WO2015106819A1

WO2015106819A1 - Shading device

Info

Publication number: WO2015106819A1
Application number: PCT/EP2014/050889
Authority: WO
Inventors: Klaus Bloch
Original assignee: Klaus Bloch
Priority date: 2014-01-17
Filing date: 2014-01-17
Publication date: 2015-07-23
Also published as: ES2621109T3; EP3094769A1

Abstract

The invention relates to a shading device comprising a supporting structure (1) and a fabric web (2) which can be mounted on the supporting structure (1) and is composed of interwoven warp and weft yarns (3, 4) that are based on fluoropolymer plastic materials. The warp yarns (3) are formed of warp threads (30), and the weft yarns (4) are formed of weft threads (40). At least some of the warp yarns (3) comprise warp threads (30) which are twisted together with at least one monofilament stainless steel wire (5) that reflects sunbeams so as to form the warp yarns (3); and/or at least some of the weft yarns (4) comprise weft threads (40) which are twisted together with at least one monofilament stainless steel wire (5) that reflects sunbeams so as to form the weft yarns (4).

Description

shading device

description

The invention relates to a shading device, comprising a support structure and a stretchable from the support structure fabric web of interwoven warp and weft yarns based on fluoropolymer resins, wherein the warp yarns of warp yarns and the weft yarns are formed from weft yarns.

It is already known to produce shading devices of the type mentioned at the outset from fluoropolymer plastics, in particular polytetrafluoroethylene (PTFE), and to be used, for example, as free-fall supporting structures, parasols, awnings, awnings and the like. The basis weights used for the fabric webs are generally between 300 and 2,200 g / m ² , whereby a wide variety of fabric weaves are used. PTFE yarns of 220, 380, 440, 880 and 1 .200 dtex are used here as single yarn or in twisted constructions.

Thus, for example, in the Mosque of Medina in 1992/93, twelve large screens of white paint, each with a surface area of approximately 600 m ^{2, were} installed with such PTFE fabrics as a free-fall supporting structure.

In the case of such shading devices exposed to high solar radiation, it is primarily pure PTFE that is used since, according to current knowledge, only the plastic PTFE is used in such heat and especially UV radiation. burdened regions is virtually no degradation of strength subject and a lifetime of 25 years or more can be assumed for such shading devices. In addition, reference is made to the prior art to DE 20 2006 008 868 U1 and DE 20 2012 103 389 U1.

From WO 2009/000340 A1 it is also already known to form a PTFE fabric for shading purposes in twill weave 3/3 weave with grade 2 interwoven warp and weft threads, wherein the warp threads and each three successive weft threads in a first Color and the fourth weft thread is executed in a different color. This fabric has, for example, on the upper side a purely white color and on the underside of a slightly sand-colored tint, which is extremely advantageous from the point of view of the radiation reflection and shading effect. However, the tensile strength achievable with this fabric is limited at the anticipated temperatures of, for example, 55 ° C in the direction of the warp and weft yarns, so that the size of the e.g. By means of open-space structures, there are limits.

The object of the invention is therefore to propose a shading device of the type mentioned, which has a reliable and further increased shading effect even in strong sun and heat-stressed regions and despite highest resistance to external environmental influences can be processed to particularly large-scale shading.

To achieve the object, a shading device according to the features of claim 1 is proposed.

Advantageous embodiments and modifications of the invention are the subject of the dependent claims.

The invention provides forming at least some of the warp yarns with warp yarns twisted together with at least one monofilament stainless steel wire reflecting the warp yarns; and / or forming at least some of the fill yarns to include weft yarns joined together with at least one monofilament stainless steel wire reflecting solar radiation Weft yarns are twisted.

As a result, a fabric web is obtained, which optionally in the range of some or all warp yarns in the range of some or all weft yarns or both in the range of some or all warp yarns and both some or all weft yarns introduced by twisting stainless steel wire, due to its monofilament over the entire length of the warp or weft yarns runs and in particular on the upper side of the tensioned fabric web as a reflective element of the individual Kettbzw. Weft yarns appears in appearance and gives the fabric web a high reflectivity to solar radiation, which could not be achieved so far. In order not to withstand the weathering resistance of the fluoropolymer plastics used, according to a proposal of the invention, the stainless steel wire is made of V2A or V4A stainless steel.

V2A stainless steel is understood to mean a type 1 .4301 (X5CrNi18-10) stainless steel, formerly also 1 .4300 (X12CrNi18-8). By contrast, V4A stainless steel is understood to be one which is additionally alloyed with 2% molybdenum (Mo), which makes this steel even more resistant to corrosion by chloride-containing media, e.g. Salt water makes. The general name for V4A stainless steel is 1 .4401 (X5CrNiMolybdän17-12-2).

In order not to adversely affect the production of the fabric web of interwoven warp and weft yarns based on fluoropolymer polymers, it is provided according to a further proposal of the invention to carry out the stainless steel wire in a diameter of 0.03 to 0.25 mm. Of the- Such fine stainless steel wires hinder the processing of warp and weft threads made of twisted warp or weft threads and at least one such stainless steel wire in the context of interweaving to a fabric web, but provide the desired reflectivity to sunlight.

In addition, it has been found in the invention that such fabric web made with at least some of the warp or weft yarns prepared stainless steel wires has excellent electrical conductivity, which is quite comparable to steel plates, which makes it possible to electrically conductive the fabric web with the To connect support structure and ground the support structure. It has been found within the scope of the invention that such a shading device is extremely insensitive to dust load, which hitherto represented a major problem with fabric webs of fluoropolymer plastics, in particular PTFE, due to the tendency of the PTFE yarns to become static.

If, however, the shading device designed according to the invention is used, in which the fabric web is connected in an electrically conductive manner to the support structure and the support structure is earthed, the static charge of the fabric web is completely prevented and thus the adhesion of dust and sand to the fabric web counteracted. It is thus possible to use shading devices with fabric webs in a high-whiteness design, even in heavily sand- and dust-laden regions, without fear of a rapid color deterioration as a result of sand and / or dust adhesion.

Also, the production of the same is substantially simplified by the lack of static charge of the fabric web. In addition, the inventive connection of the fabric web with the support structure in an electrically conductive design that the shading device according to the invention acts as faradayscher cage and so for example below the shading device people in a thunderstorm provides an effective and previously unrealisable protection against lightning.

In a manner known per se, the warp and weft yarns of the fabric web according to the invention can be woven into the fabric web in a cross-twill weave with a degree of gradient of 4 to 14, which results in the highest tensile strengths at 55 ° C. both in the direction of the warp yarns Also in the direction of the weft yarns and particularly high seam tear strengths can be realized, so that the shading device can be easily processed with fabric webs of extreme size, for example, an area of up to 4,000 m ² .

Advantageously, the warp and weft threads for the fabric web of the shading device according to the invention are preferably made of pure polytetrafluoroethylene in order to achieve maximum resistance. For example, they can be cut from a flat sheet material (ePTFE) in the appropriate yarn size and, depending on requirements, twisted into warp yarns or weft yarns together with at least one stainless steel wire. For example, the fabric web may comprise warp yarns of a plurality of warp yarns individually twisted in a first direction of rotation having a yarn density of from 20 to 120 yarns / cm. Yarn densities of 75 to 150 yarns / cm are also possible if the warp yarns consist only of a single twisted warp thread and the stainless steel wires are twisted together with the weft threads into the weft yarns only in the area of the weft yarns.

Suitable yarn counts for the warp and weft yarns are in the range of 220 to 440 dtex. The weft yarns according to a proposal of the invention have a yarn density of about 35 to 75 yarns / cm.

If a particularly high strength of the fabric webs used in the invention for the shading device is required to be the warp and / or weft threads twisted about their longitudinal axis in a first direction of rotation with 400 to 700 tours / m. For example, 600 turns / m are considered to be particularly suitable for the twisting of the warp threads. Also, the weft threads can be twisted individually in such a way in a first direction of rotation, with about 400 to 700 tours / m are considered advantageous here as well.

In addition, at least the weft yarns comprise a plurality of individual weft threads, which are twisted together to form the weft yarns, this twisting being effected, for example, at 200 to 450 turns / m.

If the weft threads are twisted individually in a first direction of rotation, the common twisting thereof to form the weft yarn in the opposite second direction of rotation. However, it is also possible not to twist the weft threads individually so that they are in a straight, undisplaced form. In this case, the common twisting the same to the weft yarn can be done in one of the two directions of rotation. If, according to a further embodiment of the invention, the warp yarns are formed from two or four individual warp yarns twisted in the first direction of rotation, e.g. with about 30 to 50 tours / m, preferably 35 tours / m are twisted together in the opposite direction of rotation, suitable numbers of revolutions for the twisting of the individual warp threads at 400 to 700, preferably 600 tours / m. Using these warp yarns, a high strength fabric web is obtained which significantly reduces the cost of warp manufacturing due to the use of a double or quadruple twist.

In the context of the invention, individual or all of the above-described warp yarns and / or weft yarns are also twisted together during twisting into the warp yarns or weft yarns with the addition of at least one stainless steel wire, ie, for example, to form a warp yarn, several are individually in the first direction of rotation twisted warp threads and the at least one stainless steel wire together the weft threads and at least one stainless steel wire are twisted together with the appropriate number of turns to the weft yarns. If the fabric web thus produced is to be electrically conductively connected to the support structure and the support structure is to be earthed, for example, at the edge of the fabric web a corresponding electrically conductive enclosure is provided which receives an electrical connection with the support structure and the support structure is then mounted correspondingly grounded.

According to a further embodiment of the invention, the fabric web may also have different colors on the top and bottom, which is known per se. For example, the warp yarns and n-fill yarns are made from warp or weft yarns of a first color, e.g. White formed and the following m-weft yarns have at least one weft in a color other than the first color, e.g. a sand-colored weft yarn, which is twisted together with the remaining white weft yarns of the weft yarn. In these cases n is an integer between 1 and 6 and m is an integer between 1 and 2.

Due to the particularly fine diameter of the inventively provided stainless steel wire of about 0.03 to 0.25 mm, preferably about

0.05 mm, this can be twisted into some or all of the warp and / or weft yarns during their production, if required.

The invention will be further explained with reference to an embodiment illustrative drawing. FIG. 1 is a schematic representation of a shading device according to the invention;

Figure 2 shows a warp or weft yarn for use in the shading device according to the invention. FIG. 1 shows, in a greatly simplified representation, a shading device comprising a supporting structure 1 which is for example metallic and earthed in a manner not shown here, and a fabric web 2 which can be tensioned by the supporting structure 1 and which consists of interwoven warp and weft yarns 3, 4 of fluoropolymer plastics, preferably pure PTFE.

The warp and weft yarns 3, 4 are woven, for example, in Kreuzköper 8/8 binding with pitch 6 to the fabric web 2, however, the shading device according to the invention and in particular the fabric web is not limited to this type of weave. Also suitable, for example, are twill, atlas and panama weaves. An essential feature of the fabric web 2 shown in FIG. 1 and stretched in the support structure 1 is that at least some of the warp and weft yarns, preferably in a regular arrangement, have a structure which can be seen in FIG. The individual warp and weft yarns 3, 4 are in this case of several, here three twisted together warp threads 30 or in the case of a weft yarn 4 from corresponding weft threads 40, in a manner not shown initially individually with, for example, 600 tours / m in one twisted first direction and then twisted together with 400 tours / m against the first direction of rotation, ie in the second direction of rotation. In addition to the twisted warp threads 30 or weft threads 40, in each case a monofilament and sun-ray reflecting stainless steel wire 5 together with the warp threads 30 or weft threads 40 are twisted into the warp yarn 3 or weft yarn 4, so that this at regular intervals on the surface of the warp yarns 3 or weft yarns 4 appears in appearance. The remaining warp yarns 3 or weft yarns 4 have an identical construction, but here the incorporated stainless steel wire 5 is missing. It is of course also possible to provide all warp and weft yarns 3, 4 with twisted stainless steel wire 5.

The stainless steel wire may for example be made of V4A stainless steel with a diameter of 0.05 mm.

Due to the presence of the precious wire 5 at surface portions of the warp and weft yarns 3, 4, the processability, i. in particular their wearability to the fabric web impaired in any way, for which the high alternating load capacity of the precious wire 5 and its extremely fine diameter significantly responsible.

In addition, the incorporated monofilament stainless steel wires not only give the fabric web 2 its superior ability to reflect solar radiation, but also impart an extremely high electrical conductivity, which makes it possible, in conjunction with a correspondingly grounded support structure 1 and an electrically conductive connection between the fabric web 2 and the support structure 1 any derive in the fabric web 2 resulting electrostatic charge directly dissipate, so that a caused by electrostatic charge charge adhesion of dust, sand and other particles on the surface of the fabric web 2 is effectively counteracted. It has also been found that such a fabric web 2 is already much easier to process even during the production of the same, since any formation of static charge is already prevented in the beginning, which is, for example, in the beginning. the handling in the loom and the subsequent assembly enormously simplified.

In addition, such a shading device formed with a grounded support structure 1 and electrically connected fabric web 2 at the same time also a Faraday cage and ensures effective protection against lightning, for example. during a thunderstorm.

The type and number of precious ray wires within a single warp yarn and the selection of the number of warp yarns provided with the stainless steel wire in the context of the entire fabric web as well as the type and number of weft yarns provided with the stainless steel wire in the context of the entire fabric web is freely selectable by the skilled person depending on the application. Moreover, a fabric web produced in this way is not only suitable for a shading device according to the invention, but also individually or in combination with other manmade fibers for a multiplicity of further applications. For example, automotive cover materials, filter fabrics for dust-laden media, eg hot gas filtration devices, as well as applications in solid-liquid separation, eg vacuum belt filters, for example in the food and pharmaceutical sector, as well as illuminated ceilings, are conceivable.

Claims

A shading device comprising a support structure (1) and a fabric web (2) which can be tensioned by the support structure (1) made of interwoven warp and weft yarns (3, 4) based on fluoropolymer plastics, wherein the warp yarns (3) consist of warp threads (30) and the weft yarns (4) are formed from weft threads (40) and

• at least some of the warp yarns (3) comprise warp threads (30) twisted together with at least one monofilament and sun-ray reflective stainless steel wire (5) to the warp yarns (3); and or

• at least some of the weft yarns (4) comprise weft threads (40), which are twisted together with at least one monofilament and sun-ray reflecting stainless steel wire (5) to the weft yarns (4).

Shading device according to claim 1, characterized in that the stainless steel wire (5) is made of V2A or V4A stainless steel.

Shading device according to claim 1 or 2, characterized in that the stainless steel wire has a diameter of 0.03 to 0.25 mm.

Shading device according to one of claims 1 to 3, characterized in that the fabric web (2) is electrically conductively connected to the support structure (1) and the support structure (1) is grounded.

Shading device according to one of claims 1 to 4, characterized in that the warp and weft yarns (3, 4) in cross-twill Bonded with a grade of 4 to 14 to the fabric web (2) are interwoven.

6. Shading device according to one of claims 1 to 5, characterized in that the warp and weft threads (3, 4) are formed from polytetrafluoroethylene.

Shading device according to one of claims 1 to 6, characterized in that the fabric web (2) warp yarns (3) comprises a plurality of individually twisted in a first direction of warp warp yarns (30) a yarn density of 20 to 120 yarns / cm.

Shading device according to one of claims 1 to 6, characterized in that the fabric web (2) warp yarns (3) from a single twisted in a first direction of warp yarn (30) a yarn density of 75 to 150 yarns / cm comprises.

Shading device according to one of claims 1 to 8, characterized in that the individual warp and weft threads (30, 40) have a thread thickness of 220 to 440 dtex.

Shading device according to one of claims 1 to 9, characterized in that the fabric web (2) weft yarns (4) comprises a plurality of weft threads (40) which are individually twisted in a first direction of rotation and are twisted together against the first direction of rotation.

Shading device according to one of claims 7 to 10, characterized in that for forming a warp yarn (3) a plurality of individually twisted in the first direction of warp threads (30) and at least one stainless steel wire (5) are twisted together against the first direction of rotation.

12 shading device according to claim 1 1, characterized in that for forming a warp yarn (3) two or four individually twisted in the first direction of warp threads (30) and at least one stainless steel wire (5) together with 30 to 50 tours / m against the first Direction of rotation are twisted.

Shading device according to one of claims 1 to 12, characterized in that the weft yarns (4) have a yarn density of 35 to 75 yarns / cm.

Shading device according to one of claims 1 to 13, characterized in that weft threads (40) and at least one stainless steel wire (5) with 200 to 450 turns / m are twisted together to the weft yarns (4).

Shading device according to one of claims 1 to 14, characterized in that the fabric web (2) comprises warp yarns (3) and n-weft yarns (4) comprising warp or weft yarns (30, 40) of a first color and the following m Weft yarns (4) have at least one weft thread (40) in a different color from the first color.

16. Shading device according to claim 15, characterized in that n is an integer between 1 and 6 and m is an integer between 1 and 2.