DE102019126895A1 - Rolling device with hollow cylinder - Google Patents

Abstract

A rolling device (100) for rolling out material webs has a rotatable, rolling hollow cylinder (110), at least one support element (120) for the hollow cylinder and a pressure belt (130) which is stretched around part of the circumference of the hollow cylinder (110) and can run over the hollow cylinder (110) in such a way that the material (200) to be rolled is guided between the pressure belt (130) and the hollow cylinder (110). Here, the hollow cylinder (110) is held by the tensioned pressure band (130) and the at least one support element (120) in a working position in which the support element (120) attaches the hollow cylinder (110) to its inner jacket surface or to its outer jacket surface (114). supports. The pressure belt (130) is suitable for causing a rotation of the hollow cylinder (110) in the working position and thus a conveyance of the material (200) in the direction of rotation by running off.

Description

The present invention relates to a rolling device in which the material to be rolled is guided over a hollow cylinder.

In various areas of manufacturing technology, rolling devices are used in which a material is guided on a roller and at the same time pressed onto the roller by a pressure belt placed around the roller. The pressure acting on the material causes it to be rolled out. In addition, the pressure can promote and / or trigger chemical reactions in the material, e.g. when a rubber compound is vulcanized to form rubber or the like.

It is therefore of interest that an area in which the material is pressed in between the pressure belt and the roller is as large as possible in order to be able to apply pressure to the greatest possible amount of the material at the same time. For this reason, the rollers used must have a large radius. This makes the rollers, which are usually made of steel, very heavy. A rotatable bearing of the rollers that is necessary for the application becomes technically complex and therefore cost-intensive. The maintenance of the system, such as changing the printing belt or the roller, is complex due to the large mass and thus the great inertia of the rollers.

In addition to the generation of high pressure by the pressure belt, it is necessary for many manufacturing processes to bring the material to be rolled to a certain temperature. For example, rubber has to be heated in order to initiate vulcanization into rubber. In order to control the temperature of the material to be rolled out, the roller is usually brought to a certain temperature. This happens due to the mass by means of a temperature control medium that functions as a heat transporter, such as thermal oil, water, steam or the like, with which heat can be supplied or removed. For this purpose, the inside of the rollers used is provided with a line system which allows the temperature control medium to be guided through the roller and thereby to heat or cool it. The large mass of the roller means that a large amount of heat is required to heat the roller.

In this case, no simple steel cylinders of the desired size, which can be produced comparatively easily and inexpensively, cannot be used as rollers. Rather, it is necessary to provide such steel cylinders with a line system for the temperature control medium, which makes the production of the rollers considerably more expensive. Also, because of the connections required for supplying the temperature control medium, the suspension or mounting of the rollers is technically complex and therefore expensive.

The object of the invention is therefore to provide a rolling device whose rollers can be produced in a simple and inexpensive manner, which simplify maintenance and which, if necessary, can be brought to a predetermined temperature in a simple and cost-saving manner. This problem is solved by the subject matter of the claims.

For example, a rolling device for rolling out a material web can have a rotatable, rolling hollow cylinder, at least one support element for the hollow cylinder and a pressure belt which is stretched around part of the circumference of the hollow cylinder and can run over the hollow cylinder in such a way that material to be rolled is between the pressure belt and hollow cylinder is guided. Here, the hollow cylinder is held by the tensioned pressure band and the at least one support element in a working position in which the support element supports the hollow cylinder on its inner jacket surface or its outer jacket surface. The pressure belt is suitable for causing a rotation of the hollow cylinder in the working position and thus a conveyance of the material in the direction of rotation by its running off.

Instead of using a solid cylinder as a roller, which is rotatably mounted along its central axis, a hollow cylinder that is held in a rolling manner should be used. This offers the advantage of a considerable reduction in mass without having to change the area required for the rolling process, namely the outer surface of the (hollow) cylinder. In this way, material can be saved to a considerable extent, which leads to a reduction in costs.

Since the roller used is hollow on the inside, it cannot be suspended from a central axis of the hollow cylinder. Rather, the hollow cylinder is held in its working position by the pressure belt and at least one support element.

As is known from the prior art, the pressure belt can be a steel belt (or a steel web) that is deflected over several rollers or bearings and pressed onto the hollow cylinder and can have almost the entire width of the hollow cylinder. Tension is given by slowly letting the pressure band run off onto the pressure band. Since the pressure band runs around the hollow cylinder, the pressure band is pressed radially onto the hollow cylinder by this pull. At the same time, the printing belt moves at a defined angle to the hollow cylinder over the latter or over the material located on the hollow cylinder away. Due to the strong pressure in the radial direction, the hollow cylinder and the material pressed onto it by the printing belt rotate at the same speed as the printing belt moves past due to the high friction. In this known manner, the material is simultaneously pressurized and conveyed through the rolling device.

In order to hold the hollow cylinder against the pressure of the printing tape in the same working position as is necessary for a continuous working process, one or more support elements are necessary which support the hollow cylinder against this pressure. These support elements can support the hollow cylinder on its outer surface. They are then arranged on the side of the hollow cylinder opposite the contact side of the printing tape. However, the support elements can also be arranged inside the hollow cylinder in order to support the hollow cylinder on its inner lateral surface. Then the support elements are arranged in the direction of the printing tape. An external support offers the advantage that the roller formed by the hollow cylinder can be installed or replaced in a simple manner. An internal support, on the other hand, saves space, which can be an advantage in particular in the case of compact machines.

Due to the interaction of the printing belt and the support element, it is possible to replace the heavy and expensive full cylinder rollers, which are usually used, with hollow cylinders with a considerably lower weight. The structure of conventional rolling devices can remain unchanged except for the differently designed suspension of the roller and the replacement of the roller. In particular, the guidance of the printing tape and the material to be rolled is unchanged and known to a person skilled in the art, which is why a description of these components is unnecessary at this point. In addition, the roller designed as a hollow cylinder can be used in any device in which a pressure belt applies pressure to a roller. What is essential here is the weight reduction through the use of a hollow cylinder and the holding of the hollow cylinder in its working position through the interaction of the pressure belt and at least one support element. The other components of a rolling device in which the hollow cylinder is used are of secondary importance.

The wall thickness of the hollow cylinder can be between 1% and 20% of the outer diameter of the hollow cylinder, preferably 1%, 2%, 5%, 10%, 15% or 20%. In particular, the wall thickness of the hollow cylinder can be selected depending on the material used for the cylinder, the material to be processed and the pressure applied for this in such a way that there is no deformation of the hollow cylinder which would impair the work result. For example, steel cylinders with a wall thickness in the range of 5 cm, e.g. 3 cm, 4 cm, 5 cm or 6 cm, can be used for the vulcanization of rubber. Despite this considerable wall thickness, the use of such hollow cylinders still results in a great reduction in material and thus in weight and cost savings.

The outer diameter of the hollow cylinder can be between 200 mm and 5,000 mm, preferably 200 mm, 400 mm, 600 mm, 1,000 mm, 1,500 mm, 2,000 mm, 3,000 mm, 4,000 mm or 5,000 mm. The roller designed as a hollow cylinder can thus be used for all common rolling devices. In principle, any size of roller can be used for the hollow cylinder.

The support elements can support the hollow cylinder in its working position along several axes. Since the support of the hollow cylinder no longer runs centrally over its central axis, but rather takes place on the outer jacket or on the inner jacket, the support elements can also be arranged along several axes and thus support the hollow cylinder at several support points. This further reduces the load-bearing capacity required for an individual support element. Each support element can therefore be made simpler, e.g. less stable against weight loads. This further simplifies the construction and costs can be reduced.

The support elements can be rotatably mounted and the hollow cylinder can roll over the support elements. The support elements are then designed as rollers, shafts, shaft journals, freewheeling wheels, axles, rollers or the like, on which the hollow cylinder rests and rolls. The rotatable support elements can here assume any shape. They can, for example, be rubber-coated wheels or steel rollers that are present in the rolling device. It is particularly advantageous if components of conventional rolling devices, such as other rolls, serve as support elements for the hollow cylinder, as this makes it easier to convert from a full cylinder roll to a hollow cylinder roll.

In particular, the hollow cylinder can be supported on deflection and / or guide rolls of the rolling device, i.e. on rolls that are already used in the rolling device for other purposes.

The support elements can also be sliding elements on which the hollow cylinder slides. Then the support elements do not rotate by themselves, but provide the hollow cylinder with sliding surfaces or sliding profiles, which it can slide along in a controlled manner during its rotation. The sliding surfaces / profiles can be provided with a conventional lubricant, but lubricant-free sliding is also conceivable. The support elements are preferably shaped in such a way that the friction between the support elements and the hollow cylinder is minimal. In this embodiment of the support elements, the mounting of the hollow cylinder is very simple. In the working position, the hollow cylinder is pressed onto the support elements by the pressure belt. As the printing tape runs off, the hollow cylinder rotates and slides over the support elements.

It goes without saying that configurations of the support elements are also conceivable in which mounting on rotatable support elements is combined with mounting on sliding support elements. It is also possible that a rotation is not carried out completely without slipping, i.e. that rolling and sliding on a support element occur in combination.

The support elements can be shorter in the axial direction of the hollow cylinder than the hollow cylinder. The support elements then do not extend completely through the hollow cylinder or do not support it completely on its outer jacket. In particular, it is conceivable that the support elements only support a predetermined outer area of the hollow cylinder, while the hollow cylinder floats freely in its center. However, it is also possible to arrange a number of support elements, such as freewheel wheels or shaft journals, along an axis so that the hollow cylinder is only supported in individual areas. It is also conceivable to support the hollow cylinder in individual areas along different axes, e.g. edge areas of the hollow cylinder on both sides along one axis and the central part along at least one further axis. Individuals of the various support axes can be located both outside and inside the hollow cylinder.

The length and positioning of the support elements can thus be designed to be as flexible as possible in order to ensure the most stable and structurally simple mounting of the hollow cylinder. In principle, there are no limits to the dimensioning and positioning, as long as they can be accommodated spatially in the specific rolling device.

The support elements can be arranged in a force flow-oriented manner, i.e. they absorb the forces exerted by the pressure band on the hollow cylinder in such a way that the result is as little deformation of the hollow cylinder as possible. In particular, the support elements can be arranged symmetrically to an axis or plane defined by the force exerted by the pressure band.

The rolling device can furthermore have a temperature control device for controlling the temperature of the hollow cylinder, preferably in an area in which the material to be rolled can be guided between the pressure belt and the hollow cylinder and / or in a variable area. This allows the material to be brought to a certain temperature via the material of the hollow cylinder (e.g. steel), which is intended for the work step carried out. In particular, the material can be heated in order to induce or enable certain chemical reactions, such as the vulcanization of rubber. But it is also possible to cool the material or to keep it at a certain temperature, e.g. to prevent such reactions. Due to the lower mass of the hollow cylinder compared to a solid cylinder, a lower amount of energy is required to heat the roll than is the case with conventional heatable rolling devices. The temperature-controlled area can be freely adjustable and, for example, also have several zones. However, a spatially fixed area can also be tempered, such as the area in which the material runs between the printing belt and the hollow cylinder, or one or more sub-areas thereof.

The temperature control device can be arranged in a stationary manner, preferably in the interior of the hollow cylinder. The temperature control device does not rotate with the hollow cylinder, but is fixed. In particular, the temperature control device is not connected to the hollow cylinder or part of it. Rather, the desired temperature equalization takes place via the ambient air, by means of (heat) radiation or inductively. This enables an effective and simple heat exchange that works completely independently of the structure of the roller used. Technically complex and cost-intensive lines for a heat exchange medium in the roller can thus be dispensed with.

The temperature control device can be arranged in a space-saving manner within the hollow cylinder in order to heat or cool the hollow cylinder without direct influence on the material to be rolled out and the pressure band. This makes the temperature control particularly effective. The temperature control device can, however, also be arranged outside the hollow cylinder, which simplifies the structure of the rolling device. Cooling units are particularly suitable for cooling the roller, printing belt and material, which act on these elements, for example, with an air flow.

If the temperature control device is suitable for heating the hollow cylinder, this is preferably done by means of induction heating, infrared heating or radiant heaters. As a result, the hollow cylinder, in particular from its interior, in can easily be heated in a certain area. The use of a heating medium is no longer necessary, and there is therefore no need for complex wiring for the heating medium. This leads, on the one hand, to a cost reduction in the manufacture of the roller and, on the other hand, to energy savings.

