EP3551446A1

EP3551446A1 - Bag production device and method

Info

Publication number: EP3551446A1
Application number: EP17828860.1A
Authority: EP
Inventors: Willi Vollenkemper
Original assignee: Haver and Boecker OHG
Current assignee: Haver and Boecker OHG
Priority date: 2016-12-08
Filing date: 2017-12-08
Publication date: 2019-10-16
Anticipated expiration: 2037-12-08
Also published as: US20200262594A1; EP3551446B1; DE102016123805A1; WO2018104515A1; CN110049861B; US20230249861A1; ES2959989T3; CN110049861A; CA3044550A1; US11643234B2

Abstract

The invention relates to a device and to a method for producing open bags (2), comprising a storage apparatus (3) having a reserve supply (4) of bag film (5), a control apparatus (60) for control, a transport apparatus (6) for transport of the bag film (5) and/or of the bag body (16) along a transport track (7), a welding apparatus (8) having welding means (9, 10) for introducing a bottom seam (11) into the bag film and a cutting apparatus (12) having a cutting means (13, 14) for separating a predetermined film length (15) of the bag film (5) in order to form a bag body (16) of an open bag (2). The control apparatus (60) controls the transport apparatus (6) such that a relative movement of the bag body (16) and bag film (5) is effected and a distance (37) between the bag body (16) and the bag film (5) is created before introducing the bottom seam (11). The control apparatus (60) controls the transport apparatus (6) and the welding means (9, 10) such that the welding means (9, 10) extend at least to the bottom end (23) of the bag body (16) during welding of the bottom seam (11).

Description

Sack making device and method

Besehreibung

The present invention relates to a sack making apparatus and a method for the production of open sacks as well as open sacks produced therewith. Such a sack-making device is used in particular on or for an FFS system (form-fill-seal) in order to produce the required open sacks on site when filling bulk materials into open sacks. It is also possible to produce sacks in stock with the sack-making device according to the invention and to temporarily store them for later use.

In particular, in the produced open sacks

Food filled. Particularly preferably, filling of powdered foodstuffs such as, for example, milk powder, dextrose, starch, etc. takes place in the open sacks. When filling food and especially baby food, high hygienic standards must be observed. An with

Food filled sacks should as little as possible

Dirt particles can adhere.

In the production of open-mouth bags is usually a

Tubular film used in a transport direction

is transported. At a bottom seam welding station, a bottom seam is first introduced into the tubular film.

Subsequently, the tubular film is a bag length

weiteretaktet and it will be the next bottom seam in the

Tube film introduced while at the same time just below the bottom seam is cut through the tubular film, creating the first open bag. In the following, the open bag is filled from above with the contents and a

Welding device is welded to the headboard. The method works in principle, but has the disadvantage that at least a small film supernatant is present at the bottom seam. The two layers of the film supernatant together form a receiving space or a plurality of receiving spaces or cavities, on or in which dirt particles or else to be filled

Bulk goods can set, so no perfect

Hygienic conditions are present.

Such a film projection could be prevented by an edge-tight welding of the bottom seam. The attempt to cut off the film immediately adjacent to the weld often results in the head end of the open pack being closed in front of it, or that one (lower)

Film supernatant is still present at the bottom seam.

In principle, it is conceivable to cut off the film overhang at the bottom seam in retrospect, but due to the small projections an automatic process is difficult to implement or the film consumption increases

considerably. In addition, remnants would be incurred, which would have to be disposed of consuming.

Another possibility is, in addition to the first

Bottom seam welding station in the transport direction later to use a second bottom seam welding station, which welded together the film projections. But that increases the effort

considerably and additionally reduces the efficiency of the plant.

It is therefore the object of the present invention to provide a sack making apparatus and a method for the production of open-sacks, as well as open socks produced therewith, whereby the production of open-sacks with

improved hygiene is made possible. This object is achieved by a bag making apparatus having the features of claim 1 and by a method having the features of claim 13. The open bag according to the invention is the subject of claim 20. Preferred developments of the invention are the subject of the dependent claims. Further advantages and features of the present invention will become apparent from the general description and the description of the

Embodiments.

The bag-making device according to the invention serves for

Production of open sacks and includes a storage device with a supply of bag film. A control device is used for control. Furthermore, at least one transport device is provided for transporting the bag film and / or the bag body along a (predefined) transport path. It is

(At least) provided a welding device with welding means for introducing (at least) a bottom seam in the bag film. Furthermore, (at least) a cutting device with (at least) a cutting means for separating a predetermined film length of the bag film to form a

Sack body of an open bag provided. The control device is designed and configured to control the transport device in such a way that a relative movement of the bag body and the bag film relative to each other is effected and in front of the

Introducing the bottom seam creates a gap between the bag body and the bag film. The control device is set up and designed to control the transport device and the welding means such that the welding means extend at least as far as the bottom end of the bag body during welding of the (edge-sealed) bottom seam and / or extend beyond.

It is possible and preferable for the cutting means to be arranged and effective at least during the cutting of the bag film within a longitudinal section of the transport path, in which case

(Longitudinal section) arranged the welding means during welding and are effective. The bag making device according to the invention has many advantages. A considerable advantage of the invention

Sackherstellvorrichtung is that the

When welding the bottom seam, welding means extend at least as far as the bottom end of the bag body. This can be ensured by the fact that the cutting means during

Cutting is located in the same longitudinal section as the

Welding agent.

By or at least one transport device ensures that during welding, a distance between the bag body and the bag film is present, the one

Welding of the front end of the bag film prevented.

In this case, preferably, the bag film is moved back to produce the (predetermined) distance after cutting and before welding.

In particular, the cutting device and the

Welding device arranged in an overlapping longitudinal portion of the transport path and effective. In all

Embodiments is particularly preferably an edge density

Achieved welding. This can be ensured by the fact that the welding means protrude beyond the end of the film and thus the film to the bottom end and including the

Weld bottom.

In particular, the bag body within the bottom seam is welded to the bottom end of the entire surface. Then there are at the end not two layers of the film from where and between which can accumulate dust. Thus, a weld without outer film projection is produced.

To set a (defined and / or predetermined) distance, it is also possible that the (separated)

Sack body by the (predetermined) distance (along the

Transport path) is moved relative to the bag film, while the bag film z. B. is not moved forward. Then the bag body is advanced by the predetermined distance until the bottom end arrives at the welding means and at

Welding is an edge-tight welding of the bottom seam or a down to the bottom end of the bag body extending full-surface bottom seam is generated.

By a relative movement of the bag body and bag film relative to each other before introducing the bottom seam, the desired distance between the bag body and the bag film is formed. This free distance is so great that the front end of the bag film is not welded. The distance is

in particular greater than 2 mm and preferably greater than 5 mm or 10 mm. The distance can also be greater and z. 15 mm or 20 mm or 30 mm or 300 mm or 500 mm or more

be. In principle, the distance is arbitrary, as long as it is ensured that the welding means completely weld the bottom end to the edge.

Preferably, the welding device comprises welding jaws and in particular two welding jaws as welding means. The

Welding jaws preferably extend across the

Sack film and in particular beyond on both sides to the outside.

Preferably (at least) a fixing means is provided for fixing the bag film to the transport path in front of the longitudinal section. In particular, (at least) a fixing means for fixing the bag film to the transport path after the

Longitudinal section provided. Such a fixing agent can be formed for example by a pipe or a profile. For example, a rubber coating or the like may be formed on the profile or tube in order to securely fix the bag film. The fixing agent can punctually the bag film

fix. It is possible and preferable for the fixing agent to fix the bag film linearly or flatly, so that one or each (even slight) local displacement of the

Sack film is prevented. Preferably, the longitudinal portion is defined by a length of

Welding agent along the transport path or in

Transport direction defined. Preferably, the two are

Welding agent constructed essentially identical or mirror-symmetric or point-symmetrical. Preferably, the two welding means have at least substantially the same dimensions. But it is also possible that the two welding means have a different length in the direction of the transport path. Then, the longitudinal section is defined by the shorter length of the two welding means or by the overlapping length of the two welding means.

In all embodiments, it is preferred that the

Longitudinal section extends over a length of more than 5 mm or more than 10 mm. The longitudinal section may in particular extend over a length of between 2 mm and 50 mm and preferably between 5 mm and 30 mm. A length of

Longitudinal section depends in particular on the dimensions of the offensive bag.

In particularly preferred embodiments, the welding means extend during welding (in the longitudinal direction of the bag film) beyond the bottom end of the bag body. As a result, an edge-tight welding of the bottom end of the bag body is possible and guaranteed. As a result, film overhangs on the bottom seam are reliably avoided.

Preferably, a seam length of the bottom seam is shorter than the longitudinal portion. Seam lengths between 2 mm and 15 mm and in particular between 3 mm and 10 mm are particularly preferred. For large open sacks, the seam length can also be larger.

In all embodiments, it is preferred that the bag film is formed as a tubular film, and that the

Storage device a receptacle for (at least) one

Film roll and in particular hose roll comprises. It is conceivable it also to produce the open sacks of a film web, which is folded over and provided with a longitudinal weld.

In all embodiments, it is possible that the

Sackherstellvorrichtung at least one

Eckennahtschweißeinrichtung includes to corner seams in the

Introduce bag film, so in the filled state

rectangular bags are obtained. It is also possible to dispense with a Eckennahtschweißeinrichtung or a

Film roll with prefabricated Eckenabschweißungen too

use.

In all embodiments, it is preferred that the

Sackherstellvorrichtung comprises at least one film storage with a movable or pivotable tensioning roller. It is also possible that two or more tension rollers are provided. The idler or idlers may be biased by a weight or spring or the like. Of the

Foil storage can be part of a bag length or a

Bag length or more to compensate for a partial

continuous operation or continuous operation or continuous rotation of the film roll or

To allow hose roll on the storage device. It is possible and preferred, however, that the film roll

(Hose reel) is operated clocked and a piece is widely rotated for each individual open bag.

In preferred embodiments, a hitch is included to an open bag to a filler neck of a

Attach the filling system. It is also possible that two or more hitches are provided.

The inventive method is used for the production of

Open sacks from a supply of bag film, wherein the bag film is transported along a transport path and wherein with (at least) a cutting means of a cutting device, a predetermined length of film is separated from the bag film to to form a bag body of an open bag. The bag film is moved relative to the bag body. By welding, a bottom seam is introduced to the bottom end of the bag body to form an open bag.

The method according to the invention also has many advantages. The process can be used to produce open-sacks that meet high hygienic standards.

Preferably, the bag film is withdrawn from the separated bag body in particular defined before the bottom end is welded. It is also possible that the bag film is withdrawn from the separated bag body Undefined, for example, by the associated drive is activated for a certain period of time or the like. During the subsequent further transport of the bag film, for example, an optical sensor or the like can detect the leading edge of the bag film again and thus a defined positioning of the

Allow the leading edge of the bag film.

The fact that the bag film is withdrawn from the separated bag body, an edge-tight welding of the bottom seam can be ensured while simultaneously

It is ensured that the front end of the bag film is not welded, which is the head of the next

Offensacks forms.

In preferred embodiments, the film or the bag body is fixed before the separation of the bag body. In particular, the bag film is in the region of the bag body and it is also fixed the bag film in front of it. Such a fixation can be done, for example, by using appropriate

Fixative or a pipe or rail or

The same is pressed from above on the bag film, so that the bag film is kept defined. Then, at the

Separating the bag body no unwanted displacement of the bag body or the bag film occur. Preferably, the fixation of the bag film in front of the bag body is canceled before the bag film is withdrawn. In particular, the bag body remains fixed while the

Sack film is withdrawn.

When welding, the welding means preferably extend at least as far as the bottom end of the bag body. In particular, the welding means are beyond the bottom end of the bag body during welding.

In particular, the bottom seam of the bag body is welded edge-sealed to the bottom end. Within the bottom seam is preferably welded over the entire surface.

In all embodiments, it is preferred that the bag body first separated and then the bottom seam is introduced.

An open-mouth bag according to the invention is produced by one of the methods described above and comprises one

at least partially consisting of bag film bag body, wherein a bottom end of the bag body is closed by a bottom seam. In particular, the open sack can comprise a rim-tight weld seam (extending as far as the bottom end) on the bottom seam. A filled with bulk material and closed at the head bag can also have a border-tight top seam.

In all embodiments, the bag body of the offset bag may include gussets and / or corner welds.

Overall, the invention provides an advantageous

Sackherstellvorrichtung, an advantageous method and advantageous open-sacks available, so that a hygienic filling of bulk materials and in particular powdery foods is made possible in open sacks. The finished

Open sacks have no film overhangs at the bottom seam where particles or dirt can stick. During production, the film feed of the bag film is up to about one bag length over the cutting plane of the

Cutting device addition. There is a lowering of the example designed as a press-fixing. in the

Following this, the bag body is cut off from the bag film with the cutting device. It follows a release of the

Fixiermittels or Pressbügels, which rests against the bag film, while the other Anpressbügel the bag body still fixed. Subsequently, the bag film is pulled back a little, to such an extent that the front end of the bag film is no longer in the effective range of the welding device for the bottom seam. The conveyed back length of the bag film is temporarily stored by the film storage. This is followed by the welding of the bottom seam, in which case the welding agent completely cover the bottom end and even beyond, so that a welding of the bottom seam takes place edge-tight to the extreme end. This means that the superimposed film layers are completely welded together to the extreme end.

The finished bag body is transported with the open side forward in the transport direction of the transport path. The bag film is then moved forward again, so that a (new) bag body is again completely in front of the cutting plane. The feed of the bag film can be sensor-controlled or, for example via a servo drive or the like, so that a well-defined positioning of

Sack film is possible.

The bag making apparatus may include a film storage, so that a continuous operation of the film roll or

Hose reel is possible. But it is also possible that a start / stop operation of the film or hose reel is provided.

Further advantages and features of the present invention will be described below with reference to the embodiment, which is explained below with reference to the accompanying figures.

In the figures show:

Figure 1 is a schematic perspective view of a

Filling plant of the invention

SackherstellVorrichtung ·

Figure 2 is a schematic perspective view of

Sack making device according to Figure 1;

3 shows a schematic cross section through the

Sack making device according to Figure 2;

Figure 4 is a schematic plan view of the bag film;

FIG. 5 shows a longitudinal section through the bag-making device according to FIG. 2 in the region of the cutting device;

FIG. 6 shows a perspective view of the welding device and the cutting device of the sack-making device according to FIG. 2; and

Figure 7 is a view of the cutting device and the

Welding device according to Figure 6 from behind.

Figure 1 shows a schematic perspective view of a filling plant 100, which comprises a Vorsilo 104 and a coarse stream 101 and a fine stream 102 to bulk goods and in particular powdered food in open sacks

to fill.

The filling plant 100 comprises a sack-making device 1. The sack-making device 1 precedes the actual filling and produces individual rolls from a film roll or, in this case, hose roll 21 with wound-up bag film 5 Open sacks 2 (see Figure 4), which after attachment with the hitch 26 through the filler neck 110 of

Filling 100 are filled with the bulk material to be filled.

The filling system here comprises rotating filler neck 110, which are rotated clocked to the individual stations. After being attached to a first filler neck, the filling is carried out in the coarse stream at the next station before the filling is carried out in the fine flow after further indexing. Both at the station with the filling in the coarse stream as well as at the station for filling with fine flow at least one compression device is provided in each case in order to effect a compression of the bulk material in the open bag during the filling process. At the fourth station, the bag is transported away at the Sackabfuhr 105.

The bag making device 1 comprises a frame 30, on which a storage device 3 with the supply 4 is arranged. The supply 4 here consists of the hose reel 21, on which the bag film 5 designed here as a tubular film is stored wound up. The tubular film 5 is along the

Transport path 7 transported by at least one transport device 6. In simple cases, the

Transport device of one or two driven

Transport rollers that transport the tubular film along the transport path 7 targeted.

A Eckennahtschweißeinrichtung 22 may be provided to introduce Eckenabschweißungen 28 in the tubular film in the filled bag in conjunction with the gussets 27th

(see Figure 4) provide a cuboid filled bag.

For deflecting the bag film 5 serve pulleys 31. A

Foil accumulator 24, which here comprises a pivotable tension roller 25, serves for length compensation for different

Sack lengths that are produced with the Sackherstellvorrichtung 1. Optionally, the film memory 24 also several Tension rollers 25 include, so that a continuous rotation of the hose reel 21 is made possible while the open sack 2 is made in the sack making device 1. In any case, the retracted before welding foil length can be cached in the film memory.

With the welding device 8 shown here, the visible in Figure 4 bottom seam 11 in the bag body 16th

brought in .

FIG. 2 shows a schematic perspective view of the sack making device 1 from FIG. 1. The imprints 33, which are shown by way of example on the hose reel 21, are clearly visible

Tubular film 5 of the hose roll 21 are printed.

