Rollover technique
The overlap technique is used in ceramics to build up large-format ceramic parts up to entire tiled stoves completely with soft clay and then to dismantle them again into individual tile parts during the drying process in order to obtain manageable pieces.
history
The overlap technique was invented in the early to mid-18th century in order to realize the sweeping forms of the Baroque and Rococo in the tiled stove area. At that time, the entire furnace was still built in its original size as a wooden frame, on which soft clay sheets were then placed ("knocked over").
Modern times
Today base bodies made of Styrofoam ( polystyrene foam ) are also used to make z. B. to manufacture ergonomically shaped ceramic benches.
Normal case
A bar framework made of clay is preferred, since it shrinks with the outer tile sheet during the drying process, thus avoiding the formation of cracks. Clay shrinks by up to 10% when it dries.
Procedure
First, a bridge structure is built from dried clay slabs, which determines the later shape. The interfaces at which the body is cut apart again after it has dried out are also defined here.
Soft clay sheets are then applied to this bar framework and adapted to the shape. This process is called rollover. As long as the clay sheet is still soft, it is now possible to decorate the surface with modeled motifs, frames, etc. If the body has sufficient stability due to drying, it is cut into the previously determined individual parts. These are processed as in normal tile production.
gallery
Bridge framework of a baroque dome
Soft clay sheet is garnished on the bar framework.
Cutting the dome into pieces
Finished baroque dome
Individual evidence
- ^ Eva Roth Heege: Oven ceramics and tiled stoves - typology, terminology and reconstruction in German-speaking countries. ISBN 978-3-908182-23-8 .