The hollow cylinder can have an insulating layer on its inner jacket for thermal insulation. As a result, the heat of the hollow cylinder is preferably given off in the direction of the material to be rolled out. This makes the heating more effective.

The rolling device can furthermore have at least one holding device which is suitable for receiving the hollow cylinder when the pressure belt is relaxed. When the pressure band is relaxed, the hollow cylinder can therefore be accommodated by a different mounting than the support elements. Since no pressure is exerted on the hollow cylinder when the pressure band is relaxed, the holding device only has to bear the weight of the hollow cylinder. It can therefore be designed to be less stable than the support elements. It is also possible to move the holding device out of the area of the hollow cylinder during a working operation and to use it only when the pressure band is released. The holding device can carry the hollow cylinder either in a suspended manner or as a frame supporting it from below. Alternatively, the hollow cylinder can also be supported by at least one support element when the pressure band is relaxed. This then simplifies the structure of the rolling device.

The rolling device described above thus works with rolls that can be manufactured inexpensively and easily, that simplify maintenance and that can be brought to a predetermined temperature in a simplified manner and with a comparatively low energy requirement if required.

• 1 eine schematische Querschnittsdarstellung einer Walzvorrichtung;
• 2 eine schematische Querschnittsdarstellung einer Walzvorrichtung mit einer Temperiervorrichtung;
• 3 eine schematische Querschnittsdarstellung einer Walzvorrichtung mit einer Temperiervorrichtung;
• 4 eine schematische Querschnittsdarstellung einer Walzvorrichtung;
• 5A und 5B eine schematische Draufsicht und eine schematische Querschnittsdarstellung einer Walzvorrichtung; und
• 6 eine schematische Querschnittsdarstellung einer Walzvorrichtung.

Such rolling devices are to be described in more detail below with reference to the figures. However, the following description is to be regarded as purely exemplary. The invention is determined solely by the subject matter of the claims. It shows:

• 1 a schematic cross-sectional view of a rolling device;
• 2 a schematic cross-sectional view of a rolling device with a temperature control device;
• 3 a schematic cross-sectional view of a rolling device with a temperature control device;
• 4th a schematic cross-sectional view of a rolling device;
• 5A and 5B a schematic plan view and a schematic cross-sectional view of a rolling device; and
• 6th a schematic cross-sectional representation of a rolling device.

The 1 shows schematically a cross section through the roll of a rolling device 100 . The roller is a hollow cylinder 110 trained and in one area 116 from a printing tape 130 spanned. Hollow cylinder 110 and printing tape 130 serve to material 200 or to guide a strip of material between them in order to roll this out.

The position of the hollow cylinder 110 and the printing tape 130 in the overall network of the rolling device 100 corresponds to the usual structure known to a person skilled in the art. In particular, the printing tape 130 via one or more pulleys 160 via the hollow cylinder constituting the roller 110 under tension and slowly guided in the direction of arrow A. The printing tape 130 can be made of steel and have a width (perpendicular to the image plane of the 1 ) have that of the hollow cylinder 110 corresponds to. The tensile force on the pressure band 130 can be in the range of a few mega-newtons, e.g. 1 MN, 3 MN, 5MN or in between. This will put in the area 116 in which the ribbon 130 on the hollow cylinder 110 there is a pressure of a few bars on the material 200 generated, for example 5 bar, 8 bar, 10 bar or in between. In particular, a pressure between 6 bar and 8 bar can be generated.

By moving the drawstring 130 the hollow cylinder rotates in the direction of arrow A. 110 in the direction of arrow B, since that is on the hollow cylinder 110 pressed material 200 the hollow cylinder 110 in the direction of movement of the drawstring 130 carries. This is how the material becomes 200 with the drawstring 130 promoted. The guidance of the printing tape 130 via pulleys 160 or the like, the generation of the tensile force on the printing belt 130 and guiding the material 200 by the rolling device 100 is known from the prior art and does not need to be described in more detail at this point.

In contrast to the rolls known from the prior art, in the rolling device 100 but the hollow cylinder 110 used. The hollow cylinder 110 can be made of steel in a known manner. It can have a wall thickness between 1% and 20%, preferably between 5% and 15% or in the range of 10% of the outer diameter of the hollow cylinder. In contrast to a full cylinder usually used as a roller, about 70% material and thus also weight can be saved. The outer diameter of the hollow cylinder can be between 200 mm and 5,000 mm, preferably between 500 mm and 4,000 mm, or 1,000 mm and 3,000 mm. This creates a sufficiently large work area 116 guaranteed. It goes without saying that the hollow cylinder 110 can be made of any other sufficiently stable material. Steel is just one common example.

Since a suspension along a central axis is not possible during working operation, ie when the tension belt is in place, the rolling device has at least one support element 120 on to the hollow cylinder 110 when pressure is applied through the pressure band 130 in its working position.

In the 1 are two supporting elements 120 shown, which are rotatably mounted. This can be any type of rotatable mounting, for example roller bearings, shafts, rollers, pins, axles, freewheeling wheels or the like. Like in the 1 such rotatably mounted support elements can be shown 120 on the outer jacket surface 114 of the hollow cylinder 110 be arranged. You take those off the tape 130 on the hollow cylinder 110 exerted forces and allow the hollow cylinder 110 , according to the movement of the printing tape 130 to rotate. The speed of rotation of the hollow cylinder 110 is here at a few revolutions per minute, for example at up to 5 rpm.

Instead of the hollow cylinder 110 on rotatable support elements 120 To support, it is also possible to support elements 120 to use on which the hollow cylinder 110 is guided on a sliding basis. Such a configuration is in the 2 shown. Support elements designed as sliding blocks are located here 120 on the print tape 130 remote side of the outer jacket surface 114 on. These are designed in such a way that the friction between the outer jacket surface 114 and support elements 120 is reduced as much as possible, e.g. due to sliding profiles. The sliding of the hollow cylinder 110 on the support elements 120 can be facilitated by lubricants such as lubricating oil or the like. Alternatively, with correspondingly smooth and hard surfaces, lubricant-free sliding is also possible.

As in the 3 to 6th can see the support elements 120 also inside the hollow cylinder 110 be arranged. This results in a particularly space-saving construction that does not differ from the outside of the construction of conventional rolling devices. In the case of the external support, on the other hand, the hollow cylinder is installed / removed 110 simplified. It goes without saying in all figures that the position and the number of support elements are arbitrary, as long as there is secure support against the pressure of the printing tape 130 is guaranteed.

In the 3 is an example of a suspension of the hollow cylinder 110 by means of two support elements 120 shown, which form two different axes. This is the storage of the hollow cylinder 110 stabilized, as there is essentially no play for movements of the hollow cylinder 110 perpendicular to the axial direction. It goes without saying that more than two axes can also be in any position inside and outside the hollow cylinder 110 can be used as long as this is a secure storage of the hollow cylinder 110 in his working position.

In the 4th is an example of a force flow-oriented mounting of the hollow cylinder 110 by means of a single support element 120 shown. The support element 120 lies on the ribbon 130 directly opposite and therefore takes the on the hollow cylinder 110 acting forces directly. It goes without saying that there is also more than one support element 120 the hollow cylinder 110 on its inner surface 112 in that area 116 Can support force flow-oriented that the pressure band 130 opposite. As a result, the hollow cylinder can continue to counter the forces of the printing belt if necessary 130 be supported.

The rolling device 100 can also have a temperature control device 140 for tempering the hollow cylinder 110 have, so in particular for heating and cooling the hollow cylinder 110 . This can be advantageous, for example, in applications in which the material 200 must be brought to a certain temperature. For example, when rubber is vulcanized, it is necessary to maintain a defined temperature as well as a defined pressure. However, it can also be necessary for other production processes to change the material 200 to cool or to keep at a certain temperature.

The temperature control device works for this purpose 140 on the area 116 one to the temperature of the material 200 adjust. Like in the 2 shown, this can be done by temperature control devices 140 can be achieved inside the hollow cylinder 110 are arranged. For example, a heating coil, an infrared radiator or the like can be located inside the hollow cylinder 110 the heat radiation to the area 116 of the hollow cylinder 110 gives him and thus in this area 116 heats up. The hollow cylinder 110 be inductively heated. There is a heating up of the hollow cylinder 110 is essentially in the area in which the material is of interest 200 in contact with the hollow cylinder 110 the thermal radiation or the induction field can be focused on this area. This makes the heating more efficient while using the same amount of energy. Instead of heating, however, cooling can also take place from the inside, for example by means of cooling units or a simple flow of cooling air.

The temperature control device 140 but can also be applied to other areas of the hollow cylinder 110 act as the area 116 . In particular, partial areas can be tempered that are smaller or larger than the area 116 are that before or after the area 116 are arranged or those with the area 116 overlap. The effective range of the temperature control device can also 140 be variable and, for example, can be changed over time.

Like in the 3 the temperature control device can be shown 140 alternatively or in addition to the combination of hollow cylinders from the outside 110 , Material 200 and printing tape 130 act. This simplifies the construction of the rolling device 100 , but is less space-saving. Also the external temperature control device 140 can be designed as heating or cooling. Again, there is a focus on the area 116 possible.

In this way, without the use of a line system within the wall of the hollow cylinder 110 , ie the one in the rolling device 100 used roller, the temperature of the material to be rolled 200 can be set. This eliminates the need for expensive and technically complex connections for a temperature control medium. In addition, the production of the roller is less expensive and technically simpler.

About the temperature control of the material 200 The inner circumferential surface can be designed to be particularly effective 112 of the hollow cylinder 110 be formed with an insulating or damping layer that transports heat from the hollow cylinder 110 reduced in its interior. The temperature control device is located for this purpose 140 preferably not even in this interior space, except for inductive processes.

As in the 2 and 3 the temperature control device is shown 140 preferably arranged statically, ie it is compared to the rotating hollow cylinder 110 fixed and acts in each case on the sections of the hollow cylinder 110 one that is in the effective range of the temperature control device 140 be rotated (in the 2 as a dashed cone in which 3 shown as wavy lines). If this is desired, the temperature control device 140 but also be rotatably arranged in order to always focus on the same area of the hollow cylinder 110 to act. The temperature control device can also 140 on the entire hollow cylinder 110 act if this is an advantage.

In the 5A , 5B and 6th are exemplary configurations of the rolling device 100 shown, in addition to the elements described above, a holding device 150 for storing the hollow cylinder 110 exhibit when the print tape 130 is relaxed.

The 5A shows a plan view of the hollow cylinder 110 in his working position. The 5B shows a cross-sectional view of the hollow cylinder 110 along line II.

Like in the 5A to see lies a number of support elements 120 along an axis x on the inner lateral surface 112 of the hollow cylinder 110 on. The support elements 120 have a shorter axial length than the hollow cylinder 110 and thereby only support an edge area and a central area of the hollow cylinder 110 . The support elements 120 can here z. B. be free wheels or shaft journals that are mounted on the axis x.

It goes without saying that several or fewer support elements of this type can also be used 120 can be lined up along an axis. In particular, only the edge regions of the hollow cylinder can 110 of support elements 120 be worn. It also goes without saying that all of the 1 to 6th shown support elements 120 not over the entire length of the hollow cylinder 110 need to extend, but only over selected parts and in axial series with other support elements 120 .

Support elements must be in the axial position 120 are also not in the same position on different axes. Rather, one is only in individual areas, ie only on a limited area of the hollow cylinder 110 Attacking support by various rotatable or non-rotatable support elements 120 different designs and different dimensions are conceivable. An example of this shows 6th , in which external sliding elements are combined along two axes with an internal rotatable bearing along a further axis.

The rolling device of the 5A and 5B additionally has a continuous shaft or a continuous rod as a holding device 150 on. Like in the 5B can be seen, this is in the working position of the hollow cylinder 110 in the interior of the hollow cylinder 110 without touching the hollow cylinder. If the pressure band now relaxes, the hollow cylinder sinks 110 down until it is off the holding device 150 is supported against gravity. The hollow cylinder hangs in this maintenance position 110 so on the holding device 150 . For this purpose, it may also be sufficient to place two in the edge area of the hollow cylinder 110 engaging bolts or the like instead of a continuous rod for the holding device 150 to use. In principle, these can also emerge from the hollow cylinder in the axial direction 110 be retractable, whereby the installation or the exchange of the hollow cylinder 110 is simplified.

Like in the 6th shown by way of example, a holding device 150 also below the hollow cylinder 110 are located around this on its outer lateral surface 114 to support. The hollow cylinder 110 then lies with the ribbon removed 130 on the holding device 150 on and is carried by this. Here, too, it is possible to use the holding device 150 only to the edge areas of the hollow cylinder 110 to attack and the holding device 150 during operation of the rolling device from the hollow cylinder 110 to remove.

In this way, the hollow cylinder 110 for maintenance of the rolling device 100 or to replace components of the rolling device 100 be safely stored without the support elements 120 to claim. In addition, the additional holding device allows 150 who have favourited Supporting Elements 120 to be placed more flexibly and in particular in a force flow-oriented manner, since no consideration has to be given to the fact that the support elements 120 the hollow cylinder 110 in a maintenance position, ie without the application of force by the pressure belt 130 can also hold. As described above, there are therefore a number of advantageous possibilities of using a roller designed as a hollow cylinder instead of a solid cylinder in a rolling device. The lower mass of the hollow cylinder has the advantage here of making the production of the roller cheaper. In addition, the operation is also cheaper, since less energy has to be used for the movement - and, if desired, for the temperature control - of the roller.

List of reference symbols

100

Rolling device

110

Hollow cylinder

112

inner surface of the hollow cylinder

114

outer jacket surface of the hollow cylinder

116

Area in which the material is fed from the printing belt

120

Support elements

130

Printing tape

140

Temperature control device

150

Holding device

160

Pulley

200

material to be rolled out

Claims (12)

Rolling device (100) for rolling out material webs, having a rotatable hollow cylinder (110) held in a rolling manner; at least one support element (120) for the hollow cylinder; and a pressure belt (130) which is stretched around part of the circumference of the hollow cylinder (110) and can run over the hollow cylinder (110) in such a way that material (200) to be rolled is guided between the pressure belt (130) and the hollow cylinder (110); in which the hollow cylinder (110) is held in a working position by the tensioned pressure band (130) and the at least one support element (120) in which the support element (120) holds the hollow cylinder (110) on its inner jacket surface (112) or on its outer jacket surface ( 114) supports; and the pressure belt (130) is suitable for causing a rotation of the hollow cylinder (110) in the working position and thus a conveyance of the material (200) in the direction of rotation by its running off. Rolling device (100) after Claim 1 , the wall thickness of the hollow cylinder (110) being between 1% and 20% of the outer diameter of the hollow cylinder (110), preferably 1%, 2%, 5%, 10%, 15% or 20%. Rolling device (100) according to one of the preceding claims, wherein the outer diameter of the hollow cylinder (110) is between 200 mm and 5,000 mm, preferably 200 mm, 400 mm, 600 mm, 1,000 mm, 1,500 mm, 2,000 mm, 3,000 mm, 4,000 mm or 5,000 mm. Rolling device (100) according to one of the preceding claims, wherein the support elements (120) support the hollow cylinder (110) in its working position along a plurality of axes. Rolling device (100) according to one of the preceding claims, wherein the at least one support element (120) is rotatably mounted and the hollow cylinder (110) rolls over the support element (120); or the hollow cylinder (110) is supported on deflection and / or guide rollers of the rolling device (100); or the hollow cylinder (110) slides on the at least one support element (120). Rolling device (100) according to one of the preceding claims, wherein the support elements (120) are shorter in the axial direction of the hollow cylinder (100) than the hollow cylinder (110). Rolling device (100) according to one of the preceding claims, wherein the at least one support element (120) is arranged in a force flow-oriented manner. Rolling device (100) according to one of the preceding claims, further comprising a temperature control device (140) for temperature control of the hollow cylinder (110), preferably in an area (116) in which the material (200) to be rolled is between the pressure belt (130) and the hollow cylinder ( 110) can be guided and / or in a variable area. Rolling device (100) after Claim 8 , the temperature control device (140) being arranged in a stationary manner, preferably in the interior of the hollow cylinder (110). Rolling device (100) after Claim 8 or 9 , wherein the temperature control device (140) is suitable for heating the hollow cylinder (110), preferably by means of induction heating, infrared heating or radiant heaters. Rolling device (100) according to one of the Claims 8 to 10 , the hollow cylinder (110) having an insulating layer (118) for thermal insulation on its inner jacket surface (112). Rolling device (100) according to one of the preceding claims, further comprising at least one holding device (150) which is suitable for receiving the hollow cylinder (110) when the pressure belt (130) is relaxed.

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