EP0728691B1 - Device for winding or unwinding of webs, especially fibrous webs - Google Patents

Abstract

An appts. for winding or unwinding strip fabric esp. fibrous webs comprises a support device with at least two, i.e. first and a second, support rollers arranged such that the roll or reel to be wound forms a pinch point with each of these rollers at least indirectly. The individual elements of the support device are arranged and implemented so that at least one of the pinch points it is made possible for regions of the support elements forming the pinch to deform elastically. The possibilities for deformation are provided at least the second pinch point seen in the direction that the web is wound. Each of the support rollers form a pinch point directly with the reel and at least one roller comprises a support piece an elastically deformable cover with compressible regions. These regions are hollow spaces, e.g. closed drill holes filled with easily compressible material, e.g. synthetic foam, circumferentially running surface grooves possibly at an angle w.r.t. the circumference. The hollow spaces are placed either on the inner cover surface towards the support piece or on the surface in contact with the roll being wound being sealed by a thin cover layer. The support piece is a perforated cylinder and the cover resists circumferential stretching esp. where it contacts the roll. The web partly wraps round the first roller which is set higher w.r.t. the second, i.e. the plane through their axes forms an angle w.r.t. the horizontal.

Description

The invention relates to a device for winding or unwinding web-like material, in particular fibrous webs, in particular with the Features from the preamble of claim 1.

(1) G 91 15 481

(2) G 92 04 667

(3) DE 42 08 790 C2

(4) DE 29 08 294

(5) US 5 240 198 A

(6) DE 87 17 259 U

(7) EP 0 294 546 A

(8) US 5 150 850 A

(9) EP 0 683 125 A

A number of measures are known for increasing the performance of devices for winding web-like material, which are reflected in the following publications:

(1) G 91 15 481

(2) G 92 04 667

(3) DE 42 08 790 C2

(4) DE 29 08 294

(5) US 5 240 198 A

(6) DE 87 17 259 U

(7) EP 0 294 546 A

(8) US 5 150 850 A.

(9) EP 0 683 125 A.

The G 91 15 481 relates to a winding machine for axleless unwinding Train. This has at least one support roller and a device for Relieve one or more carrier rollers of the weight of the windings Role. The relief device comprises a device for applying Compressed air on the outer surface of the roll to be wound, i.e. that of both Carrier rolls are additionally carried by compressed air in Direction of gravity supported. A device designed in this way for or unwinding of web-like material requires appropriate measures for sealing when applying compressed air to the lateral surface of the roll to be wound or unwound. This leads to an increase the design effort, especially in such designs the web feed problematic.

The possibility disclosed in G 92 04 667 consists in lowering the front support roller and installing a rubberized roller as the front support roller.
This has the advantage that the line force on the front carrier roller is larger, but smaller on the rear. The winding roller is then supported more on the front than on the rear carrier roller. This effect increases with increasing roll diameter. As a result, the first press nip in the running direction, which is generally considered to be of greater importance for the winding result, is subjected to less stress, in particular in the case of large roll diameters, than in the case of conventionally designed devices. In order not to have any negative effects from the increasing line force in the second nip, a rubber-coated carrier roller is installed there. This increases the nip width in the second nip. However, tests have shown that a desired increase in performance, in particular an optimal winding result, is not achieved with such a device.

A similar possibility is described in DE 42 08 790 C2. At this the front of the two carrier rollers is also lowered, but instead A rubberized roller, as described in G 92 04 667, is used here Shoe roller used. This comprises a flexible, tubular jacket as well as, for example, a circular cylindrical hollow support, which has support elements for the jacket. The carrier is a themselves over the length of the carrier or essentially over the Carrier width, assigned to the web width, of a tread which is lubricated hydrodynamically, and concave accordingly the maximum winding diameter is formed.

Furthermore, a pressure roller is provided, which enables the Press the winding tube against the load-bearing surfaces. So the shoe roller and thus the carrying shoe the much larger proportion of the winding weight wears, it is necessary that the support shoe on a significantly lower Level is arranged as the top surface line of the rigid support roller.

At the beginning of the winding process, in which only a small winding tube is present, the carrying shoe is in a lower position. With As the winding diameter increases, the carrying shoe becomes more and more pivoted above, so that as with conventional double roller rollers on two elongated areas spaced apart on the circumference of the winding are, this is worn. The disadvantage of such an arrangement is in that the radius of curvature of the support shoe is smaller Diameters of the winding does not correspond, so that none here significant advantage over a conventional double carrier roller consists. However, once the wrap is one size in the area of its maximum Diameter has reached, the wing on which the winding is increased supported on the support shoe 5, significantly. A relief is only found at Reaching a certain, approximately the maximum winding diameter corresponding diameter of the winding roll instead.

Another way to relieve the support rollers when winding a Winding roll is described in DE 29 08 294. The device for Winding of web-like material includes two support rollers endless, elastic tensioned by a movably mounted tension roller Tape to relieve the pressure of the winding roll in the winding gap. The elastic band wraps around one of the two support rollers and the Press roll. The rollers wrapped in the belt are so spatial arranged that during the entire winding process by the elastic band a relief component on the weight of the winding roll arises.

Despite the measures described in documents (2) to (4) could not come close to the performance of slitter rewinder the desired scope can be increased. The negative effects the increasing line force in the second nip could be reduced by the in the Publications (2) to (4) measures described are switched off. Nevertheless, the wound rolls have a number of winding errors on.

US-A-5 240 198 describes a support roller for a winding machine. This has a hard core and a soft cover. The soft cover is with grooves that are open to the outside. This However, the device has not proven itself since it is not an optimal one Provides winding result.

DE-U-87 17 259 discloses an apparatus for winding web-like material. The roller shell is perforated by a surrounding elastic layer. The perforation is vacuumed. Such Suction leads to the creation of a hole pattern in the paper web, which is undesirable.

EP 0 683 125 A2 describes a roll for winding or unwinding paper, with a jacket made of elastic material. The coat has a relatively large size Hardness, which is effectively reduced by a pattern large proportion of gaps is introduced into the surface of the jacket. On this way, on the one hand, a long lifespan due to hard Material and at the same time a large contact area due to the softening realized with gaps.

The object of the invention is therefore to provide a device for or unwinding of web-like material of the type mentioned at the outset, i.e. to develop a double carrier roller, such that the above Disadvantages are avoided. The focus is on achieving one optimal winding result, i.e. the receipt of a winding roll free of beads or similar winding errors.

The achievement of the object is by the characteristic Characterized feature of claim 1. Advantageous designs are in reproduced the subclaims.

According to the invention, in a device for winding or unwinding web-like material, in particular fibrous webs, with at least two Carrier rollers to which the roll to be wound up or unwound can be assigned in such a way that this with the two support rollers each at least indirectly a nip forms, the individual elements of the support device designed in this way and arranged that at least in the area of a nip, preferably the in Direction of winding second nips, alternatives for the in the Nip area elastically deforming areas of each, a nip forming elements provided on the part of the support facility are. This ensures that no shear stresses from the nip-forming elements on the part of the support facility on the ground of elastic deformations are transferred to the winding roll.

The inventors have recognized that the positive effects of Versions according to the status specified in documents (2) to (4) the technology caused by a damaging influence of a soft nip, in particular a soft second nip in the fiber web winding direction can be reduced again. For example, in the executions according to documents (2) and (3) for the front carrier roller used rubber cover compressed in the middle of the nip. analog also applies to an elastic support band according to one embodiment according to the document (4). Since this is for the cover of the carrier roller or material used for the support band, generally rubber, in volume is incompressible, the displaced material must come out of the nip move out. This will mainly be in the machine longitudinal direction do and beads in the area of the inlet and the outlet from the nip form. Because the contact between the winding roll and the rubber cover is not runs smoothly, the stretching of the rubber surface is from the Winding roller hindered. This occurs at the contact surfaces between sheet-like material and rubber have enormous shear stresses that the Stretch the top layers of the sheet-like material on the winding roll.

Improvement measures are therefore in accordance with the invention provided, for example, that in the second nip on the winding roll transferred shear stresses by providing alternative volumes be significantly reduced or avoided entirely. To do this in essentially two solutions that can be combined and can be realized on its own through several modifications can.

1. Die zweite Tragwalze wird mit einem Bezug versehen, welcher Bereiche mit Hohlräumen als Ausweichvolumina für den Bezugswerkstoff aufweist; und

2. Zusätzlich kann die Tragwalze mit einem Bezug versehen werden, der derart ein- oder mehrschichtig aufgebaut ist, daß die Oberschicht besonders dehnsteif in Umfangsrichtung ausgeführt ist.

In a double carrier roller roller, in which, for example, one of the two carrier rollers is wrapped in the fibrous web during operation and the other of the two carrier rollers is lowered relative to the latter, so that a plane through the axes of the two carrier rollers forms an angle with the horizontal, and at The second carrier roller has a jacket that is much more deformable than the jacket of the first carrier roller, there are two options:

1. The second support roller is provided with a cover, which has areas with cavities as escape volumes for the reference material; and

2. In addition, the support roller can be provided with a cover which is constructed in one or more layers in such a way that the top layer is particularly stiff in the circumferential direction.

The first-mentioned cavities can be designed as bores, grooves or the like.
The holes can extend in the form of through holes through the cover and the roller body of the support roller. Blind holes are only provided in the cover.
These can be arranged, for example, in the area of the reference inner surface and the reference outer surface.

The grooves can be circumferential, spiral or in Be arranged inclined to each other extending circumferentially. Also for them Grooving is possible in the area of the outer surface and / or the inner surface of the cover. In the first case, they can can also be closed with a top layer.

The holes, grooves or other cavities are included an easily compressible material, such as foam. This has the advantage of preventing pollution and as little noise as possible. It is also conceivable that Seal cavities with a thin top layer on their surface. This measure can also be combined with the filling of the cavities become.

A second additional option is to use one or more layers constructed cover so that the top layer, which with the Winding roll comes into contact, is particularly stiff in the circumferential direction. This can be done by using multi-layered covers the outer layer is hard and the inner is soft, and that with a multi-layer cover, the inner one Layer is provided with cavities according to the explanations above. It is also conceivable to have a rigid reinforcement in the cover in the area of the Surface, i.e. in the area of the outer circumference of the support roller.

A support roller designed according to the invention with volume-compressible areas can be used in various support roller winding devices.
The individual support rollers can be arranged such that the plane of connection between their two axes forms an angle with the horizontal or coincides with it. Furthermore, in both cases the support rollers can have the same diameter or different diameters. Only one or both carrier rollers can be designed according to the invention. The selection is always made according to the application requirements.

To increase performance, the variants mentioned can also be used with the already known conventional ways to increase performance be combined. This includes the pressure relief, for example the use of a compressed air box assigned to the winding roll and compared to this can be raised and lowered. There is also the possibility the compressed air box with a separator for the web-like material Mistake.

The inventive design and execution of a device for or winding of web-like material enables an increase in performance in that larger diameter rolls without roll defects, such as for example, bursts or crepe folds can be generated, since none disruptive factors occur when winding or unwinding in the nips. The positive effects of those described in documents (2) to (4) Executions can be retained while the negative ones Effects by using appropriately designed support rollers or Support bands can be largely switched off. The basic idea The invention consists essentially in one Double roller roller at least one of the two nips, which the Can form winding roll with the two support rollers, usually the in Direction of winding second nip, as an almost soft nip, in which however no shear stresses are transmitted to the winding roll.

Die Figuren 1a bis 1c

verdeutlichen schematisch erfindungsgemäße Ausführungen eines Tragwalzenbezuges mit Ausweichvolumina anhand einer im Querschnitt dargestellten Tragwalze;

die Figuren 1d bis 1f

verdeutlichen erfindungsgemäße Ausführungen eines Tragwalzenbezuges anhand einer Draufsicht auf eine Tragwalze;

die Figuren 2a und 2b

verdeutlichen die erfindungsgemäße zweischichtige Ausführung eines Tragwalzenbezuges mit in Umfangsrichtung dehnsteifer Oberschicht.

The solution according to the invention is explained below with reference to figures. It also shows the following:

Figures 1a to 1c

illustrate schematically inventive designs of a support roller cover with alternative volumes using a support roller shown in cross section;

Figures 1d to 1f

illustrate embodiments of a support roller cover according to the invention using a plan view of a support roller;

Figures 2a and 2b

illustrate the two-layer design of a support roller cover according to the invention with a top layer which is rigid in the circumferential direction.

Figures 1a to 1c illustrate designs of support rollers with References which volume compressible areas in the form of Have alternative volumes.

A carrier roller 1 is shown schematically in cross section in FIG. 1a. This includes a metallic roll shell 2 and a cover 3. Die Carrier roller is mounted on a frame 4, for example. The reference 3 is executed in one layer and comprises cavities 5. These cavities 5 of through holes through the cover 3 and the metallic Roll shell 2 described. These are preferably at equal intervals arranged in the circumferential direction on the support roller 1. Furthermore you can these cavities in certain, according to the application requirements defined distances across the support roller width. The Bores preferably have a circular cross section.

FIG. 1b illustrates a support roller provided with a cover, which Has cavities in the form of blind holes. The basic structure corresponds that described in Figure 1a. For the same elements, therefore, the same Reference numbers used.

The support roller 1 also has a metallic roller shell 2 here. The Cover 3 is also preferably of a single layer here and has in Area of its outer circumference 6, which is the outer circumference of the support roller 1 with the cover drawn corresponds to that protruding into the cover 3 Blind holes 7 on. These are also certain, according to the Use requirements predetermined distances l in the circumferential direction arranged to each other; The same applies to the arrangement of the blind holes across the support roller width.

Figure 1c illustrates an embodiment of a support roller with cavities in the cover, which are closed by a thin cover layer on the surface. The design corresponds essentially to that described in Figure 1b, which is why the same reference numerals have been used for the same elements. However, the cover 3 comprises, in addition to at least one single or multi-layer base layer 9, a radially outer cover layer 11. This should be made much harder than the radially inner part of the cover. As shown in the figure, the cover layer may not be perforated or may be perforated for the purpose of noise reduction.
The main advantage of the cover layer, which essentially serves to cover the cavities 7, is a reduction in noise.

The embodiments shown in FIGS. 1a and 1b show one layer designed roller covers. However, there is no one here either shown possibility of using a multi-layer design Cover. In analogy, this statement also applies to the one disclosed in FIG. 1c Execution. In addition to the top layer, the cover can also be a have a multilayer base layer.

1d to 1f illustrate schematically designs of a support roller cover in a top view of a support roller designed according to the invention. For the purpose of illustration, the cavities shown are not shown to scale.
FIG. 1d shows circumferential grooves marked with 12. In FIG. 1e, grooves 13 running spirally with respect to one another and in FIG. 1f oblique, intersecting grooves 14 and 15 are shown.
The grooves 12 to 15 can be arranged in a single or multi-layer base layer and can also be covered by a cover layer.

To reduce the noise, the versatile are designed Cavities with an easily compressible material, for example Foam filled and possibly also with a top layer locked.

Another design option is shown in Figures 2a and 2b. Here too, a support roller 1 comprises one, preferably a metallic one Roll shell 2 and a cover 3. The cover 3 comprises a base layer 9 and a cover layer 11. The base layer 9 is made of a softer one Material produced as the cover layer 11. In the cover layer 11 are in Circumferential direction rigid reinforcements 17 in the form of wrapped Circumferential threads are provided.

FIG. 2b shows an enlarged section from the reference 3 according to FIG Figure 2a. The cover layer 11 can be made of an elastomeric material be, for example polyurethane. In the top layer are essentially in Threads 17 running in the circumferential direction are incorporated. The design and Production of such a cover can be done according to DE 40 22 800 C1.

Claims (8)

1. An apparatus for winding up or winding off a web-like material, especially fiber webs;

   1.1 with a support device, comprising at least two supporting rollers, namely a first supporting roller (1) and a second supporting roller;

   1.2 with the roller to be wound up or off (lap roll) being assignable to the two supporting rollers in such a way that it forms at least indirectly a pressing gap each with the two supporting rollers;

   1.3 with at least one (1) of the supporting rollers comprising a supporting body as well as a cover made of a relatively soft, rubber-elastic material made of polyurethane for example;

   1.4 with the cover being provided with recesses (5, 7; 12 to 15);

   1.5 with the recesses (5, 7; 12 to 15) being open towards the circumferential surface of the cover (3);

   1.6 with the recesses (7, 12 to 15) being filled with an easily compressible material.
2. An apparatus as claimed in claim 1, characterized in that the recesses (5, 7; 12 to 15) are configured as uncovered blind bores.
3. An apparatus as claimed in claim 1, characterized in that the recesses are grooves (12) extending in the circumferential direction.
4. An apparatus as claimed in claim 1 or 3, characterized in that the recesses are arranged as grooves (13 to 15) which extend inclined relative to the direction of running or circumference.
5. An apparatus as claimed in one of the claims 1 to 4, characterized in that the recesses (7, 12 to 15) are filled with foam.
6. An apparatus as claimed in one of the claims 1 to 5, characterized in that a non-extensible armoring (17) is embedded in the cover in the region of the surface.
7. An apparatus as claimed in one of the claims 1 to 6, characterized in that the cover is provided in the circumferential direction with a non-extensible configuration.
8. An apparatus as claimed in one of the claims 1 to 7, characterized by the following features:

   8.1 when seen in the winding direction, the first of the two supporting rollers is at least partly wrapped around by the web-like material during operation;

   8.2 the second supporting roller is lowered with respect to the first supporting roller in such a way that a plane placed through the axes of the two supporting rollers forms an angle with the horizontal line.

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