DE202011106154U1 - Textile fabric - Google Patents

Abstract

Textile sheet-like structure, in particular absorbent and / or porous sheet-like structure, preferably for cleaning printing machine parts and / or printing machine accessories, in particular printing cylinders and / or impression cylinders and / or printing blankets, wherein the textile sheet-like structure has a composition applied to it, in particular impregnated, the composition ( a) at least one solvent, (b) at least one rheology modifier, (c) optionally at least one adhesion promoter and (d) optionally at least one surfactant.

Description

The present invention relates to the field of printing technology.

In particular, the present invention relates to a textile fabric which is preferably suitable for cleaning printing press parts and / or printing press accessories, in particular printing cylinders and / or printing blankets.

Moreover, the present invention relates to the use of the textile fabric according to the invention for cleaning printing press parts and / or printing press accessories, in particular printing cylinders and blankets.

Furthermore, the present invention relates to a composition which is particularly suitable for applying a textile fabric for cleaning printing press parts and / or printing press accessories.

Finally, the present invention relates to the use of the composition according to the invention for cleaning printing press parts and / or printing machine accessories, in particular printing cylinders and blankets, and a method for cleaning printing machines and / or printing press accessories, in particular printing cylinders or blankets, using this composition.

When reproducing or duplicating originals by means of printing processes color or toner residues always remain on the printing presses or printers - regardless of whether the reproduction or duplication of the original by means of a classical printing process, such as high-pressure, planographic, gravure or print, or by means of an electronic printing process, such as ink-jet printing.

The color and toner residues, however, have an adverse effect on the print quality, which is why the respective parts of the printer or printing press, which come into contact with the colors or the toner in contact, must be cleaned or replaced at regular intervals to a consistently good To ensure print quality.

The removal of the color or toner residues should on the one hand as completely as possible, but on the other hand be carried out as quickly as possible and with little effort so that the cleaning as such can be made as time and cost saving and longer life of the printer or the printing press can be avoided ,

A particularly simple and inexpensive cleaning method for the removal of ink and toner residues from printers or printing machines is to use the usual printing process, but without paint application instead of the substrate - usually paper - a special cleaning cloth or cleaning paper:
That's how it describes DE 91 16 242 U1 a cleaning device for a printing or copying machine operating in the transfer printing method, wherein a band-shaped cleaning fleece is inserted instead of the recording medium in the transfer station and transported via the usual transport means, with dirt and ink residues remain adhered to the cleaning fleece.

Furthermore, the disclosure DE 600 31 075 T2 a specially coated cleaning paper that can be used to clean the rubber rollers of printers or fax machines.

Such a simple cleaning, however, is apparently not possible in many industrially carried out printing processes, for example for printing in front of newspapers and magazines, due to the printing inks used and the high process speed, which leads to a low contact time between printing substrate and the ink-transferring parts of the printing press. In particular, these cleaning methods are not possible with the offset printing method often used in the industrial or professional field.

The offset printing process is an indirect lithographic printing process in which the ink is not transferred directly from the printing plate to the substrate; Rather, the ink is transferred from a generally cylindrical printing plate or printing plate to a rubber blanket ("blanket") and applied by this to the substrate.

The basis of the offset printing is the different wetting behavior of oleophilic and hydrophilic on the areas of different surface structures of the printing plate.

The invention described below generally relates to the cleaning of rubber blankets in offset printing, in particular a washing solution or composition for washing nonwovens and the washable nonwovens obtainable in this way and their use.

In particular, offset printing is based on the fact that the generally organically based or oil-based paint on the one hand and water on the other repel each other. The image parts are oleophilic and can be the medium, d. H. the ink, while the non-image parts are hydrophilic and can accept the fountain solution. The inked image parts transfer the color to a cylinder on which a cloth, which usually consists of a rubber / fabric mixture, the so-called rubber blanket ("blanket"), is stretched. From this rubber blanket turn the color is then transferred to the substrate, usually paper.

The rubber blanket must be washed or cleaned regularly due to the work process. It removes paint and paper residues such as dust and fibers.

This can be done manually or mechanically or automatically. Today, automated or automated cleaning is commonly used. Various methods and devices for the mechanical cleaning of the printing cylinders or impression cylinders and printing blankets are currently commercially available.

A common version is cleaning with a dry nonwoven cloth, which is sprayed alternately with a special detergent and with water. The equipment required for this purpose, however, on the one hand consuming to maintain and on the other hand costly to buy.

An equally common cleaning process with pre-soaked washing fleeces is cheaper to buy and requires little regular care. The commonly used and commercially available pre-soaked washing fleeces are generally soaked with a simple solvent mixture ("washing solution"). A disadvantage of these washing nonwovens is often that the amount of washing fleece roll for the washing solution is very limited. In particular, due to the different pore sizes of different nonwoven fabrics, there may be undesirable fluctuations in the absorption capacity and in the dispensing behavior of the washing nonwovens. It can also come to dripping of the washing solution in the printing press, which adversely affects the printing process, in particular deteriorates the print quality and increases the proportion of waste. Gravity-induced (gravimetric) migration or sinking of the washing solution can also lead to uneven washing processes.

Due to the efficiency and economic importance of the offset printing process, there have been a number of attempts to improve the cleaning of printing machines, in particular the printing cylinder, impression cylinder and rubber blankets of printing presses, for offset printing.

That's how it describes DE 100 03 161 A1 an apparatus and a method for producing a cleaning fleece impregnated with a cleaning liquid, which can be used for cleaning the surfaces of rubber pressure cylinders of planographic printing machines. In the course of the process, the cleaning fleece is moistened with the cleaning liquid and then excess cleaning liquid is stripped off on a stripping device. In this way, the formation of spray mist is to be prevented in the cleaning of the rubber pressure cylinder, as these are on the one hand potentially hazardous to health and on the other hand lead to a lasting contamination of the printing press due to the entrained or dissolved paint residues. Although the stripping of excess cleaning liquid can prevent the formation of spray during cleaning, but is not for the production of storage stable, pre-soaked or wetted cleaning nonwovens usable and also can not prevent dripping of the cleaning liquid during the cleaning process.

The US 5,368,157 A relates to a packaged pre-saturated cleaning system for cleaning cylinders of presses. The cleaning system includes a pre-soaked fabric roll which is impregnated with a cleaning solution based on a low-volatility organic solvent and wound around a cylindrical core. The pre-soaked wound fabric tape is packaged in a heat-sealable and heat-shrinkable wrapper, the pressure of the heat-shrinkable wrapper being intended to maintain a stable cleaning system over a longer period of time. However, it is also with the cleaning system described in US Pat. No. 5,368,157 A, it is not possible to obtain a storage-stable cleaning system, since the cleaning solution always sinks downwards under the influence of gravity, so that a uniform wetting or impregnation of the fabric with the cleaning solution is no longer present. It can therefore come in the application to a spray or dripping of the cleaning solution in the printing press.

Finally, that describes DE 695 26 427 T2 a packaged cleaning device for the cylinder of a printing press of a porous sheet material. The porous web material or the cloth is calendered, wound under tension and then impregnated with a cleaning liquid. By calendering and winding under tension, the web material is to be compressed and its air content reduced, whereby a sinking of the cleaning liquid is to be prevented by the action of gravity when the wound and impregnated fabric web is provided with a shrunk-wrap. In this way, however, no long-term stable storable packaging of a pre-impregnated cleaning cloth for cleaning rubber blankets and printing cylinders of offset printing machines is possible.

Simple wash solutions also have the disadvantage that they only dissolve the paint, but do not emulsify or disperse larger paint residues or particles, which in turn makes it difficult to remove the residue on the blanket.

The present invention is therefore based on the object to provide a textile fabric and a method for cleaning printing press parts or printing press accessories, the above-described, occurring in connection with the prior art problems and disadvantages should be at least largely avoided or at least mitigated.

In particular, it is an object of the present invention to provide a fabric which is applied or impregnated with a composition, wherein compared to textile fabrics, in particular cleaning wipes or non-wovens, of the prior art significantly improved cleaning performance in particular a machine or automated cleaning of printing cylinders, impression cylinders and blankets of planographic printing machines, especially printing machines for offset printing to achieve.

A further object of the present invention is to provide a novel cleaning composition ("wash solution") which increases the uptake potential of washcloth rolls, reduces uneven distribution of the wash solution and ensures even filling of the pores of the wash webs even at different sizes and beyond an improved emulsification or dispersion of paint, paper and other residues from the printing process should be possible.

The above-described task is inventively achieved by a textile fabric according to claim 1; Further, advantageous developments and refinements of the textile fabric according to the invention are the subject of the relevant subclaims.

Another object of the present invention is the use of the textile fabric according to the invention for cleaning printing press parts or printing press accessories.

Yet another object of the present invention is the use of a composition for cleaning printing press parts and / or printing press accessories.

Another object of the present invention is a method for cleaning printing press parts and / or printing press accessories.

Finally, another object of the present invention is a composition according to claim 10.

It goes without saying that embodiments, embodiments, advantages or the like, which are subsequently - for the purpose of avoiding unnecessary repetition - executed only on one aspect of the invention, of course, also apply accordingly with respect to the other aspects of the invention.

Furthermore, it goes without saying that in the case of subsequent statements of values, numbers and ranges, the values, numbers and ranges given in this context are not to be understood as limiting; it is obvious to the person skilled in the art that, on a case-by-case basis or application-related, of the can be deviated from without departing from the scope of the present invention.

In addition, it is true that all the values or parameter information or the like mentioned below can in principle be determined or determined using standardized or explicitly stated determination methods or determination methods which are familiar per se to the person skilled in the art.

Having said that, the present invention will be described in more detail below.

• (a) mindestens ein Lösemittel
• (b) mindestens ein Rheologiemodifizierer
• (c) gegebenenfalls mindestens einem Adhäsionsverstärker und
• (d) gegebenenfalls mindestens ein Tensid

umfasst.The present invention - according to a first aspect of the present invention - is thus a textile fabric, in particular an absorbent or porous fabric, which is particularly suitable for cleaning printing press parts and / or printing machine accessories, such as printing cylinders, impression cylinders and blankets, wherein the textile fabric is provided with a composition, in particular impregnated, and the composition

• (a) at least one solvent
• (b) at least one rheology modifier
• (c) optionally at least one adhesion promoter and
• (d) optionally at least one surfactant

includes.

The textile fabric according to the invention is outstandingly suitable for cleaning printing press parts, in particular printing cylinders, counter-pressure cylinders and printing blankets or blanket blankets, as used in offset printing processes.

In the context of the present invention, a flat, d. H. a quasi-two-dimensional structure, be understood whose expansion in a spatial direction opposite to the expansion in the other two spatial directions is negligible and which consists of a textile, wherein the textile z. B. from a textile raw material by means of conventional textile technologies, such as weaving, knitting, etc., can be produced.

The textile fabrics of the invention are generally absorbent or porous.

In the context of the present invention, porous means in particular that the spaces between the individual fibers or threads or yarns from which the textile fabrics according to the invention are constructed form pores, so that the textile fabric as such has a porous and, in particular, gas-permeable structure.

In the context of the present invention, the term absorbency should be understood as meaning, in particular, the ability to take up or sorb in particular liquid compositions, such as, for example, solutions or dispersions. The sorption of the composition can be effected in particular by incorporation into the cavities of the pores and / or by adsorption on the porous structure and / or by capillary forces in small pores or between individual fibers within the fiber bundles or threads or yarns. The absorbency of the textile fabric according to the invention should in particular be dimensioned such that the textile fabric, in particular, can absorb liquid composition well on the one hand and keep it stable on the other hand, but also allow adequate wetting of the printing machine parts during cleaning.

In addition to a preferably low-volatility solvent, the composition used according to the invention, which is applied to the textile fabric, contains at least one rheology modifier. In the context of the present invention, a "rheology modifier" is to be understood as meaning a substance which exhibits the rheology of the composition d. H. their physical nature or consistency and viscosity, influenced. The targeted adjustment of the rheology or viscosity can be achieved in the present invention that a sputtering of the (cleaning) composition is omitted during the cleaning process, whereby contamination of the printing machine, in particular the sensors of light barriers within the printing machine, by dissolved or emulsified dye residues and a possible health hazard to workers can be avoided by aerosols.

It has surprisingly been found that by improving the rheology and adhesion of the composition, in particular the washing solution, and optionally additional wetting agents, improved washing processes or an improved cleaning action can be achieved.

The necessary amount of cleaner (i.e., the amount of composition) on the printing machine part or printing blanket is very small, so that it can easily be removed again via the paper. This leads to a relatively low waste of waste in the production compared to conventional solvents and solvent mixtures.

In addition, the rheology modifier prevents dripping of the composition from the fabric, thereby also counteracting fouling of the printing press and a higher proportion of waste.

The rheology modifier also allows uniform wetting of the fabric with the composition and prevents the composition from sinking under the influence of gravity during storage. The fabric of the invention which has been impregnated or impregnated with the composition is thus stable on storage as a result of the use of a rheology modifier, i. H. The textile fabric of the invention can be used directly after a long storage time for cleaning printing presses or printing press parts without a deteriorated cleaning effect or dripping or even sputtering of the composition is observed. In the context of the present invention, the costly measures customary in the state of the art, such as compression of the textile fabric before impregnation or packaging of the pre-saturated cleaning fabric in a film under pressure, can be omitted without adversely affecting the cleaning effect and the storage stability become.

In addition, the composition used according to the invention, as described above, may advantageously contain at least one adhesion promoter. In the context of the present invention, an "adhesion promoter" is to be understood as meaning a surface-active substance which increases the "adhesion" of the composition to the fibers or threads and yarns of the textile fabric. By using an adhesion enhancer, the storage stability of the textile fabric according to the invention can again be markedly increased, with a particular synergistic effect being observed between the rheology modifier and the adhesion promoter.

Furthermore, the composition used according to the invention may equally contain at least one surfactant. In the context of the present invention, a "surfactant" is understood to mean a surface-active substance which makes it possible to disperse or emulsify ink residues or dust and paper residues adhering to the printing machine parts. Surfactants are synonymously also referred to as emulsifiers or dispersants and are often composed of long-chain hydrocarbons or polyethers which carry a polar chemical function at one end of the chain.

The use of surfactants leads in the context of the present invention, in particular to a significantly improved cleaning effect of the fabric according to the invention with a simultaneously lower quantitative loading of the textile fabric with the composition, whereby the use of the fabric according to the invention - in comparison to cleaning wipes or cleaning fleece of the State of the art - significantly cheaper and more environmentally friendly.

Consequently, the textile fabric according to the invention has a significantly improved cleaning effect compared with the prior art and leads to a significant waste of the waste, whereby the use of the textile fabric according to the invention a significant time and cost savings compared to cleaning methods with cleaning wipes or non-wovens State of the art allows.

Due to the improved cleaning effect, the cleaning can be carried out as such in a much shorter time, while at the same time can be significantly longer intervals between the individual cleanings. In this way, the production loss is also minimized, which in turn saves costs.

In general, the textile fabric is web-shaped. The textile fabric according to the invention is particularly suitable for automated or mechanical cleaning of printing press parts or printing press accessories, in particular printing and counter-pressure cylinders, such as rollers, and / or blankets, such as blankets in offset printing process.

Furthermore, it can be provided that the textile fabric is wound up into a roll, in particular onto a spindle or a cylinder. In particular, for automated or automated cleaning of offset printing machines, generally pre-soaked wipes, wound into a roll, are used, which are rolled up on a spindle or cylinder to ensure smooth rolling. In this way, even larger amounts of sheet material can be stored to save space and easily insert into a cleaning device.

Moreover, it has proved to be advantageous in the context of the present invention if the textile fabric is a woven fabric, a knitted fabric, a knitted fabric, a scrim, a nonwoven or a textile composite, preferably a nonwoven and / or a nonwoven , Particularly good results are obtained when the textile fabric is in the form of a nonwoven or a nonwoven, since these are on the one hand mechanically strong, d. H. have a high tensile strength, and on the other hand, the (cleaning) composition well record and controlled release again.

In addition, for a small number of applications it may be provided that instead of a textile fabric, a sheet-like sheet of paper is used. Such a cleaning cloth made of paper is mechanically less durable compared to a fabric and can also absorb only smaller amounts of (cleaning) compositions, but is much cheaper to buy. However, the use of fabrics made of a textile material is preferred in the context of the present invention.

As far as the nature of the material constituting the fabric is concerned, it may vary widely in the context of the present invention, which fabric may consist of natural or synthetic materials or mixtures thereof and / or of fibers, yarns and threads can be constructed. In particular, it is preferred that the threads or yarns also consist of fibers, whereby the absorption capacity of the textile fabric for the composition is markedly increased due to capillary action.

In the context of the present invention, it can thus be provided that the textile fabric comprises or consists of natural fibers, in particular mineral, animal and / or vegetable fibers. Particularly good results are obtained in particular when the natural fibers are selected from glass fibers, mineral wool, silk, wool, cotton and hemp fibers, the use of cotton over the other materials being preferred.

Likewise, it may be provided in the context of the present invention that the textile fabric comprises or consists of chemical fibers, in particular of natural and / or synthetic polymers. In this connection, particularly good results are obtained, in particular, when the chemical fibers are selected from cellulose fibers, cellulose regenerated fibers, polyamide fibers, polyester fibers, polyvinyl chloride fibers, polyolefin fibers (eg polyethylene fibers or polypropylene fibers), polyphenylene sulfide fibers, polyacrylonitrile fibers Polyimide fibers, polytetrafluoroethylene fibers, aramid fibers and polyamideimide fibers, preferably regenerated cellulose fibers and polyester fibers. In the context of the present invention, the term "cellulose regenerated fibers" is understood in particular to mean fibers of regenerated cellulose.

In the context of the present invention, however, preference is given to the use of blended fabrics of cellulose regenerated fibers and polyester fibers, since in this way the positive properties of the different materials ideally complement one another.

In addition, it has proven to be advantageous if the textile fabric has a basis weight of 20 to 400 g / cm ² , in particular 30 to 350 g / cm ² , preferably 35 to 300 g / cm ² , preferably 40 to 250 g / cm ² , particularly preferably 45 to 225 g / cm ² , very particularly preferably 50 to 200 g / cm ² . Textile fabrics with the above-mentioned basis weightings generally have on the one hand a good and sufficient absorption capacity for the composition, on the other hand, however, in the soaked or impregnated and wound state due to the small spatial extent and low total weight easily manageable and also mechanically stable ,

Particularly good results are obtained in the context of the present invention, when the fabric with 20 to 1200 ml, in particular 25 to 1000 ml, preferably 30 to 800 ml, preferably 35 to 600 ml, particularly preferably 40 to 500 ml of the aforementioned composition applied to m ^{2 of} the textile fabric, in particular impregnated, is. The textile according to the invention Consequently, fabrics can be applied or impregnated with extremely small amounts of (cleaning) composition and nevertheless have a higher cleaning action than comparable (textile) fabrics of the prior art. The textile fabric according to the invention also makes possible a significantly more efficient, ie time and resource-saving, cleaning of printing machine parts or printing press accessories, in particular in the offset printing sector.

The application of the textile fabric with the composition is generally carried out by means of spraying or impregnation.

In the spraying process, a previously metered, in particular only small amount of the composition is applied to the not yet wound up or rolled up textile sheet material. In this way, a particularly uniform application or impregnation of the textile fabric with precisely metered or small amounts of composition is possible. Equally, however, larger, previously metered amounts of composition can be applied to the fabric by means of spraying. By spraying a highly flexible and tailored to the particular application individually impingement or impregnation of the textile fabric with the composition is thus possible. However, common to all spraying methods is that the composition is applied to only a single layer of the textile fabric, i. H. should be applied to the not yet rolled or unwound or unfolded fabric.

By impregnation, however, preferably larger amounts of composition can be applied to the already wound or already rolled up web of textile fabric. Here, the already wound or rolled up textile sheet material is immersed in a bath in the composition, wherein the fabric "soaked" with the composition. Similarly, but also not yet wound, d. H. einlagige textile material can be applied by means of impregnation in the cleaning composition. As part of the soaking method, it is recommended that any excess composition be removed after soaking, for example by dripping or pressure on the fabric.

After the textile fabric has been subjected to the composition and the rolling up or winding up of the textile fabric, it is generally followed by a transport and storage-stable packaging of the textile fabric. Due to the special properties of the composition used according to the invention can be dispensed with a special packaging, in particular a heat-shrinkable packaging.

Care should be taken, however, that the packaging of the fabric impregnated with the composition is not absorbent, otherwise the composition may be transferred, at least in part, during storage, from the fabric to the package. On the one hand, this can lead to a reduced cleaning performance of the textile fabric and, on the other hand, to an undesirable leakage or leakage of the packaging.

As far as the chemical and physical properties of the composition with which the textile fabric is applied or impregnated, these can vary within wide ranges. In general, however, it is contemplated that the composition will be at a temperature of 25 ° C and at a pressure of 1.013 bar, i. H. under standard conditions, liquid and / or flowable, in particular liquid, is because a liquid composition can be taken up particularly well due to adhesion and capillary forces of the fabric and also controlled again can be discharged.

In addition, it has proven useful if the composition at a temperature of 20 ° C after DIN EN ISO 2431 certain dynamic viscosity in the range of 1 to 2,000 mPas, in particular in the range of 2 to 1,500 mPas, preferably in the range of 5 to 1,000 mPas, preferably in the range of 7 to 500 mPas, particularly preferably in the range of 10 to 250 mPas, very particularly preferably in the range of 15 to 150 mPas.

On the one hand, compositions with the abovementioned dynamic viscosities can completely wet the textile fabric and, on the other hand, adhere very well to the textile fabric, in particular owing to capillary forces. In addition, however, they are also "viscous" enough to prevent dripping of the composition during the cleaning process.

Furthermore, it is also largely prevented during transport or storage of the impregnated or impregnated textile fabric that the composition sinks under the influence of gravity and accumulates in the lower portion or region of the package or the textile fabric no longer uniformly wetted.

With regard to the quantitative coordination of the individual components of the composition, it should be noted that these can vary within wide ranges.

Good results are obtained, in particular, if the composition contains the solvent in amounts of 50 to 99% by weight, in particular 70 to 99% by weight, preferably 80 to 98% by weight, preferably 90 to 98% by weight, especially preferably 50 to 99 wt .-%, based on the composition contains. The composition used in the context of the present invention therefore consists mainly of the solvent or of solvent mixtures.

It may be provided that the solvent is selected from polar and nonpolar solvents or mixtures thereof.

Particularly good results are obtained when the solvent is selected from water, polar organic solvents, in particular ethers, polyethers, esters or alcohols, or nonpolar organic solvents, in particular aliphatic or aromatic hydrocarbons, and mixtures of the abovementioned solvents.

In particular, mixtures of polar and nonpolar solvents are preferred, since in this way both polar and non-polar substances can be equally well removed or dissolved; For example, non-polar paint residues are preferably dissolved by nonpolar solvents, whereas polar soils such as paper fibers or water-soluble contaminants are removed by polar solvents.

It has proven useful in the context of the present invention, when the solvent is especially selected from aliphatic hydrocarbons, monoesters, in particular fatty acid esters, glycol ethers, Dioctyladipat, diisobutyl, Diisobutylglucurat, Diisobutyladipat and water and mixtures thereof or combinations. The abovementioned solvents, in particular their combinations or mixtures, are outstandingly suitable for the cleaning of printing cylinders and rubber blankets as used in the offset printing process; The latter applies in particular because non-polar inks and water-based dampening solutions are used in the offset printing process.

In the context of the present invention, it is preferred if the solvent is substantially free of volatile organic compounds, in particular of organic constituents having a vapor pressure of more than 10,000 Pa at 20 ° C.

Likewise, it is particularly preferred according to the invention if the solvent has a boiling point of at least 100 ° C., in particular at least 150 ° C., preferably at least 200 ° C., at 1.013 bar.

The solvent or solvent mixture used according to the invention is thus essentially free of volatile organic compounds or VOC-free (volatile organic compounds). By dispensing with volatile organic compounds or components as solvents or in the solvent mixtures, the composition used according to the invention has an extremely low environmental impact and is not harmful to health. In addition, a possible risk of explosion, which emanates from the contact of volatile organic components or solvents with hot machine parts, minimized or eliminated. Moreover, because of the very high boiling point VOC-free mixture, evaporation is minimal, which is why special packaging, such as a solvent-containing film package or special shrink-film packaging, is not necessary for this reason.

As stated above, the composition used according to the invention also contains at least one rheology modifier in addition to at least one solvent. The rheology modifier allows a precise adjustment of the consistency or viscosity of the composition used in the invention, which in the context of the present invention, compositions are accessible which do not drip on the one hand when using the fabric and also not sputtering and so to a contamination of the printer or lead the printing presses, on the other hand, however allow complete wetting of the textile fabric and a suction of the composition through the fabric.

Particularly good results are obtained within the scope of the present invention if the composition contains the rheology modifier in amounts of 0.01 to 20% by weight, in particular 0.05 to 15% by weight, preferably 0.1 to 10% by weight. , preferably 0.5 to 5 wt .-%, particularly preferably 1 to 3 wt .-%, based on the composition comprises. Consequently, the composition used according to the invention contains the rheology modifier only in extremely small amounts, so that the presence of the rheology modifier in the composition does not adversely affect the cleaning action or performance of the textile fabric.

In the context of the present invention, it is particularly preferred if the rheology modifier is selected from inorganic additives, in particular phyllosilicates and silicas, and organic additives, in particular cellulose derivatives, polyureas, acrylates, metal soaps and polyurethane thickeners, and mixtures or combinations thereof. When adding only small amounts of the abovementioned additives, the rheology and viscosity of the composition used according to the invention can be adjusted in a targeted manner without adversely affecting further properties of the composition, such as, for example, the cleaning action or performance.

According to one preferred embodiment of the invention, the composition - in addition to at least one solvent and at least one rheology modifier - also at least one adhesion enhancer. In particular, the adhesion promoter enhances the adhesion of the composition used according to the invention to the fibers or threads and yarns of the textile fabric, and thus again considerably increases the application and storage properties of the textile fabric according to the invention. The adhesion enhancer also counteracts dripping and sputtering of the composition during the cleaning process of the printing press (s) and moreover substantially improves the shelf life of the fabric of the present invention since, in synergy with the rheology modifier, it decreases Prevents composition by the influence of gravity and ensures a constant wetting of the textile fabric.

If the composition used in the context of the present invention comprises an adhesion promoter, the composition has the adhesion enhancer, in particular in amounts of 0.001 to 10% by weight, in particular 0.005 to 5% by weight, preferably 0.01 to 5% by weight. , preferably 0.05 to 3 wt .-%, particularly preferably 0.1 to 2 wt .-%, based on the composition, on. Accordingly, the adhesion promoter is added to the composition in particular only in extremely small amounts and thus does not adversely affect the cleaning properties of the composition.

In particular, particularly good results are obtained in the context of the present invention, when the adhesion enhancer is selected from styrene / butadiene copolymers, butadiene / vinyl acetate copolymers, styrene / acrylate copolymers, polyacrylic acid esters, polyvinyl alcohols, methylhydroxypropylcellulose, preferably styrene / butadiene copolymers, and Mixtures and combinations of these compounds. With the adhesion enhancers mentioned above, it is possible to achieve an extremely homogeneous wetting of the textile fabric according to the invention which is uniform over a long period of time.

Furthermore, it can be provided in the context of the present invention that the composition used according to the invention contains a surfactant. The presence of surfactants in the composition used in accordance with the invention in particular facilitates removal of particulate solids, such as, for example, paper residues or dust, of printing cylinders and printing blankets, since such solids are dispersed by the surfactant and subsequently entrained with the textile fabric. In addition, the presence of a surfactant also allows the dispersion of larger paint residues, which are not immediately dissolved by the solvent, and thus their removal of printing press parts or printing press accessories. The presence of surfactant thus leads to a further improvement in wetting and to the formation of a dispersion of cleaning composition, color and paper residues, etc.

According to a preferred embodiment of the present invention, the surfactant or a combination of surfactants is selected such that the composition used according to the invention is in the form of a microemulsion. In the context of the present invention, a microemulsion is understood to mean an emulsion whose dispersed or disperse phase is finely distributed in the continuous phase in such a way that the resulting dispersion or emulsion does not emit electromagnetic radiation visible area scatters; Microemulsions are thus generally clear and transparent, in contrast to conventional emulsions, which usually have a distinct haze. The particle or domain size of the dispersed phase in microemulsions is generally less than 350 nm.

Microemulsions have the advantage in comparison to conventional emulsions that they are stable, in particular thermodynamically stable and long-term stable and do not tend to segregate the phases or to give an uneven distribution of the dispersed or disperse phase.

The formation of the composition used according to the invention as a microemulsion thus improves the storage stability of the textile fabrics according to the invention and produces a consistently good cleaning effect of the textile fabrics according to the invention which remains constant over a relatively long period of time.

When the composition used according to the invention comprises a surfactant, the composition generally comprises the surfactant in amounts of 0.01 to 10% by weight, in particular 0.05 to 7% by weight, preferably 0.1 to 5% by weight. %, preferably 0.2 to 5 wt .-%, particularly preferably 0.5 to 2 wt .-%, based on the composition, on. As can now surprisingly be found, even small amounts of surfactants can significantly improve the cleaning effect of the composition and thus of the textile fabric of the invention as a whole.

Particularly good results are obtained when the surfactant is selected from anionic and nonionic surfactants. It has proven particularly useful if the surfactant is selected from fatty alcohol ethoxylates, alkyl glycosides and Octylphenolethoxylaten.

In addition, the composition used according to the invention may contain further additives, in particular corrosion inhibitors, such as, for example, calcium sulfonates or benzotriazole derivatives. The specific selection of individual corrosion inhibitors or corrosion inhibitor mixtures depends on the stipulations or requirements and recommendations of the respective printing press manufacturer.

The acted upon textile fabrics, in particular the impregnated washing nonwovens, in cartons, z. B. of cardboard, corrugated cardboard, wood, etc., with a content of 1 to 50 pieces, preferably 10 to 15 pieces are packed. The individual roles can turn in slides z. B. of PVC, PP, aluminum, PE, etc. are wrapped. This prevents migration of the cleaning solution through capillary forces into the outer packaging.

Another object of the present invention - according to a second aspect of the present invention - is the use of a textile fabric according to the invention, as described above, for cleaning printing press parts and / or printing press accessories, in particular printing cylinders or impression cylinders and / or blankets.

With the textile fabric according to the invention printing cylinders, impression cylinders and blankets, especially ink-transferring blankets in the offset printing area, can be cleaned particularly time-consuming and cost-saving, the use of the textile fabrics of the invention not only environmentally friendly, but also from the perspective of occupational safety is safer than the use of cleaning cloths of the prior art.

For further details of this use according to the invention, reference may be made to the above statements on the textile fabric according to the invention, which apply correspondingly in relation to the use according to the invention.

• (a) mindestens ein Lösemittel,
• (b) mindestens einen Rheologiemodifizierer,
• (c) gegebenenfalls mindestens einen Adhäsionsverstärker und
• (d) gegebenenfalls mindestens ein Tensid

umfasst.Yet another object of the present invention - according to a third aspect of the present invention - is the use of a composition for cleaning printing press parts and / or printing press accessories, in particular printing cylinders and / or printing blankets, wherein the composition

• (a) at least one solvent,
• (b) at least one rheology modifier,
• (c) optionally at least one adhesion promoter and
• (d) optionally at least one surfactant

includes.

According to a preferred embodiment of the present invention, the composition is applied to a textile fabric, in particular an absorbent and / or porous fabric (in particular as described above), in particular the textile fabric applied thereto, preferably impregnated.

For further details on this use according to the invention, reference may be made to the above statements on the textile fabric according to the invention and its use according to the invention, which apply correspondingly to the composition according to the invention in this application.

• – in einem ersten Verfahrensschritt ein textiles Flächengebilde, insbesondere ein saugfähiges und/oder poröses Flächengebilde, mit einer Zusammensetzung beaufschlagt, insbesondere imprägniert, wird, wobei die Zusammensetzung mindestens ein Lösemittel, mindestens einen Rheologiemodifizierer, gegebenenfalls mindestens einen Adhäsionsverstärker und gegebenenfalls mindestens ein Tensid umfasst,
• – gegebenenfalls in einem nachfolgenden Verfahrensschritt das Flächengebilde verpackt und/oder gelagert und/oder transportiert wird und
• – in einem abschließenden Verfahrensschritt mindestens ein Druckmaschinenteil und/oder Druckmaschinenzubehör, insbesondere ein Druckzylinder und/oder ein Gegendruckzylinder und/oder Drucktuch, mit dem textilen Flächengebilde, gegebenenfalls nach vorheriger Entpackung des Flächengebildes, gereinigt, insbesondere automatisiert und/oder maschinell gereinigt, wird.

Yet another object of the present invention - according to a fourth aspect of the present invention - is a method for cleaning printing press parts and / or printing press accessories, in particular printing cylinders or impression cylinders and / or blankets, wherein

• In a first process step, a textile fabric, in particular an absorbent and / or porous fabric, is provided with a composition, in particular impregnated, wherein the composition comprises at least one solvent, at least one rheology modifier, optionally at least one adhesion promoter and optionally at least one surfactant,
• If appropriate, the fabric is packaged and / or stored and / or transported in a subsequent process step, and
• - In a final step, at least one printing machine part and / or printing press accessories, in particular a printing cylinder and / or an impression cylinder and / or blanket, with the textile fabric, optionally after prior unpacking of the fabric, cleaned, in particular automated and / or machine cleaned, is.

For further details of this aspect of the invention, reference may be made to the above remarks on the other aspects of the invention, which apply correspondingly in relation to the method according to the invention.

• (a) mindestens ein Lösemittel,
• (b) mindestens einen Rheologiemodifizierer,
• (c) gegebenenfalls mindestens einen Adhäsionsverstärker und
• (d) gegebenenfalls mindestens ein Tensid

umfasst.Finally, another object of the present invention - according to a fifth aspect of the present invention - a composition, in particular for applying a textile fabric for cleaning printing press parts and / or printing press accessories, wherein the composition

• (a) at least one solvent,
• (b) at least one rheology modifier,
• (c) optionally at least one adhesion promoter and
• (d) optionally at least one surfactant

includes.

For further details of this aspect of the invention, reference may be made to the above remarks on the other aspects of the invention, which apply correspondingly with regard to the composition according to the invention.

Further embodiments, modifications, variations of the present invention will be readily apparent to and realizable by those skilled in the art upon reading the description without departing from the scope of the present invention.

The present invention will be illustrated by the following embodiments, but without limiting the present invention thereto.

EMBODIMENTS

Cleaning Compositions According to the Invention ("Washing Solutions")

For laboratory and field tests, the wash solutions listed in Table 1 were prepared and prepared and used; the preparation takes place in each case by mixing the individual components. The examples or washing solutions A to C correspond to non-inventive examples or washing solutions, while the examples or washing solutions D to F examples of the invention or washing solutions represent. Wash A is a wax solution commonly used in the cleaning of offset printing process blankets; the washing solutions B and C are further comparative examples. Table 1: Composition of the washing solutions tested (all quantities in% by weight) Not Inventive inventively wash solution A B C D e F Fatty acid esters on coconut oil flash point 140 ° C 10 10 10 10 10 10 Fatty acid esters on coconut oil, flash point 170 ° C 30 30 30 30 29 28 Diisobutyl ester [% by weight] 40 39 39 39 38 38 Aliphatic cycloparaffinic hydrocarbon (D140) 20 20 20 20 20 20 Rheology Modifier Silicate Bentonite Tixogel VZ 1 1 1 Emulsifier / nonionic surfactant Alkyl polyethylene glycol ether 1 2 2 Adhesion enhancer styrene / butadiene copolymer 1 1

Distribution of wash solutions in a washer-cloth roll

For the following tests, washcloth rolls having a width of 533 mm and a length of 9 m of a nonwoven fabric of 45% by weight of polyester and 55% by weight of cellulose regenerate were used for the Ryobi 520 offset printing machine. The individual washing fleece rolls were each impregnated with the washing solutions A to F, the volume of washing solution applied to the washing fleece corresponding to 60% of the maximum impregnating volume.

After soaking, the washer cloth rolls were stored vertically. After 1, 3, 12 and 24 hours respectively, the change in the distribution of the washing solution in the roll was measured. The rollers were divided in the middle and weighed in each case the upper and lower parts. Table 2: Falling of the washing solution in the washing nonwovens under the influence of gravity as a function of time Distribution of the washing solution in the roll [% by weight] Start O: U ¹ 1 h O: U ¹ 3 h O: U ¹ 12 h O: U ¹ 24 h O: U ¹ Washing solution A 50:50 48:52 46:54 40:60 37:63 Washing solution B 50:50 48:52 46:54 41:59 36:64 Washing solution C 50:50 48:52 47:53 44:56 40:60 Washing solution D 50:50 48:52 47:53 45:55 42:58 Washing solution E 50:50 48:52 47:53 45:55 43:57 Washing solution F 50:50 49:51 47:53 46:54 44:56 ¹ O = upper half; U = lower half

It was found that the additives in the examples according to the invention (washing solutions D to F) were able to markedly reduce a drop in gravity or a gravimetric migration of the washing solution caused by gravity. This means that due to short-term unfavorable storage, the washing fleece has no or at most slight restrictions on the effectiveness result. This also applies in particular to a longer positioning of the rollers in the printing machine.

The washing nonwovens according to the invention (washing solutions D to F) therefore show a more uniform cleaning performance of the impregnated rolls and easier handling.

Cleaning effect of the impregnated washing fleece rolls

For the following experiments, washcloth rolls having a width of 533 mm and a length of 9 m made of a nonwoven fabric of 45% by weight of polyester and 55% by weight of cellulose regenerate were used for the Ryobi 520 offset printing machine as in the above examples. The washing fleece rolls were soaked with the washing solutions A to F, the volume of washing solution applied to the washing fleece corresponding to 60% of the maximum impregnating volume.

After impregnation, the washer cloth rolls were clamped in a Ryobi 520 offset printing machine. After each approximately 1,000 prints, the blanket was cleaned, whereby the ink coverage of the blanket was systematically varied.

The cleaning effect of the washing fleece was then inspected and analyzed and rated on a grading scale from "1" to "6". The grade "1" corresponds to a complete removal of all paint residues and particles; the grade "2" corresponds to a good cleaning of the printing blanket, with small amounts of paint residues and particles remaining on the blanket; the grade "3" corresponds to sufficient cleaning of the blanket for a variety of applications; the grade "4" corresponds to the whereabouts of a slight haze of paint residue on the blanket; the note "5" corresponds to a clearly visible veil of color residue on the blanket, and the mark "6" corresponds to an insufficient cleaning of the blanket. The results of the tests are summarized in Table 3 below. Table 3: Cleaning effect of the washing fleece as a function of the ink coverage of the printing blanket Ink coverage of the printing blanket 10% 33% 50% 100% Washing solution A 2 3 4 6 Washing solution B 1-2 2 3-4 5 Washing solution C 1-2 2-3 4 5 Washing solution D 1 1 2-3 3-4 Washing solution E 1 1 1-2 2-3 Washing solution F 1 1 1 2

The tests for the cleaning effect of the washing nonwovens and washing solutions according to the invention and the values in Table 3 show that the use of the washing solutions D to F according to the invention in comparison to the standard solution (washing solution A) and the other comparative washing solutions (washing solutions B and C) to a significantly improved cleaning effect leads. It could be determined that the additives could improve the ink receptivity and the dispersibility of the wash solution. In Examples D to F according to the invention, it was possible to substantially increase the cleaning action and at the same time to reduce the consumption of washing fleece by approximately 15%.

A dripping of the washing solution, especially at the roll ends, was no longer observed in the washing solutions D to F, whereas the washing solutions A and B showed a strong dripping and noticeable dripping was observed even in washing solution C.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 9116242 U1 [0009]
• DE 60031075 T2 [0010]
• DE 10003161 A1 [0021]
• US 5368157 A [0022]
• DE 69526427 T2 [0023]

Cited non-patent literature

• DIN EN ISO 2431 [0069]

Claims (10)

Textile fabric, in particular absorbent and / or porous fabric, preferably for cleaning printing press parts and / or printing press accessories, in particular printing cylinders and / or impression cylinders and / or blankets, wherein the fabric is applied, in particular impregnated, with a composition, wherein the composition (a) at least one solvent, (b) at least one rheology modifier, (c) optionally at least one adhesion promoter and (d) optionally at least one surfactant includes. Textile fabric according to claim 1, characterized that the textile fabric is web-shaped and / or that the textile fabric is wound into a roll, in particular onto a spindle or a cylinder, and / or in that the textile fabric is a woven fabric, a knitted fabric, a knit fabric, a scrim, a nonwoven or a textile composite, preferably a nonwoven and / or a nonwoven. Textile fabric according to claim 1 or 2, characterized the textile fabric comprises or consists of natural fibers, in particular mineral, animal and / or vegetable fibers, in particular wherein the natural fibers are selected from glass fibers, mineral wool, silk, wool, cotton and hemp fibers, preferably cotton, and / or in that the textile fabric comprises or consists of chemical fibers, in particular fibers of natural and / or synthetic polymers, in particular wherein the chemical fibers are selected from cellulose fibers, cellulose regenerated fibers, polyamide fibers, polyester fibers, polyvinyl chloride fibers, polyethylene fibers, polypropylene fibers, polyphenylene sulfide Fibers, polyacrylonitrile fibers, polyimide fibers, polytetrafluoroethylene fibers, aramid fibers and polyamideimide fibers, preferably regenerated cellulose fibers and polyester fibers. Textile fabric according to one of the preceding claims, characterized in that the textile fabric has a basis weight of 20 to 400 g / cm ² , in particular 30 to 350 g / cm ² , preferably 35 to 300 g / cm ² , preferably 40 to 250 g / cm ² , particularly preferably 45 to 225 g / cm ² , very particularly preferably 50 to 200 g / cm ² , and / or that the textile fabric with 20 to 1200 ml, in particular 25 to 1000 ml, preferably 30 to 800 ml, preferably 35 to 600 ml, more preferably 40 to 500 ml, the composition per m ^{2 of} the textile fabric applied, in particular impregnated, in particular wherein the application of the textile fabric to the composition by means of spraying or by means of impregnation. Textile fabric according to one of the preceding claims, characterized that the composition at a temperature of 25 ° C and a pressure of 1.013 bar is liquid and / or flowable, in particular liquid, and / or that the composition at a temperature of 20 ° C determined according to DIN EN ISO 2431 dynamic viscosity in the range of 1 to 2,000 mPas, in particular in the range of 2 to 1,500 mPas, preferably in the range of 5 to 1,000 mPas, preferably in the range of 7 up to 500 mPas, particularly preferably in the range from 10 to 250 mPas, very particularly preferably in the range from 15 to 150 mPas. Textile fabric according to one of the preceding claims, characterized in that the composition contains the solvent in amounts of 50 to 99 wt .-%, in particular 70 to 99 wt .-%, preferably 80 to 98 wt .-%, preferably 90 to 98 wt .-%, more preferably 50 to 99 wt .-%, based on the composition contains, and / or that the solvent is selected from polar and nonpolar solvents or mixtures thereof and / or that the solvent is selected from water, polar organic Solvents, in particular ethers, polyethers, esters or alcohols, or non-polar organic solvents, in particular aliphatic or aromatic hydrocarbons, and mixtures thereof and / or in that the solvent is selected from aliphatic hydrocarbons, monoesters, in particular fatty acid esters, glycol ethers, dioctyl adipate, diisobutylsuccinate, diisobutylglucurate, Diisobutyl adipate and water and / or that the solvent is substantially free of vo n volatile organic compounds, in particular of organic constituents having a vapor pressure of about 10,000 Pa at 20 ° C, and / or the solvent has a boiling point of at least 100 ° C, in particular at least 150 ° C, preferably at least 200 ° C, at 1.013 bar. Textile fabric according to one of the preceding claims, characterized in that the composition contains the rheology modifier in amounts of 0.01 to 20% by weight, in particular 0.05 to 15% by weight, preferably 0.1 to 10% by weight, preferably 0.5 to 5% by weight , particularly preferably 1 to 3 wt .-%, based on the composition, and / or in that the rheology modifier is selected from inorganic additives, in particular phyllosilicates and silicic acids, and organic additives, in particular cellulose derivatives, polyureas, acrylates, metal soaps and polyurethane thickeners, and mixtures thereof. Textile fabric according to one of the preceding claims, characterized the composition comprises the adhesion promoter in amounts of 0.001 to 10% by weight, in particular 0.005 to 5% by weight, preferably 0.01 to 5% by weight, preferably 0.05 to 3% by weight, particularly preferably 0 , 1 to 2 wt .-%, based on the composition, and / or in that the adhesion promoter is selected from styrene / butadiene copolymers, butadiene / vinyl acetate copolymers, styrene / acrylate copolymers, polyacrylic acid esters, polyvinyl alcohols, methylhydroxypropylcellulose, in particular styrene / butadiene copolymers. Textile fabric according to one of the preceding claims, characterized the composition contains the surfactant in amounts of from 0.01 to 10% by weight, in particular from 0.05 to 7% by weight, preferably from 0.1 to 5% by weight, preferably from 0.2 to 5% by weight , particularly preferably 0.5 to 2 wt .-%, based on the composition, and / or in that the surfactant is selected from anionic and nonionic surfactants, in particular wherein the surfactant is selected from fatty alcohol ethoxylates, alkyl glycosides and octyl phenol ethoxylates. Composition, in particular for applying to a textile fabric for cleaning printing press parts and / or printing press accessories, the composition (a) at least one solvent, (b) at least one rheology modifier, (c) optionally at least one adhesion promoter and (d) optionally at least one surfactant includes.