KR20250043833A - Method and apparatus for anti-glare coating - Google Patents

Abstract

An anti-glare coating device according to one embodiment of the present disclosure includes a storage unit for storing a coating liquid, a pipe unit for transporting the coating liquid stored in the storage unit, a pump unit for transporting the coating liquid stored in the storage unit through the pipe unit, a nozzle unit connected to one end of the pipe unit for spraying the transported coating liquid, a sensor unit connected to the nozzle unit for measuring a pressure acting on the coating liquid located in the nozzle unit, an analysis unit for analyzing the particle size of the sprayed coating liquid, and a control unit for receiving measurement results from the sensor unit and the analysis unit and controlling the pump unit.

Description

{Method and apparatus for anti-glare coating}

The present disclosure relates to a coating method and device, and more particularly, to a method and device for anti-glare (AG) coating.

When the display is exposed to light, the light incident on the display surface is reflected, reducing the contrast, and the readability is reduced due to the image reflection. In addition, the glare of the screen can make it difficult to recognize characters, which can increase eye fatigue. Coating the surface of the substrate to prevent glare due to light reflection is called anti-glare coating. Anti-glare coating can prevent glare by inducing diffuse reflection of light on the surface of the substrate.

These anti-glare coatings can be used in a variety of fields, including cover glass for mobile phones, computer monitors, electronic boards, billboards, electronic whiteboards, glass whiteboards, navigation systems, black boxes, cameras, and cover glass for solar panels.

One of the anti-glare coating methods is the spray coating method. The spray coating method is a method of forming a surface with low reflectivity by spraying a coating liquid onto the surface of a substrate. The quality of the coating surface in the spray method depends on the particle size of the coating liquid sprayed from the nozzle. The smaller the particle size, the more uniformly the coating surface is formed by fine particles. Therefore, efforts have been made to atomize the particles during coating. Accordingly, the inner diameter of the nozzle has been reduced, but as the inner diameter of the nozzle is reduced, the nozzle becomes clogged more frequently and the nozzle performance is not uniformly secured, which may deteriorate the coating quality.

In addition, as the size of the pipe decreases while the size of the nozzle decreases, a pulsation phenomenon occurs accordingly. To solve this problem, an ultrasonic nozzle or pulsation controller can be additionally installed, but this causes an increase in equipment costs.

Korean Patent Publication No. 10-2017-0086618 (Title of the invention: Anti-glare touch screen display and other coating products and their forming method, Publication date: 2017.07.26)

The present disclosure relates to the aforementioned background technology and aims at improving the quality of spray coating for anti-glare.

The present disclosure aims to refine the particle size of a spray coating for anti-glare.

However, the problems to be solved in the present disclosure are not limited to the problems mentioned above, and other problems not mentioned can be clearly understood based on the description below.

According to one embodiment of the present disclosure for achieving the above-described task, an anti-glare coating device includes a storage unit for storing a coating liquid, a pipe unit for transporting the coating liquid stored in the storage unit, a pump unit for transporting the coating liquid stored in the storage unit through the pipe unit, a nozzle unit connected to one end of the pipe unit for spraying the transported coating liquid, a sensor unit connected to the nozzle unit for measuring a pressure acting on the coating liquid located in the nozzle unit, an analysis unit for analyzing the particle size of the sprayed coating liquid, and a control unit for receiving measurement results from the sensor unit and the analysis unit and controlling the pump unit.

Alternatively, one end of the pipe section may include a first pipe made of a polytetra fluoroethylene (PTFE) material, and the first pipe may be characterized by having an inside diameter of 0.3 mm or less.

Alternatively, the control unit can determine whether a pulsation phenomenon has occurred based on the pressure measurement results measured from the sensor unit and the particle analysis results measured from the analysis unit.

Alternatively, the control unit may be characterized by controlling the pump unit based on the pressure measurement result measured from the sensor unit and the particle analysis result measured from the analysis unit.

