EP2719627A1 - Method and device for wrapping a stack of goods with a film - Google Patents

Abstract

The method involves drawing a portion of film from a film supply, cutting off a film, opening a film by a film opening unit and pulling the film over the stack of goods by a travelling pulling unit. The portion of film is transported lengthwise by a film transport unit (20) to the film opening unit after the film is drawn off and cut. The portion of film is transported from the cutting unit till the film opening unit is gripped by frictional engagement between two conveyor portions that are pressed together and circulated endlessly in transport direction. An independent claim is included for a device for wrapping stack of goods in film.

Description

The invention relates to a method and a device for wrapping a stack of goods with a film, wherein a film portion withdrawn from a film supply with a film removal device, separated by a cutting device, optionally welded to a film hood, opened by a film opening device and a movable Überzieheinrichtung on the stack is pulled, according to the preamble of claim 1 and claim 7.

Such methods and devices are known from the prior art in many ways, for example from the DE 39 18 311 A1 , In such conventionally constructed packaging devices, the device elements that are required for peeling, cutting and possibly welding the film are arranged inside or on a hoist frame in the form of a so-called hood head fixed above a coating device. These parts must be serviced at regular intervals and, if necessary, repaired unpredictably. To carry out this work, a working platform on the side next to the hoist frame is necessary.

In the EP 2 069 206 B1 It has been proposed to arrange said device elements ("hood head") vertically movable and lower for maintenance and repair purposes. However, this requires a complicated traversing and locking mechanism and additionally brings with it the disadvantage that the device elements can not be lowered when there is a stack of goods inside the device.

From the DE 600 24 523 T2 It is known to roll up a separated film section on a storage drum and to position it with a robot arm on the stack, where the film is unrolled again. Such discontinuous operation is unfavorable at fast timing of the packaging operations.

From the DE 85 33 302 U1 a device for covering a shrinkable casing on packaged is known, in which on a frame a vertically movable transport carriage is provided which can take a front casing end, pulls the casing upwards and then moves to take over a next casing down. DE 38 22 241 C1 discloses a similar device in which reciprocating grippers are provided to move the sleeve up and over the packaged goods, the grippers then being moved back against their original transport direction. In both cases, the discontinuous operation is disadvantageous.

The invention has for its object to solve the aforementioned problems.

For this purpose, a method for wrapping a stack of goods with a film according to claim 1 is first proposed.

Thus, unlike most conventional wrapping methods, at least the peeling and severing of the film section from the film supply does not take place in a hood top above a stall exit height, i. H. above the stack of goods, but below the Überziehegangshöhe, whereupon the separated film section is transported by a specially provided film transport device lengthwise to the required Überziehegangshöhe or above, to a film opening device so that they grab the film section and open and can pass to the overdrawing device who then pulls him over the pile.

Due to the continuous operation in contrast to the prior art and in conjunction with a lower height, in which the stripping and separating takes place Time savings achieved, and it is a maintenance or repair operation much easier possible.

Conveniently, the invention provides that a lower edge of the film is drawn by pulling the Überzieheinrichtung from a Überziegehgangshöhe to a Überziehendhöhe, the film section is subtracted and separated below the Überziehegangshöhe of the film supply and transported by the film transport device at least up to the Überziehegangshöhe.

It is preferably provided that the film section is welded below the Überziehausgangshöhe to a closed film hood on one side. Due to the fact that the welding process also takes place in a lower height compared to the prior art, a possibly necessary maintenance or repair intervention can also be made much easier here.

Appropriately, it is provided that the film section within a film preparation range, which extends from below the Überziehendhöhe to at most 50% or 75% of Überzieehgangshöhe removed and / or separated and / or welded. Since it is advantageous if an operator or maintenance person can easily reach the device elements required for carrying out the stripping, cutting and welding operations, it is expedient if these are located in the area of a hall level, so that it is particularly advantageous. if the foil section is pulled off and / or separated and / or welded at a height of at most 1 m, 1.5 m or 2 m above a hall level, on which a wrapping device, with which the method is carried out, is removed.

Of course, the said elements can also be below the stall height or below the hall level, for example, sunk in a designated easily accessible pit, which may be accessible or covered by hall vehicles passable to save space. It can also be provided that the foil section is pulled off in the region of a first floor of a multi-storey installation, separated and the Folientransporteinrichtung is supplied, wherein the stack to be wrapped and the Folienöffnungs- and Überzieheinrichtungen are in the range of one above or below the first floor located second floor.

