Production Process - Short description
After extraction from quarries, the clay raw material is laid out in order to obtain a homogeneous mixture.
Several stages are involved in preparing the clay. It is stockpiled , then crushed to attain the required grain size and then stockpiled again for several days or even months.
Before processing, the moisture content is controlled and it may be necessary to add water to obtain the right consistency for forming. Materials such as sawdust or residue of paper industry can be added to increase the porosity of the final product.
For bricks, the clay is extruded or moulded to obtain the shape required and then cut to size. In roof tilemaking, the clay can undergo a two-stage process, the second of which may occur after extrusion, depending on the roof tile being manufactured. For example, for interlocking tiles, the extruded clay is pressed between two moulds.
The formed clay is dried in order to reduce its moisture content and then loaded into
kilns for firing. When this is completed and the products have cooled, they are packed
ready for dispatch. Throughout all stages of production, the process is subject to
rigourous quality control.
|Example of Production of
extruded bricks and handmade bricks
|Example of production of pressed roofing tiles|
© TBE-Europe 2005