CN114845966A - Method for manufacturing glass plate - Google Patents
Method for manufacturing glass plate Download PDFInfo
- Publication number
- CN114845966A CN114845966A CN202180007403.7A CN202180007403A CN114845966A CN 114845966 A CN114845966 A CN 114845966A CN 202180007403 A CN202180007403 A CN 202180007403A CN 114845966 A CN114845966 A CN 114845966A
- Authority
- CN
- China
- Prior art keywords
- cleaning
- glass plate
- glass
- liquid
- glass sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011521 glass Substances 0.000 title claims abstract description 230
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000004140 cleaning Methods 0.000 claims abstract description 293
- 239000007788 liquid Substances 0.000 claims abstract description 127
- 239000011347 resin Substances 0.000 claims abstract description 33
- 229920005989 resin Polymers 0.000 claims abstract description 33
- 230000002378 acidificating effect Effects 0.000 claims abstract description 25
- 238000003860 storage Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 238000005406 washing Methods 0.000 claims description 22
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims description 12
- 150000001261 hydroxy acids Chemical class 0.000 claims description 11
- 150000004679 hydroxides Chemical class 0.000 claims description 4
- 239000000243 solution Substances 0.000 description 33
- 238000012360 testing method Methods 0.000 description 21
- 239000011575 calcium Substances 0.000 description 20
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 17
- 229910052791 calcium Inorganic materials 0.000 description 17
- 238000011179 visual inspection Methods 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 12
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 10
- 229910001424 calcium ion Inorganic materials 0.000 description 10
- 229910052736 halogen Inorganic materials 0.000 description 10
- 150000002367 halogens Chemical class 0.000 description 10
- 239000005416 organic matter Substances 0.000 description 10
- 239000000126 substance Substances 0.000 description 9
- 239000004094 surface-active agent Substances 0.000 description 9
- 238000005286 illumination Methods 0.000 description 8
- 238000007689 inspection Methods 0.000 description 8
- 239000005340 laminated glass Substances 0.000 description 8
- 238000001035 drying Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- -1 polyethylene Polymers 0.000 description 6
- 239000010419 fine particle Substances 0.000 description 5
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- 239000002738 chelating agent Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 239000003599 detergent Substances 0.000 description 4
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 239000003945 anionic surfactant Substances 0.000 description 3
- 150000001450 anions Chemical class 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000012459 cleaning agent Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000002736 nonionic surfactant Substances 0.000 description 3
- 238000007500 overflow downdraw method Methods 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 150000005215 alkyl ethers Chemical class 0.000 description 2
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 2
- 239000002216 antistatic agent Substances 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000005388 borosilicate glass Substances 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 2
- 235000015165 citric acid Nutrition 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000004310 lactic acid Substances 0.000 description 2
- 235000014655 lactic acid Nutrition 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000001630 malic acid Substances 0.000 description 2
- 235000011090 malic acid Nutrition 0.000 description 2
- 239000011859 microparticle Substances 0.000 description 2
- 239000006060 molten glass Substances 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 229960004889 salicylic acid Drugs 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000011975 tartaric acid Substances 0.000 description 2
- 235000002906 tartaric acid Nutrition 0.000 description 2
- 101710178035 Chorismate synthase 2 Proteins 0.000 description 1
- 101710152694 Cysteine synthase 2 Proteins 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000006124 Pilkington process Methods 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 239000005354 aluminosilicate glass Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000005345 chemically strengthened glass Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 150000004715 keto acids Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 235000011181 potassium carbonates Nutrition 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
- 229910000031 sodium sesquicarbonate Inorganic materials 0.000 description 1
- 235000018341 sodium sesquicarbonate Nutrition 0.000 description 1
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- WCTAGTRAWPDFQO-UHFFFAOYSA-K trisodium;hydrogen carbonate;carbonate Chemical compound [Na+].[Na+].[Na+].OC([O-])=O.[O-]C([O-])=O WCTAGTRAWPDFQO-UHFFFAOYSA-K 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B11/00—Cleaning flexible or delicate articles by methods or apparatus specially adapted thereto
- B08B11/04—Cleaning flexible or delicate articles by methods or apparatus specially adapted thereto specially adapted for plate glass, e.g. prior to manufacture of windshields
-
- B08B1/20—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B40/00—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it
- C03B40/02—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it by lubrication; Use of materials as release or lubricating compositions
- C03B40/033—Means for preventing adhesion between glass and glass
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C23/00—Other surface treatment of glass not in the form of fibres or filaments
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C23/00—Other surface treatment of glass not in the form of fibres or filaments
- C03C23/0075—Cleaning of glass
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/10—Salts
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/265—Carboxylic acids or salts thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
A method for manufacturing a glass plate, comprising a storage step for storing the glass plate in contact with a resin sheet and a cleaning step for cleaning the glass plate after the storage step, wherein the cleaning step (S2) of the method for manufacturing a glass plate comprises a first cleaning step (S21) for supplying a first cleaning liquid (CS1) to the glass plate (G) to clean the glass plate (G), and a second cleaning step (S23) for supplying a second cleaning liquid (CS2) to the glass plate (G) after the first cleaning step (S21) to clean the glass plate (G). The first cleaning liquid (CS1) is an acidic cleaning liquid, and the second cleaning liquid (CS2) is an alkaline cleaning liquid.
Description
Technical Field
The present invention relates to a method of making a glass sheet.
Background
In recent years, high definition of a panel display such as a liquid crystal display and an organic EL display has been advanced. Accordingly, a dense electric circuit is formed in a glass plate used as a substrate for a display through a process for manufacturing the display. Therefore, such a glass plate is required to have high cleanness against dust and dirt.
The glass plate manufacturing process includes, for example, an unbundling step of taking out a glass original plate stored on a tray, a cutting step of cutting out a glass plate having a predetermined size from the taken-out glass original plate, an end face processing step of performing end face processing on the glass plate, and a cleaning step of cleaning the end face-processed glass plate. As a method of cleaning a glass plate, there is a method of cleaning a glass plate conveyed in a predetermined direction by a cleaning tool such as a cleaning tray or a cleaning brush (a roller brush) (for example, see patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2017-14060
Disclosure of Invention
Problems to be solved by the invention
The glass original plates supplied to the above-described glass plate manufacturing process are loaded and stored on a tray, and a plurality of glass original plates are sometimes stacked on the tray with a resin sheet interposed therebetween.
In this case, when the tray is stored for a long period of time, calcium dirt and dirt including organic substances may be generated. Further, these stains are firmly attached to the glass plate, and in the cleaning step, it is sometimes difficult to remove these stains from the glass plate.
Accordingly, a technical object of the present invention is to improve a cleaning force in a cleaning process of a glass plate.
Means for solving the problems
The present invention is a method for manufacturing a glass plate, including a storage step of storing a glass plate in contact with a resin sheet and a cleaning step of cleaning the glass plate after the storage step, wherein the cleaning step includes a first cleaning step of supplying a first cleaning liquid to the glass plate to clean the glass plate and a second cleaning step of supplying a second cleaning liquid to the glass plate after the first cleaning step to clean the glass plate, the first cleaning liquid is an acidic cleaning liquid, and the second cleaning liquid is an alkaline cleaning liquid.
According to intensive studies by the present inventors, it was confirmed that when the resin sheet is stored for a long time in a state where the resin sheet is in contact with the glass plate, if the dirt transferred from the resin sheet to the surface of the glass plate contains calcium (hereinafter, referred to as "calcium dirt"), the calcium dirt is less likely to be removed from the glass plate by washing than other dirt.
The present inventors have found that calcium stains and stains including organic matter can be efficiently removed from a glass plate by performing a first cleaning step in which a first cleaning liquid is an acidic cleaning liquid and then performing a second cleaning step in which a second cleaning liquid is an alkaline cleaning liquid.
The acidic cleaning solution may contain a hydroxy acid. Examples of the hydroxy acid (oxo acid) include glycolic acid, lactic acid, tartaric acid, citric acid, malic acid, salicylic acid, and the like. The hydroxy acid is a carboxylic acid having both hydroxyl groups, and has high water solubility. In addition, the hydroxy acid binds to calcium ions (Ca 2) of calcium dirt on the surface of the glass plate by a chelating effect due to carboxyl groups contained in the molecule (Ca 2) + ) Since calcium ions are taken in one molecule or a plurality of molecules and stabilized, the reaction is effective for removing calcium components adhering to the surface of the glass plate.
The alkaline cleaning solution may contain a hydroxide salt, and may contain at least one of sodium hydroxide and potassium hydroxide, for example.
In the first cleaning step, a cleaning tool may be brought into contact with the glass plate to clean the glass plate. This enables the first cleaning step to be performed efficiently.
In the second cleaning step, a cleaning tool may be brought into contact with the glass plate to clean the glass plate. This enables the second cleaning step to be performed efficiently.
The method may include the following liquid removal step: and supplying a removing liquid to the glass plate after the first cleaning step and before the second cleaning step, thereby removing the first cleaning liquid adhering to the glass plate, wherein the removing liquid is warm water. By removing the first cleaning liquid adhering to the glass plate after the first cleaning step in this liquid removing step, the glass plate can be cleaned more efficiently with the second cleaning liquid in the second cleaning step thereafter.
The method may further include the following washing step: and after the second cleaning step, supplying a rinse liquid containing alkaline electrolytic water to the glass plate to remove the second cleaning liquid adhering to the glass plate. By covering the surface of the glass plate with anions in the rinsing step, it is possible to prevent particulate matter dispersed in the rinsing liquid from re-adhering to the surface of the glass plate, and to improve the cleanliness of the surface of the glass plate after the rinsing step.
Effects of the invention
According to the present invention, the cleaning force in the cleaning process of the glass plate can be improved.
Drawings
Fig. 1 is a sectional view showing a method for manufacturing a glass plate according to a first embodiment of the present invention.
Fig. 2 is a sectional view showing the structure of the washing machine in the first washing section and the second washing section.
Fig. 3 is a flowchart showing a cleaning process.
Fig. 4 is a sectional view showing a method for manufacturing a glass plate according to a second embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 to 3 show a first embodiment of the method for producing a glass sheet according to the present invention.
As shown in fig. 1, the method includes a storage step S1 of storing the glass sheet G and a cleaning step S2 of cleaning the glass sheet G. The storage step S1 and the cleaning step S2 may further include the bundling step, the cutting step, and the end face processing step described above. The washing step S2 may be a subsequent step including a step of inspecting the glass sheets G and a step of packing the glass sheets G on a pallet.
In the storage step S1, the glass sheets G are managed in the package body PB. The package body PB is configured by mounting a plurality of glass plates G on the tray P. In the storage step S1 of the present embodiment, the glass sheets G are stored in a flat posture, but the glass sheets G may be stored in an inclined posture.
The glass sheet G is formed by cutting a long glass ribbon formed by, for example, the overflow downdraw method. The overflow downdraw method comprises the following steps: molten glass is poured into an overflow trough provided above a forming body having a substantially wedge-shaped cross section, and the molten glass overflowing from both sides of the overflow trough is fused and integrated at the lower end portion of the forming body while flowing down along the side wall portions on both sides of the forming body, thereby continuously forming a glass ribbon. The glass sheet G is not limited to the overflow down-draw method, and can be produced by the float method and other various forming methods.
The glass plate G is configured in a rectangular shape, but is not limited to this shape. The glass plate G includes a first main surface Ga and a second main surface Gb. In the present embodiment, the first main surface Ga is a guaranteed surface, and the second main surface Gb is a non-guaranteed surface. Here, the term "guaranteed surface" means a surface on the side to which a film forming process such as a transparent conductive film is applied in a manufacturing process of a display, for example.
The glass plate G is preferably made of, for example, silicate glass or silica glass, and is preferably made of borosilicate glass, soda-lime glass, aluminosilicate glass, chemically strengthened glass, or alkali-free glass. Here, the alkali-free glass means glass substantially free of alkali components (alkali metal oxides), specifically glass having an alkali component weight ratio of 3000ppm or less. The weight ratio of the alkali component in the present invention is preferably 1000ppm or less, more preferably 500ppm or less, and most preferably 300ppm or less.
The resin sheet RS is stacked on each glass plate G. The resin sheet RS prevents the glass plates G from contacting each other in the package body PB.
The resin sheet RS is a rectangular sheet having a larger surface area than the glass plate G. The resin sheet RS is made of, for example, a foamed resin sheet using a resin mainly composed of polyethylene, a resin protective film, or the like. The resin sheet RS may contain an antistatic agent such as a polymer type antistatic agent, or a surfactant such as an anionic surfactant or a nonionic surfactant.
In the storage step S1, the package body PB is stored for example for several days to one year. The longer the storage period, the more the scale of the glass sheet G increases, and the more remarkable the effect of improving the cleaning power of the present invention. Therefore, the storage period is preferably two months or more, and more preferably four months or more. The package body PB having passed through the storage step S1 is transported out of the storage space SS.
The glass plate G taken out of the package body PB is supplied to the cleaning step S2. In this case, the resin sheet RS is peeled off from the glass plate G. In the cleaning step S2, the glass sheet G is cleaned by the cleaning apparatus 1 shown in fig. 1.
The cleaning device 1 mainly includes: a first cleaning unit 2 for cleaning the glass sheet G while supplying a first cleaning liquid CS1 to the glass sheet G; a liquid removing unit 3 for removing the first cleaning liquid CS1 adhering to the glass sheet G; a second cleaning unit 4 for cleaning the glass sheet G while supplying a second cleaning liquid CS2 to the glass sheet G; a washing unit 5 for removing the second cleaning liquid CS2 adhering to the glass sheet G while supplying the washing liquid to the glass sheet G; and a drying section 6. The cleaning apparatus 1 further includes a conveying device 7 for conveying the glass sheet G in a predetermined conveying direction X.
The first cleaning unit 2 includes an upper cleaning machine 2a for cleaning the first main surface Ga of the glass plate G and a lower cleaning machine 2b for cleaning the second main surface Gb of the glass plate G.
The upper cleaning machine 2a includes an upper cleaning tool 8a in contact with the first main surface Ga and a main body 9a supporting the upper cleaning tool 8 a. The lower cleaning machine 2b includes a lower cleaning tool 8b that contacts the second main surface Gb, and a main body 9b that supports the lower cleaning tool 8 b. The upper side washer 2a is of the same type as the lower side washer 2 b.
Hereinafter, the structure of each of the washing machines 2a and 2b will be described by taking the upper washing machine 2a shown in fig. 2 as an example. The upper cleaning implement 8a is formed in a disk shape, but is not limited to this shape. The upper cleaning tool 8a includes a cleaning member 10 that contacts the first main surface Ga of the glass sheet G, and a shaft portion 11 that supports the cleaning member 10.
The cleaning member 10 is formed in a disc shape (disc shape) from, for example, a foamed resin molded body, a foamed rubber molded body (foamed sponge), or a fiber molded body in a felt shape (felt sponge). The structure is not limited to this, and the cleaning member 10 may be constituted by a brush.
The cleaning member 10 has a supply hole 12 for supplying the first cleaning liquid CS1 to the glass sheet G. The shaft portion 11 is tubular and allows the first cleaning liquid CS1 to pass therethrough. The shaft portion 11 communicates with the supply hole 12 of the cleaning member 10.
The main body 9a includes a reservoir 13 for storing the first cleaning liquid CS1, a bearing 14 for rotatably supporting the shaft 11 of the first cleaning device, and a driving unit (not shown) for rotating the shaft 11.
The storage tank 13 stores an acidic cleaning solution as the first cleaning solution CS 1. The acidic cleaning solution is for example constituted by an aqueous solution containing a hydroxy acid. Examples of the hydroxy acid include glycolic acid, lactic acid, tartaric acid, citric acid, malic acid, salicylic acid, and the like. The hydroxy acid is a carboxylic acid having both hydroxyl groups, and has high water solubility. The hydroxy acid is effective in removing the calcium component adhering to the main surfaces Ga and Gb of the glass sheet G because the carboxyl group contained in the molecule reacts with the calcium ion (Ca2+) of the calcium dirt on the surface (main surfaces Ga and Gb) of the glass sheet G by a chelating effect, and the calcium ion is taken in one molecule or a plurality of molecules and stabilized. For example, when glycolic acid is used as the acidic cleaning solution, the concentration thereof is preferably 1.5 to 10%, but the concentration is not limited to this range. It is noted that the acidic cleaning solution may contain one or more hydroxy acids.
The first cleaning liquid CS1 may contain a surfactant for cleaning and removing dirt containing organic substances on the glass sheet G. The surfactant may be selected from the group consisting of anionic surfactants represented by sodium alkylbenzenesulfonate and nonionic surfactants represented by polyoxyethylene alkyl ether. The surfactant is effective for taking in and removing the organic matter-based dirt transferred from the resin sheet RS to the dirt on the main surfaces Ga and Gb of the glass plate G.
The acidic cleaning solution is prepared by adding an acidic cleaning solution to the acidic cleaning solution to prevent calcium ions (Ca 2) from being released from the acidic cleaning solution + ) The reattachment of the Ga and Gb to the main surfaces of the glass sheet G may further include a chelating agent that preferentially complements the calcium ions. As the chelating agent to be added, sodium tripolyphosphate, EDTA (ethylenediaminetetraacetic acid), NTA (nitrilotriacetic acid), sodium citrate, various organic polymer chelating agents, and inorganic substances such as zeolite, which selectively adsorb calcium ions, may be used.
The storage tank 13 may be provided with a heater for heating the first cleaning liquid CS 1. In this case, the temperature of the first cleaning liquid CS1 is preferably 40 to 50 ℃, but is not limited to this range.
The first cleaning unit 2 can perform wiping cleaning of the glass sheet G by rotating the shaft portion 11 by the driving unit in a state where the cleaning tools 8a and 8b are brought into contact with the main surfaces Ga and Gb of the glass sheet G.
The liquid removing unit 3 is used to remove the first cleaning liquid CS1 adhering to the glass sheet G that has passed through the first cleaning unit 2. The liquid removing unit 3 includes an upper air knife 3a and a lower air knife 3 b. The liquid removing unit 3 can remove the first cleaning liquid CS1 from the glass sheet G by blowing air from the air knives 3a and 3b toward the main surfaces Ga and Gb of the glass sheet G.
The second cleaning unit 4 includes an upper cleaning machine 4a and a lower cleaning machine 4b capable of wiping and cleaning the glass sheet G. The upper cleaning machine 4a includes an upper cleaning implement 15a and a main body 16a supporting the upper cleaning implement 15 a. The lower cleaning machine 4b includes a lower cleaning implement 15b and a main body 16b supporting the lower cleaning implement 15 b. The upper washer 4a and the lower washer 4b of the second cleaning unit 4 have the same configurations as the upper washer 2a and the lower washer 2b of the first cleaning unit 2.
However, the second cleaning unit 4 is different from the first cleaning unit 2 in that an alkaline cleaning liquid is used as the second cleaning liquid CS 2. The alkaline cleaning liquid contains a hydroxide salt, and is composed of an aqueous solution containing at least one of sodium hydroxide and potassium hydroxide, for example. The total concentration of sodium hydroxide and potassium hydroxide in the alkaline cleaning solution is preferably 0.5 to 10%, more preferably 1.5 to 10%. The second cleaning liquid CS2 may contain a surfactant or a chelating agent. The temperature of the second cleaning liquid CS2 is preferably 40 to 50 ℃, but is not limited to this range.
The alkaline cleaning liquid is not limited to the hydroxide salt, and may contain carbonate. As the carbonate, sodium carbonate, potassium carbonate, sodium sesquicarbonate, sodium bicarbonate (sodium bicarbonate), or the like can be used. The alkaline cleaning liquid is not limited to the above, and may contain an alkaline auxiliary cleaning agent such as silicate.
By the above-described alkaline cleaning liquid, other stains containing organic matters can be more effectively removed from the glass sheet G. Moreover, by alkalifying the main surfaces Ga and Gb of the glass sheet G and holding negative charges, the highly polar surfactant components adsorbed and remaining on the main surfaces Ga and Gb of the glass sheet G can be removed particularly effectively after the first cleaning liquid CS1 (acid cleaning agent) is used.
The alkaline cleaning solution may contain a surfactant component for effectively removing dirt containing organic matter on the glass sheet G and the residue of the acidic cleaning agent. The surfactant may be selected from the group consisting of anionic surfactants represented by sodium alkylbenzenesulfonate and nonionic surfactants represented by polyoxyethylene alkyl ether. The surfactant is effective for taking in the organic material remains on the main surfaces Ga and Gb of the glass plate G and removing the organic material from the main surfaces Ga and Gb of the glass plate G.
More preferably, the alkaline cleaning liquid may contain the same chelating auxiliary agent as the first cleaning liquid CS1 in order to prevent calcium ions removed from the glass sheet G and released in the alkaline cleaning liquid from adhering to the main surfaces Ga and Gb of the glass sheet G again.
The washing section 5 is used to remove the second cleaning liquid CS2 adhering to the glass sheet G that has passed through the second cleaning section 4. The rinse unit 5 includes an upper rinse liquid supply unit 5a and a lower rinse liquid supply unit 5 b. The upper rinse liquid supply unit 5a supplies the rinse liquid to the first main surface Ga of the glass sheet G. The lower rinse liquid supply unit 5b supplies the rinse liquid to the second main surface Gb of the glass plate G.
For example, pure water is used as the rinse liquid, but the rinse liquid is not limited thereto. For example, pure water containing alkaline electrolytic water having a pH of about 11, which is formed by electrolysis from a small-concentration potassium carbonate aqueous solution, may be used as the rinse liquid. Accordingly, the main surfaces Ga and Gb of the glass sheet G are negatively charged (covered with anions), and calcium ions, organic substances, microparticles, and the like dispersed in the discharged liquid are negatively charged to have a repulsive effect, so that reattachment of foreign matter to the main surfaces Ga and Gb of the glass sheet G after cleaning can be prevented, and the glass sheet G is effective particularly in reducing fine microparticles that are not visible in an appearance inspection. When pure water containing alkaline electrolyzed water is used, the pH of the pure water containing alkaline electrolyzed water is, for example, 9 to 12.
The washing unit 5 includes a spray-like nozzle, and can remove the second washing liquid CS from the glass sheet G by spraying a high-pressure washing liquid to wash. The washing unit 5 may remove the second cleaning liquid CS2 from the glass sheet G by spraying a washing liquid obtained by mixing air into pure water through a mixing nozzle. The washing unit 5 may remove the second cleaning liquid CS from the glass plate G using a cleaning tool.
The drying unit 6 is used to remove the rinse solution adhering to the glass sheet G having passed through the rinsing unit 5. The drying section 6 includes an upper air knife 6a and a lower air knife 6 b. The upper air knife 6a blows air toward the first main surface Ga of the glass sheet G having passed through the washing section 5. The lower air knife 6b blows air toward the second main surface Gb of the glass sheet G.
The conveying device 7 conveys the glass sheet G from the first washing unit 2 to the drying unit 6. The conveying device 7 is constituted by, for example, a roller conveyor, but is not limited to this configuration. The conveying device 7 includes a plurality of conveying rollers 7a arranged at predetermined intervals. The conveying rollers 7a are rotationally driven while being in contact with the second main surface Gb of the glass sheet G, and convey the glass sheet G in the conveying direction X.
As shown in fig. 3, the cleaning step S2 includes a first cleaning step S21, a liquid removing step S22, a second cleaning step S23, a rinsing step S24, and a drying step S25.
In the first cleaning step S21, in the first cleaning section 2, the upper cleaning tool 8a and the lower cleaning tool 8b of the first cleaning section 2 are brought into contact with the first main surface Ga and the second main surface Gb of the glass sheet G while the glass sheet G is conveyed in the conveying direction X by the conveying device 7. Thereby, the glass plate G is held between the cleaning tools 8a and 8 b. Each of the cleaning tools 8a and 8b rotates the cleaning member 10 while supplying an acidic cleaning liquid CS1 as the first cleaning liquid to each of the main surfaces Ga and Gb of the glass sheet G. Thereby, the first main surface Ga and the second main surface Gb of the glass plate G are cleaned simultaneously.
In the liquid removing step S22, the first cleaning liquid CS1 adhering to the first main surface Ga and the second main surface Gb of the glass sheet G is removed by blowing air from the air knives 3a and 3b of the liquid removing unit 3 toward the glass sheet G having passed through the first cleaning unit 2.
In the second cleaning step S23, the upper cleaning tool 15a and the lower cleaning tool 15b of the second cleaning unit 4 are brought into contact with the first main surface Ga and the second main surface Gb of the glass sheet G while the glass sheet G is conveyed in the conveying direction X in the second cleaning unit 4. The cleaning tools 15a and 15b rotate the cleaning member 10 while supplying the alkaline cleaning liquid CS2 as the second cleaning liquid to the main surfaces Ga and Gb of the glass sheet G. Thereby, the first main surface Ga and the second main surface Gb of the glass sheet G are simultaneously cleaned.
In the rinsing step S24, the glass sheet G having passed through the second cleaning unit 4 is supplied with the rinse liquid from the rinse liquid supply units 5a and 5b of the rinse unit 5. This allows the second cleaning liquid CS2 adhering to the first main surface Ga and the second main surface Gb of the glass sheet G to be removed.
In the drying step S25, air is blown from the air knives 6a and 6b of the drying section 6 to the glass sheet G having passed through the washing section 5. In this case, it is desirable to eject air of high pressure toward the glass sheet G from the air knives 6a, 6b, for example. This enables the rinse solution adhering to the glass plate G to be removed.
According to the method of manufacturing the glass plate G of the present embodiment, the calcium contaminants transferred from the resin sheet RS to the glass plate G in the storage step S1 can be effectively removed by the first cleaning step S21. In addition, in the second cleaning step S23, dirt including organic matter can be effectively removed. This can improve the cleaning force in the cleaning step S2 of the glass sheet G. Here, it is assumed that calcium scale is generated by precipitation, concentration, and adhesion of a trace amount of calcium contained in the moisture in the atmosphere to the glass in a process in which the additive (for example, polyethylene glycol, or a copolymer of polyethylene glycol and polypropylene) contained in the resin sheet RS absorbs the moisture in the atmosphere. It is also assumed that the dirt containing organic substances is generated by bleeding of various additives (for example, a sparse aqueous substance) contained in the resin sheet RS.
Fig. 4 shows a second embodiment of the method for producing a glass sheet of the present invention. In the present embodiment, the configuration of the liquid removing step S22 is different from that of the first embodiment. In the first embodiment, the liquid removing unit 3 of the cleaning apparatus 1 is constituted by an air knife, but the liquid removing unit 3 of the present embodiment is constituted by a shower cleaning apparatus that supplies a removing liquid for removing the first cleaning liquid CS1 adhering to the glass sheet G.
The liquid removing unit 3 includes an upper removing liquid supply unit 17a and a lower removing liquid supply unit 17 b. The upper removing liquid supplying portion 17a supplies the removing liquid to the first main surface Ga of the glass sheet G. The lower removing liquid supplying section 17b supplies the removing liquid to the second main surface Gb of the glass sheet G.
The removing liquid supplied to the glass plate G is, for example, pure water. The removal liquid is preferably supplied to the glass plate G in a heated state of warm water. The temperature of the removing solution is preferably 40 to 60 ℃, for example, but is not limited to this range.
The removal solution may also contain alkaline electrolyzed water. By using alkaline electrolytic water in the removing solution, the main surfaces Ga and Gb of the glass plate G are covered with anions, and the particulate matter removed from the glass plate G and dispersed in the removing solution is prevented from adhering to the main surfaces Ga and Gb of the glass plate G again. This improves the cleanliness of the main surfaces Ga and Gb of the glass sheet G after the first cleaning step S21.
The present invention is not limited to the configurations of the above embodiments, and is not limited to the above operational effects. The present invention can be variously modified within a scope not departing from the gist of the present invention.
In the above-described embodiment, the method for producing the glass sheet G including the liquid removing step S22 between the first cleaning step S21 and the second cleaning step S23 is illustrated, but the present invention is not limited to this configuration. In the present invention, for example, the liquid removal step S22 may be omitted.
In the above-described embodiments, disk-shaped (disk-shaped) cleaning devices are exemplified as the cleaning devices 8a, 8b, 15a, and 15b, but the present invention is not limited to this configuration. The cleaning device may be a cleaning roller or other cleaning device.
The present invention may further include a liquid removing step of removing the second cleaning liquid CS2 (alkaline cleaning liquid) attached to the glass plate G in the second cleaning step S23 between the second cleaning step S23 and the rinsing step S24.
Examples
Hereinafter, examples of the present invention will be described, but the present invention is not limited to these examples. The present inventors conducted tests for confirming the quality of glass sheets produced by the present invention. The test was conducted by both the first method and the second method as described in detail below.
In the test according to the first method, a cleaned and dried test soda glass plate and a resin sheet having a rectangular shape were used. The size of the glass plate was 100mm × 100mm, and the thickness was 0.7 mm. The size of the resin sheet was 150mm × 150 mm. After the resin sheet was stored in contact with the glass plate for three months, the resin sheet was removed from the glass plate, and test pieces of the glass plate were produced, in which calcium dirt and dirt including organic substances were formed on the surface (examples 1 to 5 and comparative example 1).
In the experiment, the glass plate of examples 1 to 5 was cleaned with an acidic cleaning solution (first cleaning solution), and then cleaned with an alkaline cleaning solution (second cleaning solution). In this case, the glass plates of examples 1 to 5 were cleaned while varying the concentrations of the acidic cleaning liquid and the alkaline cleaning liquid. Further, the glass plate of comparative example 1 was cleaned with an alkaline cleaning liquid (first cleaning liquid), and then the glass plate of comparative example 1 was cleaned with an acidic cleaning liquid (second cleaning liquid).
Specifically, the cleaning liquid was sprayed at a predetermined concentration by a shower, and a glass plate was wiped with the cleaning liquid impregnated with a polyvinyl alcohol (PVA) sponge for 30 seconds, and then washed with pure water manually and dried with dry air.
The inventors evaluated the cleaning results of the glass plates of examples 1 to 5 and comparative example 1. The evaluation of the cleaning results was performed by the following inspection (visual inspection): the presence or absence of dirt on the surface of the glass plate was visually confirmed by utilizing reflection and transmission of light with respect to the surface of the glass plate when the illumination using a fluorescent lamp was 1500 lux. In addition to this, the evaluation of the cleaning results was also performed as follows: the light reflected from the surface of the glass plate was visually inspected by utilizing the reflection of light from illumination with 10000 lux using halogen illumination of higher intensity. The evaluation results were evaluated on three scales of ≈ good, Δ (normal), and × (not-possible).
The evaluation of ∘ (good) in table 1 shows that under the conditions in which the illuminance of the fluorescent lamp was 1500 lux and the illuminance of the halogen illumination was 10000 lux in the visual inspection, a clean and transparent glass plate in which no dot-like or linear surface foreign matter or translucent spots due to the remaining of the detergent were observed was obtained.
The evaluation of Δ (normal) in table 1 indicates that no surface foreign matter was observed under the condition of 1500 lux of illumination intensity of fluorescent lamp, but translucent spots, which are considered to be film-like residue of exuded foreign matter or detergent components, were observed by visual inspection under the condition of 10000 lux of illumination intensity of halogen illumination, with fine foreign matter remaining.
On the other hand, the evaluation of × (impossible) in table 1 was determined when the residual foreign matter and translucent spots were observed by visual inspection using an illumination of 1500 lux from a fluorescent lamp.
The test results are shown in table 1. The concentration of the acidic cleaning solution indicates the concentration (mass%) of glycolic acid, and the concentration of the alkaline cleaning solution indicates the total concentration (mass%) of sodium hydroxide and potassium hydroxide. In the alkaline cleaning solution, the concentrations (mass%) of sodium hydroxide and potassium hydroxide were the same.
[ Table 1]
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | |
| Class of first cleaning liquid | Acidity | Acidity | Acidity | Acidity | Acidity | Basic property |
| Concentration of first cleaning solution (%) | 5 | 2 | 2 | 5 | 2 | 5 |
| Class of second cleaning liquid | Basic property | Basic property | Basic property | Basic property | Basic property | Acidity |
| Concentration of second cleaning solution (%) | 5 | 2 | 1 | 2 | 5 | 5 |
| Fluorescent lamp inspection | No foreign matter | No foreign matter | No foreign matter | Without foreign matter | No foreign matter | With foreign matter |
| Halogen lamp inspection | No foreign matter | Without foreign matter | With micro foreign matter | Residual white spot | No foreign matter | With foreign matter |
| Cleaning results | ○ | ○ | △ | △ | ○ | × |
As shown in Table 1, examples 1 to 5 were judged to have good cleaning results and to be normal. In examples 3 and 4, although no stain was observed in the visual inspection of the fluorescent lamp, some fine foreign matters considered to be insufficient cleaning and white and opaque thin spots considered to be caused by the remaining of the acidic detergent or the remaining of the film-like foreign matters were observed in the visual inspection using the strong illuminance of the halogen lamp.
On the other hand, in comparative example 1, it was determined that the stains containing organic matter could not be sufficiently removed from the glass plate, and the cleaning was defective.
Here, on the surface of the glass plate, a calcium stain is often attached after a stain containing organic matter is observed along with the exudation. Therefore, a part or all of the surface of the dirt containing organic substances is often covered with calcium dirt. Therefore, as in the comparative example, when cleaning is performed with an alkaline cleaning liquid (first cleaning liquid) and then cleaning is performed with an acidic cleaning liquid (second cleaning liquid), exposed portions of the surface of dirt including organic matter are removed during cleaning with the alkaline cleaning liquid, and calcium dirt tends to be removed during cleaning with the acidic cleaning liquid. As a result, it was estimated that the non-exposed portion of the surface of the organic matter-containing dirt tended to remain, and the organic matter-containing dirt could not be sufficiently removed from the glass plate. From the test results, it was confirmed that the cleaning force was improved by cleaning the glass plate with an alkaline cleaning solution after cleaning the glass plate with an acidic cleaning solution.
In the second method test, a rectangular glass plate or a polyethylene foamed resin sheet cleaned and dried by a predetermined method was used. The glass plate had a size of 370mm by 470mm and a thickness of 0.5 mm. The glass plate was an alkali-free borosilicate glass plate (material: OA-11, manufactured by Nippon Denshoku Co., Ltd.) for a liquid crystal display. The size of the resin sheet was 400mm × 500mm, and the thickness was 0.085 mm.
A glass laminate was formed by stacking a polyethylene foamed resin sheet on a glass plate. The glass laminate is a combination of one glass plate and one resin sheet as one set, and a plurality of sets of glass laminates are laminated in a horizontal posture. The plurality of sets of glass laminates are reproduced assuming a storage state in which the glass laminates are loaded on a tray for conveyance.
The glass laminate was placed in a constant temperature and humidity tester, and an accelerated environmental test was performed in which the temperature and humidity in the tester were changed. The accelerated environmental test will be described in detail below.
In this test, a first step and a second step, which differ in temperature and humidity, were repeatedly performed. Specifically, the combination of the first step and the second step is regarded as one cycle, and the cycle is repeated 180 times.
In the first step, the inside of the test machine is set to a high temperature and high humidity. The set temperature in the testing machine in the first step was 50 ℃ and the set humidity was 70%. In the second step, the inside of the testing machine is set to be at normal temperature and normal humidity. The set temperature in the testing machine in the second step was 25 ℃ and the set humidity was 50%.
The cycle of the first step and the second step is set as follows. First, the temperature and humidity of the first step were maintained for 1 hour. After that, it took 1 hour to lower the temperature and humidity in the test machine to the conditions of the second step. Then, the temperature and humidity of the second step were maintained for 1 hour. After that, it took 1 hour to raise the temperature and humidity in the test machine to the conditions of the first step. The above-described maintenance, decrease, and increase of the temperature and humidity are one cycle. This single cycle reproduces changes in the temperature and humidity of the ambient environment in a short time when the glass laminate is stored for one day. In this test, the state in which the glass laminate was stored for 180 days was assumed to be reproduced by repeating 180 cycles.
By the accelerated environmental test as described above, the components of the resin sheet were transferred to the glass plate to contaminate the glass plate. Thereafter, the resin sheet was removed from the glass plate, and a test piece of the glass plate in which calcium dirt and dirt including organic substances were formed on the surface was produced (examples 6 to 10, comparative example 2).
The cleaning of the glass plate in the second method is performed by the cleaning apparatus 1 of the first embodiment described above. In the cleaning of the glass plate by the cleaning apparatus 1, cleaning conditions 1 using pure water not containing alkaline electrolytic water and cleaning conditions 2 using pure water containing alkaline electrolytic water are set as the rinse liquid in the rinsing step.
As in the first method described above, the cleaning results were evaluated by visual inspection of the surface of a glass plate using a fluorescent lamp with an illuminance of 1500 lux and visual inspection of the surface of a glass plate using a halogen lamp with an illuminance of 10000 lux. In examples 6 to 10 and comparative example 2, 5 glass plates were each examined and evaluated on three scales of good, fair, and poor.
In the second method, the number of fine foreign matters (fine particles) having a particle size of 1 μm or more on the surface of the cleaned glass plate was measured by using Hitachi Seisakusho K.K. fine particle measuring apparatus GI 7200. In examples 6 to 10 and comparative example 2, each glass plate was measured, and the results were compared. Note that, regarding the number of particlesThe number of the probes detected in 370 mm. times.470 mm was converted to 1m 2 (1000 mm. times.1000 mm) in terms of the number of the cells.
The test results are shown in table 2. The concentration of the acidic cleaning solution indicates the concentration (mass%) of glycolic acid, and the concentration of the alkaline cleaning solution indicates the total concentration (mass%) of sodium hydroxide and potassium hydroxide. In the alkaline cleaning solution, the concentrations (mass%) of sodium hydroxide and potassium hydroxide were the same. In the results of the fluorescent lamp inspection and the halogen inspection in table 2, there was no significant difference between the glass plate after cleaning under cleaning condition 1 and the glass plate after cleaning under cleaning condition 2, and thus the glass plate after cleaning under cleaning condition 1 was shown.
[ Table 2]
As shown in Table 2, the cleaning results were judged to be good and normal in examples 6 to 10. In examples 7 and 8, the number of fine particles was 100 to 200 particles/m in both of the fluorescent lamp inspection and the halogen inspection 2 This is so small that it is good.
In examples 6 and 10, although no stain was observed in the visual inspection of the fluorescent lamp, white and extremely thin spots, which are considered to be caused by the remaining of the detergent component, were observed in the visual inspection of the halogen lamp, and the number of fine particles was 500 to 1000 particles/m 2 Such high numbers.
In example 9, although no fouling was observed in the visual inspection of the fluorescent lamp, minute foreign matter considered to be insufficient cleaning was observed in the visual inspection of the halogen lamp, and the number of fine particles was 700 particles/m 2 This is high. In addition, it was confirmed that in the rinsing step, in cleaning condition 2 using pure water containing alkaline electrolytic water, the number of particles was reduced in examples 6 to 10 as compared with cleaning condition 1 using pure water not containing alkaline electrolytic water, and the effect of preventing reattachment of foreign matter was exhibited.
On the other hand, in comparative example 2, judgment was madeThe dirt containing organic matter is not sufficiently removed from the glass plate, and the cleaning is defective. The number of particles was also 10000 particles/m 2 As described above, in the visual inspection, a deposition mark (streak-like unevenness) was observed due to the irregular residual of foreign matter due to the unevenness of the surface of the foamed resin sheet on the glass plate, and thus comparative example 2 was a defect.
Description of the reference numerals
8a upper side cleaning tool
8b lower side cleaning tool
15a upper side cleaning device
15b lower side cleaning tool
CS1 first cleaning liquid
CS2 second cleaning liquid
G glass plate
RS resin sheet
S1 storage step
S2 cleaning step
S21 first cleaning Process
S22 liquid removing process
S23 second cleaning step
And S24 a washing process.
Claims (9)
1. A method for manufacturing a glass plate, comprising a storage step of storing the glass plate in contact with a resin sheet and a cleaning step of cleaning the glass plate after the storage step,
the method for manufacturing a glass sheet is characterized in that,
the cleaning step includes a first cleaning step of supplying a first cleaning liquid to the glass plate to clean the glass plate and a second cleaning step of supplying a second cleaning liquid to the glass plate after the first cleaning step to clean the glass plate,
the first cleaning solution is an acidic cleaning solution, and the second cleaning solution is an alkaline cleaning solution.
2. The method for producing glass sheet according to claim 1,
the acidic cleaning solution comprises a hydroxy acid.
3. The method for manufacturing glass plate according to claim 2,
the hydroxy acid comprises glycolic acid.
4. The method for producing glass sheet according to any one of claims 1 to 3,
the alkaline cleaning solution contains hydroxide salt.
5. The method for producing glass sheet according to any one of claims 1 to 4,
the alkaline cleaning solution contains at least one of sodium hydroxide and potassium hydroxide.
6. The method for producing glass sheet according to any one of claims 1 to 5,
in the first cleaning step, a cleaning tool is brought into contact with the glass plate to clean the glass plate.
7. The method for producing glass sheet according to any one of claims 1 to 6,
in the second cleaning step, a cleaning tool is brought into contact with the glass plate to clean the glass plate.
8. The method for producing glass sheet according to any one of claims 1 to 7,
the manufacturing method of the glass plate comprises the following liquid removing procedures: supplying a removing liquid to the glass plate after the first cleaning step and before the second cleaning step to remove the first cleaning liquid adhering to the glass plate,
the removal liquid is warm water.
9. The method for producing glass sheet according to any one of claims 1 to 8,
the method for manufacturing the glass plate comprises the following washing procedures: supplying a rinse solution to the glass plate after the second cleaning step to remove the second cleaning solution adhering to the glass plate,
the rinse solution comprises alkaline electrolyzed water.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020054571 | 2020-03-25 | ||
| JP2020-054571 | 2020-03-25 | ||
| PCT/JP2021/011543 WO2021193477A1 (en) | 2020-03-25 | 2021-03-19 | Glass sheet manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114845966A true CN114845966A (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202180007403.7A Pending CN114845966A (en) | 2020-03-25 | 2021-03-19 | Method for manufacturing glass plate |
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| Country | Link |
|---|---|
| JP (1) | JPWO2021193477A1 (en) |
| KR (1) | KR20220157931A (en) |
| CN (1) | CN114845966A (en) |
| TW (1) | TW202138072A (en) |
| WO (1) | WO2021193477A1 (en) |
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| JP2017100933A (en) * | 2015-11-20 | 2017-06-08 | 旭硝子株式会社 | Glass substrate and glass plate packaging body |
| WO2019045449A1 (en) * | 2017-08-29 | 2019-03-07 | Corning Incorporated | Cleaning composition for cleaning glass article and method of cleaning glass substrate using the same |
Also Published As
| Publication number | Publication date |
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| KR20220157931A (en) | 2022-11-29 |
| TW202138072A (en) | 2021-10-16 |
| WO2021193477A1 (en) | 2021-09-30 |
| JPWO2021193477A1 (en) | 2021-09-30 |
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