DE10337397A1 - Fabric with magnetically active threads and arrangement of an upper band with such a fabric and a lower band - Google Patents

Abstract

In order to provide a magnetically attractable fabric in a relatively inexpensive yet reliable manner, magnetically active fiber components in fiber yarns, active monofilaments in multifilaments or wound magnetically active wires as a warp or weft are proposed. In addition, an arrangement comprising an upper band with a fabric according to the invention and a lower band is proposed, which has a magnetic device for straightening the upper band in a straightening area.

Description

The The invention relates to a fabric with magnetically active threads as well an arrangement of an upper band with such a fabric and Subband, the arrangement being a magnetic device for Aligning the upper band in a straightening area.

In in many areas of industrial technology Task to align tissue in a targeted manner. For example, this is at furnaces for the consolidation of large fleece Use. Here is a continuously running conveyor belt a textile fiber composite matrix is transported through the furnace. During the Transport is hot air via fans led through the fiber composite lying on the conveyor belt what Melting binding fibers and the hitherto unconnected fibers into one Verbund brings.

Around to be able to adjust the thickness of the resulting fleece mat there is an upper belt parallel to the conveyor belt, which is uniform with the conveyor belt passes the continuous furnace. Because the top band is off economical reasons often about relatively long stretches is a certain sag of the Watch the upper band regularly. As a result of sagging however, the fleece mat gets an irregular surface.

However, sagging can be avoided by making the upper band responsive to magnetic action and by providing a magnetic field in the opposite direction to the acceleration due to gravity, so that the upper band is held in a straight line. This solution results from the DE 299 00 646 U1 , in a concrete implementation of this document, magnetizable rods are used as fabric weft in the upper band. However, such an arrangement proves to be relatively expensive.

present The invention is based on the object of a cheaper alternative with at least the same To provide operational security.

This Solves task a fabric with magnetically active threads, which is characterized by that the magnetically active threads Comprise fiber yarns with at least one active fiber component, while remaining threads of the Are woven yarns.

On such tissue undoubtedly builds very inexpensively. Surprisingly, has but also emphasized that the required for many applications magnetic forces can already be achieved if fabric threads are represented by fiber yarns, in which at least one fiber component is magnetizable.

to Terminology is explained that in the present context is understood as a "yarn" any thread-like structure should be, which consists of several components, for example from individual filaments or fibers. Accordingly, the term "yarn" falls also ropes, threads, rope-like or similar structures, for example can be formed from individual yarns and / or monofilaments.

As "wire", "rod", "fiber" or "filament" are monofilaments or one-component structures understood in one or several operations spun, twisted, woven or processed in a similar way can. Here, "rods" are usually also straight in the processed state, while "wires" do not have to meet this condition. "wires" are generally distinguished from "fibers" and "filaments" by that its inherent rigidity is higher than its inherent rigidity of the wires surrounding basic structures, such as mesh or Textile ropes. In this respect, "wires" are usually relatively stiffer as "fibers" or "filaments".

"Filaments" are considered long Understand components, which in particular as long as the structure formed from you can be formed. By contrast, “fibers” are understood to mean components which especially in relation are much shorter and mostly to the entire structure only fractions of the dimensions of the structures formed from it exhibit.

“Multifilaments” are to be understood as “yarns” formed from “monofilaments”, whereby the "monofilaments", for example, among themselves stranded or similar can be processed together.

"Fiber yarns" essentially exist from "fibers", whereby of course they can also have "filaments".

By the proposed solution the magnetically active threads of the fabric get a textile-like Character. Can be advantageous the magnetically active threads thereby also as warp threads, in the case of the upper belt also in the direction of rotation of the belt his. This allows the magnetic forces in the direction of rotation of the belt Distribute spaced magnets much more evenly. The magnetic active threads can thus be provided in the weft, in the warp or in weft and warp.

In addition, the magnetically acti ven threads do not consist entirely of magnetizable material, which means that less expensive passive material can also be incorporated into the magnetically active threads. This ensures, among other things, that the magnetically active threads in their entirety, in particular with respect to the rods from the DE 299 00 646 U1 may have a significantly lower heat capacity. When used in a circulating oven, this can be of great importance for the required heat output when heating the air to be heated for the flow through the textile matrix, since only little energy flows into the rods.

The textile character of the active threads as well as the rest Has threads about that out for the mechanical stability the fabric has a particularly advantageous effect.

Uniformity and with the same basic idea of the invention the task solves a fabric magnetically active threads, where the active threads Multifilaments with at least two magnetically active filaments include while remaining threads of Are again yarns. In analogy to the proposed ones Fiber yarns as active threads multifilaments are used in this proposal. Here too can individual Filaments up to a majority of the filaments made of non-magnetizable, inexpensive Executed material as far as the respective area of application allows. Already Due to the large number of filaments, this fabric also achieves one Cloth-like Character.

Around one completely textile surface alternatively, a tissue with magnetically active Threads to Use, which is characterized by the fact that the active Threads wound magnetically active wires include. In particular, relatively stiff wires should be considered here, so that the magnetically influenceable tissue continues to have monofilament active threads can while the spinning for it Take care that the surface of the monofilament metal, or at least only in extremely small amounts Extent in direct contact with a material attached to the tissue, for example with the fleece matrix.

ever after the intrinsic rigidity of the wound wires, they can be processed be particularly accessible to the fabric by being in the weft direction available. Are particularly stiff wires it is much easier to weave as a weft than as a chain.

Of course you can also any combination of active fibers, active filaments and active braided wires are used to produce a fabric according to the invention, without deviating from the basic idea of the invention.

All three proposed types of fabric in which the active threads are textile Can have character be particularly stable as a leno fabric. Gauze are made with two warp thread systems, which makes the fabric non-slip becomes. Through a special device in the manufacture of a of such fabric, the direction of the warp alternates during the weaving process changed so that the chain is varying to the left and right of the standing thread. A tight basic chain is set by a loosely set one The leno chain is wrapped around and closes the shot so that it cannot slide on.

In an independent one advantageous embodiment of the fabric according to the invention the active threads Wire fibers or wire filaments. The wire fibers or carry wire filaments for the magnetizability of the active thread worry, however, are special easy to process. Moreover are wires economical available in many variants, so that the fabric can be adapted to a wide range of different items in an economical manner Purposes.

Are wires also flexible, which is why they are both incorporated into the chain as well as in the weft of the fabric are accessible.

In particular it is suggested that the active threads are iron fibers respectively Have iron filaments. Iron has a particularly good magnetizability and is very cheap available on the market.

Advantageous can the tissue according to the invention be at least partially coated. This way for example the strength and life expectancy of the fabric increase. An adhesion-reducing coating can also be applied, or the coating can be used as corrosion protection, especially for the active Fibers or threads, be used. This is particularly beneficial when active Threads of iron.

Preferably the coating is carried out in one step after the weaving applied, so that this operation can be carried out relatively inexpensively can and the fabric uniform and if desired gapless is coated. Through most types of coatings however, the fabric surface already smoothed whereby additionally Detention processes reduced can be.

In the inactive threads in particular Glass fibers or aramid fibers are used. Active and inactive fibers can be mixed in almost any way.

aramid and glass fibers have a relatively low heat capacity, which is especially true when used in a continuous furnace for the production of nonwovens is advantageous. Also are these materials are particularly durable when processed with metals. Moreover can Fiber yarns with aramid fibers or glass fibers are particularly flexible are produced so that such threads are particularly good as warp threads can be used.

at Extensive tests have also shown that such fabrics are very economical producible and yet outstanding in their use, in which the weft active multifilaments and the warp aramid fibers have or in which the weft threads active fiber components and the warp threads Have glass fibers. These variants are also good with each other combined.

It understand that ability of active threads or filaments to react to magnetic fields, with the density of the remaining fibers at least slightly is correlated since the others Intervene fibers in a magnetic field and weaken it or can distract. When manufacturing a fabric according to the invention, it must therefore be taken into account that the magnetic forces ultimately required in the application are reached become.

at the use of the fabric according to the invention as an upper band, which reacts to magnetic forces, is in particular to take care that often not undesirably on the below material arranged on the upper belt is to be acted on. insofar is meant to relate the active material in its quality and density the rest Fabric of the upper band and the material that is in operation under your upper band will be arranged.

at the dimensioning of the magnetically active material and the Sizing the leading Magnets is also make sure that a guide of the upper band is only required within a directional range. The exact course of the upper band outside the straightening range, for example when returning in the case of an endlessly circulating belt, on the other hand, can largely be disregarded stay.

The Invention is described below using two exemplary embodiments in the drawing explained in more detail. Here in demonstrate

1 a partial perspective view of a magnetically attractable fabric with iron monofilaments in weft threads and

2 a partial perspective view of an alternative fabric with magnetizable fibers in weft threads.

The partially shown magnetizable tissue 1 in 1 consists of multifilament weft threads 2 and fiber yarn 3 as two grouped warp threads 4 ,

The multifilament weft 2 consist of the entire length of the threads 2 continuous magnetically not activatable monofilaments (exemplarily marked with 5) and magnetizable iron monofilaments (exemplarily marked with 6). The fiber yarns 4 consist of relatively short aramid fibers (not shown in detail) and cannot be magnetized.

The mesh 1 is part of an upper belt, which is guided magnetically along a guide device within a straightening area (spatially exceeding the section shown).

The alternative tissue 10 in 2 consists of magnetically active weft threads 11 and warp threads 12 ,

The active warp threads 11 are formed by a fiber yarn, in which magnetizable fibers (not shown in detail) are incorporated. The individual fibers are relatively short, so that magnetic forces only on areas of the fiber yarn that are sometimes unevenly distributed 11 be exercised. Through the fiber composite within the threads 11 however, the magnetic force is applied to all fibers of the weft threads 11 distributed and already achieved a relatively uniform attraction.

The strings 12 consist of flexible, non-magnetizable glass fibers and magnetically active metal fibers (fibers are not shown in detail). This causes the tissue to react 10 in his weft threads 11 and in his chains 13 on a magnetic field. A particularly uniform, flat force can thus be exerted on the tissue by providing a magnetic field 10 exercise. In particular, a magnetic field also acts as a resultant force on open areas 14 between the weft threads 11 ,

Claims (12)

Fabric with magnetically active threads, characterized in that the active threads are fiber yarns with at least one active fiber compo comprise nente or multifilaments with at least two active filaments, while remaining threads of the fabric are yarns. Fabric according to claim 1, characterized in that the fabric is designed as a leno fabric. Fabric according to claim 1 or 2, characterized in that the active threads Have wire fibers or wire monofilaments. Tissue according to one of the preceding claims, characterized characterized in that the active threads iron fibers or iron filaments exhibit. Tissue according to one of the preceding claims, characterized characterized in that the remaining threads are aramid fibers exhibit. Tissue according to one of the preceding claims, characterized characterized in that the remaining threads are glass fibers exhibit. Tissue according to one of the preceding claims, characterized characterized that weft threads active multifilaments and warp threads Have aramid fibers. Tissue according to one of the preceding claims, characterized characterized that weft threads active fiber components and warp threads have glass fibers. Tissue according to one of the preceding claims, characterized through a coating on the threads. Fabric with magnetically active threads, characterized in that the active threads wound magnetically active wires include. Fabric according to claim 10, characterized in that the wound active wires as weft threads available. Arrangement from an upper band with a fabric after one of the preceding claims and from a sub-band, the arrangement being a magnetic device for straightening the top band in a straightening area.