DE102008005157A1 - Method and device for producing stand-up pouches - Google Patents

Abstract

A method and a device for producing a self-supporting bag (1) as bag packaging from a film tube (3) are proposed in which at least in the region of the bottom (4) of the self-supporting bag (1) to be produced a folding and sealing of parts of the film tube (2 ) is carried out to produce a substantially flat bottom (4). Inner parts of the bottom (4) are pressed flat inwards with a forming pressure stamp (5), so that I give a fold in the edge region of the film tube (2), which forms a circumferential web (7).

Description

State of the art

The The invention relates to a method and an apparatus for the production of stand-up pouches as pouches, starting from the generic features of the method claim 1 and the device claim 4.

ever after embodiment of a bag this is as a stand-up pouch or block bottom bag. Indicative of one such stand-up pouches is that these pouches have a bottom, the flat in the open state of the bag rests on the floor, so that the bag either independently is stabilized or at least stabilized by the soil in the way and that the bag is easy to fill and after filling usually has sufficient stability. Parts of the front wall and back wall of the bag are folded inwards and with each other connected so that these areas form the sides of the bag and as folding in the folded state between the front wall and Rear wall are arranged. Such bags will too Called gusseted bag.

For example, in the German utility model DE 88 12 261 U Such a stand-up pouch is described. The stand-up bag described here is formed from a front wall and a rear wall, which are welded at their longitudinal sides by means of side welds. In addition, this bag has a folded bottom, which is reinforced by means of a glued Aufstellstreifens. The footprint strip on the bottom of the pouch allows the pouch to be given sufficient rigidity to allow it to be set up and to keep the unfolded pouch in an unfolded position. The Aufstellstreifen is here glued on the inside or outside. The disadvantage here is that such bags must be provided with separate Aufstellstreifen to obtain a stiff stand-up pouch.

Today, stand-up pouches are manufactured on packaging machines according to the known tubular bag principle. In this case, a packaging material web is conveyed via a hollow forming tube and formed into a tube. In the conveying direction of the tube, the cross section of the forming tube continuously changes from a circular cross section into a rectangular cross section at the outlet end, on the underside of which the tube end section is folded by means of a folding device to form a folded standing or block bottom with gussets drawn in in V shape. When the packaging material is pulled over the forming tube, a longitudinal seam and a horizontal sealing seam are produced in the top and bottom regions of the pack. The bags are then cut off with a knife between the sealing jaws for the top and bottom sealing. Such a method is for example from the German utility model DE 9414 726 U1 known.

to Production of stand-up pouches become common Floor folding tools used by mechanical folding of the Bag corners to produce a flat bottom. The disadvantage is at This known method that is doing, especially for small Cross sections, often give poor footing properties, and the pack to fall over the bag handling and on the shelves inclines.

Disclosure of the invention

The The invention relates to a method for producing a stand-up pouch as a bag packaging from a film tube, in which at least in the area of the bottom of the self-standing bag to be produced Folding and sealing of parts of the film tube for the production of a largely flat soil is carried out. To bag packaging and in particular to produce stand-up pouches which are also suitable for small ones Cross-sections have very good performance characteristics are inventively in Advantageously, inner parts of the soil flat after pressed inside, so I have a fold in the edge area of the film tube results, which forms a circumferential web.

Advantageous In this case, it is especially when the folding and the pressing of the soil by applying heat to the to be folded Area of the film tube made or at least supported becomes. Depending on the type of packaging, however, can be on the admission with Heat can also be dispensed with.

at an advantageous embodiment of the invention Method, the film tube is made from a packaging material web, wherein the packaging material web is formed around a forming tube to the film tube becomes. It will be a longitudinal seam as well as on the head and / or bottom of the stand-up pouch creates a horizontal sealed seam and the Stand-up bag is then above the head-side Sealed seam and separated below the bottom seal, so after disconnecting the orbiting web at least on the ground can be formed.

