U.S. patent application number 09/899163 was filed with the patent office on 2002-05-23 for conditioning and/or cleaning device.
This patent application is currently assigned to Voith Paper Patent GmbH. Invention is credited to Augscheller, Thomas, Begemann, Ulrich, Kleiser, Georg, Kotitschke, Gerhard, Meschenmoser, Andreas, Neumann, Michael, Prinzing, Hans, Strempfl, Christoph, Zembrot, Anton.
Application Number | 20020060035 09/899163 |
Document ID | / |
Family ID | 26007010 |
Filed Date | 2002-05-23 |
United States Patent
Application |
20020060035 |
Kind Code |
A1 |
Begemann, Ulrich ; et
al. |
May 23, 2002 |
Conditioning and/or cleaning device
Abstract
Device for conditioning, cleaning, and/or keeping clean at least
one of a rotating roll and a circulating belt of a paper machine.
The device includes at least two doctors arranged behind one
another in a roll and/or belt travel direction and spaced at a
distance from one another. The at least two doctors are assigned to
the at least one of the rotating roll and the circulating belt.
Inventors: |
Begemann, Ulrich;
(Heidenheim, DE) ; Kotitschke, Gerhard;
(Steinheim, DE) ; Prinzing, Hans; (Heidenheim,
DE) ; Meschenmoser, Andreas; (Horgenzell, DE)
; Zembrot, Anton; (Aulendorf, DE) ; Augscheller,
Thomas; (Bachhagel, DE) ; Kleiser, Georg;
(Hejdenheim, DE) ; Strempfl, Christoph;
(Herbrechtingen, AU) ; Neumann, Michael;
(Heidenheim, DE) |
Correspondence
Address: |
GREENBLUM & BERNSTEIN, P.L.C.
1941 ROLAND CLARKE PLACE
RESTON
VA
20191
US
|
Assignee: |
Voith Paper Patent GmbH
Heidenheim
DE
|
Family ID: |
26007010 |
Appl. No.: |
09/899163 |
Filed: |
July 6, 2001 |
Current U.S.
Class: |
162/281 ;
162/352 |
Current CPC
Class: |
D21G 3/005 20130101;
D21G 3/00 20130101; D21F 1/32 20130101 |
Class at
Publication: |
162/281 ;
162/352 |
International
Class: |
D21F 001/54; D21G
003/04 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 11, 2000 |
DE |
200 13 887.1 |
Sep 12, 2000 |
DE |
100 44 907.7 |
Claims
What is claimed:
1. A device for conditioning, cleaning, and/or keeping clean at
least one of a rotating roll and a circulating belt of a paper
machine, comprising: at least two doctors arranged behind one
another in a roll and/or belt travel direction and spaced at a
distance from one another, wherein said at least two doctors are
assigned to the at least one of the rotating roll and the
circulating belt.
2. The device in accordance with claim 1, wherein said at least two
doctors are located before a take-on point at which at least one
felt is guided onto the at least one of the roll and the belt.
3. The device in accordance with claim 2, further comprising a
boundary layer doctor positioned adjacent said at least one felt
before the take-on point, wherein a rear doctor of said at least
two doctors, when viewed in the travel direction, is connected to
said boundary layer doctor.
4. The device in accordance with claim 3, further comprising a
low-pressure suction device arranged for suctioning a wedge-shaped
opening formed at least by the at least one of the roll and the
belt, said at least one felt, said rear doctor, and said boundary
layer doctor.
5. The device in accordance with claim 3, wherein a distance
between said boundary layer doctor and the take-on point is less
that approximately 500 mm.
6. The device in accordance with claim 5, wherein said distance is
less than about 400 mm.
7. The device in accordance with claim 5, wherein said distance is
less than approximately 300 mm.
8. The device in accordance with claim 1, further comprising: a
press arranged before the at least one of the roll and the belt;
and a low pressure suction device arranged for suctioning a space
between said press and the at least one of the roll and the
belt.
9. The device in accordance with claim 1, wherein the at least one
of the roll and the belt comprises a suction felt guidance
roll.
10. The device in accordance with claim 9, further comprising a
first press of a pressing section of a paper machine, wherein said
suction felt guidance roll is provided subsequently to said first
press.
11. The device in accordance with claim 10, wherein said first
press comprises a roll press.
12. The device in accordance with claim 10, wherein said first
press comprises an extended nip press.
13. The device in accordance with claim 10, further comprising a
spray guard positioned between said suction felt guidance roll and
said first press.
14. The device in accordance with claim 13, wherein said spray
guard is arranged to extend substantially across a width of the
machine.
15. The device in accordance with claim 1, further comprising at
least one cleaning device acting on a surface of the at least one
of the roll and the belt.
16. The device in accordance with claim 15, wherein said at least
one cleaning device is positioned between said at least two
doctors.
17. The device in accordance with claim 15, wherein said at least
one cleaning device comprises at least one jet cleaning or spray
device arranged to direct a pressurized medium at said surface.
18. The device in accordance with claim 17, wherein said
pressurized medium comprises a fluid or air.
19. The device in accordance with claim 18, wherein said fluid
comprises water.
20. The device in accordance with claim 15, wherein said at least
one cleaning device comprises a combined blowing or spraying device
and suction device.
21. The device in accordance with claim 15, wherein said at least
one cleaning device comprises at least one rotatable spray head
arranged to traverse crosswise to the travel direction and arranged
to rotate around an axis.
22. The device in accordance with claim 15, wherein said at least
one cleaning device emits a medium onto said surface under a
pressure that is greater than approximately 20 bar.
23. The device in accordance with claim 22, wherein said medium is
under pressure less than about 30 bar.
24. The device in accordance with claim 22, wherein said medium is
under pressure less than about 25 bar.
25. The device in accordance with claim 15, wherein said at least
one cleaning device comprises a spray head which is rotatable
around an axis, said spray head including at least one nozzle which
is inclined relative to said axis.
26. The device in accordance with claim 25, further comprising a
vapor suctioning device, wherein said spray head is assigned to
said vapor suctioning device.
27. The device in accordance with claim 15, further comprising a
housing which is open to the at least one of the roll and the belt,
wherein said at least one cleaning device is enclosed and/or
surrounded by said housing.
28. The device in accordance with claim 27, wherein said housing is
sealed off from said surface by said at least two doctors.
29. The device in accordance with claim 1, wherein the at least one
of the roll and the belt comprises a grooved and/or blind bored
surface, and is arranged to form a pressing nip, and said device
further comprises a unit for evening out an amount of water
supplied to said pressing nip.
30. The device in accordance with claim 29, wherein said evening
out unit comprises one of said at least two doctors.
31. The device in accordance with claim 30, wherein in the one
doctor is the first of the at least two doctors in the travel
direction.
32. The device in accordance with claim 29, wherein said evening
out unit comprises a blowing device for blowing out grooves and/or
blind bores in said surface with a pressurized medium.
33. The device in accordance with claim 32, wherein said
pressurized medium is pressurized air.
34. The device in accordance with claim 29, wherein said evening
out unit includes a suction device for suctioning water out of said
surface.
35. The device in accordance with claim 29, wherein said evening
out unit includes a combined blowing and suction device.
36. The device in accordance with claim 29, wherein said evening
out unit includes a device for applying a hydrodynamically produced
underpressure to said surface.
37. The device in accordance with claim 36, wherein said device for
applying hydrodynamically produced underpressure includes at least
one of said at least two doctors.
38. The device in accordance with claim 37, wherein said at least
one doctor comprises a foil doctor arranged diagonally.
39. The device in accordance with claim 1, wherein the at least one
of the roll and the belt comprises a grooved and/or blind bored
surface, and the device further comprises a unit for removing water
from said grooved and/or blind bored surface, thereby increasing a
dry content of a fibrous material web to be dewatered.
40. The device in accordance with claim 39, wherein the fibrous
material web comprises a paper or a cardboard web.
41. The device in accordance with claim 39, wherein said water
removal unit includes a blowing device for blowing out grooves
and/or blind bores of said surface with a pressurized medium.
42. The device in accordance with claim 41, wherein said
pressurized medium comprises pressurized air.
43. The device in accordance with claim 39, wherein said water
removal unit includes a suction device for suctioning water out of
said surface.
44. The device in accordance with claim 39, wherein said water
removal unit includes a combined blowing and suction device.
45. The device in accordance with claim 39, wherein said water
removal unit includes a device for applying a hydrodynamically
produced underpressure to said surface.
46. The device in accordance with claim 45, wherein said device for
applying hydrodynamically produced underpressure includes at least
one of said at least two doctors.
47. The device in accordance with claim 46, wherein said at least
one doctor comprises a foil doctor arranged diagonally.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application claims priority under 35 U.S.C.
.sctn.119 of German Patent Application No. 200 13 887.1, filed on
Aug. 11, 2001 and German Patent Application No. 100 44 907.7, filed
on Sept. 12, 2001, the disclosures of which are expressly
incorporated by reference herein in their entireties.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention relates to a device for conditioning, cleaning
and/or keeping clean a rotating roll and/or a circulating belt of a
paper machine. Such a device is disclosed, for example, in DE-A-198
10 800.
[0004] 2. Discussion of Background Information
[0005] The press sections of high-speed paper machines require a
relatively high expense in terms of conditioning and cleaning rolls
and/or circulating belts, including felts, in order to produce
stable, good moisture cross profiles. Currently, attention in this
field is primarily focused on conditioning felts and suction rolls.
While it is possible to achieve satisfactory results with devices
of the type mentioned at the outset under normal operating
conditions, stable operation is not ensured under difficult
operating conditions.
[0006] One problem that arises with the conventional paper machines
is that a very strong lateral blowing of air and water occurs
between the pressing stack of the first press, namely a roller
press, and the subsequent suction felt guidance roll, which serves
to separate the felt.
[0007] Conventionally, high-pressure (HP) spray bars are provided
on the grooved and/or blind bored rolls and suction roll jackets
(see, for example, DE-A-198 10 800). Among other disadvantages,
these bars have the disadvantage of an insufficient cleaning
effect, a high water consumption, and causing a pronounced spraying
mist.
SUMMARY OF THE INVENTION
[0008] The present invention provides a device of the type
mentioned at the outset in which the above-mentioned disadvantages
are removed and the cleanliness of the rotating roll is
maintained.
[0009] According to the instant invention, at least two doctors
arranged behind one another and at a distance from one another in
the roll and/or belt travel direction are assigned to the rotating
rolls and/or the circulating belt.
[0010] In this manner, an underpressure is hydrodynamically
produced by a respective doctor. The corresponding hydrodynamic
effects particularly occur due to the fact that the respective
doctor is arranged in a diagonal position. While the front doctor
in the roll or belt travel direction scrapes water off of the roll
or belt surface, which is at least essentially open, i.e., in
particular, grooved or blind bored, air is scraped off by the
doctor arranged to the rear in the travel direction. Thus, the air
intake into a subsequent wedge-shaped opening is minimized
correspondingly. Such a wedge-shaped opening can, for example,
result from the fact that the doctor is arranged in the roll or
belt travel direction before a point where at least one felt
approaches the roll and/or the belt.
[0011] If the doctors are arranged in the roll and/or belt travel
direction before such a point at which at least one felt approaches
the roll and/or the belt, it is advantageous if the doctor that is
arranged in the rear when viewed in the roll and/or belt travel
direction is connected at least essentially across the width of the
machine to a boundary layer doctor arranged before the approach
point of the felt and provided on the felt. Among other things,
this prevents the air/water mixture carried along by the surface of
the felt from arriving in the wedge-shaped opening and damaging the
cleanliness of the roll surface again.
[0012] A low-pressure suction can be provided for suctioning the
space between a press preceding one of the rotating rolls and the
rotating roll.
[0013] In a useful embodiment, a low-pressure suction can be
provided for suctioning the wedge-shaped opening that is formed at
least by the rotating roll, the felt approaching this roll, the
rear doctor viewed in the roll and/or belt travel direction, and
the boundary layer doctor provided on the felt.
[0014] It is useful for the distance between the boundary layer
doctor and the felt approach point to be less than 500 mm, in
particular less than 400 mm, and preferably less than 300 mm.
[0015] In a useful practical embodiment, the doctors are assigned
to a suction felt guidance roll. This roll can, in particular, be
provided subsequently to the first pressing section of the paper
machine. This first press of the pressing section can be, for
example, a roll press, or also a wide nip and shoe press.
[0016] A spray guard can be provided between the suction felt roll
having the doctors and the first press.
[0017] In a preferred practical embodiment of the device according
to the invention, at least one cleaning device impinging the
surface of the roll and/or the belt is provided in the roll and/or
belt travel direction between the doctors. Here, at least one jet
cleaning or spraying device can be provided for the purpose of
impinging the surface of the roll and/or belt with a pressurized
medium. This pressurized medium can, for example, be a liquid, in
particular, water, or air.
[0018] In certain cases, it can be advantageous for the cleaning
device to include a combined blowing or spraying and suction
device.
[0019] In a useful practical embodiment, the cleaning device
includes at least one spray head rotating around its axis and
traversing crosswise to the roll and/or belt travel direction for
the purpose of impinging the roll and/or belt surface with a
pressurized medium. Thus, a highly effective cleaning is achieved
with a minimal use of the pressurized medium.
[0020] The medium impinging the roll and belt surface is preferably
under a pressure greater than approximately 20 bar and preferably
less than about 25 to 30 bar.
[0021] The spray head preferably includes at least one nozzle
tilted towards its axis. A vapor suction device, for example, can
be assigned to the spray head.
[0022] It is useful for the cleaning device to be enclosed and/or
surrounded by a housing that is open towards the roll and/or belt
surface. Here, the enclosure or the housing can be sealed off from
the roll and/or belt surface by way of the doctor.
[0023] In a preferable embodiment of the device according to the
invention that especially facilitates conditioning, a unit is
provided for evening out the amount of water supplied to a pressing
nip in a grooved or blind bored roll surface or belt surface.
[0024] It is also advantageous to provide a unit for removing water
from a grooved and/or blind bored roll or wall surface for the
purpose of increasing the dry content of the fibrous material web,
in particular paper or cardboard web, to be dewatered. This unit
can also only have the purpose of conditioning, for example.
[0025] With the conditioning of a respective grooved and/or blind
bored roll or belt surface specified above, the condition is taken
into account, among others, that even small differences in the
degree of fullness of the bores and/or grooves have an effect on
the moisture cross profile of the fibrous material web.
[0026] The evening and/or water removal unit preferably include a
device for blowing out the grooves and/or blind bores with a
pressurized medium, in particular pressurized air.
[0027] The evening and/or water removal unit can include a suction
device for suctioning water out of the surface of the roll or
belt.
[0028] In a useful practical embodiment, a combined blowing and
suction device is provided.
[0029] The evening and/or water removal unit preferably includes a
device for applying a hydrodynamically produced underpressure on
the surface of the roll or belt. Here, this device for producing
underpressure can, in particular, include at least one diagonally
arranged doctor, preferably at least one foil doctor.
[0030] The present invention is directed to a device for
conditioning, cleaning, and/or keeping clean at least one of a
rotating roll and a circulating belt of a paper machine. The device
includes at least two doctors arranged behind one another in a roll
and/or belt travel direction and spaced at a distance from one
another. The at least two doctors are assigned to the at least one
of the rotating roll and the circulating belt.
[0031] In accordance with a feature of the instant invention, the
at least two doctors can be located before a take-on point at which
at least one felt is guided onto the at least one of the roll and
the belt. Further, a boundary layer doctor may be positioned
adjacent the at least one felt before the take-on point. A rear
doctor of the at least two doctors, when viewed in the travel
direction, can be connected to the boundary layer doctor. Further,
a low-pressure suction device may be arranged for suctioning a
wedge-shaped opening formed at least by the at least one of the
roll and the belt, the at least one felt, the rear doctor, and the
boundary layer doctor. A distance between the boundary layer doctor
and the take-on point can be less that approximately 500 mm,
preferably, the distance is less than about 400 mm, and most
preferably, the distance is less than approximately 300 mm.
[0032] According to another feature of the instant invention, a
press may be arranged before the at least one of the roll and the
belt, and a low pressure suction device may be arranged for
suctioning a space between the press and the at least one of the
roll and the belt.
[0033] Further, the at least one of the roll and the belt can
include a suction felt guidance roll. A first press of a pressing
section of a paper machine can be provided, such that the suction
felt guidance roll is provided subsequently to the first press.
Further, the first press may include a roll press. Additionally, or
alternatively, the first press may include an extended nip press. A
spray guard can be positioned between the suction felt guidance
roll and the first press. The spray guard may be arranged to extend
substantially across a width of the machine.
[0034] Moreover, at least one cleaning device can act on a surface
of the at least one of the roll and the belt. The at least one
cleaning device may be positioned between the at least two doctors.
Further, the at least one cleaning device can include at least one
jet cleaning or spray device arranged to direct a pressurized
medium at the surface. The pressurized medium can include a fluid
or air, and the fluid may include water. The at least one cleaning
device can include a combined blowing or spraying device and
suction device. Further, the at least one cleaning device can
include at least one rotatable spray head arranged to traverse
crosswise to the travel direction and arranged to rotate around an
axis. The at least one cleaning device can emit a medium onto the
surface under a pressure that is greater than approximately 20 bar.
Further, the medium can be under pressure less than about 30 bar,
and further, the medium can be under pressure less than about 25
bar. The at least one cleaning device may include a spray head
which is rotatable around an axis, and the spray head may include
at least one nozzle which is inclined relative to the axis.
Further, a vapor suctioning device can be provided, such that the
spray head is assigned to the vapor suctioning device. Still
further, a housing can be provided which is open to the at least
one of the roll and the belt. The at least one cleaning device can
be enclosed and/or surrounded by the housing. The housing may be
sealed off from the surface by the at least two doctors.
[0035] According to still another feature of the instant invention,
the at least one of the roll and the belt can include a grooved
and/or blind bored surface, and may be arranged to form a pressing
nip. The device can further include a unit for evening out an
amount of water supplied to the pressing nip. The evening out unit
may include one of the at least two doctors, and the one doctor can
be the first of the at least two doctors in the travel direction.
The evening out unit may include a blowing device for blowing out
grooves and/or blind bores in the surface with a pressurized
medium. Further, the pressurized medium can be pressurized air. The
evening out unit may include a suction device for suctioning water
out of the surface. Still further, the evening out unit can include
a combined blowing and suction device. The evening out unit may
include a device for applying a hydrodynamically produced
underpressure to the surface. The device for applying
hydrodynamically produced underpressure can include at least one of
the at least two doctors, and the at least one doctor can include a
foil doctor arranged diagonally.
[0036] In accordance with yet another feature of the present
invention, the at least one of the roll-and the belt can include a
grooved and/or blind bored surface, and the device can further
include a unit for removing water from the grooved and/or blind
bored surface, thereby increasing a dry content of a fibrous
material web to be dewatered, which can include a paper or a
cardboard web. The water removal unit may include a blowing device
for blowing out grooves and/or blind bores of the surface with a
pressurized medium, in which the pressurized medium can include
pressurized air. The water removal unit may include a suction
device for suctioning water out of the surface. Further, the water
removal unit can include a combined blowing and suction device.
Still further, the water removal unit may include a device for
applying a hydrodynamically produced underpressure to the surface.
The device for applying hydrodynamically produced underpressure can
include at least one of the at least two doctors. The at least one
doctor can include a foil doctor arranged diagonally.
[0037] Other exemplary embodiments and advantages of the present
invention may be ascertained by reviewing the present disclosure
and the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
[0038] The present invention is further described in the detailed
description which follows, in reference to the noted plurality of
drawings by way of non-limiting examples of exemplary embodiments
of the present invention, in which like reference numerals
represent similar parts throughout the several views of the
drawings, and wherein:
[0039] FIG. 1 schematically illustrates a device for conditioning,
cleaning, and/or keeping clean assigned to a felt suction roll;
[0040] FIG. 2 schematically illustrates a device for conditioning,
cleaning, and/or keeping clean assigned to the lower roll of a shoe
press; and
[0041] FIG. 3 schematically illustrates a partial view of the
traversing, rotating spray head of the device depicted in FIG.
2.
