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EP0468184B1 - Method for manufacturing a plane and in particular a large surfaced support for printing - Google Patents

Method for manufacturing a plane and in particular a large surfaced support for printing Download PDF

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Publication number
EP0468184B1
EP0468184B1 EP91109644A EP91109644A EP0468184B1 EP 0468184 B1 EP0468184 B1 EP 0468184B1 EP 91109644 A EP91109644 A EP 91109644A EP 91109644 A EP91109644 A EP 91109644A EP 0468184 B1 EP0468184 B1 EP 0468184B1
Authority
EP
European Patent Office
Prior art keywords
synthetic resin
layer
printing
resin pouring
pouring material
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
EP91109644A
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German (de)
French (fr)
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EP0468184A1 (en
Inventor
Rudolf Fleischle
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Individual
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Individual
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Publication date
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Publication of EP0468184A1 publication Critical patent/EP0468184A1/en
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Publication of EP0468184B1 publication Critical patent/EP0468184B1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F15/00Screen printers
    • B41F15/14Details
    • B41F15/16Printing tables
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41NPRINTING 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
    • B41N6/00Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/26Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/269Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension including synthetic resin or polymer layer or component
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31511Of epoxy ether

Definitions

  • the invention relates to a method for producing a flat and large-area printing support surface for screen printing tables or the like.
  • a fixed printing table is provided for the support of the material to be printed, for example fabric, glass, enamel signs or the like.
  • This printing table has a print surface on the top, which must be flat to ensure high-quality screen printing.
  • this printing plate of the printing table consists, for example, of metal, for example of anodized aluminum.
  • the pressure plate is designed as a vacuum pressure plate which contains a multiplicity of holes, in which case the pressure plate also consists, for example, of metal, in particular anodized aluminum.
  • Such printing plates are heavy, expensive, and sensitive to their flat surface, especially in large-format machines.
  • Printing support plates are also known which have a thin Formica layer glued on to their top side. This is sensitive, hard and brittle, so that this layer is very easily damaged. Repairs to this layer are not possible because the Formica layer would first have to be removed from the carrier plate in a very time-consuming and expensive process, the rest of the Formica areas breaking easily and being difficult to remove. In such cases, a new platen must be provided, which is time-consuming and expensive, although there is no guarantee that the printing surface will last forever. In both of the forms of known printing platen described, there is also the risk that the relatively hard surface of this scratch-sensitive workpieces to be printed, e.g. Glass plates, enamel signs or the like. to be scratched. The surface of such printing platen itself is very sensitive to scratching.
  • a screen printing table with a support plate arranged on a frame for holding a workpiece to be printed is known, in which the surface of the support plate is covered by a self-adhesive plastic film.
  • the latter is intended to avoid damage to the support plate.
  • the plastic film should be easily replaced if it is damaged. This replacement of the plastic film is also time-consuming and costly.
  • the film adapts to the surface course of the carrier surface of the carrier plate, thus follows its course with its surface, so that there is no such flat surface, as would be required. There is also the risk that the film will peel off very quickly and easily, in particular also under the influence of temperature, solvents and / or mechanical forces acting thereon.
  • a method of the type mentioned at the outset is known (FR-A-2302198), in which a printing table is provided with a heating device which is intended to serve for faster drying.
  • the heating device has an underside insulating film made of plastic, on which heating elements in the form of electrical resistances and a frame formed from longitudinal struts and cross struts are placed.
  • the heating elements are embedded in a mass by introducing a mass into the interior bounded by the frame, which mass consists of a mixture of epoxy resin with hardener on the one hand and quartz sand on the other.
  • This mixture which has a relatively high viscosity, can be leveled, for example, by means of a doctor which rests on the longitudinal struts of the frame and is guided along it.
  • the mass hardens and forms a flat surface, which is covered with a foam rubber plate, on which a coating is applied, which forms the surface for placing the printing blanket on the printing table.
  • the top of the hardened mass should not deform, even if the printing table is only partially heated.
  • the production of the print run, in particular of such a printing table, is complex. Even if the mass mixture is made more uniform by means of a doctor blade, the high viscosity of the mass alone does not guarantee that a flat surface will appear when the mass hardens.
  • the invention is based on the problem of creating a method for producing a flat and large-area printing support surface for screen printing tables or the like, in which a highly flat printing surface and one that can be achieved in a very simple manner, even with large format, the requirements in the long run has grown and can be repaired and repaired quickly and easily if necessary.
  • the preferred synthetic resin casting compound is epoxy resin, which also acts as an adhesive, so that after hardening there is a uniformly firm adhesive bond between the resulting layer and the carrier surface of the carrier plate carrying this. It is also advantageous that this layer is sufficiently hard for the pressure on the one hand and on the other hand sufficiently elastic to compensate for stretching of the carrier surface material without the surface of the layer being changed adversely, any cracks or other damage occurring in the layer and without that the adhesive bond between the layer and the carrier surface is released.
  • the layer and also this adhesive connection are correspondingly solvent-resistant and / or temperature-resistant and / or mechanically easy to process, so that the layer itself is not damaged and the adhesive connection between the layer and the carrier surface is also fully retained. In the event of surface damage to the print support surface, this can be remedied quickly, easily and inexpensively by pouring out the damaged area with an appropriate synthetic resin casting compound. This increases the lifespan of each platen and thus increases its effectiveness.
  • the printing support surface formed by the layer also has the advantage that scratching of sensitive parts to be printed in this regard, for example glass plates, enamel plates or the like, cannot occur.
  • the material for the carrier plate, on the carrier surface of which the synthetic resin casting compound is applied is practically arbitrary, even if metal is preferably used and aluminum is preferred.
  • the method according to the invention is equally well suited both for the production of new printing support plates and for providing printing plates located in screen printing machines with a new printing support surface, if necessary.
  • the existing carrier plate can continue to be used, even if, depending on the individual case, the surface of the carrier plate is damaged or otherwise irregularly shaped, because such irregularities in the surface of the carrier surface are compensated for by the application of the easily flowable synthetic resin casting compound. Due to gravity, the liquid casting compound automatically has a flat surface, regardless of the nature of the underlying carrier surface. In these cases, too, a good and permanent adhesive bond is achieved between the layer and the carrier surface.
  • the invention further relates to a printing platen, which is produced by the method according to one or more of claims 1-23.
  • a printing platen of this type the object defined at the outset is achieved by the features in the characterizing part of claim 24.
  • a printing platen 10 is shown schematically, which is intended and suitable in particular for screen printing tables.
  • the pressure platen 10 is e.g. the plate of a printing table, as they are known per se in screen printing machines that work according to the surface printing process.
  • the platen 10 is e.g. interchangeably attached to the frame of the printing table. It can e.g. disassembled and treated for repair or other reasons.
  • the peculiarity of the printing platen 10 is that it has a layer 11 on the upper side which has a uniform and highly planar surface 12 which forms the printing platen when used as intended in the screen printing machine.
  • the layer 11 consists of a synthetic resin casting compound which is applied and hardened on a carrier surface 13 and adheres uniformly to it, the layer 11 compensating for any surface irregularities of the carrier surface 13, in particular dimensional and / or shape deviations from a flat surface, in that the layer 11 on its surface 12 is very even and, above all, highly flat and flat.
  • the platen 10 is with Large format advantage. It can be dimensioned so large that, for example, a printing format of 2000 x 4000 mm is possible with the screen printing machine. Despite this large format of the printing platen 10, the surface 12 is consistently uniform and highly flat.
  • the surface 12 can be repaired and leveled in the area of any damaged areas that may arise in the course of use by applying a liquid synthetic resin casting composition from which the layer 11 is made, and curing it, so that the printing platen 10 is thereby quick in such cases and can be easily and inexpensively repaired.
  • the layer 11 is temperature-resistant up to approximately 150 ° C., furthermore advantageously solvent-resistant and furthermore advantageously mechanically workable. It is therefore highly stable.
  • the good mechanical workability has the advantage that the layer 11 can be processed, for example, at the edges after the synthetic resin casting compound has hardened, and that, for example, if the pressure support plate 10 is to be designed as a vacuum pressure plate, the holes required for the vacuum, in particular bores , can be easily manufactured. Since this can involve a large number of individual cases, for example 10,000 or more holes, this is a considerable advantage.
  • the layer 11 is colored in a desired color, so that it thereby contrasts in color.
  • the layer thickness of layer 11 is arbitrary, at least within large limits.
  • the thickness of the layer 11 is, for example, approximately at least 3 mm.
  • the layer 11 is on the one hand sufficiently hard for printing and on the other hand sufficiently elastic that strains of the material of the carrier surface 13, for example due to mechanical forces, temperature-related or the like, are well compensated for without loss of flatness of the surface 12.
  • the layer 11 is in particular applied to a carrier plate 14 which has the carrier surface 13 and which is made of metal, e.g. Steel or aluminum in particular, or which is instead made of wood, a particle board, a sandwich design plate, a plate made of plastic or the like. can exist.
  • the layer 11 is permanently held firmly on the carrier plate 14 by the adhesive action of the applied and hardened synthetic resin casting compound.
  • the layer preferably consists of epoxy resin.
  • the edges of the platen 10 are not provided with a special edge finish.
  • a permanent edge protection 20 on the edge is provided.
  • the edge protection 20 overlaps the layer 11 in the edge region and is flush with the surface 12 of the layer 11.
  • the edge protector 20 is e.g.
  • angle profiles 21 which cover the end face of the pressure support plate 10 with one leg 22 and whose other leg 23 overlaps the layer 11 at the edge and outside the printing area.
  • This not only creates an edge protector 20 and a clean edge finish, but the edge-side angle profiles 21 can at the same time during the manufacture of the printing platen 10, in particular the layer 11, in the facing region of the legs 22 and 23 have a support surface 24 or 25 for the applied Form liquid synthetic resin casting compound. After the casting compound has hardened, depending on the individual case, the adhesive effect of this can already be sufficient to hold the angle profiles 21 firmly.
  • a method for producing a flat and in particular large-area print support surface, which is realized by the surface 12, in particular for screen printing tables, is explained below with reference to FIGS. 1 and 2.
  • This is based on a carrier plate 14 of the type described.
  • This can be a new carrier plate 14 or instead, for example in the event of a repair, such a carrier plate 14 which has a new one on its upper side corresponding planar printing surface in the form of surface 12 is to be provided.
  • the procedure is such that a thin-bodied and easily flowable synthetic resin casting compound, in particular epoxy resin, is applied to the carrier surface 13 and allowed to cure at least substantially without vibration for up to 7 days.
  • the liquid synthetic resin casting compound applied to the carrier surface 13 is allowed to run freely on the carrier surface 13 and is evenly distributed. If desired, the distribution can be accelerated after application by means of a bar or the like which is moved over the carrier surface 13.
  • the liquid synthetic resin casting compound is preferably applied to the carrier surface 13 in such a way that the casting compound is poured onto it, e.g. pours out.
  • application is also possible in another way, e.g. by spraying, suction by means of vacuum through an intermediate space or the like formed between a cover film and the carrier surface 13.
  • liquid synthetic resin casting compound applied is allowed to run and its surface can be adjusted flat and horizontally under gravity such as this also happens when pouring water into a tub. Since the applied synthetic resin casting compound is so thin and easily flowable, it distributes itself like water over the entire support surface 13, so that on the top of the still liquid casting compound analogous to the described example of water in a tub by itself due to gravity sets a highly flat course.
  • high support surfaces can be formed along the edges of the carrier surface 13, for example through the edge protection 20 in the form of the angle profiles 21, in the example according to FIG. 2 the support surfaces 24 and 25 which hold the liquid synthetic resin casting compound and prevent it from flowing away.
  • These towering support surfaces thus form a wall side towering formwork, which together with the support surface 13 forms a trough into which the easily flowable synthetic resin casting compound is entered.
  • the synthetic resin casting compound one is chosen, e.g. for these a mixing ratio such that there is a low viscosity which enables flow and free flow.
  • a casting compound is also chosen, e.g. such a mixing ratio that the resulting layer 11 on the one hand sufficiently hard e.g. for printing and, on the other hand, is sufficiently elastic so that the layer 11 can compensate for elongations of the carrier plate 14, which e.g. are caused by mechanical forces, temperature or other influences.
  • the layer 11 is in any case able to compensate for different expansion coefficients of the materials of the printing platen 10 without the layer losing its highly flat surface 12 and without the layer 11 being able to detach itself from the carrier surface 13 in an undesirable manner . Rather, the layer 11 adheres evenly and permanently firmly to the carrier surface 13 due to the excellent adhesion of the synthetic resin casting compound, since the casting compound is also effective as an adhesive.
  • the layer 11 is desired in color, this can be taken into account in that the synthetic resin casting compound or the like before application to the carrier surface 13 by introducing dyes. is first colored. It is advantageous if such a synthetic resin casting compound is applied, the hardened layer 11 of which, for example, is temperature-resistant up to approximately 150.degree. C., is also solvent-resistant and is also easy to machine.
  • the good mechanical Machinability proves to be an advantage, for example, if, after the casting compound has hardened, holes are to be made in the layer 11 formed and the carrier plate 14 located thereunder, for example if holes are to be provided, in order to form the pressure support plate 10 as a vacuum pressure plate. It may also be expedient in individual cases to mechanically process the surface 12 of the layer 11 on the edge in order to level any edges that are raised there.
  • edge-side support surfaces it has proven to be sufficient and extraordinarily simple, for example, for edge-side support surfaces to be removed later, if these protruding support surfaces are provided with edge strips, Self-adhesive tapes or the like. inexpensive elements that can be easily removed later.
  • the printing platen 10 produced in the manner described with the layer 11 consisting of plastic has a variety of advantages which have already been highlighted. This also includes the advantage that, due to the material from which the layer 11 with the surface 12 consists, scratching of sensitive materials to be printed, for example glass plates, enamel signs or the like. is avoided by the surface 12 of the layer 11. Layer 11 can be repaired and repaired quickly, easily and inexpensively, if necessary. As a result, a printing platen 10 can be used again after repair, so that a new purchase and the resulting high costs, possible machine downtime, loss of production, etc. can be avoided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Laminated Bodies (AREA)

Abstract

A method for manufacturing a flat and, in particular, large-area printing support especially for screen printing tables is proposed, in which method a liquid and readily flowable synthetic resin casting compound of, in particular, epoxy resin is applied to a base surface (13), which is bordered by upright support surfaces (24, 25) as an encasing, the compound is allowed to run freely and become evenly distributed and cure slowly. In this case, a flat and horizontal surface is produced automatically under the force of gravity so that a layer (11) is obtained after curing, whose surface (12), forming the printing support, is extremely level. Large-format printing support plates (10) can be produced quickly, simply and cost-effectively and repairs can be carried out on the surface of the layer. <IMAGE>

Description

Die Erfindung bezieht sich auf ein Verfahren zum Herstellen einer ebenen und großflächigen Druckauflagefläche für Siebdrucktische od. dgl., der im Oberbegriff des Anspruchs 1 genannten Art.The invention relates to a method for producing a flat and large-area printing support surface for screen printing tables or the like. The type mentioned in the preamble of claim 1.

Bei Siebdrucktischen mit ruhender Druckform (Sieb) und bewegter Rakel ist für die Auflage des zu bedruckenden Materials, z.B. Stoff, Glas, Emailschilder od.dgl., ein feststehender Drucktisch vorgesehen, der zum Belegen beispielsweise ausfahrbar ist. Dieser Drucktisch weist oberseitig eine Druckauflagefläche auf, die zur Gewährleistung eines hochqualitativen Siebdrucks plan sein muß. Bei bekannten Siebdruckmaschinen besteht diese Druckplatte des Drucktisches z.B. aus Metall, z.B. aus eloxiertem Aluminium. Bei der Ausbildung als Vakuumdrucktisch ist die Druckplatte als Vakuumdruckplatte ausgebildet, die eine Vielzahl von Löchern enthält, wobei auch in diesem Fall die Druckplatte z.B. aus Metall, insbesondere eloxiertem Aluminium, besteht. Derartige Druckplatten sind vor allem bei großformatigen Maschinen schwer, teuer und hinsichtlich ihrer planen Oberfläche empfindlich. Im Betrieb sind Beschädigungen der Oberfläche nicht ausgeschlossen. Dann ist es erforderlich, die Druckplatte auf ihrer Oberfläche zu reparieren, erforderlichenfalls neu zu planieren und zu eloxieren. Dies ist aufwendig und teuer. Außerdem dauert diese Prozedur meist einige Zeit, in der die Siebdruckmaschine nicht benutzt werden kann, so daß vor allem auch diese Stillstandszeiten von erheblichem Nachteil sind.In screen printing tables with a stationary printing form (screen) and a moving squeegee, a fixed printing table is provided for the support of the material to be printed, for example fabric, glass, enamel signs or the like. This printing table has a print surface on the top, which must be flat to ensure high-quality screen printing. In known screen printing machines, this printing plate of the printing table consists, for example, of metal, for example of anodized aluminum. When designed as a vacuum pressure table, the pressure plate is designed as a vacuum pressure plate which contains a multiplicity of holes, in which case the pressure plate also consists, for example, of metal, in particular anodized aluminum. Such printing plates are heavy, expensive, and sensitive to their flat surface, especially in large-format machines. Damage to the surface cannot be ruled out during operation. Then it is necessary to put the pressure plate on repairing their surface, leveling and anodizing if necessary. This is complex and expensive. In addition, this procedure usually takes some time in which the screen printing machine cannot be used, so that these downtimes in particular are a considerable disadvantage.

Es sind auch Druckauflageplatten bekannt, die auf ihrer Oberseite eine aufgeklebte, dünne Resopalschicht tragen. Diese ist empfindlich, hart und spröde, so daß diese Schicht sehr leicht beschädigt wird. Reparaturen dieser Schicht sind nicht möglich, weil dazu in einem sehr zeitaufwendigen und teuren Verfahren zunächst die Resopalschicht von der Trägerplatte entfernt werden müßte, wobei im übrigen die verbleibenden Resopalbereiche leicht brechen und sich nur schwer entfernen lassen. In solchen Fällen muß also eine neue Druckauflageplatte beigestellt werden, was aufwendig und teuer ist, wobei im übrigen auch dann keine Gewähr für dauerhafte Haltbarkeit der Druckoberfläche besteht. Bei beiden beschriebenen Formen von bekannten Druckauflageplatten besteht im übrigen die Gefahr, daß durch die relativ harte Oberfläche dieser kratzempfindliche zu bedruckende Werkstücke, z.B. Glasplatten, Emailschilder od.dgl. zerkratzt werden. Auch ist die Oberfläche derartiger Druckauflageplatten ihrerseits sehr kratzempfindlich.Printing support plates are also known which have a thin Formica layer glued on to their top side. This is sensitive, hard and brittle, so that this layer is very easily damaged. Repairs to this layer are not possible because the Formica layer would first have to be removed from the carrier plate in a very time-consuming and expensive process, the rest of the Formica areas breaking easily and being difficult to remove. In such cases, a new platen must be provided, which is time-consuming and expensive, although there is no guarantee that the printing surface will last forever. In both of the forms of known printing platen described, there is also the risk that the relatively hard surface of this scratch-sensitive workpieces to be printed, e.g. Glass plates, enamel signs or the like. to be scratched. The surface of such printing platen itself is very sensitive to scratching.

Aus der DE- A 38 23 853 ist ein Siebdrucktisch mit einer auf einem Gestell angeordneten Auflageplatte zur Halterung eines zu bedruckenden Werkstückes bekannt, bei dem die Oberfläche der Auflageplatte durch eine selbstklebende Kunststoffolie abgedeckt ist. Durch letztere sollen Beschädigungen der Auflageplatte vermieden werden. Die Kunststoffolie soll, sofern diese beschädigt ist, leicht ersetzt werden. Auch dieses Ersetzen der Kunststoffolie ist zeit- und kostenaufwendig. Die Folie paßt sich dem Oberflächenverlauf der Trägeroberfläche der Trägerplatte an, folgt also mit ihrer Oberfläche diesem Verlauf, so daß sich keine derart ebene Oberfläche, wie sie erforderlich wäre, ergibt. Auch besteht die Gefahr, daß sich die Folie sehr schnell und leicht ablöst, insbesondere auch unter Einwirkung von Temperatur, Lösungsmitteln und/oder darauf einwirkenden mechanischen Kräften.From DE-A 38 23 853 a screen printing table with a support plate arranged on a frame for holding a workpiece to be printed is known, in which the surface of the support plate is covered by a self-adhesive plastic film. The latter is intended to avoid damage to the support plate. The plastic film should be easily replaced if it is damaged. This replacement of the plastic film is also time-consuming and costly. The film adapts to the surface course of the carrier surface of the carrier plate, thus follows its course with its surface, so that there is no such flat surface, as would be required. There is also the risk that the film will peel off very quickly and easily, in particular also under the influence of temperature, solvents and / or mechanical forces acting thereon.

Es ist ein Verfahren der eingangs genannten Art bekannt (FR-A-2302198), bei dem ein Drucktisch mit einer Heizeinrichtung versehen ist, die der schnelleren Trocknung dienen soll. Die Heizeinrichtung weist eine unterseitige Isolierfolie aus Kunststoff auf, auf der Heizelemente in Form elektrischer Widerstände und ein aus Längsstreben und Querstreben gebildeter Rahmen aufgelegt sind. Die Heizelemente werden dadurch in eine Masse eingebettet, daß in das vom Rahmen umgrenzte Innere eine Masse eingebracht wird, die aus einem Gemisch aus Epoxidharz mit Härter einerseits und Quarzsand andererseits besteht. Dieses Gemisch, das eine relativ große Viskosität hat, kann z.B. mittels einer Rakel egalisiert werden, die auf den Längsstreben des Rahmens aufliegt und entlang diesen geführt wird. Die Masse härtet aus und bildet eine ebene Oberfläche, die mit einer Moosgummiplatte bedeckt wird, auf der ein Überzug aufgebracht wird, der die Oberfläche zum Auflegen des Drucktuches des Drucktisches bildet. Die Oberseite der ausgehärteten Masse soll sich nicht verformen, selbst dann, wenn der Drucktisch nur teilweise beheizt ist. Die Herstellung der Druckauflage, insbesondere eines solchen Drucktisches, ist aufwendig. Auch wenn das Massengemisch mittels einer Rakel vergleichmäßigt wird, ist schon aufgrund der hohen Viskosität der Masse nicht gewährleistet, daß sich eine ebene Oberfläche beim Aushärten der Masse einstellt.A method of the type mentioned at the outset is known (FR-A-2302198), in which a printing table is provided with a heating device which is intended to serve for faster drying. The heating device has an underside insulating film made of plastic, on which heating elements in the form of electrical resistances and a frame formed from longitudinal struts and cross struts are placed. The heating elements are embedded in a mass by introducing a mass into the interior bounded by the frame, which mass consists of a mixture of epoxy resin with hardener on the one hand and quartz sand on the other. This mixture, which has a relatively high viscosity, can be leveled, for example, by means of a doctor which rests on the longitudinal struts of the frame and is guided along it. The mass hardens and forms a flat surface, which is covered with a foam rubber plate, on which a coating is applied, which forms the surface for placing the printing blanket on the printing table. The top of the hardened mass should not deform, even if the printing table is only partially heated. The production of the print run, in particular of such a printing table, is complex. Even if the mass mixture is made more uniform by means of a doctor blade, the high viscosity of the mass alone does not guarantee that a flat surface will appear when the mass hardens.

Der Erfindung liegt die Aufgaoe zugrunde, ein Verfahren zum Herstellen einer ebenen und großflächigen Druckauflagefläche für Siebdrucktische od. dgl., zu schaffen, bei dem in sehr einfacher Weise eine hochgradig ebene Druckoberfläche und eine solche erzielbar ist, die selbst bei Großformat den Anforderungen auf Dauer gewachsen ist und die sich schnell und einfach bedarfsweise ausbessern und reparieren läßt.The invention is based on the problem of creating a method for producing a flat and large-area printing support surface for screen printing tables or the like, in which a highly flat printing surface and one that can be achieved in a very simple manner, even with large format, the requirements in the long run has grown and can be repaired and repaired quickly and easily if necessary.

Die Aufgabe ist bei einem Verfahren der eingangs genannten Art gemäß der Erfindung durch die Merkmale im Kennzeichnungsteil des Anspruchs 1 gelöst. Vorteilhafte weitere Erfindungsmerkmale und Ausgestaltungen dieses Verfahrens ergeben sich aus den Ansprüchen 2 - 23.The object is achieved in a method of the type mentioned according to the invention by the features in the characterizing part of claim 1. Advantageous further features of the invention and refinements of this method result from claims 2-23.

Dadurch, daß man auf eine Trägeroberfläche eine dünnflüssige und leicht fließfähige Kunstharz-Gießmasse aufbringt und aushärten läßt, wird schnell, einfach und kostengünstig selbst bei großformatiger Ausführung eine Druckauflagefläche erzeugt, die in hohem Maße plan und eben ist; denn aufgrund der Dünnflüssigkeit der aufgebrachten Kunstharz-Gießmasse verhält sich diese ähnlich Wasser in einer Wanne, das bei erschütterungsarmer, weitestgehend resonanzfreier Aufstellung der Wanne sich selbsttätig und unter der Wirkung der Schwerkraft mit seiner Oberfläche plan und horizontal einstellt. In gleicher Weise verhält sich die dünnflüssige Kunstharz-Gießmasse, die man auf eine Trägeroberfläche aufbringt und durch randseitig hochragende Stützflächen, die eine Schalung bilden, am Abfließen hindert, so daß die Stützflächen mitsamt der Trägeroberfläche quasi ein Aufnahmebecken für die dünnflüssige Gießmasse bilden, die sich somit wie Wasser selbsttätig mit ihrer Oberfläche plan und horizontal einstellt. Dies gibt die Gewähr für eine hochgradig plane Oberfläche nach dem Aushärten der Kunstharz-Gießmasse, und zwar selbst für Großformate, die in der Größenordnung von 2000 x 4000 mm Druckformat liegen können. Als KunstharzGießmasse eignet sich mit Vorzug Epoxidharz, das zugleich als Kleber wirksam ist, so daß sich nach dem Aushärten eine gleichmäßig feste Klebeverbindung zwischen der entstehenden Schicht und der diese tragenden Trägeroberfläche der Trägerplatte ergibt. Von Vorteil ist ferner, daß diese Schicht einerseits für den Druck ausreichend hart und andererseits wiederum ausreichend elastisch ist, um Dehnungen des Trägeroberflächenmaterials ausgleichen zu können, ohne daß die Oberfläche der Schicht sich nachteilig verändert, etwaige Risse oder sonstige Schäden in der Schicht entstehen und ohne daß sich die Klebeverbindung zwischen der Schicht und der Trägeroberfläche löst. Die Schicht und auch diese Klebeverbindung ist entsprechend lösungsmittelbeständig und/oder temperaturbeständig und/oder mechanisch gut bearbeitbar, wobei also auch dann die Schicht selbst keinen Schaden nimmt und auch die Klebeverbindung zwischen der Schicht und der Trägeroberfläche voll erhalten bleibt. Im Falle von Oberflächenschäden der Druckauflagefläche lassen sich diese schnell, einfach und kostengünstig beheben, indem der beschädigte Bereich mit entsprechender Kunstharz-Gießmasse ausgegossen wird. Dadurch wird die Lebensdauer jeder Druckauflageplatte und damit die Effektivität dieser gesteigert. Die durch die Schicht gebildete Druckauflagefläche hat außerdem den Vorteil, daß ein Zerkratzen diesbezüglich empfindlicher zu bedruckender Teile, z.B. von Glasplatten, Emailplatten od.dgl., nicht vorkommen kann. Bei allem versteht es sich, daß das Material für die Trägerplatte, auf deren Trägeroberfläche die Kunstharz-Gießmasse aufgebracht wird, praktisch beliebig ist, auch wenn mit Vorzug Metall und hierbei mit Vorzug Aluminium eingesetzt wird. Bei allem versteht es sich, daß das erfindungsgemäße Verfahren sowohl für die Neuherstellung von Druckauflageplatten als auch dafür gleichermaßen gut geeignet ist, in Siebdruckmaschinen befindliche Oruckplatten erforderlichenfalls mit einer neuen Oruckauflagefläche zu versehen. Dabei kann die vorhandene Trägerplatte weiter benutzt werden, selbst wenn je nach Einzelfall deren Oberfläche beschädigt oder sonstwie unregelmäßig gestaltet sein sollte, denn durch das Aufbringen der leicht fließfähigen Kunstharz-Gießmasse werden derartige Oberflächenunregelmäßigkeiten der Trägerooerfläche ausgeglichen. Durch Schwerkraft stellt sich bei der flüssigen Gießmasse von selbst eine plane Oberfläche ein, unabhängig davon,wie die Beschaffenheit der darunter befindlichen Trägeroberfläche ist. Auch in diesen Fällen wird eine gute und dauerhafte Klebverbindung zwischen der Schicht und der Trägeroberfläche erreicht.The fact that a thin and easy-to-flow synthetic resin casting compound is applied and allowed to harden on a carrier surface produces a print support surface which is to a large extent flat and even; Because due to the thin liquid of the applied synthetic resin casting compound, this behaves similarly to water in a tub, which sets itself flat and horizontally under the effect of gravity with its surface with little vibration, largely resonance-free installation of the tub. In the same way, the low-viscosity synthetic resin casting compound, which is applied to a carrier surface and prevented from flowing off by supporting surfaces, which form a formwork, protrude, so that the supporting surfaces, together with the supporting surface, virtually form a receiving basin for the low-viscosity casting compound which is formed Consequently how water automatically sets itself flat and horizontally with its surface. This guarantees a highly flat surface after the resin casting compound has hardened, even for large formats that can be in the order of 2000 x 4000 mm print format. The preferred synthetic resin casting compound is epoxy resin, which also acts as an adhesive, so that after hardening there is a uniformly firm adhesive bond between the resulting layer and the carrier surface of the carrier plate carrying this. It is also advantageous that this layer is sufficiently hard for the pressure on the one hand and on the other hand sufficiently elastic to compensate for stretching of the carrier surface material without the surface of the layer being changed adversely, any cracks or other damage occurring in the layer and without that the adhesive bond between the layer and the carrier surface is released. The layer and also this adhesive connection are correspondingly solvent-resistant and / or temperature-resistant and / or mechanically easy to process, so that the layer itself is not damaged and the adhesive connection between the layer and the carrier surface is also fully retained. In the event of surface damage to the print support surface, this can be remedied quickly, easily and inexpensively by pouring out the damaged area with an appropriate synthetic resin casting compound. This increases the lifespan of each platen and thus increases its effectiveness. The printing support surface formed by the layer also has the advantage that scratching of sensitive parts to be printed in this regard, for example glass plates, enamel plates or the like, cannot occur. With everything, it goes without saying that the material for the carrier plate, on the carrier surface of which the synthetic resin casting compound is applied, is practically arbitrary, even if metal is preferably used and aluminum is preferred. With everything, it goes without saying that that The method according to the invention is equally well suited both for the production of new printing support plates and for providing printing plates located in screen printing machines with a new printing support surface, if necessary. The existing carrier plate can continue to be used, even if, depending on the individual case, the surface of the carrier plate is damaged or otherwise irregularly shaped, because such irregularities in the surface of the carrier surface are compensated for by the application of the easily flowable synthetic resin casting compound. Due to gravity, the liquid casting compound automatically has a flat surface, regardless of the nature of the underlying carrier surface. In these cases, too, a good and permanent adhesive bond is achieved between the layer and the carrier surface.

Die Erfindung bezieht sich ferner auf eine Druckauflageplatte, die nach dem Verfahren gemäß einem oder mehreren der Ansprüche 1 - 23 hergestellt ist. Bei einer Oruckauflageplatte dieser Art ist die eingangs definierte Aufgabe durch die Merkmale im Kennzeichnungsteil des Anspruchs 24 gelöst. Vorteilhafte Weiterbildungen der Erfindung und Ausgestaltungen dazu ergeben sich aus den Ansprüchen 25 - 36.The invention further relates to a printing platen, which is produced by the method according to one or more of claims 1-23. In the case of a printing platen of this type, the object defined at the outset is achieved by the features in the characterizing part of claim 24. Advantageous further developments of the invention and refinements thereon result from claims 25-36.

Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung, auf die hier zur Vermeidung unnötiger Wiederholungen verwiesen ist.Further details and advantages of the invention result from the following description, to which reference is made here to avoid unnecessary repetitions.

Der vollständige Wortlaut der Ansprüche ist vorstehend allein zur Vermeidung unnötiger Wiederholungen nicht wiedergegeben, sondern statt dessen lediglich durch Nennung der Anspruchsnummern darauf Bezug genommen, wodurch jedoch alle diese Anspruchsmerkmale als an dieser Stelle ausdrücklich und erfindungswesentlich offenbart zu gelten haben. Dabei sind alle in der vorstehenden und folgenden Beschreibung erwähnten Merkmale sowie auch die allein aus der Zeichnung entnehmbaren Merkmale weitere Bestandteile der Erfindung, auch wenn sie nicht besonders hervorgehoben und nicht in den Ansprüchen erwähnt sind.The full wording of the claims is not reproduced above solely in order to avoid unnecessary repetition, but instead is referred to only by mentioning the claim numbers, whereby all these features of the claim are to be regarded as being explicitly disclosed here and essential to the invention. All are mentioned in the above and following description Features as well as the features only from the drawing further components of the invention, even if they are not particularly emphasized and are not mentioned in the claims.

Die Erfindung ist nachfolgend anhand von in der Zeichnung gezeigten Ausführungsbeispielen näher erläutert. Es zeigen:

Fig. 1
eine schematische, teilweise geschnittene Perspektivansicht einer Druckauflageplatte gemäß einem ersten Ausführungsbeispiel,
Fig. 2
eine schematische, teilweise geschnittene Perspektivansicht einer Druckauflageplatte gemäß einem zweiten Ausführungsbeispiel.
The invention is explained in more detail below with reference to exemplary embodiments shown in the drawing. Show it:
Fig. 1
2 shows a schematic, partially sectioned perspective view of a printing platen according to a first exemplary embodiment,
Fig. 2
is a schematic, partially sectioned perspective view of a printing platen according to a second embodiment.

In Fig. 1 ist schematisch eine Druckauflageplatte 10 gezeigt, die insbesondere für Siebdrucktische bestimmt und geeignet ist. Die Druckauflageplatte 10 ist dabei z.B. die Platte eines Drucktisches, wie sie bei Siebdruckmaschinen, die nach dem Flächendruckverfahren arbeiten, an sich geläufig sind. Die Druckauflageplatte 10 wird z.B. auswechselbar am Gestell des Drucktisches angebracht. Sie kann z.B. zu Reparaturzwecken oder aus sonstigen Gründen demontiert und nachbehandelt werden.In Fig. 1, a printing platen 10 is shown schematically, which is intended and suitable in particular for screen printing tables. The pressure platen 10 is e.g. the plate of a printing table, as they are known per se in screen printing machines that work according to the surface printing process. The platen 10 is e.g. interchangeably attached to the frame of the printing table. It can e.g. disassembled and treated for repair or other reasons.

