Device and method for crushing containers, in particular plastic bottles

Abstract

The invention relates to a device (100) for crushing containers, comprising a crushing unit (102) having at least two crushing rollers (104a, 104b) configured to crush the containers fed to the crushing unit (102) from a feed opening (105) of the crushing unit (102) into particles of a predetermined size, a scraper arrangement (106) configured to scrape the containers at least partially crushed by the crushing rollers (104a, 104b) from the crushing rollers (104a, 104b), and a sieve arrangement (108) having a plurality of through-openings (110) for the crushed containers, wherein the scraper arrangement (106) has at least one first scraper (106a) which is connected to one (104a) of the at least two crushing rollers (104a, 104b) is assigned and is set up for this purpose,The invention comprises a device for scraping the at least partially crushed containers towards the other (104b) of the at least two crushing rollers (104a, 104b), and at least a second scraper (106b) which is associated with the other (104b) of the at least two crushing rollers (104a, 104b) and is configured to scrape the at least partially crushed containers towards one (104a) of the at least two crushing rollers (104a, 104b). The invention further relates to a method for crushing containers.

Description

[0001] The invention relates to a device and a method for crushing, in particular empty, containers, especially plastic bottles, such as PET bottles or the like.

[0002] To recycle empty containers, such as plastic bottles, for example PET bottles, it is generally known to first shred them into particles using a shredding device, whereby it is desirable that the particles after shredding have a maximum predetermined size. However, it should be noted at this point that although the present invention will be described in part below using bottles, such as PET bottles, no limitation of any kind can be derived from this.

[0003] To reduce the size of the containers, such shredding devices often include a shredding unit with at least two opposing shredding rollers. These rollers are designed to reduce the containers fed into the shredding unit through a feed opening into particles of a predetermined size. Each of the at least two shredding rollers can be driven to rotate about a corresponding axis of rotation, for example, by means of an electric drive or the like. The rotation of the shredding rollers can be synchronized and occur in opposite directions.

[0004] The containers are shredded by feeding the bottles in through the feed opening and then drawing them between the shredding rollers due to their rotation, thereby reducing their size. Such shredding rollers, which can be designed, for example, as knife shafts, ensure that a large proportion of the fed containers are reduced to particles of a predetermined size in a single shredding process. However, since the shredding rollers are generally not suitable for reducing the containers to a single size in a single shredding process, i.e.,In order to completely shred the contents of the containers into particles of a predetermined size in a single movement between the two shredding rollers, at least some components must be shredded multiple times by the shredding unit until these components, which initially have an oversized appearance, have also been completely shredded into particles of a predetermined size.

[0005] Furthermore, shredding devices with shredding units are known which have only a rotating shredding roller, for example with wedge-shaped teeth, with a stationary counter-blade. However, such shredding devices cannot, in principle, achieve the required particle size in a single shredding process. For this purpose, it is known that in shredding devices with only one shredding roller, a sieve arrangement can be provided which extends at least partially around the shredding unit and has a plurality of openings for the shredded containers. The openings preferably have a dimension, in particular a diameter, which corresponds essentially to the predetermined particle size, so that only the particles that have already reached or even fallen below the predetermined size can pass through the sieve arrangement.The openings of the sieve assembly can be slightly larger than the required particle size to prevent clogging. Larger particles are captured by the sieve assembly, recaptured by the shredding rollers, and shredded again.

[0006] To ensure that the shredding unit does not become clogged and that the at least partially shredded containers or particles are released from the shredding rollers after shredding, it is generally known from the aforementioned applications of shredding devices with at least two shredding rollers to provide a scraper arrangement with several scrapers. These scrapers can be arranged downstream of the point where the containers first encounter the shredding unit. However, since the scrapers are known to be arranged in such a way that they cause the material to be scraped away from the respective shredding roller towards a discharge opening of the device, partially shredded containers cannot be fed back into the shredding unit.As a result, such scrapers are unsuitable for combination with the aforementioned sieve arrangements.

[0007] It is therefore an object of the present invention to provide a device for crushing containers, by means of which reliable, in particular complete, crushing of containers can be achieved and at the same time an unwanted clogging of the crushing unit is prevented.

[0008] According to the invention, the problem is solved by a device for shredding containers, in particular plastic bottles, comprising: A comminution unit comprising at least two comminution rollers arranged opposite each other, which are configured to comminute the containers fed to the comminution unit from a feed opening of the comminution unit into particles of a predetermined size, wherein each of the at least two comminution rollers is rotatably driven about a corresponding axis of rotation, wherein the at least two comminution rollers each have a toothing extending circumferentially around the respective comminution roller, in particular cutting teeth, wherein the toothing of each of the at least two comminution rollers is formed from several toothed sections spaced apart from each other in the direction of the axis of rotation of the respective comminution roller, wherein between adjacent toothed sections, and in particular at at least one constriction area of ​​the respective comminution roller,a toothless section is formed in each case, which is free of any teeth, wherein the toothless sections each have a smaller diameter than the toothed sections, wherein the at least two shredding rollers are arranged to each other such that at least some of the toothed sections of at least one shredding roller are at least partially immersed in the toothless sections of the other shredding roller, a scraper arrangement which is configured to scrape the containers at least partially shredded by the shredding rollers from the shredding rollers, wherein scrapers of the scraper arrangement each extend close to or contact a corresponding toothless section of the respective shredding roller, and a sieve arrangement,which extends at least partially around the comminution unit and / or the scraper arrangement and has a plurality of through-openings for the comminution containers, each of the plurality of through-openings having a dimension, in particular a diameter, which is substantially equal to the predetermined size of the particles or is larger than the predetermined size of the particles by a predetermined amount, wherein the scraper arrangement comprises at least a first scraper, which is assigned to one of the at least two shredding rollers and is configured to scrape the at least partially shredded containers in the direction of the other of the at least two shredding rollers, and at least a second scraper, which is assigned to the other of the at least two shredding rollers and is configured to scrape the at least partially shredded containers in the direction of one of the at least two shredding rollers.

[0009] The solution according to the invention allows the containers to be shredded multiple times to ensure that each container is preferably completely shredded into particles of a predetermined size. At the same time, the scraper arrangement according to the invention prevents the shredding unit from becoming clogged over time, i.e., after a predetermined number of operating hours of the device. The at least one first scraper of the first of the at least two shredding rollers ensures that the containers not yet completely shredded into particles of a predetermined size are scraped towards the other of the at least two shredding rollers, gripped again, and shredded accordingly.Similarly, at least one second scraper on the other of the at least two shredding rollers ensures that containers not yet completely shredded into particles of a predetermined size are scraped towards one of the at least two shredding rollers, where they can be recaptured and shredded again. Particles that already meet the predetermined size after a single shredding process by the rollers can immediately pass through the sieve arrangement and are preferably not shredded again by the rollers.

[0010] The openings of the sieve arrangement can essentially correspond to the predetermined size of the particles with respect to the size of their respective dimensions, or be designed to be larger than the predetermined size of the particles by a predetermined amount, in particular at least 10%, preferably at least 30%, further preferably at least 50%, in order to prevent clogging of the sieve arrangement.

[0011] The containers, which are at least partially shredded, are preferably shredded again until they consist, in particular only, of particles of a predetermined size which can fall through the sieve arrangement, in particular its openings, and can then be used for further recycling.

[0012] Preferably, the axes of rotation of the at least two shredding rollers are substantially parallel. Furthermore, the axes of rotation of the at least two shredding rollers can be arranged in a common plane, preferably one that is substantially horizontal. The shredding rollers can be driven by one or more drive units, particularly synchronously, for example, an electric motor and / or a corresponding gearbox. Preferably, the containers are empty containers, in particular empty or substantially empty plastic bottles, for example, PET bottles, which are used, for example, in the food trade, especially the beverage trade.

[0013] According to the device according to the invention, the at least two shredding rollers each have a toothing, in particular cutting teeth, extending circumferentially around the respective shredding roller. This allows the containers to be moved between the shredding rollers and simultaneously shredded by means of the toothing.

[0014] Furthermore, according to the invention, the toothing of each of the at least two shredding rollers is formed from several toothed sections spaced apart from one another in the direction of the rotation axis of the respective shredding roller, wherein between adjacent toothed sections, and in particular at at least one end region of the respective shredding roller, a toothless section is formed which is free of any toothing, wherein the toothless sections each have a smaller diameter than the toothed sections. It is also provided that the at least two shredding rollers are arranged relative to one another such that at least some of the toothed sections of the at least one shredding roller at least partially engage with the toothless sections of the other shredding roller in order to further improve the shredding effect of the containers.

[0015] The invention also proposes that the scrapers of the scraper assembly extend close to or contact a corresponding non-toothed section of the respective shredding roller. This ensures effective scraping by each scraper of the assembly without restricting the movement of the at least two shredding rollers around their respective axes of rotation. The scraper assembly can, for example, be arranged downstream of the point where the incoming containers first encounter the shredding unit, but is not limited to this position.

[0016] According to one embodiment of the invention, the at least one first scraper can comprise a first scraper surface, in particular curved, which extends from one of the at least two shredding rollers to a point below the other of the at least two shredding rollers, and / or the at least one second scraper can comprise a second scraper surface, in particular curved, which extends from the other of the at least two shredding rollers to a point below one of the at least two shredding rollers. The point below the respective shredding roller can be located on the side of the shredding unit facing away from the feed opening. This makes it possible for the at least partially shredded containers to be conveyed via the first, in particular curved, or second, scraper surface.The second scraper surface is reliably scraped off by the respective shredding roller, then conveyed in the direction of the other shredding roller and comes to rest on the screen arrangement, in order to then be captured by the other shredding roller for further shredding if necessary.

[0017] In order to allow particularly reliable comminution, especially along the entire extent of the respective comminution roller in a direction parallel to the respective axis of rotation, the scraper arrangement can include a plurality of first scrapers and / or a plurality of second scrapers.

[0018] Furthermore, to ensure reliable attachment of the scrapers without unduly hindering the shredding of the containers, a further embodiment proposes that the at least one first scraper and the at least one second scraper be mounted on a common scraper carrier, preferably in a floating manner, with the common scraper carrier preferably being arranged on a side of the shredding unit facing away from the feed opening. If the scrapers are floatingly mounted on the common scraper carrier, at least a slight movement of the scrapers, particularly in the longitudinal direction of the common scraper carrier, can be permitted during operation of the device according to the invention.

[0019] In a further development of this embodiment, the common scraper carrier, viewed in a direction essentially parallel to the axis of rotation of at least one of the two shredding rollers, can be arranged essentially centrally between the axes of rotation of the two shredding rollers and / or offset from the two shredding rollers by a predetermined distance in the direction of travel. This ensures, to a greater extent, that the common scraper carrier does not impede the re-engagement of the already at least partially shredded containers by the respective shredding roller and can also be easily mounted on the device and easily removed from it for maintenance purposes.

[0020] To make the device according to the invention even more compact and / or easier to maintain, the sieve assembly can be attached to the common scraper carrier, particularly in a detachable manner. The sieve assembly, which preferably may be multi-part, can be attached to the common scraper carrier, particularly detachably, for example, by means of a fastening device such as a screw or the like.

[0021] If the device according to the invention comprises the majority of first scrapers and the majority of second scrapers, the majority of first scrapers and the majority of second scrapers, viewed in a direction that runs substantially parallel to the axis of rotation of at least one of the two shredding rollers, can be arranged alternately on the common scraper carrier. This ensures that, along the entire length of the at least two shredding rollers, the at least partially shredded containers are reliably scraped from one shredding roller towards the other and vice versa.

[0022] Furthermore, the scrapers can be essentially pincer- or fork-shaped at their end facing the respective shredding roller. In other words, the end of each scraper facing the respective shredding roller can extend at least partially around the circumference of the respective shredding roller, for example at an angle of at least 90°, preferably at an angle of about 180°.

[0023] Furthermore, according to another embodiment, the dimension, in particular the diameter, of each of the plurality of through-openings of the sieve arrangement can be at most 30 mm, preferably at most 20 mm, and particularly preferably at most 15 mm. If the through-openings are not circular, they can, for example, also be substantially rectangular, and in particular square. Furthermore, if square, the through-openings can have, for example, dimensions of at most 30 mm x 30 mm, preferably at most 20 mm x 20 mm, and particularly preferably at most 15 mm x 15 mm. However, with a square or rectangular design, it must be taken into account that the diagonal dimension of the through-openings is correspondingly larger than the side lengths of the respective through-openings, and correspondingly larger particles can pass through the through-opening.

[0024] Furthermore, preferably the dimensions, in particular the diameter, of the plurality of through-holes can be at most three times as large, preferably at most twice as large, and particularly preferably at most one and a half times as large as the predetermined size of the particles.

[0025] According to another embodiment, the majority of through-openings can have at least partially different dimensions, in particular diameters.

[0026] In a further development of the latter embodiment, it is possible for the dimensions, particularly the diameters, of the majority of the through-openings to vary in the circumferential direction around the respective comminution roller. For example, the dimensions, particularly the diameters, can preferably be larger in a lower region of the sieve arrangement, which faces a discharge opening of the device, than in lateral regions of the sieve arrangement. This can ensure, for example, that in the lower region of the sieve arrangement only those particles that do not yet have the predetermined size, i.e., are oversized, cannot pass through the through-openings.The smaller size of the openings in the side sections ensures that particles captured by the respective shredding roller are not unintentionally carried through these openings without being shredded again, even though they do not yet reach the desired size. The smallest particles, which may already be below the predetermined particle size, can still pass through the openings in the side sections of the screen assembly without being shredded again.

[0027] In order to collect the particles of predetermined size after sufficient comminution for subsequent processing, the device may further include a collection container which may be arranged downstream of the sieve arrangement and may be configured to receive the particles of predetermined size.

[0028] According to another aspect, the invention relates to a method for crushing containers, in particular plastic bottles, especially by means of a device according to the invention, comprising the following steps: The container is crushed into particles of a predetermined size by means of a crushing unit which has at least two crushing rollers arranged opposite each other, wherein each of the at least two crushing rollers is driven to rotate about a corresponding axis of rotation, wherein the at least two crushing rollers each have a toothing extending circumferentially around the respective crushing roller, in particular cutting teeth, wherein the toothing of each of the at least two crushing rollers is formed from several toothed sections spaced apart from each other in the direction of the axis of rotation of the respective crushing roller, wherein between adjacent toothed sections, and in particular at at least one end region of the respective crushing roller, a toothless section is formed which is free of any teeth.wherein the toothless sections each have a smaller diameter than the toothed sections, wherein the at least two shredding rollers are arranged relative to each other such that at least some of the toothed sections of at least one shredding roller are at least partially immersed in the toothless sections of the other shredding roller, scraping the containers at least partially shredded by the shredding rollers from the shredding rollers by means of a scraper arrangement, wherein the scrapers of the scraper arrangement each extend close to or contact a corresponding toothless section of the respective shredding roller, and filtering the shredded containers by means of a sieve arrangement which has a plurality of through-openings for the shredded containers, wherein each of the plurality of through-openings has a predetermined dimension,in particular, has a predetermined diameter which is essentially equal to the predetermined size of the particles or is larger than the predetermined size of the particles by a predetermined amount. the step of stripping further includes: Stripping the at least partially crushed containers by means of at least one first scraper of the scraper arrangement, which is assigned to one of the at least two crushing rollers, in the direction of the other of the at least two crushing rollers, and stripping the at least partially crushed containers by means of at least one second scraper of the scraper arrangement, which is assigned to the other of the at least two crushing rollers, in the direction of one of the at least two crushing rollers.

[0029] Regarding the effects and advantages of the method according to the invention, explicit reference is made to the preceding description of the device according to the invention. Furthermore, all statements relating to the device according to the invention also apply to the method according to the invention and vice versa.

[0030] Furthermore, the method according to the invention can, if desired, be carried out with a device according to the invention as described above.

[0031] An embodiment of the present invention will be explained in more detail below with reference to the accompanying drawings. These depict: Figure 1a : a perspective sectional view of an embodiment of a device according to the invention for crushing containers, Figure 1b : a lateral sectional view of the device according to Figure 1a , Figure 2a :another perspective sectional view of the device according to Figure 1a , however with the sieve assembly removed, Figure 2b : a lateral sectional view of the device according to Figure 2a , Figure 3a : a perspective view of the device according to Figure 1a , in which only the shredding rollers, the scraper arrangement and the scraper carrier are shown, and Figure 3b : a perspective view similar to Figure 3a , in which only the wiper arrangement and the wiper carrier are shown.

[0032] In the Figures 1a and 1b A device according to the invention for crushing containers is generally characterized by reference numeral 100. The device 100 for crushing containers can also be referred to as a "crushing device". As in the Figures 1a and 1bAs can be seen, the device 100 comprises a shredding unit 102, which in the illustrated embodiment includes at least two shredding rollers 104a and 104b arranged opposite each other. The shredding rollers 104a and 104b are designed to shred containers (not shown), for example PET bottles, fed into the shredding unit 102 via a feed opening 105 into particles of a predetermined size. As shown in the Figures 1a and 1bAs indicated, one shredding roller 104a is rotatable about a first axis of rotation R1, while the other shredding roller 104b can be rotatable about an axis of rotation R2. The two shredding rollers 104a and 104b can each be driven about their respective axes of rotation R1 and R2, preferably synchronously, by a drive unit (not shown). However, it is also conceivable that only one of the two shredding rollers 104a and 104b is driven by a drive unit, and the drive torque is transmitted via a corresponding gear to the other of the at least two shredding rollers in order to drive it by means of the same drive unit.

[0033] As further in the Figures 1a and 1b As shown, the device 100 further comprises a wiper arrangement 106 with at least one first wiper 106a and at least one second wiper 106b. The second wiper 106b is arranged in Figure 1bonly partially recognizable. The scrapers 106a and 106b of the scraper arrangement 106 are designed to scrape the containers shredded by the shredding unit 102, i.e. the shredding rollers 104a and 104b, from the shredding rollers 104a and 104b.

[0034] Furthermore, the device 100 comprises a sieve arrangement 108, which in the illustrated embodiment is formed from a first sieve part 108a and a second sieve part 108b. The sieve parts 108a and 108b extend at least partially around the comminution unit 102 and the scraper arrangement 106. Each of the sieve parts 108a and 108b comprises a plurality of through-openings 110 (see, for example, the figure). Figure 1a), which have a predetermined dimension in the form of a predetermined diameter D. The sieve arrangement 110 ensures that the crushed containers only fall through the through-openings 110 once they have been sufficiently crushed by the crushing unit 102, i.e., reduced to particles of a predetermined size. The diameter D can, for example, be at most 30 mm, preferably at most 20 mm, and particularly preferably at most 15 mm.

[0035] In order to enable such comminution of the containers fed to the device 100, the scrapers 106a and 106b of the scraper arrangement 106 are designed according to the invention such that the first scraper 106a, which is assigned to one comminution roller 104a, is configured to scrape the at least partially comminuted containers in the direction of the other comminution roller 104b, while the second scraper 106b, which is assigned to the other comminution roller 104b, is configured to scrape the at least partially comminuted containers in the direction of one comminution roller 104a.As a result, it is possible for a container that has been at least partially shredded, having been scraped off by the first scraper 106a in the direction of the other shredding roller 104b, to come to rest on the screen arrangement 108, be picked up again by the other shredding roller 104b, moved circumferentially around it U, and shredded again by the shredding rollers 104a and 104b by being pulled between them. The same applies to the operation of the second scraper 106b, which is designed to scrape off the at least partially shredded containers in the direction of one of the shredding rollers 104a. This process is preferably repeated until each container consists only of particles of a predetermined size, which, at the latest after being wiped by the wiper arrangement 106, can fall through the through-openings 110.The particles, which already have the predetermined size after a single comminution process by the comminution rollers 104a and 104b, can immediately fall through the sieve arrangement 108 and are preferably not comminuted again by the comminution rollers 104a and 104b.

[0036] The device 100 can further comprise a common scraper carrier 114, which is designed to support the scraper assembly 106, including at least the first scraper 106a and the second scraper 106b. In the illustrated embodiment, the sieve assembly 108, in particular the sieve parts 108a and 108b, are also attached to the common scraper carrier 114 by means of a fastening means 112, for example in the form of one or more screws 112.

[0037] The Figures 2a and 2b show analogous to the Figures 1a and 1bThe device 100 is also shown in perspective sectional view and side sectional view, respectively, but with the sieve assembly 108 removed for better clarity. Furthermore, the Figures 2a and 2b due to a changed position of the scraper 106a of the shredding roller 104a, clearly recognizable. Regarding the description of the Figures 2a and 2b will be applied accordingly to the description of the Figures 1a and 1b referred.

[0038] As in the following, for example Figures 3a and 3b It can be seen that the device 100 can comprise a plurality of the first wipers 106a and / or a plurality of the second wipers 106b.

[0039] As further in Figure 3b As can be seen, the at least one first scraper 106a can comprise a curved first scraper surface 116a in the illustrated embodiment, which extends from one comminution roller 104a (in Figure 3b(not shown) up to a point below the other crushing roller 104b (in Figure 3b (also not shown) extends. Similarly, the at least one second scraper 106b comprises a second scraper surface 116b, which extends from the other shredding roller 104b to a point below the first shredding roller 104a. The scraping action of the second scraper surface 116b is described in Figure 3b illustrated by a corresponding arrow.

[0040] The wiping effect of the first wiper surface 116a is accordingly analogous to the second wiper surface 116b along the wiper surface 116a.

[0041] As also particularly in Figure 3bAs can be seen, the majority of the first wipers 106a and the majority of the second wipers 106b can be arranged alternately on the common wiper carrier 114 in a direction which is essentially parallel to the axis of rotation R1 and / or R2.

[0042] As in Figure 3aAs can be seen, each of the shredding rollers 104a and 104b can have a toothing 118 extending circumferentially U around the respective shredding roller 104a or 104b, in particular a cutting toothing. The toothing 118 of each of the at least two shredding rollers 104a and 104b can be formed from several toothed sections 120 spaced apart from one another in the direction of the axis of rotation R1 or R2 of the respective shredding roller 104a or 104b. Between adjacent toothed sections 120 and / or at at least one end region of the respective shredding roller 104a or 104b, a toothless section 122 can be formed, which is free of any toothing. The toothless section 122 preferably has a smaller diameter than the toothed sections 120.As a result, it is possible that the wipers 106a, 106b of the wiper arrangement 106 each extend close to a corresponding non-toothed section 122, but preferably without contacting the corresponding non-toothed section 122.

[0043] It should also be added that the device 100 may further comprise a collection container 124, which is in Figure 1a The collection container 124 is only schematically represented by an arrow. It can be arranged downstream of the sieve arrangement 108 and configured to collect particles of a predetermined size for subsequent processing.

Claims

1. Device (100) for comminuting containers, in particular plastic bottles, comprising - a comminution unit (102) which has at least two comminution rollers (104a, 104b) arranged opposite one another, which are designed to comminute the containers fed to the comminution unit (102) from a feed opening (105) of the comminution unit (102) into particles of a predetermined size, wherein each of the at least two comminution rollers (104a, 104b) is drivable in rotation about a corresponding axis of rotation (R1, R2), wherein the at least two comminution rollers (104a, 104b) each have a toothing (118) running in the circumferential direction (U) around the respective comminution roller (104a, 104b), wherein the toothing (118) of each of the at least two comminution rollers (104a, 104b) of several in the direction of the rotation axis (R1, R2) of the respective crushing roller (104a,104b) is formed by toothed sections (120) arranged at a distance from one another, wherein between adjacent toothed sections (120) and / or at at least one end region of the respective comminution roller (104a, 104b) a toothless section (122) is formed which is free of teeth, wherein the toothless sections (122) each have a smaller diameter than the toothed sections (120), wherein the at least two comminution rollers (104a, 104b) are arranged relative to one another in such a way that at least some of the toothed sections (120) of at least one comminution roller (104a) at least partially dip into the toothless sections (122) of the other comminution roller (104b), - a scraper arrangement (106) which is designed to scrape the teeth produced by the comminution rollers (104a, 104b) stripping at least partially crushed containers from the crushing rollers (104a, 104b),wherein the scrapers (106a, 106b) of the scraper arrangement (106) each extend close to or contact a corresponding toothless section (122) of the respective comminution roller (104a, 104b), and - a sieve arrangement (108) which extends at least partially around the comminution unit (102) and / or the scraper arrangement (106) and has a plurality of through-openings (110) for the crushed containers, wherein each of the plurality of through-openings (110) has a predetermined dimension, in particular a predetermined diameter (D), which substantially corresponds to the predetermined size of the particles or is larger by a predetermined amount than the predetermined size of the particles, wherein the scraper arrangement (106) has at least one first scraper (106a) which is assigned to one (104a) of the at least two comminution rollers (104a, 104b) and is designed toto strip the at least partially shredded containers in the direction of the other (104b) of the at least two shredding rollers (104a, 104b), and comprises at least one second stripper (106b) which is assigned to the other (104b) of the at least two shredding rollers (104a, 104b) and is designed to strip the at least partially shredded containers in the direction of one (104a) of the at least two shredding rollers (104a, 104b).

2. Device according to claim 1, wherein the at least one first scraper (106a) comprises a, in particular curved, first scraper surface (116a) which extends from one (104a) of the at least two comminution rollers (104a, 104b) to a point below the other (104b) of the at least two comminution rollers (104a, 104b), and / or the at least one second scraper (106b) comprises a, in particular curved, second scraper surface (116b) which extends from the other (104b) of the at least two comminution rollers (104a, 104b) to a point below the one (104a) of the at least two comminution rollers (104a, 104b).

3. Device according to claim 1 or 2, wherein the wiper arrangement (106) comprises a plurality of the first wipers (106a) and / or a plurality of the second wipers (106b).

4. Device according to one of the preceding claims, wherein the at least one first scraper (106a) and the at least one second scraper (106b) are mounted on a common scraper carrier (114), preferably mounted in a floating manner, wherein the common scraper carrier (114) is preferably arranged on a side of the comminution unit (102) facing away from the feed opening (105).

5. Device according to claim 4, wherein the common scraper carrier (114), viewed in a direction which runs substantially parallel to the axis of rotation (R1, R2) of at least one of the two comminution rollers (104a, 104b), is arranged substantially centrally between the axes of rotation (R1, R2) of the two comminution rollers (104a, 104b) and / or offset by a predetermined distance from the two comminution rollers (104a, 104b) in the direction of passage (L).

6. Device according to claim 4 or 5, wherein the sieve arrangement (108) is further fastened, in particular removably, to the common scraper carrier (114).

7. Device according to claims 3 and 4 and optionally according to claim 5 or 6, wherein the plurality of first scrapers (106a) and the plurality of second scrapers (106b), viewed in a direction which is substantially parallel to the axis of rotation (R1, R2) of at least one of the two comminution rollers (104a, 104b), are arranged alternately on the common scraper carrier (114).

8. Device according to one of the preceding claims, wherein the dimension, in particular the diameter (D), of each of the plurality of through openings (110) is at most 30 mm, preferably at most 20 mm, particularly preferably at most 15 mm.

9. Device according to claim 8, wherein the plurality of through openings (110) have at least partially different dimensions, in particular diameters (D), from one another.

10. Device according to claim 9, wherein the dimensions, in particular the diameters (D), of the plurality of through openings (110) vary as viewed in the circumferential direction (U) around the respective comminution roller (104a, 104b), wherein the dimensions, in particular the diameters (D), are preferably larger in a lower region of the sieve arrangement (108), which faces a discharge opening of the device (100), than in lateral regions of the sieve arrangement (108).

11. Device according to one of the preceding claims, further comprising a collecting container (124) which is arranged downstream of the sieve arrangement (108) and is adapted to receive the particles of a predetermined size.

12. A method for comminuting containers, in particular plastic bottles, in particular by means of a device (100) according to one of the preceding claims, comprising the following steps: - Comminuting the containers into particles of a predetermined size by means of a comminution unit (102) which has at least two comminution rollers (104a, 104b) arranged opposite one another, wherein each of the at least two comminution rollers (104a, 104b) is driven to rotate about a corresponding axis of rotation (R1, R2), wherein the at least two comminution rollers (104a, 104b) each have a toothing (118) running in the circumferential direction (U) around the respective comminution roller (104a, 104b), wherein the toothing (118) of each of the at least two comminution rollers (104a, 104b) consists of a plurality of teeth arranged in the direction of the axis of rotation (R1, R2) of the respective comminution roller (104a,104b) is formed by toothed sections (120) arranged at a distance from one another, wherein between adjacent toothed sections (120) there is formed a toothless section (122) which is free of teeth, wherein the toothless sections (122) each have a smaller diameter than the toothed sections (120), wherein the at least two comminution rollers (104a, 104b) are arranged relative to one another in such a way that at least some of the toothed sections (120) of at least one comminution roller (104a) at least partially dip into the toothless sections (122) of the other comminution roller (104b), - stripping the containers at least partially crushed by the comminution rollers (104a, 104b) from the comminution rollers (104a, 104b) by means of a stripper arrangement (106), wherein the scrapers (106a,106b) of the stripper arrangement (106) each extend close to or contact a corresponding toothless section (122) of the respective comminution roller (104a, 104b), and - filtering the comminuted containers by means of a sieve arrangement (108) which has a plurality of through-openings (110) for the comminuted containers, wherein each of the plurality of through-openings (110) has a predetermined dimension, in particular a predetermined diameter (D), which substantially corresponds to the predetermined size of the particles or is larger than the predetermined size of the particles by a predetermined amount, wherein the stripping step further comprises: - stripping the at least partially comminuted containers by means of at least one first stripper (106a) of the stripper arrangement (106), which is assigned to one (104a) of the at least two comminution rollers (104a, 104b),in the direction of the other (104b) of the at least two comminution rollers (104a, 104b) and stripping the at least partially crushed containers, by means of at least one second stripper (106b) of the stripper arrangement (106), which is assigned to the other (104b) of the at least two comminution rollers (104a, 104b), in the direction of one (104a) of the at least two comminution rollers (104a, 104b).

Images