Apparatus for producing synthetic threads from recycled plastic waste

Abstract

An apparatus for producing synthetic threads from recycled plastic waste comprises a pre-treatment device for pre-treating textile plastic waste; a melting device for melting pre-treated plastic waste to form a plastic melt; and a spinning device for extruding threads from a plastic melt produced by the melting device.

Description

[0001] Device for producing synthetic threads from recycled

[0002] plastic waste

[0003] The present invention relates to a device for producing synthetic threads from recycled plastic waste. The present invention also relates to the use of such a device and a method for producing synthetic threads from recycled plastic waste.

[0004] Material recycling for the recovery of plastics, for example from so-called PET bottles, is becoming increasingly important. The prior art describes processes for recycling plastics in which a recycled material is melted and the plastic melt is subsequently filtered and degassed to obtain the purest possible polymer melt for reuse.

[0005] A method and a device for recycling plastics are disclosed, for example, in WO 2020 / 104432 A1. According to this prior art, a recycled material in the form of PET flakes is fed into the respective device and melted in a melting extruder. Such a device is therefore geared towards feeding PET flakes, and consequently, the possibilities for recovering plastics are limited. Other forms or types of waste plastics cannot be readily processed using a device shown in WO 2020 / 104432 A1.

[0006] The processing of recyclable material into so-called PET flakes is widely known and used extensively in industry. However, the processing into such PET flakes is time-consuming and costly. Furthermore, the processing of recycled plastic fibers is also complex and requires separate pretreatment before, for example, granules can be processed into plastic threads in plastic spinning plants. The equipment used in known recycling plants, such as those published in WO 2020 / 104432 A1, is generally inadequate to handle recycled fibers and their admixture with recycled material.Against the background outlined above, the object of the present invention was to provide a device for producing synthetic threads that can be operated with improved resource efficiency and greater flexibility regarding the characteristics of the supplied plastic waste. Furthermore, the object was to provide a use of such a device and a method for producing synthetic threads from recycled plastic waste.

[0007] With respect to the device, this object has been achieved by the subject matter of claim 1. A use according to the invention is specified in claim 16, and a method according to the invention is specified in claim 17. Advantageous embodiments are the subject matter of the respective dependent claims and are explained below.

[0008] An apparatus for producing synthetic threads according to a first aspect of the invention is equipped with a pretreatment device for pretreating textile plastic waste, with a melting device for melting pretreated plastic waste to form a plastic melt, and with a spinning device for extruding threads from a plastic melt produced by the melting device.

[0009] Through pretreatment, melting, and subsequent extrusion or spinning of the spun threads, synthetic waste, plastic textiles, and production waste can be recycled in a particularly simple and cost-effective manner to produce new synthetic threads. Mixtures of fiber, textile, film, and / or bottle waste can also be processed particularly advantageously in this way.

[0010] Synthetic threads, for the production of which a device according to the invention can be designed, can consist, for example, of polyester, in particular of polyethylene terephthalate (PET), and can be classified according to properties, for example, into the categories POY (partially oriented yarn); FDY (fully drawn yarn); IDY (industrial yarn); SF (staple fiber); PSF (polyester staple fiber); BCF (bulk continuous filament). The pretreatment device provided according to the invention can therefore be designed for the pretreatment of textile plastic waste made of polyester, in particular of polyethylene terephthalate (PET).

[0011] For the purposes of the present invention, textile plastic waste can be, in particular, threads, yarns, fabrics, woven fabrics, films, and / or textile fabrics and / or film-like fabrics. The pretreatment device provided according to the invention can thus ensure a broad spectrum for the reprocessing of different types and forms of plastic waste.

[0012] According to a preferred embodiment, the pretreatment device can be arranged upstream of the melting device. This advantageously allows for direct feeding into the melting device and ensures an overall compact design of the device.

[0013] Furthermore, it can be provided, additionally or alternatively, that the pretreatment device is designed for the mechanical pretreatment of textile plastic waste. Mechanical pretreatment can advantageously change the shapes of the waste plastics that are undesirable for further processing or adapt them for the subsequent melting process. This allows for an overall compact design and reduces the energy requirements of the entire process or device.

[0014] Furthermore, according to a preferred embodiment, it can be provided, additionally or alternatively, that the pretreatment device is designed for the pretreatment of threads, yarns, materials, woven fabrics, films and / or textile sheet materials and / or textile plastic waste made of polyethylene terephthalate (PET). This enables a specific design of the device for the production of new threads from PET. Alternatively, the pretreatment device can also be designed to pretreat polymers in general or all types of polymers, thereby improving the flexibility of use. According to a further advantageous embodiment, the pretreatment device has a plurality of treatment devices, in particular for carrying out several successive pretreatment steps for textile plastic waste.This makes it easy to specifically influence, for example, the particle size, granularity, water content, and / or density of the pretreated material. Treatment devices can include, for example, a shredding device, a pre-drying device, and / or a compacting device. The compacting device only compacts the shredded plastic waste; clumping and agglomeration do not occur. This means that no additional heat is introduced, which could cause the shredded textile plastic waste to melt and / or stick together.

[0015] According to a particularly preferred embodiment, the pretreatment device can be provided with at least one comminution device, in particular a cutting mill, for the mechanical comminution of textile plastic waste. This advantageously allows the material to be pretreated to be processed into granules, powder, small particles, and / or short thread sections and / or small textile sections, which can be further processed particularly advantageously. In particular, fibers, nonwovens, and / or filaments from textile plastic waste can be converted into synthetic filaments and / or fibers into fibers, nonwovens, and / or filaments in a single-step process. This is advantageously supported by the compaction device, which prevents the plastic waste from fusing together.

[0016] According to a preferred development, the pretreatment device comprises at least one pre-drying device for pre-drying and / or equalizing the moisture content of textile plastic waste, in particular shredded textile plastic waste. Such a pre-drying device can preferably be arranged downstream of the shredding device. Pre-drying the material, particularly originating from the shredding device, evaporates and / or removes bound liquids, so that the dried material can be further improved for further processing. Arranging the pre-drying device downstream of the shredding device enables particularly advantageous drying, since shredded material has a larger surface area and liquid can be removed more quickly.It is also possible to adapt the drying process to the requirements of the shredded material. Adjustments can be made once or on an ongoing basis.

[0017] Furthermore, according to an advantageous development, the pretreatment device can comprise at least one compaction device for compacting textile plastic waste. This allows the density and / or volume of the materials to be recycled to be advantageously adjusted for further processing. Such compaction can be particularly advantageously carried out with regard to feeding into a melting extruder, so that suitable melting without local temperature peaks can only take place in the melting extruder. No melting takes place during compaction. The compaction takes place below the melting temperature of the plastic waste to be recycled.

[0018] With such compaction, particularly shredded and / or pre-dried textile plastic waste can be compacted. This allows the melting device to be fed with appropriately pretreated textile and / or fiber material, which is particularly advantageous for the recycling process and the subsequent production of synthetic fibers after melting. The compaction device can preferably be arranged downstream of the pre-drying device. This results in a particularly advantageous process sequence.

[0019] According to a further advantageous embodiment, the compaction device can be designed as a screw compressor. This advantageously allows a constant volume flow to be delivered to a subsequent device station. This is particularly advantageous when the compaction device is arranged for the direct feeding of textile plastic waste into the melting device. A melting device supplied with a constant volume flow can be operated in a particularly advantageous manner, in particular with relatively low temperature gradients within the material to be recycled. Furthermore, this avoids refilling of the subsequent device stations, in particular the melting device, which interrupts the recycling and production process.

[0020] In a further preferred embodiment, the melting device can be designed as a melting extruder. A melting extruder enables continuous material discharge, so that plastic melts can be processed particularly advantageously for the production of fibers. The melting extruder can be particularly advantageously designed as a single- or multi-screw melting extruder and / or a vacuum melting extruder, so that a higher and / or better homogenized volume flow can be generated.

[0021] Furthermore, according to a preferred embodiment, the device can comprise at least one filter device for filtering a plastic melt and / or for multi-stage filtering of a plastic melt. Filtration or multi-stage filtration can achieve a high degree of purity in the plastic melt.

[0022] By first filtering the plastic melt, especially under a pressurized atmosphere, coarse solid particles and impurities can be removed from the molten recycled material. A subsequent second filtration, for example, with integrated degassing, can be carried out with appropriate fineness to first remove the solids before the actual degassing. This allows the plastic melt to be highly homogenized, allowing it to be immediately discharged for final processing.

[0023] By filtering in a vacuum atmosphere, the filtered plastic melt can be degassed directly. This allows for relatively large contact zones between the plastic melt and the vacuum atmosphere, and the volatile components can be released from the plastic melt in a relatively short residence time. Furthermore, the device according to the invention can comprise at least one melt pump for conveying a plastic melt. This enables the appropriate conveyance of the plastic melt within the device.

[0024] The filter device, in particular a first filter device and / or a second filter device, and / or the melt pump can preferably be arranged between the melting device and the spinning device. Filtration of a melt provided by the melting device increases the purity of the melt for subsequent process steps and subsequently enables the production of high-quality fibers.

[0025] Furthermore, according to a further embodiment of the device, at least one degassing device for degassing a plastic melt can be provided, wherein the degassing device can preferably be arranged between the melting device and the spinning device, in particular between the melt pump and the spinning device. This can reduce bubble formation or gas inclusions in the melt and further improve the purity of the melt, thus ensuring a high quality of the end products from the spinning device.

[0026] Such a degassing device can particularly preferably be a second filter device arranged downstream of a first filter device.

[0027] Additionally, it can be provided that the degassing device is designed for filtering and / or decontaminating a plastic melt and / or for degassing a plastic melt by means of a negative pressure, in particular a high vacuum of 1 to 50 mbar. Due to the low pressure, gases within the plastic melt can be discharged or removed particularly effectively. Furthermore, filtration in the degassing device can be carried out in addition to further filtering in filter devices of the device. This allows impurities in the plastic melt to be removed particularly reliably. Finally, in an advantageous development, the degassing device can be designed to increase an intrinsic viscosity of the plastic melt of up to 0.15 dl / g and / or to homogenize the viscosity and / or to produce a spinnable plastic melt.By homogenizing the viscosity of the degassed plastic melt, especially up to a value of 0.15 dl / g, the IV value for melt spinning of the final product can be particularly favorably influenced, thus ensuring high quality of the produced threads. Particularly advantageous is the production of a spinnable plastic melt in the degassing device, which allows the device for producing the synthetic fibers to be designed compactly and cost-effectively.

[0028] If the viscosity is to be increased further, the device can, according to a further advantageous embodiment, have a residence reactor for receiving a pre-filtered and / or degassed plastic melt.

[0029] A residence reactor can preferably have a driven screw shaft for conveying the plastic melt and / or be arranged downstream of the degassing device. A residence reactor with a driven screw shaft is also referred to as a disc reactor. A residence reactor or a disc reactor advantageously allows for further homogenization of the plastic melt in addition to generating a higher viscosity. A screw shaft is particularly suitable for further homogenization, as it further mixes the plastic melt and can thus convey it at a largely constant speed and evenly.

[0030] According to a further advantageous embodiment, the residence reactor can be designed to increase the intrinsic viscosity of a received plastic melt. Additionally or alternatively, the residence reactor can be designed to produce a spinnable plastic melt. This allows the plastic melt to be tailored for use in a downstream spinning device. Particularly preferably, the residence reactor can be designed to increase the intrinsic viscosity to up to 1.1 dl / g. In this way, high-quality fibers or particularly durable plastic fibers can be produced from waste plastics.

[0031] A residence reactor can be particularly advantageous if BCF and / or IDY threads are produced in the subsequently arranged spinning device or if the spinning device is designed and / or configured to produce BCF and / or IDY threads.

[0032] In a further preferred manner, the device can comprise a discharge extruder for discharging a plastic melt to the spinning device. Additionally or alternatively, the device can comprise a discharge pump for discharging a plastic melt to the spinning device. A discharge extruder and / or a discharge pump can preferably be arranged downstream of the degassing device and / or the residence reactor and / or can comprise a final filter device. A discharge extruder can supply a constant volume flow of a processed plastic melt to a downstream spinning device or a downstream final filter device. A further homogenized melt can thus be provided particularly advantageously for the melt spinning of plastic fibers. By providing a discharge pump, the process pressure for melt spinning can be reliably ensured.

[0033] A further aspect of the present invention relates to the use of a device described above for producing synthetic threads from textile plastic waste, in particular for producing POY, FDY, BCF, PSF and / or IDY threads from textile plastic waste.

[0034] Yet another aspect of the present invention relates to a method for producing synthetic threads from recycled plastic waste, in particular using a device described above, in which textile plastic waste is pretreated in a pretreatment device, in which the pretreated plastic waste is melted into a plastic melt using a melting device, and in which synthetic threads are extruded from the produced plastic melt using a spinning device. The plastic waste is converted into a synthetic filament or fiber in a single-step process without intermediate products. No clumping, sticking, and / or melting occurs during compaction of the plastic waste. Compaction takes place well below the melting temperature of the respective plastic waste.

[0035] These steps according to the invention enable, in particular, the production of plastic fibers from recycled material containing textile plastics. Resource efficiency in the production of synthetic fibers can thus be improved with minimal effort.

[0036] A further independent aspect of the present invention relates to a device for recycling plastics, comprising a pretreatment device for pretreating textile plastic waste, in particular a pretreatment device as described above, a melting device for melting pretreated plastic waste into a plastic melt, in particular a melting device as described above, and a processing device for producing a product from a plastic melt produced by the melting device. According to the above statements, a processing device can be a spinning device for melt-spinning synthetic threads or other types of processing devices, in particular for producing other intermediate and / or end products.

[0037] According to an advantageous embodiment, the processing device can be designed as a final processing device for producing a final product and / or as an intermediate processing device for producing an intermediate product. An intermediate processing device can be followed by further processing devices, other devices for recycling plastics, or other processing machines.

[0038] According to a further embodiment, the processing device can be designed as a granulating device for producing plastic granules. Plastic granules can be advantageously used for further processing into a variety of different products.

[0039] The process for producing synthetic threads described above is particularly preferably a melt spinning process, in particular for producing melt spun threads from a plurality of filaments.

[0040] The preferred embodiments and advantages described above with regard to the device for producing synthetic threads from recycled plastic waste also apply in the same way to the method for producing synthetic threads and also with regard to the use of a device according to the invention described above.

[0041] The invention is described below by way of example with reference to the attached figure, which shows schematically:

[0042] Fig. 1 shows an apparatus for producing synthetic threads from recycled plastic waste according to an embodiment of the present invention.

[0043] Fig. 1 schematically shows an embodiment of a device 10 according to the invention for producing synthetic threads from recycled plastic waste.

[0044] The device 10 comprises a pretreatment device 12 with a comminution device 14, a pre-drying device 16, and a compaction device 18. The pre-drying device 16 is arranged downstream of the comminution device 14. The compaction device 18 is arranged downstream of the pre-drying device 16. The device 10 further comprises a melting device 20. The melting device 20 can be arranged downstream of the compaction device 18. The melting device 20 can be designed as a melting extruder. The melting device 20 can be single-screw or multi-screw and can be connected to a filter device 22 via an extruder outlet, wherein the melting device 20 optimally features vacuum-based degassing.

[0045] Downstream of the filter device 22 is a melt pump 24, which is driven by a pump drive 26. The melt pump 24 can convey a plastic melt in a suitable manner.

[0046] The melt pump 24 is connected to a degassing device 28. The degassing device 28 has a housing 30, which is formed, for example, by a cylindrical pot with a lid. A vacuum chamber can be formed within the housing 30, in which several filter elements (not shown in detail here) in the form of hollow cylindrical filter candles can be arranged. Such filter elements have a permeable filter wall and ensure further filtration of the plastic melt. The vacuum chamber in the housing 30 can be connected via a vacuum connection 31 to a collecting container (not shown here) and to a vacuum pump (also not shown in detail here).

[0047] The degassing device 28 can be coupled to a residence reactor 32. The degassing device 28 can be connected to the residence reactor 32 on an outlet side in a bottom region of the housing 30. A filtered and degassed plastic melt from the degassing device 28 can be fed directly to an inlet region of the residence reactor 32.

[0048] The residence reactor 32 can have a vacuum connection 34 on its outlet side. The vacuum connection 34 can be connected to a separate vacuum pump. A driven screw shaft 36 can be arranged within the residence reactor 32, which feeds the plastic melt to a reactor outlet 38. A discharge extruder 40 can be provided at the reactor outlet 38 to discharge the filtered and degassed plastic melt.

[0049] Downstream of the discharge extruder 40, a discharge pump 42 with pump drive 43 and further a final filter device 44 can be arranged.

[0050] The device 10 further comprises, as a final processing device, a spinning device 46 for extruding threads from a plastic melt produced by the melting device 20. The spinning device 46 can have a plurality of spinnerets 48 for extruding synthetic threads. The final filter device 44 can be arranged upstream of the spinning device 46.

[0051] In the embodiment shown in Fig. 1, the degassing and homogenization of the plastic melt can be further intensified by the residence reactor 32. Thus, additional gases released from the plastic melt can be removed via the vacuum connection 34. Such a device 10 with the residence reactor 34 shown is particularly suitable for directly processing the recycled plastic material into new synthetic threads.

[0052] During operation of the device 10, a material to be recycled, for example, waste plastic threads, can be fed to the pretreatment device 12, in particular to the comminution device 14 designed as a cutting mill. Therein, comminution takes place for further use of the material to be recycled. Cutting, separating, and / or grinding in the comminution device 14 produces a fine-grained bulk material, granulate, and / or powder that retains the molecular properties of the original material.

[0053] In a next step, the shredded recycled material is fed to the pre-drying device 16 and heated, which dehumidifies and homogenizes the granulate material. This achieves a homogenization of the moisture content within the material. Finally, in a further pre-treatment step, the dried recycled material is fed to the compaction device 18, designed as a screw compactor, and compressed, resulting in a compacted or pressed mass of recycled material that can be fed into the downstream melting device 20, designed here as a melting extruder.

[0054] The recycled material, which has been processed as described above, can be fed directly from the compaction device 18 to the melting unit 20, which is designed as a melting extruder. The melting extruder can preferably be designed without a vacuum unit. However, it can also be designed with a vacuum unit.

[0055] The melting unit 20 heats the recycled material at least to its melting point, thus generating a plastic melt that is fed via the extruder outlet to the downstream filter device 22. In the filter device 22, the plastic melt is first pre-filtered with a comparatively coarse filter mesh to remove foreign particles, such as residues of paints, varnishes, or stickers, as well as contaminants and unmelted particles of the recycled material from the plastic melt. The filtration of the plastic melt can take place in an overpressure atmosphere. The pre-filtered plastic melt is taken up by the melt pump 24 and fed to the degassing device 28 at an adjustable and, as far as possible, constant operating pressure.

[0056] The plastic melt enters a pressure chamber of the degassing device 28 via a melt inlet and passes through filter elements arranged there. To generate the vacuum in the vacuum chamber of the degassing device 28, a vacuum pump is provided, which is connected to the degassing device 28 via the vacuum connection 31.

[0057] The gases and evaporating components evaporating from the plastic melt due to the negative pressure atmosphere can be removed from the vacuum chamber of the degassing device 28 via the vacuum connection 31 and collected in a container not shown here. The plastic melt degassed in this way collects at the bottom of the housing and leaves the degassing device.

[0058] 28 via a melt outlet at the bottom of the housing 30.

[0059] From the melt outlet of the degassing device 28, the degassed and filtered plastic melt flows directly or indirectly into the discharge extruder 40. In the present embodiment, the residence reactor 32 is also provided between the degassing device 28 and the discharge extruder 40. In this respect, a filtered and degassed plastic melt from the degassing device 28 is fed to an inlet area of ​​the residence reactor 10 and passed through the reactor outlet 38 into the discharge extruder 40.

[0060] A device 10 according to the present invention enables, in a particularly advantageous manner, the recycling of textile plastic waste for the production of new synthetic threads. This allows for particularly resource-efficient production and ensures the recycling or recycling of textile plastic waste.

[0061] List of reference symbols

[0062] 10 Device for the production of synthetic threads

[0063] 12 Pretreatment facility

[0064] 14 Shredding device

[0065] 16 Pre-drying device

[0066] 18 Compaction device

[0067] 20 Melting device

[0068] 22 Filter device

[0069] 24 melt pump

[0070] 26 Melt pump drive

[0071] 28 Degassing device

[0072] 30 housings

[0073] 31 Vacuum connection

[0074] 32 Residence reactor

[0075] 34 Vacuum connection

[0076] 36 Worm shaft

[0077] 38 Reactor outlet

[0078] 40 discharge extruders

[0079] 42 discharge pump

[0080] 43 Pump drive

[0081] 44 Final filter device

[0082] 46 Spinning device

[0083] 48 spinnerets

Claims

Patent claims 1. Device (10) for producing synthetic threads from recycled plastic waste - with a pretreatment device (12) for the pretreatment of textile plastic waste, - with a melting device (20) for melting pretreated plastic waste to a plastic melt and - with a spinning device (46) for extruding threads from a plastic melt produced by the melting device (20).

2. Device (10) according to claim 1, characterized in that the pretreatment device (12) is arranged upstream of the melting device (20) and / or that the pretreatment device (12) is designed for the mechanical pretreatment of textile plastic waste and / or that the pretreatment device (12) is designed for the pretreatment of threads, yarns, materials, fabrics, films and / or textile sheet materials and / or textile plastic waste made of polyethylene terephthalate.

3. Device (10) according to claim 1 or 2, characterized in that the pretreatment device (12) has a plurality of treatment devices (14, 16, 18), in particular for carrying out several successive pretreatment steps for textile plastic waste.

4. Device (10) according to one of the preceding claims, characterized in that the pretreatment device (12) has at least one comminution device (14), in particular a cutting mill, for the mechanical comminution of textile plastic waste.

5. Device (10) according to one of the preceding claims, characterized in that the pretreatment device (12) has at least one pre-drying device (16) for pre-drying and / or equalizing the moisture content of textile plastic waste, in particular of shredded textile plastic waste, wherein the pre-drying device (16) is preferably arranged downstream of the shredding device (14).

6. Device (10) according to one of the preceding claims, characterized in that the pretreatment device (12) has at least one compaction device (18) for compacting textile plastic waste, in particular shredded and / or pre-dried textile plastic waste, wherein no melting of the textile plastic waste takes place during compaction, and / or wherein the compaction device (18) is preferably arranged downstream of the pre-drying device (16).

7. Device (10) according to claim 6, characterized in that the compacting device (18) is designed as a screw compressor and / or is arranged for the direct feeding of textile plastic waste into the melting device (20).

8. Device (10) according to one of the preceding claims, characterized in that the melting device (20) is designed as a melting extruder, in particular as a single- or multi-screw melting extruder and / or vacuum melting extruder.

9. Device (10) according to one of the preceding claims, characterized by at least one filter device (22) for filtering a plastic melt and / or for multi-stage filtering of a plastic melt and / or by at least one melt pump (24) for conveying a plastic melt, wherein the filter device (22) and / or the melt pump (24) is preferably arranged between the melting device (20) and the spinning device (46).

10. Device (10) according to one of the preceding claims, characterized by at least one degassing device (28) for degassing a plastic melt, wherein the degassing device (28) is preferably arranged between the The melting device (20) and the spinning device (46), in particular between the melt pump (24) and the spinning device (46), are arranged. Device (10) according to claim 10, characterized in that the degassing device (28) is designed for filtering and / or decontaminating a plastic melt and / or for degassing a plastic melt by means of a negative pressure, in particular a high vacuum of 1 to 50 mbar. Device (10) according to claim 10 or 11, characterized in that the degassing device (28) is designed to increase an intrinsic viscosity of the plastic melt of up to 0.15 dl / g and / or to homogenize the viscosity and / or to produce a spinnable plastic melt.Device (10) according to one of the preceding claims, characterized by a residence reactor (32) for receiving a pre-filtered and / or degassed plastic melt, wherein the residence reactor (32) preferably has a driven screw shaft (36) for conveying the plastic melt and / or is arranged downstream of the degassing device (28). Device (10) according to claim 13, characterized in that the residence reactor (10) is designed to increase the intrinsic viscosity of a received plastic melt and / or to produce a spinnable plastic melt and / or to increase the intrinsic viscosity to up to 1.1 dl / g.Device (10) according to one of the preceding claims, characterized by a discharge extruder (40) for discharging a plastic melt and / or by a discharge pump (42) for discharging a plastic melt to the spinning device (46), wherein the discharge extruder (40) and / or the discharge pump (42) is preferably arranged downstream of the degassing device (28) and / or the residence reactor (32) and / or a final filter device. (44) and / or a final filter device (44) is arranged downstream of the discharge extruder (40) and / or the discharge pump (42). Use of a device (10) according to one of the preceding claims for producing synthetic threads from textile plastic waste, in particular POY, FDY, BCF, PSF and / or IDY threads from textile plastic waste. Method for producing synthetic threads from recycled plastic waste, in particular with a device (10) according to one of the preceding claims 1 to 15, - in which textile plastic waste is pretreated in a pretreatment device (12), - in which the pretreated plastic waste is melted into a plastic melt using a melting device (20), and - in which synthetic threads are extruded from the plastic melt produced using a spinning device (46), the plastic waste being converted into a synthetic filament or fiber in a single-stage process without intermediate products.

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