US4272894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying step in a method of producing ceramic articles
Assignee: Salviati Impianti SpA
•
Filing: 1979-03-21
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Granted: 1981-06-16
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Expires: 1999-03-21
Abstract
Abstract A method of drying green ceramic articles with a hot air stream in a drier, wherein the green articles, immediately or soon after entering the drier, are heated to 100° C. while the moisture content thereof is maintained equal to that of the green articles at the beginning of heating step.
Inventors
- 👤 Antonio Salviati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:31
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
148 words
A method of drying green ceramic articles in a continuous tunnel drier comprising the steps of introducing the green ceramic articles into the tunnel drier, conveying the ceramic articles through a water bath where they are heated to a temperature of 40° to 100°, removing the ceramic articles from the water bath, heating the green ceramic articles in the drier to a drying temperature while maintaining them at a moisture content substantially equal to that existing at the beginning of the heating steps; and drying the green articles previously heated; said heating and drying steps being carried out by passing a stream of hot air in co-current relationship with the green ceramic articles entering the tunnel drier, said stream of hot air having a temperature of from 120° to 140° C. and a moisture content of from 48 to 850 g of water per kg of dry air.
Claim 2
Independent Claim
148 words
A method of drying green ceramic articles in a continuous tunnel drier comprising the steps of introducing the green ceramic articles into the tunnel drier, conveying the ceramic articles through a water bath where they are heated to a temperature of 40° to 100°, removing the ceramic articles from the water bath, heating the green ceramic articles in the drier to a drying temperature while maintaining them at a moisture content substantially equal to that existing at the beginning of the heating steps; and drying the green articles previously heated; said heating and drying steps being carried out by passing a stream of hot air in co-current relationship with the green ceramic articles entering the tunnel drier, said stream of hot air having a temperature of from 120° to 140° C. and a moisture content of from 48 to 850 g of water per kg of dry air.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein the ceramic articles are heated to a temperature of 40° to 100° C. by said stream of hot air.
Claim 4
Dependent Claim
31 words
The method of claim 1 wherein the stream of hot air at least partially includes exhaust air which has been discharged from the drier, heated and recycled to the drier inlet.
Claim 5
Dependent Claim
27 words
The method of claim 1 wherein the temperature and humidity control of the drying air is facilitated by injecting water vapor and/or atomized water into the drier.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein the hot air was supplied at a flow rate of about 10 m 3 /min.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |