Firing brick

When brick are made the clay is fired in a kiln. The stiff mud process involves taking clay that is just wet enough to stick together and pressing it into  shape.
Brick being fired in a traditional kiln

 The dry press method is where uses much stiffer mud is compressed under high pressure to form the brick, dense.
After being formed and shaped these "green brick "are allowed to dry to remove moisture content before being fired.
After being allowed to dry the brick are fired in a kiln. Kilns come in a variety of styles and forms. Ranging from traditional 
Brick being made at the factory
There are many designs of brick kilns in use throughout the world and most are capable of giving good results. Modern brick production can manufacture brick in a vast array of sizes and forms