Glass has good transparency and light transmission functions, high chemical stability, and is highly favored by people. It can also obtain strong mechanical strength and thermal insulation effects according to different processing methods, and can even make the glass change color autonomously, block excessive light, and meet the different needs of different professions. However, what are the reasons for the appearance defects of some tempered glass?

1、 Reasons for Surface Defects in Tempered Glass

Roll marks: Due to the large distance between the rolling tracks in the tempering furnace, there may be a large jumping force, which may leave roll marks. At this time, sulfur dioxide can be used to treat it. Due to the reaction between sulfur dioxide and the roll surface, a protective film is generated to reduce the possibility of roll marks.

Pitting: For example, if too much sulfur dioxide is introduced, coupled with its strong corrosiveness, it can cause spots on the surface of the corroded raceway, and then leave pockmarks on the surface of tempered glass; Another issue is that the raceway itself is not clean enough, with dirt sticking to it. This can also be treated with a small amount of sulfur dioxide, but if there is a lot of dirt, the raceway needs to be cleaned.

White mist: Generally, white mist occurs due to insufficient tempering temperature.

Tempered Rainbow: Nowadays, float glass is generally produced. In the production process of float glass, the glass paste is spread flat on the surface of the tin tank under the effects of gravity and self tension. There is inevitably one side that touches the tin surface, during which a small amount of tin infiltration effect will occur. At that time, tin oxide will be produced under the temperature conditions. Tin oxide will be oxidized again under high temperature during the tempering process, and the volume will expand, causing some micro cracks on the surface of the glass. These cracks will dry out under special conditions and perspectives when investigating glass, and then tempered rainbow will occur. We can sprinkle fine polishing powder on the surface of the glass to deal with it.

Wind spot: This is caused by uneven cooling during the cooling process, resulting in uneven stress on the glass. Under a certain special observation point, the surface of the glass will show alternating light and dark stripes. The general treatment method is to use wind knife cooling instead of traditional air hole cooling to prevent wind spots as much as possible.

Stress spots: Stress spots are similar to wind spots and are also caused by uneven stress. For example, during the heating process, there is a temperature difference between the edge and middle of the furnace, which leads to uneven stress. Stress spots are currently unavoidable in the world, mainly due to natural factors such as orientation and local climate during installation to make them indistinguishable to the naked eye. It is recommended to use a double chamber tempering furnace instead of a traditional single chamber tempering furnace to minimize stress unevenness.

Article source: Tempered glass coverwww.yinghuade.com