EP0997577B1 - Headbox - Google Patents

Abstract

Headbox for a paper machine having a feed part, a central part extending across the machine width, and a nozzle. The nozzle extends across the machine width and has at least one continuous wall that runs across the machine width transverse to the lengthwise flow. For absorbing and discharging nozzle expansion forces in a sectional manner, several separate individual support devices distributed across the machine width for influencing the nozzle aperture are attached to the at least one, preferably continuous wall. The resulting lines of force of each support device remain at least substantially in a plane lying perpendicular to the direction of the machine width and in the flow direction, and the corresponding supporting forces individually, at least substantially, are directed to and absorbed in the central part in the plane of the flow direction.

Description

The invention relates to a headbox for a paper machine with a Inlet part, a central part that extends across the machine width and a nozzle extending across the machine width, the at least one is transverse to the longitudinal flow direction across the machine width extending continuous wall.

The central part can in particular by essentially vertical Components are formed that penetrate the entire material flow and thereby on compressive and / or tensile forces in the vertical direction over its the entire width are resilient and extend across the machine width.

Headboxes of this type are known for example from EP 0 323 468 B1 or known from EP 0 631 011 A1. These known headboxes are each overall in the transverse direction, d. H. transverse to the longitudinal flow direction in Sections divided. The advantage of such a structure is that it is independent of width of the construction and in the by the handy reproducible parts resulting in cost reduction. The practical one Realizing such designs is difficult. So in the areas affected by the flow a relatively large effort operated in order to accumulate deposits at the section boundaries To prevent fibers and the like. The cost advantage previously achieved is canceled again.

Furthermore, US-A-3,738,910 discloses a headbox with a central part extending across the machine width, one front assembly and one extending across the machine width Nozzle that crosses at least two across the direction of flow Continuous walls extending across the machine width (lower nozzle wall, upper nozzle wall). The lower nozzle wall is rigid on the central part attached, whereas the upper nozzle wall articulated upstream and downstream by means of a support device in the form of several distributed over the machine width in different, parallel planes individual and jointly adjustable to influence the nozzle opening Support spindles can be rotated several times on one on the front assembly mounted tubular body is articulated. The tubular body is also over a linkage with a central one acting in the middle of the machine on one level Actuator connected, this actuator on the one hand, any prevailing nozzle expansion forces in sections, that is in different, parallel planes above the support spindles and centrally, that means in one plane above the tubular body and on the other hand actuation via the linkage, the tubular body and the support spindles the adjustment of the nozzle opening causes.

The invention has for its object an improved cost-effective To create headbox of the type mentioned, in which the previously mentioned problems are eliminated.

This object is achieved according to the invention by the characterizing part of the claim 1 specified features solved.

According to the invention, at least essentially only such can elements of the headbox that come into contact with the material flow be carried out in a modular design that cannot be adjusted against each other are. Through an appropriate combination of modular Components and at least essentially over the entire On the one hand, width-extending components are the aforementioned ones Taking advantage of a modular structure while on the other deposits of fibers and the like practically without additional effort at the adjustment joints are excluded. So are in particular on that Central part of the following flow-guiding parts are not modular, while the support of at least one nozzle wall over several over the machine width is distributed separately. In order to the expansion forces that occur as a result of the internal pressure of the nozzle recorded relatively evenly across the width. Temperature differences in the support devices, as are known from practice due to the division into individual modules, there is no longer any effect on the accuracy of the nozzle gap.

In particular, it could be on two opposite walls Support devices are attached.

In an expedient embodiment, the central part is across the machine width divided into sections. Alternatively or additionally also the inlet part can be divided into sections across the machine width.

The central part can be designed as a turbulence generator, for example and preferably comprise a plurality of step diffusers.

It is expedient for at least one nozzle wall to be transverse to one Axis extending flow direction pivotable and / or in the flow direction slidably mounted.

Advantageously, at least one continuous nozzle wall supported by a plurality of separate support devices is provided, the bending stiffness of which in the transverse direction, ie in the direction of the machine width, varies in a range from approximately 5 × 10 ⁹ Nmm ² to approximately 7.5 × 10 ¹⁰ Nmm ² per 100 mm in the direction of flow extending wall length. This ensures that the sections are "decoupled" with regard to the deformation.

At least one is preferably provided via a plurality of separate support devices supported continuous nozzle wall over the individual support devices can be positioned in sections.

In a preferred practical embodiment of the invention The different support devices are individually with the headbox connected to the central part and the relevant nozzle wall.

It is particularly advantageous if at least one is pivotable Support device assigned to the nozzle wall using a static model corresponds to at least three bars spaced from the central part and the pivotable nozzle wall at least substantially in one Node are brought together, with at least one rod nearby of the inlet part and at least one further rod near the pivot axis acts on the central part, and at least a third rod on the pivoted nozzle wall acts, and that the at least three rods a respective support device in or symmetrical to a plane are arranged perpendicular to the direction of the machine width and in Longitudinal flow direction.

The length of at least one rod can expediently be changed.

It is also advantageous if the location of at least one point of attack the rods on the central part and / or on the pivotable nozzle wall is changeable.

The support devices acting on the nozzle wall can e.g. be connected to the central part via a base plate.

According to a further advantageous possible embodiment comprises at least one support device is the connection to the central part and / or support part producing the nozzle wall. Such a support part can, for example, from a one-piece cast or welded part consist.

The nozzle walls are expediently without extending in the transverse direction Stiffening ribs and stiffening profiles formed.

On the outside of the nozzle walls facing away from the flow can run in the direction of flow, an equalization of the Tension-serving grooves can be provided.

In a preferred embodiment, the headbox is preferably one imaginary transverse axis provided in the area of the nozzle end pivotable, which acts directly or indirectly on the central part. Thus, with a corresponding swiveling of the headbox the point of impact of the material jet on a downstream drainage unit can be set. Such a design of the headbox is therefore an advantage regardless of the modular design.

The swivel axis of the swivel headbox can be different Be defined way. For example, two can be between each a headbox sidewall and a side support Swivel bearings can be provided. Basically, the preferably in The area of the nozzle end provided by the pivot axis Guides must be defined in which the headbox is stored accordingly is.

In an expedient practical embodiment, the headbox is supported on at least one support device, the least two support units comprises, in particular two in the flow direction Define different points from the end of the nozzle and perform different strokes so that the headbox is approximately pivotable about the nozzle end.

The central part can be stiffened on the inflow side of the central part and / or serving as a fastening element for further functional elements Inlet plate to be assigned, which is transverse to the flow direction extends over at least substantially the entire width of the central part. Such an inlet plate can in particular on the recording be involved in the forces of the hydraulic pressure of the material flow.

In an expedient embodiment of the invention Headbox is at least one nozzle wall on one attached to the central part Support part generally slidably mounted in the flow direction.

Further advantageous embodiments of the specified headbox according to the invention.

Fig. 1

eine schematische, teilweise geschnittene Seitenansicht einer ersten Ausführungsform eines Stoffauflaufs,

Fig. 2

eine schematische Vorderansicht des Stoffauflaufs gemäß Fig. 1 in Richtung des Pfeiles X,

Fig. 3

eine schematische, teilweise geschnittene Seitenansicht einer Ausführungsform eines verschwenkbaren Stoffauflaufs,

Fig. 4

eine schematische, teilweise geschnittene Seitenansicht einer weiteren Ausführungsform eines verschwenkbaren Stoffauflaufs,

Fig. 5

eine schematische, teilweise geschnittene Seitenansicht einer weiteren Ausführungsform eines Stoffauflaufs mit einer verschiebbaren Düsenwand und einer schematisch dargestellten, durch eine Stabwerkskonstruktion gebildeten Abstützeinrichtung, deren mittlerer Stab an dem Zentralteil angreift,

Fig. 6

einen Schnitt durch die der verschiebbaren Düsenwand zugeordnete Verstelleinrichtung, geschnitten entlang der Linie I - I der Figur 5,

Fig. 7

eine schematische, teilweise geschnittene Seitenansicht einer weiteren, mit der der Fig. 5 vergleichbaren Ausführungsform eines Stoffauflaufs mit einer schematisch dargestellten, durch eine Stabwerkskonstruktion gebildeten Abstützeinrichtung, deren mittlerer Stab jedoch an der verschwenkbaren Düsenwand angreift,

Fig. 8

eine schematische, teilweise geschnittene Seitenansicht einer weiteren, mit der der Fig. 5 vergleichbaren Ausführungsform eines Stoffauflaufs mit einer schematisch dargestellten, durch eine Stabwerkskonstruktion gebildeten Abstützeinrichtung, deren mittlerer Stab jedoch an dem Gelenk der verschwenkbaren Düsenwand angreift, und

Fig. 9

eine schematische, teilweise geschnittene Seitenansicht einer weiteren, mit der der Fig. 5 vergleichbaren Ausführungsform eines Stoffauflaufs, wobei zwei der über die Maschenbreite verteilten Abstützeinrichtungen dargestellt sind.

The invention is explained below using exemplary embodiments with reference to the drawing; in this show:

Fig. 1

2 shows a schematic, partially sectioned side view of a first embodiment of a headbox,

Fig. 2

2 shows a schematic front view of the headbox according to FIG. 1 in the direction of the arrow X,

Fig. 3

2 shows a schematic, partially sectioned side view of an embodiment of a pivotable headbox,

Fig. 4

2 shows a schematic, partially sectioned side view of a further embodiment of a pivotable headbox,

Fig. 5

2 shows a schematic, partially sectioned side view of a further embodiment of a headbox with a displaceable nozzle wall and a schematically illustrated support device formed by a framework construction, the central rod of which engages the central part,

Fig. 6

4 shows a section through the adjusting device assigned to the displaceable nozzle wall, cut along the line I - I in FIG.

Fig. 7

5 shows a schematic, partially sectioned side view of a further embodiment of a headbox comparable to FIG. 5 with a schematically illustrated support device formed by a framework construction, the central rod of which, however, engages the pivotable nozzle wall,

Fig. 8

5 shows a schematic, partially sectioned side view of another embodiment of a headbox comparable to that of FIG. 5 with a schematically illustrated support device formed by a framework construction, the central rod of which, however, engages the joint of the pivotable nozzle wall, and

Fig. 9

a schematic, partially sectioned side view of a further embodiment of a headbox comparable to that of FIG. 5, two of the support devices distributed over the mesh width being shown.

The headbox shown purely schematically in Figures 1 and 2 for a paper machine comprises an inlet part 2, a central part 1 and one Nozzle 56.

The nozzle 56 is with two transversely to the longitudinal flow direction on the Machine width extending through walls 4, 5 provided which several to absorb and derive nozzle expansion forces Separate support devices 14 distributed over the machine width or 14 'are assigned.

The inlet part 2 is via individual supply holes 18 with fiber suspension provided. The supply holes 18 are either with longer individual tubes 3 or directly with a common one Distribution pipe 19 connected, which is substantially parallel to the outlet gap is arranged.

The central part is designed as a turbulence generator in the present case and provided with several step diffusers. Over the top nozzle wall 4 and the lower nozzle wall 5, the flow up to one Beam exit 15 out where the material jet finally at an angle α emerges from the horizontal.

The upper continuous nozzle wall 4 is transverse to the longitudinal flow direction extending near the central block or Central part 1 arranged axis 6 pivotally mounted. In the present This is the case with the swivel axis 6 through a transverse to the direction of flow the machine width defines the hinge or joint divided into sections. This is the hinge defining the pivot axis 6 in the Support devices 14 associated supports 7 stored.

The pivotable upper nozzle wall is in the direction of the jet outlet 15 above also associated with the support devices 14 the supports 7 articulated jack 8 supported, each via a Attack bridge element 9 on nozzle wall 4. As a result, the supporting forces resulting from the hydraulic pressure in the nozzle 56 initiated in the central part 1 via the lifting gear 8 and the supports 7. The resulting lines of force K each have a bridge link 9, a lifting gear 8 and a support 7 comprehensive support device 14 each in a direction perpendicular to the direction of the machine width, plane oriented in the direction of flow.

The supports 7 are over a corresponding number of base plates 7a or at least a common base plate with the central part 1 firmly connected and screwed, for example. Other than that, these are Supports 7 not connected to each other transversely to the direction of flow.

Correspondingly, support devices assigned to the lower nozzle wall 5 via one or more base plates 10a with the central part 1 be connected.

Are now the nozzle walls 4 and 5 apart due to the internal pressure of the nozzle pressed, the resulting expansion forces are due of the modular support devices distributed across the machine width 14 or 14 'taken evenly across the width. There is one Structure before that the lines of force K in the side view of the headbox considered C-shaped. As can be seen from FIG. 1 both tensile and compressive forces run through the central part 1.

The machine width emerging from the exit slit or jet exit 15 Material jet arrives in the area of a in the usual way Breast roller 16 on an endless, rotating screen belt 17th

As can be seen from FIG. 2, drive pins 20 are next to one another horizontal lifting gear 8 via a transverse to the direction of flow the machine width divided into sections drive shaft 21 exclusively torsionally rigid connected to each other, so that with an actuation of a assigned drive 22, the nozzle wall 4 (see also FIG. 1) via the entire width is moved in the same way, without other tensioning forces are transmitted from the drive shaft 21.

The lower nozzle wall 5 can basically be the same as that upper nozzle wall 4 are supported, for which purpose again in particular distributed the machine width, each provided with a lifting gear 12 modular support devices 14 'can be provided. A rigid, designed as a support module 10 takes the hydraulic Forces of the nozzle wall 5 and directs them to the one forming a central block Central part 1 further. By lining up several support devices The lower nozzle wall becomes 14 'across the machine width 5 supported evenly across the entire machine width.

Both with regard to the upper modular support devices 14 as well with regard to the lower modular support devices 14 ', the respective Module division can be defined according to the respective circumstances. Here, for example, a division length is in a range of approximately 50 to about 1000 mm and preferably in a range from about 200 to 500 mm conceivable.

The central part 1 gives the entire headbox structure the desired Rigidity. This can be increased by the fact that a in the central part 1 inlet plate 11 on the inflow side is preferred extends beyond the height of the inlet part 2. This is preferred at least essentially over the entire width of the central part 1 extending inlet plate 11 can simultaneously as a structural component serve the inlet part 2.

The entire headbox is around one in the area of the nozzle end or, Beam exit 15 provided axis 24a pivotally mounted so that a corresponding beam angle adjustment is possible. In the present In each case, a journal bearing 24 is assigned to each side wall 23 of the headbox, which is attached to a support 25. The supports 25 are for example on a chair and / or a headbox foundation appropriate. The pivoting movement is from the at least one lifting gear 12 causes this advantageously in the area of the axis of gravity the headbox is positioned.

Fig. 3 shows a schematic, partially sectioned side view of a Embodiment of an overall pivotable headbox. In this The case is the headbox on at least one support device 12 stored, which comprises at least two support units 40, 41, the two in Flow direction a different distance from the nozzle end Define or have beam outlets 15 and different ones Perform strokes so that the headbox approximates the nozzle end 15 is pivotable. In the following case, the two attack Support units 40, 41 on the lower rigid support part 10.

Otherwise, this embodiment can have the same structure as the according to Figures 1 and 2, with corresponding parts same reference numerals are assigned.

Fig. 4 shows a schematic, partially sectioned side view of a another embodiment of a pivotable headbox. In the present The case is that which is preferably provided in the region of the nozzle end 15 Pivot axis of the headbox defined by guides 30 in which the headbox is stored accordingly. With the activation of one assigned adjustment device 31, the headbox is then around defined by the guides 30, located in the area of the nozzle end imaginary axis swiveling.

Otherwise, this embodiment can also have the same structure again have like those according to Figures 1 and 2, with corresponding to each other Parts are assigned the same reference numerals again.

In Figures 5 and 6 is another in a purely schematic representation Embodiment of a headbox shown, in which the lower nozzle wall 5 slidably mounted on the support part 10 and in relation to this in Flow longitudinal direction is displaceable. The nozzle wall is 5 via at least one, for example mechanical, hydraulic and / or pneumatic adjustment device 48 can be moved in the desired direction. This adjusting device 48 engages in the present case Support part 10 and the nozzle wall 5.

As can be seen from FIGS. 5 and 6, the adjustment device comprises 48 two pivot pins 50 mounted in the support part 10, each have an eccentric extension 51 which in one in the nozzle wall 4 provided groove 55 engages. The pivot pins 50 carry levers 52 integrated swivel nuts 53, which have a common adjusting spindle 54 (see FIG. 6) can be actuated with opposing threads. Preferably, the eccentric attachments 51 are each Pivot pin 50 releasable.

Otherwise, this embodiment can have the same structure again like those according to Figures 1 and 2, but corresponding to each other Parts are assigned the same reference numerals again.

In addition, a purely schematic illustration is shown in FIG Embodiment for a respective support device 14 shown as it especially in the other embodiments of the headbox is conceivable.

Such is a respective support device 14 through a framework construction formed, which in the present case three rods 57, 58, and 59 comprises, which is in a spread arrangement on the central part 1 and / or support the upper nozzle wall 4 and at least at a distance from it essentially converge in a node 60.

The support devices assigned to the pivotable nozzle wall 4 14 corresponding to a static model with the present one Case three rods 57, 58, 59, which are at a distance from the central part 1 and the pivotable nozzle wall 4 at least substantially in the Junction 60 are brought together, the rod 57 near the Inlet part 2 acts on the central part 1, the central rod 58 near the Pivot axis 6 and the third rod 59 on the pivotally mounted nozzle wall 4 acts. The rods 57, 58 and 59 are a respective support device 14 arranged in or also symmetrically to a plane, which are perpendicular to the direction of the machine width and in the direction of flow runs. In the present case the rods 57, 58 and 59 are in one perpendicular to the direction of the machine width and in the longitudinal direction of the flow current level, d. H. in the drawing plane of Figure 5, arranged.

In the embodiment shown in FIG. 5, the near reaches Swivel axis 6 provided rod 58 indirectly or directly on Central part 1.

Fig. 7 shows a schematic, partially sectioned side view, a further embodiment of a headbox comparable to that of FIG. 5 with a schematically represented, by a framework construction formed support device 14, the near the pivot axis 6th provided central rod 58, however, directly or indirectly on the around the axis 6 pivotally mounted nozzle wall 4 attacks.

Otherwise, this embodiment has the same structure as that according to Figures 5 and 6, with corresponding parts having the same reference numerals assigned.

Fig. 8 shows a schematic, partially sectioned side view further embodiment of a headbox comparable to that of FIG. 5 with upper ones, each formed by a framework construction Support devices 14. In the present exemplary embodiment, grips this middle rod 58 of a respective support device 14 on which the Swivel axis 6 defining joint of the pivotable upper nozzle wall 4 on. In the left part of Figure 8 is the view x of the anchor of a rod end shown on the nozzle wall.

Otherwise, this embodiment can have the same structure as that 5, with corresponding parts again being the same Reference symbols are assigned.

Fig. 9 shows a schematic, partially sectioned side view further embodiment of a headbox comparable to that of FIG. 5, in the two of the support devices distributed across the machine width 14 are shown. In this Fig. 9 there is also a coordinate system with the axes X, Y and Z indicated. The X direction falls here with the width direction of the paper machine, while the Y direction coincides with the longitudinal flow direction. The Z direction runs perpendicular to the X-Y plane. As a result, the supports are 14 arranged one behind the other in the X direction, while the Bars 57, 58 and 59 of a respective support device 14 each in one y-z plane. The supported on these separate support devices 14 continuous upper nozzle wall 4 is thus over the individual Support devices 14 can be positioned in sections.

In the present case, the middle rods 58 directly or indirectly grip on the central part 1. In principle, however, is also, for example again such a framework construction in which the middle Rod 58 of a respective support device 14 indirectly or directly on the pivotably mounted nozzle wall 4 or on the pivot axis 6 defining joint attacks.

Otherwise, this embodiment can also have the same structure again like the previous embodiments, with each other corresponding Parts are provided with the same reference numerals.

On the outside of the nozzle walls 4, 5 facing away from the flow can run in the direction of flow, an equalization of the Voltage-serving grooves 62 may be provided, such as this can be seen from FIG. 9.

LIST OF REFERENCE NUMBERS

1

Central part

2

feed section

3

supply lines

4

upper nozzle wall

5

lower nozzle wall

6

swivel axis

7

supports

7a

baseplates

8th

screw jack

9

bridge member

10

Support part

10a

baseplate

11

inlet plate

12

screw jack

14

support devices

14 '

support devices

15

Jet exit, nozzle end

16

breast roll

17

screen belt

18

drilling

19

transverse distribution

20

drive journal

21

drive shaft

22

drive

23

Side wall

24

chocks

24a

axis

25

Support

30

guides

31

adjustment

40

support unit

41

support unit

48

adjustment

50

Drehbölzen

51

eccentric intent

52

lever

53

nuts

54

adjusting spindle

55

groove

56

jet

57

Rod

58

Rod

59

Rod

60

node point

62

groove

K

power lines

α

angle

Claims (43)

1. Headbox for a paper machine, comprising a feed part (2), a central part (1) extending over the machine width and a slice (56) which extends over the machine width and which has at least one continuous wall (4, 5) which extends over the machine width transversely with respect to the flow longitudinal direction,
   characterized in that
   in order to absorb and dissipate slice widening forces section by section, a plurality of individual supporting devices (14) distributed over the machine width and separated in order to influence the slice opening (15) are fixed to at least one preferably continuous wall (4), the resultant force line (K) of each supporting device (14) in each case remaining at least substantially in a plane lying at right angles to the direction of the machine width and in the flow direction, and the corresponding supporting forces being individually introduced into the central part (1) and absorbed at least substantially in the respectively associated plane lying in the flow direction.
2. Headbox according to Claim 1, characterized in that supporting devices (14, 14') are fixed to two mutually opposite walls (4, 5).
3. Headbox according to Claim 1 or 2, characterized in that the central part (1) is subdivided into sections over the machine width.
4. Headbox according to one of the preceding claims, characterized in that the central part (1) is designed as a turbulence generator and preferably comprises a plurality of step diffusers.
5. Headbox according to one of the preceding claims, characterized in that the feed part (2) is subdivided into sections over the machine width.
6. Headbox according to one of the preceding claims, characterized in that at least one slice wall (4, 5) is mounted such that it can be pivoted about an axis (6) extending transversely with respect to the flow direction and/or displaced in the flow direction.
7. Headbox according to one of the preceding claims, characterized in that at least one continuous slice wall (4, 5) supported by a plurality of separate supporting devices (14, 14') is provided, its flexural rigidity in the transverse direction, that is to say in the direction of the machine width, lying in a range from about 5 × 10⁹ Nmm² to about 7.5 × 10¹⁰ Nmm² per 100 mm, measured in the flow direction.
8. Headbox according to one of the preceding claims, characterized in that at least one continuous slice wall (4, 5) supported by a plurality of separate supporting devices (14, 14') can be positioned section by section above the individual supporting devices (14, 14').
9. Headbox according to one of the preceding claims, characterized in that the various supporting devices (14, 14') are connected individually to the central part (1) and the relevant slice wall (4, 5).
10. Headbox according to one of the preceding claims, characterized in that the various supporting devices (14, 14') have amongst themselves at least substantially no transverse connections that transmit tensile, compressive and/or flexural forces.
11. Headbox according to one of the preceding claims, characterized in that at least one supporting device (14) associated with a pivotable slice wall (4) corresponds to a static model with at least three rods (57, 58, 59) which, at a distance from the central part (1) and the pivotable slice wall (4), are led together at least substantially at a junction (60), at least one rod (57) acting in the vicinity of the feed part (2) and at least one further rod acting on the central part (1) close to the pivot axis (6), and at least a third rod acting on the pivotably mounted slice wall (4), and in that the at least three rods (57, 58, 59) of a respective supporting device (14) are arranged in or symmetrically with respect to a plane which runs at right angles to the direction of the machine width and in the flow longitudinal direction.
12. Headbox according to Claim 11, characterized in that the rod (58) provided close to the pivot axis (6) acts indirectly or directly on the pivotably mounted slice wall (4).
13. Headbox according to Claim 11 or 12, characterized in that the length of at least one rod (57, 58, 59) can be varied.
14. Headbox according to one of Claims 11 to 13, characterized in that the position of at least one point of action of the rods (57, 58, 59) on the central part (1) and/or on the pivotable slice wall (4) can be varied.
15. Headbox according to Claim 13 or 14, characterized in that a respective change in all the supporting devices (14, 14') is in each case carried out in a similar manner and preferably in each case by means of a lifting mechanism (8), a pneumatic or hydraulic cylinder and/or an air spring bellows, via toggle joints associated with the rods (57, 58, 59) and/or as a result of the influence of temperature.
16. Headbox according to one of Claims 11 to 15, characterized in that the rod lengths and/or the position of the points of action in all the supporting devices (14, 14') can be changed simultaneously, in the same direction and uniformly, in order to move a relevant pivotable slice wall (4, 5) in the same way over the entire width measured in the direction of the machine width.
17. Headbox according to Claim 15, characterized in that the supporting devices (14, 14') in each case comprise at least one rod (57, 58, 59), to which a device for the individual additional fine adjustment of the slice wall (4, 5) is assigned.
18. Headbox according to Claim 17, characterized in that the fine adjusting devices assigned to the various supporting devices (14, 14') can be activated individually or jointly with others.
19. Headbox according to Claim 11, characterized in that the rods (57, 58) of the model described are used to form a single-part support (7, 10), which is supported on the central part (1).
20. Headbox according to Claim 11, characterized in that the rods (58, 59) of the model described are used to form a single-part support which is supported on the slice wall (4, 5) and which has a junction (60) at which the rod (57) acts.
21. Headbox according to one of the preceding claims, characterized in that the slice walls (4, 5) are constructed without stiffening ribs and stiffening profiles extending in the transverse direction.
22. Headbox according to one of the preceding claims, characterized in that, on the outer sides of the slice walls (4, 5), facing away from the flow, grooves (62) extending in the flow direction and serving to even out the stress are provided.
23. Headbox according to one of the preceding claims, characterized in that a non-pivotable slice wall (5) is provided, which is connected to a headbox foundation via ribs or profiles.
24. Headbox according to one of the preceding claims, characterized in that the distances of the divisions between the supporting devices (14, 14') associated with a respective slice wall (4, 5) are of equal size.
25. Headbox according to one of Claims 1 to 23, characterized in that the distances of the divisions between the supporting devices (14, 14') associated with a respective slice wall (4, 5) are at least to some extent different from one another.
26. Headbox according to one of the preceding claims, characterized in that the distances of the divisions between the supporting devices (14, 14') associated with a respective slice wall (4, 5) lie in a range from about 50 to about 1 000 mm and preferably in a range from about 200 to about 500 mm.
27. Headbox according to Claim 6, characterized in that the pivot axis (6) of the pivotable slice wall (4) is arranged close to the central part (1).
28. Headbox according to one of the preceding claims, characterized in that it can be pivoted about a transverse axis (24a) preferably provided in the region of the end (15) of the slice.
29. Headbox according to Claim 28, characterized in that two pivoting bearings (24) are provided, in each case arranged between a headbox side wall (23) and a lateral support (25).
30. Headbox according to Claim 29, characterized in that the supports (25) are fitted to a machine frame and/or a headbox foundation.
31. Headbox according to one of the preceding claims, characterized in that it can be pivoted by means of at least one adjustable supporting device (12), which acts indirectly or directly on the central part (1).
32. Headbox according to Claim 31, characterized in that the at least one supporting device (12) is provided at a distance from the end (15) of the slice, in the region of the central part (1).
33. Headbox according to one of the preceding claims, characterized in that it can be pivoted by means of a plurality of supporting devices (12), which are distributed over the machine width such that the deflection of the headbox structure in the transverse direction between and/or outside the supporting points is at least substantially equal.
34. Headbox according to one of the preceding claims, characterized in that its pivot axis, preferably provided in the region of the end (15) of the slice, is defined by guides (30) in which it is mounted appropriately.
35. Headbox according to one of the preceding claims, characterized in that it is mounted on at least one supporting device (12) which comprises at least two supporting units (40, 41), which define two supporting points having a different distance from the end (15) of the slice in the flow direction and execute different strokes, so that the headbox can be pivoted approximately about the end (15) of the slice.
36. Headbox according to one of the preceding claims, characterized in that, on the inflow side, the central part (1) is assigned an inlet plate (11) which serves to stiffen the central part (1) and/or as a fixing element for further functional elements and extends transversely with respect to the flow direction over at least substantially the entire width of the central part (1).
37. Headbox according to Claim 36, characterized in that the inlet plate (11) forms a part of the feed part (2).
38. Headbox according to Claim 36 or 37, characterized in that the inlet plate (11) extends beyond the height of the feed part (2).
39. Headbox according to one of the preceding claims, characterized in that at least one slice wall (5) is mounted on a support part (10) fixed to the central part (1), such that it can be displaced generally in the flow direction.
40. Headbox according to Claim 39, characterized in that the slice wall (5) can be displaced by at least one preferably mechanical, hydraulic and/or pneumatic adjusting device (48), which acts on the support part (10) and the slice wall (5).
41. Headbox according to Claim 40, characterized in that the adjusting device (48) comprises at least two rotary pins (50) which are mounted in the support part (10) and each have an eccentric extension (51) which engages in a groove (55) provided in the slice wall (5), the rotary pins (50) preferably bearing levers (52) with integrated pivotable nuts (53), which can be actuated by a common adjusting spindle (54) having opposite threads.
42. Headbox according to Claim 41, characterized in that the respective eccentric extension (51) can be detached from the relevant rotary pin (50).
43. Headbox according to one of the preceding claims, characterized in that the feed part (2) is supplied with fibrous suspension via individual supply holes (18), and the supply holes (18) are connected either to relatively long individual hoses (3) or directly to a common manifold (19), which is arranged substantially parallel to the outlet gap.

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