JPH10174654A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating cooker which enables using of spatulas and knifes made of metal by employing an inorganic coat containing a fluororesin as under coat layer to improve the heat resistance and strength of the surface of a plate covered with the fluororesin. SOLUTION: An uneven face 2 and a fine coarse face 3 are formed on the surface of a plate base material 1. Furthermore, on the plate base material 1, a ceramic blast coated layer 4 is formed by blasting ceramics comprising 50-80wt.% of Al2 O3 and 50-20wt.% of TiO, an under coat layer 5 formed by using an in organic coating material comprising a phosphate containing a fluororesin, a middle coat layer 6 prepared by coating a primer for the fluororesin mainly composed of a polyamideimide and a top coat layer 7 formed by using a fluororesin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device such as a hot plate, and more particularly, to abrasion resistance (anti-scratch property),
The present invention relates to a heating cooker provided with a fluororesin coating film having excellent heat resistance and oil compatibility.

[0002]

2. Description of the Related Art Fluororesin-coated products have been widely used in heating cookers such as home hot plates and frying pans. This is because the fluororesin-coated product is easy to cook because the food is hard to scorch and hard to seize, and is easy to clean after cooking. However, there is a problem that the metal is easily damaged by contact with a spatula, a knife or the like, and the fluororesin coating is peeled off. This was partly due to the low abrasion resistance of the fluororesin coating itself and the shape of the plate surface.
That is, if there is substantially no unevenness on the fluororesin-coated surface, if the plate surface is rubbed with a metal spatula, knife, etc., the spatula, knife, etc. will come into contact with the entire plate surface, and This is because adhesion and peeling are promoted.

An example of such a fluororesin-coated cooker in which a spatula, a knife or the like is prevented from contacting the entire plate surface has been proposed in Japanese Patent Application Laid-Open No. H5-245047.
In this cooker, an uneven shape is provided on the base material surface. Since the recess is deep and large enough to have a part of the fluororesin-coated surface, even if it is strongly rubbed with a metal spatula, knife, etc., it is blocked by the high protruding portion and prevents the abrasion of the fluororesin coating layer of the recess. can do.

[0004]

However, when compared with a cooking device having substantially no irregularities on the fluororesin-coated surface, such a cooking device is significantly improved in terms of scratching and peeling of the plate surface, It did not prevent damage or peeling at the protrusion.

[0005] Further, cookers without such irregularities include those with improved ground treatment by increasing the sandblast roughness or ceramic spraying and those with whiskers or the like added to a fluororesin. However, there was still a problem from the viewpoint of preventing the fluororesin-coated surface from being scratched and peeling off.

[0006] Further, with respect to heat resistance, the conventional specification has a problem that the hardness at the time of heating is lowered due to the softening of the undercoat paint.

[0007] The present invention solves the above-mentioned conventional problems and improves the heat resistance and strength of the fluororesin-coated plate surface by using an inorganic paint containing a fluororesin as an undercoat layer. An object of the present invention is to provide a cooking device in which a knife can be used.

[0008]

In order to achieve the above object, a heating cooker according to the present invention is a heating cooker having an undercoat layer and an overcoat layer on a substrate, wherein the undercoat layer is made of fluorine. It is formed of an inorganic paint made of a phosphate containing a resin, and the overcoat layer is formed of a fluororesin.

In the heating cooker, it is preferable to use polytetrafluoroethylene or a mixture of polytetrafluoroethylene and a tetrafluoroethylene-perfluoroalkylvinyl ether copolymer as the fluororesin of the overcoat layer.

According to the heating cooker as described above, since the undercoat layer contains the fluororesin, the adhesion to the overcoat layer which is the fluororesin layer can be improved. Further, since the undercoat layer itself, which is an inorganic paint, has high hardness and excellent heat resistance, the strength of the overcoat layer, which is a fluororesin layer, and the heat resistance of the plate surface can be increased. Such adhesion, high hardness, and heat resistance can prevent the overcoat layer from being scratched or peeled off. In addition, by overlaying and processing a fluororesin layer on the undercoat layer of an inorganic paint having no airtightness, the fluororesin layer becomes porous, and oil such as grilled meat becomes familiar with the fluororesin layer and can be deliciously cooked. .

