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Tempered Glass Blew Solution
Jun 23, 2017

  Tempered glass blew solution

  1, reduce the stress of tempered glass

  The distribution of stress in the tempered glass is that the two surfaces of the tempered glass are compressive stress, the core layer is in tensile stress, and the stress distribution on the glass thickness is similar to that of the parabola. The thickness of the glass is the center of the parabola, that is, the maximum tensile stress; both sides close to the glass surface is the compressive stress; zero stress plane is about 1/3 of the thickness. By analyzing the physical process of quenching and tempering, we can see that the surface tension of the tempered glass and the maximum tensile stress in the interior have a sharp proportional relationship with each other, that is, the tensile stress is 1/2 ~ 1/3 of the compressive stress. Tension set at 100MPa or so, the actual situation may be higher. The tension of the tempered glass itself is about 32MPa ~ 46MPa, the tensile strength of the glass is 59MPa ~ 62MPa, as long as the expansion of nickel sulfide tension at 30MPa, is sufficient to cause blew. If the surface stress is reduced, the tensile stress of the tempered glass itself is reduced, thereby contributing to the reduction of bleed-out.

  The surface pressure range of the tempered glass is greater than 69MPa and the semi-steel (heat strengthened) glass is 24MPa ~ 52MPa. The curtain glass standard BG17841 is specified as semi-steel stress range of 24 <δ≤69MPa. China's March 1 this year Implementation of the new national standard GB15763.2-2005 "Building safety glass Part 2: Tempered glass" requires that its surface stress should not be less than 90MPa. This than the previous standard 95MPa reduced by 5MPa, is conducive to reducing blew.

  2, so that the stress of the glass uniform

  Tempered glass uneven stress, will significantly increase the rate of blasting, has been to the extent that can not be ignored. Unevenness caused by uneven stress is sometimes very concentrated, especially the bending of a specific batch of tempered glass burst rate will reach a shocking severity, and may occur continuously blew. The main reason is the local stress uneven and tension layer in the thickness of the direction of the deviation, the quality of the original glass itself has a certain impact. Stress unevenness will significantly reduce the strength of the glass, to a certain extent, the equivalent of increasing the internal tensile stress, thus increasing the rate of blasting. If you can make the stress of the tempered glass evenly distributed, you can effectively reduce the rate of self-blasting.

  3, hot-dip treatment (HST)

  Hot dip interpretation. Hot-dip treatment, also known as homogeneous treatment, commonly known as "detonated." Hot-dip treatment is the tempered glass heated to 290 ℃ ± 10 ℃, and insulation for a certain period of time, to promote the nickel sulfide in the tempered glass in the rapid completion of crystal phase transformation, so that after the original use of polished glass can be artificially broken in advance of the factory Hot-dip furnace, thereby reducing the use of tempered glass after installation. The method generally used hot air as a heating medium, foreign called "HeatSoakTest", referred to as HST, literal translation for the hot dip treatment.





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