EP1860233B1 - Partie tamis d'une machine de fabrication et/ou de traitement d'une bande de matière fibreuse - Google Patents

Partie tamis d'une machine de fabrication et/ou de traitement d'une bande de matière fibreuse Download PDF

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Publication number
EP1860233B1
EP1860233B1 EP20070103562 EP07103562A EP1860233B1 EP 1860233 B1 EP1860233 B1 EP 1860233B1 EP 20070103562 EP20070103562 EP 20070103562 EP 07103562 A EP07103562 A EP 07103562A EP 1860233 B1 EP1860233 B1 EP 1860233B1
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Prior art keywords
roll
roll shell
wire
wire section
strips
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EP20070103562
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German (de)
English (en)
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EP1860233A1 (fr
Inventor
Thomas RÜHL
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Voith Patent GmbH
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Voith Patent GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/10—Suction rolls, e.g. couch rolls
    • D21F3/105—Covers thereof

Definitions

  • the invention relates to a wire section of a machine for producing and / or treating a fibrous web, in particular paper or board web comprising at least one roller, in particular Formierwalze or Siebsaugwalze, and at least one guided over a partial circumferential region of the roller, said roller having a roll shell Having a plurality of radial openings and wherein the roll shell is wrapped with a composite of upright in the radius direction of the roll shell of the roll upright bands support structure.
  • Such a wire section is for example from the German patent application DE 32 10 320 A1 known.
  • the support structure is formed of straight, at least approximately in the circumferential direction of the roll shell of the roller and upstanding in the radius direction of the roll shell of the roll standing first bands formed by in the circumferential direction of the roll shell of the roll corrugated and also in the radius direction of the roll shell of the roll upright second bands connected to each other.
  • a support structure in the form of a honeycomb structure with a plurality of honeycombs in this case, this honeycomb structure forms a honeycomb honeycomb cover in such a way that cable connections exist between the honeycombs belonging to a honeycomb group, the boundaries between adjacent honeycomb groups being free from such honeycomb connections. In this case, a significant reduction in the noise generated during operation of the wire section is achieved in a favorable manner.
  • the disclosed wire section has the serious disadvantage that it can not be operated for most types of graphic paper, since otherwise clear marks in the fibrous web are visible. Furthermore, it has a higher than average wear both on the honeycomb structure and on the guided sieve.
  • the roller was provided in the past with a Schrumpfsiebbezug.
  • the Schrumpfsiebbezug favoring the equalization of water outflow from the fibrous web in the roller of the wire section with additional avoidance of hole shadow marks in the fibrous web.
  • Such a roller for a wire section is, for example, in the German Offenlegungsschrift DE-OS 21 48 361 described.
  • a shrink screen cover on a roll also presents a number of disadvantages. These disadvantages include, for example, frequent roll changes required as a result of shrink screen wear (typically every three at nine months), unplanned shutdowns due to shrinkage screen damage, and restrictions on the use of certain detergents. 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.
  • rollers have been described, for example in the international application WO 99/32713 A1 or in the German Offenlegungsschrift DE 100 26 542 A1 on which a regular basic drill 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 are. If necessary, the primary pattern can also be overlaid by other patterns, such as a secondary pattern.
  • a roller which provides a plurality of drainage openings. Between these, a plurality of supporting bodies are arranged, which at least temporarily carry a wire and which each have a sieve contacting bearing surface, as well as a surrounding the support surface and executed to the roll axis carrying flank. At least the wings are coated.
  • the strips are provided with a thermal spray coating at least in their outermost radial region in which they at least intermittently contact the screen, the radii facing the screen 0.05 mm, preferably ⁇ 0.1 mm, in particular ⁇ 0.3 mm, and that the thermal spray coating has a coating thickness in the range of 0.5 to 2 mm, preferably from 0.75 to 1.5 mm.
  • the first object according to the invention is completely solved in this way.
  • the thermal spray coating has a coating thickness in the range of 0.5 to 2 mm, preferably 0.75 to 1.5 mm. This thickness range is cost-effective and reliable to produce and meets the requirements in practice more than necessary.
  • the roller at least in its outermost radial region with a thermal spray coating provides a significant reduction in wear on all the agents involved, such as the roller itself and the sieve passed over them.
  • the attachment of said radii on the sieve facing outermost radial region of the roller continues to affect the reduction of wear, since on the one hand, the possible wear surfaces are formed on the roller cheaper and on the other hand, the sieve no longer over sharp, the wear-promoting surfaces the roller is guided.
  • the invention has an extremely positive effect, especially at high wire tensions, for example ⁇ 5 kN / m, preferably ⁇ 6 kN / m, in particular ⁇ 8 kN / m, since here the contact pressure of the wire on the belts of the roller is particularly high, thus theoretically also the Siebverschl employ increases.
  • the inventive design of the wire section in particular the roller, creates the best conditions for the production of both non-sensitive paper types and sensitive paper types while avoiding markings in the fibrous web.
  • higher machine speeds can also be achieved and improved runnability is achieved, among other things due to fewer roll changes and reduced downtimes over time.
  • the roll shell of the roll is provided with straight, at least approximately in the circumferential direction of the roll shell of the roll extending and upright in the radius direction of the roll shell of the roll first bands, which is corrugated by in the circumferential direction of the roll shell of the roll and also in the radius direction of the roll shell of the roll upright second belts are connected to each other, or that the roll shell of the roll is provided with shaped, at least approximately in the circumferential direction of the roll shell of the roll extending and upstanding in the radius direction of the roll shell of the roll first bands.
  • the support structure thus consists of a honeycomb structure with a plurality of honeycombs.
  • the first embodiment is for example from the already mentioned German Offenlegungsschrift DE 32 10 320 A1 known, whereas the second Embodiment, for example, from the European patent application EP 0 462 434 A1 is known.
  • the thermal spray coating preferably consists of a coating material applied by thermal spraying, which comprises at least oxide-ceramic materials, carbide-based materials or self-fluxing alloys.
  • a coating hardness of the thermal spray coating in the range of 3,000 to 15,000 N / mm 2 , preferably from 5,000 to 10,000 N / mm 2 , can be produced.
  • the oxide-ceramic materials may preferably be Cr 2 O 3 , TiO 3 , Al 2 O 3 or mixtures thereof, the carbide-based materials WC / Co, WC / Co / Cr, or Cr 3 C 2 / NiCr and the self-fluxing alloys NiCrBSi. Their use excellently favors the generation of edge fillets with the above radii.
  • adjacent honeycombs are connected to one another by way of at least one opening, wherein the respective one Opening is arranged in the outermost radial region.
  • the opening is preferably open towards the outer radial area, whereby a recess is formed in the band.
  • This embodiment is particularly suitable for label-sensitive paper grades, since thus no regular marking structure in the fibrous web is visible.
  • the structure must be designed so that, despite broken strips still enough guide surface for the sieve is available, so that the sieve is still safely performed without excessive wear.
  • the individual honeycomb can be designed so that as possible no continuous guide surface between two adjacent honeycomb remains. It makes sense that the recesses are designed and arranged so that adjacent honeycombs have partially deviating arrangements and dimensions of these recesses. In particular, the visual impression of a regularity of the openings should be avoided.
  • adjacent second bands without adjacent recess have a spacing ⁇ 40 mm, preferably ⁇ 30 mm, in the circumferential direction of the roll mantle of the roll.
  • the arranged on the roll shell strips are preferably made of steel, preferably a stainless steel, made of aluminum, an alloy, in particular brass, or a plastic, in particular a CFK or GFRP. These materials provide the advantage of a substantial insensitivity to other, used in the wire section and accumulating materials with sufficient mechanical strength for the conventional operation of the wire section.
  • adjacent honeycomb in the circumferential direction of the roll shell of the roll are preferably offset from one another in the axial direction of the roll shell of the roll.
  • the second object is achieved according to the invention in that the strips mounted on the roll shell having a plurality of radial openings are provided with a thermal spray coating by thermal spraying at least in their outermost radial region in which they at least temporarily come into contact with the sieve.
  • the radii facing the sieve ⁇ 0.05 mm, preferably ⁇ 0.1 mm, in particular ⁇ 0.3 mm, and that the thermal spray coating has a coating thickness in the range of 0.5 to 2 mm, preferably from 0.75 to 1 , 5 mm.
  • a high-speed flame spraying or an atmospheric plasma method is used for thermal spraying, since both coating methods best meet the requirements placed on them.
  • other coating methods can find their use, wherein the coating method used is largely determined by the coating material used.
  • a coating material is preferably used for thermal spraying, which comprises at least oxide-ceramic materials, carbide-based materials or self-fluxing alloys. Their use excellently favors the generation of edge fillets with the above radii.
  • the strips are ideally at least post-treated prior to thermal spraying, in particular by breaking and / or deburring sharp edges and / or brushing and / or sandblasting. This provides optimum preparation due to the removal of sharp edges, burrs and the like for the subsequent coating of the at least outermost radial regions of the roll.
  • the bands can be provided with the corresponding recesses, for example by means of a laser before the production of the support structure.
  • the strips are treated by brushing, in particular by brushing with nylon brushes containing abrasives, such that they are at least in their outermost radial area in which they are at least temporarily come into contact with the screen, a radius ⁇ 0.05 mm, preferably ⁇ 0.1 mm, in particular ⁇ 0.3 mm, obtained.
  • the strips are provided with a coating prior to their attachment to the roll shell of the roll in such a way that they have a radius ⁇ at least in their outermost radial region in which they at least intermittently contact the wire 0.05 mm, preferably ⁇ 0.1 mm, in particular ⁇ 0.3 mm.
  • the roller of the wire section according to the invention of a machine for the production and / or treatment of a fibrous web, in particular paper or board web, is also outstandingly suitable for use in a conversion of a wire section.
  • the Siebschrumpfbezug a previously used roller can be removed and the emerging bands are formed according to the invention.
  • the recesses in the bands can be introduced, for example by means of a laser or by grinding in the support structure.
  • the support structure can be provided with a thermal spray coating at least in its outermost radial region, in which they at least temporarily contact the screen, the radii facing the screen ⁇ 0.05 mm, preferably ⁇ 0.1 mm, in particular ⁇ 0.3 mm.
  • FIG. 1 shows a fragmentary development of the wings of a first embodiment of a roller shell 3 having a roller 2 of a non-illustrated, the expert but well-known wire section.
  • the roll 2 is, for example, a forming roll or wire suction roll of a machine for producing a fibrous web and serves for the production and / or treatment of the fibrous web, such as a paper or board web.
  • the wire section 1 further comprises at least one screen 4, not shown, which is guided over a partial circumferential area of the roller 2.
  • the sieve 4 can be a fine and multi-layer plastic sieve, for example of the SSB type with a sieve thickness ⁇ 0.6 mm.
  • the titer (Yarn count, yarn size) of a screen thread can have a value in the range of 50 to 120 dtex, preferably from 60 to 90 dtex.
  • the roll shell 3 of the roll 2 has a multiplicity of radial openings 5 and is enveloped by a support structure 6 composed of ribbons 7 standing upright in the direction of the radius Z (arrow) of the roll shell 3 of the roll 2.
  • FIG. 1 In the execution of FIG. 1 is the roll shell 3 of the roll 2 with straight, at least approximately in the circumferential direction Y (arrow) of the roll shell 3 of the roller 2 and extending in the direction of the radius Z (arrow) of the roll shell 3 of the roll 2 upright first bands 7.1 provided.
  • the radial openings 5 are shown for clarity only in a selection.
  • the first bands 7.1 are connected to one another by circumferential corrugations Y (arrow) of the roll shell 3 of the roll 2 and also in the direction of the radius Z (arrow) of the roll shell 3 of the roll 2 upright second strips 7.2 connected to each other, so that as support structure 6, a honeycomb structure 8 with a variety of honeycomb 9 arises.
  • the corrugation of the second bands 7.2 may, for example, have an illustrated trapezoidal basic shape.
  • the compounds of the two bands 7.1, 7.2 executed by known point and / or seam welds.
  • the roll shell 3 of the roll 2 can also be provided with shaped first ribbons running at least approximately in the circumferential direction Y (arrow) of the roll shell 3 of the roll 2 and upstanding in the radius direction Z of the roll shell 3 of the roll 2, so that the support structure again consists of a honeycomb structure with a multiplicity of honeycombs due to the formation of the first bands, at least on the upper side.
  • This type of support structure is, as already stated, for example, from the European patent application EP 0 462 434 A1 known.
  • FIG. 2 shows a sectional view of the roller 2 according to the section line AA of FIG. 1 ,
  • the arranged and cut on the roll shell 3 second belt 7.2 is at least in its outermost radial region 10, in which it at least temporarily comes into contact with the illustrated sieve 4, provided with a thermal spray coating 11, the sieve 4 facing radii R ⁇ 0th , 05 mm, preferably ⁇ 0.1 mm, in particular ⁇ 0.3 mm.
  • the cut second band 7.2 is given by way of example for the other bands 7.1, 7.2, all of which have the respective radius R ⁇ 0.05 mm, preferably ⁇ 0.1 mm, in particular ⁇ 0.3 mm, made of steel, preferably not one consist of an alloy, in particular brass, or a plastic, in particular a CFK or GRP, and a sheet thickness B ⁇ 2 mm, preferably ⁇ 1.5 mm, in particular ⁇ 1.0 mm, have.
  • the thermal spray coating 11 consists of a coating material 12 which comprises at least oxide-ceramic materials, carbide-based materials or self-fluxing alloys.
  • the oxide-ceramic materials may preferably be Cr 2 O 3 , TiO 3 , Al 2 O 3 or mixtures thereof, the carbide-based materials WC / Co, WC / Co / Cr, or Cr 3 C 2 / NiCr and the self-fluxing alloys NiCrBSi.
  • the thermal spray coating 11 has a coating thickness D in the range of 0.5 to 2 mm, preferably 0.75 to 1.5 mm, and a coating hardness HU 1.0 in the range of 3,000 to 15,000 N / mm 2 , preferably from 5,000 to 10,000 N / mm 2 , up.
  • the thermal spray coating 11 may in principle be smaller, equal or, as in the FIG. 2 shown to be greater than the cross section of the second band 7.2. Depending on the design, this results in a shelter, a tie or a supernatant Ü shown.
  • FIG. 3 shows a partial development of the wings of a second embodiment of a roller shell 3 having roller 2 of a non-illustrated, the expert but known wire section 1.
  • the wire section 1 comprises in a known manner at least one screen 4, not shown, which is guided over a partial circumferential area of the roller 2 is.
  • roller 2 similar to that in the FIG. 1 Roller 2 is constructed, will refer to their description at this point.
  • Roller 2 shown are all connected in the circumferential direction Y (arrow) of the roll shell 3 of the roll 2 adjacent honeycomb 9 of the present roller 2 via at least one opening 13, wherein the respective opening 13 is disposed in the second band 7.2 in the outermost radial region 10.
  • some openings 13 are shown.
  • adjacent honeycombs 9 are connected to one another via at least one opening 14, wherein the respective opening 14 in the first belt 7.1 is again arranged in the outermost radial region 10.
  • Some openings 14 are in turn only shown in a selection.
  • FIG. 4 shows a sectional view of the roller 2 according to the section line BB of FIG. 3 ,
  • the opening 13 is opened directed towards the outer radial region 10, whereby a recess 15 is formed in the second band 7.2. Furthermore, in the circumferential direction Y (arrow) of the roll mantle 3 of the roll 2, adjacent second tapes 7.2 without an adjacent recess have a spacing L ⁇ 40 mm, preferably ⁇ 30 mm (cf. FIG. 3 ).
  • the opening 14 mounted in the first band 7.1 can also be provided with a recess, as shown in FIG. 4 is shown as a recess 15 for the attached in the second band 7.2 opening 13.
  • the recess 15 may in principle have any polygonal contour, such as a semicircle shown, a circle segment, a triangle, a quadrangle or the like.
  • the arranged on the roll shell 3 and cut second band 7.2 is again at least in its outermost radial region 10, in which it at least temporarily comes into contact with the illustrated sieve 4, provided with a thermal spray coating 11, the sieve 4 facing radii R ⁇ 0.05 mm, preferably ⁇ 0.1 mm, in particular ⁇ 0.3 mm.
  • FIGS. 1 to 4 illustrated embodiments of the roller 2 can of course be combined with each other, so that ultimately a roller 2 can arise with all possible performance characteristics.
  • FIGS. 1 to 4 illustrated embodiments of the roller 2 can be prepared using the method according to the invention.
  • a coating material which comprises at least oxide-ceramic materials, carbide-based materials or self-fluxing alloys are used here.
  • the bands 7.1, 7.2 are at least aftertreated before the thermal spraying, in particular by breaking and / or deburring sharp edges and / or brushing and / or sandblasting.
  • the belts 7.1, 7.2 are aftertreated in such a way that they have a radius R ⁇ 0.05, at least in their outermost radial region 10, in which they contact the screen 4 at least temporarily mm, preferably ⁇ 0.1 mm, in particular ⁇ 0.3 mm.
  • the bands 7.1, 7.2 before their attachment to the roll shell 3 of the roll 2 are provided with a coating such that they at least in its outermost radial region 10, in which they contact at least temporarily with the wire 4, a radius R ⁇ 0.05 mm, preferably ⁇ 0.1 mm, especially ⁇ 0.3 mm.
  • FIG. 5 shows an exemplary application of the roller 2 in a wire section 1 according to the invention of a machine for producing a fibrous web.
  • Such a wire section 1 is for example from the German patent application DE 101 06 731 A1 known. It has at least one essentially vertical twin-wire section S, in whose initial region SA a forming roller 16 and / or in the deflection region SU and / or end region SE a screen suction roller 17 is arranged. At least one of the two rollers 16, 17 is designed as a roller 2 described above.
  • twin-wire section S of the wire section 1 can also extend obliquely upwards or downwards at an angle to the horizontal, or it can also run horizontally or approximately horizontally.
  • FIG. 5 So represents only an exemplary course of Doppelsiebsize S.
  • the roll 2 of the wire section 1 according to the invention of a machine for producing and / or treating a fibrous web, in particular paper or board web, is, as already stated, also excellent for use in a conversion of a wire section.

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Claims (17)

  1. Partie de tamis (1) d'une machine de fabrication et/ou de traitement d'une bande de matière fibreuse, en particulier d'une bande de papier ou de carton, qui comporte au moins un rouleau (2), en particulier un rouleau de formage ou un rouleau d'aspiration de tamis, et au moins un tamis (4) guidé sur une zone périphérique partielle du rouleau (2), dans laquelle le rouleau (2) comporte une enveloppe de rouleau (3) avec une multiplicité d'ouvertures radiales (5) et dans laquelle l'enveloppe de rouleau (3) est entourée d'une structure de soutien (6) composée de bandes (7, 7.1, 7.2) posées sur chant en direction radiale (Z) de l'enveloppe de rouleau (3) du rouleau (2), caractérisée en ce que les bandes (7, 7.1, 7.2) sont munies, au moins dans leur zone radiale la plus extérieure (10), dans laquelle elles viennent en contact au moins temporairement avec le tamis (4), d'un revêtement déposé par projection à chaud (11), qui présente des rayons (R) tournés vers le tamis (4) ≥ 0,05 mm, de préférence ≥ 0,1 mm, en particulier ≥ 0,3 mm, et en ce que le revêtement déposé par projection à chaud (11) présente une épaisseur de revêtement (D) comprise dans la plage de 0,5 à 2 mm, de préférence de 0,75 à 1,5 mm.
  2. Partie de tamis (1) selon la revendication 1, caractérisée en ce que l'enveloppe de rouleau (3) du rouleau (2) est munie de premières bandes droites (7.1), s'étendant au moins environ dans la direction périphérique (Y) de l'enveloppe de rouleau (3) du rouleau (2) et posées sur chant en direction radiale (Z) de l'enveloppe de rouleau (3) du rouleau (2), qui sont reliées les unes aux autres par des deuxièmes bandes (7.2) ondulées en direction périphérique (Y) de l'enveloppe de rouleau (3) du rouleau (2) et également posées sur chant en direction radiale (Z) de l'enveloppe de rouleau (3) du rouleau (2), de telle manière que la structure de soutien (6) se compose d'une structure en nid d'abeilles (8) avec une multiplicité d'alvéoles (9).
  3. Partie de tamis (1) selon la revendication 1, caractérisée en ce que l'enveloppe de rouleau (3) du rouleau (2) est munie de premières bandes mises en forme (7.1), s'étendant au moins environ dans la direction périphérique (Y) de l'enveloppe de rouleau (3) du rouleau (2) et posées sur chant en direction radiale (Z) de l'enveloppe de rouleau (3) du rouleau (2), de telle manière que la structure de soutien (6) se compose au moins du côté supérieur d'une structure en nid d'abeilles (8) avec une multiplicité d'alvéoles (9).
  4. Partie de tamis (1) selon la revendication 1, 2 ou 3, caractérisée en ce que le revêtement déposé par projection à chaud (11) se compose d'une matière de revêtement (12), qui comprend au moins des matériaux à base d'oxydes céramiques, des matériaux à base de carbures ou des alliages auto-coulants.
  5. Partie de tamis (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que le revêtement déposé par projection à chaud (11) présente une dureté de revêtement (HU 1.0) comprise dans la plage de 3.000 à 15.000 N/mm2, de préférence de 5.000 à 10.000 N/mm2.
  6. Partie de tamis (1) selon l'une quelconque des revendications 2 à 5, caractérisée en ce que des alvéoles (9) voisines en direction périphérique (Y) de l'enveloppe de rouleau (3) du rouleau (2) sont reliées les unes aux autres par au moins une ouverture (13, 15), dans laquelle l'ouverture respective (13, 15) est disposée dans la zone radiale la plus extérieure (10).
  7. Partie de tamis (1) selon l'une quelconque des revendications 2 à 6, caractérisée en ce que des alvéoles (9) voisines en direction axiale (X) de l'enveloppe de rouleau (3) du rouleau (2) sont reliées les unes aux autres majoritairement par au moins une ouverture (14, 15), dans laquelle l'ouverture respective (14, 15) est disposée dans la zone radiale la plus extérieure (10).
  8. Partie de tamis (1) selon la revendication 6 ou 7, caractérisée en ce que l'ouverture (13, 14) est ouverte en direction de la zone radiale la plus extérieure (19), créant ainsi un évidement (15) dans la bande (7.1, 7.2).
  9. Partie de tamis (1) selon la revendication 8, caractérisée en ce que des deuxièmes bandes (7.2) voisines en direction périphérique (Y) de l'enveloppe de rouleau (3) du rouleau (2) sans évidement voisin présentent une distance (L) ≤ 40 mm, de préférence ≤ 30 mm.
  10. Partie de tamis (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que les bandes (7, 7.1, 7.2) sont constituées d'acier, de préférence d'un acier inoxydable, d'aluminium, d'un alliage, en particulier de laiton, ou d'une matière plastique, en particulier d'un CFK ou d'un GFK.
  11. Partie de tamis (1) selon l'une quelconque des revendications 2 à 10, caractérisée en ce que des alvéoles (9) voisines en direction axiale (X) de l'enveloppe de rouleau (3) du rouleau (2) sont disposées en décalage l'une par rapport à l'autre en direction périphérique (Y) de l'enveloppe de rouleau (3) du rouleau (2).
  12. Procédé de fabrication d'un rouleau (2), en particulier d'un rouleau de formage ou d'un rouleau d'aspiration de tamis, à utiliser dans une partie de tamis (1) selon la revendication 1, dans lequel le rouleau (2) comporte une enveloppe de rouleau (3) avec une multiplicité d'ouvertures radiales (5) et dans laquelle l'enveloppe de rouleau (3) est entourée d'une structure de soutien (6) composée de bandes (7, 7.1, 7.2) posées sur chant en direction radiale (Z) de l'enveloppe de rouleau (3) du rouleau (2), caractérisé en ce que les bandes (7, 7.1, 7.2) installées sur l'enveloppe de rouleau (3) présentant une multiplicité d'ouvertures radiales (5) sont munies, au moins dans leur zone radiale la plus extérieure (10) dans laquelle elles viennent en contact au moins temporairement avec le tamis (4), par projection à chaud, d'un revêtement déposé par projection à chaud (11), qui présente des rayons (R) tournés vers le tamis (4) ≥ 0,05 mm, de préférence ≥ 0,1 mm, en particulier ≥ 0,3 mm, et en ce que le revêtement déposé par projection à chaud (11) présente une épaisseur de revêtement (D) comprise dans la plage de 0,5 à 2 mm, de préférence de 0,75 à 1,5 mm.
  13. Procédé selon la revendication 12, caractérisé en ce que l'on utilise pour la projection à chaud une projection à la flamme à grande vitesse ou un procédé au plasma atmosphérique.
  14. Procédé selon la revendication 12 ou 13, caractérisé en ce que l'on utilise pour la projection à chaud un matériau de revêtement (12), qui comprend au moins des matériaux à base d'oxydes céramiques, des matériaux à base de carbure ou des alliages auto-coulants.
  15. Procédé selon la revendication 12, 13 ou 14, caractérisé en ce que l'on soumet les bandes (7, 7.1, 7.2) au moins à un post-traitement avant la projection à chaud, en particulier par cassure et/ou par ébavurage des arêtes vives et/ou par brossage et/ou par grenaillage.
  16. Procédé selon la revendication 15, caractérisé en ce que l'on soumet les bandes (7, 7.1, 7.2) à un post-traitement par brossage, en particulier par brossage avec des brosses de nylon contenant des moyens abrasifs, d'une manière telle qu'elles atteignent un rayon ≥ 0,05 mm, de préférence ≥ 0,1 mm, en particulier ≥ 0,3 mm, au moins dans leur zone radiale la plus extérieure (10), dans laquelle elles viennent en contact au moins temporairement avec le tamis (4).
  17. Procédé selon la revendication 12, 13 ou 14, caractérisé en ce que l'on munit les bandes (7, 7.1, 7.2) d'un revêtement, avant leur placement sur l'enveloppe de rouleau (3) du rouleau (2), d'une manière telle qu'elles atteignent un rayon (R) ≥ 0,05 mm, de préférence ≥ 0,1 mm, en particulier ≥ 0,3 mm, au moins dans leur zone radiale la plus extérieure (10), dans laquelle elles viennent en contact au moins temporairement avec le tamis (4).
EP20070103562 2006-05-24 2007-03-06 Partie tamis d'une machine de fabrication et/ou de traitement d'une bande de matière fibreuse Active EP1860233B1 (fr)

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DE200610024373 DE102006024373A1 (de) 2006-05-24 2006-05-24 Siebpartie einer Maschine zur Herstellung und/oder Behandlung einer Faserstoffbahn

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DE102011077638A1 (de) * 2011-06-16 2012-12-20 Mwn In Niefern Maschinenfabrik Gmbh Walze und Herstellungsverfahren für eine Walze

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DE3210320C2 (de) 1982-03-20 1986-02-06 J.M. Voith Gmbh, 7920 Heidenheim Saugwalze für Papiermaschinen
DE4018890A1 (de) 1990-06-13 1991-12-19 Emil Holz Walze fuer papiermaschinen
DE102004050263A1 (de) 2004-10-14 2006-04-27 Voith Paper Patent Gmbh Walze zur Herstellung und/oder Behandlung einer Faserstoffbahn, Verfahren zur Herstellung der Walze und Anwendung der Walze

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