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 shredding, in particular empty, containers, in particular plastic bottles, such as PET bottles or the like.

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

[0003] To shred the containers, such shredding devices often comprise a shredding unit having at least two shredding rollers arranged opposite one another, which are configured to shred the containers fed to the shredding unit from a feed opening of the shredding unit 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 shredding rollers can be driven synchronously in opposite directions.

[0004] The containers are shredded by feeding the bottles from the feed opening and then being pulled through the shredding rollers due to the rotating movement of the shredding rollers and thereby shredded. Such shredding rollers, which can be designed as knife shafts, for example, can ensure that a large proportion of the supplied containers are shredded into particles of a predetermined size in a single shredding process. However, since the shredding rollers are generally not suitable for shredding the containers in a single shredding process, i.e.In order to completely reduce the particles into particles of a predetermined size in a single movement between the two comminution rollers, at least some components of the containers must be crushed several times by the comminution unit until these components, which are initially oversized, have also been completely reduced into particles of a predetermined size.

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

[0006] To ensure that the comminution unit does not become clogged and that the at least partially comminuted containers or particles are released from the comminution rollers after comminution by the comminution unit, it is generally known from the above-mentioned applications of comminution devices with at least two comminution rollers to provide a scraper arrangement with multiple scrapers, which can be arranged in a direction of passage of the containers through the device downstream of a point at which the fed containers first impact the comminution unit. However, since the scrapers are each known to be arranged in such a way that they cause a scraping away from the respective comminution roller in the direction of a discharge opening of the device, containers that have already been partially comminuted cannot be fed back into the comminution unit.As a consequence, such scrapers are unsuitable for combination with the above-mentioned sieve arrangements.

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

[0008] According to the invention, the object is achieved by a device for crushing containers, in particular plastic bottles, comprising: - a comminution unit having at least two comminution rollers arranged opposite one another, which are designed 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, in particular cutting toothing, running in the circumferential direction around the respective comminution roller, wherein the toothing of each of the at least two comminution rollers is formed from a plurality of toothed sections arranged at a distance from one another 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 end region of the respective comminution roller,in each case a toothless section is formed which is free of a toothing, wherein the toothless sections each have a smaller diameter than the toothed sections, wherein the at least two crushing rollers are arranged relative to one another in such a way that at least some of the toothed sections of at least one crushing roller at least partially dip into the toothless sections of the other crushing roller, - a scraper arrangement which is designed to scrape the containers which have been at least partially crushed by the crushing rollers from the crushing rollers, wherein scrapers of the scraper arrangement each extend close to or contact a corresponding toothless section of the respective crushing roller, and - a sieve arrangement which extends at least partially around the comminution unit and / or the stripper arrangement and has a plurality of through-openings for the crushed containers, wherein each of the plurality of through-openings has a dimension, in particular a diameter, 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 stripper arrangement comprises at least one first stripper which is assigned to one of the at least two comminution rollers and is configured to strip the at least partially crushed containers towards the other of the at least two comminution rollers, and at least one second stripper which is assigned to the other of the at least two comminution rollers and is configured toto strip the at least partially crushed containers in the direction of one of the at least two crushing rollers.

[0009] The solution according to the invention allows, on the one hand, the containers to be shredded multiple times to ensure that each container can preferably be completely shredded into particles of the predetermined size. On the other hand, the scraper arrangement according to the invention simultaneously prevents the shredding unit from becoming blocked 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 can ensure that the containers which have not yet been completely shredded into particles of a predetermined size can be scraped towards the other of the at least two shredding rollers, picked up again by this roller and correspondingly shredded again.Similarly, the at least one second scraper of the other of the at least two comminution rollers can ensure that the containers not yet completely shredded into particles of a predetermined size can be scraped toward one of the at least two comminution rollers, recaptured by one of the comminution rollers, and also re-shredded. Particles that already have the predetermined size after a single comminution process by the comminution rollers can immediately pass through the sieve arrangement and are preferably not re-shredded by the comminution rollers.

[0010] The through-openings of the sieve arrangement can, with regard to the size of their respective dimensions, essentially correspond to the predetermined size of the particles or can 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%, more preferably at least 50%, in order to prevent clogging of the sieve arrangement.

[0011] The at least partially shredded containers 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 through-openings, and can then be used for further recycling.

[0012] Preferably, the axes of rotation of the at least two comminution rollers run essentially parallel. Furthermore, the axes of rotation of the at least two comminution rollers can be arranged in a common, preferably essentially horizontal, plane. The comminution rollers can be driven by one or more drive units, in particular synchronously, for example, an electric motor and / or a corresponding gear unit. Furthermore, the containers are preferably empty containers, in particular empty or essentially empty plastic bottles, for example, PET bottles, which are used, for example, in the food retail sector, especially the beverage retail sector.

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

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

[0015] The invention also proposes that the scrapers of the scraper arrangement each extend close to or contact a corresponding toothless section of the respective comminution roller. This allows a good scraping effect of each scraper of the scraper arrangement to be achieved without restricting the movement of the at least two comminution rollers about their respective axis of rotation. The scraper arrangement can be arranged, for example, in a direction of passage of the containers through the device downstream of a point at which the supplied containers first impact the comminution unit, but is not limited thereto.

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

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

[0018] To further enable reliable fastening of the scrapers, which at the same time does not unduly hinder comminution of the containers, a further exemplary embodiment proposes that the at least one first scraper and the at least one second scraper be attached to a common scraper support, in particular in a floating manner, wherein the common scraper support can preferably be arranged on a side of the comminution unit facing away from the feed opening. If the scrapers are thereby mounted in a floating manner on the common scraper support, at least a slight movement of the scrapers, in particular in the longitudinal direction of the common scraper support, can be enabled during operation of the device according to the invention.

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

[0020] In order 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 support, particularly in a removably manner. The sieve assembly, which can preferably be constructed in multiple parts, can be attached to the common scraper support, particularly in a removably manner, for example by means of a fastening means such as a screw or the like.

[0021] If the device according to the invention comprises the plurality of first scrapers and the plurality of second scrapers, the plurality of first scrapers and the plurality of second scrapers can be arranged alternately on the common scraper support, viewed in a direction that runs substantially parallel to the rotational axis of at least one of the two comminution rollers. This ensures, along the entire extent of the at least two comminution rollers, that the at least partially crushed containers are reliably scraped from one comminution roller toward the other comminution roller and vice versa.

[0022] Furthermore, the scrapers can be designed essentially in a pincer- or fork-like manner 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 approximately 180°.

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

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

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

[0026] In a further development of the last-mentioned exemplary embodiment, it is possible for the dimensions, in particular the diameters, of the plurality of through-openings to vary in the circumferential direction around the respective comminution roller. For example, the dimensions, in particular 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 which do not yet have the predetermined size, i.e., an oversize, are prevented from passing through the through-openings.The smaller design of the passage openings in the side areas ensures that particles recaptured by the respective shredding roller are not undesirably transported through the side openings without being shredded again, even if they are not yet of the desired size. Even the smallest particles, which may already be below the predetermined particle size, can still pass through the passage openings in the side areas of the screen arrangement without being shredded again.

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

[0028] According to a further aspect, the invention relates to a method for comminuting containers, in particular plastic bottles, in particular by means of a device according to the invention, comprising the following steps: - Comminuting the containers into particles of a predetermined size by means of a comminution unit having at least two comminution rollers arranged opposite one another, each of the at least two comminution rollers being driven to rotate about a corresponding axis of rotation, the at least two comminution rollers each having a toothing, in particular cutting toothing, extending in the circumferential direction around the respective comminution roller, the toothing of each of the at least two comminution rollers being formed from a plurality of toothed sections arranged at a distance from one another in the direction of the axis of rotation of the respective comminution roller, a toothless section being formed between adjacent toothed sections, and in particular at at least one end region of the respective comminution roller, which section is free of any toothing,wherein the toothless sections each have a smaller diameter than the toothed sections, wherein the at least two comminution rollers are arranged relative to one another in such a way that at least some of the toothed sections of at least one comminution roller at least partially engage in the toothless sections of the other comminution roller, - stripping the containers at least partially shredded by the shredding rollers from the shredding rollers by means of a stripper arrangement, wherein the strippers of the stripper arrangement each extend close to or contact a corresponding toothless section of the respective shredding roller, and - filtering the crushed containers by means of a sieve arrangement having a plurality of through-openings for the crushed containers, wherein each of the plurality of through-openings has a predetermined dimension, in particular a predetermined diameter, 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 step of stripping further comprises: - Stripping the at least partially shredded containers by means of at least one first stripper of the stripper arrangement, which is assigned to one of the at least two shredding rollers, in the direction of the other of the at least two shredding rollers, and stripping the at least partially shredded containers by means of at least one second stripper of the stripper arrangement, which is assigned to the other of the at least two shredding rollers, in the direction of one of the at least two shredding rollers.

[0029] With regard to the effects and advantages of the method according to the invention, reference is expressly made to the above 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. They show: Fig. 1a: a perspective sectional view of an embodiment of a device according to the invention for crushing containers, Fig. 1b: a side sectional view of the device according to Fig. 1a, Fig. 2a: another perspective sectional view of the device according to Fig. 1a, but with the sieve arrangement removed, Fig. 2b: a side sectional view of the device according to Fig. 2a, Fig. 3a: a perspective view of the device according to Fig. 1a, in which only the crushing rollers, the scraper arrangement and the scraper carrier are shown, and Fig. 3b: a perspective view similar to Fig. 3a, in which only the wiper arrangement and the wiper carrier are shown.

[0032] In the Fig. 1a and Fig. 1b, a device according to the invention for crushing containers is generally designated by the reference numeral 100. The device 100 for crushing containers may also be referred to as a “crushing device.” As shown in the Fig. 1a and Fig. 1b, the device 100 comprises a comminution unit 102, which in the illustrated embodiment comprises at least two crushing rollers 104a and 104b arranged opposite one another. The crushing rollers 104a and 104b are configured to crush containers (not shown), for example PET bottles, fed from a feed opening 105 of the comminution unit 102 into particles of a predetermined size. As shown in the Fig. 1a and Fig. As indicated in Figure 1b, one shredding roller 104a is rotatable about a first rotational axis R1, while the other shredding roller 104b can be rotatable about a rotational axis R2. The two shredding rollers 104a and 104b can each be driven by a drive unit (not shown) about the respective rotational axis R1 or R2, preferably synchronously. However, it is also conceivable for only one of the two shredding rollers 104a and 104b to be driven by a drive unit, and for the drive torque to be transmitted via a corresponding gearing to the other of the at least two shredding rollers in order to also drive these by means of the same drive unit.

[0033] As further stated in the Fig. 1a and Fig. 1b, 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 in Fig. 1b is only partially visible. The scrapers 106a and 106b of the scraper assembly 106 are configured to scrape the containers shredded by the shredding unit 102, i.e., the shredding rollers 104a and 104b, off the shredding rollers 104a and 104b.

[0034] In addition, 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 stripper arrangement 106. Each of the sieve parts 108a and 108b comprises a plurality of through openings 110 (see, for example, Fig. 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 when they have been sufficiently crushed by the crushing unit 102, i.e., crushed into particles of a predetermined size. The diameter D can, for example, be at most 30 mm, preferably at most 20 mm, particularly preferably at most 15 mm.

[0035] In order to enable such comminution of the containers fed to the device 100, the strippers 106a and 106b of the stripper arrangement 106 are designed according to the invention such that the first stripper 106a, which is assigned to one comminution roller 104a, is configured to strip the at least partially comminuted containers in the direction of the other comminution roller 104b, while the second stripper 106b, which is assigned to the other comminution roller 104b, is configured to strip the at least partially comminuted containers in the direction of the one comminution roller 104a.As a result, it is possible for an at least partially shredded container, which has been stripped by the first stripper 106a toward the other shredding roller 104b, to come to rest on the screen assembly 108, be recaptured by the other shredding roller 104b, moved around it in the circumferential direction U, and shredded again by the shredding rollers 104a and 104b by being pulled between the two shredding rollers 104a and 104b. The same applies to the operation of the second stripper 106b, which is configured to strip the at least partially shredded containers toward the one shredding roller 104a. This process is preferably repeated until a respective container is formed only from particles of a predetermined size, which can fall through the through openings 110 at the latest after being stripped by the stripper arrangement 106.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 may further comprise a common scraper support 114, which is provided 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 support 114 by means of a fastening means 112, for example in the form of one or more screws 112.

[0037] The Fig. 2a and Fig. 2b show analogous to the Fig. 1a and Fig. 1b also shows the device 100 in a perspective sectional view and a side sectional view, but for a better overview with the sieve arrangement 108 removed. Furthermore, in the Fig. 2a and Fig. 2b due to a changed position of the scraper 106a of one crushing roller 104a. Regarding the description of the Fig. 2a and Fig. 2b will refer accordingly to the description of the Fig. 1a and Fig. 1b.

[0038] As for example in the following Fig. 3a and Fig. 3b, the device 100 may comprise a plurality of first wipers 106a and / or a plurality of second wipers 106b.

[0039] As further stated in Fig. 3b, the at least one first scraper 106a can comprise a first scraper surface 116a which is curved in the illustrated embodiment and which extends from the one crushing roller 104a (in Fig. 3b not shown) to a point below the other crushing roller 104b (in Fig. 3b also not shown). Analogously, the at least one second scraper 106b comprises a second scraper surface 116b, which extends from the other crushing roller 104b to a point below the one crushing roller 104a. The scraping effect of the second scraper surface 116b is in Fig. 3b is illustrated by a corresponding arrow.

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

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

[0042] As in Fig. 3a, each of the comminution rollers 104a and 104b can each have a toothing 118, in particular a cutting toothing, extending in the circumferential direction U around the respective comminution roller 104a or 104b. The toothing 118 of each of the at least two comminution rollers 104a and 104b can be formed from a plurality of toothed sections 120 arranged spaced apart from one another in the direction of the rotational axis R1 or R2 of the respective comminution roller 104a or 104b. A toothless section 122, which is free of any toothing, can be formed between adjacent toothed sections 120 and / or at at least one end region of the respective comminution roller 104a or 104b. The toothless section 122 preferably has a smaller diameter than the toothed sections 120.As a result, it is possible for the wipers 106a, 106b of the wiper arrangement 106 to each extend close to a corresponding toothless section 122, but preferably without contacting the corresponding toothless section 122.

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

Claims

[1] Device (100) for crushing 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) consists of a plurality of teeth arranged in the direction of the axis of rotation (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 engage in the toothless sections (122) of the other comminution roller (104b), - a stripper arrangement (106) which is designed to strip the containers at least partially shredded by the shredding rollers (104a, 104b) from the shredding rollers (104a, 104b), wherein the strippers (106a, 106b) of the stripper arrangement (106) each extend close to or contact a corresponding toothless section (122) of the respective shredding roller (104a, 104b), and - a sieve arrangement (108) which extends at least partially around the comminution unit (102) and / or the stripper 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 than the predetermined size of the particles by a predetermined amount, wherein the stripper arrangement (106) comprises at least one first stripper (106a), which is assigned to one (104a) of the at least two comminution rollers (104a, 104b) and is configured to strip the at least partially crushed containers in the direction of the other (104b) of the at least two comminution rollers (104a, 104b), and at least one second stripper (106b),which is assigned to the other (104b) of the at least two comminution rollers (104a, 104b) and is designed to strip the at least partially crushed containers in the direction of one (104a) of the at least two comminution 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] The 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 floatingly mounted, 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 is 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 in the direction of passage (L) from the two comminution rollers (104a, 104b). [6] Device according to claim 4 or 5, wherein furthermore the sieve arrangement (108) is attached, in particular detachably, 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 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] Apparatus according to any one of the preceding claims, further comprising a collecting container (124) arranged downstream of the sieve arrangement (108) and adapted to receive the particles of a predetermined size. [12] Method for crushing containers, in particular plastic bottles, in particular by means of a device (100) according to one of the preceding claims, comprising the following steps: - Comminution of 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 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) is formed from a plurality of toothing sections (120) arranged spaced apart from one another in the direction of the axis of rotation (R1, R2) of the respective comminution roller (104a, 104b), wherein between adjacent toothed sections (120) each have 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 engage in the toothless sections (122) of the other comminution roller (104b), - stripping the containers at least partially shredded by the shredding rollers (104a, 104b) from the shredding rollers (104a, 104b) by means of a stripper arrangement (106), wherein the strippers (106a, 106b) of the stripper arrangement (106) each extend close to or contact a corresponding toothless section (122) of the respective shredding roller (104a, 104b), and - filtering the crushed containers by means of a sieve arrangement (108) having 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 than the predetermined size of the particles by a predetermined amount, wherein the stripping step further comprises: - stripping the at least partially shredded 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 shredding rollers (104a, 104b), in the direction of the other (104b) of the at least two shredding rollers (104a, 104b) and stripping the at least partially shredded 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 shredding rollers (104a, 104b), in the direction of one (104a) of the at least two shredding rollers (104a, 104b).

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