Method and device for peeling cereal grains

Abstract

The invention relates to a method for peeling cereal grains (100), in particular wheat grains, comprising the following steps: cleaning the cereal grains (100) of contaminants in a cleaning device (10), wetting the cleaned cereal grains (100) in a wetting device (20) for a predefined period of time with water having a predefined temperature, and introducing the wetted cereal grains (100) into a peeling device (30) comprising a housing (32) having a peeling chamber (33) contained therein, in which peeling chamber a rotor (34) rotates with radially outwardly pointing peeling elements (36a) arranged thereon and complementary stationary peeling elements (36b) which originate on the inner side of the housing (32) and interact with the peeling elements (36a) in such a way that the wetted outermost shells (102) of the cereal grains (100) in the peeling chamber (33) are broken open on rotation of the rotor (34) with the generation of a shearing effect, and separating the kernels (104) of the cereal grains (100) from the broken-open outer shells (102) in a classifier (70) by applying heated air to the cereal grains (100) and broken-open shells (102) at a temperature in the range from 35 to 45°C, preferably 40°C. The invention further relates to a device for carrying out said method.

Description

[0001] METHOD AND DEVICE FOR SHEARING CEREAL GRAINS

[0002] The invention relates to a method and a device for dehulling cereal grains, in particular wheat grains, comprising the features of claims 1 and 10.

[0003] The processing of wheat into wheat flour has been known for a long time and takes place, for example, in grain mills. In these mills, the wheat kernels, after being cleaned and moistened with water, including the fruit and seed coats surrounding the kernel and germ of the wheat grains, are fed successively to different pairs of rollers in roller mills, and the resulting flour is separated from the rest of the milled material in appropriate sifters.

[0004] Furthermore, it is known to separate wheat grains from their husk in grain dehulling devices. The husk consists of an outer multilayered fruit husk and an underlying seed coat, which contains a large proportion of the minerals and the main part of the dietary fiber.

[0005] DE 90 12 355 Ul describes such a device for dehulling grain, which has a driven roller surrounded by a sieve, the surface of which is provided with ridges arranged in rows. When the roller rotates, a gap is formed between the inside of the sieve and the radially outer surfaces of the ribs. This gap is slightly less high than the grain kernels to be dehulled, so that the shearing action exerted by the ribs breaks open the kernels and separates them from the corresponding kernels. The detached kernels and kernels are then discharged through an outlet located on the underside of the device and separated from each other by a transverse airflow.

[0006] The problem with the described device is that all layers of the fruit and seed coat are broken up and separated, so that the endosperms, i.e. the kernels of the grains, are indeed separated, but the different layers of the fruit and seed coats are contained as a mixture in the peeled product, which in this form cannot be separated from each other using the known separation methods, or only with great effort.

[0007] However, as the applicant has recognized, harmful substances such as pesticides and toxic substances from the air and rainwater often accumulate in the very outermost layer of the fruit peel, the so-called epidermis or upper cell skin layer, which is exposed to the weather and protects the underlying layers. These substances burden the human organism and are considered the main cause of most of the health problems associated with the consumption of wheat products.

[0008] Accordingly, it is an object of the present invention to provide a method and an arrangement for carrying it out, with which only the outermost layer of the fruit shell of cereal grains, in particular wheat grains, the so-called epidermis, can be separated from the underlying layers of the fruit and seed coats as well as the kernels of the cereal grains.

[0009] This problem is solved according to the invention by a method and a device having the features of claims 1 and 10.

[0010] Further features of the invention are contained in the dependent claims.

[0011] According to the invention, a method for dehulling grains, in particular wheat grains, comprises cleaning the grains of impurities in a cleaning device, wetting the cleaned grains with water of a predetermined temperature in a wetting device for a predetermined period of time, and inserting the cleaned and wetted grains into a dehulling device. The dehulling device includes a rotor rotating in a housing within a dehulling chamber, with radially outwardly projecting dehulling elements arranged thereon and complementary stationary dehulling elements extending from the inside of the housing. These stationary elements interact with the dehulling elements in such a way that the moistened outer shells of the grains are broken open in the dehulling chamber during rotation of the rotor, generating a shearing effect.and the subsequent separation of the kernels of the cereal grains from the broken outer husks in a classifier using heated air, preferably at a temperature in the range of 35 to 45 °C. Preferably, the temperature of the separating air supplied to the classifier is 40 °C, which also results to some extent in the advantageous drying of the surface by removing adhering water droplets.

[0012] As the applicant has found in numerous experiments, combining the individual steps of the inventive process yields a final product with a purity level of almost 100%. This means that, for example, 1 kg of the final product contains only a single wheat kernel in which the outer husk, i.e., the epidermis, has not been completely removed, or in which the hulled kernel has been mechanically damaged.

[0013] In the preferred embodiment of the process, the cleaned grains are moistened with water by conveying them through a water bath using an inclined screw conveyor or, alternatively, a sieve drum that can be pivoted and immersed in the water bath. The contact time of the grains with the water is advantageously between 4 and 8 minutes, and particularly is 6 minutes. As the applicant has found, the maximum achievable purity of the final product can be optimized by selecting the aforementioned contact time, which is particularly advantageous depending on the relative moisture content of the unhulled grains before or after cleaning.This can be further increased by adjusting the water temperature during the aforementioned wetting times so that it is between 15°C and 25°C, with the applicant finding that the temperature for an optimal result is approximately 20°C.

[0014] In the case of wetting the grain kernels by means of a screw conveyor, it has proven particularly advantageous if its inclination to the horizontal is adjusted so that the first inlet end of the screw conveyor lies in the water bath and the second outlet end is arranged outside the water bath, so that the pre-cleaned grain kernels come into contact with the water bath for a shorter or longer residence time by increasing or decreasing the rotational speed of the screw conveyor.The inclination of the screw conveyor to the horizontal can be, for example, 10-30° and further leads to the advantage that, after the grain kernels exit the water bath, the water can drain out of the screw conveyor due to gravity via appropriate sieve openings or the like, which can be formed on the bottom of the screw conveyor housing, so that partial dewatering already takes place during the transport of the moistened grain kernels in the screw conveyor.

[0015] According to a further aspect of the invention, the water-wetted grain kernels are sieved and / or dried in a drying device, particularly a rotary sieve, before being fed to the dehulling device. The sieve of the rotary sieve has a mesh size preferably between 300 and 600 pm, and particularly preferably 500 pm. The moisture content of the grain kernels after the drying process is preferably between 4% and 8%, and particularly preferably 6%. Drum sieves can be used as the rotary sieve in this process. The material to be sieved is fed from above and introduced into the rotating drum via a horizontally randomly oriented screw conveyor at one end, where it is sieved before exiting the drum at the other end.This allows any remaining dirt particles and excess water to be removed from the grain kernels through the sieve openings due to the additional centrifugal forces. Such rotary sieving devices are known and are, for example, marketed under the product name Palafix by Englsmann in Ludwigshafen, Germany.

[0016] In the preferred embodiment of the invention, it is further provided that the grain kernels are fed to the dehulling device in batches with a substantially constant volume of wheat kernels via a buffer storage tank 40 and a sensor-controlled flap arrangement. The flap arrangement comprises a first inlet-side flap associated with the inlet of the dehulling device and a second outlet-side flap associated with the outlet of the dehulling device. These flaps are opened and closed by a control device such that the first inlet-side flap is opened for a predetermined, preferably adjustable, duration, allowing a predetermined volume of moistened grain kernels to flow from the buffer storage tank into the dehulling device when the outlet-side flap is closed.This can also be supported, for example, by a suitable horizontally arranged screw conveyor, the inlet of which is located below the buffer storage and the outlet of which is above the inlet-side flap, and which conveys the material from the buffer storage to the inlet at the top of the dehulling device, which has a stationary rotor. After a predetermined quantity of grain kernels has been introduced into the dehulling chamber through the open inlet-side flap with the outlet-side flap closed, the inlet-side flap is closed for a predetermined duration during the subsequent dehulling process while the screw conveyor rotates. After the dehulling process is complete, the second outlet-side flap is opened, and the dehulled material is discharged from the dehulling device with the first inlet-side flap closed.Naturally, numerous other possibilities exist for introducing a predetermined volume of moistened and cleaned wheat kernels as a batch into the dehulling chamber of the dehulling device and discharging them after the actual dehulling process. For example, in conjunction with the aforementioned screw conveyor, it can be provided that the weight of the dehulling device, or rather the housing containing the dehulling chamber, is measured by sensors as the chamber is filled with grain kernels. This means that the housing, which stands on feet and contains the dehulling chamber, is weighed, and the inlet flap is closed when the measured weight has increased by the weight of the batch of grain kernels being filled.

[0017] To ensure complete emptying of the dehulling chamber, a material sensor may be installed at the outlet of the dehulling device to detect the presence of wheat kernels in the outlet area. Based on the signals from the material sensor, the control unit then closes the second outlet-side flap and subsequently reopens the first inlet-side flap 38a for a predetermined period once the material sensor detects no more grain kernels in the outlet area, i.e., when all dehulled grain kernels have been removed from the dehulling chamber.In the preferred embodiment of the method according to the invention, the rotor of the peeling device can be driven by a variable-speed electric motor, which during the peeling process is preferably in a range between 70 rpm and 150 rpm and particularly preferably between 90 rpm and 120 rpm.

[0018] It has proven particularly advantageous if the rotor of the dehulling device is driven by the variable-speed electric motor at a reduced speed compared to the speed of the dehulling process during filling and / or emptying of the dehulling chamber, in particular at a speed of less than 10 L' / min. As the applicant has recognized, this has the advantage that the dehulling chamber is homogeneously filled with the grain kernels to be dehulled and is subsequently completely emptied.

[0019] According to a further aspect of the invention, the broken outer husks of the wheat kernels, separated from the kernels in the classifier by the heated air, are introduced together with the air as an airflow into a cyclone separator, where they are separated from the airflow and preferably transferred to a collection container, in particular a big bag, for further processing. This opens up the possibility that the outer husks can also be further utilized if desired, for example, to recover the proteins they contain.

[0020] The method according to the invention is described below with reference to the drawing, using a preferred embodiment of an arrangement according to the invention for carrying out the method.

[0021] The drawing shows:

[0022] Fig. 1 shows a schematic representation of the arrangement according to the invention with its essential components. As shown in Fig. 1, an arrangement 1 for carrying out the inventive method for dehulling grain kernels 100, in particular wheat kernels, comprises a cleaning device 10 symbolized by a magnet and sieves, in which the grain kernels 100 are subjected to black cleaning. In addition to the magnet 12 and optionally associated sensors for detecting ferritic impurities, the cleaning device 10 contains one or more known sieve devices 14, such as a drum sieve or a long-stroke sieve, to remove small seeds and dirt particles, as well as other fine particles, in the same way as, for example, overgrains with a larger diameter or length than the grain kernels to be dehulled.In the case of wheat, several sieves with mesh sizes of 2 mm to 4 mm are preferably used, resulting in a good product with a 2–4 ​​mm fraction suitable for further processing. The sieving devices 14, which are known per se, are not shown in detail in Fig. 1 for the sake of clarity.

[0023] After passing through the cleaning unit 10, the pre-cleaned grain kernels 10 are moistened with water of a predetermined temperature in a wetting unit 20 for a predetermined period of time. For this purpose, the grain kernels are conveyed through a water bath 22 by means of a known screw conveyor 24, which has an inclination angle relative to the horizontal, preferably adjustable, such that, as indicated in Fig. 1, its first inlet end 24a is in the water bath 22 and its second outlet end 24b is outside the water bath 22. In order to be able to adjust the contact time of the grain kernels 10 with the water to a preferred value between 4 and 8 minutes, in particular 6 minutes, the screw conveyor 24 can be driven by an electric motor with a frequency converter (shown only schematically) at a continuously variable speed.As the applicant discovered, a particularly good dehulling result with low waste is achieved when – in combination with the aforementioned residence time of the grain kernels 100 in the water bath 22 – the water temperature is set to a value between 15 and 25 °C, and preferably to 20 °C. Alternatively, the grain kernels can also be wetted using a rotary sieve drum (not shown in detail), which is closed after the grain kernels have been placed inside and immersed in a water bath for a predetermined period. The aforementioned methods of wetting the grain kernels have the advantage that they are wetted uniformly across their entire surface.

[0024] Since residual dirt particles from the pre-cleaned and moistened grains 100 also enter the water bath 22 and accumulate therein, the water is preferably extracted from the water bath 22 via a pump 21 and a filter and temperature control unit 25, filtered and tempered, and then recirculated back into the water bath 22. The water level is also monitored by a sensor (not shown) in the water bath 22, and the amount of water removed by the moistened grains 100 is replenished. As the applicant has determined through trials, the water consumption per ton of grains 100 supplied is approximately 70 liters, so a constant supply of tempered fresh water must preferably be added to the process to maintain the most homogeneous wetting possible over a given production period.

[0025] The inclined screw conveyor 24 then preferably conveys the water-wetted grains 100 to a drying device 50, which is particularly advantageously designed as a rotary sieve in which the grains 100 are sieved and simultaneously dried under the influence of centrifugal force in the rotating sieve drum. A rotary sieve known from the prior art under the product name Palaflx has proven particularly advantageous in this regard, the sieve drum 52 of which is rotatable by an electric motor with variable speed and has a mesh size in the range of preferably 300 to 600 µm, particularly preferably 500 µm.The selected mesh size ensures that the remaining water is discharged via the sieve 52 into the fines outlet, while the wheat kernels 100 fall out through the coarses outlet without mechanical damage and are then metered to the downstream dehulling device 30. Spinning the moistened grain kernels 100 in the rotating sieve drum 52 of the rotary sieve removes the excess water from the surface of the grain kernels, so that the residual moisture after the drying process is preferably between 4% and 8%, and particularly preferably 6%.

[0026] The grain kernels 100, which have been dehumidified of adhering surface water in the sieve drum 52 of the rotary sieve device, are then fed to a buffer storage tank 40, and from there, via a flap arrangement 38 controlled by sensors (not shown), preferably electrically and / or pneumatically actuated, in batches with a substantially constant volume / weight of e.g. 12 kg, to a peeling device 30.

[0027] The peeling device 30 has a housing 32 with a peeling chamber 33 formed therein, in which a rotor 34 with peeling elements 36a arranged on it, extending radially outwards, rotates. These peeling elements 36a interact with complementary stationary peeling elements 36b originating on the inside of the housing 32, as indicated in Fig. 1, so that the moistened outer husks 102 of the grain kernels 100 are broken open in the peeling chamber 33 when the rotor 34 rotates, generating a shearing action.

[0028] The rod- and / or finger-shaped, preferably steel, and in particular stainless steel, circumferential peeling elements 36a on the rotor 34, as well as the complementary stationary peeling elements 36b on the inner wall of the peeling chamber 33, are only schematically indicated in Fig. 1. Viewed in the vertical direction along the axis of rotation of the rotor 34, the elements 26a, 26b are alternately offset from one another and attached to the outside of the rotor 34 and to the inner wall of the peeling chamber, the clear distance between a rod-shaped peeling element 26a and the adjacent stationary complementary rod-shaped peeling element 26b being slightly larger than the minimum diameter of the grain kernels 100.In a preferred embodiment of the invention, the rotor 34 is advantageously designed as a spiked roller, in which the peeling elements 36a are preferably welded in a loose arrangement to a central shaft which extends vertically through the housing 32, as indicated in Fig. 1.

[0029] The rotor 34 of the peeling device 30 is preferably driven by a motor 31 via a reduction gear. In the case of a peeling chamber 33, which can, for example, hold a batch of 12 kg of moistened beverage 100, the motor 31 can have a drive power of, for example, 30-50 kW. The motor 31 is preferably an electric motor operated via a known frequency converter whose speed is continuously variable.

[0030] In the preferred embodiment of the method according to the invention, the rotor 34 of the peeling device 30 is driven by an electric motor 31 with a rotor speed which, during the peeling process, is preferably in a range between 70 rpm and 150 rpm and particularly preferably between 90 rpm and 120 rpm.

[0031] To make the filling process particularly effective, the rotor 34 of the peeling device 30 is driven by the motor 31 at a reduced speed compared to the speed of the actual peeling process during the filling and / or emptying of the peeling chamber 33, in particular at a speed of less than 10 rpm.

[0032] As can be further seen from the illustration in Fig. 1, the flap arrangement 38, through which the peeling chamber 33 is filled and emptied, in the preferred embodiment has a first inlet-side flap 38a associated with the inlet 35 of the peeling device 30 and a second outlet-side flap 38b associated with the outlet 37 of the peeling device 30, which are schematically depicted as slide gates and are actuated by indicated electrical and / or pneumatic or other known actuators as well as an electronic control device not shown in detail. It is provided that the first inlet-side flap 38a is opened for a predetermined, preferably adjustable, duration of time, so that, with the outlet-side flap 38b closed, a predetermined volume of grain kernels 100 flows from the buffer storage 40 into the peeling device 30.The transport of the grain kernels 100 from the buffer storage 40 to the inlet 35 of the dehulling device 30 can be carried out simultaneously or alternatively via a screw conveyor, which is preferably only rotated by an associated drive motor for a predetermined period of time when the inlet-side flap 38a is open in order to supply the dehulling chamber 33 with a quantity of grain kernels 100 corresponding to the desired, predetermined volume of a batch. As soon as the dehulling chamber 32 is filled with the desired volume, which may, for example, correspond to 70% of the volume of the dehulling chamber 33, the two flaps 38a, 38b are opened for a predetermined period of time, e.g., during the subsequent dehulling process.The first inlet flap 38a is closed for 10 minutes, after which only the second outlet-side flap 38b is opened, and the dehulled grain kernels 100, together with the separated outer husks, are conveyed out of the dehulling device 30 with the first inlet-side flap 38a closed. As indicated in Fig. 1, the dehulling chamber 33 is preferably emptied by gravity, with the dehulled wheat kernels 100 being fed to a classifier 70 via a transport device 60, for example a conveyor belt shown, or via another screw conveyor not shown.

[0033] In addition, motor-operated slides or scraping devices, not shown in detail, may also be provided in the outlet to completely remove the hulled wheat kernels 100 and husks 102 from the hulling chamber 33 zis if they have accumulated there at certain points over a certain period of time.

[0034] In the preferred embodiment of the invention, a material sensor 39 can be arranged at the outlet 37 of the peeling device 30, with which the presence of wheat kernels 100 in the area of ​​the outlet 37 can be detected, and depending on its signals, the second outlet-side flap 38b is closed by the control device and then the first inlet-side flap 38a is opened for a predetermined period of time if no wheat kernels 100 are detected by the material sensor 39 in the area of ​​the outlet 37.

[0035] In the classifier 70, the kernels 104 of the grain kernels 100 are separated from the broken outer husks 102 by the action of an airflow 72, which is directed at the mixture of grain kernels 100 and broken husks 102. As previously described, the airflow is heated to a target temperature in the range of 35 to 45 °C, preferably 40 °C, in a heating device 74 before entering the classifier.

[0036] The classifier 70 is preferably a known zigzag classifier with preferably adjustable chute elements, schematically indicated in Fig. 1, over which the hulled material discharged from the hulling device 30 is deflected several times and thereby separated, so that the hulled grain kernels 104 are fed, on the one hand, via a first outlet arranged on the underside of the classifier 70 into a collection container 76 arranged below the classifier 70, and on the other hand, the separated husks 102 of the grain kernels 100 are fed, via a further outlet arranged horizontally in the illustration of Fig. 1, to a cyclone separator 80. In the cyclone separator 80, the husks 102 are separated from the airflow 72 and fed into a collection container 82, in particular a big bag, for further processing or disposal. List of reference numerals

[0037] 1. Order in accordance with the invention

[0038] 10 Cleaning device

[0039] 12 Magnet

[0040] 14 sieves

[0041] 20 wetting device

[0042] 21 Pump

[0043] 22 Water bath

[0044] 24 auger

[0045] 24a Inlet end of the screw conveyor

[0046] 24b outlet end of the screw conveyor

[0047] 25 Filter and temperature control unit

[0048] 30 peeling device

[0049] 31 Motor of the peeling device

[0050] 32 Housing of the peeling device

[0051] 33 peeling room

[0052] 34 Rotor

[0053] 35 Inlet of the peeling device

[0054] 36a Peeling elements on the rotor

[0055] 36b complementary peeling elements on the inner wall of the housing 37 outlet of the peeling device

[0056] 38 flap arrangement

[0057] 38a Inlet-side flap of the peeling device

[0058] 38b outlet-side flap of the peeling device

[0059] 39 Material - Sensor

[0060] 40 buffer storage tanks

[0061] 50 drying equipment

[0062] 52 Drum of the drying unit / rotary screen unit 60 Transport unit / conveyor belt

[0063] 70 sifters

[0064] 72 Airflow in the classifier 74 Heating device

[0065] 76 Collection containers for peeled kernels 80 Cyclone separator

[0066] 82 Containers for separated outer shells 100 grains of cereal

[0067] 102 outer husks of cereal grains 104 kernels of cereal grains

Claims

Claims 1. Method for dehulling cereal grains (100), in particular wheat grains, comprising the following process steps: Cleaning the grain kernels (100) in a cleaning device (10) to remove impurities, Wetting the cleaned grain kernels (100) in a wetting device (20) with water of a specified temperature for a specified period of time, Introducing the moistened grain kernels (100) into a dehulling device (30) comprising a housing (32) with a dehulling chamber (33) contained therein, in which a rotor (34) with radially outwardly extending dehulling elements (36a) and complementary stationary dehulling elements (36b) originating on the inside of the housing (32) rotates, which interact with the dehulling elements (36a) in such a way that the moistened outer husks (102) of the grain kernels (100) are broken open in the dehulling chamber (33) when the rotor (34) rotates, generating a shearing effect, and Separating the kernels (104) of the cereal grains (100) from the broken outer shells (102) in a classifier (70) by applying heated air (72) to the cereal grains (100) and broken shells (102), preferably at a temperature in the range of 35 to 45 °C, particularly preferably 40 °C.

2. Method according to claim 1, d ad urc hg eke nnzei chn et, that the wetting of the cleaned cereal grains (100) with water is carried out by conveying them through a water bath (22) by means of an inclined screw conveyor (24) or a sieve drum that can be immersed in a water bath (22), wherein the contact time of the cereal grains (100) with the water is between 4 and 8 min, in particular 6 min, and the temperature of the water is preferably between 15 and 25 °C, particularly preferably 20 °C.

3. V experienced according to claim 2, d ad through g ek ennz ei chn et, that the inclination of the screw conveyor (24) to the horizontal is such that it is arranged with its first inlet end (24a) in the water bath (22) and with its second outlet end (24b) outside the water bath (22).

4. Method according to claim 3, d adur ch gekennze i chnet, that the water-wetted grain kernels (100) are sieved and / or dried in a drying device (50), in particular in a rotary sieve device, before being fed to the hulling device (30), wherein the sieve drum (52) of the rotary sieve device has a mesh size in the range of preferably 300 to 600 pm, particularly preferably 500 pm, and wherein the moisture content of the grain kernels after the drying process is preferably between 4% and 8% and particularly preferably 6%.

5. Method according to any one of the preceding claims, d adu rch gek e nn zeichn et, that the grain kernels (100) are fed to the dehulling device (30) via a buffer storage tank (40) and a sensor-controlled flap arrangement (38) in batches with a substantially constant volume of grain kernels (100), wherein the flap arrangement (38) comprises a first inlet-side flap (38a) associated with the inlet (35) of the dehulling device (30) and a second outlet-side flap (38b) associated with the outlet (37) of the dehulling device (30), which can be opened and closed via a control device such that the first inlet-side flap (38a) is opened for a predetermined, preferably adjustable, duration of time, so that a predetermined volume of moistened grain kernels (100) flows from the buffer storage tank (40) into the dehulling device (30) when the outlet-side flap (38b) is closed, and both flaps (38a, 38b) during the subsequent peeling process,and after completion of the peeling process, the second outlet-side flap (38b) is opened and the peeled product is removed from the peeling device with the first inlet-side cap (38a) closed, (30) is expelled.

6. V experienced according to claim 5, d ad urchgekennzei ch net, that a material sensor (39) is arranged at the outlet (37) of the peeling device (30), with which the presence of peeled wheat kernels (100) in the area of ​​the outlet (37) can be detected, and depending on its signals the second outlet-side flap (38b) is closed and then the first inlet-side flap (38a) is opened by the control device for a predetermined period of time if no wheat kernels are detected by the material sensor (39) in the area of ​​the outlet (37).

7. Method according to one of the preceding claims, characterized in that that the rotor (34) of the peeling device (30) can be driven with a preferably variable rotational speed, wherein the rotational speed during the peeling process is in a range between 70 rpm and 150 rpm and preferably between 90 rpm and 120 rpm.

8. Method according to any one of the preceding claims, that through marked sign, that the rotor (34) of the peeling device (30) is driven at a reduced speed compared to the speed of the peeling process during filling and / or emptying of the peeling chamber (33), in particular at a speed of less than 10 rpm.

9. Method according to any one of the preceding claims, d ad u rch marked, that the broken outer shells (102) of the wheat kernels (100) separated from the kernels (104) by the heated air in the classifier (70) are introduced together with the air as an airflow (72) into a cyclone separating device (80), and in this are separated from the airflow (72) and introduced into a collection container (82), in particular a BigBag, for further processing.

10. Arrangement 1 for carrying out the method according to one of the preceding claims, comprising a cleaning device ( 10) for cleaning the wheat grains (100), A wetting device (20) downstream of the cleaning device (10) for wetting the cleaned grain kernels (100) with water, a drying device (50), in particular a rotary sieve device, for drying the grain kernels (100), a buffer storage unit (40) downstream of the drying device (50) for temporarily storing the dried grain kernels exiting the drying device (50), a peeling device (30) downstream of the buffer storage unit (40) with a rotor (34) rotating in a housing (32) at a speed preferably between 900 rpm and 1200 rpm, on which radially outwardly extending, in particular rod-shaped peeling elements (36a) are arranged, which rotate in a peeling chamber (33) defined between the inner wall of the housing and the rotor (34) and interact with complementary stationary peeling elements (36b) originating on the inside of the housing (32),a classifier (70) directly downstream of the dehulling device (30) and fluidically connected to it, in which the husks (102) separated from the surface of the outermost layer of the grain kernels (100) in the dehulling device by the dehulling elements (36a) are separated from the kernels (104) of the grain kernels (100) in an air stream of heated air, and preferably with a cyclone separator (80) in which the separated outer husks (102) can be separated from the air stream (72) and introduced into a collection container (82), in particular a big bag, for further processing.

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