EP1647629A1 - Roll for manufacturing and/or treating a fibrous web, method for manufacturing the roll and use of the roll - Google Patents

Abstract

The roller (1) in a machine for the production and/or finishing of a paper or cardboard web, and especially the web-forming or fourdrinier suction roller for the pulp, has a roller mantle (2) with a number of water extraction openings (3). The openings are arranged in groups (G1-G3). Carrier bodies (5) are between the openings, for support against the fourdrinier, with a contact surface (6) and carrier flanks (7) aligned to the roller axis. An edge (K) is formed between the carrier surfaces and their flanks. The contact surfaces are coated to give them an increased hardness compared to the remainder of the roller material, to give an increased wear resistance. The coating is a ceramic, hard metal or hard metal alloy material.

Description

The invention relates to a roller, in particular forming roller or Siebsaugwalze, for the production and / or treatment of a fibrous web, in particular paper or board web whose roll shell is provided with a plurality of drainage openings, wherein the drainage openings are associated with at least a first group or a second group and wherein between the drainage openings a plurality of a sieve at least temporarily carrying support bodies is formed, each having a sieve contacting the support surface and each one surrounding the support surface and executed to the roll axis support flank, wherein between the respective support surface and the associated support flank an edge is formed.

Furthermore, the invention relates both to a process for producing the roll according to the invention and to an application of the roll according to the invention.

To equalize the outflow of water from the fibrous web into the forming roller of a respective former, in particular twin-wire former, a shrink-screen cover on the forming roller has hitherto been necessary to avoid hole shadow markings in the fibrous web. However, such a connection brings with it a number of disadvantages. These disadvantages include, for example, the frequent roll changes required as a result of shrink screen wear (typically every three at nine months), unplanned shutdowns Shrinkage screen damage and restrictions on the use of certain cleaning agents. For example, alkalis damage the polyester material of the shrink-wrap cover. Moreover, in most cases a high pressure spray tube is needed. Since the roller is provided with a stocking, the use of a scraper is not possible.

A forming roller without Schrumpfsiebbezug would thus mean a higher runnability of the machine for the production and / or treatment of a fibrous web.

Various solutions to this problem have already been proposed. All of these already proposed solutions, as set forth, for example, in PCT Publication WO 99/32713 A1 and German Laid-Open Application DE 100 26 542 A1, are based on a roll on which a regular basic drilling pattern is applied. This basic drilling pattern, also referred to as a first group or primary pattern, usually consists of holes drilled through the roll shell, which are countersunk on the outside of the roll.

It has also been proposed to additionally apply a specific surface pattern to the entire roll surface. This second surface pattern, also referred to as second group or secondary pattern, is described, for example, in German Offenlegungsschriften DE 102 27 842 A1, DE 102 27 846 A1, DE 102 27 825 A1, DE 102 27 847 A1, DE 102 27 848 A1, DE 102 27 843 A1 and in the unpublished German patent applications DE 103 27 244.5 and DE 103 27 246.1 of the applicant.

The use of a roller with a primary and secondary pattern has a very positive effect on the uniformity of the dewatering of the fibrous web as well as the avoidance of hole shadow marks.

The serious disadvantage of using such a roller, however, is that increased wear on both the roller and the screen due A reduction of the wings appears in appearance. This wear is reinforced in particular by sharp edges on the circumference of the wings or by raised nubs in the wings. Although attempts have been made to eliminate existing burrs and the like by conventional brushing, the problem of increased screen wear could not be satisfactorily resolved.
The invention has for its object to provide an improved roller of the type mentioned above, which provides a significant reduction in self-wear and the wear of at least temporarily guided over their contact surfaces sieve. Furthermore, a method for producing such a roller should be specified.

This object is achieved in that at least the wings are coated with at least one higher wear resistance than the material of the roll shell material having such that the individual support body has a respective touching the screen touching surface.

By means of this coating according to the invention, on the one hand, a contact surface which at least temporarily contacts the wire is created, which has a high wear resistance and thus a long service life while avoiding any self-wear on the roller, and, on the other hand, possibly existing sharp edges on the circumference of the support surfaces and / or raised nubs in the area of the wings covered, leveled and thus rendered harmless.

In an expedient practical embodiment, the respective contact surface is smaller, equal to or larger than the associated wing. Thus, it is possible to exert influence on the contact portion of the screen on the roll shell and thus on the dewatering properties of the roll.

So that wear or even damage to the screen is avoided as far as possible, is between the respective contact surface and the associated Supporting surface provided in each case a transition surface which merges by means of a radius-shaped contour in the contact surface.

In a further expedient practical embodiment, a plurality of, preferably all supporting flanks are coated at least in the entire area with at least one material having a higher wear resistance than the material of the roll mantle, at least in such a way that the individual supporting body has a hood-like coating. The supporting body thus receives on the predominant part of its outer surface a low-wear coating, which increases the overall lifetime or life of the support body and thus the roller noticeably.

In this case, in turn, wear or even damage to the screen can be avoided to the greatest extent possible if, in each case, a transitional surface is provided between the respective contact surface and the associated coating surface of the support flank, which merges into the contact surface by means of a radius-shaped contour.

The coating of the wings preferably has a coating height which is chosen such that the radius-shaped contour of the transitional surface has a radius ≥ 0.1 mm, preferably ≥ 0.2 mm, in particular ≥ 0.3 mm. This ensures that, depending on the coating process and material, the required radii result.

Furthermore, the coating material of the support body comprises at least one ceramic material, a hard metal or a Harkmetalllegierung. However, this material specification has only exemplary character. Of course, other materials that meet the requirements imposed on the roller at least find their use.

The coating of the roller according to the invention is particularly advantageous if drainage openings are assigned to a first group and further drainage openings are assigned to a second group. The drainage openings of the first group are each further surrounded by a circular groove of a third group, wherein the circular grooves of the third group are preferably arranged concentrically to the circular groove surrounded by the drainage opening of the first group, or if the drainage openings of the at least two groups, at least in their respective orientation relative to the roll radius, with regard to their relative arrangement on the roll shell and / or with regard to their respective configuration, in particular their cross-section or cross-sectional shape, in particular in the area of the roll shell over the roll shell, produce an irregular surface structure. Experiments carried out have shown that such coated rolls provide a significant reduction of the respective self-wear as well as the respective wear of the at least temporarily guided over their contact surfaces sieves.

The process according to the invention for producing a roll, in particular a forming roll or a suction roll, for producing and / or treating a fibrous web, in particular a paper or board web, provides that the support bodies and supporting surfaces in the roll shell by means of drilling, milling, planing, pushing, sinking, Laser cutting or the like processing methods are manufactured and that at least partially, preferably completely coated with at least one of the material having a higher wear resistance than the material of the roll shell material coated such that the individual support body has a respective contacting surface of the screen.

In this case, preferably several, preferably all support flanks are at least coated in the respective edge, preferably coated in the entire area with at least one higher wear resistance than the material of the roll shell material such that the individual support body has a hood-like coating.

The wings and / or the support flanks of the support body can be coated with the material, for example by means of a thermal flame spraying process. Of course, other coating methods can find their use, wherein the coating method used is largely determined by the coating material used.

An advantageous embodiment of the manufacturing process of the roller is when the roll shell after the production of the support body and the wings is aftertreated, in particular by breaking and / or deburring sharp edges and / or brushing and / or sandblast of the roll shell. As a result, an optimal preparation due to the removal of sharp edges, burrs and the like for the subsequent coating of the support body of the roller is created.

In order to achieve better adhesion of the subsequently applied coating, it is advantageous if the roll shell is after-treated by brushing, in particular by brushing with nylon brushes containing abrasive, after the production of the support bodies and the wings, wherein in the region of the edge a radius ≥ 0, 05 mm is produced.

The roll shell is after the coating of the support body by grinding, in particular by grinding with a loose tape, reworked. As a result, an optimum surface quality of the coated roller can be achieved.

The roll according to the invention is outstandingly suitable for use in a twin-wire former of a machine for producing and / or treating a fibrous web, in particular a paper or board web. The roll according to the invention can be designed as a forming roll or wire suction roll.

The twin-wire former may, for example, have an at least one substantially vertical twin-wire section, in the starting region of which a roll according to the invention is arranged in the form of a forming roll and / or in the deflection region and / or end region of a roll according to the invention in the form of a wire suction roll.

Further features and advantages of the invention will become apparent from the following description of preferred embodiments with reference to the drawings.

Figur 1:

ein beispielhaftes Muster einer Oberflächenstruktur eines Walzenmantels einer Walze mit kritischen Kanten,

Figur 2:

eine räumliche Darstellung der Oberflächenstruktur des Musters gemäß Figur 1;

Figur 3a:

eine Schnittdarstellung eines Tragkörpers einer Walze gemäß dem Stand der Technik;

Figur 3b:

eine vergrößerte Schnittdarstellung des Tragkörpers der Figur 3a;

Figuren 4a bis 4d:

mehrere Schnittdarstellungen eines Tragkörpers einer erfindungsgemäßen Walze; und

Figur 5:

eine beispielhafte Anwendung der erfindungsgemäßen Walze in einem Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn.

Show it

FIG. 1:

an exemplary pattern of a surface structure of a roll shell of a roll with critical edges,

FIG. 2:

a spatial representation of the surface structure of the pattern of Figure 1;

FIG. 3a:

a sectional view of a supporting body of a roller according to the prior art;

FIG. 3b:

an enlarged sectional view of the support body of Figure 3a;

FIGS. 4a to 4d:

a plurality of sectional views of a support body of a roll according to the invention; and

FIG. 5:

an exemplary application of the roll according to the invention in a twin-wire former of a machine for producing a fibrous web.

FIG. 1 shows an exemplary pattern M of a surface structure S of a roll shell 2 of a roll 1 with critical edges K., which is only partially shown.

The illustrated roll 1 is, for example, a forming roll or wire suction roll of a machine for producing a fibrous web and used for the production and / or treatment of the fibrous web, such as a paper or board web.

The roll shell 2 of the roll 1 is provided with a plurality of drainage holes 3, which are partially associated with a first group G ₁ (kline openings) and a second group G ₂ (large openings). The drainage openings 3 of the two groups G ₁ , G ₂ have different shapes and sizes. The drainage openings 3 of the first group G ₁ are each surrounded by a circular groove 4 of a third group G ₃ . In this case, each circular groove 4 of the third group G _{3 is arranged} concentrically to the drainage opening 3 of the first group G ₁ surrounded by the circular groove 4. Between the drainage openings 3 thus a plurality of non-illustrated sieve at least temporarily supporting bodies 5 are formed, each having a sieve touching the support surface 6 and each one surrounding the support surface 6 and executed to the roll axis support flange 7, wherein between the respective support surface 5 and the associated supporting flank 7 an edge K is formed (see Figures 2 and 3a).

The pattern M shown in FIG. 1 is at least partially indicated, for example, in European patent application EP 1 375 743 A1. The pattern M has no feature essential to the invention, but rather has an exemplary character and can take up any desired surface structure.

• die Entwässerungsöffnungen der wenigstens zwei Gruppen erzeugen zumindest hinsichtlich ihrer jeweiligen Ausrichtung relativ zum Walzenradius, hinsichtlich ihrer relativen Anordnung auf dem Walzenmantel und/oder hinsichtlich ihrer jeweiligen Ausgestaltung wie insbesondere ihres Querschnitts bzw. ihrer Querschnittsform insbesondere im Bereich des Walzenmantels über den Walzenmantel betrachtet eine unregelmäßige Oberflächenstruktur;
• mindestens ein Teil der Entwässerungsöffnungen ist so angeordnet, dass sich ihre Durchmesser an der Außenseite des Walzenmantels überlappen;
• zumindest einige der Entwässerungsöffnungen sind zu mehreren Vertiefungen erweitert, die sich an der Oberfläche der Hülse ausgehend von den jeweiligen Entwässerungsöffnungen nach außen erstrecken;
• ein Teil der Entwässerungsöffnungen sind zumindest im oberflächennahen Bereich der Hülse gegenüber den anderen Entwässerungsöffnungen im Durchmesser vergrößert;
• die Oberfläche des Walzenmantels ist mit Vertiefungsrillen versehen, wobei die Vertiefungsrillen in Axialrichtung des Walzenmantels oder in einem spitzen Winkel hierzu verlaufen und wobei alle Vertiefungsrillen entlang der Oberfläche des Walzenmantels dergestalt parallel zueinander verlaufen, dass jede Entwässerungsöffnung mit wenigstens einer benachbarten Enfiwässerungsöffnung über einen Verbindungskanal verbunden ist;
• die Oberfläche des Walzenmantels ist mit Verfiiefungsrilfen versehen, wobei die Vertiefungsrillen in Umfangsrichtung des Walzenmantels oder in einem spitzen Winkel hierzu verlaufen und wobei alle Vertiefungsrillen entlang der Oberfläche des Walzenmantels dergestalt parallel zueinander verlaufen, dass jede Entwässerungsöffnung mit wenigstens einer benachbarten Entwässerungsöffnung über einen Verbindungskanal verbunden ist;
• die Oberfläche des Walzenmantels ist mit Vertiefungsrillen versehen, wobei die Vertiefungsrillen in Umfangsrichtung und/oder in Axialrichtung des Walzenmantels oder in einem beliebigen Winkel hierzu verlaufen und wobei alle Vertiefungsrillen entlang der Oberfläche des Walzenmantels dergestalt parallel zueinander verlaufen, dass jede Entwässerungsöffnung mit wenigstens einer benachbarten Entwässerungsöffnung über einen Verbindungskanal verbunden ist;
• zwischen den Entwässerungsöffnungen sind zusätzliche Entwässerungsöffnungen verringerten Durchmessers vorgesehen, welche die zwischen den Entwässerungsöffnungen vorhandenen Stege unterbrechen;
• die Entwässerungsöffnungen sind derart angeordnet, dass zumindest hinsichtlich ihrer jeweiligen Ausrichtung relativ zum Radius des Walzenmantels, hinsichtlich ihrer relativen Anordnung auf der Oberfläche des Walzenmantels und/oder hinsichtlich ihrer jeweiligen Ausgestaltung wie insbesondere ihres Querschnitts beziehungsweise ihrer Querschnittsform insbesondere im Bereich der Oberfläche des Walzenmantels über die Oberfläche des Walzenmantels betrachtet eine unregelmäßige Oberflächenstruktur erzeugen; und/oder
• die in die Oberfläche des Walzenmantels eingebrachten Entwässerungsöffnungen sind zumindest bereichsweise entsprechend einem bestimmten Grundmuster angeordnet und zusätzliche Oberflächenmuster sind in die Oberfläche des Walzenmantels eingebracht, die über die Oberfläche des Walzenmantels betrachtet eine unregelmäßige Oberflächenstruktur bilden.

For example, the pattern M can be implemented as follows:

• the drainage openings of the at least two groups generate an irregular surface structure, at least with regard to their respective orientation relative to the roll radius, with regard to their relative arrangement on the roll shell and / or with regard to their respective configuration, in particular their cross section or cross sectional shape, in particular in the region of the roll shell over the roll shell ;
• at least a part of the drainage openings is arranged so that their diameters overlap on the outside of the roll mantle;
• at least some of the drainage openings are widened into a plurality of recesses which extend outward from the respective drainage openings on the surface of the sleeve;
• a portion of the drainage holes are enlarged in diameter, at least in the near-surface region of the sleeve relative to the other drainage holes;
• the surface of the roll mantle is provided with recessed grooves, the recessed grooves extending in the axial direction of the roll mantle or at an acute angle thereto and wherein all the recession grooves run parallel to each other along the surface of the roll mantle such that each drainage opening is connected to at least one adjacent drainage opening via a connecting channel ;
• the surface of the roll mantle is provided with caulking aids, wherein the groove grooves extend in the circumferential direction of the roll mantle or at an acute angle thereto and wherein all the groove grooves are parallel to each other along the surface of the roll mantle such that each drainage aperture is connected to at least one adjacent drainage aperture via a connection channel ;
• the surface of the roll mantle is provided with recessed grooves, wherein the recessed grooves extend in the circumferential direction and / or in the axial direction of the roll mantle or at any angle thereto and wherein all the recession grooves run parallel to each other along the surface of the roll mantle such that each drainage opening has at least one adjacent drainage opening connected via a connection channel;
• between the drainage openings additional drainage openings of reduced diameter are provided which interrupt the existing between the drainage holes webs;
• the drainage openings are arranged such that, at least with respect to their respective orientation relative to the radius of the roll shell, with regard to their relative arrangement on the surface of the roll shell and / or with respect to their respective configuration as in particular of its cross-section or its cross-sectional shape, in particular in the area of the surface of the roll mantle over the surface of the roll mantle, produce an irregular surface structure; and or
• the dewatering openings introduced into the surface of the roll mantle are arranged at least in regions corresponding to a specific basic pattern and additional surface patterns are introduced into the surface of the roll mantle, which form an irregular surface structure viewed over the surface of the roll mantle.

Such patterns M are known for example from the cited documents and the not previously published German patent applications of the applicant. Its subject matter with regard to possible and varied embodiments of the pattern M is hereby made the subject of the present description.

Moreover, the pattern M can be local, sectional, multi-sectional or holistic, regular and / or irregular.

FIG. 2 now shows a spatial representation of the surface structure S of the pattern M according to FIG. 1.

There are clearly arranged between the drainage holes 3 and a non-illustrated screen at least temporarily supporting support body 5 can be seen, which are sometimes surrounded by a respective circular groove 4. The supporting body 5 has a supporting surface 6 not touching the sieve, and a supporting flank 7 surrounding the supporting surface 6 and directed towards the roll axis, wherein a sharp-edged and circumferential edge K is formed between the respective supporting surface 6 and the associated supporting flank 7 (see FIG ). This sharp edge 7 causes the already described increased wear on the screen, not shown.

FIG. 3a shows a sectional illustration of a supporting body 5 of a roller 1 according to the prior art, which is shown only in sections. The complete illustrated support body 5 forms with further merely indicated support bodies 5 each a single support surface 6 for the sieve, not shown. The support body 5, as already stated in the description of Figure 2, in addition to the support surface 6 surrounding the support surface 6 and executed to the roll axis and circumferential support flank 7, wherein between the respective support surface 6 and the associated supporting flank 7 a sharp and circumferential edge K is formed. This sharp edge K causes the already described increased wear on the screen, not shown.

FIG. 3b now shows an enlarged sectional view of the support body 5 of FIG. 3a, which has a support surface 6 and a support flank 7 surrounding the support surface 6. In this case, a sharp-edged and circumferential edge K is formed between the support surface 6 and the associated supporting flank 7.

FIGS. 4a to 4d now show several sectional views of a supporting body 5 of a roller 1 according to the invention.

It is provided according to the embodiment of Figure 4a, that at least the wings 6 are coated with at least one higher wear resistance than the material of the roll shell 2 having material such when generating a coating B with a respective coating surface 9 that the individual support body 5 a respective having not touching sieve touching surface 8. The respective contact surface 8 may be smaller (FIG. 4a), equal (FIG. 4b) or larger (FIG. 4c) than the associated support surface 6.

In the embodiment of FIG. 4 c, the respective contact surface 8 is larger than the associated support surface 6. Thus, a protrusion Ü of the contact surface 8 of the coating B with respect to the support surface 6 arises.

Between the respective contact surface 8 and the associated support surface 6, a transition surface 10 is provided in each case, which merges into the contact surface 8 by means of a radius-shaped contour T. The transition between the two surfaces 8, 10 is preferably carried out continuously and steadily. If the surface of the supporting flank has a non-continuous course, that is to say cut edges, in particular a corner on the top or the same, the transition between the two surfaces 8, 10 preferably also takes place continuously and steadily in this area.

FIG. 4d shows an embodiment of a carrier body 5, whose carrying flanks 7 are coated at least in the entire region with at least one material having a higher wear resistance than the material of the roll mantle 2, such that the individual carrier body 5 is a hood-like material Coating B having a coating surface 9. The support body 5 thus has a respective contact surface 8 contacting the screen, not shown. In the embodiment of FIG. 3e, for example, approximately one third of the area of the supporting flank 7 is coated. In this case, several, preferably all supporting body 5 may be coated in such a way. The produced support body 5 has in its uncoated form a radius R * ≥ 0.05 mm.

Between the respective contact surface 8 and the associated coating surface 9 of the support flank 7, a transition surface 10 is provided, which merges into the contact surface 8 by means of a radius-shaped contour T.

All four embodiments of FIGS. 4a to 4d have in common that the coating B of the support surfaces 6 has a coating height H which is chosen such that the radius-shaped contour T of the transition surface 10 has a radius R ≥ 0.1 mm, preferably ≥ 0.2 mm, in particular ≥ 0.3 mm. The coating material of the support body 5 comprises at least one ceramic material, a hard metal or a hard metal alloy.

• Herstellung der Tragkörper 5 und der Tragflächen 6 im Walzenmantel 2 mittels Bohren, Fräsen, Hobeln, Stoßen, Senken, Laserschneiden oder dergleichen Bearbeitungsverfahren und
• Beschichtung wenigstens der hergestellten Tragflächen 2 zumindest teilweise, vorzugsweise vollständig mit mindestens einem eine höhere Verschleißfestigkeit als das Material des Walzenmantels 2 aufweisenden Material, wobei der einzelne Tragkörper 5 eine jeweilige das Sieb berührende Berührungsfläche 8 aufweist.

The roll 1 according to the invention is preferably produced in the following process steps:

• Production of the support body 5 and the wings 6 in the roll shell 2 by means of drilling, milling, planing, bumping, sinking, laser cutting or the like processing method and
• Coating at least partially of the produced airfoils 2 at least partially, preferably completely with at least one material having a higher wear resistance than the material of the roll mantle 2, wherein the individual support body 5 has a respective contact surface 8 touching the wire.

Furthermore, a plurality of, preferably all support flanks 7, at least in the edge K executed, preferably in the entire area with at least one higher wear resistance than the material of the roll shell 2 having material coated so that the individual support body 5 has a hood-like coating B.

The wings 6 and / or the support flanks 7 of the support body 5 are preferably coated by means of a thermal flame spraying process with the material.

In addition, the roll shell 2 can be post-treated after the production of the support body 5 and the wings 6, in particular by breaking and / or deburring sharp edges and / or brushing and / or sandblasting the roll shell. In this case, the roll shell 2 after the production of the support body 5 and the wings 6 by brushing, in particular by brushing with abrasive nylon brushes, be post-treated, wherein in the region of the edge K, a radius R * ≥ 0.05 mm is produced.

Furthermore, the roll shell 2 after the coating of the support body 5 preferably by a grinding, in particular by grinding with a loose tape, reworked.

FIG. 5 shows an exemplary application of the roll 1 according to the invention in a twin-wire former 11 of a machine for producing a fibrous web.

Such a Doppeisiebformer 11 is known for example from German Patent Application DE 101 06 731 A1. It has at least one essentially vertical double-wire section D, in the initial region B _{A of which} a forming roller 12 and / or in its deflection region B _U and / or end region B _E a suction sieve 13 is arranged. At least one of the two rollers 12, 13 is designed as a roller 1 according to the invention.

The twin-wire section D of the Doppeisiebformers 11 can of course also at an angle to the horizontal obliquely up or down or they can also extend horizontally or approximately horizontally. Thus, FIG. 5 represents only an exemplary course of the twin-wire section D.

In summary, it should be noted that the invention provides an improved roller, in particular forming roller or Siebsaugwalze, of the type mentioned, which provides a significant reduction of self-wear and the wear of at least temporarily guided over their contact surfaces sieve.

LIST OF REFERENCE NUMBERS

1

roller

2

roll shell

3

drain hole

4

district Rifle

5

supporting body

6

wing

7

supporting edge

8th

Touchpad

9

coating area

10

Transition surface

11

twin

12

forming roll

13

Suction roll

B

coating

B _A

initial region

B _E

end

B _U

deflection

D

twin-wire

G ₁

First group

G ₂

Second group

H

coating height

K

edge

M

template

R *

Radius (supporting body)

R

Radius (transition area)

S

surface structure

T

contour

Ü

Got over

Claims (18)

Roller (1), in particular forming roller (12) or suction sieve roller (13), for producing and / or treating a fibrous web, in particular paper or board web, the roll shell (2) is provided with a plurality of drainage openings (3), wherein the drainage openings (3) at least one first group (G ₁ ) or a second group (G ₂ ) are assigned and wherein between the drainage openings (3) a plurality of a sieve at least temporarily carrying support bodies (5) is formed, each one touching the screen Supporting surface (6) and in each case one of the support surface (6) surrounding and executed to the roll axis carrying flank (7), wherein between the respective support surface (6) and the associated supporting flank (7) an edge (K) is formed,
characterized,
in that at least the support surfaces (6) are coated with at least one material having a higher wear resistance than the material of the roll mantle (2) such that the individual support body (5) has a respective contact surface (8) contacting the screen. Roller (1) according to claim 1,
characterized,
that the respective contact surface (8) is equal to or greater than the associated support surface (6) is smaller. Roller (1) according to claim 2,
characterized,
in that a respective transitional surface (10) is provided between the respective contact surface (8) and the associated support surface (6) which merges into the contact surface (8) by means of a radius-shaped contour (T). Roller (1) according to claim 1 or 2,
characterized,
in that several, preferably all supporting flanks (7) are coated in such a way, at least in the entire area with at least one material having a higher wear resistance than the material of the roll mantle (2), that the individual supporting body (5) has a hood-like coating (B) and
that the edge (K) has a radius R * ≥ 0.05 mm. Roller (1) according to claim 4,
characterized,
in that a respective transitional surface (10) is provided between the respective contact surface (8) and the associated coating surface (9) of the support flank (7), which merges into the contact surface (8) by means of a radius-shaped contour (T). Roller (1) according to claim 3 or 5,
characterized,
includes that the coating (B) of the wing (6) a coat height (H) which is chosen such that the radius-shaped contour (T) of the transition surface (10) mm a radius (R) ≥ 0.1, preferably ≥ 0, 2 mm, in particular ≥ 0.3 mm. Roller (1) according to one of the preceding claims,
characterized,
that the coating material the supporting body (5) comprises at least one ceramic material, a hard metal or a Hartmetalliegierung. Roller (1) according to one of the preceding claims,
characterized,
that drainage openings (3) are assigned to a first group (G ₁ ), that further drainage openings (3) are assigned to a second group (G ₂ ), and
that the drainage openings (3) of the first group (G ₁₎ a third group (G ₃₎ are each surrounded by a circular groove (4). Roller (1) according to claim 8,
characterized,
that the circular groove (4) ₍₃ g) to the region surrounded by the circular groove (4) drainage opening (3) of the first group (G ₁₎ is arranged concentrically with the third group. Roller (1) according to one of the preceding claims,
characterized,
that the drainage openings (3) of the at least two groups (G ₁ , G ₂ ) at least with respect to their respective orientation relative to the roll radius, with respect to their relative arrangement on the roll shell (2) and / or with regard to their respective configuration, in particular their cross section or their Cross-sectional shape, in particular in the region of the roll shell (2) over the roll shell (2) considered an irregular surface structure (S) produce. Process for producing a roll (1), in particular forming roll (12) or wire suction roll (13), for the production and / or treatment of a fibrous web, in particular paper or board web, according to claim 1,
characterized,
that the support body (5) and the support surfaces (6) in the roll shell (2) by means of drilling, milling, planing, bumping, sinking, laser cutting or the like processing methods are prepared and
in that at least the produced bearing surfaces (6) are coated at least partially, preferably completely, with at least one material having a higher wear resistance than the material of the roll mantle (2) such that the individual support body (5) has a respective contact surface (8) contacting the screen , Method according to claim 11,
characterized,
in that a plurality of, preferably all supporting flanks (7) are coated at least in the entire area with at least one material having a higher wear resistance than the material of the roll mantle (2), so that the individual supporting body (5) a hood-like coating (B). Method according to claim 11 or 12,
characterized,
that the wings (6) and / or the support flanks (7) to be coated of the support body (5) by means of a thermal flame spraying process with the material. Method according to one of claims 11 to 13,
characterized,
that the roll shell (2) after the production of the support body (5) and the support surfaces (6) is aftertreated, in particular by breaking and / or deburring sharp edges (K) and / or brushing and / or sandblasting of the roll shell (2). Method according to claim 14,
characterized,
that the roll shell (2) after the production of the support body (5) and the support surfaces (6) by a brush, in particular by brushing with abrasive nylon brushes, aftertreated, wherein in the region of the edge (K) has a radius (R *) ≥ 0, 05 mm is produced. Method according to one of claims 11 to 15,
characterized,
that the roll shell (2) after the coating of the support body (5) by a grinding, in particular by a grinding with a loose band, is reworked. Twin-wire former (11) of a machine for producing and / or treating a fibrous web, in particular paper or board web, with a roll (1), in particular forming roll (12) or wire suction roll (13), according to one of claims 1 to 10. Twin-wire former (11) according to claim 17,
characterized,
in that it has an at least one essentially vertical twin-wire section (D), in whose initial region (B _A ) a forming roller (12) according to one of claims 1 to 10 and / or in its deflection region (B _U ) and / or end region (B _E ) a Siebsaugwalze (13) is arranged according to one of claims 1 to 10.

Images