Method for filling a bag with a powdery product, station for filling bags with a powdery product and bag filling installation comprising at least one such station

Abstract

The invention relates to a method for filling a bag (12) with a powdery product, which comprises: - a step of filling a buffer container (26), - a step of deaerating the powdery product contained in the buffer container (26) by sucking the air present in the powdery product with at least one suction element (40) so as to obtain a powdery product in a compact and deaerated state, - a step of transferring the powdery product in a compact and deaerated state from the buffer container (26) into the bag (12) by moving the suction element (40). Thus, according to the invention, the powdery product is deaerated before being introduced into the bag. The invention also relates to a bag filling station making it possible to implement said method as well as a bagging installation comprising at least one such filling station.

Description

[0001] The present application relates to a method for filling a bag with a powdery product, to a station for filling bags with a powdery product and to a bagging installation comprising such a bagging station.

[0002] According to one embodiment, a bagging installation comprises a bag feeding station configured to present empty bags one after the other, each with an upwardly oriented opening, a filling station configured to fill the bags one after the other, and a closing station for closing the bags.

[0003] Depending on the configuration, a filling station includes: clamps configured to grip the sides of each bag, near its upper end, in order to hold it stationary in a vertical position, its upper end being open, a vertically movable filling mouth, configured to penetrate the bag and fill it with powdered product.

[0004] Alternatively, the filling mouth is stationary and the open bag translates vertically to accommodate the lower end of the filling mouth in the bag.

[0005] Due to its fall into the bag, the powdery product contained in the bag is aerated and occupies a large volume for a given mass. Consequently, the powdery product must be deaerated in order to increase its density and reduce its volume. For this purpose, the bagging installation comprises, between the filling and closing stations, at least one deaeration station at which the powdery product is deaerated. Such a station comprises a suction element, called a deaeration tube, partly porous, connected to a vacuum pump and configured to be immersed in the powdery product. When immersed in the powdery product, the deaeration tube removes the air present in the powdery product. Alternatively, the compaction of the powdery product is obtained by means of external vibrations.

[0006] This embodiment is not satisfactory for the following reasons.

[0007] Adding a deaeration station increases the length and therefore the size of the bagging installation.

[0008] Another disadvantage is that filling and deaerating the powdered product contained in the bag generates a lot of dust which tends to settle on the outer sides of the bag and make it dirty.

[0009] Finally, each bag must be large enough to contain the aerated powdered product. At the end of the deaeration stage, the powdered product occupies a significantly smaller volume, so that the bag has an excess length that is necessary for filling but unnecessary after deaeration. This excess length leads to a significant cost per bag compared to the final volume occupied.

[0010] The present invention aims to overcome all or part of the drawbacks of the prior art. To this end, the subject of the invention is a method for filling a bag with a powdery product, said bag being temporarily immobilized in a filling station of a bagging installation and configured to contain a given mass of the powdery product. When it has the given mass, said powdery product occupies a first volume in an aerated state as well as a second volume smaller than the first volume in a compact and deaerated state.

[0011] According to the invention, the filling method comprises: a step of filling a buffer container separate from the bag, a step of deaerating the powdery product contained in the buffer container by sucking the air present in the powdery product with at least one suction element, at least partially immersed in the powdery product and in the activated state, so as to obtain a powdery product in the compact and deaerated state, a step of transferring the powdery product in the compact and deaerated state from the buffer container into the bag by moving the suction element kept activated and at least partially immersed in the powdery product, the powdery product in the compact and deaerated state being positioned in the bag, a step of releasing the powdery product by deactivating the suction element, a step of removing the suction element from the bag.

[0012] According to this method, the powdered product is compacted and deaerated before being introduced into the bag. Consequently, the bag does not need to have an excess length, like the bags of the prior art, which had to be able to contain the powdered product in an aerated state.

[0013] At a filling station in a bagging plant, it is possible to carry out the steps of deaerating the powdered product and introducing the powdered product into the bag. Therefore, the station dedicated to deaerating the powdered product in the bags can be eliminated, helping to reduce the length and size of the bagging plant.

[0014] Finally, since the deaeration step is not carried out in the bags, the risks of soiling the bags with the dust generated during deaeration are limited.

[0015] The invention also relates to a bag filling station making it possible to implement said filling method as well as a bagging installation comprising at least one such filling station.

[0016] Other characteristics and advantages will emerge from the description of the invention which follows, a description given by way of example only, with reference to the appended drawings, among which: There figure 1 is a schematic representation of a filling station at different times of a filling process illustrating an embodiment of the invention, The figure 2 is a schematic representation of a buffer container in the closed state and in the open state illustrating an embodiment of the invention, The figure 3 is a horizontal section of a buffer container illustrating an embodiment of the invention, The figure 4 is a horizontal section of a buffer container illustrating another embodiment of the invention, The figure 5 is a schematic top view of a bagging installation illustrating one embodiment of the invention, The figure 6 is a schematic front view of a filling station illustrating one embodiment of the invention.

[0017] According to one application, a bagging installation 10 is configured to fill bags 12 with powdered product.

[0018] According to an embodiment visible on the figure 5 , each bag 12 comprises two side faces 12.1, 12.2 which each have first and second side edges as well as lower and upper edges. The first side edges of the two side faces 12.1, 12.2 are connected to each other directly or by means of a gusset 12.3. The same applies to the second side edges which are connected directly or by means of a gusset 12.3. The lower edges of the two side faces 12.1, 12.2 are connected to each other before filling so as to form the bottom of the bag. The two upper edges of the two side faces 12.1, 12.2 are not connected before filling and delimit a mouth 12.4 via which the powdered product is introduced. After filling, the upper edges are connected to each other, by any suitable means (gluing, sewing or other), to close the bag.

[0019] The mouth 12.4 has a passage section. According to one configuration, when it is open, the bag 12 has a cross section (perpendicular to the first and second lateral edges) constant over its entire height (distance between the lower and upper edges) and substantially equal to the passage section of the mouth 12.4.

[0020] Each bag is sized to contain a given mass of deaerated and compacted powdered product. In the deaerated and compacted state, the powdered product occupies a compact volume smaller than the aerated volume occupied by the same mass of powdered product in the aerated state, i.e. not yet deaerated.

[0021] According to an embodiment visible on the figure 5 , a bagging installation 10 comprises, in the order of movement of the bags materialized by the arrow DD, at least one bag supply station 14, at least one filling station 16, at least one closing station 18 as well as at least one bag movement mechanism 20 configured to move the bags, one after the other, in the different stations 14, 16, 18.

[0022] The feeding and closing stations 14, 18 as well as the bag movement mechanism 20 are not further described because they may be identical to those of the prior art.

[0023] A filling station 16 comprises at least one holding mechanism 22 configured to temporarily hold each bag 12 stationary at the filling station 16, its mouth 12.4 open upwards. For example, the holding mechanism 22 may comprise clamps, configured to grip the first and second lateral edges of the bags, close to the upper edges. Alternatively, the holding mechanism 22 may comprise suction cups to separate the two lateral faces 12.1, 12.2. Of course, the invention is not limited to these embodiments for the holding mechanism 22. In operation, the holding mechanism 22 is configured to hold the bag 12 so that its mouth 12.4 has a maximum passage section.

[0024] According to an embodiment visible on the figure 1 , a filling station 16 comprises a powder product supply system 24 configured to dispense a powder product by gravity. This powder product supply system 24 comprises a supply mouth 24.1 through which the powder product to be packaged flows by gravity. According to one embodiment, the powder product supply system 24 comprises a hopper 24.2 containing the powder product, positioned above the supply mouth 24.1 and communicating with the latter, as well as a flow control system 24.3 for controlling the powder product flow between the hopper 24.2 and the supply mouth 24.1, configured to occupy a passing state in which the flow control system 24.3 allows the powder product to flow towards the supply mouth 24.1 and a closed state in which it prevents any flow towards the supply mouth 24.1.Of course, the invention is not limited to these embodiments for the powdered product supply system 24.

[0025] According to a feature of the invention, the filling station 16 comprises a buffer container 26. The latter has an upper opening 26.1 through which the powdered product is poured by gravity.

[0026] This buffer container 26 is sized so as to contain the aerated volume occupied by the powdered product of given mass.

[0027] This buffer container 26 has a horizontal cross-section very slightly smaller than the passage section of the mouth 12.4 of the bag 12 immobilized at the filling station 16. As illustrated in the figures 3 et 4 , this horizontal cross-section can be oblong with rounded ends as shown in the figure 3 or substantially rectangular as shown in the figure 4 . Whatever the embodiment, the horizontal cross-section must be included in the passage section of the mouth 12.4 of the bag 12.

[0028] According to one embodiment, the buffer container 26 has a bottom 28 and at least one side wall 30 which has a lower edge connected to the bottom 28 and an upper edge which delimits the upper opening 26.1.

[0029] For the remainder of the description, a or the wall means one or more walls connected so as to form a tube.

[0030] The buffer container 26 comprises an outlet opening 32 configured to allow the powdered product to be removed in a compact and deaerated state from the buffer container 26.

[0031] According to one configuration, the upper opening 26.1 and the outlet opening 32 are merged. In this case, the powdered product is poured into the buffer container 26 via the upper opening 26.1 and then extracted from the buffer container 26 in a compact and deaerated state also via the upper opening 26.1.

[0032] According to another preferred configuration and visible on the figures 1 , 2 And 6, the upper opening 26.1 and the outlet opening 32 are distinct, the outlet opening 32 being located at the bottom 28 and delimited by the lower edge of the side wall 30. In this case, the powdery product is poured into the buffer container 26 via the upper opening 26.1 then removed from the buffer container 26 in the compact and deaerated state via the outlet opening 32 towards an area located under the buffer container 26. According to this configuration, the holding mechanism 22 and the buffer container 26 are configured so that the bag 12 is immobilized vertically above the buffer container 26 so as to allow a transfer of the powdery product in the compact and deaerated state from the buffer container 26 to the bag following a rectilinear and vertical trajectory.

[0033] This configuration makes it possible to obtain a simple and short trajectory between the buffer container 26 and the bag 12, which limits the risks of disintegration of the powdered product in a compact and deaerated state during its transfer.

[0034] According to one embodiment, the buffer container 26 comprises at least one hatch 34 movable between a closed state in which it forms the bottom 28 and closes the outlet opening 32 and an open state in which it completely clears the outlet opening 32.

[0035] According to one arrangement, the buffer container 26 comprises two movable hatches 34, 34' configured to occupy a contiguous position, visible on the part (A) of the figure 2 , corresponding to the closed state as well as a spread position, visible on part (B) of the figure 2 , corresponding to the open state, in which the two hatches 34, 34' clear the exit opening 32.

[0036] Of course, the invention is not limited to this number of hatches 34, 34'.

[0037] According to one configuration, each hatch 34, 34' is animated by a pivoting movement between the closed and open states, as illustrated in the figure 1 .

[0038] According to another configuration, each hatch 34, 34' is animated by a translational movement between the closed and open states, as illustrated in the figures 2 And 6 .

[0039] Of course, the invention is not limited to these kinematics for the hatch(es) 34, 34'.

[0040] According to one embodiment, the side wall 30 of the buffer container 26 is slightly flared towards the outlet opening 32, as illustrated in the figure 2 . This embodiment limits the friction between the buffer container 26 and the powdered product in the compact and deaerated state when it exits via the outlet opening 32. When the outlet opening 32 is located at the bottom 28, the side wall 30 flares downwards. Alternatively, as illustrated in the figure 1 , the buffer container 26 could comprise a substantially constant horizontal cross-section over its entire height.

[0041] According to a configuration visible on the figure 2 , the bottom 28 is substantially flat. According to another configuration visible on the figure 1 , the bottom 28 comprises two inclined sides, which correspond to the two hatches 34, 34', substantially symmetrical with respect to a median plane PM, the buffer container having a height (distance between the bottom 28 and the upper opening 26.1) greater at the level of the median plane PM than at the level of the side wall 30.

[0042] According to an embodiment visible on the figure 1 , the filling station 16 comprises at least one weight measuring system 36 making it possible to measure the mass of the buffer container 26, in particular when the latter contains the powdered product.

[0043] According to a feature of the invention, the filling station 16 comprises a vacuum deaeration system 38 configured to extract the air present in the powdered product contained in the buffer container 26. Thus, unlike the prior art, the powdered product is not deaerated in the bag 12 but prior to its introduction into the bag 12 when it is contained in the buffer container 26.

[0044] The vacuum deaeration system 38 comprises at least one suction element 40 configured to be partially immersed in the powdered product. The vacuum deaeration system 38 is configured to occupy an activated state in which it generates suction at the suction element 40 and a deactivated state in which it no longer generates suction at the suction element 40.

[0045] According to one embodiment, the suction element 40 comprises at least one hollow body 42 which has a porous wall S42 separating an inner zone and an outer zone, the porous wall S42 having a porosity adapted in particular according to the powdery product so that in the activated state, when the porous wall S42 is immersed in the powdery product, the powdery product remains in the outer zone and the air present in the powdery product passes from the outer zone to the inner zone, which makes it possible to deaerate and compact the powdery product. In addition, the vacuum deaeration system 38 comprises at least one vacuum pump 44 (or any other element capable of sucking air) which communicates with the inner zone of the hollow body 42.

[0046] According to one configuration, the hollow body 42 is a cylindrical tube which comprises a first closed end 42.1 and a second end 42.2 connected by a pipe to the vacuum pump 44. According to one arrangement, the porous wall S42 extends, from the first end 42.1, over a given height H42 and does not extend to the second end 42.2. In operation, when the vacuum deaeration system 38 is in the activated state, the entire porous wall S42 is immersed in the powdered product.

[0047] According to one mode of operation, the vacuum deaeration system 38 generates a depression in the interior zone of the hollow body 42 of between 0.1 and 0.4 bar.

[0048] Of course, the invention is not limited to this embodiment for the hollow body 42. The shapes of the hollow bodies 42 and their number are determined according to the nature of the powdered product and the geometry of the buffer container 26.

[0049] For example, the hollow body 42 is a deaeration tube identical to those of the prior art. For a buffer container 26 which has the following dimensions; namely a height of between 250 and 500 mm, a width of the order of 100 mm, a length of the order of 200 mm, for a capacity of between 5 and 10 liters, and containing a powdered product such as plaster, cement, glue, milk powder or others of 10 to 150 µm in particle size, the vacuum deaeration system 38 generates a depression of the order of 0.2 bar and comprises a single deaeration tube which has the following characteristics, namely a diameter of 40 to 50 mm, a height of the order of 60 to 120 mm and a porosity of between 15 and 120 µm.

[0050] According to a feature of the invention, the filling station 16 comprises at least one movement system 46 configured to move the suction element 40 between the buffer container 26 and the bag 12 immobilized at the filling station 16. The movement system 46 is designed as a function of the trajectory followed by the suction element 40 between the buffer container 26 and the bag 12 immobilized at the filling station 16.

[0051] According to one embodiment, the movement system 46 could be a robotic arm. When the buffer container 26 is positioned directly above the bag 12 immobilized at the filling station 16, the trajectory is simplified. In this case, the trajectory is rectilinear and vertical. The movement system 46 comprises at least one linear actuator, such as a jack for example, configured to move the suction element 40 vertically.

[0052] According to one embodiment, the suction element 40 comprises at least one vibration transmitter 48 secured to the hollow body 42 and configured to make it vibrate. According to one configuration, the vibration transmitter 48 is of the ultrasonic type and emits waves between 20 kHz and several megahertz.

[0053] According to one mode of operation, each vibration emitter 48 is configured to occupy a deactivated state in which it does not emit vibrations and an activated state in which it emits vibrations.

[0054] This vibration transmitter 48 is used to promote the separation of the suction element 40 and the powdery product in a compact and deaerated state and / or to facilitate the unclogging of the porous wall S42.

[0055] According to one embodiment, the filling station 16 may comprise at least one screen positioned between the buffer container 26 and the bag 12 immobilized at the filling station 16, said screen being configured to limit the propagation towards the bag 12 of the dust potentially emitted at the buffer container 26 (during the deaeration of the powdered product).

[0056] According to an embodiment visible on the figure 6 , the filling station 16 comprises at least one unclogging enclosure 50 sized to contain the suction element 40 and equipped with at least one hatch 50.1 movable between a closed position (in a strong line on the figure 6 ) in which the hatch 50.1 closes the unclogging enclosure 50 and an open position (in dotted lines on the figure 6 ) in which it allows a suction element 40 to enter or exit the unclogging enclosure 50.

[0057] In the presence of an unclogging enclosure 50, the movement system 46 is configured to move the suction element 40 between the unclogging enclosure 50, the buffer container 26 and the bag 12 immobilized at the filling station 16.

[0058] According to one arrangement, the unclogging enclosure 50 is positioned above the buffer container 26, directly above the latter. This arrangement makes it possible to simplify the trajectory of the suction element 40, which is rectilinear and vertical.

[0059] In addition to the unclogging enclosure 50, the filling station 16 comprises a blowing system configured to blow air into the hollow body 42 in order to unclog it.

[0060] According to one embodiment, the blowing system and the vacuum pump 44 are a single reversible device configured to generate: a depression in the hollow body 42 during a step of deaeration of the powdery product or a step of displacement of the powdery product in the compact and deaerated state, or an overpressure in the hollow body 42 during an unclogging step.

[0061] According to an arrangement visible on the figure 5 , the filling station 16 comprises a first zone 52.1 which comprises the powder product supply system 24 as well as a second zone 52.2, at the level of which a bag 12 is immobilized, which comprises the suction element 40 and the possible unclogging enclosure 50, the first and second zones being offset in a horizontal plane. According to this arrangement, at least one buffer container 26 moves between the first and second zones 52.1, 52.2 so as to immobilize itself in a first position, in the first zone 52.1, in which the buffer container 26 is positioned under the powder product supply system 24, directly above the latter, as well as in a second position, in the second zone 52.2, in which the buffer container 26 is positioned above the bag 12 immobilized in the filling station 16, directly above the latter, in line with the path of the suction element 40 and below the possible unclogging enclosure 50.

[0062] According to this arrangement, the filling station 16 comprises at least one movement system 54 configured to move each buffer container 26 between the first and second zones 52.1, 52.2, more particularly between the first and second positions. According to one embodiment, the filling station 16 comprises several buffer containers 26, 26' so that first and second buffer containers 26, 26' are simultaneously immobilized respectively in the first and second zones 52.1, 52.2. In this case, the movement system 54 may be a carousel.

[0063] According to this embodiment, the first buffer container 26 immobilized in the first zone 52.1 is filled with powdered product and possibly weighed, whereas for the second buffer container 26' immobilized in the second zone 52.2, the powdered product is deaerated and then transferred in a compact and deaerated state from the buffer container 26 to the bag 12.

[0064] Of course, the invention is not limited to this arrangement. Thus, the filling station could contain only one zone and a single buffer container 26.

