DE2547049A1 - TOBACCO POUCH MADE OF PLASTIC FILM AND DEVICE FOR SEALING THESE - Google Patents

Description

is releasably fixed by suction air via suction bores (39, 40).

Applicant; For the applicant;

Focke & Pfuhl Meissner & Bolte

Packaging machines patent attorneys

309 Verden / Aller
Siemensstrasse 10

709818/041 1

MEISSNER & 3OLTE

BREMEN

Applicant:

Focke & Pfuhl packaging autonxaten

3o9 Verden / Aller Siemensstrasse 10

_i

PATENTANWÄLTE DIPL.-ING. HANS MEISSNER DIPL.-ING. ERICH BOLTE

D 28 BREMEN, October 16, 1975 Sievogtstrasse 21 Federal Republic of Germany Telephone 0421-34 2019 Telegrams: PATMEIS BREMEN Telex: 246157 (meibo d)

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Tobacco pouch made of plastic film and device for closing the same

The invention relates to a bag made of thermoplastic plastic film, which forms a pocket with a one-sided (upper) opening with the side edges welded, in particular a wrap-around bag for Picking up tobacco, with a kinked closure streaking in the opening made of tearable material is attached by thermal welding. The invention also relates to a device for closing such a bag.

From DT-PS 1 586 619 a wrap pouch for tobacco is known at in the opening a kinked closure strip made of paper with the help of connecting strips made of plastic by thermal welding is connected to the walls of the diaper bag in the area of the opening. The kinked closure strip is arranged so that the ends the legs point down, namely into the inside of the pocket. In

Models sent in will be destroyed after 2 months if not reclaimed. Oral agreements, especially major < Confirmation -W. Invoiced costs «Ind with invoice date due without deduction. - In the event of late payment, bank interest will be charged.

Jurisdiction and place of performance Bremen. Bremer Bank, Bremen, No. 23100 28 · Die Sparkasse in Bremen, No. 104 5855 · AIIg. Deutsche Credit-Anstalt, Bremen, No. 202 598 ■ Postal checking account: Hamburg 339 S2-202

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of the throat pointing upwards out of the pocket, a tear strip is attached to the inside, the protruding from the side of the bag with one tearing end. To open the diaper bag designed in this way, the Cut the closure strip in the area of the throat with the help of the tear thread, so that the opening for removal of tobacco becomes free.

The invention is based on the object of providing a bag, in particular, wrap-around bags of the aforementioned type to be developed further and improve.

The bag according to the invention is to solve this problem characterized in that the V-shaped closure strip has legs pointing out from the interior of the pocket is attached in the opening.

The bag closure discussed here is preferably designed so that a V-shaped closure strip consists of a Composite film with facing up, namely out of the opening Legs by thermal welding of the thermoplastics arranged on the inside, i.e. towards the inside of the bag Coating is welded to the plastic walls of the bag or the bag, while the outer side of the closure strip made of non-weldable material, in particular paper.

A bag with the aforementioned closure is distinguished by a number of advantages. Composite films are known.

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One embodiment of the fastener strip is a two-layered one Composite film with an inwardly facing layer of plastic, for example polyethylene or polypropylene, and one outer layer of paper. According to another embodiment, the fastener strip consists of only a single layer of material, e.g. Paper. The outward facing surfaces of the V-shaped fastener strip are thereby directly by plasticizing the plastic film of the bag or with the interposition of a Adhesive connected to the bag walls. This design is particularly cost-effective. Due to the aforementioned configuration and the arrangement of this closure strip, its legs can be made directly, for example by thermal welding or gluing be connected to the walls of the bag or the bag. Through the full-surface connection of the Legs with the walls result in cohesive, multilayered Free tabs on the bag that allow you to open it can be grasped between each two fingers and thereby the Enable and facilitate the tear-open process without a special tear-open thread.

Due to the arrangement of the closure strip as a V open at the top, the attachment of the closure strip is also possible made easier by machine. For this purpose, a device designed according to the invention is suitable, which with is equipped with an approximately V-shaped tapering folding sword. This grips the closure strip and leads it under V-shaped Fold in the area between the edge flaps of the pocket. With upright contact pressure and heating of the surfaces to be welded together, the closure strip is fixed in the opening »

To facilitate the tearing process when opening the bag, a pre-embossing can be made in the area of the throat of the closure strip or a partial perforation be attached. The latter is designed so that only the (outer) paper layer =

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is provided with punchings, while the inner plastic layer remains closed all the time.

In the following, exemplary embodiments of the bag according to the invention and a device for closing it are based on the same the drawings explained in more detail. It shows;

1 shows a bag with the features according to the invention in a perspective view,

FIG. 2 is a side view of the upper part of the bag according to FIG. 1,

3 shows a plan view of the bag according to FIGS. 1 and 2 in the area of the opening with the closure strip partially severed,

Fig. 4 shows another embodiment of the invention Bag in a representation corresponding to FIG. 1,

5 shows a vertical section through a bag according to FIG. 1 or on a greatly enlarged scale,

6 shows details of a device for attaching the closure strip in a schematic side view or in longitudinal section.

In the illustrated embodiment of the pouches are so-called wraparound pouches for holding cut tobacco. These bags usually consist of a one-piece, multi-layer blank with outer plastic films. To record

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of the tobacco a pocket (lo) is formed with a front wall (11) and rear wall (12). The front wall (11) and rear wall (12) are thermally welded to one another in the area of a side seam (13) tied together. In the present embodiments, the bags are constructed so that by side gussets, respectively Side walls (14) and a bottom wall are created.

The front wall (11) and rear wall (12) of the pocket (lo) form (upper) edge flaps (15 and 16) which form an opening of the bag or the pocket (lo) limit. With the ones shown here Embodiments is the edge tab (15) of the front wall (11) by a corresponding extension with a Wrap flap (17) is formed which, when the bag is closed, is partially placed around the bag (lo) and releasably fixed will.

The opening between the edge tabs (15 and 16) of the pocket (lo) is hermetically covered by a closure strip (18). This closure strip (18) consists of a material with at least one self-inactive boundary layer In the illustrated embodiment, a composite film (Fig. 5) is provided, namely from an interior, namely the edge tabs (15 and 16) and the inside of the pocket (lo) facing weldable layer (plastic layer 19) and one outer paper layer (2o). Generally speaking, the inner Layer (19) can be thermally welded or activated and the outer layer (2o) is resistant to thermal influences be. The closure strip (18) formed in this way is V-shaped with a clear groove (21). The arrangement is like this taken that legs (22) and (23) of the closure strip (18)

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Point out of the pocket (10), the throat (21) is accordingly arranged pointing downwards or into the pocket (10). The legs (22 and 23) are connected to the edge tabs (15 and 16) practically over their entire surface.

The closure strip (18) extends over the entire width of the bag. In one embodiment with through Side walls (14) formed by side folds result in the area of the edge tabs (15 and 16) and the wrapping flap (17) in each case a lateral overhang (24). This is turned inward in a strip-like manner and thereby forms a thickened edge in the Area of these parts. In the example of FIGS. 1 to 3, the closure strip (18) runs over this thickened edge and closes with the edge tabs (15 and 16).

The preferred embodiment is shown in FIG. Here the protrusion (24) is not folded over, but to the side with the widening of the bag in the area of the edge tabs (15 and 16) and the wrapping flap (17). Here too extends the closure strip (18) without bridging an accumulation of layers up to the edge of the marginal tabs (15 and 16). These are not with one another in the area of the closure strip (18) connected, so that a continuous, the hot one also at the ends, open V-shaped gap is created with freely movable Marginal flaps (15 and 16).

To open the bag, the flaps with the edge flaps (15 and 16)

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a unit forming legs (22 and 23) detected and pulled apart. The closure strip (15) is thereby tear open in the area of the throat (21) and release the contents of the bag (Fig. 3). To facilitate the tearing process, can the closure strip (18) in the area of the throat (21) be provided with markings, for example with a partial perforation, which extends only to a portion of the cross section of the closure strip (18). In which Embodiment of FIG. 5, a perforation (25) is only made in the outer paper layer (20) while the inner plastic layer is closed.

The aforementioned closure strip (18) can be used with particular advantage in a bag or a wrap-around bag which is formed from a multi-layer blank. As can be seen from Fig. 5, is between an inner Plastic film (26) and an outer plastic film (27) including a blank paper (28) or the like. the Legs (22 and 23) of the fastener strip (18) are each connected to the inner plastic film (26) by thermal welding tied together.

The packing formed in the above manner becomes expediently made so that the closure strips (18) is introduced into the opening of the rest of the finished and filled bag. For this purpose, the one shown schematically in FIG. 6 Device particularly suitable.

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The bags are cyclically fed to a closing station by a conveyor with receptacles (29) for one bag each. In their area, the edge tabs (15 and 16) and the wrapping flap (17) are held in a special way, namely approximately V-shaped open.

Now a closure will strip (18) from above in the upwardly angled edge tabs (15 and 16) are inserted opposite the horizontally lying pocket (10). For this purpose, a folding blade (30) that can be moved up and down is provided, the lower, narrow end (31) of which is V-shaped expires.

The closure strips (18) are from a continuous web (32) through a transversely directed separating cut in strips partitioned off. For this purpose, a cutting knife (34) can be moved up and down in the area of a platform (33) for supporting the web (32). The cutting knife (34) is in the area of a recess (35) in the stage (33) through the path (32) while executing the Separating cut moved through.

The closure strip (18) thus divided rests on a part of the stage (33) forming the mouthpiece. Its mouthpiece halves (36 and 37) delimit a slot (38) for the folding sword (30) with the closure strip (18) to pass through. This is releasably held on the mouthpiece halves (36 and 37) by suction air via suction bores (39 and 40). The folding sword (30) takes the initially, exceptionally

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expanded closure strip (18) with. This is pulled off the mouthpiece halves (36 and 37) and lies down thereby V-shaped at the end of the folding sword (30). With this, the pre-folded closure strip (18) is in the Opening between the marginal tabs (15 and 16) introduced.

For welding the legs (22 and 23) of the closure strip (18) with the edge tabs (15 and 16) are arranged below the stage (33) pressure jaws (41 and 42). These are shaped so that they look like a duck's bill filled part of the pocket (10) run out like a cutting edge. In the starting position (Fig. 6}, these pressure jaws (41 and 42) arranged in a slightly conical or V-shaped manner to one another, the ends facing the bag contents close the filled part of the pocket (10), but on the other hand a position of the edge tabs that is open to the folding blade (30) (15 and 16).

The pressure jaws (41 and 42) are pivotable on transversely displaceable Holders (43 and 44) stored. Tension springs (45 and 46) ensure the starting position described above the pressure jaws (41 and 42).

After inserting the folding sword (30) with the closure strip (18) in the area of the edge tabs (15 and 16) are the pressure jaws (41 and 42) by appropriate movement of the Holder (see dashed line) moved together. While pivoting the edge tabs (15 and 16) with the

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intervening closure strips (18) pressed together. At the same time, the required welding temperature is applied. During this pressing process, the folding blade (30) is already withdrawn so that the individual layers are now immediately are pressed together. A connection of the legs (22 and 23) with one another is, however, due to the lack of Activation of the outer layer of the fastener strip (18) prevented. The heating can start from the folding blade (30), which in the present case with corresponding Heating cartridges (47) is equipped.

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Claims (12)

Claims 1.) Bags made of thermoplastic plastic film, the side edges are inter-welded to form a bag with one-sided Forms (upper) opening, in particular a wrap-around bag for holding tobacco, with a kinked one in the opening Closure strip made of tearable material is attached, characterized in that the V-shaped closure strip (18) with legs (22, 23) pointing out from the inside of the pocket (lo) in the opening through the full-surface connection of the Leg (22,23) is attached to the pocket (lo). 2. Bag according to claim 1, characterized in that the outer sides of the legs. (22,23) of the closure strip (18) are connected over the entire surface with the adjacent walls, in particular with edge tabs (15, 16) of the pocket (lo), in particular by thermal welding. 3. Bag according to claim 1 or 2, characterized in that the closure strip (18) consists of a composite film with the walls (edge tabs 15, 16) of the pocket (lo) facing layer made of thermally activatable material, in particular a plastic layer (19) and an outwardly facing layer made of non-weldable material, in particular one Paper layer. 709818/0411 4. Bag according to one of claims 1 to 3, characterized characterized in that the closure strip (18) is formed in the region of a groove (21) between the legs (22, 23) a tear line is pre-stamped or partially perforated in such a way that at least one layer, in particular the outer paper layer (20) perforated, the inner plastic layer (19), however, is continuously closed. 5. Bag according to one of claims 1 to 4, characterized in that the edge tabs (15, 16) of the pocket (10) in the area of the closure strip (18) are not connected to one another and that the closure strip (18) without Connection of the legs (22, 23) with one another is arranged continuously over the entire width of the pocket. 6. Bag according to one of claims 1 to 5, characterized in that in the case of ^one version with side walls (14) formed by gussets in the region of the edge tabs (15, 16) formed strip-shaped protrusions (24) are folded over and strip through the closure (18 ) are covered. 7. Bag according to one of claims 1 to 5, characterized characterized in that in an embodiment with side walls (14,) formed by side folds in the region of the edge tabs (15, 16) protrusions (24) are spread out laterally are, wherein the closure strip (18) extends over the entire length of the edge tabs (15, 16) including the protrusion (24) extends. 709818/0411 8. Device for applying a closure strip in the opening of a pocket of a thermoplastic bag Plastic film, in particular for holding tobacco, characterized in that the closure strip (18) is secured by a folding sword (30) with a V-shaped end can be pre-folded and inserted between the edge tabs (15, 16) of the pocket (10). 9. Apparatus according to claim 8, characterized in that the edge tabs (15, 16) after receiving the closure strip (18), optionally including the folding sword (30), are compressible, in particular by laterally attachable, movable pressure jaws (41, 42). 10. Apparatus according to claim 9, characterized in that the pressure jaws (41, 42) pivotally mounted and bevm between a starting position with V-shaped relative position of the pressure surfaces and a pressing position with substantially collimated pressure surfaces are gbar. 11. Device according to one of claims 8 to 10, characterized in that the preferably of a continuous Web (32) has separated closure strips (18) above a slot (38) for the folding sword (30) to pass through Mouthpiece halves (36, 37) is kept ready in the flat state. 12. The device according to claim 11, characterized in that the closure strip (18) on the mouthpiece halves (36, 37) 709818/0411