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US3861996A Expired / Lapsed US ⏱️ 0.0 years remaining

Paper web transfer system carrying the web from forming wire to press section

Assignee: Ahlstrom Corp
•
Filing: 1971-03-16
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Granted: 1975-01-21
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Expires: 1991-03-16
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Abstract

Abstract Apparatus for transferring a paper web from a papermaking machine forming wire to a press section. A suction pick-up roll located adjacaent the forward run of the forming wire is wrapped in part by a first endless pick-up felt which picks the web up from the forming wire and carries it through the first press nip of the press section. Prior to contacting the paper web the first felt passes through a press nip (for liquid removal) formed between the suction pick-up roll and a press roll. A second felt (i.e., lower support felt) contacts the web carried by the first pick-up felt between the forming wire and press section.

Inventors

  • 👤 Gerhard Walter Dorfel

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 13:08
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/36

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 224 words
An improved press section in a web forming machine of the type having at least two traveling endless felts for contacting and carrying the web, which includes a pick-up roll urging a pick-up felt against the web for transferring the web to the felt, said pick-up felt passing around said pick-up roll and through a press nip for the pick-up felt defined between a press roll and said pick-up roll, a second press roll opposedly positioned to said pick-up roll and defining a second press nip between said pick-up roll and said second press roll through which the web, said pick-up felt and a support felt pass, the web being carried through said second press nip between said felts; a paiR of further press rolls located at a distance from said pickup roll, said pair of press rolls defining therebetween a third press nip through which said support felt and said web pass, the distance between said second press nip and said third press nip serving to eliminate slipping of the felt and stretching of the web; said support felt supporting the web between said second and third press nips; one roll of each of said second and third press nips constituting a guiding roll for said support felt, and roll means for separating the web from the felt after said third press nip.
Claim 2
Dependent Claim 224 words
An improved press section in a web forming machine of the type having at least two traveling endless felts for contacting and carrying the web, which includes a pick-up roll urging a pick-up felt against the web for transferring the web to the felt, said pick-up felt passing around said pick-up roll and through a press nip for the pick-up felt defined between a press roll and said pick-up roll, a second press roll opposedly positioned to said pick-up roll and defining a second press nip between said pick-up roll and said second press roll through which the web, said pick-up felt and a support felt pass, the web being carried through said second press nip between said felts; a paiR of further press rolls located at a distance from said pickup roll, said pair of press rolls defining therebetween a third press nip through which said support felt and said web pass, the distance between said second press nip and said third press nip serving to eliminate slipping of the felt and stretching of the web; said support felt supporting the web between said second and third press nips; one roll of each of said second and third press nips constituting a guiding roll for said support felt, and roll means for separating the web from the felt after said third press nip.

References Cited (Backward Citations)

US2043351A Cited
US2204426A Cited
US2694346A Cited
US2709398A Cited
US3207657A Cited
US3526574A Cited
US3629056A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-01-20 1978-07-22 1979-01-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-01-20 1982-07-22 1983-01-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-01-20 1986-07-22 1987-01-21 $7700.00 Window Closed / Lapsed

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