Headbox for a machine for producing a fibrous web

Headbox for a machine for producing a fibrous web
US 20120168105A1
(19) United States
(12) Patent Application Publication (10) Pub. No.: US 2012/0168105 A1
(43) Pub. Date:
Ruf et al.
(54)
HEADBOX FORA MACHINE FOR
PRODUCING A FIBROUS WEB
(76) Inventors:
(52)
(57)
Jul. 5, 2012
us. c1. ...................................................... .. 162/341
ABSTRACT
Wolfgang Ruf, Herbrechtingen
A headbox for a machine for producing a ?brous Web, in
(DE); Frank Fey, SchWabisch
Gmund (DE); Markus Haussler,
?brous stock suspension, includes a feeding device for feed
ing the at least one ?brous stock suspension; a perforated
Herbrechtingen (DE); Ole Hansen,
Heidenheim (DE)
particular a paper, cardboard or tissue Web from at least one
distribution pipe plate Which is arranged immediately doWn
stream from the feeding device in the How direction of the at
least one ?brous stock suspension and Which includes a plu
rality of How channels arranged in roWs and columns; an
(21) Appl. No.:
13/350,187
(22) Filed:
Jan. 13, 2012
direction of the at least one ?brous stock suspension and
Which extends in a Width direction of the headbox and
Related US. Application Data
includes tWo Walls, for example having the Width of the
machine; a turbulence generator Which is arranged immedi
ately downstream of the intermediate channel in the How
(63) Continuation of application No. PCT/EP2010/
056135, ?led on May 6, 2010.
(30)
Foreign Application Priority Data
intermediate channel Which is arranged immediately doWn
stream from the perforated distribution pipe plate in the How
direction of the at least one ?brous stock suspension and
Which has a plurality of How channels arranged in roWs and
columns; and a headbox noZZle Which is arranged immedi
ately downstream of turbulence generator in the How direc
tion of the at least one ?brous stock suspension and Which has
Jul. 15, 2009
(DE) .................. .. DE102009027721.8
Publication Classi?cation
(51)
Int. Cl.
D21F 1/02
(2006.01)
a noZZle gap. Feeding device, perforated distribution pipe
plate and intermediate channel are arranged in a ?rst align
ment plane, and turbulence generator and headbox noZZle are
arranged in a second alignment plane. The tWo alignment
planes form an angle in the range of >90 and <180°, for
example 2100 and §170°, or 2110 and §160°.
Patent Application Publication
Jul. 5, 2012
Sheet 1 0f 3
US 2012/0168105 A1
Em
A
Patent Application Publication
Jul. 5, 2012
Sheet 2 0f 3
US 2012/0168105 A1
Jul. 5, 2012
US 2012/0168105 A1
HEADBOX FOR A MACHINE FOR
PRODUCING A FIBROUS WEB
CROSS REFERENCE TO RELATED
APPLICATIONS
[0001] This is a continuation of PCT application No. PCT/
EP20l0/056135, entitled “HEADBOX FOR A MACHINE
FOR PRODUCING A FIBROUS WEB”, ?led May 6, 2010,
Which is incorporated herein by reference.
[0002]
through inlet openings in the Wall of the mixing chamber or
directly into the turbulence generator. In order to limit the
effect of the added dilution Water locally, separation Walls are
provided in some instances in the mixing chamber.
[0008] A headbox of this type With the described dilution
Water technology may also be equipped With an alternative
dilution Water system, for example “Jetco”, “Annular Gap
Metering” or “Injection System”. All knoWn dilution Water
systems by Well-known manufacturers of machinery for the
production of a ?brous Web are systems Which can only more
or less effectively, or in other Words only partially ful?ll the
BACKGROUND OF THE INVENTION
demands for effective blending of ?brous stock suspension
1. Field of the Invention
and dilution Water, su?icient volume ?oW consistency, a
small effective Width and a small mapping offset.
[0009] Nonetheless, local addition of dilution Water into
[0003] The present invention relates to a headbox for a
machine for producing a ?brous Web, a paper, cardboard or
tissue Web from at least one ?brous stock suspension, includ
ing a feeding device for feeding the at least one ?brous stock
suspension; a perforated distribution pipe plate Which is
arranged immediately doWnstream from the feeding device in
a ?oW direction of the at least one ?brous stock suspension
and Which includes a plurality of ?oW channels arranged in
roWs and columns; an intermediate channel Which is arranged
immediately doWnstream from the perforated distribution
pipe plate in the ?oW direction of the at least one ?brous stock
suspension and Which extends in a Width direction of the
headbox and includes tWo Walls, for example having the
Width of the machine; a turbulence generator Which is
arranged immediately doWnstream of the intermediate chan
nel in the ?oW direction of the at least one ?brous stock
suspension and Which has a plurality of ?oW channels
arranged in roWs and columns; and a headbox noZZle Which is
arranged immediately doWnstream of the turbulence genera
the headboxes has proven especially advantageous in many
applications. In such instances it is desirable to retro?t
already existing and otherWise still usable headboxes to this
neW dilution Water technology described at the beginning. For
this purpose previously large and also heavy components of
the headbox must be removed and, accepting a high risk
during transport, must be brought to the supplier since, as a
rule, the necessary reWork and adaptions can only be carried
out there. Due to these missing parts the headbox is not usable
during this period. Moreover, retro?tting the removed head
box is very expensive and possibly also associated With tech
nological risks.
[0010]
What is needed in the art is an improved headbox so
that a technically simple and reliable dilution Water system
may be realiZed. Moreover, it should be cost-effective and
represent a more favorable retro?t solution With less doWn
time.
tor in the ?oW direction of the at least one ?brous stock
SUMMARY OF THE INVENTION
suspension and Which has a noZZle gap. The feeding device,
the perforated distribution pipe plate and the intermediate
[0011]
channel are arranged in a ?rst alignment plane, and the tur
bulence generator and the headbox noZZle are arranged in a
at least on one WaIIiWhICh is for example the Width of the
machine4of the intermediate channel a plurality of metering
second alignment plane. The tWo alignment planes form an
angle in the range of approximately >90 and <l80°, for
devices Which are spaced apart from each other in a Width
direction as Well as in a longitudinal direction of the headbox.
example 2100 and §l70°, or 2110 and 21609
[0004] 2. Description of the Related Art
[0005] A headbox of this type has been knoWn in expert
circles already for several years and is built and distributed for
for controlled metered addition of a ?uid in partial ?uid
streams into the at least one ?brous stock suspension. The
example by Voith Paper under the “W-Headbox” label. It is
preferably used in paper or cardboard machines having a
so-called Fourdrinier Wire forming unit.
[0006] It is knoWn that more recent developments on the
headbox in machines for producing a ?brous Web have
resulted in that, in addition to the actual ?brous stock suspen
sion Which is required to produce the ?brous Web an addi
tional controlled addition of a ?uid, for example Water or
?brous suspension having a different stock consistency Which
is knoWn in expert circles as “dilution Water”, occurs. This
addition occurs at several locations Which are distributed
across the Width of the headbox. The volume and/or the
characteristic of the dilution Water are hereby adjustable.
Through this measure the basis Weight cross pro?le can for
example be e?iciently controlled, and/or occurrence of cross
?oWs in the headbox effectively prevented.
The present invention provides a headbox having on
The plurality of metering devices are arranged for example
individual metering devices for the controlled, metered addi
tion of the ?uid in at least one partial ?uid stream into the at
least one ?brous stock suspension includes a metering chan
nel having a metering channel opening and a metering chan
nel center line. The respective metering channel opening of
the metering channel of the individual metering device for
controlled metered addition of the ?uid in at least one partial
?uid stream into the at least one ?brous stock suspension is
aligned such that the metering channel center line of the
metering channel impinges on the turbulence generator When
forming an impingement point. The turbulence generator is
hereby preferably a turbulence generator knoWn to the expert.
[0012] The headbox according to the present invention
alloWs realiZation of a technically simple and reliable dilution
Water system. Even With possibly locally greatly differing
dilution Water or respectively ?uid volumes, a good volume
?oW consistency is achieved across the entire machine Width
and, due to the addition of the dilution Water or respectively
the ?uid into the direct catchment area of the turbulence
generator a narroW and sharply de?ned effective response in
[0007] A headbox of this type With the described dilution
Water technology is knoWn for example from document DE
41 19 593 C2 (“ModuleJet”). The preferably controlled
metered addition of the dilution Water in partial streams into
the ?brous Web is produced. “Straying” of the partial stream
the at least one ?brous stock suspension occurs hereby
of dilution Water or respectively ?uid can occur only to a very
Jul. 5, 2012
US 2012/0168105 A1
limited extent. Due to the targeted, locally stable and, for
example controlled, metered addition of the dilution Water or
tion of the ?uid in at least one partial ?uid stream into the at
least one ?brous stock suspension is aligned such that the
metering channel center line of the metering channel may
respectively the ?uid and the intensive blending in the ?oW
channels of the turbulence generator doWnstream from the
metering Zone, With separate guidance of the blended streams
impinge outside or inside the roW of the adjacent ?oW chan
nels onto the turbulence generator When forming an impinge
to the beginning of the headbox noZZle, the demands upon an
ment point. The impingement outside the metering channel
optimum dilution Water system are extensively, even com
center line can hereby assume a value of up to 50% of the
pletely met.
[0013] The headbox according to the present invention is
column separation of the ?oW channels. The effective
impingement surface can thereby be effectively enlarged so
also a more suitable retro?t solution With less doWntime,
that again, very stable conditions are achieved in regard to
compared With the already knoWn retro?t solutions. Basically
volume ?oW consistency.
[0017] The metering channel center line of the metering
only at least one Wall of the intermediate channel must be
equipped With the metering devices for controlled metered
addition of the dilution Water or respectively the ?uid in
partial streams into the at least one ?brous stock suspension.
The remaining components and component groups of the
previous headbox can remain and can continue to be used
Without any changes. The headbox according to the present
invention can be implemented easily and Without problems
locally on-site of the existing machine for the production of a
?brous Web.
[0014] In a ?rst embodiment of the headbox according to
the present invention, the respective metering channel open
ing of the metering channel of the individual metering devices
for controlled metered addition of the ?uid in at least one
partial ?uid stream into the at least one ?brous material sus
pension is aligned such that the metering channel center line
of the metering channel impinges for example approximately
centered, or centered betWeen the columns of tWo adjacent
?oW channels onto the turbulence generator When forming an
impingement point. A division of the added partial ?uid
stream occurs. Since the added partial ?uid stream does not
?oW directly into at least one ?oW channel of the turbulence
generator very stable conditions in regard to the volume ?oW
consistency are achieved. Moreover, Water jet pumping
effects and similar phenomena are extensively avoided and
lead to only insigni?cant in?uences, even at changing vol
umes of the partial ?uid streams.
[0015] An additional embodiment of the headbox accord
ing to the present invention provides that the ?oW channels of
the turbulence generator Which are arranged in one roW, fea
ture a roW separation of the ?oW channels and that the meter
ing channel center lines of the metering channels of the meter
ing devices for controlled metered addition of the ?uid in
partial ?uid streams into the at least one ?brous stock suspen
sion located at a distance from each other in the Width direc
tion of the headbox Which are allocated to the ?oW channels
of the turbulence generator located in this roW feature a roW
separation of the metering channel center lines, Whereby the
roW separation of the metering channel center lines assumes
the same or double the value of the roW separation as the ?oW
channels. If hoWever, the tWo roW separations assume the
same value then precisely one roW of metering channels is
allocated to each roW of ?oW channels. If in contrast, the roW
separation of metering channel center lines assumes double
the value of the roW separation of the ?oW channels, then one
roW of metering channels is allocated only to every second
roW of ?oW channels. The roW separation of the ?oW channels
may for example assume a value of 25, 33, 50, 66 or 100
millimeters (mm).
[0016]
Furthermore, a third embodiment of the headbox
according to the present invention provides that the respective
metering channel opening of the metering channel of the
individual metering devices for the controlled metered addi
channel may of course also impinge on the turbulence gen
erator inside the roW of the adjacent ?oW channels When
forming an impingement point. In this possible layout, the
impingement point of the metering channel center line of the
metering channel of the metering device then aligns With the
tWo adjacent ?oW channels of the turbulence generator.
[0018] Moreover, the ?oW channels of the turbulence gen
erator arranged in one column feature a column separation of
the ?oW channels and the metering channel center lines of the
metering channels of the metering devices for controlled,
metered addition of the ?uid in partial ?uid streams into the at
least one ?brous stock suspension joining at different heights
Which are allocated to the ?oW channels of the turbulence
generator Which are located in the column feature a column
separation of the metering channel center lines, Whereby the
column separation of the metering channel center lines can
assume the same, or double the value of the column separa
tion of the ?oW channels. If noW, the tWo column separations
assume the same value, then precisely one column of meter
ing channels is allocated to each column of ?oW channels. If
in contrast, the column separation of metering channel center
lines assumes double the value of the column separation of
the ?oW channels, then one column of metering channels is
allocated only to every second column of ?oW channels.
[0019] The respective metering channel opening of the
metering channel of the individual metering devices for con
trolled metered addition of the ?uid in at least one partial ?uid
stream into the at least one ?brous stock suspension can of
course also be aligned such, that the metering channel center
line of said metering channel impinges centered or approxi
mately centered, or if required also slightly offset on a ?oW
channel of the turbulence generator When forming an
impingement point.
[0020]
Moreover, the ?oW channels of the turbulence gen
erator located in tWo adjacent roWs can be arranged offset
relative to each other, for example center-offset. The distance
betWeen the ?oW channels of the turbulence generator located
in adjacent roWs is hereby considerably increased. This in
turn leads to an advantageous enlargement of the effective
impingement surface, so that again, very stable conditions are
achieved in regard to the volume ?oW consistency.
[0021] The ?oW channels of the turbulence generator
located in tWo adjacent roWs can of course also be arranged
Without offset relative to each other. A rectangular arrange
ment grid is hereby created for the ?oW channels of the
turbulence generator.
[0022] In another embodiment the metering channels of the
metering devices located in one column for, for example,
controlled metered addition of the ?uid in partial ?uid
streams into the at least one ?brous stock suspension are
connected With a common supply channel. Thereby a techni
Jul. 5, 2012
US 2012/0168105 A1
cally elegant, cost-effective layout is achieved which is ?uidic
and technologically not disadvantageous.
[0023] In an alternative embodiment each metering chan
nel of the individual metering devices for controlled metered
addition of the ?uid in partial ?uid streams into the at least one
?brous stock suspension is connected with its own supply
stood by reference to the following description of embodi
ments of the invention taken in conjunction with the accom
panying drawings, wherein:
[0031] FIG. 1 is a vertical and schematic longitudinal sec
tional view of one design form of a headbox for a machine to
produce a ?brous web in accordance with the current state of
channel. This technically expensive design provides the
advantage of greater arrangement possibilities, in particular
the art;
also during the operation of the machine for the production of
embodiment of an inventive headbox for a machine to pro
a ?brous web.
duce a ?brous web;
[0033] FIG. 3 is a partial and schematic sectional view of a
[0024] The respective metering channel opening of the
individual metering channel of the metering devices for con
trolled metered addition of the ?uid in at least one partial ?uid
stream into the at least one ?brous stock suspension is located
at a vertical and uniform or approximately uniform distance
in the range of approximately 1 to 50 mm, for example 3 to 30
mm, or 10 to 30 mm from the turbulence generator. This
provides the advantage of a space saving arrangement at
?uidic and technologically optimum operating conditions of
[0032]
FIG. 2 is a partial schematic sectional view of a ?rst
second embodiment of an inventive headbox for a machine to
produce a ?brous stock suspension;
[0034] FIG. 4 is an illustration of a ?rst metered addition
arrangement in an inventive headbox for a machine to pro
duce a ?brous web; and
[0035] FIG. 5 is an illustration of a second metered addition
arrangement in an inventive headbox for a machine to pro
duce a ?brous web.
the machine for the production of a ?brous web.
[0036]
[0025]
sponding parts throughout the several views. The exempli?
Moreover, the respective metering channel of the
Corresponding reference characters indicate corre
in at least one partial ?uid stream into the at least one ?brous
stock suspension can have at least in part a constant or an
cations set out herein illustrates embodiments of the invention
and such exempli?cations are not to be construed as limiting
the scope of the invention in any manner.
intermittently enlarging cross sectional inside surface. An
improvement of distribution in the Z-direction can hereby be
DETAILED DESCRIPTION OF THE INVENTION
brought about.
[0026] The respective metering devices for controlled
[0037] Referring now to the drawings, and more particu
larly to FIG. 1, there is shown a vertical and schematic lon
metered addition of the ?uid in at least one partial ?uid stream
gitudinal view of an exemplary design form of headbox 1 for
into the at least one ?brous stock suspension may include a
a machine to produce ?brous web 3 from ?brous stock sus
pension 2. Illustrated headbox 1 may of course also be
designed as a multi-layer headbox which utiliZes at least two
metering devices for controlled metered addition of the ?uid
metering pipe. This embodiment of the metering device pos
sesses optimum ?uidic properties and is in addition especially
suitable in regard to production-technical aspects. The meter
ing pipe may hereby assume any known pipe cross section,
different ?brous stock suspensions to produce ?brous web 3.
Fibrous web 3 can hereby be a paper, cardboard or tissue web.
namely round, approximately round, oval, triangular, rectan
[0038]
gular, square, etc.
in the embodiment of illustrated cross distribution pipe 5 or a
[0027]
circular distributor having a plurality of tubes and which is
not illustrated, feeding one ?brous stock suspension 2.
[0039] Viewed in ?ow direction R (arrow) of ?brous stock
Moreover, the respective metering channel of the
metering pipe can have a rotationally symmetrical cross sec
tional inside surface along its metering channel center line,
Headbox 1 includes one feed device 4, for example
and the individual metering pipe can have a rotationally sym
suspension 2, for example three-row perforated distribution
metrical outside surface with a diameter in the range of
approximately 3 to 25 mm, for example 4 to 16 mm, or 5 to 10
mm. The ?uidic properties of the metering devices can here
pipe plate 6 is located immediately downstream from feed
with be improved further.
[0028] The ?uid consists, for example, of water, such as
clari?ed water or a ?brous stock suspension, in particular
white water, whose concentration is different than the average
concentration of the at least one ?brous stock suspension
?owing through the headbox. These types of ?uids have
already proven themselves well in similar applications.
[0029] The inventive headbox is extremely well suited for
device 4 and which is equipped with a plurality of ?ow chan
nels 7 which are arranged in three rows Z and several columns
S. In a different, not illustrated embodiment, the number or
rows Z can of course also be less than or greater than three.
[0040] Again, in ?ow direction R (arrow) of ?brous stock
suspension 2 intermediate channel 8 extending in width
direction B (arrow) of headbox 1 and preferably two
machine-wide walls 9.1, 9.2 is located immediately down
stream.
[0041]
In ?ow direction R (arrow) of ?brous stock suspen
sion 2, for example three-row, turbulence generator 1 0 having
utiliZation in a machine for the production of a ?brous mate
rial web, especially a paper or cardboard web. The ?brous
material web produced in the machine with at least one inven
a plurality of ?ow channels 11 arranged in three rows Z and in
several columns S is located immediately downstream from
tive headbox possesses outstanding properties throughout,
intermediate channel 8 (compare FIGS. 4 and 5). The number
since among other advantages, control of its ?ber orientation
of rows Z can of course be less than or greater than three.
cross pro?le as well as its base weight cross pro?le is pos
sible.
[0042] During operation of headbox 1, ?brous stock sus
pension 2 is divided into partial ?brous stock suspension
streams in turbulence generator 10 and, after emerging from
turbulence generator 10 is brought together again in machine
BRIEF DESCRIPTION OF THE DRAWINGS
wide chamber 12 in the embodiment of headbox noZZle 13
including noZZle gap 14 in order to enable formation of
[003 0] The above-mentioned and other features and advan
tages of this invention, and the manner of attaining them, will
machine-wide ?brous web 3. As already known, ?ow chan
become more apparent and the invention will be better under
nels 6 of turbulence generator 10 are in the embodiment of,
Jul. 5, 2012
US 2012/0168105 A1
for example, thin-walled turbulence pipes and/or turbulence
pipe inserts with at least partially constant, at least partially
divergent, at least partially convergent and/ or intermittent
cross sectional surfaces.
[0043] If necessary, headbox noZZle 13 may be equipped on
its outlet side with at least one baf?e 15 which is indicated by
dashed lines.
[0044]
A separating element which is well known to the
expert and which is not explicitly illustrated, such as a
lamella, may also be provided in headbox noZZle 13. If a
face 19.1 along metering channel center line 19.M. Individual
metering pipe 17.1 furthermore may have a rotationally sym
metrical outside surface 19 .A with diameter 19 .D in the range
of approximately 3 to 25 mm, for example 4 to 16 mm, or 5 to
10 mm.
[0051]
Individual supply channel 19 of metering devices 17
moreover includes at least in parts a constant or a intermit
tently enlarging cross sectional surface inside 19.1.
[0052] Individual metering channel opening 19.1 of meter
ing channel 19 of individual metering device 17 for controlled
multitude of separating elements, especially lamellas are pro
vided in headbox noZZle 13, they can have different lengths
and possibly also different properties, such as surface pro
?les, etc.
metered addition of ?uid 18 in at least one partial ?uid stream
18.T (arrow) into at least one ?brous stock suspension 2 is
[0045] Moreover, feeding device 4, perforated distribution
forming impingement point AP (cross).
plate 6 and intermediate channel 8 are arranged in ?rst align
ment plane AE.1, and turbulence generator 10 and headbox
noZZle 13 are arranged in second alignment plane AE.2. The
two alignment planes AE.1, AE.2 form obtuse angle 0t in the
range of approximately >90 and <l80°, for example 2100
and §l70°, or 2110 and g 1 60°. Headbox 1 therefore exhib
its considerable redirection 16.
[0046] Referring now to FIG. 2, there is shown a partial
schematic sectional view of a ?rst embodiment of headbox 1
according to the present invention for a machine to produce a
aligned such that metering channel center line 19.M of meter
ing channel 19 impinges on turbulence generator 10 when
[0053] Moreover, metering channels 19 of metering
devices 17 for controlled metered addition of ?uid 18 (arrow)
in partial ?uid streams 18.T (arrow) into ?brous stock sus
pension 2 which are arranged in one column S are connected
with common supply channel 20. Supply channel 20 in turn is
connected with a supply system for ?uid 18 which is not
illustrated, whereby a device which is known to the expert and
which therefore is not explicitly illustrated, for example a
valve for controlled metered addition of ?uid 18 (arrow) may
?brous web from ?brous suspension 2 (arrow). The illus
be provided in supply channel 20 and/or in the supply system.
[0054] Obviously, every metering channel of the individual
trated segment is indicated in FIG. 1 in a circle K with dashed
lines.
metering devices for controlled metered addition of the ?uid
in partial ?uid streams into the ?brous stock suspension can
[0047] The basic construction of this partially and sche
matically illustrated headbox 1 is substantially consistent
with the basic construction of headbox 1 schematically
depicted in FIG. 1. We therefore refer to the description
also be connected in a non-illustrated manner with its own
provided for that drawing. It can be clearly seen that interme
diate channel 8 is arranged in ?rst alignment plane AE.1 and
turbulence generator 10 is arranged in second alignment
plane AE.2. The two alignment planes AE.1, AE.2 form
obtuse angle 0t in the range of approximately >90 and <1 80°,
for example 2 100 and 2 170°, or 2110 and g 1 60°. Headbox
1 therefore exhibits considerable redirection 16.
[0048]
On the upper and, for example, machine-wide wall
9.2 of intermediate channel 8 a plurality of metering devices
17 which are spaced apart from each other in width direction
B (arrow) as well as longitudinal direction L (arrow) of head
box 1 are arranged for example for the controlled metered
addition of ?uid 18 (arrow) in partial ?uid streams 18.T
(arrows) into ?brous stock suspension 2 (arrow). Due to the
addition of ?uid 18 (arrow) in partial ?uid streams 18.T
(arrow) into ?brous stock suspension 2 (arrow) blended par
tial streams 2.1 (arrow) result which are then combined to a
common blended stream in the headbox noZZle. The metering
devices for controlled metered addition of ?uid 18 in partial
?uid stream 18.T (arrow), for example valves, are well known
by the expert and are therefore not explicitly illustrated.
[0049]
Individual metering devices 17 for controlled,
metered addition of ?uid 18 (arrow) in at least one partial ?uid
stream 18.T (arrow) into at least one ?brous stock suspension
2 includes metering channel 19 including metering channel
opening 19.1 and metering channel center line 19.M. Respec
tive metering devices 17 for controlled, metered addition of
?uid 18 in at least one partial ?uid stream 18.T (arrow) into at
least one ?brous stock suspension 2 includes one metering
pipe 17.1.
[0050] Respective metering channel 19 of metering pipe
17.1 has rotationally symmetrical cross sectional inside sur
supply channel.
[0055] Moreover, respective metering channel opening
19.1 of metering channel 19 of metering devices 17 for con
trolled metered addition of ?uid 18 in at least one partial ?uid
stream 18.T (arrow) into ?brous stock suspension 2 is located
at vertical and uniform or approximately uniform distance A
in the range of approximately 1 to 50 mm, for example 3 to 30
mm, or 10 to 30 mm from turbulence generator 10. Metering
channel opening 19.1 of respective metering channel 19 of
individual metering device 17 is also arranged parallel or
approximately parallel to infeed side 10E of turbulence gen
erator 10. Obviously it can also be arranged in a non-illus
trated manner at an angle to the infeed side of the turbulence
generator.
[0056]
Referring now to FIG. 3, there is shown a partial and
schematic sectional view of a second embodiment of headbox
1 according to the present invention for a machine to produce
a ?brous web from ?brous stock suspension 2 (arrow). The
illustrated segment is indicated in FIG. 1 in circle K with
dashed lines. The basic construction of this partially and
schematically illustrated headbox 1 is substantially consis
tent with the basic construction of headbox 1 schematically
depicted in FIG. 1. We therefore refer to the description
provided for that drawing.
[0057]
It can be clearly seen that intermediate channel 8 is
arranged in ?rst alignment plane AE.1 and turbulence gen
erator 10 is arranged in second alignment plane AE.2. The
two alignment planes AE.1, AE.2 form obtuse angle 0t in the
range of approximately >90 and <l80°, for example 2100
and §l70°, or Z1 10 and g 1 60°. Headbox 1 therefore exhib
its considerable redirection 16.
[0058]
On the upper and, for example machine-wide, wall
9.2 of intermediate channel 8 a plurality of metering devices
17 which are spaced apart from each other in width direction
B (arrow) as well as in longitudinal direction L (arrow) of
Jul. 5, 2012
US 2012/0168105 A1
headbox 1 are arranged for example for controlled metered
addition of ?uid 18 (arrow) in partial ?uid streams 18.T
(arroW) into ?brous stock suspension 2 (arroW). Due to the
addition of ?uid 18 (arroW) in partial ?uid streams 18.T
[0066]
Referring noW to FIGS. 4 and 5, there are shoWn tWo
metering arrangements of inventive headbox 1 according to
the present invention for a machine to produce a ?brous Web.
(arroW) into ?brous stock suspension 2 (arroW) blended par
In the example, ?oW channels 11 of turbulence generator 10
are arranged in three roWs Z.1 through Z.3 (Z) and in four
tial streams 2.1 (arroW) result Which are then combined to a
common blended stream in the headbox noZZle. The metering
meandering columns 81 through 8.4 (S).
devices for controlled metered addition of ?uid 18 in partial
?uid stream 18.T (arrow), for example valves, are Well knoWn
by the expert and are therefore not explicitly illustrated.
[0059]
Individual metering devices 17 for controlled,
metered addition of ?uid 18 in at least one partial ?uid stream
18.T (arroW) into at least one ?brous stock suspension 2
includes metering channel 19 including metering channel
opening 19.1 and metering channel center line 19.M. Respec
tive metering device 17 for controlled, metered addition of
?uid 18 in at least one partial ?uid stream 18.T (arroW) into at
least one ?brous stock suspension 2 includes one metering
pipe 17.1.
[0060] Respective metering channel 19 of metering pipe
[0067] In both arrangements, ?oW channels 11 of turbu
lence generator 10 Which are arranged in tWo adjacent roWs
Z1, Z2 and Z.3 are arranged offset relative to each other. In
the tWo present illustrations they are center-offset relative to
each other, so that ?oW channels 11 of loWer roW Z1 and ?oW
channels 11 of upper roW Z.3 feature the same layout in Width
direction B (double arroW) of headbox 1.
[0068] The ?oW channels of the turbulence generator
located in tWo adjacent roWs can of course also be arranged
Without offset relative to each other. A rectangular arrange
ment grid is hereby created for the ?oW channels of the
turbulence generator.
[0069] Moreover, metering channel openings 19.1 of
metering pipe 17.1 furthermore may have rotationally sym
metering channels 19 of metering devices 17 in the embodi
ment of metering pipe 17.1 Which is indicated by dashed
lines, for controlled metered addition of the ?uid in partial
metrical outside surface 19.A With diameter 19.D in the range
of approximately 3 to 25 mm, for example 4 to 16 mm, or 5 to
illustrated.
17.1 has rotationally symmetrical cross sectional inside sur
face 19.1 along metering channel center line 19.M. Individual
10 mm.
[0061]
Individual supply channel 19 of metering device 17
moreover includes at least in parts a constant or an intermit
tently enlarging cross sectional surface inside 19.1.
[0062] Individual metering channel opening 19.1 of meter
ing channel 19 of individual metering device 17 for controlled
metered addition of ?uid 18 in at least one partial ?uid stream
18.T (arroW) into at least one ?brous stock suspension 2 is
aligned such that metering channel center line 19.M of meter
ing channel 19 impinges on turbulence generator 10 When
forming impingement point AP (cross).
[0063] Moreover, metering channels 19 of metering
devices 17 Which are arranged in one column S for controlled
metered addition of ?uid 18 in partial ?uid streams 18.T
(arroW) into at least one ?brous stock suspension 2 are con
nected With common supply channel 20. Supply channel 20 in
turn is connected With a supply system for ?uid 18 Which is
not illustrated, Whereby a device Which is knoWn to the expert
and Which therefore is not explicitly illustrated, for example a
valve for controlled metered addition of ?uid 18 (arroW) may
be provided in supply channel 20 and/or in the supply system.
[0064] Obviously, every metering channel of the individual
?uid streams into the at least one ?brous stock suspension are
[0070] Individual metering channel opening 19.1 of meter
ing channel 19 of metering device 17 is thereby aligned such
that metering channel center line 19.M of each metering
channel 19 of metering devices 17 impinges approximately in
the center, or in the center betWeen columns 82 and 8.3 of
tWo adjacent ?oW channels 11 onto turbulence generator 10
When forming impingement point AP.
[0071]
Moreover, ?oW channels 11 of turbulence generator
10 arranged in one roW Z1, Z2 and Z.3 feature a roW sepa
ration of ?oW channels TZ.11. The roW separation of the ?oW
channels can assume a value for example of approximately
25, 33, 50, 66 or 100 mm. Metering channel center lines 19.M
of metering channels 19 of metering devices 17 located at a
distance from each other in Width direction B (arroW) of
headbox 1 Which are allocated to ?oW channels 11 of turbu
lence generator 10 Which are arranged in this roW Z1, Z2 and
Z.3 feature a roW separation of metering channel center lines
TZ.19.M. In the tWo present illustrations, the roW separation
of metering channel center lines TZ.19.M assumes double the
value of the roW separation of ?oW channels TZ.11. Obvi
ously the tWo roW separations TZ.19.M and TZ.11 can also
assume the same value.
metering devices for controlled metered addition of the ?uid
[0072]
in partial ?uid streams into the at least one ?brous stock
10 Which are arranged in one column 8.2 and 8.3 feature
suspension can also be connected in a non-illustrated manner
column separation TS.11. Metering channel center lines
19.M of metering channels 19 of metering devices 17 Which
With its oWn supply channel.
[0065] Moreover, respective metering channel opening
19.1 of metering channel 19 of metering device 17 for con
trolled metered addition of ?uid 18 in at least one partial ?uid
stream 18.T (arroW) into ?brous stock suspension 2 is located
Moreover, ?oW channels 11 of turbulence generator
join at different heights and Which are allocated to ?oW chan
nels 11 of turbulence generator 10 arranged in this column 8.2
and 8.3 feature a column separation of metering channel
center lines TS.19.M.
in the range of approximately 1 to 50 mm, for example 3 to 30
[0073] In the illustration in FIG. 4, that is in the ?rst
arrangement the column separation of metering channel cen
mm, or 10 to 30 mm from turbulence generator 10. The
ter lines TS.19.M assumes the same value as the column
at a vertical and uniform or approximately uniform distanceA
metering channel opening of respective metering channel 19
separation of ?oW channels TS.11. Therefore, one roW of
of individual metering device 17 is also arranged parallel or
approximately parallel to inside 9.2.1 of upper and, for
example machine-Wide, Wall 9.2 of intermediate channel 8.
metering channels 19 of metering devices 17 respectively are
Obviously it can also be arranged in a non-illustrated manner
at an angle to the infeed side of the turbulence generator.
allocated to all roWs Z1, Z2 and Z.3 of ?oW channels 11 of
turbulence generator 10. The entire volume of ?brous stock
suspension is hereWith supplied With the ?uid in partial ?uid
streams.
Jul. 5, 2012
US 2012/0168105 A1
[0074] In the illustration in FIG. 5, that is the second
arrangement, the column separation of metering channel cen
ter lines TS.19.M assumes double the value of the column
separation of ?oW channels TS.11. Therefore, respectively
one roW of metering channels 19 of metering devices 17 are
allocated only to roWs Z1 and Z3 of ?oW channels 11 of
turbulence generator 10. Therefore, only 2/3 of the volume of
?brous stock suspension is supplied With the ?uid in partial
[0096]
[0097]
[0098]
[0099]
11 FloW channel
12 Machine-Wide chamber
13 Headbox noZZle
14 NoZZle gap
[0101]
[0102]
16 Reorientation
17 Metering devices for example for controlled
metered addition of a ?uid in partial ?uid streams
?uid streams.
[0103] 17.1 Metering pipe
[0075] Also, individual metering channel opening 19.1 of
[0104]
[0105]
metering channel 19 of metering device 17 in FIGS. 4 and 5
is aligned such that metering channel center line 19.M of
metering channel 19 impinges outside roW Z1, Z2 and Z3
(FIG. 4) or respectively Z1 and Z3 (FIG. 5) of adjacent ?oW
channels 11 onto turbulence generator 10 When forming
respective impingement point AP.
18 Fluid
18.T Partial ?uid stream (arroW)
[0106] 19 Metering channel
[0107] 19.1 Metering channel opening
[0108] 19.2 Metering component
[0109]
[0110]
[0111]
[0112]
19A Outside surface
19.D Diameter
19.I Cross sectional inside surface
19.M Metering channel center line
[0076] In a non-illustrated manner, the metering channel
center line of the metering channel may of course also
impinge on the turbulence generator inside the roW of the
[0113]
20 Supply channel
adjacent ?oW channels When forming an impingement point.
[0114]
A Distance
[0077] Fluid 18 used in the embodiments illustrated in
FIGS. 2, 3, 4 and 5 consists, for example, of Water, such as
[0115] AE.1 First alignment plane
[0116] AE.2 Second alignment plane
White Water or clari?ed Water or of at least one ?brous stock
[0117] AP Impingement point (cross)
suspension Whose concentration is different than the average
concentration of at least one ?brous stock suspension 2 (ar
[0118]
[0119]
[0120]
[0121]
[0122]
[0123]
[0124]
[0125]
[0126]
[0127]
roW) ?oWing through headbox 1.
[0078] Headbox 1 illustrated and described respectively in
FIGS. 2, 3, 4 and 5, is suitable for utiliZation in a machine for
the production of ?brous material Web 3, such as a paper or
cardboard Web from at least one ?brous stock suspension 2
(arroW).
[0079]
The properties of the embodiments of headbox 1
illustrated and described in FIGS. 2, 3, 4 and 5 can also be
combined, at least in part in a manner knoWn to the expert.
[0080] In summary it can be stated that the headbox accord
ing to the present invention provides a technically simple and
reliable dilution Water system. Moreover it permits a cost
effective design and provides a more favorable retro?t solu
tion With less doWntime.
[0081]
While this invention has been described With respect
to at least one embodiment, the present invention can be
further modi?ed Within the spirit and scope of this disclosure.
This application is therefore intended to cover any variations,
uses, or adaptations of the invention using its general prin
ciples. Further, this application is intended to cover such
departures from the present disclosure as come Within knoWn
or customary practice in the art to Which this invention per
tains and Which fall Within the limits of the appended claims.
COMPONENT IDENTIFICATION LIST
[0082]
1 Headbox
[0083] 2 Fibrous stock suspension (arroW)
[0084]
[0085]
[0086]
[0087]
2.1 Blended stream (arroW)
3 Fibrous Web
4 Feed device
5 Cross distribution pipe
[0088]
6 Perforated distribution pipe plate
[0089]
[0090]
[0091]
[0092]
[0093]
[0094]
[0095]
7 Channel
8 Intermediate channel
9.1 Wall; loWer Wall
9.2 Wall; upper Wall
921 Inside
10 Turbulence generator
10B Infeed side
B Width direction (arroW; double arroW)
K Circle
L Longitudinal direction
R FloW direction (arroW)
S; S.1 Column
S; S.2 Column
S; S.3 Column
S; S.4 Column
TS.11 Column separation of ?oW channels
TS.19.M Column separation of metering channel
center lines
[0128]
[0129]
TZ.11 RoW separation of ?oW channels
TZ.19.M RoW separation of metering channel cen
ter lines
[0130] Z; Z.1 RoW; loWer roW
[0131] Z; Z.2 RoW; upper roW
[0132] Z; Z.3 RoW; middle roW
[0133] 0t Angle
What is claimed is:
1. A headbox for a machine for producing a ?brous mate
rial Web from at least one ?brous stock suspension, the head
box comprising:
a feeding device for feeding the at least one ?brous stock
suspension;
a perforated distribution pipe plate arranged immediately
doWnstream from said feeding device in a ?oW direction
of the at least one ?brous stock suspension includes a
plurality of ?oW channels arranged in a plurality of roWs
and columns;
an intermediate channel arranged immediately doWn
stream from said perforated distribution pipe plate in
said ?oW direction of the at least one ?brous stock sus
pension extends in a Width direction of the headbox and
includes tWo Walls, said feeding device, said perforated
distribution pipe plate and said intermediate channel
being arranged in a ?rst alignment plane and said inter
mediate channel including a plurality of metering
devices for metered addition of a ?uid in a plurality of
partial ?uid streams into the at least one ?brous stock
suspension on at least one of said tWo Walls and spaced
apart from each other in said Width direction and a lon
Jul. 5, 2012
US 2012/0168105 A1
gitudinal direction of the headbox, each individual of
said plurality of metering devices including a metering
channel having a metering channel opening and a meter
ing channel center line, said metering channel opening
being aligned such that said metering channel center line
11. The headbox according to claim 10, Wherein said ?oW
channels of said turbulence generator arranged in one column
of said plurality of columns feature a column separation of
said ?oW channels and said metering channel center lines of
said metering channels of said metering devices join at dif
impinges on said turbulence generator to form an
ferent heights allocated to said ?oW channels of said turbu
impingement point;
lence generator located in said one column feature a column
a turbulence generator arranged immediately doWnstream
of said intermediate channel in said ?oW direction of the
at least one ?brous stock suspension has a plurality of
?oW channels arranged in a plurality of roWs and col
umns; and
a headbox noZZle arranged immediately doWnstream of
said turbulence generator in said ?oW direction of the at
least one ?brous stock suspension has a noZZle gap, said
turbulence generator and said headbox noZZle being
arranged in a second alignment plane, said ?rst align
ment plane and said second alignment plane forming an
angle in a range of approximately betWeen >90 and
<1 80°.
2. The headbox according to claim 1, Wherein the headbox
for producing the ?brous material Web is for producing one of
a paper, cardboard and a tissue Web.
separation of said metering channel center lines, said column
separation of said metering channel center lines assuming one
of the same and double a value of said column separation of
said ?oW channels of said turbulence generator.
12. The headbox according to claim 1, Wherein said ?oW
channels of said turbulence generator located in tWo adjacent
of said plurality of roWs are arranged offset relative to each
other.
13. The headbox according to claim 12, Wherein said ?oW
channels of said turbulence generator located in said tWo
adjacent of said plurality of roWs are arranged center-offset
relative to each other.
14. The headbox according to claim 1, Wherein all of said
metering channels of said plurality of metering devices are
connected With a common supply channel.
15. The headbox according to claim 13, Wherein each of
said metering channels of said individual metering devices is
3. The headbox according to claim 1, Wherein said tWo
Walls of said intermediate channel and the machine for pro
ducing the ?brous material Web have a Width Which is the
connected With its oWn supply channel.
16. The headbox according to claim 1, Wherein said meter
same.
ing channel opening of said metering channel of each of said
4. The headbox according to claim 1, Wherein said angle is
in a range of approximately between 2100 and §170°.
5. The headbox according to claim 4, Wherein said angle is
approximately uniform distance in a range of approximately
in a range of approximately between 2110 and §160°.
6. The headbox according to claim 1, Wherein saidplurality
of metering devices for addition of said ?uid in said plurality
of ?uid streams into the at least one ?brous stock suspension
are for controlled and metered addition of said ?uid.
7. The headbox according to claim 6, Wherein said meter
ing channel opening of said individual metering device is
aligned such that said metering channel center line impinges
approximately centered betWeen said plurality of columns of
individual metering devices is located at a vertical and at least
betWeen 1 to 50 mm from said turbulence generator.
17. The headbox according to claim 16, Wherein said dis
tance is in a range of approximately betWeen 10 to 30 mm
from said turbulence generator.
18. The headbox according to claim 17, Wherein said dis
tance is in a range of approximately betWeen 3 to 30 mm from
said turbulence generator.
19. The headbox according to claim 1, Wherein said meter
ing channel of said individual metering devices features at
least in part one of a constant and an intermittently enlarging
tWo adjacent of said plurality of ?oW channels onto said
cross sectional inside surface.
turbulence generator to form said impingement point.
20. The headbox according to claim 1, Wherein said indi
vidual metering devices include a metering pipe.
21. The headbox according to claim 20, Wherein said
metering channel of said individual metering devices has a
8. The headbox according to claim 7, Wherein said meter
ing channel opening of said individual metering device is
aligned such that said metering channel center line impinges
centered betWeen said plurality of columns of tWo adjacent of
said plurality of ?oW channels onto said turbulence generator
to form said impingement point.
9. The headbox according to claim 7, Wherein said ?oW
channels of said turbulence generator arranged in one of said
plurality of roWs feature a roW separation and said metering
channel center lines of said metering channels Which are
allocated to said ?oW channels of said turbulence generator
located in said one of said plurality of roWs feature a roW
rotationally symmetrical cross-sectional inside surface along
its respective metering channel center line.
22. The headbox according to claim 21, Wherein said
metering pipe of said individual metering devices has a rota
tionally symmetrical outside surface With a diameter in a
range of approximately betWeen 3 to 25 mm.
23. The headbox according to claim 22, Wherein said diam
eter is in a range of approximately betWeen 4 to 16 mm.
24. The headbox according to claim 23, Wherein said diam
separation of said metering channel center lines, said roW
separation of said metering channel center line assuming one
eter is in a range of approximately betWeen 5 to 10 mm.
of the same and double a value of said roW separation of said
consists of one of at least Water and at least one ?brous stock
?oW channels of said turbulence generator.
10. The headbox according to claim 9, Wherein said meter
suspension having a concentration different than an average
concentration of the at least one ?brous stock suspension
ing channel opening of said metering channel of said indi
vidual metering device is aligned such that said metering
?oWing through the headbox.
channel center line impinges one of outside and inside said
roW of adjacent ?oW channels of said turbulence generator
consisting of said Water is one of White Water and clari?ed
When forming said impingement point onto said turbulence
generator.
25. The headbox according to claim 1, Wherein said ?uid
26. The headbox according to claim 25, Wherein said ?uid
Water.
27. A machine for producing a ?brous material Web, the
machine comprising:
Jul. 5, 2012
US 2012/0168105 A1
a headbox comprising;
a feeding device for feeding the at least one ?brous stock
suspension;
a perforated distribution pipe plate arranged immediately
said plurality of metering devices including a metering
channel having a metering channel opening and a meter
ing channel center line, said metering channel opening
being aligned such that said metering channel center line
doWnstream from said feeding device in a How direction
impinges on said turbulence generator to form an
of the at least one ?brous stock suspension includes a
impingement point;
plurality of How channels arranged in a plurality of roWs
and columns;
an intermediate channel arranged immediately doWn
stream from said perforated distribution pipe plate in
said How direction of the at least one ?brous stock sus
pension extends in a Width direction of the headbox and
includes tWo Walls, said feeding device, said perforated
distribution pipe plate and said intermediate channel
being arranged in a ?rst alignment plane and said inter
mediate channel including a plurality of metering
devices for metered addition of a ?uid in a plurality of
partial ?uid streams into the at least one ?brous stock
suspension on at least one of said tWo Walls and spaced
apart from each other in said Width direction and a lon
gitudinal direction of the headbox, each individual of
a turbulence generator arranged immediately doWnstream
of said intermediate channel in said How direction of the
at least one ?brous stock suspension has a plurality of
How channels arranged in a plurality of roWs and col
umns; and
a headbox noZZle arranged immediately doWnstream of
said turbulence generator in said How direction of the at
least one ?brous stock suspension has a noZZle gap, said
turbulence generator and said headbox noZZle being
arranged in a second alignment plane, said ?rst align
ment plane and said second alignment plane forming an
angle in a range of approximately betWeen >90 and
<1 80°.
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