Paper machine couching box with a multiperforate surface
Abstract
Abstract A couching box for facilitating separation of a paper web from the forming wire includes means adapted to act momentarily on the moving wire and web to withdraw air and water from a supported area of the wire and web between the couch roll and the turning roll, and to release the web quickly and evenly from such action just prior to its separating from the web. This facilitates separation of the web, reduces stress on the paper, minimizes web breaks, and increases production efficiency. The couching box has a hard plane multiperforate surface which is separated from an imperforate surface by an intersecting groove. Vacuum for air and water removal from the web is effective through the multiperforate surface and in the groove.
Inventors
- 👤 W Hawkings
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |