EP0808943B1 - Cable for the driving and transport of a paper web during the manufacturing of paper or cardboard in a paper machine - Google Patents

Abstract

The invention relates to a rope for the taking along and transferring of paper webs in the manufacture on paper machines of paper and cardboard made from round-braided textile fiber material. In accordance with the invention, raised positions are distributed over the circumference of the rope at regular or irregular distances. The raised positions are generated by design measures such as the selection of a different multiple thread count in the different running directions and/or the use of twisted and laid fiber elements, and/or by the use of fibers with profiled fiber cross-sections and/or textured or crimped fiber yarns and or by the use of fibers with profiled fiber crosssections and/or textured or crimped fiber yarns.

Description

The invention relates to a rope for taking along and passing on of paper webs in the manufacture of paper and cardboard on paper machines made of round braided textile fiber material.

Ropes made of braided textile fiber material come in a wide variety Configurations known. So from DE 40 35 814 A1, for example, a rope is known which consists of a core and a braided sheath in particular, the core is stretched, i.e. a low elongation behavior and has a high modulus of elasticity. Aim of this booth technology is the reduction of the relative movement between a core and a jacket surrounding this, in particular when clamping the rope to the sheath. The core as well as the coat are made from a multitude of thin polyamide fibers, which too different assemblies of the fiber rope are summarized. The coat is made from a blend of low stretch and normal stretching fibers. The number of low stretch fibers is in particular 17% to 25%. This will make the stretch behavior of the cladding reduced so that it corresponds to that of the core, which causes a relative movement through different stretching is prevented. At the same time, however, the coefficient of friction the core and the cladding approximated. The fibers can also consist of polyethylene or polypropylene.

DE 25 05 568 A1 describes the creation of cable structures known as reinforcement for solid, elastic or light deformable materials (e.g. cord for car tires) and which have increased resistance to fatigue and / or wear exhibit. The basic idea here is to reduce the radial pressures or pressures which exist between the mounting positions of a cable and between them and the soul. The Components of the cable, i.e. the soul and at least one outside location are designed so that at least two consecutive Components that touch each other radially, made of materials are formed with different moduli of elasticity. This means since one component is "softer", contact surfaces between two components enlarged and the surface pressure reduced.

The AT 367 112 B relates to increasing the life of a Rope made of aromatic polyamide with several layers of over a core made of rope elements. The rope is there from a heart braid, from one, with a twist around the heart braid beaten, made up of inner strand layer, one the outer strand layer bordering the inner strand layer, which also consists of strands, one parallel to the twist the strands of the inner strand layer have a twist, and monofilament bundles arranged between the inner and outer strand layer. The cardiac cord and the strands of the inner and outer Stranded layers are composed of monofilament bundles. Thereby the surface pressure on the guide lines is reduced, what increases the lifespan.

US 4,563,869 relates to a linen plant, in particular a Heavy duty marine rope, with security features to keep people in front Preserve damage from broken rope. If all components If one rope breaks at the same time, the two separate ones fly Rope pieces away from the tear point at tremendous speed, causing the people in this area are in great danger are exposed. Here it is proposed a multi-component rope, preferably made of synthetic material, which consists of a certain number of components with great elongation behavior and a certain number of components with relatively little Strain behavior exists, the amount of the latter components predominates to manufacture. According to further training this idea has a plurality of the outer strands of the rope of cover threads, which are made of a material with higher Abrasion resistance are formed.

Finally, DE 35 13 093 A1 describes a method of manufacture a slope cable as a drive element for motor vehicle sunroofs known which is sound absorbing and abrasion resistant should be. With a device for performing the method becomes a gradient cable with a flocked thread covered. For this purpose, a coil rotates the thread-receiving plate around the central axis of the gradient cable.

• möglichst lange Lebensdauer bei Laufgeschwindigkeiten von bis zu 2.500 m/min;
• geringe Betriebsdehnung der Seile, so daß die limitierten Spannwege der Seilspannstationen ausreichen, ohne daß die erforderliche Seilspannung unterschritten wird;
• Temperatur-, Feuchtigkeits- und Chemikalienbeständigkeit bei in der Papier- oder Kartonagenherstellung üblichen Bedingungen;
• gute Scheuer- bzw. Abriebbeständigkeit gegenüber den Laufrollen der Seiführungssysteme und
• gute Spleißbarkeit der Seilenden, um zu einem endlosen Seil zu gelangen.

In addition to the application in the different areas described above, it is known to use so-called paper guide ropes for the entrainment and transfer of paper webs in the production of paper and cardboard on paper machines. These ropes usually run in rope guide systems on one of the two long sides of a paper machine. The main task of such ropes is to clamp the paper web formed by means of suitable rope routing and properties, and thus to transport it again through the individual sections of the paper machine when starting up or being torn off. The so-called paper guide ropes must meet special requirements, which can be summarized as follows:

• longest possible lifespan at running speeds of up to 2,500 m / min;
• low operating elongation of the ropes, so that the limited tensioning paths of the rope tensioning stations are sufficient without falling below the required rope tension;
• Resistance to temperature, moisture and chemicals under conditions customary in the manufacture of paper or cardboard;
• good abrasion and abrasion resistance compared to the rollers of the soap guiding systems and
• good spliceability of the rope ends to get an endless rope.

In addition to these special requirements, in all cases it is the Application of the so-called paper guide rope crucial that the paper or cardboard web when starting the paper manufacturing process easily clamped and from a section of the paper machine until the next section. According to experience follow one another up to 10 sections, with the number of sections on the type of paper machine and depends on the quality of the paper or cardboard. The usual Rope lengths per section vary between 30 m and 700 m, the paper guide ropes in different designs Rope guidance systems (e.g. one-rope, two-rope and three-rope systems) be applied.

Basically, the so-called paper guide ropes consist of textile fiber material, both fibers on cellulosic Basis as well as fibers from organic chain polymers, such as polyacrylic, Polyamide, polyester, polypropylene, polyethylene, polyvinyl alcohol and the like are used. The as paper guide ropes Ropes used consist of ropes on the one hand twisted or beaten strands and on the other hand braided Ropes. The braided ropes can be used as braided hollow ropes or in the form of ropes in the core / jacket construction be applied.

Worldwide, the braided paper guide ropes have resulted their long service life, the low operational expansion, the excellent Scrub and abrasion resistance and the simple Splicability prevailed over twisted ropes. There are however, in some cases, structural conditions on paper machines in which twisted ropes are preferred is given because of the coarser textured surface The twisted ropes have advantages over paper web clamping the comparatively smoother structure of braided ropes occur.

The object of the invention is the above-mentioned advantages braided Ropes, such as long service life, low operational elongation, good spliceability and high abrasion protection with the advantage of to connect roughly structured surface with twisted ropes, in order to achieve an even better paper web clamping.

According to the invention, this task is based on a generic Rope according to the preamble of claim 1 by the characterizing features of claim 1 solved. According to the invention accordingly, raised points on the rope surface in the train of the braiding process or two types of fibers are targeted used with different properties. Particularly advantageous become the two measures that solve the task for themselves combined.

With the present invention, a rope is provided, on the one hand, low rope elongation by maintaining it of round braiding technology and on the other hand a significantly improved one Grip combined.

The inventive generation of the raised spots in the rope network round braided ropes are advantageously carried out over the entire length Rope circumference at regular or irregular intervals of 0.1 to 10 cm, preferably 1 to 5 cm. The raised places are set, for example, by setting the Braiding machine parameters, such as filling the braiding machine, Choice of stroke length etc. generated.

Multifilament yarns or are preferably used for the braiding process Staple fiber yarns used, with single fiber titer from 1.6 to 30 dtex, preferably 6 to 25 dtex, and yarn count from 200 to 17,000 dtex, preferably 700 to 10,000 dtex, are used. These yarns are advantageously either individually or folded or rotated or used in combinations thereof. The yarns mentioned can be provided with a protective twist or turned and with different impregnations, for example hydrophobic finishes, abrasion protection, color pigment finishes etc., be equipped.

Fibers based on cellulose, for example, are suitable as fiber materials Cotton, hemp, regenerated cellulose fiber and similar usable. However, fibers based on synthetic, thread-forming chain molecules are used, such as for example polyacrylnytril, polyamide, polyester, polyvinyl alcohol, Polypropylene, polyethylene and the like. Due to the good textile mechanical data, as well as sufficient chemicals and Temperature resistance in the paper machine environment are preferred Fibers based on polyamide, polyacrylic, polyester or used on a cellulose basis.

The above task is also accomplished by using two Fiber types or fiber yarns solved in the rope, this solution either alone or in combination with those described above Features of the braided rope with raised spots application place. The generation of the aforementioned, design-related, Raised spots can also be used through targeted use of fibers with a profiled fiber cross section and / or insert of textured or crimped multifilament yarns and / or Staple fiber yarns in addition to the normally used smooth ones Multifilament yarns can be achieved. Both the use of profiled Fibers as well as yarns with crimp or texturing leads to increased bulk volume with the same fiber titer as with smooth yarns and thus to form the desired ones raised places. The fibers or yarns must, however be used in such a way that predominantly in the raised areas the profiled fibers or crimped multifilament yarns come to rest. Otherwise apply to the other Properties such as fiber and yarn titer, shedding, twisting, impregnation and selection of chain polymers the previous versions.

Regarding the profiling of the fiber cross-section come in particular synthetic fibers used in fiber production a geometrically defined through special execution of the nozzle holes Cross-sectional shape, such as Y, was given, special meaning too. With regard to the texturing or Crimping of multifilament yarns are all common today Process in question, as long as only an increase in yarn volume is effected.

Fig. 1:

eine schematische seitliche Darstellung eines Teils einer Papiermaschine, in welcher das erfindungsgemäße Seil einsetzbar ist,

Fig. 2:

eine erste Ausführungsform eines erfindungsgemäßen Seiles,

Fig. 3:

eine zweite Ausführungsform eines erfindungsgemäßen Seiles,

Fig. 4:

eine dritte Ausführungsform eines erfindungsgemäßen Seiles,

Fig. 5:

eine vierte Ausführungsform eines erfindungsgemäßen Seiles,

Fig. 6:

ein rundgeflochtenes Seil nach dem Stand der Technik und

Fig. 7:

ein gedrehtes Seil nach dem Stand der Technik.

Further details and advantages of the invention result from the embodiments of the present invention shown in the drawing. Show it:

Fig. 1:

2 shows a schematic lateral representation of part of a paper machine in which the rope according to the invention can be used,

Fig. 2:

a first embodiment of a rope according to the invention,

Fig. 3:

a second embodiment of a rope according to the invention,

Fig. 4:

a third embodiment of a rope according to the invention,

Fig. 5:

a fourth embodiment of a rope according to the invention,

Fig. 6:

a round braided rope according to the state of the art and

Fig. 7:

a twisted rope according to the prior art.

1 shows a paper machine in which 14 shown drying cylinder in the embodiment shown here over which the paper webs are guided. At 12 is a felt running over the drying cylinder (dashed Line). In a solid line, the rope 10 is Paper guide shown. This is done using jigs 16 stretched to the desired extent.

2 is a first embodiment of the present invention shown. The threading in the direction 18 is chosen higher (16 threads) than in the opposite direction 20 (8 threads). In the example shown here, multifilament yarns are made from polyamide (PA 6) used, the base yarns used have the same titer. They have a hydrophobic finish and show a rotation of 140 T / m. Because of the different threads raised areas are formed at a distance of 1.8 cm, whereby here from the middle of the raised area to the middle of the next raised point was measured. In the present one An embodiment is a hollow braid (example 1).

3 is a further embodiment of the invention in Shown a round braided rope 10, the thread in the running direction 18 is higher (14 threads) than in the opposite Running direction 20 (8-ply). In the embodiment shown 20 multifilament yarns are made for the running directions Polyamide (PA 66) used and for the opposite direction 18 staple fiber yarns made of polyacrylonitrile with the same yarn count. The polyamide multifilament yarns are finished and hydrophobic the polyacrylonitrile staple fiber yarns are not used for advanced use. There is also a core-sheath construction of the rope 10 selected, with a core 22 made of beaten polyamide yarns (PA 66) exists. Due to the different threading are sublime Place at a distance of 1.8 cm (measured from the center a survey to the middle of the next survey) (Example 2).

4 is a third embodiment of the invention in shape of a round braided rope 10, the raised Places 24 consist of cotton yarn with a basic titer of 9,000 dtex, which are beaten into strands of 13,500 tex. The others Parts 26 are made of smooth multifilament yarns with basic titer 9,000 dtex with 8 strands. Both types of yarn are included abrasion protection equipment including a color pigment component Mistake. The round braid is designed as a hollow rope construction. The raised places are at intervals of 1.8 cm to each other (measured from the center of an elevation to the center the following survey) (Example 3).

Another embodiment of the invention can be repeated 3 are explained, with this Embodiment the raised points in the direction 18 of crimped multifilament yarns are formed in which the Individual fibers are profiled in a Y-shape. The yarn titer is 4,500 dtex / 16 threads. In the opposite direction 20 are smooth multifilament yarns used with the same yarn titer and the same thread. The braid is a core-shell construction, the Jacket made of polyamide 6 and the beaten core 22 made of polyester fibers consists. The raised areas are at intervals of 1.8 cm (measured from the center of an elevation to the center of the next survey) to each other (Example 4).

