JP2001046223A - Cooking container and water boiling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and efficiently remove chlorine from drinking water or the like by forming a layer having a pyroelectric substance on the internal surface of the main body of a cooking container, or forming a layer containing the pyroelectric substance and a metal ion, or forming a layer containing the metal ion on the top of the layer containing the pyroelectric substance. SOLUTION: On the internal surface of the main body of a cooking container, in which drinking water, a liquid for drinking or cooking materials are housed, a layer having a pyroelectric substance, of a layer connecting the pyroelectric substance and a metal ion, is formed, or a layer containing the metal ion is formed on the top of the layer containing the pyroelectric substance. The pyroelectric substance is a substance indicating pyrelectricity, and tourmaline or a hemimorphite or the like can be counted. The content of the pyroelectric substance is preferably 0.1 to 15 wt.% of the total weight of the materials forming the layer in either case. When the content is too small, the removal accelerating effect for chlorine becomes lower, and when the content is too large, the bonding strength of the layer decreases, and a peeling or the like becomes easy to occur.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cooking vessel and a water heater. More particularly, the invention relates to drinking water,
The inner surface of the container body containing the beverage liquid or cooking material,
Alternatively, a layer containing a pyroelectric substance, a layer containing a pyroelectric substance and a metal ion, or a layer containing a pyroelectric substance, The present invention relates to a cooking vessel and a water heater having a layer containing a substance and further having a layer containing metal ions on the layer. When the cooking container and the water heater of the present invention are used, drinking water, liquid for drinking, cooking material, removal of chlorine contained in hot water, etc. is promoted, and chlorine odor is eliminated, and drinking water, liquid for drinking, cooking material, PH of hot water rises,
The taste, texture and flavor are improved. Further, when an emulsified food such as mayonnaise is produced using the cooking container of the present invention, emulsification is promoted and the taste becomes excellent.

[0002]

2. Description of the Related Art Chlorine contained in drinking water, especially tap water, is a major cause of a chlorine odor and a decrease in taste of water. In the removal of chlorine and other harmful substances contained in drinking water, a boiling method, a method using a water purifier filled with a purifying material, and the like have been widely used. However, in the case of boiling, it is not possible to remove chlorine sufficiently without boiling for a certain period of time, it takes time and labor, and it is uneconomical in terms of thermal efficiency. Often not done. In the case of using a water purifier, chlorine and other harmful substances are removed smoothly in the early stage of use of the water purifier. Since the cleaning ability is deteriorated due to accumulation, it is necessary to frequently replace the cleaning material, which is troublesome and costly. Also,
In recent years, there has been an increasing interest in foods, and accordingly, there has been a strong demand for cooking containers capable of producing dishes (cooked products) having excellent taste, texture and flavor, but products that are still fully satisfactory. Is currently not available. Further, in recent years, water heaters have become widespread, and are widely used in many fields such as homes, restaurants, hospitals, sports facilities, factories, and the like. In many cases, chlorine added to water is contained as it is, which is one of the main causes of chlorine odor and a decrease in taste.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate chlorine from drinking water such as tap water and drinking liquid without using a long-time boiling treatment or using a water purifier. Of the present invention is to provide a cooking container that can easily and efficiently remove water, has no chlorine odor, and can obtain drinking water or liquid for drinking that is excellent in taste and flavor. The present invention provides a cooking container capable of producing a cooked product having excellent taste, texture, and flavor when used for cooking ingredients such as eggs, vegetables, and meat as well as drinking water and liquid for drinking. It is to provide. It is a further object of the present invention to provide a water heater that can discharge tasty hot water that does not contain chlorine or has a reduced chlorine content and has no chlorine odor.

[0004]

As a result of various studies conducted by the present inventor to achieve the above-mentioned object, the present invention has been made on cooking vessels, especially cooking vessels involving heating and heating of drinking water, drinking liquid or cooking materials. In, a layer containing a pyroelectric substance is provided on the inner surface of the container body, and drinking or drinking water or a cooking material is put into a cooking container having the layer and heated or heated,
It has been found that the removal of chlorine contained in drinking water, drinking liquid or cooking ingredients is promoted, and the pH is increased, chlorine odor is eliminated, and water and drinking liquid with good taste, taste and flavor are obtained. . Further, the present inventor, when providing a layer containing a pyroelectric substance on the inner surface of the main body of the cooking container, further provided a layer containing metal ions on the layer containing the pyroelectric substance, or When the metal ion is further contained in the layer containing the acidic substance, removal of chlorine from drinking water and drinking liquid and increase in pH are further promoted,
It has been found that chlorine odor is further reduced, and water and beverage liquids having good taste and flavor can be obtained.

Further, the inventor of the present invention has found that the above-mentioned effects are not limited to cooking vessels, but are also produced in a water heater.
Whether a layer containing a pyroelectric substance is provided on the inner surface of the hot water storage unit of the water heater, or on the inner surface of the hot water storage unit and the inner surface of the pipe,
If a layer containing a pyroelectric substance and metal ions is provided, or a layer containing a pyroelectric substance is provided, and a layer containing metal ions is provided on the layer, the chlorine contained in water can be reduced. It has been found that the removal is promoted and the pH rises, so that hot water having no chlorine odor and good taste and flavor can be obtained.

[0006] In the course of the above experiment, the present inventor used the cooking vessel having the above-mentioned specific layer to prepare eggs,
When various foods such as vegetables and meat were cooked, it was found that a cooked product excellent in taste, texture and flavor was obtained. For example, when a boiled egg was made using a cooking vessel having the above-mentioned specific layer, a difference in taste between white and yolk was clearly felt compared to a boiled egg made using a normal cooking vessel. Especially, the clarity and taste of white meat were outstanding. Moreover, when vegetables, such as broccoli, were boiled using the cooking vessel having the above-mentioned specific layer, the original sweetness of the vegetables was enhanced, and the vegetables could be eaten deliciously without any seasonings. In addition, when ginger-baked pork was prepared using the cooking container having the above-mentioned specific layer, the meat was not hardened, the meat and the seasoning blended well with each other, and a delicious grilled meat was obtained. The meat did not become firm. Furthermore, the present inventors made an emulsified food such as mayonnaise using a cooking vessel such as a bowl having the above-mentioned specific layer, and compared with the case where a bowl without the above-mentioned layer was used, Was promoted, and a fine emulsified food with a fine texture was obtained.

Then, the present inventors formed the above-mentioned layer provided on the inner surface of the main body of the cooking vessel, the inner surface of the hot water storage portion of the water heater, or the inner surface of the hot water storage portion and the inner surface of the pipe, from a fluororesin, When containing a pyroelectric substance, a pyroelectric substance and metal ions, or a metal ion, those layers become heat-resistant, chemically stable (chemical resistance),
Extremely non-adhesive, water-repellent, oil-repellent, etc., it prevents water stains and cooking materials from adhering to the inner surface of the main body of the cooking container, the inner surface of the hot water storage unit of the water heater or the inner surface of the piping, and also removes the chlorine described above. It has been found that water (hot water), a liquid for drinking, and a cooked product can be obtained in which the accelerating action and the pH increasing action are more excellently exhibited, and the taste, texture and flavor are more excellent, and based on their various findings. The present invention has been completed.

That is, the present invention provides: (1) a cooking container having a layer containing a pyroelectric substance, a layer containing a pyroelectric substance and metal ions, A cooking container having a layer containing a substance and further having a layer containing metal ions on the layer.

The present invention further provides: (2) a cooking container according to the above (1), which is a cooking container with heating or heating; and (3) a cooking container containing drinking water, a liquid for drinking or a cooking material. (4) The cooking container of the above (1) or (2); and (4) the cooking containers of the above (1) to (4) which are pots, kettles, pots, pots, frying pans, bowls, water bottles, or boiled egg maker. (3) any one of the cooking containers;

Further, the present invention provides: (5) a method wherein the metal ion is silver, zinc, copper, gold, platinum, iron,
The cooking vessel according to any one of (1) to (4), which is an ion of at least one metal selected from nickel and cobalt; (6) the above (1) to (4), wherein the metal ion is supported on inorganic particles. And (7) a fluororesin layer containing a pyroelectric substance or a fluororesin layer containing a pyroelectric substance and a metal ion on the inner surface of the main body of the cooking vessel. Or the cooking container according to any one of (1) to (6) above, further comprising a fluororesin layer containing a pyroelectric substance, and further having a fluororesin layer containing metal ions on the layer.

Further, the present invention provides (8) a method in which a layer containing a pyroelectric substance is provided on the inner surface of a hot water storage unit, or on the inner surface of a hot water storage unit and the inner surface of a pipe, or a mixture of a pyroelectric substance and metal ions is provided. A water heater comprising: a layer containing a pyroelectric substance; a layer containing a pyroelectric substance; and a layer containing a metal ion on the layer.

Further, the present invention provides: (9) a method wherein the metal ion is silver, zinc, copper, gold, platinum, iron,
(10) the water heater of (8), which is an ion of at least one metal selected from nickel and cobalt; (10) the water heater of (8) or (9), wherein the metal ions are supported on inorganic particles; (11) A fluororesin layer containing a pyroelectric substance or a fluororesin layer containing a pyroelectric substance and metal ions is provided on the inner surface of the hot water storage unit of the water heater, or on the inner surface of the hot water storage unit and the inner surface of the pipe. The water heater according to any one of the above (8) to (10), which has a fluororesin layer containing a pyroelectric substance, and further has a fluororesin layer containing metal ions on the layer. .

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The cooking container of the present invention has (a) a layer containing a pyroelectric substance on the inner surface of a container main body containing drinking water, a liquid for drinking or a cooking material; and (b) a pyroelectric substance and metal ions. Or (c) having a layer containing a pyroelectric substance and further having a layer containing a metal ion on the layer.

Further, the water heater of the present invention is characterized in that (a) a layer containing a pyroelectric substance is provided on the inner surface of the hot water storage portion or on the inner surface of the hot water storage portion and the inner surface of the pipe; (C) having a layer containing a pyroelectric substance and further having a layer containing a metal ion on the layer;

In the cooking vessel or the water heater according to the present invention, among the above-mentioned aspects (a) to (c), the one described in the above (c), that is, the inner surface of the main body of the cooking vessel or the hot water storage section of the water heater is provided. A layer having a pyroelectric substance-containing layer on the inner surface or on the inner surface of the hot water storage section and on the inner surface of the pipe, and further having a layer containing metal ions as an outermost layer on the layer, removes chlorine contained in water. The effect is extremely high,
In addition, the degree of the increase in pH is greater, and the effect of improving the taste, texture, and flavor of water (hot water), beverage liquids, and cooked products is particularly large, which is particularly preferable. Subsequent to the mode (c), the pyroelectric substance and the metal ions are applied to the mode (b), that is, the inner surface of the main body of the cooking vessel or the inner surface of the hot water storage unit or the inner surface of the hot water storage unit and the inner surface of the pipe of the water heater. It is preferable to use a layer having a containing layer as the outermost surface layer.

Here, the "cooking container" in the present invention refers to a drinking water or a liquid for drinking (for example, green tea,
Oolong tea, barley tea, roasted tea, coffee, tea, soup, etc.), various cooking materials (for example, vegetables, cereals, beans, potatoes, meat, seafood, eggs, processed products using them, etc.) A container that performs heating, heating, cooling, storage, boiling, stir-friing, baking, frying, mixing, stirring, frothing, and the like. The cooking container of the present invention involves heating or heating,
Any of those without heating or heating, those with cooling, those with heating, heating and cooling and the like may be used. Specific examples of the cooking container of the present invention include various pans (for example, various types of Japanese pans, peanuts, two-sided pans, one-sided pans, pasta pans, flat pans, pots, etc.), Pots (electrically heated pots, pots storing hot water heated externally by gas, coffee pots, etc.), various pots (electric rice cookers, gas rice cookers, other pots), frying pans, Examples include bowls, boiled eggs, water bottles, and the like. The material of the cooking vessel body is not particularly limited, and metals (eg, iron, copper, aluminum, silver, stainless steel and other alloys), ceramics,
It may be made from any of earth, glass, ceramic, plastic, enameled, a composite of two or more of the aforementioned materials. Among them, a cooking container having a container body made of stainless steel, particularly a cooking container having a stainless steel container body containing about 18 to 20% by weight of chromium and about 8 to 10% by weight of nickel has excellent heat resistance. When the above-mentioned specific layer containing pyroelectric substance is formed inside the container body, it is effective in improving chlorine removal effect, pH increasing effect, taste, texture, flavor, etc. It is preferably used because it exerts better. The thickness and size of the container main body in the cooking container can be appropriately determined according to the material of the cooking container, the type and use of the cooking container, and the like.

The type, shape, and structure of the water heater of the present invention are not particularly limited.
Any of kerosene heating type water heaters and the like may be used. Further, the size of the water heater is not particularly limited, and may be any of a small water heater, a medium-sized or large-sized water heater (such as a boiler) for business use or industrial use.

The "pyroelectric substance" used in the present invention is a substance exhibiting pyroelectricity (pyroelectricity or pyroelectricity), and any pyroelectric substance can be used. And pyroelectric minerals such as oreokite. Among them, tourmaline which is a kind of tourmaline is preferably used. These pyroelectric substances are particularly preferably used in the form of fine particles or fine powder.The pyroelectric substance in the form of fine particles or fine powder exhibits a pyroelectric function sufficiently due to its large surface area, and thus the present invention The effect can be further enhanced, and it can be uniformly mixed and dispersed in the inner surface of the main body of the cooking container or the inner surface of the hot water storage unit or the inner surface of the hot water storage unit and the pipe inner surface of the water heater, and from the layer containing the same. There is no dropout. From this point, the average particle size of the pyroelectric substance is preferably 3 μm or less, and 2 μm or less.
m, more preferably 1 μm or less.

The content of the pyroelectric substance in the pyroelectric substance-containing layer provided on the inner surface of the main body of the cooking vessel or the inner surface of the hot water storage portion or the inner surface of the hot water storage portion and the inner surface of the pipe of the water heater is the above (a) to (a). In each case (c), it is preferably 0.1 to 15% by weight, more preferably 0.5 to 10% by weight, based on the total weight of the material forming the layer. , 1 to 7% by weight. If the content of the pyroelectric substance in the layer is too small, drinking water,
The effect of promoting the removal of chlorine from drinking liquids and the like tends to be low, the effect of increasing the pH is not sufficiently exhibited, and the effects of improving the taste, texture, and flavor of drinking water, drinking liquid, and cooked products are insufficient. Easy to be. In addition, when the cooking container is used for producing an emulsified food, the emulsification accelerating action is not sufficiently exhibited. On the other hand, when the content of the pyroelectric substance in the layer is too large, the adhesive strength of the layer to the inner surface of the main body of the cooking vessel or the inner surface of the hot water storage unit or the inner surface of the hot water storage unit and the inner surface of the pipe of the water heater is reduced, and the layer is separated. , The smoothness (gloss) of the coating film is lost, and the effect of the present invention is not further improved, and the cost is likely to increase due to the use of a large amount of expensive pyroelectric substance.

The above-mentioned embodiment (b) having a layer containing a pyroelectric substance and metal ions on the inner surface of the main body of the cooking vessel or the inner surface of the hot water storage portion or the inner surface of the hot water storage portion and the inner surface of the pipe of the water heater, and (C) having a layer containing an electroconductive substance and further having a layer containing a metal ion on the layer.
Specific examples of the metal ion used in the embodiment of
Silver, zinc, copper, gold, platinum, iron, nickel, cobalt,
Examples thereof include metal ions selected from lead, chromium, and tin, and these metal ions may be used alone or in combination of two or more. Among them, ions of at least one metal selected from silver, zinc, copper, gold, platinum, iron, nickel and cobalt are preferred from the viewpoint of safety and hygiene.

The metal ions may be contained in a layer provided on the inner surface of the main body of the cooking vessel or on the inner surface of the hot water storage portion or on the inner surface of the hot water storage portion and the inner surface of the pipe as it is, without being carried on a carrier or the like. In order to exert the effect of the present invention over a long period of time, it is preferable that the carrier be retained in a carrier and contained in the layer. In such a case, inorganic fine particles are preferably used as the carrier, and in particular, inorganic fine particles having an ion exchange ability and a metal ion adsorbing ability and having a high ability to retain metal ions are preferably used. Representative examples of inorganic fine particles preferably used as a carrier for metal ions include inorganic fine particles having an ion exchange ability such as zeolite, zirconium phosphate, calcium phosphate, etc. Among them, zeolite is more preferable. If zeolite is used as the inorganic fine particles, the zeolite holding the metal ions is sufficiently heated and dried to reduce the moisture content, and the zeolite holding the metal ions is heated to the inner surface of the main body of the cooking vessel or the inner surface of the hot water storage unit or the inner surface of the hot water storage unit of the water heater. It can be uniformly and firmly present in the layer provided on the inner surface of the pipe.

The inorganic fine particles for retaining metal ions preferably have an average particle size of 3 μm or less.
It is more preferably 2 μm or less, further preferably 1 μm or less. The average particle size of the inorganic fine particles is 3 μm
When it is larger than this, the smoothness of the layer provided on the inner surface of the main body of the cooking vessel or the inner surface of the hot water storage portion or the inner surface of the hot water storage portion and the inner surface of the pipe of the water heater becomes easy to be lost, and furthermore, peeling of the layer from the inner surface, Of the inorganic fine particles carrying the metal ions easily fall off.

When the metal ions are supported on the inorganic fine particles, the metal ions are preferably supported on the inorganic fine particles at a high concentration. For example, when the inorganic fine particles are zeolite having an ion exchange capacity, the ion exchange capacity of the zeolite is 90%. % Or more is preferably ion-exchanged with metal ions,
When the metal ions are held by the physical adsorption ability of the inorganic fine particles, the metal ions are preferably adsorbed so as to be 90% or more of the saturation.

The inorganic fine particles carrying metal ions are usually obtained by impregnating the inorganic fine particles with an aqueous solution containing the above-mentioned silver, zinc and other metal ions, and then drying. Of course, the present invention is not limited to this method, and any method can be employed as long as it can prepare inorganic fine particles carrying metal ions at a high concentration.

In the above embodiments (b) and (c) in which metal ions are used together with the pyroelectric substance, the layers provided on the inner surface of the main body of the cooking vessel or the inner surface of the hot water storage portion of the water heater or the inner surface of the hot water storage portion and the inner surface of the pipe. The content of the metal ion in any of the above (b) and (c), the action of promoting the removal of chlorine from drinking water, liquid for drinking, and cooking materials,
From the viewpoints of pH increasing effect, taste, texture and flavor improving effect, emulsification promoting effect, adhesion strength to the inner surface of the main body and the layer containing a pyroelectric substance, smoothness of the layer containing metal ions, etc. As the weight of the inorganic fine particles in the form of ions, based on the total weight of the material forming the layer,
0.05 to 10% by weight, preferably 0.1 to 10% by weight.
More preferably, it is 5% by weight.

The layer containing the pyroelectric substance, the layer containing the pyroelectric substance and the metal ion or the layer containing the metal ion may be used together with the pyroelectric substance and / or the metal ion, if necessary. Additives, for example, one or more of pigments such as coloring pigments and extender pigments, antibacterial agents, antisettling agents, surfactants, film-forming accelerators, antioxidants, flame retardants, antistatic agents, matting agents, etc. May be contained.

A layer containing a pyroelectric substance in the cooking vessel and the water heater of the above (a) and (c); a layer containing a pyroelectric substance and metal ions in the cooking vessel and the water heater of the above (b); Further, the thickness of the layer containing metal ions in the cooking container and the water heater of the above (c) depends on the type of the material forming the main body of the cooking container, the hot water storage portion and the pipe portion of the water heater, and the inner surface thereof. It can be adjusted according to the type of the coating material forming the layer to be provided, the type of the cooking vessel and the type of the water heater, and the like.

Generally, in the cooking container or the water heater of the above (a) and (b), mechanical characteristics such as mechanical strength of the layer, ease of forming the layer, the inner surface of the layer and the cooking container body or the water heater In view of the adhesive strength between the inner surface of the hot water storage unit or the inner surface of the hot water storage unit and the inner surface of the pipe, etc., a layer containing a pyroelectric substance provided on the inner surface of the container body or the inner surface of the hot water storage unit or the inner surface of the hot water storage unit and the inner surface of the pipe The thickness of the layer containing the pyroelectric substance and the metal ion is preferably from 0.1 to 100 μm, more preferably from 0.3 to 50 μm, even more preferably from 0.5 to 20 μm. .

Further, in the cooking container or the water heater of the above (c), the mechanical properties such as the mechanical strength of the layer, the ease of forming the layer, the inner surface of the layer and the inside of the main body of the cooking container or the inner surface of the water heater of the water heater. Or, in view of the adhesive strength between the inner surface of the hot water storage portion and the inner surface of the pipe, the adhesive strength between the layer containing the pyroelectric substance and the layer containing the metal ions, or the like, the inner surface of the container body, the inner surface of the hot water storage portion, or the inner surface of the hot water storage portion The thickness of the layer containing the pyroelectric substance provided on the inner surface of the pipe is 0.1 to 100 μm, and the thickness of the layer containing the metal ions provided thereon is 0.1 to 1 μm.
The thickness of the layer containing the pyroelectric substance is preferably 0.3 to 50 μm, and the thickness of the layer containing the metal ions is more preferably 0.3 to 50 μm. The thickness of the layer containing the active substance is 0.5 to 20 μm
And the thickness of the layer containing metal ions is 0.5 to 20 μm
Is more preferable.

The layer containing the pyroelectric substance or the layer containing the pyroelectric substance and the metal ion is formed by the adhesive strength between the inner surface of the main body of the cooking vessel or the inner surface of the hot water storage unit or the inner surface of the hot water storage unit of the water heater and the inner surface of the pipe. When the water content is high, it may be provided directly on the inner surface of the container body, the inner surface of the hot water storage portion, or the inner surface of the hot water storage portion and the inner surface of the pipe. When the adhesive strength is low or the adhesive strength is desired to be higher, the inner surface of the container body or the inner surface of the hot water storage unit or the inner surface of the hot water storage unit and the inner surface of the pipe of the water heater, and the layer containing the pyroelectric substance or the pyroelectric material An adhesive layer, a primer layer, and the like may be interposed between the substance and the layer containing metal ions. The type of adhesive layer or primer layer depends on the inner surface of the main body of the cooking vessel, the inner surface of the hot water storage unit of the water heater, the inner surface of the pipe, the layer containing the pyroelectric substance, or the layer containing the pyroelectric substance and metal ions. It is better to select according to the material and the like. For example, the inner surface of the body of the cooking container,
If the inner surface of the hot water storage unit or the inner surface of the pipe of the water heater is made of metal such as stainless steel, and the layer containing the pyroelectric substance or the layer containing the pyroelectric substance and metal ions is a fluororesin, the fluororesin is converted to metal. Fluororesin-based primers, epoxy resin-based primers and the like used for coating are preferably used, and specific examples include “Pyrosine Riflon DX Primer 70” manufactured by Oshima Kogyo Co.
13 black ". The thickness of the primer layer or the adhesive layer is determined by the material of the inner surface of the hot water storage portion or the inner surface of the pipe of the cooking vessel body or the water heater, the material of the layer containing the pyroelectric substance or the layer containing the pyroelectric substance and the metal ion, Although it can be adjusted according to the type of the primer or the adhesive, it is generally preferably 1 to 100 μm, more preferably 5 to 50 μm, and 10 to 3 μm.
More preferably, it is 0 μm.

In the cooking container and the water heater of the above (c), when the adhesion between the layer containing the pyroelectric substance and the layer containing the metal ions laminated thereon is good, On the inner surface of the main body of the cooking container or the inner surface of the hot water storage unit of the water heater or the inner surface of the hot water storage unit and the inner surface of the pipe, the metal ion without the interposition of an adhesive layer or a primer layer Can be directly provided as it is. When the pyroelectric substance-containing layer and the metal ion-containing layer are made of the same or similar material, an adhesive layer or a primer is provided between the pyroelectric substance-containing layer and the metal ion-containing layer. Even without providing a layer, a layer containing a metal ion can be directly provided with a high adhesive strength on a layer containing a pyroelectric substance.

In the cooking vessel and the water heater according to the present invention, from the viewpoint of the mechanical properties of the layer, the adhesive strength (peeling resistance) of the layer, the ease of forming the layer, etc. The total thickness of the layers (the thickness of the entire layer), and the total thickness of the plurality of layers (the thickness of the entire layer) provided on the inner surface of the hot water storage unit or the inner surface of the hot water storage unit and the inner surface of the pipe of the water heater, It is preferably 5-200 μm,
More preferably 100 μm, 20 to 50 μm
Is more preferable.

The layer containing the pyroelectric substance, the layer containing the pyroelectric substance and the metal ion, and the layer containing the metal ion may be used in the cooking container of the present invention for the drinking water and drinking liquid that humans consume. Heating and heating, used in the production of cooked products, etc. Also, since the water heater of the present invention is used for heating water often used in contact with the human body, etc., excellent in safety and hygiene It must be made of a material that can form a layer that is firmly adhered to the inner surface of the main body of the cooking vessel or the inner surface of the hot water storage unit or the inner surface of the hot water storage unit and the inner surface of the pipe of the water heater for a long time. Either an organic material or an inorganic material may be used as long as it satisfies such conditions. For example, fluorine resin, silicone resin, melamine resin, phenol resin, epoxy resin, polyester resin , Polyamides, polyolefins such as polypropylene, polyvinyl chloride, polyvinylidene chloride, an organic polymer material such as polycarbonate, glass,
Examples include inorganic materials such as ceramics and metals.

The above-described layers provided on the inner surface of the hot water storage unit or the inner surface of the hot water storage unit and the inner surface of the pipe of the water heater for storing and discharging the heated hot water, and cooking involving heating and / or heating among the cooking containers of the present invention. The above-mentioned layer provided on the inner surface of the container body of the container needs to have excellent heat resistance as well as safety and hygiene, and in consideration of that point, one of the above-mentioned materials having excellent heat resistance It is good to select and use. Further, the above-described layers provided on the inner surface of the main body of the cooking vessel and the inner surface of the hot water storage portion or the inner surface of the hot water storage portion and the inner surface of the pipe of the water heater, in addition to the above-described properties such as safety, hygiene, and heat resistance, the cooking material It is made of a material that is not easily adhered to the inner surface of the body, has excellent chemical stability (chemical resistance), and is not eroded by various components contained in drinking water or liquid for drinking or various cooking materials contained in a cooking container. Is highly desirable.

From this point, the pyroelectric substance-containing layer, the pyroelectric substance and the metal ions provided on the inner surface of the main body of the cooking vessel of the present invention and the inner surface of the hot water storage unit or the inner surface of the hot water storage unit and the inner surface of the pipe of the water heater are separated. The layer containing and the layer containing metal ions are fluororesin-based layers with excellent heat resistance, chemical stability (chemical resistance), non-adhesion, water and oil repellency, safety, hygiene, etc. Preferably, there is. As the fluororesin, any of the fluororesins conventionally used for coating the inner surface of the body of the cooking vessel can be used, for example, polytetrafluoroethylene, polytrifluorochloroethylene, polyvinylidene fluoride, polyvinyl fluoride, polydifluoroethylene, and the like. Chlorodifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, ethylene-tetrafluoroethylene copolymer, ethylene-trifluorochloroethylene copolymer, tetrafluoroethylene-
Perfluoroalkyl vinyl ether copolymer, modified fluorine obtained by modifying the above-mentioned fluorine resin with a heat-resistant and highly adherent resin such as a phenol resin, an acrylic resin, an epoxy resin, a polyamideimide resin, a polyimide resin, a urethane resin, and a polyphenylene sulfide resin. Examples of the resin include a curable fluororesin made of a copolymer of a fluoroolefin (tetrafluoroethylene, trifluorochloroethylene, vinylidene fluoride, vinyl fluoride, etc.) with an alkyl vinyl ether and / or a hydroxyalkyl vinyl ether.

A layer containing a pyroelectric substance, a layer containing a pyroelectric substance and a metal ion, and a layer containing a pyroelectric substance and metal ions provided on the inner surface of the hot water storage unit or the inner surface of the hot water storage unit and the inner surface of the pipe of the cooking vessel or the water heater. The method for forming the layer containing the substance and the layer containing the metal ion, and the method for forming the above-mentioned primer layer or adhesive layer optionally provided are not particularly limited, and these layers are formed by firmly adhering them to the inner surface. Any method may be used as long as it can be performed. Generally, a method of applying a coating material or the like containing a pyroelectric substance to the inner surface of the main body of the cooking vessel or the inner surface of the hot water storage unit or the inner surface of the hot water storage unit and the inner surface of the pipe of the water heater [in the above-mentioned embodiment (a)] ), A method of applying a coating material containing a pyroelectric substance and a metal ion (preferably a metal ion supported on inorganic fine particles) [of the above-mentioned embodiment (b)], or containing a pyroelectric substance A method of applying a coating material containing a metal ion thereon after the coating material is applied (in the above embodiment (c)) is preferably adopted, and if necessary, a primer or an adhesive may be used in combination with the above-mentioned application step. Is applied.

In applying the coating material, the primer and the adhesive, the inner surface of the main body of the cooking vessel,
Depending on the shape of the inner surface of the hot water storage section of the water heater, the inner surface of the pipe, the type of material forming those inner surfaces, the type of coating material, the type of primer and adhesive, etc., a conventionally known coating method is used. Can be adopted, for example spray coating, electrostatic coating, electrodeposition coating, powder coating, dip coating,
Brush coating, roll coating and the like can be mentioned. The coating material at that time may be in any form such as a solution, a dispersed liquid, and a powder.

On the inner surface of the main body of a cooking vessel made of a metal such as stainless steel, the inner surface of a hot water storage section of a water heater or the inner surface of a pipe,
When forming a fluororesin layer containing a pyroelectric substance, a fluororesin layer containing a pyroelectric substance and a metal ion, and / or a fluororesin layer containing a metal ion, the pyroelectric substance and / or the metal ion By using any of the above-described coating methods on the inner surface of the main body of the cooking vessel or the inner surface of the hot water storage portion or the inner surface of the hot water storage portion and the pipe using a fluororesin dispersion liquid, an organic solvent solution, powder, or the like. After that, a method of sintering is preferably adopted. As the sintering temperature at that time, a temperature in the range of 230 to 440 ° C. is generally adopted depending on the type of the fluororesin and the like. Among the cooking containers of the present invention, a fluororesin layer containing a pyroelectric substance is provided on the inner surface of a cooking vessel made of a metal such as stainless steel, or a fluororesin layer containing a pyroelectric substance and metal ions is provided. Or, those provided with a fluororesin layer containing a pyroelectric substance and further provided with a fluororesin layer containing metal ions on the layer, the cooking vessel in the drinking water,
When heated or heated to accommodate a beverage liquid or cooking material, the inherent hygiene and safety of the fluororesin layer,
Excellent properties such as heat resistance, chemical stability (chemical resistance), non-adhesion, water and oil repellency, and the above-mentioned characteristics of pyroelectric substance or pyroelectric substance and metal ion contained in the fluororesin layer It has a remarkable effect that the effect of removing chlorine contained in drinking water, liquid for drinking or cooking materials, increasing pH, improving taste, texture and flavor are simultaneously exhibited.

[0039]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. In the following examples, the chlorine content in water was measured by the Oritotrige method using a residual chlorine measuring device manufactured by Shibata Chemical Instrument Co., Ltd. The sensory test in the following examples was performed by five panelists A to E shown in Table 1 below, and the texture was “very good”, “normal”, and “not good”.
Select one of the three-level evaluations for the evaluation items other than texture, such as "strongly feel", "slightly" and "do not feel". Each stage was performed by checking the number of people selected.

[0040]

[Table 1]

<< Example 1 and Comparative Example 1 >> (1) Double-sided stainless steel clad steel material [18-
10-stainless steel (SUS304L) and a three-layer steel material having a mild steel layer in the middle; a two-hand pan (about 2 mm in diameter) manufactured from Asahi Kasei Kogyo Co., Ltd.
0 cm; capacity 3 liters; bottom and side thickness approx.
5 mm).

(2) The following fluororesin primer (i), a fluororesin paint (i) containing a pyroelectric substance
i) and a fluororesin paint containing metal ions (ii
i) was prepared. -Fluororesin primer (i) : "Pyrosine Riflon DX Primer 7013 Black" manufactured by Oshima Kogyo Co., Ltd. [45.0 parts by weight of pigment (color pigment, extender, etc.) per 50.0 parts by weight of fluororesin and sedimentation prevention 5.0 parts by weight of an additive such as an agent]-Fluororesin paint containing pyroelectric substance (ii) : Add fine tourmaline powder to fluororesin paint ("Pyrosine Riflon DX Topcoat 1013 Meta" manufactured by Oshima Kogyo Co., Ltd.) Paint [5.0 parts by weight of fluororesin, 5.0 parts by weight of pigment (color pigment, pearl pigment, etc.), 5.0 parts by weight of fine tourmaline powder and other additives (surfactant, film forming agent, etc.) 2.0 parts by weight]-Fluororesin paint containing metal ions (iii) : Fluororesin paint ("Pyrosine Riflon DX" manufactured by Oshima Industries Co., Ltd. )
Topcoat 1018 META)), and a paint ("Zeomic" manufactured by Shinagawa Fuel Co., Ltd.) added with zeolite fine powder ion-exchanged (ion-substituted) by silver ions and zinc ions. Zeomic ”1.0 part by weight, pigment (color pigment, pearl pigment, etc.) 4.0, and other additives (surfactant, film forming agent, etc.) 5.0 parts by weight]

(3) The fluororesin-based primer (i) prepared in (2) is applied to the inner surface of one of the two-hand pans prepared in (1), and before the coating film is dried. After applying the pyroelectric substance-containing fluororesin paint (ii) prepared in the above (2) and drying it, the (2)
Apply the metal ion-containing fluororesin paint (iii) prepared in the above and bake it at 380 ° C. for 15 minutes. On the inner surface of the main body, the fluororesin-based primer layer (thickness: about 18 μm), pyroelectric substance-containing fluororesin A two-handed pan (hereinafter referred to as a "two-handed pan A") in which a layer (thickness of about 8 μm) and a metal ion-containing fluororesin layer (thickness of about 8 μm) were sequentially laminated was prepared (Example 1). (4) Another two-handed pan prepared in (1) above is
It was used as it was without treating the inside of the body (referred to as “untreated two-handed pan”) (Comparative Example 1)

(5) Tap water (pH 7 at 22.5 ° C.)
4, chlorine content: 1.4 ppm) was put into the two-handed pan A prepared in the above (3) in an amount of 2000 cc, and an electromagnetic cooker ("IH cooker KZ-P" manufactured by National Corporation) was used as a heat source.
8 ”) to a boiling temperature of 98.5 ° C., hold at the boiling temperature for 3 minutes, and then leave at room temperature to lower the temperature at which it can be tasted (about 40 ° C.). Was sampled simultaneously by the five panelists shown in Table 1 above,
Evaluation was made according to the evaluation items shown in Table 2 below. At the same time, the pH and chlorine content of the boiling treated water were measured at a water temperature of 22.5 ° C. The results are shown in Table 2 below. (6) A sensory test of hot water (about 40 ° C.) after heating and boiling, and measurement of pH and chlorine content (water temperature 22.5 ° C.) in the same manner as (5) except that untreated two-handed pans were used.
C), the results are as shown in Table 2 below.

(7) Tap water (pH 7 at 22.5 ° C.)
4, chlorine content 1.4 ppm) to the above two-handed pan A
000 cc and using an electromagnetic cooker ("IH cooker KZ-P8" manufactured by National Corporation) as a heat source.
Heat to a boiling temperature of 8.5 ° C., keep at the boiling temperature for 3 minutes, cool to 80 ° C., and add the hot water to 5 teapots each containing 10 g of green tea prepared in advance by 180 cc.
After being allowed to stand for 2 minutes, pour into each of the five cups of teacup, leave the bowl in the bowl, and let it cool down to about room temperature. At the same time, have the five panelists shown in Table 1 taste it at the same time. When evaluated by the evaluation items shown in Table 2, the results were as shown in Table 2. (8) A sensory test of green tea was carried out in the same manner as in (7) above, except that an untreated two-handed pan was used. The results are as shown in Table 2 below.

[0046]

[Table 2]

From the results shown in Table 2 above, the two-handed pan A of Example 1 having a layer containing a pyroelectric substance on the inner surface of the main body and further having a layer containing a metal ion on the inner layer was obtained from drinking water. It is excellent in removing chlorine from water and increasing the pH of drinking water, and when drinking water is heated (boiling) using a two-handed pan A, it is possible to obtain hot water that has no chlorine smell and is excellent in flavor and taste. Also, it can be seen that the tea using the hot water is extremely excellent in flavor and taste.

<< Examples 2 and 3 >> (1) Two two-handed pans prepared in (1) of Example 1 were prepared. (2) The same fluororesin primer (i) as used in Example 1 was applied to the inner surface of one of the two-hand pans prepared in (1) above, and before the coating film was dried, Fluororesin paint containing the same pyroelectric substance as used in Example 1 (i
i) is applied and baked at 380 ° C. for 15 minutes to form a two-hand pan having a fluororesin-based primer layer (thickness of about 18 μm) and a pyroelectric substance-containing fluororesin layer (thickness of about 8 μm) on the inner surface of the main body. Hereinafter, it is referred to as “two-handed pan B” (Example 2). (3) Another one of the two-handed pans prepared in (1) above
The same fluororesin primer (i) as used in Example 1 was applied to the inner surface of the main body of each piece, and before the coating film was dried, the following pyroelectric substance and metal ion-containing fluororesin paint (iv) ), And baked at 380 ° C. for 15 minutes, so that the fluororesin-based primer layer (having a thickness of about 18 μm)
m) and a two-handed pan having a pyroelectric substance and a metal ion-containing fluororesin layer (thickness: about 8 μm) (hereinafter referred to as “both-handed pan C”) (Example 3).

