KR102363060B1 - Brass coffee dripper and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a brass coffee dripper and a manufacturing method thereof, and more particularly, to a brass coffee dripper which has excellent mechanical strength and hardness, to be prevented from being easily broken or peeled, can be used hygienically due to being easily washed, and allows water to come in contact with coffee beans for a long time, to sufficiently extract the aroma and taste of the coffee beans, and a manufacturing method thereof.

Description

Brass coffee dripper and manufacturing method thereof

The present invention relates to a brass coffee dripper and a method for manufacturing the same, and more particularly, excellent in both mechanical strength and hardness, which can prevent easily breaking or peeling, can be easily washed and used hygienically, and can be used sanitarily. It relates to a brass coffee dripper capable of sufficiently extracting the aroma and taste of beans by bringing them into contact with coffee beans for a long time, and to a manufacturing method of the brass coffee dripper.

Hand drip refers to a method of extracting coffee beans by grinding them and filtering them with water. This is a method of brewing coffee by pouring water into coffee by hand without using a machine. The extraction method requires a tool called a dripper, and when extracting coffee using a dripper, the aroma of coffee appears in various ways depending on the amount of water in the process of pouring water, the method and angle of pouring water, and the like.

At this time, in order to obtain the best coffee taste, the amount and temperature of water are typically adjusted in extracting the coffee liquid from the coffee bean powder, the pulverized size and amount of the coffee bean powder, and the angle of pouring water in consideration of the filtration conditions of the coffee dripper structure , speed, etc.

As described above, the reason the taste of coffee changes is determined by how much coffee powder is in contact with water. . Therefore, it is the reason why the structure of the dripper becomes important in the taste of coffee.

In general, the structure of a dripper consists of an extraction hole, ribs, and extraction part, and the amount and speed of water to be extracted is affected by the size and number of extraction holes and ribs. During coffee dripping, as the filter is wet with water, the coffee liquid is in close contact with the inner wall of the dripper, and the penetration of the extracted coffee liquid is delayed. It makes it easy to come out of the extraction well, and the extraction speed is also determined by the size and number of wells. In addition, the extraction unit has various angles and shapes to change the concentration of the coffee liquid by changing the stacking height of the coffee bean powder and the flow rate of the permeated water.

However, the existing drippers have one large extraction hole at the bottom, and there is a protruding rib extending radially from the extraction hole along the inner wall. can't

In addition, since all of these drippers are made of ceramics or plastic, they may be broken or scratched when used multiple times, which may cause changes in coffee taste, or may cause sanitary problems.

Therefore, non-professionals and unskilled people, not skilled baristas, can easily brew the best coffee without complicated processes such as water flow control, steaming, and water volume control. Research on a new coffee dripper that can be used hygienically for a long time while keeping it clean is required.

Republic of Korea Patent Publication No. 10-1382604

The present invention provides a method for manufacturing a coffee dripper that can be used hygienically for a long period of time without breaking or peeling, in which non-specialists can easily and uniformly extract the aroma and taste of coffee as to solve the above problems want to

These and other objects and advantages of the present invention will become apparent from the following description of preferred embodiments.

The object is to prepare molten iron by melting copper and tin; Inverted cone-shaped brass casting in which the molten molten iron is poured into the mold, the mold is cooled, the mold is cooled, the upper part is opened and the upper part is opened, and the coffee outlet is formed on the lower surface. forming a; dipping the formed brass casting into a ceramic coating composition; and drying the brass casting immersed in the ceramic coating composition to obtain a brass coffee dripper;

Specifically, the manufacturing of the molten iron may be performed by heating 60 to 80% by weight of copper and 20 to 40% by weight of tin in a temperature range of 1,000°C to 1,400°C for 1 hour to 12 hours. .

Specifically, the ceramic coating composition is a ceramic powder comprising at least one selected from the group consisting of aluminum oxide, silicon carbide, aluminum nitride, cermet, zirconia, yttria stabilized zirconia, mullite, quartz, and combinations thereof. ; silicone binder; and an organic solvent.

According to the present invention, it is possible to prevent breakage or peeling when using a conventional coffee dripper due to excellent mechanical hardness as well as strength, and a brass coffee dripper that can be used hygienically because it is easy to clean can be manufactured.

In addition, according to the present invention, it is possible to sufficiently extract the aroma and taste of the coffee beans by slowing the extraction rate of coffee and allowing the water to contact the beans for a long time. You can easily brew the best coffee without having to go through complicated processes such as , adjusting the amount of water.

However, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a flowchart showing a method of manufacturing a brass coffee dripper according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings of the present invention. It will be apparent to those of ordinary skill in the art that these examples are merely presented by way of example to explain the present invention in more detail, and that the scope of the present invention is not limited by these examples. .

Further, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and in case of conflict, this specification, including definitions will take precedence.

In order to clearly explain the invention proposed in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are assigned to similar parts throughout the specification. And, when a part "includes" a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise stated. In addition, "unit" described in the specification means one unit or block that performs a specific function.

In each step, identification numbers (first, second, etc.) are used for convenience of description, and identification numbers do not describe the order of each step, and each step does not clearly describe a specific order in context. It may be performed differently from the order specified above. That is, each step may be performed in the same order as the specified order, may be performed substantially simultaneously, or may be performed in the reverse order.

Hereinafter, embodiments and examples of the present application will be described in detail with reference to the accompanying drawings. However, it may not be limited to these embodiments and examples and drawings of the present application.

One aspect of the present application includes the steps of preparing molten iron by melting copper and tin; Inverted cone-shaped brass casting in which the molten molten iron is poured into the mold, the mold is cooled, the mold is cooled, the upper part is opened and the upper part is opened, and the coffee outlet is formed on the lower surface. forming a; dipping the formed brass casting into a ceramic coating composition; and drying the brass casting immersed in the ceramic coating composition to obtain a brass coffee dripper.

According to the method for manufacturing a brass coffee dripper according to the present invention, it is possible to sufficiently extract the aroma and taste of the coffee beans by slowing the extraction speed of the coffee and allowing the water to contact the beans for a long time. You can easily brew the best coffee without any complicated processes such as adjusting the water stream, steaming, and adjusting the amount of water. In addition, it is possible to prevent breaking or peeling when using a conventional coffee dripper because of its excellent mechanical hardness as well as strength, and it is possible to manufacture a coffee dripper that can be used hygienically because it is easy to clean.

Hereinafter, a method for manufacturing a brass coffee dripper according to the present invention will be described in detail with reference to FIG. 1 .

First, molten iron is produced by melting copper and tin. The copper and tin included in the molten iron may include about 60 to about 80 wt% of copper and about 20 to about 40 wt% of tin, and the copper and tin are prepared at a temperature range of about 1,000 °C to about 1,400 °C. It may be carried out by heating for about 1 hour to about 12 hours. If the amount of copper in the molten iron is less than about 60% by weight or the amount of tin exceeds about 40% by weight, the strength is weak and can be easily damaged, and when copper exceeds about 80% by weight or tin is less than about 20% by weight, corrosion and discoloration This can easily happen. In addition, when the heating is performed for less than about 1 hour at less than 1,000 ° C, the melting of copper may not be sufficiently performed, so that the mechanical strength of the brass coffee dripper to be manufactured later may decrease, and the heating temperature at a temperature exceeding 1,400 ° C. If it is performed for more than about 12 hours, overheating may cause a phenomenon in which tin is lost in the form of oxide. Preferably, the molten iron may be prepared by heating about 78 wt% of copper and about 22 wt% of tin at a temperature range of about 1,000° C. to about 1,200° C. for about 1 hour to about 12 hours.

Next, the molten molten iron is injected into the mold, and the mold is cooled to form a brass casting.

In one embodiment, cooling the mold in which the molten iron is injected may be cooling for about 1 hour to about 6 hours in a temperature range of about 150° C. to about 250° C. If it is carried out in a temperature range of less than about 150 °C, cracks may occur, and when carried out in a temperature range exceeding about 250 °C, cooling may take an excessively long time.

In one embodiment, the shape of the brass casting formed by cooling after injection into the mold may be an inverted cone shape. For example, the brass casting may have an inverted cone shape and/or a funnel shape in which the coffee outlet is formed on the lower surface by expanding toward the upper end, opening the upper part, and shrinking toward the lower end. That is, by injecting water into the open upper part and bringing it into contact with the coffee, the coffee extracted through the coffee outlet formed in the lower part may be discharged.

In one embodiment, the inside of the brass casting to be formed may be characterized in that a step is formed horizontally. The conventional coffee dripper has a step that extends radially along the inner wall surface, so that the taste and aroma of coffee cannot be consistently extracted. Accordingly, the coffee dripper according to the present invention can extract the maximum taste and aroma of coffee by increasing the time for water to contact the coffee by forming a horizontal step therein.

In one embodiment, after the step of forming the brass casting, the step of engraving a letter on the outer surface of the formed brass casting may be further included. By engraving letters on the outside of the formed brass casting, it is possible to maximize the aesthetic effect. The method of engraving the letters may be performed without limitation, and for example, may be performed by one or more methods selected from the group consisting of a laser, an engraving machine, a marking machine, and combinations thereof.

In one embodiment, after the step of forming the brass casting, it may further comprise the step of polishing the surface of the formed brass casting. By grinding the surface of the formed brass casting, it is possible to sharpen the rough surface and remove the oxide film or scratches to induce a unique color of brass. For example, the polishing step may be performed in various ways as long as the surface of the brass casting can be polished, for example, it may be polished using a grinder, a grinder, a sander, or a grinder.

Next, the obtained brass casting is immersed in the ceramic coating composition.

In one embodiment, the ceramic coating composition, ceramic powder; silicone binder; and an organic solvent. For example, the ceramic powder may include at least one selected from the group consisting of aluminum oxide, silicon carbide, aluminum nitride, cermet, zirconia, yttria stabilized zirconia, mullite, quartz, and combinations thereof, Specifically, yttria-stabilized zirconia and aluminum nitride may be included in an amount of about 10 to about 30% by weight, respectively, based on the coating composition.

The yttria-stabilized zirconia (YSZ) is a ceramic material made to be stable even at room temperature by adding yttrium oxide (yttria) to zirconium oxide (zirconia). It does not break easily and the hot water does not cool easily, so you can extract the best coffee taste.

In one embodiment, the yttria-stabilized zirconia may be included in an amount of about 10 to about 30% by weight based on the total weight of the ceramic coating composition. If the yttria-stabilized zirconia is included in an amount of less than about 10% by weight, the effect of improving thermal conductivity may not be sufficiently exhibited, and if it exceeds about 30% by weight, the manufacturing cost may be excessively improved.

In addition, the aluminum nitride is a ceramic material represented by the chemical formula of AlN, and is characterized by high heat resistance, corrosion resistance, and thermal conductivity. The aluminum zalphide has low mechanical strength compared to other ceramics, but in order to compensate for this, by mixing yttria-stabilized zirconia together, a brass coffee dripper having high thermal conductivity, heat resistance, and corrosion resistance while having excellent mechanical strength can be manufactured.

In one embodiment, the aluminum nitride may be included in an amount of about 10 to about 30 wt% based on the total weight of the ceramic coating composition. If the aluminum nitride is included in less than about 10% by weight, the effect of improving heat resistance, corrosion resistance, and thermal conductivity may not be sufficiently exhibited, and if it exceeds about 30% by weight, mechanical strength may decrease.

In one embodiment, the silicone binder is added to improve bonding strength and viscosity between components of the ceramic coating composition, for example, phenyl silicone fluid, hydrogen silicone fluid, alkyl aryl silicone fluid, fluoro silicone It may include one or more selected from the group consisting of a fluid, an EO/PO silicone fluid, a hydroxy silicone fluid, an amino silicone fluid, an epoxy silicone fluid, a phenol silicone fluid, a mercapto silicone fluid, and combinations thereof. Specifically, the silicone binder may include an epoxy silicone fluid.

In one embodiment, the silicone binder may be included in an amount of about 10 to about 20 wt% based on the total weight of the ceramic coating composition. If the silicone binder is included in an amount of less than about 10% by weight, the bonding strength between the components may decrease so that the ceramic coating composition may not be easily coated on the brass casting, and if it exceeds about 20% by weight, the viscosity is excessively improved This may impair workability.

In one embodiment, the organic solvent is included to dissolve the components so that the brass casting can be easily immersed, for example, glycols, ethers, glycol ethers, acetates, alcohols, And it may include one or more selected from the group consisting of combinations thereof. Specifically, the organic solvent may contain propylene glycol in an amount of about 20 to about 70 wt% based on the total weight of the ceramic coating composition.

In one embodiment, the ceramic coating composition may further include a water repellent derived from nature. The natural water repellent refers to a material having water repellency and waterproof performance that can be easily obtained from nature, and the ceramic coating composition further includes a water repellent derived from nature to exhibit a water repellency effect, thereby exhibiting high storability even in a humid environment. can For example, the naturally-derived water repellent may include one selected from the group consisting of palm oil, olive oil, castor oil, peanut oil, lard, brisket, tallow, and combinations thereof, specifically, including castor oil may be doing

In one embodiment, the naturally-derived water repellent may be included in an amount of about 0.1 to about 5% by weight based on the total weight of the ceramic coating composition. If the naturally-derived water repellent is included in less than about 0.1% by weight, the water repellent effect may not be sufficiently exhibited, and when it is included in excess of about 5% by weight, miscibility with other components may be inhibited.

In an embodiment, the ceramic coating composition may further include titanium oxide porcelain. The titanium oxide porcelain means that titanium dioxide is mixed with water, molded, and then heated to a temperature of about 1,250° C. to about 1,350° C. and sintered. The titanium oxide porcelain exhibits high tensile strength and tear strength, so that when included in the ceramic coating composition, high mechanical strength is imparted to the prepared brass coffee dripper to exhibit high durability and chemical resistance for a long period of time.

In one embodiment, the titanium oxide porcelain may be included in an amount of about 0.01 to about 3 wt% based on the total weight of the ceramic coating composition. If the titanium oxide porcelain is included in an amount of less than about 0.01 wt %, the effect of improving mechanical strength may not be sufficiently exhibited, and when included in an amount exceeding about 3 wt %, miscibility with other components may be inhibited.

In one embodiment, the ceramic coating composition may further include an alkali metal naphthalenide-based compound. The alkali metal naphthalenide-based compound is intended to improve the tensile strength and chemical resistance of the brass casting coated with the ceramic coating composition. and chemical resistance. For example, the alkali metal naphthalenide-based compound may include sodium naphthalenide, lithium naphthalenide, or potassium naphthalenide. .

In one embodiment, the alkali metal naphthalenide-based compound may be included in an amount of about 0.01 to about 3% by weight based on the total weight of the ceramic coating composition, and if the alkali metal naphthalenide-based compound is about When included in less than 0.01% by weight, the effect of improving mechanical strength may not be sufficiently exhibited, and when included in excess of about 3% by weight, miscibility with other components may be inhibited.

In one embodiment, the temperature of the ceramic coating composition may be in the range of about 25 ℃ to about 35 ℃. If the temperature of the coating composition is less than about 25 ℃, the viscosity of the coating composition may increase and workability may decrease, and if it exceeds about 35 ℃, it may be cured too quickly to form a thick coating layer.

In one embodiment, the immersion time in the ceramic coating composition may be performed for about 1 second to about 30 seconds. If the immersion time is less than about 1 second, the coating layer may not be uniformly formed, and if it exceeds about 30 seconds, workability may decrease.

Next, the brass casting immersed in the ceramic coating composition is dried to obtain a brass coffee dripper having a ceramic coating layer formed thereon. For example, the drying may be performed by room temperature drying, hot air drying, or freeze drying, and specifically, the ceramic coating composition is cured by drying at 180° C. to 280° C. for about 10 minutes to about 60 minutes to cure the ceramic coating layer. may be to form

In one embodiment, the formation of the ceramic coating layer by drying after immersion in the ceramic coating composition may be repeatedly performed. By repeating the step of drying after immersion in the ceramic coating composition, it is possible to further improve the mechanical strength of the prepared brass coffee dripper.

In one embodiment, the immersion and drying step may be repeatedly performed twice, and when repeatedly performed, the final drying step may be performed at a lower temperature than the previous drying step. For example, when the immersion and drying are repeatedly performed twice, the first drying is performed at 250° C. for about 10 minutes to about 60 minutes, and the second drying is a water bath containing cold water of about 5° C. to 10° C. It may be carried out for about 1 hour to about 12 hours. Accordingly, the thin ceramic coating layer is formed in two layers to provide the effect of further improving the mechanical strength.

In one embodiment, the brass coffee dripper manufactured by the above-described method may be supplied through packaging and inspection, and in order to give a unique color to the brass coffee dripper during the supply, the step of applying a pigment composition, etc. It may be further included, but is not limited thereto.

Hereinafter, the configuration of the present invention and its effects will be described in more detail through specific examples and comparative examples. However, these examples are for explaining the present invention in more detail, and the scope of the present invention is not limited to these examples.

[Examples 1 to 3]

78% by weight of copper and 22% by weight of tin are put into a heater and heated at a temperature of 1,000°C to 1,200°C for 8 hours to melt to form molten iron, pour the molten iron into a predetermined molding machine and cool it at 200°C for 6 hours, the upper end It expanded toward the side, the upper part was opened, and it was reduced toward the lower part side to form an inverted cone-shaped brass casting in which the coffee outlet was formed on the lower surface. After grinding the surface of the formed brass casting using a sanding machine (SandBlast#100/4kgf/cm2), it was immersed in a ceramic coating composition at 25°C consisting of the components shown in Table 1 below for 10 seconds and then at 250°C for 20 minutes. dried while Next, after being immersed in the same ceramic coating composition for 30 seconds, it was dried in a water bath containing cold water at 5° C. for 6 hours to obtain a brass coffee dripper having a double ceramic coating layer. According to the components of the ceramic coating composition, the prepared brass coffee drippers were named Examples 1 to 3, respectively.

Ceramic coating composition composition (wt%) Example 1 Example 2 Example 3 Yttria Stabilized Zirconia 15.00 15.00 15.00 aluminum nitride 15.00 15.00 15.00 Epoxy Silicone Fluid 20.00 20.00 20.00 propylene glycol 50.00 45.00 45.00 castor oil - 2.50 2.25 titanium oxide porcelain - 2.00 2.25 lithium naphthalenide - - 0.50 Sum 100.00 100.00 100.00

[Comparative Example 1]

A coffee dripper made of glass having the same shape as in Example was prepared, and this was named Comparative Example 1.

[Comparative Example 2]

78% by weight of copper and 22% by weight of tin are put into a heater, heated at a temperature range of 1,000°C to 1,200°C for 8 hours to melt to form molten iron, pour the molten iron into a predetermined molding machine and cool at 200°C for 6 hours, the upper end It expanded toward the side, the upper part was opened, and it was reduced toward the lower part side to form an inverted cone-shaped brass casting in which the coffee outlet is formed on the lower surface. A brass coffee dripper of Comparative Example 2 was obtained by grinding the surface of the formed brass casting using a sander.

[Experimental Example 1: Non-volatile content test]

For each of the ceramic coating compositions of Examples 1 to 3, the nonvolatile content was tested in accordance with KSM-5000-2113. The test was performed at (250° C.×20 minutes)%, and the test results are shown in Table 2 below.

division Non-volatile content test result (%) Example 1 45.9 Example 2 30.5 Example 3 26.4

As shown in Table 2, the ceramic coating composition according to the present invention exhibited a reduced non-volatile content test result toward Examples 2 and 3.

[Experimental Example 2: Viscosity test]

For each of the ceramic coating compositions of Examples 1 to 3, the viscosity was measured according to KSM-5000. The test was conducted at 25 °C, and the test results are shown in Table 3 below.

division Viscosity test result (sec) Example 1 12.2 Example 2 13.5 Example 3 15.4

As shown in Table 3, the ceramic coating composition according to the present invention exhibited a viscosity that improved toward Examples 2 and 3.

[Experimental Example 3: Test of specific gravity]

For each of the ceramic coating compositions of Examples 1 to 3, specific gravity was measured according to KSM-5000-2131. The test was carried out at 25 °C, and the test results are shown in Table 4 below.

division Specific Gravity Test Results Example 1 1.1 Example 2 1.2 Example 3 1.1

As shown in Table 4, it was confirmed that the ceramic coating compositions of Examples 1 to 3 exhibited similar specific gravity values.

[Experimental Example 4: Heat resistance test]

For each of the coffee drippers prepared in Examples and Comparative Examples, a heat resistance test was performed. The test was performed at 300°C for 3 hours, with no damage to the product as a grade of 5, grades 5, 4, 3, 2, 1, and a score of 0 when more than 65% damage was taken. evaluated. The test results are shown in Table 5 below.

division Heat resistance test result Example 1 Grade 5 (No abnormality) Example 2 Grade 5 (No abnormality) Example 3 Grade 5 (No abnormality) Comparative Example 1 0 rating Comparative Example 2 2nd grade

As shown in Table 5, it was confirmed that the coffee dripper prepared by the method according to the present invention had improved heat resistance compared to the coffee dripper of Comparative Example.

[Experimental Example 5: Boiling Water Resistance Test]

For each of the coffee drippers prepared in Examples and Comparative Examples, a boiling water resistance test was performed. The test was performed by immersion at 98°C for 3 hours, with no damage to the product as grade 5, grade 5, grade 4, grade 3, grade 2, grade 1, and grade 0 when more than 65% damage was evaluated as The test results are shown in Table 6 below.

division boiling water test result Example 1 Grade 5 (No abnormality) Example 2 Grade 5 (No abnormality) Example 3 Grade 5 (No abnormality) Comparative Example 1 0 rating Comparative Example 2 4th grade

As shown in Table 6, it was confirmed that the coffee dripper prepared by the method according to the present invention had improved boiling water resistance compared to the coffee dripper of Comparative Example.

[Experimental Example 6: Pencil hardness test]

For each of the coffee drippers prepared in Examples and Comparative Examples, pencil hardness was tested according to the MIT-UNIT PENCIL method. The test results are shown in Table 7 below.

division Pencil hardness test result Example 1 5H (No abnormality) Example 2 5H (No abnormality) Example 3 5H (No abnormality) Comparative Example 1 3H Comparative Example 2 4H

As shown in Table 7, it was found that the coffee dripper prepared by the method according to the present invention had improved hardness compared to the coffee dripper of the comparative example.

[Experimental Example 7: Adhesion Test]

For each of the coffee drippers prepared in Examples and Comparative Examples, adhesion was tested using 3M Tape. In the evaluation method, the case where there is no peeling or damage to the product is graded as 5, and the case of 5 grades, 4 grades, 3 grades, 2 grades, 1 grades, and 65% or more peeling or damaged is graded O. did The evaluation results are shown in Table 8 below.

division Adhesion test result Example 1 Grade 5 (No abnormality) Example 2 Grade 5 (No abnormality) Example 3 Grade 5 (No abnormality) Comparative Example 1 3rd grade Comparative Example 2 4th grade

As shown in Table 8, it was confirmed that the coffee dripper prepared by the method according to the present invention had higher adhesion than the coffee dripper of Comparative Example.

[Experimental Example 8: Saltiness Test]

의 5% NaCl 용액에 24 시간 침적한 뒤 마모 또는 손상된 부분이 있는지를 평가하였다. 테스트 결과는 이상이 전혀 없는 경우를 10 점으로 하고, 마모 또는 손상된 부분의 정도에 따라 0 점까지 표기하였다. 테스트 결과는 하기 표 9에 나타내었다.For each of the coffee drippers prepared in the above Examples and Comparative Examples, 25

After immersion in a 5% NaCl solution for 24 hours, it was evaluated whether there was abrasion or damage. As for the test result, the case where there was no abnormality was scored as 10 points, and 0 points were indicated depending on the degree of wear or damage. The test results are shown in Table 9 below.

division saline test results Example 1 9 Example 2 10 Example 3 10 Comparative Example 1 5 Comparative Example 2 7

As shown in Table 9, it was confirmed that the coffee dripper prepared by the method according to the present invention had improved saltiness compared to the coffee dripper of Comparative Example.

