GB439952A - Improved controlled withering of tea - Google Patents
Improved controlled withering of teaInfo
- Publication number
- GB439952A GB439952A GB1742234A GB1742234A GB439952A GB 439952 A GB439952 A GB 439952A GB 1742234 A GB1742234 A GB 1742234A GB 1742234 A GB1742234 A GB 1742234A GB 439952 A GB439952 A GB 439952A
- Authority
- GB
- United Kingdom
- Prior art keywords
- air
- loft
- damper
- needle
- hygrometer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/20—Teas, i.e. drying, conditioning, withering of tea leaves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Abstract
439,952. Withering tea. MAIN, J. A., Vincent House, Vincent Square, Westminster. June 12, 1934, No. 17422. [Class 34 (ii)] In a method of withering tea in a loft, air is circulated through the loft and its hygrometric state at entry is controlled to maintain as nearly as possible a predetermined ability to take up moisture at a point reached after passing the whole or a predetermined portion of the leaf in the loft, the arrangement being such that, if the air supplied in the moistest of three or more alternative conditions gives a moisture-absorbing capacity below that predetermined at the point in question, a correction is applied causing drier but not substantially warmer air to be admitted, and if after this correction has been applied, the moisture-absorbing capacity is still below that predetermined at the point in question, a correction of a different kind is applied still causing the air admitted to be drier whether or not it is warmer. In the arrangement shown in Fig. 1, a hygrometer 1 is situated at the entrance to a duct 2 through which air issues from a withering loft 3. The duct is formed with a branch 4 divided into two parts 5, 6. A damper 7 is normally maintained in the position shown so that air may issue from the loft through the outlet 5 and fresh air be drawn in through inlet 6 and ducts 10, 9. The duct 10 is provided with a damper 12 normally vertical. The dampers 7, 12 are adapted to be controlled by devices 8, 14, each containing a relay-controlled solenoid which when energized moves the associated damper to a position at right angles to its normal position. When the air in the loft is too dry the hygrometer needle 15 touches a contact 18 thereby completing a circuit to operate the device 8 so that the damper 7 is moved to the position 7<1>. The air in the loft is thus caused to be re-circulated, passing through ducts 2, 10, 9. When the moisture from the leaf raises the humidity of the air the needle 15 leaves contact 18 so that the damper 7 returns to its normal position. If the air in the loft is too humid, the needle 15 engages contacts 16, 17 whereby both dampers 7, 12 are operated so that air issuing from the loft passes through a drying plant 13 before being returned to the loft. In the arrangement shown in Fig. 2, fresh air is used all the time. The hygrometer 1 is situated in the loft where the humidity of the air is likely to be fairly constant, and the direction of circulation of the air through the loft is periodically reversed. Fresh air enters the loft through inlet 20, and may be mixed with dried air by opening a damper 21 associated with a drying plant 13, or with heated air by opening a damper 22 associated with a heater 23. The dampers 21, 22 are controlled respectively by devices 24, 25, which are electrically operated as in the arrangement shown in Fig. 1. When the air in the loft is too dry the hygrometer needle 15 touches contact 26 whereby the device 24 is operated to close damper 21 and prevent admission of dry air. If the air is too humid the needle 15 touches contact 27 whereby the device 25 is operated to open the damper 22 and allow hot air to enter the loft.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1742234A GB439952A (en) | 1934-06-12 | 1934-06-12 | Improved controlled withering of tea |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1742234A GB439952A (en) | 1934-06-12 | 1934-06-12 | Improved controlled withering of tea |
Publications (1)
Publication Number | Publication Date |
---|---|
GB439952A true GB439952A (en) | 1935-12-12 |
Family
ID=10094925
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1742234A Expired GB439952A (en) | 1934-06-12 | 1934-06-12 | Improved controlled withering of tea |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB439952A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2194029B (en) * | 1986-07-01 | 1989-12-20 | Andrews Group Plc | Grain dryer |
GB2239305A (en) * | 1989-12-23 | 1991-06-26 | Myron Grant Hampton | Drying tea |
-
1934
- 1934-06-12 GB GB1742234A patent/GB439952A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2194029B (en) * | 1986-07-01 | 1989-12-20 | Andrews Group Plc | Grain dryer |
GB2239305A (en) * | 1989-12-23 | 1991-06-26 | Myron Grant Hampton | Drying tea |
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