EP1155824A2 - A spray dampening apparatus - Google Patents
A spray dampening apparatus Download PDFInfo
- 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
Links
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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)
- Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
Description
- 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.)
- 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.
- 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.
- 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.
- A spray dampening apparatus 1 of a generally conventional design is mounted in the vicinity of a
printing press roller 2. It comprises aspray beam 3 in a longitudinal spray casing 4.Spray nozzles 5, preferably for spraying fountain solution, are arranged in thespray beam 3. They are preferably evenly distributed for obtaining an even spray pattern on theroller 2 fromspray cones 6 emanating from thenozzles 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 theroller 2, so that only a small circumferential gap appears between theroller 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 thespray 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 slittedair tubes 8 one at each side of the row ofspray 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 thespray 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 theair tubes 8 close to the row ofspray nozzles 5 and to direct the air streams along the borders of thespray 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)
- 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.
- 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).
- A device according to claim 2, characterized in that said means is a slitted air tube (8).
- A device according to claim 2, characterized in that said means are air nozzles.
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)
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)
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 |
Citations (3)
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 |
US5299495A (en) * | 1991-07-27 | 1994-04-05 | Koenig & Bauer Aktiengesellschaft | Cylinder moistening assembly |
WO1997027052A2 (en) * | 1996-01-24 | 1997-07-31 | Koenig & Bauer-Albert Ag | Spray moistener |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
JPH06198860A (en) * | 1992-12-28 | 1994-07-19 | Sakurai Graphic Syst:Kk | Ink cleaner of printing press |
-
2000
- 2000-05-17 SE SE0001822A patent/SE516747C2/en not_active IP Right Cessation
-
2001
- 2001-05-11 DE DE60131801T patent/DE60131801T2/en not_active Expired - Lifetime
- 2001-05-11 EP EP01111484A patent/EP1155824B1/en not_active Expired - Lifetime
- 2001-05-14 WO PCT/SE2001/001040 patent/WO2001087603A1/en active Search and Examination
Patent Citations (3)
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 |
US5299495A (en) * | 1991-07-27 | 1994-04-05 | Koenig & Bauer Aktiengesellschaft | Cylinder moistening assembly |
WO1997027052A2 (en) * | 1996-01-24 | 1997-07-31 | Koenig & Bauer-Albert Ag | Spray moistener |
Cited By (4)
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 |
---|---|
WO2001087603A1 (en) | 2001-11-22 |
SE0001822D0 (en) | 2000-05-17 |
DE60131801D1 (en) | 2008-01-24 |
EP1155824A3 (en) | 2003-03-05 |
SE516747C2 (en) | 2002-02-26 |
DE60131801T2 (en) | 2009-01-29 |
SE0001822L (en) | 2001-11-18 |
EP1155824B1 (en) | 2007-12-12 |
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