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The Causes of Tempered Glass Quality Defects and Their Solutions
Source : www.landglass.co    Release time:2013-09-09

During the glass tempering production by glass tempering furnace, different kinds of glass defects may be left on tempered glass due to some complicated reasons, which are difficult for the tempered glass oven operator to identify the reasons and avoid the defects. However, during our long time customer service, Landglass has analyzed some common defects and provide customers with following practical solutions for avoiding or minimizing these defects, which can be also regarded as the replies to some technical questions from the customers.

4. Glass Waviness 
1) Too long heating time or too high heating temperature may cause this problem. When the glass becomes soft, it may deform on the ceramic roller while oscillating on the ceramic rollers;
2) When the glass oscillates inside heating furnace at very low speed, the soft glass sheet may sag down before it reaches adjacent ceramic roller, therefore, the glass waves; 
3) After heating, the soft glass should be conveyed from heating furnace to quenching section quickly, in case that the glass sags down for above same reasons;

4) The deformation of the ceramic rollers or uneven ceramic roller bed may cause waviness. When the soft glass sheet is moving on the ceramic roller quickly, the bend rollers will hunch up the glass sheet and cause glass waviness.


Solutions
1) Decrease the heating time or lower heating temperature;
2) Increase oscillating speed, so that the glass reaches adjacent roller before it sags down and the glass can keep straight;
3) when the glass moves out of the heating furnace, the exit speed of the glass sheet should be much higher than the oscillating speed in heating furnace, and generally the motor runs at 40% of full speed, so that the glass will move into quenching section quickly;
4) Use high quality ceramic rollers and replace the bent roller with a new one timely so that the rollers are straight; always keep the roller bed flat.


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