DD296513A5 - NAUTHARN AND METHOD FOR THE PRODUCTION OF SEEDING YARN - Google Patents

Abstract

The invention relates to a Naehgarn provided with a structuring on the surface, the Naehgarn of spun together, twisted and / or entangled fibers, filaments and / or yarns and a method for producing a Naehgarns. According to the invention, the structuring is designed as a microstructure and comprises punctiform, linear and / or planar depressions and / or punctiform, linear and / or planar elevations, these microstructures extending over the entire surface of the fibers, filaments and / or yarns forming the sewing yarn or on the outwardly facing surface of the Naehgarnes is provided. In the process, the fibers, filaments and / or yarns are spun, twisted and / or swirled together, and the fibers are dyed, dried, fixed, and / or rewound, and the natural yarn thus produced is subsequently rewound. Before spinning, twisting and / or vortexing the fiber, filaments and / or yarns, they are subjected to a low-temperature plasma treatment or a corona treatment. It is also possible that the finished Naehgarn before the corona or low-temperature plasma treatment wound on a winding body and the winding body during the corona or low-temperature plasma treatment is pervaded with a gas. {Naeh yarn; Microstructure; punctual, line-shaped, flat depressions; increases; fibers; filaments; yarns; Corona plasma treatment; Low-temperature plasma treatment; Wickelkoerper}

Description

For this 1 page drawings

Field of application of the invention

The invention relates to a sewing thread with a structuring provided on the surface, wherein the sewing thread of spun together, twisted and / or entangled fibers, filaments and / or yarns and a method for producing a sewing thread.

Characteristic of the known state of the art

It has long been known to produce sewing yarns by a secondary spinning process of fibers and / or filaments, by twisting fiber yarns and / or multifilament yarns, or by intermingling fiber yarns and / or multifilament yarns.

For example, DE-PS 37 20237 or European Patent Application 88109358.7, which is assigned to the assignee of the present patent application, each describe a process for producing a sewing yarn in which the sewing yarn comprises a multifilament core material and a multifilament sheath material, wherein the core material is used to produce the sewing yarn is swirled together with the jacket material under the influence of a fluid flow.

In the above-described methods for producing a sewing yarn, fibers or filaments having a round cross section are usually used. The same applies here to the production of sewing threads used yarns, these yarns are composed of fibers or filaments with a round cross-section.

In addition, however, it is known to use profiled fibers or filaments or yarns, which consist of profiled fibers or profiled filaments, for the production of sewing thread. In this case, this profiling, which is expressed, for example, in a polygonal, T-shaped or Y-shaped cross-section, is produced by selecting a corresponding nozzle during primary spinning, whereby such a macrostructure arises exclusively in the longitudinal direction of the fibers or of the filament and the yarn produced therefrom extends.

Object of the invention

The object of the invention is to increase the productivity in industrial sewing.

Explanation of the essence of the invention

The invention has for its object to provide a sewing yarn of spun together, twisted and / or entangled fibers, filaments and / or yarns provided with a surface structuring and a method for producing sewing yarn, which ensure particularly good sewing properties.

According to the invention the object is achieved in that the structuring is designed as a microstructure and punctiform, linear and / or planar depressions and / or punctiform, linear and / or planar elevations and that the microstructure over the entire surface of the threads forming the sewing thread, Filaments and / or yarns extending or provided on the outwardly facing surface of the sewing thread. The process is characterized by subjecting the fibers, filaments and / or yarns to low-temperature plasma treatment or corona treatment prior to spinning, twisting and / or vortexing. It is also possible that the sewing yarn is wound onto a winding body before the corona or low-temperature plasma treatment and that a gas flows through the winding body during the corona or low-temperature plasma treatment. It is therefore claimed a sewing thread, which is provided on its surface with a structuring. Here, the sewing thread consists of spun together, twisted and / or entangled fibers, filaments and / or yarns, wherein the structuring is designed as a microstructure and punctiform, linear and / or planar depressions and / or punctiform, linear and / or planar increases. Depending on the particular manufacturing process, the microstructure in the sewing yarn of the invention extends either over the outwardly facing surface of the sewing yarn or over the entire surface of the fibers, filaments and / or yarns forming the sewing yarn, so that all seen therein over the cross section of the finished sewing yarn processed fibers, filaments and / or yarns on their surfaces

have the aforementioned microstructuring or roughening. The latter is true even if the sewing thread according to the invention, for example by subsequent twisting, a very compact construction, i. a very high thread closure, has.

The sewing thread according to the invention has a number of advantages. Thus, for example, it was found in sewing trials that the sewing thread according to the invention in comparison to an otherwise identical sewing thread, i. a sewing thread whose surface is not microstructured or roughened in the above-mentioned manner behaves much better, d. H. Especially in industrial sewing tests showed significantly fewer thread breaks, as described below in the embodiments.

Such an improvement of the sewing properties is astonishing, especially since sewing threads are particularly endeavored to make the surface of the sewing yarns as smooth as possible, for example by applying a preparation, so as to minimize the friction occurring during sewing between the yarn and the thread-guiding machine parts (e.g. Thread brake, tension regulator, needle).

As a reason for the above-described improved sewing performance of the sewing yarn according to the invention, it is assumed that due to the microstructuring or roughening of the surfaces of the sewing yarn forming fibers, filaments and / or yarns the thread closure of the sewing yarn is improved so that in the sewing thread according to the invention suspensions of individual fibers or filaments, which are to be regarded as a precursor of a thread break, can not occur. This assumption is supported by the fact that the sewing yarn according to the invention can be processed in the unvarnished state compared to a corresponding conventional sewing thread, which does not have the microstructuring, under Konfektionsbedingungen, which is not the case with the non-vulvised, conventional sewing thread. In addition, the sewing thread according to the invention seems to absorb the applied thereto avivage much better and more uniform compared to a corresponding conventional sewing thread, which is to be regarded as a further cause for the improved sewing behavior of the sewing thread according to the invention.

Preferably, in the case of the sewing thread according to the invention, the microstructuring consists of circle-like and / or circular depressions and / or elevations, wherein the term circular-like also means angular shapes whose shape approximates a circle.

With regard to the dimensions of the depressions or elevations in the case of the sewing thread according to the invention, it should be noted that the depressions have a depth or the elevations have a height of between approximately 0.01 μm and 0.3 μm, preferably between 0.18 μm and 0.25 μm. In other words, this means that a particularly suitable embodiment of the sewing yarn according to the invention have the previously described microstructuring or roughening only in a relatively thin surface layer, so that does not impair the strength of the fiber, the filament or the yarn through these depressions or elevations becomes.

The width of the punctiform, linear or planar depressions or punctiform, linear or planar elevations varies in the case of the sewing thread according to the invention between 0.1 μm and 4 μm, preferably between 0.1 μm and 2 μm. The axial and radial distances of adjacent punctiform, linear or area depressions or of adjacent punctiform, linear or areal elevations are 0.01 μm and 2 μm, preferably 1.2 μm and 2 μm.

Previously, preferred ranges are indicated for the heights, depths, widths, and distances of the pits or elevations. It will be understood that within these values of Gaussian distribution, only about 60 to about 80% of the depressions or elevations are present, while the corresponding values of the remaining 40 to 20% of the depressions are below or above the preferred values ,

The invention is further based on the object of providing a method of the type indicated by which the sewing threads described above can be produced in a particularly reproducible manner.

This object is achieved by a first method with the characterizing feature of claim 6 and by a second method with the characterizing features of claim 8. According to the invention, a first method is thus claimed in which the fibers, filaments and / or yarns are spun, twisted and / or intermingled and subsequently the sewing yarn thus produced is optionally dyed, dried, fixed, finished and / or rewound for the production of the sewing yarn , Here, in the process according to the invention before spinning, twisting and / or swirling, the fibers, filaments and / or yarns used as starting material for producing the sewing yarn are subjected to low-temperature plasma treatment or corona treatment. In other words, in the first method according to the invention, the starting materials are first subjected to the low-temperature plasma treatment or corona treatment and then the sewing yarn is produced by the known measures described above from the starting materials thus treated.

The further proposed according to the invention second method according to claim 8 for the preparation of provided on its outwardly facing surface with the microstructure sewing yarn provides that subjecting the sewing thread of a corona or low-temperature plasma treatment, wherein previously wound the thread on a winding body Has. During the corona or low-temperature plasma treatment, the wound body is then flowed through with a corresponding gas. The sewing yarn thus produced, like the previously described sewing yarn treated according to the first method, has the microstructuring described above, but this microstructuring is limited to the outwardly facing surface of the sewing yarn.

Surprisingly, it could be found in the application of the method according to the invention that the roughening or microstructuring produced by the low-temperature plasma treatment or corona treatment of the surface of the thus treated starting materials, d. H. the Nähgarnes or the fibers, filaments and / or yarns, in which subsequent subsequent processing methods, such as spinning, twisting, Verwirbelungs-, Avivier-, rewinding and / or dyeing methods have not been eliminated, although these microstructures or roughening of the surface extend only over a relatively small layer thickness of the surface of the treated materials, as described above for the sewing yarn according to the invention. This is surprising in particular for the reason that it is known in the case of plastic parts that further microstructuring, which is limited to a relatively small layer thickness, is eliminated by further processing of the plastic parts. However, in the method according to the invention, this does not apply to the surface of the fibers, filaments or yarns.

The erfmdungsgemaßen method have a number of advantages So they can be particularly easy durchfuhren, since this no special Ausgangsmatenalien are required Rather, the Ausgangsmatenal is used as Ausgangsmatenal, which is used anyway for the production of a conventional Nahgarnes, this Ausgangsmatenal, as above described several times, either before spinning, twisting and / or swirling or as already finished Nahgarn a corona or low-temperature plasma treatment is subjected also was found that the treated as a fiber, filaments and / or yarn Ausgangsmatenalien better spin, can twist or swirl, since, as already described above, the thread closure between the yarn components forming the Nahgarn is improved by the low-temperature plasma treatment or corona treatment

A particularly suitable embodiment of the inventive method provides that before the low-temperature plasma treatment or corona treatment of the fibers, filaments and / or yarns produces a heap and that the heap during the low-temperature plasma treatment or corona Treatment with a gas flows through Such a procedure has the advantage that it is on the one hand very easy to carry out, since this no large-scale facilities are required In addition, it was found that between the inner layers, the middle layers and the outer layers of the heap no Differences in relation to roughening or property changes caused by the low-temperature plasma treatment or corona treatment, for example, could be determined by color tests and subsequent colorimetric analysis of samples taken from the lower, middle and upper layer of the aggregate Also Nahgarne, which were prepared from corresponding samples (bottom layer, middle layer and top layer of the heap), shows the same close behavior both in terms of the number of approaching here Buttonhole as well as the seam length

In particular, it could be found, however, that a Nahgarn, which was prepared by the erfmdungsgemaßen method described above, compared to a conventionally produced but otherwise identical Nahgarn preferably nearing seams and the proximity of Knopflochern showed significantly less yarn breaks, so that with the erfmdungsgemaß An approximately 10 to about 20 times longer seam or about 10 to about 30 times the number of buttonholes produced could also be produced with comparative tension measurements on yarns inserted into a sewing machine, in which the yarn brake of the sewing machine was set according to the respective near task the superior yarn tension varies between about ± 2% and about ± 8% of the average yarn tension value, whereas in the case of the conventionally produced comparative yarn the deviations vary from the mean value between about ± 15% and ± 25% If the starting material used for the production of Nahgarnes (fibers, filaments and / or yarns) or the finished Nahgarn subjected to a low-temperature plasma treatment in the erfmdungsgemaßen process, one works at a pressure (vacuum) between about 5Pa and 500Pa Particularly good results are obtained when the low-temperature plasma treatment at a vacuum between 50Pa and 300Pa, preferably between 70Pa and 200Pa, ausfuhrt

A further embodiment of the inventive method provides that in the low-temperature plasma treatment during a first treatment period, a vacuum between about 5 Pa and about 120 Pa, preferably between about 20Pa and 120Pa, and during a subsequent second treatment pen a vacuum between about 80 Pa and 250 Pa, preferably between about 100 Pa and about 200 Pa. As a result, it is achieved that the bulk material or the winding body flows through the gas particularly well, which ensures the uniformity of the treatment, in particular in the cases in which If the first treatment penis directly adjoins the second treatment pen, and above all if the first and second treatment pen are repeated several times in succession, the heap or bobbin is flowed through particularly well, so that unevennesses in the thickness of the heap or the Wickelk In the above procedure, where two consecutive treatment periods are performed at a different vacuum, the transition from the first treatment pen to the second treatment pen and from the second treatment pen to the first treatment pen can be made by controlling the vacuum in each However, a special gentle treatment of the heap or wound body allows an embodiment of the inventive method in which the vacuum in the first treatment period is continuously transferred to the vacuum of the second treatment pen and the vacuum in the second treatment pen, so that the pressure during the Total treatment ζ Β increases or decreases sinusoidally

Particularly good and uniform results are obtained in the erfmdungsgemaßen process, if the residence time of the first and second treatment pen each between 10 seconds and 160 seconds, preferably between 20 seconds and 60 seconds varies

In order to prevent unwanted side effects caused by foreign gases in the low-temperature plasma treatment according to the inventive method, it is' recommended to set a vacuum at the beginning of the low-temperature plasma treatment at a pressure which is less than the pressure at the Low-temperature plasma treatment Subsequently, the gas that flows through the debris is passed until the

Previously, the parameters are listed, which are to be applied when a low-temperature plasma treatment is carried out in the inventive method.

If it is desired to carry out a corona treatment in the process according to the invention, this corona treatment is carried out at a pressure which is at and / or slightly above and / or slightly below the normal pressure. Thus, in the methods of the invention, the corona treatment is carried out at a pressure of between 86.659χ10 ³ Pa and 133.32χ10 ³ Pa, preferably at a pressure between 93.325 x 10 ³ Pa and 113.324 x 10 ³ Pa. Particularly good results in terms of the sewing properties of the sewing yarn thus prepared can be achieved in a corona treatment, during which a pressure between 86.659 x 10 ³ Pa and 99.99 x 10 ³ Pa and during a second treatment period a pressure between 99 , 99 x 10 ³ Pa and 113.324 χ 10 ³ Pa. This is obviously due to the fact that the heap or the winding body is flowed through particularly well and evenly by the pressure change, so that the electrons, ions, highly reactive molecules and / or radicals generated in the corona treatment corresponding roughen the surface of the material and optionally crosslink , oxidize and / or etch. Preferably, the first treatment period immediately follows the second treatment period, it being advisable to repeat this treatment cycle, consisting of the first and second treatment period, several times alternately.

As already described above in the case of the low-temperature plasma treatment, the pressure change between the first and second treatment period can be carried out abruptly. In this case, however, there could be the risk that, in the event of an abrupt pressure change, the heap or the winding body undesirably shifts so that, in particular in the case of relatively softly packed heaps, i. such heaps, where the Shore hardness is low, a continuous pressure increase is carried out at the transition from the first treatment period to the second treatment period, or a continuous pressure reduction during the transition from the second treatment period to the first treatment period. This pressure increase or decrease in pressure can then be carried out preferably sinusoidally, wherein for the first period and the second period respectively treatment times between 10 seconds and 160 seconds, preferably between 20 seconds and 60 seconds are selected.

In order to eliminate unwanted foreign gases during corona treatment, such as water vapor originating from atmospheric moisture, or dust particles, which can lead to an uncontrolled, non-reproducible corona discharge, it is advisable to set a pressure before starting the corona treatment is lower than the pressure during the corona treatment and then adjust the required treatment pressure by supplying a defined amount of gas. Here, preferably, the autoclave used for the corona treatment is evacuated to a pressure between 1000 Pa and 10000 Pa, so that subsequently the respective gas flowing through the heap or the winding body can be supplied to the pressure in the autoclave to a value between 86.659 ³ 10 ³ Pa and 113.324 χ 10 ³ Pa.

Of course, you can also carry out the corona treatment at atmospheric pressure, in which case only has to ensure that the gas used in the corona treatment flows through the debris or the bobbin. Previously, in the method according to the invention both in the low-temperature plasma treatment and in the corona treatment of a gas has been mentioned, which flows through the heap or the bobbin. This is, in particular, a reactive gas, ie a gas which forms ions, highly reactive molecules and / or radicals under the influence of the aforementioned two gas discharges and optionally emits electrons in order to achieve the desired roughening and optionally crosslinking, oxidation and / or or etching the surface of the fibers, filaments and / or yarns. Particularly good results are achieved in the inventive method, ie both in the corona and in the low-temperature plasma treatment, if as a reactive gas O ₂ , N ₂ O, O ₃ , CO ₂ , NH ₃ , SO ₂ , SiCl ₄ , CCI ₄ , CF ₆ , Cl CF ₄ , SF ₆ , CO and / or H ₂ , both as individual gases and as gas mixtures, since these gases easily under the influence of the high-frequency electric field, the aforementioned ions, highly reactive molecules, radicals or Make electrons.

A further embodiment of the inventive method provides that instead of the aforementioned highly reactive gases as the gas, an inert gas, preferably a noble gas, a mixture of noble gases and / or nitrogen, is used. This ensures that the risk of a chemical change of the materials thus treated is reduced. However, if a chemical change of the substrate of the corona or low-temperature plasma treatment material is desired, so you can use the aforementioned reactive gases in the corona or low-temperature plasma treatment. If, for example, fibers, filaments, yarns or finished sewing threads of polyethylene terephthalate flow through during the low-temperature plasma treatment or during the corona treatment with basic, reactive gases, this has the result that a material treated in this way can subsequently be dyed after treatment with acid dyes. Likewise, it is possible to flow through the aforementioned substrates during the corona or low-temperature plasma treatment with an acid, reactive gas, whereby these so treated substrates are then dyeable with basic dyes. Of course, in the above-described procedure, it is also possible to use a mixture of acidic or basic gases instead of the one basic or one acidic gas. The substrates thus treated and subsequently dyed have, surprisingly, high color fastness, the subsequent dyeing being considerably facilitated by the treatment in comparison to conventional dyeing with disperse dyestuffs, which is expressed in correspondingly reduced dyeing temperatures and considerably shortened dyeing times. It was also found that ionic preparations had a significantly better adhesion to the above chemically modified substrates, which was expressed in particular by a much better sewing behavior of the sewing yarns produced therefrom.

The total treatment time in the methods according to the invention depends on the desired effects and the set power densities between about 2 minutes and about 30 minutes, preferably between 5 minutes and about 20 minutes.

Particularly good results are achieved in the inventive method, if the wound fibers, filaments and / or yarns or the finished sewing thread to be treated on a winding body, in particular on a perforated sleeve and preferably on a perforated metal sleeve.

For a particularly uniform treatment effect, d. H. To ensure a particularly uniform roughening or microstructuring of the treated surfaces, and thus also particularly uniform properties over

To achieve the thickness of the heap or the bobbin, it is recommended, especially in very densely packed heaps or bobbins, alternately flow through the heap or the bobbin from outside to inside and from the inside out. If the method according to the invention according to the previously described embodiment is used, in which a first treatment period with reduced pressure is performed before a second treatment period with a correspondingly increased pressure, it is recommended that during the first treatment period, the debris or the wound body from the inside outside and during the second treatment period to flow through the heap or the bobbin from outside to inside or vice versa.

Particularly good results with respect to the sewing properties of the sewing yarns produced by the process according to the invention are achieved by carrying out the low-temperature plasma treatment or corona treatment on fibers, filaments or yarns provided with a preparation or finish. It can be assumed here that the softening or preparation reacts to form a chemical compound with the surface of the respectively treated material by the low-temperature plasma treatment or corona treatment and / or in the case of the low-temperature plasma treatment or corona treatment, a particularly uniform Distribution of the finishing or preparation over the thickness of the heap or the winding body is carried out, so that the further improvements of the proximity properties is explained. If in the above explanations there is talk of heaps, then this includes any ordered uniformly flowing goods presentation, such as, for example, in the case of fibers (flake) a fiber cake or a card sliver, which is wound up accordingly, or in the case of filaments or yarns a corresponding winding body or a muff, to understand.

embodiments

The erfidungsgemäßen methods are described below with reference to five exemplary embodiments.

example 1

Polyester fibers with a staple length of 38 mm and a single fiber thickness of 1.3 dtex were packed into a product carrier commonly used for the dyeing of flake and subjected to a low-temperature plasma treatment there. The conditions in the low temperature plasma treatment were as follows:

Pressure before the low-temperature plasma treatment:

Frequency:

Power density:

Pressure curve during the plasma treatment:

Duration of the first and second treatment period:

Total treatment time:

Gas:

5pa

13.56MHz 12.5W / dm ³ Figure 1 40 seconds each 10 minutes oxygen

Subsequently, a card sliver was produced from the fibers thus treated after opening and carding and this card sliver was spun on a conventional spinning machine (manufacturer Marzoli). The resulting yarn had a fineness of about 140dtex. Thereafter, these yarns were twisted on a twisting machine with 1000 turns per meter. In parallel with this, a comparative material was produced that differs from the previously described yarn in that its fibers were not low-temperature plasma-treated prior to spinning.

Subsequently, these two materials were sewn on a conventional Knopflich industrial sewing machine (Pfaff) and counted the number of buttonholes that could be sewn without thread breakage. Furthermore, the seam length was determined on an industrial sewing machine, which could be achieved at a stitch count of 7000 stitches per minute without thread breakage. The results of these sewing trials are shown in Table 1.

Table 1: PES twofold

material

Number of buttonholes (without thread breakage)

Seam length at 7,000 stitches / min.

as fiber, subjected to low-temperature plasma treatment 40-60 comparative material without treatment 4-6

After 100 m sewing stopped, since no thread break 10m

As can be seen from this table, the material 1 made from fibers subjected to a low-temperature plasma treatment has excellent sewing performance. Here, the sewing tests were stopped after a seam length of 100m, as even with 10 sewing tests with a seam length of 100 m each no thread break occurred. In contrast, the untreated comparative material is significantly worse, as it could only 4-6 buttonholes and a seam with a length of 10 meters could be sewn.

Example 2

Two 1-kg bobbins of polyester yarn (tifilament yarnn 34, 160 dtex) were subjected to a low-temperature plasma treatment as a cross-wound bobbin on a conventional perforated dyeing sleeve.

Notwithstanding the above-mentioned conditions of Example 1, this low-temperature plasma treatment was carried out in Example 2 at a power density of 8W / dm ³ and a treatment time of 15 minutes, which also worked in this embodiment with 2 treatment periods, whose duration was 20 seconds , The pressure conditions during these treatment periods are shown in Figure 2 below.

As in the first embodiment, oxygen was flowed through during the low-temperature plasma treatment of the wound body.

In a conventionally designed air jet texturing machine, as described, for example, in DE-PS 37 20237, a core-sheath sewing thread was produced from the two treated multifilament yarns by swirling, which was subsequently provided with 350 turns per meter.

As a comparative material, a core-sheath sewing yarn was also made by the same procedure with the same starting materials, which also obtained a rotation of 350 turns per meter. This comparative material differed from the material described above in that the starting materials were not subjected to a low-temperature plasma treatment.

As already described under Example 1, the sewing behavior of these two sewing threads was investigated comparatively. Here, in the suture whose raw materials were subjected to the above-described low-temperature plasma treatment, each of the outer coil layer, the middle coil layer, and the inner coil layer was included in the comparative investigation of the sewing performance. The results of these investigations are shown in Table 2 below.

Table 2: PES core sheath yarn

Material Number of buttonholes Seam length at 7,000

(without thread break) strokes / min.

subjected as filament of a low-temperature plasma treatment

outer winding layer 60-75 after 100 m sewing test

middle winding layer 65-75 canceled, because no

Inner winding layer 62-75 thread break

Comparative material without treatment 8-10 50m

As can be seen from this Table 2, the treated material 1 has a much better sewing performance compared to the untreated comparative material, which is expressed both in a higher number of buttonhole stitching operations and in a substantially longer stitching. Thus, the tests to determine the thread break were canceled depending on the seam length at a seam length of 100 m, since even at 10 sewing attempts after 100 meters no thread break occurred. In particular, however, Table 2 shows that in material 1 no differences occur in the sewing behavior between the outer, middle and inner winding layers. In other words, these experiments clearly show that the low-temperature plasma treatment has taken place uniformly over the thickness of the wound body.

To ensure this result, sewing thread was removed from the outer, middle and inner winding layer and dyed. The colorimetric evaluation of these three samples also showed that the material stained uniformly both in terms of hue and color depth.

Example 3

A polyester twist with a twist S900, Z1000 140dtex x 2 was conventionally dyed and subjected to low-temperature plasma treatment after drying without vulcanization. Here, the presentation of the polyester twine corresponded to a customary for dyeing cheese winding (1 kg of material).

Parallel to this, a refined material was also treated in the same presentation with low-temperature plasma. The avivage is a hard paraffin finish, whereby the application of the finish was made by direct contact with the paraffin block.

As a first comparative material for the sewing experiments, an unvarnished and non-low-temperature plasma-treated identical material was selected, and as a second comparative material, an identical thread was vulcanized after dyeing as described above.

The conditions in the low temperature plasma treatment were as follows:

Pressure before low temperature plasma treatment: 5Pa

Frequency: 13.56MHz

Power density: 12.5W / dm ³

Pressure curve during the plasma treatment: Figure 1

Duration of the first and second treatment period: 40 seconds total treatment time: 10 minutes

Gas: oxygen

Subsequently, the materials were sewn on a conventional buttonhole industrial sewing machine (Pfaff) and counted the number of buttonholes that could be sewn without yarn breakage. Furthermore, the seam length was determined on an industrial sewing machine, which could be achieved at a stitch count 7000 stitches per minute without thread breakage. The results of these sewing trials are shown in Table 3.

Table 3: PES twofold

material

Number of buttonholes (without thread breakage) Seam length, 7000 stitches / minute, without thread breakage 50-60 after 100 m still no thread break Sewing test aborted 15-25 15m-20m 0 0-50 cm 2-4 4m-8m

Material 1, treated with low-temperature plasma, avivtert material 2, treated with low-temperature plasma, not scavenging comparative material 1, not treated, not scavenging comparative material 2, not treated, scoured

As can be seen from this table, the material 1, which has been refined in addition to the low-temperature plasma treatment, has excellent sewing performance. Here, the sewing test was stopped after a seam length of 100m, since even at 10 sewing try, each of yarn lengths from the inner layer, the middle layer and the outer layer of the bobbin were performed, even after every 100m no thread break occurred.

The material 2 which was not scavenged, but subjected to a low-temperature plasma treatment, shows still significantly better values compared to the untreated, anti-coarse comparison material 2, which are expressed once in the increased number of buttonholes and in a significantly higher seam length.

With the comparative material 1 could be produced industrially no seam and no buttonhole. This material is completely

not suitable.

Example 4

An entangled core sheath yarn made by air-extruding, consisting of a polyester core material 180 dtex f40 and a polyester effect material having 74 dtex f24, was subjected to low-temperature plasma treatment with and without finish, respectively.

Notwithstanding the conditions previously mentioned in Example 3, this low-temperature plasma treatment was carried out at a power density of 8W / dm ³ and a treatment time of 15 minutes, which also worked in this embodiment with two treatment periods, the duration of each 20 seconds were. The pressure conditions during these treatment periods are shown in Figure 2 below. As in the third embodiment, oxygen was flowed through during the low-temperature plasma treatment of the wound body. The results of the sewing tests on the treated and untreated comparative materials 1 and 2 are shown in the following Table 4, wherein the aforementioned block paraffin was used as Avivage. In addition, the material 2, which was subjected to the low-temperature plasma treatment as a non-classified material, was after the low-temperature plasma treatment with the aforementioned block paraffin aviviert. The results of the sewing tests are shown in Table 4 below.

Table 4: PES core yarn

material

Number of buttonholes (without thread breakage)

Seam length, 7,000 stitches / minute, without thread breakage

Material 1, treated with

Low-temperature plasma, avg. 70-90

Material 2, treated with

Low temperature plasma, not avivated 25-40

Material 3, subsequently retuned 50-60

Comparative material 1, not

treated, not aviviert 0

Comparative material 2, not

treated, avowed 5-6

after 100m no thread break, sewing attempt aborted

25m-35m 60m-70m

0-50cm 10m-15m

however, the knot at the end of the loop is replaced by two knots, and if this loop also opened in the tensile test and the yarn did not rupture, by three knots or four knots, respectively. The knots required until tearing of the yarn loop are thus a measure of knot strength, i. a measure of the slippage of the knot from the other thread. In this case, as the number of nodes increases, the knot strength decreases, with the result that the surgeon must make a corresponding number of knots to secure the surgical suture, which is secondarily complicated and undesirable. Table 5 below shows the results of the previously described test method.

Table 5: Surgical sutures

Material Number of required nodes

biszumGarnbruch

Material 1, treated in

Low temperature plasma 1-2 knots

Comparative material, untreated 4-6 knots

As shown in Table 5, with Material 1, the loops already crack when provided with one or two knots, whereas the corresponding comparison material requires four to six knots. This means that the knot strength of the treated material (material 1) is significantly better, so that only one to two knots are required in surgical procedures to secure the appropriate surgical suture.

Claims (37)

1. sewing thread with a provided on the surface structuring, wherein the sewing yarn consists of spun together, twisted and / or entangled fibers, filaments and / or yarns, characterized in that the structuring is formed as a microstructure and punctiform, linear and / or planar Indentations and / or punctiform, linear and / or surface elevations and that the microstructure extends over the entire surface of the fibers, filaments and / or yarns forming the Nähgarn or is provided on the outwardly facing surface of the sewing thread. 2. sewing thread according to claim 1, characterized in that the microstructure consists essentially of circular-like and / or circular depressions and / or elevations. 3. sewing thread according to claim 1 or 2, characterized in that the depressions or elevations have a depth or height between 0.01 μιη and 0.3μηΊ, preferably 0.18μιτι and 0.25μιη have. 4. sewing thread according to one of the preceding claims, characterized in that the depressions or elevations have a width between 0.1 μηι and 2μηι possess. 5. sewing thread according to one of the preceding claims, characterized in that adjacent depressions or adjacent elevations an axial and / or radial distance between 0.1 μιη and 2μιτι, preferably between 1.2μιη and 2μηη have. 6. A process for the production of a sewing yarn comprising a microstructure extending over the entire surface of the fibers, filaments and / or yarns forming the sewing thread, in which the fibers, filaments and / or yarns are spun together, twisted and / or swirled and subsequently If necessary, the sewing thread thus produced is dyed, dried, fixed, finished and / or rewound, characterized in that prior to spinning, twisting and / or swirling, the fibers, filaments and / or yarns of a low-temperature plasma treatment or a corona Subject to treatment. 7. The method according to claim 6, characterized in that one produces from the fibers, filaments and / or yarns a heap and flows through the debris during the low-temperature plasma treatment or corona treatment with a gas. 8. A process for the preparation of a provided on its outwardly facing surface with the microstructuring Nähgarnes, wherein subjecting the sewing yarn to a corona or low-temperature plasma treatment, characterized in that the sewing yarn before the corona or low-temperature plasma Treatment wound on a bobbin and that flows through the bobbin during the corona or low-temperature plasma treatment with a gas. 9. The method according to any one of claims 6 to 8, characterized in that one carries out the low-temperature plasma treatment at a pressure between 5Pa and 500Pa. 10. The method according to any one of claims 6 to 9, characterized in that one carries out the low-temperature plasma treatment at a pressure between 20Pa and 300Pa, preferably between 70Pa and 200Pa. 11. The method according to any one of claims 6 to 10, characterized in that in the low-temperature plasma treatment during a first treatment period, a pressure between about 5Pa and about 120Pa, preferably between 20Pa and about 120Pa, and during a subsequent second Treatment period, a pressure between about 80 Pa and about 250 Pa, preferably between about 100 Pa and about 200 Pa, sets. 12. The method according to claim 11, characterized in that one connects the first treatment period directly to the second treatment period. 13. The method according to claim 11 or 12, characterized in that the first and second treatment period is repeated several times alternately. 14. The method according to any one of claims 11 to 13, characterized in that the pressure is continuously increased or decreased during the transition from the first treatment period to the second treatment period and the transition from the second treatment period to the first treatment period. 15. The method according to any one of claims 11 to 14, characterized in that one selects a time between 10 seconds and 160 seconds, preferably between 20 and 60 seconds for the first and second treatment period. 16. The method according to any one of claims 6 to 15, characterized in that one sets at the beginning of the low-temperature plasma treatment, a pressure which is lower than the pressure during the low-temperature plasma treatment, and that then the gas until Reaching the required treatment pressure feeds. 17. The method according to any one of claims 6 to 16, characterized in that one carries out the low-temperature plasma treatment at a frequency between 1 MHz and 20MHz, preferably at 13.56MHz. 18. The method according to any one of claims 6 to 16, characterized in that one carries out the low-temperature plasma treatment at a frequency of 27,12,40,68 and / or 81,36MHz. 19. The method according to any one of claims 6 to 18, characterized in that one carries out the low-temperature plasma treatment at a power between 200W and 600W. 20. The method according to any one of claims 6 to 19, characterized in that the low-temperature plasma treatment at a power density between 2 W / dm ³ and 25W / dm ³ , preferably between 8 W / dm ³ and 14W / dm ³ , performs. 21. The method according to any one of claims 6 to 16, characterized in that the low-temperature plasma treatment at a frequency of 2.45 GHz, at a pressure between 10 " ¹ to 1000Pa, preferably between 70Pa and 120Pa and a power density between 0, 1 W / dm ³ and 5W / dm ³ , preferably between 1.5W / dm ³ and 3W / dm ³ , performs. 22. The method according to claim 7, characterized in that one produces from the fibers, filaments and / or yarns a wound body. 23. The method according to claim 6,7 or 8, characterized in that the corona treatment at a pressure between 86.659 x 10 ³ Pa and 133.32 x 10 ³ Pa, preferably at a pressure between 93.325 x 10 ³ Pa and 113.324 x 10 ³ Pa, performs. 24. The method according to claim 23, characterized in that in the corona treatment during a first treatment period, a pressure between 86.659 x 10 ³ Pa and 99.99 x 10 ³ Pa and during a second treatment period a pressure between 99.99 x 10 ^third Pa and 113.324 X 10 ³ Pa. 25. The method according to claim 24, characterized in that the first treatment period is immediately followed by the second treatment period. 26. The method according to claim 24 or 25, characterized in that the first and the second treatment period repeatedly repeated alternately. 27. The method according to any one of claims 24 to 26, characterized in that the transition from the first treatment period to the second treatment period and the transition from the second treatment period to the first treatment period, the pressure increases continuously or lowered. 28. The method according to any one of claims 24 to 27, characterized in that one selects for the first and second treatment period each time between 10 seconds and 160 seconds, preferably between 20 seconds and 60 seconds. 29. The method according to any one of claims 24 to 28, characterized in that one sets before the start of the corona treatment, a pressure which is lower than the pressure during the corona treatment, and that then the gas until reaching the required treatment pressure supplies. 30. The method according to claim 29, characterized in that setting a pressure between 1 000Pa and 10000Pa before the corona treatment. 31. The method according to any one of claims 7 to 30, characterized in that the gas is a reactive gas, preferably O ₂ , N ₂ O, O ₃ CO ₂ , NH ₃ , SO ₂ , SiCl ₄ , CCI ₄ , CF ₃ Cl , CF ₄ , SF ₆ , CO and / or H ₂ . 32. The method according to any one of claims 6 to 31, characterized in that the gas is an inert gas, preferably a noble gas, a mixture of noble gases and / or nitrogen, is used. 33. The method according to any one of claims 6 to 32, characterized in that treating the fibers, filaments, yarns or the sewing yarn between 2 minutes and 30 minutes. 34. The method according to any one of claims 7 to 33, characterized in that the fibers, filaments, yarns or sewing thread on a perforated sleeve, preferably a perforated metal sleeve, wound. 35. The method according to any one of claims 7 to 34, characterized in that flows through the heap or the winding body alternately from outside to inside and from the inside to the outside with the gas. 36. The method according to any one of claims 6 to 35, characterized in that applying a finish on the fibers, filaments, yarns or on the sewing thread before the low-temperature plasma treatment or the corona treatment. 37. The method according to any one of claims 6 to 36, characterized in that flows through the heap or the winding body with a basic or acidic gas or a basic or acidic gas mixture and the material thus treated then dyed with acidic or basic dye.