EP0641649A1 - Procédé pour éliminer un revêtement stencil sur formes pour l'impression sérigraphique et dispositif pour la mise en oeuvre de ce procédé - Google Patents

Procédé pour éliminer un revêtement stencil sur formes pour l'impression sérigraphique et dispositif pour la mise en oeuvre de ce procédé Download PDF

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Publication number
EP0641649A1
EP0641649A1 EP93114222A EP93114222A EP0641649A1 EP 0641649 A1 EP0641649 A1 EP 0641649A1 EP 93114222 A EP93114222 A EP 93114222A EP 93114222 A EP93114222 A EP 93114222A EP 0641649 A1 EP0641649 A1 EP 0641649A1
Authority
EP
European Patent Office
Prior art keywords
stencil
carrier
coating
template
liquid jet
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.)
Withdrawn
Application number
EP93114222A
Other languages
German (de)
English (en)
Inventor
Jürgen Stieler
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.)
STIELER, JUERGEN
Original Assignee
Stieler Juergen Kissel & Wolf GmbH
ALBERT ROSE ZWEIGNIEDERLASSUNG
Kissel & Wolf 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
Application filed by Stieler Juergen Kissel & Wolf GmbH, ALBERT ROSE ZWEIGNIEDERLASSUNG, Kissel & Wolf GmbH filed Critical Stieler Juergen Kissel & Wolf GmbH
Priority to EP93114222A priority Critical patent/EP0641649A1/fr
Publication of EP0641649A1 publication Critical patent/EP0641649A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/006—Cleaning, washing, rinsing or reclaiming of printing formes other than intaglio formes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/14—Forme preparation for stencil-printing or silk-screen printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/003—Cleaning arrangements or devices for screen printers or parts thereof
    • B41F35/004—Cleaning arrangements or devices for screen printers or parts thereof for cylindrical screens

Definitions

  • the invention relates to a method for removing, in particular, the stencil coating on stencil supports from screen printing forms, especially rotary printing forms, in which the coating is detached from the stencil support under the action of a liquid.
  • the invention further relates to an apparatus for performing this method.
  • a flat screen printing form in which the stencil support is stretched over a rectangular screen printing frame and essentially consists of a woven gauze made of plastic or metal threads.
  • a cylindrical printing form is used for rotary screen printing, in which the stencil carrier extends as a cylindrical jacket between two end rings.
  • the stencil holder for rotary printing forms is usually made of nickel.
  • parts of the stencil carrier that are not supposed to print are made opaque by means of a barrier layer.
  • the color-opaque and the color-permeable areas then form the screen printing stencil.
  • stencil material is applied to the liquid in either with the aid of a doctor blade process or a dipping process Stencil holder applied. It is also known to apply the stencil material in solid form, for example in powder or film form (DE-OS 36 37 642). If the stencil material is a photo layer, it is exposed after drying with the interposition of a corresponding slide, which contains the pattern to be transferred to the stencil material in the form of transparent or opaque patterns.
  • the stencil coating on the stencil carrier must be removed. According to the prior art, this is done in the case of rotary stencils by means of a chemical process. A mixture of hydrofluoric acid, phenol, formic acid and methylene chloride is used for this. This mixture is very toxic, so its disposal is problematic.
  • the object of the invention is therefore to provide a method with which the stencil coating of screen printing forms can be disposed of without problems without use. Can remove agent. Another object is to design an apparatus for performing this method.
  • the first part of the object is achieved according to the invention in that at least one liquid jet with an impact pressure sufficient for the mechanical or hydraulic detachment is directed onto the template carrier and the Coating is detached successively by relative movement between the liquid jet and the stencil carrier, the stencil carrier being supported on the side facing away from the liquid jet at least in the area where it strikes.
  • the basic idea of the invention is therefore to mechanically detach the stencil coating from the stencil carrier by hydraulic means.
  • Ecologically harmless liquids can be used for this process, although the use of water lends itself to its easy availability and unproblematic disposal. It is within the scope of the invention if the method also uses several liquid jets at the same time in order to accelerate the detachment process.
  • the template holder is held stationary and the liquid jet is moved relative to the template holder.
  • This type of relative movement allows a simple construction of a device suitable for carrying out the method. If the stencil carrier of a rotary printing form is to be cleaned, it is provided according to the invention that it is rotated during the cleaning process, the liquid jet being moved linearly parallel to the longitudinal axis of the stencil carrier.
  • the waste water resulting from the process can be Prepare another with the usual measures by separating the coating material from the water, for example by filtration.
  • this device Special features of this device are a pressure generating device and a nozzle unit, with the aid of which a liquid jet can be generated and directed onto the stencil holder fixed in the holding device, a drive device ensuring that the liquid jet covers the entire surface of the stencil holder.
  • a predetermined, time-saving movement sequence is provided for this.
  • a particularly expedient embodiment of the support device consists in providing a support hose onto which the stencil holder can be pulled up.
  • the support hose should be designed with a reinforcement that limits its radial expandability, for example in the form of a metal coating or metal foil. This prevents the support hose from inflating to a predetermined extent and protects the support hose from the action of the liquid jet.
  • the holding device for the stencil holder of the rotary printing form is expediently provided with a rotary drive for rotating it about its longitudinal axis.
  • a rotary drive for example, an axis of rotation can be provided, onto which the template carrier can be pulled up.
  • the twisting of the template carrier facilitates the guidance of the liquid jet to capture the entire surface of the template carrier.
  • a movement device for moving the nozzle unit relative to the stencil holder belongs to the drive device.
  • the stencil carrier can then be held stationary, and in the case of a rotary printing form the stationary arrangement can be combined with a rotatability of the stencil carrier.
  • the movement device is then expediently designed as a linear movement device which moves the nozzle unit in one plane.
  • the linear movement device can be designed such that the nozzle head can be moved parallel to the longitudinal axis of the template carrier of the rotary printing form, if at the same time it is ensured that the template holder is rotated during the cleaning process.
  • the nozzle unit is movably guided transversely to the template carrier fixed in the holding device in order to be able to set the optimal distance between the nozzle unit and the template carrier.
  • the nozzle unit should have spacers for contact with the template carrier, for example in the form of rollers.
  • the drive for the pressure generating device can be done in many ways.
  • An air pressure drive appears to be particularly suitable since it can be used to easily achieve a sufficient pressure transmission ratio.
  • the device (1) shown in the figures has a device frame (2) which has an attachment (3) on the left-hand side.
  • the attachment (3) contains an industrial computer for controlling the device (1), which can be operated via a control panel (4) with display devices.
  • a drive shaft (5) is also rotatably mounted in the attachment (3).
  • the other end of this drive shaft (5) is rotatably held in a bearing block (6) standing up from the device frame (2).
  • an electrically operated drive motor (7) which can set the drive shaft (5) in rotary motion via a reduction gear (8).
  • a belt drive (9) is provided in the device frame (2), with its upper run (10 ⁇ ) and lower run (11) between a left-hand deflection wheel (12) arranged below the attachment (3) and one at the end of the device frame (2 ) arranged, right-hand deflection wheel (13) extends.
  • the left-hand deflection wheel (12) is set in rotation by an electric motor (14) via a pulley (15) and a drive belt (16), the direction of rotation of the electric motor (14) being reversible.
  • the upper run (10 ⁇ ) also runs over two deflection rollers (17, 18) so that the upper run (10 ⁇ ) runs between the two deflection rollers (17, 18) above the device frame.
  • the upper run (10 ⁇ ) of the belt drive (9) is connected to a nozzle unit (19) which is located approximately at the level of the drive shaft (5). Via the connection to the upper run (10 ⁇ ), the nozzle unit (19) can be moved back and forth in both directions along the drive shaft (5).
