JP2014113222A - Dish and heating device for dish - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dish which increases safety, reliability, and stability in a temperature, is advantageous in the aspect of a cost, and reliably prevents breakage or the like of a dish body, and a heating device for a dish for allowing a user to continue to use a favorite dish or a familiar dish that has been used.SOLUTION: A dish D has a heating plate part which generates heat by electromagnetic induction and has a prescribed thickness on a bottom plate part 2d of a dish body 2. The dish body 2 is formed of a synthetic resin material R, and a housing recessed part 4 where the heating plate part 3 can be housed is formed on a lower surface 2dd of the bottom plate part 2d. In the housing recessed part 4, at least, the heating plate part 3 having a heating plate body 3m formed of a thermosensitive magnetic material M set to have a prescribed Curie temperature that is equal to a heatproof temperature of the synthetic resin material R or lower is housed. The housing recessed part 4 where the heating plate part 3 is housed is closed by a lid plate part 6.

Description

  The present invention relates to a tableware and a tableware heater provided with a heating plate portion having a predetermined thickness that generates heat by electromagnetic induction.

  In general, it is desirable that meals provided at hospitals or the like be provided with moderate warmth so as not to impair the patient's appetite. For this reason, recently, regarding the provision of meals, there is also an increasing number of methods for reheating and providing chilled-cooled food products. In this case, a reheating system based on the principle of electromagnetic induction heating is used. At the same time, tableware corresponding to such a reheating system is used.

  Conventionally, as a tableware used in such a reheating system, that is, as a tableware corresponding to electromagnetic induction heating, a plastic container for electromagnetic cooking disclosed in Patent Document 1 and a resin for electromagnetic induction heating disclosed in Patent Document 2 Tableware is known. The plastic container for electromagnetic cooking disclosed in Patent Document 1 is intended to prevent the resin from cracking due to the difference in thermal expansion between the conductor and the resin, and to prevent the conductor from tearing due to the injection molding pressure. Yes, specifically, in a plastic container for electromagnetic cooking with a conductor embedded in the bottom, the inner part of the plastic container is injection-molded, and a foil-like conductor with low specific resistance is attached to the outer bottom surface of the inner part. A metal plate having a higher specific resistance and higher strength than the conductor and having a smaller area than the conductor is attached to the lower surface of the conductor at the injection port when the outer portion is injection-molded. The outer part is injection molded.

  Further, the resin tableware for electromagnetic induction heating disclosed in Patent Document 2 does not cause peeling or cracking even when the electromagnetic induction heating is repeated, and the metal encapsulated at the time of molding is damaged and electromagnetic induction heating is sufficient. In particular, the first resin molded member includes a first resin molded member, a second resin molded member, and a metal net. And the second resin molded member are laminated, a part of the metal net is buried in the first resin molded member, and the remaining part of the metal net is the first resin molded member and the second resin molded member. The resin material supply position of the second resin molding member is sealed between the resin molding member and the position corresponding to the position (center portion) where the metal net is buried in the first resin molding member. It is.

JP 2005-193529 A JP 2012-050764 A

  However, the above-described conventional tableware (plastic container for electromagnetic cooking, resin tableware for electromagnetic induction heating) has the following problems.

  First, as a material for this type of tableware, it is not appropriate to use pottery and metal materials that are heavy and easily broken from the viewpoint of ensuring safety and lightness. For this reason, a plastic (synthetic resin) material is desirable, but plastic has a weak point in heat resistance. If the exothermic temperature exceeds the melting temperature of the plastic, the plastic may be melted, and unnecessary substances may be dissolved, which is difficult to ensure safety and reliability. Therefore, a means for ensuring sufficient heat resistance or suppressing temperature rise is necessary, but it cannot be said that these points are sufficiently considered in the case of conventional plastic tableware. In order to suppress the temperature rise, it can be realized by detecting the heating temperature and controlling the electromagnetic induction heating system, but a control system circuit is required and it is easy to manage the temperature of the tableware itself. However, it is disadvantageous in terms of cost and temperature stability.

  Second, there is a difficulty in durability. In particular, since Patent Document 1 may cause a resin crack due to a difference in thermal expansion between a conductor that is heated by electromagnetic induction and the resin, there is a background in which the conductor is configured by a net as in Patent Document 2. However, such a method sacrifices the original heating capability, and thus does not fundamentally solve the problem. That is, in order to avoid resin cracking, the heating ability is sacrificed, and when the heating ability is secured, there are at least two problems that cause resin cracking.

  The object of the present invention is to provide a tableware and a tableware heater that solve the problems in the background art.

  The tableware D according to the present invention is a tableware provided with a heating plate portion having a predetermined thickness that generates heat by electromagnetic induction in the bottom plate portion 2d of the tableware body 2 in order to solve the above-described problems. Is formed of the synthetic resin material R, and the accommodation recess 4 capable of accommodating the heating plate portion 3 is formed on the lower surface 2dd of the bottom plate portion 2d, and the accommodation recess 4 is at least equal to or lower than the heat resistant temperature of the synthetic resin material R. The heating plate portion 3 having the heating plate main body 3m formed of the thermosensitive magnetic material M set with a predetermined Curie temperature is accommodated, and the accommodating recess 4 accommodating the heating plate portion 3 is closed by the lid plate portion 6. It is characterized by becoming.

  In this case, according to a preferred embodiment of the present invention, the heating plate portion 3 includes a heating plate main body 3m formed of the temperature-sensitive magnetic material M and an auxiliary material formed of the nonmagnetic material A used on the upper surface of the heating plate main body 3m. The heating plate portion 3 can be formed in a size or shape that creates a gap Sc with respect to the tableware main body 2 side or the lid plate portion 6 side. Further, the lid plate portion 6 can be provided with a heat insulating recess 13 that provides the air layer 12 on the upper surface, and the lid plate portion 6 can be formed of the same material or different materials with respect to the tableware body 2. Furthermore, the cover plate part 6 is formed in a size that creates a gap Sr with respect to the tableware body 2 and can be joined to the tableware body 2 by filling the gap Sr with an elastic adhesive J. In addition, it is desirable to interpose the heat conductive grease G at one or more facing portions above the heating plate main body 3m and to interpose the heat insulating grease Gd at the facing portion below the heating plate main body 3m.

  On the other hand, the tableware heater H according to the present invention is configured to be attached to the lower surface 2odd of the bottom plate portion 2od of the tableware 2o in order to solve the above-described problem, and has a predetermined thickness that generates heat by electromagnetic induction. A tableware heater provided with a portion, which is made of a synthetic resin material R, and has a housing portion 7 having a housing recess 4 capable of housing the heating plate 3, and at least a synthetic resin housed in the housing recess 4 A heating plate portion 3 having a heating plate body 3m formed of a temperature-sensitive magnetic material M having a predetermined Curie temperature set to be equal to or lower than the heat resistance temperature of the material R, and a lid for closing the accommodation recess 4 in which the heating plate portion 3 is accommodated A plate portion 6 is provided.

  According to the tableware D and the tableware heater H according to the present invention having such a configuration, the following remarkable effects can be obtained.

  (1) The tableware D has a heating plate body 3m having a heating plate body 3m formed on the lower surface 2dd of the bottom plate portion 2d by a temperature-sensitive magnetic material M in which a predetermined Curie temperature that is at least the heat resistant temperature of the synthetic resin material R is set. Since the table 3 is provided, the tableware D itself has a temperature rise suppressing function, and the tableware D can set the heat resistant temperature of the synthetic resin material R by setting a predetermined Curie temperature that is equal to or lower than the heat resistant temperature of the synthetic resin material R. It will not rise beyond. Therefore, safety, reliability, and temperature stability can be improved. In addition, a control system circuit or the like is not required, which can be advantageous in terms of cost.

  (2) The tableware main body 2 is formed of the synthetic resin material R, and the accommodation recess 4 capable of accommodating the heating plate portion 3 is formed on the lower surface 2dd of the bottom plate portion 2d, and the temperature-sensitive magnetic material is formed in the accommodation recess 4 The heating plate portion 3 having the heating plate main body 3m formed by M is accommodated, and the accommodation recess 4 accommodating the heating plate portion 3 is closed by the lid plate portion 6, so that the shape and accommodation of the heating plate portion 3 are accommodated. The shape of the concave portion 4 side or the lid plate portion 6 side is made different so that the contact portion on the heating plate portion 3 and the housing concave portion 4 side or the lid plate portion 6 side can be reduced. As a result, even if the expansion coefficient of the synthetic resin material forming the tableware main body 2 or the lid plate portion 6 and the temperature-sensitive magnetic material M forming the heating plate portion 3 are different, the relative expansion and contraction of the two is absorbed. The crack of the tableware main body 2 can be avoided.

