Process and device for applying a liquid or pasty application medium on a traveling material web

Abstract

Process and apparatus for applying a liquid or pasty application medium on a traveling material web. The process comprises forming a material web in a wet end of a web production machine, and applying, via at least one application device in the wet end, at least one application medium on at least one side of the material web. The at least one application medium includes at least one organic material. The apparatus includes at least one application device located in a wet end of the web production machine, which is structured and arranged on at least one side of the material web, and at least one feeding pipe coupled to the at least one application device, which is structured and arranged for introducing at least one application medium includes at least one organic material.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present application claims priority under 35 U.S.C. § 119 of German Patent Application No. 100 46 171.9, filed Sep. 19, 2000, the disclosure of which is expressly incorporated by reference herein in its entirety.

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to a process for applying a liquid or pasty application medium on a traveling material web, e.g., a paper or material web, in which a material web is formed in a wet end of a paper or cardboard machine, and a liquid or pasty application medium is applied on the material web at least on one side by an application device in the wet end. Further the present invention relates to a device for applying a liquid or pasty application medium on a traveling material web, e.g., a paper or material web,

[0004] 2. Discussion of Background Information

[0005] The German publication DE 198 23 724 A1 is known from the prior art. In the published process for applying a liquid or pasty application medium on a traveling material web, a paper web is formed in the double wire zone of a wet end of a paper machine on which a liquid or pasty application medium, e.g., a coating paint, is applied on at least one side by an application device. Furthermore, subsequent to the initial press element of a press section, another liquid or pasty application medium, e.g., a fibrous stock suspension, is applied on the material web by at least one application device.

[0006] The paper machine for performing the published process has at least one application device each facing the material web, both in the double wire zone of the wet end of the application device and in the press section.

[0007] In this published process, it is disadvantageous that the addition of coating paint occurring solely in the wet end carries the risk that the coating paint, due to the size of its pigment particles, will be absorbed into the material web during the dewatering process, i.e., migrate into the layers and/or regions of the material web located on the inside. As a result, the published process will be only partially effective in improving the surface and, therefore, the surface quality and the printability of the material web is improved only insignificantly, if at all.

SUMMARY OF THE INVENTION

[0008] The present invention provides a process and a device of the type mentioned at the outset such that both the surface quality and the printability of the material web is improved with regard to conventional solutions with the lowest possible technical expense. Additionally, the migration of this coating paint into layers and/or regions located inside of the material web during application of at least one coating paint is to be reduced, preferably prevented completely, and an improved retention thereof is to be achieved during the dewatering process.

[0009] This process according to the invention includes using an organic material, e.g., pulp from wood grinding machines, for the application medium, which improves both the surface quality and the printability of the material web.

[0010] This organic material “arms” the material web being formed by a resistant layer and, thus, substantially aids in the prevention of the migration of at least one material, preferably added to the surface, into the layers and/or regions positioned inside thereof. Additionally, the at least one material added, preferably on the surface, is better retained during the dewatering of the material web being formed by the organic material and the material web being formed develops a smoother surface.

[0011] In an initial embodiment of the invention, it is suggested that a suspension of cellulose fibers and/or paper fibers each having a high refining degree be used as the organic material. Furthermore, in another embodiment according to the invention, the cellulose fibers and/or the paper fibers are provided with a refining degree of≧about 50° SR (Schopper-Riegler-value (refining value) according to form V/7/61, Revision of 107, Society of Pulp and Paper Chemists and Engineers [Verein der Zellstoff- und Papier/Chemiker und -Ingenieure], Edition of Jul. 1, 1961), preferably of≧about 70° SR, in particular preferably of≧about 85° SR.

[0012] The organic material present in this form provides advantages with respect to maintaining cleanliness and the reliability of the paper or cardboard machine due to the lack of conglutination of the at least one wire, the lack of impurities in the back water, an improved dewatering, and/or no essential worsening of the dewatering characteristics.

[0013] The application medium is applied according to the invention in the former or press section because the dry content and the stiffness of the material web have not achieved values that reduce and/or prevent the penetration of the application medium into the material web.

[0014] In the context of this specification, the term “wet end” is to be understood as the headbox, the former, and the press section of a paper or cardboard machine.

[0015] It is further suggested according to the invention for the at least one material added to be a coating paint, e.g., additives such as starch, binder, pigment color, size, and for the coating paint to be added to the application medium prior to applying it on the material web or for the coating paint to be applied on the material web by a secondary application device arranged downstream of the primary application device subsequent to the application of the application medium.

[0016] The time difference between the application of the organic application medium and the coating paint preferably has a value in the range of about 1 ms to about 100 ms, preferably about 20 ms to about 50 ms, since this time difference is sufficient for achieving a good degree of effectiveness, in particular degree of effectiveness of the application under technical aspects, and additionally, considering the speed of the paper or cardboard machine, constructive advantages are achieved with respect to the arrangement of the application devices and the like.

[0017] In a common embodiment, the coating paint contains components of off-set or gravure ink because these two types of ink belong to the proven prior art, are produced in large amounts, and can thus be used under economically attractive conditions. Furthermore, those two types of ink are excellently suitable for the purposes of the invention due to their chemical characteristics, among other things.

[0018] Furthermore, depending on the later use of the material web, the at least one application medium according to the invention is applied either on only one side of the material web or on both sides of the material web.

[0019] Furthermore, the at least one application medium is applied directly and/or indirectly on the material web. Both types of application have their own advantages with respect to level of effectiveness, use, expense, and the like. The type of application is finally decided depending on the type of use. Direct application can occur, e.g., by spray jets, direct applicators, or press rolls, and indirect application, in contrast, can occur by application rolls or the like. Furthermore, an application by means of a direct or indirect application device and a web, in particular a wire or felt, positioned therebetween is possible as well.

[0020] In order to allow the at least one application medium to be used as sparingly as possible, it is further suggested that it be applied on the material web in a dosed fashion.

[0021] Preferably, the at least one application medium is applied over the entire width of the web in a sectioned manner because the advantage arises of allowing a targeted influence on the lateral profile of the application medium. Additionally, the sectioned application can also result in financial advantages.

[0022] The invention includes a main application device in a wet end of a paper or cardboard machine located at least on one side of the material web having at least one feeding pipe for introducing an application medium including at least one organic medium to improve the surface quality as well as the printability of the material web.

[0023] Preferably, the application device and/or the feeding pipe have at least one additional feeding pipe for introducing at least one coating paint.

[0024] The present invention includes, in a wet end of a paper or cardboard machine, a primary application device on at least on one side of the material web having at least one feeding pipe for introducing at least one application medium including at least one organic material to improve both the surface quality and the printability of the material web, and at least one second post-application device downstream of the primary feeding pipe for introducing at least one coating paint.

[0025] The two devices according to the invention again result in the above-mentioned advantages according to the invention.

[0026] With regard to influencing the lateral profile of the at least one applied material (application medium, coating paint), it is advantageous for at least one application device to be sectioned into at least two application sections, and for each section to be separately controlled with respect to their amount applied. It is quite self-evident that the application device can be divided into an unlimited number of application sections and/or, for example, can be adapted to the number and width of the sections of a headbox having a controlled stock density.

[0027] The at least one application device can be embodied or formed as an applicator, a spray jet, or a press roll because these types of devices belong to the proven prior art and, furthermore, can be purchased and operated inexpensively.

[0028] The pressure of the at least one application device, e.g., an applicator or a spray jet, is preferably between about 0.05 bar and about 0.5 bar, preferably between about 0.1 bar and about 0.4 bar. These pressure ranges allow of the application device to be used efficiently and the operational expenses to be taken into account.

[0029] Furthermore, the content of solid matter in the material web according to the invention in the region of the at least one application device is between about 5% and about 60%, preferably between about 8% and about 17%. In contrast, a content of solid matter in the at least one application medium lies between about 5% and about 50%, preferably between about 10% and about 30% because these ranges support the effectiveness of the application in a positive manner.

[0030] Taking into account the aspects of economic efficiency and effectiveness, the total application weight of the at least one application medium per material web surface is in the range between about 1 g/m2 and about 10 g/m2 weight when dry.

[0031] Furthermore, according to the invention, the wet end can include a headbox embodied or formed as a multi-layer headbox and/or a headbox having lamellas. This results in an economical and process technological advantage during the production of the multi-layered material web in that only one or even both of the outer layers of the multi-layered material web can be surfaced with an application medium.

[0032] It is understood that the features of the invention mentioned above and to be explained below can be used not only in the combinations provided, but also in other combinations or alone without departing from the scope of the present invention.

[0033] The present invention is directed to a process for applying a liquid or pasty application medium on a traveling material web. The process comprises forming a material web in a wet end of a web production machine, and applying, via at least one application device in the wet end, at least one application medium on at least one side of the material web. The at least one application medium includes at least one organic material.

[0034] In accordance with a feature of the invention, the at least one application medium can include at least one of a liquid and a pasty medium, and the at least one organic material can improve at least one of surface quality and printability of the material web. Further, the at least one organic material can improve both the surface quality and the printability of the material web.

[0035] According to another feature of the present invention, the material web may include at least one of a paper and a cardboard web.

[0036] The organic material can include a suspension of at least one of cellulose and paper fibers. Each of the at least one of cellulose and paper fibers may have a high refining degree. The high refining degree of each of the at least one of cellulose and paper fibers is greater than or equal to about 50° SR, preferably, greater than or equal to about 70° SR, and most preferably greater than or equal to about 85° SR.

[0037] In accordance with still another feature of the present application, the at least one application medium can be applied in one of the former region and press region.

[0038] Prior to applying the at least one application medium on the material web, the process further can include introducing at least one coating paint into the at least one application medium. The at least one coating paint can include at least one of starch, binder, pigment color, and size.

[0039] Subsequent to applying the at least one application medium on the material web, the process can further include applying at least one coating paint via a second application device arranged, relative to a web travel direction, downstream from the at least one application device. A time difference between applying the at least one application medium and applying the coating paint is within a region of about 1 ms-100 ms, and preferably within the region of about 20 ms-50 ms. Moreover, the coating paint can include components of at least one of an offset ink and gravure ink. Further, the at least one coating paint can include at least one of starch, binder, pigment color, and size.

[0040] In accordance with another feature of the invention, the organic material may include pulp from wood grinding machines.

[0041] The at least one application medium may be applied on only one side of the material web. Further, the at least one application medium can be applied on both sides of the material web.

[0042] According to the invention, the at least one application medium may be applied at least one of directly and indirectly on the material web.

[0043] Further, the at least one application medium can be applied on the material web in a dosed manner.

[0044] The at least one application medium may be applied over an entire width of the material web. The at least one application medium can be applied in a sectioned manner over the entire width of the material web.

[0045] According to another feature of the invention, the web can be a multi-layered material web having two exterior layers formed by a multi-layer headbox and the at least one application medium may be applied on at least one of the two exterior layers.

[0046] The present invention is directed to an apparatus in a web production machine in which at least one application medium is applied on a traveling material web. The apparatus includes at least one application device located in a wet end of the web production machine, which is structured and arranged on at least one side of the material web, and at least one feeding pipe coupled to the at least one application device, which is structured and arranged for introducing at least one application medium includes at least one organic material.

[0047] According to a feature of the instant invention, the at least one organic material may improve at least one of surface quality and printability of the material web. Further, the at least one organic material can improve both the surface quality and the printability of the material web.

[0048] At least one other feeding pipe can be coupled to at least one of the at least one application device and the at least one feeding pipe, and the at least one other feeding pipe can be structured and arranged for introducing at least one coating paint. Further, the at least one coating paint may include at least one of starch, binder, pigment color, and size.

[0049] Moreover, the organic material can include pulp from wood grinding machines.

[0050] The material web may include at least one of a paper and cardboard web. Further, the at least one application medium may include at least one of a liquid and a pasty medium.

[0051] The present invention is directed to an apparatus in a web production machine in which an application medium is applied on a traveling material web. The apparatus includes a primary application device located in a wet end of the machine that is positioned on at least one side of the material web and at least one feeding pipe coupled to the primary application device. The at least one feeding pipe is structured and arranged for introducing at least one application medium including at least one organic material. At least one secondary application device is arranged, relative to a web run direction, downstream from the primary application device, and at least one secondary feeding pipe is coupled to the at least one secondary application device. The at least one secondary feeding pipe is structured and arranged for introducing at least one coating paint.

[0052] According to the invention, the at least one application device may be sectioned into at least two application sections, and each of the at least two application sections can be separately at least one of adjustable and controllable with respect to an application amount.

[0053] The at least one application device can include at least one of an applicator, a spray jet, and a press roll.

[0054] A pressure in the at least one application device may be within a range of between about 0.05 bar-0.5 bar, and preferably within the range of between about 0.1 bar-0.4 bar.

[0055] In a region of the at least one application device, a content of solid matter in the material web can be between about 5% -60%, and preferably between about 8% -17%. Further, a content of solid matter in the at least one application medium is between about 5%-50%, and preferably between about 10% and 30%.

[0056] According to a feature of the instant invention, a total application weight of the at least one application medium for each material web surface can be between about 1 g/m2-10 g/m2 weight when dry.

[0057] In accordance with yet another feature of the present invention, the wet end can include a headbox. The headbox may include a multi-layer headbox. Moreover, the headbox can include lamellas.

[0058] In accordance with yet still another feature of the instant invention, the organic material comprises pulp from wood grinding machines, and the at least one coating paint comprises at least one of starch, binder, pigment color, and size.

[0059] Other exemplary embodiments and advantages of the present invention may be ascertained by reviewing the present disclosure and the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The present invention is further described in the detailed description which follows, in reference to the noted plurality of drawings by way of non-limiting examples of exemplary embodiments of the present invention, in which like reference numerals represent similar parts throughout the several views of the drawings, and wherein:

[0061] FIGS. 1-8 illustrate application devices in accordance with the features of the instant invention.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

[0062] The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the present invention may be embodied in practice.

[0063] An initial embodiment of the application device according to the invention is generally marked 10 in FIG. 1.

[0064] Application device 10 is provided in the wet end of the machine for producing a material web 12, e.g., a paper or cardboard web, which is discernible from FIG. 1 in the still-moist material web 12 being accepted in between two wire belts 14 and 16, which ensure the cohesion of the fibrous structure of material web 12. Material web 12 is guided together with wire belts 14 and 16 around a roll 18 and contacts a wrapping range U at a surface 18a of material web 12. Roll 18 is rotationally driven around its axis A in a rotational direction P (arrow) so that material web 12 is held essentially without slipping in its motion in its travel direction L (arrow) with roll surface 18a of roll 18.

[0065] A headbox positioned upstream of the double wire former provided with two wire belts 14 and 16, e.g., a gap former, is not depicted in FIG. 1 because it is not relevant for the invention and is well known to one trained in the art.

[0066] On a side of material web 12 opposite roll 18 between wire belts 14 and 16, an application installation 20 is provided in the form of an open-jet application installation 22, which is provided at a distance from material web 12 and/or wire belt 16. Application medium 24 is applied on material web 12 and/or wire belt 16 in a predosed manner. Application installation 20 is arranged in the rotational direction P (arrow) downstream of leveling device 26, which comprises a doctor arrangement 28 in the embodiment according to FIG. 1. However, leveling device 26 can be embodied as any known stripping device or leveling device. Leveling device 26 evens the applied application medium 24 and removes any application medium 24 applied in excess in order to reintroduce it into a supply stream M of the free-jet application installation 22 subsequent to an intermediate cleaning step, which is not shown. Additionally, roll 18 is provided with a vacuum zone 30.

[0067] According to the invention, a feeding pipe 32 is allocated to application installation 20 of application device 10 for feeding this installation with at least one organic material 36, e.g., pulp from wood grinding machines, preferably made up of a suspension of cellulose fibers and/or paper fibers, each having a high refining degree with a refining degree of≧about 50° SR, preferably of≧about 70° SR, particularly preferred of≧about 90° SR. Prior to the arrival at the application installation 20, an other feeding pipe 32.1 empties into feeding pipe 32, by which other feeding pipe 32.1 at least one coating paint 34, preferably including components of offset ink or gravure ink, is fed into feeding pipe 32. Application medium 24 is introduced directly into application installation 20 by feeding stream M. The amounts of throughput in the two feeding pipes 32 and 32.1 can be regulated and/or controlled, where the potential types of regulation are considered prior art and thus are not explained in greater detail here. Furthermore, in the region of application device 10 the content of solid matter in material web 12 can be between about 5% and about 60%, preferably between about 8% and about 17%, while the content of solid matter in application medium 24 can be between about 5% and about 50%, preferably between about 10% and about 30%. Preferably, the total application weight of application medium 24 is between about 1 g/m2 and about 10 g/m2.

[0068] FIG. 2 depicts another embodiment of application device 10 according to the invention.

[0069] The material web 12 is supported on a wire belt 14 only on the side facing the roll (embodied as an application roll 18.1). Additionally, application roll 18.1 is not provided with a vacuum zone according to roll 18 in FIG. 1. For example, application roll 18.1 can be a simple deflection roll for material web 12, moved in web travel direction L (arrow) as well. Application medium 24 is applied as an application layer 38 on application roll surface 18.1a by an application installation 20 using a sliding contact. Due to the rotation of application roll 18.1 in the rotational direction P (arrow) around the axis A, application layer 38 is transported to wrapping region U in which application medium 24 is brought into contact with material web 12. Particularly when entering wrapping region U, application medium 24 is pressed into material web 12 due to the hydrodynamic pressure developing between application roll surface 18.1a and material web 12. However, the intermediate layer of wire belt 14 prevents the pressure from reaching values so high that application medium 24 would be pressed into material web 12 up to the volume 12b, but rather remains on surface 12a of material web 12. Further, in the embodiment according to FIG. 2, no mating roll is provided opposite to application roll 18.1 so that material web 12 can evade the existing hydrodynamic pressure as well and, thus, can prevent the intrusion of application medium 24 into the volume of material web 12. Additionally, a cleaning device 19 for cleaning application roll surface 18.1a is allocated to application roll 18.a. Cleaning device 19 includes a delivery device 19.1 for applying a cleaning medium 19.2 on application roll surface 18.1a and a doctor blade 19.2 for removal of contaminants from application roll surface 18.1a.

[0070] According to the invention, a feeding pipe 32 is allocated to application installation 20 of application device 10 for feeding it with at least one organic material 36. Another feeding pipe 32.1 empties into application installation 20 through which optionally at least one coating paint 34, e.g., additives such as starch, binder, pigment color, size, can be introduced. Application medium 24 is then introduced on application roll surface 18.1a by application installation 20. The amounts of throughput can be regulated and/or controlled in both feeding pipes 32 and 32.1 in ways of regulation which are considered prior art and are not explained in greater detail here for this reason.

[0071] FIG. 3 also depicts another embodiment of an application device 10 according to the invention in the double wire zone of a wet end.

[0072] Material web 12 is positioned between the two wire belts 14 and 16 and is motioned in the web travel direction L (arrow). Material web 12 is dewatered in both directions by dewatering elements 40 and 40.1 shown solely by way of example. An initial application installation 20 is provided on the circumference of a first roll 18, for example, a former roll, in order to apply application medium 24 including at least one organic material 36.

[0073] In case an application in the wet end is desired according to the invention on both sides, a second application installation 20.1 can be provided in another double wire region, for example, a wire suction roll supported by a second roll 18.2, in order to apply application medium 24 including at least one organic material 36.

[0074] Furthermore, FIG. 4 shows another embodiment of the application device 10 according to the invention in the double wire zone of a wet end.

[0075] A double wire comprising the two wire belts 14 and 16 is clearly discernible as well as material web 12 guided therebetween and moved in the web travel direction L (arrow). Two wire belts 14 and 16 travel from the right side over an initial roll 18, e.g., a wire suction roll, having an application installation 20 provided on their bottom, transferring an application medium 24, including at least one organic material 36 on the bottom of material web 12. Subsequently, the double wire is guided over a second roll 18.2, e.g., a wire suction roll, wrapped by the bottom of material web 12 with an application installation 20.1 being simultaneously arranged on the side of wire belt 16 applying an application medium 24 including at least one organic material 36 on the top of material web 12. Then, the double wire is guided to a subsequent deflection roll lifting wire belt 16 off material web 12 after which material web 12 being formed is transported further supported on wire belt 14.

[0076] FIG. 5 shows another embodiment of application device 10 according to the invention in a spatial manner.

[0077] The wet end of the fourdrinier wire paper or cardboard machine shown comprises a headbox 42 (sectioning and stock density regulation) known from, e.g., German publication DE 40 19 593 A1 to which high and low consistent fibrous stock suspension flows QH and QL are guided. Headbox 42 evenly spreads the fibrous stock suspension over fourdrinier wire 44, which is deflected around several rolls 46. Further, subsequent to headbox 42, several dewatering elements 40 are provided dewatering material web 12 supported on fourdrinier wire 44.

[0078] According to the invention, downstream of headbox 42 as viewed in machine direction R, a primary application device 48 is provided that is embodied or formed as a spray pipe 48a with several spray jets 48b, only two of which are shown. At least one feeding pipe 50 for applying at least one application medium 24 including at least one organic medium 36 is coupled to spray pipe 48a. A secondary application device 48.1, formed by a spray pipe 48.1a with several spray jets 48.1b, only two of which are shown, coupled to at least one feeding pipe 50.1, for applying at least one coating paint 34, is arranged downstream of a primary application arrangement 48 as viewed in the machine direction R. The two application devices 48 and 48.1 are positioned at a distance such that a time difference for applying the two application media is within a range of about 1 ms to about 100 ms, preferably of about 20 ms to about 50 ms. Furthermore, the pressure in at least one of the two application devices 48 and 48.1 has a value between about 0.05 bar and about 0.5 bar, preferably between about 0.1 bar and about 0.4 bar.

[0079] FIG. 6 shows the embodiment of the invention according to FIG. 5 in a side view and, in turn, FIG. 7 shows a top view of an application device according to FIG. 6.

[0080] The wet end of the fourdrinier wire paper or cardboard machine shown in FIG. 6 essentially comprises the same components as the one shown in FIG. 5, to which reference is hereby made.

[0081] According to the invention, the two application devices 48 and 48.1 are sectioned over the entire width of material web 12, with separate application sections 52 and 52.1 being separately adjustable and/or controllable, in which potential types of regulation are considered prior art and, thus, are not explained in greater detail here. According to FIG. 7, application medium 24 is preferably introduced by a lateral distribution pipe 54 in the application direction 48, then guided over regulating/controlling unit 56 and subsequently applied on the material web (not shown) by a jet 58.

[0082] FIG. 8 shows in a spatial representation a sectioned headbox 42 of another embodiment of the invention with an application medium 24 including at least one organic material 36 introduced into its feeding pipe 32.2 for fibrous suspension 60, by feeding pipes 32.3 and/or at least one coating paint 34 is introduced into its intermediate chamber 62 by a feeding device 64.

[0083] The headbox 42 shown can also be realized in another embodiment of the invention as a headbox using diluting water technology and/or a multi-layered headbox (dot-dash representation) and/or a headbox having lamellas (dot-dash representation). These embodiments result in the above-mentioned advantages.

[0084] In summary, it must be stated that, due to the invention, a device and a method of the type mentioned in the outset were created that improve both the surface quality as well as the printability of the material web with as little technical expense as possible as compared to previous solutions, additionally reducing and/or completely eliminating the migration of coating paint during application of this coating paint into the layers and/or regions of the material web positioned on the inside (by a restrictive layer), as well as achieving an improved retention of this coating paint during dewatering.

[0085] It is noted that the foregoing examples have been provided merely for the purpose of explanation and are in no way to be construed as limiting of the present invention. While the present invention has been described with reference to an exemplary embodiment, it is understood that the words which have been used herein are words of description and illustration, rather than words of limitation. Changes may be made, within the purview of the appended claims, as presently stated and as amended, without departing from the scope and spirit of the present invention in its aspects. Although the present invention has been described herein with reference to particular means, materials and embodiments, the present invention is not intended to be limited to the particulars disclosed herein; rather, the present invention extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims.

LIST OF REFERENCE CHARACTERS

[0086] 10 application device

[0087] 12 material web

[0088] 12a surface

[0089] 12b volume

[0090] 14, 16 wire belt

[0091] 18, 46 roll

[0092] 18.1 application roll

[0093] 18.1a application roll surface

[0094] 18a roll surface

[0095] 19 cleaning device

[0096] 19.1 delivery device

[0097] 19.2 cleaning medium

[0098] 19.3 doctor blade

[0099] 20 application installation

[0100] 22 free-jet application installation

[0101] 24 application medium

[0102] 26 leveling device

[0103] 28 doctor arrangement

[0104] 30 vacuum zone

[0105] 32, 32.1, 32,2, 32.3 feeding pipe

[0106] 34 coating paint

[0107] 36 organic material

[0108] 38 application layer

[0109] 40, 40.1 dewatering element

[0110] 42 headbox

[0111] 44 fourdrinier wire

[0112] 48 primary application device

[0113] 48.1 secondary application device

[0114] 48a, 48.1a spray pipe

[0115] 48b, 48.1b spray jet

[0116] 50, 50.1 feeding pipe

[0117] 52, 52.1 application section

[0118] 54 lateral distribution pipe

[0119] 56 adjustment/control unit

[0120] 58 jet

[0121] 60 fibrous stock suspension

[0122] 62 intermediate chamber

[0123] 64 feeding device

[0124] A axis

[0125] L web travel direction (arrow)

[0126] M feeding flow

[0127] P rotational direction (arrow)

[0128] QH, QL fibrous stock suspension flow

[0129] R machine direction (arrow)

[0130] U wrapping region

Claims

1. A process for applying a liquid or pasty application medium on a traveling material web comprising:

forming a material web in a wet end of a web production machine;

applying, via at least one application device in the wet end, at least one application medium on at least one side of the material web,

wherein the at least one application medium comprises at least one organic material.

2. The process in accordance with claim 1, wherein the at least one application medium comprises at least one of a liquid and a pasty medium, and

wherein the at least one organic material improves at least one of surface quality and printability of the material web.

3. The process in accordance with claim 2, wherein the at least one organic material improves both the surface quality and the printability of the material web.

4. The process in accordance with claim 1, wherein the material web comprises at least one of a paper and a cardboard web.

5. The process in accordance with claim 1, wherein the organic material comprises a suspension of at least one of cellulose and paper fibers.

6. The process in accordance with claim 5, wherein each of the at least one of cellulose and paper fibers has a high refining degree.

7. The process in accordance with claim 6, wherein the high refining degree of each of the at least one of cellulose and paper fibers is greater than or equal to about 50° SR.

8. The process in accordance with claim 7, wherein the high refining degree is greater than or equal to about 70° SR.

9. The process in accordance with claim 7, wherein the high refining degree is greater than or equal to about 85° SR.

10. The process in accordance with claim 1, wherein the at least one application medium is applied in one of the former region and press region.

11. The process in accordance with claim 1, wherein, prior to applying the at least one application medium on the material web, the process further comprises introducing at least one coating paint into the at least one application medium.

12. The process in accordance with claim 11, wherein the at least one coating paint comprises at least one of starch, binder, pigment color, and size.

13. The process in accordance with claim 1, wherein, subsequent to applying the at least one application medium on the material web, the process further comprises applying at least one coating paint via a second application device arranged, relative to a web travel direction, downstream from the at least one application device.

14. The process in accordance with claim 13, wherein a time difference between applying the at least one application medium and applying the coating paint is within a region of about 1 ms-100 ms.

15. The process in accordance with claim 14, wherein the time difference is within the region of about 20 ms-50 ms.

16. The process in accordance with claim 13, wherein the coating paint comprises components of at least one of an offset ink and gravure ink.

17. The process in accordance with claim 13, wherein the at least one coating paint comprises at least one of starch, binder, pigment color, and size.

18. The process in accordance with claim 1, wherein the at least one application medium is applied on only one side of the material web.

19. The process in accordance with claim 1, wherein the at least one application medium is applied on both sides of the material web.

20. The process in accordance with claim 1, wherein the at least one application medium is applied at least one of directly and indirectly on the material web.

21. The process in accordance with claim 1, wherein the at least one application medium is applied on the material web in a dosed manner.

22. The process in accordance with claim 1, wherein the at least one application medium is applied over an entire width of the material web.

23. The process in accordance with claim 22, wherein the at least one application medium is applied in a sectioned manner over the entire width of the material web.

24. The process in accordance with claim 1, wherein the web comprises a multi-layered material web having two exterior layers formed by a multi-layer headbox and the at least one application medium is applied on at least one of the two exterior layers.

25. An apparatus applying at least one application medium on a traveling material web in a web production machine, comprising:

at least one application device located in a wet end of the web production machine, which is structured and arranged on at least one side of the material web;

at least one feeding pipe coupled to said at least one application device, which is structured and arranged for introducing at least one application medium comprising at least one organic material.

26. The apparatus in accordance with claim 25, wherein the at least one organic material improves at least one of surface quality and printability of the material web.

27. The apparatus in accordance with claim 26, wherein the at least one organic material improves both the surface quality and the printability of the material web.

28. The apparatus in accordance with claim 25, further comprising at least one other feeding pipe coupled to at least one of said at least one application device and said at least one feeding pipe,

said at least one other feeding pipe being structured and arranged for introducing at least one coating paint.

29. The process in accordance with claim 28, wherein the at least one coating paint comprises at least one of starch, binder, pigment color, and size.

30. The apparatus in accordance with claim 25, wherein the material web comprises at least one of a paper and cardboard web.

31. The apparatus in accordance with claim 25, wherein the at least one application medium comprises at least one of a liquid and a pasty medium.

32. The process in accordance with claim 25, wherein the organic material comprises pulp from wood grinding machines.

33. An apparatus in a web production machine in which an application medium is applied on a traveling material web, comprising:

a primary application device located in a wet end of the machine that is positioned on at least one side of the material web;

at least one feeding pipe coupled to said primary application device, said at least one feeding pipe being structured and arranged for introducing at least one application medium comprising at least one organic material;

at least one secondary application device arranged, relative to a web run direction, downstream from said primary application device;

at least one secondary feeding pipe coupled to said at least one secondary application device, said at least one secondary feeding pipe being structured and arranged for introducing at least one coating paint.

34. The apparatus in accordance with claim 33, wherein the at least one organic material improves at least one of surface quality and printability of the material web.

35. The apparatus in accordance with claim 34, wherein the at least one organic material improves both the surface quality and the printability of the material web.

36. The apparatus in accordance with claim 33, wherein the material web comprises at least one of a paper and cardboard web.

37. The apparatus in accordance with claim 33, wherein the at least one application medium comprises at least one of a liquid and a pasty medium.

38. The apparatus in accordance with claim 33, wherein said at least one application device is sectioned into at least two application sections, and

wherein each of said at least two application sections is separately at least one of adjustable and controllable with respect to an application amount.

39. The apparatus in accordance with claim 33, wherein said at least one application device comprises at least one of an applicator, a spray jet, and a press roll.

40. The apparatus in accordance with claim 33, wherein a pressure in said at least one application device is within a range of between about 0.05 bar-0.5 bar.

41. The apparatus in accordance with claim 40, wherein the pressure is within the range of between about 0.1 bar-0.4 bar.

42. The apparatus in accordance with claim 33, wherein, in a region of said at least one application device, a content of solid matter in the material web is between about 5%-60%.

43. The apparatus in accordance with claim 42, wherein the content of solid matter in the material web is between about 8%-17%.

44. The apparatus in accordance with claim 42, wherein a content of solid matter in the at least one application medium is between about 5%-50%.

45. The apparatus in accordance with claim 44, wherein the content of solid matter in the at least one application medium is between about 10% and 30%.

46. The apparatus in accordance with claim 33, wherein a total application weight of the at least one application medium for each material web surface is between about 1 g/m2-10 g/m2 weight when dry.

47. The apparatus in accordance with claim 33, wherein said wet end includes a headbox.

48. The apparatus in accordance with claim 47, wherein said headbox comprises a multi-layer headbox.

49. The apparatus in accordance with claim 47, wherein said headbox includes lamellas.

50. The process in accordance with claim 33, wherein the organic material comprises pulp from wood grinding machines, and the at least one coating paint comprises at least one of starch, binder, pigment color, and size.