EP1417099B1 - Method for producing a printing screen for serigraphy - Google Patents

Method for producing a printing screen for serigraphy Download PDF

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Publication number
EP1417099B1
EP1417099B1 EP02767282A EP02767282A EP1417099B1 EP 1417099 B1 EP1417099 B1 EP 1417099B1 EP 02767282 A EP02767282 A EP 02767282A EP 02767282 A EP02767282 A EP 02767282A EP 1417099 B1 EP1417099 B1 EP 1417099B1
Authority
EP
European Patent Office
Prior art keywords
coating
laser
printing
cross
linking
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
EP02767282A
Other languages
German (de)
French (fr)
Other versions
EP1417099A1 (en
Inventor
Werner Kunz
Karl Dennler
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.)
Sefar AG
Original Assignee
Sefar AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE10233767A external-priority patent/DE10233767A1/en
Application filed by Sefar AG filed Critical Sefar AG
Publication of EP1417099A1 publication Critical patent/EP1417099A1/en
Application granted granted Critical
Publication of EP1417099B1 publication Critical patent/EP1417099B1/en
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
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/14—Forme preparation for stencil-printing or silk-screen printing
    • B41C1/145—Forme preparation for stencil-printing or silk-screen printing by perforation using an energetic radiation beam, e.g. a laser
    • 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
    • B41N1/24—Stencils; Stencil materials; Carriers therefor

Definitions

  • the invention relates to a method for producing a screen printing stencil, in which a carrier surface is coated, according to the preamble of claim 1.
  • the invention covers a corresponding coating system.
  • US-A-3 696 742 describes a process for exclusively processing fabrics of metal wires coated with thermoplastic, uncrosslinked materials - such as polymethyl methacrylate (PMMA), polychlorotrifluoroethylene (PCTFE), polyoxymethylene (POM) - without laser light sensitive additives.
  • thermoplastic, uncrosslinked materials such as polymethyl methacrylate (PMMA), polychlorotrifluoroethylene (PCTFE), polyoxymethylene (POM) - without laser light sensitive additives.
  • metal powder is used to increase the thermal conductivity of the coating material.
  • EP 1 080 883 A2 describes a material which is used for the production of relief printing plates especially for flexographic printing. However, this material can be used in this modification - other modifications are not described - are not used for the production of stencil printing stencils, in particular with regard to the consistency and the concentration of the additives. When using laser-engravable stencils, other printing techniques must be used.
  • JP-A-7 104 462 discloses a UV-curable color filter system comprising a photosensitive emulsion of polyvinyl alcohol, carbon black, blue phthalocyanines, yellow disazo dye.
  • the stencil production corresponds to the principle known from the prior art.
  • the prior art also shows the processing of plastics with laser beams, which are mixed with special additives such as iron oxide or soot.
  • the inventor has set the goal to improve the production of printing stencils and the application of materials to a printing fabric by means of appropriate coating process and at the same time to make laser engravable.
  • For screen printing it is assumed that - since it is a through-printing process - the coating can or must be completely removed where the printed image is to be produced.
  • the tissue itself must not be destroyed.
  • a coating paste of laser-engravable material is applied in uncrosslinked state on a screen printing fabric and then subjected to a curing or crosslinking process, wherein the coating is processed or ablated on the print fabric by means of laser beams for imaging.
  • the application of the coating paste is indirect and can be done both before and after tensioning the screen printing fabric on the screen frame.
  • the coating paste of laser-engravable material is applied according to the invention to a dimensionally stable transfer film and transferred from the latter in the uncrosslinked state.
  • the crosslinking process can therefore also be carried out before and after the stretching of this fabric.
  • An ablation of the coating for imaging - as in the present invention - does not take place in the relevant state of the screen printing technology.
  • the coating method according to the invention is adapted to the requirements of screen printing and is divided into a primary and a secondary process.
  • the coating of the dimensionally stable transfer film mentioned first takes place by a suitable application method, for example by means of a roll or air doctor blade, anilox roll application or spray application.
  • the secondary process involves transferring the coating paste in the uncrosslinked state from the film to the screen printing fabric followed by a curing or crosslinking process.
  • the application of the coating paste on a stencil for screen printing has proven to be particularly favorable.
  • the coating of the fabric web should be performed over the entire surface or partially.
  • Full-area means in this case that the carrier material, regardless of the template image size, is completely coated, while in a partial coating, the coating surface is adapted to the later stencil or image size.
  • the coating on the screen printing frame is processed by means of laser beams in such a way that the material to be printed can be printed as before.
  • the filming, exposure and washout operations of the stencil are eliminated and replaced by laser engraving. Since a particularly smooth surface of the coating is required in screen printing, the coating process must be adapted or selected accordingly.
  • the coating systems are modified in a spreadable form by solvents or dispersants or by the laser-sensitive additives themselves, even in the appropriate concentration.
  • additives are preferably carbon black or iron oxides.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Printing Methods (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Non-Metallic Protective Coatings For Printed Circuits (AREA)

Abstract

The invention relates to a method for producing a screen printing stencil. According to the invention, a carrier surface is coated especially by means of a roller squeegee or an air squeegee, by screen roller application or by spray application, in such a way that a coating paste in an uncross-linked state consisting of a laser-engravable material is applied to a printing tissue, and is subjected to a hardening or cross-linking process, and the coating is then subsequently processed by means of laser radiation on the printing tissue. The coating paste consisting of a laser-engravable material is applied to a dimensionally stable transfer film, and is transferred from the transfer film to the printing tissue in the uncross-linked state. It has been proven advantageous to apply the coating paste to the printing tissue for the serigraphy, said printing tissue being stretched on a screen printing stencil, and to apply the coating over the entire surface or a part of the same.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen einer Siebdruckschablone, bei dem eine Trägerfläche beschichtet wird, nach dem Oberbegriff des Patentanspruches 1. Zudem erfasst die Erfindung ein dazu gehörendes Beschichtungssystem.The invention relates to a method for producing a screen printing stencil, in which a carrier surface is coated, according to the preamble of claim 1. In addition, the invention covers a corresponding coating system.

Im Siebdruck wird bei Herstellung von Druckschablonen bisher wie folgt vorgegangen:

  • Spannen eines Gewebes auf einen Rahmen;
  • Beschichten des Gewebes mit einer photosensitiven Emulsion;
  • Belichten und Härten der Emulsionsschicht;
  • Auswaschen bzw. Entfernen der nicht belichteten Flächen.
In screen printing, the following procedure has been used in the production of printing stencils:
  • Tensioning a fabric onto a frame;
  • Coating the fabric with a photosensitive emulsion;
  • Exposing and curing the emulsion layer;
  • Wash out or remove unexposed areas.

Anschließend kann gedruckt werden.You can then print.

US-A-3 696 742 beschreibt ein Verfahren zum ausschließlichen Bearbeiten von Geweben aus Metalldrähten, die mit thermoplastischen, unvernetzten Materialien -- wie Polymethylmethacrylat (PMMA), Polychlortrifluorethylen (PCTFE), Polyoxymethylen (POM) -- ohne laserlichtsensitive Additive beschichtet sind.US-A-3 696 742 describes a process for exclusively processing fabrics of metal wires coated with thermoplastic, uncrosslinked materials - such as polymethyl methacrylate (PMMA), polychlorotrifluoroethylene (PCTFE), polyoxymethylene (POM) - without laser light sensitive additives.

Nach EP 0 291 137 A1 wird Metallpulver zur Erhöhung der Wärmeleitfähigkeit des Beschichtungsmaterials eingesetzt.According to EP 0 291 137 A1, metal powder is used to increase the thermal conductivity of the coating material.

In der EP 1 080 883 A2 wird ein Material beschrieben, das zum Herstellen von Reliefdruckplatten speziell für den Flexodruck, verwendet wird. Dieses Material kann jedoch in dieser Modifikation -- andere Modifikationen werden nicht beschrieben -- für die Herstellung von Druckschablonen im Siebdruckbereich nicht verwendet werden, dies insbesondere bezüglich der Konsistenz und der Konzentration der Additive. Beim Einsatz von lasergravierbaren Schablonen muss auf andere Druckverfahren ausgewichen werden.EP 1 080 883 A2 describes a material which is used for the production of relief printing plates especially for flexographic printing. However, this material can be used in this modification - other modifications are not described - are not used for the production of stencil printing stencils, in particular with regard to the consistency and the concentration of the additives. When using laser-engravable stencils, other printing techniques must be used.

Aus US-A-5 443 677 ist eine Anlage zum Belichten von Rotationsschablonen bekannt mit einem Verfahren, bei dem Beschichtungsmaterial mittels Laserstrahl vernetzt bzw. polymerisiert wird. Hierbei wird lediglich die Filmherstellung eingespart.From US-A-5 443 677 a system for exposing rotary stencils is known with a method in which coating material is cross-linked or polymerized by means of laser beam. Here only the film production is saved.

Schließlich lässt JP-A-7 104 462 ein UV-vernetzbares System für Farbfilter mit einer fotosensitiven Emulsion aus Polyvinylalkohol, Russ, blauen Phthalocyaninen, gelbem Disazofarbstoff erkennen. Die Schablonenherstellung entspricht hierbei dem aus dem Stande der Technik bekannten Prinzip.Finally, JP-A-7 104 462 discloses a UV-curable color filter system comprising a photosensitive emulsion of polyvinyl alcohol, carbon black, blue phthalocyanines, yellow disazo dye. The stencil production corresponds to the principle known from the prior art.

Dem Stande der Technik ist auch das Bearbeiten von Kunststoffen mit Laserstrahlen zu entnehmen, die mit speziellen Additiven wie Eisenoxid oder Russ versetzt sind.The prior art also shows the processing of plastics with laser beams, which are mixed with special additives such as iron oxide or soot.

In Kenntnis dieser Gegebenheiten hat sich der Erfinder das Ziel gesetzt, das Herstellen von Druckschablonen und das Auftragen von Werkstoffen auf ein Druckgewebe mittels entsprechendem Beschichtungsverfahren zu verbessern und gleichzeitig lasergravierbar zu gestalten. Für den Siebdruck wird vorausgesetzt, dass -- da es sich um ein Durchdruckverfahren handelt -- die Beschichtung dort, wo das Druckbild entstehen soll, vollständig abgetragen werden kann bzw. muss. Andererseits darf das Gewebe selbst nicht zerstört werden.In view of these circumstances, the inventor has set the goal to improve the production of printing stencils and the application of materials to a printing fabric by means of appropriate coating process and at the same time to make laser engravable. For screen printing, it is assumed that - since it is a through-printing process - the coating can or must be completely removed where the printed image is to be produced. On the other hand, the tissue itself must not be destroyed.

Zur Lösung dieser Aufgabe führt die Lehre des unabhängigen Anspruches; die Unteransprüche geben günstige Weiterbildungen an.To achieve this object, the teaching of the independent claim; the dependent claims indicate favorable developments.

Erfindungsgemäß wird auf ein Siebdruckgewebe eine Beschichtungspaste aus lasergravierbarem Werkstoff in unvernetztem Zustand aufgebracht sowie anschließend einem Aushärtungs- bzw. Vernetzungsprozess unterzogen, wobei die Beschichtung auf dem Druckgewebe mittels Laserstrahlen zur Bildgebung bearbeitet bzw. ablatiert wird. Das Auftragen der Beschichtungspaste ist indirekt und kann sowohl vor als auch nach dem Spannen des Siebdruckgewebes auf den Siebdruckrahmen erfolgen. So wird beim indirekten Auftragsverfahren die Beschichtungspaste aus lasergravierbarem Werkstoff erfindungsgemäß auf eine dimensionsstabile Transferfolie aufgetragen sowie von letzterer in unvernetztem Zustand übertragen. Der Vernetzungsprozess kann demzufolge ebenfalls vor und nach dem Spannen dieses Gewebes durchgeführt werden. Ein Abtragen der Beschichtung für die Bildgebung - wie bei vorliegender Erfindung - findet beim relevanten Stand der Siebdrucktechnik nicht statt.According to the invention, a coating paste of laser-engravable material is applied in uncrosslinked state on a screen printing fabric and then subjected to a curing or crosslinking process, wherein the coating is processed or ablated on the print fabric by means of laser beams for imaging. The application of the coating paste is indirect and can be done both before and after tensioning the screen printing fabric on the screen frame. Thus, in the case of the indirect application method, the coating paste of laser-engravable material is applied according to the invention to a dimensionally stable transfer film and transferred from the latter in the uncrosslinked state. The crosslinking process can therefore also be carried out before and after the stretching of this fabric. An ablation of the coating for imaging - as in the present invention - does not take place in the relevant state of the screen printing technology.

Das erfindungsgemäße Beschichtungsverfahren ist den Anforderungen des Siebdrucks angepasst und wird aufgeteilt in einen primären und einen sekundären Prozess.The coating method according to the invention is adapted to the requirements of screen printing and is divided into a primary and a secondary process.

Beim primären Prozess erfolgt zuerst das Beschichten der erwähnten dimensionsstabilen Transferfolie durch ein geeignetes Auftragsverfahren, etwa mittels Walzen- oder Luftrakels, Rasterwalzenauftrag oder Sprühauftrag. Der sekundäre Prozess umfasst das Übertragen der Beschichtungspaste im unvernetzten Zustand von der Folie auf das Siebdruckgewebe mit anschließendem Aushärtungs- bzw. Vernetzungsprozess.In the primary process, the coating of the dimensionally stable transfer film mentioned first takes place by a suitable application method, for example by means of a roll or air doctor blade, anilox roll application or spray application. The secondary process involves transferring the coating paste in the uncrosslinked state from the film to the screen printing fabric followed by a curing or crosslinking process.

