JP2016070880A - Temperature measurement method for rubber for tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature measurement method for measuring the temperature of a rubber in a part where a frictional force actually acts.SOLUTION: A temperature measurement method for a rubber 12 includes a process (1) for allowing the rubber 12 and a measurement plate 4 transmitting an electromagnetic wave 22 radiated from the rubber 12 to come into contact with each other, a process (2) for sliding the rubber 12 against the measurement plate 4, and a process (3) for measuring the intensity of the electromagnetic wave 22 transmitted through the measurement plate 4 by a temperature measuring device 6, to measure the temperature of the rubber 12. Preferably, the measurement plate 4 is formed so that a wavelength band where transmissivity with respect to the measurement plate 4 is 70% or more exists in the electromagnetic wave 22 from the rubber 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for measuring the temperature of rubber used in a tire.

  The frictional characteristics of the rubber that constitutes the tire affect steering stability and braking force. The frictional properties of this rubber affect the tire life and rolling resistance. It is important to accurately measure the friction characteristics of this rubber.

  Dynamic friction testers are often used to measure the friction characteristics of rubber for tires. This tester has a rotating plate and a main body. Rubber to be measured is set on the rotating plate. This rubber is brought into contact with a measurement surface such as a road surface. The main body applies a desired load to the rubber and rotates the rotating plate. The main body measures the sliding resistance between the rubber and the measurement surface at this time. If a dynamic friction tester is used, the resistance of rubber sliding on the measurement surface at a desired speed can be measured in a state where a desired load is applied.

  When frictional force acts between the tire and the road surface, the tire generates heat. The tire temperature rises. Temperature has a great influence on the friction characteristics of the tire. To measure the friction characteristics, it is important to know the temperature of the rubber at that time. Temperature cannot be measured with a dynamic friction tester. For this reason, a means for measuring the temperature of the rubber is necessary. Attempts to simultaneously measure the friction characteristics and temperature of rubber are disclosed in Japanese Patent Application Laid-Open Nos. 2005-233797 and 2007-218746.

  In the apparatus disclosed in Japanese Patent Application Laid-Open No. 2005-233797, the friction characteristic is measured by rotating rubber to be tested on a test table, and the temperature of the rubber is measured by a temperature sensor.

  In the apparatus disclosed in Japanese Patent Application Laid-Open No. 2007-218746, a friction member serving as a test table includes a hole (measurement window) penetrating from the front surface to the back surface. The friction characteristic is measured by sliding the rubber to be tested on the surface of the friction member. At the same time, the temperature of the rubber is measured by the non-contact sensor from the back surface through the measurement window.

JP 2005-233797 A JP 2007-218746 A

  In order to accurately measure the relationship between the friction characteristics of rubber and the temperature, it is necessary to measure the temperature of the rubber in the part where the frictional force actually works. For this purpose, it is necessary to measure the temperature of the portion where the rubber is in contact with the measurement surface. What can be measured by the measuring apparatus disclosed in Japanese Patent Application Laid-Open No. 2005-233797 is the temperature of the rubber that is not in contact with the measurement surface. What can be measured by the apparatus disclosed in Japanese Patent Application Laid-Open No. 2007-218746 is the temperature of the rubber located in the measurement window. In the conventional measurement method, the temperature of the rubber portion actually in contact with the measurement surface could not be measured.

  An object of the present invention is to provide a temperature measurement method for measuring the temperature of rubber in a portion where a frictional force actually works.

  The method for measuring the temperature of rubber according to the present invention includes (1) a step of contacting rubber and a measurement plate that transmits electromagnetic waves radiated from the rubber, and (2) a step of sliding the rubber against the measurement plate. And (3) It has the process of measuring the temperature of the said rubber | gum by measuring the intensity | strength of the said electromagnetic wave which permeate | transmitted the said measurement board with a temperature measuring device.

  Preferably, the measurement plate is formed so that a wavelength band having a transmittance of 70% or more in the electromagnetic wave from the rubber is present.

  Preferably, the wavelength band of the electromagnetic wave having a transmittance of 70% or more with respect to the measurement plate is included in a wavelength band of 0.2 μm to 1.0 mm.

  Preferably, the wavelength band of the electromagnetic wave having a transmittance of 70% or more with respect to the measurement plate includes a wavelength band of 2 μm to 4 μm.

  Preferably, the wavelength band of electromagnetic waves whose intensity can be measured by the temperature measuring device is included in the wavelength band of 0.2 μm to 1.0 mm.

  Preferably, the wavelength band of electromagnetic waves whose intensity can be measured by the temperature measuring device includes a wavelength band of 2 μm to 4 μm.

Preferably, the material of the measurement plate is at least one of Al ₂ O ₃ , Ge, Si, CaF ₂ , BaF ₂ , ZnSe, ZnS, and chalcogenite glass.

Preferably, the material of the measurement plate is Al ₂ O ₃ .

  Preferably, the upper surface of the measurement plate is roughened.

  Preferably, the steps (1) and (2) are performed with a dynamic friction tester.

  The rubber temperature measurement device according to the present invention is a measurement plate that transmits electromagnetic waves radiated from rubber, and the measurement plate that is brought into contact with the rubber and slid thereon, and the measurement plate that has been transmitted through the measurement plate. A temperature measuring device that measures the temperature of the rubber by measuring the intensity of electromagnetic waves of the rubber is provided.

  In the rubber measuring method according to the present invention, there are a measuring plate that transmits electromagnetic waves radiated from rubber, and a temperature measuring device that measures the temperature of the rubber by measuring the intensity of the electromagnetic waves of the rubber that has passed through the measuring plate. Used. This rubber is brought into contact with the measuring plate and is slid against the measuring plate. At the same time, the temperature measuring device measures the intensity of the electromagnetic wave that has passed through the measurement plate and measures the temperature of the rubber. According to this method, the temperature of the rubber in the portion in contact with the measurement plate can be measured. According to this method, the temperature of the rubber in the portion where the frictional force is working can be measured.

FIG. 1 is a cross-sectional view illustrating a state of temperature measurement by a method according to an embodiment of the present invention. FIG. 2 is a perspective view showing some devices used in the temperature measurement of FIG.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  FIG. 1 is a cross-sectional view showing a state of temperature measurement in a temperature measurement method according to an embodiment of the present invention. In FIG. 1, the direction indicated by the arrow X is the upward direction, and the opposite is the downward direction. The apparatus 2 for this temperature measuring method includes a measuring plate 4, a temperature measuring device 6, a measuring table 8, and a friction characteristic measuring device 10. Also shown in FIG. 1 is a rubber 12 to be measured. FIG. 2 is a perspective view showing the measuring plate 4, the temperature measuring device 6, and the measuring table 8 among them.

  The measurement plate 4 is plate-shaped. The measurement plate 4 is placed on the measurement table 8. As shown in the figure, the measurement plate 4 includes a recess 14 on the lower surface side. The thickness between the bottom of the recess 14 and the upper surface 16 of the measurement plate 4 is thinner than the thickness between the upper surface 16 and the lower surface 18 of the measurement plate 4 at a portion where the recess 14 is not present. The portion where the thickness is reduced is referred to as a measurement window 20 of the measurement plate 4. In the figure, the shape of the measurement window 20 is circular in plan view. The shape of the measurement window 20 may not be circular.

  The measurement window 20 of the measurement plate 4 transmits the electromagnetic wave 22 radiated from the rubber 12 by heat radiation. The transmittance of the electromagnetic wave 22 with respect to the measurement plate 4 varies depending on the wavelength of the electromagnetic wave 22. The transmittance of the electromagnetic wave 22 with respect to the measurement plate 4 also varies depending on the material of the measurement plate 4 and the thickness of the measurement window 20. The measurement window 20 of the transmission plate transmits the electromagnetic wave 22 from the rubber 12 to such an extent that the temperature measuring device 6 can measure the temperature of the rubber 12.

  The measurement table 8 is a table on which the measurement plate 4 is placed. A measurement plate 4 is placed on the upper surface of the measurement table 8. The measurement table 8 fixes the measurement plate 4. The center of the upper surface of the measuring plate 4 is open. When the measurement plate 4 is placed on the measurement table 8, the measurement window 20 can be seen from the lower side of the measurement table 8.

  The temperature measuring device 6 measures the temperature of the substance by measuring the intensity of the electromagnetic wave radiated from the substance by thermal radiation. The temperature measuring device 6 is located under the measuring plate 4 placed on the measuring table 8. The temperature measuring device 6 is located under the measuring window 20 of the measuring plate 4. The temperature measuring device 6 measures the intensity of the electromagnetic wave 22 radiated from the rubber 12 and transmitted through the measurement window 20 of the measurement plate 4. Thereby, the temperature measuring device 6 measures the temperature of the rubber 12.

  The friction characteristic measuring instrument 10 includes a rotating plate 24 and a main body 26. The rotating plate 24 is circular. On the lower surface of the rotating plate 24, the rubber 12 to be measured is set. The main body 26 is located above the rotating plate 24. The main body 26 rotates the rotating plate 24. The main body 26 can rotate the rotating plate 24 at a desired speed. The main body 26 can apply a load to the rubber 12 from above the rotating plate 24. The rubber plate 12 is brought into contact with the measurement plate 4, and the rotating plate 24 is rotated in a state where a load is applied to the rubber 12. As a result, the rubber 12 slides with respect to the measurement plate 4. The main body 26 measures the slip resistance between the rubber 12 and the measuring plate 4. The friction characteristic measuring instrument 10 is a dynamic friction tester.

  In the temperature measurement method using this apparatus 2, first, the measurement plate 4 is fixed to the measurement table 8. Under the measurement window 20 of the measurement plate 4, the temperature measuring device 6 is arranged. The rubber 12 to be tested is set on the rotating plate 24 of the friction characteristic measuring instrument 10. This friction characteristic measuring instrument 10 is arranged on the upper surface 16 side of the measuring plate 4. This rubber 12 is brought into contact with the upper surface 16 of the measuring plate 4. The rubber 12 is brought into contact with the measurement window 20 of the measurement plate 4. The rubber 12 is pressed against the measuring plate 4 by the main body 26. A load is applied to the rubber 12 in the direction of the measurement plate 4. The rotating plate 24 is rotated by the main body 26. The rubber 12 rotates. Thereby, the rubber 12 slides with respect to the measurement plate 4. The main body 26 measures the slip resistance at this time. At the same time, the temperature measuring device 6 measures the electromagnetic wave 22 transmitted from the measurement window 20. The temperature measuring device 6 measures the temperature of the rubber 12 in the part in contact with the measuring plate 4. The temperature measuring device 6 measures the temperature of the rubber 12 in the portion where the frictional force is working.

  In the above method, the friction characteristic measuring instrument 10 is used to bring the rubber 12 into contact with the measuring plate 4 and to slide the rubber 12 with respect to the measuring plate 4. The friction characteristic measuring instrument 10 may not be used. For example, the rubber 12 may be manually slid on the measurement window 20 of the measurement plate 4. The temperature of the rubber 12 in the portion where the frictional force is working can be measured. However, at this time, the friction characteristics cannot be measured.

  Hereinafter, the function and effect of the present invention will be described.

  In order to accurately measure the relationship between the friction characteristics of rubber and the temperature, it is necessary to measure the temperature of the rubber in the part where the frictional force actually works. For this purpose, it is necessary to measure the temperature of the portion where the rubber is in contact with the measurement surface. In the conventional measurement method, the temperature of the rubber portion actually in contact with the measurement surface could not be measured.

  In the measuring method of the rubber 12 according to the present invention, the measuring plate 4 that transmits the electromagnetic wave 22 radiated from the rubber 12 and the temperature measuring device 6 that measures the temperature of the rubber 12 by measuring the intensity of the transmitted electromagnetic wave 22. And are used. The rubber 12 is brought into contact with the upper surface 16 of the measuring plate 4 and is slid on the upper surface 16 of the measuring plate 4. At the same time, the temperature measuring device 6 measures the temperature of the rubber 12 by measuring the intensity of the electromagnetic wave 22 transmitted through the measuring plate 4. According to this method, the temperature of the rubber 12 in the portion in contact with the measuring plate 4 can be measured. According to this method, the temperature of the rubber 12 in the portion where the frictional force is working can be measured.

  As described above, the temperature of the rubber 12 is measured by measuring the strength of the electromagnetic wave 22 that has passed through the measurement plate 4. The electromagnetic wave 22 radiated from the rubber 12 preferably includes a wavelength band (referred to as a 70% transmission wavelength band of the measurement plate 4 in this specification) in which the transmittance with respect to the measurement plate 4 is 70% or more. In other words, the measurement plate 4 is preferably formed so that the electromagnetic wave 22 from the rubber 12 has a 70% transmission wavelength band of the measurement plate 4. By measuring the intensity of the electromagnetic wave 22 in this wavelength band, accurate temperature measurement can be performed. Most of the electromagnetic waves 22 emitted from the rubber 12 by heat radiation have a wavelength of 0.1 μm or more and 1.0 mm or less. Therefore, it is preferable that the 70% transmission wavelength band of the measurement plate 4 is included in the wavelength band of 0.2 μm to 1.0 mm.

  In this specification, the “wavelength band from A to B” is hereinafter referred to as “wavelength band (A-B)”. For example, the above “wavelength band having a wavelength of 0.2 μm to 1.0 mm” is described as “wavelength band (0.2 μm−1.0 mm)”.

  The 70% transmission wavelength band of the measurement plate 4 is more preferably included in the wavelength band (2 μm-23 μm). The temperature at which the tire is used is mainly between 0 ° C. and 200 ° C. In this temperature range, the intensity of the electromagnetic wave 22 emitted from the rubber 12 increases when the wavelength is between 2 μm and 23 μm. Since the 70% transmission wavelength band of the measurement plate 4 is included in the wavelength band (2 μm to 23 μm), the measurement plate 4 can transmit the electromagnetic wave 22 having a high strength. This enables accurate temperature measurement.

  More preferably, the 70% transmission wavelength band of the measurement plate 4 includes a wavelength band (2 μm-4 μm). The electromagnetic wave 22 in the wavelength band (2 μm-4 μm) is difficult to be absorbed by water vapor in the atmosphere. In this wavelength band, the electromagnetic wave 22 transmitted through the measurement plate 4 is measured by the temperature measuring device 6 without being absorbed by water vapor. This enables accurate temperature measurement. From this viewpoint, the 70% transmission wavelength band of the measurement plate 4 may include a wavelength band (8 μm to 13 μm).

The material of the measuring plate 4 is Al ₂ O ₃ (sapphire), Ge (germanium), Si (silicon), CaF ₂ (calcium fluoride), BaF ₂ (barium fluoride), ZnSe (zinc selenide), ZnS ( Zinc sulfide) and chalcogenite glass are preferred. These materials have a wavelength band in which the electromagnetic wave 22 can be transmitted satisfactorily in a wavelength band of 2 μm to 23 μm. By using these materials for the measurement plate 4, it is possible to form the measurement plate 4 in which the 70% transmission wavelength band is included in the wavelength band (2 μm to 23 μm).

The material of the measurement plate 4 is more preferably Al ₂ O ₃ . Al ₂ O ₃ transmits the electromagnetic wave 22 having a wavelength of 2 μm to 4 μm very well. By using Al ₂ O ₃ as the material of the measurement plate 4, the measurement plate 4 including a 70% transmission wavelength band including a wavelength band (2 μm-4 μm) can be easily formed. According to this measurement plate 4, accurate temperature measurement is possible.

Al ₂ O ₃ is hard. The measuring plate 4 made of Al ₂ O ₃ has high strength. Even when a load is applied to the rubber 12 in contact with the measurement plate 4, the measurement plate 4 is not easily damaged. Even if the friction characteristics are measured using the measuring plate 4, the measuring plate 4 is not worn. Furthermore, Al ₂ O ₃ has a higher strength against thermal changes and physical impacts than other materials. By using Al ₂ O ₃ as a material, it is possible to form the measurement plate 4 having sufficient strength against thermal changes and physical impacts.

In FIG. 2, the double arrow T is the thickness of the measurement window 20. The thickness T is preferably 4.0 mm or less. By setting the thickness T to 4.0 mm or less, the measurement plate 4 has good transmittance. When the material of the measurement plate 4 is Al ₂ O ₃ , the measurement plate 4 including the 70% transmission wavelength band including the wavelength band (2 μm to 4 μm) can be formed by setting the thickness T to 4.0 mm or less. .

The thickness T is preferably 1.5 mm or more. By setting the thickness T to 1.5 mm or more, the measurement plate 4 has good strength. When the material of the measurement plate 4 is Al ₂ O ₃ , the measurement plate 4 that is not damaged in the wear characteristic test can be formed by setting the thickness T to 1.5 mm or more.

  The upper surface 16 of the measurement plate 4 is preferably roughened. An enlarged view of the upper surface 16 of the measuring plate 4 is shown in FIG. This enlarged view shows a state in which the upper surface 16 has been roughened. By roughing the upper surface 16 of the measuring plate 4, the friction coefficient can be increased. The coefficient of friction depends on the rough surface roughness of the measuring plate 4. By preparing the measuring plate 4 having different rough surface roughnesses, it is possible to measure the temperature of the rubber 12 where friction occurs under various friction coefficients.

Shot blasting and sand blasting are suitable for roughing the measurement plate 4. By performing shot blasting or sand blasting on the upper surface 16 of the measuring plate 4, the measuring plate 4 having a desired rough surface roughness can be easily formed. When the material of the measurement plate 4 is Al ₂ O ₃ , silicon carbide grains are preferable as the blast material to be sprayed onto the upper surface 16 of the measurement plate 4 by shot blasting. The silicon carbide grains can form a rough surface even on the measuring plate 4 made of Al ₂ O ₃ . By changing the particle size of silicon carbide, the roughness of the rough surface can be changed.

  The lower surface 18 of the measuring plate 4 is preferably mirror-finished. The transmittance of the electromagnetic wave 22 can be improved by mirror-treating the lower surface 18 of the measurement plate 4. This measuring plate 4 has a good transmittance.

  As described above, most of the electromagnetic wave 22 emitted from the rubber 12 by thermal radiation has a wavelength of 0.1 μm or more and 1.0 mm or less. The wavelength band of the electromagnetic wave 22 whose intensity can be measured by the temperature measuring device 6 is preferably included in the wavelength band (0.2 μm-1.0 mm).

The wavelength band of the electromagnetic wave 22 that can be measured by the temperature measuring device 6 preferably includes the 70% wavelength band of the measurement plate 4. Thereby, the electromagnetic wave 22 with strong intensity | strength can be measured. According to this temperature measuring device 6, temperature measurement with high accuracy is possible. As described above, by using Al ₂ O ₃ as the material of the measurement plate 4, the measurement plate 4 having a 70% transmission wavelength band including a wavelength band (2 μm to 4 μm) can be formed. When this measuring plate 4 is used, the wavelength band of the electromagnetic wave 22 that can be measured by the temperature measuring device 6 preferably includes the wavelength band (2 μm-4 μm).

  The temperature measuring device 6 is preferably a thermography equipped with a camera. The temperature distribution on the surface of the rubber 12 can be measured within the range photographed by this camera. The camera preferably has a magnifying lens. By using this lens, the temperature distribution on the surface of the rubber 12 can be measured in smaller area units. By changing the magnification of the camera, the temperature distribution can be measured with a desired fineness of area.

  The temperature measuring device 6 preferably has a function capable of continuous photographing. By continuously photographing the surface of the rubber 12, when the rubber 12 is slid on the measuring plate 4, a change in the surface temperature of the rubber 12 with time can be measured. By changing the frame rate (the number of images taken per second), the change in surface temperature according to the speed at which the rubber 12 slides can be measured.

  As described above, it is preferable to use a dynamic friction tester to bring the rubber 12 into contact with the upper surface 16 of the measuring plate 4 and to slide the rubber 12 with respect to the measuring plate 4. By using a dynamic friction tester, it is possible to measure slip resistance according to a desired load and a desired slip speed. By changing the rough surface roughness of the measuring plate 4, the slip resistance can be measured under different friction coefficients. By dampening the measurement plate 4, it is possible to measure the slip resistance when the measurement plate 4 is wet. By using a dynamic friction tester in this temperature measurement method, the temperature of the rubber 12 in the portion where the frictional force is applied can be measured while measuring these friction characteristics.

  Hereinafter, the effects of the present invention will be clarified by examples. However, the present invention should not be construed in a limited manner based on the description of the examples.

[Preparation of rubber]
A rubber was prepared to measure temperature. The composition of this rubber is shown in Table 1. Each component shown in Table 1 was kneaded with a kneading apparatus (Banbury mixer). This was pressed at a temperature of 170 ° C. for 20 minutes and vulcanized. Thereby, a rubber to be measured was obtained.

The details of each component shown in Table 1 are as follows.
1) SBR (styrene butadiene rubber): trade name “E15” manufactured by Asahi Kasei Corporation
2) Carbon Black: Trade name “Diamond Black N220” manufactured by Mitsubishi Chemical Corporation
3) Silica: Trade name “Ultrasil VN3” manufactured by EVONIK-DEGUSSA
4) Oil: Product name “Process X-260” manufactured by Japan Energy Co., Ltd.
5) Coupling agent: Trade name “Si69” manufactured by EVONIK-DEGUSSA
6) Stearic acid: Product name “Kashiwa” manufactured by Nippon Oil & Fats Co., Ltd.
7) Zinc oxide: Trade name “Zinc Hana 1” manufactured by Mitsui Kinzoku Kogyo Co., Ltd.
8) Anti-aging agent: Trade name “Antigen 6C” manufactured by Sumitomo Chemical Co., Ltd.
9) Wax: Trade name “Sannok N” manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.
10) Sulfur: Trade name “Sulfur Powder” manufactured by Karuizawa Smelter Co., Ltd.
11) Vulcanization accelerator: Trade name “Noxeller CZ” manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.
12) Vulcanization accelerator: Trade name “Noxeller D” manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.

[Example 1]
The temperature of the rubber was measured by the measuring method according to the present invention using the temperature measuring device shown in FIG. The measurement conditions are shown in Table 2. In this measurement, a measurement plate made of Al ₂ O ₃ was prepared. The thickness T of the measurement window of this measurement plate is 2 mm. The thickness of the measurement plate at a portion other than the measurement window is 10 mm. The upper surface of the measurement plate is roughened. The rough surface was formed by shot blasting. Silicon carbide (trade name “Shinano Random GC F16” manufactured by Shinano Denki Co., Ltd.) was used as a blast material.

  A dynamic friction tester “DF Tester S type” manufactured by Nihon Sangyo Co., Ltd. was used as a friction characteristic measuring instrument. The rubber was set in this tester. At the time of measurement, the measurement plate was moistened with 20 ° C. water. On the wet measuring plate, the rubber was slid at a speed of 7 km / h. The temperature of the rubber at this time was measured from the measurement window with a temperature measuring device. The environmental temperature at the time of measurement is 20 ° C. A thermography “InfReC H8000” manufactured by Nippon Avionics Co., Ltd. was used as a temperature measuring device. During the measurement, a 15 μm microscope lens was attached. This temperature measuring instrument measures the intensity of electromagnetic waves having a wavelength of 2 μm or more and 5 μm or less.

[Comparative Example 1]
Comparative Example 1 was the same as Example 1 except that soda glass was used as the material for the measurement plate.

[Temperature measurement]
The temperature distribution on the rubber surface was confirmed from the result of the thermography. Table 2 shows the temperatures at the highest temperatures on the rubber surface.
[Measureability]
It was judged from the result of the above-mentioned thermography whether the rubber surface temperature was correctly measured. The results are shown in Table 2.

  As shown in Table 2, the temperature measurement method of the example can measure the temperature where the rubber is in contact with the measurement plate. In the comparative example, the measured temperature is the same as the environmental temperature, and the rubber temperature cannot be measured correctly. From this evaluation result, the superiority of the present invention is clear.

  The method described above can be used to measure the temperature of various tire rubbers.

DESCRIPTION OF SYMBOLS 2 ... Temperature measuring device 4 ... Measuring plate 6 ... Temperature measuring device 8 ... Measuring stand 10 ... Friction characteristic measuring device 12 ... Rubber 14 ... Depression 16 ... Upper surface 18 ... Lower surface 20 ... Measurement window 22 ... Electromagnetic wave 24 ... Rotary plate 26 ... Main body

Claims (11)

(1) A step of contacting rubber with a measurement plate that transmits electromagnetic waves radiated from the rubber,
(2) a step of sliding the rubber against the measurement plate; and (3) a step of measuring the temperature of the rubber by measuring the intensity of the electromagnetic wave transmitted through the measurement plate with a temperature measuring device. Rubber temperature measurement method.   The temperature measurement method according to claim 1, wherein the measurement plate is formed such that a wavelength band in which the transmittance to the measurement plate is 70% or more exists in the electromagnetic wave from the rubber.   The temperature measurement method according to claim 2, wherein the wavelength band of the electromagnetic wave having a transmittance of 70% or more with respect to the measurement plate is included in a wavelength band of 0.2 μm to 1.0 mm.   The temperature measurement method according to claim 2, wherein the wavelength band of the electromagnetic wave that has a transmittance of 70% or more with respect to the measurement plate includes a wavelength band of 2 μm to 4 μm.   The temperature measuring method according to any one of claims 1 to 4, wherein a wavelength band of an electromagnetic wave whose intensity can be measured by the temperature measuring instrument is included in a wavelength band having a wavelength of 0.2 µm to 1.0 mm.   The temperature measuring method according to claim 4, wherein a wavelength band of electromagnetic waves whose intensity can be measured by the temperature measuring instrument includes a wavelength band having a wavelength of 2 µm to 4 µm. The temperature measurement according to any one of claims 1 to 6, wherein a material of the measuring plate is at least one of Al ₂ O ₃ , Ge, Si, CaF ₂ , BaF ₂ , ZnSe, ZnS, and chalcogenite glass. Method. The temperature measurement method according to claim 7, wherein a material of the measurement plate is Al ₂ O ₃ .   The temperature measuring method according to any one of claims 1 to 8, wherein an upper surface of the measuring plate is roughened.   The temperature measuring method according to any one of claims 1 to 9, wherein the steps (1) and (2) are performed by a dynamic friction tester. A measurement plate that transmits electromagnetic waves radiated from rubber, on which the rubber is contacted and slid,
A rubber temperature measuring device comprising: a temperature measuring device that measures the temperature of the rubber by measuring the intensity of electromagnetic waves of the rubber that has passed through the measuring plate.

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