KR20230031748A - Cooking appliance exterior material and manufacturing method thereof - Google Patents

Abstract

Disclosed in the present specification are a cooking appliance exterior material having improved visibility, Vickers hardness, and scratch resistance by forming a laser hole on the surface of the exterior material including a diamond like carbon (DLC) coating layer, and a manufacturing method thereof. The cooking appliance exterior material according to an embodiment of the present invention comprises: a base material; a DLC coating layer which is provided on top of the substrate; an adhesive layer which is provided between the base material and the DLC coating layer, to improve adhesion between the base material and the DLC coating layer; and a plurality of laser holes which are provided on the surface of the cooking appliance exterior material.

Description

Cooking appliance exterior and its manufacturing method {COOKING APPLIANCE EXTERIOR MATERIAL AND MANUFACTURING METHOD THEREOF}

The present invention relates to a cooking appliance exterior material and a manufacturing method thereof, and more particularly, to a cooking appliance exterior material having improved visibility by forming a laser hole on the surface and a manufacturing method thereof.

A cooking appliance collectively refers to a cooking machine and cooking utensils, and is an appliance for cooking, reheating, or cooling food or the like through a heat source such as gas, electricity, or steam. Representative cooking appliances include induction, ovens, gas ranges, microwaves, and the like.

Exterior materials of these cooking appliances require a certain level of durability to protect them from external shocks. However, when an exterior material including a coating layer is used to improve durability, a problem in that cyanity is deteriorated occurs.

On the other hand, recent cooking appliances are produced including flat display devices such as LCDs and LEDs for easy operation and luxurious appearance. In the case of a cooking appliance including a flat panel display, it is difficult to use an exterior material with poor visibility.

Therefore, there is an urgent need to introduce a cooking appliance exterior material that improves visibility and at the same time satisfies a certain level of durability.

An object of the present invention to solve the above problems is to provide a cooking appliance exterior material with improved visibility, Vickers hardness and scratch resistance by forming a laser hole on the surface of the exterior material including a DLC coating layer, and a manufacturing method thereof. .

A cooking appliance exterior material according to an embodiment of the present invention includes a substrate; A diamond like carbon (DLC) coating layer provided on top of the substrate; an adhesive layer provided between the substrate and the DLC coating layer to improve adhesion between the substrate and the DLC coating layer; And it may include a plurality of laser holes provided on the surface.

In addition, in the cooking appliance exterior material according to an embodiment of the present invention, the substrate may include ceramic glass.

In addition, in the cooking appliance exterior material according to an embodiment of the present invention, the substrate may have a thickness of 3 to 6 mm.

In addition, in the cooking appliance exterior material according to an embodiment of the present invention, the DLC coating layer may have a Vickers hardness of 800 to 1500 Hv.

In addition, in the cooking appliance exterior material according to an embodiment of the present invention, the DLC coating layer may have a vertical force of 15 to 20 N at which scratches occur.

In addition, in the cooking appliance exterior material according to an embodiment of the present invention, the DLC coating layer may have a thickness of 1 to 3 μm.

In addition, in the cooking appliance exterior material according to an embodiment of the present invention, the adhesive layer may include at least one or more of Si, SiO _x and R ₃ SiO _x .

In addition, in the cooking appliance exterior material according to an embodiment of the present invention, the adhesive layer may include trimethoxysilane (TMS).

In addition, in the cooking appliance exterior material according to an embodiment of the present invention, the adhesive layer may have a thickness of 0.1 to 1.0 μm.

In addition, in the cooking appliance exterior material according to an embodiment of the present invention, the laser hole may have a radius of 0.01 to 0.9 μm.

In addition, in the cooking appliance exterior material according to an embodiment of the present invention, the laser hole may have a depth of 1.5 to 4.0 μm.

In addition, in the cooking appliance exterior material according to an embodiment of the present invention, the plurality of laser holes may have an interval of 0.01 to 0.9 μm.

In addition, the cooking appliance exterior material according to an embodiment of the present invention may have a transmittance of 1 to 10%.

In addition, the cooking appliance exterior material according to an embodiment of the present invention can visually recognize a flat panel display device.

In addition, a method of manufacturing an exterior material for a cooking appliance according to an embodiment of the present invention includes preparing a substrate; Etching the surface of the substrate; Forming an adhesive layer on top of the etched substrate; Forming a DLC coating layer on top of the adhesive layer; and forming a plurality of laser holes on the surface.

In addition, in the method of manufacturing an exterior material for a cooking appliance according to an embodiment of the present invention, the etching may be performed through a linear ion source (LIS) process.

In addition, in the manufacturing method of the cooking appliance exterior material according to an embodiment of the present invention, at least one of the steps of forming the adhesive layer and the step of forming the DLC coating layer may be performed by a PVD (Physical Vapor Deposition) method.

In addition, in the method for manufacturing an exterior material for a cooking appliance according to an embodiment of the present invention, the PVD method may include a LIS (Linear Ion Source) method.

In addition, a cooking appliance according to an embodiment of the present invention includes a cooking appliance main body; and an exterior material provided outside the cooking appliance body, wherein the exterior material includes: a substrate; A diamond like carbon (DLC) coating layer provided on top of the substrate; an adhesive layer provided between the substrate and the DLC coating layer to improve adhesion between the substrate and the DLC coating layer; And it may include a plurality of laser holes provided on the surface.

In addition, in the cooking appliance according to an embodiment of the present invention, the exterior material may have a transmittance of 1 to 10%.

According to one embodiment of the present invention, by forming a laser hole on the surface of the exterior material including the DLC coating layer, it is possible to provide a cooker exterior material with improved visibility, Vickers hardness and scratch resistance, and a manufacturing method thereof.

However, the effects that can be achieved by the cooking appliance exterior material according to the embodiment of the present invention are not limited to those mentioned above, and other effects not mentioned are common knowledge in the art to which the present invention belongs from the description below. will be clearly understandable to those who have

1 is a schematic view of an exterior material for a cooking appliance according to an embodiment of the present invention.
2 is a schematic view of a method for manufacturing an exterior material for a cooking appliance according to an embodiment of the present invention.
3 is a photograph for confirming the transmittance of Comparative Example.
4 is a photograph for confirming transmittance of an exterior material for a cooking appliance according to an embodiment of the present invention.
5 is a photograph taken through a digital microscope of a surface of an exterior material for a cooking appliance according to an embodiment of the present invention.
6 is a photograph showing scratch generation behavior of an embodiment according to a variable load scratch experiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are presented to sufficiently convey the spirit of the present invention to those skilled in the art. The present invention may be embodied in other forms without being limited to only the embodiments presented herein. In the drawings, in order to clarify the present invention, illustration of parts irrelevant to the description may be omitted, and the size of components may be slightly exaggerated to aid understanding.

Throughout the specification, when a certain component is said to "include", it means that it may further include other components without excluding other components unless otherwise stated.

Expressions in the singular number include plural expressions unless the context clearly dictates otherwise.

A cooking appliance exterior material according to an embodiment of the present invention includes a substrate; A diamond like carbon (DLC) coating layer provided on top of the substrate; an adhesive layer provided between the substrate and the DLC coating layer to improve adhesion between the substrate and the DLC coating layer; And it may include a plurality of laser holes provided on the surface.

1 is a schematic view of an exterior material for a cooking appliance according to an embodiment of the present invention.

Referring to FIG. 1 , a substrate may be provided at the lowermost end of the exterior material, and a DLC coating layer may be formed on the substrate. Accordingly, the DLC coating layer may be the outermost surface of the cooking appliance exterior material. In addition, an adhesive layer for improving adhesion between the substrate and the DLC coating layer may be formed between the substrate and the DLC coating layer. Also, a plurality of laser holes may be formed on the surface of the exterior material.

The substrate may include tempered glass such as ceramic glass so as not to be easily damaged. However, the material of the substrate is not limited thereto.

In addition, the substrate may have a thickness of 3 to 6 mm. When the thickness of the substrate is thin, durability may be deteriorated. However, when the thickness of the substrate is thick, raw material costs may increase. Considering this, the substrate may have a thickness of 3 to 6 mm, preferably 4 to 6 mm. However, the thickness of the substrate is not limited thereto.

The cooking appliance exterior material according to an embodiment of the present invention may improve durability by forming the DLC coating layer. The Vickers hardness of the DLC coating layer may be 800 to 1500 Hv.

In addition, the cooking appliance exterior material according to an embodiment of the present invention may improve scratch resistance by forming the DLC coating layer.

Scratch resistance evaluation can be performed through a variable load scratch test. The variable load scratch test may be performed based on ASTM D7027, C1326, C1327 or C1624 scratch test standards.

When a variable load scratch experiment is performed on the exterior material of the cooking appliance according to an embodiment of the present invention, the DLC coating layer may have a vertical force of 15 to 20 N at which scratches occur. As for the vertical force at which scratches occur, the vertical force at the time point at which scratches are visually recognized was measured. The time point at which scratches were visually recognized was evaluated based on the time point at which the brightness difference between the scratch generating part and the background of the exterior material of the cooking appliance was 3% or more.

In addition, the DLC coating layer may have a thickness of 1 to 3 μm. When the thickness of the DLC coating layer is thin, Vickers hardness and heat resistance may be inferior. In consideration of this, the thickness of the DLC coating layer may be 1 μm or more. However, when the thickness of the DLC coating layer is too thick, visibility may be deteriorated and production cost may increase. Considering this, the thickness of the DLC coating layer may be 3 μm or less. Preferably, the thickness of the DLC coating layer may be 1.5 to 2.5 μm. However, the thickness of the DLC coating layer is not limited thereto.

The adhesive layer for improving adhesion between the substrate and the DLC coating layer may include at least one of Si, SiO _x and R ₃ SiO _x . In addition, the adhesive layer may include trimethoxysilane (TMS).

The adhesive layer is formed to improve adhesion between the substrate and the DLC coating layer. The adhesive layer may be formed to include at least one of Si, SiO _x and R ₃ SiO _x , and may include trimethoxysilane (TMS). Si means silicon, SiO _x means silicon oxide in general, and R ₃ SiO _x means silicon oxide including a side chain. Since the adhesive layer includes Si, peeling between the substrate and the DLC coating layer may be prevented and adhesive strength may be increased.

In addition, the adhesive layer may have a thickness of 0.1 to 1 μm. When the thickness of the adhesive layer is thin, the adhesive strength between the substrate and the DLC coating layer may deteriorate. In consideration of this, the adhesive layer may have a thickness of 0.1 μm or more. However, when the thickness of the adhesive layer is too thick, visibility may be deteriorated and production cost may increase. In consideration of this, the thickness of the adhesive layer may be 1 μm or less. Preferably, the adhesive layer may have a thickness of 0.2 to 0.6 μm. However, the thickness of the adhesive layer is not limited thereto.

An exterior material for a cooking appliance according to an embodiment of the present invention may include a plurality of laser holes provided on a surface.

A plurality of laser holes provided on the surface of the exterior material of the cooking appliance is a key component capable of improving the visibility of the exterior material. The plurality of laser holes may be prepared through a fiber laser dimple forming device. The radius of the laser hole may be controlled by adjusting the width of the laser emitted from the fiber laser dimple forming device. In addition, the depth of the laser hole may be controlled by adjusting the power of the fiber laser dimple forming device. In addition, the distance between the plurality of laser holes may be controlled by adjusting the moving speed of the laser ejection device in the fiber laser dimple forming apparatus.

The laser hole may have a radius of 0.01 to 0.9 μm, preferably 0.01 to 0.3 μm. In addition, the laser hole may have a depth of 1.5 to 4.0 μm. In addition, the plurality of laser holes may have an interval of 0.01 to 0.9 μm, preferably 0.05 to 0.3 μm.

If the radius and depth of the laser hole and the distance between the plurality of laser holes are too short, the effect of improving visibility obtained by forming the laser hole may deteriorate. However, if the radius and depth of the laser hole and the distance between the plurality of laser holes are too long, Vickers hardness and scratch resistance may be deteriorated and cleanability may be deteriorated.

Meanwhile, the plurality of laser holes may be formed only on the DLC coating layer or even on the DLC coating layer and the adhesive layer.

In addition, the plurality of laser holes may appear in a circular shape when the distance between the plurality of laser holes is long, and may appear in a square shape when the distance between the plurality of laser holes is short. However, the shape of the plurality of laser holes is not limited.

5 is a photograph taken through an optical microscope of a surface of an exterior material for a cooking appliance according to an embodiment of the present invention.

Referring to FIG. 5 , a laser hole formed on a surface of an exterior material for a cooking appliance according to an embodiment of the present invention can be confirmed.

By providing the plurality of laser holes on the surface of the cooking appliance exterior material, the cooking appliance exterior material according to an embodiment of the present invention may have a transmittance of 1 to 10%.

3 is a photograph for confirming the transmittance of Comparative Example, and FIG. 4 is a photograph for confirming the transmittance of the cooking appliance exterior material according to an embodiment of the present invention. 3 and 4, in the comparative example, the 7-segment of the flat panel display is hardly visible due to poor transmittance. segment was clearly visible. That is, by forming a plurality of laser holes on the surface of the exterior material of the cooking appliance, it can be seen that the visibility is improved and the flat panel display inside appears more clearly.

Meanwhile, in the cooking appliance exterior material according to an embodiment of the present invention, a flat panel display device installed in the cooking appliance can be visually recognized. The flat panel display device may be an LCD or LED.

Next, a method for manufacturing an exterior material for a cooking appliance according to another aspect of the present invention will be described.

A method of manufacturing an exterior material for a cooking appliance according to an embodiment of the present invention includes preparing a substrate; Etching the surface of the substrate; Forming an adhesive layer on top of the etched substrate; Forming a DLC coating layer on top of the adhesive layer; and forming a plurality of laser holes on the surface.

2 is a schematic view of a method for manufacturing an exterior material for a cooking appliance according to an embodiment of the present invention.

Referring to FIG. 2, in the cooking appliance exterior material according to an embodiment of the present invention, a substrate is loaded on a substrate, the substrate is etched, an adhesive layer is formed, a DLC coating layer is formed, and after unloading, cooking It can be manufactured through a series of processes of forming laser holes on the surface of the device exterior material.

First, the substrate may be loaded onto a substrate.

Next, etching is performed on the surface of the substrate. Etching is to clean and activate the surface of the substrate before forming the coating layer. The etching step may be performed through a Linear Ion Source (LIS) process to be described later. That is, it may be performed by spraying an ion gun on the surface of the substrate.

As a kind of PVD (Physical Vapor Deposition) method, a linear ion source (LIS) step of spraying an ion beam onto a substrate may be performed. LIS can progress in about 120 minutes or less. LIS may be performed by injecting Ar (argon) into a chamber at 10 to 50 sccm (standard cubic centimeters per minute: cm ³ /min) and applying a voltage of 1800 ± 500V to the substrate. Through the LIS method, the adhesion of the coating layer to the substrate can be improved. In addition, at least one or more of the adhesive layer and the DLC coating layer may be formed by the LIS method.

Specifically, a voltage of 1800 ± 500 V may be applied to the ion gun to spray the substrate. The PVD method has the advantage of excellent mass production, and the LIS method can produce products with improved quality.

Next, a step of forming an adhesive layer on top of the substrate may be performed. The adhesive layer may be formed to include at least one of Si, SiO _x and R ₃ SiO _x , and may include trimethoxysilane (TMS). Forming the adhesive layer may be performed within about 200 minutes.

The adhesive layer may be formed to improve adhesion between the substrate and the DLC coating layer. The adhesive layer may be formed through vacuum deposition, in which TMS is heated and evaporated, and then a metal is brought into close contact with a thin film using steam. That is, the adhesive layer may be formed on the upper portion of the substrate on which etching is performed using an evaporator.

After that, a step of forming a DLC coating layer on the adhesive layer may be performed. DLC coating according to an embodiment of the present invention may use ion deposition. Ion deposition is a method of forming a film by ionizing hydrocarbon-based gas by plasma discharge and accelerating collision with a substrate. Specifically, a DCL coating layer may be coated on the adhesive layer by spraying an ion gun on the substrate. As the hydrocarbon-based gas, acetylene (C ₂ H ₂ ), methane (CH ₄ ), and benzene (C ₆ H ₆ ) may be used. However, it is not limited thereto. Forming the DLC coating layer may be performed within 500 minutes.

Next, a plurality of laser holes may be formed on the surface of the exterior material of the cooking appliance. The plurality of laser holes may be prepared through a fiber laser dimple forming device. A laser may be emitted from a laser ejection device in the fiber laser dimple forming device, and a laser hole may be formed on a surface of an exterior material of the cooking appliance while moving the laser ejection device at a constant speed. As described above, the radius and depth of the laser hole and the distance between the plurality of laser holes may be controlled by adjusting the width of the laser to be emitted, the power of the fiber laser dimple forming device, and the transport speed of the laser ejection device.

Next, a cooking appliance according to another aspect of the present invention will be described.

A cooking appliance according to an embodiment of the present invention includes a main body of the cooking appliance; and an exterior material provided outside the cooking appliance body, wherein the exterior material includes: a substrate; A diamond like carbon (DLC) coating layer provided on top of the substrate; an adhesive layer provided between the substrate and the DLC coating layer to improve adhesion between the substrate and the DLC coating layer; And it may include a plurality of laser holes provided on the surface.

A description of the exterior material of the cooking appliance is as described above.

Various parts constituting the cooking appliance may be installed in the main body of the cooking appliance. Also, a user interface may be provided that receives a control command from a user and displays operation information of the cooking appliance to the user. A flat panel display may be included in the user interface, and an LCD or LED may be used.

By providing the plurality of laser holes on the surface of the cooking appliance exterior material, the cooking appliance exterior material according to an embodiment of the present invention may have a transmittance of 1 to 10%. Therefore, by using the exterior material of the cooking appliance with improved visibility, the user can more clearly recognize the operating state of the cooking appliance.

Hereinafter, the present invention will be described in more detail through examples. However, the description of these examples is only for exemplifying the practice of the present invention, and the present invention is not limited by the description of these examples. This is because the scope of the present invention is determined by the matters described in the claims and the matters reasonably inferred therefrom.

{Example}

After preparing a cooker exterior specimen of about 600 * 520 mm having a laser hole shown in Table 1 below, transmittance, Vickers hardness, variable load scratch test and clean water scrubber test were performed.

division Laser hole (μm) radius depth interval Example 1 0.05 3.0 0.3 Example 2 0.08 3.0 0.1 Example 3 0.1 3.0 0.12 Example 4 0.2 3.0 0.2 Example 5 0.3 3.0 0.2 Comparative Example 1 0.005 3.0 0.2 Comparative Example 2 1.0 3.0 0.2 Comparative Example 3 0.3 1.4 0.2 Comparative Example 4 0.3 4.5 0.2 Comparative Example 5 0.3 3.0 0.005 Comparative Example 6 0.3 3.0 1.0

The results of transmittance, Vickers hardness, variable load scratch test and fresh water scrubber test are shown in Table 2 below.

The transmittance was measured by exposing light in the visible ray region to the surface of the exterior material of the cooking appliance. The ratio of the incident luminous flux transmitted to the luminous flux of the main light incident on the exterior of the cooking appliance was measured using a spectrophotometer.

The Vickers hardness was obtained by measuring the diagonal of the pyramid-shaped concave portion formed in the specimen by pressing the specimen using a pyramidal incorporator having a diamond quadrangular pyramid to obtain the hardness.

The variable load scratch experiment was performed by applying a vertical force to the specimen through a diamond indenter (Rockwell C cone) and observing the scratch behavior occurring on the specimen surface. At this time, the vertical force applied to the specimen was constantly increased from 0.5 N to 20 N, and the scratch behavior was observed through an optical or electron microscope while moving the specimen at a speed of 240 mm/s.

As for the vertical force at which scratches occur, the vertical force at the time point at which scratches are visually recognized was measured. The time point at which scratches were visually recognized was evaluated based on the time point at which the difference in brightness between the scratch generating part and the background of the exterior material of the cooking appliance was 3%.

The freshwater semi-scratch experiment was conducted by measuring the distribution of scratches generated when rubbing 100 times with a constant force of 3 kgf. The fresh scrubber scratch experiment is meaningful in that it is performed with a relatively large force than the variable load scratch experiment, and the condition is more similar to the actual use environment of the cooking appliance. On the other hand, in Table 2 below, the occurrence distribution of scratches having grooves of 1 μm is shown.

division transmittance
(%) Vickers hardness
(Hv) variable load
scratch experiment
(N) clean scrubber
scratch experiment
(pcs/20mm ² ) Example 1 One 950 18 10 Example 2 3 980 15 13 Example 3 2 1050 18 12 Example 4 3 1005 20 13 Example 5 5 980 18 15 Comparative Example 1 0.3 950 20 13 Comparative Example 2 One 720 12 50 Comparative Example 3 0.5 970 18 15 Comparative Example 4 2 680 10 67 Comparative Example 5 0.5 990 18 17 Comparative Example 6 1.5 700 12 55

Referring to Table 2, since Examples 1 to 5 satisfy all of the radius, depth, and spacing of the laser hole proposed in the present invention, the transmittance is 1 to 10%, the Vickers hardness is 800 to 1500 Hv, and the vertical force that causes scratches is 15 to 20 N were satisfied. That is, it can be evaluated that both cyanability and durability are excellent.

However, in Comparative Examples 1, 3 and 5, the radius, depth and spacing of the laser holes were short, and the transmittance was inferior.

In addition, Comparative Examples 2, 4, and 6 had a long radius, depth, and spacing of laser holes, and the Vickers hardness and scratch test results were all inferior. That is, it can be evaluated that durability is inferior.

Claims (20)

write;
A diamond like carbon (DLC) coating layer provided on top of the substrate;
an adhesive layer provided between the substrate and the DLC coating layer to improve adhesion between the substrate and the DLC coating layer; and
A cooking appliance exterior including a plurality of laser holes provided on a surface thereof. The method of claim 1,
The substrate is a cooking appliance exterior material comprising ceramic glass. The method of claim 1,
The substrate is a cooking appliance exterior material having a thickness of 3 to 6 mm. The method of claim 1,
The DLC coating layer has a Vickers hardness of 800 to 1500 Hv, a cooking appliance exterior material. The method of claim 1,
The DLC coating layer has a vertical force at which scratches occur in a range of 15 to 20 N. The method of claim 1,
The DLC coating layer has a thickness of 1 to 3 μm, a cooking appliance exterior material. The method of claim 1,
Wherein the adhesive layer includes at least one or more of Si, SiO _x and R ₃ SiO _x . The method of claim 1,
Wherein the adhesive layer includes trimethoxysilane (TMS). The method of claim 1,
The adhesive layer is a cooking appliance exterior material having a thickness of 0.1 to 1.0 μm. The method of claim 1,
The laser hole has a radius of 0.01 to 0.9 μm, a cooking appliance exterior material. The method of claim 1,
The laser hole has a depth of 1.5 to 4.0 μm, a cooking appliance exterior material. The method of claim 1,
Wherein the plurality of laser holes have an interval of 0.01 to 0.9 μm. The method of claim 1,
A cooking appliance exterior material having a transmittance of 1 to 10%. The method of claim 1,
A cooking appliance exterior material that visually recognizes a flat panel display device. Preparing a substrate;
Etching the surface of the substrate;
Forming an adhesive layer on top of the etched substrate;
Forming a DLC coating layer on top of the adhesive layer; and
A method of manufacturing a cooking appliance exterior comprising the step of forming a plurality of laser holes on a surface. The method of claim 15
The etching step is performed through a LIS (Linear Ion Source) process, a method of manufacturing a cooking appliance exterior material. The method of claim 15
At least one of the step of forming the adhesive layer and the step of forming the DLC coating layer is performed by a PVD (Physical Vapor Deposition) method. The method of claim 16
The PVD method includes a LIS (Linear Ion Source) method, a method of manufacturing a cooking appliance exterior material. Cooking appliance body; and
Including an exterior material provided on the outside of the cooking appliance body,
The exterior material is
write;
A diamond like carbon (DLC) coating layer provided on top of the substrate;
an adhesive layer provided between the substrate and the DLC coating layer to improve adhesion between the substrate and the DLC coating layer; and
A cooking appliance comprising a plurality of laser holes provided on a surface thereof. The method of claim 19
The exterior material has a transmittance of 1 to 10%, the cooking appliance.

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