Method of producing high yield pulp by disc refining at ph of 12 to 14
Abstract
Abstract BONDING BETWEEN THE FIBERS IN FIBER BUNDLES OF HIGH YIELD PULP PRODUCED BY HOT DEFIBRATION BECOMES WEAKENED AND DISRUPTED WITHOUT CAUSING ANY LONGITUDINAL SPLITTING OR TRANSVERSAL BREAKING OF FIBERS, WHEN THE MATERIAL IS IMPREGNATED WITH AN AQUEOUS ALKALINE MEDIUM HAVING A PH OF FROM 12 TO 14 AND THE IMPREGNATED MATERIAL IS SUBJECTED TO COMPRESSIVE STRESS SUBSTANTIALLY PERPENDICULAR TO THE COMMON DIRECTION OF THE FIBER AXES IN THE BUNDLES AND SIMULTANEOUSLY TO SHEARING STRESS SUBSTANTIALLY IN THAT DIRECTION, SAID SHEARING STRESS BEING SUFFICIENT AT LEAST TO LOOSEN THE BOND BETWEEN THE FIBERS OF THE BUNDLE. THE TREATED MATERIAL MAY THEREAFTER BE SUBJECTED TO A CONVENTIONAL BEATER OR REFINER TREATMENT SO AS TO FIBRILLATE THE INDIVIDUAL FIBERS COMPLETELY, IF NECESSARY, AND STRONG PAPER CONTAINING NO FIBER BUNDLES CAN BE MADE FROM THE SO TREATED MATERIAL.
Inventors
- 👤 Yuichiro Sumi
- 👤 Yukio Sawaguchi
- 👤 Makoto Nagata
- 👤 Masayoshi Ninomiya
- 👤 Tadayoshi Nomura
Bibliographic Details
Claims Analysis
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |