DE9012589U1 - Device with a film wrapper for wrapping packages in film - Google Patents

Description

Device with a film wrapper for wrapping. packaging units i»; ioli-,

^- The invention relates to a device for wrapping

of packages or containers in a shrink film, over which the film is pulled off from a supply roll under tension, according to the preamble of claim 1.

Such a device is known from DE-OS 31 06

known. With such a device, in particular, multi-part packaging goods, which are stacked on a pallet, for example, are combined to form a packaging unit __, whereby the material of the film web any stretchable plastic material can be used since the production of packaging by wrapping with a film strip basically does not require additional tying or sealing.

- _&Lgr; Plastic stretch film webs are used, for example,

Films made of polyamide, polypropylene, PVC, polybutylene, polyethylene or co-polymers or mixtures of the above materials are suitable. Such films are freely available in stores. The elasticity of the stretched plastic film keeps the parts of the packaging goods under tension.

JMK.

In the known device, the packaged goods

carried on a turntable and continuously rotated with the turntable during winding. The disadvantage here is that the goods to be unwound cannot be adequately connected to a pallet underneath.

The task is therefore to design the device in such a way that construct that in particular so-called :alettized

Can be wrapped well, whereby the pallet in particular must also be wrapped.

Consider a packaging unit consisting of a

jg pallet consists of the majority of packaging, such as light, filled boxes. These parts can be used as a "packaging unit" to form a packaged good in which, as is well known, a shrink-wrap film is wrapped around the good and the pallet.

2Q The film is wrapped around the cuboid container. Preferably, one winding is made in both directions, which differ from the first by 90°. After wrapping, such a container has approximately the shape of Figure 3 .

_, the disadvantage is that the holes for the fork

forklift or pallet lifting device, which are located below the pallet floor in the space between the skids and the pallet floor, are also covered by wrapped film. The tines of the forklift have to pierce this film to lift the pallet, which can lead to the film becoming loose and being destroyed. The latter does have a very high tensile strength. However, once the film has been torn, shear cracks occur which spread and have a very negative impact on the strength of the entire packaging.

It is therefore necessary in some cases to attach additional adhesive strips, ties or similar to prevent tearing over

progresses beyond the Eirietich holes.

The device is therefore intended in particular to produce wrapped packaging goods which, as a whole, are kiss-proof. can better withstand stresses, with particular emphasis on the transport of palletised goods.

This task is solved with a device of the type mentioned at the beginning by using a tile for wrapping

comprises a film guiding device guided on a closed guide track, and that the film guiding device carries a stretching roller device and the film gatherer.

According to the invention it is possible to produce containers

wrap, the final state of which corresponds to that of Figure 4 and Figure 5. The film web, which is wide in itself, is tied or tied together during the guiding to the package, i.e. between the film guiding device and the package. gathers so that a very tightly held strand is created. This strand can then be guided over the parts of the pallet that do not come into contact with the tines or guide rails of the pallet transport devices or that are in the way. Nevertheless, the packages on the pallet are sufficiently held in place by the tensioned films. Another advantage is that when the package is removed, relatively simple cuts can be made through the strand area and the film material can then be pulled off the old container.

The device can also be used to create packages with other winding configurations. For example

can initially wrap the package with it 35

overlapping film strips. Then The package is returned again and additionally wrapped with a tied rope, which ensures the

It is also possible to tie the entire package with only one gathered strand, as shown in Figure 5 , so that the entire package is not so much wrapped up as is constricted.

Usually, the known winding devices for circular-shaped fabrics, as are known from numerous examples, have so-called stretch roller arrangements. Preferably, the attachment and gathering takes place after passing through the stretch rollers mentioned.

Embodiments of the invention and the winding process are described using a drawing. The fi The drawings show in detail:

Figure 1 shows a schematic representation of a winding device seen in perspective;

Figure 2 a detail of Figure 1 with a different

Figures 3-5 show different possibilities when using the _above -mentioned device according to the invention.

Figures 1 and 2 show a packaging device 1 which has a ring 2 at its entrance, to which a film guide device 3 is attached in a rotating manner. The film guide device 3 is connected to a supply roll 4 which is arranged in a rotating manner with a core 5 on the ring 2, without details being shown here. A film web 6 is pulled off the supply roll 4 and is fed via a stretching roller device

7, which contains two streak rollers 8.8', the 35

via a common gearbox into a fixed rotation ratio, whereby usually the gear ratio

set up so that the film web drives the discharge-side roller 8 at a higher speed than the feed-side roller 8', whereby the film web is stretched in the area between the two stretching rollers 8 and 8'. The stretched film web 6' then reaches a film gatherer 10, which forms an essential core of the invention. The projecting parts 4 to 9 are all guided circumferentially with the film guide 3 in the ring 2 as a guide track.

The film gatherer takes the wide film web 6* and ties and gathers it together so that a tight strand 6 ¹ ' is created from the stretched film material. Since the elastic modulus and the achievable strength of the film increases considerably above the yield point for most stretch films, a strand with very high tensile strength and tear resistance is created.

2Q The film gatherer 10 is preferably equipped with a gathering head that can be moved transversely to the film plane and that gathers the film from the edge to its center, whereby in the embodiment shown the gathering heads are designed as two gathering rollers 14, 15.

Figures 1 and 2 show different positions of the film gatherer 10. The two gathering rollers 14 and 15 are arranged on two sliding rods 19, 19*, which extend transversely to the plane of the film. Two trolleys 21, 21* are arranged on the sliding rods 19, 19' so that they can be moved via sleeve guides, whereby one trolley 21 can move from the top - outside to the middle, the other from the bottom - outside to the middle, as the figures show.

1 and 2. The trolleys 21 , 21' are each 35

because it is guided on both sliding rods 19, 19* and provided with overlapping cuts so that they can pass each other. On each of the two trolleys 19,

19' is arranged one of the two gathering rollers 14 and 15, respectively, which rotate on axle stumps without their own drive.

The two trolleys 21, 21' are linked by a Kolberi cylinder arrangement (not shown) located in the housing and are connected to the control system üST KOx«JSri~

jQ Cylinder arrangement can be controlled electrically via

a connection (not shown). Instead of the sliding rods, a rack or a spindle with a spindle slide can also be provided as a drive. It is important that the two gathering rollers 14, 15 can be moved in and out of the film guide device 3 at a certain angular position. When the two gathering rollers 14, 15 are moved, they reach the position shown in Figure 1, so that the gathered film 6' is tied together to form a strip 6' after passing through the two gathering rollers ^Λ , 15. Since the film is generally self-adhesive, the strand ⁶ ' that is now created is compressed to a relatively tight length and can be used in a similar way to a cord. For example, it is possible for packages with two parallel bases to be wrapped over the base with a full width of film and for the tightening from the full width to S*i < j to be created over the distance between the two entire surfaces, as is the case in Figure 4. The gathered strand therefore comes together in the area of the pallet 24 below the pallet base 25 where the tines of a forklift truck can no longer come into contact with the film, that is, at ci^n tine holes 26 of the pallet 24 with the container 23 lying on top. By appropriately controlled engagement and disengagement of the two gathering rollers, a film lying over the full width can easily be produced in the upper area of the container 23, which is gathered downwards.

It is also possible to wrap the packages only with a shirred film, as shown in Figure 5, where the strands 6'' are provided as the only wrapping means.

Although the stretch film normally adheres very well to one another, the _strands can also be clipped, glued or welded to the underlying material or to crossing or adjacent hard strands.

become.

It is also possible to use the device as known from EP-OS 14 03 01. In this case, one film is not gathered, while the film coming from the other roll is gathered. Different tensions can also be generated by controlling the stretching rollers accordingly, which can also be used for improved packaging.

As can be seen, the end division of the gathering rollers 14,

15 can also be fixed in such a way that the diameters of the two gathering rollers 14, 15 overlap in the film running direction or - a fl-configuration of the combined

__ men-laced strand 6' producing - offset zuelnan-Zo

which can be arranged.

It is also not excluded that the gathering device only needs a single gathering roller, which

means that only one side is being tied together 30

This is done against a stop on the other side side. In terms of symmetry and the stress on the material, however, it is better to work with two opposing gathering heads that meet in the middle. Instead of using translationally moving gathering heads, it is also possible to work with pivoting rods on which gathering heads &bgr; are located, as is known from the state of the art.

List of reference symbols. 1 Packaging device

0

3 Film guiding device

4 supply roll

5 core

6 film, 6' stretched film web, 6 ^tf ^q 7 stretching device

8, 8' stretching rollers

10 foil packers

11 -

12 - ^

¹³ - -

14 Raffroll

15 ruffle roll

16 Housing

17 Dachshund Line 2Q 18 Conveyor

19, 19' Slide bar 20 -

21, 21' Trolleys 22 Piston-cylinder arrangement 23 Containers

24 pallets

25 pallet floor

26 prong hole

Claims (1)

· Protective area 1. Device for wrapping packages in a shrink film, in which the Foil® is Tensile stress is drawn from a supply roll and wrapped around the packaging, and between the supply roll and the film is arranged a tying film gatherer, with &Phi; the film before creating a -packaging unit» -*d ©ins» -u^ o«»«<tfinü- strand is gathered, thereby yek ■?»»;; characterized in that at least on one "Il of the circumnavigation and/or at least part of the circumnavigations the film (6, 6', 6") is gathered into a tight strand (6 ^sts ). 2. Device according to claim 1, characterized in that the film gatherer (10) is provided with two transversely displaceable to the film plane and the film from its edge _, grasping and pushing together to their center gathering heads (gathering rollers 14, 15). 3. Device according to claim 2, characterized in that the gathering heads (2) are two gathering rollers (14, 15) with their axes of rotation perpendicular to the plane of the film. 4. Device according to claim 2 or 3, characterized in that the gathering heads or gathering rollers (14, 15) are arranged on trolleys (21, 21') which can be moved on sliding rods (19, 19') or racks extending transversely to the plane of the film. 5. Device according to Aneoruch 2 or 3, characterized in that the gathering heads or gathering rollers (14, 15) are arranged on two slatted supports, which are 9. which are driven by rotary spindles running transversely to the film plane. &mdash; O _ 6- Device according to claim A, characterized in that the displacement of the trolleys (19, 19') takes place by means of a piston-cylinder arrangement. i. Device according to claims 1 to 6, characterized in that in their narrow end position the diameters of the two taff rolls (14, 25) overlap one another in the film running direction or ig - an S-configuration of the co-occurring strand generating total (6*') - are arranged offset from each other .