Textiles: weaving – Fabrics – Drier felts
Patent
1998-09-17
2000-05-23
Falik, Andy
Textiles: weaving
Fabrics
Drier felts
162904, 428222, D21F 100
Patent
active
060655054
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
The invention relates to a stitched seam for high-tensile woven fabrics especially for dryer fabric for paper machine clothing in which the warp yarn loops of the two fabric sections to be interconnected are connected together at the location of the common seam by means of a closure wire.
In so-called loop stitch seams the fabric edge is basically that portion which is subjected to the greatest stress. If excessive tensions are created in the fabric, there frequently occurs in those portions a so-called eyelet rupture, which requires repair or replacement of the fabric.
The object of the invention is to strengthen this weak spot and thereby prevent the risk of an eyelet rupture, or at least reduce it, and thereby increase the life span of such fabrics.
This object is achieved in accordance with the invention by providing at least one of the two outer regions of the two fabric sections which are to be interconnected at the seam location with at least one worked-in helix, while the remaining portion of the stitched seam at the ends of the two fabric sections consists of the loops formed by the warp yarns of the fabric.
Further embodiments of the invention are the subject of the dependent claims.
SUMMARY
The stitched seam constituting the invention consists essentially of an extraneous material which takes the shape of a helix and is worked into at least one, but generally into both edge portions of the two fabric sections. In this way there is created a stitched seam which consists of two different seam systems and which results in strengthening precisely the weak spots, namely the outer regions of the fabric. In contrast to a conventional loop seam, in which only every second yarn can be used as a connecting yarn, so that the seam strength is approximately 50% of the fabric tear strength, by using a seam reinforcement in accordance with the invention, the helices are held in by all the warp yarns so that a substantial increase in seam tear strength is achieved compared to a loop seam. In so doing, the tear strength is primarily a function of the strength of the helices, i.e., their diameter and their material properties.
The helix configuration is such that a helix is worked into each of the left and right edge portions of the confronting free ends of the two fabric sections. At the locations of the helices the warp yarns protrude, in loop shape, equally far into the end region, whereas, in the remaining portion of the fabric web, they are displaced with respect to each other in the lengthwise direction in conventional manner and the loops of the two fabric sections alternately protrude differently far, so that only every second loop of each of the two fabric sections encircles the connecting wire.
The ends of the two helices in the two fabric sections are attached toward the fabric center. At the edge, the respective helix end portion is straightened and pulled back toward the fabric and at the transition from the loop seam a straightened piece is worked in so that the helix ends cannot be pulled out. The working-in of the helices can take place at the same time as the production of the loop seam but it is also readily possible to work the helices in separately at a later time.
BRIEF DESCRIPTION OF THE DRAWINGS
In what follows the invention is explained with reference to the drawing by means of illustrative examples. There is shown in
FIG. 1 an illustration in principle of the stitched seam according to the invention, in open position,
FIG. 1a an illustration in principle corresponding to FIG. 1 in closed position,
FIG. 2 a detailed illustration of a segment of the seam construction in accordance with the invention in the closed position, seen from above,
FIG. 3 an illustration of the stitched seam in the form of a circular fragment of FIG. 2, but only the stitched seam portion of fabric section 1 ,
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 shows the ends of two fabric sections 1 and 2, which are connected to each other by a common stitched seam 3. The stitched seam 3 con
REFERENCES:
patent: 1747272 (1930-02-01), Webb
patent: 4141388 (1979-02-01), Romanski et al.
patent: 4574435 (1986-03-01), Luciano et al.
patent: 4649619 (1987-03-01), Romanski
patent: 4827579 (1989-05-01), Gisbourne
patent: 5488976 (1996-02-01), Lorenz et al.
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