US4425190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extended nip shoe for a nip in a papermaking machine
Assignee: Beloit Technologies Inc
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Filing: 1982-04-05
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Granted: 1984-01-10
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Expires: 2002-04-05
Abstract
Abstract An extended nip shoe for a press section in a papermaking machine distributes a compressive force to an inrunning compliant transport system advancing a web of paper. The shoe introduces and maintains a film of lubricant throughout the extended nip shoe-compliant transport system interface. Similarly, release of the compressive force is gradual to eliminate points of high unit loads on the compliant transport system and paper web.
Inventors
- 👤 Dennis C. Cronin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:27
CPC Classifications
D; D21; D21F; D21F3/00; D21F3/02; D21F3/0209; D21F3/0218
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
205 words
A system in a papermaking machine applying a compressive force to a web of paper comprising: a rotating press roll; compliant means for transporting the web of paper around a portion of the press roll; means for applying a film of lubricant to the compliant means for transporting; and means for compressing the compliant means for transporting against the press roll, the means for compressing having a shoe to maintain the film of lubricant along the interface of the means for compressing and the compliant means for transporting, the shoe including: an inrunning surface extended approximately 1°-5° from a line substantially tangent to a load arc, formed by the shoe against the press roll, through the point where the load arc intersects an inrunning nip point created by the shoe and press roll; an outrunning surface extended approximately 1°-5° from a line substantially tangent to the load arc, formed by the shoe against the press roll, through the point where the load arc intersects an outrunning nip point created by the shoe and press roll; means for controllably distributing the release of the compressive force on side edge portions of the compliant transport system; and means for advancing the shoe toward the rotating press roll.
Claim 2
Independent Claim
205 words
A system in a papermaking machine applying a compressive force to a web of paper comprising: a rotating press roll; compliant means for transporting the web of paper around a portion of the press roll; means for applying a film of lubricant to the compliant means for transporting; and means for compressing the compliant means for transporting against the press roll, the means for compressing having a shoe to maintain the film of lubricant along the interface of the means for compressing and the compliant means for transporting, the shoe including: an inrunning surface extended approximately 1°-5° from a line substantially tangent to a load arc, formed by the shoe against the press roll, through the point where the load arc intersects an inrunning nip point created by the shoe and press roll; an outrunning surface extended approximately 1°-5° from a line substantially tangent to the load arc, formed by the shoe against the press roll, through the point where the load arc intersects an outrunning nip point created by the shoe and press roll; means for controllably distributing the release of the compressive force on side edge portions of the compliant transport system; and means for advancing the shoe toward the rotating press roll.
Claim 3
Dependent Claim
58 words
The invention of claim 1, wherein the compliant means for transporting the web of paper around a portion of the press roll comprises: a plurality of fabric loops between which the web of paper is transported and into which moisture from the web is transferred; and means for transferring the compressive force to the plurality of fabric loops.
Claim 4
Dependent Claim
47 words
The invention of claim 1, wherein the compliant means for transporting the web of paper around a portion of the press roll comprises: a fabric loop into which moisture from the web of paper is transferred; and means for transferring the compressive force to the fabric loop.
Claim 5
Dependent Claim
38 words
The invention of claim 2 or 3, wherein the means for transferring the compressive force comprises a belt of impermeable material to maintain a film of lubricant between the means for compressing and the belt of impermeable material.
Claim 6
Dependent Claim
85 words
The invention of claim 1, wherein the means for applying a film of lubricant to the compliant means for transporting comprises: an open reservoir of lubricant; means for raising the lubricant to a level sufficient to contact the entire width of the compliant means for transporting; means for retaining lubricant in the reservoir during contact of the compliant means for transporting with the lubricant; means for catching excess lubricant carried by the compliant means for transporting; and means for circulating caught lubricant to the reservoir.
Claim 7
Dependent Claim
51 words
The invention of claim 1, wherein said point associated with the inrunning surface is located where the compliant means for transporting simultaneously contacts the shoe and roll; and said output associated with the outrunning surface is located where the compliant means for transportion ceases to simultaneously contact the shoe and roll.
Claim 8
Dependent Claim
63 words
The invention of claim 1, wherein said point associated with the inrunning surface is located where the compliant means for transporting is compressed to a predetermined maximum against the roll by the shoe; and said output associated with the outrunning surface is located where the compliant means for transporting ceases to be compressed to a predetermined maximum against the roll by the shoe.
Claim 9
Dependent Claim
53 words
The invention of claim 1, wherein said point associated with the inrunning surface is located where a vertex is formed by the shoe and the compliant means for transporting; and said output associated with the outrunning surface is located where a vertex is formed by the shoe and the compliant means for transporting.
Claim 10
Dependent Claim
33 words
The invention of claim 1, 6, 7, or 8, wherein the inrunning surface is extended approximately 2-4 inches at said angle of approximately 1.5° from the line substantially tangent to the load arc.
Claim 11
Dependent Claim
48 words
The invention of claim 1, 6, 7, or 8, wherein the means for controllably distributing the release of the compressive force on side edge portions of the compliant transport system comprises edge surfaces inclined away from a line substantially parallel to the rotational axes of the press roll.
References Cited (Backward Citations)
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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) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |