Textiles: weaving – Fabrics – Drier felts
Patent
1997-09-25
1999-06-29
Falik, Andy
Textiles: weaving
Fabrics
Drier felts
428 58, 24 33P, D21F 112, D21F 710, F16G 304
Patent
active
059154225
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to the technical field of seamed clothings for paper and cellulose machines. More specifically, the invention relates to an improved spiral for use in seams on clothings comprising flat filament yarns in the machine direction, i.e. in the running direction of the clothing in the machine. According to a first aspect, the invention relates to a machine clothing having such a seam and, according to a second aspect, a spiral for use in such a seam. The invention is especially applicable to the production of seams on dryer fabrics, but it may also be used for forming fabrics, press felts, filter cloths, belts etc, and is not exclusively usable for woven clothings.
BACKGROUND ART
It is known to use loop seams and spiral seams in openable clothings, such as dryer fabrics, for paper and cellulose machines, the opposite seam edges of the clothing each having a row of loops. When the clothing is to be installed in the machine, this is carried out with the seam being open, whereupon the seam edges are moved together and the seam loops of one row are meshed with the seam loops of the other row. Then the seam is joined by a so-called pintle wire being passed through the thus intermeshed rows of loops. The principle of such seamed clothings is described in more detail in an article by T. Branham in Tappi Journal (USA), June 1994, Vol. 77, No. 6, pp 285-288.
In a so-called warp loop seam, the rows of loops are formed of extended edge loops of warp yarns in the fabric structure of the clothing. In a so-called spiral seam, each row of loops is instead formed of a separate, preformed yarn spiral, which is extended along and attached by means of machine direction yarns, such as warp yarns, to the seam edge of the clothing. The yarn spiral is normally attached to the seam edge by being, after completion of the weaving, spliced into the seam edge by means of a special splicing machine. Alternatively, the spiral can be attached to the clothing by a number of cross-machine direction yarns being ravelled a distance from the seam edge, whereupon the loops of the spiral are inserted into the thus formed looser edge portion. Then the edge is folded back over itself and is attached to -he clothing, for instance, by using a sewing-machine. Independently of how the spiral is attached, the clothing comprises two spirals, one along each seam edge, which, when joining together the fabric, are meshed with each other like a zipper so as to be joined together by means of a pintle wire or the like.
Using such separate spirals is, in some cases, preferred to woven warp loops, since the shape of seam loops formed of a spiral is less dependent on the weaving technique.
A seam is generally a critical part of a seamed machine clothing, since a uniform paper quality, low marking and an excellent runnability of the clothing require a seam which is as similar as possible to the rest of the clothing in respect of properties such as thickness, structure, strength, permeability etc. These requirements are especially important in dryer fabrics in drying positions with suction rolls.
However, there are problems in prior-art spiral seams if the yarn spirals are bound to the seam edges by means of so-called flat filament yarns. In many cases, a dryer fabric is today woven of flat filament yarns, at least in its machine direction. By flat filament yarns are below meant yarns of non-circular cross-section. The cross-section of a flat filament yarn can be essentially rectangular, elliptic, an elongated polygon or combinations thereof. In general, the cross-section of the flat filament yarn has a great cross-sectional dimension and a small cross-sectional dimension. In the ready dryer fabric, the flat filament yarn extends with its great cross-sectional dimension substantially in parallel with the principal plane of the fabric.
Flat filament yarns are preferred to round yarns of circular cross-section, on the one hand because a flat filament yarn does not build up in the thickness direction to t
REFERENCES:
patent: 2228926 (1941-01-01), Mattaei et al.
patent: 4827579 (1989-05-01), Gisbourne
patent: 4896702 (1990-01-01), Crook
patent: 5488976 (1996-02-01), Lorenz et al.
International Search Report. PCT/SE96/00380 Apr. 7, 1996.
Albany Nordiskafilt AB
Falik Andy
LandOfFree
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