WO1997027926A2

WO1997027926A2 - Coilable separation elements and suitable housing with coiling drive

Info

Publication number: WO1997027926A2
Application number: PCT/EP1997/000398
Authority: WO
Inventors: Jürgen Hoffmann
Original assignee: Steinbeis Gessner Gmbh
Priority date: 1996-02-01
Filing date: 1997-01-29
Publication date: 1997-08-07
Also published as: WO1997027926A3; DE19603622A1

Abstract

The invention concerns improved coilable separation elements (10), an appropriate coiling process as well as an appropriate housing (3) with toothed gearing (14, 14', 15, 6). The coiling process ensures that during coiling no harmful tension is exerted on the separation tube (17) of the separation element (10). Together with optimised technical separation features, the separation element (10) is stabilized for the coiling process additionally due to the fact that the separation tube (17) is pre-formed already in a curved shape and/or the axial loops are effected in a very stable manner.

Description

description

Wrapped separation elements and suitable housings with a wrapping gear

The invention relates, for. B. for the regeneration of

Separation medium (7, 7 ') wrapped separation elements

(10) for the treatment of liquid or gaseous media which contain tubular separation media (7, 7 '), which are surface-active and / or porous, and housings (3) with specific devices in which these separation elements

(10) can be operated.

Such separation or filter elements (10) z. B. in the European patent application EP 0626192 of the applicant, in DE 1 301 797, FR 2 218 126 and DE-OS 23 24 229 discloses.

Separation media (7, 7 ') in the sense of the invention are generally referred to as filter media. In this publication, the term separation media is preferably used to underline that a flow is not absolutely necessary for its effect, but the interaction can also take place with simple media contact through adsorptive, chemical, catalytic, capillary (suction) or other mechanisms.

The windable separation elements (10) according to the invention mainly consist of separation units (18) which contain the separation media or the separation media (7, 7 ', ..). The separation media (7, 7 ') are based on their pore size or separation limit properties (coarse, fine, micro, ultrafiltration and reverse osmosis), their separation mechanism (sieve, depth filtration, adsorptive Filtration, pervaporation, vapor permeation, gas separation ..) and their interaction with the medium to be treated (specific and non-specific adsorption, chromatography, catalysis, ion exchange, capillary action, electrical action ..). The separation media (7, 7 ') can thus act both as a barrier and as an adsorber and reaction area or reaction volume for certain constituents of gas mixtures, aerosols, liquid mixtures, solutions and colloidal and particulate suspensions.

In a variant relevant to the present application, the separation element (10) consists, for. B. from a tubular separation unit (18)

Axis connections (13, 13 ') to the axes (4, 4') if these axes (4, 4 ¹ ) do not belong to the separation element (18) or from a tubular separation unit (18) whose ends are fixed to the axes (4, 4 ') are connected. The axes (4, 4 ') are axes of rotation which can simultaneously be medium discharge axes or medium supply axes for the medium to be treated.

The axes (4, 4 ") can thus belong both to the housing (3) and to the separation element (10). The axes (4, 4 ') are connected to the housing (3) via an axis connection (13, 13' ), which ensures that the axes can be driven in both directions.

The majority of the separation unit (18) or the separation hose is usually located during the separation

(17) as a winding (1) on an axis (4). To z. B. to carry out a regeneration, this winding (1), optionally with the separation of layers of the separation units

(18), can be rewound onto the other axis (4 ') and, if necessary, rewound again. The wrappable separation unit

(18) consists of a flat separation tube (17) Side edge seals (16, 16 '), which is formed from the separation medium (7) by gluing or welding the side edges. This separation hose (17) contains an internal drainage (9) inside. One or two external drainage pipes (8, 8 ') can be located on the outside of the separation hose. All components together make up the separation unit (18).

During cold sterilization of beer, the separation medium (7,7 ') is e.g. a microfilter and the regeneration unit (2) with which the filter surface is cleaned during the wrapping process, an ultrasonic tube resonator. In production plants, there are usually several separation elements (10) in a filter housing (3), arrangements being preferred which allow a regeneration unit (2) to interact with several separation elements (10). For regeneration, the beer is pushed out and the housing (3) filled with warm water. Then each separation element (10) individually or several or all together over drives on the housing base, which set the axes (4) or (4 ') in motion, so that each section of a filter hose (17) is washed free of water and can interact directly with the ultrasonic tube resonators (4).

In practice, it has now emerged that the construction of the separation element (10) and its drive via the axes of rotation (4, 4 ') must be improved.

The problem thus arises that as much filter surface as possible has to be accommodated in a separation element (10). The filter area is proportional to the length of the separation hose (17). Long drainage paths in the separation hose (17) not only mean an increased pressure loss, but also have the consequence that with increasing separation hose length due to the curvature-related length offset between the inside and outside of a wound separation unit (18), the wrapping process is becoming increasingly difficult. Thicker inner drainages (9), which could counteract the pressure loss, on the other hand have the effect that, given a winding diameter, considerably less filter area can be accommodated without the winding problem being decisively mitigated, since particularly thick inner drainages (9) permanently impede the wrapping process.

Thick separation units (18) and long hose lengths (17) result in a considerable length offset of the layers from one another when wrapping, which leads to folds and tensions which can damage or destroy the separation element (10). The same occurs if a strong tensile force acts on the separation tube (17) or on the axle connections (13, 13 ') or the unwinding axle (4, 4') during the wrapping. In particular, the axis connections (13, 13 ') are then heavily loaded and can tear off or the abrasion of external drainages (8, 8') leads to snagging or destruction of the separation element (10). The frictional forces are often so high that the motor power for the axis drives is no longer sufficient and the motors fail due to overload.

The invention is therefore based on the object of further designing the construction of the separation elements (10) in such a way that, with an optimally usable filter surface, they easily pass from one winding axis (4, 4 ') to the other (4 , 4 ") can be wound and to develop a suitable winding method or drive principle for the axes (4, 4 ') of the separation elements of the type described above. These objects are achieved according to the present invention by the features specified in the characterizing parts of claims 1, 3 and 6. Advantageous training and further education are specified in the respective subclaims. Depending on the application-related design of the separation unit (18), each of the solutions according to the invention represents a practicable or adequate solution to the problem. However, the combination of solutions according to the invention is particularly advantageous.

Accordingly, the idea of the invention is that the separation hose (17) is not a plane, but in the side edge seals (16, 16 ') is a curved hose (17), the inside and outside of which have different lengths and or that the ends of the separation tube (17) are formed into compact axis loops (28, 28 ') into which the winding axes (4, 4') are integrated or into which the winding axes (4, 4 ') can be inserted and or that when the separation unit is wrapped around (18) from one winding axis (4, 4 ') to another (4, 4') the winding axis (4, 4 ') does not exert a strong pull on the unwinding axis (4, 4') or the axis connections (13, 13 ') and the separation unit (18) exercises. Such a drive can be implemented via a gear transmission.

The principles of the invention are explained in more detail with the aid of illustrations and special embodiments of the separation elements (10) and the corresponding housing (3) are outlined.

Show

Figure 1 and 2 cross sections through the separation unit (18) a separation element (10),

FIG. 3 shows a longitudinal section through a separation housing (3) with a regeneration unit (2) in which a separation element (10) according to the invention is installed,

FIG. 4 shows a cross section through a side edge seal (16) of a separation hose (17) made in spiral form, the

FIGS. 5 to 7 cross sections through axis connections (13, 13 ') and axis loops (28, 28'),

Figure 8 shows a preferred arrangement of three separation elements (10) and the associated arrangement of a gear transmission according to the invention and the

Figures 9A and 9B show a preferred arrangement of six

Separation elements (10) with the associated gear transmission.

The cross section of a separation unit (18) is shown in FIG. The shape of the tube is achieved in that the open edges of the separation medium (7, 7 ') via two side edge seals (16, 16') made of a flexible seal or adhesive, such as silicone or polyurethane, by direct welding or by welding with hot-melt adhesive films or hot-melt adhesive fleeces to one another are connected. The separation unit (18) consists of the separation hose (17) with the inner drainage (9) and the outer drainage (8).

The separation medium (7, 7 ') can consist of one or more layers, which, for. B. have different separation quality or it is z. B. a separation medium (7, 7 ') to stabilize one Fleece is supported or in which a support fleece is integrated. The two sides of the separation tube (17) can also consist of different separation media (7, 7 '), for example a hydrophobic and a hydrophilic microfilter or filters with different pore sizes.

Suitable inner drains (9) are e.g. fabrics, mesh grids, nonwovens or the like which are not very compact but are as open as possible, with structures which facilitate the drainage of the filtrate in the flow channel (11) in the direction of the winding or drainage axes (4, 4 '), d. H. keep the pressure loss at the filtrate drain as low as possible. The inner drainage (9) must also maintain these properties if z. B. the filtration pressure increases with increasing blocking of the separation medium (7, 7 ').

The external drainage (8) has the effect that the medium to be treated can penetrate into the winding (1) via the end face (5) and come into contact with the entire surface of the separation medium (7, 7 '). Materials suitable for the external drainage (8) are the same as for the internal drainage (9), but as a rule this does not always have to be so stable because the pressure load is lower.

FIG. 2 shows the cross section through a separation unit (18) with two outer drainages (8, 8 ') which are somewhat thinner than the outer drainage (8) in FIG. 1. Such an arrangement has the advantage, among other things, that the separation medium (7 , 7 ') on both sides of the separation hose (17) is better protected against mechanical damage.

The thickness of the entire separation unit (18) is decisive for how much filter area can be accommodated in the winding for a given winding diameter

REPLACEMENT BLAπ (RULE 26) can. The thicknesses of the drainages (8, 9), on the other hand, are decisive for the effective use of the entire filter area, with the lowest possible resistance for the media flow. Furthermore, the filtrate discharge resistance increases with the length of the separation hose (17). In the case of a constructive solution for an optimized winding behavior, such filter-technical aspects have to be considered.

Fig. 3 is a longitudinal section through a housing (3) which is equipped with a wound separation element (10) and a regeneration units (2). The largest part of the separation unit (18) is in the illustrated state as a winding (1) on the axis (4). It is connected to the axes (4, 4 ') via the axis connections (13, 13'). The axes (4, 4 ') can belong to the housing (3) or to the separation element (10). The deflection axes (20) ensure that an optimal interaction between the regeneration unit (2) and the separation unit (18) is possible.

If, for example, the axis (4) has a diameter of 40 mm, the width of the separation unit (18) is 500 mm and the thickness is 4 mm, in the initial state for the winding (1) with 14 wraps there is a diameter of 152 mm. If half of the surface is wound on both axes (4, 4 "), the diameter of the coils (1) and (1 ') is 111 mm each. If both sides of the separation hose (17) are active, the result is 14 Wrapping an area of 4.2 m2 and an average length of 4.2 m for the hose length With a thickness of the separation unit (18) of 8 mm and a given winding diameter of 152 mm, only 7 wraps of the axis (4) would be possible This corresponds to a length of 2.1 m and thus only half the filter area with 2.1 m2 compared to a separation unit (18) with the thickness of 4 mm.

The axes (4) and (4 ') can be moved manually or with an automatic drive continuously or stepwise in both directions. There are, however, a number of problems which have to be solved via the construction of the separation element (10) and the winding process.

If, for simplification, the cut surface is viewed through a spirally wound separation unit (18) as it is present in the winding (1) (compare FIG. 4) not as a spiral, but as nested concentric pipe cross sections, the pipes having the thickness d mm, is independent the radius of the inner circular arc is always 2 * TI * d millimeters shorter than the outer circular arc. This length offset is therefore the same size for each winding for a given thickness d, but it has a different effect for each winding because its circumference grows outwards. The smaller the circumference of a winding, the greater the percentage of the offset length. It is of course a starting point to work with axles (4, 4 ') that are as thick as possible. However, this means that, given the outer diameter of a winding (1), there is a considerable loss of separation area.

If a flat-made separation hose (17), ie a separation hose (17) with the cross section according to FIG. 1 or 2, in which all components of the separation unit (18) are of equal length, is wound around an axis (4), this results in one winding very many folds, whereby the formation of folds and the tension associated therewith is much greater for the inner windings than for the outer windings, since here the one given by the curvature Length offset must be accommodated on a smaller wrap circumference.

Figure 3 corresponds to an arrangement during the separation. For regeneration, the winding (1) z. B. by rotating the axis (4 '), based on the diameter, while the coil (l ¹ ) is to build up on the axis (4'). On the one hand, this results in the problem that the length offset problem described above is reversed exactly, ie the large winding radii with few folds become small winding radii with many folds. Damage to the separation hose (17) is preprogrammed during this process. In particular, the necessarily very stable inner drainage (9), which hardly allow wrinkles to form, cause strong tensions that lead to defects. Rotating the axis (4 ') causes additional problems. On the one hand there is a risk that the train on the axle connection (13 ') will become so strong that it will tear off or be damaged, on the other hand it happens that the windings of the winding (1) are pulled by the axle (4 ¹ ) not be unwound from the axis (4), but that the windings in the winding (1) slide over each other and the winding (1) is strongly consolidated (bandage effect). This tension makes it even more difficult to get a grip on the length offset effects described above and the probability increases that z. B. hook and tear off the external drainage (8, 8 ') or damage the separation medium (7, 7').

According to the invention, this overall problem is solved as follows by means of constructive measures and procedural measures so that a practical use of windable separation elements (10) of the type defined above is possible. Depending on the application-related design of the separation unit (18), those explained below inventive solutions each represent a practicable or adequate solution to the problem. However, a combination of the solutions according to the invention is particularly advantageous.

A first measure according to the invention to solve the problem is that the separation tube (17) is made in a curved shape. As shown schematically in FIG. 4, the radii of curvature preferably correspond to those in a full winding (1). Such a separation tube (17) cannot be laid out flat without a kink, because the length of the separation medium (7, 7 ') is shorter on the inside of the curvature than on the outside. For the above example with 14 coils of a separation unit (18) of 4 mm thickness in one coil (4), this means that the separation medium (7, 7 ') and the external drainage (8, 8') on the inside of the curvature by approx .350 mm are shorter than on the outside of the curve. The given curvature makes it possible to produce a compact output winding (1) at least on the axis (4). Together with the measure described later, there is still a gentler wrapping process. Furthermore, during the wrapping process, the curvature of the preformed separation tube (17) in arrangements as shown in FIGS. 7 and 8 ensures an optimal distance between the cleaning unit (2) and the separation medium (7, 7 ^» ).

A second measure according to the invention to solve the problem is that the connection to the axes of rotation (4, 4 ') is made very stable by the formation of preferably cylindrical axis loops (28, 28') at the ends of the separation hose (17) , so that there is no tearing or damage when tensile forces occur during a wrapping process.

REPLACEMENT SHEET (RULE 28) The connections shown in Figure 3 between the ends of the separation hose (17) and the axle connections (13, 13 ') illustrate that on the one hand strong tensile forces act on these connections when wrapping, on the other hand, the protruding axle connections (13, 13') complicate one concentric winding. There is also the risk of the separation hose (17) kinking.

Figure 5 shows a further variant of the connection of the separation hose (17) to the axes of rotation (4, 4 '). The separation media layers (7, 7 ") are connected here directly to the axis opening (21, 21 ') of the axis of rotation (4, 4') via the separation media (7, 7 '), forming the axis connection zones (22, 22'). This variant allows more concentric winding, but the risk of kinking and the high tensile load still exist.

Figure 6 shows a further variant in the prior art. The inner drainage (9, 9 ', 9') of the separation hose (17) is shortened and the separation media (7, 7 ") with the associated outer drainage (8, 8 ') are separated around the axis of rotation (4, 4') has several openings (21, 21 '), guided and connected to one another at the connection zone (23, 23'). The stability of this axis connection suffers on the one hand from the fact that the train acts directly on the usually very sensitive separation media (7, 7 ') , on the other hand, the connection zone (23, 23 ") and the kink zone (24, 24 ') are particularly heavily loaded during the wrapping process.

FIGS. 7A and 7B show a cross section through an axis connection according to the invention. In FIG. 7A, the cut is made in the middle of the separation tube (17), while in FIG. 7B the cut is shown through a side edge seal (16, 16 '). 7A is It can be seen that there is no direct connection here between the multi-perforated (21, 21 ') axis of rotation (4, 4'), but that the screwed-in end of the separation hose (17) itself forms an axis loop (28, 28 ') through the transverse sealing zone (25, 25 '), which extends across the entire hose width, is held in the mold. The transverse sealing zone (25, 25 ') furthermore ensures the strict separation between the fluid space outside and inside the axis loop (28, 28 "), so that, for example, a filtrate collected in the separation hose (17) passes through the without mixing with the unfiltrate Hose opening (29, 29 ') of the axis of rotation (4, 4') can be supplied.

The transverse sealing zone (25, 25 ') is produced by gluing, direct welding or welding using hot-melt adhesive films or nonwovens. For safety reasons, two or more transverse sealing zones (25, 25 ') can also be arranged one behind the other.

So that there is an improved distribution of the filtrate over the perforated (21, 21 ') axis of rotation (4, 4'), it can be advantageous to use at least some of the separation medium (7 ') and the external drainage (8') inside the Remove the axis loop (28, 28 '). This is advantageously done before screwing in the ends of the separation hose (17).

The section through the side edge seal (16, 16 ') of the separation hose (17) or an axis loop (28, 28') is shown in FIG. 7B. From this drawing it can be seen that the intertwined side edge seals (16, 16 ') inside the axis loop (28, 28') at the contact zone (inside) (26, 26 ') are leak-tightly connected to one another so that no filtrate can escape to the outside. In a preferred embodiment, the side edge seals (16, 16 ') are also firmly connected to one another along the outer contact zone (27, 27') outside the axis loop (28, 28 '). This has the advantage that tensile forces occurring during Umwiekel processes can never act on the transverse sealing zone (25, 25 ") itself.

If the axes (4, 4 ") belong to the separation element, the sealing zone (30, 30 ') between the axis loop (28, 28') and the axis of rotation (4, 4 ') is designed in such a way that a leak-proof and non-slip connection is created. The procedure is analogous if the axes of rotation (4, 4 ') are part of the housing (3), over which the, for example, cylindrical axis loops (28, 28 ") are placed when the separation element (10) is inserted. The connection of the axis loops (28, 28 ') to the axes of rotation (4, 4') must therefore be non-slip or positionally stable, so that there is no over-rotation when the separation hose (17) winds the same number of turns back and forth becomes.

A third measure according to the invention is to design the winding process during winding so that the axis (4, 4 ") on which the winding is to take place does not have any tension on the winding (1 ', 1) or the axis connections (13, 13') ) or the axle (4 ', 4), which means that both axles (4, 4') have to be driven and their speeds have to be adapted so that more and more unwound separation hose (17) is available as for the Winding is necessary.

DE-OS 23 34 229 describes a method which, at first glance, permits wrapping in which no tension is exerted on the winding (1, 1 ') or the axle connection (13, 13'). The procedure only works if the Drive belt has the same thickness as the filter belt and even then tensioning devices for length compensation are required. Neither is described in the publication. Furthermore, the method and the described devices have the aim that both axes of rotation (4, 4 ') move at different speeds, so that the same circumferential speeds result with different diameters of the filter belt reels. The filter belt should obviously always be kept taut. This contradicts the requirement that, when the separation elements (10) according to the invention are rewound, more and more separation tubes (17) are advantageously available, as is necessary for the winding.

This is possible without great effort if, for example, both axes (4, 4 ') rotate at the same speed. The fact that z. B. from the large outer winding (1) and wound on the almost empty axis (4 '), this feed is always given. This type of wrapping is also favorable for the necessary reversal of the curvature in the winding (1 ') that is being formed. Due to the large feed and the curved shape of the initial winding (1) described above, a winding is not formed on the winding axis (IM) immediately, but rather a large or loose winding, which becomes narrower in the radius only during the winding process and finally at the last one In a preferred winding process, this tightening is avoided by, for example, leaving 0.25 to 2 remaining rolls on the unwinding axis 4. If tightening is absolutely necessary for the separation process, the wrapping process becomes particularly important in the case of spirally produced windings (1) (measure 1, FIG. 4), such that the windings are wound back and forth, the windings (1) then have the optimum compactness for the separation. The two axes (4, 4 ') can be driven according to the invention if these axes of rotation (4, 4M) are connected to one another via gearwheels (14, 14', 15).

The axis gears (14, 14 ') of a separation element (10) are preferably connected via an intermediate gear (15), which ensures that both axes (4, 4') rotate in the same direction. In the case of a crossover winding, the problems of the length offset and the change in the curvature ratios would be exacerbated. The two axis gears (14, 14 ') preferably have the same diameter and the same number of teeth. This ensures that there are no tears or over-revolutions or uncoiled hose surfaces.

A preferred arrangement of three separation elements (18) and a regeneration unit (2) and the associated gearwheel gear is shown in FIG. To simplify matters, the gears (14, 14 ', 15) are shown as circular disks in contact. The regeneration unit (2), which e.g. on

Ultrasonic tube resonator acts simultaneously on both sides of the separation unit (18) of all three separation elements (10), which are shown as a double winding (1, 1 '), during the wrapping. Due to the transition gears (15), all axes (4, 4 ') rotate in the same direction. All axes (4, 4 ') are moved simultaneously and evenly via a drive or a drive gearwheel (6).

A further advantageous arrangement of the individual windings (1, 1 ') of six separation elements (10) is shown in FIG. 9A. Two double wraps (1, 1 *) each interact with a regeneration unit (2). Due to the opposite position of the separation elements (10), the dead volume or Size of the housing (3) can be reduced. Figure 9B shows schematically the associated gear transmission. In the inner gear rim, the axle gears (14, 14 ') mesh directly with one another and thus bring about the opposite movement of the axles (4, 4') of adjacent separation elements (10), while the two axles (4, 4 ') or the two axle gears (14 , 14M of a separation element (10) are connected via an intermediate gear wheel (15) and thus rotate in the same direction The number of winding elements or separation elements (10) and drive gear wheels (14, 14 ', 15) and the housing size can be changed without change easily adapt the basic principle to the required separation performance.

Reference character line

1, 1 t winding

2 cleaning unit

3 housing

4, 4 winding axes

5 winding face

6 drive gear

7, 7 ¹ 1 separation medium

8, 8l ^* external drainage

9 internal drains

10 separation element

11 drainage channel

13, 13 'axle connections

14, 14 'axis gear

15 intermediate gear

16, 16 'side edge seal

17 separation hose

18 separation unit

20 deflection axes

21, 21 'axis opening

22, 22 'axis connection zone

23, 23 'connection zone

24, 24 'kink zone

25, 25 'transverse sealing zone

26, 26 'contact zone inside

27, 27 'contact zone outside

28, 28 * axis loop

29, 29 'hose opening

30, 30 'sealing zone to the axis of rotation

Claims

1. Separation elements (10)

Treatment of liquid and gaseous media, the separation unit (18) of which is designed as a hose (17), which is fixed to two axes of rotation (4, 4M and wound on at least one of these axes (4, 4M) and for regeneration or for another purpose can be wound from one to the other axis (4, 4 '), characterized in that

that the Seperationsεchlauch (17) can not be designed flat without kink, but is a prefabricated with curvature hose (17), which has a shorter length on the inside of the hose than on the outside of the hose.

2. Separation element according to claim 1, characterized in that the prefabricated curvatures of the hose (17) correspond to those which have the individual turns when the separation hose (17) is fully wound on an axis (4, 4M).

Separation elements (10) with two axes of rotation (4, 4 ') for the treatment of liquid and gaseous media, the separation unit (18) of which is designed as a hose (17) which is fixed on two axes of rotation (4, 4') and at least on one of these axes (4, 4M is wound up and can be rewound from one to the other axis (4, 4M for regeneration or for another purpose, characterized in that

that the fixation to one or both axes of rotation (4, 4M via, formed from the ends of the separation hose (17), axis loops (28, 28 ') with any Cross-section takes place, in each case at least via a transverse sealing zone (25, 25 '), which extends over the entire width of the separation hose (17) and which ensures a strict separation of the fluid spaces in and outside the axis loop (28, 28') the desired shape.

Separation elements (10) according to claim 3, characterized in that the cross section of the inner opening of the sealing zone

(30, 30 ') to the axis (4, 4') is circular.

Separation elements (10) according to claim 3 or 4, characterized in that by forming a firm connection between the adjacent side edge seals (16, 16 ') in the outer contact zone (26, 26') any tensile load on the transverse seal zone (25, 25 ') is avoided becomes.

Wrapping method for separation elements (10) with two axes of rotation (4, 4 ') in which the winding axis (4, 4M does not exert any tension on the unwinding axis (4', 4) via the separation hose (17), characterized in that both axes of rotation (4, 4 ') of the separation element (10) rotate in the same direction and εich both axes of rotation (4, 4') rotate at the same speed.

7. Wrapping method for separation element (10), according to claim 6, characterized in that during unwinding at least a quarter turn of the separation hose (17) on the axis (4, 4 ') from which is unwound, remains.

8. Wrapping method for separation elements (10), according to one of claims 6 to 7, characterized in that there is a winding process back and forth

Housing (1) for separation elements (10) with two axes of rotation (4, 4 '), characterized in that the axes of rotation (4, 4') of the separation element (10) via gearwheels (14, 14 ', 15, 6) are driven.

10. Housing (1) for separation elements (10), according to claim 9, characterized in that the axle gears (14, 14 ') on the axes of rotation (4,4 ") are coupled via an intermediate gear (15) and thus in the same Turn direction.

11. Housing (1) for separation elements (10), according to claim 9 or 10, characterized in that the gears (14, 14 ') on the axes of rotation (4,4') are dimensioned the same and thus the axes (4, Rotate 4M at the same speed.

12.Housing (1) for separation elements (10) with two axes of rotation (4, 4 '), characterized in that in the case of housings (1) with a plurality of separation elements (10), one gear wheel (14, 14') each of an axis (4, 4M a separation element (10) engages in one gear wheel (14, 14 ') of one or more neighboring elements (10) or is connected to the latter via an intermediate gear wheel (15), so that several separation elements (10) can be wrapped simultaneously via a drive and a drive gear (6).