  • a pressure generating device (20 ⁇ ) belongs to the nozzle unit (19). It has a compressed air supply (21) and a water supply (22) in the form of spiral hoses. Compressed air reaches the pressure generating device (20 ⁇ ) up to a maximum of 11 bar via the compressed air supply (21) and sets the water brought in via the water supply (22) in accordance with a maximum pressure ratio of 1: 135 under a maximum pressure of 1450 ⁇ bar (static).
  • Such pressure generating devices (20 ⁇ ) are known for example as hydraulic pumps “Maximator” (registered trademark of Schmidt, Kranz & Co. GmbH, D-5620 ⁇ Velbert 11).
  • a cylindrical template support (23) in the form of a screen provided with a large number of fine openings is drawn onto the drive shaft (5), essentially coaxially.
  • the stencil carrier (23) is provided in certain areas with a stencil coating made of thermally hardened stencil material in order to make these areas impermeable to the printing ink. Other areas are not covered by the stencil coating, i.e. permeable to the printing ink.
  • the template carrier (23) is the part of a rotary template that is freed of end rings.
  • the template carrier (23) is non-rotatably connected at the end to the drive shaft (5) via cone rings (24, 25), so that it rotates with it.
  • the template support (23) is drawn onto a support tube (26) which is cylindrical in cross-section and extends essentially over its entire length.
  • the support hose (26) is rotatably connected to the drive shaft (5) at both ends. It is inflated with compressed air so that an annular pressure chamber (27) results between the drive shaft (5) and the support hose (26).
  • the support tube (26) is surrounded by a nickel foil (28) which limits the inflation of the support tube (26) to a predetermined amount.
  • the nickel foil (28) has a thickness of approximately 0.3 to 0.4 mm.
  • the nozzle unit (19) has a nozzle head housing (29) which sits on a nozzle head slide (30 ().
  • the nozzle head slide (30 ⁇ ) is slidably mounted on the device frame (2) parallel to the longitudinal axis of the drive shaft (5) and is connected to the upper run (10 ⁇ ) of the belt drive (9).
  • Guide rollers (31, 32) are mounted between the nozzle head housing (29) and nozzle head slide (30 ⁇ ), on which the nozzle head housing (29) rests.
  • the guide rollers (31, 32) have axes of rotation extending parallel to the drive shaft (5) and allow the nozzle head housing (29) to move horizontal, but extending transversely to the direction of movement of the nozzle head slide (30 ⁇ ).
  • adjustment devices are provided between the nozzle head slide (30 ⁇ ) and the nozzle head housing (29), with which the position of the nozzle head housing (29) can be adjusted in relation to the nozzle head slide (30 ⁇ ), which are omitted here for the sake of clarity.
  • the nozzle head housing (29) has an essentially rectangular cross section, but is closed off on the drive shaft side by an almost semicircular bulkhead (33).
  • the bulkhead (33) has bends (34, 35) directed towards the drive shaft (5) at the end.
  • bearing brackets (36, 37) are arranged at a vertical distance from one another, in each of which a pressure roller (38, 39) is freely rotatable.
  • nozzle head housing (29) there is a horizontal nozzle tube (40 ⁇ ) which protrudes outwards through the bulkhead (33) and has a nozzle (41) at the free end.
  • the nozzle pipe (40 ⁇ ) is connected via a connector (42) to a pressure pipe (43) which is guided through the rear wall (44) of the nozzle head housing (29) to the outside to a pressure outlet (45) of the pressure generating device (20 ⁇ ).
  • the pressure generating device (20 ⁇ ) is attached via two angle plates (46, 47) to a support plate (48) which in turn is attached to the rear wall (44) of the nozzle head housing (29). In this way, the pressure generating device (20 ⁇ ) is moved with the nozzle head housing (29).
  • the template holder (23) is first pushed onto the drive shaft (5) or the support hose (26) from the right-hand end - after removing the bearing block (6).
  • the Nozzle unit (19) brought into one of the end positions, the nozzle head housing (29) being retracted from the drive shaft (5) in such a way that the pressure rollers (38, 39) are not yet in contact with the template carrier (23).
  • the nozzle head housing (29) is moved in the direction of the template carrier (23) until the pressure rollers (38, 39) come into contact.
  • the inside of the template carrier (23) comes into contact with the support tube (26) or the nickel foil (28) due to a slight eccentric displacement in the region of the pressure rollers (38, 39), which is exaggerated in FIG. (2).
  • the drive shaft (5) is now set in rotation by actuation of the drive motor (7).
  • the pressure generating device (20 ⁇ ) is put into operation, so that it is under high pressure water via the pressure pipe (43), the connecting piece (42), the nozzle pipe (40 ⁇ ) and the nozzle (41) with the formation of a water jet (49 ) sprayed on the outside of the template carrier (23).
  • the abrasive effect of the water jet (49) is so strong that the stencil coating on the stencil carrier (23) is detached.
  • the electric motor (14) is started in a direction of rotation which moves the upper run (10 ⁇ ) in such a way that the associated nozzle head carriage (30 ⁇ ) from the selected end position is slowly moved towards the other end position.
  • the stencil coating is peeled off from the stencil carrier (23) in a helix of a corresponding pitch.
  • the pressure exerted by the water jet (49) is collected and destroyed by the flexible support hose (26), the nickel foil (28) protecting the support hose (26) from direct action.
  • the waste water consisting of the supplied water and the peeled off parts of the stencil coating is on the Top of the device frame (2) caught and derived. Otherwise, the area above the device frame (2) is encapsulated in a watertight manner by a transparent spray housing (50 ⁇ ), so that any water leakage is avoided.
  • the angular velocity of the drive shaft (5), the advance of the upper run (10 ⁇ ) of the belt drive (9), the water pressure impressed in the pressure generating device (20 ⁇ ) and the distance of the nozzle (41) from the rotary printing form (22) are coordinated with one another in such a way that a reliable detachment of the stencil coating is guaranteed with the greatest possible protection of the stencil carrier (23).
  • some or all of the aforementioned parameters can also be adjusted in order to enable adaptation to different diameters of the template holder (23) and in particular to different materials for the template coating.
  • the parameters can be set on the basis of appropriate tests.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP93114222A 1993-09-04 1993-09-04 Procédé pour éliminer un revêtement stencil sur formes pour l'impression sérigraphique et dispositif pour la mise en oeuvre de ce procédé Withdrawn EP0641649A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93114222A EP0641649A1 (fr) 1993-09-04 1993-09-04 Procédé pour éliminer un revêtement stencil sur formes pour l'impression sérigraphique et dispositif pour la mise en oeuvre de ce procédé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP93114222A EP0641649A1 (fr) 1993-09-04 1993-09-04 Procédé pour éliminer un revêtement stencil sur formes pour l'impression sérigraphique et dispositif pour la mise en oeuvre de ce procédé

