Method for cleaning and treating lamp glass tubes comprises washing the glass tubes with an aqueous washing medium at a specified ph and temperature

A technology of glass lamp tubes and fluorescent lamps, which is applied in the field of fluorescent lamps for background lighting, and can solve the problems that the lamp tubes cannot meet the purpose of use and the glass has poor chemical corrosion resistance.

Inactive Publication Date: 2009-08-19
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Commonly used cleaning processes have many disadvantages: For example, due to the poor resistance of the glass to chemical attack, the glass surface reacts with the cleaning solution during the cleaning process, e.g. leaching (Auslaugung)
In the worst case, this means that, due to the shortened tube, the tube is no longer fit for purpose and has to be discarded as scrap

Method used

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  • Method for cleaning and treating lamp glass tubes comprises washing the glass tubes with an aqueous washing medium at a specified ph and temperature
  • Method for cleaning and treating lamp glass tubes comprises washing the glass tubes with an aqueous washing medium at a specified ph and temperature
  • Method for cleaning and treating lamp glass tubes comprises washing the glass tubes with an aqueous washing medium at a specified ph and temperature

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] SiO 2 66

[0126] Al 2 o 3 2.5

[0127] B 2 o3 18

[0128] Li 2 O 0.5

[0129] Na 2 O 0.5

[0130] K 2 O 7.5

[0131] MgO

[0132] CaO

[0133] SrO

[0134] BaO

[0135] ZnO 0.5

[0136] ZrO 2

[0137] As 2 o 3

[0138] Sb 2 o 3 0.5

[0139] Fe 2 o 3

[0140] TiO 2 4

[0141] Total 100

[0142] The geometric dimensions of the glass tube are as follows:

[0143] Outer diameter: 3.4mm

[0144] Inner diameter: 2.4mm

[0145] Wall Thickness: 0.5mm and

[0146] Glass tube length: 500mm.

[0147] The cleaning method of the present invention is carried out on glass tubes having the above composition and dimensions. In this case, the shrinkage (“shrinkage”) of the individual glass tubes in mm at different pH values ​​as a function of the different cleaning times and cleaning temperatures was determined.

Description of drawings

[0148] The results are sho...

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Abstract

Method for cleaning and treating lamp glass tubes comprises washing the glass tubes with an aqueous washing medium at a pH of 7-12 and a temperature of 20-80[deg] C.

Description

field of invention [0001] The invention relates to a method for cleaning or treating glass lamp tubes for fluorescent lamps, in particular fluorescent lamps suitable for background lighting. Background technique [0002] Gas discharge lamps, such as CCFL (cold cathode fluorescent lamp) gas discharge lamps or EEFL (external electrode fluorescent lamp) gas discharge lamps, are known to use alkali-containing silicate glasses, especially borosilicate glasses. The main component of this glass is SiO 2 , B 2 o 3 As well as alkali metal oxides and alkaline earth metal oxides. Due to the B in the glass matrix 2 o 3 The content of glass is relatively high, for example, as high as 10-20%, so this glass has poor chemical resistance to alkali and acid, and its resistance to hydrolysis is also weak. [0003] In addition, it is well known that, in order to purify the glass tube, it needs to be washed before the actual manufacture of the lamp can begin. The purpose of this cleaning ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B3/08
Inventor 乔格·H·费克纳马库斯·奥利格马赛厄斯·多伊克福尔克·斯蒂登丹尼斯·特拉普弗朗兹·耶格弗朗兹·奥特沃纳·本纳雷纳·艾科尔兹
Owner SCHOTT AG
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