DE102009045071A1 - Roller winder roller and method of treating a web - Google Patents

Abstract

Roll winder roller with a roll core which has a functional covering made of an incompressible elastomer radially on the outside and whose boundary layer is defined by at least one opening and at least one web. It is desirable to improve the performance of a roll winder. For this purpose, it is provided that the volume ratio of the at least one opening and the at least one web of the boundary layer is selected in such a way that the boundary layer develops a “quasi-compressible” behavior.

Description

The invention relates to a roller winder roller having a roller core, which has a functional coating of an incompressible elastomer on the radially outside and whose boundary layer is defined by at least one opening and at least one web.

The invention will be described below with reference to a paper web as an example of a material web. However, it is also applicable to other webs that can be handled in a similar manner. As an example of a winding device is used in the sequence of a slitter-winder, to which the invention is applicable with particular advantage.

In order to make the production process of paper production as efficient as possible, efforts are being made to produce paper webs as wide as possible at the highest possible speed.

The resulting paper webs are wound up for further processing or transport on empty reeds and then often called full reels or mother rolls, which currently usually reach axial lengths of up to 11 m, diameter of over 4 m and weights of up to 170 tons. For some finishing processes, but especially for the transport outside the home such large and heavy roles are too unwieldy.

Therefore, they have to be made manageable roles for the transport outside the home and the subsequent processing. This is done in reel winder, in which between the unwinding and winding nor a longitudinal cutting of the web is provided so that several sub-web rolls are wound simultaneously in the reel winder.

In the case of reel winders, a distinction is in principle made between carrier roll winders, in which the roll or rolls rest with their weight on two or more support rolls, and contact roll winders, in which the rolls are held centrically and bear against only one contact roll. In many cases, a part of the roller weight is absorbed by the contact roller. In this case, the contact roller winder is also referred to as a back-up roller winder. In a carrier roll winder, there is often still a loading or rider roll, which presses at the beginning of a winding process, a roll core with a winding roll based thereon with an increased force in the winding bed formed by the support rollers to produce a certain winding tension profile.

Regardless of the type of reel winder you want to achieve the highest possible winding speeds to achieve high productivity. At the same time one would like to achieve a good winding quality and avoid damage to the material web.

It has therefore provided the formerly used reel winding rollers, which were designed as steel rollers, with a functional coating. The functional coating is formed by an elastomer and allows a relation to a steel roller widened bearing or Kontaktnip between the roller winder roller and the winding roll. Roller winder rollers with a functional coating bring improved winding results and make it possible to wind bobbins with a larger diameter than with steel rollers.

However, there are still problems in the operating behavior even with roller winder rollers, which have a functional coating. In the case of functional linings for roll winders, a distinction is fundamentally made between two different types, namely those made of compressible elastomers and those of incompressible elastomers, which in principle have a different effect on the properties of the forming roll. Functional pads made of compressible materials condense as the nip passes. They produce in practice the widest in the direction of travel direction nips, namely up to 55 mm. Functional linings made of incompressible elastomers can only realize nip widths of 35 mm, while even large rolls on steel rolls have barely more than 20 mm nip width. The relatively large Nipbreiten and the much lower modulus of elasticity of the modulus of elasticity of steel allow a much gentler winding process to do than steel rolling. This counteracts in particular the danger of places, crepe creases, bars and markings. Functional pads made of elastomers squeeze off the air flow in the nip against the material web and thus effectively prevent the wrapping of air, which bears against the moving material web, into the forming coil. Thus they prevent a "soft" becoming the roll and lateral trajectory. Thus, roller winder rollers with elastomeric functional coatings also enable higher production or winding speeds. In this discipline too, functional linings made of compressible elastomers achieve higher efficiencies than their incompressible ones Counterparts. However, functional coverings made of compressible materials are only suitable for small to medium finished roll weights. At high loads, compressible functional linings quickly reach their functional limits and then react like a spring compressed on material contact and set the loads rigidly against their counter bearing. The desired effects then remain, but the roll winder roller essentially assumes the properties of a pure steel roll.

In addition, compressible materials, according to the prior art, only in manual manufacturing processes, in particular by strip-like bonding, can be applied to the roll core of a roll winder roller.

Accordingly costly is their production and correspondingly expensive their repair.

On the other hand, functional linings made of incompressible elastomers also offer good support and support ability compared to finished rolls with high weights. They also even cross profile variations of the web to be wound and at the same time reduce the risk of markings, as they work, similar to compressible function pads, with lower contact pressures than roller winders made of steel.

However, they bring a further, not always desirable, unique winding effect with it: the so-called nipinduzierte winding hardness - the winding windings get so with otherwise identical driving data of the winding device by using roller winder rollers with functional coatings of incompressible elastomers higher winding hardness than by roller winders made of steel ,

The invention has for its object to improve the performance of a reel winder.

This object is achieved with a roller winder roller of the type mentioned above in that the ratio of the at least one opening and the at least one web of the boundary layer is chosen such that the boundary layer forms a quasi compressible behavior.

The height of the boundary layer, ie its radial extent, is defined by the distance between the opening bottom and the surface of the functional lining.

The functional coating still retains its support, support, loading or contact function, d. H. with the function coating to reach the desired contact behavior between the forming roll and the roll winder roller. In particular, one achieves an enlarged contact nip compared to a pure steel roller.

The term "quasi-compressible" is intended to express that the boundary layer is much more compressible than the rest of the functional coating. The fact that the remaining functional coating is incompressible, it ensures the necessary winding function and maintains its support or support function.

In this way it is possible to combine the advantages of a compressible functional coating with the advantages of an incompressible functional coating. The advantages of a compressible functional coating are, so to speak, integrated into the basic function of an incompressible functional coating, in which the boundary layer of the incompressible functional coating behaves "quasi-compressibly" under the special load of a forming wound roll due to targeted macrostructural weakening.

Thus, it is possible for the first time, even large and heavy bobbins, preferably with a Rollenenddurchmesser of over 1400 mm, preferably with a Rollenenddurchmesser of about 1650 mm, with high winding speeds, for example with a maximum of 2500 m / min, in particular with a maximum of 2800 m / min, all especially with a maximum of 3100 m / min to wind.

It is preferred that at least 80%, preferably at least 90%, most preferably at least 97% of, under a compressive load of 10 t / m ² to 100 t / m ² , preferably from 20 t / m ² to 80 t / m ² , displaced web material of the at least one opening is receivable.

In this way, it is particularly well possible to form quasi-compressible properties of the boundary layer of the incompressible functional coating.

It is advantageous if at least two openings, preferably 3 to 6 openings, very preferably a plurality of openings are provided.

It is preferred that a plurality of openings are distributed uniformly or non-uniformly over the surface of the functional coating.

In this way, the load distribution on the functional coating is particularly evenly distributed or partially concentrated.

The openings can be introduced, for example, to form a hole or polygon pattern in the surface of the functional coating. In particular, a hole pattern comprises circular or oval openings, which are preferably introduced vertically into the surface of the functional coating. A polygon pattern may preferably be formed by intersecting grooves and form, for example, a diamond pattern on the surface of the functional coating.

It is advantageous if the functional coating consists of a thermosetting elastomer or a thermoplastic elastomer.

Thermosetting resins make up the group with the most incompressible elastomers and offer outstanding technical properties. Even selected thermoplastics offer incompressible properties and, in addition, better processing and processing options.

Furthermore, it is advantageous if the functional coating has a hardness of 20 +/- 5 Pusy & Jones to 60 +/- 5 Pusy & Jones.

In this way, it is ensured that the functional coating forms good load-bearing capacities, but according to the invention, the webs can be displaced into the free volume of the openings in such a way that a quasi-compressible behavior of the boundary layer is formed.

It may be advantageous if the at least one opening has a rectangular cross-section.

Such openings are particularly easy to produce. For example, they are easily and inexpensively introduced into the functional coating by milling or molds. Another advantage is that the free volume of such openings in abrasion of the functional coating, ie reducing the opening depth, is always linearly reduced, which makes the design of the openings particularly simple.

Likewise, it may be advantageous if the at least one opening has a shape deviating from a rectangular cross-section, in particular the shape of an open polygon or an open ellipse.

In this way it is possible to produce a non-linear behavior of the boundary layer under pressure load. The webs of the boundary layer are then either progressively or degressively deformable. Also, the achievable volume flow and the flow of air removal can be influenced by the choice of the opening geometry.

Advantageously, it can be ensured that the at least one opening in the surface of the functional lining forms a helical shape.

In this way, the web roll to be wound, in particular the paper web roll, can be handled particularly gently. A helical opening continuously reciprocates on the surface of the forming web roll during rotation of the reel winder roller over a certain portion corresponding to the pitch of the helical shape. This makes it possible to treat even highly sensitive types of paper perfectly. In particular, winding errors such as placement, crepe wrinkles or bar formation are even better avoidable.

It is advantageous that a plurality of openings are arranged helically next to each other.

In this way, the effects just described are particularly effective to implement.

Preferably, the function coating has a radial thickness in the range of 4 mm to 24 mm, preferably between 5 mm and 20 mm, most preferably from 6 mm to 16 mm.

Since the functional coating of a roller winder roller acts on the material web to be treated under the influence of friction, it is subject to a more or less severe wear due to abrasion. In this case, the reduction of the shell thickness, ie the radial thickness of the functional coating, according to experience is not quite uniform. Again and again in practice, a functional coating is damaged locally by foreign body effects. Uneven wear and such damage make it necessary that the coating must be nachschleifbar to contribute to the economic operation of a reel winder. For this reason, efforts are being made to provide as few millimeters of material as possible for such repair work.

However, as the functional lining thickness increases, the internal forces which the functional coating has to withstand during the winding process also grow.

The specified thickness ranges make good to very good compromises from these requirements.

Advantageously, the opening pitch is between 1.8 mm and 9.2 mm, preferably between 2.5 and 7.0, more preferably between 3.5 mm and 5.5 mm.

Advantageously, the opening width is between 0.5 mm and 2.5 mm, preferably between 0.7 mm and 1.6 mm, very preferably between 0.8 and 1.3 mm.

Advantageously, the opening depth is between 0.7 mm and 5 mm, preferably between 1.0 mm and 3.5 mm, most preferably between 1.3 and 2.8 mm.

If the functional coating has at least one of the aforementioned parameters from the aforementioned value ranges, a quasi-compressible behavior of the boundary layer can be produced particularly well. However, it is preferred that the boundary layer is defined by a feature combination of at least two parameters from the aforementioned 3 claimed parameter ranges.

Under opening pitch is meant the common expansion of an opening and a web in the axial direction of the reel winder roller, opening width only the extent of the opening in the same direction and opening depth whose extent in the radial direction of the reel winder roller.

Finally, it is preferred that the function coating is vulcanized onto the roll core, wound up, shrunk or glued.

In this way, even under economic aspects, a particularly stable connection of the functional coating with the roll core can be achieved. In this case, an adhesion-promoting layer can also be stored temporarily.

The invention will be described below with reference to preferred embodiments in conjunction with the drawings. Herein schematically and not to scale:

1 an illustration of a support roll winding device,

2 an illustration of a backup roll winding device,

3 a detail of a first roller winder roller in longitudinal section,

4 a section of a second roller winder roller in longitudinal section,

5 a section of a third roller winder roller in longitudinal section,

1 shows a carrier roll winder 1 with two support rollers 2 . 3 that together a changing bed 4 form, in which a winding roll 5 lies. Of course, in the changing bed 4 also several bobbins 5 lie next to each other in the axial direction. At least one of the support rollers 2 . 3 is powered. When this carrier roll 2 . 3 turns, then the winding roll 5 rotated by friction and thereby pulls a material web, not shown, for example, a paper web on itself.

To jump out of the winding roll 5 from the winding bed 4 to prevent and to produce a certain winding hardness at the beginning of the winding, is a loading roller 6 above the changing bed 4 intended. The loading roller 6 migrates with increasing diameter of the winding roll 5 up.

Each of the rollers, so the two support rollers 2 . 3 and the load roller 6 , At their periphery may have a function coating, which in connection with the 3 to 5 is discussed in more detail.

2 shows another embodiment of a winding device 7 , which is designed as a so-called back-up roll winder. The winding device 7 has a central roller 8th on, which can also be referred to as a support or contact roller. At the central roller 8th lie winding rolls 9 . 10 on and in the axial direction to each other offset to gap. These bobbins 9 . 10 are kept centric. You can also use a center drive 11 . 12 exhibit. When winding, the bearings along guideways 13 . 14 proceed obliquely upwards. The bobbins 9 . 10 lie in the two upper quadrants at the central roller 8th at.

In such a winding device 7 is the central roller 8th provided with a functional coating associated with the 3 to 5 will be described in more detail.

3 now shows in longitudinal section a section of a roller winder roller 20 , This roller, as mentioned above, one of the two support rollers 2 . 3 , the loading roller 6 or the central roll 8th be.

The roller winder roller 20 has a roll core 15 on, which can also be referred to as a carrier coat. The roll core 15 is for example made of steel or another solid material. The roll core 15 should be designed sufficiently stable to by the adjacent bobbins 5 respectively. 9 . 10 not to be deformed.

On the circumference of the roll core 15 First there is a primer layer 16 which is not necessary in all cases. On the primer layer 16 is a functional coating 17 applied. The functional coating 17 is always made of incompressible elastomer. It can be multi-layered. The individual layers may consist of the same material, but optionally have other hardnesses. It is also conceivable that individual layers, such as by uniform or irregular structuring, are mechanically weakened or stiffened. The functional coating preferably exists 17 however, from a layer of a, largely homogeneous, incompressible elastomer. It is irrelevant whether this elastomer layer has been applied in several steps in the production of the roll winder roller or, for example, has a substantially uniformly distributed reinforcements.

In the present, about 10 mm to 16 mm thick, functional coating 17 For example, from one, on the roll core 15 vulcanized thermoset, is at least one opening 18 introduced, which extends to the outer surface of the functional coating and the bottom thereof 18a the inner edge of a boundary layer 17a Are defined. The at least one opening 18 is defined by the opening width y and the opening depth t. The at least one opening 18 is preferably rectangular. However, it may occasionally be advantageous also from the rectangular shape deviating opening shapes. In particular, polygonal or elliptical openings may also be preferred. A polygonal opening can then be realized for example by a trapezoidal shape, an elliptical shape, for example by a circular shape. It goes without saying that all described opening forms can be opened over more or narrower sections.

The at least one opening 18 is preferably helical in the circumferential surface of the functional coating 17 brought in. In this case, several openings can be arranged side by side, so that the picture of a multi-thread on the surface of the functional coating 17 formed.

If a plurality of openings are provided, these can also be arranged radially, that is to say form a closed circular shape. Such openings may then at regular or irregular intervals from each other in the axial direction over the functional coating 17 be distributed.

In a particularly preferred manner, the functional coating formed from an incompressible elastomer 17 in its outer boundary layer 17a characterized by at least one, preferably a combination of the following parameters: description variable value range tolerance unit slot pitch x 2.0-7.0 +/- 0.2 mm groove width y 0.7-1.6 +/- 0.2 mm groove depth t 1.0-3.5 +/- 0.2 mm reference thickness s 7.0 to 17.0 +/- 0.2 mm reference hardness 20-65 +/- 5.0 Pusy & Jones

In this way, an aperture ratio of up to 80% may result, with an aperture ratio of at least 47% being preferred.

This makes it possible that the under the high surface pressure of a forming finished roller of about 500 kg to now even over 5000 kg weight displaced volume of the incompressible functional coating, more precisely its supporting webs 19 almost completely into the openings 18 can escape. Instead of one, the winding hardness-increasing and the nip forward and / or lagging material bead widened under load only the support surface and thus the effective nip width of a functional coating according to the invention 17 , Roller winder rollers equipped with the functional coating according to the invention are suitable for finished rolls 5 to wrap with previously unknown end diameters and thereby to enable high production speeds, since known winding defects now also in emerging finished rolls 5 Such dimensions can be effectively prevented.

An inventive functional coating 17 may miss, as in 5 represented, also at least one suction opening 21 which is located so as to communicate with a suction port 22 in the roll core corresponds.

LIST OF REFERENCE NUMBERS

1

Carrier roll winder

2

king roll

3

king roll

4

winding bed

5

Winding roller / finished roll

6

loading roll

7

winder

8th

central roll

9

reel

10

reel

11

center drive

12

center drive

13

guideway

14

guideway

15

roll core

16

Adhesive layer

17

function covering

17a

interface

18

opening

18a

opening floor

19

web

20

Rollenwicklerwalze

21

Suction opening in the functional lining

22

Suction opening in the roll core

x, x ₁ ... x _n

port pitch

y, y ₁ ... y _n

opening width

s

Strength of the functional coating

t

opening depth

Claims (15)

Roller winder roller ( 20 ) with a roll core ( 15 ), the radially outside a functional coating ( 17 ) of an incompressible elastomer and its boundary layer ( 17a ) through at least one opening ( 18 ) and at least one bridge ( 19 ), characterized in that the volume ratio of the at least one opening ( 18 ) and the at least one bridge ( 19 ) of the boundary layer ( 17a ) is selected such that the boundary layer ( 17a ) forms a quasi-compressible behavior. Roller winder roller according to claim 1, characterized in that at least 80%, preferably at least 90%, most preferably at least 97% of, under a compressive load of 10 t / m ² to 100 t / m ² , preferably from 20 t / m ² to 80 t / m ² , displaced material of the at least one web ( 19 ) from the at least one opening ( 18 ) is receivable. Roller winder roller according to claim 1 or 2, characterized in that at least two openings, preferably 3 to 6 openings, most preferably a plurality of openings are provided. Roller winder roller according to one of claims 1 to 3, characterized in that a plurality of openings are distributed uniformly or non-uniformly over the surface of the functional coating. Roller winder roller according to one of claims 1 to 4, characterized in that the functional coating consists of a thermosetting elastomer or a thermoplastic elastomer. Roller winder roller according to one of claims 1 to 5, characterized in that the functional coating ( 17 ) has a hardness of 20 +/- 5 Pusy & Jones to 60 +/- 5 Pusy & Jones. Roller winder roller according to one of claims 1 to 6, characterized in that the at least one opening has a rectangular cross-section. Roller winder roller according to one of claims 1 to 6, characterized in that the at least one opening has a, deviating from a rectangular cross-sectional shape, in particular the shape of an open polygon or an open ellipse. Roller winder roller according to one of claims 1 to 8, characterized in that the at least one opening in the surface of the functional coating forms a helical shape. Roller winder roller according to one of claims 1 to 9, characterized in that a plurality of openings are arranged helically next to each other. Roller winder roller according to claim 1 to 10, characterized in that the functional coating ( 17 ) has a radial thickness (s) in the range of 4 mm to 24 mm, preferably between 5 mm and 20 mm, most preferably from 6 mm to 16 mm. Roller winder roller according to claim 1, to 11, characterized in that the opening pitch (x) between 1.8 mm and 9.2 mm, preferably between 2.5 and 7.0, most preferably between 3.5 mm and 5.5 mm is. Roller winder roller according to one of claims 1 to 12, characterized in that opening width (y) between 0.5 mm and 2.5 mm, preferably between 0.7 mm and 1.6 mm, more preferably between 0.8 and 1.3 mm. Roller winder roller according to one of claims 1 to 13, characterized in that the opening depth (t) between 0.7 mm and 5 mm, preferably between 1.0 mm and 3.5 mm, most preferably between 1.3 and 2.8 mm is. Roller winder roller according to one of claims 1 to 14, characterized in that the functional coating ( 17 ) on the roll core ( 15 ) vulcanized, wound, shrunk or glued.

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