  (3) The tableware heater H is made of a synthetic resin material R, and has a housing part 7 having an accommodation recess 4 capable of accommodating the heating plate part 3 and at least the synthetic resin material R accommodated in the accommodation recess 4. The heating plate portion 3 having the heating plate main body 3m formed of the temperature-sensitive magnetic material M set at a predetermined Curie temperature, which is the heat-resistant temperature, and the lid plate portion 6 that closes the housing recess 4 that houses the heating plate portion 3 Therefore, this tableware heater H can be retrofitted with an adhesive J or the like to a commercially available normal tableware 2o. Therefore, for example, favorite tableware or familiar tableware can be used as it is.

  (4) According to a preferred embodiment, the heating plate portion 3 includes a heating plate main body 3m formed of the temperature-sensitive magnetic material M, and an auxiliary plate 3s formed of the nonmagnetic material A used on the upper surface of the heating plate main body 3m. When the temperature exceeds the Curie temperature, the heating efficiency can be lowered by the auxiliary plate 3s, so that an unnecessary temperature increase due to overshoot can be prevented and reliably suppressed to the heat resistant temperature or lower.

  (5) According to a preferred embodiment, if the heating plate portion 3 is formed in a size or shape that partially forms a gap Sc ... with respect to the tableware main body 2 side or the lid plate portion 6 side, the heating plate portion 3 is formed. Even if the expansion coefficient of the material (temperature-sensitive magnetic material M, nonmagnetic material A) and the expansion coefficient of the material (synthetic resin material R ...) forming the tableware body 2 or the cover plate portion 6 are different, Since the relative expansion and contraction of the two can be effectively absorbed by the gaps Sc, it is possible to more reliably prevent the tableware body 2 or the lid plate portion 6 from being cracked.

  (6) Since the heat insulating layer by the air layer 12 can be formed below the heating plate portion 3 by providing the heat insulating recess 13 that provides the air layer 12 on the upper surface of the lid plate portion 6 according to a preferred embodiment, the heating plate portion The heat insulation performance below 3 can be further increased, and it can contribute to further improvement in heating capacity (heating efficiency).

  (7) If the cover plate part 6 is formed of a different material with respect to the tableware body 2 according to a preferred embodiment, for example, a material with higher heat insulation performance can be selected. The heat insulation performance in the lower part can be further increased, and this can contribute to further improvement in heating capacity (heating efficiency).

  (8) According to a preferred embodiment, the cover plate portion 6 is formed in a size that creates a gap Sr with respect to the tableware main body 2, and the gap Sr is filled with an elastic adhesive J and joined to the tableware main body 2. By doing so, even if the expansion coefficient of the synthetic resin material forming the cover plate portion 6 and the expansion coefficient of the synthetic resin material R forming the tableware body 2 are different from each other, the relative expansion and contraction of the two can be reduced. Since it can absorb by J, the crack etc. of the tableware main body 2 or the cover-plate part 6 can be prevented effectively.

  (9) If heat conduction grease G is interposed in one or two or more facing portions above the heating plate main body 3m according to a preferred embodiment, the heat transfer performance from the heating plate main body 3m to the tableware main body 2 is further enhanced. Can contribute to further improvement in heating capacity (heating efficiency).

  (10) If the heat insulating grease Gd is interposed in the facing portion below the heating plate main body 3m according to a preferred embodiment, the heat insulating performance below the heating plate main body 3m can be further improved, and the heating capacity (heating efficiency) It can contribute to further improvement.

Front sectional view of tableware according to a preferred embodiment of the present invention, Partially broken bottom view of the tableware An exploded cross-sectional view for explaining the assembly method of the tableware, An enlarged front sectional view showing a part of the tableware, Change characteristic diagram of inner bottom surface temperature with respect to heating time for evaluating components in the tableware, Action illustration of the tableware, Change characteristics diagram of inner bottom surface temperature with respect to heating time of the tableware, Front sectional view of a tableware heater according to a preferred embodiment of the present invention, Front sectional view of the tableware heater attached to the tableware,

  Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.

  First, parts constituting the tableware D according to the present embodiment will be described with reference to FIGS.

