DE102005000172A1 - Headbox of a machine for producing a fibrous web - Google Patents

Abstract

The invention relates to a headbox (1) of a machine for producing a fibrous web, in particular paper or cardboard web, from at least one fibrous suspension (2), with at least one feed device (3) feeding the at least one fibrous suspension (2) and with at least one turbulence-generating agent ( 5, 15), in which, during operation of the headbox (1), the at least one fiber suspension (2) by a plurality of preferably in rows (Z.1 to Z.4; ZA; ZA, ZB) and in columns (S.1 to S.11; SA; SA, SB) arranged flow channels (6; 6.1 to 6.44; 6.A; 6.A, 6.B) flows, thereby divided into turbulent fiber suspension partial flows (7; 7.1 to 7.44; 7.A) and after exiting the turbulence generating means (5, 15) is brought together again in a preferably machine-wide chamber (52), with means (9; 9.A; 9.A, 9.B) in the region of the turbulence generating means (5, 15) for metering in at least one fluid (10) in d he multitude of flow channels (6; 6.1 to 6.44; 6.A; 6.A, 6.B) are provided. DOLLAR A The headbox (1) according to the invention is characterized in that the means (9; 9.A; 9.A, 9.B) for metering at least one fluid (10) into the plurality of flow channels (6; 6.1 to 6.44 ; 6.A; 6.A, 6.B) are provided in the region of the turbulence generating means (5, 15) such that each flow channel (6; 6.1 to 6.44; 6.A; 6.A, 6.B) at least in sections of the at least one in the ...

Description

was standing of the technique

Such a headbox is for example from the German patent application DE 199 26 805 A1 known. This document moreover shows a metering tube designed as a means for metering a fluid into a stock suspension flow of a turbulence tube. For this purpose, the metering tube is provided with at least one lateral opening, which is associated with at least one opening in the turbulence tube.

at the realization of such a metering poses the disadvantage one that, inter alia, due to the hydraulically necessary arrangement the turbulence pipes and the metering pipes a mutual dimensional dependence consists. Enlarged For example, the diameter of the turbulence tubes, so reduced at a given pitch constancy, the diameter of the metering tubes. The same of course applies also vice versa. So it is, possibly at elevated Effort, difficult to achieve, the for a good volume constancy of the two sub-streams demanded and relatively slow flow velocities in both tube types, that is in the turbulence tubes and in the metering tubes, independently of each other to reach.

task the invention

It So is the object of the invention, a headbox of the beginning mentioned type to improve such that a largely independent metering of the additional Fluids at desired Total volume constancy of the individual, from the pulp suspension partial flow and partial fluid flow formed mixed partial flow is made possible.

These Task is inventively characterized solved, in that the means for metering in at least one fluid into the Variety of flow channels in the area of the turbulence generating means are provided such that each Flow channel at least in parts of the at least one in the associated means out Fluid on the outside is at least partially circulated, and that each flow channel with at least one metering opening each for at least partially receiving the fluid at least partially flowing around it is provided so that in the region of the metering a from the pulp suspension partial stream and the at least one recorded partial fluid flow formed Mixed partial stream is formed.

The inventive task is completely solved in this way.

By The invention becomes the possibility the addition of the additional Fluids without any dimensional dependence from the flow channels and created the means. The flow channels, for example in the form of thin-walled Turbulence tubes and / or turbulence tube inserts can be dimensioned independently of the mean so that's for a good volume constancy of the two sub-streams demanded and relatively slow flow velocities in both components due to greatest possible Flow areas at least in the area of metering can be achieved. moreover is the required total volume constancy of the mixed stream in detail flow channel the turbulence generating means and thus also throughout the turbulence generating means achieved easily. A low dynamics causes the desired low Loss energy, so that an inventive arrangement of the flow channels at relatively low downstream pressure losses can be realized.

All in all the invention also offers the possibility the largest possible Degree of freedom in the arrangement and in the design of the flow channels and the Medium.

moreover can by means of the invention, the demands made for the greatest possible Flow cross sections at relatively slow flow rates be realized with little effort.

In a first preferred embodiment It is proposed that the flow channels arranged in a column are such are provided that they at least partially from the at least one in the associated one Funds led Fluid on the outside either partially or completely to be flown around. In a practical way, all can be in one column arranged flow channels on the outside partially or completely fouled on the outside become. In an outside complete flow around the in the column arranged flow channels is also offered the opportunity that they are symmetrical or approximate symmetrical of the at least one in the associated means out Fluid on the outside completely enclosed become.

By this at least partially, possibly complete overlap the flow cross sections may be the division of the flow channels of the turbulence generating means be noticeably reduced. In addition, the cross-sectional area of the Means significantly larger than chosen in the known systems become.

In a further preferred embodiment, it is proposed that the means for metering in at least one fluid are designed such that in that the flow channels of at least two adjacent columns are at least partially completely or partially completely enclosed by the at least one fluid guided in the associated means, at least in sections. In this case, in turn, in a practical manner, means for metering in the at least one fluid can be completely or partially encased outside on the outside. And in the case of an externally complete flow around the flow channels arranged in the column, there is also the possibility that they are completely enveloped symmetrically or approximately symmetrically on the outside by the at least one fluid guided in the associated means.

By this at least partially, possibly complete overlap the flow cross sections at least two adjacent columns may be the pitch of the flow channels of the turbulence generating means again be noticeably reduced in size. Also, the cross sectional area of the Medium again significantly larger than chosen in the known systems become. Another decisive advantage is that the number of Means is at least halved, as a means at least the flow channels of two supplied adjacent columns. This creates a noticeable cost advantage with noticeably less control effort for the metered addition.

It is also advantageous if several flow channels at least in sections at least one cross-sectional taper and / or cross-sectional widening, wherein in the region of at least a respective cross-sectional change at least a metering opening is arranged. The change in cross section causes among other things a favorable one turbulence change at least within the pulp suspension partial stream. The flow velocity of the fluid can be changed by rowwise varying the geometries of the Flow channels in a certain way Dimensions constant being held. Depending on the orientation of the cross-section change For example, the fluid may flow in or against the flow direction of the pulp suspension partial flow are added, which in turn corresponding benefits, for example in terms of quality the volume constancy of the two partial streams arise.

Of the flow channel points in the range of at least one change in cross section prefers several, preferably two Zudosieröffnungen, in the flow channel preferably symmetrical to the flow direction the at least one pulp suspension partial stream is arranged are. As a result, in particular an improved quality of the volume constancy the two sub-streams reached.

Further has the flow channel at least one metering opening on, in an area opposite to the flow direction of at least a fluid in the flow channel is arranged. The area opposite to the flow direction of at least a fluid is here the back area of the flow channel. This area is the so-called dead water area, where this sets a lesser dynamic pressure at the metering point. Furthermore, the risk of sedimentation at this point is very low, because the dead water area is a "floating" area.

Of the flow channel Of course, too have several, preferably two Zudosieröffnungen, in an area opposite to the flow direction the at least one fluid in the flow channel is preferably symmetrical to the flow direction the at least one fluid are arranged. This will turn an improved quality reached the volume constancy of the two partial streams. Should more than two metering holes be present, they are preferably in the same distribution at the circumference of the flow channel arranged.

Further has at least one metering opening preferably a preferably circular, one in the flow direction the pulp suspension partial flow elongated, in particular oval or oblong, a rectangular, especially square, or similar Cross sectional area on. Thus, depending on the constructive and dimensional embodiment each given an optimal cross-sectional area for the corresponding Zudosieröffnung.

in the With regard to the arrangement of the means is in an advantageous manner provided that adjacent means in the flow direction of the pulp suspension partial flows to each other arranged offset, in particular in at least two rows alternately to each other are arranged offset. Also, at least two means in the flow direction the pulp suspension partial flow can be arranged one behind the other. The possible To favor orders of funds a variety of possible Zudosiermöglichkeiten. So can for example, by a first means the flow channels of a straight line and by a second means the flow channels of a Odd line of the turbulence generating means supplied with a fluid become. Also, means can with different qualities be added selectively and staggered.

The Cross sectional area of the individual agent is in the flow direction the at least one fluid preferably at least in sections constant and / or rejuvenated at least partially continuous and / or erratic. In case of a continuous taper of the cross-sectional area of the agent can under certain circumstances the flow velocity of the medium-flowing Fluid flow are kept constant.

Under In practical terms, the turbulence generating agent is in first embodiment of a turbulence generator, in which during operation of the headbox, the at least one pulp suspension through a plurality of preferably arranged in rows and in columns Flow channels flows through it divided into turbulent pulp suspension partial streams and after the Exiting the turbulence generator in a turbulence generator in flow direction the at least one pulp suspension downstream headbox again together is to allow the formation of a machine-wide fibrous web. in the Area of the turbulence generator are then means for metering provided by at least one fluid in the plurality of flow channels.

there the turbulence generator can at least one turbulence generator block and the funds can be formed as part of the Turbulenzerzeugerblocks or the turbulence generator may comprise at least one turbulence generator block and the funds can as part of at least one upstream of the turbulence generator block be arranged arranged component.

In second embodiment, the turbulence generating means is a tube bank and in the area of the tube bank are means for metering at least one fluid into the plurality provided the flow channels.

there can the tube bank at least one tube bank block and the funds can as Part of the tube bank block be formed or the tube bank can at least one tube bank block and the funds can as Part of at least one upstream of the tube bank block arranged Be formed component.

The Means for metering the at least one fluid into a plurality of flow channels can in the first preferred embodiment, a fluid distribution chamber with one - in flow direction the at least one fluid seen - preferably rectangular, in particular be square cross-sectional area. In the second preferred Embodiment, it may be a Fluidverteilbohrung with a - in the flow direction the at least one fluid seen preferably be circular cross-sectional area. Both preferred embodiments fulfill ideally the requirements placed on them with comparatively Great Production costs and good operating behavior.

The Fluid is preferably water, especially clear water, or from a pulp suspension, in particular white water whose Focusing on the average concentration of distinguishes at least one pulp suspension in the headbox. These types of fluids have similar Applications already well proven.

Of the Headbox according to the invention is excellently suited for use in a machine for producing a fibrous web, in particular paper or Board web. The manufactured in the machine with a headbox according to the invention Fibrous web has consistently excellent properties, Among other things, the regulation of both their fiber orientation cross profile as also their basis weight cross profile is possible.

example

Further Features and advantages of the invention will become apparent from the following Description of preferred embodiments with reference to the drawing. Show it

1a and 1b two vertical longitudinal sections through known headboxes of a machine for producing a fibrous web;

2 a schematic view of the at least one turbulence generating means of the headbox of 1 against the flow direction of the pulp suspension;

3 . 4 . 6 . 9 . 12 . 25 and 27 horizontal and partial longitudinal sections through various embodiments of a turbulence generating means of a head box according to the invention;

5 . 7 . 8th . 10 . 11 . 13 . 16 . 23 . 24 and 26 vertical and partial cross-sections through various embodiments of a turbulence generating means of a head box according to the invention;

14 and 15 horizontal and partial longitudinal sections through two embodiments of a turbulence generating means of a head box according to the invention;

17 and 18 vertical cross sections through two embodiments of a flow channel of a head box according to the invention;

19 . 20 . 21 and 22 Top views of various embodiments of a turbulence generating means of a head box according to the invention; and

28 a schematic partial sectional view of an embodiment of a turbulence generating means of a head box according to the invention.

The 1a and 1b show vertical longitudinal sections through headboxes 1 a machine for producing a fibrous web, in particular paper or board web, from a pulp suspension 2 , The illustrated headboxes 1 can of course also be designed as multi-layer casseroles, which use at least two different pulp suspensions for producing a fibrous web. The fibrous web may in particular be a paper, board or tissue web.

The Indian 1a illustrated headbox 1 has a pulp suspension 2 feeding feeder 3 For example, in the embodiment of a transverse distribution pipe shown 4 or a rotary distributor, not shown, with a plurality of hoses on.

Furthermore, the headbox has 1 via one of the feeder 3 in the flow direction S (arrow) of the pulp suspension 2 downstream turbulence generator 5 (Turbulence generating means). This turbulence generator 5 has a plurality of preferably in lines Z.1 to Z.4 and in columns S.1 to S.11 ( 2 ) arranged flow channels 6 ( 6.1 to 6:44 ) ( 2 ) on. The flow channels 6 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 flow cross sections.

When operating the headbox 1 become the flow channels 6 from the pulp suspension 2 flows through, where they are in turbulent pulp suspension partial streams 7 ( 7.1 to 7:44 ) ( 2 ) and after exiting the turbulence generator 5 in a turbulence generator 5 in the flow direction S (arrow) of the pulp suspension 2 downstream headbox nozzle 8th is rejoined to allow the formation of a machine-wide fibrous web. The headbox 8th can be considered as a machine-wide chamber.

Furthermore, in the area of the turbulence generator 5 medium 9 for the metered addition of at least one fluid 10 in the multitude of flow channels 6 ( 6.1 to 6:44 ) ( 2 ) intended. The Indian 1b illustrated headbox 1 corresponds at least in the second part of the flow path of the pulp suspension 2 in the 1a illustrated headbox. Thus, reference is hereby made to its description.

In extension to that in the 1a illustrated headbox 1 points the headbox 1 of the 1b between the pulp suspension 2 feeding feeding device 3 and the turbulence generator 5 and in the flow direction S (arrow) of the pulp suspension 2 both a tube bank 15 (further turbulence generating means) as a preferably machine-wide chamber 16 on. The chamber, also referred to as intermediate chamber 16 may have a plurality of partitions in a further embodiment, which at least partially subdivided into several sectioned sub-chambers.

The tube bank 15 has a plurality of preferably in lines Z.1 to Z.4 and in columns S.1 to S.11 ( 2 ) arranged flow channels 6 ( 6.1 to 6:44 ) ( 2 ) on. The flow channels 6 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 flow cross sections.

When operating the headbox 1 become the flow channels 6 from the pulp suspension 2 flows through, where they are in turbulent pulp suspension partial streams 7 ( 7.1 to 7:44 ) ( 2 ) and after leaving the tube bank 15 in the preferably machine-width chamber 16 is brought together again.

Further, in the area of the tube bank 15 medium 9 for the metered addition of at least one fluid 10 in the multitude of flow channels 6 ( 6.1 to 6:44 ) ( 2 ) intended.

For the expert it is self-evident that the turbulence generator 5 medium 9 for the metered addition of at least one fluid 10 in the multitude of flow channels 6 ( 6.1 to 6:44 ) ( 2 ). The means 9 are shown here by dashed lines. In this case, the number of lines and the number of columns of the two turbulence generating means 5 . 15 to be different.

The respective in the two 1a and 1b illustrated headbox 1 can both a straight basic contour ( 1a ) as well as a curved basic contour ( 1b ) exhibit. The in the two 1a and 1b represented means 9 can the respective fluid 10 both from above, from below as well as from both sides. Should have at least two remedies 9 be present as in the 1b is indicated, so the fluids 10 be supplied in a further embodiment also from opposite sides.

The 2 shows a schematic view of the turbulence generating means 5 (or 15 ) of the headbox 1 of the 1 opposite to the flow direction S (arrow) of the pulp suspension 2 , The turbulence generating agent 5 has a plurality of flow channels arranged in rows Z.1 to Z.4 and columns S.1 to S.11 6.1 to 6:44 , The flow channels provided in the peripheral zones S.1, S.11 6.1 . 6.11 . 6.12 . 6.22 . 6.23 . 6:33 . 6:34 . 6:44 turbulence generating means 5 can have a larger passage cross-section D than the remaining flow channels 6 have columns S.2 to S.10, which are not explicitly shown. In addition, the pitch of the arranged in the columns S1 to S11 flow channels 6.1 to 6:44 be different over the machine width M. For example, the marginal divisions may be larger than the central divisions.

The 3 to 28 now show sections and views in each sectional illustration of various embodiments of a turbulence generating means 5 a headbox according to the invention.

The in the 3 to 28 All embodiments shown are all in common that the means 9 for the metered addition of at least one fluid 10 in the multitude of flow channels 6 in the area of the turbulence generating means 5 are provided such that each flow channel 6.1 to 6:44 ( 2 ) at least in sections of the at least one in the associated means 9 guided fluid 10 outside is at least partially encircled, and that each flow channel 6.1 to 6:44 ( 2 ) with at least one metering opening each 11 for at least partially receiving the fluid at least partially flowing around it 10 is provided so that in the area of the metering opening 11 one from the pulp suspension partial stream 7.1 to 7:44 ( 2 ) and the at least one recorded partial fluid flow 10.1 to 11:44 ( 2 ) formed Mischteilstrom 12.1 to 12:44 ( 2 ) is formed.

The fluid 10 consists preferably of water, in particular clear water, and / or from a pulp suspension, in particular white water whose concentration is dependent on the average concentration of at least one pulp suspension 2 in the headbox 1 different.

Furthermore, in the 3 to 28 the same components only with a reference numeral, wherein the reference numeral from the basic number for the corresponding component and a letter, for example, A or B, consists. Different letters are used for the same components with different configurations, for example, in terms of alignment, dimensioning and the like.

The 3 and 4 show horizontal and fragmentary longitudinal sections through two embodiments of a turbulence generating means 5 a headbox according to the invention. The turbulence generating means 5 have flow channels arranged in columns SA 6.A that are at least in parts and symmetrical from the one in the corresponding means 9 guided fluid 10 be completely enveloped on the outside.

The middle 9 for metering in the fluid 10 in the corresponding, arranged in the column SA flow channel 6.A is a Fluidverteilbohrung 13 with a - in the flow direction F (arrow) of the fluid 10 seen preferably circular cross-sectional area QM.

The single metering opening 11 also has a flow direction T (arrow) of the pulp suspension partial flow 7.A elongated, in particular slot-like cross-sectional area QZ.

The illustrated and arranged in the columns SA flow channels 6.A have predominantly constant flow cross sections q. The flow channel 6.A of the 3 Moreover, it is at least partially convergent. He is also trained with a step change between two constant distances. The flow channel 6.A of the 4 is only at least partially divergent.

The 5 and 7 show vertical and fragmentary cross sections through various embodiments of a turbulence generating means 5 a headbox according to the invention. The 6 shows horizontal and partial longitudinal sections through the turbulence generating means 5 of the 5 and 7 , where she also the 3 equivalent.

The arranged in columns SA flow channels 6.A the turbulence generating means 5 in turn, at least in sections and symmetrically from that in the middle 9 guided fluid 10 completely surrounded on the outside.

The middle 9 for metering in the fluid 10 in the corresponding, arranged in the column SA flow channel 6.A is again a Fluidverteilbohrung 13 with a - in the flow direction F (arrow) of the fluid 10 Seen - preferably circular cross-sectional area QM. In the 5 is the cross-sectional area QM of the agent 9 in the flow direction F (arrow) of the fluid 10 at least partially constant, whereas the cross-sectional area QM of the agent 9 in the 7 in the flow direction F (arrow) of the fluid 10 at least partially rejuvenated by leaps and bounds. The increment is between two flow channels 6.A preferably in the middle orderly.

The respective metering opening 11 is in a region opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A arranged. The area is exactly opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A arranged. The individual metering openings 11 in turn have a flow direction T (arrow) of the pulp suspension partial flow 7.A elongated, in particular slot-like cross-sectional area QZ on ( 6 ).

The 8th and 10 show vertical and fragmentary cross sections through various embodiments of a turbulence generating means 5 a headbox according to the invention. The 9 shows horizontal and partial longitudinal sections through the turbulence generating means 5 of the 8th and 10 ,

The arranged in columns SA, SB flow channels 6.A . 6.B the turbulence generating means 5 in turn, at least in sections and symmetrically from that in the middle 9 guided fluid 10 partially surrounded on the outside. It can be seen that preferably centrally between two flow channels arranged in the gaps SA, SB 6.A . 6.B a common means 9 is arranged.

The middle 9 for metering in the fluid 10 in the corresponding, arranged in the column SA, SB flow channel 6.A . 6.B is again a Fluidverteilbohrung 13 with a - in the flow direction F (arrow) of the fluid 10 Seen - preferably circular cross-sectional area QM. In the 8th is the cross-sectional area QM of the agent 9 in the flow direction F (arrow) of the fluid 10 at least partially constant, whereas the cross-sectional area of the agent in the 10 in the flow direction F (arrow) of the fluid 10 at least partially rejuvenated by leaps and bounds. The increment is between two flow channels 6.A . 6.B preferably arranged centrally.

The respective metering opening 11 is again in a region opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A . 6.B arranged. The area lies opposite to the flow direction F (arrow) and below the perpendicular to the flow direction F (arrow) of the fluid 10 , The individual metering openings 11 are the centerline of the agent 9 facing and in turn have an elongated, in particular slot-like cross-sectional area QZ ( 9 ).

The 11 and 13 show vertical and fragmentary cross-sections through various embodiments of a turbulence generating means 5 a headbox according to the invention. The 12 shows horizontal and partial longitudinal sections through the turbulence generating means 5 of the 11 and 13 ,

The arranged in columns SA, SB flow channels 6.A . 6.B the turbulence generating means 5 in turn, at least in parts, of that in the middle 9 guided fluid 10 Completely outside, but asymmetrically circumscribed. It can be seen that preferably symmetrically to two flow channels arranged in the columns SA, SB 6.A . 6.B a common means 9 is arranged.

The middle 9 for metering in the fluid 10 in the corresponding, arranged in the column SA, SB flow channel 6.A . 6.B is again a Fluidverteilbohrung 13 with a - in the flow direction F (arrow) of the fluid 10 Seen - preferably circular cross-sectional area QM. In the 11 is the cross-sectional area QM of the agent 9 in the flow direction F (arrow) of the fluid 10 at least partially constant, whereas the cross-sectional area of the agent 9 in the 13 in the flow direction F (arrow) of the fluid 10 at least once and sometimes continuously rejuvenated. The taper is between two flow channels 6.A . 6.A respectively. 6.B . 6.B preferably arranged centrally.

The respective metering opening 11 is again in a region opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A . 6.B arranged. The area lies opposite to the flow direction F (arrow) of the fluid 10 and below the normal to the flow direction F (arrow) of the fluid 10 , The individual metering openings 11 are the centerline of the agent 9 facing and in turn have an elongated, in particular slot-like cross-sectional area QZ ( 12 ).

The 14 and 15 show horizontal and fragmentary longitudinal sections through two embodiments of a turbulence generating means 5 a headbox according to the invention.

The middle 9 for metering in the fluid 10 in the corresponding, arranged in the column SA flow channel 6.A is in turn a Fluidverteilbohrung 13 with a - in the flow direction F (arrow) of the fluid 10 seen - preferably circular cross-sectional area QM 9 flows around the arranged in the column SA flow channel 6.A in turn at least partially symmetrical and completely outside.

The illustrated flow channels 6.A have at least in sections at least one change in cross-section in reduction or enlargement of the flow cross-sections q. So learns the flow channel 6.A of the 14 a cross-sectional taper, whereas the flow channel 6.A of the 15 undergoes a cross-sectional widening. The continuous or discontinuous change in cross section can, as in the 14 shown in dashed form, basically at any distance of the flow around the flow channel 6.A respectively.

In the area of the change in cross section, there is additionally at least one metering opening 11 arranged. In the embodiments of the figures, there are two Zudosieröffnungen 11 that are in the flow channel 6.A preferably symmetsch to the flow direction T (arrow) of the pulp suspension partial stream 7.A are arranged. The fluid 10 can therefore counter to the flow direction T (arrow) of the pulp suspension partial flow 7.A ( 14 ) or in the flow direction T (arrow) of the pulp suspension partial stream 7.A ( 15 ) are added to the same.

The 16 shows a vertical and partial cross-section through a preferred embodiment of a turbulence generating means 5 a headbox according to the invention. The arranged in a column SA flow channel 6.A turbulence generating means 5 is at least in parts and symmetrical of that in the middle 9 guided fluid 10 completely surrounded on the outside.

The middle 9 for metering in the fluid 10 in the corresponding, arranged in the column SA flow channel 6.A is a Fluidverteilbohrung 13 with a - in the flow direction F (arrow) of the fluid 10 seen - preferably circular cross-sectional area QM.The cross-sectional area QM of the agent 9 is in the flow direction F (arrow) of the fluid 10 at least partially constant. In not shown place, the cross-sectional area QM of the agent 9 in the flow direction F (arrow) of the fluid 10 at least partially rejuvenate leaps and bounds. The increment is preferably between two flow channels 6.A preferably arranged centrally.

The metering opening 11 is in a region opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A arranged. The area is exactly opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A arranged. The metering opening 11 Here, a preferably circular, one in the flow direction T (arrow) of the pulp suspension partial flow 7.A have elongated, in particular oval or slot-like, a rectangular, in particular square, or similar cross-sectional area QZ.

The 17 and 18 show vertical cross sections through two embodiments of a flow channel 6.A a headbox according to the invention.

The flow channel 6.A of the 17 has several, a total of four Zudosieröffnungen 11 on, preferably in the same distribution at the periphery of the flow channel 6.A are arranged.

By contrast, the flow channel points 6.A of the 18 two metering holes 11 on, in an area opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A preferably symmetrical to the flow direction F (arrow) of the fluid 10 are arranged. The area lies opposite to the flow direction F (arrow) of the fluid 10 and below the normal to the flow direction F (arrow) of the fluid 10 ,

The Zudosieröffnungen shown in the two figures 11 can in turn a preferably circular, one in the flow direction T (arrow) of the pulp suspension partial stream 7.A have elongated, in particular oval or slot-like, a rectangular, in particular square, or similar cross-sectional area QZ.

The 19 . 20 . 21 and 22 show plan views of various embodiments of a turbulence generating means 5 a headbox according to the invention. The 23 shows a vertical and partial cross section through the turbulence generating means 5 of the 22 ,

The two 19 and 20 show turbulence generating means 5 whose neighboring funds 9.A . 9.B in the flow direction T (arrow) of the pulp suspension partial flows 7.A are arranged offset in at least two rows to each other.

The means 9.A . 9.B of the 19 serve the flow channels 6.A . 6.B a column SA, SB, where the means 9.A and the funds 9.B each in a row RA, RB are arranged. In addition, the funds flow around 9.A . 9.B the flow channels 6.A . 6.B completely on the outside. The Umfließung is preferably formed symmetrically.

Each arranged in a row RA, RB means 9.A . 9.B of the 20 operate in pairs adjacent flow channels 6.A . 6.B a line ZA of the turbulence generating means 5 , The flow channels 6.A . 6.B be at least partially from that in the middle 9.A . 9.B guided fluid 10 Completely outside, but asymmetrically circumscribed. It can be seen that preferably symmetrically to two flow channels arranged in the columns SA, SB 6.A . 6.B a common means 9.A . 9.B is arranged.

The two 21 and 22 show Turbu bailing generating means 5 whose means 9.A . 9.B in the flow direction T (arrow) of the pulp suspension partial flows 7.A arranged one behind the other.

The means 9.A . 9.B of the 21 serve the flow channels 6.A . 6.B a column SA, where the means 9.A . 9.B one behind the other in two rows RA, RB are arranged. In addition, the funds flow around 9.A . 9.B the flow channels 6.A completely on the outside. The circulation is preferably formed symmetsch.

The means 9.A of the 22 operate in pairs adjacent flow channels 6.A . 6.B a line ZA of the turbulence generating means 5 , The flow channels 6.A . 6.B be at least partially from that in the middle 9.A . 9.B guided fluid 10 partially surrounded on the outside. It can be seen that preferably symmetrically to two flow channels arranged in the columns SA, SB 6.A . 6.B a common means 9.A ., 9.B is arranged.

The 23 shows, as already stated, a vertical and partial cross-section through the turbulence generating means 5 of the 22 , This embodiment provides the possibility that two in the flow direction T (arrow) of the pulp suspension partial flow 7.A arranged one behind the other means 9.A . 9.B are formed such that in each case the fluid 10 in different flow channels 6.A . 6.B is added. The flow channels 6.A . 6.b lie in adjacent lines ZA, ZB

The 24 and 26 show vertical and fragmentary cross sections through various embodiments of a turbulence generating means 5 a headbox according to the invention. The 25 and 27 show horizontal and partial longitudinal sections through the turbulence generating means 5 of the 24 and 26 ,

The arranged in columns SA flow channels 6.A the turbulence generating means 5 in turn, at least in sections and symmetrically from that in the middle 9 guided fluid 10 completely surrounded on the outside.

The middle 9 for metering in the fluid 10 in several, arranged in columns SA flow channels 6.A is a fluid distribution chamber 14 with a - in the flow direction F (arrow) of the fluid 10 seen - preferably rectangular, in particular square cross-sectional area QM.The cross-sectional area QM of the agent 9 tapers in the flow direction F (arrow) of the one fluid 10 continuously. In a further, but not explicitly shown embodiment, the cross-sectional area QM of the agent can also taper in sections continuously and / or abruptly.

In the execution of 24 is the means 9 formed such that it arranged in a column SA flow channels 6.A at least in sections, symmetrically and completely outside flows around. On the other hand, that is the remedy 9 in the execution of 26 formed such that there are two arranged in each column SA flow channels 6.A at least partially, asymmetrically and completely outside.

The respective metering opening 11 is in a region opposite to the flow direction F (arrow) of the fluid 10 in the flow channel 6.A arranged.

The turbulence generating agent 5 may comprise at least one turbulence generating block and the means may be formed as part of the turbulence generating block, such as those in the 3 to 28 with the exception of 25 and 27 is shown.

In an alternative embodiment, the turbulence generating means 5 again comprise at least one turbulence generation block, the means 9 However, as in the 25 and 27 is shown, as part of an upstream of the turbulence generating block arranged component to be formed. The arrangement can be direct, ie direct ( 25 and 27 ), or indirectly, ie by means of a preferably machine-wide chamber.

The 28 shows a schematic partial sectional view of an embodiment of a turbulence generating means 5 a headbox according to the invention.

In contrast to the representations in the 3 to 27 are the flow channels 6 into which at least one fluid 10 from the agent 9 is supplied, not arranged in a single column SA. Rather, they extend through fluid 10 receiving flow channels 6 across multiple columns, where the means 9 at an angle alpha to the columns SA. The angle alpha may vary depending on the design of the turbulence generating means 5 assume different values.

Furthermore, the flow channels 6 from the respective fluid 10 at least partially, but also completely enveloped.

The characteristics of in the 3 to 28 described embodiments may also be at least partially combined with one another in a suitable manner for the person skilled in the art. The in the 3 to 28 headbox described is particularly suitable for use in a machine for producing a fibrous web, esp re paper or board web.

In summary It should be noted that a headbox of the invention initially mentioned type is created, the largely independent metering of the additional Fluids at desired Total volume constancy of the individual, from the pulp suspension partial flow and partial fluid flow formed mixed partial flow allows.

1

headbox

2

Fibrous suspension

3

feeder

4

transverse distribution

5

Turbulence generator (Turbulators)

6

flow channel

6.1 to 6.44

flow channel

6.A

flow channel

6.B

flow channel

7

Fibrous suspension partial flow

7.1 to 7.44

Fibrous suspension partial flow

7.A

Fibrous suspension partial flow

8th

headbox

9

medium

9.A

medium

9.B

medium

10

fluid

10.1 until 10.44

Fluid part stream

11

Zudosieröffnung

12.1 to 12.44

Mixed partial flow

13

Fluidverteilbohrung

14

fluid distribution chamber

15

Turbulence generator (Tube bank)

16

chamber

D

 Passage cross-section

F

Flow direction - fluid (Arrow)

M

machine width

QM

Cross-sectional area (middle)

QZ

Cross-sectional area (metering opening)

Q

Flow area (Flow channel)

R.A., R.B.

line

S

Flow direction - pulp suspension (Arrow)

S.1 to S.11

column

S.1, p.11

border zone

S.A.

column

S.B

column

T

Flow direction - pulp suspension part. (Arrow)

Z.1 to Z.4

row

Z.A

row

e.g.

row

alpha

angle

Claims (32)

Headbox ( 1 ) of a machine for producing a fibrous web, in particular paper or board web, from at least one pulp suspension ( 2 ), with at least one of the at least one pulp suspension ( 2 ) feeding device ( 3 ) and at least one turbulence generating means ( 5 . 15 ), in which the headbox ( 1 ) the at least one pulp suspension ( 2 ) by a plurality of preferably in rows (Z.1 to Z.4; ZA; ZA, ZB) and in columns (S.1 to S.11; SA, SA, SB) arranged flow channels ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) flows, thereby into turbulent pulp suspension partial streams ( 7 ; 7.1 to 7:44 ; 7.A ) and after exiting the turbulence generating means ( 5 . 15 ) in a preferably machine-width chamber ( 16 ), whereby in the area of the turbulence generating means ( 5 . 15 ) Medium ( 9 ; 9.A ; 9.A . 9.B ) for the metered addition of at least one fluid ( 10 ) in the plurality of flow channels ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ), characterized in that the means ( 9 ; 9.A ; 9.A . 9.B ) for the metered addition of at least one fluid ( 10 ) in the plurality of flow channels ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) in the region of the turbulence generating agent ( 5 . 15 ) are provided such that each flow channel ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) at least partially from the at least one in the associated means ( 9 ; 9.A ; 9.A . 9.B ) guided fluid ( 10 ) is at least partially circumscribed on the outside, and that each flow channel ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) with at least one metering opening each ( 11 ) for at least partially receiving the fluid flowing around it at least partially ( 10 ), so that in the region of the metering opening ( 11 ) from the pulp suspension partial stream ( 7 ; 7.1 to 7:44 ; 7.A ) and the at least one recorded partial fluid flow ( 10.1 to 10:44 ) formed Mischteilstrom ( 12.1 to 12:44 ) is formed. Headbox ( 1 ) according to claim 1, characterized in that the flow channels arranged in a column (S.1 to S.11; SA; SA, SB) ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) are provided such that they are at least partially separated from the at least one in the associated means ( 9 ; 9.A ; 9.A . 9.B ) guided fluid ( 10 ) outside either partially or completely. Headbox ( 1 ) according to claim 2, characterized in that all the flow channels arranged in one column (S.1 to S.11; SA; SA, SB) are ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) are provided such that, at least in parts, they are separated from the at least one in the associated means ( 9 ; 9.A ; 9.A . 9.B ) guided fluid ( 10 ) are partially flowed outside. Headbox ( 1 ) according to claim 2, characterized in that all the flow channels arranged in one column (S.1 to S.11; SA; SA, SB) are ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) are provided such that they are at least partially separated from the at least one in the associated means ( 9 ; 9.A ; 9.A . 9.B ) guided fluid ( 10 ) are completely enveloped on the outside. Headbox ( 1 ) according to claim 4, characterized in that the flow channels arranged in the gaps (S.1 to S.11; SA; SA, SB) ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) symmetric or approximately symmetrical of the at least one in the associated means ( 9 ; 9.A ; 9.A . 9.B ) guided fluid ( 10 ) are completely enveloped on the outside. Headbox ( 1 ) according to one of the preceding claims, characterized in that the means ( 9 ; 9.A ; 9.A . 9.B ) for the metered addition of at least one fluid ( 10 ) are formed such that the flow channels ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) of at least two adjacent columns (S.1 to S.44, SA, SB) at least in sections of the at least one in the associated means (S.1 to S.44; 9 ; 9.A ; 9.A . 9.B ) guided fluid ( 10 ) outside either partially or completely. Headbox ( 1 ) according to claim 6, characterized in that the means ( 9 ; 9.A ; 9.A . 9.B ) for metering the at least one fluid ( 10 ) are formed such that the flow channels ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) of at least two adjacent columns (S.1 to S.44, SA, SB) at least in sections of the at least one in the associated means (S.1 to S.44; 9 ; 9.A ; 9.A . 9.B ) guided fluid ( 10 ) are partially flowed outside. Headbox ( 1 ) according to claim 6, characterized in that the means ( 9 ; 9.A ; 9.A . 9.B ) for metering the at least one fluid ( 10 ) are formed such that the flow channels ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) of at least two adjacent columns (S.1 to S.44, SA, SB) at least in sections of the at least one in the associated means (S.1 to S.44; 9 ; 9.A ; 9.A . 9.B ) guided fluid ( 10 ) are completely enveloped on the outside. Headbox ( 1 ) according to claim 8, characterized in that the flow channels arranged in the gaps (S.1 to S.11; SA; SA, SB) ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) symmetric or approximately symmetrical of the at least one in the associated means ( 9 ; 9.A ; 9.A . 9.B ) guided fluid ( 10 ) are completely enveloped on the outside. Headbox ( 1 ) according to one of the preceding claims, characterized in that a plurality of flow channels ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) at least in sections at least one cross-sectional taper and / or cross-sectional widening, wherein in the region of the at least one respective cross-sectional change at least one Zudosieröffnung ( 11 ) is arranged. Headbox ( 1 ) according to claim 10, characterized in that the flow channel ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) in the region of the at least one change in the cross section a plurality, preferably two, metering openings ( 11 ), which in the flow channel ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) preferably symmetrically to the flow direction (T) of the at least one pulp suspension partial flow ( 7 ; 7.1 to 7:44 ; 7.A ) are arranged. Headbox ( 1 ) according to one of the preceding claims, characterized in that the flow channel ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) at least one metering opening ( 11 ), which in an area opposite to the flow direction (F) of the at least one fluid ( 10 ) in the flow channel ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) is arranged. Headbox ( 1 ) according to claim 12, characterized in that the flow channel ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) a plurality, preferably two metering openings ( 11 ), which in an area opposite to the flow direction (F) of the at least one fluid ( 10 ) in the flow channel ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) preferably symmetrically to the flow direction (F) of the at least one fluid ( 10 ) are arranged. Headbox ( 1 ) according to one of the preceding claims, characterized in that the flow channel ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) several metering openings ( 11 ), which preferably in the same distribution at the periphery of the flow channel ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) are arranged. Headbox ( 1 ) according to one of the preceding claims, characterized in that at least one metering opening ( 11 ) a preferably circular, one in the flow direction (T) of the pulp suspension partial stream ( 7 ; 7.1 to 7:44 ; 7.A ) has elongated, in particular oval or slot-like, a rectangular, in particular square, or similar cross-sectional area (QZ). Headbox ( 1 ) according to one of the preceding claims, characterized in that adjacent means ( 9 ; 9.A ; 9.A . 9.B ) in the flow direction (T) of the pulp suspension partial flows ( 7 ; 7.1 to 7:44 ; 7.A ) are arranged offset from each other. Headbox ( 1 ) according to claim 16, characterized in that adjacent means ( 9 ; 9.A ; 9.A . 9.B ) in the flow direction (T) of the pulp suspension partial flows ( 7 ; 7.1 to 7:44 ; 7.A ) are arranged alternately offset from one another in at least two rows (RA, RB). Headbox ( 1 ) according to one of the preceding claims, characterized in that at least two means ( 9 ; 9.A ; 9.A . 9.B ) in the flow direction ( 7 ) of the pulp suspension partial streams ( 7 ; 7.1 to 7:44 ; 7.A ) are arranged one behind the other. Headbox ( 1 ) according to claim 18, characterized in that the at least two in the flow direction ( 7 ) of the pulp suspension partial stream ( 7 ; 7.1 to 7:44 ; 7.A ) arranged one behind the other ( 9 ; 9.A ; 9.A . 9.B ) are formed such that in each case the at least one fluid ( 10 ) into different flow channels ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) is metered. Headbox ( 1 ) according to one of the preceding claims, characterized in that the cross-sectional area (QM) of the agent (QM) 9 ; 9.A ; 9.A . 9.B ) in the flow direction (F) of the at least one fluid ( 10 ) is at least partially constant. Headbox ( 1 ) according to one of the preceding claims, characterized in that the cross-sectional area (QM) of the agent (QM) 9 ; 9.A ; 9.A . 9.B ) in the flow direction (F) of the at least one fluid ( 10 ) at least partially continuously and / or rejuvenated. Headbox ( 1 ) according to one of the preceding claims, characterized in that the turbulence generating means is a turbulence generator ( 5 ) in which, during operation of the headbox ( 1 ) the at least one pulp suspension ( 2 ) by a plurality of preferably in rows (Z.1 to Z.4; ZA; ZA, ZB) and in columns (S.1 to S.11; SA; SA, SB) arranged flow channels ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) flows, thereby into turbulent pulp suspension partial streams ( 7 ; 7.1 to 7:44 ; 7.A ) and after leaving the turbulence generator ( 5 ) in a turbulence generator ( 5 ) in the flow direction (S) of the at least one pulp suspension ( 2 ) downstream headbox nozzle ( 8th ) is brought back together to allow the formation of a machine-width fibrous web, and that in the region of the turbulence generator ( 5 ) Medium ( 9 ; 9.A ; 9.A . 9.B ) for the metered addition of at least one fluid ( 10 ) in the plurality of flow channels ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) are provided. Headbox ( 1 ) according to claim 22, characterized in that the turbulence generator ( 5 ) has at least one turbulence generator block and that the means ( 9 ; 9.A ; 9.A . 9.B ) are formed as part of the turbulence generator block. Headbox ( 1 ) according to claim 22, characterized in that the turbulence generator ( 5 ) has at least one turbulence generator block and that the means ( 9 ; 9.A ; 9.A . 9.B ) are formed as part of at least one upstream of the turbulence generator block arranged component. Headbox ( 1 ) according to any one of the preceding claims, characterized in that the turbulence generating means is a tube bank ( 15 ) and that in the area of the tube bank ( 15 ) Medium ( 9 ; 9.A ; 9.A . 9.B ) for the metered addition of at least one fluid ( 10 ) in the plurality of flow channels ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) are provided. Headbox ( 1 ) according to claim 25, characterized in that the tube bank ( 15 ) has at least one tube bank block and that the means ( 9 ; 9.A ; 9.A . 9.B ) are formed as part of the tube bank block. Headbox ( 1 ) according to claim 25, characterized in that the tube bank ( 15 ) has at least one tube bank block and that the means ( 9 ; 9.A ; 9.A . 9.B ) are formed as part of at least one arranged upstream of the tube bank block component. Headbox ( 1 ) according to one of the preceding claims, characterized in that at least one means ( 9 ; 9.A ; 9.A . 9.B ) for metering the at least one fluid ( 10 ) into several flow channels ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) a Fluidverteilbohrung ( 13 ) with a - in the flow direction (F) of the at least one fluid ( 10 ) - is preferably circular cross-sectional area (QM). Headbox ( 1 ) according to one of claims 1 to 27, characterized in that at least one agent ( 9 ; 9.A ; 9.A . 9.B ) for metering the at least one fluid ( 10 ) into several flow channels ( 6 ; 6.1 to 6:44 ; 6.A ; 6.A . 6.B ) a fluid distribution chamber ( 14 ) with a - in the flow direction (F) of the at least one fluid ( 10 ) - is preferably rectangular, in particular square cross-sectional area (QM). Headbox ( 1 ) according to one of the preceding claims, characterized in that at least one fluid ( 10 ) consists of water, in particular clear water. Headbox ( 1 ) according to one of the preceding claims, characterized in that at least one fluid ( 10 ) consists of a pulp suspension, in particular white water, the concentration of which depends on the average concentration of the at least one fibrous suspension ( 2 ) in the headbox ( 1 ) is different. Machine for producing a fibrous web, in particular paper or board web, with a headbox ( 1 ) according to one of claims 1 to 31.