PROBLEM TO BE SOLVED: To prevent occurrence of unevenness in temperature in a muffle and to perform uniform burning of a molded product by a method wherein the interior of the muffle is uniformly heated by high temperature gas introduced by a heat transferable pipe arranged at the muffle to contain the molded product placed on the truck. ;SOLUTION: A muffle truck 1 for a burning furance is formed movably over a rail arranged at a tunnel kiln. Further, a muffle 3 composed of a bottom plate and side wall formed of refratory bricks is arranged on a truck base body 2 of a maffule truck 1, and a heat transfer pipe 4 is extended in a direction orthogonally to a running direction at the lower part of the muffle 4. In this way, high temperature gas is introduced to the internal part of the heat transfer pipe 4. The heat transfer pipe 4 brings the interior of the muffle 3 into a uniform temperature by the heat of high temperature gas, and a molded product 26 contained in the muffle 3 is uniformly burnt. Accordingly, it is preferable that the heat transfer pipe 4 uses a ceramics pipe being excellent in thermal conductivity.;COPYRIGHT: (C)1999,JPO
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