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EP4028261B1 - Procédé et dispositif de finition d'épreuves - Google Patents

Procédé et dispositif de finition d'épreuves Download PDF

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Publication number
EP4028261B1
EP4028261B1 EP20771457.7A EP20771457A EP4028261B1 EP 4028261 B1 EP4028261 B1 EP 4028261B1 EP 20771457 A EP20771457 A EP 20771457A EP 4028261 B1 EP4028261 B1 EP 4028261B1
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EP
European Patent Office
Prior art keywords
printing material
radiation
transport path
pressure roll
printing
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.)
Active
Application number
EP20771457.7A
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German (de)
English (en)
Other versions
EP4028261C0 (fr
EP4028261A1 (fr
Inventor
Georg Barth
André PANITZKE
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.)
KAMA GmbH
Original Assignee
KAMA GmbH
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Filing date
Publication date
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Application filed by KAMA GmbH filed Critical KAMA GmbH
Publication of EP4028261A1 publication Critical patent/EP4028261A1/fr
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Publication of EP4028261C0 publication Critical patent/EP4028261C0/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F16/00—Transfer printing apparatus
    • B41F16/0006—Transfer printing apparatus for printing from an inked or preprinted foil or band
    • B41F16/002—Presses of the rotary type
    • B41F16/0033—Presses of the rotary type with means for applying print under pressure only, e.g. using pressure sensitive adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F19/00—Apparatus or machines for carrying out printing operations combined with other operations
    • B41F19/002—Apparatus or machines for carrying out printing operations combined with other operations with means for applying specific material other than ink
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F19/00—Apparatus or machines for carrying out printing operations combined with other operations
    • B41F19/002—Apparatus or machines for carrying out printing operations combined with other operations with means for applying specific material other than ink
    • B41F19/004—Apparatus or machines for carrying out printing operations combined with other operations with means for applying specific material other than ink with means for applying adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/08—Print finishing devices, e.g. for glossing prints

Definitions

  • the invention relates to improved methods and devices for print finishing.
  • Print finishing refers to changing the surface of a printing material such as paper, cardboard, etc. through an additional coating. This gives the paper either a certain shine, a structure or pre-defined effects that it does not have in its original, unprocessed form. Print finishing involves changing the paper surface, which, on the one hand, makes the print product as a whole more durable by protecting it from wear and, on the other hand, contributes to its sale or to the sale of the products or services depicted in it through a visual or tactile enhancement.
  • Finishing processes can be based on coating, joining, forming or separating the printing material.
  • the processes in which finishing is carried out by joining include laminating, laminating and foil transfer.
  • Film transfer includes finishing processes in which transfer layers are removed from a carrier film and transferred to the printing material. This group of processes includes hot foil stamping, cold foil transfer and foil transfer to toner realized as part of digital printing.
  • special... Films hologram films
  • Hot foil stamping Under the effect of pressure, temperature and contact time, transfer layers of an embossing foil are transferred to the material using an embossing stamp, which simultaneously undergoes a permanent change in shape.
  • Hot foil stamping takes place as flat stamping with a tool or relief stamping with a die and male die. Either flat embossing stamps or embossing rollers are used as embossing tools, which are heated for the foil transfer.
  • the temperature depends on the embossing foil used, the printing material and the machine type and is between 80...220 °C.
  • the embossing foil consists of several layers.
  • One or more transfer layers are either applied directly to a polyester carrier film, or the transfer layers are applied to a separating layer on the carrier film, which melts under the influence of heat and thus releases the transfer layers.
  • the transfer layers include an optically active layer and an adhesive layer (reactivatable adhesive).
  • the adhesive layer serves to create a permanent and smudge-proof connection between the optically effective layer and the printing material. Color pigments, metal pigments and plastics can be used for the optically effective layer, which leads to very different visual effects.
  • Cold foil transfer achieves similar visual effects to hot foil stamping, but without material deformation.
  • a plastic layer that is removed from a carrier film and, if necessary, subsequent overprinting can be used to achieve a wide variety of metal effects.
  • cold foil finishing is carried out, for example, with two additional printing units in an offset printing machine.
  • a special adhesive is applied to the printing material using a standard printing form. Since the characteristics of offset printing come into play, small screen elements and fine line thicknesses can be transferred.
  • a second printing unit is equipped with a film transfer device. The film is guided from the unwinding station into the printing gap between the blanket cylinder and the printing cylinder and brought into contact with the printing material.
  • the film consists of several layers that are located on a carrier film.
  • the color is provided by an aluminum layer and a protective varnish layer, the coloring of which influences the color impression.
  • the transfer layers By adhesion of an adhesive layer to the printed adhesive layer, the transfer layers remain adhered to the substrate.
  • the carrier film is then wound up again.
  • the visual effect of cold foils is similar to that of embossing foils. However, there is no haptic effect because there is no deformation or noticeable surface change.
  • Cold foils are used in the production of various printed products, for example in label printing, on high-quality packaging or in commercial printing.
  • the cost advantage is the fact that finishing can be done inline in the printing press and, compared to other types of finishing, no special tools have to be produced.
  • the prerequisite for cold foil transfer is two additional printing units and the foil transfer station.
  • US 2009/078364 A1 describes a printing press having a transfer device for transferring gold foil and the like.
  • the transfer device contains a printing cylinder and a film transfer device.
  • the impression cylinder receives sheets from a delivery cylinder.
  • the film transfer device presses the transfer film onto the sheets to which a UV-curable resin varnish has been applied as an adhesive to transfer a gold foil or the like from the transfer film to the sheets.
  • the transfer film is pressed onto the resin varnish over the sheets. Then lamps shine ultraviolet rays from above onto the pressed film to cure the resin varnish.
  • WO 2009/053316 A2 relates to a coating system for transferring imaging or covering layers from a transfer film to a printing material.
  • at least one film application module is used in a sheet-fed rotary printing machine.
  • the coated foil sheet can be dried from its back.
  • the corresponding drying device is downstream of the film coating.
  • the film application should be carried out on film printing materials in conjunction with an offset printing machine with upstream or downstream varnish modules.
  • additional printing and intermediate drying can be carried out, for example with Using a UV dryer.
  • the use of heat-reduced UV dryer systems in conjunction with foil application can be used for cold foil lamination.
  • US 2015/343761 A1 describes a process for cold stamping on a three-dimensional object.
  • the object is held by a holding device so that it can rotate about an axis of rotation.
  • an adhesive is applied to the object at a first work station.
  • a transfer film is pressed onto the object by a pressing device at a second work station.
  • the adhesive is hardened at the second work station.
  • One object of the present invention is to further develop and improve the known methods and devices for print finishing, in particular for cold foil transfer.
  • What is initially proposed for this is a method for print finishing, in which a printing material and a transfer film with a transfer layer are provided, the printing material is moved along a transport path at a transport speed, and a radiation-curing plastic is applied to the printing material during the movement of the printing material in a first section of the transport path is applied, after the radiation-curing plastic has been applied, the printing material is irradiated in a second section of the transport path, while at the same time the transfer film is pressed onto the printing material and moved with it along the transport path, and when leaving the second section of the transport path, the transfer film is removed from the printing material becomes.
  • a radiation-curing plastic is used as the adhesive instead, which is initially present as a resin, i.e. liquid or pasty and has no or almost no adhesive strength. Only when this resin is irradiated with radiation of a specific wavelength does it become sticky and then harden. In this way, the transfer layer is removed from the transfer film in the areas in which the surface of the printing material has the resin of the radiation-curing plastic, while the transfer layer remains on the transfer film in the remaining areas.
