EP1228993A2 - Roller for winding a material web - Google Patents

Abstract

The core (14) for winding a paper web has a flexible sleeve (18) or a series of flexible rings fitted on it. These have greater flexibility at the ends (24, 24') of the core than at its center, compensating for bending of the core when the roll (12) is fully formed.

Description

The invention relates to a roller or a spool for winding a material web, especially paper web.

With the usual versions of reels it comes with big ones Winding diameters and widely spaced bearings to a clear Deflection of the drum core, which is a slope of the edges or Ends. This leads to shifting of the layers in the winding material, the result Can be shiny spots. The higher edge pressure in the paper layers leads to a bending stress of the winding material, which causes shear stresses between the layers of paper arise that can cause the relative shifts. The deflection thus represents the actual dimensioning criterion for such drums, which means that wall thickness and diameter and consequently, the weight and cost of each reel by a relatively small one Border area are determined.

In a winding sleeve known from EP-B-0 500 515 is a double-walled Pipe construction provided with two support bearings, creating the bending line of the outer tube in the sense of an equalization or reduction the edge inclination of the outer tube is influenced. Even with one the roller known from DE-B-22 11 892 is again a two-body roller construction provided, the inner body by a full or massive roll core is formed. A straight jacket tube outside is here a conical Execution of the core reached, on which the pipe with increasing Load applied. The pipe can be supported hydraulically or pneumatically at the edge his.

In an elastic roller for pressure treatment known from DE-B-23 16 746 von Warenbahnen is a multi-part roller tube / roller core construction provided, the tube being made of thermoplastic material. A non-rotatable, but longitudinally movable support of the pipe in the edge areas and in the middle serves to compensate for expansion in the event of larger temperature differences due to different coefficients of thermal expansion. DE-A-197 29 907 describes a roller with a two-body roller core construction described, in which the tube is supported centrally on the core and a wall thickness contour tapering towards the edges is provided. Here it’s not about compensating for the global deflection of the roll core, but rather to keep the curvature of the bending line as constant as possible To get roller tube and thus a spreading effect.

From DE-A-37 03 563 is a drawing roller or the like for paper machine towels known, which has a double-walled roller construction, with the outer tube made of fiber-reinforced plastic in the middle supported on the inner metal tube. Here, too, there is a spreading effect and not to compensate for the global deflection of the inner tube.

The aim of the invention is to provide an improved roller of the type mentioned create, in which the global deflection of the roller body at least partially compensated and the deflection of the roll surface line accordingly is reduced.

This object is achieved according to the invention by a roller for winding a material web, in particular paper web, with a base body and a peripheral surface in contact with the web as a result of a corresponding, at least in sections on the base body applied flexible layer and / or at least a corresponding flexible one arranged on the base body Elements in the area of the two roller ends have greater radial compliance has in the middle of the roll area, around a maximum winding diameter resulting deflection of the base body at least partially compensate.

Due to this training, even with larger winding diameters and larger bearing distances, the deflection of the base body at least so far reduced that larger edge inclinations are excluded, which also means Shifting of the layers in the winding material leading to shiny spots can be avoided. The Compensation takes place in the area of the surface of the roll body, whereby basically a kind of Winkler bedding is achieved. After at appropriate Setting the material parameters no longer dimensioning through the vertical deflection of the drum or the edge slope defined there is a significant weight reduction. With the lower drum or Roll weight also results in a correspondingly lower load on the Lifting and transport equipment. The additional cost is minimal. Already existing drums can be easily adapted accordingly. A New production is not necessary. Given the weight loss is too no adjustment of the lifting, transport and drive equipment required. The radial layer or element thickness can be viewed in the direction of the roller axis be different. Alternatively or additionally, the radial stiffness the respective layer or elements in the direction of the roller axis considered to be different.

In certain cases it is advantageous if preferably in the middle roller area at least one particularly rigid support point is provided, in the Area the circumferential surface in contact with the web has a correspondingly smaller radial Has flexibility than in the area of the two roller ends.

In an expedient practical embodiment, there are several in the axial direction spaced apart, in particular rigid support points provided, in the area of which the circumferential surface in contact with the web has a corresponding one has smaller radial flexibility than in the area of the two roller ends.

Preferably, at least one rigid support point is at least partially through the Basic body itself.

The peripheral surface in contact with the web is expediently through a base body surrounding, in particular flexible tube formed, the flexible Layer or the flexible element radially between the base body and the pipe is arranged. The preferably flexible tube is used in particular the homogenization of the roller or drum surface. In particular, it can consist of metal or, for example, by a rubber cover or the like. This pipe would be in the dimensioning of the flexible layer or the flexible elements to take into account. In contrast to the known rollers, it is not a bending stress, carrying pipe.

In a preferred advantageous embodiment of the invention The roller has a flexible layer at least in the area of the two roller ends applied the basic body, which has a constant radial over its axial length Stiffness and generally increasing towards the respective roller end Has thickness. The thickness of the flexible layer can vary Roll end towards at least substantially in accordance with the deflection of the base body resulting in the maximum winding diameter. The base body is preferably at least towards the respective roller end essentially according to the increasing thickness of the flexible Tapered layer.

Provided there is a compressible layer, the superficial one Indentation of the flexible layer a deformed, smaller in diameter Edge area, which causes an expansion of the layers in the edge zones in the lower roller or drum area conditional, which favors the escape of air becomes. However, the radial tension is lost. The goal must be the Keep diameter constant, and not only partial deflection compensate.

In particular, a rubber-elastic layer can be provided as the flexible layer his.

The flexible layer can in particular also be formed by an inhomogeneous layer made of foamed material and / or a honeycomb structure etc.
In an expedient practical embodiment, the flexible, preferably rubber-elastic layer provided at least in the region of the two roller ends is provided between the base body and the flexible tube formed in particular by a rubber cover or the like.

According to a further advantageous embodiment of the invention The roller has a flexible layer at least in the area of the two roller ends applied the basic body, which has a constant thickness over its axial length has and generally increasing radial towards the respective roller end Compliant.

The flexible layer can therefore in particular vary over its axial length Own modulus of elasticity. In most cases, however, it should be easier to provide discrete flexible elements such as discrete spring elements.

Thus, according to a further advantageous embodiment of the roller according to the invention, a plurality of flexible elements which are spaced apart from one another in the axial direction are provided, with the radial distances of the circumferential surface in contact with the web being greater in the region of the two roller ends compared to the central roller region, their mutual spacings being selected accordingly and or whose flexibility is correspondingly different. The flexible elements can each be formed at least partially by a discrete spring element. For example, rubber-elastic annular bodies and / or spring assemblies extending over the circumference of the base body can be provided as discrete spring elements.
The flexible elements can be at least partially prestressed.

To make the peripheral surface in contact with the web more uniform, a preferred one can again be used flexible pipe must be drawn up.

The base body is preferably provided as a hollow body, since this is based on weight Advantages.

According to a further advantageous embodiment of the invention Rollers are applied to the base body at least in sections flexible layer and / or at least the corresponding one on which Base body arranged flexible element at least two preferably symmetrically arranged tie rods attached. The advantage here is that the Deflection of the roll surface line due to the balance of forces and absorption is further reduced. Such tie rods are well known to those skilled in the art and are already used in practice in many cases.

Depending on the load, the tie rods can be axially parallel and / or approximate axially parallel to the basic body or crossing diagonally or be arranged helically to the base body.

Furthermore, the tie rods are advantageously at the end of the roller braced at least two outer walls, the tie rods diagonally or can be braced at right angles.

With regard to optimal functioning, the tie rods are in the radial direction the roller is held in position by means of at least one spacer.

Figur 1

eine schematische, teilweise geschnittene Darstellung einer Walze zum Aufwickeln einer Materialbahn mit einer auf den Grundkörper aufgebrachten flexiblen Schicht und einer im mittleren Walzenbereich vorgesehenen Stützstelle höherer Steifigkeit;

Figur 2

eine schematische, teilweise geschnittene Darstellung einer weiteren Ausführungsform der Walze mit zwei in Axialrichtung einen Abstand voneinander aufweisenden Stützstellen;

Figur 3

eine schematische, teilweise geschnittene Darstellung einer weiteren Ausführungsform der Walze mit mehreren, in Axialrichtung einen Abstand voneinander aufweisenden flexiblen Elementen und einer im mittleren Walzenbereich vorgesehenen Stützstelle höherer Steifigkeit;

Figur 4

eine schematische, teilweise geschnittene Darstellung einer möglichen Ausführungsform eines Walzengrundkörpers mit einem sich zu den Enden hin verjüngenden Querschnitt;

Figur 5

eine schematische, teilweise geschnittene Darstellung einer weiteren Ausführungsform der Walze mit Zonen unterschiedlicher Steifigkeit;

Figur 6

eine schematische, teilweise geschnittene Teildarstellung einer weiteren Ausführungsform der Walze mit einer im Bereich der Walzenenden auf dem Grundkörper aufgebrachten, zwischen diesem und einem Gummibezug angeordneten flexiblen Schicht von zum jeweiligen Walzenende hin zunehmender radialer Dicke; und

Figur 7

einen beispielhaften Verlauf des Papierdrucks der oberen Mantellinie der Walze beziehungsweise des Tambours entlang der Walze ausgehend vom Tambourrand zur Tambourmitte hin sowie einen beispielhaften Verlauf der vertikalen Durchbiegung der oberen Mantellinie des Tambours.

The invention is described below with reference to exemplary embodiments with reference to the drawing; in this show:

Figure 1

is a schematic, partially sectioned illustration of a roller for winding a material web with a flexible layer applied to the base body and a support point of higher rigidity provided in the middle roller region;

Figure 2

is a schematic, partially sectioned illustration of a further embodiment of the roller with two support points spaced apart in the axial direction;

Figure 3

a schematic, partially sectioned representation of a further embodiment of the roller with a plurality of flexible elements spaced apart from one another in the axial direction and a support point of higher rigidity provided in the central roller region;

Figure 4

is a schematic, partially sectioned illustration of a possible embodiment of a roller base body with a cross section tapering towards the ends;

Figure 5

a schematic, partially sectioned representation of a further embodiment of the roller with zones of different stiffness;

Figure 6

a schematic, partially sectioned partial representation of a further embodiment of the roller with a flexible layer applied to the base body in the region of the roller ends, arranged between the latter and a rubber cover, of increasing radial thickness towards the respective roller end; and

Figure 7

an exemplary course of the paper printing of the upper surface line of the roller or the spool along the roller starting from the edge of the spool to the center of the spool and an exemplary course of the vertical deflection of the upper surface line of the spool.

Figures 1 to 6 show different embodiments of a roller 10 for Winding up a web of material 12, which is in particular a paper web can act.

The roller 10 in each case comprises a base body 14, which for example has an end Pin 16 is stored accordingly.

As a result of a corresponding, at least in sections, on the base body 14 applied flexible layer 18 and / or at least one corresponding, The flexible element 20 arranged on the base body 14 has the contact with the web Circumferential surface 22 in the region of the two roller ends 24, 24 ' greater radial compliance or less rigidity than in the middle Roll area around a resulting at maximum winding diameter To compensate for the deflection of the base body 14 at least partially.

The radial layer or can be viewed in the direction of the roller axis Element thickness and / or the radial rigidity of the respective layer respectively of the elements vary in the direction of the roller axis.

FIG. 1 shows a roller in a schematic, partially sectioned illustration 10 with a flexible layer 18 applied to the base body 14 and one support point 26 of higher rigidity provided in the middle roller region, in the area of which the circumferential surface 22 in contact with the web is correspondingly smaller has radial flexibility than in the region of the two roller ends 24, 24 '.

In the present case, the peripheral surface 22 in contact with the web is through a base body 14 surrounding, in particular flexible tube 28 is formed. This tube 28 lies directly on the stiffer support point 26 in the middle roller region. in the remaining space between the tube 28 and the base body 14 the flexible layer 18 is arranged.

As can be seen from FIG. 1, the maximum angular diameter resulting global deflection of the base body 14 at least partially compensated so that there is an at least substantially horizontal Surface line 30 results.

The flexible layer is also in the embodiment shown in FIG 18 again between a particularly flexible tube 30 and the base body 14 provided. In this case, two are a distance apart in the axial direction having stiffer, in particular rigid support points 26 is provided. The remaining space between the tube 30 and the base body 14 again by an elastic layer 18 or corresponding elastic Items filled in. In the area of at least in sections on the Base body 14 applied flexible layer 18 are preferably at least two symmetrically arranged tie rods 34 (only symbolic representation by means of dashed lines). The tie rods 34 may vary Embodiment and load case axially parallel and / or approximately axially parallel to the base body 14 or crossing diagonally or helically be arranged to the base body 14. The tie rods 34 are the front of the Roller 10 by means of at least two outer walls 36 (only symbolic representation by means of lines), preferably diagonally or at right angles. In radial The tie rods are in the direction of the roller 10 by means of at least one spacer 38 are held in position. When using at least two spacers can be arranged according to the respective load case are.

In the embodiment according to FIG. 3, the base body 14 is again from surrounded a particularly flexible tube 30. In this case it is in the middle A relatively rigid support point 26 is again provided in the roller region. In this case are starting from the middle roller area towards the two roller ends in each case two elastic elements having an axial distance from one another 20 arranged between the tube 30 and the base body 14. This elastic Elements 20 can be made of rubber, for example, or by springs, for example steel springs. For example, it can be rubber-elastic annular body or over the circumference of the base body 14 extending spring assemblies or the like may be provided. At least in the area of the corresponding, arranged on the base body 14 flexible Elements 20 are at least two preferably symmetrically arranged tie rods 34 (only symbolic representation with dashed lines) attached.

FIG. 4 shows a possible illustration in a schematic, partially sectioned illustration Embodiment of a roller base body 14 with a towards the ends tapered cross section. In the middle area of the roller, in particular another support point 26 may be formed, in the area of which the circumferential surface in contact with the web again a correspondingly smaller radial compliance or has higher rigidity than in the area of the two roller ends.

On the sections tapering towards the respective roller end Base body 14 can, for example, have a flexible layer accordingly varying radial layer thickness or for example discrete elastic elements be applied with appropriate varying thickness. Even with the same Stiffness of the relevant layer or the relevant Elements thus have a higher flexibility towards the roller ends or less rigidity of the surface in contact with the web.

FIG. 5 shows another in a schematic, partially sectioned illustration Embodiment of a roller 10 with successive zones in the axial direction different stiffness, for example by corresponding sections 18 'of a flexible layer or by correspondingly different flexible elements 20 can be formed.

In this embodiment, the web contacting surface 30 can pass directly through the flexible layer or the elastic elements can be formed. It So there is no external flexible tube provided.

FIG. 6 shows another part in a schematic, partially sectioned illustration Embodiment of the roller 10 with one in the region of the roller ends Base body 14 applied flexible layer 18. This flexible layer 18 is in the present case in the area of a respective roller end between one section of the base body 14 and an outer flexible formed here for example by a rubber cover Tube 28 arranged.

In the present case, therefore, at least in the area of the two roller ends a flexible layer 18 may be applied to the base body 14, which over their axial length has a constant radial rigidity and to the respective roller end has an increasing thickness.

As can be seen from FIG. 6, the radial thickness d is the flexible one Layer 18 is greatest in the area of the relevant roller end.

The roller can be closed at both ends by a cover 32 be one of which can be seen in Figure 6.

In general, the base body 14 can be provided as a hollow body. He can be made of steel, for example.

According to a first variant, for example, one over the length of the surface in contact with the web has a constant rigidity (modulus of elasticity) flexible Be applied layer in the thickness from the center to the edge in Ratio of the global deflection of the base body increases. To a cylindrical The outer contour of the unloaded roller or reel receive, the edge region of the, for example, formed by a metal tube Base body be conical or parabolic.

According to a second variant, for example, one over the length of the surface in contact with the web has a flexible layer which is constant in thickness be, whose rigidity from the center of the roller to the edge in relation to the global deflection of the drum drops. The base body can be cylindrical be executed.

In principle, for example, a combination of the two mentioned above is also possible Variants possible.

The implementation of the first variant is in particular by a rubber elastic Layer possible, which is applied in the peripheral zones within a rubber cover becomes. The material properties of this layer are then preferred determined by the requirement of a horizontal surface line that is as horizontal as possible.

The implementation of the second variant would be carried out as a material layer require a variable modulus of elasticity across the web width. An easier one The possibility to be realized is, for example, discrete elastic To use elements or spring elements, for example, by Change the distance between these elements and / or by a different one Element stiffness the required variability of the bed stiffness enable. To even out the surface of the roller or drum To achieve this, an outer tube can be pulled on (wall thickness for example 5 - 10 mm for a version made of metal, for example). Such one outer tube would have to be taken into account when dimensioning the spring elements. However, it is not to be compared with the stressed, load bearing Tubes of the usual drum. The spring elements can for example formed by rubber-elastic, ring-shaped bodies or, for example, as metal spring packages wound all round. There is also a preload of these elements conceivable.

Particularly constant in connection with the aforementioned first variant Stiffness or constant modulus of elasticity (compare, for example also FIG. 6) the material parameters can at least essentially can be determined or determined as follows, for example:

The flexible layer can in particular be modeled as a homogeneous layer (edge thickness, for example 20 mm, thickness towards the center of the drum, for example, about 5 mm, length, for example, about 3000 mm) with an elastic modulus of about 1 N / mm ² . This size represents a lower limit for the elasticities of polymeric materials (modulus of elasticity between 1 and 500 N / mm ² ). A rubber cover can serve as a protective layer against the flexible layer.

Based on calculations, the result is that in this case, despite a significantly higher total deflection of the base body, the difference in the deflection of the surface in contact with the web (rubber covering) between the edge and the center has decreased significantly. The greater total deflection of the base body results, on the one hand, from the reduction in wall thickness of the inner body formed, for example, by a metal tube in the edge zones (conical course from, for example, 40 to, for example, 20 mm), and on the other hand from the uniformity of the paper pressure on the surface in contact with the web (see figure 7). As can be seen from FIG. 7, only the abrupt end of the flexible layer leads to a pressure peak at this point. This transition should be optimized.
To completely compensate for the global deflection of the base body, its contour would have to be parabolic. It can also be seen that the material with 1 N / mm ^{2 is} slightly too stiff with the assumed layer thicknesses. This could be compensated for by a further increase in the layer thickness in the edge areas or by an even lower modulus of elasticity of the material.

• hochelastisch, auch nach zum Beispiel 10⁸ Lastwechsel;
• geringe Walk-/Deformationsarbeit, trotz großer Deformation bei jeder Umdrehung;
• Temperaturbeständigkeit bis zu jener Temperatur, die durch die Deformationsarbeit entsteht;
• kostengünstige Herstellung und einfache Aufbringung auf das Rohr.

The material of the flexible layer expediently has to meet the following requirements in particular:

• highly elastic, even after e.g. 10 ⁸ load changes;
• little flexing / deformation work, despite large deformation with every revolution;
• Temperature resistance up to the temperature that results from the deformation work;
• cost-effective production and easy application on the pipe.

If the expediently required properties are not due to a homogeneous Material could be fulfilled would be an inhomogeneous material, for example with webs and cavities, or to use a foamed material. The continuation of such an exemplary approach would be immediate again lead to the previously mentioned second embodiment, whereby here the variable stiffness in the transverse direction, for example, by isolated, different stiff, ring-shaped spring elements could be realized.

LIST OF REFERENCE NUMBERS

10

Roller, drum

12

Material web, paper web

14

body

16

spigot

18

Flexible layer

18 '

layer portion

20

Flexible element

22

peripheral surface in contact with the web

24

roll end

24 '

roll end

26

support point

28

pipe

30

generating line

32

cover

34

tie rods

36

outer wall

38

spacer

d

radial thickness

Claims (27)

