EP1815297A2 - Method for producing flexographic printing forms and appropriate flexographic printing element - Google Patents
Method for producing flexographic printing forms and appropriate flexographic printing elementInfo
- Publication number
- EP1815297A2 EP1815297A2 EP05807853A EP05807853A EP1815297A2 EP 1815297 A2 EP1815297 A2 EP 1815297A2 EP 05807853 A EP05807853 A EP 05807853A EP 05807853 A EP05807853 A EP 05807853A EP 1815297 A2 EP1815297 A2 EP 1815297A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- flexographic printing
- layer
- dye
- printing element
- range
- 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- Withdrawn
Links
Classifications
-
- 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
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/40—Treatment after imagewise removal, e.g. baking
-
- 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
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2022—Multi-step exposure, e.g. hybrid; backside exposure; blanket exposure, e.g. for image reversal; edge exposure, e.g. for edge bead removal; corrective exposure
- G03F7/2024—Multi-step exposure, e.g. hybrid; backside exposure; blanket exposure, e.g. for image reversal; edge exposure, e.g. for edge bead removal; corrective exposure of the already developed image
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- 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
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/105—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having substances, e.g. indicators, for forming visible images
Definitions
- the invention relates to a process for the production of flexographic printing plates by imagewise exposure of a flexographic printing element, washing and drying, in which the drying is carried out essentially with the aid of radiation.
- the invention further relates to a particularly suitable for carrying out the method Flexo réelle- ckelement.
- a photopolymerizable film printing element can first be irradiated by a suitable, photographically or digitally prepared mask. After that, the unexposed, i. removed from uncrosslinked areas. This can be done for example with the aid of suitable solvents or solvent mixtures. Although the exposed, crosslinked areas are not dissolved in the course of the washout process, they swell up in the washout agent. Therefore, before use for printing, the flexographic printing plate must be carefully dried again.
- the drying is usually carried out at about 65 ° C in circulating air dryers. Recirculating air dryers are commercially available. In this case, the flexographic printing plate is dried in a heated stream of air. Depending on the plate thickness, the drying time in this conventional type of drying is between 2 and 4 hours. Drying is thus usually the most time-consuming step in the production of flexographic printing plates. This precludes immediate processing of print jobs using flexographic printing technology.
- the carrier in flexographic printing plates usually consists of a PET film. It is therefore not possible with such flexographic printing plates to increase the temperature to accelerate the drying, because otherwise the PET film can warp, and the printing plate is thus unusable. From WO 03/14831 has been proposed for newspaper flexographic printing plates, a metallic carrier and a thin only
- dyes to the relief layers of flexographic printing plates. These may in particular be dyes which absorb substantially in the spectral range between 300-400 nm. Examples of such dyes are disclosed in EP-A 553 662. By adding these absorbers, absorption of the light scattered in the non-image areas occurs, and polymerization into them Areas are thereby prevented. As a result, the intermediate depths of the negative elements remain open and the exposure latitude lengthens.
- dyes are also used which change color when exposed to actinic light, resulting in color change in the exposed areas of the printing form.
- dyes are used for aesthetic purposes.
- the object of the invention was to provide an improved process for the production of flexographic printing plates as well as suitable starting materials, in which the speed of the drying step is significantly increased.
- the starting material used is a photopolymerizable flexographic printing element which comprises at least one stacked one above the other
- At least one photopolymerizable, relief-forming layer comprising at least one elastomeric binder, ethylenically unsaturated monomers, photoinitiator and a dye,
- a photopolymerizable flexographic printing element which, arranged above one another, at least
- a dimensionally stable carrier at least one photopolymerizable relief-forming layer, at least one elastomeric binder, ethylenically unsaturated monomers, photoinitiator and a dye,
- the amount of the dye is 0.005 to 2 wt.% With respect to the amount of all components of the layer.
- suitable dimensionally stable supports for the photopolymerizable flexographic printing elements used as starting materials for the process are sheets, films and conical and cylindrical tubes made of metals such as steel, aluminum, copper or nickel or of polymeric materials such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate, polyamide, polycarbonate, optionally also fabrics and nonwovens, such as glass fiber fabric and composite materials, eg made of glass fibers and plastics.
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- polybutylene terephthalate polyamide
- polycarbonate optionally also fabrics and nonwovens, such as glass fiber fabric and composite materials, eg made of glass fibers and plastics.
- Flexographic printing elements whose supports consist of films of polymeric materials, in particular films of polyethylene terephthalate (PET), polyethylene naphthalate (PEN) or polybutylene terephthalate, can preferably be used for the process.
- films usually have a thickness of 100 .mu.m to 250 .mu.m.
- Particularly preferred are films made of PET.
- the flexographic printing element further comprises at least one photopolymerizable, re-forming layer.
- the photopolymerizable, relief-forming layer can be applied directly to the support. However, other layers may also be present between the carrier and the relief-forming layer, for example adhesive layers and / or elastic underlayers.
- the photopolymerizable relief-forming layer comprises at least one elastomeric binder, ethylenically unsaturated monomers, a photoinitiator or a photoinitiator system, a dye and optionally further components.
- Elastomeric binders for the production of flexographic printing elements are known to the person skilled in the art. Both hydrophilic and hydrophobic binders can be used.
- ethylene-acrylic acid copolymers examples which may be mentioned are ethylene-acrylic acid copolymers, polyethylene oxide-polyvinyl alcohol graft copolymers, natural rubber, polybutadiene, polyisoprene, styrene-butadiene rubber, nitrile-butadiene rubber, butyl rubber, styrene-isoprene rubber, polynorbomene rubber or ethylene Propylene-diene rubber (EPDM).
- Preference is given to using hydrophobic binders.
- Such Bindemttel are soluble in organic solvents or at least swell, while they are largely insoluble in water and are not or at least not substantially swellable in water.
- the elastomer is preferably a thermoplastic elastomeric block copolymer of alkenylaromatics and 1,3-dienes.
- the block copolymers may be linear, branched or radial block copolymers. These are usually ABA-type triblock copolymers, but they can also be AB-type diblock polymers or those with a plurality of aging elastomeric and thermoplastic blocks, eg ABABA. It is also possible to use mixtures of two or more different block copolymers. Commercially available triblock copolymers often contain certain proportions of diblock copolymers.
- the diene units can be 1, 2 or 1, 4 linked.
- block copolymers of styrene-butadiene and styrene-isoprene type can be used. They are, for example, under the name Kraton ® commercially Kunststoff ⁇ Lich. Furthermore possible to employ thermoplastic-elastomeric block copolymers having end blocks of styrene and a random styrene-butadiene middle block, which are available under the name Styroflex ®. The block copolymers may also be fully or partially hydrogenated, as in SEBS rubbers.
- the total amount of binders is usually 40 to 80% by weight, based on the sum of all constituents of the relief-forming layer, preferably 40 to 70% by weight and particularly preferably 45 to 65% by weight.
- the photopolymerizable relief-forming layer further comprises polymerizable compounds or monomers in a known manner.
- the monomers should be compatible with the binder and have at least one polymerizable, ethylenically unsaturated double bond.
- Esters or amides of acrylic acid or methacrylic acid with monofunctional or polyfunctional alcohols, amines, amino alcohols or hydroxy ethers and esters, esters of fumaric or maleic acid or allyl compounds have proved to be particularly advantageous.
- Suitable monomers are butyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, 1,9-nonanediol diacrylate, trimethyl lolpropanetri (meth) acrylate, dioctyl fumarate and N-dodecylmaleimide.
- the type and amount of the monomers are selected by the person skilled in the art, depending on the desired properties of the layer. The amount of monomers is as a rule not more than 20% by weight with respect to the amount of all constituents.
- the photopolymerizable relief-forming layer furthermore comprises, in a manner known in principle, at least one photoinitiator or one photoinitiator system.
- suitable initiators are benzoin or benzoin derivatives, such as methylbenzoin or benzoin ethers, benzil derivatives, such as benzil ketals, acylarylphosphine oxides, acylarylphosphinic esters, polynuclear quinones or benzophenones.
- the amount of photoinitiator in the relief-forming layer is generally from 0.1 to 5% by weight, based on the amount of all constituents of the relief-forming layer.
- the relief-forming layer may optionally comprise a plasticizer. It is also possible to use mixtures of different plasticizers.
- suitable plasticizers include modified and unmodified natural oils and resins, such as high-boiling paraffinic, naphthenic or aromatic mineral oils, synthetic oligomers or resins such as oligostyrene, high-boiling esters, oligomeric styrene-butadiene copolymers, oligomeric ⁇ -methylstyrene / p-methylstyrene Copolymers, liquid oligobutadienes, in particular those having a molecular weight between 500 and 5000 g / mol, or liquid oligomeric acrylonitrile-butadiene copolymers or oligomeric ethylene-propylene-diene copolymers.
- vinyl-group-rich polybutadiene oils high-boiling aliphatic esters and mineral oils.
- Particularly preferred are high boiling, substantially paraffinic and / or naphthenic mineral oils.
- so-called paraffinic solvates and specialty oils are commercially available under the names Shell Catenex S and Shell Catenex PH.
- a person skilled in the art distinguishes mineral oils from technical oils which may still have a very low aromatics content, as well as medicinal white oils which are substantially free of aromatics. They are commercially available.
- the amount of optional plasticizer will be determined by one skilled in the art according to the desired properties of the layer. However, it should generally not exceed 40% by weight with respect to the sum of all constituents of the photopolymerizable relief-forming layer.
- the relief-forming layer furthermore comprises at least one colorant which has absorption bands in the range from 450 to 1000 nm.
- the task of the dyestuff is to absorb the radiation used for drying the flexographic printing plate to such an extent that drying as fast as possible is made possible. On the other hand, it should not or at least not adversely affect the properties of the relief-forming layer to an unacceptable extent.
- at the dye may be a dye which is soluble in the relief-forming layer, or may also be a dye in the form of a pigment. Dyes which absorb in the visible region of the spectrum are naturally colored to a greater or lesser extent; dyes which absorb substantially in the NIR range generally have only a weak intrinsic color.
- the dye In the range of 300 to 400 nm, the dye should absorb as little as possible. This prevents interference in the photochemical crosslinking of the layer.
- the dye should have sufficient absorbency.
- the absorption capacity can be determined in a known manner by determining the molar extinction coefficient ⁇ m0 ⁇ .
- the dye in the range from 450 to 1000 nm should have at least one absorption band with an extinction coefficient ⁇ m0 ⁇ of at least 250 l / mol cm, even if the invention is not limited thereto .
- ⁇ is mo
- the extraction coefficient should as a rule not be greater than 250 l / mol cm, preferably not greater than 200 l / mol cm.
- the dye can have one or more absorption bands in the spectral range from 450 to 1000 nm.
- the dye preferably has only one absorption band in the said spectral range.
- the minimum difference between the maximum value of the absorption in the range from 450 to 1000 nm and the maximum value of the absorption in the range from 300 to 400 nm is at least 50 nm.
- the difference between the absorption maxima should preferably be greater. Differences of at least 100 nm, more preferably at least 150 nm, and, for example, those of 200 to 350 nm, have proven useful.
- dyes in particular azo dyes, which have a maximum of absorption between 450 and 700 nm, preferably 550 to 650 nm, can be used particularly advantageously.
- the type of dye is not essential here, provided that it has the DF according to the invention and no negative properties are caused by the addition to the relief-forming layer.
- Examples include common NI R dyes, for example cyanines, naphthalocyanines or NI R dyes based on perylenes.
- corresponding azo dyes can be used. The person skilled in the art makes an appropriate choice among the principally possible dyes.
- the amount of dyes used according to the invention is determined by the person skilled in the art, depending on the desired properties of the printing form and also on the absorption capacity of the dye.
- the amount used according to the invention is 0.005 to 2% by weight with respect to the sum of all constituents of the layer.
- the amount is preferably 0.006 to 1.5% by weight, more preferably 0.008 to 1% by weight, very preferably 0.01 to 0.75% by weight and, for example, 0.0125 to 0.125% by weight.
- the relief-forming layer may optionally comprise additives and / or additives, for example inhibitors for the thermally initiated polymerization, photochromic additives, fillers or antioxidants.
- the layer may optionally also comprise other dyes to be distinguished from the dyes used according to the invention.
- the type and amount of further constituents are determined by the person skilled in the art, depending on the properties of the layer. As a rule, however, not more than 10% by weight should be used in relation to the sum of all constituents of the layer, preferably not more than 5% by weight.
- the photopolymerizable relief-forming layer can also be a plurality of photopolymerizable layers one above the other, which have the same, approximately the same or different composition.
- a multilayer structure has the advantage that the properties of the surface of the printing form, such as, for example, ink transfer, can be changed without influencing the flexotypic properties of the printing form, such as, for example, hardness or elasticity. Surface properties and layer properties can therefore be varied independently of one another in order to achieve an optimum printing result.
- the thickness of the relief-forming layer (s) is determined by the person skilled in the art depending on the desired intended use of the flexographic printing plate and is generally 0.5 to 7 mm, preferably 0.8 to 6 mm, particularly preferably 1 to 5.5 mm and for example 2 to 5 mm.
- the flexographic printing element may optionally comprise further layers in addition to the relief-forming layer.
- Such layers include an elastomeric sub-layer of another formulation located between the backing and the relief-forming layer (s). With such sub-layers, the mechanical properties of the flexographic printing plates can be changed without influencing the properties of the actual printing relief layer.
- elastic substructures which are located under the dimensionally stable support of the flexographic printing element, ie on the side facing away from the relief-forming layer side of the support.
- adhesive layers that bond the backing to overlying layers or to different layers.
- the photopolymerizable flexographic printing element may further comprise a translucent, non-tacky topcoat.
- cover layers are also known as Substrat ⁇ layers or as a release layer. They made it easier to peel off a protective film which may be present before the use of the flexographic printing element and thus avoid damage to the relief-forming layer. They also facilitate the placement and removal of the photographic negative for imaging.
- Substrate layers are formed by a tear-resistant film-forming polymer and any additives contained therein. Examples of suitable, tear-resistant films forming polymers are polyamides, fully or partially hydrolyzed polyvinyl acetates or polyethylene oxide / vinyl acetate graft polymers. In general, the substrate layers are 0.2 to 25 microns thick, preferably, the thickness is 2 to 20 microns.
- the flexographic printing element used as the starting material can be protected against damage by a protective film, for example a protective film made of PET, which is located on the respectively uppermost layer of the flexographic printing element, that is to say generally on the substrate layer. If the photosensitive flexographic printing element has a protective film, it must be stripped off before carrying out the process according to the invention.
- the preparation of the flexographic printing element according to the invention offers no particular features and can be carried out by kneading the components and forming the layer by pressing, by extrusion and calendering between carrier film and cover film or by pouring on the dissolved components Layer on the dimensionally stable carrier er ⁇ follow.
- the flexographic printing element just disclosed is intended for conventional imaging by means of photographic masks.
- it may also be a digitally imageable flexographic printing element.
- the flexographic printing element has an additional digitally imageable layer. This can be located on the transparent substrate layer, but it is possible to dispense with the existence of digitally imageable layers but also the substrate layer, so that the digitally imageable layer is located directly on the photopolymerizable layer.
- the digitally imageable layer is preferably a layer selected from the group of IR-ablative layers, ink-jet layers or thermographic layers.
- IR ablative layers or masks are opaque to the wavelength of the actinic light and usually comprise a film-forming thermally decomposable binder and at least one IR absorber such as carbon black. Soot also ensures that the layer is opaque. Suitable binders are both organically soluble binders such as, for example, polyamides or nitrocellulose and also water-soluble binders, for example polyvinyl alcohol or polyvinyl alcohol / polyethylene glycol graft copolymers.
- a mask can be inscribed by means of an IR laser, i. the layer is decomposed and eroded where it is struck by the laser beam. Through the resulting mask can be irradiated imagewise with actinic light. Examples of the illustration of flexographic printing elements with IR-ablative masks are disclosed, for example, in EP-A 654 150 or EP-A 1 069 475.
- ink-jet layers a transparent layer which can be described with ink-jet inks, for example a gelatin layer, is applied. This is printable by ink-jet printing with opaque inks. Examples are disclosed in EP-A 1 072 953.
- Thermographic layers are transparent layers which contain substances that turn black under the influence of heat.
- Such layers comprise, for example, a binder and an inorganic or organic silver salt and can be imaged by means of a printer with a thermal head. Examples are disclosed in EP-A 1 070 989.
- the digitally imageable layer can also be a so-called peel-off layer, as disclosed, for example, by EP-A 654 151.
- the digitally imageable layers can be cast on the photopolymerizable layer or the substrate layer in a manner known in principle.
- the flexographic printing element is used as the starting material. If the flexographic printing element comprises a protective film, this is first removed.
- the photopolymerizable relief-forming layer is first exposed imagewise by means of actinic radiation.
- a photographic mask is applied for imaging the relief-forming layer in method step (a). Subsequently, the flexographic printing element is exposed through the applied mask with actinic light.
- UVA or UVA / VIS radiation is suitable in a known manner as actinic, ie chemically "effective" light.
- the irradiation causes the polymerizable layer to be crosslinked in the uncovered areas Edition of the photographic negative, the exposure can be made in be ⁇ known manner using a vacuum frame or under a glass plate.
- the flexographic printing element can optionally be irradiated with actinic light from the rear side in an (a) preceding process step.
- the relief depth can be set was ⁇ and he contributes to a better anchoring of the relief elements.
- step (a) the digitally imageable layer is imaged by means of the respective necessary technique, and thus a mask is generated virtually in situ on the relief-forming layer.
- An IR-ablative layer is removed imagewise using an IR laser. In this case, those areas are exposed that are to be networked later and form the relief elements.
- the digitally imageable layer is printed by means of ink-jet or thermographic printers in those areas which are not to be crosslinked in the course of the irradiation.
- actinic light is irradiated as in the case of using a photographic mask.
- a Vaku ⁇ umrahmen for exposure is not required.
- exposure is effected by means of a flat bed exposer in air.
- the flexographic printing element is developed with a suitable Auswasch ⁇ medium.
- the unexposed, i. the areas of the relief layer covered by the mask are removed, while the exposed, i. the networked areas are preserved.
- the crosslinked area is not dissolved, it nevertheless swells in the washout agent.
- washout agents for flexographic printing plates which usually consist of mixtures of various solvents which interact in a suitable manner.
- it is an organic or aqueous leaching agent.
- organic washout agents include washout agents from naphthenic or aromatic petroleum fractions mixed with alcohols, for example benzyl alcohol or cyclohexanol, and optionally further components, for example alicyclic hydrocarbons, terpene hydrocarbons, substituted benzenes, for example diisopropylbenzene, or dipropylene glycol dimethyl ether , Suitable washout agents are disclosed, for example, in EP-A 332 070 or EP-A 433 374.
- the washing out process can be carried out, for example, in a manner known in principle by means of a brush washer. Of course, other devices can be used.
- the washing can be carried out at room temperature or at elevated temperatures, for example at temperatures of 30 to 60 ° C.
- a digitally imageable flexographic printing element If a digitally imageable flexographic printing element has been used, the remainders of it can also be removed in the washout step. However, it is also possible to remove the remainders of the digitally imageable layer first with an upstream step with another washout agent and only then to develop the relief-forming layer.
- the washed-out flexographic printing plate is dried.
- the drying takes place essentially with radiation in the VIS / NIR range.
- the term "essentially with radiation in the VIS / NIR range" in the sense of this invention is intended to mean that the introduction of energy for drying should take place primarily with the aid of radiation.
- the radiation is absorbed among other things by the added dye. Of course, other components of the layer can also absorb the radiation. As a result, energy is introduced substantially uniformly into the entire relief layer.
- the energy input follows a completely different mechanism.
- the surface of the flexographic printing plate is heated by means of a warm air stream and optionally supported by long-wave IR radiation. From the surface, the heat is introduced by dissipation into the entire relief layer. Since the thermal conductivity of polymers is comparatively poor, this process lasts accordingly.
- the essential part should be registered by radiation in the VIS / NIR range.
- not more than 30% of the energy, particularly preferably not more than 20%, of the energy is absorbed by means of dissipation.
- the VIS / NIR radiation used for drying is "cold" radiation, ie radiation which has only small amounts of long-wave IR radiation. ⁇ br /> Under radiation in the VIS / NIR range for the purposes of this invention, radiation is to be used in the The skilled person is aware that, due to the breadth of the radiation spectra of conventional emitters, certain proportions of the radiation may also lie outside the ranges mentioned. As a rule, at least 70%, preferably 80%, should be used.
- the radiation maximum of the radiation used is generally not more than 1600 nm, preferably not more than 1300 nm.
- the radiation range is preferably 450 to 2000 nm, more preferably 500 to 1700 nm.
- the limitation to the desired spectral range can be achieved by using appropriate light sources, which preferably emit in the desired spectral range.
- appropriate light sources which preferably emit in the desired spectral range.
- radiation sources with a higher proportion of long-wave IR radiation and to filter out the portions of long-wave IR radiation with the aid of suitable filters and / or coolants from the spectrum.
- one or more radiation sources can be installed in a glass tube in which additionally circulates a coolant which is permeable to NIR or VIS radiation.
- Lamp with a high proportion of NIR-radiation and a radiation maximum in the NIR range are commercially available (eg. B. Noble Light ® or Infra Light ®, Fa. Heraeus).
- the surface of the radiator is much cooler than with conventional radiators. With the help of cold radiation, the relief layer can be effectively heated, quasi "from the inside out”.
- emitters which have a radiation maximum in the VIS range, that is to say between 400 nm to 700 nm, preferably 500 to 700 nm.
- a suitable drying unit may, for example, consist of a chamber into which the swollen flexographic printing plate is inserted and through which a purge gas stream flows.
- Suitable radiation sources can be mounted inside the chamber above the relief layer. Of course, other constructions are possible.
- the flexographic printing plate may also be subjected to customary aftertreatment steps, such as detackification by UV-C radiation.
- the drying time can be effectively shortened even by thicker flexographic printing plates. Even plates with a thickness of approx. 5 mm can be dried in less than 30 minutes. As a result, a much faster processing of print jobs using flexographic printing is possible.
- Fig 1 Structure of the azo dye used The dye was dissolved in toluene in a concentration of 1 mmol / l. Subsequently, the UV / VI S absorption spectrum was determined by means of a photometer (cuvette diameter 1 cm). The absorption spectrum is shown in Figure 2.
- the maximum in the wavelength range between 300-400 nm is 308 nm, the absorption here is 0.17.
- the differentiation factor DF is therefore 3.4.
- extrusion three printing plates of thickness 4.70 mm were prepared.
- the extrusion plant used was a twin-screw extruder (ZSK 53, Werner & Pfleiderer) at a throughput of 30 kg / h.
- the calendering was effected between two calender rolls to 90 0 C heated, where the led over the upper calender roll the carrier foil and the lower calender roll, the cover element.
- the green sheets prepared were exposed with a checkerboard pattern and a round brush washer FV (Fa. BASF Drucksysteme GmbH) by means of a kon ⁇ tional organic washing agent for flexographic printing plates washed (nylosolv A ®, BASF Drucksysteme GmbH).
- a conventional flexo dryer was modified.
- the air flow used was not warmed up as usual, but in the drying chamber several commercial NIR emitters were parallel to each other with a Strahlungsmaxi ⁇ mum installed at about 1000 nm (Hereaus InfraLight ® emitters, each about 60 cm in length), which the Flexo réellefomn heated from above by means of radiation.
- the drying rate was determined by measuring the change in layer thickness (measure of re-drying) of the clichés produced at different times after the onset of drying.
