JPH11335132A - Pale-color plate glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pale-color plate glass of specific thickness by specifying its excitation purity determined using the standard C light source so as to enable both the visual recognizability and texture to be secured even in the form of a large-area glass screen of increased effective thickness. SOLUTION: This pale-color plate glass with a thickness of >=12 mm is such one as to be 496-550 nm in the principal wavelengths determined using the standard C light source and 0.30-0.75% in the excitation purity determined using the standard C light source and calculated as 12 mm-thickness. The pale- color plate glass, despite being >=12 mm in thickness, does not so differ in texture from plate glass about 5 mm thick with general-purpose composition. The large-area glass screen means a plate glass with a width of 2-3 m and a height of >=3 m; the composition of such a plate glass is as follows (on an oxide basis): 65-75 wt.% SiO2 , 0.1-5 wt.% Al2 O3 , 10-18 wt.% Na2 O+K2 O, 5-15 wt.% CaO, 2-6 wt.% MgO, 0.02-0.08 wt.% Fe2 O3 , 0-0.5 wt.% TiO2 , 0-1.5 wt.% CeO2 , and 0-0.002 wt.% CoO.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thick glass mainly used for buildings other than single-family houses such as commercial buildings and public buildings.

[0002]

2. Description of the Related Art In recent years, hotels, museums, museums, office buildings, etc., lobby openings, racetrack stand openings,
For example, a large-area glass screen with a width of 2 to 3 m and a height of 3 m or more for reasons such as viewing the outside scenery, emphasizing visual continuity with the outside, and giving a sense of openness. Tend to be used frequently. The same tendency is remarkable in showrooms, indoor training facilities, and the like where large products such as automobiles are displayed.

When the opening of a building is made of a large-sized glass screen for the above-mentioned purpose, a vertical or metal frame which impairs visibility is not used at all, or the use thereof is minimized. It is necessary to adopt a construction method in which a glass screen is attached to the building frame. For the large-area glass screen, a plate glass having a thickness of 8 mm or more is used to ensure strength. In most cases, a thickness of 12 to 1
9 mm sheet glass is used.

In a large area glass screen up to about 6 m in height, a construction method in which the large area glass screen is placed on a lower / metal frame is often used. In a large area glass screen with a height exceeding 6 m and up to about 12 m,
A method of suspending a large area glass screen is often used. In this hanging method, a glass framing (hereinafter, referred to as a glass rib) is used, but a sheet glass having a thickness of 12 mm or more is used for the glass rib in order to reduce the protrusion to the inside of the building, that is, to reduce the depth and secure the strength. . In addition, the width corresponding to the depth of the glass rib is approximately 200 to 900 mm.

[0005]

Large area glass screens have the same level of visibility as conventional thicknesses of glazing of conventional composition, ie, less than 12 mm, often about 5 mm thick. And texture is required. The dominant wavelength of the sheet glass of the conventional composition here is about 50.
The stimulus purity at 9 nm and 5 mm thickness is about 0.61%. Hereinafter, a sheet glass having a conventional composition having a thickness of 5 mm is referred to as a standard sheet glass.

When a sheet glass of the conventional composition is used as it is for a large-area glass screen, the thickness becomes 12 mm or more, so that the color becomes darker, visibility deteriorates, and the sheet glass of the conventional composition of the conventional thickness has a texture. Will be different.

[0007] This problem becomes more important in the construction method using the glass rib. That is, when the front is viewed obliquely from the inside or outside of the building through the large-area glass screen, and when the glass ribs appear to overlap, the glass thickness is effectively increased by the amount obliquely crossing the light rays through the glass ribs. Large area glass screens using glass ribs have traditionally been used primarily on lower floors,
In recent years, it has come to be used on higher floors due to improvements in building technology and design requirements. In this case, in order to secure wind resistance, a thicker glass sheet is used than in a lower story, and the effective glass thickness further increases.

Further, a large-area glass screen is made of a heat insulating material,
Increasingly, it is composed of double-glazed glass having excellent sound insulation properties. Further, in recent years, the technology of using a large-area glass screen as a structural body has been advanced, and the number of buildings having a function of a beam or a pillar by bonding several thick plate glasses has been increasing. In either case, the effective glass thickness increases.

As described above, the tendency of the effective glass thickness increase in a large area glass screen is remarkable.
Ensuring visibility and texture has become an even more important issue. An object of the present invention is to provide a light-colored plate glass that solves the above-mentioned problems that have become prominent in recent years.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a thickness of 12 m is provided.
m or more, and the dominant wavelength measured using a standard C light source of the plate glass is 496 to 550 nm;
A light-colored glass sheet having a stimulus purity of 0.30 to 0.75% measured using a standard C light source in terms of a thickness of 2 mm is provided.

As a result of various investigations, the present inventors have found that a sheet glass having a thickness of 12 mm or more is required to have the same texture as a standard sheet glass. In response to this, the present inventors have conducted intensive research and found that the texture mainly corresponds to a certain range of the dominant wavelength and the stimulus purity. That is, while the dominant wavelength of a standard plate glass having a thickness of 5 mm is about 509 nm and the excitation purity is about 0.61%, the excitation purity of a conventional plate glass having a thickness of 12 mm is about 1.46%. This is the main cause of the difference in texture. The condition for preventing a remarkable difference in texture from being felt as compared with the standard plate glass is that the main wavelength is 496 to 550 n.
m and a stimulus purity of 0.30 in terms of 12 mm thickness.
０．７0.75%.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The light-colored glass sheet in the present specification is a glass sheet having a thickness of 12 mm or more and a texture not so different from a glass sheet of a conventional composition having a thickness of about 5 mm. The large area glass screen in this specification has a width of 2 to 3 m and a height of 3 m or more as a main component, and in some cases, a width of 200 to 900 mm,
A glass rib having a height of 3 m or more is provided as a component.

The light-colored glass sheet of the present invention has a thickness of 12 mm or more. If it is less than 12 mm, the strength may be insufficient when used as a large area glass screen. It is preferably at least 15 mm, more preferably at least 19 mm.

The stimulus purity measured with a standard C light source in terms of 12 mm thickness is 0.30 to 0.75%. 0.
If it is less than 30%, it looks too bright and may have a texture like an acrylic plate different from a standard plate glass. It is preferably at least 0.40%, more preferably at least 0.45%. If it exceeds 0.75%, the color of the glass becomes too dark, the visible light transmittance decreases, and the visibility decreases.
It may have a texture different from that of the standard plate glass. Preferably it is 0.70% or less, more preferably 0.65% or less.

The dominant wavelength measured using a standard C light source is 49
6 to 550 nm. If the thickness is less than 496 nm, the material may have a texture different from that of the standard plate glass within the range of the stimulation purity. It is preferably at least 498 nm, more preferably at least 500 nm. If it exceeds 550 nm, the color of the glass becomes yellowish and may have a texture different from that of the standard plate glass. Preferably 540n
m, more preferably 530 nm or less.

The visible light transmittance measured using a standard A light source in terms of a thickness of 12 mm is preferably 83 to 89%. If it is less than 83%, the visibility may be reduced. It is more preferably at least 85%, particularly preferably at least 86%. If it exceeds 89%, it looks too bright and may have a texture different from that of the standard plate glass.

The composition of the light-colored glass sheet of the present invention is substantially expressed in terms of% by weight on an oxide basis: SiO ₂ 65-75, Al ₂ O ₃ 0.1-5, Na ₂ O + K ₂ O 10-18, CaO 5 , MgO 2 to 6, Fe ₂ O ₃ 0.02 to 0.08, TiO ₂ 0 to 0.5, CeO ₂ 0 to 1.5, and CoO 0 to 0.002.

If the content of SiO ₂ is less than 65% by weight, the weather resistance is reduced, and if it exceeds 75% by weight, the viscosity becomes high and the melting becomes difficult. If the content of Al ₂ O ₃ is less than 0.1% by weight, the weather resistance is reduced, and if it exceeds 5% by weight, melting becomes difficult.
Na ₂ O and K ₂ O are components that promote the melting of the raw material.
If the total content of both is less than 10% by weight, the effect is small, and if it exceeds 18% by weight, the weather resistance is reduced.

CaO and MgO are components that promote the melting of the raw materials and improve the weather resistance. When the content of CaO is less than 5% by weight, the above effect is small, and when the content is more than 15% by weight, devitrification tends to occur. When the content of MgO is less than 2% by weight, the above-mentioned effect is small, and when the content exceeds 6% by weight, devitrification tends to occur.

Fe ₂ O ₃ is a component for adjusting the texture of the glass. If it is less than 0.02% by weight, the stimulating purity may be too low. It is preferably at least 0.03% by weight, more preferably at least 0.04% by weight. If it exceeds 0.08% by weight, the visible light transmittance may be reduced and the visibility may be deteriorated. Preferably it is 0.07% by weight or less, more preferably 0.06% by weight or less.

TiO ₂ is not essential, but may be added up to 0.5% by weight for texture adjustment. CeO ₂ is not essential, but may be added up to 1.5% by weight for texture adjustment. CoO is not essential, but may be added up to 0.002% by weight for texture adjustment. Redox showing the percentage of divalent iron in terms of Fe ₂ O ₃ in the total iron in terms of Fe ₂ O _3% in the display is preferably 40 or less.

[0022]

EXAMPLES As raw materials, silica sand, feldspar, dolomite, soda ash, sodium sulfate, ferric oxide, titanium oxide, cerium oxide, and cobalt oxide were used. The batch thus prepared was melted in a platinum crucible, the molten glass was poured out onto a carbon plate, and gradually cooled,
Sheet glass was manufactured. F in total iron converted to Fe ₂ O ₃
Redox in which the ratio of divalent iron converted to e ₂ O ₃ is expressed in% is also shown in the composition column.

For these sheet glasses, the dominant wavelength D _w
(Nm), 5mm, 12mm, visible light transmittance was converted to the thickness of 19mm T _Va (%) and excitation purity P _e (%)
Are also shown in Table 1. Example 5 is a sheet glass of conventional composition outside the scope of the present invention.

[0024]

[Table 1]

[0025]

According to the present invention, it is possible to provide a light-colored glass sheet having a texture not so different from that of a conventional glass sheet having a thickness of about 5 mm.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toru Kudo 1-1-1, Suehirocho, Tsurumi-ku, Yokohama, Kanagawa Prefecture Inside Asahi Glass Co., Ltd. (72) Inventor Shiro Yai 1-1-1, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Asahi Glass Incorporated (72) Inventor Kamei Fumio 1-1, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Asahi Glass Co., Ltd.

Claims (2)

[Claims] 1. A sheet glass having a thickness of 12 mm or more,
The dominant wavelength of the sheet glass measured using a standard C light source is 49.
A light-colored plate glass having a stimulus purity of 6 to 550 nm and a stimulus purity of 0.30 to 0.75% measured using a standard C light source in terms of a thickness of 12 mm. 2. The glass composition is substantially expressed in terms of weight% on an oxide basis: SiO ₂ 65-75, Al ₂ O ₃ 0.1-5, Na ₂ O + K ₂ O 10-18, CaO 5-15, _{MgO 2~6, Fe 2 O 3 0.02~0.08} , TiO 2 0~0.5, CeO 2 0~1.5, CoO 0~0.002, pale glazing according to claim 1, wherein consisting.