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The Causes and Solutions of Air Marks of the Tempered Glass
Source : www.landglass.co    Release time:2013-08-22

4. Air mark 

Air mark is called stress mark too. During the quenching process by air in the glass tempering furnace, the glass sheet is not cooled down evenly and the residential stress inside the glass sheet is uneven too, thus, air mark comes into being.  


The more uneven the residential stress is, the more obvious the air marks are.


Please note, air mark used to be one feature of the tempered glass and heat-strengthened glass, but good glass tempering furnace can make air marks invisible to naked eyes. When there are air marks on tempered glass, usually it is due to the uneven quenching. 

 

Solutions:
1. Increasing the blowing distance between the glass sheets and chillers, so as to decrease the air pressure on individual parts of the glass sheet.
2. Increasing the oscillation speed in quenching section, so as to make quenching more even.

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