WO2011134487A1 - Method for controlling a tension profile of a web and web tension profile control apparatus - Google Patents

Method for controlling a tension profile of a web and web tension profile control apparatus Download PDF

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Publication number
WO2011134487A1
WO2011134487A1 PCT/EP2010/055516 EP2010055516W WO2011134487A1 WO 2011134487 A1 WO2011134487 A1 WO 2011134487A1 EP 2010055516 W EP2010055516 W EP 2010055516W WO 2011134487 A1 WO2011134487 A1 WO 2011134487A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
tension profile
profiled
control apparatus
tension
Prior art date
Application number
PCT/EP2010/055516
Other languages
French (fr)
Inventor
Tatu PITKÄNEN
Heikki Kettunen
Kari Hasanen
Mika Viljanmaa
Markus Nylund
Original Assignee
Metso Paper, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Metso Paper, Inc. filed Critical Metso Paper, Inc.
Priority to PCT/EP2010/055516 priority Critical patent/WO2011134487A1/en
Priority to EP10718538A priority patent/EP2563700A1/en
Publication of WO2011134487A1 publication Critical patent/WO2011134487A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/022—Registering, tensioning, smoothing or guiding webs transversely by tentering devices
    • B65H23/025—Registering, tensioning, smoothing or guiding webs transversely by tentering devices by rollers
    • B65H23/0251—Registering, tensioning, smoothing or guiding webs transversely by tentering devices by rollers with a straight axis
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0066—Calenders; Smoothing apparatus using a special calendering belt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/514—Modifying physical properties
    • B65H2301/5143—Warming
    • B65H2301/51432—Applying heat and pressure

Definitions

  • the present invention relates to a method for controlling a tension profile of a web, like a paper or board web, and web tension profile control apparatus. Further, the present invention relates to a method for manufacturing a web including such a method for controlling a tension profile of a web and web manufacturing machine including such a web tension profile control apparatus.
  • a tension profile measuring roll wherein a web tension profile is measured by means of a spiral inclined pressure sensor film which contacts the web at an inclination (WO 2006/075055A1) .
  • a measuring roll is distributed under the name iRoll.
  • the present invention provides a method for controlling a tension profile of a web comprising the steps heating and pressure treating the web so as to plasticize the web, measuring the tension profile of the web, and profiled treatment of the web in accordance with the measured tension profile of the web in the width direction of the web using heat treatment or mechanical force.
  • Plasticizing the web means a plastication of the fibers of the web so as to enable a plastical deformation of the fibers .
  • Profiled treatment of the web in the width direction means an unequal or varied treatment of the web in the web cross direction perpendicular to the web conveying direction and perpendicular to the web thickness direction.
  • the amount of unequal or varied treatment depends on the measured tension profile .
  • a varied amount of heat is applied to the web in the web cross direction in accordance with the varied amount of the measured tension profile.
  • the measured tension profile is equal or constant, that is unvaried, in the web cross direction
  • an equal amount of heat is applied to the web or no heat is applied to the web.
  • a slack portion of the web that is an area with a low tension
  • the tension of a tight portion of the web is reduced by the use of a lower
  • Profiled treatment of the web using heat treatment can be profiled heat treating the web.
  • step profiled heat treating the web can be performed in the heating step.
  • the web is treated by means of heat in a profiled manner.
  • step profiled heat treating the web can be performed after the heating step, for example, by applying additional heat to respective portions of the web or by appropriately cooling respective portions of the web.
  • profiled heat treating the web can include heating as well as cooling respective portions of the web in the width direction of the web for obtaining a target temperature profile of the web in the width direction.
  • a varied mechanical force is applied to the web in accordance with the measured tension profile.
  • the mechanical force is provided to be at least in part directed in the web cross direction.
  • different mechanical forces in the web cross direction are applied in accordance with the different amount of tension at the respective position. Accordingly, in order to reduce slack portions of the web, the slack portions of the web are tightened more using a mechanical force pulling in the width direction of the web.
  • Profiled treatment of the web using a mechanical force can be profiled spreading the web.
  • slack edges of the web can be tensioned and obliqueness of the web can be compensated away.
  • the web can be a paper web or a board web.
  • the present inventors found that a plastication of fibers of a web by means of heat and pressure enables easily affecting the tension of the web and, thus the tension profile of the web without any use of moisture.
  • the present invention may also provide a control to receive a curved target tension profile.
  • the actual tension profile can be adjusted to any target tension profile.
  • the method for controlling a tension profile according to the present invention can be executed without any use of a moistening/dampening means.
  • the method is simplified and can be employed easily in existing web manufacturing processes.
  • this method can be additionally used by merely modifying the dry end of the board manufacturing process.
  • the profiled treatment of the web in accordance with the measured tension profile can be performed
  • the profiled treatment of the web can be conducted in sections that is stepwise / gradually.
  • the steps heating and pressure treating can be performed simultaneously. That is, the steps heating and pressure treating of the web are conducted substantially at the same time.
  • heating and pressure treating can be shifted with respect to each other in the web conveying direction.
  • one of heating and pressure treating could include a longer dwell time.
  • heating and pressure treating of the web are conducted in an overlapping manner in this case.
  • the step heating can be performed immediately before the step pressure treating, that is sufficiently close to the pressure treating step, so that the web is still
  • the method can be implemented in an existing web manufacturing process comprising an appropriate pressure treating step like a calendering step, so that only a heating step and a profiled treatment step have to be added.
  • the method can be implemented in an existing web manufacturing process, wherein the web still has an appropriate temperature, so that only a pressure treating step and a profiled treatment step have to be added.
  • the web can be preheated before the pressure treating step and can be heated supplementary during the pressure treating step.
  • the step measuring the tension profile can be performed downstream of the profiled treatment of the web.
  • control of the tension profile of the web can be performed by feedback-controlling the tension profile of the web .
  • the step measuring the tension profile can be performed upstream, i.e. before, the heating step, the pressure treating step or merely before the profiled treatment of the web.
  • the step pressure treating the web can be preferably performed by passing the web through a long treatment zone which may include a long nip.
  • the pressure treating using a long treatment zone can be formed by using a heat conductive belt and a counter roll.
  • the heat conductive belt can be a metal belt.
  • a method using any other long treatment zone may be used.
  • a long treatment zone provided between two heat conductive belts can be applied.
  • the two heat conductive belts i.e. two endless heat conductive belt loops
  • pressurized fluid may be supplied to pressure chambers of the pressing means for obtaining a target nip pressure.
  • the pressing means can apply pressure by means of rolls arranged on the inner sides of the heat conductive belt loops.
  • the dwell time can be increased by extending the length of the long treatment zone and/or by raising the conveyance speed of the web.
  • elements in contact with the web can be subjected to profiled heat treating in the width direction of the web in accordance with the measured tension profile for heating / heat treating the web.
  • any of the elements forming the long treatment zone can be subjected to profiled heat treating.
  • any of the elements forming the long treatment zone can be subjected to profiled heat treating.
  • Profiled heat treating of the elements can mean heating and cooling sections of the elements in accordance with the tension profile, that is in accordance with the intended effect on the tension profile.
  • the counter roll mentioned above can be subjected to profiled heat treating in the width direction of the counter roll, that is the width direction of the web, dependent on the measured tension profile.
  • sections of the counter roll corresponding to a measured low tension are heated more than sections of the counter roll corresponding to a measured high tension.
  • sections of the counter roll corresponding to a measured high tension are heated less than sections of the counter roll corresponding to a measured low tension, or the sections of the counter roll corresponding to a
  • the heat conductive belt can be subjected to profiled heat treating in the width direction of the web in accordance with the measured tension profile. Accordingly, the heat conductive belt is heat treated in the width direction of the conductive belt, that is the width
  • sections of the heat conductive belt corresponding to a measured low tension of the web are heated more than sections of the heat conductive belt corresponding to a measured high tension of the web.
  • both of heat treating the counter roll and heat treating the heat conductive belt can be performed.
  • profiled heat treating can be performed by blowing hot air and/or cold air on a surface of the respective elements in accordance with the tension profile. For instance, the lower the measured tension of a section of the web the larger the amount of hot air blown on the outer surface of the corresponding section of the counter roll or the heat conductive belt.
  • the respective elements can be heat treated by generating induction current within these elements in accordance with the tension profile, that is in accordance with the intended effect on the tension profile. For instance, the lower the measured tension of the respective portion of the web the larger the amount of induction current generated in the corresponding section of the element.
  • the pressure chambers for applying pressure on a metal belt as described above can be partitioned in the web cross direction and can be supplied with pressurized fluid heat treated in accordance with the measured tension profile.
  • the profiled treatment is performed after the steps heating and pressure treating by passing the web over a spreader roll and actuating sections of the spreader roll in
  • the spreader roll generates a mechanical force pulling the web in the width direction of the web.
  • the spreader roll can have several actuators for actuating the sections of the spreader roll in accordance with the measured tension profile. For instance, the lower the measured tension of a section of the web the more the actuator of the corresponding section of the spreader roll is actuated so as to pull the web in the width direction of the web .
  • the tension profile can be measured online.
  • the present invention provides a method for manufacturing a web comprising the steps drying a web, controlling a tension profile of the web after the drying step in accordance with the method for controlling a tension profile as described above, and passing the web to a further treatment like reeling-up the web after
  • a web tension profile control apparatus is provided
  • profiled treatment means adapted to treat the web in the width direction of the web in accordance with a measured tension profile by profiled actuation of a profilable heat treating means or profiled actuation of a profilable spreading means.
  • a profiled heat treating means is adapted to apply a varied amount of heat to the web in the web cross direction in accordance with the varied amount of the measured tension profile.
  • the web heating means and the heat treating means can be provided integral with each other.
  • profilable heat treating means can be provided downstream of the web heating means.
  • the profilable heat treating means can be adapted to heat as well as to cool respective portions of the web in the width direction of the web for obtaining a target
  • the spreading means is adapted to apply a varied amount of a mechanical force to the web in accordance with the measured tension profile.
  • the mechanical force is provided to be at least in part directed in the web cross direction.
  • the spreading means is adapted to apply at different positions in the web cross direction different mechanical forces in the web cross direction in accordance with the different amount of tension at the respective position.
  • profilable heat treating means and profilable spreading means can be provided adapted to control the tension profile of the web.
  • the web heating means can be formed integral with the pressure treating means.
  • the web heating means can be provided
  • the tension profile measuring means is arranged downstream of the profiled treatment means .
  • the tension profile control apparatus can be adapted to feedback control the tension profile of the web.
  • the pressure treating means may comprise a long treatment zone.
  • the long treatment zone can be formed between a heat conductive belt and a counter roll. Further, the long treatment zone can be formed between two heat conductive belts. Also, the long treatment zone may be formed between a shoe roll or soft roll and a counter roll.
  • the heat conductive belt can be a metal belt.
  • the heat treating means can be adapted to perform profiled heating of elements in contact with the web for profiled heat treating the web.
  • the heat treating means can be a profilable hot air-blow device.
  • the heat treating means can be a profilable hot air-blow device.
  • the heat treating means can be a profilable induction heating device.
  • the profiled treatment means can comprise a spreader roll as a spreading means arranged downstream of the heating means and the pressure treating means, and is adapted to actuate the spreader roll in accordance with the measured tension profile.
  • the present invention provides a web
  • Fig. 1 shows the structure of a web tension profile control apparatus according to a first embodiment of the present invention .
  • Fig. 2 shows a structure of a web tension profile control apparatus according to a second embodiment according to the present invention.
  • Fig. 3 shows a structure of a web tension profile control apparatus according to a third embodiment according to the present invention.
  • Fig. 4 shows a structure of a web tension profile control apparatus according to a fourth embodiment according to the present invention.
  • the tension profile control apparatus comprises a metal belt arrangement 5 as a web heating means and pressure treating means including a long nip 6 as a long treatment zone.
  • the long nip 6 is formed by an endless metal belt 9 as a heat conductive belt supported by rolls 13 and 15 and a counter roll 11 arranged opposed to the metal belt 9.
  • the metal belt 9 is arranged so as to follow at least partly the outer circumference of the counter roll 11.
  • the metal belt 9 is arranged on an upper side of a web 1 and the counter roll 11 is arranged on a lower side of the web 1, so that the web 1 is nipped in the long nip 6 between the metal belt 9 and the counter roll 11.
  • a profilable induction heating device 3 as a combined heating means and heat treating means according to the present invention is provided opposed to the counter roll 11.
  • the profilable induction heating device 3 is adapted to heat the surface layer of the counter roll 11 variably in the width direction of the counter roll 11.
  • a tension profile measurement roll 7 as a tension profile measuring means is provided downstream of the long nip 6, being adapted to measure the tension profile in the width direction of the web.
  • the first embodiment comprises a controller 8 connected with the tension profile measurement roll 7 as well as with the profilable induction heating device 3.
  • the controller 8, the profilable induction heating device 3 and the tension profile measurement roll 7 form a profiled treatment means according to the first embodiment of the present invention.
  • the controller 8 receives measurement data from the tension profile measurement roll 7 and is adapted to control the profilable induction heating device 3 in accordance with the measured tension profile.
  • the controller 8 effects that the profilable induction heating device 3 heats the surface of the counter roll 11 in the width direction of the counter roll 11 with varied power to approach the actual tension profile of the web to a target tension profile of the web .
  • the heated counter roll 11 heats the web 1 in a profiled manner when being pressure treated in contact with the web 1 in the long nip 6.
  • the fibers of the web are plasticized in a profiled manner.
  • plastication of the fibers of the web is affected by the dwell time of the web 1 in the long nip 6.
  • the plastication can be influenced by the web speed and the length of the long nip 6. Further, the amount of heat affects the plastication of the web 1.
  • the web 1 is heated in accordance with the tension profile measured by the tension profile measurement roll 7 that is in accordance with the deviation of the actual tension profile measured by the tension profile measurement roll 7 from a target tension profile.
  • portions of the web 1 comprising a low tension are heated more - and thus tightened more - than portions of the web 1 comprising a high tension.
  • the web tension profile control apparatus can be easily attached to the dry end of an existing paper or board machine previous to reeling-up the web or any other further treatment of the web without the requirement of profiled moistening for controlling the tension profile.
  • a web tension profile control apparatus and a corresponding method according to a second embodiment of the present invention are described with reference to Fig. 2.
  • the tension profile control apparatus includes a metal belt arrangement 5 formed by an endless metal belt 9 and a counter roll 11 arranged opposed to the metal belt 9.
  • the metal belt 9 and the counter roll 11 form a long nip 6 as a long treatment zone.
  • the counter roll 11 is adapted to be heated uniformly, so that the counter roll 11 forms a web heating means according to the present invention.
  • the metal belt 9 or one or both of the rolls 13 and 15 supporting the metal belt 9 can be heated.
  • the tension profile control apparatus comprises a tension profile measurement roll 7 as a tension profile measuring means.
  • a spreader roll 17 is provided downstream of the metal belt arrangement 5.
  • the spreader roll includes actuators in the width direction thereof in order to spread the web in the width direction by applying a force at least partly in the width direction of the web.
  • the spreader roll 17 is composed of several sections in the width direction, wherein the alignment of the rotational axes of the sections can be controlled individually.
  • the obliqueness of a tension profile can be straightened by turning the spreader roll 17 or sections of the spreader roll 17 equivalently oblique.
  • a controller 8 is provided receiving the
  • the controller 8 compares the measured tension profile of the tension profile measurement roll 7 with a target tension profile and controls the spreader roll 17 that is the several sections of the spreader roll 17 in accordance with the deviation of the actual tension profile from the target tension profile.
  • the controller 8, the tension profile measurement roll 7 and the spreader roll 17 form a profiled treatment means according to the second embodiment of the present
  • controller 8 can be omitted and the spreader roll 17 can be actuated manually.
  • a nip roll 19 is provided between the spreader roll and the tension profile measurement roll 7 and the web is guided around the nip roll 19.
  • the metal belt arrangement 5 with a heating function provides a sufficient plastication of the web facilitating a permanent change of the tension profile by means of the spreader roll 17.
  • the spreader roll 17 applies a force component in the width direction of the web 1 in accordance with the target tension profile of the web to tighten slack portions of the web .
  • the web tension profile control apparatus comprises a metal belt calender 50 as a pressure treating means including a long nip 6 as a long treatment zone.
  • An endless metal belt 9 as a heat conductive belt is supported by rolls 13, 15 and 23 and a counter roll 11 arranged opposed to the metal belt 9.
  • the metal belt 9 is arranged on a lower side of a web 1 and the counter roll 11 is arranged on an upper side of the web 1.
  • a pressure roll 21 arranged in contact with an inner side of the metal belt loop is provided for applying additional pressure on the web 1 within the long nip 6.
  • the web 1 runs via a guide roll 25 into the long nip 6. Downstream the long nip 6, the web is guided by means of a guide roll 27 to the tension profile measurement roll 7.
