Clay brick making machine-Brick machine-Baoshen brick making machine

The steps of clay bricks manufacturing by Brick machinery (Step 4)

The next step is burning or firing the green brick. The green brick pass through the long length of the kiln
on a continuous procession of cars moving on rails, much like a small railroad train. The continuous tunnel
kiln employs a combination of vertical and horizontal drafts. The preheating, burning and cooling is done in
zones varying in temperatures up to 2,000 degrees. In this type of kiln, closer temperature control is possible
and less handling of the green brick results in better quality products.

When the green brick enters the kiln, the manufacturer determines the type of firing required to produce the
desired range of color. If a range of clear burn color is wanted, a straight burn from start to finish produces
the desired result. The only color variations being the extremes of dark color nearest the fire or in the crown
on the kiln and the light color at the bottom where the brick have the lowest temperature. The remainder of the
brick will have medium tones. However, if the kiln is designated to be flashed, the dampers are regulated at the
end of the burn to cut off the air and subject the brick to a reducing fire, thus bringing out the blacks, blues,
browns, etc. which make up a flashed range.