DE102010038891A1 - Headbox for machine to manufacture e.g. packaging paper web from fibrous material suspension, has partial flow lines arranged adjacent to secondary feed device and arranged non-adjacent to intermediate channel and/or fluid metering units - Google Patents

Abstract

The headbox (1) has a primary feed device (4) for supplying a fibrous material suspension (2) and comprising a transverse distribution pipe (5). A nozzle (20) connected to a turbulence-generating unit (17) comprises a nozzle orifice (21). Partial flow lines (23) are arranged adjacent to a secondary feed device (11) and arranged non-adjacent to an intermediate channel (8) and/or fluid metering units (9, 9.1). A distribution pipe perforated plate (6) comprises a set of flow channels (7) that is arranged in lines (Z) and in gaps (S).

Description

The invention relates to a headbox for a machine for producing a fibrous web, in particular a paper, board or packaging paper web, from at least one pulp suspension, with a primary feeding device which feeds the at least one pulp suspension and preferably comprises a transverse dividing pipe, with a downstream and downstream one a plurality of arranged in rows and in columns flow channels distribution tube plate having a downstream thereto, extending over the width of the headbox intermediate channel with a plurality of spaced apart in the width direction of the headbox means for preferably controllable / metered addition of a fluid in partial fluid streams in the at least one pulp suspension, wherein the supply of the fluid into the means preferably takes place indirectly by means of a secondary feed device, preferably designed as a transverse distributor tube, with a downstream turbulence generating means having a plurality of flow channels arranged in rows and in columns and having a headbox jet immediately adjacent to the turbulence generating means and having a nozzle gap.

Such a headbox is for example from the publications DE 44 16 898 A1 . DE 44 16 899 A1 and DE 44 16 909 A1 known.

In this, a preferably machine-width intermediate headbox having headbox from a known to the expert Konstantteil fibrous suspension is passed through the transverse distribution tube, then deflected before or in the Verteilrohrlochplatte in the machine direction (MD), isolated and fed to the preferably machine-width intermediate channel. During the guidance of the pulp suspension through the preferably machine-wide intermediate channel, fluid fed / controlled is metered in by means of a line, in particular a transverse dividing tube. In the subsequent turbulence generating means, the flow is uniformed and the entire suspension is fluidized. For "cross-flow-free" filling of the downstream headbox nozzle, a very good throughput constancy must be achieved by the turbulence generation means in the cross machine direction (CD). In the headbox, the suspension is finally accelerated to machine speed.

In the case of the known headbox, moreover, the at least one transverse distributor tube is designed for a uniform amount of pulp suspension or fluid in the cross machine direction.

A disadvantage of such a headbox is that its corresponding transverse distribution tube for the pulp suspension or the fluid is provided with a return system for the excess portion (cf., for example 4a the publication DE 198 43 729 A1 ). This feedback system usually has a return line and a flow control, comprising a control unit including at least one sensor (pressure sensor), at least one actuator (spool) and various lines on. Such a return system causes incalculable costs in both purchase, operation and maintenance, and it is also sluggish in function and prone to repairs.

Furthermore, from the document DE 102 08 610 A1 already known a headbox whose single transverse distribution tube has a tapered in the flow direction of the pulp suspension cross section and is connected only in the region of its largest cross section to a supply line for the pulp suspension. The pulp suspension fed to the transverse distribution tube is discharged exclusively via the headbox nozzle. Although the disadvantageous recycling system for excess pulp suspension can be avoided with such a headbox, the technical implementation of such a headbox is more than difficult. In particular, this in turn can be a high energy consumption.

And from the publication DE 94 21 889 U1 is a headbox with a device for blockage-free throttling a fluid suspension flow in the design of a valve known. The 3 This document shows the use of two valves on the example of the controlled supply of dilution water in the main flow of a stock suspension in a headbox. Two transverse distributors are shown, wherein the stock suspension is supplied from the first transverse distributor in an increased concentration via a main line to the headbox. On the main line at an angle not equal to 90 °, a supply of dilution water is shown in the main stream. The supply of dilution water consists essentially of the valve itself, wherein the valve is connected by a supply line directly to the second transverse distributor, which leads the dilution water.

In a known headbox with a so-called dilution water control, ie with a preferably controllable / metered addition of a fluid in partial fluid streams in the pulp suspension by means in the width direction of the headbox spaced apart means now exists in an operation without recirculation, the problem of occurring trend adjustments the means for preferably controllable metered addition of the fluid in partial fluid streams in the pulp suspension.

Thus, for the purpose of shrinkage compensation, ie the compensation of transverse shrinkage in the dryer section of the machine for producing the fibrous web, the means at the two edges of the machine are all set in the same direction, that is to say open. And for the purpose of a Randabströmkompensation, so the compensation of the cross-flow of the pulp suspension on a wire of the machine for producing the fibrous web, the means must all be closed at the edge. As a result, the flow velocity of the fluid in the transverse distribution tube is greatly increased in one case or greatly reduced in the other case. This effect becomes more pronounced the lower the amount of recirculation in the transverse distribution tube, in a case without recirculation this effect is maximal. Also, at increased flow velocities of the fluid, a reduction of the correction potential of the means may arise, for example, caused by a pressure drop, or at too low flow velocities of the fluid contaminants in the transverse distribution tube.

It is therefore an object of the invention to improve a headbox of the type mentioned in such a way that the aforementioned disadvantages of the prior art as far as possible, preferably completely eliminated. In this case, the pressure loss should be as low as possible and optimally distributed to preferably uniform distribution of the fluid as possible. Also, the energy consumption and investment costs of the headbox should be significantly reduced and the consumption of chemicals, especially retention agents are reduced.

This object is achieved in a headbox of the type mentioned in the present invention, that between the secondary feeder and the intermediate channel or the means for preferably adjustable / controllable metering of a fluid in fluid streams in the at least one pulp suspension a plurality of leading through partial fluid streams Partial flow lines are provided, that the partial flow lines each have a means for controlling / controlling the partial fluid flow and that the partial flow lines, which are arranged adjacent to the secondary supply device, at the intermediate channel or the means for preferably controllable metered addition of a fluid in Partial fluid streams are arranged in the at least one pulp suspension not adjacent.

The object of the invention is completely solved in this way. The inventive design of the headbox of the type mentioned provides a most extensive, preferably complete avoidance of the aforementioned disadvantages of the prior art and a significantly improved fulfillment of particular technological requirements.

In the headbox according to the invention, the fluid coming from the constant part is separated by the secondary transverse distribution tube and both the means for controlling / controlling the partial fluid flow and the partial flow lines the intermediate channel or the means for preferably controllable metered addition of a fluid in partial fluid streams fed into the at least one pulp suspension for metering. In this case, a flow velocity which is as constant as possible in the transverse direction of the machine should be generated in the secondary transverse distribution tube. The solution to this is that the partial flow lines are arranged "crosswise", so generally crossing each other. This means that edge-side areas of the head box according to the invention are supplied by partial flow lines, which are opposite to the inlet flow in the secondary transverse distribution tube attached, and that middle portions of the head box according to the invention are supplied by partial flow lines, which are attached to the end of the secondary transverse distribution tube. This moves the critical areas at the edge into a noncritical one in the middle of the machine. Here, the effects of the above-mentioned trend adjustments of the means for preferably controllable metered addition of the fluid in partial fluid streams into the pulp suspension are significantly less pronounced.

The fluid supplied to the secondary supply device is preferably fed exclusively to the means for preferably controllable metered addition of a fluid in partial fluid streams into the at least one pulp suspension. Thus, the dilution system of the head box according to the invention can be realized without recirculation of the fluid and the amount of fluid in the two edge regions of the head box according to the invention varies to a significant extent less.

Also, the partial flow lines, which are arranged adjacent to the secondary supply device, preferably arranged with a system at the intermediate channel or the means for preferably controllable metered addition of a fluid in partial fluid streams in the at least one pulp suspension. The type of crossing already ensures without much effort that a high degree of homogenization in the fluid supply of the head box according to the invention is achieved. The partial flow lines are preferably arranged with a system, such as in sections, in groups or the like, whereby the effort is reduced again and in all Sub-power lines approximately the same operating conditions prevail.

In order to achieve approximately the same operating conditions, such as pressure losses, flow velocities and the like, and also to ensure process reliability, the partial flow lines are preferably designed to be flexible and similar and preferably have the same or approximately equal line lengths.

Furthermore, the secondary supply device is preferably designed as a transverse distribution tube, wherein the partial flow lines are preferably arranged along a straight line on the transverse distribution tube having a longitudinal axis. As a result, many structurally and procedurally meaningful design options, such as covers, hose penetrations, equal length hose guides and the like, arise. Also, the partial flow lines are preferably arranged perpendicular to the longitudinal axis of the transverse distribution tube and / or at an outlet angle, which assumes different values along the longitudinal axis of the transverse distribution tube, at the transverse distribution tube.

Moreover, it is in view of a cost and time-saving production advantageous if the partial flow lines are arranged at equal intervals on the secondary supply device, in particular the transverse distribution pipe.

Furthermore, the secondary feed device designed as a transverse distributor tube preferably has a cross section tapering in the flow direction of the fluid, and the secondary feed device designed as a transverse distributor tube is preferably connected in the region of its largest cross section to a feed line for the fluid. The cross-section of the transverse distribution tube tapering in the flow direction of the fluid and the connection of the supply line for the pulp suspension in the region of the largest cross section of the transverse distribution tube effectively ensure that the fluid flows under approximately the same conditions, in particular pressures, the intermediate channel or the means for preferably regularizing. / controllable metering is fed by a fluid in partial fluid streams in the at least one pulp suspension.

The transverse distribution pipe of the head box according to the invention preferably has at least one removable component in the region of its preferably smallest end-side cross section, the removable component preferably having a rectangular cross section. This removable component greatly improves the ease of maintenance and cleaning of the headbox. Due to the preferably rectangular cross section, the hydraulic height of the component is maintained. As a result, the reduction of the cross section is only uniaxial. In principle, the removable component can have all conceivable and useful cross-sectional shapes.

Also, the component is preferably designed as a flap part and connected by means of at least one hinge connection and associated attachment to the transverse distribution tube. The articulation is upstream, downstream or side mounted. Such a hinge connection belongs to the well-known state of the art and has already proven itself in many diverse applications. However, the component can of course also be connected to the transverse distribution tube by means of a multiplicity of screw connections or by means of a multiplicity of sliding connections.

The component is designed according to a further aspect of the invention as a cleaning access for the distributor and / or as a sampling point for pulp suspension. These embodiments are characterized in particular by a practical benefit; So they are beneficial in many ways.

Furthermore, in the region of its preferably smallest end-side cross section, the transverse distribution tube preferably has a foldable and displaceable end module which can be changed in its cross section. This displaceable end model allows a fast, cost-effective and technically simple adaptation of the transverse distribution pipe to changed operating conditions in the region of the headbox, for example changed pressures or flow rates.

With a view to the simplest possible construction, preference is given to providing flange surfaces, which are aligned at an angle to the flow direction of the fluid, between the transverse distributor tube and the end module. In this way, an additional influence on the flow velocity in the transverse distribution tube can be taken by displacing the end module by a certain distance.

In a preferred alternative embodiment, the secondary feed device designed as a transverse distributor tube is mirror-inverted or approximately mirror-inverted, the transverse distributor tube is connected in its initial and end regions to a respective supply line for the fluid and the transverse distributor tube has a cross-section which tapers in the flow direction of the respective fluid on. As a result, the "critical" areas are at the edge in the middle of the machine, ie in a non-critical area.

The respective means for preferably regulatable / controllable metering of the fluid in partial fluid streams into the at least one pulp suspension can be a metering blade, as also described in the document WO 2010/069649 A1 disclosed. The relevant disclosure content is hereby made the subject of the present description.

And the means for controlling the partial fluid flow may comprise a valve known to those skilled in the art.

Moreover, the fluid can consist of water, in particular white water or clear water, or of at least one pulp suspension whose concentration differs from the average concentration of the at least one pulp suspension flowing in the headbox. These types of fluids have already proven themselves in similar applications.

The headbox according to the invention is outstandingly suitable for use in a machine for producing a fibrous web, in particular paper, cardboard or packaging paper web. The fibrous web produced in the machine with at least one headbox according to the invention has consistently excellent properties, since, among other things, the control of both its fiber orientation transverse profile and its basis weight cross-section is possible.

Further features and advantages of the invention will become apparent from the following description of several preferred embodiments with reference to the drawings.

Show it

1 a vertical and schematic longitudinal sectional view of a preferred embodiment of a headbox according to the invention for a machine for producing a fibrous web of at least one pulp suspension;

2 a schematic Quererverteilrohr exhaust pattern for the fluid in the cross-machine direction in a known headbox in the ideal operating range;

3 a schematic Quererverteilrohr exhaust pattern for the fluid in the cross-machine direction in a known headbox in the practical operating range;

4 shows an exemplary and preferred arrangement scheme for the partial flow lines in a headbox according to the invention;

5 a preferred embodiment of a trained as transverse distribution tube secondary feeder of a head box according to the invention;

6 a schematic perspective partial view of another preferred embodiment of a secondary distribution device designed as a transverse distribution tube of a headbox according to the invention;

7 a schematic plan view of the in the 6 illustrated schematic perspective view of the further preferred embodiment of the transverse distribution formed as a secondary feed device of the head box according to the invention;

8th a schematic front view of another preferred embodiment of a transverse distribution formed as a secondary feeder of a head box according to the invention; and

9 a schematic side view of the in the 8th illustrated schematic front view of the further preferred embodiment of the transverse distribution formed as a secondary feed device of the head box according to the invention.

The respectively in the 1 to 9 illustrated headbox 1 is particularly suitable for use in a machine for producing a fibrous web, in particular a paper, cardboard or packaging paper web, from at least one pulp suspension.

The 1 shows a vertical and schematic longitudinal sectional view of a headbox 1 for a machine for producing a fibrous web 3 from a pulp suspension 2 (Arrow). The illustrated headbox 1 can of course also be designed as a multi-layer casserole, the at least two different pulp suspensions for the production of the fibrous web 3 used. The fibrous web 3 may be in particular a paper, cardboard or packaging paper web.

The headbox 1 has a one pulp suspension 2 (Arrow) feeding primary feeder 4 in a refinement of a transverse distribution tube known to the person skilled in the art 5 on.

The feeder 4 closes downstream of a distribution well plate 6 on, a plurality of arranged in rows Z and in columns S flow channels 7 having.

Again downstream of the distribution well plate 6 joins in across the width B (arrow) of the headbox 1 extending intermediate channel 8th on, with several widthwise BR (arrow) of the headbox 1 spaced resources 9 for preferably controllable metered addition of a fluid 10 (Arrow) in partial fluid streams 10.T (Arrows) in the pulp suspension 2 (Arrow) is provided.

The respective means 9 for preferably controllable metered addition of the fluid 10 (Arrow) in partial fluid streams 10.T (Arrow) in the pulp suspension 2 (Arrow) preferably comprises an injector 9.1 ,

The supply of the fluid 10 (Arrow) in the middle 9 . 9.1 preferably takes place indirectly by means of a transverse distribution pipe 12 trained secondary feeder 11 ,

The single agent 9 . 9.1 For preferably controllable / metered metering, several each comprise a respective metering channel opening 13.o exhibiting, opening at different heights and with a common supply channel 15 connected metering channels 14 , The regulation / control of the metered amount of fluid 10 (Arrow) takes place by means of a valve 16 ,

The intermediate channel 8th Downstream is a turbulence generating means 17 with a plurality of flow channels arranged in rows Z and in columns S. 18 , During operation of the headbox 1 becomes the pulp suspension 2 (Arrow) in the turbulence generating means 17 divided into pulp suspension sub-streams and after exiting the turbulence generating means in a machine-wide chamber 19 in an embodiment of a nozzle gap 21 having headbox nozzle 20 reunited to form a machine-wide fibrous web 3 to enable. The flow channels 18 are formed in a known manner preferably as thin-walled turbulence tubes and / or turbulence tube inserts with at least partially constant, at least partially diverging, at least partially converging and / or discontinuous cross-sectional areas.

Also, in the headbox 20 at least one, the expert well-known and not explicitly shown separating element, in particular a blade be arranged. Should several separating elements, in particular slats in the headbox nozzle 20 may be arranged, they may have different lengths and possibly also different properties, such as surface contours and the like.

The headbox 20 can on the outlet side at least one side with a dashed line indicated aperture 22 be provided.

According to the illustrated preferred embodiment of the head box according to the invention 1 are between the secondary feeder 11 the means 9 . 9.1 for preferably controllable metered addition of a fluid 10 (Arrow) in partial fluid streams 10.T (Arrow) in the at least one pulp suspension 2 (Arrow) a variety of fluid partial flows 10.T (Arrow) leading partial flow lines 23 intended. The partial flow lines 23 each have a mean 24 for controlling / controlling the partial fluid flow 10.T (Arrow). The respective means 24 for controlling / controlling the partial fluid flow 10.T (Arrow) is for example a known valve 24.1 , Moreover, the partial flow lines 23 attached to the secondary feeder 11 , so the transverse distribution pipe 12 , are arranged adjacent to the means 9 . 9.1 for preferably controllable metered addition of a fluid 10 (Arrow) in partial fluid streams 10.T (Arrow) in the pulp suspension 2 (Arrow) not adjacent (see. 4 ).

The from the secondary feeder 11 outgoing partial flow lines 23 can also go directly into the intermediate channel 8th the headbox according to the invention 1 lead. In this embodiment, then no means 9 . 9.1 for preferably controllable metered addition of a fluid 10 (Arrow) in partial fluid streams 10.T (Arrow) in the pulp suspension 2 used.

The partial flow lines 23 are flexible and similar and preferably have the same or approximately the same cable lengths 23.L (Double arrow). Also, the partial flow lines 23 along a straight line 12.G on which a longitudinal axis 12.L having transverse distribution pipe 12 arranged.

The 2 shows a schematic Quererverteilrohr-discharge scheme for the fluid 10 (Arrow) in the cross machine direction CD (double arrow) in a known headbox 1 for a machine for producing a fibrous web from at least one pulp suspension at the ideal operating point.

It can be seen that in a known headbox 1 the secondary feeder 11 , so the transverse distribution pipe 12 for a uniform withdrawal amount of fluid 10 (Arrow) in partial fluid streams 10.T (Arrow) in the cross machine direction CD (double arrow) is designed. This results in an operation of the headbox 1 in the field of its design a constant speed 10.V in and a constant deduction amount 10.Q from the transverse distribution pipe 12 ,

The 3 shows a schematic Quererverteilrohr-discharge scheme for the fluid 10 (Arrow) in Cross machine direction CD (double arrow) in a known headbox 1 for a machine for producing a fibrous web from at least one pulp suspension in the practical operating range.

Thus, for the purpose of shrinkage compensation, ie the compensation of transverse shrinkage in the dryer section of the machine for producing the fibrous web, the means 24 . 24.1 for controlling / controlling the partial fluid flow 10.T (Arrow) at the two edges of the machine all in the same direction, so set to open (extended arrow lengths).

As with a well-known headbox 1 the secondary feeder 11 , so the transverse distribution pipe 12 for a uniform withdrawal amount of fluid 10 (Arrow) in partial fluid streams 10.T (Arrow) is designed in the cross machine direction CD (double arrow), results in an operation of the headbox 1 in the practical area a wavy speed 10.V in and a bathtub-like withdrawal amount 10.Q from the transverse distribution pipe 12 ,

The 4 shows an exemplary and preferred layout scheme for the partial flow lines 23 in a headbox according to the invention 1 ,

The partial flow lines 23 attached to the secondary feeder 11 , so the transverse distribution pipe 12 , are located adjacent to the means 9 . 9.1 for preferably controllable metered addition of a fluid 10 (Arrow) in partial fluid streams 10.T (Arrow) in the pulp suspension 2 (Arrow) not adjacent.

The partial flow lines 23 are arranged with a system, such as in sections, in groups or the like. In the present embodiment, the system comprises three groups G1 to G3, each having six partial flow lines 23 in the opposite direction between the transverse distribution pipe 12 and the means 9 . 9.1 for preferably controllable metered addition of a fluid 10 (Arrow) in partial fluid streams 10.T (Arrow) in the pulp suspension 2 (Arrow) are arranged (see. 1 )

It can also be clearly seen that that of the secondary feeder 11 supplied fluid 10 excluding the funds 9 . 9.1 for preferably controllable metered addition of a fluid 10 (Arrow) in partial fluid streams 10.T (Peil) is fed into the pulp suspension. So it is not a return system for the fluid 10 (Arrow) provided.

Furthermore, the partial flow lines 23 at equal intervals 23.A and perpendicular to the longitudinal axis 12.L of the transverse distribution pipe 12 at the transverse distribution pipe 12 arranged. Of course, they can also be arranged at an outlet angle, which preferably assumes different values along the longitudinal axis of the transverse distribution tube, on the transverse distribution tube.

The as cross distribution pipe 12 trained secondary feeder 11 points, one in the flow direction R (arrow) of the fluid 10 tapered cross-section 12.Q up and she's in the area of her biggest cross section 12.Qmax to a supply line 25 (Arrow) for the fluid 10 (Arrow) connected.

This embodiment of the headbox according to the invention 1 results in the practical range a quasi-constant, possibly slightly increased in the middle speed 10.V in and a bathtub-like withdrawal amount 10.Q from the transverse distribution pipe 12 ,

The 5 shows a further preferred embodiment of a transverse distribution pipe 12 trained secondary feeder 11 a headbox according to the invention 1 for a machine for producing a fibrous web from at least one pulp suspension.

In this embodiment, as the transverse distribution tube 12 trained secondary feeder 11 mirror image or approximately mirror image executed and the transverse distribution tube 12 is here in its initial and final area 12.A . 12.e to one supply line 25.A . 25.e (Arrow) for the fluid 10 (Arrow) connected. The respective supply line 25.A . 25.e (Arrow) preferably originates from a common main supply line 26 (Arrow). The transverse distribution pipe 12 again has a flow direction R (arrow) of the respective fluid 10 tapered cross-section 12.Q on.

