Control of headbox stock characteristics
Abstract
Abstract THIS INVENTION IS DIRECTED TO APPARATUS FOR CONTROLLING THE CHARACTERISTICS OF STOCK DELIVERED TO A HEADBOX OF A PAPERMAKING MACHINE. THE STOCK OF DIFFERENT CONSISTENCIES ARE CONTAINED IN A PLURALITY OF STCK RESERVOIRS AND THE STOCK FROM EACH OF THE RESERVOIRS IS DELIVERED TO A MAIN STOCK CHAMBER WHERE THE STOCK IS MIXED TOGETHER TO FORM A STOCK OF A DESIRED CONSISTENCY. THE STOCK FROM THE MAIN STOCK CHAMBER IS THEN DELIVERED VIA A FLOW CONTROL VALVE TO A STOCK SCREENING APPARATUS WHERE THE STOCK IS FINALLY SCREENED BEFORE BEING DELIVERED TO A HEADBOX OF A PAPERMAKING MACHINE. THE TEMPERATURE OF THE STOCK IS MEASURED PRIOR TO THE STOCK ENTERING THE SCREENING APPARATUS, AND THE PRESSURE DROP OF THE STOCK PASSING THROUGH THE APPARATUS IS MEASURED. THE MEASURED PRESSURE DROP AND TEMPERATURE OF THE STOCK IS THEN COMPUTED TO DEVELOP CONTROL SIGNALS TO CONTROL T HE FLOW OF STOCK TO THE SCREENING APPARATUS THEREBY MAINTAINING THE STOCK DELIVERED TO THE HEADBOX AT A DESIRED CHARACTRISTIC. D R A W I N G
Inventors
- 👤 Salomon M Salomon
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |