JP3845422B2 - Soft calendar device - Google Patents

Description

  The present invention relates to a soft calender apparatus provided with a roll pair in which a metal roll incorporating a heating means and an elastic roll are arranged to face each other.

By performing on-machine coating and high-temperature soft calendering at the time of paper making by a paper machine, a coated paper excellent in productivity and bulkiness and glossiness can be obtained without performing calendering separately after paper making, At that time, an induction coil composed of a coil and a core is incorporated inside the metal roll so that heating is performed by the principle of electromagnetic induction heat generation. Further, external heating or external cooling is additionally used in combination, and the metal roll is used as the external heating device. As an external cooling device, an electromagnetic induction type external heating device that can be divided and controlled in the roll axis direction, or an external heating device that jets a jet stream heated to a high temperature is arranged. By arranging an external cooling device that injects fine mist and cools with the heat of vaporization, the temperature profile in the axial direction of the metal roll is controlled accurately. And, to obtain a good coated paper to the paper thickness and gloss profiles are known (e.g., see Patent Document 1.).
Japanese Patent Laid-Open No. 11-61691

  However, in the soft calender device disclosed in Patent Document 1, the external heating device disposed to face the outer peripheral surface of the metal roll is a diametrically opposite side of the metal roll from the pressure contact portion of the elastic roll. It is installed so as to face the outer peripheral surface of the roll with an appropriate interval. Further, although not disclosed in the above-mentioned Patent Document 1, it is considered that the external cooling device is also installed in the same manner. Therefore, if the metal roll is moved during adjustment work or maintenance / inspection work to pressurize and separate the metal roll and the elastic roll, it will interfere with the external heating device and external cooling device. It is necessary to remove the external heating device and external cooling device, and it is necessary to re-install after adjustment, including adjustment work, which requires a lot of work man-hours and causes a decrease in the operating rate of the paper machine There was a problem.

  In addition, since the external cooling device uses the heat of vaporization of fog, there is a problem that it is difficult to control the temperature profile delicately and with high accuracy.

  In view of the above-mentioned conventional problems, the present invention can accurately control the temperature profile of a metal roll with a built-in heating means by an external device, and eliminates interference with the external device when the metal roll is moved, thereby adjusting the work. It is an object of the present invention to provide a soft calendar device that can reduce the number of working steps during maintenance and inspection.

The soft calender device of the present invention includes one or a plurality of roll pairs in which a metal roll incorporating a heating unit and an elastic roll are arranged to face each other, and each roll pair moves one of the rolls toward the other roll. In the soft calender device configured to be pressurizable, the heating means built in the metal roll is heated so as to be split-controllable in the roll axis direction to a predetermined temperature in the range of 230 to 500 ° C. by electromagnetic induction action capable of split control. An air blowing device for blowing air so as to be controllable in the roll axial direction toward the outer peripheral surface of the metal roll in any or all of the roll pairs, and press the metal roll against the fixed elastic roll In the roll pair, a metal roll is mounted on the swing arm so that it can move, and an air spray device is installed on the swing arm. It is intended.

  According to this configuration, by blowing low temperature or high temperature air toward the outer peripheral surface of the metal roll heated almost uniformly by the built-in heating means, and controlling the blowing in the roll axis direction, the outer periphery of the metal roll The temperature profile in the roll axis direction of the surface can be controlled delicately and accurately. In addition, since a metal roll is mounted on the swing arm and an air spraying device is installed on the swing arm, the swing arm is swung during adjustment work or maintenance and inspection work to interfere with the air spray device. The metal roll can be moved without any trouble, and adjustment work and maintenance inspection work can be performed without removing the air blowing device, reducing the work man-hours and stopping the paper machine operation accompanying maintenance inspection. The operating rate can be improved by shortening the time.

  Moreover, in the roll pair that presses the elastic roll mounted on the swing arm against the fixed metal roll, the air spray device is positioned closer to the press contact portion between the metal roll and the elastic roll than the axial center position of the metal roll. It is possible to move or remove the metal roll without interfering with the air blowing device during adjustment work or maintenance inspection work, and to perform adjustment work or maintenance inspection work without removing the air blowing device. Therefore, it is possible to reduce the number of work steps, shorten the operation stop time of the paper machine accompanying maintenance inspection, etc., and improve the operation rate.

In addition, one or a plurality of roll pairs in which a metal roll incorporating a heating means and an elastic roll are arranged to face each other are provided, and each roll pair is configured to be able to pressurize one of the rolls toward the other roll. In the soft calender device, the heating means built in the metal roll is a means for heating to a predetermined temperature in the range of 230 to 500 ° C. so as to be split controllable in the roll axis direction by electromagnetic induction action that can be split control, An air blowing device that blows air in the roll axis direction toward the outer peripheral surface of the metal roll in all roll pairs so that air can be divided and controlled, and is closer to the press contact portion between the metal roll and the elastic roll than the axial center position of the metal roll Even if an air spraying device is installed in this, the same effect can be obtained.

  Moreover, if the air spraying device is provided with temperature control means for adjusting the temperature of the spraying air, the temperature profile can be controlled more delicately and with high accuracy.

  According to the present invention, the temperature profile in the roll axis direction of the outer peripheral surface of the metal roll can be delicately and accurately controlled by spraying air by dividing and controlling in the roll axis direction toward the outer peripheral surface of the metal roll, In addition, since the metal roll is mounted on the swing arm and the air blowing device is installed on the swing arm, the metal roll can be moved without removing the air spray device by swinging the swing arm during adjustment work or maintenance inspection. Can be moved, and the man-hours for adjustment and maintenance can be reduced to improve the operating rate of the paper machine.

  Hereinafter, an embodiment of the soft calendar device of the present invention will be described with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a soft calender device in which two-stage (two nip) roll pairs 2 </ b> A and 2 </ b> B composed of a combination of a metal roll 3 and an elastic roll 4 are arranged. In the roll pair 2A on the upper side of the sheet passing path P, the metal roll 3 is fixedly installed on the upper part of the sheet passing path P, and the elastic roll 4 is pressed against the metal roll 3 from the lower part of the sheet passing path P. It is arranged to be movable. On the other hand, in the roll pair 2B on the lower side of the paper passing P, the elastic roll 4 is fixedly installed on the upper part of the paper passing path P, and the metal roll 3 is pressed against the elastic roll 4 from the lower part of the paper passing path P. It is arranged so as to be movable.

  Reference numeral 5 denotes a support frame of the soft calender device 1, and a support block 6 that supports the metal roll 3 of the roll pair 2A is mounted and fixed on the upper side of the upper side of the paper passing path P, and on the lower side, A swing arm 7 having an elastic roll 4 mounted on the distal end is mounted so as to be swingable up and down around the support shaft 8, and a cylinder device 9 is interposed between the distal end and the base end of the support frame 5. The elastic roll 4 can be moved up and down via the swing arm 7 and the elastic roll 4 can be pressed toward the metal roll 3 with a predetermined pressure.

  A support block 10 that supports the elastic roll 4 of the roll pair 2B is mounted and fixed on the upper side of the lower side of the paper passing path P of the support frame 5, and a metal roll 3 is mounted on the tip of the lower part. A swing arm 11 is mounted so as to be swingable up and down around the support shaft 12, and a cylinder device 13 is interposed between a distal end portion of the swing arm 11 and a base end portion of the support frame 5. The roll 3 can be moved up and down, and the metal roll 3 can be pressed toward the elastic roll 4 with a predetermined pressure.

  Reference numerals 14, 15, and 16 denote guide rollers disposed to restrict the sheet passing path P on the upper and lower sides of the roll pair 2 </ b> A and on the upper side of the roll pair 2 </ b> B, respectively. In addition, a doctor blade 17 is appropriately disposed around the metal roll 3 and the elastic roll 4 of each of the roll pairs 2A and 2B to scrape off deposits adhering to the outer peripheral surface of the roll. Further, a cooling nozzle 18 for quickly cooling the metal roll 3 and the elastic roll 4 by blowing cooling air toward the outer peripheral surfaces thereof is appropriately disposed so that the work can be quickly started during maintenance.

  In the roll pair 2A, the division control is performed in the roll axis direction so as to face the outer peripheral surface of the metal roll 3 at a position closer to the press contact portion between the metal roll 3 and the elastic roll 4 than the axial center position of the fixed metal roll 3. A possible air blowing device 19 is provided. In the roll pair 2 </ b> B, the air blowing device 19 is installed so as to face the outer peripheral surface of the metal roll 3 with respect to the swing arm 11 on which the metal roll 3 is mounted.

  As shown in FIG. 2, the metal roll 3 includes an electromagnetic induction type internal heating device 21 that can be divided and controlled in the roll axis direction. That is, an iron core 22 is provided in a non-rotating portion inside the rotatable shell 20 on the outer peripheral portion of the metal roll 3, and an induction coil 23 is provided around the iron core 22, and an alternating current is passed from the AC power supply 24 to the induction coil 23. Thus, the magnetic flux is generated in the induction coil 23, the induced current is induced inside the outer shell 20, and the shell 20 is self-heated by the resistance heat. The induction coil 23 is divided into a plurality in the roll axis direction, and the current flowing through the corresponding induction coil 23 is controlled based on the temperature signal from the temperature sensor 25 provided in the shell 20, so that the roll 20 in the roll axis direction of the shell 20 is controlled. In particular, the temperature of the surface can be controlled with high accuracy.

  Further, a large number (for example, about several tens to 90) of jacket paths 26 extending in the roll axis direction are provided in the shell 20 at intervals in the circumferential direction so as to communicate with each other, and heat is contained therein. By enclosing the medium, heat generated by self-heating of the shell 20 is absorbed, and the heat is uniformly transmitted to the entire surface of the shell 20.

  The air spraying device 19 is formed in an elongated box shape extending over almost the entire length of the metal roll 3, and includes a pressure chamber 27 extending over the entire length and a temperature control chamber 28 that is divided and formed, for example, every 25 to 45 cm in the roll axis direction. Yes. The pressure chamber 27 and the temperature control chamber 28 are communicated with each other through a plurality of communication ports 29, and a face plate facing the outer peripheral surface of the metal roll 3 of the temperature control chamber 28 with an appropriate interval of several mm to several cm is provided. A large number of jets 30 are arranged in a matrix.

  The outside air taken in through the filter 31 is introduced into the pressure chamber 27 via the damper 33 by the fan 32 so that the amount of air ejected from the ejection port 30 can be arbitrarily adjusted by arbitrarily adjusting the pressure in the pressure chamber 27. It is configured. Further, a heat exchanger 34 incorporating heating or cooling means is disposed in the temperature control chamber 28, and the temperature of the air ejected from the jet outlet 30 is arbitrarily set by operating the heating or cooling means in the temperature adjusting means 35. It is configured to be adjustable.

  The elastic roll 4 is made of a modified urethane-based, epoxy-based, or polyether-based plastic having excellent heat resistance, and its hardness is preferably 85 to 97, particularly about 85 to 94 in Shore D hardness. The nip pressure between the metal roll 3 and the elastic roll 4 is set and adjusted to about 125 to 350 KN / m.

  According to the above configuration, the surface temperature of the metal roll 3 is 230 to 500 ° C., preferably 250 to 380 ° C., particularly preferably 300 to 380 ° C. by the electromagnetic induction internal heating device 21 built in the metal roll 3. It can be heated to a predetermined temperature in the range, and in particular, it can be heated more uniformly in the roll axis direction when used together with the jacket path 26.

  However, as the surface temperature of the metal roll 3 is increased in this way, stress in the thickness direction is generated in the shell 20 of the metal roll 3, and the roll profile tends to collapse and the controllability of the paper thickness profile is improved. descend. Moreover, in the heating only by the internal heating device 21, the temperature responsiveness is poor, the temperature responsiveness in the roll axis direction is deteriorated due to this, and the temperature controllability is deteriorated, which causes a decrease in yield.

  For such a problem, an air spraying device 19 that can be divided and controlled in the roll axis direction is disposed facing the outer peripheral surface of the metal roll 3, and cooling air or heating air is directed toward the outer peripheral surface of the metal roll 3. Since the temperature is controlled by spraying, the metal roll 3 can be controlled with high precision and fineness so that a desired temperature profile can be obtained in the roll axis direction.

  Thus, the surface temperature of the metal roll 3 can be accurately controlled to a predetermined temperature within a range of 230 to 500 ° C., and the temperature can be controlled to have a predetermined temperature profile in the roll axis direction. As a result, even under high-speed operation exceeding 1500 m / min, soft calender processing can be performed with a low nip pressure of about 125 to 350 KN / m, and the on-machine soft calender device 1 is bulky and glossy. Coated paper having properties can be produced.

  In addition, in the roll pair 2 </ b> A that presses the elastic roll 4 mounted on the swing arm 7 against the fixed metal roll 3, the pressure contact portion between the metal roll 3 and the elastic roll 4 rather than the axial center position of the metal roll 3. Since the air blowing device 19 is installed at a position close to the position, the metal roll 3 can be moved or removed without interfering with the air blowing device 19 during adjustment work or maintenance inspection work, and the air blowing device 19 is removed. Therefore, adjustment work and maintenance / inspection work can be performed, so that the number of work steps can be reduced, and the operation stop time of the paper machine accompanying maintenance / inspection can be shortened to improve the operation rate.

  Further, in the roll pair 2B, the metal roll 3 is mounted on the swing arm 11 and the air blowing device 19 is installed on the swing arm 11, so that the swing arm 11 can be used during adjustment work or maintenance inspection work. By swinging, the metal roll 3 can be moved without interfering with the air blowing device 19. Therefore, adjustment work and maintenance / inspection work can be performed without removing the air blowing device 19, and therefore the number of work steps can be reduced, and the operation stoppage time of the paper machine accompanying maintenance / inspection can be shortened and the operation rate can be reduced. Can be improved.

  Further, even if the swing arm 11 is swung to move the metal roll 3 for pressure adjustment, the relative positional relationship between the metal roll 3 and the air spray device 19 remains unchanged. Since position adjustment work is unnecessary, pressure adjustment can be performed with good workability.

  In the soft calender device of the present invention, the metal roll 3 is mounted on the swing arm 11 and the air blowing device 19 is installed on the swing arm 11, so that the swing arm 11 is swung during adjustment work and maintenance inspection work. By moving, the metal roll 3 can be moved without removing the air blowing device 19 and the number of adjustment work and maintenance work can be reduced. Therefore, a soft calender device disposed on-machine in various paper machines Useful for.

It is a vertical front view showing a schematic structure of a soft calendar device of one embodiment of the present invention. It is a cross-sectional view which shows schematic structure of the internal heating apparatus and air spraying apparatus in the metal roll of the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Soft calendar apparatus 2A Roll pair 2B Roll pair 3 Metal roll 4 Elastic roll 7 Swing arm 11 Swing arm 19 Air spray apparatus 21 Internal heating apparatus

Claims (4)

A soft calendar comprising one or a plurality of roll pairs in which a metal roll incorporating a heating means and an elastic roll are arranged to face each other, and each roll pair can move one of the rolls and pressurize it toward the other roll. In the apparatus, the heating means built in the metal roll is a means for heating to a predetermined temperature in the range of 230 to 500 ° C. so as to be divided and controllable in the roll axis direction by electromagnetic induction that can be divided and controlled . An air blowing device that blows air in the roll axis direction so that it can be divided and controlled in the roll axial direction toward the outer peripheral surface of the metal roll in the roll pair, and the metal roll is swung in the roll pair that presses the metal roll against the fixed elastic roll A soft calendar characterized in that it is mounted on an arm so as to be movable and an air blowing device is installed on the swing arm. Apparatus.   In the roll pair that presses the elastic roll mounted on the swing arm against the fixed metal roll, the air spraying device is installed at a position closer to the press contact part between the metal roll and the elastic roll than the axial center position of the metal roll. The soft calendar device according to claim 1. A soft calendar comprising one or a plurality of roll pairs in which a metal roll incorporating a heating means and an elastic roll are arranged to face each other, and each roll pair can be moved toward one of the rolls and pressurized toward the other roll. In the apparatus, the heating means incorporated in the metal roll is a means for heating to a predetermined temperature in the range of 230 to 500 ° C. by the electromagnetic induction action that can be divided and controlled so as to be divided and controlled in the roll axis direction . An air blowing device that blows air toward the outer peripheral surface of the metal roll in the roll pair so as to be controllable in the roll axis direction is provided, and the air is positioned closer to the press contact portion between the metal roll and the elastic roll than the axial center position of the metal roll. A soft calendar device characterized by installing a spraying device.   4. The soft calender device according to claim 1, wherein the air blowing device includes a temperature adjusting means for adjusting a temperature of the blowing air.

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