Silicion Carbide heating element: Common Use in the Glass Industry

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silicon carbide heating element : Common Use in the Glass Industry

Relevant words :Electric  heater element ; furnace for laboratory; furnace heating element ; silicon  carbide heating element; silicon carbide heating elements; silicon carbide tube

1. The Cooling and Homogenizing sections

The glass melting should reach a suitable temperature for the forming process when it passes through the homogenizing and cooling sections. In the absence of any measures, heat will be dissipated more from each side of the channel and less from the center, leading to a high temperature gradient from the centre of the glass towards both the sides. The temperature is not uniform, causing the melt to be viscous, and this directly impacts the quality of the forming. The cooling sections are designed with cooling holes, which are adjusted to dissipate heat evenly.

Silicon  carbide heating elements are usually evenly distributed above the melt glass in the feeder channels, while maintaining a distance. They then heat downward through radiation. To ensure both sides of the feeder channel are heated, but the middle isn't, it is common to use special silicon carbide five-section rods (dual-heater rods). The channel is made by joining two identical heating components and three cold ends with a special welding process. A cold end connects between the heating elements. The middle of the rod is not heated or produces little heat while the end closest to the wall creates heat. This, combined with a reasonable design can make sure that the temperature drops evenly during the flow. Some manufacturers choose to use equal-diameter  silicon carbide heating element (i.e. three-section rods) in the design. These rods are made by joining one heating element with two cold ends.

Three-section silicon carbide tubes selected for the feeder channel heat not only the glass melt, but also both the sides of the walls. The three-section rods can be used to maintain the desired temperature in each feeder section and help dissipate heat from the sides. However, the homogenization is much less effective than the five sections. The homogenization is dependent on the shape of the feed channel, and also the heat generated by the silicon carbide.

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2. Basin Section

The temperature of the melt is reduced uniformly to the desired value after it has passed through the homogenizing unit. It is difficult to maintain a uniform and constant temperature for the gob of glass if the temperature in the basin cannot be controlled. Extremely high or low temperature will alter the shape of a glass gob and, ultimately, the quality of glass containers. The scientific method of controlling the basin is to do so separately. Basin heating can be classified into two types:

Then, two gun-type rods of silicon carbide and one rod with three sections are chosen to be placed around the basin.

The basin is heated by using two groove-type rods of silicon carbide and one rod with three sections.