Stain prevention mat for induction cookers

Abstract

To provide a pollution prevention mat for an electromagnetic cooker, in which fastening or breaking is hardly generated.SOLUTION: A pollution prevention mat 1 is formed by one obtained by cutting out a sheet substance 2 in a circular shape. The sheet substance 2 is formed by: a woven fabric 3 as a sheet-like material that is constructed by one obtained by performing a plain weave of a glass fiber having a transparence and heat resistance of a magnetic force wire; and coat materials 4a and 4b formed by a whole surface of both surfaces of the woven fabric 3 and constructed by a silicone having non-transparency and heat resistance. In the sheet substance 2, the maximum strength of a tear strength is 5.0kN / m or more and 240kN / m or less, a thickness of the woven fabric 3 is 0.02 mm or more and 0.42 mm or less, a total of a coating amount of each of the coat materials 4a and 4b is 5 g / m2 or more and 520 g / m2 or less and a coating amount of the coat materials 4a and 4b is 20 g / m2 or more and 570 g / m2 or less, and a total of a coating thickness of each of the coat materials 4a and 4b is 2 μm or more and 300 μm or less and a coating thickness of the coat materials 4a and 4b is 4 μm or more and 330 μm or less, respectively.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This invention relates to a stain-preventing mat for an electromagnetic cooker, and more particularly to a stain-preventing mat for an electromagnetic cooker that prevents stains on the bottom of a pot to be heated, boil-over, etc. from adhering to the top plate of the electromagnetic cooker. [Background technology]

[0002] Patent Document 1 shows a stain prevention mat for an induction cooker that is sandwiched between the top plate of the induction cooker and the bottom of a pot.

[0003] Figure 3 is a plan view showing the external appearance of a conventional stain-preventing mat for an induction cooker when used in a general cooking heating device incorporating an induction cooker, and Figure 4 is a diagram corresponding to the IV-IV line shown in Figure 3, and is a cross-sectional view schematically showing the operating principle of an induction cooker and an enlarged cross-sectional view of a conventional stain-preventing mat for an induction cooker.

[0004] First, referring to Figure 3, induction cookers 13a and 13b are installed on the left and right sides of the front of the top plate 17 of the cooking heating device 61, and a heating wire heater 63, which has nichrome wire embedded in the underside of the top plate 17, is installed behind the top plate 17. Note that depending on the model, the cooking heating device 61 may be equipped with induction cookers instead of the heating wire heater 63 (i.e., equipped with three induction cookers), or may have only two induction cookers without the heating wire heater 63. Also, an intake / exhaust panel 65 is located on the back side of the top plate 17. In this figure, a magnetically permeable, heat-resistant stain-preventing mat 51 is placed over the induction cooker 13b, and a pot 19 to be heated is placed on top of that.

[0005] The schematic structure and heating principle of the induction cooker 13b are shown in Figure 4(1). A magnetic field generating coil 14 constituting the induction cooker 13b is disposed below the top plate 17. When a current flows through the magnetic field generating coil 14 by turning on a switch (not shown), magnetic field lines 15, as indicated by the two-dot chain line, are generated around the magnetic field generating coil 14. These magnetic field lines 15 penetrate the top plate 17 and the stain-preventing mat 51, and also penetrate the bottom of the pot 19 placed on the top plate 17, forming a loop. Because the pot 19 is made of a material with a predetermined electrical conductivity, the generation of the magnetic field lines 15 generates eddy currents 16 in the bottom of the pot. The generated eddy currents 16 are converted into heat by the electrical resistance of the bottom of the pot 19, raising the temperature of the bottom of the pot. This allows the food placed in the pot 19 to be heated without using fire. Furthermore, when the power supply to the magnetic force generating coil 14 is stopped, the magnetic field lines 15 disappear, and the eddy currents 16 generated in the bottom of the pot 19 also disappear. As a result, the temperature of the bottom of the pot 19 drops, and the heating state ends. A temperature sensor 18 is attached below the top plate 17. The temperature sensor 18 monitors the temperature of the top plate 17, and if the temperature of the top plate 17 rises abnormally due to heating without food, for example, a control device (not shown) cuts off the power supply and stops heating.

[0006] Regarding the configuration of the stain-prevention mat 51, with reference to Fig. 4(2), which is an enlarged view of the stain-prevention mat 51 at the "Z" portion of Fig. 4(1), and Fig. 3, the stain-prevention mat 51 is a woven fabric 53 made of glass fiber that is permeable to magnetic lines of force, with water-impermeable, heat-resistant silicone 54a and 54b applied to the entire surface on both sides, which is then cut into a circular shape to form a sheet 52. The stain-prevention mat 51 has cushioning properties because it uses the woven fabric 53 as its central material. In addition, because water-impermeable, heat-resistant silicone 54a and 54b are applied to both sides, the entire stain-prevention mat 51 is water-impermeable and heat-resistant.

[0007] When the stain-prevention mat 51 is used, even if dirt adheres to the bottom of the pot 19 or food splashes onto it, the dirt will not stick directly to the top plate 17, keeping it in a beautiful condition and eliminating the need for cleaning.In addition, to prevent its use from affecting the measurements of the temperature sensor of the induction cooker, the thermal resistance of the sheet body 52 is set within a specified range, which reduces the impact on the temperature sensor that detects the temperature of the top plate, thereby reducing the risk of malfunctions occurring when using the induction cooker. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-140887 Summary of the Invention [Problem to be solved by the invention]

[0009] When a conventional stain-preventing mat 51 such as that described above in Patent Document 1 is placed on an induction cooktop 13a or 13b and heated with a pot 19 on the mat 51, the mat 51 comes into contact with the induction cooktop 13a or 13b at high temperatures. The silicones 54a and 54b in the mat 51 have a chemical structure similar to that of glass, the material of the top plate 17. Therefore, the silicones 54a and 54b located on the top plate 17 side may adhere to the top plate 17, resulting in the silicones 54a and 54b remaining on the top plate 17. If the adhesion is mild, the adhered silicones 54a and 54b can be easily removed by rubbing the adhered area with fingers or a sponge containing detergent. However, if the adhesion is strong, the mat 51 itself may become stuck to the top plate 17 and be impossible to remove from the top plate 17, potentially resulting in the silicones becoming stains on the top plate 17. Furthermore, if the stain-preventing mat 51 is firmly attached, there is a risk that the stain-preventing mat 51 will tear at the attached portion when an attempt is made to peel it off from the top plate 17. In other words, not only the silicone 54a or 54b constituting the stain-preventing mat 51 but also the glass fiber will remain on the top plate 17.

[0010] The present invention has been made to solve the above-mentioned problems, and has as its object to provide a stain-preventing mat for an induction cooker that is less likely to stick or tear. [Means for solving the problem]

[0011] In order to achieve the above object, the invention described in claim 1 is a stain prevention mat for an induction cooker that is used by being sandwiched between the top plate of the induction cooker and the bottom surface of a pot heated by the induction cooker, and is made of a heat-resistant sheet body that is permeable to magnetic lines, and the sheet body has a maximum tear strength of 5.0 kN / m or more. 200.5 kN / m or less, and the sheet body is made of glass fiber and silicone formed on both sides of the glass fiber It is composed of:

[0012] With this configuration, the fabric has a predetermined tear strength. In addition, the stain prevention mat has a predetermined heat resistance and strength, while also having flexibility. The following effect 1 is obtained.

[0013] The invention described in claim 2 is the same as the invention described in claim 1, except that the thickness of the sheet body is 0.74 mm or less.

[0014] With this configuration, effect 2 is obtained in that the influence on the temperature sensor that detects the temperature of the top plate is reduced.

[0015] The invention of claim 3 is the structure of the invention of claim 1 or claim 2, wherein the sheet body comprises a sheet-like material made of heat-resistant fibers and a coating material formed on both sides of the material and having water impermeability, and the material has a thickness of 0.04 mm or more and 0.42 mm or less, and the coating material is On the surface The coating amount is 5g / m 2 End 50 g / m 2 Below is The coating material is 15g / m on the back side. 2 More than 520g / m 2 is It is something.

[0016] With this configuration, effect 3 can be achieved in that cushioning properties and a predetermined tear strength are both achieved, and the influence on the temperature sensor that detects the temperature of the top plate is reduced.

[0017] The invention described in claim 4 is the structure of the invention described in claim 3, wherein the total coating amount of the coating material on the sheet body is 20 g / m 2 More than 570g / m 2 The following is true:

[0018] With this configuration, effect 4 can be obtained, that is, the influence on the temperature sensor that detects the temperature of the top plate is further reduced.

[0019] The invention of claim 5 is the structure of the invention of claim 1 or claim 2, wherein the sheet body comprises a sheet-like material made of heat-resistant fibers and a coating material formed on both sides of the material and having water impermeability, and the material has a thickness of 0.04 mm or more and 0.42 mm or less, and the coating material is On the surface In this case, the coating thickness is 2.9 μm or more 28.6 μm or less The coating thickness on the back side of the coating material is 8.6 μm or more and 297.6 μm or less. It is something.

[0020] With this configuration, effect 5 is obtained in that cushioning properties and a predetermined tear strength are both achieved, and the influence on the temperature sensor that detects the temperature of the top plate is reduced.

[0021] The invention of claim 6 is the structure of the invention of claim 5, wherein the sheet body has a total coating thickness of the coating material of: 11.5 μm or more 326.2 It is μm.

[0022] With this configuration, an effect 6 can be obtained in which the influence on the temperature sensor that detects the temperature of the top plate is further reduced.

[0030] request request 7 The invention described is a stain prevention mat for an induction cooker that is sandwiched between the top plate of the induction cooker and the bottom of a pot heated by the induction cooker. The mat is made of a heat-resistant sheet that is permeable to magnetic lines, and the maximum tear strength of the sheet is 15.0 kN / m or more. 200.5 The sheet body is made of a sheet-like material made of heat-resistant fibers and a water-impermeable coating material formed on both sides of the material, and the coating material contains silicone, so that the silicone of the sheet body does not stick to the top plate of the induction cooker during use. This configuration provides the effect of providing a predetermined tear strength. 7 is obtained. Claim 8The invention described is a stain prevention mat for an induction cooker that is sandwiched between the top plate of the induction cooker and the bottom of a pot heated by the induction cooker. The mat is made of a heat-resistant sheet that is permeable to magnetic lines, and the maximum tear strength of the sheet is 5.0 kN / m or more. 200.5 The sheet body has a thickness of 0.74 mm or less, and the sheet body is made of a sheet-like material made of heat-resistant fibers and a coating material having water impermeability that is formed on both sides of the material, the material containing glass fiber, the coating material containing silicone, and the material having a thickness of 0.04 The thickness is between 0.42 mm and 0.52 mm. This configuration provides the effect of providing a predetermined tear strength. 8 is obtained. Claim 9 The invention described is a stain prevention mat for an induction cooker that is sandwiched between the top plate of the induction cooker and the bottom of a pot heated by the induction cooker. The mat is made of a heat-resistant sheet that is permeable to magnetic lines, and the maximum tear strength of the sheet is 5.0 kN / m or more. 200.5 The sheet body is made of a sheet-like material made of heat-resistant fibers and a coating material having water impermeability formed on both sides of the material, the material containing glass fibers, the coating material containing silicone, the thickness of the sheet body is 0.74 mm or less, and the material has a thickness of 0.04 The coating material is between 0.42 mm and 0.42 mm. On the surface In this case, the coating thickness (thickness after drying) 2.9 μm or more 28.6 μm or less The coating thickness (thickness after drying) on ​​the back side of the coating material is 8.6 μm or more and 297.6 μm or less. It is something. This configuration provides the effect of providing a predetermined tear strength. 9 is obtained. [Effects of the Invention]

[0031] As described above, the invention of claim 1 provides the above-mentioned effect 1, so that the stain prevention mat is less likely to stick or tear when peeled off from the top plate. Moreover, the mat has a predetermined strength and is excellent in heat resistance, impact resistance and flexibility.

[0032] The invention of claim 2 provides the effect of the invention of claim 1 as well as the above-mentioned effect 2, thereby reducing the risk of problems occurring when using an electromagnetic cooker.

[0033] The invention described in claim 3 achieves the above-mentioned effect 3 in addition to the effects of the invention described in claim 1 or claim 2, making it less likely to damage the top plate or pot, preventing sticking or tearing, and less likely to interfere with the proper operation of the temperature sensor.

[0034] The invention of claim 4 provides the effect of the invention of claim 3 as well as the effect 4 described above, and therefore does not interfere with the proper operation of the temperature sensor.

[0035] The invention described in claim 5 achieves the above-mentioned effect 5 in addition to the effects of the invention described in claim 1 or claim 2, making it less likely to damage the top plate or pot, preventing sticking or tearing, and less likely to interfere with the proper operation of the temperature sensor.

[0036] The invention of claim 6 provides the effect of the invention of claim 5 as well as the above-mentioned function 6, and therefore does not interfere with the proper operation of the temperature sensor.

[0040] request request 7 The invention described above has the above action. 7 Therefore, the stain prevention mat is less likely to stick or tear when peeled off from the top plate. Claim 8 The invention described above has the above action. 8 Therefore, the stain prevention mat is less likely to stick or tear when peeled off from the top plate. Claim 9 The invention described above has the above action. 9 Therefore, the stain prevention mat is less likely to stick or tear when peeled off from the top plate. [Brief explanation of the drawings]

[0041] [Figure 1]1 is an enlarged perspective view showing the general shape of a stain prevention mat for an induction cooker according to a first embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged cross-sectional view taken along the line II-II shown in FIG. [Figure 3] 1 is a plan view showing the external appearance of a conventional stain-preventing mat for an electromagnetic cooker when used in a general cooking heating device incorporating an electromagnetic cooker. [Figure 4] 4 is a diagram corresponding to the line IV-IV shown in FIG. 3, and is a cross-sectional view schematically showing the operating principle of an induction cooker and an enlarged cross-sectional view of a conventional stain-preventing mat for an induction cooker. DETAILED DESCRIPTION OF THE INVENTION

[0042] FIG. 1 is an enlarged perspective view showing the schematic shape of a stain-preventing mat for an induction cooker according to a first embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view taken along the line II-II shown in FIG.

[0043] Referring to these figures, the stain-preventing mat 1 is for use with an induction cooktop, sandwiched between the top plate of the cooktop and the bottom of a pot heated by the induction cooktop. It is comprised of a circular cutout of a heat-resistant sheet 2 that is permeable to magnetic lines. The sheet 2 comprises a sheet-like woven fabric 3 made of a plain-woven glass fiber that is permeable to magnetic lines and heat-resistant, and has a maximum tear strength of 5.0 kN / m to 240 kN / m. Coating materials 4a and 4b are formed on both sides of the woven fabric 3 and are made of water-impermeable, heat-resistant silicone. In this specification, "silicone" refers to silicone resin, silicone rubber, or both. This configuration provides a predetermined tear strength, making the stain-preventing mat 1 less likely to stick or tear when peeled from the top plate. Furthermore, a maximum tear strength of 15.0 kN / m or more is more preferable, since it reduces even slight adhesion of the stain-preventing mat 1. From the standpoint of adhesion, there is no particular upper limit to the maximum tear strength of the sheet body 2. However, the tear strength of the sheet body 2 varies depending on the thickness and fiber density of the glass fiber-containing woven fabric 3 that constitutes the sheet body 2, which affect the response of the temperature sensor that detects the temperature of the top plate. Therefore, setting the tear strength of the sheet body 2 to 240 kN / m or less, more preferably 210 kN / m or less, reduces the impact on the response of the temperature sensor. Furthermore, if the tear strength of the sheet body 2 is too high, it may be difficult to handle and process the sheet body 2 during the manufacture of the stain-preventing mat 1. Furthermore, having a tear strength higher than necessary is undesirable because it may waste resources and be environmentally friendly. The outer peripheral edge of the sheet body 2 may be bordered around the entire periphery with bias tape or the like that creates a U-shaped cross section.

[0044] When the sheet-like material is a woven fabric 3 formed by weaving glass fibers, the stain-preventing mat 1 has a predetermined heat resistance and strength while also being flexible, resulting in a stain-preventing mat 1 with a predetermined strength and excellent heat resistance, impact resistance, and flexibility. Furthermore, since commonly available, general-purpose glass fibers can be used, manufacturing costs can also be reduced. Furthermore, when the coating materials 4a and 4b are made of silicone, the surface of the stain-preventing mat 1 has anti-slip properties, heat resistance, and water impermeability, resulting in a stain-preventing mat 1 that is easy to use.

[0045] To explain in more detail the structure and effects of the stain-prevention mat 1, the stain-prevention mat 1 has cushioning properties because it uses woven fabric 3 as its core material. In addition, the water-impermeable coating materials 4a and 4b fill the weave of the woven fabric 3, preventing dirt from reaching the interior of the woven fabric 3, so the entire stain-prevention mat 1 is water-impermeable.

[0046] When the thus constructed stain-prevention mat 1 is placed on the top plate 17 of the induction cooker 13a or 13b in place of the stain-prevention mat 51 shown in Figures 3 and 4 and a pot 19 is placed on top of it, the stain-prevention mat 1 prevents dirt adhering to the bottom of the pot 19 and food splashes from adhering directly to the top plate 17, just like the stain-prevention mat 51.

[0047] Furthermore, the stain-prevention mat 1 is easy to handle because its cushioning properties prevent it from damaging the top plate 17 or pot 19 during use, and there is no risk of the stain-prevention mat 1 itself breaking. Furthermore, the woven fabric 3 made of glass fiber is a material that not only provides cushioning but also has excellent heat and impact resistance, further improving reliability during use. Furthermore, because it is an inexpensive material, the stain-prevention mat 1 is cost-effective (economical).

[0048] Furthermore, since the coating materials 4a and 4b are heat resistant, there is no danger of them melting during cooking, and they exhibit anti-slip properties on the bottom surface of the pot 19 and the top plate 17, making them even easier to use. Furthermore, since the coating materials 4a and 4b are water repellent, not only is there no risk of liquid dirt penetrating into the woven fabric 3, but they can also be easily washed with water, making it possible to use the stain-prevention mat 1 in a more hygienic manner.

[0049] The thickness of the sheet body 2 is preferably 0.74 mm or less. This configuration reduces the effect on the temperature sensor 18 that detects the temperature of the top plate 17, thereby reducing the risk of malfunctions occurring when using the induction cooker 13a or 13b.

[0050] The woven fabric 3, which is a sheet-like material, has a thickness of 0.02 mm or more and 0.42 mm or less, and the coating amount (weight after drying) of each of the surface coating material 4a and the back coating material 4b is 5 g / m 2 More than 520g / m 2 Preferably, it is 10 g / m or less. 2 More preferably, it is 20 g / m or more. 2 More than 150g / m 2 With this configuration, the mat 1 has both cushioning properties and a predetermined tear strength, and has less effect on the temperature sensor 18 that detects the temperature of the top plate 17, making it less likely to damage the top plate 17 or the pot 19, preventing the mat 1 from sticking or tearing, and less likely to interfere with the proper operation of the temperature sensor 18. 2 In the following cases, waste of the coating materials 4a and 4b can be avoided, resulting in a stain-preventing mat 1 that is cost- and resource-saving.

[0051] Furthermore, the sheet body 2 has a total coating amount (weight after drying) of the coating materials 4a and 4b of 20 g / m 2 More than 570g / m 2 Preferably, it is 30 g / m or less. 2 More than 300g / m 2It is more preferable that the temperature sensor 18 for detecting the temperature of the top plate 17 is not affected by the temperature sensor 18. This configuration further reduces the influence on the temperature sensor 18 for detecting the temperature of the top plate 17, and does not hinder the proper operation of the temperature sensor 18.

[0052] Furthermore, the coating thickness (thickness after drying) of the coating material on each of the front and back surfaces is preferably 2 μm to 300 μm, and more preferably 10 μm to 90 μm. This configuration provides both cushioning properties and a predetermined tear strength, while minimizing the impact on the temperature sensor 18 that detects the temperature of the top plate 17. This reduces the risk of damage to the top plate 17 or the pot 19, prevents adhesion or tearing of the stain-prevention mat 1, and is less likely to interfere with the proper operation of the temperature sensor 18. Furthermore, since waste of the coating materials 4a and 4b is reduced, the stain-prevention mat 1 is cost- and resource-efficient.

[0053] Furthermore, the total coating thickness (thickness after drying) of the coating material on the sheet body is preferably 4 μm or more and 330 μm or less, more preferably 10 μm or more, and even more preferably 15 μm or more and 180 μm or less. This configuration further reduces the effect on temperature sensor 18 that detects the temperature of top plate 17, so that proper operation of temperature sensor 18 is not hindered.

[0054] In the first embodiment, the stain-preventing mat is made of a woven fabric and a coating material formed on both sides of the woven fabric, but it may be made of silicone only.

[0055] In the first embodiment, the sheet-like material is a plain-woven glass fiber fabric, but it may also contain glass fiber in part, or may be made of other fibers or materials that are permeable to magnetic lines of force and heat-resistant. For example, it may be a nonwoven fabric made of glass fiber, a woven or nonwoven fabric made of carbon fiber or ceramic fiber, or paper.

[0056] Furthermore, in the first embodiment, the coating material is formed on the entire surface of both sides of the woven fabric, but it may be formed only on a part of the surface, or on only one side, or may not be formed at all.

[0057] Furthermore, in the first embodiment, the coating material is made of silicone, but it may contain silicone in part, or may be made of other non-permeable materials. It is preferable that the coating material be permeable to magnetic lines of force, but even if it is non-permeable above a certain thickness, it can be used as long as it can maintain permeability when the thickness is less than the certain thickness.

[0058] Furthermore, although the stain-preventing mat in the first embodiment is circular, it may be other shapes, such as rectangular or donut-shaped. When an opening is formed in the center, such as in a donut shape, it can also be used as a stain-preventing mat for a gas stove by placing it under the trivet of a gas stove other than an induction cooker. Therefore, in the present invention, even if it can be used as a stain-preventing mat for a gas stove, it is considered to be within the scope of the present invention as long as it can also be used as a stain-preventing mat for an induction cooker.

[0059] Furthermore, in the first embodiment described above, it was preferable that the thickness of the sheet body, the thickness of the sheet-like material, the coating amount on each of the front and back sides of the coating material, and the total coating amount on the front and back sides be set within specific ranges, but they may be set outside the specific ranges as long as the maximum tear strength of the sheet body is 5.0 kN / m or more and 240 kN / m or less. [Example]

[0060] Experiments were conducted to evaluate the degree of influence of the tear strength of the stain prevention mat on the sticking phenomenon and the degree of influence of the thickness of the sheet body on the temperature sensor.

[0061] For the experiment, stain-prevention mat samples were prepared in which the type of glass fiber, the amount of coating material (silicone) on the front and back surfaces (weight after drying), tear strength, sheet thickness, and coating thickness of the coating material (silicone) on the front and back surfaces were changed as shown in Table 1. Table 1 also shows the results of the experiment (Evaluation 1 and Evaluation 2), details of which will be described later. The information on each glass fiber shown in Table 1 is as shown in Table 2 below.

[0062] [Table 1]

[0063] [Table 2] The tear strength in Table 1 was measured using a test method conforming to JIS K6252:2015 (trouser type) constant-rate extension test, with a tensile speed of 10 cm / min. The tear strength indicated is the maximum value (maximum strength). The sheet thickness was measured using a dial thickness gauge at three locations near the tear point of the test specimen, as specified in JIS K6250-10 (Dimensional Measurement Method). The thickness of the coating material on the front and back surfaces (coating thickness) was measured by embedding the sheet in epoxy resin so that the cross section of the sheet was the observation surface, polishing the surface, and observing the polished surface with a scanning electron microscope (SEM). The thickness of the coating material on the front and back surfaces of the sheet was measured at 10 locations at 200 μm intervals in the direction perpendicular to the thickness of the coating material (i.e., the direction parallel to the woven glass fiber fabric used as the sheet material). The arithmetic mean of the thickness values ​​was calculated. The name of the scanning electron microscope used for observing the cross section of the sheet body with the scanning electron microscope and the measurement conditions are as follows: As a pretreatment for the observation with the scanning electron microscope, the sheet body to be observed was embedded in epoxy resin, mechanically polished, and then carbon vapor deposited. Device name: Hitachi High-Technologies Corporation scanning electron microscope (model number: S-3700N), measurement conditions: measurement magnification 150x, acceleration voltage 5 kV, vacuum degree 10 Pa, backscattered electron image acquisition In addition, these images obtained by the scanning electron microscope were analyzed using image analysis software (WinRoof2018 manufactured by Mitani Corporation) under the condition of measuring the distance between two points.

[0064] To further explain the tear strength measurement, first, each sample was prepared into a trouser-shaped test specimen (each rectangular sample had a slit cut from the center of one short edge parallel to the longitudinal direction). Next, for each test specimen, the maximum tear force (maximum strength) was measured, starting from the slit and with the tear direction at a 45° angle to the crease in the glass fiber. Note that the tear strength in JIS K6252:2015 (trouser-shaped) is defined as the median tear force, determined according to JIS K6274, starting from the slit and divided by the thickness of the test specimen. However, in the above samples, which primarily consist of glass fiber, the glass fiber would break apart when tearing began, causing a rapid drop in the measured value, resulting in inaccurate measurement results. Therefore, in this experiment, the tear strength value was determined by dividing the maximum force required to tear (maximum strength) by the thickness of the test piece, rather than the median force required to tear.

[0065] Next, the influence of each sample on the adhesion phenomenon (Evaluation 1) was evaluated. (1) Specifications of the equipment used in the measurement of Evaluation 1 Muffle furnace: electric furnace (Yamato Scientific Co., Ltd.: FO510) Crystallized glass: Ultra heat-resistant crystallized glass: 3 mm thick (Nippon Electric Glass Co., Ltd.: Neoceram N-0) (2) Measurement content for evaluation 1 First, a specimen of each sample was placed on the crystallized glass and heated in a muffle furnace at 300°C for 16 hours. After heating, the specimen was cooled to room temperature and then peeled off from the crystallized glass. When peeling off, the specimen was evaluated as ◎ if it peeled off cleanly, ◯ if some silicone from the specimen remained on the crystallized glass but could be easily removed by rubbing with the fingers, and × if silicone and glass fibers from the specimen remained on the crystallized glass (including cases where the specimen was torn). (3) Measurement results for evaluation 1 The measurement results for Evaluation 1 revealed the following:

[0066] First, in Examples 1 to 3, the specimens peeled cleanly in Examples 1 and 2, whereas in Example 3, which had the lowest tear strength, some of the silicone in the specimen remained on the crystallized glass, although it was easily removable. Furthermore, in Comparative Example 1, which had the same glass fibers in the woven fabric and the same amount of coating material on the front surface as in Example 3, but had a lower amount of coating material on the back surface than in Example 3 and thus lower tear strength, the silicone and glass fibers in the specimen remained on the crystallized glass, resulting in tearing of the specimen. Furthermore, in Example 4 and Comparative Example 2, which had higher tear strength than Examples 1 to 3, the specimens peeled cleanly. Therefore, it can be said that the presence and degree of adhesion phenomenon depend on the tear strength of the sheet body.

[0067] Specifically, if the maximum tear strength of the sheet body is 5.0 kN / m or more, it has the specified tear strength, and the stain-prevention mat is less likely to stick or tear when peeled off from the top plate.

[0068] In addition, for a sheet body with a maximum tear strength of 5.0 kN / m or more, in order for the stain prevention mat to have both cushioning properties and a predetermined tear strength, the woven fabric material must be 0.02 mm thick or more, and the coating material must have a coating amount of 5 g / m on each of the front and back surfaces. 2 or more, and the total coating amount is 20 g / m 2 It is preferable that this is equal to or greater than this.

[0069] Among the samples, the sample with the largest sheet thickness (Comparative Example 2) had the highest tear strength. However, increasing the sheet thickness increases the insulating effect of the stain-prevention mat. If the insulating effect of the sheet is too high, it becomes difficult for the temperature of the pot to be transmitted to the temperature sensor. Therefore, even if a stain-prevention mat has high tear strength and is less likely to stick, it is unsuitable for use if its insulating effect is too high and it interferes with the proper operation of the temperature sensor.

[0070] Therefore, the influence of each sample on an induction cooker under the conditions of use (evaluation 2) was measured. (4) Specifications of the equipment used in the measurements for Evaluation 2 Induction cooker: Cooking heater (Mitsubishi Electric: CS-G3205BDS) Pot: Dedicated tempura pot: 22cm diameter (manufactured by Urushiyama Metal Industry: CS-100667) Oil: Nissin salad oil (Nissin Oillio Group) Oil temperature measuring device: Infrared radiation thermometer (manufactured by Sato Keiki: SK-8700II) (5) Measurement content for evaluation 2 Each sample was placed between the pan and the top plate, and 200cc of salad oil was added to the pan and heated using the "deep-frying function." The "deep-frying function" refers to the function in which the temperature sensor detects the heat from the heated pan via the top plate, and adjusts the amount of heat based on this detected temperature to maintain the oil temperature at approximately 200°C.

[0071] Furthermore, the safe oil volume for the induction cooker used is 500cc or more, so the 200cc of oil used in this case was not an appropriate amount.

[0072] If the oil temperature did not exceed 300°C and the induction cooker automatically finished preheating (stopped heating), it was evaluated as ◯, and if it exceeded 300°C, it was evaluated as ×. (6) Measurement results for evaluation 2 The measurement results for Evaluation 2 revealed the following:

[0073] In Examples 1 to 4 and Comparative Example 1, the induction cooker automatically stopped heating before the oil temperature exceeded 300°C. In Comparative Example 2, which had the largest values ​​for sheet thickness and coating thickness, the induction cooker did not automatically stop heating and the oil temperature exceeded 300°C. This means that Comparative Example 2 does not provide temperature control for the deep-frying function, posing a safety risk. Therefore, it can be said that the thickness of the sheet and the coating thickness of the coating affect the proper operation of the temperature sensor on the induction cooker. The thickness of the sheet is determined by the thickness of the woven fabric (sheet-like material), the coating amount and coating thickness on the front and back of the coating material, and the total coating amount and total coating thickness on both sides, and therefore these factors also affect the proper operation of the temperature sensor.

[0074] Specifically, if the thickness of the sheet body is 0.74 mm or less, the influence on the temperature sensor that detects the temperature of the top plate is reduced, and therefore the risk of problems occurring when using an induction cooker is reduced.

[0075] Furthermore, if the total coating thickness of the coating material on the front and back surfaces is 326.2 μm or less, the effect on the temperature sensor that detects the temperature of the top plate is further reduced, so that the temperature sensor does not interfere with proper operation.

[0076] In order to minimize the influence on the temperature sensor while maintaining a predetermined tear strength, it is preferable that the maximum tear strength of the sheet body having a thickness of 0.74 mm or less is 5.0 kN / m or more and 240 kN / m or less. Also, it is preferable that the thickness of the woven fabric, which is the material, is 0.42 mm or less, and the coating amount of the coating material is 520 g / m on each of the front and back surfaces. 2 If the total coating weight of the coating material is 570 g / m or less, it is more preferable because it combines cushioning properties with a predetermined tear strength and reduces the influence on the temperature sensor that detects the temperature of the top plate. 2 If the temperature is less than this, the influence on the temperature sensor that detects the temperature of the top plate is further reduced, which is more preferable.

[0077] From the above, it can be said that the tear strength of a stain-prevention mat has a significant impact on the adhesion phenomenon of the stain-prevention mat, while the thickness of the stain-prevention mat sheet, the thickness of the sheet material, the amount and thickness of coating on the front and back of the coating material, and the total amount and thickness of coating on both sides are factors that have a significant impact on the operating condition of an induction cooker, and only when these factors are appropriately selected can the existence of a stain-prevention mat be meaningful.

[0078] That is, in the stain prevention mat, the maximum tear strength of the sheet body is preferably 5.0 kN / m or more and 240 kN / m or less, and in addition, the thickness of the sheet body is 0.74 mm or less, the thickness of the sheet-like material of the sheet body is 0.02 mm or more and 0.42 mm or less, and the coating material has a coating amount of 5 g / m on each of the front and back surfaces. 2 More than 520g / m 2 or less, and the total coating amount is 20 g / m 2 More than 570g / m 2 It is more preferable that the coating thickness on each of the front and back surfaces is 2 μm to 300 μm, and the total coating thickness is 4 μm to 330 μm. If the maximum tear strength of the sheet body is 15.0 kN / m or more, the sticking phenomenon itself is less likely to occur, resulting in a more preferable stain-preventing mat. [Explanation of symbols]

[0079] 1. Dirt prevention mat 2...Sheet body 3…Woven fabric 4a, 4b...coating material 13a,13b…Induction cooker 17...Top plate 19...Hot pot In addition, the same reference numerals in each drawing indicate the same or corresponding parts.

Claims

1. A stain-preventing mat for an induction cooker is used by being sandwiched between the top plate of the induction cooker and the bottom surface of a pot heated by the induction cooker. It is made of a heat-resistant sheet body that is permeable to magnetic lines of force, The sheet body has a maximum tear strength of 5.0 kN / m or more and 200.5 kN / m or less, The sheet body is a stain-preventing mat for an induction cooker, which is made of glass fiber and silicone formed on both sides of the glass fiber.

2. 2. The stain-preventing mat for an induction cooker according to claim 1, wherein the thickness of the sheet body is 0.74 mm or less.

3. The sheet body is a sheet-like material made of heat-resistant fibers; and a coating material formed on both sides of the material and having water impermeability. The material has a thickness of 0.04 mm or more and 0.42 mm or less, The coating material has a coating amount of 5 g / m on the surface. ２ 50g / m or more ２ is as follows:

3. The stain-preventing mat for an induction cooker according to claim 1, wherein the coating material has a coating weight of 15 g / m<2 > or more and 520 g / m<2 > or less on the back surface.

4. The sheet body is The total coating amount of the coating material is 20 g / m ２ More than 570g / m ２ 4. The stain-preventing mat for an electromagnetic cooker according to claim 3, wherein:

5. The sheet body is a sheet-like material made of heat-resistant fibers; and a coating material formed on both sides of the material and having water impermeability. The material has a thickness of 0.04 mm or more and 0.42 mm or less, The coating material has a coating thickness of 2.9 μm or more and 28.6 μm or less on the surface, 3. The stain-preventing mat for an induction cooker according to claim 1, wherein the coating material has a coating thickness of 8.6 μm or more and 297.6 μm or less on the back surface.

6. The sheet body is 6. The stain-preventing mat for an induction cooker according to claim 5, wherein the total coating thickness of the coating material is 11.5 μm or more and 326.2 μm or less.

7. A stain-preventing mat for an induction cooker is sandwiched between the top plate of the induction cooker and the bottom surface of a pot heated by the induction cooker, It is made of a heat-resistant sheet body that is permeable to magnetic lines of force, The sheet body has a maximum tear strength of 15.0 kN / m or more and 200.5 kN / m or less, The sheet body includes a sheet-like material made of heat-resistant fibers, and a coating material formed on both sides of the material and having water impermeability. the coating material contains silicone, This stain-preventing mat for an electromagnetic cooker prevents the silicone of the sheet body from remaining on the top plate of the electromagnetic cooker during use, resulting in no sticking phenomenon.

8. A stain-preventing mat for an induction cooker is sandwiched between the top plate of the induction cooker and the bottom surface of a pot heated by the induction cooker, It is made of a heat-resistant sheet body that is permeable to magnetic lines of force, The sheet body has a maximum tear strength of 5.0 kN / m or more and 200.5 N / m or less, The thickness of the sheet body is 0.74 mm or less, The sheet body includes a sheet-like material made of heat-resistant fibers, and a coating material formed on both sides of the material and having water impermeability. The material includes glass fiber, the coating material contains silicone, The material has a thickness of 0.04 mm or more and 0.42 mm or less.

9. A stain-preventing mat for an induction cooker is sandwiched between the top plate of the induction cooker and the bottom surface of a pot heated by the induction cooker, It is made of a heat-resistant sheet body that is permeable to magnetic lines of force, The sheet body has a maximum tear strength of 5.0 kN / m or more and 200.5 kN / m or less, The sheet body includes a sheet-like material made of heat-resistant fibers, and a coating material formed on both sides of the material and having water impermeability. The material includes glass fiber, the coating material contains silicone, The thickness of the sheet body is 0.74 mm or less, The material has a thickness of 0.04 mm or more and 0.42 mm or less, The coating material has a coating thickness (thickness after drying) of 2.9 μm or more and 28.6 μm or less on the surface, The stain-preventing mat for an induction cooker, wherein the coating material has a coating thickness (thickness after drying) on ​​the back surface of 8.6 μm or more and 297.6 μm or less.

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