U.S. patent application number 11/943859 was filed with the patent office on 2008-05-22 for device for supporting a wire, felt or paper web in a paper production plant.
Invention is credited to Heinz Bartelmuss, Klaus Bartelmuss.
Application Number | 20080115901 11/943859 |
Document ID | / |
Family ID | 39415756 |
Filed Date | 2008-05-22 |
United States Patent
Application |
20080115901 |
Kind Code |
A1 |
Bartelmuss; Klaus ; et
al. |
May 22, 2008 |
Device for Supporting a Wire, Felt or Paper Web in a Paper
Production Plant
Abstract
A device for supporting a wire or felt in a paper production
plant or the paper web produced in the plant. The supporting device
includes at least one rotatably mounted supporting roll or the
like. The at least one supporting roll or the like is mounted in a
bearing shell and, on the side facing away from the wire, the felt
or the paper web, can have applied to it a medium capable of
flowing, specifically a liquid or a gas, by which means it is kept
at a distance from the bearing surface.
Inventors: |
Bartelmuss; Klaus;
(Teufenbach, AT) ; Bartelmuss; Heinz; (Teufenbach,
AT) |
Correspondence
Address: |
LERNER GREENBERG STEMER LLP
P O BOX 2480
HOLLYWOOD
FL
33022-2480
US
|
Family ID: |
39415756 |
Appl. No.: |
11/943859 |
Filed: |
November 21, 2007 |
Current U.S.
Class: |
162/289 |
Current CPC
Class: |
D21F 1/50 20130101; D21F
1/36 20130101; D21F 1/24 20130101 |
Class at
Publication: |
162/289 |
International
Class: |
D21G 1/02 20060101
D21G001/02 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 21, 2006 |
AT |
A 1924/2006 |
Mar 29, 2007 |
AT |
A 495/2007 |
Claims
1. A supporting device in a paper production plant, for supporting
a wire, a felt, or a paper web produced in the paper production
plant, the supporting device comprising: a bearing shell having a
bearing surface; at least one supporting roll rotatably mounted in
said bearing shell; said bearing shell being configured for
subjecting said supporting roll, on a side thereof facing away from
the wire, the felt, or the paper web, to a fluidic medium for
spacing said supporting roll a distance from said bearing
surface.
2. The device according to claim 1, wherein said fluidic medium is
a medium capable of flowing selected from the group consisting of a
liquid and a gas.
3. The device according to claim 1, wherein at least one channel
for supplying the fluidic medium opens into said bearing shell.
4. The device according to claim 3, wherein said at least one
channel is constructed with a nozzle-type narrowing.
5. The device according to claim 1, wherein said bearing shell is
formed with at least one opening through which the fluidic medium
flows, and said opening is formed with a widened region.
6. The device according to claim 5, wherein said widened region in
the bearing shell is a dome or a slot.
7. The device according to claim 1, which comprises a valve
disposed in at least one supply channel for the fluidic medium.
8. The device according to claim 7, wherein said valve is a check
valve.
9. The device according to claim 1, wherein said at least one
supporting roll is disposed to have a fluidic medium applied to end
faces thereof.
10. The device according to claim 1, which comprises a cover at
least partly embracing the supporting roll, and wherein said
supporting roll projects out of said cover in a position in which
the fluidic medium is applied to said supporting roll.
11. The device according to claim 10, wherein, as seen in an axial
direction, in each case a cover is provided on the two sides of
said at least one supporting roll.
12. The device according to claim 1, wherein said at least one
supporting roll is one of a plurality of supporting rolls,
supporting rollers, or supporting balls, mounted in at least one
said bearing shell and disposed beside one another.
13. The device according to claim 12, wherein said plurality of
supporting rolls, supporting rollers, or supporting balls are
disposed one after another in a direction of movement of the wire,
the felt, or the web of paper.
14. The device according to claim 12, wherein at least some of said
supporting rolls, supporting rollers, or supporting balls are
supported on a common carrier for said bearing shells.
15. The device according to claim 12, wherein at least one
supporting roll is provided on each side of the wire, the felt, or
the web of paper.
16. The device according to claim 12, which comprises a suction
device and one or more suction channels issuing at a location
between two said supporting rolls.
17. The device according to claim 15, wherein said supporting rolls
on opposite sides of the felt and extending transversely with
respect to the felt are offset in relation to one another in a
longitudinal direction of the felt, a respective said supporting
roll arranged on one side projecting into a space between two
respective supporting rolls arranged on the opposite side, to
define a wavy course of the felt between the mutually opposite
supporting rolls.
18. The device according to claim 17, which comprises a spraying
device disposed to spray the felt.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the priority, under 35 U.S.C. .sctn.
119, of Austrian applications A 1924/2006, filed Nov. 21, 2006 and
A 495/2007, filed Mar. 29, 2007; the prior applications are
herewith incorporated by reference in their entirety.
BACKGROUND OF THE INVENTION
Field of the Invention
[0002] The present invention relates to a device for supporting a
wire or felt in a paper production plant or the paper web produced
in the plant. The supporting device has a rotatably mounted
supporting roll or the like.
[0003] In paper production plants, there are at least one wire and
at least one felt adjoining the latter in the direction of
movement, the two being moved in the plants at high speeds. At the
start of its movement path, a paper stock is sprayed onto the wire.
Along the movement path of the wire, the liquid contained in the
paper stock is led away through the wire, in particular sucked
away. The web of paper produced as a result is then transferred to
the felt, on which it is dried. The paper web is then detached from
the felt and processed further, in particular dried further and
rolled.
[0004] Wires, felts and paper webs in such paper production plants
have widths of up to 12 m, which are moved along the plant at
speeds of about 30 m/sec.
[0005] The wires and felts located in the plants, and also the
paper webs, can be guided during their movement in the plant on
supporting rolls, which extend over the entire width of the plant
and which are mounted at their two ends. Because of the great
length of the supporting rolls and because of the fact that the
wires, felts or paper webs bear on these supporting rolls with high
pressure, the latter have to be formed with large diameters, which
necessitates high constructional expenditure. If, in addition,
suction devices are assigned to the wire or felt, supporting rolls
of this type cannot be used, however, since the interspace located
between them, by which the suction channel is delimited, is so
small in relation to that area which is subjected to the suction
action that, as a result, no suction action meeting the
requirements is achieved.
[0006] For this reason, it is not possible to support by means of
rolls of this type such regions of the wire or of the felt in which
suction devices are arranged.
[0007] In order to avoid the disadvantages adhering to the known
supporting rolls, in order to support the wires or the felts, it is
moreover known to provide supporting strips extending over the
width of these wires or felts, which are provided with a wearing
layer formed by plates of a ceramic material on their side assigned
to the wires or felts. Supporting strips of this type are
advantageous inasmuch as, with small dimensions, they exhibit high
strength or rigidity, since they can be arranged beside one another
at any desired small distances, since suction channels meeting the
requirements can be provided between them and since, additionally,
they also serve as wiping strips for the liquid reaching the
underside of the wire.
[0008] Wiping strips of this type are disadvantageous, however,
since they are very expensive to produce because of the formation
using plates of a ceramic material and since very high frictional
forces occur between them and the wires or felts resting on them.
As a result of these high frictional forces, firstly a high drive
output is required for the movement of the wires or the felts.
Secondly, because of these frictional forces, very high thermal
loadings and thermal stresses caused by these occur in the plates
of a ceramic material, as a result of which the latter can
fracture, whereupon they have to be replaced. In addition, both the
plates of a ceramic material and the wires and the felts moving
over these supporting strips are subjected to very high wear.
BRIEF SUMMARY OF THE INVENTION
[0009] It is accordingly an object of the invention to provide a
supporting device for a wire, a felt, or a web in a
paper-production facility which overcomes the above-mentioned
disadvantages of the heretofore-known devices and methods of this
general type and which provides for a device that supports at least
one wire, at least one felt, or the web of paper and which avoids
the disadvantages adhering to the prior art supporting roll.
[0010] With the foregoing and other objects in view there is
provided, in accordance with the invention, a supporting device in
a paper production plant, for supporting a wire, a felt, or a paper
web produced in the paper production plant. The supporting device
comprises:
[0011] a bearing shell having a bearing surface;
[0012] at least one supporting roll rotatably mounted in the
bearing shell;
[0013] the bearing shell being configured for subjecting the
supporting roll, on a side thereof facing away from the wire, the
felt, or the paper web, to a fluidic medium (i.e., a flowable
medium such as water or compressed air) for spacing said supporting
roll a distance from the bearing surface.
[0014] In other words, the objects of the invention are achieved in
that the at least one supporting roll or the like is mounted in a
bearing shell and, on the side facing away from the wire, felt or
the paper web, can have applied to it a medium capable of flowing,
specifically a liquid or a gas, by which means it is kept at a
distance from the bearing surface.
[0015] Preferably, at least one channel for the supply of the
medium capable of flowing opens into the bearing shell. In this
case, the at least one channel for the supply of the medium capable
of flowing can be constructed with a nozzle-like narrowing and the
at least one opening provided in the bearing shell for the medium
capable of flowing can be constructed with a widened region, in
particular with a dome or with a slot. In addition, a valve, in
particular a non-return or check valve, can be located in the at
least one supply channel for the medium.
[0016] According to a preferred embodiment, the at least one
supporting roll can also have a medium capable of flowing applied
to its end faces. Furthermore, the at least one supporting roll or
the like is at least partly embraced by a cover over which the at
least one supporting roll or the like projects in the position of
the latter in which medium is applied to it. In this case, as seen
in the axial direction, in each case a cover can also be provided
on both sides of the at least one supporting roll or the like.
[0017] According to a further preferred embodiment, a plurality of
supporting rolls, supporting rollers or supporting balls is
provided, which are mounted in at least one bearing shell and which
are located beside one another and possibly also one after another
in the direction of movement of the wire, of the felt or of the web
of paper. In this case, at least some of the supporting rolls,
supporting rollers, supporting balls or the like can be located on
a common carrier for the bearing shells.
[0018] According to a further preferred embodiment, supporting
rolls or the like can also be provided on both sides of the wire,
of the felt or of the web of paper, suction channels, which are
connected to a suction device, being located between two supporting
rolls or the like located beside each other.
[0019] In order to be able to perform very effective cleaning of a
felt, the rolls or the like which are located on both sides of the
felt and which extend transversely with respect to the felt are
furthermore preferably offset in relation to one another in the
longitudinal direction of the felt, a supporting roll or the like
arranged on one side projecting into the space found between two
supporting rolls or the like arranged on the other side, which
means that the felt is moved in a wavy course between the mutually
opposite supporting rolls or the like. In this case, a spraying
device is assigned to the felt.
[0020] Other features which are considered as characteristic for
the invention are set forth in the appended claims.
[0021] Although the invention is illustrated and described herein
as embodied in device for supporting a wire, felt or paper web in a
paper production plant, it is nevertheless not intended to be
limited to the details shown, since various modifications and
structural changes may be made therein without departing from the
spirit of the invention and within the scope and range of
equivalents of the claims.
[0022] The construction and method of operation of the invention,
however, together with additional objects and advantages thereof
will be best understood from the following description of specific
embodiments when read in connection with the accompanying
drawings.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
[0023] FIG. 1 is a sectional view of a first embodiment of a device
according to the invention in a first implementation, specifically
for supporting a wire;
[0024] FIG. 2 is a sectional view of a second embodiment of a
device according to the invention;
[0025] FIG. 3 is a sectional view of a second implementation of a
device according to the invention;
[0026] FIG. 4 is a side view of a third implementation of a device
according to the invention;
[0027] FIGS. 4A to 4D are side views showing four different further
embodiments of a device according to the invention; and
[0028] FIG. 5 is a front view of a fourth implementation of a
device according to the invention.
DETAILED DESCRIPTION OF THE INVENTION
[0029] Referring now to the figures of the drawing in detail and
first, particularly, to FIG. 1 thereof, there is shown a wire 1 in
a paper production plant, which is supported by a supporting roll
2. The supporting roll 2 is mounted in a bearing shell 3. The
bearing shell 3 is constructed with an approximately
semi-cylindrical bearing surface and with flat end faces at the
ends. In addition, the bearing shell 3 is constructed with three
channels or conduits 4 for the supply of a fluidic medium, i.e., a
flowable medium, such as water or compressed air. The channels open
in the bearing surface. In addition, the end faces are also
constructed with openings, to which a medium capable of flowing is
led. In this case, at their ends facing the openings 5, the supply
channels 4 are each constructed with a taper 6, by means of which
the entry of contaminants into the channels 4 is prevented. In
order to ensure a uniform feed flow of the medium to the supporting
roll 2, the openings 5 of the channels 4 are also in each case
constructed with a widening. By this means, the most uniform
loading of the supporting roll 2 over its entire region located in
the bearing shell 3 is achieved. In addition, check valves or
non-return valves are in each case provided in the supply
channels.
[0030] As a result of the application of a medium to the supporting
roll 2, the latter is raised in the bearing shell 3 in the
direction of the arrow A, by which means it is held at a distance
with respect to the bearing surface and also with respect to the
end faces, so that it can be rotated virtually without friction in
the bearing shell 3.
[0031] The supporting roll 2 can also be used in the same way as a
rest for a felt or for the web of paper produced in the plant.
[0032] Because of the fact that the supporting roll 2 is mounted in
the bearing shell 3 over its entire length, it can be constructed
with a relatively small diameter irrespective of its length without
its serviceability being reduced as a result. In this regard, it is
pointed out that the supporting roll 2 can extend over the entire
width of the wire 1, of the felt or of the web of paper, and that a
plurality of coaxial supporting rolls or other supporting elements
can be provided over the width of the wire, felt or web.
[0033] FIG. 2 illustrates a second embodiment of a device according
to the invention, in which the supporting roll 2 is constructed
with covers 7 arranged at the sides, which are bent over toward the
supporting roll 2 in the upper region, which means that lifting of
the supporting roll 2 beyond a predefined extent is limited. The
covers 7 are in this case fixed to the bearing shell 3 by means of
screws 8. Furthermore, the bearing shell 3 is fixed to a plate-like
carrier 10, which is pierced by the three supply channels 4 and in
whose lower region there is a recess 11, from which the three
supply channels 4 originate.
[0034] By using FIG. 3, the use of such a supporting roll 2 as a
breaker roll in a paper production plant will be explained. Breaker
rolls are used to align the web of paper 13 in a cross-cutter. In
this case, the web of paper 13 is led over a first deflection roll
14, then over the supporting roll 2 and also over a second
deflection roll 15. In order to be able to adjust the extent of the
bending of the web of paper 13, the carrier 10 can be displaced
vertically.
[0035] In FIG. 4, three supporting rolls 2 arranged beside one
another in the direction of movement of the wire 1 or the felt are
illustrated, between which there are suction channels 16. In this
case, the carriers 10 are fixed by means of screws 10a to a support
17, which is constructed with suction channels 16a connected to a
suction device. By means of this arrangement, a suction force can
be applied to the wire 1 or the felt between the supporting rolls
2.
[0036] Three further embodiments will be explained with reference
to FIGS. 4A to 4D:
[0037] In the embodiment illustrated in FIG. 4A, the supporting
roll 2 extends over the entire width of the paper production
plant.
[0038] In the embodiment illustrated in FIG. 4B, instead of a
single supporting roll, four coaxial supporting rolls 21 arranged
beside one another are provided, on which the wire or the felt
rests.
[0039] In the embodiment illustrated in FIG. 4C, the individual
supporting rolls 21a are crowned.
[0040] In the fourth embodiment, illustrated in FIG. 4D, instead of
supporting rolls arranged beside one another, a group of supporting
balls 21b arranged beside one another and possibly after one
another in the direction of movement are provided, which extend
over the width of the wire, felt or web carried by these.
[0041] The supporting rolls 21, the supporting rolls 21a and the
supporting balls 21b can be located beside one another and
additionally also one after another in the direction of movement of
the wire 1 or felt.
[0042] All the supporting elements are assigned side covers 7. The
arrangement of individual supporting rolls or the like located
beside one another is advantageous since, as a result, a suction
action can also be exerted on the wire or the felt between these
individual supporting elements.
[0043] A supporting device according to the invention is thus
advantageous since, for the movement of the at least one wire or
the at least one felt, it requires only low drive outputs, since
the wear of the supporting elements, on one hand, and of the wire
or the felt is low and since, between the supporting elements,
there is sufficient space for suction channels in order to be able
to apply to the wire or to the felt appropriate suction forces
meeting the requirements.
[0044] FIG. 5A illustrates a further development of the device
according to FIG. 4, in which, on both sides of a felt 1a, a
plurality of such suction rolls 2 is provided, between which there
are suction channels 16 connected to a suction device. In this
case, the supporting rolls 2 located on one side of the felt 1a in
each case are offset with respect to the supporting rolls 2 located
on the other side of the felt 1a in the longitudinal direction of
the felt 1a, and they project into the spaces between the
supporting rolls 2 provided on the other side of the felt 1a, which
means that the felt 1a is moved in a wavy course. The supporting
rolls 2 located on the two sides of the felt 1a can preferably be
displaced with respect to each other, which means that the wavy
course of the felt 1a can be adjusted.
[0045] For the cleaning of a felt 1a, a spray pipe 9 oriented
transversely with respect to the movement path of the felt 1a is
provided, by means of which a cleaning liquid 9a can be applied to
the felt 1a. By means of such an arrangement, very effective
cleaning of the felt 1a is achieved.
* * * * *