EP0785871B1 - Procede de serigraphie - Google Patents

Procede de serigraphie Download PDF

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Publication number
EP0785871B1
EP0785871B1 EP95934603A EP95934603A EP0785871B1 EP 0785871 B1 EP0785871 B1 EP 0785871B1 EP 95934603 A EP95934603 A EP 95934603A EP 95934603 A EP95934603 A EP 95934603A EP 0785871 B1 EP0785871 B1 EP 0785871B1
Authority
EP
European Patent Office
Prior art keywords
printing
edge
plastic
printing screen
part made
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
EP95934603A
Other languages
German (de)
English (en)
Other versions
EP0785871A1 (fr
Inventor
Rudolf August KÜRTEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RK Siebdrucktechnik GmbH
Original Assignee
RK Siebdrucktechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19512696A external-priority patent/DE19512696C2/de
Application filed by RK Siebdrucktechnik GmbH filed Critical RK Siebdrucktechnik GmbH
Publication of EP0785871A1 publication Critical patent/EP0785871A1/fr
Application granted granted Critical
Publication of EP0785871B1 publication Critical patent/EP0785871B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/44—Squeegees or doctors

Definitions

  • the invention relates to a screen printing method using a slidably guided, strip-shaped doctor blade with a Squeegee edge and one arranged at a distance from the printing medium Printing screen, which is actuated by the squeegee against the printing medium is movable.
  • the invention relates to a doctor blade for implementation the screen printing process.
  • a printing stencil serving small-mesh printing screen used is arranged above the print carrier and on its top carries the pressure medium. Movable with the help of a guided, strip-shaped doctor blade, the printing screen against the Pressure carrier brought to the plant, with the pressure medium in this Area passes through the mesh and in the event of a shift the squeegee or the print carrier is a flat print he follows.
  • Screen printing can use machines with a rotating cylindrical Print material support or one with a flat one Printed material support are used, with the latter from Flatbed printing speaks.
  • Printing screens are usually made of a textile material like polyester threads, but it can also use natural fabrics such as silk.
  • metal pressure screens such pressure screens So far, preferably used for textile printing, where, however, the metal mesh directly on the print carrier lies on. While in the latter process metallic, d. H. dimensionally stable squeegees are known, this has been used so far Screen printing process in which the print carrier is at a distance from the Pressure screen is not used because it was assumed that the squeegee seals when moving on the printing screen had to rest and also metallic squeegees would destroy sensitive textile sieves in a short time.
  • the squeegee strip When screen printing with such soft elastic doctor blades the squeegee strip is guided at an angle to the printing screen and is being applied a certain pressure over the pressure screen.
  • the squeegee deforms in the area of the squeegee or Print edge due to its soft elastic properties.
  • the angle between the squeegee and the printing screen depends on a variety of different parameters, which over the Deformation of the squeegee edge has a significant impact on that Print result and the printing agent consumption.
  • Such Parameters are, for example, the vertical applied Pressure, the speed at which the squeegee moves, the surface finish the printing cylinder or the printing bed, the physico-chemical properties of the printing medium as well as the respective state of aging or degree of wear of the used soft elastic doctor blade material.
  • the invention is therefore based on the object of a generic Screen printing process or one for this screen printing process squeegee to be used, in which the printing result is improved, the pressure medium consumption is reduced and the service life of the squeegee can be increased.
  • This object is achieved in that the Doctor blade at least in the area of the doctor blade edge from a dimensionally stable Material such as B. metal or a hard elastic There is plastic and that this squeegee edge is linear Pad is placed on the printing screen.
  • a dimensionally stable Material such as B. metal or a hard elastic
  • the doctor blade used to perform this screen printing process is characterized in that the squeegee edge from a with regard to the pressure loads customary in the screen printing process dimensionally stable material.
  • doctor blade advantageously consists of an extruded one Plastic, the plastic having such a hardness, that the extrusion can be carried out in a precise shape and dimension.
  • doctor blades can be produced that are conventional Plastic squeegees that are cast or spun be manufactured, a significantly higher homogeneity both within a squeegee as well as between different ones Have batches. The homogeneity that can now be achieved for the first time the squeegee is a decisive factor for a uniform and reproducible Printing result.
  • the extruded according to the invention Squeegee points with the selected hardness of the plastic moreover at the same time a very evenly shaped and dimensionally stable squeegee edge, by means of which due to the exact Shaping an adequate and even seal of the hard elastic squeegee edge achievable compared to the printing screen is.
  • the minimum hardness of the squeegee edge is 80 Shore A.
  • the doctor blade materials used up to now have hardnesses of approx. 50 to about 70 Shore A used.
  • the doctor blade according to the invention can, for example, also consist of a comparatively thin spring steel strips exist, the lower Edge through longitudinally running of the doctor strip curved and / or straight surfaces is limited. This Surfaces and thus the geometric formation of the printing edge the squeegee can be achieved by targeted mechanical processing become. It has proven advantageous if the Squeegee edge is limited by curved or straight surfaces, the at least partially to the transverse extent of the doctor strip are inclined.
  • the optimal inclination of the squeegee edge to the transverse extent to be set the squeegee depends essentially on the used Printing media, the printing speed and the from each printing screen, due to the dimensionally stable squeegee edge the conditions at the squeegee edge are complete in each case are reproducible.
  • doctor edge or the surfaces delimiting the doctor edge are preferably smoothed or polished, so that an impermissible high mechanical load on the pressure screen due to the hard squeegee edge is avoided.
  • Doctor blades can also be used on particularly sensitive printing screens are used, the squeegee edge wholly or partly with are coated with a thin plastic or rubber covering acts as a lubricant.
  • the doctor blade according to the invention can be relative be thin. Its thickness is preferably in the area of the doctor edge between 0.01 and 2 mm.
  • FIG. 1 to 4 is a selection from a variety of possible configurations of the squeegee edge from a dimensionally stable Material such as B. spring steel shown, each suitable for different printing media or printing machines are.
  • the individual doctor blade shapes are shown in tears and, if necessary with the insertion of intermediate strips, used in the usual squeegee holders.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Printing Methods (AREA)
  • Non-Metallic Protective Coatings For Printed Circuits (AREA)
  • Production Of Multi-Layered Print Wiring Board (AREA)
  • Rotary Presses (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (8)

  1. Application d'une pièce moulée en matière plastique en forme de bande qui comporte une arête linéaire et qui est constituée du moins dans la zone de l'arête en une matière plastique extrudée et à forme stable, en tant que raclette pour des procédés de sérigraphie, l'arête linéaire pouvant être appliquée contre une toile de sérigraphie.
  2. Application dune pièce moulée en matière plastique selon la revendication 1, dont l'arête susceptible d'être appliquée contre la toile présente une dureté minimum de 80 Shore A.
  3. Application d'une pièce moulée en matière plastique selon l'une ou l'autre des revendications 1 et 2, dont l'arête susceptible d'être appliquée sur la toile est limitée, au niveau de l'appui contre la toile, par des surfaces incurvées et/ou rectilignes s'étendant en direction longitudinale.
  4. Application d'une pièce moulée en matière plastique selon l'une quelconque des revendications 1 à 3, dont l'arête susceptible d'être appliquée contre la toile est limitée par des surfaces qui sont réalisées du moins en partie en inclinaison par rapport à l'extension transversale de la pièce moulée en matière plastique.
  5. Application d'une pièce moulée en matière plastique selon l'une quelconque des revendications 1 à 4, dont l'arête susceptible d'être appliquée contre la toile est revêtue du moins en partie d'un revêtement en matière plastique ou en caoutchouc faisant office de moyen antifriction.
  6. Application d'une pièce moulée en matière plastique selon l'une quelconque des revendications 1 à 5, dont l'épaisseur dans la zone de l'arête susceptible d'être appliquée contre la toile est de l'ordre de 0,01 à 2 mm.
  7. Application d'une pièce moulée en matière plastique selon l'une quelconque des revendications 1 à 6, conjointement avec une toile qui est agencée à distance d'un porte-plaque et qui est déplaçable contre le porte-plaque par actionnement de la pièce moulée en matière plastique.
  8. Application d'une pièce moulée en matière plastique selon la revendication 7, en utilisant une toile en matière textile.
EP95934603A 1994-10-14 1995-10-13 Procede de serigraphie Expired - Lifetime EP0785871B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4436650 1994-10-14
DE4436650 1994-10-14
DE19512696 1995-04-07
DE19512696A DE19512696C2 (de) 1994-10-14 1995-04-07 Rakel, insbesondere für den Siebdruck
PCT/DE1995/001428 WO1996011807A1 (fr) 1994-10-14 1995-10-13 Procede de serigraphie

Publications (2)

Publication Number Publication Date
EP0785871A1 EP0785871A1 (fr) 1997-07-30
EP0785871B1 true EP0785871B1 (fr) 1999-05-19

Family

ID=25941024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95934603A Expired - Lifetime EP0785871B1 (fr) 1994-10-14 1995-10-13 Procede de serigraphie

Country Status (5)

Country Link
EP (1) EP0785871B1 (fr)
AT (1) ATE180211T1 (fr)
DK (1) DK0785871T3 (fr)
ES (1) ES2134499T3 (fr)
WO (1) WO1996011807A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1033986A (en) * 1963-10-28 1966-06-22 Argon Service Ltd Screen printing machines
AT296927B (de) * 1967-01-31 1972-03-10 Peter Zimmer Vorrichtung zum Auftragen von flüssigen oder pastösen Massen
DE8805911U1 (de) * 1988-05-04 1989-08-31 Acla-Werke GmbH, 5000 Köln Rakel für die Siebdrucktechnik

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
F. Johannhaber, Kunstoff Maschinen Führer, Hanser Verlag, 1992, München, Seiten 327-329 *

Also Published As

Publication number Publication date
WO1996011807A1 (fr) 1996-04-25
DK0785871T3 (da) 1999-11-29
ES2134499T3 (es) 1999-10-01
EP0785871A1 (fr) 1997-07-30
ATE180211T1 (de) 1999-06-15

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