US4187618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Papermakers' felt
Assignee: Orr Felt Co
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Filing: 1978-04-21
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Granted: 1980-02-12
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Expires: 1998-04-21
Abstract
Abstract A papermakers' felt for the press or dewatering section of a papermaking machine is formed with an inner woven fabric and with a plurality of longitudinally extending, transversely spaced heavy yarns or strands which are supported on the bottom surface of the fabric by a relatively light cross-machine yarn or binder pick which interconnects the heavy strands with the warp yarns of the fabric. A batting of non-woven material is needled primarily into the upper surface of the inner fabric to form the top of the felt. The underlying strands define therebetween relatively open, longitudinally extending spaces or channels into which the water from the web of paper can flow. Some fibers of the batting intermingle and interlock with the strands to provide additional stability to the felt.
Inventors
- 👤 Pieter S. Diehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:24
CPC Classifications
D; D21; D21F; D21F7/00; D21F7/08; D21F7/083; Y; Y10; Y10S; Y10S162/00; Y10S162/90; Y10T; Y10T442/00; Y10T442/30; Y10T442/3179; Y10T442/3195; Y10T442/3203; Y10T442/3707; Y10T442/3724; Y10T442/3732
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
A needled papermakers' felt for use in the press or dewatering sections of a papermaking machine or the like having improved drainage characteristics, comprising: a woven inner fabric having warp and filling yarns, a plurality of longitudinally extending, transversely spaced relatively heavy strands positioned on the bottom surface of said fabric, the transverse spacing of said strands being related geometrically to the warp yarns with said spacing being substantially in excess of that of said warp yarns, relatively light cross machine yarns interconnected with said strands, and a batting of non-woven material needled into the upper surface of said fabric with a portion of said batting carried into and interlocking said strands to said fabric to provide additional stability of said strands while leaving relatively open longitudinal spaces between said strands.
Claim 2
Dependent Claim
131 words
A needled papermakers' felt for use in the press or dewatering sections of a papermaking machine or the like having improved drainage characteristics, comprising: a woven inner fabric having warp and filling yarns, a plurality of longitudinally extending, transversely spaced relatively heavy strands positioned on the bottom surface of said fabric, the transverse spacing of said strands being related geometrically to the warp yarns with said spacing being substantially in excess of that of said warp yarns, relatively light cross machine yarns interconnected with said strands, and a batting of non-woven material needled into the upper surface of said fabric with a portion of said batting carried into and interlocking said strands to said fabric to provide additional stability of said strands while leaving relatively open longitudinal spaces between said strands.
Claim 3
Dependent Claim
155 words
A needled papermakers' felt for use in the press or dewatering sections of a papermaking machine or the like having improved drainage characteristics, comprising: a woven inner fabric having warp and filling yarns, a plurality of longitudinally extending, transversely spaced relatively heavy strands positioned on the bottom surface of said fabric, the transverse spacing of said strands being related geometrically to the warp yarns of said fabric, with said spacing being substantially in excess of the corresponding spacing of said warp yarns, relatively light cross machine yarns interconnected with said strands, said cross machine yarns being spaced a longitudinal distance from each other greater than that of said filling yarns, and a batting of non-woven material needled into the upper surface of said fabric with a portion of said batting carried into and interlocking said strands to said fabric to provide additional stability of said strands while leaving relatively open longitudinal spaces between said strands.
Claim 4
Dependent Claim
155 words
A needled papermakers' felt for use in the press or dewatering sections of a papermaking machine or the like having improved drainage characteristics, comprising: a woven inner fabric having warp and filling yarns, a plurality of longitudinally extending, transversely spaced relatively heavy strands positioned on the bottom surface of said fabric, the transverse spacing of said strands being related geometrically to the warp yarns of said fabric, with said spacing being substantially in excess of the corresponding spacing of said warp yarns, relatively light cross machine yarns interconnected with said strands, said cross machine yarns being spaced a longitudinal distance from each other greater than that of said filling yarns, and a batting of non-woven material needled into the upper surface of said fabric with a portion of said batting carried into and interlocking said strands to said fabric to provide additional stability of said strands while leaving relatively open longitudinal spaces between said strands.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-11 | 1983-08-13 | 1984-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-11 | 1987-08-13 | 1988-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-11 | 1991-08-13 | 1992-02-12 | $7700.00 | Window Closed / Lapsed |