EP1155824A2 - A spray dampening apparatus - Google Patents

A spray dampening apparatus Download PDF

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Publication number
EP1155824A2
EP1155824A2 EP01111484A EP01111484A EP1155824A2 EP 1155824 A2 EP1155824 A2 EP 1155824A2 EP 01111484 A EP01111484 A EP 01111484A EP 01111484 A EP01111484 A EP 01111484A EP 1155824 A2 EP1155824 A2 EP 1155824A2
Authority
EP
European Patent Office
Prior art keywords
spray
printing press
air
nozzles
press roller
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.)
Granted
Application number
EP01111484A
Other languages
German (de)
French (fr)
Other versions
EP1155824B1 (en
EP1155824A3 (en
Inventor
Birger Hansson
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.)
Baldwin Jimek AB
Original Assignee
Baldwin Jimek AB
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 Baldwin Jimek AB filed Critical Baldwin Jimek AB
Publication of EP1155824A2 publication Critical patent/EP1155824A2/en
Publication of EP1155824A3 publication Critical patent/EP1155824A3/en
Application granted granted Critical
Publication of EP1155824B1 publication Critical patent/EP1155824B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B41F7/30—Damping devices using spraying elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices

Definitions

  • the present invention relates to a method and device for preventing clogging of spray nozzles and/or a screening plate of a spray dampening apparatus arranged at a printing press roller.
  • a spray dampening apparatus is arranged in the proximity of a printing press roller for spraying fountain solution thereon.
  • This fountain solution is needed for obtaining the intended printing function in the printing press, as is well known in the art. (Other liquids than fountain solution could alternatively be sprayed.)
  • the printing ink mist causes clogging of the spray nozzles of the spray dampening apparatus, so that their intended spray function gradually deteriorates and the spray pattern of the spray dampening apparatus is changed.
  • a screening plate is provided in a spray casing in front of the spray nozzles.
  • the screening plate is provided with openings for letting through to the printing press roller only a portion of the fountain solution sprayed by the spray nozzles. These screening plate openings may be clogged by the entering printing ink mist, so that the screening function of the screening plate is changed in a non-predictable way.
  • This clogging may according to the invention be prevented in that streams of clean air are caused to flow towards the printing press roller along the spray cones from the spray nozzles in order to break up approaching, dirty air streams.
  • a slitted air tube for emitting an air stream towards the printing press roller is arranged at each side of the spray nozzles.
  • a spray dampening apparatus 1 of a generally conventional design is mounted in the vicinity of a printing press roller 2. It comprises a spray beam 3 in a longitudinal spray casing 4. Spray nozzles 5, preferably for spraying fountain solution, are arranged in the spray beam 3. They are preferably evenly distributed for obtaining an even spray pattern on the roller 2 from spray cones 6 emanating from the nozzles 5.
  • the spray casing 4 is generally closed except at its side facing the roller 2. As shown, the side walls of the spray casing 4 are curved in correspondence to the curvature of the roller 2, so that only a small circumferential gap appears between the roller 2 and the spray casing 4.
  • the environment in a printing press is comparatively harsh with for example a mist of printing ink and possibly other matters being formed in the region where the roller is situated.
  • the mist can enter into the spray casing 4 through said gap, as is illustrated by arrows 7.
  • this mist causes problems with clogging of the interior of the spray casing 4, especially the spray nozzles 5 with a gradually deteriorating operation thereof as result.
  • the arrangement comprises two longitudinal slitted air tubes 8 one at each side of the row of spray nozzles 5. These slitted tubes direct air streams 8' obliquely forwards in the spray casing 4. The purpose of these air streams 8' is to prevent the intrusion of the printing ink mist into the spray casing 4 and to create an overpressure therein.
  • a screening plate 9 provided with openings for letting through only a certain portion of the fountain solution from the spray nozzles 5 may be arranged in the spray casing 4.
  • the screening plate openings are gradually cloggged by the printing ink mist, which may be prevented by the air streams 8'.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)

Abstract

Spray nozzles (5) and/or a screening plate (9) in a spray casing (4) of a spray dampening apparatus arranged at a printing press roller (2) may be clogged by printing ink mist entering the spray casing. In order to obviate this, an air stream (8') from a slitted air tube (8) is caused to flow towards the printing press roller (2) in the spray casing (4).

Description

Field of the Invention
The present invention relates to a method and device for preventing clogging of spray nozzles and/or a screening plate of a spray dampening apparatus arranged at a printing press roller.
Technical Background
A spray dampening apparatus is arranged in the proximity of a printing press roller for spraying fountain solution thereon. This fountain solution is needed for obtaining the intended printing function in the printing press, as is well known in the art. (Other liquids than fountain solution could alternatively be sprayed.)
It is also well known in the art that at the high speed rotation of the different rollers in the printing press, it is difficult to obviate the formation of a mist of printing ink and other matters in and around the press. This printing ink mist causes certain problems in the operation of the press.
The printing ink mist causes clogging of the spray nozzles of the spray dampening apparatus, so that their intended spray function gradually deteriorates and the spray pattern of the spray dampening apparatus is changed.
In a special design of the spray dampening apparatus a screening plate is provided in a spray casing in front of the spray nozzles. The screening plate is provided with openings for letting through to the printing press roller only a portion of the fountain solution sprayed by the spray nozzles. These screening plate openings may be clogged by the entering printing ink mist, so that the screening function of the screening plate is changed in a non-predictable way.
The Invention
This clogging may according to the invention be prevented in that streams of clean air are caused to flow towards the printing press roller along the spray cones from the spray nozzles in order to break up approaching, dirty air streams.
In a device for carrying out the invention a slitted air tube for emitting an air stream towards the printing press roller is arranged at each side of the spray nozzles.
Brief Description of the Drawing
The invention will be further described below under reference to the accompanying drawing illustrating a spray dampening apparatus according to the invention at a printing press roller in a sectional and schematic side view.
Detailed Description of Embodiments
A spray dampening apparatus 1 of a generally conventional design is mounted in the vicinity of a printing press roller 2. It comprises a spray beam 3 in a longitudinal spray casing 4. Spray nozzles 5, preferably for spraying fountain solution, are arranged in the spray beam 3. They are preferably evenly distributed for obtaining an even spray pattern on the roller 2 from spray cones 6 emanating from the nozzles 5.
The spray casing 4 is generally closed except at its side facing the roller 2. As shown, the side walls of the spray casing 4 are curved in correspondence to the curvature of the roller 2, so that only a small circumferential gap appears between the roller 2 and the spray casing 4.
The environment in a printing press is comparatively harsh with for example a mist of printing ink and possibly other matters being formed in the region where the roller is situated.
The mist can enter into the spray casing 4 through said gap, as is illustrated by arrows 7. Conventionally, this mist causes problems with clogging of the interior of the spray casing 4, especially the spray nozzles 5 with a gradually deteriorating operation thereof as result.
In order to obviate this problem, there is shown an arrangement creating an air stream towards the roller 2 in the spray casing 4. In the shown case the arrangement comprises two longitudinal slitted air tubes 8 one at each side of the row of spray nozzles 5. These slitted tubes direct air streams 8' obliquely forwards in the spray casing 4. The purpose of these air streams 8' is to prevent the intrusion of the printing ink mist into the spray casing 4 and to create an overpressure therein.
As a special case and as shown in the drawing, a screening plate 9 provided with openings for letting through only a certain portion of the fountain solution from the spray nozzles 5 may be arranged in the spray casing 4. The screening plate openings are gradually cloggged by the printing ink mist, which may be prevented by the air streams 8'.
It is an increased tendency in the art to use a spray dampening apparatus without a spray casing and with the spray nozzles arranged as hitherto on a spray beam. The discussed problem with clogged spray nozzles may also appear at such a construction. In order to obviate this problem by air streams according to the invention, it is of importance to position the slitted air tubes 8 at the spray nozzles in an optimal way. It appears advantageous to place the air tubes 8 close to the row of spray nozzles 5 and to direct the air streams along the borders of the spray cones 6 from the nozzles.
As an alternative to emitting the air streams from slitted air tubes 8, it is possible to make use of air nozzles.

Claims (4)

  1. A method for preventing clogging of spray nozzles (5) and/or a screening plate (9) of a spray dampening apparatus (1) arranged at a printing press roller (2), characterized in that streams (8') of clean air are caused to flow towards the printing press roller (2) along the spray cones (6) from the spray nozzles (5) in order to break up approaching, dirty air streams.
  2. A device for carrying out the method of claim 1, characterized in that means (8) for emitting an air stream (8') towards the printing press roller (2) are arranged at each side of the spray nozzles (5).
  3. A device according to claim 2, characterized in that said means is a slitted air tube (8).
  4. A device according to claim 2, characterized in that said means are air nozzles.
EP01111484A 2000-05-17 2001-05-11 A spray dampening apparatus Expired - Lifetime EP1155824B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0001822 2000-05-17
SE0001822A SE516747C2 (en) 2000-05-17 2000-05-17 Method and Device to Prevent Clogging of Spray Nozzles and / or a Shielding Plate of a Spray Moisturizer

Publications (3)

Publication Number Publication Date
EP1155824A2 true EP1155824A2 (en) 2001-11-21
EP1155824A3 EP1155824A3 (en) 2003-03-05
EP1155824B1 EP1155824B1 (en) 2007-12-12

Family

ID=20279707

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01111484A Expired - Lifetime EP1155824B1 (en) 2000-05-17 2001-05-11 A spray dampening apparatus

Country Status (4)

Country Link
EP (1) EP1155824B1 (en)
DE (1) DE60131801T2 (en)
SE (1) SE516747C2 (en)
WO (1) WO2001087603A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006014990B4 (en) * 2006-03-31 2008-08-07 Technotrans Ag Spray dampening unit for printing machines and method for cleaning the at least one nozzle of a spray dampening unit
EP1972442A1 (en) 2007-03-21 2008-09-24 technotrans AG Method and device for cleaning nozzles on a spray dampening unit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE524552C2 (en) * 2002-05-17 2004-08-24 Baldwin Jimek Ab Method and apparatus for keeping a plurality of spray nozzles in a pressurized spray boom clean
DE102018209539A1 (en) * 2018-06-14 2019-04-04 Heidelberger Druckmaschinen Ag Moistening device in a printing machine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4241656A (en) * 1978-11-17 1980-12-30 Smith R. P. M. Corporation Self-cleaning nozzle for lithographic printing dampeners
US4569484A (en) * 1984-08-31 1986-02-11 The United States Of America As Represented By The United States Department Of Energy Air blast type coal slurry fuel injector
US5040457A (en) * 1989-10-10 1991-08-20 Rockwell International Corporation Printing press dampener
DE4125012A1 (en) * 1991-07-27 1993-01-28 Koenig & Bauer Ag DEVICE FOR MOISTURIZING CYLINDERS IN OFFSETROTATION PRINTING MACHINES
JPH06198860A (en) * 1992-12-28 1994-07-19 Sakurai Graphic Syst:Kk Ink cleaner of printing press
EP0956949A3 (en) * 1996-01-24 1999-12-29 Koenig & Bauer Aktiengesellschaft Spray moistener

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006014990B4 (en) * 2006-03-31 2008-08-07 Technotrans Ag Spray dampening unit for printing machines and method for cleaning the at least one nozzle of a spray dampening unit
EP1972442A1 (en) 2007-03-21 2008-09-24 technotrans AG Method and device for cleaning nozzles on a spray dampening unit
DE102007013590A1 (en) 2007-03-21 2008-09-25 Technotrans Ag Method and device for cleaning nozzles on a spray dampening unit
US8001889B2 (en) 2007-03-21 2011-08-23 Technotrans Ag Procedure and device for preventing contamination of the nozzles of a spray dampening unit

Also Published As

Publication number Publication date
DE60131801D1 (en) 2008-01-24
EP1155824B1 (en) 2007-12-12
WO2001087603A1 (en) 2001-11-22
SE0001822L (en) 2001-11-18
DE60131801T2 (en) 2009-01-29
SE516747C2 (en) 2002-02-26
SE0001822D0 (en) 2000-05-17
EP1155824A3 (en) 2003-03-05

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