Roller (10) for winding up a material web (12), in particular a paper web, with a base body (14) and a peripheral surface in contact with the web (22), which as a result of a corresponding, at least in sections, on the Base body (14) applied flexible layer (18) and / or at least a corresponding flexible one arranged on the base body (14) Elements (20) in the area of the two roller ends (24, 24 ') a larger one radial resilience is around one in the middle roll area deflection of the base body at maximum winding diameter (14) to compensate at least partially. Roll according to claim 1,
characterized in that the radial layer or element thickness is different when viewed in the direction of the roller axis. Roller according to claim 1 or 2,
characterized in that the radial stiffness of the respective layer (18) or of the elements (20) is different when viewed in the direction of the roller axis. Roll according to one of the preceding claims,
characterized in that at least one in particular rigid support point (26) is preferably provided in the central roller region, in the region of which the peripheral surface (22) in contact with the web has a correspondingly smaller radial flexibility than in the region of the two roller ends. Roll according to one of the preceding claims,
characterized in that several, in particular rigid support points (26) spaced apart from one another in the axial direction are provided, in the area of which the peripheral surface (22) in contact with the web each has a correspondingly smaller radial flexibility than in the area of the two roller ends. Roller according to claim 4 or 5,
characterized in that at least one rigid support point (26) is at least partially formed by the base body (14) itself. Roll according to one of the preceding claims,
characterized in that the peripheral surface (22) in contact with the web is formed by a, in particular flexible, tube (28) surrounding the base body (14) and the flexible layer (18) or the flexible element (20) radially between the base body (14) and the tube (28) is arranged. Roll according to claim 7,
characterized in that the flexible tube (28) is formed by a rubber cover or the like. Roll according to one of the preceding claims,
characterized in that a flexible layer (18) is applied to the base body (14) at least in the region of the two roller ends, which has a constant radial rigidity over its axial length and has a generally increasing thickness (d) towards the respective roller end. Roll according to claim 9,
characterized in that the thickness (d) of the flexible layer (18) increases towards the respective roller end at least substantially in accordance with the deflection of the base body (14) which results at the maximum winding diameter. Roller according to claim 9 or 10,
characterized in that the base body (14) tapers towards the respective roller end at least substantially in accordance with the increasing thickness (d) of the flexible layer (18). Roll according to one of the preceding claims,
characterized in that the flexible layer (18) is formed by a rubber-elastic layer. Roll according to one of the preceding claims,
characterized in that the flexible layer (18) is formed by an inhomogeneous layer of foamed material and / or a honeycomb structure etc. Roller according to one of the preceding claims,
characterized in that the flexible, preferably rubber-elastic layer (18) provided at least in the region of the two roller ends is provided between the base body (14) and the flexible tube (28) formed in particular by a rubber cover or the like. Roll according to one of the preceding claims,
characterized in that at least in the region of the two roller ends a flexible layer (18) is applied to the base body (14), which has a constant thickness (d) over its axial length and has a generally increasing radial flexibility towards the respective roller end. Roll according to one of the preceding claims,
characterized in that a plurality of flexible elements (20) which are spaced apart from one another in the axial direction are provided and in order to produce the greater radial compliance of the circumferential surface (22) in contact with the web in the region of the two roller ends compared to the central roller region, the mutual spacings of which are selected accordingly and / or whose flexibility is correspondingly different. Roll according to one of the preceding claims,
characterized in that the flexible elements (20) are each at least partially formed by a discrete spring element. Roll according to claim 17,
characterized in that the flexible elements (20) are each at least partially formed by a rubber-elastic annular body. Roll according to claim 17 or 18,
characterized in that the flexible elements (20) are each at least partially formed by a spring assembly extending over the circumference of the base body (14). Roll according to one of the preceding claims,
characterized in that the flexible elements (20) are at least partially biased. Roll according to one of the preceding claims,
characterized in that the base body (14) is provided as a hollow body. Roll according to one of the preceding claims,
characterized in that in the area of the flexible layer (18) applied at least in sections to the base body (14) and / or at least the corresponding flexible element (20) arranged on the base body (14), at least two preferably symmetrically arranged tie rods (34) are attached are. Roller according to claim 22,
characterized in that the tie rods (34) are arranged axially parallel and / or approximately axially parallel to the base body (14). Roller according to claim 22,
characterized in that the tie rods (34) are arranged crossing diagonally or helically to the base body (14). Roller according to one of claims 22 to 24,
characterized in that the tie rods (34) are braced on the end face of the roller (10) by means of at least two outer walls (36). Roller according to claim 25,
characterized in that the tie rods (34) are braced diagonally or at right angles. Roller according to one of claims 22 to 26,
characterized in that the tie rods (34) are held in position in the radial direction of the roller (10) by means of at least one spacer disc (38).

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