EP1122199B1 - Roll winder drum and method for it's manufacturing - Google Patents

Description

The invention relates to a roll winder roller with a Surface at the periphery and openings in the surface, the channels passing through the surface Air intake volumes are related. Furthermore concerns the invention a method for producing a Roll winder roll, in which the roll winder roll with Openings and adjoining channels in their peripheral surface is provided.

Such a roll winder roller is from the post-published German patent application 198 12 723 known.

DE 21 48 361 A describes a roller, in particular for Machines of the paper industry in which a roller body straight, essentially circumferential and the first standing upright in the radial direction Bands is formed by corrugated in the circumferential direction and also standing upright in the radial direction second bands are connected together. On this A roll fabric is applied to the roller body. The The roller is used in particular as a dough roller.

Patent Abstracts of Japan, Vol. 013, 065 (JP 63-267648 A) shows a suction roller for transporting films, the one with a jacket made of an air-permeable material is provided. The coat is over suction openings guided. Where the openings are, a film is held on the peripheral surface.

WO 98/08765 A1 shows a web guide roller for a Material web with a substantially cylindrical, thin-walled hollow body with side surfaces and fine, through openings on the peripheral surface. By a vacuum or compressed air supply to the interior of the roller can, for example, rotate without slip Guide rollers for webs can be realized.

DE 295 03 003 U1 describes a web guide roller for a web, in particular a film web, which as Vacuum roller arrangement is formed and a slotted screen hollow cylinder has as a roller body. The roller body is closed at the front with steel washers. There is one in at least one end plate Intake manifold arranged. The roller shell has openings on that can be vacuumed.

EP 0 376 127 A2 shows a vacuum roller with drilled holes Openings in the outer surface. The outer surface is in a top layer worked out on a roller body rests. In the surface of the roller body axial and circumferential grooves are provided, which with the openings in the lateral surface are connected.

US 5 232 141 A describes a suction roll with a body made of sintered material, sucked through can be made to be on the surface of the to hold sintered material on the material web.

DE 296 15 385 U1 describes a roller for a winding machine with an elastic layer in the surface Grooves are arranged, which should ensure that air adhering to a web is removed.

The invention is based on a double carrier roller winder with such a roll winder roller described. But it is also with other roll winders usable where similar requirements consist. Furthermore, the invention using the example of Winding a paper web into a paper web roll described. The problems that arise from this arise but also when winding other material webs.

Paper webs are produced almost "endlessly". You need to hence, in order to be handled, to winding rolls be wound up. Here, the winding roll lie in a changing bed by two carrier rollers is formed. The paper web is fed so that it partially wraps around one of the two support rollers. Here you want to achieve that the paper web as possible lies close to the surface of the carrier roller. So you can fix the paper web on the Reach the support roller and prevent it from running sideways.

With increasing web speed, however, always more air is drawn in between the paper web and the roller surface. This air causes the paper web to float and thus increases the risk of lateral Bleed. In addition, it is then only conditional possible, a drive power on the support roller to transfer the paper web or an interruption in the web train to effect. One has therefore in the above mentioned German patent application 198 12 723 air intake volumes provided in the roller over channels with openings on the surface of the roller stand. The air adhering to the paper web can then temporarily escape into the air intake volumes. This leads to a slight increase in pressure there, is otherwise not critical. The air intake volumes are completed at least in the circumferential direction, so that a compressed air support for the paper roll in the changing bed can realize. The there under increased Air present cannot pass through the Escape the roller.

However, the manufacture of such a roll winder roller relatively complex.

The invention has for its object the manufacture to simplify.

This task is the in a roll winder roller type mentioned solved in that the air intake volumes are arranged in a porous layer.

This means that the layer is a predetermined one Has air absorption capacity. Materials like that are trained, can be relative in many cases easy to handle so that the manufacture of the roll winder roller with a relatively small amount of handling can be done. If editing such Layer is necessary, this is usually also associated with relatively little effort, because a porous material in a machining tool usually opposes less resistance than a solid material. The porous material is under Under certain circumstances so permeable to air that when stationary Roll compressed air from the changing bed through the porous one Step through the layer and exit through openings could be placed outside of the changing bed and are not covered by the paper web. Since the Roller winder roller in operation but turns, this is Problem largely theoretical. The porous Layer sets such an air flow sufficient resistance so that the corresponding Roll sections with increased air pressure have already been applied to the changing bed again have left before the compressed air comes out elsewhere could. The porous layer therefore has an adequate one Throttle assets.

The porous layer is preferably at its radial Provide an airtight cover on the inside. This prevents the compressed air from becoming radial can pass through the porous layer. Pressure losses in This keeps the changing bed small.

