Patent US4396161A successfully refreshed from Google Patents.
US4396161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disk refiner
Assignee: Stora Enso Oyj
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Filing: 1981-03-25
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Granted: 1983-08-02
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Expires: 2001-03-25
Abstract
Abstract Disk refiner for cellulose, paper or other equivalent pulp, with two mutually opposed blade disks, at least one of which is rotatable, carrying grinding surfaces facing each other and having within the circumference defined by the grinding surface of one blade disk, in the pulp inlet duct, a sieve plate concentric with the blade disks. Within the sieve plate there is a concentric guide plate so that between the sieve plate and the guide plate there is defined a gap through which the pulp to be refined goes to the grinding surfaces.
Inventors
- 👤 Pekka Ruokolainen
- 👤 Juhani Kyytsonen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:44
CPC Classifications
D; D21; D21D; D21D1/00; D21D1/20; D21D1/30; D21B; D21B1/00; D21B1/04; D21B1/12; D21B1/14; D21B1/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
In a disk refiner for cellulose, paper or other equivalent pulp including two mutually opposed blade disks, one of which is rotatable and acts as a rotor and the other of which acts as a stator, a pulp inlet duct, opposed grinding surfaces facing each other formed on said blade disks, and a sieve plate concentric with said blade disks located within the circumference defined by the grinding surface of one of said blade disks in the pulp inlet duct, the improvement comprising that within said sieve plate there is a concentric guide plate so that between the sieve plate and the guide plate there is defined a gap along which the pulp to be refined passes to the grinding surfaces, and wherein the sieve plate is affixed to the grinding disk acting as a rotor and the guide plate is affixed to the grinding plate acting as a stator.
Claim 2
Dependent Claim
150 words
In a disk refiner for cellulose, paper or other equivalent pulp including two mutually opposed blade disks, one of which is rotatable and acts as a rotor and the other of which acts as a stator, a pulp inlet duct, opposed grinding surfaces facing each other formed on said blade disks, and a sieve plate concentric with said blade disks located within the circumference defined by the grinding surface of one of said blade disks in the pulp inlet duct, the improvement comprising that within said sieve plate there is a concentric guide plate so that between the sieve plate and the guide plate there is defined a gap along which the pulp to be refined passes to the grinding surfaces, and wherein the sieve plate is affixed to the grinding disk acting as a rotor and the guide plate is affixed to the grinding plate acting as a stator.
Claim 3
Dependent Claim
30 words
The improvement according to claim 1 wherein said sieve plate is affixed to said blade disk acting as a rotor by means of feed vanes on said rotating blade disk.
Claim 4
Dependent Claim
27 words
The improvement according to claim 2 wherein between said feed vanes there are provided apertures by which the pulp discharges into the gap between the grinding surfaces.
Claim 5
Dependent Claim
39 words
The improvement according to claim 3 wherein the feed vanes are inclined, as viewed in the direction of rotation of said blade disk acting as a rotor, from the outer periphery of said rotating blade disk toward its center.
Claim 6
Dependent Claim
29 words
The improvement according to claim 1 further comprising members located in the gap defined between the sieve plate and the guide plates operating to keep said sieve plate clean.
Claim 7
Dependent Claim
43 words
The improvement according to claim 5 wherein said members keeping said sieve plate clean are protuberances on the surface of said guide plate which cause in the sieve plate a pressure pulsation due to which the holes in the sieve plate remain open.
Claim 8
Dependent Claim
16 words
The improvement according to claim 6 wherein said protuberances are in the shape of spherical nodules.
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) | 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 |