What are tempered glass wind spots and their solutions?

What is tempered glass wind spot:

Wind spots, also known as stress spots, reflect from the necessary polarization angle of glass under polarized or partially polarized illumination conditions. The optical effect is caused by the birefringence phenomenon of tempered glass (tempered glass raw material) due to the internal stress of tempered glass (tempered by a tempering furnace).

Wind spots have a rainbow like effect, which may resemble a checkerboard, a chain, or more, due to the effect of the commonly used horizontal glass tempering furnace and automotive glass tempering furnace air duct openings, they appear as multi circle stripes. These multi circle stress spots are usually seen in the reflected light of cars, especially when using polarized sunglasses or polarizing clips, because polarized glass can only pass through polarized light, while tempered glass is like a partial polarizing mirror.

Wind spots are usually caused by uneven cooling of the cooling air during the production process of tempered glass in the tempering furnace. Stress spots can sometimes be seen on tempered and heat strengthened glass. The stress spots that can be seen under certain lighting conditions are a characteristic of all tempered and thermally reinforced glass, and cannot be considered as product defects. When stress spots appear under certain lighting conditions, they cannot be eliminated.

To a certain extent, it is also a characteristic point for identifying tempered glass.

The presence of wind spots indicates that the glass must have undergone thermal enhancement. But a well-designed tempering furnace can minimize the visibility of stress spots to the greatest extent.

How to reduce wind spots on tempered glass?

1.Design a reasonable angle for the quenching and nozzle

2.The aramid kevlar rope wrapped on the steel roller in both positive and negative directions

3.Reduce heating temperature

4.Reduce wind pressure and extend blowing time appropriately

5.Improve the reciprocating speed and furnace discharge speed of the rapid cooling section of the quenching

6.Appropriately increase the length of the quenching

7.Using swinging wind quenching

8.Using a dual chamber glass tempering furnace or a continuous tempering furnace