JP5732008B2 - Protective mat for induction cooker - Google Patents

Description

  The present invention relates to a protective mat for an electromagnetic cooker that protects a top plate of a stove type electromagnetic cooker.

  An electromagnetic cooker is a device that heats and cooks a metal container such as a pan using the principle of electromagnetic induction heating by a coil embedded therein, and is also called an IH cooker or the like. The electromagnetic cooker heats the material inside the container by self-heating of a metal container placed on a flat top plate made of tempered glass. Accordingly, the top plate itself does not generate heat, so that seizure hardly occurs, and the flat top plate is easy to clean.

  However, since the top plate is also heated by the metal container that has become high temperature and becomes high temperature, if dirt adheres to the top plate, it burns and adheres, and it takes time to clean. In addition, since the top plate is made of tempered glass, the top plate is scratched when moving the pan, an impact occurs when the pan is placed on the top plate, or the pan is against the flat top plate. There is a problem that the heating efficiency is lowered due to slipping and moving.

  On the other hand, Patent Document 1 proposes a protective sheet for an electromagnetic cooker for preventing the top plate from being soiled. This protective sheet is made of heat-resistant paper products that do not shield eddy currents, food packaging wrap films, glass fibers coated with fluororesin rubber, etc., and dirt adheres to the top plate by covering the top plate. Is to prevent.

  In addition, the antifouling sheet for an electromagnetic cooker proposed in Patent Document 2 is formed by coating the surface of a support such as paper or non-woven fabric with a predetermined resin, thereby preventing the sheet itself from being heated at a high temperature. Improvements are being made. Further, since the adhesive layer is provided on the back surface of the sheet, slipping off from the electromagnetic cooker is prevented.

Registered Utility Model No. 3111559 JP 2004-207121 A

  However, the conventional sheet has a problem in that when laying and cooking on a heat source of an electromagnetic cooker, the position of the sheet is shifted due to friction of the cooking utensil, a heating loss occurs, and an extra electricity bill is required. In addition, the displaced sheet has to be reset to the original position in accordance with the center of the heat source, which has been a stress during cooking.

  In the top plate of the electromagnetic cooker, the cookware and the top plate are prevented from being damaged by a cooking utensil such as a pan, adhesion of dirt, scorching due to heat, etc., and sliding of the utensil during cooking. The purpose is to give a comfortable cushion between.

This invention is made | formed in view of such a situation, The 1st coating layer and the 2nd coating layer which consist of the sheet-like base material which consists of glass fiber, and the silicone rubber each formed in both surfaces of this base material The first coating layer is made of silicone rubber applied at an application amount of 100 to 110 g / m ² , the surface unevenness thereof is 0.8 μm or more and 4 μm or less, and the average friction coefficient is 0.45 or more. It is a protective mat for an electromagnetic cooker.

  Here, “surface unevenness” is surface roughness measured by an automated surface tester (KES-FB4-AUTO-A) manufactured by Kato Tech Co., Ltd., and it can be said that the larger the numerical value, the larger the unevenness. Further, the “average friction coefficient” is a frictional force measured by an automated surface tester (KES-FB4-AUTO-A) manufactured by Kato Tech Co., Ltd., and it can be said that the larger the numerical value, the less slippery.

  By laying the protective mat for an electromagnetic cooker on the top plate, it is possible to prevent dirt from adhering to the top plate. Moreover, since the suitable uneven | corrugated shape is formed in the 1st coating layer provided in either surface of mat | matte, by laying on a top plate by making a 1st coating layer into a lower surface, the top plate of an electromagnetic cooker A moderately large frictional resistance is obtained between the first covering layer of the protective mat and the silicone rubber particles of the protective mat, so that the mat is prevented from shifting during cooking, and a comfortable work is possible.

In the protective mat for an electromagnetic cooker, the first coating layer preferably has a composite Young's modulus of 22 N / mm ² or more and 100 N / mm ² or less. In this case, since the surface of the mat has an appropriate hardness and the mat itself has an appropriate cushioning property, a contact sound and an impact sound during cooking are alleviated, and a comfortable work can be performed. Here, the “composite Young's modulus” is calculated based on a result measured by an ultra-fine indentation hardness tester (ENT-1100a) manufactured by ELIONIX Corporation.

  In this electromagnetic cooker protective mat, it is preferable that the second coating layer has the same surface asperity, average friction coefficient, and composite Young's modulus as the first coating layer. In this case, since it can be similarly used regardless of which of the first coating layer and the second coating layer is used, only one surface is hardly worn, and a comfortable work can be performed over a long period of time.

  According to the protective mat for an electromagnetic cooker of the present invention, it is possible to prevent damage caused by cooking utensils such as a pan, adhesion of dirt, scorching due to heat, etc., and prevention of slipping of utensils during cooking. Comfortable cushioning can be given between.

It is a top view which shows one Embodiment of the protection mat for electromagnetic cookers of this invention. It is a perspective view which shows the use condition of the protection mat for electromagnetic cookers in FIG. It is a fragmentary sectional view of the protection mat for electromagnetic cookers in FIG. It is a graph which shows the relationship between the indentation depth at the time of measuring the composite Young's modulus of the protection mat for electromagnetic cookers, and the magnitude | size of a load.

Hereinafter, an embodiment of a protective mat 10 for an electromagnetic cooker according to the present invention will be described. As shown in FIG. 1, the protective mat 10 for an electromagnetic cooker is formed in a substantially circular shape, and is laid on the top plate P of the electromagnetic cooker so as to come into contact with the lower surface of a cooking utensil C such as a pan or a frying pan. 2). As shown in FIG. 3, the protective mat 10 includes a sheet-like base material 11 made of glass fibers, and a first covering layer 12 and a second covering layer made of silicone rubber formed on both surfaces of the base material 11, respectively. 13 is laminated. The protective mat 10 has a thickness of 0.14 ± 0.02 mm and a weight of 210 ± 20 g / m ² .

The base material 11 uses glass fiber single yarn (JIS standard ECE225 1/0) for warp and weft, and the density is 60 ± 2/25 mm in length and 57 ± 2/25 mm in width (100 g / m ² ). A glass fiber fabric formed by plain weaving so as to have a thickness of 0.1 mm. The glass fiber fabric has excellent heat resistance and strength, and can withstand the high temperature of the heated cooking utensil C.

The 1st coating layer 12 and the 2nd coating layer 13 are formed by applying the heat-resistant silicone rubber to the surface of the base material 11, and drying twice. The amount of silicone rubber applied in this step is 100 to 110 g / m ² . The first covering layer 12 and the second covering layer 13 may be formed by mixing an aluminum paste into the silicone rubber. When aluminum paste is mixed, the first coating layer 12 and the second coating layer 13 can be formed in silver white.

The first coating layer 12 has a surface roughness of 0.8 μm to 4 μm, an average friction coefficient of 0.45 to 0.8, and a composite Young's modulus of 22 N / mm ^{2 to} 100 N / mm ² . The size of the surface unevenness is set in a range in which the protective mat 10 is not easily displaced on the top plate and the protective mat 10 is easily peeled off from the top plate. By setting the average friction coefficient to 0.45 or more, it is possible to prevent the protective mat 10 from being displaced on the top plate during the cooking operation. In addition, since the protective Young mat 10 has a suitable cushioning property when the composite Young's modulus is 22 N / mm ² or higher and 100 N / mm ² or lower, a cooking utensil such as a pan hits the top plate via the protective mat 10. In this case, an unpleasant impact sound can be reduced.

Here, the “composite Young's modulus” is calculated as follows based on a result measured by an ultra-fine indentation hardness tester (ENT-1100a) manufactured by ELIONIX Corporation. First, the test load set in the testing machine is F _max , and the maximum indentation depth of the indenter (displacement at the start of unloading) is h _max .

Next, the elastic deformation amount and the plastic deformation amount are obtained from the unloading graph (FIG. 4). Approximate from unloading start (h _max ) to 50% of the unloading curve by the least square method (quadratic curve), extend the tangent line (P = mδ + n) at F _max of the quadratic curve, and cross the displacement axis The coordinate obtained is “h1”, and the value obtained by subtracting h1 from h _max is “h2”.

Next, the composite Young's modulus E ^* is obtained from Equation 1.

Here, S is contact rigidity, C _A is a contact constant, and A _P (h) is a contact projected area, which is obtained from Equations 2, 3, and 4.

ただしα＝６５°

Where α = 65 °

Therefore, the composite Young's modulus E ^* is obtained from Equation 5.

  Examples 1 to 3 and Comparative Examples 1 to 4 of the protective mat for an electromagnetic cooker according to the present invention will be described below. The surface unevenness and the average friction coefficient were measured by an automated surface tester (KES-FB4-AUTO-A) manufactured by Kato Tech Co., Ltd. The composite Young's modulus was measured with an ultra-fine indentation hardness tester (ENT-1100a) manufactured by ELIONIX Corporation. Table 1 shows the measurement results of these surface properties. In Table 1, “front” refers to the second coating layer in contact with the frying pan, and “back” refers to the first coating layer in contact with the top plate.

(Examples 1-3)
About the protective mat for an electromagnetic cooker according to the present invention in which the first coating layer and the second coating layer are formed by applying silicone rubber on both surfaces of a glass fiber substrate having a thickness of 0.1 mm, the moving direction of the measuring element and the measurement The surface characteristics of the front and back surfaces were measured while changing the location. The protective mat of each example has a surface roughness and an average friction coefficient within the scope of the present invention.

(Comparative Examples 1-4)
About the protective mat for electromagnetic cookers formed by forming a silicone coating layer on both surfaces of a glass fiber substrate having a thickness of 0.1 mm, the surface characteristics of the front and back surfaces were measured in the same manner as in the examples. In the protective mat of the comparative example, either the surface unevenness or the average friction coefficient deviates from the scope of the present invention. In addition, Comparative Examples 3 and 4 are the results obtained by turning over Comparative Examples 1 and 2, respectively.

  For these examples and comparative examples, the anti-slip property of each protective mat against the top plate, the ease of shaking of the frying pan on each protective mat, the ease of peeling of each protective mat from the top plate, and the frying pan through each protective mat The ease of impact sound when hitting the top plate with the top plate and the absence of a foreign object feeling during cooking were evaluated. The results are shown in Table 1.

  The anti-slip property for the top plate was evaluated as “◯” when the mat had not moved from the installation place after cooking, and “x” when moved even a little. The ease of shaking of the frying pan was rated as “◯” when no resistance was felt due to the mat wearing when the pan was shaken, and “x” when resistance was felt. The ease of peeling from the top plate was evaluated as “◯” when it was easily peeled off with a force that can be lifted lightly with an index finger and thumb, and “X” when more force was required. The ease of impact sound was rated as ◯ when it felt that the ticking sound caused by the impact was alleviated as compared with the case where no mat was laid, and × when it felt that it was not relaxed. There is no sense of foreign material when cooking, when cooking with a mat spread, when there is no sensation of foreign material, or when there is a clear sensation of foreign material X.

  From this comparative experiment, it was confirmed that when the surface irregularity of the coating layer formed of silicone rubber was 0.8 μm or more and 4 μm or less, the protective mat was not easily displaced from the top plate and was easily peeled off from the top plate. On the other hand, when the surface irregularities were smaller than 0.8 μm, it was difficult to peel the protective mat from the top plate, and when the surface irregularities were larger than 4 μm, it was confirmed that cooking was difficult because the protective mat was easily displaced from the top plate.

  Further, it was confirmed that when the average friction coefficient of the coating layer was 0.45 or more, the protective mat was not easily displaced with respect to the top plate, but when it was smaller than 0.45, it was easily displaced with respect to the top plate.

Further, impact sound is generated by insufficient cushioning composite Young's modulus is greater than 100 N / mm ^2, uncomfortable as laid foreign matter during cooking smaller than 22N / mm ^2, comfortable It became an obstacle to cooking.

As described above, according to the protective mat for an electromagnetic cooker of the present invention, it is possible to prevent damage caused by cooking utensils such as a pan, adhesion of dirt, scorching due to heat, etc., and prevention of appliance slipping during cooking. Comfortable cushioning can be provided between the cooking utensil and the top plate.
In addition, this invention is not limited to the thing of the structure of the said embodiment, In a detailed structure, it is possible to add a various change in the range which does not deviate from the meaning of this invention.

DESCRIPTION OF SYMBOLS 10 Protection mat | matte 11 for electromagnetic cookers Base material 12 1st coating layer 13 2nd coating layer C Cooking utensil P Top plate

Claims (4)

It has the sheet-like base material which consists of glass fiber, and the 1st coating layer and the 2nd coating layer which were each formed in both surfaces of this base material, The said 1st coating layer is an application quantity of 100-110 g / m < ² >. A protective mat for an electromagnetic cooker, characterized in that the surface irregularity is 0.8 μm or more and 4 μm or less and the average friction coefficient is 0.45 or more. Before Stories second coating layer, the electromagnetic cooker protective mat according to claim 1, characterized in that it consists of silicone rubber. The protective mat for an electromagnetic cooker according to claim 1 or 2, wherein the first coating layer has a composite Young's modulus of 22 N / mm ² or more and 100 N / mm ² or less.   The said 2nd coating layer has the surface unevenness | corrugation, friction coefficient, and composite Young's modulus equivalent to a said 1st coating layer, The protective mat for electromagnetic cookers of Claim 3 characterized by the above-mentioned.

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