DE102011006405A1 - Fabric for protecting e.g. window against penetration of insects in building, has mesh formed from leno, standing and weft threads, where stiffness of mesh in weft direction is matched with stiffness of weft threads in warp direction - Google Patents

Abstract

The fabric has a flexible insect protection mesh (12) formed from leno threads (20), standing threads (18) and weft threads (16), which are connected with one another in a leno weave. The parallel weft threads extend in pairs as the leno and standing threads by leaving grid openings (24), where the leno and standing threads entangle a warp thread pair (22). Bending stiffness of the mesh in a weft direction is matched with bending stiffness of the weft threads in the warp direction. Thread cross sections of the leno and standing threads deviates less than 20 percent from each other.

Description

The invention relates to a fabric for shielding openings such as windows or doors against the ingress of insects with a windable or extensible flexible mesh fabric, which is formed from leno weave interconnected leno threads, ground threads and weft threads, wherein the mutually parallel weft threads in pairs as Kettfadenpaar interweave twisting leno threads and stiffener threads, leaving lattice openings free.

In such insect protection devices as inconspicuous as possible optics or a good view and a high air flow should be maintained, at the same time the tissue openings must be so small that even small insects such as mosquitoes can not slip through. For this purpose, conventionally plastic-coated fiberglass fabrics are used in plain weave. A fiberglass thread ensures the stability and tear resistance of the fabric, while a plastic coating should enable the UV and weather protection, the coloring and the cross-point welding of the fabric. In order to achieve an additional shielding of electromagnetic radiation, was in the DE-A 10153248 already proposed to interweave shielding wires made of stainless steel wire with a warp thread in leno weave. The Abschirmfäden should be almost an order of magnitude thinner than the warp threads, which makes the production and installation of such a fabric very complex.

Proceeding from this, the object of the invention is to further improve the insect protection devices known from the prior art and to provide an improved insect protection fabric for this purpose, which offers particular manufacturing and use advantages.

To solve this problem, the combination of features specified in claim 1 and 4 is proposed. Advantageous embodiments and modifications of the invention will become apparent from the dependent claims.

The invention is based on the idea that the behavior of use of a fabric is decisively determined by its bending properties. Accordingly, the invention proposes that the bending stiffness of the mesh fabric in the weft direction substantially coincides with its bending stiffness in the warp direction. As a result, a largely isotropic fabric is created in leno weave, which remains largely free from distortion during retraction into frame systems or rolls much more uniformly in a roller blind system.

Even with the latter, there is no distortion in the tissue and, above all, no migration of the tissue on the winding shaft. This plays a special role in a comparatively open fabric with particularly thin threads, as it is particularly preferred in insect protection. The leno weave offers further advantages due to the high resistance to displacement, which can already be achieved without additional fixing means. In addition to the symmetrical mechanical behavior, a special optical uniformity is ensured, so that such a tissue is no longer disturbing in front of a building opening.

For further improvements in this regard, it is advantageous if the thread cross-sections (i.e., thread cross-sectional areas) or finenesses of the leno and ground threads deviate less than 20%, and more preferably less than 10%.

It is also favorable if the individually running weft threads have a larger, preferably approximately twice as large, thread cross-section than the pairs of leno and ground threads. If multifilaments are used, the fineness of the weft should be correspondingly greater than the fineness of the leno and ground threads.

Another aspect of the invention is that the thread cross-sections or finenesses of the leno and ground threads differ less than 20% from each other, and that the weft threads have a larger thread cross-section or a greater fineness than the leno and ground threads.

Advantageously, the thread diameter of the weft threads is between 0.08 and 1 mm. Accordingly, the fineness should be designed for multifilament yarns.

For insect protection purposes, it is advantageous if the preferably square grid openings have a clear width or width in the range between 0.5 and 3 mm.

In order to achieve a special optical uniformity, the pairs of warp threads formed in each case from a leno thread and a ground thread should on average be approximately the same thickness as the weft threads.

Also for a simplified fabric production, it is advantageous if the leno threads and ground threads are formed from a single thread material. Here, the leno threads, ground threads and weft threads from monofilaments, multifilaments or bicomponent yarns may be formed.

For additional tissue consolidation, it is advantageous if the weft threads and the Kettfadenpaare are connected at their common crossing points, preferably by bonding or welding cohesively together.

A further improvement provides that the mesh fabric is solidified by a coating, wherein the grid openings remain free.

To simplify the use on site, it is advantageous if the mesh fabric is guided laterally in a roller guide or stretched flat in a tenter frame.

In the following the invention will be explained in more detail with reference to an embodiment shown schematically in the drawing. Show it

1 an insect protection device provided as a tensioning frame with an insect protection fabric for insertion into a window opening in a perspective view;

2 the insect protection fabric formed in leno weave in partial plan view.

In the 1 illustrated insect protection device can be outside hook in front of a building window to prevent the ingress of insects, but without significantly affecting the view to the outside and the passage of air. For this purpose, the device comprises a rectangular frame composed of profile legs clamping frame 10 , an insect protection fabric woven in a three-dimensional weave spread over it in a flat weave 12 as well as in the corner areas of the clamping frame 10 arranged hanging straps 14 , Details of the mounting principle will be apparent from the DE 197 49 517 , which is hereby incorporated by reference.

The clamping frame 10 has a piping groove for clamping the fabric 12 and can be connected by a peripheral seal (not shown) in the suspended state outside on a window frame of the window insect-tight, with a simple disassembly, for example, when not in use over the winter time is possible. Correspondingly adapted frame variants can also be used for other building openings, for example in front of doors or light shafts. Further uses arise through roller blind structures in which the insect protection fabric 12 is held in the form of a roll-up fabric web in side guide rails. For such an execution is on the DE 19639478 Referenced. It is also conceivable to hang the insect protection fabric in lamellar tracks on a holder, for example in front of exterior doors. As a particularly simple holder and a tape or Velcro is conceivable.

As in the schematic diagram 2 Illustrated is insect repellent tissue 12 as a leno fabric from weft threads 16 , Steherfäden 18 and leno threads 20 educated. The stayer and leno threads wrap around in pairs as Kettfadenpaar 22 , In the view shown are the Steherfäden 18 always above the leno threads 20 while the leno threads 20 over the top of the weft threads 16 and the Steherfäden 18 run under the bottom. The warp thread pairs extending in a warp direction 22 The weft threads running parallel to one another in the lateral spacing intersect 16 right-angled, leaving between them grid openings 24 remain free.

To achieve special handling and use advantages, the thread systems 16 . 18 . 20 designed so that the flexural rigidity of insect repellent fabric 12 in the weft direction, ie in the longitudinal direction of the weft threads 16 , substantially coincides with its bending stiffness in the warp direction.

The bending stiffness can be determined by the cantilever method (cantilever method). Here, the bending behavior is determined based on the weight. The test is carried out after DIN 53362 in which a bending length is determined in which the tissue sample is bent down by a defined angle due to its own weight.

Advantageously, the weft threads 16 an approximately twice as large cross-sectional area as the stayer and leno threads 18 . 20 while the latter are substantially coincident in cross-section. Suitably, the thread diameter of the weft threads 16 between 0.08 and 1.0 mm.

On the one hand to ensure the required insect impermeability and on the other hand, the light transmission does not unnecessarily limit the tissue openings 24 have a clear width of about 0.5 to 3.0 mm.

Preferably, the tissue exists 12 made of monofilament threads 16 . 18 . 20 , with round cross-section and uniform material. As a low-cost thread material is offered to plastics from the family of polyester.

In principle, multifilament yarns can also be used instead of monofilaments. Such multifilaments usually have no round diameter due to the loose composite of their individual filaments. Therefore, instead of the diameter, the fineness of such a yarn in tex (Tt) indicated. This size indicates the yarn mass in grams related to a yarn length of 1000 m (1 tex = 1 g / 1000 m). The Tex system is part of the SI unit system. The fineness is measured z. B. according to the Weifverfahren ( DIN EN ISO 2060 ). For perfectly round threads such as monofilaments, the fineness can be converted by the density ρ of the material into the diameter d according to the following equation: d = 2 × (Tt / (1000 × π × ρ)) ^1/2 .

To further improve the fabric strength, the weft threads can 16 and the warp thread pairs 22 at their common crossing points 26 cohesively connected to each other. For this purpose, an adhesive can be applied and cured, for example, by spraying, dipping, foam impregnation or other coating methods. It is also conceivable, the intersections 26 to merge or weld. In principle, multicomponent yarns could also be used in which meltable threads or thermoplastics with different melting temperatures are already present in the yarn.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10153248 A [0002]
• DE 19749517 [0020]
• DE 19639478 [0021]

Cited non-patent literature

• DIN 53362 [0024]
• DIN EN ISO 2060 [0028]

Claims (12)

Fabrics for shielding openings such as windows or doors against the ingress of insects with a windable or extensible flexible mesh fabric ( 12 ), which are made of leno threads ( 20 ), Steherfäden ( 18 ) and weft threads ( 16 ) is formed, wherein the mutually parallel weft threads ( 16 ) in pairs as Kettfadenpaar ( 22 ) encircling leno and ground threads ( 18 . 20 ) under the provision of grid openings ( 24 ), characterized in that the flexural rigidity of the mesh fabric ( 12 ) in the weft direction substantially coincides with its bending stiffness in the warp direction. Sheet material according to claim 1, characterized in that the thread cross-sections or finenesses of the leno and ground threads ( 18 . 20 ) are less than 20% different. Sheet according to claim 1 or 2, characterized in that the weft threads ( 16 ) has a larger, preferably about twice as large, thread cross-section than the leno and ground threads ( 18 . 20 ). Fabrics for shielding openings such as windows or doors against the ingress of insects with a flexibly openable or tensioned flexible mesh fabric ( 12 ), which are made of leno threads ( 20 ), Steherfäden ( 18 ) and weft threads ( 16 ) is formed, wherein the mutually parallel weft threads ( 16 ) in pairs as Kettfadenpaar ( 22 ) encircling leno and ground threads ( 18 . 20 ) under the provision of grid openings ( 24 ), characterized in that the thread cross-sections or finenesses of the leno and ground threads ( 18 . 20 ) differ less than 20% and that the weft threads ( 16 ) a larger thread cross section or greater fineness than the leno and ground threads ( 18 . 20 ). Sheet according to one of claims 1 to 4, characterized in that the thread diameter of the weft threads ( 16 ) is between 0.08 and 1 mm. Sheet according to one of claims 1 to 5, characterized in that the preferably square grid openings ( 24 ) have a clear width in the range between 0.5 and 3 mm. Sheet according to one of claims 1 to 6, characterized in that each of a leno and a stationary thread ( 18 . 20 ) formed Kettfadenpaare ( 22 ) on average about the same thickness as the weft ( 16 ) are. Sheet according to one of claims 1 to 7, characterized in that the leno threads ( 20 ) and ground threads ( 18 ) are formed of a uniform thread material. Sheet according to one of claims 1 to 8, characterized in that the leno threads ( 20 ), Steherfäden ( 18 ) and weft threads ( 16 ) are formed from monofilaments, multifilaments or bicomponent yarns. Sheet according to one of claims 1 to 9, characterized in that the weft threads ( 16 ) and the warp thread pairs ( 22 ) at their common crossing points ( 26 ) are preferably connected by adhesive bonding or welding together. Sheet according to one of claims 1 to 10, characterized in that the mesh fabric ( 12 ) is solidified by a coating, wherein the grid openings ( 24 ) remain free. Sheet according to one of claims 1 to 11, characterized in that the mesh fabric ( 12 ) guided laterally in a roller guide or in a tenter ( 10 ) is stretched flat.

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