Manufacture of cellulosic fluffed sheet
Abstract
Abstract A METHOD FOR PRODUCTION OF AN ABSORBENT, SOFT, LIMP CELLULOSIC FIBROUS BODY HAVING LAYERS OF DIFFERENTIAL ABSORPTION CHARACTERISTICS IN WHICH A WET CELLULOSIC BATT WITH A MOISTURE CONTENT OF AT LEAST 30% IS TREATED WITH A DILUTE AQUEOUS SOLUTION OF CELLULOSIC DEBONDING AGENT SUCH AS A QUATERNARY AMMONIUM SALT SO AS TO PENETRATE ONLY A SURFACE ZONE OF THE BATT AND TO LESSEN TO COHERENCE OF THE FIBERS FOR EACH OTHER IN THIS ZONE. THE BATT IS DRIED TO A CONSISTENCY OF AT LEAST 85% IN THE ABSENCE OF SUBSTANTIAL POSITIVE PRESSURE, AND THEN TO FURTHER OPEN THE FIBERS IN THE SURFACE ZONE. THE BATT IS FLEXED ABOUT AN AXIS TRANSVERSE TO ITS LENGTH AND SUBJECTED TO A STREAM OF NONREACTIVE GAS. THE BATT INTEGRITY IS MAINTAINED THROUGHOUT THE PROCESS, WITH THE RESULTING BODY HAVING A DENSE ABSORBENT INNER ZONE AND A SOFTER MORE FLUID PERIOUS OUTER ZONE.
Inventors
- 👤 John F Champaigne
Bibliographic Details
Claims Analysis
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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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |