Heating – Processes of heating or heater operation – Treating an article – container – batch or body as a unit
Patent
1989-03-31
1990-10-30
Bennet, Henry A.
Heating
Processes of heating or heater operation
Treating an article, container, batch or body as a unit
432128, 432 12, 432 18, 432 45, 432 43, F27B 900
Patent
active
049665472
ABSTRACT:
The invention relates to the control of a tunnel furnace partitioned into a plurality of zones for heat treatment of, e.g., ceramic or glass workpieces. As usual the temperatures of the respective zones are controllable individually. Furthermore, in each of selected zones the temperature of that zone is varied from a first level to a second level during the stay of each workpiece in that zone and returned to the first level in a predetermined time after letting the workpiece out of that zone, and the length of stay of each workpiece in that zone is controlled such that another workpiece can be introduced into that zone while the preceding workpiece stays in the next zone and such that a number of workpieces can be heat treated in succession under the same time-temperature conditions.
REFERENCES:
patent: 3248517 (1966-04-01), Vranken
patent: 3261596 (1966-11-01), Bowman
patent: 3463465 (1967-11-01), Fuller
patent: 3982887 (1976-09-01), Kendziora et al.
patent: 4340361 (1982-07-01), Tanaka et al.
patent: 4518353 (1985-05-01), Banno et al.
patent: 4790749 (1988-12-01), Mauro
Okuyama Takashi
Yamauchi Yutaka
Bennet Henry A.
Central Glass Company Limited
Kilner C.
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