WO2015117807A1 - Groupe d'impression pour machine de flexographie - Google Patents

Groupe d'impression pour machine de flexographie Download PDF

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Publication number
WO2015117807A1
WO2015117807A1 PCT/EP2015/050763 EP2015050763W WO2015117807A1 WO 2015117807 A1 WO2015117807 A1 WO 2015117807A1 EP 2015050763 W EP2015050763 W EP 2015050763W WO 2015117807 A1 WO2015117807 A1 WO 2015117807A1
Authority
WO
WIPO (PCT)
Prior art keywords
plate cylinder
printing unit
plate
cylinder
printing
Prior art date
Application number
PCT/EP2015/050763
Other languages
German (de)
English (en)
Inventor
Guntmar M. LUDIN
Original Assignee
CONPRINTA GmbH & Co. KG
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 CONPRINTA GmbH & Co. KG filed Critical CONPRINTA GmbH & Co. KG
Priority to EP15702151.0A priority Critical patent/EP3102413A1/fr
Publication of WO2015117807A1 publication Critical patent/WO2015117807A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/007—Use of printing belts

Definitions

  • the invention relates to a printing unit for a flexographic printing press, comprising
  • a plate cylinder for supporting one on a flexible endless belt
  • a support cylinder usually referred to as a plate cylinder, for supporting a plate carrier wrapping around it.
  • the trained as a belt cliché carrier consists of a flexible but tensile film material, has a length that is significantly larger than the circumference of
  • Plate cylinder is, and is connected at its ends to an endless belt or connected in the final assembled state.
  • a relief made of an elastic material is fixed on the cliché carrier.
  • a clamping cylinder is arranged, which also in the final assembled state of the
  • Envelope carrier is entwined and whose distance from the plate cylinder is variable in order to clamp plate carriers of different lengths between clamping and plate cylinder can.
  • Further elements of typical flexographic printing machines are an impression cylinder and a dyeing roller.
  • the impression cylinder is substantially parallel to the
  • Plate cylinder arranged, with its distance to this is variable to form a defined pressure gap.
  • the dyeing roller is used for coloring the plate and is also arranged at a variable distance to the plate cylinder substantially parallel to this.
  • the dyeing roller is connected to a paint reservoir so that its surface wets with ink during operation of the printing unit and this is transferred to the latter during the rolling of the dyeing roller on the cliché.
  • the plate cylinder is set in rotational motion. Both in the pressed and in the spaced state of the impression cylinder, this leads to a transport movement of the plate carrier.
  • This is frictional entrainment, wherein the frictional forces between the surface of the plate cylinder and the inside of the plate carrier depend on a number of factors.
  • the structural nature of both surfaces plays an important role.
  • the weight of the plate carrier together with the cliché and the tensioning force set on the clamping cylinder influence the resulting friction.
  • the current speed of rotation of the plate cylinder plays a role.
  • Plate cylinder surface and inside of the plate carrier is a sensitive in terms of print quality size.
  • the transport speed of the plate carrier must match the transport speed of the substrate very exactly. During the printing process, significant flexing forces occur on the elastic
  • any such intervention means shutdown of the printing unit, an opening of the plate carrier endless belt and a new, modified connection of its ends. Then the printing unit must be started up again and the success of the measure checked. This is always associated with considerable loss of time and pressure.
  • this control or regulation can take place during the current printing operation.
  • the interior of the plate cylinder can be subjected to an overpressure, which leads to an escape of air from the openings in the plate cylinder surface.
  • air can pass between the plate cylinder surface and the inside of the plate carrier to a defined extent.
  • the amount of air is dependent on the size and number of breakthroughs and the applied pressure in the interior of the plate cylinder. It is therefore very accurately adjustable within wide limits. Note that this approach is completely counterproductive to conventional approaches in printing press technology.
  • Guiding pins arranged. These guide pins correspond with both sides marginal rows of holes in the cliché carrier. In the final assembly state, the guide pins pass through the holes in the plate carrier in the contact area between the plate cylinder and the plate carrier. This can be low managers between the
  • the printing unit according to the invention preferably also has such pin wheels, which are known in principle from the prior art.
  • the compressed air source is coupled to a control unit, which is further coupled to a sensor device for detecting a measured variable relating to at least one of the pin wheels, wherein the
  • Pin wheel-dependent parameters can be determined, from which the quality of the current operating setting of the printing unit can be determined and, if necessary, corrections, namely by appropriate activation or control change of the compressed air source, i.
  • corrections of the friction between plate cylinder and plate carrier be made.
  • a loop is established, i.
  • the sensor system conveniently detects a pin wheel-dependent parameter which itself is (indirectly) changed by a change in the pressure source control.
  • the sensor device comprises a torque sensor, by means of which a torque acting on at least one of the pinwheels can be measured.
  • a torque sensor by means of which a torque acting on at least one of the pinwheels can be measured.
  • the pinwheels like it would be required in synchronism of printing material and plate carrier, synchronized with the transport speed of the printing material driven, would a
  • Control unit would be transmitted. With appropriate adjustment of
  • Compressed air control i. Adjustment of friction between plate cylinder and
  • the sensor device comprises a force sensor, by means of which a tangential and / or axial force acting on the guide pins can be measured.
  • a force sensor By means of which a tangential and / or axial force acting on the guide pins can be measured.
  • Such a sensor would be guide pin based and would sense forces acting on individual (some or all) guide pins.
  • tangential forces also detected by the torque sensor
  • This misalignment parameter can also be corrected by correcting the friction between the plate cylinder and the plate carrier.
  • such a force sensor is quite complicated and complicated in terms of their integration into the intended
  • the sensor device comprises an image detector directed onto the end face of the pin wheel and synchronized with its rotational speed.
  • the generated image data can be evaluated, in particular, to determine whether the relative position of the guide pin and hole deviates from the optimal, concentric alignment and, if so, in which direction
  • Deviation occurs. This can be simultaneously misalignments in axial as well as in Detect tangential direction and combat by appropriate countermeasures in the control of the compressed air source.
  • control of the compressed air source is to be understood here wide and not only describes the setting of a predetermined overpressure in the plate cylinder interior.
  • This measure also allows the amount of air introduced between the plate cylinder surface and the inner surface of the plate carrier to vary.
  • Technically feasible such a measure, for example, by movement of sliding elements in the interior of the plate cylinder with which some or all breakthroughs in the plate cylinder surface are completely or partially covered.
  • an ionization source for at least partial ionization of at least that portion of the air from the compressed air source, which traverses the openings in the surface of the plate cylinder, is provided.
  • the ionization source may be part of the compressed air source, arranged in the interior of the plate cylinder or provided in the region of the openings in the plate cylinder surface.
  • Figure 1 a schematic sectional view through an inventive
  • Figure 2 a schematic sectional view of the plate cylinder of
  • FIG. 3 shows a schematic perspective view of a plate cylinder and a plate carrier of a printing unit according to the invention
  • FIG. 4 a schematic representation of exemplary hole / guide pin
  • Figure 1 shows a highly schematic representation of a sectional view through a
  • the printing unit 10 comprises a plate cylinder 12 and a relative to this movable in the direction of distance clamping cylinder 14th
  • Plate cylinder 12 and clamping cylinder 14 are wrapped together by a formed as an endless belt, flexible plate carrier 16, which carries on its outer side designed as a relief of elastic material flexographic printing plate 18.
  • the plate carrier 16 can be clamped so that the friction of its inner surface on the surface of the plate cylinder 12 is approximately in a predetermined range. A high-precision adjustment of this friction is not possible only by distance adjustment between plate cylinder 12 and clamping cylinder 14. Due to said friction, a rotation in which the plate cylinder 12 is displaced leads to a corresponding one
  • a counter-pressure cylinder 20 is arranged, of a web of a printing material 22, typically paper, metal or
  • Plastic film is entwined.
  • the distance between the plate cylinder 12 and the impression cylinder 20 is variable, so that there is a pressure gap 24 of predetermined width between the two cylinders 12, 20.
  • the printing gap 24 is so wide that in it the cliché 18 is pressed with a predetermined contact force against the substrate 22, so that located on the cliché ink is transferred to the substrate 22.
  • the cliché carrier 16 or the cliché 18 and the printing material 22 move with the correct setting with the same transport speed. This may differ from the rotational speed of the plate cylinder 12 due to the slippage between the plate carrier 16 and the plate cylinder 12.
  • a coloring roller 26 is shown, which is in communication with a paint reservoir 28. Also, the distance between the plate cylinder 12 and the coloring roller 26 is adjustable.
  • the dyeing roller 26 rotates and is wetted by ink from the ink reservoir 28 on its surface. By rolling on the cliché 18, the color is transferred to this and the cliché 18 so dyed.
  • the plate cylinder 12 is hollow and has a perforated surface. This is shown more clearly in FIG.
  • the interior of the hollow plate cylinder 12 is connected to a compressed air source, not shown, which ensures that in the interior of the plate cylinder 12, a pressure P1 prevails, which is higher than the external pressure PO.
  • FIG. 3 shows a highly schematic, perspective view of the plate cylinder 12 with its perforated by the openings 121 surface. A connection to the compressed air source, not shown, can be made via hollow axle journal 122.
  • pin wheels 30 are arranged, which carry a plurality of radially aligned, equidistant, conical pins 301 on their front side.
  • the pin wheels 30 are spaced in the manner of an exploded view from
  • Plate cylinder 12 shown. In the final assembly state, however, they form an axial extension of the plate cylinder 12, but are independent of this rotatable and in particular driven independently of him.
  • the cliché carrier 16, of which only a portion is shown in FIG. 3, has at its lateral outer edges a row of holes of equidistantly arranged perforations 161. The rows of holes correspond in distance and size of their perforations 161 with the guide pins 301 of the sprocket wheels 30.
  • the guide pins 301 enforce the perforations 181 in that angular range in which the plate cylinder 12 is wrapped by the plate carrier 16.
  • FIG. 4 serves to illustrate such a sensor system.
  • subfigure (a) the spatial relation of the
  • Guiding pins 301 are shown to the enforced perforations 161 of the disc carrier with perfect machine setting.
  • the cliché carrier 16 moves exactly at the speed of the pin wheels 30, which are synchronized with the speed of the printing material 22.
  • the plate cylinder 12 may rotate at a slightly different speed.
  • Partial figure (b) shows a speed mismatch.
  • Perforations 161 can be measured in different ways, for example by image detection, measuring the force on the guide pins 301 or measuring a resulting torque on the sprockets 30. Corresponding sensors are not shown separately in the figures.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)

