Cleaning textile roll, cleaning agent, cleaning textile and associated cleaning system and system

Abstract

Role of a cleaning textile for cleaning printing cylinders of a printing system, wherein the cleaning textile is impregnated with a cleaning agent composition, the cleaning agent composition comprising an organic solvent and a cellulose solubilizer, wherein the organic solvent is a propylene glycol oligomer, which is di(propylene glycol)propyl ether, and wherein the roller (12) is inserted into a removable sealing bag (15) which is designed to seal the roller (12) of cleaning textile (13) in order to prevent the cleaning agent composition from evaporating before use, wherein the sealing bag (15) is tubular and is made of a multilayer plastic film.

Description

TECHNICAL FIELD

[0001] The present invention relates to a roll of cleaning textile impregnated with a cleaning agent composition for cleaning printing cylinders in a printing system. The invention also relates to a cleaning agent composition, a cleaning textile, a system for cleaning printing cylinders, and a system for forming the roll. BACKGROUND

[0002] To ensure that printing cylinders achieve the desired printing results, they must be cleaned regularly. An example of a cleaning device for a printing system is shown in US 7,219,605 B2. Various cleaning methods are known, such as spraying a cleaning fluid onto the cylinders or cleaning them manually with a cleaning cloth dipped in a cleaning fluid.

[0003] The cleaning cloth is often pre-soaked with a cleaning agent formulated to dissolve and remove ink residue from the printing cylinders. Paper residue tends to adhere to the surfaces of the printing cylinders. The cleaning agent is difficult to dissolve this adhering paper residue, so it must be removed from the cylinders before cleaning with the cloth. Therefore, it is common practice to spray the printing cylinders with water using spray bars or nozzles installed in the printing system. For example, US 2005 250 659 A1 describes how water can be sprayed onto cylinders in a printing system to remove dirt and paper residue.

[0004] However, the spray bars, nozzles, and water lines that deliver water to the nozzles are prone to clogging due to the harsh environmental conditions within the printing system. The environment inside the printing system contains paper scraps, ink residue, and other contaminants that can clog the spray devices. Limescale present in the water used can also cause blockages.

[0005] Examples of prior art devices that attempt to solve the problems of blocked pipes and nozzles in pressure systems are presented in EP 4 352 69 A1 and EP 878 304 A1. Further background information can be found, for example, in documents US 5 340 495 A and GB 1 365 464 A. It is evident from the above that there is a need for improvement regarding the problems of blocked nozzles and pipes in pressure systems, etc. SUMMARY

[0006] The object of the present invention is to provide a concept that is an improvement over the prior art and solves or at least reduces the problems discussed above. This object is achieved by the technology set out in the attached independent claims, with preferred embodiments being defined in the associated dependent claims.

[0007] The present invention is based, among other things, on the idea that the step of spraying the printing cylinders with water can be omitted if the cleaning fluid itself, also referred to here as the cleaning agent composition, can dissolve cellulose paper residues. The inventor has surprisingly discovered that adding a cellulose solubilizer, preferably a non-aqueous cellulose solubilizer, also referred to here as a water substitute, to the cleaning fluid dissolves paper residues from the printing cylinders. Thus, the first washing step, i.e., spraying with water, can be eliminated from the cleaning process of the printing system. The cleaning agent composition according to the invention saves time, since many printing systems have to be cleaned several times a day. Furthermore, the labor-intensive process of cleaning and / or replacing clogged water pipes, spray bars, or nozzles is eliminated.

[0008] In the first aspect, a cleaning textile is provided, adapted and designed for cleaning the printing cylinders of a printing system. The cleaning textile is impregnated with a cleaning agent composition comprising an organic solvent and a cellulose solubilizer. This is an advantageous cleaning agent composition because the cellulose solubilizer makes it possible to omit the currently standard water spray step in the cleaning process of a printing system. The organic solvent gives the cleaning agent composition its ability to dissolve and remove printing ink from the printing cylinders.

[0009] In one embodiment, the cleaning agent composition comprises less than 10% by weight water, preferably less than 5% by weight water. In another embodiment, the cleaning agent composition comprises less than 2% by weight water. A water content of more than 2% by weight in the cleaning agent composition can cause it to evaporate. Furthermore, the ink-dissolving properties of the cleaning agent composition decrease when a higher water concentration is added.

[0010] Preferably, the water content of the cleaning agent composition is less than 1 wt.% and most preferably less than 0.5 wt.%.

[0011] In one embodiment, the cellulose solubilizer comprises an ethanolamine unit. In this context, an ethanolamine unit is defined as shown in Formula 1. The ethanolamine unit imparts a hydrophilic property to the solubilizer, which assists the solubilizer in dissolving water-soluble contaminants, such as paper residues, from the printing cylinders.

[0012] In one embodiment, the cellulose solubilizer in the cleaning agent composition, which comprises an ethanolamine unit, is an ethanolamide. Ethanolamides dissolve paper residues and other water-soluble contaminants adhering to the printing cylinders. Furthermore, the swelling of rubber in the printing system due to contact with the cleaning agent composition can be kept within an acceptable range when using ethanolamides.

[0013] In another embodiment, the ethanolamide in the cleaning agent composition is coconut diethanolamide. In addition to dissolving paper residues from printing cylinders, the addition of coconut diethanolamide to a cleaning agent composition with favorable ink solubility properties has been shown. It is likely that coconut diethanolamide efficiently dissolves paper by effectively absorbing moisture from the environment, which in turn breaks up paper dust and dissolves the paper residues from the printing cylinders. It has also been shown that coconut diethanolamide reduces the electrical resistance of the cleaning agent composition.

[0014] In another embodiment, the cellulose solubilizer in the cleaning agent composition, which comprises an ethanolamine group, is an ethanolamine. Ethanolamines dissolve paper residues and other water-soluble contaminants adhering to the printing cylinders. Furthermore, the swelling of rubber in the printing system due to contact with the cleaning agent composition remains within an acceptable range when using ethanolamines.

[0015] In another embodiment, the ethanolamine in the cleaning agent composition is triethanolamine. In addition to dissolving paper residues from printing cylinders, it has been shown that the addition of triethanolamine to a cleaning agent composition with favorable printing ink solubility properties.

[0016] In one embodiment, the cellulose solubilizer is a glycol ether, which is advantageous as a cellulose solubilizer because these compounds have the favorable solvent properties of ethers and alcohols with lower molecular weight and can thus dissolve paper residues and other water-soluble contaminants from the printing cylinders.

[0017] In another embodiment, the cellulose solubilizer is a C2-C6 alkanediol. The hydroxyl groups of the C2-C6 alkanediol give the compounds their hydrophilic properties and enable them to dissolve paper residues and other water-soluble impurities.

[0018] In another embodiment, the C2-C6 alkanediol is ethylene glycol (ethylene-1,2-diol), a C2 alkanediol with particularly favorable properties for dissolving paper residues from the printing cylinders.

[0019] In one embodiment, the cellulose solubilizer is a hydrophilic surfactant that dissolves water-soluble contaminants, such as paper residues, from the printing cylinders.

[0020] In another embodiment, the hydrophilic surfactant is a superwetting agent. Preferably, the superwetting agent is an amphoteric betaine, an anionic organic sulfate, or an amine oxide. The superwetting agent enables the cleaning agent composition to dissolve water-soluble contaminants, such as paper residues, from the printing cylinders. Furthermore, only a low concentration of the superwetting agent is required to dissolve paper residues and the like. Thus, the concentration of the superwetting agent can be as low as 0.05 to 0.1 wt%. The use of a low concentration of the cellulose solubilizer is advantageous because the amount of organic solvents that give the cleaning agent composition its ink-dissolving properties can be kept at a high level.

[0021] In another embodiment, the content of the cellulose solubilizer in the cleaning agent composition is between 0.05 and 20 wt.%, preferably between 0.075 and 10 wt.%, and most preferably between 0.1 and 5 wt.%. The concentration of the cellulose solubilizer must be balanced against the concentration of the organic solvent(s). If the concentration of the cellulose solubilizer is higher than 20 wt.%, the ink solubility of the cleaning agent composition decreases. If the concentration of the solubilizer is too low, i.e., below 0.05 wt.%, the cleaning agent composition does not dissolve and remove paper residues satisfactorily.

[0022] In one embodiment, the organic solvent content in the cleaning agent composition is between 80 and 99.05 wt.%, preferably between 90 and 99.025 wt.%, and most preferably between 95 and 99.9 wt.%. The concentration of the organic solvent must be balanced against the concentration of the cellulose solubilizer. If the organic solvent concentration is higher than 99.9 wt.%, the cellulose solubilizer concentration is too low, and the cleaning agent composition cannot dissolve the paper residues from the printing cylinders. If the organic solvent concentration is too low, i.e., below 80 wt.%, the cleaning agent composition will not dissolve or remove the ink residues satisfactorily.

[0023] In another embodiment, the cleaning textile is wound around a core to form the roll. This is preferable because the core can be efficiently mounted on the shaft of a cleaning cassette. Furthermore, the cleaning textile is easy to handle and protected when wound around a core.

[0024] In one embodiment, the roll is inserted into a removable sealing bag designed to seal the cleaning textile roll and prevent the cleaning agent composition from evaporating before use. Preferably, the removable sealing bag is made of plastic. The plastic sealing bag prevents the cleaning agent composition from evaporating. The plastic seal thus gives the roll a longer shelf life before use and protects it from environmental influences.

[0025] In another embodiment, the roll of cleaning cloth is vacuum-packed in the sealing bag. The vacuum packaging prevents the cleaning agent from migrating through diffusion within the bag. An uneven distribution of the cleaning agent, due to its accumulation in certain areas of the roll during storage, leads to inconsistent cleaning results during use. However, the vacuum packaging ensures an even distribution of the cleaning fluid throughout the roll, thus guaranteeing a high-quality cleaning result. Furthermore, the vacuum seal extends the roll's shelf life. The vacuum packaging also prevents other compounds and / or contaminants from entering the sealing bag and damaging the cleaning cloth roll.

[0026] A second aspect involves providing a cleaning agent composition specifically designed and formulated for cleaning the printing cylinders of a printing system. This composition includes an organic solvent and a cellulose solubilizer. The cleaning agent can be applied to a cleaning cloth or printing cylinder, for example, by spraying, without the need to add water, to dissolve paper residues from the printing system.

[0027] In one embodiment, the cleaning agent composition comprises less than 10 wt.% water, preferably less than 5 wt.% water.

[0028] In another embodiment, the cleaning agent composition comprises less than 2% by weight of water.

[0029] In one embodiment, the cellulose solubilizer in the cleaning agent composition comprises an ethanolamine unit. In this context, an ethanolamine unit is defined as shown in Formula I. The ethanolamine unit imparts a hydrophilic property to the solubilizer, which assists the solubilizer in dissolving water-soluble contaminants, such as paper residues, from the printing cylinders.

[0030] In one embodiment, the cellulose solubilizer in the cleaning agent composition, which comprises an ethanolamine group, is an ethanolamide. Ethanolamides dissolve paper residues and other water-soluble contaminants adhering to the printing cylinders. Furthermore, the swelling of rubber in the printing system due to contact with the cleaning agent composition can be kept within acceptable limits when using ethanolamides.

[0031] In another embodiment, the ethanolamide in the cleaning agent composition is coconut diethanolamide. The addition of coconut diethanolamide has proven advantageous for the printing ink solubility properties of the cleaning agent composition.

[0032] In another embodiment, the cellulose solubilizer in the cleaning agent composition, which includes an ethanolamine group, is an ethanolamine. Ethanolamines dissolve paper residues and other water-soluble contaminants adhering to the printing cylinders. Furthermore, the swelling of rubber in the printing system due to contact with the cleaning agent composition remains within an acceptable range when using ethanolamines.

[0033] In another embodiment, the ethanolamine in the cleaning agent composition is triethanolamine. In addition to dissolving paper residues from printing cylinders, it has been shown that the addition of triethanolamine to a cleaning agent composition with favorable printing ink solubility properties.

[0034] In one embodiment, the cellulose solubilizer is a glycol ether, which is advantageous as a solubilizer because these compounds have the favorable solvent properties of ethers and alcohols with lower molecular weight and can thus dissolve paper residues and other water-soluble contaminants from the printing cylinders.

[0035] In another embodiment, the cellulose solubilizer in the cleaning agent composition is a C2-C6 alkanediol. The hydroxyl groups of the C2-C6 alkanediol give the compounds their hydrophilic properties and enable them to dissolve paper residues and other water-soluble contaminants.

[0036] In another embodiment, the C2-C6 alkanediol in the cleaning agent composition is ethylene glycol (ethylene-1,2-diol), a C2 alkanediol with particularly favorable properties for dissolving paper residues from the printing cylinders.

[0037] In one embodiment, the cellulose solubilizer in the cleaning agent composition is a hydrophilic surfactant that dissolves water-soluble contaminants, such as paper residues, from the printing cylinders.

[0038] In another embodiment, the hydrophilic surfactant in the cleaning agent composition is a superwetting agent. Preferably, the superwetting agent is an amphoteric betaine, an anionic organic sulfate, or an amine oxide. The superwetting agent enables the cleaning agent composition to dissolve water-soluble contaminants, such as paper residues, from the printing cylinders. Furthermore, only a low concentration of the superwetting agent is required to dissolve paper residues and the like. Thus, the concentration of the superwetting agent can be as low as 0.05 to 0.1 wt.%. The use of a low concentration of the non-aqueous cellulose solubilizer is advantageous because the amount of organic solvents that give the cleaning agent composition its ink-dissolving properties can be kept at a high level.

[0039] In another embodiment, the content of the cellulose solubilizer in the cleaning agent composition is between 0.05 and 20 wt.%, preferably between 0.075 and 10 wt.%, and most preferably between 0.1 and 5 wt.%. The concentration of the cellulose solubilizer must be balanced against the concentration of the organic solvent(s). If the concentration of the cellulose solubilizer is higher than 20 wt.%, the ink solubility of the cleaning agent composition decreases. If the concentration of the solubilizer is too low, i.e., below 0.05 wt.%, the cleaning agent composition does not dissolve and remove paper residues satisfactorily.

[0040] In one embodiment, the organic solvent content in the cleaning agent composition is between 80 and 99.05 wt.%, preferably between 90 and 99.025 wt.%, and most preferably between 95 and 99.9 wt.%. The concentration of the organic solvent must be balanced against the concentration of the cellulose solubilizer. If the organic solvent concentration is higher than 99.9 wt.%, the cellulose solubilizer concentration is too low, and the cleaning agent composition cannot dissolve the paper residues from the printing cylinders. If the organic solvent concentration is too low, i.e., below 80 wt.%, the cleaning agent composition will not sufficiently dissolve and remove the ink residues.

[0041] A third aspect involves providing a cleaning textile specifically designed and adapted for cleaning the printing cylinders of a printing system. This cleaning textile is impregnated with a cleaning agent composition comprising an organic solvent and a cellulose solubilizer.

[0042] In one embodiment, the cleaning agent composition comprises less than 10 wt.% water, preferably less than 5 wt.% water.

[0043] In another embodiment, the cleaning agent composition comprises less than 2% water by weight. If the cleaning agent composition comprises more than 2% water by weight, the cleaning agent composition evaporates.

[0044] The cleaning textile can be manually rubbed or brushed against a pressure cylinder or installed in other cleaning devices not described here.

[0045] A fourth aspect describes a method for cleaning a printing cylinder of a printing system using a cleaning roller. The method comprises the steps of unwinding at least a portion of the cleaning textile impregnated with a cleaning agent composition from the roller and bringing at least a portion of the cleaning textile into contact with the printing cylinder.

[0046] A fifth aspect provides a method for forming a roll. The method comprises the steps of impregnating a cleaning textile with a cleaning agent composition, winding the cleaning textile around a core to form a roll, and inserting the roll into a sealable bag, preferably vacuum-packed.

[0047] In one embodiment, the cleaning textile is soaked with the cleaning agent composition after it has been wrapped around the core. An advantage of this is that the cleaning textile is easier to handle and soak once it is wrapped around the core. For example, the cleaning textile wrapped around the core can be placed in a sealable bag and soaked within that bag. This minimizes any loss of the cleaning agent composition and also reduces the spread of the cleaning agent composition into the surrounding area.

[0048] A sixth aspect provides the use of a roll of cleaning textile for cleaning printing cylinders of a printing system.

[0049] In a seventh aspect, a roll of cleaning textile is provided for cleaning printing cylinders of a printing system, wherein the cleaning textile is impregnated with a cleaning composition, the cleaning composition comprising an organic solvent and a cellulose solubilizer, the organic solvent being a propylene glycol oligomer, which is di(propylene glycol) propyl ether, and wherein the roll is inserted into a removable sealing bag designed to seal around the roll of cleaning textile to prevent the cleaning composition from evaporating before use, the sealing bag being tubular and constructed of a multilayer plastic film.

[0050] In one embodiment of the seventh aspect, the cleaning agent composition comprises less than 10% by weight of water, preferably less than 5% by weight of water, and most preferably less than 2% by weight of water. In another embodiment of the seventh aspect, the cleaning agent composition comprises aliphatic hydrocarbons for cleaning power. In another embodiment of the seventh aspect, the cleaning agent composition comprises a plasticizer, preferably diisononyl phthalate. In another embodiment of the seventh aspect, the cleaning textile is wound around a core to form the roll. In another embodiment of the seventh aspect, the roll of cleaning textile is vacuum-packed in the sealing bag.

[0051] In an eighth aspect, a cleaning agent composition is provided comprising an organic solvent and a cellulose solubilizer, wherein the organic solvent is a propylene glycol oligomer, which is di(propylene glycol) propyl ether. In one embodiment of this aspect, the cleaning agent composition comprises less than 10 wt% water, preferably less than 5 wt% water, and most preferably less than 2 wt% water.

[0052] In a ninth aspect, a cleaning textile is provided for cleaning printing cylinders of a printing system, wherein the cleaning textile is impregnated with a cleaning agent composition as mentioned in the eighth aspect or an embodiment related thereto.

[0053] In a tenth aspect, a cleaning system for cleaning a printing cylinder of a printing system is provided by means of a roll according to the seventh aspect or related embodiments; the system is configured to: - remove the roll from its sealed bag; - unwind at least a portion of the cleaning textile impregnated with a cleaning composition according to the eighth aspect or related embodiments from the roll; and - bring the portion of the cleaning textile into contact with the printing cylinder.

[0054] In an eleventh aspect, a system for forming a roll according to the seventh aspect or related embodiments is provided, wherein the system is configured to: - impregnate a cleaning textile with the cleaning agent composition according to the eighth aspect or related embodiments; - wrap the cleaning textile around a core to form a roll; and - insert the roll into a sealable bag, which is preferably vacuum-packed, and wherein the cleaning textile is optionally impregnated with the cleaning agent composition after it has been wrapped around the core. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In the following, embodiments of the invention are described, with reference to the accompanying schematic drawings, which represent non-limiting examples of how the inventive concept can be implemented in practice. Fig.Figure 1 shows a cross-section of a general pressure system with an arrangement of cylinders and a cleaning cassette with a roll of cleaning textile and a spray nozzle bar. Fig. Figure 2 shows an enlarged section from Fig. 1, Fig. Figure 3 shows the roll in perspective view and vacuum-packed in a sealing bag. Fig. 4 shows the in Fig. 3. Roll shown with partially removed sealing bag. Fig. Figure 5 shows the results of a printing ink solubility test, and Fig. Figure 6 shows test results from a paper residue and printing ink wash test. DETAILED DESCRIPTION

[0056] With reference to Fig.Figure 1 represents a general printing unit or printing system 1 with a number of printing cylinders and rollers 2, 3, 4, 5, 6. The printing system 1 described here has one printing cylinder 2 (the largest printing cylinder, shown at the bottom left). Fig. 1) a blanket cylinder 3 (the medium-sized cylinder next to the impression cylinder) with a blanket 3', referred to here as the blanket plate 3', and a plate cylinder 4 (the medium-sized cylinder next to the blanket cylinder). The blanket 3' is usually about 2 mm thick. The printing system 1 also has a number of inking rollers 5 (small rollers that are not dampening rollers) and a number of dampening rollers 6 (the five small rollers at the bottom right).

[0057] The set of inking rollers 5 is connected to an ink source 8, which supplies the inking rollers 5 with printing ink. The set of dampening rollers 6 is connected to a dampening source, in this case a water bath 9, which supplies the dampening rollers 6 with water. The printing system 1 further comprises a cleaning machine or cleaning cassette 10, which houses a cleaning device or roller 12 with a cleaning textile 13, also referred to as a cleaning cloth.

[0058] In the Fig. 1 and Fig.Figure 2 shows spray devices 17a, 17b, which are used in current cleaning systems. The spray devices 17a, 17b are shown with dashed lines to indicate that they belong to a currently used cleaning system. The cleaning cassette 10 includes a spray device 17a, 17b, also referred to herein as a spray nozzle assembly, which has spray nozzles either in position 17a or in position 17b. The spray device 17a, 17b is arranged and configured to spray the rubber sheet 3' of the blanket cylinder 3 with water to remove paper residues and other water-soluble residues adhering to the rubber sheet 3' on the printing cylinder 3. As shown in the Fig. 1 and Fig.As shown in Figure 2, the spray device 17a, 17b used in current cleaning systems can be arranged inside the cleaning cassette 10 and opposite the rubber blanket cylinder 3, or it can be arranged next to the cleaning cassette 10 opposite the rubber blanket cylinder 3.

[0059] Fig. Figure 2 shows the cleaning cassette 10 of the in Fig. 1. The cleaning cassette 10 comprises the cleaning roller 12, which contains a spool or core 14. The cleaning textile 13 is wound or coiled around the core 14, which may be solid or hollow and made of any suitable material, such as plastic, paper, or metal. It may also have different cross-sections, with the embodiment described here having a circular cross-section. The cleaning cassette 10 from the Fig. 1 and Fig. 2 also includes a collecting roller 16.

[0060] Fig.Figure 3 shows the roll 12 in a perspective view and vacuum-packed in a sealing bag 15, preferably made of plastic. The roll 12 comprises a core 14 and a cleaning textile 13, which is wrapped or wound around the core 14. The cleaning textile 13 has been soaked or impregnated with a cleaning fluid, also referred to here as a cleaning agent composition.

[0061] Fig. 4 shows the in Fig.Figure 3 shows the roll 12, with the sealing bag 15 partially removed. Preferably, the bag 15 is tubular and made of a multilayer plastic film. A suitable plastic film for this purpose is a three-layer film consisting of a first layer of polyethylene (PE) as a liquid barrier, a second middle layer of polyamide (PA) for strength, and a third layer of polyethylene (PE) as a liquid barrier and sealing layer. This three-layer plastic film has proven advantageous in practical tests. The thickness of the sealing film is designed so that it can be easily removed from the roll 12, as shown in Figure 3. Fig. Figure 4 shows. Preferably, the sealing bag 15 is vacuum-packed by heat-sealing the bag 15.

[0062] Fig. Figure 5 shows the results of a printing ink solubility test and Fig.6. The results of a paper residue wash test. The tests and results are explained in more detail in the following section “Tests”.

[0063] The printing process and the cleaning of printing system 1 will now be explained in more detail. With reference to Fig.During the printing process of printing system 1, water is transported to the cylinders via the dampening rollers 6, which receive water from the dampening source 9. The water thus reaches the non-pressurized areas between cylinders 2, 3, and 4. The printing ink is then transported to cylinders 3, 4, and 5 by means of the ink rollers 5, which receive ink from the ink source 8. The print is then transferred to the blanket cylinder 3 and the material, e.g., paper. The material, e.g., paper, to receive the print is positioned between the blanket roller 3' on the blanket cylinder 3 and the impression cylinder 2. Here, the printing process takes place, and the print is transferred from the blanket roller 3' to the material. The arrangement of cylinders and rollers shown and described here is only one example of the design of a printing system.

[0064] Depending on its type and use, the printing system 1 must be cleaned more or less frequently to maintain sufficient print quality. In conventional printing systems, the cleaning process usually begins with spraying a liquid, mostly water, which dissolves cellulose in the form of paper scraps and other water-soluble contaminants adhering to the printing cylinders. Once the water-soluble contaminants, such as paper scraps, have been removed, the cleaning cassette 10 can perform its cleaning function. The cleaning agent composition with which the cleaning cloth 13 is impregnated removes, among other things, ink residue from the printing cylinders 2, 3, 4, and 5.

[0065] Conventional cleaning methods comprise two separate steps. The first step, a water rinse where water is sprayed onto the rubber blanket cylinder, can be time-consuming and inefficient. Furthermore, the spray devices and the water lines supplying them are prone to clogging. Blockages in the spray devices and the lines that supply them with water occur due to contamination from paper scraps, limescale in the water, printing ink residue, and other contaminants. These contaminating particles penetrate the spray nozzles of the devices and can also clog the internal cavities of the water lines.

[0066] According to the present disclosure, no pre-wash step is required in the cleaning of the printing system 1 in which the rubber blanket cylinder 3 is sprayed with water by a spray device 17a, 17b to remove paper residues and other water-soluble residues, since paper residues are dissolved by the cleaning agent composition of the present disclosure.

