Patent US3630836A successfully refreshed from Google Patents.
US3630836A
Expired / Lapsed
US
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Controlling the cutting to hydration ratio in the refining of pulp
Assignee: Eastman Kodak Co
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Filing: 1969-10-03
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Granted: 1971-12-28
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Expires: 1989-10-03
Abstract
Abstract The quality of paper being manufactured is maintained constant by keeping the cutting to hydration ratio of pulp stock during refining constant. The drying rate of the paper is an indication of the cutting to hydration ratio of the refined pulp stock. The drying rate is compared with a desire drying rate and the difference therebetween is used to adjust the refining so that the actual cutting to hydration ratio is maintained the same as the desired cutting to hydration ratio.
Inventors
- 👤 Charles R Bietry
- 👤 Earl D Hogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:00
CPC Classifications
D; D21; D21G; D21G9/00; D21G9/0009; D21G9/0018; Y; Y10; Y10S; Y10S162/00; Y10S162/09; Y10S162/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
28 words
The system of claim 1 wherein: a. said adjustable means is a pulp refiner, and b. said signal is applied to adjust said pulp refiner in proportion thereto.
Claim 2
Dependent Claim
67 words
The system of claim 1 wherein said signal producing means includes: a. means for producing a signal that varies directly with the drying rate for said stock, b. means providing a drying rate reference signal, and c. means producing a signal dependent on the difference between said signal that varies directly with said drying rate and said reference signal, said difference dependent signal being said control signal.
Claim 3
Dependent Claim
61 words
The apparatus of claim 3 wherein said system includes a plurality of stock drying means, and said means for producing a signal that varies directly with said drying rAte produces a signal that varies directly with the drying rate for said stock at at least one of said stock drying means which precedes that drying means where said stock becomes dry.
Claim 4
Dependent Claim
42 words
The system of claim 3 wherein said signal that varies directly with said drying rate is a signal that varies as a direct function of the rate of drying for said stock and as an inverse function of the stock drying temperature.
Claim 5
Dependent Claim
42 words
The system of claim 4 wherein said signal that varies directly with said drying rate is a signal that varies as a direct function of the rate of drying for said stock and as an inverse function of the stock drying temperature.
Claim 6
Dependent Claim
91 words
In combination with a paper making machine having a jordan, a paper forming means, and stock drying means, a. means for producing a signal that varies directly with the rate at which said stock is dried by said drying means, b. means providing a drying rate reference signal, c. means for comparing said reference signal and said signal that varies directly with said drying rate to produce a control error signal, and d. means for use in adjusting said jordan in proportion to the magnitude of the said control error signal.
Claim 7
Independent Claim
79 words
The method of controlling paper quality comprising the steps of a. refining pulp into stock, b. feeding said refined stock through a paper forming means, c. drying said stock to form paper, d. determining the drying rate for said stock relative to a desired drying rate that is compatible with a certain quality paper, and e. regulating the refining of said pulp so that the actual drying rate for said stock is the same as said desired drying rate.
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |