DE102004038165B4 - Use of a roller for spreading a running web - Google Patents

Abstract

Use of a roller having the following features: - rotatable spreading roller, which is covered on its circumference with bristles (3.1) whose ends projecting beyond a roller surface are contacted by a running track (8) guided over it, wherein - the bristles (3.1) over their Whole projecting from the brush body (2) length, viewed from the width center and in the axial planes of the roller, obliquely outward on the respective edge region of the moving web (8) with an inclination angle ("gamma"), which is under the bearing pressure the current web (8) by deformation of the bristles (3.1), wherein - the bristles (3.1) in the brush body (2), viewed from the center of width and in the axial planes of the roller, obliquely with outwardly on the respective edge region of the running web (8) pointing angle of inclination ("gamma") are used, wherein - the bristles (3.1) to bristle tufts (3, 10, 11, 12, 23, 24) summarized on the B ürstengrundkörper (2) are mounted, wherein - the expansion roller consists of a plurality of individual straight brush main bodies (2) which are mounted on generatrices of a roller base body (1), wherein - the inclination angle ("gamma"), which lies in the axial planes of the roller and indicates the inclination of the bristles (3.1) relative to the vertical lying in the respective radial section of the bristle base outwards, between 8 ° and 50 °, for spreading a running web (8) by exerting spreading forces transverse to a running direction, wherein the moving web (8) is guided over the rotating roller, which is occupied at least at end portions of a web width with bristles (3.1), wherein the moving web (8) is guided touching or looping under pressure over the bristle ends of the roller, that the Inclination angle ("gamma") under the contact pressure of the moving web (8) by deformation of the bristles (3.1) increased, the current Tray (8) is guided under tension over the roller, wherein the roller is freely rotatable and is carried along by the running track (8) guided over it.

Description

The invention relates to a use of a roller for spreading a running web.

It is known that a moving web, z. As paper web, fabric web or film web, thereby wrinkle free wrinkle (in this application referred to as "spreading") that perpendicular to the running direction spreading forces are exercised. For this purpose, so-called spreader rolls are known for films made of thermoplastic material.

State of the art

One known solution which can be used for thermoplastic films is the slightly curved rubber roller, the so-called banana roller. These rollers are a bit stiff, because the surrounding rubber jacket is constantly deformed.

Another form of spreader roller is the so-called Rundschnurbreithalter, in which the film comes into contact with round cords, which are stretched during contact by a mechanism from the outside and thereby generate a spreading force. These rollers are expensive, may leave marks on the film and require additional drive.

Still other spreader rolls consist of many individual elements that are mechanically pulled outwards during the contact time with the film and thereby generate the spreading force. These spreader rolls are only suitable for very low speeds.

The DE 32 33 214 A1 discloses a helical brush roller. There, the roller for expanding a continuous material spirally projecting elements around the circumference of the roller body.

The DE 36 40 365 C2 discloses a Folienblasanlage for the production of plastic tubular films with arranged in the beginning of the hose forming zone Anblaskühlung and above the hose forming zone substantially delimiting frost line arranged rotating support and / or guide rollers and Flachlegewalzen, wherein in the surface of the rollers circumferential recesses (for the passage of the cooling air between the roller core and the surface of the tubular film are provided.

The patent DE 245093 discloses a roller brush spreader with bristles at an angle to the axis, wherein the position adjustable spreader rollers consist of different discs occupied with straight and oblique bristles, so that the middle bristle portions inhibit the forward movement of the material and the outer accelerate this movement by moving the spool mean bristles obliquely opposite to the direction of movement, the outer, however, are obliquely placed in the direction of movement of the fabric, while in the intermediate bristle rings, the bristles from one to the other of these inclinations pass.

The EP 0 663 363 A1 discloses a lamellar ring, in particular for spreader rolls, wherein the laminar ring has at least one predetermined bending point.

task

The aim of the present invention is to develop a method which does not possess the various above-mentioned disadvantages, which operates substantially maintenance and wear-free and which can be used for any current webs and in particular for sticky films.

The solution results from claim 1 for an inventive use.

Although a brush roller is already through the DE 36 40 365 C2 known. This brush roller is used for removing and laying flat tubular film for guidance and better dissipation of the cooling air.

On the other hand, the invention is based on the finding that the methodically and device-wise difficult application of transverse forces in running webs can be carried out in a very simple manner by the use of a brush roller with the modifications according to the invention. Since the spreader roller can be readily occupied over its entire length with bristles, a constructive adaptation of the spreader roll to the film width is unnecessary.