Abstract

L'invention concerne un groupe d'impression pour une machine de flexographie, comprenant un cylindre porte-plaque (12) pour porter un cliché (18) fixé sur un support de cliché (16) formant un ruban souple sans fin, un rouleau tendeur (14) parallèle au cylindre porte-plaque (12) et se déplaçant verticalement par rapport à ce dernier pour tendre le support de cliché (16) entre le cylindre porte-plaque (12) et le rouleau tendeur (14). L'invention est caractérisée en ce que le cylindre porte-plaque (12) est creux, sa surface est pourvue de passages et son espace intérieur est relié à une source d'air comprimé réglable.
PCT/EP2015/050763 2014-02-05 2015-01-16 Groupe d'impression pour machine de flexographie WO2015117807A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15702151.0A EP3102413A1 (fr) 2014-02-05 2015-01-16 Groupe d'impression pour machine de flexographie

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201410101432 DE102014101432B3 (de) 2014-02-05 2014-02-05 Druckwerk für eine Flexodruckmaschine
DE102014101432.4 2014-02-05

Publications (1)

Publication Number Publication Date
WO2015117807A1 true WO2015117807A1 (fr) 2015-08-13

Family

ID=52010673

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/050763 WO2015117807A1 (fr) 2014-02-05 2015-01-16 Groupe d'impression pour machine de flexographie

Country Status (3)

Country Link
EP (1) EP3102413A1 (fr)
DE (1) DE102014101432B3 (fr)
WO (1) WO2015117807A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851582A (en) 1972-12-21 1974-12-03 Saueressig Gmbh Print machine for use with high solvent inks
EP0018147A1 (fr) * 1979-04-16 1980-10-29 Midland-Ross Corporation Dispositif d'entraînement d'une bande
DE3633155A1 (de) 1986-09-30 1988-04-07 Saueressig & Co Druckzylinder, insbesondere fuer das flexodruckverfahren
EP0290850A1 (fr) * 1987-05-07 1988-11-17 Conprinta Ltd. Machine d'impression flexographique, en particulier pour l'impression d'un fond
EP0308367A1 (fr) 1987-09-10 1989-03-22 Conprinta Ltd. Machine d'impression flexographique, en particulier pour l'impression préliminaire
DE4341262A1 (de) 1993-01-22 1994-07-28 Heidelberger Druckmasch Ag Vorrichtung für die Reduzierung von Materialausbuchtungen auf einer rohrförmigen Druckhülse

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851582A (en) 1972-12-21 1974-12-03 Saueressig Gmbh Print machine for use with high solvent inks
EP0018147A1 (fr) * 1979-04-16 1980-10-29 Midland-Ross Corporation Dispositif d'entraînement d'une bande
DE3633155A1 (de) 1986-09-30 1988-04-07 Saueressig & Co Druckzylinder, insbesondere fuer das flexodruckverfahren
EP0290850A1 (fr) * 1987-05-07 1988-11-17 Conprinta Ltd. Machine d'impression flexographique, en particulier pour l'impression d'un fond
EP0308367A1 (fr) 1987-09-10 1989-03-22 Conprinta Ltd. Machine d'impression flexographique, en particulier pour l'impression préliminaire
DE4341262A1 (de) 1993-01-22 1994-07-28 Heidelberger Druckmasch Ag Vorrichtung für die Reduzierung von Materialausbuchtungen auf einer rohrförmigen Druckhülse

Also Published As

Publication number Publication date
EP3102413A1 (fr) 2016-12-14
DE102014101432B3 (de) 2014-12-24

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