Patent US4842929A successfully refreshed from Google Patents.
US4842929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Papermaker's wet press felt with predensified batt thereon
Assignee: Asten Inc
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Filing: 1988-03-01
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Granted: 1989-06-27
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Expires: 2008-03-01
Abstract
Abstract Process of manufacturing felts in which a batt is fastened to a felt on its one or two sides, said batt (5) consisting of one or several layers of fibers and characterized in that said layers are obtained from carding the fibers and possibly preneedling them by passage through a preneedling machine with low density needles, said layers being densified by at least three passages through a needling machine (1) with high needle density, and at least one of those passages going in the opposite direction of the others, said batt (5) created in such a way then being fastened to the felt (10). The wet felt obtained in this way has very good cohesion and very high resistance, and the felt is neither damaged nor filled with fibers, which provides it with good air and water permeability. The invention also relates to a machine to densify batts.
Inventors
- 👤 Marcel Dufour
- 👤 Jacques Piat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:39
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/44; D04H1/46; D04H18/00; D04H18/02; D04H1/498; D04H13/00; D21; D21F; D21F7/00; D21F7/08; D21F7/083; Y; Y10; Y10T; Y10T442/00; Y10T442/30; Y10T442/3707; Y10T442/3724; Y10T442/3732; Y10T442/378; Y10T442/3789
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 words
An improved wet press felt of the type having a base which is combined with at least one batt consisting of multiple fiber layers, the improvement characterized in that prior to being combined with said base said batt is predensified by at least three passages through a needling machine having a high needle density board on the order of 3,000 needles per meter of length for a 40 centimeters width and with at least one of those passages in the opposite direction of the others.
Claim 2
Dependent Claim
85 words
An improved wet press felt of the type having a base which is combined with at least one batt consisting of multiple fiber layers, the improvement characterized in that prior to being combined with said base said batt is predensified by at least three passages through a needling machine having a high needle density board on the order of 3,000 needles per meter of length for a 40 centimeters width and with at least one of those passages in the opposite direction of the others.
Claim 3
Dependent Claim
21 words
The wet press felt of claim 1 further characterized in that the belt is fastened onto the base felt by needling.
Claim 4
Dependent Claim
46 words
The wet press felt of claim 1 further characterized in that the batt is fastened onto the base felt by low density needling through a needling machine with a needle density on the order of 1,000 needles per meter of length for a 40 centimeter width.
Claim 5
Dependent Claim
99 words
An improved wet press felt of the type comprising a base felt in combination with at least one densified batt comprised of multiple fiber layers, the improvement characterized in that said batt was predensified, before combination with the base felt, by at least three passages through a needling machine having a high needle density board on the order of 3,000 needles per meter of length for a 40 centimeters width with at least one of those passages in the opposite direction of the others so that no substantial additional batt densification resulted from the combination with the base felt.
Claim 6
Dependent Claim
99 words
An improved wet press felt of the type comprising a base felt in combination with at least one densified batt comprised of multiple fiber layers, the improvement characterized in that said batt was predensified, before combination with the base felt, by at least three passages through a needling machine having a high needle density board on the order of 3,000 needles per meter of length for a 40 centimeters width with at least one of those passages in the opposite direction of the others so that no substantial additional batt densification resulted from the combination with the base felt.
Claim 7
Dependent Claim
46 words
The wet press felt of claim 4 further characterized in that the batt was fastened onto the base felt by low density needling through a needling machine with a needle density on the order of 1,000 needles per meter of length for a 40 centimeter width.
Claim 8
Dependent Claim
22 words
The wet press felt of claim 4 further characterized in that the batt was fastened onto the base felt by adhesive means.
References Cited (Backward Citations)
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US3199166A
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US3230599A
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US3368256A
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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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |