WO1988000098A1

WO1988000098A1 - Process and device for separating a specific material component from a conglomerate, especially from domestic garbage

Info

Publication number: WO1988000098A1
Application number: PCT/EP1987/000341
Authority: WO
Inventors: Ute Thimm-Dorner; Jörg DORNER
Original assignee: Thimm Dorner Ute; Dorner Joerg
Priority date: 1986-06-25
Filing date: 1987-06-25
Publication date: 1988-01-14

Abstract

Plastic parts which, because of the temperature of metal surfaces placed in contact with them, become adhesive to said surfaces and become welded thereto, can be separated from a flow of conglomerate, especially from a conglomerate of comminuted domestic garbage. Heated separation surfaces, after intimate contact with the conglomerate flow, are withdrawn from this flow, thereby entraining the plastic parts which adhere thereto. After this, the heated metal suraces are scraped off. Preferably the heated surface regions are provided on the inside of an obliquely-arranged rotary drum (24) into which the conglomerate flow (5) is fed.

Description

Method and device for separating a certain material component from a mixture, in particular from household waste.

The invention relates to a method and a device for separating out a certain material component from a mixture, in particular from household waste, physical conditions being created in a separating station, to which the material component in question selectively responds.

For example, from Swiss patent specification 557 699 it is known to provide a drum sorter working with air for separating solid waste in heavy and light waste, the drum, the axis of which is inclined to the horizontal and the lower and upper ends of which are open , a device for filling the mixed solid waste into the central region of the drum, a device for generating an air flow running longitudinally through the drum and a device for rotating the drum about its axis and the heavy waste towards the lower one End piece of the drum to move, while the air flow carries the light waste towards the upper end piece of the drum. In this way, paper and light materials, which according to the information in the cited document make up about three quarters of the waste, are separated from the heavy materials in such a way that subsequently used crushing machines for the light materials are orders of magnitude cheaper and more effective and an economic reuse of the separated material components is also possible. Similar wind classifier rotary drums of the aforementioned basic structure are also known from US Pat. No. 1,581,240 and British Pat. No. 289,306.

As is generally known, magnetically active parts have hitherto been eliminated from a batch flow, for example from a stream of comminuted household waste, by means of a magnet arrangement, which can have the shape of a magnetic drum adjacent to the batch flow, in that, owing to the magnetics Attraction which acted on the magnetically active material particles and which was given a different trajectory on a falling path than the magnetically inactive material particles, as a result of which the magnetically active material particles were conducted, for example above a separating edge, into a separate conveying channel, while the magnetically inactive ones Material particles below this separating edge fell into the opening of another material transport channel.

Finally, it is known from German Offenlegungsschrift 2,059,166 to separate electrically conductive or semiconducting material particles from electrically non-conductive material particles by moving a batch flow containing the material particles of both types by strongly inhomogeneous magnetic fields which are in the electrically conductive or semiconducting material particles induced currents, which came into electrical interaction with the magnetic fields in such a way that the electrically conductive the or semiconducting material particles took a different path of motion from the electrically non-conductive material particles and could be separated.

However, the known methods and devices described briefly above do not allow material components to be separated from a batch or batch stream which, compared to the other material components of this batch stream, have neither different electrical nor different magnetic nor different properties relating to weight or mass .

This is particularly disadvantageous in the classification of household waste, since, as already indicated above, the proportion of paper and plastics (the latter in the form of comparatively thin-walled parts as foils, bags, containers or light foam parts) in household waste is extraordinarily high and due to the comparable density and comparable aerodynamic shape of cardboard particles, corrugated cardboard particles, plastic parts and foam parts, these emerge together in wind sifter rotary drums as light components of the batch flow on one drum side.

If the separated light household waste components are removed by incineration, paper and cardboard, wooden parts and the like contribute considerably less to an environmental impact, which can be reduced to a tolerable level by filtering and washing the flue gases. Unfortunately, combustion of the plastics produces combustion gases and, after condensation of the water vapor contained in the flue gases, also acids which represent a heavy burden on the environment and moreover require special measures in order to incinerate waste plants against the aggressiveness of the plastics to make conditional smoke gases and acids resistant. Therefore, by the invention, the object is to be solved, a method for screening a particular Materialkompo¬ component of a mixture, in particular of domestic waste, in which in ^"a separating station physical conditions are ge provide, to which the concerned Materialkomponen¬ te selectively responsive, To be designed in such a way that plastic parts can be selectively separated from the batch flow to a higher percentage than was previously possible. The invention also aims to provide a device for carrying out such a method.

The above-mentioned object is achieved according to the invention in that the mixture is brought into contact with heated separating surface areas, parts made of plastic, in particular thermoplastic plastic, which are melted due to the temperature of the separating surface areas and due to the material of the separating surface areas , the separating surface areas are then moved together with the plastic parts adhering to them from the batch by relative movement between the batch and dividing surface areas, and the plastic parts are finally removed from the separating surface areas.

Most thermoplastic materials already begin to adhere to metal surfaces as separating surface areas at comparatively low temperatures above 100 ° C. and are carried out of such metal surfaces by the latter when the relative movement between the batch and the separating surface regions is carried out by the latter without that for the heating of the separating surface areas an energy would have to be used which would be necessary to melt a larger plastic volume, so that the energy requirement of the method or the corresponding device specified here is relatively low.

A series connection of several devices Carrying out the method specified here not only permits an improvement in the separation result, but also, with appropriate regulation of the temperatures of the individual interface areas from device to device, in each case to different values, makes it possible to select between different plastics, each with a different melting point.

Advantageous refinements of the method specified here and of devices for carrying out this method are characterized in the claims subordinate to claim 1, the content of which is hereby expressly made part of the description without repeating the wording in detail at this point. The advantages resulting from the further refinements and developments of the method and the devices are mentioned in the following description of exemplary embodiments, which are now explained in detail with reference to the drawing. The following represent:

1 shows a schematic side view, partly in section, of a first embodiment of a device for separating out a specific material component from a batch flow,

2 shows a schematic side view, partly in section, of an embodiment modified compared to FIG. 1,

Fig. 3 is a schematic, drawn in section

Side view of part of a classification device in a further development compared to FIG. 1,

4 shows a schematic perspective view of a device of the drum type for separating a specific material component from a batch flow, 5 shows a schematic sectional side view of the sorting rotary drum of the device according to FIGS. 4 and

6 is a schematic sectional side view of a modified embodiment of the sorting rotary drum for a device of the general type shown in FIG. 4, and finally

7 shows a partial sectional view of a detail of rotary sorting drums according to FIGS. 4 to 6.

The device according to FIG. 1 contains a belt conveyor 3 placed over two rollers 1 and 2, which can be driven in the direction of arrow P by means of a drive (not shown in FIG. 1). In a known manner, a series of rollers can serve to support the upper run of the belt conveyor 3. A batch flow 5 of household waste can be applied to the belt conveyor 3 by means of an input hopper 4, which is discharged by vehicles 6 from a ramp 7 into the input hopper 4.

To carry out the method specified here, it may be expedient to subject the household waste to a rough crushing before input into the funnel 4 in order to separate the parts of the material to be separated from one another without shredding the waste being absolutely necessary. The coarse comminution or separation can also be done by throwing the garbage in the delivery state from a greater height onto a coarse grate or onto wipeable obstacles before the garbage reaches the feed hopper 4. However, those skilled in the art will provide details in this regard, depending on the type of batch flow to be processed, so that various measures can be carried out before entering the batch into the input funnel 4 as desired, depending on whether the batch is household waste, Industrial waste or the like.

In the longitudinal conveying direction of the belt conveyor 3 downstream, a heating roller 8 makes contact with the upper run of the belt conveyor, which can be driven counterclockwise by suitable drive means with reference to the illustration in FIG. 1 and whose peripheral speed corresponds to the conveying speed of the belt conveyor. The roller 8 is hollow and, as indicated schematically in FIG. 1, contains a heating device 9, which is indicated via a feed line and a discharge line, schematically indicated at 10 in FIG. 1, and a heat via a hollow shaft 11 of the roller ¬ exchange medium is supplied from a heating source in order to heat the inner wall of the roller 8 so that the roller outer surface has a temperature at least in the peripheral region in which it makes contact with the batch flow 5 during the rotation of the roller, which is sufficient for this melt the thermoplastic plastic parts of the batch flow 5 coming into contact with the surface of the roll so that these plastic parts stick to the outer surface of the roll.

If the heated surface areas of the outside of the roll then rotate out of the contact area with the batch flow 5 during the rotation of the roll 8, the plastic ropes adhering to the roll outer surface are lifted out of the batch flow 5 and conveyed up on the roll circumference. Corresponding plastic parts are designated by 12 in FIG.

The adhesive effect between the melted plastic parts 12 and the metal outer surface, for example the steel surface of the roll shell, can be increased by providing a cooling device 13 downstream of the contact area with the batch flow 5 in the direction of roll rotation, which is provided via a line system 14 is supplied with a heat exchange medium in a similar manner to the heating device 9 becomes. The cooling device 13 causes the melted plastic of the plastic parts to solidify after they have been lifted out of the batch flow 5.

It should be expressly noted here that the heating device 9 and the cooling device 13 are only shown schematically in FIG. 1, and the person skilled in the art will recognize that if the wall thickness of the roll shell causes sufficient mechanical strength of the roll 8, heating or cooling the outer surface of the roller by heat conduction alone does not in all cases enable the device to operate at a satisfactory speed. In such cases, according to a modified embodiment, the heating device 9 is designed as a burner arrangement, the burner flames of which act directly on the inner wall of the roller. Such a burner arrangement can also act directly on the outer surface of the roll upstream of the contact area with the batch flow 5 with respect to the direction of rotation of the roll. However, it should be noted that the energy to be supplied to the roll shell to achieve a satisfactory separation result is comparatively low, since on the one hand the plastic parts to be separated can be melted on the surface even at comparatively low temperatures of generally over 100 ° C. and the heat capacity of the roller shell can be chosen to be low, since, due to the low mechanical forces which act on the roller shell, in particular when the roller 8 is elastically supported, small wall thicknesses of the roller shell and good heat-conducting materials can be provided to form the roller shell.

With respect to the direction of rotation of the roller behind the roller apex, there is a doctor blade 15 with a cutting edge which is essentially parallel to the roller axis and lies against the outer circumference of the roller. The doctor blade 15 can be coupled to an ultrasound generator 15a. The doctor knife 15 lifts the adhesive on the outer circumference of the roller 8 and adhesive plastic parts from the circumference of the roller during the rotation of the roller and drops the plastic parts, which can sometimes also adhere to one another, onto a conveyor 16 which conveys plastic parts in a direction approximately parallel to the roller axis, so that the plastic is separated from the other components of the Batch stream 5 can be deposited or reused,

The portion of the batch flow 5 which is separate from the plastic parts is thrown off the belt conveyor 3, for example into a vehicle 6 'which delivers the household waste cleaned of plastic components to a waste incineration plant. The waste incineration plant can of course also be connected directly downstream of the belt conveyor 3. This will be discussed in more detail below in the explanation of FIG. 4.

The separating result which can be achieved with the device according to FIG. 1 can be improved by connecting in series a plurality of heated rollers 8 each correspondingly constructed, it being possible for the batch stream 5 to be circulated or mixed between the individual stations. If the rollers 8 connected in series or arranged in cascade are adjusted to different temperatures on their outer circumference, it is possible to separate out different plastics by increasing the temperature from roller to roller.

So that plastic residues, which are not lifted from the roller circumference by the doctor blade 15, do not form an adhesive layer on the roller circumference before contacting the batch flow 5, the roller circumference can be cleaned by a cleaning device 17 which, with respect to the direction of rotation of the roller, defines the contact area with the Batch flow 5 is connected upstream, additionally cleaned. For this purpose, the cleaning device 15 by means of a Burner arrangement flames the outer surface of the roller so that plastic residues of small volume burn off and afterwards any remaining residues, as is not shown in FIG. 1, can be brushed off. As previously indicated, a heating device acting on the outer surface of the roller can also take over the function of the cleaning station at the same time.

While in the embodiment according to FIG. 1 the heated or heatable separating surface areas are formed by the outer surface of the roll shell of the roller 8, these separating surface areas in the device according to FIG. 2 have the shape of the outer surface of an endless, thin-walled, flexible metal sleeve 18, which is placed over a rotatable lower roller 19 and a rotatable upper roller 20 in such a way that the metal sleeve 18 rests on the lower roller 19 in a section in which it contacts the batch flow 5 on the upper run of the belt conveyor 3 and in the area in which the doctor blade 15 scrapes the outer surface of the metal sleeve 18 rests on the upper roller 20. Suitable drive means circulate the metal sleeve 18 in such a way that it moves in the contact area with the batch flow 5 synchronously with the batch flow or to the upper run of the belt conveyor 3.

The lower roller 19 is provided with a heating device 9 to which a heat exchange medium can be applied via a line system 10, in order to heat the thin-walled metal sleeve 18 in the contact area with the batch flow 5 to a temperature at which plastic parts 12 on the outer surface of the metal sleeve stick. A cooling device 13 'downstream of the contact area with the batch flow 5 and acting on the inside of the metal sleeve 18, which corresponds to the cooling device 13 according to FIG. 1, causes the adhesive connection to the plastic parts 12 to strengthen. It should be noted here again that the cooling devices 13 and 13 'are not absolutely necessary. For the rest, FIG. 2 shows the corresponding parts of the embodiment according to FIG. 1 provided with the same reference numerals and their function according to the explanations for Figure 1 easily understandable to the person skilled in the art.

An ultrasonic vibrating device, which is denoted by 17 'in FIG. 2, takes over the task of pouring plastic residues off the outer surface of the metal sleeve 18, provided that the doctor blade 15 cannot completely clean this outer surface.

The advantage of the embodiment according to FIG. 2 is the possibility of providing, in the form of the thin-walled metal sleeve 18, a component of minimal heat capacity which can be heated and cooled quickly, but at the same time due to the support by the lower roller 19 on the one hand and the upper roller 20 on the other hand, it has a high mechanical strength where the contact with the possibly very inhomogeneous batch flow 5 takes place or the doctor blade 15 exerts a high pressure force to achieve a sufficient cleaning effect.

An improvement according to FIG. 3 can be used to improve the rejection result of plastic parts that can be melted by heated separating surface areas in such cases in which these plastic parts do not present any surfaces exposed on the surface of the batch flow 5. The roller 8 on its outer circumference, which provides the heated separating surface areas, contains in its interior a needle roller 21, which is mounted somewhat eccentrically to the roller axis, with lances 23 each articulated to a roller core 22, the radially outer ends of which are guided in openings in the roller shell of the roller 8, which expand funnel-shaped radially inwards. When the needle roller 21 and the roller shell of the roller 8 rotate synchronously, the outer ends of the needles or lances 23 of the needle roller 21 are in the lower region of the roller 8, in which chem makes contact with the batch flow 5, from the outer roll surface in the manner shown in FIG. 3 and are pulled back radially inwards in the upper region of the outer roll surface behind its boundary. In this area, the outer surface of the roll shell of the roll 8 can therefore be scraped off by the doctor blade 15, while the lances or needles 23 in the lower roll area sink into the batch flow 5 and, as it were, the batch parts are forked and mixed.

Like the eccentrically mounted needle roller 21, the salt 8 can be heated, for example, on the inside by a burner arrangement or by superheated steam supply via the conduit system 10, so that not only the heated separating surface areas of the roller shell of the roller 8, but also at times from the outer surface of the lances 23 protruding from the roll shell, melt plastic parts to be separated and selectively establish an adhesive connection to these parts. If the lances 23 are then retracted behind the level of the outer circumference of the roller during the further rotation of the roller arrangement, then, for example, plastic parts adhering to the outer ends of the lances 23 are stripped off at the openings of the roller shell 8 without, however, falling off the roller, since immediately an adhesive connection to the roll shell is also established in the opening area.

Those skilled in the art will recognize that FIG. 3 shows only a cross section in a radial plane of the roller arrangement and that a large number of needle rings form the entirety of the needle roller 21 in a comparatively short axial distance.

FIG. 4 shows a preferred device for separating plastic parts from a batch flow 5. This is again generated in the manner shown by filling the batch into the feed hopper 4 on the driven belt conveyor 3. The belt conveyor guides the batch 5 flows to the higher end of a rotating drum 24 which is slightly inclined with respect to the horizontal, so that the batch flow 5 is thrown off the belt conveyor 3 on the inside of the rotating drum 24 at this higher end of the rotating drum. In the embodiment according to FIG. 4, a construction is shown in which the belt conveyor 3 extends freely cantilevered into the interior of the rotary drum 24 from the end near the viewer to the opposite end, suitable support brackets being provided, but which are are omitted in Figure 4 to simplify the illustration.

It should be expressly pointed out here that such a free projection of the belt conveyor end 3 is expedient in those cases in which the rotary drum 24 is closed at one end, so that both the supply and removal of material flows into the inside of the rotary drum or from inside the rotating drum only from one rotating drum side. However, it goes without saying that the rotary drum 24 can also be loaded or unloaded from both sides if the rotary drum 24 is designed to be open on both sides, as is known to the person skilled in the art, for example, from rotary kilns for carrying out material treatments of all kinds .

The rotary drum 24 is double-walled. Its hollow jacket can be supplied with hot steam via a coaxial superheated steam supply 25 and a hollow shaft extension 26, so that the inner surface of the drum shell facing the interior can be heated, while the outer drum surface is kept relatively cool by suitable heat insulation and emits little heat to keep the facility's energy requirements low.

The rotary drum 24 is turned counterclockwise by the drive device indicated schematically at M in FIG set in rotation, the batch, which was conveyed into the rotating drum by the belt conveyor 3, is carried up on the inner circumference of the rotating drum and falls back to the drum base, the batch gradually becoming due to the inclined position of the rotating drum 24 towards the viewer facing end of the drum and finally falls out of the drum onto a discharge conveyor 27 which conveys the batch directly into the feed hopper of a waste incineration plant 28.

Previously ^* but are ^'plastic parts of the mixed stream 5 have been segregated by the fact that these plastic parts inside surface during circulation of the mixture in the lower region of the rotary drum 24 with the heated release surface areas, namely the Trommel¬, come into contact, sticking to the drum inner surface and the drum inner peripheral are carried up, while the other material components of the batch continue to tumble back to the drum sole during drum rotation. The plastic parts 12 adhering to the inner drum circumference are then removed from the inner drum circumference by the stripping device in the form of the doctor blade 15 and fall onto the conveyor 16, which is inside the rotating drum 24 approximately parallel to its axis or in the horizontal direction over the entire axial length of the drum Drum extends and the plastic parts on a further conveyor 29 which throws the discarded plastic parts into a container 30.

In the embodiment according to FIG. 4, just as in the embodiments according to FIGS. 1 and 2, additional cooling devices, which are connected upstream of the doctor blade 15 with respect to the drum rotation direction, and additional cleaning devices, which are connected upstream of the doctor knife 15 with respect to the drum rotation direction are connected downstream. Such additional devices are when the rotating drum 24 together with the inner drum melmantel circumferential outer drum casing has, expediently moderately outdoor drum interior arranged and extend substantially over the entire axial length of the Dreh¬ drum to the effective drum inner surface which presents the heated release surface areas act to Kings ¹ - NEN.

If, however, the rotary drum 24, as schematically indicated in FIG. 6, is designed such that the outer drum shell stands still, while only the inner drum shell is supported in rotation on flanges and flanged wheels, this inner drum shell cannot only be limited Circumferential sections are heated from the outside thereof, for example by a burner arrangement 31, but can also be acted upon on selected circumferential sections of its outside by cooling devices, ultrasonic vibrating devices and the like.

The combustion gases of the burner arrangement 31 are fed to an exhaust duct 32 via the hollow cylindrical space inside the outer casing of the rotary drum 24.

The rotary drum construction shown in FIG. 6 is, as already indicated above, also suitable for feeding the batch to be treated to the rotary drum on the side facing away from the discharge opening if the outer, stationary drum shell is provided with an input opening into which the Belt conveyor 3 extends into it.

If the rotary drum 24 is heated in such a way that ring-shaped heated separating surface areas which become axially adjoining one another result in an increasingly higher temperature, plastic parts made of plastics with increasingly higher dimensions can be removed from the inner surface of the drum by doctor blades arranged in a staggered manner in the circumferential direction Scrape off the melting point and abandon other or staggered conveyors. In any case, it is important that the temperature of the heated separating surface areas is regulated in such a way that an optimal quantitative separating result is achieved taking into account the garbage consistency, the size of the material parts, the type of plastics to be separated out and the qualitatively desired separating result.

If the plastic parts of the batch flow 5 stick to their inner surface during the circulation of the batch within the rotary drum 4, they form anchoring points which, when carried up on the inside circumference of the drum, prevent the batch from sliding back as a cake at intervals of time to the drum base without being circulated. In those cases in which the holding effect of the plastic parts glued to the inner surface of the drum is insufficient for the circulation effect and the plastic parts initially glued to the inner side of the drum are torn away from the inner surface of the drum by the other material components, the mixture can be circulated be supported within the rotary drum by a construction which is shown in FIG. 7 and which has certain similarities with the construction concept according to FIG. 3.

The rotary drum 24 of the general type according to FIG. 3 has a rotating inner drum 33 and a stationary outer drum 34. The outer drum can be provided with a heat insulation jacket (not shown), so that the hollow cylindrical space between the inner drum 33 and the outer drum 34 is supplied Thermal energy is essentially used to increase the temperature of the inner surface of the inner drum 33.

On the outer surface of the inner drum 33, in addition to funnel-shaped, radially outwardly widening openings 35, bearing blocks 36 are fastened, on which double-armed levers 37 are mounted are. Lance-like elements or rods 38, which are guided with their free ends in the openings 35, are articulated on one end of the lever, while rollers 39 are mounted on the other end of the lever, which, with a cam ring 40 on the inside of the stationary outer drum 34, leads or interact spring loaded.

If the inner drum 33 moves counterclockwise with respect to the illustration in FIG. 7 with respect to the stationary outer drum 34 and the guide link ring 40, the rollers 39 move from a guide curve section 41 of larger diameter to a guide link section by pivoting the lever 37 clockwise 42 of smaller diameter, so that the lance-like elements or rods 38 are retracted from a position in which their free ends project radially inwards beyond the outline of the inner surface of the inner drum 33 into a position in which the free ones Ends of the rods 38, as shown in the upper part of FIG. 7, are retracted radially outward behind the outline of the inner surface of the inner drum 33. If the rods 38 assume the working position shown in FIG. 7 in the upper part, the inner surface of the inner drum 33 can be doctored off by means of a doctor knife 15 from the plastic parts which have melted onto the heated inner surface of the inner drum 33 , wherein the rods 38, when they retract radially outward behind the outline of the inner surface of the inner drum 33, are freed of plastic parts which have also been deposited on them by stripping, similarly as in connection with the embodiment according to FIG 3 has been described.

Instead of the rods 38, wider blade elements extending through slot openings 35 can also be provided, whereby adjacent blade elements in the circumferential direction and in the axial direction can be staggered such that there is no substantial weakening of the wall of the inner drum occurs. It goes without saying that the levers 37 and the rollers 39 as well as the guide cam rings 40 can be provided together for a plurality of rods or blade elements 38 aligned in the axial direction, which simplifies the overall construction.

Claims

1. A method for separating a certain material component from a batch, in particular from household waste, in which physical conditions are created in a separation station, to which the material component in question responds selectively, characterized in that the batch (5) includes heated interface areas (8 or 18 or 24, 33) are brought into contact, parts made of plastic (12), in particular thermoplastic, which are melted due to the temperature of the interface areas and due to the material of the interface areas to them, are melted Partition areas are then moved together with the plastic parts (12) adhering to them from the batch by relative movement between batch and partitions and the plastic parts are finally removed (15) from the partitions.

2. The method according to claim 1, in which the batch is fed to the separation station in a manner known per se as a continuous batch stream (5), characterized in that the separation station acts continuously on the batch stream, the partition surface regions in the Separation station to be approximated to the batch flow or to enforce it and then to be separated again from the batch stream.

3. The method according to claim 1 or 2, characterized in that the separating surface areas (8 or 18 or 24, 33) before the removal (15) of the plastic parts (12) from the separating surface areas are cooled (13 or 13 ') .

4. The method according to any one of claims 1 to 3, characterized gekenn¬ characterized in that the plastic parts (12) from the Trennflächenbe¬ areas are removed by stripping or doctoring (15), ultrasound (15a) being brought into effect if necessary.

5. The method according to any one of claims 1 to 4, characterized gekenn¬ characterized in that after removal of the plastic parts (12) the Trenn¬ surface areas cleaned of adhesive plastic residues

(17 or 17 '), in particular burned off or poured off with ultrasound.

6. The method according to any one of claims 1 to 5, characterized gekenn¬ characterized in that before feeding the batch or batch stream (5) to the heated interface areas (8 or 18 or 24, 33) a separation and / or coarse comminution of the batch ¬ parts done.

7. Device for carrying out the method according to one of claims 1 to 6, in which a batch flow (5), in particular household waste, optionally after separation and / or comminution, can be fed onto a conveyor (3) which enters the separation station, characterized in that the separation station contains a heated roller (8), under which the batch flow passes through contact with the hot outer surface of the roller and that the melted plastic parts (12) adhering to the outer surface of the roller pass by means of a stripping device (15 , 15a) are scraped off the outer surface of the roller.

8. Device according to claim 7, characterized by a preferably provided within the roller (8) Heizvor¬ device (9) in the form of an oil burner arrangement or in the form of an electric heating device or in the form of a hot steam heater or in the form of a heat exchanger.

9. Device according to claim 8, characterized in that the heating device (9) is limited to a contact area with the batch flow (5) containing and / or upstream of the roll with respect to the direction of rotation of the roller.

10. Device according to claim 9, characterized in that a cooling device (13) is arranged on the inside of the roll or on the outside of the roll with respect to the direction of rotation of the roll in the circumferential direction of the contact area with the batch flow (5).

11. Device according to one of claims 7 to 10, characterized in that with respect to the direction of rotation of the roller hin¬ ter the stripping device (15) has a cleaning station (17 or 17 ') for freeing the roller outer surface from adhesive plastic residues, in particular by flame or by means of ultrasound pouring.

12. Device for performing the method according to one of claims 1 to 6, in which a batch flow (5), in particular household waste, optionally after separation and / or comminution, can be fed onto a conveyor (3) which is fed into the Separating station runs in, characterized in that the separating station contains an endless, thin-walled, flexible metal sleeve (18) which is placed over two rollers (19, 20) and which can be driven synchronously with the speed of the conveyor, which in the on the lower roller (19) adjoining section makes contact with the batch flow (5) and can preferably be heated in this area by means of the lower roller supporting it and which can be stripped or doctored off (15) on the longitudinal section adjoining the upper roller (20).

13. The device according to claim 12, characterized in that in the lower roller (19) a heating device (9) is determined.

14. Device according to claim 12 or 13, characterized gekennzeich¬ net that a cooling device (13 ') is arranged in that area of the metal sleeve (18) which is connected downstream with respect to the circumferential direction to the area contacting the batch flow is.

15. Device according to one of claims 12 to 14, characterized in that in that length section of the metal sleeve (18) which is connected upstream of the region with the batch flow (5) with respect to the direction of migration of the metal sleeve, A cleaning station is provided for removing adhesive plastic residues from the metal sleeve surface, in particular by flaming or by shaking off with ultrasound.

16. Device for carrying out the method according to one of claims 1 to 6, in which a batch flow (5), in particular household waste, optionally after separation and / or comminution, can be fed onto a conveyor (3) which enters the separation station, thereby marked that the separating station contains a heated rotary drum (24), which is inclined with respect to the horizontal with its axis or provided with retractable conveyor blades, into which the conveyor delivers the batch flow in such a way that the batch circulates in the rotary drum and on the other hand is conveyed to a discharge end of the rotary drum and that the inner side of the rotary drum interacts with a stripping device or a doctor blade (15) in an area in which adhering plastic parts (12) are lifted out of the recirculated batch .

17. The device according to claim 16, characterized in

- That the rotary drum (24) is double-walled, wherein the outer shell together ^'rotates with the inner casing, and that the hollow cylindrical inner space between inner shell and off via a closed ^senmantel' end of the rotary drum heating steam fed (25, 26).

18. Device according to claim 16, characterized in that the rotary drum (24) is double-walled, the outer jacket of the rotary drum is stationary and that the inner jacket by means of a burner arrangement (31) can be heated from its outside in a circumferentially restricted area (Figcrr 6). ^'

19. Device according to one of claims 16 to 18, characterized in that the outside or the outer jacket of the rotary drum (24) is provided with thermal insulation.

20. Device according to one of claims 16 to 19, characterized in that ultrasonic generators act on the inner wall of the rotary drum in the area of the stripping device (15) and / or in the area of a downstream cleaning station.

21. Device according to one of claims 7 to 20, characterized in that the heated separating surface areas are provided with through-openings (FIGS. 3 and 35, FIG. 7) for heated rods or blades (23 and 38) which are, in particular, curve-controlled (41) drive mechanism (22 or 36, 37, 39) in the working position of the heated surface areas in which they make contact with the batch (5) protrude from the surface of the heated surface areas while the rods or blades in the working position of the heated surface areas, in which they are scraped off by the stripping device (15), are withdrawn behind the surface of the heated surface areas.

22. Device according to one of claims 7 to 21, characterized in that a cascade-like connection of a plurality of separation stations with surface areas gradually increasing surface temperature or by forming successive surface areas with gradually increasing surface temperature enables selective selection of different plastics with respective ones increasing melting point is feasible.