US3873416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for the continuous measurement of the weight-average fiber length of a pulp
Assignee: Individual
•
Filing: 1973-10-03
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Granted: 1975-03-25
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Expires: 1993-10-03
Abstract
Abstract A method and apparatus are disclosed which permit the ''''online'''' measuring of the properties of a pulp, notably the weightaverage fibre length of a mechanical pulp. The pulp is passed through a specially devised stock fractionator and the readings or signals from this instrument are used, e.g., in a suitably programmed computing device, to obtain the value of the weightaverage fibre length of the pulp. The stock fractionator used is a self-cleaning screen of a suitable mesh size by means of which the pulp is split into a retained fraction of a through fraction. The weight ratio of one of the fractions to the feed is related to the L-factor of the pulp.
Inventors
- 👤 Otto L Forgacs
- 👤 Alkibiadis Karnis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:27
CPC Classifications
D; D21; D21G; D21G9/00; D21G9/0009; D21G9/0018; Y; Y10; Y10S; Y10S162/00; Y10S162/09; Y10S162/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
THE CONTINUOUS METHOD OF PROVIDING A MEASUREMENT OF WEIGHT-AVERAGE FIBRE LENGTH OF A PULP COMPRISING FEEDING A PULP SUSPENSION TO A FRACTIONATOR, DIVIDING SAID PULP INTO A RETAINED FRACTION AND A THROUGH FRACTION IN SAID FRACTIONATOR, MEASURING THE FLOW AND CONSISTENCY OF SAID SUSPANSION, MEASURING THE FLOW AND CONSISTENCY OF ONE OF SAID FRACTIONS THEREBY TO OBTAIN A RATIO BY WEIGHT OF SOLIDS IN SAID SUSPENSION AND IN SAID ONE FRACTION, SAID RATIO BEING AN INDIRECT MEASURE OF THE WEIGHT AVERAGE FIBRE LENGTH OF SAID PULP.
Claim 2
Dependent Claim
86 words
THE CONTINUOUS METHOD OF PROVIDING A MEASUREMENT OF WEIGHT-AVERAGE FIBRE LENGTH OF A PULP COMPRISING FEEDING A PULP SUSPENSION TO A FRACTIONATOR, DIVIDING SAID PULP INTO A RETAINED FRACTION AND A THROUGH FRACTION IN SAID FRACTIONATOR, MEASURING THE FLOW AND CONSISTENCY OF SAID SUSPANSION, MEASURING THE FLOW AND CONSISTENCY OF ONE OF SAID FRACTIONS THEREBY TO OBTAIN A RATIO BY WEIGHT OF SOLIDS IN SAID SUSPENSION AND IN SAID ONE FRACTION, SAID RATIO BEING AN INDIRECT MEASURE OF THE WEIGHT AVERAGE FIBRE LENGTH OF SAID PULP.
Claim 3
Dependent Claim
83 words
A continuous method of providing a measurement of the weight-average fibre length of a pulp comprising feeding a pulp suspension to a fractionator, dividing said pulp into a retained fraction and a through fraction in said fractionator, measuring the flow and consistency of each of said retained and said through fractions thereby to obtain a ratio by weight of solids in said retained fraction and said through fraction said ratio being an indirect measure of the weight average fibre length of said pulp.
Claim 4
Dependent Claim
83 words
A continuous method of providing a measurement of the weight-average fibre length of a pulp comprising feeding a pulp suspension to a fractionator, dividing said pulp into a retained fraction and a through fraction in said fractionator, measuring the flow and consistency of each of said retained and said through fractions thereby to obtain a ratio by weight of solids in said retained fraction and said through fraction said ratio being an indirect measure of the weight average fibre length of said pulp.
Claim 5
Independent Claim
97 words
An apparatus for measuring the weight-average fibre length of a pulp comprising a stock fractionating means including a selfcleaning screen, means to feed a pulp suspension to said selfcleaning screen to fractionate saId pulp into a retained fraction and a through fraction, means for measuring the flow and consistency of said suspension, means for measuring the flow and consistency of one of said fractions thereby to obtain a ratio by weight of solids in said suspension and said one of said fractions, said ratio being an indirect measure of the weight average fibre length of said pulp.
Claim 6
Independent Claim
97 words
An apparatus for measuring the weight-average fibre length of a pulp comprising a stock fractionating means including a selfcleaning screen, means to feed a pulp suspension to said selfcleaning screen to fractionate saId pulp into a retained fraction and a through fraction, means for measuring the flow and consistency of said suspension, means for measuring the flow and consistency of one of said fractions thereby to obtain a ratio by weight of solids in said suspension and said one of said fractions, said ratio being an indirect measure of the weight average fibre length of said pulp.
Claim 7
Dependent Claim
30 words
The apparatus as defined in claim 3 wherein said apparatus further comprises means for deriving the ratio of solids in said suspension to solids in said one of said fractions.
Claim 8
Dependent Claim
23 words
An apparatus as defined in claim 4 wherein said selfcleaning screen is substantially vertically mounted and further comprising means to vibrate said screen.
Claim 9
Independent Claim
99 words
An apparatus for measuring the weight average fibre length of a pulp comprising a stock fractionating means including a selfcleaning screen, means to feed a pulp suspension to said selfcleaning screen to fractionate said pulp into a retained fraction and a through fraction, means for measuring the flow and consistency of said retained fraction, means for measuring the flow and consistency of said through fraction thereby to obtain a ratio by weight of solids in said retained fraction to solids in said through fraction, said ratio being an indirect measure of the weight average fibre length of said pulp.
Claim 10
Independent Claim
99 words
An apparatus for measuring the weight average fibre length of a pulp comprising a stock fractionating means including a selfcleaning screen, means to feed a pulp suspension to said selfcleaning screen to fractionate said pulp into a retained fraction and a through fraction, means for measuring the flow and consistency of said retained fraction, means for measuring the flow and consistency of said through fraction thereby to obtain a ratio by weight of solids in said retained fraction to solids in said through fraction, said ratio being an indirect measure of the weight average fibre length of said pulp.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |