DE102009027304A1 - Method for influencing surface texture of e.g. press felt in machine that is utilized for producing e.g. paper web, involves exerting surface pressures by smooth press belts within treatment area on two sides - Google Patents

Abstract

The method involves smoothing an exterior (2') of a covering semifinished product (1') intended to a support of a fibrous web, and compressing by exerting pressure of a smooth surface against the exterior of the product. The product is guided with an extended press gap (9) through a double belt press arrangement (8), where the gap is formed between two press belts (13.1) and describes a treatment area (10) extending in a longitudinal and transverse direction of the arrangement. Surface pressures (P1, P2) are exerted by the smooth press belts within the treatment area on two sides. An independent claim is also included for a device for forming a covering in a machine to produce a fibrous web.

Description

The The invention relates to a method for influencing the surface structure a covering, in particular a press felt or drying belt for use in a machine for making a Fibrous web in the form of a paper, board or tissue web, at which provided for supporting the fibrous web Outside of a semi-finished fabric by exercising a pressure of a smooth surface smoothed against this and compacted.

The The invention further relates to a device for producing a Covering and a covering.

coverings for use in machines for the production of fibrous webs are in different versions from the state of the Technique depending on their arrangement and function previously known. However, just have moisture absorbing and laxative Coverings in the form of press felts or drying tapes, which the fibrous web often contact a strong Marking propensity by the topography of her for support the fibrous web provided surface. These will used in areas in which the fibrous web still through a relatively high moisture content is characterized and therefore easily deformed.

To reduce the marking tendency is in the unpublished DE 10 2008 040 053 a drying belt for a condensation drying device with a, the dimensional stability of the band substantially providing basic structure, which consists of a polyethylene and / or PCTA and / or PCT and / or PEEK and / or PPS and / or a high temperature resistant PA comprising thread material and by a The fibrous nonwoven layer comprises a first polymer material disposed at least in the region of the outside and the nonwoven fabric layer in the region. The fibrous nonwoven layer comprises at least on the outer side a web material contact side of the drying belt; the outer side of the sheet material contact side is densified and calendered by hot calendering above the melting temperature of the first polymer material.

In contrast, from the document WO 2005/098128 A1 an embodiment of a press felt for use in the press section of a machine for making a fibrous web having a nonwoven layer bonded and bonded to one of its surfaces by a thermoplastic binder material adjacent to that surface, wherein the surface of the nonwoven layer is pressurized with a smooth surface during their cooling is smoothed from the temperature above the melting temperature of the thermoplastic binder material to a temperature below this melting temperature, previously known. In this case, the uppermost nonwoven layer is set with the smooth surface under pressure, if it has a temperature above the melting temperature of the thermoplastic binder material. This has melted. Unlike pure calendering, however, the smooth surface pressure is maintained until the top nonwoven layer cools to a temperature below the melt temperature of the thermoplastic binder material and solidifies. This solidifies the shape of the top nonwoven layer and its surface in a certain state, the surface smoothness being determined by the smoothness of the surface with which the pressure is applied. This results in a very smooth surface.

Both Methods are suitable for producing surfaces, largely characterized by a smooth surface are. For this purpose, the intended for supporting surface deals with what appropriate facilities are used in which the semi-finished fabric in terms of its orientation externally and internally reversed shape in this corresponding guide elements is performed. However, there is still a tendency to mark. The one-sided Treatment of intended to support the fibrous web Surface requires a special version of the Device for influencing the surface structure. Furthermore, such a device does not allow any defined Training the other side of the fabric.

Of the The invention is therefore based on the object, a method for influencing the surface structure of a fabric and a device for Production of a covering of the type mentioned in such a way, that the marking tendency at the contacting the fibrous web Outside of the fabric to be produced is reduced.

The solution according to the invention is characterized by the features of claims 1, 17, 26 and 27 characterized. advantageous Embodiments are described in the subclaims.

A method for influencing the surface structure of a fabric, in particular a press felt or drying belt for use in a machine for producing a fibrous web in the form of a paper, board or tissue web, in which the for supporting the fibrous web provided outer side of a semi-finished fabric is smoothed and compacted by exerting a pressure of a smooth surface against this is characterized in that the semi-finished fabric by at least one double belt press assembly with a formed of two smooth press belts extended and extending in the longitudinal and transverse direction of the double belt press assembly treatment zone descriptive press nip is performed and within the treatment zone on both sides of a surface pressure on the smooth press belts is applied to this.

Under A fabric according to the invention are bands for Support and / or the transport of fibrous webs understood, which includes other features, such as the take over at least temporary recording and storage of fluids can. These can be in the form of an endless loop present, which consist of one or a plurality of one above the other arranged layers, in particular textile fabrics and further comprising one or more longitudinally the fabric arranged behind one another identically constructed textile Structures that are connected to each other can be formed.

at A semi-finished fabric in the sense of the invention is is a product formed during the manufacture of clothing or intermediate, which temporally and / or locally displaced or immediately following the preparation of the intermediate product fed to a surface-influencing treatment step or can be suspended. The intermediate may be in different Form and includes at least one layer in the form of a textile Sheet, which by larger Dimensions characterized in the longitudinal and transverse directions is as in the height direction and in the form of a fleece, a fabric, a knitted fabric, a knitted fabric or a fabric may be present, further in the form of a substrate.

The Press belts are for this purpose as endless circulating belts, preferably carried out rings that are against the semi-finished fabric be pressed. These are designed such that their, the Cover semi-finished product touching surface is suitable on the outside, the desired topography to produce on the surface of the semi-finished fabric. The surface of the press belts is as smooth, preferably polished surface executed.

When Press belts are preferably used metal bands use. Conceivable examples are materials such as CrNiCuTi 15 7.

The Thickness variation of the bands used is <10 μm. The surface roughness Ra of the ribbons is preferably in the range of 0.05 μm to 0.5 μm, preferably from 0.05 μm to 0.10 μm, especially preferably 10 microns. The tensile strength is in the range between 1400 MPa to 1800 MPa. The tensile strength at maximum temperature is preferably in the range of 1200 MPa to 1300 MPa.

The Vickers hardness HV10 at the strip surface is preferably between 450 and 500.

The chemical composition of the tape can be chosen, for example, according to the following example:
C = 0.08%, Si = 1.5%, Mn = 1%, Cr = 14%, Ni = 7%, Ti = 0.3%, Mo = 0.8%.

When Grinding process to achieve the required surface roughness find virtual reference grinding or 3DG three-dimensional Grinding use.

In the simplest case, belts are used which have a chrome-plated surface, with which all grinding marks are eliminated in a complex grinding process. In detail, for example, on http://www.held-tech.de directed. This embodiment is exemplary. Also conceivable are other designs.

When Find materials for the press belts used Steel, stainless steel and alloys use.

The inventive solution offers due to the use of a double belt press with extended, extending in the direction of execution of the semi-finished fabric press nip the advantage of a considerable time over conventional manufacturing process prolonged pressurization of the semi-finished fabric and thus compaction at least in the region of the surface on the intended to support the fibrous web outside. As a result of the press-gap geometry produced thereby, in particular its length in the direction of passage and height perpendicular thereto, the semi-finished fabric is compressed to a predefined thickness and, moreover, the surface topography is influenced in such a way that it is free from marks on unevennesses producing a fibrous web to be supported. Due to the long, by the length of the press nip and the passage speed through this particular residence time is an irreversible and uniform action on the surface of the outside of the fabric forming material, so that no relief occurs even after discharge from the press nip. Smoothing the surface of the Covering can be achieved purely mechanically by pressure or in combination with the targeted adjustment of other physical parameters, in particular temperature increases or reductions.

The Inventors have recognized that in known methods for the production smooth surfaces due to superficial coating the fibrous web contacting outside or but merging of the outside forming layer, in particular the fibers within the situation, one-sided treatment of the surface is insufficient to reduce the marking tendency and complete exclude why the one-sided treatment by replaced a two-sided effect on the semi-finished product has been.

In Dependence of the design of the single double belt press arrangement as isobaric or isochoric press arrangement, the resulting surface pressure the on the smooth press belts on both sides the semifinished product is subject to flat pressures within the entire treatment area in the direction of passage the untreated clothing be kept constant or the through the press nip within the entire treatment area guided semi-finished product volume.

According to one first embodiment, the thickness of the fabric and / or the surface structure of the to support the Fiber web provided outside of the fabric in Dependence of at least the resulting surface pressure the on the smooth press belts on both sides the semifinished product over the area set the treatment area, preferably controlled. The Control of the resulting surface pressure can by Control of the surface pressure at least one, preferably Both press belts done.

there is preferably used in isobaric double belt press assemblies resulting surface pressure over the smooth Press bands on both sides of the semi-finished fabric applied area pressures within the Treatment area by controlling at least the surface pressure on the intended for supporting the fibrous web outside of the semi-finished fabric set freely while the other on the opposite side of the semi-finished fabric applied pressure to a fixed value or also free is adjustable. In the first case, the control engineering effort be minimized considerably and made the adjustment directly to the press belt be provided at the for supporting the fibrous web Surface is effective. This is in an advantageous Further development of the surface pressure of the on to the support the fibrous web provided outside of the semi-finished fabric acting press belt higher than the surface pressure of the oppositely directed inside of the semi-finished fabric set effective pressing belt. In the second case, the setting made considerably more sensitive.

In a second embodiment with an isochronous double belt press arrangement becomes the distance describing the height of the press nip the two pressing bands on the extension of the Treatment zone kept constant and thus a constant volume of clothing set. The area pressures are dependent the surface conditions on the semi-finished fabric adapted to maintain the distance and are therefore adjustable.

Especially is the pressure distribution in the longitudinal direction of the press nip and preferably freely adjustable in the transverse direction.

In an advantageous development is the thickness of the fabric and / or the surface structure of the support the fibrous web provided outside of the fabric in addition to the stated basic designs depending on the temperature and / or temperature distribution controlled the extension of the treatment area. By a defined Temperature and pressure distribution within the treatment area can produce the desired surface properties be targeted. In particular, it can be achieved through targeted coordination the effect of pressure exerted by influencing the condition the surface areas are reinforced.

In According to a further advantageous embodiment, the thickness the covering and / or the surface structure at least the intended for supporting the fibrous web outside the clothing also depends on the temperature outside of the Treatment area to be controlled. This is especially true for a heating of the semi-finished fabric before the entry into the Pressing gap and cooling after the spout. The temperature For this purpose, it is preferably in the guiding direction of the semi-finished fabric set in zones.

In a particularly advantageous embodiment, the temperature acting on the semi-finished fabric product is chosen such that a melting of the surface, in particular before or during the pressure action is achieved. This makes it possible to apply coatings on the surface, in particular polymers for Oberflächenmodifi cation, which form a smooth surface by the method according to the invention, such. As polyurethanes, which are used as aqueous dispersion or z. B. be applied as granules before the inlet gap.

The Semi-finished fabric can be used as an endless belt or in unwound Form guided by the double belt press arrangement and only later connected to a loop at the ends. The latter option offers the advantage of a free arrangement the double belt press assembly as well as the universal use which considerably simplifies their execution, since this is universal be used for a variety of clothing lengths can. Depending on the setting, the process parameters the one acting on the individual sides of the semi-finished fabric Press belts the properties of at least one, preferably both Pages can be targeted. A complex turning of the clothing after the treatment can be omitted.

The Device for producing a covering, in particular a Press felt or drying tape for use in one Machine for producing a fibrous web in the form of a paper, Carton or tissue web comprising a means for training and / or influencing the surface structure of a semi-finished fabric, is characterized in that the device for training and / or influencing the surface structure of a semi-finished fabric at least one double belt press assembly with two each a press belt comprising pressing elements, which in the direction of passage of the Semi-finished semi-finished product extending a treatment area Form press nip.

there is according to a first embodiment, the at least a double belt press assembly as an isobaric double belt press assembly executed, each comprising at least one on the inside of the Press belt acting pressing unit. This one is about set the treatment area constant surface pressure, which for forming the fabric with a constant thickness and a desired smooth surface leads.

In an alternative embodiment, the at least one double belt press arrangement be executed as an isochore double belt press arrangement, in particular comprising one each the inside of the individual Press belt supporting roll carpet. That way defined height of the press nip over the treatment area offers the advantage of creating compacted smooth surfaces with constant thickness of the clothing.

Around in addition a fusion of constituents of the surfaces to achieve forming layers and / or the effect of pressure too amplify, is preferably at least one device for at least indirectly influencing the temperature of the surface of the semi-finished fabric. The at least one device for at least indirectly influencing the temperature of the surface of the semi-finished fabric can be used in the institution for training the surface of the fabric are integrated, preferably in the pressing unit. Conceivable, however, is the additional or alternative arrangement in front of or behind the double belt press assembly. As a result, the process for influencing the surface can continue be modified.

The Device for forming the surface can be used for Manufacture of a fabric used, the fabric thereby by an average roughness in the range of Sa 1.4 to 10, particularly preferably Sa 2.0 to 5 at the fibrous web contacting Side is characterized. Sa corresponds to the surface code the average height. Roughness of a foil impression from a felt surface at a pressure of 5 MPa. The Roughness of the felt surface in direct measurement is in the range of 20 microns to 40 microns, particularly preferred 25 μm to 30 μm.

Under roughness after DIN 4760 In this case, design deviations of technical surfaces are understood.

The Device for forming the surface of a fabric and the inventive method are included not on a specific structure of a semi-finished fabric and limited from this to be produced string. These can be single-layered or multi-layered, with the support the fibrous web provided surface, for example directly from a location, or one connected to a ground structure further layer or coating can be formed.

The solution according to the invention is hereinafter explained with reference to figures. In detail is the following shown:

1 shows on the basis of a section of a guide assembly in a machine for producing a fibrous web an embodiment of a fabric according to the invention;

2a shows a section of a device for forming the surface of a fabric with an isobaric double belt press assembly;

2 B shows a section of an on direction for forming the surface of a fabric with an isochronous double belt press assembly;

3 clarifies a further development according to 2a with integrated in the treatment zone device for at least indirectly influencing the temperature of the semi-finished fabric product;

4 shows an embodiment with series connection of two double belt press assemblies;

5 illustrates exemplary arrangement possibilities of other devices for at least indirectly influencing the temperature of the semi-finished fabric product;

The 1 illustrates in schematic simplified representation of an inventively designed string 1 , in particular in the form of a pressing or drying belt for use in machines for producing material webs, in particular fibrous webs in the form of paper, board or tissue webs based on a section of a guide arrangement 7 such a fabric 1 , To clarify the individual directions is to the guide assembly 7 as well as the clothing 1 even a coordinate system created. The X direction describes the direction of passage of the clothing 1 supported fibrous web F by the machine, which is also referred to as the machine direction MD. The Y direction corresponds to the width or cross machine direction CD. The Z direction describes the height direction.

The covering 1 serves in a known manner the leadership of the fibrous web F through the machine, in particular by individual functional units for the purpose of dewatering and increasing the dry content. At execution of the covering 1 in the form of a press felt with an arrangement within a press section, this serves to take over the fibrous web F from a transferring unit, the recording of the fluid released by the fibrous web F through a press nip, the at least temporary storage and delivery, and the transfer of the fibrous web F to a acquiring entity. When executed as a drying belt, in particular drying felt is the covering 1 essentially the support of the fibrous web F when passing through a drying device. In each function, the fibrous web F undergoes support by the covering at least along a partial area of its guide path 1 , The covering 1 lies as an endlessly circulating belt with a predefined thickness d in the form of a loop with an outside 2 and an inside 3 before, the surface 4 on the outside 2 the support of the fibrous web F is used. The surface 4 on the outside 2 a fabric produced by the method according to the invention 1 is characterized by a Sa value in the range of 1.4 to 10, more preferably 2.0 to 5.

This average roughness is not or not solely by the application of a coating and / or fusion of fibers or other components of the outside 2 the clothing 1 realizing nonwoven layers, but according to the invention in the manufacture of the fabric 1 a semi-finished fabric 1' by at least one double belt press arrangement 8th guided and within the extended press nip 9 formed treatment zone 10 by targeted adjustment of the process parameters to a predefined thickness d and / or surface quality of at least the surface intended to support the fibrous web F. 4 spent. As a process parameter in particular the surface pressure on the later surface 4 forming outside 2 ' , the temperature, which the semi-finished fabric 1' when passing through the double belt press assembly 8th is suspended and / or the height h of the press nip 9 the double belt press arrangement 8th Understood.

The production of the covering 1 can be done in different ways depending on their structure and their structure. It is crucial that in one of the last steps of the manufacturing process the later the surface 4 forming surface 4 ' of the semi-finished fabric 1' a facility 6 for the formation of the surface 4 the clothing 1 to achieve a predefined thickness d and / or surface roughness is supplied. The semi-finished fabric 1' can either be in a device 5 for producing a fabric 1 manufactured in an upstream step and then inside the device 5 the device 6 for the formation of the surface 4 the clothing 1 be supplied or temporally and spatially offset to this separately prepared, stored and the desired completion of the device 6 for the formation of the surface 4 be supplied. To clarify the individual directions is to the device 5 , especially the device 6 a coordinate system created. The X direction describes the extension in the direction of passage of the semi-finished fabric 1' , the Y direction the width direction and the Z direction the height direction.

After passing through the semi-finished fabric 1' through the device 6 Already the finished end product in the form of the stringing 1 with the desired thickness d and / or the required Surface quality present or there are still further steps for surface treatment provided. The device 6 comprises according to the invention at least one press arrangement in the form of a so-called double belt press arrangement 8th , This works continuously and forms in the direction of passage for the semi-finished fabric 1' , ie the still untreated covering extended press nip 9 which is a treatment area 10 for the semi-finished fabric 1' describes. Within the treatment area 10 which extends in the direction of passage of the semi-finished fabric 1' and across this over the extension of the semi-finished fabric 1' extends in the width direction, the surface pressure and / or the temperature for acting on the still untreated semi-finished product 1' set. The treatment area 10 is in each case by a two-dimensional effective range 11.1 and 11.2 the individual pressing elements 12.1 and 12.2 the double belt press arrangement 8th characterized. Every single pressing element 12.1 . 12.2 includes a so-called press belt 13.1 and 13.2 , which is designed as an endless circulating belt and at least two guide rollers 14:11 . 14:12 and 14:21 and 14:22 is guided, which are referred to as drums. The in the direction of execution at the inlet 15 in the press nip 9 arranged and the press belts 13.1 . 13.2 supporting or leading rollers 14:11 . 14:21 are also referred to as inlet drum, while the other in the direction of passage through the double belt press arrangement 8th this downstream, at the outlet 16 arranged rollers 14:12 . 14:22 form the outlet drums, which are preferably designed to be driven. Within the of the two pressable effective ranges 11.1 . 11.2 the endless revolving press belts 13.1 . 13.2 between the enema 15 and the spout 16 formed extended press nip 9 , becomes the semi-finished fabric 1' at least with a pressure over a predefined area, preferably applied to the entire surface. This over the press belts 13.1 . 13.2 on the semi-finished fabric 1' in each case acting surface pressure p1 and p2 is dependent on the design of the double belt press arrangement 8th as an isobaric press system constant over the treatment zone 10 or variably adjustable for execution as isochores press system. The area of pressure application forms the pressure area 17 , Be within the treatment area 10 other parameters, such as the temperature, which the semi-finished fabric 1' is suspended, this area of active influence is also called the reaction area 18 designated. Ideally, the pressure range will overlap 17 and the reaction area 18 complete and together form the treatment area 10 ,

According to a first embodiment of the solution according to the invention, as in 2a is shown, the double belt press assembly 8th as an isobaric double belt press arrangement 19 educated. This system is characterized by the fact that the surface pressure p _res resulting from the individual surface pressures p1 and p2 points to the semi-finished fabric 1' over the entire treatment area 10 is kept constant.

Every pressing element 12.1 . 12.2 the isobaric double belt press arrangement 19 includes a pressing unit for this purpose 24.1 . 24.2 on the inside 21.1 . 21.2 of the respective press belt 13.1 . 13.2 takes effect. The pressing unit 24.1 . 24.2 can be designed in various ways and in the simplest case comprises a pressure element 20.1 . 20.2 , in particular a pressure plate, which at least indirectly on the inside 21.1 and 21.2 of the respective press belt 13.1 . 13.2 takes effect. This can either directly or indirectly depending on the design by generating at least one pressure pad 22.1 . 22.2 each between the inside 21.1 and 21.2 of the respective press belt 13.1 and 13.2 and the pressure element 20.1 . 20.2 or the pressure plate on the inside 21.1 . 21.2 be effective. About the between the pressure element 20.1 . 20.2 and the inside 21.1 . 21.2 of the press belt 13.1 . 13.2 producible pressure pad 22.1 . 22.2 as well as the surface pressures p1, p2 which can be applied above this, the surface pressure p _res in the press nip can 9 can be adjusted, preferably embodiments are sought, the control of the pressure pad 22.1 . 22.2 within the two press units 12.1 . 12.2 in such a way that the desired thickness d and / or surface roughness at the surface are determined by the surface pressure p _res 4 ' of the semi-finished fabric 1' is adjusted, which then on the end product in the form of the covering 1 is present.

This is when passing through the fabric 1' through the double belt press assembly 8th the required pressure resulting from the pressures prevailing over the surface within the two press units 12.1 and 12.2 composed, at the surface 4 to achieve the desired result in the form of the predefined surface roughness preferably controlled, regulated in a particularly advantageous manner.

The surface pressure p _res over the entire treatment area 10 is constant, so on the entire surface 4 ' of the semi-finished fabric 1' when passing through the press nip 9 same conditions prevail. In this case, as a rule, a constant thickness d of the clothing 1 generated.

In an alternative embodiment, in the 2 B instead of an isobaric double belt press arrangement 19 an isochore double belt press order 23 used. This is the treatment zone 10 designed and executed such that the semi-finished fabric 1' through a press nip 9 with a constant height h is performed. In the isochoric double belt press arrangement 23 is the press unit 24.1 and 24.2 , which at least indirectly on the insides 21.1 . 21.2 of the respective press belt 13.1 . 13.2 acts, carried out such that by means of this a constant distance h between the press belts 13.1 . 13.2 is trained. The pressing unit 24.1 . 24.2 In the simplest case, this includes the inside 21.1 . 21.2 the press belts 13.1 . 13.2 supporting and leading roller carpet.

The contact units 24.1 . 24.2 in the case of the individual double-belt press arrangements operating according to different functional principles 19 and 23 each act at least indirectly on the inside 21.1 . 21.2 of the respective press belt 13.1 . 13.2 to achieve the desired end product in the form of clothing 1 , where in the 2a illustrated isobaric system characterized in that the pressure within the treatment zone 10 extending over a portion of the press nip 9 extends in the machine direction in the direction of passage and transverse to this, is constant. The print attempts to compensate for local unevennesses on the surface. In contrast, the design illustrates as an isochoric pressing system in 2 B a possibility for the production of clothing 1 of constant thickness over their extension in the longitudinal and transverse directions by setting a constant distance between the press belts 13.1 . 13.2 over the entire pressure zone 17 , preferably the entire treatment area 10 and thus a constant height h of the press nip 9 in the treatment area 10 ,

Regarding the concrete execution of such isobaric or isochoric double belt press arrangements 19 . 23 Reference may be made to known designs from the state of the art, for example the production of kitchen countertops and other laminates, which is why detail is not discussed here on the structural design. Decisive here is the different structure of the Anpresseinheiten 24.1 . 24.2 as well as the assignment of control devices, not shown here to these. Representative is here on executions accordingly http://www.schott-meissner.de and mistakes! Hyperlink reference invalid.

The 2a and 2 B illustrate only the versions of the double belt press assemblies 19 . 23 to exert pressure within the treatment zone 10 , In a particularly advantageous embodiment, it is also according to 3 the example of a double belt press arrangement 8th provided additional features within the treatment area 10 integrate so that this next to a print area 17 also a reaction area 18 includes. Preferably, a complete superposition of reaction area 18 and pressure range 17 ; so that at the same time a temperature influence takes place in the effective pressure range. It is also conceivable, only a portion of the printing area 17 as reaction area 18 perform. It may be the device 6 for forming the surface next to the Anpresseinheiten 24.1 . 24.2 also a facility 25.1 . 25.2 for at least indirectly influencing the temperature of the surface 4 ' of the semi-finished fabric 1' which preferably also in the double belt press arrangement 8th is integrated with, preferably directly to the Anpresseinheiten 24.1 . 24.2 is assigned or is formed by these with.

3 illustrated by the example of an embodiment according to 2 an integration of the facilities 25.1 . 25.2 in the press units 24.1 . 24.2 exemplified by coupling to or integration in the printing elements 20.1 . 20.2 , whereby an indirect heating or cooling of the semi-finished fabric 1' can be done via the pressure pad. Shown here is also an example of the subdivision of the reaction region 18 into individual subzones 18.1 to 18.n , which on the zonal in the direction of passage division of the device 25.1 . 25.2 is made, and in which different temperatures can be adjusted.

Also conceivable is a zonal subdivision of the devices (not shown here) 25.1 . 25.2 transverse to the double belt press arrangement 8th ,

The 3 illustrates a particularly advantageous embodiment with complete overlap of reaction area 18 and pressure range 17 , It is also conceivable the possibility not shown here, only a partial overlap between pressure range 17 and reaction area 18 provided.

The 4 illustrates an advantageous development of the device 6 to form the surface intended to support the fibrous web 4 a stringing 1 , This comprises at least two sequentially arranged in series double belt press assemblies, here 8.1 . 8.2 , These are successively from the semi-finished fabric 1' run through. In this case, the individual double belt press arrangements 8.1 and 8.2 each be designed as isobaric or isochoric double belt press arrangements. The first double belt press arrangement in the direction of passage 8.1 is designed and constructed so that it is suitable, the semi-finished fabric 1' to heat and to calibrate the thickness and pressure as well as the temperature while the downstream second double belt press assembly 8.2 for cooling the semi-finished fabric 1' under pressure. For this purpose, here is the first press arrangement 8.1 each in both press belts Anpresseinheiten 24.11 . 24.12 on that the pressure area 17.1 describe which is over the entire treatment area 10.1 extends. Furthermore, for the purpose of heating, at least EACH is a device 25.11 . 25.12 provided, which preferably with the Anpresseinheiten 24.11 . 24.12 is combined into a structural unit. The reaction area formed thereby 18.1 is exemplary identical to the treatment area 10.1 , Also the second double belt press arrangement 8.2 has a pressure zone 17.2 descriptive contact units 24.21 . 24.22 whose effective ranges are the treatment area 10.2 correspond. However, here are examples of facilities in the area of the inlet or this 25.21 . 25.22 for at least indirectly influencing the temperature of the semi-finished fabric 1' provided, which are preferably designed as cooling devices and a defined cooling of the semi-finished fabric 1' under pressure in the treatment area 10 allow. Exemplary is that of the institution 25.21 . 25.22 certain reaction area 18.2 arranged such that this only partially the pressure range 17.2 covered. Again, the facilities are also exemplary 25.21 . 25.22 with the press units 24.21 . 24.22 combined into a structural unit.

It It goes without saying that depending on the requirements also other arrangements and designs, in particular the arrangement and assignment of reaction and pressure areas to each other as well as the arrangement of these descriptive devices to each other, are possible.

The 5 illustrates a further development, as they are for individual double belt press arrangements 8th or connected in series double belt press arrangements can be used. In this, the respective double belt press arrangement 8th with a treatment area 10 downstream institution 25b for at least indirectly influencing the temperature of the double-belt press arrangement 8th treated semi-finished product 1' , Preferably at least one cooling device, particularly preferably one on a surface, here the surface 4 effective cooling shoe 26 combined. This is the respective double belt press 8th downstream in the direction of passage and serves for rapid cooling and fixing of the surface 4 , Also shown by way of example is a pre-circuit of a device 25a for at least indirectly influencing the temperature of the semi-finished fabric 1' , preferably in the form of a heating device. Both devices are exemplary only the surface intended to support the fibrous web 4 the string forming outside 2 ' of the semi-finished fabric 1' assigned.

1

covering

1'

Covering semi-finished product

2

outside

2 '

outside of the semi-finished fabric

3

inside

4

surface

4 '

Surface on the outside of the semi-finished fabric 1

5

contraption for producing a fabric

6

Device for influencing the surface 4 ' a stringing 1'

7

guide assembly

8th

Double belt press arrangement

8.1 8.2

Double belt press arrangements

9 9.1, 9.2

press nip

10 10.1, 10.2

treatment zone

11.1, 11.2

flat effective range

12.1, 12.2

press member

13.1, 13.2

press belt

11/14, 14.12, 14.21, 14.22

Roller, drum

15

enema

16

outlet

17 17.1, 17.2

pressure range

18 18.1, 18.2

reaction region

18.1-18.n

subzones

19

isobaric Double belt press arrangement

20.1, 20.2

pressure element

21.1, 21.2

Inside of the press belt 13.1 . 13.2

22.1, 22.2

caul I

23

isochoric Double belt press arrangement

24.1, 24.2, 24.11, 24.12, 24.21, 24.22

pressing unit

25a, 25b, 25.1, 25.2, 25.11, 25.12, 25.21, 25.22

Facility for at least indirectly influencing the temperature of the surface of the semi-finished fabric

26

cool shoes

X, Y Z

coordinate system

F

Fibrous web

d

thickness the clothing

H

height of the press nip

p1, p2

surface pressure

p _res

resulting Surface pressure, differential pressure

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102008040053 [0004]
• WO 2005/098128 A1 [0005]

Cited non-patent literature

• - http://www.held-tech.de [0018]
• - DIN 4760 [0036]
• - http://www.schott-meissner.de [0056]

Claims (27)

Method for influencing the surface structure of a covering ( 1 ), in particular a press felt or drying belt for use in a machine for producing a fibrous web (F) in the form of a paper, board or tissue web, in which the outside (FIG. 3) provided for supporting the fibrous web (F) ( 2 ' ) of a semi-finished fabric ( 1' ) is smoothed and compacted by exerting a pressure of a smooth surface against it, characterized in that the semi-finished fabric ( 1' ) by at least one double belt press arrangement ( 8th . 8.1 . 8.2 ) with one of two press belts ( 13.1 . 13.2 ) and in the longitudinal and transverse direction of the double belt press arrangement ( 8th . 8.1 . 8.2 ) extending treatment area ( 10 . 10.1 . 10.2 ) described extended press nip ( 9 . 9.1 . 9.2 ) and within the treatment area ( 10 . 10.1 . 10.2 ) on both sides a surface pressure (p1, p2) on the smooth pressing belts ( 13.1 . 13.2 ) is exercised on this. Method according to claim 1, characterized in that the thickness (d) of the clothing ( 1 ) and / or the surface structure of at least the outside of the support for the fibrous web (F) ( 4 ) of the covering ( 1 ) as a function of at least the resulting surface pressure (p _res ) of the smooth pressing belts ( 13.1 . 13.2 ) on both sides of the semi-finished fabric ( 1' ) applied surface pressures (p1, p2) over the treatment area ( 10 . 10.1 . 10.2 ) is set, preferably controlled. Method according to one of claims 1 or 2, characterized in that the resulting surface pressure (p _res ) of the over the smooth press belts ( 13.1 . 13.2 ) on both sides of the semi-finished fabric ( 1' ) applied surface pressures (p1, p2) within the entire treatment area ( 10 . 10.1 . 10.2 ) in the direction of passage of the semi-finished fabric ( 1' ) is kept constant. Method according to one of claims 1 to 3, characterized in that the resulting surface pressure (p _res ) over the smooth press belts ( 13.1 . 13.2 ) on both sides of the semi-finished fabric ( 1' ) applied surface pressures (p1, p2) within the treatment area ( 10 . 10.1 . 10.2 ) by controlling at least the surface pressure (p1, p2) on the outside of the support provided for the fibrous web (F) ( 2 ' ) of the semi-finished fabric ( 1' ) is set. Method according to one of claims 1 to 3, characterized in that the surface pressure (p1) of the on the for supporting the fibrous web (F) provided outside ( 2 ' ) of the semi-finished fabric ( 1' ) acting press belt ( 13.1 ) higher than the surface pressure of the inside of the semi-finished fabric ( 1' ) acting press belt ( 13.2 ) is set. Method according to claim 1, characterized in that the height (h) of the press nip ( 9 . 9.1 . 9.2 ) descriptive distance of the two press belts ( 13.1 . 13.2 ) over the extent of the treatment area ( 10 . 10.1 . 10.2 ) is kept constant. A method according to claim 6, characterized in that the surface pressure (p1, p2, p _res ) over the extension of the treatment area ( 10 . 10.1 . 10.2 ) depending on the surface topography of the semi-finished fabric ( 1' ) is set variably. Method according to one of claims 1 to 7, characterized in that the thickness (d) of the covering ( 1 ) and / or the surface structure of at least the outside of the support for the fibrous web (F) ( 2 ) of the covering ( 1 ) depending on the semi-finished fabric ( 1' ) acting temperature and / or temperature distribution over the extension of the treatment area ( 10 . 10.1 . 10.2 ) is controlled. Method according to one of claims 1 to 8, characterized in that the thickness (d) of the covering ( 1 ) and / or the surface structure of at least the outside of the support for the fibrous web (F) ( 2 ) of the covering ( 1 ) depending on the semi-finished fabric ( 1' ) acting temperature outside the treatment area ( 10 . 10.1 . 10.2 ) is controlled. A method according to claim 9, characterized in that the semi-finished fabric ( 1' ) before the inlet ( 15 ) in the double belt press assembly ( 8th . 8.1 . 8.2 ) is heated. A method according to claim 9 or 10, characterized in that the semi-finished fabric ( 1' ) after the discharge ( 16 ) from the double belt press assembly ( 8th . 8.1 . 8.2 ) is cooled. Method according to one of claims 8 to 11, characterized in that the temperature in the guide direction of the semi-finished fabric ( 1' ) and / or is set zone by zone across this. Method according to one of claims 8 to 12, characterized in that on the semi-finished fabric ( 1' ) is selected such that a melting of the surface ( 2 ' ) of the semi-finished fabric ( 1' ) is achieved. Method according to one of claims 1 to 13, characterized in that the semi-finished fabric ( 1' ) in succession via at least two double belt press assemblies ( 8.1 . 8.2 ) to be led. A method according to claim 14, characterized in that the semi-finished fabric ( 1' ) in a first arranged in the direction of passage double belt press assembly ( 8.1 ) heated under defined pressure and in the downstream double belt press arrangement ( 8.2 ) is cooled under defined pressure. Method according to one of claims 1 to 15, characterized in that before the inlet ( 15 ) in the double belt press assembly ( 8th . 8.1 . 8.2 ) a coating with predefined properties on the surface ( 2 ' ) of the semi-finished fabric ( 1' ) is applied. Contraption ( 5 ) for producing a covering ( 1 ), in particular a press felt or drying belt for use in a machine for producing a fibrous web (F) in the form of a paper, board or tissue web, comprising a device ( 6 ) for the formation of the surface ( 4 ) of the covering ( 1 ); characterized in that the device ( 6 ) for the formation of the surface ( 4 ) of the covering ( 1 ) at least one double belt press arrangement ( 8th . 8.1 . 8.2 ) with two each a press belt ( 13.1 . 13.2 ) having pressing elements ( 12.1 . 12.2 ), which in the direction of passage of the semi-finished fabric ( 1' ) a treatment area ( 10 . 10.1 . 10.2 ) described extended press nip ( 9 . 9.1 . 9.2 ) train. Contraption ( 5 ) according to claim 17, characterized in that the at least one double belt press arrangement ( 8th . 8.1 . 8.2 ) as an isobaric double belt press arrangement ( 19 ), each comprising at least one on the inside ( 21.1 . 21.2 ) of the single press belt ( 13.1 . 13.2 ) acting pressing unit ( 24.1 . 24.2 . 24.11 . 24.12 . 24.21 . 24.22 ). Contraption ( 5 ) according to claim 17, characterized in that the at least one double belt press arrangement ( 8th . 8.1 . 8.2 ) as an isochore double belt press arrangement ( 23 ), in particular comprising in each case one the inside ( 21.1 . 21.2 ) of the single press belt ( 13.1 . 13.2 ) supporting roll carpet. Contraption ( 5 ) according to any one of claims 17 to 19, characterized in that at least that on the for supporting a fibrous web (F) provided surface ( 4 ' ) of the semi-finished fabric ( 1' ) acting press belt ( 13.1 ) is characterized by a surface having at least one of the following properties: thickness variation <10 μm surface roughness Ra in the range from 0.05 μm to 0.5 μm, preferably 0.10 μm tensile strength in the range between 1400 MPa to 1800 MPa Tensile strength at maximum temperature in the range of 1200 MPa to 1300 MPa - Vickers hardness HV10 between 450 and 500. Device according to one of claims 17 to 19, characterized in that at least one device ( 25.1 . 25.2 . 25.11 . 25.12 . 25.21 . 25.22 ) for at least indirectly influencing the temperature of the surface ( 4 ' ) of the semi-finished fabric ( 1' ) is provided. Contraption ( 5 ) according to claim 21, characterized in that the at least one device ( 25.1 . 25.2 . 25.11 . 25.12 . 25.21 . 25.22 ) for at least indirectly influencing the temperature of the surface ( 4 ' ) of the semi-finished fabric ( 1' ) in the institution ( 6 ) for the formation of the surface ( 4 ) of the covering ( 1 ), in particular the double belt press arrangement ( 8th . 8.1 . 8.2 ) is integrated. Contraption ( 5 ) according to claim 21 or 22, characterized in that the at least one device ( 25.1 . 25.2 . 25.11 . 25.12 . 25.21 . 25.22 ) for at least indirectly influencing the temperature of the surface ( 4 ' ) of the semi-finished fabric ( 1' ) of the institution ( 6 ) for the formation of the surface ( 4 ) of the covering ( 1 ) is subordinate. Contraption ( 5 ) according to one of claims 21 to 23, characterized in that the at least one device ( 25.1 . 25.2 . 25.11 . 25.12 . 25.21 . 25.22 ) for at least indirectly influencing the temperature of the surface ( 4 ' ) of the semi-finished fabric ( 1' ) of the institution ( 6 ) for the formation of the surface ( 4 ) of the covering ( 1 ) is arranged upstream. Contraption ( 5 ) according to one of claims 22 to 24, characterized in that the at least one device ( 25.1 . 25.2 . 25.11 . 25.12 . 25.21 . 25.22 ) for at least indirectly influencing the temperature of the surface ( 4 ' ) of the semi-finished fabric ( 1' ) only one side of the semi-finished fabric ( 1' ) assigned. Covering ( 1 ), in particular a press felt or drying belt for use in a machine for the production of fibrous web (F) in the form of a paper, board or tissue web with an outer side (US) for supporting a fibrous web (F) ( 2 ), characterized in that for supporting a fibrous web (F) before seen surface ( 4 ) on the outside ( 2 ) of the covering ( 1 ) is characterized by a surface coefficient Sa value of 1.4 to 10, preferably 2.0 to 5. Covering ( 1 ), in particular a press felt or a drying belt for use in a machine for producing a fibrous web (F) in the form of a paper, board or tissue web with an outer side (FIG. 3) for supporting a fibrous web (F). 2 ), prepared by a process according to claims 1 to 26.