CA2405374A1 - Cleaning a semipermeable membrane in a papermaking machine - Google Patents
Cleaning a semipermeable membrane in a papermaking machine Download PDFInfo
- Publication number
- CA2405374A1 CA2405374A1 CA002405374A CA2405374A CA2405374A1 CA 2405374 A1 CA2405374 A1 CA 2405374A1 CA 002405374 A CA002405374 A CA 002405374A CA 2405374 A CA2405374 A CA 2405374A CA 2405374 A1 CA2405374 A1 CA 2405374A1
- Authority
- CA
- Canada
- Prior art keywords
- semipermeable membrane
- cleaning fluid
- press
- air
- cleaning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 111
- 239000012528 membrane Substances 0.000 title claims abstract description 104
- 239000012530 fluid Substances 0.000 claims abstract description 81
- 238000000034 method Methods 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 claims abstract description 9
- 238000011010 flushing procedure Methods 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000003599 detergent Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 125000002091 cationic group Chemical group 0.000 claims description 3
- 239000000344 soap Substances 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 239000011877 solvent mixture Substances 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims 2
- 239000004744 fabric Substances 0.000 description 21
- 230000035699 permeability Effects 0.000 description 11
- 230000037361 pathway Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
- D21F3/0254—Cluster presses, i.e. presses comprising a press chamber defined by at least three rollers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/32—Washing wire-cloths or felts
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0272—Wet presses in combination with suction or blowing devices
Abstract
A method of cleaning a semipermeable membrane, the semipermeable membrane being configured for carrying a fiber web, includes the steps of providing a cleaning fluid and applying the cleaning fluid on the semipermeable membrane. Further, an air press configured for carrying the semipermeable membrane therethrough is provided, and the air press has pressurized air therein. The semipermeable membrane is conveyed through the air press and is subjected to the pressurized air within the air press. The pressurized air thereby flushes the cleaning fluid through the semipermeable membrane.
Description
CLEANING A SEiVIIPER1VIEABLE VIE1~~IBRANE IN A PAPERMAKING MACHINE
BACKGROUND OF THE INVENTION
1. Field of the invention.
The present invention relates to the cleaning of fabrics used in papermaking, and, more particularly, to cleaning fabrics with a low air permeability (i.e., semipermeable membranes).
BACKGROUND OF THE INVENTION
1. Field of the invention.
The present invention relates to the cleaning of fabrics used in papermaking, and, more particularly, to cleaning fabrics with a low air permeability (i.e., semipermeable membranes).
2. Description of the related art.
The need to clean fabrics of papermaking machines is well known. Since the flow of air and/or water through such fabrics is relied upon during the paper forming process, it is desirable that a maximum number of the fluid pathways available in such fabrics remain open. However, during transport of a paper web using such fabrics, various debris that is a by-product of the papermakina process can and does manage to get caught within the fluid pathways of such fabrics. This ongoing collection of debris in a fabric can reduce fluid flow rates therethrou~h to unacceptable levels and, if collecting near the surface of the fabric, can directly affect the surface quality of the paper being produced. Consequently, the need to effectively clean such fabrics exists.
A variety of methods and devices have already been developed for cleaning fabrics of papermaking machines. It has been disclosed to use different kinds of brushes, air jets and ultrasound spray bars. A rotatable needle jet has also been employed for cleaning fabrics. It has ?0 further been suggested to use water spray devices in combination with blowing air to clean a forming wire or screen.
However, these solutions have all been found suitable for cleaning forming wires, press belts and drying fabrics with a hi';h air permeability. These solutions have not been found effective for cleanin' low air permeability (i.e., semipermeable) fabrics. In fabrics with high air 2~ permeability, the fluid pathways tend to be both numerous and relatively lame. As such, debris vc>t~>?«~ us can be dislodged relatively easily From most such pathways, and there are enough fluid pathways available that it may not always be critical to achieve a hi'h degree of cleanliness for the fabric to operate sufficiently.
However, in semipermeable fabrics, in order to obtain the desired low air permeability therethrough, the number of fluid pathways tend to be limited and/or relatively small, in comparison to high air permeability fabrics. Thus, removal of debris from pathways of semipermeabIe membranes tends to be much more difficult to achieve, and the margin for error in the number of pathways that can remain blocked and still maintain an acceptable permeability level is much smaller than it is for high air permeability fabrics.
What is needed in the art is an effective method and apparatus for cleaning semipermeable fabrics used in papermaking machines. Specifically, the method and apparatus needs to be vigorous enouUh to remove a high percentage of debris from a set of openings from which the removal thereof tends to be difficult.
SL'MVIARY OF THE L~1VENTION
1 ~ The present invention provides a method and apparatus for cleaning a semipermeable membrane in which a cleaning fluid is applied thereto and then flushed therethrough using an air press to thereby clean the semipermeable membrane.
The invention comprises, in one form thereof, an apparatus for cleaning a semipermeable membrane, the semipermeable membrane being configured for carrying a fiber web. The ?0 apparatus includes a source of a cleaning fluid and an applicator configured for applying the cleaninU fluid to the semipermeable membrane. The apparatus also includes an air press configured for carnin;; the semipermeable membrane therethrough. The air press having pressurized air therein is thereby confi~,_>ured for flushing the cleaning fluid through the semipermeable membrane.
vOtO2o7.I,'S
The invention comprises, in another form thereof, a method of cleaning a semipermeable membrane, the semipermeable membrane bein'; configured for carrying a fiber web. The method includes the steps of providing a cleaning fluid and applying the cleaning fluid on the semipermeable membrane. Further, an air press confi;ured for carrying the semipermeable membrane therethrough is provided, and the air press has pressurized air therein. The semipermeable membrane is conveyed through the air press and is subjected to the pressurized air within the air press. The pressurized air thereby flushes the cleaning fluid through the semipermeable membrane.
An advantage of the present invention is that it provides an effective way of cleaning a semipermeable membrane having a low air permeability.
Another advantage is that it provides an effective wav of cleaning a semipermeable membrane without disturbing paper quality Yet another advantage is that the cleaning press of the present invention can be combined with an air press used for dewatering and/or can be used for impregnating/coating the paper web.
1 ~ BRIEF DESCRIPTION OF THE DRAWINGS
The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:
?0 Fig. 1 is a side view of a first embodiment of a papermaking machine including an apparatus for cleaning a semipermeable membrane;
Fiv. 2 is a side view of a second embodiment of a papermaking machine including an apparatus for cleanin<, a semipermeable membrane;
The need to clean fabrics of papermaking machines is well known. Since the flow of air and/or water through such fabrics is relied upon during the paper forming process, it is desirable that a maximum number of the fluid pathways available in such fabrics remain open. However, during transport of a paper web using such fabrics, various debris that is a by-product of the papermakina process can and does manage to get caught within the fluid pathways of such fabrics. This ongoing collection of debris in a fabric can reduce fluid flow rates therethrou~h to unacceptable levels and, if collecting near the surface of the fabric, can directly affect the surface quality of the paper being produced. Consequently, the need to effectively clean such fabrics exists.
A variety of methods and devices have already been developed for cleaning fabrics of papermaking machines. It has been disclosed to use different kinds of brushes, air jets and ultrasound spray bars. A rotatable needle jet has also been employed for cleaning fabrics. It has ?0 further been suggested to use water spray devices in combination with blowing air to clean a forming wire or screen.
However, these solutions have all been found suitable for cleaning forming wires, press belts and drying fabrics with a hi';h air permeability. These solutions have not been found effective for cleanin' low air permeability (i.e., semipermeable) fabrics. In fabrics with high air 2~ permeability, the fluid pathways tend to be both numerous and relatively lame. As such, debris vc>t~>?«~ us can be dislodged relatively easily From most such pathways, and there are enough fluid pathways available that it may not always be critical to achieve a hi'h degree of cleanliness for the fabric to operate sufficiently.
However, in semipermeable fabrics, in order to obtain the desired low air permeability therethrough, the number of fluid pathways tend to be limited and/or relatively small, in comparison to high air permeability fabrics. Thus, removal of debris from pathways of semipermeabIe membranes tends to be much more difficult to achieve, and the margin for error in the number of pathways that can remain blocked and still maintain an acceptable permeability level is much smaller than it is for high air permeability fabrics.
What is needed in the art is an effective method and apparatus for cleaning semipermeable fabrics used in papermaking machines. Specifically, the method and apparatus needs to be vigorous enouUh to remove a high percentage of debris from a set of openings from which the removal thereof tends to be difficult.
SL'MVIARY OF THE L~1VENTION
1 ~ The present invention provides a method and apparatus for cleaning a semipermeable membrane in which a cleaning fluid is applied thereto and then flushed therethrough using an air press to thereby clean the semipermeable membrane.
The invention comprises, in one form thereof, an apparatus for cleaning a semipermeable membrane, the semipermeable membrane being configured for carrying a fiber web. The ?0 apparatus includes a source of a cleaning fluid and an applicator configured for applying the cleaninU fluid to the semipermeable membrane. The apparatus also includes an air press configured for carnin;; the semipermeable membrane therethrough. The air press having pressurized air therein is thereby confi~,_>ured for flushing the cleaning fluid through the semipermeable membrane.
vOtO2o7.I,'S
The invention comprises, in another form thereof, a method of cleaning a semipermeable membrane, the semipermeable membrane bein'; configured for carrying a fiber web. The method includes the steps of providing a cleaning fluid and applying the cleaning fluid on the semipermeable membrane. Further, an air press confi;ured for carrying the semipermeable membrane therethrough is provided, and the air press has pressurized air therein. The semipermeable membrane is conveyed through the air press and is subjected to the pressurized air within the air press. The pressurized air thereby flushes the cleaning fluid through the semipermeable membrane.
An advantage of the present invention is that it provides an effective way of cleaning a semipermeable membrane having a low air permeability.
Another advantage is that it provides an effective wav of cleaning a semipermeable membrane without disturbing paper quality Yet another advantage is that the cleaning press of the present invention can be combined with an air press used for dewatering and/or can be used for impregnating/coating the paper web.
1 ~ BRIEF DESCRIPTION OF THE DRAWINGS
The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:
?0 Fig. 1 is a side view of a first embodiment of a papermaking machine including an apparatus for cleaning a semipermeable membrane;
Fiv. 2 is a side view of a second embodiment of a papermaking machine including an apparatus for cleanin<, a semipermeable membrane;
vU((i?07 US
Fig. 3 is a side view of a third embodiment of a papermaking machine including an apparatus for cleaning a semiperrneable membrane;
Fig. 4 is a side view of a fourth embodiment of a papermaking machine including an apparatus for cleaning a semipermeable membrane; and Fig. 5 is a side view of a fifth embodiment of a papermaking machine including an apparatus for cleaning a semipermeable membrane in combination with an air press used for dewatering.
Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate at least one preferred embodiment of the invention, in one form, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
DEVILED DESCRIPTION OF THE INVENTION
Referring now to the drawings, and more particularly to Fig. 1, there is shown a papermaking machine 10 configured for cleaning a semipermeable membrane 1?
used in a 1 ~ papermaking process. Papermaking machine 10 generally includes a cleaning fluid source 14, a cleaning fluid applicator 16, a press 18 and at least one transfer roll 19.
The cleaning fluid provided by cleaning fluid source 14 is preferably an anionic detergent, a cationic detergent, a surfactant, a soap, a solvent and/or a solvent mixture. The cleaning fluid may include water admixed therewith.
~0 Cleaning fluid applicator 16 is fluidly connected to cleaning fluid source 14 and is positioned adjacent to semipermeable membrane 12. Cleaning fluid applicator 16, shown schematically, is preferably a blade coater, a spray device or a transfer coater. Preferably, cleaning fluid applicator 16 is a spray device configured for applying the cleaning fluid under a hi~,_>h vas pressure, most preferably over a region of semipermeable membrane 12 which is VOIO?(l7 T1S
greater than the space between adjacent holes therein (not shown). As such, cleanin; fluid applicator 16 preferably produces a diverging spray, not a needle jet.
Press 18 is configured both for conveying_ and pressing semipermeable membrane 12.
The pressing action provided thereby flushes the cleaning fluid through and out of S semipermeabie membrane 12. Press 18 includes at least one press roll 20, one of which is illustrated in Fia. 1. In this embodiment, press roll 20 has positioned thereagainst a doctor blade 2? for removing debris and used cleaning fluid after pressing and cleaning occurs. A trough 26 is positioned below doctor blade ?? for collecting the removed debris and used cleaning fluid.
A second embodiment of the invention, as shown in Fig. ?, discloses a papermaking machine 30 which is capable of both cleaning semipermeable membrane 32 and pressing paper web ~4. Papermal:ing machine 30, in addition to semipermeable membrane 32, includes a permeable layer 36, a plurality of conveyor rolls 38, air press 40 and at least one of cleaning fluid sprayers 42a-4?d. Papermahing machine 30 may be used solely far cleaning semipermeable membrane 32 or may be used for pressing, coating andlor impregnating paper web 34, in IS addition to cleaning of semipermeable membrane 32 and permeable layer 36.
Semipermeable membrane 32 and permeable membrane 36 are provided for carrying paper web 34. Semipermeable membrane 32 has a low air permeability specially designed for displacement dewatering. Permeable membrane 36 has a high air permeability and may be a felt a wire, a press belt, drying fabric or an anti-rewet layer.
Air press 40 includes a f rst main roll 44, a second main roll 46, a first cap roll 48 and a second cap roll S0, which conjunctively define a pressurized air chamber S?.
The pressure of t~
air in pressurized air chamber S2 serves to flush the cleaning fluid through semipermeable membrane 3?. The pressure of the air therein is greater than atmospheric pressure (about 1 ba advanta~,.:eously more than about 2 bar and preferably greater than approximately S bar. First S
VOL(>~()i US
main roll 44 is vented (e.g., blind-drilled, grooved, etc.) so as to promote removal of water, used cleaning fluid and debris from semipermeable membrane 32.
At least one of cleaning fluid sprayers 42a-42d is provided as part of papermaking machine 30. Cleaning fluid sprayer 42a is directed toward semipermeable membrane 32 from a position just upstream of air press 40, relative to web travel direction 35.
Cleaning fluid sprayer 4?b extends into pressurized air chamber ~2 and is configured to deliver cleaning fluid onto semipermeable membrane 32 from within pressurized air chamber 52. Cleaning fluid sprayer 4?c is located adjacent to second cap roll 50. Cleaning fluid sprayer 42c and second cap roll ~0 together are configured to act as a transfer coater for indirectly delivering cleaning fluid onto semipermeable membrane 32. Similarly, cleaning fluid sprayer 42d and first cap roll 48 together also function as a transfer coater.
In yet another embodiment, paperznakina machine 60 (Fig. 3) includes a semipermeable membrane 62 and a permeable membrane 64 for carrying a paper web 66, an air press 68, a cleaning fluid applicator 70 and conveyor rolls 72.
Air press 68 includes a box arrangement 74 mounted adjacent a suction roll 76.
Box arrangement 74 and suction roll 76 coact to form an entrance nip 78 and an exit nip 80 therebetween, respectively through which semipermeable membrane 62, permeable membrane 64 and paper web 66 are fed into and out of air press 68. Box arrangement 74 and suction roll 76 to;ether define an air pressure chamber 8?. Box arrangement 74 has an air inlet line 84 ?0 associated therewith for introducing air under pressure into air pressure chamber 82.
Conversely, suction roll 76 is provided with a vacuum line 86 for creating a ne';ative pressure therein.
Cleaning fluid applicator 70 is positioned prior to entrance nip 78, relative to a web travel direction 87, and adjacent semipermeable membrane 62. Cleaning; fluid applicator 70 includes a vonuu? m sprayer 88 and an applicator roll 90 Sprayer SS delivers cleaning fluid 92 onto applicator roll 90 which, in turn, transfers cleaning fluid 92 to semipermeable membrane 62.
Alternatively or additionally to cleaning fluid applicator 70, a cleaning fluid dispenser (not shown) could be provided within air pressure chamber 12~_, in a manner similar to cleaning fluid sprayer 42b in Fig. ?.
A further embodiment of the invention is shown in Fig. 4. Specifically, papermaking machine 100 includes a semipermeable membrane 102 and a permeable membrane 104 for carrying a paper web 106, an air press 108, a cleaning fluid sprayer 110 and conveyor rolls 112.
Air press 108 includes a box arrangement 114 mounted adjacent a press shoe 116. Box arrangement 114 and press shoe 116 coact to form an entrance nip 118 and an exit nip 120 therebetween, respectively through which semipermeable membrane 102, permeable membrane 104 and paper web 106 are fed into and out of air press 108. Box arrangement 114 and press shoe 116 together define an air pressure chamber 122. Box arrangement 114 has an air inlet line 124 associated therewith for introducing air under pressure into air pressure chamber 122.
1 ~ Conversely, press shoe 116 is provided with a vacuum line 126 for creating a negative pressure therein. Additionally or alternatively to cleaning fluid sprayer 110, a cleaning fluid dispenser (not shown) could be provided within air pressure chamber 122 in a manner similar to cleaning fluid sprayer 42b in Fig. 2.
A yet another embodiment is set forth in Fig. 5. Papermaking machine 130 includes a semipermeable membrane 132 and a permeable membrane 13-1 for carrying a paper web 136, a two-stare air press 13 S and conveyor rolls 140.
Two-stage air press 138 is a cluster press that includes a first main roll 142, a second main roll 144, a third main roll 146 and four cap rolls 148. Preferably, first main roll 142 and second main roll 144 are vented in order to promote removal of water, used cleaning fluid VOIO?U7.US
(initially applied in a manner shown in Figs. 1-4) and/or debris. Stage one 160 of two-stage air press 13S is defined by first main roll 142, second main roll 144 and a pair of cap rolls 148.
Stake one 160 has a first air chamber 162 associated therewith. In the embodiment illustrated, semipermeable membrane 132 is fed into first air chamber 162 adjacent first main roll 142 to maximize the time spent thereby in first air chamber ls~. Conversely, permeable membrane 134 and paper web 136 are fed in later, adjacent to second main roll 144.
Stake two 164 is defined by second main roll 144, third main roll 146 and a pair of cap rolls 148. Stage two 154 has a second air chamber 156 associated therewith. In two-stage air press 138, first air chamber 162 is for cleaning, and second air chamber 156 is for dewatering.
Stage one 160 has at least one of a first flushing direction 158 and a second flushing direction 160 associated therewith, and stage two 154 has an associated dewaterin~ direction 162. First flushing direction 168 and second flushing direction 160 are directed at first main roll 142 and second main roll 144, respectively, within first air chamber 162.
Dewatering direction 162 extends toward second main roll 144 from inside second air chamber 166.
First flushing 16 direction 158 is substantially the same as dewatering direction 162 (relative to the orientation of papermaking machine 130) but is substantially diametrical to second flushing direction 160.
Each direction 168, 160 and 162 signifies movement of fluid from a high pressure chamber side toward one of vented main rolls 142 and 144. Stage one 160 may be chosen to be operated in first flushing direction 16S and/or second flushing direction 160 in order to achieve high cleanliness, especially if there are stickies in the pulp.
In cleaning semipermeable membrane 32, a cleaning fluid is provided and is applied on semipermeable membrane 32. .fir press 40 is provided and has pressurized air therein.
Semipermeable membrane 32 is conveyed into air press 40 and is subjected to the pressurized air vOlc>2«7.LJS
therein. The pressurized air flushes the cleaning fluid through semipermeable membrane 32, thereby cleaning semipermeable membrane 32.
While this invention has been described as having a preferred design, the present invention can be further modified 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 principles. 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 pertains and which fall within the limits of the appended claims.
v~tozco.~~s
Fig. 3 is a side view of a third embodiment of a papermaking machine including an apparatus for cleaning a semiperrneable membrane;
Fig. 4 is a side view of a fourth embodiment of a papermaking machine including an apparatus for cleaning a semipermeable membrane; and Fig. 5 is a side view of a fifth embodiment of a papermaking machine including an apparatus for cleaning a semipermeable membrane in combination with an air press used for dewatering.
Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate at least one preferred embodiment of the invention, in one form, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
DEVILED DESCRIPTION OF THE INVENTION
Referring now to the drawings, and more particularly to Fig. 1, there is shown a papermaking machine 10 configured for cleaning a semipermeable membrane 1?
used in a 1 ~ papermaking process. Papermaking machine 10 generally includes a cleaning fluid source 14, a cleaning fluid applicator 16, a press 18 and at least one transfer roll 19.
The cleaning fluid provided by cleaning fluid source 14 is preferably an anionic detergent, a cationic detergent, a surfactant, a soap, a solvent and/or a solvent mixture. The cleaning fluid may include water admixed therewith.
~0 Cleaning fluid applicator 16 is fluidly connected to cleaning fluid source 14 and is positioned adjacent to semipermeable membrane 12. Cleaning fluid applicator 16, shown schematically, is preferably a blade coater, a spray device or a transfer coater. Preferably, cleaning fluid applicator 16 is a spray device configured for applying the cleaning fluid under a hi~,_>h vas pressure, most preferably over a region of semipermeable membrane 12 which is VOIO?(l7 T1S
greater than the space between adjacent holes therein (not shown). As such, cleanin; fluid applicator 16 preferably produces a diverging spray, not a needle jet.
Press 18 is configured both for conveying_ and pressing semipermeable membrane 12.
The pressing action provided thereby flushes the cleaning fluid through and out of S semipermeabie membrane 12. Press 18 includes at least one press roll 20, one of which is illustrated in Fia. 1. In this embodiment, press roll 20 has positioned thereagainst a doctor blade 2? for removing debris and used cleaning fluid after pressing and cleaning occurs. A trough 26 is positioned below doctor blade ?? for collecting the removed debris and used cleaning fluid.
A second embodiment of the invention, as shown in Fig. ?, discloses a papermaking machine 30 which is capable of both cleaning semipermeable membrane 32 and pressing paper web ~4. Papermal:ing machine 30, in addition to semipermeable membrane 32, includes a permeable layer 36, a plurality of conveyor rolls 38, air press 40 and at least one of cleaning fluid sprayers 42a-4?d. Papermahing machine 30 may be used solely far cleaning semipermeable membrane 32 or may be used for pressing, coating andlor impregnating paper web 34, in IS addition to cleaning of semipermeable membrane 32 and permeable layer 36.
Semipermeable membrane 32 and permeable membrane 36 are provided for carrying paper web 34. Semipermeable membrane 32 has a low air permeability specially designed for displacement dewatering. Permeable membrane 36 has a high air permeability and may be a felt a wire, a press belt, drying fabric or an anti-rewet layer.
Air press 40 includes a f rst main roll 44, a second main roll 46, a first cap roll 48 and a second cap roll S0, which conjunctively define a pressurized air chamber S?.
The pressure of t~
air in pressurized air chamber S2 serves to flush the cleaning fluid through semipermeable membrane 3?. The pressure of the air therein is greater than atmospheric pressure (about 1 ba advanta~,.:eously more than about 2 bar and preferably greater than approximately S bar. First S
VOL(>~()i US
main roll 44 is vented (e.g., blind-drilled, grooved, etc.) so as to promote removal of water, used cleaning fluid and debris from semipermeable membrane 32.
At least one of cleaning fluid sprayers 42a-42d is provided as part of papermaking machine 30. Cleaning fluid sprayer 42a is directed toward semipermeable membrane 32 from a position just upstream of air press 40, relative to web travel direction 35.
Cleaning fluid sprayer 4?b extends into pressurized air chamber ~2 and is configured to deliver cleaning fluid onto semipermeable membrane 32 from within pressurized air chamber 52. Cleaning fluid sprayer 4?c is located adjacent to second cap roll 50. Cleaning fluid sprayer 42c and second cap roll ~0 together are configured to act as a transfer coater for indirectly delivering cleaning fluid onto semipermeable membrane 32. Similarly, cleaning fluid sprayer 42d and first cap roll 48 together also function as a transfer coater.
In yet another embodiment, paperznakina machine 60 (Fig. 3) includes a semipermeable membrane 62 and a permeable membrane 64 for carrying a paper web 66, an air press 68, a cleaning fluid applicator 70 and conveyor rolls 72.
Air press 68 includes a box arrangement 74 mounted adjacent a suction roll 76.
Box arrangement 74 and suction roll 76 coact to form an entrance nip 78 and an exit nip 80 therebetween, respectively through which semipermeable membrane 62, permeable membrane 64 and paper web 66 are fed into and out of air press 68. Box arrangement 74 and suction roll 76 to;ether define an air pressure chamber 8?. Box arrangement 74 has an air inlet line 84 ?0 associated therewith for introducing air under pressure into air pressure chamber 82.
Conversely, suction roll 76 is provided with a vacuum line 86 for creating a ne';ative pressure therein.
Cleaning fluid applicator 70 is positioned prior to entrance nip 78, relative to a web travel direction 87, and adjacent semipermeable membrane 62. Cleaning; fluid applicator 70 includes a vonuu? m sprayer 88 and an applicator roll 90 Sprayer SS delivers cleaning fluid 92 onto applicator roll 90 which, in turn, transfers cleaning fluid 92 to semipermeable membrane 62.
Alternatively or additionally to cleaning fluid applicator 70, a cleaning fluid dispenser (not shown) could be provided within air pressure chamber 12~_, in a manner similar to cleaning fluid sprayer 42b in Fig. ?.
A further embodiment of the invention is shown in Fig. 4. Specifically, papermaking machine 100 includes a semipermeable membrane 102 and a permeable membrane 104 for carrying a paper web 106, an air press 108, a cleaning fluid sprayer 110 and conveyor rolls 112.
Air press 108 includes a box arrangement 114 mounted adjacent a press shoe 116. Box arrangement 114 and press shoe 116 coact to form an entrance nip 118 and an exit nip 120 therebetween, respectively through which semipermeable membrane 102, permeable membrane 104 and paper web 106 are fed into and out of air press 108. Box arrangement 114 and press shoe 116 together define an air pressure chamber 122. Box arrangement 114 has an air inlet line 124 associated therewith for introducing air under pressure into air pressure chamber 122.
1 ~ Conversely, press shoe 116 is provided with a vacuum line 126 for creating a negative pressure therein. Additionally or alternatively to cleaning fluid sprayer 110, a cleaning fluid dispenser (not shown) could be provided within air pressure chamber 122 in a manner similar to cleaning fluid sprayer 42b in Fig. 2.
A yet another embodiment is set forth in Fig. 5. Papermaking machine 130 includes a semipermeable membrane 132 and a permeable membrane 13-1 for carrying a paper web 136, a two-stare air press 13 S and conveyor rolls 140.
Two-stage air press 138 is a cluster press that includes a first main roll 142, a second main roll 144, a third main roll 146 and four cap rolls 148. Preferably, first main roll 142 and second main roll 144 are vented in order to promote removal of water, used cleaning fluid VOIO?U7.US
(initially applied in a manner shown in Figs. 1-4) and/or debris. Stage one 160 of two-stage air press 13S is defined by first main roll 142, second main roll 144 and a pair of cap rolls 148.
Stake one 160 has a first air chamber 162 associated therewith. In the embodiment illustrated, semipermeable membrane 132 is fed into first air chamber 162 adjacent first main roll 142 to maximize the time spent thereby in first air chamber ls~. Conversely, permeable membrane 134 and paper web 136 are fed in later, adjacent to second main roll 144.
Stake two 164 is defined by second main roll 144, third main roll 146 and a pair of cap rolls 148. Stage two 154 has a second air chamber 156 associated therewith. In two-stage air press 138, first air chamber 162 is for cleaning, and second air chamber 156 is for dewatering.
