Ipsen Ceramics Kilns
Periodic furnaces have temperature capabilities as high as 3,000 °F (1,650 °C), as well as controlled heating with the top soak temperature confirmed and set using an optical pyrometer. Ipsen Ceramics has a variety of periodic furnaces for accomodating both large and small batch operations.
The tunnel kiln temperatures range from 2,000 °F to 3,000 °F
(1,093 °C to 1,650 °C) with anything outside this range requiring special adjustments. The tunnel kilns are currently operated in index mode (as compared to continuous). In the index mode, a kiln car is pushed into the kiln at predetermined intervals. Push times can range from 3 to 16 hours. Depending on the kiln and the push time, total kiln residence door-to-door time can range from 24 hours to five or more days.
Ipsen Ceramics currently runs four tunnel kilns. Three of the four tunnels have one heat zone of control. The fourth tunnel kiln has four zones of control to help meet your exact specifications. One of the advantages of tunnel kilns is their ability to provide larger campaign runs with higher temperature requirements. In addition, larger vessels and shapes can be accommodated by the wide range of kilns available.
Roller Hearth Kilns
Roller hearth kilns run on continuous cycles with precision firing controls to meet the most stringent profile requirements. These kilns can reach 2,400 °F (1,316 °C), with door-to-door time ranging from 90 minutes to eight hours. Depending on the roller hearth, the heat zone is 40 to 60 percent of the kiln, with the rest of the kiln being preheating and cooling areas.
The main advantages of roller hearth kilns are the uniformity and consistency of the fired product, the responsiveness to processing and temperature changes and the short residence time.
Depending on the material to be calcined, ceramic saggers composed of alumina, mullite, cordierite or fused silica can be used.