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Why is hot melt glass commonly used in partition screens and doors in Guangzhou's craft glass partitions?

Release time:

Dec 04,2024

The reasons for stress patterns in bent tempered glass (usually referring to bent glass that has undergone physical tempering) can be explained from the following aspects:

1. Material Properties

　　Tempered glass, as an anisotropic material, has permanent internal stress (tempering stress). When a beam of polarized light passes through tempered glass, due to the presence of this internal stress, the light decomposes into two beams of polarized light with different propagation speeds, namely fast light and slow light, also known as the birefringence phenomenon. This birefringence phenomenon is the basis for the formation of stress patterns.

　　2. Production Process

　　Uneven heating: During the tempering process, if there is uneven heating in the plane direction during the heating stage, areas with higher temperatures will produce smaller compressive stress, while areas with lower temperatures will produce larger compressive stress. This uneven heating will create a non-uniform distribution of compressive stress on the glass surface, leading to the formation of stress patterns during the subsequent cooling process.

　　Uneven cooling: The cooling process of tempered glass is equally important. If there is unevenness during the cooling process, such as unreasonable distribution of fan nozzles, uneven gaps between nozzles, nozzle blockages, or excessive heat conduction capacity of the roller path, it will lead to uneven cooling of the glass surface, resulting in a non-uniform distribution of stress. This uneven stress distribution will also cause the formation of stress patterns.

　　3. Observation Conditions

　　Observation angle: When people observe tempered glass, if the angle of incidence of light meets certain conditions (for example, when light reflects off the glass surface at an angle of 56 degrees), the reflected light is almost entirely polarized light. At this time, if there is an uneven distribution of stress inside the glass, the polarized light reflected from different surfaces will interfere on the glass surface, producing colorful patterns, known as stress patterns. Changes in the observation angle will affect the visibility and color of the stress patterns.

　　Light polarization: The reflection and refraction effects on the glass surface will cause the light to become polarized. The light entering the glass is actually polarized light. This polarization effect will enhance the visibility of the stress patterns.

　　4. Other Factors

　　Glass thickness: As light propagates through glass of different thicknesses, the thicker the glass, the longer the light path, and the more opportunities for the light to become polarized. Therefore, for glass with the same level of stress, the thicker the glass, the more pronounced the color of the stress patterns.

　　Type of glass: Different types of glass have different sensitivities to stress patterns. For example, borosilicate glass tends to show lighter stress pattern colors compared to soda-lime glass.

　　In summary,

the reasons for the formation of stress patterns in bent tempered glass are multifaceted, including material properties, production processes, observation conditions, and other factors. Although stress patterns are a characteristic 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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