EP1048565A1 - Method and device for packaging objects in a film-hood - Google Patents

Abstract

To wrap a package with a film shrouding, especially a stacked pallet, before the film shrouding (6) is released its lower ed is clamped by the gripper frame section (14) at the lower edge of the wrapped stack and/or the pallet, and is moved inwards to give under stretch in relation to the pulled-over shrouding contour.

Description

The invention relates to a method for packaging objects according to the The preamble of claim 1 and a device for packaging objects according to the preamble of claim 6. Such devices and methods are used in particular for packaging stacks of goods arranged on pallets used to protect the stack of goods from moisture and during transport to give other environmental influences. Furthermore, the wrapping of the stack of goods gives with a film hood of the packaging unit increased stability, in particular when the film hood is stretched in the transverse and longitudinal directions when covering and after tensioning it is under tension against the stack of goods.

EP-A-0 633 186 discloses a method and a device for wrapping of general cargo, in which a stretch film is drawn over a stack of goods becomes. To do this, first a film tube of the desired length is closed welded to a film hood and cut off above the weld. The The film hood thus formed is arranged on four rectangularly by means of reefing rollers Gripping devices raised and stretched into a shape slightly larger than that Cross section of the stack of goods to be packed. Then the film hood pulled by a downward movement of the gripping device over the stack of goods and stretched lengthways. In the lower area of the stack of goods an understretch is created using the film hood. This understretch will in that the film by means of the reefing rollers against the gripping devices is pressed and held and in this state opposite the overlay contour is moved inwards, especially under the pallet. Then the gripping devices moved downwards and then outwards so that the film is released and lay under the pallet.

This method has the advantage that the film hood does not immediately after Covering can slip up again. However, the holding force that comes with the reef rolls can only be generated slightly. The holding force of the reef rollers is proportional to the contact pressure on the bracket-like frame section and the Friction coefficient between the film hood and reef roller. Too much pressure can cause damage to the film hood, especially if the Refrolling only an essentially selective force when pressed onto the film exercise. Furthermore, holes in the Foil hood are generated.

DE 90 01 319 U1 describes a further device for packaging objects known to be used in the movable jaws to the film hood to press against the stack of goods in a lower area. This too The procedure prevents the film hood from sliding up, but it can easy to undesirable damage to the film hood or the packaging to lead.

It is therefore the object of the present invention, the disadvantages mentioned above to avoid and a method and apparatus for packaging To create objects with a stretch film hood, with which on a a reliable way to create an understretch with the film hood.

This object is achieved with a method according to the invention with the features of claim 1 and a device with the features of claim 6 solved.

When the film hood is clamped with the bow-like frame sections and an understretch is created with the clamped film hood the need to move the film hood towards the item to be packaged press to prevent the film hood from sliding up. By clamping the film hood with the bow-like frame sections can also the magnitude of the tension of the film hood relative to the production of the substretch can be freely selected and is only due to the material properties of the film hood limited. Finally, the film hood over entire surface sections seized and held, so that selective loads and thus damage the foil hood can be avoided.

According to an embodiment of the method according to the invention bow-like frame sections opened to a film section of the To let the film hood enter the opened area, and then when the bow-like frame sections are closed, this film section is clamped. This procedure enables a particularly fast execution of the method, since when the bow-like frame sections are opened and closed only relatively small movements have to be carried out. Since the stretched Trying to relax the film, it kicks itself into the unfolded bow-like Frame sections and is then when you close the bow-like Frame sections clamped.

Each bow-like frame section preferably moves in relation to one Edge of the object to be packaged, and a film section of the film hood is pinched around this edge. This kind of pinching the Foil hood prevents the tensile forces to generate the Unterstretches only attack punctually, as is the case when a reef roll from the outside onto a Gripping device is pressed to clamp the film hood to the gripping device. If the pinched film section is a certain Extends angle, therefore reduces the load on the film hood.

According to a particularly effective process, the understretch is carried out moving the bow-like frame sections with respect to the overlay contour the film inwards, especially inwards up to the object to be packed generated, with the bow-like frame sections for Open the film hood.

According to a further embodiment of the method according to the invention when pulling off the film hood from the bow-like frame sections the object opened the bow-like frame sections. This has the advantage that the bow-like frame sections when you pull off the film hood generate a certain vertical expansion of the film hood and also pinching the film hood on each bow-like frame section is simplified because this does not have to be opened beforehand.

The device for packaging objects provides in particular that each gripping device has means for engaging one against the gripping device Clamp the film section so that the device for carrying out the method according to the invention is suitable. These funds can be through one or several small clamping devices can be formed.

The bow-like frame sections preferably have a curved shape, each extending around an edge of the object to be packaged, and the means for clamping the film section are adapted, the film section to clamp over a curved area. This avoids a selective loading of the film hood when creating the bottom stretch. In a configuration that is easy to implement, each bow-like frame section has a bracket and a carrier on each other via a folding mechanism are connected. Preferably, the carrier is on its outer Side of the object facing away essentially adapted to the curvature of the bracket, so that the film hood is not torn open at any edges can.

Further developments of the invention are in the remaining subclaims specified.

Fig. 1

eine perspektivische Ansicht der wesentlichen Teile einer Vorrichtung zum Verpacken von Gegenständen gemäß einem Ausführungsbeispiel der vorliegenden Erfindung;

Fig. 2

eine vergrößerte Detailansicht einer Greifeinrichtung beim Überziehen der Folienhaube über den Gegenstand;

Fig. 3

eine vergrößerte Detailansicht einer Greifeinrichtung nach dem Überziehen der Folienhaube;

Fig. 4

eine vergrößerte Detailansicht einer Greifeinrichtung mit aufgeklapptem Bügel;

Fig. 5

eine vergrößerte Detailansicht einer Greifeinrichtung, nachdem die Folienhaube mit dem bügelartigen Rahmenabschnitt festgeklemmt wurde;

Fig. 6

eine vergrößerte Detailansicht einer Greifeinrichtung bei der Erzeugung des Unterstretches;

Fig. 7

eine vergrößerte Detailansicht einer Greifeinrichtung nach dem Öffnen des Bügels;

Fig. 8

eine vergrößerte Detailansicht einer Greifeinrichtung nach der Beendigung des Verpackungsvorganges;

Fig. 9

eine vergrößerte Detailansicht einer Greifeinrichtung beim Überziehen der Folienhaube über den Gegenstand gemäß einer alternativen Verfahrensweise;

Fig. 10

eine vergrößerte Detailansicht des Klappmechanismus in geschlossener Stellung, und

Fig. 11

eine vergrößerte Detailansicht des Klappmechanismus in geöffneter Stellung.

The invention is explained in more detail below on the basis of a preferred exemplary embodiment with reference to the accompanying drawings. Show it:

Fig. 1

a perspective view of the essential parts of an apparatus for packaging objects according to an embodiment of the present invention;

Fig. 2

an enlarged detail view of a gripping device when pulling the film hood over the object;

Fig. 3

an enlarged detail view of a gripping device after covering the film hood;

Fig. 4

an enlarged detail view of a gripping device with opened bracket;

Fig. 5

an enlarged detail view of a gripping device after the film hood has been clamped to the bow-like frame section;

Fig. 6

an enlarged detail view of a gripping device in the production of the Unterstretches;

Fig. 7

an enlarged detail view of a gripping device after opening the bracket;

Fig. 8

an enlarged detail view of a gripping device after the completion of the packaging process;

Fig. 9

an enlarged detail view of a gripping device when pulling the film hood over the object according to an alternative procedure;

Fig. 10

an enlarged detail view of the folding mechanism in the closed position, and

Fig. 11

an enlarged detail view of the folding mechanism in the open position.

The device for packaging objects 1 shown in FIG. 1 has one Supply roll, not shown, for a folded film tube 3, of unwound the supply roll and fed to a central packaging unit becomes. The packaging unit has a frame in which to be packed Objects are transported, and a packaging facility guided on this frame on. From this packaging unit are for better illustration only the components relevant to the invention are shown.

The film tube 3 is turned vertically downward via a deflection rod 4 Welding and cutting device 5 performed. Below the sweat and Cutting device 5, the film tube 3 is opened and moved to four Gripping devices 8 raised by in each case on the outside of the gripping devices 8 a reef roller 10 feeds the film tube 3 to the gripping devices 8. The Foil tube 3 is then welded to a desired length and cut off, so that a film hood 6 is formed by the four gripping devices 8 is stretched into a rectangle.

Each gripping device 8 consists of a bow-like frame section 14, one Folding mechanism 13 and a carrier 15. The carrier 15 is on an arm 11 held along a guide 12 movable in a horizontal direction is. The guide 12 with the arm 11 is also movable in the vertical direction, so that the gripping device 8 are moved both horizontally and vertically can. Furthermore, the bow-like frame section 14 can be by the folding mechanism 13 open inwards.

For the packaging of a stack of goods 1, which is arranged on a pallet 2 the film hood 6 stretched in the horizontal direction, so that the lower opening of the Film hood 6 slightly larger than the cross section of the stack of goods 1 to be packaged is. In this state, the film takes on its "covering contour". Subsequently the film hood 6 thus stretched is moved downward and onto the stack of goods 1 pulled up, with the welded end of the film hood formed the top of the stack of goods 1 and the film from the gripping devices is braked, being stretched in the vertical direction.

As shown in FIGS. 2 to 7, the film hood 6 slides overcoming a frictional resistance from the gripping device 8, so that the film hood 6 experiences a certain stretch in the vertical direction. The braking effect of a Gripping device can also be increased by applying the reefing rollers 10, to achieve a vertical stretch.

As soon as the film hood 6 up to a lower area of the stack of goods 1 or the pallet 2 was opened, the reef roller 10 clamps the film hood 6 against the roller 9. Friction occurs between the film and the braked reef roller 10. The Foil is held on. Then the bow-shaped frame section 14 opened by the folding mechanism 13 inwards and upwards (Fig. 4), so that by a certain relaxation of the film hood 6 a film section under the bow-shaped frame section 14 arrives. The bow-shaped frame section 14 is subsequently closed again, so that the film section between the Top of the carrier 15 and the bow-shaped frame section 14 is jammed. After clamping the film hood between the bow-shaped Frame sections 14 and the beams 15 are the reef rollers 10 after driven outside. With the clamped film hood 6, the gripping devices downwards and in relation to the outer contour of the film in particular moved under the pallet 2 or the stack of goods 1 to an understretch to create. It is also possible to place the gripping devices 8 in the lateral recesses to move the pallet 2 so that openings of the pallet 2 for others Purposes remain open.

After the creation of the substretches, the bow-like frame sections 14 opened again, and the previously clamped film sections are released so that they are at the bottom of the pallet 1 or the stack of goods 2 can create. The gripping devices 8 are down and then moved outwards to get to the next film hood.

As shown in Fig. 9, when pulling the film hood 6 over the stack of goods 1 of the bow-shaped frame sections 14 of the gripping device 8 also already be in the open position. On the one hand, this enables greater stretching the film hood 6 when removing from the gripping device 8 and on the other the bow-shaped frame section 14 needs to clamp the film hood 6 only to be closed in the lower position.

10 and 11 show the frame section which can be folded through the bow 14 formed mechanism in detail.

Claims (12)

Method for packaging objects, in particular a palletized stack of goods (2) with a tubular or hood-shaped stretch film, which is pulled up onto a plurality of gripping devices (8) with bow-like frame sections (14) and frame supports of a lifting frame which can be moved in the vertical direction and is stretched in this way by means of the gripping devices is that the open opening of the film hood (6) is larger than the plan of the object to be packaged, and wherein the film hood (6) with a certain stretch across the plane of the open opening of the film hood over the object and before releasing their lower edge section in the area of the lower stack of goods or / and the pallet is at least temporarily pressed laterally against an abutment, characterized in that the film hood (6) before releasing its lower edge section in the area of the lower section of the stack of goods or / and the pallet with the ironing term frame sections (14) is clamped and moved to the inside to produce a lower stretch relative to its overlay contour. Method according to Claim 1, characterized in that the understretch is produced by moving the bow-like frame sections (14) under the object to be packaged and / or the pallet (2) and subsequently the bow-like frame sections (14) for releasing the film hood (6) be opened. Method according to claim 1 or 2, characterized in that the bow-like frame sections (14) are opened, one film section of the film hood (6) moves into the opened area and this film section is clamped when the bow-like frame sections (14) are closed. Method according to one of the preceding claims, characterized in that each bow-like frame section (14) is moved relative to an edge of the article to be packaged and a film section is clamped in each case around this edge. Method according to one of the preceding claims, characterized in that when the film hood (6) is pulled off the bow-like frame sections (14) via the object, the bow-like frame sections (14) are opened. Device for packaging objects, in particular a palletized stack of goods (2) with a tubular or hood-shaped stretch film and a plurality of bow-like frame sections with bow supports arranged on a lifting frame and having rounded film contact surfaces and having gripping devices (8, 9, 10, 11, 12) for contacting and stretching the film hood (6), the gripping devices with the lifting frame being movable in the vertical direction along the object to be packed, characterized in that each gripping device (8) has means (13, 14) has in order to clamp a film section (6) lying against the gripping device (8). Apparatus according to claim 6, characterized in that each gripping device (8) has a curved shape and extends in each case around an edge of the article (1) to be packaged and the means for clamping the film section are adapted, the film section (6) over a curved one Area to clamp. Apparatus according to claim 6 or 7, characterized in that each gripping device (8) has a bracket-like frame section (14) and a bracket support (15) which are connected to one another via a folding mechanism (13). Device according to claim 8, characterized in that each bow-like frame section (14) has a curved shape with a curvature of at least 90 °. Apparatus according to claim 8 or 9, characterized in that the bow support (15) on its outer side facing away from the object (1) is essentially adapted to the curvature of the bow-shaped frame section (14). Device according to one of claims 6 to 10, characterized in that the bow-shaped frame section (14) can be opened inwards via the folding mechanism (13) and the film section can be clamped under the bow-shaped frame section (14). Device according to one of claims 6 to 11, characterized in that the underside of the bow-shaped frame section (14) and the top of the bow support (15) are provided with an adhesive surface.

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