EP2276628B1 - Device and method for producing bags - Google Patents

Description

The invention relates to an apparatus and a method for the production of sacks, which comprise fabrics of stretched plastic tapes, according to the preambles of claims 1 and 9.

• ∘ In der Vorbruchstation werden Formstempel zur Erzeugung einer Falzlinie auf das Schlauchstück abgesenkt. Auf dieser Falzlinie befinden sich später die Eckeinschläge des geöffneten Schlauchbodens. Die Formstempel können zu diesem Zweck auch beheizt werden.
• ∘ In der Bodenöffnungsstation wird zumindest ein Ende eines. Schlauchstücks aufgezogen, so dass an diesem aufgezogenen Ende ein Boden angeformt werden kann. Die Eckeinschäge befinden sich auf den Falzlinien des Schlauchstücks. Aufgrund ihrer geometrischen Form wird die Bodenöffnung auch Bodenöffnungsquadrat genannt. Dabei sei angemerkt, dass die Form nicht quadratisch, sondern in den meisten Fällen rechteckig ist. In der Regel werden beide Enden eines Schlauchstücks auf die gleiche Weise bearbeitet.
• ∘ In der Ventilzettelstation wird ein Ventilzettel auf den zuvor geöffneten Boden des Schlauchstücks gelegt. Durch den Ventilzettel kann später der fertige Sack mithilfe eines geeigneten Füllstutzens befüllt werden.
• ∘ In einer so genannten Zulegestation, werden Teile der Bodenöffnungen bzw. der Bodenöffnungsquadrate, die so genannten Laschen, beidseitig zur Falzkante hin zurückgefaltet und die überlappenden Bereiche dieser Laschen miteinander verbunden,
• ∘ Anschließend wird in der Bodendeckblattstation, ein Bodendeckblatt mit der zugefalteten Bodenöffnung befestigt, beispielsweise verschweißt.

Such devices are known and have been available on the market for a long time. As a rule, these devices initially comprise a separating device in order to separate a supplied fabric hose, which may also be coated, into hose pieces. These consist of two superposed material webs. The pieces of hose are then taken over by at least one transport device in order to spend them in the individual processing stations. In the following individual stations are listed and their function explained.

• Form In the pre-breaking station, forming dies are lowered onto the piece of hose to create a fold line. On this fold line are later the corner impacts of the open tube bottom. The dies can also be heated for this purpose.
• ∘ In the bottom opening station is at least one end of a. Pulled hose piece, so that at this end raised a bottom can be formed. The Eckeinschäge are located on the fold lines of the hose piece. Due to its geometric shape, the bottom opening is also called floor opening square. It should be noted that the shape is not square, but in most Cases is rectangular. In general, both ends of a piece of hose are processed in the same way.
• ∘ In the valve dispensing station, a valve leaflet is placed on the previously opened bottom of the tube piece. Through the valve leaflet later the finished bag can be filled using a suitable filler neck.
• ∘ In a so-called Zulegestation, parts of the bottom openings or the bottom opening squares, the so-called tabs, folded back on both sides of the folded edge and the overlapping areas of these tabs connected to each other,
• ∘ Subsequently, in the ground cover sheet station, a ground cover sheet with the folded bottom opening attached, for example, welded.

The individual processing steps of the above-mentioned processing stations are usually performed at both ends of the tube piece. These stations are the same structure in the existing machines on the operator and drive side with respect to the processing stations.

It should be noted that not all of the enumerated stations must be present in a sack making apparatus. So can be dispensed with a pre-break station. Even ground cover sheets do not always have to be applied to make a sack. Nevertheless, further stations are conceivable.

In the following, a bag making process according to the prior art machines will be briefly explained. Since the state-of-the-art machines on the operating and drive side are constructed almost identically in order to be able to work simultaneously on both ends of the hose piece, the following description does not deal in detail with the various sides of the machine. A previously separated piece of tubing is guided along its longitudinal axis by means of a suitable means of transport (for example double belt conveyor) to a pre-breaking station. There, a forming die, perpendicular to the transport direction of the hose pieces, lowered onto the hose pieces. The corner folds of the opened bottom of the sack, which is in the one on it, are later located on the folded edge following bottom opening station is formed. Subsequently, a valve is placed on the open bottom on a bottom opening in the valve dispensing station. Through this valve, the bag is later filled with a suitable filling member. In the following Zulegestation the bottom opening of the bag is folded, so that subsequently in the ground cover sheet station by welding the bottom opening thereof with a bottom cover sheet of the bag is completed.

However, this opposite identical structure of the processing stations of the prior art has the disadvantage that the tools of the processing stations interfere with each other in small bag formats.

The EP 1 253 005 A2 shows a modular machine for the production of bags. Due to this modular design, alternating or successive processing steps are carried out at the two ends of pieces of hose.

The WO 2004/058492 discloses a gluing station in a floor sorters for crossfloor bags wherein the gluing rollers on the operator side are at least partially offset from the gluing rollers on the drive side. These devices are therefore no longer mirror images of the operator and drive side.

In the transfer of this doctrine to generic devices, however, the overall length increases considerably.

Another disadvantage of this opposing construction of the processing stations lies in the maintenance of the same. When facing processing stations, the accessibility of the same for maintenance purposes is made difficult by their often large space. Since there are many moving parts in the processing stations, under certain circumstances, a readjustment or readjustment of the same is necessary. Due to the opposite or mirror-image construction of the individual stations of the machine, the stations are difficult to access for the purpose of this adjustment and adjustment work.
Completely finished before the other end is processed by the stations on the opposite side.

In this case, it is distributive, at least a first transport device, with which the hose pieces are conveyed in the transport direction, on the operator side and a second transport device, not or only partially overlapping with the first transport device to provide on the drive side. The transport device is advantageously a double-belt conveyor comprising, for example, magnets. The reciprocal conveying of the hose pieces or bags on the opposite sides of the machine is necessary when the bottom center distance of the bottoms of the bag ends is very small, so that the similar processing stations can no longer process the bag at the same time. The floor center distance is defined by the distance of the folded edges, which arise at the bottom opening. In addition, the conveyor belts would overlap with these very small bag formats, if they were on both sides, over the entire Machine expansion in the x direction, would run. The first transport device conveys the piece of hose along the processing stations of the first side (operator side or drive side). Subsequently, the bag is taken over by the second transport device and guided along the processing stations of the second (other) machine side.

It is also advantageous that a transport device for transporting pieces of tubing "centrally" between the operator and drive side is provided.

Further embodiments of the invention will become apparent from the description and the claims.

Fig. 1

Prinzipskizze einer Vorrichtung zur Herstellung von Gewebesäcken

Fig. 2

Perspektivische Ansicht einer Bodenöffnungsstation in einer erfindungsgemäßen Vorrichtung.

Fig. 3

Ansicht III - III aus Fig. 2

Fig. 4

Ansicht IV - IV aus Fig. 3

Fig. 5

Ansicht V - V aus Fig. 2

Fig. 6

Eine erfindungsgemäße Ausführungsform einer Maschine zur Sackherstellung

Fig. 7

Eine weitere erfindungsgemäße Ausführungsform einer Maschine zur Sackherstellung

Fig. 8

Eine weitere erfindungsgemäße Ausführungsform einer Maschine zur Sackherstellung

The individual figures show:

Fig. 1

Schematic diagram of an apparatus for the production of tissue sacks

Fig. 2

Perspective view of a floor opening station in a device according to the invention.

Fig. 3

View III - III off Fig. 2

Fig. 4

View IV - IV off Fig. 3

Fig. 5

View V - V off Fig. 2

Fig. 6

An inventive embodiment of a sack making machine

Fig. 7

Another embodiment of a sack making machine according to the invention

Fig. 8

Another embodiment of a sack making machine according to the invention

The Fig. 1 schematically shows individual steps for processing a fabric tube to bags, as done in bag making device 1.

First, the fabric tube 2 is fed to the sack manufacturing device 1. This advantageously takes place by unwinding the fabric tube forming a lap 3 in a development device 4. Subsequently, the tube 2 undergoes the so-called opening in the opening station 5. The fabric tube is guided around an inner tool around which separates the two layers, so that the layers, if they were glued together in one of the manufacturing steps of the tube, separate , Only with separate layers can it be ensured that the following production steps can be carried out properly. Afterwards, the separate material layers of the hose are put back on top of each other.

The fabric tube is now fed to the cross-cutting device 6, which separates the fabric tube into individual pieces of hose.

Subsequently, a change of the original transport direction z, in which the hose or the hose pieces were transported in the direction of their longitudinal axes, in the new transport direction x, so that the hose pieces are now no longer transported in the direction of z tube longitudinal axis, but transversely thereto, so the ends of the pieces of tubing are laterally accessible for the purpose of forming the bottoms.

In the following station, the bottom opening station 8, both ends of each tube piece are opened and the so-called bottom squares are laid. In the following valve station 9, a valve is placed and secured on one of the two open ends. The open bottoms are now closed in the bottom closing station 10, wherein two tabs are placed on each other and each other permanently, for example by welding, are connected. The conclusion of the actual Sackherstellprozesses forms the application of a ground cover sheet on the floors in the cover sheet station 11. For this purpose, the cover sheets can also be welded. The finished bags are then placed on the bag stack 12 and transported away from there on unspecified manner.

The Fig. 2 shows details of an opening station 5 in a device according to the invention. The tube pieces 13 are by means of a transport device not shown in the direction x on the surface of a support 14, for example, on the surface of a table, lying flat, so horizontally transported. In order to open one end 15 of the hose piece according to the invention, this end is first brought from the horizontal position to a vertical position. To allow this folding, the hose piece must be counteracted. For this purpose, the hose piece 13 is threaded under a folding belt 16. This folding tape can be relative to the hose pieces in peace and thus relative to the support in motion. However, the hose pieces can also move relative to the folding belt 16. This is the case, for example, when the seam is at rest. The rebate belt may consist of a flexible, but highly prestressed material. Preferably, however, these consist of steel sheets, which are connected in a manner not shown with the support 14 or with the machine frame. Steel sheets have the advantage over other components of a smaller thickness with the same load capacity. If the hose piece 13 is threaded, it is then guided past a guide element 17, for example a baffle.

After the end 15 of the tube piece 13 has been brought into the vertical position, this comes to the actual bottom opening device 18, which is shown only schematically in this figure. In this bottom opening device 18, two suction bars are provided, which engage on both sides of the folded-up end and are guided in or against the direction z, so that the material layers are separated from each other. The interior of the end 15 of the tube piece 13 is now accessible. Spreading elements now engage in this interior, which push the material layers further apart until they are horizontal again. This situation is illustrated by the open bottom 19.

The opening of the second end 15 'of the tube piece 13 takes place in the same way, but offset from the opening of the first end 15. The first end is already opened in the bottom opening device 18, while the second end 15' is guided under the folding band 16 '. By means of the guide element 17 'and the bottom opening device 18', the open bottom 19 'is generated in the manner described above. An offset arrangement of the components is advantageous if bags are to be produced with very small bottom center distances A.

When leaving the bottom opening station 8, the piece of tubing with open bottoms 19, 19 'is present, wherein all components of the opened bottoms are located substantially in the plane of the support 14.

A particular aspect of the bottom opening station 8 is the fact that each bottom opening device 18, 18 'is supplied with torque by its own drive. This is illustrated by the motor 22 on the bottom opening device 18. The corresponding motor on the bottom opening device 18 'is not visible in the illustrated view. The motor of a bottom opening device 18, 18 'primarily supplies the suction bars with a drive torque, so that they can move the material layers away from one another. Also, the spreading elements are powered by this engine with torque.

The conclusion of the bottom opening devices 18, 18 'form the pressure rollers 23, 23', which serve the purpose of compressing the freshly opened soils and thus to fix in their position. The resulting in the context of the bottom opening creases are thereby struck and then form right folded edges, so that the tendency of the soil decreases, straighten up again. As a counter-pressure element to the pressure rollers 23, 23 'is either the support 14 or the counter-pressure rollers 24, 24'. The pressure rollers 23, 23 'are in the FIG. 2 arranged in the transport direction x seen at the same height. These rollers 23, 23 'can also be arranged offset from one another, so that the open floors can be pressed immediately after the opening process in the manner described.

The FIG. 3 shows the view III-III in FIG. 2 , In this FIG. 3 Details of the floor opening station 8 can be seen. For detecting the material layers of the end 15 of the tube piece 13, suction strips are provided, of which the suction strip 20 facing the viewer can be seen. On the side facing away from the viewer suction pad 20 sucker are arranged, the the viewer facing side of the end 15 of the hose piece 13 to capture.

Since with the device 1 according to the invention bags with different floor widths should be produced, it is possible that the folded ends 15 of the hose pieces 13 have different heights H. In order to achieve a proper opening of the ends by means of the suckers, they should engage as close as possible to the upper end of the end 15. For this purpose, the suction pads 20, 20 'on vertical guides 21, 21' releasably secured, so that the suction pads in the direction of the double arrow y along the folded ends 15 can be moved and adjusted according to their heights H. The guides can be made in various ways. These can be round or rectangular profiles that are solid or hollow.

The Fig. 4 shows the view IV - IV from the FIG. 3 , In addition to the front suction bar 20 and the front guide 21, the suction bar 20 'and the guide 21' can now be seen.

The FIG. 5 shows the view V - V of FIG. 2 , The pressure roller 23 is mounted in a lever arm 25 or in a Hebelarmpaar. The lever arm 25 itself is pivotally mounted in the machine frame or in attachments 26 of the machine frame. In one embodiment, the lever arm 25 about an axis 27 which is fixedly connected to attachments, pivotable and fixable on this axis. For this purpose, a suitable, but not shown clamping device may be provided. By means of the fixing of the lever arm 25 on the axis 27, the distance of the peripheral surface to the counter-pressure roller or to the support 14 can be fixed. In this way, the open bottom is only applied to a pressing force, if this is necessary to bring the components of the open soil in the horizontal plane.

In a further embodiment it can be provided that the lever arm is freely rotatably mounted on the axle 27. Alternatively, it may be provided be that lever arm 25 is fixedly connected to a shaft which is rotatably mounted in the attachments. In the mentioned embodiment, the pressure roller 23 can now act on the opened trays with a predetermined force, for example its own weight.

As an alternative to the pressure roller to press the open bottom, the support 14, which in the FIG. 2 shown serve. However, another possibility is to provide a counter-pressure roller 24, with which the pressure roller 23 forms a nip in which the open trays 19 are compressible. The counter-pressure roller can be rotatable, but arranged fixed to the frame.

The FIG. 6 shows an inventive embodiment of a sack making machine. The individual processing stations are shown here only schematically. The tube section 13 is guided transversely to its longitudinal axis, which runs in the z-direction, in the x-direction initially along a bottom opening station 8 on the operating side BS. The associated pressure roller 23 smoothes the newly formed blind opening. While the tube piece is still being transported in the x-direction, a bottom opening 19 'is formed at its second end 15' by a bottom opening station 8 'on the drive side AS. This 8 'is arranged in the x-direction offset to the bottom opening station 8 of the operator side. The associated pressure roller 23 'also smoothes the currently open bottom 19'. By this staggered arrangement of the bottom opening stations 8, 8 'on the operator and drive side, for example space problems regarding. The space to be avoided at these processing stations.

Subsequently, the piece of hose is guided to a valve dispensing station 9, which applies a valve to the bottom opening 19, through which later, with the aid of a suitable filling member, the filling material can be introduced into the bag.

Deviating from the FIG. 6 can also be the valve dispensing station 9, which is arranged only on one side, preferably the operating side, opposite one of the bottom opening stations 8, 8 'may be arranged. In the preferred Embodiment is the valve pad station 9 so opposite or at least partially overlapping the bottom opening station 8 '. In this configuration it is possible to produce bags with very small center spacings. In addition, the device comes out with the smallest possible length.

In the Zulegestationen 10, 10 ', the bottom openings 19, 19' then folded before in the bottom cover sheet station 11, 11 'the cover sheets with selbigen 19, 19' welded or glued with a suitable adhesive (extrudate, cold glue, etc.). The two Zulegestation 10, 10 'are arranged opposite each other in the present embodiment. The same applies to the two bottom cover sheet stations 11, 11 '.

The FIG. 7 shows a further embodiment of the invention a sack manufacturing machine 1. The tube pieces 13 are first transversely to its longitudinal axis in the x-direction, using a first transport device 30, one after the other to the processing stations 8, 9, 10, 11, which 30 on the operator side BS of Machine 1 is located. In this case, a closed bag bottom is formed with valve on the hose piece 13 - at its end 15. Thereafter, the semi-finished bag is transferred to a second transport device 31, which is located on the drive side AS of the machine 1. By means of the processing stations 8 ', 10', 11 ', the other end 15' of the tube piece 13 or the half-finished bag is formed into a finished bag bottom. This embodiment enables the production of very small bag formats. In these small formats, the conveyor belts of the transport devices 30 and 31 would overlap if they were to run on both sides over the entire machine extension in the x direction.

A machine according to the embodiment in FIG. 7 is flexible for even the smallest bag formats. Due to the staggered construction of the processing stations, it is possible to move the operating and drive side of the machine towards each other, so that very small bag sizes can be made.

The FIG. 8 shows a further embodiment according to the invention of a device 1 for the production of sacks. The similar processing stations 8, 8 ', 10, 10', 11,11 'are arranged alternately offset on the operator and drive side. This zipper-shaped arrangement of the processing stations 8, 8 ', 10, 10', 11,11 'is only interrupted by the valve station 9, which is arranged between the bottom opening and feed station 10 on the operator side BS. In this machine arrangement, all processing steps for bag production on the tube piece 13 are performed alternately first on the operator side BS and then on the drive side AS. By this arrangement, all processing stations are easily accessible for maintenance purposes. LIST OF REFERENCE NUMBERS 1 Bag-making apparatus 2 Gewebeschlauch 3 reel 4 handling facility 5 Location separating station 6 Transverse cutting device 7 Device for changing the transport direction 8 8 ' Bottom opening station 9 valve station 10, 10 ' Floor closing station, Zulegestation 11, 11 ' Cover Station 12 bag stack 13 hose Connector 14 edition 15, 15 ' End of the hose section 16, 16 ' binding on 17, 17 ' vane 18, 18 ' Bottom opening device 19, 19 ' open ground 20, 20 ' sucker bar 21, 21 ' vertical guidance 22 engine 23, 23 ' pressure roller 24 Backing roll 25 lever arm 26 attachment 27 axis 28 29 30 first transport device 31 second transport device A Bottom center distance H Height of the end 15 X Transport direction of the tube pieces 13 y Direction orthogonal to the plane which is spanned by the transport direction x and the extension direction z z Extension direction of the tube pieces 13 AS driving side BS operating side

Claims (9)

1. Apparatus (1) for producing sacks from tubular pieces (2), which tubular pieces (2) comprise woven fabrics made from drawn small plastic strips and consist of two material webs which lie above one another, at least the following devices being provided:

   • a transport apparatus, by way of which the tubular pieces (2) can be conveyed in a horizontal position in a transport direction (x) which runs transversely with respect to their direction of extent (z),

   • a bottom opening station (3), by way of which bottom opening station (3) open bottom squares (5) can be produced at at least one end (5) of a tubular piece (2),

   • a closing-up station (7), by way of which closing-up station (7) the bottoms (4) which were opened at the bottom opening station (3) can be folded closed,

   • a bottom covering sheet station (8), by way of which bottom covering sheet station (8) a bottom covering sheet can be applied in order to close the sack bottom,

   characterized

   • in that the bottom opening station (3) on the operating side (BS), by way of which the open bottom square can be produced at one end of the tubular piece (2), is arranged at least partially offset with respect to the bottom opening station (3') on the drive side (AS), by way of which the open bottom square can be produced at the second end of the tubular piece (2), the bottom opening station (3) on the operating side (BS) being arranged upstream of the bottom opening station (3') in the transport direction (x), and

   in that a valve panel station (9) which is arranged only on one side is provided, the said valve panel station being arranged on the operating side.
2. Apparatus (1) according to one of the preceding claims, characterized in that merely the bottom opening stations (8, 8') on the operating side (BS) and drive side (AS) are arranged at least partially offset with respect to one another.
3. Apparatus (1) according to either of the preceding claims, characterized in that the valve panel station (9) on the operating side (BS) is arranged so as to lie opposite the bottom opening station (8') on the drive side (AS).
4. Apparatus (1) according to one of the preceding claims, characterized in that the processing stations (3, 6, 7, 8) on the operating side (BS) and the identical processing stations (3', 6', 7', 8') of the drive side (AS) are arranged completely offset with respect to one another (in a zip-shaped manner).
5. Apparatus (1) according to one of the preceding claims, characterized in that first of all the processing stations (3, 6, 7, 8) are arranged so as to follow one another on the operating side (BS), and the identical processing stations (3', 6', 7', 8') are arranged completely offset on the drive side (AS).
6. Apparatus (1) according to one of the preceding claims, characterized in that first of all the processing stations (3', 6', 7', 8') are arranged so as to follow one another on the drive side (AS), and the identical processing stations (3, 6, 7, 8) are arranged completely offset on the operating side (BS).
7. Apparatus according to one of the preceding claims, characterized in that at least one first transport apparatus, by way of which the tubular pieces (2) can be conveyed in the transport direction (x), is provided on the operating side (BS) and a second transport apparatus is provided on the drive side (AS) so as to overlap only partially with the first transport apparatus.
8. Apparatus according to one of the preceding claims, characterized in that at least one first transport apparatus, by way of which the tubular pieces (2) can be conveyed in the transport direction (x), is provided on the operating side (BS), and a second transport apparatus is provided on the drive side (AS) so as to not overlap with the first transport apparatus.
9. Method for producing sacks from tubular pieces (2), which tubular pieces (2) comprise woven fabrics made from drawn small plastic strips and consist of two material webs which lie above one another, the following devices being provided:

   • at least one transport apparatus, by way of which the tubular pieces (2) are conveyed in a horizontal position in a transport direction (x) which runs transversely with respect to their direction of extent (z),

   • at least one bottom opening station (3), by way of which bottom opening station (3) open bottom squares (5) are produced at at least one end (5) of a tubular piece (2),

   • at least one valve panel station (6), by way of which valve panel station (6) a valve panel is applied to the bottom square,

   • at least one closing-up station (7), by way of which closing-up station (7) the bottoms (4) which were opened at the bottom opening station (3) are folded closed,

   • at least one bottom covering sheet station (8), by way of which bottom covering sheet station (8) a bottom covering sheet is applied in order to close the sack bottom,

   characterized

   • in that the bottom opening station (3) on the operating side (BS), by way of which the open bottom square (19) is produced at one end of the tubular piece (2), is arranged at least partially offset with respect to an identical processing station (3', 6', 7', 8') on the drive side (AS), by way of which the open bottom square (19') is produced at the second end of the tubular piece (2), the open bottom square (19) first of all being formed by way of the bottom opening station (3) on the operating side (BS), and the open bottom square (19') subsequently being produced at the second end of the tubular piece by way of the bottom opening station (3') on the drive side, and

   • in that by way of which a valve is applied to the open bottom square (19) by way of a valve panel station (9) which is arranged only on the operating side.

Images