EP2391502B1 - Device for producing bags from hose-shaped material - Google Patents

Description

The invention relates to a device for producing sacks of tubular material, which comprises woven plastic tape fabric, according to the preamble of claim 1, and a method for producing sacks according to the preamble of claim 11.

Such devices are known and have been available on the market for a long time. These devices typically include a tube forming apparatus for making and providing a tubular material. It may also be present only a Schlauchabwickelvorrichtung. This is usually equipped with a material wrap on which tubular material is wound. From this material wrap the material is usually withdrawn continuously in the longitudinal direction.

In the sack manufacturing process of the prior art machines, the fabric hose provided by the hose forming apparatus or by the hose unwinding apparatus is fed to the cross cutter, which separates the fabric hose into individual pieces of hose. The pieces of hose are transferred to a transport device. By means of this transport device, a change of the original transport direction, in which the tube or pieces of tubing were transported in the direction of their longitudinal axes, takes place in a new transport direction, so that the tube pieces are no longer transported in the direction of their tube longitudinal axis, but transversely thereto, so that the ends of the hose pieces for the purpose of Anformung the floors laterally accessible are. The original and the new transport direction of the hose or hose piece are perpendicular to each other.

As already mentioned, the tubular fabric material, which may also be coated, is singulated into pieces of tubing. In the manufacture of tubing, the tubing is progressively advanced in its longitudinal direction by one length of tubing. To enable the cyclic advancing, a compensation device in the form of at least one movable deflection bar is provided between the material winding and the separating device. Subsequently, a piece of hose is separated from the hose, so separated. This is usually done with a cutting tool such as a knife. However, other separation methods and the associated facilities are conceivable. Said material wrap often comprises a fabric tube made of a circular woven material. The tube produced on a round loom is flattened after its manufacture and provided with a coating, which ensures that parts of the hose piece can be welded together without the stretched fabric being damaged and losing its strength.

The hose forming apparatus forms tubular material by stacking the edges of the web of material and joining them together, for example by means of a plastic extrudate. In this process, both the flat web and the hose are transported in the longitudinal direction. The tubular material consists of two superimposed material webs, which may each consist of several layers. The said hose-forming device may additionally be capable of inserting gussets. Gusseted bags have advantages when stacked when filled. Producing tubing made of woven and coated sheet material has the great advantage that no coating material protrudes laterally beyond the edges of the flat tube, as is often the case when flat laid, tubular woven tubing is coated. Supernatant coating material leads often errors in the manufacture of bags from pieces of tubing.

The piece of hose produced in the manner described is taken over by at least one transport device in order to spend it in the individual processing stations. After separation, the pieces of hose are no longer transported in the longitudinal direction, but in the transverse direction. By "transverse direction" it is meant that the pieces of tubing are now transported transversely to their longitudinal extent so as to obtain unimpeded access to both ends of the pieces of tubing in the further steps of making bags.

• In einer fakultativ vorhandenen Vorbruchstation werden Formstempel zur Erzeugung einer Falzlinie auf das Schlauchstück abgesenkt. Auf dieser Falzlinie befinden sich später die Eckeinschläge des geöffneten Schlauchbödens. 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 Eckeinschläge 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 mit Hilfe 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. Dabei können Bereiche dieser Laschen überlappen, und diese überlappenden Bereiche dieser Laschen können miteinander verbunden werden.
• Anschließend wird in der Bodendeckblattstation ein Bodendeckblatt mit der zugefalteten Bodenöffnung befestigt, beispielsweise verschweißt.

In the following, individual stations are listed during bag making and their function is explained:

• In an optional pre-break station, dies are lowered onto the length of hose to create a fold line. On this fold line are later the corner impacts of the open Schlauchbödens. The dies can also be heated for this purpose.
• In the bottom opening station, at least one end of a piece of hose is pulled open, so that a bottom can be formed on this end being pulled up. The corner stops are located on the fold lines of the hose section. 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 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, the finished bag can later be filled with the aid of 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. It can areas of these tabs overlap, and these overlapping areas of these tabs can be interconnected.
• Subsequently, in the ground cover sheet station, a ground cover sheet is attached with the folded bottom opening, for example, welded.

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.

As already mentioned above, in the sack-making process, in known sack-making devices, the fabric hose provided by the hose-forming device is fed to the cross-cutting device, which separates the fabric hose into individual pieces of hose. The pieces of hose are transferred to a transport device. By means of this transport device, a change of the original transport direction, in which the tube or pieces of tubing were transported in the direction of their longitudinal axes, takes place in a new transport direction, so that the tube pieces are no longer transported in the direction of their tube longitudinal axis, but transversely thereto, so that the ends of the hose pieces are laterally accessible for the purpose of molding the floors. The original and the new transport direction of the hose or hose piece are perpendicular to each other. For this reason, the tube forming apparatus and the above-mentioned processing stations are also arranged perpendicular to each other.

A generic device is from the CH 425 434 A known, which comprises an unwinding, from which tubular material is unwound and singulated into pieces of tubing, wherein the tubular material is first transported in the tube extension direction. After separation, the pieces of hose are transported transversely to their longitudinal direction.

The vertical arrangement of the hose forming device to the processing stations is disadvantageous. The floor space of production halls is usually rectangular and therefore such an arrangement is space consuming.

The US 3,871,270 discloses a bag-making device in which the transport direction in the tube-forming device and in the bottom-forming device are arranged parallel to each other. After separation of the tube into pieces of tubing, these pieces of tubing are rotated 90 degrees within another conveyor so that they can be transversely transported within the bottom forming device. This further transport device is mechanically very complex and also also requires a large footprint.

The object of the present invention is therefore to propose a device for the production of bags of tubular material, which can be constructed to save space.

According to the invention this object is solved by the features of the characterizing part of claims 1 and 11.

Thus, the transporting directions of the tubular material in the hose forming device and the hose pieces in the transporting device are aligned parallel to each other. "Parallel" can be understood to mean that the transport directions are opposite or also rectified. The former case is interesting if an elongated, narrow workshop is available. The second case is suitable for rather wide, but short workshops. "Parallel" also means the horizontal component of the direction of movement. A vertical component of motion remains unaffected.

The hose forming device conveys the tubular material along the tube longitudinal axis. Since the processing stations have to reach the ends of the individual pieces of hose, it is advantageous to the hose pieces transversely to the longitudinal axis to the processing stations transport. Therefore, it is provided according to the invention that at least one deflecting device is provided between the hose forming device and the bottom forming device, with which the tubular material is deflected before the cross cutting in a new transport direction, which extends at least partially transverse to the original transport direction. Thus, the hose can be conveyed already in the direction corresponding to the position of the hose pieces, which is necessary for the subsequent processing of the hose pieces. In contrast, it would be possible to singulate the tube in the transport direction into pieces of tubing and to rotate these pieces of tubing individually or in a package, which is, however, complicated and thus expensive compared to the inventive solution. The deflected tube can then be separated into individual pieces of tubing, which are then fed to the processing stations in a direction of movement transverse to their longitudinal axis. A hose unwinding device may also be arranged according to the invention.

A particularly preferred embodiment of the invention includes that the deflection device, with which the tubular material is deflected, in its position variable, in particular in the original transport direction of the tubular material is displaceable. This has the advantage that the edge layer of different widths of material hoses can be adapted to the cross-cutting or separating device. Especially with hoses that are produced in a hose-forming device, the middle layer, regardless of the hose width, is usually the same. By the transport device, however, the hose pieces are detected on its front side edge, so that not the center line, but the leading edge, regardless of the hose width, must assume a constant position. This is achieved particularly easily by the displaceability of the deflection device. Nevertheless, it is conceivable that a plurality of deflection elements are provided, which are variable in their inclination angle relative to the transport direction of the tubular web. Also in this way, the position of the leading edge can be adjusted.

The deflecting device can advantageously be a per se known air turning bar. The air turning bar may include holes that are exposed to air, so that the tubular material can be guided without contact over the turning bar.

In a preferred embodiment of the invention, the separating device and the deflection device are vertically spaced from each other. Preferably, the deflection device is arranged above the separating device. However, the deflection device can also be positioned below the separating device. This makes it possible for the hose delivery device and the further hose piece processing stations to be constructed or arranged directly one behind the other - in a line. In this case, the geometric hose and hose center line are in line, which also avoids unnecessary space consumption. Above all, it is possible that the transport direction of the tube by means of only one, in the transport direction of the tube obliquely arranged deflecting device is changed. It is particularly advantageous if the deflecting device is arranged above the separating device. By means of transport rollers whose axes of rotation are arranged transversely to the transport direction of the tube, the latter can be passed to the level of the separating device.

In a further preferred embodiment of the invention, the hose-forming device comprises a storage device which is arranged in the transport direction of the hose in front of the deflection device. With the storage device, tubular material previously generated by the tube forming device is storable. Thus, for example, in the event of a malfunction of the hose-forming device or during a material-winding change, the individual processing stations (in particular the hose-separating device) can be further supplied with tubular material without the sack production having to be stopped. Also, within certain limits, further tubing can be stored when the processing stations need to be stopped.

In a further advantageous embodiment, the hose-forming device comprises a winding with which the previously prepared tubular material can be wound into a winding. The tube forming apparatus can operate "offline" - that is, without supplying tubular material to the processing stations.

In "offline mode", the processing stations can also be fed by a unwinding device with tubular material. The unwinding device comprises a coil of tubular material and is not connected to the hose forming device. The material wrap may have previously been produced by the tube forming device.

The device for producing sacks can therefore be operated in two alternative ways of working. In the so-called "in-line operation", the cross-cutting device is used directly with tubular material from the Hose forming device supplied. In the "off-line" mode, the sack making device is supplied, as described above, by a separate tubing reel that can be produced by the hose forming device in the manner described. In this way, the said components of the device for the production of sacks can be operated with the greatest possible flexibility. This flexibility is particularly required, for example, during maintenance work on individual components of the device for producing sacks.

In a further preferred embodiment, the hose delivery device comprises a device for detecting material defects. Due to the device for material defect detection faulty hose areas are recognizable. The faulty hose areas can be leaky seams. These may arise, for example, in the case of faulty bonding of the material web edges in the hose forming device. However, defective hose areas can also be fabric defects or coating defects of the flat material, which is made into a tubular material. Even a wrong hose width can be recognized as a defective hose area.

It is advantageous if, in the transport direction of the tubular material, a separation separator is provided behind the tube separating device. With this separating softener pieces of hose, which have faulty areas, can be discharged.

In a further advantageous embodiment of the invention, a control device is provided, which can be supplied via a suitable data line data from the device for material defect detection. This information is information about the defective areas of the tubular material described above.

The device for detecting material defects is advantageously arranged in front of the separating device. Behind the separating device is advantageously located directly the separation.

Advantageously, the Ausscheideweiche is activated by the control device, when the device for material defect detection detected a defective area (and this the control unit transmitted) and the respective tube section has been singled. Instead of the transport device now takes the elimination separator the hose section. In this case, the defective piece of hose is discharged before it can reach the individual processing stations and can be processed into a sack. With this timely discharge defective hose pieces can therefore be saved a lot of energy and time, because faulty hose pieces are not processed until the bag.

Fig. 1

Prinzipskizze einer Vorrichtung zur Herstellung von Gewebesäcken

Fig. 2

Draufsicht auf die Wendestange

Fig. 3

Schnitt III-III aus der Figur 1

Fig. 4

Seitenansicht der Schlauchbildungsvorrichtung

Further embodiments of the invention will become apparent from the description and the claims.
The individual figures show:

Fig. 1

Schematic diagram of an apparatus for the production of tissue sacks

Fig. 2

Top view of the turning bar

Fig. 3

Section III-III from the FIG. 1

Fig. 4

Side view of the tube forming device

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

The tube forming device 13 comprises a coil 3 containing sheet material 14. The web-shaped material 14 is fed in the transport direction x 'a hose forming portion 28. Here, the web-shaped material is folded back on itself in a known manner and the edges glued or welded together, so that a material tube 2 is formed. Subsequently, the tube 2 undergoes the so-called opening in the Opening station 5. The fabric hose 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 2, separate. Only with separate layers can it be ensured that the following production steps can be carried out properly. Subsequently, the separate material layers of the tube 2 are placed again on each other.

In the further course of transport, the tubular material web 2 is a deflection device, preferably at least one turning bar 17, supplied. The turning bar 17 is displaceable in the direction of the double arrow 15. By means of the turning bar 17, the material hose 2 is directed from the original transport direction x 'in the transport direction y and fed to a cross-cutting device 6, which separates the fabric tube into individual tube pieces 16.

Subsequently, the tube pieces 16 are transported transversely to their tube longitudinal axis in the transport direction x, so that the ends of the tube pieces for the purpose of Anformung the bottoms of the respective processing stations are laterally accessible.

The transport direction x 'of the tubular material 2 and the transport direction x of the tube piece 16 are parallel.

By the parallel course of the transport direction x 'of the tubular material and x of the hose piece is achieved that a parallel arrangement of the hose forming device to the processing stations is possible. As a result, a very compact and space-saving design of the sack manufacturing device is possible. It is also possible by the parallelism of the directions of movement x 'and x, set up the hose delivery device and the individual processing stations directly behind each other and thus to obtain a long but slim bag production line.

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 floors are now closed in the bottom closing station 10, wherein two tabs are placed on each other and permanently connected to each other, for example by welding. 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 a plan view of the turning bar 17. The turning bar can be rotatably mounted on a holder 24 on a support frame 18. The holding frame 18 is in the embodiment shown here in a plane which is parallel to the direction of movement of the tubular material 2. Below the holding frame 18 slides 20, 27 are mounted, which engage in rails 19 ( FIG. 3 ). The holding frame 18 is movable by means of the carriages 20, 27 on the rails 19. The carriage 27 is extended in the direction z. At the lower end of the extended carriage 27, a spindle nut is incorporated, in which a spindle 21 engages. The spindle 21 is rotatable by means of the motor 23. By rotation of the spindle 21, which engages in the spindle nut of the extended carriage 27, the holding frame - and thus also rotatably mounted on the turning bar 17 - in the direction x 'and -x' movable. Due to the mobility of the turning bar parallel to the direction of movement of the tubular material 2 (in the direction x 'and -x'), the edge position of different widths of material hoses can be adapted to the cross-cutting or separating device 6.
The spindle motor 23 is connected to a control device 25 via a suitable data line 26. In the control device, the width dimensions of the material hoses to be processed can already be stored. However, manual entry of these width dimensions is also possible. In a job change, the control device 25 controls the spindle motor 23 due to the width dimension of the tubular material such that the Turning bar 17 in the direction x 'is moved until the edge position of the tubular material is adapted to the cross-cutting or separating device 6.

The FIG. 4 shows the side view of a hose forming device 13. The web-shaped material 14 is unwound from a roll 3 and fed to a hose forming region 28 not described in detail, in which 28 the web-shaped material 14 is processed into tubular material 2. Subsequently, the tubular material passes through guide rollers 22 to the turning bar 17. Alternatively, even in the so-called off-line mode web material can be wound on a winding 4. As already mentioned, the material hose 2 is guided by means of the turning bar 17 from the original transport direction x 'in the transport direction y and fed to a cross-cutting device 6, which separates the fabric tube into individual tube pieces 16. You can use the FIG. 4 recognize that the turning bar is in a plane above the cross-cutting device. The separating or cross-cutting device 6 can also be supplied by a separate material winding 29 with tubular material. The bag making apparatus can be operated in two modes of operation. In the so-called "inline mode", the cross-cutting device 6 is supplied directly from the hose-forming device 13 - via the turning bar 17 - with web-shaped material. In the so-called "offline mode", the cross-cutting device is supplied by a separate winding 29 with tubular material. The tubular material may have previously been made by the tube forming device 13 and wound into a coil 4. In this case, the bag 4 would then be brought to the position of the roll 29 for bag production.

Below the guide rollers 22 is a passage 7 through which 7 the operator can pass through. Thus, both sides of the machine can be reached by the operators of the bag making device without having to circulate the entire machine. This is particularly advantageous because with the succession of the tube forming device 13 and the individual piece piece machining stations the overall machine length is enlarged. The position of the passage directly next to the separating or cross-cutting device 6 is advantageous because the operator can more easily access the cross-cutting device 6 and, for example, can eliminate material compression. In addition, from there both tubing wraps 4 and 29 can be reached by the operator. This is advantageous both in the case of errors occurring as well as in a Materialwickelwechsel. LIST OF REFERENCE NUMBERS 1 Bag-making apparatus 2 tubular material 3 reel 4 Wrap with tubular material 5 opening station 6 separating device 7 passage 8th Bottom opening station 9 valve station 10 Bottom closing station 11 Cover Station 12 bag stack 13 Tube-forming device 14 sheet material 15 double arrow 16 hose piece 17 turning bar 18 holding frame 19 rails 20 carriage 21 spindle 22 guide rollers 23 spindle motor 24 bracket 25 control device 26 data line 27 carriage 28 Tube formation area 29 Wrap with tubular material X ' transport direction X transport direction

Claims (11)

1. Apparatus (1) for producing bags from tubular material (2), which comprises woven fabric made of drawn plastics strips, the apparatus at least comprising:

   - at least one flexible-tube-forming apparatus (13), by means of which tubular material (2) for producing bags (12) can be produced from web-form material (14) and in which the tubular material (2) can be conveyed in a transporting direction (x') wherein the flexible-tube-forming apparatus (13) comprises a roll (3), which contains the web-form material (14), and

   - at least one flexible-tube-separating apparatus (6), by means of which (6) flexible-tube pieces (16) can be separated from the tubular material (2), and

   - a bottom-forming apparatus (8, 9, 10, 11), by means of which (8, 9, 10, 11) bottoms can be formed at at least one end of a flexible-tube piece (16),

   - at least one transporting device, by means of which the flexible-tube pieces (16) are transported within the bottom-forming apparatus (8, 9, 10, 11) in a transporting direction (x), which runs transversely to the direction (y) in which the flexible-tube pieces extend,
   characterized
   in that the transporting direction (x') of the web-form material and of the tubular material (2) in the flexible-tube-forming apparatus (13) and the transporting direction (x) of the flexible-tube pieces in the transporting device are parallel to one another, and in that at least one deflecting mechanism (17) is provided between the flexible-tube-forming apparatus (13) and the bottom-forming apparatus (8, 9, 10, 11), it being possible for the deflecting mechanism to deflect the tubular material (2) into a new transporting direction (y), which (y) extends, at least in part, transversely to the original transporting direction (x').
2. Apparatus according to the preceding claim,
   characterized in that
   the deflecting mechanism (17) can be displaced in the transporting direction (x', x) of the tubular material (2).
3. Apparatus according to either of the two preceding claims,
   characterized in that
   the deflecting mechanism (17) comprises at least one turning bar (17).
4. Apparatus according to one of the preceding claims,
   characterized in that
   the separating apparatus (6) and the deflecting mechanism (17) are spaced apart vertically.
5. Apparatus according to one of the preceding claims,
   characterized in that
   the separating apparatus (6) and the deflecting mechanism (17) are arranged one above the other.
6. Apparatus according to one of the preceding claims,
   characterized in that
   the flexible-tube-forming apparatus (13) comprises a storage mechanism, by means of which tubular material (2) can be stored and then fed to the flexible-tube-separating apparatus (6).
7. Apparatus according to one of the preceding claims,
   characterized in that
   the flexible-tube-forming apparatus (13) comprises a mechanism for detecting material defects, it being possible for said mechanism to detect defective flexible-tube regions.
8. Apparatus according to one of the preceding claims,
   characterized in that
   a separating-out diverter, by means of which flexible-tube pieces (16) can be ejected, is provided downstream of the flexible-tube-separating apparatus (6), as seen in the transporting direction (x', x) of the tubular material (2).
9. Apparatus according to one of the preceding claims,
   characterized in that
   a control mechanism is provided, it being possible for data from the mechanism for detecting material defects to be directed to said control mechanism via a data line.
10. Apparatus according to the preceding claim,
    characterized in that
    the separating-out diverter can be activated via the control mechanism, on account of the data from the mechanism for detecting material defects, such that the defective flexible-tube pieces can be separated out.
11. Method of producing bags from tubular material (2), which comprises woven fabric made of drawn plastics strips, wherein,

    - with the aid of at least one flexible-tube-forming apparatus (13), tubular material (2) for producing bags (12) is produced from web-form material, and the tubular material (2) is conveyed in a transporting direction (x') in said flexible-tube-forming apparatus, wherein the flexible-tube-forming apparatus (13) comprises a roll (3), which contains the web-form material (14), and,

    - with the aid of at least one flexible-tube-separating apparatus (6), flexible-tube pieces (16) are separated from the tubular material (2), and,

    - in a bottom-forming apparatus (8, 9, 10, 11), bottoms are formed at at least one end of a flexible-tube piece (16), wherein,

    - with the aid of at least one transporting device, the flexible-tube pieces (16) are transported within the bottom-forming apparatus (8, 9, 10, 11) in a transporting direction (x), which runs transversely to the direction (y) in which the flexible-tube pieces (16) extend,
    characterized
    in that the web-form material and the tubular material (2) in the flexible-tube-forming apparatus (13) and the flexible-tube pieces (16) in the transporting device are transported parallel to one another in a movement direction (x', x), and in that, by means of at least one deflecting mechanism (17) between the flexible-tube-forming apparatus (13) and the bottom-forming apparatus (8, 9, 10, 11), the tubular material (2) is deflected into a new transporting direction (y), which (y) extends, at least in part, transversely to the original transporting direction (x').

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