[Experimental Example 9: Solvent Abrasion Test]

For each of the coffee drippers prepared in Examples and Comparative Examples, solvent abrasion was tested by the BTX series. The test was performed in a method of 100 times of abrasion under MEK, IPA, and 1 kg load, and it was evaluated whether there was abrasion or damage. As for the test result, the case where there was no abnormality was scored as 10 points, and 0 points were indicated depending on the degree of wear or damage. The test results are shown in Table 10 below.

division Solvent Abrasion Test Results Example 1 8 Example 2 10 Example 3 10 Comparative Example 1 2 Comparative Example 2 4

As shown in Table 10, it was confirmed that the coffee dripper prepared by the method according to the present invention exhibited superior solvent abrasion results compared to the coffee dripper of Comparative Example.

[Experimental Example 10: Non-toxicity test]

For each of the coffee drippers prepared in Examples and Comparative Examples, non-toxicity tests were performed for endocrine barrier substances such as arsenic, lead, hexavalent chromium, cadmium, and phenol. The test results are shown in Table 11 below.

division Non-toxic test result Example 1 not detected Example 2 not detected Example 3 not detected Comparative Example 1 not detected Comparative Example 2 not detected

As shown in Table 11 above, it was confirmed that the coffee dripper prepared by the method according to the present invention exhibits non-toxicity against endocrine system obstruction.

[Experimental Example 11: Measurement of mechanical properties]

The mechanical properties of each coffee dripper prepared in Examples and Comparative Examples were measured. Measurement items were flexural strength, compressive strength, and tensile strength, and were measured according to KS F 4042-02 standard. The measurement results are shown in Table 12 below.

division flexural strength
(N/mm ² ) compressive strength
(N/mm ² ) The tensile strength
(N/mm ² ) Example 1 18.6 48.0 11.4 Example 2 21.3 52.9 13.7 Example 3 24.6 61.4 16.2 Comparative Example 1 10.2 28.6 7.8 Comparative Example 2 12.6 39.4 9.2

As shown in Table 12, the coffee dripper prepared by the method according to the present invention exhibited significantly improved values in terms of flexural strength, compressive strength, and tensile strength performance compared to Comparative Example.

In this specification, only a few examples among the various embodiments performed by the present inventors will be described, but the technical spirit of the present invention is not limited or limited thereto, and it is of course that it may be modified and implemented in various ways by those skilled in the art.

Claims (3)

Preparing molten iron by heating 60 to 80% by weight of copper and 20 to 40% by weight of tin at a temperature range of 1,000°C to 1,400°C for 1 hour to 12 hours;
Inverted cone-shaped brass casting in which the molten molten iron is poured into the mold, the mold in which the molten metal is injected is cooled, the mold is expanded toward the upper end, the upper part is opened, and the coffee outlet is formed on the lower surface by shrinking toward the lower part. forming a;
grinding the surface of the formed brass casting using a grinder, a grinder, a sander, or a grinder;
immersing the polished brass casting in the ceramic coating composition at a temperature range of 25° C. to 35° C. for 1 second to 30 seconds; and
Drying the brass casting immersed in the ceramic coating composition at a temperature range of 180° C. to 280° C. for 10 minutes to 60 minutes to cure the ceramic coating composition to obtain a brass coffee dripper having a ceramic coating layer;
As a method of manufacturing a brass coffee dripper comprising a,
The ceramic coating composition,
Yttria stabilized zirconia 10 to 30% by weight, aluminum nitride 10 to 30% by weight, epoxy silicone fluid 10 to 20% by weight, propylene glycol 20 to 70% by weight, castor oil 0.1 to 5% by weight, and titanium oxide porcelain 0.01 to 3 characterized in that it contains % by weight,
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