DE102005017789A1 - web guide element - Google Patents

Abstract

The invention relates to a web guide element (1, 10) for guiding and / or deflecting a running paper, board or other fibrous web (3, 30), which can be acted upon with compressed gas and substantially over the entire width of the fibrous web (3, 30), comprising a jacket (2, 20) with a web guide surface (2a, 20a) associated with the fibrous web (3, 30) and at least one gas permeable, porous layer for separating between the web guide web and the fibrous web (3, 30) passing over it. to form a support film (17, 170). DOLLAR A According to the invention it is provided that the web guide surface (2, 20) of an inner (4, 40) and an outer layer (5, 50), wherein the inner layer (4, 40) is stability-forming and the outer layer (5 , 50) consists of the gas-permeable, porous material, which forms a resistance to the gas flowing through the jacket (2, 20), and at least one chamber between the outer layer (5, 50) and the inner layer (4, 40) (7, 70) for acting on the compressed gas for non-contact guidance of the fibrous web (3, 30) is present.

Description

The The invention relates to a web guide for guiding and / or deflection of a running paper, cardboard or other fibrous web, which with Compressed gas can be acted upon and essentially over the entire width of the fibrous web extends, comprising a sheath with a fibrous web associated Bahnleitfläche and at least one gas-permeable, porous Layer to between the rail guide and the running over it Fibrous web to form a support film

One Web guiding element with an air-permeable, porous and cylindrically shaped Surface is already known from various publications.

On DE-A1 103 22 519 is intended to be referenced here.

With such guide elements to a defined uniform air distribution possible be so that the fibrous web contactless and without risk of Wrinkling during their run through a manufacturing and / or finishing machine feasible is.

In The practice has so far been the flow of air-permeable material and its attachment to a support body is not completely convincing.

Of the The invention is therefore based on the object, an improved web guide to provide with both a contactless guide and Deflection of a fibrous web, as well as a targeted defined Air distribution possible is.

The The object of the invention is achieved by a specified in the characterizing part of claim 1 Bahnleitelement with a jacket, which is assigned to the running fibrous web is.

According to the invention, it is provided that this jacket consists of an inner and an outer layer, wherein the inner layer stability-forming is and the outer layer from the air-permeable, porous Material exists. The porous one Material forms a resistance to the gas flowing through the jacket. Furthermore, it is provided that between the outer and the inner layer at least one chamber for acting on the compressed gas for a non-contact guide the fibrous web is present.

The Inventors have recognized that the gas or preferably to be used Air (conditioned air, i.e., cleaned, filtered, etc.) at Flow through the jacket of Bahnleitelementes experiences a large pressure drop. This Pressure drop causes constant amounts of air to be released. In surprising Way this works even in such cases where the distance of the fibrous web is different to the web guide.

Out For this reason, according to the invention between the outer layer and the inner layer at least one chamber, i. Pressure chamber, incorporated, the targeted influx of the shell or its outer, porous layer possible in that area makes, where the fibrous web over it runs away.

The for the Stability, i.e. also supporting function competent inner layer points for it Passages and connections for the feed of the gas or the air. In these components is not worth mentioning Pressure drop instead. With smaller construction methods, a single one is enough Passage or air connection and possibly also only one chamber.

The inner layer can form both the support itself, but also one additional Take over supporting function.

Advantageous it is in terms of manufacturing cost, if the inner layer is made of a tube or pipe section. critical for the Selection is the intended wrap angle of the fibrous web. At wrap of about 180 ° would you so about choose half a pipe cross section.

Accordingly is then also the outer layer to produce in their size.

A appropriate possibility the attachment of the outer, porous layer on the inner layer is that the outer layer by screwing, Riveting, clamping or gluing to the inner layer is.

The mentioned options lend themselves when the outer layer For example, made of ceramic and with the inner layer, consisting of steel to be fastened. For materials of the outer layer of iron or with portions of chromium and / or nickel and / or molybdenum and / or Aluminum and / or silicon would soldering or welding process to offer.

It is advantageous if the outer layer is connected via individual webs with the inner layer. Between these webs then remains the flow of the outer, porous Layer serving at least one chamber A further advantageous solution of the invention is that the outer layer of individual segments, or longitudinal strips is formed. In addition, it can also be divided into individual transverse sections in the width direction of the fibrous web (or as seen in the length of the web guide element). The web element can thereby be easier to demount and assemble and easier to handle for necessary cleaning or service purposes. It is possible that individual porous layer sections can be easily replaced.

The outer, porous and gas-permeable layer can according to a embodiment through seamlessly over the Scope of the stability-forming layer applied and juxtaposed single longitudinal strips or individual segments getting produced. According to one second embodiment the individual segments have beveled, radial side surfaces and the segments are circumferentially spaced from each other set. In each case such a distance engages as a counterpart the outer layer co-forming terminal block with their wedge-shaped side surfaces. The terminal strips have two-sided paragraphs, each on one opposite recess in the longitudinal element (Segment) rest.

Thereby is the single longitudinal element or segment suitable to adjacent elements with an arcuate layer to build.

By Production of vertical side surfaces, heels and recesses are also rectilinear web guiding elements can be produced.

Each a screw penetrates in the radial direction from below The inner layer penetrates into a single terminal strip a, allowing a fixation of the outer layer is reached and a closed, flat outer periphery of the web guide arises.

In addition are between inner layer and outer layer Seals or other sealing purposes serving separating layers provided, which is the escape of the supplied gas or the air for a porous segment to prevent the neighboring segment.

at the execution with glued segments is in each case one extending in the circumferential direction impermeable Separating layer under the webs, which is a seal to the adjacent segment forms.

The Said seals or separating layers also ensure a zone-wise Profiling the support film between the outer circumference and the Bahnleitfläche the Web guiding element according to the invention and the leading one Fibrous web.

The outer layer can by the way be constructed of several homogeneous layers. It may be advantageous if its air permeability outward decreases or the air resistance increases. In certain cases can It may also be advantageous if the porous layer formed inhomogeneous is and whose air resistance continuously increases towards the outside.

In addition, can It may be beneficial if the outer layer or the individual segments, as already mentioned not machine width, but in the transverse direction (i.e., in the widthwise direction of the fibrous web) Individual parts are made. The manufacturing and assembly effort is easier.

in the According to the invention, it is provided that the layer thickness of the outer layer total between 5 and 25mm and the layer thickness of the stability-forming, inner layer is 5 to 20mm.

In addition, it is provided that the supply pressure supplied to the individual chambers for the non-contact guiding of the fibrous web is in the range between 1 and 10 bar, preferably 1 to 6 bar and the gas or air quantity which can be regulated by this supply pressure and flowing through the layers. 03 to 5m ³ / (min m ² ), preferably 0.5 to 3 m ³ / (min m ² ).

As already noted it makes a lot of sense if the air permeability the outer layer variable in their circumferential and / or transverse or width direction is. This makes it possible that for example in edge regions and / or in the discharge region of the fibrous web the gas permeability stronger is, so more gas or air through the layer or the individual Lay out layers of the layer can and the support film or the support gas cushion quite specifically strengthen themselves leaves.

The Web guiding element according to the invention is intended for an insert within a machine for manufacturing and / or Finishing of a fibrous web, which is preferably a paper or cardboard web should be.

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. With the coating device, the fibrous web should be coated on one or both sides with a liquid to pasty medium. Here it comes in particular to a be non-contact guidance of the web, because the fresh coating layer should not be damaged by any contacts. In addition, the formation of wrinkles should be avoided, because they would have a negative effect on the order quality.

The Bahnleitelement according to the invention can one or more times one or both sides of the web be assigned to the fibrous web along its path.

The invention will be explained in more detail below with reference to exemplary embodiments:
In a schematic representation:

1 and 2 : Various embodiments of a web guiding element according to the invention in cross section

In the 1 is a partial section of a web guiding element according to the invention 1 shown in cross section.

It has a convexly curved jacket here 2 with an outer surface, which has a Bahnleitfläche 2a for an overflowing paper board or other fibrous web 3 forms. The web guiding element 1 shows approximately a quarter-circle-shaped cross-section. In any case, the cross section to be selected (circular or semicircular or the like) depends on the intended angle of wrap over the web guiding element 1 in the direction L to leading fibrous web 3 from.

The coat 2 consists of an inner layer 4 and an outer layer 5 , The inner layer 4 serves the stability formation and is in the example part of a supporting body 6 , The inner layer 4 can be made from a pipe or a pipe segment and is 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 There are several chambers 7 , Which are arranged in the circumferential direction and the application of pressure for a non-contact guidance of the fibrous web 3 serve.

The chambers 7 can be either in the outer or in the inner or at the same time in both layers 4 and 5 be incorporated or created by spacers. In the in 1 Such a last-mentioned embodiment is shown, wherein the spacers as later explained seals 13 are shown.

The inner layer 4 is only with passes 8th for connections 9 for the said admission of the chambers 7 Mistake.

How out 1 becomes clear, is the outer layer 5 from individual segments or longitudinal elements 10 educated.

These are the individual flat segments or longitudinal elements 10 each with bevelled side surfaces 10a , whereby the arched shape of the web guiding element 1 arises, provided. The segments 10 also have an arcuate outer surface and are circumferentially spaced 11 set to each other.

In each case such a distance 10 engages the outer layer 5 co-forming T-shaped terminal strip 12 with their side heels 12a a, which in each case on an opposite recess of the longitudinal element 10 rests. Upon actuation of the indicated screw connections 13 , the inner layer from below 4 pass through, becomes the single longitudinal element or segment 10 with the continuous layer 4 connected.

Between the inner layer 4 and the bottom of the segments 10 are seals 14 arranged, which is the drifting of supplied air from a chamber 7 in an adjacent chamber 7 prevent.

In 2 is a web guiding element 10 shown. This embodiment deviates from that of 1 , which is why all reference numerals are increased by 10 times.

In contrast to 1 is the outer layer 5 herewith 50 again, although again in individual segments 10 (With 100 designated) executed, but cohesively by gluing and seamless stringing together with the inner layer 4 , when 40 designated, connected. The inner layer 40 Here again represents a stable base course and in it are also passages 80 and air connections 90 , Each porous cover strip or segment 100 will have at least one air connection 90 supplied with compressed air. For wide machines, the supply is via several connections 90 advantageous. The chambers 70 can all be provided with the same supply pressure. But it is also a different supply possible around entry and exit areas of the web 30 to supply differently.

The initially mentioned cohesive connection is achieved by the outer layer 50 between the individual chambers 70 remaining bridges 150 with the inner layer 40 is glued. In the chambers 7 the supply pressure is uniform across the width of the Bahnleitelementes 10 distributed. The individual segments 100 are in this version with a release layer 160 connected. The release layer acts like a seal, so no air from a chamber 70 a single segment 100 to the adjacent segment 100 can flow. In this way, an effective zone-wise profiling of the desired support layer 170 between railway control surface 20a and the fibrous web 30 possible.

To the individual segments 10 and 100 is still nachzutragen that they can be performed both machine-wide, as well as individual cross sections. One behind the other can in the latter embodiment, the chambers 7 or 70 the individual sections communicate with each other.

It should also be added that in both embodiments. 1 and 2 the outer layer 5 or 50 a total of a plurality of superimposed, but not shown homogeneous layers may be constructed, wherein the individual air permeability decreases toward the outside or increases their individual air resistance to the outside.

at a single layer, as also shown, the air resistance decreases continuously outward towards.

For both versions according to the 1 and 2 the following dimensions apply:
The layer thickness of the outer layer 5 respectively. 50 total is between 5 and 25 mm, whereas the layer thickness of the stability-forming inner layer 4 respectively. 40 about 5 to 20 mm.

The width of a single segment 100 is about 66mm. The only for the execution according to the 1 applicable terminal strips 12 are manufactured in a width of approx. 33 mm. This width (this corresponds to the width of the crossbar of the T-shape of the terminal block 12 ) also indicates the distance 11 at its widest point, which is located on the outer circumference.

Furthermore, according to both embodiments 1 and 2 that of the chambers 7 respectively. 70 supplied supply pressure for the non-contact guiding of the fibrous web 3 respectively. 30 in the range between 1 and 10 bar, preferably 1 to 6 bar and the controllable by this supply pressure and through the layers 4 respectively. 40 and 5 respectively. 50 flowing air amount about 0.03 to 5m ³ / (min m ² ), preferably 0.5 to 3 m ³ / (min m ² ).

The web element according to the invention 1 and 10 is preferably used immediately after a coating device for coating one or both sides of the fibrous web 3 respectively. 30 ,

Important is that the applied layer of a liquid to pasty application medium, like coating color, glue or starch not damaged and the swelling caused by the order with the train followed by Wrinkling be ironed out can.

On the presentation and description of the special application aggregates should be omitted here, since they are well known.

But it is also one or more times successively one or both sides of the fibrous web 3 respectively. 30 along its path L attributable.

Alles these described embodiments and orders are dependent from the current conditions within a manufacturing and / or finishing machine. Thus, for example, the aforementioned geometric relationships to the respective web speed or the type of fibrous web (e.g., paper grade) to provide optimum runtime efficiency to reach the machine.

The web guiding element 1 respectively. 10 is suitable to be used within a, following on a drying section of a coating machine of a machine for the production and processing 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.

there the installation can only on one side of the web or on both Bahnseiten done.

1, 10

web guide element

2, 20

coat

2a, 20a

Bahnleitfläche

3, 30

Fibrous web

4, 40

inner layer

5, 50

outer layer

6 60

supporting body

7, 70

chamber

8th, 80

passage

9 90

connection

10 100

Cover strips / Segment

10a

side surface

11

distance

12

terminal block

12a

paragraph

13

screw

14

poetry

150

web

160

Interface

170

supporting film

L

direction

Claims (17)

Web guiding element ( 1 . 10 ) for guiding and / or deflecting a running paper, cardboard or other fibrous web ( 3 . 30 ), which can be acted upon with compressed gas and substantially over the entire width of the fibrous web ( 3 . 30 ), comprising a jacket ( 2 . 20 ) with one of the fibrous web ( 3 . 30 ) associated railway control surface ( 2a . 20a ) and at least one gas-permeable, porous layer in order to move between the web guide surface and the fibrous web ( 3 . 30 ) a base film ( 17 . 170 ), characterized in that the rail guide surface ( 2 . 20 ) from an inner ( 4 . 40 ) and an outer layer ( 5 . 50 ), the inner layer ( 4 . 40 ) is stability-forming and the outer layer ( 5 . 50 ) consists of the gas-permeable, porous material, which has a resistance against the jacket ( 2 . 20 ) gas flows through and between the outer layer ( 5 . 50 ) and the inner layer ( 4 . 40 ) at least one chamber ( 7 . 70 ) for acting on the compressed gas for non-contact guidance of the fibrous web ( 3 . 30 ) is available. Web guiding element according to claim 1, characterized in that the inner layer ( 4 . 40 ) at least one passage ( 8th . 80 ) for at least one connection ( 9 . 90 for loading the at least one chamber ( 7 . 70 ) having. Web guiding element according to claim 1 and 2, characterized in that the inner layer ( 4 . 40 ) performs a support function and is made for example of a pipe or pipe segment consisting of steel. Web guiding element according to claim 1 to 3, characterized in that the outer layer ( 5 . 50 ), for example, by screwing, riveting, gluing or clamping with the inner layer ( 4 . 40 ) connected is. Web guiding element according to claim 4, characterized in that the outer layer ( 50 ) over bridges ( 150 ) with the inner layer ( 40 ), wherein between the individual webs ( 150 ), one chamber each ( 70 ) and below the webs ( 150 ) a release layer ( 160 ) is available. Web guiding element according to one or more of claims 1 to 5, characterized in that the outer layer ( 5 . 50 ) from individual segments ( 10 . 100 ) is formed. Web guiding element according to claim 4 and 6, characterized in that the individual segments ( 100 ) lined up seamlessly the railway control surface ( 20a ) or the segments ( 10 ) in the circumferential direction at a distance ( 11 ) are set to each other, wherein in each case such a distance ( 11 ) one the outer layer ( 5 ) mitbildende terminal strip ( 12 ) with their two-sided paragraphs ( 12a ), each on a corresponding recess in the segment ( 10 ) rests, engages and so the railway control surface ( 2a ) .. Web guiding element according to claim 7, characterized in that the individual clamping strips ( 11 ) each by means of a screw ( 13 ) with the inner layer ( 4 ) are releasably connected. Web guiding element according to one or more of claims 1 to 8, characterized in that the outer layer ( 5 . 50 ) Contains proportions of chromium and / or aluminum and / or molybdenum and / or silicon and / or nickel and / or iron. Web guiding element according to one or more of claims 1 to 9, characterized in that the air resistance of the outer layer ( 5 . 50 ) continuously increases toward the outside or the outer layer ( 5 . 50 ) is composed of several homogeneous layers whose air permeability decreases towards the outside or whose air resistance increases towards the outside. Web guiding element according to one or more of claims 1 to 10, characterized in that the layer thickness of the outer layer ( 5 . 50 ) is between 5 and 25 mm in total and the layer thickness of the stability-forming inner layer ( 4 . 40 ) Is 5 to 20mm. Web guide element according to one or more of claims 1 to 11, characterized in that the chambers ( 7 . 70 ) supply pressure for the non-contact guiding of the fibrous web in the range between 1 and 10 bar, preferably 1 to 6 bar and the controllable by this supply pressure and through the layers ( 4 . 40 ; 5 . 50 ) flowing air amount about 0.03 to 5m ³ / (min m ² ), preferably 0.5 to 3 m ³ / (min m ² ), is. Web guide element according to one or more of claims 1 to 12, characterized in that in its circumferential and / or transverse or width direction, the air permeability is variable, so that, for example, in edge regions and / or in the discharge region of the fibrous web ( 3 . 30 ) the air permeability is stronger. Web guiding element according to one or more of Claims 1 to 13, characterized in that the casing ( 2 . 20 ), but at least the outer layer ( 5 . 50 ) in the width direction of the fibrous web ( 3 . 30 ), is applied in individual sections on a continuous, machine-width supporting body Web guiding element according to one or more of Claims 1 to 14, characterized by its use within a machine for producing and / or finishing a paper, board or other fibrous web ( 3 . 30 ). Web guiding element according to claim 15, characterized by its arrangement immediately following a coating device for coating one or both sides of the fibrous web ( 3 . 30 ). Web guiding element according to one or more of claims 1 to 16, characterized in that it can be used one or more times in succession on one or both web sides of the fibrous web ( 3 . 30 ) is assignable along its path.