ES2424952T3 - Procedure and device for the configuration of open bottoms in final areas of tubular bag bodies - Google Patents

Abstract

Procedure for the configuration of an open bottom in an open end zone of a tubular bag body (10), bag body that is preferably made of a fabric of stretched plastic bands or a plastic sheet, in which the body of bag is transported lying flat in a transport direction (T) transversely to longitudinal extension (L) with a transport speed (V), and during transport the end zone (10e) is opened to fold the tubular bag body, which it comprises the introduction of a separation tool (21, 30, 32) in the open end zone of the tubular bag body, the movement of the separation tool in the transport direction (T) with an increased speed (V1R) relatively relative to the transport speed (T), until the separation tool (21) stops against the inner side of the tubular bag body in the front part (10v) - seen in the transport direction - of the open end zone with at least s two contour points (23p, 24p; 33p, 34p) front defined in the separation tool, and thus separates the mentioned front part (10v) to give a front corner flap (10j) in the form of an essentially isosceles triangle, on the said side (10k, 10m) of the front triangular corner flap (10j) is in contact with at least one contour point (23p, 24p; 33p, 34p) front of the separation tool (21), the movement of the separation tool (21) out of the flap front corner (10j) due to relative slowing of movement with respect to the transport speed (V), and the tightening of the front corner flap (10j) generated, characterized in that the separation tool (21, 32) is configured as useful separated, being mounted on one arm (22) two plates (23, 24) or bars (33, 34) that leave a space (21a, 32a) free from each other, so that the clamping device (28, 35, 36 ) penetration can pass through the space (21a, 32a) in the separation tool without colliding with it, and p Orches the separation tool (21, 32) butt against the inner side of the tubular bag body in a translational movement in the transport direction (T).

Description

Procedure and device for the configuration of open bottoms in final zones of tubular bag bodies.

The invention relates to a method and a device for the configuration of open bottoms in open end zones of tubular bag bodies, bag bodies that are preferably made of a fabric of stretched plastic bands, according to the preambles of claims 1 and 10.

Such procedures and devices are known from DE 12 32 812 B and US 3,803,989.

Square bags, also called cross-bottom bags, are square-shaped bags that are manufactured in bag making facilities, providing tubular bag bodies whose open end areas fold to give crossed bottoms. The sack bodies are conducted lying flat through the installation of 10 confection, so that the two layers of the tubular sack body are in contact with each other. For the formation of the bottom, the two layers are separated from each other in the final areas of the tubular bag body, and one of the two layers folds back on itself in 180 ° as a side flap, whereby an open bottom is originated in the that the other layer forms a second side flap. In the front and back of this final zone, a triangular flap is created respectively by folding a layer in the final area of the tubular bag body. This process is also called "specialized" in specialized language. In another forming sequence, sheets with valve can be placed (for the manufacture of "square bags with valves", which can be filled through the valve with filling tubing), and the final bottom configuration is manufactured by overlapping bending from one to another of the bottom side flaps. The overlapping side side flaps are thermally bonded or welded together according to the material of the bag body. Alternatively or in addition, background cover sheets can be applied on

20 overlapping side flaps and can be glued or welded with them.

A similar bag making installation is described in patent AT 408 427 B.

However, the necessary intermittent operation has been shown as disadvantageous in this known bag making installation, which is very demanding with the drives and limits the production of bag bodies to be treated. The need for time for intermittent raising of funds, including the necessary fixation of

25 raised funds, may even represent an upper limit for the performance of the entire device for the manufacture of bags.

Therefore, attempts have also been made to set up open funds during the continuous transport of the tubular bag bodies, through a bag making facility. A similar bag manufacturing facility is described in DE 10 2008 017 442 A1.

30 The quality of a square bag depends essentially on the geometrically exact configuration of the bottoms. It is said that triangular corner flaps should approximate as closely as possible to the shape of an isosceles triangle, since only then is it possible to configure bottom side flaps, whose side edges are located in the open bottom stadium in parallel to a central baseline and therefore also parallel to each other. Only if the bottom side flaps have these side edges that run parallel to the center line of

At the bottom, it is again possible to fold them superimposed on each other parallel to the center bottom line. And only if the folding of the bottom side flaps is also made geometrically accurate, the finished bag bottom has the shape of a rectangle that makes the bag suitable for subsequent processing and stacking. Deformed bottoms in manufacturing also frequently exhibit a lack of tightness and strength.

The fundamental problem in the configuration of funds in the final zones of the tubular sack bodies consists of

40 that, in most bag making facilities, the layers of the final areas of the bag bodies have an geometrically indefinite shape after opening and it is very difficult to elaborate exactly geometrically defined backgrounds, thus starting geometrically indefinitely . A solution proposal for this problem is described in patents AT 407 236 B and AT 406 755 B. In this solution, the layers located one above the other are separated from the tubular bag body by means of suction devices. Then you enter a

45 sliding between the layers of the bag body which, in cooperation with a ruler, folds back a side bottom flap and at the same time fixes the other side bottom flap in front of a displacement. Through the use of the slide, geometrically accurate bottom side flaps are formed. In this known device the corner flaps are formed by the folding of a bottom side flap, however, due to the geometrically indeterminate starting position they do not always have the exact desired shape, so that the

50 subsequent treatment of the sack bottom by placing the valve sheets, bending the bottom side flap and connecting with a bottom cover sheet.

Therefore, there is as always the need for a procedure and a device for the configuration of geometrically accurate open bottoms in the open end zones of tubular bag bodies, in order to be able to subsequently treat these bag bodies in subsequent forming stations to give Square bags or square bags with high quality valve. The formation of the bottom should be carried out while the bag bodies are transported continuously, since with a continuous transport of the bag bodies a higher yield can be achieved with respect to the intermittent operation in the manufacture of bags. Therefore, an objective of the invention is also to manage to dominate the essentially greater danger of the configuration of deformed bottoms in installations of

5 making of bags that work continuously, due to the processes that run simultaneously in several directions.

The present invention solves this objective by providing a method for the configuration of open bottoms in open edge areas of tubular bag bodies, the bag bodies being transported flat in a transport direction transversely to their longitudinal extension with a transport speed. , and during the

In transport, the final zones to be folded of the tubular bag bodies are opened, according to the characteristics of claim 1.

The present invention also solves this objective by providing a device for the configuration of open bottoms in open end zones of tubular bag bodies, the bag bodies being transported flat in a transport direction transversely to their longitudinal extension with a transport speed. , and during the

The final zones to be folded out of the tubular bag bodies are opened, according to the features of claim 10.

The process according to the invention and the device according to the invention are especially suitable for the treatment of sack bodies of a fabric of stretched plastic bands. The plastic bands may be made of polyethylene or polypropylene and may eventually be provided with a plastic coating. Also, the fabric of 20 stretched plastic bands can be provided with a plastic coating in order to obtain the tightness of the fabric, improve the printing capacity and adjust other desired properties. The woven sacks of stretched plastic bands have surprising resistance to sacks of paper or plastic sheets, however, in the manufacturing process they tend to move and are also more difficult to fold than, for example, paper. It is therefore especially advantageous that these bag bodies can also be manipulated by the present invention.

But according to the invention, the bag bodies can also be treated from a plastic sheet or other materials or composite materials.

In general, the funds are configured in both end zones of the tubular bag bodies.

Other embodiments, advantages and features of the invention are apparent from the dependent claims and the following description of embodiments.

In the process according to the invention for the configuration of an open bottom in an open end zone of a tubular bag body, bag body which is preferably made of a fabric of stretched plastic bands or a plastic sheet, the body of bag is transported lying flat in a transport direction transversely to its longitudinal extension with a transport speed, and during transport the final area to be folded from the tubular bag body is opened. A separation tool is introduced into the open end zone of the tubular bag body. The separation tool is

35 moves in the transport direction with a relatively increased speed relative to the transport speed, until the separation tool abuts against the inner side of the tubular bag body at the front - seen in the transport direction - of the open end zone with at least two frontal contour points defined in the separation tool, and thus separates the mentioned front part to give a front corner flap in the form of an essentially isosceles triangle, each side of the corner flap being in contact triangular frontal with at least one point

40 front contour of the separation tool. Then the separation tool moves out of the front flap by a relative slowdown in its movement with respect to the transport speed and the generated front corner flap is pressed. The separation tool is configured as a separate tool, two plates or bars being mounted on one arm that leave a space between them free, so that the clamping device penetrates or passes through the space in the separation tool without colliding with it. . The separation tool abuts against the inner side of the tubular bag body in a

45 translation movement in the transport direction.

A device according to the invention, for the configuration of an open bottom in an open end zone of a tubular bag body, comprises a transport device for transporting the bag bodies in a flat lay state in a transverse transport direction to its longitudinal extension with a transport speed, and an opening device for opening the final zones to be folded from the tubular bag bodies during transport in the transport device. The device further comprises a separation tool that can be introduced into the open end areas of each tubular bag body during transport in the transport device, the separation tool being able to move in the transport direction with a relatively increased speed relative to the transport speed, until it reaches the front part - seen in the transport direction - of the open end zone and stops against the inner side of the tubular bag body with at least two frontal contour points defined in the tool 55 separation, and thus separates the mentioned front part to give a front corner flap in the form of an essentially isosceles triangle, each side of the front triangular corner flap being in contact with at least one point

front contour of the separation tool, and the separation tool moving out of the corner flap by a relative slowdown in its movement with respect to the transport speed. The device further comprises a clamping device for tightening the generated front corner flap. The separation tool is configured as a separate tool, two plates or bars being mounted on one arm that leave a space between them, so that the

5 clamping device penetrates or passes through the space in the separation tool without colliding with it. The separating tool stops against the inner side of the tubular bag body in a translational movement in the transport direction.

With this invention it is possible to configure an open bottom in a final area of a tubular bag body that has, from the tip of the front triangular corner flap, a well defined geometric shape, manifesting this

10 geometric shape, well defined as a whole, in an exact open bottom that allows the generation of bags of the highest quality and shape stability again.

Another improvement of the exact definition of the desired geometric shape of the open bottom can be obtained according to the invention if the separating tool moves in the open end zone of the bag body in the transport direction with a reduced or negative speed relative to the transport speed, until it reaches the rear - 15 seen in the direction of transport - of the open end zone, and stops against the inner side of the tubular bag body with at least two rear contour points defined in the tool of separation, and thus separates the aforementioned rear part to give a rear corner flap in the form of an essentially isosceles triangle, each side of the rear triangular corner flap being in contact with at least one rear contour point of the separation tool. After the formation of the rear corner flap, the separation tool moves out of the flap

20 rear corner by relative acceleration of its movement with respect to the transport speed, and the rear corner flap generated by a clamping device is tightened.

From the tube layers in the open end zone, side bottom flaps are advantageously formed which extend on opposite sides of a center bottom line, whereby the formation of the open bottom and the body of the body are geometrically determined. sack in this configuration can be transferred to others

25 treatment stations.

If, before the opening of the final zone of the tubular bag body, this final zone is carried along a fold line, which runs in the direction of transport from the first plane of the bag body lying flat, to a second plane that runs essentially orthogonal to it, the next opening of the end zone can be made especially simple. In particular in this embodiment, a bottom side flap of the open end zone is

30 can be formed by folding a first layer of the tube onto itself along a fold line that runs in the direction of transport, and the other bottom side flap can be formed from a second layer of the tube, while This second layer of the tube is folded in the plane of the bag body lying flat. Consequently, the open bottom is again in the plane of the bag body, which considerably facilitates tightening and transport to other treatment stations.

35 It is also advantageous that the separation tool is driven out of the final area of the bag body after the formation of the front triangular corner flap, and optionally also of the rear triangular corner flap, so that the bag body is can transport later without hindrance. In this case, it is especially preferred if the separating tool is driven out of the front corner flap of the bag body after fixing the tip of the corner flap by a clamping device. This prevents the corner flap from being securely prevented.

The front 40 begins to unfold after or even while the separation tool moves out of the front corner flap. This feature is especially useful, in particular for sack bodies of a material that tends to move and unfold, such as a plastic sheet or a fabric of stretched plastic bands.

In principle with the present invention it is possible to configure exact front and rear corner flaps, also if the separation tool is in contact with each side of the butt flaps with only one contour point. However, the

The process according to the invention will be developed more stably during hard production operation if the separation tool is provided with front contour lines and, for the formation of the rear corner flap, optionally also rear contour lines. These contour lines define sections of the sides of the front triangular corner flap and optionally also sections of the sides of the rear triangular corner flap, the contour lines can also be extended over the entire length of the sides.

50 It has been found that it is especially appropriate for the continuous transport of the bag bodies during its conformation that the opening of the final area of the tubular bag body is made by extending the layers of the tube in contact with each other of the bag body.

In a preferred embodiment of the invention, the opening device comprises connectable and disconnectable devices, which can be supplied respectively to a layer of the tube in the final area of the tubular bag bodies 55 and, after contact with the layer of the corresponding tube and activation of the suction effect, can be

move away from each other transversely to the transport direction and at the same time they can move with the transport speed in the transport direction. A similar opening device works in a very safe and maintenance-free manner. It has proven favorable for very safe opening processes that the central axes of the suction devices are arranged congruently or bead one after the other, preferably

5 offset, in the direction of transport T.

According to the invention, the separation tool has an arm and plates and / or bars mounted on this arm, in which the contour points or front contour lines are defined and optionally also the contour points or rear contour lines. In this case, the plates and / or bars can be adapted, in particular, to particular proportions or bag materials. It is further preferred that the plates and / or bars are arranged in a manner

10 symmetrical with respect to the transport direction, since in this way it is automatically obliged that also the formed corner flaps are oriented symmetrically with respect to the transport direction.

While the separation tool is mounted on a rotary drive, for example a toothed belt drive or chain drive oriented in the transport direction, the rotating drive can be accelerated or slowed relatively with respect to the transport speed, a very safe drive without

15 maintenance that can be synchronized exactly with the main drive, which is responsible for transporting the bag bodies.

While the separation tool is configured as a separate tool, so that the clamping device penetrates the separation tool or can pass through it without colliding with it, the tightening of the corner flap can now begin while the separation tool It is still in the corner flap. Thus the fixed clamping device

20 the corner flap facing deployment or deformation. The clamping device conveniently comprises clamping straps, clamping rollers and / or sliding clamping elements.

The invention with its features and advantages is now explained in detail by way of exemplary embodiments with reference to the drawings. In the drawings they show:

Fig. 1 to fig. 6 schematic perspective views of parts of a device according to the invention for the explanation of the method according to the invention;

Fig. 7A and fig. 7B a first embodiment of a separation tool in perspective and in plan view;

Fig. 8A and fig. 8B a second embodiment, which is located outside the invention, of a separation tool in perspective and in plan view;

Fig. 9A and fig. 9B a third embodiment of a separation tool in perspective and in plan view;

Fig. 10 a partial perspective view of a first embodiment of a clamping device;

Fig. 11 a perspective view of a second embodiment of a clamping device; Y

Fig. 12 a perspective view of a third embodiment of a clamping device.

The method according to the invention for the configuration of an open bottom in an open end zone of a tubular bag body is now explained by the steps of the procedure represented in fig. 1st fig. 6. The procedure

35 runs in a device 1 according to the invention for the configuration of an open bottom in an open end zone of a tubular bag body, which is then referred to as bottom opening device 1. Of this bottom opening device 1 only the essential characteristics for the invention are shown in fig. 1st fig. 6, in order to improve clarity. The parts of the bottom opening device 1, which have nothing to do with the invention or are familiar to the specialist, have been removed from the drawings.

40 The bottom opening device 1 has a transport device 2 in the form of a conveyor belt and moves continuously with a transport speed V in a transport direction T. Sack bodies are placed in the transport device 2 10 tubular in a flat lying state with its longitudinal extension transversely to the transport direction T. The bag bodies 10 are secured against sliding on the conveyor belt by means of fasteners not shown. Such fastening means comprise, for example,

45 slats of ferromagnetic material that are placed on the bag bodies 10 and are drawn against the conveyor belt from the bottom side of the conveyor belt with magnets that move along with the conveyor belt, and thus tighten the bag body located between them Against the conveyor belt. Alternatively, the conveyor belt is configured as a perforated conveyor belt, a vacuum is applied from the lower side of the conveyor belt that sucks the bag body 10 against the conveyor belt.

50 Tubular bag bodies 10 are made, for example, of a fabric of stretched plastic bands. The plastic bands may comprise a polyethylene or polypropylene material. Optionally the fabric has a plastic coating. The tubular bag bodies 10 may alternatively be made of a plastic sheet.

The bag body 10 has two opposite open end zones 10e, 10f. The final zone 10e must be shaped to give a cross bottom as explained below. In the subsequent processing, the final zone 5f can also be formed in the same manner as the final zone 10e to give a cross bottom, whereby a square bag or square bag with valve is generated.

In fig. 1 it can be seen that the tubular bag body 10 first lies flat in a first plane ε1 on the transport device 2. In this flat lay state, a first and a second layer of the tube 10a are in contact with each other , 10b. Then the final area 10e of the tubular bag body 10 is carried by a slat of

10 fold 12, which is designated in the specialized jargon as "pre-fold strip", and deflector plates 11a, 11b from the first plane ε1 of the sack body lying flat to a second plane ε2 which runs essentially orthogonally to it.

Fig. 2 shows the bag body 10 with end zone 10e fully folded orthogonally upwards (in the second plane ε2). The folding strip 12 continues in the transport direction T and now, in cooperation with the deflector plate 15, has the objective of holding the final area 10e of the bag body 10 folded in the second plane ε2 in this angular position with respect to the foreground ε1, in which the bag body 10 is located. An opening device generally designated with reference 20 comprises two suction devices 13, 14 that move from side to side transversely to the transport direction T on two crossbars 15, 16 represented symbolically. The crossbars 15, 16 may be configured, for example, as rails or pivot arms. Alternatively to this 20 the crossbars 15, 16 are cylinder and piston arrangements, the suction devices 13, 14 resting on the free ends of the pistons and being able to move from one side to the other transversely to the transport direction T. The crossbars 15 , 16 can be moved by stringers 17, 18 in the transport direction T with the transport speed V. Also the stringers 17, 18 can be configured, for example, as rails, pivot arms or cylinder and piston arrangements. The exact realization of crossbars and stringers does not play any role, it is only

It is essential that the suction devices 13, 14 are movable both transversely to the transport direction T and also in the transport direction T.

In fig. 2 is a process step, in which the two suction devices 13, 14 are brought into contact on opposite sides in the final area 10e with the first layer of the tube 10a or the second layer of the tube 10b. A vacuum is established so that the first aspiration device 13 aspirates the first layer of the tube 10a and the second aspiration device aspirates the second layer of the tube 10b. Care should be taken that the suction devices 13, 14 move synchronously with the transport device 2, with the transport speed V in the transport direction T, so that deformations of the layer of the tube 10a, 10b. Then they start moving away from each other the two suction devices 13, 14 transversely to the transport direction T (arrows P1 or P2), in this case they respectively drag with them a layer of the tube 10a, 10b and open

35 this way the final zone 10e of the tubular bag body 10.

Fig. 3 shows the final area 10e of the tubular bag body 10 in the open state, in which a free space 10g is formed between the layers of the tube 10a, 10b. In this representation it is also recognized that in the meantime the vacuum of the aspiration devices 13, 14 has been disconnected and the two aspiration devices 13, 14 have been separated from the gear with the tube layer 10a, 10b, and therefore can be moved upstream against the direction of transport T to open the final area of the next bag body. In this representation it is also seen that the open end zone 10e has a geometrically largely undefined shape. A separation tool 21 is now inserted into the inner space 10g of the open end zone 10e, the separation tool 21 moving in a circular arc (arrow P3) to the open end zone 10e. In this case, the curved movement of the separation tool 21 has a movement component oriented in the transport direction T with a higher relative speed V1R with respect to the speed

45 of transport V. The separating tool 21 is driven by one or several toothed belts that rotate in parallel, or one or several roller chains that rotate in parallel, the toothed belt 25 or the chain respectively oriented in the direction of transport T of at least 2 gear pulleys or chain wheels 26, 27. The bottom opening device is therefore configured of one or more separation tools, preferably two, the distance between the separation tools can be variable by means of units of separate drive.

50 Respectively one of the transmission pulleys 26, 27 is connected with a controllable drive, so that the separation tool can be accelerated and slowed down with respect to the transport speed V in a synchronized manner with the cadence with which the bodies of sack 10 through the bottom opening device 1.

For fig. 4 it can be seen that the circular arc movement of the separation tool 21, after it has circulated around the transmission pulley 26, becomes a translational movement in the transport direction T, so that it is dragged along the lower branch of the toothed belt 25. Due to the higher relative relative speed V1R existing as before with respect to the transport speed T, the separating tool 21 moves faster than the bag body 10 and therefore makes stop against the inner side of the tubular bag body in a front part 10v of the open end zone 10e, the contour points 23p, 24p of the separating tool 21 coming into contact first with the bag body. These front contour points 23p, 24p represent endpoints of contour lines 23v, front 24v of the separation tool 21 (see also Fig. 7A and Fig. 7B), which also makes contact with the front part 10v 5 of the area end 10e of the bag body 10. In this way the separation tool 21 separates the front part 10v to give a front corner flap 10j having the shape of an essentially isosceles triangle. The sides 10k, 10m of the front triangular corner flap 10j are defined as long as a front contour point of the separation tool is in contact therewith. In the case of the shape of the separation tool 21, selected in this embodiment, both the front contour points 23p, 24p as well as the front contour lines 23v, 24v of the separation tool

10 21 are in contact with the sides 10k, 10m. In passing, the isosceles triangle is an orthogonal isosceles triangle.

Fig. 4 shows the state in which the front corner flap 10j has been completely configured by the separation tool 21. In this representation it is also recognized that the isosceles triangular shape of the corner flap 10j is arranged symmetrically with respect to a line central M of the open end zone 10e. While the separation tool 21 forms the front triangular corner flap 10j, at the same time it folds a front area of the first

15 layer of the tube 10a on itself around the fold strip 12, so that this area of the layer of the tube 10a is again placed in the first plane ε1. Likewise, the separation tool 21 folds a front area of the second layer of the tube 10b to its original position in the first plane ε1. This starts the formation of the bottom side flaps 10u, 10t of the two layers of the tube 10a, 10b.

After the front triangular corner flap 10j has been formed, the separation tool 21 moves backwards

20 outside the front corner flap 10j by slowing down its movement with respect to the transport speed T, continuing the folding of the tube layers 10a, 10b and consequently progressing the formation of the bottom side flaps 10u, 10t from of the two layers of the tube 10a, 10b. Even before the separation tool 21 separates from the front corner flap 10j, the tip 10s of the front corner flap 10j arrives at a clamping device 28, which first holds the tip 10s and successively the entire flap corner 10j front in the defined form e

25 prevents the corner flap 10j from unfolding again. In this embodiment, the clamping device 28 is configured as a clamping band 28a that is oriented in the direction of transport T and rotates around two deflector rollers 28b, 28c, of which in fig. 3 to fig. 6 only the rear baffle roller 28b is shown. But fig. 10 shows the complete tightening device 28. By transporting the bag body 10 the entire end zone 10e is carried below the clamping device 28 along the central center line M, so that also

30 folded side flaps 10u, 10t folded are held in the defined shape and a deployment is prevented.

Fig. 5 shows a state of the process in which the separating tool 21 has moved in the open end zone 10e of the tubular bag body 10 both in the transport direction T with a reduced or negative V2R speed relative to the transport speed V, until it has reached the rear part 10h - seen in the direction of transport T - of the open end zone 10e, and has butted against the inner side of the tubular bag body with at least two contour points 23q, 24q defined in the separation tool, and has thus separated the aforementioned rear part 10h to give the rear corner flap 10p in the form of an essentially isosceles triangle. These contour points 23q, 24q posterior represent endpoints of the contour lines 23h, 24h posterior of the separation tool 21 (see Figs. 7A and Fig. 7B), which also come into contact with the rear part 10h of the area. end 10e of the bag body 10 and define the sides 10q, 10r of the rear triangular corner flap 10p. Saying

In passing, the isosceles triangle is an orthogonal isosceles triangle. As can be recognized from fig. 5, at this time the formation of the two bottom side flaps 10u, 10t is also completed.

The concept of "reduced or negative V2R speed relative to the transport speed V", as used above, means that the separation tool 21 moves in the transport direction, but with a lower speed than the transport speed V, or that the separation tool stops temporarily, or that the separation tool moves in

45 counterclockwise direction of transport T.

As depicted in fig. 6, after the rear triangular corner flap 10p has been formed, the separation tool 21 moves forward out of the rear corner flap 10p by relative acceleration of its movement V3R relative to the transport speed T, reaches the drive pulley 27 where it is carried in a circular arc movement to a position away from the end zone, then driven back along the branch

50 of the toothed belt 25, so as to form the open bottom of the next bag body (or the one that comes after the next one if two separating tools are provided, etc.).

As depicted in fig. 3 to fig. 6, as in fig. 7A and fig. 7B, the separating tool 21 is configured as a separate tool, two plates 23, 24 which free a space 21a from each other being mounted on one arm 22. At the edges of the plates 23, 24, the front and rear contour points 23p, 24p, 23q, 24q, and the front and rear contour lines 23v, 24v, 23h, 23h are also defined. The separate form of the separation tool 21 allows the clamping device 28 to extend through the space 21a and thus be able to contain and tighten the folded front and rear corner flaps 10j, 10p, as well as the side flaps background 10u, 10t,

as if, to prevent a collision with the separation tool 21, it should be arranged further downstream of the separation tool.

Fig. 8A and fig. 8B show an embodiment, which is located outside the invention, of a separation tool 30. The first alternative separation tool 30 differs from the separation tool 21 in the sense that only one is configured in the arm 22 plate 31 presenting the edges that define the contour lines 31vl, 31v front and contour lines 31hl, 31hr posterior. The separation tool 30 is therefore not a separate tool.

Fig. 9A and fig. 9B show a second alternative embodiment of a separation tool 32. The second separation tool 32, alternative, differs from the separation tool 21 in the sense that two oriented bars 33, 34 are configured in the arm 22 inclined, whose tips define the contour points 33p, 34p. The 10 bars 33, 34 are arranged with the space 32a with each other. Therefore, it is a separate tool and a clamping device can be driven through space 32a. Since each bar 33, 34 only defines a contour point 33p, 34p, the second separation tool 32, alternative, is only appropriate, depending on the mounting position, for the generation of a front or rear corner flap. To generate both the front corner flap and the rear corner flap, two alternative separation tools 32 must be combined, for example,

15 mounting one after the other and in reverse mounting position on the timing belt 25.

Fig. 11 shows an alternative clamping device 35 in the form of a clamping shoe made of a material with good sliding properties in reference to the bag body.

Fig. 12 shows another alternative tightening device 36 in the form of a rotating tightening roller.

Claims (20)

1.-Procedure for the configuration of an open bottom in an open end zone of a tubular bag body (10), bag body that is preferably made of a fabric of stretched plastic bands or a plastic sheet, in which the sack body is transported lying flat in a transport direction (T) transversely to its 5 longitudinal extension (L) with a transport speed (V), and during transport the final area (10e) to be folded from the tubular bag body is opened, comprising the introduction of a separation tool (21, 30, 32) in the open end zone of the tubular bag body, the movement of the separation tool in the transport direction (T) with a speed (V1R) increased relatively with respect to the transport speed (T), until the separation tool (21) stops against the inner side of the body 10 of tubular bag in the front part (10v) - seen in the transport direction - of the open end zone with at least two contour points (23p, 24p; 33p, 34p) defined in the separation tool, and separates thus the front part (10v) mentioned to give a front corner flap (10j) in the form of an essentially isosceles triangle, in which each side (10k, 10m) of the front triangular corner flap (10j) is in contact with at least one contour point (23p, 24p; 33p, 34p) front of the separation tool (21), 15 the movement of the separation tool (21) outside the front corner flap (10j) by relative slowdown of its movement with respect to the transport speed (V), and the tightening of the front corner flap (10j) generated, characterized because The separating tool (21, 32) is configured as a separate tool, with two plates (23, 24) 20 or bars (33, 34) being mounted on one arm (22) that free a space (21a, 32a) from each other , so that the clamping device (28, 35, 36) penetrates or it can pass through the space (21a, 32a) in the separation tool without colliding with it, and because the separation tool (21, 32) abuts against the inner side of the tubular bag body in a translational movement in the transport address (T). 2. Method according to claim 1, characterized in that the separation tool (21, 30, 32) moves in the area Open end (10e) of the tubular bag body (10) in the transport direction (T) with a reduced or negative speed (V2R) relative to the transport speed (V), until it reaches the part (10h) rear - seen in the direction of transport - of the open end zone, and abuts against the inner side of the tubular bag body with at least two contour points (23q, 24q; 33p, 34p) defined in the separation tool , and thus separates the aforementioned rear part (10h) to give a rear corner flap (10p) in the form of a triangle essentially 30 isosceles, each side (10q, 10r) of the rear triangular equine flap (10p) being in contact with at least one posterior contour point (23q, 24q; 33p, 34p) of the separation tool, the movement of the separation tool (21, 30, 32) outside the rear corner flap (10p) by relative acceleration of its movement with respect to the transport speed (V), and the tightening of the rear corner flap (10p) generated. 3. Method according to claim 1 or 2, characterized in that, from the layers of the tube (10a, 10b), bottom side flaps (10u, 10t) are formed in the open end zone, which extend on opposite sides of a center baseline (M). 4. Method according to one of the preceding claims, characterized in that before the opening of the final zone of the tubular bag body, this final zone (10e) is carried along a fold line that runs in the 40 transport direction from the first plane (ε1) of the bag body lying flat to a second plane (ε2) that runs essentially orthogonal to it. 5. Method according to claim 4, characterized in that a bottom side flap (10u) of the open end zone is formed by folding a first layer of the tube (10a) on itself along a fold line that runs in the direction of transport, and another bottom side flap (10t) is formed from a second layer of the tube (10b), while 45 that this second layer of the tube (10b) is folded in the plane (ε1) of the bag body (10) lying flat. 6. Method according to one of the preceding claims, characterized in that the separation tool (21, 30, 32) is driven away from the final area (10e) of the bag body after the formation of the corner flap (10j) triangular front and optionally also the corner flap (10p) triangular back. 7. Method according to one of claims 1 to 6, characterized in that the separation tool (21, 30, 32) is driven away from the front corner flap (10j) of the bag body only after fixing the tip (10s) of the front corner flap (10j) by means of a clamping device (28, 35, 36). Method according to one of the preceding claims, characterized in that the separation tool (21, 30) is equipped with front contour lines (23v, 24v, 31vl, 31vr) and optionally also contour lines (23h, 24h, 31hl , 31hr) posterior, which define sections of the sides (10k, 10m) of the front triangular corner flap (10j) and 5 optionally also sections of the sides (10q, 10r) of the rear triangular corner flap (10p). Method according to one of the preceding claims, characterized in that the opening of the final area of the tubular bag body is carried out by extending the layers of the tube (10a, 10b) in contact with each other of the bag body. 10.-Device (1) for the configuration of an open bottom in an open end zone (10e) of a bag body (10) 10 tubular, bag body that is preferably made of a fabric of stretched plastic bands or a plastic sheet, with a transport device (2) for transporting the bag bodies (10) in the flat lay state in a transport direction (T) transversely to its longitudinal extension (L) with a transport speed (V), and with an opening device (20) to open the final areas to be folded out of the tubular bag bodies during transport in the transport device, which comprises 15 a separation tool (21, 30, 32) that can be introduced into the open end zone (10e) of each tubular bag body during transport in the transport device, in which the separation tool (21, 30, 32) can be moved in the transport direction (T) with a speed (V1R) relatively increased with respect to the transport speed (V), until it reaches the part (10v ) front - seen in the direction of transport - of the open end zone, and stops against the inner side of the tubular bag body with the 20 minus two contour points (23p, 24p; 33p, 34p) defined in the separation tool, and thus separates the mentioned front part (10v) to give a front corner flap (10j) in the form of an essentially isosceles triangle , in which each side (10k, 10m) of the front triangular corner flap (10j) is in contact with at least one front contour point (23p, 24p; 33p, 34p) of the separation tool, and in which the separation tool (21, 30, 32) moves out of the front corner flap (10j) by relative slowing of its movement with respect to the transport speed (V), 25 and a clamping device (28, 35, 36) for tightening the generated front corner flap, characterized because The separation tool (21, 32) is configured as a separate tool, two plates (23, 24) being mounted on one arm (22)

or bars (33, 34) that leave a space (21a, 32a) free from each other, so that the clamping device (28, 35, 36) penetrates

or it can pass through the space (21a, 32a) in the separation tool without colliding with it, and because the separation tool

30 (21, 32) stops against the inner side of the tubular bag body in a translational movement in the transport direction (T). 11. Device according to claim 10, characterized in that the separation tool (21, 30, 32) can be moved in an open end zone (10e) of the tubular bag body in the transport direction (T) with a speed ( V2R) reduced or negative relative to the transport speed (V), until it reaches the rear part (10h) - seen in the transport direction - of the open end zone, and stops against the inner side of the body of tubular bag with at least two contour points (23q, 24q; 33p, 34p) defined in the separation tool, and thus separates the aforementioned rear part (10h) to give a rear corner flap (10p) in the form of a essentially isosceles triangle, each side (10q, 10r) of the posterior triangular end flap (10p) being in contact with at least one posterior contour point (23q, 24q; 33p, 34p) of the separation tool, and the tool being able to move separation (21, 30, 32) out 40 of the rear corner flap (10p) by acceleration (V3R) relative to its movement with respect to the transport speed (V), and a clamping device (28, 35, 36) being provided for tightening the flap of back corner generated. 12. Device according to claim 10 or 11, characterized by an end zone folding device, whereby the end zones (10e) of the tubular sack bodies (10) can be carried along a fold line that 45 runs in the transport direction (T) from a first plane (ε1) to a second plane (ε2) that runs essentially orthogonal thereto, the end zone folding device preferably comprising a folding strip (12) with an edge of fold that runs in the direction of transport (T) and at least one deflector plate (11a, 11b). 13. Device according to one of claims 10 to 12, characterized in that the separation tool (21, 30, 32) can be brought to a position removed from the final area of the bag body after the formation of the corner flap 50 (10j) triangular frontal and possibly also of the rear triangular corner flap (10p). 14. Device according to one of claims 10 to 13, characterized in that the separation tool (21, 30) has front contour lines (23v, 24v, 31vl, 31vr) and optionally also contour lines (23h, 24h, 31hl , 31hr) posterior, defining sections of the sides (10k, 10m) of the front triangular corner flap (10j) and optionally also sections of the sides (10q, 10r) of the rear triangular corner flap (10p). 15. Device according to one of claims 10 to 14, characterized in that the separation tool has an arm (22) and plates (23, 24, 31) and / or bars (33, 34) mounted on this arm, in which the contour points or 5 frontal contour lines are defined and optionally also the contour points or lines contour back. 16. Device according to claim 15, characterized in that the plates (23, 24, 31) and / or bars (33, 34) are arranged symmetrically with respect to the direction of transport. 17. Device according to one of claims 10 to 16, characterized in that the separation tool (21, 30, 32) is mounted on a rotating toothed belt (25) or chain drive oriented in the transport direction, 10 where the rotary drive can be accelerated or relatively slowed relative to the transport speed (T). 18. Device according to claim 17, characterized in that two separation tools are provided, of which each separation tool is operated by drive units separated by one or more toothed belts or roller chains that rotate in parallel. 19. Device according to one of claims 10 to 18, characterized in that the clamping device (28, 35, 36) 15 comprises clamping straps, clamping rollers and / or sliding clamping elements. 20. Device according to one of claims 10 to 19, characterized in that the opening device (20) comprises suction devices (13, 14) that can be connected and disconnected, which can be supplied respectively to a layer of the tube (10a, 10b) in the final zone (10e) of the tubular sack bodies (10) and, after contact with the corresponding tube layer and activation of the suction effect, they can be moved away from each other transversely to the 20 transport direction (T) and can be moved with the transport speed (V) in the transport direction (T). 21. Device according to one of claims 10 to 20, characterized in that the central axes of the suction devices (13, 14) are arranged in the transport direction T in a congruent way or offset one behind the other, preferably stripped.