US4396502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screening apparatus for a papermaking machine
Assignee: GL&V Management Hungary Kft
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Filing: 1982-03-18
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Granted: 1983-08-02
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Expires: 2002-03-18
Abstract
Abstract A screen apparatus for processing stock flowing into a papermaking headbox which includes a cylindrical housing, a tubular screen mounted longitudinally within the housing, and inlet means for introducing a stock suspension into the housing for flow through the screen. Outlet means are provided for receiving the suspension passing through the tubular screen for delivery to the headbox. The improvement of the present invention provides a helical slot in the housing which discharges stock passing through the screen into the outlet means. Foil means mounted for rotation coaxially with the cylinder are provided which create a pressure pulsation to cause a dispersal of the fibers and aid in the screening operation.
Inventors
- 👤 Edgar J. Justus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:16
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/02; D21D5/023; D21D5/026; B; B01; B01D; B01D29/00; B01D29/11; B01D29/117; B01D29/118; B01D29/62; B01D29/70; B01D29/72; B07; B07B; B07B1/00; B07B1/18; B07B1/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
A screen apparatus for processing stock flowing to a papermaking headbox comprising: a cylindrical housing, a tubular screen mounted longitudinally within said housing, inlet means for introducing a stock suspension into said housing for flow through said screen, outlet means receiving the suspension passing through said tubular screen for delivery to said headbox, said housing having a helical slot formed therein which discharges stock passing through said screen into said outlet means, and foil means mounted for rotation coaxially with the axis of said cylinder.
Claim 2
Dependent Claim
85 words
A screen apparatus for processing stock flowing to a papermaking headbox comprising: a cylindrical housing, a tubular screen mounted longitudinally within said housing, inlet means for introducing a stock suspension into said housing for flow through said screen, outlet means receiving the suspension passing through said tubular screen for delivery to said headbox, said housing having a helical slot formed therein which discharges stock passing through said screen into said outlet means, and foil means mounted for rotation coaxially with the axis of said cylinder.
Claim 3
Dependent Claim
23 words
A screen apparatus according to claim 1 in which: said slot extends for at least 75% of the length of the foil means.
Claim 4
Dependent Claim
30 words
A screen apparatus according to claim 2 in which: said foil means includes a rotatable shaft and foils supported radially from said shaft, said foils being spaced approximately 45° apart.
Claim 5
Dependent Claim
20 words
A screen apparatus according to claim 1 in which: said foil means extends the full width of said tubular screen.
Claim 6
Dependent Claim
18 words
A screen apparatus according to claim 1 in which: said outlet means is positioned centrally of said screen.
Claim 7
Dependent Claim
27 words
A screen apparatus according to claim 1 in which: said outlet means has a circular discharge opening of substantially greater diameter than the width of said slot.
Claim 8
Dependent Claim
29 words
A screen apparatus according to claim 1 in which: the inner wall of said housing and the outer wall of said tubular screen are separated by an annular chamber.
Claim 9
Dependent Claim
40 words
A screen apparatus according to claim 1 in which: said outlet means is secured to said housing along spaced tangential lines, the angle included between said tangential lines being substantially greater than the angle included between two adjacent foil means.
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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) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |