KR20040062911A - The manufacturing method of glass - Google Patents

Abstract

PURPOSE: A method for preparing glass is provided, to obtain a glass which has heat insulation and a deodorizing effect, screens electromagnetic wave, and has no surface tension. CONSTITUTION: The method comprises the steps of heating a plutonic granite powder with a velocity of 250-300 deg.C/hour to 1,400-1,900 deg.C, and maintaining the temperature to be constant for a day; heating the powder to 2,300 deg.C or more and maintaining the temperature to be constant for 12 hours or more; cooling slowly it with a velocity of 0.5-5 deg.C/hour to a room temperature; and cutting and post-working the cooled one. The plutonic granite powder comprises at least one selected from the group consisting of a plutonic granite A which comprises 79.76 wt% of SiO2, 9.87 wt% of Al2O3, 0.21 wt% of F32O3, 3.79 wt% of K2O, 2.81 wt% of Na2O, 1.59 wt% of CaO, 0.86 wt% of MgO, 0.5-2 ppm of Ge and 1.11 wt% of the rest; a plutonic granite B which comprises 73.41 wt% of SiO2, 14.56 wt% of Al2O3, 1.13 wt% of Fe2O3, 4.13 wt% of K2O, 2.48 wt% of Na2O, 2.28 wt% of CaO, 0.72 wt% of MgO, 0.5-2 ppm of Ge and 1.29 wt% of the rest; and a plutonic granite C which comprises 73.53 wt% of SiO2, 12.52 wt% of Al2O3, 4.76 wt% of Fe2O3, 3.78 wt% of K2O, 2.07 wt% of Na2O, 1.56 wt% of CaO, 0.51 wt% of MgO, 0.5-2 ppm of Ge and 1.27 wt% of the rest.

Description

The manufacturing method of glass

The present invention relates to a method for manufacturing glass, and more specifically, SiO ₂ 79.76wt%, Al ₂ O ₃ 9.87wt%, Fe ₂ O ₃ 0.21wt%, K ₂ O 3.79wt%, Na ₂ O 2.81wt %, CaO 1.59wt%, MgO 0.86wt% and the remainder 1.11wt% containing 0.5-2ppm germanium, deep granite (hereinafter referred to as "deep granite A"), SiO ₂ 73.41wt%, Al ₂ O ₃ 14.56wt%, Fe ₂ O ₃ 1.13wt%, K ₂ O 4.13wt%, Na ₂ O 2.48wt%, CaO 2.28wt%, MgO 0.72wt% and the remainder 1.29wt% containing 0.5 ~ 2ppm germanium Deep granite (hereinafter referred to as "deep granite B"), SiO ₂ 73.53 wt%, Al ₂ O ₃ 12.52 wt%, Fe ₂ O ₃ 4.76 wt%, K ₂ O 3.78 wt%, Na ₂ O 2.07 wt%, One or more deep granite powders of deep granite (hereinafter referred to as "deep granite C") composed of 1.56 wt% of CaO, 0.51 wt% of MgO and 1.27 wt% of the residual amount containing 0.5 to 2 ppm of germanium are introduced into the furnace, and After raising the temperature to 1,400 to 1,900 ° C. at a temperature increase rate of 300 ° C./hour for the first time, the primary temperature rise temperature was constantly 2 to 5% by weight of borax, 0.5 to 2% by weight of boric acid, and 2 to 5% by weight of sodium carbonate were added to the weight of the deep granite powder used immediately after the temperature was raised to the first elevated temperature. After melting the granite granite itself, the temperature is raised to 2300 ° C. or more and maintained for at least 12 hours. After cooling slowly at a rate of 0.5 to 5 ° C./hour to cool to room temperature, the furnace is separated, the product is cut and processed. It relates to a manufacturing method of glass.

Glass is a generic term for objects with high transparency that are formed by melting silica sand, sodium carbonate, calcium carbonate, etc. at high temperatures, and in general, when the molten liquid is cooled, it solidifies at a certain temperature to crystallize. Viscosity gradually increases as the temperature decreases without crystallization, and later becomes a solid solid. The amorphous solid thus obtained is generally said to be in a glass state, and in particular, it is called glass in such a state as an inorganic substance.

There are various kinds of inorganic materials that can be glass. Elements include selenium and sulfur, oxides such as silicon, boron and germanium, oxide salts, sulfides, selenides and halides. Although glass is typical, oxide glass such as borate glass and phosphate glass has been put into practical use, and glass such as sulfide and selenide has also been studied for special purposes.

In general, glass is manufactured using SiO ₂ as a main raw material, and is used for various uses such as window glass, plate glass, and bottle glass because of its transparency, excellent light transmittance, and low thermal conductivity. The structure of such glass is not as well known as most metals, it has a unique state, called the glass phase, and is defined as a 'melt product that is cooled to a hard state without crystallization'.

On the other hand, glass is generally manufactured through raw material preparation → weighing → batch mixing → molding → slow cooling → inspection and quality control → secondary process → inspection → packaging. Special processes may be added, such as strengthening, laminating, cladding, sand blasting, etching, metalling, and the like.

In addition, the glass can be made of glass of different colors by adding different colorants to the batch. For example, most metal oxides dissolve in glass to form colored transparent glass, and sulfur and selenium components appear colloidally in the glass, giving transparency to the glass, and opal glass gives fine fluorine to the glass. It is formed by having a crystalline content of the compound.

Conventional glass is given only the intrinsic properties and effects of glass, but no other beneficial properties. However, Patent No. 100249929, a prior application patent such as the inventors of the present invention, discloses the deep granite component and extremely small amounts of deep granite mixed with glass. Molecular structure of the remaining moisture causes mutual resonance effect to effectively absorb the heat source of the air, and reaches the maximum absorption of energy in the wavelength range of 4 ~ 2μ, not only obtain the cold weather and warming effect, but also the deep granite component Glass that expresses the functions of blocking or deodorizing and deodorizing, and protecting the various substances and skin inside by reflecting the durable rays of paper harmful to the human body such as ultraviolet rays by far infrared rays emitted by the deep granite component itself. Is described.

However, the glass described in the patent has a slight effect because only 1 to 3% by weight of the granite granules are used, and glass having both the effects of expressing the granite granules is difficult to be produced, and the glass and the granulite granules are homogeneous. There was a disadvantage in that the characteristics such as compressive strength is lowered due to the lack of mixing.

Accordingly, an object of the present invention is to use only the deep granite, but the physical and chemical properties are superior to that of ordinary glass, the thermal insulation effect is excellent, the electromagnetic wave blocking effect is expressed, as well as the deodorizing, deodorizing function, the material inside the glass The present invention provides a method of manufacturing a glass that can protect the skin, has no surface tension, and does not naturally form frost and dew on the surface, and has an effect of selectively passing light.

In order to achieve the above object as well as other objects that can be easily expressed in the present invention, SiO ₂ 79.76wt%, Al ₂ O ₃ 9.87wt%, Fe ₂ O ₃ 0.21wt%, K ₂ O 3.79wt%, Na ₂ Deep granite A, SiO ₂ 73.41 wt%, Al ₂ O ₃ 14.56 wt%, Fe ₂ O consisting of 2.81 wt% O, 1.59 wt% CaO, 0.86 wt% MgO and 1.11 wt% of the residual amount containing 0.5 to 2 ppm of germanium ₃ 1.13 wt%, K ₂ O 4.13 wt%, Na ₂ O 2.48 wt%, CaO 2.28 wt%, MgO 0.72 wt% and Austenitic Granite B, SiO ₂ 73.53 wt%, Al ₂ O ₃ 12.52 wt%, Fe ₂ O ₃ 4.76 wt%, K ₂ O 3.78 wt%, Na ₂ O 2.07 wt%, CaO 1.56 wt%, MgO 0.51 wt% and germanium 0.5 to 2 ppm One or more deep granite powders of the deep granite C composed of the residual amount of 1.27 wt% are added to the furnace, and the first temperature is elevated to 1400 to 1900 ° C. at a temperature rising rate of 250 to 300 ° C./hour, and then the first elevated temperature is constantly Keep it at night but use it immediately after raising the temperature to the first temperature Is added 2 to 5% by weight of borax, 0.5 to 2% by weight of boric acid, and 2 to 5% by weight of sodium carbonate by melting the granite granite itself, and then heated to 2300 ° C or higher. After maintaining for more than 12 hours, and then cooled slowly to room temperature at a rate of 0.5 ~ 5 ℃ / hour, the glass is manufactured by the method of separating the furnace, cutting the product and post-processing, so the effect of cold protection and insulation is excellent and electromagnetic waves As well as the blocking effect, it has deodorizing and deodorizing functions, protects the material and skin inside the glass, and has no surface tension, so that frost and dew do not naturally form on the surface, and selectively pass light. I could get the glass.

The present invention is described in more detail as follows.

Glass manufacturing method according to the invention is SiO ₂ 79.76wt%, Al ₂ O ₃ 9.87wt%, Fe ₂ O ₃ 0.21wt%, K ₂ O 3.79wt%, Na ₂ O 2.81wt%, CaO 1.59wt%, Deep granite A, SiO ₂ 73.41wt%, Al ₂ O ₃ 14.56wt%, Fe ₂ O ₃ 1.13wt%, K ₂ O 4.13wt, consisting of 0.86wt% MgO and 1.11wt% of the residual amount containing 0.5 ~ 2ppm germanium %, Na ₂ O 2.48wt%, CaO 2.28wt%, MgO 0.72wt% and the remainder 1.29wt% containing 0.5 ~ 2ppm germanium, deep granite B, SiO ₂ 73.53wt%, Al ₂ O ₃ 12.52wt% Sintered granite C consisting of 4.76 wt% Fe ₂ O _3, 3.78 wt% K ₂ O, 2.07 wt% Na ₂ O, Ca56 1.56 wt%, MgO 0.51 wt% and the balance 1.27 wt% containing 0.5 to 2 ppm germanium One or more kinds of deep granite powder is added to the furnace, and the first temperature is elevated to 1400 to 1900 ° C. at a heating rate of 250 to 300 ° C./hour, and then the temperature is maintained at a constant temperature for 1 day. 2 to 5% by weight of borax, 0. 5 to 2% by weight of boric acid and 2 to 5% by weight of sodium carbonate are added to melt the deep granite, and then the temperature is raised to 2300 ° C or higher and maintained for 12 hours or more, and then 0.5 to 5 ° C / hour After slow cooling to proportion and cooling to room temperature, the furnace is characterized by separating the product, cutting and post-processing.

In addition, the method for producing a glass according to the present invention contains a large amount of water in order to produce a homogeneous glass by supplying water to condense the glass when the temperature is maintained overnight after melting the deep granite When sweet potatoes, potatoes and chestnuts are administered, moisture is prevented from penetrating into the glass due to the high temperature, preventing evaporation and supplying water into the glass.

The deep granite used in the present invention is SiO ₂ 79.76wt%, Al ₂ O ₃ 9.87wt%, Fe ₂ O ₃ 0.21wt%, K ₂ O 3.79wt%, Na ₂ O 2.81wt%, CaO 1.59wt%, MgO Deep granite A, SiO ₂ 73.41 wt%, Al ₂ O ₃ 14.56 wt%, Fe ₂ O ₃ 1.13 wt%, K ₂ O 4.13 wt% , Deep granite B or SiO ₂ 73.53wt%, Al ₂ O ₃ 12.52wt%, consisting of 2.48wt% Na ₂ O, 2.28wt% CaO, 0.72wt% MgO and the remaining 1.29wt% containing 0.5-2ppm germanium, As a deep granite rock C composed of 4.76 wt% Fe ₂ O _3, 3.78 wt% K ₂ O, 2.07 wt% Na ₂ O, Ca56 1.56 wt%, MgO 0.51 wt% and the balance 1.27 wt% containing 0.5 to 2 ppm germanium. According to the use, it is preferable to select and use at least 1 type or more of 3 types of adipose granite.

The deep granite used in the present invention is a pure magma in the crust is cooled in the reduced state, each having a unique color, the color is a unique color formed by cooling the high temperature magma of 4000 ℃ or more, the far-infrared emissivity is 0.90 or more Far-infrared emissivity changes according to the type of deep granite, the mixing method, and the mixing ratio used, so that glass of various characteristics and uses can be manufactured. That is, the deep granite A, the deep granite B, the deep granite C can be used independently, two or more kinds may be used in combination, and when used in combination, each of the deep granite is preferably used in more than 30wt%.

The granite granules used in the present invention may be added in various granularities depending on the quality of the glass to be manufactured, but should be used having a particle size of 100 nm or less in consideration of the surface smoothness of the glass and various required properties, and the particle size exceeding 100 nm. In this case, not only complete vitrification is performed but also it is difficult to achieve the desired effect completely.

The deep granite is heated to 705 ° C. and maintained for 5 minutes, then maintained at 625 ° C. for 5 minutes, held at 580 ° C. for 30 minutes, and then heat-treated in advance by maintaining at 705 ° C. for 10 minutes.

The above-mentioned heat-treated granite granite is put in a furnace and heated to 1400-1900 ° C at a temperature rising rate of 250-300 ° C / hour, and then the temperature is kept constant overnight, but immediately after the temperature rises to the first temperature- raising temperature. 2-5% by weight of borax, 0.5-2% by weight of boric acid, and 2-5% by weight of sodium carbonate are added to the core of granite to melt the cored granite itself.

When raising the temperature of the granite granite, if the temperature is raised to a temperature lower than 250 ° C./hour, the moisture contained in the granite granite is not only evaporated during the temperature rising but also the binding water of ions is removed to change the characteristics of the granite granite. In this case, when the temperature is raised to an elevated temperature exceeding 300 ° C./hour, there is a problem that the homogenous granite powder is not homogeneously melted and, in some cases, exists in the form of fine particles.

In the initial melting, the primary elevated temperature is 1400-1900 ° C., particularly preferably 1600-1900 ° C., and when the primary elevated temperature is less than 1400 ° C., the deep granite powder is not homogeneously dissolved and 1900 ° C. If it exceeds, there is a disadvantage that the homogeneous product cannot be obtained because the convection of the deep granite rock that is fused does not occur.

When the temperature rises to the first elevated temperature, 2 to 5 wt% borax, 0.5 to 2 wt% boric acid, and 2 to 5 wt% sodium based on the weight of the deep granite powder used to facilitate vitrification. Inject carbonate (Sodium carbonate). Although many components to help vitrification are known, borax, boric acid, sodium carbonate was found to be effective through repeated experiments in the present invention. lost.

As described above, after the temperature is raised to the temperature at which vitrification is performed, it is maintained overnight so that all of the deepening granite in the furnace is slowly convection, so that vitrification is completed.

At this time, if convection does not occur well, a homogeneous glass cannot be obtained. Therefore, the glass is selected from the group consisting of sweet potatoes, potatoes, and chestnuts containing a large amount of water in order to produce a homogeneous glass by supplying moisture to convex the glass. Administering at least one or more types of water prevents water from penetrating into the glass and prevents evaporation due to the high temperature, so that water is supplied into the glass.

The dose of sweet potato, potato or chestnut is not particularly limited, but it is effective to administer about 1 to 5 kg per hour, and it is preferable to use a harder one with a higher temperature.

As described above, even when the sweet potato, potato or chestnut is administered, the temperature of the vitrified deep granite melt is high, so that the components contained in the sweet potato, potato or chestnut are completely burned and the water is subsequently convexed and completely removed.

When the above-described process is performed overnight, vitrification is completely performed. The temperature is raised to 2300 ° C. and maintained at a temperature for 12 hours to completely remove residual suspended matter or substances that inhibit the transparency of the glass, and then slowly cool it slowly.

The cooling temperature at the time of slow cooling is preferably 0.5 to 5 ° C., and the slow cooling rate can be adjusted according to the use and characteristics of the glass to be produced.

After cooling to room temperature and cooling to room temperature, the furnace is separated to obtain an integrally prepared glass, which is cut to an appropriate size according to the use, and then subjected to post-processing such as reinforcement, laminate, cladding, sand blasting, etching, metallizing, and the like. To obtain a finished glass product.

When the glass is manufactured in the above manner, the glass is manufactured only with the deep granite, which exhibits various effects and characteristics. Thus, the glass is not only more effective than the glass with the small amount of granite, but also contains a small amount of the deep granite powder. There is an advantage that can completely solve the problems, such as strength degradation that can occur in the glass.

The following examples illustrate the invention in more detail, but do not limit the scope of the invention.

Example 1

SiO ₂ 79.76wt%, Al ₂ O ₃ 9.87wt%, Fe ₂ O ₃ 0.21wt%, K ₂ O 3.79wt%, Na ₂ O 2.81wt%, CaO 1.59wt%, MgO 0.86wt% and germanium from 0.5 to Aromatic granite A, SiO ₂ 73.41 wt%, Al ₂ O ₃ 14.56 wt%, Fe ₂ O ₃ 1.13 wt%, K ₂ O 4.13 wt%, Na ₂ O 2.48 wt%, Deep granite B, SiO ₂ 73.53wt%, Al ₂ O ₃ 12.52wt%, Fe ₂ O ₃ 4.76wt%, which is composed of 2.28wt% CaO, 0.72wt% MgO and 1.29wt% of germanium containing 0.5 ~ 2ppm. After weighing 150 kg each of deep granite C composed of 3.78wt% of K ₂ O, 2.07wt% of Na ₂ O, 1.56wt% of CaO, 0.51wt% of MgO and the remaining 1.27wt% of 0.5-2 ppm of germanium, After heating to 705 ℃ for 5 minutes, and then maintained at 625 ℃ for 5 minutes, 580 ℃ for 30 minutes, and then pre-heat treated by maintaining at 705 ℃ for 10 minutes, then pulverized to a particle size of 100nm or less It is prepared with a powder having.

Each powder was prepared into a furnace, heated to 1700 ° C. at a temperature increase rate of 250 ° C./hour, and then 4 wt% borax, 1 wt% boric acid, and 4 wt% sodium based on the total weight of the deep granite powder used. After adding carbonate (Sodium carbonate) to melt the deep granite itself, the temperature was kept constant and maintained overnight, and then the temperature was raised to 2300 ° C. for at least 12 hours, and then slowly cooled to room temperature at a rate of 2 ° C./hour. After the separation, the furnace was separated, cut into a thickness of 1 cm, and the edge was cut into squares to prepare a flat glass.

Various properties of the produced glass were evaluated and measured, and are shown in Table 1.

Comparative Example 1

SiO ₂ 80.0wt%, Al ₂ O ₃ 5wt%, SiC 2wt%, Ferrite 3wt% and SiO ₂ 79.76wt%, Al ₂ O ₃ 9.87wt%, Fe ₂ O ₃ 0.21wt%, K ₂ O 3.79 Sintered granite A, SiO ₂ 73.41 wt%, Al ₂ O ₃ 14.56 wt% consisting of 2.81 wt% of Na ₂ O, 1.59 wt% of CaO, 0.86 wt% of MgO and 1.11 wt% of the residue containing 0.5 to 2 ppm of germanium. %, Fe ₂ O ₃ 1.13wt%, K ₂ O 4.13wt%, Na ₂ O 2.48wt%, CaO 2.28wt%, MgO 0.72wt% and remainder 1.29wt% containing germanium 0.5-2ppm B, 73.53 wt% SiO _2, 12.52 wt% Al ₂ O _3, 4.76 wt% Fe ₂ O ₃ , K ₂ O 3.78 wt%, Na ₂ O 2.07 wt%, CaO 1.56 wt%, MgO 0.51 wt% and germanium After mixing the same amount of deep granite C consisting of a residual amount of 1.27wt% containing 0.5 to 2ppm in the same amount, and then heated to 705 ℃ and maintained for 5 minutes, and then held for 5 minutes at 625 ℃, after maintaining for 30 minutes at 580 ℃ 10 wt% of deep granite powder prepared by heat treatment in advance, and then pulverized to a powder of 200 mesh. Putting into a port, to thereby prepare a colored plate glass and molded under pressure to a pressure of the heating temperature of 300 ℃ / hour heating rate of up to 1300 ℃ was maintained 2 hours, then, 100kg / ㎠.

Various properties of the produced glass were evaluated and measured, and are shown in Table 1.

Example 1 Comparative Example 1 Room temperature when outdoor temperature is 10 ℃ 15 ℃ 12 ℃ The tensile strength 1,053kg / ㎠ 1,497kg / ㎠ Far Infrared Emissivity 0.905 0.855

As can be seen from Table 1, the glass of the present invention was superior in terms of various effects than glass to which a small amount of granite granite component was added.