Conveniently, the film portion is conveyed in the vertical direction up to or above the Überziehegangshöhe, and then in the horizontal direction to over the overdrawing device.

Preferably, the film portion is formed of stretch film and is stretched transversely prior to coating, for example, at least 15%, 20%, 30%, 50% or 75% of its initial dimension in the unstretched state.

Furthermore, there is the possibility that a predetermined length of film and / or a plurality of separated film sections are temporarily stored by the film transport device before they are opened and fed to the overdrawing device. In this case, the film transport device may have a greater length than is necessary for the pure transport between the stripping, separating and optionally welding and the opening of the film.

The invention further relates to a device for wrapping an article with a film, in particular for carrying out the method according to the invention, according to claim 7.

Appropriately, it is provided that the film transport device extends from below the stall height to at least in the Überziehegangshöhe.

Preferably, a welding device for forming a film hood closed on one side is arranged below the covering heel height.

The film removal device and / or the cutting device and / or the welder may be disposed within a film preparation area ranging from below the stall height to at most 50% or 75% of the stall pass height.

It is preferably provided that the film removal device and / or the cutting device and / or the welding device at a height of at most 1 m, 1.5 m or 2 m above a hall level on which the device is located, or optionally below the Hall level, as explained above.

There is the possibility that the film supply, the film removal device and optionally the cutting device in the area of a first floor of a multi-storey plant and the stack to be wrapped and the Folienöffnungs- and Überzieheinrichtungen located in the range above or below the first floor located second floor.

The first conveying element may comprise two or more first part conveying elements, and the second conveying element may comprise two or more second part conveying elements.

The film transport device may have an inlet region, a vertical conveying region, which extends into or above the coating transition height, and an adjoining, in particular horizontal transfer region, which extends beyond the coating device. The vertical conveyor section may be located inside or outside a hoist frame of the apparatus, wherein the hoist frame may comprise two or four vertical supports on which the overdrawing device is vertically guided.

The horizontal transfer region may comprise a vertically downward delivery region at the end.

The film transport device is preferably provided with two endlessly guided conveying elements in the form of straps, belts, toothed belts, flat belts, round belts, chains, link belts or the like. Alternatively, the film transport device may be formed in sections from two endlessly guided, pressed against each other conveying elements, for example, with a first pair of conveying elements for a vertical conveying area and a second pair of conveying elements for a horizontal transfer area.

The film transport device can be set up for transporting the film section up to a film delivery height that is above the topcoat height by a handling amount, wherein the handling amount can correspond to at least one height of a film opening device.

In one variant, the film transport device can be designed as a film store or as an additional film store in which a predetermined length of film and / or a plurality of separated film sections can be stored. For this purpose, the film transport device may be guided in detours, for example in a plurality of mutually parallel, opposing sections in order to achieve a predetermined overall length.

By temporarily storing film and / or film sections, time savings can be achieved in successive packaging operations.

Fig. 1

eine perspektivische Ansicht einer erfindungsgemäßen Vorrichtung zeigt,

Fig. 2

eine schematische Seitenansicht der Vorrichtung nach Fig. 1 zeigt,

Fig. 3

einen vergrößerten Ausschnitt aus Fig. 1 zeigt, und

Fig. 4

eine Ausführungsvariante mit zwei Teilförderelementen zeigt.

The invention will be explained with reference to an embodiment, reference being made to a drawing in which

Fig. 1

shows a perspective view of a device according to the invention,

Fig. 2

a schematic side view of the device according to Fig. 1 shows,

Fig. 3

an enlarged section Fig. 1 shows, and

Fig. 4

shows a variant with two part conveyor elements.

The figures show a basically known device for coating a stack of goods 2 with a film or packaging film 4, which is usually stretch or stretch film today, in contrast to the previously used most to be applied by applying heat to the stack shrink film.

The device has a holder not shown in detail for receiving a film roll 6, which forms a supply of packaging film 4, wherein the film is often wound in the form of a gusseted tube.

A guide roller 8 and a pair of feed rollers 10 exemplify a film take-off device that can be controlled to peel a film portion having a predetermined length. In the unwinding 5 of the packaging film 4 seen below the film removal device 8, 10, a cutting device 12 with a knife arranged transversely to the film and a welding device 14 with arranged on both sides of the film welding beam 14 a, b are arranged.

Below the cutting and welding devices 12, 14 is a vertically downwardly facing inlet region 18 of a film transport device 20 which operates in a transport direction 21 and consists essentially of two conveying elements in the form of conveyor belts 22, 24, which within a conveyor region, with the Inlet area 18 begins and ends with a delivery area 26, at least in places pressed against each other. The film transport device transports the separated and one-sided welded film section lengthwise, wherein a longitudinal direction of the film section coincides with the transport direction 21.

Fig. 4 schematically shows that the film transport device can not only consist of two conveying elements, but that each conveying element can be formed of two or more sub-conveying elements that complement each other. For example, how Fig. 4 shows, a first conveying element of two first part conveying elements 22.1, 22.2 exist, which may be formed, for example, as conveyor belts or sub-conveyor belts and a uniform second conveyor element 24 in the form of a conveyor belt facing a film section 7 between the pressed against each conveyor or partial conveying elements frictionally is included. The conveying or partial conveying elements do not necessarily have to be conveyor belts, but it is also possible to use rollers, grippers or suction elements subjected to negative pressure, suction straps or the like. Find application.

In the illustrated embodiment, initially follows the inlet region 18, a horizontal conveyor region 28 in which the conveyor belts 22, 24 extend substantially horizontally. The horizontal conveying region 28 is adjoined by a vertical, upwardly extending conveying region 30, in the course of which the adjacent conveyor belts 22, 24 are deflected several times around horizontal deflecting rollers 32 in alternating directions which deviate slightly from the vertical, so that the conveyor belts 22, 24 as far as possible over a large part or the entire length of the vertical conveying region 30 are pressed against each other.

The vertical conveyor section 30 is adjoined by a horizontal transfer section 34 which terminates with the vertically downwardly directed delivery section 26 within a hoist frame 36 of the device. The dispensing area 26 is located above a film opening device 40 which has means for gripping and opening the film. Below the film opening device 40, which is fixedly connected to the Hubwerksrahmen 36, there is a vertically movable coating device 42, which has four arranged in the corners of a square or rectangle Reffbügel 44 for taking over and meeting a film section in the illustrated embodiment. The overdrawing device 42 is located between an in Fig. 1 and 2 shown Überziehegangshöhe H up to a Überziehendhöhe h vertically movable to pull a separated film section over the stack 2.

The Überziehegangshöhe H is dimensioned so that stacks 2 are processed with the greatest possible height of the device easily, while the Überziehendhöhe h just below a lower edge 2a of a stack 2, so that the film if necessary with "understretch", the lower edge 2a can be pulled over the pile.

The stack 2 itself is located on a conveyor 48 at a vertical distance F on a hall level 50 on which the device is arranged and are carried out from the work on the device, such as maintenance or repair work and replacement of the film roll. 6

To work on the feed rollers 10, the cutter 12 and the welder 14 and the replacement of the film roll 6 in a simple manner, for. B. by an operator who is on the hall level 50 to perform, said device elements should not be higher than, for example, 1.5 m above the hall level 50 to easily access it. The film roll 6 can be arranged higher, for example, up to 2 m or even higher, since it is not usually moved directly by an operator, but by means of a transport device, for example with a forklift.

Regardless of whether a hall level 50 is present as a "reference plane" for convenient location of the extractor and cutting and welding equipment there are significant advantages when said devices are below the stall height H, conveniently within a sheeting region V extending from below the stall height h to at most 50% or 75% of the stall altitude H.

LIST OF REFERENCE NUMBERS

2

stack

2a

lower edge

4

foil

4a

lower edge of film

5

unwinding

6

Film roll (film stock)

7

film section

8th

deflecting

10

feed rollers

12

cutter

14

welding equipment

14a, b

welding bars

18

intake area

20

Film transport means

21

transport direction

22

first conveyor belt (conveyor element)

22.1, 22.2

first partial conveyor belt (partial conveying element)

24

second conveyor belt (conveying element)

26

delivery area

28

horizontal conveying area

30

vertical conveyor area

32

guide rollers

34

Transfer area

36

lifting gear

40

Film opener

42

Pull-down device

44

folding frame

48

Conveyor

50

exhibition hall

H

Stall initial height

H

About Pulling height

F

Distance between 48 and 50

V

Film preparation area

Claims (15)

A method for wrapping a stack of goods (2) with a film (4), wherein a film section of a film supply (6) withdrawn, separated, opened by a film opening device (40) and pulled by a movable Überzieheinrichtung (42) on the stack (2) with the film section being transported lengthwise to the film opening device (40) after being pulled off and separated from a film transport device (20), characterized in that the film section from the separation to the film opening device (40) is frictionally engaged between at least two is pressed against each other, in a transport direction (21) moving endless circulating conveyor elements (22, 24). A method according to claim 1, characterized in that a lower film edge (4a) is pulled by pulling the overhanging device (42) from a top coat height (H) to a top coat height (h), the film portion below the top coat height (H) of the film stock (6) withdrawn and separated and transported by the film transport device (20) at least up to the Überziehegangshöhe (H). A method according to claim 2, characterized in that the film portion below the Überziehausgangshöhe (H) is welded to a closed-sided film hood. A method according to claim 1, 2 or 3, characterized in that the film portion within a film preparation area (V), which from below the stalling height (h) extends to at most 50% or 75% of the stall pass height (H), stripped and / or severed and / or welded. Method according to one of the preceding claims, characterized in that the film section at a height of at most 1m, 1.5m or 2m above a hall level (50) on which a wrapping device is arranged for performing the method, deducted and / or separated and / / or welded. A method according to claim 1, characterized in that the film section in the region of a first floor of a multi-storey plant deducted, separated and the film transport device (20) is supplied, wherein the to be wrapped stack (2) and the Folienöffnungs- and Überzieheinrichtungen (40, 42 ) are located in the area of a second floor above or below the first floor. Device for wrapping a product stack (2) with a film (4), in particular for carrying out the process according to one of the preceding claims, with a film supply (6), a film removal device (8, 10) for removing a film section, a cutting device (12) for separating the film section from the film supply (6), a film opening device (40) for gripping and opening the film section and a coating device (42) which is movable between a Überziegehgangshöhe (H) and a Überziehendhöhe (h), wherein between the cutting device ( 12) and the film opening device (40) a film transport device (20) is arranged, which is arranged to transport the separated film section lengthwise to the film opening device (40), characterized in that the film transport device (20) a first endlessly circulating Conveying element (22) and a against the first conveying element (22) gedrüc ktes second endless circulating conveyor element (24), which are drivable in a transport direction (21) and between which the Film section from the cutting device (12) to the film opening device (40) is frictionally receivable. Apparatus according to claim 7, characterized in that the film transport device (20) extends from below the stall height (H) to at least in the Überziehegangshöhe (H). Apparatus according to claim 7, characterized in that below the Überziehausgangshöhe (H) a welding device (14) is arranged for forming a film hood closed on one side. Device according to one of claims 7 to 9, characterized in that the film removal device (8, 10) and / or the cutting device (12) and / or the welding device (14) within a film preparation area (V), which from below the stall height (h ) to 50% or 75% of Überziehegangshöhe (H) ranges are arranged. Device according to one of claims 7 to 10, characterized in that the film removal device (8, 10) and / or the cutting device (12) and / or the welding device (14) at a height of at most 1m, 1.5m or 2m above a Hall level (50) on which the device is located, is arranged. A method according to claim 7, characterized in that the film supply (6), the film removal device (8, 10) and optionally the cutting device (12) in the region of a first floor of a multi-storey plant and the stack to be wrapped (2) and the film opening and overdrawers (40, 42) are located in the area of a second floor above or below the first floor. Device according to one of claims 7 to 12, characterized in that the film transport device (20) has an inlet region (18), a vertical conveying region (30), which extends into or above the coating transition height (H), and an adjoining transfer region (34 ), which extends over the over-pulling device (42) has. Device according to one of claims 7 to 13, characterized in that the film transport device (20) is arranged for transporting the film section up to a film delivery height, which is a handling measure above the Überziegehgangshöhe (H), wherein the handling measure of at least one Reffhöhe the film section the overdrawing device (42) corresponds. Device according to one of claims 7 to 14, characterized in that the film transport device (20) is designed as a film storage in which a predetermined length of film and / or a plurality of separated film sections can be stored.

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