EP0468184B1 - Verfahren zur Herstellung einer ebenen und insbesondere grossflächigen Druckauflagefläche - Google Patents

Verfahren zur Herstellung einer ebenen und insbesondere grossflächigen Druckauflagefläche 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
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0468184A1 (de
Inventor
Rudolf Fleischle
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0468184A1 publication Critical patent/EP0468184A1/de
Application granted granted Critical
Publication of EP0468184B1 publication Critical patent/EP0468184B1/de
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
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/16—Printing tables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/269—Web 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31511—Of 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)
EP91109644A 1990-07-25 1991-06-12 Verfahren zur Herstellung einer ebenen und insbesondere grossflächigen Druckauflagefläche Expired - Lifetime EP0468184B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

Publication Number Publication Date
EP0468184A1 EP0468184A1 (de) 1992-01-29
EP0468184B1 true EP0468184B1 (de) 1994-05-18

Family

ID=6410954

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91109644A Expired - Lifetime EP0468184B1 (de) 1990-07-25 1991-06-12 Verfahren zur Herstellung einer ebenen und insbesondere grossflächigen Druckauflagefläche

Country Status (4)

Country Link
US (1) US5234743A (enrdf_load_stackoverflow)
EP (1) EP0468184B1 (enrdf_load_stackoverflow)
AT (1) ATE105777T1 (enrdf_load_stackoverflow)
DE (1) DE4023566C1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6290202B1 (en) 1997-11-20 2001-09-18 Kewaunee Scientific Corporation Apparatus for molding thin resin sheets
US6113199A (en) * 1997-11-20 2000-09-05 Kewaunee Scientific Corporation Laboratory countertop
DE102011012870A1 (de) 2011-03-02 2012-09-06 EMMTEC, EMM Siebdruckmaschinen Vakuumdruckplatte/Druckauflageplatte sowie Verfahren zur Herstellung einer solchen Vakuumdruckplatte/Druckauflageplatte

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2302198A1 (fr) * 1975-02-26 1976-09-24 Michel Alain Table chauffante pour impression au cadre et procede de fabrication
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 (ja) * 1982-04-20 1983-10-25 Fuji Photo Film Co Ltd 感光性印刷版
US4859571A (en) * 1986-12-30 1989-08-22 E. I. Du Pont De Nemours And Company Embedded catalyst receptors for metallization of dielectrics
DE3823853A1 (de) * 1988-07-14 1990-01-18 Johann Sprinz Gmbh & Co Kg Siebdrucktisch

Also Published As

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

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