FI87588B - Loading device for the wire in a paper machine - Google Patents

Abstract

A loading device 10 for a wire 40, 50 in a paper machine, by means of which loading device a mechanical load is directed at the wire 40, 50 of the paper machine. With this load a pressure pulse is directed at the fibre layer that is supported by the wires or is present between the wires 40, 50, or at the web W. The pressure pulse promotes drainage from the web W, improves the formation of the web W and/or controls transverse profiles of various characteristics of the web W, such as drainage, distribution of the filler, formation and/or retention. The loading device 10A; 10B; 10C; 10D; 10E comprises a disc-shaped spring leaf 11, the face of which is arranged essentially in the direction of the run of the wire or wires 40; 50 so as to drag against the inner surface of the wire loop 40; 50 in order to produce a pressure pulse. The spring leaf is fixed outside the drag area at the frame part 12 of the load device. By means of the said frame part 12 and/or the loading devices 16, 17, 20 a load force is generated, which produces the said pressure pulse and bends the said spring leaf 11 in the direction of the machine. <IMAGE>

Description

5 87 5S8

Paper machine wire load device Belastningsanordning för viran i en pappersmaskin

The invention relates to a paper machine wire loading device for applying to a paper machine wire, preferably over its entire width, a mechanical load by means of which a pressure pulse is applied to a fiber layer or web in the wire support or between the wires to promote dewatering, improve web formation transverse profiles of different web properties such as dewatering, filler distribution, formation and / or retention profiles.

15

Several different forming members are used in the web forming sections of a paper machine. The main purpose of these members is to provide a pressure pulsation in the resulting fibrous layer, which promotes dewatering of the forming web and at the same time improves its formation. For Li-20, a number of different forming shoes, usually with a curved strip cover, are already known, over which the overlapping forming wires and the web between them are curved. In the area of these forming shoes, water is discharged mainly through the wire on the outer curve side due to the tightening pressure which is aided by the centrifugal force field. The strip cover of the forming shoe provides a pressure pulsation which promotes dewatering and improves the shape of the web.

In addition, various suction boxes and rolls, register rollers, forming and foil strips, and scrapers are already known for providing a pressure difference and pulsation in the fibrous layer formed to promote web formation and dewatering.

As an example of the prior art 35 most closely related to the present invention, reference is made to U.S. Patent Nos. 2,881,676, 3,438,853 and WO 91/02842.

2,87588

The aim is to construct the headboxes and web-forming parts of the paper machine in such a way that paper homogeneous in weight, shape and strength properties over the entire width of the web can be produced, from which as little as possible the edges of the web would have to be cut off. Paper, especially fine paper, is required to have even greater structural uniformity, which is required by the recently introduced printing and copying methods in which the sheet is heated very quickly and hard.

One important requirement for making homogeneous paper is that the major axes of the directional distribution of the fiber network of the paper coincide with the directions of the major axes of the paper and that the orientation be symmetrical with respect to these axes. For example, in copy papers, it is important that their top and bottom orientations are substantially the same.

In order to achieve the above-mentioned objects, various solutions for controlling the head suspension pulp flows have been used, for which reference is made, for example, to the applicant's FI patent 75377. However, even after the headbox there is a need to control the transverse homogeneity of paper produced by various means, e.g.

20 cross-sectional profiles of dewatering, filler distribution and retention web.

A disadvantage when using previously known forming members are e.g. damage to the wires due to dirt particles passing between the sliding surfaces of the forming members and the wires, which may. causes flattening and / or displacement of the wire fibers and thus wire damage. Particularly emphasized, this disadvantage occurs when the two wires are confronted against two "hard" abutment members, such as forming strips, between which the wires 30 and the fibrous web between them have to pass.

The previously known web-forming members are generally heavy in structure and exhibit transverse deflection, a disadvantage which greatly increases as the widths of the paper machine increase. Profiling of the pressure pulsation intensity i 3 87588 caused by said known forming means in the transverse direction of the web is generally not possible without expensive special arrangements.

The constant increase in the speeds of paper machines has also brought with it 5 ever-increasing demands on various web-forming members.

The object of the present invention is to provide a new device for loading the wire of a paper machine so that the disadvantages discussed above can be substantially avoided.

10

The object of the invention is to provide a lightweight wire loading device which is not generally intended to change the direction of the wire or fibrous web in the two-wire zone, but to cause a pressure pulse suitable for the wire and through the fibrous web to promote dewatering, formation and / or retention. reaction.

It is an important object of the invention to provide a lightweight wire loading device which can control various transverse profiles of the web 20 such as dewatering, dry matter, filler distribution, retention, formation and, in exceptional cases, also the basis weight profiles.

It is a further object of the invention to provide a very lightweight wire loading device which is able to react quickly to dirt particles passing between the loading member and the wire of the loading device so as not to cause damage to the wire and the loading member.

It is a further object of the invention to provide a profilable wire loading device in which even considerable transverse deflections can be allowed, since they can be compensated by profiling.

It is a particular object of the invention to provide a device for loading a wire which is particularly suitable for use in two-wire forming zones of arc-35 within a wire loop on the outer curve side.

4,87588

In order to achieve the above and later objects, the invention is essentially characterized in that the loading device comprises a plate-shaped spring blade, the side of which is arranged substantially tangential to the wire or wires running. to a part, by means of which a load force is produced by the body part and / or the loading devices, which bends the spring blade in the machine direction and produces said pressure pulse.

10

In a preferred embodiment of the invention, the spring blade extends in the transverse direction of the web and the wire over its entire width as a unitary structure. Most preferably, the spring blade is fitted "co-in" with the wire and web running, which helps prevent damage to the fiber blades and increases the flexibility of the spring blade.

The loading device provided with a spring blade according to the invention is suitable for use in the web-forming section in several different positions, generally in the double-wire region, but also even in the guitar area of the kit.

20

The loading device according to the invention enables versatile controls and adjustments of cross-sections, in which, if necessary, closed on-line control systems based on the measurement of different profiles can be used.

25

In the following, the invention will be described in detail with reference to. ·; to some application examples of the invention shown in the figures of the accompanying drawing, to the details of which the invention is in no way: · narrowly limited.

Fig. 1 shows a hybrid former with an MB unit ("MB" trademark) having wire loading devices according to the present invention in various positions.

Figure 2 shows a kit with an MB unit in which several wire loading devices according to the invention have been used.

li 5 87588

Figure 3 shows the arrangement of the wire loading devices according to the invention on the two-wire web-forming sector of the former roll or suction roll.

Figure 4 shows the placement of a group of wire loading devices according to the invention on and after a forming shoe with a curved closed or open strip cover.

Figure 5 illustrates the use of the loading devices according to the invention in the guitar area of the groove former and in the subsequent bending sector of the forming roll.

Figure 6 shows, in machine direction, a vertical section of the arrangement of a group of loading devices according to the invention inside a lower wire loop in a two-wire straight forming zone with 15 successive dewatering strips inside the upper wire loop.

Fig. 7 is a schematic view from the machine direction of a loading member with which the blade load of the device can be profiled.

Fig. 8 shows graphically the line pressure of the loading member according to Fig. 9 along the length of the blade.

Figure 9 shows a machine direction vertical cross-section of a load element according to the invention with its profiling devices.

25

Figures 10, 11 and 12 show, as a machine direction vertical section, some alternative implementations of the loading device according to the invention.

Figure 13 shows a loading device with a rather wide and thus low surface pressure loading range.

Fig. 14 shows, for example, the arrangement of the wire loading device shown in Fig. 13 for wet pressing in a two-wire sector 35 of a forming roll.

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Figure 15 shows an example of perforation of the load blade tip.

Fig. 16 shows a section A-A in Fig. 15.

Fig. 17 shows the placement of a loading device according to the invention, e.g. between or in one of the strips of the drainage box or forming shoe shown in Fig. 1 or the forming shoe shown in Fig. 4.

Fig. 18 shows a loading device according to the invention placed to enhance the operation of the deflector.

Figure 1 shows an example of such a hybrid former in which the loading devices 10a, 10b, 10c according to the invention can be applied in several different positions.

The loading device 10 comprises a thin plate-shaped spring blade 11, the tip 11a of which is rounded. The spring blade 11 extends as a unitary structure over the entire width of the web W and the wire. In the region of the tip 11a of the spring blade 11 there may be a perforation 11c shown in Figs. 15 and 16, to which we will return later. The Jou-c blade 11 loads and drags the 40/50 inner surface of the wire on its wide side. At its opposite edge, a spring blade 11 is fastened between the fastening pieces 13 and 14 in connection with the body part 12 of the loading device 10. The fastening of the spring blade 11 is ensured by grooves 15 in connection with the fastening piece 14 together with the perforations 11d according to Fig. 15.

It is essential for the structure and material of the spring blade 11 that the blade 11 acts as a disc spring, which is curved at one end to produce a drag and load pressure against the wire 40.50.

The blade 11 is stationary and preferably drags the wire 40.50 loaded into the "sock". Thus, the fastening pieces 13,14 of the blade 11 are in the direction of travel of the wires 40,50 before the towing and loading area of the spring blade 11.

The former shown in Figure 1 comprises a lower wire 40 guided by guide rollers 43. After the headbox 45, the lower wire has a single-wire pattern 40a into which the headbox 45 feeds the lip jet J. With the single-wire initial section 40a, water is drained through the lower wire 40a The two-wire zone 5 starts at the guide roll 54 of the upper wire 50. This is followed by an MB unit 60 modified by a two-wire zone with the loading devices 10k of the invention. After the MB unit 60, the two-wire zone curves upwards on a hollow surface 55 'forming roll 55, followed by a forming shoe 41b with a strip cover 42. The two-wire zone then follows an oblique run with planar simulations 47. The upper wire 50 is separated from the lower wire and the web W is transferred over the suction roll 49 to the pick-up felt 70 in the suction zone 71a of the pick-up roll 71. If the MB unit 60 is not used, the running of the upper wire 50 may follow the path 50 'shown by the dashed line.

15

According to Figure 1, there are loading devices according to the invention in the unit of the subunit 46 of the MB unit 60, as shown in more detail in Figure 6. At the forming roll 55, the loading device 10a acts inside the loop of the lower wire 40, and correspondingly there is a loading device 10b on the cover 42 of the forming shoe 41b. On top of the leveling box 47 is the last loading device 10c. One or more loading devices 10 may be enabled or disabled as needed.

... Figure 2 shows a two-wire former in which several loading devices 10 d, 10 e, 10 f, 10 i, 10 j according to the invention are applied. The lip portion of the headbox 45 feeds the pulp suspension jet J to the forming bed G, after which a two-wire zone begins on the forming roller 43a. Opposite the covering wire 50, in the region of the groove G, there is a first loading device 10i and then, on the two-wire curved sector 30 of the forming roll 43a, a second loading device 10j. After the forming roll 43a, the wires 40.50 have a common straight run with directly opposite or spaced load devices 10d. This is followed in a two-wire zone by a first modified MB unit 46A.60A and then by a corresponding inverted unit 46B, 60B, 35, the basic structure of which can be found, for example, in the applicant's FI patent application No. 8 87588

In Fig. 2, after the latter MB unit 46B.60B, two opposing loading devices or a corresponding device 10e at a small distance in the direction of travel of the web W follow. The two-wire zone curves downward in the sector of the latter forming roll 43b. This sector 5 has a loading device 10f. The web W is separated from the covering wire 50 and follows a carrier wire 40 from which the web W is transferred to the pick-up fabric 70 in the suction zone 71a of the pick-up roll 71.

In the following, the main features of the loading device according to the invention will be briefly described, mainly with reference to Figures 9-12.

Figure 3 shows a group of loading devices with four successive loading devices 10f in a two-wire web-forming zone 40.50 in the curved sector of the roll or suction roll 10. The group of peeling devices 10f 15 is inside the loop 40 of the outer wire to give a pressure pulse against the inner surface of the wire to promote dewatering, to improve the formation and / or, if necessary, to control the different transverse profiles of the web W.

Figure 4 shows the use of an array of four consecutive loading devices 10g on the opposite side of the guide cover 42 of the curved (radius of curvature R) in a two-wire zone, the outer wire dragging against the inner surface of the loop 40. In addition, it is presented. a load member 10h arranged after the forming shoe 41. ; 25 shoes for 41 straight runs of wires 40.50. One or more loading devices may be in use and installed as required 10.

Fig. 5 shows in more detail the groove area of the gutter former, in which the lip part of the stem-30 rod 45 feeds a mass jet into the gut G between the wires 40 and 50, which is determined between the runs of the wires 40 and 50 guided by the rollers 43 and 51. For the running of the outer wire 50 between the breast roll 51 and the forming roll 43, a wire loading device 10 according to the invention is arranged so that its spring blade 11 acts on the wire 50 35 in the area where the pulp suspension jet J meets or just before the wire 50 or wires 40/50 . Thereafter, there is a dewatering member 53 within the loop 50 of the wire 50, followed by a second loading device 10j acting against the inner surface of the loop 50 of the wire 50, the spring blade 11 pressing the inner surface of the outer wire 50 loop to promote dewatering, improve formation and / or different cross-sections. for adjustment. Only one of the loading devices 10 can be used, if necessary, 10i; 10j or both devices 10i and 10j.

Fig. 6 shows, for example, the beginning of the two-wire zone of the former according to Fig. 1. The overall structure of the former shown in Figure 6 may be similar to that shown in Figure 1. The disadvantage of these formers is the damage to the wire, in particular due to the pulp bundles and patterns, which are caused in particular by the load bars against the "hard hard". In order to prevent these drawbacks and to achieve other objects of the invention, a group of wire loading devices 10 according to the invention with a spring blade 11, which are fastened to the body part 53, are arranged inside the loop of the lower wire 40 against the load strips 66 15.

The load strips 66 of Figure 6 have a wear member 67 whose planar surface slides against the inner surface of the outer wire 50. The pieces 67 are connected to the load strips 66 by a salmon-20 tail joint 68. The leading edge 67 of the pieces has a steel edge 69 which effectively removes water from the inner surface of the wire 50. The load devices 10 k, 10 1, 10 m and 10 n according to the invention are dragged and loaded against the inner surface of the wire 40. In the direction of travel F of the wires 40 and 50, the area of action of the first device 10 k against the wire 25 40 is between two load strips 66. The load range of the next load device 10 1 is at the list 66 as is the load range of the next load device 10 m. The load range of the last load device 10 m is at the last list 66. The body portion 53 is positioned in suitable guides (not shown) so that the body portion 53 as a whole can be moved vertically by power devices 54, which are shown only schematically. Thus, the towing force of 10 k-10 n of the loading devices can be adjusted. In addition, the last loading device 10η is provided with profiling devices 17l.k, 20, which will be seen in more detail in Fig. 9. These profiling devices include a hose 20, through which the loading force of the spring blade 11 of the last loading device 10 n is adjusted. against the inner surface.

10 87 588

Fig. 7 is a schematic machine direction view of an embodiment of a blade load force profiling hose 20. The hose 20 is divided in its longitudinal direction into compartments 201 ... 20N, to each of which the pressure P ^ - .P of the separately adjustable air 5 or other medium can be passed through the pipes 231 ... 23N, by which the transverse distribution of the force (line pressure) can be influenced. the tip region of the spring blade 11 compresses the surface of the opposing wire 40; 30. Thus, different cross-sections of the resulting fibrous layer or web W can be adjusted, such as dewatering, formation, filler distribution, retention 10 and / or basis weight profiles.

Fig. 8 shows the distribution of the line pressure (kN / m) caused by the spring blade 11 of the loading device 10 according to Fig. 9 along the blade length (in the machine direction) at different blade angles, namely blade 11 with tip, blade 11 following wire and blade at zero angle. It can be seen from Figure 8 that the length of the loading area A0 in the longitudinal direction of the blade 11 depends crucially on the blade angle. Angle a = 15 ° of the bracket 13. In Figures 8 and 9, the blade length L to 100 mm and the blade thickness S to 0.25 mm. In this case, the ratio L / S-400, which is important for the operation of the spring blade 11 according to the invention.

20

Some preferred embodiments of the loading devices according to the invention will now be described with reference to Figures 10-13.

According to Fig. 10, the loading device 10A comprises a body part 12, in connection with which a spring blade 11 with a straight or rounded tip 11a is connected by fastening parts 13, 14, 15. In connection with the front side of the body part 12, an intermediate frame 22 is arranged, to which a series of adjusting spindles 17 ^ (k) of adjusting spindles are connected side by side. The adjusting spindles 17 apply an adjustable force via an elongate flexible spacer 16 to the spring blade 11 to control the line pressure profile of its load force in the transverse direction of the web W. The control spindle 17 act in the direction of the arrow P and operate in the same way as e.g. a headbox list for presetting a paper coating device or the like for presetting the coating blade. There are adjusting spindles at certain intervals, preferably evenly-35 Sat - 100 ... 200 mm. In this case, the number k of the adjusting spindles is generally k <100. In Fig. 10, the body portion 12 of the loading device 10A is fixed and the magnitude and transverse profile of the line pressure applied to the wire by the spring blade 11 87588 11 is adjusted by the adjusting spindles 17 shown above.

In the arrangement of the loading device 10A, it is essential that the spring blade 11 5 is positioned parallel to the direction of travel of the wire 40.50. The water leaving the web W through the wire 40; 50 acts as a lubrication area for the towing area of the spring blade 11. If necessary, the loading device can also be equipped with water supply devices which lubricate the drag area of the blade 11, e.g. during start-up of the paper machine and other operating disturbances.

10

Fig. 11 shows a loading device 10B which does not have the possibility of profiling the line force of the load force, but the line pressure of the load force is arranged to be adjusted in its first plane by first force means 24 by pressing the body part 12 in Fig. the extent of the area of influence changes. In addition, the load force is arranged to be adjustable by rotating the body part 12 about an axis 36 (angle α) by power devices 25. Said power devices 24,25 can be arranged to act on both ends of the body part 12 at both edge regions of the rack W.

The structure of the loading device 10B as well as other loading devices can be e.g. such that the body part 20 is attached at both ends • - e.g. to shaft pins which or whose supports 25 are fixedly attached to the power devices or to the body of the paper machine; parts. The power devices 24 and / or 25 are preferably a pair, one of which is on the treatment side of the paper machine and the other on the operating side of the paper machine.

Fig. 12 shows a loading device 10C according to the invention, the line pressure of the load force of which is arranged to be adjustable over its entire plane by a load hose 20 into which an adjustable pressure is applied which determines the drag force applied by the spring blade 11 against the wire 40. The transverse profile of the load force is arranged to be adjustable by placing a series of diaphragm resistors 19b above the load area of the blade 11, to which adjustable heating currents i 37-88 are supplied by electric wires 18 ^. The film resistor set 19b is covered with a thin thermal insulator 19a. By adjusting the electric currents I1.k, the temperature distribution of the load area of the spring blade 11 can be influenced and by means of this the distribution of the elastic coefficient of the load area of the spring blade 11. Thus, the transverse distribution of the load force 10C of the device 5 can be adjusted.

In this case, it is preferred that the blade material is selected so that the coefficient of elasticity changes with a substantially small change in temperature. A suitable material is, for example, plastic.

Fig. 13 shows a loading device 10D according to the invention, in which the length of the loading area of the spring blade 11 in the machine direction is made quite large by using a large diameter loading hose 20. The tip area 11b opposite the 22 into the groove 22a so that the load hose 20 remains inside the trough formed by the blade 11. This results in a relatively closed structure that is permanently clean. The hose 20 is loaded via a flexible spacer 21 with the above-described series of adjusting spindles 17 for adjusting the load force profile.

20

Figure 14 shows an application of a loading device 10E according to the invention in wet compression. The wet pressing takes place in a sector A0 of the forming roll 43, the sector size of which is preferably of the order of Ag = 200 mm. The hose 20a is quite wide and gently aligns with it. . Wet compression at a relatively low pressure in the fibrous layer between the wires 40 and 50, the dry matter content of which is still quite low, at least ka - 8%, typically ka> 10%.

According to Fig. 17, e.g. the strip or strips opposite the wire 50 of the dewatering box 60 30 according to Fig. 1 can be replaced by a loading device 10p according to the invention, the spring blade 11 of which drags forward. against the inner surface of the wire 50. As shown in Figure 17, the list 66a has. * ··. the spring blade 11 of the loading device 10b according to the invention fastened by the fastening piece 14. The corresponding arrangement can be e.g. in the strip cover 42 of the forming shoe 41b according to Fig. 13 or in the strip cover of the forming shoe 41 according to Fig. 4.

i3 8 7 5 8 8

Fig. 18 shows a loading device 10b according to the invention for enhancing the operation of the deflector 80. The mating surfaces 81 of the deflectors 80, of which only one is shown in Fig. 18, guide the wire 40 so that it curves with a relatively large radius of curvature R, which radius of curvature is e.g.

5 R = 5000 mm. Attached to the strip 66a inside the loop of the wire 50 by a fastening piece 14 is a spring blade 11 of a loading device 10 according to the invention, the loading area of which is at the abutment surface 81 of the opposite deflector 80 to enhance the operation of the deflector 80. The loading devices 10p according to the invention may be present at one or more deflectors 10 to enhance their operation in accordance with the principles set out above.

As already indicated above, the spring blade 11 is a reversibly bendable plate-like spring material. It is also essential that the ratio of the length L of the spring blade to the thickness S of the plate material of the blade is in a certain range. The ratio mentioned in the invention is selected from the range L / S to 10 ... 1000. Optical applications are usually found in the range L / S - 300 ... 500. Said ratio L / S also depends on the material of the spring blade. The blade material used is preferably wear-resistant spring steel, e.g. stainless steel-20. Some plastic materials and composite and sandwich structures may also be considered. The spring blade 11 does not necessarily have to be of uniform thickness or of the same material or structure over its entire length or width.

; It is also essential in the structure of the spring blade 11 that its spring function so that by loading the blade 11 the loading devices cause the shape of the blade plate to bend in the machine direction with a relatively large radius of curvature R0 = 200 ... 1000 mm under elastic conditions and loads and a wide tensile range The material 30 of the spring blade 11 must thus be suitable for its spring properties and must not undergo permanent deformation. The spring blade 11 is dimensioned and the spring properties of its material are generally selected so that the spring constant of the blade bend per meter of width is in the range 1.6 to 0.02 kN / mm, preferably in the range 0.1 to 0.03 kN / mm. The spring constant, in particular in composite structures 35, can be different in the machine direction and in the cross direction.

U B7B8B

The area of the spring blade 11 which will load and rub against the wire 40.50 can, if necessary, be provided with a wear piece or a wear-resistant coating, e.g. a ceramic layer, shown in Fig. 9 by a broken line and reference number 11k.

5

In order to promote the removal of water from the towing and loading area of the spring blade 11, it is advantageous to provide the area of the tip 11 of the blade with perforations exemplified in Figures 15 and 16. A series of holes 11c are stamped in the transverse row 10. The diameter of the holes 11c is e.g. - 5 mm and the pitch - 10 mm. The perforation lld is for the mounting grooves 15. The tongues 27 formed in the making of the holes 11c and lld are bent in the drag area of the spring blade 11 and on the opposite side of the side facing the wire 40.50.

The following claims set forth within the scope of the inventive concept defined by the invention may vary and differ from those set forth above by way of example only.

Claims (10)

A paper machine wire (40,50) loading device (10) for applying to the paper machine wire (40,50), preferably over its entire width, a mechanical load by means of which the fiber support in the wire support or between the wires (40,50) or applying a pressure pulse to the web (W) to promote dewatering from the web (W), improve web (W) formation and / or control transverse profiles of various properties of web (W) such as dewatering, filler distribution, formation and / or retention cross-sections, known in that the loading device (10A; 10B; 10C; 10D; 10E) comprises a plate-shaped spring blade (11), the side of which is arranged to pull the pressure pulse substantially tangentially to the inner surface of the wire (40; 50) and that said spring blade (11) is attached from outside its towing area to a body part (12) of the loading device, the body part (12) and / or the shell of which by means of the measuring devices (16,17,20) a load force is applied which bends the spring blade (11) in the machine direction and which produces said pressure pulse. 20 Loading device according to Claim 1, characterized in that the ratio of the machine direction length L of the spring blade (11) to the thickness S of the flexible sheet material S of the spring blade (11) is selected from the range L / S to 10 ... 1000, preferably from L / S to 300 ... 500. : 25 Loading device according to Claim 1 or 2, characterized in that the loading device is arranged to operate "parallel" to the direction of travel of the wire (40; 50) against which the spring blade (11) drags so that the spring blade (11) is fastened to the wire or on the input side of the wires 30 (40.50). Loading device according to Claim 1, 2 or 3, characterized in that the spring blade (11) is loaded by applying a load force to the body (12) extending over the entire transverse length 35 of the spring blade (11) by means of a force (24) acting on the wire (s). 40,50) in a direction substantially perpendicular to the plane of travel and / or by turning said body part (12) about the transverse transverse axis (26) by means of power devices (25). Loading device according to one of Claims 1 to 4, characterized in that the transverse distribution of the line pressure in the traction region of the spring blade (11) is arranged to be adjustable and controllable by means of applying an adjustable force field to the opposite side of the spring blade (11). Loading device according to claim 5, characterized in that said line pressure profile control device is a series of adjusting spindles (17), 17 of which are actuated by actuators to control the line pressure in the traction region of the spring blade (11) (Figures 9 and 10). Loading device according to Claim 5 or 6, characterized in that the spring blade (11) profile adjustment device is a tubular member (20) divided in its longitudinal direction and in the transverse direction of the web (W) into compartments (201 to 20N). controllable adjustable pressures of the pressure medium such as air (P ^ .- Ph). 20 Loading device according to one of Claims 1 to 7, characterized in that the distribution of the drag area of the spring blade (11) is controlled by adjusting the transverse temperature distribution of the spring blade (11), for example by electric heating devices (18, 19a, 19b) (Fig. 12). 25 Loading device according to one of Claims 1 to 8, characterized in that the towing area of the spring blade (11) is provided with a wear-resistant wear piece and / or a coating (IIk), for example a ceramic body or a coating (Fig. 9). 30 Use of a loading device according to any one of claims 1 to 9 in the counter unit (46) of the suction dewatering unit (60), on the curved spectrum (10A) of the web forming roll (55), on the outer wire side (10B) of the forming shoe in the two-wire zone, on the two-wire zone 50) inside to align I: 17 87 588 or at a small mutual distance (10d, 10e) and / or in the region of the formation crystal (10i). 1, 87588