This embodiment of the headbox according to the invention 1 results in a practical range, a quasi-constant, possibly centrally slightly reduced speed 10.V in and a bathtub-like withdrawal amount 10.Q from the transverse distribution pipe 12 ,

The 6 shows a schematic perspective partial view of another preferred embodiment of a transverse distribution tube 12 trained secondary feeder 11 a headbox according to the invention 1 for a machine for producing a fibrous web from at least one pulp suspension.

The transverse distribution pipe 12 has in the region of its preferably smallest end-side cross section 12.Qmin a hinged and movable end module 27 on that in its cross section 27.Q is changeable. For this purpose are between the transverse distribution pipe 12 and the end module 27 flange 28 provided at an angle W (see. 7 ) to the flow direction R (arrow) of the fluid 10 (Arrow) are aligned. Thus, by moving of the end module 27 in addition to the way s an influence on the flow velocity 10.V (Arrow) in the transverse distribution pipe 12 be taken.

And the 7 shows a schematic plan view of the in the 6 illustrated schematic perspective view of the further preferred embodiment of the transverse distribution tube 12 trained secondary feeder 11 the headbox according to the invention 1 for a machine for producing a fibrous web from at least one pulp suspension.

The hinged and movable end module 27 is in its cross section 27.Q variable. For this purpose are between the transverse distribution pipe 12 and the end module 27 flange 28 provided at an angle W to the flow direction R (arrow) of the fluid 10 (Arrow) are aligned. Thus, by moving the end module 27 in addition to the way s an influence on the flow velocity 10.V (Arrow) in the transverse distribution pipe 12 be taken.

The 8th shows a schematic front view of another preferred embodiment of a transverse distribution pipe 12 trained secondary feeder 11 a headbox according to the invention 1 ,

The transverse distribution pipe 12 has in the region of its preferably smallest end-side cross section 12.Qmin at least one removable component 29 on, which preferably has a rectangular cross-section 29.QR has. The acceptable component 29 is as a folding part 29.1 formed, which by means of at least one hinge connection 30 (Dot-dash line) and associated attachment with the transverse distribution tube 12 connected is. The articulation 30 is in the execution according to the 8th mounted upstream; However, it can also be mounted downstream or laterally in a further embodiment. Alternatively or additionally, the removable component 29 , in construction not shown, also be connected by means of a plurality of screw or by means of a plurality of slide connections with the transverse distribution tube.

And ultimately that shows 9 a schematic side view of the in the 8th illustrated schematic front view of the further preferred embodiment of the transverse distribution tube 12 trained secondary feeder 11 the headbox according to the invention 1 ,

The transverse distribution pipe 12 has a flow direction R (arrow) of the fluid 10 (Fluid) tapered cross-section 12.Q up and it's in the area of its largest cross section 12.Qmax to a merely indicated supply 25 (Arrow) for the fluid 10 (Fluid) connected.

The cross distribution pipe 11 supplied fluid 10 (Arrow) is exclusively the downstream downstream flow channels 7 the distribution pipe hole plate 6 fed.

Further, the transverse distribution pipe 12 with a closed and opened component 29 or folding part 29.1 , which by means of the hinge connection 30 and associated attachment with the transverse distribution tube 12 is connected shown. The component 29 or folding part 29.1 is preferably designed as a cleaning access and / or as a sampling point.

Generally this is in the 1 to 9 cited fluid 10 preferably from water, in particular white water or clear water, or from at least one pulp suspension whose concentration differs from the average concentration of the at least one pulp suspension flowing in the headbox.

• – WO 2010/069651 A1 ;
• – WO 2010/069652 A1 ;
• – WO 2010/069653 A1 ;
• – WO 2010/069650 A1 ;
• – WO 2010/069649 A1 ;
• – WO 2010/069648 A1 ;
• – DE 10 2009 027 013.2 vom 18.06.2009;
• – DE 10 2009 027 721.8 vom 15.07.2009; und
• – DE 10 2010 001 541.5 vom 03.02.2010.

With regard to the constructional and functional design of the means 9 . 9.1 Reference is made to the following six PCT publications and three German patent applications of the applicant, the disclosure contents of which are hereby made the subject of the present description:

• - WO 2010/069651 A1 ;
• - WO 2010/069652 A1 ;
• - WO 2010/069653 A1 ;
• - WO 2010/069650 A1 ;
• - WO 2010/069649 A1 ;
• - WO 2010/069648 A1 ;
• - DE 10 2009 027 013.2 from 18.06.2009;
• - DE 10 2009 027 721.8 from 15.07.2009; and
• - DE 10 2010 001 541.5 from 03.02.2010.

The in the 1 to 9 Headbox according to the invention, at least partially illustrated 1 is particularly suitable for use in a machine for producing a fibrous web 3 , in particular a paper, board or packaging paper web, from at least one pulp suspension 2 ,

In summary, it should be noted that a headbox of the type mentioned above is improved by the invention so that the aforementioned disadvantages of the prior art as far as possible, preferably completely eliminated. In this case, the pressure loss should be as low as possible and optimally distributed to preferably uniform distribution of the fluid as possible. Also, the energy consumption and investment costs of the headbox should be significantly reduced and consumption Chemicals, in particular retention agents are reduced.

LIST OF REFERENCE NUMBERS

1

headbox

2

Pulp suspension (arrow)

3

Fibrous web

4

Primary feeder

5

transverse distribution

6

distribution pipe

7

flow channel

8th

intermediate channel

9

Means for preferably controllable metered addition of a fluid in partial fluid streams in the pulp suspension

9.1

Injector or dosing sword

10

Fluid (arrow)

10.Q

deduction amount

10.V

speed

10.T

Fluid partial flow (arrow)

11

Secondary feeder

12

transverse distribution

12.G

Just

12.L

longitudinal axis

12.Q

cross-section

12.A

Start page area

12.e

End-side area

12.Qmax

Largest cross-section

12.Qmin

Smallest end-side cross-section

13.o

Zudosierkanalöffnung

14

Zudosierkanal

15

supply channel

16

Valve

17

Turbulence generator

18

flow channel

19

Machine width chamber

20

headbox

21

die gap

22

cover

23

Partial flow line

23.A

Distance cable length (double arrow)

24

Means for controlling / controlling the partial fluid flow

24.1

Valve

25

Feed line (arrow)

25.A

Start-side feed line (arrow)

25.e

End feed (arrow)

26

Main supply line (arrow)

27

end module

27.Q

cross-section

28

flange

29

Removable component

29.1

folding part

29.QR

Right-angled cross-section

30

Articulated connection (dashed line)

B

Width (arrow)

BR

Width direction (arrow)

CD

Cross machine direction (double arrow)

G1 to G3

group

R

Flow direction (arrow)

S

column

s

path

W

angle

Z

row

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 4416898 A1 [0002]
• DE 4416899 A1 [0002]
• DE 4416909 A1 [0002]
• DE 19843729 A1 [0005]
• DE 10208610 A1 [0006]
• DE 9421889 U1 [0007]
• WO 2010/069649 A1 [0026, 0081]
• WO 2010/069651 A1 [0081]
• WO 2010/069652 A1 [0081]
• WO 2010/069653 A1 [0081]
• WO 2010/069650 A1 [0081]
• WO 2010/069648 A1 [0081]
• DE 102009027013 [0081]
• DE 102009027721 [0081]
• DE 102010001541 [0081]

Claims (15)

Headbox ( 1 ) for a machine for producing a fibrous web ( 3 ), in particular a paper, board or packaging paper web, from at least one pulp suspension ( 2 ), with at least one pulp suspension ( 2 ) and preferably a transverse distribution tube ( 5 ) primary delivery device ( 4 ), with downstream and a plurality of flow channels arranged in rows (Z) and in columns (S) ( 7 ) distribution well plate ( 6 ), with a downstream thereto, across the width (B) of the headbox ( 1 ) extending intermediate channel ( 8th ) with several in the width direction of the headbox ( 1 ) spaced apart means ( 9 . 9.1 ) for the preferably controllable metered addition of a fluid ( 10 ) in partial fluid streams ( 10.T ) into the at least one pulp suspension ( 2 ), wherein the supply of the fluid ( 10 ) into the funds ( 9 . 9.1 ) preferably indirectly by means of a preferably as transverse distribution pipe ( 12 ) trained secondary feeder takes place ( 11 ), with a downstream turbulence generating means ( 17 ) with a multiplicity of flow channels arranged in rows (Z) and in columns (S) ( 18 ) and with a turbulence generating means ( 17 ) immediately adjacent and a nozzle gap ( 21 ) headbox ( 20 ), characterized in that between the secondary feeder ( 12 ) and the intermediate channel ( 8th ) or funds ( 9 . 9.1 ) for the preferably controllable metered addition of a fluid ( 10 ) in partial fluid streams ( 10.T ) into the at least one pulp suspension ( 2 ) a plurality of fluid partial flows ( 10.T ) leading partial flow lines ( 23 ) are provided that the partial flow lines ( 23 ) one agent each ( 24 . 24.1 ) for controlling / controlling the partial fluid flow ( 10.T ) and that the partial flow lines ( 23 ) attached to the secondary feeder ( 11 ) are arranged adjacent, at the intermediate channel ( 8th ) or funds ( 9 . 9.1 ) for the preferably controllable metered addition of a fluid ( 10 ) in partial fluid streams ( 10.T ) into the at least one pulp suspension ( 2 ) are not arranged adjacent. Headbox ( 1 ) according to claim 1, characterized in that that of the secondary feeder ( 11 ) supplied fluid ( 10 ) excluding funds ( 9 . 9.1 ) for the preferably controllable metered addition of a fluid ( 10 ) in partial fluid streams ( 10.T ) into the at least one pulp suspension ( 2 ) is supplied. Headbox ( 1 ) according to claim 1 or 2, characterized in that the partial flow lines ( 23 ) attached to the secondary feeder ( 11 ) are arranged adjacent, at the intermediate channel ( 8th ) or funds ( 9 . 9.1 ) for the preferably controllable metered addition of a fluid ( 10 ) in partial fluid streams ( 10.T ) into the at least one pulp suspension ( 2 ) are arranged with a system. Headbox ( 1 ) according to one of the preceding claims, characterized in that the partial flow lines ( 23 ) are designed to be flexible and similar, and preferably equal or approximately equal line lengths ( 23.L ) exhibit. Headbox ( 1 ) according to one of the preceding claims, characterized in that the secondary feeder device ( 11 ) as a transverse distribution tube ( 12 ) is formed and that the partial flow lines ( 23 ) along a straight line ( 12.G ) on which a longitudinal axis ( 12.L ) having transverse distribution pipe ( 12 ) are arranged. Distributor according to Claim 5, characterized in that the partial flow lines ( 23 ) perpendicular to the longitudinal axis ( 12.L ) of the transverse distribution pipe ( 12 ) and / or at an outlet angle, which preferably assumes different values along the longitudinal axis of the transverse distribution tube, at the transverse distribution tube (FIG. 12 ) are arranged. Headbox ( 1 ) according to one of the preceding claims, characterized in that the partial flow lines ( 23 ) at equal intervals ( 23.A ) on the secondary feeder ( 11 ), in particular the transverse distribution pipe ( 12 ) are arranged. Headbox ( 1 ) according to one of the preceding claims, characterized in that the transverse distribution pipe ( 12 ) formed secondary feeding device ( 11 ) in the flow direction (R) of the fluid ( 10 ) tapered cross-section ( 12.Q ) and that as transverse distributor pipe ( 12 ) formed secondary feeding device ( 11 ) in the region of its largest cross-section ( 12.Qmax ) to a supply line ( 25 ) for the fluid ( 10 ) connected. Headbox ( 1 ) according to claim 8, characterized in that the transverse distribution pipe ( 12 ) in the region of its preferably smallest end-side cross section ( 12.Qmin ) at least one removable component ( 29 . 29.1 ), wherein the removable component ( 29 . 29.1 ) preferably has a rectangular cross-section ( 29.QR ) owns. Headbox ( 1 ) according to claim 8 or 9, characterized in that the component ( 29 ) as a folding part ( 29.1 ) and by means of at least one articulated connection ( 30 ) and associated attachment with the transverse distribution tube ( 12 ) connected is. Headbox ( 1 ) according to claim 8, 9 or 10, characterized in that the component ( 29 . 29.1 ) is designed as a cleaning access and / or as a sampling point. Headbox ( 1 ) according to claim 8, characterized in that the transverse distribution pipe ( 12 ) in the region of its preferably smallest end-side cross section ( 12.Qmin ) a hinged and displaceable end module ( 27 ), which in its cross section ( 27.Q ) is changeable. Headbox ( 1 ) according to claim 12, characterized in that between the transverse distribution pipe ( 12 ) and the end module ( 27 ) Flange surfaces ( 28 ) are provided at an angle (W) to the flow direction (R) of the fluid ( 10 ) are aligned. Headbox ( 1 ) according to one of claims 1 to 7, characterized in that the transverse distribution pipe ( 12 ) formed secondary feeding device ( 11 ) is mirror-inverted or approximately mirror-inverted that the transverse distribution tube ( 12 ) in its initial and final area ( 12.A . 12.e ) to a respective supply line ( 25.A . 25.e ) for the fluid ( 10 ) and that the transverse distribution pipe ( 12 ) in the flow direction (R) of the respective fluid ( 10 ) tapered cross-section ( 12.Q ) having. Machine for producing a fibrous web ( 3 ), in particular a paper, board or packaging paper web, from at least one pulp suspension ( 2 ), characterized in that it comprises at least one headbox ( 1 ) according to one of the preceding claims.

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