Tempered glass with poor flatness can cause reflection optical deformation of the glass after installation, greatly affecting the appearance quality of doors, windows, and curtain walls. On the other hand, it can also cause optical distortion of the glass, further affecting the visual effect of doors, windows, and curtain walls. In addition, tempered glass with poor flatness will also affect the installation effect. Therefore, controlling the flatness of tempered glass for doors, windows, and curtain walls is very important.

1. The problem with the roller conveyor of the tempering furnace causes poor flatness of the tempered glass after tempering

The main reasons for poor flatness of glass rollers include bending deformation of the heating and cooling rollers, as well as wear and tear of the heating and cooling rollers.

1.1 Bending deformation of the heating section roller conveyor and the air cooling section roller conveyor of the tempering furnace

Deformation of ceramic rollers in the heating section of the tempering furnace. The selection of low-quality ceramic rollers in the heating section of the tempering furnace will affect the flatness of the glass. The ceramic rollers in the heating section of the tempering furnace are made of fused silica and ceramic materials, which have good heat shock resistance and thermal stability. However, the non-uniformity of the internal microstructure of low-quality ceramic rollers will lead to thermal deformation of the roller table at high temperatures, which will lead to the bending of the roller table. The thermally deformed roller table will cause deformation when carrying transmission glass. Deformation of the roller conveyor in the air-cooled section. Due to the rapid transfer of glass from the heating section of the tempering furnace to the air cooling section, where the glass is still in a softened state, the roller conveyor of the air cooling section must also be straight and without bending, and the roller conveyor should be smooth and without jumping during transfer, otherwise it will also affect the flatness of the glass.

1.2 Wear and tear of the heating section roller conveyor and the air cooling section roller conveyor in the tempering furnace

Wear and tear of the roller conveyor in the heating section of the tempering furnace. In order to prevent the occurrence of rough spots on the surface of the glass, we will polish and clean the ceramic rollers in the heating section during actual production. We use fine sandpaper to polish the surface of the ceramic rollers to remove impurities adhered to the surface of the ceramic roller. Long term repeated polishing and cleaning of the roller may cause uneven wear of the roller, resulting in uneven local thickness or eccentricity of the same roller. In addition, sometimes the roller tracks are replaced at different times, and the degree of wear between the old and new roller tracks is different, which can cause uneven thickness between the roller tracks. All of the above, whether it is uneven thickness of the same roller conveyor or eccentricity of the roller conveyor, or uneven thickness of different rollers, will cause unevenness on the surface of the roller conveyor. After heating to the softening temperature, glass will inevitably deform itself and affect the flatness of tempered glass when transmitted on this uneven roller conveyor surface.

Wear and tear of the cooling section roller conveyor in the tempering furnace. The tempered glass cover tells you that the roller surface of the cooling section of the tempering furnace is usually wrapped with heat-resistant asbestos rope or insulation material, and asbestos rope or insulation material used for a long time will inevitably be worn out. Due to the wear and tear of asbestos ropes or insulation materials, it can cause unevenness on the surface of the cooling section roller conveyor, which in turn affects the flatness of the glass.

Article source: Tempered glass coverhttp://www.jmzhiyi.cn/