Pintle seamed press felt

Details Pintle seamed press felt Pintle seamed press felt

1999-03-11

2001-04-10

Falik, Andy (Department: 3741)

Textiles: weaving

Fabrics

Drier felts

C442S270000, C162S904000

Reexamination Certificate

active

06213164

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention is directed to a multi-layered press fabric having a pintle connected seam forming it endless.
Seams in multi-layered fabrics which are connected with a pintle are well known throughout the papermaking fabric industry. The problems caused by these seams are also well known. For example, where multiple pintles are used, the problem of uneven compression at the seam due to the presence of the non-compressible pintles is a concern. Pintle seams also produce support surface areas at the seam which have uneven density causing the paper product to be marked. Also, the caliper of fabrics so seamed is sometimes uneven. Various attempts to provide a pintle seam which overcomes some or all of the deficiencies are disclosed in U.S. Pat. No. 4,698,250 to Talonen et al, U.S. Pat. No. 4,824,525 to Penven, and U.S. Pat. No. 4,842,925 to Dufour et al.
The instant invention has for its object a seam construction for a papermaking fabric which provides for more uniform cover over its entire support surface.
Another object of the invention is a seamed papermaking fabric in which the end most transverse yarns are maintained stable during use.
Another object of the invention is a papermaking fabric in which the cover at the seam is substantially uniform of the cover of the remainder of the support surface.
Another object of the invention is the provision of a papermaking fabric in which the caliper remains uniform throughout.
SUMMARY OF THE INVENTION
The invention is directed to a seamed multi-layer press felt for use in a papermaking machine, the seam acting to form the felt endless. The felt includes at least first and second interconnected fabric layers and a needled fibrous layer on at least its outer surface. Each fabric layer comprises MD yarns (machine direction yarns) interlaced with CMD yarns (cross machine direction yarns) to form each layer with a body portion having a row of loops at opposed MD ends thereof. The loops of the first or innermost of the fabric layers are intermeshed and receive a pintle forming the seam which interconnects the opposed MD ends of the first fabric layer. Each of the loops of the remaining fabric layers each have a stuffer yarn or filler positioned therein. The stuffer yarn along with the CMD and MD yarns of the upper fabric layer form a portion of the needled fibrous layer. The press felt is constructed so that each of the at least first and second fabric layers are of different MD length with the first or innermost of the fabric layers being longer than the remaining of the fabric layers. When there are at least three fabric layers, the intermediate layer of the fabric layers may have a MD length greater than the second fabric layer but less than the first fabric layer. In all arrangements each loop of the rows of loops at the opposed MD ends has a stuffer yarn positioned therein with the exception of the loops formed with the first layer. The stuffer yarn may be a multi-filament yarn or a knitted yarn formed of a single multi-filament yarn or of a plurality of multi-filament yarns. The loops of all fabric layers, save the first fabric layer, are juxtaposed, are partially intermeshed, or are intermeshed.
The invention is also directed to a multi-layer papermaking fabric, including at least a felt outer surface which is formed endless by a seam, wherein the fabric includes a plurality of superimposed and interconnected fabric layers including at least an inner and outer layer. Each layer has a plurality of transversely spaced seam forming loops (each having an axes) at its opposed longitudinal ends. The loops of the inner layer are intermeshed with their axes aligned forming a channel across the fabric. A pintle is positioned along these aligned axes interconnecting the opposed rows of loops and forming a seam which forms the fabric endless. The loops of at least the outer layer may be in juxtaposed position with their axes misaligned across the fabric width. The loops of at least the outer layer contain a stuffer or filler yarn. This stuffer yarn along with the fabric forming yarns of at least the outer layer contribute to the formation of the felt. The fabric layers along with the felt are interconnected by needling.
The loops of the inner fabric layer are always intermeshed and formed into a seam. The loops of the remaining fabric layers may be fully intermeshed with their axes aligned, partially intermeshed with their axes misaligned or juxtaposed in end to end engagement. A stuffer yarn is positioned adjacent each of said opposed ends within respective of the loops. The stuffer yarn may be a knit yarn or a multi-filament yarn.
All of the fabric layers may be woven or they may be formed of interconnected coils or they may be selectively formed by any one of these.


REFERENCES:
patent: 4141388 (1979-02-01), Romanski et al.
patent: 4418726 (1983-12-01), Josef et al.
patent: 4698250 (1987-10-01), Talonen et al.
patent: 4824525 (1989-04-01), Penven
patent: 4842925 (1989-06-01), Dufour et al.
patent: 4856562 (1989-08-01), Dufour
patent: 4863786 (1989-09-01), Green et al.
patent: 4883097 (1989-11-01), Dufour
patent: 5082532 (1992-01-01), Dufour
patent: 5799709 (1998-09-01), Shipley
patent: 5904187 (1999-05-01), Davenport
patent: PCT/US98/06362 (1998-04-01), None

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