JPH0340819B2 - - Google Patents
Info
- Publication number
- JPH0340819B2 JPH0340819B2 JP21511583A JP21511583A JPH0340819B2 JP H0340819 B2 JPH0340819 B2 JP H0340819B2 JP 21511583 A JP21511583 A JP 21511583A JP 21511583 A JP21511583 A JP 21511583A JP H0340819 B2 JPH0340819 B2 JP H0340819B2
- Authority
- JP
- Japan
- Prior art keywords
- glass plate
- float glass
- reflectance
- back surfaces
- determining
- 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.)
- Expired
Links
- 239000005329 float glass Substances 0.000 claims description 15
- 239000011521 glass Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 230000001678 irradiating effect Effects 0.000 claims description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000002070 germicidal effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Surface Treatment Of Glass (AREA)
Description
【発明の詳細な説明】
本発明はフロートガラス板の表裏面判別方法に
関する。フロートガラス板は、製板プロセスの関
係から表面と裏面とで物理的及び化学的に性状が
異つている。このため、このフロートガラス板を
素板として表面処理あるいはその他の加工を行う
場合には、その表裏面を判別して使用しなければ
ならないことがある。しかし、上記表裏面の差異
は極めて微小であるため、その判別は困難をきた
しているのが現状である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for determining the front and back surfaces of a float glass plate. A float glass plate has physically and chemically different properties on its front and back sides due to the plate-making process. Therefore, when performing surface treatment or other processing on this float glass plate as a blank plate, it may be necessary to distinguish between the front and back surfaces before use. However, since the difference between the front and back surfaces is extremely small, it is currently difficult to distinguish between them.
本発明者はこの問題を種々検討した結果、フロ
ートガラス板は光学的に表面と裏面で若干の差が
あり、これらの反射率が若干異なることに着目
し、特に紫外線においてその傾向が顕著であるこ
とを見出し、本発明を完成したものである。 As a result of various studies on this problem, the inventor of the present invention noticed that there is a slight optical difference between the front and back surfaces of a float glass plate, and that the reflectance of these plates differs slightly, and this tendency is particularly noticeable in ultraviolet rays. This discovery led to the completion of the present invention.
フロートガラス板は、フロート成形工程におい
て錫浴面に接触する裏面と接触しない表面とで光
反射率が異つている。第１図はフロートガラスに
紫外線を照射した場合の表面と裏面の反射率を示
す。図から明らかなように、220〜320nｍの波長
域において表面より裏面の方が約１％程度、反射
率が高い傾向がある。 The float glass plate has different light reflectance between the back surface that comes into contact with the tin bath surface and the front surface that does not come into contact with the tin bath surface during the float molding process. Figure 1 shows the reflectance of the front and back surfaces of float glass when irradiated with ultraviolet rays. As is clear from the figure, the reflectance of the back surface tends to be about 1% higher than that of the front surface in the wavelength range of 220 to 320 nm.
本発明はこの反射率の差を例えば光電子倍増管
を使用して検知し、これに基いて表裏面を判別す
るもので、判別は電気的に迅速に行うことができ
る。 In the present invention, this difference in reflectance is detected using, for example, a photomultiplier, and based on this, the front and back surfaces are discriminated, and the discrimination can be quickly performed electrically.
第２図は、本発明によりフロートガラス板の表
裏面を判別する場合の一例を示す。本例はコンベ
ヤにより搬送されてくるガラス板１の表裏面を連
続的に判別するもので、光源２よりガラス板１に
所望の波長の紫外線を照射し、その反射光を例え
ば光電子増倍管３により検出し、この検出信号を
制御盤４により処理して判別する。上記光源２と
しては、例えば殺菌灯を使用することができ、ガ
ラス板１の板面に対し通常は斜め方向から照射す
るのが望ましい。 FIG. 2 shows an example in which the front and back surfaces of a float glass plate are discriminated according to the present invention. In this example, the front and back sides of a glass plate 1 conveyed by a conveyor are continuously determined. A light source 2 irradiates the glass plate 1 with ultraviolet rays of a desired wavelength, and the reflected light is emitted to a photomultiplier tube 3, for example. This detection signal is processed by the control panel 4 and discriminated. As the light source 2, for example, a germicidal lamp can be used, and it is desirable to irradiate the surface of the glass plate 1 from an oblique direction.
制御盤４には、ガラス板１の表面あるいは裏面
の反射率を予め設定しておき、光電子倍増管３に
より検出された反射率をこの設定値と対比するこ
とにより、上記ガラス板１の表面あるいは裏面を
判別する。尚、この判別結果は、表示灯５，６に
より例えば５が照灯すれば裏面、６が照灯すれば
表面として検知する。 The reflectance of the front or back surface of the glass plate 1 is set in advance on the control panel 4, and by comparing the reflectance detected by the photomultiplier tube 3 with this set value, the reflectance of the front or back surface of the glass plate 1 is set. Identify the back side. As a result of this determination, for example, if indicator lamps 5 and 6 illuminate, it is detected that the back side is detected, and if indicator lamp 6 is illuminated, it is detected that the front side is detected.
なお、この場合ガラス板１の反射率はガラス板
の厚味の変更などにより多少変わる場合があるの
で、板厚の変更あるいは製板のロツトが変るごと
に、必要に応じその設定値を再調整するようにす
る。 In this case, the reflectance of the glass plate 1 may change slightly due to changes in the thickness of the glass plate, so readjust the set value as necessary whenever the plate thickness changes or the lot of plate manufacturing changes. I'll do what I do.
また、ガラス板１の表裏面の反射率は、前記し
たように220〜320nｍの紫外線波長域において顕
著な差異を有するので、検出に使用する紫外線と
してはこの波長域のものを使用する。 Furthermore, since the reflectance of the front and back surfaces of the glass plate 1 has a remarkable difference in the ultraviolet wavelength range of 220 to 320 nm as described above, the ultraviolet light used for detection is in this wavelength range.
本発明は以上記述したように構成されているの
で、フロートガラス板面に紫外線を照射し、その
反射率を検出することにより、その表裏面を簡便
に判別できる。 Since the present invention is configured as described above, by irradiating the surface of a float glass plate with ultraviolet rays and detecting its reflectance, it is possible to easily distinguish between the front and back surfaces of the float glass plate.
第１図はフロートガラス板に紫外線を照射した
場合の表面及び裏面における反射率分布の一例を
示す説明図、第２図は本発明の実施例に係るフロ
ーシートを示す。
図において、１はフロートガラス板、２は光
源、３は光電子倍増管、４は制御盤。
FIG. 1 is an explanatory diagram showing an example of the reflectance distribution on the front and back surfaces when a float glass plate is irradiated with ultraviolet rays, and FIG. 2 shows a flow sheet according to an embodiment of the present invention. In the figure, 1 is a float glass plate, 2 is a light source, 3 is a photomultiplier, and 4 is a control panel.
Claims (1)
その反射率によりガラス板の表裏面を判別するこ
とを特徴とするフロートガラス板の表裏面判別方
法。 ２ 反射光線を光電子増倍管により検出すること
を特徴とする特許請求の範囲第１項記載のフロー
トガラス板の表裏面判別方法。 ３ 波長が220〜320nｍの紫外線を使用すること
を特徴とする特許請求の範囲第１項記載のフロー
トガラス板の表裏面判別方法。[Claims] 1. Irradiating the surface of a float glass plate with ultraviolet rays,
A method for determining the front and back sides of a float glass plate, characterized by determining the front and back sides of the glass plate based on the reflectance. 2. A method for determining front and back surfaces of a float glass plate according to claim 1, wherein the reflected light beam is detected by a photomultiplier tube. 3. The method for determining the front and back surfaces of a float glass plate according to claim 1, characterized in that ultraviolet light having a wavelength of 220 to 320 nm is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21511583A JPS60107547A (en) | 1983-11-17 | 1983-11-17 | Top and reverse discrimination method of float glass plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21511583A JPS60107547A (en) | 1983-11-17 | 1983-11-17 | Top and reverse discrimination method of float glass plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60107547A JPS60107547A (en) | 1985-06-13 |
| JPH0340819B2 true JPH0340819B2 (en) | 1991-06-20 |
Family
ID=16666996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21511583A Granted JPS60107547A (en) | 1983-11-17 | 1983-11-17 | Top and reverse discrimination method of float glass plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60107547A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020106435A (en) * | 2018-12-27 | 2020-07-09 | 株式会社フジキン | Front/rear identifying method of reflecting member |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5667549A (en) * | 1996-01-25 | 1997-09-16 | Vidrio Plano De Mexico, S.A. De C.V. | Method and system to automatically lift the curtains of the exit hood of a machine for the production of float flat glass |
| CN1685387B (en) * | 2002-11-29 | 2010-05-12 | 松下电器产业株式会社 | Image display and method for manufacturing the same |
| US7545561B2 (en) | 2002-11-29 | 2009-06-09 | Panasonic Corporation | Image display and method for evaluating glass substrate to be used in same |
| JP2004191366A (en) * | 2002-11-29 | 2004-07-08 | Matsushita Electric Ind Co Ltd | Imaging display apparatus and method for evaluating glass substrate for the same |
-
1983
- 1983-11-17 JP JP21511583A patent/JPS60107547A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020106435A (en) * | 2018-12-27 | 2020-07-09 | 株式会社フジキン | Front/rear identifying method of reflecting member |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60107547A (en) | 1985-06-13 |
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