KR101916267B1 - Production method for 3d curved glass of mobile device - Google Patents

Abstract

The present invention relates to a method of manufacturing a flat glass, Slicing the flat glass; Attaching the flat glass to a forming mold and applying heat to the forming mold to produce a curved glass including a flat portion and a first curved portion and a second curved portion which are respectively curved at both ends of the flat portion; And printing a contour line of the curved glass with a gravure offset printing apparatus, wherein the forming frame comprises 1 to 20 parts by weight of aluminum oxide (Al ₂ O ₃ ), 75 to 95 parts by weight of silicon dioxide (SiO ₂ ) And 1 to 10 parts by weight of ferric trioxide (Fe ₂ O ₃ ), wherein the gravure offset printing apparatus comprises a cylindrical pattern roller having a pattern formed on a surface thereof, and a pattern roller disposed adjacent to the pattern roller An elastic roller on which the printing material coated on the pattern is transferred; a jig on which the curved glass is placed and on which the curved glass can be rotated by 90 degrees; And a conveying unit that conveys the elastic roller to a surface of the curved glass, wherein the elastic roller is configured to convey the first curved surface portion, the planar surface portion, and the second curved surface portion, A first elastic roller which has a shape in which a first line passing through the first line is sequentially printed and a diameter of which becomes smaller as it goes from the center toward the outer side, and a second elastic roller which, when the jig rotates the curved glass by 90 degrees, And a second elastic roller which moves along the second line which is an end line of the second curved surface portion and prints the second line, wherein the jig includes a seating portion for sucking and fixing the lower surface of the curved glass, And an elastic portion provided on the guide portion and elastically deformed by a pressure exerted on the upper surface of the curved glass by the elastic roller, wherein the seating portion includes a first curved surface portion And a back surface of a support surface for supporting the second curved surface portion forms a curved surface that is symmetrical to the first curved surface portion and the second curved surface portion, And a vacuum tube installed in each of the through holes to absorb the bottom surface of the curved glass. The vacuum tube has a connection pipe connected to a vacuum pump for sucking air, A contact tube having a contact surface formed therein having a diameter increasing toward the upper side so as to be in contact with the lower surface of the curved glass, and a holding piece spaced at equal intervals around the outer periphery of the connecting pipe and formed on the contact surface, A plurality of pipes fixed to the mounting frame so as to be spaced apart from each other and a plurality of cylinders in which the pipes are inserted and insertion grooves for guiding movement of the pipes in the vertical direction are formed, The elastic portion has the above-mentioned angular pipe disposed therein, the lower end thereof is brought into contact with the upper portion of the cylinder, The contact of the spring and mounted to the cylinder, and provides a 3D curve mobile device de-glass manufacturing process comprising the magnetic material that provides a magnetic force to each of the buffer pipe to the respective pipe movement by the spring.

Description

 TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a 3D curved mobile device,

The present invention relates to a 3D curved glass manufacturing method applied to a mobile device.

Mobile devices such as smart phones, smart watches, tablet PCs, and mobile phones have already become widespread with the development of wireless communication technologies.

The user inputs information to the mobile device by using physical buttons in the initial mobile device, but in recent mobile devices, the touch screen of the display device is touched.

Here, the touch screen is a pressure sensitive type in which a pressure signal is inputted and a capacitive type in which a signal is inputted using a current. In recent mobile devices, a capacitive touch screen having excellent reactivity and sensitivity is mainly used.

The glass applied to the touch screen is made of a flat plate and is reinforced to prevent breakage by impact.

In recent years, the number of mobile devices using curved glass is also increasing due to convenience, high design demands of consumers, various types of screens, and commercialization of flexible displays.

Such a curved glass is produced by processing a flat glass using a lathe and a CNC, and molding the flat glass by molding the flat glass at a constant temperature.

However, the conventional method of manufacturing a curved glass has a short life span of the forming mold, requires a large number of polishing processes, low accuracy of curved glass printing, and low productivity, yield and quality.

On the other hand, the background technology of the present invention is disclosed in Korean Patent Publication No. 10-2015-0049159.

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above-mentioned problems, and provides a method of manufacturing a 3D curved mobile device glass which has good productivity, maintains quality at a certain level or higher, and can reduce manufacturing cost and manufacturing time.

A method of manufacturing a 3D curved mobile device glass according to the present invention comprises the steps of: fabricating a flat glass by processing a disc glass; Slicing the flat glass; Attaching the flat glass to a forming mold and applying heat to the forming mold to produce a curved glass including a flat portion and a first curved portion and a second curved portion which are respectively curved at both ends of the flat portion; And printing a contour line of the curved glass with a gravure offset printing apparatus, wherein the forming frame comprises 1 to 20 parts by weight of aluminum oxide (Al ₂ O ₃ ), 75 to 95 parts by weight of silicon dioxide (SiO ₂ ) And 1 to 10 parts by weight of ferric trioxide (Fe ₂ O ₃ ), wherein the gravure offset printing apparatus comprises a cylindrical pattern roller having a pattern formed on a surface thereof, and a pattern roller disposed adjacent to the pattern roller An elastic roller on which the printing material coated on the pattern is transferred; a jig on which the curved glass is placed and on which the curved glass can be rotated by 90 degrees; And a conveying unit that conveys the elastic roller to a surface of the curved glass, wherein the elastic roller is configured to convey the first curved surface portion, the planar surface portion, and the second curved surface portion, A first elastic roller which has a shape in which a first line passing through the first line is sequentially printed and a diameter of which becomes smaller as it goes from the center toward the outer side, and a second elastic roller which, when the jig rotates the curved glass by 90 degrees, And a second elastic roller which moves along the second line which is an end line of the second curved surface portion and prints the second line, wherein the jig includes a seating portion for sucking and fixing the lower surface of the curved glass, And an elastic portion provided on the guide portion and elastically deformed by a pressure exerted on the upper surface of the curved glass by the elastic roller, wherein the seating portion includes a first curved surface portion And a back surface of a support surface for supporting the second curved surface portion forms a curved surface that is symmetrical to the first curved surface portion and the second curved surface portion, And a vacuum tube installed in each of the through holes to absorb the bottom surface of the curved glass. The vacuum tube has a connection pipe connected to a vacuum pump for sucking air, A contact tube having a contact surface formed therein having a diameter increasing toward the upper side so as to be in contact with the lower surface of the curved glass, and a holding piece spaced at equal intervals around the outer periphery of the connecting pipe and formed on the contact surface, A plurality of pipes fixed to the mounting frame so as to be spaced apart from each other and a plurality of cylinders in which the pipes are inserted and insertion grooves for guiding movement of the pipes in the vertical direction are formed, The elastic portion has the above-mentioned angular pipe disposed therein, the lower end thereof is brought into contact with the upper portion of the cylinder, The contact of the spring and mounted to the cylinder, and a magnetic material for providing a magnetic force to each of the buffer pipe to the respective pipe movement by the spring.

The step of fabricating the flat glass may include forming the flat glass by cutting the flat glass with a laser, and forming a hole by laser cutting at a predetermined point of the flat glass.

In the step of skimming the flat glass, the outer edge of the flat glass and the hole may be chamfered.

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And drying and then packaging the curved glass printed in the printing step.

The 3D curved mobile device glass manufacturing method of the present invention has good productivity, can maintain the quality at a certain level or more, and can reduce manufacturing cost and manufacturing time.

The 3D curved mobile device glass manufacturing method of the present invention has a good releasability because a curved glass is formed using a forming frame made of diatomaceous earth.

Further, the forming frame made of diatomaceous earth is not oxidized due to the characteristics of the material of the diatomaceous earth, and there is no phenomenon that the seed is stuck to the curved glass, so that the polishing process can be omitted, and manufacturing cost and manufacturing time can be reduced.

Meanwhile, since the elastic part of the gravure offset printing apparatus used in the 3D curved mobile device glass manufacturing method of the present invention can absorb the load applied to the curved glass, So that uniformity and straightness of the printing thickness of the printing surface of the curved glass can be ensured.

The jig of the gravure offset printing apparatus can adjust the angle of contact between the curved glass and the elastic roller by rotating the curved glass.

The jig of the gravure offset printing apparatus can stably absorb the lower surface of the curved glass.

FIG. 1 is a flowchart of a 3D curved mobile device glass manufacturing method according to an embodiment of the present invention,
FIG. 2 is a flowchart of steps of processing a disc glass of the 3D curved mobile device glass manufacturing method of FIG. 1,
FIG. 3 is a view showing a process of manufacturing a curved glass by the 3D curved mobile device glass manufacturing method of FIG. 1,
4 is a conceptual diagram of a 3D glass forming apparatus according to another embodiment of the present invention,
Fig. 5 is a perspective view of the forming mold of the 3D glass forming apparatus of Fig. 4,
FIG. 6 is a cross-sectional view taken along line AA of FIG. 4,
7 is a conceptual diagram of a gravure offset printing apparatus according to another embodiment of the present invention,
Fig. 8 is an enlarged view of the curved glass of Fig. 3,
Fig. 9 is a perspective view of a jig on which the curved glass of Fig. 8 is seated,
FIG. 10 is a view for explaining a first elastic roller of the gravure offset printing apparatus of FIG. 1, and FIG.
11 is a view for explaining a second elastic roller of the gravure offset printing apparatus of Fig. 7,
12 is a perspective view of a jig of a gravure offset printing apparatus according to another embodiment of the present invention,
FIG. 13 is a view for explaining a seating portion of the jig of FIG. 12,
Fig. 14 is a view for explaining a guide part and an elastic part of the jig of Fig. 12;

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings.

In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the understanding why the present invention is not intended to be a complete disclosure.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements.

Hereinafter, a 3D curved mobile device glass manufacturing method according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a flow chart of a method of manufacturing a 3D curved mobile device glass according to an embodiment of the present invention, FIG. 2 is a flowchart of steps of processing a disc glass of the 3D curved mobile device glass manufacturing method of FIG. 1, Is a diagram illustrating a process of manufacturing a curved glass by the 3D curved mobile device glass manufacturing method of FIG.

1 to 3, a method of manufacturing a 3D curved mobile device glass according to the present invention includes a step S110 of processing a disc glass, a step S120 of cutting a flat glass, a step S120 of forming a curved glass 30, Step S130 and printing step S140.

In the step of processing the original glass (S110), the original glass 10 may be cut into a predetermined shape to produce the flat glass 20.

More specifically, in step S110 of processing the disc glass, a laser beam is irradiated to the disc glass 10 by the laser cutting device 50, and the disc glass 10 is irradiated onto the flat glass (20).

At this time, the laser cutting device 50 can jet the cooling fluid for preventing the deformation of the cut portion of the flat glass 20 by the laser beam along the cutting path of the laser beam.

For example, the laser beam irradiated by the laser cutting device 50 is a CO2 laser beam, and the cooling fluid may be water, ethanol, water-soluble silicone oil, ethanol, or the like. However, the present invention is not limited thereto.

The step S110 of processing the original glass may include a step S111 of producing a flat glass and a step S112 of forming a hole.

In the step S111 of fabricating the flat glass, the disc glass 10 may be cut in a predetermined shape using a laser beam.

In the step of forming the hole (S112), a hole 20a may be formed by laser cutting at a predetermined point of the flat glass 20.

Here, the hole 20a may be a point where a button, a speaker, or the like of a mobile device is installed.

The step of processing the original glass (S110) may further include a step (S113) of checking the state of the flat glass.

In the step S113 of confirming the state of the flat glass, after confirming the defects of the flat glass 20 processed by the laser beam, it is possible to remove the flat glass 20 whose defect has been confirmed.

In step S120 of cutting the flat glass, sharp edges of the hole 20a of the flat glass 20 or the outer edge of the flat glass 20 cut by the laser can be removed.

 The chamfering operation of the flat glass 20 can be performed using a CNC chamfer device.

When the chamfering operation of the flat glass 20 is completed in step S120 of skimming the flat glass, the flat glass 20 may be cleaned.

In step S130 of forming the curved glass 30, the flat glass 20 may be mounted on the mold 110 and heated to deform the curved glass 30.

When the molding of the curved glass 30 is completed in the step S30 of forming the curved glass 30, the curved glass 30 may be cleaned.

In more detail, the flat glass 20 can be formed into the curved glass 30 by using the 3D glass forming apparatus 100 in step S 130 of forming the curved glass 30.

Hereinafter, the 3D glass forming apparatus 100 will be described in detail.

FIG. 4 is a conceptual view of a 3D glass molding apparatus according to another embodiment of the present invention, FIG. 5 is a perspective view of a molding frame of the 3D glass molding apparatus of FIG. 4, and FIG. 6 is a sectional view of A-A of FIG.

4 to 6, the 3D glass forming apparatus 100 may include a forming die 110, a chamber 120, and a transferring unit 230.

The forming frame 110 provides the curved surface 111 so that the flat glass 20 is deformed by its own weight, and can be made of diatomaceous earth.

However, the material of the forming die 110 is not limited to diatomaceous earth, and the forming die 110 may be made of ceramics, graphite, or the like.

The forming die 110 may further include a seating part 112.

Both ends of the flat glass 20 are seated on the seating part 112 and the curved surface part 111 is disposed between the seating parts 112 to provide a curved surface curved downward.

Accordingly, when the heat provided from the chamber 120 is applied to the flat glass 20, the flat glass 20 is deformed to contact the curved surface of the curved surface 111.

The seating part 112 may include an inclined surface 1121 and a groove 1122.

The inclined surface 1121 includes a first inclined surface 1121a and a second inclined surface 1121b and the first inclined surface 1121a and the second inclined surface 1121b face each other, As shown in FIG.

The groove 1122 is formed at the lower end of the inclined surface 1121, and both ends of the flat glass 20 can be inserted and seated.

The groove 1122 may include a first groove 1122a formed at a lower end of the first inclined surface 1121a and a second groove 1122b formed at a lower end of the second inclined surface 1121b.

One end of the flat glass 20 is brought into contact with one of the first inclined surface 1121a and the second inclined surface 1121b and then slides downward so that the first groove 1122a and the second groove 1122b The other end of the flat glass 20 can be easily inserted into the other one of the first groove 1122a and the second groove 1122b.

Meanwhile, the diatomite may include aluminum oxide (Al ₂ O ₃ ), silicon dioxide (SiO ₂ ), and ferric trioxide (Fe ₂ O ₃ ).

In more detail, the diatomite comprises 1 to 20 parts by weight of aluminum oxide (Al ₂ O ₃ ), 75 to 95 parts by weight of silicon dioxide (SiO ₂ ) and 1 to 10 parts by weight of ferric trioxide (Fe ₂ O ₃ ) .

The chamber 120 has a heating space 120b formed therein.

The chamber 120 may provide 350 ° C to 750 ° C heat to the heating space 120b.

Therefore, the flat glass 20 and the forming die 110 transferred to the heating space 120b of the chamber 120 can be supplied with the heat of 350 ° C to 750 ° C by the chamber 120.

When heat is provided between the flat glass 20 and the forming mold 110, the heat stays between the forming mold 110 and the flat glass 20 due to the high thermal insulating property of the thermoplastic resin, The deformed time of the flat glass 20 can be shortened.

The transfer part 230 may transfer the forming mold 110 to the inside and the outside of the chamber 120. More specifically, the transfer unit 230 transfers the forming die 110 to the heating space 120b through one side of the chamber 120, and transfers the forming die 110 to the heating space 120b through the other side of the chamber 120 120b may be transferred to the outside.

The transfer unit 230 may transfer the forming die 110 in a circulating manner.

The chamber 120 may further include a first space 120a and a second space 120c and the transfer unit 230 may transfer the forming die 110 from the outside to the first space 120a. A second transfer part 132 for transferring the chamber 120 in the heating space 120b and a second transfer part 132 for transferring the chamber 120 to the outside in the second space 120c. And a third transfer unit 133. [

The first door 221 between the first space 120a and the outside is opened and the second door 120b between the first space 120a and the heating space 120b is opened, The first transfer part 131 moves to the second space 120c when the second transfer part 122 is closed.

When the first door 221 is closed and the second door 122 is opened, the forming die 110 can be moved by the internal transferring part 230 into the heating space 120b.

The curved glass 30 formed in the heating space 120b moves to the second space 120c when the third door 123 between the heating space 120b and the second space 120c is opened The third door 123 is closed and the fourth door 124 between the second space 120c and the outside is opened so that the forming die 110 can be transferred to the outside by the third transferring unit 133 have.

Example  One_ Molding frame  Produce

The mold was made of diatomaceous earth containing 12.3% of aluminum oxide (Al ₂ O ₃ ), 80.1% of silicon dioxide (SiO ₂ ), 8.2% of ferric trioxide (Fe ₂ O ₃ ) and the remaining minerals, , The length and height are 40 cm * 15 cm * 10 cm, and the interval between the grooves is 30 cm.

Example  2_ Molding frame  Produce

The mold was made of diatomaceous earth containing 10.2% of aluminum oxide (Al ₂ O ₃ ), 85.3% of silicon dioxide (SiO ₂ ), 5.8% of ferric trioxide (Fe ₂ O ₃ ) and the remaining minerals, , The length and height are 40 cm * 15 cm * 10 cm, and the interval between the grooves is 30 cm.

Example  3_ Molding frame  Produce

The mold was made of diatomaceous earth containing 8.6% of aluminum oxide (Al ₂ O ₃ ), 89.1% of silicon dioxide (SiO ₂ ), 3.2% of ferric trioxide (Fe ₂ O ₃ ) and the remaining minerals, , The length and height are 40 cm * 15 cm * 10 cm, and the interval between the grooves is 30 cm.

Experimental Example  1_ of curved glass  surface  Foreign body inspection

A flat glass 20 of 30 cm * 10 cm * 35 mm in width, length and thickness was mounted on the forming molds prepared in Examples 1 to 3, and the mold and the flat glass were heated for 23 minutes in a heating space at a temperature of 720 캜 (20). The molded curved glass 30 was taken out of the chamber, cooled at room temperature, and then cleaned.

Unlike the molding frame made of graphite, the molding frame according to Examples 1 to 3 had no foreign substance on the surface of the manufactured curved glass 30 and was not found as a seed embedded in the curved glass 30.

Experimental Example  2_ heat exposure temperature and time Mold  transform

The molds of Examples 1 to 3 were heated in a chamber at a temperature of 900 ° C to measure the strain of the distance from the first groove to the second groove. The heating time of the mold was changed to 20 minutes, 25 minutes, 30 minutes, 35 minutes and 40 minutes.

Table 1 shows the strain of the mold of Example 1 according to the heating time, Table 2 shows the strain of the mold of Example 2 with heating time, and Table 3 shows the strain of the mold of Example 3 And the strain rate of the mold.

Turn Heating time Strain One 20min 0.00001 2 25 min 0.00001 3 30min 0.00001 4 35min 0.00001 5 40min 0.00001

Turn Heating time Strain One 20min 0.00001 2 25 min 0.00001 3 30min 0.00001 4 35min 0.00001 5 40min 0.00001

Turn Heating time Strain One 20min 0.00001 2 25 min 0.00001 3 30min 0.00001 4 35min 0.00001 5 40min 0.00001

As shown in Tables 1 to 3, it was confirmed that the molds according to Examples 1 to 3 were hardly deformed by the temperature, and thus were suitable for a glass requiring precise molding.

Experimental Example  3_ Mold  Available count

A flat glass 20 of 30 cm * 10 cm * 35 mm in width, length and thickness was mounted on the forming molds prepared in Examples 1 to 3, and the mold and the flat glass were heated for 23 minutes in a heating space at a temperature of 720 캜 Heat was applied to the curved glass plate 20, the molded curved glass plate 30 was taken out of the chamber, cooled at a normal temperature, and the curved glass plate 30 was removed from the mold.

There was hardly any change in the curvature of the curved portion of each of the forming molds manufactured in Examples 1 to 3 and the intervals between the grooves. The number of usable times was confirmed to be 3,000 times or more.

The 3D curved mobile device glass manufacturing method may further include a step S132 of reinforcing the curved glass.

In the step of strengthening the curved glass 30, heat is applied to the curved glass 30, and the curved glass 30 is rapidly frozen to compressively deform the curved glass 30, It is possible to increase the mechanical strength of the curved glass 30 by tensile deformation of the inside of the curved glass 30.

The 3D curved mobile device manufacturing method may further include a step S134 of checking the state of the curved glass.

In the step S134 of confirming the state of the curved glass, it is possible to check whether the curved glass 30 is reinforced, and to remove the flat glass 20 from which the defect is confirmed.

The printing step S140 may print the curved glass 30 with the printing material 30a.

For example, the printing step (S140) may print the outline of the curved glass 30 as a black matrix layer.

The black matrix layer is printed with black ink on the outer surface of the curved glass 30, thereby absorbing the reflection of external light and improving the contrast.

The curved glass 30 may be printed in the gravure offset printing method using the gravure offset printing apparatus 200 in the printing step S140.

Hereinafter, the gravure offset printing apparatus 200 will be described in detail.

FIG. 7 is a conceptual diagram of a gravure offset printing apparatus according to another embodiment of the present invention, FIG. 8 is an enlarged view of a curved glass of FIG. 3, and FIG. 9 is a perspective view of a jig on which a curved glass of FIG. 8 is seated.

7 to 9, the gravure offset printing apparatus 200 prints the outline lines L1 and L2 of the curved glass 30 on which curved curved portions 32a and 32b are formed at one or more portions .

The curved glass 30 has a planar portion 31 and a first curved portion 32a and a second curved portion 32b that extend from both ends of the planar portion 31 and are curved, (Hereinafter referred to as " first curved glass ") will be described as an example.

The gravure offset printing apparatus 200 includes a pattern roller 210, an elastic roller 220, a transfer unit 230, and a jig 240.

The pattern roller 210 may have a cylindrical shape and a pattern 210a may be formed on the surface thereof. The pattern 210a indicates the shape of a groove on the surface of the pattern roller 210. [

The gravure offset printing apparatus 200 may further include a blade 250.

The blade 250 is disposed adjacent to the pattern roller 210 and can remove the printing material 30a on the surface of the pattern roller 210 by scraping the surface of the rotating pattern roller 210. [

More specifically, when the blade 250 scrapes the surface of the pattern roller 210, only the print material 30a of the pattern 210a remains, and the printing material on the surface of the pattern roller 210 (30a) is removed by the blade (250).

The elastic roller 220 is disposed adjacent to the pattern roller 210 and may be rotated in contact with the pattern roller 210.

Accordingly, the printing material 30a remaining on the pattern 210a may be transferred to the elastic roller 220. [

The transfer unit 230 transfers the first curved glass in a first direction D1 in which the elastic roller 220 rotates to contact the surface of the first curved glass 220 with the elastic roller 220 have.

More specifically, the first curved glass may be seated on the jig 240, and the jig 240 may be transported in the first direction D1 by the transporting unit 230. The first curved glass placed on the jig 240 is in contact with the elastic roller 220 and the printing material 30a transferred to the elastic roller 220 can be transferred to the first curved glass .

FIG. 10 is a view for explaining a first elastic roller of the gravure offset printing apparatus of FIG. 1;

Referring to FIG. 10, the elastic roller 220 may include a first elastic roller 221.

The first elastic roller 221 may have a shape in which the diameter decreases toward the outer side (P2, second portion) from the center (P1, first portion).

Wherein the second portion may be a portion spaced apart at the same position on both sides of the first portion.

Since the first elastic roller 221 is deformed to be in contact with the first curved glass sequentially from the first portion to the second portion when the first curved glass is in contact with the first curved glass, The problem of trapping air between the elastic rollers 221 can be prevented.

Particularly, in the second direction D2 in which the first elastic roller 221 is perpendicular to the first direction D1, the first curved surface portion 32a and the second curved surface portion 32b, which are both ends of the first curved glass, Since air is prevented from being trapped between the first curved glass and the first elastic roller 221 when printing the first line L1 sequentially passing through the first curved portion 31 and the second curved portion 32b, It is possible to prevent the print quality of the first line (L1) from being lowered.

Experimental Example  One_ With flat roller The first elastic roller  Comparison of defect rate

The first curved surface portion 32a of the first curved glass and the second curved surface portion of the first curved glass portion 221 are formed by a gravure-offset printing method using a cylindrical flat transfer roller and the first elastic roller 221, 31) and the second curved surface portion 32b were successively printed six times and the error was measured. Here, the error means a distance deviating from the set straight line.

Turn Plane transfer roller The first elastic roller One 0.41mm 0.02 mm 2 0.42mm 0.02 mm 3 0.40mm 0.00mm 4 0.41mm 0.03mm 5 0.41mm 0.02 mm 6 0.43mm 0.01mm 7 0.42mm 0.02 mm

As shown in Table 4, when the first line L1 was printed using a cylindrical transfer roller, the error was about 0.40 mm.

However, when the first elastic roller 221 was used to print the first line L1, the error was measured to be about 0.02 mm. When the first line L1 is printed using the first elastic roller 221, an error hardly occurs.

That is, when the first elastic roller 221 of the present invention is used, it is possible to print the first line L1 with an error within a range of 0.12 mm, which is an error reference value required by the manufacturer.

Experimental Example  2_ With flat roller The first elastic roller  Comparison of defect rate

The first curved surface portion 32a of the first curved glass and the second curved surface portion of the first curved glass portion 221 are formed by a gravure-offset printing method using a cylindrical flat transfer roller and the first elastic roller 221, 31, and the second curved surface portion 32b in that order.

Plane transfer roller The first elastic roller Defect rate 0.52 0.02

As can be seen from Table 5, when the first line (L1) was printed by using a cylindrical transfer roller, printing failure occurred 52 times during printing 100 times.

However, when printing the first line (L1) using the first elastic roller 221, two printing failures occurred during printing 100 times. When printing the first line L1 using the first elastic roller 221, it can be confirmed that the printing material 30a is uniformly transferred to the first line L1 without being affected by bubbles .

11 is a view for explaining a second elastic roller of the gravure offset printing apparatus of Fig.

11, the jig 240 may rotate the first curved glass by 90 DEG in the second direction D2

The elastic roller 220 may further include a second elastic roller 222.

The second elastic roller 222 may transfer the printing material 30a to both ends of the first curved glass rotated 90 ° in the second direction D2 in the first direction D1.

That is, the second elastic roller 222 moves along the second line L2, which is the end line of the first curved surface portion 32a and the second curved surface portion 32b, It is possible to print.

The back surface 140b of the support surface 140a of the jig 240 supporting the first curved surface portion 32a and the second curved surface portion 32b may be formed in the same plane as the first curved surface portion 32a and the second curved surface portion 32b, A curved surface that is symmetrical with the second curved surface portion 32b can be formed.

When the back surface 140b of the jig 240 is symmetrical with respect to the first curved surface portion 32a and the second curved surface portion 32b, the deformation of the second elastic roller 222 in a plane is symmetrical The accuracy of printing of the second line L2 can be ensured.

FIG. 12 is a perspective view of a jig of a gravure offset printing apparatus according to another embodiment of the present invention, and FIG. 13 is a view for explaining a seating portion of the jig of FIG.

12 and 13, the jig 240 may include a seating part 241, a guide part 242, and an elastic part 243.

The seating portion 241 can adsorb and fix the lower surface of the first curved glass

The seating portion 241 may include a mounting frame 2411 and a vacuum tube 2412. [

A seating surface 241a corresponding to the shape of the first curved glass is formed on the mounting frame 2411 and a plurality of through holes 241b are formed on the seating surface 241a.

The vacuum tube 2412 is installed in each of the through holes 241b to absorb the lower surface of the first curved glass.

More specifically, the vacuum tube 2412 may include a connection tube 2412a, a contact tube 2412b, and a plurality of latching pieces 2412c.

The connection pipe 2412a may be connected to a vacuum pump that sucks air to provide a vacuum to the contact tube 2412b.

And the contact tube 2412b extends from the upper end of the connection tube 2412a. Inside the contact tube 2412b, a contact surface 2412d having a larger diameter toward the upper side is formed so as to be in contact with the lower surface of the first curved glass.

More specifically, the contact surface 2412d refers to the inner surface of the contact tube 2412b that is in contact with the lower surface of the first curved glass, and the contact surface 2412d contacts the lower surface of the first curved glass When the connection pipe 2412a provides a vacuum to the contact tube 2412b, the contact surface 2412d is increased in contact area with the lower surface of the first curved glass, and the contact tube 2412b The vacuum pressure is increased and the contact tube 2412b can adsorb the lower surface of the first curved glass.

The plurality of latching pieces 2412c are formed at equal intervals below the contact surface 2412d.

The engaging piece 2412c can prevent the contact area between the contact surface 2412d and the lower surface of the first curved glass from decreasing because the vacuum pressure applied to the contact tube 2412b becomes larger than necessary.

The upper end of the contact surface 2412d protrudes upward from the seating surface 241a and the plurality of locking pieces 2412c are positioned below the seating surface 241a It is possible to do.

According to this structure, the plurality of latching pieces 2412c move finely upward at the first position and can be brought into contact with the first curved glass, and the plurality of latching pieces 2412c are connected to the connection pipe 2412a, It is possible to prevent the connection pipe 2412a from moving excessively toward the first curved glass side when providing vacuum to the contact tube 2412b.

Fig. 14 is a view for explaining a guide part and an elastic part of the jig of Fig. 12;

14, the guide part 242 guides the movement of the seating part 241 in the vertical direction.

The guide portion 242 may include a plurality of pipes 2421 and a cylinder 2422.

The plurality of pipes 2421 may be fixed to the mounting frame 2411 so as to be spaced apart from each other.

For example, four of the plurality of pipes 2421 are fixed to the lower end of the mounting frame 2411 and can be arranged long in the vertical direction.

The square pipe 2421 is inserted into the cylinder 2422 and an insertion groove 1422a for guiding the vertical movement of the pipe 2421 can be formed.

That is, the plurality of pipes 2421 can move up and down in the insertion groove 1422a.

The elastic portion 243 is provided on the guide portion 242 and can be elastically deformed by the pressure applied to the upper surface of the first curved glass by the elastic roller 220.

For example, the elastic portion 243 may include a spring 2431.

The lower end of the spring 2431 is in contact with the upper portion of the cylinder 2422 and the upper end of the spring 2431 is in contact with the mounting frame 2411, respectively.

Therefore, when the elastic roller 220 presses the upper surface of the first curved glass, the mounting frame 2411 presses the angular pipe 2421 downward.

At this time, both ends of the spring 2431 are respectively contracted by the upper end of the cylinder 2422 and the lower end of the seating part 241, and the elastic roller 220 presses the first curved glass at a constant pressure .

The elastic portion 243 may further include a magnetic body 2432. Since the magnetic body 2432 can provide a magnetic force to the square pipe 2421 to buffer the movement of the square pipe 2421 by the spring 2431, the precision of the first curved glass printing .

Referring again to FIG. 12, the jig 240 may further include a first plate 244 and a second plate 245.

The first plate 244 is transported by the transport unit 230.

The second plate 245 is rotatably installed on the first plate 244, and the cylinder 2422 is fixed.

Accordingly, when the second plate 245 rotates at a predetermined angle, the cylinder 2422 and the plurality of pipes 2421 rotate, and accordingly, the first curved glass It can rotate.

That is, the second plate 245 rotates the first curved glass to adjust the angle of contact between the first curved glass and the elastic roller 220.

When the printing of the curved glass 30 is completed in the printing step S140, the curved glass 30 may be dried and cleaned.

The 3D curved mobile device manufacturing method may further include forming an anti-glare layer (S150).

In the step of forming the anti-glare layer (S150), one surface of the curved glass is etched using fluorine (F) or hydrogen fluoride (HF) to form an antiglare (AG) Glare layer can be formed.

The curved glass 30 on which the anti-glare (AG) is formed can be dried and cleaned.

The 3D curved mobile device glass manufacturing method may further include forming an AR layer and an AF layer (S160).

In the step of forming the AR layer and the AF layer (S160), an anti-reflection (AR) deposition layer for preventing reflection of light and an anti-fingerprint deposition layer 120 for preventing fingerprints are formed It can be.

And the curved glass 30 on which the AR layer and the AF layer are respectively formed may be dried and cleaned and then packaged.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them.

Furthermore, all terms including technical or scientific terms described above have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or essential characteristics thereof. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: Disc glass
20: Flat glass
30: Surface glass
100: 3D glass molding machine
200: gravure offset printing device

Claims (5)

Fabricating a flat glass by processing a disc glass;
Slicing the flat glass;
Attaching the flat glass to a forming mold and applying heat to the forming mold to produce a curved glass including a flat portion and a first curved portion and a second curved portion which are respectively curved at both ends of the flat portion; And
And printing an outline of the curved glass with a gravure offset printing apparatus,
Wherein the forming die is made of diatomaceous earth containing 1 to 20 parts by weight of aluminum oxide (Al ₂ O ₃ ), 75 to 95 parts by weight of silicon dioxide (SiO ₂ ) and 1 to 10 parts by weight of ferric trioxide (Fe ₂ O ₃ ) Made,
The gravure offset printing apparatus includes:
A cylindrical pattern roller having a pattern formed on its surface,
An elastic roller which is disposed adjacent to the pattern roller and onto which the printing material applied to the pattern is transferred,
A jig on which the curved glass is seated and capable of rotating the curved glass by 90 °,
And a conveying unit that conveys the jig in a first direction in which the elastic roller is rotated to bring the elastic roller into contact with the surface of the curved glass,
The elastic roller
A first elastic roller which has a shape in which a first line passing through the first curved portion, the plane portion and the second curved portion sequentially out of the outline lines is printed and the diameter becomes smaller toward the outer side from the center,
And a second elastic roller for printing the second line while moving along a second line which is an end line of the first curved surface portion and the second curved surface portion among the outline lines when the jig rotates the curved glass by 90 ° and,
The jig,
A seating part for sucking and fixing the lower surface of the curved glass,
A guide portion for guiding movement of the seat portion in a vertical direction,
And an elastic portion provided on the guide portion and elastically deformed by a pressure applied to the upper surface of the curved glass by the elastic roller,
The seat (1)
A mounting frame having a plurality of through holes formed therein and forming a curved surface whose back surface of the supporting surface for supporting the first curved surface portion and the second curved surface portion is symmetrical to the first curved surface portion and the second curved surface portion,
And a vacuum tube provided in each through hole for absorbing the lower surface of the curved glass,
In the vacuum tube,
A connection pipe connected to a vacuum pump for sucking air,
A contact tube extending from an upper end of the connection tube and having a contact surface having a diameter increasing toward the upper side so as to be in contact with a lower surface of the curved glass;
And an engagement piece formed on the contact surface at equal intervals around the outer periphery of the coupling tube,
The guide portion
A plurality of pipes fixed to the mounting frame so as to be spaced apart from each other,
And a plurality of cylinders in which the angular pipes are inserted and in which insertion grooves for guiding movement of the angular pipes in the vertical direction are formed,
The elastic portion
A spring which is disposed inside the pipe, the lower end of which is in contact with the upper portion of the cylinder, and the upper end of which is in contact with the lower surface of the mounting frame,
And a magnetic body installed in the cylinder and buffering movement of the angular pipe by the spring by providing a magnetic force to the angular pipe.
The method according to claim 1,
The step of fabricating the flat glass may include:
Cutting the disc glass with a laser to manufacture the flat glass;
And forming a hole by laser cutting at a set point of the flat glass.
The method of claim 2,
Wherein the outer surface of the flat glass and the hole are faced in the step of flattening the flat glass.
delete The method of claim 2,
And drying and then packaging the curved glass printed in the printing step.

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