WO2002031259A1 - Calandre - Google Patents

Calandre Download PDF

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Publication number
WO2002031259A1
WO2002031259A1 PCT/FI2001/000880 FI0100880W WO0231259A1 WO 2002031259 A1 WO2002031259 A1 WO 2002031259A1 FI 0100880 W FI0100880 W FI 0100880W WO 0231259 A1 WO0231259 A1 WO 0231259A1
Authority
WO
WIPO (PCT)
Prior art keywords
roll
coating
grinding
calender
actuator
Prior art date
Application number
PCT/FI2001/000880
Other languages
English (en)
Inventor
Heikki Kaarakka
Seppo Palonen
Ville Tiistola
Pekka Koivukunnas
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 GB0308849A priority Critical patent/GB2384494B/en
Priority to AU2002210581A priority patent/AU2002210581A1/en
Priority to DE10196770T priority patent/DE10196770T5/de
Publication of WO2002031259A1 publication Critical patent/WO2002031259A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/02—Doctors for calenders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0233—Soft rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0253—Heating or cooling the rolls; Regulating the temperature
    • D21G1/0266—Heating or cooling the rolls; Regulating the temperature using a heat-transfer fluid
    • D21G1/0273—Heating or cooling the rolls; Regulating the temperature using a heat-transfer fluid on the exterior surface of the rolls

Definitions

  • the present invention relates to a calender containing at least one roll equipped with a soft polymer roll coating, for example a polymer- coated roll and a grinding device in connection with the same.
  • calendering The main purpose of calendering is to bring the surface properties and/or thickness of paper to a desired level.
  • a continuous paper web is guided via nips formed by rolls.
  • a roll equipped with a soft roll coating for example a polymer coated roll in the calendering.
  • polymer-coated rolls form a soft nip with their counter roll, said nip being longer than the nip between hard rolls, and the local surface pressure exerted on the paper web is smaller therein than in the corresponding "hard" nip.
  • Calenders can comprise superimposed rolls, between which calendering nips are formed.
  • the nip can also be formed between a polymer-coated roll and a hard counter roll of the same in a single calender roll pair, and the calender can contain two such pairs successively to attain two-sided treatment.
  • the roll positioned against the polymer-coated roll is typically a heated so-called thermoroll by means of which temperature can be used as a variable in the calendering of paper, but which causes some problems.
  • the surface of the polymer-coated roll is subjected to a thermal stress dependent on the temperature of the heated counter roll, i.e. the thermo roll, in those edge areas of the roll in which the paper web to be calendered that is passed through the nip is not located between the counter roll and the polymer coated roll.
  • Known solutions for preventing the damaging of the polymer coating in the nip between the polymer-coated roll and the thermo roll include for example the oscillation of paper from one edge to another, wherein the average temperature in the ends of the roll is reduced because the paper protects the ends of the roll.
  • This arrangement is known in offline calenders.
  • Another known solution is to run the paper in overwide form and cut the edges off after the calender.
  • Such a solution is known for example from the patent publication Fl 83249 and in the corresponding publication GB 2218434.
  • the publication US 5,266,167 discloses a cooling system for a polymer-coated roll in which the ends of the roll are cooled down with a water film.
  • the water film is produced by means of a brush, sponge or felt cloth which is connected to the water source and can be moved in the axial direction of the roll.
  • the publication EP 792966 and the corresponding US patent 5,816,146 disclose a cooling system for a polymer-coated roll in which the ends of the roll are protected with an insulating band arrangement.
  • the insulating band is a looped band which travels over at least one reversing roll and which is tensioned with a tensioning device.
  • the international publication WO 99/36616 discloses a method developed for avoiding faults in the paper web, in which the calender roll is ground during the run by using a traversing grinding device whose function is automatic by means of measuring devices controlling the shape of the roll and recognizing the faults on the surface of the same.
  • One purpose of the invention is to eliminate the drawbacks in the calendering process outside the area covered by the web in particular, and to introduce a calender by means of which it is possible to avoid the damaging of the soft roll coating of the roll forming a nip with the heated counter roll in the edge areas.
  • the calender according to the invention is primarily characterized in that the grinding device containing a grinding tool and an actuator which is arranged to transfer the grinding tool against the roll coating, is placed in the vicinity of the roll coating, in the area remaining outside the edge of the web to be calendered.
  • the grinding device is fixed precisely to the supporting structure, it is possible to conduct grinding with great accuracy for example to produce a micro- bevel of an accurate angle in the edge of the roll coating.
  • the function of the grinding device can be automated in such a manner that the actuator that transfers the grinding tool against the roll coating obtains its commands on the basis of the information received from the temperature measurement.
  • the unit controlling the function of the grinding device it is possible to determine for example the threshold value of the surface temperature in which the grinding device starts to conduct grinding.
  • the temperature sensor is placed in such a manner that it measures the temperature of the coating at that point in particular in which the production of damages should be prevented, especially in the same edge zone of the coating which will be subjected to grinding.
  • Fig. 1 illustrates the structure of a roll equipped with a soft roll coating and the location of the counter roll of the same and the paper web
  • Fig. 2 shows a side view of the roll and the grinding device
  • Fig. 3 shows the grinding device and the roll on a larger scale at the location of the edge of the coating.
  • Fig. 1 shows two rolls of the calender that are arranged rotatable, the lower of the rolls being a roll P equipped with a soft roll coating, such as polymer coating, that forms a calendering nip N with the heated counter roll, a so-called thermo roll T.
  • the frame of the calender is not shown and only the lower part of the shell of the thermo roll is shown.
  • the soft-faced roll P can be for example a roll made by the applicant equipped with a "Dura" coating, the surface roughness R a of which is of the order of 0.1 to 0.4 ⁇ m, and the hardness of which varies in the range of 85° to 93° Sh.D, but the invention is not restricted solely to these rolls.
  • the heated counter roll T can be a metal roll with a hard surface, for example a chill cast roll.
  • the paper web W to be calendered travels through the nip N, wherein it is subjected to the effect of temperature and pressure in a manner known as such.
  • the arrangement according to Fig. 1 can be in a calender, in which the nip is formed between the rolls in a calender roll pair, wherein two such pairs can be located successively, or the arrangement can also be located in a stack of calender rolls comprising several rolls, wherein the described roll equipped with a soft roll coating can be for example the intermediate roll in the stack of calender rolls.
  • the soft roll coating P1 is placed on top of a straight cylindrical shell P2 that functions as a core for the roll, in such a manner that it covers the shell at least in the area of its central part, in which the web to be calendered travels.
  • the shell of the roll can be exposed in both ends of the roll, i.e. the coating does not extend ail the way to the outer edge of the shell.
  • both edges of the coating are equipped with a bevel V within a narrow zone, in which bevel the coating gradually becomes thinner towards the end of the roll. Between the bevels V there remains a straight zone of the roll coating P1, which is intended to be in contact with the web W to be calendered that is passed through the nip.
  • the term straight refers to the shape of the outer surface resulting from the evenness of the coating in the axial direction of the roll, without taking into account possible deflections of the roll.
  • the area covered by the web W in the nip N is in Fig. 1 the area remaining between the dotted lines.
  • the web W does not cover the coating P1 entirely in the nip in the section between the bevels V of the same, and neither does it cover entirely the straight shell surface of the counter roll T on the opposite side.
  • a grinding device G is positioned by said edge area, by means of which it is possible to perform the grinding, if necessary.
  • the grinding device G is placed within a suitable distance from the nip N itself in the direction of the periphery of the roll.
  • Fig. 2 shows in more detail the structure of the grinding device G.
  • the grinding device is placed in the transverse beam B of the calender, and it contains a grinding tool 1 , for example a diamond grinding pad which is fixed to a sledge 2 that is arranged to move in the radial direction with respect to the roll P along a guide located in the body 3 of the grinding device by means of an actuator 4 effecting a linear movement, advantageously by means of a pressurized medium operated actuator, such as a pneumatic cylinder.
  • the actuator 4 can also operate electrically.
  • the opposite ends of the actuator 4 are fixed to the backside of the sledge 2 and to a part protruding from the body 3.
  • the body 3 of the grinding device itself which is always within a fixed distance from the roll coating P1 in the radial direction is fixed to the transverse beam B or to a corresponding supporting structure connected to the frame of the calender.
  • the grinding device G can be arranged to move in the transverse direction for example for that purpose that it can always be arranged in a standby position opposite to the edge area of the coating of the calender roll remaining outside the web, in which standby position it is during the running of the calender, when grinding is not necessary.
  • Fig. 2 shows the grinding device G in the working position in which the actuator 4 has with a short linear movement in the radial direction of the roll P transferred the grinding tool 1 that has been away from the contact with the coating P1 in the standby position, in contact with the roll coating P1.
  • the curvature of the grinding surface of the grinding tool in the cross-section of the roll P corresponds to the curvature of the outer surface of the coating P1, wherein the grinding tool 1 is in contact with the coating P1 within a fixed length along the periphery of the same.
  • Fig. 3 shows the location and structure of the grinding tool G in a view perpendicular to the view of Fig. 2.
  • the figure shows how the surface of the grinding tool 1 located opposite to the roll coating P1 is also slightly diagonal with respect to the axial line of the outer surface of the coating P1 in such a manner that it is possible to produce a micro- bevel in the outer edge of the straight portion of the coating, i.e. a part tapering conically towards the end of the roll P.
  • the angle corresponding to the micro-bevel i.e. the angle of inclination of the grinding surface of the grinding tool 1 with respect to the coating is considerably exaggerated. In practice, the angle is under 0.5°, for example approximately 0.2°.
  • the grinding tool G can be operated manually by means of a control panel, if the user detects signs of thermal damage risks, for example dirt in the edge of the coating. It is, however, possible that the device functions automatically when a fixed threshold value correlating with the risk of damages is attained.
  • Fig. 1 shows a temperature sensor S placed in the same zone with the grinding device G but within a suitable angular distance from the same in the peripheral direction, said temperature sensor S communicating with a comparator unit via a data transmission line D, in which comparator unit a fixed temperature value (threshold value) is set beforehand. This thresholdvalue must not be reached by the edge zone of the roll coating P1 outside the web W. The sensor S measures the temperature of the edge area of the roll coating P1 remaining outside the edge of the web W.
  • the comparator unit C transmits a command via the control line L to the actuator 4 of the grinding device G to transfer the grinding tool 1 against the coating P1.
  • the grinding may be under way for a predetermined period of time at the same time when the roll P rotates and performs calendering of the paper web. Thereafter it is again possible to monitor the temperature. If the temperature does not fall underneath the threshold value after a set time, the procedure is repeated. Alternatively, it is possible to continue grinding for such a long period of time that the temperature falls below the threshold value.
  • the actuator 4 is advantageously a pressurized medium operated actuator, wherein the pressure of the pressurized medium therein, for example in the case of pneumatic cylinder, the pressure of air, at the same time determines the grinding pressure.
  • the actuator can also operate electrically, wherein the grinding pressure can be made dependent on an electric variable.
  • the measurement of temperature by means of the sensor S can be implemented with a known measurement method which can be used for measuring surface temperatures.
  • Fig. 2 also shows liquid nozzles 6 located within a suitable angular distance from the grinding device G, said liquid nozzles being connected to a source of a cooling agent, wherein at the same time with the grinding it is possible to spray cooling agent, for example water onto the coating. Thereby it is possible to rapidly cool down the roll coating P1 to minimize the risk of damages.
  • the grinding pad dries the roll and prevents the cooling agent from splashing.
  • the nozzles are positioned directly after the grinding device G in the direction of rotation, for example in an angular distance of 90° therefrom.
  • the nozzles 6 can be coupled to operate simultaneously with the grinding device G under the control of the comparator unit C.
  • the invention can be applied in all calenders containing a combination of the above-described roll equipped with a soft roll coating and heated counter roll.
  • the calender in which the grinding device is used may be an on-line calender located in the production line of paper or an off-line calender located in a separate finishing apparatus.
  • the grinding device G and one or more cooling agent nozzles 6 possibly located in the same edge zone may be positioned in both edges of the coating P1, although Fig. 1 shows a grinding device G located only on one edge.

Landscapes

  • Paper (AREA)
  • Coating Apparatus (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

La présente invention concerne une calandre comprenant au moins un cylindre (P) équipé d'un revêtement de cylindre mou (P1) tel qu'un revêtement polymère et, relié au cylindre, un dispositif de défibrage (G). Le dispositif de défibrage (G), qui comprend un outil de défibrage (1) et un actionneur (4) disposé de manière qu'il transfère l'outil de défibrage (1) contre le revêtement de rouleau (P1), est placé à proximité du revêtement de cylindre mou, dans une zone qui reste à l'extérieur du bord de la bande (W) à calandrer.
PCT/FI2001/000880 2000-10-11 2001-10-11 Calandre WO2002031259A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB0308849A GB2384494B (en) 2000-10-11 2001-10-11 Calender
AU2002210581A AU2002210581A1 (en) 2000-10-11 2001-10-11 Calender
DE10196770T DE10196770T5 (de) 2000-10-11 2001-10-11 Kalander

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FIU-20000395 2000-10-11
FI20000395U FI4742U1 (fi) 2000-10-11 2000-10-11 Kalanteri

Publications (1)

Publication Number Publication Date
WO2002031259A1 true WO2002031259A1 (fr) 2002-04-18

Family

ID=8557646

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2001/000880 WO2002031259A1 (fr) 2000-10-11 2001-10-11 Calandre

Country Status (5)

Country Link
AU (1) AU2002210581A1 (fr)
DE (1) DE10196770T5 (fr)
FI (1) FI4742U1 (fr)
GB (1) GB2384494B (fr)
WO (1) WO2002031259A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10325947C5 (de) * 2003-06-07 2009-11-26 Voith Patent Gmbh Verfahren zum Behandeln einer Bahn, insbesondere einer Papierbahn

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5289766A (en) * 1992-02-01 1994-03-01 Kleinewefers Gmbh Apparatus for cooling calender rolls and the like
WO1999036616A1 (fr) * 1998-01-20 1999-07-22 Valmet Corporation Procede et dispositif de conditionnement d'un cylindre, notamment d'un cylindre d'une machine a papier ou d'un dispositif de finissage du papier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5289766A (en) * 1992-02-01 1994-03-01 Kleinewefers Gmbh Apparatus for cooling calender rolls and the like
WO1999036616A1 (fr) * 1998-01-20 1999-07-22 Valmet Corporation Procede et dispositif de conditionnement d'un cylindre, notamment d'un cylindre d'une machine a papier ou d'un dispositif de finissage du papier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10325947C5 (de) * 2003-06-07 2009-11-26 Voith Patent Gmbh Verfahren zum Behandeln einer Bahn, insbesondere einer Papierbahn

Also Published As

Publication number Publication date
DE10196770T5 (de) 2004-04-15
GB0308849D0 (en) 2003-05-21
AU2002210581A1 (en) 2002-04-22
GB2384494A (en) 2003-07-30
GB2384494B (en) 2004-08-25
FI4742U1 (fi) 2000-12-13
FIU20000395U0 (fi) 2000-10-11

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