EP1310445B1 - Roller for winding a material web, method for the production of a roller and method for improvement of the winding quality - Google Patents

Abstract

A roller (1) comprises a base member (4) with bearing pins (5) at each end, and a circumferential surface (10). The base member has a smaller diameter at the ends than in the middle, and the roller has a thin walled tubular sleeve. The sleeve is fixed to the base member. The roller has a filler material and/or coating made of a flexible material, eg polyurethane.

Description

The invention relates to a winding core for the continuous winding of a material web with a base body, each having a mounted on its two end faces bearing pin, and with a web-contacting peripheral surface.
The invention further relates to a method for improving the winding quality of a continuously wound on a winding core material web, in particular a paper or board web.

A winding core, for example a spool for use in a winding machine or a winding tube for use in a slitter-winder, is disclosed in German Utility Model DE 296 12 786 U1. This winding core preferably consists of a hollow cylindrical winding core body and one mounted at its two ends bearing journals, with which it rests during use in bearings, which are usually supported movably on, for example, horizontal rails.

The winding process has a very great importance both in web production and in the material web finishing, because sometimes there is a risk that a previously produced material web during winding is adversely affected by winding defects that parts of a manufactured winding roll are not for sale. Among the well-known winding defects include the so-called shiny spots, wrinkles or Platzer. The resulting winding defects are generally greater, the faster the winding machines are operated (order of magnitude 1,500 to 2,500 m / min) and the larger the diameter produced (order of 2.5 to 4.5 m) and finished weights (order of magnitude up to 135 t) Winder rolls ("finished reels") are.

There are a number of theories for the formation of, for example, glossy spots, the most widespread of which is the following: When the web of material is wound on a winding core and the resulting winding roll gradually reaches its finished diameter, the high weight forces cause a deflection of the winding core the ultimately relative shifts of individual material web layers (axial displacements), in particular in the edge regions, causes each other. In other words: adjacent material web layers glide on each other due to acting shear stresses under friction, so that ultimately undesirable gloss spots appear.
The deflection of the winding core thus represents the actual dimensioning criterion for such Wickerlkerne, which means that wall thickness and diameter and thus weight and cost of each winding core are determined by the maximum allowable deflection.

• sie entstehen hauptsächlich in einem Schwartenbereich von bis zu 150 mm, gelegentlich auch in einem größeren Schwartenbereich von bis zu 300 mm;
• sie treten bei einem Wickelrollendurchmesser meist von größer 2,5 m auf und werden mit zunehmendem Wickelrollendurchmesser gravierender;
• sie treten im wesentlichen im Randbereich zwischen 0,5 und 1,5 m auf;
• sie können sich manchmal nur über wenige Materialbahnlagen (circa 10 Materialbahnlagen) erstrecken;
• sie treten bei gestrichenen Papiersorten auf, sind aber meist nur bei den sogenannten Mattsorten störend.

The appearance of Glanzstellen is versatile:

• They occur mainly in a rind area of up to 150 mm, occasionally in a larger rind area of up to 300 mm;
• they usually occur with a winding roll diameter of more than 2.5 m and become more serious with increasing winding roll diameter;
• they occur essentially in the edge region between 0.5 and 1.5 m;
• sometimes they can only extend over a few material web layers (about 10 material web layers);
• They occur in coated paper grades, but are usually disturbing only in the so-called mats.

With regard to the avoidance of the emergence of highlights, various efforts have been made in the past, which in the end remained without the hoped-for success.

For example, the winding roll was deliberately wrapped with a softening point (hanging edges) in the area of the possible highlights, or the winding roll was wound harder in the core (hanging edges), causing problems with the flatness of the material web.

Furthermore, the winding core, as disclosed, for example, in German Offenlegungsschrift DE 199 44 703 A1, was provided with various crowns. For example, although there were no glossy spots with a 2.4 mm crown, wrinkles formed in the core of the wound roll, and glosses of 1.1 mm could not be safely avoided, and problems of coiling occurred. The control of the profiles also contributed to no problem solution: A normal profile (hanging edges) resulted in a lower winding hardness at the edge, a flat profile produced by calender and / or line, slightly reduced the risk of the emergence of highlights.

German Utility Model DE 296 22 141 U1 moreover discloses providing a winding core with a carrier device arranged in its interior, which comprises a supporting device which supports the winding core shell rotating about an axis.

A disadvantage of this winding core is that the built-in support device causes not inconsiderable additional costs in the purchase, and this in the fact that 15 to 25 hubs are usually in use on a paper or board machine.

Finally, from European Patent EP 0 500 515 B1 (DE 692 19 923 T2) a winding core winding a material web is known, which consists of an outer and an inner shell, the outer shell with the aid of rolling bearings, plain bearings or torsionally rigid devices existing and fixedly mounted articulated connection devices is supported on the inner shell.
This winding core has the disadvantage that it is structurally designed for an application with certain parameters and it brings only a problem solvable when changing only one parameter, for example, the basis weight of the material web.

The publication US 2001/0008863 A1 discloses a removal, spreading or guide roller for a material web. It has a base body, each having a mounted on its two end faces bearing pin, and a web-contacted peripheral surface. The main body has in each case in the region of its two base body ends a smaller basic body diameter than in the region of the main body center with a basic body center diameter. Furthermore, the disclosed extraction, spreading or guide roller for a material web in the region of its two roll ends each with a coaxially aligned to the main body and thin-walled tube sleeve, which in the outer, directed to the respective bearing journal area flying and in the interior, directed towards the roll center Area is fixed by means of joints on the body, provided to form a ring-like gap.

As a summary of these various efforts can be stated: The risk of winding defects, in particular glosses, when winding webs of material on a winding core could hardly or only insignificantly reduced or a significant reduction could only at disproportionately high costs for the winding core, at changed market conditions can no longer be achieved.

It is therefore an object of the invention to provide an improved, more cost-effective and preferably retrofittable winding core of the type mentioned, in which the deflection of the winding core surface line is reduced accordingly ("leveled bending line").
Furthermore, the object of the invention is a Method for improving the winding quality of a continuously wound on a winding core material web, in particular a paper or board web to specify.

This object is achieved in a winding core of the type mentioned according to the invention that the main body in the region of its two body ends each have a smaller Grundkörperenddurchmesser than in the region of the body center with a Grundkörpermittendurchmesser, and that the winding core in the region of a two winding core ends each with a body coaxially oriented and preferably thin-walled tubular sleeve which is fixed in the outer, directed to the respective bearing journal area and the fixed in the inner, center of the winding towards the region is rigidly secured to the body, is provided with a respective Rohrhülsenaußeudurchmesser forming a ring-like gap.
Due to this constructive design of the winding core, the deflection of the winding core surface line is at least so far reduced that larger edge inclinations are excluded, which also leads to high-gloss layer displacements in the winding be avoided even with larger winding diameters ("leveled bending line").
Also existing hubs can be easily adapted accordingly, so that a new production of the same is not required. Furthermore, due to the small change in weight and no adjustment of the lifting, transport and drive devices required.

With regard to the structural design of the winding core according to the invention, there are other various design options: the two respective outer tube diameter are larger than the main body center diameter, between the two tube sleeves an intermediate region is present, with at least one filler in order to obtain a constant winding core diameter is provided for the web-contacting peripheral surface, or the two respective outer tube sleeve diameter and the body center diameter are the same so that they form a constant outer core diameter for the web-contacted peripheral surface, wherein the outer peripheral surface of the respective tube sleeve and the outer peripheral surface of the body center may be provided with a coating.

With regard to the maximum occurring deflection, it is sufficient if the respective annular intermediate space formed between the respective base body end and the respective tube sleeve has a ring thickness of 5 mm to 20 mm, preferably 8 mm to 15 mm.

The respective base end has a respective axial length in the range of 15% to 45%, preferably in the range of 20% to 35%, of the length (L _W ) of the winding core. This respective axial length is perfectly sufficient to reduce the respective edge slopes accordingly.

Under aspects of strength engineering, the respective tube sleeve has a wall thickness of 10 mm to 25 mm, preferably 12 mm to 20 mm, with a preferably constant or approximately constant wall thickness in the axial direction.

In order to achieve only lesser additional costs for the winding core, the respective pipe sleeve is preferably fixed by means of at least one single-layer weld to the body center.

The respective tube sleeve is preferably made of steel and / or a plastic and / or a combination of materials, wherein the plastic reinforcements of fibers, fabrics or the like contains and the degree of reinforcement preferably decreases to the outer, directed to the respective bearing journal area. These materials have already proven themselves several times in practice and are also still inexpensive in terms of their acquisition and processing costs.

The respective tube sleeve is mounted with an axial overlap region of 100 mm to 500 mm, preferably from 200 mm to 400 mm, at the center of the body.

In order for the respective tube sleeve to gain further guidance and support, it is additionally radially guided in the overlap region in an axial range of 25 mm to 150 mm, preferably 30 mm to 100 mm, preferably by at least one shrink fit, wherein the shrink fit is preferably is mounted in the area facing away from the weld area of the overlap region.

Preferably, at least one relief relief cut, preferably a relief groove, is provided in the region of the overlapping region facing the weld.

Furthermore, the coating and / or the filler is made of a flexible material and has a hardness in the range from 20 P & J to 100 P & J, preferably from 25 P & J to 50 P & J. The coating and / or the filler may in particular consist of polyurethane (PU) or of a substance with similar properties.

With regard to a weight-minimized embodiment of the winding core is provided that the main body of the winding core is formed as a hollow body, and this with at least sufficient fulfillment of all strength engineering and process engineering requirements of the winding core.

Moreover, the web-contacting peripheral surface is formed by the two outer peripheral surfaces of the two tube sleeves and the outer peripheral surface of the filler introduced in the intermediate region or by the two outer peripheral surfaces of the two tube sleeves and the outer peripheral surface of the body center or by the coating on the outer peripheral surface of the respective tube sleeve and the outer peripheral surface of the body center is applied, is formed. These embodiments of the winding core resulted inter alia in a homogenization of the web-contacting peripheral surface.

The procedural object is achieved by using a winding core according to the present invention.
In addition, there is the advantage that even existing hubs can be easily adapted accordingly, so that a new production of the same is not required. Furthermore, due to the small change in weight and no adjustment of the lifting, transport and drive devices required.

Further features and advantages of the invention will become apparent from the dependent claims and the following description of preferred embodiments with reference to the drawings.

Figur 1:

eine schematisierte Ansicht eines Wickelkerns zum Aufwickeln einer Materialbahn; und

Figur 2:

einen schematisierten Teilschnitt eines erfindungsgemäßen Wickelkerns.

Show it

FIG. 1:

a schematic view of a winding core for winding a material web; and

FIG. 2:

a schematic partial section of a winding core according to the invention.

The illustrated in Figure 1 in a schematic form and well-known hub 1 consists of a preferably hollow cylindrical core 2 and wound thereon, only sketchy and partially illustrated material web layers 3a, preferably paper or board web layers, a web 3, preferably a paper or board web. The winding core 1 consists of a winding core body (base body) 4 and attached to its two end faces 4.3, only sketchy and partially illustrated bearing pin 5. In a known embodiment of the winding core body 4 consists of a metallic material, such as steel; However, it is also the use of fiber composites alone or in combination with other materials, such as steel conceivable. The winding core 1 can also, as in the already cited German Utility Model DE 296 12 786 U1, be executed: winding core 4 and a jacket whose surface having reference with high compliance, for example made of rubber or of a rubber-elastic plastic.
Under the effect of the weights and contact forces received by the two bearing journals 5 (total forces F _G (arrow)), the winding core 1 and the core 2 bend slightly during operation by a deflection D. This deviating from the ideal line position of the winding core 1 is indicated in the figure 1 in dotted lines.

2 shows a schematic partial section of a winding core according to the invention, wherein only the upper left half of a winding core end of the symmetrically constructed winding core is shown. With regard to the general description of Figure 2 reference is made to that of Figure 1.
According to the invention, it is now provided that the base body 4 in the region of its two base body ends 4.1 each have a smaller basic body diameter D _GE than in the region of the base body 4.2 having a basic body center diameter D _GM , that of the winding core 1 in the region of its two Winding core ends 1.1 each coaxially aligned with a base body 4 and preferably thin-walled tube sleeve 6, which in the outer, to the respective bearing pin not shown directed area 6.1 flying and in the inner, to the core center 1.2 directed towards area 6.2 is preferably rigidly attached to the base body 4 , Is provided to form a ring-like gap 7.
In the figure 1 it can be clearly seen that the two respective outer tube diameter D _{RA are} greater than the main body center diameter D _GM , between the two tube sleeves 6, an intermediate region 8 is present, with at least one filler 9.1 in order to obtain a constant outer diameter Umwickeldurchmessers D _W for the Track contacted peripheral surface 10 is provided. Alternatively, but not explicitly shown, the two other design possibilities of the mold are that the two respective outer tube diameter D _RA and the body center diameter D _{GM are} equal to form a constant outer diameter of the outer diameter D _W for the web-contacting peripheral surface (10) Outer peripheral surface 6.3 of the respective pipe sleeve 6 and the outer peripheral surface 4.4 of the body center 4.2 may be provided with a coating 9.2 (dashed line).
The respective tube sleeve 6 has a preferably cylindrical outer peripheral surface; However, it can also be conical or executed in another convenient contour.
Furthermore, the respective annular intermediate space 7 formed between the respective base end 4.1 and the respective tube sleeve 6 has a ring thickness RS of 5 mm to 20 mm, preferably 8 mm to 15 mm, and the respective base end 4.1 has a respective axial length L _GE in _FIG Range of 15% to 45%, preferably in the range of 20% to 35%, the length L _W (arrow, Figure 1) of the winding core 1 on.
Further, the respective tube sleeve 6 has a wall thickness WS of 10 mm to 25 mm, preferably from 12 mm to 20 mm, wherein the respective tube sleeve in particular a preferably constant or approximately constant wall thickness WS in the axial direction AR (arrow).
The respective tube sleeve 6 is preferably fixed by means of at least one single-layer weld 11 to the body center 4.2 and the respective tube sleeve 6 is preferably made of steel and / or plastic and / or a combination of materials, wherein the plastic in a special embodiment reinforcements made of fibers, fabrics or the like. In the case of a reinforced plastic, the degree of reinforcement preferably decreases to the outer, directed to the respective bearing pin, not shown, from area. Such a structure of the respective plastic tube sleeve, including any named reinforcements, is subject to the expertise of a person skilled in the art.
Also, the respective tube sleeve 6 with an axial overlap area B _Ü of 100 mm to 500 mm, preferably from 200 mm to 400 mm, attached to the body center 4.2, wherein they additionally in the overlap area B _Ü in an axial range B _S of 25 mm 150 mm, preferably from 30 mm to 100 mm, preferably by at least one shrink fit 13 is guided radially. The shrink fit 13 is preferably in the side remote from the weld area 11 of the overlap region B _Ü and at least one relief cut-out 12.1, preferably a relief groove 12.2 is in the weld 11 facing the area of the overlapping area B _Ü mounted.
The filler 9.1 and / or the coating 9.2 consists in particular of a flexible material 14 and has a hardness H _F in the range of 20 P & J to 100 P & J, preferably from 25 P & J to 50 P & J. According to the invention, the filler 9.1 and / or the coating 9.2 consists of polyurethane (PU) 15 or of a substance with similar properties.
Furthermore, the base body 4 is formed as a hollow body 16 and the web-contacted peripheral surface 10 is formed by the two outer peripheral surfaces 6.3 of the two tube sleeves 6 and the outer peripheral surface 8.1 of the introduced in the intermediate region 8 filler 9.2. Alternatively, but not explicitly shown, can the web-contacting peripheral surface 10 by the two outer peripheral surfaces 6.3 of the two tube sleeves 6 and the outer peripheral surface 4.4 of the body center 4.2 or by the coating 9.2, which may be applied to the outer peripheral surface 6.3 of the respective tube sleeve 6 and the outer peripheral surface 4.4 of the body center 4.2, may be formed ,

The winding core 1 according to the invention is also outstandingly suitable for improving the winding quality of a material web 3 wound on it continuously, in particular a paper or board web.

It goes without saying that the winding core according to the invention can have further structural properties, without departing from the scope of the disclosure of the present description including figures. Thus, for example, the tube sleeve can be configured with varying inner diameters for the purpose of possible formation of at least one positive stop. Accordingly, it may be possible to deviate from the mentioned preferred constancy of the axial wall thickness.

In summary, it should be noted that the invention provides an improved, less expensive and preferably retrofittable winding core of the type mentioned, in which the deflection of the winding core surface line is reduced accordingly.

LIST OF REFERENCE NUMBERS

1

winding core

1.1

Winding core end

1.2

Winding core center

2

core

3

web

3a

Web location

4

Winding core body (basic body)

4.1

Body end

4.2

Basic midsection

4.3

front

4.4

Outer circumferential surface (body center)

5

pivot

6

tubular sleeve

6.1

Area (end area)

6.2

Area (middle area)

6.3

Outer peripheral surface (tube sleeve)

7

gap

8th

intermediate area

8.1

Outer peripheral surface (intermediate region)

9.1

filler

9.2

coating

10

Track-contacting peripheral surface

11

welding

12

Relief cutout

12.1

relief groove

13

shrink fit

14

Flexible material

15

Polyurethane (PU)

16

hollow body

AR

Axial direction (arrow)

B _s

Area (shrink fit)

B _Ü

overlap area

D

deflection

D _GE

Grundkörperenddurchmesser

_GM

Body center diameter

D _RA

Tubular sleeve outer diameter

D _W

Hub outer diameter

F _G

Total forces (arrow)

H _F

Hardness (filler / coating)

L _G

Length (winding core)

L _GE

Length (body end)

L _W

Length (winding core)

RS

ring thickness

WS

Wall thickness (tubular sleeve)

Claims (21)

1. Winding core (1) for the continuous winding of a material web (3), having a base body (4) which has bearing journals (5) in each case fitted at its two ends (4.3), and having a circumferential surface (10) that touches the web, characterized in that, in the region of its two base body ends (4.1), the base body (4) in each case has a smaller base body end diameter (D_GE) than in the region of the base body centre (4.2) having a base body centre diameter (D_GM), and
   in that, in the region of its two winding core ends (1.1), the winding core (1) is in each case provided with a tubular sleeve (6) which is aligned coaxially with the base body (4) and has a thin wall, is fixed in a cantilevered manner in the outer region (6.1) oriented towards the respective bearing journal (5) and is fixed rigidly to the base body (4) in the inner region (6.2) oriented towards the winding core centre (1.2), with a respective tubular sleeve outer diameter (D_RA) forming an annular interspace (7).
2. Winding core (1) according to Claim 1, characterized in that the two respective tubular sleeve outer diameters (D_RA) are greater than the base body centre diameter (D_GM), there being between the two tubular sleeves (6) an intermediate region (8) which is provided with at least one filler (9.1) for the purpose of obtaining a constant winding core outside diameter (D_W) for the circumferential surface (10) that touches the web.
3. Winding core (1) according to Claim 1, characterized in that the two respective tubular sleeve outer diameters (D_RA) and the base body centre diameter (D_GM) are equal, in order that they form a constant winding core outer diameter (D_W) for the circumferential surface (10) that touches the web.
4. Winding core (1) according to Claim 3, characterized in that the outer circumferential surface (6.3) of the respective tubular sleeve (6) and the outer circumferential surface (4.4) of the base body centre (4.2) are provided with a coating (9.2).
5. Winding core (1) according to one of the preceding claims, characterized in that the respective annular interspace (7) formed between the respective base body end (4.1) and the respective tubular sleeve (6) has an annular thickness (RS) of 5 mm to 20 mm, preferably of 8 mm to 15 mm.
6. Winding core (1) according to one of the preceding claims, characterized in that the respective base body end (4.1) has a respective axial length (L_GE) in the range from 15% to 45%, preferably in the range from 20% to 35%, of the length (L_W) of the winding core (1).
7. Winding core (1) according to one of the preceding claims, characterized in that the respective tubular sleeve (6) has a wall thickness (WS) of 10 mm to 25 mm, preferably of 12 mm to 20 mm.
8. Winding core (1) according to Claim 7, characterized in that the respective tubular sleeve (6) has a preferably constant or approximately constant wall thickness (WS) in the axial direction (AR) (arrow).
9. Winding core (1) according to one of the preceding claims, characterized in that the respective tubular sleeve (6) is fixed rigidly to the base body centre (4.2) by means of at least one single-layer weld (11).
10. Winding core (1) according to one of the preceding claims, characterized in that the respective tubular sleeve (6) consists of steel and/or plastic and/or of a material combination.
11. Winding core (1) according to Claim 10, characterized in that the plastic contains reinforcements of fibres, woven fabrics or the like.
12. Winding core (1) according to Claim 11, characterized in that the level of reinforcement decreases towards the outer region (6.1) oriented towards the respective bearing journal (5).
13. Winding core (1) according to one of the preceding claims, characterized in that the respective tubular sleeve (6) is fitted to the base body centre (4.2) with an axial overlap region (B_Ü) of 100 mm to 500 mm, preferably of 200 mm to 400 mm.
14. Winding core (1) according to Claim 13, characterized in that, in the overlap region (B_Ü), the respective tubular sleeve (6) is preferably additionally guided by means of at least one shrunk fit (13) in an axial region (B_S) of 25 mm to 150 mm, preferably of 30 mm to 100 mm.
15. Winding core (1) according to Claim 14, characterized in that the shrunk fit (13) is fitted in the area of the overlap region (B_Ü) facing away from the weld (11).
16. Winding core (1) according to Claim 14 or 15, characterized in that at least one relief clearance (12.1), preferably a relief groove (12.2) is made in the region of the overlap region (B_Ü) facing the weld (11).
17. Winding core (1) according to one of the preceding claims, characterized in that the filler (9.1) and/or the coating (9.2) consists of a flexible material (14) and has a hardness (H_F) in the range from 20 P&J to 100 P&J, preferably of 25 P&J to 50 P&J.
18. Winding core (1) according to Claim 17, characterized in that the filler (9.1) and/or the coating (9.2) consists of polyurethane (PU) (15) or of a material with similar properties.
19. Winding core (1) according to one of the preceding claims, characterized in that the base body (4) is formed as a hollow body (16).
20. Winding core (1) according to one of the preceding claims, characterized in that the circumferential surface (10) that touches the web is formed by the two outer circumferential surfaces (6.3) of the two tubular sleeves (6) and the outer circumferential surface (8.1) of the filler (9.1) introduced in the intermediate region (8), or by the two outer circumferential surfaces (6.3) of the two tubular sleeves (6) and the outer circumferential surface (4.4) of the base body centre (4.2), or by the coating (9.2) which is applied to the outer circumferential surface (6.3) of the respective tubular sleeve (6) and the outer circumferential surface (4.4) of the base body centre (4.2).
21. Method for improving the winding quality of a material web (3) wound continuously on a winding core (1), the winding core (1) consisting of a base body (4) which has a bearing journal (5) in each case fitted at its two ends (4.3), and having a circumferential surface (10) that touches the web, characterized in that a winding core (1) according to at least one of Claims 1 to 20 is used.

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