JP2012040272A - Induction heating type rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating type rice cooker in which a pot for the rice cooker is hardly scratched when it is taken in and out.SOLUTION: The induction heating type rice cooker includes the pot 9 for the rice cooker freely detachably housed in a body (not shown in the figure), and a protective frame bottom (not shown in the figure) and a protective frame body 14 configuring a part to house the pot 9 for the rice cooker. In the pot 9 for the rice cooker, a monolayer or multilayer metal is used as a base material, and the metal of the outermost layer is constituted of a magnetic metal 17. Also, roughening treatment is applied to the surface of the magnetic metal 17, and the roughened surface is provided with a coating film 21 whose main component is a heat-resistant resin, and to which mica, a pigment and a luminous material are added as needed and 0.5-1.5 wt.% of a lubricative substance is further added. Since the appropriate lubricative substance is added to the coating film 21 on the outer surface of the magnetic metal 17, friction between the coating film 21 on the outer surface of the pot 9 for the rice cooker and the protective frame body 14 is lowered, the coating film 21 is hardly rubbed, high-quality appearance and flavor performance are maintained for a long period of time, and handleability is excellent since the pot 9 for the rice cooker does not turn when serving rice.

Description

  The present invention relates to an electromagnetic induction heating rice cooker, and more particularly to a rice cooker pan used in an electromagnetic induction heating rice cooker.

  Conventionally, a rice cooker pan of an electromagnetic induction heating rice cooker that is widely available to the general public has been manufactured using aluminum, stainless steel, titanium, iron, copper, or a composite material combining these as a base material.

  In particular, in a rice cooker pan used in an electromagnetic induction heating rice cooker, a magnetic metal such as ferritic stainless steel is arranged on the outer layer of the pan base material, and aluminum is laminated on the inside thereof, or in some cases, further on the inner surface thereof. Some of them are laminated with stainless steel.

  Magnetic materials such as ferritic stainless steel are often used for the outer layer of rice cooker pans because highly magnetic materials are more advantageous for heat generation due to electromagnetic induction as a characteristic of electromagnetic induction heating. Aluminum with high thermal conductivity is often used for the inner layer of the pot for the purpose of quickly spreading heat and uniformly heating the food.

  Further, these metal rice cooker pots are treated with a fluororesin coat on the inner surface in order to prevent the food from being strongly adhered, thereby improving the non-adhesiveness to the food.

  The fluororesin coat to be processed on the inner surface of the rice cooker pan is usually one having a two-layer structure or three or more layers, but has good non-adhesiveness, high durability and From the viewpoint of obtaining a good appearance, it is preferable to form a fluororesin coat having two or more layers.

  In conventional rice cooker pans for electromagnetic induction heating, it has been mentioned as a conventional problem that the heat generation is further improved. As a means for improving the heat generation from the material side of the rice cooker pan, is a material having a high relative permeability used? It is effective to use a material having a high specific resistance.

  From these viewpoints, ferritic stainless steel represented by SUS430 as a magnetic metal has been often used for the heat generation layer of the electromagnetic induction heating type rice cooker pan. In addition, there were cases where iron alloys such as permalloy were used and cases where copper plating was applied to the outer surface of the magnetic metal.

  In rice cooker pans, improving rice cooking performance is a major proposition, and traditional rice cooker pans have been designed to increase the thickness of the base material in order to distribute heat evenly, or to stack the base material in multiple layers. In addition, in order to take a configuration in which the heat generated in the magnetic metal of the rice cooker pan and transferred to the pan is contained in the rice cooker pan, an appropriate thickness coating is provided on the outer surface of the rice cooker pan. This is also an important means for improving the taste.

  In addition, in this way, when a coating film is provided on the outer surface of the rice cooker pan, it is a great advantage that the beauty of the appearance can be improved due to the nature of the product, and the appearance is warmer than when the metal layer is exposed. In addition, it can be expected to improve corrosion resistance (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 9-192001

  Here, when considering the actual usage of the electromagnetic induction heating rice cooker, the rice cooker pan is placed in a situation where it is frequently put in and out of the rice cooker body in daily use, and contacts the protective frame body each time it is put in and out. There is a high possibility of wear, but in the conventional electromagnetic induction heating rice cooker configuration, the coating film processed on the outer surface of the rice cooker pan is lower than the material of the protective frame body of the electromagnetic induction heating rice cooker In addition, the rice cooker pan's outer surface is worn and scratched by the addition and removal of the rice cooker pan, resulting in significant damage to the appearance and peeling of the coating film, which adversely affects rice cooking performance was there.

  One way to solve this problem is to improve the sliding by using a silicone coating on the outer surface of the rice cooker pan to improve the abrasion resistance of the coating film. When the rice cooker pan turns around in the rice cooker, it causes a phenomenon of turning around the pan, and the rice in the rice cooker pan is difficult to be used.

  In addition, when the hardness of the protective frame cylinder is lower than the coating film on the outer surface of the rice cooker pan, the protective frame cylinder is worn and scratched by taking in and out of the rice cooker pot, resulting in a problem that the appearance is greatly impaired. there were.

  The present invention solves the above-described conventional problems, and an object thereof is to provide an electromagnetic induction heating rice cooker capable of maintaining a high-quality appearance and high rice cooking performance for a long period of time while preventing the pan from being turned around. It is what.

  In order to solve the above-described conventional problems, the electromagnetic induction heating rice cooker of the present invention includes a main body, a rice cooker pot that is detachably stored in the main body, and a protection that constitutes a part that houses the rice cooker pot. The rice cooker pan is provided with a single layer or multiple layers of metal, and the outermost layer metal of the substrate is composed of magnetic metal, and the surface of the magnetic metal is roughened. The surface is roughened with heat-resistant resin as the main component, and mica, pigment and glittering material are added if necessary, and 0.5 to 1.5% by weight of lubricant is added. Since the coating film processed on the outer surface of the magnetic metal is added with an appropriate lubricating substance, the coating film processed on the outer surface of the rice cooker pan and the protective frame body Because the friction between the two can be reduced, the coating film is less likely to be rubbed and has a high quality appearance and taste performance. It is possible for a period of time maintenance, does not occur reduction in the usability of rice dexterity pot turns round and round when the expected rice.

  The electromagnetic induction heating rice cooker of the present invention can enhance the wear resistance of the coating film and the protective frame body provided on the outer surface of the rice cooker pan, so that it can maintain a high-grade appearance and taste performance for a long period of time. it can.

Sectional drawing of the electromagnetic induction heating type rice cooker in Embodiment 1 of this invention. Partial enlarged cross-sectional view of the rice cooker pot and protective frame body of the same electromagnetic induction heating rice cooker Scratches on the outer coating of the pan when each pan with the added amount of PTFE added to the outer coating of the rice cooker pan of the electromagnetic induction heating rice cooker is put in and out of the rice cooker body, and rice The figure which shows the result which evaluated the roundness of the pot of time A scratch on the protective frame body when each rice cooker pan in which the amount of the lubricating material added to the protective frame body coating film of the electromagnetic induction heating rice cooker in Embodiment 2 of the present invention is added to and removed from the main body, and The figure which shows the result of having evaluated the adhesiveness of a protective frame trunk coating film

  1st invention is equipped with the main body, the pan for rice cookers accommodated in the said main body so that attachment or detachment is possible, the protective frame which comprises the site | part which accommodates the said rice cooker pan, and the said rice cooker pan are single-piece | units. The outermost layer metal of the base material is composed of a magnetic metal, and the surface of the magnetic metal is roughened, and the heat-resistant resin is applied to the roughened surface. In addition to the addition of mica, pigment, and luster as necessary, a coating film containing 0.5 to 1.5% by weight of a lubricating substance is provided, and more specifically, Ferrite stainless steel, which is a magnetic metal with excellent electromagnetic induction heating characteristics, or a multilayer metal such as a clad material obtained by joining a heat-conductive metal such as aluminum and ferrite stainless steel, For rice cookers obtained by molding and processing this as a base material Of the outer surface, i.e., the surface roughness Ra by shot blasting by alumina particles on the surface of the magnetic metal to practice the roughening treatment such that 0.5 to 5 [mu] m.

  Next, a coating film is formed on the surface of the roughened magnetic metal. Preferably, a heat-resistant coating film such as an epoxy system, a silicone system, or a polyether sulfone system is provided.

  In addition, by adding appropriate amounts of pigments, glittering materials, ceramic particles, hollow glass beads, hollow ceramic beads, etc. to this coating film, it is possible to obtain a high-grade appearance, improve wear resistance, It is also possible to improve the rice cooking performance by imparting heat insulation to the rice cooker pan.

  Here, 0.5 to 1.5% by weight of a fluororesin-based lubricant is added to the coating film as an additive.

  Fluororesin lubricants include polytetrafluoroethylene (PTFE), polytetrafluoroethylene = perfluoroalkyl vinyl ether copolymer (PFA), polytetrafluoroethylene = hexafluoropropylene copolymer (FEP), polytetrafluoroethylene There are fluoroethylene = ethylene copolymer (ETFE), vinylidene fluoride resin (PVDF), chlorotrifluoroethylene resin (PCTFE), and the like.

  Addition of less than 0.5% by weight of fluororesin-based lubricant to the paint film does not improve the slipperiness between the paint film and the protective frame body, and the paint film is damaged when the rice cooker pan is put in and out, resulting in a remarkable appearance. There is a high possibility of damage.

  On the other hand, if more than 1.5% by weight of a fluororesin-based lubricant is added to the coating film, the sliding property of the coating film increases and scratches are less likely to occur when putting in and out of the pan, but the coating film slips too much. Because the nature increases, when the rice in the rice cooker pan is covered with rice, the rice cooker pan rotates and the usability becomes very poor.

  This is a phenomenon caused by the fact that the pan rotation stopper rubber, the bottom temperature sensor, the upper frame cap and the coating film on the outer surface of the pan slide on each other.

  Considering the above, it is most desirable that the fluororesin-based lubricant added to the coating film be 0.5 to 1.5% by weight.

  In addition, you may process the fluorine resin coat for improving non-adhesiveness to the inner surface of the pan for rice cookers.

  According to this configuration, since an appropriate lubricating substance is added to the coating film processed on the outer surface of the magnetic metal of the rice cooker pan, the coating film to be processed on the outer surface of the rice cooker pot and the protective frame body Because the friction can be lowered, the coating film is less likely to rub, and the high-quality appearance and taste performance can be maintained for a long period of time. There is no decline.

  In addition, since the surface of the magnetic metal is roughened, the adhesion of the coating film to be treated on the surface is high, and the corrosion resistance of the magnetic metal can be prevented from being deteriorated. can do.

  In the second invention, in particular, the protective frame body of the first invention is made of metal, and when the rice cooker pan is mounted, the surface facing the rice cooker pan is treated with a coating film, In the coating film, a lubricating substance is added in an amount of 0.1 to 1% by weight. More specifically, a steel plate or various types of plating such as aluminum and zinc are used as the base material of the protective frame body portion. Of these base materials, a coated film is provided on at least the surface facing the rice cooker pan, and the coated material contains 0.1 to 1% by weight of a lubricating material. It has been added.

  The coating film is selected from resin coatings such as polyester, urethane, acrylic, epoxy, and various heat-resistant resins such as polyethersulfone, but the pencil hardness of the coating is H or higher. Desirably, the lubricating substance added to the coating film is selected from silicone oil, fluorine oil, silicone resin, and fluorine resin.

  When the added lubricant is less than 0.1% by weight, the slipping property of the coating film and the protective frame cylinder does not become good, and the coating film on the protective frame cylinder is damaged when the rice cooker pan is put in and out. There is a high probability of damage.

  On the other hand, when more than 1% by weight of a lubricating substance is added to the coating film, the slipping property of the coating film increases and it becomes difficult to be damaged when putting in and out of the rice cooker pan, but it adversely affects the adhesion and appearance of the coating film. Or durability may be reduced.

  Considering the above, it is most desirable that the amount of the lubricating substance added to the coating film of the protective frame body is 0.1 to 1% by weight.

  According to this configuration, since an appropriate lubricating material is added to the coating film processed on the protective frame cylinder, the friction between the coating film processed on the outer surface of the rice cooker pan and the protective frame cylinder can be reduced. Therefore, the coating film is hardly rubbed, and a high-quality appearance and taste performance can be maintained for a long time.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a sectional view of an electromagnetic induction heating rice cooker in Embodiment 1 of the present invention, FIG. 2 is a partially enlarged sectional view of a rice cooker pan and a protective frame body of the electromagnetic induction heating rice cooker, and FIG. , Scratches on the outer coating film of the pan when each pan with the added amount of PTFE added to the outer coating film of the rice cooker pan of the electromagnetic induction heating rice cooker is put in and out of the rice cooker body, and rice It is a figure which shows the result of having evaluated the roundness of the pan at the time of a storm.

In FIG. 1, 2, the electromagnetic induction heating coil 3 is provided in the inside of the main body 1 of the electromagnetic induction heating type rice cooker in this Embodiment which heats the rice cooker pan 9, and the rice cooker pan 9 is heated by electromagnetic induction heating. In addition, the pan bottom temperature detection sensor 8 is provided so that the temperature of the rice cooker pan 9 can be detected.

  Moreover, in the main body 1 that detachably stores the rice cooker pan 9, a lower protective frame 13, a protective frame barrel 14, an upper frame cap 15, a pan rotation-preventing rubber 16, and a heating plate 7 are arranged around the pan. .

  The protective frame body 14 is a member arranged to face the side portion of the rice cooker pan 9, the upper frame cap 15 is a member that supports the rice cooker pan 9, and the pan rotation-preventing rubber 16 is a rice cooker pan. This is a resistor that prevents the rice cooker pan 9 from rotating when it is in contact with the outer surface of the rice cooker 9 when the rice is ready.

  Here, as shown in FIG. 2, the rice cooker pan 9 is made of a clad material in which a ferrite stainless steel having a thickness of 0.5 mm is used as a magnetic metal 17 and an aluminum 18 having a thickness of 1.0 mm is joined thereto. It is made into a pan shape by pressing with the magnetic metal 17 side as the outer surface.

  The protective frame body 14 is a 0.4 mm-thick steel plate 22 provided with a polyester-based coating film 23 having a thickness of 20 μm on the surface facing the rice cooker pan 9, and is processed into a cylindrical shape. It is configured to be arranged on the outer surface with a space of several mm.

  The surface of the aluminum 18 on the inner surface of the rice cooker pan 9 is treated with the following two-layer fluororesin coat of a primer layer 19 and a top coat 20.

  After the base material is press-molded into a pan shape and washed, the surface of the aluminum 18 on the inner surface of the rice cooker pan 9 is sandblasted to adjust the surface roughness Ra to 3 to 5 μm, and then bonded to the fluororesin. A liquid primer coating containing components, pigments, and glitter as coating film constituents was applied to a film thickness of about 10 μm after film formation, and dried at 100 ° C. for 20 minutes to form a primer layer 19.

  When the primer drying is completed and the substrate temperature is sufficiently lowered, a fluororesin powder coating that does not contain additives such as pigments and glittering materials as a top coat treatment is deposited on the primer to a film thickness of 35 μm. Then, the top coat 20 was formed by baking at 400 ° C. for 15 minutes.

  On the other hand, a roughened surface (not shown) is formed on the outer surface of the magnetic metal 17 constituting the outer layer of the pan base material by adjusting the surface roughness Ra to 0.5 to 3 μm by sandblasting. Then, a silicone / epoxy heat resistant paint was applied so that the film thickness after film formation was about 30 μm, and baked at 200 ° C. for 15 minutes to obtain a coating film 21.

  The coating film 21 is added with 0.5 to 1.5% by weight of polytetrafluoroethylene (PTFE).

  Here, the base material is a laminated material of aluminum and ferritic stainless steel having the same thickness as the rice cooker pan 9 of the present embodiment, and a silicone / epoxy heat-resistant coating film is provided on the outer surface so as to have a thickness of about 30 μm. In addition, each rice cooker pan 9 produced by adding 0 to 0.3 wt% and 2 to 3 wt% PTFE to the heat-resistant coating film is used as a comparative example and compared with the rice cooker pan 9 in the present embodiment. Experiments were performed.

  When the rice cooker pan 9 with the added amount of PTFE added to the coating film on the outer surface of the rice cooker pan 9 is put in and out of the main body 1, the scratches on the outer coating film of the rice cooker pan 9 and when the rice is placed The result of having evaluated the roundness of the rice cooker pan 9 is shown in FIG.

  In FIG. 3, in the case of 5.5 go rice cooker pan, when the putting in and out of the main body 1 is repeated 100 times, it shows the result of evaluating the scratches on the rice cooker pan, and × The case where scars did not occur was evaluated as ◯.

  In addition, about the pot circumference, the rice after 3 rice is cooked normally, and shows the goodness of the rice after cooking. × means that the rice cooker pan 9 is difficult to turn around when it is off. It means that ○ means that the rice cooker pan 9 is difficult to turn and is easy to turn around.

  As shown in FIG. 3, compared with the rice cooker pan 9 in the present embodiment, when the amount of PTFE added is less than or larger than that of the present embodiment, there is a problem with the scratches or panning and good results are obtained. I can't.

  From the above results, it is necessary to add an appropriate amount of a lubricating material to the coating film in order to suppress the coating of the outer surface of the pan and the damage to the protective frame body 14 and to prevent the pan around. As can be seen, in order to obtain good results, it is important to set the content to 0.5 to 1.5% by weight.

(Embodiment 2)
Hereinafter, the electromagnetic induction heating type rice cooker in Embodiment 2 of this invention is demonstrated. The basic configuration of the electromagnetic induction heating rice cooker in the present embodiment is the same as that of the electromagnetic induction heating rice cooker in the first embodiment, but the protective frame body 14 has a thickness of 0.4 mm in advance. A coated steel plate 22 is used, and a polyester-based resin is coated on the surface facing the rice cooker pan 9 to form a coating film 23 having a thickness of 20 μm.

  To the coating film 23, 0.1 to 1% by weight of silicone oil is added as a lubricating substance.

  In addition, the rice cooker pan 9 has a surface roughness Ra of 0.5 to 3 μm by sandblasting on the outer surface of the magnetic metal 17 constituting the outer layer of the base material of the rice cooker pan 9 as in the first embodiment. Then, a roughened surface is formed by adjusting so that a silicone / epoxy heat-resistant paint is applied so that the film thickness is about 30 μm after film formation, and the film is baked at 200 ° C. for 15 minutes. 1 wt% of polytetrafluoroethylene (PTFE) is added to the coating film 21.

  Here, the protective frame cylinder 14 is provided with a polyester-based coating film 23 having a thickness of 20 μm, and the protective frame cylinder prepared by adding 0 wt% and 1.5 to 3 wt% silicone to the coating film 23. As a comparative example, an electromagnetic induction heating rice cooker equipped with 14 was used as a comparative example, and a comparative experiment with an electromagnetic induction heating rice cooker equipped with the protective frame body 14 in the second embodiment was performed.

  Damage to the outer surface coating film of the rice cooker pan 9 when the rice cooker pan 9 added with the amount of PTFE added to the outer surface coating film of the rice cooker pan 9 is put in and out of the main body 1, FIG. 3 shows the results of evaluating the roundness of the rice cooker pan 9 when scratches occur or when the rice is lying.

  In FIG. 3, when the rice cooker pan 9 for 5.5-cooking rice is repeatedly put into and out of the main body 1 of the electromagnetic induction heating rice cooker 100 times, the rice cooker pan 9 and the protective frame body 14 are scratched. The evaluation results are shown as follows: a case where a conspicuous flaw can be made is evaluated as x, a case where a conspicuous flaw can be formed is evaluated as Δ, and a case where a scar is hardly generated is evaluated as ◯.

Moreover, about the adhesiveness of the coating film 23 of the protective frame body 14, when 1 square is 1x1mm and 100 square cross-cut peeling evaluation is implemented and peeling is seen after tape peeling, peeling does not arise. The case was rated as ○.

  As shown in FIG. 4, when the amount of the lubricating material added to the coating film 23 of the protective frame cylinder 14 is less than that of the present embodiment, the scratches on the protective frame cylinder 14 are damaged. In the case where it is large, scratches do not occur, but there is a problem in the adhesion of the coating film 23 and good results cannot be obtained.

  From the above results, an appropriate amount of a lubricious substance must be added to the coating film 23 in order to suppress damage to the coating film 23 of the protective frame body 14 and to prevent panning. In order to obtain good results, it is important that the content is 0.1 to 1% by weight.

  As described above, the rice cooker pan for the electromagnetic induction heating rice cooker according to the present invention performs the roughening process on the surface of the magnetic metal constituting the outer layer of the pan base material, and applies the non-adhesive substance to the roughened surface. Because the heat-resistant coating film that has been added is processed, the coating film is not damaged when the rice cooker pan is put in and out, and it also has high durability, so the rice cooker pan of the electromagnetic induction heating rice cooker Useful as.

  In addition, since the protective frame body for the electromagnetic induction heating type rice cooker according to the present invention is treating the coating film in which the lubricating material is added to the surface of the metal layer constituting the base material, when the rice cooker pan is put in and out. Since the coating film is not damaged and has high durability, it is useful as a protective frame body for an electromagnetic induction heating rice cooker.

1 Body 9 Pot for Rice Cooker 13 Under Protection Frame (Protection Frame)
14 Protective frame body 17 Magnetic metal 21, 23 Paint film 22 Steel plate

Claims (2)

A main body, a rice cooker pan that is detachably stored in the main body, and a protective frame and a protective frame body that form a portion for storing the rice cooker pan; the rice cooker pan is made of a single-layer or multi-layer metal. The base metal is composed of a magnetic metal, and the surface of the magnetic metal is roughened, and the roughened surface is mainly composed of a heat-resistant resin and is necessary. An electromagnetic induction heating rice cooker characterized in that a mica, a pigment, and a glittering material are added according to the above, and a coating film containing 0.5 to 1.5% by weight of a lubricating substance is provided. When the protective frame body is made of metal and a rice cooker pan is mounted, a coating film is treated on the surface facing the rice cooker pan, and the coating film contains a lubricating substance of 0.1 to 0.1%. The electromagnetic induction heating rice cooker according to claim 1, wherein 1% by weight is added.

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