Since the spreader roll according to the invention can consist of several individual brushes, it can be very easily assembled to different working widths.

These spreader rollers can be mounted at almost any point of a plant without much effort and do not require a complex adjustment or adjustment.

The surprisingly simple realization of the invention is that spreading forces can be applied perpendicular to the running direction of a moving web in a very simple device and a very simple method by the bristles of a brush roller, in the specified Way are inclined to the edge regions of the current path. It is only necessary to guide the web with low pressure under tensile force over the bristle ends.

There is a possibility to power the roller. In this case, the drive speed is selected so that the running speed of the web substantially corresponds to the peripheral speed of the bristle ends in their state deformed by the web, such that there is no relative speed between bristle ends and web in the running direction of the web, by the spreading roller in such a way is driven by a motor, that the peripheral speed of the inclined bristle ends of the running speed of the tension-peeled web substantially corresponds. Such an adjustment of the rotational speed of the brush roller to the running speed of the web and the associated control effort are avoided by the execution as claimed here in the claim.

The method according to the invention is particularly suitable for spreading the webs, of whatever material they may be, without wrinkles, transversely to their running direction, d. H. flatten.

The realization that by selecting suitable bristles with high stiffness and proper selection of the inclination of the bristles thermoplastic materials can not only be deformed, but also easily stretched, is feasible if the web is a sheet of thermoplastic material and the film under the spreading force is deformed or stretched perpendicular to its direction.

The essential finding of the invention is that the bristles of a brush roller deviate from the radial direction at any point in its region protruding from the base body in such a way that a counter-moment or a bending force is exerted on the bristles protruding from the base body by the bearing force of the web is that the bristle deforms with a component which is directed from the longitudinal center of the brush roller to the respective edge region of the web. An embodiment in which the bristles over their entire length projecting from the roll main body - viewed from the width center and in the axial planes of the roller - obliquely outward on the respective edge region of the web at an inclination angle, which is under the contact pressure of the web by Enlarged deformation of the bristles, has the advantage that the applied spreading forces have a steady course in the overflow of the web.

An embodiment with the features that the bristles in the roll main body - viewed from the center of width and in the axial planes of the roller - are inserted obliquely with outwardly pointing to the respective edge region of the track inclination angle, or the bristles in the body perpendicular (radial) be used and then permanently deformed by a mechanical and / or thermal treatment in the inclined position, have the advantage that normal commercial, d. H. straight bristles can be used and that the inclination of the bristles is caused either by the particular way of their attachment to the body (first alternative) or by subsequent deformation.

The embodiment in which the bristles are combined to form bristle tufts mounted on the base body has the advantage that the bristles can be packed very tightly and easily and permanently mounted on the base body.

In one embodiment, such that the expansion roller consists of a plurality of individual straight brush bodies, which are mounted on generatrices of the roller body, not only a manufacturing advantage, but also the advantage that the brushing a spreader roller can be easily replaced when worn. In particular, it is possible to provide the base body with grooves on its circumference, in which then the individual brush strips are inserted and fixed, for example, by end flanges.

According to the bristle stocking of the spreading roller is required only in the edge regions of a film web. However, it is advantageous if the brush trim extends over the entire width of the web, as this spreading forces over the entire width of the web can be applied.

It is particularly advantageous if the spreading roller with the brush stocking is longer than all occurring web widths. In this case, it is unnecessary to apply different spreading rollers for different widths of webs.

An embodiment in which the bristles the bristles are arranged on the base body in two opposing spirals which extend outwardly from the center in a multi-flighted spiral outward such that the brush portions contacted by the web rotate from the inside as the spreader rotates move outside allows moreover a dynamic application of the spreading forces, which proceed from the central region of the film width to the edge regions.

The bristles made of plastic, preferably thermoplastic material such as polyamide or polyester, are so stiff that they have a have defined inclination angle and hold. If the bristles are arranged between webs which are smaller in diameter by the amount necessary for the spreading by the inclined bristles, then it is possible to limit the height of the applied spreading forces independently of the applied pressure of the web. As a result, even tracks can be processed that are sensitive.

If the inclination angle "gamma", which lies in the axial planes of the roller and indicates the inclination of the bristles in relation to the perpendicular lying in the respective radial section of the bristle base to the outside, is between 8 ° and 50 °, preferably between 25 ° and 30 °, then this indicates a suitable tilt range. The actual selected angle of inclination depends on which type of webs are being treated and which spreading forces are to be exerted on the web.

For standard applications, it is preferred that the inclination of the bristles be constant over the entire width of the bristle stock (by equating the angle "gamma", which indicates the inclination of the bristles relative to the vertical outwards, from the width center of the spreader roll to the outside) ,

Means are provided for modifying the application of the spreading forces across the web width (in that the angle "gamma", which indicates the inclination of the bristles relative to the vertical outward, is different from the center of the spreader roll and preferably increases or the stiffness (elasticity) of the bristles varies from the center of the spreader roll to the outside and preferably increases), in particular also can be reduced or reinforced (in that the bristles are not only directed outward, but additionally at the angle "alpha" are inclined in the web running direction, or the bristles are not only directed outward, but are additionally inclined at an angle "beta" against the web running direction).

A further development in which the bristles are provided with a tubular coating, preferably elastic tubular coating, of at least a partial length of the spreading roller which lies in the middle region or in the edge regions of the web width is used in the processing of sensitive materials. The tubular coating, which makes the deformations of the bristles without exerting a substantial additional force on the bristles, is slipped over the spreader roll and envelops the bristles. This avoids damage to the overlying web.

embodiments

With reference to embodiments illustrated in the accompanying drawings, the invention will be explained. Show it

1 a part of a roller body of a spreader roller with a brush body with a bristle trim with obliquely arranged bristles;

2 a spreader roll according to the invention with a roller body with brush main bodies with a bristle stocking with bristle tufts inclined to the right and to the left;

3 a section of a spreader roller, which explains the operation of the spreader roller;

4 the possibilities of the bristle tuft arrangement in relation to a film running direction;

5 a spreader roll in the installed state;

6 a brush element with an elastic coating;

7 another type of bristle arrangement;

8th a spreader roll having a spiral bristle arrangement;

9 a modified spreader roller with webs between individual rows of bristles;

9a a brush strip;

9b a spreader roller with webs and brush strips;

9c other arrangements of webs and brush strips;

10 a spreader roll with a corrugated surface;

11 a spreader roll with obliquely cut bristle tufts;

12 a spreader roll with round cut bristle tufts;

13 a spreader roll, each with three obliquely cut bristle tufts and

14 a bristle tuft with axially cut roof-shaped bristle ends.

2 shows a spreader roll according to this invention. It consists of a roller body 1 and brush bodies 2 with brushes with bristle tufts inclined to the left and to the right 5.1 . 5.2 , The roller body 1 is a cylindrical tube that is in bearings 6 a holder 7 is freely rotatably received. The brush body 2 are tubular body, which on the roller body 1 are rotatably mounted. The brush body 2 are made of a material suitable for brush production, in particular of wood or plastic. The brush bases are on their circumference with bristle tufts 3 occupied. They each extend only over a partial length of the spreader roll and result in the sum of the bristle stocking 5 , It can also be in the edge regions of the web to be treated such brush body 2 to be ordered.

The bristle tufts 3 are aligned differently over the length of the spreader roll. Seen from the longitudinal center of the spreader roller, the bristle tufts have 3 on the left side of the longitudinal center, a slope to the left (see the tufts of bristles 3 the brush 5.1 ) and the bristle tufts 3 on the right side a slope to the right (see bristle tufts 3 the brush 5.2 ). Viewed from the longitudinal center of the spreader roller so are the bristle tufts 3 each directed outwards, ie to the edge regions of a guided over the spreader roller web.

1 shows one of the brush elements with their brush body 2 and a bristle trim 5 with bristle tufts 3 , The bristles 3.1 are also here in the form of a variety of bristle tufts 3 appropriate. All bristle tufts 3 are attached so that the bristles 3.1 have the same inclination. The brush body 2 become so on the roller body 1 pushed that bristle tufts 3 viewed from the longitudinal center of the spreader roller from each obliquely directed outward.

The different bristle tufts 3 of the bristle trim 5 are cut during manufacture so that their outer shape is cylindrical or nearly cylindrical. The particular advantage of the spreader roller is that each individual bristle tufts 3 of the bristle trim 5 completely independent of the other bristle tufts 3 its deformation and thus its spread performs. Thus, it is further ensured that only these bristle tufts 3 exercise a spread that are touched by the web.

With a fixing screw 4 become the individual elements on the roller body 1 fixed.

Instead of the fixing screw 4 can the brush body 2 be provided at their ends with a toothing, which eliminates the need to fix the individual elements.

3 illustrates the operation of the spreader roller. On the brush element of the brush body of the right brush 5.1 is the detail E outlined.

3a shows the bristle tufts 3 of the bristle trim 5 in the unloaded state, ie the bristles 3.1 are undeformed. The angle "gamma" represents the current installation situation. The angle "gamma" can vary depending on the application.

In 3b pushes a foil web 8th with a force K on bristles 3.1 ., causing the bristles 3.1 be deformed as shown. The deformation creates a path 9 that matches the spread, so that the web 8th is pulled outward.

The force K can be exerted by a pressure roller, a pressure board or pressure pad on the film web 8th is placed in the area of the generatrices of the spreader roll, on which the film web 8th touched the spreader roller. The force K can also be exercised by the fact that the film web 8th is guided over the spreader roll with a certain tensile force. It should the stiffness of the bristles 3.1 be so dimensioned that with a vertical force of 0.25 N on an inclined bristle tufts 3 a deformation in the direction of force of ΔR = 0.2-0.5 mm is formed, which corresponds to a reduction in diameter of the spreader roll of 0.4-1.0 mm. The diameter of each bristle 3.1 is 0.12-0.25 mm, the length of the bristles 3.1 at 8-10 mm. Per bristle tufts 3 will be about 100-200 individual bristles 3.1 used.

4 shows the different possibilities, the bristle tufts 3 on the brush body 2 to arrange. tufts 10 are only in the axial plane, in which they are out of the brush body 2 emerge, to the edge area, ie outward, directed, bristle tufts 11 are additionally rotated by the angle "alpha" out of this axial plane in the direction of film travel, bristle tufts 12 are additionally rotated by the angle "beta" against the direction of film travel from this axial plane. As a result, the intensity of the spreading effect can be influenced.

5 shows the spreader roll according to the invention in the operating state. The roller with the roller body 1 is from the film web 8th driven and turns in camps 6 in a holder 7 , Through the bristle tufts arranged at an angle to the outside 3 of the bristle trim 5 the film web is spread outwards and thus becomes wrinkle-free guided over the spreader roll. To influence the spreading effect of the wrap angle can be varied. Depending on the installation situation, the wrap angle can be between 2 and 180 °. It is also possible, instead of just one spreader roll, to arrange several in succession.

An advantage of the spreader rolls according to the invention is further that the film web 8th only comes into contact with the bristle tips and thus creates a very small contact surface. As a result, negative influences such as sticking or surface stripes are avoided. It is also particularly advantageous that no mechanical parts are used for the spreading, whereby a long service life is achieved, in addition, the spreading forces act at any speed without problems.

For this reason, the spreader roll according to the invention is particularly suitable as a spreader roll for thermoplastic films, but also for paper and fabric webs. The applied spreading forces are sufficient to lay the films in the direction of the indicated, pointing to the edge areas arrows smooth and to prevent wrinkling.

6 shows a brush element with a coating 13 that over the bristles 3.1 is pulled. The tubular coating 13 can be seen - over the length of the spreader roll - consist of several individual segments, preferably with the length of the individual brush body 2 coincide. The coating 13 is preferably weakly elastic. By drawing on the spreader roll, the tubular coating 13 through the bristles 3.1 slightly tense while the bristles 3.1 deform weakly.

By the coating 13 you get a closed surface, which may be advantageous for certain materials.

7 represents a section of the brush body 2 with vertically inserted bristles 14 which are deformed in a further operation by mechanical and / or thermal treatment in the inclined position.

8th shows a spreader roll, in which the bristles 3.1 are spirally mounted so that they move during the rotational movement to the outside and thus achieve an additional spreading effect.

It can be seen that the slope of a spiral line 15 or helix is so small that arise over each half the roll length several, preferably a plurality of turns. It is also an arrangement of the bristles 3.1 possible in multi-threaded helices.

9 shows the cross section of a spreader roll with a modified bristle arrangement. In this case, a roller body is 16 in which the bristles 3.1 or bristle tufts 3 are fixed, shaped so that between bristle rows 18 in the axial direction, a bridge 17 stop. The jetty 17 limits the deformability of the oblique bristles 3.1 to a degree 19 around which the diameter of the bristles 3.1 greater than the diameter of the webs 17 , The measure 19 thus determines the deformation of the brushes of the row of bristles 18 and limits the spreading force, since from a certain film tension the film web 8th on the jetties 17 rests and the brushes can not be further deformed.

9a shows a brush strip 26 which is distributed along the length with a variety of bristles 3.1 are used with inclination to the longitudinal direction. The brush strips 26 are arranged so that they are in a roll center 28 touch and each with bristle tufts, which are in a strip body 31 are attached, are inclined to the roll end. A flange 29 at each end of the roll, the brush strips ensure 26 against move. Instead of the individual bristle tufts 3 . 23 . 24 can in the webs 17 also brush strips 26 be used.

9b shows the arrangement of the webs 17 and brush strips 26 in the axial direction along the generatrices.

9c shows schematically the arrangement of the webs 17 and brush strips 26 in a V shape 32 and in an arch shape 33 , where a V or Bogenformhöhe 34 and 35 at least as large as the distance of the brush strips 26 ,

10 shows an embodiment of the spreader roll with a corrugated surface 20 , The purpose of this embodiment is that at low film tension only the outermost region comes in contact and these bristles 3.1 with the full deflection, while the lower lying bristles 3.1 only work with increasing foil tension.

11 shows a similar bristle tufts shape 22 , in which case each bundle is obliquely cut off at the angle "lambda", wherein a height difference 21 is about 1-2 mm. Again, the height of the spreading depends on the height of the web tension, since the bristles 3.1 by the pressure of the film web 8th experience a different inclination until all bristle ends lie on the surface line, which the film web 8th occupies.

12 shows another form of bristle tufts 23 , Here are the bristle tufts 23 each cut off in a rounded manner. The advantage is that the bristles loaded first 3.1 in the middle of the bristle tufts 23 lie and thus from the other bristles 3.1 be supported.

13 shows a variant of the progressive shaping. Here, the slope runs over three bristle tufts 24 , This makes the characteristic softer. This version has the basis of 10 . 11 described effect.

14 shows a roof-shaped bristle tufts shape 25 , but this time runs in the axial direction. The behavior is similar to the bristles in 12 , the manufacture is u. But easier.

LIST OF REFERENCE NUMBERS

α (alpha)

Winkel der Borstenbüschel in Laufrichtung gedreht

β (beta)

Winkel der Borstenbüschel entgegen Laufrichtung gedreht

γ (gamma)

Neigungswinkel der Borstenbüschel in Richtung Walzenende

λ (lambda)

Borstenschnittwinkel

List of used angles

α (alpha)

Angle of bristle tufts turned in running direction

β (beta)

Angle of bristle tufts turned counter to running direction

γ (gamma)

Tilt angle of the bristle tufts towards the end of the roll

λ (lambda)

Bristle cutting angle

Claims (1)

Use of a roller having the following features: - rotatable spreading roller which has bristles on its circumference ( 3.1 ) whose ends projecting beyond a roller surface are guided by a running track ( 8th ), wherein - the bristles ( 3.1 ) over their whole from the brush body ( 2 ) projecting length, viewed from the middle of the width and in the axial planes of the roller, obliquely outward on the respective edge region of the moving web ( 8th ) with an inclination angle ("gamma"), which is below the contact pressure of the moving web ( 8th ) by deformation of the bristles ( 3.1 ), wherein - the bristles ( 3.1 ) in the brush body ( 2 ), viewed from the middle of the width and in the axial planes of the roller, obliquely with outwardly on the respective edge region of the moving web ( 8th ) angle of inclination ("gamma") are used, wherein - the bristles ( 3.1 ) to bristle tufts ( 3 . 10 . 11 . 12 . 23 . 24 ) summarized on the brush body ( 2 ) are mounted, wherein - the spreading roller of a plurality of individual straight brush main bodies ( 2 ), which lie on the generatrices of a roll body ( 1 ), wherein - the angle of inclination ("gamma"), which lies in the axial planes of the roller and the inclination of the bristles ( 3.1 ) relative to the perpendicular lying in the respective radial section of the bristle base outwards, lies between 8 ° and 50 °, for spreading a running web ( 8th ) by exerting spreading forces transverse to a running direction, the running web ( 8th ) is guided over the rotating roller, which at least at end regions of a web width with bristles ( 3.1 ), the running track ( 8th ) is guided under pressure or over the bristle ends of the roller in such a way that the angle of inclination ("gamma") under the contact pressure of the moving web ( 8th ) by deformation of the bristles ( 3.1 ), whereby the moving web ( 8th ) is guided under tension over the roller, wherein the roller is freely rotatable and is guided by the moving track ( 8th ) is taken.

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