KR20220107701A - Manufacturing method of low reflection intensified glass - Google Patents

Abstract

The present invention relates to a method for manufacturing low reflection intensified glass. More specifically, the present invention relates to a method for manufacturing low reflection glass which comprises the following steps of: (S400) primary printing on the surface of glass; (S500) drying the primary printed glass in a firing furnace; (S600) secondary printing on the surface of the dried glass; and (S700) enhancing the secondary printed glass by adding heat at a higher temperature than drying temperature of the firing furnace, so that the durability is significantly improved and the high transmittance is maintained, and, at the same time, an effect of preventing the user's glare is excellent.

Description

Manufacturing method of low-reflection tempered glass {MANUFACTURING METHOD OF LOW REFLECTION INTENSIFIED GLASS}

The present invention relates to a method of manufacturing low-reflection tempered glass, and specifically, durability and rigidity such as chemical resistance are remarkably improved, high transmittance is maintained, and at the same time low reflectance, which is excellent in preventing user's glare. It relates to a manufacturing method.

In the past, the desk top plate was generally manufactured using materials such as wood or plastic, but in recent years, glass material is used as the desk top plate due to the advantages of easy maintenance and management and excellent appearance.

On the other hand, the desk top plate made of a glass material as described above has a problem in that reflected light that causes glare to users such as students is generated.

In order to lower the reflected light of such a glass material desk top plate, Patent Document 1 discloses a method of manufacturing a low-reflection tempered glass school desk comprising the step of transforming into an opaque glass plate by etching one surface of a transparent glass plate with hydrogen fluoride. is starting.

However, in the manufacturing method of Patent Document 1, there was a problem in that the durability of the manufactured desk glass was lowered by putting the opaque glass plate treated with hydrogen fluoride in a heat treatment furnace and immediately heating it to a temperature of 600° C. or higher, and one side of the glass plate By transforming the surface into an opaque glass plate, there was a problem in that the color or shape of the printed pattern printed on the corresponding surface was completely transmitted to the opposite side of the upper surface and could not be seen.

Therefore, in the process of lowering the reflectivity, the durability of the glass is not reduced, and the color or shape of the printed layer printed on one side is completely transmitted to the opposite side. is in demand.

Patent Document 1: Korean Patent Registration No. 10-2150123 (2020.08.31)

It is an object of the present invention to provide a method of manufacturing a low-reflection glass having an excellent effect of preventing glare of the user by having a low reflectance while remarkably improving durability and maintaining a high transmittance.

A method of manufacturing a low-reflection tempered glass according to an embodiment of the present invention comprises the steps of primary printing on the surface of the glass (S400); Drying the first printed glass in a firing furnace (S500); Secondary printing on the surface of the dried glass (S600); and strengthening the secondary printed glass by applying heat at a temperature higher than the drying temperature of the kiln (S700).

In the manufacturing method of low-reflection tempered glass according to an embodiment of the present invention, the step (S500) is characterized in that it is performed at a temperature of 100 to 130 ℃.

In the manufacturing method of low-reflection tempered glass according to an embodiment of the present invention, the step (S700) is characterized in that it is performed at a temperature of 650 to 750 ℃.

In the method for manufacturing low-reflection tempered glass according to an embodiment of the present invention, the step (S100) or (S300) is characterized in that it is performed using a heat-resistant lead-free ceramic ink.

The manufacturing method of low-reflection tempered glass according to the present invention exhibits an excellent effect of preventing glare from users by remarkably improving durability and rigidity such as chemical resistance and maintaining high transmittance and low reflectivity.

1 is a diagram showing a schematic process diagram of a method for manufacturing a low-reflection tempered glass according to the present invention.
2 is a photograph showing a glass product for a desk manufactured by the manufacturing method of low-reflection tempered glass according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein.

Hereinafter, with reference to the accompanying drawings, it will be described in detail with respect to the manufacturing method of the low-reflection tempered glass according to the present invention.

1 is a diagram showing a schematic process diagram of a method for manufacturing a low-reflection tempered glass according to the present invention, and FIG. 2 is a photograph showing a glass product for a desk manufactured by the manufacturing method of a low-reflection tempered glass according to the present invention.

The present invention relates to a method of manufacturing low-reflection glass, and more particularly, to a method of manufacturing low-reflection glass having excellent durability and maintaining high transmittance and at the same time having low reflectivity to prevent glare from users.

A method of manufacturing a low-reflection tempered glass according to an embodiment of the present invention comprises the steps of primary printing on the surface of the glass (S400); Drying the first printed glass in a firing furnace (S500); Secondary printing on the surface of the dried glass (S600); and strengthening the secondary printed glass by applying heat at a temperature higher than the drying temperature of the kiln (S700).

That is, in the method for manufacturing low-reflection tempered glass according to the present invention, it is put in a relatively low temperature kiln in a state of primary printing (undercoating) on the surface of the glass, dried, and then secondary printed on the primary printed layer again. (topcoat printing) is performed, and it is characterized in that it includes the step of placing the glass plate on which the secondary printing is performed in a relatively high temperature kiln and strengthening it.

That is, in the prior art, tempered glass was manufactured by performing primary printing on the surface of the glass plate and then immediately putting it in a high-temperature kiln to strengthen the glass. In this case, there is a problem in that the transmittance and rigidity of the glass are lowered, and at the same time, the degree of light reflection of the finally manufactured glass is severe, so that there is a limitation in using it as a glass top plate for a desk.

Accordingly, the present inventor increases the transmittance of the glass plate manufactured during the manufacture of a glass plate that can be used as a desk top plate, etc., so that a pattern such as a picture or letter printed on the lower surface of the glass plate is completely transmitted to the upper surface of the glass plate, and at the same time, the manufactured By remarkably improving the rigidity and durability of the glass plate, and also remarkably lowering the degree of light reflection on the upper surface, a new method of manufacturing a tempered glass plate that can dramatically prevent glare from users such as students when using it as a glass plate for a desk top have been developed

That is, the present inventors first print on the surface of the glass (S400); Drying the first printed glass in a firing furnace (S500); Secondary printing on the surface of the dried glass (S600); and strengthening the secondary printed glass by applying heat at a temperature higher than the drying temperature of the kiln (S700); It was found that it is possible to significantly reduce the light reflection on the upper surface of the glass plate while increasing the durability and rigidity of the glass.

More specifically, the method for manufacturing tempered glass according to the present invention comprises the steps of cutting the original glass to a predetermined size (S100); grinding and processing each surface of the glass cut to a predetermined size (S200); removing foreign substances from the glass surface of which each side is polished (S300); First printing on the surface of the washed glass (S400); drying the first printed glass in a kiln having a temperature of 130° C. or less (S500); Secondary printing on the surface of the dried glass (S600); strengthening the secondary printed glass by applying heat of 700° C. (S700); and washing the tempered glass by heating (S800); it is possible to include.

The step of cutting the original glass to a predetermined size (S100) is a process of uniformly cutting the large-sized original glass to a size and shape suitable for manufacturing a desk top, etc.

Such a glass cutting step (S100) can be performed in various sizes and shapes according to the characteristics of the final product to be manufactured using tempered glass.

On the other hand, when the glass cutting step is completed in this way, a step (S200) of grinding and processing each surface (cut surface) of the cut glass plate is performed.

Such a polishing step is typically performed using a polishing pad that can be used to polish the glass cut surface.

Next, a foreign material removal step (S300) of cleanly removing various foreign materials attached to the surface of the glass plate having the cut surface polished as described above is performed.

This step of removing foreign substances may be performed in a wet or dry manner.

That is, a method of using a wet cleaning process in which water or liquid cleaning liquid is sprayed onto the surface of the glass plate to wash dust or glass powder present on the surface of the glass plate, and a high-pressure spray gun is used to blow high-pressure air onto the surface of the glass plate. It is possible to perform the foreign material removal step (S300) by a method using a dry cleaning process of removing foreign substances present on the surface of the glass plate by spraying to the .

On the other hand, when the cleaning process of the surface of the glass plate is completed as described above, after wiping off the water or cleaning liquid, the undercoat printing process (S400) of primary printing on the lower surface of the glass plate is performed.

Such undercoat printing can be performed using a known transparent ink and printing ink in which elvan stone powder and mica powder are mixed.

On the other hand, when the primary printing is completed in this way, a process of tentatively drying the primary printing layer for about 10 minutes using a hot air of about 40 to 50 ℃ is performed.

Next, the glass plate having the pre-dried primary printed layer is put into a low-temperature kiln maintained at an internal temperature of about 100 to 130° C. and completely dried (S500) is performed.

When the primary printed layer is completely dried inside the low-temperature sintering furnace, the glass plate is taken out and cooled to room temperature, and then a second printing layer (top-coating layer) is formed on top of the primary printing layer (S600).

The secondary printing layer may be performed by using the printing ink used to form the primary printing layer, or by using a heat-resistant epoxy ink or a heat-resistant lead-free ceramic ink.

After the secondary printing layer is formed in this way, a process of pre-drying the secondary printing layer using hot air at about 40 to 50° C. for about 10 minutes is performed.

Next, a step (S700) of strengthening the glass plate having the pre-dried secondary printed layer in this way is put into a high-temperature kiln maintained at an internal temperature of about 650 to 750°C, preferably about 700°C, and the step (S700) is performed.

As such, when the strengthening process of the glass plate is completed, the glass plate is taken out from the high-temperature sintering furnace and cooled to room temperature, and then the step (S800) of wet or dry washing of foreign substances remaining on the surface of the glass plate is performed, thereby completing the manufacture of the tempered glass.

On the other hand, the tempered glass manufactured in this way can be subjected to an additional processing process into a final product suitable for various uses, such as a desk top.

Hereinafter, experiments for confirming the excellent effect of the manufacturing method of the present invention through various examples and comparative examples will be described.

[Example 1]

A plate glass having a thickness of 10 mm was cut into a rectangular shape having a size of 100 cm × 50 cm in width × length × 50 cm, and the cut surface was polished using a polishing pad. Thereafter, the cleaning liquid was sprayed to cleanly clean the surface of the cut and polished glass plate, and the cleaning liquid on the surface of the glass plate was completely removed. Next, a primary undercoat printing layer was formed with a thickness of about 0.5 mm by using a printing ink in which 1 kg of transparent ink, 100 g of elvan powder, and 100 g of mica powder were evenly mixed on the lower surface of the glass plate (a part of the glass plate for measuring transmittance does not form a printed layer). Next, a process of pre-drying the first printed layer for about 10 minutes was performed using a hot air blower that discharged hot air of about 40° C., and the glass plate was heated at an internal temperature of about 120° C. was placed in a low-temperature kiln where After complete drying of the first printed layer is completed, the glass plate is taken out of the low-temperature firing furnace, cooled naturally to room temperature, and then a second top coat is printed on the first undercoating layer using a transparent epoxy ink to a thickness of about 0.5 mm. A layer was formed (a printed layer was still not formed on the part of the glass plate for measuring transmittance). After that, a process of pre-drying the secondary printed layer for about 10 minutes was performed using a hot air blower that discharges hot air of about 40° C., and the glass plate was heated at an internal temperature of about 700° C. A process of strengthening the glass plate was performed for about 10 minutes by putting it in a high-temperature kiln where is maintained. After the strengthening process of the glass plate was completed, the glass plate was taken out of the high-temperature kiln and cooled naturally to room temperature, and foreign substances remaining on the surface of the glass plate cooled to room temperature were completely removed.

[Comparative Example 1] - Omitting the complete drying process of the low-temperature kiln

A plate glass having a thickness of 10 mm was cut into a rectangular shape having a size of 100 cm × 50 cm in width × length × 50 cm, and the cut surface was polished using a polishing pad. Thereafter, the cleaning liquid was sprayed to cleanly clean the surface of the cut and polished glass plate, and the cleaning liquid on the surface of the glass plate was completely removed. Next, a primary undercoat printing layer was formed with a thickness of about 0.5 mm by using a printing ink in which 1 kg of transparent ink, 100 g of elvan powder, and 100 g of mica powder were evenly mixed on the lower surface of the glass plate (a part of the glass plate for measuring transmittance does not form a printed layer). Next, a process of completely drying the first printed layer for about 1 hour was performed using a hot air blower that discharges hot air at about 40°C. After complete drying of the first printed layer was completed, it was naturally cooled to room temperature, and then a second top coat was formed with a thickness of about 0.5 mm using a transparent epoxy ink on the first undercoat printed layer (transmittance). still do not form a printed layer on said part of the glass plate for measurement). After that, a process of pre-drying the secondary printed layer for about 10 minutes was performed using a hot air blower that discharges hot air of about 40° C., and the glass plate was heated at an internal temperature of about 700° C. A process of strengthening the glass plate was performed for about 10 minutes by putting it in a high-temperature kiln where is maintained. After the strengthening process of the glass plate was completed, the glass plate was taken out of the high-temperature kiln and cooled naturally to room temperature, and foreign substances remaining on the surface of the glass plate cooled to room temperature were completely removed.

[Comparative Example 2] - Omit the strengthening step of the high-temperature kiln

A plate glass having a thickness of 10 mm was cut into a rectangular shape having a size of 100 cm × 50 cm in width × length × 50 cm, and the cut surface was polished using a polishing pad. Thereafter, the cleaning liquid was sprayed to cleanly clean the surface of the cut and polished glass plate, and the cleaning liquid on the surface of the glass plate was completely removed. Next, a primary undercoat printing layer was formed with a thickness of about 0.5 mm by using a printing ink in which 1 kg of transparent ink, 100 g of elvan powder, and 100 g of mica powder were evenly mixed on the lower surface of the glass plate (a part of the glass plate for measuring transmittance does not form a printed layer). Next, a process of pre-drying the first printed layer for about 10 minutes was performed using a hot air blower that discharged hot air of about 40° C., and the glass plate was heated at an internal temperature of about 120° C. was placed in a low-temperature kiln where After complete drying of the first printed layer is completed, the glass plate is taken out of the low-temperature firing furnace, cooled naturally to room temperature, and then a second top coat is printed on the first undercoating layer using a transparent epoxy ink to a thickness of about 0.5 mm. A layer was formed (a printed layer was still not formed on the part of the glass plate for measuring transmittance). After that, a process of completely drying the secondary printed layer for about 1 hour was performed using a hot air blower that discharges hot air at about 40° C., which was naturally cooled to room temperature, and applied to the surface of the glass plate cooled to room temperature. The remaining foreign matter was completely removed.

[Comparative Example 3] - After the high-temperature kiln strengthening step, the low-temperature kiln drying step was performed

A plate glass having a thickness of 10 mm was cut into a rectangular shape having a size of 100 cm × 50 cm in width × length × 50 cm, and the cut surface was polished using a polishing pad. Thereafter, the cleaning liquid was sprayed to cleanly clean the surface of the cut and polished glass plate, and the cleaning liquid on the surface of the glass plate was completely removed. Next, a primary undercoat printing layer was formed with a thickness of about 0.5 mm by using a printing ink in which 1 kg of transparent ink, 100 g of elvan powder, and 100 g of mica powder were evenly mixed on the lower surface of the glass plate (a part of the glass plate for measuring transmittance does not form a printed layer). Next, a process of pre-drying the first printed layer for about 10 minutes was performed using a hot air blower from which hot air of about 40° C. was discharged, and the glass plate was heated at an internal temperature of about 700° C. A process of strengthening the glass plate was performed for about 10 minutes by putting it in a high-temperature kiln where is maintained. After the strengthening process of the glass plate is completed, the glass plate is taken out of the high-temperature kiln, cooled naturally to room temperature, and then a second topcoat printed layer is formed with a thickness of about 0.5 mm on the first undercoat printed layer using a transparent epoxy ink. (The printed layer is still not formed on the part of the glass plate for measuring transmittance). Thereafter, a process of pre-drying the secondary printed layer for about 10 minutes was performed using a hot air blower that discharged hot air of about 40° C., and the glass plate was heated at an internal temperature of about 120° C. was placed in a low-temperature kiln where the After complete drying of the secondary printing layer was completed, the glass plate was taken out of the low-temperature firing furnace and cooled naturally to room temperature, and foreign substances remaining on the surface of the glass plate cooled to room temperature were completely removed.

[Experiment for measuring transmittance of tempered glass]

An experiment was performed for measuring the transmittance (%) of the glass plate using the tempered glass plates prepared in Example 1 and Comparative Examples 1 to 3, and the results are shown in Table 1 below. The transmittance of the glass plate was performed by transmitting light to the portion left as an unprinted layer on the glass plate, and then measuring the ratio (%) of the amount of light transmitted through the opposite side of the glass plate. The amount of applied light and the amount of transmitted light were measured in units of Lux, respectively.

division Transmittance (%) Example 1 98.5 Comparative Example 1 87.4 Comparative Example 2 85.3 Comparative Example 3 84.2

Looking at the results of Table 1, it can be seen that the glass plate manufactured by the method for manufacturing tempered glass according to the present invention exhibits very excellent light transmittance compared to Comparative Examples 1 to 3.

[Experiment for measuring the breaking strength of tempered glass]

An experiment for measuring the breaking strength of the glass plate was performed using the tempered glass plates prepared in Example 1 and Comparative Examples 1 to 3, and the results are shown in Table 2 below. The breaking strength of the glass plate was measured by measuring the drop height at which a crushing part of 10 mm or more is formed on the glass plate when a steel ball weighing 1 kg is vertically dropped on the glass plate.

division Glass plate breaking height (cm) Example 1 125 Comparative Example 1 92 Comparative Example 2 54 Comparative Example 3 95

Looking at the results of Table 2, it can be seen that the glass plate manufactured by the method for manufacturing tempered glass according to the present invention has very excellent breaking strength compared to Comparative Examples 1 to 3.

[Test of chemical resistance of tempered glass]

An experiment for measuring the durability of the glass plate was performed using the tempered glass plate prepared in Example 1 and Comparative Examples 1 to 3, and the results are shown in Tables 3 and 4 below. To measure the durability of the glass plate, the glass plate was completely immersed in an aqueous solution of sulfuric acid at a concentration of about 5 wt% and an aqueous solution of sodium chloride at a concentration of about 10 wt% for 100 hours. It was carried out by the method of measurement.

division Glass plate breaking height (cm) Example 1 112 Comparative Example 1 65 Comparative Example 2 32 Comparative Example 3 59

(After immersion in 5 wt% sulfuric acid aqueous solution for 100 hours)

division Glass plate breaking height (cm) Example 1 118 Comparative Example 1 66 Comparative Example 2 37 Comparative Example 3 62

(After immersion in 10wt% sodium chloride aqueous solution for 100 hours)

Looking at the results of Tables 3 and 4, it can be seen that the glass plate manufactured by the method for manufacturing tempered glass according to the present invention has very excellent chemical resistance compared to Comparative Examples 1 to 3.

[Light reflectivity measurement experiment of tempered glass]

An experiment for measuring the light reflectivity of the upper surface of the glass plate (the upper surface on which the printed layer is not formed) was performed using the tempered glass plates prepared in Example 1 and Comparative Examples 1 to 3, and the results are described in Table 5 below. . The light reflectivity of the upper surface of the glass plate is measured by measuring the intensity of light (Lux) reflected on the upper surface of the glass plate after irradiating light of 1,000 lux toward the upper surface of the glass plate at a distance of 1 meter from the upper surface of the glass plate to be measured. did.

division Reflected light intensity (Lux) Example 1 52 Comparative Example 1 320 Comparative Example 2 287 Comparative Example 3 315

Looking at the results of Table 5, it can be seen that the glass plate manufactured by the method for manufacturing tempered glass according to the present invention has a very low light reflectance compared to Comparative Examples 1 to 3.

Claims (4)

First printing on the surface of the glass (S400);
Drying the first printed glass in a firing furnace (S500);
Secondary printing on the surface of the dried glass (S600); and
A method of manufacturing a low-reflection tempered glass comprising; strengthening the secondary printed glass by applying heat at a temperature higher than the drying temperature of the firing furnace (S700). The method according to claim 1,
The step (S500) is a method of manufacturing a low-reflection tempered glass, characterized in that carried out at a temperature of 100 to 130 ℃. The method according to claim 1,
The step (S700) is a method of manufacturing a low-reflection tempered glass, characterized in that carried out at a temperature of 650 to 750 ℃. The method according to claim 1,
The step (S100) or step (S300) is a method of manufacturing a low-reflection tempered glass, characterized in that it is performed using a heat-resistant lead-free ceramic ink.

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