DE10149515A1 - Producing plastic extrusions or moldings from cellulose-contaminated thermoplastic wastes, post-comminutes them in hammer mill and brushes off cellulosic particles - Google Patents

Abstract

Post-comminution of the plastic wastes takes place in a fluidizing hammer mill (11). Mixed cellulose-free and cellulose-contaminated plastic wastes are sent to a rotary brushed screen (15) which largely removes the cellulose components from the plastic particles by mechanical brushing. Only the purified plastic particles are subsequently supplied to the extruder or injection-molding equipment. Cellulosic components are removed using the brushed screen. They are conveyed pneumatically, together with cellulose-contaminated plastic particles into a cyclone, to be separated from the process air. Interlocking cellulose-free and cellulose-contaminated particles are cleared of dirt, fine dust and air in the cyclones (12, 13) between the mill and brushed screen. The plant also includes conventional equipment, e.g. a shredder, ferrous and non-ferrous metal separators and screening equipment. Independent claims are included for plant carrying out the process and the plastic sheet product. The latter is free of so-called comet-trails or particle-smearing defects, and includes very fine, evenly-distributed cellulose particles

Description

The invention relates to a method for producing a Plastic product made from recycled, with cellulose components contaminated plastic waste, after its pre-shredding and after removing the iron and non-iron components in one Post-shredding largely from the adherent Cellulose components freed and the so purified Plastic particles in an extruder or an injection molding device processed into a new plastic product.

According to a known by use, however processes of this type that are currently not verifiable in printed form with cellulose constituent plastic parts such. B. slides too Bales pressed after releasing the tying a shredder or fed into a cutting mill for comminution. After that, go through the pre-shredded cellulose Plastic parts each have a metal separator for iron and Non-ferrous metals and then a car wash that removes the cellulose washed down from the shredded plastic parts.

For the most part hereafter of cellulose components cleaned plastic parts are then left to a residual moisture from 2% to 3% thermally dried, which is particularly true for films is very expensive. The crushed and used to make one new plastic product to be used plastic parts on the one hand contain residual cellulose fractions of the highest different number and size, which cannot be determined, for other residues of glue used for labeling.

Especially these cellulose parts, but also the glue residues, lead to the melting of the plastic parts in the extruder an undesirable build-up of pressure on the melt filter and require in addition, a corresponding device on the extruder for the Degassing of the water vapor from the residual moisture of the cellulose components.

The non-melted cellulose parts and adhesive residues appear as in a film made from it, for example Specks of different sizes and also hinder the melt flow occurring in the extrusion process at the nozzle and then cause new material thinning in the speck area manufactured plastic film.

These material dilutions occur - in the direction of extrusion seen - e.g. B. here the production of films, behind the by the Cellulose components / adhesive residues caused blockages on the Nozzle as a "comet effect" in the form of a comet tail, reduce the strength of the film in these areas and leave the film appears unsightly and as inferior quality.

And finally it turns out with this known method the disposal or treatment of the washing water with its Remaining components as extremely costly.

Starting from this closest state of the art, is the object of the invention, a method of the beginning to create the type mentioned, with which is contaminated with cellulose Plastic waste, such as foils, plastic wallpapers, Tetra Paks as well plastic waste originating in the automotive supply industry without Water and separated with no higher energy expenditure with the aim of creating an undesirable pressure build-up either in the extruder or within an injection molded product the number and size is significantly reduced or avoided entirely of the residual cellulose content in the new plastic product Minimum dimension is reduced and none of the material strength or the Material thinning impairing material appearance occur.

This task is in connection with the above Generic term solved according to the invention in that the Post-shredding of plastic waste in an impact vortex mill and then the mixed cellulose-free and cellulosic plastic particles passed into a brush screen and there the cellulose components largely from the plastic particles mechanically brushed and then only the cleaned ones Plastic particles the extruder or the injection molding device be fed.

In the impact vortex mill, the adherent Pieces of cellulose, e.g. B. of labels and stickers, mechanically separated, the cellulose being defibrated into fine fibers. By electrostatic adhesive forces, due to trioelectric Charges, the cellulose fibers adhere strongly to the charged ones Plastic particles so that the cellulose fibers are separated by sieving or air sifting is not possible and therefore not largely fiber-free plastic product, such as. B. a film, can be manufactured. After that, they are together mixed cellulose-free and cellulosic plastic particles passed into a brush screen and there the cellulose components largely brushed mechanically from the plastic particles and then the detached cellulose parts excreted and only the cleaned plastic particles the extruder or the Injection molding device supplied. This process works completely dry, the brushing of the cellulose components in the Brush sieve cleaned in such a way that a plastic product made therefrom, e.g. B. a slide completely homogeneously distributed, extremely small specks with an almost round one Has shape and the film with a good appearance and with positive Product features is provided.

The cellulose components from the Brush screen removed and the cellulose-free as well as the one with Plastic particles containing cellulose pneumatically into a cyclone directed and freed from the process air there. After that it will Mixture of cellulose-free and cellulose-infested Plastic particles using an electrostatic Cellulose separation into a cellulose-free plastic particle fraction and in a cellulosic residual plastic particle fraction Cut. All of these process steps are carried out dry, see above that what is involved in the prior art, extremely expensive Wash water as well as the relatively large cellulose Remaining components of completely uneven shape in one Plastic product in the form of e.g. B. a new plastic film.

After a particularly advantageous development of Invention is the cellulose-containing plastic particle residual fraction fed back into the material flow before the secondary shredding and reprocessed in this way. This will drop the waste on the Cellulose limited and therefore kept small in cost.

To produce a quality Plastic product, only the cellulose-free plastic particle Fraction fed to the extruder or the injection molding device. This plastic particle fraction still contains little, but not Removable residual particles of cellulose, which, however, neither Extrusion process still the plastic product made from it affect. Particularly noteworthy is the brush sieve, which contains at least 80% of the cellulose components from the Separates plastic particles.

After the shredding, the shredded claws Components of cellulose-free and cellulose-infested Plastic particles with each other and are elegant with the brush screen not only from each other, but also the cellulosic plastic particles from this cellulose Brushing separated. But before they clenched together cellulosic and cellulosic plastic particles in the Brush sieve, they will be in a between the Impact vortex mill and the cyclone from Dirt, fine dust and air separated.

In terms of the device, the invention is based on one According to the current state of the art, which cannot be documented in writing at the moment a device for performing the method with a Pre-shredding the plastic waste to be recycled with a Shredder, a cutting mill or the like., The one Iron separators and a non-iron separator are arranged downstream and the latter a separation device for separating the cellulose from is subordinate to the film components. According to the State of the art the downstream separation device from a Car wash with all the disadvantages already described.

Starting from such a device, the In terms of the device, the object underlying the invention solved that the separation device of an impact vortex mill, a Cyclone and formed by a brush sieve arranged after it is. By combining the impact vortex mill, the cyclone and the brush screen is surprisingly all in one dry process a quality of the greatest possible degree from the Cellulose particles liberate plastic particles for renewed use Extrusion or re-injection molding created with the previous ones known devices neither possible nor within reach is back.

The impact vortex mill advantageously has several one above the other arranged, attached to a common drive shaft Grinding stages that are encompassed by a cylindrical housing are, each grinding stage with a for weight reduction Openings provided mounting plate and attached with a A plurality of circumferentially arranged knives is provided between the Knives and the housing inner wall a conveying gap for the regrind is formed from grinding stage to grinding stage, an inlet channel at the inlet arranged for the grinding air and the outlet with negative pressure is connected to the downstream cyclone. such Impact vortex mills are in their mechanical structure, for. B. from the DE 35 43 370 A1, DE 295 15 434 U1 and DE 197 15 772 C1, known. However, it is not known that the Outlet for the regrind - in the form of the shredded Plastic particles - using a vacuum with a cyclone connected is. The subject of DE 197 15 772 C1 teaches one Overpressure to a storage space, which in the present case for both the method, the device according to the invention and also for the plastic product manufactured with it would be harmful.

The brush screen advantageously consists of a rotary Brush screen or from a flat brush screen.

After a particularly advantageous development of Invention consists of the brush screen in the form of a rotary Brush screen made of several, attached to arms on a shaft Brushes with their elastic bristles on the inner surface of a sweep along cylindrical sieve drum, the brushed cellulose components and those still with cellulose contaminated plastic particles at a first outlet at the end of the Sieve drum and the brushed cellulose at a second outlet can be removed below the drum. The mesh size of the Sieve area of the sieve drum is from 1 mm to 2.5 mm.

To be so largely from the small dust or fibrous cellulose components liberate plastic particles still further from them due to electrostatic, adhesive or other cellulose residues adhering to forces and the mechanically not fully digested plastic Freeing cellulose composites is at the outlet of the brush screen Cyclone for electrostatic charging and this one Vibrating trough to equalize the material flow downstream electrostatic cellulose separation device. In this - known per se - electrostatic cellulose separation Device are already detached from the plastic particles Cellulose components removed.

After a particularly advantageous development of Invention is the outlet for the cellulosic plastic particle Residual fraction at the electrostatic cellulose separation Facility with the entrance of the impact vortex mill or with it Connected feeders, which minimizes the amount of waste

The outlet for the cellulose-free plastic particle fraction electrostatic cellulose separation is either with a Container or with a direct conveyor to one Extruder or an injection molding device connected. Here is the Expression "cellulose-free plastic particle fraction" interpret that the plastic particles contained therein except for maximum 3% of the originally adherent Cellulose components are exempt and an additional one Separation from mechanical engineering expenses and thus associated cost reasons is not responsible. The The degree of purity of the cellulose-free plastic particle fraction "is therefore at least 97%.

To the advantageous mode of operation of the method clarify, was with him and with the help of the above Device made of a plastic product in the form of a plastic film recycled as well as plastic particles in the form of film snippets shredded plastic films made with cellulose components are afflicted. This is a plastic product characterized in that the plastic film free of comet tails is completely evenly provided with very small cellulose particles.

With such a plastic film up to a maximum thickness of 50 µm the individual specks are rounded and due to their Fineness integrated into the film material considerably better than with State of the art, so that the extrusion direction is not immediately is recognizable. This is because the material thinning in Speck area is so small that it is visible to the human eye is hardly noticeable anymore and that in the state of the art there is no inevitable comet effect.

Such a film ensures puncture resistance, which almost corresponds to a film made of new plastic material.

The concentration of cellulose particles within the Plastic film is a maximum of 3%. As plastics come to Foil production polyethylene, polyurethane, polyamide, polypropylene or polyethylene terephthalate in question.

A method of manufacturing the devices for Production and an inventive plastic product in the form a film are shown in the drawings. Show:

Fig. 1 shows the material flow of the plastic fraction with adhering cellulosic components to the cellulose-free plastic particle fraction in a flow chart with symbolic device and lighting equipment in accordance with DIN 28004,

Figs. 2 and 3, the pictorial juxtaposition of the individual devices and means in accordance with Fig. 1,

Fig. 4 shows the side view and

Fig. 5 is a sectional view taken along the line VV of Fig. 4 by an impact turbulence mill,

Fig. 6 is a schematic longitudinal sectional view through a rotary Bürstensieb,

Fig. 7 is a sectional view taken along the line VII-VII of Fig. 6,

Fig. 8 is a schematic representation of a blown plastic film according to the inventive method with the inventive devices and

Fig. 9 is a schematic representation of a blown plastic film, the components of which have been subjected to wet washing after the re-crushing according to the prior art.

Before the structural details of the device parts according to FIGS. 2 to 7 are discussed, the description of the method according to the invention is given on the basis of the flow chart representation of FIG. 1:

In the system 1 of FIG. 1, the z. B. cellulose labels plastic fraction, which can be delivered for example in the form of a compressed bale, dissolved and in a shredding device 2 , such as. B. a rotor shear, a shredder or a cutting mill according to the prior art, subjected to a pre-shredding. The pre-shredded material is fed to an iron separator 4 via a belt conveyor 3 . The iron components are transported into the container 5 , and the plastic parts with cellulose components are fed via a vibrating trough 6 to a metal separator 7 for non-ferrous metals. The non-ferrous metals are then discharged via a conveyor 8 into a container 9 and the pre-shredded plastic parts with cellulose components are fed to a separating device via a further conveyor 10 . Up to this process step, the process according to the invention corresponds to the known prior art, in which the separating device consists of a wet wash.

In contrast, in the method according to the invention, the secondary comminution and separation takes place by means of an impact vortex mill 11 in connection with a cyclone 12 , 13 and a brush screen 15 as follows:

In the impact vortex mill 11 , which will be described in detail later, the pre-comminuted plastic parts, which are contaminated with cellulose, are re-comminuted in several grinding stages to a size of 1 mm to 10 mm, as a result of which the actual material digestion of cellulose-containing and cellulose-free plastic particles takes place. This mixed fraction is pneumatically fed to a large cyclone 12 and then to a smaller cyclone 13 , in which the intermeshed cellulose-free and cellulosic plastic particles are separated from dirt, fine dust and air. The process air is passed via a fan 14 to a filter, not shown. From the cyclones 12 , 13 the clawed plastic particles, now cleaned of dirt, fine dust and air, pass into a brush screen 15 in the form of a rotary brush screen, in which the cellulose-free plastic particles and the latter between 80% and 90% of the cellulose be separated. The pure cellulose is drawn off via one or more conveyors 16 , 17 into a container 18 , whereas the plastic particles, which have been cleaned of at least 80% of cellulose, are discharged into a cyclone 19 for electrostatic charging via a conveyor path 20 and pneumatically passed on. The process air is discharged from the cyclone 19 via a further fan 21 to a filter, not shown.

Before the at least 80% of the plastic particles freed from the cellulose constituents reach the electrostatic cellulose separation device 23 via a vibrating trough 22 , the plastic particles in the cyclone 19 and in the conveying path 20 are charged electrostatically.

The vibrating trough 22 or a similar device with the same function serves to homogenize the material flow to the electrostatic cellulose separation device 23 .

A material stream flows into the latter, which consists of 80% to 90% of plastic particles freed from cellulose and only 10% to 20% of plastic particles with cellulose. These constituents from the mixed fraction are further separated from one another in the electrostatic cellulose separation device 23 .

The plastic particles still contaminated with cellulose arrive at the exit 23 a via a conveyor 24 back to the conveyor 10 before re-comminution in the form of the special impact vortex mill 11 or directly into the latter 11 in order to be subjected to a new material digestion in the latter.

The cellulose-free plastic particles, on the other hand, go via a further outlet 23 b and the conveyor 25 from the electrostatic cellulose separation device 23 either into a container 26 for further transport into an extruder (not shown) or an injection molding device or directly via the conveyor 25 and an oscillating channel (not shown) a downstream extruder, also not shown, or an injection molding device.

In FIGS. 2 and 3, the parts are to be connected by Aneinanderlegung the two figures directly with each other, the flow chart show in Fig. 1 corresponding devices and devices for carrying out the method described above. 1 thereby matching parts with FIG. Designated by like reference numerals. According to FIG. 2, the bales made of plastic material, such as foils, wallpaper, Tetra Paks or other plastics that are contaminated with cellulose, are pre-shredded in the shredding device 2 . The pre-shredded plastic parts go via the conveyor 3 into the iron separator 4 , from there the iron components into the container 5 and the further mixture via a vibrating channel 6 into the non-iron separator 7 , from which the non-ferrous metals into the container 9 and the plastic now cleaned from the metals - Fraction on the conveyor 10 for secondary comminution in the impact vortex mill 11 to be described with reference to FIGS . 4 and 5 are transported.

Via the line ends 11 a, 11 b to be connected, the mixed plastic particle fraction of cellulose-free plastic particles and cellulose-containing plastic particles with a particle size of 1 mm to 10 mm, which are clawed together, reaches the rotary brush screen 15 via the cyclone 12 and the downstream cyclone 13 .

In this brush screen 15 , not only are the cellulose-free plastic particles separated from the cellulosic plastic particles, but also 80% to 90% of the cellulose components are brushed off from the latter, so that 15 plastic particles are present at the output 50 of the brush screen, which only contain a residual proportion below 20% of cellulose components ,

In the cyclone 19, these plastic particles are electrostatically charged before they reach over the vibrating channel 22 in the electrostatic separation device 23 and there be separated into the cellulose-containing residual fraction, the cellulose-free fraction, and. The cellulose-containing residual fraction returns to the impact vortex mill 11 via the conveyor 24 , and the cellulose-free fraction is fed either via a container 26 (see FIG. 1) or directly to an extruder (not shown).

In Figs. 4 and 5, the impact turbulence mill 11 is illustrated. The drive shaft 27 of this impact vortex mill 11 is driven by a powerful electric motor 28 from e.g. B. 300 kW via the motor output shaft 29 and several toothed belts, not shown, to the drive wheel 30 of the impact vortex mill 11 . A plurality of grinding stages 31-34 , which are separated from one another by disk-shaped walls 35 and are encompassed by a cylindrical housing 36, are arranged on the drive shaft 27 .

Each grinding stage 31-34 is attached to a receiving plate 38 provided with openings 37 for weight reduction. Furthermore, each grinding stage is provided with a plurality of knives 39 arranged on the circumference. A conveying gap s is formed between the knives 39 and the inner wall 36 a of the housing 36 , between which the ground material is conveyed from the inlet 40 to the outlet 41 . Depending on the material, this conveying gap s can narrow from the grinding stage 31 to the grinding stage 34 . Furthermore, the number of grinding stages 31-34 can be expanded or reduced by further grinding stages. Due to the constant smashing and beating against each other at high speeds, be it between the knives 39 and the housing inner wall 36 a or the film parts and film particles with one another, such an effective material comminution from 1 mm to 10 mm takes place with a material digestion in which the cellulose-free with the cellulosic plastic particles chaotic, e.g. B. in snippet form, claw together. This mixture passes from the outlet 41 via the two cyclones 12 , 13 into the brush screen 15 .

This brush screen 15 is shown in FIGS. 6 and 7. The mixture consisting of cellulose-free and cellulosic plastic particles passes into the interior 43 of the brush screen 15 via the inlet 42 . This Bürstensieb 15 consists essentially of a driven by a motor 45 shaft 44, on which a plurality of the brush 47 bearing arms are fixed 46, the bristles 48 on the inner wall 49 a of the cylindrical screen drum 49 along sweep and thereby affected cellulose components of the with cellulose Plastic particles, e.g. B. from film snippets, brush off. The brush screen to be used is designed so that the product to be cleaned is conveyed from the inlet 42 to the outlet 50 .

At the outlet 50 passes this, only 10% to 20% of the original content of cellulose-prone Kunststoffpartikel- cellulosic mixture of cellulose-free and cellulose prone plastic particles to the cyclone 19, whereas, on the other, with the upstream, funnel-shaped wall portions 53 a provided outlet 53 of the Cellulose fraction removed and fed to the container 18 via the two conveyors 16 , 17 (see FIGS. 1 and 3).

Dust is removed from the brush screen 15 via the pipe channel 54 . In the sectional view of FIG. 7, parts that correspond to FIG. 6 are identified by the same reference numerals, so that this figure is self-explanatory.

As already mentioned above, the cellulose-free plastic particle fraction collected in the container 26 is removed from the electrostatic cellulose separation device 23 by the conveyor 25 and then z. B. blown a new plastic film in an extruder. Since the entire process and the devices used for this work dry, there is no need for the wet washing required in the prior art, and the subsequent drying inevitably. The result is surprisingly a plastic product in the form of a plastic film according to FIG. 8. The expression "cellulose-free plastic particle fraction" in the container 26 is to be understood to mean that it is plastic particles, here in the form of film snippets, with a size of 1 mm to 10 mm, which only contain a minimal percentage of 3% of cellulose components. However, these cellulose components are so microscopic that their removal would be out of proportion to the costs involved.

As can be seen from FIG. 8, these residual cellulose constituents 55 are distributed completely homogeneously, and the non-melted plastic particles 55 a are distributed over the surface 56 of the film 57 with a speck size that is barely perceptible to the eye.

In contrast, a blown film 58 according to the prior art has cellulose constituents 59 , 60 of completely different sizes as well as unmelted plastic particles 59 a, 60 a, which are completely inhomogeneously distributed over the surface 61 of film 58 and have cometary tails 59 b, 60 b, in the areas of which the film thickness and thus also its puncture resistance are significantly reduced and on the basis of which the direction of extrusion according to arrow 62 can be recognized.

Due to the relatively large cellulose constituents 59 , the puncture resistance of the film 58 is reduced considerably at precisely these points and the areas of the comet tail 59 b, 60 b. In addition, these relatively large cellulose constituents 59 and their moisture build up a counterpressure in parts of the nozzle or blockages occur and the film tears. In any case there are production disruptions. Such a film 58 also looks unsightly optically.

In contrast, the completely homogeneous film 57 produced according to the method of the invention according to FIG. 9 with a thickness of only 40 μm has a speck size of the rounded specks 55 , 55 a which is barely perceptible to the human eye. Reference list 1 Appendix
2 shredding device
3 belt conveyors
4 iron separators
5 , 9 , 18 , 26 containers
6 , 22 vibrating channel
7 metal separators
8 , 10 , 16 , 17 , 24 , 25 conveyors
11 impact vortex mill
11 a; 11 b cable ends
12 , 13 , 19 cyclones
20 conveyor line
14 , 21 fans
15 brush screen
23 Cellulose separation device
23 a, 23 b outputs of the cellulose separation device 23
27 drive shaft
28 electric motor
29 , 44 wave
30 drive wheel
31-34 grinding levels
35 partitions
36 housing
36 a housing inner wall
37 openings
38 mounting plate
39 knives
40 , 42 inlet
41 , 53 outlet
43 interior of the screening drum 49
45 engine
46 arms
47 brushes
48 bristles
49 sieve drum
49 a inner surface of the drum 49
50 Output of the brush screen 15
51 pouring cone
52 surface of the pouring cone 51
53 a funnel-shaped wall areas from the outlet 53
54 pipe channel
55 , 59 , 60 cellulose components
55 a, 59 a, 60 a unmelted plastic particles
59 b, 60 b comet tail
56 area of the film 57
57 , 58 slides
61 area of the film 58
62 Direction of extrusion
s conveyor gap

Claims (22)

1. A process for the production of a plastic product from recycled plastic waste containing cellulose components, which after its pre-comminution and after the removal of the iron and non-iron components in a secondary comminution largely removes the adhering cellulose components and the cleaned plastic particles in an extruder or an injection molding device new plastic product are processed, characterized in that the secondary comminution of the plastic waste takes place in an impact vortex mill ( 11 ) and then the mixed cellulose-free and cellulosic plastic particles are passed into a brush sieve ( 15 ), where the cellulose components are largely mechanically brushed off from the plastic particles and then only cleaned plastic particles are fed to the extruder or the injection molding device. 2. The method according to claim 1, characterized in that the cellulose constituents are removed from the brush screen ( 15 ) and the cellulose-free and the cellulose-containing plastic particles are pneumatically passed into a cyclone ( 19 ) and are freed from the process air there. 3. The method according to claim 1 or 2, characterized in that the mixture of cellulose-free and cellulosic plastic particles by means of an electrostatic cellulose separation ( 23 ) is separated into a cellulose-free plastic particle fraction and in a cellulosic plastic particle residual fraction. 4. The method according to any one of claims 1 to 3, characterized in that the cellulose-containing plastic particle residual fraction in the material stream before the secondary comminution ( 11 ) is returned. 5. The method according to any one of claims 1 to 4, characterized characterized that only the cellulose-free Plastic particle fraction the extruder or the Injection molding device is supplied. 6. The method according to any one of claims 1 to 5, characterized in that the plastic particles in the impact vortex mill ( 11 ) are shredded to a size between 1 mm to 10 mm. 7. The method according to any one of claims 1 to 6, characterized in that the brush screen ( 15 ) separates at least 80% of the cellulose components from the plastic particles. 8. The method according to any one of claims 1 to 7, characterized in that the interlocked cellulose-free and cellulose-afflicted plastic particles are separated from dirt, fine dust and air in a cyclone ( 12 , 13 ) arranged between the impact vortex mill ( 11 ) and the brush screen ( 15 ) become. 9. An apparatus for performing the method with a pre-shredding of the plastic waste to be recycled, with a shredder, a cutting mill or the like., A downstream iron separator and a non-iron separator and a latter downstream separation device for separating the cellulose from the pre-shredded plastic waste according to one of claims 1 to 8, characterized in that this separating device is formed by an impact vortex mill ( 11 ), a cyclone ( 12 , 13 ) and a brush screen ( 15 ) arranged downstream of this. 10. The device according to claim 9, characterized in that the impact vortex mill ( 11 ) has a plurality of superposed, on a common drive shaft ( 27 ) attached grinding stages ( 31-34 ) which are encompassed by a cylindrical housing ( 36 ), each grinding stage ( 31-34 ) is attached to a mounting plate ( 38 ) provided with openings ( 37 ) for weight reduction and is provided with a plurality of knives ( 39 ) arranged on the circumference, between the knives ( 39 ) and the housing inner wall ( 36 a) a conveying gap ( s) is formed for the regrind from grinding stage ( 31 ) to grinding stage ( 34 ), an inlet channel for the grinding air is arranged at the inlet ( 40 ) and the outlet ( 41 ) is connected to the downstream cyclone ( 12 , 13 ) by means of negative pressure. 11. The device according to claim 9 or 10, characterized in that the brush screen ( 15 ) consists of a rotary brush screen or a flat brush screen. 12. Device according to one of claims 9 to 11, characterized in that the brush screen ( 15 ) consists of several, on arms ( 46 ) on a shaft ( 43 ) attached brushes ( 47 ) with their elastic bristles ( 48 ) Brush the inner surface ( 49 a) of a cylindrical sieve drum ( 49 ), the brushed cellulose components and the plastic particles still containing cellulose at a first outlet ( 50 ) at the end of the sieve drum ( 49 ) and the brushed cellulose at a second outlet ( 53 ) can be removed below the sieve drum ( 49 ). 13. Device according to one of claims 9 to 12, characterized in that the mesh size of the drum ( 49 ) of the brush screen ( 15 ) in the processing of plastic particles from a plastic film is 1 mm to 2.5 mm. 14. Device according to one of claims 9 to 13, characterized in that between the brush sieve ( 15 ) and the electrostatic cellulose separation device ( 23 ) after the cyclone ( 19 ) and a conveyor section ( 20 ) has a vibrating channel ( 22 ) to even out the Material flow to the electrostatic cellulose separation device ( 23 ) are arranged. 15. The device according to one of claims 9 to 14, characterized in that the outlet ( 23 a) for the cellulose-containing plastic particle residual fraction on the electrostatic cellulose separation device ( 23 ) with the input ( 40 ) of the impact vortex mill ( 11 ) or with it Feed conveyor ( 10 ) is connected. 16. The device according to one of claims 9 to 15, characterized in that the outlet ( 23 b) for the cellulose-free plastic particle fraction on the electrostatic cellulose separation device ( 23 ) with a container ( 26 ) or with a conveyor to an extruder or an injection molding device is connected. 17. Plastic product in the form of a plastic film made from recycled plastic films which have been comminuted to plastic particles in the form of film snippets and which contain cellulose constituents, characterized in that the plastic film ( 57 b, 60 b) free from comet tails ( 59 b, 60 b) is completely evenly provided with very small cellulose particles ( 55 ). 18. Plastic product according to claim 17, characterized in that the shape of the specks of the cellulose particles ( 55 ) enclosed in the plastic film ( 57 ) is rounded. 19. Plastic product according to claim 17 or 18, characterized in that the concentration of the cellulose particles ( 55 ) within the plastic film ( 57 ) is a maximum of 3%. 20. Plastic product according to one of claims 17 to 19, characterized in that the plastic film ( 57 ) is provided with a maximum thickness of up to 50 microns. 21. Plastic product according to one of claims 17 to 20, characterized in that the plastic film ( 57 ) consists of polyethylene (PE), polyurethane (PU), polyamide (PA), polypropylene (PP) or polyethylene terephthalate (PEPT). 22. Plastic product according to one of claims 17 to 21, characterized in that the particle size of the cellulose components ( 55 ) within the plastic film ( 57 ) is barely perceptible to the eye.