JP2023006263A - Cooker - Google Patents

Abstract

To improve the browning of food cooked in a grill chamber.SOLUTION: A cooker has a grill chamber. The grill chamber comprises a body case in which a heating space for storing and heating food is formed, and a heater for heating food. At least a part of a surface of the body case on the heating space side is composed of an enamel member formed by covering a metal member with a vitreous layer. The enamel member has a color tone with a lightness L* of 27 or more and less than 31 in the L*a*b* color system.SELECTED DRAWING: Figure 3

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat cooker for storing and cooking foodstuffs, and more particularly to a heat cooker provided with a grill chamber.

Conventionally, this type of heat cooker is known to have a grill chamber having a heating space in which foodstuffs such as fish are accommodated and cooked. For example, the grill chamber of the heating cooker disclosed in Patent Literature 1 includes a main body case that accommodates foodstuffs inside and is heated by a heater that is arranged outside. A portion of the inner surface of the body case is provided with an enamel member formed by covering a metal member with a black glass layer.

JP 2021-003493 A

In the case of the grill chamber of the heating cooker of Patent Document 1, the bottom surface on the heating space side of the main body case of the grill chamber has a black enamel layer, so that the inside of the heating space can be easily cleaned, and Heating efficiency can be improved. Furthermore, there is a demand for browning of cooked foodstuffs, and there is a demand for improving the browning color of foodstuffs cooked in a grill chamber in conventional heat cookers.

Accordingly, an object of the present disclosure is to solve the above problems and to provide a cooking device capable of improving the browning color of food cooked in a grill chamber.

To achieve the above object, a heating cooker according to the present disclosure is a heating cooker having a grill chamber, wherein the grill chamber includes a main body case inside which is formed a heating space for storing and heating foodstuffs. and a heater for heating food, at least part of the surface of the body case on the heating space side is composed of an enamel member formed by covering a metal member with a vitreous layer, and the enamel member is L It has a color tone with a lightness L* of 27 or more and less than 31 in the *a*b* color system.

ADVANTAGE OF THE INVENTION According to this invention, it is a heat cooker.

1 is an exploded perspective view of a heating cooker according to an embodiment of the present disclosure; FIG. 1 is a partial perspective view of a heating cooker showing an example of a state in which a grill chamber according to an embodiment of the present disclosure is arranged; FIG. 1 is a perspective view of a grill warehouse according to an embodiment of the present disclosure with the grill door omitted; FIG. FIG. 4 is an exploded perspective view of the upper heater of the grill chamber of FIG. 3; 1 is a perspective view of a grill door and related parts according to one embodiment of the present disclosure in an open position; FIG. FIG. 2 is an image diagram showing an example of an enamel member made of a mixed glaze included in a main body case of a grill storage according to an embodiment of the present disclosure; 5 is a graph showing an example of a color tone, which is lightness L* displayed in the L*a*b* color system, for an enamel member made of a mixed glaze according to an embodiment of the present disclosure. 8 is a graph showing an example of reflection characteristics of the enamel member made of the mixed glaze of FIG. 7. FIG. 8 is a graph showing the ratio of white vitreous surface area on the surface of the enamel member with the mixed glaze of FIG. 7; A grill chamber (a) comprising an enamel member made of mixed glaze of Example 1 according to one embodiment of the present disclosure, a grill chamber (b) comprising a black enamel of Comparative Example 1, and a white enamel of Comparative Example 2. It is an appearance photograph of the bread cooked using each of the provided grill chamber (c).

According to the first aspect of the present disclosure, there is provided a heating cooker having a grill chamber, wherein the grill chamber includes a main body case in which a heating space for storing and heating foodstuffs is formed, and a heater for heating the foodstuffs. , At least part of the surface of the main body case on the heating space side is composed of an enamel member formed by covering a metal member with a vitreous layer, and the enamel member has L*a*b* color specifications. To provide a heating cooker having a color tone with a system lightness L* of 27 or more and less than 31.

According to this aspect, it is possible to provide a cooking device capable of improving the color of the food cooked in the grill.

According to the second aspect of the present disclosure, there is provided a heating cooker having a grill chamber, wherein the grill chamber includes a main body case in which a heating space for storing and heating foodstuffs is formed, and a heater for heating the foodstuffs. , At least part of the surface of the main body case on the heating space side is composed of an enamel member formed by covering a metal member with a vitreous layer, and the enamel member is in the near-infrared wavelength region (center Provided is a heat cooker having an infrared reflectance of 11.5% or more and less than 12.6% at a wavelength of 1000 nm.

According to the third aspect of the present disclosure, there is provided a heating cooker having a grill chamber, wherein the grill chamber includes a main body case in which a heating space for storing and heating foodstuffs is formed, and a heater for heating the foodstuffs. , At least part of the surface of the main body case on the heating space side is composed of an enamel member formed by covering a metal member with a vitreous layer, and the enamel member is in the visible light wavelength region (center wavelength 750 nm) has a visible light reflectance of 5.3% or more and less than 6.5%.

According to the fourth aspect of the present disclosure, there is provided a heating cooker having a grill chamber, wherein the grill chamber includes a main body case in which a heating space for storing and heating foodstuffs is formed, and a heater for heating the foodstuffs. , At least part of the surface of the main body case on the heating space side is composed of an enamel member formed by covering a metal member with a vitreous layer, and the vitreous layer is composed of black vitreous and white and a white vitreous substance on the surface of the enamel member, wherein the surface area of the white vitreous substance is 1% or more and less than 9% of the surface area of the enamel member.

According to a fifth aspect of the present disclosure, the vitreous layer includes black vitreous and white vitreous, and is configured such that the white vitreous is interspersed in the black vitreous. A heat cooker according to any one of the first to third aspects is provided.

According to a sixth aspect of the present disclosure, the heating device according to any one of the first to fifth aspects, wherein the enamel member is formed to cover at least a portion of the side surface of the main body case on the heating space side. Provide cooking utensils.

A seventh aspect of the present disclosure provides the cooker according to any one of the first to sixth aspects, wherein the heater is arranged on the outer upper surface of the top plate of the main body case.

According to the eighth aspect of the present disclosure, the grilling chamber further includes a grill door closing the front opening and a slide rail, the slide rail being arranged outside the heating space or at the bottom of the main body case, and the grill door provides the heating cooker according to any one of the first to seventh aspects, which is connected to one end of a slide rail and configured to open and close the grill chamber by sliding movement of the slide rail.

According to a ninth aspect of the present disclosure, there is provided the cooker according to any one of the first to eighth aspects, wherein the side surface of the main body case on the heating space side has a portion that is not composed of the enamel member.

By appropriately combining any of the various embodiments described above, the respective effects can be obtained.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters and redundant descriptions of substantially the same configurations may be omitted. This is to avoid unnecessary verbosity in the following description and to facilitate understanding by those skilled in the art.

A heating cooker according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 9. FIG. The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure and are not intended to limit the claimed subject matter thereby. Also, in each drawing, each element is exaggerated for ease of explanation.
<Embodiment>

(overall structure)
An example of a heating cooker 1 according to an embodiment of the present disclosure will be described with reference to FIG. FIG. 1 is an exploded perspective view of a heating cooker 1 according to an embodiment of the present disclosure. In the drawing, the X, Y and Z directions respectively mean the width direction, depth direction and height direction of the heating cooker 1 .

In one embodiment, as an example, a built-in cooking device 1 that is used by being built into a cabinet of a system kitchen will be described. The heating cooker 1 may be a stationary type that is placed on a kitchen table and used, or a tabletop type that is placed on a table such as a dining table.

As shown in FIG. 1, a heating cooker 1 according to the present embodiment is an induction heating cooker and includes a housing 2 and a top plate 3 on which a cooking container such as a pot is placed. A plurality of induction heating coils (not shown) are arranged below the top plate 3 .

The top plate 3 includes a magnetic flux-permeable glass plate and is attached to the top of the housing 2 . The induction heating coil is arranged above the housing 2 , that is, near the lower surface of the top plate 3 . The cooking vessel placed on the upper surface of the top plate 3 is induction-heated by an induction heating coil.

A grill door 4 and a front panel 5 are attached to the front side of the housing 2 of the heating cooker 1 . The grill door 4 is attached to a grill chamber 6 housed inside the housing 2. - 特許庁On the front panel 5, the user can input information such as heating temperature and heating time to control heating.

(Grill storage)
Hereinafter, the grill storage 6 according to an embodiment of the present disclosure will be described with reference to FIGS. 2 to 5. FIG.

FIG. 2 is a partial perspective view of a heating cooker showing an example of a state in which grill chamber 6 according to one embodiment of the present disclosure is arranged. Moreover, FIG. 3 is a perspective view of the grill storage 6 according to one embodiment of the present disclosure in which the grill door 4 is omitted. Furthermore, FIG. 4 is an exploded perspective view of the upper heater 8 of the grill chamber 6 of FIG. FIG. 5 is a perspective view of the grill door 4 and related parts according to one embodiment of the present disclosure in an open position.

FIG. 2 shows the housing 2 with the top plate 3, induction heating coils, front panel 5, and associated components removed. As shown in FIG. 2, the grill chamber 6 is mounted in the left space 2a of the housing 2. As shown in FIG. Specifically, the internal space of the housing 2 is divided into a left space 2a and a right space 2b by partition walls 10a, 10b, and 10c. 2, the grill door 4 is omitted in order to show the inside of the grill chamber 6. As shown in FIG.

As shown in FIG. 3, the grill chamber 6 is a substantially rectangular parallelepiped unit. The grill chamber 6 includes a main body case 7 containing food to be cooked, a heater 8 for heating (grilling) the contained food, and a grill door 4 (not shown in FIG. 3, shown in FIG. 1) for closing the main body case 7. ) and slide rails 11a and 11b for pulling out the grill door 4.

Specifically, the main body case 7 of the grill chamber 6 has a substantially rectangular parallelepiped shape with a front opening 7c at the front end, and includes a left side wall 7a, a right side wall 7b, and a back plate 7d (not shown in FIG. 3). ), a top plate 7e, and a bottom plate 7f, which are integrated as one component. As shown in FIG. 3, the inside of the main body case 7 forms a heating space S in which foodstuffs are accommodated and heated. Further, the main body case 7 may include a cooking container, such as a grill pan 9, which can be put into and taken out of the heating space S through the front opening 7c. The food is stored in the heating space S of the main body case 7 of the grill chamber 6 while being placed on the grill plate 9 . A front end portion 9 a of the grill pan 9 can be detachably connected to the grill door 4 .

The heater 8 is installed on the outer upper surface of the top plate 7e of the main body case 7 of the grill chamber 6, as shown in FIGS. In the present embodiment, the heater 8 is a planar heater and a mica heater is used, but the heater is not limited to this. For example, the heater 8 may be a see-tzu heater. In addition, heaters may be installed not only on the outer upper surface of the top plate 7e of the main body case 7 but also on the outer side of the bottom plate 7f of the main body case 7 to heat the foodstuff in the heating space S by the upper and lower heaters. .

A portion of the top plate 7e of the main body case 7 that contacts the heater 8 is particularly susceptible to thermal deformation. In order to suppress this thermal deformation, as shown in FIG. 4, the top plate 7e of the main body case 7 is formed with a lattice structure 12 at the portion that contacts the heater 8 in this embodiment. Such a lattice structure 12 can suppress thermal deformation of the top plate of the main body case 7 by functioning as a reinforcing rib.

In the case of the present embodiment, the grill door 4 is configured to be movable in the front-rear direction (Y-axis direction) of the heating cooker 1 in front of the front opening 7c of the main body case 7, as shown in FIG. there is The grill door 4 may also include a cooking container connection portion 4a to which the front end portion 9a of the grill pan 9 is connected. As a result, by moving the grill door 4 to the front of the grill chamber 6, the grill pan 9 can be pulled out to the outside of the heating space S of the main body case 7, and the user can conveniently place the food to be cooked on the grill pan 9. It is possible to place or take out the cooked food from the grill pan 9. - 特許庁Further, as shown in FIG. 5 , the grill door 4 is provided with a viewing window 14 so that the user can check the food being heated in the heating space S without opening the grill door 4 .

Returning to FIG. 3, in this embodiment, slide rails 11a and 11b for pulling out the grille door 4 are arranged on lower outer sides of the side walls 7a and 7b of the main body case 7 so as to face each other. Here, the side walls of the main body case 7 mean both sides of the main body case 7 in the width direction of the heating cooker 1 (the X direction in FIG. 1). The slide rails 11a and 11b extend in the depth direction (the Y direction in FIG. 1) at the outer lower portions of the side walls 7a and 7b of the main body case 7, respectively, and can slide toward the front of the front opening 7c. can. As shown in FIG. 5, the grill door 4 is connected to the front ends of the slide rails 11a and 11b. slide to the side. Thus, the grill door 4 can open and close the grill chamber 6 by sliding the slide rails 11a and 11b.

Further, in the present embodiment, as shown in FIG. 2, the slide rails 11a and 11b are positioned outside the side walls of the body case 7 of the grill chamber 6, respectively, between the side walls 7a of the body case 7 and the partition wall 10a. , and between the side wall 7b and the partition wall 10b. Also, the present disclosure is not limited to this. For example, the slide rails 11 a and 11 b may be arranged at the bottom of the main body case 7 of the grill chamber 6 . By arranging the slide rails 11a and 11b outside the heating space S of the grill chamber 6 or on the bottom of the main body case 7 in this manner, radiant heat transfer from the side wall of the main body case 7 on the heating space S side is efficiently utilized. can do.

Moreover, as shown in FIG. 5, the grill chamber 6 may further include cooking container support members 13a and 13b that support cooking containers such as the grill pan 9 and the like. In this embodiment, the cooking vessel support members 13a and 13b are formed of rod-shaped members arranged outside the bottom plate 7f of the main body case 7 so as to face each other. Cooking container support members 13a and 13b are connected to grill door 4 at their front ends and can slide toward the front side of heating cooker 1 in the same manner as slide rails 11a and 11b. In this way, when the grill door 4 is pulled forward of the opening 7c and the grill chamber is opened, the cooking container such as the grill pan 9 is supported by the cooking container supporting members 13a and 13b and falls off. can be pulled out to the outside of the heating space S of the main body case 7.

(Findings on which this disclosure is based)
In a heat cooker, generally infrared rays with a wavelength of 2.5 μm to 30 μm are used for cooking food. In a grilling cooking utensil such as a grilling chamber, a cooking effect peculiar to grilling cooking is obtained by radiant heat transfer using far infrared rays, so it is desirable that the inner surface of the heating space of the grilling chamber has a high emissivity. For example, in the heating cooker described in Patent Document 1, the surface of the heating space side of the main body case of the grill chamber is an enameled member made of black glass (glaze) having a high emissivity to far infrared rays. I have.

In such a heating cooker, the surface of the main body case of the grill chamber on the side of the heating space is provided with a black enamel layer, whereby the infrared emissivity in the heating space is increased, and the heating efficiency of the grill chamber is improved. . However, when the infrared emissivity in the heating space of the grill chamber is high, it is difficult for the grilled food to be browned, and the cooking effect peculiar to grilled cooking may not be obtained.

Therefore, the present inventors have studied how to improve the browning color of food cooked in a grill chamber in a heat cooker, and have provided an enamel member in which the main body case that forms the heating space of the grill chamber has a predetermined color tone. The present inventors have found a configuration that improves the color of baked foodstuffs by providing them.

Hereinafter, the enamel member made of the mixed glaze included in the main body case 7 of the grill chamber 6 according to the embodiment of the present disclosure will be described in detail with reference to FIGS. 6 to 9 .

(Enamel parts with mixed glaze)
FIG. 6 is an image diagram showing an example of a mixed glaze enamel member included in a main body case of a grill according to an embodiment of the present disclosure.

Specifically, in the present embodiment, the main body case 7 of the grill chamber 6 is produced by forming (pressing, bending, etc.) a thin metal plate such as iron. At least a part of the left side wall 7a, the right side wall 7b, and the back plate 7d of the main body case 7 is formed by dipping the surface of a molded metal plate into a vitreous glaze containing silica (silicon dioxide) as a main component. After that, it has an enamel member formed through high-temperature firing treatment. At this time, the glaze used was a vitreous mixed glaze in which a black glaze and a white glaze were mixed. A black glaze may be formed, for example, by mixing a molten glass material with a Cu--Cr--Mn-based pigment, or by mixing a pigment such as iron oxide. A white glaze may be formed, for example, by mixing a titanium oxide-based pigment or a pigment such as alumina into a molten glass material. Also, the weight ratio of the white glaze to the black glaze in the mixed glaze is desirably 2% to 10%. Here, the weight ratio of the white glaze to the black glaze in the mixed glaze is, for example, when the mixed glaze has a weight ratio of 10%, the black glaze weighing 100 kg is mixed with the white glaze weighing 10 kg. means a mixed glaze obtained by In this embodiment, the weight ratio of the white glaze to the black glaze is set to 10% or less in order to prevent the pigment from kneading and separating and to form a more homogeneous enamel member.

As shown in FIG. 6, the main body case 7 is enamelized with a mixed glaze of a combination of a black glaze and a white glaze, so that at least a part of the surface on the heating space S side is enamelized with the mixed glaze. It has parts. The enamel member made of the mixed glaze is formed such that the glass layer covering the metal member includes black vitreous and white vitreous, and the white vitreous is scattered in the black vitreous. Note that FIG. 6 shows different colors and sizes from the actual enamel members in order to facilitate the explanation. As the weight ratio of white glaze to black glaze increases from 2% to 10%, the white vitreous increases in dispersion density with a generally constant average particle size. In the case of the present embodiment, as shown in FIG. 6, a part of the side surface of the main body case 7 on the side of the heating space S, for example, a part near the front opening 7c is not made of the enamel member. A part, for example a frame member 15, is arranged. As a result, the convenience and durability of attaching the grill chamber 6 can be maintained.

The enamel member on the heating space S side of the main body case 7 according to the present embodiment has a predetermined color tone by being formed of a mixed glaze that is a combination of black glaze and white glaze, and , has a predetermined reflectance. As a result, the infrared emissivity in the heating space S is adjusted, and the brown color of the food cooked in the grill chamber 6 can be improved. In addition, in order to widely brown the surface of the food cooked in the grill chamber 6, preferably, the enamel member made of mixed glaze is provided on the left side wall 7a and the right side wall 7b of the main body case 7 on the heating space S side, It is formed so as to cover at least part of the back plate 7d. However, the disclosure is not so limited. For example, the surfaces of the top plate 7e and/or the bottom plate 7f of the main body case 7 on the side of the heating space S can also be provided with enamel members.

The color tone of enamel parts formed from mixed glazes prepared by varying the weight ratio of white glaze to black glaze from 2% to 10% was measured. FIG. 7 is a graph showing an example of color tone, which is lightness L*, displayed in the L*a*b* color system for the enamel member made of the mixed glaze according to the embodiment of the present disclosure. FIG. 7A shows lightness L* displayed in the L*a*b* color system. FIG. 7(b) shows L*a*b of an enamel member made of mixed glaze with a weight ratio of 2% to 10% when the color of the enamel (black enamel) formed only by black glaze is used as the reference color. * Indicates lightness difference ΔL* displayed in a color system. As shown in the figure, the lightness L* expressed in the L*a*b* color system of the mixed glaze enamel member increases approximately in proportion to the weight ratio of the white glaze to the black glaze. In addition, the enamel member made of a mixed glaze with a weight ratio of 2% to 10% has a color tone in which the lightness L* displayed in the L*a*b* color system is about 27 or more and less than 31, and the weight ratio is The lightness difference ΔL* indicated by the L*a*b* color system between the enamel member with the mixed glaze of 2% to 10% and the black enamel was about 2.5 to 5.8. In the present embodiment, the white vitreous brightness L* of the enamel member is 90 or more, and the black vitreous brightness L* is less than 26. By interspersing a predetermined amount of white vitreous material in such a black vitreous material, the lightness L* of the enamel member made of the mixed glaze of the present embodiment is about 27 or more and less than 31.

In addition, in the L*a*b* color system, the color difference ΔE*ab can be calculated based on the measured value of the lightness L* of the object to be measured. As used herein, "color difference ΔE*ab" is a numerical value of color difference, and is adopted in JIS (JIS Z 8781-4: 2013), an arrangement by the Commission Internationale de l'Eclairage (CIE). means the distance between two points (two colors) existing in the L*a*b* color space (L*: lightness, a*, b*: chromaticity), which is the color system of . The color difference ΔE*ab is calculated by the following formula. In this specification, the wavelength range used for chromaticity calculation is 380 nm to 780 nm.

Here, ΔL* is the lightness difference between the reference color and the object to be measured, and Δa* and Δb* are the chromaticity differences between the reference color and the object to be measured. As a result of calculation based on the measurement results of lightness L* displayed in the L*a*b* color system shown in FIG. It was 3-6.

Next, the reflection characteristics of the enamel member with the mixed glaze were measured. FIG. 8 is a graph showing an example of reflection characteristics of the enamel member made of the mixed glaze of FIG. FIG. 8(a) shows the reflectance in the visible light wavelength region (center wavelength 750 nm) of the enamel member made of the mixed glaze. FIG. 8(b) shows the infrared reflectance in the near-infrared wavelength region (center wavelength 1000 nm) of the enamel member made of the mixed glaze. As shown, the reflectance of the enamel member with the mixed glaze increases roughly in proportion to the weight ratio of the white glaze to the black glaze. In addition, the enamel member made of mixed glaze with a weight ratio of 2% to 10% has a reflectance of about 5.3% or more and less than 6.5% in the visible light wavelength region with a center wavelength of 750 μm. It has a reflectance of about 11.5% or more and less than 12.6% for infrared rays in the outer wavelength region. In this embodiment, the white vitreous material of the enamel member has a reflectance of 80% or more at a central wavelength of 750 μm, and the black vitreous material has a reflectance of less than 5% at a central wavelength of 750 μm. By interspersing a predetermined amount of white vitreous material in such a black vitreous material, the enamel member made of the mixed glaze of the present embodiment has a visible light wavelength region with a center wavelength of 750 μm, and is about 5.3% As described above, the reflectance becomes less than 6.5%. Furthermore, in the present embodiment, the white vitreous material of the enamel member has a reflectance of 80% or more at a central wavelength of 1000 nm, and the black vitreous material has a reflectance of less than 11.4% at a central wavelength of 1000 nm. By interspersing a predetermined amount of white vitreous material in such a black vitreous material, the enamel member made of the mixed glaze of the present embodiment has a wavelength range of about 11.5 in the near-infrared wavelength region with a central wavelength of 1000 nm. % or more and less than 12.6%.

In this embodiment, the infrared rays emitted from the heater 8 are absorbed by the body case 7 in the grill chamber 6 . Next, in the body case 7 whose temperature has risen due to the absorption of infrared rays, infrared rays are radiated into the heating space S from the enamel member made of the mixed glaze on the surface on the heating space S side. The food contained in the heating space S is heated by the infrared rays. In the "thermal equilibrium state" where the temperature is constant, the infrared energy absorbed by the main body case 7 from the heater 8 corresponds to the sum of the reflected energy and the absorbed energy within the heating space S, except for slight transmission. Infrared radiation and absorption are the same quantity (Kirchhoff's law of radiation). Therefore, as shown in FIG. 8, the infrared reflectance of the enamel member due to the mixed glaze increases roughly in proportion to the weight ratio of the white glaze to the black glaze. It is presumed that it is adjusted by a enamel member made of glaze.

Furthermore, on the surface of the enamel member with the mixed glaze, the surface area of the white vitreous scattered and scattered in the black vitreous was analyzed. This analysis was performed using MATLAB (registered trademark) of MathWorks Inc. using the Otsu method (Otsu, N., "A Threshold Method from Gray-Level Histograms", IEEE Transactions on Systems, Man, and Cybernetics, Vol. 9, No. 1, 1979, pp62-66.) was used to perform binarization. Specifically, a threshold is chosen that minimizes the within-class variance of the thresholded black and white pixels. The composite histogram of the histogram of the black enamel and the histogram of the enamel member with mixed glaze was used as input to the discriminant analysis method, binarization was performed using the calculated threshold value, and the ratio of the white vitreous surface area was determined. Here, the ratio of the white vitreous surface area refers to the ratio of the white vitreous surface area to the surface area of the entire enamel member due to the mixed glaze. FIG. 9 is a graph showing the ratio of white vitreous surface area on the surface of the enamel member with the mixed glaze of FIG. As shown, in this embodiment, as the weight ratio of white glaze to black glaze increases from 2% to 10%, the ratio of the white vitreous surface area on the surface of the enamel member due to the mixed glaze is It has increased from 1% to less than 9%. Specifically, when the weight ratio of the white glaze is 2%, the white vitreous surface area ratio is 1.12%, and when the weight ratio of the white glaze is 10%, the white vitreous surface area ratio is 1.12%. The surface area ratio is increased to 8.17%.

(Example)
Example 1 is a grill chamber 6 in which the surface of the main body case 7 on the side of the heating space S shown in FIG. Raw saury was grilled using the grill chamber 6 of Example 1. In addition, under the same cooking conditions (heater temperature, cooking time, etc.), a grill chamber (Comparative Example 1) having a black enamel on the surface of the main body case 7 on the heating space S side and a surface of the main body case 7 on the heating space S side Raw saury was grilled and cooked using a grill chamber (Comparative Example 2) provided with an enamel made only of white glaze (white enamel), and the cooking effect was verified.

Table 1 shows the results of measuring the water reduction rate of the saury cooked using the grill chambers of Example 1, Comparative Example 1, and Comparative Example 2, respectively. Here, the water reduction rate refers to the ratio of the reduced weight of the food after cooking to the weight before cooking compared to before cooking. For example, if the weight of food before cooking is 150 g and the weight of food after cooking is 135 g, the water reduction rate is 10%.

As a result of verifying the cooking effect of the grilled saury, in the case of Comparative Example 2, the water reduction rate was the lowest, and the cooked saury was widely browned on the surface, but the internal heating was insufficient. A fishy odor remained. In the case of Comparative Example 1, the water reduction rate is higher than in Comparative Example 2, and the cooked saury is sufficiently heated inside and has no fishy smell, but the surface is lightly browned and has a watery texture. rice field. In the case of Example 1, the water reduction rate was the highest. The cooked saury had sufficient internal heating and no fishy odor. Furthermore, the surface was widely browned and the skin was crispy, and the texture of the baked dish was enjoyed. Thus, it was confirmed that the grill chamber 6 of the heating cooker 1 according to the embodiment of the present disclosure could provide a cooking effect peculiar to grilled cooking.

Next, bread was cooked using each of the grill chambers of Example 1, Comparative Example 1, and Comparative Example 2, and the cooking effect was verified. FIG. 10 shows a grill chamber (a) including an enamel member made of mixed glaze of Example 1 according to an embodiment of the present disclosure, a grill chamber (b) including a black enamel member of Comparative Example 1, and Comparative Example 2 It is an external appearance photograph of the bread cooked using each grill chamber (c) provided with white enamel.

As a result of verifying the cooking effect of the baked bread, in the case of Comparative Example 2, the baked bread was widely browned on the surface, but the temperature inside did not rise sufficiently, and the taste was not good. In the case of Comparative Example 1, the cooked bread had a good taste, but only the central portion of the surface was lightly browned. In the case of Example 1, the bread that was cooked had a brown color on the surface and a sufficiently high internal temperature, and had a good taste. In this way, the grill chamber 6 of the heating cooker 1 according to the embodiment of the present disclosure is provided with an enamel member made of a mixed glaze on the surface of the main body case 7 on the heating space S side, so that the cooked food can be cooked. It was confirmed that the baked color was improved.

The present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. Embodiments are also included in the technical scope of the present invention.

INDUSTRIAL APPLICABILITY The present invention is applicable to a heating cooker provided with a grill chamber that accommodates and heats foodstuffs.

1 heating cooker 2 housing 3 top plate 4 grill door 4a cooking container connection part 5 front panel 6 grill chamber 7 main body case 7a, 7b side wall 7c front opening 7d back plate 7e top plate 7f bottom plate 8 heater 9 grill plate 9a grill plate front ends 10a, 10b, 10c partitions 11a, 11b slide rails 12 grid-like structure 13a, 13b cooking vessel support member 14 inspection window 15 frame member

Claims (9)

A heating cooker having a grill chamber,
The grill chamber is
a body case in which a heating space for storing and heating ingredients is formed;
a heater for heating the food;
with
At least part of the surface of the main body case on the heating space side is composed of an enamel member formed by covering a metal member with a vitreous layer,
The enamel member has a color tone with a lightness L* of 27 or more and less than 31 in the L*a*b* color system.
heating cooker. A heating cooker having a grill chamber,
The grill chamber
a main body case in which a heating space for storing and heating ingredients is formed;
a heater for heating the food;
with
At least part of the surface of the main body case on the heating space side is composed of an enamel member formed by covering a metal member with a vitreous layer,
The enamel member has an infrared reflectance of 11.5% or more and less than 12.6% in the near-infrared wavelength region (center wavelength 1000 nm).
heating cooker. A heating cooker having a grill chamber,
The grill chamber
a main body case in which a heating space for storing and heating ingredients is formed;
a heater for heating the food;
with
At least part of the surface of the main body case on the heating space side is composed of an enamel member formed by covering a metal member with a vitreous layer,
The enamel member has a visible light reflectance of 5.3% or more and less than 6.5% in the visible light wavelength region (center wavelength 750 nm).
heating cooker. A heating cooker having a grill chamber,
The grill chamber is
a main body case in which a heating space for storing and heating ingredients is formed;
a heater for heating the food;
with
At least part of the surface of the main body case on the heating space side is composed of an enamel member formed by covering a metal member with a vitreous layer,
The vitreous layer includes a black vitreous and a white vitreous,
On the surface of the enamel member, the white vitreous surface area is 1% or more and less than 9% of the surface area of the enamel member.
heating cooker. The vitreous layer comprises a black vitreous and a white vitreous, wherein the white vitreous is interspersed in the black vitreous.
The heating cooker according to any one of claims 1 to 4. The enamel member is formed to cover at least a portion of a side surface of the body case on the heating space side,
The heating cooker according to any one of claims 1 to 5. The heater is arranged on the outer upper surface of the top plate of the main body case,
The heating cooker according to any one of claims 1 to 6. The grill storage further comprises a grill door closing the front opening and a slide rail,
The slide rail is arranged outside the heating space or on the bottom of the main body case,
The grill door is connected to one end of the slide rail, and configured to open and close the grill warehouse by sliding movement of the slide rail.
The heating cooker according to any one of claims 1 to 7. A side surface of the main body case on the heating space side has a portion not formed of the enamel member,
The heating cooker according to any one of claims 1 to 8.

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