FI112813B - Multilayer headbox adjustment system - Google Patents

Description

112813

Multilayer headbox control system Reglersystem för en flerskiktsinloppsläda 5

The invention relates to a feedback control system for a multilayer headbox of a paper or board machine, which multilayer headbox comprises N, N-2, overlapping pulp suspension flow channels extending from each other at least close to a mouth a forming kit comprising a control unit and a setpoint unit to which control values are derived from the headbox system and from which control units control values are obtained to control the actuators of the headbox system.

15

As is already known, a pulp-jet-jet jet is fed to the forming wire or, in double-wire formers, to the forming wire between the wires via the lip channel of the headbox of a paper machine. One important papermaking control parameter is the so-called spray ratio, ie the ratio of the velocity of the mass jet discharged from the headbox lip to the velocity of the wire (s).

: ‘20 Instead of the speeds mentioned, the absolute difference between these speeds can also be used as this control parameter. This parameter can help to control: · the formation of the resulting web, also to some extent in its z-direction.

; It is already known that in the manufacture of paper and board the so-called multilayer ankle and multilayer headboxes. Multilayer headboxes have two or more overlapping pulp suspension feed channels, which can extend apart from each other all the way to the lip opening or even to the area of the forming crystal. Different raw material can be fed to said different feed channels. In multilayer headboxes, it is also possible to • apply such a technique that different masses are produced from the same base mass into the surface and middle layers of the web by different additions of fillers and fillers. For this technique, reference is made, by way of example, to Applicant's Patent Publication 92,729 (corresponding to EP-A-94 115 765 and U.S.-A-08/323 839).

2 112813

In the production of printing and writing papers, a process has recently become a particularly interesting papermaking technique in which the middle layer of paper is made of a different pulp than the surface layers. This manufacturing technique provides the papermaker with a tool to tailor the final product so that the most suitable fibrous material can be placed in the correct layer of paper 5 so that the surface layers and the inner layer can be optimized independently of each other. In this case, for example, the printing and writing paper can be produced from three layers, in which the surface layers are formed of chemical fibers and the middle layer of mechanical and / or recycled pulp. Also in this technique, a multilayer headbox with, for example, three overlapping layers is applied.

10

The multilayer headbox is a difficult object to adjust because the multilayer process has several different parameters with different cross-effects, which may still depend on the raw materials used, the quality to be manufactured and / or the geometry and driving style of the headbox. However, in the production of a qualitatively sound paper product, especially printing and writing paper using multilayer technology, the speed and flow rate ratios of the different layers and the setting of these parameters in relation to the wire speed must be sufficiently precise.

For the state of the art known to the applicant in connection with the present invention, reference is made to U.S. Patents 4,764,253 and 4,526,653, DE Patents 38,359,903 and 44,239,695.

With regard to the state of the art most closely related to the present invention, reference is further made to the journal article Tappi Journal, September 1987, pages 49-52, Gunnar Stenberg: 25 "A new headbox for multilayered printing paper". Of the present invention ’. substantially differently, this leaf article specifically uses a multilayer headbox in which the different layers of the lip channel are separated by fixed partitions and the web is formed from three separate jets held apart by air wedges deep up to the forming ladder. The research results and ideas presented in this journal article can to some extent also be applied in the control system according to the present invention.

.112813 3

The main object of the invention is therefore to provide a new control system with which the multilayer box can be better controlled with the aim of producing an even better cardboard or paper product, especially printing and writing paper, which meets ever more stringent quality requirements, using raw materials economically.

5

It is a particular object of the invention to provide a multilayer headbox control system by which a paper product, especially printing and writing paper, can be produced more economically using different raw materials, e.g. so that the middle layer of paper is made of mechanical pulp and / or recycled pulp surface layers 10.

It is a particular object of the invention to provide a multilayer headbox control system which achieves the above objects and which makes it possible to drive different amounts into different pulp layers, while maintaining the total weight of the web, i.e. the basis weight of the product to be manufactured.

It is an object of the present invention to make more efficient use of the physical models which have been or may be developed for multilayer webbing on the basis of the research results obtained.

20

In order to achieve the above and later objects, the invention has *. mainly characterized in that said measured values include the measured value of the average headbox lip passage pressure and the measured value (s) of the different sub-flow rates or flow rates of the headbox system approach lines and / or the ratio or ratios of said measured values to the total mass flow rate. and / or corresponding measured values, and that said average pressure is measured from such '. at the point of the lip passageway with hetero-headings of the headbox, which gives the 11 .. ’indication of the average headbox pressure.

When measuring the average pressure of the different subchannels in the preferred embodiment of the invention, the average velocity of the lip jet can be controlled, although the pressures between the different subchannels may not be fully equalized due to the flexible hetulas. The measurement of the average pressure can be carried out by using a pressure sensor whose measuring area extends over a sufficiently large number of sub-channels.

The adjustment method according to the invention is applied synergistically precisely in connection with a hetero-headbox in which the torches of the lip channel of the headbox can be positioned and / or bent. In the hatch head box, the pressures of the different channels separated by the hetulas measured from the same point in the direction of flow may differ depending on the flow ratios, the stiffness and the length of the hetulas.

10

By means of the control system according to the invention, it is possible to control, for example, the static pressure of the central channel and the flow ratios between the different channels. The control system according to the invention makes it possible to drive varying amounts of mass into the different layers of the multilayer web and yet to keep the total mass weight constant.

15

Furthermore, when the invention makes it possible to control the speed ratios of the different layers of the web formed and thus the speed differences, the mixing of the different layers and thus the z-direction formation of the web can be influenced to produce an optimal paper product from economical raw materials.

;; 20,; In the invention, the so-called multivariate control based on multi-! variable process model. The multivariate process model used in the invention may be advantageous. be in matrix form. The elements of the model are, for example, step responses, impulse responses, transfer function parameters or so-called when applying space control to the system in question i. . 25 coefficients of a differential or differential equation assembled into a matrix. Model-dependent control can also be used in multimode technology.

Other controls of the paper machine can also be integrated into the control system according to the invention, for example the dilution control of the basis weight of the paper web cross-sectional direction (CD); ‘* 30 work, for which reference is made by way of example to the applicant's above-mentioned FI patent application 970140 and the attached Figure A.

5 112813

In the following, the invention will be described in detail with reference 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.

Figure A schematically shows a pulp feed system with a dilution control of a headbox CD basis weight profile and its control system, which is known as the background and application environment of the invention.

Figure 1 shows a machine direction vertical cross-section of a three-layer headbox, in connection with which the control system according to the invention is preferably applicable.

Figure 2 shows a lip section of a four-layer headbox with three overlapping articulated tips in a machine direction vertical cross-section.

Fig. 3 schematically and partly as a block diagram shows a first embodiment of a control system according to the invention.

Fig. 4 shows a second embodiment of the control system according to the invention in a manner similar to Fig. 3.

20

Fig. 5 shows, in a manner corresponding to Figs. 3 and 4, a third embodiment of the control system according to the invention.

Figure 6 shows in principle a block diagram of another embodiment of the invention. 25

Figure A shows schematically the headbox mass system and the control system controlling the headbox very schematically. The headbox shown in Figure A is the so-called therefore, the purpose of the single layer headbox and Figure A is only to illustrate one application environment of the present invention more broadly than other figures.

30 6 112813

Figure A also shows a headbox control system 100 for controlling the paper machine CD-oriented profiles, the dilution ratio, and the speed of the lip jet J of the headbox 10. The lip jet J of the headbox 10 is discharged by forming wires (not shown) to limit the forming gap. In papermaking, one important control parameter is the ratio of the speed of the additional jet J to the speed of the forming wires (not shown). The pulp feed system shown in Figure A includes a wire well 61 connected by a pump 62 to a short circuit 70 of a paper machine to provide a mainstream flow FM through a mains pipe 67 to a headbox 10 manifold 11. A first dilution pump 63 of dilution fluid is connected to the wire well 61. The diluent is supplied from the deaerator 65 by a pump 64 through a pressure screen 66 to a log 72 which may be separate from or integrated with the manifold 11, e.g. as described in the applicant's above-mentioned FI application 970140, also comprising edge feed control arrangements adapted to the headbox area for fiber orientation profile management. From the manifold 72, the dilution flows FDi ... FDn through the control valve timer 71i ... n are fed to the manifold 13 of the turbo-lens generator 12 of the headbox 10 and further through the lip channel 14 to a pulp jet J.

In the headbox 10 according to Fig. 1, the headbox flow, such as the flow FM, Fig. 20 in Fig. A, is divided into three different bed flows Fr, F2, F3, which are separated from each other all the way to the ends of the lip channels 14i, 152. Layer flows F1, F2 and F3 can; ‘May, in principle, consist of different raw materials in the same way as the flow FM shown in Figure A; streams or sub-streams formed with different additives and fillers from the same basic raw material, as described, for example, in more detail by the applicant.

In FI patent 92 729. Each overlapping layer of the headbox 10 has its own manifold lii, II2, II3, from which the flow is led to the turbulence generator 12 and; further to the manifold 13. The flows are directed from the manifold 13 to the lip channel 14.

In the lip channel 14, the flows are separated from each other by hetero-inlets 15i, 152, the initial ends 7 '15a of which are pivotally articulated in connection with the end of the manifold 13. The hubs 15i, 152 '·' * 30 can be turned to different positions. The hubs 15i, 152 are to some extent flexible <»» '· material, so they can also bend. In particular, due to the flexibility of the hetulates 151, 152, the pressures of the partial mass flows can be equalized at least to some extent. The invention is preferably applied precisely in a headbox in which the lip channel has overlapping hetulas, by means of which the lip channel is divided up to or close to the lip opening into subchannels, where the flows cannot mix but the pressure can equalize due to the movement of the hetero structure.

The control system according to the invention can be applied in headboxes with two or more overlapping layers, and the general case of using N (N-2) overlapping layers is also shown below, in which case the lip-10 channel 14 has N-1 overlapping hetulates 15.

The headbox 10 shown in Figure 1 does not have a so-called a compensating chamber, but the invention can equally well be applied to headboxes in which the manifolds 11 | ... 11 ^ are followed by manifolds, followed by compensating chambers (N pcs.), followed by 15 turbulence generators and a lip channel 14 divided into subchannels at 155 · 15N -1 ·

According to Figures 3 to 5, the headbox 10 is fed by three separate feed pumps ... § 20 j, 2Ο2 and 2Ο3. The mass flow is directed through machine screens (not shown) to the manifolds 11j, 112 »113 feeding the different t · 20 layers of the headbox 10 (Fig. 1).

Fig. 2 schematically shows the lip portion 14 of the four-layer headbox, which may be preceded by ‘; e.g. a headbox 10 as shown in Fig. 1 with four overlapping dividers 11j ... 114 and which may also be provided with compensating chambers. As shown in Figure 2, the lip channel 14 has three overlapping hetulaes 15j, 152 and 153 delimiting; ':: Together with the upper wall 14a and the lower wall 14b of the lip channel 14, four overlapping': flow channels through which the mass suspension partial flows Fj, F2, F3 and F4 flow. Hetulat. 15 | - 153 is made of a relatively thin, somewhat flexible material.

: In addition, the couplings 15γ - 153 are pivotally attached at their upstream end to the turbulence generator or manifold 13 so that the couplings 151 - 153 can be freely positioned and bent, which means that at least the pressures prevailing in the 8 112813 overlapping flow channels to level off. The outputs 15 j to 15 ^ have planar portions delimiting overlapping flow channels. In the machine direction vertical cross-section, the holes 15 ^ 153 are preferably slightly wedge-shaped tapering in the flow direction and have a rounded end edge 15c. The length Lj of the hetulates 15 ^ - 153 is dimensioned to be substantially equal to or slightly smaller than the length Lq of the lip channel 14 in the machine direction and in the flow direction. In some exceptional cases, the holes 15 may also extend beyond the lip opening 16 into the region of the forming crystal. The meshes 15j to 15 ^ jj are plate-shaped and extend over the entire width of the lip channel 14 so that there is a small clearance between the inner surfaces of the lip channel vertical side walls 10 and the machine direction edges of the lip channels so that the sutures can freely position and bend in the lip channel 14 due to their articulation 15a and / or flexibility. The hetula arrangement can also differ substantially from those shown in Figures 1 and 2 only schematically and by way of example. The hetero structure may be, for example, comprising two long hetulas extending up to 15 outside the lip opening 16 and having three short spacers at the beginning of the subchannels delimited by them, for example about 5 to 30%, preferably 10 to 15% of the total machine direction length of the long hetulas.

In the following, the multiplier control applied in the invention will be described at a general level, and this description is valid in the various application examples of the invention shown in Figs. 3, 4 and 5, in which the measured values MV and the corresponding setpoints SV change to different applications. Likewise, the model 40 used in the adjustment is formed of these; between large. The control system shown in Figures 3, 4 and 5 comprises a multivariate controller 30, into which the measurement or actual values MV are input from the headbox 10 and from which the control values CV controlling the actuators 20 are output. The multivariate controller 30 is controlled and modified by signals PM from the multivariate process model unit 40. The multivariate controller 30 v: is assigned setpoints SV from the setpoint unit 50.

: ': The multivariate process model 40 consists of elements Ry, each of which describes the the effect of the controllable,,: 30 large CV, e.g. the speed of the feed pump 20 j in question. to the measurable ..: quantity to which the desired setpoints SV are given from the unit 50. The effects of describing the elements of the element have taken into account both the strength of the effect, i.e. the gain, and the time dependence of the effect, i.e. time constants and delays.

The control system applied in the invention can be described in part by the following equation 5 (1).

y] Gn Gn ... r ^ - Y2 = G21 u2 (1) r3]; k where Gn Gn ...

R .. = G2i (2) 10

The model matrix Ry of equation (2) is a matrix of size (1 x k), the line i of which tells the effect of different controllable quantities Uj (j = 1 ... k) on the measurand Yj (i = 1 ... 1).

The elements of model 40 Ry can be so-called. step responses, impulse responses, transfer functions or so-called In the case of 15 state control, the coefficients of a group of differential or differens equations describing the system in question, assembled into a matrix. The shape of the model 40 is determined by the multivariate technique used, e.g. when applying model predictive control, the elements Ry are typically either step or impulse responses.

,: 20 The values of Ry of the elements of model 40 can be determined experimentally, e.g. by means of step response experiments "'. Or if there is sufficient physical information about the process, the model can be formed and.' The model 40 can also be arranged to be adapted so that data on the process are collected in the model 40 for a sufficiently long period of time, e.g.

10 112813 in connection with a change of species or other similar change. In this case, it is possible to proceed, for example, by leaving certain parameters in the model 40 as variables, which are specified to better describe the process as data is collected from the process. In addition to on-line measurements, process model 40 can also be refined with measurement results available from 5 laboratories, which are entered into model 40.

There may be several models 40 so that each model is used only in a limited operating range. When the operating point moves sufficiently from the operating point where the model is defined, model 40 describing the new operating point or new model parameters is introduced.

10

In the control system according to the invention, the following quantities are measured, for example: speeds of the feed pumps 201 ... 20 ^, controls Sj ... S3 of the feed pumps 20 (coarse control and fine control), pressure difference across the machine screens, mass flow rates F | ... F ^ j in different approach lines after sieves, pressures of equalization chambers (not shown), average pressure Pt at the hetero section 15 j ... 15 ^ _ι in the central channel of the lip channel 14 and the size A of the lip opening 16.

In the control system according to Figure 3, the control is based on separate controls of the average pressure Pt and the flow ratios F3 / Ft and Fj / Ft (Ft = Fj + F2 + F3). According to the jet ratio 1 20 (velocity of the lip jet J / speed of the wires) and the geometry of the lip channel 14, a set value is calculated for the average pressure Pt of the headbox 10 (pressure measurement 24 in the middle layer of the lip channel 14) between the set value of the average pressure Pt and the measurement difference. calculate the control variable CV, of the average pressure regulator Pt,: which is the bottom control for all feed pumps 20 j, 2Ο2 and 2Ο3.

25 The user can set the flow ratio setpoints between the different channels of the lip channel 14 to 50. The flow ratios are given for the flow rates Fj and F3 of the outermost channels 14a to 15j and 14b to 152 and the remainder remains for the middle channel 15j to 152-: From the flow ratio setpoint to the calculated flow rate : 30 flow ratio controller control quantities CV. These control variables CV are added to the bottom control calculated by the average pressure Pt regulator. The flow ratio control also corrects for changes in the flow ratio due to the change in operating point due to changing pressure losses in the different lines, because the structure of the lines is not completely identical. Em. flow ratios have strong cross-effects, i.e. when changing one flow ratio, all volume flows must change and this interferes with another adjustable flow ratio. Similarly, changes in flow ratios also momentarily affect the control of the average pressure Pt because the total flow changes. These cross-effects can be overcome by using feedbacks and / or the multivariate control described above. From the automation system, control is transferred in two parts to the motor drives to improve accuracy. The so-called coarse steering and fine steering. 10 Fine control is the deviation of the control signal from the coarse control. In this case, the control information can be accurately transferred to the motor drives with a reasonable A / D conversion resolution.

In the general application example corresponding to Fig. 3, the average pressure Pt of the headbox is set and the total flow Ft = Fj + F2 + F3 + ... Fj ^ and the flow-15 ratios Fj / Fj ... fN- j / Ft are adjusted. Thus, there are one less flow ratio (i.e., N-1) than the flows. The size of the matrix of the process model 40 is then 3 x N.

The application example shown in Fig. 4 differs from that shown in Fig. 3 in that in addition to measuring the average headbox pressure Pt, the flow rates Fj, F2 and F3 are measured and transferred as measured values MV to the variable variable controller 30. The setpoint unit 50 is given a setpoint for average pressure Pt and their different flow ratios. on the basis of which the setpoints sj, S2 and S3 of the feed pumps 20j, 2Ο2 and 2Ο3 are formed: for the pumps' own speed settings.

In the control system according to Fig. 5, in addition to the average pressure Pj of the headbox 10, the pressures Pj and P3 of the partial flows F1 and F2 are measured from the beginning of the lip part; with background sensors 26j and 263. The pressures P1 and P3 are measured, for example, at the intermediate chambers before the turbulence generator. The pressure signals obtained from said sensors 26j and 263 are transmitted via units 27j and 273 to the separators 28j and 283. In these separators 28j and 283, the pressures of the pressures and total pressures dPj = Pj - Pt and dP3 = P3 - Pt of the partial flows Fj and F2 are formed. , which are passed via units 29j and 293 12 112813 as measured values MV to the multivariate controller 30. Thus, the pressure differences dP are calculated one less than the measured pressures Pt, Pj and Pg. In practice, the pressure differences dP have to be measured in order to obtain sufficient measurement accuracy directly as differential pressure measurements. Thus, with respect to the measurement of pressure differences, Fig. 5 is to be understood as a schematic representation of only 5. In Figure 5, the size of the matrix Rjj of the multivariate model 40 is 3 x n, where n is the number of pressures to be measured.

Figure 6 shows in principle a block diagram of another preferred embodiment of the invention. According to Figure 6, the control object is divided into an active process 80 and a passive process 90. The passive process 80 includes e.g. the lip portion 14 of the headbox 10 described above, provided with hetero-rings 15j ... 15n_j. According to Fig. 6, the average velocity vt of the lip jet J discharged through the lip opening 16, the velocities v ^ of the different layer flows Fj ... Fj ^ in the subchannels and the total thickness ht of the pulp jet J discharged from the lip opening 16 and / or the thicknesses h ^ of the different layers are measured. Said quantities vt, v ^, h ^, ht form the measured values MV, which are fed to the difference element 61. To this difference element 61, the corresponding setpoints SV of the above-mentioned measured values vt, v ^, h ^, ht are also fed. The difference elements 61 provide difference signals which are applied to the first model controller 60. From this unit 60 the modeled setpoints SVm are obtained, which are applied to the second difference 71. Measured values 20 MVm are also applied to this difference 71, comprising the total flow Ft and the partial flows F j, F2 and F3 measured values. The difference values of said measured values MVm and setpoints SVm are formed in the second difference element 71 and fed to the second model controller unit 70. From this unit 70 control values CV are obtained comprising control signals Cj, C2 and C3 of the first, second and third mass pumps 20 controlling the active process 80 mass pumps 20 arranged, for example, in the same manner as the pumps 20 shown in Figures 3, 4 and 5.

. ; Within the scope of the inventive idea defined by the appended claims, the various details of the invention may vary and differ only from those exemplified above.

Claims (11)

A feedback system for a multilayer headbox (10) of a paper or board machine, the multilayer headbox (10) comprising N, N> 2, overlapping 5 pulp suspension flow channels extending separated from each other at least close to the lip channel (14) of the lip (14) of the multilayer headbox (10) from which a pulp suspension jet (J) consisting of partial mass flows (Fj ... Fn) discharges onto a forming wire or a forming coil between the forming wires, the control system comprising a control unit (30) and a setpoint unit (50) to which the control unit (30) is fed a headbox measured values (MV) from which the control unit (30) provides control values (CV) for controlling actuators (20i ... 20n) as headbox systems, characterized in that said measured values (MV) include the measured value of the average pressure (Pt) of the headbox lip channel (14) and headbox residues for the different sub-flow rates (F] ... Fn) of the approach lines or their the measured value (s) of the flow rates and / or the ratio or ratios of said measured values to the total mass flow (Ft) or its velocity and / or the corresponding measured values (MV), and that said average pressure (Pt) is measured from the headbox lip (14) 15i to 15n-i) from the point of the provided lip channel (14), which gives an indication of the average headbox pressure (Pt), that: the control unit (30) is a multivariate controller controlled by a multivariate process model (40) and that the multivariate process model is formed of elements (Rij) who each. describe the effect of control values (CV) on the corresponding measured values (MV). A control system according to claim 1, which comprises a rotary system according to claim 1, which comprises a hard drive (15) to 15 mm in the form of a hardener (15 j - 15 ^ _ | uppströms belägna ände är fästade vid inloppslädekonstruktioner fast eller 30 ledbart (15a) och / eller vilka Harder (15j - 15 ^ _ |) är av ett skivmaterial som kan böja sig ätminstone i nägon män. 17 112813 A control system according to claim 1, characterized in that the control system controls a headbox having in the lip part (14) N-1 pieces of plate-like hetero-rings (15i ... 15n-i) which can be freely positioned to a certain extent; which are fixedly or articulated (15a) to the headbox structures at their upstream end and / or which are at least to some extent flexible sheet material of the sheets (15i ... 15n-i). • I 30 14 112813 3. A preferred embodiment according to claim 1, which comprises a process model (40) according to which the variable matrix form and the model (s) of the model matrix (Ry) are inverted to an oil stack (Uj) from a styrene head (Yj) som mäts. 5 Control system according to Claim 1, characterized in that the multivariate process model (40) is in matrix form, so that each row (i) of the model matrix (Rjj) determines the effect of different controllable quantities (Uj) on the measurands (Y 1). 4. A control system according to claim 3, which comprises said element (Ry) in a process model (40) with different variables and coefficients in a group of differential or differentiated sequencer rectifiers, pulse correlates, inverter function systems, metered operation systems and matrix. 10 Control system according to claim 3, characterized in that said elements (Ry) of the multivariate process model (40) are step responses, impulse responses, transfer function parameters and / or coefficients of a differential or differential equation group describing the controllable system assembled into a matrix. Control system according to Claims 1 to 4, characterized in that the so-called control system is applied in the control system. feedback. 5. A control system according to claims 1 to 4, which can be used as a control method. 6. A control system according to claims 1-4, which comprises the following, in which the genomics tritket (Pt) is completed at the end of the inlet, the heat at the genome trit is measured at the end of the inlet, the total mass is + F2 ... Fjvj) i tillströmningslinjerna och förhällandena mellan nämnda strömningar (Fj .. .Fj ^ j) ocen den totala strömningen (Ft), vilka mätvärden förs account Regle-ringsenheten (30) som mätvärden (MV) och att frän regleringsen (30) There are 20 columns (CV) for a functional arrangement in an in-line system, warming up to a number of columns (s ^ ... s ^) for the mass matrix pump (20j ... 20 ^) (Fig. 3). .! 7. A control system according to claims 1-6, which comprises a genomic trace (Pt) in the inlet end, a heat and a measuring channel in the 25th flap (14), and in the case of a doping plant (Ft ...) ^) i de olika till- \ strömningslinjerna i inloppslädesystemet, vilka mätvärden (MV) förs account regleringsen heten (30) (figur. 4). Control system according to one of Claims 1 to 4, characterized in that the control system measures the mean pressure (Pt) of the lip of the headbox, preferably the mean pressure of the central channel of the lip, the total mass flow of the approach lines (Ft = Fi + F2 ... Fn) and the (F {... Fn-i) ratios for total flow (Ft), which measured values are transferred to the control unit (30) as measured values (MV) and that the control unit (30) gives the headbox system control values (CV) for actuators, preferably for mass feed pumps (20i ... 20n ) speed controls (s [... sn) 20 (Fig. 3). Control system according to one of Claims 1 to 6, characterized in that the control system measures the average headbox pressure (Pt), preferably from the central channel of the lip part (14), and also measures the partial mass flows (Fy ... Fn) of the different approach lines of the headbox system. which measured values (MV) are transferred to the control unit: (30) (Figure 4). : '; Control system according to one of Claims 1 to 7, characterized in that the control system measures the pressures (Pi ... Pn) of the various flow channels of the headbox lip (14), preferably: 30 152828 min, which are fed to the control unit (30) as measured values. (MV) (Figure 5). 8. Regulatorsystem enligt nägot av patentkraven 1-7, kännetecknat därav, att i regler- '30 systemet mäts trycken (Pj ... Pn) i de olika strömningskanalerna i läppdelen (14) av 112813 18 inloppslädan, warmpligast i en utjämningskammare, vilka rotten account regleringsenheten (30) som mätvärden (MV) (figur. 5). A control system according to claim 8, which comprises a rotary system (Pt) at the end of the measuring channel of the flap channel (14) and a tricycle (P ^ Pg) at the end of the flow of the channel, the heating strip, form of trick differentiation, and different (dPj, dP2) of said tryck (Pt; Pj, Pg) for each value (MV) account for the control (30) (Figure 5). Control system according to Claim 8, characterized in that the control system measures the average pressure (Pt) from the outlet side of the central channel of the lip channel (14) and the pressures (Pi, P3) of other channels, at least the edge channels, preferably from the inlet side, preferably directly by differential pressure measurements. the differences (dPi, (IP2)) of said pressures (Pt; Pi, P3) are transferred as measured values (MV) to the control unit (30) (Fig. 5). 10. A control system according to claims 1-5, which is intended to include, in particular, a control system according to the genome name (see) of the flap (J), a skylight (v) of a dextraction device (Fj, F2). . 15 Control system according to one of Claims 1 to 5, characterized in that the quantities measured in the control system include the average velocity (vt) of the lip jet (J), the layer velocities (vk) of the different partial flows (Fi, F2 ... Fn) and / or the total lip jet thickness ( ht) and / or the thicknesses of its different layers (hk). Control system according to one of Claims 1 to 10, characterized in that the values of the elements of the multivariate process model (40) are determined experimentally, e.g. by step-response tests, and / or the model is formed on the basis of physical data obtained from the process and / or the model is adapted to adapt to ) collects data. on the basis of on-line measurements and / or laboratory measurement results to refine 20 models. , 6 112813 1. Äterkopplat reglersystem för en flerskiktsinloppsläda (10) i en pappers- eller karton-maskin, vilken flerskiktsinloppsläda (10) omfattar N stycken, N> 2, ovanom varandra 5 belägna strömningskanaler för massasuspension, som sträcker the account is open from the end of the feed (16) to the end of the channel (14) to the end of the feed (10), the genome of the mass suspension (J), to the best of the damping (Fj .. -F ^), or in the form of a power supply, the control system is equipped with a control unit (30) and a stock-10 control unit (50), an account of the control unit (30), the LED control unit (MV), and the control capacity of the control unit (30) (CV), with a range of functional functions (20 ^ ... 20 ^) in the in-line system, in turn, in which account is used for the genomic tricket (Pt) in the in-channel channel (14) of the in-line channel (14) ett eller in the case of the head oil was delmassaström-15 ningarna (Fj. (MV), och att nämnda genomsnittliga tryck (Pt) ätt pä sädant ställe av den med Harder (15 j - 15 ^ j) försedda lapppkanalen (14) i läppdelen (14) av inloppslä-20 dan där det erhälls en indicating the genome-specific tricket (Pt) in the control mode (30) is a regulator with variable variables in the process model (40) with variable variables and process models with variable variables in the element (Ry) that the inverse of the cross-sectional area (CV) has been measured (MV). 25 11. A control system according to claims 1 to 10, comprising a set of elements in a process model (40) with a variety of experimentally improved exemptions from a set of correlation models and / or model images on the basis of physical data data from the process. if the model has an output method of 20 samples, the account is based on the model (40) on the basis of the process on the basis of on-line measurement and / or laboratory results, with a precision of the model. t