[0011] In the heating cooker, the surface of the base material is subjected to a sandblast treatment, and the surface of the base material is coated with Al.
₂ O ₃ is 50 to 80 wt%, it is preferable to having a ceramic thermal spraying layer formed by thermal spraying a ceramic TiO consists range of 50 to 20 wt%. Since the ceramic sprayed layer as described above has a high ratio of TiO, high strength can be secured. Therefore, the strength of the plate surface can be increased.

In the heating cooker, it is preferable that an irregular shape is formed on the surface of the base material, and an average height of the irregularities between the concave portion and the convex portion is 50 to 100 μm. The preferable uneven shape is preferably a grain shape.

[0013] According to the above structure, the unevenness is provided on the surface of the base material, and the concave portion is deep and large enough to have a part of the fluororesin-coated surface. Even if it is strongly rubbed with, for example, it is possible to prevent abrasion of the fluororesin coating layer which is interrupted by the high protruding portion and exists in the concave portion.

It is preferable that the heating cooker further includes an intermediate coating layer formed by applying a primer for a fluororesin containing polyamideimide as a main component on the undercoat layer.

As described above, by providing the intermediate coating layer as the primer layer, it is possible to adjust the amount of oil of the cooked material such as grilled meat to the undercoat oil layer.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a cross-sectional view illustrating a surface state of the heating cooker according to the present embodiment. Reference numeral 1 denotes a plate substrate made of aluminum or an aluminum alloy. 2
Indicates an uneven surface. The average height of the concave and convex portions is preferably 50 to 100 μm. This is because if such a height is secured, even when the fluororesin-coated surface is formed, the concave portion will not be completely buried, and the concave and convex shape still exists. If there is an uneven shape, even if it is strongly rubbed with a metal spatula, a knife or the like, it is possible to prevent abrasion of the fluororesin coating layer which is interrupted by the protruding portion which is the protruding portion and is present in the concave portion.

The uneven surface 2 is preferably embossed. Here, the grain shape refers to a shape similar to the surface shape of the grain fabric obtained by relaxing a fabric using a strong twist yarn, such as a fiber woven fabric such as Yang willow or crepe. That is, it has a fine groove-shaped concave portion, and the concave-convex shape exhibits a certain change pattern.

A fine rough surface 3 is formed on the uneven surface 2 by sandblasting. The average height of the irregularities on the rough surface is about 15 μm or less (usually about 10 μm).
Here, the sand blasting refers to a process in which high-hardness ceramic fine particles such as alumina are collided with an air flow of, for example, 4 to 7 kg / cm ² . The reason for forming the fine rough surface 3 by the sandblasting process as described above is as follows.
This is for improving the adhesiveness between the plate substrate 1 and another coating layer by the anchor effect.

Further, a ceramic spray layer 4 is formed on the uneven surface 2. The ceramic spray layer 4 is formed by a method such as plasma spraying or gas spraying. The components of the ceramic powder forming the ceramic spray layer 4 are 50 to 80% by weight of Al ₂ O _{3 and} 50 to 80% by weight of TiO.
A range of 20% by weight is preferred. Within this range, Ti
If the ratio of O is increased, the strength can be further improved. The preferred thickness of the ceramic sprayed layer 4 is an average thickness of 3
It is about 0 μm.

Reference numeral 5 denotes an undercoat layer, the material containing a fluororesin
This is an inorganic coating made of a phosphate salt. To phosphate
Are primary orthophosphate, secondary orthophosphate, tertiary orthophosphate
Salt, acid pyrophosphate, neutral pyrophosphate, trimetali
Phosphate, polymetaphosphate, polyphosphate, ortholine
Acid salts are preferred. For example, orthophosphate
Aluminum phosphinate, which contains Al (H_TwoPO_Four)
_Three, AlH_Three(PO_Four)_Two, Al _Two(HPO_Four)_Three, AlPO_FourBut
is there. In addition, as a curing agent for phosphate, metal oxide
MgO, CaO, ZnO, Al_TwoO_Three, Fe_TwoO_Three, Ti
O_Two, SrO.nTiO_TwoSuch as metal hydroxide Mg (O
H)_Two, Ca (OH)_Two, Zn (OH)_Two, Al (OH)_ThreeSuch,
Silicate MgSiO_Three, CaSiO_ThreeBorate B_Two
O_ThreeAnd Group II borates. Undercoat layer 5 preferred
The new thickness is in the range of 20 to 40 μm in average thickness.

The inorganic coating has the advantage that a coating film having excellent heat resistance and high hardness can be formed. Therefore, since the undercoat layer 5 itself, which is an inorganic paint, has high hardness, the strength of the overcoat layer, which is a fluororesin layer, can be increased. Furthermore, since the undercoat layer 5 has excellent heat resistance, the heat resistance of the plate surface can be increased. Further, since the undercoat layer 5 contains fluorine, the adhesion to the overcoat layer 6 which will be described later, which is a fluororesin layer, can be improved. For this reason, it is possible to prevent the overcoat layer 6 from being scratched or peeled off. Further, by processing the fluororesin layer 7 on the undercoat layer 5 having no airtightness, the fluororesin layer is processed. 7 becomes porous, and the oil such as grilled meat adjusts to the fluororesin layer and can be deliciously cooked.

Reference numeral 6 denotes an intermediate coating layer, which comprises a primer for a fluororesin. The intermediate coating layer 6 is for adjusting the amount of oil of the cooked material such as grilled meat to the undercoat layer 5 of the oil.
The preferred thickness of the intermediate coating layer 6 is in the range of an average thickness of 1 to 10 μm, more preferably in the range of 3 to 7 μm, and particularly preferably 5 μm.

Reference numeral 7 denotes an overcoat layer made of a fluororesin. As the fluororesin used for the overcoat layer 7, polytetrafluoroethylene (PTFE) or a mixture of polytetrafluoroethylene and a tetrafluoroethylene-perfluoroalkylvinyl ether copolymer is used. The preferred thickness of the overcoat layer 7 is in the range of an average thickness of 10 to 30 μm.

[0024]

An embodiment of the present invention will be described below with reference to FIG. On a plate substrate 1 made of aluminum,
The textured surface 2 was formed by graining. The average height of the unevenness was about 100 μm. Next, sand blasting was performed on the uneven surface 2 to form a fine rough surface 3.

Next, the uneven surface 2 is formed by plasma spraying.
The ceramic was sprayed thereon to form a ceramic sprayed layer 4. The average value of the thickness of the ceramic sprayed layer 4 was about 30 μm. The component of the ceramic powder is Al ₂ O ₃ 60% by weight,
TiO was 40% by weight.

Next, a phosphate-based inorganic coating material (Sumiceram FL manufactured by Asahi Chemical Industry Co., Ltd.) is formed on the ceramic sprayed layer 4.
-440B) to form an undercoat layer 5. This undercoat layer 5 was dried at 100 ° C. This undercoat layer 5
The average value of the thickness was about 30 μm. Next, a fluororesin paint (EK-4 manufactured by Daikin Industries, Ltd.) is applied to the undercoat layer 5.
609BK) and baked at 380 ° C for 20 minutes.
An overcoat layer 7 which was a fluororesin coating film was formed. The average value of the thickness of the overcoat layer 7 was about 20 μm.

As a comparative example, a conventional heating cooker processed with a fluororesin was prepared. In this comparative example, the components of the ceramic for the ceramic sprayed layer 4 were 97% by weight of Al ₂ O ₃ and 3% by weight of TiO. Fluororesin-based primer (EK-190 manufactured by Daikin Industries, Ltd.) as undercoat layer 5
9BKN) was used. In this comparative example, the ceramic sprayed layer 4
The components other than the undercoat layer 5 are the same as those in the above embodiment.

The embodiment described above and the comparative example were compared and evaluated. Comparative evaluation was performed on the hardness and adhesion of the layer portion. The comparison results are shown in Table 1 below. The measuring method is JI
According to SK6894.

[0029]

[Table 1]

In the test result column of the pencil hardness test in Table 1, the hardness symbol of the pencil is shown. In addition, the test result column of the drawing test shows the evaluation score, which is a maximum of 5 points. The evaluation score is also shown in the test result column of the cross cut tape test, and the maximum score is 10 points.

From the results of the pencil hardness test, it can be seen that the hardness of this embodiment is much higher than that of the comparative example.
Regarding the adhesive force, the highest score was obtained in both the examples and comparative examples, and good results were obtained.

The reason why the measurement was impossible in the test result column of the example is that the measuring needle did not reach the base material.
This is probably because the hardness of the layer portion of the example was higher than that of the comparative example.

[0033]

As described above, according to the heating cooker of the present invention, since the undercoat layer contains the fluororesin, the adhesion to the overcoat layer which is the fluororesin layer can be improved. Further, the undercoat layer itself, which is an inorganic paint, has high hardness and excellent heat resistance, so that the strength of the overcoat layer and the heat resistance of the plate surface can be increased. Such adhesion, high hardness, and heat resistance can prevent the overcoat layer from being scratched or peeled off.

Further, by processing the fluororesin layer on the undercoat layer of the inorganic paint having no airtightness, the fluororesin layer becomes porous, and the oil such as grilled meat becomes familiar with the fluororesin layer and cooks deliciously. be able to.

In the cooking device, the surface of the base material is subjected to sandblasting, and the surface of the base material is coated with Al.
₂ O ₃ is 50 to 80 wt%, by providing the ceramic ceramic thermal spraying layer TiO consists 50 to 20 wt%, it is possible to increase the strength of the plate surface.

By forming an uneven surface of 50 to 100 μm on the surface of the substrate, even if it is strongly rubbed with a metal spatula, a knife or the like, it is cut off by a high protruding portion and the fluororesin coating layer existing in the concave portion is removed. Wear can be prevented.

By providing an intermediate coating layer as a primer layer on the undercoat layer, it is possible to adjust the amount of cooking oil such as grilled meat to the oil undercoat layer.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a surface state of an embodiment of a heating cooker according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plate base material 2 Rough surface 3 Fine rough surface 4 Ceramic sprayed layer 5 Undercoat layer 6 Intermediate layer 7 Overcoat layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B32B 15/08 B32B 15/08 E 102 102B C23C 4/10 C23C 4/10

Claims (6)

[Claims] 1. A heating cooker provided with an undercoat layer and an overcoat layer on a substrate, wherein the undercoat layer is formed of an inorganic paint made of a phosphate containing a fluororesin, and the overcoat layer is A cooking device characterized by being formed of a fluororesin. 2. The heating cooker according to claim 1, wherein polytetrafluoroethylene or a mixture of polytetrafluoroethylene and a tetrafluoroethylene-perfluoroalkylvinyl ether copolymer is used as the fluororesin of the overcoat layer. 3. The surface of the base material is subjected to a sand blast treatment, and 50 to 80% by weight of Al ₂ O ₃
The heating cooker according to claim 1, further comprising a ceramic sprayed layer formed by spraying a ceramic in which O is in a range of 50 to 20% by weight. 4. The cooking device according to claim 1, wherein an uneven shape is formed on the surface of the base material, and the average height of the unevenness between the concave portion and the convex portion is 50 to 100 μm. 5. The cooking device according to claim 4, wherein the uneven shape is a grain shape. 6. The heating cooker according to claim 1, further comprising an intermediate coating layer formed on the undercoat layer with a primer for a fluororesin containing polyamideimide as a main component.