EP1470293A1

EP1470293A1 - Machine for the production and/or conversion of a sheet of material and methods relating to such a machine, preventing impurities or facilitating removal thereof

Info

Publication number: EP1470293A1
Application number: EP20030734712
Authority: EP
Inventors: Ingo Becker; Horst Kaipf; Manfred Ueberschär; Werner Buttschardt; Klaus Meier; Ingo Gottwald; Josef Janzer
Original assignee: Voith Paper Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2002-01-29
Filing date: 2003-01-29
Publication date: 2004-10-27
Also published as: WO2003064768A1; US20050069635A1

Abstract

The invention relates to a machine for producing or/and converting a sheet of material (2), particularly a sheet of paper or cardboard, optionally a spreading machine used for applying a fluid or a pasty application medium (M) on one or both sides of the running sheet of material (2) by means of at least one application device (1). The invention also relates to a method for treating a carrier surface of said machine (5, 6, 9, 10, 11, 12, 13). At least one area or partial area of the machine, which is or could be exposed to a medium (M), optionally an application medium, or/and is subjected to another soiling hazard during operation or/and starting or/and turning off of the machine or/and in at least one exceptional operating condition of the machine, is formed by a protective layer (A) that is applied to the carrier surface. Said protective layer (A) has anti-adhesive properties in relation to the medium (M) or soiling material or/and can be removed together with the possibly adhering medium (M) or soiling material or can constantly be renewed during operation.

Description

MACHINE FOR THE PRODUCTION AND / OR FINISHING OF A MATERIAL RAIL AND SOILS OR SOILS RELATING TO SUCH A MACHINE. PROCEDURES TO EASIER ELIMINATION

description

The invention relates to a machine for producing and / or refining a material web, in particular made of paper or cardboard, optionally a coating machine for one-sided or double-sided application of liquid or pasty application medium to the running material web with the intermediation of at least one application unit, and a method for treatment or to protect an area of such a machine. The invention further relates to a method for the maintenance and / or cleaning of such a machine.

The invention relates in particular to surfaces or partial surfaces or at least one surface, possibly a carrier surface, or partial surface of such a machine which is in operation or / and when the machine starts up and / or when the machine is shut down and / or in at least one exceptional operating state The machine used to manufacture or refine the medium, possibly the application medium, is or could be exposed and / or is subject to the risk of other contamination.

Such surfaces of the machine are, for example, those which, on the one hand, guide or are acted upon by the application medium used for coating the material web (coating color, glue, starch and the like). These support surfaces can be, for example, the wall of the nozzle lips of a free jet nozzle or also act as ink collecting trays and the like, which are attached to the coater.

On the other hand, there are also those surfaces which, when the material web is coated, are contaminated by sprayed-off paint particles together with fiber components and other particles which have been detached, and which as a rule - conventionally - adhere to these carrier surfaces.

Especially when these surfaces, especially surfaces, come into contact with the warm to hot coating color and the ambient air, the paint parts dry quickly and crust over. In the further course of the coating process of the web, these incrustations build up more and more and can form "chunks". These chunks can crumble and fall onto the freshly painted web, negatively affecting the coating result and even tearing off the running material web with considerable machine downtimes. Such chunks also get stuck on or in the application nozzles and thereby cause blockages, which likewise considerably disrupt the application result.

In order to reduce or eliminate the adherence and caking of such "soiling", the affected areas are conventionally sprayed with water, as a result of which the incrustations are softened and / or diluted. Certain areas, e.g. B. cooled the nozzle lips of a free jet nozzle, the condensate that forms contributes to the dilution and avoiding caking of the paint particles.

In this context, reference is made to the following publications:

- DE 34 04 706, in which a line border delimiter is disclosed, which with

Is provided channels through which a special cleaning liquid clumps clumps of the coating medium; DE 296 17 829, in which a vibration element is disclosed which is arranged in the space between a doctor element and the baffle bar of an application device and is intended to keep the baffle bar free of incrustations as a result of the vibration;

DE 1 98 01 140, which proposes a solution according to which the jet outlet opening of a free jet nozzle is to be kept clear by regulating the inflow of application medium or another parameter of the application medium;

DE 198 14 491, in which the possibility is disclosed that a cleaning liquid is injected directly into the metering gap leading to the jet outlet opening;

- DE 1 98 14 490, which proposes a solution according to which mechanical removal of the blockages of the outlet opening is provided;

DE 101 1 8 631, which proposes a solution according to which a cooling channel, as already described above, is incorporated into one or both nozzle lips of a free jet nozzle.

All of the solutions mentioned are quite complex and expensive. The intervals in which cleaning must take place are often very short. Usually the machine has to be switched off. Since cleaning is often very time-consuming, downtimes are often quite long and the known solutions are therefore very inefficient.

In contrast, it is an object of the invention to provide structural and / or procedural measures as to how such contaminations can be avoided or at least reduced or at least reduced in a comparatively inexpensive manner or can be removed more easily. To achieve this object, a machine for producing and / or finishing a material web, in particular made of paper or cardboard, optionally a coating machine for one-sided or bilateral application of liquid or pasty application medium to the running material web is provided according to a first solution with reference to claim 1 Mediation of at least one commissioned work, at least one surface or partial area and / or at least one area or partial area of the machine which is in operation or / and when the machine starts up and / or when the machine is shut down and / or in at least one exceptional operating state the machine used to manufacture or refine the medium, possibly the application medium, is exposed or could be exposed and / or is subject to the risk of other soiling, through a protective layer (if required, solid) applied permanently or temporarily (if necessary also referred to as a barrier layer) on a carrier surface ar) is formed or is formed with such a protective layer which has non-stick properties with respect to the medium or to polluting material and / or can be removed together with any adhering medium or polluting material.

By providing a protective layer with non-stick properties, contact between a respectively endangered surface of a respective machine part and soiling medium, in particular an application medium, can be avoided. The non-stick properties ensure that the polluting media only adhere to the protective layer to a small extent, so that no cleaning is necessary, or at least cleaning is considerably easier. As a functional layer, the protective layer can be intimately connected to the surface of the respective carrier (for example stainless steel or CFRP) and is then not renewed over the life of the component. The protective layer can to a certain extent be an integral part of the component and, due to the non-stick properties, prevents an intimate connection to deposits or soiling. The As a result, surface properties of the original carrier surface are changed profoundly, namely in such a way that impurities can no longer adhere or at most only adhere poorly.

Instead of or - preferably - in addition to the non-stick properties, the protective layer can only be applied temporarily and is then comparatively easy to remove together with any contaminating material that may be adhering to it. For this purpose, the protective layer can be connected as a functional layer to the surface of a support or the like (usually stainless steel or CFRP) and, in so far, have a separating function between polluting media on the one hand and the surface or partial surface on the other hand, but after a functional period (e.g. after a Day or a month or half a year). Insofar as impurities adhere to the protective layer (also known as a barrier layer), they can be easily removed together with the protective layer, since there is no contact with the surface or partial surface of the machine protected by the protective layer.

In this connection, the invention also provides a method for treating a carrier surface of a machine for producing and / or finishing a material web, in particular made of paper or cardboard, and optionally a coating machine for applying liquid or pasty application medium on one or both sides on the running material web with the mediation of at least one application work, with a protective layer on the carrier surface that is in operation or / and when starting the machine and / or when shutting down the machine and / or in at least one exceptional operating state of the machine of manufacture or finishing serving medium, possibly application medium, is exposed or could be and / or is subject to the risk of other contamination. It is mostly about the protective layer in this context thought that the protective layer has non-stick properties in relation to the medium or to soiled material and / or together with adhering medium or contaminating material is removable. The advantages explained above result.

Advantageous further developments of the machine according to the invention and of the method according to the invention result from subclaims 2 to 1 6 and 1 8 to 25.

The protective layer can advantageously be made of a hydrophobic, i.e. H. water-repellent coating material can be formed.

The inventors have recognized that on surfaces which are provided with such a hydrophobic - non-wetting - coating, for example in the form of a paint, the media which tend to stick (predominantly machine-derived color particles and other soiling) from the support surfaces are simple roll off so that no dirt or incrustations form for a long time. The cleaning cycles are significantly longer. This means that the machine has to be switched off less often, which reduces the disadvantageous and costly downtimes. Even with the cleaning work now to be carried out at greater intervals, this work is easier. Another advantage is that fewer web breaks (caused by falling chunks) occur.

The coating material can advantageously have dirt-repellent and / or electrostatically repellent properties. This allows the cleaning intervals to be pushed out particularly far.

The protective layer can be designed as a protective layer containing PTFE (Teflon or polytetrafluoroethylene) and / or fluorine and / or have non-stick properties based on the lotus flower effect. Advantageously, the protective layer is or is applied above all to support surfaces in machines of the type mentioned, in particular coating machines, on which the susceptibility to contamination is particularly high. The protective layer could, in particular, be located on the inside or / and outside of the support surfaces of machine components, such as the inner and outer walls of an outlet opening of an application nozzle, of guide surfaces, of paint distribution pipes, an ink tray and the like, in particular on the inside or / and outside of the support surfaces of an application unit of the machine. be upset. In general, it is proposed that at least a metallic surface be or will be implemented with the protective layer. Of course, such a protective layer can be used on application works of various types and in other areas of the machine. For example, surfaces of a film press and / or an application unit with a long exposure time of the application medium (LTDA) or / and an application unit with a short exposure time of the application medium (SDTA) or / and an application unit with a pressure free jet nozzle or / and one can be covered with the protective layer Commissioned work for curtain coating to be executed.

As already mentioned briefly, the protective layer can be applied permanently or / and can be an integral part of a machine component. The protective layer is / is firmly connected to the surface of the carrier surface of the machine, so that the protective layer does not have to be renewed during the life of the corresponding component. To a certain extent, the protective layer can be “constructed” into the component from the outset and, in this respect, can no longer be imagined as being without the component. Another interesting possibility is to provide a component, possibly a plate component, forming the protective layer on the carrier surface.

The protective layer prevents a firm connection of the deposits or dirt to the carrier surface by the Surface properties of the original carrier surface changed so that contaminants can no longer adhere to it. The protective layer can advantageously be connected to the carrier surface of the machine component by adhesive forces, for example using an adhesive.

The protective layer can be applied to the relevant carrier in the manner of a paint or varnish, in particular it can be brushed on or sprayed on. The protective layer can also be sprayed on, vapor-deposited or otherwise applied in a different state from the finished protective layer, in which case the protective layer in particular hardens on the carrier surface of the machine component or the like.

The protective layer can be applied to polished, cleaned and also to previously coated, for example metallic, surfaces. For example, it can be applied in a thickness of 40 to 200 μm. A polished protective layer can be provided. If the protective layer is applied by brush, the protective layer can be polished, for example, after a drying time of, for example, 1 to 5 hours, depending on whether hot air is used for drying, as a result of which the non-stick properties can be significantly improved.

Furthermore, the protective layer could also consist of a flexible flat, possibly elastic material, for example in the form of a film or a sheet material. This flat material could, for example, be shrunk on under the influence of temperature, the protective layer consisting of the flat material also being able to adapt easily to complicated surface geometries. The protective layer would then be held on the carrier surface by mechanical clamping forces become. Alternatively, the protective layer could also be glued to the support surface of the machine.

The protective layer could also be provided in multiple layers, at least one uppermost layer of the multilayer protective layer being temporarily applied and being removable without damaging the underlying layer. The top layer can be removed either for a subsequent renewal of the removed layer or protective layer or - preferably - for the layer or layers underneath subsequently forming the protective layer. The number of layers can be such that it is sufficient for the entire life of the component. When the last layer has been removed, a new (multi-layer) coating can be applied again.

The protective layer applied in particular temporarily, or at least the removable top layer, is preferably more elastic than the carrier surface.

For retrofitting an existing machine within the meaning of the invention, it will generally be particularly advantageous to:

Spray on or evaporate protective layer and harden on the support surface of the machine component. Another possibility is that the

Protective layer is stuck on. Furthermore, there is the one already mentioned

Possibility to shrink on the protective layer. A particularly expedient variant is that the protective layer is spread on, preferably in the manner of a lacquer, a paint or a paste. Such painting is easy to implement. The coating material, which preferably has a hydrophobic effect, can in particular advantageously be applied to polished, cleaned, and also to already painted surfaces, possibly metal surfaces. As mentioned above, this can

Coating material advantageously have dirt-repellent and / or electrostatically repellent properties in order to Delay cleaning intervals particularly far. For example, Teflon (PTFE, ie polytetrafluoroethylene) or fluorine-containing media (as a paste or as a lacquer) can be used as the coating material. The method can also be used in other areas than previously mentioned for a machine for producing or / and finishing a material web, in particular a fibrous web, where other contaminations than previously mentioned occur. The method will be particularly usable on surfaces in coating machines because the susceptibility to contamination is particularly high here. The surfaces to be treated include, for example, guide surfaces inside and outside the coater, inner and outer walls of the outlet openings of application nozzles, metering gaps, paint distribution pipes and paint pans on the coating machine.

The protective layer can be designed in such a way that it can be easily removed after a period of operation (e.g. a day or a month or half a year). It is crucial that any contamination can be easily removed together with the protective layer. The protective layer can be removed, for example, using a solvent and / or by setting a particular removal temperature. In the case of a multilayered layer structure of the protective layer, it can advantageously be provided that the uppermost layer can simply be removed.

In this context, the invention further provides, with reference to claim 26, a method for the maintenance and / or cleaning of a machine, in particular a machine according to the invention as mentioned above, for the production and / or finishing of a material web, in particular of paper or cardboard, optionally a coating machine for one-sided or double-sided application of liquid or pasty application medium to the running material web by mediation of at least one application unit, at least one surface or Partial area and / or at least one area or partial area of the machine which serves to manufacture or refine the medium during operation or / and when the machine starts up and / or when the machine is shut down and / or in at least one exceptional operating state of the machine, If applicable, application medium, is or could be exposed and / or is subject to the risk of other contamination, as a protective layer temporarily applied to a carrier surface or with such a protective layer, comprising the step of the protective layer including any adhering medium or . polluting material is removed. Advantageous further developments of the method result from subclaims 27 to 31.

With regard to the proposed maintenance / cleaning method, it is also thought that the protective layer has non-stick properties with respect to the medium or to contaminating material. The method can follow or encompass the method according to the invention for treating a carrier surface. The resulting protective layer will usually be renewed. The protective layer can be removed using a solvent and / or by setting a special release temperature. A multilayer protective layer can advantageously be provided, from which at least one uppermost layer is temporarily applied and the uppermost layer is removed, either for a subsequent renewal of the removed layer or protective layer or - preferably - for the layer or layers below it to be the protective layer form.

According to another approach, a machine for the production and / or finishing of a material web, in particular of paper or cardboard, and optionally a coating machine for one-sided or double-sided application of liquid or pasty application medium to the running material web with the intermediation of at least one is proposed according to the invention with reference to claim 32 Commissioned work, whereby at least one area or partial area and / or at least one area or partial area of the machine that is in operation or / and when starting up the machine or / and when shutting down the machine and / or in at least one exceptional operating state of the machine or Refining medium, possibly application medium, is exposed or could be and / or is subject to the risk of other contamination, at least for operation with a protective layer (also known as a barrier layer) on the basis of a protective layer supplied or applied by means of a feed or application device on the surface or partial surface or in the area or partial area forming protective medium can be provided, which can be removed if necessary and / or is continuously renewable in operation.

For example, it is contemplated to provide a barrier layer made of a material that does not become completely solid even during operation. The

The barrier layer can, for example, be sprayed on or evaporated before use and is preferably very finely distributed on the

Support surface. Soiling and possibly the application medium do not come into contact with the carrier surface. If desired, the barrier layer can be removed comparatively easily after use

Carrier surface are removed. Any soiling is removed at the same time. Another possibility is that the

Protective layer or barrier layer constantly renewed in operation, the

Renewal can advantageously include removal of contaminants.

In this context, the invention also provides a method for protecting a carrier surface and / or an area or partial area of a machine, for example a machine according to the invention as mentioned above, for the production and / or finishing of a material web, in particular made of paper or cardboard, coating machine for one-sided, if necessary or applying liquid or pasty application medium to both sides of the running material web with the intermediation of at least one application unit, a protective layer being provided or provided on or in order to protect the carrier surface or the area or partial area such that the protective layer is applied to at least one Area or partial area of the machine that is or will be exposed to the manufacturing or finishing medium, possibly application medium, during operation and / or when the machine starts up and / or when the machine shuts down and / or in at least one exceptional operating state of the machine could and / or be subject to the risk of other contamination, at least for the operation by means of a protective medium supplied or applied via a feed or application device.

Furthermore, in this context, with reference to claim 62, a method is provided for the maintenance and cleaning of a machine, for example a machine according to the invention as mentioned above, for the production and / or finishing of a material web, in particular made of paper or cardboard, optionally a coating machine for one-sided or two-sided Applying liquid or pasty application medium to the running material web with the intermediation of at least one application unit, whereby at least one surface or partial surface or / and from at least one region or partial region of the machine that is in operation or / and when the machine starts up and / or when the machine is shut down and / or in at least one exceptional operating state of the machine, the medium used for the manufacture or refinement, possibly the application medium, is or could be and / or is subject to the risk of other soiling and at least for operation with a protection layer is provided on the basis of a protective medium supplied by means of a feed device and forms the protective layer on the surface or partial surface, the protective layer is removed and / or is constantly renewed during operation. Advantageous developments of the machine according to the invention and the method according to the invention result from subclaims 33 to 50, 52 to 61 and 63 to 65.

The method for the maintenance and cleaning of a machine can follow on from an implementation of the method for protecting a carrier surface of a machine or can comprise this. In particular, if the protective layer is removed in order to protect the carrier surface again, the protective medium for forming the protective layer can be applied again to the carrier surface. The removal and reapplication of the protective layer according to the invention can be part of an automatic maintenance sequence for the associated machine, the removal of the protective layer being able to include cleaning of the component in question or the removal of the protective layer being followed by cleaning of the component concerned which is to be carried out by the renewed component Application of the protective layer precedes.

The protective layer can also consist, for example, of a liquid or highly viscous or non-rigid material.

The protective layer is preferably hydrophobic and / or has dirt-repellent and / or electrostatically repellent properties.

The protective layer can advantageously be provided on support surfaces of machine components, such as the inner and outer walls of an outlet opening of an application nozzle, of guide surfaces, of paint distribution pipes, an ink tray and the like, in particular internal and / or external support surfaces of an application unit of the machine. In particular, at least one metallic surface can be provided with the protective layer. The protective layer can, for example, on a surface of a film press and / or an application unit with a long exposure time of the application medium (LTDA) or / and an application unit with a short exposure time of the application medium (SDTA) or / and an application unit with a pressure free jet nozzle and / or an application unit be provided for curtain coating.

The protective layer can be sprayed or vapor-deposited, for example, by means of the feed or application device before use, preferably in such a way that it is distributed very finely on the carrier surface. Soiling and the application medium do not come into contact with the carrier surface. For example, the protective layer can be applied by spray or spray nozzles attached to the machine. Alternatively, the protective layer can also be applied to the relevant carrier surface of the machine by means of a suitable coating device. For example, a protective layer based on oil, fat, wax, paraffin or the like can be provided. In principle, simple oiling or greasing of the surface in question can be considered.

The protective layer is preferably not detached or dissolved by the application medium, although smaller amounts of the protective layer which could detach during operation do not necessarily adversely affect the application medium and the application process. The protective layer medium can advantageously be biodegradable with regard to the environment and the disposal costs.

If the protective layer is to be removed, this can advantageously be achieved, for example, by setting a temperature which does not occur in normal operation, the temperature preferably being greater than 60 ° or less than 20 °. In addition or alternatively, the protective layer can also be detached by an assigned solvent that does not occur in the application medium.

The protective layer could also be designed as a protective layer that constantly renews itself during operation. For this purpose, a flowing barrier can advantageously be generated or can be generated, which keeps the contaminants away from the surface of the machine component and preferably transports them away from the surface. This liquid layer preferably consists of water. At least a solvent should be provided by means of which the application medium can be dissolved. In addition to the protective layer, the protective layer also has a cleaning function. If water is used as a protective layer, this has the advantage that existing recycling cycles can be used.

For example, the protective layer can be designed as a flat water curtain that flows over the surface of the machine component to be protected. The water curtain can be generated, for example, by a spray tube or a slot nozzle. This flat water curtain is preferably used on the surfaces of components below or behind the application unit, for example on the free-jet nozzle, paint trough, channels, etc.

The protective layer does not necessarily have to be used over the entire surface, it could be sufficient for the protective layer to be formed on a partial surface of a machine surface. The use of a flowing barrier or flat protective layer medium curtain, possibly a water curtain, is particularly suitable where places are exposed to heavy soiling. The protective layer medium flow, possibly water flow, also protects in particular against soiling that does not come from the outside, but is already in this area (e.g. impurities on the roller shell) or come from inside (escaping media, such as coating color). A particular advantage of this Flow is that it removes the impurities and thereby prevents a typical accumulation or build-up of material.

A partial use of the protective or barrier layer is particularly suitable for areas of the machine assigned to the lateral edge of the material web. For example, format slides and edge boundaries can often not be completely sealed. Tiny quantities of application medium can then escape here. These small amounts dry particularly quickly, which leads to the rapid build-up of harmful deposits. These small quantities can be removed by a protective or barrier layer made of flowing barrier medium, such as water. This reliably prevents build-up of coating color or general coating medium on the adjacent surfaces. A particularly effective protective or barrier layer can also be generated locally or partially at other particularly vulnerable points by a separate flow, for example a water flow. The protective layer can also be produced or produced without difficulty at locations that are not accessible from the outside, for example within a closed work space.

According to the invention, the method of claim 66 is also specifically provided. Advantageous further developments of this method result from subclaims 67 and 73, respectively.

The solutions according to the invention substantially help to avoid downtimes and thus production losses as a result of web breaks. As already mentioned, conventional web breaks could occur as a result of machine soiling, particularly in the edge areas (driver's side and drive side), as a result of dirt from the base paper, as a result of deposits of the application medium on the machine parts (e.g. on the airbars of the air dryer) ) and occur as a result of scrap paper scraps. Soiling could also lead to different types Malfunctions and thus lead to a machine stop. Such web breaks and machine stops can lead to long downtimes and high downtime costs in the case of heavy and / or stubborn soiling and as a result of long set-up times in connection with cleaning. As a result of inadequately cleaned components, other delays, in particular delays in starting and starting, can also be expected.

In contrast, the invention enables a significant improvement in runtime efficiency or performance, among other things by avoiding unintentional web breaks as a result of soiling, by avoiding other machine stops or at least by reducing their number, by reducing the downtime when stopping and by accelerating the performance. and restart time. These advantages are achieved by effectively combating dirt in the various ways according to the invention. According to one approach, the build-up of contamination is prevented or reduced, which considerably extends the runtime before the next shutdown and thus increases the runtime efficiency. Among other things, cleaning during operation is proposed. On the other hand, the downtime is significantly reduced according to another approach, which also increases the runtime efficiency significantly. Furthermore, cleaning with or on the basis of a protective layer or barrier layer according to the invention is significantly more thorough than conventional cleaning, as a result of which the security against malfunctions is further increased.

The invention in its various aspects and manifestations according to the appended claims 1, 1 7, 26, 32, 51, 62 and 66 and the dependent claims 2-1 6, 1 8-25, 27-31, 33-50, 52 - 61, 63-65 and 67-73 basically concerns any surfaces, partial surfaces, areas and partial areas, elements and partial elements of a machine of the the type mentioned, in particular also the headbox of a machine for producing a material web, in particular also the surfaces and elements in contact with the flow from the material suspension (from which the material web is formed) and in particular also the nozzle outlet area and in particular also drainage elements which are effective in forming the material web, so that formation disturbances during longer machine operation are avoided.

It is pointed out that if the term surface or partial surface is used here, this does not necessarily mean that there is a planar or flat "surface". Each at least partially exposed body, each at least partially exposed element and each at least partially exposed portion of a machine as mentioned has at least one surface or a partial surface (possibly inner surface or outer surface, possibly inner peripheral surface or outer peripheral surface) for which it may be. could be considered to provide protection according to the invention. The machine areas, machine sub-areas, machine areas, machine sub-areas, machine sections or machine sub-sections specifically mentioned above and below have purely exemplary, non-restrictive character, but in any case also give a specific preferred application for the inventive proposals.

Within the scope of the invention, petroleum can also advantageously be used as the liquid barrier layer medium.

The invention is explained in more detail below on the basis of exemplary embodiments shown in the figures.

Fig. 1 shows a schematic representation

Embodiment of a machine according to the invention, and also serves to explain a preferred application of a possibility of the method according to the invention.

FIG. 2 shows a schematic illustration of a partial figure 2a

Embodiment variant of the example in FIG. 1. Part 2b shows the layer structure of an embodiment of a protective layer A according to the invention, corresponding to section line B-B in part 2a.

3, 4 show in a schematic representation further embodiment variants of the example of FIG. 1.

1, a so-called free-jet nozzle applicator 1 is shown. With this application unit, a running paper web 2, which is guided around a support roller 3, is coated with an application medium M, for example a pigmented coating color. The direction of travel of the roller and the web is indicated by the arrow L.

The application unit 1 comprises a support beam 4 which carries the individual elements of the application nozzle 5. The supporting beam 4 in turn comprises a distribution pipe, via which the liquid or pasty application medium M is fed to the nozzle 5.

The supporting beam 4 has on its upper side a rear wall 7 running approximately radially to the roller 3 and a parallel front wall 8 running to the rear wall, each of which merges into nozzle lips 9 and 10, or is placed on the nozzle lips. Between the front wall 8 with nozzle lip 1 0 and the rear wall 7 with nozzle lip 9 there is a supply gap 11 starting from the distribution tube, which then forms the outlet or application nozzle 5 in the region of the nozzle lips, from which the medium M is delivered to the running paper web 2 becomes. In the wall 8 is on hers Outside an overflow surface 1 2 formed, which opens into an excess gutter 1 3. The excess medium can be removed from this collecting trough and, if necessary, can be fed back to the application unit after appropriate cleaning and venting.

So that the approx. 60 ° warm application medium does not (or not for a long time) adhere to the metal application parts and can build up there in connection with the ambient air, in the present example the application nozzle 5, the supply gap 11, the distribution pipe 6, provide the outer surface of the nozzle lips 9 and 10, the overflow surface 12 and also the collecting channel 13 with a protective layer which has non-stick properties with respect to the application medium. In the previous example, the components or surfaces mentioned are provided with a hydrophobic coating. This protective layer or this paint is shown with a heavily drawn, dashed line A.

The coating material forming the protective layer A can advantageously be applied, for example, in a thickness of 40 to 200 μm and polished after a drying time of 1 to 5 hours, depending on whether hot air is used for drying or not, which improves the beading properties.

The hydrophobic coating material A, which can be commercially available Teflon or a fluorine-containing emulsion paint, can also contain dirt repellants and / or electrostatic repellants. This extends the time needed to clean the exposed surfaces.

Because of the coating according to the invention, the cooling channels known from the prior art, for example incorporated into the nozzle lips 9 and 10, for the passage of a cooling liquid, and the associated outlay for the cooling circuit, are no longer necessary. A coating similar to the exemplary embodiment can also be advantageously used on other application units or other areas of a coating machine, generally a machine for producing and / or finishing a material web, in particular a fiber material web (in particular made of paper or cardboard). For example, surfaces of a film press, an application unit with a long exposure time of the application medium (LDTA), an application unit with a short exposure time of the application medium (SDTA) or an application unit for coating the curtain can be provided with a coating according to the invention, for example in accordance with the exemplary embodiment with a coating according to the invention be transferred.

It can be provided that the protective layer or the paint A can be removed again, for example, by using a suitable solvent, for example in order to also remove any dirt residues adhering to the protective layer. Here, in particular, surfaces accessible from the outside, such as the overflow surface 1 2 and the collecting channel 1 3, are thought of.

However, the protective layer can also be applied permanently, if necessary in the applied state, depending on the design, to be regarded as an integral part of the component in question. A permanent coating is particularly useful for surfaces that are not accessible from the outside, such as the inner surfaces of the wall components 7 and 8 that delimit the feed gap 11.

In principle, there are many possibilities as to which properties the protective layer could advantageously have or how the protective layer could be applied or applied.

The protective layer A can have, for example, generally dirt-repellent and / or electrostatic repellent properties. The Protective layer A can have, for example, non-stick properties based on the lotus flower effect.

The protective layer A could also have been sprayed on, for example. But it is also conceivable that a flexible flat material, eg. B. a film, is glued to the support surface or has been shrunk. Alternatively, the protective layer A could also be designed, for example, as a plate component.

FIG. 2 shows a variant of the arrangement according to FIG. 1 in the partial figures 2a and 2b. Here and in the explanation of further exemplary embodiments, only the differences from the exemplary embodiments already discussed will be explained. The same reference numerals are used for identical or analog parts.

A particularly expedient way of applying a protective layer according to the invention is to glue the protective layer onto a surface to be protected, wherein preferably a detachment of the protective layer is easily possible in order to be able to detach dirt adhering to it with the protective layer. In this respect, the protective layer is only applied temporarily.

The protective layer A can, for example, as shown in FIG. 2b, be constructed in multiple layers (A1, A2, A3, A4), the uppermost layer (here A1) being removed without damaging the layers underneath (here A2, A3, A4) so that the underlying layer (here A2) is exposed and forms the surface of the protective layer. Once the last layer has been removed, a new multi-layer protective layer can be applied, for example glued, to the relevant machine surface. Instead of gluing by means of a separate adhesive, the protective layer or protective layer layers can also be self-adhering, and in this respect the renewal of the protective layer can be strong simplify. Suitable adhesives or adhesives which allow a protective layer or protective layer layer to be detachably applied are available to the person skilled in the art.

3 shows a further embodiment of the machine according to the invention. A spray nozzle arrangement 14 attached to the machine ensures that a fine film, for example oil film, on the carrier surfaces of the machine component, here on the overflow surface 12 and on the surface of the channel 13. is applied as protective layer A. 1 8 denotes an associated storage container for the protective layer medium. A respective spray nozzle of the spray nozzle arrangement can be arranged to be pivotable or / and displaceable or otherwise adjustable in order to be able to provide a protective layer A with the largest possible area of the machine which can come into contact with the application medium. The applied protective film can also be removed again via the spray nozzle arrangement 14, together with any dirt that may have adhered to it. Another, not shown, reservoir for the solvent can optionally be connected to the spray nozzle arrangement via a switching valve arrangement.

It is conceivable, for example, to provide the nozzle lips 10 with a heating element 16 in order to bring about or to support the removal of the protective layer A by an increase in temperature. If detachment by means of a solvent is provided, it may be expedient to heat the solvent, for example a heatable storage container.

4 shows a further embodiment of the machine according to the invention. In Fig. 4, a spray pipe 22 is attached to the machine in close proximity to the outlet or application nozzle 5, by means of which a flowing barrier A can be generated. The flowing barrier, for example water, flows over an adjoining nozzle 5 Edge area as well as over the overflow area 12 and thus takes coating medium splashes and other polluting substances with it into the excess collecting channel 13. A contamination of the named areas during operation is thus prevented from the outset. If deposits or dirt have formed on the surfaces, they are detached by the water and transported to the excess collecting channel 13. The advantage of this embodiment is thus that contamination of the surfaces mentioned is avoided from the outset or that cleaning takes place during operation. The runtime until the next machine standstill is therefore significantly extended.

Claims

Expectations

1 . Machine for the production and / or finishing of a material web (2), in particular made of paper or cardboard, optionally a coating machine for one-sided or double-sided application of liquid or pasty application medium (M) to the running material web (2) by means of at least one application unit (1) , wherein at least one area or partial area and / or at least one area or partial area of the machine that is in operation or / and when starting up the machine and / or when shutting down the machine and / or in at least one exceptional operating state of the machine of manufacture or finishing medium (M), possibly application medium, is exposed or could be and / or is subject to the risk of other contamination, is formed by a protective layer (A) applied permanently or temporarily to a carrier surface or is formed with such a protective layer , which has non-stick properties with regard to the medium or polluting material t or / and together with any adhering medium (M) or soiling material can be removed.

2. Machine according to claim 1, characterized in that the protective layer (A) is hydrophobic.

3. Machine according to claim 1 or 2, characterized in that the protective layer (A) has dirt-repellent and / or electrostatically repellent properties.

4. Machine according to one of claims 1 to 3, characterized in that the protective layer (A) is designed as a PTFE (Teflon) and / or fluorine-containing protective layer (A) or / and has non-stick properties based on the lotus flower effect.

5. Machine according to one of claims 1 to 4, characterized in that internal or / and external

Carrier surfaces of machine components, such as the inner and outer walls of an outlet opening of an application nozzle (5), guide surfaces (12), paint distribution pipes (6), an ink tray and the like, in particular internal and / or external carrier surfaces of an application unit of the machine with which

Protective layer are executed.

6. Machine according to one of claims 1 to 5, characterized in that at least metallic surface with the protective layer (A) is executed.

7. Machine according to one of claims 1 to 6, characterized in that at least one surface of a film press and / or an application unit with a long exposure time of the application medium (LTDA) and / or an application unit with a short

The exposure time of the application medium (SDTA) and / or an application unit with a pressure free jet nozzle and / or an application unit for curtain coating with the protective layer (A) is carried out.

8. Machine according to one of claims 1 to 7, characterized in that the protective layer (A) is applied permanently and / and is an integral part of a machine component (5, 6, 9, 10, 11, 12, 13).

9. Machine according to one of claims 1 to 8, characterized in that the protective layer (A) in the manner of a color or a paint is applied, in particular 'brushed on or sprayed on.

10. Machine according to one of claims 1 to 8, characterized in that the protective layer (A) is sprayed, evaporated or otherwise applied in a different state than the finished protective layer (A).

1 1. Machine according to one of claims 1 to 10, characterized in that the protective layer (A) in a thickness of 40 to

200 μm is applied.

1 2. Machine according to one of claims 1 to 8, characterized in that a component forming the protective layer (A), possibly plate component, is provided on the support surface.

1 3. Machine according to one of claims 1 to 8, characterized in that the protective layer (A) consists of flexible flat, possibly elastic material, such as in the manner of a film or a sheet material.

1 4. Machine according to one of claims 1 to 1 3, characterized in that the protective layer (A) is held on the carrier surface by adhesive forces, possibly glued, or is held on the carrier surface by mechanical clamping forces.

1 5. Machine according to one of claims 1 to 14, characterized in that a multi-layer protective layer (A1, A2, A3, A4) is provided, of the at least one top layer (A1) temporarily applied and without damaging the underlying layer

Layer (A2) is removable, either for a subsequent renewal of the removed layer (A1) or protective layer or - preferably - for the layer (A2) or layers (A2, A3, A4) below to form the protective layer (A).

6. Machine according to one of claims 1 to 1 5, characterized in that the preferably temporarily applied

Protective layer (A) or at least the removable top layer (A1) is more elastic than the support surface.

7. A method for treating a support surface of a machine, for example according to one of claims 1 -1 6, for the manufacture and / or refinement of a material web (2), in particular made of paper or cardboard, optionally coating machine for one-sided or double-sided application of liquid or pasty Application medium (M) on the running material web (2) with the intermediation of at least one application unit (1), with a protective layer (A) on the carrier surface which is in operation or / and when the machine starts up and / or when the machine is shut down or / and in at least one exceptional operating state of the machine, the medium (M), possibly the application medium, which is used for manufacture or refinement is or could be exposed and / or is subject to the risk of other contamination.

8. The method according to claim 1 7, characterized in that the protective layer with respect to the medium (M) or on polluting material has non-stick properties and / and together with any adhering medium or polluting material is removable.

9. The method according to claim 1 7 or 1 8, characterized in that the protective layer (A) is sprayed or evaporated and on the Carrier surface of the machine component (5, 6, 9, 1 0, 1 1, 1 2, 1 3) hardens.

20. The method according to claim 1 7 or 1 8, characterized in that the protective layer (A) is glued on.

21. A method according to claim 1 7 or 1 8, characterized in that the protective layer (A) is shrunk on.

22. The method according to claim 1 7 or 18, characterized in that the protective layer (A) is spread, preferably in the manner of a lacquer, a paint or a paste.

23. The method according to claim 22, characterized in that the protective layer (A) is applied with a thickness of 40-200 ym.

24. The method according to claim 22 or 23, characterized in that the protective layer (A) is polished after a drying time of 1 -5 hours.

25. The method according to any one of claims 17 to 24, characterized in that a multilayer protective layer (A1, A2, A3, A4) is applied, of which at least one top layer (A1) is temporarily applied and without damaging the layer underneath (A2 , A3, A4) is removable, either for a subsequent one

Renewal of the removed layer (A1) or protective layer or - preferably - for the subsequent layer (A2) or layers (A2, A3, A4) to form the protective layer (A).

26. A method for the maintenance and / or cleaning of a machine, for example according to one of claims 1 -1 6, for the production or / and finishing of a material web (2), in particular made of paper or cardboard, optionally coating machine for one-sided or double-sided application of liquid or pasty application medium (M) to the running material web (2) with the mediation of at least one application work (1), with at least one area or partial area and / or at least one area or partial area the machine (5, 6, 9, 10, 1 1, 1 2, 1 3), which / in the operation or / and when starting the machine and / or when shutting down the machine and / or in at least one exceptional operating state of the Machine (M), or application medium, which is used for the manufacture or refinement, is or could be exposed and / or is subject to the risk of other soiling, as a protective layer (A) temporarily applied to a carrier surface or with such a protective layer is the step that the protective layer (A) together with any adhering medium (M) or contaminating material is removed.

27. The method according to claim 26, characterized in that the protective layer (A) has non-stick properties in relation to the medium (M) or to polluting material.

28. The method according to claim 26 or 27, comprising a preceding implementation and / or a subsequent implementation of the method according to any one of claims 1 6 to 23.

29. The method according to any one of claims 26 to 28, characterized in that the protective layer (A) is renewed.

30. The method according to any one of claims 26 to 29, characterized in that the protective layer (A) using a Solvent and / or is set with a special stripping temperature.

31 Method according to one of claims 24 to 30, characterized in that a multilayer protective layer (AT, A2, A3,

A4) is provided, of which at least one uppermost layer (A1) is temporarily applied and the uppermost layer (A1) is removed, either for a subsequent renewal of the removed layer (A1) or protective layer or - preferably - for the fact that 10 subsequently the underlying layer (A2) or layers (A2, A3,

A4) form the protective layer (A).

32. Machine for the production and / or refinement of a material web (2), in particular made of paper or cardboard, possibly a coating machine for

15. one-sided or double-sided application of liquid or pasty

Application medium (M) on the running material web (2) with the intermediation of at least one application unit (1), at least one surface or partial area and / or at least one area or partial area of the machine that is in operation

20 or / and when the machine starts up and / or when the machine shuts down and / or in at least one exceptional operating state of the machine, the medium (M), possibly application medium, is or could be exposed to the manufacture or refinement or / and Danger of other pollution

25 is subject to, at least for operation with a protective layer (A)

Basis of a protective medium supplied or applied by means of a feed or application device, the protective layer (A) forming on the surface or partial surface or in the area or partial area, which can be removed if necessary and / or

30 is constantly renewable in operation.

33. Machine according to claim 32, characterized in that the protective layer (A) is liquid or highly viscous or non-rigid.

34. Machine according to claim 32 or 33, characterized in that the protective layer (A) is hydrophobic.

35. Machine according to one of claims 32 to 34, characterized in that the protective layer (A) has dirt-repellent and / or electrostatically repellent properties.

36. Machine according to one of claims 32 to 35, characterized in that internal or / and external support surfaces of machine components, such as the inner and outer walls of an outlet opening of an application nozzle (5), of guide surfaces (1 2), of paint distribution pipes (6), a paint tray and the like, in particular internal or / and external support surfaces of an application unit of the machine, with which the protective layer (A) can be provided.

37. Machine according to one of claims 32 to 36, characterized in that at least one metallic surface with the protective layer (A) can be provided.

38. Machine according to one of claims 32 to 37, characterized in that at least one surface of a film press and / or an application unit with a long exposure time of the application medium (LTDA) and / or an application unit with a short exposure time of the application medium (SDTA) and / or one Application unit with a pressure free jet nozzle and / or an application unit for curtain coating with the protective layer (A) can be provided.

39. Machine according to one of claims 32 to 38, characterized in that the protective layer (A) is sprayed on or vapor-deposited, preferably finely distributed on the surface of the machine.

40. Machine according to one of claims 32 to 39, characterized in that spray nozzles (14) are attached to or in the machine, which are suitable for applying the protective layer (A).

41. Machine according to one of claims 32 to 40, characterized in that the protective layer (A) is or is coated.

42. Machine according to one of claims 32 to 41, characterized in that a protective layer (A) on oil-based, fat-based, wax-based, paraffin-based or the like is provided.

43. Machine according to one of claims 32 to 42, characterized in that the protective layer (A) cannot be removed or at most only to a small extent by the application medium (M).

44. Machine according to one of claims 32 to 43, characterized in that the protective layer (A) can be removed by means of an associated solvent, in particular not occurring in the application medium, wherein preferably a device is provided for applying the solvent to the protective layer.

45. Machine according to one of claims 32 to 44, characterized in that the protective layer (A) can be removed as a result of a setting of an exceptional temperature.

46. Machine according to one of claims 32 to 38, characterized in that a flowing barrier can be produced as a protective layer (A) which removes the dirt from the surface of the machine component (5, 6, 9, 10, 1 1, 1 2, 1 3) keeps away and transported away from the surface.

47. Machine according to claim 46, characterized in that the barrier can be produced from a solvent by means of which the application medium (A) can be released.

48. Machine according to claim 46 or 47, characterized in that a liquid layer or a flat liquid curtain, preferably from water, can be produced as a barrier, preferably by means of a spray tube, a slot nozzle or the like.

49. Machine according to one of claims 46 to 48, characterized in that the protective layer (A) produced covers only a partial area of a machine area.

50. Machine according to one of claims 46 to 49, characterized in that the protective layer (A) can be produced in a work space which is closed off from the outside.

51. Method for protecting a carrier surface and / or an area or partial area of a machine, for example according to one of claims 32 to 50, for producing or / and finishing a material web (2), in particular made of paper or cardboard, optionally a coating machine for one-sided or two-sided application from liquid or pasty application medium (M) to the current

Material web (2) mediated by at least one commissioned work (1), wherein a protective layer (A) is attached or provided to protect the carrier surface or the area or partial area on it or in such a way that the protective layer (A) on at least one surface or partial area of the machine that is in operation or / and when starting the machine and / or when

Shutting down the machine and / or in at least one exceptional operating state of the machine is or could be the medium (M), possibly the application medium, which is used for the manufacture or finishing, or / and is subject to the risk of other soiling, at least for the operation by means of a is formed via a feed or application device supplied or applied protective medium.

52. The method according to claim 51, characterized in that the protective layer (A) is sprayed on or vapor-deposited, preferably in such a way that it is finely distributed on the surface of the machine.

53. The method according to claim 51 or 52, characterized in that the protective layer (A) is applied by means of spray nozzles (14) attached to or in the machine.

54. The method according to any one of claims 51 to 53, characterized in that the protective layer (A) is spread.

55. The method according to any one of claims 51 to 54, characterized in that a protective layer (A) is used which cannot be detached from the application medium (M).

56. The method according to claim 51, characterized in that the protective layer (A) is constantly renewed in operation.

57. The method according to claim 56, characterized in that a flowing barrier is generated as a protective layer (A), which keeps the dirt away from the surface of the machine component (5, 6, 9, 10, 1 1, 12, 13) and from the Removed surface.

58. The method according to claim 56 or 57, characterized in that the protective layer (A) is formed from a solvent by means of which the application medium (M) can be dissolved.

59. The method according to any one of claims 56 to 58, characterized in that a liquid, preferably water, is supplied to form the protective layer (A).

60. The method according to any one of claims 56 to 59, characterized in that the protective layer (A) using a

Spray tube or a slot nozzle (22) is generated.

61. Method according to one of claims 56 to 59, characterized in that the protective layer (A) is formed on a partial surface of a machine surface.

62. Method for the maintenance and cleaning of a machine, for example according to one of claims 32 to 50, for the production and / or finishing of a material web (2), in particular made of paper or cardboard, optionally a coating machine for one-sided or two-sided

Applying liquid or pasty application medium (M) to the running material web (2) with the intermediation of at least one application unit (1), whereby at least one surface or partial surface and / or from at least one region or partial region of the machine, which in the

Operation or / and when starting the machine and / or when shutting down the machine and / or in at least one Exceptional operating state of the machine of the manufacturing or finishing medium (M), possibly application medium, is or could be exposed and / or is subject to the risk of other contamination and at least for operation with a: protective layer (A) based on an agent one

Supply device supplied, the protective layer (A) on the surface or partial surface forming protective medium is provided, the protective layer (A) is removed and / or is constantly renewed during operation.

63. The method according to claim 62, characterized in that the protective layer (A) is dissolved by an associated solvent, which does not occur in particular in the application medium (M).

64. The method according to claim 62 or 63, characterized in that the protective layer (A) is removed by setting an exceptional temperature which does not occur in normal operation, the temperature preferably being greater than 60 ° or less than 20 °.

65. Method according to one of claims 62 to 64, comprising a preceding execution and / or a subsequent execution of the method according to one of claims 51 to 61.

66. Process for treating surfaces of a machine (5, 6, 9, 10, 1 1, 1 2, 13) for the manufacture and / or refinement of a

Fibrous web (2), in particular made of paper or cardboard, these surfaces coming into contact with liquid or pasty application medium (M) when the fibrous web (2) is brushed, characterized in that that these machine surfaces (5, 6, 9, 10, 1 1, 1 2, 1 3) with a hydrophobic, i.e. H . water-repellent coating material.

67. The method according to claim 66, characterized in that the coating material (A) additionally has dirt-repellent and / or electrostatically repellent properties.

68. The method according to claim 66 or 67, characterized in that Teflon (PTFE) or fluorine-containing paints are used as coating material (A).

69. The method according to any one of claims 66 to 68, characterized in that such surfaces as the inner and outer walls of an outlet opening of an application nozzle (5),

Guide surfaces (1 2), paint distribution pipes (6), paint pans and the like of an application unit of the machine, in particular a coating machine, are treated with the coating material.

70. The method according to any one of claims 66 to 69, characterized in that metallic surfaces are treated with the coating material (A).

71. Method according to one of claims 66 to 70, characterized in that the coating material (A) is applied in a thickness of 40-200 // m.

72. The method according to any one of claims 66 to 71, characterized in that the coating material (A) is polished after a drying time of 1 -5 hours. Method according to one of claims 66 to 72, characterized in that with the coating material (A) surfaces of the machine, in particular coating machine, such as film press, application work with a long exposure time of the application medium (LDTA), application work with a short exposure time of the application medium (SDTA), application work can be treated with a pressure free jet nozzle, application unit for curtain coating.