|Monthly Tech-Tip |
The lid of my firing kiln seems to be just the right environment for even drying, even of freshly thrown pieces. By the time this mug really got under way here the kiln was at 1000F and the lid was getting pretty hot. The bottom was the warmest and the top coolest, the exact opposite of how drying normally becomes uneven (the top drying first). This principle could be employed to make a heated drying chamber. The interior space could be kept at high humidity and a draft of air through it could remove humid air and the needed rate.
Drying Ceramics Without Cracks
Anything ceramic ware can be dried if it is done slowly and evenly enough. To dry faster optimize the body recipe, ware cross section, drying process and develop a good test to rate drying performance.
In ceramics, drying performance is very important to optimizing production. More plastic clays shrink more and crack more, but they are also better to work with.