EP0850781B1 - Process for adhering the edges of photopolymerizable printing plates or photopolymer printing forms for flexographic printing - Google Patents
Process for adhering the edges of photopolymerizable printing plates or photopolymer printing forms for flexographic printing Download PDFInfo
- Publication number
- EP0850781B1 EP0850781B1 EP97121811A EP97121811A EP0850781B1 EP 0850781 B1 EP0850781 B1 EP 0850781B1 EP 97121811 A EP97121811 A EP 97121811A EP 97121811 A EP97121811 A EP 97121811A EP 0850781 B1 EP0850781 B1 EP 0850781B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printing
- photopolymerizable
- molecular weight
- gap filling
- low molecular
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 13
- 239000000463 material Substances 0.000 claims description 30
- 239000000203 mixture Substances 0.000 claims description 22
- 150000001875 compounds Chemical class 0.000 claims description 15
- 229920002857 polybutadiene Polymers 0.000 claims description 9
- 150000003384 small molecules Chemical class 0.000 claims description 8
- 230000005855 radiation Effects 0.000 claims description 7
- 229920001577 copolymer Polymers 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 3
- 150000001252 acrylic acid derivatives Chemical class 0.000 claims description 3
- 150000002148 esters Chemical class 0.000 claims description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- 150000001298 alcohols Chemical class 0.000 claims description 2
- 238000009835 boiling Methods 0.000 claims 2
- 150000002734 metacrylic acid derivatives Chemical class 0.000 claims 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims 1
- KAKZBPTYRLMSJV-UHFFFAOYSA-N vinyl-ethylene Natural products C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims 1
- 229920001400 block copolymer Polymers 0.000 description 9
- 239000004793 Polystyrene Substances 0.000 description 8
- 239000000976 ink Substances 0.000 description 8
- 229920002223 polystyrene Polymers 0.000 description 8
- FIHBHSQYSYVZQE-UHFFFAOYSA-N 6-prop-2-enoyloxyhexyl prop-2-enoate Chemical compound C=CC(=O)OCCCCCCOC(=O)C=C FIHBHSQYSYVZQE-UHFFFAOYSA-N 0.000 description 5
- 239000003999 initiator Substances 0.000 description 5
- 239000005062 Polybutadiene Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- FQKSRGCBHCFRTN-UHFFFAOYSA-N (4-nonylphenyl) prop-2-enoate Polymers CCCCCCCCCC1=CC=C(OC(=O)C=C)C=C1 FQKSRGCBHCFRTN-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- VVBLNCFGVYUYGU-UHFFFAOYSA-N 4,4'-Bis(dimethylamino)benzophenone Chemical compound C1=CC(N(C)C)=CC=C1C(=O)C1=CC=C(N(C)C)C=C1 VVBLNCFGVYUYGU-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- QRWAIZJYJNLOPG-UHFFFAOYSA-N (2-oxo-1,2-diphenylethyl) acetate Chemical compound C=1C=CC=CC=1C(OC(=O)C)C(=O)C1=CC=CC=C1 QRWAIZJYJNLOPG-UHFFFAOYSA-N 0.000 description 1
- HSKPJQYAHCKJQC-UHFFFAOYSA-N 1-ethylanthracene-9,10-dione Chemical compound O=C1C2=CC=CC=C2C(=O)C2=C1C=CC=C2CC HSKPJQYAHCKJQC-UHFFFAOYSA-N 0.000 description 1
- KWVGIHKZDCUPEU-UHFFFAOYSA-N 2,2-dimethoxy-2-phenylacetophenone Chemical compound C=1C=CC=CC=1C(OC)(OC)C(=O)C1=CC=CC=C1 KWVGIHKZDCUPEU-UHFFFAOYSA-N 0.000 description 1
- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 description 1
- IGRIPYOESCVPCX-UHFFFAOYSA-N 2-hexoxyethyl prop-2-enoate Chemical compound CCCCCCOCCOC(=O)C=C IGRIPYOESCVPCX-UHFFFAOYSA-N 0.000 description 1
- VZMLJEYQUZKERO-UHFFFAOYSA-N 2-hydroxy-1-(2-methylphenyl)-2-phenylethanone Chemical compound CC1=CC=CC=C1C(=O)C(O)C1=CC=CC=C1 VZMLJEYQUZKERO-UHFFFAOYSA-N 0.000 description 1
- JHWGFJBTMHEZME-UHFFFAOYSA-N 4-prop-2-enoyloxybutyl prop-2-enoate Chemical compound C=CC(=O)OCCCCOC(=O)C=C JHWGFJBTMHEZME-UHFFFAOYSA-N 0.000 description 1
- SAPGBCWOQLHKKZ-UHFFFAOYSA-N 6-(2-methylprop-2-enoyloxy)hexyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCCCCOC(=O)C(C)=C SAPGBCWOQLHKKZ-UHFFFAOYSA-N 0.000 description 1
- LVGFPWDANALGOY-UHFFFAOYSA-N 8-methylnonyl prop-2-enoate Chemical compound CC(C)CCCCCCCOC(=O)C=C LVGFPWDANALGOY-UHFFFAOYSA-N 0.000 description 1
- DAKWPKUUDNSNPN-UHFFFAOYSA-N Trimethylolpropane triacrylate Chemical compound C=CC(=O)OCC(CC)(COC(=O)C=C)COC(=O)C=C DAKWPKUUDNSNPN-UHFFFAOYSA-N 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 150000001414 amino alcohols Chemical class 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 1
- 239000012965 benzophenone Substances 0.000 description 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- -1 for example Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229940086559 methyl benzoin Drugs 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XZHNPVKXBNDGJD-UHFFFAOYSA-N tetradecyl prop-2-enoate Chemical compound CCCCCCCCCCCCCCOC(=O)C=C XZHNPVKXBNDGJD-UHFFFAOYSA-N 0.000 description 1
- 238000012719 thermal polymerization Methods 0.000 description 1
- JSPLKZUTYZBBKA-UHFFFAOYSA-N trioxidane Chemical class OOO JSPLKZUTYZBBKA-UHFFFAOYSA-N 0.000 description 1
- 229920006305 unsaturated polyester Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F27/00—Devices for attaching printing elements or formes to supports
- B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
- B41F27/1293—Devices for filling up the cylinder gap; Devices for removing the filler
-
- 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
- B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising
- B41N6/02—Chemical means for fastening printing formes on mounting boards
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
- Y10S430/1053—Imaging affecting physical property or radiation sensitive material, or producing nonplanar or printing surface - process, composition, or product: radiation sensitive composition or product or process of making binder containing
- Y10S430/1055—Radiation sensitive composition or product or process of making
- Y10S430/106—Binder containing
- Y10S430/108—Polyolefin or halogen containing
Definitions
- the invention relates to a method for covering edges and / or filling openings or gaps that occur during application of photopolymerizable printing plates and Photopolymer printing forms for flexographic printing on one Printing cylinder are formed in which the edge covering or Gap filling material applied and by exposure to actinic radiation is cured.
- the photopolymerizable Printing plate exposed by an original the unexposed Areas are washed out with a solvent and if necessary there is a chemical aftertreatment and / or full-surface post-exposure. These treatment steps can if necessary also be carried out on the impression cylinder.
- Printing forms often composed of individual sections.
- the need for assembly can be be due to the motif to be printed or for reasons of Economy or to get larger plate formats.
- the printing plate or printing form is around the Printing cylinders laid around so that their ends meet. The fixation then takes place by means of gluing double sided tapes. Are made up of individual parts Printing forms are used, so the edges of the glued individual parts.
- gap filling materials often have too little Resistance to the ink solvents on and are the mechanical stresses caused by the printing process not grown. This causes cracks in the Gap filling material that can now take up printing ink again and thus leads to undesired printed images. That too is Applicability of the known gap filling materials often increases bad and cumbersome.
- the present invention was therefore based on the object To avoid disadvantages of the prior art and the Application of flexographic printing forms and plates occurring column flexible, reliable, quick and easy to close, the gap filling material being the same Color transfer should show like the printing form itself, so that Full areas can be printed more completely than before.
- the photopolymerizable materials according to the invention can therefore the gap between mounted on printing cylinders flexographic printing forms and the column between the Printing form edges and the printing cylinder surface flexible and be permanently closed. So the intrusion can of printing inks or their solvents prevented and that this causes detachment of the printing forms from Prevents printing cylinders during the printing process and the Synchronization properties can be improved. Likewise, Full areas printed more completely because of the gap filling material shows the same color transfer as the printing forms themselves.
- low molecular weight compounds in the photopolymerizable mixtures are the known mono- or polyunsaturated monomers such as Esters or amides of acrylic acid or methacrylic acid with mono- or polyfunctional alcohols, amines, amino alcohols or Hydroxyethers and esters used.
- the molecular weights these compounds are preferably ⁇ 800, particularly preferred 100 to 600.
- Mixtures of mono- and polyunsaturated compounds as described in DE-C1 37 44 243 and DE-A 36 30 474 are described.
- oligomeric compounds in the photopolymerizable mixtures generally known compounds such as, for example, acrylic ester-butadiene copolymers, methacrylic acid ester-butadiene copolymers, styrene-butadiene copolymers, 1,2- and 1,4-polybutadienes, acrylated polybutadienes, methacrylated polybutadienes, Polyisoprenes or derivatives of these oligomers can be used.
- Styrene-butadiene copolymers, (meth) acrylated polybutadienes and (meth) acrylic ester-butadiene copolymers are preferably used.
- the molecular weights (M n ) of the oligomeric compounds according to the invention are between 1000 and 10,000, preferably between 2000 and 5000.
- the photopolymerizable mixtures also contain one of the known photoinitiators or a Photoinitiator system, e.g. Methylbenzoin, benzoin acetate, Benzophenone, benzil dimethyl ketal, ethyl anthraquinone / 4,4'-bis (dimethylamino) benzophenone.
- a Photoinitiator system e.g. Methylbenzoin, benzoin acetate, Benzophenone, benzil dimethyl ketal, ethyl anthraquinone / 4,4'-bis (dimethylamino) benzophenone.
- the weight ratio of the low molecular weight compounds to the oligomeric compounds in the invention photopolymerizable mixtures is ⁇ 2: 1, preferably ⁇ 2.5: 1, particularly preferably 2.5: 1 to 4: 1, in particular 2.8: 1 to 3.5: 1.
- the photopolymerizable mixtures according to the invention also contain 0.5 - 5 wt .-% initiator. Up to 10% by weight other aids such as Fillers, binders, Dyes, antioxidants, antiozonants, thermal Polymerization inhibitors and plasticizers can be contained in the mixtures. In particular up to 10% by weight, preferably 1-8% by weight, particularly preferably 1-6% by weight, binders can be added.
- Preferred Binders are those that are used with the binders Printing plates are compatible.
- thermoplastic elastomeric block copolymers In particular linear and / or radial polystyrene-polybutadiene-polystyrene or polystyrene-polyisoprene-polystyrene block copolymers and Styrene / butadiene copolymers are suitable. To be favoured Polystyrene-polybutadiene-polystyrene block copolymers are used. Solvents are for the applicability of the invention Mixtures are not necessary.
- the introduction of the gap filling materials into the closing column is carried out with the specialist familiar Methods, preferably by injecting using disposable syringes or injection pistols, as it is also in DE-B 36 00 774 and GB-B 2,160,882. Corresponding smooth Precision bevel cuts on the edge of the printing forms or -Plates are not necessary.
- Gap filling materials are made by exposure to actinic Radiation of any kind.
- Suitable radiation sources for this are, for example, mercury vapor lamps, incandescent lamps special phosphors that emit ultraviolet light, Argon light bulbs and photo lamps.
- the most suitable of these are the mercury vapor lamps, in particular Ultraviolet light lamps and UV fluorescent lamps.
- the gap filling material is hardened and the Printing forms are connected so that the filled gap has the same printing properties as the printing plate material and continuous printing can be done.
- a commercially available Cyrel® PLS flexographic printing plate from DuPont was exposed, developed as described in DE-B 36 00 774, and mounted on a printing cylinder using double-sided adhesive tape.
- the gap occurring at the abutting edges (1 - 3 mm) was sealed with UV-permeable adhesive tape and with a photopolymerizable mixture according to the invention consisting of 46% lauryl acrylate, 19% polyethoxylated 4-nonylphenol acrylate (4 mol ethylene oxide), 5.8% hexamethylene glycol diacrylate, 23.2% polybutadiene methacrylate ( M n 3000-4000), 4% of a polystyrene-polybutadiene-polystyrene block copolymer (Mw 130,000), 1.5% initiator and 0.5% inhibitor.
- the viscosity of the mixture was 360 cPs. After full-surface exposure with a commercially available Cyrel® printing plate exposure device, the gap filling material showed
- Printing tests were carried out with the printing cylinder thus produced 100 and 200 m / min performed.
- the gap filling material was stable against the inks and showed a good Color transfer that corresponded to that of the printing form.
- an above-mentioned printing plate was processed and the gap was coated with a photopolymerizable mixture according to the invention of 44% lauryl acrylate, 20% polyethoxylated 4-nonylphenol acrylate (4 mol ethylene oxide), 6.5% hexamethylene glycol diacrylate, 24% polybutadiene methacrylate (M n 3000 - 4000), 4% of a polystyrene-polyisoprene-polystyrene block copolymer (M w 130,000 to 150,000), 1.0% initiator and 0.5% inhibitor sealed.
- the viscosity of the mixture was 390 cPs.
- the gap filling material After full-surface exposure with a commercially available Cyrel® printing plate exposure device, the gap filling material showed a hardness of 67 Shore A and a rebound resilience of 34.8%.
- Printing tests were carried out with the printing cylinder thus produced 100 and 200 m / min performed.
- the gap filling material was stable against the inks and showed a good Color transfer that corresponded to that of the printing form.
- an above-mentioned. printing plate processed and the gap with a photopolymerizable Mixture of 92.5% polyethoxylated 4-nonylphenol acrylate (4th Mol ethylene oxide), 1.5% hexamethylene glycol diacrylate, 5% one Polystyrene-polybutadiene-polystyrene block copolymers (Mw 130 000) and 1.0% initiator closed.
- the viscosity of the The mixture was 230 cPs.
- the gap filling material showed a hardness of 42 Shore A and a rebound resilience of 18.0%. No usable impression cylinder was obtained because that Gap filling material stuck to the adhesive tape.
- an abovementioned printing plate was processed and the gap was coated with a photopolymerizable mixture of 27% lauryl acrylate, 15% hexamethylene glycol diacrylate, 38% polybutadiene methacrylate (M n 3000 - 4000), 19% of a 1.4 polybutadiene (melting temperature approx. - 50 ° C) and 1.0% initiator closed.
- the viscosity of the mixture was 749 cps.
- the gap filling material After full-surface exposure with a commercially available Cyrel® printing plate exposure device, the gap filling material showed a hardness of 80 Shore A and a rebound resilience of 31%. A usable impression cylinder was not obtained because the photopolymerizable gap filling material was inhomogeneous and the exposed material was too hard.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Printing Plates And Materials Therefor (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
- Sealing Material Composition (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Abdecken von Kanten und/oder Füllen von Öffnungen bzw. Spalte, die beim Aufbringen von photopolymerisierbaren Druckplatten und Photopolymerdruckformen für den Flexodruck auf einen Druckzylinder gebildet werden, bei dem das Kantenabdeck- bzw. Spaltfüllmaterial aufgebracht und durch Belichtung mit aktinischer Strahlung gehärtet wird.The invention relates to a method for covering edges and / or filling openings or gaps that occur during application of photopolymerizable printing plates and Photopolymer printing forms for flexographic printing on one Printing cylinder are formed in which the edge covering or Gap filling material applied and by exposure to actinic radiation is cured.
Es ist bekannt, für die Herstellung von flexographischen Druckformen photopolymerisierbare Druckplatten zu verwenden, bei denen die Druckoberfläche durch bildmäßiges Belichten einer durch aktinische Strahlung photopolymerisierbaren Schicht und anschließendes Entfernen der unbelichteten, nicht photopolymerisierten Druckplattenbereiche erzeugt wird. Beispiele hierfür finden sich in den folgenden Patenten: DE-C 22 15 090, US-A 4,266,005; US-A 4,320,188; US-A 4,126,466 und US-A 4,430,417.It is known for the production of flexographic Use printing formes of photopolymerizable printing plates, where the printing surface by imagewise exposure one photopolymerizable by actinic radiation Layer and then removing the unexposed, not photopolymerized printing plate areas is generated. Examples of this can be found in the following patents: DE-C 22 15 090, U.S. 4,266,005; US-A 4,320,188; US-A 4,126,466 and US-A 4,430,417.
Zur Herstellung der Druckform wird die photopolymerisierbare Druckplatte durch eine Vorlage belichtet, die unbelichteten Bereiche werden mit einem Lösemittel ausgewaschen und ggf. erfolgt eine chemische Nachbehandlung und/oder eine vollflächige Nachbelichtung. Diese Behandlungsschritte können ggf. auch auf dem Druckzylinder durchgeführt werden.To produce the printing form, the photopolymerizable Printing plate exposed by an original, the unexposed Areas are washed out with a solvent and if necessary there is a chemical aftertreatment and / or full-surface post-exposure. These treatment steps can if necessary also be carried out on the impression cylinder.
Zum Drucken wird die Photopolymerflexodruckform oder, falls die Druckform auf dem Druckzylinder erzeugt wird, die photopolymerisierbare Druckplatte auf dem Druckzylinder oder auf einem Endlosband montiert. In der Praxis werden Druckformen häufig aus einzelnen Teilstücken zusammengesetzt. Die Notwendigkeit des Zusammensetzens kann beispielweise bedingt sein durch das zu druckende Motiv oder aus Gründen der Wirtschaftlichkeit oder um größere Plattenformate zu erhalten. Für eine Reihe von Anwendungszwecken ist es außerdem erforderlich, den Druckzylinder endlos mit der Druckform zu belegen. Hierzu wird die Druckplatte bzw. Druckform so um den Druckzylinder herumgelegt, daß ihre Enden aneinander stoßen. Die Fixierung erfolgt dann durch Verkleben mittels doppelseitiger Klebebänder. Werden aus Einzelteilen bestehende Druckformen verwendet, so werden auch hier die Kanten der einzelnen Teilestücke verklebt.For printing, the photopolymer flexographic printing plate or, if the printing form is generated on the impression cylinder, the photopolymerizable printing plate on the printing cylinder or mounted on an endless belt. Be in practice Printing forms often composed of individual sections. For example, the need for assembly can be be due to the motif to be printed or for reasons of Economy or to get larger plate formats. It is also for a number of applications required to press the printing cylinder endlessly with the printing form occupy. For this purpose, the printing plate or printing form is around the Printing cylinders laid around so that their ends meet. The fixation then takes place by means of gluing double sided tapes. Are made up of individual parts Printing forms are used, so the edges of the glued individual parts.
Zwischen den aneinanderstoßenden Kanten der aufgebrachten Flexodruckformen entstehen so Spalte, die eine Unterbrechung der Druckoberfläche darstellen. Solche Spalte müssen in geeigneter Weise verschlossen werden, um ein Eindringen von Druckfarbe während des Druckvorgangs zu verhindern, was zum Lösen der Verklebungen der Druckformen und zum unerwünschten Abdrucken der Spalte führen würde. Das Verschließen der Spalte ist auch für gute Gleichlaufeigenschaften des Druckzylinders erforderlich, die bei einem offenen Spalt nicht gegeben sind.Between the abutting edges of the applied Flexographic printing forms thus create gaps that are an interruption the print surface. Such columns must be in appropriately sealed to prevent intrusion To prevent ink during printing, resulting in Detachment of the printing forms and to the undesirable Printing the column would result. Closing the column is also for good synchronization properties of the impression cylinder required, which are not given with an open gap.
Auch zwischen den Seitenbereichen der Druckformen und der Druckzylinderoberfläche können Spalte enstehen, die gegen das Eindringen von Druckfarbe abgedichtet sein müssen.Also between the side areas of the printing forms and the Impression cylinder surface can arise, which against the Penetration of printing ink must be sealed.
Verschiedene Spaltfüllmaterialien sind schon vorgeschlagen worden. So sind aus der DE-B 36 00 774 und der DE-B 37 44 243 photopolymerisierbare Gemische mit speziellen thermoplastisch elastomeren Blockcopolymeren als Hauptkomponente und aus der GB-B 2,160,882 solche mit 100 Teilen eines Prepolymeren vom Dientyp und 5 - 100 Teilen einer ethylenisch ungesättigten Verbindung bekannt, die in die Spalten eingebracht und durch Bestrahlung gehärtet werden. Auch photopolymerisierbare Gemische mit ungesättigten Polyestern (DE-A 39 20 093) und oxidischen Füllern (DE-A 37 36 180) als wesentliche Bestandteile werden zum Verschließen der bei Tiefdruckformen auftretenden Spalten verwendet. Various gap filling materials have already been proposed been. So are from DE-B 36 00 774 and DE-B 37 44 243 photopolymerizable mixtures with special thermoplastic elastomeric block copolymers as the main component and from the GB-B 2,160,882 those with 100 parts of a prepolymer from Serve type and 5 - 100 parts of an ethylenically unsaturated Known connection, which is introduced into the columns and through Radiation can be cured. Also photopolymerizable Mixtures with unsaturated polyesters (DE-A 39 20 093) and oxidic fillers (DE-A 37 36 180) as essential Components are used to seal the gravure forms occurring columns used.
Diese Spaltfüllmaterialien weisen aber häufig eine zu geringe Beständigkeit gegenüber den Druckfarbenlösemitteln auf und sind den mechanischen Beanspruchungen durch den Druckprozeß nicht gewachsen. Dies verursacht Risse in dem Spaltfüllmaterial, das nun wieder Druckfarbe aufnehmen kann und so zu unerwünschten Druckbildern führt. Auch ist die Applizierbarkeit der bekannten Spaltfüllmaterialien häufig zu schlecht und umständlich.However, these gap filling materials often have too little Resistance to the ink solvents on and are the mechanical stresses caused by the printing process not grown. This causes cracks in the Gap filling material that can now take up printing ink again and thus leads to undesired printed images. That too is Applicability of the known gap filling materials often increases bad and cumbersome.
Der vorliegenden Erfindung lag daher die Aufgabe zugrunde, die Nachteile des Standes der Technik zu vermeiden und die beim Aufbringen von flexographischen Druckformen und -platten auftretenden Spalte flexibel, zuverlässig, schnell und einfach zu verschließen, wobei das Spaltfüllmaterial die gleiche Farbübertragung zeigen soll wie die Druckform selbst, so daß Vollflächen vollständiger als bisher gedruckt werden können.The present invention was therefore based on the object To avoid disadvantages of the prior art and the Application of flexographic printing forms and plates occurring column flexible, reliable, quick and easy to close, the gap filling material being the same Color transfer should show like the printing form itself, so that Full areas can be printed more completely than before.
Diese Aufgabe wurde überraschenderweise gelöst durch ein Verfahren zum Abdecken von Kanten und/oder Füllen von Öffnungen bzw. Spalte, die beim Aufbringen von photopolymerisierbaren Druckplatten und Druckformen für den Flexodruck auf einen Druckzylinder gebildet werden, bei dem das Kantenabdeck- bzw. Spaltfüllmaterial aufgebracht und durch Belichtung mit aktinischer Strahlung gehärtet wird,dadurch gekennzeichnet, daß als Kantenabdeck- und/oder Spaltfüllmaterial ein photopolymerisierbares Gemisch enthaltend mindestens eine photopolymerisierbare, ethylenisch ungesättigte niedermolekulare Verbindung, mindestens eine photopolymerierbare, ethylenisch ungesättigte oligomere Verbindung und mindestens einen Photoinitiator oder ein Photoinitiatorsystem verwendet wird, wobei das Gewichtsverhältnis der niedermolekularen Verbindung zur oligomeren Verbindung ≥ 2:1 ist.This task was surprisingly solved by a Process for covering edges and / or filling Openings or gaps that occur when applying photopolymerizable printing plates and printing forms for the Flexographic printing are formed on a printing cylinder in which the edge covering or gap filling material applied and through Exposure to actinic radiation is hardened thereby characterized in that as edge covering and / or Gap filling material a photopolymerizable mixture containing at least one photopolymerizable, ethylenically unsaturated low molecular compound, at least one photopolymerizable, ethylenically unsaturated oligomers Compound and at least one photoinitiator or one Photoinitiatorsystem is used, the Weight ratio of the low molecular weight compound to oligomeric compound is ≥ 2: 1.
Überraschenderweise wird durch den Einsatz der erfindungsgemäßen photopolymerisierbaren Gemische die Beständigkeit von Kantenabdeck- und Spaltfüllmaterialien gegenüber Druckfarben gesteigert und das Aufbringen und die Verarbeitung dieser Materialien sind einfach und von gleichbleibender Qualität.Surprisingly, by using the photopolymerizable mixtures according to the invention Resistance of edge covering and gap filling materials compared to printing inks and the application and the Processing of these materials are simple and of consistent quality.
Mit den erfindungsgemäßen photopolymerisierbaren Materialien können daher die Spalte zwischen auf Druckzylindern montierten flexographischen Druckformen und die Spalte zwischen den Druckformenrändern und der Druckzylinderoberfläche flexibel und dauerhaft verschlossen werden. Somit kann das Eindringen von Druckfarben bzw. deren Lösungsmitteln verhindert und das hierdurch hervorgerufene Ablösen der Druckformen vom Druckzylinder während des Druckprozesses verhindert und die Gleichlaufeigenschaften verbessert werden. Ebenso werden Vollflächen vollständiger gedruckt, da das Spaltfüllmaterial die gleiche Farbübertragung zeigt wie die Druckformen selbst.With the photopolymerizable materials according to the invention can therefore the gap between mounted on printing cylinders flexographic printing forms and the column between the Printing form edges and the printing cylinder surface flexible and be permanently closed. So the intrusion can of printing inks or their solvents prevented and that this causes detachment of the printing forms from Prevents printing cylinders during the printing process and the Synchronization properties can be improved. Likewise, Full areas printed more completely because of the gap filling material shows the same color transfer as the printing forms themselves.
Als ethylenisch ungesättigte, niedermolekulare Verbindungen in den photopolymerisierbaren Gemischen werden die bekannten einfach oder mehrfach ungesättigten Monomere wie z.B. Ester oder Amide der Acrylsäure oder Methacrylsäure mit mono- oder polyfunktionellen Alkoholen, Aminen, Aminoalkoholen oder Hydroxyethern und -estern eingesetzt. Die Molekulargewichte dieser Verbindungen sind bevorzugt < 800, besonders bevorzugt 100 bis 600. Geeignet sind auch Mischungen aus mono- und polyungesättigten Verbindungen wie sie in der DE-C1 37 44 243 und der DE-A 36 30 474 beschrieben werden. Als Beispiele für die additionspolymersierbaren Verbindungen seien genannt: Butylacrylat, Isodecylacrylat, Tetradecylacrylat, Laurylacrylat, polyoxyethylierte (Meth)acrylate wie z. B. Polyoxyethylen-4-nonylphenolacrylat, 2-Hexyloxyethylacrylat, 1,4-Butandioldiacrylat, 1,6-Hexandioldimethacrylat, 1,6-Hexandioldiacrylat, Trimethylolpropantriacrylat und Dipentaerythritolmonohydroxypentacrylat.As ethylenically unsaturated, low molecular weight compounds in the photopolymerizable mixtures are the known mono- or polyunsaturated monomers such as Esters or amides of acrylic acid or methacrylic acid with mono- or polyfunctional alcohols, amines, amino alcohols or Hydroxyethers and esters used. The molecular weights these compounds are preferably <800, particularly preferred 100 to 600. Mixtures of mono- and polyunsaturated compounds as described in DE-C1 37 44 243 and DE-A 36 30 474 are described. As examples of the addition polymerizable compounds are mentioned: Butyl acrylate, isodecyl acrylate, tetradecyl acrylate, Lauryl acrylate, polyoxyethylated (meth) acrylates such as e.g. B. Polyoxyethylene-4-nonylphenol acrylate, 2-hexyloxyethyl acrylate, 1,4-butanediol diacrylate, 1,6-hexanediol dimethacrylate, 1,6-hexanediol diacrylate, Trimethylolpropane triacrylate and Dipentaerythritol monohydroxypentacrylate.
Als ethylenisch ungesättigte, oligomere Verbindungen können in den photopolymerisierbaren Gemischen allgemein bekannte Verbindungen wie z.B. Acrylsäureester-Butadien-Copolymere, Methacrylsäurester-Butadien-Copolymere, Styrol-Butadien-Copolymere, 1,2- und 1,4 Polybutadiene, acrylierte Polybutadiene, methacrylierte Polybutadiene, Polyisoprene oder Derivate dieser Oligomere eingesetzt werden. Bevorzugt werden Styrol-Butadien-Copolymere, (meth)acrylierte Polybutadiene und (Meth)acrylsäureester-Butadien-Copolymere verwendet. Die Molekulargewichte (Mn) der erfindungsgemäßen oligomeren Verbindungen liegen zwischen 1000 und 10 000, bevorzugt zwischen 2000 und 5000.As ethylenically unsaturated, oligomeric compounds in the photopolymerizable mixtures, generally known compounds such as, for example, acrylic ester-butadiene copolymers, methacrylic acid ester-butadiene copolymers, styrene-butadiene copolymers, 1,2- and 1,4-polybutadienes, acrylated polybutadienes, methacrylated polybutadienes, Polyisoprenes or derivatives of these oligomers can be used. Styrene-butadiene copolymers, (meth) acrylated polybutadienes and (meth) acrylic ester-butadiene copolymers are preferably used. The molecular weights (M n ) of the oligomeric compounds according to the invention are between 1000 and 10,000, preferably between 2000 and 5000.
Desweiteren enthalten die photopolymerisierbaren Gemische einen der bekannten Photoinitiatoren oder ein Photoinitiatorsystem, z.B. Methylbenzoin, Benzoinacetat, Benzophenon, Benzil-dimethyl-ketal, Ethylanthrachinon/4,4'-Bis-(dimethylamino)-benzophenon.The photopolymerizable mixtures also contain one of the known photoinitiators or a Photoinitiator system, e.g. Methylbenzoin, benzoin acetate, Benzophenone, benzil dimethyl ketal, ethyl anthraquinone / 4,4'-bis (dimethylamino) benzophenone.
Das Gewichtsverhältnis der niedermolekularen Verbindungen zu den oligomeren Verbindungen in den erfindungsgemäßen photopolymerisierbare Gemischen ist ≥ 2:1, bevorzugt ≥ 2.5:1, besonders bevorzugt 2.5:1 bis 4:1, insbesondere 2.8:1 bis 3.5:1. Die erfindungsgemäßen photopolymerisierbaren Gemische enthalten zudem 0,5 - 5 Gew.-% Initiator. Bis zu 10 Gew.-% weiterer Hilfsmittel wie z.B. Füllstoffe, Bindemittel, Farbstoffe, Antioxidantien, Ozonschutzmittel, thermische Polymerisationsinhibitoren und Plastifizierungsmittel können in den Gemischen enthalten sein. Insbesondere bis zu 10 Gew.-%, bevorzugt 1 - 8 Gew.-%, besonders bevorzugt 1 - 6 Gew.-%, an Bindemitteln können zugesetzt werden. Bevorzugte Bindemittel sind solche, die mit den Bindemitteln der Druckplatten kompatibel sind. Verwendet vwerden können z. B. thermoplastisch elastomere Blockcopolymere. Insbesondere lineare und/oder radiale Polystyrol-Polybutadien-Polystyrol- oder Polystyrol-Polyisopren-Polystyrol-Blockcopolymere und Styrol/Butadien Copolymere sind geeignet. Bevorzugt werden Polystyrol-Polybutadien-Polystyrol-Blockcopolymere verwendet. Lösemittel sind für die Applizierbarkeit der erfindungsgemäßen Gemische nicht notwendig.The weight ratio of the low molecular weight compounds to the oligomeric compounds in the invention photopolymerizable mixtures is ≥ 2: 1, preferably ≥ 2.5: 1, particularly preferably 2.5: 1 to 4: 1, in particular 2.8: 1 to 3.5: 1. The photopolymerizable mixtures according to the invention also contain 0.5 - 5 wt .-% initiator. Up to 10% by weight other aids such as Fillers, binders, Dyes, antioxidants, antiozonants, thermal Polymerization inhibitors and plasticizers can be contained in the mixtures. In particular up to 10% by weight, preferably 1-8% by weight, particularly preferably 1-6% by weight, binders can be added. Preferred Binders are those that are used with the binders Printing plates are compatible. Can be used e.g. B. thermoplastic elastomeric block copolymers. In particular linear and / or radial polystyrene-polybutadiene-polystyrene or polystyrene-polyisoprene-polystyrene block copolymers and Styrene / butadiene copolymers are suitable. To be favoured Polystyrene-polybutadiene-polystyrene block copolymers are used. Solvents are for the applicability of the invention Mixtures are not necessary.
Das Einbringen der Spaltfüllmaterialien in die zu verschließenden Spalte erfolgt mit dem Fachmann geläufigen Methoden, bevorzugt durch Einspritzen mittels Einmalspritzen oder Injektionspistolen, wie es auch in der DE-B 36 00 774 und der GB-B 2,160,882 beschrieben ist. Korrespondierende glatte Präzisionsschrägschnitte an den Kante der Druckformen bzw. -platten sind nicht notwendig.The introduction of the gap filling materials into the closing column is carried out with the specialist familiar Methods, preferably by injecting using disposable syringes or injection pistols, as it is also in DE-B 36 00 774 and GB-B 2,160,882. Corresponding smooth Precision bevel cuts on the edge of the printing forms or -Plates are not necessary.
Die Aushärtung der erfindungsgemäßen photopolymerisierbaren Spaltfüllmaterialien erfolgt durch Belichtung mit aktinische Strahlung beliebiger Art. Geeignete Strahlungsquellen hierfür sind beispielsweise Quecksilberdampflampen, Glühlampen mit speziellen Leuchtstoffen, die Ultraviolettlicht emittieren, Argonglühlampen und Fotolampen. Am geeignetsten hiervon sind die Quecksilberdampflampen, insbesondere Ultraviolettlichtlampen und UV-Leuchtstofflampen.The curing of the photopolymerizable according to the invention Gap filling materials are made by exposure to actinic Radiation of any kind. Suitable radiation sources for this are, for example, mercury vapor lamps, incandescent lamps special phosphors that emit ultraviolet light, Argon light bulbs and photo lamps. The most suitable of these are the mercury vapor lamps, in particular Ultraviolet light lamps and UV fluorescent lamps.
Auf diese Weise wird das Spaltfüllmaterial gehärtet und die Druckformen werden so verbunden, daß der gefüllte Spalt die gleichen Druckeigenschaften wie das Druckformmaterial aufweist und Endlosdrucke durchgeführt werden können.In this way, the gap filling material is hardened and the Printing forms are connected so that the filled gap has the same printing properties as the printing plate material and continuous printing can be done.
Mit den erfindungsgemäßen Spaltfüllmaterialien können alle bekannten flexographischen Druckformen und -platten, die auf Druckzylindern fixiert sind, behandelt werden. Die Zusammensetzung, Herstellung und Verarbeitung solcher Flexodruckformen und -platten ist dem Fachmann geläufig. Bevorzugt werden Flexodruckformen und -platten auf der Basis von thermoplastisch elastomeren Blockcopolymeren verwendet, insbesondere solche mit linearen und/oder radialen Polystyrol-Polybutadien-Polystyrol bzw. Polystyrol-Polyisopren-Polystyrol Blockcopolymeren. Solche Druckformen bzw. -platten und ihre Herstellung sind z. B. in der DE-B 22 15 090, der DE-B 37 44 243 und der EP-B 0 084 851 beschrieben.With the gap filling materials according to the invention, everyone can well-known flexographic printing plates and plates that are based on Printing cylinders are fixed, are treated. The Composition, manufacture and processing of such Flexographic printing plates and plates are familiar to the person skilled in the art. Flexographic printing plates and plates on the basis are preferred used by thermoplastic elastomeric block copolymers, in particular those with linear and / or radial polystyrene-polybutadiene-polystyrene or polystyrene-polyisoprene-polystyrene Block copolymers. Such printing forms or plates and their Manufacturing are e.g. B. in DE-B 22 15 090, DE-B 37 44 243 and EP-B 0 084 851.
Die folgenden Beispiele sollen die vorliegende Erfindung verdeutlichen. Die angegebenen Teile und Prozente beziehen sich, falls nichts anderes angegeben ist, auf das Gewicht. The following examples are intended to illustrate the present invention clarify. Obtain the specified parts and percentages unless otherwise stated, the weight.
Eine handelsübliche Flexodruckplatte Cyrel® PLS der Firma DuPont wurde wie in der DE-B 36 00 774 beschrieben belichtet, entwickelt und mit doppelseitigem Klebeband auf einem Druckzylinder montiert. Der an den Stoßkanten auftretende Spalt (1 - 3 mm) wurde mit UV-durchlässigem Klebeband verschlossen und mit einem erfindungsgemäßen photopolymerisierbaren Gemisch aus 46 % Laurylacrylat, 19 % polyethoxyliertes 4-Nonylphenolacrylat (4 Mol Ethylenoxid), 5.8 % Hexamethylenglykoldiacrylat, 23.2 % Polybutadienmethacrylat (Mn 3000 - 4000), 4 % eines Polystyrol-Polybutadien-Polystyrol Blockcopolymeren (Mw 130 000), 1,5 % Initiator und 0.5 % Inhibitor verschlossen. Die Viskosität des Gemischs betrug 360 cPs. Nach der vollflächigen Belichtung mit einem handelsüblichen Cyrel® Druckplattenbelichtungsgerät zeigte das Spaltfüllmaterial eine Härte von 65 Shore A und eine Rückprallelastizität von 38%.A commercially available Cyrel® PLS flexographic printing plate from DuPont was exposed, developed as described in DE-B 36 00 774, and mounted on a printing cylinder using double-sided adhesive tape. The gap occurring at the abutting edges (1 - 3 mm) was sealed with UV-permeable adhesive tape and with a photopolymerizable mixture according to the invention consisting of 46% lauryl acrylate, 19% polyethoxylated 4-nonylphenol acrylate (4 mol ethylene oxide), 5.8% hexamethylene glycol diacrylate, 23.2% polybutadiene methacrylate ( M n 3000-4000), 4% of a polystyrene-polybutadiene-polystyrene block copolymer (Mw 130,000), 1.5% initiator and 0.5% inhibitor. The viscosity of the mixture was 360 cPs. After full-surface exposure with a commercially available Cyrel® printing plate exposure device, the gap filling material showed a hardness of 65 Shore A and a rebound resilience of 38%.
Mit dem so hergestellten Druckzylinder wurden Drucktests bei 100 und 200 m/min durchgeführt. Das Spaltfüllmaterial war stabil gegenüber den Druckfarben und zeigte eine gute Farbübertragung, die der der Druckform entsprach.Printing tests were carried out with the printing cylinder thus produced 100 and 200 m / min performed. The gap filling material was stable against the inks and showed a good Color transfer that corresponded to that of the printing form.
Wie in Beispiel 1 beschrieben wurde eine o.g. Druckplatte verarbeitet und der Spalt mit einem erfindungsgemäßen photopolymerisierbaren Gemisch aus 44 % Laurylacrylat, 20 % polyethoxyliertes 4-Nonylphenolacrylat (4 Mol Ethylenoxid), 6.5 % Hexamethylenglykoldiacrylat, 24 % Polybutadienmethacrylat (Mn 3000 - 4000), 4 % eines Polystyrol-Polyisopren-Polystyrol Blockcopolymeren (Mw 130 000 bis 150 000), 1.0 % Initiator und 0.5 % Inhibitor verschlossen. Die Viskosität des Gemischs betrug 390 cPs. Nach der vollflächigen Belichtung mit einem handelsüblichen Cyrel® Druckplattenbelichtungsgerät zeigte das Spaltfüllmaterial eine Härte von 67 Shore A und eine Rückprallelastizität von 34.8%. As described in Example 1, an above-mentioned printing plate was processed and the gap was coated with a photopolymerizable mixture according to the invention of 44% lauryl acrylate, 20% polyethoxylated 4-nonylphenol acrylate (4 mol ethylene oxide), 6.5% hexamethylene glycol diacrylate, 24% polybutadiene methacrylate (M n 3000 - 4000), 4% of a polystyrene-polyisoprene-polystyrene block copolymer (M w 130,000 to 150,000), 1.0% initiator and 0.5% inhibitor sealed. The viscosity of the mixture was 390 cPs. After full-surface exposure with a commercially available Cyrel® printing plate exposure device, the gap filling material showed a hardness of 67 Shore A and a rebound resilience of 34.8%.
Mit dem so hergestellten Druckzylinder wurden Drucktests bei 100 und 200 m/min durchgeführt. Das Spaltfüllmaterial war stabil gegenüber den Druckfarben und zeigte eine gute Farbübertragung, die der der Druckform entsprach.Printing tests were carried out with the printing cylinder thus produced 100 and 200 m / min performed. The gap filling material was stable against the inks and showed a good Color transfer that corresponded to that of the printing form.
Wie in Beispiel 1 beschrieben wurde eine o.g. Druckplatte verarbeitet und der Spalt mit einem photopolymerisierbaren Gemisch aus 92.5 % polyethoxyliertes 4-Nonylphenolacrylat (4 Mol Ethylenoxid), 1.5 % Hexamethylenglykoldiacrylat, 5 % eines Polystyrol-Polybutadien-Polystyrol Blockcopolymeren (Mw 130 000) und 1.0 % Initiator verschlossen. Die Viskosität des Gemischs betrug 230 cPs. Nach der vollflächigen Belichtung mit einem handelsüblichen Cyrel® Druckplattenbelichtungsgerät zeigte das Spaltfüllmaterial eine Härte von 42 Shore A und eine Rückprallelastizität von 18.0 %. Es wurde kein brauchbarer Druckzylinder erhalten, da das Spaltfüllmaterial am Klebeband hängenblieb.As described in Example 1, an above-mentioned. printing plate processed and the gap with a photopolymerizable Mixture of 92.5% polyethoxylated 4-nonylphenol acrylate (4th Mol ethylene oxide), 1.5% hexamethylene glycol diacrylate, 5% one Polystyrene-polybutadiene-polystyrene block copolymers (Mw 130 000) and 1.0% initiator closed. The viscosity of the The mixture was 230 cPs. After full exposure with a commercially available Cyrel® printing plate exposure device the gap filling material showed a hardness of 42 Shore A and a rebound resilience of 18.0%. No usable impression cylinder was obtained because that Gap filling material stuck to the adhesive tape.
Wie in Beispiel 1 beschrieben wurde eine o.g. Druckplatte verarbeitet und der Spalt mit einem photopolymerisierbaren Gemisch aus 27 % Laurylacrylat, 15 % Hexamethylenglykoldiacrylat, 38 % Polybutadienmethacrylat (Mn 3000 - 4000), 19 % eines 1,4 Polybutadiens (Schmelztemperatur ca. - 50 °C) und 1.0 % Initiator verschlossen. Die Viskosität des Gemischs betrug 749 cPs. Nach der vollflächigen Belichtung mit einem handelsüblichen Cyrel® Druckplattenbelichtungsgerät zeigte das Spaltfüllmaterial eine Härte von 80 Shore A und eine Rückprallelastizität von 31 %. Es wurde kein brauchbarer Druckzylinder erhalten, da das photopolymerisierbare Spaltfüllmaterial inhomogen war und das belichtete Material zu hart war.As described in Example 1, an abovementioned printing plate was processed and the gap was coated with a photopolymerizable mixture of 27% lauryl acrylate, 15% hexamethylene glycol diacrylate, 38% polybutadiene methacrylate (M n 3000 - 4000), 19% of a 1.4 polybutadiene (melting temperature approx. - 50 ° C) and 1.0% initiator closed. The viscosity of the mixture was 749 cps. After full-surface exposure with a commercially available Cyrel® printing plate exposure device, the gap filling material showed a hardness of 80 Shore A and a rebound resilience of 31%. A usable impression cylinder was not obtained because the photopolymerizable gap filling material was inhomogeneous and the exposed material was too hard.
Claims (7)
- Process for covering edges and/or filling openings or gaps which are formed when photopolymerizable printing plates and photopolymer printing forms for flexographic printing are mounted on a printing cylinder, wherein the edge covering or gap filling material is applied and hardened by exposure to actinic radiation,
characterized in that,
a photopolymerizable mixture containing at least one photopolymerizable, ethylenically unsaturated, low molecular weight compound, at least one photopolymerizable, ethylenically unsaturated oligomeric compound, and at least one photoinitiator or a photoinitiator system is used as edge covering and/or gap filling material, wherein the weight ratio of the low molecular weight compound to the oligomeric compound is ≥ 2:1. - Process according to claim 1
characterized in that,
the weight ratio of the low molecular weight compound to the oligomeric compound is 2.5:1 to 4:1. - Process according to claim 1 to 2
characterized in that,
acrylates and/or methacrylates having a boiling point >100 °C and a molecular weight of 100 to 600 are used as low molecular weight compounds. - Process according to claim 1 to 3
characterized in that,
esters of acrylic and/or methacrylic acid with monovalent and/or polyvalent alcohols are used as low molecular weight compounds. - Process to claim 1 to 4
characterized in that,
acrylates and/or methacrylates having a boiling point >100 °C and a molecular weight of 1000 to 10000 are used as oligomeric compounds. - Process according to claim 1 to 5
characterized in that,
styrene/butadiene copolymers, (meth)acrylated polybutadienes and/or (meth)acrylate/butadiene copolymers are used as oligomeric compounds. - Process according to claim 1 to 6
characterized in that,
the photopolymerizable edge covering and gap filling material contains up to 10 % by weight of auxiliary materials.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19654103 | 1996-12-23 | ||
| DE19654103A DE19654103A1 (en) | 1996-12-23 | 1996-12-23 | Process for gluing edges of photopolymerizable printing plates or photopolymer printing plates for flexographic printing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0850781A1 EP0850781A1 (en) | 1998-07-01 |
| EP0850781B1 true EP0850781B1 (en) | 2001-10-10 |
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ID=7816073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97121811A Expired - Lifetime EP0850781B1 (en) | 1996-12-23 | 1997-12-11 | Process for adhering the edges of photopolymerizable printing plates or photopolymer printing forms for flexographic printing |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5998098A (en) |
| EP (1) | EP0850781B1 (en) |
| JP (1) | JP4230552B2 (en) |
| DE (2) | DE19654103A1 (en) |
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| US20040060647A1 (en) * | 2002-09-26 | 2004-04-01 | Burt Tabora | Method and apparatus for creating micro-cut plate break |
| EP1473595A1 (en) * | 2003-04-29 | 2004-11-03 | KRATON Polymers Research B.V. | Photopolymerizable compositions and flexographic printing plates derived therefrom |
| US8241818B2 (en) * | 2004-08-06 | 2012-08-14 | GM Global Technology Operations LLC | Diffusion media with hydrophobic and hydrophilic properties |
| CN108189535B (en) * | 2016-06-28 | 2019-07-12 | 佛山市顺德区美安达彩印包装有限公司 | A kind of cardboard Embosser |
| FR3099081B1 (en) * | 2019-07-26 | 2021-07-09 | Gergonne Sas | Method of maintaining the mounting adhesive on the cylinder or the plate holder sleeve of a flexographic printing machine |
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| DE3600774C1 (en) * | 1986-01-14 | 1987-05-07 | Du Pont Deutschland | Process for gluing photopolymerizable printing plates or printing forms for flexographic printing |
| DE3606155A1 (en) * | 1986-02-26 | 1987-08-27 | Basf Ag | PHOTOPOLYMERIZABLE MIXTURE, THIS CONTAINING LIGHT-SENSITIVE RECORDING ELEMENT, AND METHOD FOR PRODUCING A FLAT PRINT MOLD BY THIS LIGHT-SENSITIVE RECORDING ELEMENT |
| DE3630474A1 (en) * | 1986-09-06 | 1988-03-10 | Basf Ag | METHOD FOR PRODUCING RECORD LAYERS AND THE USE THEREOF FOR PRODUCING FLEXO PRINTING FORMS |
| DE3712070A1 (en) * | 1987-04-09 | 1988-10-20 | Basf Ag | METHOD FOR JOINING THE CUT EDGES OF PHOTOPOLYMERIZED FLEXO PRINTING FORMS |
| DE3736180A1 (en) * | 1987-10-26 | 1989-05-03 | Basf Ag | METHOD FOR CLOSING AND / OR SEALING OPENINGS, CAVES OR SPACES IN PRINTING PLATES APPLIED ON FORM CYLINDERS |
| DE3744243C2 (en) * | 1987-12-24 | 1995-12-07 | Du Pont Deutschland | Improved photopolymerizable recording materials |
| JP2786642B2 (en) * | 1988-11-16 | 1998-08-13 | 旭化成工業株式会社 | Plate joining method for photosensitive resin plate |
| DE3920093A1 (en) * | 1989-06-20 | 1991-01-03 | Basf Ag | METHOD FOR CLOSING AND / OR SEALING OPENINGS, CAVES OR SPACES IN PRINTING PLATES APPLIED ON FORM CYLINDERS |
| JP3798463B2 (en) * | 1996-04-04 | 2006-07-19 | 旭化成ケミカルズ株式会社 | Flexographic printing method |
-
1996
- 1996-12-23 DE DE19654103A patent/DE19654103A1/en not_active Withdrawn
-
1997
- 1997-12-01 US US08/982,104 patent/US5998098A/en not_active Expired - Fee Related
- 1997-12-11 EP EP97121811A patent/EP0850781B1/en not_active Expired - Lifetime
- 1997-12-11 DE DE59704862T patent/DE59704862D1/en not_active Expired - Lifetime
- 1997-12-24 JP JP35541697A patent/JP4230552B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP4230552B2 (en) | 2009-02-25 |
| DE59704862D1 (en) | 2001-11-15 |
| DE19654103A1 (en) | 1998-06-25 |
| US5998098A (en) | 1999-12-07 |
| JPH10204411A (en) | 1998-08-04 |
| EP0850781A1 (en) | 1998-07-01 |
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