  2 shows the tableware main body. The tableware main body 2 can be configured in the same manner as a general plastic tableware, although the shape (shape) of the bottom plate portion 2d is different. The illustrated tableware body 2 is a deep dish having a diameter of 16.5 [cm]. As a forming material, a melamine resin material that is excellent in moldability, water resistance, heat resistance, and the like, and that is not easily damaged and cracked is used. Using. The heat-resistant temperature that can be commonly used for the melamine resin material is about 110 to 130 [° C.]. In addition, as the forming material, various synthetic resin materials R excellent in moldability, water resistance, heat resistance and the like can be used. On the other hand, in the bottom plate portion 2d of the tableware main body 2, an accommodation recess 4 capable of accommodating a heating plate portion 3 described later is formed on the lower surface 2dd.

  Reference numeral 3 denotes a heating plate portion, and as shown in FIG. 3, a heating plate main body 3m positioned on the lower side and an auxiliary plate 3s positioned on the upper side are overlapped. The heating plate body 3m is formed in a disk shape from the temperature-sensitive magnetic material M. The thermosensitive magnetic material M is an alloy of iron (Fe) -nickel (Ni) -chromium (Cr) as a main component, and the Curie temperature can be changed by changing the blending ratio. The Curie temperature is a temperature at which the ferromagnetic property is lost above that temperature. Therefore, in the case of this embodiment, since the melamine resin material whose heat-resistant temperature will be about 110-130 [degreeC] was used as the tableware main body 2, as a Curie temperature, 120 [degreeC] can be set as an example. Since the upper limit of the heating temperature can be set, the Curie temperature can also be set according to the type of cooking to be provided. That is, if it is a rice cake bowl, it can be set to the temperature of rice cake that can be eaten most deliciously. In addition, the example heating plate main body 3m has a thickness of 0.8 [mm]. The auxiliary plate 3s is integrally formed of the nonmagnetic material A and is formed in a disk shape having the same size (shape) as the heating plate main body 3m. In the illustrated auxiliary plate 3s, aluminum is used as the nonmagnetic material A, and the thickness is selected to be 0.3 [mm].

  Reference numeral 6 denotes a cover plate portion, which is integrally formed of a predetermined synthetic resin material so that the housing recess 4 can be closed. The lid plate portion 6 may be formed of the same material, i.e., a melamine resin material, or a different material with respect to the tableware body 2. As the different material, an FRP resin material (fiber reinforced plastic material) can be used. FIG. 5 (a) shows the change characteristic of the inner bottom surface temperature [° C.] with respect to the heating time [min] depending on the material of the cover plate part 6, and when Pn is a melamine resin material, Pi is an FRP resin material. The case where is used is shown respectively. The inner bottom surface temperature is the temperature of the upper surface of the bottom plate portion 2d of the tableware main body 2 in a state where the water 200 [cc] is accommodated in the tableware main body 2 (the same applies to FIGS. 5B and 5C). As is clear from FIG. 5A, when forming the cover plate portion 6, if the FRP resin material, which is a different material with respect to the tableware main body 2, is used, the rate of temperature rise can be further increased. Since the lid plate portion 6 hardly affects the tableware body 2, a different material can be selected for the tableware body 2. Therefore, for example, by selecting a material with higher heat insulation performance or a material that does not interfere with absorption of magnetic field lines, it is possible to contribute to further improvement in heating capacity (heating efficiency).

  In addition, on the upper surface of the lid plate portion 6, the above-described heating plate portion 3, that is, a circular regulating recess 21 that regulates the superimposed heating plate main body 3 m and the auxiliary plate 3 s is formed. Therefore, the heating plate portion 3 described above can be substantially accommodated with respect to the regulating recess 21. By the way, the basic shape of the heating plate main body 3m described above (the auxiliary plate 3s is the same) is formed in a disc shape, but as shown in FIG. 2, four straight edge portions 3mr of equal intervals are formed in the peripheral portion. doing. Thereby, the shape of the regulation recessed part 21 in the accommodation recessed part 4 side and the shape of the heating plate part 3 will be different, and a part of the heating plate part 3 will be a tableware main body 2 side or the cover plate part 6 side, and it is a cover in embodiment. It can be formed in a size or shape that creates a gap Sc with respect to the regulating recess 21 of the plate portion 6. As a result, since the contact part between the heating plate part 3 and the regulation recessed part 21 can be reduced, the expansion coefficient of the material (temperature-sensitive magnetic material M, nonmagnetic material A) which forms the heating plate part 3, and the tableware main body 2 or lid | cover Even if the expansion coefficient of the material forming the plate portion 6 (synthetic resin material R ...) is different, the relative expansion and contraction of both can be effectively absorbed by the gap Sc ... There is an advantage that cracking of 6 and the like can be prevented more reliably.

  Furthermore, a heat insulating recess 13 having a smaller diameter than the recess surface is formed in the recess surface of the regulating recess 21. By forming the heat insulating recess 13, the air layer 12 is formed by the heat insulating recess 13 below the heating plate 3 when the heating plate 3 is accommodated in the regulating recess 21. FIG. 5 (b) shows the change characteristics of the inner bottom surface temperature [° C.] with respect to the heating time [minutes] when the air layer 12 is not provided and when the air layer 12 is not provided. The case where Qi provided the air layer 12 is shown, respectively. As is clear from FIG. 5 (b), if the heat insulating recess 13 is formed in the lid plate portion 6, a heat insulating layer by the air layer 12 can be formed below the heating plate portion 3. There is an advantage that the performance can be further enhanced and the heating capacity (heating efficiency) can be further improved.

  In addition, the outer diameter of the lid plate portion 6 is selected to be slightly smaller than the inner diameter of the housing recess 4, that is, the lid plate portion 6 is formed to a size that creates a gap Sr with respect to the tableware body 2. Thereby, as shown in FIG. 4, the clearance gap Sr for filling the adhesive agent J can be formed. Further, a stepped portion 22 is formed along the circumferential direction on the lower surface of the lid plate portion 6, and the stepped portion 22 is made to coincide with the position of the lower surface 2 dd of the bottom plate portion 2 d of the tableware body 2. In this case, since the hill 2p is usually provided on the outer peripheral side of the bottom plate portion 2d of the tableware body 2, the channel portion 24 along the circumferential direction can be formed by the step portion 22 and the hill 2p, and the gap described above Sr is located in the middle part of the channel part 24. Therefore, the channel portion 24 can be filled with the adhesive J.

  Next, an assembling method (manufacturing method) of the tableware D according to this embodiment having such parts will be described with reference to FIGS.

  First, as shown in FIG. 3, the heating plate main body 3 m is accommodated in the restriction recess 21 provided in the lid body portion 6 from the arrow Xj direction. Under the present circumstances, the heat insulation grease Gd is interposed in the facing part between the control recessed part 21 and the heating plate main body 3m. Thereby, since the heat insulation performance below the heating plate main body 3m can be further increased, it is possible to contribute to the improvement of the heating capacity (heating efficiency). FIG. 3 shows only an image in which the heat insulating grease Gd is interposed, but in actuality, it is applied so as to have uniformity over the entire facing portion between the regulating recess 21 and the heating plate main body 3m.

  In addition, the auxiliary plate 3s is overlapped from the direction of the arrow Xj by interposing the heat conductive grease G in the same manner on the heating plate main body 3m. Furthermore, the accommodation recess 4 provided in the bottom plate portion 2d of the tableware main body 2 is placed on the auxiliary plate 3s from the direction of the arrow Xj by interposing the heat conductive grease G in the same manner. Thus, if the heat conductive grease G is interposed at each facing portion above (the tableware main body 2 side) above the heating plate main body 3m, in particular, the heat transfer performance from the heating plate portion 3 to the tableware main body 2 is further enhanced. Can contribute to further improvement in heating capacity (heating efficiency). FIG. 5 (c) shows the change characteristics of the inner bottom surface temperature [° C.] with respect to the heating time [min] with and without the use of the heat conductive grease G, and Gn uses the heat conductive grease G. When there is no Gi, the case where Gi uses the heat conductive grease G is shown, respectively. As is apparent from FIG. 5C, the temperature increase rate can be further increased by using the thermal conductive grease G.

  On the other hand, when the above assembly is completed, as shown in FIG. 4, the gap Sr between the lid plate portion 6 and the tableware body 2 is filled with an adhesive J having a predetermined elasticity such as a silicone resin adhesive. The same adhesive J is also accommodated in the channel portion 24. Thereby, even if the expansion coefficient of the synthetic resin material that forms the cover plate portion 6 and the expansion coefficient of the synthetic resin material R that forms the tableware body 2 are different, the relative expansion and contraction of both is caused by the adhesive J. Since it can absorb, there exists an advantage which can prevent the crack etc. of the tableware main body 2 or the cover-plate part 6 effectively. When the adhesive S is filled in the gap Sr, the adhesive Sc is also filled in the gap Sc ... between the heating plate portion 3 and the regulating recess 21, so that the heating plate portion 3 is interposed via the adhesive J. Is also fixed. Further, since the upper surface of the cover plate portion 6 is covered with the heating plate portion 3 (heating plate main body 3m), an air layer 12 is formed below the heating plate portion 3 by the heat insulating recesses 13. By the above, if the adhesive agent J hardens | cures, the target tableware D can be obtained.

  As described above, in this embodiment, the lid plate portion 6 is formed of an FRP resin material that is a material different from the tableware main body 2, and the air layer 12 is formed by the heat insulating recesses 13 below the heating plate portion 3. In order to include each component that the heat conduction grease G is interposed at each facing portion above the heating plate body 3m and the heat insulating grease Gd is interposed at the facing portion below the heating plate body 3m. The heat insulation performance on the lower side of the heating plate main body 3m can be further improved, and the heat transfer performance on the upper side from the heating plate main body 3m can be further improved. As a result, there is an advantage that the heating capability (heating efficiency) by the heating plate portion 3 can be further improved by these synergistic effects.

  Next, the usage method and effect | action of the tableware D which concern on this embodiment are demonstrated with reference to FIG.6 and FIG.7.

  When using the tableware D according to the present embodiment, the chilled-cooled cooked product is arranged on the tableware D, and is set at a predetermined position of a reheating system using the principle of electromagnetic induction heating not shown. And the preset heating time is set with a timer, the reheating system is operated, and the heat treatment is started.

  6 (a) and 6 (b) are diagrams for explaining the action during heating of the tableware D, and FIG. 7 is a graph showing a change characteristic of the inner bottom surface temperature [° C.] with respect to the heating time [seconds] of the tableware D. In this case, water is not accommodated in the tableware D, unlike the temperature rise test of FIGS. First, by the start of heating, the magnetic force lines Fm... Shown by the dotted arrows in FIG. At this time, the temperature of the heating plate main body 3m formed of the temperature-sensitive magnetic material M starts to increase from substantially normal temperature in the case of illustration. In addition, when chilled cooling is performed in a state where cooked products are arranged on the tableware D, the temperature rise is started from several [° C.]. Since the temperature of the heating plate main body 3m is equal to or lower than the Curie temperature in the initial temperature rising or in the middle of the temperature rising, as shown in FIG. 6A, the magnetic field lines Fm ... concentrate the ferromagnetic heating plate main body 3m. Pass through. As a result, the eddy current Is... Flows through the heating plate body 3m having a large electric resistance, and Joule heat is generated to perform the heating action. In the case of FIG. 7, as indicated by a change characteristic Td indicated by a solid line, the temperature reaches around 120 ° C. after about 60 seconds have elapsed since the start of heating.

  Assuming that the Curie temperature is set to 120 [° C.] and there is no auxiliary plate 3s, the ferromagnetic properties of the thermosensitive magnetic material M are rapidly lost when the heating temperature exceeds 120 [° C.]. Therefore, the electrical resistance of the heating plate body 3m is reduced, and the generation of Joule heat is also rapidly reduced. In this case, overshoot occurs only with the heating plate body 3m, and the actual heating temperature slightly exceeds 120 [° C.] as shown by the change characteristic Tde indicated by the phantom line in FIG.

  On the other hand, in this embodiment, since the auxiliary plate 3s formed of the nonmagnetic material A (aluminum) is superimposed on the upper surface of the heating plate body 3m, the ferromagnetic property of the temperature-sensitive magnetic material M is lost. As shown in FIG. 6 (b), the magnetic lines of force Fm ... also pass through the auxiliary plate 3s, and the eddy current Is ... also flows through the auxiliary plate 3s. Thereby, the heating efficiency is further reduced as compared with the case of only the heating plate main body 3m, and an unnecessary temperature increase due to overshoot is avoided. That is, the actual heating temperature is suppressed to approximately 120 [° C.] as shown by the change characteristic Td indicated by the solid line in FIG.

