EP1453750B1 - Device for producing foil rolls - Google Patents

Abstract

A device for producing film rolls, which is in particular suitable for producing coreless film rolls, comprises a roll holder for receiving a film roll comprising a film sheet to be wound off. The film sheet is wound up to a winding mandrel for producing the preferably coreless film roll. For producing in particular a coreless film roll the winding mandrel comprises a plurality of radially displaceable holding segments extending in longitudinal direction of the winding mandrel. After transfer of the winding mandrel, together with the wound-up film roll, to a transport means, the winding mandrel is transported to a delivery station. The delivery station serving for automatically delivering the wound-up film roll from the winding mandrel comprises a displacement means with the aid of which the holding elements of the winding mandrel are displaced into a delivery position. In this delivery position the outer diameter of the winding mandrel is smaller such that the film roll is delivered from the winding mandrel and falls onto a transport belt.

Description

The invention relates to a device for producing film rolls. In particular, the device can produce coreless film rolls, i. Film rolls that have no cardboard core or the like. Particularly suitable is the device for producing pre-stretched or stretched film webs.

An apparatus for producing coreless film rolls is known from WO 99/06312. The device described herein comprises a roll holder from which a film roll is received having a sheet to be unwound. It is an unstretched film web. The film web is unwound from this film roll, stretched by means of several rollers and wound on a winding mandrel. To stretch the film, at least one of the deflection rollers is embossed. Furthermore, the rotational speed of the individual deflection rollers can be varied so that this also causes a stretching. By a control device, the film web is wound onto the mandrel such that the first layers are unstretched or wound with a low voltage and only the subsequent layers of the film web are pre-stretched. This makes it possible to produce a coreless film roll, which can be removed again from the winding mandrel.

In order to remove the coreless film roll from the winding mandrel, winding mandrels are known which have a plurality of longitudinally extending segments or holding elements which are displaceable in the radial direction. The Movement is done by a pneumatic system. With the help of pneumatics, it is thus possible to change the circumference of the winding mandrel, ie the common circumference, of the segments arranged on a cylinder jacket surface.

The production of coreless film rolls with the known from WO 90/06312 device has the disadvantage that, the winding mandrel must be removed manually together with the wound on the winding mandrel film web from the machine, since the pre-stretched film web must calm down before the winding mandrel can be removed. It must therefore be possible to set the film over a certain period of time before removing the winding mandrel. The required manual operation increases the production costs for in particular pre-stretched film rolls.

Other devices for producing coreless film rolls are e.g. in US 6,047,916, which is considered as the closest prior art, as well as in US 4,667,890.

The object of the invention is to further automate the production process of film rolls, in particular of pre-stretched film rolls without a core.

The object is achieved according to the invention by the features of claim 1.

According to the invention, the device for producing rolls of rolls has a delivery station for the automatic delivery of the wound film roll from the winding mandrel. For this purpose, the discharge station comprises a displacement device for displacing the holding elements of the winding mandrel. The holding elements of the winding mandrel, which are preferably displaceable radially to the longitudinal direction of the winding mandrel, serve for varying the outer diameter of the winding mandrel. By the displacement device according to the invention, the holding elements are moved to a delivery position. In the dispensing position, the holding elements of the mandrel have a smaller distance from each other. The circumference of the winding mandrel is thus reduced in the delivery position. Since the mandrel in the dispensing station according to the invention preferably vertically is disposed, the wound film roll after pressing the displacement device of the winding mandrel also slip down due to gravity.

Due to the automatic removal or removal of the wound film roll from the mandrel eliminates a previously manually executed by operating personnel step. The inventive increase in the degree of automation of the device for producing film rolls a significant cost reduction is achieved.

To assist the delivery of the film roll from the winding mandrel, a stripping device for stripping the film roll from the winding mandrel is preferably provided. The stripping device is preferably a plunger which can be displaced in the longitudinal direction of the winding mandrel. The plunger can be actuated hydraulically and / or pneumatically. As a plunger, for example, a winding mandrel surrounding tubular plunger may be provided so that when stripping the film roll from the mandrel tilting and thereby possibly caused damage to the inner layer of the film roll is avoided. It is also possible to provide a lateral ram arranged next to the mandrel.

The holding elements of the winding mandrel can be converted by springs or a spreading device from a delivery position into a receiving position and vice versa. Here, the holding elements in the dispensing position at a smaller distance, so that the winding mandrel has a smaller diameter than the inner diameter of the film roll. In contrast, the holding elements of the winding mandrel in the receiving position in which the film strip is wound onto the winding mandrel, preferably for producing a coreless film roll, a greater distance, so that the winding mandrel has a larger substantially corresponding to the inner diameter of the film roll diameter. To move the Holding elements, for example, a spreading device, as described in the post-published German Utility Model DE 201 15 648 be provided. Preferably, the holding elements are hydraulically and / or pneumatically actuated, since the hydraulic and / or pneumatic actuation of the holding elements brings less maintenance and it is easier to automate.

Preferably, the displacement device has a relaxation device. By the relaxation device, the holding elements are relaxed, so that they are automatically transferred to the delivery position. For example, springs by which the holding elements are biased in the receiving position, can be solved. Preferably, the biasing of the holding elements takes place pneumatically and / or hydraulically, so that the expansion device is preferably designed such that a pressure reduction takes place through it. For this purpose, the winding mandrel preferably has a valve which can be opened automatically by the expansion device. By opening the valve, a pressure reduction and thus a relaxation of the holding elements takes place. Preferably, the retaining elements are connected to a return device such as a spring. The return device is used so that the holding elements can not jam in the receiving position, but always be returned to the discharge position as soon as the pressure is reduced.

To further increase the degree of automation of the device according to the invention, this preferably has a transport device. By means of the transport device, the mandrels are transported from a winding station to the delivery station after being wound onto the preferably pre-stretched film web. For this purpose, the transport device preferably has a plurality of winding mandrel holders. The winding mandrels provided with the wound film roll are removed from the winding station and transferred to the transport device or the winding mandrel holders of the transport devices. You can do this be provided at the transfer station separate handling devices through which an automatic transfer of provided with the film roll winding mandrels takes place. Preferably, the mandrels are arranged in the winding station between two brackets. The brackets can also be used to drive the winding mandrel for winding the film strip on the winding mandrel. Preferably, the brackets are connected to a displaceable or pivotable support arm to remove the winding mandrel together with the wound-up film roll at the transfer station from the take-up station and transfer it to the transport device.

The mandrel holders of the transport device are preferably designed such that the mandrels are arranged vertically in the mandrel holders. In particular, the mandrels are mounted in the winding mandrel holders. For this purpose, the mandrels preferably have a suitable head-like magnification, which can be placed on substantially U-shaped horizontally arranged mandrel holders. The mandrels can be inserted or removed in such U-shaped winding mandrel holders in the horizontal direction.

After relaxing the holding elements of the winding mandrels in the displacement device, ie after the film roll has been removed from the winding mandrel, if necessary with the assistance of the stripping device, the mandrels are re-tensioned. Here, the holding elements of the winding mandrels are brought into their receiving position in which they serve in the winding station for receiving the film strip. In this case, a roll core, such as a cardboard core, can be received in the receiving position, onto which the film is then wound up. Thus, it is possible to wind such a winding web on such winding mandrels as described above in such a way that coreless film rolls can be produced.

In the preferred use of pneumatically or hydraulically displaceable holding elements of the winding mandrels, the biasing of the holding elements in the clamping station is effected by a pressure increase in the winding mandrel, through which the holding elements are displaced in the radial direction. For this purpose, a preferably displaceable feed head, which is connected to a pneumatic or hydraulic device, is provided at the tensioning station. By moving this head is preferably the valve, which is also opened to reduce the pressure in the discharge station, opened and preferably supplied compressed air to the winding mandrel.

It is also possible to form the dispensing station and the tensioning station as a common station. This has the advantage that the expansion device, by which the pressure reduction takes place, can be designed such that immediately after the pressure reduction and the stripping of the film roll from the mandrel of the pressure increases again and the holding elements can be brought back into the receiving position.

To further increase the degree of automation, the transport device is preferably designed as an endless transport device. By the transport device, the mandrels are thus taken over at the transfer station together with the wound on the winding mandrel film roll and automatically transported to the discharge station. After dispensing the film roll, the mandrels are then possibly transported to the tensioning station. From this there is an automatic transport to the transfer station at which now a winding mandrel is transferred with holding elements located in the receiving position to the winding station. In particular, it is advantageous to design the transport device such that the mandrels are transported together with the wound-up film roll over a predetermined minimum period of time between the transfer station and the delivery station. This ensures that this pre-stretched film is sufficient, so that a simple dispensing or stripping the film roll of the Winding mandrel is possible. Such a calming section reduces the occurrence of disturbances. As a transport device, for example, a chain may be provided with in particular arranged at regular intervals winding mandrel holders. Preferably, the transport device is wheel-shaped or plate-shaped, wherein the winding mandrel holders are arranged radially and are moved on a circular line.

The invention will be explained in more detail with reference to a preferred embodiment with reference to the accompanying drawings.

Fig. 1

eine schematische Draufsicht der erfindungsgemäßen Vorrichtung,

Fig. 2

eine schematische Vorderansicht einer Wickeldorn-Halterung der Transporteinrichtung,

Fig.3

eine schematische teilweise geschnittene Draufsicht der Wickeldorn-Halterung,

Fign. 4 und 5

schematische Vorderansichten der Abgabestation und

Fig. 6

eine schematische Vorderansicht der Spannstation.

Show it:

Fig. 1

a schematic plan view of the device according to the invention,

Fig. 2

a schematic front view of a winding mandrel holder of the transport device,

Figure 3

a schematic partially sectioned plan view of the winding mandrel holder,

FIGS. 4 and 5

schematic front views of the dispensing station and

Fig. 6

a schematic front view of the clamping station.

The device according to the invention for producing film rolls has a roll holder 10 in accordance with the basic structure shown in FIG. From the roll holder 10, a film roll 12 is supported with generally unstretched film. A film strip 14 is unwound from the film roll 12 and guided over a plurality of deflection rollers 16, 18. Usually, such devices have a plurality of rollers 16, 18, partially with a Drive means are connected, wherein the rotational speed of the individual rollers 16, 18 may vary. This can be done stretching the film web 14. In particular, one or more rollers of the rollers 16, 18 may be embossed to assist in stretching the film web 14.

The film web 14 is wound on a winding mandrel 20 after passing through the deflection rollers 16, 18. After winding a predetermined length of the film web 14 on the mandrel 20, a severing of the film web 14 by means of a separator 22, which has, for example, a knife.

In the illustrated embodiment, with the aid of an automatic, not shown handling device of the winding mandrel 20 with the wound film, i. taken along with the produced film roll 24 and a new winding mandrel 20 inserted into the device. For this purpose, the handling device has e.g. an arm, at the front end of a gripper is attached. With the help of the gripper, the winding mandrel 20 is removed together with the wound on this film roll 24 of the device.

After removal of the film roll 26 having winding mandrel 20 from the device, the insertion of a new winding mandrel 20 takes place in the device by means of the handling device.

The handling device can be designed such that it also carries the winding mandrel 20 during the winding of the film web 14 onto the winding mandrel and, if necessary, drives it. For this purpose, the winding mandrel 20, for example, at the two opposite end faces conical recesses 22 (Fig. 4), engage in the corresponding tips. The two opposing tips can be attached to a common arm and be pivotable by means of this. By pivoting the arm of the winding mandrel 20 is pivoted from the winding station 26 in the direction of a winding mandrel holder 28 in the transfer station 30.

Subsequently, the trained as a plate or wheel transport device 32 is rotated in the direction of the arrow 34 by one station in the illustrated embodiment. Here, the winding mandrel holder 28 is rotated clockwise to the next position. After rotating the transport device, the winding mandrel holder 28 is located with the empty winding mandrel 20 in the transfer station 30. Here, the winding mandrel 20 is gripped by moving the tips into the conical recesses 22 and pivoted so that it enters the winding station 26.

On the winding mandrel 20 newly inserted into the winding station 26, the next piece of film web 14 is wound, which in turn is unwound from the film roll 12, on which a considerably longer film web is wound, so that a plurality of film rolls 24 can be produced.

The winding mandrel holder 28 is U-shaped in cross-section and has two mutually opposite substantially parallel arms 36. The winding mandrel holder is open in the radial direction with respect to the plate-shaped transport device 32 so that winding mandrels 20 can be removed from the winding mandrel holder in the direction of an arrow 38 (FIG. In order to avoid slipping out of the winding mandrel 20 from the mandrel holder 28, preferably at least in one of the two arms 36, two Hatte- or securing means 40 are provided. In the illustrated embodiment, it is at the securing devices to a biased spring 42 with a ball 44. When removing or inserting the winding mandrel 20 In the winding mandrel holder 28 in the direction of arrow 38, the ball 44 is pressed against the spring force into the arm 36. As a result, slipping out of the winding mandrel 20 is prevented from the winding mandrel holder 28.

Each winding mandrel 20, a single winding mandrel holder 28 is provided, in which the winding mandrel 20 is mounted vertically. For this purpose, the winding mandrel 20 has a disk-shaped head 44 (FIG. 4) which rests on an upper side of the arms 36.

The transport device 32 (FIG. 1) has 12 winding mandrel holders 28 in the illustrated embodiment. After nine transport steps, a wound in the winding station 26 on the winding mandrel 20 film web 14 passes after transfer to the transport device 32 in the transfer station 30 in a delivery station 46. During transport of the film roll 24 from the transfer station 46 is a calming or setting the pre-stretched film. This calming section or calming phase is required in order to strip the film roll produced as a coreless film roll 24 in the illustrated embodiment from the winding mandrel 20.

For stripping the film roll 24 from the mandrel 20, the dispensing station 46 (FIGS. 4 and 5) has a displacement device 48. The displacement device 48 is used to move in the longitudinal direction of the winding mandrel 20 extending retaining segments 50. The retaining segments 50 are in the illustrated embodiment pneumatically in the radial direction of the winding mandrel 20 slidably. By moving the holding elements 50 in the radial direction, the diameter of the winding mandrel 20 can be varied. For stripping the film roll 24 from the winding mandrel 20 or the holding elements 50 of the winding mandrel 20, the displacement device 48 is moved in the direction of an arrow 52. As a result, a tip 54 presses on a valve 56 and opens it. As a result, the air present in the winding mandrel can escape through a channel 58. This results in that the holding elements 50 are displaced radially in the direction of the winding mandrel 20 inwardly into a dispensing position, wherein the outer diameter of the winding mandrel 20 is reduced. For this purpose, for example, a spring element or the like may be provided in the winding mandrel 20, through which the holding elements 50 are pulled inwards.

The outer diameter of the winding mandrel 20 is less than the inner diameter of the film roll 24 after the air has been released. Since the winding mandrel 20 hangs vertically in the winding mandrel holder 28, the film roll 24 can now be moved by the winding mandrel 20 or the holding elements 50 of FIG Slip winding mandrel 20 and fall on a conveyor belt 60 (Fig. 1). The conveyor belt 60 then conveys the individual film rolls 24, for example, to a further processing device such as a packaging device.

Since the inner layers of the film roll 24 may adhere to the support members 50 of the winding mandrel 20, gravity is sometimes insufficient so that the film roll 24 does not automatically deflect after reducing the pressure in the winding mandrel, i. decreasing the diameter of the winding mandrel to slip down therefrom. To assist in stripping the film roll 24 from the winding mandrel 20, a stripping device 62 is provided. In the illustrated embodiment, the stripping device 62 is a plunger 64 which is displaceable in the direction of an arrow 66. The plunger 64 is disposed adjacent to the winding mandrel 20 and presses on a side surface of the film roll 24, so that it is pushed down in the longitudinal direction of the winding mandrel 20 of this.

During stripping of the film roll 24 from the winding mandrel 20 in the delivery station 46 (FIG. 1), the next piece of film 14 in the take-up station 26 is wound onto the winding mandrel 20 located in the take-up station. Once the stripping of the film roll 24 in the delivery station 46, the winding of the next film web piece 14 on the winding mandrel 20 in the winding station 26 and the transfer of now provided with a film roll winding mandrel 24 is carried to the transport device 32 in the transfer station 30, the transport device 32 again rotated by a further transport step in the direction of arrow 34. As a result, the winding mandrel 20 passes from the delivery station 46 into a tensioning station 68 (FIGS. 1 and 5). In the tensioning station, the holding elements 50 of the winding mandrel 20 are stretched again, ie the Outer diameter of the winding mandrel 20 is increased again, so that the holding elements 50 are again in the receiving position, ie on the winding mandrel 20 again a film web 14 can be wound. For this purpose, air is pumped into the winding mandrel 20 via a pneumatic head 70. The pneumatic head 70 is connected via a hose 72 to a pressure generating device. To move the holding elements 50, the pneumatic head 70 is displaced in the direction of an arrow 74, so that a projection 76 opens the valve 56 and air can be pumped through the channel 58 into the winding mandrel 20. As a result, the holding elements 50 are displaced or biased radially outward. The newly pretensioned winding mandrel 20 is returned to the winding station 26 in the transfer station 30 after two long transport steps of the transport device 32 in the direction of the arrow 34 (FIG. 1).

Claims (12)

1. A device for producing film rolls (24), in particular coreless film rolls, comprising
   a roll holder (10) for receiving a film roll (12) comprising a film sheet (14) to be wound off,
   a winding mandrel (20) to which the film sheet (14) is adapted to be wound up for producing the film roll (24),
   wherein the winding mandrel (20) comprises a plurality of displaceable holding elements (50) arranged in the longitudinal direction of the winding mandrel (20) for changing the outer dimensions, and
   a delivery station (46) for automatically delivering the wound-up film roll (24) from the winding mandrel (20) arranged vertically in the delivery station (46),
   wherein the delivery station comprises a displacement means (48) for displacing the holding elements (50) into a delivery position.
2. The device according to claim 1, characterized in that the displacement means comprises a relief device (48) for allowing the holding elements (50) to relieve.
3. The device according to any one of claims 1-2, characterized in that the holding elements (50) are hydraulically and/or pneumatically biased into a receiving position and the relief device (48) places the holding elements (50) by pressure reduction into the delivery position.
4. The device according to claim 3, characterized in that the winding mandrel (20) comprises a valve (56) adapted to be opened for pressure reduction.
5. The device according to any one of claims 1-4, characterized by a pull-off means (62) for pulling the film roll (24) off the winding mandrel (20).
6. The device according to claim 5, characterized in that the pull-off device (62) comprises a ram (64) adapted to be displaced in longitudinal direction of the winding mandrel (20).
7. The device according to any one of claims 1-6, characterized by a transport means (32) for transporting the winding mandrel (20) from a wind-up station (26) to the delivery station (46).
8. The device according to claim 7, characterized in that the transport means (32) comprises a plurality of winding mandrel holders (28) for the preferably vertically holding of winding mandrels (20).
9. The device according to claim 8, characterized in that the winding mandrel holder (28) is configured such that the winding mandrel (20) is adapted to be hung up.
10. The device according to any one of claims 1-9, characterized by a tensioning station (68) for placing the holding elements (50) into a receiving position.
11. The device according to any one of claims 1-10, characterized by a transfer station (30) for transferring the winding mandrel from the transport means (32) to the wind-up station (26).
12. The device according to any one of claims 7-11, characterized in that the transport means (32) is configured as an endless transport means.

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