a Plastic Clay Machines: Such machines contain a rectangular opening of size equal to length and width of a brick. The pugged clay is placed in the machine and as it comes out through the opening it is cut into strips by wires fixed in frames. The arrangement is made in such a way that strips of thickness equal to that of the brick are obtained.
This means your soil is 50% sand 12½% silt and 37½% clay. Preparing Your Mold. Your mold should be the standard size of a brick: 4x10x14 inches. You can make molds that produce multiple bricks or one that produces a single brick. The key requirement though will be to make your molds from wood.
Scrape off the excess clay. 5. Remove the mold and allow the newly made brick or green brick to dry at room temperature for 3 to 4 weeks. Turn “green bricks” at regular intervals to prevent warping and cracking. 6. Pre-heat the gas kiln for 2 hours setting it at 98 o C. Stack the bricks in “tie-tricks” formation. Fire for 16 hours.
Preparation of clay for bricks manufacturing is done in six steps: Unsoiling of clay We need pure clay for the preparation of bricks. The top layer of soil may contains impurities so the clay in top layer of soil about 200mm depth is thrown away.
Mix the ground clay soil with water to make a thick malleable paste. Traditionally clay bricks were molded by hand or with wooden tools. Today many clay bricks are made in purpose-built molds. Whichever molding method you use aim to produce clay bricks of the same size and shape.