US3769153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Papermaking machine headbox with multiple stiff, vibrational rods or plates extending downstream in the slice chamber
Assignee: Beloit Corp
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Filing: 1971-03-19
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Granted: 1973-10-30
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Expires: 1991-03-19
Abstract
Abstract A headbox structure for feeding a slurry of stock onto a traveling forming surface for a paper making machine including a tapering slice chamber with cantilever supported self-supporting, self-exciting vibrational rods or plates cantilever supported at their upper end and extending in a downstream direction within the slice immediately ahead of the slice opening and operational to reduce the network strength between the fibers as they are delivered onto the traveling forming surface.
Inventors
- 👤 L Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:25
CPC Classifications
F; F16; F16L; F16L39/00; D; D21; D21F; D21F1/00; D21F1/02; D21F1/028
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
29 words
In a headbox structure for feeding a slurry of stock onto a traveling forming surface constructed in accordance with claim 1 wherein said self-exciting members are of different lengths.
Claim 2
Dependent Claim
34 words
In a headbox structure for feeding a slurry of stock onto a traveling forming surface constructed in accordance with claim 1 wherein certain of said self-exciting members are of a different thickness than others.
Claim 3
Dependent Claim
66 words
In a headbox structure for feeding a slurry of stock onto a traveling forming surface constructed in accordance with claim 1, the combination wherein said support means is in the form of a plate extending across the entry end of the slice chamber and a plurality of flow openings are provided through said plate for the flow of stock from the headbox to the slice chamber.
Claim 4
Dependent Claim
47 words
In a headbox structure for feeding a slurry of stock onto a traveling forming surface constructed in accordance with claim 4, the combination wherein certain of said members are arranged in an annular pattern each around said openings on the plate and the openings are substantially circular.
Claim 5
Dependent Claim
42 words
In a headbox structure for feeding a slurry of stock onto a traveling forming surface constructed in accordance with claim 1, the combination wherein said members comprise rods which are substantially circular in cross-section and are of uniform thickness along their length.
Claim 6
Dependent Claim
47 words
In a headbox structure for feeding a slurry of stock onto a traveling forming surface constructed in accordance with claim 1, the combination wherein said slice chamber is uniformly tapered to be of maximum height at the entry end and of minimum height at the slice opening.
Claim 7
Dependent Claim
53 words
In a headbox structure for feeding a slurry of stock onto a traveling forming surface constructed in accordance with claim 7, the combination wherein certain of said members are of different length and the members adjacent the upper and lower walls of the slice chamber are of less length than the members therebetween.
Claim 8
Dependent Claim
54 words
In a headbox structure for feeding a slurry of stock onto a traveling forming surface constructed in accordance with claim 8, the combination wherein the length of the members is such that the distance from the tips of different members to the upper and lower walls of the slice decreases in a downstream direction.
Claim 9
Dependent Claim
30 words
In a headbox structure for feeding a slurry of stock onto a traveling forming surface constructed in accordance with claim 1 wherein said vibrational members have an enlarged bulbous end.
Claim 10
Independent Claim
103 words
The method of reducing the network strength between fibers in a stock slurry of dispersed fibers in a liquid carrier being fed from a headbox onto a traveling forming surface through a slice chamber which comprises positioning a plurality of thin self-supporting, self-exciting vibrational members having sufficient rigidity so that their general position is independent of stock flow and being self-supporting along their entire length in the slice chamber immediately ahead of the slice opening, and supporting them cantileverly at their upstream ends to extend substantially parallel to the flow in a downstream direction so that they vibrate and reduce said network strength.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |