EP0779150B1 - Washing system of graphic industry machine - Google Patents

Abstract

The unit comprises a solvent recirculation circuit (6,8,10). This has a forward feed (8) for feeding cleaning fluid from a storage tank (6) to a rotary body (2) to be cleaned. A back flow (10) feeds back the cleaning fluid from the body's washing device (4,14,16). A cleaner cleans the returned dirtied cleaning fluid on its way in the back flow. The cleaner incorporates at least one ion exchanger (32), which separates out at least one of the dissolved contaminants from the cleaning fluid.

Description

The invention relates to a washing system of the graphic Industry for washing paint, fibers, dust and other contaminants from rotating bodies while these rotating bodies rotate with one Cleaning liquid, which solvent to dissolve the Paint and to dissolve other soluble Contains impurities, according to the preamble of Claim 1. Furthermore, the invention relates to a method for a machine of the graphic industry for Wash off according to the generic term of the independent Subclaim for this procedure.

Washing machines for washing rotating Rotational bodies of a graphic machine Industry, in particular printing machines, and the like turn from offset printing machines, are out known various writings. The detergent for washing the rotating body is in one Recirculation cycle. From the DE utility models G 91 15 948.2 and G 88 01 323.5 as well DE-C-30 05 236 and DE-A-41 16 762 it is known mechanical in the return of the recirculation circuit Arrange filters through which from the cleaning liquid, which from a rotating body to one Storage tank flows back, mechanical components be filtered. From DE-A 30 25 639 it is known to use a centrifuge as a filter medium which solid contaminants from the cleaning liquid be segregated. It is also over DE-A 41 16 762, US-A 5 323 705 and the patent Abstracts of Japan, M-983, June 12, 1990 Vol. 14 / No. 271 and the Japanese described therein Patent Application Publication 2-78552 (A), which Clean the cleaning liquid by distillation.

When cleaning with filters or centrifuges only solid particles from the cleaning liquid filtered out. Dissolved in the cleaning liquid Contamination components cannot are filtered out, especially ink residues, which are dissolved in the cleaning liquid. This will make the cleaning fluid after some Operating time saturated with dissolved impurities and must be replaced or chemically processed become. The mechanical filters have the disadvantage that them through the solid contaminants after some Clogging up operating time and preventing one such constipation cleaned from time to time or need to be replaced. Distillation devices have the disadvantage that they have a large apparatus structure need and are expensive. They're also dangerous because the boiling point of the components of the Cleaning liquid usually over yours Flash point is.

The cleaning liquid in the graphics industry must not have a negative impact on print quality to have. That is why there are modern cleaning fluids mainly from high quality organic substances, which not only have a cleaning effect, but at the same time also effects that affect the printing process are advantageous, for example a metered Moisten the rotating body during the Printing process for the purpose that no ink from the printed print carrier adheres to the rotating body and is transferred to this, which damage the Print image on the print carrier would mean. As Cleaning liquid can also, for example "Dampening solution" are used, which in the same printing press is also used in Offset printing process on the printing plate of the Printing plate cylinder ink-repellent areas form.

The invention is not for cleaning Printing unit cylinders, for example blanket cylinders, Impression cylinder or plate cylinder limited but for continuous or discontinuous cleaning of all cylinders and Rolling machines of the graphic industry applicable, for example for cleaning the cylinder from Printing units, the roles of inking units or Dampening, for cleaning guide rollers, the Cylinder of calenders, for cleaning rollers or Cylinders in glue applicators and laminating machines. The print media can be sheets, for example Sheets of paper for brochures or newspapers, or webs be from one unwinding reel to one Winding roll or run to a cutter, which cuts the web into arches.

The object of the invention is to be achieved Rotary body of machines of the graphic industry of components dissolved in it without cleaning the Exchange cleaning fluid and without the Machine operation or print quality too affect. This task is to be solved by means which are not structurally large devices need which are not expensive and which harmless with regard to fire and explosion are.

This object is achieved according to the invention by the Combination of features of independent claims solved.

Further features of the invention are in the Subclaims included.

Fig. 1

schematisch eine Waschanlage nach der Erfindung für eine Maschine der graphischen Industrie zum Abwaschen von Farbe, Fasern, Staub und anderen Verunreinigungen von Rotationskörpern dieser Maschine.

The invention is described below with reference to the accompanying drawing using a preferred embodiment as an example, therein

Fig. 1

schematically a washing system according to the invention for a machine in the graphics industry for washing off paint, fibers, dust and other contaminants from rotating bodies of this machine.

Fig. 1 shows broken off a rotating body 2 one Machine of the graphic industry, for example a rubber impression cylinder, impression cylinder, impression cylinder or an ink roller of an offset printing machine or similar. The car wash for cleaning the Rotating body 2 with a solvent-containing Cleaning fluid contains a rotating one Washing roller 4, which is continuous or discontinuously abuts the rotating body 2, which also rotates. The speeds and Direction of rotation of the rotating body 2 and Wash roller 4 are chosen such that between their relative surfaces on one another takes place. Instead of a washing roller 4 can also other washing element can be used. The Cleaning liquid is in a storage container 6 stored, which also fresh cleaning liquid can be supplied and from which the Cleaning liquid via a flow 8 Washer roller 4 fed and via a return 10 Storage container 6 is returned. The Flow 8 contains a pump 12 to promote the Cleaning liquid from the reservoir 6 too a nozzle device 14 with one or more nozzles at the end of the lead 8, which the Spray cleaning liquid on the washing roller 4. Of the washing roller 4 dripping fresh Cleaning liquid and from the rotating body 2 of the washing roller 4 stripped dirty Cleaning liquid and if necessary from Rotating body 2 spraying cleaning liquid is by a sump 16 at the beginning of the return 10 caught. The return 10 contains one after the other in Flow direction the collecting wall 16, one over a upstream line 18 connected to it Return tank 20, a 2/2-way valve 22, one Intermediate line 25 with a pump 24, a Filter device 26 with a coarse filter 28 and downstream fine filter 30 for filtering Solid particles from the cleaning liquid, and an ion exchanger 32 in a downstream one Return line section 33 between the Filter device 26 and the reservoir 6.

The cleaning liquid circulates in the Storage container 6, flow 8 and return 10 existing recirculation cycle during the Cleaning operation when said first valve 22nd not the closed position shown, but Has open position while everyone else in the Valves shown drawing their closed position to have. Closed position here means that the valves do not let liquid through; Open position means here that the valves let fluid through. On Level switch 34 effects via a control device, that pumps 12 and 24 are only switched on when the cleaning liquid in the return tank 20 has reached a certain level, but not at a lower level.

A flush line 36 with a second valve 38 connects the reservoir 6 to the intermediate line 25 of the return 10 upstream of its pump 24. By closing the first valve 22 and opening the second valve 38, the filters 28 and 30 of the Filter device 26 rinsed in the forward direction are turned on, with only the return pump 24 is while the flow pump 12 is turned off.

The filters 28 and 30 of the filter device 26 can be in Backwashed when the first valve is flushed 22 is closed, the second valve 38 is opened a third bridging the return pump 24 Valve 40 opened, one on the pressure side of the Return pump 24 arranged and from the third valve 40 also bypassed fourth valve 42 on the Pressure side of the return pump 24 is closed, the downstream return line section 33 upstream of the ion exchange 32 by a fifth Valve 44 is closed, the pressure side of the flow pump 12 by closing a sixth valve 46 from Flow separated and by opening a seventh valve 48 connected to the output of the filter device 26 the feed pump 12 is turned on while the return pump 24 is switched off.

The ion exchanger 32 contains at least one, or several arranged in series or parallel to each other, of the cleaning liquid of the return 10 flowed through ion filter 50. The ion filter 50 contain filter media for ion exchange and thus for Filter out dissolved components of the Cleaning liquid, especially for ionic Filter out alkaline colors and acidic ones Colours. In the preferred embodiment, if the Cleaning liquid contains organic components, which react with oxygen in air and thereby Form peroxides, for example in the collecting trough 16 the washing roller 4 and / or the rotating body 2, then preferably also contains the ion exchanger Ion filter mass, which with these peroxides one Generates ion exchange and thereby these peroxides filters out the cleaning liquid. The Ion filter media are preferred Ion exchange resins. Of course you can too other substances dissolved in the cleaning liquid this cleaning liquid by ion exchange be filtered out. Depending on the type of solved Substances that are to be filtered out must be Ion exchanger 32 one adapted for this Contain ion exchange mass.

If after some operating time the ion exchanger 32 has no exchangeable ions, the Ion filter masses 50 exchanged or regenerated become. A cover 52 is for such an exchange of the ion exchanger 32 removable. For one Regeneration of the ion filter masses of the ion filter 50 you need to use a suitable chemical solution be rinsed. For this conditioner to regenerate the Ion exchanger 32, it is over at its lower end an eighth valve 54 can be connected to a tub 55, and at its upper end facing away from it a ninth Valve 56 with a second regenerant container 58 connectable, in which the Chemical solution. During the flushing of the Ion exchanger 32 with the chemical solution must downstream return line section 33 through Closing the fifth valve 44 from the Filter device 26 and by closing a tenth Valve 60 from the reservoir 6 Cleaning liquid can be separated.

The ion exchanger 32 can also without one upstream filter device 26 for filtering Solid contaminants are used. According to other embodiments, the ion exchanger 32 also used in combination with other filter types become.

For filtering out undissolved solid contaminants can instead of or in addition the Filter device 26 a centrifugal separator, e.g. a decanter, in the return 10 arranged upstream of the ion exchanger 32 become.

The principle of operation of the invention or Ion exchanger is based on the fact that printing ink ingredients, such as manganese salts and Cobalt salts and peroxides, on strongly acidic and / or on strongly basic ion exchangers, preferably Ion exchange resins are bound. The Ion exchanger is preferably a so-called Mixed bed reactor, which according to the so-called Mixed bed process works. This will both Ink ingredients, which by acid Ion exchangers, as well as those which are made by basic Ion exchangers can be bound from the Cleaning liquid excreted.

The invention can also be called "absorbent Solvent cleaning system for offset machines "or as "regeneration process for printing blanket cleaning" be designated. Preferably be for the Replaceable cartridge-shaped invention Ion exchange filter elements used.

In the context of the invention "at least" means that one or more of the elements so designated in Parallel connection or series connection to each other can be used.

Claims (11)

1. A washing device of a machine of the graphics industry for washing inks, fibres, dust and other impurities from rotary elements, with a cleaning fluid, which contains solvent for dissolving at least one of the soluble impurities, the washing device comprising the following: a recirculation circuit (6, 8, 10), which comprises a feed line (8) for the supply of cleaning fluid from a supply receptacle (6) to the rotary element (2) which is to be cleaned and a return line (10) for conveying the cleaning fluid from a washing device (4, 14, 16) used for washing the rotary element (2) back to the supply receptacle (6); cleaning means (32) for cleaning the returned contaminated cleaning fluid on its path in the return line (10); characterised in that the cleaning means comprises at least one ion exchanger (32), which is constructed in such a manner that it separates at least one of the dissolved impurities from the cleaning fluid by ion exchange.
2. A washing device according to claim 1, characterised in that the ion exchanger (32) comprises at least one ion filter compound for the ionic filtering of inks, more particularly alkaline inks and/or acidic inks.
3. A washing device according to claim 1 or 2, characterised in that the ion exchanger (32) comprises an ion filter compound for the ionic filtering of peroxides from the cleaning fluid.
4. A washing device according to one of the preceding claims, characterised in that the ion filter compound comprises a plurality of different ion exchange resins.
5. A washing device according to one of the preceding claims, characterised in that means (54, 55, 56, 58) for regenerating the ion exchanger (32) are provided, without having to fully or partially remove or disassemble the ion exchanger.
6. A washing device according to one of claims 1 to 4, characterised in that the ion filter compound (50) of the ion exchanger (32) is replaceably arranged.
7. A washing device according to one of the preceding claims, characterised in that arranged upstream of the ion exchanger (32) in the direction of flow is a device (26) for filtering out solid impurities from the returned cleaning fluid.
8. A method for a machine of the graphics industry for washing inks, fibres, dust and other impurities from rotary elements, with a cleaning fluid, which contains solvent for dissolving at least one of the soluble impurities, the method comprising the following steps: recirculation of the cleaning fluid from a supply receptacle (6) to a cleaning device (4, 14, 16) for cleaning the rotary element (2) and back again into the supply receptacle (6); cleaning of the cleaning fluid on its return path from the cleaning device (4, 14, 16) to the supply receptacle (6);
   characterised in that the cleaning fluid is conveyed for its cleaning through at least one ion exchanger (32), which is constructed in such a manner that it separates at least one of the impurities dissolved in the cleaning fluid from the cleaning fluid by ion exchange with said impurities.
9. A method according to claim 8, characterised in that at least inks, alkaline and/or acidic inks are separated from the cleaning fluid in the ion exchanger (32) by ion exchange with said inks.
10. A method according to claim 8 or 9, characterised in that peroxides are filtered out in the ion exchanger (32) by ion exchange.
11. A method according to one of claims 8 to 10, characterised in that solid impurities are filtered out of the cleaning fluid upstream of the ion exchanger by means of a filter device (26).

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