  • nozzles of a printing device that is used to apply the resin to the printing material can no longer become clogged because the irradiation of the resin applied to the printing material only takes place after printing.
  • the printing material is moved horizontally and the transfer film is guided in the second area of the transport path around a partial circumference of a pressure roller, which is pressed onto the printing material.
  • This has particular advantages for the print finishing of printing materials in the form of individual sheets - in contrast to the roll-to-roll process.
  • the printing material and the transfer film only touch each other in a very short area, as seen in the transport direction, so that a relative displacement occurs Due to different transport routes, they cannot have a negative impact on the result of the processing.
  • the pressure roller is moved in rotation at a peripheral speed that is equal to the transport speed of the printing material.
  • the pressure roller is pressed onto the transport path when a printing material is moved under it and is raised when no printing material is moved under it. This avoids a paper jam that can occur as a result of the printing material colliding with the pressure roller pressed onto the transport path.
  • the pressure roller is provided as a radiation-permeable hollow body and a radiation source is provided in the pressure roller.
  • a radiation source is provided in the pressure roller.
  • the transfer film is pressed onto the printing material.
  • the irradiation can occur either beforehand, so that the curing process of the resin begins during the action of the pressure roller, or afterwards.
  • the pressure roller is a radiation-permeable hollow body in which a radiation source is arranged, the pressing of the film onto the printing material and the hardening of the resin of the radiation-curing plastic coincide, and the effect of the radiation takes place during the pressing of the pressure roller through the translucent hollow body.
  • a device for Print finishing which comprises the following: a transport device for moving a printing material along a transport path, a printing device for applying a radiation-curing plastic to the printing material in a first section of the transport path, a film feed device for feeding transfer film to a surface of the printing material in a second section of the transport path , and an irradiation device for curing the radiation-hardening plastic in the second section of the transport path, which comprises at least one radiation source.
  • the film feed device has at least one unwinder and one take-up reel as well as a pressure roller arranged between them, around which the transfer film is guided and which is pressed onto the printing material.
  • the pressure roller is movable back and forth between a lower position in which it presses on the transport path and an upper position in which it is lifted off the transport path. This makes it possible for the pressure roller to be pressed onto the transport path when a printing material is moved under it and to be raised when no printing material is moved under it. This avoids a paper jam that can occur as a result of the printing material colliding with the pressure roller pressed onto the transport path.
  • the transport device can, for example, have a belt conveyor on which the printing material is transported lying down.
  • the transport device advantageously has a suction belt conveyor on which the printing material is held by means of negative pressure.
  • the Suction belt conveyors can, for example, have a perforated conveyor belt guided around deflection rollers, with a so-called suction box being arranged between the deflection rollers, in the interior of which a negative pressure is generated by means of a pump.
  • At least one tension roller is arranged between the unwinder and the pressure roller and/or between the pressure roller and the take-up roller in order to produce a constant web tension in the transfer film.
  • the pressure roller is designed as a radiation-permeable hollow body and that the at least one radiation source is arranged in the pressure roller.
  • the irradiation device comprises, in addition to the at least one radiation source, at least one movably arranged aperture for directing the beam generated by the radiation source.
  • This aperture can, for example, comprise a hollow cylindrical body with a slot-shaped aperture opening which is rotatably arranged inside the pressure roller about its longitudinal axis.
  • Plastic that can be hardened by IR radiation is used, it is provided on the device side that the at least one radiation source emits IR radiation.
  • the at least one radiation source emits UV radiation.
  • the transport device 2 has a suction belt conveyor 21 on which the printing material 1 is held by means of negative pressure.
  • the suction belt conveyor 21 has a perforated conveyor belt guided around deflection rollers, with a suction box being arranged between the deflection rollers, in the interior of which a negative pressure is generated by a pump 22.
  • the transport device 2 in a first section of the transport path, there is a printing device 3 for applying a radiation-curing plastic to the Printing material 1 arranged.
  • the printing device 3 is designed in the manner of an inkjet printer, in which instead of a printing ink, a resin of a radiation-curing plastic is applied to the surface of the printing material 1, while the printing material 1 is moved past under the printing device 3 by the transport device 2.
  • the adhesive is activated to achieve dimensional stability of the printed image (so-called “pinning”).
  • a film feed device 4 for feeding transfer film to a surface of the printing material 1 is arranged in a second section of the transport path, also above the transport device 2.
  • the film feed device 4 comprises a uncoiler 41, a rewinder 43 and a pressure roller 42 arranged between the uncoiler 41 and the reel 43.
  • the transfer film 6 is guided around the pressure roller 42 and pressed onto the printing material 1.
  • an arrangement of two tension rollers 44 coupled to one another is arranged, which serves to produce a constant web tension in the transfer film 6.
  • the pressure roller 42 is moved back and forth by means of a yoke 45 and a pneumatic cylinder 46 acting on the yoke 45 between a lower position in which the pressure roller 42 presses on the transport path and an upper position in which the pressure roller 42 is lifted off the transport path movable.
  • the device further comprises a Irradiation device 5 with a UV lamp as a radiation source 51 for curing the radiation-curing plastic.
  • the pressure roller 42 is designed as a radiation-permeable hollow body and the UV lamp 51 is arranged in the pressure roller 42.
  • the irradiation device 5 also has a movably arranged aperture 52 for directing the beam generated by the radiation source 51, which is designed as a hollow cylindrical body with a slot-shaped aperture opening which is rotatable inside the pressure roller 42 about the longitudinal axis of the pressure roller 42.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Decoration By Transfer Pictures (AREA)

Claims (11)

  1. Procédé de finition d'impressions, dans lequel
    - un matériau à imprimer (1) et un film de transfert (6) avec une couche de transfert sont fournis,
    - le matériau à imprimer (1) est déplacé le long d'un chemin de transport à une vitesse de transport,
    - pendant le déplacement du matériau à imprimer (1), une matière plastique durcissant par rayonnement est appliquée sur le matériau à imprimer (1) dans une première section du chemin de transport,
    - après l'application de la matière plastique durcissant par rayonnement, le matériau à imprimer (1) est exposé à un rayonnement dans une deuxième section du chemin de transport, tandis que simultanément le film de transfert (6) est pressé sur le matériau à imprimer (1) et déplacé avec celui-ci le long du chemin de transport,
    et
    - lors de la sortie de la deuxième section du chemin de transport, le film de transfert (6) est retiré du matériau à imprimer (1),
    le matériau à imprimer (1) étant déplacé horizontalement à plat et le film de transfert (6) étant guidé dans la deuxième zone du chemin de transport autour d'une circonférence partielle d'un rouleau de pression (42), qui est pressé sur le matériau à imprimer (1), et le rouleau de pression (42) étant pressé sur le chemin de transport lorsqu'un matériau à imprimer (1) est déplacé en dessous et étant soulevé lorsqu'aucun matériau à imprimer (1) n'est déplacé en dessous.
  2. Procédé selon la revendication 1, dans lequel le rouleau de pression (42) est déplacé en rotation à une vitesse circonférentielle qui est égale à la vitesse de transport du matériau à imprimer (1).
  3. Procédé selon la revendication 1 ou 2, dans lequel le rouleau de pression (42) est fourni sous forme de corps creux perméable au rayonnement et une source de rayonnement (51) est fournie dans le rouleau de pression (42) .
  4. Dispositif de finition d'impressions, comprenant
    - un appareil de transport (2) pour déplacer un matériau à imprimer (1) le long d'un chemin de transport,
    - un appareil d'impression (3) pour appliquer une matière plastique durcissant par rayonnement sur le matériau à imprimer (1) dans une première section du chemin de transport,
    - un appareil d'amenée de film (4) pour amener un film de transfert (6) vers une surface du matériau à imprimer (1) dans une deuxième section du chemin de transport, et
    - un appareil d'exposition à un rayonnement (5) pour durcir la matière plastique durcissant par rayonnement dans la deuxième section du chemin de transport, qui comprend au moins une source de rayonnement (51),
    - l'appareil d'amenée de film (4) présentant au moins un dévidoir (41) et un enrouleur (43) ainsi qu'un rouleau de pression (42) agencé entre eux, autour duquel le film de transfert (6) est guidé et qui est pressé sur le matériau à imprimer (1), et
    - le rouleau de pression (42) pouvant être déplacé en va-et-vient entre une position inférieure dans laquelle il presse sur le chemin de transport et une position supérieure dans laquelle il est soulevé du chemin de transport.
  5. Dispositif selon la revendication 4, dans lequel l'appareil de transport (2) présente un transporteur à bande aspirante (21) sur lequel le matériau à imprimer (1) est maintenu par dépression.
  6. Dispositif selon la revendication 4 ou 5, dans lequel au moins un rouleau tendeur (44) est agencé entre le dévidoir (41) et le rouleau de pression (42) ou/et entre le rouleau de pression (42) et l'enrouleur (43) pour établir une tension de bande constante dans le film de transfert (6).
  7. Dispositif selon l'une quelconque des revendications 4 à 6, dans lequel le rouleau de pression (42) est réalisé sous forme de corps creux perméable au rayonnement et l'au moins une source de rayonnement (51) est agencée dans le rouleau de pression (42).
  8. Dispositif selon l'une quelconque des revendications 4 à 7, dans lequel l'appareil d'exposition à un rayonnement (5) comprend, outre l'au moins une source de rayonnement (51), au moins un diaphragme (52) agencé de manière mobile pour diriger le faisceau produit par la source de rayonnement (51).
  9. Dispositif selon les revendications 7 et 8, dans lequel le diaphragme (52) comprend un corps cylindrique creux avec une ouverture de diaphragme en forme de fente, qui est agencé à l'intérieur du rouleau de pression (42) de manière rotative autour de son axe longitudinal.
  10. Dispositif selon l'une quelconque des revendications 4 à 9, dans lequel la matière plastique durcissable par rayonnement peut être durcie par rayonnement IR et l'au moins une source de rayonnement (51) émet un rayonnement IR.
  11. Dispositif selon l'une quelconque des revendications 4 à 9, dans lequel la matière plastique durcissant par rayonnement peut être durcie par rayonnement UV et l'au moins une source de rayonnement (51) émet un rayonnement UV.
EP20771457.7A 2019-09-09 2020-08-28 Procédé et dispositif de finition d'épreuves Active EP4028261B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019124105.7A DE102019124105A1 (de) 2019-09-09 2019-09-09 Verfahren und Vorrichtung zur Druckveredelung
PCT/EP2020/074055 WO2021047922A1 (fr) 2019-09-09 2020-08-28 Procédé et dispositif de finition d'épreuves

