • the roller coating which can be used in particular in the inking unit as well as in the dampening unit of a printing unit, contains the following components: Nitrile rubber (50 Mooney, 33% by weight acrylonitrile) 100 parts by weight zinc oxide 5 parts by weight stearic acid 1 part by weight Filler (FEF carbon black) 20 parts by weight Plasticizer (dioctyl phthalate) 70 parts by weight Crosslinking agent (sulfur) 3 parts by weight Vulcanization accelerator (mercaptobenzothiazole) 1.5 parts by weight
  • the components of the roll coating are made in a conventional manner Mixer mixed, calendered and wrapped on the roller core prepared with an adhesion promoter. Then vulcanization is carried out in the usual way, for example in an autoclave at 150 ° C for four hours. It is then processed using conventional machining methods such as Grind the single-layer roller with a homogeneous roller coating adjusted to the required dimensions.
  • a peroxide for example t-butyl peroxybenzoate
  • a suitable concentration for example 50 to 40 ml / m 2 , preferably 100 to 300, in particular approximately 250 ml / m 2 , the The roller can rotate at a suitable speed.
  • the liquid peroxide is then allowed to diffuse into the elastomeric covering for a period of approximately 5 minutes to 2 hours, for example approximately 30 minutes, which is sufficient to produce the desired hardness gradient, and after this diffusion time is immediately brought thermally to a sufficient reaction temperature by means of a heating device which reacts the peroxide with the rubber component while hardening the same, and kept at this temperature for a sufficient reaction time, for example about 1 hour.
  • the depth profile of the hardness (Shore A hardness) of the roll obtained in this way is shown schematically in FIG. 2.
  • the roller coating has a region of the layer thickness d v with an essentially continuous gradient of hardness, the harder region directly adjoining the outer circumference of the roller coating.
  • the hardness gradient is essentially exponential here.
  • the outermost layer of the roller coating has an intrinsic hardness of approx. 85 Shore A. Over a radial depth of approx. 1 mm, the hardness has dropped to that of the unchanged roller coating, here approx. 25 Shore A. There are thus layers A and B surrounding the core 3 of different hardness, the second layer B, which surrounds the first layer A radially on the outside, having a higher hardness.
  • a hardness gradient of approximately 0.6 Shore A / 10 microns is thus present over the surface-hardened layer of layer thickness d v .
  • the measured surface hardness of the roll which shows the influence of the hardness gradient, is approximately 47 Shore A. Starting from the surface-hardened layer to the roll core, the hardness is essentially unchanged.
  • surface hardening of the elastomer Coating of the roller can also be produced in that a Sulfur monochloride solution of suitable concentration, for example approx. 2.5% by weight in a suitable solvent such as Diethyl ether on the roller coating, for example the Can have the composition described above, applied and for a sufficient period of time with a sufficient Temperature (for example 80 ° C / 30 minutes) is annealed.
  • a sufficient Temperature for example 80 ° C / 30 minutes
  • a roller coating can be achieved in that a Mixture of a vulcanizing agent with a vulcanization accelerator, (for example a mixture of sulfur with diphenylguanidine) in a suitable mixing ratio (for example in a mixing ratio of 3: 1) in a nip for a suitable period of for example 5 minutes to 2 hours, preferably about 30 Minutes into the roll surface of the roll to be modified is rubbed. Subsequently, an annealing at a sufficient time for a sufficient period of time (e.g. approx. 1 hour at 150 ° C). It understands yourself that the above hardening agents also through other mechanical processes introduced into the roll coating can be.
  • a vulcanizing agent with a vulcanization accelerator for example a mixture of sulfur with diphenylguanidine
  • a suitable mixing ratio for example in a mixing ratio of 3: 1:
  • the surface hardening agents can be used together with a Wetting properties optimizing agent, especially one hydrophilizing or oleophilizing agent such as e.g. a hydrophilizing fatty alcohol derivative, for example a fatty alcohol polyglycol ether, or an oleophilic oligomeric liquid EPDM applied to the roller surface be so that simultaneously with the hardness modification or in the wetting ability in a subsequent process step the roll surface can be changed, for example the Water wettability can be improved.
  • the Wetting agent is preferably applied at a time Roll coating applied to which this still with the surface hardening crosslinking agent, for example the Peroxide, bound radically to the elastomer surface can.
  • FIG. 3 shows a modification of a depth profile of the roller according to FIG. 1.2, the layer of highest hardness close to the surface being provided at a distance of approximately 5 micrometers from the roller surface and the drop in hardness towards the roller surface accounting for approximately 5% of the absolute hardness of the layer of maximum hardening , for example due to a surface decomposition or side reaction of the crosslinking agent applied for hardening.
  • the hardness drops continuously down to a layer depth of the coating of approximately 100 micrometers.
  • the layer S H has the highest hardness down to a depth of the coating of 10 mm, preferably over the entire thickness of the coating. Otherwise, the explanations for FIGS. 1 and 2 apply accordingly.
  • FIG. 4 shows a modification of a roller 1 according to the invention consisting of a roll core 3, the same components with are provided with the same reference numbers.
  • the hardness profiles of the Coatings are shown in Figures 5 and 6.
  • the layer thickness d 0 refers on the inner coating surface, which is modified here becomes.
  • the roller coating was art prefabricated of a hose, the inner surface of the Coating facing the core 3 as in the figures 1-3 superficially hardened and with an adhesion promoter provided roll core.
  • the generation of the The hardness gradient according to FIG. 5 corresponds to the explanations given Figure 2, according to Figure 6, the explanations of Figure 3.
  • the modification of the inner coating surface can Coating especially with regard to the connection with the Core, especially taking into account the necessary Heat dissipation to the core and the mechanical stability of the inner coating surface, for thin roller coatings but also regarding the properties of the exterior Coating surface, through the appropriate choice of Coating parameters and under suitable conditions Quality of fluid preparation and processing and thus also that of the printed products can be improved become.
  • the inventive method is used in all exemplary embodiments Hardness gradient thus through a microscopically homogeneous in the Roll coating distributed material or means different from Fillers or fibers.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolls And Other Rotary Bodies (AREA)
EP02012817A 2001-06-16 2002-06-10 Rouleau pour la préparation ou le traitement d'un film fluide Expired - Fee Related EP1266700B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10129107 2001-06-16
DE10129107A DE10129107C2 (de) 2001-06-16 2001-06-16 Walze für Fluidfilmaufbereitung oder Verarbeitung

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EP1266700A2 true EP1266700A2 (fr) 2002-12-18
EP1266700A3 EP1266700A3 (fr) 2006-01-04
EP1266700B1 EP1266700B1 (fr) 2009-01-21

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DE102004049514B4 (de) * 2004-10-11 2009-07-09 Koenig & Bauer Aktiengesellschaft Druckeinheit mit wenigstens einem Formzylinder und wenigstens einer Farbauftragswalze
DE102004054425A1 (de) 2004-11-10 2006-05-18 Weros Dienstleistungen Gmbh Feuchtmittel- und/oder Verdruckmittelübertragungseinrichtung für Druckmaschinen
US7517202B2 (en) * 2005-01-12 2009-04-14 Smith International, Inc. Multiple elastomer layer progressing cavity stators
DE102007053270B4 (de) * 2006-12-01 2014-09-11 Heidelberger Druckmaschinen Ag Druckmaschine
DE102007057250B4 (de) 2007-01-27 2010-12-16 Manroland Ag Auftragsvorrichtung für ein Druck-/Lackwerk in einer Verarbeitungsmaschine
DE102007059335A1 (de) * 2007-12-07 2009-06-10 Manroland Ag Auftragsvorrichtung mit einem Formzylinder und wenigstens einer Auftragwalze in einer Verarbeitungsmaschine
DE102009012149A1 (de) 2009-03-06 2010-09-09 Heidelberger Druckmaschinen Ag Druckmaschine
JP5321316B2 (ja) * 2009-07-24 2013-10-23 コニカミノルタ株式会社 用紙加湿装置、用紙後処理装置及び画像形成システム
JP4777479B2 (ja) * 2010-01-05 2011-09-21 キヤノン株式会社 定着部材、定着部材の製造方法、および定着装置
US9393648B2 (en) 2010-03-30 2016-07-19 Smith International Inc. Undercut stator for a positive displacment motor
ES2666591B1 (es) * 2016-11-02 2018-11-30 Rotecna, S.A. Perfeccionamientos en las máquinas para el tratamiento de purines
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Also Published As

Publication number Publication date
US20030078147A1 (en) 2003-04-24
EP1266700B1 (fr) 2009-01-21
DE10129107C2 (de) 2003-08-14
DE10129107A1 (de) 2003-01-09
EP1266700A3 (fr) 2006-01-04
DE50213226D1 (de) 2009-03-12
US6935995B2 (en) 2005-08-30

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