AT514843B1 - Cord-like plastic object, as well as method for producing a string-like plastic object - Google Patents

Abstract

The invention relates to a cord-like plastic object (2), which is made of a single primary strand by means of extrusion technology and which string-like plastic object (2) is further stretched in the longitudinal direction. In the cord-like plastic object (2), individual, materially interconnected fibers (35) are formed, which were produced by a mechanical breaking process.

Description

Description: The invention relates to a cord-like plastic object, as well as to a method for producing a cord-like plastic object, as specified in claims 1 and 10.

[0002] The prior art discloses a method for producing a cord which comprises the following individual steps: [0003] 1) Production of a film profiled on one side, profiled on both sides or unprofiled by means of an extruder. The shaping is done either by means of slot die, calender or chill roll, or blowing head or individual nozzles.

2) Optional: cutting the film along the longitudinal extent of the film.

3) stretching the film.

4) Optional: fibrillating the film.

5) spinning the stretched film to finished string.

6) winding the finished cord on a spool.

From W02004 / 090209 a method for producing a biodegradable cord in the form of a polymer is known, in which the polymer is melted in an extruder and then extruded through via a nozzle. The cord is then cooled and stretched to almost its breaking point. For certain applications, it is possible that the extrusion die has different shapes, and therefore the cord is given various shapes, which may also include a hollow cross-section. By stretching the cord to near its breaking point, the strength of the cord is increased. The method can therefore be subdivided into the following method steps: [0010] 1) extrusion of a molten plastic material in a spray head via a raw-forming nozzle into a raw-formed primary strand, [0011] 2) cooling and preserving this raw form of the primary strand in at least one cooling device, [0012 ] 3) stretching the raw primary strand in at least one stretch.

The known from the general state of the art method for producing a string has the disadvantage that the spinning process is very complex, which on the one hand, the processing speed is significantly reduced by this, and what further a complex machinery is needed. This makes this process very error prone and not very effective from an economic point of view. Furthermore, the cord obtained from this process is in its properties regarding strength and feel strongly in need of improvement. The method described in WO0200 / 090209 has the disadvantage that a cord made with this method is not very flexible. As a result, it is very difficult knotbar, and therefore not to use for certain types of use.

The present invention has for its object to provide an improved cord-like plastic object.

This object of the invention is achieved by the measures according to claim 1, and by a method according to claim 10.

According to the invention a cord-like plastic object is formed, which is made of a single primary strand and which is stretched in the longitudinal direction. The cord-like plastic object consists of individual, materially one-piece interconnected and produced from the primary strand fibers, which have irregular, generated by mechanical overuse in the form of a mechanical breaking process, surfaces. An advantage of the embodiment of the invention is that the cord-like plastic object is very flexible due to its individual, materially interconnected, fibers, making it ideal for lacing around tight radii. Furthermore, the plastic object can absorb a transverse force acting transversely to the longitudinal direction of the plastic object by the fact that the individual fibers are materially interconnected. With such a directed transverse force, the described plastic object has the advantage that it does not decay, but remains a compact strand. Furthermore, it is advantageous that the plastic object is made of a single primary strand. As a result, it can be produced with as few and simple steps as possible, whereby the quality of the cord-like plastic object can be increased. Furthermore, such a cord-like plastic object has an increased resistance to mechanical damage compared to conventional strings. On the other hand, the dirt adhesion to the cord-like plastic object is lowered, thereby improving the recyclability. Another noteworthy advantage over a conventional cord is that the cutting performance of the cord-like plastic object of the invention is better since there is a compact strand.

Further, it can be provided that the cord-like plastic object has cavities which are formed within the individual fibers as a closed cavity. The advantage here is that the susceptibility to splicing of the cord-like plastic object is reduced by the cavities. That is, the voids provide increased resistance to breakup of the individual fibers due to stress.

Furthermore, it can be provided that the ratio of longitudinal extent to transverse extent of the cavities in the cord-like plastic object is between 1: 1 and 20: 1, preferably between 3: 1 and 8: 1. The advantage here is that the splice susceptibility can be further reduced by these dimensions in the stretched state.

Further, it can be provided that one or more continuous cavities and a resulting by the spacing of the individual fibers hollow volume of the cord-like plastic object between 15 vol. % and 68 vol. %, preferably between 30 vol. % and 50 vol. % of the volume of the cord-like plastic object amount. This improves the susceptibility to splicing or the feel. The volumetric proportion of the continuous cavity, as well as resulting from the spacing of the individual fibers hollow volume in the cord-like plastic objects (also referred to as plastic strand), that is not provided with material space, which is located within the outer contour and not within the individual fibers as a closed Cavity is present. This proportion is measured by a test piece in the length of one meter by the following method steps: calculation of the volume of a comparable solid body due to the outer contour; Determination of the actual density of the material; Measuring the mass of the one-piece specimen; Calculation of the material volume from density and mass; Comparison of the two volumes.

In addition, it can be provided that the cavities of the cord-like plastic object between 2 vol. % and 5 vol. % of the volume of the cord-like plastic object amount. This improves the susceptibility to splicing or the feel. The volumetric portion of the cavities is that non-materialized space which exists as a closed cavity within the material. This proportion is measured through a test piece weighing 100 g by the following procedure: determination of the displacement volume of the 100 g test piece; Calculation of the volume of a 100g block of the same plastic without the cavities inclusions; Comparison of the two volumes.

Further, it can be provided that the length of a single fiber of the cord-like plastic object of a node in which the fiber is materially connected to another fiber of the cord-like plastic object, to a further node on average, in which the fiber materially with a further fiber of the cord-like plastic object is between 1 mm and 7 mm. It is advantageous here that a cord-like plastic object with such a fiber length is very elastic and flexible.

Furthermore, a cord-like plastic object having such a fiber length has a good knot seat when knotting the cord-like plastic object.

In a further development it can be provided that the individual fibers, transversely to the longitudinal orientation of the fiber, have puncture holes. It is advantageous here that the cord-like plastic object becomes softer through the puncture holes, which also makes it more flexible. Thereby, the knot seat of the cord-like plastic object can be improved. Furthermore, it also improves the feel of the string-like plastic object.

Further, it may be provided that the diameter of the cord-like plastic object is between 0.5 mm and 20 mm, preferably between 1 mm and 10mm. In particular, this diameter range is advantageous for a cord-like plastic object since all areas of application or all application requirements can be covered with a string-like plastic object in such a diameter range.

According to an advantageous development can be provided that in the cord-like plastic object adhering to the individual fibers, applied in the form of an aerosol, additive is introduced. It is advantageous here that such an additive applied in the form of an aerosol can already be introduced during the extrusion process. The additive can be, for example, an agent which protects against rodent biting by containing ingredients which are a repulsive odor and / or flavor especially for this kind of animal. Furthermore, for example, an additive can be introduced which prevents animals from eating the string-like plastic object. In this case too, ingredients may be present which represent a repulsive odor and / or taste especially for one of these animal species.

In the method for producing a cord-like plastic object, comprising providing a thermoplastic material and its melting in an extrusion device, it is provided that the method has at least one new compared to the prior art. This is a process step in which the cooled and drawn strand obtained from the extrusion process is broken in a breaking device, whereby individual fibers are formed.

It is advantageous in such a method that a cord-like fiber formation can be produced by the process step in which the primary strand is mechanically processed. As a result, a cord-like plastic object can be produced without requiring a spinning process. As a result, not only the process speed can be increased, but the entire process is less susceptible to error, since a complex process step can be omitted.

Furthermore, it can be provided that the strand is broken with a crushing device having gear-like intermeshing rollers. The advantage here is that a crushing process by means of gear-like intermeshing rollers can run continuously. Furthermore, surprisingly, a very good result can be achieved with respect to the defibration of the drawn strand, since the fibers produced thereby have a fiber length between 1 mm and 7 mm, and are distributed uniformly over the longitudinal extent of the cord-like plastic object.

Furthermore, it may be appropriate that the method includes at least a fifth step in which the already mechanically processed strand is mechanically processed by needle rollers. It is advantageous in the treatment of the strand by means of needle rollers that the surface of the individual fibers are pierced or pierced transversely to the longitudinal direction of the fiber by the needle rollers. As a result, the string-like plastic object resulting from this process becomes softer, as a result of which it can be well knotted on the one hand and has improved feel on the other hand.

Furthermore, it can be provided that, between the second and third process step, a one-stage or multi-stage heating of the raw-formed primary strand takes place via at least one warm-up device. The advantage here is that by heating the Primärstran ges the structure of the plastic can be brought to an advantageous temperature for mechanical processing.

In addition, it may be appropriate that the strand immediately after the drawing process in step 3, is cooled. It can thus be achieved a consolidation of the microstructure in the plastic.

Furthermore, it can be provided that the stretched strand is withdrawn at a process speed between 250 m / min and 500 m / min, preferably between 350 m / min and 450 m / min. It is particularly advantageous in this case that this process speed is matched to the breaking process in process step four. The breaking process may thus proceed at a process speed which contributes to the production of a fiber of the desired length and shape.

According to an advantageous development can be provided that the molten plastic material in the extrusion process, an additive is added, which form small voids in the primary strand. The addition of an additive is to the advantage that the resulting voids during the manufacturing process and in the finished end product ensure that the susceptibility to splice is reduced. Furthermore, this can improve the feel of the cord-like plastic object, since it is softer. By making the cord-like plastic object softer by the additive, its knotability can be further improved. The voids may be generated by an additive in the form of a foaming agent, in the form of fillers or inorganic constituents or by incorporation of an incompatible polymer mixture, or by the introduction of a gas.

Furthermore, it may be appropriate that the raw-forming nozzle is designed so that at least one continuous cavity along the longitudinal direction is generated in the primary strand. It has surprisingly been found that due to the cavity of the primary strand in the mechanical processing in the fourth step can be broken well. Therefore, the individual fibers can form well in the fourth step.

According to a further development can be provided that via the raw-forming nozzle an additive in the form of an aerosol is introduced into the continuous along the longitudinal orientation of the primary strand cavity. It is particularly advantageous in this case that the aerosol, if it is introduced into the hollow space running through along the longitudinal extent of the primary strand, can not escape during the first processing steps. In the mechanical processing operation in the fourth processing step, the aerosol can then distribute evenly in the cord-like plastic object. It is further advantageous here that such an additive applied in the form of an aerosol can already be introduced during the extrusion process. The additive can be, for example, an agent which protects against rodent biting by containing ingredients which are a repulsive odor and / or flavor especially for this kind of animal. Furthermore, for example, an additive can be introduced which prevents animals from eating the string-like plastic object. In this case too, ingredients may be present which represent a repulsive odor and / or taste especially for one of these animal species.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

In each case in a highly simplified, schematic representation: FIG. 1 shows a schematic representation of a method sequence for the production of a cord-like plastic object; [0037] FIG. FIG. 2 shows possible cross sections of a primary strand from the extrusion; FIG. Fig. 3 is a schematic representation of a section along the longitudinal orientation through a primary strand; Fig. 4 is a schematic representation of a section along the longitudinal direction through a stretched strand; Fig. 5 is a side view and cross section of a cord-like plastic object; Fig. 6 is a side view of a cord-like plastic object under application of a lateral tensile force.

The term cord-like plastic object 2, which is used in this description, can be regarded as a synonym for the term plastic cord.

1 shows the schematic representation of a plant 1 for producing a cord-like plastic object 2, or the schematic process sequence for producing the cord-like plastic object 2.

In a first method step, thermoplastic material 3 is melted in an extrusion device 4 and pressed through a nozzle 5. In particular, polyolefins, polyethylene terephthalate or polyamide, or mixtures thereof are used for extrusion.

Furthermore, it can be provided that the cord-like plastic object 2 consists of a polymer selected from the group of polyolefins, polyethylene terephthalate or polyamide, or mixtures of these polymers. In addition, it can be provided that the cord-like plastic object comprises a polymer selected from the group of polyolefins, polyethylene terephthalate or polyamide, or mixtures of these polymers. It is advantageous here that especially polyolefins, polyethylene terephthalate or polyamide are outstandingly suitable for processing in an extrusion process. Furthermore, these plastics can be stretched very well, whereby very good strength properties can be achieved. Other plastics with advantageous properties which are suitable for use in the production process of a cord-like plastic object are: bioplastics such as PLA, LDPE, HDPE, LLDPE, MDPE, TPE, PET, PS, EVA.

For the purposes of this specification, E in plastic is an organic, polymeric solid which is produced synthetically or semi-synthetically from monomeric organic molecules or biopolymers.

E in polyolefin in the sense of this description is a collective term for polymers prepared from alkenes such as ethylene, propylene, 1-butene or isobutene by polymerization or polyolefin copolymers such as polyethylene and polypropylene.

Mixtures of the individual plastics can be prepared by mixing during the extrusion process.

The forming tool is attached to the extruder. The shaping takes place by smooth or structured nozzles or mandrel or wire guide.

The nozzle 5 is in this case attached to a nozzle holder 6. By the extrusion process, a primary strand 7 is generated, which receives its shaping through the nozzle 5. The shaping takes place by means of smooth or structured nozzles 5 or mandrel or wire guide. The fastening element 6 can be designed as a hose head, pipe head, crosshead or spinneret.

It is quite conceivable that instead of just one nozzle 5 a plurality of nozzles 5 are mounted on the nozzle holder 6. Here, in a practical embodiment, four to eight nozzles 5 may be mounted on the nozzle holder 6, whereby a plurality of primary strands 7 can be produced, which can also be processed simultaneously.

The nozzle 5 may be replaceably mounted in the nozzle holder 6. This makes it possible that the system 1 and the extrusion device 4 can be easily and quickly converted to the production of various, cord-like plastic objects 2. The individual nozzles 5 may in this case be provided for example for the extrusion of different shapes and sizes of the outer contour. Furthermore, it can be provided that one or more pin elements are mounted in the nozzle 5 in order to produce a hollow profile in the primary strand 7. Possible cross-sectional shapes of the primary strand 7 are shown in more detail in FIG. 2, or will be described in more detail below.

The exiting from the nozzle 5 primary strand 7 can then be performed on the extrusion process by a cooling device 8 in order to be able to perform a further processing. Furthermore, it can be provided that the exiting from the nozzle 5 primary strand 7 in the air, is cooled to the extent that the primary strand 7 is fixed and can be further processed.

The cooling device 8 in this case be designed, for example, as a water bath 9. In principle, however, any type of cooling device 8 for cooling the primary strand 7 is conceivable.

The water bath 9 used in this embodiment has a length 10 of about 3 meters in order to cool the primary strand 7 sufficient. To optimize the cooling performance can also be provided that the primary strand 7 is not shown as shown only once through the water 9, but that in the water bath 9 deflecting elements are arranged, whereby the primary strand 7 can be performed several times through the water 9. Furthermore, a longer water bath 9 can be provided to increase the cooling capacity.

Furthermore, it can be provided that the water bath 9 is divided, for example, by partitions 11 into a plurality of zones 12. In these individual zones 12, for example, water with different temperatures can be used. It is also conceivable that in individual zones 12, the water is vortexed to increase the cooling capacity. Advantageously, the water bath 9 is provided with a fresh water supply to provide constantly cool water can.

Subsequent to the water bath 9, a spraying device 13 may be provided, through which the primary strand 7 is further cooled. Alternatively, a heating element or emitter may be provided to dry the primary strand.

As a result, a discharge device 14 may be provided for the withdrawal of the primary strand 7 from the water bath 9. The take-off device 14 may be designed, for example, as a galette trio. In order to further cool the primary strand 7, it may also be provided that the individual roller elements 15 of the draw-off device 14 are cooled.

In connection with the withdrawal device 14, a further transport device 16 may be provided, which may likewise be designed as a galette trio. In this case, it is possible that the individual roller elements 15 are heated in order to heat the primary strand 7.

At the beginning of the stretching section 17, a certain travel speed for the primary strand 7 is predetermined by the transport device 16. At the end of the stretching section 17 is another transport device 18. The withdrawal speed of the further transport device 18 is selected to be greater than that of the transport device 16. Thus, the primary strand 7 along the stretching line 17 in its longitudinal direction 19 is pulled monoaxially in the length. By this stretching, a stretched strand 20, which is present in the process sequence from the further transport device 18. The draw ratio is in a range between 4 and 16, preferably between 8 and 12.

In order to be able to carry out the stretching operation, provision can be made for one or more warming-up devices 21 to be provided along the stretching section 17, through which the primary strand 7 is brought into an advantageous processing temperature for the drawing process. The selection of the advantageous processing temperature depends on the particular plastic to be processed.

Subsequent to the further transport device 18, the stretched strand 20 can be passed through a further cooling device 22 to bring it to an appropriate temperature for further processing. In addition, or as a substitute for it is also conceivable that, for example, the individual roller elements 15 of the further transport device 18 are cooled in order to achieve the necessary cooling of the stretched strand 20.

Subsequently, the stretched strand 20 is guided into a breaking device 23, where it is mechanically processed so that 20 individual fibers 35 are formed by the action of force on the stretched strand. The resulting strand is still shown in Fig. 4 or described in more detail below.

In the embodiment shown schematically here, the breaking device 23 is designed in the form of two interlocking rollers 24. The two intermeshing rollers 24 in this case have a gear-like profile, whereby the stretched strand 20 is mechanically broken, and thereby individual fibers 35 arise. The individual fibers 35 are formed by bending the stretched strand 20 by such a small radius that it is loaded beyond its mechanical load limits. As a result, the profile of the stretched strand 20 tears substantially along its longitudinal direction 19, whereby individual fibers 35 with a length between 1 mm and 7 mm form. Thus, the fibers 35 resulting from this process are not joined together by an adhesive process, nor by a resin matrix or a thermal process, but are part of the primary strand 7 in which longitudinal cracks have been produced by the process described, whereby the fibers 35 were formed. It is essential that these fibers 35 are never present as individual fiber strands during the course of the process.

By choosing the geometry of the rollers 24 in this case the fiber length or the shape of the individual fibers 35 can be influenced in the strand. Further, for example, spring elements 25 may be provided by which the two intermeshing rollers 24 are compressed to obtain a constant force on the stretched strand 20. As a result, it is also possible that stretched strands 20 with different geometries or with different diameters are processed in the breaking device 23.

The outgoing from the breaking device 23 strand is referred to as defibrated strand 26. The fiberized strand 26 may be mechanically further processed by one or more needle rollers 27 to improve the surface finish. Here, the needle rollers 27 may be similar to the crushing device 23 already described opposite to each other. Again, it is possible that a spring element 25 is formed to hold the pressure exerted by the two needle rollers 27 on the shredded strand 26, to keep constant. At the needle rollers 27, a plurality of small needles 28 are mounted, which pierce transversely to the longitudinal direction 19 in the individual fibers of the shredded strand 26 in order to make it more supple.

The treatment by needle rollers 27 has proven to be a very advantageous processing option. However, it is conceivable that instead of the needle rollers 27, the following methods are used for surface treatment: rolling, stinging, needles, compressed air, rams, laser, blasting by means of solid or liquid substances, fibrillation, perforation, etc.

At the end of these possible processing operations, the cord-like plastic object 2 is obtained as the starting product. As the last method step, provision may be made for the cord-like plastic object 2 to be wound onto individual coils 30 by means of a winding device 29.

The coils 30 are in this case driven by the winding device 29, so that a certain, predefined train on the cord-like plastic object 2 is formed. The strength of the train is adjusted, which determines how tight the cord-like plastic object 2 can be wound onto a spool 30.

It has been found that the manufactured by the process described above, cord-like plastic object 2 with the same tensile force wound closer to the coil 30 who can as a conventionally produced cord with a comparable diameter. This leads to the advantage that the coils can be packed more densely, it is advantageous that the cord-like plastic object according to the invention, due to its manufacturing process, has a smooth surface, whereby on the one hand the susceptibility to snarl is reduced.

It is quite conceivable that, to further improve the properties of the cord-like plastic object 2, further mechanical or chemical processing steps are integrated into the process. These further processing steps can be inserted between the individual process steps or at the end of the process.

FIG. 2 shows possible cross-sectional shapes of the primary strand 7. It can be seen that the outer contour 31 of the cross section can be chosen not only rectangular, circular or oval, but that any desired contour can be selected. Here, the center distance 32 seen over the circumference of the outer contour 31, be divided irregularly. Furthermore, it may be expedient that the tube forming nozzle 5 is formed so that the outer contour 31 of the primary strand has an irregular center distance 32 as seen over the circumference, wherein the average center distance 32 of the outer contour 31 is approximately circular.

Furthermore, a continuous cavity 33 along the longitudinal alignment 19 may be provided in cross-section of the primary strand 7. This continuous cavity 33 serves to facilitate the breaking process by means of the breaking device 23. Furthermore, the arrangement or size of one or more continuous cavities 33 may influence the length of the individual fibers 35.

In addition, it is possible that in the extrusion device 4, in particular in the nozzle 5, an additive in the form of an aerosol can be mounted in the continuous cavity 33. This additive may for example be a substance that protects against rodent bite.

Fig. 3 shows a schematic representation of a section along the longitudinal alignment 19 through the primary strand 7. The primary strand 7 shown here for illustration has no continuous cavity 33 and is shown as a circular cross-section. Here, small cavities 34 are shown, which are introduced during the extrusion process in the extrusion apparatus 4 using an additive in the primary strand 7. These cavernous cavities 34 can be generated, for example, by introducing a foaming agent, by introducing chalk or by introducing a gas.

As a result of the machining process, these cavities 34 serve to reduce the susceptibility to splicing of the cord-like plastic object 2. Furthermore, it could be stated that, in addition to improving the feel of a cord-like plastic object with cavities 34, an improvement in the strength values can also be achieved.

Fig. 4 shows a schematic representation of the shape of the cavities 34, as they are to be found in a stretched strand 20 after the stretching section 17.

Fig. 5 shows schematically in a side view and in a cross-sectional view a cord-like plastic object 2 as it may look at the end of the machining process. The section shown here of the cord-like plastic object 2 is under no external force, whereby here the shape of an unloaded object is shown.

In this case, it can be roughly recognized from which profile in the primary strand 7 the cord-like plastic object 2 was produced. The continuous cavities 33 are still partially recognizable in this final state of the product. Furthermore, the individual fibers 35, which were produced during the machining process, can be seen here. The diameter 36 of this cord-like plastic object 2 can be in the unloaded state between 0.5 and 20 mm, preferably between 1 and 10 mm.

Fig. 6 shows a schematic representation of a side view of the same cord-like

Plastic object 2 which is shown in Fig. 5. However, in this figure, the cord-like plastic object 2 is loaded with a lateral pulling force 37, so that it is pulled apart transversely to the longitudinal direction 19.

The cavities 34, which are shown in Fig. 4 in the stretched state, can in an advantageous embodiment, a ratio of longitudinal extension 38 to transverse extent 39 of the cavities in the cord-like plastic object between 1: 1 and 20: 1, preferably between 3: 1 and 8: 1. This aspect ratio depends on the degree of stretching of the plastic. Experiments have shown that a cord-like plastic object, in which the cavities 34 are formed according to the above-mentioned conditions, has a particularly reduced susceptibility to splicing. In this case, the longitudinal extension 38 of such a cavity 34 is approximately between 1000 pm and 200 pm, preferably between 700 pm and 350 pm. The transverse extent 39 of such a cavity 34 is approximately between 150 pm and 50 pm, preferably between 115 pm and 80 pm.

The Young's modulus along the longitudinal orientation of at least one of the individual fibers 35 may be between 2,500 MPa and 15,000 MPa, preferably between 4,000 MPa and 12,000 MPa. It is advantageous in a modulus of elasticity according to ISO 527 in the mentioned range that the rigidity of the cord-like plastic object 2 is sufficient to enthrall objects so tight, while an excessive elongation of the cord-like plastic object 2 hinanzuhalten. Particularly in this range of values, the modulus of elasticity is advantageous in order to be able to meet the requirements for a cord-like plastic object 2 with regard to its rigidity.

Furthermore, it can be provided that the tensile strength along the longitudinal orientation of at least one of the individual fibers 35 is between 100 MPa and 500 MPa, preferably between 150 MPa and 350 MPa. The advantage here is that the tensile strength of the cord-like plastic object 2 is sufficient by the said, determined in accordance with ISO 527, mechanical properties in the tensile case, so that objects can be tightly tied. Tensile strength values in this range can be used to generate a product which, for example, can be made thinner at the same load as conventional cords. Or else it is also possible that with the same thickness of the cord-like plastic object 2 compared to a conventional cord, the force-absorbing capacity of the cord-like plastic object 2 is better compared to a conventional cord.

The embodiments show possible embodiments of a method or a system 1 for producing a cord-like plastic object 2, or the cord-like plastic object 2 per se.

REFERENCE LIST 1 Appendix 30 Coil 2 cord plastic object 31 outer contour 3 thermoplastic material 32 center distance 4 extrusion device 33 continuous cavity 5 nozzle 34 cavity 6 nozzle holder 35 fibers 7 primary strand 36 diameter 8 cooling device 37 lateral pulling force 9 water bath 38 longitudinal extension 10 length 39 transverse extension 11 dividing wall 12 zone 13 Spraying device 14 Take-off device 15 Roller element 16 Transport device 17 Stretching section 18 Further transporting device 19 Longitudinal alignment 20 Stretched strand 21 Warming-up device 22 Further cooling device 23 Breaking device 24 intermeshing rolls 25 Spring element 26 fibrillated strand 27 Needle rollers 28 Needle 29 winding device

Claims (19)

1. A cord-like plastic object (2) consisting of a plastic strand, which is made of a single primary strand (7) and which is stretched in the longitudinal direction, characterized in that this consists of individual, without additive, materially one-piece interconnected and from the primary strand ( 7) produced fibers (35), which fibers (35) have irregular, generated by mechanical overuse in the form of a mechanical breaking process, surfaces. 2. A cord-like plastic object according to claim 1, characterized in that the plastic strand Flohlräume (34), which are formed within the individual fibers (35) as a closed cavity (34). 3. A cord-like plastic object, according to claim 1 or 2, characterized in that the ratio of longitudinal extent (38) to transverse extent (39) of the cavities (34) in the plastic strand between 1: 1 and 20: 1. 4. String-like plastic object, according to one of the preceding claims, characterized in that one or more continuous cavities (33) and a by the spacing of the individual fibers (35) resulting hollow volume of the plastic strand between 15 vol. % and 68 vol. % of the volume of the plastic strand. 5. String-like plastic object, according to one of the preceding claims, characterized in that the cavities (34) of the plastic strand between 2 vol. % and 5 vol. % of the volume of the plastic strand. 6. A cord-like plastic object, according to one of the preceding claims, characterized in that the length of a single fiber (35) of the plastic strand from a node in which the fiber (35) is materially connected to another fiber (35) of the plastic strand until to another node, in which the fiber (35) is materially connected to another fiber (35) of the plastic strand, on average between 1 mm and 7 mm. 7. String-like plastic object according to one of the preceding claims, characterized in that the individual fibers (35), transverse to the longitudinal direction (19) of the fiber (35), have recessed holes. 8. String-like plastic object, according to one of the preceding claims, characterized in that the diameter (36) of the plastic strand is between 0.5 mm and 20 mm. 9. A cord-like plastic object, according to one of the preceding claims, characterized in that in the plastic strand to the individual fibers (35) adhering, applied in the form of a protecting against Nagerverbiss protective aerosol, additive is introduced. 10. A method for producing a cord-like plastic object (2), comprising the provision of a thermoplastic material and its melting in an extrusion device (4), the method comprising at least the following sequential steps: 1) extrusion of the molten plastic material in a nozzle holder (6) via 3) stretching the raw primary strand (7) in at least one stretching section (17), characterized in that the method is a raw-forming nozzle (5) to a raw-formed primary strand (7), 2) cooling and preserving this raw form of the primary strand has at least one further, fourth method step, in which the strand obtained from the extrusion process is broken in a breaking device (23), whereby individual fibers (35) form. 11. The method according to claim 10, characterized in that the strand with a breaking device (23) is broken, the gear-like intermeshing rollers (24). 12. The method according to claim 10 or 11, characterized in that the method includes at least a fifth method step, in which the already mechanically processed strand is mechanically processed by means of needle rollers (27). 13. The method according to any one of claims 10 to 12, characterized in that between the second and third process step, a one- or multi-stage heating of the raw-formed primary strand (7) via at least one warm-up device (21). 14. The method according to any one of claims 10 to 13, characterized in that the further processed strand immediately after the drawing process in step 3, is cooled. 15. The method according to any one of claims 10 to 14, characterized in that the stretched strand (20) at a process speed between 250 and 500 m / min, preferably between 300 and 450 m / min is withdrawn. 16. The method according to any one of claims 10 to 15, characterized in that the molten plastic material in the extrusion process, an additive, such as a foaming agent or chalk or a supplied gas is added to form small voids (34) in the primary strand (7). 17. The method according to any one of claims 10 to 16, characterized in that the raw-forming nozzle (5) by within the nozzle geometry attached elements, such as by attaching pin elements, is so formed that in the primary strand (7) at least one along a longitudinal orientation ( 19) of the cord-like plastic object (2) continuous cavity (33) is generated. 18. The method according to claim 17, characterized in that via the raw-forming nozzle (5) an additive in the form of protecting against Nagerverbiss aerosol in the along the longitudinal direction (19) of the primary strand (7) continuous cavity (33) is introduced. 19. The method according to any one of claims 10 to 18, characterized in that the cooling of the primary strand (7) in step two by performing the primary strand by a cooling device (8) is achieved. For this 3 sheets of drawings