[0042] DETAILED DESCRIPTION OF THE PRESENT INVENTION
[0043] The particulars shown herein are by way of example and for
purposes of illustrative discussion of the embodiments of the
present invention only and are presented in the cause of providing
what is believed to be the most useful and readily understood
description of the principles and conceptual aspects of the present
invention. In this regard, no attempt is made to show structural
details of the present invention in more detail than is necessary
for the fundamental understanding of the present invention, the
description taken with the drawings making apparent to those
skilled in the art how the several forms of the present invention
may be embodied in practice.
[0044] FIGS. 1 to 3 show various embodiments of a device 10 for
conditioning, cleaning, or keeping clean a rotating roll 12 and 14
of the pressing section of a paper machine.
[0045] Here, two doctors 16, 18 embodied as foil doctors and
arranged behind one another in the roll travel direction L at a
distance from one another are assigned to each rotating roll 12 and
14 in question.
[0046] In the embodiment according to FIG. 1, the two doctors 16,
18 are assigned to a suctioned felt roll 12 that is provided
subsequently to the first press 20 of the pressing section of the
paper machine. In the present case, this first press 20 is a roll
press. However, it can also be formed by an extended nip press.
[0047] As can be seen in FIG. 1, the doctors 16, 18 are arranged in
the roll travel direction L before a point 22 at which at least one
felt 24 approaches the felt suction roll 12.
[0048] In particular, the doctor 16 can be a water stripping edge.
It can be pressable against the roll. The doctor 18 can be an air
stripping edge in particular.
[0049] The rear doctor 18 viewed in the roll travel direction L is
connected to a boundary layer doctor 26 arranged before the felt
approach point 22 and provided on the felt 24.
[0050] A seating part 30 can be seen between the suctioned felt
guidance roll 12 having the doctors 16, 18 and the lower roll 28 of
the first press 20.
[0051] It is advantageous for the distance a between the boundary
layer doctor 26 and the felt approach point 22 to be less than
approximately 500 mm, in particular less than approximately 400 mm,
and preferably less than approximately 300 mm.
[0052] Moreover, a low-pressure suction 78 is provided for
suctioning off the space between the press 20 and the rotating roll
12. It can, for example, be provided for suctioning off this entire
space.
[0053] However, a low-pressure suction 78 is also conceivable for
suctioning off only the wedge-shaped opening that is formed by at
least the rotating roll 12, the felt 24 approaching this roll, the
rear doctor 18 viewed in the roll and/or belt travel direction L,
and the boundary layer doctor 26 provided on the felt 24.
[0054] According to FIG. 1, two water stripping edges 32 are
assigned to the lower roll 28 of the press 20. In principle, such
edges can be provided singularly or in a plurality.
[0055] In the embodiment shown in FIG. 2, the device 10 of the
lower opposing roll 14 is assigned to a shoe press 48 provided with
an upper shoe press unit, here an upper shoe press roll 46.
[0056] The two doctors 16, 18 are arranged on the outer
circumference of the grooved and/or blind bored opposing roll 14 at
a distance from one another.
[0057] A cleaning device 50 impinging the roll surface is provided
in the roll travel direction L between the two doctors 16, 18.
Here, for example, a jet cleaning or spraying device can be
provided for the purpose of impinging the roll surface with a
pressurized medium. A fluid, in particular water, or air can be
provided as the pressurized medium. A combined blowing or spray and
suction device is also conceivable, for example.
[0058] In the present case, the cleaning device 50 includes at
least one spray head 54 traversing crosswise to the roll travel
direction L and rotating around its axis 52 (see also FIG. 3) for
impinging the roll surface with the respective pressurized medium.
For example, this medium for impinging the roll surface can be
under a pressure that is greater than approximately 20 bar and
preferably less than about 25 to 30 bar.
[0059] The spray head 54 includes at least one, in the present case
at least two, nozzles 56 inclined to its axis 52. Correspondingly,
the nozzle jets 58 are inclined with respect to the axis 52 (see
FIG. 3). If the spray head 54 is rotating in the direction of the
arrow F, the nozzle jets 58 impact the grooved and/or blind bored
roll surface 60 in alternating directions.
[0060] The front doctor 18 in the roll travel direction L empties
the grooves 62 and/or blind bores of the roll surface 60, whereupon
the use of the nozzle jets 58 becomes more effective.
[0061] According to FIG. 3, the spraying head 54 can be assigned to
a vapor suction device 64.
[0062] As can be seen from FIG. 2, the cleaning device 50 can be
enclosed and/or surrounded by a housing 66 that is open to the roll
surface 60. Here, the housing 66 is sealed off from the roll
surface 60 by way of the doctors 16, 18.
[0063] In the present exemplary embodiment, the rear wall 68 of the
housing 66 in the roll travel direction L can be formed by a rubber
blanket, for example. This rubber blanket can be provided in the
region of an opening 72 leading to a groove 70 or the like. The
lower boundary 74 of the enclosure 66 can be defined by the groove
70.
[0064] Fundamentally, the grooved and/or blind bored surface 60 can
also be provided on a continuous belt.
[0065] In particular, the device 10 shown in FIGS. 2 and 3 can also
be provided solely as a conditioning device in which, for example,
the above-described doctors 16, 18 and cleaning device 50 are used
for the purpose of evening out the amount of water supplied to the
pressing nip 76 in the grooved and/or blind bored roll surface 60
and/or to remove water from the grooved and/or blind bored roll
surface 60 for the purpose of increasing the dry content of the
fibrous material web, here a paper or cardboard web, to be
dewatered.
[0066] Here, the device 50 including the spray head 54 can, for
example, be provided for blowing the grooves and/or blind bores 62
(see also FIG. 3) with a pressurized medium, in particular
pressurized air.
[0067] Fundamentally, the devices for evening out and/or removing
water can also include a combined blowing and suction device.
[0068] Finally, the devices for evening out and/or removing water
can, in particular, also be provided with a device for applying a
hydrodynamically produced underpressure to the roll surface 60. In
the present exemplary embodiment, this underpressure producing
device includes, for example, the doctor formed by a diagonally
arranged doctor 18.
[0069] It is noted that the foregoing examples have been provided
merely for the purpose of explanation and are in no way to be
construed as limiting of the present invention. While the present
invention has been described with reference to an exemplary
embodiment, it is understood that the words which have been used
herein are words of description and illustration, rather than words
of limitation. Changes may be made, within the purview of the
appended claims, as presently stated and as amended, without
departing from the scope and spirit of the present invention in its
aspects. Although the present invention has been described herein
with reference to particular means, materials and embodiments, the
present invention is not intended to be limited to the particulars
disclosed herein; rather, the present invention extends to all
functionally equivalent structures, methods and uses, such as are
within the scope of the appended claims.
LIST OF REFERENCE CHARACTERS
[0070] 10 Device for conditioning, cleaning, and/or keeping
clean
[0071] 12 Felt suction roll
[0072] 14 Opposing roll
[0073] 16 Doctor
[0074] 18 Doctor
[0075] 20 First press
[0076] 22 Felt approach point
[0077] 24 Felt
[0078] 26 Boundary layer doctor
[0079] 28 Lower roll
[0080] 30 Seating stand with a spray guard running the width of the
machine
[0081] 32 Water stripping edges
[0082] 34 Support plate
[0083] 36 Region
[0084] 38 Tube, rod
[0085] 40 Tube, rod
[0086] 42 Rubber covering
[0087] 44 Frame
[0088] 46 Shoe press unit
[0089] 48 Shoe press
[0090] 50 Cleaning device, water removal device
[0091] 52 Axis
[0092] 54 Spray head
[0093] 56 Nozzle
[0094] 58 Nozzle jet
[0095] 60 Roll and/or belt surface
[0096] 62 Groove, blind bore
[0097] 64 Vapor suctioning device
[0098] 66 Housing, enclosure
[0099] 68 Rear wall, rubber blanket
[0100] 70 Groove
[0101] 72 Opening
[0102] 74 Lower boundary
[0103] 76 Pressing nip
[0104] 78 Low-pressure suction
[0105] F Arrow
[0106] L Roll and/or belt travel direction
[0107] ML Machine operating direction
[0108] a Distance
* * * * *