JP5391795B2 - Inner pan for electromagnetic induction heating type electric rice cooker - Google Patents

Description

  The present invention relates to the structure of an inner pot for an electromagnetic induction heating type electric rice cooker, particularly a pottery-type inner pot generally called a clay pot.

  Recently, electromagnetic induction heating provided with an inner pot, a rice cooker main body in which the inner pot is stored, and an induction heating coil that is arranged to face the outer peripheral surface of the inner pot and induction-heats the inner pot. Type electric rice cooker, wherein the inner pot is composed of a highly heat-stored ceramic (ceramic material), and the outer peripheral surface facing the induction heating coil when housed in the rice cooker body of the inner pot An electromagnetic induction heating type electric rice cooker in which an inner pot heating member made of a metal material capable of electromagnetic induction heating is joined to a portion is provided.

  In an inner pan used in such an electromagnetic induction heating type electric rice cooker, for example, a lithium-based crystal is used on the inner peripheral surface side so that the inner peripheral surface side is glossy and smooth and does not cause sticking of rice or scorching. A glassy glaze made of a vitrified glass or the like is applied with a fluororesin (for example, see Patent Document 1).

  In the inner pot having such a configuration, when the rice cooking operation is started by the ON operation of the rice cooking start switch, a high-frequency current is supplied to the induction heating coil according to a predetermined procedure. And by the alternating magnetic field which generate | occur | produces in the said induction heating coil, the inner pot heating member of the inner pot outer peripheral part facing the same induction heating coil couple | bonds so that electromagnetic induction is possible, and an eddy current flows.

  And the inner pot heating member generates heat by Joule heat due to this eddy current, the heat is transmitted to the inner pot, and the vitreous glaze layer applied to the inner peripheral surface side of the inner pot, or the fluororesin Heat rice and water through the coating layer. At this time, part of the heat is transferred from the bottom part of the inner pot to the side wall part through the inner pot base material, and the entire inner pot is warmed to uniformly heat rice and water.

  Moreover, since a glassy glaze or fluororesin coating is given to the inner peripheral surface of an inner pot, since a certain amount of water generation is ensured, the inner pot to which rice cannot adhere easily is obtained.

  However, in the case of only the above-mentioned glaze layer, aside from the non-water-passing function, it was never satisfactory for avoiding sticking or burning of rice.

  On the other hand, in the case of the structure coated with fluororesin, the effect of preventing scorching etc. is much higher than in the case of the glaze layer, but the fluororesin is easily peeled off from the ceramic substrate surface as it is, and it is durable and reliable. There was a problem lacking.

  Therefore, in response to such a situation, for example, the surface of the ceramic pan is roughened by sandblasting, and then an alumina film (ceramic film) containing a metal oxide is formed on the top, and the alumina film is interposed through the alumina film. There has also been proposed a technique in which a fluororesin film is formed by applying a fluororesin on the upper surface side and baking it (see, for example, Patent Document 2).

  According to such a configuration, since the alumina film is formed after sandblasting the surface of the ceramic pan, the adhesion of the alumina film to the ceramic pan is increased, so the ceramic pan and the fluororesin Can also be improved to some extent.

JP-A-2005-413 JP 2008-279083 A

  However, in the case of the configuration of the above-mentioned Patent Document 2, even if the adhesion between the alumina film and the ceramic pan is improved, alumina is a ceramic to the last, and even if a metal is mixed, a characteristic equivalent to that of a metal cannot be produced. . Therefore, it is difficult to say that the adhesion to the ceramic pan is sufficiently high. In particular, if the target ceramic pan is in an unglazed state, and has a glaze layer on its surface, the adhesion is less likely to improve due to the low bonding force between the glaze layer and the alumina film (easy to peel off). . The fluororesin film is merely coated on the alumina film, and even if it is finally fired, reliable adhesion is not always maintained between the two. Therefore, there still remains a problem that the adhesion state is not stable and is easily peeled off.

  In addition, in order to form a ceramic film such as alumina on the surface of the ceramic pan, it is necessary to perform thermal spraying with a narrow width using an expensive and large-scale thermal spraying machine such as a plasma spraying machine or a metallicon spraying machine. Moreover, it cannot be sprayed using an inexpensive arc sprayer.

  Furthermore, the alumina film containing a metal is more expensive than the case of the glaze layer, and when it is intended to realize non-water permeability of the inner pot body, the inner pot itself is also expensive. In addition, in that case alone, a sufficient non-water-permeable function cannot be ensured.

  By the way, in such an inner pot for rice cooking, even if the said inner pot consists of ceramic-type base materials, such as a clay pot, the water scale according to the amount of rice cooking is required in order to show an appropriate amount of water.

  This water scale is provided by a method such as printing on the surface of the glaze layer or the fluororesin layer in the case where the glaze layer or the fluororesin layer prevents burning, etc. ) Is easy to disappear.

  On the other hand, in the case where the fluororesin film is formed through the alumina film, it is conceivable that the clear fluororesin is coated after printing on the alumina film surface. By doing so, there is an advantage that it will not disappear even after many years of use (wear).

  However, in this latter case, the surface of the ceramic pan is roughened by sandblasting in order to increase the degree of adhesion of the fluororesin (an anchor effect after application) as described above, and then an alumina film is formed by thermal spraying. As a result, irregularities corresponding to the roughened surface on the ceramic pan side are also formed on the surface of the formed alumina film, and there is a problem that proper printing cannot be performed as it is. The same applies to the case where, for example, the fluororesin film has a two-layer structure of a primer coat layer and a top coat layer, and scale printing is performed on the surface of the primer coat layer.

The invention of the present application was made to solve such a problem in the formation of a water scale. As described above, the base portion of the inner pot is formed of ceramics, and a predetermined amount is formed on the inner peripheral surface of the base of the inner pan. A glaze layer is formed, and a metal sprayed layer is formed thereon. Then, a fluororesin coat layer is formed via the metal spray layer. In that case, the metal spray layer is formed by roughening the surface of the glaze layer and forming a metal spray layer after forming an uneven surface. An uneven surface is formed on the surface of the glaze layer along the uneven surface of the glaze layer, and a fluorine resin coating layer is provided on the surface of the uneven metal sprayed layer using the uneven portion. This increases the degree of adhesion of the fluororesin coat layer to the metal spray layer, and improves the reliability and durability of the rice sticking and non-sticking functions.

Furthermore, in that case, the top part of the convex part on the metal sprayed layer side is smoothed substantially flat, and after the predetermined water scale printing is performed using the substantially flat top part surface, the fluororesin coat layer is formed. Alternatively, the first fluororesin coat layer is formed on the surface of the metal spray layer having the unevenness in a state where the first fluororesin coat layer is uneven along the uneven surface of the same surface. By forming the second fluororesin coat layer after performing a predetermined water scale printing using the flat top surface, the degree of adhesion of the fluororesin coat layer itself to the metal spray layer is increased and clear. it is an object to provide an inner pot of the electromagnetic induction heating type electric rice dexterity that the printing of water scale and possible.

  In order to achieve the above object, the present invention is configured with the following problem solving means.

(1) This invention is claimed in claim 1, made of pottery forming a glaze layer on the inner peripheral surface side and the outer peripheral surface of each of the surfaces, the inner peripheral surface side of the 該焼thereof, glaze layers of the inner peripheral surface The surface of the metal layer is roughened to form an uneven surface, and then a metal spray layer is provided to form an uneven surface along the uneven surface of the glaze layer surface on the surface of the metal spray layer. the same uneven portions provided with a fluororesin coating layer using the surface of the sprayed layer, an electromagnetic induction heating type electric rice cooker formed by providing a heating element for electromagnetic induction heating at a predetermined position on the outer peripheral surface of the pottery The top of the uneven portion on the surface of the metal spray layer on the inner peripheral surface side of the ceramic product is substantially flat with a large number of recessed portions having a predetermined depth remaining between the plurality of convex portions. are smoothed, the fluorine resin coating layer, the top of the large number of projections substantially flat Through the smoothing processed uneven portion with being coupled to the metal thermal sprayed layer, water scale is printed on top of a number of protrusions substantially flat of the fluorine resin coating layer inside of the metal sprayed layer It is characterized by that.

According to such a configuration, the fluororesin coat layer is formed on the surface of the glaze layer on the inner peripheral surface of the inner pot via the metal spray layer, and rice and water are interposed via the metal spray layer and the fluororesin coat layer. since contact with the non-adhesive becomes high for much rice inner bowl inner peripheral surface in comparison with the case where through only the glaze layer in contact with the rice and water, sticking of rice, scorching is less likely to occur.

In addition, when forming a metal sprayed layer on the surface of the glaze layer on the inner peripheral surface of the inner pot, the surface of the glaze layer is roughened to form an uneven surface, and then a metal sprayed layer is provided, thereby providing an inner pot base The surface of the metal sprayed layer is formed with an uneven surface along the uneven surface of the glaze layer , and the metal sprayed surface is formed on the surface of the metal sprayed layer with the unevenness. By providing the fluororesin coat layer using the uneven portions on the surface of the layer, the bonding force of the fluororesin coat layer to the metal sprayed layer is also improved.

  Moreover, in that case, the protrusions of the concavo-convex portions on the surface of the metal sprayed layer are smoothed in a substantially flat manner in a state in which a large number of concave portions having a predetermined depth are left between the plurality of convex portions only at the tops. The fluororesin coat layer is configured to be bonded to the metal sprayed layer through an uneven portion in which the top of the convex portion is smoothed substantially flat, and the metal sprayed layer inside the fluororesin coat layer. A water scale is printed on the top surface smoothed into a substantially flat shape of a large number of convex portions on the surface.

For this reason, the adhesion property of the ink at the time of water scale printing is improved, the printing operation is facilitated, and clear printing is possible. In addition, pinholes are not generated due to the penetration of random protrusions with different heights, while achieving a reliable engagement force by engaging the coating of the fluororesin coating layer with the metal spray layer. The

Also, inside the full fluororesin coating layer printing of water scale is applied, and fluorine resin coating layer, (good binding) with any馴good only glaze and the fluororesin of the inner pot base side because it is coated on the inner pot inside peripheral surface via a metal sprayed layer, improved degree of adhesion greater than the conventional, be abrasion of the printed water scale is prevented course, fluororesin coating layer itself Is less likely to be peeled off, and is much more reliable than the fluororesin coating layer of Patent Document 2 described above .

  Further, unlike the ceramic film such as alumina, the metal sprayed layer can be easily sprayed by a simple and inexpensive arc spraying machine. Therefore, the manufacturing cost is also reduced.

(2) This invention is claimed in claim 2, made of pottery forming a glaze layer on the inner peripheral surface side and the outer peripheral surface of each of the surfaces, the inner peripheral surface side of the 該焼thereof, glaze layers of the inner peripheral surface The surface of the metal layer is roughened to form an uneven surface, and then a metal spray layer is provided to form an uneven surface along the uneven surface of the glaze layer surface on the surface of the metal spray layer. first by using the same concavo-convex portion on the surface of the sprayed layer, with Keru set the fluorine resin coating layer of the second two-layer structure, the heating member for the electromagnetic induction heating at a predetermined position on the outer peripheral surface of the pottery a inner bowl for electromagnetic induction heating type electric rice cooker formed by providing a convex portion top portions of the concavo-convex portion of the metal sprayed layer surface within the pottery peripheral surface side, a plurality of predetermined depth between a plurality of protrusions while leaving recesses are smoothed to a substantially flat, the sprayed metal layer side first fluorine resin-coated layer The plurality apex of the convex portion of is coupled to the metal thermal sprayed layer through the uneven portion of the smoothing treated metal sprayed layer surface in a substantially flat, the first fluorine resin surface with the metal spray also coat layer An uneven portion is formed along the uneven portion on the surface of the layer, and a water scale is printed on tops of a plurality of substantially flat convex portions of the first fluororesin coat layer .

According to such a structure, the fluororesin coat layer of the 1st, 2nd two-layer structure is formed in the surface of the glaze layer of the inner peripheral surface of the inner pot via the metal spray layer, and the metal spray layer and Since it comes into contact with rice and water through the first and second two-layer fluororesin coat layers, it is far less than rice on the inner peripheral surface of the inner pot compared with the case where it comes into contact with rice and water only through the glaze layer. The stickiness becomes high, and sticking of rice and scorching are less likely to occur.

In addition, when forming a metal sprayed layer on the surface of the glaze layer on the inner peripheral surface of the inner pot, the surface of the glaze layer is roughened to form an uneven surface, and then a metal sprayed layer is provided, thereby providing an inner pot base. The surface of the metal sprayed layer is formed with an uneven surface along the uneven surface of the glaze layer, and the metal sprayed surface is formed on the surface of the metal sprayed layer with the unevenness. By providing the first fluororesin coat layer and the second fluororesin coat layer by using the uneven portions on the surface of the layer, the metal sprayed layers on the first fluororesin coat layer and the second fluororesin coat layer respectively. It is designed to improve the bond strength.

  Moreover, in that case, the protrusions of the concavo-convex portions on the surface of the metal sprayed layer are smoothed in a substantially flat manner in a state in which a large number of concave portions having a predetermined depth are left between the plurality of convex portions only at the tops. The first fluororesin coat layer is configured to be bonded to the metal sprayed layer through an uneven portion having a top portion of the convex portion smoothed to be substantially flat, and the first fluororesin coat layer The convex portion of the first fluororesin coat layer in which the top of the convex portion is formed substantially flat corresponding to the top surface smoothed into a substantially flat shape of a large number of convex portions on the surface of the inner metal spray layer. A water scale is printed on the top of the film, and a second fluororesin coat layer is formed thereon.

For this reason, the adhesion property of the ink at the time of water scale printing is improved, the printing operation is facilitated, and clear printing is possible. In addition, while realizing a reliable engagement force by engaging the coated first fluororesin coating layer with the concave portion of the metal sprayed layer, the occurrence of pinholes due to the penetration of random convex portions having different heights is avoided. The

In addition, the second fluororesin coat layer to be finally coated is bonded to the metal sprayed layer via the uneven portion on the surface of the first fluororesin coat layer, and the first fluororesin coat layer located on the inner side thereof. Water scale printing is applied to the substantially flat top of the convex portion of the fluororesin coat layer, and the first fluororesin coat layer is familiar with both the glaze on the inner pot base side and the fluororesin. It is coated on the inner peripheral surface of the inner pan through a good (bonding) metal spray layer, so that the adhesion level is greatly improved compared to the conventional method, and the printed water scale is prevented from being worn. Of course, both the first and second fluororesin coat layers are less likely to be peeled off, and are much more reliable than the fluororesin coating layer of Patent Document 2 described above.

Further, unlike the ceramic film such as alumina, the metal sprayed layer can be easily sprayed by a simple and inexpensive arc spraying machine. Therefore, the manufacturing cost is also reduced.

(3) Invention of Claim 3
The present invention is characterized in that a through hole state is formed between the printing portion and the printing portion of the water scale printing surface in the configuration of the invention of the second aspect.

As in the configuration of the invention of the second aspect, in the metal sprayed layer having an uneven portion, and only the top of the convex portion of the uneven portion is smoothed to be substantially flat, the top on the surface side is many flat. A large number of concave portions are formed between the convex portions of the first fluororesin coating layer, and correspondingly, a large number of convex portions having a substantially flat top portion and a plurality of convex portions having a substantially flat top portion are formed on the surface of the first fluororesin coat layer. A large number of recesses are formed between the two.

When printing for forming the water scale is performed, the printing ink adheres only to the upper surface of the convex portion and the periphery of the upper surface of the convex portion where the top portion is substantially flat, while the ink is applied to the concave portion between them. Does not adhere.

Accordingly, a large number of pinhole-shaped through holes are formed between the printing portions (ink adhering portions) of the printing surface, and the same printing surface is also used during the fluororesin coating for forming the second fluororesin coating layer. A sufficient engagement effect (anchor effect) due to the penetration and filling of the fluororesin into the recesses on the surface of the first fluororesin coat layer is exhibited through the through-hole of the first fluororesin coat layer, The degree of adhesion to the first fluororesin coat layer is reliably improved, and the peel strength of the second fluororesin coat layer is also greatly improved.

  As a result of the above, according to the present invention, compared to the conventional inner pot, the inner pot made of ceramics for the electromagnetic induction heating type electric rice cooker that realizes the cooking performance of delicious rice that sticks for a long time and does not cause burning Therefore, it is possible to realize water scale printing that is clearer and better-looking.

It is a figure which shows the whole cross-section of the inner pot for electromagnetic induction heating type | formula rice cookers which concern on embodiment of this invention. It is sectional drawing which expands and shows the structure of the side wall part of the inner pot. It is sectional drawing which expands and shows the structure of the principal part (A part of FIG. 1) of the side wall part of the inner pot.

  1-3 has shown the structure of the inner pot for electromagnetic induction heating type | formula rice cookers which concern on embodiment of this invention.

  This inner pot 1 is an inner pot for rice cooking generally referred to as an earthen pot as already described. For example, the inner pot main body (base body) 1a to 1d shown in FIG. 1 has a high heat-resistant temperature during sintering, It is made of a cordierite-based pottery material with good heat storage during heat retention, and is formed into a bottomed cross-sectional shape having a hill portion 1e and a mouth edge portion 1f as shown.

  A first heating member 2a is provided on the inside of the hill portion 1e of the bottom portion 1a, and a second heating member 2b is provided on a corner portion 1b having a rounded surface shape extending from the hill portion 1e of the bottom portion 1a to the side wall portion 1c. Bonded and integrated.

  Each of the first and second heating members 2a and 2b is capable of self-heating by an eddy current induced by an induction heating coil (work coil) on the electric rice cooker main body (not shown), for example, induction heating such as silver paste. It consists of a sheet.

  And this inner pot 1 is arrange | positioned so as to oppose the said 1st, 2nd heating members 2a and 2b of the electric rice cooker main body which is not shown in figure which the same inner pot 1 is accommodated, and the inner pot 1 accommodated. In the electric rice cooker body of the electromagnetic induction heating type electric rice cooker provided with an induction heating coil for induction heating the inner pot 1 stored therein via the first and second heating members 2a, 2b. Used as a storage set.

  Then, in the state where the inner pot 1 is stored and set in the electric rice cooker body, for example, when the rice cooking operation is started by an ON operation of the rice cooking start switch or the like, a high frequency current is supplied to the induction heating coil according to a predetermined procedure. Then, due to the alternating magnetic field generated in the induction heating coil, the first and second heating members 2a and 2b facing the induction heating coil are coupled so as to be capable of electromagnetic induction, and an eddy current flows.

  The first and second heating members 2a and 2b generate heat due to the Joule heat generated by the eddy current, and the heat is transmitted to the inner pot 1 inside the first and second heating members 2a and 2b. The rice and water in the inner pot 1 are heated. At this time, part of the heat is transferred from the bottom 1a of the inner pot 1 to the corner 1b, from the corner 1b to the side wall 1c, and from the side wall 1c to the opening 1d through the main body (base) of the inner pot 1, The whole of 1 is heated and the rice and water in the inner pot 1 are heated uniformly.

  In addition, a heat retaining heater is provided on the outer periphery of the side wall 1c as necessary. And this side wall part 1c is thicker than the said bottom part 1a and the corner part 1b, and is comprised so that the thermal storage property at the time of heat retention may become high.

  By the way, as described above, even in the case of the conventional inner pot, surface treatment such as glaze application or fluororesin coating is applied to the inner peripheral surface of the inner pot. The purpose is to suppress water absorption into the inner pot, and the purpose of sticking rice and scorching rice. I was never satisfied with avoiding stickiness and scorching.

  On the other hand, in the case of a configuration coated with a fluororesin, the effect of preventing scorching etc. is much higher than in the case of a glaze layer, but the fluororesin is easily peeled off from the surface of the ceramic substrate and lacks durability and reliability. There was a problem.

  Therefore, in response to such circumstances, for example, the surface of the ceramic pan is roughened by sandblasting, and then an alumina film containing a metal oxide is formed on the top, and fluorine is formed on the upper surface side through the alumina film. There has also been proposed a film in which a fluororesin film is formed by applying and baking a resin.

  According to such a configuration, since the alumina film is formed after sandblasting the surface of the ceramic pan, the adhesion of the alumina film to the ceramic pan is increased, so the ceramic pan and the fluororesin Can also be improved to some extent.

  However, in the case of this configuration, even if the adhesion between the alumina film and the ceramic pan is improved, alumina is a ceramic to the last, and even if a metal is mixed, a characteristic equivalent to that of a metal cannot be produced. Therefore, it is difficult to say that the adhesion to the ceramic pan is sufficiently high. In particular, if the target ceramic pan is in an unglazed state, if the surface has a glaze layer, the degree of adhesion is more difficult to improve. Further, in the case of the same configuration, the fluororesin film is merely applied on an alumina film that is a ceramic, and even if finally fired, reliable adhesion and bondability between them are not necessarily obtained ( The anchor effect is not always maintained. Therefore, the stability of the fluororesin layer adhesion state is still lacking, and the problem of the fluororesin layer peeling remains.

  In addition, in order to form a ceramic film such as alumina on the surface of the ceramic pan, it is necessary to perform thermal spraying with a narrow width using an expensive and large-scale thermal spraying machine such as a plasma spraying machine or a metallicon spraying machine. Moreover, it cannot be sprayed using an inexpensive arc sprayer.

  Furthermore, the alumina membrane is more expensive than the glaze layer, and thus the inner pan itself is also expensive when attempting to achieve water-imperviousness of the inner pan body. In addition, water permeability is not sufficient.

  The present embodiment was made to solve the above-mentioned problems in forming the fluororesin coat layer and at the same time to solve the above-described problems in water scale printing. While forming the base part of 1 with a highly heat-resistant cordierite-type ceramics representative of clay pots and forming the glaze layer 4 on the surface thereof, while maintaining the non-water permeability of the inner pot 1 As a method for effectively preventing sticking and scorching of rice, for example, as shown in FIGS. 2 and 3, the surface of the glaze layer 4 is subjected to sandblasting, and an aluminum metal sprayed layer 5 is formed thereon.

  Then, after a predetermined level of smoothing is applied to the surface of the aluminum sprayed layer 5, the top of the aluminum sprayed layer 5 is left with a concave portion between the convex portion having a substantially flat top and a convex portion. By sequentially forming a fluororesin primer coat layer (first fluororesin coat layer) 6a and a fluororesin topcoat layer (second fluororesin coat layer) 6b, the adhesion and bonding of the fluororesin to the aluminum sprayed layer 5 are achieved. While increasing the force and preventing sticking and scorching of rice, the reliability and durability of the rice are improved, while the top portion of the primer fluororesin coating layer 6a corresponding to the convex portion of the aluminum sprayed layer 5 is substantially flat. It aims at providing the inner pot for electromagnetic induction heating type electric rice cookers which realized the clear water scale without a blur by printing the water scale on a part side.

  That is, in the inner pot 1 of the present embodiment, as shown in FIGS. 2 and 3, for example, each part of the uncooked inner pot main body (base body) extending from the bottom 1a to the opening 1d of the inner pot 1 shown in FIG. First, a lithianic glaze layer 4 having a desired thickness is formed on both the inner and outer peripheral surfaces (including the heating member 2a and 2b) and the inner pan body at low cost. Realize non-water permeability of the part. Thereafter, a predetermined sandblasting process is performed on the inner peripheral surface side portion (the portion where rice and water are accommodated) to roughen the surface of the glaze layer 4 to a predetermined roughness.

  Then, as a first base treatment for forming the fluororesin coating layers 6a and 6b to be described later, an aluminum metal is sprayed (sprayed) using a simple spraying machine such as an arc spraying machine, and the above An aluminum sprayed layer 5 having a desired thickness along the uneven surface (rough surface) formed by the sandblasting on the surface of the glaze layer 4 is formed. The aluminum sprayed layer 5 is produced with good adhesion by effectively adhering to and engaging with the irregular surface portion of the surface of the glaze layer 4 formed by the sandblasting. Then, the surface of the aluminum sprayed layer 5 having the same unevenness is further subjected to a smoothing process by glass bead shot processing as a second base treatment, and the surface is subjected to a predetermined smoothing level, for example, sandblasting as described above. Only the apex of the convex part of the uneven surface of the aluminum sprayed layer 5 with unevenness along the unevenness on the inner pan body side glaze layer 4 is scraped to eliminate random protrusions and increase the curvature of the top part (extremely In other words, it provides a necessary engagement force (anchor effect due to the recess) to the primer coat layer 6a of the fluororesin layer to be coated later, but does not cause unnecessary pinholes due to penetration. And smoothing to such an extent that printing ink rides better.

  Then, a fluororesin primer coat layer (first fluororesin coat layer) 6a is first formed on the aluminum sprayed layer 5 smoothed to such a level by the glass bead shot, and the primer coat layer 6a. Water scales 7, 7, and 7 are pad-printed on the surface of the protrusions. Thereafter, the fluororesin top coat layer 6b (second fluororesin coat layer) is formed thereon with a desired thickness thicker than that of the primer fluororesin layer coat layer 6a, and is baked, so that the rice is stuck and burnt. In addition, the preferred inner pot 1 is configured such that the fluororesin is hardly peeled off and the water scale is clear.

  In this case, the glaze layer 4 is applied after the lithia glaze is applied to the entire inner and outer peripheral surfaces of the unglazed inner pot main bodies (substrates) 1a to 1d after blasting to improve the adhesion. And then dried and then baked. Of course, this blasting process may or may not be performed, but if the glaze layer 4 is formed after the blasting process, the adhesion strength of the glaze layer 4 to the inner pot body is further increased.

  Further, as the glass beads for performing the glass bead shot, for example, those mainly composed of silica (SiO2) having a Mohs hardness of 3 to 8 (more preferably around 5.5) are employed.

  If the hardness is higher than this, the bent aluminum sprayed surface will be cut too much, and conversely if it is too low, the smoothing (cutting) effect will hardly occur.

  Also, unlike shot blasting with a metal material such as aluminum, the glass bead shot described above breaks the glass bead itself when a certain load is applied. A favorable shot effect of hitting and crushing works. Therefore, with the same glass bead shot, only the vicinity of the apex of the convex portion of the uneven surface of the uneven aluminum sprayed layer 5 along the uneven surface on the inner peripheral surface of the inner pan body that has been sandblasted as described above. When the shot processing is performed, the concave portion is not completely smooth as described above, but the concave portion is left in the shape in which the convex portion is nearly flat, and is sufficiently caused by the penetration of the fluororesin material. The engagement effect (anchor effect) due to mutual coupling is exhibited, and the degree of adhesion of each is improved with certainty. In addition, since no pinholes are generated in the fluororesin coat layers 6a and 6b, there is no rust (rust) due to the exposure of the aluminum material on the lower surface side or the penetration of water into the aluminum material part.

  In addition, for example, when performing transfer printing (pad printing) for forming a water scale, for example, printing ink adheres to the convex portion and the peripheral portion of the fluororesin primer coat layer 6a whose top portion is almost flat. On the other hand, the ink does not adhere in the recess (refer to the reference numerals 7, 7... In FIG. 3). Therefore, it is possible to perform clear water scale printing that is clear and has no bleeding more reliably.

  Also, during the fluororesin coating for forming the second fluororesin coat layer, the first fluororesin coat is passed through the pinhole-shaped through hole formed between the printing parts (ink adhesion parts) on the same printing surface. Since a sufficient engagement effect (anchor effect) due to the penetration and filling of the fluororesin into the recesses on the surface of the layer is exhibited, the first fluororesin coat of the second fluororesin coat layer side fluororesin The degree of adhesion to the layer is reliably improved.

  Further, since the glaze layer 4 and the aluminum sprayed layer 5 have different hardnesses (the glaze layer 4 is harder), as described above, the surface of the glaze layer 4 is roughened by a hard sandblasting process, and the aluminum sprayed layer 5. The appropriate thickness of the fluororesin primer coat layer 6a can be achieved more effectively and stably by using appropriate surface treatment methods with appropriate soft glass bead shots and appropriate surface treatment methods. The fluororesin top coat layer 6b can be provided.

  Moreover, the aluminum sprayed layer 5 is easy to bond with the glaze layer 4 of the inner pot 1 and has a lower hardness than a conventional ceramic film made of alumina or the like.

  Further, unlike the conventional ceramic film such as alumina, the aluminum sprayed layer 5 can be easily sprayed by a simple and inexpensive arc spraying machine. Therefore, the manufacturing cost can be reduced.

  DESCRIPTION OF SYMBOLS 1 is an inner pot, 1a is an inner pot bottom part, 1b is an inner pot corner part, 1c is an inner pot side wall part, 1d is an inner pot opening part, 2a is a 1st heating member, 2b is a 2nd heating member, 4 is The glaze layer, 5 is an aluminum sprayed layer, 6a is a fluororesin primer coat layer, and 6b is a fluororesin topcoat layer.

Claims (3)

The surface of the glaze layer on the inner peripheral surface side is roughened to form an uneven surface on the inner peripheral surface side of the ceramic product. Then, by providing a metal spray layer, an uneven surface along the uneven surface of the glaze layer surface is formed on the surface of the metal spray layer, and the uneven portion is used on the surface of the metal spray layer with the unevenness. provided with a fluorine resin coating layer, an inner bowl for electromagnetic induction heating type electric rice cooker formed by providing a heating element for electromagnetic induction heating at a predetermined position on the outer circumferential surface of the pottery, in the pottery peripheral surface The top of the convex portion of the concavo-convex portion on the surface of the metal sprayed layer on the side is smoothed in a substantially flat manner with a plurality of concave portions having a predetermined depth remaining between the plurality of convex portions, and the fluororesin coat layer The top of the plurality of convex portions is the above through the concavo-convex portion smoothed to be substantially flat Together are coupled to the genus sprayed layer, an electromagnetic induction heating type electric rice, characterized in that water scale on top of the substantially flat plurality of convex portions of the fluororesin coating layer inside of the metal sprayed layer is printed Dessert inner pot. The surface of the glaze layer on the inner peripheral surface side is roughened to form an uneven surface on the inner peripheral surface side of the ceramic product. Then, by providing a metal spray layer, an uneven surface along the uneven surface of the glaze layer surface is formed on the surface of the metal spray layer, and the uneven portion is used on the surface of the metal spray layer with the unevenness. first, with Keru set the fluorine resin coating layer of the second two-layer structure, the electromagnetic induction heating type electric rice cooker formed by providing a heating element for electromagnetic induction heating at a predetermined position on the outer peripheral surface of the pottery The top of the concavo-convex portion on the surface of the metal spray layer on the inner peripheral surface side of the ceramic product is smoothed substantially flat with a plurality of concave portions having a predetermined depth remaining between the plurality of ridges. are processed, the sprayed metal layer side first fluororesin coat layer, the top of the plurality of protrusions is substantially flat Through the uneven portion of the smoothing treated metal sprayed layer surface is bonded to the metal thermal sprayed layer, the irregular portion along the uneven portion of the surface of the first fluorocarbon resin coating layer of the metal sprayed layer on the surface of Is formed, and a water scale is printed on tops of a plurality of substantially flat convex portions of the first fluororesin coat layer . An inner pot for an electromagnetic induction heating type electric rice cooker, wherein: The inner pot for an electromagnetic induction heating electric rice cooker according to claim 2 , wherein a through-hole state is formed between the printing portion and the printing portion of the water scale printing surface .

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