EP3010812A1

EP3010812A1 - Packing machine and method

Info

Publication number: EP3010812A1
Application number: EP14736659.5A
Authority: EP
Inventors: Uwe Breulmann
Original assignee: Haver and Boecker OHG
Current assignee: Haver and Boecker OHG
Priority date: 2013-06-17
Filing date: 2014-06-17
Publication date: 2016-04-27
Anticipated expiration: 2034-06-17
Also published as: CN105452110B; EP3010812B1; DE102013010048A1; ES2638215T3; US20160122042A1; CN105452110A; BR112015031723A2; US10173794B2; WO2014202613A1; BR112015031723B1

Abstract

The invention relates to a packing machine and a method for filling open bags with dust-forming products such as bulk materials by means of a filling process. The filling process is controlled in dependence on weight by means of a control device and a weighing device. Product is discharged from a product supply by means of a metering element and is introduced into an open bag attached for the filling process through a filling nozzle. The filling nozzle is connected to a collecting container by means of such a flow connection so that a pressure surge occurring during the filling process in order to transfer the displacement air contained in the open bag and surrounding the dust-forming product into the collecting container is used to hold and calm the displacement air in the collecting container and to at least partially deposit a dust fraction of the displacement air in the collecting container as a deposited product.

Description

Packing machine and process

Besehreibung

The present invention relates to a packing machine and a method for filling dusty products such as bulk goods in open sacks. Such packing machines can be supplied with prefabricated open sacks or the open sacks are produced continuously or discontinuously in the packing machine itself or in an upstream device. Packing machines, in which open sacks are formed from tubular films, are also called Form-Fill-Seal (FFS) systems.

In general, in packaging machines for filling bulk materials in open-sacks, the bulk material to be filled is taken from a product supply and introduced through a filler neck into the open sack which is attached for filling. In the filling process, air escapes from the open bag to be filled, whereby dusty product is also entrained. In order to avoid contamination of the environment, therefore, a suction takes place, wherein the extracted air is supplied to a dust filter. Such dust filters usually consist of depth filters, in which often multi-layered fiber filters are arranged one above the other. If the bulk material to be filled is changed in such packing machines, then different material accumulates in the depth filter, so that no clean-sorted material is recovered when cleaning the dust filter, but a mixed product, which must be discarded.

In order to at least partially be able to reuse the extracted bulk material fraction in packaging machines, EP 1 368 231 B1 discloses a bagging plant for filling dusty bulk goods in bags formed from tubular film, in which air sucked out of the surroundings of the filling funnel first passes through a suction line is transported and fed to a separator. The separator has a cyclone. That with the

Separator separated product is returned to the product container. The extracted air is fed to the dust filter. The load of the dust filter is reduced and the

Material consumption lowered.

A disadvantage of such a device is that constantly large amounts of ambient air from the environment of the hopper must be extracted. This requires a high energy requirement. In addition, the equipment required is large, since large amounts of exhaust air must be processed.

It is therefore the object of the present invention to provide an efficient packaging machine and an efficient method for filling dusty products in open-mouth bags, whereby less effort is required.

This object is achieved by a device having the features of claim 1 and by a method having the features of claim 18. Preferred developments of the invention are the subject of the dependent claims. Further advantages and features of the present invention will become apparent from the general

Description and the description of the embodiments.

The packing machine according to the invention is used for filling dusty products such as bulk materials in open sacks by means of at least one filling operation. The packing machine comprises a control device and a weighing device for weight-dependent control of the filling process. It is a product supply and at least one metering z. B. provided for conveying the product. The product passes through a filler neck in the prepared for the filling process or appended offensive bag. In this case, the filler neck is connected to a collecting container via at least one such flow connection, that a pressure surge occurring during a filling operation is used for the transfer of at least part of a introduced into the open bag and dusting product comprising displacement air into the sump to in the sump in a filling process out of the open bag displaced and the dusty Take product contained displacement air and calm and deposit a dust content of the displacement air at least partially in the collection container as a deposited product. The packing machine according to the invention has many advantages. A considerable advantage of the packing machine according to the invention is that the expenditure on equipment can be reduced. Optionally, no dedusting is necessary because the displaced from the open bag during the filling air flows into a collecting container, where the displacement air can calm, so that the

Dust or the dusty entrained product can store in the sump. As a result, a recovery of the entrained dusty product is made possible in a simple manner without special equipment expense. If necessary, the sump can be emptied to allow recovery of the dusting product.

The displacement air passes in particular passively and preferably substantially without and particularly preferably without any further use of energy into the collecting container, where a substantial part of the dust content in the displacement air settles and settles. The displacement air is transported via the pressure surge generated during the filling process.

The fact that the bulk material or the product with high

Speed is introduced into the open sack, there is an overpressure in the form of a pressure surge, the air in the open sack already possibly present together with air and a certain amount of dust relatively quickly and

possibly displaced even abruptly. Due to the local overpressure, the escaping displacement air is passively pumped into the collecting space, where the dust content can settle.

Preferably, the sump has a flow opening or channel to the environment. As a result, the displacement air entering the collecting container from the open sack can displace the air present there to the outside. To possibly existing

To retain dust particles, a dust filter or the like may be provided at the flow opening to the environment. In a simple embodiment, the sump could be formed by at least one upwardly extending tube. The tube could be provided with a controllable closure, which optionally supplies the settled product directly to the open mouth to be filled at a lower engine power or z. B. the next open bag to be filled. It is also possible that the reservoir extends annularly in particular around the upper part of the filler neck completely or partially around.

Particularly preferred is the collection container with a

downstream product conveyor connected to the in the

Siphon product deposited by means of the downstream product conveyor. In particular, the collecting container is connected to the downstream product conveyor via at least one line. Preferably, the sump is disposed between the filler neck and a product conveyor.

In preferred developments, an intermediate container is provided. The metering device preferably conveys the product from the product supply into the intermediate container. The intermediate container is preferably equipped with a controllable closure unit. Preferably, the intermediate container is a filler neck

downstream.

By opening the closure unit, the product received in the intermediate container can in particular be controlled

Filler be supplied.

The or at least one product conveyor is preferred

provided intermittently a part of the deposited

Remove product from the sump and in particular the intermediate container to feed again. Operation of the

Product conveyor can be intermittent. It is also possible that the product conveyor is operated only as required or when needed. It is preferred that the product conveyor is operated periodically. For example, the

Product conveyors are operated after each filling operation or after every second, third or fourth filling operation or any other number of filling operations, in the meantime, in The product deposited in the collecting container can be returned to the intermediate container or, for example, also to the product supply. It is also possible that the distances between the operation of the

Product conveyor are irregular. It is also possible, the product conveyor continuously or clocked during a

To operate filling.

In particular, the product deposited in the collecting container is fed to the intermediate container with the product conveyor.

In preferred developments, at least one sensor is provided on the product conveyor and / or the collecting container, which sensor detects a measure of the amount of deposited product. This sensor can be any sensor.

For example, it is possible for a separate weight sensor or fill level sensor to be provided on the collecting container which emits a signal at least when the product quantity stored there reaches or exceeds a predetermined level. But it is also possible that the weighing device is used to determine a measure of the amount of deposited product. This is for example possible if the sump is weighed by the weighing device, so that after completion

Filling process a new tare weight is determined, from which also the deposited quantity can be deduced.

The product conveyor is preferably connected to the intermediate container to supply the deposited product to the intermediate container.

The collecting container can in particular directly with the

Be connected filler, so that the flow connection is predominantly or completely formed by a transfer opening between the filler neck and the sump. The transfer opening is in any case preferably dimensioned so large that the pressure surge occurring during the filling process ensures sufficient transfer of the displacement air.

The flow connection may also include or be formed substantially from a flow channel. Preferably a flow channel a ratio of a free and in particular maximum free diameter of the flow channel to a length of the flow channel of greater than 1:20. In particular, this ratio is greater than 1:10 and preferably greater than 1: 5. If a flow channel comprises a plurality of subchannels, then a free diameter of the flow channel is understood to be a fluidically equivalent diameter. The aerodynamically equivalent diameter is the sum of all

Partial channels calculated and not only from the diameter of a sub-channel.

If the flow connection is formed by a flow channel, a ratio of a free cross section of the flow channel to a free cross section of the filler neck is in particular greater than 1: 8 and preferably greater than 1: 6 and particularly preferably greater than 1: 4. If one flow channel several

Partial channels includes, so is understood by a free cross-section of the flow channel a flow-technically equivalent cross-section. An aerodynamically equivalent cross section is formed or calculated from the sum of all subchannels and not only from the cross section of a subchannel.

The collecting container has a calming volume. Particularly preferably, the ratio of a volume of an offensive bag to be filled to the settling volume is less than 20: 1 and preferably less than 10: 1 and particularly preferably less than 5: 1. The calming volume of the collecting container can

be resizable.

In all embodiments, a dedusting device is preferably provided. The dedusting device is preferably provided for dedusting in the outer region of the filler neck to dust the ambient air on the outside of the hanging on the filler neck opening bag. This can be sucked through leaks escaping dust to meet the required or desired environmental impact. For example, the filler neck is preferably made telescopic, so that leaks may occur at the junction. In any case, the dedusting facility can lenth be executed weaker than in the prior art, since only a much lower proportion of air must be dedusted, since the pressure surge in the sump can degrade. The venting performance of the dedusting device can be halved, quartered or even reduced to 1/8 or more without sacrificing cleanliness.

In preferred developments, the filler neck has a central product supply and at least one in particular lateral air discharge. By such a configuration, the filler neck is used both for supplying the product and for discharging the air contained in a simple manner. In this case, the filler neck is connected on the one hand to the supplied product and on the other hand to the sump.

In particularly preferred developments of the invention, the collecting container is connected to the environment via at least one tube device or a displacement container. In particular, the particular extends as a tube or hose

maintained pipe device upright. The tube may be vertical, but may also be provided inclined to the vertical. The tube may be formed linear, but may also have bends and / or turns. The tube limits

Displacement. Preferably, the displacement volume is at least one-tenth and in particular at least a quarter of the volume of the collecting container, wherein in principle applies: the larger the better. It is possible that the tube is one

Displacement volume, which substantially corresponds to the volume of an openable bag to be filled. At the conclusion to

Surrounding the tube is a suitable closure and in particular a filter and preferably a simple filter is provided. Such a filter also avoids that foreign objects, dust or other materials from the environment in the interior of the

Collect collection container. Such a filter can also as

Wire mesh or wire mesh or the like may be provided.

A tube extending upright from the sump has the advantage of providing a displacement volume. During the filling process dusty air enters the Collecting container, so this dust-containing air displaces the existing air in the displacement volume in the upright extending tube to the outside. However, this air has no dusty product or at least almost no dusty product, so that the environment remains largely clean. Residual dust particles are retained by the mentioned filter. In the meantime, between two filling operations, the dust-containing air in the upright pipe as well as in the collecting tank can calm down so that the dust content contained settles downwards. Due to the upright orientation of the tube, the dust portion falls down and / or slides down the tube. The flow resistance of the filter can be reduced by actively discharging the air to prevent pressure build-up and escape of air through the filling system.

In all embodiments, the control device is in particular configured and designed to control the metering device in dependence on the signals of the weighing device. Depending on the configuration, it is possible to carry out the filling process as a gross weighing method or as a net weighing method. In both cases, it is possible that the metering is initially operated time-controlled or volumetrically and only then works weight controlled, for example in the fine stream.

Preferably, the weighing device is adapted to weigh a filling system. The filling system comprises at least the filler neck, so that a bag attached thereto is also weighed in order to carry out a filling process in the gross method. Such an embodiment offers considerable advantages, since the product filled in the open bag is weighed directly, so that accurate weight control is made possible. It is possible that the filling system also includes the collecting container, so that the collecting container is weighed with. In such an embodiment, the first filling operation causes dust-containing product to settle in the collecting container during the filling process and after the end of the filling process, which product is weighed. As a result, a new tare weight can be determined and used for the second filling process, so that the second filling process begins Weight accuracy can be significantly increased. For the first filling process, an empirical value for correcting the filled quantity can be used.

In preferred embodiments, the collecting container is received decoupled from the filler neck. For example, between the collecting container and the filler neck, a flexible hose or the like may be provided, which leads to a weight decoupling of the collecting container from the filler neck.

Also possible is a telescopic connection, in which two

Telescope-like parts are included in each other and the

Lead air flow. In such an embodiment, the weight is determined exactly at each filling in the gross method. Extruded air displaced from the open bag and containing the product will not cause any weight degradation as the product portion in the collection box is picked up separately and not weighed.

In preferred embodiments, the control device is set up and designed to time the metering or

volume controlled operate. As a result, a considerable part of the product to be filled during a filling process can first be collected in the intermediate container. By opening a controllable closure unit on the intermediate container, the contents of the intermediate container can be emptied through the filler neck. As long as the controllable closure unit is closed, for example, even before attaching a new offensive bag product can be promoted in the intermediate container, so that the filling process can be accelerated overall. For example, 80% or 90% of the total quantity provided may be in the

Are collected intermediate container, so that after opening the controllable closure unit only a fine flow in the

Offensack must be routed.

For this purpose, the exact weight of the pre-filled in the intermediate container product must not be known, since empirical values of the density can be deduced.

In all embodiments, it is possible and preferred that the intermediate container is firmly connected to the product supply. Of the Intermediate tank is preferably designed only for receiving a portion of the amount of product to be filled during a filling operation. For example, the product supply can have only 80%, 90% or even 50% of the volume occupied by a ready-filled open sack. In particular, the intermediate container is not part of the weighed system or the filling system.

But it is also possible and preferred that the weighing device is adapted to weigh the intermediate container to

in particular to carry out a filling process in the net method. In this embodiment, the weighed system or the

Fill system practically consist only of the intermediate container. In such an embodiment, first the complete

intended amount of the product conveyed into the intermediate container. Subsequently, after the opening of the controllable closure unit, the contents of the intermediate container are emptied through the filler neck into the attached open sack.

In such an embodiment, after the end of the filling process, the deposited product as a whole or a part of the deposited product is conveyed from the collecting container into the intermediate container. This amount is registered by the weighing device, so that an exact amount is weighed again at the next weighing process. In the weighing process according to the net method, the settling product quantity in the intermediate container can also be taken into account in each case. In the case of a first filling process, empirical values and, in the case of further filling processes, the previous preceding weight value or an average value can be used.

In all embodiments, it is preferred that at least one blowing device is provided in order to inflate the opening bag at the beginning of the filling process. Although with such a blower first air is introduced into the open-sack, which must be retrieved later again, such a method offers significant advantages, such as drape on the

Sack wall can be avoided. Such a drape may result in lighter materials that do not fully deploy the sack and so overall only less dusty Product can be filled into the open bag, so there is a risk that the open bag overflows or can not absorb the entire product quantity. Inflating the offensive bag before starting the filling process helps to avoid such problems.

In all embodiments, it is preferred that the filler neck is provided telescopically and in an extended

Filling position and a retracted take-off position can be brought. By a telescoping filler neck, it is possible that the filler neck is retracted to decrease the filled offensive bag, for example, so that no dust-laden air escapes when removing the filled bag. Conversely, can be extended to attach a Offensack the filler neck.

Naturally, a small gap is provided between the telescoping parts of a telescoping filling nozzle, through which dust-laden air can escape to the outside. To one

To prevent or reduce contamination of the environment, a dedusting device is preferably provided in such embodiments on the filler neck. However, the capacity of such dedusting can be considerably smaller than in conventional systems, since only a relatively small air flow with a low dust load must be dedusted. The dust content contained here can be discarded because it is only a small mass fraction. It is also conceivable that there is a post-treatment of the discharged air flow. In principle, such is usually worthwhile

Aftertreatment but only if for several filler

at the same time a treatment takes place.

In all embodiments, it is preferred that at least one compression device is provided. Such

Compressor may act on the bag during the filling process and / or after the end of the filling process to densify the bottled product present therein. For example, it is possible that a compression device is designed as a floor vibrator, which can be moved from below to the open bag. The Bodenrüttler can be temporarily introduced from below during a filling process to the Offensack to the to compact already bottled material. It is also possible that the bottom vibrator is brought to the open bag only after the end of the filling process or during the entire filling process, for example when filling in the net process.

Preferably, it is also possible that a vacuum lance or vibrating bottle or the like from above through the filler neck dips into a trailing open bag to compact the product present there.

It is also possible that a Seitenrüttler or a

Side knocker is used, which z. B. is laterally pivoted to the bag.

The inventive method is used for filling dusty and especially slightly dusty products such as bulk materials in open-mouth bags. For example, it may be used to fill maltodextrin and other dust-prone foods or other products where product purity is desired. The filling takes place by means of a filling process at one

Packing machine. The filling process is controlled by weight with a control device and a weighing device. With at least one metering product is metered controlled from a product supply product and z. B. promoted. The product passes through a filler neck in the attached open bag. The pressure surge occurring during a filling process is used in the

Open bag containing and dusting product comprehensive

Displacement air via a flow connection from the filler neck into a collecting over and calm so that the dust content of the displacement air settles at least partially in the collecting container as a deposited product. The method according to the invention also has many advantages, as it is an effective way of filling and filling in a simple manner

Reuse of the deposited product allowed.

Preferably, the deposited product is removed intermittently. The filling process, depending on the design of the

Packing machine according to the gross method or the net method. In all embodiments, a portion of the amount to be filled could first be filled into an intermediate container. Further advantages and features of the present invention will become apparent from the exemplary embodiments, which are explained below with reference to the attached figures:

In the figures show:

Fig. 1 is a highly schematic side view of a

Packing machine according to the invention;

Fig. 2 is a highly schematic cross section through a

Filler neck of the packing machine of Fig. 1;

Fig. 3, the filler neck of Figure 2 rotated by 90 °.

Fig. 4 is a highly schematic cross-section through a

another filler neck for a packaging machine according to the invention; and

5 is an overall view of the packing machine of FIG. 1.

FIG. 1 shows a highly schematic side view of a packaging machine 1 according to the invention, which has a frame 40. The packing machine 1 is used to fill open-top open sacks 3 with dusty products 2 or a dusting bulk material.

The packaging machine 1 can be supplied prefabricated open sacks 3. It is also possible and preferred that the packing machine 1 is designed as a so-called FFS system and in one

integrated or upstream device open sacks 3 produced from a continuous tubular film web or from a flat film web. The direct production of the open sacks 3 on the packaging machine 1 has the advantage that in each case an optimal length of the open sacks 3 can be generated, even in the

ongoing operation can be adjusted.

A to be filled open bag 3 is to the filler neck 11th

Packing machine 1 attached before the filling process starts Control device 4 is used to control the filling process and the operation of the packaging machine. 1

Above the frame 40 of the packing machine 1, a product supply 5 or a silo is provided, which here stores a larger amount of product 2 to be filled. The amount of product in the

Product supply 5 is sufficient here for the filling of a plurality of open sacks 3. The product supply 5 is followed by at least one metering device 6, which product 2 away from the product supply 5 and promotes here to the intermediate container 7.

In the embodiment shown here, two metering members 6 are provided, both of which are each formed here as a screw conveyor. One of the metering 6 is used for the coarse flow, while the other and here in the drawing behind and therefore not visible second metering 6 is used to promote the fine flow. By dividing the product stream into a coarse stream and a fine stream, better and more accurate weight production is achieved. It is also conceivable only a screw that works at different speeds.

But it is also possible to use other dosing.

For example, rotary valves, conveyor turbines, air conveyors or other dosing and metering devices for metering and transport of the product 2 can be used.

The metering 6 and the metering 6 is here the

Intermediate tank 7 downstream, which serves to receive a portion 9 of the amount to be filled 10 here. Here is the volume of the intermediate container 7 or the volume used

Between container 7 so dimensioned that it is smaller than the volume of a filled in an open bag 3 amount 10. In the intermediate container is here z. B. promoted the coarse flow rate.

The intermediate container 7 has at the lower end to a closure unit 8, which is controllable by the control device 4. For example, a closure flap can be used there. But it is also possible to use a shutter, a pinch valve or other closure unit.

The intermediate container 7 of the filler neck 11 is arranged downstream, which is telescopic here to allow lowering into the filling position and lifting in the removal position.

The filler neck 11 is part of the weighed system or the filling system 13, so that the appended to the filler neck 11 bag 3 is weighed in a weighing operation with the weighing device 12. This allows a filling process according to the gross method, in which after deduction of the known weights of the

Filling and the other components of the filling system the previously filled weight of the product 2 remains in the open bag 3 as a result of measurement. This allows accurate control of the weight being filled.

In Figure 1, the filler neck 11 in the filling position 20th

shown, in which the filler neck 11 is inserted from above into the open offense bag 3.

Before the beginning of the filling process, air is blown from above into the open-mouth bag 3 with the blowing device 24 in order to inflate the bag completely and essentially without wrinkles. As a result, the maximum volume for the product 2 to be filled is available.

The filler neck 11 leads the product 2 brought up from above down into the open sack 3. In addition, the

Filler 11 next to the central product feed side

Air discharges 19, through which the displaced during the filling process from the open-mouth bag 3 via the flow connection 21 air or displacement air in the settling volume 15 and the displacement volume 27 is derived. The collecting container 14 is here via a flexible hose as a flow channel 33rd

weight-decoupled from the filler neck 11.

The flow connection 21 with the flow channel 33 is dimensioned such that the displacement air from the bag 3 passively occurring through the pressure surge occurring during the filling process is automatically transferred to the collection container 14. This means that the flow resistance is so low that a passive transmission and transfer of the displacement air is ensured in the sump 14. The dimensions of the

Flow connection 21 are chosen so that the flow resistance is passively overcome by the pressure surge occurring during filling of the product in the open-sack. An active promotion is not necessary. This saves a lot of energy.

The cross section of the flow channel 33 is preferably greater than 1/4 and in particular greater than half the cross section of the filler neck 11. The cross section of the flow channel 33 is particularly preferably about as large as a cross section of the

Filler and can also be larger. Preferably, a width 21a of the flow connection is about as large as a width IIa of the filler neck. The width 21a is preferably greater than 1/4 of the width IIa of the filler neck.

In particular, the width 21a of the flow connection is between about 1/2 of the width of the central product supply 18a and the width IIa of the filler neck and 2 times the width of the central product supply 18a or the width IIa of the filler neck.

Preferably, the flow channel 33 is made as short as possible to minimize flow losses.

The specified dimensions ensure a reliable and passive promotion of the displacement air in the sump. As a result, a large part of the entrained in the displacement bulk material can be recovered sorted and continue to be used. In addition, the energy demand for the sinks

Dedusting.

The flow channel 33 preferably drops steeply from the separation opening in the direction of the collection container 14, in order to reduce the accumulation of product in the flow channel, or in the

Derive collecting tank 14. When the packing machine 1 is provided for filling by a net method, the intermediate container 7 is weighed separately. Then can be used for the flow connection 21 as a flow channel 33, a rigid tube or a flexible hose, as a weight decoupling at this point no longer

is required.

The sump 14 is only of its size here

schematically drawn and has a calming volume 15 for the displaced from the openable bag 3 to be filled air volume.

In the filling of dusty products 2 but also comes with the displaced from the open-air bag 3 air a significant

Dust with into the sump 14 inside. There, the displaced air calms, so that the product contained in the air can settle into the collecting container 14.

It is possible that the collecting container 14 at the lower end has a controllable closure 23, which can be opened automatically or manually if necessary. But it is also possible that the collecting container 14 is formed open at the bottom, so that the collecting container 14 opens into the line 34 without further closure.

At the lower end of the collecting container 14, the deposited product collects. The deposited product 16 may be drained from the sump 14 as needed or at regular intervals. Here serves to derive the deposited product 16, a product conveyor 17. The product conveyor 17 may be designed basically arbitrary. For example, it is possible that in the conduit 34, for example, a flexible screw is arranged, which directs the deposited product 16 through the line 34 up here and finally back into the intermediate container 7. However, any other type of product conveyor is also possible. The product conveyor 17 is not operated continuously, but preferably at periodic or irregular intervals. For example, in or on the collecting container 14, a sensor may be provided which detects a measure of the amount of deposited product and when exceeding a predetermined value of the control device 4 is a signal, so that the control device 4 ensures that a part or the entire deposited product 16 is conveyed away.

The collecting container 14 is connected via a pipe 25 with the environment 26 in connection. Within the tube 25, a displacement volume 27 is present. The displacement volume 27 is displaced out of the tube 25 to the outside into the environment when the air displaced from the open bag 3 passes into the collecting container 14. Since the air in the displacement volume 27 has time to settle, the dusty product settles there and is collected on the bottom of the collection container 14.

The settling volume 15 and / or the displacement volume 27 can depend on the bag volumes to be filled and / or the floating behavior of the dusting product

be made variable in size.

In order to prevent the entry of foreign substances from the outside and, if necessary, any remaining dust in the displacement air can not escape to the outside, a filter 28 may be provided at the end of the tube 25.

At the intermediate container 7, a sensor 37 may be present for the level of the product 2 filled there. This allows a volume-controlled pre-filling of the intermediate container 7 for the coarse flow.

Since here from the product supply 5 is first conveyed into the intermediate container 7 and only then into the open bag 3, the respective product drop height is relatively low, so that only a small amount of air is added to the product 2. That makes for one

faster filling process.

At periodic intervals during the filling process or after the end of the filling process, the compression device 30, which is designed here as Bodenrüttler 31, from below to the

Sack bottom are introduced to compress existing there in the open-3 bag 2 product. Figure 2 shows a schematic cross section of the filler neck, which is used for example in the packing machine 1 of Figure 1. At the filler neck 11 here is an open bag 3 is shown attached. From above, the product stream 36 reaches down into the open sack 3. The introduction of the product stream 36 takes place in a central section or along the

central product supply 18. At lateral areas here are 19 hereby air discharge lines provided through which the displaced from the open bag air is derived.

In all cases, an open-mouth bag is received with its open-topped end close to the filler neck 11 in order to avoid the escape of dust-laden air to the outside.

The derived dust-containing air is guided in the lateral air discharges 19 and in the collecting container 14th

initiated. From the open bag 3 exiting air 35 is indicated by an arrow.

At the lower end of the filler neck 11 shutter flaps 29 are located, which allow at least one trickle-tight closure of the filler neck 11 to ensure after the end of the filling process a sack change without contamination of the packing machine by Rieselgut.

In Fig. 2, the dimensions IIa, 18a and 21a are shown relative to each other in this preferred embodiment. The width 21a of the flow connection is here slightly larger than the width IIa of the filler neck, which is greater than the width 18a. Due to the generous dimensions of the dimensions and

Cross sections will be an efficient passive promotion of

Displacement air achieved.

FIG. 3 shows another exemplary embodiment of a cross section of the filler neck 11 for the packaging machine 1 according to FIG. 1.

The filler neck 11 is firmly connected to the sump 14, so that in addition to the filler neck 11 and the sump 14 is part of the filling system 13 and the weighed system. The means that in a filling process settling product 16 is weighed in gross weighing with the collecting container 14. This settling product quantity 16 can in principle lead to a systematic measurement error or weight error of the

filled open sacks, if not previously considered. Therefore, in the case of a first filling process, an empirical value for the expected settling product quantity 16 is set, and in the case of the following filling operations, the measured values which result after the acceptance of a filled open bag 3 are used. The deposited product 16 can be determined and in the following filling process, a corresponding amount more is filled in the open bag 3 after zeroing.

In Figure 3, the telescoping filler neck 11 can be seen.

Between the telescoping parts of the filler neck, a gap 39 can be seen, which is shown here greatly simplified. In order to prevent any escaping dust from entering the environment, dedusting 22 is provided there. For the dedusting only relatively little air is sucked off, so that the dedusting can be made considerably smaller than in the prior art.

The displaced from the open-mouth bag 3 during the filling and dust-laden air is introduced via the lateral air discharge lines 19 along the air flow 35 via the flow connection 21 into the collecting container 14. The collecting container 14 is connected to the environment 26 via a pipe 25 and a filter 28 at the end of the pipe 25.

The width 21a of the flow connection preferably corresponds to the contact surface between the filler neck 11 and the collecting container 14. Here, the filler neck 11 has a width IIa which is greater than the width 18a, which in turn is greater than the width 21a of the flow connection. The width 21a of

Flow connection here is greater than 1/4 or even 1/2 of the width of the filler neck IIa. The same applies to the flow cross sections, so that the flow cross section of the

Flow connection is greater than 1/5 and preferably greater than 1/3 or 1/2 of the flow cross-section of the filler neck 11. In the sump 14, a calming volume 15 is present. The air introduced there calms down and the containing product portion collects as a settled product 16 at the bottom of the collecting container 14. The settled product 16 can be discharged through a connected line. If necessary, a controllable closure 23 at the bottom of the

Collection container 14 is provided.

FIG. 4 shows a further embodiment of a filler neck 11 for a packaging machine according to FIG. 1. Here, the filler neck is weighed together with an attached bag 3 in gross method.

While the filler neck 11 is weighed via a weighing device 12, a weighing device is also provided as a sensor 38 on the collecting container 14. The weight sensor 38 detects the weight of the collecting container 14, so that the amount of deposited

Product 16 is detectable. In order to decouple the collecting container 14 by weight from the filler neck 11, a flexible hose is provided as a flow channel 33 between the filler neck 11 and the collecting container 14. The flexible hose may extend over the entire length or only a portion. Again, the conditions mentioned for the dimensions and flow cross sections apply.

In turn, a tube 25 with a displacement volume 27 can be provided on the collecting container 14. The end is again provided with a filter 28. If the sump 14 is sized large enough, it may be possible to dispense with the tube 25.

In addition, a vacuum lance 32 is shown as a compression device 30, which can dip during the filling process or after the end of the filling process from above into the open bag 3 to vent the interior of the open bag 3.

Figure 5 shows an approximately to scale side view of an embodiment of a packaging machine 1 according to the invention, in which above the frame 40, a product supply 5 is provided, which is followed by a metering 6. The metering 6 promotes the product in an intermediate container 7, from which the product. 2 is passed through the filler neck 11 in an attached bag 3 on.

A collecting container 14 serves to calm the displaced from the bag 3 during the filling air, over the

Flow connection 21 into the collecting container 14 passes. In the collecting container 14, the containing product settles at the bottom of the collecting container.

The volume of the collecting container 14 including the volume of the flow channel and the displacement volume is preferably greater than 1/10 and in particular greater than 1/6 or 1/4 of the volume 3a of the offset sack 3. The ratio can also be 1: 2 or greater. In particular, the volume can also be greater than the volume 3a of the open sack.

About a flexible hose 41 as line 34 is the

sold product 16 promoted if necessary by the product conveyor and here the collection container 7 fed again.

Here it is possible that the intermediate container 7 is weighed separately with a weighing device 12 ^λ , so that a filling in the net method is made possible. In the process, during filling, the quantity 10 to be filled is first of all weight-collected in the intermediate container 7 and then into the open-mouth bag 3

initiated.

It is also possible that only a portion of the amount to be filled 10 is stored in the intermediate container 7 and the

Filler 11 is weighed via a weighing device 12, so that a filling in the gross procedure takes place.

In all embodiments according to a gross method, it is also possible to dispense with an intermediate container 7. Then, for example, filled by the metering 6 directly into an open bag 3.

Overall, the invention has considerable advantages. Due to the fact that the air displaced out of the open sack 3 during the filling in a collection container 14 is passed, which has a calming volume 15 and is preferably connected via a pipe 25 with a displacement volume 27 with the environment 26, the most essential part of the product contained in the discharged air can be recovered sorted. Sufficient time is available in the collecting container 14, so that the dust content contained in the air settles out and can be discharged as a settled product 16. Depending on the size of the collecting container 14 and the receiving capacity of sedimented product 16, the emptying or the removal of the settled product 16 after each filling operation or at certain time intervals or

the like. Preference is given to a product return after each filling process, when it comes to a homogeneous particle size distribution in the bags.

The invention does not require a large-scale dedusting system, which has to process the entire air displaced from the open bag 3. Optionally, also a

Dedusting system can be used with significantly smaller capacity, for example, to dedust the gap on a telescopic filler neck. This will, however, usually less than half or even less than a quarter of

Dust removal capacity of conventional packing machines needed.

The product 16 deposited in the collecting container can be reused in a pure type and is refilled here during the next filling process. This means that even with a product change only relatively small cleaning work is necessary.

Reference sign list

1 packing machine 21 flow connection

2 product, bulk 21a width

3 open bag 22 dedusting device

3a volume 23 closure

4 control device 24 blowing device

5 product stock, silo 25 pipe

6 Dosing device 26 Environment

7 intermediate container 27 displacement volume

8 closure unit 28 filters

9 Part of the product quantity 29 Closing flap

10 to be filled amount 30 compression device

11 filling nozzles 31 floor vibrators

IIa width 32 vacuum lance

12 weighing device 33 flow channel

13 filling system 34 pipe

14 sump 35 airflow

15 calming volume 36 product flow

16 deposited product 37 sensor

17 Product conveyor 38 Sensor

18 central product feed 39 gap

18a width 40 frame

19 side air discharge 41 flexible hose

20 filling position

Claims

Claims :

1. Packing machine (1) for filling dusty products such as bulk materials (2) in open sacks (3) by means of a

Filling operation, with a control device (4) and a weighing device (12, 12 ^λ ) for weight-dependent control of the filling process, and with a product supply (5) and at least one metering member (6) and with a filler neck (11), on the in the filling process the product can be fed to a prepared open sack (3),

characterized,

in that the filling nozzle (11) is connected to a collecting container (14) via such a flow connection (21) that a pressure surge occurring during a filling process leads to the transfer of the displacement air contained in the opener bag (3) and dusting product (2) into the collecting container is being used,

around in the collecting container (14) the displacement air

and to settle and at least partially deposit a dust portion of the displacement air into the sump (14) as a deposited product (16).

2. Packing machine (1) according to the preceding claim, wherein the collecting container (14) with a downstream

Product conveyor (17) is connected to the in the

Collecting container (14) deposited product (16) by means of the downstream product conveyor (17).

3. Packing machine (1) according to the preceding claim, wherein the product conveyor (17) is provided to intermittently remove at least a portion of the deposited product (16).

4. packing machine (1) after one of the two preceding

Claims, wherein a provided with a controllable closure unit (8) intermediate container (7) is provided, which by means of the metering member (6) from the product supply (5)

Product (2) can be supplied, and wherein the product conveyor (17) with the intermediate container (7) is connected to the

deposited product (16) the intermediate container (7)

attributed.

5. packing machine (1) according to any one of the preceding claims, wherein the collecting container (14) is directly connected to the filler neck, so that the flow connection (21) at least in part by a transfer opening between the

Filler and the collecting container (14) is formed.

6. Packing machine (1) according to one of the preceding claims, wherein the flow connection (21) by a flow channel (33) is formed, wherein a ratio of a free diameter of the flow channel to a length of

Flow channel is greater than 1:10.

7. packing machine (1) according to any one of the preceding claims, wherein the flow connection (21) by a flow channel (33) is formed, wherein a ratio of a cross section of the flow channel to a free cross section of

Filler is greater than 1: 4.

8. Packing machine (1) according to one of the preceding claims, wherein a calming volume of the collecting container (14) is variable in size.

9. packing machine (1) according to any one of the preceding claims, wherein the collecting container (14) via an upright

extending pipe (25) with the environment (26) is connected.

10. Packing machine (1) according to one of the preceding claims, wherein the tube (25) is a variable size

Displacement volume (27).

11. Packing machine (1) according to one of the preceding claims, wherein the weighing device (12) is adapted to weigh a filling system (13), wherein the filling system (13)

at least the filler neck (11), so that an attached thereto Offensack (3) is weighed to a

Filling process in the gross procedure.

12. packing machine (1) according to the preceding claim, wherein the filling system (13) and the collecting container (14).

13. packing machine (1) after one of the two preceding

Claims, wherein the collecting container (14) from the filling system (13) is received decoupled.

14. packing machine (1) according to any one of the preceding claims, wherein the control device (4) is adapted and designed to the metering member (6) time and / or

volume controlled to operate to collect a significant portion of the product to be filled in a filling process (2) in the intermediate container (7) and by opening the

controllable closure unit (8) through the filler neck (11) into the open sack (3) to empty.

15. packing machine (1) according to any one of the preceding claims, wherein the weighing device (12) is adapted to weigh the intermediate container to a filling in the

Performing a net procedure.

16. Packing machine (1) according to one of the preceding claims, wherein at least one compression device (30) is provided.

17. Packing machine (1) according to one of the preceding claims, wherein the filler neck (11) has a central product supply (18) and at least one lateral air outlet (19).

18. A method for filling dusty products such as bulk materials (2) in open sacks (3) by means of a filling operation on a packaging machine (1), wherein the filling process is controlled by weight with a control device (4) and a weighing device (12, 12 ^λ ), wherein with at least one dosing member (6) from a product supply (5) product (2) is metered controlled and filled through a filler neck (11) in a prepared for the filling process open bag (3),

characterized,

that occurring during a filling operation pressure surge for the transfer of the in the open bag (3) contained and

dusty product (2) comprising displacement air via a flow connection (21) of the filler neck (11) is used with a collecting container (14) to the in the open bag (3) contained and the dusty product (2) containing

Displacement air in the with the filler neck (11) connected collecting container (14) to guide and calm, so that the dust content of the displacement air at least partially in the collecting container (14) as a deposited product (16) settles.

19. The method according to the preceding claim, wherein the

deposited product (16) is discharged intermittently.

20. The method according to one of the two preceding claims, wherein the filling process is carried out according to the gross or net method.

21. The method according to any one of the three preceding claims, wherein initially a part of the amount to be filled in a

Intermediate tank is filled.