Why does custom processing of curved tempered glass in Foshan have stress marks?
Release time:
Dec 04,2024
The reasons for the formation of stress patterns in curved glass (commonly referred to as curved tempered glass) can be explained from two aspects: its production process and physical properties.
- Production process
Heating process:
During the tempering process, the glass first needs to go through a heating stage. If there is uneven heating in the plane direction of the glass during the heating process, it will lead to smaller compressive stress in the areas with higher temperature and larger compressive stress in the areas with lower temperature.
This uneven heating will cause unevenly distributed compressive stress on the glass surface, resulting in stress patterns during the subsequent cooling process.
Cooling process:
The cooling process of tempered glass is equally important. If the cooling intensity is uneven during the cooling process, it will also lead to uneven stress.
Specifically, areas with high cooling intensity will have greater surface compressive stress, while areas with low cooling intensity will have smaller compressive stress. This uneven cooling will also cause unevenly distributed stress on the glass surface, leading to the formation of stress patterns.
- Physical properties
Material characteristics:
As an anisotropic material, tempered glass contains permanent stress (tempering stress) within it. When a beam of polarized light passes through tempered glass, due to the presence of this internal stress, the light will split into two beams of polarized light that propagate at different speeds, known as fast light and slow light, which is also referred to as the birefringence phenomenon.
This birefringence phenomenon is the basis for the formation of stress patterns. When the two beams of light intersect at a certain point, due to the difference in propagation speeds, there is a phase difference at the intersection point, leading to interference between the two beams. When the amplitude directions of the two beams are the same, the light intensity increases, creating a bright field, or bright spot; when the amplitude directions are opposite, the light intensity decreases, creating a dark field, or dark spot.
Observation conditions:
The visibility of stress patterns is also affected by observation conditions. For example, the angle of observation and light polarization can influence the visibility and color of stress patterns. When the angle of incidence of light meets certain conditions, the reflected light is almost entirely polarized.
At this time, if there is uneven stress distribution within the glass, the polarized light reflected from different surfaces will interfere on the glass surface, creating colorful patterns, known as stress patterns.
In summary, the reasons for the formation of stress patterns in curved glass are multifaceted, including unevenness during the heating and cooling processes as well as the physical properties of the material. Although stress patterns are a characteristic feature of tempered glass to some extent, they can be reduced through improvements in production processes, the use of advanced equipment, and optimization of observation conditions to meet higher aesthetic requirements.
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China Guangdong Haibo Special Glass Technology Co., Ltd. Unified Social Credit Code: 91440101MA5AT33G12 Contact Numbers: General Manager Cao, 13178822749; General Manager Wei, 13533794186.