WO1997049559A1 - Procede de poudrage de la surface imprimee d'une matiere imprimee - Google Patents

Procede de poudrage de la surface imprimee d'une matiere imprimee Download PDF

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Publication number
WO1997049559A1
WO1997049559A1 PCT/EP1997/003272 EP9703272W WO9749559A1 WO 1997049559 A1 WO1997049559 A1 WO 1997049559A1 EP 9703272 W EP9703272 W EP 9703272W WO 9749559 A1 WO9749559 A1 WO 9749559A1
Authority
WO
WIPO (PCT)
Prior art keywords
powder particles
powder
gas stream
nozzle
powdering
Prior art date
Application number
PCT/EP1997/003272
Other languages
German (de)
English (en)
Inventor
Frank Gunschera
Sven Kerpe
Christian Hieb
Original Assignee
Heidelberger Druckmaschinen Aktiengesellschaft
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 Heidelberger Druckmaschinen Aktiengesellschaft filed Critical Heidelberger Druckmaschinen Aktiengesellschaft
Priority to JP10502330A priority Critical patent/JP2000512575A/ja
Publication of WO1997049559A1 publication Critical patent/WO1997049559A1/fr

Links

Classifications

    • 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
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/06—Powdering devices, e.g. for preventing set-off

Definitions

  • the invention relates to a method for pempering a printed surface of a printing material.
  • Known powder devices contain a source of compressed air that generates an air flow. Powder particles are brought into the air flow, which are accelerated and directed towards the printed surface. If such a powder device is used at the exit of a sheet-fed printing machine, then the powder particles are deflected on their way to the surface by transverse flows. Such cross currents arise. a. by moving parts or by blowing air or suction devices that are intended for the sheet guide.
  • the object of the invention is to improve the uniformity of the powder application with little effort, the influence of the gas flow used in the Pudem on the run of the printing material is as small as possible, and an undesirable powder deposit is largely avoided.
  • the separation of the powder particles from the gas stream to be carried out according to the invention takes advantage of the inertia of the powder particles, which essentially maintain their direction after their acceleration.
  • the powder particles On the way to the printed surface of the printing material, the powder particles have such a high kinetic energy that they reach the surface of the printing material largely unaffected by cross-air currents. Powder particles with very low mass and energy, which do not reach the surface of the sheet, are carried in the deflected air stream 5 and can be separated if necessary.
  • FIG. 1 is a diagram of a powder device with a curved air duct
  • FIG. 2 shows a diagram of a powder device with an outlet opening that extends across the width of the printing material
  • 3 is a diagram of a powder nozzle
  • the powder device shown in FIG. 1 contains a compressor 1 for air in a channel 2.
  • a tube 4 opens into the channel, which is connected to a metering device 5 and a container 6 for powder particles 3.
  • the channel 2 is formed in a straight line over an acceleration path 7.
  • a separating wall 9 and an outlet opening 10 are provided in the area of the curvature 8.
  • a sheet 11 is conveyed past at the speed v.
  • a suction channel 12 is arranged, which has a further curvature 13 with a further separating wall 14 and an outlet opening 15.
  • a channel 16, which is connected to the container 6, is connected to the outlet opening 15.
  • the suction channel 12 opens into a container 17 for powder particles 3, a fan 18 with a filter 19 installed upstream being installed on the container 17.
  • the powder device is designed so that the outlet opening 10 can be effective across the width of the sheet 11.
  • the process for the Pudem can be carried out with the device described above as follows:
  • the powder particles 3 brought into the channel 2 are accelerated to a high speed.
  • the powder particles 3 In the area shortly before the curvature 8, the powder particles 3 have almost the speed of the flow generated by the compressor 1 in the channel 2.
  • the time and the amount of powder particles 3 fed into the channel 2 result from the position of the sheet 11 relative to the outlet opening 10 and from the layer thickness and the distribution of the printing ink applied to the sheet 11.
  • the mixture of powder particles 3 and air is segregated in the area of the separating wall 9. Powder particles 3 with a large mass slide due to their inertia impulse O 97/49559 PC17EP97 / 03272
  • Powder particles 3 of low mass remain in the air flow and reach the suction channel 12.
  • Powder particles 3 with a still usable weight are returned to the container 6 via the channel 16.
  • Powder particles 3, the weight of which is not sufficient to reach the surface of the sheet 11 in the presence of transverse flows, are collected in the container 17.
  • the blower 18 maintains the air pressure required in the system.
  • the filter 19 prevents the finest powder particles 3 from escaping.
  • the method makes it possible that almost no stray powder particles 3 can occur, which can cause undesirable contamination, for example in the delivery of the sheet-fed printing machine.
  • a cylindrical container 20 is provided, in the interior of which there is a mixing chamber 21 with an agitator 22.
  • An outlet channel 23 is provided tangentially on the container 20 over the width of the sheet 11.
  • a homogeneous mixture of powder particles 3 and air is generated in the mixing chamber 21 with the aid of the agitator 22.
  • the input device for powder particles 3 into the mixing chamber 21 is not shown in FIG. 2.
  • the mixing chamber 21 is connected to a compressed air system 24.
  • the cross-sectional area of the outlet channel 23 is dimensioned such that a high flow velocity in the outlet channel 23 is achieved by the internal pressure in the mixing chamber 21.
  • the outlet channel 23 is formed at its end facing the bend 11 in such a way that the air flow expands extremely due to the impact on the ambient air at rest, while the powder particles 3 are only slightly deflected due to their inertia pulse.
  • the desired amount of powder applied can be set via the concentration of the powder particles 3 in the powder air mixture in the container 20.
  • the time for the beginning of the Order of the powder particles 3 and the duration of the order can be controllable if, for. B. above the outlet channel 23 adjustable flaps are provided.
  • FIG. 3 shows a particularly advantageous embodiment for a nozzle of a powder device, which can in principle be provided as an outlet channel 23 (FIG. 2).
  • the nozzle contains an acceleration section 25 for accelerating the powder particles 3.
  • the flow velocity of the air is increased within the acceleration section 25.
  • the powder particles 3 carried in the air flow, including the powder particles 3 with large mass, almost reach the speed of the air flow at the exit of the acceleration section 25.
  • FIGS. 4 and 5 show possible designs for outlet openings 28, 29 of the nozzle shown in FIG. 3.
  • FIG. 6 schematically shows a vector representation of the speed of the powder particles 3.
  • the influence of the air flow present at the exit of the separation section 26 on the course of the bends 11 is slight because the speed of the air flow does not have to be excessively high due to the provision of a longer acceleration section 25 and the rapid expansion in the separation section 26 and because the air flow behind Exit from the nozzle is not preferably directed towards the arc.
  • This also has the advantage that the powder particles 3 are not blown from the surface of the sheet 11 by the high flow velocity of the air.
  • the pressure conditions are similar Nozzle entry in front of the acceleration path 25 increases the speed of the powder particles 3 according to the invention, which can lead to an increase in the efficiency of the compressed gas system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Coating Apparatus (AREA)

Abstract

L'invention concerne un procédé de poudrage de la surface imprimée d'une matière imprimée. L'invention vise à améliorer l'uniformité de l'application de poudre, de manière simple, l'influence du courant gazeux utilisé lors du poudrage devant être aussi réduite que possible sur le déplacement de la matière imprimée et un dépôt indésirable de la poudre devant être évité dans une large mesure. Selon ce procédé de poudrage de la surface imprimée d'une matière imprimée, les particules de poudre sont appliquées à l'aide d'un courant gazeux sur la surface déplacée par rapport à un dispositif de poudrage, les particules de poudre étant accélérées, puis séparées (3) du courant gazeux, ledit courant gazeux étant dévié par rapport au sens de mouvement des particules de poudre (3). Cette invention s'applique dans des machines à imprimer.
PCT/EP1997/003272 1996-06-24 1997-06-23 Procede de poudrage de la surface imprimee d'une matiere imprimee WO1997049559A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10502330A JP2000512575A (ja) 1996-06-24 1997-06-23 被印刷物の印刷された表面へのパウダー塗布のための方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996125099 DE19625099A1 (de) 1996-06-24 1996-06-24 Verfahren zum Pudern einer bedruckten Oberfläche eines Bedruckstoffes
DE19625099.4 1996-06-24

Publications (1)

Publication Number Publication Date
WO1997049559A1 true WO1997049559A1 (fr) 1997-12-31

Family

ID=7797770

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/003272 WO1997049559A1 (fr) 1996-06-24 1997-06-23 Procede de poudrage de la surface imprimee d'une matiere imprimee

Country Status (3)

Country Link
JP (1) JP2000512575A (fr)
DE (1) DE19625099A1 (fr)
WO (1) WO1997049559A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19751383B4 (de) 1997-11-20 2004-12-09 Weitmann & Konrad Gmbh & Co Kg Verfahren und Vorrichtung zum Aufbringen von Puder auf bewegte Druckbogen
DE29805248U1 (de) * 1998-03-24 1998-05-20 Roland Man Druckmasch Bestäubungseinrichtung in einer Druckmaschine
DE102005055111A1 (de) * 2005-11-18 2007-05-24 Man Roland Druckmaschinen Ag Vorrichtung und Verfahren zum Bepudern bzw. Bestäuben von Bedruckstoffen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1566800A (en) * 1924-04-21 1925-12-22 Charles Eneu Johnson And Compa Device for offset prevention and surface finishing in printing
US1659179A (en) * 1926-06-04 1928-02-14 B L Nicholes & Co Inc Powder-distributing machine
FR2277049A1 (fr) * 1974-07-02 1976-01-30 Saint Gobain Appareil pour la realisation d'un film d'oxyde metallique sur une surface de verre

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7902264U1 (de) * 1979-01-27 1979-05-17 Walter Hofmann, Maschinenfabrik, 2084 Rellingen Spritzpistole zum aufbringen von koernigem material auf flaechen, vorzugsweise von glasperlen auf fahrbahnmarkierungen o.dgl.
CA1188935A (fr) * 1982-05-03 1985-06-18 Erhard Kock Methode et dispositif de peinturage a la poudre
DE3611577A1 (de) * 1986-04-07 1987-10-15 Wagner Int Elektrostatische pulver-spruehpistole
DE3743864A1 (de) * 1987-12-23 1989-07-06 Praezisions Werkzeuge Ag Verfahren zur reduzierung von umgebungseinfluessen auf die pulverbeschichtung eines werkstueckes und pulverbeschichtungsanlage
DE3819203A1 (de) * 1988-06-06 1989-12-07 Klaschka Ind Elektronik Bestaeubungsgeraet
DE29517283U1 (de) * 1995-11-02 1995-12-14 Heidelberger Druckmasch Ag Puderdusche

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1566800A (en) * 1924-04-21 1925-12-22 Charles Eneu Johnson And Compa Device for offset prevention and surface finishing in printing
US1659179A (en) * 1926-06-04 1928-02-14 B L Nicholes & Co Inc Powder-distributing machine
FR2277049A1 (fr) * 1974-07-02 1976-01-30 Saint Gobain Appareil pour la realisation d'un film d'oxyde metallique sur une surface de verre

Also Published As

Publication number Publication date
DE19625099A1 (de) 1998-01-02
JP2000512575A (ja) 2000-09-26

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