US3619362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Papermaking headbox stock nozzle with liquid jacket means for elimination of stock exposure to air
Assignee: Beloit Corp
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Filing: 1969-02-03
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Granted: 1971-11-09
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Expires: 1989-02-03
Abstract
Abstract A twin wire paper forming machine including a headbox having a stock outlet nozzle for directing a stream of stock into the forming nip of the machine. A liquid jacket means disposed on opposite sides of the stock nozzle discharges a stream of liquid into contiguous relation with the stock stream between the outlet of the stock nozzle and the nip to prevent exposure of the stock to ambient air. The stock outlet nozzle comprises wall members which include stationary and moveable portions, the area between the moveable portion of the outlet nozzle and the liquid jacket means varying as a function of the stock pressure in the outlet nozzle and liquid pressure in the liquid jacket means.
Inventors
- 👤 Joseph D Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:54
CPC Classifications
D; D21; D21F; D21F9/00; D21F9/003
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
41 words
In a twin-wire paper forming machine as defined in claim 1 wherein the nozzle wall means comprise a pair of spaced wall members having mutually facing inner wall surface forming a generally biconvexly shaped zone immediately upstream of the nozzle outlet.
Claim 2
Dependent Claim
64 words
In a twin-wire paper forming machine as defined in claim 1 wherein the liquid jacket means comprises a pair of spaced parallel jacket wall members disposed respectively on opposite sides of the nozzle wall means and in spaced relation thereto including flexible seal means connected to said jacket wall members for providing a liquid seal between said jacket wall members and said breast rolls.
Claim 3
Dependent Claim
48 words
In a twin-wire pAper forming machine as defined in claim 3 wherein the flexible seal means comprise a pair of flexible aprons extending from the jacket wall members into sealing relation with the forming wires entrained around the breast rolls and beyond the outlet of the nozzle outlet.
Claim 4
Dependent Claim
79 words
In a twin-wire paper forming machine as defined in claim 3 wherein the flexible seal means comprise a pair of flexible aprons extending respectively from said jacket wall members into the nip between the breast rolls and into sealing engagement with said forming wires entrained around said breast rolls on the upstream side of the narrow of said gap and extending at least to the narrow of said gap whereat the space between the breast rolls is the least.
Claim 5
Dependent Claim
30 words
In a twin-wire paper forming machine as defined in claim 5 wherein the flexible aprons extend beyond the narrow of the gap in sealing engagement with their respective forming wires.
Claim 6
Dependent Claim
44 words
In a twin-wire paper forming machine as defined in claim 5 wherein spacer means are attached to the nozzle outlet between the outlet thereof and the flexible aprons, said spacer means having outer surfaces generally conforming with the inner surfaces of the flexible aprons.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |