JP2018035488A - Induction heating roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable compatibility between uniformalization of temperature distribution on a roller surface in an axial direction and efficient temperature rising on the roller surface.SOLUTION: An induction heating roller 30 comprises a coil 32, a roller main body 31 having a cylindrical external cylinder part 33 placed on the radial outside of the coil 32, and a uniform-heating member 36 placed on the radial outside of the coil 32 and the radial inside of the external cylinder part 33 and being in contact with the inner peripheral surface of the external cylinder part 33. Heat conductivity of the uniform-heating member 36 in the axial direction is higher than heat conductivity of the external cylinder part 33 and electric resistivity of the uniform-heating member 36 in the peripheral direction is higher than electric resistivity of the external cylinder part 33.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an induction heating roller used for heating a yarn.

  For example, as described in Patent Documents 1 and 2, induction heating rollers that raise the temperature of the roller surface by induction heating using a coil are known. The induction heating roller of Patent Document 1 has a configuration in which a thin film layer that is a magnetic material is formed on the inner peripheral surface of a roller body that is a non-magnetic material and a high thermal conductor. When the coil is energized, the thin film layer inside the roller body generates heat by induction heating, and the roller surface is heated by heat conduction from the thin film layer to the roller surface. Moreover, in the induction heating roller of Patent Document 2, a conductor is provided on the inner peripheral surface of a roller body made of carbon steel. Then, like the induction heating roller of Patent Document 1, the conductor inside the roller body generates heat by induction heating, and the roller surface is heated by heat conduction from the conductor to the roller surface.

JP 7-218130 A Japanese Patent No. 4903327

  As described above, in the induction heating rollers of Patent Documents 1 and 2, the roller body does not generate heat directly by induction heating, but the member inside the roller body generates heat. That is, a portion far from the roller surface to be heated (the outer peripheral surface of the roller body) generates heat, and there is a problem that the roller surface cannot be heated efficiently.

  Further, in the induction heating roller, heat generated by induction heating is not uniform in the axial direction, and accordingly, the temperature of the roller surface is also non-uniform in the axial direction. For this reason, when the induction heating roller is used for heating the yarn, the degree to which the yarn is heated varies depending on the position where the yarn contacts the roller surface, and the quality of the yarn may not be stable. In this regard, in the induction heating roller of Patent Document 2, a jacket body in which a gas-liquid two-phase heat medium is sealed is provided in the roller body, and this jacket chamber functions as a heat pipe so that the temperature of the roller surface is increased. Is considered to be uniform to some extent in the axial direction. However, in the configuration in which the jacket chamber (heat pipe) is provided in the roller body, the heat capacity of the roller body increases due to the increase in the thickness of the roller body. Efficient heating of the surface was made more difficult.

  In view of the above problems, the induction heating roller according to the present invention aims to achieve both uniform temperature distribution in the axial direction on the roller surface and efficient temperature increase on the roller surface.

  According to a first aspect of the present invention, there is provided a roller main body having a coil and a cylindrical outer tube portion disposed on the outer side in the radial direction of the coil, and on the radially outer side of the coil and on the inner side in the radial direction of the outer tube portion. A heat equalizing member disposed and in contact with the inner peripheral surface of the outer tube portion, and the heat conductivity of the heat equalizing member in the axial direction is higher than the heat conductivity of the outer tube portion, and the circumferential direction. In the above, the electrical resistivity of the soaking member is higher than the electrical resistivity of the outer cylinder part.

  In the first aspect of the present invention, the heat equalizing member is provided so as to be in contact with the inner peripheral surface of the outer cylindrical portion of the roller body, and the thermal conductivity of the heat equalizing member in the axial direction is made higher than that of the outer cylindrical portion. ing. For this reason, the temperature distribution in the axial direction of the heat equalizing member is likely to be uniform, and the temperature distribution in the axial direction can be made uniform even in the outer cylinder portion in contact with the heat equalizing member. In addition, since the electrical resistivity of the heat equalizing member in the circumferential direction is higher than that of the outer cylindrical portion, eddy current due to electromagnetic induction flows through the outer cylindrical portion more than the heat equalizing member, and induction heating in the outer cylindrical portion is promoted. Is done. For this reason, the part nearer to the roller surface (outer peripheral surface of the outer cylinder part) than the heat equalizing member is heated more, and the temperature of the roller surface can be raised efficiently. Moreover, since the heat pipe can be omitted by providing the soaking member, the thickness of the outer cylinder portion of the roller body can be reduced. As a result, the heat capacity of the outer cylinder portion is reduced and the temperature of the entire outer cylinder portion is likely to rise, so that the roller surface, which is the outer peripheral surface of the outer cylinder portion, can be efficiently heated. Thus, according to the first aspect of the present invention, it is possible to achieve both uniform temperature distribution in the axial direction on the roller surface and efficient temperature increase on the roller surface.

  According to a second aspect of the present invention, there is provided a roller body having a coil and a cylindrical outer cylinder portion arranged on the radially outer side of the coil, on a radially outer side of the coil and on a radially inner side of the outer cylinder portion. A heat equalizing member disposed in contact with the inner peripheral surface of the outer cylinder portion, and the heat conductivity of the heat equalization member is higher than the heat conductivity of the outer cylinder portion in the axial direction, and The relative permeability of the heat member is lower than the relative permeability of the outer cylinder portion.

  In the second aspect of the present invention, the heat equalizing member is provided so as to come into contact with the inner peripheral surface of the outer cylindrical portion of the roller body, and the thermal conductivity of the heat equalizing member in the axial direction is made higher than that of the outer cylindrical portion. ing. For this reason, the temperature distribution in the axial direction of the heat equalizing member is likely to be uniform, and the temperature distribution in the axial direction can be made uniform even in the outer cylinder portion in contact with the heat equalizing member. In addition, since the relative magnetic permeability of the heat equalizing member is lower than that of the outer cylindrical portion, more magnetic flux flows through the outer cylindrical portion than the heat equalizing member, and induction heating in the outer cylindrical portion is promoted. For this reason, the part nearer to the roller surface (outer peripheral surface of the outer cylinder part) than the heat equalizing member is heated more, and the temperature of the roller surface can be raised efficiently. Moreover, since the heat pipe can be omitted by providing the soaking member, the thickness of the outer cylinder portion of the roller body can be reduced. As a result, the heat capacity of the outer cylinder portion is reduced and the temperature of the entire outer cylinder portion is likely to rise, so that the roller surface, which is the outer peripheral surface of the outer cylinder portion, can be efficiently heated. Thus, according to the second aspect of the present invention, it is possible to achieve both uniform temperature distribution in the axial direction on the roller surface and efficient temperature increase on the roller surface.

  In the present invention, it is preferable that the soaking member is a cylindrical member having the same outer diameter as the inner diameter of the outer cylinder portion.

  In this case, the heat equalizing member comes into contact with the inner peripheral surface of the outer cylinder part over the entire circumference, so that the temperature distribution on the roller surface can be effectively uniformed even in the circumferential direction.

  In the present invention, it is preferable that the cylindrical member is divided into a plurality of parts in the circumferential direction.

  By doing so, the manufacturing becomes easier as compared with the case where the cylindrical member is manufactured as a single component. Also, assembly is easy.

  In the present invention, it is preferable that the heat equalizing member is made of a material including a fiber material.

  When the heat equalizing member is configured to include a fiber material, the heat conductivity in the fiber arrangement direction can be increased. Therefore, by changing the length and orientation of the fiber material, The electrical resistivity can be adjusted with a high degree of freedom.

  In the present invention, it is preferable that the fiber material is carbon fiber.

  Carbon fiber is a lightweight material having high thermal conductivity. Therefore, by configuring the heat equalizing member with a material containing carbon fiber, the temperature distribution on the roller surface can be more effectively uniformed, and the weight of the entire induction heating roller can be reduced.

  In the present invention, it is preferable that the carbon fibers are oriented in the axial direction.

  If the carbon fibers are oriented in the axial direction, the thermal conductivity in the axial direction of the soaking member increases, so the temperature distribution in the axial direction of the soaking member tends to be more uniform, and consequently the axial direction on the roller surface The temperature distribution can be made more uniform. Further, when the carbon fibers are oriented in the axial direction, the electrical resistance in the circumferential direction of the heat equalizing member increases, so that eddy current due to electromagnetic induction flows more in the outer cylinder portion than in the heat equalizing member. As a result, induction heating in the outer cylinder portion can be further promoted, and the temperature of the roller surface can be raised more efficiently.

  In the present invention, it is preferable that the carbon fibers are randomly oriented.

  When carbon fibers are randomly oriented, short fibers having a lower cost than long fibers can be used, and thus the cost can be reduced.

  In the present invention, the carbon fiber is preferably a pitch-based carbon fiber.

  As carbon fibers, pitch-based carbon fibers using pitch and PAN-based carbon fibers using acrylic fibers are known, but pitch-based carbon fibers have higher thermal conductivity than PAN-based carbon fibers. . For this reason, by using the pitch-based carbon fiber, the thermal conductivity of the soaking member can be further increased, and the temperature distribution on the roller surface can be more effectively uniformized.

  In the present invention, it is preferable that the soaking member is made of a carbon fiber reinforced carbon composite material that is a composite material of the carbon fiber and graphite.

  The carbon fiber reinforced carbon composite material has high thermal conductivity among the composite materials containing carbon fibers, and has high heat resistance. Therefore, by adopting the carbon fiber reinforced carbon composite material as the soaking member, it is possible to provide an induction heating roller that can more effectively equalize the temperature distribution on the roller surface and withstand high temperatures.

  In the present invention, it is preferable that the soaking member is made of a carbon fiber reinforced plastic that is a composite material of the carbon fiber and the resin.

  Carbon fiber reinforced plastics are less expensive but cheaper than carbon fiber reinforced carbon composite materials. Therefore, when heat resistance is not required for the induction heating roller, the cost can be reduced by adopting the carbon fiber reinforced plastic as the soaking member.

  In the present invention, it is preferable that the heat capacity of the soaking member is smaller than the heat capacity of the outer tube portion.

  In this case, since the temperature distribution of the outer cylinder portion is made uniform more quickly, the temperature distribution on the roller surface can be made uniform more quickly.

The schematic diagram which shows a spinning take-up machine provided with the induction heating roller which concerns on this embodiment. Sectional drawing of the induction heating roller which concerns on this embodiment. The table | surface which shows each physical-property value of the roller main body in this embodiment, and a soaking | uniform-heating member. The graph which shows transition of the temperature in the roller surface. The table | surface which shows each physical-property value of the roller main body in other embodiment, and a soaking | uniform-heating member.

(Spinning take-up machine)
An embodiment of the present invention will be described. FIG. 1 is a schematic diagram illustrating a spinning take-up machine including an induction heating roller according to the present embodiment. As shown in FIG. 1, the spinning take-up machine 1 has a configuration in which a plurality (six in this case) of yarn Y spun from the spinning device 2 is drawn by the spinning drawing device 3 and then taken up by the yarn winding device 4. It has become. In the following, description will be made with reference to directions attached to the respective drawings.

  The spinning device 2 generates a plurality of yarns Y by continuously spinning a molten fiber material such as polyester. The plurality of yarns Y spun from the spinning device 2 are fed with the oil agent by the oil agent guide 10 and then sent to the spinning and stretching device 3 through the guide roller 11.

  The spinning drawing device 3 is a device for drawing a plurality of yarns Y, and is disposed below the spinning device 2. The spinning / drawing device 3 has a plurality (here, five) of godet rollers 21 to 25 housed inside the heat insulation box 12. Each of the godet rollers 21 to 25 is an induction heating roller that is rotationally driven by a motor and induction-heated by a coil, and a plurality of yarns Y are wound around it. An inlet 12a for introducing a plurality of yarns Y into the inside of the heat insulation box 12 is formed in the lower part of the right side surface portion of the heat insulation box 12. A lead-out port 12b for leading out to the outside of the box 12 is formed. The plurality of yarns Y are wound around the godet rollers 21 to 25 in order from the lower godet roller 21 at a winding angle of less than 360 degrees.

