WO2003072439A1

WO2003072439A1 - Method and device for producing packagings

Info

Publication number: WO2003072439A1
Application number: PCT/DE2002/004621
Authority: WO
Inventors: Hermann J. Solbach; Helmut Endler
Original assignee: Stora Enso Baienfurt Gmbh & Co. Kg
Priority date: 2002-02-21
Filing date: 2002-12-18
Publication date: 2003-09-04
Also published as: EP1476360A1; DE10207472A1

Abstract

The invention relates to a method and device for producing an imprinted paper or paperboard packaging provided with a security marking (19). The inventive method consists of the following steps: placing the security marking (19) on at least one side of a running material web consisting of paper or paperboard by means of at least one laser; capturing the material removed by the laser; dividing the marked and cleaned material web into sheets (10), imprinting the sheet (10) from at least one side; cutting out or punching out a blank (23) for the packagings consisting of the imprinted and marked sheet (10), and; folding the blank (23) to form a packaging.

Description

"Method and device for producing packaging"

The invention relates to a method and a device for producing printed paper or cardboard packaging.

It is known to provide packaging with labels on the outside by means of a laser. The marking is created by burning off a layer of paint with which the packaging is coated.

Furthermore, it is known from DE 200 16 660 Ul to coat paper or cardboard in the manufacturing process with fibers capable of luminescence. This makes it possible, for example, to identify such a box with the aid of a UV lamp and thus to draw conclusions about its origin.

In the prior art, it is considered disadvantageous that labeling is only carried out either during packaging or during the manufacturing process of the paper or cardboard. Marking the individual boxes during packaging makes the packaging process, which already consists of a large number of There are individual steps, even more complex. Furthermore, a malfunction of the marking device means that the entire packaging system is at a standstill or that the unmarked packaging is laboriously reworked. The marking of paper or cardboard in the manufacturing process means that huge quantities of a special type of paper or cardboard have to be produced, which may be far above the required requirements. Furthermore, such coated materials are not without problems because of the additives in direct or indirect recycling.

The invention is based on the object of developing a method and a device which make it possible to produce customer-specific quantities of paper or cardboard packaging with security marking, which are not critical with regard to recycling and whose marking does not interfere with the complex manufacturing processes such as printing, punching, Folding and packing means.

This object is achieved by the method defined in claim 1 and the device defined in claim 7.

The method according to the invention for producing a printed paper or cardboard packaging which has a security marking envisages first applying or burning in the security marking by means of a laser onto an upper side or underside of a paper or cardboard web running at a constant or variable speed. After the marking process, the erosion caused by the removal of paper or cardboard is removed. This cleaning step is followed by the division of the paper or cardboard web into sheets or a rolling up of the paper or cardboard web. This is followed by printing on at least one side of the sheets or the roll previously produced and cutting or punching out the blanks for - j -

the packing. In the last step, the blanks are unfolded into packaging. The position of the individual laser markings in relation to one another is selected such that each blank lying on the sheet has at least one complete marking. By moving the marking process from the paper manufacturing process to a production step downstream of the manufacturing process, it is also possible to produce small quantities of paper or cardboard for certain packaging. This is possible above all because the marking process can be started or interrupted as desired by switching the laser on or off. Furthermore, after the security marking process step, it is also easily possible to assign the sheets or rolls generated to a special customer or special order. By marking during operation, the marking process does not mean an extension of the process time.

An advantageous embodiment of the subject matter of the invention provides for the use of a running material web for the application of the security marking which is present on a so-called cross cutter between a roll and the cutting device. This makes it possible to integrate the marking process into an existing machining process. Alternatively, marking the material web when dividing or rewinding the parent roll into smaller rolls is also conceivable. In this way, a paper roll is produced which has security markings over its entire length or only in sections. Furthermore, it is also conceivable to carry out a complete or partial marking in a rewinding process in which the web is wound from a first spool onto a second spool.

It is advantageous for the material burned off the web by the laser to be connected downstream of the laser Remove the suction device so that the printing on the paper or cardboard is not adversely affected by impurities present on the paper or cardboard.

According to the invention, it is further proposed that the laser preferably be used to apply a regular pattern of markings to the material web. This makes it possible to choose a pattern or an arrangement of markings which guarantees that regardless of the later position of the blanks on the material web, each blank has at least one marking.

Furthermore, the invention provides a marking device which comprises a laser and acts with it on an upper side or underside of a moving and unprinted material web. By acting on the material web with a laser, it is possible to act on the material web without contact and at high web speeds and to mark it. This means that marking takes place without impairing the method step to which the device is assigned. For the purposes of the invention, a laser is understood to mean a device for generating a laser beam.

It is also advantageous to arrange the laser in front of a cutting device and / or a retractor. This can be implemented in a technically simple manner, since the material web is regularly guided freely over a larger distance in front of a cutting device and / or a reeling device. This also applies to an area downstream of a rolling device.

In particular, it is advantageous to use a so-called cross cutter, which divides material rolls by unwinding and then cutting them into sheets, between the unwinding device and the cutting device to be arranged, since the material web is regularly guided freely here.

It is also provided that the laser acts on an uncoated side of the material web. This creates a marking that is not recognizable at first glance, since it is burned into a homogeneously constructed layer. Such a marking increases the likelihood of being overlooked by a copycat and thus leads to an incorrectly identifiable copycat product with a higher probability.

It is particularly advantageous to use a so-called mask laser for marking, which is rigidly aligned with the material web and in which the shape of the marking is determined by a template or mask. Replacing the mask thus allows the emblem to be burned in to be changed quickly without the need for complex laser beam guidance.

By "printing" the material web with, in particular, laser markings distributed regularly over the material web, if the laser markings are arranged in a sufficiently dense arrangement, it is possible to ensure that any blank, which has a minimum size and is subsequently produced from the material web, bears at least one complete identification, which is not on a fold line or punching line. If the pattern applied is designed for the smallest blank in terms of its arrangement, then the device can be operated with this setting for the production of all sheets.

According to one embodiment variant, the number of exposures per unit of time which the laser emits, as a function of the web speed, is controlled by a controller to regulate. This makes it possible, even at different web speeds, to provide the material web with laser markings which have the same distances from one another in the running directions.

According to a further embodiment variant, it is provided that the working cycle of the laser or lasers is additionally controlled as a function of the position of the blanks on the material web or the sheet cut therefrom. This makes it possible to precisely predetermine the position of the laser marking on the blank. This also enables cuts that are irregularly arranged on the sheet or have different sizes to be marked at predefined locations. This enables the packaging in question to be checked more quickly later, since the manufacturer knows the exact location of the security marking and this is not sought. An increased effort for a counterfeiter is given because the counterfeiter is forced to adhere exactly to the position of the security marking on the original.

According to the invention, the use of a TAE-C0 ₂ laser with a pulse frequency of up to 100 Hz and an energy density of up to 1.8 joules / cm ^{2 is} provided in particular as a mask marker. With such a laser, good results can be achieved in particular with the types of cardboard customary for packaging.

Furthermore, it is provided to generate at least two markings on the material web by deflecting the beam of the laser. This makes it possible to implement the device particularly cost-effectively.

In particular, the invention provides for exposing fields of approximately 2 x 2 mm to 4 x 4 mm on the material web with the laser. The exposure of such fields is also at high web speeds possible without tracking the laser.

Furthermore, the invention provides for the laser to be followed by a collecting device in the direction of travel of the material web, which, for example, sucks or sweeps away the material removed by the laser. This in particular prevents such contamination from impairing the printing of the sheets cut from the material web.

According to the invention, the laser markings are applied in particular at a distance of at least about 50 mm from one another. This ensures the marking of common box sizes with at least one marking.

Finally, the invention provides a movable and / or pivotable and / or telescopic arrangement of the laser in order to be able to vary the distance of the laser to the material web, the angle of the laser to the material web and the number of lasers or the distance of the individual lasers from one another.

Further details of the invention are described in the drawing using schematically illustrated exemplary embodiments. Here shows:

FIG. 1 shows a schematic side view of a cross cutter with a laser device,

FIG. 2 shows a schematic side view of a printing and punching device, FIG. 3 shows a punched-out blank for packaging,

Figure 4 is a perspective view of a package

FIG. 5 shows a plan view of an arch which has a regular pattern of security markings,

FIG. 6 shows a plan view of an arch which has an irregular pattern of security markings,

FIG. 7 shows a top view of a punched and printed sheet which has a regular pattern of security markings,

FIG. 8 shows a top view of a punched and printed sheet which has an irregular pattern of security markings,

Figure 9 is a side view of a

Unwinding device which is assigned to a laser device,

FIG. 10 shows a side view of a first part of a cross cutter,

Figure 11 is a side view of a second

Part of the cross cutter shown in Figure 10 and Figure 12 is a plan view of the cross cutter shown in Figures 10 and 11.

FIG. 1 shows a schematic side view of a cross cutter 1 with a device 2 according to the invention. The cross cutter 1 essentially consists of a unwinding device 3, guide rollers 4, a longitudinal knife 5, transverse knives 6 and a pallet 7. The unrolling device 3 receives a roll 8 from which is rolled off a material web 9, which is guided by the guide rollers 4 and cut into sheets 10 by the knives 5, 6. The material web 9 moves in an arrow direction x with a constant or variable web speed v. The device 2 is constructed as a laser device 11 and essentially consists of a bed 12 which carries a crossmember 13 to which a laser 14 is fastened via a swivel arm 15. The swivel arm 15 is rotatably mounted on the cross member 13. The laser 14 is connected to the swivel arm 15 via a ball joint, not shown. The laser 14 acts with a laser beam 16 on an underside 17 of the material web 9. According to an embodiment variant, not shown, it is also provided that a laser acts on an upper side 18 of the material web 9. The laser beam 16 acts on the running material web 9 with time interruptions similar to a stroposcope. Here, security markings 19 (see e.g. FIG. 5) are burned into the underside 17 of the material web 9. A suction device 20 is associated with the laser 14, which suction device sucks off the burn-off that occurs during the lasering of the material web 9. The one with the

Sheets 10 providing security markings 19 are stacked on the pallet 7 and passed on to the machines 21, 22 shown in FIG. FIG. 2 shows a schematic side view of the printing machine 21 and the punching machine 22. The sheets 10 delivered on the pallet 7 are first printed in the printing machine 21. The blanks 23 are then punched out (see, for example, FIG. 3) from the printed sheets 10 ′ and the punched sheets 10 ″ are stacked on a further pallet 24.

FIG. 3 shows one of the blanks 23, which has one of the security markings 19 on a base tab 25. The blank 23 has an inside 26 facing the viewer and can be folded by folding fold lines 27 by approximately 90 ° to form a cuboid packaging 28 shown in FIG. In the unfolded packaging 28, the security marking points into an interior 29. It is thus possible to check the identity of the packaging 28 by looking into its interior 29 with a suitable lighting means.

An arch 10 is shown in an idealized manner in FIG. This sheet has security markings 19 which form a regular pattern 30 on the sheet 10.

FIG. 6 shows a further sheet 10 shown in an idealized manner. This has security markings 19 which are arranged irregularly and form an irregular pattern 31 on the sheet 10.

FIG. 7 shows a sheet 10 on which security markings 19 are arranged at regular grid spacings a, b. Furthermore, blanks 23 provided on the sheet 10 are indicated by fold lines 27 and punch lines 32. The blanks 23, like the security markings 19, are regularly arranged on the sheet 10. The security markings 19 and the blanks 23 are aligned to each other so that the security markings 19 come to lie on the inner sides 26 of cover flaps 33 of the blanks 23.

In Figure 8 a sheet 10 is shown on which security markings 19 e.g. are arranged at irregular intervals c, d, e or f, g, h and in an irregular orientation. Like the security markings 19, different blanks 23, 23 ', which are indicated by fold lines 27 and punched lines 32, are irregularly distributed on the sheet 10. Here, the blanks 23, 23' and the security markings 19 are matched to one another such that the security markings 19 regularly come to rest on the inside 26 of cover flaps 33 of the blanks 23. For such an alignment of the security markings 19 with the blanks 23, provision is made, for example, to control a laser device assigned to a cross cutter depending on the format of the sheets, the position of the blanks and the size of the blanks.

FIG. 9 shows a schematic partial view of a cross cutter 1, which essentially corresponds to the cross cutter shown in FIG. 1. In the partial view shown in FIG. 9, a rolling device 3 is shown, on which a material web 9 is unwound from a roll 8. The material web 9 is guided freely in an area 34 between guide rollers 4. A laser device 11 is arranged in the region 34 below the material web 9. This essentially consists of a laser 14, which is directed onto an underside 17 of the material web 9 and is supported by a base frame 35 so as to be displaceable, pivotable and spring-loaded. A sensor arrangement 36 is assigned to the laser 14 and is used to detect a web speed v of the material web 9. The The sensor arrangement 36 shown mechanically detects the speed of the material web by means of a contact roller 37. According to an embodiment variant, not shown, an optical, contactless detection of the speed v of the material web 9 is also provided.

FIG. 10 shows a partial view of a further cross cutter 1. In this partial view, a roll-off device 3, which rolls a material web 9 from a roll 8, guide stations 38, 39 and a first part of a cutting station 40 are shown as essential components of the cross cutter 1. Between the guide stations 38, 39, in which the material web 9 is guided by guide rollers 4, the material web 9 runs freely in an area 34. The area 34 is provided for the arrangement of a symbolically represented laser device 11.

FIG. 11 shows a further partial view of the cross cutter 1 shown in FIG. 10. A conveyor 41 and a stacking device 42 are connected to the cutting station 40, which is already partially shown in FIG. After the material web 9 is provided with safety markings (not shown) by the laser device 11, the material web 9 is cut into individual sheets in the cutting device, which are transported from the conveying device 41 to the stacking device 42 and are placed there on pallets 7 and transported away.

Figure 12 shows a simplified plan view of the embodiments shown in Figures 10 and 11 cross cutter 1. In the plan view is again clear that the material web or the sheets produced from the web of material through the cross cutter 1 in a ^'direction of the arrow x. In this case, the laser device 11 is integrated in the cross cutter 1 such that its retrofitting does not require the cross cutter 1 to be converted requires, nor affects the working speed or operation of the cross cutter negatively.

The invention is not restricted to the exemplary embodiments shown or described. Rather, it encompasses further developments of the invention within the scope of the property right claims. In particular, it is also provided that the security markings are applied in a process section in which a roll is divided into rolls of smaller width by rolling, slitting and rolling up. Here, an arrangement of the marking device is provided before or after the cutting device. Furthermore, it is provided, for example when using gravure printing processes, in which the material to be printed is usually fed to the machine from the roll, to arrange the marking device between the unwinding device for the roll and the printing press. Alternatively, it can also be provided to connect the marking device to the printing press and to carry out the marking before the material web leaving the printing press is divided into sheets. According to the invention, the security marking is in particular provided on an inside of the packaging.

Reference symbol list:

1 cross cutter

2 device

3 unwinding device

4 guide roller

5 longitudinal knives

6 cross knives

7 pallet

8 roll

9 material web

10 sheets

10 'printed sheet

10 '' printed and die cut sheet

11 laser device

12 bed

13 traverse

14 lasers

15 swivel arm

16 laser beam

17 bottom (of 9)

18 top (of 9)

19 Security marking

20 suction device

21 printing press

22 punching machine

23 cut 23 'cut

24 pallet

25 bottom flap

26 inside (from 23, 23 ')

27 fold line

28 packaging

29 interior (of 28)

30 regular patterns

31 irregular pattern 32 punching line

33 lid flap

34 area

35 base frame

36 sensor arrangement

37 Contact role

38 Management station

39 command station

40 cutting station

41 conveyor

42 stacking device

Claims

Expectations :

1. A method for producing a printed paper or cardboard packaging (28) with a security marking (19), which comprises the following steps:

- applying the security marking (19) to at least one side (17, 18) of a running material web (9) made of paper or cardboard by means of at least one laser (14),

Collecting the material removed by the laser (14),

- division of the marked and cleaned material web (9) into sheets (10) or rolling up the marked and cleaned material web (9),

- printing the sheet (10) or the material web (9) from at least one of the sides (17, 18),

- Cutting or punching out a blank (23) for the packaging (28) from the printed and marked sheet

(10 ') and

Folding the blank (23) into the packaging (28),

- The arrangement of the security markings (19) is selected such that each blank (23) lying on the sheet has at least one complete security marking (19).

2. The method according to claim 1, characterized in that the material web (9) on a so-called cross cutter (1) is unwound from a roll (8) and then divided by cross sections and preferably also longitudinal cuts into the sheets (10).

3. The method according to any one of the preceding claims, characterized in that the material removed by the laser (14) is sucked up by a suction device (20).

4. The method according to any one of the preceding claims, characterized in that the printed sheet (10 ') is divided into several blanks (23).

5. The method according to any one of the preceding claims, characterized in that the material web (9) by the laser (14) is preferably provided with a regular pattern (30).

6. The method according to any one of the preceding claims, characterized in that each blank (23) later formed from the material web (9) is marked at least once by the laser (14).

7. Marking device for generating a security marking (19), characterized in that the device (11) comprises at least one laser (14) which is aligned with a moving, unprinted (9) material web.

8. The device according to claim 7, characterized in that the laser (14) is arranged in front of a cutting device (5, 6) and / or in front of a retractor and acts on at least one side (17, 18) of the material web (9).

9. The device according to claim 7 or 8, characterized in that the device (11) is arranged after a rolling device (3).

10. Device according to one of claims 7 to 9, characterized in that the device (11) on a so-called cross cutter (1), which produces sheets (10) from a paper or cardboard web (9) by cutting in at least one direction, is arranged between a rolling device (3) and a cutting device (5, 6) of the cross cutter (1).

11. Device according to one of claims 7 to 10, characterized in that the device (11) with the laser (14) acts on an uncoated side (17, 18) of the material web (9).

12. Device according to one of claims 7 to 11, characterized in that the laser (14) is designed as a mask laser.

13. The device according to one of claims 7 to 12, characterized in that the device (11) provides the material web (9) with a pattern (30, 31) of laser markings (19), the laser markings (19) preferably regularly over the Material web (9) is divided.

14. Device according to one of claims 7 to 13, characterized in that the laser activity is controlled as a function of the web speed (v).

15. Device according to one of claims 7 to 14, characterized in that the laser activity is controlled as a function of the position of the blanks (23) on the sheet (10, 10 ', 10 ").

16. Device according to one of claims 7 to 15, characterized in that the laser (14) is designed in particular as a TEA-C0 ₂ laser with a pulse frequency of approximately 25 hearts and an energy density of preferably approximately 1.8 j / cm ² ,

17. Device according to one of claims 7 to 16, characterized in that the laser (14) generates a laser beam (16) which is directed by a beam deflection on at least two masks.

18. Device according to one of claims 7 to 17, characterized in that the laser (14) on the material web (9) marks at least one field of about 2mm x 2mm to about 4mm x 4mm during an exposure.

19. Device according to one of claims 7 to 18, characterized in that the laser (14) is followed by a collecting device (20) which is removed by the laser (14)

Catches material.

20. Device according to one of claims 7 to 19, characterized in that the pattern (30, 31) consists of laser markings (19) which are applied at a distance (a, b) of at least about 50 mm.

21. The device according to one of claims 7 to 20, characterized in that the laser (14) is arranged to be movable and / or pivotable and / or telescopic on a crossmember (13) arranged transversely to the running direction (x).