The air intake volumes are preferably marked by Cavities are formed in the porous layer. you can then also use materials for the porous layer, which in itself has a low air absorption capacity or have less porosity. In this case becomes the largest part of those adhering to the paper web Air is taken up and guided in the respective cavities there to a slight increase in pressure. You could in extreme cases even materials for the porous layer use, where the air absorption capacity it is realized that the material on the boundary wall the cavities are elastically deformed.

The cavities are preferably designed as hollow cylinders, whose diameter is larger than the diameter the channels is. Such cavities can be easily manufacture, for example by drilling or by punching. Because the diameter of the hollow cylinder is larger than the diameter of the channels is sufficient Volume available, and the orientation of the Cavities to the channels become easier.

In a preferred embodiment it is provided that the porous layer radially within a load-bearing Roll shell is arranged. The roller shell takes over then the function, the paper web and the paper roll mechanically supported. The porous layer takes over then the function, the corresponding air intake volumes provide. In this case, a porous layer with a relatively low strength use.

The porous layer is preferably made of a cylindrical shape curved mat formed under internal stress rests radially on the inside of the roll shell. This simplifies it the production. You can spread out the mat Edit condition if necessary. Then the mat is simply rolled up in a cylindrical shape and inserted into the roll shell. There would like to unroll it again, but is Roller jacket prevented. So the mat is with sufficient security attached with roller jacket. An additional adhesive connection is possible, however not absolutely necessary in all cases.

The porous layer is preferably foamed or lattice-like material. such Materials are in the form of foams or sintered or ceramic materials as semi-finished products.

The task is also through a procedure of the beginning mentioned type solved, in which a mat from a bendable material with a predetermined air absorption capacity bent into a cylinder and into one a cavity formed cavity is used.

The bending or rolling up of such a mat means a relatively small amount of work. On complex processing of the other roller parts can omitted if one of the openings and the adjoining channels.

Advantageously, the inside of the mat is covered with a airtight cover. This cover can be formed by a plastic film because only low pressures and forces act here.

Preferably, before inserting it into the roll shell Recesses created in the mat. These recesses increase the mat's ability to absorb air. In the aerial view, one is in the recesses about increased air pressure, which may then occur can degrade into the mat. If these recesses can still create when the mat is flat or spread out, then the processing very easy.

It is particularly preferred that the recesses through the thickness of the mat. The recesses can be done simply by punching or drilling be generated.

The position of the recesses is preferably brought in accordance with the position of the channels. In this In this case, the channels open into the recesses, which creates the desired air absorption capacity of the mat is achieved.

Fig. 1

einen Doppeltragwalzenwickler mit einer Rollenwicklerwalze nach einer ersten Ausführungsform,

Fig. 2

einen vergrößerten Ausschnitt aus einer Rollenwicklerwalze gemäß einer zweiten Ausführungsform und

Fig. 3

eine schematische Darstellung einer porösen Schicht.

The invention is described below with reference to preferred embodiments in conjunction with the drawing. Show here:

Fig. 1

a double carrier roller winder with a roller winder roller according to a first embodiment,

Fig. 2

an enlarged section of a roll winder roller according to a second embodiment and

Fig. 3

a schematic representation of a porous layer.

Fig. 1 shows a double carrier roll winder 1 for winding a paper web 3 to a paper roll 2. Die Paper roll 2 is in a changing bed 4, the by a first support roller 5 and a second support roller 6 is formed. At least one support roller 5, 6, preferably both support rollers 5, 5 are driven.

To the bearing forces with increasing weight of the paper roll 2 on the support nips or lines on the support rollers 5, 6 not to get too big is in the winding bed 4 a blow box 7 with a compressed air connection 8 arranged by the compressed air in the direction of a Arrow 9 can be blown into the changing bed. This creates an overpressure, which is the weight of the paper roll 2 at least partially relieved.

Air adheres to the incoming paper web 3 also in a gusset 10 between the inlet of the paper web 3 and roller 5 is torn. This layer of air could cause the paper web 3 to float on the Carrier roller 5 lead, which is undesirable.

For this reason, the supporting roller 5 has the one in FIG. 1 schematically shown structure. The support roller 5 has first an elastic surface layer 11. Under the surface layer 11, i.e. radially further inside, a "porous" layer is arranged, which in turn a core 13 surrounding the actual mechanical Support function of the support roller 5 fulfilled. The support roller 5 has a peripheral surface 14 with a plurality of openings 15, which are connected to channels 16, which penetrate the surface layer 11. The canals 15 therefore open at the porous layer 12. The porous Layer 12 has some due to its porosity Air intake volume, i.e. Air coming in Paper web 3 adheres, can through the openings 15 and the channels 16 penetrate into the porous layer 12. The porous layer then serves as a buffer for the incoming air, i.e. it takes in the air but puts a certain resistance to the further flow opposite. This is enough to get the on the paper roll 2 to create an alternative room for adhering air.

Conversely, the flow resistance is porous Layer 12 so large that compressed air from the winding bed 4th is not able or only to a very limited extent the porous layer to get to areas that are outside of the winding bed 4 and not from the paper web 3 are covered. The air loss through the porous So layers are kept very small. Of course, some compressed air enters the porous layer on. This is then after leaving the changing bed 4 released into the environment again. Noteworthy losses are not connected to it.

Fig. 2 shows another embodiment of a support roller 5 '. The support roller 5 'also has an elastic Surface layer 11, arranged in the openings 15 are that continue in channels 16. The canals 16 penetrate both the elastic surface layer 11 as well as a roller jacket 17. The roller jacket 17 is exactly like the core 13 in the support roller 5 after Fig. 1, able to absorb the forces when Winding the paper roll 2 arise. Inside the roll shell 17, the porous layer 12 'is arranged. On its radial inside is airtight Foil 18 attached. In addition, in the field of Channels 16 each have recesses 19 which the Have the shape of a hollow cylinder, which is at least in Circumferential direction of the support roller 5 'slightly expanded. This Recesses 19 provide an air intake volume In which the air from the openings 14 forth can penetrate, the walls of these recesses 19 can be slightly permeable to air.

Layer 12 'consists of one shown in FIG Mat 20, into which the recesses 19 are punched or are drilled. Push through the recesses 19 the mat 20 over its entire thickness. The recesses are then closed by the film 18. The so prepared mat 20 is bent into a cylinder. As a result, the recesses 19 expand something in the circumferential direction. The cylinder shaped Mat 20 is inserted into the roller jacket 17. You just have to make sure that the recesses 19 overlap with the channels 16. But this is easily possible because of the recesses 19 a larger diameter or a larger clear Width than 16 channels. Because of their inherent elasticity the mat 20 then stretches into the roll shell 17. At the joint edges where the two Should touch the ends of the mat 20 again, too a gap will arise as long as no channels in this gap 16 mouth.

The openings 15 can be along an axis parallel Line be arranged. But you can also become one such an axially parallel line a predetermined Take angles, which has the advantage that even at higher Rotation speeds a howling sound can be largely avoided. Because of the air intake Material of the porous layer 12, 12 ' this noise is already muffled anyway.

You can also replace the recesses 19 with grooves, which are milled or cut into the mat 20. These grooves can be arranged, for example, that with a "rolled up" mat parallel to one axially parallel line. But you can, too the openings 15 have a corresponding arrangement, at a predetermined angle to such axially parallel line can be arranged. The edited like this The mat is then bent together and into the Cavity arranged in the roll core, so that the Grooves of the inner wall of the roll core are facing. The Openings 15 then open into the corresponding grooves, which are closed on the front and thus the air intake volumes form. The front closure can either be realized by the grooves not over the entire axial length of the mat 20 lets go through, or by having after installation the mat 20 in the roller shell 17 closure pieces starts.

The grooves will roll through the mat 20 trapezoidal in cross-section in most cases expand. However, this is perfectly acceptable.

Claims (12)

1. Roll winder drum having a surface on the circumference and openings in the surface which, via ducts that pass through the surface, are connected to air-accommodating volumes, characterized in that the air-accommodating volumes are arranged in a porous layer (12, 12').
2. Drum according to Claim 1, characterized in that the porous layer (12, 12') is provided with an air-impermeable covering (13, 18) on its radially inner side.
3. Drum according to Claim 1 or 2, characterized in that the air-accommodating volumes are formed by pronounced voids (19) in the porous layer (12').
4. Drum according to Claim 3, characterized in that the voids (19) are formed as hollow cylinders whose diameter is greater than the diameter of the ducts (16).
5. Drum according to one of Claims 1 to 4, characterized in that the porous layer (12') is arranged radially inside a load-bearing drum shell (17).
6. Drum according to one of Claims 1 to 5, characterized in that the porous layer is formed of a cylindrically curved mat (20) which bears radially under its own tension on the inside of the drum shell (17).
7. Drum according to one of Claims 1 to 6, characterized in that the porous layer (12, 12') is formed by a foam-like or grid-like material.
8. Method of producing a roll winder drum, in which the roll winder drum is provided with openings and ducts adjacent thereto in its circumferential surface, characterized in that a mat of a flexible material with a predetermined air-accommodating capacity is bent cylindrically and inserted into a cavity formed by a drum shell.
9. Method according to Claim 8, characterized in that the mat is provided with an air-impermeable covering on its inner side.
10. Method according to Claim 8 or 9, characterized in that, before the insertion into the drum shell, cut-outs are produced in the mat.
11. Method according to Claim 10, characterized in that the cut-outs are led through the thickness of the mat.
12. Method according to Claim 10 or 11, characterized in that the position of the cut-outs is made to coincide with the position of the ducts.

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