CA2026098A1 - Method and device for guiding the paper web in a coating machine - Google Patents
Method and device for guiding the paper web in a coating machineInfo
- Publication number
- CA2026098A1 CA2026098A1 CA 2026098 CA2026098A CA2026098A1 CA 2026098 A1 CA2026098 A1 CA 2026098A1 CA 2026098 CA2026098 CA 2026098 CA 2026098 A CA2026098 A CA 2026098A CA 2026098 A1 CA2026098 A1 CA 2026098A1
- Authority
- CA
- Canada
- Prior art keywords
- drying
- paper web
- coated paper
- web
- gap
- 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
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0063—Devices for threading a web tail through a paper-making machine
- D21G9/0072—Devices for threading a web tail through a paper-making machine using at least one rope
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/18—Drying webs by hot air
- D21F5/185—Supporting webs in hot air dryers
- D21F5/187—Supporting webs in hot air dryers by air jets
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
- F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts
- F26B13/104—Supporting materials without tension, e.g. on or between foraminous belts supported by fluid jets only; Fluid blowing arrangements for flotation dryers, e.g. coanda nozzles
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paper (AREA)
- Drying Of Solid Materials (AREA)
Abstract
METHOD AND APPARATUS FOR DRYING
A PAPER WEB IN A COATING MACHINE
ABSTRACT OF THE DISCLOSURE
A method for drying a paper web in a coating machine, comprising the steps of guiding a paper web (W) that has been coated at one side or at both sides through the drying gap in a dryer unit or units (20, 20a, 22, 22a, 25, 25a), wherein the web is supported and dried by means of air jets (F) without contacting the dryer unit or units. Both the threading of the leader of the web (W) and the supporting and guiding of the full-width web (W) are carried out by web supporting and drying devices (10, 23, 24), wherein, at least in the area of the leader, most appropriately over the entire width of the web (W), air blowings (F) directed along the direction of running of the web (W) are employed. An apparatus for carrying out the method, includes one or more coating stations, a dryer or dryers (20, 20a, 22, 22a, 25, 25a) placed after a coating station and/or between subsequent coating stations, the dryer/dryers being either air jet dryers and/or combined infrared air jet web dryers through whose drying gap the web (W) is passed while being supported by air so as not to contact the dryers. In connection with the dryer units (20, 20a, 22, 22a, 25, 25a), a guide device or guide devices (10, 23, 24) which also support the web by air without contacting it is/are integrated, which operate(s) both for threading the leader of the web and for support and guidance for a full width web (W).
A PAPER WEB IN A COATING MACHINE
ABSTRACT OF THE DISCLOSURE
A method for drying a paper web in a coating machine, comprising the steps of guiding a paper web (W) that has been coated at one side or at both sides through the drying gap in a dryer unit or units (20, 20a, 22, 22a, 25, 25a), wherein the web is supported and dried by means of air jets (F) without contacting the dryer unit or units. Both the threading of the leader of the web (W) and the supporting and guiding of the full-width web (W) are carried out by web supporting and drying devices (10, 23, 24), wherein, at least in the area of the leader, most appropriately over the entire width of the web (W), air blowings (F) directed along the direction of running of the web (W) are employed. An apparatus for carrying out the method, includes one or more coating stations, a dryer or dryers (20, 20a, 22, 22a, 25, 25a) placed after a coating station and/or between subsequent coating stations, the dryer/dryers being either air jet dryers and/or combined infrared air jet web dryers through whose drying gap the web (W) is passed while being supported by air so as not to contact the dryers. In connection with the dryer units (20, 20a, 22, 22a, 25, 25a), a guide device or guide devices (10, 23, 24) which also support the web by air without contacting it is/are integrated, which operate(s) both for threading the leader of the web and for support and guidance for a full width web (W).
Description
2~0~8 so-~s MBT~OD AND APPAR~TU8 FOR DRYING
A PAPBR ~B IN A COATING ~AC~INB
BAC~GROUND OF THB I~nRNTION
The invention concerns a method for drying a paper web in a ~; coating machine, in Which method a paper web that has been coated on --one side or on both sides iS run through the drying gap in a dryer unit or units, wherein the web iS supported and drièd by means of air ~;
jets without being contacted by the dryers producing the air jets. ~ -The invention further concerns a coating-drying device intended for carrying out the method, comprising one or several coating stations, a dryer or dryers placed after the coating station and/or between subsequent Coating stations, these dryer/dryers being éither plural gas nozzle web dryors and/or combined infrared and plur41~gas nozzle web dryers through whose drying gap the web is passed~supported by air and free`of contact With the dryers.
As~is~known in the prior a~rt,~problems have occurred in the threading~oP the~papèr web in a~coating machine. In partlcuIar, ` ~ lem~s~have~occurred ln "on-machlne"~coat1ng machines, where1n the ~thre~dl~ng takes place at full speed, 1.e. the speed~may be up to 1500 ~;` ~ min.`~ In~ways known in the prior art, a number of different modes have been émployed for threading~of~ the web. In "on-machine"
ppara~u8es, the threading of the web~has been accomplished by means ~of guiding;~ rope8.~ A180, ln prior~art apparatuses, flat belts ~;similar`to~ropes~or~a~ pUsh-button" blow plate have been used.
~: Moreover,~ as is known in the pr10r~art, it has been possible to carry 202~98 out the threading manually by using a low running speed, especially in "off-machine" coating machines. A little used structure for threading of the web is based on flying reel exchanges.
In the prior art, in "on-machine" apparatuses, the threading of the web by means of threading ropes has been accomplished as follows: At the edge of the paper web at the operating side, double ropes placed one above the other and guided by pulleys revolve, the cut leader of the web being guided into the inlet nip between these ropes. The ropes lock the leader between them and carry it through the machine. In a paper making machine the apparatus of threading of the web based on threading ropes operates well when the adjustments are correct. However, the structure based on threading ropes does not operate adequately in a coating machine. For example, problems of the following types occur in the prior art: The threading ropes are worn and stretched and may thereby cause operating problems and standstills. The use of threading ropes for threading of the web requires experienced operating personnel, for the threading by means of threading ropes is, in itself, not easy to accomplish. Threading of a web by means of threading ropes operates well when the speed of the paper web is lower than 1000 m/min. At higher speeds problems occur, as a result of which the times taken by breaks become longer.
During threading, the leader becomes dry, whereby the susceptibility to breaks become higher. Moreover, in threading taking place by means of threading ropes, rapidly revolving parts are employed, which may cause problems of safety during work. A system of ropes also has a complicated construction and is expensive to carry out.
; As is known in the prior art, for guiding the paper web on a coating machine and in particular for leading the web, tension rolls have been used. These tension rolls have been cooled teflon-coated --``" 2026098 chromium leading rolls or cylinders, which are expensive both with respect to their material and with respect to their cost of manufacture. Moreover, in leading of the web carried out by means of tension rolls, problems caused by formation of spots have occurred because of the moistness of the paper web. Moreover, when coating is carried out, the web must not contact the rolls, because in such a case flaws might arise in the coating.
8UMHARY OF T~ INV~TION
Objects of the invention are to provide both a method and an apparatus for guiding the paper web in a coating machine wherein the above detrimental factors present in prior art methods and apparatuses do not occur. Moreover, another object is to make the invention suitable for other applications of a coating machine as well as threading.
The prior art apparatuses based on contact-free handling of the web consist of a number of nozzle boxes, out of whose nozzles a gas flow that supports and/or dries the web is applied to the web.
The nozzle in these devices can be divided into two groups:
nozzles with positive pressure (float nozzles) and nozzles with negative pressure (foil nozzles). The operation of the nozzle with positive pressure is based on the air cushion principle. The nozzles with negative pressure attract the web and stabilize the run of the web, whereby the tensile force applied to the web is based, as is well known, on a gas flow field parallel to the web, this flow field forming a static negative pressure between the web and the carrier face of the nozzle.
Both in nozzles with positive pressure and in nozzles with negative pressure, the coanda effect is employed in order to guide air in the desired direction.
~r 2~2~0~8 With a view to achieving the objects stated above and those that will be explained hereinafter, the method in accordance with the invention mainly comprises both the threading of the leader of the web and the supporting and guiding of the full width web being carried out by means of contact-free gas nozzle web supporting and drying devices, wherein, at least in the area of the leader, most appropriately over the entire width of the web, blowings directed along the direction of runn~ng of the web are employed.
Moreover, the apparatus in accordance with the invention comprises dryer units and, in connection with the dryer units, a contact-free guide device or guide devices based on air support, which device(s) operate~s) both as means for threading the leader of the web and as support and guide means for a full-width web.
By means of the guide device in accordance with the present nvention, the present day threading ropes are replaced. The device in accordance with the invention is not sensitive to wear, as are the threading ropes, and, moreover, the device in accordance with the invention is also useful in other applications, besides during the threading of the web. By means of the device in accordance with the invention, the leading and spreading rolls present in the prior art apparatuses are substituted for.
Air is blown during threading of the web in accordance with ; , ~
the invention, and thereby evaporation is promoted. If necessary, it is also possible to use warm air. According to the invention, it is also possible to accomplish threading of the web starting from the ;
middle thereof, and by regulating the moisture of the air it is possible to prevent drying of the web and the resulting increased susceptibility to breaks during threading of the web.
In the guiding of the paper web in accordance with the _L~
' '' ~ `' " '. ' . ' ' ' ', ' " " ' ~ ' ' ' ' ' ,, ~ ' . ' ' ' - ` ~
6~8 invention, the paper web does not contact the leading members, whereby no problem of formation of spots occurs. Thus, the apparatus in accordance with the invention is well suitable for use in two sided coating. Moreover, when an apparatus in accordance with the invention is used, separate cylinders needinq cooling and related complicated structures are not needed.
Nor has the device in accordance with the invention any limitations with respect to machine speed and, moreover, when the device is used, components that constitute safety risks are eliminated from the coating machine.
BRIBF DF8CRIPTION OF T~ DRAWING8 In the following, the invention will be described in detail with reference to a preferred exemplifying embodiment of the invention illustrated in the Figures in the accompanying drawings, the invention being, however, by no means strictly confined to the details of these embodiments.
Figure 1 is a schematical illustration of a preferred embodiment of the threading system in accordance with the invention.
Figure 2 is a schematical illustration of a guide device in accordance with the invention.
Figure 3 is a schematical illustration of the threading apparatus in accordance with the invention.
Figure 4 is a schematical illustration of the air flow of the plural nozzle foil units of the invention.
Figure 5 i5 a schematical illustration of the air flow of a guide device in accordance with the invention.
Figure 6 is a schematical illustration of a second preferred embodiment of the threading apparatus in accordance with the invention.
,_ s--,~
;~
2~2~8 Figure 7 is a schematical illustration of a preferred embodiment of the device in accordance with the invention as applied in a multicylinder dryer.
Dl~igi~RIPl!ION OF q~Ei PRI~FBRR13D ~MBODINI~NTEi Fig. 1 shows a paper web guide apparatus in accordance with the invention as app:~ied in a coating machine of the SYM-SIZER R
type (Applicant's trademark). The paper web W runs around but does not contact the guide device 10 provided with negative pressure nozzles and then runs toward the support nozzle 20, 20a. In the Figure the IR (infrared) dryers are denoted with the reference numerals 21, 21a. The paper web then runs between the plural nozzle foil units 22, 22a whose nozzles concurrently blow on the web. The direction of the air flow is denoted with the arrows F. The plural nozzle foil unit 22a is provided with a curved guide end 23, which guides the web, free of contact therewith, further along. Hereupon the web has a short draw Wp without support blowings, the length L
of this draw being maximally 2 meters, most appropriately 0.5 to 1.5 m. Thereupon the paper web W meets another plural nozzle foil unit 25a provided with a curved guide end 24, as well as the plural nozzle .
foil unit 25. From there the paper web goes further to a multi -~
cylinder dryer, whose cylinders are denoted with the reference ~ ;~
numerals 50. According to the invention, the concurrent blowings F
guide the run of the web. As is shown in the Figure, the air flow F
: :
catches the end of the paper web from the guide device 23 and ejects it to the next guide device 24, whose concurrent blowings F guide the ~; web further. In this way the paper web W is guided across the free~
draw Wp The apparatus in accordance with the invention is uniform across the entire width of the paper web W, and the apparatus can -2~)2~0~8 have nozzle adjustment to achieve a particular threading position, in which only the blow width required by the lesser width leader is employed, whereupon, when the web reaches its full width, the apparatus is set into the guide position. The threading position may be, for example, between the open closed positions of the nozzles.
Fig. 2 is a schematical illustration of a guide device which is provided with negative pressure. The direction of the air flow is denoted with the reference arrows F. Such a guide device 10 provided with nozzles 11 of negative pressure attracts the paper web that runs into its proximity. The negative pressure nozzles 11 with concurrent blowings F are installed in compliance with the desired run of the web, whereby the end of the paper web can be passed through the coating machine without threading ropes. In a coating machine with a threading and guide system in accordance with the invention, the other guide devices and ends thereof 19, 23, 24, 26 have similar structures.
The guide device 10 in accordance with Figure 2 extends across the entire width of the web, and after threading it is used for guiding the whole paper web W. The intensity of the blowings F
, . .
from the guide device 10 may be adjusted to be less when threading the leader of the web than when guiding the width of the entire web.
Figure 3 is a schematical illustration of the concurrent foil alrborne units 25 and 25a, both of which are provided with guiding ends, the guide end 24 for the plural nozzle foil unit 25a and the guide end 26 for the plural nozzle foil unit 25. In the Figure, the negative pressure nozzles are denoted with the reference numeral 11.
Figure 4 shows an air flow diagram of the plural nozzle units in the paper web guide system in accordance with the ~.~,..~ .~., ... ~ , ;,,: -"':, ' ':.' 1 ,, 2026~9~
invention. In the diagram the reference numerals 66 and 67 representthe air intake ducts for the compressed-air system. The reference numerals 60 represent the blowers through which the air passes into the heat exchanger 61. Through the intake duct 64 the compressed air is passed to the inlet 62a of the plural nozzle foil unit 22a; 25a and to the inlet 62 of the foil unit 22:25. Through the outlet 63a and 63 of compressed air the air is passed out of the foil units 22;25 and 22a;25a, respectively. Through the outlet duct 65, the compressed air is passed either through the exhaust duct 68 out of the compressed air system or into the duct 67 in a partially closed system circulation. By means of the cylinder 69, when necessary, the plural nozzle flow unit 22a;25a can be shifted respectively to the positions open-threading-closed.
Fig. 5 shows an air flow diagram of a guide device in accordance with the invention. The compressed air is passed along the intake duct 71 into the blower 70, from which it is passed further through the duct 72 to the guide device or guide end 10;19:23;24;26.
Fig. 6 shows an application of the thread~ng system in accordance with the invention in a blade-position arrangement of the AUTOBLADE R type (Applicant's trademark). Being pulled by the guide device 19 provided with a negative pressure nozzle, the paper web W runs further between the IR dryers 21, 21a, being supported further by the air flow F of the foil units 22, 22a, by passing the -;
curved guiding end of the foil unit 22a. After the free run Wp the run of the paper web W is supported by the foil unit 25 provided with a guiding end 24 as well as by foil unit 24a, which is also provided with a curved guiding end 26 to guide the web. In this exemplifying ;;~
embodiment of the invention, the multicylinder dryer 40 is also .~
I.i,/, ,,j., ' " :, ,,,, , ., , ", . , ' . ' ~ ' ' ' ' .
2026~
provided with an airborne based paper web support device 41 for guiding and threading as well as for threading of the paper web. The lower wire in the multicylinder dryer 40 is denoted with the reference numeral 51.
Fig. 7 shows a paper web support device 41 for a multicylinder dryer 40, this support device being provided with a web detaching jet nozzle 42 and with foil nozzles 43. The chamber for equalization of excessive pressure is denoted with the reference numeral 44, and the nozzle used for conditioning of the nip is denoted with the reference numeral 45.
In the paper web guide system in accordance with the invention, the plural nozzle foil units with concurrent blowing pulls the paper web W and feeds it forwards. Owing to their nozzles with negative pressure, the guide devices also attract the paper web placed in their proximity. The threading in the cylinder part requires twin wire draw if it is desirable to use the paper web threading and guide device 41 in accordance with the invention in a multicylinder dryer. The device in accordance with the invention is as such not suitable for solutions with single wire draw.
In the following, the patent claims will be given, and the various details of the invention may show variations within the scope of the inventive idea defined in these claims.
,,~
!
.
s
A PAPBR ~B IN A COATING ~AC~INB
BAC~GROUND OF THB I~nRNTION
The invention concerns a method for drying a paper web in a ~; coating machine, in Which method a paper web that has been coated on --one side or on both sides iS run through the drying gap in a dryer unit or units, wherein the web iS supported and drièd by means of air ~;
jets without being contacted by the dryers producing the air jets. ~ -The invention further concerns a coating-drying device intended for carrying out the method, comprising one or several coating stations, a dryer or dryers placed after the coating station and/or between subsequent Coating stations, these dryer/dryers being éither plural gas nozzle web dryors and/or combined infrared and plur41~gas nozzle web dryers through whose drying gap the web is passed~supported by air and free`of contact With the dryers.
As~is~known in the prior a~rt,~problems have occurred in the threading~oP the~papèr web in a~coating machine. In partlcuIar, ` ~ lem~s~have~occurred ln "on-machlne"~coat1ng machines, where1n the ~thre~dl~ng takes place at full speed, 1.e. the speed~may be up to 1500 ~;` ~ min.`~ In~ways known in the prior art, a number of different modes have been émployed for threading~of~ the web. In "on-machine"
ppara~u8es, the threading of the web~has been accomplished by means ~of guiding;~ rope8.~ A180, ln prior~art apparatuses, flat belts ~;similar`to~ropes~or~a~ pUsh-button" blow plate have been used.
~: Moreover,~ as is known in the pr10r~art, it has been possible to carry 202~98 out the threading manually by using a low running speed, especially in "off-machine" coating machines. A little used structure for threading of the web is based on flying reel exchanges.
In the prior art, in "on-machine" apparatuses, the threading of the web by means of threading ropes has been accomplished as follows: At the edge of the paper web at the operating side, double ropes placed one above the other and guided by pulleys revolve, the cut leader of the web being guided into the inlet nip between these ropes. The ropes lock the leader between them and carry it through the machine. In a paper making machine the apparatus of threading of the web based on threading ropes operates well when the adjustments are correct. However, the structure based on threading ropes does not operate adequately in a coating machine. For example, problems of the following types occur in the prior art: The threading ropes are worn and stretched and may thereby cause operating problems and standstills. The use of threading ropes for threading of the web requires experienced operating personnel, for the threading by means of threading ropes is, in itself, not easy to accomplish. Threading of a web by means of threading ropes operates well when the speed of the paper web is lower than 1000 m/min. At higher speeds problems occur, as a result of which the times taken by breaks become longer.
During threading, the leader becomes dry, whereby the susceptibility to breaks become higher. Moreover, in threading taking place by means of threading ropes, rapidly revolving parts are employed, which may cause problems of safety during work. A system of ropes also has a complicated construction and is expensive to carry out.
; As is known in the prior art, for guiding the paper web on a coating machine and in particular for leading the web, tension rolls have been used. These tension rolls have been cooled teflon-coated --``" 2026098 chromium leading rolls or cylinders, which are expensive both with respect to their material and with respect to their cost of manufacture. Moreover, in leading of the web carried out by means of tension rolls, problems caused by formation of spots have occurred because of the moistness of the paper web. Moreover, when coating is carried out, the web must not contact the rolls, because in such a case flaws might arise in the coating.
8UMHARY OF T~ INV~TION
Objects of the invention are to provide both a method and an apparatus for guiding the paper web in a coating machine wherein the above detrimental factors present in prior art methods and apparatuses do not occur. Moreover, another object is to make the invention suitable for other applications of a coating machine as well as threading.
The prior art apparatuses based on contact-free handling of the web consist of a number of nozzle boxes, out of whose nozzles a gas flow that supports and/or dries the web is applied to the web.
The nozzle in these devices can be divided into two groups:
nozzles with positive pressure (float nozzles) and nozzles with negative pressure (foil nozzles). The operation of the nozzle with positive pressure is based on the air cushion principle. The nozzles with negative pressure attract the web and stabilize the run of the web, whereby the tensile force applied to the web is based, as is well known, on a gas flow field parallel to the web, this flow field forming a static negative pressure between the web and the carrier face of the nozzle.
Both in nozzles with positive pressure and in nozzles with negative pressure, the coanda effect is employed in order to guide air in the desired direction.
~r 2~2~0~8 With a view to achieving the objects stated above and those that will be explained hereinafter, the method in accordance with the invention mainly comprises both the threading of the leader of the web and the supporting and guiding of the full width web being carried out by means of contact-free gas nozzle web supporting and drying devices, wherein, at least in the area of the leader, most appropriately over the entire width of the web, blowings directed along the direction of runn~ng of the web are employed.
Moreover, the apparatus in accordance with the invention comprises dryer units and, in connection with the dryer units, a contact-free guide device or guide devices based on air support, which device(s) operate~s) both as means for threading the leader of the web and as support and guide means for a full-width web.
By means of the guide device in accordance with the present nvention, the present day threading ropes are replaced. The device in accordance with the invention is not sensitive to wear, as are the threading ropes, and, moreover, the device in accordance with the invention is also useful in other applications, besides during the threading of the web. By means of the device in accordance with the invention, the leading and spreading rolls present in the prior art apparatuses are substituted for.
Air is blown during threading of the web in accordance with ; , ~
the invention, and thereby evaporation is promoted. If necessary, it is also possible to use warm air. According to the invention, it is also possible to accomplish threading of the web starting from the ;
middle thereof, and by regulating the moisture of the air it is possible to prevent drying of the web and the resulting increased susceptibility to breaks during threading of the web.
In the guiding of the paper web in accordance with the _L~
' '' ~ `' " '. ' . ' ' ' ', ' " " ' ~ ' ' ' ' ' ,, ~ ' . ' ' ' - ` ~
6~8 invention, the paper web does not contact the leading members, whereby no problem of formation of spots occurs. Thus, the apparatus in accordance with the invention is well suitable for use in two sided coating. Moreover, when an apparatus in accordance with the invention is used, separate cylinders needinq cooling and related complicated structures are not needed.
Nor has the device in accordance with the invention any limitations with respect to machine speed and, moreover, when the device is used, components that constitute safety risks are eliminated from the coating machine.
BRIBF DF8CRIPTION OF T~ DRAWING8 In the following, the invention will be described in detail with reference to a preferred exemplifying embodiment of the invention illustrated in the Figures in the accompanying drawings, the invention being, however, by no means strictly confined to the details of these embodiments.
Figure 1 is a schematical illustration of a preferred embodiment of the threading system in accordance with the invention.
Figure 2 is a schematical illustration of a guide device in accordance with the invention.
Figure 3 is a schematical illustration of the threading apparatus in accordance with the invention.
Figure 4 is a schematical illustration of the air flow of the plural nozzle foil units of the invention.
Figure 5 i5 a schematical illustration of the air flow of a guide device in accordance with the invention.
Figure 6 is a schematical illustration of a second preferred embodiment of the threading apparatus in accordance with the invention.
,_ s--,~
;~
2~2~8 Figure 7 is a schematical illustration of a preferred embodiment of the device in accordance with the invention as applied in a multicylinder dryer.
Dl~igi~RIPl!ION OF q~Ei PRI~FBRR13D ~MBODINI~NTEi Fig. 1 shows a paper web guide apparatus in accordance with the invention as app:~ied in a coating machine of the SYM-SIZER R
type (Applicant's trademark). The paper web W runs around but does not contact the guide device 10 provided with negative pressure nozzles and then runs toward the support nozzle 20, 20a. In the Figure the IR (infrared) dryers are denoted with the reference numerals 21, 21a. The paper web then runs between the plural nozzle foil units 22, 22a whose nozzles concurrently blow on the web. The direction of the air flow is denoted with the arrows F. The plural nozzle foil unit 22a is provided with a curved guide end 23, which guides the web, free of contact therewith, further along. Hereupon the web has a short draw Wp without support blowings, the length L
of this draw being maximally 2 meters, most appropriately 0.5 to 1.5 m. Thereupon the paper web W meets another plural nozzle foil unit 25a provided with a curved guide end 24, as well as the plural nozzle .
foil unit 25. From there the paper web goes further to a multi -~
cylinder dryer, whose cylinders are denoted with the reference ~ ;~
numerals 50. According to the invention, the concurrent blowings F
guide the run of the web. As is shown in the Figure, the air flow F
: :
catches the end of the paper web from the guide device 23 and ejects it to the next guide device 24, whose concurrent blowings F guide the ~; web further. In this way the paper web W is guided across the free~
draw Wp The apparatus in accordance with the invention is uniform across the entire width of the paper web W, and the apparatus can -2~)2~0~8 have nozzle adjustment to achieve a particular threading position, in which only the blow width required by the lesser width leader is employed, whereupon, when the web reaches its full width, the apparatus is set into the guide position. The threading position may be, for example, between the open closed positions of the nozzles.
Fig. 2 is a schematical illustration of a guide device which is provided with negative pressure. The direction of the air flow is denoted with the reference arrows F. Such a guide device 10 provided with nozzles 11 of negative pressure attracts the paper web that runs into its proximity. The negative pressure nozzles 11 with concurrent blowings F are installed in compliance with the desired run of the web, whereby the end of the paper web can be passed through the coating machine without threading ropes. In a coating machine with a threading and guide system in accordance with the invention, the other guide devices and ends thereof 19, 23, 24, 26 have similar structures.
The guide device 10 in accordance with Figure 2 extends across the entire width of the web, and after threading it is used for guiding the whole paper web W. The intensity of the blowings F
, . .
from the guide device 10 may be adjusted to be less when threading the leader of the web than when guiding the width of the entire web.
Figure 3 is a schematical illustration of the concurrent foil alrborne units 25 and 25a, both of which are provided with guiding ends, the guide end 24 for the plural nozzle foil unit 25a and the guide end 26 for the plural nozzle foil unit 25. In the Figure, the negative pressure nozzles are denoted with the reference numeral 11.
Figure 4 shows an air flow diagram of the plural nozzle units in the paper web guide system in accordance with the ~.~,..~ .~., ... ~ , ;,,: -"':, ' ':.' 1 ,, 2026~9~
invention. In the diagram the reference numerals 66 and 67 representthe air intake ducts for the compressed-air system. The reference numerals 60 represent the blowers through which the air passes into the heat exchanger 61. Through the intake duct 64 the compressed air is passed to the inlet 62a of the plural nozzle foil unit 22a; 25a and to the inlet 62 of the foil unit 22:25. Through the outlet 63a and 63 of compressed air the air is passed out of the foil units 22;25 and 22a;25a, respectively. Through the outlet duct 65, the compressed air is passed either through the exhaust duct 68 out of the compressed air system or into the duct 67 in a partially closed system circulation. By means of the cylinder 69, when necessary, the plural nozzle flow unit 22a;25a can be shifted respectively to the positions open-threading-closed.
Fig. 5 shows an air flow diagram of a guide device in accordance with the invention. The compressed air is passed along the intake duct 71 into the blower 70, from which it is passed further through the duct 72 to the guide device or guide end 10;19:23;24;26.
Fig. 6 shows an application of the thread~ng system in accordance with the invention in a blade-position arrangement of the AUTOBLADE R type (Applicant's trademark). Being pulled by the guide device 19 provided with a negative pressure nozzle, the paper web W runs further between the IR dryers 21, 21a, being supported further by the air flow F of the foil units 22, 22a, by passing the -;
curved guiding end of the foil unit 22a. After the free run Wp the run of the paper web W is supported by the foil unit 25 provided with a guiding end 24 as well as by foil unit 24a, which is also provided with a curved guiding end 26 to guide the web. In this exemplifying ;;~
embodiment of the invention, the multicylinder dryer 40 is also .~
I.i,/, ,,j., ' " :, ,,,, , ., , ", . , ' . ' ~ ' ' ' ' .
2026~
provided with an airborne based paper web support device 41 for guiding and threading as well as for threading of the paper web. The lower wire in the multicylinder dryer 40 is denoted with the reference numeral 51.
Fig. 7 shows a paper web support device 41 for a multicylinder dryer 40, this support device being provided with a web detaching jet nozzle 42 and with foil nozzles 43. The chamber for equalization of excessive pressure is denoted with the reference numeral 44, and the nozzle used for conditioning of the nip is denoted with the reference numeral 45.
In the paper web guide system in accordance with the invention, the plural nozzle foil units with concurrent blowing pulls the paper web W and feeds it forwards. Owing to their nozzles with negative pressure, the guide devices also attract the paper web placed in their proximity. The threading in the cylinder part requires twin wire draw if it is desirable to use the paper web threading and guide device 41 in accordance with the invention in a multicylinder dryer. The device in accordance with the invention is as such not suitable for solutions with single wire draw.
In the following, the patent claims will be given, and the various details of the invention may show variations within the scope of the inventive idea defined in these claims.
,,~
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.
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Claims (17)
1. A method for drying a coated paper web in a coating machine, said method comprising the steps of:
threading and guiding said coated paper web into proximity with a gas drying device having a curved surface and a plurality of gas nozzles fitted in said surface and blowing air through said plurality of gas nozzles to support and guide said coated paper web at a substantially constant distance from said curved surface; and then guiding said coated paper web into a drying gap between two drying units each having a plurality of gas nozzles fitted in a surface thereof facing said gap and blowing air through said gas nozzles to support and guide said coated paper web between said two drying units.
threading and guiding said coated paper web into proximity with a gas drying device having a curved surface and a plurality of gas nozzles fitted in said surface and blowing air through said plurality of gas nozzles to support and guide said coated paper web at a substantially constant distance from said curved surface; and then guiding said coated paper web into a drying gap between two drying units each having a plurality of gas nozzles fitted in a surface thereof facing said gap and blowing air through said gas nozzles to support and guide said coated paper web between said two drying units.
2. The method of claim 1, further comprising threading and guiding said coated paper web from said drying gap into proximity with at least one more gas drying device having a curved surface and a plurality of gas nozzles fitted in said surface and blowing air through said plurality of gas nozzles to support and guide said coated paper web at a substantially constant distance from said gas surface; and then guiding said coated paper web into a drying gap between another two drying units each having a plurality of gas nozzles fitted in a surface thereof facing said gap and blowing air through said gas nozzles to support and guide said coated paper web between said two drying units.
3. The method of claim 1, further comprising lessening the intensity of said blowing of air when a leader of said web having less width than the rest of said web is being threaded.
4. The method of claim 2, further comprising guiding said coated paper web from said drying gap between said another two drying units to a first drying cylinder of a multicylinder drying unit, guiding said coated paper web around a portion of said first drying cylinder and then in a free draw to a second drying cylinder of said multicylinder drying unit, and guiding and supporting said coated paper web in said free draw by a paper web supporting device comprising a surface and a plurality of gas nozzles fitted in said surface, said paper web supporting device blowing air through said nozzles to support said coated paper web during said free draw.
5. An apparatus for drying a coated paper web in a coating machine, said apparatus comprising:
a gas drying device having a curved surface and a plurality of gas nozzles fitted in said surface which operates to provide jets of air through said nozzles such that a coated paper web brought into proximity with said device is supported and guided at a substantially constant distance from said curved surface;
two drying units forming a drying gap between each other and each having a plurality of gas nozzles fitted in a surface thereof facing said gap, said two drying units being positioned to receive in said drying gap said coated paper web from said gas driving device and functioning to blow jets of air through said gas nozzles such that said coated paper is supported and guided through said drying gap without any direct contact with said two drying units.
a gas drying device having a curved surface and a plurality of gas nozzles fitted in said surface which operates to provide jets of air through said nozzles such that a coated paper web brought into proximity with said device is supported and guided at a substantially constant distance from said curved surface;
two drying units forming a drying gap between each other and each having a plurality of gas nozzles fitted in a surface thereof facing said gap, said two drying units being positioned to receive in said drying gap said coated paper web from said gas driving device and functioning to blow jets of air through said gas nozzles such that said coated paper is supported and guided through said drying gap without any direct contact with said two drying units.
6. The apparatus of claim 5, wherein said drying units are either plural nozzle foil drying units.
7. The apparatus of claim 5, further comprising a second gas drying device having a curved surface and a plurality of gas nozzles fitted in said surface, said another gas drying device connected directly to an output end of one of said two drying units and functioning to provide jets of air to guide and support said coated paper web at a substantially constant distance from said curved surface drying gap.
8. The apparatus of claim 7, further comprising a third gas drying device situated in proximity to said second gas drying device, said third gas drying device having a curved surface and a plurality of gas nozzles fitted in said surface, said third gas drying device functioning to provide jets of air to guide and support said coated paper web at a substantially constant distance from said curved surface and said jets of air from said second gas drying device and from said third gas drying device functioning to support said coated paper web in a free draw as it passes from said second drying device to said third drying device.
9. The apparatus of claim 8, further comprising another two drying units forming a drying gap between each other and each having a plurality of gas nozzles fitted in a surface thereof facing said gap, said another two drying units directly connected to an output end of said third gas drying device and functioning to receive said coated paper web from said third drying device within said gap and to blow jets of air from said gas nozzles onto said coated paper web such that said coated paper web is supported and guided through said drying gap without any direct contact with said another two drying units.
10. The apparatus of claim 5, wherein said gas nozzles are negative pressure gas nozzles.
11. The apparatus of claim 5, further comprising said gas nozzles of said drying device and said drying units having means for regulating the size of their openings such that they can be set at a less than fully open position to thread a leader of said coated paper web, said leader having lesser width than the rest of said web.
12. The apparatus of claim 7, wherein said free draw is less than 2 meters in length.
13. The apparatus of claim 7, wherein said free draw is 0.5 meters to 1.5 meters in length.
14. An apparatus for drying a coated paper web in a coating machine, said apparatus comprising;
two drying units forming a drying gap between each other and each having a plurality of gas nozzles fitted in a surface thereof facing said gap, said two drying units being positioned to receive in said drying gap a coated paper web and functioning to blow jets of air such that said coated paper web is supported and guided through said drying gap without any direct contact with said two drying units;
a guide device having a curved surface and being fitted on an input end of one of said two drying units such that said coated paper web is guided into said drying gap, a second guide device having a curved surface and being fitted on an output end of one of said two drying units to guide said coated paper web as it leaves said drying gap;
a third guide device having a curved surface and being situated in proximity to said second guide device such that said coated paper web passes from said second guide device to said third guide device; and another two drying units forming a drying gap between each other and each having a plurality of gas nozzles in a surface thereof facing said gap, said third guide device being fitted on an input end of one of said another two drying units such that said coated paper web is guided into said drying gap, and said another two drying units functioning to blow jets of air such that said coated paper web is supported and guided through said drying gap without any direct contact with said two drying units.
two drying units forming a drying gap between each other and each having a plurality of gas nozzles fitted in a surface thereof facing said gap, said two drying units being positioned to receive in said drying gap a coated paper web and functioning to blow jets of air such that said coated paper web is supported and guided through said drying gap without any direct contact with said two drying units;
a guide device having a curved surface and being fitted on an input end of one of said two drying units such that said coated paper web is guided into said drying gap, a second guide device having a curved surface and being fitted on an output end of one of said two drying units to guide said coated paper web as it leaves said drying gap;
a third guide device having a curved surface and being situated in proximity to said second guide device such that said coated paper web passes from said second guide device to said third guide device; and another two drying units forming a drying gap between each other and each having a plurality of gas nozzles in a surface thereof facing said gap, said third guide device being fitted on an input end of one of said another two drying units such that said coated paper web is guided into said drying gap, and said another two drying units functioning to blow jets of air such that said coated paper web is supported and guided through said drying gap without any direct contact with said two drying units.
15. The apparatus of claim 14, further comprising a fourth guide device having a curved surface and being fitted on an output surface of one of said another two drying units to guide said coated paper as it leaves said gap between said another two drying units;
and a multicylinder dryer to which said coated paper web is guided from said fourth guide device.
and a multicylinder dryer to which said coated paper web is guided from said fourth guide device.
16. The apparatus of claim 15, wherein said multicylinder dryer comprises a first drying cylinder to which said coated paper is guided from said fourth guide element, a second drying cylinder to which said coated paper web passes from said first drying cylinder in a free draw, and a paper web supporting device having a substantially flat surface and a plurality of gas nozzles fitted in said substantially flat surface which operates to provide jets of air through said nozzles to guide and support said coated paper web during said free draw at a substantially constant distance from said flat surface.
17. The apparatus of claim 5, wherein said drying units are combined infrared and plural nozzle foil drying units.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI894515A FI894515A (en) | 1989-09-25 | 1989-09-25 | FOERFARANDE OCH ANORDNING FOER STYRNING AV EN PAPPERSBANA PAO EN BELAEGGNINGSMASKIN. |
| FI894515 | 1989-09-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2026098A1 true CA2026098A1 (en) | 1991-03-26 |
Family
ID=8529044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2026098 Abandoned CA2026098A1 (en) | 1989-09-25 | 1990-09-24 | Method and device for guiding the paper web in a coating machine |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH03130490A (en) |
| CA (1) | CA2026098A1 (en) |
| DE (1) | DE4029487A1 (en) |
| FI (1) | FI894515A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5771602A (en) * | 1995-10-25 | 1998-06-30 | Valmet Corporation | Method and device for drying a coating on a paper web or equivalent |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4110875A1 (en) * | 1991-04-04 | 1992-10-08 | Voith Gmbh J M | DRY LOT |
| EP0508253A1 (en) * | 1991-04-12 | 1992-10-14 | Van Brandwijk Systems Programming B.V. | Process and apparatus for heat treatment of a web having a fluid or paste-like composition applied to it |
| US5290504A (en) * | 1992-10-30 | 1994-03-01 | International Business Machines Corporation | Continuous air bearing vapor stabilization system and method |
| EP0643168B1 (en) * | 1993-08-07 | 1998-01-14 | J.M. Voith GmbH | Apparatus for coating a paper web |
| DE4416399C2 (en) * | 1994-05-09 | 1999-04-01 | Voith Gmbh J M | Drying device for a running material web |
| DE19732138A1 (en) * | 1996-08-26 | 1999-01-28 | Voith Sulzer Papiermasch Gmbh | Process for coating moving web of material with liquid or paste |
| DE19634448C2 (en) * | 1996-08-26 | 1999-06-24 | Voith Sulzer Papiermasch Gmbh | Method and device for applying a liquid or pasty medium to a running material web |
| FI108243B (en) * | 1997-01-27 | 2001-12-14 | Metso Paper Inc | Paper Coating Arrangement and Method for Coating Paper |
| FI104196B (en) * | 1998-03-03 | 1999-11-30 | Valmet Corp | Method and arrangement for coating a paper or board web of mobility |
| US6325896B1 (en) * | 1999-09-23 | 2001-12-04 | Valmet-Karlstad Ab | Apparatus for transferring a fast running fibrous web from a first location to a second location |
| US6634120B2 (en) | 2001-03-26 | 2003-10-21 | Voith Paper Patent Gmbh | Apparatus for coating moving fiber webs |
| EP1245732B1 (en) * | 2001-03-26 | 2007-07-18 | Voith Patent GmbH | Apparatus for coating moving webs, in particular paper webs and carton webs |
| DE10317372A1 (en) * | 2003-04-15 | 2004-11-04 | Voith Paper Patent Gmbh | Water extraction from a wet web, of paper or cardboard, deflects the fourdrinier/blanket into a loop path around a suction chamber by support and guide bars with sealing bars at the ends of the suction zone |
| DE10335580A1 (en) * | 2003-07-31 | 2005-02-24 | Voith Paper Patent Gmbh | Device for guiding a moving fibrous web |
| FI120368B (en) * | 2007-10-25 | 2009-09-30 | Metso Paper Inc | A method and arrangement for adjusting the properties of a fiber web |
| DE102008029432B3 (en) * | 2008-06-23 | 2009-09-17 | Prinovis Ltd. & Co. Kg | Drying system for continuous webs in the form of printed and / or coated paper webs |
-
1989
- 1989-09-25 FI FI894515A patent/FI894515A/en not_active Application Discontinuation
-
1990
- 1990-09-18 DE DE19904029487 patent/DE4029487A1/en not_active Withdrawn
- 1990-09-24 CA CA 2026098 patent/CA2026098A1/en not_active Abandoned
- 1990-09-25 JP JP25209390A patent/JPH03130490A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5771602A (en) * | 1995-10-25 | 1998-06-30 | Valmet Corporation | Method and device for drying a coating on a paper web or equivalent |
Also Published As
| Publication number | Publication date |
|---|---|
| FI894515A (en) | 1991-03-26 |
| JPH03130490A (en) | 1991-06-04 |
| FI894515A0 (en) | 1989-09-25 |
| DE4029487A1 (en) | 1991-04-04 |
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