JP2017223264A - Foam roller manufacturing device and foam roller manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foam roller manufacturing device capable of manufacturing a foam roller having high homogeneity with a simple structure.SOLUTION: A foam member is stored and sealed by storage means 2, and heated to suppress volumetric increase in foaming, thereby capable of manufacturing a foam roller having high homogeneity. In this case, since with a cylinder body 211 and a core body 221 of the storage means 2 as electrodes, voltage is applied therebetween for heating, the whole device can be simplified compared to, for example, a structure where heating means is arranged inside the storage means, thereby capable of manufacturing the foam roller having high homogeneity with a simple structure.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a foaming roller manufacturing apparatus and a foaming roller manufacturing method.

  In general, in a fixing device provided in an image forming apparatus or the like, a cylindrical foam roller may be used as a pressure roller (or a fixing roller), and such a foam roller is a mixture of a foam material and a water material ( It is manufactured by heating and curing a foamed member.

  Depending on the heating method of the foamed member, the foamed state in the foaming roller may become non-uniform in the axial direction. When such a foaming roller is rotated in the fixing device, the opposing fixing film, sleeve, belt or the like (hereinafter simply referred to as “belt or the like”) moves toward one side in the axial direction (that is, the belt). There was a possibility that a shift would occur. By the way, for the purpose of obtaining a uniform resin foam, a method using dielectric heating has been proposed (for example, Patent Document 1). In the foaming method of the resin foam described in Patent Document 1, the foamed member is foamed and cured by irradiating the foamed member with high-frequency microwaves.

  When the foaming member is foamed by the method described in Patent Document 1, the volume increases as the water evaporates. It is necessary to accommodate the foamed member and irradiate high frequency microwaves. However, when a high frequency microwave is irradiated from the outside using a metal container as a sealed container that can withstand such an increase in volume, the microwave is reflected by the container. Moreover, when it is going to provide a microwave irradiation apparatus in a container, an apparatus will be complicated.

  An object of the present invention is to provide a foam roller manufacturing apparatus capable of manufacturing a highly uniform foam roller with a simple configuration.

  The invention according to claim 1 is a foaming roller manufacturing apparatus for manufacturing a foaming roller by heating the foaming member in order to solve the above-described problem, and a housing unit that seals the foaming member while housing the foaming member, Heating means for heating the foamed member, wherein the housing means is a cylindrical outer cylinder member, a cylindrical or columnar core member arranged while being spaced apart from the inside of the outer cylindrical member, and the outer cylinder A gap holding means for holding a gap between the member and the core member, and a cap member that closes an end of the outer cylinder member. The outer cylinder member includes a conductive cylinder body, and A cylindrical insulating layer laminated on the inner peripheral surface, and the core member has a conductive core main body and a core insulating layer laminated on the outer peripheral surface of the core main body, and the heating means Is characterized in that an alternating voltage is applied between the cylinder body and the core body as electrodes. A foam roller manufacturing apparatus for a.

  According to the foaming roller manufacturing apparatus of the present invention, the foaming member is sealed while being accommodated by the accommodating means, and the foaming member is heated by applying a voltage between the cylindrical body and the core body of the accommodating means as electrodes. Thus, a highly uniform foaming roller can be manufactured with a simple configuration.

It is sectional drawing which shows the foaming roller manufacturing apparatus which concerns on 1st Embodiment of this invention. It is a front view which shows the fixing device in which the foaming roller manufactured by the said foaming roller manufacturing apparatus is used. It is the front view and side view which show the pressure roller of the said fixing device. It is sectional drawing which shows typically the heating principle of the said foaming roller manufacturing apparatus. It is sectional drawing which shows typically the foaming member before the heating accommodated in the accommodating means of the foaming roller manufacturing apparatus. It is a block diagram which shows the foaming roller manufacturing apparatus which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the principal part of the said foaming roller manufacturing apparatus. It is a flowchart which shows an example of the heat processing which the said foaming roller manufacturing apparatus performs. It is a flowchart which shows an example of the separate temperature control process which the said foaming roller manufacturing apparatus performs in the said heat processing. It is a graph which shows the relationship between the axial direction temperature difference in the accommodating means of the said foaming roller manufacturing apparatus, and the moving amount | distance of the manufactured foaming roller. It is sectional drawing which shows the foaming roller manufacturing apparatus which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the foaming roller manufacturing apparatus which concerns on 4th Embodiment of this invention.

  Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In the second to fourth embodiments, the same constituent members as those described in the first embodiment and the constituent members having similar functions are denoted by the same reference numerals as those in the first embodiment and the description thereof is omitted.

[First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings. As shown in FIG. 1, the foaming roller manufacturing apparatus 1 </ b> A of the present embodiment includes a housing unit 2 that seals the foaming member E while housing the foaming member E, and a heating unit 3 that heats the foaming member E.

  The foaming roller manufacturing apparatus 1 </ b> A of the present embodiment manufactures a foaming roller by heating the foaming member E filled in the housing unit 2. This foaming roller is used for, for example, a pressure roller 101 of a fixing device 100 as shown in FIG. A foam roller may be used as the fixing roller 102 of the fixing device 100.

  The fixing device 100 includes a pressure roller 101, a fixing roller 102 facing the pressure roller 101, a tension roller 103, a driven roller 104, a fixing roller 102, a tension roller 103, and a driven roller 104. Belt 105. As the paper passes between the pressure roller 101 and the fixing roller 102, the toner is fixed on the paper.

  As shown in FIG. 3, the pressure roller 101 includes a roller metal core 101A serving as a rotation shaft, an outermost release layer 101B, an elastic layer 101C between the roller metal core 101A and the release layer 101B, And grip portions 101D provided at both ends in the axial direction. The release layer 101B suppresses the toner from adhering to the pressure roller 101 to enhance the releasability, and the grip portion 101D suppresses the slip of the paper to improve the paper feeding property.

  The elastic layer 101C is configured by a foam roller. As a result, when the toner is heated and pressed, it is possible to improve heat insulation and to form a good nip portion.

  The accommodating means 2 includes a cylindrical outer cylinder member 21, a cylindrical core member 22 that is arranged inside the outer cylinder member 21 while being spaced apart, and two cap members 23 that block both ends of the outer cylinder member 21. The whole is formed in a bottomed cylindrical shape. In this embodiment, let the axial direction of the outer cylinder member 21 be a Z direction, and let two directions orthogonal to a Z direction be an X direction and a Y direction.

  The outer cylinder member 21 has a conductive cylinder main body 211 and a cylinder insulating layer 212 laminated on the inner peripheral surface of the cylinder main body 211. The core member 22 includes a conductive core main body 221 and a core insulating layer 222 stacked on the outer peripheral surface of the core main body 221. The space | interval of the outer cylinder member 21 and the core member 22 should just be hold | maintained, for example by attaching the cap member 23 (Namely, the cap member 23 should just function as a space | interval holding means). The outer cylinder member 21 and the core member 22 may be formed integrally with the one cap member 23. Moreover, the core member 22 may be formed in the column shape.

  The cap member 23 is attached to the end portions of the outer cylinder member 21 and the core member 22. Thereby, an accommodating space S that can be sealed while accommodating the foamed member E is formed between the outer cylinder member 21, the core member 22, and the cap member 23. An injection port for injecting the foaming member E is formed in the outer cylinder member 21, and the foaming member E may be filled into the accommodation space S from the injection port.

  The foamed member E accommodated in the accommodation space S is in contact with the cylindrical insulating layer 212 and the core insulating layer 222 and is not in direct contact with the conductive cylindrical main body 211 and the core main body 221.

  The heating unit 3 applies an alternating voltage between two electrodes, and includes, for example, a DC power source and a switch unit that reverses the direction of the voltage. The heating means 3 may be an AC power source. The power source constituting the heating means 3 has one end connected to the cylinder main body 211 of the outer cylinder member 21 and the other end connected to the core main body 221 of the core member 22. That is, the heating means 3 applies an alternating voltage between the conductive cylinder main body 211 and the core main body 221 as electrodes. Moreover, it is preferable that the heating means 3 can change a voltage with the frequency within the range of about 300 MHz-300 GHz which is a frequency band which can heat water effectively.

  Here, a mode that the foaming member E is heated by the heating means 3 is typically shown in FIG. First, as shown in FIG. 4A, when the cylinder main body 211 has a higher voltage than the core main body 221, the water (foaming material that is a liquid dielectric) W in the foam member E is transferred to the cylinder main body 211. Polarization is performed so that the side becomes negative and the core body 221 side becomes positive. As shown in FIG. 4B, when the cylinder body 211 has a lower voltage than the core body 221, the water W in the foamed member E is positive on the cylinder body 211 side and the core body 221 side is positive. Polarize to be negative.

  When an alternating voltage is applied by the heating unit 3, the states shown in FIGS. 4A and 4B are alternately repeated. At this time, dielectric loss occurs in the water W, and the entire foamed member E is heated by this dielectric loss.

  Hereinafter, an example of a procedure (foaming roller manufacturing method) for manufacturing the foaming roller by the foaming roller manufacturing apparatus 1A will be described.

  First, a rubber material (curing material) and a water material (foaming material) are mixed at an appropriate ratio to prepare an emulsion. For example, VMQ (vinyl methyl silicone rubber) manufactured by Toray Dow Corning Co., Ltd. is used as the rubber material, and this is divided into two liquids (A liquid and B liquid) having different formulations (catalyst, cross-linking material, etc.). Liquid A, liquid B, and water material are mixed at a compounding ratio (mass ratio) 1: 1: 2, and a W / O type as shown in FIG. 5A (water material 402 is dispersed in rubber material 401). An emulsion 400 is prepared.

  When such an emulsion 400 is heated as described later, the water material 402 evaporates to form bubbles in the rubber material 401 and the rubber material 401 is cured. At this time, the bubbles communicate with each other by breaking the wall between the bubbles adjacent to each other, and a continuous bubble structure as shown in FIG. 5B is formed.

  The emulsion 400 as described above is accommodated in the accommodating space S of the accommodating means 2 as the foamed member E, and heated by applying a voltage by the heating means 3. As a result, the rubber material 401 is cured. The foamed roller is formed by taking out the hardened rubber material 401 from the housing means 2 and performing appropriate processing such as cutting.

  According to this embodiment, there are the following effects. That is, the foaming member is hermetically sealed while being accommodated by the accommodating means 2, and the foaming member is heated, so that an increase in volume during foaming can be suppressed and a highly uniform foaming roller can be manufactured. Thereby, when such a foaming roller is used in a fixing device and is rotated opposite to a belt or the like, the belt shift can be reduced.

  At this time, by applying a voltage between the cylindrical main body 211 and the core main body 221 of the accommodating means 2 and heating them (that is, using a part of the accommodating means 2 as an electrode for heating), for example, Compared with a configuration in which the heating unit is arranged inside the housing unit, the entire apparatus can be simplified, and a highly uniform foaming roller can be manufactured with a simple configuration.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 6 and 7, the foaming roller manufacturing apparatus 1 </ b> B of the present embodiment includes a housing unit 2 </ b> B that seals the foaming member while housing it, a heating unit 3 that heats the foaming member, and a temperature inside the housing unit. Temperature measuring means 4 for measuring the temperature and control means 5 for controlling the heating means.

  The accommodating means 2B in the present embodiment is obtained by dividing the cylindrical main body 211 and the core main body 221 of the accommodating means 2 in the first embodiment into the same number in the Z direction. That is, the cylinder main body 211 and the core main body 221 of the accommodating means 2B have the same number of electrode portions 211A and 221A divided in the axial direction. The electrode portions 211A and 221A adjacent in the axial direction may be insulated from each other. In addition, the electrode portion 211 </ b> A of the cylinder main body 211 and the electrode portion 221 </ b> A of the core main body 221 that are disposed to face each other constitute an electrode pair 20. The cylinder insulating layer 212 and the core insulating layer 222 may be divided in the axial direction or may not be divided.

  The plurality of electrode pairs 20 arranged in the Z direction heats the foam member positioned between them. Therefore, by applying an appropriate voltage to each of the plurality of electrode pairs 20 by the heating means 3, the heating intensity at each position in the Z direction of the accommodation space S can be set appropriately.

  The temperature measuring unit 4 includes, for example, a plurality of thermocouples (temperature measuring units) 41, and the thermocouples 41 are arranged at intervals along the axial direction with respect to the housing unit 2B. Specifically, each thermocouple 41 corresponds to each of the plurality of electrode parts 211A and 221A arranged in the Z direction, and between the electrode part 211A and the cylinder insulating layer 212 in the outer cylinder member 21, and the core member The thermocouple 41 is disposed between the electrode portion 221 </ b> A and the core insulating layer 222 in FIG. Thereby, the temperature measuring means 4 can measure the temperature of each position along the axial direction inside the accommodating means 2.

  The control unit 5 is connected to the heating unit 3 and the temperature measuring unit 4 by wire or wirelessly, receives information about the measurement result from the temperature measuring unit 4 and transmits a control signal to the heating unit 3. . That is, the control unit 5 controls the voltage applied by the heating unit 3 to each of the plurality of electrode portions 211A and 221A based on the measurement result of the temperature measuring unit 4. Thereby, for example, by increasing the heating intensity at a position where the temperature is low in the accommodation space S or by reducing the heating intensity at a position where the temperature is high, the temperature in the Z direction of the accommodation space S can be kept uniform. it can.

  Here, an example of the control of the heating means 3 by the control means 5 will be described with reference to FIGS. The control means 5 starts the heating process upon receiving a heating start command. First, the control means 5 applies an equal voltage to the plurality of electrode pairs 20 (step S1), and continues heating for a predetermined time (step S2).

  Next, the control means 5 calculates the average value of the measured temperature of each part received from the temperature measuring means 4 (step S3), and determines whether this average value is equal to or higher than the set temperature (step S4). Here, the set temperature may be, for example, the curing temperature of the rubber material in the foamed material, or may be an appropriate temperature before and after the curing temperature. When the average value of the measured temperatures is equal to or higher than the set temperature (Y in step S4), the control unit 5 ends the heating by the heating unit 3 (step S5) and ends the heating process. Note that heating may be continued for a predetermined time before step S5.

  On the other hand, when the average value of the measured temperatures is less than the set temperature (N in step S4), the control means 5 starts the individual temperature adjustment process shown in FIG. 9 (S6). The individual temperature adjustment process is performed independently for each of the plurality of electrode pairs 20. The control means 5 first determines whether or not the local temperature (measured temperature of the thermocouple 41 corresponding to each electrode pair 20) is higher than the average temperature (average value of measured temperatures) (step S11).

  When the local temperature is higher than the average temperature (Y in Step S11), the control unit 5 decreases the voltage applied to the electrode pair 20 (Step S12). The amount of voltage decrease may be a constant value or may be determined based on the difference between the local temperature and the average temperature.

  When the local temperature is equal to or lower than the average temperature (N in Step S11), the control unit 5 determines whether or not the local temperature is lower than the average temperature (Step S13). When the local temperature is lower than the average temperature (Y in Step S13), the control unit 5 increases the voltage applied to the electrode pair 20 (Step S14). The amount of voltage increase may be a constant value or may be determined based on the difference between the local temperature and the average temperature.

  After step S14 or when the local temperature is equal to or higher than the average temperature (N in step S13), that is, when the local temperature is equal to the average temperature, the control means 5 terminates the individual temperature adjustment process and starts the heating process again. Return. In the heating process, after the individual temperature adjustment process (step S6), the control means 5 returns to step S2.

  By performing the heat treatment as described above, the applied voltage is adjusted so that the local temperature approaches the average temperature. That is, the temperature of the entire accommodation space S rises and the foam member is heated so that a temperature difference in the Z direction hardly occurs.

  Here, the axial temperature difference in the storage means 2 (temperature difference between the upper and lower cap members 23), the amount of belt shift (movement amount) when the foaming roller produced under each condition is used in the fixing device, FIG. 10 is a graph in which the relationship is experimentally determined. In this example, it can be read that the smaller the axial temperature difference, the smaller the movement amount.

  Note that, depending on conditions such as the shape and arrangement of the storage means 2, the moving amount may be minimized when the axial temperature difference becomes a predetermined value. In such a case, the heating means 3 may be controlled so that the accommodation space S has a predetermined temperature gradient in the Z direction.

  According to this embodiment, in addition to the effects of the first embodiment, there are the following effects. That is, the temperature measuring unit 4 measures the temperature of each of a plurality of locations divided in the axial direction inside the housing unit, and the control unit 5 measures each of the plurality of electrode portions 211A and 221A divided in the axial direction. By controlling the applied voltage, the foamed state can be made uniform.

  For example, even if the distribution of the dielectric (water) to be heated in the foamed member becomes non-uniform and the portion where the dielectric is gathered tends to be concentrated and heated, the foamed member in the axial direction Heating can be performed while maintaining a uniform temperature.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 11, the foaming roller manufacturing apparatus 1 </ b> C of the present embodiment includes an accommodation unit 2, a heating unit 3, two end heating units 6 that heat the upper and lower cap members 23, and an end temperature measurement. Means 7.

  The end heating means 6 is a heater, for example, and is arranged in the vicinity of the cap member 23 or arranged so as to come into contact therewith. The two end heating means 6 can be controlled independently of the heating means 3 and are controlled independently of each other.

  The end temperature measuring means 7 is provided so as to measure the temperature of the cap member 23. Based on the measurement result of the end temperature measuring means 7, the heating intensity of the end heating means 6 may be adjusted so that the temperature difference between the central portion and the end portion in the axial direction of the accommodation space S is reduced. For example, as in the second embodiment, the average temperature is obtained, and the end heating means 6 may be controlled so that the average temperature is equal to the temperature of the cap member 23.

  According to this embodiment, in addition to the effects of the first embodiment, there are the following effects. That is, by heating the cap member 23 by the end heating means 6, it is possible to suppress the heat of the accommodation space S being absorbed by the cap member 23 and the temperature of the end portion from being lowered, and the axial direction of the accommodation space S. The temperature difference between the central portion and the end portion in the can be reduced. Thereby, a foaming state can be made more uniform.

[Fourth Embodiment]
Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 12, the foaming roller manufacturing apparatus 1D of the present embodiment heats the housing means 2, the heating means 3, the end heating means 6, the end temperature measuring means 7, and the cylinder body 211 from the outside. And an electrode heating means 8 for performing.

  The electrode heating means 8 is a heater, for example, and is provided in a cylindrical shape so as to cover the outer periphery of the accommodating means 2. That is, the electrode heating means 8 is disposed in the vicinity of the cylinder main body 211 as an electrode or disposed so as to come into contact. The electrode heating means 8 may be heated so that the cylinder main body 211 has the same temperature as the temperature in the accommodation space S. For example, the electrode heating means 8 may be heated with the same output as the output of the heating means 3, or the temperature in the vicinity of the electrode heating means 8 is measured, and this measured temperature is obtained in the second embodiment. The output may be adjusted to be equal to the average temperature.

  According to this embodiment, in addition to the effects of the first embodiment, there are the following effects. That is, by heating the cylinder main body 211 by the electrode heating means 8, it is possible to suppress the heat of the accommodation space S from being absorbed by the cylinder main body 211 and to reduce the temperature outside in the radial direction. The temperature difference between inside and outside can be reduced. Thereby, a foaming state can be made more uniform.

  In addition, this invention is not limited to the said embodiment, Including other structures etc. which can achieve the objective of this invention, the deformation | transformation etc. which are shown below are also contained in this invention.

  For example, in the fourth embodiment, the electrode heating means 8 for heating the cylinder body 211 from the outside is provided. However, in addition to or instead of the electrode heating means 8, the core body 221 is replaced with the core body 221. An electrode heating means for heating from the inside may be provided. According to such a configuration, by heating the core body 221 by the electrode heating means, the core body 221 prevents the heat in the housing space S from being absorbed and the temperature inside the radial direction is reduced, and the housing is accommodated. The temperature difference between the inside and the outside in the radial direction of the space S can be reduced. Thereby, a foaming state can be made more uniform.

  In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the present invention has been illustrated and described primarily with respect to particular embodiments, but the present invention is not limited to the embodiments described above without departing from the scope of the technical idea and object of the present invention. The trader can add various modifications.

  Therefore, the description which limited the shape, the material, etc. disclosed above is exemplary for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of some or all of those shapes, materials, etc. is included in this invention.

<Examples and Comparative Examples>
The foaming rollers of Examples and Comparative Examples were manufactured and their characteristics were evaluated. The foaming rollers of Examples and Comparative Examples have dimensions of a diameter (outer diameter) of 35 mm, a wall thickness of 5.5 mm, and a total length of 385 mm.

  The foaming roller manufactured by the foaming roller manufacturing apparatus 1A of the first embodiment is referred to as Example 1, the foaming roller manufactured by the foaming roller manufacturing apparatus 1B of the second embodiment is referred to as Example 2, and the foaming roller of the third embodiment is used. The foaming roller manufactured by the foaming roller manufacturing apparatus 1C is referred to as Example 3, and the foaming roller manufactured by the foaming roller manufacturing apparatus 1D of the fourth embodiment is referred to as Example 4.

  Moreover, what was hardened | cured by heating the metal mold | die with which the foaming material was filled with the external heating apparatus (furnace) (namely, heat-hardened by the hot air furnace system) is used as the foaming roller of a comparative example.

  The axial temperature difference (temperature difference between the upper and lower ends), the radial temperature difference (internal and external temperature difference) when manufacturing the foam rollers of Examples 1 to 3 and the comparative example, and these foam rollers as a fixing device The amount of belt deviation when used (when rotated a predetermined number of times with a predetermined pressing force) was evaluated. These characteristics are shown in Table 1 together with reference values.

  Regarding the foaming rollers of Examples 1 to 3, the axial temperature, the radial temperature, and the belt side were all below the reference value, and good results were obtained. On the other hand, regarding the foam roller of the comparative example, the axial temperature, the radial temperature, and the belt side all exceeded the reference values.

DESCRIPTION OF SYMBOLS 1A-1D Foaming roller manufacturing apparatus 2, 2B accommodation means 21 Outer cylinder member 211 Cylinder main body 211C Electrode part 212 Cylinder insulation layer 22 Core member 221 Core body 221C Electrode part 222 Cylinder insulation layer 3 Heating means 4 Temperature measuring means 5 Control means 6 Edge heating means 8 Electrode heating means

JP 2005-097508 A

Claims (6)

A foaming roller manufacturing apparatus for manufacturing a foaming roller by heating a foaming member,
Storage means for sealing the foamed member while storing;
Heating means for heating the foamed member,
The accommodation means includes a cylindrical outer cylinder member, a cylindrical or columnar core member that is arranged while being spaced apart from the inner cylinder member, and an interval that holds an interval between the outer cylinder member and the core member. Holding means, and a cap member that closes an end of the outer cylinder member,
The outer cylinder member has a conductive cylinder main body, and a cylinder insulating layer laminated on the inner peripheral surface of the cylinder main body,
The core member has a conductive core body, and a core insulating layer laminated on the outer peripheral surface of the core body,
The said heating means uses the said cylinder main body and the said core main body as an electrode, and applies an alternating voltage between these, The foaming roller manufacturing apparatus characterized by the above-mentioned. A temperature measuring unit having a plurality of temperature measuring units arranged at intervals along the axial direction with respect to the housing unit;
Control means for controlling the heating means,
The tube body and the core body have the same number of electrode portions divided in the axial direction,
The foaming roller manufacturing apparatus according to claim 1, wherein the control unit controls a voltage applied to each of the plurality of electrode units by the heating unit based on a measurement result of the temperature measuring unit.   The foaming roller manufacturing apparatus according to claim 1, further comprising an end heating unit that heats the cap member.   The foaming roller manufacturing apparatus according to any one of claims 1 to 3, further comprising electrode heating means for heating the cylinder body from the outside or heating the core body from the inside. A foam roller production method for producing a foam roller by heating a foam member,
The foaming member is a cylindrical outer cylinder member, a cylindrical or rod-shaped core member that is arranged while being separated from the inner side of the outer cylindrical member, and an interval that maintains an interval between the outer cylindrical member and the core member. A holding means and a cap member that closes an end of the outer cylinder member;
The outer cylindrical member has a conductive cylindrical body with a cylindrical insulating layer laminated on the inner peripheral surface thereof, and the conductive core main body with a core insulating layer laminated on the outer peripheral surface of the core member as electrodes. A foaming roller manufacturing method, wherein the foaming member is heated by applying an alternating voltage between the two.   The foaming roller manufacturing method according to claim 5, wherein a member containing a foaming material that is a liquid dielectric is used as the foaming member.

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