Sewing – Products – Sewn web or sheet
Reexamination Certificate
1999-11-26
2001-07-31
Izaguirre, Ismael (Department: 3765)
Sewing
Products
Sewn web or sheet
C162S904000
Reexamination Certificate
active
06267068
ABSTRACT:
The object of the invention is to provide, for fabrics of the subject type, a reinforcement of the stitched seam having very high seam tear strength.
This is accomplished by adding to the warp yarn loops at the stitched seam location and the closure wire at least one reinforcing yarn which has loops in the vicinity of the eyelets extending parallel to the warp yarn loops for receiving the closure wire.
Further embodiments of the invention are the subject of the dependent claims.
Through the configuration of a stitched fabric seam in accordance with the invention the seam tear strength is decisively increased, due to the additional connecting yarn or wire which is enmeshed in the eyelet region either loosely or as a helical yarn. This yarn or wire can consist of various materials, preferably of monofilaments with round or flat cross-section, e.g. polyester, PEEK, Ryton, polyamide, PCTA, metal or the like, or of mono- and multiplastics with various core yarns. All yarns can be braided or spun, impregnated, coated, including the use of carbon filaments or fibers. Further inserts of thin steel wires can be used. Reinforcing yarns of the inventive kind preferaly have a thickness which is equal to or smaller than the thickness of the seam loops. They are, for example, anchored in each case behind one or more cross machine direction (CMD) yarns.
In a specific embodiment of the invention the seam reinforcement is so configured around the closure wire that one warp yarn loop of the warp yarn from one of the fabric portions and one loop of the helical reinforcing yarn at one side of the seam connection alternates with one turn of the helical reinforcing strip and a warp loop of the warp yarn from the confronting fabric portion.
In another specific embodiment of the invention, the reinforced seam connection is so constructed that, along the length-wise axis of the closure wire, one warp loop of the warp yarn from one of the fabric portions alternates with one turn of the reinforcing helix of this fabric portion with a warp loop of a warp yarn from the other fabric portion and a turn of the reinforcing strip from of the other fabric portion, and so forth.
Basically, by means of the invention, there is bound in the eyelet region of the warp yarns adjoining both sides of the stitched seam an additional yarn either loosely or as a separate helix. This provides a high tensile stitched seam which substantially enhances the seam tear strength. That is especially desirable for fabrics with low warp yarn count, because a hinge effect which that causes has a negative influence on the tear strength. Because of the increased seam tear strength, there exist other possibilities for applying various combinations of materials in eyelet region to better meet the higher requirements in paper making machinery technology. Because such reinforcing yarns reduce the spacing between the eyelets of any two adjoining warp yarns, the hinge effect which adversely affects or damages the seam eyelets is eliminated.
REFERENCES:
patent: 3998173 (1976-12-01), Williamson et al.
patent: 4141388 (1979-02-01), Romanski et al.
patent: 5746257 (1998-05-01), Fry
patent: 5875822 (1999-03-01), Fargeout
patent: 6065505 (2000-05-01), Fickers
patent: 324110 (1975-08-01), None
patent: 2449792 (1976-02-01), None
patent: 2806742 (1978-09-01), None
patent: 813486 (1937-06-01), None
Fickers Gisela
Kuckart Stephanie
AstenJohnson, Inc.
Izaguirre Ismael
Volpe and Koenig P.C.
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