DE102021120953B3 - Process and system for needs-based and mobile destruction of data carriers in collection vehicles - Google Patents

Abstract

The invention relates to a method for the needs-based and mobile destruction of data carriers in collection vehicles using a system that has lockable individual containers for throwing in and receiving data carriers with confidential content and a mobile collection vehicle with a collection container for emptying the lockable individual containers into the collection container, wherein in the collection container, the data carriers emptied from the individual containers are destroyed according to a destruction process, the destruction process having at least one crushing step and one compacting step in a screw compactor and being controlled by a control device.

Description

The invention relates to a method for the needs-based and mobile destruction of data carriers in collection vehicles according to the preamble of claim 1 and systems made up of lockable individual containers for depositing and receiving data carriers with confidential content and a mobile collection vehicle with a collection container according to the preamble of claim 12.

Such methods and such systems are used for the reliable and confidential destruction of data carriers and such methods and systems are regularly used in the provision of destruction services. Such destruction services are regularly used by clients who generate data on data carriers that are not destroyed by the client himself, but by a service company commissioned to do so.

Recycling containers for glass, paper and plastic are set up decentrally in order to achieve a high utilization rate. Since the recyclables are recycled centrally, the contents of the container must be transported to a collection point. This is usually done with trucks that are equipped with collection containers into which the contents of the individual recycling containers can be emptied.

When disposing of waste glass, waste paper or other recyclables, it is irrelevant whether external access to the recyclables is possible. The recyclables are of practically no value to third parties. Even if some recyclables are lost when a container is emptied into the collection container, this is questionable from the point of view of environmental protection, but not with regard to confidentiality.

The situation is different with the disposal of confidential business papers or other data carriers with confidential content, which is the subject of the present invention. The term data carrier primarily refers to paper-based data carriers or, more generally, to fibre-based data carriers, but in principle also includes other data carriers, especially since data is increasingly being stored, processed and sent digitally. In this respect, it is also about the destruction of data carriers on which data is stored in digital form. Nevertheless, the invention is explained and described in more detail below and in the exemplary embodiments primarily with regard to paper-based data carriers, but this is not intended to limit the invention. Paper-based media is only an example of media, albeit a preferred example. The specification of security levels (e.g. P4 or P7) should only be considered as an example, without excluding other material classes or other security levels.

Such data carriers, especially paper-based data carriers, accumulate in large quantities in companies, medical practices, lawyers' offices, freelancers, etc. (hereinafter generally referred to as clients), e.g. at certain times, e.g. when the retention period of certain documents has expired. However, such data carriers are also used in day-to-day work. The data carriers must be reliably destroyed in order to prevent unauthorized third parties from viewing them and to protect the confidentiality of information. The clients do not usually carry out the destruction themselves, but commission specialized companies, hereinafter referred to as destruction service providers. The customer expects his data carriers to be destroyed while maintaining the necessary confidentiality. The destruction service providers can guarantee confidentiality within their company.

The service relationship between the client and the data carrier destruction service provider is regularly such that the client is provided with individual sealed containers by the destruction service provider, into which he can throw his data carriers. For logistical reasons, the contents of these individual containers are transferred to large collection containers and then, according to the state of the art, taken to a central destruction point, for example. When the individual containers are emptied into the collection containers, there is a risk that unauthorized third parties will inspect the papers to be destroyed, or that papers will be stolen or lost.

Here puts the WO 01/96215 A1 on. From this WO 01/96215 A1 a system consisting of lockable individual containers and a collection container for emptying such individual containers is known. The lockable individual containers are usually part of a destruction service and are with a customer so that he can throw confidential papers or other data carriers into the individual containers because disposal via other, general recycling systems is out of the question with regard to confidentiality. These lockable individual containers are emptied by the destruction service provider as part of the service relationship and the destruction service provider operates for this purpose Collection vehicles with collection containers arranged on them. the WO 01/96215 A1 describes such a system consisting of lockable individual containers and a mobile collection container for emptying such individual containers. The mobile collection containers only have a collecting function and the collected goods with confidential data are then taken to a place where the collected goods are destroyed.

the WO 01/96215 A1 deals with how the lockable individual containers can be emptied into the mobile collection container without the possibility of external access, in particular by unauthorized third parties, to the contents of the lockable individual containers during emptying into the collection container. In order to ensure uninterrupted access control and thus provide a guarantee of confidentiality, it proposes that each individual container can only be opened if it is completely enclosed by the collection container. In short, the emptying takes place in a sluice of the collection container. This represents a significant improvement over systems in which filled individual lockable containers are exchanged for empty individual lockable containers and then the exchanged filled individual containers are taken to the location where the collected goods containing confidential data are destroyed.

the DE 30 25 631 A1 describes a stationary facility and procedures to be carried out in a stationary manner for the destruction of data carriers. The data carriers to be destroyed are to be fed to several processing stages of the system in a multi-stage sequence, namely a mechanical coarse crushing stage, a magnetic separation stage, a fine crushing stage and a grinding stage. At the end of this multi-stage destruction, the data carriers should come out of the facility in microgranulated form.

the DE 22 14 786 B2 shows methods and devices for the stationary destruction of data carriers. The data carriers to be destroyed are first shredded mechanically and then pressed to reduce the volume. Before pressing, the reduced data carriers are moistened, for example by adding water in a liquid or vapor state. By moistening the material, a particularly good compression, an improved rendering of the data unrecognizable and a stabilization of the resulting pressed body should be achieved.

the EP 0 289 015 A1 discloses a screw press and method for converting waste paper into manageable compacts, this waste paper not being data carriers with confidential content, but, for example, conventional paper, i.e. a conventional recyclable material that is fed into paper recycling. For this purpose, the screw press has a nozzle in the area of the screw for the supply of liquid. A good and uniform wetting of the waste paper with the liquid should be ensured, so that during the pressing process in the screw press the waste paper can bind well when it is formed into compacts.

the WO 2016/070948 A1 describes a stationary system for the destruction of data carriers. The data carriers are crushed in a crushing step by a percussion mechanism and then water is added to the resulting particles. A crumbly residue that can no longer be read is formed. It is suggested that the water be added before the comminution or during the comminution in the percussion mechanism, since this reduces the friction values in the percussion mechanism.

An alternative procedure is the mobile destruction of data carriers. A mobile device for destroying data carriers is disclosed, for example, by DE 600 24 912 T2 . The mobile device shown there consists of a cutting device in which, for example, the paper fed to the cutting device via a funnel is shredded. This shredded paper enters an auger located below the cutter where it is mixed and pressed into a collection compartment separated by a wall and spaced from the cutter and hopper.

the U.S. 6,491,245 B1 shows a mobile shredding device for the mobile destruction of data carriers. The destruction takes place via a shredder, a screening device and a screw compactor. The data carriers destroyed in this way are then sent to a collection compartment. In this collecting compartment, spray nozzles are arranged on the roof side in order to be able to spray dust-binding liquid from the ceiling down for the purpose of dust binding.

the WO 2014/131593 A1 describes a mobile device that can be used to carry out a mobile data medium destruction process. The data carriers are to be destroyed on the collection vehicle used, with no shredding of the data carriers being provided. Rather, these are to be mixed in a hydromechanical dissolving device (pulper) to form a suspension of shredded data carriers and dissolving fluid. This resulting suspension should then be fed to a paper recycling plant.

the JP 2014 - 18 715 A shows a mobile device and mobile-executed methods for the destruction of data carriers. Packages are manually fed into the shredder. The packets are subjected to a shredding step and then ground up. Liquid is supplied in the grinding step.

The in the DE 10 2019 131 615 B3 disclosed methods and apparatus. If necessary, different levels of destruction can be achieved.

It is an object of the present invention to specify mobile methods and mobile devices which, on the one hand, meet the requirement of maintaining confidentiality, but which, on the other hand, can also be used flexibly with regard to changing customer requirements. Furthermore, the invention is intended to show a way in which this flexibility can be achieved in mobile methods and devices without requiring a large outlay in terms of equipment.

This object is achieved according to the invention by a method having the features of claim 1 and by a device having the features of claim 12. Further advantageous exemplary embodiments and properties of the methods and devices are specified in the subclaims and will be explained later using figures and exemplary embodiments explained.

According to the invention, it is provided that the emptied data carriers are destroyed according to a destruction process, the destruction process having at least one crushing step and a compression step in a screw compactor. The destruction or the destruction process is carried out under the control of a control device according to a first process sequence. In this first process sequence, the emptied data carriers are destroyed after a first security level and the screw compactor is operated in a first operating mode, namely in a conveying mode in which it conveys and compacts shredded material from its input to its output. According to the invention, the destruction takes place, controlled by the control device, if necessary, after a second process sequence, in which case the emptied data carriers are destroyed after a second security level, which is higher than the first security level, in that the screw compactor is at least temporarily in a second process sequence in this second process sequence , is operated from the first different operating mode, namely in a recirculation mode. In this circulation mode, the outlet of the screw compressor is closed and the screw compressor having at least two compressor screws is operated in such a way that at least one compressor screw conveys from the inlet to the outlet and at least one compressor screw conveys in the opposite direction, i.e. away from the outlet. In this way it is achieved that the shredded material circulates in the screw compactor. The exit is closed so that the material is prevented from escaping, the compactor screws are operated in the opposite direction of conveyance, so that a circulating transport process is set in motion. As a result, the comminuted data carrier material remains within the screw compactor for a longer period of time and is subjected to the treatment there more intensively. In this way, a higher degree of destruction can be achieved, particularly in combination with further features from the subclaims.

Insofar as the term security level is used in this application, this term refers to DIN 66399, which has replaced the previous DIN 32759. This standard DIN 66399 (following status 10/2012) deals with various data carriers, for example those with information displayed in the original size, for example paper, films, printing plates. This type of data carrier is abbreviated with the letter "P". Data carriers with reduced information representation, for example microfilms, foil, are abbreviated with the letter "F". Optical media, such as CDs/DVDs, are abbreviated with the letter "O". Magnetic data carriers, e.g. ID cards, floppy disks, are abbreviated with the letter "T", hard drives with magnetic data carriers are abbreviated with the letter "H", Electronic data carriers, e.g. memory sticks, chip cards, are abbreviated with the letter "E". . This DIN 66399 defines protection classes and these protection classes security levels 1-7 are assigned to them. A comparison of the protection classes with the security levels is shown below in tabular form, with this table being taken from the said DIN. protection class security levels 1 2 3 4 5 6 7 1 x ^a x ^a x 2 x x x 3 x x x x ^a for personal data, this combination is not applicable. The capital letters above represent a material classification according to this DIN 66399. DIN 66399 also defines seven security levels. DIN 66399 also specifies when which security level is reached after the destruction process has been carried out. The table below is also taken from the said DIN 66399: security_level explanation 1 Destruction of data carriers in such a way that the data reproduced on them can be reproduced without special tools and specialist knowledge, but not without a particular expenditure of time Recommended e.g. B. for data carriers with general data that are to be made unreadable . 2 Destruction of data carriers in such a way that the data reproduced on them can only be reproduced with tools and special effort Recommended e.g. B. for data carriers with internal data that should be made unreadable . 3 Data carrier destruction in such a way that the reproduction of the data reproduced on them is only possible with considerable effort (people, tools, time). Recommended e.g. B. for data carriers with sensitive and confidential data . 4 Destruction of data carriers in such a way that the data reproduced on them can only be reproduced with exceptional effort (people, tools, time). Recommended e.g. B. for data carriers with particularly sensitive and confidential data . 5 Destruction of data carriers in such a way that the data reproduced on them can only be reproduced using non-standard equipment or special constructions, as well as forensic methods Recommended e.g. B. for data carriers with confidential data 6 Destruction of data carriers in such a way that the reproduction of the data reproduced on them is impossible according to the state of the art Recommended e.g. B. for data carriers with secret data, if extraordinarily high security precautions are to be observed . 7 Destruction of data carriers in such a way that the reproduction of the data reproduced on them is impossible according to the current state of science and technology Recommended for data carriers with data that must be kept strictly confidential if the highest security precautions are to be observed .

This DIN 66399 also contains specific information on when and for which material the above safety level is reached. Thus, in Part 2 of this DIN, several tables are given, one each for the material classes P, F, O, T, H, E. The table for material class P is shown below. Display of information in original size, e.g. E.g.: paper, film, printing forms security_level Condition, shape and size after destruction tolerance P-1 Material particle area ≤ 2 000 mm ² or strip width ≤ 12.0 mm strip length not limited 10% of the material may exceed the required material particle area, but may not exceed 3 800 mm ² . P-2 Material particle area ≤ 800mm ² or strip width ≤ 6.0mm strip length not limited 10% of the material may exceed the required material particle area, but may not exceed 2000 mm ² . P-3 Material particle area ≤ 320mm ² or strip width ≤ 2mm strip length not limited 10% of the material may exceed the required material particle area, but may not exceed 800 mm ² . P-4 Material particle area ≤ 160 mm ² and for regular particles: stripe width ≤ 6 mm 10% of the material may exceed the required material particle area, but may not exceed 480 mm ² . P-5 Material particle area ≤ 30 mm ² and for regular particles: stripe width ≤ 2 mm 10% of the material may exceed the required material particle area, but may not be larger than 90 mm ² . P-6 Material particle area s 10 mm ² and for regular particles: stripe width ≤ 1 mm 10% of the material may exceed the required material particle area, but may not be larger than 30 mm ² . P-7 Material particle area ≤ 5 mm ² and for regular particles: strip width ≤ 1 mm or dissolving with material particle area ≤ 5 mm ² or crushed ash with material particle area ≤ 5 mm ² Material particle area must not be exceeded

For example, security level P1 has been reached, which is recommended for data carriers with general data that are to be made unreadable if a material particle area of ≤ 2000 mm ² or a strip width of ≤ 12 mm is achieved during data carrier destruction. The security levels P2 to P7 are referred to as higher security levels and the requirements for the destruction processes increase in order to achieve destruction according to these higher security levels. For example, DIN 66399 specifies for security level P4 that this is recommended for data carriers with particularly sensitive and confidential data and is achieved when the material particle area is ≤ 160 mm ² and for regular particles a stripe width of ≤ 6 mm and Example, a particle size of ≤ 4 mm x 40 mm is achieved. The highest security level is level P7, which is recommended, for example, for data carriers with data that is to be kept strictly confidential, i.e. when the highest security precautions are to be observed. DIN 66399 also makes specifications for this. After this highest security level, the data carriers are destroyed in such a way that the reproduction of the data reproduced on them is impossible according to the current state of science and technology.

Insofar as security levels are mentioned in the present application, this term corresponds to the term of security levels defined in DIN 66399 and the nomenclature of these security levels also follows the DIN 66399 mentioned. Reference is made to the content of this DIN 66399 in its entirety.

The division into protection classes and the decision according to which security level the data carrier should be destroyed is made regularly by the client. It is then up to the destruction service provider to ensure the destruction of the collected data carriers according to the required and commissioned security level. Previous mobile collection vehicles are provided, for example, to simply collect the data carriers and then unload the collected data carriers at a central destruction site, where the actual destruction process takes place. Other collection vehicles are trained to carry out a destruction process in the collection vehicle, with this destruction process always being the same and taking place according to a specific security level. This procedure cannot be adapted to the different security level needs of different clients. It is e.g. For example, it is possible for destruction to take place in a collection vehicle in accordance with security level P4. Destruction of data carriers according to security level P7 is not possible on such a vehicle and in this respect, in the case of an order for destruction according to security level P7, the collected data carriers would first have to be destroyed according to security level P4 and then, for example, in a central, stationary destruction facility Destruction according to security level P7. However, if data carriers from other clients were also collected in the collection vehicle, these would also have to be subjected to subsequent destruction according to security level P7 for security reasons.

Alternatively, according to the state of the art described, it would be necessary for the collection vehicle to carry out a destruction process according to security level P7 in order to use such collection vehicles to carry out both orders for destruction according to security level P4 and orders for destruction with security level P7 on the same vehicle to be able to Such a procedure would be economically disadvantageous for customer orders that provide for destruction according to security level P4 and for which only a service fee for such a security level is compatible.

Here has the DE 10 2019 131 615 B3 brings about an improvement, because with the method there and with the system there, it is possible to switch from a first method sequence of destruction to a second method sequence of destruction as required and controlled by a control device, i.e. for example from a first method sequence which, for example, leads to destruction of security level P4 leads to a second procedure which, for example, leads to destruction according to security level P7. In this respect, with the procedure there and with a collection vehicle in which such procedures can be carried out, orders for destruction according to different security levels can be carried out reliably and economically without, for example, an additional subsequent destruction procedure having to be carried out as described above, and without the need for precautionary measures Orders for destruction with a lower security level must be carried out using a procedure with a higher security level, without the customer being financially burdened.

According to the present inventive method, the destruction stage is adjusted as required by the screw compactor being able to be operated in two different operating modes, namely in a type known in the prior art and in a second type, which differs from the first and in which the already crushed Material circulates in the compressor screw and is further processed in the sense of a further blurring of data.

The destruction method according to the invention has at least one comminution step. Several comminution steps can also be provided, for example a first coarse comminution and a subsequent fine comminution. It is also possible that the destruction method according to the invention includes further method steps. For example, one or more screening steps could be provided with one or more screens with a predefined screen hole size. With regard to the system, the destruction device is controlled by a control device to operate in a first operating mode. In this first operating mode, the emptied data carriers are destroyed according to a first destruction method and after a first security level, as explained above, for example using the destruction method according to the invention. If required, the control device can operate the destruction device in a second operating mode, namely when destruction is to take place according to a different security level than in the first operating mode. Otherwise, the explanations above and below regarding the method apply in an analogous manner to the system according to the invention, and the explanations regarding the system according to the invention apply in an analogous manner to the method according to the invention.

As a preferred further treatment step within the method according to the invention, the emptied data carriers are treated with a liquid. This exposure should be preferred take place after the shredding of the data carrier, which can absorb the liquid better in shredded form. A corresponding loading device would therefore have to be arranged behind the comminution device in the conveying direction of the data carrier. This impingement could preferably take place from suitably arranged nozzles and in atomized form in order to achieve uniform distribution and to avoid data carrier fractions not coming into contact with liquid. Water is preferably used as the impingement liquid, which is preferred to other liquids in terms of handling, health and environmental compatibility. A liquid tank is advantageously arranged in the collection vehicle, from which the liquid is removed for charging the emptied data carrier. Such a liquid tank can, for example, be arranged in a way that is favorable for the center of gravity of the vehicle. More preferably, for example, the liquid can be mixed with an indicator, for example with a dye, so that exposure of the data carrier to the liquid can be detected using the indicator. In this respect, the indicator could be used to easily identify, for example, that a destruction process is being carried out at a higher security level, while if the indicator is not effective, a destruction process at a lower security level can be identified. The indicator would also indicate when certain material fractions were insufficiently charged.

The amount of liquid to be discharged can advantageously be made dependent in a controlled manner on the amount of data carrier material to be destroyed. The amount of liquid should be measured in such a way that the data carriers used are reliably rendered illegible, as required by the security level to be achieved. The addition of liquid can, for example, be controlled depending on the amount of material on data carriers, by weighing the individual containers before they are emptied and using the determined filling weight as a control variable. The empty weight of the individual containers can, for example, be known and stored, e.g. stored in the control device or in the electronic lock of the individual container, or the individual container can be weighed again after emptying to determine the empty weight

Advantageously, the liquid is added at least during the compaction step and more preferably at least partially within the screw compactor, since intensive mixing of the material takes place in this area and the liquid supplied therefore interacts intensively with the already reduced data carrier material. The addition preferably takes place in the area of the start of the compactor screws, e.g. in the entry area of the screw compactor, because early addition can take place in this area and the material is not yet compacted to such an extent that the liquid no longer reaches areas. Appropriate nozzles or other outlet openings for the liquid can be arranged, for example, in the area of the end of the compressor screws facing away from the screw compressor outlet, e.g. in the housing surrounding the screws.

A particularly advantageous addition of liquid is that liquid is also added before the compaction step, i.e. before the screw compactor, so that the exposure time is increased and, as a result of the compaction not yet having occurred, the data carriers are still easily accessible and wettable for the liquid.

According to the invention, the material is not only conveyed in the direction of the outlet in the second mode of operation of the screw compactor, but rather circulates within the screw compactor, i.e. is at least temporarily also conveyed in the opposite direction. To this end, it can be advantageous that the screw compressor's inlet is also closed in this second operating mode. With both a closed outlet and a closed inlet, a closed system is created in which the data carrier material circulates and is thereby mixed, optionally further comminuted and optionally further saturated with liquid. The dwell time in this system can then be controlled in a defined manner by the control device by opening and closing the exit and/or the entrance. There is an advantageous process control.

For the desired increase in the destruction level, it is advantageous that the compactor screws are at least partially accommodated in a surrounding screw housing and this housing has friction ribs for the conveyed material that protrude into the interior of the housing, in particular friction ribs that extend in the conveying direction and in particular, e.g. also exclusively, on the lower circumference of the housing arranged friction ribs. The material conveyed by the compactor screws is thereby guided along these friction ribs and thereby further comminuted and further ground.

In addition or as an alternative, the above effect can also occur or be improved in that the compressor worms are designed as a worm shaft with an external worm thread and the radially outer edge of the worm thread has friction means with friction surfaces. Such friction means can, for example, be widenings lying radially on the outside, for example in the form of metal strips arranged there.

Advantageously, it is proposed that the screw compressors are operated at different rotational speeds in the first and in the second operating mode of the screw compressor. For example, the rotation speed in the second operating mode, in which the agitation and further blurring of the material is the priority, can be higher in order to achieve faster circulation of the material in the screw compactor and thus reduce the residence time within the screw compactor in favor of increased throughput.

To increase the material throughput, it is also advantageously proposed that the screw compactor has 2n compactor screws, with n being a natural number, and in the second operating mode n compactor screws are operated in one of the opposite conveying directions. n should be greater than 1, n=2 represents a preferred embodiment.

It is advantageous for n greater than or equal to 2 if the compressor screws are driven in pairs. This reduces the number of drive devices required and the coupled driven compressor screws can be driven in a synchronized manner in a simple manner. For thorough mixing of the data carrier material in the screw compressor, it is advantageous if a compressor screw is preferably arranged between the coupled pair of compressor screws and is driven in a coupled manner with another compressor screw. In this way, compressor screws conveying in alternating directions are located next to each other, so that the material is intensively mixed and circulated.

With regard to the individual containers, it is preferred that they have locks that can be actuated electronically. These can be opened and closed in a simple manner and the closed state of these locks can be recorded and monitored and documented in a simple manner. Furthermore, it is preferred that the individual containers can only be opened in the collecting container, for example in a corresponding lock of the collecting container. The advantages of this and possible configurations of this are, for example, in WO 01/96215 A1 specified. The features listed there in claims 4-10 there can also be implemented in the present invention. Another example shows the WO 2017/150972 A1 .

Explicit reference is made to claims 1-10 of these WO 01/96215 A1 and to the explanations and explanations given for this starting in line 23 on page 2 up to line 10 on page 5 of WO 01/96215 A1 . For this reason, the explanations given there are not explicitly reproduced at this point.

Advantageous developments of the methods and systems according to the invention result from the fact that the control device has a wireless communication device. The control device can exchange (transmit and/or receive) data via this wireless communication device, and it is advantageous to use received data to select which destruction method is to be used on the emptied data carriers. In this way, the destruction method to be used can be selected automatically without an operator having to make an entry, e.g. on the collection vehicle or on the collection container.

The wireless communication device mentioned above opens up further advantageous method and system options. For example, the wireless communication device can communicate wirelessly with the electronically operable lock and it could be stored in the electronically operable lock, for example, according to which security level the data carriers inserted there should be destroyed. The wireless communication device could read out this stored information and the control device could then run the corresponding destruction method provided for this security level.

It is also possible, alternatively or additionally, for the wireless communication device to communicate wirelessly with a stationary central control device. In particular, this central control device can be used, for example, to control and manage the services provided and to be provided by the destruction service provider, eg contain information about the clients and their security level requirements, and for example control and manage the collection vehicles in the fleet. For example, it could be in a memory of this central control facility or in a memory that can be accessed by the central control device, with which customer and/or which individual container which destruction method is to be carried out according to which security level. The wireless communication device could therefore receive information from the central control device that a specific security level is stored for a specific and clearly identifiable electronic lock and that a destruction method is therefore to be carried out according to a specific security level. The advantage of such a central storage of this information would be that central data maintenance is possible.

As a further or alternative advantageous possibility, the wireless communication device can communicate wirelessly with a device that is operated by the customer. Such devices could be a mobile telecommunication device, for example a common smartphone. Such a device can also be a remote control device which, for example, can have been made available to the client by the service provider. However, such a device can also be a conventional type of computer device, for example a tablet, a laptop or a PC, via which the client can communicate with the wireless communication device.

As a further or alternative advantageous possibility, the wireless communication device of the control device is used to transmit information about the destruction process to the devices operated by the client. For example, these can be status reports on the course of the process, for example that the process is beginning, that certain intermediate steps have been completed and/or that the process has ended. However, the transmitted information can also be, for example, images or video recordings, for example images or video recordings taken by suitably positioned cameras, for example to capture the emptying of the container in the image and/or the crushing of the emptied data carriers and/or images or video recordings further processing steps. If, for example, the emptied data carrier is exposed to a liquid, a message could be issued. If, for example, an indicator is used, an image or video recording of the final state of the destroyed data carrier could be transmitted at the end of the destruction process. In this way, the client has the opportunity to observe and/or understand the destruction process. For example, a certificate of destruction could also be transmitted and/or before starting the destruction process, information could be transmitted as to the security level according to which destruction will be carried out.

A further or alternative advantageous possibility is that, for example, the destruction process is not carried out until the customer has previously given a release signal via the device he is operating. In this way, the client retains control over whether a destruction process or that a destruction process is carried out. The same advantages result with the further or alternative advantageous possibility that the destruction process is canceled or changed if the customer gives a cancellation signal or a change signal via the facility he is operating. For example, it is possible for the customer to first be notified that a destruction process is to be carried out according to a certain security level. He can then, for example, enter the destruction according to a different security level and the control device would then carry out the destruction according to this changed security level by running a destruction process corresponding to this security level. It is also conceivable for the client to interrupt the destruction process by sending an abort signal.

• 1 eine prinzipienhafte Darstellung zum Grundprinzip eines erfindungsgemäßen Systems und eines erfindungsgemäßen Verfahrens;
• 2a ein schematisches Ablaufdiagramm zu verschiedenen Ablaufschritten bei der Einsammlung und Leerung von Einzelbehältern in einen Sammelbehälter eines Sammelfahrzeuges,
• 2b ein schematisches Ablaufdiagramm zu einem erfindungsgemäßen Vernichtungsverfahren gemäß einem ersten Verfahrensablauf und einem zweiten Verfahrensablauf mit gegenüber dem ersten Verfahrensablauf veränderten Verfahrensschritten,
• 3a, 3b, 3c unterschiedliche perspektivische Darstellungen zu einem Sammelfahrzeug mit einem Sammelbehälter und mit Vernichtungseinrichtungen zur Ausführung des erfindungsgemäßen Verfahrens nach einem Ausführungsbeispiel,
• 4 in prinzipienhafter Darstellung mögliche Steuerungsabläufe und möglichen Informationsaustausch zwischen Kommunikations- und Steuereinrichtungen nach einem erfindungsgemäßen Verfahren und in einem erfindungsgemäßen System, und
• 5a, 5b, 5c, 5d, 5e unterschiedliche perspektivische Darstellungen zu einem beispielhaften Schneckenverdichter zur Ausführung des erfindungsgemäßen Verfahrens nach einem Ausführungsbeispiel.

The invention is to be explained in more detail below with reference to exemplary embodiments and figures. Show it:

• 1 a principled representation of the basic principle of a system according to the invention and a method according to the invention;
• 2a a schematic flow chart of various steps in the collection and emptying of individual containers in a collection container of a collection vehicle,
• 2 B a schematic flowchart for a destruction method according to the invention according to a first method sequence and a second method sequence with method steps that are different compared to the first method sequence,
• 3a , 3b , 3c different perspective views of a collection vehicle with a collection container and with destruction devices for carrying out the method according to the invention according to an embodiment,
• 4 in a representation of principles possible control sequences and possible exchange of information between communication and control devices according to a method according to the invention and in a system according to the invention, and
• 5a , 5b , 5c , 5d , 5e different perspective views of an exemplary screw compressor for carrying out the method according to an embodiment.

1 shows a typical process of a destruction service for a general explanation of the subject matter of the invention. The destruction service provider operates collection vehicles 10 that are equipped with a collection container 12 . Furthermore, according to the invention, in the collection vehicle 10 facilities (in 1 not shown) may be provided which allow the collected data carriers 14 to be destroyed. Details of these destruction devices and details of such destruction methods are explained in later figures.

The collection vehicle 10 works together with individual containers 16, which are usually designed to be lockable, for example preferably with electronic locks. These individual containers 16 are, for example, with a client A and at this client A's, these individual containers 16 are filled with data carriers 14, for example with paper or paper-based documents. A collection vehicle 10 is sent to client A at regular intervals or on request. The filled individual containers 16 located at Client A are taken to the collection vehicle 10, emptied into the collection container 12 on or in the collection vehicle 10, subjected to destruction as will be explained below, and the emptied individual containers 16 are then handed back to Client A so that the individual containers can be disposed of 16 can use again for the purpose of filling with data carriers 14, which are incurred by client A.

Due to space and design, the collection vehicle 10 is equipped with a maximum storage capacity, i.e. the storage volume of empty data carriers 14 and shredded or destroyed data carriers 14 is limited by the available loading volume. The collection vehicle 10 therefore has to drive to a central collection point 18 regularly, for example when the loading limit is reached or at the end of the planned collection route. This can be a recycling plant, for example, in order to supply the destroyed data carriers 14 to a recycling process there. However, this can also be a central station of the destruction service provider, in order to initially receive the collected and destroyed data carriers 14 centrally there, subject them to further processing if necessary, for example to enable subsequent recycling of the collected data carrier material. The emptied collection vehicle 10 can then approach client A again and pick up individual containers 16 for the purpose of emptying them.

2a In a schematic flowchart, FIG. The individual container 16 collected from a customer A is first brought to the collection vehicle 10 . As a rule, the collection vehicle 10 is equipped with a lifting and emptying device 22, referred to below as the lifting device 22 for short. First of all, the individual container 16 , which is still closed, is placed in this lifting device 22 . The individual container 16 is regularly fixed there so that it is held securely when it is lifted and emptied. As soon as the individual container 16 is accommodated in the lifting device 22, access to the individual container 16 can be blocked 24 (lock 24), for example. The lifting device 22 then starts moving 26 and lifts the individual container 16 that has been picked up into an emptying position. At this point in time, possibly also during the lifting process 26, the closing device 28 of the individual container 16 is opened. If this locking device 28 is, for example, an electronically operable lock, an opening signal that opens the lock can be emitted at this point in time. In the case of mechanical locks as the locking device, mechanical unlocking can take place, for example.

As soon as the individual container 16 has reached its emptying position, the contents of the individual container 16 are emptied, for example into a funnel 34 of the collecting container 12 . For this purpose, for example, the lid of the individual container 16 can swing open. However, it would also be conceivable for an opening container floor to be provided. Opening lids are more common. In any case, the content of the individual container 16 is emptied into the opening provided for this purpose, for example a funnel 34 of a collecting container 12 .

After complete emptying 28, the individual container 16 is moved back from the emptying position into a removal position or into its starting position 30. The locking device or the lock is closed again and the closed and emptied individual container 16 can then be removed from the collection vehicle 10, if necessary after the blocking of access 24 has been removed. For example, beginning with the setting down movement 30 of the individual container 16 from the emptying position to the removal position, the first step of the destruction method 32 can be carried out in the collection vehicle 10 . However, it is also possible that the first method step of the destruction method 32 is not carried out until the individual container 16 has been removed from the lock 24, for example. It is also possible that the destruction process already starts during the emptying process in order to process the emptied data carrier material 14 immediately.

2 B shows a schematic flowchart of a method 32 according to the invention for needs-based and mobile destruction of data carriers 14, which is carried out, for example, by the system according to the invention and with the system according to the invention. The actual destruction process 32 begins after the emptying 28 of an individual container 16 into the collection container 12, for example in the hopper 34 of such a collection container 12, ie the above for 2a The steps outlined for emptying an individual container are not considered part of the destruction process. The data carrier material 14 picked up in this way is first subjected to a comminution step 36 . This first comminution step 36 can be a pre-comminution step, for example, in order to initially roughly comminute the data carriers 14 . This first comminution step 36 can be followed by a sieving step 38a, for example, and depending on the data carrier material also a separation step, for example a step in which metallic fractions are removed. If multi-stage comminution is provided, further comminution can take place, for example fine comminution 36a, and this fine comminution 36a can be followed by a further screening step 38b, for example. In this optionally provided first and second screening step 38a, 38b, screens with different hole diameters are used, for example.

A further method step of the example shown for a destruction method 32 consists of a so-called compression 40. This means that the data carrier material 14 arriving at the compression step 40 is compressed under an external pressure. A screw compressor 42 can be used for this purpose, for example. This screw compactor 42 can, for example, transport the data carrier material 14 to a collection compartment 44 at the same time, where the destroyed data carrier material is stored so that it can then be emptied, for example, at a recycling plant 18 or on the premises of the destruction service provider. In principle, screw compressors 42 are already known in the prior art. A preferred embodiment is the subject of 5a until 5e .

For example, the destruction process 32 described above could be the first destruction process performed in the collection bin 12 . However, this first destruction process does not have to include all of the process steps described above. It is only necessary that a shredding step 36 and a compression step 40 take place. This first destruction method leads to the data carriers 14 being destroyed after a first security level. Depending on the disc material, this first level of security could be level P4 or other levels of security level 4 (O4, H4, etc.). Other security levels are also conceivable.

However, collection vehicle 10 can not only carry out this one destruction process to achieve this first security level, but controlled by a control device 46, for example, destruction process 32 can be carried out in a modified form, resulting in a second destruction process that differs from the first, namely, according to the invention, by Modification of compression step 40. Further processing steps can also be added. in 2 B illustrated embodiment should consist of such possible further processing steps that a liquid 48 is added to the data carrier material 14 . It is possible, for example, for the liquid 48 to be added to the data carrier material 14 after the comminution step 36 , for example by a device for adding a suitable liquid 48 being arranged behind the outlet of the first comminution stage 36 . This device can be, for example, one or more nozzles in order to spray the data carrier material 14 with a liquid 48 . It is additionally or alternatively possible for the liquid to be added after a further comminution step 36a or after a first or second sieving step 38a, 38b. Finally, it is additionally or alternatively also possible for the liquid 48 to be supplied during the compression step 40 . To the For example, the screw compressor 42 can advantageously be equipped with outlet openings for such a liquid 48 arranged in the screw housing.

The added liquid 48 could be water, for example, which is stored in a liquid tank 50 arranged in the collection vehicle 10 .

According to the invention, the compression step 40 takes place in a modified form in that the screw compressor 42 is operated in a different manner than that described above. According to the above description, the screw compactor 42 conveys the comminuted data carrier material 14 from its inlet 42a to its outlet 42b. In this other, modified mode of operation, the outlet 42b should preferably be closed and the compression screws 43 of the screw compactor 42 should no longer all be operated in the same way, conveying the data carrier material 14 to the outlet 42b, but some of the compression screws should convey the data carrier material 14 away from the outlet 42b , so that the material 14 within the snail compressor 42 is encouraged all around, indicated with reference sign 41 in 2 B and paraphrased with the term "circulation". See later for exemplary details 5a-5e and the associated description.

the 3a until 3c show different views of a collection container 12 of a collection vehicle 10. The tractor 52 of the collection vehicle 10 is not shown. The collection container 12 consists of a chassis with an undercarriage and a substantially box-shaped structure is provided on this chassis. This box-shaped structure has a pivotable or openable flap 54 at the rear to allow rear access to the collection container 12, namely to a lock 24. In the exemplary embodiment shown, the individual containers 16 are to be fed in at the rear. However, it is also known that access is from the side. The following description based on a rear access is not restrictive of the invention. In addition and likewise without limiting the invention, the collection container 12 has a pivotable roof area at the rear and on the roof in order to provide additional height freedom in the area of the sluice 24 for emptying an individual container. This makes it possible for the collection container 12 to have a normal overall height and for there to be no problems as a result of a particularly high construction, for example when crossing under bridges.

In a way that is not shown, the collection container 12 can have a lifting device 22, as is also already known in principle from the prior art. As in the prior art, this lifting device 22 is equipped with an individual container 16, lifts this individual container 16 in a secured and fixed manner into an emptying position and, after opening the emptying opening, for example the closed lid of the individual container 16, empties the container contents into the collection container 12 in. The individual container 16 can also be opened and closed as in the prior art, so that no detailed description is required here either.

The emptied data carriers 14 fall, for example, into a hopper 34 and from there reach a first shredding device 36, for example designed as rotating cutting rollers, as in 3a indicated below the funnel 34 in a side view. Such crushing devices are known in the prior art in a variety of ways, for example from US 2014/0166789 A1 or the U.S. 8,882,008 B1 . Alternative comminution devices are also known in the prior art, which could also be used within the scope of the present invention. Both the hopper 34 and the shredding device 36 are considered part of the destruction device which is arranged in the collection vehicle 10 or in the collection container 12 in order to immediately subject emptied data carriers 14 to a destruction process 32 . The screw compactor 42 is also considered part of the destruction facility.

For the operation of the destruction device, examples of which are hopper 34 and crushing device 36 and screw compactor 42, and also for the operation of the lifting device 22, as well as for the operation of the 5a-5e shown example of a screw compactor 42, the collection vehicle 10 has supply devices 56 to drive these devices. These supply devices provide electrical, hydraulic and/or pneumatic energy. This can be a power generator, for example. However, it is also possible to take the required energy from the drive motor of the collection vehicle 10 or to supply several fuel-operated units from a fuel supply. This is also fundamentally known in the prior art and therefore does not require a detailed description.

In the top view of 3b It can be seen that the collection compartment 44 is arranged at a distance from the shredding device 34, 36, in which the data carriers 14 destroyed by a destruction method 32 are brought and stored until this compartment 44 is emptied. The connection between this collection compartment 44 and the crushing device 34, 36 is via an in 3b better recognizable screw compactor 42, which compresses the initially shredded data carrier material and thereby conveys it into the collection compartment 44. To the 5a until 5e a more detailed explanation of a preferred embodiment follows.

In a way that is not shown, the destruction device also has devices for adding a liquid 48 carried along in the collection container 12 to the data carrier material. The liquid tank 50 provided for carrying the liquid 48 is in 3b shown.

4 FIG. 12 shows, in a basic and schematic manner, the control device 46 which ensures that the destruction method 32 runs in the collection vehicle 10 or in the collection container 12 . This control device 46 can also control the lifting device 22, for example, and the control device 46 can also take on other control functions.

To control the sequence of destruction process 32 or to control shredding device 34, 36 and to control screw compactor 42, control device 46 is connected to these devices 34, 36, 42 in order, for example, to transmit control signals to shredding device 34, 36 and to be able to send the screw compactor 42. These control signals are selected in such a way that the shredding device 34, 36 shreds the data carriers 14 according to the desired destruction method 32 and the screw compactor 42 is operated in the desired operating mode. In particular, these control signals indicate whether destruction is to be carried out according to a first destruction method or according to a second destruction method. The crushing device 34, 36 and the screw compactor 42 are controlled by these control signals in such a way that, for example, the 2 B Explained compression and promotion takes place in the screw compressor 42 or a revolving circulation 41, and/or possibly an addition of liquid 48 takes place or is omitted. In the circulating circulation mode 41 of the screw compressor 42 and/or when the liquid 48 is added, a higher safety level can be achieved than in the compression and conveying mode of the screw compressor 42 and/or when the liquid 48 is not added destruction process is carried out by the shredding device 34, 36 and the screw compactor 42, and thus what level of security is achieved when carrying out the selected destruction process.

The control device 46 is connected on the input side to different devices which, for example, record information relevant to the destruction process and pass it on to the control device 46 . In relation to the addition of a liquid 48, for example, this can involve a flow meter 58 which, for example, supplies information to the control device 46 as to the amount of liquid 48 that is added per unit of time. The control device 46 can, for example, also be supplied with information by a weighing device 60 which, for example, records the amount of data carrier material 14 that has been emptied from the individual container 16 . This weighing device 60 can, for example, weigh the individual container 16 before it is emptied and after it has been emptied and can deduce the emptied quantity from the difference.

The control device 46 can also be connected to other sensors 62 which, for example, record the rotational speed of a comminution device 36 or the screw compactor 42 or the power consumption of a comminution device 36 or the screw compactor 42 or which in some other way record features or performance characteristics of devices that used for destruction.

However, the control device 46 can also be connected to image-recording and/or video-recording devices 64 . For example, image surveillance and/or video surveillance can be provided in several areas relevant to destruction, for example in the area where individual containers 16 are emptied, for example in the area of shredding 36, 36a and/or for example also in the area of collection compartment 44.

Said devices 58, 60, 62, 64 supply information to the control device 46, namely to the input 66 of the control device 46. The control device 46 can be obtained, for example, using tener information to control the crushing device 34, 36 and / or the screw compressor 42.

The control device 46 also preferably has a wireless communication device 68 in order to communicate wirelessly with external communication devices 70 , 71 , 72 , 74 . These external communication devices 70, 71, 72, 74 can be those that client A has. In addition or as an alternative, the communication device 68 can also communicate with other devices that are provided, for example, by the destruction service provider, e.g. with a central control device in which information relevant to the order and destruction is stored. Finally, there is the possibility that the communication device 68 also communicates with the electronic lock 17 of the individual containers 16, for example in order to read out information stored there, for example on the security level after which the container contents should be destroyed.

The possibility of communication between the control device 68 and external devices 70, 71, 72, 74 arranged at client A allows client A to intervene in a controlling manner. It is shown by way of example that the corresponding device at customer A consists of a smartphone 70 and/or tablet 72 and/or notebook or PC 74 and/or a special remote control unit 71 . Several of these devices could also be available to client A in order to communicate with the control device 46 and thus with the collection vehicle 10 .

In this way it is conceivable, for example, for these devices 70 , 71 , 72 , 74 present at customer A to transmit commands to the control device 46 , for example the command to carry out the destruction process 32 . Upon receipt of such a command, the control device 46 would then trigger the destruction process 32 .

It is also conceivable for further information to be transmitted to the control device 46 via the named devices 70, 71, 72, 74 of client A, for example on the security level according to which the destruction 32 of the collected data carriers 14 is to take place. It is also possible for a destruction process 32 that has started to be interrupted or aborted as soon as the customer A sends a corresponding command to the control device 46 via the device 70, 71, 72, 74 that he has. It is also conceivable that the client A instructs the control device 46 via the devices 70, 71, 72, 74 available to him to change the security level according to which the destruction method 32 is carried out.

In principle, the wireless communication device 68 of the control device 46 also allows information to be transmitted to the devices 70, 71, 72, 74 present at client A. For example, after the destruction process 32 has been completed, this can be a message that the destruction has been completed. However, this can also be a standard certificate of destruction, as is already customary in the prior art and given to a customer A as proof that the data medium was destroyed. However, it is also possible for status reports to be output on the devices 70, 71, 72, 74 at client A or recorded image and/or video material to be transmitted so that client A can observe or monitor the destruction process 32, for example. It is also conceivable that the expiration of the destruction method 32 is only started when a positive confirmation is given by the client A.

the 5a until 5e show in different perspective representations a screw compactor 42 according to the invention, but as an example. This screw compactor 42 can be used to carry out the method according to the invention according to an exemplary embodiment.

5a shows first in a perspective view obliquely from above a screw compressor 42, which is also already in the below 3a and 3b shown funnel 34 is arranged. In the bottom area of this funnel 34 are the in 3a cutting rollers which are still indicated in the side view have been omitted for reasons of clarity, but their drive devices 37 are still shown as starting on the side of the funnel 34 . The data carriers 14 fed into the hopper 34 are comminuted with these cutting rollers and, after this comminution, if necessary supplemented by exposure to a liquid 48, they reach the inlet 42a of the screw compactor 42, which in the exemplary embodiment shown is above the compaction screws 43 is arranged.

5b shows to 5a a view from above, so that the entrance 42a and the subsequent compaction screws 43 are visible. At the peripheral edge of the input 42a kings NEN in a manner not shown, for example, circumferentially spaced several spray nozzles for the delivery of a liquid can be arranged in order to apply and saturate the incoming material 14 with liquid 48 in a targeted manner in this entry area of the screw compactor 42 before the material 14 is conveyed and compacted by the compactor screws 43 .

the 5c until 5e only show the screw compactor 42 with the omission of the funnel 34. In these figures it can be seen that in the housing 45 of the screw compactor 42 a total of four compacting screws 43 are arranged with screw shaft axes aligned in parallel. These compression screws 43 are driven in rotation in pairs by associated drive devices 47a, 47b. In 5c a first drive device 47a is shown on the side of the screw compressor 42 facing the viewer and a second drive device 47b is shown on the opposite side of the screw compressor 42.

5d Figure 12 is essentially a view rotated 90° about a vertical axis 5c . This is in 5d the outlet 42b of the screw compressor 42 can also be seen. This in 5c The locking element 49 shown is also in 5d shown, and from this 5d it can be seen that this closing element 49 leaves the outlet 42b free in the position shown, so that when the compacting screws 43 are rotating, the material 14 conveyed by the screws 43 can escape. The closing element 49 is guided in lateral guide rails and can be moved into a lowered position, for example controlled by the control device 46, in which the outlet 42b is closed. A corresponding drive is available, but not shown in the drawing.

In the partially sectioned plan in 5e it can be seen that the compressor screws 43 are driven in pairs by the two drive devices 47a, 47b. The first and third compressor screw 43a from left to right are driven by the drive device 47b on the left side of the figure, while the second and fourth compressor screw 43b are driven by the drive device 47a arranged on the right side of the figure. For this purpose, the respective compressor worms 43a and 43b have on their side facing away from the outlet 42b and in the area of their bearings 51 pinions on the worm shaft, which are connected via, for example, toothed belts 53a and 53b to a rotationally driven drive shaft of the associated drive motor 47a, 47b. At least one of the two drive devices 47a, 47b can be switched in its drive direction, e.g. the rotationally driven drive shaft can be switched from left-hand rotation to right-hand rotation, so that the drive-connected compaction screws 43a or 43b can also be driven either left-hand or right-hand rotation, and in one case conveying in Are operated in the direction of the output 42b and in the other case are operated conveying away from the output 42b.

in the in 5e In the configuration shown, the compression screws 43a, 43b are arranged alternately in the sense that the pair of screws connected via a common drive is not arranged directly next to one another, but instead a compression screw of the other pair of screws is arranged in between. In this way it is possible, for example, for the first and the third compacting screw to be operated in such a way that they have a different conveying direction than the second and the fourth compacting screw, so that material fed into the screw compactor can circulate within the screw compactor, i.e. is conveyed in a circular manner . With this revolving operation, it is advantageous that the closing element 49 is not in the in 5d Positioning shown is arranged, but the exit 42b is positioned closing, that is lowered. In this way, the data carrier material 14 can remain in the screw compressor 42 for a desired period of time, being conveyed in a rotating manner and thereby being further comminuted, in particular due to the preferably provided friction ribs 53, which, for example, in 5d can be seen on the lower circumference of the screw housing surrounding the compressor screws in the radial direction. These friction ribs 53 extend essentially in the axial direction of the screw shafts of the compaction screws and material conveyed by the compaction screws is guided along these friction ribs 53 and ground up in the process. To enhance this grinding effect, the compacting screws 43 also have friction means 55 on their radial outer circumference, in the sense of means increasing the friction with the conveyed material 14 by attaching a metal strip to the outer edge of the screw thread, which provides an enlarged friction surface.

A typical process sequence according to the invention using this embodiment of a screw compactor 42 could be such that in a first executed destruction process, eg controlled by control device 46, all illustrated compactor screws 43a, 43b are operated conveying in the same direction. About the entrance 42a in the screw compressor 42 entering Data carrier material 14 is conveyed by all compressor screws 43a, 43b in the direction of the outlet 42b and is mixed and compacted in the process. It is possible for liquid 48 to be added, for example via the spray nozzles mentioned above, which are arranged at a circumferential distance at the inlet 42a.

If the data carrier material 14 is to be destroyed according to a second destruction method, which e.g in this mode of operation of the screw compactor 42, two of the screw compressors (e.g. 43a) are operated as in the destruction method described above, and two screw compressors (e.g. 43b) are operated in the opposite direction of rotation, so that two screw compressors (e.g. 43a) now carry out a conveying capacity which leads to the outlet 42b leads, while the other two compressor screws (e.g. 43b) carry out a conveying capacity which leads away from the outlet 42b. At the same time as this explained change in the direction of rotation of one of the two drive devices 47a, 47b, the control device 46 can, for example, also control the closing element 49 to close the outlet 42b by lowering the closing element 49 and positioning itself in front of the outlet 42b. It is also possible here for liquid to be added via the spray nozzles mentioned above and arranged at a circumferential distance at the inlet 42a in order to achieve intensive moistening and penetration of the material 14 circulating in the screw compactor 42 .

In a way that is not shown, not only could the outlet 42b be closed, but also the inlet 42a. Since the input 42a is arranged above the compression screws 43 in the exemplary embodiment shown, this is not absolutely necessary, but can nevertheless be provided.

Claims (12)

Method for the need-based and mobile destruction of data carriers (14) in collection vehicles (10) using a system that has lockable individual containers (16) for inserting and receiving data carriers (14) with confidential content and a mobile collection vehicle (10) with a collection container ( 12) for emptying the lockable individual containers (16) into the collection container (12), the data carriers (14) emptied from the individual containers (16) being destroyed in the collection container (12) according to a destruction process (32), the destruction process (32) has at least one comminution step (36, 36a) and one compression step in a screw compactor (42) and is controlled by a control device (46) and is carried out according to a first process sequence, the emptied data carriers (14) being destroyed in this first process sequence a first security level (P4) takes place and the screw compressor (42) in a first th operating mode, namely in a conveying mode in which it conveys and compacts comminuted material from its inlet (42a) to its outlet (42b), characterized in that the annihilation (32) is controlled by the control device (46), if necessary according to a second process sequence takes place, wherein in this second process sequence the emptied data carriers (14) are destroyed after a second security level (P7), which is higher than the first security level, in that the screw compactor (42) in this second process sequence is at least temporarily in a second, is operated from the first different operating mode, namely in a circulation mode, in which the outlet (42b) of the screw compressor (42) is closed and the screw compressor (42) having at least two compressor screws (43) is operated in such a way that at least one compressor screw (43) conveying towards the outlet (42b) and at least one compressor screw e (43) are operated in a conveying manner in the direction of the outlet (42b). procedure after claim 1 , characterized in that the emptied data carriers (14) are acted upon by a liquid (48), the data carriers (14) being acted upon preferably after they have been comminuted (36), preferably from nozzles and with liquid (48) in atomized form , wherein the application preferably takes place with water, the liquid (48) is preferably stored in a liquid tank (50) arranged in the collecting container (12), the liquid (48) preferably having an indicator added to it. procedure after claim 2 , characterized in that the liquid is added (48) at least during the compression step (40), in particular at least partially within the screw compressor (42), in particular in the region of the start of the compressor screws (43). procedure after claim 2 or 3 , characterized in that liquid is added before the compression step (40). Procedure according to claims 2 or 3 or 4 , characterized in that the liquid is added in a controlled manner depending on the amount of material on data carriers (14), in particular by weighing the filled individual containers (16) before they are emptied. Method according to one of the preceding claims, characterized in that in the second operating mode of the screw compressor (42) its inlet (42a) is closed. Method according to one of the preceding claims, characterized in that the compressor screws (43) are accommodated in a surrounding housing (45) and this housing (45) has friction ribs (53) for the conveyed material projecting into the interior of the housing, in particular friction ribs extending in the conveying direction (53) and in particular friction ribs (53) arranged on the lower circumference of the housing (45). Method according to one of the preceding claims, characterized in that the compressor worms (43) are designed as a worm shaft with an external worm thread and the radially outer edge of the worm thread has friction means (55) with friction surfaces. Method according to one of the preceding claims, characterized in that the compressor screws (43) are operated at different rotational speeds in the first and in the second operating mode of the screw compressor (42). Method according to one of the preceding claims, characterized in that the screw compactor (42) has 2n compactor screws (43), with n being a natural number, and in the second operating mode n compactor screws (43) are operated in one of the opposite conveying directions, in particular with n =2. procedure after claim 10 , where n is greater than or equal to 2, characterized in that the compactor screws (43) are driven in pairs, with one compactor screw (43b) preferably being arranged between the coupled pair of compactor screws (43a), which is driven coupled to another compactor screw (43b). becomes. System consisting of lockable individual containers (16) for inserting and receiving data carriers (14) with confidential content and a mobile collection vehicle (10) with a collection container (12) for emptying the lockable individual containers (16) into the collection container (12), with the collection container (12) there is a destruction device (34, 36, 42) for destroying the data carriers (14) emptied from the individual containers (16), which has at least one shredding device (36, 36a) and a compression device (42), the Destruction device (34, 36, 42) controlled by a control device (46) can be operated in a first operating mode, the emptied data carriers (14) being destroyed in this first operating mode according to a first security level (P4), characterized in that the destruction device (34, 36, 42) controlled by the control device (46) can be operated as required in a second operating mode, i In this second operating mode, the emptied data carriers (14) are destroyed according to a second security level that is higher than the first, with the system and the control device (46) being designed and set up to carry out a method according to one of Claims 1 until 11 .

Images