Publications (3)

Publication Number Publication Date
EP4028261A1 EP4028261A1 (fr) 2022-07-20
EP4028261C0 EP4028261C0 (fr) 2023-12-06
EP4028261B1 true EP4028261B1 (fr) 2023-12-06

Family

ID=72473503

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20771457.7A Active EP4028261B1 (fr) 2019-09-09 2020-08-28 Procédé et dispositif de finition d'épreuves

Country Status (5)

Country Link
EP (1) EP4028261B1 (fr)
JP (1) JP7446411B2 (fr)
DE (1) DE102019124105A1 (fr)
IL (1) IL291132A (fr)
WO (1) WO2021047922A1 (fr)

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CN114872432B (zh) * 2022-04-22 2022-11-29 浙江长恒包装有限公司 一种自动化热压转印及覆膜一体设备
CN218841178U (zh) * 2022-06-15 2023-04-11 上海睿途新材料科技有限公司 一种冷烫膜输送装置

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JPH1071648A (ja) 1996-08-30 1998-03-17 Nisca Corp 情報記録媒体のオーバーコート装置
WO1999032291A1 (fr) 1997-12-23 1999-07-01 Datacard Corporation Commande pour section de transfert d'image d'une imprimante de carte
US20080022875A1 (en) 2006-07-25 2008-01-31 Ryobi Ltd. Sheet-fed printing press
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CN105856819A (zh) 2016-04-25 2016-08-17 万军霞 一种全自动丝网冷烫印机

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JP2022547924A (ja) 2022-11-16
EP4028261C0 (fr) 2023-12-06
EP4028261A1 (fr) 2022-07-20

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