The roller kiln for the firing of ceramic materials is formed by an open channel with a roller device where the material is passing. The material passes through the kiln crossing sections having different temperatures; the dwelling of ceramic material at given temperatures for given time intervals causes irreversible chemical-physical changes in the material structure, called “firing”. The temperature-time diagram is called “firing curve”, while the time taken by the material to cross the kiln is called “cycle”. The firing is associated to the mechanical resistance and hardness increase of the ceramic product, making it suitable for the intended use.
The roller kilns configurations change depending on the features and requirements of the products. This variation refers to the width of the loading mouth, to the air control system (fixed or modulated air), to the type of the used rollers (according to the reached temperatures), to the draft type and to the number of standard modules forming each kiln section.