EP1390202B1 - Procede de production d'une plaque d'impression pouvant etre directement gravee au laser, et plaque d'impression produite selon ledit procede - Google Patents

Procede de production d'une plaque d'impression pouvant etre directement gravee au laser, et plaque d'impression produite selon ledit procede Download PDF

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Publication number
EP1390202B1
EP1390202B1 EP02730270A EP02730270A EP1390202B1 EP 1390202 B1 EP1390202 B1 EP 1390202B1 EP 02730270 A EP02730270 A EP 02730270A EP 02730270 A EP02730270 A EP 02730270A EP 1390202 B1 EP1390202 B1 EP 1390202B1
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EP
European Patent Office
Prior art keywords
elastomer layer
printing plate
plate
printing
film
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
Application number
EP02730270A
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German (de)
English (en)
Other versions
EP1390202A1 (fr
Inventor
Heinz Lorig
Stephan Lorig
Klaus Langerbeins
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.)
Sonderhoff Chemicals GmbH
Polywest Kunststofftechnik Saueressig und Partner GmbH and Co KG
Original Assignee
Sonderhoff Chemicals GmbH
Polywest Kunststofftechnik Saueressig und Partner GmbH and Co KG
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Filing date
Publication date
Application filed by Sonderhoff Chemicals GmbH, Polywest Kunststofftechnik Saueressig und Partner GmbH and Co KG filed Critical Sonderhoff Chemicals GmbH
Publication of EP1390202A1 publication Critical patent/EP1390202A1/fr
Application granted granted Critical
Publication of EP1390202B1 publication Critical patent/EP1390202B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41N1/04—Printing plates or foils; Materials therefor metallic
    • B41N1/06—Printing plates or foils; Materials therefor metallic for relief printing or intaglio printing

