Claims
- 1. A batch-type kiln for performing firing treatments involving a de-waxing step and a firing step, comprising:(a) a kiln body; (b) a heating chamber disposed within the kiln body, the heating chamber having a heater disposed therein; (c) a table disposed at the bottom of the heating chamber, the table having a peripheral portion and an upper surface for supporting an object to be treated, the peripheral portion of the table and a portion of the kiln body defining a gap there between, the gap forming a gas-introducing path for introducing a first gas into the heating chamber, wherein the gap comprises a horizontal component and a vertical component continuous with each other; and (d) a plurality of gas supply tubes arranged concentrically with respect to the heating chamber for introducing a second gas into the heating chamber, each gas supply tube having a plurality of blow openings, wherein the first gas and the second gas are the same gas.
- 2. The batch-type kiln according to claim 1, wherein the peripheral portion of the table includes a step portion comprised of a horizontal surface and a vertical surface, the gas-introducing path being formed between a portion of the kiln body and the step portion.
- 3. The batch-type kiln according to claim 1, wherein the heater is at least partially covered with a heat-resistant insulating tube along an outer peripheral portion thereof.
- 4. The batch-type kiln according to claim 3, wherein a bottom end of the heat-resistant insulating tube is in contact with the bottom of the heating chamber, thereby preventing gas in the heating chamber from entering the tube.
- 5. The batch-type kiln according to claim 1, wherein the heater is spiral-shaped, rod-shaped, or U-shaped.
- 6. The batch-type kiln according to claim 1, wherein the kiln-body and the heating chamber are cylindrical in shape.
- 7. The batch-type kiln according to claim 6, wherein a plurality of heaters are arranged concentrically with respect to the heating chamber.
- 8. The batch-type kiln according to claim 1, further comprising means for raising and lowering the table.
- 9. The batch-type kiln according to claim 8, further comprising means for rotating the table.
- 10. The batch-type kiln according to claim 1, further comprising an annular gas supply inlet in communication with the gas-introducing path for introducing a gas therethrough.
- 11. The batch-type kiln according to claim 1, further comprising an air chamber circumscribing the kiln body, the air chamber having an annular air supply portion for introducing air into the air chamber.
- 12. The batch-type kiln according to claim 1, wherein the peripheral portion of the table includes a step portion comprised of a horizontal surface and a vertical surface, wherein the horizontal component and the vertical component of the gap are defined by a portion of the kiln body and the horizontal surface and the vertical surface, respectively.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8-56944 |
Feb 1996 |
JP |
|
Parent Case Info
This application is a continuation, of Application Ser. No. 08/800,068 filed Feb. 14, 1997, now U.S. Pat. No. 6,168,426.
US Referenced Citations (12)
Foreign Referenced Citations (5)
Number |
Date |
Country |
63-125793 |
Aug 1988 |
JP |
02-074567 |
Mar 1990 |
JP |
6-3062 |
Jan 1994 |
JP |
07-120162 |
May 1995 |
JP |
8-18233 |
Jan 1996 |
JP |
Continuations (1)
|
Number |
Date |
Country |
Parent |
08/800068 |
Feb 1997 |
US |
Child |
09/625857 |
|
US |