  Therefore, according to such tableware D according to the present embodiment, the lower surface 2dd of the bottom plate portion 2d is formed of the temperature-sensitive magnetic material M in which a predetermined Curie temperature that is equal to or lower than the heat-resistant temperature of the synthetic resin material R is set. Since the heating plate portion 3 having the heated plate body 3m is provided, the tableware D itself has a temperature rise suppressing function, and the tableware D is set by setting a predetermined Curie temperature that is equal to or lower than the heat resistant temperature of the synthetic resin material R. The temperature does not rise beyond the heat resistance temperature of the synthetic resin material R. Therefore, safety, reliability, and temperature stability can be improved. In addition, a control system circuit or the like is not required, which can be advantageous in terms of cost. Further, the tableware main body 2 is formed of the synthetic resin material R, and an accommodation recess 4 capable of accommodating the heating plate portion 3 is formed on the lower surface 2dd of the bottom plate portion 2d, and the temperature-sensitive magnetic material M is formed in the accommodation recess 4. The heating plate portion 3 having the heating plate main body 3m formed by the above method is accommodated, and the accommodation recess 4 containing the heating plate portion 3 is closed by the lid plate portion 6, so that the shape of the heating plate portion 3 and the accommodation recess The shape on the 4 side or the lid plate portion 6 side is made different, and the contact portion on the heating plate portion 3 and the housing recess 4 side or the lid plate portion 6 side can be reduced. As a result, even if the expansion coefficient of the synthetic resin material forming the tableware main body 2 or the lid plate portion 6 and the temperature-sensitive magnetic material M forming the heating plate portion 3 are different, the relative expansion and contraction of the two is absorbed. The crack of the tableware main body 2 can be avoided.

  Next, an embodiment of the tableware heater H according to another embodiment of the present invention will be described with reference to FIGS. 8 and 9.

  The tableware heater H is a separate heater by extracting the functional part of the heating plate 3 provided on the bottom plate 2d of the tableware D shown in FIGS. 1 to 4 as shown in FIG. It is composed. Therefore, as shown in FIGS. 8 and 9, it can be attached (attached) to the lower surface 2odd of the bottom plate portion 2od of the ordinary tableware 2o that is generally commercially available. As a result, when the tableware heater H is attached to the tableware 2o, it has the same structure and the same function as the tableware D described above.

  The tableware heater H includes a housing portion 7 that is integrally formed of a synthetic resin material R and has an accommodation recess 4 that can accommodate the heating plate portion 3. The housing portion 7 can be formed in a shape that is obtained by cutting out the portion of the bottom plate portion 2d having the accommodating recess 4 in the tableware D described above, and as shown in FIG. It has a flat cylindrical peripheral surface portion 7f extending perpendicularly downward from the peripheral edge of the upper surface portion 7u, and has a shape obtained by inverting a circular tray with one surface open.

  For this reason, the same components as those in the embodiment of FIGS. 1 to 4 described above can be used as the other components excluding the housing portion 7. That is, the housing recess 4, the heating plate body 3m, the auxiliary plate 3s, the cover plate portion 6, the heat conduction grease G, and the heat insulating grease Gd are the housing recess 4, the heating plate body 3m, and the auxiliary plate 3s shown in FIGS. , The cover plate portion 6, the heat conductive grease G, and the heat insulating grease Gd. Therefore, the obtained effects are the same. In addition, in FIG.8 and FIG.9, while attaching | subjecting the same code | symbol to the same part as FIGS. 1-4, the structure is clarified and the detailed description is abbreviate | omitted.

  Thus, the tableware heater H according to the present embodiment is formed of the synthetic resin material R, and is housed in the housing recess 7 having the housing recess 4 that can accommodate the heating plate 3 and the housing recess 4. At least a heating plate portion 3 having a heating plate main body 3m formed of a temperature-sensitive magnetic material M having a predetermined Curie temperature set as a heat-resistant temperature of the synthetic resin material R, and an accommodation recess 4 in which the heating plate portion 3 is accommodated. Since the lid plate portion 6 is closed, the tableware heater H can be used after being attached to the ordinary tableware 2o that is generally commercially available with an adhesive J or the like. Therefore, for example, favorite tableware or familiar tableware can be used as it is.

  The preferred embodiment has been described in detail above, but the present invention is not limited to such an embodiment, and the detailed configuration, shape, material, quantity, numerical value, and the like do not depart from the gist of the present invention. It can be changed, added, or deleted arbitrarily.