  • a control of the tension profile of the web is conducted similar to the first embodiment by profiled heating the counter roll 11 being a thermo roll as a combined heating means and heat treating means in accordance with the present invention using a controller 8. Moreover, the metal belt 9 can be subjected to profiled heating using the controller 8.
  • the tension profile control apparatus comprises a metal belt arrangement 500.
  • a metal belt loop formed by a metal belt 9 and two rolls 13 and 15 as well as a metal belt loop formed by a metal belt 10 and two rolls 14 and 16 are arranged opposed to each other forming a long nip 6 as a long treatment zone.
  • Pressure chambers 31 and 32 are provided on the inner side of the metal belts 9 and 10, respectively.
  • the pressure chambers 31 and 32 are supplied with pressurized fluid so as to press the metal belts to each other forming an appropriate nip pressure.
  • the pressure chambers 31 and 32 form a pressure treating means in accordance with the present invention.
  • a profilable heating device is provided integral with the roll 14 as a combined heating means and heat treating means in accordance with the present invention.
  • the metal belt 10 can be heated in a profiled manner in the width direction of the web 1.
  • a further profilable heating device can be integrated within the roll 13.
  • other means for subjecting the metal belts 9 and 10 to profiled heat treating could be implemented.
  • measurement roll 7 is provided downstream the metal belt arrangement 500.
  • the fourth embodiment comprises a controller 8 connected with the tension profile measurement roll 7 as well as with the profilable heating device of the roll 14.
  • the controller 8, the profilable heating device of the roll 14 and the tension profile measurement roll 7 form a profiled treatment means according to the fourth embodiment of the present invention.
  • controller 8 controls the profilable heating device based on the

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Abstract

The present invention relates to a method for controlling a tension profile of a web comprising the steps heating and calendering the web so as to plasticize the web, measuring the tension profile of the web, and profiled treatment of the web in accordance with the measured tension profile of the web in the width direction of the web by profiled heat treating the web or/and profiled application of a mechanical force. Further, the present invention relates to a corresponding web tension profile control apparatus.

Description

Method for controlling a tension profile of a web and web tension profile control apparatus
The present invention relates to a method for controlling a tension profile of a web, like a paper or board web, and web tension profile control apparatus. Further, the present invention relates to a method for manufacturing a web including such a method for controlling a tension profile of a web and web manufacturing machine including such a web tension profile control apparatus.
Heretofore, online control methods for affecting the tension profile of a paper or board web are known, wherein moistening/dampening is used. In particular, a steam box has been used in a press section of a paper/board machine or a dampening device has been used in a dryer section of a paper/board machine for profiled moistening in order to affect the tension profile of the paper/board web in the width direction of the web.
Further, a tension profile measuring roll is known, wherein a web tension profile is measured by means of a spiral inclined pressure sensor film which contacts the web at an inclination (WO 2006/075055A1) . Such a measuring roll is distributed under the name iRoll.
It is the object of the present invention to provide a method for controlling a tension profile of a web and a web tension profile control apparatus, wherein the control of the tension profile is simplified and can be easily
implemented at the dry end of a web manufacturing machine. This object is achieved with a method for controlling a tension profile of a web and web tension profile control apparatus, respectively, comprising the features of the independent claims.
Further developments are set forth in the dependent claims.
In particular, according to a first aspect, the present invention provides a method for controlling a tension profile of a web comprising the steps heating and pressure treating the web so as to plasticize the web, measuring the tension profile of the web, and profiled treatment of the web in accordance with the measured tension profile of the web in the width direction of the web using heat treatment or mechanical force.
Plasticizing the web means a plastication of the fibers of the web so as to enable a plastical deformation of the fibers .
Profiled treatment of the web in the width direction means an unequal or varied treatment of the web in the web cross direction perpendicular to the web conveying direction and perpendicular to the web thickness direction. The amount of unequal or varied treatment depends on the measured tension profile .
In particular, as a first alternative, a varied amount of heat is applied to the web in the web cross direction in accordance with the varied amount of the measured tension profile. Of course, in case the measured tension profile is equal or constant, that is unvaried, in the web cross direction, an equal amount of heat is applied to the web or no heat is applied to the web. Accordingly, a slack portion of the web, that is an area with a low tension, is tightened by the use of a higher temperature. In turn, the tension of a tight portion of the web, that is an area with a high tension, is reduced by the use of a lower
temperature .
Profiled treatment of the web using heat treatment can be profiled heat treating the web.
Further, the step profiled heat treating the web can be performed in the heating step. In other words, when heating the web in the heating step, at the same time the web is treated by means of heat in a profiled manner.
Also, the step profiled heat treating the web can be performed after the heating step, for example, by applying additional heat to respective portions of the web or by appropriately cooling respective portions of the web.
Thus, profiled heat treating the web can include heating as well as cooling respective portions of the web in the width direction of the web for obtaining a target temperature profile of the web in the width direction.
As a second alternative, a varied mechanical force is applied to the web in accordance with the measured tension profile. In particular, the mechanical force is provided to be at least in part directed in the web cross direction. In other words, at different positions in the web cross direction different mechanical forces in the web cross direction are applied in accordance with the different amount of tension at the respective position. Accordingly, in order to reduce slack portions of the web, the slack portions of the web are tightened more using a mechanical force pulling in the width direction of the web. Profiled treatment of the web using a mechanical force can be profiled spreading the web.
The above first and second alternative of the first aspect of the present invention can be combined, that is both of profiled heat treating the web and profiled spreading the web can be performed when controlling the tension profile of the web.
In accordance with the first and second alternative of the present invention, slack edges of the web can be tensioned and obliqueness of the web can be compensated away.
The web can be a paper web or a board web.
The present inventors found that a plastication of fibers of a web by means of heat and pressure enables easily affecting the tension of the web and, thus the tension profile of the web without any use of moisture. In
particular, they found that a profiled heat treatment or a profiled treatment with mechanical forces in the web cross direction permits the homogenization of the tension profile in the web cross direction. Of course, besides a
homogenized or even target tension profile, the present invention may also provide a control to receive a curved target tension profile. Thus, according the invention, the actual tension profile can be adjusted to any target tension profile.
The same applies to the profiled provision of a mechanical force in the web cross direction enabling controlling the actual tension profile to any target tension profile.
The method for controlling a tension profile according to the present invention can be executed without any use of a moistening/dampening means. Thus, the method is simplified and can be employed easily in existing web manufacturing processes. In particular, in existing board manufacturing processes comprising no moistening/dampening means this method can be additionally used by merely modifying the dry end of the board manufacturing process.
Further, the profiled treatment of the web in accordance with the measured tension profile can be performed
continuously in the web cross direction.
Thus, a very smooth and accurate tension profile can be achieved .
Alternatively, the profiled treatment of the web can be conducted in sections that is stepwise / gradually.
Thus, the complexity of the control is reduced.
Further, in the method according to the present invention the steps heating and pressure treating can be performed simultaneously. That is, the steps heating and pressure treating of the web are conducted substantially at the same time. As a matter of course, heating and pressure treating can be shifted with respect to each other in the web conveying direction. Further, one of heating and pressure treating could include a longer dwell time. Thus, at least, heating and pressure treating of the web are conducted in an overlapping manner in this case.
Thus, the process is very compact and a heat loss in view of the intended plastication is reduced.
Further, in the method according to the present invention, the step heating can be performed immediately before the step pressure treating, that is sufficiently close to the pressure treating step, so that the web is still
sufficiently heated when being treated by means of
pressure .
Thus, the method can be implemented in an existing web manufacturing process comprising an appropriate pressure treating step like a calendering step, so that only a heating step and a profiled treatment step have to be added. On the other hand, the method can be implemented in an existing web manufacturing process, wherein the web still has an appropriate temperature, so that only a pressure treating step and a profiled treatment step have to be added.
Also, the web can be preheated before the pressure treating step and can be heated supplementary during the pressure treating step.
Moreover, in the method according to the present invention the step measuring the tension profile can be performed downstream of the profiled treatment of the web.
Further, when performing the step measuring the tension profile downstream of the profiled treatment of the web, the control of the tension profile of the web can be performed by feedback-controlling the tension profile of the web .
Thus, an improved accuracy of the adjustment of the actual tension profile to become the target tension profile can be obtained .
Alternatively, the step measuring the tension profile can be performed upstream, i.e. before, the heating step, the pressure treating step or merely before the profiled treatment of the web.
Further, in the method according to the present invention the step pressure treating the web can be preferably performed by passing the web through a long treatment zone which may include a long nip.
The pressure treating using a long treatment zone can be formed by using a heat conductive belt and a counter roll.
The heat conductive belt can be a metal belt.
As an alternative with respect to passing the web trough a long treatment zone formed by a heat conductive belt and a counter roll, a method using any other long treatment zone may be used. For example, a long treatment zone provided between two heat conductive belts can be applied.
For example, the two heat conductive belts, i.e. two endless heat conductive belt loops, can be pressed by pressing means arranged on the inner sides of the heat conductive belt loops to each other. More specifically, pressurized fluid may be supplied to pressure chambers of the pressing means for obtaining a target nip pressure. Alternatively or in addition, the pressing means can apply pressure by means of rolls arranged on the inner sides of the heat conductive belt loops.
Further, it is conceivable to pass the web trough a long treatment zone formed by a shoe roll or a soft roll and a respective counter roll.
The inventors found that the dwell time of heating and pressure treating is important in view of the amount of plastication of the web. Thus, any long treatment zone applying pressure over a sufficiently long time / distance considering the web conveyance speed is appropriate. The dwell time can be increased by extending the length of the long treatment zone and/or by raising the conveyance speed of the web.
Further, in the method according to the present invention, elements in contact with the web can be subjected to profiled heat treating in the width direction of the web in accordance with the measured tension profile for heating / heat treating the web.
For example, any of the elements forming the long treatment zone can be subjected to profiled heat treating. In
particular, any of the elements forming the long treatment zone can be subjected to profiled heat treating. Profiled heat treating of the elements can mean heating and cooling sections of the elements in accordance with the tension profile, that is in accordance with the intended effect on the tension profile.
In particular, the counter roll mentioned above can be subjected to profiled heat treating in the width direction of the counter roll, that is the width direction of the web, dependent on the measured tension profile. For
instance, sections of the counter roll corresponding to a measured low tension are heated more than sections of the counter roll corresponding to a measured high tension. In turn, sections of the counter roll corresponding to a measured high tension are heated less than sections of the counter roll corresponding to a measured low tension, or the sections of the counter roll corresponding to a
measured high tension are cooled more than sections of the counter roll corresponding to a measured high tension. Alternatively, in the method according to the present invention the heat conductive belt can be subjected to profiled heat treating in the width direction of the web in accordance with the measured tension profile. Accordingly, the heat conductive belt is heat treated in the width direction of the conductive belt, that is the width
direction of the web, dependent on the measured tension profile. For instance, sections of the heat conductive belt corresponding to a measured low tension of the web are heated more than sections of the heat conductive belt corresponding to a measured high tension of the web.
Also, both of heat treating the counter roll and heat treating the heat conductive belt can be performed.
According to the present invention profiled heat treating can be performed by blowing hot air and/or cold air on a surface of the respective elements in accordance with the tension profile. For instance, the lower the measured tension of a section of the web the larger the amount of hot air blown on the outer surface of the corresponding section of the counter roll or the heat conductive belt.
Alternatively or additionally, the respective elements can be heat treated by generating induction current within these elements in accordance with the tension profile, that is in accordance with the intended effect on the tension profile. For instance, the lower the measured tension of the respective portion of the web the larger the amount of induction current generated in the corresponding section of the element.
Further, when using pressing means within a heat conductive belt loop as described above, the pressure chambers for applying pressure on a metal belt as described above can be partitioned in the web cross direction and can be supplied with pressurized fluid heat treated in accordance with the measured tension profile.
Further, in the method according to the present invention, the profiled treatment is performed after the steps heating and pressure treating by passing the web over a spreader roll and actuating sections of the spreader roll in
accordance with the measured tension profile.
The spreader roll generates a mechanical force pulling the web in the width direction of the web. In particular, the spreader roll can have several actuators for actuating the sections of the spreader roll in accordance with the measured tension profile. For instance, the lower the measured tension of a section of the web the more the actuator of the corresponding section of the spreader roll is actuated so as to pull the web in the width direction of the web .
Further, in the method according to the present invention, the tension profile can be measured online.
All of the above described further developments of the method according to the present invention can be combined with each other where appropriate.
Further, the present invention provides a method for manufacturing a web comprising the steps drying a web, controlling a tension profile of the web after the drying step in accordance with the method for controlling a tension profile as described above, and passing the web to a further treatment like reeling-up the web after
controlling the tension profile of the web. According to a second aspect of the present invention, a web tension profile control apparatus is provided
comprising web heating means and pressure treating means, tension profile measuring means adapted to measure the tension profile of the web, and profiled treatment means adapted to treat the web in the width direction of the web in accordance with a measured tension profile by profiled actuation of a profilable heat treating means or profiled actuation of a profilable spreading means.
In particular, as a first alternative of the second aspect of the invention, a profiled heat treating means is adapted to apply a varied amount of heat to the web in the web cross direction in accordance with the varied amount of the measured tension profile.
Further, the web heating means and the heat treating means can be provided integral with each other.
Also, the profilable heat treating means can be provided downstream of the web heating means.
The profilable heat treating means can be adapted to heat as well as to cool respective portions of the web in the width direction of the web for obtaining a target
temperature profile of the web in the width direction.
As a second alternative of the second aspect of the present invention, the spreading means is adapted to apply a varied amount of a mechanical force to the web in accordance with the measured tension profile. In particular, the mechanical force is provided to be at least in part directed in the web cross direction. In other words, the spreading means is adapted to apply at different positions in the web cross direction different mechanical forces in the web cross direction in accordance with the different amount of tension at the respective position.
The above first and second alternative of the second aspect of the invention can be combined, that is both of
profilable heat treating means and profilable spreading means can be provided adapted to control the tension profile of the web.
Further, in the web tension profile control apparatus according to the present invention the web heating means can be formed integral with the pressure treating means. Alternatively the web heating means can be provided
immediately upstream of the pressure treating means.
Further, in the tension profile control apparatus according to the present invention, the tension profile measuring means is arranged downstream of the profiled treatment means .
Further, according to the present invention, the tension profile control apparatus can be adapted to feedback control the tension profile of the web.
Furthermore, in the tension profile control apparatus according to the present invention, the pressure treating means may comprise a long treatment zone.
Further, in the tension profile control apparatus according to the present invention, the long treatment zone can be formed between a heat conductive belt and a counter roll. Further, the long treatment zone can be formed between two heat conductive belts. Also, the long treatment zone may be formed between a shoe roll or soft roll and a counter roll. The heat conductive belt can be a metal belt.
Further, in the web tension profile control apparatus according to the present invention, the heat treating means can be adapted to perform profiled heating of elements in contact with the web for profiled heat treating the web.
Further, in the tension profile control apparatus according to the present invention, the heat treating means can be a profilable hot air-blow device. Alternatively or in
addition, the heat treating means can be a profilable induction heating device.
Further, in the tension profile control apparatus according to the present invention, the profiled treatment means can comprise a spreader roll as a spreading means arranged downstream of the heating means and the pressure treating means, and is adapted to actuate the spreader roll in accordance with the measured tension profile.
All of the above described further developments of the apparatus according to the present invention can be
combined with each other where appropriate.
Moreover, the present invention provides a web
manufacturing machine comprising a drying section, a web tension profile control apparatus as described above and a further section like a reel-up section, wherein the tension profile control device is arranged at the dry end of the paper machine subsequent to the drying section and previous to the further section. Fig. 1 shows the structure of a web tension profile control apparatus according to a first embodiment of the present invention .
Fig. 2 shows a structure of a web tension profile control apparatus according to a second embodiment according to the present invention.
Fig. 3 shows a structure of a web tension profile control apparatus according to a third embodiment according to the present invention.
Fig. 4 shows a structure of a web tension profile control apparatus according to a fourth embodiment according to the present invention.
In the following a tension profile control apparatus and a corresponding method according to a first embodiment of the present invention are described with reference to Fig. 1.
The tension profile control apparatus according to the first embodiment of the present invention comprises a metal belt arrangement 5 as a web heating means and pressure treating means including a long nip 6 as a long treatment zone. The long nip 6 is formed by an endless metal belt 9 as a heat conductive belt supported by rolls 13 and 15 and a counter roll 11 arranged opposed to the metal belt 9. In particular, the metal belt 9 is arranged so as to follow at least partly the outer circumference of the counter roll 11. In this embodiment, the metal belt 9 is arranged on an upper side of a web 1 and the counter roll 11 is arranged on a lower side of the web 1, so that the web 1 is nipped in the long nip 6 between the metal belt 9 and the counter roll 11. Further, a profilable induction heating device 3 as a combined heating means and heat treating means according to the present invention is provided opposed to the counter roll 11. In particular, the profilable induction heating device 3 is adapted to heat the surface layer of the counter roll 11 variably in the width direction of the counter roll 11.
