EP1415037A1

EP1415037A1 - Flexible press jacket and shoe press roll comprising such a flexible press jacket

Info

Publication number: EP1415037A1
Application number: EP02764679A
Authority: EP
Inventors: Uwe Matuschczyk; Andreas Meschenmoser; Joachim Grabscheid; Andreas SCHÜTTE
Original assignee: Voith Paper Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2001-08-06
Filing date: 2002-07-12
Publication date: 2004-05-06
Anticipated expiration: 2022-07-12
Also published as: WO2003014469A1; ATE327374T1; CN1539041A; JP2005503493A; DE50206913D1; CN1261642C; US20040173275A1; BR0212015B1; BR0212015A; EP1415037B1; JP4149920B2; US6932888B2; CA2456573A1; DE10138526A1

Abstract

A flexible press cover which has an additional strengthening element in at least one of its two end regions. As a result, in the end region, the tensile strength and the tensile rigidity in the circumferential direction are increased with respect to that hitherto known in such a way that it is no longer necessary to clamp the press cover end region in between two components. Instead, the press cover according to the present invention is suitable to be fixed to the outer circumferential surface of a rotatable supporting element belonging to the cover carrying disk without the aid of an outer ring, a clamping band, clamping filament or the like. In the most beneficial case, the arrangement for fixing the press cover to the aforementioned supporting element is completely free of any kind of fixing elements which would be associated with the cover outer surface.

Description

Flexible press jacket and shoe press roll with such a flexible

press cover

The present invention relates to a flexible press jacket which is intended for a shoe press roll. Such a shoe press roller is used for dewatering or smoothing a running fibrous web, in particular paper or cardboard web. The flexible press jacket comprises a plastic layer, preferably made of polyurethane, and as reinforcement a ("conventional") reinforcement embedded in the plastic layer. The reinforcement can be designed as a fabric; however, a so-called scrim is preferred, which comprises axially parallel longitudinal threads and wrapped circumferential threads Circumferential threads can be wrapped in the plastic layer on the outside of the longitudinal threads (see EP 0330680 = US 5134010, PH 04378). However, the reverse arrangement is also possible (see WO 95/29293, Tamfelt).

Reference is made to the following further publications relating to the state of the art:

D1 DE 3546650 C2, (PH 04164A), D2 DE 29702362, (PH 10287), D3 DE 19633543. (PH 10368).

As is known, a shoe press roll comprises a stationary support body. Two jacket support disks are rotatably mounted on this for the flexible press jacket. In addition, a radially displaceable press shoe is arranged on the support body, which can press the circumferential press jacket against a counter roll to form a press nip which is elongated in the web running direction. It is important that the press jacket and the jacket support disks, together with the support body, delimit a closed, liquid-tight interior. According to document D1 is to achieve a liquid-tight connection provided between the press jacket end area and one of the jacket support disks, to bend the end area radially inward and to be pressed against the outer end face of the jacket support disk with the aid of tensioning elements.

This arrangement has proven itself in practice. However, it is disadvantageous that a large number of recesses must be provided in the edge zone of the press casing, between which tongues are retained. Sometimes it is also difficult to get the press casing to run as accurately as possible.

According to FIGS. 3 and 4 of document D2, attempts have been made to avoid the deformation of the press jacket end region described in D1. Each of the two press jacket end areas retains the normal cylindrical shape, so that the production of recesses and tongues is omitted. It is intended to clamp the cylindrical press jacket end area between an internal expandable (i.e. diameter-expandable) expansion ring and an outer ring. However, such an outer ring is often troublesome because it is more difficult to replace a worn press jacket with a new press jacket.

According to FIGS. 2 to 4 of document D3, an annular circumferential groove is provided in the outer surface of a sheath support disk, into which the ring area of the press sheath is pressed, namely by means of a tension band or by means of several turns of a high-strength thread or by means of a shrink ring. If a cover provided according to FIG. 1 is omitted, then there is no disruptive outer ring. Nevertheless, this known solution could not prevail in practice.

The present invention is based on the object of further developing a flexible press jacket of the type mentioned at the outset in such a way that as many of the following requirements as possible are met:

a) the production of recesses and tongues in the press jacket end area should be superfluous; b) the assembly of the press jacket end area on the respective jacket support disk should be able to be carried out with as little work as possible; if this assembly process takes place inside the paper machine, it must be taken into account that in many cases the available assembly space at the two roller ends is very cramped;

c) it should be possible to achieve the most precise concentricity of the assembled press jacket;

d) the outer surface of the press casing should be free of fastening elements, e.g. Outer rings.

In principle, this object is achieved according to the invention in that the flexible press jacket has an additional reinforcement in at least one of its two end regions. As a result, the tensile strength and the tensile rigidity in the circumferential direction are increased in the end region in such a way that it is no longer necessary to clamp the press-jacket end region between two components. Rather, the press jacket according to the invention is suitable, without the aid of an outer ring, a tensioning band, tension thread or the like, to be attached to the outer surface of a rotatable support element belonging to the jacket support disk (claim 1). In the best case, the arrangement for fastening the press jacket on said support element is completely free of any fastening elements that would be assigned to the outer surface of the jacket (claim 2).

Thanks to the invention, several advantages can be achieved: the shape of the press jacket end region remains completely or at least approximately cylindrical. In other words, deformation of the end of the press jacket is not necessary when assembling the press jacket; this also eliminates the need to produce recesses and tongues. The joining of the press jacket end area to a radially outer part or area of the jacket support disk can be carried out in the same way or at least in a very similar way as the joining of two metallic components. Thus, the assembly of the press jacket on the jacket support disks can be carried out in a simpler way than before, namely with less work than before, so that, if necessary, even an inexperienced person can be entrusted with the assembly work. Another important advantage is that no outer ring (rotating with the press jacket) is required. Likewise, the clamping elements required according to D1 are no longer required; this makes it easier to work in confined spaces within the paper machine.

The press jacket end region preferably has a constant thickness, measured along axially parallel jacket lines. As a rule, not only the outer jacket surface but also the inner jacket surface of the press jacket end region (which has additional reinforcement) is cylindrical on a fully assembled press jacket (claim 3). However, this can be deviated from if necessary. It can namely be advantageous to make the inner lateral surface of the press jacket end region weakly conical, with an inner diameter increasing in the direction outwards or inwards (claim 4). Fastening the press jacket end region to any ring-shaped support element belonging to the jacket support disk (or directly to the support disk) can thereby be facilitated. In both cases, it can be advantageous to provide a support element that can be enlarged in diameter, that is to say expandable (claim 5). However, the use of a non-expandable ring is also possible, e.g. a mounting ring, which is inserted outside the shoe press roll in a new press jacket to be retrofitted (see DE 101 38 527.7).

According to claims 6 to 32, the invention is applicable to flexible press sleeves with different conventional reinforcements, in particular with fabric or scrim reinforcement. In claims 6 to 32 different embodiments of the additional reinforcement are also specified; this can be designed as an additional or reinforced reinforcement. Alternatively or in addition, materials with a modulus of elasticity higher in the circumferential direction can be used. Another possibility is that a reinforcing ring is integrated in at least one of the press jacket end regions. The aim of all these measures is to improve the extensibility in the circumferential direction of the press jacket. To reduce the end area compared to previously.

According to claims 33 to 41, protection is also claimed for a complete shoe press roll with a flexible press jacket designed according to the invention. At least one of the two jacket support disks can be adapted in one way or the other to the press jacket end region designed according to the invention. Details are explained below in the context of the figure description.

Embodiments of the invention are described below with reference to the drawing.

Figure 1 is a partial longitudinal section through a shoe press roll with a flexible press jacket according to the invention.

Figure 2 is a partial view of one belonging to the shoe press roll

Expanding ring.

FIGS. 3 to 6 show variants of FIG. 1.

Figures 7 to 13 show different modifications of the press jacket end area in longitudinal section.

FIG. 14 shows the method for producing a press jacket on the outer jacket surface of a casting cylinder. FIG. 15 shows the press jacket produced according to FIG. 14 in the fully assembled state.

FIG. 16 shows a further variant of a shoe press roll with a flexible press jacket according to the invention.

FIG. 1 shows only one of the two end regions of the flexible press cover 10 and its attachment to a rotatable cover support disk 20 of a shoe press roll. This is known in a known manner by means of a roller bearing 21 stored in an invisible supporting body. Also not shown is a press shoe, by means of which the press jacket 10 can be pressed against a counter roll. These and other known details of a shoe press device can be seen, for example, from DE 19522761 (PH 10178).

The press jacket 10 consists essentially of a plastic layer 30, e.g. made of polyurethane with a conventional reinforcement embedded therein; the latter in a known manner comprises axially parallel longitudinal threads 31 and circumferential threads 32 wound thereon. The thickness d of the press jacket 10 is selected such that P grooves or blind bores 33 can be provided within the press zone. In the end region E, the press jacket 10 has essentially the same thickness d as in the press zone P. In the end region E, additional circumferential threads 34 of the highest possible tensile strength and tensile stiffness (high modulus of elasticity) are provided as additional reinforcement (ie in addition to the conventional reinforcement 31, 32) ) embedded in the plastic layer 30.

According to the invention, these circumferential threads 34 form an additional reinforcement, made from high-strength plastic or metal threads or wires. Compared to the circumferential threads 32 of the conventional reinforcement, the additional circumferential threads or wires 34 can have a larger thread diameter and / or can be made of a material that has a higher tensile strength and in particular a higher modulus of elasticity (e.g. Kevlar). However, it is also possible to choose the same diameter and / or the same material for the threads 32 and 34, preferably a material with a relatively high modulus of elasticity. The plastic layer can also be formed from a material with an increased modulus of elasticity. Between the end region E and the press zone P, the press jacket 10 can have a zone of reduced thickness in order to increase its flexibility precisely where an increased deformation takes place during operation.

The jacket support disk 20 comprises an integrally formed collar 22 and an extension ring 23 screwed onto it. The collar 22 and ring 23 encompass the rolling bearing 21 and carry an axially displaceable clamping ring on the outside, which is designed as an annular piston 24. The three components 22, 23 and 24 mentioned are shaped so that an annular space 25 is formed between them, which can be acted upon by a pressure medium. As a result, the annular piston 24 can be hydraulically or pneumatically displaced outward parallel to the roller axis. Sealing rings 26 serve to seal the annular space 25.

An expansion ring 27 is provided for connecting the press jacket 10 to the jacket support disk 20. This has a cylindrical outer surface, if necessary provided with recesses, which engages in the cylindrical inner surface of the press jacket end region E. The expansion ring 27 has a conical inner circumferential surface which interacts with a conical outer circumferential surface of the annular piston 24. When the annular piston 24 is axially displaced (to the left in FIG. 1), the expansion ring 27 (which axially abuts the jacket support disk 20) is widened and thus a secure, liquid-tight connection of the press jacket 10 to the jacket support disk 20. Thanks to the additional reinforcement 34 no outer clamping ring is required at the end of the press jacket.

The axial displacement of the annular piston 24 can also take place with the aid of screws (indicated at 28). Such screws 28 can also be used for axially fixing the annular piston 24 after the annular piston has been moved hydraulically or pneumatically. FIG. 2 shows the expansion ring 27 from the outside. This ring gets its expandability through alternately incorporated slots 29, in which a highly elastic filler is provided so that the necessary hermetic seal of the interior of the roller is ensured.

FIG. 3 differs from FIG. 1 in that in the end region E, a radially inwardly projecting bead 30A is provided on the press jacket 10 ', which fits into an insertion of the expansion ring 27'. As a result, the accuracy of axially fixing the press casing 10 ′ to the support disk 20 is increased.

The press jacket 10A of the embodiment shown in Figure 4 is almost identical to that of Figure 1; only the length E 'of the press jacket end area was increased somewhat, corresponding to the greater axial length of the expansion ring 27A. The jacket support disk 20A in turn has a collar 22A The roller bearing 21 is received. A simple clamping ring 24A is located between the collar 22A and the expansion ring 27A. This is moved axially outwards solely with the aid of screws 28, whereby with its conical outer surface, which cooperates with a conical inner surface of the expansion ring 27A, it increases the outer diameter of the expansion ring in order to establish a secure connection with the press cover 10A. A collar 27B is formed on the expansion ring 27A, which in turn facilitates the exact axial fixing of the press jacket to the support disk 20A.

In a shoe press roll according to the invention, both roll ends can be formed according to FIG. 1. Another possibility is to design one roller end of a shoe press roller according to FIG. 1 or 3, the other roller end, however, according to FIG. 4 or according to FIGS. 5 or 6 described below.

The pressing jacket 10B of the exemplary embodiment shown in FIG. 5 differs from the pressing jacket 10A of FIG. 4 only in that the inner jacket surface in the end region is not continuously cylindrical, but is somewhat conical from the outside, with the inside diameter decreasing from the outside to the inside.

This facilitates the insertion of a mounting ring 40 which has a corresponding conical outer surface. The insertion of this ring 40 (and the fastening of the same in the press casing 10B, for example by means of adhesive) is preferably carried out outside the shoe press roll, that is to say before a worn press casing to be replaced and to be replaced is removed. The following is provided for attaching the mounting ring 40 carrying the press jacket 10B to the jacket support disk 20B: The outer jacket surface of the jacket support disk 20B is offset at 41. The inner circumferential surface of the reinforcement ring 40 has a corresponding shoulder, with (in the example shown) an axially outwardly following a relatively small inner diameter D followed by a larger inner diameter. This allows the press jacket 10B together with the pre-assembled mounting ring 40 in the direction of arrow P over the entire Slide the stationary support body (not shown) onto the cladding support disk 20B. This is possible thanks to the fact that the relatively small inner diameter D of the ring 40 is somewhat larger than the outer dimensions of the stationary support body including the press shoe and other accessories. The following is provided for screwing the ring 40 to the jacket support disk 20B: A bushing 42 is rotatably mounted in a bore in the jacket support disk 20B. A nose flange 43 is formed on the inner end of the bush 42; a radial pin 44 is inserted into the outer end. In the illustrated position of the bushing 42, the nose of the nose flange 43 engages the inner end of the ring 40. By rotating the bush 42, however, the nose allows the reinforcement ring to pass in the direction of the arrow P when it is inserted. A screw 28 is provided to fix the mounting ring 40 (together with the press jacket 10B) to the jacket support disk 20B with the aid of the aforementioned nose flange 43. It is understood that several such arrangements are distributed over the circumference of the cladding support disk 20B.

FIG. 6 shows a simplified alternative to FIG. 5. The mounting ring 40 'here has a smooth inner lateral surface (without the heel 41 shown in FIG. 5); in addition, the socket 42 is omitted. The mounting ring 40 'is screwed to the casing support disk 20' by means of simple studs 45. However, with this construction, a smaller inner diameter D 'of the mounting ring 40' is generally required than in FIG. 4. Thus, when the press casing is pulled in, the mounting ring 40 'is nevertheless can pass the stationary support body with its accessories, it may be necessary to arrange some of these accessories to be movable on the support body; see the parallel patent application DE 101 38 527.7.

The following is provided for attaching the press casing 10C to the mounting ring 40 ': The mounting ring has a conical outer surface that tapers outwards. In addition, the peripheral threads 32A and / or 34A are wrapped with increased pretension in the press jacket end region E ", so that the end region E" also tapers conically in the outward direction. The fastening of the press jacket 10C on the mounting ring 40 'is similar to that Attach a vehicle tire to its wheel rim.

The press jacket version with circumferential threads wrapped under increased pretension can also be combined with a mounting ring, the outer jacket surface of which is cylindrical.

FIG. 7 shows a press jacket 11 modified from FIG. 1, the conventional reinforcement (different from FIG. 1) of which has axially parallel longitudinal threads 35 arranged outside the circumferential threads 32 (corresponding to WO '293). As additional reinforcement, circumferential threads 36 are provided, which are preferably wound onto the conventional reinforcement 32, 35 from the inside. As an alternative to this or in addition, circumferential threads 36 ′ can be provided for further reinforcement of the pressing material end region, which threads are wound onto the conventional reinforcement 32, 35 from the outside. The press jacket 12 shown in FIG. 8 has a fabric 37 as a conventional reinforcement. As additional reinforcement of the press jacket end area, circumferential threads 38 are provided, which are wound onto the fabric 37 from the outside. Alternatively or additionally, circumferential threads 38 'arranged radially on the inside can be provided.

In the exemplary embodiments according to FIGS. 7 and 8, the two press jacket end regions can be of identical design. In contrast, the variant shown in FIG. 9 can only be provided on one of the two press jacket ends. This results from the manufacturing process according to EP 0330680 (manufacture of the press jacket on the outside of a casting cylinder). 9 shows a press jacket 13, the conventional reinforcement 31, 32 of which corresponds to that of the press jacket 10 shown in FIG. The end region of the press casing 13 shown (similar to FIG. 3) has a radially inwardly projecting thickening 30A. This contains an additional reinforcement, which can be designed as a fabric or (as shown) as a scrim, comprising longitudinal threads 39 parallel to the axis and circumferential threads 39 'wound thereon. In addition, a thickening (not shown) projecting radially outward can be provided, similar to that of FIG. 1 or 3. FIG. 10 shows a press jacket 50 according to the invention, the end region of which has no thickening. The additional reinforcement is formed here in that the peripheral threads 32 'are wound more densely in the end region than the peripheral threads 32 located outside the end region. The peripheral threads 32 and 32' can consist of the same material. As an alternative to this, the peripheral threads 32 'can be formed from a material with an increased modulus of elasticity. In addition, the plastic layer 30 can be produced in the end region from a material with an increased modulus of elasticity.

FIGS. 11 to 15 show embodiments of the press jacket according to the invention, in which a reinforcement ring (made of plastic or metal) is integrated as additional reinforcement in the end region of the press jacket. 11, the thickness d of the axially outer region 52 of the reinforcing ring 51 is substantially the same as or greater than the thickness of the end region E of the press jacket 10 of FIG. 1. The axially inner region 53 is substantially thinner and overlaps the end of the Press sleeve 54 initially produced in a conventional manner (EP '680) with its conventional reinforcement 31, 32. The ring 51 is fixed by pouring on an additional plastic layer 55 and simultaneous wrapping of additional peripheral threads 56. The pressing sleeve 54 can be attached to the jacket support disk as 1 or 4 or by means of screws which engage directly in the reinforcing ring 51 in the axial direction (see threaded bore 59).

FIG. 12 differs from FIG. 11 in that the reinforcing ring 51A is thinner in its axially outer area than the thickness d of the finished press jacket end area, and in that it is covered over its entire length by the additional plastic layer 55A with additional circumferential threads 56.

FIG. 13 shows the end region of a press jacket 60 produced according to WO '293 with a reinforcement ring 61. A casting cylinder 62 with its inner jacket surface 63 is shown schematically 64. The plastic layer 65 is then poured, with the Circumferential threads 66 are wound from the inside onto the longitudinal threads 64 and onto the reinforcing ring 61. The reinforcing ring 61 has a radially inwardly projecting flange 67 for fastening the press casing 60 to a casing support disk (not shown). Alternatively, an outwardly projecting flange 68 could be provided.

FIG. 14 shows the manufacturing process of a press jacket 70 with reinforcing rings 71 and 72. The manufacturing process corresponds to that of EP '680, with a casting cylinder 73, on the outer jacket surface of which the manufacturing takes place. Deviating from EP '680, instead of tension rings, the reinforcement rings 71 and 72 are provided, which initially serve to stretch the longitudinal threads 74, but which remain part of the press jacket 70 after the plastic layer 75 is poured on and the circumferential threads 76 are simultaneously wound up. The reinforcement rings 71 and 72 are securely fixed in the press jacket 70 in that the longitudinal threads 74 (as known from EP '680) are pulled in a meandering shape through the reinforcement rings 71, 72 and then tensioned, and also in that the circumferential threads 76 with a certain pretension be wound onto the reinforcement rings. FIG. 14 also shows how the casting nozzle 77 moves from one end to the other end of the casting cylinder 73 during the casting process, while the latter rotates at the same time.

The one reinforcement ring 71 has a radially inwardly projecting flange 71 a, which bears against an end face of the casting cylinder 73. The other reinforcing ring 72 has a radially outwardly projecting flange 72a, in which clamping screws 78 engage for tensioning the longitudinal threads 74.

FIG. 15 shows the press jacket 70 produced according to FIG. 14 in the state in which it is assembled on jacket support disks 79 and 80. The flanges 71a and 72a serve to fasten the press jacket to the support disks, in each case with the aid of screws 81, 82. Each of the two reinforcement rings 71, 72 is centered on an outer jacket surface of its jacket support disk. In order to facilitate the pulling in of the press jacket 70 in the axial direction (arrow P), the diameter of the outer jacket surface of the left-hand support disk 79 (in FIG. 15) is smaller than that of the right support disk 80. Accordingly, the casting cylinder 73 is somewhat offset at 83 in FIG. 14.

In the press jacket 14 shown in FIG. 16 (the conventional reinforcement of which is not shown), an additional reinforcement is designed as an inwardly folded (or everted) end section 16 of the press jacket. An additional reinforcement 15 is provided therein. As shown in FIG. 16, the inner circumferential surface of the inwardly folded end section 16 is conical with an inner diameter that increases toward the inside. As a result, the press casing 14 is attached to the jacket support disks 20C and 20D in a manner similar to the attachment of a vehicle tire to a wheel rim. The one press jacket end section preferably rests directly on the jacket support disk 20D, which has a corresponding conical outer peripheral surface. The other end section rests on a clamping ring 17, which likewise has a corresponding conical outer circumferential surface and which can be displaced axially parallel on the jacket support disk 20C. In the radial direction from the outside inwards, a plurality of ring segments 18 can be inserted into the jacket support disk 20C. These extend through screws 19, with the aid of which the press jacket end section can be clamped between the clamping ring 17 and the ring segments 18.

Claims

claims

1. Flexible press jacket (10) which is intended for a shoe press roll which serves for dewatering or smoothing a running fibrous web and which has a plastic layer (30) and, as reinforcement, a “conventional” reinforcement (31, 32) embedded therein, characterized that the press jacket (10) has at least in at least one of its two end regions (E) an additional reinforcement (34) that the

Press sleeve makes it suitable to be attached to a rotatable support element (e.g. expansion ring 27) of the shoe press roller, preferably on the outer surface of the support element.

2. Flexible press jacket according to claim 1, characterized in that the arrangement for fastening the press jacket (10) on said support element (27) is free from the fastening elements assigned to the outer surface of the jacket.

3. Flexible press jacket according to claim 1 or 2, characterized in that the inner jacket surface of the press jacket end region E having the additional reinforcement (34) is cylindrical.

4. Flexible press jacket according to claim 1 or 2, characterized in that _die _. Inner surface of the additional reinforcement (34)

Pressing jacket end area is conical, with an increasing or decreasing inside diameter towards the outside (FIGS. 5 and 6).

5. Flexible press jacket according to claim 3 or 4, characterized in that said support element (27, 27 A), as known per se, expandable, i.e. in the

Diameter can be increased (Fig. 1 - 4).

6. Flexible press jacket according to one of claims 1 to 5, its conventional Reinforcement has a fabric (37) or a "scrim", the scrim comprising axially parallel longitudinal threads (31) and circumferential threads (32), characterized in that the additional reinforcement is designed as an additional reinforcement (34; 36; 38; 39 ') is.

7. Flexible press jacket according to claim 6, characterized in that the additional reinforcement has circumferential threads (34; 38) which are wound onto the conventional reinforcement from the outside.

8. Flexible press jacket according to claim 6 or 7, characterized in that the additional reinforcement has peripheral threads (36) which are wound from the inside to the conventional reinforcement (32, 35) (Fig. 7).

9. Flexible press jacket according to one of claims 1 to 8, characterized in that the additional reinforcement, preferably in only one of the two end regions of the press jacket (13), comprises a thickened bead (30A), the inside diameter of which is smaller than the inside diameter of the rest Press casing (Fig. 3, 9).

10. Flexible press jacket according to claim 9, characterized in that additional reinforcement is provided in the bead (30A), e.g. Axially parallel longitudinal threads (39) and circumferential threads (39 ') - (FIG. 9) wound on them, or a fabric.

11. Flexible press jacket according to one of claims 1 to 8, characterized in that the additional reinforcement is formed from additional peripheral threads (32 ') which form a continuation of the conventional peripheral threads (32), e.g. with increased winding density and / or increased

Thread thickness (Fig. 10).

12. Flexible press jacket according to claim 6, characterized in that the additional reinforcement has at least one band, eg fabric band.

13. Flexible press jacket according to one of claims 1 to 12, characterized in that the end region (E) having the additional reinforcement (34) is larger

Thickness (d, Fig. 1) has as the adjacent press jacket area.

14. Flexible press jacket according to claim 1 or 2, characterized in that the additional reinforcement is designed as an inwardly folded end section (16) of the press jacket (14).

15. Flexible press jacket according to claim 14, characterized in that an additional reinforcement (15) is provided in the end section (16).

16. Flexible press jacket according to claim 14 or 15, characterized in that the inner peripheral surface of the inwardly folded end portion (16) is conical with an increasing inside diameter in the direction.

17. Flexible press jacket according to claim 14 or 15, characterized in that the inwardly folded end portion has a substantially cylindrical inner peripheral surface.

18. -Flexible press jacket according to one of claims 1 to 5, characterized by an additional reinforcement, which is formed in that at least one of the materials used for a press jacket end region (E) has a higher modulus of elasticity in the circumferential direction compared to the Materials of the other press jacket areas.

19. Flexible press jacket according to claim 18, characterized in that the reinforcement of the end region (E), in particular the circumferential threads (32 ') have an increased modulus of elasticity which is at least 15000 MPa, preferably at least 25000 MPa.

20. Flexible press jacket according to claim 18 or 19, characterized in that the plastic layer (30) in the end region (E) has an increased modulus of elasticity which is at least 200 MPa.

21. Flexible press jacket according to one of claims 1 to 5, characterized by an additional reinforcement which is formed in that in the entire press jacket at least one of the materials used has an increased modulus of elasticity in the circumferential direction.

22. Flexible press jacket according to claim 21, characterized in that the peripheral threads (32) have an increased modulus of elasticity which is at least 15000 MPa, preferably at least 25000 MPa.

23. Flexible press jacket according to one of claims 6 to 17, characterized in that in the additional reinforcement, the peripheral threads (34; 36; 38; 39 ') have an increased modulus of elasticity which is at least 15000 MPa, preferably at least 25000 MPa.

24. ^" Flexible press jacket according to one of claims 1 to 5, characterized by an additional reinforcement, which is formed in that - in the manner of

Prestressed concrete - circumferential threads (32A) with increased pretension are wrapped in at least one end region (E ") (FIG. 6).

25. Flexible press jacket according to claim 24, characterized in that the end region (E ") tapers conically in the outward direction.

26. Flexible press jacket according to claim 24 or 25, characterized in that circumferential threads (34A) of additional reinforcement with increased pretension are also wrapped.

27. Flexible press jacket according to one of claims 1 to 6, characterized in that the additional reinforcement has a reinforcement ring (51; 51 A; 61; 71, 72) prefabricated from a plastic or a metal.

28. Flexible press jacket according to claim 27, characterized in that

- Seen in cross section through the reinforcement ring - at least a part of the reinforcement ring is cast into the press jacket.

29. Flexible press jacket according to claim 28, characterized in that the reinforcing ring is anchored in the press jacket with the aid of reinforcing threads (56; 64, 66; 74, 76).

30. Flexible press jacket according to claim 28 or 29, characterized in that the reinforcing ring (51, 51 A) is poured in after the conventional plastic layer has been cast.

31. Flexible press jacket according to claim 28 or 29, characterized in that ^" the casting of the reinforcing ring (61; 71, 72) is carried out simultaneously with the casting of the conventional plastic.

32. Flexible press jacket according to one of claims 27 to 31, characterized in that the reinforcing ring has a flange (67 or 68 or 71a, 72a) for fastening the press jacket to a rotatable support element (eg jacket support disk 79, 80) of the shoe press roll.

33. Shoe press roll, which comprises a flexible press jacket designed according to one of claims 1 to 32 and which has a rotatable jacket support disk (20) at each roll end, which is mounted on a stationary support body, characterized by the following features:

a) at least one of the jacket support disks (20) comprises a clamping ring (24 or 24A) which is axially displaceable on an outer peripheral surface of the jacket support disk;

b) the clamping ring has a conical outer surface which engages in a conical inner surface of an expandable ring (27 or 27A);

c) the expandable ring rests in the inner surface of the press jacket end region (E) having the additional reinforcement (34);

d) the arrangement is free from the fastening elements assigned to the outer surface of the press jacket.

34. Shoe press roller according to claim 33, characterized in that the clamping ring (24A) by means of screws (28) is axially displaceable.

35. Shoe press roll according to claim 33, characterized in that the clamping ring (24), as known per se, is axially displaceable by means of a hydraulic "pressure chamber (25).

36. Shoe press roll according to one of claims 33 to 35, characterized in that the expansion ring (27A) has a collar (27B) for axially fixing the press cover (Fig. 4).

37. shoe press roll according to the preamble of claim 33, characterized in that A mounting ring (40, 40 ') is provided on at least one of the roller ends for connecting the press cover (10B; 10C) to the cover support disk (20B; 20 "), which is outside the press roll and into the press cover end which has additional reinforcement (34, 34A) can be used and then (together with the press jacket) can be attached to the jacket support disk (Fig. 5, 6).

38. Shoe press roll according to claim 37, characterized in that the said mounting ring (40, 40 ') has a conical outer jacket surface, matching a conical inner jacket surface of the press jacket end region having the additional reinforcement (34; 34A).

39. shoe press roll according to claim 37, characterized in that the mounting ring has a substantially cylindrical outer surface.

40. Shoe press roller according to one of claims 37 to 39, characterized in that the mounting ring (40 ') can be inserted into an (according to claim 25 or 26) conically tapered end region of the press jacket (Fig. 6).

41. Shoe press roll according to one of claims 37 to 40, characterized in that the mounting ring (40, 40 ') has a collar for axially fixing the press cover.