As described above, in the present invention, SiO ₂ 79.76wt%, Al ₂ O ₃ 9.87wt%, Fe ₂ O ₃ 0.21wt%, K ₂ O 3.79wt%, Na ₂ O 2.81wt%, CaO 1.59wt%, MgO 0.86 Deep granite A, SiO ₂ 73.41 wt%, Al ₂ O ₃ 14.56 wt%, Fe ₂ O ₃ 1.13 wt%, K ₂ O 4.13 wt%, Deep granite B, SiO ₂ 73.53 wt%, Al ₂ O ₃ 12.52 wt%, Fe consisting of 2.48 wt% Na ₂ O, 2.28 wt%, MgO 0.72 wt% and the remaining 1.29 wt% containing 0.5 to 2 ppm germanium _{1 out of the} deep granite C composed of ₂ O ₃ 4.76 wt%, K ₂ O 3.78 wt%, Na ₂ O 2.07 wt%, CaO 1.56 wt%, MgO 0.51 wt% and the balance 1.27 wt% containing 0.5 to 2 ppm germanium More than three kinds of deep granite powder is added to the furnace, and the temperature is first increased to 1400 to 1900 ° C at a temperature rising rate of 250 to 300 ° C / hour, and then the first temperature is kept constant overnight. Borax, 0.5 to 5% by weight, based on the weight of the deep granite powder used 2% by weight of boric acid and 2-5% by weight of sodium carbonate were added to melt the deep granite, and the temperature was raised to 2300 ° C or higher and maintained for 12 hours or longer, followed by a ratio of 0.5-5 ° C / hour. After cooling to room temperature and cooling to room temperature, the glass is manufactured by separating the furnace, cutting the product and post-processing, so that the effect of cold protection and heat insulation is excellent, the electromagnetic wave blocking effect is not only expressed, but also deodorizing and deodorizing function. It is possible to obtain a glass that can protect the material and the skin, has no surface tension, and naturally does not form frost and dew on the surface, and selectively transmits light.

That is, when comparing the glass of the present invention and the glass with 10% by weight of tempered granite, the glass of the present invention maintains a temperature higher than 3 ° C higher than the glass with the 10% by weight of tempered granite when there is a temperature difference between indoor and outdoor. It has the effect of blocking ultraviolet rays during solar heat and keeps the temperature of the whole glass uniform. Since the deep granite is a room temperature infrared heating element, it is excellent in absorbing or radiating far infrared rays, especially 4 ~ 25μ rays of sunlight, so it is not only strong evaporation effect of moisture or moisture but also excellent sliding of moisture. This is because the degree of integration increases the activity of water at the level of 5 to 15 water molecules, and it is effective to block rays of other wavelengths such as electromagnetic waves and ultraviolet rays due to the far-infrared radiation effect.

Claims (3)

SiO ₂ 79.76wt%, Al ₂ O ₃ 9.87wt%, Fe ₂ O ₃ 0.21wt%, K ₂ O 3.79wt%, Na ₂ O 2.81wt%, CaO 1.59wt%, MgO 0.86wt% and germanium at 0.5 ℃ Aromatic granite A, SiO ₂ 73.41 wt%, Al ₂ O ₃ 14.56 wt%, Fe ₂ O ₃ 1.13 wt%, K ₂ O 4.13 wt%, Na ₂ O 2.48 wt%, Deep granite B, SiO ₂ 73.53wt%, Al ₂ O ₃ 12.52wt%, Fe ₂ O ₃ 4.76wt%, which is composed of 2.28wt% CaO, 0.72wt% MgO and 1.29wt% of germanium containing 0.5 ~ 2ppm. One or more aromatized granite powders of aroma granite C consisting of 3.78wt% of K ₂ O, 2.07wt% of Na ₂ O, 1.56wt% of CaO, 0.51wt% of MgO and 1.27wt% of the residual amount containing 0.5 to 2ppm of germanium It was charged, and the temperature was first increased to 1400 to 1900 ° C at a temperature increase rate of 250 to 300 ° C / hour, and then the temperature was kept constant overnight, and then the temperature was raised to 2300 ° C or more and maintained for 12 hours or more, and then 0.5 to 5 ° C. After cooling slowly to room temperature at the rate of / hour, the furnace is separated and the product is cut. Method for producing a glass, characterized in that said post-processing. According to claim 1, 2 to 5% by weight of borax, 0.5 to 2% by weight of boric acid, 2 to 5% by weight of sodium carbonate, based on the weight of the deep granite powder which is used immediately after the temperature is raised to the first elevated temperature Method for producing a glass, characterized in that the input. The method according to claim 1, wherein at least one selected from the group consisting of sweet potatoes, potatoes, and chestnuts containing a large amount of water is administered when the temperature of the deep granite is melted to maintain the elevated temperature overnight. Manufacturing method.