  For example, the case where the heating plate portion 3 is constituted by a heating plate main body 3m formed of a temperature-sensitive magnetic material M and an auxiliary plate 3s formed of a nonmagnetic material A used on the upper surface of the heating plate main body 3m is shown. However, this does not exclude the case where the heating plate portion 3 is configured by only the heating plate main body 3m without using the auxiliary plate 3s. Moreover, although a part of the heating plate part 3 is formed in a size or shape that creates a gap Sc ... with respect to the tableware body 2 side or the lid plate part 6 side, the entire heating plate part 3 is the tableware body 2 side or lid. It may be a size or shape that creates a gap Sc with respect to the plate portion 6 side. Furthermore, although the case where the air layer 12 was provided was shown, if necessary, another heat insulating member such as a heat insulating plate may be accommodated inside the air layer 12, or the case where the air layer 12 is not provided at all is excluded. It is not a thing. On the other hand, although the case where the heat insulation grease Gd was interposed in the facing part between the accommodation recessed part 4 and the heating plate main body 3m was shown, the case where it does not interpose is not excluded. Similarly, although the case where the heat conductive grease G is interposed at each facing portion above the heating plate main body 3m is shown, the heat conductive grease G may be interposed at all of the facing portions, or one of them. You may interpose in a part. Moreover, the case where the heat conductive grease G is not interposed at all is not excluded. On the other hand, the lid body portion 6 is formed in a size that creates a gap Sr with respect to the tableware main body 2, and the adhesive S having elasticity is filled in the gap Sr and joined to the tableware main body 2. Depending on the type of material to be formed, such as forming the cover plate portion 6 with a material having a predetermined elasticity (displacement absorption capability), it is not necessary to provide the gap Sr. It is also possible to use means.

  The tableware according to the present invention can be used in various facilities such as hospitals and schools. The tableware heater according to the present invention can be used for various tableware such as plastic tableware, metal tableware, and ceramic tableware. Tableware includes various types of dishes such as dishes, bowls, and cups.

  2: tableware body, 2d: bottom plate portion, 2dd: bottom surface of bottom plate portion, 2o: tableware, 2od: bottom plate portion, 2odd: bottom surface of bottom plate portion, 3: heating plate portion, 3m: heating plate body, 3s: auxiliary plate, 4: receiving recess, 6: cover plate, 7: housing, 12: air layer, 13: heat insulating recess, R: synthetic resin material, M: temperature-sensitive magnetic material, A: nonmagnetic material, D: tableware, Sc ...: Gap, Sr: Gap, J: Adhesive, G: Thermally conductive grease, Gd: Thermal insulation grease, H: Tableware heater

Claims (9)

  A tableware provided with a heating plate portion having a predetermined thickness that generates heat by electromagnetic induction on the bottom plate portion of the tableware body, wherein the tableware body is formed of a synthetic resin material, and a heating plate is formed on the lower surface of the bottom plate portion. A heating plate having a heating plate body formed of a temperature-sensitive magnetic material in which a predetermined Curie temperature that is at least equal to or lower than the heat resistance temperature of the synthetic resin material is formed in the housing recess. A tableware characterized in that the housing recess is accommodated with a lid plate portion.   The said heating plate part is comprised by the heating plate main body formed with the said temperature-sensitive magnetic material, and the auxiliary | assistant plate formed with the nonmagnetic material used on the upper surface of this heating plate main body. Tableware.   3. The tableware according to claim 1, wherein a part of the heating plate portion is formed in a size or shape that creates a gap with respect to the tableware main body side or the lid plate portion side.   The tableware according to claim 1, 2 or 3, wherein the lid plate portion is formed with a heat insulating recess having an air layer on the upper surface.   The tableware according to any one of claims 1 to 4, wherein the lid plate portion is formed of the same material or a different material with respect to the tableware main body.   The said cover board part is formed in the magnitude | size which produces a clearance gap with respect to the said tableware main body, the adhesive agent which has elasticity in the said clearance gap is filled, and it joins to the said tableware main body, It is characterized by the above-mentioned. Tableware in any one of 5.   The tableware according to any one of claims 1 to 6, wherein heat conduction grease is interposed in one or more facing portions above the heating plate main body.   The tableware according to any one of claims 1 to 7, wherein heat-insulating grease is interposed in a facing portion below the heating plate main body.   A tableware heater that is configured to be attachable to the lower surface of a bottom plate portion of tableware and has a heating plate portion having a predetermined thickness that generates heat by electromagnetic induction, and is formed of a synthetic resin material, and the heating plate portion Heating having a housing part having a housing recess that can be housed, and a heating plate body that is housed in the housing recess and is formed of a temperature-sensitive magnetic material that is set to at least a predetermined Curie temperature that is equal to or lower than the heat-resistant temperature of the synthetic resin material A tableware heater comprising: a plate portion; and a lid plate portion that closes the housing recess containing the heating plate portion.

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