Furthermore, an apparatus according to the invention for carrying out the method described above is proposed, in which a forming tube for receiving the film tube and a molding pressure stamp is present, the outer geometric dimensions are smaller than the inner geometric dimensions of the forming tube. Furthermore, a device for moving the mold pressure stamp in the interior of the mold tube is present, wherein the inner parts of the soil previously formed by the folding and sealing surface are inwardly printable, so that thereby an additional folding in the edge region of the film tube of the circumferential ridge forms.

According to developments the device according to the invention can be inside the mold tube a fixed or movable counter punch arranged its and the mold pressure stamp can be on an adjustment unit or a format part are arranged as means for moving. Furthermore, the mold pressure stamp and / or the Counterstamp be provided with a heater.

The Device can be operated in vertical or horizontal position and for stand up pouches with round, angular or be applied to any cross-sectional geometry.

By the inventive method or with the proposed Device can be a stand-up bag with optimized stability and higher stability even during transport primary packaging, in secondary and earth packaging as well as on the shelf. A grip-stable pack and new pack appearance can be without additional materials obtained inexpensively with unchanged packaging materials become.

It There are no additional packaging costs and costs no additional packaging waste. This is next to the Cost aspect also an advantage in terms of recyclability the packaging. Except for the investment for the additional function with Forming punch is thus the produced packaging largely cost-neutral.

Brief description of the drawings

One Embodiment of the invention Method is based on a device according to the figures of the drawing explained. Show it:

1 a schematic view of a stand-up pouch according to the invention as a bag packaging in a first step of a manufacturing process and

2 a schematic view of the bag packages according to the invention in a second step of the manufacturing process.

Way to execution the invention

Out 1 is a device for producing a bag packaging, in particular of so-called stand-up pouches 1 in which a packaging material is processed as a roll product and a forming tube 2 to a film tube 3 is formed. On the form tube 2 are a per se known and not shown here and explained in more detail band advantage and an arrangement for a longitudinal seam seal attached. In this way, all types of longitudinal seam seals as well as two-, three-, four- or multi-edge seals can be produced. The device can be constructed vertically or horizontally.

Furthermore, a floor 4 of the film tube 3 produced according to a known and not shown here and explained in more detail folding and bottom seam sealing. In a size separation step with corresponding bottom folding tools known from the prior art, the film tube becomes 3 here folded inwards and thus to produce a flat bottom 4 transferred.

According to the invention, in addition to the known device and the previously described functional sequence in the production of the bag packaging 1 as a stand-up pouch a form pressure stamp 5 present, in the hitherto processed film tube 3 for producing the pouch packaging according to the invention 1 is movable into it.

The 1 shows the mold pressure stamp according to the invention 5 before entering the device and off 2 can be seen how the compression punch 5 a predetermined range 6 in the form tube 2 retracted. The form pressure stamp 5 is designed as a format part or as an adjustment and introduced into the bag. The format part is matched in its dimensions to the forming tube and the adjustment is variable in these dimensions.

The outer diameter of the mold pressure stamp 5 is smaller than the inner diameter of the forming tube 2 in such a way that a simple insertion of the mold pressure stamp 5 in the form tube 2 also taking into account the then intermediate film tube 3 is possible. By dipping the mold pressure stamp 5 in the form tube 2 becomes the ground 4 of the film tube 3 pressed so far inward that by folding in the film tube 3 in the form tube 2 under the pressure of the mold pressure stamp 5 around the end of the mold tube 2 a circumferential jetty 7 of the film tube 3 out forms.

The height of the bridge 7 should be so be measure that stand-up pouch 1 after completion of the production exclusively on the webs 7 comes to stand and thereby, the stability of the stand-up pouch 1 affect unevenness of the soil 5 can not have negative effects.

According to a further embodiment of the invention, the mold pressure stamp 5 be designed so that it is heatable. Especially with thermoplastic material of the film tube 3 can thus provide a faster, more accurate and more permanent expression of the webs 7 be achieved.

Furthermore, it is possible according to a development of the described embodiment, not shown here, that in the interior of the forming tube 2 a movable or fixed counter-punch (heated or not heated) is introduced, so that a further improvement in the formation of the soil 4 and a stopper upon insertion of the forming die 5 is available.

The form tube 2 and corresponding to the forming pressure stamp 5 can with regard to the required geometry of the stand-up pouch 1 have a corresponding shape, z. B. round, rectangular, polygonal etc.

After the mold pressure stamp 5 again from the mold tube 2 is pulled out, the stand-up bag thus produced 1 cut at its upper end by means of a separating device, not shown here, and the manufacturing cycle can with the introduction of a new film tube 2 start over.

However, it is also possible, according to alternative embodiments, a conventionally produced and already cut pouch packaging in a subsequent process step with the forming pressure stamp according to the invention 5 and to edit, with only a holder for the processed bag packaging must be present. The bag packaging can either be empty or filled.

If the pouch packaging has not yet been filled, the pouch packaging can be received in a transport chain (not shown here) and, for example, a counterpressure ram can be retracted from above. In a filled bag packaging this can be closed in the transport chain and then the mold pressure stamp 5 be guided from above on the filled and closed pouch packaging.

The method according to the invention can thus be carried out additionally or alone also in the head region of the pouch packaging, optionally with further mold pressure punches 5 and countermarks.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 8812261 U [0003]
• - DE 9414726 U1 [0004]

Claims (12)

Method for producing a stand-up pouch ( 1 ) as bag packaging from a film tube ( 3 ), at least in the area of the soil ( 4 ) of the stand-up pouch to be produced ( 1 ) a folding and sealing of parts of the film tube ( 2 ) for producing a substantially flat soil ( 4 ), characterized in that inner parts of the soil ( 4 ) are pushed inwards, so that I have a fold in the edge region of the film tube ( 2 ) resulting in a circumferential web ( 7 ). Method according to claim 1, characterized in that the folding and pressing of the ground ( 4 ) by applying heat to the area of the film tube to be folded ( 2 ) or at least supported. A method according to claim 1 or 2, characterized in that the film tube ( 2 ) is produced from a packaging material web, wherein the packaging material web around a forming tube ( 3 ) to the film tube ( 2 ) is formed, that a longitudinal seam and at the head and / or bottom ( 4 ) of the stand-up pouch ( 1 ) a horizontal sealing seam is produced and the stand-up pouch ( 1 ) is then separated above the top seal and below the bottom seal and that after the separation of the circumferential web ( 7 ) at least on the ground ( 4 ) is formed. Device for carrying out a method according to one of the preceding claims, characterized in that a forming tube ( 2 ) for receiving the film tube ( 3 ) exists that a forming pressure stamp ( 5 ) is present whose outer geometric dimensions smaller than the inner geometric dimensions of the forming tube ( 2 ) and that means for displacing the mold pressure stamp ( 5 ) in the interior of the forming tube ( 2 ), the inner parts of the soil ( 4 ) inwardly printable, so that the folding in the edge region of the film tube ( 2 ) and the circumferential bridge ( 7 ). Apparatus according to claim 4, characterized in that in the interior of the forming tube ( 2 ) a solid countermark is arranged. Apparatus according to claim 4, characterized in that in the interior of the forming tube ( 2 ) is arranged a movable countermark. Device according to one of claims 4 to 6, characterized in that the forming pressure stamp ( 5 ) is designed as an adjustment or as a format part. Device according to one of claims 4 to 7, characterized in that the forming pressure stamp ( 5 ) and / or the counter punch are provided with a heating device. Device according to one of claims 4 to 8, characterized in that the device in vertical or horizontal positioning is operable. Device according to one of claims 4 to 9, characterized in that the device has a transport path, in the case of empty or filled stand-up pouches ( 1 ) with at least one mold pressure stamp ( 5 ) the fold is developable. Device according to one of claims 4 to 10, characterized in that the forming tube ( 2 ) is designed as a mandrel, preferably as part of a mandrel wheel machine. Application of a method or a device according to one of the preceding claims, characterized in that stand-up pouches ( 1 ) can be produced with round, square or any cross-sectional geometry.