Claims
- 1. A wet press felt comprising:a woven base fabric having a paper carrying side; said base fabric including a first system of yarns interwoven with a second system of yarns; said first system yarns being hollow, synthetic monofilament yarns having an O-shaped cross-section and an internal core void of at least 16%, being compressible from a substantially round cross-section to a fully flattened cross-section when subjected to nip pressures of at least 200 psi, and being sufficiently resilient to rebound to an uncompressed state after passing through a press nip; and said base fabric being woven and finished such that in said finished base fabric: portions of said first system yarns which contact said second system yarns have at least a partially flattened cross-section, and said first system yarns remain substantially unflattened in cross-section thereby defining resiliently compressible cushioning for enhancing wet press felt performance in dewatering an aqueous paper web through a press nip.
- 2. A wet press felt according to claim 1 wherein said second system yarns are oriented in the machine direction (MD) of the base fabric and said first system yarns are oriented in the cross machine direction (CMD) of said base fabric.
- 3. A wet press felt according to claim 2 wherein said MD yarns are twisted monofilament nylon yarns, said CMD yarns are nylon yarns having an internal core void of approximately 18%, and said base fabric is woven such that said CMD yarns define three yarn floats on at least said paper carrying side of said base fabric.
- 4. A wet press felt according to claim 3 further characterized in that a fibrous batt is needled onto at least said paper carrying side of said base fabric.
- 5. A wet press felt according to claim 4 wherein said MD yarns are woven in two layers with a total of 46 MD yarns per inch and said CMD yarns are interwoven with both layers of MD yarns in an eight shed, 16 MD yarn repeat pattern 30 CMD yarns per inch.
- 6. A wet press felt according to claim 1 wherein said first system yarns are woven to define CMD yarn floats on said base fabric paper carrying side and are hollow monofilament yarns having an internal core void of approximately 18%.
- 7. A wet press felt according to claim 6 wherein said MD yarns are woven in two layers with a total of 46 MD yarns per inch and said CMD yarns are interwoven with both layers of MD yarns in an eight shed, 16 MD yarn repeat pattern 30 CMD yarns per inch.
- 8. A wet press felt according to claim 1 further characterized in that a fibrous batt is needled onto at least said paper carrying side of said base fabric.
- 9. A wet press felt according to claim 2 further characterized in that a fibrous batt is needled onto at least said paper carrying side of said base fabric.
Parent Case Info
This is a continuation of application Ser. No. 07/955,513, filed on Oct. 2, 1992, now U.S. Pat. No. 5,368,696.
US Referenced Citations (14)
Foreign Referenced Citations (1)
Number |
Date |
Country |
790861 |
Sep 1980 |
FI |
Non-Patent Literature Citations (1)
Entry |
Specification Sheet of Antron Yarns Available from DuPont. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
07/955513 |
Oct 1992 |
US |
Child |
08/342827 |
|
US |