EP2011653A2 - Washing device for a cylinder in a printing machine - Google Patents
Washing device for a cylinder in a printing machine Download PDFInfo
- Publication number
- EP2011653A2 EP2011653A2 EP08104533A EP08104533A EP2011653A2 EP 2011653 A2 EP2011653 A2 EP 2011653A2 EP 08104533 A EP08104533 A EP 08104533A EP 08104533 A EP08104533 A EP 08104533A EP 2011653 A2 EP2011653 A2 EP 2011653A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- washing
- washing device
- cylinder
- liquid
- ultrasonic
- 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
- 238000005406 washing Methods 0.000 title claims abstract description 100
- 238000007639 printing Methods 0.000 title claims description 12
- 239000004744 fabric Substances 0.000 claims abstract description 37
- 239000004033 plastic Substances 0.000 claims abstract description 25
- 229920003023 plastic Polymers 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 9
- 239000012528 membrane Substances 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 229920005372 Plexiglas® Polymers 0.000 claims description 2
- -1 Polyethylene Polymers 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 claims 1
- 239000000835 fiber Substances 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 229920002223 polystyrene Polymers 0.000 claims 1
- 239000012141 concentrate Substances 0.000 abstract description 2
- 239000000356 contaminant Substances 0.000 abstract 1
- 238000002604 ultrasonography Methods 0.000 description 20
- 238000003825 pressing Methods 0.000 description 12
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000007645 offset printing Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000110 cooling liquid Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 210000003746 feather Anatomy 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 206010021703 Indifference Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F35/00—Cleaning arrangements or devices
-
- 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
- B41P2235/14—Cleaning characterised by the methods or devices using ultrasonic energy
-
- 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
- B41P2235/20—Wiping devices
- B41P2235/24—Wiping devices using rolls of cleaning cloth
Definitions
- the invention relates to a washing device for a cylinder in a printing press with a washing cloth and an ultrasonic source, which directs sound energy to the cylinder surface.
- Such a washing device is for example from the WO 03/011599 known.
- There is an ultrasonic source is provided to assist the washing process, which is to facilitate the removal of impurities, color, etc. from the surface of the clamped on a transfer cylinder blanket in an offset printing machine.
- a cloth washing device for a digital printing machine described.
- a liquid-impregnated cleaning tape on the cylinder surface can be acted upon with an ultrasonic actuator to clean the printing image bearing cylinder.
- a washing device for the blanket cylinder of an offset printing machine which has an ultrasonic generator, but no washing cloth.
- the dissolved dirt particles are to be scraped off by rubber lips from the cylinder surface.
- JP 11-70641 describes the use of an ultrasonically vibrating washing doctor blade which is in direct mechanical contact with the rubber surface.
- devices of this type there is a risk that the sprayed liquid sprayed on the blanket in front of the doctor blade into the printing machine and there causes damage due to corrosion, etc.
- the sound energy emitted by one or more ultrasound transmitters of an ultrasound source is concentrated on a substantially line-shaped focal region extending parallel to the cylinder axis on the cylinder surface.
- an ultrasonic cylinder lens is advantageously used, which consists of a single or more cylindrical or toric acoustic lenses.
- the focusing device can also be formed by a cylindrical concave shape of the sonotrodes or ultrasonic vibrator, of course, both measures, the cylindrical sound lens and the concave shape of the sonotrodes can be combined.
- the high sound energy density generated on the cylinder or blanket surface in the substantially linear focus region then dissolves the paint or impurities from the surface, whereby the dirt or color particles are carried away by the moist washing cloth applied to the surface. It may be particularly advantageous if the washcloth continuously moves over the line-shaped focus area during the washing operation, while at the same time the cylinder is rotating at a greater surface speed in the direction of the wash cloth movement.
- the cylindrical sound lens which generates the linear focus either alone or with other tools together, to press the wash cloth against the cylinder surface to be cleaned.
- the construction becomes particularly simple when this cylindrical lens is designed as a tubular plastic part, in the interior of which the washing liquid for moistening the washing cloth or the cooling liquid for cooling the ultrasonic generator is contained.
- two or more functions namely the guiding of the washing liquid or cooling liquid, the focusing of the ultrasonic energy and the pressing of the washing cloth to the rubber or cylinder surface are fulfilled by a component.
- FIG. 9 is a schematic representation of the cylinder in the printing unit of an offset printing press in the plane perpendicular to the cylinder axes.
- PZ is like that referred plate cylinder referred to the holders on the clamping channel which is not shown rolls of an inking unit colored printing plate is attached.
- the print image on the printing plate is transferred to the rubber blanket GT when the cylinders are rotated, which is mounted on the blanket cylinder GTZ shown below.
- PB of the paper sheet is called, which is passed between the blanket cylinder GTZ and the impression cylinder GDZ while the blanket GT is printed with color.
- a blanket washing device GTW For washing the blanket, as usual in offset printing machines, a blanket washing device GTW is provided, which can be employed along the arrow P during order change after the end of the printing operation on the blanket cylinder GTZ.
- This washing device GTW usually contains a washing cloth 10, which is cyclically cycled from a supply roll 11a unwound and wound onto a second roll 11b. In between, the washing cloth 10 is pressed by a pressing element 11 against the surface of the rubber blanket GT to be cleaned.
- blanket washing devices work so that the cylinder surface to be cleaned rotates past the pressed-on wash cloth and this is repeatedly indexed several times during one revolution in order to convey the colored strip-shaped region of the washing cloth again and again in the direction of the take-up roll 11b.
- the washing device further includes a drive for the movement of the washing cloth and a device for the supply of washing liquid, unless already the supply roll 11 a is soaked with washing liquid.
- FIG. 1 shows in more detail a first embodiment of the invention modified according to the pressing element 11 of the blanket washing device GTW in section perpendicular to the cylinder axes.
- FIG. 1 consists of the pressing member 11 of a U-shaped aluminum profile, which on the side with which the wash cloth 10 against the Blanket GT pushes, is provided with a longitudinal slot.
- an elongated sonotrode with the in FIG. 1a shown construction. It consists of two strip-shaped masses 13a and 13b, between which a piezo-ceramic layer 13c is arranged, which is vapor-deposited on both sides with metal electrons.
- the lower, the wash cloth 10 facing part 13b of the sonotrode 13 is concave on its underside 14 and focuses the radiated ultrasonic power to a narrow, substantially linear focus area on the surface of the blanket GT.
- the sonotrode 13 is pressed by springs 16 against a provided with a seal 18 seat on the inner sides of the two legs of the U-shaped profile 12.
- a seal 18 seat on the inner sides of the two legs of the U-shaped profile 12.
- strips 12a are used in the profile 12 for positional fixation.
- the rounded two U-shaped legs of the profile 12 press the wash cloth 10 against the surface of the blanket GT.
- inflow tubes 15 are provided along the profile 12, which open into channels 17, through which the washing liquid enters the space between the washing cloth 10 and the concave surface 14 of the sonotrode 13 and fills it. Due to the washing liquid, the ultrasound energy is effectively brought to the surface of the blanket GT while avoiding excessive reflections, where it can dissolve dirt and paint residues adhering to the blanket surface due to the onset of cavitation of gas bubbles formed in the liquid in the focus area.
- FIG. 2 shows an alternative second embodiment of the modified according to the invention pressing member 11 of the blanket washing device GTW.
- FIG. 2 In the embodiment according to FIG. 2 are compared to FIG. 1 identical or similar parts with a reference number higher by 10 to facilitate understanding.
- a plurality of individual sonotrodes 23 arranged one behind the other, for example, 20 pieces with a length of about 5 cm for the blanket cylinder of a printing press in the format 105 cm.
- These sonotrodes are pressed by springs 26 against the back of a concave cylindrical lens 29 made of plastic, which is inserted over the length of the aluminum profile 22 along grooves 22b in this.
- the sonotrodes 23 are secured by strips 22 a in the interior of the profile 22.
- a liquid flow limiting membrane 26 made of plastic, rubber or a porous ceramic.
- the density of the membrane is expediently adapted to the density of the washing liquid in order to avoid undesired reflections of the ultrasonic energy at the interface with the membrane 26.
- the membrane 26 limits the flow of wash fluid from the inflow tubes 25 into the washcloth 10 and ensures that no wash liquid exits when the wash is complete and the pressure in the inflow tube 25 is turned off.
- the cylindrical plastic lens 29 is made of Plexiglas. Because in this material the speed of sound is almost twice as high as in water, the plano-concave cylindrical lens acts collecting and concentrates the ultrasonic power in a very narrow line-shaped area, as indicated by the arrows.
- the length of the pressure element of the blanket washing device can be adapted to different format widths, without the need to manufacture special individual sonotrodes for the format in each case.
- a number of individual toric or cylindrical individual lenses may be provided instead of the cylindrical lens made of plastic, which are each associated with the individual sonotrodes.
- a toric formation of the individual lenses supports the uniformity of the sound propagation along the cylinder surface over the regions which are switched off by the webs.
- FIG. 3 shows a third embodiment of the modified according to the invention pressing member 11 of the blanket washing device GTW.
- the cuboid sonotrodes are replaced by ultrasonic transducers 33a, 33b Vietnamese cross-section.
- ultrasonic transducers 33a, 33b ... can be purchased inexpensively as purchased parts, because they are used in large quantities in other applications.
- the ultrasound transmitters 33a, 33b ... are not arranged in a line one behind the other, but are staggered close to one another and are alternately arranged inclined relative to one another, as in FIG FIG. 3a is clarified.
- the ultrasound transmitters respectively associated springs 36a, 36b ... push the ultrasonic transducer 33a, 33b ... on a prism bar 38 which is glued to the back of the cylindrical lens 39.
- the prism bar 38 is made of the same material as the cylindrical lens 39, so that impedance jumps, as they otherwise occur in the transition to another medium, are avoided.
- FIG. 4 shows a fourth embodiment, for the modified according to the invention pressing member 11 of the blanket washing device GTW.
- FIG. 4 In the embodiment according to FIG. 4 are also simple inexpensive cylindrical ultrasonic transducer 43 is used, but these are used in succession with their axes parallel to each other in the circular recesses of two slides 41a, 41b, as shown in the FIG. 4a are sketched.
- the array of cylindrical ultrasonic generators formed in this way is the front side into the in FIG. 4 inserted aluminum profile 42 is inserted, wherein the lower, the blanket GT facing slide 41a rests on a shoulder 42a in the interior of the profile 42 via a sealing tape 48.
- the interior of the profile 42 is filled with oil above the part 41a, which serves to dissipate the heat generated in the ultrasonic generators 43.
- the lower, the wash cloth 10 facing side 44 of the ultrasonic generator 43 is formed cylindrically concave, as in the FIG. 4b outlined.
- the axes K of the cylindrically concave recesses of all the ultrasound transmitters 43 received one behind the other in the slides 41a, 41b are aligned in a line parallel to the axis of the blanket cylinder GTZ. In this way, the ultrasound energy radiated by the ultrasonic transmitters 43, as indicated by the arrows in FIG FIG.
- FIG. 5 shows a fifth embodiment of the modified according to the invention pressure element 11 of the blanket washing device GTW.
- the aluminum profile 42 has been replaced by a plastic profile 52.
- the profile 52 has a U-shaped cross-section and is closed like a trough on the wash cloth 10 side facing, while its two in cross-section U-shaped leg is closed on the opposite side above by a lid 57.
- the plastic profile part 52 On the outside, the plastic profile part 52 carries a plurality of ribs 51 extending over its entire length for stiffening and heat dissipation.
- the outer circular cross section of the profile 52 is flattened on the wash cloth side or adapted to the radius of the blanket GT.
- the wash cloth 10 is in the form of a concave cylindrical lens 59, which again bundles the ultrasonic energy radiated from the underside of the ultrasound generator 53 inserted in the profile before striking the blanket and focuses it in a line-shaped area of a blanket surface.
- the ultrasound transmitters 53 are the same as those after FIG. 4 , However, are placed in the plastic profile 52 with the cover 57 removed from above on strips 52a in the profile 52, wherein pins 58 in conjunction with a longitudinal groove 59 in the ultrasonic encoders act as rotation and hold the encoder 53 in place.
- the interior of the profile 52 is filled with a non-conductive liquid, which has a significantly lower density than the material of the plastic profile 52.
- the biconvex liquid rod 60 acts between the concave undersides of the ultrasonic generator and the concave inner side of the profile 52 as a cylindrical condenser lens , from which the ultrasonic power is focused on a linear area.
- the non-conductive liquid also serves to absorb the heat generated during operation of the ultrasonic generator 53, so that the transmitter 53 does not overheat.
- the washing liquid is sprayed in this embodiment by separate spray nozzles 55 next to the pressure element on the wash cloth 10.
- the washing cloth 10 moves at a slower speed during the washing past the pressing element, while at the same time the cylinder GTZ moves with the blanket GT in the opposite direction the blanket GT under the pressure element or the washing cloth 10.
- FIG. 6 shows a sixth embodiment of the modified according to the invention pressure element 11 of the blanket washing device GTW.
- the housing of the pressure element consists of a stable metal housing with H-shaped cross section, which is open at the top and bottom.
- the two legs 62a and 65b connecting cross member 62c of the profile are sealed provided on tight holes for receiving cylindrical ultrasonic encoders 63, in which they are inserted.
- the lower portion of the legs 62a and 62b tapers slightly towards the center.
- a plastic tube 69 is inserted from a material with the comparison to the washing liquid much higher density such as polyethylene. This plastic tube is flattened on both sides above and below.
- the planar undersides of the ultrasound transmitters 63 settle on the upper flattening, while the plastic tube 69 with its lower flattening settles on the washcloth 10 or is pressed against it by the springs 66 via the ultrasound transmitters 63 when the washing device has the profile 62 in FIG Direction to the blanket GT is delivered.
- tube capillaries 67 are introduced in the region of the lower flattening through which the washing liquid emerges at a corresponding pressure and wets the wash cloth 10.
- the cylindrical liquid rod of the washing liquid in conjunction with the plano-concave cylindrical lenses of the flats of the plastic tube 69 focuses the ultrasonic energy in the desired manner to a narrow line-shaped area.
- the springs 66 perform a dual function: they press the ultrasonic transducer 63 firmly on their seat and the tube member 69 of the pressure element firmly against the wash cloth 10th
- FIG. 7 shows a seventh embodiment of the modified according to the invention pressing member 11 of the blanket washing device GTW.
- FIG. 7 consists of the pressing element for the wash cloth 10 total of a thick-walled plastic tube 79 which is closed on both sides and on both sides, as from the view FIG. 7 is provided with an inlet port 78a and an outlet nozzle 78b for the washing liquid.
- the tube 79 is connected to a cooling unit, via which the resulting during the washing process heat loss is dissipated by the ultrasonic generator.
- the plastic tube 79 is made of the same material as the tube 69 FIG. 7 and also carries on its underside a flattening, which is provided with capillaries for the passage of the washing liquid.
- a metal profile 72 is inserted and is held there via two projections 71 a and 71 b in the corresponding grooves in the plastic tube 79.
- the metal profile 72 are sealed and sealed a plurality of rectangular in cross-section ultrasonic transducer 73 encapsulated, their undersides 79 as in the embodiment according to FIG. 1 are cylindrically shaped concave. Due to this concave shape, the wedge of the washing liquid 70 between the bottoms 79 of the ultrasonic emitters 73 and the concave inside of the tube 79 becomes a "thick cylinder lens" and focuses the ultrasonic waves on a line-shaped area. In this embodiment, the washing liquid 70 is also used for cooling the ultrasound generator.
Landscapes
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
Description
Die Erfindung betrifft eine Wascheinrichtung für einen Zylinder in einer Druckmaschine mit einem Waschtuch und einer Ultraschallquelle, die Schallenergie auf die Zylinderoberfläche richtet.The invention relates to a washing device for a cylinder in a printing press with a washing cloth and an ultrasonic source, which directs sound energy to the cylinder surface.
Eine derartige Wascheinrichtung ist beispielsweise aus der
In der
Die bisher in Offsetdruckmaschinen üblicherweise verwendeten so genannten Tuchwascheinrichtungen, mit denen bei einem Auftragswechsel das eingefärbte Drucktuch auf dem Übertragungszylinder gereinigt wird, besitzen üblicherweise keine Ultraschallquellen zur Waschunterstützung. Auch ohne eine derartige Unterstützung beträgt die Waschzeit ca. 2 Minuten, wobei das Gummituch innerhalb von 3 bis 4 Zylinderumdrehungen sauber gewaschen wird. Dennoch besteht der Wunsch, im Sinne eines schnellen Auftragswechsels, die Waschzeiten weiter zu verkürzen. Das war jedoch mit den im Stand der Technik beschriebenen, Ultraschall unterstützten Wascheinrichtungen nicht möglich, deren Realisierung daran gescheitert ist, dass die vorgeschlagenen Geräte einen zu hohen Leistungsbedarf besaßen. Denn um die Ultraschall-Reinigungswirkung beim einmaligen Überstreichen der Gummituchoberfläche zu erzielen, sind sehr hohe Ultraschallleistungsdichten an der eingefärbten Gummituchoberfläche erforderlich, wie man sie sonst nur aus der Materialbearbeitung kennt und die sich beispielsweise mit Schweiß-Sonotroden erzielen lassen. Herkömmliche preiswerte Schallerzeuger sind nicht in der Lage, diese erforderliche Ultraschallleistung zur Verfügung zu stellen. Sie erwärmen sich auch aufgrund des geringen Wirkungsgrades der Umwandlung von elektrischer Leistung in Schallleistung selbst sehr stark, was zur Zerstörung der Schallquellen führen kann. Deshalb haben sich die bisherigen Vorschläge zur Verbesserung der Waschleistung von Gummituchwascheinrichtungen mit Unterstützung von Ultraschall nicht durchsetzen können.The so-called cloth washing devices commonly used in offset printing machines, with which the inked blanket is cleaned on the transfer cylinder during a job change, usually do not have ultrasonic sources for washing assistance. Even without such support the washing time is approx. 2 minutes, whereby the blanket is washed clean within 3 to 4 cylinder revolutions. Nevertheless, there is a desire, in the sense of a quick order change, to further shorten the washing times. However, this was not possible with the ultrasonic assisted washing devices described in the prior art, the realization of which failed because the proposed devices had too high a power requirement. Because in order to achieve the ultrasonic cleaning effect in a single sweeping the blanket surface, very high ultrasonic power densities are required on the dyed blanket surface, as otherwise known only from the material processing and can be achieved, for example, with welding sonotrodes. Conventional inexpensive sound generators are unable to provide this required ultrasonic power. They also heat up very much due to the low efficiency of the conversion of electrical power into sound power, which can lead to the destruction of the sound sources. Therefore, the previous proposals for improving the washing performance of blanket washing facilities with the support of ultrasound have not been successful.
Aus der Ultraschalldiagnostik ist es bekannt, die Ultraschallwellen zur Erzeugung von Ultraschallbildern zu fokussieren. Derartige Anordnungen sind allerdings für Wascheinrichtungen ungeeignet.From ultrasound diagnostics, it is known to focus the ultrasound waves to produce ultrasound images. However, such arrangements are unsuitable for washing facilities.
Aus der
Es ist die Aufgabe der vorliegenden Erfindung eine Wascheinrichtung für die Zylinder von Druckmaschinen zu schaffen, mit der sich der Waschvorgang deutlich verkürzen lässt und die mit einer akzeptablen elektrischen Anschlussleistung auskommt. Diese Aufgabe mit den im Kennzeichen des Anspruchs 1 angegebenen Maßnahmen gelöst.It is the object of the present invention to provide a washing device for the cylinders of printing presses, with which the washing process can be significantly shortened and which manages with an acceptable electrical connection performance. This object is achieved with the measures specified in the characterizing part of claim 1.
Gemäß der Erfindung wird der von einem oder mehreren Ultraschallgebern einer Ultraschallquelle emittierte Schallenergie auf einen im Wesentlichen linienförmigen, sich parallel zur Zylinderachse erstreckenden Fokusbereich auf der Zylinderoberfläche konzentriert. Dazu wird vorteilhaft eine Ultraschallzylinderlinse verwendet, die aus einer einzigen oder mehreren zylindrischen oder torischen Schalllinsen besteht. Daneben kann die fokussierende Einrichtung auch durch eine zylindrische konkave Formgebung der Sonotroden bzw. Ultraschallschwinger gebildet sein, wobei natürlich beide Maßnahmen, die zylindrische Schalllinse und die konkave Formgebung der Sonotroden miteinander kombiniert werden können. Die an der Zylinder- oder Gummituchoberfläche in dem im Wesentlichen linienförmigen Fokusbereich erzeugte hohe Schallenergiedichte löst dann von der Oberfläche die Farbe bzw. Verunreinigungen, wobei die Schmutz- oder Farbpartikel von dem an der Oberfläche anliegenden feuchten Waschtuch abtransportiert werden. Hierbei kann es besonders vorteilhaft sein, wenn sich das Waschtuch während des Waschbetriebs kontinuierlich über den linienförmigen Fokusbereich hinwegbewegt, während sich gleichzeitig der Zylinder mit größerer Oberflächengeschwindigkeit entgegen oder in Richtung der Waschtuchbewegung dreht.According to the invention, the sound energy emitted by one or more ultrasound transmitters of an ultrasound source is concentrated on a substantially line-shaped focal region extending parallel to the cylinder axis on the cylinder surface. For this purpose, an ultrasonic cylinder lens is advantageously used, which consists of a single or more cylindrical or toric acoustic lenses. In addition, the focusing device can also be formed by a cylindrical concave shape of the sonotrodes or ultrasonic vibrator, of course, both measures, the cylindrical sound lens and the concave shape of the sonotrodes can be combined. The high sound energy density generated on the cylinder or blanket surface in the substantially linear focus region then dissolves the paint or impurities from the surface, whereby the dirt or color particles are carried away by the moist washing cloth applied to the surface. It may be particularly advantageous if the washcloth continuously moves over the line-shaped focus area during the washing operation, while at the same time the cylinder is rotating at a greater surface speed in the direction of the wash cloth movement.
Weiterhin ist es zweckmäßig, die zylindrische Schalllinse, die den linienförmigen Fokus entweder allein oder mit anderen Hilfsmitteln zusammen erzeugt, zu benutzen, um das Waschtuch gegen die zu reinigende Zylinderoberfläche zu drücken. Besonders einfach wird die Konstruktion dann, wenn diese Zylinderlinse als rohrförmiges Kunststoffteil ausgebildet ist, in dessen Inneren die Waschflüssigkeit zur Befeuchtung des Waschtuchs oder die Kühlflüssigkeit zur Kühlung der Ultraschallgeber enthalten ist. In diesem Falle werden durch ein Bauteil zwei oder mehr Funktionen, nämlich das Führen der Waschflüssigkeit oder Kühlflüssigkeit, das Fokussieren der Ultraschallenergie und das Andrücken des Waschtuchs an die Gummi- bzw. Zylinderoberfläche erfüllt.Furthermore, it is expedient to use the cylindrical sound lens, which generates the linear focus either alone or with other tools together, to press the wash cloth against the cylinder surface to be cleaned. The construction becomes particularly simple when this cylindrical lens is designed as a tubular plastic part, in the interior of which the washing liquid for moistening the washing cloth or the cooling liquid for cooling the ultrasonic generator is contained. In this case, two or more functions, namely the guiding of the washing liquid or cooling liquid, the focusing of the ultrasonic energy and the pressing of the washing cloth to the rubber or cylinder surface are fulfilled by a component.
Weitere Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen anhand der
Für das Waschen des Gummituchs ist, wie bei Offsetdruckmaschinen üblich, eine Gummituchwascheinrichtung GTW vorgesehen, die entlang des Pfeils P beim Auftragswechsel nach dem Ende des Druckbetriebs an den Gummituchzylinder GTZ angestellt werden kann. Diese Wascheinrichtung GTW enthält üblicherweise ein Waschtuch 10, das zyklisch getaktet von einem Vorratswickel 11a abgewickelt und auf einen zweiten Wickel 11b aufgewickelt wird. Dazwischen wird das Waschtuch 10 von einem Andrückelement 11 gegen die Oberfläche des zu reinigenden Gummituchs GT gedrückt.For washing the blanket, as usual in offset printing machines, a blanket washing device GTW is provided, which can be employed along the arrow P during order change after the end of the printing operation on the blanket cylinder GTZ. This washing device GTW usually contains a
Üblicherweise arbeiten solche Gummituchwascheinrichtungen so, dass die zu reinigende Zylinderoberfläche unter dem angedrückten Waschtuch vorbeidreht und dieses mehrfach während einer Umdrehung schrittweise weitergetaktet wird, um den eingefärbten streifenförmigen Bereich des Waschtuchs immer wieder in Richtung des Aufnahmewickels 11b weiter zu befördern. Die Wascheinrichtung enthält weiterhin einen Antrieb für die Bewegung des Waschtuchs sowie eine Einrichtung für die Zufuhr von Waschflüssigkeit, soweit nicht schon die Vorratsrolle 11 a mit Waschflüssigkeit getränkt ist.Usually, such blanket washing devices work so that the cylinder surface to be cleaned rotates past the pressed-on wash cloth and this is repeatedly indexed several times during one revolution in order to convey the colored strip-shaped region of the washing cloth again and again in the direction of the take-
Im Ausführungsbeispiel nach
Wie in der
Natürlich ist es auch möglich, anstelle einer einzigen Sonotrode 13 mehrere einzelne kürzere Sonotroden in dem Profil 12 anzuordnen. Die werden dann beim Betrieb der Wascheinrichtung zweckmäßig gleichphasig angesteuert, um destruktive Indifferenzen zu vermeiden. In diesem Fall kann es auch zweckmäßig sein, Stege zwischen den beiden Schenkeln des U-förmigen Profils 12 vorzusehen, die ein Abdichten zwischen den einzelnen Sonotroden gegen das Eindringen von Waschwasser in das Innere des Gehäuses 12 ermöglichen. In diesem Fall wird man die einzelnen Sonotroden zweckmäßig über verschließbare Öffnungen auf der Oberseite des Profils 12 einfügen.Of course, it is also possible to arrange a plurality of individual shorter sonotrodes in the
Im Ausführungsbeispiel nach
Im Unterschied zu dem Ausführungsbeispiel nach
Über der der Ultraschallstrahlkeule angepassten Öffnung 21 zwischen den beiden U-förmigen Schenkeln des Profils 22 liegt eine den Flüssigkeitsstrom begrenzende Membran 26 aus Kunststoff, Gummi oder einer porösen Keramik auf. Bei der Materialwahl wird zweckmäßig die Dichte der Membran an die Dichte der Waschflüssigkeit angepasst, um unerwünschte Reflexionen der Ultraschallenergie an der Grenzfläche zur Membran 26 zu vermeiden. Die Membran 26 begrenzt den Durchfluss der Waschflüssigkeit von den Zuflussröhrchen 25 in das Waschtuch 10 hinein und stellt sicher, dass keine Waschflüssigkeit austritt, wenn der Waschvorgang abgeschlossen ist und der Druck in den Zuflussröhrchen 25 abgeschaltet wird.Over the ultrasound beam lobe adapted opening 21 between the two U-shaped legs of the
Die zylindrische Kunststofflinse 29 besteht aus Plexiglas. Weil in diesem Material die Schallgeschwindigkeit fast doppelt so hoch ist als in Wasser, wirkt die plankonkave Zylinderlinse sammelnd und konzentriert die Ultraschallleistung in einem sehr schmalen linienförmigen Bereich, wie das durch die Pfeile angedeutet ist.The cylindrical
Natürlich ist es bei entsprechender Dimensionierung von Radius der Zylinderlinse und ihrem Abstand zur Oberfläche des Gummituches auch möglich, andere Kunststoffe wie Polyacryl etc. einzusetzen.Of course, it is also possible with appropriate dimensioning of the radius of the cylindrical lens and its distance from the surface of the blanket, other plastics such as polyacrylics, etc. use.
Durch die Verwendung mehrerer einzelner Sonotroden ergibt sich der Vorteil, dass die Länge des Andrückelements der Gummituchwascheinrichtung an unterschiedliche Formatbreiten angepasst werden kann, ohne dass jeweils spezielle Einzelsonotroden für das Format gefertigt werden müssen. In gleicher Weise kann anstelle der Zylinderlinse aus Kunststoff eine Anzahl einzelner torischer oder zylindrischer Einzellinsen vorgesehen sein, die jeweils den einzelnen Sonotroden zugeordnet sind. Hierbei unterstützt eine torische Ausbildung der Einzellinsen die Gleichmäßigkeit der Schallausbreitung entlang der Zylinderoberfläche über die durch die Stege abgeschalteten Bereiche hinweg.By using a plurality of individual sonotrodes, there is the advantage that the length of the pressure element of the blanket washing device can be adapted to different format widths, without the need to manufacture special individual sonotrodes for the format in each case. In the same way, a number of individual toric or cylindrical individual lenses may be provided instead of the cylindrical lens made of plastic, which are each associated with the individual sonotrodes. In this case, a toric formation of the individual lenses supports the uniformity of the sound propagation along the cylinder surface over the regions which are switched off by the webs.
Im Ausführungsbeispiel nach
Im Ausführungsbeispiel nach
Im Ausführungsbeispiel nach
Die Ultraschallgeber 53 sind die gleichen wie die nach
Die Waschflüssigkeit wird in diesem Ausführungsbeispiel durch separate Sprühdüsen 55 neben dem Andrückelement auf das Waschtuch 10 aufgesprüht. Das Waschtuch 10 bewegt sich dabei mit geringerer Geschwindigkeit während des Waschens an dem Andrückelement vorbei, während gleichzeitig der Zylinder GTZ mit dem Gummituch GT in entgegengesetzter Richtung das Gummituch GT unter dem Andrückelement bzw. dem Waschtuch 10 vorbeibewegt.The washing liquid is sprayed in this embodiment by
Die
Im Ausführungsbeispiel nach
Der untere Bereich der Schenkel 62a und 62b verjüngt sich etwas zur Mitte hin. In diesen Bereich ist ein Kunststoffrohr 69 aus einem Material mit dem Vergleich zur Waschflüssigkeit sehr viel höherer Dichte wie beispielsweise Polyethylen eingelegt. Dieses Kunststoffrohr ist auf beiden Seiten oben und unten abgeflacht. Auf die obere Abflachung setzen sich die planen Unterseiten der Ultraschallgeber 63, während sich das Kunststoffrohr 69 mit seiner unteren Abflachung auf das Waschtuch 10 setzt bzw. von den Federn 66 über die Ultraschallgeber 63 an dieses angedrückt wird, wenn die Wascheinrichtung mit dem Profil 62 in Richtung auf das Gummituch GT zugestellt wird.The lower portion of the
Im Rohr sind im Bereich der unteren Abflachung Kapillaren 67 eingebracht, durch die die Waschflüssigkeit bei entsprechendem Druck austritt und das Waschtuch 10 benetzt.In the
Bei diesem Ausführungsbeispiel fokussiert der zylindrische Flüssigkeitsstab der Waschflüssigkeit in Verbindung mit den plankonkaven Zylinderlinsen der Abflachungen des Kunststoffrohres 69 die Ultraschallenergie in der gewünschten Weise auf einen schmalen linienförmigen Bereich. Außerdem erfüllen bei diesem Ausführungsbeispiel die Federn 66 eine doppelte Funktion: Sie drücken die Ultraschallgeber 63 fest auf ihren Sitz und das Rohrteil 69 des Andrückelements fest gegen das Waschtuch 10.In this embodiment, the cylindrical liquid rod of the washing liquid in conjunction with the plano-concave cylindrical lenses of the flats of the
Die
Im Ausführungsbeispiel nach
In das Kunststoffrohr 79 ist ein Metallprofil 72 eingeschoben und wird dort über zwei Vorsprünge 71a und 71b in den entsprechenden Nuten im Kunststoffrohr 79 gehalten. In dem Metallprofil 72 sind dicht and dicht mehrere im Querschnitt rechteckige Ultraschallgeber 73 eingekapselt aufgenommen, wobei deren Unterseiten 79 wie beim Ausführungsbeispiel nach
- PZPZ
- Plattenzylinderplate cylinder
- GTGT
- Gummituchblanket
- GTZGTZ
- GummituchzylinderBlanket cylinder
- PBPB
- Papierbogensheet of paper
- GDZGDZ
- GegendruckzylinderImpression cylinder
- 1010
- Waschtuchwashcloth
- 1111
- Andrückelementpressing element
- 11a11a
- Vorratswickelsupply roll
- 11b11b
- Aufnahmewickelup reel
- 12, 2212, 22
- U-förmiges ProfilU-shaped profile
- 12a12a
- LeistenAfford
- 13, 23, 33, 43, 53, 63, 7313, 23, 33, 43, 53, 63, 73
- Sonotrode(n) (Ultraschallgeber)Sonotrode (s) (Ultrasound Transducer)
- 13a,b13a, b
- leistenförmige Massestrip-shaped mass
- 13c, 23c, 43, 53c, 63c, 73c13c, 23c, 43, 53c, 63c, 73c
- Piezo-keramische SchichtPiezo-ceramic layer
- 14, 34, 4414, 34, 44
- konkave Unterseiteconcave underside
- 15,2515.25
- Zuflussröhrcheninflow tube
- 16,26,36,46,56,66,7616,26,36,46,56,66,76
- Federnfeathers
- 1717
- Kanälechannels
- 1818
- Dichtungpoetry
- 2121
- Öffnungopening
- 22, 4222, 42
- Aluminiumprofilaluminum profile
- 22b22b
- Nutengroove
- 2626
- Membranmembrane
- 29, 3929, 39
- Zylinderlinse (Kunststoff)Cylindrical lens (plastic)
- 33a, 33b, ...33a, 33b, ...
- Ultraschallgeberultrasonic generator
- 36a,36b36a, 36b
- Federnfeathers
- 3838
- Prismenleisteprism bar
- 41a, 41b41a, 41b
- Schieberpusher
- 42a42a
- Schultershoulder
- 4848
- Dichtbandsealing tape
- 5151
- Rippenribs
- 5252
- KunststoffprofilPlastic profile
- 52a52a
- LeistenAfford
- 5555
- Sprühdüsenspray nozzles
- 5757
- Deckelcover
- 5858
- Stiftepencils
- 5959
- Längsnutlongitudinal groove
- 60, 7060, 70
- Flüssigkeitsstabliquid staff
- 62a,b62a, b
- Schenkelleg
- 62c62c
- Querstrebecrossmember
- 6767
- Kapillarencapillaries
- 69, 7969, 79
- KunststoffrohrPlastic pipe
- 71a,b71a, b
- Vorsprüngeprojections
- 7272
- Metallprofilmetal profile
- 78a78a
- Einlassstutzeninlet port
- 78b78b
- Auslassstutzenoutlet
Claims (18)
dadurch gekennzeichnet,
dass der Ultraschallquelle (13; 23; 33; 43; 53; 63; 73) eine fokussierende Einrichtung (14; 29; 34; 39;44; 54; 59; 60; 69; 70; 79) vorgeordnet ist, von der die Schallenergie auf einen im wesentlichen linienförmigen sich parallel zur Achse des Zylinders (GT) erstreckenden Fokusbereich auf der Zylinderoberfläche konzentriert wird.A cylinder (GT) washing apparatus in a printing machine having a washing cloth (10) for removing impurities, paint, etc. from the cylinder surface and an ultrasonic source for assisting the washing operation directing sound energy to the cylinder surface,
characterized,
in that the ultrasonic source (13; 23; 33; 43; 53; 63; 73) is preceded by focusing means (14; 29; 34; 39; 44; 54; 59; 60; 69; 70; 79), of which the Sound energy is concentrated on a substantially linear parallel to the axis of the cylinder (GT) extending focus area on the cylinder surface.
dadurch gekennzeichnet,
wobei die Ultraschallquelle aus einer Anordnung mehrerer Einzelschwinger (23, 33, 43, 53, 63, 73) besteht und die Einzelschwinger (23, 33, 43, 53, 63, 73) vorzugsweise entlang bzw. abwechselnd versetzt zu einer Geraden parallel zur Achse des Zylinders (GT) angeordnet sind.Washing device according to claim 1,
characterized
wherein the ultrasonic source consists of an arrangement of a plurality of individual oscillators (23, 33, 43, 53, 63, 73) and the individual oscillators (23, 33, 43, 53, 63, 73) preferably along or alternately offset to a straight line parallel to the axis of the cylinder (GT) are arranged.
dadurch gekennzeichnet,
wobei die Ultraschallquelle aus einer oder mehreren langgestreckten Sonotroden (13, 23, 73) besteht.Washing device according to one of claims 1 or 2,
characterized
wherein the ultrasonic source consists of one or more elongated horns (13, 23, 73).
wobei die fokussierende Einrichtung mehrere torische oder zylindrische Schalllinsen (29; 39; 59; 69; 79) aufweist.Washing device according to one of claims 1 to 3,
wherein the focusing means comprises a plurality of toric or cylindrical acoustic lenses (29; 39; 59; 69; 79).
wobei die fokussierende Einrichtung mindestens teilweise durch eine zylindrisch konkave Formgebung (14, 34, 44) der Sonotroden bzw. Schwinger gebildet ist.Washing device according to one of claims 1 to 3,
wherein the focusing means is at least partially formed by a cylindrically concave shape (14, 34, 44) of the sonotrodes or oscillators.
wobei sich Flüssigkeit im Bereich zwischen der Ultraschallquelle und der Zylinderoberfläche befindet und die Flüssigkeit Bestandteil der fokussierenden Einrichtung ist oder sich im Bereich zwischen der fokussierenden Einrichtung und der Zylinderoberfläche befindet.Washing device according to one of claims 1 to 5,
wherein liquid is in the area between the ultrasonic source and the cylinder surface and the liquid is part of the focusing means or is in the area between the focusing means and the cylinder surface.
wobei es sich bei der Flüssigkeit um Waschflüssigkeit handelt und die Waschflüssigkeit dem Bereich zwischen der fokussierenden Einrichtung und dem Waschtuch (10) zugeführt ist.Washing device according to claim 6,
wherein the liquid is washing liquid and the washing liquid is supplied to the area between the focusing means and the washing cloth (10).
wobei zwischen dem mit der Waschflüssigkeit gefüllten Bereich und dem an der Zylinderoberfläche anliegenden Waschtuch eine den Flüssigkeitsstrom begrenzende, Ultraschall durchlässige Membran (26) angeordnet ist, die vorzugsweise als gelochtes Gummi- oder Kunststoffteil oder poröses Keramikteil ausgebildet ist.Washing device according to claim 7,
wherein between the filled with the washing liquid area and the applied surface on the cylinder surface a liquid flow limiting, ultrasound-permeable membrane (26) is arranged, which is preferably formed as a perforated rubber or plastic part or porous ceramic part.
wobei die Membran als Zylinderlinse (59, 69, 79) wirkt.Washing device according to claim 8,
wherein the membrane acts as a cylindrical lens (59, 69, 79).
wobei die Zylinderlinse (59, 69, 79) das Waschtuch gegen die Zylinderoberfläche drückt.Washing device according to one of claims 4 or 9,
wherein the cylindrical lens (59, 69, 79) presses the washing cloth against the cylinder surface.
gekennzeichnet durch
einen das Waschtuch im Waschbetrieb kontinuierlich bewegenden Antrieb.Washing device according to one of claims 4 or 9,
marked by
a washing cloth which continuously moves the washing cloth during the washing operation.
wobei die Fasern des Waschtuchs aus einem die Ultraschallwellen wenig absorbierenden bzw. dämpfenden Material bestehen.Washing device according to one of claims 1 to 11,
wherein the fibers of the washing cloth consist of a material which does not absorb or dampen the ultrasonic waves.
wobei die Ultraschallquelle eine axiale Ausdehnung von wenigstens 70 cm, vorzugsweise 90 bis 110 cm, besitzt, die Leistungsaufnahme der Ultraschallquelle während des Waschbetriebes geringer als 1000 Watt ist und das Waschtuch eine Dicke von wenigstens 1 mm im nicht angedrückten Zustand besitzt.Washing device according to one of claims 1 to 12,
wherein the ultrasonic source has an axial extent of at least 70 cm, preferably 90 to 110 cm, the power consumption of the ultrasonic source during the washing operation is less than 1000 watts and the washcloth has a thickness of at least 1 mm in the non-pressed state.
wobei der Raum zwischen den Ultraschallquellen (53) und der fokussierenden Einrichtung (59) mit einer elektrisch nicht leitenden Flüssigkeit gefüllt ist.Method according to claim 6,
wherein the space between the ultrasonic sources (53) and the focusing means (59) is filled with an electrically non-conductive liquid.
wobei Öl die Ultraschallquellen (53, 63) umgibt und die bei deren Betrieb entstehende Wärme aufnimmt bzw. abführt.Washing device according to one of claims 1 to 14,
wherein oil surrounds the ultrasonic sources (53, 63) and absorbs or dissipates the heat generated during their operation.
wobei die fokussierende Einrichtung als hohles rohrförmiges oder stabförmiges Teil (69,79) ausgebildet ist, dessen Innenraum mit Waschflüssigkeit (70) gefüllt ist und das mit Bohrungen bzw. Kapillaren (67) für den Antritt von Waschflüssigkeit versehen ist.Washing device according to claim 10,
wherein the focusing means is formed as a hollow tubular or rod-shaped part (69,79) whose interior is filled with washing liquid (70) and which is provided with bores or capillaries (67) for the onset of washing liquid.
wobei die Zylinderlinse (29; 39) bzw. das stab- oder rohrförmige Teil (69, 79) aus einem Kunststoff besteht, in dem die Schallgeschwindigkeit höher als in Wasser ist, und es sich bei dem Material des Kunststoffes vorzugsweise um Polystyrol, Plexiglas, Polyethylen oder Polyacryl handelt.Washing device according to one of claims 4 to 16,
wherein the cylindrical lens (29; 39) or the rod-shaped or tubular part (69, 79) consists of a plastic in which the speed of sound is higher than in water, and the material of the plastic is preferably polystyrene, Plexiglas, Polyethylene or polyacrylic is.
gekennzeichnet durch
eine gemeinsame Ansteuerelektronik, von der die Einzelschwinger mit gleicher Frequenz und fester Phasenbeziehung zueinander angesteuert werden.Washing device according to claim 2,
marked by
a common control electronics, of which the individual oscillators are driven with the same frequency and fixed phase relationship to each other.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007030572A DE102007030572A1 (en) | 2007-07-02 | 2007-07-02 | Washing device for a cylinder in a printing machine |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2011653A2 true EP2011653A2 (en) | 2009-01-07 |
EP2011653A3 EP2011653A3 (en) | 2011-02-02 |
EP2011653B1 EP2011653B1 (en) | 2012-02-08 |
Family
ID=39870477
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08104533A Not-in-force EP2011653B1 (en) | 2007-07-02 | 2008-06-25 | Washing device for a cylinder in a printing machine |
Country Status (5)
Country | Link |
---|---|
US (1) | US8528476B2 (en) |
EP (1) | EP2011653B1 (en) |
CN (1) | CN101337457B (en) |
AT (1) | ATE544593T1 (en) |
DE (1) | DE102007030572A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102008053118A1 (en) * | 2008-10-26 | 2010-04-29 | Michael Kasper | Apparatus and method for cleaning blankets on blanket cylinders |
CN101870197B (en) * | 2009-04-23 | 2014-06-04 | 海德堡印刷机械股份公司 | Washing device |
DE102011012891A1 (en) * | 2010-03-29 | 2011-09-29 | Heidelberger Druckmaschinen Ag | Rotary printing unit for sheet-processing rotary printing machine for lithographic offset printing, has suction device brought into working position, where suction device sucks liquid from rotating surface of printing form cylinder |
DE102012216400B4 (en) * | 2012-09-14 | 2016-08-04 | Bundesdruckerei Gmbh | Apparatus and method for cleaning a surface |
JP2015024503A (en) * | 2013-07-24 | 2015-02-05 | 凸版印刷株式会社 | Printer, printing method and printed matter |
GB202005190D0 (en) | 2020-04-08 | 2020-05-20 | Absolute Engineering Ltd | Cleaning system and mnethod |
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- 2008-06-25 EP EP08104533A patent/EP2011653B1/en not_active Not-in-force
- 2008-07-02 US US12/166,616 patent/US8528476B2/en not_active Expired - Fee Related
- 2008-07-02 CN CN2008101295828A patent/CN101337457B/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
US20090007810A1 (en) | 2009-01-08 |
EP2011653A3 (en) | 2011-02-02 |
US8528476B2 (en) | 2013-09-10 |
DE102007030572A1 (en) | 2009-01-08 |
ATE544593T1 (en) | 2012-02-15 |
EP2011653B1 (en) | 2012-02-08 |
CN101337457A (en) | 2009-01-07 |
CN101337457B (en) | 2012-05-23 |
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