Die Besonderheit der Druckauflageplatte 10 besteht darin, daß diese oberseitig eine Schicht 11 aufweist, die eine gleichmäßige und hochgradig plan ausgebildete Oberfläche 12 besitzt, die beim bestimmungsgemäßen Gebrauch in der Siebdruckmaschine die Druckauflagefläche bildet. Die Schicht 11 besteht aus einer Kunstharz-Gießmasse, die auf einer Trägeroberfläche 13 aufgebracht und ausgehärtet ist und darauf gleichmäßig klebend haftet, wobei die Schicht 11 etwaige Oberflächenunregelmäßigkeiten der Trägeroberfläche 13, insbesondere Maß- und/oder Formabweichungen von einer Planfläche, dadurch egalisiert, daß die Schicht 11 auf ihrer Oberfläche 12 sehr gleichmäßig und vor allem hochgradig eben und plan gestaltet ist. Die Druckauflageplatte 10 ist mit Vorteil großformatig. Sie kann so groß dimensioniert sein, daß z.B. ein Druckformat von 2000 x 4000 mm bei der Siebdruckmaschine möglich ist. Trotz dieses Großformats der Druckauflageplatte 10 ist die Oberfläche 12 durchgängig gleichmäßig und hochgradig plan.The peculiarity of the printing platen 10 is that it has a layer 11 on the upper side which has a uniform and highly planar surface 12 which forms the printing platen when used as intended in the screen printing machine. The layer 11 consists of a synthetic resin casting compound which is applied and hardened on a carrier surface 13 and adheres uniformly to it, the layer 11 compensating for any surface irregularities of the carrier surface 13, in particular dimensional and / or shape deviations from a flat surface, in that the layer 11 on its surface 12 is very even and, above all, highly flat and flat. The platen 10 is with Large format advantage. It can be dimensioned so large that, for example, a printing format of 2000 x 4000 mm is possible with the screen printing machine. Despite this large format of the printing platen 10, the surface 12 is consistently uniform and highly flat.

Die Oberfläche 12 ist im Bereich etwaiger Schadstellen, die sich möglicherweise im Laufe der Benutzungszeit einstellen, durch Aufbringen einer flüssigen Kunstharz-Gießmasse, aus der die Schicht 11 besteht, und Aushärten dieser reparierbar und egalisierbar, so daß die Druckauflageplatte 10 dadurch in derartigen Fällen schnell und einfach und kostengünstig repariert werden kann.The surface 12 can be repaired and leveled in the area of any damaged areas that may arise in the course of use by applying a liquid synthetic resin casting composition from which the layer 11 is made, and curing it, so that the printing platen 10 is thereby quick in such cases and can be easily and inexpensively repaired.

Die Schicht 11 ist bis etwa 150°C temperaturbeständig, ferner mit Vorteil lösungsmittelbeständig und ferner in vorteilhafter Weise gut mechanisch bearbeitbar. Sie ist daher in hohem Maße beständig. Die gute mechanische Bearbeitbarkeit hat den Vorteil, daß sich die Schicht 11 nach dem Aushärten der Kunstharz-Gießmasse z.B. an den Rändern bearbeiten läßt und daß z.B. dann, wenn die Druckauflageplatte 10 als Vakuumdruckplatte ausgebildet sein soll, die für das Vakuum erforderlichen Löcher, insbesondere Bohrungen, problemlos hergestellt werden können. Da es sich in diesem Fall um eine Vielzahl von je Einzelfall z.B. von 10000 und mehr Löchern handeln kann, ist dies ein erheblicher Vorteil. Bedarfsweise ist die Schicht 11 in einer gewünschten Farbe eingefärbt, so daß sie sich dadurch farblich absetzt. Die Schichtdicke der Schicht 11 ist zumindest in großen Grenzen beliebig. Von Vorteil kann es sein, wenn die Dicke der Schicht 11 z.B. etwa mindestens 3 mm beträgt. Die Schicht 11 ist einerseits insbesondere zum Drucken genügend hart und andererseits so ausreichend elastisch, daß Dehnungen des Materials der Trägeroberfläche 13, z.B. aufgrund mechanischer Kräfte, temperaturbedingt od.dgl., ohne Verlust an Ebenheit der Oberfläche 12 gut ausgeglichen werden.The layer 11 is temperature-resistant up to approximately 150 ° C., furthermore advantageously solvent-resistant and furthermore advantageously mechanically workable. It is therefore highly stable. The good mechanical workability has the advantage that the layer 11 can be processed, for example, at the edges after the synthetic resin casting compound has hardened, and that, for example, if the pressure support plate 10 is to be designed as a vacuum pressure plate, the holes required for the vacuum, in particular bores , can be easily manufactured. Since this can involve a large number of individual cases, for example 10,000 or more holes, this is a considerable advantage. If necessary, the layer 11 is colored in a desired color, so that it thereby contrasts in color. The layer thickness of layer 11 is arbitrary, at least within large limits. It can be advantageous if the thickness of the layer 11 is, for example, approximately at least 3 mm. The layer 11 is on the one hand sufficiently hard for printing and on the other hand sufficiently elastic that strains of the material of the carrier surface 13, for example due to mechanical forces, temperature-related or the like, are well compensated for without loss of flatness of the surface 12.

Die Schicht 11 ist insbesondere auf einer die Trägeroberfläche 13 aufweisenden Trägerplatte 14 aufgebracht, die aus Metall, z.B. Stahl oder insbesondere Aluminium, besteht oder die statt dessen auch aus Holz, einer Spanplatte, einer in Sandwichbauweise gestalteten Platte, einer Platte aus Kunststoff od.dgl. bestehen kann. Die Schicht 11 ist auf der Trägerplatte 14 dauerhaft fest gehalten, und zwar durch Klebwirkung der aufgebrachten und ausgehärteten Kunstharz-Gießmasse. Mit Vorzug besteht die Schicht aus Epoxidharz. Beim ersten Ausführungsbeispiel sind die Kanten der Druckauflageplatte 10 nicht mit einem besonderen Kantenabschluß versehen. Beim zweiten Ausführungsbeispiel in Fig. 2 dagegen ist ein randseitiger, bleibender Kantenschutz 20 vorgesehen. Der Kantenschutz 20 übergreift die Schicht 11 im Randbereich und schließt bündig mit der Oberfläche 12 der Schicht 11 ab. Der Kantenschutz 20 ist z.B. mittels Winkelprofilen 21 gebildet, die mit einem Schenkel 22 die Stirnseite der Druckauflageplatte 10 überdecken und deren anderer Schenkel 23 die Schicht 11 randseitig und außerhalb des Druckbereichs übergreift. Dadurch ist nicht nur ein Kantenschutz 20 und sauberer Kantenabschluß geschaffen, sondern die randseitigen Winkelprofile 21 können zugleich bei der Herstellung der Druckauflageplatte 10, insbesondere der Schicht 11, im zugewandten Bereich der Schenkel 22 und 23 eine Stützfläche 24 bzw. 25 für die aufgebrachte, noch flüssige Kunstharz-Gießmasse bilden. Nach Aushärten der Gießmasse kann je nach Einzelfall bereits die Klebwirkung dieser zur festen Halterung der Winkelprofile 21 ausreichen.The layer 11 is in particular applied to a carrier plate 14 which has the carrier surface 13 and which is made of metal, e.g. Steel or aluminum in particular, or which is instead made of wood, a particle board, a sandwich design plate, a plate made of plastic or the like. can exist. The layer 11 is permanently held firmly on the carrier plate 14 by the adhesive action of the applied and hardened synthetic resin casting compound. The layer preferably consists of epoxy resin. In the first embodiment, the edges of the platen 10 are not provided with a special edge finish. In the second exemplary embodiment in FIG. 2, on the other hand, a permanent edge protection 20 on the edge is provided. The edge protection 20 overlaps the layer 11 in the edge region and is flush with the surface 12 of the layer 11. The edge protector 20 is e.g. formed by angle profiles 21, which cover the end face of the pressure support plate 10 with one leg 22 and whose other leg 23 overlaps the layer 11 at the edge and outside the printing area. This not only creates an edge protector 20 and a clean edge finish, but the edge-side angle profiles 21 can at the same time during the manufacture of the printing platen 10, in particular the layer 11, in the facing region of the legs 22 and 23 have a support surface 24 or 25 for the applied Form liquid synthetic resin casting compound. After the casting compound has hardened, depending on the individual case, the adhesive effect of this can already be sufficient to hold the angle profiles 21 firmly.

Nachfolgend ist unter Bezugnahme auf Fig. 1 und 2 ein Verfahren zum Herstellen einer ebenen und insbesondere großflächigen Druckauflagefläche, die durch die Oberfläche 12 verwirklicht ist, insbesondere für Siebdrucktische, erläutert. Dabei geht man von einer Trägerplatte 14 beschriebener Art aus. Hierbei kann es sich um eine neue Trägerplatte 14 handeln oder statt dessen auch, z.B. im Reparaturfall, um eine solche Trägerplatte 14, die auf ihrer Oberseite mit einer neuen entsprechenden ebenen Druckauflagefläche in Form der Oberfläche 12 versehen werden soll.A method for producing a flat and in particular large-area print support surface, which is realized by the surface 12, in particular for screen printing tables, is explained below with reference to FIGS. 1 and 2. This is based on a carrier plate 14 of the type described. This can be a new carrier plate 14 or instead, for example in the event of a repair, such a carrier plate 14 which has a new one on its upper side corresponding planar printing surface in the form of surface 12 is to be provided.

Bei diesem Verfahren geht man so vor, daß man auf die Trägeroberfläche 13 eine dünnflüssige und leicht fließfähige Kunstharz-Gießmasse, insbesondere Epoxidharz, aufbringt und etwa bis zu 7 Tage zumindest im wesentlichen erschütterungsfrei aushärten läßt. Dabei läßt man die auf die Trägeroberfläche 13 aufgebrachte flüssige Kunstharz-Gießmasse auf der Trägeroberfläche 13 frei verlaufen und sich gleichmäßig verteilen. Sofern gewünscht, kann die Verteilung nach dem Aufbringen mittels einer Leiste od.dgl., die über die Trägeroberfläche 13 hinwegbewegt wird, beschleunigt werden. Die flüssige Kunstharz-Gießmasse bringt man vorzugsweise derart auf die Trägerfläche 13 auf, daß man die Gießmasse darauf schüttet, z.B. ausgießt. Gleichwohl ist ein Aufbringen auch in anderer Weise möglich, z.B. durch Aufspritzen, Ansaugen mittels Vakuums durch einen zwischen einer Deckfolie und der Trägeroberfläche 13 gebildeten Zwischenraum od.dgl.. Wichtig ist dabei, daß man die aufgebrachte flüssige Kunstharz-Gießmasse verlaufen läßt und sich selbttätig unter der Schwerkraft mit ihrer Oberfläche plan und horizontal einstellen läßt, wie dies z.B. bei Einfüllen von Wasser in eine Wanne auch geschieht. Da die aufgebrachte kUnstharz-Gießmasse derart dünnflüssig und leicht fließfähig ist, verteilt sich diese ähnlich Wasser von selbst über die gesamte Trägeroberfläche 13, so daß sich auf der Oberseite der noch flüssigen Gießmasse analog dem beschriebenen Beispiel von Wasser in einer Wanne von selbst infolge Schwerkraft ein hochgradig ebener Verlauf einstellt.In this process, the procedure is such that a thin-bodied and easily flowable synthetic resin casting compound, in particular epoxy resin, is applied to the carrier surface 13 and allowed to cure at least substantially without vibration for up to 7 days. The liquid synthetic resin casting compound applied to the carrier surface 13 is allowed to run freely on the carrier surface 13 and is evenly distributed. If desired, the distribution can be accelerated after application by means of a bar or the like which is moved over the carrier surface 13. The liquid synthetic resin casting compound is preferably applied to the carrier surface 13 in such a way that the casting compound is poured onto it, e.g. pours out. However, application is also possible in another way, e.g. by spraying, suction by means of vacuum through an intermediate space or the like formed between a cover film and the carrier surface 13. It is important here that the liquid synthetic resin casting compound applied is allowed to run and its surface can be adjusted flat and horizontally under gravity such as this also happens when pouring water into a tub. Since the applied synthetic resin casting compound is so thin and easily flowable, it distributes itself like water over the entire support surface 13, so that on the top of the still liquid casting compound analogous to the described example of water in a tub by itself due to gravity sets a highly flat course.

Dabei kann man längs der Ränder der Trägeroberfläche 13 - z.B. durch den Kantenschutz 20 in Form der Winkelprofile 21 - hochragende Stützflächen bilden, beim Beispiel gemäß Fig. 2 somit die Stützflächen 24 und 25, die die flüssige Kunstharz-Gießmasse halten und am Wegfließen hindern. Diese hochragenden Stützflächen bilden somit eine wandseitige hochragende Schalung, die zusammen mit der Trägeroberfläche 13 eine Wanne bildet, in die die leicht fließfähige Kunstharz-Gießmasse eingegeben wird.In this case, high support surfaces can be formed along the edges of the carrier surface 13, for example through the edge protection 20 in the form of the angle profiles 21, in the example according to FIG. 2 the support surfaces 24 and 25 which hold the liquid synthetic resin casting compound and prevent it from flowing away. These towering support surfaces thus form a wall side towering formwork, which together with the support surface 13 forms a trough into which the easily flowable synthetic resin casting compound is entered.

Wenn man für die nach Aushärtung entstehende Schicht 11 eine Schichtdicke von mindestens 3 mm anstrebt, so füllt man eine entsprechende Menge flüssiger Kunstharz-Gießmasse in diese Wanne ein, so daß sich ein entsprechender Flüssigkeitsstand von etwa mindestens 3 mm einstellt.If one strives for a layer thickness of at least 3 mm for the layer 11 formed after curing, a corresponding amount of liquid synthetic resin casting compound is poured into this trough, so that a corresponding liquid level of approximately at least 3 mm is established.

Hinsichtlich der Kunstharz-Gießmasse wählt man eine solche, z.B. für diese ein derartiges Mischungsverhältnis, daß sich eine ein Fließen und freies Verlaufen ermöglichende geringe Viskosität ergibt. Ferner wählt man eine solche Gießmasse, z.B. ein solches Mischungsverhältnis, daß die nach Aushärten sich ergebende Schicht 11 einerseits genügend hart z.B. zum Drucken ist und andererseits ausreichend elastisch ist, so daß die Schicht 11 Dehnungen der Trägerplatte 14 ausgleichen kann, die z.B. durch mechanische Kräfte, durch Temperatur oder sonstige Einflüsse bedingt sind. Die Schicht 11 ist auf jeden Fall ind er Lage, unterschiedliche Ausdehnungskoeffizienten der Materialien der Druckauflageplatte 10 zu kompensieren, ohne daß die Schicht ihre hochgradig plane Oberfläche 12 dabei einbüßt und ohne daß sich die Schicht 11 dabei von der Trägeroberfläche 13 etwa in unerwünschter Weise ablösen kann. Vielmehr haftet die Schicht 11 aufgrund des vorzüglichen Haftvermögens der Kunstharz-Gießmasse gleichmäßig und dauerhaft fest auf der Trägeroberfläche 13, da die Gießmasse zugleich als Kleber wirksam ist.With regard to the synthetic resin casting compound, one is chosen, e.g. for these a mixing ratio such that there is a low viscosity which enables flow and free flow. Such a casting compound is also chosen, e.g. such a mixing ratio that the resulting layer 11 on the one hand sufficiently hard e.g. for printing and, on the other hand, is sufficiently elastic so that the layer 11 can compensate for elongations of the carrier plate 14, which e.g. are caused by mechanical forces, temperature or other influences. The layer 11 is in any case able to compensate for different expansion coefficients of the materials of the printing platen 10 without the layer losing its highly flat surface 12 and without the layer 11 being able to detach itself from the carrier surface 13 in an undesirable manner . Rather, the layer 11 adheres evenly and permanently firmly to the carrier surface 13 due to the excellent adhesion of the synthetic resin casting compound, since the casting compound is also effective as an adhesive.

Wenn die Schicht 11 in Farbe gewünscht wird, so kann dies dadurch berücksichtigt werden, daß die Kunstharz-Gießmasse vor dem Aufbringen auf die Trägeroberfläche 13 durch Einbringen von Farbstoffen od.dgl. zunächst eingefärbt wird. Von Vorteil ist es, wenn man eine solche Kunstharz-Gießmasse aufbringt,deren ausgehärtete Schicht 11 z.B. etwa bis 150°C temperaturbeständig, ferner lösungsmittelbeständig und außerdem mechanisch gut bearbeitbar ist. Die gute mechanische Bearbeitbarkeit erweist sich z.B. dann als Vorteil, wenn man nach dem Aushärten der Gießmasse in die gebildete Schicht 11 und die darunter befindliche Trägerplatte 14 bedarfsweise Löcher einbringen will, z.B. Bohrungen vorsehen will, um die Druckauflageplatte 10 als Vakuumdruckplatte auszubilden. Auch kann es je Einzelfall zweckmäßig sein, die Oberfläche 12 der Schicht 11 randseitig mechanisch zu bearbeiten, um etwaige dort hochgezogene Ränder oberseitig zu planieren.If the layer 11 is desired in color, this can be taken into account in that the synthetic resin casting compound or the like before application to the carrier surface 13 by introducing dyes. is first colored. It is advantageous if such a synthetic resin casting compound is applied, the hardened layer 11 of which, for example, is temperature-resistant up to approximately 150.degree. C., is also solvent-resistant and is also easy to machine. The good mechanical Machinability proves to be an advantage, for example, if, after the casting compound has hardened, holes are to be made in the layer 11 formed and the carrier plate 14 located thereunder, for example if holes are to be provided, in order to form the pressure support plate 10 as a vacuum pressure plate. It may also be expedient in individual cases to mechanically process the surface 12 of the layer 11 on the edge in order to level any edges that are raised there.

Auch wenn beim Beispiel in Fig. 1 und 2 eine Trägerplatte 14 gezeigt ist, versteht es sich gleichwohl, daß für die Herstellung großformatiger Druckauflageplatten 10 auch z.B. mehrere derartige Trägerplatten 14 aneinandergesetzt und miteinander fest verbunden werden können und daß danach auf die Trägeroberfläche 13 einer solchen Trägerplatteneinheit dann die flüssige Kunstharz-Gießmasse aufgebracht wird, die sich dann auch über die Stoßstellen zwischen den einzelnen Trägerplatten hinweg gleichmäßig und frei verlaufend über die gesamte Trägeroberfläche verteilt. Dabei entstehen also keine Einfallstellen, Nuten od.dgl. Rillen in den Stoßbereichen der einzelnen Trägerplatte, so daß auch in diesem Fall eine hochgradig plane und in dieser Weise durchgehende Oberfläche 12 als Druckauflagefläche erreicht wird.Even if a support plate 14 is shown in the example in FIGS. 1 and 2, it goes without saying that for the production of large-format printing platen 10 also e.g. several such carrier plates 14 can be put together and firmly connected to one another and then the liquid synthetic resin casting compound is then applied to the carrier surface 13 of such a carrier plate unit, which then also runs smoothly and freely over the entire carrier surface over the joints between the individual carrier plates distributed. So there are no sink marks, grooves or the like. Grooves in the abutting areas of the individual carrier plates, so that a highly flat and continuous surface 12 is also achieved in this case as a pressure bearing surface.

Auch wenn man die auf die Trägeroberfläche 13 aufgebrachte flüssige Kunstharz-Gießmasse etwa bis zu 7 Tagen im wesentlichen erschütterungsfrei aushärten läßt, ist es möglich, daß man die hochragenden randseitigen Stützflächen etwa nach 3 - 4 Tagen der Aushärtezeit der Gießmasse schon entfernt, sofern man diese hochragenden Stützflächen nicht so, wie beim Ausführungsbeispiel in Fig. 2 verdeutlicht ist, als Kantenabschluß, z.B. Kantenschutz 20, ausbildet und nach dem Aushärten der Gießmasse als bleibenden Rand beläßt.Even if the liquid synthetic resin casting compound applied to the carrier surface 13 is allowed to harden substantially without vibration for up to 7 days, it is possible that the protruding supporting surfaces on the edge are removed after about 3-4 days of the hardening time of the casting compound, provided that this is done towering support surfaces not as is illustrated in the exemplary embodiment in FIG. 2, as an edge closure, for example Edge protection 20, forms and leaves as a permanent edge after the casting compound has hardened.

Es hat sich z.B. für später zu entfernende randseitige Stützflächen als ausreichend und außerordentlich einfach erwiesen, wenn man diese hochragenden Stützflächen durch Randleisten, Selbstklebebänder od.dgl. kostengünstige Elemente, die man später auch leicht entfernen kann, bildet.It has proven to be sufficient and extraordinarily simple, for example, for edge-side support surfaces to be removed later, if these protruding support surfaces are provided with edge strips, Self-adhesive tapes or the like. inexpensive elements that can be easily removed later.

Eine weitere wesentliche Verfahrensmaßnahme beim Herstellen liegt in folgendem. Bei der Verarbeitung beschriebener Kunstharz-Gießmassen ist die Bildung von Luftblasen unvermeidlich. Es kann daher vorteilhaft sein, wenn man nach dem Aufbringen der Kunstharz-Gießmasse und nach einer vorgegebenen Zeit, z.B. etwa in der Größenordnung von 30 Minuten, an der Oberfläche der Gießmasse vorhandene Luftblasen beseitigt. Wartet man mit der Luftblasenbeseitigung die genannte vorgegebene Zeit ab, so kann man davon ausgehen, daß bis dahin etwaige Luft, die sich in tieferen Schichten der aufgebrachten Gießmasse befunden hat, bis zu deren Oberfläche aufgestiegen ist und dortige Luftblasen bildet. Diese oberflächennahen Luftblasen kann man mit Vorteil dadurch beseitigen, daß man darauf von außen Wärme einwirken läßt, z.B. mittels Warmluft, mittels offener Flamme od.dgl.. Dadurch wird die in den Luftblasen enthaltene Luft erwärmt. Sie dehnt sich aus. Die Ausdehnung hat ein Zerplatzen der Luftblasen mit Entweichen der Luft zur Folge. Das Randmaterial der Luftblasen fließt, da es noch dünnflüssig und leicht fließfähig ist, zurück und es ergibt sich selbsttätig auch in diesem Bereich eine durchgängige ebene Oberfläche 12.Another essential procedural measure in manufacturing is as follows. The formation of air bubbles is unavoidable when processing the described synthetic resin casting compounds. It can therefore be advantageous if after the application of the synthetic resin casting compound and after a predetermined time, e.g. about 30 minutes, air bubbles present on the surface of the casting compound are eliminated. If you wait for the specified time to remove the bubbles, you can assume that any air that was in the deeper layers of the applied casting compound has risen to the surface and forms air bubbles there. These air bubbles near the surface can advantageously be removed by allowing them to be exposed to heat from the outside, e.g. by means of warm air, by means of an open flame or the like. This heats the air contained in the air bubbles. It expands. The expansion causes the air bubbles to burst and the air to escape. The edge material of the air bubbles flows back, since it is still fluid and easy to flow, and it also automatically results in a continuous flat surface 12 in this area.

Die in beschriebener Weise hergestellte Druckauflageplatte 10 mit der aus Kunststoff bestehenden Schicht 11 hat vielfältige, zuvor bereits herausgestellte Vorteile. Dazu gehört auch der Vorteil, daß aufgrund des Materials, aus dem die Schicht 11 mit der Oberfläche 12 besteht, ein Zerkratzen empfindlicher, zu bedruckender Materialien, z.B. von Glasplatten, von Emailschildern od.dgl. durch die Oberfläche 12 der Schicht 11 vermieden ist. Die Schicht 11 ist schnell, einfach und kostengünstig bedarfsweise ausbesserbar und reparierbar. Dadurch kann eine Druckauflageplatte 10 nach Reparatur wieder verwendet werden, so daß also eine Neuanschaffung und die dadurch bedingten hohen Kosten, etwaiger Maschinenstillstand, Produktionsausfall etc. vermieden werden können. Auch vorhandene Druckauflageplatten bei vorhandenen Siebdruckmaschinen, bei denen die Druckoberfläche in anderer Weise gestaltet ist, können nach dem Verfahren gemäß der Erfindung repariert, ausgebessert oder mit einer neuen Schicht entsprechend der Schicht 11 mit planer Oberfläche 12 ausgestattet werden. Man kann also auch hier vorhandene Druckplatten weiterverwenden und muß keine Neuanschaffungen dieser oder gar der kompletten Siebdruckmaschine vornehmen. Die Druckauflageplatte 10 gemäß der Erfindung sowie das beschriebene Verfahren zu deren Herstellung macht es in einfacher, kostengünstiger Weise vor allem auch möglich, großformatige Druckauflageplatten 10 herzustellen und auch für diese zu garantieren, daß deren Oberfläche 12 über die gesamte Flächenerstreckung gleichmäßig und hochgradig eben ist, und dies ohne die Notwendigkeit einer etwaigen mechanischen Oberflächenbearbeitung, um zumindest zu versuchen, auf diese Weise eine entsprechende Güte zu erreichen. Wenn man bei der Herstellung die hochragenden Stützflächen durch einen Schalungsrahmen bildet, kann dieser so beschaffen sein, daß er immer wieder verwendbar ist.The printing platen 10 produced in the manner described with the layer 11 consisting of plastic has a variety of advantages which have already been highlighted. This also includes the advantage that, due to the material from which the layer 11 with the surface 12 consists, scratching of sensitive materials to be printed, for example glass plates, enamel signs or the like. is avoided by the surface 12 of the layer 11. Layer 11 can be repaired and repaired quickly, easily and inexpensively, if necessary. As a result, a printing platen 10 can be used again after repair, so that a new purchase and the resulting high costs, possible machine downtime, loss of production, etc. can be avoided. Existing printing platen in existing screen printing machines, in which the printing surface is designed in a different way, can also be repaired, repaired or equipped with a new layer corresponding to layer 11 with a flat surface 12 by the method according to the invention. You can continue to use existing printing plates here and do not have to make any new purchases of this or even the entire screen printing machine. The printing platen 10 according to the invention and the described method for its production make it possible in a simple, cost-effective manner above all to produce large-format printing platen 10 and also to guarantee that the surface 12 thereof is uniform and highly flat over the entire area, and this without the need for any mechanical surface treatment, at least to try to achieve an appropriate quality in this way. If one forms the form of a formwork frame during production, this can be made in such a way that it can be used again and again.

Claims (36)

  1. Method for the production of a flat printing support surface of large surface area for screen printing tables or the like, a material being applied to a support surface (13) and left to harden, characterised in that a thinly liquid synthetic resin casting material which flows easily is applied, which has low viscosity facilitating flowing and free running and that the liquid synthetic resin pouring material applied to the support surface (13) is if necessary distributed thereon and then runs freely and is distributed uniformly and automatically under the action of gravity its surface becomes flat and horizontal.
  2. Method according to Claim 1, characterised in that the liquid synthetic resin pouring material is distributed on the support surface (13).
  3. Method according to Claim 1 or 2, characterised in that the liquid synthetic resin pouring material is poured out onto the support surface (13).
  4. Method according to one of Claims 1 to 3, characterised in that upwardly projecting support faces (24, 25) -are formed along the edges of the support surface (13), which faces retain the liquid synthetic resin pouring material and prevent it from flowing away.
  5. Method according to one of Claims 1 to 4, characterised in that a layer thickness of at least 3 mm is produced with the liquid synthetic resin pouring material on the support surface (13).
  6. Method according to one of Claims 1 to 5, characterised in that a synthetic resin pouring material of this type is applied, that the layer (11) resulting after hardening is on the one hand sufficiently hard and on the other hand adequately flexible and compensates for expansions of the support surface material (13, 14).
  7. Method according to one of Claims 1 to 6, characterised in that before application the synthetic resin pouring material is coloured by introducing colouring agents.
  8. Method according to one of Claims 1 to 7, characterised in that one applies such a synthetic resin pouring material, whereof the hardened layer (11) is temperature-resistant up to 150°C.
  9. Method according to one of Claims 1 to 8, characterised in that a synthetic resin pouring material of this type is applied, whereof the hardened layer (11) is resistant to solvents.
  10. Method according to one of Claims 1 to 9, characterised in that a synthetic resin pouring material of this type is applied, whereof the hardened layer (11) is readily machineable.
  11. Method according to one of Claims 1 to 10, characterised in that after hardening of the synthetic resin pouring material, if necessary holes are introduced into the layer (11) formed and the support surface (13) located therebelow.
  12. Method according to one of Claims 1 to 11, characterised in that the liquid synthetic resin pouring material is applied to such a support surface (13) consisting of metal.
  13. Method according to one of Claims 1 to 11, characterised in that the liquid synthetic resin pouring material is applied to such a support surface (13) consisting of wood or sandwich material or synthetic material.
  14. Method according to one of Claims 1 to 13, characterised in that the support surface (13) is formed from a support plate (14) or from several support plates (14) permanently connected to each other, each support plate (14) being resistant to bending.
  15. Method according to one of Claims 1 to 14, characterised in that an epoxy resin is applied as the liquid synthetic resin pouring material.
  16. Method according to one of Claims 1 to 15, characterised in that the synthetic resin pouring material applied is left to harden for up to 7 days.
  17. Method according to one of Claims 1 to 16, characterised in that the synthetic resin pouring material applied is left to harden free from vibration.
  18. Method according to one of Claims I to 17, characterised in that after the application of the synthetic resin pouring material and after a predetermined time, which may be of the order of 30 minutes, air bubbles present on the surface are removed.
  19. Method according to Claim 18, characterised in that the air bubbles are removed due to the fact that heat is allowed to act thereon from outside.
  20. Method according to Claim 18 or 19, characterised in that the upper side of the synthetic resin pouring material applied is treated with warm air or an open flame.
  21. Method according to one of Claims 4 to 20, characterised in that the upwardly projecting support faces are removed after 3 to 4 days of the hardening time of the synthetic resin pouring material.
  22. Method according to one of Claims 4 to 20, characterised in that the upwardly projecting support faces (24, 25) are constructed as an edge closure and are left as a remaining edge after hardening of the synthetic resin pouring material.
  23. Method according to one of Claims 4 to 22, characterised in that the upwardly projecting support faces (24, 25) are formed by edge strips (21) or self-adhesive strips.
  24. Printing support plate, produced by the method according to one or more of Claims 1 to 23, characterised by a layer (11) adhering uniformly to a support surface (13) and consisting of a synthetic resin pouring material which is applied and hardened, the surface (12) of which layer (11) is constructed to be uniformly flat to a high degree.
  25. Printing support plate according to Claim 24, characterised in that in the region of damaged points the surface (12) can be repaired and levelled by applying the liquid synthetic resin pouring material and by hardening thereof.
  26. Printing support plate according to Claim 24 or 25, characterised in that the layer (11) is temperature resistant up to 150°C and/or resistant to solvents and/or easily machineable.
  27. Printing support plate according to one of Claims 24 to 26, characterised in that the thickness of the layer (11) amounts to at least 3 mm.
  28. Printing support plate according to one of Claims 24 to 27, characterised in that the layer (11) is on the one hand sufficiently hard and on the other hand adequately flexible and compensates for expansions of the support surface material (13, 14).
  29. Printing support plate according to one of Claims 24 to 28, characterised in that the layer (11) is coloured.
  30. Printing support plate according to one of Claims 24 to 29, characterised in that the layer (11) is applied to a support plate (14) or to several support plates (14) consisting of metal or wood or sandwich material or synthetic material, connected to each other as a unit and is retained permanently thereon.
  31. Printing support plate according to one of Claims 24 to 30, characterised in that the layer (11) consists of epoxy resin.
  32. Printing support plate according to one of Claims 24 to 31, characterised by an edge closure (20) remaining around the edge.
  33. Printing support plate according to Claim 32, characterised in that the edge closure (20) overlaps the layer (11) in the edge region and finishes flush with its surface (12).
  34. Printing support plate according to Claim 32 or 33, characterised in that the edge closure (20) is formed by means of angle profiles (21).
  35. Printing support plate according to one of Claims 24 to 34, characterised by a plate format of 2000 x 4000 mm or larger.
  36. Printing support plate according to one of Claims 24 to 35, characterised by the construction as a vacuum printing plate, which contains a plurality of holes.
EP91109644A 1990-07-25 1991-06-12 Method for manufacturing a plane and in particular a large surfaced support for printing Expired - Lifetime EP0468184B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4023566A DE4023566C1 (en) 1990-07-25 1990-07-25
DE4023566 1990-07-25

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EP0468184A1 EP0468184A1 (en) 1992-01-29
EP0468184B1 true EP0468184B1 (en) 1994-05-18

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EP91109644A Expired - Lifetime EP0468184B1 (en) 1990-07-25 1991-06-12 Method for manufacturing a plane and in particular a large surfaced support for printing

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US (1) US5234743A (en)
EP (1) EP0468184B1 (en)
AT (1) ATE105777T1 (en)
DE (1) DE4023566C1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6113199A (en) * 1997-11-20 2000-09-05 Kewaunee Scientific Corporation Laboratory countertop
US6290202B1 (en) 1997-11-20 2001-09-18 Kewaunee Scientific Corporation Apparatus for molding thin resin sheets
DE102011012870A1 (en) 2011-03-02 2012-09-06 EMMTEC, EMM Siebdruckmaschinen Printing plate for e.g. screen printing table, has base plate, honeycomb structure plate and porous, highly planar support plate, which are stacked in order and adhered together

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2302198A1 (en) * 1975-02-26 1976-09-24 Michel Alain Screen printing heating table - has insulated heater unit with elements embedded in flat top surface
JPS5695902A (en) * 1979-12-29 1981-08-03 Toyobo Co Ltd Uv-curable resin composition
EP0094142B1 (en) * 1982-03-15 1986-09-03 Crosfield Electronics Limited Printing member and method for its production
JPS58182636A (en) * 1982-04-20 1983-10-25 Fuji Photo Film Co Ltd Photosensitive printing plate
US4859571A (en) * 1986-12-30 1989-08-22 E. I. Du Pont De Nemours And Company Embedded catalyst receptors for metallization of dielectrics
DE3823853A1 (en) * 1988-07-14 1990-01-18 Johann Sprinz Gmbh & Co Kg Screen printing table

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US5234743A (en) 1993-08-10
ATE105777T1 (en) 1994-06-15
EP0468184A1 (en) 1992-01-29
DE4023566C1 (en) 1991-09-19

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