JP4741944B2 - Pressure cylinder with flexible sleeve for shoe press - Google Patents

Description

  The present invention relates to the technical field of shoe presses or nip presses, particularly those used in the field of paper or card making, but should not be considered limited to this application.

  The shoe press includes a pressure cylinder having a flexible sleeve, in which a shoe is placed that places the flexible sleeve against the surface of a rigid counter cylinder, such as a piece of paper or card in the manufacturing process. An extension zone of pressure applied to the adhesive sheet is defined, thereby squeezing moisture from the piece of paper or card. In fact, the concave shape of the shoe and the convex shape of the opposing roller can be combined to increase the time for applying pressure to the sheet being processed, compared to a press system that uses two rigid pressure cylinders.

  The present invention relates to a method of making a pressure cylinder having a flexible sleeve.

  In general, such a pressure cylinder comprises a flexible cylindrical sleeve, a receiving shaft, and two end plates for holding and guiding the flexible sleeve as it rotates about an axis Δ. Including. These end plates are mounted on the receiving shaft, and each end plate includes a mechanism for attaching a corresponding sleeve end.

  More particularly, the present invention relates to a method used to create a mechanism for attaching a flexible sleeve to an end plate.

  In fact, the design of this locking mechanism is relatively important as long as the sleeve is subject to wear and needs to be able to be replaced periodically. Here, this exchange operation must be performed as quickly as possible in order to minimize the installation stop time for incorporating the shoe press.

  Various attachment means have been conceived to hold the flexible sleeve.

  Therefore, European Patent EP 0442257 proposes clamping the extreme edge of the sleeve by a fixed jaw and movable jaw mechanism. The tapered extensions of these movable jaws work with complementary shaped bevels so that the axial movement of the movable jaws clamps the flexible sleeve between the movable jaws and the fixed jaws Is induced.

  In fact, such an anchoring mechanism can be used to hold the end of the flexible sleeve, but the sliding of the sleeve relative to these jaws cannot be completely eliminated, so it can be used for a period of time. Then, there is a drawback that it is necessary to stop the shoe press, replace the sleeve, and retighten. Here, as described above, since the worker's income is reduced when the operation is stopped, it is indispensable to reduce the cause of the stop as much as possible, particularly for maintenance.

  In order to overcome this phenomenon of relative sliding between the jaw and the sleeve under the influence of the load applied to the sleeve, international patent application WO 02/064885 describes a tongue with a small hole attached to a pin. It is proposed to securely fix the sleeve by using Therefore, according to this document, each fixing mechanism first includes a tapered inner fixing jaw associated with the outer jaw. The outer jaw also has a tapered extension that is for clamping the sleeve with a complementary extension of the inner jaw. The outer jaw also has a series of slots with sleeve mounting wedges. Thus, this apparatus proposes a combination of the operation of clamping the sleeve and the reliable clamping of the sleeve by the wedge. In this case, the tension applied to the sleeve during the pressing operation tends to strengthen this clamping operation.

  Such a simple locking mechanism provides a solution to the relative slip phenomenon found in the locking mechanism. However, it can be seen that fitting a sleeve to such a mechanism is very cumbersome when the outer diameter of the inner jaw is approximately equal to the inner diameter of the stationary sleeve.

  Alongside these locking mechanisms that add a clamping action to the sleeve, other locking mechanisms, such as those described in US Pat. No. 4,878,281, have also been proposed in previous designs. In this patent, a series of pins are used at the level of the corresponding outer end plate surface which is somewhat orthogonal to the axis of rotation of the cylinder. These pins are attached to the small holes created in the tongs to secure the corresponding sleeve ends.

  Such a mechanism is very easy to implement compared to the previously described system if the position of the mounting pin on the plane perpendicular to the axis of rotation makes it easier for the operator to engage the tongue. Has the advantage. However, compared to the previously described mechanism, this locking mechanism has the disadvantage that it requires engaging the sleeve with an extension whose diameter is approximately equal to the inner diameter of the sleeve, which makes it extremely difficult to engage. .

  Furthermore, the locking mechanism according to U.S. Pat. No. 4,878,281 has the disadvantage that a series of wrinkles appear near each end plate while tensioning the sleeve. These wrinkles must be some distance away from the end of the sleeve, so it is necessary to increase the length of the sleeve and pressure cylinder compared to the effective length of the press corresponding to the pressure zone.

  Therefore, while still ensuring the reliability of the fixing portion that securely fixes the sleeve, firstly, the sleeve can be mounted more easily, and secondly, there is no possibility of wrinkles appearing at the end of the sleeve. There is a need for a locking mechanism.

To achieve this objective, the present invention is directed to a pressure cylinder having a flexible sleeve for a shoe press. This pressure cylinder
A flexible cylindrical sleeve, having a series of flexible locking tongs at each level of its two ends, each tong having at least one mounting eyelet;
A receiving shaft;
Two end plates for holding and guiding the sleeve as it rotates about the axis Δ, each comprising an end plate mounted on the receiving shaft and including a mechanism for attaching the corresponding sleeve end, The locking mechanism includes a series of mounting pins for tong small holes that are used to fix the corresponding sleeve ends on an outer surface that is somewhat perpendicular to the axis of rotation of the cylinder.

According to the present invention, this pressure cylinder has each sleeve fixing mechanism,
At least two mounting segments connected to corresponding end plates,
-These segments are in the most radially extended position, known as the operating position defining a cylindrical extension that holds the sleeve at the nominal operating diameter;
Said end plate between a segment, each having a part of a mounting pin of the sleeve, in a retracted position and known as a retracted or retracted position defining a cylindrical extension with a diameter less than the nominal operating diameter A mounting segment movable at least in the radial direction with respect to
-Means for moving the fixing segments between their operating and retracted positions;
A cylindrical inner extension removably secured to a corresponding end plate and pressed against the outer surface of the sleeve at the level of the retaining extension defined by the securing segment in the operating position The diameter of the collar receiving extension that is secured to the end plate and the securing segment in the operating position when the sleeve is subjected to the maximum axial tensile stress that the sleeve is liable to receive during use of the cylinder The direction interval is equal to or greater than the thickness of the material constituting the sleeve.

  According to the present invention, the use of at least a radially movable segment reduces the diameter of the cylindrical receiving extension for the sleeve during the mounting of the sleeve, so that the sleeve is more easily mounted, As a result, it is not necessary to apply a large tensile force to the sleeve to pass the sleeve through the level of extension defined by the mounting segment.

  Furthermore, when the diameter is reduced by placing the mounting segment in the retracted position, it is easier to align the small holes in the fixing tongue with the corresponding mounting pins by providing some play in the sleeve. In this case, the matching operation can be performed without any specific tool and without any effort on the part of the operator.

  In addition, wearing a collar to flatten the sleeve eliminates wrinkles while tensioning the sleeve, so it is necessary in the absence of a flattening collar to separate the active portion of the sleeve from the sleeve mounting zone. In addition, it is not necessary to increase the size of the sleeve.

  According to the present invention, it can be said that the flattening collar is not used to fix the sleeve by a clamp, but merely to eliminate wrinkles.

  According to another feature of the invention, in order to minimize the insertion force on the flattening collar, the radial distance between the collar receiving extension fixed to the end plate and the fixing segment in the operating position, The thickness is equal to or greater than the material constituting the stationary sleeve.

  According to another feature of the invention, the flattening is carried out in order to prevent oil from leaking on the outer surface of the sleeve and thus to eliminate the risk of contamination of the sheet being processed by a shoe press using a pressure cylinder according to the invention. The collar has an annular seal ring at its receiving extension for mating with the outer surface of the sleeve.

  According to another feature of the invention, the securing segments are combined in the axial and radial motion with respect to the corresponding end plate so that it is easier to attach the eyelets of the sleeve ends to the corresponding pins. It is possible to move with.

  Therefore, the sleeve is provided with more play to facilitate the mounting process during the transition to the operating position, and this play with respect to the length and diameter of the sleeve as the segment moves axially and radially. used.

According to the invention, the anchoring segment can be manipulated in various ways, i.e. in a preferred but not necessarily strictly realized manner. To this end, we propose the following:
The end plate should contain a tapered annular ramp converging towards the inside of the cylinder with respect to the axis Δ.
• Each mounting segment should include a ramp that is intended to match the annular ramp of this endplate.
・ The means to move the fixing segment is
An annular trolley that is fitted to the end plate so as to be axially movable with respect to the end plate between two positions known as an operating position and a retracted or retracted position; As the trolley moves, each locking segment moves in a combined axial and radial direction, and when the trolley is in the operating position, these segments are in the most radially extended position, i.e. the operating position. With an annular trolley
-Means to drive and move the trolley.

  The axial movement of the annular trolley can be carried out in various ways, for example a set of double effect hydraulic jacks arranged at the periphery of the end plate, each oriented parallel to the axis of rotation of the cylinder. Note that this can be achieved through use.

In a preferred embodiment, the means for driving the movement of the annular trolley to impart irreversibility to the movement of the trolley
At least one helical screw generated on the annular trolley;
A cap mounted on the end plate so as to be movable in the rotational direction with respect to the axis Δ and having a helical screw for matching with the helical screw of the annular trolley, so that when this cap rotates, A cap that moves the trolley linearly,
Means for manipulating the cap in a rotational direction, including a gear engaging a toothed portion coupled to the cap.

  In accordance with the present invention, each securing mechanism includes at least two mounting segments. However, it has been found that better sleeve geometry is obtained when this attachment mechanism includes at least three attachment segments. Note that the number of mounting segments can be selected as a function of sleeve diameter.

  Similarly, it has been found that the force applied to the sleeve is better distributed when the number of locking tongs included at each end of the sleeve is 12 or more and less than 28. Also, the number of locking tongs will be optimized according to the size of the sleeve to give the sleeve the best geometry that can be achieved in the operating state.

  According to another feature of the invention, at least one of the end plates has a corresponding flattened collar at a position where the engagement with the securing segment is released to facilitate the operation of mounting and dismounting the sleeve. Detachable means for supporting Therefore, by using these detachable support means, it is possible to retract the stopper without having to completely remove the corresponding flattening collar.

  The present invention also provides a pressure cylinder having a sleeve as described above, a pressure cylinder having this sleeve, and a zone for treating a wet fibrous sheet or a zone for applying pressure thereto. A shoe press including a counter pressure cylinder positioned on the opposite side of the pressure cylinder having a sleeve.

  The following description, when read in conjunction with the accompanying drawings showing a non-limiting form of forming a pressure cylinder with a flexible sleeve according to the invention and a shoe press using such a pressure cylinder, Various features will become apparent.

  The shoe press as shown in FIG. 1 includes a support structure S drawn with a composite line. Mounted on the support structure S is a pressure cylinder having a flexible sleeve, generally referred to by the reference numeral 1, and a counter pressure cylinder C. The overall design of such a shoe press does not form part of this patent, and is already widely known, particularly by engineers involved in the design of machines that make and process paper or cards. However, the pressure cylinder 1 with a flexible sleeve, in addition to the sleeve 2, has a receiving shaft 3 with two end plates 4 for holding and guiding the sleeve as it rotates about the axis Δ. Recall that it contains. It should be noted that the receiving shaft 3 is fixed and that the end plate 4 is mounted on the shaft 3 by means of bearings 5 and is therefore rotatable around an axis Δ. The shaft 3 also includes a shoe 6 for pressing the sleeve 2 against the opposing cylinder C. Finally, it can be specified that the end plate 4 is mounted on the shaft so that the end plate 4 is axially movable with respect to the shaft 3 in order to apply axial tension to the sleeve 2. The shaft 3 also includes a hydraulic jack 7 that can apply axial tension to the sleeve 2.

  More specifically, the present invention relates to a method used to fix a sleeve to the end plate 4.

  Thus, according to the essential features of the present invention, the flexible cylindrical sleeve 2 has a series of flexible tongues 12. In FIG. 2, a portion of the flexible tongue 12 is visible at each end 10 of the sleeve 2.

  According to the example shown in the figure, each end 10 preferably has at least 20 tongues in order to ensure a good distribution of the tensile force during the axial tensioning of the sleeve 2. However, if the sleeve diameter is small, the number of tongs used can be reduced, but it is preferred that the number of tongs remain greater than twelve. According to the example shown in the figure, the sleeve includes 24 locking tongs 12. FIG. 2 shows only six of these tongs. The number of tongs 12 could be more than 24, but it is preferable to keep it below 28, especially depending on the size of the sleeve and the stress it receives.

  According to the invention, each of these tongs 12 is also provided with at least one, according to the example shown, exactly one mounting hole 13. Hereinafter, the function of the mounting small hole 13 will be described more specifically.

  In accordance with the present invention, each end plate 4 includes a mechanism 15 that secures a corresponding end 10 of the sleeve 2. Therefore, as specifically shown in FIG. 3 and FIG. 4, each sleeve fixing mechanism 2 is connected to the corresponding end plate 4 according to the example shown in the figure. It includes six mounting segments 16 distributed around. According to the example shown in the figure, the segment 16 is movable in the form of a combined axial and radial movement between the retracted position shown in FIG. 3 and the operating position shown in FIG.

  In order to move the mounting segments 16, each fixing mechanism 15 includes, as moving means, an annular trolley 17 mounted on a corresponding end plate 4 so as to be axially movable, on which an annular trolley is mounted. The segment 16 is fixed so as to be movable in the radial direction with respect to 17. Each mounting segment 16 includes an inner bevel 18 in the form of a partial cone. The inner bevel 18 is pressed against an annular outer bevel 19 provided by a corresponding end plate 4. The annular inclined surface 19 of the end plate 4 has a truncated cone shape with respect to the axis Δ. This truncated cone converges toward the inside of the pressure cylinder 1. Of course, the shapes of the annular bevel 19 and the bevel 18 of the mounting segment 16 are complementary.

  Therefore, the axial movement of the annular trolley 17 corresponds to the combined axial and radial movement of the segment 16.

  In order to realize this movement, each fixing mechanism 15 includes, as means for driving the movement of the trolley 17, according to the example shown in the figure, at least one helical screw 20 generated on the outer periphery of the annular trolley. . The means for moving the annular trolley also includes a cap 21 mounted on the corresponding end plate 4 so as to be movable in the rotational direction with respect to the axis Δ. The cap 21 has at least one helical screw 22 that is intended to match the screw 20 of the annular trolley 17 so that when the cap 21 rotates, the trolley 17 moves.

  Each fixing mechanism 15 also includes a pinion 23 that engages with a tooth-like portion 24 coupled to the cap as a rotating means of the cap 21. The pinion 23 is operated by a shaft 25 having a head 26 on the outer surface of the corresponding end plate 4 for receiving a manual crank or an operating device by electric or pneumatic pressure.

  According to the example shown in the figure, each segment 16 includes four pins 27 as shown in FIG. 2 so that the small holes 13 of the tongue 12 can be attached. Of course, the number of pins 27 attached to each segment 16 is first a function of the total number of eyelets 13 and hence the total number of tongs, and secondly a function of the total number of segments 16. Note that the pin 27 is positioned on a plane of each segment 16 perpendicular to the axis Δ and faces the outside of the sleeve 2.

  Each mechanism 15 for fixing the end of the sleeve 2 described above is configured in the following manner.

  To install the sleeve, the segments 16 are placed in the retracted position R as shown in FIG. 3, so that the segments 16 are less than the nominal operating diameter of the sleeve by their outer surface 30 and the sleeve A cylindrical extension having a diameter less than the inner diameter is defined.

  In this configuration, the sleeve 2 is engaged from one end of the pressure cylinder 1, for example, the right end of FIG. 1, and the first end of the sleeve 2 passes through the right end plate and reaches the level of the left end plate. It is particularly easy to go.

  At this stage, each end 10 of the sleeve 2 is positioned at the level of the corresponding end plate 4 and each eyelet 13 can engage a pin 27. This action is particularly facilitated by the play of the sleeve 2 caused by the difference between the inner diameter of the sleeve and the outer diameter of the extension defined by the segment 16 in the retracted or retracted position R.

  After the small hole 13 has been attached to the pin 27, a cotter pin not shown here is attached to the hole 32 made for this purpose at the end of the pin 27, so that the pin 27 and the small hole 13 are not desired. Can be prevented from coming off.

Then, from the head 26, to pivot the cap 21 about an axis Δ pinion 23 driven to rotate in the fixing mechanism 15, whereby the annular trolley 17 is displaced in the direction of the arrow F _1, therefore, the segments 16 Are subjected to a combined axial and radial movement, thereby bringing the segment 16 to the operating position T as shown in FIG. In this position, the outer surface of the segment 16 defines a cylindrical extension that holds the sleeve 2 to a nominal operating diameter that is greater than or equal to the inner diameter of the stationary sleeve.

  It is noted that from the dynamics taken to move the segment 16, this movement is irreversible, so that the axial tension applied to the sleeve is less likely to induce movement of the segment 16. I want. However, as a matter of course, for safety reasons, the rotation of the pinion 23 of each fixing mechanism 15 can be locked.

  When the operating position T is reached, according to another essential feature of the present invention, the collar 35 is placed in place to flatten the sleeve 2. The purpose of this collar 35 is not to press against the segment 16 to clamp the sleeve, but to stretch the wrinkles that are likely to appear while applying axial tension to the sleeve 2. As such, the collar 35 firstly has the surface 30 of the segment 16 in the operating position and second when the sleeve 2 is subjected to the maximum axial tensile stress that the sleeve 2 may experience during use of the cylinder 2. In addition, the radial distance d between the collar 35 and the receiving extension 36 is generated to be equal to or greater than the thickness e of the material constituting the sleeve 2. Preferably, the distance d is selected to be equal to or greater than the thickness e of the material constituting the stationary sleeve, as shown in FIG.

  Each collar 35 also includes a groove 37 to ensure a seal at the end of the sleeve. In it, a gasket 38 is arranged which is applied to the outer surface of the sleeve 2 and forms a static seal there. Note that each collar 35 is secured by an annular wing 39 of the corresponding end plate 4. The outer diameter of the wing 39 is equal to or smaller than the diameter of the extension defined by the outer surface 30 of the segment at the retracted position R. Therefore, the mounting of the sleeve 2 is not hindered.

  Furthermore, according to the example shown in the figure, the annular trolley 17 hits the slope 19 at its operating position T, so that this operating position corresponds to the position where the segment 16 extends to the maximum in the radial direction.

  The reverse procedure is used when it is desired to remove the sleeve 2. In this regard, in order to be able to remove the collar 35 without completely removing the collar 35, specifically, at the end of the pressure cylinder opposite the end where the sleeve is introduced and removed, FIG. As shown, as a removable means for supporting the collar, a rod that supports the collar 35 at a position where the engagement with the fixing segment is released can be used.

  According to the example shown and described above, not only can the diameter of the end plate 4 be reduced to facilitate passage of the flexible sleeve 2 by the combined axial and radial movement of the segments 16, The spacing between the mounting segments of the two fixing mechanisms 15 of the two end plates 4 in the retracted position compared to the operating position can be reduced, so that some additional play is provided for mounting the sleeve This makes it easier to mount the sleeve. This play is automatically used during the transition to the operating position.

  However, according to the present invention, such a composite motion is not absolutely necessary, and most importantly, the outer diameter of the end plate is temporarily reduced at the level of the mounting segment, thereby providing a sleeve. Note that this facilitates the passage of two. In this case, this temporary decrease in outer diameter corresponds to the radial movement of the segment. It could therefore be recalled that this radial movement is realized by using a hydraulic jack on the radial axis and each mounting segment 16 is actuated.

  Naturally, various other modifications can be made to the present invention without departing from the framework of the present invention.

1 is a schematic cross-sectional view of a shoe press using a cylinder having a flexible sleeve according to the present invention. FIG. 2 is a partial cross-sectional view taken along line II-II in FIG. 1. FIG. 2 is a detailed cross-sectional view orthogonal to the axial direction of zone A in FIG. 1 and shows a part of a sleeve fixing mechanism in a retracted position. FIG. 2 is a detailed cross-sectional view perpendicular to the axial direction of zone A in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure cylinder 2 Sleeve 3 Receiving shaft 4 End plate 5 Bearing 6 Shoe 7 Hydraulic jack 10 End part 12 Tongue 13 Mounting small hole 15 Fixing mechanism 16 Mounting segment 17 Annular trolley 18 Annular slope 19 Annular outer slope 20 Spiral screw 21 Cap 22 helical screw 23 pinion 24 toothed portion 25 shaft 26 head 27 pin 30 segment outer surface 32 hole 35 collar 36 receiving extension 37 groove 38 gasket 39 annular wing 40 removable means C counter pressure cylinder d segment surface 30 and Interval in radial direction of collar receiving extension e Thickness of material constituting sleeve 2 F ₁ Displacement direction of annular trolley R Retraction position S Support structure T Operation position

Claims (11)

A pressure cylinder having a flexible sleeve for a shoe press,
A flexible cylindrical sleeve (2) having a series of flexible locking tongs (12) at each of the two ends, each tong (12) including at least one mounting eyelet (13); A receiving shaft (3);
Two end plates (4) holding and guiding the sleeve (2) as it rotates about the axis Δ, mounted on the receiving shaft (3) and each corresponding end of the sleeve (2) A mechanism (15) for fixing the portion (10), and each fixing mechanism (15) fixes the corresponding end of the sleeve on a surface that is somewhat perpendicular to the rotation axis of the cylinder. In a pressure cylinder comprising two end plates (4) including a series of pins (27) for mounting small holes (13) in tongs (12) used for
Each sleeve fixing mechanism
Including at least two mounting segments (16) connected to corresponding end plates (4), the mounting segments (16) comprising:
A position (T), known as the operating position, in which the segment (16) is in the most radially extended position and defines a cylindrical extension that holds the sleeve (2) at the nominal operating diameter;
A segment (16), each having a portion of the mounting pin (27) of the sleeve (2), is in a retracted position and is known as a retracted position (R) defining a cylindrical extension with a diameter less than the nominal operating diameter. ) At least in the radial direction with respect to the end plate (4), each sleeve fixing mechanism further comprising:
Means for moving the fixing segments (16) between their operating position (T) and a retracted or retracted position (R);
A collar (35) for removably securing a sleeve (2) to a corresponding end plate (4);
The collar (35) has a cylindrical inner extension (36) that is pressed against the outer surface of the sleeve at the level of the retaining extension defined by the securing segment (16) in the operating position (T), the cylinder A receiving extension (36) of a collar (35) fixed to the end plate (4) and an operating position when the sleeve (2) receives the maximum axial tensile force that the sleeve (2) is liable to receive during use The pressure cylinder, wherein a radial distance from the fixing segment (16) in (T) is equal to or greater than a thickness (e) of a material constituting the sleeve (2).   The radial distance (d) between the receiving extension (36) of the collar (35) fixed to the end plate (4) and the fixing segment (16) at the operating position (T) is determined by the sleeve (2 The pressure cylinder according to claim 1, wherein the pressure cylinder is equal to or greater than a thickness (e) of a material constituting the material.   3. The flattening collar (35) has an annular sealing gasket O-ring (38) that is adapted to fit the outer surface of the sleeve (2) at the level of its receiving extension. The pressure cylinder described in.   4. Pressure cylinder according to claim 3, characterized in that the flattening collar has a groove (37) for receiving a sealing gasket (38) at the level of its receiving extension.   The pressure cylinder according to any one of claims 1 to 4, characterized in that the fixing segment (16) is movable with respect to the end plate (4) by a combined axial and radial movement. The end plate (4) comprises a tapered annular bevel (19) that converges with respect to the axis Δ towards the inside of the cylinder,
Each mounting segment (16) includes a bevel (18) that is adapted to match the annular bevel (19) of the end plate (4);
The means for moving the fixing segment (16) is:
An annular trolley (17) mounted on the end plate (4) movably in the axial direction relative to the end plate (4) between the operating position and two positions known as retracted or retracted positions, A trolley (17) is coupled to each anchoring segment (16) for axial movement so that when the trolley (17) moves, each anchoring segment (16) moves in an axial and radial direction, When the trolley (17) is in the operating position, the segment is in the most radially extended position, i.e. the operating position (T), and the means for moving is further
6. Pressure cylinder according to claim 5, characterized in that it comprises means for moving the trolley (17). The means for moving the trolley is:
At least one helical screw (20) generated on the annular trolley (17);
A cap (21) mounted on the end plate (4) so as to be movable in the rotational direction with respect to the axis Δ, for matching with the helical screw of the annular trolley (17). So that when the cap (21) rotates, the cap (21) moves the trolley (17);
7. Pressure cylinder according to claim 6, characterized in that it comprises means for operating said cap in a rotational direction, comprising a pinion (23) engaged with a toothed part (24) coupled to the cap (21). .   8. Pressure cylinder according to any one of the preceding claims, characterized in that it comprises at least three mounting segments (16).   9. Pressure cylinder according to claim 8, characterized in that the number of fastening tongues (12) contained at each end of the flexible sleeve (2) is not less than 12 and less than 28.   At least one of the end plates (4) includes detachable means (40) for supporting the corresponding flattening collar (35) in a position where the engagement with the securing segment (16) is released. The pressure cylinder according to any one of claims 1 to 9.   A pressure cylinder having a flexible sleeve according to any one of claims 1 to 9, and a zone for processing a wet fibrous sheet to match the pressure cylinder (1) having a sleeve. For this purpose, a shoe press comprising a counter cylinder (C) positioned on the opposite side of the pressure cylinder (1) with a sleeve.

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