US3627630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of flash drying pulp
Assignee: Beloit Corp
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Filing: 1969-12-04
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Granted: 1971-12-14
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Expires: 1989-12-04
Abstract
Abstract A method of producing pulp bales suitable for storage and repluping comprising fluffing dewatered paper stock, intermixing the stock with a heated gas to partially dry the stock, refluffing the partially dried stock, intermixing the fluffed stock with a heated gas to finish drying the stock and converting the dried stock into a pulp bale.
Inventors
- 👤 Lawrence F Gagnon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:03
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/18; D21C9/185
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
27 words
The method as defined in claim 1 wherein the heated gas stream at step (5) is at a lower temperature than the gas stream at step (3).
Claim 2
Dependent Claim
48 words
The method as defined in claim 1 wherein steps (2) and (4) comprise passing dewatered stock between opposed close-running attrition surfaces having opposed elongated working edges in a radial plane along said surfaces and being angularly irregularly displaced from one another at different radial positions along said surfaces.
Claim 3
Dependent Claim
132 words
In a method of producing flash dried pulp bales, the steps comprising (1) providing a relatively low solid consistency fibrous stock, (2) increasing the solid consistency thereof to about 3 percent to 50 percent, (3) fluffing said stock to reduce the average fiber bundle size therein and reduce the average density of said stock, (4) intermixing said fluffed stock with a stream of heated air to evaporate moisture therefrom and increase the solid consistency thereof to about 60 percent to 75 percent, (5) refluffing said stock to further reduce the average fiber bundle size therein, (6) intermixing said fluffed partially dried stock with a stream of heated air to evaporate moisture therefrom and increase the solid consistency of about 80 percent to 95 percent and (7) converting said stock to pulp bales.
Claim 4
Independent Claim
201 words
A method of producing a flash dried pulp bale suitable for storage and repulping comprising, (1) providing a pulp stock having a solids consistency of about 3 percent to 25 percent, (2) fluffing said stock between opposed close-running attrition surfaces having opposed working edges in a radial plane along said surfaces for reducing the average fiber bundle size while preventing intermeshing of fibers to produce a fluffed nonmeshed fibrous mass, (3) intimately mixing said fibrous mass with a stream of air at a temperature causing flash evaporation of moisture and removing vaporized moisture from said mass to achieve a solids consistency of about 60 percent to 75 percent, (4) refluffing said stock between opposed close-running attrition surfaces having opposed working edges in a radial plane along said surfaces for reducing the average fiber bundle size while preventing intermeshing of fibers to produce a fluffed nonmeshed fibrous mass, (5) intimately mixing said fibrous mass with a stream of air at a temperature below the aforesaid temperature but sufficient to cause flash evaporation of moisture and removing vaporized moisture from said mass to achieve a solids consistency of about 80 percent to 95 percent and (6) converting said mass to a pulp bale.
Claim 5
Dependent Claim
26 words
The method as defined in claim 4 wherein a chemical suitable for pulp preparation is added to the fluffed stock at the beginning of step (5).
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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |