WO2017207006A1 - Système de broche pour le montage et le démontage faciles de plaques d'impression - Google Patents

Système de broche pour le montage et le démontage faciles de plaques d'impression Download PDF

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Publication number
WO2017207006A1
WO2017207006A1 PCT/DK2017/050178 DK2017050178W WO2017207006A1 WO 2017207006 A1 WO2017207006 A1 WO 2017207006A1 DK 2017050178 W DK2017050178 W DK 2017050178W WO 2017207006 A1 WO2017207006 A1 WO 2017207006A1
Authority
WO
WIPO (PCT)
Prior art keywords
pin
bar
plate
pin bar
printing plates
Prior art date
Application number
PCT/DK2017/050178
Other languages
English (en)
Inventor
Soeren Joergensen
Kristian KVISTGAARD
Peter Jensen
Original Assignee
Glunz & Jensen
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 Glunz & Jensen filed Critical Glunz & Jensen
Publication of WO2017207006A1 publication Critical patent/WO2017207006A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/005—Attaching and registering printing formes to supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1262—Devices for attaching printing elements or formes to supports for attaching flexible printing formes without tensioning means

Definitions

  • the present invention relates generally to printing, and specifically to a pin bar to aid the loading and unloading of flexographic plates.
  • Flexographic plates are typically photopolymer plates that are pre-sensitized with a coating such as a Laser Ablation Mask System (LAMS) coating that is ablated by a laser in an imager during imaging.
  • LAMS Laser Ablation Mask System
  • the LAMS layer is typically highly sensitive and vulnerable before and after imaging, so that scratches may destroy the flexographic plate and make it unusable.
  • the production of flexographic printing plates from the photopolymerizable, imageable flexographic printing is performed using a multi-step process using appropriate devices for each process step.
  • a mask is written into the imageable layer.
  • the flexographic printing is then exposed to UV radiation.
  • the photopolymerizable layer is polymerized in the areas not covered by a mask while in the areas covered no polymerization occurs.
  • the remnants of the mask and the unpolymerized parts of the photopolymerizable layer are removed. This can be done using one or more solvents or thermally. When using solvents for developing the plate a drying step is typically needed.
  • the surface of the obtained flexographic printing plate is post-treated after drying, for example by exposing the surface with UVA and/or UVC radiation.
  • corresponding exposure apparatuses are used.
  • the devices for carrying out the respective steps normally required human intervention. After carrying out process step the processed flexographic printing element of the device has to be manually taken out and fed to the respective subsequent process step. Because of repeated manual intervention the production of flexographic printing plates is expensive. In order to obtain the desired relief characters, the plate is only polymerized at the points of a mask left permeable to the light.
  • a negative film plate is applied to the plate, which indeed shows the image to be printed in negative
  • the plate itself is covered by a layer that is abraded by laser engraving to create the negative of the image to be printed.
  • the exposure of the plate to light causes the polymerization of only those parts of the plate at the points of the negative film that are permeable to the light, in the case of an analogue printing plate, or at the points in which the layer of coating material has been removed in the case of a digital printing plate, thus forming the image to be printed in relief on the polymer.
  • the plate must be exposed to ultraviolet (UV) light for the necessary formation of the base ("back" exposure, i.e. of the bottom or back of the plate).
  • UV ultraviolet
  • the main exposure (i.e. of the main side of the plate) and back exposure steps take place in separate steps of the printing plate treatment process.
  • the flexographic plate undergoes other processing steps, among which the washing step, thanks to which the unpolymerized material is removed from the plate.
  • the washing step is performed successively to the exposure step of the plate and using a special washing module.
  • the operator must therefore manually move the printing plate from the exposure module to the washing module, by in general removing the plate from the exposure module and repositioning it at the entrance to the washing module.
  • the washing of the plate can be performed by means of various known techniques, by means of solvent that penetrates and dissolves the non-photopolymerized polymer or by means of water that detaches, does not dissolve, the non-photopolymerized polymer, and subsequent removal of the non- photopolymerized by means of brushes.
  • a known method of transportation through a processing unit is by use of a chain driven pin-bar system. In this method, a hole is punched at the very edge of the plate and the plate is placed onto a pin-bar wherein the pins will correspond correctly to the previously punched hole. The pin-bar is then locked in to position on the chain drive, which is in continuous motion on the right and left hand side down the length of the machine. The pin-bar is thus pulled into the processor and the plate follows the path of the pin-bar.
  • the term "pin bar" is known to those skilled in the art, and hence does not require further explanation.
  • US5361698 discloses a pin bar for flexographic printing plates, wherein the bar is provided with a plurality of protrusions for clamping a flexographic plate to the pin bar.
  • the protrusions are arranged along the length of the bar.
  • the present invention provides a pin bar for improved loading and unloading of flexographic plates to and from a processing unit.
  • the present invention provides a pin bar (1 ) for a processing unit for producing flexographic printing plates, wherein the bar is provided with a plurality of protrusions for clamping a flexographic plate to the pin bar, said protrusions arranged orthogonally along the length of the bar and each of said protrusions being configured as a pin with a rounded upper part (3) and with a cylindrical stem (2) having a cavity or groove (4) on at least one side of the pin.
  • the cavity or groove (4) is at the base of the pin. It is preferred that the pins have a height of between 5 to 15 mm.
  • the height of the cavity or groove (4) is preferably between 0.5 and 2 mm, while the height of the rounded upper part (3) preferably is between 0.5 and 2 mm.
  • the height of the cylindrical stem (2) is preferably between 5 and 10 mm.
  • FIG. 2 shows an enlarged cross-sectional view of a pin.
  • a pin bar (1) for a processing unit for producing flexographic printing plates wherein the bar is provided with a plurality of protrusions for clamping a flexographic plate to the pin bar, said protrusions arranged orthogonally along the length of the bar and each of said protrusions being configured as a pin with a rounded upper part (3) and with a cylindrical stem (2) having a cavity or groove (4) on at least one side of the pin.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)

Abstract

La présente invention concerne une barre à broches permettant de maintenir des plaques d'impression flexographique. La barre comporte un ensemble de broches permettant de serrer une plaque flexographique sur la barre à broches. Les broches sont disposées orthogonalement sur la longueur de la barre et chacune des broches présente une partie supérieure arrondie et une tige cylindrique présentant une cavité ou une rainure sur au moins un côté de la broche.
PCT/DK2017/050178 2016-05-31 2017-05-31 Système de broche pour le montage et le démontage faciles de plaques d'impression WO2017207006A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201670385 2016-05-31
DKPA201670385 2016-05-31

Publications (1)

Publication Number Publication Date
WO2017207006A1 true WO2017207006A1 (fr) 2017-12-07

Family

ID=60477998

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2017/050178 WO2017207006A1 (fr) 2016-05-31 2017-05-31 Système de broche pour le montage et le démontage faciles de plaques d'impression

Country Status (1)

Country Link
WO (1) WO2017207006A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020208145A1 (fr) * 2019-04-11 2020-10-15 Xeikon Prepress N.V. Appareil et procédé de traitement d'un précurseur de plaque d'impression en relief avec un liquide

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4809609A (en) * 1984-09-19 1989-03-07 Sakata Shokai, Ltd. Method of directly mounting a printing plate on plate cylinder and the plate cylinder and register pins used in said method
WO1991001885A1 (fr) * 1989-07-26 1991-02-21 Tecflex Limited Barres de reperage
US5361698A (en) * 1992-02-21 1994-11-08 Man Roland Druckmaschinen Ag Device for clamping a printing plate onto a plate cylinder
JPH07287402A (ja) * 1994-04-15 1995-10-31 Mitsubishi Paper Mills Ltd 製版用ピンバー
US5562039A (en) * 1995-09-05 1996-10-08 E. I. Du Pont De Nemours And Company Method for mounting a flexible printing plate onto a printing cylinder
CA2924672A1 (fr) * 2013-09-30 2015-04-02 Flint Group Germany Gmbh Dispositif et procede de fabrication de cliches flexographiques en ligne

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4809609A (en) * 1984-09-19 1989-03-07 Sakata Shokai, Ltd. Method of directly mounting a printing plate on plate cylinder and the plate cylinder and register pins used in said method
WO1991001885A1 (fr) * 1989-07-26 1991-02-21 Tecflex Limited Barres de reperage
US5361698A (en) * 1992-02-21 1994-11-08 Man Roland Druckmaschinen Ag Device for clamping a printing plate onto a plate cylinder
JPH07287402A (ja) * 1994-04-15 1995-10-31 Mitsubishi Paper Mills Ltd 製版用ピンバー
US5562039A (en) * 1995-09-05 1996-10-08 E. I. Du Pont De Nemours And Company Method for mounting a flexible printing plate onto a printing cylinder
CA2924672A1 (fr) * 2013-09-30 2015-04-02 Flint Group Germany Gmbh Dispositif et procede de fabrication de cliches flexographiques en ligne

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020208145A1 (fr) * 2019-04-11 2020-10-15 Xeikon Prepress N.V. Appareil et procédé de traitement d'un précurseur de plaque d'impression en relief avec un liquide
NL2022926B1 (en) * 2019-04-11 2020-10-20 Xeikon Prepress Nv Apparatus and method for treating a relief precursor with liquid

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