Dazu hat sich das Auftragen der Beschichtungspaste auf eine Druckschablone für den Siebdruck als besonders günstig erwiesen.For this purpose, the application of the coating paste on a stencil for screen printing has proven to be particularly favorable.

Nach weiteren Merkmalen der Erfindung soll das Beschichten der Gewebebahn vollflächig oder partiell durchgeführt werden. Vollflächig bedeutet hierbei, dass das Trägermaterial unabhängig von der Schablonen-Bildgröße, vollständig beschichtet wird, während bei einer partiellen Beschichtung die Beschichtungsfläche an die spätere Schablonen- oder Bildgröße angepasst ist.According to further features of the invention, the coating of the fabric web should be performed over the entire surface or partially. Full-area means in this case that the carrier material, regardless of the template image size, is completely coated, while in a partial coating, the coating surface is adapted to the later stencil or image size.

Zum Herstellen einer siebdruckfähigen Schablone wird die Beschichtung auf dem Siebdruckrahmen mittels Laserstrahlen derart bearbeitet, dass das zu bedruckende Material wie bisher bedruckt zu werden vermag.To produce a stencil which can be screen printed, the coating on the screen printing frame is processed by means of laser beams in such a way that the material to be printed can be printed as before.

Mit der vorliegenden Erfindung fallen die Arbeitsgänge der Filmherstellung, des Belichtens und des Auswaschens der Schablone weg und werden durch das Lasergravieren ersetzt. Da beim Siebdruck eine besonders glatte Oberfläche der Beschichtung verlangt wird, muss das Beschichtungsverfahren entsprechend angepasst bzw. gewählt werden.With the present invention, the filming, exposure and washout operations of the stencil are eliminated and replaced by laser engraving. Since a particularly smooth surface of the coating is required in screen printing, the coating process must be adapted or selected accordingly.

Entsprechend der Lehre nach der oben erwähnten EP 1 080 883 A2 sind verschiedene Materialzusammensetzungen möglich. Darüber hinausgehend sind erfindungsgemäß die Beschichtungssysteme durch Lösungs- oder Dispergiermittel oder durch die lasersensitiven Additive selbst in entsprechender Konzentration streichfähig modifiziert.According to the teachings of the above-mentioned EP 1 080 883 A2 various compositions of materials are possible. In addition, according to the invention, the coating systems are modified in a spreadable form by solvents or dispersants or by the laser-sensitive additives themselves, even in the appropriate concentration.

Die Beschichtungssysteme können sich im Rahmen der Erfindung wie folgt zusammensetzen:

  • Wärmevernetzende Ein- oder Zweikomponentensysteme:
    • Basispolymere wie Polyurethan (PUR)/Isocyanat oder Silikon-Kautschuk;
    • Laserlicht absorbierende Additive;
    • Lösungs- bzw. Dispergiermittel.
  • Kaltvernetzende Ein- oder Zweikomponentensysteme, jeweils mit:
    • Basispolymere wie Silikon-Kautschuk;
    • Laserlicht absorbierende Additive;
    • Lösungs- bzw. Dispergiermittel.
  • UV-vernetzende Systeme:
    • Fotosensitive Emulsion auf Basis von Polyvinylalkohol (PVAL);
    • Laserlicht absorbierende Additive;
    • Lösungs- bzw. Dispergiermittel.
The coating systems may be composed within the scope of the invention as follows:
  • Heat-curing one- or two-component systems:
    • Base polymers such as polyurethane (PUR) / isocyanate or silicone rubber;
    • Laser light absorbing additives;
    • Solvent or dispersant.
  • Cold-curing one- or two-component systems, each with:
    • Base polymers such as silicone rubber;
    • Laser light absorbing additives;
    • Solvent or dispersant.
  • UV-curing systems:
    • Photosensitive emulsion based on polyvinyl alcohol (PVAL);
    • Laser light absorbing additives;
    • Solvent or dispersant.

Im übrigen sind jene Additive bevorzugt Russ oder Eisenoxide.Otherwise, those additives are preferably carbon black or iron oxides.

Dank der erfindungsgemäßen Lehre wird die vom Erfinder gesehene Aufgabe in bestechender Weise gelöst.Thanks to the teaching of the invention, the object seen by the inventor is achieved in an impressive manner.

Claims (11)

  1. Method for manufacturing a screen for silk-screen printing, in which a coating paste is applied to a printing fabric and then subjected to a hardening or cross-linking process, the coating on the printing fabric subsequently being treated with laser beams,
    characterised in that
    the coating paste is made of laser-engravable material and applied to a dimensionally stable transfer film and transferred in the uncross-linked state from the transfer film to the printing fabric and laser-engraved on the latter with laser beams.
  2. Method according to claim 1, characterised in that the coating paste is applied to the printing fabric for silk-screen printing after stretching over a silk-screen printing frame.
  3. Method according to claim 1 or 2, characterised in that coating is carried out over the whole surface.
  4. Method according to claim 1 or 2, characterised in that coating is carried out partially.
  5. Method according to one or more of the preceding patent claims, characterised by the use of a coating system comprising heat-cross-linking two-component systems:
    (a) base polymers such as polyurethane (PUR)/ isocyanate or silicone rubber;
    (b) laser light-absorbing additives;
    (c) solvents or dispersants.
  6. Method according to one or more of claims 1 to 4, characterised by the use of a coating system comprising cold-cross-linking two-component systems:
    (a) base polymers such as silicone rubber;
    (b) laser light-absorbing additives;
    (c) solvents or dispersants.
  7. Method according to one or more of claims 1 to 4, characterised by the use of a coating system comprising cold-cross-linking single-component systems:
    (a) base polymers such as silicone rubber;
    (b) laser light-absorbing additives;
    (c) solvents or dispersants.
  8. Method according to one or more of claims 1 to 4, characterised by the use of a coating system comprising heat-cross-linking single-component systems:
    (a) base polymers such as polyurethane (PUR);
    (b) laser light-absorbing additives;
    (c) solvents or dispersants.
  9. Method according to one or more of claims 1 to 4, characterised by the use of a coating system comprising UV-cross-linking systems:
    (a) photosensitive emulsions on the basis of polyvinyl alcohol (PVAL);
    (b) laser light-absorbing additives;
    (c) solvents or dispersants.
  10. Method according to one or more of claims 5 to 9, characterised in that the additives are carbon black or iron oxides.
  11. Method according to one or more of claims 5 to 9, characterised in that the additives belong to the group of benzophenones.
EP02767282A 2001-08-14 2002-07-31 Method for producing a printing screen for serigraphy Expired - Lifetime EP1417099B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10138816 2001-08-14
DE10138816 2001-08-14
DE10233767A DE10233767A1 (en) 2001-08-14 2002-07-25 Process for producing a stencil for screen printing and coating system
DE10233767 2002-07-25
PCT/EP2002/008513 WO2003016055A1 (en) 2001-08-14 2002-07-31 Method for producing a printing screen for serigraphy and associated coating system

Publications (2)

Publication Number Publication Date
EP1417099A1 EP1417099A1 (en) 2004-05-12
EP1417099B1 true EP1417099B1 (en) 2006-11-15

Family

ID=26009898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02767282A Expired - Lifetime EP1417099B1 (en) 2001-08-14 2002-07-31 Method for producing a printing screen for serigraphy

Country Status (7)

Country Link
EP (1) EP1417099B1 (en)
AT (1) ATE345214T1 (en)
DE (1) DE50208721D1 (en)
DK (1) DK1417099T3 (en)
ES (1) ES2276956T3 (en)
HK (1) HK1067591A1 (en)
WO (1) WO2003016055A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696742A (en) * 1969-10-06 1972-10-10 Monsanto Res Corp Method of making a stencil for screen-printing using a laser beam
NL8701176A (en) * 1987-05-15 1988-12-01 Stork Screens Bv PATTERN COATING FOR A METAL SILK PRINT TEMPLATE; SCREEN-PRINTING TEMPLATE PROVIDED WITH A PATTERNING COATING AND METHOD FOR APPLYING A PATTERNING PATTERN TO A COATING COATING ON A METAL SCREEN-PRINTING TEMPLATE.
EP0658812B1 (en) * 1992-10-21 2000-05-24 Schablonentechnik Kufstein Aktiengesellschaft Rotating exposure apparatus for the preparation of a cylindrical printing screen
DE19942216C2 (en) 1999-09-03 2003-04-24 Basf Drucksysteme Gmbh Silicone rubber and iron-containing, inorganic solids and / or soot-containing recording material for the production of relief printing plates by means of laser engraving, process for the production of relief printing plates and the relief printing plate produced therewith

Also Published As

Publication number Publication date
WO2003016055A1 (en) 2003-02-27
ES2276956T3 (en) 2007-07-01
EP1417099A1 (en) 2004-05-12
HK1067591A1 (en) 2005-04-15
ATE345214T1 (en) 2006-12-15
DK1417099T3 (en) 2007-03-19
DE50208721D1 (en) 2006-12-28

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