Definitions

  • the invention relates to a method for producing a directly laser-engravable printing plate, in particular for flexographic printing.
  • the invention is further directed to a directly laser-engravable printing plate, in particular for flexographic printing, which has a lower support film or plate and an elastomer layer of silicone polymer, silicone fluoropolymer or silicone rubber applied thereto.
  • flexographic printing plate-shaped printing plates are used in addition to continuous printing plates, which may be, for example, rubber tables or photopolymer printing plates, which are often prepared for high-quality flexographic printing with the "Computer to Plate” method for printing.
  • continuous printing plates which may be, for example, rubber tables or photopolymer printing plates, which are often prepared for high-quality flexographic printing with the "Computer to Plate” method for printing.
  • plate printing plates these are mounted on printing plates or cylinders on which they are either glued or held magnetically by means of adhesive tapes or films - so-called “tapes" - when the inserted film or sheet of ferromagnetic material, such as e.g. Tinplate exists and magnetic cylinders or sleeves are used on which the tinplate sheet tightly applies.
  • vacuum cylinders to hold the pressure plate by means of negative pressure to this.
  • the known photopolymeric plates which are made of liquid photopolymers, have the disadvantage that their surface only after the plate exposure receives its final hardness required for printing and the surface quality can thus vary before the exposure. As a result, irregularities in the plate surface often reduce the print quality. A mechanical post-processing of the photopolymer plates to smooth their surface after exposure is not possible, as this would be the high-pressure parts, the plate would be damaged again.
  • a method for producing a seamless printing plate in which the elastomer layer is formed by a cold-curing silicone polymer or silicone fluoropolymer, which is applied to the cylindrical outer surface of a carrier by Rotationsg tell compiler and directly after curing in a particularly advantageous manner can be engraved with a working laser.
  • the elastomer layer consists of a thermosetting one-component or two-component silicone polymer is known from DE 197 56 327.
  • a plate printing forme is known, for their production, first a layer of a curable elastomer is applied to a carrier with a cylindrical surface by Rotationsg tell compiler as in the two aforementioned publications, then hardens the elastomer layer and the resulting The printing block blank is then ground and then separated along a section line running essentially parallel to the axial direction of the carrier, whereupon the printing plate produced in this way can be removed from the lateral surface of the carrier.
  • printing plates of the highest quality can be produced, which can be engraved directly after their completion with a working laser and meet the highest quality requirements for printing accuracy.
  • DE 199 42 216 discloses a method for producing a laser-engravable printing plate.
  • an elastomeric layer of silicone polymers is applied to a flat support film.
  • the elastomer layer is aftertreated to form a flat surface, wherein a cover sheet is applied to the elastomer layer as a protection against mechanical damage before the aftertreatment.
  • DE 199 42 216 proposes the use of an additional, thin upper layer.
  • the application of the additional top layer represents an additional process step.
  • the object of the invention is to provide a method for producing a directly laser-engravable printing plate, in which the ink absorption is improved in subsequent printing in a simple manner.
  • an elastomer layer of silicone polymer, silicone fluoropolymer or silicone rubber is applied to a first approximately horizontally oriented lower support sheet or plate and then post-treated to form a flat surface.
  • the aftertreatment takes place in a particularly advantageous manner at least partially with a Kalibriereinrich-device with a calender nip through which the printing plate is transported in the not yet cured state of its elastomer layer.
  • the production of the directly laser-engravable printing plate does not take place on a cylindrical outer surface, but the silicone polymer, silicone fluoropolymer or silicone rubber used to form an elastomer layer is applied to the flat support foil or plate.
  • the job can be done in strips, which are applied transversely to the longitudinal direction of the support film from a gun, which moves relative to the support film from one to the other longitudinal edge and back.
  • the elastomer layer is provided with a covering film on its surface before it is hardened.
  • the cover sheet effectively prevents the elastomeric material used from adhering to the calendering roll or to a calendering squeegee instead of which it is used, which otherwise can lead to errors in the production of the printing plate.
  • the covering film has a roughened and / or profiled surface on its underside facing the elastomer layer, which then presses into the still soft elastomer layer and forms a correspondingly roughened and / or profiled surface after the covering film has been removed from the then exposed printing side of the elastomer layer , as desired or required for ink absorption during later printing.
  • the particularly advantageous after-treatment step in a calibration device with calender gap ensures that the not yet cured elastomer layer is deformed or rolled in a particularly simple and fast manner over the entire width of the printing plate to the desired thickness of the printing plate.
  • the calibration device expediently consists essentially of a lower, exactly flat pressure strip and a parallel arranged above this, also highly accurate calender roll, which is very precisely adjustable in their distance from the pressure strip.
  • the thickness of the printing plates according to the invention can be set by calendering the not yet cured elastomer layer with very high accuracy to the desired level, the achievable accuracy depends only on the precision, are made with the calender roll and pressure strip and with the let the two main components of the calibration set in their distance from each other.
  • the cover film is expediently applied to the elastomer layer before the calendering process and can be removed again after the elastomer layer has hardened.
  • the elastomer layer can be ground after its hardening on the surface or subjected to high-speed milling, if extremely high demands are placed on the surface finish. In this case, the grinding or milling can always be done immediately after the application of the elastomer on the support sheet or plate and its curing.
  • the support film or plate may be provided on its upper side facing the elastomer layer with a lamination of a compressible intermediate layer.
  • a compressible intermediate layer it is possible, in particular for printing plates which are to be used for the direct printing of corrugated cardboard and other materials having an irregular surface, to set the desired compressibility of the entire printing plate at a predetermined printing height during printing.
  • the elastomer layer can be arranged directly on the lamination, ie without first on this an intermediate layer of a film or the like, to arrange, whereby the compressibility of the laminated on the support film interlayer is completely available during later printing , so is not lowered by an approximately interposed foil.
  • the compressible intermediate layer is able to reliably compensate even inaccuracies in the surface of the elastomer layer, which are in the 1/10 mm range, since their compressibility is not reduced by an additional intermediate layer of a film.
  • the cover film used to cover the elastomer layer which has been removed from the elastomer layer after it has hardened, subsequently as a support film for a subsequently produced printing plate.
  • the cover film is pretreated prior to its use as a carrier film with a primer (solvent).
  • the invention provides a directly laser-engravable printing plate, in particular for flexographic printing with a lower support film or plate and an elastomer layer of silicone polymer, silicone fluoropolymer or silicone rubber applied thereto, wherein the elastomer layer is processed by means of a calendering gap calibrating device, through which the printing plate before Hardening of the elastomer layer is transported.
  • the support film or plate may preferably be provided on its upper side facing the elastomer layer with a lamination of a compressible intermediate layer on which the elastomer layer is arranged directly.
  • the apparatus 10 shown schematically in FIG. 1 serves to produce a directly laser-engravable printing plate 11, which consists essentially of a lower support film 12 and an elastomer layer 13 arranged thereon of a silicone polymer, silicone fluoropolymer or silicone rubber.
  • the materials forming the elastomer layer may preferably be those known from the earlier patent DE 196 25 749 C2 or DE 197 56 327 A1.
  • the support film 12 is provided at its upper side 14 with a lamination 15 made of an elastic foam material on which the elastomer layer 13 directly, i. is arranged without interposition of a film or other intermediate layer.
  • the elastomer layer 13 has a greater thickness and is applied directly to the primer-pretreated upper side 14 of the carrier film 12.
  • the production of the printing plate according to the invention is carried out continuously in the plane.
  • the carrier film 12 is first unwound from a supply roll 16 and placed horizontally on a first conveyor belt 17.
  • a extending over the width of the support film and the conveyor belt guide roller 18 ensures that the support film comes to rest wrinkle-free on the conveyor belt 17.
  • the elastomer layer 13 forming silicone polymer, silicone fluoropolymer or the silicone rubber is then applied directly to the lamination of the support sheet 12 with the aid of a mixing and dosing head 19, which is operated here with little excess material and the elastomer layer 13 has a slightly uneven surface 20 immediately after its application.
  • the not yet cured elastomer layer is covered during further transport of the printing plate blank thus produced by the conveyor belt 17 with a cover 21, which has a roughened surface on its underside 22. This consisting of lower support film 12, lamination 15, elastomer layer 13 and top cover 21, sandwich-like structure then runs from the first
  • the calender roll can be adjusted with high precision by means of a setting device 28 shown greatly simplified, so that the thickness of the calender gap can be adjusted with an accuracy of up to 1/100 mm over the entire width of the support film.
  • the calibrated as described above pressure plate passes from the calendering gap 23 on a second conveyor belt 29, on which the elastomeric layer hardens, which depending on the type of elastomer material used by complementary devices, such as radiant heaters or the like. can be favored, which are not shown in Fig. 1, however.
  • the cover film 21 is pulled off from the top of the elastomer layer 13 and wound on a roll 30.
  • the roughened underside 22 of the cover leaves in the cured elastomer layer a corresponding structure that holds the ink during the later printing with the printing plate particularly well and a clean Transmission of the printed image on the surface to be printed ensures.
  • the wound onto the roll cover 30 can either be used again to cover the not yet cured elastomer layer before passing the pressure plate by the calibration or serve as a support film 12, to which they are first pretreated at their top with a suitable primer and then optionally with the Lamination 15 is provided before it is wound up on a carrier supply roll.
  • the elastomer layer 13 is applied directly to the support sheet, i. a soft elastic lamination on der.Tragfolie is not provided in this embodiment. 4, after its passage through the calibrating device according to FIG. 1 and curing of the elastomer layer and removal of the covering film, the surface is reground, thus achieving a highly accurate surface with a thickness deviation in the 1/100 mm range.
  • the pressure plate is machined on its surface by means of a high-speed grinding wheel 31, which can achieve the desired accuracy in only a single pass at a correspondingly low material removal.

Landscapes

  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Plates And Materials Therefor (AREA)

Claims (9)

  1. Procédé de production d'une plaque d'impression (11) pouvant être directement gravée par laser en particulier pour la flexographie, dans lequel on rapporte sur au moins une pellicule ou plaque (12) de support s'étendant de façon sensiblement horizontale, une couche d'élastomère (13) en polymère silicone, polymère silicone fluoré, ou caoutchouc silicone que l'on retraite ensuite pour obtenir une surface plane, caractérisé en ce que la couche d'élastomère (13), avant son durcissement, est pourvue sur sa surface supérieure (20) d'une pellicule de couverture (21) présentant sur son côté inférieur (22) adjacent à la couche d'élastomère (13) une surface rugueuse et/ou profilée.
  2. Procédé selon la revendication 1, caractérisé en ce que le retraitement est réalisé au moins avec un dispositif de calibrage (24) ayant une fente de calandrage (23) à travers laquelle est transportée la plaque d'impression (11) avec sa couche d'élastomère (13) non encore durcie.
  3. Procédé selon la revendication 2, caractérisé en ce que la pellicule de couverture (21) est appliquée sur la couche d'élastomère (13) avant le processus de calandrage et est retirée de nouveau de cette couche d'élastomère (13) après durcissement de celle-ci.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la couche d'élastomère (13) est polie, après son durcissement et retrait de la pellicule de couverture (21).
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la pellicule ou plaque (12) de support est pourvue sur son côté supérieur (14) adjacent à la couche d'élastomère (13) d'un contrecouchage (15) en une couche intermédiaire compressible.
  6. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la pellicule de couverture (21) est utilisée, après son retrait de la couche d'élastomère (13) durcie, en tant que pellicule de support (12) pour une plaque d'impression (11) produite ensuite.
  7. Procédé selon la revendication 6, caractérisé en ce que la pellicule de couverture (21) est prétraitée avec un primaire avant son utilisation en tant que pellicule de support (12).
  8. Plaque d'impression (11) pouvant être gravée directement par laser en particulier pour flexographie, comportant une pellicule ou plaque de support (12) sur laquelle est rapportée une couche d'élastomère (13) en polymère de silicone, en polymère de silicone fluoré ou en caoutchouc silicone, pouvant être obtenue selon un procédé dans lequel la couche d'élastomère (13) est retraitée au moyen d'un dispositif de calandrage (24) ayant une fente de calandrage (23) à travers laquelle est transportée la plaque d'impression (11) avant le durcissement de la couche d'élastomère (13), caractérisée en ce que, la couche d'élastomère (13), avant son durcissement est pourvue sur sa surface supérieure (20) d'une pellicule de couverture (21) présentant sur son côté inférieur (22) adjacent à la couche d'élastomère (13) une surface rugueuse et/ou profilée.
  9. Plaque d'impression selon la revendication 8, caractérisée en ce que la pellicule (12) ou plaque de support présente sur son côté supérieur (14) adjacent à la couche d'élastomère (13) un contrecouchage (15) en une couche intermédiaire compressible sur lequel la couche d'élastomère (13) est directement appliquée.
EP02730270A 2001-05-28 2002-05-22 Procede de production d'une plaque d'impression pouvant etre directement gravee au laser, et plaque d'impression produite selon ledit procede Expired - Lifetime EP1390202B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10126067A DE10126067A1 (de) 2001-05-28 2001-05-28 Verfahren zum Herstellen einer direkt lasergravierbaren Druckplatte sowie nach dem Verfahren hergestellte Druckplatte
DE10126067 2001-05-28
PCT/EP2002/005611 WO2002096648A1 (fr) 2001-05-28 2002-05-22 Procede de production d'une plaque d'impression pouvant etre directement gravee au laser, et plaque d'impression produite selon ledit procede

Publications (2)

Publication Number Publication Date
EP1390202A1 EP1390202A1 (fr) 2004-02-25
EP1390202B1 true EP1390202B1 (fr) 2006-04-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02730270A Expired - Lifetime EP1390202B1 (fr) 2001-05-28 2002-05-22 Procede de production d'une plaque d'impression pouvant etre directement gravee au laser, et plaque d'impression produite selon ledit procede

Country Status (4)

Country Link
EP (1) EP1390202B1 (fr)
AT (1) ATE322381T1 (fr)
DE (2) DE10126067A1 (fr)
WO (1) WO2002096648A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1762397A1 (fr) * 2005-09-12 2007-03-14 Folex Coating GmbH Forme d'impression compressible multicouche
DE102009003817A1 (de) 2009-04-23 2010-10-28 Contitech Elastomer-Beschichtungen Gmbh Mehrschichtiges Flächengebilde in Form eines Drucktuches oder einer Druckplatte für den Flexo-und Hochdruck mit einer Lasergravur

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3833650A1 (de) * 1988-10-04 1990-04-05 Basf Ag Kontinuierliches verfahren zur herstellung eines lichtempfindlichen aufzeichnungselements
US5804353A (en) * 1992-05-11 1998-09-08 E. I. Dupont De Nemours And Company Lasers engravable multilayer flexographic printing element
DE19625749C2 (de) 1996-06-27 1998-12-17 Polywest Kunststofftechnik Verfahren zur Herstellung einer nahtlosen Druckform für den rotativen Hochdruck
DE19942216C2 (de) * 1999-09-03 2003-04-24 Basf Drucksysteme Gmbh Siliconkautschuk und eisenhaltige, anorganische Feststoffe und/oder Ruß enthaltendes Aufzeichnungsmaterial zur Herstellung von Reliefdruckplatten mittels Lasergravur, Verfahren zur Herstellung von Reliefdruckplatten sowie damit hergestellte Reliefdruckplatte
DE10023560A1 (de) 2000-05-15 2002-01-03 Polywest Kunststofftechnik Verfahren zum Herstellen einer Druckplatte insbesondere für den Hochdruck sowie Druckplatte für den Hochdruck

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Publication number Publication date
DE50206313D1 (de) 2006-05-18
ATE322381T1 (de) 2006-04-15
EP1390202A1 (fr) 2004-02-25
WO2002096648A1 (fr) 2002-12-05
DE10126067A1 (de) 2002-12-05

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