HK40097686A - Antifouling pad for electromagnetic cooker - Google Patents

Description

Anti-fouling mat for electromagnetic cookers

Technical Field

This invention relates to a stain-resistant mat for electromagnetic cookers, and more particularly to a stain-resistant mat for electromagnetic cookers that prevents dirt or spills (splashes/sprays) from adhering to the top plate of the cooker.

Background Technology

As an anti-fouling pad for electromagnetic cookers, used as a clamp between the top plate and the bottom of the pot, there exists a device as shown in Patent Document 1.

Figure 3 is a top view showing the appearance of a conventional anti-fouling pad for an electromagnetic cooker in a general cooking heating device equipped with an electromagnetic cooker. Figure 4 is a cross-sectional view corresponding to line IV-IV shown in Figure 3, schematically showing the working principle of an electromagnetic cooker and an enlarged cross-sectional view of a conventional anti-fouling pad for an electromagnetic cooker.

First, referring to Figure 3, electromagnetic cookers 13a and 13b are arranged on the left and right sides in front of the top plate 17 of the cooking heating device 61, and a heating wire heater 63 with a nickel-chromium alloy wire assembled to the bottom of the top plate 17 is arranged behind the top plate 17. It should be noted that the cooking heating device 61 may also have cases where electromagnetic cookers are used instead of heating wire heaters 63 (i.e., three electromagnetic cookers are provided), or cases where only two electromagnetic cookers are provided without heating wire heaters 63. Additionally, an intake/exhaust panel 65 is arranged on the inner side of the top plate 17. In this figure, a magnetically permeable and heat-resistant anti-fouling pad 51 is shown for the electromagnetic cooker 13b, and the pot 19 to be heated is placed on it.

Referring to Figure 4(1), a magnetic generating coil 14 constituting the electromagnetic cooker 13b is arranged below the top plate 17. When a switch (not shown) is turned on and current flows through the magnetic generating coil 14, magnetic lines of force 15, indicated by double-dotted lines, are generated around the magnetic generating coil 14. These magnetic lines of force 15 penetrate the top plate 17 and the anti-fouling pad 51, and further penetrate the bottom of the pot 19 placed on the top plate 17, forming a ring. The pot 19 is made of a material with a specified conductivity, so as the magnetic lines of force 15 are generated, eddy currents 16 are generated on the bottom of the pot. The eddy currents 16 generated in this way replace heat through the resistance of the bottom of the pot 19, and the temperature of the bottom of the pot rises. Thus, the food contained in the pot 19 is heated without fire. To explain, if the energization of the magnetic generating coil 14 is stopped, the magnetic lines of force 15 disappear, and thus the eddy currents 16 generated on the bottom of the pot 19 also disappear. As a result, the temperature of the bottom of the pot 19 drops, and the heating process ends. A temperature sensor 18 is installed below the top plate 17. The temperature sensor 18 monitors the temperature of the top plate 17, and when the temperature of the top plate 17 rises abnormally due to dry burning or other reasons, the power supply is cut off by a control device (not shown) to stop heating.

Regarding the structure of the antifouling pad 51, referring to Figure 4(2) and Figure 3, which enlarge the antifouling pad 51 of the “Z” portion of Figure 4(1), the antifouling pad 51 is made by cutting a circular piece of fabric 53, which is made of glass fiber with magnetic field permeability, into a sheet 52 by applying non-permeable and heat-resistant silicone 54a and 54b to the entire surface of both sides. Because the antifouling pad 51 uses fabric 53 as its core material, it has cushioning properties. Furthermore, because non-permeable and heat-resistant silicone 54a and 54b are applied to both sides, the antifouling pad 51 is both non-permeable and heat-resistant overall.

The anti-fouling pad 51 prevents dirt or food splatter from adhering directly to the top plate 17 on the bottom surface of the pot 19, maintaining an aesthetically pleasing appearance and eliminating the need for cleaning. Furthermore, by setting the thermal resistance of the pad 52 within a specified range, its use is prevented from affecting the temperature sensor of the electromagnetic cooker, thus reducing the impact on the temperature sensor that detects the temperature of the top plate. As a result, the possibility of malfunctions when using the electromagnetic cooker is reduced.

Previous technical documents

Patent documents

Patent Document 1: Japanese Patent Application Publication No. 2009-140887

When the conventional anti-fouling pad 51 as described in Patent Document 1 is placed on an electromagnetic cooker 13a or 13b, and the cooker 19 is used to heat the anti-fouling pad 51 by cooking, the anti-fouling pad 51 is in contact with the electromagnetic cooker 13a or 13b at high temperature. The silicone 54a and 54b of the anti-fouling pad 51 have a chemical structure similar to that of glass, which is the material of the top plate 17. Therefore, sometimes the silicone 54a or 54b located on the side of the top plate 17 adheres to the top plate 17, leaving silicone 54a or 54b residue on the top plate 17. If the adhesion is slight, the adhered silicone 54a or 54b can be easily removed by wiping the adhered part with a finger or a sponge containing detergent, but if the adhesion is strong, the anti-fouling pad 51 itself becomes attached to the top plate 17, so sometimes it cannot be removed from the top plate 17, and it may become dirt itself on the top plate 17. Furthermore, even if the adhesive is strong, if the anti-fouling pad 51 is to be peeled off from the top plate 17, the anti-fouling pad 51 may be damaged by tearing from the adhesive portion. That is, not only the silicone 54a or 54b constituting the anti-fouling pad 51, but also the glass fiber may remain on the top plate 17.

The present invention was made to solve the aforementioned problems, and its purpose is to provide an anti-fouling mat for electromagnetic cookers that is less prone to sticking and breakage.

Summary of the Invention

To achieve the above objectives, the first aspect of the present invention provides an anti-fouling pad for an electromagnetic cooker, which is used to sandwich between the top plate of an electromagnetic cooker and the bottom surface of a pot heated by the electromagnetic cooker. The pad includes a heat-resistant sheet with magnetic field permeability, and the maximum tear strength of the sheet is 5.0 kN/m or more and 240 kN/m or less.

If constructed in this way, it can achieve the specified tear strength.

The anti-fouling pad for an electromagnetic cooker according to the second aspect of the present invention is configured such that the thickness of the sheet is 0.74 mm or less in the first aspect of the invention.

If configured in this way, the influence of the temperature sensor that detects the temperature of the top plate can be reduced.

The anti-fouling pad for an electromagnetic cooker according to the third aspect of the present invention is constructed in the first or second aspect of the invention. The sheet body includes a sheet-like material made of heat-resistant fibers and a non-permeable coating material formed on both sides of the material. The thickness of the material is 0.02 mm or more and 0.42 mm or less, and the coating amount of the coating material on each side, the front and back, is 5 g/ ^m² or more and 520 g/ ^m² or less.

This configuration achieves both cushioning and specified tear strength, while minimizing the impact on the temperature sensor detecting the top plate temperature.

The anti-fouling pad for an electromagnetic cooker according to the fourth aspect of the present invention is configured such that the total amount of coating material on the sheet is 20 g/ ^m² or more and 570 g/ ^m² or less, according to the third aspect of the invention.

If configured in this way, the influence of the temperature sensor that detects the temperature of the top plate can be further reduced.

The fifth aspect of the present invention is an anti-fouling pad for an electromagnetic cooker, which is constructed in the first or second aspect of the invention and includes a sheet material made of heat-resistant fibers and a non-permeable coating material formed on both sides of the material. The thickness of the material is 0.02 mm or more and 0.42 mm or less, and the coating thickness of the coating material on each side, the surface and the back side, is 2 μm or more and 300 μm or less.

This configuration achieves both cushioning and specified tear strength, while minimizing the impact on the temperature sensor detecting the top plate temperature.

The anti-fouling pad for an electromagnetic cooker according to the sixth aspect of the present invention is configured in the fifth aspect of the invention, wherein the total coating thickness of the coating material on the sheet is 4 μm or more and 330 μm or less.

If configured in this way, the influence of the temperature sensor that detects the temperature of the top plate can be further reduced.

The anti-fouling mat for an electromagnetic cooker according to the seventh aspect of the present invention is constructed in the third aspect of the invention, and the material comprises glass fiber.

If constructed in this way, the antifouling pad can have the specified heat resistance and strength, as well as the function of being soft.

The anti-fouling mat for an electromagnetic cooker according to the eighth aspect of the present invention is constructed in the fifth aspect of the invention, and the material comprises glass fiber.

If constructed in this way, the anti-fouling pad can have the specified heat resistance and strength, as well as the function of being soft.

The anti-fouling pad for an electromagnetic cooker according to the ninth aspect of the present invention is constructed in the third aspect of the invention, wherein the coating material comprises silicone.

If constructed in this way, the surface of the anti-fouling mat can have the functions of anti-slip, heat resistance, and water impermeability.

The anti-fouling pad for an electromagnetic cooker according to the tenth aspect of the present invention is constructed in the fifth aspect of the invention, wherein the coating material comprises silicone.

If constructed in this way, the surface of the anti-fouling mat can have the functions of anti-slip, heat resistance, and water impermeability.

As described above, the anti-fouling pad for an electromagnetic cooker of the first aspect of the present invention can achieve the above-mentioned effect 1, so that when the anti-fouling pad is peeled off from the top plate, it is not easy to cause adhesion (fixation) and damage.

In addition to the effects of the invention in the first aspect, the anti-fouling pad for an electromagnetic cooker according to the second aspect of the present invention can also achieve the above-mentioned effect 2, thus reducing the possibility of adverse situations occurring when using an electromagnetic cooker.

In addition to the effects of the invention in the first or second aspect, the anti-fouling pad for the electromagnetic cooker of the third aspect of the present invention can also achieve the above-mentioned effect 3, thus it is less likely to damage the top plate and the pot, and prevents sticking and breakage, and is less likely to interfere with the proper operation of the temperature sensor.

In addition to the effects of the invention in the third aspect, the anti-fouling pad for an electromagnetic cooker of the fourth aspect of the present invention can also achieve the above-mentioned effect 4, thus not hindering the proper operation of the temperature sensor.

In addition to the effects of the invention in the first or second aspect, the anti-fouling pad for the electromagnetic cooker of the fifth aspect of the present invention can also achieve the above-mentioned effect 5, thus it is less likely to damage the top plate and the pot, and prevents sticking and breakage, and is less likely to interfere with the proper operation of the temperature sensor.

In addition to the effects of the invention in aspect 5, the anti-fouling pad for an electromagnetic cooker according to aspect 6 of the present invention can also achieve the above-mentioned effect 6, thus not hindering the proper operation of the temperature sensor.

In addition to the effects of the invention in the third aspect, the anti-fouling mat for an electromagnetic cooker of the seventh aspect of the present invention can also achieve the above-mentioned effect 7, thus becoming an anti-fouling mat with specified strength and excellent heat resistance, impact resistance and softness.

In addition to the effects of the invention in aspect 5, the anti-fouling mat for an electromagnetic cooker of aspect 8 of the present invention can also achieve the above-mentioned effects 8, thus becoming an anti-fouling mat with specified strength and excellent heat resistance, impact resistance and softness.

In addition to the effects of the invention in the third aspect, the anti-fouling mat for an electromagnetic cooker of the ninth aspect of the present invention can also achieve the above-mentioned effect 9, thus becoming an anti-fouling mat with good ease of use.

In addition to the effects of the invention in aspect 5, the anti-fouling mat for an electromagnetic cooker of aspect 10 of the present invention can also achieve the above-mentioned effect 10, thus becoming an anti-fouling mat with good ease of use.

Attached Figure Description

[Figure 1] is an enlarged perspective view showing the schematic shape of the anti-fouling pad for an electromagnetic cooker according to the first embodiment of the present invention.

[Figure 2] is an enlarged cross-sectional view of the I I-I I line shown in Figure 1.

[Figure 3] is a top view showing the appearance of a conventional anti-fouling pad for electromagnetic cookers in a general cooking heating device equipped with an electromagnetic cooker.

[Figure 4] is a cross-sectional view corresponding to line IV-IV shown in Figure 3, which schematically shows the working principle of an electromagnetic cooker and an enlarged cross-sectional view of a conventional anti-fouling pad for electromagnetic cookers.

Detailed Implementation

Figure 1 is an enlarged perspective view showing the general shape of the anti-fouling pad for an electromagnetic cooker according to the first embodiment of the present invention, and Figure 2 is an enlarged cross-sectional view along line I I-I I shown in Figure 1.

Referring to these figures, the anti-fouling pad 1 is an anti-fouling pad for an electromagnetic cooker, used to sandwich between the top plate of the electromagnetic cooker and the bottom surface of the pot heated by the electromagnetic cooker. It is made by cutting a heat-resistant sheet 2 with magnetic field permeability into a circle. The sheet 2 has a maximum tear strength of 5.0 kN/m or more and 240 kN/m or less, and comprises: a sheet-like material woven from a material that has magnetic field permeability and heat resistance, and coating materials 4a and 4b formed on both sides of the woven material 3, which are made of an organosilicon that is impermeable to water and heat-resistant. It should be noted that in this specification, organosilicon refers to organosilicon resin, silicone rubber, and organosilicon of both. With this structure, due to the specified tear strength, it is not easy for the anti-fouling pad 1 to stick and break when peeled from the top plate. It should be noted that as long as the maximum tear strength of the sheet 2 is 15.0 kN/m or higher, minor adhesion of the anti-fouling pad 1 is less likely to occur, which is more preferable. Furthermore, from the viewpoint of adhesion (fixation), there is no particular upper limit to the maximum tear strength of the sheet 2. The tear strength of the sheet 2 varies depending on the thickness and fiber density of the fabric 3 containing the glass fibers constituting the sheet 2, which affects the response of the temperature sensor detecting the temperature of the top plate. Therefore, if the tear strength of the sheet 2 is set to 240 kN/m or less, more preferably 210 kN/m or less, the influence on the response of the temperature sensor can be reduced. Additionally, if the tear strength of the sheet 2 is too high, the processability and workability of the sheet 2 during the manufacture of the anti-fouling pad 1 may sometimes deteriorate. Furthermore, since it may also waste resources from an environmental perspective, exceeding the necessary tear strength is not preferable. It should also be noted that the outer periphery of the sheet 2 can be edged with a bias band or the like with a U-shaped cross-section.

If the sheet material is woven into a fabric 3 of woven glass fiber, the anti-fouling mat 1 possesses the required heat resistance and strength, as well as flexibility, thus becoming an anti-fouling mat 1 with excellent heat resistance, impact resistance, and flexibility. Furthermore, since commonly available glass fiber can be used, manufacturing costs can be reduced. Moreover, if the coating materials 4a and 4b are made of silicone, the surface of the anti-fouling mat 1 possesses anti-slip properties, heat resistance, and water impermeability, thus becoming an anti-fouling mat 1 with good ease of use.

To further elaborate on the structure and function of the anti-fouling pad 1, since the anti-fouling pad 1 uses fabric 3 as its core material, it has cushioning properties. In addition, since the mesh of the fabric 3 is filled with non-permeable coating materials 4a and 4b, preventing dirt from reaching the interior of the fabric 3, the anti-fouling pad 1 as a whole is non-permeable.

When the anti-fouling pad 1 thus constructed is replaced with the anti-fouling pad 51 shown in Figures 3 and 4 and disposed on the top plate 17 of the electromagnetic cooker 13a or 13b, and a pot 19 is placed on it for use, the anti-fouling pad 1, like the anti-fouling pad 51, prevents dirt or food splatter from adhering to the bottom surface of the pot 19 from directly adhering to the top plate 17.

Furthermore, due to its inherent cushioning properties, the anti-fouling mat 1 will not damage the top plate 17 or the pot 19 during use, nor will it break, making it easy to handle. Additionally, the fiberglass fabric 3 not only provides excellent cushioning but also boasts superior heat resistance and impact resistance, further enhancing its reliability during use. Moreover, being an inexpensive material, the anti-fouling mat 1 offers excellent cost-effectiveness.

Furthermore, since the coating materials 4a and 4b are heat-resistant, there is no risk of melting during heating and cooking, and they provide anti-slip properties for the bottom surface and top plate 17 of the pot 19, thus further improving ease of use. Furthermore, since the coating materials 4a and 4b are waterproof, not only will liquid dirt not penetrate into the fabric 3, but it can also be easily washed, thus enabling more hygienic use of the stain-resistant mat 1.

It should be noted that the thickness of the sheet 2 is preferably 0.74 mm or less. With this configuration, the influence on the temperature sensor 18 that detects the temperature of the top plate 17 is reduced, thus reducing the possibility of malfunctions when using the electromagnetic cooker 13a or 13b.

Furthermore, the thickness of the fabric 3, which is a sheet material, is 0.02 mm or more and 0.42 mm or less. The coating amount (weight after drying) of the surface coating material 4a and the back coating material 4b is preferably 5 g/ ^m² or more and 520 g/ ^m² or less, more preferably 10 g/ ^m² or more, and even more preferably 20 g/ ^m² or more and 150 g/ ^m² or less. With this configuration, it has both cushioning and specified tear strength, and the influence on the temperature sensor 18 for detecting the temperature of the top plate 17 is reduced. Therefore, it is less likely to damage the top plate 17 and the pot 19, and it prevents the anti-fouling pad 1 from sticking and breaking, and it is less likely to hinder the proper operation of the temperature sensor 18. In particular, when the coating amount is 150 g/ ^m² or less, since the waste of coating materials 4a and 4b is eliminated, it becomes an anti-fouling pad 1 that saves costs and resources.

Furthermore, the total amount (by weight after drying) of coating materials 4a and 4b on the sheet 2 is preferably 20 g/ ^m² or more and 570 g/ ^m² or less, more preferably 30 g/ ^m² or more and 300 g/ ^m² or less. With this configuration, the influence on the temperature sensor 18, which detects the temperature of the top plate 17, is further reduced, thus not hindering the proper operation of the temperature sensor 18.

Furthermore, the coating thickness (after drying) of the coating material on each of the front and back sides is preferably 2 μm or more and 300 μm or less, more preferably 10 μm or more and 90 μm or less. This configuration provides both cushioning and the required tear strength, and reduces the impact on the temperature sensor 18 that detects the temperature of the top plate 17. Therefore, it is less likely to damage the top plate 17 and the pot 19, and it prevents the anti-fouling pad 1 from sticking and breaking, and it does not easily interfere with the proper operation of the temperature sensor 18. In addition, since the waste of coating materials 4a and 4b is eliminated, it becomes a cost-effective and resource-saving anti-fouling pad 1.

Furthermore, the total coating thickness (after drying) of the coating material on the sheet 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. With this configuration, the influence on the temperature sensor 18 that detects the temperature of the top plate 17 is further reduced, and therefore the proper operation of the temperature sensor 18 is not hindered.

To clarify, in the first embodiment described above, the antifouling pad is composed of woven fabric and a coating material formed on both sides of the woven fabric, but it may also be composed of only silicone.

Furthermore, in the first embodiment described above, the sheet-like material is a plain-woven fabric of glass fibers, but it can also be a material that contains glass fibers in a portion. Additionally, it can be made of other fibers or other materials that have magnetic field permeability and heat resistance. For example, it can also be a nonwoven fabric made of glass fibers, a woven or nonwoven fabric made of carbon fibers or ceramic fibers, or paper.

Furthermore, in the first embodiment described above, the coating material is formed on the entire surface of both sides of the fabric, but it may also be formed only on a portion of it. Alternatively, it may be formed only on one side, or it may not be formed on any side.

Furthermore, in the first embodiment described above, the coating material is made of silicone, but it may also contain silicone in a portion, or it may be made of other components that are non-permeable to water. The coating material preferably has magnetic field permeability, but even if it is non-permeable above a specified thickness, it can still be used as long as permeability can be ensured below the specified thickness.

Furthermore, in the first embodiment described above, the anti-fouling pad is circular, but it can also be other shapes besides circular, such as rectangular or annular. It should be noted that when an opening is formed in the center, like in an annular shape, it can also be used as an anti-fouling pad for a gas stove by being placed under the burner support of a gas stove other than an induction cooker. Therefore, in this invention, it can be used as an anti-fouling pad for both gas stoves and induction cookers, and both are included within the scope of this invention.

Furthermore, in the first embodiment described above, the thickness of the sheet, the thickness of the sheet material, the amount of coating material applied to the front and back sides respectively, and the total amount of coating material applied to the front and back sides are preferably set within specific ranges. However, as long as the maximum tear strength of the sheet is 5.0 kN/m or more and 240 kN/m or less, it may be set outside the specific range.

Example

To evaluate the influence of the tear strength of the aforementioned antifouling pad on the adhesion phenomenon and the influence of the sheet thickness on the temperature sensor, experiments were conducted.

In the experiments, samples of antifouling pads were prepared with variations in the type of glass fiber, the amount of coating material (silicone) on the surface and back (weight after drying), tear strength, sheet thickness, and the coating thickness of the surface and back (silicone) as shown in Table 1 below. The results of the experiments (Evaluation 1 and Evaluation 2), detailed later, are also shown in Table 1. Furthermore, information on each glass fiber shown in Table 1 is provided in Table 2 below.

[Table 1]

[Table 2]

To clarify, the tear strength in Table 1 was measured using the JIS K6252:2015 (trousers) constant-speed elongation test method, with a tensile speed of 10 cm/min. Tear strength refers to the maximum reading (maximum strength). Furthermore, the sheet thickness was the arithmetic mean of three measurements taken near the tear using a dial-type thickness gauge according to the method specified in JIS K 6250, section 10 (Dimensional Measurement Method). Additionally, the coating thickness on both the surface and back sides was obtained by observing the surface of the sheet under a scanning electron microscope (SEM) after burying it in epoxy resin with the cross-section as the observation surface. The coating thickness was measured at 10 points at 200 μm intervals in a direction orthogonal to the coating thickness (i.e., parallel to the fabric of the glass fiber sheet). The name of the scanning electron microscope (SEM) used for observing the cross-section of a slide and the measurement conditions are described below. Furthermore, as a pretreatment step for SEM observation, the slide to be observed is embedded in epoxy resin, mechanically polished, and then carbon vapor deposited.

Apparatus: Hitachi High Technology Corporation Scanning Electron Microscope (Model: S-3700N); Measurement conditions: 150x magnification, 5kV accelerating voltage, 10Pa vacuum; Obtaining reflected electron images.

In addition, these images obtained by scanning electron microscopy were analyzed using image analysis software (WinRoof 2018 manufactured by Mitanni) under the condition of measuring the distance between two points.

To further detail the tear strength determination, firstly, each sample was prepared as a trouser-shaped test piece (in each rectangular sample, a slit parallel to the length direction was cut from the center of one of the shorter sides). Next, for each test piece, with the slit as the starting point and the tear direction set at 45° relative to the glass fiber crease, the maximum force required to tear (maximum strength) was measured. It should be noted that the tear strength in JIS K6252:2015 (trouser-shaped) is defined as the value obtained by dividing the central value of the force required to tear from the slit (calculated using JIS K6274) by the thickness of the test piece. However, in the aforementioned samples where glass fiber is the main component, when tearing begins, the glass fiber mesh breaks off, causing the measured value to drop sharply, making it impossible to obtain appropriate measurement results. Therefore, in this experiment, instead of using the central value of the force required to tear, the maximum force required to tear (maximum strength) is divided by the thickness of the test piece as the tear strength value.

Next, the effect of each sample on the adhesion phenomenon was evaluated (Evaluation 1).

(1) Specifications of the equipment, etc. used in the measurement of Evaluation 1

Muffle furnace: Electric furnace (manufactured by Yamato Science Co., Ltd.: FO510)

Crystallized glass: Ultra-heat resistant crystallized glass: 3mm thick (manufactured by Nippon Electric Glass Co., Ltd.: Neoceramu N-0)

(2) Evaluation 1 Measurement Content

First, the crystallized glass containing each sample was heated in a muffle furnace at 300°C for 16 hours. After heating, it was cooled to room temperature, and the sample was peeled off the crystallized glass. The following conditions were assessed: ◎ indicates the sample was completely removed; ○ indicates that some silicone residue remained on the crystallized glass but could be easily removed with a finger; × indicates that silicone and glass fibers remained on the crystallized glass (including cases where the sample was torn).

(3) Evaluation of the measurement results of 1

The following information was determined based on the measurement results of Evaluation 1.

First, regarding Examples 1-3, in Examples 1 and 2, the specimen was cleanly peeled off. In contrast, in Example 3, which had the lowest tear strength, although it could be easily removed, the silicone of the specimen remained locally on the crystallized glass. Furthermore, in Comparative Example 1, where the amount of glass fiber in the fabric and the coating material on the surface were the same as in Example 3, but the amount of coating material on the back side was less and the tear strength was lower, the silicone and glass fiber of the specimen remained on the crystallized glass, resulting in the specimen tearing. It should be noted that in Examples 4 and Comparative Example 2, where the tear strength was higher than in Examples 1-3, the specimen was cleanly peeled off. Therefore, it can be said that the presence and extent of adhesion are due to the tear strength of the sheet.

Specifically, if the maximum tear strength of the sheet is above 5.0 kN/m, it has the specified tear strength, so when the antifouling pad is peeled off from the top plate, it is not easy for the antifouling pad to stick or break.

To clarify, for sheet materials with a maximum tear strength of 5.0 kN/m or higher, in order to ensure that the antifouling pad has both cushioning and the specified tear strength, the preferred fabric material is one with a thickness of 0.02 mm or higher, and the coating material has a coating amount of 5 g/ ^m² or higher on both the surface and the back, with a total coating amount of 20 g/ ^m² or higher.

However, among the samples mentioned above, although the sample with the largest sheet thickness (Comparative Example 2) exhibited the highest tear strength, increasing the sheet thickness would enhance the heat insulation effect of the anti-fouling pad. This is because if the heat insulation effect of the sheet is too high, the temperature of the pot will be difficult to transfer to the temperature sensor. Therefore, it can be said that even if the tear strength is high and adhesion is not easily generated, an anti-fouling pad with excessive heat insulation that hinders the proper operation of the temperature sensor is unsuitable for use.

Therefore, the effects of each sample's usage on the electromagnetic cooker were measured (Evaluation 2).

(4) Specifications of the equipment, etc. used in the determination of Evaluation 2

Electromagnetic cooker: Cooking heater (Made by Mitsubishi Electric: CS-G3205BDS)

Pot: Tempura pot (22cm diameter) (Ulshiyama Metal Industry: CS-100667)

Oil: Nissin Salad Oil (Nissin Origen Group)

Oil temperature measuring device: Infrared radiation thermometer (Manufactured by Sato Measuring Instruments: SK-8700I I)

(5) Evaluation 2 Measurement Content

Place each sample between the pot and the top plate, add 200cc of salad oil to the pot, and heat using the "frying function". The "frying function" refers to the function that uses a temperature sensor to detect the heat of the pot being heated through the top plate, and adjusts the heating amount according to the detected temperature to maintain the oil temperature at approximately 200°C.

It should be noted that the safe amount of oil to use in an electromagnetic cooker is 500cc or more. Therefore, the 200cc of oil used in this case is not an appropriate amount.

The condition where the oil temperature does not exceed 300℃ and the electromagnetic cooker automatically stops preheating (stops heating) is rated as ○, and the condition where the oil temperature exceeds 300℃ is rated as ×.

(6) Evaluation of the measurement results of 2

The following information was determined based on the measurement results of Evaluation 2.

In Examples 1-4 and Comparative Example 1, the oil temperature did not exceed 300°C, and the electromagnetic cooker automatically stopped heating. In contrast, in Comparative Example 2, where the sheet thickness and coating material thickness were the highest, the electromagnetic cooker did not automatically stop heating, and the oil temperature exceeded 300°C. This means that in Comparative Example 2, temperature control for frying was not performed, which also raised safety concerns. Therefore, it can be said that the sheet thickness and coating material thickness affect the proper operation of the temperature sensor in the electromagnetic cooker. It should be noted that since the sheet thickness is determined based on the thickness of the fabric (sheet material), the amount and thickness of the coating material on both sides, and the total amount and thickness of the coating material on both sides, it can also be said that these factors affect the proper operation of the temperature sensor.

Specifically, if the thickness of the plate is less than 0.74mm, it has less impact on the temperature sensor that detects the temperature of the top plate, thus reducing the possibility of malfunctions when using an electromagnetic cooker.

Furthermore, if the coating thickness of the coating material is less than 326.2 μm on both the surface and the back side, the impact on the temperature sensor that detects the temperature of the top plate is further reduced, and therefore it will not hinder the proper operation of the temperature sensor.

To clarify, for sheet materials with a thickness of 0.74 mm or less, in order to achieve the specified tear strength and reduce the impact on the temperature sensor detecting the top plate temperature, the maximum tear strength is preferably 5.0 kN/m or more and 240 kN/m or less. Furthermore, if the thickness of the fabric used as the material is 0.42 mm or less, and the coating amount of the coating material is 520 g/ ^m² or less on both the surface and the back side, it combines cushioning and the specified tear strength, and reduces the impact on the temperature sensor detecting the top plate temperature, thus it is more preferable. Moreover, if the total coating amount of the coating material is 570 g/ ^m² or less, the impact on the temperature sensor detecting the top plate temperature is further reduced, thus it is more preferable.

In conclusion, the tear strength of the anti-fouling pad is a factor that significantly affects its adhesion. The thickness of the anti-fouling pad sheet, the thickness of the sheet material, the amount and thickness of the coating material on both sides, and the total amount and thickness of the coating material on both sides are factors that significantly affect the working state of the electromagnetic cooker. Only by appropriately selecting these factors can the existence of the anti-fouling pad be meaningful.

That is, for the antifouling pad, the maximum tear strength of the sheet is preferably 5.0 kN/m or more and 240 kN/m or less. Furthermore, it is even more preferable that: the sheet thickness is 0.74 mm or less; the sheet material thickness is 0.02 mm or more and 0.42 mm or less; the coating amount on each side of the surface and back is 5 g/ ^m² or more and 520 g/ ^m² or less, the total coating amount is 20 g/ ^m² or more and 570 g/ ^m² or less; and the coating thickness on each side of the surface and back is 2 μm or more and 300 μm or less, the total coating thickness is 4 μm or more and 330 μm or less. It should be noted that if the maximum tear strength of the sheet is 15.0 kN/m or more, adhesion is less likely to occur, making it an even more preferable antifouling pad.

Industrial practicality

As described above, the anti-fouling pad for electromagnetic cookers of the present invention is applicable, for example, to preventing dirt and spills from the bottom of pots or other containers that are to be heated from adhering to the top plate of the electromagnetic cooker.

Claims (10)

1. A stain-resistant mat for an electromagnetic cooker, which is a stain-resistant mat (1) for an electromagnetic cooker used between the top plate (17) of the electromagnetic cooker (13a, 13b) and the bottom surface of the pot (19) heated by the electromagnetic cooker. It includes a heat-resistant sheet (2) that is permeable to magnetic field lines, The maximum tear strength of the sheet is above 5.0 kN/m and below 240 kN/m. 2. The anti-fouling pad for an electromagnetic cooker according to claim 1, wherein the thickness of the pad is 0.74 mm or less. 3. The anti-fouling mat for an electromagnetic cooker as described in claim 1 or 2, wherein, The sheet body includes: Sheet-like materials made of heat-resistant fibers, and A non-permeable coating material (4a, 4b) formed on both sides of the material; The thickness of the material is 0.02 mm or more and 0.42 mm or less. The coating material is applied to each of the front and back sides at a rate of 5 g/ ^m² or more and 520 g/ ^m² or less. 4. The anti-fouling pad for an electromagnetic cooker according to claim 3, wherein the total amount of the coating material applied to the sheet is more than 20 g/ ^m² and less than 570 g/ ^m² . 5. The anti-fouling mat for an electromagnetic cooker as described in claim 1 or 2, wherein, The sheet body includes: Sheet-like materials made of heat-resistant fibers, and A non-permeable coating material formed on both sides of the material; The thickness of the material is 0.02 mm or more and 0.42 mm or less. The coating material has a coating thickness of more than 2 μm and less than 300 μm on each of the front and back sides. 6. The anti-fouling pad for an electromagnetic cooker according to claim 5, wherein the total coating thickness of the coating material on the sheet is 4 μm or more and 330 μm or less. 7. The anti-fouling mat for an electromagnetic cooker according to claim 3, wherein the material comprises glass fiber. 8. The anti-fouling mat for an electromagnetic cooker according to claim 5, wherein the material comprises glass fiber. 9. The anti-fouling pad for an electromagnetic cooker according to claim 3, wherein the coating material comprises organosilicon. 10. The anti-fouling pad for an electromagnetic cooker according to claim 5, wherein the coating material comprises organosilicon.