The bag film 5 is transported by the transport device 6 along the transport path 7 and deflected at the deflection roller 31. Subsequently, the bag film 5 comes to the

Eckennahtschweißeinrichtung 22, with which the corner seams or Eckenabschweißungen 28 (see Figure 4) are introduced into the bag film. Whenever desired. Without

Eckennahtabschweißungen form after filling so-called pillow-shaped bags. Eckfahtabschweißungen form more box-shaped bags. In combination with

Peelable two-ply foils as a bag wall, so high hygienic requirements sacks.

The transport device 6 comprises here a driven

Roller with which the bag film 5 is transported along the transport path 7. A further transport device 45 in the form of a drive unit 45 can be seen in FIG.

The tension roller 25 of the film storage 24 can be seen in the lower region of the bag making device 1. After the second guide roller 31 is a horizontal

Transporting the bag film 5 along the transport direction of the transport path 7, so that the bag film 5 is transported horizontally through the welding device 8. With the

Welding device 8, a bottom seam 11 is introduced into the bag body 16 (same Figure 4).

At the front end of the bag making device 1 is the

Towing device 26 shown, which serves to receive the front end lying opener bag 2 and spend by pivoting about the illustrated horizontal axis from the lying position to a suspended position. At the same time, the front open end 40 of the open sack 2 is opened by the suction cups, so that the open sack 2 is attached to a filler neck 110 of a filling system.

Figure 3 shows a longitudinal section through the

The sack making device 1 of FIG. 2 is unwound from the roller 21 and guided by the corner seam welder 22, where corner wefts 28 (FIG. 4) are introduced into the sack film 5 as needed. After passing through the film storage 24, the transport device 6 closes here with the

Drive unit 42, which ensures the transport of the bag film 5.

The bag film is then passed through the welder 8

transported, and indeed so far that the bag film exactly one bag length extends to a cutting plane 50 (Fig. 4) of a cutting device 12 not shown here. The cutting device 12 will be explained in more detail with reference to Figures 4 to 7.

Fixing means 18 and 19 serve to fix the bag film in front of and behind the welding device 8. The

Welding device 8 comprises welding means 9 and 10, which Cylinders 35 and 36 are movable toward and away from each other.

FIG. 4 shows a schematic plan view of the bag film and the cutting device 12. First, the bag film is transported to the front end on the head end 39 shown here

forwarded at. The bag film 5 is then fixed by the fixing means 18 and 19 shown in FIG. Subsequently, the cutting device 12 is activated and moved here across the bag film 5, so that the cutting means 14 the

Sack body 16 separates from the bag film 5. After this

Cutting process is the cutting device 12 on the other longitudinal side of the bag film 5 in the dashed line

position shown. For the next cutting operation, the cutting device is then moved in the opposite direction and cuts the bag film 5 in the cutting plane 50 with the cutting means 13.

After cutting off the bag body 16 from the bag film 5, the bag film 5 is transported via the transport device

withdrawn, so that a distance 37 results from the bottom end of the bag body 16 to the front end 41 of the bag film 5. This distance 37 is dimensioned so that the now front end 41 of the bag film 5 outside the

Longitudinal section 17 is located. The longitudinal section 17 is

in particular defined by the longitudinal overlap of the welding means 8, preferably designed as welding jaws. The cooperating welding means are driven together for welding and act in the longitudinal section 17. There they weld the superimposed layers of the bag film 5 together. In this case, the longitudinal portion 17 is dimensioned or the bottom end 23 of the bag body 16 is arranged so that at the bottom end 23, the layers of the bag film are completely welded together. The result is a edge-tight weld, so no unwschweißter foil overhang at the weld more

occurs. This allows a high level of hygiene. Particles and dirt can not be deposited and collected between a film overhang of several layers, since all layers are welded together tightly to the outermost edge.

After the welding of the bottom end 23 or the introduction of the bottom seam 11, the bag body 16 of the offensive bag 2 can be transported further in the direction of the filling system or, alternatively, for example supplied to a supply.

The now front end 41 of the bag film 5 is then at the distance or the distance 37 plus a bag length 15 in

Direction of the transport path 7 further transported, so that the front end of the bag film 5 is then in the illustrated position of the head end 39. An abutment of the front free end 41 to the transport surface may, for. B. be prevented by not recognizable here bevels. in the

Following fix the fixing means 18 and 19 the

Sack film 5. Subsequently, the next bag body 16 is separated by the cutting device 12. Thereafter, the bag body 16 is still fixed with the front fixing, while the rear fixing is released and the bag film 5 is retracted again by the distance 37, so that the next bottom end 23 with an edge-tight bottom seam 11th

can be provided.

The cutting device and in particular the cutting means 13 and 14 are located at least during the cutting process in the cutting plane 50, which is located within the longitudinal section 17. In the longitudinal section 17, the welding means of the welding device 8 act. In any case, there is a seam length 38 of the bottom seam 11, which ensures sufficient stability.

The cut bag body 16 is connected to the drive unit

45 (as a further transport device) over the transport surface

46 is transported to the hitch 26 (see Fig. 3). Figure 5 shows a schematic cross section through the

Welding device 8 and the cutting device 12 of the

Sackausstellvorrichtung 1 from Figure 2. The welding jaw 9 is moved by the cylinder 35 from the spaced position shown here in a welding position, not shown here, in which the welding jaws 9 and 10 directly abut the bag film 5 located therebetween. The length 20 of the welding means 9 and 10 defines the longitudinal section 17.

Within the longitudinal section 17 is the cutting plane 50. The cutting means 13 and 14 are at least there when they perform a cutting operation. It is also conceivable that the cutting means 13 and 14 and also the

Welding agents 9 and 10 in other levels and positions

when they are not active. In any case, it is important that a longitudinal section 17 results within the welding position, within which the cutting plane of the cutting means 13 and 14 is located.

The welding jaws 9 and 10 can on the top

for example, be coated with Teflon and on a

Insulator be applied. But it is also possible that a coated sweatband or other suitable

Welding equipment such as ultrasound, permanently heated

Welding jaws, etc. are used.

Alternatively it is also possible that the dashed

drawn welding means 9 and 10 of a welding device are arranged offset by a predetermined distance 37 in the transport direction of the film forward. In such an embodiment, the solid lines are drawn

Welding agent 9 and 10 not necessary. After cutting the film and generating a bag body with the cutting means 13 and / or 14 of the bag body 16 z. B. with the

Transport device 45 (see Fig. 3) by a predetermined or defined distance 37 (in the transport direction or along the transport path 7) moves forward, while the bag film preferably retains its longitudinal position. Then by means of the dashed lines shown welding jaws 9 and 10, the bottom seam 11 is introduced into the bottom end 23, wherein also in this variant, the welding means protrude beyond the bottom end 23 during welding. Thus, a weld is introduced into the bottom end of the bag body in the region of the bottom seam over the entire surface and welded to the absolute bottom end 23 out.

FIG. 6 shows a schematic perspective view of the welding device 8 and also of the fixing means 18 and 19, which can be moved in each case via one of the cylinders 44 between the fixing and the releasing position. One or more adjustable spacers or adjustment sleeves can

be provided to the appropriate settings

make and allow a fine adjustment. The

Fixing means 18 and 19 here comprise in each case a linkage and a mechanism to which a tubular fixing means for direct contact with the bag film or the bag body is respectively provided at the end.

FIG. 7 shows a view from FIG. 6, wherein the cutting device 12 can also be seen laterally here, which is arranged laterally transversely to the longitudinal extension of the bag film 5.

Overall, the invention provides an advantageous

Sackherstellvorrichtung and an advantageous method for the production of open-mouth bags available, whereby a high standard of hygiene can be achieved. The production of the bags is efficient and does not require much equipment, although the bags can be closed edge-tight. Bezugszeichenl

1 bag maker 27 gusset

2 open bag 28 corner weld

3 storage device 30 frame

4 stock 31 pulley

5 bag film, tubular film 32 control cabinet

6 Transport device 33 Imprint

7 transport path 34 pipe

8 welding device 35 cylinders

9 welding agents, 36 cylinders

Welding jaw 37 distance, distance

10 welding agents, 38 seam length

Welding jaw 39 head end

11 bottom seam 40 open end

12 cutter 41 end

13 cutting means 42 drive unit

14 cutting means 43 insulating layer

15 foil length 44 cylinders

16 bag body 45 transport unit ^"

17 longitudinal section drive unit

18 fixing agent 46 transport surface

19 Fixing agent 50 cutting plane

20 length of 9, 10 60 control device

21 Film roll 100 Filling plant

22 Corner seam welding 101 Coarse flow

Device 102 fine flow

23 bottom end 103 turnstile

24 foil storage 104 prep

25 tension roller 105 Sackabfuhr

26 Towing hitch 110 Filler neck

Claims

Claims :

A sack-making device (1) for producing open sacks (2), comprising a storage device (3) with a supply (4) of sack film (5),

a control device,

a welding device (8) with welding means (9, 10) for introducing a bottom seam (11) into the bag film,

a cutting device (12) having a cutting means (13, 14) for separating a predetermined length of film (15) of the bag film (5) to form a bag body (16) of a

Open bag (2),

at least one transport device (6) for transporting the bag film (5) and / or the bag body (16) along a transport path (7),

characterized,

in that the control device (60) is set up and designed to control the transport device (6) in such a way that a relative movement of the bag body (16) and bag film (5) is effected and before the introduction of the

Bottom seam (11) creates a gap (37) between the bag body (16) and the bag film (5), and that the

Control device (60) is adapted and configured to control the transport device (6) and the welding means (9, 10) in such a way that the welding means (9, 10) at least until the bottom end (23) during welding of the bottom seam (11) ) of the bag body (16).

2. Device (1) according to claim 1, wherein the welding device (8) comprises welding jaws as welding means (9, 10).

3. Device (1) according to one of the preceding claims,

wherein a fixing means (18) for fixing the bag film to the transport path in front of the longitudinal section (17) is provided and / or wherein a fixing means (19) for fixing the

Sack film (5) on the transport path (7) after the Longitudinal section (17) is provided.

4. Device (1) according to one of the preceding claims,

wherein the longitudinal section (17) extends through a length (20) of the welding means (13, 14) along the transport path (7).

is defined.

5. Device (1) according to one of the preceding claims,

wherein the longitudinal portion (17) extends over a length of more than 5 mm or more than 10 mm.

6. Device (1) according to one of the preceding claims,

wherein the longitudinal section (17) extends over a length between 2 mm and 50 mm and in particular between 5 mm and 30 mm.

7. Device (1) according to one of the preceding claims,

wherein the welding means (9, 10) extend beyond the bottom end (23) during welding in the longitudinal direction of the bag film of the bag body (16).

8. Device (1) according to one of the preceding claims,

wherein a seam length (38) of the bottom seam (11) is shorter than the longitudinal portion (17).

9. Device (1) according to one of the preceding claims,

wherein the bag film (5) is formed as a tubular film and wherein the storage device (3) comprises a receptacle for a film roll (21).

10. Device (1) according to one of the preceding claims,

wherein at least one Eckennahtschweißeinrichtung (22) is provided.

11. Device (1) according to one of the preceding claims,

wherein a foil store (24) with a pivotable Tensioning roller (25) is provided.

12. Device (1) according to one of the preceding claims,

wherein a hitch (26) is included to attach an open bag (2) to a filler neck (101).

13. A process for the production of open-mouth socks (2) from a

Stock (4) on sack film (5), wherein the sack film (5) is transported along a transport path (7) and wherein with a cutting means (13, 14) of a cutting device (12) a predetermined film length (15) of the sack film (5 ) is separated to a bag body (16) of a bag Offensacks

(2) and wherein the bag film (5) moves relative to the bag body (16) and welds a bottom seam

(11) up to the bottom end (23) of the bag body (16)

is introduced to form an opening bag (2).

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

Sack foil (5) from the separated bag body (16)

is retracted before the bottom end (23) is welded.

15. The method according to one of the two preceding claims, wherein prior to the separation of the bag body (16) of the

Sack film (5) the bag film (5) in front of the bag body (16) and / or the bag film (5) in the region of the bag body (16) is fixed.

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

Fixing the bag film (5) in front of the bag body (16)

is canceled before the bag film (5) is withdrawn.

17. The method according to any one of the four preceding claims, wherein the welding means (9, 10) extend to at least the bottom end (23) of the bag body (16) during welding and

especially beyond.

18. The method according to any one of the five preceding claims, wherein the bottom seam (11) of the bag body (16) edge welded to the bottom end (23) is welded.

19. Method according to one of the six preceding claims,

wherein the bag body is first separated and then the bottom seam (11) is introduced.

20. Open bag (2) produced by a method according to one of the seven preceding claims, comprising a bag body (16) consisting at least partially of bag film (5), the bag body (16) being formed by a bottom seam (11).

is closed.

21. open sack (2) according to the preceding claim, wherein the bottom seam (11) extends up to the bottom end (23)

extending edge-sealed weld.

22. open sack (2) according to one of the two preceding claims, wherein the bag body (16) gussets (27) and / or

Corner welds (28) includes.