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Tempered Glass Defects
Jul 24, 2017

Tempered Glass defects
 The defects mentioned here are the defects that are not easily observed by the glass after being tempered, such as stress spots, blast spots, rainbow spots, white mist and blew.

Let the wind spot it is the glass in the cooling process, due to the uneven uneven due to uneven stress and the formation of its special angle in the observation, will see the glass surface was dark and dark stripes. Solution, the general use of air knife cooling instead of the traditional wind hole cooling, is to make the greatest possible to avoid the emergence of wind spots. Stress spots and wind spots almost, but also because of uneven stress caused. It is, to a certain extent, a feature point for identifying Tempered Glass.
Stress spot at present there is no way to avoid the world, mainly in the installation of attention to the local climate and other natural factors to make the naked eye can not distinguish.
Rainbow spot, is the inherent characteristics of Tempered Glass, it is formed, the float glass in the molding process, the tin surface into the tin oxide (SNO), the steel was oxidized to tin oxide (SNO2), the volume expansion, the glass surface Compression occurs fine wrinkles, so that light interference color. In a certain distance and a specific angle to observe the Tempered Glass, you will see the glass surface appears some distribution is not very regular with colored markings.

The phenomenon of the culprit, in the final analysis, or glass after the stress distribution caused by uneven, if the stress distribution of the more uniform glass, the rainbow markings appear smaller. Rainbow spot phenomenon on the quality of Tempered Glass itself does not have an impact, the national standard has not its limitations and requirements. However, the relative appearance of the rainbow markings, will inevitably lead to customer dissatisfaction. Another one is that the rainbow spot may be a poor storage of glass and produce mildew, such as: glass leaching rain, storage warehouse environment temperature higher.

White mist (some also known as white Road), refers to the middle part of the glass there is a difficult to get rid of the traces, which is formed in the process of steel. As the heating temperature of the tempered furnace is not set, the lower part of the temperature is too high, causing the ceramic roller surface temperature is too high, the glass in the first one-third of the heating time, the warpage time is too long, the middle of the glass and ceramic roller repeated friction , It will produce white mist, white mist is abrasions. It is possible to reduce or throw away the white mist by polishing the glass with a polishing wheel of wool felt on the glass.

Blew, ⑴ is generally defined as: the Tempered Glass in the absence of direct external force occurred under the phenomenon of automatic burst. Blew according to the different causes can be divided into two kinds:

The first is caused by the visible defects in the glass, such as stones, sand, bubbles, inclusions, gaps, scratches, burst, etc .;

The second is caused by the volume expansion caused by the phase change of nickel sulfide (NIS) in the glass.

As the first blew, the general visual visible, easy to detect, whether in production or installation before use, can be controlled. And the second blew it, because it can not be visual inspection and continue to exist, as the use of Tempered Glass blew the main factors. But also because of the second blew uncontrollable, it will cause serious quality problems and social concerns, so we generally referred to blew all refer to the latter case.

⑵ Tempered Glass blew the root cause is because the glass contains nickel sulfide impurities, impurities are how to mix is not yet clear to find out. The largest possible source is the use of various nickel-containing alloy components and various heat-resistant alloys used on the furnace. 1 gram of nickel sulfide can produce about 1000 small diameter of 0.15 mm small stones. Nickel sulfide can occur at any time after the production is complete. So there is no effective way to prevent the complete elimination of impurities mixed with nickel sulfide, the industry known as "glass cancer."

⑶ Tempered Glass blew time is no certainty, may be just baked, it may be shipped from 1 to 2 months, there are factories 1 to 2 years before blew, causing more of the time of the glass blew may be finished after the completion of production Of 4 to 5 years. According to incomplete understanding, the probability of most manufacturers of products is about three thousandths of the rate of blasting; individual manufacturers may even higher probability of product.