DE102008060226A1 - Method for manufacturing backing fabric utilized for manufacturing e.g. bellows for articulated bus, involves interweaving plastic monofilament with plastic monofilament as warp thread-and weft thread at backing fabric - Google Patents

Abstract

The method involves cabling a plastic monofilament (1) around a longitudinal axis in a rotation direction with a pre-determined speed of rotation per warp thread-and weft thread. The plastic monofilament is twisted together with a filament yarn (2) in a rotation direction that is opposite to the former rotation direction. The plastic monofilament twisted with the plastic monofilament is interwoven as a warp thread-and weft thread at the backing fabric. The number of the plastic monofilament and the filament yarn is selected in a corresponding manner per warp thread-and weft thread. An independent claim is also included for a backing fabric comprising a warp thread-and weft thread.

Description

The The invention relates to a process for producing one from each other interwoven warp and weft threads formed carrier fabric. Furthermore, the invention also relates to such from each other interwoven warp and weft threads formed carrier fabric and uses thereof.

It is known for the production of bellows for z. B. articulated buses as well for the production of inflatable boats and conveyor belts of a belt conveyor base fabric to be used on the basis of plastic multipiles, in which the plastic multilif as warp and weft threads together be woven. Subsequently, this carrier fabric is applied to at least one, preferably coated on both sides with an elastomer composition, for example, provided by coating with a rubber coating. For bellows for articulated buses or high-grade inflatable it is even common to use a sandwich material, consisting of two or three such carrier fabrics, which have a gum connected to each other and on their outer surfaces again with a rubber coating are provided, d. H. a five- or seven-layer composite of two or three carrier fabrics and three or four To use gumming layers. This sandwich construction takes place in particular from the point of view that the bellows or the Dinghy must have a certain inherent rigidity. A disadvantage of this proven construction, however, are the high costs, especially due to the three- to four-layered Application of the rubber coating by brush is conditional.

task The invention is therefore a method for producing a carrier fabric formed from interwoven warp and weft threads to propose, in which the carrier fabric a has particularly high rigidity and in particular for the production of bellows, inflatable boats and conveyor belts is suitable, due to the high inherent rigidity on a multilayer Sandwich construction with several layers of the carrier fabric and accordingly high number of elastomer layers are omitted if possible should.

These The object is achieved by a Method and a carrier fabric according to the characteristics the independent one claims 1 and 9 solved.

advantageous Embodiments and developments of the invention are the subject the dependent Claims.

Of the inventive proposal based on it, the carrier fabric in that to form the warp and weft threads respectively at least one plastic monofilament in a first step around his longitudinal axis twisted in a first direction of rotation with a predetermined number of revolutions and in a second subsequent step together with at least one filament yarn in a direction opposite to the first direction of rotation Direction of rotation is twisted with the specified number of turns. The thus obtained warp and weft threads, each consisting of a plastic monofilament twisted with a filament yarn can then to the carrier fabric be woven.

by virtue of the fact that in the first step of the method according to the invention the plastic monofilament first Twisted in a first direction of rotation with the specified number of turns and then together with the filament yarn in a first direction of rotation twisted in the opposite direction of rotation with the same number of turns, lies the plastic monofilament after twisting with the Filament yarn again in untwisted, d. H. rectilinear alignment along its longitudinal axis before, because in the first step in a first direction of rotation caused Twisting with the specified number of turns by the subsequent twisting in the opposite direction of rotation and with the same number of turns Completely turned back becomes. However, this winds up with the turned back plastic monofilament twisted filament yarn in longitudinal extension of the monofilament around its outer surface in the second direction of rotation with the specified number of turns around, so that ultimately the plastic monofilament in a straight line orientation as core finds itself in an untwisted state and completely with the twisted filament yarn is wrapped so that it is on the surface of the sun obtained warp or weft thread and the producible therefrom base fabric is no longer visible.

To the interweaving of such produced warp and weft threads in a known weave, which imposes no special limitation is, receives one extremely hard and rigid fabric, which is a higher strength compared to the prior art and has inherent rigidity and higher tear propagation resistance and cut resistance.

These Properties are when using the carrier fabric according to the invention in a bellows z. B. in terms of resistance across from Vandalism beneficial, boost when used in a dinghy You the strength over grounding Etc.

If the Trä gergewebe for bellows, inflatable boats or conveyor belts should be used, it is only necessary because of the high inherent stiffness of the carrier fabric to provide this on at least one, preferably both surfaces, each with a coating layer of elastomeric material, so that overall the costs are significantly reduced.

To A proposal of the invention will be used to train each one Warp and weft thread several plastic monofilaments together in one twisted first step and then with a filament yarn twisted or the at least one plastic monofilament is made with several Filament yarns twisted together.

To Another proposal of the invention is the number of plastic monofilaments and the filament yarns per warp and / or weft each match selected.

meaningful be within the scope of the invention, numbers of one to four, preferably two monofilaments and a corresponding number of filament yarns viewed per warp and weft.

The Plastic monofilaments used in the context of the invention show evidence a proposal of the invention a diameter of 0.18 to 0.40 mm, preferably 0.25 mm, while the filament yarns used with a thread thickness of 460 to 3300 dtex become.

The Plastic monofilaments and / or filament yarns are by design of the invention made of a polyester or polyamide, wherein prefers a varietal match Material selection for the plastic monofilaments and the filament yarns are hit.

Provided the filament yarns are made of a polyester, these are according to another proposal of the invention in a thread thickness of 550 to 3,300 dtex, preferably 1,100 dtex executed. Unless the filament yarns are made of a polyamide, the thread thickness is about 460 to 2,820 dtex, preferably 940 dtex.

in the Meaning of the invention not just plastic monofilaments and / or filament yarns from a pure one Polyester, but also of modified polyesters for use come.

The Number of revolutions, with which the plastic monofilaments in the first direction of rotation twisted and then in common with the filament yarns in the second opposite Are twisted direction of rotation, according to a proposal of the invention between 50 and 500 tours / m, preferably at about 200 tours / m. Under the Unit tours / m will be within the meaning of the invention a number of revolutions per running meter in the longitudinal direction understood the plastic monofilaments.

The Use of polyester as starting material for the plastic monofilaments and / or Filament yarns are particularly suitable for general applications, while the use of polyamide may be useful, in particular for carrier fabrics, which are highly loaded, for example in the corner of a bellows be used because the bellows here exposed to high tensile stress is.

Further Embodiments and details of the invention are described below based on the various embodiments drawing closer explained. Show it:

1 a thread usable as a warp or weft thread for producing a carrier fabric according to the invention according to a first embodiment of the invention;

2 a thread usable as warp or weft thread for producing a carrier fabric according to the invention according to a second embodiment of the invention;

3 the first step of the process according to the invention for producing a carrier fabric;

4 the second step of the process according to the invention for producing a carrier fabric.

From the 1 is a thread visible as a warp and weft thread to a carrier fabric z. B. can be woven for a bellows in a conventional manner. The Indian 1 apparent thread consists of a core forming plastic monofilament 1 which z. B. is made of a polyester and extending in untwisted rectilinear alignment along its longitudinal extent L. To this plastic monofilament 1 as a core is a filament yarn 2 along the longitudinal extent L and in the illustration according to 1 wrapped in a counterclockwise direction so that it forms a jacket and that of the plastic monofilament 1 formed core is no longer visible. The chosen representation in the figures is schematic for the sake of clarity, but in fact is the filament yarn 2 firmly forming a closed shell around the plastic monofilament 1 wound.

In one in the 2 illustrated alternative embodiment are two parallel, but even if untwisted plastic monofilaments 1a . 1b jointly intended as a core and of two filament yarns 2a . 2 B wrapped together along its longitudinal axis L.

If the thus formed threads according to 1 or 2 are woven as warp and weft threads to a carrier fabric in a conventional manner, to obtain a particularly hard and rigid dimensionally stable fabric which has high tear strength and high cut resistance and is particularly suitable for the production of bellows, inflatable boats or Fordergurten a belt conveyor. For this purpose, the carrier fabric produced in this way can be coated on both sides with an elastomeric composition, for example by coating in a coating process.

From the 3 and 4 is the example of the thread according to 1 its preparation in two consecutive steps illustrates.

First, the plastic monofilament 1 , which is untwisted, as shown in the 3 in a first direction of rotation S, here clockwise, with a predetermined number of revolutions of z. B. 200 tours / m in the longitudinal extension of the monofilament 1 twisted.

Subsequently, the so-twisted plastic monofilament 1 , like from the 4 visible, together with a twisted plastic monofilament 1 parallel filament yarn 2 in the first direction of rotation opposite direction of rotation Z, here counterclockwise, with the same number of turns, ie in the example given with 200 tours / m in the longitudinal direction of the monofilament 1 twisted.

Since the two directions of rotation S and Z in the 3 and 4 The two consecutive process steps are opposite and the respective number of revolutions coincides in both directions, thus the plastic monofilament when twisting with the filament yarn 2 in its untwisted starting position according to 3 Turned back while the filament yarn 2 in the direction of rotation Z with the predetermined number of revolutions along the longitudinal axis L of the plastic monofilament 1 wraps around the surface and thus the configuration according to the 1 is obtained.

The same applies mutatis mutandis to the embodiment according to the 2 by using two initially untwisted plastic monofilaments 1a . 1b twisted together in the first direction of rotation S and then with two filament yarns 2a . 2 B be twisted in the opposite direction of rotation Z, the plastic monofilaments 1a . 1b be turned back into their untwisted starting position and the configuration according to 2 results. The plastic monofilaments 1a . 1b can be identical to the plastic monofilament 1 be constructed, as well as the filament yarns 2a . 2 B to the filament yarn 2 , But it can also be made an adjustment of the diameter used to make the total thickness of the wearable carrier fabric comparable.

Of the One skilled in the art will recognize that this procedure also differs Number of plastic monofilaments, for example, three, four or more such plastic monofilaments and corresponding number of filament yarns and it is also possible the number of plastic monofilaments and filament yarns used as well different from each other.

In every case receives in this way as warp and weft threads for a carrier fabric suitable threads, at the plastic monofilaments in the core with 0 tours / m find themselves and on the surfaces of the carrier tissue are no longer visible.

Embodiment:

For one z. B. used in articulated buses bellows were Kett- and weft threads prepared by each two parallel monofilaments of polyethylene terephthalate (PET) each with a diameter of 0.25 mm with 200 tours / m twisted together in a first direction of rotation and then together with two PET filament yarns each each with 1,100 dtex in the opposite direction with also 200 tours / m were twisted.

From the warp and weft yarns obtained in this way, a support fabric with 6.5 / 6.5 threads / cm in warp and weft direction was woven in a canvas L1 / 1 weave, which had a basis weight of 500 g / m ² .

The Strength of the carrier fabric thus obtained in the warp direction was 5,250 N / 5 cm with an elongation at break of 27% and in weft direction 5,300 N / 5 cm with a breaking elongation of 23%.

By subsequent coating of the top and bottom of the carrier fabric with a suitable rubber coating was a bellows with excellent Get properties.

Claims (17)

A method for producing a carrier fabric formed from interwoven warp and weft threads, characterized in that at least one per warp and / or weft Plastic monofilament ( 1 ) is twisted in a first step about its longitudinal axis (L) in a first rotational direction (S) with a predeterminable number of revolutions and in a second step together with at least one filament yarn ( 2 ) is twisted in a direction of rotation (Z) opposite to the first direction of rotation (S) with the predetermined number of revolutions, and then that with the filament yarn ( 2 ) pliable plastic monofilaments ( 1 ) are woven as warp and weft threads to the carrier fabric. A method according to claim 1, characterized in that per warp or weft a plurality of plastic monofilaments ( 1a . 1b twisted together in a first step and then with a filament yarn ( 2 ) are twisted and subsequently woven as warp and / or weft threads to the carrier fabric. Method according to claim 1 or 2, characterized in that the at least one plastic monofilament ( 1 . 1a . 1b ) with several filament yarns ( 2a . 2 B ) is twisted together and subsequently woven as warp and / or weft threads to the carrier fabric. Method according to one of claims 1 to 3, characterized in that the number of plastic monofilaments ( 1 ) and the filament yarns ( 2 ) is selected consistently per warp and / or weft threads. Method according to one of claims 1 to 4, characterized in that plastic monofilaments ( 1 ) of a diameter of 0.18 to 0.40 mm, preferably 0.25 mm. Method according to one of claims 1 to 5, characterized in that filament yarns ( 2 ) are used with a thread thickness of 460 to 3,300 dtex. Method according to one of claims 1 to 6, characterized in that plastic monofilaments ( 1 ) and / or filament yarns ( 2 ) are used from a polyester or polyamide. Method according to one of claims 1 to 7, characterized that the tour number is between 50 and 500 per meter, preferably 200 per meter in the longitudinal axis direction (L) is. Carrier fabric comprising interwoven warp and weft threads, characterized in that the warp and / or weft threads each comprise at least one plastic monofilament core, which is oriented untwisted along its longitudinal axis and having at least one filament yarn forming a sheath ( 2 ) in a predeterminable number of revolutions along the longitudinal axis of the at least one plastic monofilament ( 1 ) is wrapped. Carrier fabric according to claim 9, characterized in that as the core of the warp and / or weft threads several plastic monofilaments ( 1a . 1b ) are arranged in parallel and together with at least one filament yarn forming the sheath ( 2 ) are wrapped. Carrier fabric according to claim 9 or 10, characterized in that the number of plastic monofilaments ( 1 ) and filament yarns ( 2 ) matches per warp and / or weft. Carrier fabric according to one of claims 9 to 11, characterized in that the plastic monofilaments ( 1 ) have a diameter of 0.18 to 0.40 mm, preferably 0.25 mm. Carrier fabric according to one of claims 9 to 12, characterized in that the filament yarns 2 have a thread thickness of 460 to 3,300 dtex. Carrier fabric according to one of claims 9 to 13, characterized in that the filament yarns ( 2 ) and / or the plastic monofilaments ( 1 ) are made of polyester or polyamide. Carrier fabric according to one of claims 9 to 14, characterized in that the filament yarns ( 2 ) with 50 to 500 tours per meter around the at least one plastic monofilament ( 1 ) are wound. base fabric according to one of the claims 9 to 15, characterized in that it is at least on one of its surfaces coated with an elastomer composition. Use of a carrier fabric according to a the claims 9 to 16 for Bellows, inflatable boats or conveyor belts a belt conveyor.