US5043046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extended nip-press
Assignee: Valmet Technologies Oy
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Filing: 1990-03-01
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Granted: 1991-08-27
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Expires: 2010-03-01
Abstract
Abstract An extended-nip press for dewatering of a paper or board web, comprising a counter-member (10), which forms an extended press zone (S) together with a press-glide shoe (33) and a glide belt (40) running around the shoe. Through said zone (S), at least one dewatering fabric (50) and the web (W) from which water is removed and which is supported by said fabric are passed. The glide belt (40) is passed over a leading and tensioning member (43; 70), and the closed loop of the glide belt (40) is guided around its leading and tensioning member (43; 70) so that, between said leading and tensioning member (43; 70) and the glide shoe (33) and its possible guide parts (33a, 33b), if any, the glide belt (40) has, as a rule, substantially straight runs (40a, 40b). The space enclosed by the glide belt (40) and susceptible to oil splashes is closed at both of the end areas of the loop of the glide belt (40 ) by means of wall constructions (42a, 42b), which may, if necessary, be provided with expansion joints (61) fitted in such a way that movements of the glide shoe (33) and of the leading and tensioning member (43; 70) for the glide belt (40) in relation to one another are possible.
Inventors
- 👤 Jorma Laapotti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:33
CPC Classifications
D; D21; D21F; D21F3/00; D21F3/02; D21F3/0209; D21F3/0218; D21F3/0227; D21F3/0245
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
181 words
An extended-nip press for dewatering of a paper or paperboard web, which comprises; a counter-member; a press-glide shoe; a glide belt running around part of the periphery of said press-glide shoe such that an extended press zone is formed between said counter-member and said glide belt, said press zone being capable of having at least one dewatering fabric and said web passed therethrough to remove water from said web; a leading and tensioning member having a diameter, said glide belt running around part of the periphery of said leading and tensioning member such that between said part of the periphery of said leading and tensioning member and said part of the periphery of said press-glide shoe said glide belt has two straight runs substantially parallel to each other, the width of said press-glide shoe being substantially equal to the diameter of said leading and tensioning member, and a pair of walls having a space between them and respectively located within a closed loop formed by said glide belt and respectively functioning to protect the space between them from lubricating oil splashes.
Claim 2
Dependent Claim
181 words
An extended-nip press for dewatering of a paper or paperboard web, which comprises; a counter-member; a press-glide shoe; a glide belt running around part of the periphery of said press-glide shoe such that an extended press zone is formed between said counter-member and said glide belt, said press zone being capable of having at least one dewatering fabric and said web passed therethrough to remove water from said web; a leading and tensioning member having a diameter, said glide belt running around part of the periphery of said leading and tensioning member such that between said part of the periphery of said leading and tensioning member and said part of the periphery of said press-glide shoe said glide belt has two straight runs substantially parallel to each other, the width of said press-glide shoe being substantially equal to the diameter of said leading and tensioning member, and a pair of walls having a space between them and respectively located within a closed loop formed by said glide belt and respectively functioning to protect the space between them from lubricating oil splashes.
Claim 3
Dependent Claim
51 words
The extended-nip press of claim 1, wherein each of said pair of walls comprise an expansion joint, each said expansion joint being situated within a respective one of said pair of walls such that movements of said press-glide shoe and said leading and tensioning member relative to each other are facilitated.
Claim 4
Dependent Claim
36 words
The extended-nip press of claim 1, further comprising a plurality of sealing members, each of said sealing members being attached to a respective one of said pair of walls either directly or through an intermediate member.
Claim 5
Dependent Claim
39 words
The extended-nip press of claim 3, further comprising two tabular and/or bellows-like loading members, said loading members being loaded by a pressure medium, said loading members each comprising a sealing rib whose glide face rubs against said glide belt.
Claim 6
Dependent Claim
14 words
The extended-nip press of claim 4, wherein said sealing ribs have lubricant grooves therein.
Claim 7
Dependent Claim
81 words
The extended-nip press of claim 1, further comprising a frame beam around which said glide belt runs, and further comprising a first plurality of hydraulic loading members for said press-glide shoe, several of said plurality of loading members being arranged to control a transverse profile of distribution of compression pressure and further comprising, on an opposite side of said frame beam, a second plurality of loading members for regulating the position of said glide belt so as to regulate its tension.
Claim 8
Dependent Claim
88 words
The extended-nip press of claim 1, wherein said press-glide shoe has a concave press-glide face, and wherein said glide belt has convex guide faces respectively abutting said concave press-glide face of said press-glide shoe such that said convex guide faces of said glide belt constitute direct extensions of said press-glide face, and wherein said convex guide faces are hydrodynamically and/or hydrostatically lubricated, and that the combined width of said concave press-glide face and said convex guide faces is equal to the diameter of said leading and tensioning member.
Claim 9
Dependent Claim
16 words
The extended-nip press of claim 7, wherein said leading and tensioning member is a tensioning roll.
Claim 10
Dependent Claim
14 words
The extended-nip press of claim 8, wherein said tensioning roll has a grooved face.
Claim 11
Dependent Claim
28 words
The extended-nip press of claim 1, wherein said leading and tensioning member is a hydrodynamically and/or hydrostatically lubricated glide shoe having a face of substantially crescent-shaped cross section.
Claim 12
Dependent Claim
33 words
The extended-nip press of claim 1, further comprising an outside alignment roll functioning to transversely align said glide-belt, said outside alignment roll being situated in the proximity of said leading and tensioning member.
Claim 13
Dependent Claim
29 words
The extended-nip press of claim 1, further comprising an outside alignment roll functioning to transversely align said glide belt, said outside alignment roll being provided with a resilient coating.
Claim 14
Dependent Claim
16 words
The extended-nip press of claim 1, further comprising a dewatering fabric which contacts said glide belt.
Claim 15
Dependent Claim
21 words
The extended-nip of claim 13, wherein said dewatering fabric comprises a press felt and said counter-member is a smooth-faced press roll.
Claim 16
Dependent Claim
34 words
The extended-nip press of claim 1, further comprising two press fabrics which contact said glide belt and a web which passes between said two press fabrics, and wherein said counter-member is a hollow-faced roll.
Claim 17
Dependent Claim
48 words
The extended-nip press of claim 1, wherein said counter member is a smooth faced roll, further comprising a press felt and a web which pass through said press zone and an induction and/or IR heater mounted within said press such that said web and said felt are heated.
Claim 18
Dependent Claim
27 words
The extended-nip press of claim 16, wherein said heating is performed by apparatus from the group consisting of a steam box, an IR-heater, and a high-frequency heater.
References Cited (Backward Citations)
US3748225A
Cited
US3808096A
Cited
US3783097A
Cited
US3840429A
Cited
US4518460A
Cited
US4506456A
Cited
US4563245A
Cited
US4673461A
Cited
US4874469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |