EP1614006A2 - Procede de production d'elements pour impression flexographique cylindriques photopolymerisables, sans soudure continue, et utilisation de ce procede pour la production de formes pour flexographie - Google Patents

Procede de production d'elements pour impression flexographique cylindriques photopolymerisables, sans soudure continue, et utilisation de ce procede pour la production de formes pour flexographie

Info

Publication number
EP1614006A2
EP1614006A2 EP04727243A EP04727243A EP1614006A2 EP 1614006 A2 EP1614006 A2 EP 1614006A2 EP 04727243 A EP04727243 A EP 04727243A EP 04727243 A EP04727243 A EP 04727243A EP 1614006 A2 EP1614006 A2 EP 1614006A2
Authority
EP
European Patent Office
Prior art keywords
layer
photopolymerizable
flexographic printing
cylindrical
cylinder
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.)
Withdrawn
Application number
EP04727243A
Other languages
German (de)
English (en)
Inventor
Uwe Krauss
Udo Metzmann
Jens Schadebrodt
Margit Hiller
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.)
Flint Group Germany GmbH
Original Assignee
XSYS Print Solutions Deutschland GmbH
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 XSYS Print Solutions Deutschland GmbH filed Critical XSYS Print Solutions Deutschland GmbH
Publication of EP1614006A2 publication Critical patent/EP1614006A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/16—Curved printing plates, especially cylinders
    • B41N1/22—Curved printing plates, especially cylinders made of other substances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/18—Curved printing formes or printing cylinders
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/16—Coating processes; Apparatus therefor
    • G03F7/18—Coating curved surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor

Definitions

  • the invention relates to a method for producing photopolymerizable cylindrical, endlessly seamless flexographic printing elements by applying a layer of a photopolymerizable material to the outer surface of a hollow cylinder and connecting the edges by calendering.
  • the invention further relates to the use of flexographic printing elements produced in this way for producing flexographic printing plates.
  • Cylindrical flexographic printing plates are known in principle.
  • the printing cylinder of the printing press is provided with a printing layer or a printing relief in its entirety.
  • Cylindrical printing forms are of great importance for the printing of endless mustem and are used, for example, for printing wallpaper, decorative paper or gift paper.
  • SIeeves is a cylindrical hollow body - also known as a sleeve - which has been provided with a print layer or a print relief.
  • the sleeve technology enables the printing form to be changed very quickly and easily.
  • the inner diameter of the SIeeves corresponds to the outer diameter of the printing cylinder, so that the SIeeves can easily be pushed over the printing cylinder of the printing press.
  • the SIeeves are pushed on and off according to the air cushion principle:
  • the printing press is equipped with a special pressure cylinder, a so-called air cylinder.
  • the air cylinder has a compressed air connection on the front side with which compressed air can be directed into the interior of the cylinder. From there it can exit again through holes arranged on the outside of the cylinder.
  • compressed air is introduced into the air cylinder and exits at the outlet holes.
  • the sleeve can now be pushed onto the air cylinder because it expands slightly under the influence of the air cushion and the air cushion significantly reduces friction.
  • the stretching is reduced and the sleeve is stuck on the surface of the air cylinder. Further details on the sleeve technique are disclosed, for example, in "Technique of Flexographic Printing", p. 73 ff., Coating Verlag, St. Gallen, 1999.
  • the printing cylinder or a sleeve with a completely enveloping, relief-forming, photopolymerizable layer by means of suitable techniques. This can be done, for example, by coating from solution or by ring extrusion. However, both techniques are extremely complex and therefore correspondingly expensive. It is therefore widespread to wrap the printing cylinder or the sleeve with a prefabricated, thermoplastic processable layer of photopolymerizable material and to seal the abutting edges of the photopolymerizable layer, also called seam, as well as possible using suitable techniques. Only in a second step is the cylindrical photopolymerizable flexographic printing element processed into the finished round printing form. Devices for processing cylindrical flexographic printing elements are commercially available.
  • the thickness tolerance should normally not be more than ⁇ 10 ⁇ m. If the thickness tolerance of the photopolymerizable layer of the seal is not sufficient, the surface of the seal must be reworked.
  • DE-A 31 25 564 and EP-A 469375 disclose methods for improving the print quality, in which one first grinds the surface of the cylindrical flexographic printing element, then smoothes it with a suitable solvent and, if necessary, fills in any unevenness with binder or the material of the light-sensitive layer. Such an approach is of course extremely complex, lengthy and expensive.
  • photopolymerizable, cylindrical flexographic printing elements can be produced by applying a layer of photopolymerizable material to a sleeve so that the cut edges meet and then heated to approx. 160 ° C. until the material begins to melt and the cut edges interlock run.
  • DE-A 29 11 980 discloses a method in which a printing cylinder is wrapped with a photosensitive resin film without a substantial distance or a substantial overlap between the plate ends.
  • the seam is closed by bringing the pressure cylinder into contact with a calendering roller while rotating, and connecting the cut edges to one another by melting.
  • No. 5,916,403 proposes an elaborately constructed apparatus with which a sleeve can be coated with molten photopolymer material and the layer can be calendered.
  • Plate-shaped polymer material in molten or solid form can also be used to coat the sleeve. If a plate-shaped material is used, either a gap is left between the ends, which must be closed by calendering at elevated temperatures, or the ends overlap and the supernatant must also be smoothed by calendering.
  • the so-called back-side pre-exposure represents a further problem of sleeve technology.
  • Flexographic printing elements are usually pre-exposed from the back through the carrier film for a short period of time before the main exposure is actually carried out.
  • the relief substrate is prepolymerized and a better socketing, in particular of fine relief elements, is achieved in the relief substrate.
  • DE-A 3704694 has therefore proposed to first apply a first layer of photopolymer material to a sleeve, to weld the seam, and then to polymerize the photopolymer layer from the front by exposure.
  • a photopolymer layer is applied to the first, already cross-linked layer and its seam is also welded.
  • this two-step process is very cumbersome and expensive.
  • the object of the invention was to provide an improved process for the production of cylindrical, endlessly seamless, photopolymerizable flexographic printing elements, which ensures a better closure of the seam than in the known technologies and also a very good concentricity. Pre-exposure to the back should be possible in a simple manner without impairing satisfactory closure of the seam. Furthermore, reworking of the flexographic printing element by grinding and smoothing should be avoided, and the process should be able to be carried out as quickly as possible. In addition, it should be possible to reuse the used sleeve without great effort.
  • a method for producing photopolymerizable cylindrical, seamless seamless flexographic printing elements by applying a layer of a photopolymerizable material comprising at least one elastomeric binder, ethylenically unsaturated monomers and a photoinitiator, on the outer surface of a hollow cylinder and connecting the layer ends by calendering found, the method comprising the following steps: (a) providing a layer composite comprising at least one layer made of a photopolymerizable material and a carrier film which can be peeled off the layer,
  • the adhesive layer is a double-sided adhesive tape.
  • cylindrical seamless seamless photopolymerizable flexographic elements have been found which can be obtained by the described process, and their use for the production of flexographic forms using laser engraving or digital imaging.
  • the method according to the invention enables cylindrical, endlessly seamless, photopolymerizable flexographic printing elements to be obtained in a surprisingly simple manner in high quality. A very good seam closure is achieved. Reworking of the flexographic printing element obtained through complex grinding and smoothing processes its unneccessary. It is possible to pre-expose the back of the flexographic printing element, even without the use of a transparent sleeve. It was also particularly surprising and unexpected for the person skilled in the art that a durable and high-quality seam closure is still possible by means of the method according to the invention, despite the back exposure. Using the method according to the invention, ready-to-use flexographic printing elements can be produced from the starting materials within no more than 1 h.
  • Fig. 1 Cross-section through a flexographic printing element prepared for calendering, in which the edges to be connected are cut to size using a miter cut and placed one above the other (schematically).
  • Fig. 2 cross section through the preferred apparatus for performing the method according to the invention (schematic).
  • a layer composite is first provided in step (a), which comprises at least one layer made of the photopolymerizable material and a carrier film which can be peeled off from the layer.
  • the layer composite can optionally also comprise a further peelable film on the side of the layer facing away from the carrier film.
  • Both the carrier film and the second film can be treated in a suitable manner for better peelability, for example by siliconization or by coating with a suitable stripping layer.
  • stripping layers are also known as release layers in the field of flexoplate technology and can consist, for example, of polyamides or polyvinyl alcohols.
  • the photopolymerizable material is customary photopolymerizable materials which are typical for use in flexographic printing elements and comprise at least one elastomeric binder, ethylenically unsaturated monomers and a photoinitiator or a photoinitiator system. Such mixtures are disclosed for example by EP-A 084851.
  • the elastomeric binder can be a single binder or a mixture of different binders.
  • suitable binders are the known vinyl aromatic / diene copolymers or block copolymers, such as se conventional block copolymers of the styrene-butadiene or styrene-isoprene type, furthermore diene / acrylonitrile copolymers, ethylene / propylene / diene copolymers or diene / acrylate acrylic acid copolymers.
  • Mixtures of different binders can of course also be used.
  • binders or binder mixtures which have the lowest possible tack.
  • Thermoplastic-elastomeric binders of the styrene-butadiene type have proven particularly useful for the process according to the invention. These can be two-block copolymers, three-block copolymers or multiblock copolymers in which several styrene and butadiene blocks alternate in succession. It can be linear, branched or star-shaped block copolymers.
  • the block copolymers used according to the invention are preferably styrene-butadiene-styrene three-block copolymers, it having to be taken into account that commercially available three-block copolymers usually have a certain proportion of two-block copolymers.
  • SBS block copolymers are commercially available, for example under the name Kraton®. Mixtures of different SBS block copolymers can of course also be used. The person skilled in the art makes a suitable selection from the various types depending on the desired properties of the layer.
  • Styrene-butadiene block copolymers are preferably used which have an average molecular weight M w (weight average) of 100,000 to 250,000 g / mol.
  • M w weight average
  • the preferred styrene content of such styrene-butadiene block copolymers is 20 to 40% by weight, based on the binder.
  • the ethylenically unsaturated monomers are, in particular, acrylates or methacrylates of mono- or polyfunctional alcohols, acrylic or methacrylamides, vinyl ethers or vinyl esters.
  • examples include butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, butanediol di (meth) acrylate or hexanediol di (meth) acrylate.
  • Aromatic compounds for example keto compounds such as benzoin or benzoin derivatives, are suitable as initiators for the photopolymerization.
  • the photopolymerizable mixtures can further comprise customary auxiliaries such as, for example, inhibitors for thermally initiated polymerization, plasticizers, dyes, pigments, photochromic additives, antioxidants, antiozonants or extrusion aids.
  • auxiliaries such as, for example, inhibitors for thermally initiated polymerization, plasticizers, dyes, pigments, photochromic additives, antioxidants, antiozonants or extrusion aids.
  • the type and amount of the components of the photopolymerizable layer are determined by the person skilled in the art depending on the desired properties and the desired use of the flexographic printing element according to the invention.
  • the person skilled in the art can also select specially adapted formulations for the layer for laser direct engraving.
  • formulations are disclosed, for example, by WO 02/76739, WO 02/83418, WO 03/45693 or the as yet unpublished documents with the file numbers DE 10227 188.7, DE 10227 189.5, to which we expressly refer here.
  • the layer composites can be produced in a manner known in principle by dissolving all components of the photopolymerizable layer in a suitable solvent, pouring them onto the removable carrier film and letting the solvent evaporate.
  • the layer composite is preferably produced in a manner also known in principle by melt extrusion and calendering between the peelable carrier film and a further peelable film.
  • Such photopolymerizable layer composites are also commercially available, for example as nyloflex ® SL (BASF Drucksysteme GmbH).
  • Layer composites can also be used which have two or more photopolymerizable layers.
  • the thickness of the layer composite is generally 0.4 to 7 mm, preferably 0.5 to 4 mm and particularly preferably 0.7 to 2.5 mm.
  • the photopolymerizable layer can optionally be pre-exposed from the back with actinic light before the application to the hollow cylinder in process step (e).
  • the pre-exposure is carried out on the side of the photopolymerizable layer facing away from the carrier film, that is to say the later underside of the layer.
  • the surface of the photopolymerizable layer can be irradiated directly. If a second peelable film is present, this second film can either be peeled off or it is preferably exposed through the film, provided the film is sufficiently transparent.
  • the pre-exposure is carried out in analogy to the usual back pre-exposure of flexographic printing plates.
  • the pre-exposure time is usually only a few seconds up to a maximum of one minute and is determined by the person skilled in the art depending on the desired properties of the layer. Of course, the pre-exposure time also depends on the intensity of the actinic light. Only the surface of the layer is polymerized, but the entire layer is never polymerized.
  • the person skilled in the art determines whether a pre-exposure step is carried out or not. If the further processing of the flexographic printing element into flexographic printing plates is provided in the conventional way by imagewise exposure and development using a solvent, pre-exposure is generally recommended, although not always absolutely necessary. If further processing by means of direct laser engraving is provided, a pre-exposure step is generally superfluous.
  • the pre-exposure should take place before the layer composite is cut to size in step (b), in order to ensure a problem-free connection of the cut edges. If a transparent sleeve is used, the pre-exposure can of course also only take place after the layer has been applied to the sleeve from the inside of the sleeve.
  • the trimming is carried out by means of miter cuts, that is to say by means of cuts which are not guided perpendicularly through the layer composite, but rather at an angle.
  • the length of the layer composite is dimensioned by the cuts in such a way that the circumference of the sleeve can be completely encased and the ends provided with the miter cuts essentially lie on one another but do not overlap.
  • the miter angle is 10 ° to 80 °, preferably 20 ° to 70 °, particularly preferably 30 ° to 60 ° and for example 50 °.
  • the angles mentioned relate to the perpendicular through the layer. Both cut edges can be cut with the same miter angle. Smaller deviations of the miter angle of the two cutting edges from one another are also possible without impairing the proper connection of the cutting edges. Rather, slightly different miter angles can be used in a particularly elegant manner to ensure that the inside diameter of the photopolymerizable layer is somewhat smaller than the outside diameter.
  • the miter angles are calculated in such a way that after cutting, the later inside of the photopolymerizable layer is exactly the right amount shorter than the later outside. As a rule, however, the angles should not differ from one another by more than approximately 20 °, preferably not more than 10 °.
  • the side edges can also be cut, provided the width of the raw material is not already suitable.
  • the side edges are preferably cut straight.
  • the width of the layered composite can of course not exceed the maximum sleeve length. As a rule, the entire length of the sleeve is not covered with the photopolymer material, but it is attached to the end a narrow strip of which was left uncovered. This is determined by the person skilled in the art depending on the desired properties of the flexographic printing element.
  • the hollow cylinders used as carriers are conventional hollow cylinders that are suitable for mounting on air cylinders, i.e. can expand slightly under the influence of compressed air. Hollow cylinders of this type are also referred to as sleeves or sometimes also as seals, base sleeves or the like.
  • the hollow cylinders used as supports are referred to below as such as sleeves, while the term “sleeve” is intended to be reserved for the flexographic printing element as a whole, that is to say including the more photopolymerizable layer, adhesive layer and any further layers.
  • Sleeves made of polymeric materials are particularly suitable for carrying out the process according to the invention.
  • the polymeric materials can also be reinforced, for example with glass fiber fabrics. It can also be multi-layer materials.
  • sleeves made of metals for example those made of nickel, can of course be used.
  • the thickness, diameter and length of the sleeve are determined by the person skilled in the art depending on the desired properties and the desired application. By varying the wall thickness with a constant inner diameter (necessary for mounting on certain printing cylinders), the outer circumference of the sleeve and thus the so-called printing length can be determined.
  • the term “printing length” is understood by the person skilled in the art to mean the length of the printed motif when the printing cylinder is rotated.
  • Suitable sleeves with wall thicknesses of 1 to 100 mm are commercially available, for example as Blue Light from Rotec or from Polywest or Rossini. It can be both compressible sleeves and so-called hard-coated sleeves.
  • the hollow cylinders used are pushed and locked onto a rotatably mounted carrier cylinder in method step (c), so that the hollow cylinder is firmly connected to the carrier cylinder and no movement relative to one another is possible.
  • the carrier cylinder provides a firm hold for the subsequent calendering process.
  • the locking can be done for example by clamping or screwing.
  • the carrier cylinder is preferably an air cylinder, the mode of operation of which corresponds to the air cylinders used in printing presses.
  • the sleeve is then assembled very elegantly by connecting the air cylinder to compressed air to push it on, thus allowing the sleeve to be slid on.
  • the sleeve After switching off the compressed air the sleeve is firmly locked onto the air cylinder.
  • the circumference of the air cylinder can also be enlarged in a manner known in principle by using so-called adapters or bridge sleeves (actually sleeves).
  • adapters or bridge sleeves actually sleeves.
  • sleeves with a larger inner diameter can be used, and thus longer print lengths can be achieved with the same air cylinder.
  • Adapter sleeves are also commercially available (eg from Rotec).
  • an adhesive layer is applied to the outer surface of the hollow cylinder.
  • the adhesive layer should also provide good adhesion even at elevated temperatures, such as those which prevail during the calendering process. In particular, it should impart very good shear strength so that the photopolymerizable layer does not slip on the surface of the hollow cylinder during the calendering process.
  • the adhesive layer can be a suitable adhesive lacquer which is applied to the surface of the hollow cylinder.
  • the adhesive layer is preferably a double-sided adhesive film.
  • Double-sided adhesive films for mounting printing plates are known and are available in various embodiments.
  • the adhesive films can be foam adhesive films which additionally have a damping foam layer.
  • the adhesive film should have the highest possible static shear strength.
  • the static shear strength is determined based on DIN EN 1943.
  • a piece of the adhesive film with precisely defined dimensions is stuck on a polished metal plate and pulled horizontally with a precisely defined force. The time is measured until the tape has moved 2.5 mm on the surface.
  • the test can be carried out at elevated temperatures. The details of the test are summarized in the example section.
  • an adhesive film which has a static shear strength of at least 3 h, preferably at least 10 h and particularly preferably at least 100 h at 70.degree.
  • an adhesive tape is preferably used, the foam layer of which consists of an open-cell foam, for example an open-cell PU foam. This usually results in a smoother surface of the photopolymerizable layer in the area where the ends of the adhesive tape meet than when using closed-cell foams.
  • the double-sided adhesive tape should be glued to the surface of the hollow cylinder in such a way that the cut edges abut each other and there is essentially no space between the ends, nor do the ends overlap.
  • the photopolymerizable layer is applied to the hollow cylinder provided with the adhesive layer.
  • the cut, layered composite is applied with the side facing away from the temporary carrier film onto the hollow cylinder provided with the adhesive layer. If a second peelable film is present, it must of course be removed, including any decoating layer, before application.
  • the application should be bubble-free and is carried out in such a way that the ends provided with the miter cut essentially lie on one another but do not overlap.
  • FIG. 1 schematically shows a cross section through a flexographic printing element prepared for calendering, in which the edges to be connected are each cut to size using a miter cut and placed one above the other: an adhesive tape (2) and the photopolymerizable layer (3 ) applied. The edges to be joined are cut to size using miter cuts (4) and placed one above the other.
  • the arrow (7) indicates the preferred direction of rotation of the flexographic printing element during calendering.
  • the air cylinder has been omitted in Fig. 1 for the sake of clarity.
  • the application of the layer element is expediently started with the cut edge, the underside of which is longer than the top (FIG. 1, (5)).
  • the second cutting edge (6) After complete wrapping, the second cutting edge (6), with the top being longer than the bottom, finally lies on the first cutting edge.
  • the carrier film including any detackifying layer which may be present, is removed from the layer of photopolymer material (process step (f)).
  • the cut edges are connected.
  • the surface of the photopolymerizable layer on the hollow cylinder is brought into contact with a rotating calender roll until the cut edges are connected to one another.
  • the carrier cylinder and the calender roll rotate against each other.
  • the necessary calender pressure is determined by the person skilled in the art, depending on the type of photopolymerizable layer, by adjusting the distance between the carrier cylinder and the calender roller.
  • the calendering temperature depends on the type of photopolymerizable layer and the desired properties. However, the temperature of the calendering roll is set according to the invention in such a way that that the temperature of the photopolymerizable layer is in any case below its melting temperature, so that the negative effects mentioned above are avoided by melting the layer.
  • the heat is expediently supplied by using a calender roll which is heated from the inside.
  • the heat can also be supplied, for example, by IR radiators or warm gas flows.
  • heat sources can also be combined.
  • the temperature during calendering is 80 to 130 ° C., preferably 90 to 120 ° C., measured in each case on the surface of the photopolymerizable layer.
  • Calendering is particularly preferably carried out in such a way that the coated hollow cylinder rotates in the direction (7) during calendering.
  • the preferred direction of rotation is indicated by the arrow (7) in FIG. 1 and FIG. 2 and can be achieved by appropriately setting the direction of rotation of the rollers. Since the calender roll and the coated hollow cylinder rotate against each other during calendering (Fig. 2), the upper cutting edge (6) is calendered in the direction of decreasing layer thickness in this direction of rotation. This advantageously avoids setting up the gap, although in special cases it is also possible to calender in the opposite direction. As a rule, it takes around 15 minutes to completely close the gap, although this time also depends on the temperature and pressure selected.
  • the cut edges are firmly connected to one another by calendering.
  • the connection takes place mainly in the area of the photopolymer layer which has not been pre-exposed. In the lower layer area, which was pre-exposed, the edges do not connect or at least do not bond as well. Of course, this also depends on the intensity of the pre-exposure and thus on the degree of pre-crosslinking. Surprisingly, however, a very good, durable connection of the edges can be achieved by means of the method according to the invention.
  • the processed hollow cylinder / finished sleeve is removed from the carrier cylinder again.
  • the apparatus shown schematically in FIG. 2 has proven particularly useful for carrying out the method, without the invention being thus restricted to the use of this apparatus.
  • the apparatus has an air cylinder (8) and a heatable calender roll (9). Both cylinders are pivoted. The suspensions of the cylinders are not shown for the sake of clarity. At least one of the two rollers is also movably mounted in the horizontal direction, so that the rollers together and can be moved apart. This is shown schematically by the double arrow (13). For heating, for example, electrical heating elements can be built into the calender roll or hot oil can flow through the roll.
  • An auxiliary roller (10) is also provided as an aid for mounting, the distance of which from the air cylinder can be adjusted.
  • the auxiliary roller (10) is preferably arranged below the air cylinder.
  • the auxiliary roller is preferably a rubber roller.
  • the apparatus also has a feed device (11) for the photopolymerizable layer and / or the adhesive film.
  • the feed device can, for example, simply be an assembly table on which the photopolymerizable layer and / or the adhesive film are placed and from there can be inserted evenly into the gap between the sleeve and the auxiliary roller. This can preferably be done by hand using a suitable sliding device.
  • the calender roll should have as little adhesion to the photopolymerizable layer as possible. It can, for example, be polished or have a coating for detackification, for example a Teflon coating.
  • the apparatus can of course also comprise further assemblies.
  • a sleeve (12) is first pushed onto the air cylinder (8). Then the adhesive film is cut to size on the assembly table (11), the air cylinder is rotated and the film is slowly pushed into the gap between the auxiliary roller (0) and the air cylinder (8) provided with the sleeve (12). The adhesive film is carried along by the rotation, the auxiliary roller pressing the film onto the sleeve, so that the adhesive film sticks to the sleeve without bubbles. The protective film is then removed from the adhesive film. The sleeve is now provided with an adhesive layer.
  • the cut photopolymerizable layer composite is pushed into the gap, carried along and pressed down by the auxiliary roller (10).
  • the possibly pre-exposed underside of the layer is directed towards the sleeve. If the photopolymerizable layer has a second, peelable film, this is peeled off beforehand.
  • the calender roller and the air cylinder provided with the sleeve, adhesive layer and photopolymerizable layer are brought into contact with one another, set in rotation, and the gap is closed by calendering with the hot calender roller.
  • the preferred direction of rotation during calendering is (7).
  • Process steps (a) to (h) can be carried out in this order. Variations are also possible. It is therefore entirely possible to first apply the adhesive layer (step (c)) and the photopolymerizable layer (step (e)) to the sleeve apply, and only then push the coated sleeve onto the carrier cylinder (c).
  • the cylindrical, seamless seamless flexographic printing elements obtainable by the method according to the invention differ from those known from the prior art. Traces of the miter cut can still be recognized as a point of discontinuity in the area of the closed seam using suitable analysis methods (e.g. microscopic observation, possibly using polarized light). If pre-exposed, the seam in the lower layer area can be clearly seen. Nevertheless, a printing layer which is completely uniform with regard to the printing properties is obtained, so that there is no longer any visible seam in the printed image. Tensile strain measurements with layer samples from the area of the closed seam as well as those without a seam have comparable values.
  • the flexographic printing elements according to the invention are outstandingly suitable as a starting material for the production of cylindrical, endlessly seamless flexographic printing plates.
  • flexographic printing elements can be exposed imagewise in a manner known in principle, and the unexposed areas of the relief-forming layer can subsequently be removed by means of a suitable development process.
  • the imagewise exposure can in principle take place by enveloping the seal with a photographic mask and exposing it through the mask.
  • the imaging is preferably carried out using digital masks.
  • digital masks are also known as in-situ masks.
  • a digitally imageable layer is first applied to the photopolymerizable layer of the sleeve.
  • the digitally imageable layer is preferably a layer selected from the group of IR-ablative layers, ink-jet layers or thermographically writable layers.
  • IR-ablative layers or masks are opaque for the wavelength of the actinic light and usually comprise a binder and at least one IR absorber such as carbon black. Soot also ensures that the layer is opaque.
  • a mask can be written into the IR-ablative layer using an IR laser, ie the layer is decomposed and removed where it is struck by the laser beam. Examples of the imaging of flexographic printing elements with IR-ablative masks are disclosed, for example, in EP-A 654 150 or EP-A 1 069475.
  • ink jet layers a layer which can be written on with ink jet inks and is permeable to actinic light, for example a gelatin layer, is applied.
  • a mask with opaque ink is applied to these using ink-jet printers. Examples are disclosed in EP-A 1 072953.
  • Thermographic layers are layers that contain substances that turn black under the influence of heat.
  • Such layers comprise, for example, a binder and an organic silver salt and can be imaged by means of a printer with a thermal head. Examples are disclosed in EP-A 1 070989.
  • the digitally imageable layers can be produced by dissolving or dispersing all constituents of the respective layer in a suitable solvent and applying the solution to the photopolymerizable layer of the cylindrical flexographic printing element, followed by evaporation of the solvent.
  • the digitally imageable layer can be applied, for example, by spraying or by means of the technique described by EP-A 1 158365.
  • Components which are soluble in water or predominantly aqueous solvent mixtures are preferably used to produce the digitally imageable layer.
  • the digitally imageable layer After the digitally imageable layer has been applied, it is imaged by means of the appropriate technique and then the sleeve is irradiated through the mask formed in a manner known in principle by means of actinic light.
  • actinic light In a known manner, UVA or UV / VIS radiation is particularly suitable as actinic, ie chemically “effective” light.
  • Round imagesetters for uniform exposure of SIeeves are commercially available.
  • the imagewise exposed layer can be developed in a conventional manner by means of a solvent or a solvent mixture.
  • the unexposed, i.e. the areas of the relief layer covered by the mask are removed by dissolving in the developer, while the exposed, i.e. the networked
  • the mask or the remains of the mask are also removed by the developer if the components are soluble therein. If the mask is not soluble in the developer, it may be removed using a second solvent before development.
  • the development can also take place thermally. No solvent is used in thermal development. Instead, after the imagewise exposure, the relief-forming layer is brought into contact with an absorbent material and heated.
  • the absorbent material is, for example, a porous fleece, for example made of nylon, polyester, cellulose or inorganic materials. It is heated to a temperature such that the unpolymerized portions of the relief-forming layer liquefy and can be absorbed by the fleece. The soaked fleece is then removed.
  • thermal development Details of thermal development are disclosed, for example, by US 3,264,103, US 5,175,072, WO 96/14603 or WO 01/88615.
  • the mask can optionally be removed beforehand using a suitable solvent or also thermally.
  • Cylindrical flexographic printing plates can also be produced from the photopolymerizable, endlessly seamless flexographic printing elements by means of direct laser engraving.
  • the photopolymerizable layer is first completely cross-linked in its entire volume by means of actinic light without the application of a mask.
  • a print relief is then engraved into the cross-linked layer using one or more lasers.
  • the full-surface networking can be carried out with conventional platesetters for SIeeves as described above. However, it can also be carried out particularly advantageously based on the method described in WO 01/39897. It is exposed in the presence of a protective gas which is heavier than air, for example C0 2 or Ar.
  • a protective gas which is heavier than air, for example C0 2 or Ar.
  • the photopolymerizable, cylindrical flexographic printing element is lowered into a plunge pool filled with protective gas, the walls of which are preferably lined with a reflective material, for example aluminum foil.
  • the lowering is preferably carried out so that the axis of rotation of the cylindrical flexographic printing element is vertical.
  • the immersion tank can be filled with protective gas, for example, by introducing dry ice into the immersion tank, which displaces the atmospheric oxygen when it evaporates.
  • actinic light It is then exposed from above using actinic light.
  • the usual UV or UV / VIS sources for actinic light can be used for this.
  • Radiation sources are preferably used which emit essentially visible light and no or only a small proportion of UV light.
  • Light sources are preferred which emit light with a wavelength of more than 300 nm.
  • conventional halogen lamps can be used.
  • the method has the advantage that the ozone load customary in short-wave UV lamps is almost completely eliminated, protective measures against strong UV radiation are generally unnecessary and no complex equipment is required. This process step can thus be carried out particularly economically.
  • the relief layer absorbs laser radiation to such an extent that it is removed or at least detached at those locations where it is exposed to a laser beam of sufficient intensity.
  • the layer is preferably vaporized or thermally or oxidatively decomposed without melting beforehand, so that its decomposition products are removed from the layer in the form of hot gases, vapors, smoke or small particles.
  • Lasers having a wavelength of 9000 nm to 12000 nm are particularly suitable for engraving the relief-forming layers used according to the invention.
  • C0 2 lasers are particularly noteworthy.
  • the binders used in the relief-forming layer absorb the radiation from such lasers to a sufficient extent so that they can be engraved.
  • a laser system can be used for engraving, which only has a single laser beam.
  • laser systems are preferably used which have two or more laser beams. At least one of the beams is preferably specially adapted for producing coarse structures and at least one of the beams is specially adapted for writing fine structures.
  • Such systems can be used to produce high-quality printing forms in a particularly elegant manner.
  • the beam for producing the fine structures can have a lower power than the beams for producing coarse structures.
  • the combination of a beam with a power of 50 to 150 W with two beams of 200 W or more has proven to be particularly advantageous.
  • Multi-beam laser systems which are particularly suitable for laser engraving and suitable engraving methods are known in principle and are disclosed, for example, in EP-A 1 262315 and EP-A 1 262316.
  • the depth of the elements to be engraved depends on the overall thickness of the relief and the type of elements to be engraved and is determined by the person skilled in the art depending on the desired properties of the printing form.
  • the depth of the relief elements to be engraved is at least 0.03 mm, preferably 0.05 mm - the minimum depth between individual grid points is mentioned here.
  • Printing forms with too low relief depths are generally unsuitable for printing using flexographic printing technology because the negative elements are full of printing ink.
  • Individual negative points should usually have greater depths; for those with a diameter of 0.2 mm, a depth of at least 0.07 to 0.08 mm is usually recommended.
  • the cylindrical flexographic printing plate obtained can advantageously be cleaned after the laser engraving in a further process step, in some cases this can be done by simply blowing off with compressed air or brushing. However, it is preferred to use a liquid cleaning agent for subsequent cleaning in order to also be able to completely remove polymer fragments.
  • Suitable are, for example, aqueous cleaning agents which essentially consist of water and optionally small amounts of alcohols and which can contain auxiliaries such as surfactants, emulsifiers, dispersing aids or bases to support the cleaning process.
  • auxiliaries such as surfactants, emulsifiers, dispersing aids or bases to support the cleaning process.
  • Water-in-oil emulsions as disclosed by EP-A 463016 are also suitable.
  • the cylindrical printing forms obtained by means of digital imaging or direct laser engraving are ideal for printing endless patterns. They can also have any printing areas in the area of the seam without the seam still being visible in the printed image. If adhesive tape was used as the adhesive layer, the printing layer can be pulled off the sleeve very easily and used again.
  • Various types of sleeves can be used, for example compressible sleeves or hard-coated sleeves.
  • the layer element used as the starting material for the method according to the invention was produced in a manner known in principle from the components by melt extrusion and calendering between two detachable coated removable PET films (carrier film and so-called second film).
  • the photopolymerizable layer had a thickness of 1.14 mm.
  • a layer element was produced in the same manner as described for layer element 1, except that the following starting materials were used for the photopolymerizable layer.
  • the auxiliary roller (10) was rubberized.
  • the calender roll was siliconized.
  • a simple assembly table functioned as the input device (11).
  • a sleeve (Blue Light, from Rotec, inner diameter 136.989 mm, outer diameter 143.223 mm was pushed onto the air cylinder of the apparatus described above and fixed. The sleeve was then covered with a 500 ⁇ m thick compressive adhesive tape with high shear strength (Rogers SA 2120, shear strength at 70 ° C> 100 h) without gaps
  • the compressible layer of the adhesive tape consisted of an open-cell PU foam.
  • Layer element 1 was exposed to actinic light from the rear through the one of the two PET films for 12 s. Layer element 1 was then cut to size. The two abutting edges were cut at an angle of 50 ° and 55 °, in each case with respect to the vertical, in such a way that the pre-exposed side of the layer was shorter than the non-pre-exposed side.
  • the layer was pressed on with the auxiliary roller (10).
  • the calender roll was heated to approximately 130 ° C., set in rotation (50 rpm) and brought into contact with the photopolymerizable layer.
  • the distance between the calender roll and the air cylinder was set so that a “negative gap” of 300 ⁇ m resulted (ie the calender roll was pressed 300 ⁇ m into the elastomeric, photopolymerizable layer).
  • the gap was closed by calendering for 15 minutes.
  • the rotation was carried out in the direction of 7.
  • the surface temperature of the photopolymerizable layer was approximately 95 ° C.
  • the rollers were then moved apart again and the coated sleeve was removed from the air cylinder after cooling.
  • a cylindrical, photopolymerizable, endlessly seamless flexographic printing element was obtained.
  • the surface of the pressure element was completely flat in the area of the seam and there were no traces of the seam to be seen.
  • a cut in the area of the seam showed that the seam in the pre-exposed layer area was not completely closed, but the closure in the upper layer area was so good that overall, an extremely durable connection was obtained.
  • Tensile strain measurements on the exposed material showed that samples with a gap and samples from the full surface did not differ significantly in terms of tensile strain.
  • Example 2 The procedure was as in Example 1, except that layer element 2 was used as the starting material. Furthermore, no pre-exposure was carried out and the calendering roller was heated to 135 ° C. The surface temperature of the flex pressure element during calendering was 100 ° C.
  • a cylindrical, photo-polymerizable, endlessly seamless flexographic printing element was obtained.
  • Example 2 The procedure was as in Example 1, except that the layer composite was not cut to size using miter cuts, but two vertical cuts were made. After covering the sleeve with the photopolymerizable material, a small V-shaped gap remained at the joint of the two vertical cuts. The gap could be closed by calendering, but a small depression remained on the seam.
  • Example 2 The procedure was as in Example 1, except that the calender roll was heated to 150 to 160 ° C.
  • the surface temperature of the flexographic printing element was approximately 120 ° C.
  • the seam could be closed, but the surface of the photopolymerizable layer was deformed too much due to the high temperature load and showed too large tolerances after cooling. It had to be reground and smoothed in order to obtain sufficient quality for flexographic printing. Furthermore, the back side pre-exposure lost its effect.
  • a layer element was produced by extrusion and calendering. However, only one of the two PET films was peelable, while the other PET film was connected to the photopolymerizable layer by an adhesive varnish. As described in Example 1, the non-peelable PET film was used for pre-exposure. After trimming cut as described, the layer element with the pre-exposed side and with the non-removable film was mounted on the sleeve and calendered. A seam seal was obtained, but the joint of the non-removable PET film was still visible as an impression on the layer surface.
  • Example 2 The procedure was as in Example 1, except that an adhesive tape with a shear strength of only 2.3 h at 70 ° C. was used.
  • the photopolymerizable layer could be applied without problems, but the adhesive tape slipped slightly on the sleeve during calendering. The joint of the adhesive tape was still clearly visible as an imprint in the surface of the photopolymerizable layer.
  • the photosensitive flexographic printing element with an IR-ablative layer was then imaged using an Nd / YAG laser with an endless pattern.
  • the pattern was chosen so that printing areas were also provided in the area of the seam connection.
  • the illustrated sleeve was 20 min in a platesetter. exposed to actinic light, then developed with the aid of a flexo washing agent (nylosolv ⁇ II), dried for 2 hours at 40 ° C and post-exposed to UV / A and UV / C for 15 minutes.
  • a flexo washing agent nylosolv ⁇ II
  • the photosensitive flexographic printing element according to test 2 was irradiated in a plunge pool lined with aluminum foil under CO 2 protective gas with an Hg halogen lamp from Hönle and the photosensitive layer was completely crosslinked.
  • Example 3 The procedure was as in Example 3, except that the flexographic printing elements according to V1, V3 and V4 were used in each case.
  • Printing machine W&H (Windmöller and Hölscher), printing speed: 150 m / min, substrate: PE film

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

L'invention concerne un procédé de production d'éléments pour impression flexographique cylindriques photopolymérisables, sans soudure continue, par application d'une couche de matériau photopolymérisable sur la surface extérieure d'un cylindre creux, et liaison des bords par calandrage. L'invention concerne en outre l'utilisation de tels élément de flexographie pour la production de formes pour impression flexographique.
EP04727243A 2003-04-17 2004-04-14 Procede de production d'elements pour impression flexographique cylindriques photopolymerisables, sans soudure continue, et utilisation de ce procede pour la production de formes pour flexographie Withdrawn EP1614006A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10318042A DE10318042A1 (de) 2003-04-17 2003-04-17 Verfahren zur Herstellung von fotopolymerisierbaren, zylindrischen, endlos-nahtlosen Flexodruckelementen und deren Verwendung zur Herstellung zylindrischer Flexodruckformen
PCT/EP2004/003955 WO2004092841A2 (fr) 2003-04-17 2004-04-14 Procede de production d'elements pour impression flexographique cylindriques photopolymerisables, sans soudure continue, et utilisation de ce procede pour la production de formes pour flexographie

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EP1614006A2 true EP1614006A2 (fr) 2006-01-11

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EP04727243A Withdrawn EP1614006A2 (fr) 2003-04-17 2004-04-14 Procede de production d'elements pour impression flexographique cylindriques photopolymerisables, sans soudure continue, et utilisation de ce procede pour la production de formes pour flexographie

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US (1) US20060249239A1 (fr)
EP (1) EP1614006A2 (fr)
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DE10353762A1 (de) * 2003-11-17 2005-06-23 Basf Drucksysteme Gmbh Verfahren zur Herstellung von Flexodruckformen durch thermische Entwicklung
DE102004050277A1 (de) 2004-10-14 2006-04-27 Basf Drucksysteme Gmbh Verfahren und Vorrichtung zur Herstellung von fotopolymerisierbaren, zylindrischen, endlos-nahtlosen Flexodruckelementen
DE102005037909A1 (de) * 2005-08-10 2007-02-15 Saueressig Gmbh + Co. Verfahren zur Herstellung von zylindrischen, endlos-nahtlosen Oberflächen
DE102006028640A1 (de) * 2006-06-22 2008-01-03 Flint Group Germany Gmbh Fotopolymerisierbarer Schichtenverbund zur Herstellung von Flexodruckelementen
DE102007006378A1 (de) 2007-02-08 2008-08-14 Flint Group Germany Gmbh Fotopolymerisierbare zylindrische endlos-nahtlose Flexodruckelemente und daraus hergestellte harte Flexodruckformen
EP2026132B1 (fr) * 2007-08-16 2013-03-13 E. I. Du Pont de Nemours and Company Procédé pour la fabrication d'un élément photosensible de forme cylindrique pour une utilisation en tant que forme d'impression
NL2001381C2 (nl) * 2008-03-17 2009-09-21 Av Flexologic Bv Werkwijze voor het aanbrengen van een in hoofdzaak uit fotopolymeer vervaardigde flexibele drukplaat op een drager, en inrichting voor toepassing van een dergelijke werkwijze.
DE102008024214A1 (de) 2008-05-19 2009-11-26 Flint Group Germany Gmbh Fotopolymerisierbare Flexodruckelemente für den Druck mit UV-Farben
EP2154572B1 (fr) * 2008-08-15 2017-05-03 E. I. du Pont de Nemours and Company Procédé pour la fabrication d'un élément photosensible de forme cylindrique pour une utilisation en tant que forme d'impression
JP5955539B2 (ja) 2010-12-03 2016-07-20 イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニーＥ．Ｉ．Ｄｕ Ｐｏｎｔ Ｄｅ Ｎｅｍｏｕｒｓ Ａｎｄ Ｃｏｍｐａｎｙ 印刷で使用するシリンダ形状要素を作製する方法
JP5274599B2 (ja) * 2011-02-22 2013-08-28 富士フイルム株式会社 レーザー彫刻用レリーフ印刷版原版及びその製造方法、並びに、レリーフ印刷版及びその製版方法
CN104619511A (zh) * 2012-09-14 2015-05-13 富士胶片株式会社 圆筒状印刷原版及其制造方法、以及圆筒状印刷版及其制版方法
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CN105705335B (zh) 2013-10-29 2018-01-23 东洋纺株式会社 圆筒状凸版印刷原版的制造方法
KR102039909B1 (ko) * 2016-09-01 2019-11-04 주식회사 엘지화학 관통형의 기공 또는 구멍들이 형성된 집전체를 사용하여 전극을 제조하는 방법

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DE10318042A1 (de) 2004-11-04
WO2004092841A2 (fr) 2004-10-28
WO2004092841A3 (fr) 2005-03-17
US20060249239A1 (en) 2006-11-09

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