EP2867408A1

EP2867408A1 - Multi-walled cylinder for thermally and/or mechanically treating material webs

Info

Publication number: EP2867408A1
Application number: EP13729616.6A
Authority: EP
Inventors: Wolfgang Wiertz; Wolfgang Mark; Volkhard NIEBUHR; Ludwig Hellenthal
Original assignee: Gapcon GmbH
Current assignee: Gapcon GmbH
Priority date: 2012-05-23
Filing date: 2013-05-22
Publication date: 2015-05-06
Also published as: WO2013174880A1; DE102012104462A1

Abstract

The invention relates to a multi-walled cylinder for drying and/or mechanically treating planar material webs, particularly a Yankee cylinder, drying cylinder or heating cylinder, and which comprises an outer casing (1) with a temperature-controllable surface (3), and an inner casing (2), with flow channels (6) in which a thermal medium (5) can be conducted being located below said temperature-controllable surface. The invention is characterised in that the cylinder comprises a connection region (4) between the inner side of the outer casing and the outer side of the inner casing, which fixes said outer casing and inner casing in a bonded manner.

Description

Multi-walled cylinder for thermal and / or mechanical treatment of webs

The present invention relates to a multi-walled cylinder for drying and / or mechanical treatment of sheet material webs and a

Method for producing the multi-walled cylinder. Furthermore, the invention also relates to the use of a multi-walled cylinder for drying and / or mechanical treatment of tissue, paper, cardboard and / or cardboard and preferably for the production of tissue and / or at least one-sided smooth paper, cardboard and / or cardboard. In the prior art are cylinders for drying and / or mechanical

Treatment of sheet-like material webs known, which are used for example in textile, nonwoven, paper, board or tissue production. The cylinders are preferably used as single-walled cylinders. Especially with tempered rollers single wall constructions are common in the heating. In the tissue sector, Yankee cylinders with large diameters and construction dimensions are known in particular as cylinder tappets.

Yankee cylinders are usually steam-heated from the inside, dry an applied material web and transfer their usually very smooth surface on paper, cardboard or cardboard onto the material web. In the Tissuehersteliung one or more scrapers or creping scrapers are used, which is the paper web of the

Loosen the cylinder surface and possibly cause creping of the paper web. The listed on the cylinder surface material web may additionally with hot air, water vapor and / or radiant energy such as heat, Infrared radiation, etc. are heated or dried. The installation of a hood over the Yankee Zyiinder serves to accommodate the aforementioned desiccants and methods, the support of the drying process and the demarcation to the environment, so that, inter alia, energy losses are minimized, increased the dry power and discharged emissions such as vapors of water or solvent become.

From manufacturing, logistics, technological and economic

For reasons, it is advantageous the sizes and in particular the weight of

Reduce Yankee cylinders and save costs and increase production speeds, for example, through improved use of thermal energy.

Against this background, it is an object of the present invention to provide a multi-walled cylinder and a method for its production which at least partially overcomes the disadvantages known in the prior art.

The above object is achieved by a multi-walled cylinder as claimed in claim 1. The method for producing the multi-walled cylinder according to claim 20 solves the above object, wherein preferred embodiments of the invention subject matter

Subclaims are.

According to claim 1, the multi-walled cylinder according to the invention with, for example, an outer diameter of preferably greater than 3 m, to

Drying and / or mechanical treatment of sheet-like material webs on an outer shell with a temperature-controllable surface and an inner shell, wherein the inside of the outer shell and the outside of the inner shell over a connection area material, force and / or positively fixed with each other.

In the context of the present invention, a multi-walled cylinder is understood to mean a rotatable cylinder which is built up in layers from a plurality of (at least two) walls or wall sections. The walls are preferably arranged centrally about the axis of rotation of the cylinder. At a Layer by layer viewing from the outer wall towards the cylinder center, the outermost wall is referred to as the outer jacket and the inner wall as the inner jacket. Outer and inner sheath are connected to each other on their sides facing at least cohesively, but can also be non-positively, for example

frictionally engaged and / or positively connected if necessary via one or more layers. The area between the inside of the

Outer jacket and the outside of the inner shell is referred to as a connection region. The connection region fixes the outer casing and the inner casing to one another, wherein according to a preferred embodiment also the

Connecting region merges directly into the inner shell or outer sheath or is integrally formed with this and thus forms a unit.

It should also be borne in mind that, according to the present invention, it is not necessary for the inner jacket to be a full-surface cylindrical jacket, but that it merely forms corresponding sections of such a jacket, recesses, recesses and / or only areas of one

Has cylinder jacket and that the inner shell is formed of individual components, such as sheets, strips or profiles, which need not necessarily be directly connected to each other. Such components can in particular also form only a support structure, which is arranged within the outer jacket and form the inner jacket via a connection region. In addition, can

especially the inner mantle! also be formed from tube bundles, which also provide the flow channels.

The frictional fixation can, for example, by shrinking or

Shrink on. Shrinking is a technical procedure for

non-positive connection of two components based on the principle of thermal expansion. In this method, the elements to be joined together, such as outer jacket and inner jacket, have an interference fit. Thus, under Normaitemperaturbedtngungen both elements can not be connected or only with great force. At the

The element to be shrunk, such as the

Outer jacket with respect to its material-specific temperature conditions so heated that it expands so far that it can be mounted on the component to be enclosed, such as the inner shell. At the Cooling shrinks the outer shell again and presses against the inner shell. In this case, a compound is formed by frictional engagement. The reverse process, in which, for example, the inner shell shrinks by cooling and fits into the outer jacket is the so-called cold stretching. Both methods can also be combined with each other.

Cohesive fixings or connections are joining methods such as casting, gluing, soldering and welding. The casting is a joining process in which

Joining parts by means of sealing compounds are materially connected. When gluing the adhesive connects the components. Adhesives used can be cold or warm curing. Optionally, when molding the mold-forming formwork remain as an inner shell or be removed again, so that the potting compound itself forms the inner shell. When soldering the solder serves as a connecting material, which is usually a metal alloy that melts easily, to metallic

Connection of two metallic components. Welding is understood to mean the permanent connection of components using heat and / or pressure. One example is fusion welding, in which the materials to be bonded are heated until they liquefy and mix so that they are firmly bonded together after solidification.

Other cohesive connection options are vulcanization and sintering. For the purposes of the present invention, vulcanization is understood as meaning, for example, the crosslinking of rubbers or silicone rubbers which, for example, connect the outer jacket to the inner jacket or even form the inner jacket. During sintering, substances are heated, usually under elevated pressure, to temperatures close to their melting temperatures, and these are thus connected to one another.

The methods of making the connection may also be combinations of the above-mentioned joining techniques. For example, potting compounds and shrink fit can be combined. Heating of the outer jacket leads to the formation of a temperature gradient. The potting compound introduced into the connecting gap under overpressure cures under a temperature gradient analogous to the operating conditions at a higher temperature level.

As a result, in the potting compound after curing and cooling

Internal compressive stresses introduced. By fixation in the sense of the present invention, at least one integral fixation of the inside of the outer jacket of a cylinder with the outside of the inner jacket of a cylinder, which can also be configured as a support structure, is understood by means of a connection region. Of the

Bonding area may, according to the methods listed above with a bonding material such as mineral potting compounds, plastic-based

Be filled sealing compounds, adhesives, solders and / or polymer compounds and / or reinforcing elements such as fibers, reinforcements and

Connecting elements such as connecting stiffeners, weld beads, head bolts, webs, lamellae, pins, nails, etc. included. The connecting elements may be on the inside of the outer shell and / or the outside of the

Be arranged inside sheath. In addition, with poor and / or impossible accessibility to the connection region of the outer, but preferably the Innenmantei have recesses over which the outside of the

Inner shell with the inside of the outer shell in particular by

Punch welding or spot welding is connected. Also by recesses and surveys or by surface treatment z. B. sandblasting, the bond between the outside of the inner shell and the inside of the

Outer jacket can be improved. The possibility of creating a suitable material of low thermal conductivity or of high heat transfer resistance (eg possibly filled polymer-based, metallic or mineral potting compounds, metal foams) is advantageous in providing a thermal insulation area between the outer jacket and the inner jacket and, for example with connecting elements, which preferably in the connection area

protrude to improve a fixation between the outer jacket and inner shell of a cylinder.

Further advantages of the cylinder according to the invention are, for example, higher strength, stiffness and torsion properties, as well as improved concentricity properties. As a result, for example, lighter construction methods can be made possible and drive energy savings can be realized.

Drying in the context of the present invention is the lowering of the moisture content as well as the discharge of liquids and / or Reaction products of a material web understood by thermal treatment. Examples of cylinders for drying are heatable rotatable cylinders such as drying cylinders, Yankee cylinders, MG cylinders, etc., which are supplied with a heat medium from the inside.

Mechanical treatment in the sense of the present invention, on the one hand, means the interaction between the cylinder surface of the outer shell and the material web. For example, a smooth cylinder surface can be transferred to a material web resting against the cylinder surface. On the other hand, a mechanical treatment can take place in connection with the cylinder surface, e.g. by scraping, creping, unwinding counter rolls, belts or other webs, pressing, compressing, embossing and / or blowing.

Under outer jacket comprising a temperature-controllable surface according to the present invention, the outer surface of the outer shell of a multi-walled cylinder is understood, which comes into contact with the material web and at least transfers thermal energy from a heating or cooling medium on an adjacent material web or receives from this. According to a particularly preferred embodiment, the heating or cooling medium is guided through flow channels arranged below the temperature-controllable surface, such as, for example, channels or grooves, lines, capillaries, hoses, etc. closed towards the inside of the cylinder. In this case, according to a further particularly preferred embodiment, the flow channels at least partially in the outer jacket or inner jacket or on the inner surface of the

Be arranged outer sheath or the outer surface of the inner shell and are preferably spiral, radially, parallel radially, annularly and / or

The flow channels can also be arranged parallel to the axis

Have flow cross section, which is selected from a group, which is square, triangular, polygonal, elliptical, circular, parabolic and

Combinations thereof.

Furthermore, it is also within the meaning of the present invention that the

Flow channels through holes, in particular axial holes in

Outer jacket and / or inner sheath are provided. Alternatively, it is also within the meaning of the present invention that pipes are used for the flow channels, which are bent with a corresponding radius and at a predetermined position in the region of the inside of the outer shell or the outside of the inner shell, preferably cohesively, such as by welding, are arranged , According to a special

In a preferred embodiment, the flow channels can also be embodied as a bundle of raw materials which, for example, themselves have a cylindrical shape

Form body and also partially or completely take over the function of an outer or inner cylinder.

If one assumes such a basic body, it is also in the sense of

present invention that the Außenmantei is placed directly on the outer region of the Grundköpers and / or the inner shell is formed by the connection of the tube bundles directly and / or in combination with additional components such as ribbons, strips and / or profiles.

It is also within the meaning of the present invention that the inner sheath

especially in combination with pipes or tube bundles, not as

full or homogeneous cylinder is executed, but only covers areas and / or zones with respect to the inside of the cylinder and in this case in particular the areawise reinforcement and / or stabilization of the cylinder is used. It is in particular in the sense of the present invention that the inner shell, for example in the form of one or more annular stiffeners, axial stiffeners,

Spiral sheets, sheet metal and / or profile strips, tube bundle, pipe and / or

Hohlprofiikonstruktionen is executed, which / r is preferably connected to at least parts of the flow channels or the inner wall of the outer shell.

Thus, according to a preferred embodiment, the inner sheath may inter alia. a support structure for the outer shell ready, which preferably forms portions of a shell and in particular recesses, recesses and / or areas of a cylinder jacket and / or that the inner shell or the support structure of individual, arranged on Außenmantei components, such as sheets, strips or profiles is formed.

An advantage of this arrangement of the flow channels is a direct

Transfer possibility of thermal energy to the temperature-controlled surface. Further improvements in efficiency and energy saving options can be achieved by insulation effects of the connection area. Furthermore, according to a further preferred embodiment, the thermal conductivity of the outer jacket can be greater than the thermal conductivity of the inner jacket. As a result, heat losses that can occur in the interior of the cylinder can be reduced. Moreover, it is within the meaning of the present invention that, according to a further preferred embodiment, below the

Flow channels of the cylinder, i. an insulation is arranged in the cross section of the cylinder within the radius of the flow channels. This can

For example, be formed cylindrical and introduced into the interior of the cylinder. According to a further preferred embodiment, the insulation can also be partially filled in the grooves and / or channels and thus form, in combination or for themselves, the covering of the inside openings of the recesses and / or grooves.

According to a preferred embodiment of the present invention, the outer shell has an outer zone which is between 1.5 mm and 72 mm, in particular between 1.5 mm and 15 mm thick and encloses at least parts of the temperature-controllable surface. This means that the flow channels, which are arranged below the temperature-controllable surface, at least have a distance from this surface, which is preferably between 1, 5 mm and 72 mm and between 1.5 mm and 15 mm. This ensures in particular that the strength properties of the cylinder can be maintained depending on the heat medium used.

According to a further, particularly preferred embodiment of the multi-walled cylinder, the temperature-controllable surface is finished, preferably chrome-plated and / or coated.

In this way, a better heat transfer to an adjacent material web can take place and it can special surface effects and properties of the adjacent web such as smoothness, gloss and

Surface structures are achieved. In addition, with a refined

temperature-controlled surface the detachment behavior of the dried material web and the possibility of the accumulation of deposits can be improved. The advantages are improved ateriaibahnparanneter and qualities, as well as reduced Maschinenstiilstände such as cleaning downtime.

According to further, particularly preferred embodiments of the multi-walled cylinder, the flow channels are either at least partially in the

Outer jacket or disposed on the inner surface of the outer jacket of the cylinder or at least partially in the under the outer jacket itself

located jacket or on the outer surface of the located under the outer shell jacket of the cylinder.

The advantage of an arrangement in the vicinity of the temperature-controllable surface is a direct transfer of thermal energy to the temperature-controllable surface and to an adjacent material web, or the absorption and removal of thermal energy.

According to a further, particularly preferred embodiment of the multi-walled cylinder, the cohesive fixing is carried out with a method or material selected from a group consisting of gluing, vulcanizing, sintering, brazing, welding, spot welding, gunning, casting, grouting, mineral casting compounds, plastic-based Potting compounds, adhesives, solders and / or polymer compounds, in particular with reinforcing elements such as natural, metallic, mineral and / or plastic-based fibers and / or

Reinforcements and combinations thereof and the like, and in particular the connecting portion (4) between the inside of the outer shell and the

Outside of the carrier shell has a polymer compound which is selected from a group which in addition to copolyester other materials such as thermoset and thermoplastic resins and in particular

Polyphenylene sulfide, polypropylene, poly-1-butene, polyvinyl chloride,

Polyvinylidene chloride, polymethyl methacrylate, polyacrylonitrile, polystyrene, polysulfone, polyacetal, polyvinyl alcohol, polyvinyl acetate, ionomers, fluoroplastic, polyethylene, polyamide, especially a partially aromatic polyamide, polycarbonate, polyester, copolyester, polyphenylene oxide, polysulfone, polyvinyl acetal, polyurethane, and chlorinated polyether, cellulose nitrate , Cellulose acetate, cellulose ethers, phenolic resin, urea resin, thiourea resin, melamine resin, alkyl resin, allyl resin, silicone, silicone rubber, rubber, polyimide, polybenzimidazole, epoxy resin, casein plastic, liquid crystal polymers (LCP), thermosetting molding compounds , networked Polyurthane, polyvinyl chloride, unsaturated polyester resin, fiber-reinforced plastics, and combinations thereof and the like, or solder, sintered material, and combinations thereof and the like or metallic, plastic-based or mineral casting compounds, injection molding plastics or suitable

Casting compounds and combinations thereof and the like.

The purpose of this arrangement of the flow channels is to provide a uniform

To allow distribution or absorption of heat energy at an optimal heat transfer to the temperature-controllable surface of the cylinder. According to building constructions of the cylinder can be mentioned among the given exemplary

Embodiments are selected or combined.

Energy saving and improved, such as faster control options of thermal energy supply and distribution are advantageous.

According to a weather, particularly preferred embodiment of the present invention can be used within the flow channels elements such as turbulence generators, Ableitbleche, interference elements, packing such as Raschig rings, combinations thereof or the like, in order to segregate the particular in the operation of the cylinder

To avoid heat medium in the flow cross-section or at least counteract it. Due to the centrifugal accelerations acting in the cylinder and the acceleration forces resulting therefrom, temperature-induced differences in density depending on the heat medium can increase, in particular during operation at high and very high speeds (eg above 1500 m / min, from 2000 m / mtn or at approx. 3000 m / min) unfavorable temperature gradient in the

Flow cross-section or even lead to a separation of the heat medium, wherein the proportions with a higher density (colder heat medium) for

Cylinder outer wall and the lower density portions (warmer

Heat medium) are pushed towards the cylinder inside. This separation can be reduced or avoided by the targeted arrangement of corresponding elements, which lead to a flow displacement of the heat medium in the flow cross section.

According to a further embodiment of the present invention, the temperature-controllable surface is finished, preferably hardened, chrome-plated Surface pores closed, plasma processed, laser processed and / or coated.

According to a preferred use of the roll according to the invention, the temperature-controlled surface in operation has a surface temperature between 35 ° C and 350 ° C, preferably between 70 ° C and 140 ° C or 90 ° C to 160 ° C and in particular between 90 ° C and 140 ° C on.

According to a further, particularly preferred embodiment of the multi-walled cylinder, the heating or cooling medium is liquid and / or gaseous and

preferably selected from the group consisting of hot air, water vapor, steam, water, hot water, hot water, salt solutions, brines, liquid

Hydrocarbon compounds such as alcohols, glycols, glycerol, esters, ketones, fats or oils such as natural or synthetic oils, mineral oil, stlicone oil, thermal oil, low-melting metals or metal alloys with melting temperatures below 300 ° C, such as Galinstan, Cerrolow, sodium -Calmium compounds, Wood's Metal, Field's Metal! or bismuth alloys, gaseous and / or liquid hydrocarbon compounds, or combinations thereof.

According to a further particularly preferred embodiment of the present invention, the outer diameter of the cylinder is in particular greater than 1.4 m and less than 10 m or more than 2.4 m and less than 6.6 m and preferably between 3.4 m and 5.6 m. Furthermore, the wall thickness of the outer sheath 1% to 50%, preferably 5% to 45% and in particular about 35% of the wall thickness of

Inner shell or the wall thickness of the outer shell 0.02% to 6%, preferably 0.03% to 3% and in particular 0.04% to 2.2% of the

Outside diameter amount. Alternatively, the wall thickness of the outer shell can also be 0.6% to 2000% of the wall thickness of the inner shell.

The feeding and removal of the heat medium into the flow channels of the cylinder according to the invention can be carried out according to a further preferred embodiment, in particular axially, radially and / or tangentially. It can also be distinguished between the supply and discharge side and the other side of the cylinder. Alternatively, the supply can also be on one side and the discharge on the other side. It can also be used on both sides. and discharges be arranged together. Furthermore, the heat medium in the synchronization principle, in the mating principle, cross flow principle, as a fitting system, as a multi-pass system or combination of the aforementioned can be performed.

In addition, it is known in steam-heated cylinders in the paper and board industry that they heat up strongly on the edge regions not covered by the web, because there is no or no sufficient heat dissipation there. This leads to a relatively strong Aufbombierung these areas. Among other things, for this reason, it is within the meaning of the present invention to make the introduction of the heat medium in an area where the web begins on the cylinder and the heat transfer medium is guided only in the area in which rests the web. Thus, the flow channels do not necessarily have to be led to the pin to feed there the heat medium or dissipate. The connection between feed and discharge can

For example, via hoses and / or pipelines made from the journal base, so that in particular the cylinder is heated only in the region of the web. The heating can also be adapted to different web widths via adjusting devices.

According to another embodiment of the present invention can

be taken into account that a corresponding cylinder under

Temperature influence relatively strongly deformed. Proceeding from this, it is within the meaning of the present invention that the corresponding cylinder, for example, is ground hot to at least the edge Aufbombierung (thermal

Aufbombierung) to remove. Subsequently, it can also be provided that corresponding cylinders are reheated and weighed warm.

According to a further particularly preferred embodiment of the present invention, the spigot / the side cover of the

Cylinder made of steel or cast steel, since this particular the

Elongation of the components is manageable.

The object of the present invention is also achieved by a method for

Production of the multi-walled cylinder according to the invention for drying and / or mechanical treatment of sheet material webs solved, comprising the following steps: providing a cylindrical outer shell with a temperature-controllable surface; Arranging at least one

Flow channel section below the temperature-controllable surface; Providing a connection area adjacent to the inside of the outer shell; Arranging an inner shell and its material, positive and / or non-positive fixation with the outer shell by means of the connection area.

In the context of the present invention, the provision of a cylindrical outer jacket with a temperature-controllable surface is understood to mean a

Outer sheath can be made available on soft material web and a direct transfer of thermal energy from one

Heat medium such as water vapor via flow channels to the temperature-controllable surface and from there then to the web for drying derselbigen to transfer.

The provision of a concentrically arranged in the outer jacket

Inner shell allows, for example, the outer shell thereof is constructively supported or supported, so that the design, strength and

Concentricity properties of a cylinder can be optimized. Alternatively, however, the inner jacket can also have other functions, such as, for example, the insulation of the flow channels to the interior of the cylinder or else a corresponding volume for improving the bending stiffness of the cylinder. The provision of a connection region makes it possible, for example, for the cylinder to be structurally reinforced, for example with reinforcements, and thus mechanically stiffer, and / or that in the

Connection area Isolation possibilities exist, with which thermal energy can be effectively concentrated on the temperature-controllable surface, where the energy for the drying of a material web is needed.

Alternatively, an insulating region can also be independent of the arrangement of the

Be provided connecting portion and be provided, for example, when shrinking and soldering or sintering of the outer cylinder on the inner shell on the inside of the inner shell for inner insulation. In this embodiment, it is then particularly advantageous that the flow channels in the region of the outside of the inner shell or in the region of the inside of the outer shell are incorporated and completely formed by the bonding process and sealed to the connection area.

The invention is also achieved by an alternative method for producing a multi-walled cylinder for drying and / or mechanical treatment of flat webs, in which the outer shell by a

Tube bundle, in particular by a welded Rohrbündei is formed. Here are the ones used to form the inner shell or outer shell

Tube bundles at least partially the flow channels for the heat medium ready. The method preferably used for this comprises the steps of providing a cylindrical outer sheath by welding a

Tube bundle, i. a plurality of tubes, which form the circumference of a cylinder by their arrangement, the placing of a temperature-controllable surface on the outside of the tube bundle and the placing of an inner sheath or

Support structure, preferably in the form of arranged on the outer shell components, such as sheets, strips or profiles.

The connection of the outer shell with the inner shell by at least one cohesive connection allows for a drive of the cylinder as

For example, via a center axis, the transmission of a rotation on the outer surface of the cylinder. A variety of the aforementioned selection

Connectivity allows a targeted influence on the

Cylinder characteristics such as strength, stiffness, weight, running time, etc.

According to a further, particularly preferred embodiment of the

A method according to the invention is applied to the inside of the outer jacket and / or the outside of the inner jacket by a connecting means, for example an adhesive or solder for the material-locking connection of the outer jacket to the outer jacket

Inner jacket applied in the connection area.

For this purpose, additional grooves, channels, grooves and the like may be provided in particular to improve the shape or material bond. As a result of the design, the inner casing is thus surrounded by the outer edge of the cylinder and, for example, the connecting means before the joining of two Cylinder already applied and / or is introduced after the cylinders are aligned

According to a further, particularly preferred embodiment of the

The method according to the invention is the connecting means according to the

Assembling the outer and inner shells to form the integral connection, e.g. activated by temperature.

Under activated in the sense of the present invention is understood, for example, a thermal, a chemical, a pressure mechanical, a radiation energy activation. The type of activation depends on each

Connection and the connecting means, so for example, in an adhesive or polymer as a connecting means, the connecting means with

Heat supply or activated by the supply of radiation energy and thus harden or crosslink and produce a cohesive connection between the outer and inner shells. In the case of sintered connections, the activation could take place, for example, by increasing the temperature and then cooling, in the case of vulcanization activation takes place, for example, under the influence of the parameters of time, temperature and pressure.

According to a further, particularly preferred embodiment of the

The outer jacket is shrunk or welded onto the inner jacket according to the invention. Furthermore, according to another

preferred embodiment, the connection area also by the

Inner shell are formed, in which case the inner shell and the

Connecting region are preferably formed integrally. In addition, it is also an object of the method that this has in other embodiments, steps such as the machining of the surface or the balancing of the cylinder with.

Alternatively, it is also within the meaning of the present invention that the

Outer jacket is formed with the connecting portion and in particular the outer sheath is formed integrally with the connecting portion.

According to a further preferred embodiment of the multi-walled cylinder according to the invention for drying and / or mechanical treatment of flat material webs of the inventive multi-walled cylinder for the production of paper, cardboard and / or cardboard and preferably of at least one side smooth paper, cardboard and / or cardboard is used.

Further aspects of the invention will become apparent from the following detailed description of possible embodiments of the invention in conjunction with the drawings and the claims. It should be noted that these examples include modifications or additions as they are immediately apparent to the person skilled in the art. Moreover, the preferred embodiments do not limit the invention so that modifications and additions are also within the scope of the present invention. It shows:

1 shows a first embodiment of a schematic wall structure of the multi-walled cylinder according to the invention;

Fig. 2 shows an alternative embodiment of the cylinder of Fig. 1;

3 shows a second embodiment of a schematic wall structure of the multi-walled cylinder according to the invention;

Fig. 4 shows an alternative embodiment of the cylinder of Fig. 3;

5 shows a third embodiment of a schematic wall structure of the multi-walled cylinder according to the invention;

Fig. 6 shows an alternative embodiment of the cylinder of Figure 5;

Fig. 7 Assembled jacket examples with insulating layer and external heating;

8 shows a system sketch of the multi-walled cylinder according to the invention with an internal journal;

9 system sketch of the multi-walled cylinder according to the invention with outside and inside pin;

10 shows a system sketch of the multi-walled cylinder according to the invention with an outer pin; 11 sketch for the lateral feed or return of a

Heat medium;

12 shows a sketch for the radial feed or return of a heat medium;

13 shows a detailed view of the possibilities of forming the flow channels; 14 shows a sketch of a further preferred embodiment of the present invention

Invention;

Fig. 15 plan view of a preferred embodiment of the invention

multi-walled cylinder;

Fig. 16 perspective view of the embodiment of Figure 15; Fig. 17 partial sectional view of the embodiment of Figure 15 along the line

Fig. 18 partial sectional view of the embodiment of Figure 15 along the line D-D.

Fig. 1 shows an embodiment of a schematic wall structure of the multi-walled cylinder according to the invention. Shown is the outer jacket 1 with a temperature-controllable surface 3 and an inner inner shell 2. Between the inside of the outer jacket 1 and the outer side of the inner shell 2, a connection region 4 is arranged, for example, hatched as an insulating and / or stiffening layer. On the outside of the inner shell strips 7 and head bolts 9 are arranged, which, for example, on the

Inner jacket can be welded. The connecting portion 4 fixes the outer 1 with the inner shell 2 non-positively and / or materially. To strengthen the connection and the stiffening further stiffeners 7 and / or head bolts 9 protrude into the connection region 4. On the inside of the outer jacket 1 flow channels 6 are arranged for a heat medium 5, which are formed, inter alia, by the wall 10. The wall 10 is in this case formed as a half-shell and connected in a fluid-tight manner to the inside of the outer casing 1. Thermal energy can be supplied via the heat medium 5 in the flow channels 6, for example be and transferred to the outer shell 1 in particular the temperature-controllable surface 3. With the function as an insulating layer of the connection region 4, the transmission of thermal energy to the temperature-controlled surface of the

Encourage outer sheath and reduce energy losses.

Fig. 2 shows an alternative embodiment of the invention

multi-walled cylinder, in which the stiffeners 7 and head bolts 9 are arranged both on the inside of the outer cylinder 1, and on the outside of the inner shell 2. Further, the flow channels 6 for the heat medium 5 are incorporated in the wall of the outer shell 1 in the form of half-round grooves, which are covered by the walls 11 fluid-tight with respect to the connection region 4, provided that the connection region or the process parameters {z. Temperature, pressure) require this. Alternatively, the connection region 4, the

Take over the limit function. The walls can be made in one piece or in several parts. The other components of the cylinder correspond with their reference numerals substantially to the embodiments of FIG. 1.

In Fig. 3, another embodiment of the multi-walled cylinder according to the invention is shown, in which the outer cylinder 1 is connected directly to the inner shell 2 and the flow channels 6 are incorporated as a semicircular grooves in the outer side of the inner shell 2. By merging the two cylinders 1 and 2, the flow channels 6 are sealed fluid-tight. This can

For example, by shrinking or a similar method. On the inside of the embodiment shown in Figure 3, an insulating layer 12 is applied to reduce energy losses in the interior of the cylinder. This insulating layer is optional for the illustrated example.

Fig. 4 is an alternative embodiment of the cylinder according to Fig. 3, in which the essential difference is the arrangement of the flow channels. Thus, in this embodiment, the flow channels 6 are located in the jacket of the outer cylinder 1, whereas, on the other hand, the essential flow channel sections in FIG. 3 lie in the inner jacket 2.

FIGS. 5 and 6 show a further alternative embodiment of the invention

multi-walled cylinder according to the invention, in which the flow channels 6 are designed as tubes, which are approximately half in the outer shell and the other half are integrated in the connection area 4. In FIG. 5, connecting elements 9 and 7 are provided both by the inner casing 2 and on the inner side of the outer casing 1. The connection region 4 can in this case in addition to the connection function between the outer and inner jacket also an insulating function and as

Stiffening layer to be understood. In particular, in the stiffening layer, the strips 7 and the head bolts 9 between the outer and inner shells are used to improve the connection and possibly also to improve the

Bending stiffness of the cylinder. In the embodiment of Figure 6, these fasteners are provided only on the outside of the Innenmanteis. Reference numeral 5 denotes the heat medium which can flow in the flow paths.

FIG. 7 shows examples of the different construction of the jacket, in particular with insulation and external heating (such as drying hoods). Reference numeral 12 denotes an external heating source, 1 the outer jacket, 4 the connecting region and 2 the inner jacket , It can the

Embodiment in which the flow channels are not shown, the insulating layer integrated both in the connection region 4, and be arranged as a separate layer 13. Furthermore, the connection region with the inner jacket can also be designed as a structural unit, as indicated in reference numerals 4/2 and 2/4.

FIGS. 8 to 10 show system sketches of the multi-walled cylinder according to the invention with differently shaped and arranged pins or the cover connected thereto. In this case, Figure 8 shows a version in which the pin 22 and the lid 21 connected thereto are arranged lying inside in the jacket 20 of the cylinder, wherein the jacket according to the present

Invention of at least two walls - as shown for example in Figures 1 to 4 - is constructed and the temperature-controllable surface 23 has. By means of the supply line 24 (flow direction according to the arrow 28), the hot heat medium is supplied via flow channels and discharged via the line 25 and correspondingly in the direction of the arrow 29. FIG. 9 shows an alternative

Solution in which the lid 26 with the pin 22 both inside and outside (side) of the cylinder wall 20 is arranged. Finally, FIG. 10 shows the version in which the cover 27 is exclusively on the outside, ie laterally to the side Cylinder wall 20 is arranged. The further reference symbols essentially correspond to the explanations regarding FIG. 8.

Figures 11 and 12 show schematic diagrams for the lateral and radial

Feeding the heat medium into the Strömungskanäie. Thus, via the pin 22 and the supply line 28 hot heat medium is supplied into the flow channels 33 and discharged via the line 29, wherein in FIG.

efferent lines laterally e.g. are arranged in the region of the cover 27 and in FIG. 12, these supply and discharge lines 28 and 29 are connected radially from the inside to the flow channels 33. The flow channels shown are shown axially in this schematic diagram, which of course can also be arranged radially, spirally or the like. Reference numeral 30 designates the outer cylinder and the reference numeral 31 designates the inner jacket, which are connected to one another in a materially cohesive manner via the connecting region 32, but possibly also non-positively and / or positively, in particular non-rotatably.

FIG. 13 shows five different design possibilities for the flow channels (which are not necessarily to be combined with each other), in which these can be partially filled (in the case of fluid heating) or completely (with complete external heating) with, for example, insulation material. In this case, in addition to the basic shape of the flow channels in the outer shell 1, the possibly provided wall 11, the insulating material 40 and the heating medium 5 are shown schematically.

FIG. 14 shows a further particularly preferred embodiment of the present invention, in which a weld layer 50 for forming the outer jacket and the temperature-controllable surface 52 is arranged on the outer side of the tube bundle 54 forming a cylindrical basic body. In this case, in particular with the welding layer 50, a shell structure is produced, which according to the corresponding

Processing provides the necessary surface structure. Of course, it is also within the meaning of the present invention that on the outside of the

Welding a further layer or surface structure possibly also another coat is applied.

In addition to the tube bundle 54 and the weld layer 50 for forming the outer jacket, at least one ring stiffener 53 is arranged on the inside, in particular for stabilizing and / or stiffening the cylinder structure, which is constructed according to the present invention illustrated embodiment, a plurality of tubes 51 of the tube bundle 54 connect, but not necessarily must be designed as a full-surface cylindrical inner shell. With appropriate dimensioning of the tube bundle 54 and their

Connection can if necessary. The annular stiffener 53 can also be dispensed with. FIGS. 15 to 18 show a preferred embodiment of the invention

According to the invention, a multilayer cylinder in which a pipe construction 64 forms the flow channels for the heat medium 5. In this case, in a first embodiment of this embodiment, a tube bundle i. a plurality of tubes 64 welded to form a cylinder circumference and then by a

Abrasion tion the surface 67 formed. On the inside of the cylinder circumference formed by the tubes, i. the outer sheath are in one

arranged predetermined distance ring strip 62, which optionally have recesses 63, around the outer cylinder shell formed by the tubes 64 in the sense of a support structure formed as a section-wise inner shell

stabilize. In this case, the support structure, inter alia, have the recesses 63, in which guide, stiffening ungs or mounting elements can be arranged and / or have a further inner cylinder or cylinder section 68.

According to a further embodiment of this embodiment, but also the flow channels can be provided by bores in an outer cylinder wall, which is preferably peripherally and near the outer wall, i. the temperature-controllable surface 61 are arranged.

According to a further embodiment of this embodiment can in

Region of the annular strip 62 of the inner cylinder additionally a potting compound or compound compound are arranged, which optionally also provides insulation.

FIG. 15 shows a plan view of this embodiment, in which not only the end faces 69 but also the temperature-controllable surface 61 can be seen.

Figure 16 also shows a perspective view of the embodiment of a cylinder 60 of Figure 15, in which in addition to the outer shell and the

Stiffening structures 62 with the recesses 63 for the leadership or

Stiffening unsei to be recognized. These stiffening structures are radial arranged circumferentially on the inside of the outer shell and thus form according to the present invention, an inner shell.

FIG. 17 is a section of a longitudinal section of the embodiment according to FIG. 15 along the line E - E, in which an outer tube in FIG

Longitudinal section 64 with the tube jacket 64 'and the temperature-controllable surface 61 can be seen. Furthermore, in this sectional view, the

Stiffening structures 62 shown with the recesses 63 of the inner shell. FIG. 18 shows a detailed partial sectional view of the embodiment according to FIG. 15 along the lines D - D. Here, the reference numerals 61 refer to the temperature-controllable surface of the outer jacket with the welded-on outer layer 67 and 64 on the multiplicity of flow tubes which together with the

Weld 65 and the welded-on outer layer 67 form the outer jacket. For this purpose, the tubes u.a. connected by the weld 65 and obtained by the welding of the outer layer 67, the outer surface. If necessary, a coating such as a chrome surface can also be applied to this surface. On the inside of the

Outer jacket is shown in this illustration, a segment of the stiffening structure 62. On the inside is according to the one shown here

Embodiment, a further inner cylinder 68 is arranged, whereby a

closed space can be provided in the region of the inner shell.

Claims

claims

1. Multi-walled cylinder for drying and / or mechanical treatment of flat material webs, in particular a Yankee cylinder,

Drying cylinder and / or heating cylinder, which has an outer jacket (1, 30, 50) with a temperature-controllable surface (3, 52) and an inner jacket (2, 31, 53), wherein below the temperature-controllable surface (3, 52) flow channels (6 , 33) are arranged, in which a heat medium (5) can be guided, characterized in that the cylinder has a connection region (4) between the inside of the outer shell (1, 30, 50) and the outside of the inner shell (2, 31, 53), which fixes the outer jacket and the inner jacket cohesively.

Multi-walled cylinder for drying and / or mechanical treatment of flat webs, according to claim 1, characterized in that the outer jacket (1, 30, 50) has an outer zone, which between 1, 5 mm and 72 mm, in particular between 5 mm and 15 mm thick and includes at least parts of the temperature-controllable surface (3, 52).

Mehrwandiger cylinder for drying and / or mechanical treatment of sheet-like material webs, according to claim 2, characterized in that the wall thickness of the outer sheath (1, 30, 50) 0.6% to 2000% of

Wall thickness of the inner shell (2, 31, 53) is.

Multi-walled cylinder for drying and / or mechanical treatment of sheet material webs, according to one of the preceding claims, characterized in that the thermal conductivity of the outer sheath (1, 30, 50} is greater than that

Thermal conductivity of the inner jacket (2, 31, 53).

Multi-walled cylinder for drying and / or mechanical treatment of sheet material webs, according to one of claims 1 to 4, characterized in that the flow channels (6, 33) through bores, in particular axial

Holes in the outer jacket (1, 30, 50) and / or inner jacket (2, 31, 53) are provided.

Multi-walled cylinder for drying and / or mechanical treatment of flat material webs, according to one of claims 1 to 4, characterized in that the Innenmantf (2, 31, 53) and / or the outer jacket (1, 30, 50) by a tube bundle, is formed in particular by a welded tube bundle, which also provides the flow channels (6, 33).

Mehrwandiger cylinder for drying and / or mechanical treatment of sheet material webs, according to one of the preceding claims, characterized in that in the edge zone of the outer shell (1, 30, 50) and / or the edge zone of the inner shell (2, 31, 53) and / or flow channels, in particular flow tubes are arranged in the region of the connection region (4).

Multi-walled cylinder for drying and / or mechanical treatment of sheet material webs, according to one of the preceding claims, characterized in that the inner edge provides a support structure for the outer jacket, which preferably forms portions of a jacket, and in particular

Recesses, recesses and / or areas of a cylinder jacket and / or that the Innenmantei or the support structure of individual, arranged on Außenmantei components, such as sheets, strips or profiles is formed.

Multi-walled cylinder for drying and / or mechanical treatment of sheet material webs, according to one of the preceding claims, characterized in that below the flow channels (6, 33) of the cylinder insulation (13) is provided.

0. Multi-walled cylinder for drying and / or mechanical treatment of sheet material webs, according to one of the preceding claims, characterized in that the temperature-controllable surface (3, 52) finished, preferably hardened, chrome-plated, the surface pores closed, plasma processed, laser processed and / or coated.

1. Mehrwandiger cylinder for drying and / or mechanical treatment of sheet material webs, according to one of the preceding claims, characterized in that the temperature-controlled surface (3, 52) in operation, a surface temperature between 35 ° C and 350 ° C, preferably between 70 ° C and 140 ° C or 90 ° C to 160 ° C and in particular between 90 ° C and 140 ° C. Multi-walled cylinder for drying and / or mechanical treatment of sheetlike material webs, according to one of the preceding claims, characterized in that on the inside of the outer casing (1, 30, 50) and / or on the outside of the inner casing (2, 31, 53) Connecting elements (7, 9) are provided, which preferably protrude into the connecting region (4).

3. Multi-wall iger cylinder for drying and / or mechanical treatment of sheet material webs, according to one of the preceding claims, characterized in that the material-locking fixing is carried out with a method or material which is selected from a group, the gluing, vulcanization, sintering, Soldering, welding, spot welding, filling, potting, grouting, mineral potting compounds, plastic-based potting compounds, adhesives, solders and / or polymer compounds, in particular with reinforcing elements such as natural, plastic-based, mineral and / or metallic fibers and / or reinforcements and combinations thereof and the like and in particular the connecting region (4) between the inside of the outer jacket and the outside of the Trägerermanteis a

Polymer compound which is selected from a group which in addition to copolyester other materials such as duro- and

thermoplastic and in particular polyphenylene suifid,

Polypropylene, poly-1-butene, polyvinyl chloride, polyvinylidene chloride, polymethyl methacrylate, polyacrylonitrile, polystyrene, polysulfone, polyacetal,

Polyvinyl alcohol, polyvinyl acetate, ionomers, fluoroplastic, polyethylene, polyamide, in particular a partially aromatic polyamide, polycarbonate,

Polyester, copolyester, polyphenylene oxide, polysulfone, polyvinyl acetate, polyurethane, and chlorinated polyether, cellulose nitrate, cellulose acetate, cellulose ether, phenolic resin, urea resin, thiourea resin, melamine resin, alkyl resin, allyl resin, silicone, silicone rubber, rubber, polyimide, Polybenzimidazole, Epoxy, Casein, Liquid Crystaf Polymers (LCP), Thermosetting compounds, Crosslinked Polyurthane, Polyvinylchloride, unsaturated polyester resin, fiber reinforced plastics, and combinations thereof and the like or solder, sintered material, and combinations thereof, and the like, or metallic, plastic-based or mineral potting compounds, injection-molding plastics, and combinations thereof, and the like.

Multi-walled cylinder for drying and / or mechanical treatment of flat webs, according to one of the preceding claims, characterized in that the heat medium (5) is liquid and / or gaseous and is preferably selected from a group which hot gases and liquids, in particular hot air , Steam, steam, water, hot water,

Hot water, saline, Sofe, liquid hydrocarbon compounds such as alcohols, glycols, glycerol, ketones, esters, fats or oils such as natural or synthetic oils, mineral oil, silicone oil, thermal oil, low-melting metals or metal alloys with melting temperatures below 300 ° C, such as For example, Gaiinstan, Cerroiow, liquid metals such as sodium-potassium alloys, woody metal, Fields metal or bismuth alloys, gaseous and / or liquid

Hydrocarbon compounds and / or combinations thereof.

15. Multi-walled cylinder for drying and / or mechanical treatment of sheet material webs, according to one of the preceding claims, characterized in that the outer diameter of the cylinder is greater than 1, 4 m and less than 10 m, in particular greater than 2.4 m and less than 6.6 m and is preferably between 3.4 m and 5.6 m and / or the wall thickness of the outer sheath (1, 30, 50) 0.015% to 6%, preferably 0.03% to 3% and in particular 0.04% to 2.2% of the Outside diameter is.

6. multi-walled cylinder for drying and / or mechanical treatment of sheet material webs, according to one of the preceding claims, characterized in that the connecting region (4) and the inner shell (2, 31, 53) and / or the outer casing (1, 30, 50).

A multi-walled cylinder for drying and / or mechanically treating sheetlike material webs, according to one of the preceding claims, characterized in that the heating of the temperature-controllable surface (3, 52) is effected or assisted by an external energy source (12), e.g. Induction,

Combustion, hot air, superheated steam, radiation, infrared can be.

8. Process for the production of a multi-walled cylinder for drying

and / or mechanical treatment of flat webs according to one of claims 1 to 5, comprising the steps of:

- Providing a cylindrical outer shell (1, 30, 50) with a

temperature-controlled surface (3, 52)

Arranging at least one flow channel section below the temperature-controllable surface (3, 52);

- Providing a connection area following the inside of the outer shell (1, 30, 50);

- Arranging an inner shell (2, 31, 53) and cohesive fixation thereof with the outer jacket (1, 30, 50) by means of the connecting region (4). Method for producing a multi-walled cylinder for drying and / or mechanical treatment of flat film webs according to claim 6, comprising the steps:

- Providing a cylindrical outer shell (1, 30, 50)

Welding a tube bundle;

Arranging a temperable surface on the outside of the

Tube bundle;

- Arranging an inner mantle (2, 31, 53) or support structure, preferably in the form of arranged on the outer shell components, such as sheets, strips or profiles.

A method according to claim 18 or 19, characterized in that on the inside of the outer sheath (1, 30, 50) and / or the outer side of the inner sheath (2, 31, 53) a connecting means for cohesive connection of the outer sheath with the inner sheath in the connecting region ( 4)

is applied.

A method according to claim 18, characterized in that the outer jacket (1, 30) on the Innenmante! (2, 31) shrunk or welded.

Method according to one of claims 18 to 21, characterized in that the inner region (2, 31, 53) and / or the outer casing (1, 30, 50) is formed with the connection region (4), and in particular the inner casing and / or the inner casing Outer jacket (1, 30, 50) is formed integrally with the connecting portion.

23. The method according to any one of claims 18 to 22, characterized in that the outer sheath (1, 30, 50) is processed for adjusting the wall thickness of the outer zone and / or for refining the surface.

24. The method according to any one of claims 18 to 23, characterized in that in the cylinder one or more balancing masses are introduced.

25. Use of a multi-walled cylinder for drying and / or

mechanical treatment of flat webs according to one of claims 1 to 17 in the production of tissue, paper, cardboard and / or cardboard and preferably of tissue and / or at least one side smooth paper, cardboard and / or cardboard.