- Table 1 Layer thickness change in ⁇ m of the plate during washing and drying in relation to the thickness of the exposed plate.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
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- Printing Methods (AREA)
- Printing Plates And Materials Therefor (AREA)
Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102004057293A DE102004057293A1 (en) | 2004-11-26 | 2004-11-26 | Process for the production of flexographic printing plates and suitable flexographic printing element |
PCT/EP2005/012524 WO2006056413A2 (en) | 2004-11-26 | 2005-11-23 | Method for producing flexographic printing forms and appropriate flexographic printing element |
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EP1815297A2 true EP1815297A2 (en) | 2007-08-08 |
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EP05807853A Withdrawn EP1815297A2 (en) | 2004-11-26 | 2005-11-23 | Method for producing flexographic printing forms and appropriate flexographic printing element |
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US (1) | US20080257185A1 (en) |
EP (1) | EP1815297A2 (en) |
JP (1) | JP2008522203A (en) |
DE (1) | DE102004057293A1 (en) |
WO (1) | WO2006056413A2 (en) |
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DE102006028640A1 (en) * | 2006-06-22 | 2008-01-03 | Flint Group Germany Gmbh | Photopolymerizable layer composite for the production of flexographic printing elements |
DE102007006378A1 (en) | 2007-02-08 | 2008-08-14 | Flint Group Germany Gmbh | Photopolymerizable cylindrical endless seamless flexographic printing elements and hard flexographic printing plates made therefrom |
DE102007018953A1 (en) * | 2007-04-21 | 2008-10-30 | Repro Heinatz Gmbh | Flexo printing plate for rotary printing press has flexo printing element with photopolymer coating on plastic foil, fixed to metal carrier fixable on printing carrier |
JP2014048517A (en) * | 2012-08-31 | 2014-03-17 | Asahi Kasei E-Materials Corp | Component for flexographic printing plate and flexographic printing plate |
US10025183B2 (en) * | 2014-01-22 | 2018-07-17 | Macdermid Graphics Solutions, Llc | Photosensitive resin composition |
JP6397194B2 (en) * | 2014-02-21 | 2018-09-26 | 旭化成株式会社 | Photosensitive resin composition for printing plate, photosensitive resin composition for printing plate, and printing plate |
NL2027002B1 (en) * | 2020-11-27 | 2022-07-04 | Flint Group Germany Gmbh | Photosensitive composition |
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BE793979A (en) * | 1972-01-15 | 1973-07-12 | Kalle Ag | PROCESS FOR PRODUCING CLICHES FOR FLAT PRINTING AND MATERIAL FOR SUCH CLICHES |
US4427759A (en) * | 1982-01-21 | 1984-01-24 | E. I. Du Pont De Nemours And Company | Process for preparing an overcoated photopolymer printing plate |
US4478931A (en) * | 1982-09-27 | 1984-10-23 | E. I. Du Pont De Nemours And Company | Precurled flexographic printing plate |
DE8810445U1 (en) * | 1988-08-18 | 1988-11-17 | Könings Elektronische Antriebstechnik und Industrieanlagenbau GmbH & Co. KG, 4060 Viersen | Burning tunnel kiln |
DE4004511A1 (en) * | 1990-02-14 | 1991-08-22 | Hoechst Ag | DEVICE FOR BURNING IN LIGHT SENSITIVE LAYERS DURING THE PRODUCTION OF PRINTING FORMS |
EP0509962A1 (en) * | 1991-04-15 | 1992-10-21 | Ciba-Geigy Ag | A process and an apparatus for producing a thin photoimageable coating on a metallic-layered substrate |
US6238837B1 (en) * | 1995-05-01 | 2001-05-29 | E.I. Du Pont De Nemours And Company | Flexographic element having an infrared ablatable layer |
DE60000470T2 (en) * | 1999-07-13 | 2004-05-06 | Basf Drucksysteme Gmbh | Flexographic printing element with a highly sensitive layer ablative by IR radiation |
JP4130325B2 (en) * | 2002-04-05 | 2008-08-06 | 旭化成ケミカルズ株式会社 | Manufacturing method of seamless sleeve printing plate |
JP2004163533A (en) * | 2002-11-11 | 2004-06-10 | Toyobo Co Ltd | Photosensitive resin layered body |
DE60330201D1 (en) * | 2003-08-13 | 2009-12-31 | Agfa Graphics Nv | Method of post-baking lithographic printing plates |
-
2004
- 2004-11-26 DE DE102004057293A patent/DE102004057293A1/en not_active Withdrawn
-
2005
- 2005-11-23 JP JP2007541829A patent/JP2008522203A/en active Pending
- 2005-11-23 US US11/720,301 patent/US20080257185A1/en not_active Abandoned
- 2005-11-23 WO PCT/EP2005/012524 patent/WO2006056413A2/en active Application Filing
- 2005-11-23 EP EP05807853A patent/EP1815297A2/en not_active Withdrawn
Non-Patent Citations (1)
Title |
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See references of WO2006056413A2 * |
Also Published As
Publication number | Publication date |
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DE102004057293A1 (en) | 2006-06-01 |
WO2006056413A2 (en) | 2006-06-01 |
WO2006056413A3 (en) | 2007-07-19 |
US20080257185A1 (en) | 2008-10-23 |
JP2008522203A (en) | 2008-06-26 |
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