Publications (1)

Publication Number Publication Date
EP0641649A1 true EP0641649A1 (fr) 1995-03-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93114222A Withdrawn EP0641649A1 (fr) 1993-09-04 1993-09-04 Procédé pour éliminer un revêtement stencil sur formes pour l'impression sérigraphique et dispositif pour la mise en oeuvre de ce procédé

Country Status (1)

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EP (1) EP0641649A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0865920A2 (fr) * 1997-03-18 1998-09-23 Ichinose International Incorporated Presse rotative sérigraphique à imprimer sur tissus
DE19933525A1 (de) * 1999-07-16 2001-01-18 Schablonentechnik Kufstein Ag Verfahren und Vorrichtung zum Herstellen einer Siebdruckschablone
EP1080885A1 (fr) * 1999-09-01 2001-03-07 Schablonentechnik Kufstein Aktiengesellschaft Procédé et appareil pour la réalisation de pochoirs cylindriques

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB732435A (en) * 1951-06-19 1955-06-22 Hunter Penrose Ltd Improvements in or relating to apparatus for applying a fluid coating material to a cylinder
GB2209018A (en) * 1987-08-25 1989-04-26 Bicc Plc Screen printing
EP0320137A1 (fr) * 1987-11-25 1989-06-14 Zed Instruments Limited Appareil pour la gravure au laser pour la fabrication d'écrans sérigraphiques cylindriques
EP0391491A1 (fr) * 1989-04-07 1990-10-10 Stork X-Cel B.V. Procédé et dispositif pour enlever le matériau formant le dessin d'un pochoir sérigraphique
WO1992002368A1 (fr) * 1990-08-06 1992-02-20 Zed Instruments Limited Gravure d'un element d'impression
WO1992012013A1 (fr) * 1991-01-12 1992-07-23 Technijet Limited Procede et dispositif de nettoyage d'un cylindre de serigraphie
EP0562149A1 (fr) * 1992-03-27 1993-09-29 Schablonentechnik Kufstein Aktiengesellschaft Appareil d'usinage d'un cylindre creuse à paroi mince par un laser

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB732435A (en) * 1951-06-19 1955-06-22 Hunter Penrose Ltd Improvements in or relating to apparatus for applying a fluid coating material to a cylinder
GB2209018A (en) * 1987-08-25 1989-04-26 Bicc Plc Screen printing
EP0320137A1 (fr) * 1987-11-25 1989-06-14 Zed Instruments Limited Appareil pour la gravure au laser pour la fabrication d'écrans sérigraphiques cylindriques
EP0391491A1 (fr) * 1989-04-07 1990-10-10 Stork X-Cel B.V. Procédé et dispositif pour enlever le matériau formant le dessin d'un pochoir sérigraphique
WO1992002368A1 (fr) * 1990-08-06 1992-02-20 Zed Instruments Limited Gravure d'un element d'impression
WO1992012013A1 (fr) * 1991-01-12 1992-07-23 Technijet Limited Procede et dispositif de nettoyage d'un cylindre de serigraphie
EP0562149A1 (fr) * 1992-03-27 1993-09-29 Schablonentechnik Kufstein Aktiengesellschaft Appareil d'usinage d'un cylindre creuse à paroi mince par un laser

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0865920A2 (fr) * 1997-03-18 1998-09-23 Ichinose International Incorporated Presse rotative sérigraphique à imprimer sur tissus
EP0865920A3 (fr) * 1997-03-18 1999-03-10 Ichinose International Incorporated Presse rotative sérigraphique à imprimer sur tissus
CN1093469C (zh) * 1997-03-18 2002-10-30 株式会社一濑国际 旋转筛网纺织印花机
DE19933525A1 (de) * 1999-07-16 2001-01-18 Schablonentechnik Kufstein Ag Verfahren und Vorrichtung zum Herstellen einer Siebdruckschablone
EP1080885A1 (fr) * 1999-09-01 2001-03-07 Schablonentechnik Kufstein Aktiengesellschaft Procédé et appareil pour la réalisation de pochoirs cylindriques

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