US3721014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for the drying of comminuted material
Assignee: G Siempelkamp GmbH and Co KG
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Filing: 1971-05-14
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Granted: 1973-03-20
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Expires: 1991-05-14
Abstract
Abstract A method of and an apparatus for the drying of comminuted material, especially wood particles and fibers and particles and fibers of cellulosic or plant materials in general, as may be used for the production of pressed board. The particulate mixture, including a fine component, a coarse component and at least one further component such as splinters, is subjected to gas classification to separate the fines from the coarse particles which are conveyed in respective hot-gas streams eventually to respective separators. In the separators, the particles are recovered from the cooled gas, part of which is returned to the hot-gas generator which the remainder or at least another part is mixed with the hot gases produced by this generator for recycling to the drying stage. The gas cycles of the fine and coarse stages may be operated independently.
Inventors
- 👤 P Voelskow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:43
CPC Classifications
F; F26; F26B; F26B3/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
35 words
The plant defined in claim 1 wherein said one of said separators is said second separator and said first separator is provided with means for venting a portion of its cool-gas stream from the plant.
Claim 2
Dependent Claim
76 words
The plant defined in claim 1 wherein each of said mixing means includes a branch duct connected to the respective conduit at a junction therewith and communicating with said one of said separators, and swingable-flap means at the respective junction for controlling the proportions of the hot gas derived from said generator means and the cool gas stream derived from said one of said separators which form the respective hot-gas stream supplied to the respective classifier.
Claim 3
Dependent Claim
32 words
The plant defined in claim 3 wherein said first chamber is connected upstream of said first classifier and is traversed by the entire mixture prior to its entry into said first classifier.
Claim 4
Dependent Claim
37 words
The plant defined in claim 4 wherein said second chamber is provided upstReam of said second classifier and between the latter and the first classifier for traversal by said mixture following removal of said fine component therefrom.
Claim 5
Dependent Claim
23 words
The plant defined in claim 3 wherein said mixture is introduced first into said classifiers and the particles then pass into said chambers.
Claim 6
Dependent Claim
32 words
The plant defined in claim 3, further comprising a mill connected to said first separator for comminuting the fine component upon its separation from the cool gas stream in said first separator.
Claim 7
Dependent Claim
71 words
The plant defined in claim 7 wherein said plant has an inlet for feeding said mixture to said classifiers, chamber and separators, said plant further comprising moisture detection means at said inlet for producing a signal representing the moisture content of said mixture, regulator means connected with said generator means for controlling combustion of a fuel to produce said hot gases, and means connecting said moisture-detection means with said regulator means.
Claim 8
Dependent Claim
56 words
The plant defined in claim 8, further comprising moisture-detection means at the output site of said separators and connected to the respective flap-type valves for controlling the mixing of the hot gas with the respective portion of the cool-gas stream from said one of said separators in accordance with the moisture content of the respective component.
Claim 9
Dependent Claim
24 words
The plant defined in claim 9 wherein the moisture-detection means of said first separator is provided at the discharge site of said milling means.
Claim 10
Dependent Claim
31 words
The plant defined in claim 9, further comprising respective thermostat means responsive to the temperature of the cool-gas streams at said separators and connected to said regulator means for controlling same.
Claim 11
Dependent Claim
38 words
The plant defined in claim 11 wherein the thermostat means each has a set point, further comprising means for adjusting said set points in accordance with the moisture contents of said components as determined by said moisture-detection means.
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |