TW201838569A - Heat-generating sheet for ih cooker - Google Patents

Abstract

The present invention provides a heat-generating sheet for an IH cooker which has an electrically conductive sheet 3, a silicone sheet 5 laminated on one surface of the electrically conductive sheet 3 and a coating layer 6 formed on the other surface of the electrically conductive sheet 3, wherein both of the silicone sheet 5 and the coating layer 6 contain a radiation material.

Description

Heating sheet for induction heating cooker

The present invention relates to a heating sheet for an induction heating cooker, which is used for heating conditioning in the induction heating cooker.

A heating cooker called an electromagnetic cooker has been widely used instead of a gas stove. This electromagnetic cooking device is also called an induction heating cooking device (IH cooking device), which generates a high-frequency magnetic field by an electromagnetic induction heating coil provided inside, and is induced by a cooking container placed on the cooking device. The Joule heat generated by the eddy current heats the food or water contained in the cooking container. In this way, the electromagnetic cooker can be cooked without heating, so the safety is high. In addition, because it is easy to wipe dirt, it has excellent cleanability and is economically superior to conventional heating cookers.

However, the electromagnetic cooker is limited in terms of the cooking appliances that can be used in principle. It is necessary to use a special appliance made of a magnetic material typified by iron. Therefore, many cooking appliances or cooking containers made of materials other than non-magnetic materials have recently been proposed, and have been put into practical use. For example, Patent Document 1 discloses a heating cooker for an induction heating cooker in which a heat generating sheet made of a metal foil such as aluminum foil is mounted in a plastic container. In this heat-generating sheet, there is also proposed a laminated heat-generating sheet in which a layer of a thermoplastic resin such as an olefin-based resin is laminated on a metal foil such as an aluminum foil.

Since the heat-generating sheet is only placed on the bottom of the plastic container, it does not fix it. Therefore, during heat conditioning (stewing), there may be problems such as movement of the heat-generating sheet. Therefore, the heat generating sheet is used in a state of being fixed to the bottom of the inside of the plastic container by heat sealing. Therefore, the layer of the thermoplastic resin superimposed on the metal foil must have heat sealability against the bottom of the plastic container.

In addition, as the aforementioned heating sheet must be fixed to the bottom of the container, it is not suitable for disposable applications. In addition, since the manufacturing steps must be fixed to the bottom of the plastic container, there is a problem that it is not easy to manufacture at low cost.

The applicant of the present invention further develops the function of the aforementioned heat generating sheet, and previously proposed a heat generating sheet for an induction heating cooker composed of a laminated sheet of "a conductive sheet (metal foil) and a resin sheet formed of an olefin resin, etc." And this heating sheet has obtained a Japanese patent (Patent Document 2). This heating sheet can be folded into a container shape, and a container (heating container) formed by folding the heating sheet is inserted into a container-shaped thermoplastic resin holder, and water or stewed ingredients are placed in the container. In this state, the inside of the heating container is subjected to heating conditioning by the induction heating cooker.

Like the aforementioned heat-generating sheet, the thermoplastic resin holder is not fixed to the container shape by heat sealing, and has the advantage of being suitable for disposable use. As described above, a container suitable for heating and conditioning such as stewing is formed by folding the heating sheet, and it is placed in an induction heating section of an induction heating cooker, and heating and conditioning are performed by induction heating.

In addition, this heat-generating sheet has a certain degree of heat resistance. However, for example, in the case of conditioning at high temperature such as the cooking of cooking oil such as fried oil, a resin sheet having higher heat resistance must be provided on one side of the metal foil. Therefore, in order to impart high heat resistance to the heat-generating sheet, the applicant of the present invention has proposed a heat-resistant laminated sheet used as a heat-generating sheet for an induction heating cooker. The thickness of the conductive sheet and one side of the conductive sheet is 20 μm or more. The silicone resin layer is composed of a silicone resin sheet and a silicone resin coating layer. The silicone resin coating layer is formed on the conductive sheet side, and the heat-resistant laminated sheet has also been obtained. Patent (Patent Document 3).

However, a container (sometimes referred to as a folded heating container) formed by folding a heating element as described above is held in a thermoplastic resin holder placed on an induction heating portion of an induction heating cooker, and heating is performed for frying conditions and the like. During the conditioning, there is a problem that the ingredients are locally burnt due to the direct heat transfer caused by the conductive sheet. In addition, a sensor provided in the induction heating section of the induction heating cooker senses the temperature rise caused by the heating of the conductive sheet, and automatically stops or controls the energization of the induction heating cooker when the temperature rises excessively. As a result, the problem of temperature control is not easy. [Prior Art Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2014-239852 Patent Document 2: Japanese Patent No. 5788557 Patent Document 3: Japanese Patent No. 5989846

[Problems to be solved by the invention]

Therefore, an object of the present invention is to provide a heating sheet for an induction heating cooker, which includes a conductive sheet that generates heat by induction heating, uses the heat generated by the conductive sheet to perform heating conditioning, and is effective when performing heating conditioning such as fried object conditioning. It can prevent local scorching of ingredients and is suitable for temperature control of induction heating cookers. [Method of Solving Problems]

According to the present invention, there is provided a heating sheet for an induction heating cooker, which is characterized by having a conductive sheet, and one side of the conductive sheet is laminated with a silicone resin sheet and the other side is formed with a coating layer. Contains heat radiating material.

Among the heat generating sheets for induction heating cookers of the present invention, it is preferable that: (1) the aforementioned paint layer is a silicone resin paint layer; (2) the aforementioned heat radiation material is a black pigment; (3) the aforementioned black pigment is a carbon pigment; the degree of heat radiation emission lines (4) to the silicone sheet and the paint layer to be the use of an induction heating cooker in the heat generating sheet of the paint layer 5μm wavelength side of 300 ℃ 380W‧m ^{- 2} ‧μm ^{- 1} above; (5) The surface of the silicone resin sheet on the opposite side to the conductive sheet is affixed with a reinforcing dielectric having a higher strength than the silicone resin sheet so that a part of the surface of the silicone resin sheet is exposed. Quality film. [Effect of Invention]

According to the heat-generating sheet for an induction heating cooker of the present invention, when the heat-generating sheet for the induction heating cooker is placed on the induction heating cooker, and heating and conditioning of the ingredients on the heat-generating sheet are performed, the heat of the heat radiator is radiated Helps to heat ingredients. Thereby, the local heating of the food material caused by the direct heat transfer of the conductive sheet is relieved, and the local burning of the food material can be effectively avoided. When the heating conditioning is performed, the temperature rise caused by the heat generation of the conductive sheet is relaxed by the heat radiation from the heat radiator. Therefore, it is suitable for temperature control performed by a sensor provided in an induction heating section of an induction heating cooker.

[Best mode for carrying out the invention]

As shown in FIGS. 1 to 3, the heating sheet for the induction heating cooker of the present invention (indicated by the element symbol 1 as a whole, and hereinafter referred to as a heating sheet) has a conductive sheet 3 as a heating element by induction heating. One side of the conductive sheet 3 is laminated with a silicone resin sheet 5, and the other side of the conductive sheet 3 is formed with a coating layer 6, and all of them have a heat radiation material. A reinforcing dielectric sheet 7 is attached to the surface of the silicone resin sheet 5 on the side opposite to the conductive sheet 3. As shown in FIG. 5 to be described later, the heating sheet 1 is folded into the form of a container A with a reinforcing dielectric sheet 7 as an outer side, and is placed in an induction heating state while being placed on a dielectric holding member 30. Induction heating section of a cooking appliance.

The conductive sheet 3 is formed of a metal foil typified by an aluminum foil or the like. When this heat-generating sheet 1 is placed on the induction heating section of an induction heating cooker with the silicone resin sheet 5 as the lower side, and the induction heating cooker is operated, the induced eddy current caused by the high-frequency magnetic field causes The conductive sheet 3 is heated.

In addition, the silicone resin sheet 5 is a dielectric having excellent heat resistance, and is formed to prevent direct contact between the conductive sheet 3 and an induction heating cooker, and to achieve proper heating of the conductive sheet 3. This silicone resin sheet 5 uses, for example, a silicone resin primer composed of a liquid silicone resin or the like containing acrylic alkoxysilane or other alkoxysilane as a monomer component, and the silicone rubber is adhered to The conductive sheet 3 or the reinforcing dielectric sheet 7 described later is formed by laminating and integrating a silicone rubber and a silicone primer.

As described above, the silicone resin sheet 5 formed by laminating and integrating the silicone rubber and the silicone primer is integrated as long as it has a thickness of 20 μm or more, preferably 20 to 1000 μm, and more preferably 50 to 200 μm. . The thickness of the silicone resin primer 5 applied to the conductive sheet 3 or the reinforcing dielectric sheet 7 in the silicone resin sheet 5 is different depending on the size of the heating sheet 1 and the like. The dry film thickness is about 0.05 to 2.0 μm.

In the present invention, since the siloxane resin sheet 5 is dispersed with a heat radiation material, the temperature rise of the conductive sheet 3 is reduced when the conductive sheet 3 generates heat. Therefore, it is suitable for temperature control performed by a sensor provided in an induction heating section of an induction heating cooker.

In addition, the coating layer 6 is dispersed with a heat radiation material, which is used to make the heat radiation of the heat radiator help the heating of the food material when the conductive sheet 3 generates heat, thereby reducing the local heating of the food material formed by the direct heat transfer of the conductive sheet 3. In this way, the coating layer 6 is preferably formed of a silicone resin coating material from the viewpoint of adhesion to the conductive sheet 3 or heat resistance. This siloxane resin coating is a coating material containing a liquid siloxane resin similar to the aforementioned siloxane resin primer in terms of a vehicle, and is a coating material that forms a siloxane resin coating film. The thickness of the coating layer 6 in which the heat radiation material is dispersed in this manner usually falls within a range of 1 to 50 μm. When the thickness is too thin, the food material formed by heat radiation is not heated sufficiently and burnt easily occurs. When the thickness is too thick, the coating layer 6 may be easily peeled from the heat generating sheet 1.

The heat radiation material blended into the silicone resin sheet 5 and the coating layer 6 is not particularly limited, but it is preferable to use a known black pigment such as a carbon-based black pigment or an oxide-based black pigment. For example, carbon black pigments include carbon black, lamp smoke, plant-based black pigments, bone black, graphite, and the like, and oxide black pigments include magnetite, copper-chromium composite oxide, Copper-chromium-zinc composite oxides. In the present invention, particularly from the viewpoint of use in food applications, a carbon-based black pigment is preferably used, and carbon black is particularly preferably used.

The amount of the heat radiating material incorporated into the siloxane resin sheet 5 as described above should preferably be set to alleviate the temperature rise caused by the heat generation of the conductive sheet 3 of the heat generating sheet 1. In addition, the amount of the heat radiation material blended into the coating layer 6 should be set so that the heat radiation of the heat radiator can help the heating of the food materials, thereby effectively reducing the local heating of the food materials formed by the direct heat transfer of the conductive sheet 3. .

FIG. 7 shows the distribution of the black body heat radiation flux on the side of the coating layer 6 of the heating sheet 1 at 300 ° C., and shows the temperature of the heating sheet 1 at 300 ° C. for the heating sheet 1 formed using the silicone resin sheet 5 and the coating layer 6 described above. The distribution of thermal radiation emissivity (heat radiation flux per unit area). Thereby to be seen in FIG. 300 ℃, 5μm wavelength of the thermal radiation emitted based 380W‧m ^{- 2} ‧μm ^- at least ^one embodiment of the blending amount of black pigment (carbon black), thereby preventing partial burning ingredients. In addition, in FIG. 7, the thermal radiation emissivity of the black body is a theoretical value obtained by the following formula in accordance with Planck's law of thermal radiation. E (λ, T) = (2πc ² / λ ⁵ ) / (e ^{hc / λkT} -1) In the formula, E: energy density (W / m ² ‧ μm) T: temperature of black body (Kelvin [K] ) λ: wavelength (m) h: Planck constant ^{(6.625 × 10 - 34 [J} / s]) k: Boltzmann's constant ^{(1.38 × 10 - 23 [J} / K]) c: speed of light (2.9979 × 10 ⁸ [m / s])

Moreover, in the present invention, the conductive sheet 3 is formed with various forms of cutting lines X1, X2, and X3 for adjusting the eddy current induced by induction heating formed by the operation of the induction heating cooker. That is, these cutting lines are formed in a line shape so as to completely cut through the eddy current induced in the conductive sheet 3 and penetrate the conductive sheet 3 and leave the silicone resin sheet 5 (see FIGS. 1 and 2). The cutting line is formed by a known method such as laser processing.

This heating sheet 1 is generally circular as a whole, but can be formed into a container A in the following form by folding: the conductive sheet 3 side is set as the inner surface, the central circular area is set as the bottom 10, and An annular region at the periphery is defined as a peripheral side wall portion 13 (see FIG. 5 to be described later). That is, the size of the container A thus formed is generally the same as that of the pot used for home cooking.

In the container formed by folding, the conductive sheet 3 of the portion (annular area) that becomes the peripheral side wall portion 13 is formed with a plurality of strips at equal intervals, and the portion that becomes the center O of the bottom portion 10 (central circular area) is used as a starting point The first cutting line X1 extends in a radial pattern (refer to FIG. 2). The first cutting line X1 can be used to reduce or block the induction of the eddy current flowing through the conductive sheet 3 of the peripheral side wall portion 13 of the container formed by folding, and to prevent excessive heating of the peripheral side wall portion 13 . Thereby, heat conditioning (stewing) can be performed at an appropriate temperature, and further, damage caused by heating of the dielectric holding member 30 (see FIGS. 5 and 6 described later) in contact with the peripheral side wall portion 13 can be effectively prevented.

In this way, as long as the first cutting line X1 is appropriately selected, the number of eddy currents induced by the high-frequency magnetic field can be reduced or interrupted in accordance with the size of the container formed by folding, and can be interrupted during heating and conditioning. Generally speaking, more than 2 items should be used, and 3 to 40 items should be used. In addition, in FIG. 2, the first cutting line X1 extends in a radial shape, but as long as the eddy current can be reduced or blocked, it may be formed in a curved shape or other shapes.

Further, as shown in FIG. 2, in a region of the bottom 10 of the container thus formed, a plurality of concentric second cutting lines X2 having the bottom center O as a center is preferably formed. That is, this cutting line X2 intercepts the eddy current flowing in the conductive sheet 3 equivalent to the bottom 10 of the container A formed by folding in each area to prevent excessive heating of the bottom 10, so stew at an appropriate temperature It is effective for heat conditioning such as cooking. In this way, the number of the second cutting lines X2 is not particularly limited, but generally a plurality of the second cutting lines X2 are sufficient.

Furthermore, as shown in FIG. 2, a third cutting line X3 extending toward the minimum diameter cutting line of the second cutting line X2 is formed in a region surrounded by the minimum diameter cutting line of the second cutting line X2. That is, the third cutting line X3 reduces or interrupts the eddy current induced in the center portion of the bottom portion 10, thereby effectively preventing bumping caused by local heating of the center portion of the bottom portion 10 during heating conditioning (stewing). . In this way, the third cutting line X3 only needs to extend in a direction that reduces or blocks the induced eddy current, that is, the minimum diameter cutting line of the second cutting line X2. For example, although it is formed in an arc shape in FIG. 2, it may also be formed in a linear shape, and the number thereof is not limited.

Moreover, the first cutting line X1 is not in contact with the maximum diameter cutting line of the second cutting line X2, and the second cutting line X2 may be formed into an end shape, that is, an arc shape. Furthermore, the third cutting line X3 is not in contact with第二 切线 X2. The second cutting line X2. Such a pattern is particularly advantageous in that breakage of the silicone resin sheet 5 generated when the cutting line is formed can be reliably prevented.

If specified, the first cutting line X1 does not extend to the position of the maximum diameter cutting line of the second cutting line X2, and there is a gap between the end X1a of the first cutting line X1 and the maximum diameter cutting line of the second cutting line X2. Clearance (α). In addition, the maximum diameter cutting line of the second cutting line X2 is not completely endless, and ends X2a and X2a are formed in a partially arc shape, and a distance α exists between the ends. Similarly, the third cutting line X3 does not extend to the position of the minimum diameter cutting line of the second cutting line X2, and there is a distance α between the end X3a of the third cutting line X3 and the minimum diameter cutting line of the second cutting line X2. That is, the cutting lines X1 to X3 passing through the conductive sheet 3 are formed by laser irradiation (laser processing). In these parts where the cutting lines are in contact with each other, the laser processing is repeated, so the following disadvantages are likely to occur: The heat caused by the object to be heated (conductive sheet: metal foil such as aluminum foil) will cause the substrate to be damaged in this part. The silicone resin sheet 5 is damaged or has holes. This situation is also the same as in the case where the line is formed into a completely circular (endless) shape like the second cutting line X2. This is because laser processing is repeated at the terminal portion of a line formed by laser processing in order to make it completely endless.

However, in the aspect of FIG. 2, the first to third cutting lines X1 to X3 are not in contact with each other, and a fixed interval α is formed therebetween. In addition, the second cutting line X2 is also partially missing, and a distance α is formed. Thereby, excessive heating caused by repeated laser processing can be prevented, and damage to the silicone resin sheet 5 caused by laser processing can be effectively prevented.

Regarding the distance α as described above, if the distance α is increased, the above-mentioned effects formed by the cutting lines X1 to X3 are reduced. Therefore, the distance α should be set to an appropriate size, and generally, it should be set to about 0.5 to 1.0 mm.

In addition, among the largest diameter cutting line distances α of the second cutting line X2, a short leakage prevention cutting line Y is formed outward from the extension line of the cutting line. Thereby, it is possible to further suppress a reduction in eddy current (leakage to the outer periphery) or a reduction in blocking effect in the cutting line with the largest diameter. On the other hand, among the smallest-diameter cutting line distances α of the second cutting line X2, a short leakage prevention cutting line Y is formed inward from the extension line of the cutting line. This can reduce or interrupt the eddy current induced in the smallest diameter cutting line, and further effectively prevent bumping caused by local heating of the central part during heating conditioning (stewing). In addition, the length of the leakage prevention cutting line Y should be set to about 0.5 to 2.0 mm from the extension line of the cutting line.

Among the heat-generating sheets 1 having the basic structure as described above, as shown in FIG. 1, the present invention is preferable to attach a reinforcing dielectric sheet 7 on the surface of the silicone resin sheet 5 (the surface opposite to the conductive sheet 3). . That is, in the case where the heat generating sheet 1 is formed by the two-layer structure of the conductive sheet 3 and the silicone resin sheet 5 described above, when the container A formed by folding it is put into food or the like, the container occasionally A bad condition occurred. For example, as shown in FIG. 6, when the container A formed by folding the heating sheet 1 is placed in the holding member 30 and the ingredients are placed therein, and the heating conditioning is performed by an induction heating cooker, the following situations may occur: the container cannot be made A is built along the shape of the holding member 30, or it cannot be built into a stable state, and it is not easy to heat and adjust. However, in the present invention, the silicone resin sheet 5 is provided with a reinforcing dielectric sheet 7 on its surface. Therefore, the container A having a stable shape can be formed by folding the reinforcing dielectric sheet 7 as an outer side. That is, when the container A is formed by wave-like folding or the like, a reinforcing dielectric sheet 7 (a plurality of projecting pieces 23 to be described later) is present in each of the wave surfaces adjacent to each other. Thereby, the form of the said container A is stably maintained.

Therefore, according to the present invention, in the case where the container A formed by folding is placed in the holding member 30 and the food is placed therein, and the heating is adjusted by the induction heating cooker, the container A is moved along the holding member 30 Shape, or built into a stable state. Thereby, the heating conditioning performed by the induction heating cooker can be stably performed.

The reinforcing dielectric sheet 7 is formed of a material that is not energized in the same manner as the silicone resin sheet 5 and has a strength greater than that of the silicone resin sheet 5. When the reinforcing dielectric sheet 7 is formed of a material having a lower strength than the silicone resin sheet 5, the reinforcing effect is insufficient, and the form A of the container A formed by folding is insufficient. Therefore, the reinforcing dielectric sheet 7 is formed of a high-strength material that is not energized, and may be formed of a polyester resin such as PET or PEN depending on the strength of the silicone resin sheet 5. It is most suitable for paper.

The dielectric sheet 7 for reinforcement is placed between the conductive sheet 3 and the induction heating cooker when the container A formed by folding the heating sheet 1 is placed on the induction heating cooker. Therefore, the reinforcing dielectric sheet 7 must not hinder the heat generation of the conductive sheet 3 formed by the induction heating cooker 7 (or stop the heat generation when the sensor is overheated, etc.), and it must not hinder the folding into the shape of the container. . Therefore, the thickness of the reinforcing dielectric sheet 7 is, for example, about 0.1 to 5 mm, and at the same time, the entire surface of the silicone resin sheet 5 does not need to be covered, and a part thereof is exposed as shown in FIG. 3.

For example, as shown in FIG. 3, the reinforcing dielectric sheet 7 is composed of a ring-shaped base 21 and a plurality of projections 23 extending radially outside the ring-shaped base 21, and is attached to this form The back surface of the silicone resin sheet 5 (the surface opposite to the conductive sheet 3). When the annular base portion 21 is folded to form the container A (refer to FIGS. 5 and 6), the bottom portion 10 of the container A is divided, and a plurality of protruding pieces 23 are located corresponding to the side wall portion 13 of the container A. Partly, it extends radially with the center O (equivalent to the center of the bottom 10) as a starting point, but it is not formed inside the annular base 21.

As can be understood from FIG. 3, a surface of the silicone resin sheet 5 is exposed in a region surrounded by the annular base 21. Thereby, when the container A is placed on the induction heating cooker, the conductive sheet 3 is heated by the operation of the induction heating cooker through the silicone resin sheet 5. In addition, during heating conditioning, when the bottom 10 of the container A becomes abnormally high, a sensor provided in the induction heating cooker detects it and stops the activity of the induction heating cooker.

Further, a plurality of protruding pieces 23 of the reinforcing dielectric sheet 7 located at a portion corresponding to the side wall portion 13 of the container A (that is, outside of the annular base portion 21) are provided at intervals from each other. As a result, as shown in FIG. 5 (b), when the container A is formed by folding by wave-like folding or the like, there are protruding pieces 23 on each side of the wave-folded side wall portion 13. In addition, the shape of the container A formed by the heat generating sheet 1 can be stably maintained by overlapping adjacent projecting pieces 23 on each other. In addition, when the plurality of protruding pieces 23 of the reinforcing dielectric sheet 7 are connected to each other, it is not easy to fold into the shape of the container A. Therefore, it is important to provide the same as in the case where a space is provided.

The number of the protruding pieces 23 of the reinforcing dielectric sheet 7 is determined in consideration of ease of folding into the container A and shape retention. For example, when the number of the protruding pieces 23 is too large, the interval between the adjacent protruding pieces 23 becomes narrow, so that it is difficult to fold into the shape of the container A. Conversely, when the number of the protruding pieces 23 is too small, the reinforcing effect may become thinner and the shape retention may be impaired. The specific number of the protruding pieces 23 varies depending on the size of the container A (the size of the heating sheet 1) formed by folding, and the like cannot be uniformly defined. When the degree is large, it is usually about 9 to 27 pieces.

Furthermore, in order to make the shape retention of the container A stronger, the number of the protruding pieces 23 should be set to an odd number (in the example of FIG. 3, the number of protruding pieces 23 is 19). That is, when a virtual straight line L extending in the diameter direction through the center O is assumed as shown in FIG. 3, when the number of the protruding pieces 23 is set to an even number, the straight line L will not contact the protruding pieces 23. While extending. On the other hand, when the number of the protruding pieces 23 is set to be an odd number, the virtual straight line L must be in contact with the protruding pieces 23. As can be understood from this, in a case where the number of the protruding pieces 23 is an even number, using this virtual straight line L as a broken line, the laminated heating sheet 1 can be easily cut in half. Therefore, such a broken line is occasionally formed before the heat conditioning, and as a result, the shape retention of the container A is reduced. On the other hand, when the number of the protruding pieces 23 is set to an odd number, the virtual straight line L contacts the protruding pieces 23 as shown in FIG. 3. The protruding piece 23 can serve as a resistance to prevent the formation of the fold line formed by the virtual straight line L, and can further improve the shape retention of the container A.

In the present invention, it is preferable that the protruding piece 23 as described above has an appropriate distance D from the annular base portion 21 and is set to an interval of about 1.0 to 20 mm. When the interval D is too small, it is likely to occur when the reinforcing dielectric sheet 7 is produced by punching or the like, or when the reinforcing dielectric sheet 7 is attached to the surface of the silicone resin sheet 5. Damage or deformation. When the interval D is too large, the reinforcing effect may be reduced by buckling of the heat generating sheet 1 or the like.

From the viewpoint of the ease of folding of the heat generating sheet 1, it is preferable that the projecting piece 23 is not connected to the outer peripheral edge of the annular base portion 21. However, when all the projecting pieces 23 are separated from the annular base portion 21, this is strengthened. When the dielectric sheet 7 is attached to the surface of the silicone resin sheet 5, the annular base 21 and the plurality of protruding pieces 23 must be attached separately in a dispersed state. Therefore, a structure in which a part of the protruding pieces 23 are connected to the annular base portion 21 by the thin connecting portion 25 is preferable. With this structure, the projection piece 23 and the annular base portion 21 can be attached to the silicone resin sheet 5 as a whole without impairing the ease of folding the heating sheet 1 to the container A and the shape retention of the container A. surface. In the example of FIG. 3, three of the 19 tabs are connected to the annular base 21.

In addition, in the case where the reinforcing dielectric sheet 7 is attached to the surface of the silicone resin sheet 5, an appropriate bonding agent can be used depending on the material, which is generally the same as the adhesion of the silicone resin sheet 5 to the conductive sheet 3. Silicone resin primer (hardening silicone resin, especially oligomer of acrylic silicone resin) should be used as a bonding agent for integration.

In the present invention, for the heat-generating sheet 1 described above, for example, a blank sheet B for forming a reinforcing dielectric sheet 7 in the form shown in FIG. 4 can be prepared in advance, and the blank sheet B can be used. And easy to manufacture. As shown in FIG. 4, this blank sheet B is formed by punching a dielectric sheet such as paper, and the punched-out portion 27 corresponds to the silicone resin sheet exposed when the strong dielectric sheet 7 is attached. 5 of the surface portion. In the blank sheet B in this form, the outer end portion of the protruding piece 23 is held connected to the peripheral edge portion 29, and the annular base portion 21 is held connected to a part of the protruding piece 23 by the connecting portion 25. That is, a long dielectric sheet is die-cut, and a plurality of die-cut portions 27 as described above are formed in a row to form a blank sheet B in advance.

Furthermore, while winding the long conductive sheet with a roller, one side is appropriately coated with a bonding agent (such as a silicone primer), and the other side is coated with a paint (black pigment) containing a heat radiation material (black pigment). Paint), and a long silicone sheet (such as a silicone rubber sheet) is laminated on the adhesive surface. The blank sheet B was continuously adhered to the silicone resin sheet surface of the long laminate thus produced. In this case, a bonding agent such as a silicone resin primer is appropriately applied to the adhesive surface of the blank sheet B in advance. The long laminated body to which the blank sheet B was attached was obtained as described above, and was crimped under appropriate heating, so that the silicone resin sheet and the blank sheet B were firmly joined. Finally, by cutting to a predetermined size, a target heat generating sheet 1 can be obtained.

In addition, as in the heat-generating sheet 1 produced as described above, it is desirable to reduce the adhesion force of the exposed surface portion of the silicone resin sheet 5 of the die-cut portion 27 in advance. When this surface part is sticky, it is difficult to fold the heat generating sheet 1 into a container A, or the heat generating sheets 1 may be bonded to each other when the heat generating sheets 1 are stacked, which may cause obstacles to their storage or sale. Such a reduction in adhesive force can be performed, for example, by a roughening treatment such as a sandblasting treatment or a pressure bonding of a roughened roller. In addition, an anti-blocking agent such as silicon dioxide particles may be blended into the siloxane resin sheet 5 in advance to reduce the adhesion.

5 and 6, the laminated heat generating sheet 1 is folded into a container A (see FIG. 5 (b)), and placed in a dielectric holding member 30 shown in FIG. 5 (a), for example. In this state, it is used by being placed in an induction heating section of an induction heating cooker.

In the present invention, the holding member 30 is formed of a dielectric material similarly to the silicone resin sheet 5 or the reinforcing dielectric sheet 7. In particular, from the viewpoints of moldability and the like, it is preferably formed of a thermoplastic resin, particularly preferably an olefin-based resin, and most preferably formed of polypropylene.

As shown in FIG. 5 (a) and FIG. 6, the holding member 30 is formed by an annular wall 31. The annular wall has a pushing shape with a larger diameter at the upper end and a smaller diameter as it goes downward. A peripheral inner flange 33 protruding inward is formed at the lower end of the annular wall 31, and a handle 34 is formed at the upper end of the annular wall 31.

The container A formed by the heat generating sheet 1 of the present invention is housed inside the annular wall 31 of the holding member 30 as described above, and is subjected to heating conditioning by an induction heating cooker in a stable state. The annular wall 31 is set to a size that can accommodate the container A inside.

As shown in FIG. 6 in particular, the container A formed by folding the heat generating sheet 1 inserts the heat generating sheet 1 into the inside of the annular wall 31 of the holding member 30 to make the protruding piece of the dielectric sheet 7 for reinforcement. 23 is erected from the annular base 21. As a result, a container A formed by folding a heating sheet 1 composed of a conductive sheet 3, a silicone resin sheet 5, and a reinforcing dielectric sheet 7 is formed inside the annular wall 31 of the holding member 30 and Contain. Next, the heat medium or the foodstuff 50 is put into the container A, and the heating conditioning by the induction heating cooker is performed in this state.

The shape of the heat generating sheet 1 of the present invention has been described above as a circle, but as long as it can be folded into a container, this shape can also be rectangular, and the annular base 21 of the dielectric sheet 7 for reinforcement, or The shape of the endless second cutting line X2 formed by the conductive sheet 3 may be rectangular. The planar shape of the annular wall 31 of the holding member 30 may be rectangular.

1‧‧‧ fever film

3‧‧‧ conductive sheet

5‧‧‧silicone resin sheet

6‧‧‧ Coating layer

7‧‧‧ Strengthening dielectric sheet

10‧‧‧ bottom

13‧‧‧Circular side wall

21‧‧‧ ring base

23‧‧‧ protrusion

25‧‧‧Connection Department

27‧‧‧Die cutting department

29‧‧‧periphery

30‧‧‧ holding member

31‧‧‧ ring wall

33‧‧‧ weekly inner flange

34‧‧‧handle

35‧‧‧ Zhou segment difference

50‧‧‧ ingredients

A‧‧‧container

B‧‧‧ Blank

X1‧‧‧first cutting line

X2‧‧‧Second cutting line

X3‧‧‧third cutting line

Y‧‧‧Leak prevention cutting line

α‧‧‧ pitch

FIG. 1 is a schematic view showing a cross-sectional structure of a heating sheet for an induction heating cooker according to the present invention. FIG. 2 is a plan view of the heat generating sheet of FIG. 1. FIG. 3 is a bottom view of the heat generating sheet of FIG. 1. FIG. 4 is a plan view showing a blank sheet used for attaching the dielectric sheet for reinforcing the heat generating sheet of FIG. 1. 5 (a) and 5 (b) are half perspective views of a holding member on which the heat generating sheet of Fig. 1 is placed. FIG. 6 is a schematic cross-sectional view showing a sequence in which the heat generating sheet of FIG. 1 is placed on a holding member. FIG. 7 shows the distribution of the black body heat radiation flux on the coating layer side at 300 ° C. of the heating sheet of FIG. 1.

Claims (6)

A heating sheet for an induction heating cooker is characterized in that it includes a conductive sheet, and one side of the conductive sheet is laminated with a silicone resin sheet, and the other side is formed with a coating layer, and the silicone resin sheet and the coating layer both contain a heat radiation material. For example, the heat-generating sheet for an induction heating cooker according to the first patent application range, wherein the coating layer is a silicone resin coating layer. For example, the heat-generating sheet for an induction heating cooker according to the first patent application range, wherein the heat radiation material is a black pigment. For example, the heat-generating sheet for an induction heating cooker according to item 3 of the patent application, wherein the black pigment is a carbon-based pigment. For example, the heat-generating sheet for an induction heating cooker according to item 3 of the patent application, wherein the heat-generating sheet for an induction heating cooker formed by using the silicone resin sheet and the coating layer has heat radiation on the coating layer side at a temperature of 300 ° C and a wavelength of 5 μm. Emissivity is 380W‧m ^{- 2} ‧μm ^{- 1} or more. For example, the heat-generating sheet for an induction heating cooker according to item 1 of the patent application, wherein a surface of the silicone resin sheet opposite to the conductive sheet is affixed so that a part of the surface of the silicone resin sheet is exposed. Attached with a reinforced dielectric sheet with higher strength than this silicone resin sheet.