US4363701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supporting member for paper-making screen in paper machines
Assignee: Kyoto Ceramic Co Ltd
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Filing: 1981-04-16
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Granted: 1982-12-14
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Expires: 2001-04-16
Abstract
Abstract A supporting member of the papermaking screen in paper machines is disclosed, which is made with a sintered body consisting essentially of silicon nitride, having a porosity of less than about 0.8% whereby the abrasion loss rate of the papermaking screen is able to be remarkably reduced as compared with the conventional supporting members made of alumina ceramic, as a result of which the useful life of the papermaking screen can be lengthened greatly.
Inventors
- 👤 Yasunobu Kawae
- 👤 Michio Kakimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:01
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/48; D21F1/52; D21F1/523; D21F1/483
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
45 words
In a paper making machine having a continuous moving screen, the improvement comprising one or more supporting members for partially supporting said screen, each said supporting member comprising a sintered body consisting essentially of silicon nitride having a porosity of approximately 0.8 percent or less.
Claim 2
Dependent Claim
45 words
In a paper making machine having a continuous moving screen, the improvement comprising one or more supporting members for partially supporting said screen, each said supporting member comprising a sintered body consisting essentially of silicon nitride having a porosity of approximately 0.8 percent or less.
Claim 3
Dependent Claim
33 words
A machine according to claim 1 wherein at least one of said supporting members is affixed to a forming board so as to form an interface between said forming board and said screen.
Claim 4
Dependent Claim
31 words
A machine according to claim 1 wherein at least one of said supporting members is affixed to a deflector so as to form an interface between said deflector and said screen.
Claim 5
Dependent Claim
31 words
A machine according to claim 1 wherein at least one of said supporting members is affixed to a foil so as to form an interface between said foil and said screen.
Claim 6
Dependent Claim
35 words
A machine according to claim 1 wherein said paper making machine is a twin wire type and further wherein said supporting members are disposed alternatively on each side of a pair of parallel papermaking screens.
Claim 7
Dependent Claim
22 words
A machine according to claim 2 wherein said supporting member affixed to said forming board supports said papermaking section directly and contiguously.
Claim 8
Dependent Claim
36 words
A papermaking machine comprising a papermaking screen and a supporting member for said papermaking screen, said supporting member made of a sintered body consisting essentially of silicon nitride having a porosity of approximately 0.8% or less.
Claim 9
Dependent Claim
36 words
A papermaking machine comprising a papermaking screen and a supporting member for said papermaking screen, said supporting member made of a sintered body consisting essentially of silicon nitride having a porosity of approximately 0.8% or less.
Claim 10
Dependent Claim
53 words
A papermaking machine as in claim 7 wherein said papermaking machine is of a long-screen type, and said supporting member is affixed to a forming board, a deflector, or a foil, or any combination thereof such that said member serves as an interface between said forming board, deflector or foil and said screen.
Claim 11
Dependent Claim
25 words
A papermaking machine as set forth in claim 8 wherein said supporting member affixed to said forming board supports said papermaking screen directly and contiguously.
Claim 12
Dependent Claim
36 words
A papermaking machine as set forth in claim 7 wherein said papermaking machine is a twin wire type and said supporting member is so disposed as to be able to compress a pair of papermaking screens.
References Cited (Backward Citations)
USRE29417E
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |