Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Scrim – Woven scrim
Reexamination Certificate
2002-08-15
2004-11-16
Ruddock, Ula C. (Department: 1771)
Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
Scrim
Woven scrim
C442S043000, C442S203000, C139S050000, C139S051000
Reexamination Certificate
active
06818571
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a wide-mesh fabric treated with bonding agents, wherein warp thread bundles comprising a plurality of warp threads and weft thread bundles comprising a plurality of weft threads surround the open inner meshes, wherein at the intersections of the warp thread bundles and weft thread bundles which extend at a right angle to each other the warp threads are interwoven with the weft threads.
2. Discussion of Background Information
Mesh fabrics of that kind which are used in particular for reinforcing bitumen-bound road surfaces or for reinforcing cement- or gypsum-bound layers of mortar, plasters or the like or as geomeshes for reinforcing ground surfaces are known from German laid-open applications (DE-OS)Nos 20 00 937; 31 20 661; 31 36 026, 41 23 055 and U.S. Pat. No. 5,965,467. These meshes can also be used as fishing nets or as ground meshes for raising chickens.
The warp threads and the weft threads preferably comprise multifilament synthetic yarns of high tensile strength, in particular aramid, polyester or the like. It is also possible to use glass filament yarns.
Depending on the respective purpose of use involved, the bonding agent which encloses the warp thread bundle, the weft thread bundle and the intersections thereof and thereby fixes the mesh fabric and protects it from chemical and mechanical loadings can be a PVC plastisol, a latex dispersion or dispersions of bitumen, acrylates or suitable soft plastic materials or mixtures thereof.
Wide-mesh fabrics are very loose prior to impregnation or enclosure with a bonding agent so that the warp threads and the weft threads can be easily displaced unless particular steps are taken in that respect. Interweaving of the warp threads with the weft threads is not sufficient to achieve sufficient stability for the wide-mesh fabric. So that the warp threads of a warp thread bundle and also the weft threads of a weft thread bundle are held together, the known mesh fabrics provide that associated with each warp thread bundle is at least one thin doup thread which is passed in a zig-zag configuration over the parallel warp threads of a warp thread bundle and extends at the sides of the warp thread bundle under a respective weft thread bundle. These doup threads which can be in the form of a half-doup thread or a full-doup thread are only intended to perform the function of holding the warp threads of the warp thread bundle and the weft threads of the weft thread bundle together until the mesh fabric is impregnated and/or encased with a bonding agent.
U.S. Pat. No. 5,965,467 discloses mesh fabrics in which the mutually juxtaposed warp threads of a warp thread bundle are divided into two groups, more specifically the odd-numbered threads in one group and the even-numbered threads in another group, so that in each case a thread of the one group lies beside a thread of the other group. For each mesh the threads of such a pair of warp threads cross twice in the manner of a full doup thread. At the intersections of that mesh fabric each weft thread is passed through between all pairs of warp threads of the warp thread bundle so that at the intersections the warp threads are interwoven with the weft threads in a linen weave.
Although this known mesh fabric is highly expensive in terms of the weaving procedure, it does not provide that the warp threads of a warp thread bundle are held together. In addition, the numerous crossing of the weft threads with the warp threads at the intersections of the weft thread bundles with the warp thread bundles suffers from the disadvantage that the warp threads are wider because the weft threads of the two groups of the weft thread bundle are passed in opposite directions between the mutually juxtaposed warp threads. A further effect of this frequent crossing of the warp and weft threads is that the mesh fabric is more stretchable than without that mutual crossing.
SUMMARY OF THE INVENTION
The present invention provides a mesh fabric in which the fixing which is achieved by a weave procedure is stronger than in the known mesh fabrics and in which stronger intermeshing with the ground surface to be reinforced or the layer to be reinforced is achieved by the warp threads of the warp thread bundle being more closely held together. In accordance with the invention, the warp thread bundles are divided into a first (for example left) warp thread group of mutually juxtaposed warp threads and a second (for example right) warp thread group of mutually juxtaposed warp threads and the first warp thread group crosses over the second warp thread group of the same warp thread bundle for each mesh in the manner of a half-doup thread. The fact that a group of warp threads of a warp thread bundle crosses the other group of said bundle for each mesh and the load-bearing warp threads are interwoven with the weft threads in closely mutually juxtaposed relationship produces a very stable mesh fabric in which neither the warp threads nor the weft threads can be displaced. At the intersections the warp threads of both warp thread groups extend in mutually parallel relationship. There is no need for an additional doup thread for stabilization purposes. This configuration further provides that the thickness of the warp thread bundles is twice as thick as the warp threads and—viewed in plan—the warp thread bundles are on average about 50% narrower than in the case of warp threads which extend parallel. That property and the fact that the warp thread bundles and weft thread bundles are held together more firmly at the intersections provides in the case of geomeshes better intermeshing with the ground layers to be stabilized or reinforced. Because the internal cross-section of the meshes is also increased the separation effect which is unwanted particularly in the case of geomeshes is reduced.
In a preferred embodiment of the invention weaving at the intersections of the warp thread bundles to the weft thread bundles is effected in such a way that a first group of the weft threads of a weft thread bundle extends over the warp threads of the first warp thread group and under the warp threads of the second warp thread group and a second group of the weft threads of a weft thread bundle extends under the warp threads of the first warp thread group and over the warp threads of the second warp thread group. In that respect it is desirable that, of the mutually juxtaposed weft threads of a weft thread bundle, a weft thread extends alternately over a warp thread group and the respectively adjacent weft thread extends under said warp thread group.
The present invention is directed to a wide-mesh fabric treated with bonding agents that includes warp thread bundles composed of a plurality of warp threads and weft thread bundles composed of a plurality of weft threads. The warp thread bundles include a first warp thread group and a second warp thread group, and the warp thread bundles and the weft thread bundles are arranged to form internal meshes with intersections in which the warp thread bundles and weft thread bundles are arranged to extend at right angles to each other and the warp threads are interwoven with the weft threads. For each warp thread bundle, the first warp thread group is arranged to cross the second warp thread group for each mesh.
In accordance with a feature of the present invention, for each warp thread bundle, the first warp thread group is arranged to cross over the second warp thread group for each mesh. Further, the first warp thread group crosses over the second thread group in the manner of a half-doup thread.
According to another feature of the invention, the warp thread bundles are composed of a plurality of mutually juxtaposed warp threads, the weft thread bundles are composed of a plurality of mutually juxtaposed weft threads, the first warp thread group is composed of a plurality of mutually juxtaposed warp threads, and the second warp thread group is composed of a plurality of mutually juxtaposed warp threads.
Moreover, the weft t
Bült Hermann
Pintz Heiko
Greenblum & Bernstein P.L.C.
Huesker Synthetic GmbH
Ruddock Ula C.
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