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US6179965: Papermakers wet press felt with high contact, resilient base fabric

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Filing Information

Inventor(s) Francis J. Cunnane, III · H. Thomas Sanders ·
Assignee(s) AstenJohnson, Inc. ·
Attorney/Agent(s) Volpe & Koenig, PC ·
Primary Examiner Karen M. Hastings ·
Application Number US8342827
Filing date 11/21/1994
Issue date 01/30/2001
Predicted expiration date 10/02/2012
U.S. Classifications 162/358.2  · 442/270  · 162/900  · 428/398  · 139/383.A  ·
International Classifications --
Kind CodeB2
International Classifications 1623581 · 1623582 · 162900 · 428229 · 428234 · 428398 · 139383 A · 442270 ·
Related U.S. Application DataThis is a continuation of application Ser. No. 07/955,513, filed on Oct. 2, 1992, now U.S. Pat. No. 5,368,696.
9 Claims, 2 Drawings


Abstract

Hollow synthetic monofilament yarns are used in the construction of a base fabric for a papermakers wet felt. The synthetic hollow monofilament yarns have selected interior void, compressibility and resiliency characteristics and are interwoven with other yarns to form a woven base fabric with the hollow monofilament yarns predominating, on at least the paper carrying side of the base fabric. The weaving and finishing of the base fabric results in the hollow monofilament yarns retaining a substantially unflattened cross-section. Accordingly, substantially unflattened portions of the hollow monofilament yarns predominate the paper carrying side of the base fabric thereby providing a cushioning surface which is compressibly resilient to assist in the dewatering of the aqueous paper web as it is transported through a press nip during the manufacture of the paper. Hollow nylon monofilament yarns having approximately 18% internal core void have been found to exhibit the desired compressibility and resiliency characteristics. Preferably a fibrous batt is needled to the base fabric to finish the wet press felt.

Independent Claims | See all claims (9)

  1. 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.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US2132252 APPLETON WIRE WORKS INC Weber Oct 1938
US4107367 Huyck Corporation Fekete Aug 1978
US4142557 Albany International Corp. Kositzke Mar 1979
US4251588 E. I. Du Pont de Nemours and Company Goetemann et al. Feb 1981
US4259394 Huyck Corporation Khan Mar 1981
US4290209 Jwi Ltd. Buchanan et al. Sep 1981
US4351874 Ltd. JWI Kirby Sep 1982
US4379735 JWI Ltd. MacBean Apr 1983
US4414263 Atlanta Felt Company, Inc. Miller et al. Nov 1983
US4461803* Ascoe Felts, Inc. Booth et al. Jul 1984
US4537816 Ascoe Felts, Inc. Booth et al. Aug 1985
US4569883 Albany International Corp. Renjilian Feb 1986
US4883097* Asten Group, Inc. Dufour Nov 1989
US5094719* 501 Asten Group, Inc. Fry Mar 1992

Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
FI790861*TAMPEREEN VERKATEHDAS OYSep 1980
* cited by examiner

Other Publications

Specification Sheet of Antron Yarns Available from DuPont.