Stage one 160 has at least one of a first flushing direction 158 and a second flushing direction 160 associated therewith, and stage two 154 has an associated dewaterin~ direction 162. First flushing direction 168 and second flushing direction 160 are directed at first main roll 142 and second main roll 144, respectively, within first air chamber 162.
Dewatering direction 162 extends toward second main roll 144 from inside second air chamber 166.
First flushing 16 direction 158 is substantially the same as dewatering direction 162 (relative to the orientation of papermaking machine 130) but is substantially diametrical to second flushing direction 160.
Each direction 168, 160 and 162 signifies movement of fluid from a high pressure chamber side toward one of vented main rolls 142 and 144. Stage one 160 may be chosen to be operated in first flushing direction 16S and/or second flushing direction 160 in order to achieve high cleanliness, especially if there are stickies in the pulp.
In cleaning semipermeable membrane 32, a cleaning fluid is provided and is applied on semipermeable membrane 32. .fir press 40 is provided and has pressurized air therein.
Semipermeable membrane 32 is conveyed into air press 40 and is subjected to the pressurized air vOlc>2«7.LJS
therein. The pressurized air flushes the cleaning fluid through semipermeable membrane 32, thereby cleaning semipermeable membrane 32.
While this invention has been described as having a preferred design, the present invention can be further modified 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 principles. 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 pertains and which fall within the limits of the appended claims.
v~tozco.~~s
Claims (24)
1. A method of cleaning a semipermeable membrane, said semipermeable membrane being configured for carrying a fiber web, said method comprising the steps o:
providing a cleaning fluid;
applying said cleaning fluid on said semipermeable membrane;
providing an air press, said air press being configured for carrying said semipermeable membrane therethrough, said air press having pressurized air therein;
conveying said semipermeable membrane through said air press; and subjecting said semipermeable membrane to said pressurized air within said air press, said pressurized air thereby flushing said cleaning fluid through said semipermeable membrane.
providing a cleaning fluid;
applying said cleaning fluid on said semipermeable membrane;
providing an air press, said air press being configured for carrying said semipermeable membrane therethrough, said air press having pressurized air therein;
conveying said semipermeable membrane through said air press; and subjecting said semipermeable membrane to said pressurized air within said air press, said pressurized air thereby flushing said cleaning fluid through said semipermeable membrane.
2. The method of claim 1, wherein said cleaning fluid is comprised of at least one of an anionic detergent, a cationic detergent, a surfactant, a soap, a solvent and a solvent mixture.
3. The method of claim 2, wherein said cleaning fluid further includes water.
4. The method of claim 1, wherein said cleaning fluid is applied at least one of inside and outside of said air press.
5. The method of claim 1, wherein said applying step includes at least one of blade-coating said cleaning fluid on said semipermeable membrane; spraying said cleaning fluid on said semipermeable membrane; and applying said cleaning fluid on a roll and transferring said cleaning fluid from said roll onto said semipermeable membrane.
6. The method of claim 5, wherein said applying step includes spraying said cleaning fluid in a manner so as to form a divergent spray thereof.
7. The method of claim 1, wherein said air press includes a plurality of rolls, one of said rolls being a cap roll, said applying step including the substeps of:
applying said cleaning fluid on said cap roll; and transferring said cleaning fluid from said cap roll onto said semipermeable membrane.
applying said cleaning fluid on said cap roll; and transferring said cleaning fluid from said cap roll onto said semipermeable membrane.
8. The method of claim 1, wherein said air press is one of a multiple-roll cluster arrangement and a box arrangement, each of said multiple-roll cluster arrangement and said box arrangement defining a pressurized chamber, said pressurized chamber having said pressurized air therein.
9. The method of claim 1, wherein a flushing pressure of said pressurized air on said semipermeable membrane is greater than approximately atmospheric pressure.
10. The method of claim 9, wherein said flushing pressure is greater than approximately 2 bar.
11. The method of claim 10, wherein said flushing pressure is Greater than approximately bar.
12. The method of claim 1, wherein said air press is a cleaning press used for cleaning said semipermeable membrane.
13. The method of claim 12, wherein said cleaning press is further configured for at least one of impregnating and coating the fiber web carried by said semipermeable membrane.
14. The method of claim 12, further comprising the steps of:
providing a second air press, said semipermeable membrane having a membrane direction of travel, said second air press being located after said cleaning press in said membrane direction of travel;
carrying said semipermeable membrane through said second air press; and dewatering said semipermeable membrane within said second air press.
providing a second air press, said semipermeable membrane having a membrane direction of travel, said second air press being located after said cleaning press in said membrane direction of travel;
carrying said semipermeable membrane through said second air press; and dewatering said semipermeable membrane within said second air press.
15. The method of claim 14, wherein said cleaning press and said second air press conjunctively form a two-chamber cluster arrangement.
