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A tunnel kiln is a steady proceeding ware kiln. In which the clay products to be fired are moved on a conveyor belt via a long horizontal tunnel.
Kilns are containers for heat. In the most primitive forms, a trench or a pit is dug into the earth. Nowadays, there are numerous types of kilns, many of which are utilized for pottery and the ceramic arts too.
The fire is placed in the center and the brick gradually moves through the tunnel on a train or a conveyor belt, so that clays products which are at the front of the tunnel are gradually being preheated by the fire further on, and bricks that have passed the fire are permitted to cooldowns slowly. It is constructed in a circular or oval shape.
1. Advantages of Tunnel Kiln
The advantages of a tunnel kiln are as follows:
a. Needs low maintenance
b. Need less manual labor to work, freeing up employees.
c. The cost per piece investment cost in the case of energy and equipment is less for high volume use.
2. Disadvantages of Tunnel Kiln
The disadvantages of tunnel kiln are as follows:
a. Lack of airtightness
b. Heat losses by thermal conduction
c. Limitations in product mass and kiln width, as well as inconsistent product tracking.
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