[0065] The filling station 16 previously described makes it possible to implement a method of filling a bag 12 temporarily immobilized in the filling station 16 with a powdered product, the bag 12 being configured to contain a given mass of the powdered product; when it has the given mass, the powdered product occupying a first volume in an aerated state as well as a second volume significantly smaller than the first volume in a compact and deaerated state.

[0066] According to an embodiment visible on the figures 1 , 5 And 6 , the process of filling a bag includes: a step of filling a buffer container 26 with the powdery product, said buffer container 26 being configured to contain a first volume of powdery product in the aerated state, as illustrated in part (A) of the figure 1 , a step of deaerating the powdery product in the buffer container 26 by sucking the air present in the powdery product with at least one suction element 40 at least partially immersed in the powdery product and in the activated state, as illustrated in part (B) of the figure 1 , so as to obtain a powdery product in a compact and deaerated state, a step of transferring the powdery product in a compact and deaerated state from the buffer container 26 into the bag 12 by moving the suction element 40 kept activated and at least partially immersed in the powdery product, as illustrated in part (C) of the figure 1 , a step of releasing the powdered product in a compact and deaerated state into the bag 12 by deactivating the suction element 40, as illustrated in part (D) of the figure 1 , a step of removing the suction element 40 from the bag 12.

[0067] During the transfer step, the powdery product in the compact and deaerated state is in the form of a compact block which remains pressed against the suction element 40 thanks to the suction phenomenon produced by the suction element 40 when it is activated. The block of powdery product being integral with the suction element 40 thanks to the suction phenomenon, it can be moved by moving the suction element 40.

[0068] Filling the powdered product into a buffer container 26 separate from the bag 12 and deaerating it in the latter makes it possible to avoid soiling the bags during the filling and deaeration step.

[0069] Another advantage is that, since the deaeration step is carried out in the filling station, the bagging installation does not include a station dedicated to deaeration, which reduces its length and size.

[0070] According to another advantage, since the powdered product is never in an aerated state in the bag 12 but only in a compact and deaerated state, it is possible to reduce the height of the bags, which contributes to reducing the production costs of the bags.

[0071] Prior to the deaeration step, the filling method may comprise a step of unclogging the suction element 40, as illustrated in part (E) of the figure 1 This unclogging step can be carried out once the suction element 40 has been deactivated and has released the bag 12. During the unclogging step, the vibration transmitter 48 is activated to emit vibrations in order to optimize the unclogging.

[0072] To promote the separation of the suction element 40 and the powdery product in a compact and deaerated state, in addition to stopping the depression, the release step includes a vibration emission phase 56, as illustrated in part (D) of the figure 1 , as soon as the powdery product in a compact and deaerated state is positioned in the bag 12. As a variant, the suction element 40 can generate a slight overpressure.

[0073] According to a mode of operation visible on the figure 5 , the filling step is carried out in a first zone 52.1 and the deaeration and transfer steps are carried out in a second zone 52.2. In this case, the filling method may comprise a step of moving the buffer container 26 from the first zone 52.1 to the second zone 52.2. Thus, it is possible to carry out the step of filling a first buffer container 26 simultaneously with a step of deaerating the powdered product in a second buffer container 26', which contributes to increasing the bagging rate.

Claims

1. Method for filling a bag (12) with a powdery product, said bag (12) being temporarily immobilized in a filling station (16) of a bagging installation (10) and configured to contain a given mass of the powdery product, when it has the given mass, said powdery product occupying a first volume in an aerated state as well as a second volume smaller than the first volume in a compact and deaerated state; characterized in thatthe filling method comprises: - a step of filling a buffer container (26) separate from the bag (12), - a step of deaerating the powdery product contained in the buffer container (26) by sucking the air present in the powdery product with at least one suction element (40), at least partially immersed in the powdery product and in the activated state, so as to obtain a powdery product in the compact and deaerated state, - a step of transferring the powdery product in the compact and deaerated state from the buffer container (26) into the bag (12) by moving the suction element (40) kept activated and at least partially immersed in the powdery product, - the powdery product in the compact and deaerated state being positioned in the bag (12), a step of releasing the powdery product by deactivating the suction element (40), - a step of exiting the suction element (40) of the bag (12).

2. Method for filling a bag (12) according to the preceding claim, characterized in that the step of filling the buffer container (26) consists of pouring by gravity a first volume of powdered product into the buffer container (26).

3. Method for filling a bag (12) according to one of the preceding claims, characterized in that the release step comprises a vibration emission phase (56) to promote the separation of the suction element (40) and the powdery product in a compact and deaerated state.

4. Method for filling a bag (12) according to one of the preceding claims, characterized in that , prior to the deaeration step, the filling method comprises a step of unclogging the suction element (40).

5. Method for filling a bag (12) according to one of the preceding claims, characterized in thatthe filling step is carried out in a first zone (52.1) and the deaeration and transfer steps are carried out in a second zone (52.2) and in that the filling method comprises a step of moving the buffer container (26) from the first zone (52.1) to the second zone (52.2).

6. Bag filling station allowing the implementation of the filling method according to one of the preceding claims, said filling station comprising at least one holding mechanism (22) configured to temporarily hold each bag (12) stationary as well as a powdered product supply system (24); characterized in thatthe filling station comprises: - a buffer container (26) separate from the bag (12) and configured to contain a first volume of powdered product in the aerated state, - a vacuum deaeration system (38) comprising at least one suction element (40) configured to be partially immersed in the powdered product contained in the buffer container (26), said vacuum deaeration system (38) being configured to occupy an activated state in which it generates suction at the suction element (40) and a deactivated state in which it no longer generates suction at the suction element (40), - at least one movement system (46) configured to move the suction element (40) between the buffer container (26) and the bag (12).

7. Bag filling station according to the preceding claim, characterized in that , in at least one position, the buffer container (26) is positioned above the bag (12) and directly above the latter.

8. Bag filling station according to one of claims 6 to 7, characterized in that the suction element (40) comprises at least one vibration transmitter (48) secured to the hollow body (42) and configured to make it vibrate.

9. Bag filling station according to one of claims 6 to 8, characterized in that it comprises a first zone (52.1) which includes the powdered product supply system (24), a second zone (52.2) offset in a horizontal plane relative to the first zone (52.1) and at the level of which each bag (12) is immobilized, as well as at least one movement system (54) configured to move each buffer container (26) between the first and second zones (52.1, 52.2).

10. Bag filling station according to the preceding claim, characterized in thatit comprises several buffer containers (26, 26') such that first and second buffer containers (26, 26') are simultaneously immobilized respectively in the first and second zones (52.1, 52.2).

11. Bag filling station according to one of claims 6 to 10, characterized in that it comprises at least one unclogging enclosure (50) configured to contain the suction element (40) and allow it to enter or exit.

12. Bag filling station according to one of claims 6 to 11, characterized in that it comprises at least one weight measuring system (36) for measuring the mass of the buffer container (26).

13. Bag filling station according to one of claims 6 to 12, characterized in thatthe buffer container (26) comprises a bottom (28), at least one side wall (30) which has a lower edge connected to the bottom (28) and an upper edge, which delimits an upper opening (26.1) via which the powdery product is poured, as well as an outlet opening (32) configured to allow the powdery product to be removed in a compact and deaerated state from the buffer container (26), the outlet opening (32) being located at the bottom (28) and delimited by the lower edge of the side wall (30).

14. Bag filling station according to the preceding claim, characterized in that the buffer container (26) comprises at least one hatch (34) movable between a closed state in which it forms the bottom (28) and closes the outlet opening (32) and an open state in which it completely clears the outlet opening (32).

15. Bagging installation comprising at least one filling station according to one of claims 6 to 14.

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