WO2005021863A1

WO2005021863A1 - Rope element with twisted or braided structure and rope comprising a corresponding rope element

Info

Publication number: WO2005021863A1
Application number: PCT/AT2004/000290
Authority: WO
Inventors: Klaus Kronlachner; Georg Sonnleitner; Erich Scheuringer; Rudolf Kirth
Original assignee: Teufelberger Ges.M.B.H.
Priority date: 2003-08-22
Filing date: 2004-08-20
Publication date: 2005-03-10

Abstract

The invention relates to a rope element (2, 11) having a twisted or braided structure and comprising a core (3) and a jacket (5), whereby the core (3) and the jacket (5) consist of different synthetic materials. The jacket (5) comprises multifilaments (8; 10) and/or staple fiber yarns (7; 9). Twisted ropes, especially industrial ropes, e.g. paper guiding ropes, can be produced using at least one rope element (2, 11) according to the invention.

Description

Rope element with a twisted or braided structure and a rope having such a rope element

The invention relates to a rope element with a rotated or braided structure, with a core and a jacket, the core and the jacket having different plastic materials.

Furthermore, the invention relates to a twisted rope, in particular industrial rope, e.g. Paper guide rope.

In the context of the present invention, rope element is not only to be understood as a strand which is stranded with other strands to form a finished rope, but also any subunit of a rope which is stranded with other rope elements to form a finished rope, i.e. in particular also an element of a strand.

From US 4,563,869 A a ship rope made of plastic is known, in which two different plastic materials are provided, which have a different elongation behavior. In this way, a simultaneous tearing off of all rope elements and thus the entire ship rope under great load is to be avoided.

From EP 808 943 B1, a special braided rope made of round braided textile fiber material is known for taking along and passing on paper webs in the manufacture of paper and cardboard on paper machines, in which raised areas are formed at regular or irregular intervals over the rope circumference, the raised areas being formed due to a different multifilament of the fiber and / or yarn elements in different running directions, due to a different structural design through the use of twisted fiber elements or due to different types of fibers in the different running directions. In the raised areas there are mainly profiled fibers or crimped multifilament yarns. From DE 22 22 312 A a plastic rope is known which consists of mainly load-bearing plastic threads, which are to be designed specifically in the form of stretched monofilaments, and of deposits or sheathing, which are formed from highly stretchable, but not or not fully stretched materials. Specifically, these are also threads or monofilaments made of plastic or metal, in particular aluminum. In the event of an overload break in the rope, these threads or monofilaments are intended to reduce the potential energy present when the mainly load-bearing plastic threads break.

EP 1 004 700 A2 discloses a rope constructed from synthetic fiber strands, the strands of which are provided with a covering which is formed from a liquid which contains UV stabilizers and optionally also short fibers for protection against abrasion.

It is an object of the invention to provide a rope element or rope of the type mentioned at the outset which, in comparison to known rope elements or ropes, has good elongation properties, i.e. has a lower elongation and a long service life or good grip properties.

The rope element of the type mentioned at the outset is characterized in that multifilaments and / or staple fiber yarns are provided in the jacket of the rope element. The provision of multifilaments leads to a long service life, and surprisingly relatively good grip properties can also be achieved; these grip properties are additionally improved or optimized if staple fiber yarns are provided in the sheath - preferably additionally, but possibly also without multifilaments. The core can easily be equipped or constructed in such a way that the entire rope element is stretched slightly. If only multifilaments are arranged in the sheath, the grip properties will not be as good as with a combination of multifilaments and staple fiber yarns are achieved in the sheath, however, such a rope has particularly good elongation properties, ie an extremely low elongation, which further enhances the achievement of a long service life. If, on the other hand, only staple fiber yarns are provided in the sheath, the sheath does not contribute to an increase in the service life compared to an embodiment in which multifilaments are also provided in the sheath, but extraordinarily good grip properties can be achieved in this way. Accordingly, in the rope element according to the invention, the proportion of the staple fiber yarns or the multi-filament filaments in the sheath can be selected accordingly depending on the intended use, ie on the desired grip properties or the desired service life of the rope element. Multifilaments are strands that are formed from a large number of continuous fibers.

For a particularly long service life or particularly good grip properties of the rope element, it is advantageous if multifilaments and / or staple fiber yarns made of polyamide are provided in the sheath.

In order to create a rope element with a long service life that also has good grip properties, it is advantageous if the sheath has at least two different materials, the one material, which may be in the form of multifilaments, having a longer service life than that other material, which may be in the form of staple fiber yarn. To determine the service life of a material, a rope made of the material to be tested is run in a so-called running test at a defined humidity and temperature over a standing metallic shaft, which simulates the operation of the rope when running over rollers. Here, the running time until the tear or up to a great length of the rope (beyond the machine path) is measured.

In order to ensure a low elongation of the rope element, it is advantageous if the core has a material with an elongation at break of ≤20%, in particular ≤15%.

In view of the low elongation of the rope element, it is too It is advantageous if a material with a wet elongation ≤105% of the dry elongation, preferably in the form of multifilaments, is provided in the core.

In particular, a low elongation and a long service life of the rope element are achieved if polyester, aromatic polyamide, polyethylene naphthalate (PEN) or the like is provided in the form of multifilaments in the core.

An advantageous combination of multifilaments and staple fiber yarn - in order to simultaneously ensure a long service life and particularly good grip properties of the rope element - can be achieved in a simple manner if staple fiber threads or yarns and multifilament threads or yarns, optionally in groups, are in the sheath , are arranged in succession in the circumferential direction.

On the other hand, however, it is also advantageously possible to provide a combination of multifilaments and staple fiber yarn in the sheath in that twisted yarns or yarns composed of staple fibers and multifilaments are arranged in the sheath.

In order to additionally increase the service life of the rope element, it is also advantageous if the multifilaments in the jacket and / or core are at least partially surface-treated. It is also favorable for this purpose if the rope element is at least partially surface-treated.

Tests have shown that the lifespan of the rope element can be increased in a simple manner if the multifilaments of the sheath or the rope element itself are or are impregnated, in particular with fatty acid esters, wax, polyurethanes, acrylates, silicones or the like.

Tests have also shown that the desired effect of a long service life and low elongation with improved grip properties is reliably ensured if the ratio of the titer of multifilaments to staple fibers in the jacket is at least 30:70, in particular between 50:50 and 97: 3 , For example, a ratio of 62:38 to 96: 4 can be provided.

The rope element according to the invention is particularly advantageously suitable for use with a twisted rope, in particular a twisted industrial rope. Rope elements according to the invention preferably form several strands of such a twisted rope. The rope can be designed as a twisted paper guide rope with particular advantage.

The invention is explained in more detail below on the basis of preferred exemplary embodiments illustrated in the drawing, to which, however, it is not intended to be limited. The drawing shows in detail:

Figure 1 shows schematically in cross section a twisted rope consisting of three rope elements in the form of strands with twisted multifilaments and staple fibers in the sheath.

2 shows a twisted rope consisting of three rope elements in the form of strands with staple fiber and multifilament yarns alternately arranged in pairs in the respective sheath; Fig. 3 is a twisted rope consisting of three strands, each composed of three rope elements.

In Fig. 1, a rope 1 is shown with three rope elements or strands 2, in each of which a core 3 is provided, which has threads 4 made of polyester multifilaments, whereby a very low (wet) elongation is achieved. However, similarly good elongation properties can also be achieved if the threads 4 are made of aromatic polyamide, e.g. Kevlar ®, or polyethylene naphthalate (PEN) are provided. However, the good elongation properties can not only be achieved through the choice of material, but also in particular through a known stretching process in the course of the rope production. The multifilaments provided in core 3 are, in particular, mere multifilaments which have no special twisted thread or no so-called twisted yarn.

In the sheath 5 of each rope element 2, threads 6 are provided, which consist of a polyamide staple fiber 7 and polyamide multifilaments 8 exist in combination. By combining polyamide multifilaments 8 and polyamide staple fibers 7 in the sheath 5 of the rope 1, the preferred properties, namely a particularly long service life and particularly good grip properties, are reliably guaranteed in combination.

These properties are also achieved in the rope 1 'shown in FIG. 2, which likewise consists of three rope elements or strands 2, the respective core 3 also having twists 4 made of polyester multifilaments. As an alternative to the above-mentioned exemplary embodiment, pairs of polyamide staple fiber yarns 9 and polyamide multifilament yarns 10 are alternately provided in the jacket 5. Here too, the desired properties with regard to service life, elongation and grip can be achieved in an advantageous manner in a controlled manner.

3 shows a rope 1 '"which consists of three strands 2'. The strands 2 'in turn each consist of three rope elements 11. The rope elements 11 here have a structure that that of the strands or rope elements described above 1, so that in order to avoid repetition reference can be made to the above statements. Of course, the strands 2 'according to FIG. 3 can also be constructed from rope elements 11, the structure of which strands 2 of the rope 1 " 2 corresponds to. The strands 2 'can have a braided or twisted structure, and they are twisted together to form the rope 1' '.

Experiments were carried out in order to demonstrate the good elongation properties and the long service life of the rope elements or ropes according to the invention and to prove the better grip properties compared to a rope in which only continuous fibers in the form of multifilaments are provided in the sheath.

The so-called “grip”, ie the “grip of the ropes according to the invention, and the wet and dry elongation were determined. In addition, the service life was measured by means of the running test described above. To measure the "grip", two ropes of the same type of manufacture are fastened at one point and held tightly next to one another. A sheet of paper is clamped in the gap formed between the two ropes and pulled out of this clamp, the load required for this being determined. The load (ie Force) required for pulling out corresponds to static friction; the load required for further pulling out corresponds to sliding friction.

To determine the rope elongation, the rope is attached at one point and two marking points are attached to the rope at a distance of one meter. The rope is then loaded with a predetermined weight of 80kg, and after one minute the distance between the markings is measured. The change in length that occurs is thus determined and calculated as a percentage of the marked initial length.

As can be seen from the following table, the ropes according to the invention according to the exemplary embodiments 1 to 5 have good grip properties, as are also given in the ropes known from the prior art as paper guide ropes. As can be seen in particular from the running test, however, the ropes according to the invention (exemplary embodiments 1 to 6) have a particularly long service life, and good elongation properties are also achieved, both in terms of dry elongation and wet elongation.

In the tests carried out as embodiment 6, a rope was also tested in which no staple fiber is provided in the sheath, whereby it can be seen from the table that this rope has very good elongation properties and a particularly long service life, but not the excellent grip properties of the others Ropes (Examples 1 to 5) has. However, a relatively small proportion of staple fiber would be sufficient to obtain the preferred grip properties.

This means that rope elements in particular, in which both staple fiber yarns and multifilaments are provided in the sheath, meet the requirements with regard to good elongation retention. ten, long service life and good grip correspond particularly well, but without deviating from the invention, only staple fiber yarns (for particularly good grip) or multifilaments (for a particularly long service life) can be provided in the sheath, but not so high Lifetime or not so good grip properties are acceptable.

Claims

Claims:

1. Rope element (2, 11) with a rotated or braided structure, with a core (3) and a jacket (5), the core (3) and the jacket (5) having different plastic materials, characterized in that in Sheath (5) of the multifilament rope element (8; 10) and / or staple fiber yarns (7/9) are provided.

2. Rope element according to claim 1, characterized in that in the sheath (5) multifilaments (8; 10) and / or staple fiber yarns (7; 9) made of polyamide are provided.

3. Rope element according to claim 1 or 2, characterized in that the sheath (5) has at least two different materials, the one material, which is optionally in the form of multifilaments (8; 10), has a longer service life than the other material , which may be in the form of staple fiber yarn (7; 9).

4. Rope element according to one of claims 1 to 3, characterized in that the core (3) has a material with an elongation at break ≤20%, in particular ≤15%.

5. Rope element according to one of claims 1 to 4, characterized in that in the core (3) a material with a wet elongation ≤105% of the dry elongation, preferably in the form of multifilaments, is provided.

6. Rope element according to one of claims 1 to 5, characterized in that in the core (3) polyester, aromatic polyamide, polyethylene naphthalate (PEN) or the like. in the form of multifilaments (8; 10) is provided.

7. Rope element according to one of claims 1 to 6, characterized in that in the sheath (5) staple fiber yarns or yarns (9) and multifilament yarns or yarns (10), optionally in groups, are arranged in succession in the circumferential direction ,

8. Rope element according to one of claims 1 to 6, characterized in that made of staple fibers (7) and multifilaments (8) combined threads or yarns (6) are arranged in the jacket (5).

9. Rope element according to one of claims 1 to 8, characterized in that the multifilaments (8; 10) in the jacket (5) and / or core (3) are at least partially surface-treated.

10. Rope element according to one of claims 1 to 9, characterized in that the rope element (2, 11) is at least partially surface-treated.

11. Rope element according to claim 9 or 10, characterized in that the multifilaments (8; 10) of the sheath (5) and / or the core (3) or the rope element (2) itself, in particular with fatty acid esters, wax, polyurethanes, Acrylates, silicones or the like are impregnated.

12. Rope element according to one of claims 1 to 11, characterized in that the ratio of the titer of multifilaments (8; 10) to staple fibers (7/9) in the sheath (5) is at least 30:70, in particular between 50:50 and 97 : 3, is.

13. Twisted rope (1, 1 ', l'') _r in particular industrial rope, for example paper guide rope, with at least one rope element (2/11) according to one of claims 1 to 10.

14. Rope according to claim 13, characterized in that the rope elements (2) form strands of the rope (1, 1 ').