EP0802049A1 - Procédé d'impression demi-tons et machine d'impression pour sa réalisation - Google Patents

Procédé d'impression demi-tons et machine d'impression pour sa réalisation Download PDF

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Publication number
EP0802049A1
EP0802049A1 EP96106202A EP96106202A EP0802049A1 EP 0802049 A1 EP0802049 A1 EP 0802049A1 EP 96106202 A EP96106202 A EP 96106202A EP 96106202 A EP96106202 A EP 96106202A EP 0802049 A1 EP0802049 A1 EP 0802049A1
Authority
EP
European Patent Office
Prior art keywords
printing
halftone
stencil
rotary
optical data
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
EP96106202A
Other languages
German (de)
English (en)
Other versions
EP0802049B1 (fr
Inventor
Heinz Mungenast
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.)
Schablonentechnik Kufstein GmbH
Original Assignee
Schablonentechnik Kufstein 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 to EP96106202A priority Critical patent/EP0802049B1/fr
Application filed by Schablonentechnik Kufstein GmbH filed Critical Schablonentechnik Kufstein GmbH
Priority to DE59601451T priority patent/DE59601451D1/de
Priority to AT96106202T priority patent/ATE177684T1/de
Priority to ES96106202T priority patent/ES2129907T3/es
Priority to US08/833,450 priority patent/US5907996A/en
Priority to JP9093966A priority patent/JP3046780B2/ja
Priority to CN97104202A priority patent/CN1078133C/zh
Publication of EP0802049A1 publication Critical patent/EP0802049A1/fr
Application granted granted Critical
Publication of EP0802049B1 publication Critical patent/EP0802049B1/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
    • B41F15/08—Machines
    • B41F15/0831—Machines for printing webs
    • B41F15/0836—Machines for printing webs by means of cylindrical screens or screens in the form of endless belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2233/00—Arrangements for the operation of printing presses
    • B41P2233/10—Starting-up the machine

Definitions

  • the invention relates to a halftone printing method according to the type mentioned in claim 1 and a rotary stencil printing machine according to claim 7.
  • Stencils for textile printing which apply different amounts of color per unit area (halftone printing) depending on the area and due to the pattern to be produced, are generally known.
  • These stencils can be flat stencils or rotary printing stencils.
  • These stencils can be screen printing stencils, flexographic printing stencils, gravure printing stencils etc. Common to all is that they have uniform stencil opening structures in different stencil areas, which however differ from area to area.
  • the screen openings of a screen coated with masking varnish are covered or exposed to different degrees in different template areas in order to obtain different degrees of permeability in the respective areas.
  • the sieve could also be made from the outset in such a way that it has different sieve openings in different areas. The latter also applies to the above-mentioned flexographic printing stencils or gravure printing stencils, which, however, have no through openings.
  • stencil opening structure here refers to the depressions present in the surface of the stencils mentioned.
  • a rotary screen printing stencil is explained in more detail as an example.
  • a coated and thus closed, hollow cylindrical circular screen can be used and z.
  • a laser beam is scanned for the surface of the sieve or the hollow cylinder, for example after closely adjacent screw lines, and the laser beam is pulsed.
  • the lacquer is removed from the sieve cylinder in the form of small openings, and an irregularly perforated lacquer structure is then superimposed on the uniformly perforated sieve.
  • the template created in this way can be used directly for printing.
  • a lacquer structure or stencil opening structure consisting of many small and separate points is produced by the above-mentioned processing by means of the laser beam.
  • the different permeability of the stencil areas results from the switch-on or switch-off times of the engraving laser beam being of different lengths.
  • Stencils of the type mentioned above can also be produced by spraying a liquid onto the stencil base cylinder.
  • the different permeability of the stencil areas is caused by differently long switch-on or switch-off times of a spray nozzle used.
  • this would allow a uniformly perforated screen to be coated in a corresponding manner with masking lacquer in order to directly obtain different areas, each with a different degree of permeability.
  • the covering lacquer layer which is sprayed onto the closed surface of a carrier body for the galvanic production of a corresponding screen.
  • an opaque liquid could first be sprayed onto a polymerizable cover layer, after which a large-area exposure takes place. A development process would then take place after the uncovered layer regions had hardened.
  • the invention is based on the object of specifying a halftone printing method with which halftone prints can be carried out more smoothly and true to color.
  • the template opening structures can be those in which already existing screen openings are covered to a greater or lesser extent by a lacquer layer to be placed thereon.
  • the template opening structures can also be directly screen openings, each of which has different sizes in the areas mentioned.
  • stencil opening structures are also to be understood as those recesses or depressions which are located in the surface of a gravure or flexographic printing form.
  • the aforementioned comparison of the optical data of the respective print images with the corresponding target values can, for. B. done visually by the printer. It can be done very simply by creating a comparison pattern that has the correct optical data. For this comparison, however, the printing press has to be stopped.
  • the color values and / or the color intensities are preferably used as optical data. They are very easy to grasp and assess visually.
  • printed images can also be measured electronically, and the comparison of the optical data with the corresponding target values and the adjustment of the printing parameters can also be carried out automatically. This enables uninterrupted operation of the printing press and thus faster printing start-up.
  • the areas mentioned come to lie outside the actual pattern area of the halftone printing stencil, so that the corresponding print images which are assigned to these areas are printed outside the actual halftone pattern.
  • area marks The areas mentioned outside the actual pattern area of the halftone printing stencil are to be referred to below as area marks. In each of these area marks there are uniform stencil opening structures, which, however, differ from area mark to area mark.
  • the print images obtained on the web using the area marks are referred to below as area mark images.
  • the surface marks can lie directly on one another or can be arranged separately or at a distance from one another.
  • cylindrical stencils can of course also be used as halftone printing stencils.
  • the printing parameters of an inking unit include the contact pressure of the doctor blade or, in the case of doctor blades, the curvature of the coating lip, the printing speed, the doctor blade diameter, the ink sump height and the ink viscosity.
  • their shape more precisely the curvature of the doctor blade lip, can be changed by pressing the doctor blade down more or less on the end faces of the stencil.
  • the pressure on the squeegee can be changed by increasing or weakening the magnetic field.
  • the diameter of a doctor blade i.e. its shape, can only be changed by replacing the doctor blade itself.
  • the change in the viscosity of the color paste is generally the most cumbersome, since this usually requires a complete cleaning of the printing station.
  • a test halftone print is first made by a series of test prints with engravings that have different permeability. This is then measured, i.e. that is, the intensity of the color application is determined and the position of the color value in a color system suitable for color determination is determined.
  • color systems are known and z. B. standardized under DIN 5033 and DIN 6164.
  • This test print is expediently carried out on a printing press, which is either the later production machine from the outset or at least corresponds in design.
  • the type of engraving of the test templates will also correspond to the type of engraving of the envisaged production templates.
  • test prints will be made in such a way that the previously mentioned setting parameters of the printing machine are gradually varied within predetermined limits.
  • tabular assignments of color intensities to engraving opening ratios are obtained.
  • Each table also includes certain values of the setting parameters specified above.
  • the measuring device In the event that there are no surface marks on the edge of the stencil and regions of the actual stencil pattern are to serve as a replacement for these surface marks, the measuring device must be arranged so that it can be moved on the printing machine in order to be able to measure the printed images printed with these regions. Your route can then be set under computer control.
  • Fig. 1 shows a halftone rotary printing stencil 1, which is equipped in its central part 2 with a pattern engraving 3, which has different permeability ratios in different areas.
  • a pattern engraving 3 which has different permeability ratios in different areas.
  • At the front edge of the halftone rotary printing stencil 1 there are a plurality of surface marks 4, here separated, each of which has a uniform permeability, but the permeabilities differ from surface mark 4 to surface mark 4.
  • the permeability of the area marks 4 but not exactly the same permeability that occurs in the pattern engraving 3.
  • the area marks 4 are nothing more than predetermined engraving areas in which there are stencil openings with a size that are smaller in comparison to a standard size. Is the halftone rotary printing stencil 1 z. B.
  • a printing mark 5 (pico) is also provided, which is realized here by a circular ring and which is used to make it easier to produce a precisely fitting print of the stencils 1 arranged one behind the other on a printing press.
  • This print mark 5 also lies on the front edge of the halftone rotary printing stencil 1 outside the pattern engraving 3.
  • a comparison standard can be stopped on the printed area marks 4 for the purpose of visual assessment of the engraving.
  • B. consists of printed fabric with correct tonal values. In such a visual comparison, the press must of course be stopped. If it turns out that the printed area marks 4, that is to say the respective printed images of the area marks 4 deviate from the respective comparison standard, then print parameters are adjusted accordingly such that the next time the printed area marks are better in accordance with the respective comparison standards.
  • FIG. 2 shows a rotary stencil printing machine 6, on which several stencils 1 equipped according to FIG. 1 are used.
  • the stencils 1 are driven via gearwheels 7 and repeat gear 8, so that they run synchronously with the web 9 or the printing blanket 10 guided under the stencils 1 by the machine 6.
  • the gears 7 are attached to template heads which are glued into the end face of the templates 1.
  • the web 9 is glued to the printing blanket 10 with a very easily removable adhesive and this is therefore held in place by the printing blanket 10 during printing.
  • the printing blanket 10 is a very wide rubber fabric conveyor belt with a very smooth surface and with one if possible uniform bending behavior across the width. This printing blanket 10 runs over two deflecting rollers 11 and 15, which are wrapped around by the printing blanket 10.
  • the rear deflection roller 15 is driven by a DC motor 16. This deflecting roller pulls the printing blanket 10 under the stencils 1.
  • the front deflecting roller 11 is driven by the printing blanket 10.
  • the deflecting roller 11 drives the individual repeat gear 8 via a bevel gear mechanism hidden by the side wall 14 of this FIG. 2 and a countershaft which is also covered. With this arrangement, the aforementioned synchronous operation between stencils 1 and web 9 to be printed is achieved.
  • the area marks 4 of each stencil 1 are printed together with the pattern on the web 9 and there result in area mark images 12.
  • a video camera 13 is mounted on the side wall 14 at the end of the printing machine 6 and continuously measures the color values and intensities of the area mark images 12.
  • the images taken Video images are sent to a computer 17 via a data line 18.
  • a controller 20 is adjusted via the signal line 19, which influences the speed of the DC motor 16, or a servomechanism is influenced via the signal line 21, which affects the position or the pressure one of the squeegees mounted in the templates 1 changed.
  • FIG. 3 A single inking unit of the rotary stencil printing machine 6 is shown in FIG. 3.
  • the template 1 is equipped with surface marks 4.
  • Small rollers 22 support the template 1 in its ends so that the template 1 cannot change its position relative to the machine 6.
  • These rollers 22 are mounted in roller blocks 23, which are adjusted along slide guides 24 and can thus be adjusted to different template diameters.
  • gear wheels 25 are attached to the template 1 and connected to it in a rotationally fixed manner.
  • gearboxes are accommodated on both sides of the machine. Of these gears, however, only the gear 26 meshing with the template 1 can be seen.
  • the countershafts 27 run in the longitudinal direction of the machine 6, more precisely in the transport direction of the printing blanket 10 and the web 9, and above the right side wall 14 there is a servomechanism 28 for pivoting a doctor blade 29 provided in the template 1 Doctor blade 29 is servomechanically adjustable in the vertical direction.
  • the height adjustment of the doctor blade 29 is carried out by means of a double rocker 32. which is rotatably held at its left end in a fixed bearing block 33 and whose right end can be raised or lowered by the servomechanism 34.
  • the servomechanism 28 engages the projecting end of a single rocker 35. If this end is raised or lowered by the servomechanism 28, then the doctor blade 29 rotatably mounted in the double rocker arm 32 is pivoted.
  • the thin, deformable doctor blade 36 is fastened to the doctor blade 29. If the doctor blade 29 is lowered, then the curvature of the doctor blade 36 and especially the wedge angle, which the end of the doctor blade 36 includes with the template 1, changes.
  • the outer diameter of the template 1 corresponds to the pitch circle diameter of the gear 25, which is plugged onto the template 1 and meshes with the gear 26 of the repeat gear.
  • FIG. 5 shows the cross section of a rotary stencil printing station, in which a roller doctor 36 presses inside the stencil 1 by means of electromagnets 38 against the inner wall of the stencil 1, which in turn is pressed against the web 9 and the printing blanket 10.
  • the printing blanket 10 runs above a printing table 37.
  • the ends of the cores 39 of the electromagnets 38 open into a groove 41 of the printing table 37 so that they do not line up unevenly against the printing blanket 10 from below when heated and the expansion caused thereby and cause streaky color loss; heating by the winding body 40 cannot be avoided with this type of construction.
  • the winding body 40 is connected via the leads 47 to a voltage-variable direct current source 48.
  • In front of the doctor roller 36 there is ink in the form of a sump 42.
  • Liquid ink from the sump 42 is in the conical gap between the doctor roller from the moving wall of the stencil 1 and also from the wall of the generally also rotating doctor roller 36 36 and template 1 are drawn in and pressed through the pattern-related openings of template 1 into the web 9.
  • the magnets 38 arranged in the longitudinal direction of the template 1 are alternately poled and connected at their lower ends by a magnetic yoke 43.
  • the hollow support 44 serves to stiffen the printing table 37 statically. This and the printing table 37 are made of a magnetically non-conductive material, such as aluminum.
  • the roller squeegee 36 is held in position by a stop bar 45, the liquid pressure generated in the ink sump 42 and the magnetic forces. This position can be changed slightly by pivoting the mounting tube 46.
  • the magnetic forces in this arrangement determine the force with which the doctor blade 36 is pulled against the wall of the template 1.
  • the slip of the doctor roller 36 with respect to this wall is then also adjusted by this magnetic force.
  • the gap height at the narrowest point between squeegee 36 and stencil wall is strongly influenced by this force, and the height of the hydrodynamically built-up pressure is thus determined.
  • the compression of the web 9 is also influenced and thus the flow resistance, which the web 9 opposes the penetration of the dye.
  • the various influencing factors work together in a very complex way, just like with doctor blade printing, but it can always be done by changing the magnetic pressure of a doctor blade or the curvature of a doctor blade, the position of the doctor roller or doctor blade and the printing speed, the amount of the dye, which from the Stencil 1 emerges and penetrates into the web 9, changed and thus the color of a halftone print or a polychromatic print can be controlled.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Screen Printers (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Color, Gradation (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP96106202A 1996-04-19 1996-04-19 Procédé d'impression demi-tons et machine d'impression pour sa réalisation Expired - Lifetime EP0802049B1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE59601451T DE59601451D1 (de) 1996-04-19 1996-04-19 Halbton-Druckverfahren und Druckmaschine zu seiner Durchführung
AT96106202T ATE177684T1 (de) 1996-04-19 1996-04-19 Halbton-druckverfahren und druckmaschine zu seiner durchführung
ES96106202T ES2129907T3 (es) 1996-04-19 1996-04-19 Procedimiento de impresion a media tinta y maquina de imprimir para su realizacion.
EP96106202A EP0802049B1 (fr) 1996-04-19 1996-04-19 Procédé d'impression demi-tons et machine d'impression pour sa réalisation
US08/833,450 US5907996A (en) 1996-04-19 1997-04-07 Half-tone printing process
JP9093966A JP3046780B2 (ja) 1996-04-19 1997-04-11 ハーフトーン印刷方法及びハーフトーン印刷装置
CN97104202A CN1078133C (zh) 1996-04-19 1997-04-18 半色调印刷方法及实现该方法的印刷机

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96106202A EP0802049B1 (fr) 1996-04-19 1996-04-19 Procédé d'impression demi-tons et machine d'impression pour sa réalisation

Publications (2)

Publication Number Publication Date
EP0802049A1 true EP0802049A1 (fr) 1997-10-22
EP0802049B1 EP0802049B1 (fr) 1999-03-17

Family

ID=8222691

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96106202A Expired - Lifetime EP0802049B1 (fr) 1996-04-19 1996-04-19 Procédé d'impression demi-tons et machine d'impression pour sa réalisation

Country Status (7)

Country Link
US (1) US5907996A (fr)
EP (1) EP0802049B1 (fr)
JP (1) JP3046780B2 (fr)
CN (1) CN1078133C (fr)
AT (1) ATE177684T1 (fr)
DE (1) DE59601451D1 (fr)
ES (1) ES2129907T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2002915C2 (en) * 2009-05-22 2010-11-23 Mps Holding B V PRINTING MODULE AND PRINTING MACHINE PROVIDED WITH SUCH A PRINTING MODULE.

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59914564D1 (de) * 1999-04-14 2008-01-10 Daetwyler Ag Verfahren zur Erzeugung von Gravurdaten
JP6131826B2 (ja) * 2013-10-30 2017-05-24 トヨタ紡織株式会社 乗物用シート
CN107901646B (zh) * 2017-11-21 2020-01-14 三河市数印通科技有限公司 一种解决数码印刷同色异谱现象的数码印刷方法
CN109177451A (zh) * 2018-07-30 2019-01-11 如皋市金轶纺织有限公司 纱线数码刮涂机
NL2023203B1 (en) * 2019-05-27 2020-12-02 Spgprints B V Screen printing, in particular rotary screen printing of textile materials

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2605016A1 (de) * 1976-02-10 1977-08-11 Mitter & Co Rotationsdruckmaschine, insbesondere siebdruckmaschine mit mindestens einer druckstation
DE8905925U1 (de) * 1989-05-11 1990-04-12 MBK Maschinenbau Kiefersfelden GmbH, 8205 Kiefersfelden Einrichtung zum winkelsynchronen Antreiben einzelner Druckschablonen einer Rotationssiebdruckmaschine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4546700A (en) * 1981-12-30 1985-10-15 Kollmorgen Technologies Corporation Method and apparatus for sensing and maintaining color registration
DE58901780D1 (de) * 1988-01-14 1992-08-13 Gretag Ag Verfahren und vorrichtung zur farbregelung einer druckmaschine.
DE59003421D1 (de) * 1989-07-14 1993-12-16 Gretag Ag Verfahren zur Bestimmung der Farbmasszahldifferenzen zwischen zwei mit hilfe einer Druckmaschine gedruckten Rasterfeldern sowie Verfahren zur Farbsteuerung oder Farbregelung des Druckes einer Druckmaschine.
JP2599068B2 (ja) * 1991-10-24 1997-04-09 大日本スクリーン製造株式会社 網点形成方法
DE4240077C2 (de) * 1992-11-28 1997-01-16 Heidelberger Druckmasch Ag Verfahren zur zonalen Steuerung/Regelung der Farbführung in einer Druckmaschine
ATE167111T1 (de) * 1996-04-19 1998-06-15 Schablonentechnik Kufstein Ag Halbtonschablone sowie verfahren und vorrichtung zu ihrer herstellung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2605016A1 (de) * 1976-02-10 1977-08-11 Mitter & Co Rotationsdruckmaschine, insbesondere siebdruckmaschine mit mindestens einer druckstation
DE8905925U1 (de) * 1989-05-11 1990-04-12 MBK Maschinenbau Kiefersfelden GmbH, 8205 Kiefersfelden Einrichtung zum winkelsynchronen Antreiben einzelner Druckschablonen einer Rotationssiebdruckmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2002915C2 (en) * 2009-05-22 2010-11-23 Mps Holding B V PRINTING MODULE AND PRINTING MACHINE PROVIDED WITH SUCH A PRINTING MODULE.
EP2253469A1 (fr) * 2009-05-22 2010-11-24 MPS Holding B.V. Module d'impression et machine équipée dudit module

Also Published As

Publication number Publication date
CN1078133C (zh) 2002-01-23
EP0802049B1 (fr) 1999-03-17
CN1165091A (zh) 1997-11-19
ATE177684T1 (de) 1999-04-15
JP3046780B2 (ja) 2000-05-29
ES2129907T3 (es) 1999-06-16
DE59601451D1 (de) 1999-04-22
US5907996A (en) 1999-06-01
JPH1035076A (ja) 1998-02-10

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