JP2006185696A - Heating roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating roll capable of making the temperature of the surface of the roll uniform. <P>SOLUTION: The heating roll 1 consists of a shaft 2 which is not rotated, a hollow roll 4 which is supported rotation free around the shaft 2, and a heater 5 which is fixed to the shaft 2 inside the roll 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heating roll used for laminating films.

  In laminating a film, a plurality of films are welded to each other by inserting the laminated film between rolls having a temperature of several hundred ° C. and heating while pressing. In FIG. 2, the cross section of the conventional heating roll used for such a lamination process is shown. In a conventional heating roll, axial holes 22 are provided in a cylindrical roll 21 at equal intervals in the circumferential direction, and an electric heating element 23 is inserted into the holes 22 to heat the surface of the roll 21 to a predetermined temperature. It is supposed to be. Electric power is supplied to these heating elements 23 via a slip ring provided on the rotating shaft.

  In the conventional heating roll, the distance from the electric heating element 23 varies little by little depending on the position on the surface of the roll 21, and temperature unevenness is generated. Such temperature unevenness is caused by increasing the thickness of the roll 21 and disposing the electric heating element 23 in the deep part of the roll 21 as much as possible, thereby reducing the distance difference depending on the position and increasing the heat capacity of the roll 21 to the resin film. This can be improved by reducing the temperature drop caused by the heat. However, when a metal foil is bonded to a resin film, for example, when a temperature accuracy of 400 ° C. or higher and less than ± 1 ° C. is required, depending on the speed of lamination, it is required for the conventional structure. It is difficult to meet temperature accuracy.

  In view of the above problems, an object of the present invention is to provide a heating roll that can make the surface temperature of the roll uniform.

  In order to solve the above problems, a heating roll according to the present invention includes a non-rotating shaft, a hollow roll rotatably supported around the shaft, and a heater fixed to the shaft inside the roll. Shall.

  According to this configuration, a heater that uniformly heats the roll in the circumferential direction can be employed, and the relative position of the heater with respect to the roll surface is moved by the rotation of the roll, so the temperature of the heater surface is averaged and does not vary. Furthermore, since the heater does not rotate, power can be supplied to the heater without using a moving part such as a slip ring, so there are no consumable parts and the service life is long, which is economical.

  Moreover, the heating roll of this invention WHEREIN: The cylindrical cast-in heater which has a clearance gap between the said rolls may be sufficient.

  According to this configuration, the roll is heated from the inside by the radiant heat of the casting heater having a uniform surface temperature. By making it non-contact, there is no variation in thermal resistance due to manufacturing errors and the inner surface of the roll can be heated uniformly, so that the surface temperature of the roll becomes constant. Moreover, since the heater and the roll do not contact, there is no wear.

  In the heating roll of the present invention, the heater may be divided into three or more in the axial direction, and among the divided heaters, the heating value of the heaters on both sides is made larger than the heating value of the central heater. May be.

  According to this configuration, the amount of heating in the axial direction can be varied in consideration of heat radiation from the end of the roll, so that the temperature can be equalized not only in the circumferential direction of the roll but also in the axial direction. In particular, if the amount of heat generated by the outer heater is increased, it is possible to prevent heat from leaking from the support structure at the end of the roll and lowering the temperatures on both sides from the center of the roll.

  In the heating roll of the present invention, the shaft is hollow and has an internal space, and a through hole is provided in the vicinity of the bearing supporting the roll to communicate the internal space with the outside. A suction device for sucking out water may be connected to an opening provided at the end of the shaft.

  According to this configuration, it is possible to create an air flow on the surface of the bearing that is heated by heat conduction from the roll, and to cool the bearing to prevent troubles such as seizure due to overheating. Further, since the bearing is cooled by vacuum, there is no trouble due to dust scattering.

  In the heating roll of the present invention, the through hole opens into a bearing chamber constituted by the bearing, the shaft, and the roll, and the roll has an intake hole that communicates the bearing chamber with the outside. Also good.

  According to this configuration, the inside of the bearing can also be cooled.

  As described above, according to the present invention, the roll rotating with the fixed heater can be uniformly heated to make the temperature of the roll surface uniform.

Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 shows a cross section of a heating roll 1 according to an embodiment of the present invention. The heating roll 1 has a shaft 2 which is a hollow cylinder having an outer diameter of 70 mm, and an outer diameter of 300 mm which can be rotated around the shaft 2 with both ends supported by a flange-shaped roll end portion 3 in which a short tube protrudes outside. A hollow cylindrical roll 4 having a length of 500 mm and three cylindrical cast-in heaters 5 fixed to the shaft 2 in the axial direction inside the roll 4.

  The cast-in heater 5 is a cylindrical ceramic that is fired by spirally winding a heating wire 6 therein, and is supported concentrically on the shaft 2 by a support ring 7. A feeding line 8 to the heating wire 6 is connected to the inside of the cast-in heater 5, and a ceramic heat insulating material 9 is filled so as to fill a space between the shaft 2. The power supply line 8 extends from the through hole provided in the shaft 2 to the internal space of the shaft 2. The cast-in heater 5 has a length of 100 mm, and faces only the central 300 mm portion of the roll 4 with a gap of about 5 mm between the inner surface of the roll 4.

  The roll 4 is made of a forged product of chromium molybdenum steel (SCM) and has a thickness of about 30 mm. The roll ends 3 that support the roll 4 at both ends are respectively supported by the shaft 2 by two bearings 10, and the two bearings at each end are separated by a spacer 11, It arrange | positions between an inner surface and the outer surface of the shaft 2, and is fixed with the fixing ring 12 so that it may not move to an axial direction. The roll end 3 is provided with a V pulley 13 for transmitting power for rotating the roll 4. A bearing chamber 14, which is a space sandwiched between two bearings 10 between the shaft 2 and the roll end 3, communicates with an external space through an intake hole 3 a provided in the roll end 3, and is provided in the spacer 11. The through-hole 11 a and the through-hole 2 a provided in the shaft 2 communicate with the internal space of the shaft 2. A seal plate 15 is attached to the inner wall in the axial direction of the roll end 3 to isolate the bearing 10 from the inner space of the roll 4.

  One end of the shaft 2 is sealed with a sealing member 16, and the feed line 8 of the cast-in heater 5 is drawn out through the sealing member 16. The other end of the shaft 2 is open to the outside, and a nozzle 17 is attached to which a hose of a suction device (not shown) such as a vacuum pump can be connected.

Then, the effect | action of the heating roll 1 which consists of the above structure is demonstrated.
The heating roll 1 is usually arranged so that the surface of the roll 4 is in contact with the other heating roll 1 in parallel, and each heating roll 1 rotates in the opposite direction to the V pulley 13 by a V belt (not shown). To be driven. When a plurality of films are passed between the two rolls 4 rotating in this manner, the films are welded by the heat of the rolls 4 to form a laminate film.

  Generally, the cast-in heater can be formed into an arbitrary shape, and the heat generation characteristics are determined by the arrangement of the heating wire 6 inside. The cylindrical cast-in heater 5 as in this embodiment is a simple shape, so it is relatively easy. Can produce. The cast-in heater 5 is supplied with electric power from the power supply line 8, the heating wire 6 generates heat, the surface temperature becomes 600 ° C. or higher, and the roll 4 is heated mainly by radiant heat. By monitoring the temperature of the roll 4 with a temperature sensor (not shown) and controlling the electric power supplied to the casting heater 5, the surface temperature of the roll 4 can be controlled to an arbitrary temperature of 400 to 450 ° C.

  Each cast heater 5 generates heat substantially uniformly in the axial direction and the circumferential direction, but since there is a gap between the roll 4 and the roll 4 is heated by radiant heat, there is no variation in thermal resistance, and the inner surface of the roll 4 Heat transfer evenly. Furthermore, since the roll 4 rotates with respect to the casting heater 5, slight variations in the amount of heat generated in the circumferential direction of the casting heater 5 can be absorbed.

  However, since heat leaks from both ends of the roll 4 to the roll end 3, the temperature at both ends of the roll 4 becomes low. For this reason, the number of turns of the heating wire 6 is changed or the input power is made different so that the calorific value of the casting heaters 5 on both sides is larger than the calorific value of the central casting heater 5. Thus, more heat than the center is supplied to both sides of the roll 4 corresponding to the amount of heat leaking from the roll end 3 so that the surface temperature of the roll 4 has a uniform distribution in the axial direction. However, in the roll 4, the surface temperature is uniform at a portion where the cast heater 5 is provided inside, and this range of about 300 mm is used as an effective range.

  Since the cast-in heater 5 does not rotate in the heating roll 1, the power supply line 8 can be directly connected to the power source without providing a sliding member such as a slip ring. Therefore, there is no consumable part and it has a long life.

  The bearing 10 that supports the roll end 3 is lubricated with heat-resistant grease. However, if the bearing 10 is used at a temperature exceeding 200 ° C., the grease flows out and breaks in a short period of time. Therefore, in this embodiment, air in the bearing chamber 14 between the bearings 10 is passed through the through holes 2a and the spacers 11 provided in the shaft 2 by a suction device (not shown) connected to the nozzle 17 at the end of the shaft 2. By sucking out through the shaft 2 from the provided through-hole 11a, outside air at normal temperature is sucked into the bearing chamber 14 from the suction hole 3a provided in the roll end 3, and the bearing 10 is cooled by this outside air. . Since the vacuum is used for this cooling, the surrounding dust does not rise and adhere to the film inserted between the rolls 4.

  In addition to the illustrated through hole 3 a, a through hole 2 a may be provided in the inner shaft 2 of the inner bearing 10 and a vent hole 3 a may be provided in the roll end 3, and the outer shaft 2 of the outer bearing 10 may be penetrated. You may provide the hole 2a. Further, the nozzle 17 is not necessarily provided on the end surface of the shaft 2 and may be opened on a cylindrical surface outside the bearing 10.

  The present invention can be widely applied to heating rolls that require temperature accuracy as well as film lamination.

The longitudinal direction sectional view of the heating roll of the embodiment of the present invention. The transverse direction sectional view of the conventional heating roll.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating roll 2 Shaft 2a Through-hole 3 Roll end 3a Intake hole 4 Roll 5 Cast-in heater 10 Bearing 11a Through-hole 14 Bearing chamber 17 Nozzle (opening)

Claims (6)

A shaft that does not rotate,
A hollow roll rotatably supported around the shaft;
A heating roll comprising a heater fixed to the shaft inside the roll.   The heating roll according to claim 1, wherein the heater is a cylindrical casting heater having a gap between the heater and the roll.   The heating roll according to claim 1 or 2, wherein the heater is divided into three or more in the axial direction.   The heating roll according to claim 3, wherein the heating value of the heaters on both sides of the divided heaters is larger than the heating value of the central heater. The shaft is hollow and has an internal space, and a through hole is provided in the vicinity of the bearing that supports the roll to communicate the internal space with the outside.
The heating roll according to any one of claims 1 to 4, wherein a suction device for sucking out air in the internal space is connected to an opening provided at an end of the shaft. The through hole opens in a bearing chamber composed of the bearing, the shaft and the roll,
The heating roll according to claim 5, wherein the roll has an intake hole that allows the bearing chamber to communicate with the outside.

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