.Fluorine containing pyroelectric substance and metal ion
Resin paint (iv) : Fluororesin paint ("Pyrosin Reflon DX Topcoat 1013 Meta" manufactured by Oshima Kogyo Co., Ltd.), zeolite fine powder (ion-substituted) ion-exchanged (ion-substituted) with tourmaline fine powder and silver ion and zinc ion. ("Zeomic") (5.0 parts by weight of fluororesin, 5.0 parts by weight of trimarin fine powder, 1.0 part by weight of "Zeomic", pigment (color pigment, pearl pigment, etc.) 4.0) And 5.0 parts by weight of other additives (surfactants, film-forming agents, etc.)]

(4) Tap water (pH 7 at 22.5 ° C.)
4, chlorine content of 1.4 ppm) from the above (2) and (3)
Each of the two-handed pan B and the two-handed pan C prepared in
000 cc and using an electromagnetic cooker ("IH cooker KZ-P8" manufactured by National Corporation) as a heat source.
After heating to a boiling temperature of 8.5 ° C. and maintaining the boiling temperature for 3 minutes, the mixture was left at room temperature and dropped to a temperature at which it could be tasted (about 40 ° C.). The five panelists also had a sample tasting at the same time, and were evaluated by the evaluation items shown in Table 3 below. The results were as shown in Table 3 below.

(5) Tap water (pH 7 at 22.5 ° C.)
4, chlorine content of 1.4 ppm) from the above (2) and (3)
Each of the two-handed pan B and the two-handed pan C prepared in
000 cc each, and heated to a boiling temperature of 98.5 ° C. using an electromagnetic cooker (“IH cooker KZ-P8” manufactured by National Co., Ltd.) as a heat source, kept at the boiling temperature for 3 minutes, and then heated to 80 ° C. Cool the water and add the hot water to 10 teapots each containing 10 g of green tea prepared in advance.
cc, put for 2 minutes, pour into each of 10 cups of teacup, leave it in the bowl and let it cool down to almost room temperature. At the same time, taste it with 5 panelists shown in Table 1 above. It was as shown in Table 3 when evaluated by the evaluation items shown in Table 3.

[0052]

[Table 3]

From the results of Tables 2 and 3, it can be seen that the two-handed pan B of Example 2 having a layer containing a pyroelectric substance on the inner surface of the main body and a layer containing a pyroelectric substance and metal ions on the inner surface of the main body When drinking water is heated (boiling) using the two-handed pan C of Example 3 having water, water having excellent flavor and taste can be obtained, and hot water heated and boiled with the two-handed pan B and the two-handed pan C is used. It can be seen that the obtained tea has good flavor and taste.

<< Example 4 and Comparative Example 2 >> (1) Two-handed pan A prepared in (3) of Example 1 (a fluororesin primer layer, a pyroelectric substance-containing fluororesin layer and a metal ion-containing layer on the inner surface of the main body) 1000cc of tap water is put into a two-handed pan with a fluororesin layer in order, 5 eggs are put into the pot, boiled for 10 minutes from the water, put in water for 1 minute, cooled, and then shelled. Table 5 shows the results of evaluation by the five panelists, which were evaluated by the evaluation items shown in Table 4 below. (2) On the same untreated two-handed pan as used in Comparative Example 1,
Put 1000 cc of tap water, put 5 eggs in this, boil for 10 minutes from the water, put in water for 1 minute, cool, peel the shell, and have the 5 panelists in Table 1 above taste without salt, When evaluated by the evaluation items shown in Table 4 below, the results were as shown in Table 4.

[0055]

[Table 4]

From the results in Table 4 above, it can be seen that a boiled egg is produced using a two-handed pan A having a layer containing a pyroelectric substance on the inner surface of the main body and further having a layer containing metal ions on the layer. It can be seen that the difference in taste between white and yolk is clear, and the white is particularly transparent and has a distinct taste, and boiled eggs with excellent taste, texture and flavor can be obtained.

<< Example 5 and Comparative Example 3 >> (1) Two-handed pan A prepared in (3) of Example 1 (a fluororesin primer layer, a pyroelectric substance-containing fluororesin layer and a metal ion-containing fluorine on the inner surface) 1500cc of tap water is put into a two-handed pan having a resin layer in sequence), boiled, 0.7g of salt is added thereto, and the broccoli is boiled for 5 minutes. Five panelists sampled and evaluated according to the evaluation items shown in Table 5 below. (2) On the same untreated two-handed pan as used in Comparative Example 1,
Add 1500 cc of tap water, bring to a boil, and add 0.1 ml of salt.
After adding 7 g and boiling the broccoli for 5 minutes, the broccoli was cut out, and had the five panelists in Table 1 sample it without a seasoning, and evaluated by the evaluation items shown in Table 5 below. The results were as shown in Table 5.

[0058]

[Table 5]

From the results shown in Table 5 above, a two-handed pan A having a layer containing a pyroelectric substance on the inner surface of a cooking vessel (two-sided pan) and further having a layer containing metal ions on the layer was used. Boiled broccoli is excellent in taste, texture and flavor, shows the natural sweetness of vegetables, and can be eaten without seasoning.

Example 6 and Comparative Example 4 (1) A stainless steel frying pan (chromium content: 18% by weight, nickel content: 10% by weight) (diameter: about 25 cm; bottom and side thickness: about 2.5 mm) was used. I prepared it. (2) The same fluororesin-based primer (i) as used in Example 1 was applied to the inner surface of one of the frying pans prepared in (1) above and dried before the coating film was dried. 1
The same fluororesin paint containing pyroelectric substance as used in (ii)
After applying and drying, the same metal ion-containing fluororesin paint (iii) as used in Example 1 was applied thereon,
Firing at 380 ° C. for 15 minutes, a fluororesin primer layer (thickness of about 20 μm), a pyroelectric substance-containing fluororesin layer (thickness of about 10 μm) and a metal ion-containing fluororesin layer (thickness of about 10 μm) on the inner surface (Hereinafter referred to as “frying pan A”) was prepared (Example 6). (3) The other frying pan prepared in the above (1) was used as it was without performing inner surface treatment (referred to as “untreated frying pan”) (Comparative Example 4)

(4) Heat the frying pan A prepared in (2) above for 2 minutes, then add pork which has been pre-soaked for 10 minutes in a seasoning (liquor, soy sauce, mirin and raw ginger juice) and bake for 10 seconds. Then the lid was baked on low heat for 40 seconds, then turned over, closed again, and baked for 1 minute 30 seconds on low heat to make the pork ginger. Table 1
Table 5 shows the results of the evaluation by the five panelists. (5) Using the untreated frying pan of (3) above, make ginger pork in the same manner as in (4) above, and have it tasted by the five panelists in Table 1 above. Table 6 shows the evaluation items shown in Table 6.
Was as shown in FIG.

[0062]

[Table 6]

From the results in Table 6 above, it can be seen that the ginger pork produced using the frying pan A having a layer containing a pyroelectric substance on its inner surface and further having a layer containing metal ions on the layer is It can be seen that the meat is excellent in taste, texture, and flavor, the meat does not become hard, the meat and the seasoning blend well with each other, and a delicious grilled meat is obtained.

<< Example 7 and Comparative Example 5 >> (1) Double-sided stainless clad steel material “Cladex”
Two bowls each having a capacity of 1.5 liters were prepared. (2) The same fluororesin primer (i) as used in Example 1 was applied to the inner surface of one bowl, and the same pyroelectric as used in Example 1 before the coating film was dried. Fluororesin-containing paint (ii) containing an active substance is applied and dried, and then the same fluororesin-containing paint (iii) containing metal ions as used in Example 1 is applied thereon, and baked at 380 ° C. Having a fluororesin-based primer layer (thickness of about 20 μm), a pyroelectric resin-containing fluororesin layer (thickness of about 10 μm) and a metal ion-containing fluororesin layer (thickness of about 10 μm) (hereinafter referred to as “bowl A”) (Example 7). (3) The other bowl prepared in the above (1) was used as it was without performing inner surface treatment (referred to as “untreated bowl”) (Comparative Example 5)

(4) Bowl A produced in (2) above
20 g of egg yolk, 150 g of corn oil, 20 g of vinegar, 5 g of sugar, 3 g of salt, and 2 g of seasonings (mustard, pepper, umami, etc.) are stirred and emulsified using an electric household stirrer. To make mayonnaise. The mayonnaise thus obtained was sufficiently emulsified, did not cause separation of components, had a fine texture, and was excellent in taste. (5) Mayonnaise was produced in the same manner as in (4) except that an untreated bowl was used. The mayonnaise obtained in this way is different from the mayonnaise obtained in (4) above,
The emulsification was insufficient, the texture was coarse, and the taste was poor.

[0066]

When the drinking water or drinking liquid is put into the cooking container of the present invention and heated, heated, stored or cooked, the removal of chlorine contained in drinking water or drinking liquid is promoted,
As H rises, the chlorine odor of drinking water and drinking liquid is eliminated, and water and drinking liquid with good taste, taste and flavor are obtained. Furthermore, when the cooking container of the present invention is used to cook various ingredients such as eggs, vegetables, cereals, beans, potatoes, meat, seafood, and processed products using them, the taste, texture, and flavor are improved. It is possible to obtain an excellent cooked product. For example,
When a boiled egg is made using a cooking vessel having the above-mentioned specific layer, the difference in taste between white and yolk is clearer than that of a boiled egg made using a normal cooking vessel, and especially the white You can get boiled eggs that are clear and delicious. In addition, when vegetables are boiled using the cooking container of the present invention, the inherent sweetness of the vegetables is enhanced, and boiled vegetables that can be eaten delicious without seasonings are obtained. In addition, when grilled meat is prepared using the cooking container of the present invention, the meat does not become hard, and a delicious grilled meat in which the meat and the seasoning blend well with each other can be obtained. In addition, when an emulsified food such as mayonnaise is prepared using the cooking container of the present invention, emulsification is promoted, and a fine emulsified food having a fine texture is obtained.

Further, when the water heater of the present invention is used,
The removal of chlorine contained in water is promoted and the pH rises, so that hot water with no chlorine odor and good taste and flavor can be obtained. Therefore, the hot water obtained by using the water heater of the present invention can be effectively used for beverages, cooking (cooking, dishwashing, etc.), washing surfaces, bathing, cleaning, and other uses.

Claims (11)

[Claims] 1. A cooking container having a pyroelectric substance-containing layer, a pyroelectric substance and a metal ion-containing layer, or a pyroelectric substance-containing layer on the inner surface of a main body of a cooking vessel. And a layer containing a metal ion on the layer. 2. The cooking container according to claim 1, which is a cooking container that involves heating or heating. 3. The cooking container according to claim 1, wherein the cooking container is a storage container for storing and using drinking water, a liquid for drinking, or a cooking material. 4. The cooking container according to any one of claims 1 to 3, which is a pot, a kettle, a pot, a pot, a frying pan, a bowl, a water bottle, or a boiled egg maker. 5. The metal ion according to claim 1, wherein the metal ion is an ion of at least one metal selected from silver, zinc, copper, gold, platinum, iron, nickel and cobalt.
The cooking container according to Item. 6. The cooking container according to claim 1, wherein the metal ions are supported on inorganic particles. 7. A cooking container having a fluororesin layer containing a pyroelectric substance, a fluororesin layer containing a pyroelectric substance and metal ions, or containing a pyroelectric substance on the inner surface of the main body of the cooking vessel. The cooking container according to any one of claims 1 to 6, further comprising a fluorine resin layer containing a metal ion and a fluorine resin layer containing metal ions on the layer. 8. A method in which a layer containing a pyroelectric substance or a layer containing a pyroelectric substance and metal ions is provided on the inner surface of the hot water storage unit or on the inner surface of the hot water storage unit and the inner surface of the pipe of the water heater. Alternatively, a water heater having a layer containing a pyroelectric substance and further having a layer containing metal ions on the layer. 9. The water heater according to claim 8, wherein the metal ions are ions of at least one metal selected from silver, zinc, copper, gold, platinum, iron, nickel and cobalt. 10. The water heater according to claim 8, wherein the metal ions are supported on the inorganic particles. 11. A fluororesin layer containing a pyroelectric substance or a fluororesin layer containing a pyroelectric substance and metal ions on the inner surface of a hot water storage unit, or on the inner surface of a hot water storage unit and the inner surface of a pipe of a water heater. The water heater according to any one of claims 8 to 10, further comprising: a fluororesin layer containing a pyroelectric substance; and a fluororesin layer containing metal ions on the layer.