Pollution prevention mat for electromagnetic cooker

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] The present invention relates to a stain prevention mat for an electromagnetic cooker, and more particularly to a stain prevention mat for an electromagnetic cooker that prevents stains and spills on the bottom surface of a pan to be heated from adhering to the top plate of the electromagnetic cooker.

Background Art

[0002] There is a stain prevention mat for an electromagnetic cooker that is used by being sandwiched between the top plate of the electromagnetic cooker and the bottom of the pan, as shown in Patent Document 1.

[0003] FIG. 3 is a plan view showing the external shape of a state in which a conventional stain prevention mat for an electromagnetic cooker is used in a general cooking heating device incorporating an electromagnetic cooker, and FIG. 4 is a view corresponding to line IV-IV shown in FIG. 3, which is a cross-sectional view schematically showing the operating principle of the electromagnetic cooker and an enlarged cross-sectional view of the conventional stain prevention mat for the electromagnetic cooker.

[0004] First, referring to FIG. 3, electromagnetic cookers 13a and 13b are installed on the left and right in front of the top plate 17 of the cooking heating device 61, and a heating wire heater 63 in which a nichrome wire is incorporated in the lower surface of the top plate 17 is installed behind the top plate 17. Note that the cooking heating device 61 may have an electromagnetic cooker installed in place of the heating wire heater 63 depending on the model (that is, it has three electromagnetic cookers), or may have no heating wire heater 63 and only two electromagnetic cookers. Also, an intake / exhaust panel 65 is arranged on the back side of the top plate 17. In this figure, a stain prevention mat 51 having magnetic permeability and heat resistance is arranged with respect to the electromagnetic cooker 13b, and a pan 19 to be heated is further arranged thereon.

[0005] Regarding the schematic structure of the electromagnetic cooker 13b and its heating principle, refer to Fig. 4(1). Below the top plate 17, a magnetic force generating coil 14 that constitutes the electromagnetic cooker 13b is arranged. When a current flows through the magnetic force generating coil 14 by turning on a switch (not shown), magnetic field lines 15 as shown by the two-dot chain line are generated around the magnetic force generating coil 14. These magnetic field lines 15 penetrate the top plate 17 and the dirt prevention mat 51, and further penetrate the bottom of the pot 19 placed on the top plate 17 to form a loop. Since the pot 19 is made of a material having a predetermined conductivity, an eddy current 16 is generated at the bottom of the pot due to the generation of the magnetic field lines 15. The eddy current 16 generated in this way is converted into heat by the electrical resistance of the bottom of the pot 19, and the temperature of the bottom of the pot rises. As a result, the food stored in the pot 19 is heated without passing through fire. When the energization of the magnetic force generating coil 14 is stopped, the magnetic field lines 15 disappear, and thereby the eddy current 16 generated at the bottom of the pot 19 also disappears. 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 when the temperature of the top plate 17 rises abnormally due to dry burning or the like, the power supply is cut off by a control device (not shown) to stop the heating.

[0006] Regarding the configuration of the dirt prevention mat 51, refer to Fig. 4(2) which is an enlarged view of the dirt prevention mat 51 in the "Z" part of Fig. 4(1) and Fig. 3. The dirt prevention mat 51 is obtained by cutting out a circular shape from a fabric 53 made of glass fiber having magnetic field line permeability and applying non-water-permeable and heat-resistant silicones 54a and 54b to the entire surfaces of both sides to form a sheet body 52. Since the dirt prevention mat 51 uses the fabric 53 as its central material, it has cushioning properties. Also, since the non-water-permeable and heat-resistant silicones 54a and 54b are applied to both of its surfaces, the entire dirt prevention mat 51 has non-water-permeability and heat resistance.

[0007] The anti-fouling mat 51, when in use, ensures that even when dirt adheres to the bottom surface of the pot 19 or cooking splashes occur, it does not directly adhere to the top plate 17 and maintains a clean state, thus eliminating the need for laborious cleaning. At the same time, by setting the thermal resistance of the sheet body 52 within a predetermined range, the influence on the measurement of the temperature sensor of the electromagnetic cooker is minimized, reducing the risk of malfunctions during the use of the electromagnetic cooker.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] When the conventional stain prevention mat 51 as shown in Patent Document 1 is placed on the electromagnetic cooker 13a or 13b and heated by cooking using the pan 19 on the stain prevention mat 51, it will be used in a state where the stain prevention mat 51 is in contact with the electromagnetic cooker 13a or 13b at high temperature. The stain prevention mat 51 has a chemical structure similar to that of the glass which is the material of the top plate of the top plate 17 for the silicone 54a and 54b. Therefore, there may occur a phenomenon that the silicone 54a or 54b located on the top plate 17 side adheres to the top plate 17 and the silicone 54a or 54b remains on the top plate 17. If this adhesion is mild, the adhered silicone 54a or 54b can be easily removed by rubbing the adhered part with a finger or a sponge containing detergent, etc. However, if the adhesion is strong, the stain prevention mat 51 itself may be in a state of being attached to the top plate 17 and cannot be removed from the top plate 17, and there is a risk that these may become the stain itself on the top plate 17. Also, when trying to peel the stain prevention mat 51 from the top plate 17 in the case of strong adhesion, there is also a risk that the stain prevention mat 51 may be torn as if torn from the adhered part. That is, not only the silicone 54a or 54b constituting the stain prevention mat 51 but also the glass fiber remains on the top plate 17.

[0010] This invention is made to solve the above problems, and an object thereof is to provide a stain prevention mat for an electromagnetic cooker in which adhesion and tearing are less likely to occur.

Means for Solving the Problems

[0011] In order to achieve the above object, the invention according to claim 1 is a stain prevention mat for an electromagnetic cooker used by being sandwiched between the top plate of the electromagnetic cooker and the bottom surface of the pan heated by the electromagnetic cooker, which is made of a heat-resistant sheet body having magnetic permeability, and the sheet body has a maximum tear strength of 5.0 kN / m or more and 240 kN / m or less.

[0012] With this configuration, the effect 1 of having a predetermined tear strength can be obtained.

[0013] The invention according to claim 2 is the invention according to claim 1, wherein the thickness of the sheet body is 0.74 mm or less.

[0014] With such a configuration, the effect 2 that the influence on the temperature sensor for detecting the temperature of the top plate is reduced can be obtained.

[0015] The invention according to claim 3 is the invention according to claim 1 or 2, wherein the sheet body is composed of 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 0.02 mm or more and 0.42 mm or less, and the coating material has a coating amount of 5 g / m 2 or more and 520 g / m 2 or less on each of the front and back surfaces.

[0016] With such a configuration, the effect 3 that it has both cushioning properties and a predetermined tear strength and the influence on the temperature sensor for detecting the temperature of the top plate is reduced can be obtained.

[0017] The invention according to claim 4 is the invention according to claim 3, wherein the total coating amount of the coating material of the sheet body is 20 g / m 2 or more and 570 g / m 2 or less.

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

[0019] The invention according to claim 5 is the invention according to claim 1 or 2, wherein the sheet body is composed of 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 0.02 mm or more and 0.42 mm or less, and the coating material has a coating thickness of 2 μm or more and 300 μm or less on each of the front and back surfaces.

[0020] With such a configuration, an effect 5 is obtained in which it has both cushioning properties and a predetermined tearing strength, and the influence on the temperature sensor that detects the temperature of the top plate is reduced.

[0021] The invention according to claim 6 is the invention according to claim 5, wherein the total coating thickness of the coating material of the sheet body is 4 μm or more and 330 μm or less.

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

[0023] The invention according to claim 7 is the invention according to claim 3, wherein the material contains glass fiber.

[0024] With such a configuration, an effect 7 is obtained in which the anti-fouling mat has both a predetermined heat resistance and strength and flexibility.

[0025] The invention according to claim 8 is the invention according to claim 5, wherein the material contains glass fiber.

[0026] With such a configuration, an effect 8 is obtained in which the anti-fouling mat has both a predetermined heat resistance and strength and flexibility.

[0027] The invention according to claim 9 is the invention according to claim 3, wherein the coating material contains silicone.

[0028] With such a configuration, an effect 9 is obtained in which the surface of the anti-fouling mat has anti-slip properties, heat resistance, and non-water permeability.

[0029] The invention according to claim 10 is the invention according to claim 5, wherein the coating material contains silicone.

[0030] With such a configuration, the surface of the anti-stain mat has the functions of anti-slip, heat resistance, and non-water permeability, and thus the effect 10 is obtained.

Advantages of the Invention

[0031] As described above, since the invention according to claim 1 provides the above effect 1, when peeling the anti-stain mat from the top plate, sticking and tearing are less likely to occur.

[0032] In addition to the effect of the invention according to claim 1, since the invention according to claim 2 provides the above effect 2, the possibility of problems occurring during the use of the electromagnetic cooker is reduced.

[0033] In addition to the effect of the invention according to claim 1 or claim 2, since the invention according to claim 3 provides the above effect 3, it is difficult to damage the top plate or the pot, and while preventing sticking and tearing, it is difficult to interfere with the proper operation of the temperature sensor.

[0034] In addition to the effect of the invention according to claim 3, since the invention according to claim 4 provides the above effect 4, it does not interfere with the proper operation of the temperature sensor.

[0035] In addition to the effect of the invention according to claim 1 or claim 2, since the invention according to claim 5 provides the above effect 5, it is difficult to damage the top plate or the pot, and while preventing sticking and tearing, it is difficult to interfere with the proper operation of the temperature sensor.

[0036] In addition to the effect of the invention according to claim 5, since the invention according to claim 6 provides the above effect 6, it does not interfere with the proper operation of the temperature sensor.

[0037] In addition to the effect of the invention according to claim 3, since the invention according to claim 7 provides the above effect 7, it has a predetermined strength and becomes an anti-stain mat excellent in heat resistance, impact resistance, and flexibility.

[0038] In addition to the effect of the invention according to claim 5, since the invention according to claim 8 provides the above effect 8, it has a predetermined strength and becomes an anti-stain mat excellent in heat resistance, impact resistance, and flexibility.

[0039] In addition to the effects of the invention described in claim 3, the invention described in claim 9 can obtain the above-described operation 9, and thus becomes an easy-to-use anti-fouling mat.

[0040] In addition to the effects of the invention described in claim 5, the invention described in claim 10 can obtain the above-described operation 10, and thus becomes an easy-to-use anti-fouling mat.

Brief Description of the Drawings

[0041]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

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

[0043] Referring to these figures, the anti-fouling mat 1 is for an electromagnetic cooker and is used by being sandwiched between the top plate of the electromagnetic cooker and the bottom surface of the pot heated by the electromagnetic cooker. It is formed by cutting out a heat-resistant sheet body 2 having magnetic permeability in a circular shape. The sheet body 2 is composed of a woven fabric 3 of a sheet-like material formed by plain-weaving glass fibers having a maximum tear strength of 5.0 kN / m or more and 240 kN / m or less and having magnetic permeability and heat resistance, and coating materials 4a and 4b formed on the entire surfaces of both sides of the woven fabric 3 and composed of silicone having water impermeability and heat resistance. In this specification, silicone means those including silicone resin, silicone rubber, and both of them. With such a configuration, since it has a predetermined tear strength, when peeling the anti-fouling mat 1 from the top plate, it is less likely to cause sticking or tearing of the anti-fouling mat 1. If the maximum tear strength of the sheet body 2 is 15.0 kN / m or more, slight sticking of the anti-fouling mat 1 is also less likely to occur, which is more preferable. Also, from the perspective of sticking, the upper limit of the maximum tear strength of the sheet body 2 is not particularly limited. However, the tear strength of the sheet body 2 varies depending on the thickness and fiber density of the woven fabric 3 including the glass fibers constituting the sheet body 2, and since these affect the reaction of the temperature sensor for detecting the temperature of the top plate, if the tear strength of the sheet body 2 is set to 240 kN / m or less, more preferably 210 kN / m or less, the influence on the reaction of the temperature sensor can also be reduced. Also, if the tear strength of the sheet body 2 is too large, the handleability and processability of the sheet body 2 during the manufacture of the anti-fouling mat 1 may deteriorate, and setting a tear strength more than necessary may also result in waste of resources in terms of the environment, which is not preferable. The outer peripheral end of the sheet body 2 may be edged over the entire circumference by a bias tape or the like having a U-shaped cross-section.

[0044] When the sheet-like material is made into a woven fabric 3 formed by weaving glass fibers in this way, the anti-stain mat 1 has a predetermined heat resistance, strength, and flexibility, so it becomes an anti-stain mat 1 with a predetermined strength and excellent heat resistance, impact resistance, and flexibility. Also, since general-purpose glass fibers that are commonly available can be used as the glass fibers, the manufacturing cost can be reduced. Furthermore, when the coating materials 4a and 4b are made of silicone, the surface of the anti-stain mat 1 has anti-slip properties, heat resistance, and non-water permeability, so it becomes an anti-stain mat 1 that is easy to use.

[0045] When the configuration and its effects of the anti-stain mat 1 are described in more detail, since the woven fabric 3 is used as the central material of the anti-stain mat 1, it has cushioning properties. Also, the eyes of the woven fabric 3 are filled by the non-water-permeable coating materials 4a and 4b, preventing dirt from reaching inside the woven fabric 3, so the entire anti-stain mat 1 has non-water permeability.

[0046] When the anti-stain mat 1 configured in this way is replaced with the anti-stain mat 51 shown in FIGS. 3 and 4 and placed on the top plate 17 of the electromagnetic cooker 13a or 13b, and a pan 19 is placed on it for use, the anti-stain mat 1 prevents dirt adhering to the bottom surface of the pan 19 and cooking splashes from directly adhering to the top plate 17, similar to the anti-stain mat 51.

[0047] In addition, due to its own cushioning properties, the anti-stain mat 1 is unlikely to damage the top plate 17 or the pan 19 during use, and there is also no risk of the anti-stain mat 1 itself cracking, so it is easy to handle. Also, the woven fabric 3 made of glass fibers is not only a material with excellent cushioning properties but also excellent in heat resistance and impact resistance, so the reliability during use is further improved. Also, since it is an inexpensive material, it becomes an anti-stain mat 1 that is excellent in terms of cost (economic efficiency).

[0048] Furthermore, since the coating materials 4a and 4b have heat resistance, there is no risk of melting or the like even during heat cooking, and they exhibit anti-slip properties with respect to the bottom surface of the pan 19 and the top plate 17, thus improving usability. Further, since the coating materials 4a and 4b have water repellency, not only is there no risk of liquid dirt penetrating into the interior of the woven fabric 3, but it can be easily washed with water, enabling more hygienic use of the dirt prevention mat 1.

[0049] In addition, the thickness of the sheet body 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, and the risk of problems occurring when using the electromagnetic cooker 13a or 13b is decreased.

[0050] Also, 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 in each of the coating material 4a on the surface and the coating material 4b on the back surface, the coating amount (weight after drying) is 5 g / m 2 or more and 520 g / m 2 or less, preferably 10 g / m 2 or more, more preferably 20 g / m 2 or more and 150 g / m 2 or less. With this configuration, it has both cushioning properties and a predetermined tear strength, and the influence on the temperature sensor 18 that detects the temperature of the top plate 17 is reduced, making it less likely to damage the top plate 17 and the pan 19 while preventing the dirt prevention mat 1 from sticking or tearing, and less likely to interfere with the proper operation of the temperature sensor 18. Also, particularly when the coating amount is 150 g / m 2 or less, waste of the coating materials 4a and 4b can be saved, resulting in a cost-saving and resource-saving dirt prevention mat 1.

[0051] Furthermore, in the sheet body 2, the total coating amount (weight after drying) of the coating materials 4a and 4b is preferably 20 g / m 2 or more and 570 g / m 2 or less, preferably 30 g / m 2 or more and 300 g / m 2It is more preferable that it is as follows. When configured in this way, the influence on the temperature sensor 18 that detects the temperature of the top plate 17 is further reduced, so that the proper operation of the temperature sensor 18 is not hindered.

[0052] Further, it is preferable that the coating material has a coating thickness (thickness after drying) of 2 μm or more and 300 μm or less, and more preferably 10 μm or more and 90 μm or less, on each of the front and back surfaces. When configured in this way, it has both cushioning properties and a predetermined tear strength, and the influence on the temperature sensor 18 that detects the temperature of the top plate 17 is reduced. Thus, it is difficult to damage the top plate 17 and the pot 19, and while preventing the fixing and tearing of the stain prevention mat 1, it is difficult to hinder the proper operation of the temperature sensor 18. Also, since waste of the coating materials 4a and 4b can be saved, the stain prevention mat 1 is cost-saving and resource-saving.

[0053] Furthermore, it is preferable that the total coating thickness (thickness after drying) of the coating material of the sheet body is 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. When configured in this way, the influence on the temperature sensor 18 that detects the temperature of the top plate 17 is further reduced, so that the proper operation of the temperature sensor 18 is not hindered.

[0054] In addition, in the above-described first embodiment, the stain prevention mat is composed of a woven fabric and coating materials formed on both sides of the woven fabric, but it may also be composed only of silicone.

[0055] Also, in the above-described first embodiment, the sheet-like material is a woven fabric obtained by plain-weaving glass fibers, but it may contain glass fibers partially, and may also be composed of other fibers having magnetic field line permeability and heat resistance, or other materials. For example, it may be a non-woven fabric made of glass fibers, a woven fabric or non-woven fabric made of carbon fibers, ceramic fibers, etc., or paper.

[0056] Furthermore, in the above-described first embodiment, the coating material was formed on the entire surfaces of both sides of the woven fabric, but it may be formed only on a part thereof. Alternatively, it may be formed only on one side, or it may not be provided at all.

[0057] Furthermore, in the above-described first embodiment, the coating material was composed of silicone, but it may contain silicone in part, or it may be composed of other members having water impermeability. The coating material preferably has permeability to magnetic field lines, but even if it is non-permeable at a thickness of a predetermined thickness or more, it can be used in the same manner as long as permeability can be ensured by setting the thickness to be equal to or less than the predetermined thickness.

[0058] Furthermore, in the above-described first embodiment, the anti-fouling mat has a circular shape, but it may have other shapes such as a rectangular shape or a donut shape, other than the circular shape. When an opening is formed in the central portion like a donut shape, it can also be used as an anti-fouling mat for a gas stove by installing it under the hearth of a gas stove other than the electromagnetic cooker. Therefore, in the present invention, even if it can be used as an anti-fouling mat for a gas stove, as long as it can also be used as an anti-fouling mat for an electromagnetic cooker, it shall be included in the scope of the present invention.

[0059] Furthermore, in the above-described first embodiment, 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 of the front and back sides were set within specific ranges, but if the maximum strength of the tearing strength of the sheet body is 5.0 kN / m or more and 240 kN / m or less, it may be set outside the specific ranges.

Examples

[0060] An experiment was conducted to evaluate the degree of influence of the tearing strength of the above-described anti-fouling mat on the sticking phenomenon, and the degree of influence of the thickness of the sheet body on the temperature sensor.

[0061] In the experiment, samples of anti-fouling mats were prepared by changing the type of glass fiber, the coating amount (weight after drying) of the coating materials (silicone) on the front and back surfaces, the tearing strength, the thickness of the sheet body, and the coating thickness of the coating materials (silicone) on the front and back surfaces as shown in Table 1 below. In Table 1, the results of experiments (Evaluation 1 and Evaluation 2) whose details will be described later are also shown. Also, the information on each glass fiber shown in Table 1 is as shown in Table 2 below.

[0062]

Table 1

[0063]

Table 2

[0064] To describe the measurement of the tearing strength in more detail, first, test pieces formed into trouser shapes (in each rectangular sample, a cut was made parallel to the longitudinal direction from the center of one short side end) were prepared. Next, for each test piece, starting from the cut, with the tearing direction being 45° with respect to the fold of the glass fiber, the maximum value of the force required to tear (maximum strength) was measured. Incidentally, the tearing strength in JIS K6252:2015 (trouser shape) is defined as the value obtained by dividing the median value of the force required to tear starting from the cut, as determined by JIS K6274, by the thickness of the test piece. However, in each of the above samples with glass fiber as the main component, when tearing starts, a phenomenon occurs where the glass fiber mesh comes out, causing the measured value to drop rapidly and making it impossible to obtain appropriate measurement results. Therefore, in this experiment, instead of the median value of the force required to tear, the value obtained by dividing the maximum value of the force required to tear (maximum strength) by the thickness of the test piece is adopted as the value of the tearing strength.

[0065] Next, the influence of each sample on the adhesion phenomenon (Evaluation 1) was evaluated. (1) Specifications of equipment and the like used in the measurement of Evaluation 1 Muffle furnace: Electric furnace (manufactured by Yamato Scientific Co., Ltd.: FO510) Crystallized glass: Super heat-resistant crystallized glass: thickness 3 mm (manufactured by Nippon Electric Glass Co., Ltd.: Neoceram N-0) (2) Measurement content of Evaluation 1 First, a sample of each sample placed on the crystallized glass was heated in a muffle furnace at 300 °C for 16 hours. After the heating was completed, it was cooled to room temperature and then the sample was peeled off from the crystallized glass. When peeling, if the sample was peeled off neatly, it was evaluated as ◎; if part of the silicone of the sample remained on the crystallized glass but could be easily removed by rubbing with fingers, it was evaluated as 〇; if the silicone and glass fiber of the sample remained on the crystallized glass (including the case where the sample was torn), it was evaluated as ×. (3) Measurement results of Evaluation 1 The following information was found from the measurement results of Evaluation 1.

[0066] First, in Examples 1 to 3, in Examples 1 and 2, the specimen peeled off cleanly. In Example 3, which had the lowest tear strength, although it could be removed easily, part of the silicone of the specimen remained on the crystallized glass. Also, while the glass fiber of the woven fabric and the coating amount of the coating material on the surface were the same as in Example 3, in Comparative Example 1, where the coating amount of the coating material on the back surface was less than that in Example 3 and the tear strength was low, the silicone and glass fiber of the specimen remained on the crystallized glass, resulting in tearing of the specimen. In Examples 4 and Comparative Example 2, which had higher tear strength than Examples 1 to 3, the specimen peeled off cleanly. Therefore, it can be said that the presence and degree of the sticking phenomenon are due to the high or low tear strength of the sheet body.

[0067] Specifically, if the maximum strength of the tear strength of the sheet body is 5.0 kN / m or more, in order to have a predetermined tear strength, when peeling the anti-fouling mat from the top plate, it is less likely to cause sticking or tearing of the anti-fouling mat.

[0068] In addition, in a sheet body where the maximum strength of the tear strength is 5.0 kN / m or more, in order for the anti-fouling mat to have both cushioning properties and a predetermined tear strength, the woven fabric as the material should have a thickness of 0.02 mm or more, and the coating material should 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 or more, which is preferable.

[0069] By the way, in the above samples, the sample with the largest value of the sheet body thickness (Comparative Example 2) has the highest tear strength, but an increase in the sheet body thickness causes an increase in the heat insulation effect of the anti-fouling mat. In addition, if the heat insulation effect of the sheet body becomes too high, it becomes difficult for the temperature of the pot to be transmitted to the temperature sensor. Then, even if the tear strength is high and the sticking phenomenon is less likely to occur, an anti-fouling mat with too high a heat insulation effect that hinders the proper operation of the temperature sensor is not suitable for use.

[0070] Therefore, the influence on the electromagnetic cooker in the usage state of each sample (Evaluation 2) was measured. (4) Specifications of equipment and the like used for the measurement of Evaluation 2 Electromagnetic cooker: Cooking heater (manufactured by Mitsubishi Electric: CS-G3205BDS) Pan: Special tempura pan: Pan diameter 22 cm (manufactured by Urushiyama Metal Industry: CS-100667) Oil: Nissin salad oil (Nissin Oillio Group) Oil temperature measuring device: Infrared radiation thermometer (manufactured by Sato Measuring Instruments: SK-8700II) (5) Measurement content of Evaluation 2 Each sample was set between the pan and the top plate, 200 cc of salad oil was put into the pan, and it was heated using the "deep-frying function". The "deep-frying function" means that the heat of the heated pan is detected by the temperature sensor through the top plate, and based on this detected temperature, the heating amount is adjusted to keep the oil temperature at approximately 200°C.

[0071] Incidentally, for the electromagnetic cooker used, the amount of oil that can be used safely is 500 cc or more. Therefore, the oil amount of 200 cc this time is not an appropriate usage amount.

[0072] When the oil temperature did not exceed 300°C and the electromagnetic cooker automatically finished preheating (heating stopped), it was evaluated as ○, and when it exceeded 300°C, it was evaluated as ×. (6) Measurement results of Evaluation 2 The following content was found from the measurement results of Evaluation 2.

[0073] In Examples 1 to 4 and Comparative Example 1, the electromagnetic cooker automatically stopped heating without the oil temperature exceeding 300°C. In contrast, in Comparative Example 2 where the values of the thickness of the sheet body and the coating thickness of the coating material were the largest, the electromagnetic cooker did not automatically stop heating and the oil temperature exceeded 300°C. This means that in Comparative Example 2, temperature control as a frying function was not performed, and there was also a safety problem. Therefore, it can be said that the thickness of the sheet body and the coating thickness of the coating material affect the proper operation of the temperature sensor of the electromagnetic cooker. Note that since the thickness of the sheet body 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, it can also be said that these 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, so the possibility of problems occurring when using the electromagnetic cooker is reduced.

[0075] Also, if the total of the coating thicknesses of the coating material on the front and back surfaces is 326.2 μm or less, the influence on the temperature sensor that detects the temperature of the top plate is further reduced, so it does not prevent the proper operation of the temperature sensor.

[0076] Note that in a sheet body with a thickness of 0.74 mm or less, in order to reduce the influence on the temperature sensor while having a predetermined tearing strength, it is preferable that the maximum strength of the tearing strength is 5.0 kN / m or more and 240 kN / m or less. Also, if the thickness of the woven fabric as the material is 0.42 mm or less and the coating amount of the coating material is 520 g / m 2 or less in each of the front and back surfaces, it is more preferable because it has both cushioning properties and a predetermined tearing strength and the influence on the temperature sensor that detects the temperature of the top plate is reduced. Furthermore, if the total coating amount of the coating material is 570 g / m 2 or less, it is even more preferable because the influence on the temperature sensor that detects the temperature of the top plate is further reduced.

[0077] From the above, it can be said that the tearing strength of the anti-stain mat has a great influence on the sticking phenomenon of the anti-stain mat, and the thickness of the sheet body of the anti-stain mat, the thickness of the 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 have a great influence on the operating state of the electromagnetic cooker. Only with appropriate selection can the existence of the anti-stain mat be meaningful.

[0078] That is, in the anti-stain mat, the maximum strength of the tearing strength of the sheet body is preferably 5.0 kN / m or more and 240 kN / m or less. 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 for the coating material, the coating amount on each of the front and back surfaces is 5 g / m 2 or more and 520 g / m 2 or less, and the total coating amount is 20 g / m 2 or more and 570 g / m 2 or less, and the coating thickness on each of the front and back surfaces is 2 μm or more and 300 μm or less, and the total coating thickness is 4 μm or more and 330 μm or less, which can be said to be more preferable. In addition, if the maximum strength of the tearing strength of the sheet body is 15.0 kN / m or more, the sticking phenomenon itself is less likely to occur, and it becomes a more preferable anti-stain mat.

Explanation of symbols

[0079] 1... Anti-stain mat 2... Sheet body 3... Woven fabric 4a, 4b... Coating material 13a, 13b... Electromagnetic cooker 17... Top plate 19... Pot In addition, the same reference numerals in each figure indicate the same or corresponding parts.

Claims

1. In an induction cooktop stain prevention mat used by being placed between the top plate of an induction cooktop and the bottom surface of a pot heated by the induction cooktop, It consists of a heat-resistant sheet body that is permeable to magnetic field lines, At least one surface of the sheet body that is in contact with the top plate is made of silicone. The aforementioned sheet material is a stain-resistant mat for induction cooktops, having a maximum tear strength of 5.0 kN / m or more and 240 kN / m or less.

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

3. The aforementioned sheet body is A sheet-like material composed of heat-resistant fibers, It consists of a coating material formed on both sides of the aforementioned material and having no water permeability, The aforementioned material has a thickness of 0.02 mm or more and 0.42 mm or less. The coating material has a coating amount of 5 g / m² on both the front and back surfaces. ２ 520g / m or more ２ The following is a stain-preventing mat for induction cookers according to claim 1 or claim 2.

4. The aforementioned sheet body is The total amount of coating material applied is 20 g / m². ２ More than 570g / m ２ The following is the stain-preventing mat for induction cookers according to claim 3.

5. The aforementioned sheet body is A sheet-like material composed of heat-resistant fibers, It consists of a coating material formed on both sides of the aforementioned material and having no water permeability, The aforementioned material has a thickness of 0.02 mm or more and 0.42 mm or less. The coating material has a coating thickness of 2 μm or more and 300 μm or less on both the front and back surfaces, respectively, as described in claim 1 or claim 2, for an induction cooktop stain-preventing mat.

6. The aforementioned sheet body is The stain-preventing mat for induction cookers according to claim 5, wherein the total coating thickness of the coating material is 4 μm or more and 330 μm or less.

7. The aforementioned material includes glass fiber, as described in claim 3, for use as a stain-resistant mat for induction cookers.

8. The aforementioned material includes glass fiber, as described in claim 5, for use as a stain-resistant mat for induction cookers.

9. The coating material comprises silicone, as described in claim 3, for the stain-resistant mat for induction cookers.

10. The coating material comprises silicone, as described in claim 5, for the stain-resistant mat for induction cookers.

Images