JP2007075507A - Manufacturing method of vessel for electromagnetic induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for easily forming a heat generating layer showing stable heating force at the side wall part of a vessel. <P>SOLUTION: The heat generating layer 12C is formed on the outer surface 13 of the side wall of a pot main body 10A by applying a transfer printing method. In this case, a belt-like transfer 30 is formed and this is wound along the direction of the circumference of the outer surface 13 of the side wall. In a transfer forming process, the full length in the longitudinal direction of a thin film layer 31 in the transfer 30 is formed to be longer than the length of the circumference of the outer surface 13 of the side wall. In a transfer process, one end part 31A and the other end part 31B in a longitudinal direction of the thin film layer 31 are superposed to each other. Thus, a cut off part of the thin film layer 31 is not generated at the joint of the transfer 30 to avoid that eddy current flowing through the heat generating layer 12 is cut off at the joint. Thus, the heat generating layer 12 which shows stable heating force is formed easily. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a container for an electromagnetic induction heating cooker.

  An electromagnetic induction heating cooker (IH cooker) generates lines of magnetic force by energizing a heating coil formed in an annular shape, and causes an eddy current to flow to the bottom of the pan by electromagnetic induction, causing the pan itself to generate heat. Is used to heat food. Therefore, in order to cook using this IH cooker, it is usually necessary to use a metal pan having conductivity. However, in cooking, it may be preferable to use a pot made of a non-conductive material such as a clay pot in terms of flavor and heat retention.

Then, the thing of patent document 1 is proposed as a clay pot which can be used for an IH cooking device, for example. In this structure, a heat generating layer (thin film metal film layer) is formed of a conductive material on the bottom of a clay pot, and heating is performed when the heat generating layer generates heat.
Registered Utility Model No. 3096191

  By the way, also in the inner pot for IH rice cookers, there is a demand to use a non-conductive material such as ceramic from the viewpoint of heat retention.

  Here, in the IH rice cooker, a heating coil is provided in a plurality of locations including not only the bottom surface but also the side surface for the purpose of causing convection in the entire interior of the inner pot, suppressing uneven cooking, and cooking uniformly. It is often done. In order to deal with such a rice cooker, it is necessary to provide a heat generating layer not only on the bottom surface of the inner pot but also on the side wall.

  As a method of providing a heat generating layer on the side wall in this way, for example, a method of pasting a thin film previously formed in a desired shape with a heat-resistant ceramic adhesive, etc., or printing a desired pattern directly on the side wall by screen printing The method of doing etc. is considered. However, in these methods, the thickness of the heat generating layer is uneven, and a stable heating power may not be obtained.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a method capable of easily forming a heat generating layer exhibiting a stable heating force on a side wall portion of a container.

  A method for manufacturing a container for an electromagnetic induction heating cooker according to the invention of claim 1 for solving the above-mentioned problem is a container body formed of a non-conductive material, and a conductive material and a side wall of the container body. A method for manufacturing a container for an electromagnetic induction heating cooker, comprising a heating layer provided on an outer surface and generating heat by electromagnetic induction from a heating coil provided in an electromagnetic induction heating cooker, wherein a conductive layer is formed on a support. A transfer forming step of forming a band-shaped pattern including the transfer step of transferring the band-shaped pattern to the outer surface of the side wall so that the length direction thereof is along the circumferential direction of the outer surface of the side wall; and the band-shaped pattern after the transfer And a firing step of firing.

  Invention of Claim 2 is a manufacturing method of the container for electromagnetic induction heating cooking appliances of Claim 1, Comprising: In the said transfer formation process, the strip | belt length of the said conductive layer is made longer than the circumference length of the said side wall outer surface. And forming both ends of the conductive layer in the length direction in the transfer step so as to overlap each other.

  According to the first aspect of the present invention, the heat generating layer is formed by applying the transfer printing method which is one of the ceramic decoration techniques. Here, when the heat generating layer is formed on the outer surface of the side wall of the container, a pattern having the same shape as that of the heat generating layer to be formed cannot be produced and pasted as it is, unlike the case where the heat generating layer is formed on a flat surface such as a bottom surface. For this reason, a heat generating layer is formed by forming a belt-like pattern and winding it along the circumferential direction of the outer surface of the side wall. Thereby, it is possible to easily form a heat generating layer having a uniform thickness and exhibiting a stable heating power.

  According to the invention of claim 2, in the transfer forming step, the entire length in the length direction of the conductive layer is formed longer than the circumferential length of the outer surface of the side wall, and both end portions in the length direction of the conductive layer in the transfer step Are superimposed on each other. As a result, the cut portion of the conductive layer is not generated at the joint of the belt-like pattern, and the eddy current flowing through the heat generating layer is prevented from being cut off at the joint. Thereby, the stable heating power is exhibited as the whole heat generating layer.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail with reference to FIGS. In this embodiment, the present invention is applied to an inner pot for an electromagnetic induction heating type rice cooker (IH rice cooker). FIG. 1 is a perspective view of an inner pot 10 according to the present embodiment (corresponding to the container for an electromagnetic induction heating cooker of the present invention) viewed from the bottom, and FIG. 2 shows the inner pot 10 of the present embodiment as IH. The schematic sectional side view which shows a mode that it set to the main body 20 of the rice cooker 1 (it corresponds to the electromagnetic induction heating cooking appliance of this embodiment) was shown.

  The main body 20 of the IH rice cooker 1 is formed in a bottomed cylindrical container shape that opens upward as a whole, and has a known configuration that can accommodate the inner pot 10 therein. In the bottom wall inner surface 21 of the main body 20, the peripheral edge portion (the connection portion with the side wall inner surface 22) is viewed from the side, while drawing a gentle arc that is concave in the outer surface direction (obliquely downward direction) of the main body 20. The bottom slope portion 21 </ b> A rises toward the top. Further, a lid portion (not shown) having a known configuration that covers the opening of the main body 20 so as to be freely opened and closed is attached to the upper portion of the main body 20 via, for example, a hinge.

  In the wall portion of the main body 20, three heating coils 23 for generating magnetic force and a high-frequency inverter 24 for controlling the output of the heating coil 23 are arranged. Of the three heating coils 23, the first heating coil 23 </ b> A is formed by winding a wire in a spiral shape to form a flat donut shape as a whole. It is arranged at a position corresponding to the central portion 21B, which is an area inside 21A. The second heating coil 23B is formed as a flat donut having an inner diameter larger than the outer diameter of the first heating coil 23A as a whole by winding a wire in a spiral shape. The heating coil 23A is arranged concentrically. The second heating coil 23B is arranged at a position corresponding to the bottom slope portion 21A, and outwards in the radial direction while drawing an arc along the bottom slope portion 21A from the inner peripheral edge side toward the outer peripheral edge side. It has an upward slope. The third heating coil 23 </ b> C is formed in a tubular shape as a whole by winding a wire in a spiral shape, and is disposed at a substantially central position in the vertical direction on the side wall portion 26 of the main body 20. .

  These heating coils 23 are connected to a high frequency inverter 24. Both the first heating coil 23A and the second heating coil 23B are connected to the first high-frequency inverter 24A, and output control is performed together. On the other hand, the third heating coil 23C is connected to a second high-frequency inverter 24B different from the first high-frequency inverter 24A, and is output independently from the first heating coil 23A and the second heating coil 23B. Can be controlled.

  The inner hook 10 accommodated in the main body 20 includes a ceramic pot main body 10A and a heat generating layer 12 provided on the outer wall surface (the bottom wall outer surface 11 and the side wall outer surface 13) of the pot main body 10A. . The hook body 10A is formed in a shape along the inner wall surface (the bottom wall inner surface 21 and the side wall inner surface 22) of the main body 20 as a whole. That is, it is formed in the shape of a cylindrical container with a bottom that opens upward as a whole, and the bottom wall outer surface 11 has a peripheral edge portion (connection portion with the side wall outer surface 13) in the outer direction of the inner pot 10 when viewed from the side. It has a round bottom shape that is a bottom slope portion 11A that rises in the outer peripheral direction while drawing a gentle arc that is concave.

  On the outer wall surface of the shuttle main body 10A, for example, thin plate-like heat generating layers 12 formed of a metal (corresponding to the conductive material of the present invention) such as silver, aluminum, and iron are provided at three locations. The three heat generating layers 12 are provided at positions aligned with the three heating coils 23A, 23B, and 23C when the inner pot 10 is set in the main body 20, respectively.

  That is, the first heat generating layer 12A is formed in a flat donut shape having an outer diameter and an inner diameter substantially equal to the outer diameter and the inner diameter of the first heating coil 23A. It is arranged in the central portion 11B, which is a region inside 11A. The second heat generating layer 12B is formed in a flat donut shape having an outer diameter and an inner diameter substantially equal to the outer diameter and the inner diameter of the second heating coil 23B, and is formed on the bottom slope portion 11A of the inner pot 10. The first heat generating layer 12A is disposed concentrically. The third heat generating layer 12C is formed in a cylindrical shape having a height substantially equal to the height of the third heating coil 23C, and is substantially at the center position in the vertical direction on the side wall outer surface 13 of the hook body 10A. Has been placed. Such a heat generating layer 12 can be formed by a transfer printing method or the like. Since the transfer printing method can make the thickness and weight of the heat generating layer 12 uniform and finely controlled, it is suitable for obtaining the heat generating layer 12 exhibiting a stable heating power.

  In the second heat generating layer 12B, a recess 14 formed in an annular shape concentric with the heat generating layer 12B is provided over the entire circumference in a region from the outer peripheral position slightly from the inner peripheral edge to the inner peripheral position slightly from the outer peripheral edge. It has been. Thereby, the area | region in which this recessed part 14 was formed is made into the low heat_generation | fever area | region where the thickness of the heat generating layer 12B is smaller than a peripheral area | region. What is necessary is just to set the formation position of the recessed part 14 according to the area | region where the emitted-heat amount is the largest in the heat_generation | fever layer 12B, and should just set it suitably with the model of the IH rice cooker 1. FIG.

  Further, by changing the thickness of the three heat generation layers 12 according to the outputs of the three heating coils 23, the amount of heat generation is adjusted to control the heating. That is, in the IH rice cooker 1 of the present embodiment, the first heating coil 23A and the second heating coil 23B are connected to a common high-frequency inverter 24A and controlled together. In such a configuration, it is impossible to individually control the outputs of the heating coils 23A and 23B in accordance with the progress of rice cooking, and in many cases, both the heating coils 23A and 23B should have the necessary outputs. Then, the output of the first heating coil 23A on the center side tends to be excessive. Therefore, the thickness of the first heat generating layer 12A is set to be larger than the thickness of the second heat generating layer 12B (the thickness of the portion where the concave portion 14 is not provided for the heat generating layer 12B is a standard thickness). It is thin. The third heating coil 23C is connected to another high-frequency inverter 24B and can be individually controlled, but the output is smaller than that of the first heating coil 23A and the second heating coil 23B. It is usually designed. Therefore, the thickness of the third heat generating layer 12C is set to the thickness of the first heat generating layer 12A and the thickness of the second heat generating layer 12B (standard thickness, that is, the thickness of the portion where the recess 14 is not provided). It is thicker than. In this way, by varying the thickness of the three heat generating layers 12 from each other, the amount of heat generated is averaged, the necessary heat is distributed throughout the inner pot 10, and overheating of a specific heat generating layer 12 is avoided. To be.

  When cooking rice using the IH rice cooker 1 configured as described above, rice and water (not shown) are put into the inner pot 10, set in the main body 20, and the lid is closed. . And when the switch of IH rice cooker 1 is turned on, a line of magnetic force is generated by passing a current from high-frequency inverter 24 to heating coil 23. Then, when the lines of magnetic force flow in the heat generating layer 12 of the inner pot 10, an eddy current is generated, and the heat generating layer 12 generates heat. This heat is transmitted to the inside of the inner pot 10 so that rice is cooked.

  The formation of the heat generating layer 12 on the inner pot 10 as described above can be performed by applying a transfer printing method which is one of the ceramic decoration techniques. Hereinafter, a method for forming the heat generating layer 12 by the transfer printing method will be described.

  The heat generating layer 12C on the side wall outer surface 13 side is prepared as follows (see FIGS. 3 to 6).

  First, the transfer 30 is formed (transfer forming process). For example, a metal paste such as silver paste is used to form a strip-shaped thin film layer 31 (corresponding to the conductive layer of the present invention) on a transfer sheet (not shown) as a support by screen printing or the like. At this time, the length of the thin film layer 31 is made slightly longer than the circumferential length of the side wall outer surface 13 of the hook body 10A. Since there is a limit to the thickness of the thin film layer 31 that can be formed by one screen printing, when it is desired to increase the thickness of the heat generating layer 12C, the thin film layer 31 is repeatedly formed on the thin film layer 31 formed by the first screen printing. A plurality of thin film layers 31 may be stacked by screen printing.

  After the formed thin film layer 31 is dried, a glass frit cover coat 32 is laminated on the thin film layer 31 by screen printing or the like. At this time, one end portion 32A in the length direction of the cover coat 32 protrudes in the length direction from one end portion 31A of the thin film layer 31, and the other end portion 32B in the length direction of the cover coat 32 is the other end portion 31B of the thin film layer 31. It is made to retreat in the length direction from (refer FIG. 4). The receding length of the other end portion 32B of the cover coat 32 may be equal to or slightly larger than the overlapping length of the one end portion 31A and the other end portion 31B of the thin film layer 31 in the transfer step described later. .

  Further, a top coat 33 made of resin is laminated on the cover coat 32 by screen printing or the like. At this time, one end portion 33A in the length direction of the top coat 33 coincides with one end portion 32A of the cover coat 32 (the end portion protruding from the one end portion 31A of the thin film layer 31), and the length direction in the top coat 33 The other end portion 33B of the cover coat 32 is set back in the length direction from the other end portion 32B of the cover coat 32 (the end portion of the thin film layer 31 that is retracted from the other end portion 31B). The receding length of the other end portion 33B of the top coat 33 may be equal to or slightly larger than the overlapping length of the one end portion 32A and the other end portion 32B of the cover coat 32 in the transfer process described later. .

  The transfer 30 thus formed (laminate of the thin film layer 31, the cover coat 32, and the top coat 33; corresponding to the belt-like pattern of the present invention) is peeled off from the transfer sheet, Winding is performed so that the length direction of the transfer 30 is along the circumferential direction of the side wall outer surface 13 (FIG. 3; transfer step). At this time, since the belt length of the thin film layer 31, the cover coat 32, and the resin topcoat 33 constituting the transfer 30 is longer than the length of one circumference of the side wall outer surface 13, the length direction in the transfer 30 (winding direction) ) Overlap each other (FIGS. 4 and 5). That is, the other end 31A on the other side overlaps the other end 31B of the thin film layer 31 (the part where the thin film layer 31 is exposed from the cover coat). Further, the other end portion 32A (the portion where the cover coat 32 protrudes from the thin film layer 31) overlaps the other end portion 32B (the portion where the cover coat 32 is exposed from the top coat 33) of the cover coat 32. .

  Here, since the overlapping portion is thicker than the other portions, the end portions of the thin film layer 31 and the cover coat 32 are formed to be shifted from each other, and the thickness of the overlapping portion is increased more than necessary by alternately staggering. It is avoiding that. Further, by retreating the other end portion 33B of the top coat 33 from the other end portion 32B of the cover coat 32, the top coat 33 that disappears by firing becomes the upper side of the thin film layer 31 and the cover coat 32. It is made not to enter under an edge part (one end part 31A, 32A) (refer to Drawing 5).

  On the other hand, the two heat generation layers 12A and 12B on the bottom wall outer surface 11 side are prepared as follows although not shown in detail. First, for example, a metal paste such as a silver paste is used, and a donut-shaped thin film layer is formed on a transfer sheet by screen printing or the like. After the formed thin film layer is dried, a glass frit cover coat is laminated on the thin film layer by screen printing or the like. Further, a resin top coat is laminated on the cover coat by screen printing or the like.

  Positions corresponding to the bottom slope portion 11A and the central portion 11B on the outer wall surface of the hook body 10A are peeled off from the transfer sheet, and the transfers 34 and 35 (laminates of the thin film layer, the cover coat, and the top coat) formed in this way. (See FIG. 3).

  Finally, the shuttle main body 10A to which all the transfers 30, 34, and 35 are attached is baked at a predetermined temperature for a predetermined time, and this transfer is baked on the shuttle main body 10A (baking step). Thereby, the thin film layer 31 is sintered to form the heat generating layer 12, and the cover coat 32 is sintered to form a glassy protective layer. Also, the resin top coat 33 disappears upon firing.

  As described above, according to the present embodiment, the heat generation layer 12C is formed on the side wall outer surface 13 of the pot body 10A by applying the transfer printing method which is one of the ceramic decoration techniques. Here, when the heat generating layer 12C is formed on the side wall outer surface 13, unlike the case where the heat generating layers 12A and 12B are formed on the bottom wall outer surface 11, a transfer 30 having the same shape as the heat generating layer 12 to be formed is prepared and pasted as it is. Cannot be attached. For this reason, the heat transfer layer 12C is formed by forming a belt-like transfer 30 and winding it along the circumferential direction of the side wall outer surface 13. Thereby, it is possible to easily form the heat generating layer 12C having a uniform thickness and exhibiting a stable heating power.

  In the transfer forming step, the entire length of the thin film layer 31 in the transfer 30 in the length direction is formed longer than the circumferential length of the side wall outer surface 13, and in the transfer step, one end portion 31 A in the length direction of the thin film layer 31 is formed. And the other end 31B are overlapped with each other. Thus, the cut portion of the thin film layer 31 is not generated at the joint of the transfer 30, and the eddy current flowing through the heat generating layer 12C is not interrupted by the joint. Thereby, the stable heating power is exhibited as the heat generating layer 12C as a whole.

The technical scope of the present invention is not limited by the above-described embodiments, and, for example, those described below are also included in the technical scope of the present invention. In addition, the technical scope of the present invention extends to an equivalent range.
(1) In this embodiment, the IH rice cooker 1 is provided with the three-stage heating coil 23, but the number of stages of the heating coil is not particularly limited, and may be two or less or four or more. . Further, the number of heat generating layers 12 is not limited to the above-described embodiment, and may be provided in accordance with the number of heating coils.
(2) In this embodiment, the recess 14 is provided in the heat generating layer 12B corresponding to the bottom slope portion 11A of the inner hook 10, but the recess does not necessarily need to be provided, and the heat generating layer has a uniform thickness as a whole. May be used.
(3) In the present embodiment, the two thin film layers 31 are laminated in the transfer forming step. However, the thin film layer 31 may be one layer, or three or more layers may be laminated.

The perspective view which looked at the inner pot for IH rice cookers in this embodiment from the bottom face direction Schematic side sectional view showing how the inner pot is set on the main body of the IH rice cooker The perspective view which shows a mode that transcription | transfer is transcribe | transferred to the side wall outer surface of a hook main body. Partial enlarged cross-sectional view showing the state before overlapping both ends of the transfer Partial enlarged sectional view showing the state after overlapping both ends of the transfer Partial enlarged sectional view showing the overlapping portion in the heat generating layer after firing

Explanation of symbols

10 ... Inner pot (container for electromagnetic induction heating cooker)
10A ... Pot body (container body)
12 ... exothermic layer 13 ... side wall outer surface 23 ... heating coil 30 ... transfer (band-like pattern)
31 ... Thin film layer (conductive layer)

Claims (2)

A container body formed of a non-conductive material; and a heat generation layer made of a conductive material and provided on the outer surface of the side wall of the container body and generating heat by electromagnetic induction from a heating coil provided in an electromagnetic induction cooking device. A method for manufacturing a container for an electromagnetic induction heating cooker comprising:
A transfer forming step of forming a belt-like pattern including a conductive layer on the support;
A transfer step of transferring the band-like pattern to the side wall outer surface so that the length direction thereof is along the circumferential direction of the side wall outer surface;
And a baking step of baking the belt-like pattern after the transfer. A method for producing a container for an electromagnetic induction heating cooker, comprising: In the transfer forming step, the conductive layer is formed to have a band length longer than a circumferential length of the side wall outer surface,
2. The method for manufacturing a container for an electromagnetic induction heating cooker according to claim 1, wherein both ends of the conductive layer in the length direction are overlapped with each other in the transfer step.

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