[0067] The cleaning agent composition of the present disclosure comprises at least one organic solvent for diluting and / or dissolving printing ink residues and at least one cellulose solubilizer configured to dissolve cellulose material, such as paper residues, from cylinders 2, 3, 4, and 5. The water spray step is therefore no longer required, meaning that spray devices 17a and 17b can be omitted. The cellulose solubilizer is designed to dissolve water-soluble cellulose paper residues. However, if water is added to the cleaning agent composition, the water evaporates, and the cleaning agent composition loses its ability to dissolve water-soluble contaminants. Therefore, replacing the water spray step by adding water to the cleaning agent composition is not an option.Instead, the cellulose solubilizer should be a product with a low volatile organic compound (VOC) content. The possible groups of compounds listed below, from which the cellulose solubilizer can be selected, are all low in VOCs.

[0068] The concentration of the cellulose solubilizer in the cleaning agent composition is between 0.05 and 20 wt.%, preferably between 0.06 and 15 wt.%, more preferably between 0.075 and 10 wt.%, and most preferably between 0.1 and 5 wt.%. The concentration of the cellulose solubilizer must be balanced against the concentration of the organic solvent(s). If the concentration of the cellulose solubilizer is higher than 20 wt.%, the ink solubility of the cleaning agent composition decreases. If the concentration of the solubilizer is too low, i.e., below 0.05 wt.%, the cleaning agent composition does not dissolve and remove paper residues satisfactorily.

[0069] The cellulose solubilizer can be any compound selected from the group consisting of compounds with an ethanolamine unit, glycol ethers, C2-C6 alkanediols, hydrophilic surfactants, superwetting agents, or a combination of such compounds.

[0070] Preferred hydrophilic surfactants are so-called superwetting agents, such as an amphoteric betaine, an anionic organic sulfate, or an amine oxide. These superwetting agents are powerful wetting agents, meaning that even a low concentration is sufficient to effectively dissolve cellulose material. The concentration of the superwetting agent in the detergent composition can be as low as 0.1% by weight. Other hydrophilic surfactants can also be used in the detergent composition as cellulose solubilizers.

[0071] The C2-C6 alkanediol can be, for example, propylene glycol, tetramethylenediol (butane-1,4-diol), or ethylene glycol. Ethylene glycol is the preferred C2-C6 alkanediol.

[0072] Examples of glycol ethers that can be used as cellulose solubilizers include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monophenyl ether, ethylene glycol monobenzyl ether, propylene glycol methyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol mono-n-butyl ether, dipropylene glycol methyl ether, phenoxyethanol, pentaethylene glycol monododecyl ether, and alkylene polyglycol ether.

[0073] The ethanolamine group is defined here as the - (N(CH2 CH2 OH)) - group and is represented in formula I.

[0074] The compound comprising an ethanolamine unit may, for example, be an alkanolamine or alkanolamide, preferably an ethanolamine or ethanolamide, most preferably triethanolamine or coconut diethanolamide.

[0075] It is understood that a combination of the various cellulose solubilizers presented herein may be used in the cleaning agent composition according to the present disclosure.

[0076] The organic solvent component of the cleaning agent composition may, for example, be distillates (hydrogenated light oil) D100, isooctyl laurate, 2-ethylhexyl laurate, a propylene glycol oligomer, an unsaturated fatty acid, an ester such as a fatty acid ester, preferably a saturated fatty acid alkyl ester, a plasticizer, a petroleum-based solvent such as naphthene or paraffin, or a combination thereof, or any other organic solvent that dissolves printing ink residues.

[0077] The plasticizer reduces the swelling of the rubber sheet 3'. A preferred plasticizer is diisononyl phthalate (DINP), which also improves the cleaning performance of the detergent composition and reduces the amount of chemical residue on the rubber sheet cylinder 3 after washing.

[0078] The propylene glycol oligomer can be, for example, tri(propylene glycol)propyl ether, tri(propylene glycol)methyl ether, tri(propylene glycol)butyl ether, propylene glycol propyl ether, tripropylene glycol, propylene glycol diacetate, ethylene glycol monophenyl ether, di(propylene glycol)propyl ether, di(propylene glycol)methyl ether, di(propylene glycol)dimethyl ether or di(propylene glycol)butyl ether.

[0079] The fatty acid can be, for example, myristoleic acid, vaccenic acid, elaidic acid, linoleic acid, palmitoleic acid, sapienic acid, oleic acid, arachidonic acid, eicosapentaenoic acid, erucic acid or docosahexaenoic acid.

[0080] The organic solvents used in the cleaning agent composition are low in VOCs to avoid unwanted solvent evaporation.

[0081] The concentration of the organic solvent in the cleaning agent composition is between 80 and 99.05 wt.%, preferably between 85 and 99.04 wt.%, more preferably between 90 and 99.025 wt.% and most preferably between 95 and 99.9 wt.%.

[0082] Other possible compounds included in the cleaning fluid with different properties could be, for example, aliphatic hydrocarbons for cleaning power, vegetable esters for cleaning power and reducing evaporation, corrosion inhibitors to prevent corrosion, and emulsifiers for emulsification with water.

[0083] In one embodiment, the cleaning agent composition comprises an unsaturated fatty acid, a propylene glycol oligomer and a cellulose solubilizer, preferably coconut diethanolamide.

[0084] In another embodiment, the cleaning agent composition comprises distillates (hydrogenated light oil) D100, isooctyl laurate, 2-ethylhexyl laurate and a cellulose solubilizer, preferably coconut diethanolamide.

[0085] In a further embodiment, the cleaning agent composition comprises an ester, preferably a saturated fatty acid alkyl ester, a plasticizer, preferably diisononyl phthalate (DINP), and a cellulose solubilizer, preferably coconut diethanolamide. The preferred weight fractions of the ester, the plasticizer, and the cellulose solubilizer in this embodiment are 30 to 50 wt.% of the ester, 40 to 60 wt.% of the plasticizer, and 1 to 5 wt.% of the cellulose solubilizer. Most preferably, the cleaning agent composition comprises approximately 40 wt.% of the ester, approximately 57 wt.% of the plasticizer DINP, and approximately 3 wt.% of the coconut diethanolamide.

[0086] In another embodiment, the cleaning agent composition comprises a petroleum-based solvent, such as naphthene or paraffin, and a cellulose solubilizer, preferably coconut diethanolamide.

[0087] The cleaning agent composition further comprises less than 2 wt% water, for example, less than 1 wt% water or less than 0.5 wt% water. A water content of more than 2 wt% causes the cleaning agent composition to evaporate and dilutes the concentration of the cellulose solubilizer and the organic solvent, which impairs the cleaning agent composition's ability to dissolve printing ink and paper residues from the rubber plate 3'.

[0088] The content of organic solvent and cellulose solubilizer in the cleaning agent composition according to the present disclosure is 98% by weight or more.

[0089] Prefabricated cleaning rollers with a basic structure are known in engineering and are described, for example, in publication US 5 368 157 A.

[0090] According to the present disclosure, the cleaning textile 13 is a liquid- or solvent-absorbing material, such as a nonwoven fabric, and is designed to be impregnated or soaked with the cleaning agent composition of the present disclosure before the start of a cleaning process. Preferably, the cleaning textile 13 is impregnated or soaked with the cleaning fluid of the present disclosure before packaging and storage or transport; that is, it can be impregnated or soaked long before its use in a cleaning process. Furthermore, the cleaning textile 13 can be impregnated or soaked either before or after wrapping the core 14.

[0091] The in Fig.The cleaning roll 12 shown in Figure 3 is pre-packaged and stored until it is used in the cleaning process. The cleaning roll 12 is vacuum-packed until the bag 15 is opened before the start of a cleaning process. The vacuum packaging process is usually carried out by heat sealing. A multi-layered plastic film of the wrapping prevents the cleaning agent composition from evaporating. In addition, the vacuum packaging of the roll 12 prevents the cleaning agent composition from migrating or diffusing through the cleaning textile 13. Undesired diffusion in the cleaning textile 13 leads to an uneven distribution of the cleaning agent composition and thus to a poor and uneven cleaning result.

[0092] Before the cleaning process begins, the cleaning roll 12 is removed from its packaging or bag 15, as shown in Fig.4 shown, and arranged on the receiving device 11 in the cleaning cassette 10.

[0093] The cleaning cassette 10 is then moved from a rest position, in which the cleaning textile 13 is not in contact with the rubber plate 3' of cylinder 3, to an active position, in which it is in contact with the rubber plate 3' of cylinder 3. The cleaning cassette 10 can also be brought into contact with other cylinders of the printing system, such as the printing cylinder 2. Cylinders 2, 3, 4, 5, and 6 are rotated in the opposite direction to when the printing system is used for printing. The cleaning agent composition is thus transferred from the cleaning textile 13 to the rubber plate 3' of cylinder 3 and then to the other cylinders 2, 4, 5, and 6 of the printing system 1.

[0094] The cellulose solubilizer contained in the cleaning composition, with which the cleaning textile 13 is impregnated, dissolves and removes paper residues and other water-soluble contaminants, such as calcium carbonate. Therefore, it is not necessary to spray the rubber plate 3' with water before cleaning the system 1 with the cleaning cassette 10, and the spray bars 17a, 17b can be omitted.

[0095] Other components of the cleaning agent composition, such as organic solvents, dissolve and remove printing ink residues on cylinders 2, 3, 4, 5.

[0096] After the cleaning process is complete, the printing system 1 rotates cylinders 2, 3, 4, 5 and dampening rollers 6 in the printing direction. This is the opposite direction to that used during the washing process. The dampening rollers 6 transfer water from the water bath 9 to the printing cylinders 2, 3, 4, 5, and the cleaning agent composition used to clean the printing cylinders 2, 3, 4, 5 is diluted and finally removed from the printing system 1.

[0097] The pre-packaged roll 12, which contains the cleaning agent composition of the present disclosure, can be used in already functioning printing systems 1 that use a cleaning cassette 10 as described and have a spray device 17a, 17b. The spray device 17a, 17b can be easily switched off or closed, and the new pre-packaged roll 12 can be installed on the receiving device 11, thereby replacing the spray step of the washing process.

[0098] In one embodiment (not shown), the cleaning agent composition can be sprayed onto a dry cleaning textile before the cleaning process begins. The cleaning process can then be carried out as described above without the need for a water spray step to dissolve the paper residue on the rubber blanket cylinder.

[0099] In another embodiment (not shown), the cleaning agent composition can be sprayed directly onto the rubber blanket cylinder. The cleaning process can then be carried out as described above, without the need for a water spray step to dissolve the paper residue on the rubber blanket cylinder. EXPERIMENTS

[0100] The inventor has surprisingly found that adding a cellulose solubilizer to a cleaning agent composition is an effective replacement for the commonly used first washing step, in which water is sprayed onto the rubber plates 3' of the printing cylinder 3. The cellulose solubilizer is selected from the group consisting of a hydrophilic surfactant, a super-wetting agent, a C2-C6 alkanediol, a glycol ether, a compound comprising an ethanolamine group, or a combination thereof. An exemplary cleaning agent composition comprising a cellulose solubilizer is given in Table 1a.

[0101] The new cleaning agent compositions containing the cellulose solubilizer meet the requirements for a cleaning agent composition, as illustrated by the experiments presented below. Favorable properties of a cleaning agent composition include the solubility of printing ink, minimal swelling of the rubber plate 3' upon contact with the cleaning agent composition, and the dissolution of cellulose paper residues from the rubber plate 3'. The results are presented below in Tables 2 and 3 and in the Fig. 5 and Fig. 6 shown. Example 1

[0102] The three organic solvents distillates D100, isooctyl laurate and 2-ethylhexyl laurate form the cleaning agent composition A (CC A ), which is shown in Table 1 below.

[0103] An example of a cleaning agent composition according to one embodiment is shown below in Table 1a. The exemplary cleaning agent composition according to one embodiment of the present disclosure comprises three organic solvents (distillates D100, isooctyl laurate, 2-ethylhexyl laurate) and a cellulose solubilizer (coconut diethanolamide).

[0104] The total concentration of the three organic solvents is 95% by weight. The cellulose solubilizer (CS) in the illustrated embodiment is coconut diethanolamide. The concentration of the coconut diethanolamide is 5% by weight. Table 1 - Composition of cleaning agent composition A (CCA) Chemical ingredient Concentration (wt%) CC A Distillates (hydrogenated light oil) D100 75 Isooctyl laurate / 2-ethylhexyl laurate 25

[0105] Table 1a - Composition of a cleaning agent composition according to an embodiment of the present disclosure, which includes the three organic solvents from CC Aand includes a cellulose solvent (CS). Chemical ingredient Effect concentration (wt.%) CC A Distillates (hydrogenated light oil) D100 Solvent - dissolves printing ink residues 75 Isooctyl laurate Solvent - dissolves printing ink residues 10 2-Ethylhexyl laurate Solvent - dissolves printing ink residues 10 CS Coconut diethanolamide Cellulose solvent - dissolves paper residue 5 Experiment 1 - Swelling capacity of the rubber plate 3'

[0106] When using a cleaning agent in a printing system, one requirement for the cleaning agent composition is that it does not cause the rubber mat 3' on the blanket cylinder 3 to swell. If the rubber mat 3' swells excessively, the pressure between the rubber mat 3' on the blanket cylinder 3 and the printing cylinder 2 becomes too high, which, for example, leads to poor print quality.

[0107] The test is performed by removing a portion of the rubber material used for the rubber plate in the printing system and placing it on a flat surface (not shown). The rubber material is approximately 2 mm thick. A hollow, bottomless cup is placed on the rubber material and filled with the cleaning agent composition to be tested (not shown). The cleaning agent composition is left in the cup at a specific temperature (here, 40 °C) for a predetermined time (here, 24 hours). The thickness of the rubber plate material outside the cup is measured and serves as the reference height. The height of the area of ​​the rubber plate material in contact with the cleaning agent composition is also measured. Finally, the difference between the two heights is calculated as a percentage of the reference height.

[0108] The test results for the cleaning agent composition CC AThe results for a cleaning agent composition according to Table 1 and for a cleaning agent composition according to the embodiment of Table 1a are shown below in Table 2. The test results for another cleaning agent composition CC are shown below. B and CC B Cleaning agents with the addition of a cellulose solubilizer (coconut diethanolamide) are also listed in Table 2 below. The cleaning agent composition CC B comprises an unsaturated fatty acid and a propylene glycol oligomer.

[0109] The cleaning agent compositions remained in contact with the rubber sheet material for 24 hours at 40 °C. Initially, the cleaning agent compositions CC were used. A and CC B Tested without the addition of a cellulose solubilizer. The swelling capacity of the rubber sheet material then corresponded to 1.42 and 1.97, respectively, as can be seen in Table 2. After adding 5% coconut diethanolamide to CC AThe swelling capacity increased only slightly to 1.59%, and after adding 5% coconut diethanolamide to CC B The swelling capacity increased to 2.59%. Both values ​​(1.59 and 2.59) are below the threshold for an acceptable swelling capacity of the rubber sheet material. Table 2 - The test results from the source test. Swelling test rubber mat (24 h) , 40 °C) % altitude gain CC A 1,42 CC A + 5 % Kokosnuss-Diethanolamid 1,59 CC B 1,97 CC B + 5 % Kokosnuss-Diethanolamid 2,59 Experiment 2 - Solubility of printing ink

[0110] The addition of the water substitute should not reduce the ink solubility of the cleaning agent. If the ink solubility decreases, there is a risk that the cleaning agent will not be able to efficiently remove the ink residue from the printing cylinders during the cleaning process.

[0111] The result of the printing ink solubility test is in Fig. 5 shown. On the left side of Fig. 5 are two cups B1 and B2 with the cleaning agent composition CCA The containers are filled. The leftmost container, B1, also contains an additive of 5% cellulose solubilizer (coconut diethanolamide). The two containers on the right, B3 and B4, contain the cleaning agent composition CC. B The left cup B3 of the two cups, the CC B It also contains an additive of 5% cellulose solubilizer (coconut diethanolamide).

[0112] During the test, a substrate covered with red printing ink is immersed in the beaker containing the cleaning agent. The substrate is then removed from the beaker and placed on a paper towel. The solubility is visually assessed by observing the amount of printing ink on the substrate that has been dissolved by the cleaning agent.

[0113] In Fig.In step 5, substrates S1, S2, S3, and S4 are positioned in front of the beaker into which they were immersed. Of the two substrates that were immersed in the cleaning agent composition CC... A After immersion, more printing ink was dissolved on the left substrate S1 than on the right substrate S2. This means that the cleaning agent composition CC A with 5% coconut diethanolamide, it has a higher solubility than the cleaning agent composition CC. A without the addition of the cellulose solubilizer coconut diethanolamide.

[0114] Right in Fig. 5 More printing ink was dissolved from substrate S3, which was added to the cleaning agent composition CC. B was dipped in 5% coconut diethanolamide (the substrate on the left S3 of the two substrates on the right side in Fig. 5). Therefore, the cleaning agent composition CC also exhibits BThe cleaning agent composition with an addition of 5% coconut diethanolamide exhibits a higher solubility of printing inks than the cleaning agent composition without the addition of 5% coconut diethanolamide. Experiment 3 - Paper Residue Wash Test

[0115] To evaluate the dissolution of paper residues from the rubber sheet material, a paper residue and printing ink wash test was performed.

[0116] An unwashed rubber sheet cloth 19 of the same type as the rubber sheet 3', covered with printing ink and paper residues, was placed on a flat surface. Cleaning agent compositions with varying concentrations of a cellulose solubilizer (coconut diethanolamide and triethanolamine) were applied to different cloths C1, C2, C3, C4, and C5, which were then brought into contact with the soiled rubber sheet cloth 19. The cloths C1, C2, C3, C4, and C5 were then manually dragged across the surface five times.

[0117] The in Fig. Figure 6 shows the amount of printing ink and paper fibers that cloths C1, C2, C3, C4, and C5 removed from the rubber plate cloth material. A darker ink color on the cloth indicates that more ink and paper residue was dissolved and removed from the rubber plate material. The result of the experiment is shown in Fig. Figure 6 is shown. Table 3 shows the different water substitutes that were tested in the washing test. Table 3 - The table shows the five tests that were carried out in the paper residue wash test. Wash test Cellulose solvents Concentration (wt%) WT1 Coconut diethanolamide 5 WT2 Control (no water substitute used) - WT3 Triethanolamine 5 WT4 Coconut diethanolamide 10 WT5 Coconut diethanolamide 1

[0118] The results show that a concentration of 5 wt% of the cellulose solvent yielded the best results. The results of tests WT1 and WT3 show a darker cloth (C1 and C3, respectively) after repeated washing of the rubber plate 19, indicating that they dissolved more ink and paper residue than the other cloths. The control test WT2 showed that cloth C2 had the least dark coloration and therefore dissolved the least amount of ink and paper residue of all cloths C1, C2, C3, C4, and C5. Thus, a cleaning agent composition according to the present disclosure performs better in a washing test. clauses

[0119] In one clause, a roll of cleaning textile is provided for cleaning printing cylinders of a printing system, wherein the cleaning textile is impregnated with a cleaning agent composition, the cleaning agent composition comprising an organic solvent and a cellulose solubilizer.

[0120] In a further clause, the cleaning agent composition comprises less than 10 wt.% water, preferably less than 5 wt.% water.

[0121] One clause states that the cleaning agent composition contains less than 2% water by weight.