Downstream of the long nip 6, a tension profile measurement roll 7 as a tension profile measuring means is provided being adapted to measure the tension profile in the width direction of the web.
Further, the web tension profile control apparatus
according to the first embodiment comprises a controller 8 connected with the tension profile measurement roll 7 as well as with the profilable induction heating device 3.
The controller 8, the profilable induction heating device 3 and the tension profile measurement roll 7 form a profiled treatment means according to the first embodiment of the present invention.
During operation, the controller 8 receives measurement data from the tension profile measurement roll 7 and is adapted to control the profilable induction heating device 3 in accordance with the measured tension profile. In other words, dependant on the measured tension profile that is the actual tension profile, the controller 8 effects that the profilable induction heating device 3 heats the surface of the counter roll 11 in the width direction of the counter roll 11 with varied power to approach the actual tension profile of the web to a target tension profile of the web . As a result of being heated the heated counter roll 11 heats the web 1 in a profiled manner when being pressure treated in contact with the web 1 in the long nip 6. Thus, the fibers of the web are plasticized in a profiled manner.
Besides the temperature/heat amount, the amount of
plastication of the fibers of the web is affected by the dwell time of the web 1 in the long nip 6. Thus, the plastication can be influenced by the web speed and the length of the long nip 6. Further, the amount of heat affects the plastication of the web 1.
Thus, the web 1 is heated in accordance with the tension profile measured by the tension profile measurement roll 7 that is in accordance with the deviation of the actual tension profile measured by the tension profile measurement roll 7 from a target tension profile.
In particular, portions of the web 1 comprising a low tension are heated more - and thus tightened more - than portions of the web 1 comprising a high tension.
Thus, during operation of the web tension profile control apparatus the tension profile of the web 1 can be
controlled based on the actual tension profile measured by the tension profile measurement roll 7 to approach a target tension profile.
The web tension profile control apparatus can be easily attached to the dry end of an existing paper or board machine previous to reeling-up the web or any other further treatment of the web without the requirement of profiled moistening for controlling the tension profile. In the following, a web tension profile control apparatus and a corresponding method according to a second embodiment of the present invention are described with reference to Fig. 2.
Similar to the web tension profile control apparatus according to the first embodiment, the tension profile control apparatus according to the second embodiment includes a metal belt arrangement 5 formed by an endless metal belt 9 and a counter roll 11 arranged opposed to the metal belt 9. The metal belt 9 and the counter roll 11 form a long nip 6 as a long treatment zone.
For plastication of the web, the counter roll 11 is adapted to be heated uniformly, so that the counter roll 11 forms a web heating means according to the present invention.
Alternatively, the metal belt 9 or one or both of the rolls 13 and 15 supporting the metal belt 9 can be heated.
The tension profile control apparatus according to the second embodiment comprises a tension profile measurement roll 7 as a tension profile measuring means.
Further, downstream of the metal belt arrangement 5, a spreader roll 17 is provided. The spreader roll includes actuators in the width direction thereof in order to spread the web in the width direction by applying a force at least partly in the width direction of the web. In particular, the spreader roll 17 is composed of several sections in the width direction, wherein the alignment of the rotational axes of the sections can be controlled individually.
For example, the obliqueness of a tension profile can be straightened by turning the spreader roll 17 or sections of the spreader roll 17 equivalently oblique. Further, a controller 8 is provided receiving the
measurement data from the tension profile measurement roll 7. The controller 8 compares the measured tension profile of the tension profile measurement roll 7 with a target tension profile and controls the spreader roll 17 that is the several sections of the spreader roll 17 in accordance with the deviation of the actual tension profile from the target tension profile.
The controller 8, the tension profile measurement roll 7 and the spreader roll 17 form a profiled treatment means according to the second embodiment of the present
invention .
Alternatively, the controller 8 can be omitted and the spreader roll 17 can be actuated manually.
Besides, a nip roll 19 is provided between the spreader roll and the tension profile measurement roll 7 and the web is guided around the nip roll 19.
Accordingly, in view of the second embodiment of the present invention, the metal belt arrangement 5 with a heating function provides a sufficient plastication of the web facilitating a permanent change of the tension profile by means of the spreader roll 17. In particular, the spreader roll 17 applies a force component in the width direction of the web 1 in accordance with the target tension profile of the web to tighten slack portions of the web .
In the following a web tension profile control apparatus and a corresponding method according to a third embodiment of the present invention are described with reference to Fig. 3.
The web tension profile control apparatus according to the third embodiment of the present invention comprises a metal belt calender 50 as a pressure treating means including a long nip 6 as a long treatment zone. An endless metal belt 9 as a heat conductive belt is supported by rolls 13, 15 and 23 and a counter roll 11 arranged opposed to the metal belt 9. In this embodiment, the metal belt 9 is arranged on a lower side of a web 1 and the counter roll 11 is arranged on an upper side of the web 1. Further, a pressure roll 21 arranged in contact with an inner side of the metal belt loop is provided for applying additional pressure on the web 1 within the long nip 6.
The web 1 runs via a guide roll 25 into the long nip 6. Downstream the long nip 6, the web is guided by means of a guide roll 27 to the tension profile measurement roll 7.
A control of the tension profile of the web is conducted similar to the first embodiment by profiled heating the counter roll 11 being a thermo roll as a combined heating means and heat treating means in accordance with the present invention using a controller 8. Moreover, the metal belt 9 can be subjected to profiled heating using the controller 8.
In the following a web tension profile control apparatus and a corresponding method according to a fourth embodiment of the present invention are described with reference to Fig. 4.
The tension profile control apparatus according to the fourth embodiment of the present invention comprises a metal belt arrangement 500. A metal belt loop formed by a metal belt 9 and two rolls 13 and 15 as well as a metal belt loop formed by a metal belt 10 and two rolls 14 and 16 are arranged opposed to each other forming a long nip 6 as a long treatment zone.
Pressure chambers 31 and 32 are provided on the inner side of the metal belts 9 and 10, respectively. The pressure chambers 31 and 32 are supplied with pressurized fluid so as to press the metal belts to each other forming an appropriate nip pressure. Thus, the pressure chambers 31 and 32 form a pressure treating means in accordance with the present invention.
A profilable heating device is provided integral with the roll 14 as a combined heating means and heat treating means in accordance with the present invention. Thus, the metal belt 10 can be heated in a profiled manner in the width direction of the web 1. Also, a further profilable heating device can be integrated within the roll 13. In addition or alternatively, other means for subjecting the metal belts 9 and 10 to profiled heat treating could be implemented.
Similar to the first embodiment, a tension profile
measurement roll 7 is provided downstream the metal belt arrangement 500.
Further, the web tension profile control apparatus
according to the fourth embodiment comprises a controller 8 connected with the tension profile measurement roll 7 as well as with the profilable heating device of the roll 14.
The controller 8, the profilable heating device of the roll 14 and the tension profile measurement roll 7 form a profiled treatment means according to the fourth embodiment of the present invention.
Similar to the first and third embodiment, the controller 8 controls the profilable heating device based on the
measurement data received from the tension profile
measurement roll 7 and thus controls the actual tension profile of the web 1 to approach a target tension profile.

Claims

Claims
1. Method for controlling a tension profile of a web comprising the steps
heating and pressure treating the web so as to
plasticize the web;
measuring the tension profile of the web; and
profiled treatment of the web in accordance with the measured tension profile of the web in the width direction of the web by profiled heat treating the web or/and
profiled spreading the web.
2. Method according to claim 1, wherein the steps heating and pressure treating are performed simultaneously or the step heating is performed immediately before the step pressure treating.
3. Method according to claims 1 or 2, wherein the step measuring the tension profile is performed online
downstream of the profiled treatment of the web so as to feedback-control the tension profile of the web.
4. Method according to any of claims 1 to 3, wherein the step pressure treating is performed by passing the web through a long treatment zone which is for example formed between a heat conductive belt and a counter roll.
5. Method according to any of claims 1 to 4, wherein, before or during the step pressure treating the web, elements in contact with the web are subjected to profiled heat treating in the width direction of the web in
accordance with the measured tension profile for profiled heat treating the web, for example by profiled blowing of hot air on the elements or by profiled induction heating of the elements.
6. Method according to any of claims 1 to 5, wherein the step profiled treatment is performed after the steps heating and pressure treating by passing the web over a spreader roll and actuating sections of the spreader roll in accordance with the measured tension profile.
7. Method for manufacturing a web comprising the steps
drying a web,
controlling a tension profile of the web after the drying step in accordance with the method of any of claims 1 to 6, and
passing the web to a further treatment like reeling-up the web .
8. Web tension profile control apparatus comprising
web heating means and pressure treating means;
tension profile measuring means adapted to measure the tension profile of the web;
profiled treatment means adapted to treat the web in the width direction of the web in accordance with a
measured tension profile by profiled actuation of a heat treating means or profiled actuation of a spreading means.
9. Web tension profile control apparatus according to claim 8, wherein the web heating means is formed integral with the pressure treating means or is provided immediately upstream of the pressure treating means.
10. Web tension profile control apparatus according to claim 8 or 9, wherein the tension profile measuring means is adapted to measure the tension profile of the web online and is arranged downstream of the profiled treatment means, wherein the control apparatus is adapted to feedback control the tension profile of the web.
11. Web tension profile control apparatus according to any of claims 8 to 10, wherein the pressure treating means comprises a long treatment zone which is for example formed between a heat conductive belt and a counter roll.
12. Web tension profile control apparatus according to any of claims 8 to 11, wherein the heat treating means is adapted to perform profiled heat treating of elements in contact with the web for heat treating the web, and is for example a profilable hot air-blow device or a profilable induction heating device.
13. Web tension profile control apparatus according to any of claims 8 to 12, wherein the profiled treatment means comprises a spreader roll as a spreading means arranged downstream of the heating means and the pressure treating means, and is adapted to actuate the spreader roll in accordance with the measured tension profile.
14. Web manufacturing machine comprising a drying section, a web tension profile control apparatus according to any of claims 8 to 13 and a further section like a reel-up
section, wherein the tension profile control device is arranged at the dry end of the paper machine subsequent to the drying section and previous to the further section.
PCT/EP2010/055516 2010-04-26 2010-04-26 Method for controlling a tension profile of a web and web tension profile control apparatus WO2011134487A1 (en)

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PCT/EP2010/055516 WO2011134487A1 (en) 2010-04-26 2010-04-26 Method for controlling a tension profile of a web and web tension profile control apparatus
EP10718538A EP2563700A1 (en) 2010-04-26 2010-04-26 Method for controlling a tension profile of a web and web tension profile control apparatus

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WO2017144784A1 (en) * 2016-02-25 2017-08-31 Valmet Technologies Oy Method, system and a computer program product for condition monitoring of a continuous element moving in a fiber web or paper finishing machine
CN111254618A (en) * 2020-01-15 2020-06-09 武汉智达纺织科技有限公司 Roller assembly for fabric dyeing machine

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US9028027B2 (en) 2013-07-02 2015-05-12 Ricoh Company, Ltd. Alignment of printheads in printing systems
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CN111254618A (en) * 2020-01-15 2020-06-09 武汉智达纺织科技有限公司 Roller assembly for fabric dyeing machine

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