EP1712502A2 - Elément de guidage d'une bande - Google Patents

Elément de guidage d'une bande Download PDF

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Publication number
EP1712502A2
EP1712502A2 EP06110147A EP06110147A EP1712502A2 EP 1712502 A2 EP1712502 A2 EP 1712502A2 EP 06110147 A EP06110147 A EP 06110147A EP 06110147 A EP06110147 A EP 06110147A EP 1712502 A2 EP1712502 A2 EP 1712502A2
Authority
EP
European Patent Office
Prior art keywords
web
guiding element
element according
outer layer
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06110147A
Other languages
German (de)
English (en)
Other versions
EP1712502A3 (fr
Inventor
Manfred Ueberschär
Benjamin Méndez-Gallon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1712502A2 publication Critical patent/EP1712502A2/fr
Publication of EP1712502A3 publication Critical patent/EP1712502A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/32—Arrangements for turning or reversing webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/10—Means using fluid made only for exhausting gaseous medium
    • B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
    • B65H2406/111—Means using fluid made only for exhausting gaseous medium producing fluidised bed for handling material along a curved path, e.g. fluidised turning bar
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/10—Means using fluid made only for exhausting gaseous medium
    • B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
    • B65H2406/113—Details of the part distributing the air cushion
    • B65H2406/1131—Porous material

Definitions

  • the invention relates to a web guide for guiding and / or deflection of a running paper, cardboard or other fibrous web, which is acted upon with compressed gas and extends substantially over the entire width of the fibrous web, comprising a jacket with a fibrous web associated Bruleit Structure and at least a gas-permeable, porous layer to form a support film between the web guide surface and the fibrous web running over it.
  • baffles With such baffles a defined uniform air distribution should be possible so that the fibrous web can be guided without contact and without the risk of wrinkles during their run through a manufacturing and / or finishing machine.
  • the invention is therefore based on the object to provide an improved web guide, with both a contactless guidance and deflection of a fibrous web, as well as a targeted defined air distribution is possible.
  • the object of the invention is achieved by a specified in the characterizing part of claim 1 Bruleitelement with a jacket which is assigned to the current fibrous web.
  • this jacket consists of an inner and an outer layer, wherein the inner layer is stability-forming and the outer layer consists of the air-permeable, porous material.
  • the porous material forms a resistance to the gas flowing through the jacket. It is further provided that between the outer and the inner layer at least one chamber for acting on the pressurized gas for non-contact guidance of the fibrous web is present.
  • the inventors have recognized that the gas or air preferably used (conditioned air, i.e., cleaned, filtered, etc.) undergoes a large pressure drop as it flows through the shell of the web-guiding element. This pressure drop causes constant amounts of air to be released. Surprisingly, this works even in those cases where the distance between the fibrous web and the web guiding element is different.
  • conditioned air i.e., cleaned, filtered, etc.
  • At least one chamber i. Pressure chamber, incorporated, which makes a targeted influx of the shell or its outer, porous layer possible at that area where the fibrous web passes over it.
  • the inner layer which is responsible for the stability, ie also the support function, has passages and connections for the supply of the gas or the air for this purpose. There is no appreciable pressure drop in these components. For smaller constructions, a single passage or air connection and possibly only one chamber is sufficient.
  • the inner layer can form both the support itself, but also assume an additional support function. It is advantageous in terms of manufacturing costs, if the inner layer is made of a pipe or a pipe section. Decisive for the selection is the intended wrap angle of the fibrous web. When looping around 180 °, you would choose about half a pipe cross-section. Accordingly, then the outer layer is to produce in size.
  • a convenient way of attaching the outer, porous layer on the inner layer is that the outer layer is connected by screwing, riveting, clamping or gluing with the inner layer.
  • the outer layer is made of ceramic, for example, and is to be fastened with the inner layer consisting of steel.
  • the inner layer consisting of steel.
  • soldering or welding processes would also be suitable.
  • outer layer is connected via individual webs with the inner layer. Between these webs then the flow of the outer, porous layer serving at least one chamber remains
  • the outer layer is formed from individual segments or longitudinal strips.
  • it can also be divided into individual transverse sections in the width direction of the fibrous web (or in the length of the web guide element).
  • the web element can thereby be easier to dismantle and assemble and act simpler for necessary cleaning or servicing purposes. It is possible that individual porous layer sections can be easily replaced.
  • the outer, porous and gas-permeable layer can be produced by individual longitudinal strips or individual segments applied and lined up continuously over the circumference of the stability-forming layer.
  • the individual segments have chamfered, radial side surfaces and the segments are set in the circumferential direction at a distance from each other. In each case such a distance engages as a counterpart a co-forming the outer layer terminal block with their wedge-shaped side surfaces.
  • the terminal strips have on both sides heels, which rest on a respective opposite recess in the longitudinal element (segment).
  • the individual longitudinal element or segment is suitable for forming a curved layer with adjacent elements.
  • linearly extending web guiding elements can also be produced.
  • a screw penetrates in the radial direction from below the inner layer and penetrates in each case a single terminal strip, so that a fixation of the outer layer is achieved and a closed, flat outer periphery of Bruleitiatas arises.
  • seals or other sealing purposes serving separating layers are provided which prevent the escape of the supplied gas or the air for a porous segment towards the adjacent segment.
  • Said seals or separating layers also ensure a zone-wise profiling of the support film between the outer circumference and the web guiding surface of the web guiding element according to the invention and the fibrous web to be guided.
  • the outer layer may be composed of a plurality of homogeneous layers. It may be advantageous if the air permeability decreases towards the outside and the air resistance increases. In certain cases, it may also be advantageous if the porous layer is formed inhomogeneous and whose air resistance continuously increases towards the outside.
  • the outer layer or the individual segments as already mentioned not machine width, but in the transverse direction (ie in Width direction of the fibrous web) are made of individual parts. The manufacturing and assembly effort is easier.
  • the layer thickness of the outer layer is a total of between 5 and 25 mm and the layer thickness of the stability-forming inner layer is 5 to 20 mm.
  • the individual chambers supplied supply pressure for the non-contact guiding the fibrous web in the range between 1 and 10 bar, preferably 1 to 6 bar and controllable by this supply pressure and flowing through the layers of gas - or Air amount about 0.03 to 5m 3 / (min m 2 ), preferably 0.5 to 3 m 3 / (min m 2 ).
  • the air permeability of the outer layer in its circumferential and / or transverse or width direction is variable.
  • the gas permeability is stronger, so more gas or air can flow through the layer or the individual layers of the layer and the support film or the support gas cushion very specific can be amplified thereby.
  • the web guiding element according to the invention is intended for use within a machine for the production and / or finishing of a fibrous web, which should preferably be a paper or board web.
  • a preferred application site may be the arrangement of the web guiding element according to the invention for non-contact guidance and / or deflection of the fibrous web immediately after a coating device.
  • the fibrous web should be coated on one or both sides with a liquid to pasty medium. This is particularly important to a non-contact leadership of the web, because the fresh coating layer should not be damaged by any contacts.
  • the Forming wrinkles are avoided because these would adversely affect job quality.
  • the web guiding element according to the invention may be assigned one or both successively to one or both web sides of the fibrous web along its path.
  • FIG. 1 shows a partial section of a web guiding element 1 according to the invention in cross section.
  • the web guide element 1 shows approximately a quarter-circle-shaped cross section.
  • the cross section to be selected depends on the intended wrap angle of the fibrous web 3 leading over the web guide element 1 in the running direction L.
  • the jacket 2 consists of an inner layer 4 and an outer layer 5.
  • the inner layer 4 is used for stability formation and is in the example part of a support body 6.
  • the inner layer 4 can be made of a tube or a pipe segment and made of steel.
  • the outer layer 5 consists of a gas- or air-permeable, porous material which is responsible for the pressure drop. As material proportions of chromium and / or aluminum and / or molybdenum and / or silicon and / or nickel and / or iron come into question. Between the outer layer 5 and the inner layer 4 are a plurality of chambers 7, which are arranged in the circumferential direction and which serve to act on excess pressure for a contactless guidance of the fibrous web 3.
  • the chambers 7 can be incorporated into either the outer or the inner or at the same time in both layers 4 and 5 or by spacers.
  • spacers In the one in Figure 1, such a last-mentioned embodiment is shown, wherein the spacers are shown as later explained seals 13.
  • the inner layer 4 is provided only with passages 8 for connections 9 for said pressurization of the chambers 7.
  • the outer layer 5 is formed from individual segments or longitudinal elements 10.
  • the segments 10 also have an arcuate outer surface and are set in the circumferential direction at a distance 11 to each other. In each case such a distance 10 engages the outer layer 5 co-forming T-shaped terminal block 12 with its lateral shoulders 12a, which rests on a respective opposite recess of the longitudinal member 10.
  • the individual longitudinal element or segment 10 is connected to the continuous layer 4.
  • seals 14 are arranged, which prevent the drifting of supplied air from a chamber 7 in an adjacent chamber 7.
  • FIG. 2 shows a web guiding element 10. This embodiment differs from that of Figure 1, which is why all reference numerals are increased by 10 times.
  • the outer layer 5 is here designated by 50, although also again in individual segments 10 (designated by 100) executed, but materially by gluing and seamless stringing together with the inner layer 4, referred to as 40 connected.
  • the inner layer 40 here again represents a stable support layer and in it are also passageways 80 and air connections 90.
  • Each porous cover strip or segment 100 is supplied with compressed air via at least one air connection 90. In the case of wide machines, the supply via several connections 90 is advantageous.
  • the chambers 70 can all be provided with the same supply pressure. But it is also a different supply possible to supply inlet and outlet areas of the web 30 different.
  • the initially-mentioned cohesive connection is achieved by bonding the outer layer 50 to webs 150 remaining between the individual chambers 70 with the inner layer 40.
  • the supply pressure is distributed uniformly over the width of the web guide element 10.
  • the individual segments 100 are connected to a separating layer 160 in this embodiment.
  • the separating layer acts like a seal, so that no air can flow from one chamber 70 of a single segment 100 to the adjacent segment 100. In this way, an effective zone-wise profiling of the desired support layer 170 between Bruleit Structure 20 a and the fibrous web 30 is possible.
  • the outer layer 5 or 50 may be constructed of a plurality of superimposed but not shown homogeneous layers, wherein the individual air permeability decreases towards the outside and increases their individual air resistance to the outside. In a single layer, as also shown, the air resistance continuously increases towards the outside.
  • the layer thickness of the outer layer 5 or 50 is in total between 5 and 25 mm, whereas the layer thickness of the stability-forming, inner layer 4 or 40 is about 5 to 20 mm.
  • the width of a single segment 100 is approximately 66mm.
  • the applicable only for the embodiment of Figure 1 terminal strips 12 are made in a width of about 33 mm.
  • This width (this corresponds to the width of the crossbar of the T-shape of the terminal block 12) also has the distance 11 at its widest point, which is located on the outer circumference.
  • the chambers 7 and 70 supplied supply pressure for the non-contact guiding the fibrous web 3 or 30 in the range between 1 and 10 bar, preferably 1 to 6 bar and controllable by this supply pressure and air flowing through the layers 4, 40 and 5, 50 is about 0.03 to 5m 3 / (min ⁇ m 2 ), preferably 0.5 to 3 m 3 / (min ⁇ m 2 ).
  • the web element 1 and 10 according to the invention can preferably be used immediately after a coating device for coating one or both sides of the fibrous web 3 or 30.
  • the web-guiding element 1 or 10 is suitable for being used within a coater of a machine following a drying section, for the production and finishing of a paper or board web. However, it could also find application in those areas where the fibrous web tends to wrinkle due to its moisture content.
  • the installation can be done only on one side of the web or on both sides of the web.

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  • Paper (AREA)
EP06110147A 2005-04-14 2006-02-20 Elément de guidage d'une bande Withdrawn EP1712502A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510017789 DE102005017789A1 (de) 2005-04-14 2005-04-14 Bahnleitelement

Publications (2)

Publication Number Publication Date
EP1712502A2 true EP1712502A2 (fr) 2006-10-18
EP1712502A3 EP1712502A3 (fr) 2007-10-10

Family

ID=36729233

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06110147A Withdrawn EP1712502A3 (fr) 2005-04-14 2006-02-20 Elément de guidage d'une bande

Country Status (2)

Country Link
EP (1) EP1712502A3 (fr)
DE (1) DE102005017789A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1218801A (en) * 1967-05-12 1971-01-13 Masson Scott Thrissell Eng Ltd Improvements in web guide members
US5317817A (en) * 1992-04-30 1994-06-07 W. R. Grace & Co.-Conn. Trailing sheet assembly for an air turn
US6722608B1 (en) * 1999-10-28 2004-04-20 Segway Systems, Llc Porous air bearings for tape transports and method of fabrication thereof
GB0402366D0 (en) * 2003-02-07 2004-03-10 Roland Man Druckmasch Web guide for a web-fed rotary printing press
DE10322521A1 (de) * 2003-05-19 2004-12-23 Voith Paper Patent Gmbh Bahnführungs- und/oder Dichtungseinrichtung
DE10322519A1 (de) * 2003-05-19 2004-12-09 Voith Paper Patent Gmbh Bahnführungseinrichtung

Also Published As

Publication number Publication date
DE102005017789A1 (de) 2006-10-19
EP1712502A3 (fr) 2007-10-10

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