5 is a further exemplary embodiment of the invention round braided rope shown with raised spots, these raised areas made of textured multifilament yarns (28) with basic titer 4,500 dtex are formed, which lead to strands of 6,750 tex were beaten. The parts 30 and 32 consist of multifilament yarns with a basic titer of 4,500 dtex and 16 threads. The sublime Places are spaced 3.5 cm apart (measured from the middle of one elevation to the middle of the next Survey). The round braid is designed as a hollow rope (Example 5).

The diameters of the aforementioned ropes are usually 5 up to 20 mm, preferably between 8 and 15 mm.

6 and 7 are paper guide ropes according to the prior art Technique shown, wherein in Fig. 6 is made of polyamide round braided rope (example 6) and in Fig. 7 a polyamide existing tied rope (example 7) shown are.

To the improved properties of the manufactured according to the invention Ropes compared to conventional paper guide ropes, as shown in FIGS. 6 and 7 as Examples 6 and 7 comparative tests were carried out. To the one was the so-called "grip", i.e. the "grip" of the Ropes according to the invention determined. The second was rope stretching measured.

To measure the "grip", two ropes of the same type of manufacture are used attached at one point and held tightly side by side. In the gap formed between the two ropes there is a sheet of paper pinched and at one end with a spring balance pulled through the gap at a constant speed. The required force can be read off in grams and adjusts Measure for the "grip". In the comparative investigations carried out here were all examples under the same experimental conditions examined. The value for Example 6, i.e. the round braided rope according to the state of the art was 100% equated. The remaining values are on this value retrospectively.

The rope was attached at one point to determine the rope elongation and there were two marking points in one on the rope Installed a distance of one meter. The rope comes with a given Weight of 80 kg is loaded and after a minute the distance between the markings measured and the one that occurred Change in length becomes a percentage of the unloaded initial length determined and calculated.

The following table shows the values recorded for the different examples 1-7 (in which ropes with an outer diameter of 12 mm were chosen): example "Grip" rope elongation 1 170% 1.6% 2 230% 3.1% 3 210% 2.8% 4 190% 2.4% 5 220% 2.5% 6 (reference braided) 100% 1.5% 7 (reference rotated) 150% 5.6%

Examples 1-5 show that due to the measures according to the invention the grip compared to conventional round braided ropes (cf. Example 6) is significantly improved. The grip is even opposite the twisted reference rope (example 7) significantly improved. Despite this improvement in grip is in all of the invention Examples 1-5 do not significantly affect rope elongation that of the round braided reference rope deteriorated. In any case, it is much better than the rope elongation of the rotated reference rope.

Claims (10)

1. A rope (10) for the driving and passing on of paper webs in the manufacture of paper and cardboard on paper machines from round-braided textile fibre material, with raised points (24) being formed at regular or irregular intervals around the rope periphery on the basis of one or more of the following features:

   a) different multi-ply of the fibre and/or yarn elements in the different machine directions (18, 20);

   b) different constructional design due to the use of turned fibre elements;

   c) different fibre kinds in the different machine directions (18, 20), with fibre kinds having profiled fibre cross-sections, textured and/or crimped multi-filament yarns and/or textured or crimped staple fibre yarns being directly used in addition to the conventionally used smooth yearns to form raised points such that mainly the profiled fibres or the crimped multi-filament yarns come to rest at the raised points.
2. A rope in accordance with claim 1, characterised in that the intervals between the raised points are between 0.1 to 10 cm, preferably 1 to 5 cm.
3. A rope in accordance with either of claims 1 or 2, characterised in that the rope is braided from two fibre elements and/or yarn elements.
4. A rope in accordance with any of claims 1-3, characterised in that the rope consists of multi-filament yarns or staple fibre yarns whose individual fibre count is 1.7 to 30 dtex, preferably 6 to 25 dtex, and whose yarn count is 200 dtex to 17,000 dtex, preferably 700 dtex to 10,000 dtex.
5. A rope in accordance with claim 4, characterised in that the yarns are single, plied and/or turned.
6. A rope in accordance with claim 5, characterised in that the yarns are made in part of needle-braided units.
7. A rope in accordance with either of claims 4 or 5, characterised in that the yearns are provided with a protective twist or are turned and/or impregnated.
8. A rope in accordance with any of claims 1 to 7, characterised in that the textile fibre material consists of fibres on a cellulose basis.
9. A rope in accordance with any of claims 1-5, characterised in that the textile fibre material consists of fibres on the basis of synthetic, thread-forming chain molecules.
10. A rope in accordance with claim 9, characterised in that the textile fibre material consists of fibres on the basis of polyamide, polyacrylate or polyester.

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