[0122] In another clause, the cellulose solubilizer includes an ethanolamine group.

[0123] In one clause, the cellulose solubilizer comprising the ethanolamine unit is an ethanolamide.

[0124] In one clause, the ethanolamide is coconut diethanolamide.

[0125] In one clause, the cellulose solubilizer comprising the ethanolamine unit is an ethanolamine.

[0126] In another clause, ethanolamine is triethanolamine.

[0127] In one clause, the cellulose solubilizer is a glycol ether.

[0128] In one clause, the cellulose solubilizer is a C2-C6 alkanediol.

[0129] In one clause, the C2-C6 alkanediol is ethylene glycol.

[0130] In one clause, the cellulose solubilizer is a hydrophilic surfactant.

[0131] In one clause, the hydrophilic surfactant is a superwetting agent, preferably an amphoteric betaine, an anionic organic sulfate or an amine oxide.

[0132] In a further clause, the content of the cellulose solubilizer in the cleaning agent composition is between 0.05 and 20 wt.%, preferably between 0.075 and 10 wt.% and most preferably between 0.1 and 5 wt.%.

[0133] In one clause, the organic solvent content is between 80 and 99.05 wt.%, preferably between 90 and 99.025 wt.% and most preferably between 95 and 99.9 wt.%.

[0134] In one clause, the cleaning textile 13 is wrapped around a core 14 to form the roll 12.

[0135] In a further clause, the roll 12 is inserted into a removable sealing bag 15, which is designed to seal the roll 12 of cleaning textile 13 to prevent the cleaning agent composition from evaporating before use.

[0136] In another clause, the roll 12 of cleaning textile 13 is vacuum-packed in the sealing bag 15.

[0137] Another clause provides a cleaning agent composition comprising an organic solvent and a cellulose solubilizer.

[0138] In a further clause, the cleaning agent composition comprises less than 10 wt.% water, preferably less than 5 wt.% water.

[0139] And in another clause, the cleaning agent composition includes less than 2% water by weight.

[0140] In one clause, a cleaning textile is provided for cleaning printing cylinders of a printing system, wherein the cleaning textile is impregnated with a cleaning agent composition, the cleaning agent composition comprising an organic solvent and a cellulose solubilizer.

[0141] In a further clause, the cleaning agent composition comprises less than 10 wt.% water, preferably less than 5 wt.% water.

[0142] In another clause, the cleaning agent composition includes less than 2% water by weight.

[0143] In one clause, a method for cleaning a printing cylinder of a printing system is provided using a roller as described in one of the clauses above; the method comprising the following steps: unwinding at least a portion of the cleaning textile 13, impregnated with a cleaning agent composition as defined in one of the clauses above relating to the cleaning agent composition, from the roller 12; and bringing the portion of the cleaning textile 13 into contact with the printing cylinder 3.

[0144] A clause provides a procedure for forming a role as defined in one of the above clauses describing the role, the procedure comprising the following steps: - Soaking a cleaning textile 13 with the cleaning agent composition as defined in one of the above clauses relating to the cleaning agent composition; - Wrapping the cleaning textile 13 around a core 14 to form a roll 12; and - Placing the roll 12 into a sealable bag 15, which is preferably vacuum-packed.

[0145] In another clause, the cleaning textile 13 is soaked with the cleaning agent composition after it has been wrapped around the core 14.

[0146] Another clause provides for the use of a roll of cleaning textile, as specified in one of the above clauses relating to the cleaning textile, for cleaning printing cylinders of a printing system.

[0147] Finally, although the inventive concept was described above with reference to certain embodiments, it is not intended to be limited to the specific form presented here. Rather, the invention is only limited by the appended claims, and embodiments other than those mentioned above are equally possible within the scope of these appended claims. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 7 219 605 B2

[0002] US 2005 250 659 A1

[0003] EP 4 352 69 A1

[0005] EP 878 304 A1

[0005] US 5 340 495 A

[0005] GB 1 365 464 A

[0005] US 5 368 157 A

[0089]

Claims

Roll of a cleaning textile for cleaning printing cylinders of a printing system, wherein the cleaning textile is impregnated with a cleaning agent composition, the cleaning agent composition comprising an organic solvent and a cellulose solubilizer, wherein the organic solvent is a propylene glycol oligomer, which is di(propylene glycol)propyl ether, and wherein the roll (12) is inserted into a removable sealing bag (15) configured to seal the roll (12) of cleaning textile (13) to prevent the cleaning agent composition from evaporating prior to use, wherein the sealing bag (15) is tubular and constructed of a multilayer plastic film. Roller according to claim 1, wherein the cleaning agent composition comprises less than 10 wt.% water, preferably less than 5 wt.% water and most preferably less than 2 wt.% water. Roller according to claim 1 or 2, wherein the cleaning agent composition comprises aliphatic hydrocarbons for cleaning power. Roller according to one of claims 1 to 3, wherein the cleaning agent composition comprises a plasticizer, preferably diisononyl phthalate (DINP). Roll according to one of the preceding claims, wherein the cleaning textile (13) is wound around a core (14) to form the roll (12). Roll according to one of the preceding claims, wherein the roll (12) made of cleaning textile (13) is vacuum-packed in the sealing bag (15). Cleaning agent composition comprising an organic solvent and a cellulose solubilizer, wherein the organic solvent is a propylene glycol oligomer, which is di(propylene glycol) propyl ether. Cleaning agent composition according to claim 7, wherein the cleaning agent composition comprises less than 10 wt.% water, preferably less than 5 wt.% water and most preferably less than 2 wt.% water. Cleaning textile for cleaning printing cylinders of a printing system, wherein the cleaning textile is impregnated with a cleaning agent composition according to claim 7 or 8. Cleaning system for cleaning a printing cylinder of a printing system by means of a roller according to any one of claims 1 to 6, wherein the system is configured to: - remove the roller (12) from its sealing bag (15); - unwind at least a part of the cleaning textile (13) impregnated with a cleaning agent composition according to any one of claims 7 to 8 from the roller (12); and - bring the part of the cleaning textile (13) into contact with the printing cylinder (3). System for forming a roll according to claims 1 to 6, wherein the system is configured to: - impregnate a cleaning textile (13) with the cleaning agent composition according to one of claims 7 to 8; - wrap the cleaning textile (13) around a core (14) to form a roll (12); and - insert the roll (12) into a sealable bag (15), which is preferably vacuum-packed, and wherein the cleaning textile (13) is optionally impregnated with the cleaning agent composition after it has been wrapped around the core (14).

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