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1. 发明专利

JP2000007347A VACUUM DEFOAMING OF MOLTEN GLASS 失效
公开(公告)号：JP2000007347A
公开(公告)日：2000-01-11
申请号：JP18039498
申请日：1998-06-26
申请人： ASAHI GLASS CO LTD
发明人： TAKEI YUSUKE , MATSUWAKI MASATAKA , SASAKI MICHITO , KIJIMA SHUN , TANIGAKI JUNJI
IPC分类号： B01D19/00 , C03B5/18 , C03B5/225 , C03C1/00
摘要： PROBLEM TO BE SOLVED: To provide a method for the vacuum deforming of molten glass intended to improve defoaming efficiency and, in its turn, miniaturize a relevant defoaming unit through feeding the surface of a foam layer formed on molten glass with at least one metal compound among 10 such compounds including Al compound from the outside of a reduced pressure defoaming tank. SOLUTION: This method for the vacuum defoaming of molten glass comprises feeding the molten glass with metal compound(s) from a feeder 36 mounted on a reduced pressure deforming tank 14; wherein the metal compound(s) to be used is such one as to contain at least one metal selected from the group consisting of Al, Ti, Si, Zn, Mg, Fe, Cr, Co, Ce and Ca; among others, an organometallic compound is preferably used since the form of metal oxide particles as fine as possible has greater defoaming effect when the metal oxide reaches a foam layer being e.g. tetra-n-butyl titanate as an organotitanium compound; the feeder 36 is pref. of such type as to directly drip or spray metal compound(s) in the form of a solution, slurry, powder or gas.

2. 发明专利

JPH08208266A ULTRAVIOLET RAY ABSORBING GREEN GLASS 失效
公开(公告)号：JPH08208266A
公开(公告)日：1996-08-13
申请号：JP27931195
申请日：1995-10-26
申请人： ASAHI GLASS CO LTD
发明人： KIJIMA SHUN , KUDO TORU , ITOU MIZUKI
IPC分类号： C03C3/095 , C03C4/02 , C03C4/08
摘要： PURPOSE: To reduce the solar radiation transmittance and improve ultraviolet light absorption performances by specifying the visible light transmittance with a light source A, ultraviolet light transmittance and light transmittance at 370nm wavelength. CONSTITUTION: This ultraviolet ray absorbing green glass is obtained by heating and melting 65-75wt.% SiO2 , 0.1-5wt.% Al2 O3 , 10-18wt.% total amount of Na2 O and K2 O, 5-15wt.% CaO, 1-6wt.% MgO, 0.05-1wt.% SO3 , 0.52-0.63wt.% total iron expressed in terms of Fe2 O3 , 0.9-2wt.% total ceerium expressed in terms of CeO2 , 0.2-0.6wt.% TiO2 and 0-0.002wt.% CoO, vitrifying the resultant mixture and then casting the vitrified mixture onto a substrate. The prepared glass comprises soda-lime glass having 28-38wt.% bivalent iron expressed in terms of Fe2 O3 in the total iron expressed in terms of the Fe2 O3 , >=70% visible light transmittance with a light source A,

3. 发明专利

JPH08157232A DARK-GRAY GLASS 失效
公开(公告)号：JPH08157232A
公开(公告)日：1996-06-18
申请号：JP25523295
申请日：1995-10-02
申请人： ASAHI GLASS CO LTD
发明人： ITOU MIZUKI , KIJIMA SHUN
IPC分类号： C03C1/10 , C03C3/087 , C03C4/02
摘要： PURPOSE: To obtain dark-gray glass having low visible light transmissivity, considerably reduced solar radiation transmissivity and UV transmissivity, capable of melting in an ordinary melting vessel and capable of production by a floating method. CONSTITUTION: This dark-gray glass contains 100 parts mother compsn. consisting of, by weight, 65-75% SiO2 , 0.1-5.0% Al2 O3 , 10-18% Na2 O+K2 O, 5-15% CaO, 1-6% MgO and 0.05-1.0% SO3 , 0.8-1.4 parts (expressed in terms of Fe2 O3 ) total iron,

4. 发明专利

JPS63160013A PRODUCTION OF SUBSTRATE FOR MAGNETIC DISK 失效
公开(公告)号：JPS63160013A
公开(公告)日：1988-07-02
申请号：JP30542186
申请日：1986-12-23
申请人： ASAHI GLASS CO LTD
发明人： KOBAYASHI TAKAYUKI , TAKAKUSA TOSHIHARU , KIJIMA SHUN , OGATA HIROSHI
IPC分类号： G11B5/82 , G11B5/73 , G11B5/84
摘要： PURPOSE:To improve a CSS characteristic and head stick characteristic by bringing a glass stock sheet into contact with the vapor of hydrofluoric acid, then subjecting the sheet to a chemical treatment using an aq. soln. contg. potassium fluoride and hydrofluoric acid, thereby providing ruggedness on the surface. CONSTITUTION:The glass disk stock sheet is cleaned by a neutral detergent, is rinsed with ion exchange water and is then dried. Such stock sheet is brought into contact with the hydrofluoric acid vapor atmosphere on the liquid surface of an aq. hydrofluoric acid soln.; thereafter, the sheet is subjected to the chemical etching treatment by using the aq. soln. contg. the prescribed concn. of the potassium fluoride and hydrofluoric acid, by which the ruggedness is formed on the surface of the stock sheet. A magnetic film of Co system is formed by a sputtering method on such substrate and a carbon protective film is formed thereon to decreased the attraction characteristic to be generated between a head and medium. The contact start-stop CSS resistance characteristic and head stick characteristic are thereby improved.

5. 发明专利

JP2000007345A VACUUM DEFORMING UNIT FOR MOLTEN GLASS 失效
公开(公告)号：JP2000007345A
公开(公告)日：2000-01-11
申请号：JP17323298
申请日：1998-06-19
申请人： ASAHI GLASS CO LTD
发明人： TAKEI YUSUKE , MATSUWAKI MASATAKA , KIJIMA SHUN , SUGIMOTO MITSUO
IPC分类号： C03B5/20 , C03B5/225
摘要： PROBLEM TO BE SOLVED: To provide the subject defoaming unit so designed as to embed chromium- based refractory bricks in the inside of the brick layer representing the inner surface of a tube channel subject to contact with molten glass to prevent the deterioration of glass quality and the breakage of the defoaming unit. SOLUTION: This molten glass defoaming unit is so designed that, when the erosion of the inner surface of brick layer representing a tube channel is slight and dense chromium-based refractory bricks 40, 42 embedded inside the brick layer are not in contact with molten glass, or even if in contact, the contact surface area is small, a molten glass coloration cannot be visually confirmed due to the minute leaching level of chromium oxide, therefore the extent of the above erosion can be understood by glass component analysis; in contrast, when the erosion is advanced and the contact surface area between the bricks 40, 42 and the molten glass becomes larger, the leaching level of chromium oxide also becomes higher and the molten glass sets further greened, and the green color can be recognized visually; therefore the extent of the erosion inside the tube channel can be easily understood and the service life of the defoaming unit itself estimated as well because of the change in the chromium oxide content of the molten glass according to the extent of the erosion.

6. 发明专利

JPH11139834A REDUCED PRESSURE DEFOAMING DEVICE FOR MOLTEN GLASS 失效
公开(公告)号：JPH11139834A
公开(公告)日：1999-05-25
申请号：JP30532697
申请日：1997-11-07
申请人： ASAHI GLASS CO LTD
发明人： TAKEI YUSUKE , KIJIMA SHUN , TANIGAKI JUNJI , IMAMAKI SHOJI , MATSUWAKI MASATAKA
IPC分类号： C03B5/18 , B01J3/00 , C03B5/225
摘要： PROBLEM TO BE SOLVED: To enable the drastic reduction of a cost, the increase in the capacity of the device, the elevation of a reduced pressure defoaming temp., etc., while ensuring a sufficient durability by forming a reduced pressure defoaming vessel of a molten glass and a riser and downcomer communicating therewith of electorforming bricks and forming the extension pipes of the riser and the downcomer of platinum or platinum alloys. SOLUTION: The reduced pressure defoaming device 10 continuously executes the reduced pressure defoaming treatment of the molten glass G in a melting vessel 20 and supplies the glass to a molding stage. The reduced pressure defoaming vessel 14 disposed in a reduced pressure housing 12 and the riser 16 and downcomer 18 for introducing and leading out the molten glass G into and out of the reduced pressure defoaming vessel 14 are formed of the electroforming bricks in at least the parts thereof in direct contact with the molten glass. The extension pipes 26, 28 which are disposed in communication with the bottom ends of the riser 16 and the downcomer 18 and are immersed into the molten glass are formed of the platinum or platinum alloys. The top ends of the extension pipes 26, 28 are flanged and the flanges are held and fixed by inserting the flanges into the joints of the electroforming bricks forming the riser 16 and the downcomer 18.

7. 发明专利

JPH11130443A PARALLEL TYPE REDUCED PRESSURE DEFORMING APPARATUS 失效
公开(公告)号：JPH11130443A
公开(公告)日：1999-05-18
申请号：JP29393997
申请日：1997-10-27
申请人： ASAHI GLASS CO LTD
发明人： TAKEI YUSUKE , KIJIMA SHUN , TANIGAKI JUNJI , IMAMAKI SHOJI
IPC分类号： C03B5/18 , C03B5/225
摘要： PROBLEM TO BE SOLVED: To mechanically deal with a fluctuation in production and to obtain molten glass having excellent homogeneity by allowing a plurality of reduced pressure defoaming sections of a parallel type reduced pressure deforming apparatus to communicate with one another by a pressure equalizer. SOLUTION: This device includes two pieces of the first reduced pressure defoaming section 11 and second reduced pressure defoaming section 12 which execute reduced pressure defoaming of the molten glass supplied from a melting vessel 20 and a confluent section 50 which joins and stirs the molten glass from these reduced pressure defoaming sections and supplies the molten glass to a downstream side. Two pieces of these reduced pressure defoaming sections of the device having vacuum sucked reduced pressure housings 11a, 12a, reduced pressure defoaming vessels 14, 15 which are arranged in these reduced pressure housings 11a, 12a and execute the reduced pressure defoaming of molten glass, riser pipes which are arranged to communicate with the reduced pressure defoaming vessels 14, 15, respectively, and introduce the molten glass prior to reduced pressure defoaming supplied from a melting vessel 20 into the reduced pressure defoaming vessels 14, 15 and downcomers 18, 19 which are means for leading the molten glass after the reduced pressure defoaming out of the reduced pressure defoaming vessels 14, 15 to the confluent section 50, are allowed to communicate with each other by means of the pressure equalizer.

8. 发明专利

JPH04251437A PRODUCTION OF SUBSTRATE FOR MAGNETIC DISK 失效
公开(公告)号：JPH04251437A
公开(公告)日：1992-09-07
申请号：JP14955191
申请日：1991-05-24
申请人： ASAHI GLASS CO LTD
发明人： TAKIGAWA TOMOYA , KIJIMA SHUN , MURAMOTO SHIGERU , TASHIRO AKIHIKO
IPC分类号： C03C15/00 , G11B5/84
摘要： PURPOSE:To improve the glass substrate for magnetic disks, particularly CSS characteristics and static friction characteristics by forming the ruggedness of the substrate for magnetic disks consisting of glass formed with the microruggedness on the surface in such a manner that the max. height of the ruggedness is within the range of prescribed values and the ruggedness is formed at pitches of a prescribed range. CONSTITUTION:The glass blank plates are subjected to prescribed rough lapping and polishing, then to washing and drying on both surfaces. Such glass blank plates are fixed at the center to a revolving shaft 39 to form a disk-shaped glass assembly 30. After an upper part 35 of an etching tank is removed, the assembly 30 is mounted to a motor 32 and the upper part 35 is mounted again. The upper part 35 and lower part 36, and gaseous mixture supply pipings 33 and pipings are controlled to a prescribed temp. and gaseous nitrogen is discharged from a gaseous mixture discharge pipe 34. While the assembly 30 is kept rotated, the assembly is rested for a prescribed period of time. The gaseous mixture is thereafter discharged from the discharge pipe 34 for a prescribed period of time to execute etching. The ruggedness having the surface roughness suitable for the magnetic disk substrates is obtd. in this way.

9. 发明专利

JPS6467714A GLASS SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURE THEREOF 失效
公开(公告)号：JPS6467714A
公开(公告)日：1989-03-14
申请号：JP22403487
申请日：1987-09-09
申请人： ASAHI GLASS CO LTD
发明人： MATSUI ATSUSHI , SERA TAKAAKI , KIJIMA SHUN
IPC分类号： G11B5/82 , G11B5/73 , G11B5/84
摘要： PURPOSE:To improve a magnetic characteristic by forming a surface to be finely rugged and obtaining the rounded top of a projecting part on the rugged surface. CONSTITUTION:The surface to be rugged is formed by executing a chemical etching processing to a glass surface and next, a mechanical grinding processing is executed to this surface. Accordingly, the top of the projecting part is made rounded on the surface to be equally and finely rugged. Here, preferably the maximum height of the surface roughness due to the ruggedness is =50Angstrom in the reference length 50mum. Thus, the magnetic characteristic of a CSS characteristic, a head stick property and an S/N, etc., are improved.

10. 发明专利

JP2003146675A APPARATUS FOR MANUFACTURING FLOAT GLASS AND METHOD OF MANUFACTURING THE SAME 审中-公开
公开(公告)号：JP2003146675A
公开(公告)日：2003-05-21
申请号：JP2002312898
申请日：2002-10-28
申请人： ASAHI GLASS CO LTD
发明人： KIJIMA SHUN , TAKAHASHI YOSHIKAZU , SASAKI MICHITO
IPC分类号： C03B18/16 , C03B5/167 , C03B5/26 , C03C3/062 , C03C3/091 , C03C3/093
摘要： PROBLEM TO BE SOLVED: To significantly decrease open pores and fine striae on the under surface of float glass. SOLUTION: The apparatus for manufacturing the float glass has a tuyere 12 and stationary refractories 22 located below the same, controls the flow rate of molten glass 1 of silicate glass containing >=3 wt.% B2 O3 by vertically moving the tuyere 12 and feeding the molten glass to a molten metal bath 5 from a lip 23 of a spout, in which the lip 23 comprises glassy hot melted refractories mainly composed, by weight %, of 85 to 97% ZrO2 and the balance SiO2 .

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