16. The method of claim 14, wherein each of said first air press and said second air press have at least one vented member associated therewith, said pressurized air in said cleaning press forcing cleaning fluid toward one said at least one vented member associated therewith, said pressurized air in said second air press forcing water toward one said at least one vented member associated therewith.
17. An apparatus for cleaning a semipermeable membrane, said semipermeable membrane being configured for carrying a fiber web, said apparatus comprising:
a source of a cleaning fluid;
an applicator configured for applying said cleaning fluid to said semipermeable membrane; and an air press configured for carrying said semipermeable membrane therethrough, said air press having pressurized air therein, said air press thereby being configured for flushing said cleaning fluid through said semipermeable membrane.
a source of a cleaning fluid;
an applicator configured for applying said cleaning fluid to said semipermeable membrane; and an air press configured for carrying said semipermeable membrane therethrough, said air press having pressurized air therein, said air press thereby being configured for flushing said cleaning fluid through said semipermeable membrane.
18. The apparatus of claim 17, wherein said cleaning fluid is comprised of at least one of an anionic detergent, a cationic detergent, a surfactant, a soap, a solvent and a solvent mixture.
19. The apparatus of claim 17, wherein said applicator is one of a blade coater, a spray device, and a transfer coater.
20. The apparatus of claim 19, wherein said air press includes a plurality of rolls, one of said rolls being a cap roll, said applicator being said transfer coater, said cap roll functioning as a transfer roll of said transfer coater.
21. The apparatus of claim 17, wherein said air press is one of a multiple-roll cluster arrangement and a box arrangement, each of said multiple-roll cluster arrangement and said box arrangement defining a pressurized chamber, said pressurized chamber having said pressurized air therein.
22. The apparatus of claim 17, wherein said air press is a cleaning press used for cleaning the semipermeable membrane, said apparatus further comprising a second air press, the semipermeable membrane having a membrane direction of travel, said second air press being located after said cleaning press in the membrane direction of travel.
23. An apparatus for cleaning a semipermeable membrane, said semipermeable membrane being configured for carrying a fiber web, said apparatus comprising:
a source of a cleaning fluid;
an applicator configured for applying said cleaning fluid to said semipermeable membrane; and a press configured for pressing said semipermeable membrane and for thereby flushing said cleaning fluid therethrough.
a source of a cleaning fluid;
an applicator configured for applying said cleaning fluid to said semipermeable membrane; and a press configured for pressing said semipermeable membrane and for thereby flushing said cleaning fluid therethrough.
24. A papermaking machine, said machine comprising:
a semipermeable membrane, said semipermeable membrane being configured for carrying a fiber web;
a plurality of conveyor rolls, each conveyor roll configured for carrying at least one of said semipermeable membrane and said fiber web;
a source of a cleaning fluid;
an applicator configured for applying said cleaning fluid to said semipermeable membrane; and an air press configured for carrying said semipermeable membrane therethrough, said air press having pressurized air therein, said air press thereby being configured for flushing said cleaning fluid through said semipermeable membrane.
a semipermeable membrane, said semipermeable membrane being configured for carrying a fiber web;
a plurality of conveyor rolls, each conveyor roll configured for carrying at least one of said semipermeable membrane and said fiber web;
a source of a cleaning fluid;
an applicator configured for applying said cleaning fluid to said semipermeable membrane; and an air press configured for carrying said semipermeable membrane therethrough, said air press having pressurized air therein, said air press thereby being configured for flushing said cleaning fluid through said semipermeable membrane.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/965,435 | 2001-09-27 | ||
| US09/965,435 US6673210B2 (en) | 2001-09-27 | 2001-09-27 | Cleaning a semipermeable membrane in a papermaking machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2405374A1 true CA2405374A1 (en) | 2003-03-27 |
Family
ID=25509959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002405374A Abandoned CA2405374A1 (en) | 2001-09-27 | 2002-09-26 | Cleaning a semipermeable membrane in a papermaking machine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6673210B2 (en) |
| EP (1) | EP1298245A3 (en) |
| JP (1) | JP2003183993A (en) |
| CA (1) | CA2405374A1 (en) |
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- 2001-09-27 US US09/965,435 patent/US6673210B2/en not_active Expired - Fee Related
-
2002
- 2002-09-18 EP EP02020895A patent/EP1298245A3/en not_active Withdrawn
- 2002-09-19 JP JP2002273486A patent/JP2003183993A/en active Pending
- 2002-09-26 CA CA002405374A patent/CA2405374A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP1298245A2 (en) | 2003-04-02 |
| US6673210B2 (en) | 2004-01-06 |
| JP2003183993A (en) | 2003-07-03 |
| EP1298245A3 (en) | 2003-09-03 |
| US20030056919A1 (en) | 2003-03-27 |
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| Date | Code | Title | Description |
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| FZDE | Discontinued |