Alternatively, one end of the pipe section may further include a second pipe made of a polytetra fluoroethylene (PTFE) material, the inner diameter of the second pipe is 1 mm or less, the first pipe and the second pipe are interconnected, and one end of the first pipe and the nozzle section may be connected.

Alternatively, the first pipe length may be characterized as being at least 150 mm.

Alternatively, the device may further include a curing unit for drying the sprayed coating liquid, and the curing unit may further include a heat drying unit for drying the sprayed coating liquid with hot air, and a UV drying unit for drying the sprayed coating liquid with ultraviolet rays.

Alternatively, the device comprises a cleaning unit for cleaning one surface of the substrate on which the coating liquid is to be sprayed;

The washing unit may further include a plasma treatment unit for performing plasma treatment on a surface washed in the washing unit.

An anti-glare coating method using an anti-glare coating device according to one embodiment of the present disclosure includes an operation of washing one side of a substrate based on ultrasonic waves, an operation of treating one side with plasma, an operation of spraying a coating solution on the plasma-treated side, an operation of drying the side on which the coating solution is sprayed with hot air, and an operation of drying the side on which the coating solution is sprayed with ultraviolet rays.

Alternatively, the operation of washing one side of the substrate is characterized by washing at a temperature of 35 degrees Celsius to 45 degrees Celsius, based on ultrasonic waves having a frequency of 28 kHz to 50 kHz.

Alternatively, the action of drying one side with hot air is characterized by drying at 55 degrees Celsius to 65 degrees Celsius for at least 4 minutes.

The quality of an anti-glare coating can be improved by atomizing coating liquid particles through the present disclosure.

In addition, the present disclosure can facilitate management and response to clogging phenomena that mainly occur in nozzles with small inner diameters.

In addition, the present disclosure can reduce the occurrence of pulsation phenomenon during coating and make it easier to deal with the occurrence of pulsation phenomenon.

FIG. 1 illustrates an anti-glare coating device according to one embodiment of the present disclosure.
Figure 2 illustrates a coating portion according to one embodiment of the present disclosure.
FIG. 3 shows the connection state of one end of a pipe section and a nozzle section according to one embodiment of the present disclosure.
FIG. 4 illustrates an anti-glare coating method according to one embodiment of the present disclosure.
FIG. 5 illustrates a method for drying an anti-glare coating according to one embodiment of the present disclosure.
FIG. 6 illustrates a control method of a control unit of an anti-glare coating device according to one embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present disclosure. The embodiments presented in the present disclosure are provided so that those skilled in the art can utilize or implement the contents of the present disclosure. Accordingly, various modifications to the embodiments of the present disclosure will be apparent to those skilled in the art. That is, the present disclosure may be implemented in various different forms and is not limited to the embodiments below.

Throughout the specification of the present disclosure, the same or similar drawing reference numerals refer to the same or similar components. In addition, in order to clearly describe the present disclosure, drawing reference numerals of parts that are not related to the description of the present disclosure may be omitted in the drawings.

The term "or" as used herein is intended to mean an inclusive "or" rather than an exclusive "or." That is, unless otherwise specified herein or the context makes clear, "X employs either A or B" should be understood to mean either one of the natural inclusive permutations. For example, unless otherwise specified herein or the context makes clear, "X employs A or B" can be interpreted to mean either X employs A, X employs B, or X employs both A and B.

The term "and/or" as used herein should be understood to refer to and include all possible combinations of one or more of the relevant concepts listed.

The terms "comprises" and/or "comprising" as used herein should be understood to mean the presence of particular features and/or components. However, it should be understood that the terms "comprises" and/or "comprising" do not exclude the presence or addition of one or more other features, other components, and/or combinations thereof.

Unless otherwise specified in this disclosure or unless the context makes it clear that the singular form is intended to be referred to, the singular should generally be construed to include “one or more.”

The term "Nth (N is a natural number)" used in the present disclosure can be understood as an expression used to mutually distinguish components of the present disclosure according to a predetermined standard such as a functional viewpoint, a structural viewpoint, or convenience of explanation. For example, components performing different functional roles in the present disclosure can be distinguished as a first component or a second component. However, components that are substantially the same within the technical spirit of the present disclosure but should be distinguished for convenience of explanation may also be distinguished as a first component or a second component.

The explanation of the terms set forth above is intended to aid in understanding the present disclosure. Therefore, if the terms set forth above are not explicitly stated as matters limiting the contents of the present disclosure, it should be noted that they are not used to limit the technical ideas of the contents of the present disclosure.

FIG. 1 illustrates an anti-glare coating device (1000) according to one embodiment of the present disclosure.

Referring to FIG. 1, an anti-glare coating device (1000) may include a cleaning unit (1100), a plasma treatment unit (1200), a coating unit (1300), a lighting unit (1400), an optical property inspection unit (1500), and/or a curing unit (1600).

The cleaning unit (1100) can clean one side of the substrate on which the coating liquid is to be sprayed. The cleaning unit (1100) can perform a cleaning operation using ultrasonic waves, and at this time, the frequency of the ultrasonic waves is 28 kHz to 50 kHz. In addition, the cleaning unit (1100) can perform a cleaning operation using a liquid cleaning solution at a temperature of 35 degrees Celsius to 45 degrees Celsius. Preferably, the cleaning unit (1100) can perform a cleaning operation at 40 degrees Celsius for at least 4 minutes. The frequency of the ultrasonic waves, the cleaning temperature, and the type of the liquid cleaning solution can be appropriately changed and applied by a person having ordinary knowledge in the technical field of the present disclosure (hereinafter, referred to as 'those skilled in the art').

The plasma treatment unit (1200) can plasma-treat one side of a substrate cleaned in the cleaning unit (1100). The plasma treatment can be performed for an appropriate amount of time depending on the strength of the plasma, and the surface of one side of the plasma-treated substrate can be modified to facilitate deposition of a coating liquid, thereby improving the quality of the anti-glare coating.

The coating unit (1300) can perform an anti-glare coating by spraying a coating solution onto one surface of a plasma-treated substrate. The components of the coating unit (1300) are described in detail later in FIG. 2.

The lighting unit (1400) includes a light capable of emitting light to the coating surface on which the coating liquid is applied. The lighting unit (1400) may include a three-wavelength fluorescent lamp, a sodium lamp, a halogen lamp, or an LED lamp. The lighting unit (1400) may enable defects such as foreign substances, bubbles, and pinholes on the coating surface to be easily identified with the naked eye, or may increase the judgment accuracy of the model when an image recognition-based defect detection artificial intelligence model is used.

The anti-glare coating device (1000) may further include a coating surface inspection device (not shown) together with the lighting unit (1400). The coating surface inspection device may include a camera capable of photographing a coating surface illuminated by light, a memory storing an artificial intelligence model capable of analyzing an image photographed from the camera, and a processor that determines an image of the coating surface photographed from the camera based on the artificial intelligence model. The artificial intelligence model learns image data of a defective coating surface based on machine learning or deep learning, and can determine whether there is a defect in the images of the coating surface photographed from the camera.

The optical characteristic inspection unit (1500) inspects the optical characteristics of the coating surface. The optical characteristics represent the characteristics of light and may include haze (diffusivity), transmittance, turbidity, cloudiness, etc. The optical characteristic inspection unit (1500) can measure optical characteristics of the coating surface, such as haze and transmittance, and the quality level of the coating surface can be determined based on the measured values. For example, the haze value or transmittance value of the coating surface can be compared with a numerical range, which is an acceptable standard, to determine whether the quality of the coating surface is good or bad.

The curing unit (1600) can perform an operation of drying the coating liquid applied to the coating surface. The curing unit (1600) can include a heat drying unit (1610) and a UV drying unit (1620). The heat drying unit (1610) dries the coating surface using hot air, and the UV drying unit (1620) dries the coating surface using ultraviolet rays. The heat drying unit (1610) can dry the coating surface at 50 to 70 degrees Celsius for at least 4 minutes. The drying temperature and time can be appropriately changed and applied by those skilled in the art.

FIG. 2 illustrates a coating portion (1300) according to one embodiment of the present disclosure.

Referring to FIG. 2, the coating unit (1300) may include a storage unit (1310), a pipe unit (1320), a pump unit (1330), a nozzle unit (1340), a sensor unit (1350), an analysis unit (1360), and/or a control unit (1370).

The storage unit (1310) may be configured as a storage container for storing a coating liquid, and elements such as the shape, shape, and size of the storage unit (1310) may be appropriately selected by a person skilled in the art.

The pipe section (1320) may be configured as a pipe for transporting the coating liquid stored in the storage section (1310). The pipe section (1320) provides a path for transporting the coating liquid from the storage section (1310) to the nozzle section (1340).

The pump unit (1330) can provide power so that the coating liquid stored in the storage unit (1310) can be transferred to the nozzle unit (1340). The pump unit (1330) can be composed of at least one pump, and the specifications of the pump can be appropriately selected by a person skilled in the art in consideration of the fluid dynamic characteristics of the coating liquid.

The nozzle part (1340) is connected to one end (1322) of the pipe part (1320) and can spray the coating liquid delivered through the pipe part (1320) onto one surface (20) of the substrate. The nozzle part (1340) can be connected to an air compressor, and at this time, the delivered coating liquid can be sprayed together with compressed air from the nozzle part (1340) to be sprayed as fine particles.

The sensor unit (1350) is connected to the nozzle unit (1340) and can measure the pressure applied to the coating liquid in the nozzle unit (1340). That is, the sensor unit (1350) can include a pressure sensor.

The analysis unit (1360) can analyze the particle size of the sprayed coating liquid. The analysis unit (1360) can be a particle size analysis device that can analyze the particle size of the sprayed coating liquid based on an image captured by a camera.

The control unit (1370) can receive pressure information measured from the sensor unit (1350) and the particle size analysis results of the sprayed coating liquid from the analysis unit (1360). The control unit (1370) can receive measured data from the sensor unit (1350) or the analysis unit (1360) and determine whether a pulsation phenomenon occurs based on the measured data. In addition, the control unit (1370) can control the operation of the pump unit (1330) based on data measured in real time from the sensor unit (1350) or the analysis unit (1360).

FIG. 3 shows a connection state (cross-section) of one end of a pipe section and a nozzle section according to one embodiment of the present disclosure.

Referring to FIG. 3, one end (1322, 1324) of the pipe section (1320) is connected to the nozzle section (1340). The one end (1322, 1324) of the pipe section (1320) may include a first pipe (1324) and a second pipe. At this time, the first pipe (1324) is made of a polytetra fluoro ethylene (PTFE) material, the inner diameter of the first pipe (1324) is 0.3 mm (b) or less, and the length of the first pipe (1324) may be at least 150 mm or more. The first pipe (1324) may be directly connected to the nozzle section (1340).

The second pipe is made of polytetra fluoro ethylene (PTFE) material, and the inner diameter of the second pipe is 1 mm (a) or less. The first pipe (1324) and the second pipe (1324) can be connected through a mutual connection port (1326).

Based on the connection structure as shown in FIG. 3, the coating part according to one embodiment of the present disclosure can reduce the pulsation phenomenon, and can easily maintain the equipment by replacing the first pipe when the nozzle is clogged. When replacing the size of the nozzle, the outer diameter of the first pipe can be changed to match the inner diameter of the nozzle, but the inner diameter of the first pipe can be maintained at 0.3 mm or less as before. The particle size can be varied from 3 um to 89 um by replacing the nozzle.

Fig. 4 illustrates an anti-glare coating method according to one embodiment of the present disclosure. The anti-glare coating method can be performed by the anti-glare coating device described in Fig. 1.

Referring to FIG. 4, the anti-glare coating method may include an operation of washing one side of a substrate (410), an operation of plasma treating one side of the substrate (420), an operation of spray coating the plasma-treated side (430), an operation of inspecting the coated side (440), and/or an operation of drying the coated side (450).

In one embodiment, operation 410 represents an operation of cleaning a surface to be coated. Operation 410 may be performed in the cleaning unit (1100) of FIG. 1. Operation 410 may clean a surface using ultrasonic waves. At this time, the frequency of the ultrasonic waves is 28 kHz to 50 kHz. In addition, operation 410 may clean using a liquid cleaning solution at a temperature of 35 degrees Celsius to 45 degrees Celsius. Preferably, the cleaning operation may be continued for at least 4 minutes at 40 degrees Celsius.

Operation 420 represents an operation of plasma-treating a washed surface. Operation 420 can be performed by the plasma treatment unit (1200) of Fig. 1. The plasma treatment can be performed for an appropriate time depending on the strength of the plasma, and one side of the plasma-treated substrate can have its surface modified to facilitate deposition of a coating liquid, thereby improving the quality of the anti-glare coating.

Operation 430 represents an operation of spray coating a surface that has been subjected to plasma treatment. Operation 430 can be performed by the coating unit (1300) of Fig. 1. In operation 430, a coating liquid that is atomized and sprayed through a nozzle is applied to the surface that has been subjected to plasma treatment. In operation 430, a first pipe directly connected to the nozzle is made of a polytetra fluoro ethylene (PTFE) material, and an inner diameter of the first pipe is 0.3 mm (b) or less and a length of at least 150 mm or more. In addition, a second pipe connected to the first pipe is made of a polytetra fluoro ethylene (PTFE) material, and an inner diameter may be 1 mm or less.

The operation 440 represents an operation for inspecting a coating surface. The operation 440 can be performed by the lighting unit (1400) or the optical characteristic inspection unit (1500) of Fig. 1. The operation 440 can detect defects such as foreign substances, bubbles, and pinholes formed on the coating surface by using light radiated to the coating surface. At this time, the light radiated to the coating surface includes light generated by a three-wavelength fluorescent lamp, a sodium lamp, a halogen lamp, or an LED lamp. In addition, the operation 440 can calculate characteristic values such as haze, transmittance, turbidity, or cloudiness of the coating surface through the optical characteristic inspection. Therefore, whether the quality of the coating product is defective can be determined based on the values measured through the optical characteristic inspection.

The 450 operation dries the coating surface. The 450 operation can be performed by the hardening unit (1600) of Fig. 1.

Fig. 5 illustrates a drying method of an anti-glare coating according to one embodiment of the present disclosure. The drying method can be performed by the curing unit (1600) of Fig. 1.

Referring to FIG. 5, a method for drying an anti-glare coating may include an operation (510) of drying a coating surface with hot air and an operation (520) of drying the coating surface using UV.

In one embodiment, operation 510 may be performed by the thermal drying unit (1610) of FIG. 1. Operation 520 may be performed by the UV drying unit (1620) of FIG. 1.

The 510 operation can dry the coating surface using hot air at a temperature of 50 to 70 degrees Celsius for at least 4 minutes. The drying temperature and time can be appropriately changed and applied by those skilled in the art.

The 520 action can dry the coating surface by irradiating it with UV.

Fig. 6 illustrates a control method of a control unit of an anti-glare coating device according to one embodiment of the present disclosure. The control method can be performed by the control unit (1370) of Fig. 2.

Referring to FIG. 6, the control unit (1370) can determine whether the pressure measurement value is within an acceptable range based on the pressure measurement value received from the sensor unit (1350) (610). If the pressure measurement value is not within the acceptable range, the control unit (1370) can determine whether the particle analysis result measured from the analysis unit (1360) is within the acceptable range (620). If the particle analysis result is not within the acceptable range, the control unit (1370) can change the operation of the pump unit (1330) or display an alarm. That is, the control unit (1370) can control the pump based on the coating liquid spray pressure and particle analysis result measured in real time, thereby maintaining the quality of the coating at a constant level.

If the pressure measurement value is within the acceptable range or the particle analysis result is within the acceptable range, the control unit (1370) does not change the operation of the pump and maintains the current state.

The anti-glare coating device and method described in the present disclosure can reduce the influence of pulsation phenomenon that may occur in spray coating, improve the convenience of nozzle maintenance, and thereby improve coating quality and increase production yield.

The various embodiments of the present disclosure described above can be combined with additional embodiments and can be modified within a range that can be understood by those skilled in the art in light of the detailed description set forth above. It should be understood that the embodiments of the present disclosure are illustrative in all respects and not restrictive. For example, each component described as a single component may be implemented in a distributed manner, and likewise, components described as distributed may be implemented in a combined manner. Accordingly, all changes or modifications derived from the meaning, scope, and equivalent concept of the claims of the present disclosure should be interpreted as being included in the scope of the present disclosure.

Claims (11)

As an anti-glare coating device,
A storage unit for storing the coating liquid;
A piping section through which the coating liquid stored in the storage section is transported;
A pump unit that transports the coating liquid stored in the storage unit through the pipe unit;
A nozzle section connected to one end of the above pipe section and spraying the transported coating liquid;
A sensor unit connected to the nozzle unit and measuring the pressure applied to the coating liquid located in the nozzle unit;
An analysis unit for analyzing the particle size of the sprayed coating liquid; and
A control unit that receives measurement results from the sensor unit and the analysis unit and controls the pump unit,
device.
In paragraph 1,
One end of the above pipe section includes a first pipe made of polytetra fluoroethylene (PTFE) material, and the inner diameter of the first pipe is 0.3 mm or less.
device.
In the second paragraph,
The above control unit,
Based on the pressure measurement result measured from the sensor unit and the particle analysis result measured from the analysis unit, it is characterized in that it determines whether a pulsation phenomenon occurs.
device.
In the third paragraph,
The above control unit,
A method characterized in that the pump unit is controlled based on the pressure measurement results measured from the sensor unit and the particle analysis results measured from the analysis unit.
device.
In the second paragraph,
The above one end of the above pipe section further includes a second pipe made of polytetra fluoro ethylene (PTFE) material, and the inner diameter of the second pipe is 1 mm or less.
The first pipe and the second pipe are interconnected, and one end of the first pipe and the nozzle section are connected,
device.
In paragraph 5,
The length of the first pipe is characterized by being at least 150 mm or more.
device.
In paragraph 1,
Further comprising a curing unit for drying the sprayed coating liquid,
The above hardening part is,
Including a thermal drying unit that dries the sprayed coating liquid with hot air, and a UV drying unit that dries the sprayed coating liquid with ultraviolet rays.
device.
In paragraph 1,
The above device,
A cleaning unit for cleaning one surface of a substrate on which the coating liquid is to be sprayed; and
Further comprising a plasma treatment unit for performing plasma treatment on the surface washed in the above cleaning unit.
device.
In the anti-glare coating method using the anti-glare coating device of Article 8,
An operation for cleaning one side of a substrate based on ultrasonic waves;
An operation of plasma treating the above surface;
An action of spraying a coating liquid onto the surface treated with plasma;
The operation of drying the surface on which the coating liquid is sprayed with hot air, and
Including an operation of drying the surface on which the coating liquid is sprayed using ultraviolet rays.
method.
In Article 9,
The action of washing one side of the above description is:
Based on ultrasound with a frequency of 28 kHz to 50 kHz, washing at a temperature of 35 to 45 degrees Celsius.
method.
In Article 10,
The action of drying the above surface with hot air is
Dry at 55 to 65 degrees Celsius for at least 4 minutes.
method.