EP1505201B1 - Device for treating a web - Google Patents

Description

The invention relates to a device for treating a material web, in particular for influencing the gloss and / or smoothness of a paper or board web or for dewatering a paper or nonwoven web, with at least one nip formed between a Nipeinheit with at least one extended in the running direction broad nip shoe and formed on the wide nip shoe circulating flexible band and a complementary counter unit, wherein the Breitnipeinheit also arranged between the Breitnipschuh and the circulating flexible band, consisting of flexible and / or elastic material plate and several provided between this and the Breitnipschuh, in the web running direction comprises successive actuators and the actuators are separated and / or group-driven.

A device of this kind is in the US Pat. No. 6,334,933 described.

Calender arrangements with a shoe roll having a peripheral, relatively flexible jacket, which is loadable by means of a one-piece pressure shoe towards a counter-roller, are known. These so-called Breitnipkalander serve the finishing of paper or cardboard sheets. The finishing result, i. Gloss and smoothness, is dependent on the nip width measured in the web running direction, which is determined by the width of the shoe. Since the shoe is integral with the usual Breitnipkalandern, the nip width can only be changed by replacing the shoe with a wider or narrower shoe. Apart from the fact that for different nip widths according to different shoes must be kept, which is correspondingly expensive, such a shoe exchange is also extremely expensive.

The from the US Pat. No. 6,334,933 known Breitnippresse comprises a roller and a stationary counterpart as Breitnipschuh over which a press belt is guided, which can be pressed via a flexible plate to the roller, to which the flexible plate is acted upon by two provided on the stationary counterpart hydrostatic pressure pockets by a flexible Pressure hose are sealed against each other. To seal the two hydrostatic pressure pockets also an inlet side and an outlet side pressure hose are provided. In this case, only different pressure longitudinal profiles can be adjusted by an appropriate loading of the flexible plate by the hydrostatic pressure pockets, wherein the outlet side seal can be included for setting these pressure longitudinal profiles. In contrast, the inlet-side pressure hose is only the seal.

At one of the US 4,576,682 Known Breitnippresse the Breitnipeinheit comprises a broad nip shoe which is pivotally mounted at its inlet end to a transverse to the direction of web travel extending axis and at the other end by a Anpresseinheit so acted upon that guided over the wide nip shoe circulating flexible band by a directly acting on this section of the Breitnipschuhs is pressed against a counter-roller. In the web running direction in front of the flexible plate directly acting on section of Breitnipschuhs is provided between the pivotable Breitnipschuh and the rotating flexible band formed by a cylinder / piston unit actuator, which is controlled separately from the Anpresseinheit and the piston member, the circulating flexible band directly again applied. In this embodiment, which comprises a cylinder / piston unit as an actuator, in which no flexible plate is provided between the wide-nip shoe and the circulating flexible band, the actuator can also be depressurized in order to shorten the weaving width.

In another embodiment of this from the US 4,576,682 known Breitnippresse the actuator is formed by one or more mutually parallel, acted upon by the same pressure pressure hoses. In this case, a flexible plate is again provided between the wide-nip shoe and the circulating flexible band. In this case, this flexible plate is supported in the web running direction in front of the actuator in the region of the inlet end of the broad nip and within the same and in the web running direction after the actuator in the region of the outlet end of the broad nip and within the same directly to the broad nip shoe. Apart from the fact that even in the case of several pressure hoses these can always be acted upon only with the same pressure, so both the beginning and the end of the broad nip is always set directly by the broad nip shoe.

The invention has for its object to provide an improved device of the type mentioned, in which the width of the broad nip shoe measured in the web running direction, if necessary, can be changed quickly in the simplest possible way.

This object is achieved in that the broad nip shoe over several successive in the transverse direction, supported on an axis Anpress units can be acted upon and the actuators in the web running direction resulting nip width is variably adjustable by a corresponding application of the flexible or elastic plate, wherein a At least one actuator comprehensive inlet-side actuator assembly and at least one actuator comprehensive outlet-side actuator assembly is provided, which are viewed in the web running direction, each spatially separated from the intermediate central actuators.

Due to this design, the compressive stress in the nip can be changed quickly and almost infinitely or very sensitively, in particular with a constant application of force. The "window" for the Satinagekonditionen is therefore increased accordingly. Regardless of the nip width set in each case, there is always a coherent running surface that is ideal for the hydrodynamic lubricating film. The provided in the inlet and outlet area, spatially separated from the other actuators actuators ensure optimal investment of the flexible band to the complementary counter unit. This complementary counter unit can be a counter-roller or a belt and the like supported in the required manner or the like.

From the DE 43 22 876 A1 is a smoothing device with a sectioned Breitnipschuh known. However, the sectioning of the shoe is used here alone to compensate for production-related stresses to provide over the smoothing zone. A variation of the shoe width is not provided.

At one of the DE 195 44 979 A1 known device for compressing, smoothing and / or dewatering a fibrous web at least one support element is used, which is divided into a plurality, in the direction of passage of the fibrous web one behind the other support element sections. However, the subdivision of the support element only serves to generate a pressure profile in the web running direction with at least two successive pressure maxima.

Expediently, the inlet-side actuator arrangement comprises only one actuator, although in principle it may also have a plurality of such actuators.

Also, the outlet-side actuator assembly preferably again comprises only one actuator. Basically, however, the use of multiple actuators is also conceivable for this outlet area.

In a preferred practical embodiment of the device according to the invention, viewed in the web running direction, the distance between the inlet-side actuator arrangement and the subsequent actuator is greater than the distance between the central actuators.

Accordingly, in the web running direction, the distance between the outlet-side actuator arrangement and the preceding actuator is preferably greater than the distance between the middle actuators.

The distances between the middle actuators can be the same size, wherein preferably the smallest possible distance is selected. In a practical practical embodiment, these middle actuators follow each other directly in the web running direction.

The region between the flexible or elastic plate and the circulating flexible band is in particular hydrodynamically and / or hydrostatically lubricated so that the circulating flexible band can slide optimally over the plate.

In particular, mechanical, hydraulic, pneumatic, electromechanical, electromagnetic and / or thermal actuators may be provided.

In an expedient practical embodiment of the apparatus erfindungemäßen the actuators are at least partially formed by a respective cylinder / piston unit. These actuators may be formed, for example, at least partially by a respective hydraulic cylinder / piston unit.

In an expedient practical embodiment of the device according to the invention, the inlet and outlet side actuators at least partially each comprise at least one extending in the transverse direction support bar, which is inserted into a shoe-side transverse groove and in particular hydraulically acted upon.

The middle actuators may at least partially each comprise at least one transversely extending, in particular hydraulic, pressure bar. Preferably, these pressure strips each comprise two telescopically telescoped profiles. Between the two profiles, a seal may be provided. Instead of hydraulic pressure bars and pressure hoses, especially in shoe-side recesses positioned pressure hoses may be provided which are individually controlled and can take over the function of hydraulic pressure bars by appropriate expansion.

The middle actuators can be arranged at least partially in a shoe-side recess.

Preferably, the actuators are at least partially controllable both towards the complementary counter unit and away from it.

It is particularly advantageous if the actuators are at least partially radially aligned with respect to the complementary complementary unit.

The pressing units acting on the broad nip shoe are preferably separable and / or group-wise controllable. This makes it possible, in particular, to compensate the axis bending occurring under load.

The flexible or elastic plate may in particular be formed by a flexible steel sheet or the like.

The flexible band is preferably made of polyurethane.

The wide nip unit may in particular be formed by a wide nip roll with a flexible roll shell guided over the flexible or elastic plate.

According to a preferred practical embodiment, the device according to the invention comprises at least one wide-nip calender.

Figur 1

eine schematische Darstellung eines zwischen einer Breitnipeinheit und einer Gegenwalze gebildeten Breitnips einer Vorrichtung zur Beeinflussung von Glanz und/oder Glätte einer Materialbahn und

Figur 2

eine schematische vergrößerte Darstellung eines durch eine hydraulische Druckleiste gebildeten Aktuators.

The invention will be explained in more detail below with reference to an embodiment with reference to the drawing; in this show:

FIG. 1

a schematic representation of a formed between a Breitnipeinheit and a backing roll wide nip a device for influencing gloss and / or smoothness of a web and

FIG. 2

a schematic enlarged view of an actuator formed by a hydraulic pressure bar.

FIG. 1 shows a schematic representation of a formed between a Breitnipeinheit 10 and a backing roll 12 12 wide nip a device 16 for influencing gloss and / or smoothness of a web, which may be in particular a paper or board web.

The Breitnipeinheit 10 comprises at least one extended in the web running direction L broad nip shoe 18 and guided over the Breitnipschuh 18 circulating flexible belt 20. This Breitnipeinheit 10 in particular by a Breitnipwalze with a wide nip shoe 18 and a this associated, further below even closer descriptive flexible or elastic plate guided flexible roll shell 20 may be formed.

In the device 16 in question may be in particular a Breitnipkalander.

The flexible band 20 may be made of polyurethane, for example.

As based on the Figures 1 and 2 can be seen, the Breitnipeinheit 10 also includes a arranged between the Breitnipschuh 18 and the rotating flexible band 20 plate 22 made of flexible and / or elastic material and a plurality between this flexible or elastic plate 22 and the Breitnipschuh 18 provided in the web running direction L each other following actuators 24, over which the resulting nip width in the web running direction L by a corresponding application of the flexible or elastic plate 22 is variably adjustable. The flexible or elastic plate 22 may be formed, for example, by a flexible steel sheet or the like.

In this case, an at least one actuator 24 comprehensive inlet-side actuator assembly 24 ₁ and at least one actuator 24 comprehensive outlet-side actuator assembly 24 _{2 is} provided, which are considered in the web running direction L spatially separated from the intermediate central actuators 24. In the present exemplary embodiment, the inlet-side actuator arrangement 24 ₁ and the outlet-side actuator arrangement 24 ₂ each comprise only a single actuator 24.

As based on the FIG. 1 can be seen, is considered in the web running direction L, the distance a between the inlet-side actuator assembly 24 ₁ and the subsequent actuator 24 is greater than the distance between the central actuators 24, which in the present case have a minimum mutual distance and in the web running direction L directly follow one another.

Accordingly, the considered in the web running direction L distance a 'between the outlet side actuator assembly 24 ₂ and the preceding actuator 24 is greater than the distance between the central actuators 24. The two distances a and a' are in the present case, for example, the same size.

The actuators 24 are preferably separately and / or group-controlled. The area between the flexible or elastic plate 22 and the circulating flexible band 20 is in particular hydrodynamically and / or hydrostatically lubricated. In particular, mechanical, hydraulic, pneumatic, electromechanical, electromagnetic and / or thermal actuators 24 may be provided.

As based on the FIG. 1 can be seen, the inlet-outlet-side actuators 24 each comprise at least one extending in the transverse direction support bar, which is inserted into a shoe-side transverse groove 26 and in particular hydraulically acted upon.

As in particular on the basis of FIG. 2 can be seen, the central actuators 24 each include, for example, at least one extending in the transverse direction, in particular hydraulic pressure bar, which are formed by two telescopically telescoped profiles 28, 30. As based on the FIG. 2 can be seen, the pressure bars 28, 30 are thus closed at the front. Between the two profiles of a respective pressure bar, a seal 32 may be provided.

In order to avoid seals between relatively movable parts, may be provided in each case correspondingly controllable pressure hose instead of the mentioned hydraulic pressure bar.

The central actuators 24 are arranged in a shoe-side recess 34.

At least the middle actuators 24 and preferably also the inlet and outlet side actuators may each be controllable both towards the counter roll 12 and away from it.

How in particular on the basis of the FIG. 1 can be seen, the actuators 24 may be radially aligned with respect to the counter-roller 12.

The wide-nip shoe 18 can be acted upon by a plurality of laterally following, on an axis supported Anpresseinheiten. These pressing units are expediently separated and / or controlled in groups, so that a respective occurring under load axle deflection can be compensated.

With the embodiment of the broad nip shoe according to the invention, the compressive stress in the nip can be changed quickly and very sensitively in a simple manner. With the inlet and outlet side actuator assemblies 24 ₁ , 24 ₂ , which are spatially separated from the central actuators 24, an optimal contact of the flexible band 20 with the counter-roller 12 can be ensured in the inlet and outlet regions, respectively.

Although the invention has been described by way of example specifically in the context of a device intended to affect the gloss and / or smoothness of a paper or board web the invention can be used in a corresponding manner in press sections, which can be dewatered or dehumidified by the device according to the invention webs.

LIST OF REFERENCE NUMBERS

10

Breitnipeinheit

12

backing roll

14

nip

16

contraption

18

Breitnipschuh

20

flexible band, flexible roll jacket

22

flexible or elastic plate

24

actuator

24 ₁

inlet side actuator assembly

24 ₂

outlet side actuator assembly

26

Shoe-side transverse groove

28

profile

30

profile

32

poetry

34

shoe-side recess

L

Web direction

a

distance

a '

distance

Claims (23)

1. An apparatus (16) for the treatment of a material web, in particular for the influencing of the gloss and/or smoothness of a paper web or cardboard web or for the dewatering of a paper web or of a fibre mat web, having at least one long nip (14) which is formed between a long nip unit (10) having at least one long nip shoe (18) extended in the web running direction (L), as well as having a circulating flexible belt (20) which is guided over the long nip shoe (18), and a complementary counter-unit (12), wherein the long nip shoe (10) additionally includes a plate (22), which is arranged between the long nip shoe (18) and the circulating flexible belt (20) and comprises bendable and/or resilient material, as well as a plurality of actuators (24) provided between said plate and the long nip shoe (18) and following one another in the web running direction (L), and wherein the actuators (24) can be controlled separately and/or group-wise,
   characterised in that
   the long nip shoe (18) can be loaded via a plurality of pressing units following one another in the transverse direction and supported at an axle; and in that the nip length resulting in the web running direction (L) can be set variably via the actuators (24) by a corresponding loading of the bendable or resilient plate (22), with an actuator arrangement (24₁) at the run-in side including at least one actuator (24) and an actuator arrangement (24₂) at the run-out side including at least one actuator (24) being provided which are each separated from one another spatially, when considered in the web running direction (L), by the middle actuators (24) disposed therebetween.
2. An apparatus in accordance with claim 1, characterised in that the actuator arrangement (24₁) on the run-in side only includes one actuator (24).
3. An apparatus in accordance with claim 1 or 2, characterised in that the actuator arrangement (24₂) on the run-out side only includes one actuator (24).
4. An apparatus in accordance with any one of the preceding claims, characterised in that the spacing (a) between the actuator arrangement (24₁) on the run-in side and the actuator (24) following it is larger, considered in the web running direction (L), than the spacing between the middle actuators (24).
5. An apparatus in accordance with any one of the preceding claims, characterised in that the spacing (a') between the actuator arrangement (24₂) on the run-out side and the preceding actuator (24) is larger, considered in the web running direction (L), than the spacing between the middle actuators (24).
6. An apparatus in accordance with any one of the preceding claims, characterised in that the spacings between the middle actuators (24) are of equal size.
7. An apparatus in accordance with any one of the preceding claims, characterised in that the middle actuators (24) follow one another directly in the web running direction (L).
8. An apparatus in accordance with any one of the preceding claims, characterised in that the region between the bendable or elastic plate (22) and the circulating flexible belt (20) is hydrodynamically and/or hydrostatically lubricated.
9. An apparatus in accordance with any one of the preceding claims, characterised in that mechanical, hydraulic, pneumatic, electromechanical, electromagnetic and/or thermal actuators (24) are provided.
10. An apparatus in accordance with any one of the preceding claims, characterised in that the actuators (24) are formed at least in part by a respective cylinder/piston unit.
11. An apparatus in accordance with any one of the preceding claims, characterised in that the actuators (24) are formed at least in part by expandable pressure hoses guided on a part periphery.
12. An apparatus in accordance with any one of the preceding claims, characterised in that the actuators (24) on the run-in side and on the run-out side at least in part each include a support rail which extends in the transverse direction, which is inserted into a transverse groove (26) at the shoe side and which can in particular be hydraulically loaded.
13. An apparatus in accordance with any one of the preceding claims, characterised in that the middle actuators (24) at least in part each include at least one pressure rail (28, 30), in particular a hydraulic pressure rail, extending in the transverse direction.
14. An apparatus in accordance with claim 13, characterised in that the pressure rails each include two sections (28, 30) telescopically pushed into one another.
15. An apparatus in accordance with claim 14, characterised in that a seal (32) is provided between the two sections (28, 30).
16. An apparatus in accordance with any one of the preceding claims, characterised in that the middle actuators (24) are arranged at least in part in a recess (34) at the shoe side.
17. An apparatus in accordance with any one of the preceding claims, characterised in that the actuators (24) can be controlled at least in part both towards the complementary counter-unit (12) and away therefrom.
18. An apparatus in accordance with any one of the preceding claims, characterised in that t the actuators (24) are aligned at least in part radially with respect to the complementary counter-unit (12).
19. An apparatus in accordance with any one of the preceding claims, characterised in that the pressing units are controllable separately and/or group-wise.
20. An apparatus in accordance with any one of the preceding claims, characterised in that the bendable or resilient plate (22) is formed by a flexible sheet steel.
21. An apparatus in accordance with any one of the preceding claims, characterised in that the flexible belt (20) is made of polyurethane.
22. An apparatus in accordance with any one of the preceding claims, characterised in that the long nip unit (10) is formed by a long nip roll having a flexible roll jacket (20) guided over the bendable or resilient plate (22).
23. An apparatus in accordance with any one of the preceding claims, characterised in that it includes at least one long nip calender.

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