  The lower three godet rollers 21 to 23 are preheating rollers for preheating a plurality of yarns Y before drawing, and the surface temperature of these rollers is equal to or higher than the glass transition point of the yarns Y (for example, 90 to 100 ° C.). Degree). On the other hand, the upper two godet rollers 24 and 25 are tempering rollers for heat-setting a plurality of stretched yarns Y. These roller surface temperatures are lower than the roller surface temperatures of the lower three godet rollers 21 to 23. Is set to a high temperature (for example, about 150 to 200 ° C.). Further, the yarn feeding speeds of the upper two godet rollers 24 and 25 are faster than those of the lower three godet rollers 21 to 23.

  The plurality of yarns Y introduced into the heat insulation box 12 through the introduction port 12a are first preheated to a temperature at which they can be stretched while being fed by the godet rollers 21-23. The plurality of preheated yarns Y are stretched by the difference in yarn feed speed between the godet roller 23 and the godet roller 24. Further, the plurality of yarns Y are heated to a higher temperature while being fed by the godet rollers 24 and 25, and the stretched state is heat set. The plurality of yarns Y drawn in this way are led out of the heat insulating box 12 through the outlet 12b.

  The plurality of yarns Y drawn by the spinning drawing device 3 are sent to the yarn winding device 4 through the guide roller 13. The yarn winding device 4 is a device that winds a plurality of yarns Y, and is disposed below the spinning drawing device 3. The yarn winding device 4 includes a bobbin holder 14 and a contact roller 15. The bobbin holder 14 has a cylindrical shape extending in the front-rear direction, and is rotationally driven by a motor (not shown). A plurality of bobbins B are mounted on the bobbin holder 14 in the axial direction. The yarn winding device 4 rotates a bobbin holder 14 to simultaneously wind a plurality of yarns Y around a plurality of bobbins B to produce a plurality of packages P. The contact roller 15 contacts the surfaces of the plurality of packages P, applies a predetermined contact pressure, and adjusts the shape of the package P.

(Induction heating roller)
FIG. 2 is a cross-sectional view of the induction heating roller according to the present embodiment. In FIG. 2, only a part of the output shaft 51 and the housing 52 is illustrated for the motor 50 to which the induction heating roller 30 is coupled. In addition, the induction heating roller 30 shown in FIG. 2 is a roller applied to all the godet rollers 21 to 25 in FIG.

  The induction heating roller 30 includes a cylindrical roller main body 31 along the axial direction (front-rear direction) and a coil 32 disposed inside the roller main body 31. The induction heating roller 30 raises the temperature of the outer peripheral surface 31a (hereinafter referred to as “roller surface 31a”) of the roller body 31 by using induction heating by the coil 32, thereby winding the roller surface 31a. The plurality of yarns Y that are hung are heated.

  The roller body 31 includes a cylindrical outer tube portion 33 disposed on the radially outer side of the coil 32, a cylindrical shaft center portion 34 disposed on the radially inner side of the coil 32, and a front end portion of the outer tube portion 33. And a disc-shaped end surface portion 35 that connects the front end portion of the shaft center portion 34. The rear end side of the roller body 31 is open. Moreover, the outer cylinder part 33, the axial center part 34, and the end surface part 35 are integrally formed.

  A cylindrical heat equalizing member 36 is provided on the radially inner side of the outer cylindrical portion 33 of the roller body 31 and on the radially outer side of the coil 32. The outer diameter of the heat equalizing member 36 is the same as the inner diameter of the outer cylindrical portion 33 (strictly speaking, the outer diameter of the heat equalizing member 36 is larger so that the heat equalizing member 36 can be inserted into the outer cylindrical portion 33. Slightly smaller). As a result, in the state where the heat equalizing member 36 is accommodated in the roller body 31, the outer peripheral surface of the heat equalizing member 36 is in contact with the inner peripheral surface of the outer cylindrical portion 33 over substantially the entire surface. As shown in FIG. 2, assuming that an axial region where a plurality of yarns Y are wound around the roller surface 31 a is a winding region R, the heat equalizing member 36 is provided over a range including the winding region R in the axial direction. It has been.

  The heat equalizing member 36 can be inserted into the outer cylindrical portion 33 through the opening on the rear end side of the roller body 31. The length of the heat equalizing member 36 in the axial direction is substantially the same as that of the outer cylinder portion 33, and the front end portion of the heat equalizing member 36 is in contact with the end surface portion 35 of the roller body 31. Both the outer cylindrical portion 33 and the rear end portion of the heat equalizing member 36 are fixed to an annular fixing member 37, whereby the heat equalizing member 36 is fixed to the roller body 31.

  A shaft attachment hole 34 a extending along the axial direction is formed in the shaft center portion 34 of the roller body 31. The output shaft 51 of the motor 50 is fixed to the shaft mounting hole 34a by fixing means (not shown), and the induction heating roller 30 can rotate integrally with the output shaft 51.

  The coil 32 has a configuration in which a conducting wire is wound around the outer peripheral surface of a cylindrical bobbin member 39. Although illustration is omitted, the bobbin member 39 is not a complete cylindrical shape, but has a C-shaped cross-sectional shape in which a part in the circumferential direction is cut. For this reason, an eddy current along the circumferential direction hardly flows through the bobbin member 39, and heat generation in the bobbin member 39 can be suppressed. The bobbin member 39 is attached to the housing 52 of the motor 50. An annular recess 52a is formed in the housing 52, and the above-described fixing member 37 is disposed in the recess 52a so as not to contact the bottom surface or side surface of the recess 52a. The output shaft 51 of the motor 50 is rotatably supported by the housing 52 via a bearing (not shown). When the motor 50 is operated, the induction heating roller 30 rotates integrally with the output shaft 51.

  Here, the roller body 31 of the present embodiment is made of carbon steel that is a magnetic body and also a conductor. The soaking member 36 is made of a C / C composite (carbon fiber reinforced carbon composite material) which is a composite material of carbon fiber and graphite, and pitch-based carbon fiber having high thermal conductivity is used as the carbon fiber. Yes. In this C / C composite, long fibers of carbon fibers are oriented in the axial direction, and the carbon fibers are continuous in the axial direction. In other words, the C / C composite has a configuration in which carbon fibers are not necessarily continuous in the circumferential direction and the thickness direction. FIG. 3 shows physical property values relating to the roller body 31 and the heat equalizing member 36 in the present embodiment. In addition, each physical property value of FIG. 3 is a numerical value at normal temperature (the same applies to FIG. 5).

  As described above, since the carbon fiber is oriented in the axial direction in the C / C composite constituting the soaking member 36, heat and electricity are easily transmitted in the axial direction (high thermal conductivity, Low electrical resistivity). On the other hand, since the fibers are not necessarily continuous in the circumferential direction, heat and electricity are hardly transmitted (low thermal conductivity and high electrical resistivity). Thus, by giving orientation to the carbon fiber, the soaking member 36 can function as an anisotropic material, and the physical property value in each direction can be adjusted with a high degree of freedom.

  When a high frequency current is supplied to the coil 32, a varying magnetic field is generated around the coil 32. Induction heating uses Joule heat of eddy current flowing in the circumferential direction by the electromagnetic induction effect at this time. In the present embodiment, the electrical resistivity in the circumferential direction of the heat equalizing member 36 is higher than that of the roller body 31 (outer cylinder portion 33) (see FIG. 3). For this reason, more eddy current flows through the outer cylindrical portion 33 than the heat equalizing member 36, and more Joule heat due to the eddy current is generated in the outer cylindrical portion 33 than the heat equalizing member 36. Note that, due to the skin effect, eddy current is generated mainly in the vicinity of the inner peripheral surface of the outer cylindrical portion 33.

  Moreover, in this embodiment, the heat conductivity of the axial direction of the soaking | uniform-heating member 36 is higher than the roller main body 31 (outer cylinder part 33) (refer FIG. 3). For this reason, the temperature distribution in the axial direction of the heat equalizing member 36 is likely to be uniform, and the temperature distribution in the axial direction can be made uniform also in the outer cylindrical portion 33 in contact with the heat equalizing member 36. A specific numerical value of the thermal conductivity in the axial direction of the heat equalizing member 36 is preferably, for example, 200 W / (m · K) or more. Furthermore, in the present embodiment, the heat capacity of the heat equalizing member 36 is made smaller than the heat capacity of the outer cylindrical portion 33 in order to make the temperature distribution of the heat equalizing member 36 uniform quickly.

  In consideration of efficiently increasing the temperature of the roller surface 31a, it is better to make the amount of heat generated in the outer cylindrical portion 33 near the roller surface 31a as large as possible than in the heat equalizing member 36 far from the roller surface 31a. . However, the heat equalization member 36 may generate some heat, and when the heat equalization member 36 generates heat, the heat generation amount is preferably smaller than the heat generation amount in the outer cylindrical portion 33.

(effect)
As described above, the induction heating roller 30 of the present embodiment is provided with the heat equalizing member 36 so as to be in contact with the inner peripheral surface of the outer cylindrical portion 33 of the roller main body 31. The thermal conductivity is higher than that of the outer cylinder portion 33. For this reason, the temperature distribution in the axial direction of the heat equalizing member 36 is likely to be uniform, and the temperature distribution in the axial direction can be made uniform also in the outer cylindrical portion 33 in contact with the heat equalizing member 36. In addition, since the electrical resistivity of the heat equalizing member 36 is higher than that of the outer cylindrical portion 33 in the circumferential direction, eddy current due to electromagnetic induction flows through the outer cylindrical portion 33 more than the heat equalizing member 36, and the outer cylindrical portion 33. Induction heating in is promoted. For this reason, the part closer to the roller surface 31a than the soaking member 36 is heated more, and the roller surface 31a can be efficiently heated. Moreover, since the heat pipe can be omitted by providing the soaking member 36, the thickness of the outer cylinder portion 33 of the roller body 31 can be reduced. As a result, the heat capacity of the outer cylinder part 33 is reduced, and the temperature of the entire outer cylinder part 33 is likely to rise, so that the roller surface 31a that is the outer peripheral surface of the outer cylinder part 33 can be efficiently heated. Thus, according to the induction heating roller 30 of the present embodiment, it is possible to achieve both uniform temperature distribution in the axial direction on the roller surface 31a and efficient temperature increase on the roller surface 31a.

  Here, FIG. 4 is a graph showing the transition of the temperature on the roller surface, and the induction heating roller 30 of the present embodiment and a conventional induction heating roller using a heat pipe as described in Patent Document 2. Are compared. The heater output is the same for both, and shows the transition of temperature until the temperature becomes substantially constant. As apparent from FIG. 4, the induction heating roller 30 of the present embodiment has a higher temperature rise rate than the conventional induction heating roller, and the time until the temperature becomes constant is shorter. That is, it is shown that the roller surface 31a can be efficiently heated by using the induction heating roller 30 of the present embodiment.

  In the present embodiment, the heat equalizing member 36 is a cylindrical member having the same outer diameter as the inner diameter of the outer cylindrical portion 33. For this reason, the soaking | uniform-heating member 36 contacts the internal peripheral surface of the outer cylinder part 33 over a perimeter, and can make uniform the temperature distribution of the roller surface 31a also in the circumferential direction.

  Moreover, in this embodiment, the soaking | uniform-heating member 36 consists of material containing a fiber material. Therefore, since the thermal conductivity in the fiber arrangement direction can be increased, the thermal conductivity and electrical resistivity of the soaking member 36 can be adjusted with a high degree of freedom by changing the length and orientation of the fiber material. it can.

  In the present embodiment, the fiber material is carbon fiber. Carbon fiber is a lightweight material having high thermal conductivity. Therefore, by configuring the heat equalizing member 36 with a material containing carbon fiber, the temperature distribution on the roller surface 31a can be effectively made uniform, and the weight of the induction heating roller 30 as a whole can be reduced.

  In the present embodiment, the carbon fibers are oriented in the axial direction. When the carbon fibers are oriented in the axial direction, the thermal conductivity in the axial direction of the soaking member 36 is increased, so that the temperature distribution in the axial direction of the soaking member 36 tends to be more uniform, and as a result, the roller surface 31a. The temperature distribution in the axial direction at can be made more uniform. In addition, when the carbon fibers are oriented in the axial direction, the electrical resistance in the circumferential direction of the heat equalizing member 36 increases, so that eddy current due to electromagnetic induction flows more through the outer cylindrical portion 33 than in the heat equalizing member 36. become. As a result, induction heating in the outer cylinder portion 33 can be further promoted, and the temperature of the roller surface 31a can be raised more efficiently.

  In the present embodiment, the carbon fiber is a pitch-based carbon fiber. As carbon fibers, pitch-based carbon fibers using pitch and PAN-based carbon fibers using acrylic fibers are known, but pitch-based carbon fibers have higher thermal conductivity than PAN-based carbon fibers. . For this reason, by using the pitch-based carbon fiber, the thermal conductivity of the soaking member 36 can be further increased, and the temperature distribution on the roller surface 31a can be more effectively uniformized.

  Moreover, in this embodiment, the soaking | uniform-heating member 36 consists of a C / C composite (carbon fiber reinforced carbon composite material) which is a composite material of carbon fiber and graphite. The C / C composite has a high thermal conductivity among the composite materials containing carbon fibers and has high heat resistance. Therefore, by adopting the C / C composite as the soaking member 36, the temperature distribution of the roller surface 31a can be more effectively uniformed, and the induction heating roller 30 that can withstand high temperatures can be provided.

  Further, in the present embodiment, the heat capacity of the soaking member 36 is made smaller than the heat capacity of the outer tube portion 33. For this reason, the temperature distribution of the outer cylinder part 33 is equalized more rapidly, and accordingly, the temperature distribution of the roller surface 31a can be equalized more quickly.

(Other embodiments)
The embodiment of the present invention has been described above. However, the form to which the present invention can be applied is not limited to the above-described embodiment, and may be changed as appropriate without departing from the spirit of the present invention, as exemplified below. Can be added.

  In the above embodiment, the heat equalizing member 36 is made of a C / C composite, but instead of the C / C composite, CFRP (carbon fiber reinforced) which is a composite material of carbon fiber and resin (for example, epoxy resin). (Plastic) may be used. CFRP has low heat resistance but is cheaper than C / C composites. Therefore, for example, only the godet rollers 24 and 25 that are tempering rollers having a relatively high set temperature employ a C / C composite as the heat equalizing member 36, and godet rollers 21 to 21 that are preheat rollers having a relatively low set temperature. 23, the cost can be reduced by adopting CFRP as the soaking member 36.

  Further, the carbon fibers constituting the soaking member 36 may be PAN-based carbon fibers using acrylic fibers instead of the pitch-based carbon fibers. Moreover, as long as the conditions of physical property values are satisfied, the carbon fibers do not need to be oriented in the axial direction, and may be oriented in the circumferential direction or the spiral direction. Moreover, the short fibers of carbon fibers may be randomly oriented. Even in the case of random orientation, as shown in FIG. 3, the thermal conductivity of the soaking member 36 is higher than that of the outer cylindrical portion 33, and the electrical resistivity of the soaking member 36 is higher than that of the outer cylindrical portion 33. Accordingly, it is possible to achieve both the uniform temperature distribution in the axial direction on the roller surface 31a and the efficient temperature increase of the roller surface 31a. Another advantage is that the short fibers of carbon fibers are less expensive than the long fibers. Furthermore, carbon fiber may be used alone instead of a composite material such as C / C composite or CFRP as long as the shape of the carbon fiber can be appropriately maintained by storing it in a case. Moreover, you may employ | adopt things other than carbon fiber as a fiber material.

  Moreover, you may comprise the soaking | uniform-heating member 36 with metal materials, such as aluminum and copper, for example. In this case, since the thermal conductivity of the heat equalizing member 36 in the axial direction is higher than that of the outer cylindrical portion 33 (see FIG. 5), the temperature distribution in the axial direction of the heat equalizing member 36 tends to be uniform. The temperature distribution in the axial direction can also be made uniform in the outer cylinder portion 33 that is in contact. In addition, since the relative permeability of the heat equalizing member 36 is lower than that of the outer cylindrical portion 33, more magnetic flux flows through the outer cylindrical portion 33 than the heat equalizing member 36, and induction heating in the outer cylindrical portion 33 is promoted. The For this reason, as in the above-described embodiment, it is possible to achieve both uniform temperature distribution in the axial direction on the roller surface 31a and efficient temperature increase on the roller surface 31a. However, since these metal materials have a higher density than the C / C composite, it can be said that the C / C composite is the optimum material for the heat equalizing member 36 in consideration of the weight reduction of the induction heating roller 30.

  In addition, in the case of isotropic materials such as carbon fibers randomly oriented and metal materials such as carbon steel, aluminum, and copper, physical property values such as thermal conductivity, electrical resistivity, and relative magnetic permeability are directions. Regardless of whether it has one numerical value. Therefore, in the case of an isotropic material, it is not particularly meaningful to limit each physical property value to “in the axial direction” or “in the circumferential direction”. It means a numerical value.

  Moreover, in the said embodiment, although the roller main body 31 (outer cylinder part 33) shall consist of carbon steel, the material of the roller main body 31 is not limited to carbon steel. For example, aluminum or copper may be used.

  Moreover, in the said embodiment, although the soaking | uniform-heating member 36 was made into the cylindrical member, comprising in cylindrical shape is not essential. For example, the heat equalizing member 36 may be configured by arranging strip-shaped members obtained by dividing a cylindrical member into a plurality in the circumferential direction in the circumferential direction. By doing so, the manufacturing becomes easier as compared with the case where the cylindrical member is manufactured as a single component. Also, assembly is easy.

  In the above embodiment, since a plurality of yarns Y are wound around one induction heating roller 30, the quality in the plurality of yarns Y can be obtained by uniformizing the temperature distribution in the axial direction of the roller surface 31a. This is also advantageous in that it can reduce the variation of the. However, it goes without saying that the present invention can also be applied to an induction heating roller on which one yarn is wound.

30: Induction heating roller 31: Roller body 32: Coil 33: Outer cylinder part 36: Heat equalizing member

Claims (12)

Coils,
A roller body having a cylindrical outer tube portion arranged on the radially outer side of the coil;
A heat equalizing member disposed on the radially outer side of the coil and on the radially inner side of the outer cylinder part, and in contact with the inner peripheral surface of the outer cylinder part;
With
The thermal conductivity of the soaking member in the axial direction is higher than the thermal conductivity of the outer cylinder part, and the electrical resistivity of the soaking member in the circumferential direction is higher than the electrical resistivity of the outer cylinder part. Induction heating roller characterized by. Coils,
A roller body having a cylindrical outer tube portion arranged on the radially outer side of the coil;
A heat equalizing member disposed on the radially outer side of the coil and on the radially inner side of the outer cylinder part, and in contact with the inner peripheral surface of the outer cylinder part;
With
In the axial direction, the thermal conductivity of the soaking member is higher than the thermal conductivity of the outer tube portion, and the relative permeability of the soaking member is lower than the relative permeability of the outer tube portion. Induction heating roller.   The induction heating roller according to claim 1 or 2, wherein the heat equalizing member is a cylindrical member having the same outer diameter as the inner diameter of the outer cylinder portion.   The induction heating roller according to claim 3, wherein the cylindrical member is divided into a plurality of parts in the circumferential direction.   The induction heating roller according to any one of claims 1 to 4, wherein the heat equalizing member is made of a material including a fiber material.   The induction heating roller according to claim 5, wherein the fiber material is carbon fiber.   The induction heating roller according to claim 6, wherein the carbon fibers are oriented in the axial direction.   The induction heating roller according to claim 6, wherein the carbon fibers are randomly oriented.   The induction heating roller according to claim 6, wherein the carbon fiber is a pitch-based carbon fiber.   The induction heating roller according to any one of claims 6 to 9, wherein the heat equalizing member is made of a carbon fiber reinforced carbon composite material which is a composite material of the carbon fiber and graphite.   The induction heating roller according to any one of claims 6 to 9, wherein the heat equalizing member is made of a carbon fiber reinforced plastic that is a composite material of the carbon fiber and a resin.   The induction heating roller according to any one of claims 1 to 11, wherein a heat capacity of the heat equalizing member is smaller than a heat capacity of the outer cylinder portion.

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