EP0785871A1 - Procede de serigraphie - Google Patents

Procede de serigraphie

Info

Publication number
EP0785871A1
EP0785871A1 EP95934603A EP95934603A EP0785871A1 EP 0785871 A1 EP0785871 A1 EP 0785871A1 EP 95934603 A EP95934603 A EP 95934603A EP 95934603 A EP95934603 A EP 95934603A EP 0785871 A1 EP0785871 A1 EP 0785871A1
Authority
EP
European Patent Office
Prior art keywords
squeegee
edge
printing
screen
doctor blade
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.)
Granted
Application number
EP95934603A
Other languages
German (de)
English (en)
Other versions
EP0785871B1 (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

Links

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 displaceably guided, strip-shaped doctor with a doctor edge and a printing screen arranged at a distance from the printing medium, which can be moved against the printing medium by actuating the doctor.
  • the invention also relates to a doctor blade for carrying out the screen printing process.
  • a small-mesh printing screen serving as a printing template is used, which is arranged above the printing medium and carries the printing medium on its upper side.
  • the printing screen is brought into contact with the printing medium, with the printing medium passing through the screen mesh in this area and a flat pressure being produced when the doctor blade or the printing medium is displaced.
  • the printing screens used in the production of graphic prints usually consist of a textile material such as polyester threads, but natural fabrics such as silk can also be used.
  • metal pressure screens is also conceivable, such pressure screens So far, preferably used in textile printing, but in which the metal fabric rests directly on the print carrier.
  • metallic, ie dimensionally stable, doctor blades are already known in the latter method, this has not hitherto been used in screen printing methods in which the printing medium is arranged at a distance from the printing screen, since it was assumed that the doctor blade would seal on the print when moving sieve had to rest on top of it, and metallic squeegees would destroy the delicate textile sieves in a short time.
  • the doctor blade strip When screen printing with such flexible elastic doctor blades, the doctor blade strip is guided at an angle to the printing screen and is drawn over the printing screen while applying a certain pressure.
  • the squeegee deforms in the area of the squeegee or printing edge due to its soft elastic properties.
  • the degree of deformation and thus also the ultimately established angle between the doctor blade and the printing screen depends on a large number of different parameters which, via the deformation of the doctor blade edge, have a considerable influence on the printing result and the printing agent consumption.
  • Such parameters are, for example, the applied vertical pressure, the displacement speed of the printing doctor, the surface quality of the printing cylinder or the printing bed, the physico-chemical properties of the printing medium and the respective state of aging or degree of wear of the soft-elastic doctor material used.
  • the invention is therefore based on the object of providing a generic screen printing method or a doctor blade to be used for this screen printing method, in which the printing result is improved, the pressure medium consumption is reduced and the service life of the doctor blade can be increased.
  • doctor blade at least in the area of the doctor blade edge of a dimensionally stable material such as. B. metal or a hard elastic plastic and that this doctor edge is brought to the linear support on the printing screen.
  • the doctor blade used to carry out this screen printing process is characterized in that the squeegee edge consists of a material which is dimensionally stable with regard to the printing loads customary in the screen printing process.
  • the squeegee advantageously consists of an extruded 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 which, compared to conventional plastic doctor blades, which are manufactured by casting or spinning, have a significantly higher homogeneity both within a doctor blade and between different batches.
  • the homogeneity of the doctor blade which can now be achieved for the first time, is a decisive factor in achieving a uniform and reproducible printing result.
  • the squeegee extruded according to the invention also has a very uniformly shaped and dimensionally stable squeegee edge, with the hardness of the plastic chosen accordingly, by means of which an exact and uniform sealing of the hard-elastic squeegee edge against the printing screen can be achieved due to the exact shape.
  • the minimum hardness of the doctor edge is 80 Shore A. With the doctor blade materials used so far, hardnesses of about 50 to about 70 Shore A were used.
  • the doctor blade according to the invention can also consist, for example, of a comparatively thin spring steel strip, the lower edge of which is delimited by curved, and / or straight surfaces extending in the longitudinal direction of the doctor blade strip. These surfaces and thus the geometrical configuration of the printing edge of the doctor blade can be achieved by targeted mechanical processing. It has proven to be advantageous if the doctor edge is delimited by curved or straight surfaces which are at least partially inclined to the transverse extent of the doctor strip.
  • the optimal inclination of the squeegee edge to the transverse extension of the squeegee essentially depends on the printing means used, the printing speed and the respective printing screen, the conditions on the squeegee edge being completely reproducible due to the dimensionally stable squeegee edge .
  • the squeegee edge or the surfaces delimiting the squeegee edge are preferably smoothed or polished, so that an inadmissibly high mechanical load on the printing screen due to the hard squeegee edge is avoided.
  • doctor blades can also be used, the doctor blade edge of which is completely or partially coated with a thin plastic or rubber coating which acts as a lubricant.
  • the doctor blade according to the invention can be relatively thin. Their thickness in the area of the doctor edge is preferably between 0.01 and 2 mm.
  • hard-elastic plastics for example, those are selected which are insensitive to the printing agents or their solvents.
  • the new types of doctor blades have a service life that is ten orders of magnitude higher than the conventional soft-elastic doctor blades, so that the corresponding available printing times can now be used almost 100 percent.
  • FIGS. 1 to 4 show a selection from a large number of possible designs of the doctor edge made of a dimensionally stable material such as B. spring steel is shown, which are each suitable for different compression means or printing presses.
  • the individual squeegee shapes are shown in tears and are inserted into the usual squeegee holders, if necessary with intermediate strips.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Rotary Presses (AREA)
  • Printing Methods (AREA)
  • Non-Metallic Protective Coatings For Printed Circuits (AREA)
  • Production Of Multi-Layered Print Wiring Board (AREA)
  • Treatment Of Fiber Materials (AREA)
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 true EP0785871A1 (fr) 1997-07-30
EP0785871B1 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
See references of WO9611807A1 *

Also Published As

Publication number Publication date
DK0785871T3 (da) 1999-11-29
ES2134499T3 (es) 1999-10-01
WO1996011807A1 (fr) 1996-04-25
ATE180211T1 (de) 1999-06-15
EP0785871B1 (fr) 1999-05-19

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