JP7644160B2 - Stain prevention mat for induction cookers - Google Patents

Description

This invention relates to a stain-prevention mat for an electromagnetic cooker, and in particular to a stain-prevention mat for an electromagnetic cooker that prevents dirt on the bottom of a pot to be heated, overflow, etc. from adhering to the top plate of the electromagnetic cooker.

When cooking with an induction cooker, if a pot is placed directly on the top plate of the induction cooker, problems can occur where dirt from the bottom of the pot or food splashes get onto the top plate. To prevent this from happening, a stain prevention mat for induction cookers has traditionally been used, which is placed between the top plate of the induction cooker and the bottom of the pot.

Patent Document 1 discloses a stain prevention mat made by cutting a woven fabric made of glass fibers that is permeable to magnetic lines of force, with non-permeable, heat-resistant silicone applied to both sides of the fabric, into a circular sheet.

Figure 3 is a cross-sectional view that shows a conventional stain-prevention mat for an electromagnetic cooker when used with an electromagnetic cooker.

Referring to the figure, the stain-prevention mat 51 is placed on the top plate 52 of the induction cooker, and a pot 53 is placed above it.

The stain prevention mat 51 has cushioning properties because it uses woven fabric as its core material. In addition, both sides of the mat are coated with water-impermeable, heat-resistant silicone, so the entire stain prevention mat 51 is water-impermeable and heat-resistant.

When the stain-prevention mat 51 is used, even if dirt adheres to the bottom surface 54 of the pot 53 or food splashes onto it, the dirt does not adhere directly to the top plate 52, keeping it in good condition and eliminating the need for the trouble of cleaning.

In addition, the silicone-coated surface has tackiness (surface stickiness), so it fits snugly to the top plate 52, which is a glass tabletop, preventing the stain prevention mat 1 from slipping during cooking.

Patent Document 2 discloses a protective mat that has a sheet-like substrate made of glass fiber, with a first coating layer and a second coating layer made of silicone rubber formed on both sides of the substrate. The second coating layer has a predetermined surface unevenness, friction coefficient, and composite Young's modulus that are equivalent to those of the first coating layer.

This construction is said to provide a moderately large frictional resistance between the top plate of the induction cooker and the silicone rubber particles of the first coating layer of the protective mat, preventing the mat from slipping during cooking. In addition, either the first or second coating layer can be used in the same way, so it is unlikely for just one side to wear out, making it possible to work comfortably for long periods of time.

JP 2009-140887 A JP 2015-128081 A

As shown in FIG. 3 above, when the stain prevention mat 51 is installed, the first surface, which is the lower surface, contacts the top plate 52 of the induction cooker, while the second surface, which is the upper surface, contacts the bottom surface 54 of the pot 53.

The mat in Patent Document 2 has equal friction resistance on both sides, so when a pot 53 (including a frying pan or other cooking utensil used with an electromagnetic cooker) is placed on the stain-prevention mat 51 and shaken during cooking, there is a risk that the stain-prevention mat 51 will move together with the pot 53 and become displaced from its designated installation position.

This invention was made to solve the above problems, and aims to provide a stain-prevention mat for electromagnetic cookers that prevents cooking utensils, such as pots, from moving when cooking.

In order to achieve the above object, the invention described in claim 1 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 surface of a pot heated by the electromagnetic cooker, comprising a heat-resistant sheet body that is permeable to magnetic lines, in which when the surface of the sheet body that comes into contact with the electromagnetic cooker is designated as a first surface and the surface opposite to the first surface that comes into contact with the bottom surface of the pot is designated as a second surface, the static friction coefficient of the first surface is greater than the static friction coefficient of the second surface, the difference between the static friction coefficient of the first surface and the static friction coefficient of the second surface is 0.08 or more and 0.60 or less, the static friction coefficient of the first surface is 0.50 or more and 0.90 or less, and the static friction coefficient of the second surface is 0.30 or more and 0.71 or less .

In this way, the first surface of the sheet body has stronger tackiness than the second surface of the sheet body, which reduces the risk of minute movements occurring when the electromagnetic cooker is in operation and makes it easier to accurately install the sheet body in a predetermined position on the top plate.
The invention described in claim 2 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 surface of a pot heated by the electromagnetic cooker, comprising a heat-resistant sheet body that is permeable to magnetic lines, wherein when the surface of the sheet body that comes into contact with the electromagnetic cooker is designated as a first surface and the surface opposite to the first surface that comes into contact with the bottom surface of the pot is designated as a second surface, the static friction coefficient of the first surface is greater than the static friction coefficient of the second surface, and the difference between the static friction coefficients of the first surface and the second surface is 0.08 or more and 0.60 or less, coating materials are formed on both sides of the sheet body, and the coating material formed on the first surface side is thicker than the coating material formed on the second surface side.
With this configuration, the first surface of the sheet body has stronger tackiness than the second surface of the sheet body.

The invention described in claim 3 is the structure of the invention described in claim 2 , in which the static friction coefficient of the first surface is 0.50 or more and 0.90 or less, and the static friction coefficient of the second surface is 0.30 or more and 0.71 or less.

This configuration reduces the risk of minute movements occurring when the induction cooker is in operation, and also makes it easier to accurately place the sheet body in the designated position on the top plate.

The invention described in claim 4 is a configuration of the invention described in any one of claims 1 to 3, in which the sheet body comprises a sheet-like fiber composed of heat-resistant fibers and a coating material formed on both sides of the sheet-like fiber and having water impermeability.

This configuration provides cushioning and uniform tackiness on one side.

The invention described in claim 5 is the configuration of the invention described in claim 4 , in which the coating amount of the coating material formed on the first surface is 13 g/ ^m2 or more and 500 g/ ^m2 or less in dry weight, and the coating amount of the coating material formed on the second surface is 5 g/ ^m2 or more and 60 g/ ^m2 or less in dry weight.

When configured in this way, the sheet has a predetermined static friction coefficient on each side.

The invention described in claim 6 is the configuration of the invention described in claim 4 , in which the coating thickness of the coating material formed on the first surface is 7 μm or more and 286.1 μm or less, and the coating thickness of the coating material formed on the second surface is 2 μm or more and 34.3 μm or less.

When configured in this way, the sheet has a predetermined static friction coefficient on each side.

The seventh aspect of the present invention is directed to the fourth aspect of the present invention, in which the sheet-like fiber contains glass fiber.

This construction results in a stain-prevention mat with a certain strength, excellent heat resistance, impact resistance, and flexibility.

The invention described in claim 8 is the same as the invention described in claim 5 , in which the sheet-like fiber contains glass fiber.

This construction results in a stain-prevention mat with a certain strength, excellent heat resistance, impact resistance, and flexibility.

The invention described in claim 9 is the same as the invention described in claim 6 , in which the sheet-like fiber contains glass fiber.

This construction results in a stain-prevention mat with a certain strength, excellent heat resistance, impact resistance, and flexibility.

According to a tenth aspect of the present invention, in the configuration of the fourth aspect of the present invention, the coating material contains silicone.

When constructed in this way, the surface of the stain prevention mat is slip-resistant, heat-resistant, and water-impermeable.

The invention described in claim 11 is the same as the invention described in claim 5 , in which the coating material contains silicone.

When constructed in this way, the surface of the stain prevention mat is slip-resistant, heat-resistant, and water-impermeable.

In accordance with a twelfth aspect of the present invention, in the configuration of the sixth aspect of the present invention, the coating material contains silicone.

When constructed in this way, the surface of the stain prevention mat is slip-resistant, heat-resistant, and water-impermeable.

As explained above, in the invention described in claim 1, the first surface of the sheet body has stronger tackiness than the second surface, so the pan can be shaken while the sheet body is kept fitted to the top plate. In addition, the risk of minute movements occurring when the electromagnetic cooker is in operation is reduced, and the sheet body can be easily and accurately installed in a specified position on the top plate, improving usability.
In the invention described in claim 2, the first surface of the sheet body has stronger tackiness than the second surface, so that the pot can be shaken while the sheet body remains fitted to the top plate.

The invention described in claim 3 , in addition to the effects of the invention described in claim 2 , reduces the risk of minute movements occurring when the induction cooker is in operation and makes it easier to accurately install the sheet body in a specified position on the top plate, thereby improving usability.

The invention described in claim 4 has the effects of any of the inventions described in claims 1 to 3, and in addition has cushioning properties and uniform tackiness on one side, making it less likely to scratch top plates or pots and making the tackiness easier to control.

In addition to the effects of the invention described in claim 4 , the invention described in claim 5 provides a sheet having a predetermined static friction coefficient on each of its two sides, thereby stably exhibiting the desired tackiness.

In addition to the effects of the fourth aspect of the present invention, the sixth aspect of the present invention provides a sheet having a predetermined static friction coefficient on each of its two sides, thereby stably exhibiting the desired tackiness.

The seventh aspect of the invention provides, in addition to the effects of the fourth aspect, a stain-prevention mat that has a predetermined strength and is excellent in heat resistance, impact resistance, and flexibility, thereby improving usability.

The invention according to claim 8 provides a stain-prevention mat having a predetermined strength and excellent heat resistance, impact resistance and flexibility in addition to the effects of the invention according to claim 5 , thereby improving usability.

The invention according to claim 9 provides a stain-prevention mat having a predetermined strength and excellent heat resistance, impact resistance, and flexibility in addition to the effects of the invention according to claim 6 , thereby improving usability.

The invention described in claim 10 has the effects of the invention described in claim 4 , and in addition, the surface of the stain-prevention mat has anti-slip properties, heat resistance, and water impermeability, making it an easy-to-use stain-prevention mat.

The invention described in claim 11 has the effects of the invention described in claim 5 , and in addition, the surface of the stain-prevention mat has anti-slip properties, heat resistance, and water impermeability, making it an easy-to-use stain-prevention mat.

The invention described in claim 12 has the effects of the invention described in claim 6 , and in addition, the surface of the stain-prevention mat has anti-slip properties, heat resistance, and water impermeability, making it an easy-to-use stain-prevention mat.

1 is a perspective view showing a stain prevention mat for an electromagnetic cooker according to a first embodiment of the present invention; 2 is an enlarged cross-sectional view taken along the line II-II shown in FIG. 1. FIG. 1 is a cross-sectional view showing a conventional stain-prevention mat for an electromagnetic cooker when used with the electromagnetic cooker.

Figure 1 is a perspective view showing a stain prevention mat for an electromagnetic cooker according to a first embodiment of the present invention, and Figure 2 is an enlarged cross-sectional view of line II-II shown in Figure 1.

Referring to these figures, the stain prevention mat 1 is a circular sheet body, and is mainly composed of a sheet-like fiber woven fabric 7 made of plain-woven glass fibers that are permeable to magnetic lines and heat-resistant, and coating materials 8a, 8b made of silicone that is water-impermeable and heat-resistant and formed on both sides of the woven fabric 7. In this specification, silicone refers to silicone resin, silicone rubber, and both.

In this way, when the sheet-like material is a woven fabric 7 formed by weaving glass fibers, the stain-prevention mat 1 has a certain strength and is excellent in heat resistance, impact resistance, and flexibility. In addition, since the glass fibers can be general-purpose glass fibers that are generally available, it is possible to reduce manufacturing costs. Furthermore, when the coating materials 8a and 8b are made of silicone, the surface of the stain-prevention mat 1 has anti-slip properties, heat resistance, and water impermeability, making the stain-prevention mat 1 easy to use.

To go into more detail about the structure and effects of the stain-prevention mat 1, the stain-prevention mat 1 has cushioning properties because it uses woven fabric 7 as its central material. In addition, the mesh of the woven fabric 7 is filled with the water-impermeable coating materials 8a and 8b, preventing dirt from reaching the inside of the woven fabric 7, so the entire stain-prevention mat 1 is water-impermeable.

When using the stain-prevention mat 1, it is placed between the top plate 52 of the electromagnetic cooker and the bottom surface 54 of the pot 53 heated by the electromagnetic cooker, similar to the conventional stain-prevention mat 51 shown in FIG. 3 above. That is, the first surface 2 of the stain-prevention mat 1 is the lower surface in the installed state and is the surface that contacts the top plate 52 of the electromagnetic cooker, and the second surface 3, which is the surface opposite the first surface 2, is the surface that contacts the bottom surface 54 of the pot 53. In this way, the stain-prevention mat 1 prevents dirt and food splashes adhering to the bottom surface 54 of the pot 53 from directly adhering to the top plate 52.

The soil-prevention mat 1 is easy to handle because it does not scratch the top plate 52 or pot 53 or break during use due to its own cushioning properties. The woven fabric 7 made of glass fiber is also a material that has excellent cushioning properties as well as heat and impact resistance, further improving reliability during use. The soil-prevention mat 1 is also cost-effective (economical).

Furthermore, the coating materials 8a and 8b are heat resistant, so there is no risk of them melting during cooking, and they are non-slip on the bottom surface of the pot 53 and the top plate 52, making them even easier to use. Furthermore, the coating materials 8a and 8b are water repellent, so not only is there no risk of liquid dirt penetrating into the woven fabric 7, but they can also be easily washed with water, making it possible to use the stain prevention mat 1 in a more hygienic manner.

Next, there is a difference in the amount of coating of the coating materials 8a and 8b, and the amount of coating of the coating material 8a formed on the first surface 2 side of the stain-prevention mat 1 is set to be greater than the amount of coating of the coating material 8b formed on the second surface 3 side.

The static friction coefficient of the first surface 2 of the stain prevention mat 1 is configured to be greater than the static friction coefficient of the second surface 3. The smaller the static friction coefficient, the more slippery the surface is, i.e., the less tacky it is. The larger the static friction coefficient, the less slippery the surface is, and the more tacky it is.

Here, if the tackiness of the first surface 2 is too weak, the stain-prevention mat 1 will be difficult to fix in position after installation, and there is a risk that it may move during cooking. On the other hand, if the tackiness of the first surface 2 is too strong, when the stain-prevention mat 1 is installed on the top plate 52, the first surface 2 will stick firmly to the top plate 52, and even if you try to fine-tune the position by slightly shifting the stain-prevention mat 1 after installation, it will not move easily, and there is a risk that it will be difficult to install the stain-prevention mat 1 in the specified position.

Also, if the tackiness of the second surface 3 is too weak, the surface is slippery, so the pot 53 may shift during cooking, which may cause problems with cooking. That is, in an electromagnetic cooker, magnetic lines are generated from a coil installed under the top plate 52, which generates eddy currents on the bottom surface 54 of the pot 53, which generates heat. At that time, the pot 53 vibrates slightly, and if the tackiness of the second surface 3 is too weak, the tackiness cannot absorb the vibrations and the pot 53 tends to slide on the second surface 3, which ultimately leads to the pot 53 shifting from its designated position on the top plate 52. On the other hand, if the tackiness of the second surface 3 is too strong, resistance will be generated between the pot 53 and the second surface 3 due to the tackiness of the second surface 3 of the stain prevention mat 1 when the pot 53 is moved in a fanning manner during cooking, which will hinder the movement of the pot 53. In the worst case, when the bottom of the pot 53 is brought into contact with the second surface 3, the pot 53 may get caught on the second surface 3, making it difficult to shake the pot 53 during cooking. Furthermore, if the balance between the tackiness of the first surface 2 and the tackiness of the second surface 3 is poor, when the pot 53 is moved during cooking so that the bottom of the pot 53 comes into contact with the second surface 3, the second surface 3 gets caught on the bottom of the pot 53 and the first surface 2 easily slips off the top plate 52, resulting in the stain prevention mat 1 peeling off from the top plate 52 during cooking.

As described above, the tackiness of the first surface 2 and the second surface 3 are closely related. In order to achieve both and improve the feel when cooking, the stain prevention mat 1 of the present invention is configured so that the difference between the static friction coefficient of the first surface 2 and the static friction coefficient of the second surface 3 is 0.08 or more and 0.60 or less.

By configuring it in this way, the first surface 2 has stronger tackiness than the second surface 3, so you can shake the pot while keeping the stain prevention mat 1 fitted to the top plate.

Moreover, it is more preferable that the difference between the static friction coefficient of the first surface 2 and the static friction coefficient of the second surface 3 is 0.10 or more and 0.60 or less. By configuring it in this way, the feel when shaking the pot during cooking is further improved.

Furthermore, it is preferable that the static friction coefficient of the first surface 2 is 0.50 or more and 0.90 or less, and the static friction coefficient of the second surface 3 is 0.30 or more and 0.71 or less. This configuration reduces the risk of minute movements occurring when the electromagnetic cooker is in operation, and also makes it easier to accurately install the sheet body in a specified position on the top plate, improving usability.

It is also preferred that the coating amount of the coating material 8a formed on the first surface 2 is 13 g/ ^m2 or more and 500 g/ ^m2 or less in dry weight, and the coating amount of the coating material 8b formed on the second surface 3 is 5 g/ ^m2 or more and 60 g/ ^m2 or less in dry weight. By configuring in this way, a sheet body having a predetermined static friction coefficient on each of both surfaces is formed, and the desired tackiness is stably exhibited.

Furthermore, it is preferable that the coating thickness (thickness after drying) of the coating material 8a formed on the first surface 2 is 7 μm or more and 286.1 μm or less, and the coating thickness of the coating material 8b formed on the second surface 3 is 2 μm or more and 34.3 μm or less. By configuring it in this way, a sheet body having a predetermined static friction coefficient on each side is formed, so that the desired tackiness is stably exhibited.

The thickness of the stain prevention mat 1 is preferably 0.65 mm or less. This configuration reduces the effect on the temperature sensor that detects the temperature of the top plate 52, reducing the risk of malfunctions occurring when using an electromagnetic cooker. The thickness of the woven fabric 7, which is a sheet-like material, is preferably 0.02 mm or more and 0.42 mm or less. This configuration provides both cushioning and sufficient tear strength.

In the above embodiment, the stain-prevention mat is made of woven fabric and a coating material formed on both sides of the woven fabric, but it may be made of silicone only.

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

In addition, in the above 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 portion of the surface. If the stain prevention mat is made of silicone only and does not use woven fabric, the coating material may not be necessary.

In addition, in the above 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 is permeable to magnetic lines of force, but even if it is non-permeable above a certain thickness, it can be used in the same way as long as it can maintain permeability by reducing the thickness below the certain thickness.

Furthermore, in the above embodiment, the stain prevention mat is circular, but it may be other shapes such as rectangular or donut-shaped. If an opening is formed in the center, as in the donut-shaped case, it can be used as a stain prevention mat for a gas stove by placing it under the trivet of a gas stove other than an electromagnetic cooker. Therefore, in the present invention, even if it can be used as a stain prevention mat for a gas stove, it is included in the scope of the present invention as long as it can also be used as a stain prevention mat for an electromagnetic cooker.

In addition, in the above embodiment, the static friction coefficient is set to be different by changing the amount of coating material applied to the first and second surfaces, but the static friction coefficient may be set by other means. For example, different types of coating materials may be used, or a finishing process may be performed to change the static friction coefficient.

The present invention will be described in detail below with reference to examples, although the embodiments of the present invention are not limited to the examples.
(Preparation of Examples and Comparative Examples)
A silicone coating material was formed on both sides of a sheet material made of glass fiber with different coating amounts and coating thicknesses to prepare Examples 1 to 5 and Comparative Examples 1 and 3. Additionally, Comparative Example 2 was prepared in which only the second surface was replaced with a fluororesin.

The same glass fibers are used in all cases, and the composition is shown in Table 1 below.

それぞれのコート材の塗工量及び塗工厚みは後述する表２にて示す。尚、塗工量及び塗工厚みのいずれも乾燥後のものである。

The coating amount and coating thickness of each coating material are shown in Table 2. Note that both the coating amount and coating thickness are measured after drying.

The following equipment was also prepared:

Induction cooker: HT-J200HTF (Hitachi, Ltd.)
Frying pan: Product name: IH Ruby Excellence Frying Pan 21cm (product number: C62202) (Group Seven Japan Co., Ltd.)
Aluminum Yukihira pot: Product name: Light and durable hammered Yukihira pot, diameter 25 cm, weight 500 g (Hokuriku Aluminum Co., Ltd.)
(Measurement of static friction coefficient)
The static friction coefficients of the first and second surfaces of each of the examples and comparative examples were measured according to JIS P8147:2010. The size of the test piece was 5 cm x 7 cm. The contact surface was a cotton cloth (nominal number 3-1) of JIS L0803: white cloth (single fiber cloth) for color fastness test. The pulling speed was 100 mm/min.
(Measurement of coating thickness of coating material)
The coating thickness of the coating material on the first and second surfaces of each of the examples and comparative examples (also simply referred to as "thickness of the coating material") is the arithmetic average of the thickness values of the coating material obtained by observing the surface of the sheet body embedded in epoxy resin and polished so that the cross section of the sheet body is the observation surface with a scanning electron microscope (SEM), and measuring the thickness of the coating material on the first and second surfaces of the sheet body at 10 points at intervals of 200 μm in a direction perpendicular to the thickness of the coating material (i.e., a direction parallel to the woven glass fiber fabric as the material of the sheet). The device name and measurement conditions of the scanning electron microscope used when observing the cross section of the sheet body with a scanning electron microscope are as follows. In addition, as a pretreatment for observation with a scanning electron microscope, the sheet body to be observed was embedded in epoxy resin, mechanically polished, and then carbon deposition was performed.
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. Furthermore, these images obtained by the scanning electron microscope were analyzed under two-point distance measurement conditions using image analysis software (Mitani Corporation's WinRoof 2018).
(Test 1: Shaking a pot, etc. while cooking)
A stain-prevention mat (21 cm in diameter) of each Example and Comparative Example was laid on the top plate (glass top) of an electromagnetic range placed on a conveyor, and a frying pan was placed on the mat. With the frying pan fixed (i.e., with the frying pan placed on the stain-prevention mat laid on the glass top), the conveyor was moved horizontally for 200 mm at a speed of 200 mm/s, and an evaluation was made as to whether the stain-prevention mat peeled off from the top plate (Evaluation 1).

If it did not peel at all, it was marked with a ◎; if it barely peeled at all (less than 5 mm even if the whole piece moved, or less than 5 mm even if the edge was turned up), it was marked with a 〇; if it peeled off (more than 5 mm overall, or the edge was turned up more than 5 mm), it was marked with an ×.

The results of Tests 1 to 3 are shown in Table 2 below.
(Test 2)
With the stain prevention mat of each Example and Comparative Example placed between the top plate and an empty aluminum pot, the heat of an electromagnetic cooker was set to 13, and the movement of the aluminum pot was evaluated (Evaluation 2). If the aluminum pot did not move within 10 seconds, it was evaluated as ◯, and if it moved, it was evaluated as ×.
(Test 3)
The time required for ten evaluators to place the stain prevention mat (diameter 21 cm) of each Example and Comparative Example in the designated position on the top plate was measured. The arithmetic mean value was marked as ◯ when it was less than 5 seconds, and marked as × when it was 5 seconds or more (rating 3).
(result)
The configurations of the examples and comparative examples and the results of tests 1 to 3 are as follows.

表２を参照して、第一面と第二面の静摩擦係数の差が０．０８以上０．６０以下であれば、評価１～評価３がいずれも〇又は◎となり、調理時に鍋等と汚れ防止マットが共に動くことを防止し、電磁調理器による加熱時に鍋等が動くことを防止し、汚れ防止マットを所定位置へ設置することも容易となることが確認された。

Referring to Table 2, it was confirmed that if the difference in the static friction coefficient between the first surface and the second surface is 0.08 or more and 0.60 or less, all of the evaluations 1 to 3 will be ◯ or ◎, which means that the pot, etc. and the stain-prevention mat will be prevented from moving together during cooking, the pot, etc. will be prevented from moving when heated using an induction cooker, and the stain-prevention mat will be easily installed in the designated position.

Furthermore, by looking at Examples 2 to 5, it was confirmed that if the difference in the static friction coefficient between the first and second surfaces is 0.10 or more, the evaluation 1 is rated as ◎ in all cases, which is even more preferable.

Furthermore, it was confirmed that the results of evaluations 1 to 3 are favorable when the static friction coefficient of the first surface is 0.50 or more and 0.90 or less, and the static friction coefficient of the second surface is 0.30 or more and 0.71 or less.

Furthermore, it was confirmed that the results of evaluations 1 to 3 were favorable when the coating amount of the coating material formed on the first side was 13 g/ ^m2 or more and 500 g/ ^m2 or less in dry weight, and when the coating amount of the coating material formed on the second side was 5 g/ ^m2 or more and 60 g/ ^m2 or less in dry weight.

Furthermore, it was confirmed that the results of evaluations 1 to 3 are favorable when the coating thickness of the coating material formed on the first surface is 7 μm or more and 286.1 μm or less, and the coating thickness of the coating material formed on the second surface is 2 μm or more and 34.3 μm or less.

1: Stain-prevention mat 2: First surface 3: Second surface 7: Woven fabric 8: Coating material 51: Stain-prevention mat 52: Top plate 53: Pot 54: Bottom surface In addition, the same symbols in each figure indicate the same or corresponding parts.

Claims (12)

A stain prevention mat for an electromagnetic cooker, which is used by being sandwiched between a top plate of the electromagnetic cooker and a bottom surface of a pot heated by the electromagnetic cooker,
It is made of a heat-resistant sheet material that is permeable to magnetic lines of force,
When a surface of the sheet body that contacts the electromagnetic cooker is defined as a first surface, and a surface opposite to the first surface that contacts the bottom surface of the pot is defined as a second surface,
the static friction coefficient of the first surface is greater than the static friction coefficient of the second surface;
a difference between a static friction coefficient of the first surface and a static friction coefficient of the second surface is 0.08 or more and 0.60 or less;
The static friction coefficient of the first surface is 0.50 or more and 0.90 or less,
A stain-prevention mat for an induction cooker, wherein the static friction coefficient of the second surface is 0.30 or more and 0.71 or less . A stain prevention mat for an electromagnetic cooker, which is used by being sandwiched between a top plate of the electromagnetic cooker and a bottom surface of a pot heated by the electromagnetic cooker,
It is made of a heat-resistant sheet material that is permeable to magnetic lines of force,
When a surface of the sheet body that contacts the electromagnetic cooker is defined as a first surface, and a surface opposite to the first surface that contacts the bottom surface of the pot is defined as a second surface,
the static friction coefficient of the first surface is greater than the static friction coefficient of the second surface;
a difference between a static friction coefficient of the first surface and a static friction coefficient of the second surface is 0.08 or more and 0.60 or less;
A coating material is formed on both sides of the sheet body,
A stain-prevention mat for an induction cooker , wherein the coating material formed on the first surface side is thicker than the coating material formed on the second surface side . The static friction coefficient of the first surface is 0.50 or more and 0.90 or less,
3. The stain-preventing mat for an induction cooker according to claim 2 , wherein the static friction coefficient of the second surface is 0.30 or more and 0.71 or less. The sheet body is
A sheet-like fiber composed of heat-resistant fibers;
4. The stain-preventing mat for an electromagnetic cooker according to claim 1, further comprising a coating material having water impermeability, the coating material being formed on both sides of the sheet-like fiber. The coating amount of the coating material formed on the first surface is 13 g/m2 or ^more and 500 g/ ^m2 or less in dry weight,
The stain-prevention mat for an induction cooker according to claim 4 , wherein the coating amount of the coating material formed on the second surface is 5 g/ ^m2 or more and 60 g/m2 or ^less in dry weight. The coating thickness of the coating material formed on the first surface is 7 μm or more and 286.1 μm or less,
The stain-prevention mat for an induction cooker according to claim 4 , wherein the coating thickness of the coating material formed on the second surface is 2 μm or more and 34.3 μm or less. The stain-preventing mat for an electromagnetic cooker according to claim 4 , wherein the sheet-like fiber includes glass fiber. The stain-preventing mat for an electromagnetic cooker according to claim 5 , wherein the sheet-like fiber includes glass fiber. The stain-preventing mat for an electromagnetic cooker according to claim 6 , wherein the sheet-like fiber includes glass fiber. The stain-prevention mat for an electromagnetic cooker according to claim 4 , wherein the coating material includes silicone. The stain-prevention mat for an electromagnetic cooker according to claim 5 , wherein the coating material includes silicone. The stain-prevention mat for an electromagnetic cooker according to claim 6 , wherein the coating material includes silicone.

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