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      Common sense of silicon carbide rods in the glass industry

      1. Cooling section and homogenization section


        When the molten glass flows through the cooling and homogenization section, the molten glass should be uniformly cooled to a temperature suitable for forming. If no measures are taken, the two sides of the material channel will dissipate more heat and the middle part will dissipate less, which will cause the middle part of the glass and The temperature gradient on both sides is large, that is, the temperature of the same section of the glass liquid is not uniform, which makes the viscosity of the glass liquid inconsistent, which directly affects the quality of the molding. In order to make the temperature of the material liquid consistent, on the one hand, a cooling hole is reserved in the cooling section by adjusting the cooling hole The opening degree is used to adjust the heat dissipation in the middle part of the forehearth cooling section to make the temperature uniform; on the other hand, special silicon carbide rods are used for auxiliary heating.

        Silicon carbide rods are generally evenly arranged above the molten glass in the forehearth, keeping a certain distance from the molten glass, and radiating downward heating. In order to ensure that the two sides of the forehearth are heated but the middle part is not heated, generally five-section silicon carbide rods (ie dual heating element silicon carbide rods) dedicated to the glass feeder industry are used. It is made of two identical heating elements and three cold ends which are welded by a special process, that is, one cold end in the middle of the two heating elements, the total length of the three corresponds to the width of the material channel (in the imported material The double-threaded silicon carbide rod is used in the channel) because the middle part of the silicon carbide rod does not generate heat or generates less heat, but the part near the side wall generates heat, coupled with a reasonable design, it can ensure that the temperature of the glass liquid drops evenly during the flow. When designing the forehearth, some manufacturers also use equal-diameter silicon carbide rods (that is, three-section silicon carbide rods), which are welded by a heating element and two cold ends.


        The forehearth uses three-section silicon carbide rods to heat both the glass liquid and the walls on both sides, which can ensure the temperature of each section of the forehearth, and can also supplement the heat dissipation of the side walls, but the homogenization effect is far behind Five-section silicon carbide rod. Regardless of whether three-section rods or five-section rods are used, the homogenization effect is determined by the structure of the feeding channel and the heating of the silicon carbide rods, and the final temperature of each section of the feeding channel is controlled by the control system.


        2. Material bowl section


        After the glass liquid flows through the homogenization section, the temperature uniformly drops to a certain appropriate value. If the temperature at the bowl is not controlled, it is still difficult to ensure a constant and uniform temperature of the gob, so that the temperature is too high or too low will affect The shape of the gob ultimately affects the molding quality of the glass container. Therefore, the scientific method is to control the material bowl separately. There are generally two forms of pot heating:


        (A) Use two gun-shaped silicon carbide rods and a three-section silicon carbide rod to surround the material bowl for heating.


        (B) Choose two trough silicon carbide rods and a three-section silicon carbide rod to evenly distribute around the material bowl to heat the material bowl.

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