EP0169464A2 - Device for producing and filling bags - Google Patents

Abstract

First a half tube with a label fold (2) and a bag fold (3) is produced, the free edges of which overlap one another, the free edge of the bag fold (3) being on the outside. The labels 6 inserted in the longitudinal direction of the half tube control the advance of the half tube in the device such that separating weld seams (4) and subsequent perforations (5) are produced between successive labels (6). After the bags have been filled, a sealed weld seam (7) is made to seal the bags.

Description

The invention relates to a device for the production and filling of bags, which are provided with - preferably stiff - label strips and are produced from a half-tube consisting of plastic film, by means of separating weld seams which are attached transversely to its extension - by means of appropriate welding jaws - into the first open bags on the open side of the half-tube and after filling by seal welding - by means of appropriate seal-welding jaws - the bags are divided.

Appropriate devices are available on the market. However, the economy of the known devices is unsatisfactory insofar as a relatively high outlay is necessary to apply the labels.

In some cases, the labels are even attached manually to already filled bags by placing a roof-like folded cardboard strip with labeling over an edge of the bag and attaching it there using staples. If the filling of the bag has a greater weight and the bag or the like by means of an opening in the label for the presentation of the sale on hooks. is hung up, the bag looks slightly unsightly because the filling weight tries to detach the bag from the fastening clips on the label.

It is also known to mechanically weld cardboard strips folded like roofs by heating a plastic coating located on the inside of the cardboard fold to the already filled bags. Here, however, comparatively expensive special cartons are necessary, the thickness of the carton cannot be chosen freely because the heating of the plastic coating for welding the cartons to the bags must take place through the corresponding heat-resistant carton.

In addition, there are devices which, after manufacture of bags open on one side, first insert a label into the bag and then weld the bag walls above the label to one another, shortening the bag, so that the label is captively enclosed by the film forming the bag. The goods to be packed are then filled into the bag and the bag opening is sealed by seal welding. This device is relatively difficult to convert to different bag sizes because the labels are inserted to different lengths with bags of different lengths and the sealing seam dividing the label receiving space from the rest of the bag must be made at a correspondingly different distance from the bag opening. In addition, this sealing seam must be applied with relatively great care if it is to be avoided that filling material can get into the label receiving space during the subsequent filling of the bag.

It is therefore an object of the invention to provide a device which allows bags with labels made of any material, in particular normal cardboard, to be produced in a particularly simple manner, in which case the device can in particular be easily converted for different bag sizes.

This object is achieved in that by means of a - arranged as part of the device - form shoulder for the production of the half-tube, both edge strips of a film web which can be drawn over the form shoulder, with the formation of two U-folds which overlap one another with their free edges, can be folded over, that the labels are conveyed by means of a label feed member in synchronism with the advance of the half-tube moving along a conveying path through its end opening on the film web side in one fold (label fold) can be inserted with the free edge covered on the outside by the other fold, and that the separating weld seams that can be attached behind each inserted label - by means of the separating welding jaws - extend over the entire width of the other fold (bag fold) up to an area of the label fold between successive ones Labels - but excluding part of the label fold - are extended.

According to the invention, the bag fold can have any dimensions transversely to the forward direction without this having any influence on the label feed because the label is inserted at the same place in each case.

In addition, a pouch tape is inevitably formed in the manufacture of the pouches in that adjacent pouches are connected to one another in a band-like manner over a partial area of the label fold. The labels arranged in the label fold stiffen the band-shaped connection in sections in each case to a length corresponding approximately to the dimension of the bag opening in the forward direction. This gives the bag band a chain-like structure with relatively stiff chain links formed by the labels, which are flexibly connected to one another via the partial areas of the label fold mentioned.

According to a preferred embodiment, it is provided that the separating welding jaws work synchronously with perforating jaws, which are arranged in continuation of the separating welding jaws in the region of the part width of the label fold which is recessed by the separating welding jaws in order to produce a perforation which continues in a line-like manner. This perforation has on the Handling of the bag band has no influence, but facilitates the later separation of the bags from the bag band.

The label feed member is expediently designed or arranged in such a way that the labels can be advanced from a position outside the half-tube into a transfer position within the half-tube, from which the labels are taken along by frictional engagement with the label fold when the half-tube is advanced. Special measures for holding the labels in the label fold are therefore unnecessary.

In a structurally particularly simple manner, a channel comprising a label edge can be arranged as the feed element, in which the label can be moved into the transfer position by means of a stamp guided parallel to the channel.

In a particularly preferred embodiment of the device according to the invention, a light barrier is arranged in the forward direction behind the transfer position as part of a control of the intermittent feed of the half-tube, in order to advance the feed when the light path of the light barrier is released after passing the rear edge of a label in the forward direction with activation of the separating welding jaws Interrupt the execution of the separating weld seams and switch on again when the light path is interrupted again through the front edge in the forward direction of the next label pushed into the transfer position. With this type of feed control, the dimension of the bags in the feed direction is automatically adapted to the corresponding dimension of the labels. No measures are required to convert the device.

At a filling station for filling the bags, which is arranged in the forward direction after the separating welding jaws, the label fold can be guided on a curved web with a center of curvature on the side of the bag belt facing the free edges of the U-folds, in such a way that the web guiding elements provide the free one Try to press the edge of the label fold transversely to the direction of advance against the labels without grasping the free edge of the bag fold lifting off from the free edge of the label fold due to the curvature of the web.

In an advantageous embodiment, a blower with a blowing direction leading away from the label fold can be directed against the free edge of the bag fold in order to forcibly hold the edge of the bag fold in the lifted-off position by the blower flow trying to inflate the bag.

• Fig. 1 eine Seitenansicht des herzustellenden Beutelbandes,
• Fig. 2 ein Schnittbild der Beutel entsprechend der Schnittlinie II-II in Figur 1,
• Fig. 3 eine Seitenansicht der Vorrichtung,
• Fig. 4 eine Draufsicht auf die Vorrichtung,
• Fig. 5 eine Ansicht der Formschulter entsprechend dem Pfeil V in den Figuren 3 und 4 und
• Fig. 6 ein Schnittbild der Vorrichtung entsprechend der Schnittebene VI-VI in Figur 3 zur Darstellung der Trennschweißbacken.

Otherwise, with regard to advantageous embodiments of the invention, reference is made to the claims and the following description, in which the invention is explained with reference to a particularly preferred exemplary embodiment shown in the drawing. It shows

• 1 is a side view of the bag band to be manufactured,
• 2 is a sectional view of the bag according to the section line II-II in Figure 1,
• 3 is a side view of the device,
• 4 is a plan view of the device,
• Fig. 5 is a view of the shape shoulder according to the arrow V in Figures 3 and 4 and
• Fig. 6 is a sectional view of the device according to the section plane VI-VI in Figure 3 to show the separating welding jaws.

The bags 1 shown in Figures 1 and 2 consist of a film, the edges of which are folded over to form a half tube such that a first fold 2 (label fold) and a second larger fold 3 (bag fold) are formed with overlapping edges, whereby the free edge of the bag fold 3 rests on the free edge of the label fold 2 from the outside. For the division of the bags 1 from each other, there are separating weld seams 4, which extend over the entire bag fold 3 and an adjoining partial area of the label fold 2 and each connect the front and back of the folds 2 and 3 of each bag 1, but separate adjacent bags 1 from one another.

The separating weld seams 4 continue into perforations 5 arranged in a line, which facilitates tearing of the area of the label fold 2 connecting the bags 1.

In the label fold 2 of each bag 1 is a label 6 made of cardboard or the like. housed, which is held in place on the one hand by frictional engagement on the separating weld seams 4, which encompass two opposite corners of the labels 6, and by a sealing weld seam 7, which runs right below the label transversely to the separating weld seams 4 and the free edges of the folds 2 and 3 connects to each other and the opposite common side of these folds. If necessary, it is also sufficient if the sealing weld 4 is applied just below the free edge of the label fold and only connects the opposite sides of the bag fold 3 to one another. In any case, the sealing weld 7 closes the bag fold 3 in FIGS. 1 and 2 from above, so that the filling material (not shown) accommodated in the bag fold 3, which is before attachment the seal weld 7 is introduced, is securely enclosed.

The bags 1 are produced from a plastic film 8 which is wound on a roll 9 in the device according to the invention shown in FIGS. 3 and 4. The plastic film 8 first runs over guide rollers 10, of which the roller 10 'is arranged resiliently, so that the roller 9 can be unwound at a constant speed, although the plastic film 8 runs intermittently through the device.

In order to form the half tube with the cross section shown in FIG. 2, the film 8 is pulled over a shaped shoulder arrangement 11. This essentially consists of three pyramid-like guide surfaces 12 to 14. The lateral guide surfaces 13 and 14 are arranged such that their front edges in FIG. 3 leave a gap 15 visible in FIG. 5 between them. In addition, the end piece 14 'of the guide surface 14 is turned over in a U-shape in such a way that its free end in the view in FIG. 5 lies within the gap 15 and, according to FIG. 3, is directed obliquely downwards to the right.

The film 8, coming from the last guide roller 10 ″ in the direction of transport, initially runs over the lower guide surface 12 on which the film 8 lies flat. The two side edges of the film also lie flat on the guide surfaces 13 and 14, the on the side edge lying on the guide surface 14 also lies flat on the left side of the end piece 14 in Figure 5. If the side edges of the film In the manner mentioned on the guide surfaces 13 and 14 or the end piece 14 ', a slack area of the film is formed, which can now be pulled through the gap 15 in Figure 3 to the right such that the film on the one hand around the Gap 15 delimiting front edges of the guide surfaces 13 and 14 and on the other hand around the front edge of the end piece 14 '. In this case, the semi-tube with a cross section according to FIG. 2 is inevitably formed, which is subsequently transported further in the horizontal direction (see FIG. 3) through the device.

For better guidance of the film through the gap 15, a guide bar 16 is arranged which is fastened in front of the shaped shoulder arrangement 11 in the transport direction of the film 8 and projects cantilevered through the gap at the lower end of the gap 5 in the horizontal direction.

Upper and lower pairs of belts 17 and 18 are arranged as a drive for the advance of the film or the half tube, which rotate on guide rollers 19 which are arranged such that the upper pairs of belts 17 between them the label fold 2 and the lower pairs of belts 18 between them Grip the region of the bag fold 3 adjacent to the label fold 2 and allow it to advance to the right in FIGS. 3 and 4 by frictional engagement when the guide rollers 19 are driven.

To insert the labels 6 into the label fold 2 formed by the end piece 14 'of the shaped shoulder arrangement 11, an insertion channel 20 is arranged which, parallel to the guide bar 16, passes through the gap 15 into the vicinity of a light barrier arrangement 22 by a label magazine 21 at the lower end of the end piece 14' . The labels 6 are each driven in the groove 20 by means of a pneumatically driven one Stamp 23 with interrupted advance of the film or the half-tube (guide rollers 19 and thus the belt pairs 17 and 18 stand still) in Figures 3 and 4 to the right until the front edge of the label 6 in the feed direction interrupts the light path of the light barrier arrangement 22. Now the stamp 23 stops or runs back to capture the next label, while the advance of the film 8 or the half-tube switches on and the label 6 located in the take-over position on the light barrier arrangement 22 is carried along by frictional engagement with the label fold. As soon as this label, which has just been taken along, clears the light path of the light barrier arrangement 22 again as it passes by its rear edge, the film advance is interrupted again.

Now another label is again pushed up to the takeover position, i.e. to a position in which the front edge of this label interrupts the light path of the light barrier arrangement 22.

During this interruption of the film advance controlled by the light barrier arrangement 22, a separating welding jaw arrangement 24 is further actuated to produce the separating weld seams 4. In this case (cf. FIG. 6), a separating welding jaw 25 is pressed by means of a pneumatic unit 26 against a fixed counter jaw 27 covered with silicone rubber, until the respective separating weld seams 4 are made and the bag fold 3 has been cut between these seams 4.

At the same time, a pneumatic unit 28 actuates a perforating knife 29, which is pressed against a perforated jaw 30 covered with rubber. The perforations 5 are thus produced in a continuation of the separating weld seams 4.

By controlling the film advance by means of the light barrier arrangement 22, the dimensions of the bags 1 in the forward direction are automatically adapted to the corresponding length of the labels 6.

In the forward direction behind the separating welding jaw arrangement 24, a punching device 31 is arranged, with which the label fold 2 and the label 6 of each bag 1, if any, for forming a hanging opening or the like are arranged. (see FIG. 1) can be perforated.

This punching device 31 is arranged to be displaceable in the forward direction of the film, so that the suspension opening can be attached at a desired point - generally in the middle of the bag. The punching device 31, like the separating welding jaw arrangement 24, is actuated when the film 8 is interrupted, wherein the punching device 31 can again be switched on - indirectly or directly - by the light barrier arrangement 22.

A filling station 32 for filling the bags is arranged between the pairs of belts 17 and 18 in the manner shown in FIGS. 3 and 4. The filling station 32 can, if appropriate together with the pairs of belts 17 and 18, be moved in the forward direction in order to be able to adjust the position of the filling station 32 in such a way that exactly one bag is inside the filling station 32 when the advance is interrupted.

At the filling station 32, a curved guide plate 33 with pressure rollers 34 is arranged such that the label fold 2 runs through between the guide plate and the pressure rollers 34, without the bag fold 3 can be reached from the guide plate 33. The guide plate 33 rests with its convex side on the left side of the label fold 2 in FIG. 2, so that it is accordingly pushed away (in FIG. 2) to the right. The free edge of the bag fold 3 tries to stand out from the free edge of the label fold 2, so that a bag opening 35, shown schematically in FIG. 4, is formed. In addition, an air jet is directed from above against the free edge of the bag fold 3 by means of a blower 36, so that the bag opening is inevitably opened or kept open, since the air jet tries to inflate the bag. The material to be filled can now be filled into the bag by means of a feed or portioning device, not shown.

After passing through the filling station 32, the bags or the bag belt pass through a seal welding device 37, the movable jaws of which are actuated by means of a pneumatic unit 38 for producing the seal weld seam 7 shown in FIGS. 1 and 2.

Now the filled and closed bags only have to be separated from each other. For this purpose, a bag separator 39 with pneumatically operated clamping jaws 40 is used, which are able to hold the bag strand in front of and behind a perforation 5 in such a way that a simultaneously operated separating slide 41 can cut through the perforation 5.

Now the separated and filled bags can be a transport container (not shown) or the like. are fed.

Claims (8)

1.Device for the production and filling of bags (1), which are preferably provided with rigid label strips (6) and are made from a plastic tube (8) half-tube, by the same transverse to its extension - by means of appropriate welding jaws ( 24) - attached separating welding seams (4) into the bags which are initially open on the open side of the half-tube and after filling by sealing welding (7) - by means of corresponding sealing-welding jaws (37) - sealed bags, characterized in that by means of - as part of the device arranged - shaped shoulder arrangement (11) for producing the half-tube both edge strips of a film web (8) which can be pulled over the shaped shoulder arrangement (11), forming two with their free edges lapping U-folds (2,3) can be turned over so that the labels (6) by means of a label feed device (20,23) synchronously with the advance of the half-tube moved along a conveying path through its end opening on the film web side into the one fold (label fold 2) with the Free edge covered on the outside by the other fold (bag fold 3) can be pushed in, and that the separating weld seams (4) which can be attached behind each inserted label (6) by means of the separating welding jaws (25) extend over the entire width of the bag fold (3) to an area of the label fold ( 2) between successive labels (6) - but with the exception of a partial width of the label fold (2) - are extended. 2. Device according to claim 1, characterized in that the separating welding jaws (25) work synchronously with perforating jaws or knives (29, 30) which, in continuation of the separating welding jaws (25) in the region of the part width of the recessed welding jaws (25) Label fold (2) for producing a perforation (5) which continues the separating weld seams (4) in a line-like manner. 3. Device according to one of claims 1 or 2, characterized in that the labels (6) by means of the label feed member (20, 23) can be advanced from a position outside the half-tube into a transfer position (at 22) within the half-tube from which the Labels (6) are taken along by frictional engagement with the label fold (2) when the half tube is advanced. 4. Device according to one of claims 1 to 3, characterized in that a label edge comprising a groove (20) is arranged as a label feed member, in which the labels (6) by means of a groove parallel stamp (23) in the transfer position (at 22) can be pushed forward. 5. Device according to one of claims 1 to 4, characterized in that in the forward direction behind the transfer position (at 22) a light barrier (22) is arranged as part of a control of the cyclical advance of the half-tube, such that the feed when the light path is released the light barrier (22) is interrupted after passing the rear edge of a label (6) in the forward direction by actuating the separating welding jaws (25) to carry out the separating welding seams (4) and then interrupting the light path again through the front edge in the forward direction of the next to the transfer position (at 22) pushed label (6) is switched on again. 6. Device according to one of claims 1 to 5, characterized in that the label fold (2) at a filling station (32) in the forward direction after the separating welding jaws (25) on a curved path with a center of curvature on the free edges of the U-folds ( 2,3) facing side of these folds is such that the web guide elements (guide plate 33, pressure rollers 34) try to press the free edge of the label fold (2) transversely to the direction of advance against the labels (6) without the free due to the web curvature Detect the edge of the label fold (2) lifting free edge of the bag fold (3). 7. The device according to claim 6, characterized in that at the filling station (32) a blower (36) with the label fold (2) leading away blowing direction is directed against the free edge of the bag fold (3). 8. Device according to one of claims 1 to 7, characterized in that a punching device (31) is arranged in the forward direction behind the separating welding jaws (25) with which an opening penetrating the label fold (2) and the respective label (6), e.g. for later hanging of the bag (1), can be produced.

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