Processing method of UTG with partial coating

Abstract

The processing method of forming a partially coated UTG of the present invention comprises the following steps: a step (S1) of coating the entire front surface of an original thin-film glass (1) with a coating liquid for preventing contact with chemicals and then drying it to form a coating; a step (S2) of forming a partial coating (2) on the back surface of the original thin-film glass (1) in the same shape as the room unit thin-film glass (3) to be cut from the original thin-film glass (1); and a step (S3) of cutting and separating the room unit thin-film glass (3) from the original thin-film glass (1) by irradiating a laser beam to the back surface of the original thin-film glass (1) and irradiating a laser beam along a line to be cut (6) which is separated from the outer contour of the partial coating (2) by a predetermined interval and is formed in the shape of the room unit thin-film glass (3) in order to cut the coating formed on the front surface of the original thin-film glass (1) and the original thin-film glass (1).

Description

Technical Field

[0001] The present invention relates to a processing method for forming a partially coated UTG, and more specifically, to a method for post-processing after using an infrared laser to cut an original thin film glass in which one side is entirely coated with an acid-resistant coating and the opposite side is partially coated in the shape of a cell unit thin film glass. Background Art

[0002] In recent years, due to the ultra-thinness of electronic products such as smartphones, the ordinary glass or acrylic used in the past is being replaced by thin-film glass.

[0003] Such thin film glass is used as a display window for portable electronic products such as mobile phones, PMPs, and MP3s. The thinner the thin film glass is, the more advantageous it is in terms of design and portability.

[0004] In order to manufacture room unit film glass suitable for various electronic products, the original film glass needs to be cut into a certain size.

[0005] At this time, fine cracks (Crack) or fine chips (Chipping) generated during cutting will cause the strength of the cut cell unit film glass to decrease. In order to minimize this, scraping and chamfering processes are further performed.

[0006] However, since the original film glass of this process is very thin, it may be damaged during the scraping and chamfering process. In addition, scraping and chamfering the film glass of the room unit suitable for the product will cause great loss of manpower and time.

[0007] In order to solve these problems, a method has been proposed in which raw film glasses are joined and laminated and then processed as a whole.

[0008] The method of bonding and laminating the original thin film glass and then processing it as a whole includes a first embodiment using CNC processing and a second embodiment using laser beam processing. The first embodiment using CNC processing is described in detail below.

[0009] First, if the first embodiment is classified, it includes the following steps: a step of laminating two or more original thin-film glasses, and coating a resin for maintaining a height interval between the two or more original thin-film glasses according to a preset pattern; a step of cutting the two or more laminated original thin-film glasses by CNC processing, and cutting out room unit thin-film glasses suitable for various electronic products from the original thin-film glasses; a step of smoothly trimming the cut surface of the laminated multiple room unit thin-film glasses by chemical healing; a step of cleaning the repaired room unit thin-film glasses; a step of completely hardening the resin coated between the room unit thin-film glasses and the room unit thin-film glasses to make them easy to peel off; a step of peeling off the resin adhered between the room unit thin-film glasses and the room unit thin-film glasses; a step of cleaning the room unit thin-film glasses from which the resin has been removed; a step of chemically healing the room unit thin-film glasses that have been cleaned; a step of cleaning the room unit thin-film glasses that have been chemically repaired, and sending the cleaned room unit thin-film glasses to subsequent processes after strengthening.

[0010] The steps of stacking more than two original thin-film glasses and coating a resin for maintaining a height interval between the two or more original thin-film glasses according to a preset pattern include: step 1-1, coating the resin on the original thin-film glass; step 1-2, stacking the original thin-film glass on the coated resin and then thinly spreading the resin; step 1-3, UV curing the thinly spread resin; repeatedly implementing steps 1-1 to 1-3 to stack more than two original thin-film glasses.

[0011] However, the first embodiment requires the implementation of a process of laminating two or more original thin-film glasses using resin, a CNC cutting process including rough cutting, heavy cutting and fine cutting processes for cutting the laminated original thin-film glasses into room unit thin-film glasses, a process of smoothing the cut surfaces of the laminated room unit thin-film glasses by chemically healing the laminated room unit thin-film glasses, a process of completely curing the resin to facilitate separation of the laminated room unit thin-film glasses, a process of cleaning the room unit thin-film glasses after stripping off the resin, and a process of cleaning the room unit thin-film glasses after chemically healing the room unit thin-film glasses. Therefore, a longer manufacturing time of the room unit thin-film glasses is required, and the production cost of the room unit thin-film glasses is increased.

[0012] Next, the second embodiment will be described in detail.

[0013] The second embodiment of the laser beam processing is roughly classified as follows: a step of cutting the original thin film glass by irradiating a laser beam along the cutting line of the original thin film glass, and cutting out a room unit thin film glass from the original thin film glass; a second step of stacking two or more cut room unit thin film glasses, and applying a height spacing resin between the upper and lower room unit thin film glasses; a third step of smoothly trimming the cut surfaces of the room unit thin film glasses stacked with more than two layers by chemically healing; a fourth step of cleaning the stacked room unit thin film glasses; a fifth step of completely curing the resin coated between the stacked multiple room unit thin film glasses and the room unit thin film glasses to make them easy to peel off; a sixth step of cleaning and separating the room unit thin film glasses into individual ones after peeling off the resin adhering to the room unit thin film glasses; a seventh step of chemically healing the cleaned room unit thin film glasses; and an eighth step of cleaning the cleaned room unit thin film glasses after chemically healing, and sending them to subsequent processes after a strengthening process.

[0014] Furthermore, the second step of stacking two or more cut chamber unit film glasses and coating a height spacing resin between the upper and lower arranged chamber unit film glasses comprises the following steps: a step 2-1 of stacking two or more cut chamber unit film glasses and coating a height spacing resin between a pair of upper and lower arranged chamber unit film glasses; a step 2-2 of stacking the chamber unit film glasses on the coated resin and then thinly spreading the resin; a step 2-3 of UV curing the flatly spread resin; and repeatedly performing the steps 2-1 to 2-3 to stack two or more cut chamber unit film glasses.

[0015] However, the method using the laser beam requires the implementation of a process of laminating two or more cut chamber unit film glasses using resin, a process of completely curing the resin coated between the laminated chamber unit film glasses, a process of peeling off the resin and separating the laminated chamber unit film glasses, and thus requires a longer chamber unit film glass manufacturing time and also increases the production cost of the chamber unit film glass.

[0016] Furthermore, the problem with the glass cutting method using CNC is that defects such as fine cracks or fine chips will appear on the cut surface, while the problem with the glass cutting and coating removal method using laser is that the chamber unit film glass is easily broken due to thermal damage in the laser irradiated part.

[0017] Such micro cracks or chipping defects caused by CNC or thermal damage caused by laser can also cause a decrease in bending strength after strengthening of the cell unit thin film glass.

[0018] In order to compensate for the weakened portion of the CNC or laser cut surface, the main method used is, as in the first and second embodiments, a method of stacking the chamber unit film glass into multiple layers using resin and then performing chemical treatment on the cut surface to repair defects or thermal damage caused when cutting the glass.

[0019] However, this cut surface processing method also has limitations. When using CNC or laser technology to cut thin film glass, it is necessary to ensure that the damage to the thin film glass can be minimized. However, when ensuring this method, the process margin will become smaller, and the processing time of the room unit thin film glass suitable for various electronic products will be longer. Moreover, if further surface treatment process is performed, the manufacturing process of the room unit thin film glass will become very complicated, which may lead to an increase in product manufacturing costs.

[0020] In addition, the prior art disclosed in the present invention is the "Effective Processing Method for Thin Plate Glass" with application number "10-2010-0026394", which includes: a process of applying an adhesive between multiple stacked glass discs to bond the multiple glass discs to each other, and batch cutting the bonded glass discs in units of blocks; a process of scraping the thin plate material in units of blocks; and a process of polishing the cut cross-section using the rotational force of a brush and a polishing material.

[0021] However, the above-mentioned effective processing method of thin plate glass has the following problem: due to the scraping process and the polishing process, there are parts of the cut surface of the thin plate glass where fine cracks or fine chipping defects cannot be completely removed. Summary of the invention

[0022] Technical problem to be solved by the invention

[0023] Therefore, the object of the present invention is to provide a processing method for forming a partially coated UTG in order to solve the above-mentioned problems, which can reduce production costs in the glass cutting process and post-processing process implemented when manufacturing room unit film glass (UTG: Ultra-Thin Glass) suitable for various electronic products.

[0024] Furthermore, another object of the present invention is to provide a method for processing UTG with a partial coating, so as to reduce the manufacturing cost of the chamber unit thin-film glass by simplifying the manufacturing process of the chamber unit thin-film glass.

[0025] Furthermore, another object of the present invention is to provide a processing method for UTG with partial coating, which removes the thermal damage around the cut surface of the glass caused by the laser beam when cutting the glass with a laser and removing the coating through selective chemical treatment, thereby improving the durability of the processed room unit film glass.

[0026] Technical solutions to solve problems

[0027] The processing method of the UTG for forming a partial coating of the present invention for achieving the above-mentioned purpose comprises the following steps: a step (S1) of coating the entire front surface of the original film glass 1 with a coating liquid for preventing contact with chemicals and then drying it to form a coating; a step (S2) of forming a partial coating 2 on the back surface of the original film glass 1 that is consistent with the shape of the room unit film glass 3 to be cut from the original film glass 1; and a step (S3) of cutting and separating the room unit film glass 3 from the original film glass 1 by irradiating a laser beam on the back surface of the original film glass 1 and irradiating a laser beam along a line 6 to be cut that is separated from the outer contour of the partial coating 2 by a predetermined interval and is formed in the shape of the room unit film glass 3, in order to cut the coating formed on the front surface of the original film glass 1 and the original film glass 1.

[0028] The line to be cut 6 is separated from the outer contour of the partial coating 2 by 1um to 100um. The coating liquid used to form the front coating and the rear partial coating 2 of the original thin-film glass 1 is an acid-resistant coating liquid. The laser beam utilizes the laser beam output from the infrared laser 4.

[0029] Effects of the Invention

[0030] The processing method of partially coating UTG formed by such steps of the present invention can reduce production costs in the glass cutting process and post-processing process when manufacturing ultra-thin glass (UTG) suitable for various electronic products.

[0031] Furthermore, in the present invention, the manufacturing cost of the chamber unit film glass is reduced by simplifying the manufacturing process when manufacturing the chamber unit film glass. When laser cutting and coating removal are performed, thermal damage around the cut surface of the glass caused by the laser beam is removed by selective chemical treatment, thereby improving the durability of the processed chamber unit film glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a control block diagram of the present invention;

[0033] Figure 2is a longitudinal sectional view of the film glass in the original state with the coating formed entirely on the front and partially on the back;

[0034] Figure 3 It is a rear view of the film glass in the original state with a partial coating formed on the back;

[0035] Figure 4 is a diagram for illustrating the line to be cut;

[0036] Figure 5 This is a diagram showing a bevel-shaped cut portion formed at a right-angled corner portion of a cell unit film glass in contact with a coating film when the cut cell unit film glass is repaired (healing).

[0037] Reference numerals

[0038] 1: Original film glass 2: Partially coated

[0039] 3: Room unit film glass 4: Infrared laser

[0040] 5: Bevel cutting part 6: Line to be cut DETAILED DESCRIPTION

[0041] The present invention will be described in detail below with reference to the accompanying drawings.

[0042] The processing method of the UTG forming a partial coating of the present invention is as follows Figures 1 to 4 As shown, the method comprises the following steps: a step (S1) of coating the entire front surface of the original film glass 1 with a coating liquid for preventing contact with chemicals, and then drying the coating liquid to form a coating film; a step (S2) of forming a partial coating film 2 on the back surface of the original film glass 1 that is consistent with the shape of the room unit film glass 3 to be cut from the original film glass 1; and a step (S3) of cutting and separating the room unit film glass 3 from the original film glass 1 by irradiating a laser beam to the back surface of the original film glass 1 and irradiating a laser beam along a line 6 to be cut that is separated from the outer contour of the partial coating film 2 by a predetermined interval and is formed in the shape of the room unit film glass 3, in order to cut the coating film formed on the front surface of the original film glass 1 and the original film glass 1.

[0043] The original state film glass 1 is the film glass 1 in the original state before the room unit film glass 3 is separated from the original state film glass 1, and is also called mother glass.

[0044] The cell unit thin film glass 3 is thin film glass cut and separated from the original thin film glass 1 .

[0045] Furthermore, the present invention Figure 1As shown, the following steps are also included: in order to remove the thermal damage and defective parts around the cut surface of the chamber unit film glass 3 generated during the laser cutting process, the cut chamber unit film glass 3 is subjected to selective chemical treatment, and the step of repairing (Healing) the laser cut surface of the chamber unit film glass 3 (S4); after cleaning the chamber unit film glass 3, a step of completely removing the coating formed on the surface of the chamber unit film glass 3 (S5); and in order to remove the defects or flaws on the surface of the chamber unit film glass 3 from which the coating has been completely removed, the step of chemically repairing (Healing) the surface of the chamber unit film glass 3 after cleaning the chamber unit film glass 3 from which the coating has been completely removed (S6).

[0046] Preferably, the to-be-cut line 6 is spaced 1 um to 100 um away from the outer contour of the portion of the coating film 2 .

[0047] The thickness of the original film glass 1 and the room unit film glass 3 is less than 100 um.

[0048] The thickness of the coating film formed on a certain surface of the film glass 1 in the original state is less than 30 μm.

[0049] The original film glass 1 is made of sodium aluminosilicate glass.

[0050] Furthermore, the present invention Figure 1 As shown, the method further includes the following steps: after cleaning the chamber unit film glass 3 whose surface has been repaired, a strengthening step (S7) is performed.

[0051] The laser beam is a laser beam output from the infrared laser 4 , and the laser beam output from the infrared laser 4 has a wavelength of 1000 nm or more.

[0052] The infrared laser 4 uses a nanosecond infrared laser 4, a picosecond infrared laser 4, or a femtosecond infrared laser 4, and the infrared laser 4 outputs a Bessel beam.

[0053] The infrared laser 4 outputting a Bessel beam has a laser beam wavelength of 1020 nm to 1040 nm, a laser beam size of 0.8 um to 1.8 um, and a laser beam pulse duration of 3 ps to 12 ps.

[0054] In addition, the pulse repetition rate of the laser beam is 190 khz to 210 khz, and the pulse energy is 3 uJ to 42 uJ.

[0055] The coating liquid used to form the coating film on the front and the partial coating film 2 on the back of the original thin-film glass 1 is an acid-resistant coating liquid, which must be an acrylic acid solution or a solution with an ultraviolet absorption rate of 10% or more in the ultraviolet wavelength band below 400nm in polyethylene resin, polypropylene resin, polyvinyl chloride resin, and polystyrene resin, and an infrared absorption rate of 1% or less in the infrared wavelength band above 1000nm. When the coating liquid is applied to the front or back of the original thin-film glass 1, a slot die coating method, a spray coating method, an inkjet coating method, a barcode method, a screen printing method, a slot coating pattern segmentation printing method, etc. can be used.

[0056] The coating liquid may be dried using an infrared lamp, a hot air blower, a hot plate, an oven, or a cluster type or inline type drying device.

[0057] In order to remove the thermally damaged parts and defective parts around the cut surface of the room unit film glass 3 generated during the laser cutting process, the cut room unit film glass 3 is selectively chemically treated. In the step (S4) of repairing (healing) the laser cut surface of the room unit film glass 3, the right-angled corners of the room unit film glass 3 that are connected to the coating formed on the front and rear sides of the room unit film glass 3, such as Figure 5 As shown, a bevel-shaped cutting portion 5 with a bevel shape is formed based on a healing solution, and the lateral width (W) of the bevel-shaped cutting portion 5 is 3um to less than 500um, and the height (H) of the bevel-shaped cutting portion 5 is greater than 3um and does not exceed 50% of the thickness of the unit film glass 3 of the chamber.

[0058] The cell unit film glass 3 is immersed in a repair solution to complete the repair. The repair solution includes ammonium bifluoride, sulfuric acid, nitric acid, water and additives.

[0059] The additive is a surfactant used to improve the repair performance, and the surfactant plays a role in reducing surface tension and increasing the uniformity of repair.

[0060] The repair solution comprises: 0.5 to 0.9 weight % of ammonium bifluoride, 3 to 15 weight % of sulfuric acid, 1 to 10 weight % of nitric acid, 80 to 90 weight % of water, and 0.01 to 0.1 weight % of additives.

[0061] The surfactant is a compound represented by the following Chemical Formula 1.

[0062] [Chemical formula 1]

[0063] R1-OSO3 - HA +

[0064] in,

[0065] R1 is 4,8,12-triproplypentadecane,

[0066] A is triethanolamine.

[0067] After cleaning the cell unit film glass 3, in the step (S5) of completely removing the coating film formed on the surface of the cell unit film glass 3, the cell unit film glass 3 coated with the coating film is immersed in a coating film removing solution to remove the coating film by dissolving.

[0068] The coating film removal solution is an alkaline aqueous solution using potassium hydroxide (KOH), and the temperature of the potassium hydroxide (KOH) is above 25 degrees.

[0069] However, in order to remove the coating film traces existing on the surface of the cell unit film glass 3 due to the adhesion of a part of the coating film, an additional cleaning process may be performed after the coating film is removed.

[0070] In the step (S7) of cleaning and strengthening the surface-repaired chamber unit film glass 3, the cleaning liquid of the surface-repaired chamber unit film glass 3 includes potassium hydroxide (KOH) or sodium hydroxide (NaOH) solution, deionized water (Deionized water) with added surfactant, and the pH of the cleaning liquid is above 10.

[0071] In the step (S7) of strengthening the cell unit film glass 3 after cleaning the surface repaired cell unit film glass 3, a strengthening liquid used for strengthening the cell unit film glass 3 is a potassium nitrate melt.

[0072] The step (S7) of strengthening the cleaning unit film glass 3 after the surface repair is completed includes: the step of preheating the cleaning unit film glass 3 in the range of 200°C to 400°C; the step of immersing the preheated unit film glass 3 in a strengthening liquid maintained at 370°C to 470°C for strengthening; and the step of slowly cooling the unit film glass 3 to room temperature after discharging it from the strengthening liquid.

[0073] The processing method of forming a partially coated UTG of the present invention formed by such steps can reduce production costs in the glass cutting process and post-processing process when manufacturing room unit thin film glass 3 (UTG: Ultra-Thin Glass) suitable for various electronic products.

[0074] Furthermore, in the present invention, when manufacturing the chamber unit film glass 3, the manufacturing cost of the chamber unit film glass 3 is reduced by simplifying the manufacturing process, and when laser cutting the glass and removing the coating, selective chemical treatment is used to remove the heat damaged areas around the cut surface of the glass caused by the laser beam, thereby improving the durability of the processed chamber unit film glass 3.

Claims

1. A method for processing UTG to form a partial coating, characterized in that: The steps include: Step S1 of coating the entire front surface of the original film glass (1) with a coating liquid for preventing contact with chemicals and then drying it to form a coating film; Step S2 of forming a partial coating film (2) on the back of the original film glass (1) in accordance with the shape of the room unit film glass (3) to be cut from the original film glass (1); and In order to cut the coating film formed on the front of the original thin-film glass (1) and the original thin-film glass (1), a laser beam is irradiated to the back of the original thin-film glass (1), and the laser beam is irradiated along a line to be cut (6) which is separated from the outer contour of the partial coating film (2) by a predetermined interval and is formed in the shape of the chamber unit thin-film glass (3), and a step S3 of cutting and separating the chamber unit thin-film glass (3) from the original thin-film glass (1) is performed, The thickness of the original film glass (1) and the room unit film glass (3) is less than 100 μm. The thickness of the coating film formed on a certain surface of the original thin-film glass (1) is less than 30 μm. The to-be-cut line (6) is spaced 1 μm to 100 μm from the outer contour of the partial coating film (2), The coating liquid used to form the front coating film and the rear partial coating film (2) of the original thin-film glass (1) is an acid-resistant coating liquid. The coating liquid is an acrylic acid solution, or a solution having an ultraviolet absorption rate of 10% or more in the ultraviolet wavelength band below 400nm in polyethylene resin, polypropylene resin, polyvinyl chloride resin, or polystyrene resin, and an infrared absorption rate of 1% or less in the infrared wavelength band above 1000nm. The laser beam is a laser beam output from an infrared laser (4). The infrared laser (4) uses nanosecond infrared laser, picosecond infrared laser, or femtosecond infrared laser. The infrared laser (4) outputs a Bessel beam, The wavelength of the infrared laser (4) outputting the Bessel beam is 1020nm to 1040nm, The method further comprises the following steps: a step S4 of performing a selective chemical treatment on the cut chamber unit film glass (3) to repair the laser cut surface of the chamber unit film glass (3) in order to remove the thermally damaged parts and defective parts around the cut surface of the chamber unit film glass (3) generated during the laser cutting process; After cleaning the chamber unit film glass (3), a step S5 of completely removing the coating film formed on the surface of the chamber unit film glass (3); as well as In order to remove defects or flaws on the surface of the room unit thin film glass (3) from which the coating has been completely removed, after cleaning the room unit thin film glass (3) from which the coating has been completely removed, a step S6 of chemically repairing the surface of the room unit thin film glass (3); After cleaning the chamber unit film glass (3) whose surface has been repaired, a strengthening step S7 is performed. In order to remove the thermally damaged parts and defective parts around the cut surface of the room unit thin film glass (3) generated during the laser cutting process, the cut room unit thin film glass (3) is selectively chemically treated, and in step S4 of repairing the laser cut surface of the room unit thin film glass (3), A bevel-shaped cut portion (5) having a bevel shape is formed based on a repair solution at a right-angled corner portion of the cell unit film glass (3) in contact with the coating film formed on the front and rear surfaces of the cell unit film glass (3), The transverse width of the bevel-shaped cutting portion (5) is 3 μm to less than 500 μm, The height of the bevel-shaped cutting portion (5) is greater than 3 μm and does not exceed 50% of the thickness of the unit film glass (3). After cleaning the chamber unit film glass (3), in step S5, all the coating film formed on the surface of the chamber unit film glass (3) is removed. The cell unit film glass (3) coated with the coating film is immersed in a coating film removal solution to remove the coating film by dissolving it. The coating film removal solution is an alkaline aqueous solution using potassium hydroxide, and the temperature of the potassium hydroxide is above 25 degrees. In the step S7 of cleaning the surface-repaired chamber unit film glass (3) and then strengthening it, the cleaning liquid of the surface-repaired chamber unit film glass (3) comprises potassium hydroxide or sodium hydroxide solution, deionized water with added surfactant, and the pH of the cleaning liquid is above 10.

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