EP4056337B1 - Method for contour punching an initial stack of sheet material and punching device for performing the method - Google Patents

Description

The present invention relates to a method for contour punching an initial stack of sheet material, in particular for punching out labels from an initial stack of sheet material. The invention further relates to a punching device for carrying out the method.

The method according to the invention and the device according to the invention are used in particular for punching an initial stack formed from a large number of sheets lying one above the other and provided with a label print. The initial stack of sheet material consists in particular of printed paper. In special cases, the individual labels are made of plastic, in particular a plastic film.

The initial stack to be punched is in particular a pre-cut stack of panels that has a cuboid shape. In this respect, the method or the device serves to give the pre-cut stack of benefits its final contour. Labels are usually printed on large printed sheets that are stacked on top of each other to form several hundred to over 1,000 sheets. Such stacks of printed sheets are pre-cut lengthwise and crosswise, thereby forming a large number of pre-cut stacks of sheets then be isolated. To produce the finished labels, a contour punching knife with a closed contour, also known as a punching iron, is used. The punching is carried out in such a way that the stack to be punched is pressed against the contour punching knife, so that it is pushed into the contour punching knife, resulting in punching waste.

The EP 1 584 432 B1 discloses such a method for contour punching an initial stack of sheet material and a punching device for carrying out the method. The DE 40 130 71 A1 discloses a device for contour punching with a contour punching knife, wherein the device has a punch that can be moved in the direction of the first contour punching knife for pressing an initial stack into the first contour punching knife and the device has a collecting device for collecting the punching waste.

When contour punching an initial stack of sheet material, in particular for the production of labels, the problem is that the label to be punched out often has a shape that deviates from a rectangle, thus a pre-cut cuboid initial stack that is fed to the punching device contains rectangular sheets or sheets has a relatively large unprinted area. In order to obtain a good result from the punched-out label, in particular to avoid unprinted edges on the punched-out label, it is generally necessary to punch out the label in such a way that the contour punching knife penetrates the respective sheet or the initial stack in the area of the printed area the punched out label is printed up to its outer contour. However, this leads to the problem that the punching waste formed during punching has printed areas. The disposal and/or recycling of waste that is printed involves higher costs or greater effort than is the case with waste without printed areas.

Accordingly, it is an object of the present invention to provide a method in which the amount of printed punching waste can be reduced. A further object of the invention is to create a device for carrying out the method according to the invention.

These tasks are achieved by a method that has the features of patent claim 1 and a punching device that has the features of Claim 3 has solved.

• Bereitstellen eines zu stanzenden Ausgangsstapels aus blättrigem Gut, wobei das jeweilige Blatt einen bedruckten Bereich und einen den bedruckten Bereich, vorzugsweise vollständig, umgebenden unbedruckten Bereich aufweist, wobei der bedruckte Bereich des jeweiligen Blatts eine Außenkontur aufweist,
• Bereitstellen eines ersten Konturstanzmessers, auch als Stanzeisen bezeichnet, wobei eine Stanzkontur des ersten Konturstanzmessers größer ist als die Außenkontur des bedruckten Bereichs,
• Pressen bzw. Hineinstoßen des bereitgestellten Ausgangsstapels in das erste Konturstanzmesser zur Bildung eines vorgestanzten Stapels derart, dass das erste Konturstanzmesser ausschließlich in dem unbedruckten Bereich den Ausgangsstapel durchdringt, sodass bei diesem ersten Stanzvorgang gebildeter erster Stanzabfall frei von bedruckten Bereichen ist,
• Sammeln des ersten Stanzabfalls,
• Bereitstellen eines zweiten Konturstanzmessers, wobei eine Stanzkontur des zweiten Konturstanzmessers kleiner ist als die Außenkontur des bedruckten Bereichs oder der Außenkontur des bedruckten Bereichs entspricht,
• Pressen des vorgestanzten Stapels in das zweite Konturstanzmesser zur Bildung eines Nutzenstapels, insbesondere zur Bildung eines Stapels von ausgestanzten Etiketten, derart, dass das zweite Konturstanzmesser im bedruckten Bereich, insbesondere ausschließlich im bedruckten Bereich, durch den vorgestanzten Stapel schneidet, sodass bei diesem zweiten Stanzvorgang gebildeter zweiter Stanzabfall bedruckte Bereiche aufweist,
• Sammeln des zweiten Stanzabfalls, wobei der zweite Stanzabfall getrennt von dem ersten Stanzabfall gesammelt wird.

The method according to the invention for contour punching an initial stack of sheet material, in particular for punching out labels from an initial stack of sheet material, has the following process steps:

• Providing an initial stack of sheet material to be punched, the respective sheet having a printed area and an unprinted area surrounding the printed area, preferably completely, the printed area of the respective sheet having an outer contour,
• Providing a first contour punching knife, also referred to as a punching iron, wherein a punching contour of the first contour punching knife is larger than the outer contour of the printed area,
• Pressing or pushing the initial stack provided into the first contour punching knife to form a pre-punched stack in such a way that the first contour punching knife penetrates the initial stack only in the unprinted area, so that the first punching waste formed in this first punching process is free of printed areas,
• collecting the first punching waste,
• Providing a second contour punching knife, wherein a punching contour of the second contour punching knife is smaller than the outer contour of the printed area or corresponds to the outer contour of the printed area,
• Pressing the pre-punched stack into the second contour punching knife to form a stack of benefits, in particular to form a stack of punched-out labels, such that the second contour punching knife cuts through the pre-punched stack in the printed area, in particular exclusively in the printed area, so that in this second The second punching waste formed by the punching process has printed areas,
• Collecting the second punching waste, the second punching waste being collected separately from the first punching waste.

By providing at least two punching processes, a large proportion of the unprinted area is separated from the printed area in the first punching process and the resulting first punching waste is collected separately, as a result of which the amount of second punching waste formed in the second punching process is much smaller than if only a single punching process would be carried out. By collecting the first punching waste and the second punching waste separately, they can each be sent for suitable disposal or recycling.

The initial stack of leafy material, in particular the respective sheet, preferably has a cuboid shape. The output stack can in particular be a pre-cut output stack, the output stack being pre-cut in such a way that on the respective sheet there is only a single closed printed area per sheet of the pre-cut output stack, in particular a single label print per sheet of the pre-cut output stack . The label print forms the printed area. It is entirely conceivable that the printed area partially extends to the edge of the respective sheet. The label print preferably has larger dimensions than the final label.

It is considered particularly advantageous if the pre-punched stack is pressed into the second contour punching knife by the initial stack acting on the pre-punched stack when the initial stack is pressed into the first contour punching knife. This means it is not necessary to handle the pre-punched stack separately. In particular, it is provided that there are guide structures between the first contour punching knife and the second contour punching knife, these guide structures serving to control the movement of the pre-punched stack when pressing the pre-punched stack in the direction of the second contour punching knife.

The punching device according to the invention is used to carry out the method according to the invention. For this purpose, the punching device has a first contour punching knife with a punching contour, a second contour punching knife with a punching contour and a punch that can be moved in the direction of the first contour punching knife for pressing an initial stack into the first contour punching knife. The dimensions of the punching contour of the first contour punching knife are larger than the dimensions of the punching contour of the second contour punching knife. As the first contour punch knife passes through the initial stack, a pre-punched stack is formed. The device has a first collecting device for collecting the first punching waste formed when the first contour punching knife passes through the initial stack. The second contour punching knife is arranged downstream of the first contour punching knife in the direction of travel of the punching stamp, so that the pre-punched stack is pressed into the second contour punching knife when the punching stamp is moved in the direction of the first contour punching knife. The device has a second collecting device for collecting the second punching waste formed when the second contour punching knife passes through the pre-punched stack. The first collecting device and the second collecting device are not identical, so that the first punching waste and the second punching waste are collected separately from each other.

It is entirely conceivable that the first and second collection devices are components of a common waste collection device, for example the collection devices are formed by different compartments of the waste collection device.

It is considered advantageous if a geometric shape of the punching contour of the first contour punching knife can be converted into a geometric shape of the punching contour of the second contour punching knife by scaling, with a scaling factor being less than 1.

Preferably, both the geometric shape of the punching contour of the first contour punching knife and the geometric shape of the punching contour of the second contour punching knife correspond, at least essentially, to the geometric shape of the outer contour of the printed area.

It is considered particularly advantageous if the contour punching knives are arranged nested one inside the other.

Preferably, both the first contour punching knife and the second contour punching knife are essentially hollow conical. As a result, the second contour punching knife can be arranged within the first contour punching knife.

The punching device has at least one diverting element for diverting the first punching waste into the first collecting device and/or for diverting the second punching waste into the second collecting device.

This diverting element can be, for example, a plate-shaped element, for example in the form of a partition. It is entirely conceivable and preferred for the diverting element to extend between the two contour punching knives in the direction of the collecting devices.

It is considered particularly advantageous if the respective collecting device is arranged below the respective contour punching knife.

It is considered particularly advantageous if the first collecting device and/or the second collecting device is a waste container, in particular a rollable waste container. The waste container is preferably a commercially available garbage can. In particular, the device has waste containers that can be handled separately from one another.

It is considered advantageous if the first contour punching knife and/or the second contour punching knife is mounted in the punching device in a displaceable and/or pivotable manner, in particular if the contour punching knives are mounted in the punching device in a displaceable and/or pivotable manner relative to one another. As a result, the position of the first contour punching knife and/or the second contour punching knife can be changed in a particularly simple manner, in particular in order to achieve an optimal alignment of the respective contour punching knife to the initial stack or the pre-punched stack and/or the punch.

It is considered particularly advantageous if the first contour punching knife and/or the second contour punching knife are mounted in a common bearing structure, the bearing structure being pivotably and/or displaceably mounted in the punching device. This makes it possible to align the first contour punching knife and the second contour punching knife together, in particular to align them with respect to the initial stack. In this context, it is entirely conceivable that the position and orientation of the first contour punching knife relative to the second contour punching knife is unchangeable.

However, it is also entirely conceivable that the first contour punching knife and/or the second contour punching knife is mounted in the bearing structure in a displaceable and/or pivotable manner.

It is considered particularly advantageous if the punching contour of the first contour punching knife and/or the punching contour of the second contour punching knife are designed as a closed contour.

Fig. 1

eine schematische Darstellung einer Ausführungsform einer erfindungs-gemäßen Stanzvorrichtung in einer Seitenansicht,

Fig. 2

die Stanzvorrichtung gemäß Fig. 1 bei Durchführung der Stanzvorgänge,

Fig. 3

ein Blatt eines Ausgangsstapels mit einem aufgedruckten Etikett in einer Draufsicht,

Fig. 4

das Blatt gemäß Fig. 3 mit einer eingezeichneten Stanzkontur eines ersten Stanzmessers,

Fig. 5

ein bei einem zweiten Stanzvorgang entstandener zweiter Stanzabfall,

Fig. 6

eine schematische Darstellung der Stanzkontur des ersten Konturstanzmessers,

Fig. 7

eine schematische Darstellung der Stanzkontur eines zweiten Konturstanzmessers.

In the following figures, the invention is explained in more detail using an exemplary embodiment, without being limited to this. Show it:

Fig. 1

a schematic representation of an embodiment of a punching device according to the invention in a side view,

Fig. 2

the punching device according to Fig. 1 when carrying out the punching processes,

Fig. 3

a sheet of an output stack with a printed label in a top view,

Fig. 4

the sheet according to Fig. 3 with a marked punching contour of a first punching knife,

Fig. 5

a second punching waste created during a second punching process,

Fig. 6

a schematic representation of the punching contour of the first contour punching knife,

Fig. 7

a schematic representation of the punching contour of a second contour punching knife.

The Fig. 1 and 2 show a punching device according to the invention, the punching device having a first contour punching knife 7 with a punching contour 8, a second contour punching knife 9 with a punching contour 10 and a punching punch 15 which can be moved in the travel direction X. The punch 15 can be moved by means of the drive 16. The punch 15 is used to press an initial stack 1 into the first contour punching knife 7.

The initial stack 1 is formed from several sheets stacked one on top of the other and is pre-cut in such a way that it is cuboid and a single label print 20 is printed on the respective sheet. In this respect, the respective sheet or the respective sheet 3 has a printed area 4, namely the label print 20, and an unprinted area 5 surrounding the printed area 4, the printed area 4 having an outer contour 6. The label print 20 has slightly larger dimensions than the final trimmed label 2. In the present case, the label 2 is a label 2 for the neck area of a bottle.

The punching contour 8 of the first contour punching knife 7 and the punching contour 10 of the second contour punching knife 9 can be approximately converted into one another by scaling, the punching contour 8 of the first contour punching knife 7 being slightly larger than the outer contour 6 of the printed area 4 and the punching contour 10 of the second contour punching knife 9 is slightly smaller than the outer contour 6 of the printed area 4. The punching contour 10 of the second contour punching knife 9 corresponds to an outer contour of the final label 2.

During the punching process using the punching device according to Fig. 1 the output stack 1 is moved in the direction of the first contour punching knife 7 by means of the punch 15 and pressed into the contour punching knife 7 in such a way that a pre-punched stack 11 is formed. The first punching waste 12 formed during this punching process is collected in a first collecting device 17, which is arranged below the first contour punching knife 7. During this first punching process, the first contour punching knife 7 penetrates the output stack 1 exclusively in the unprinted area 5 of the output stack 1 or the respective sheet 3, as shown schematically in the Fig. 4 is shown. In this respect, the first punching waste 12 formed during this first punching process is free of printed areas.

The punching device is designed in such a way that the pressing of the pre-punched stack 11 into the second contour punching knife 9 takes place in that the output stack 1 acts on the pre-punched stack 11 by means of the punching stamp 15 when the output stack 1 is pressed into the first contour punching knife 7 and this into the second Contour punching knife 9 presses. When the pre-punched stack 11 is pressed into the second contour punching knife 9, a stack of benefits 13 is formed from finally punched labels 2. The second contour punching knife 9 penetrates the pre-punched stack 11 exclusively in the printed area 4, so that the second punching waste 14 formed during this second punching process has printed areas 4 and unprinted areas 5. As an example, this second punching waste 14 is for a single sheet 3 in the Fig. 5 shown. The Indian Fig. 5 Punching waste 14 shown is ring-shaped with an inner printed area 4 and an unprinted area 5 surrounding the printed area 4 radially on the outside.

The punching device has a second collecting device 18 for collecting the second punching waste 14 formed during the second punching process. In order to avoid that the first punching waste 12 mixes with the second punching waste 14 and to ensure that the punching waste 12, 14 formed is reliably fed to the respective collecting device 17, 18, the punching device has two diverting elements 19, one of which is the diverting elements 19 extends from the first contour punching knife 7 in the direction of adjacent side walls of the collecting devices 17, 18 and the other diverting element 19 extends from the second contour punching knife 9 in the direction of a side wall of the second collecting device 18 opposite the adjacent side wall. This punching device thus ensures that only unprinted first punching waste 12 is collected in the first collecting device 17, which can be disposed of separately from the at least partially printed second punching waste 14, which is collected in the second collecting device 18. Thus, the cost of waste disposal can be reduced, since typically the cost of disposing of printed material is more expensive than disposing of unprinted material. The unprinted material can certainly be resold as a recyclable material. This means that money can be saved overall by separating printed and unprinted waste material.

Reference symbol list

1

Output stack

2

label

3

Sheet

4

printed area

5

unprinted area

6

Outer contour

7

first contour punching knife

8th

Punching contour

9

second contour punching knife

10

Punching contour

11

pre-punched stack

12

first punching waste

13

Utility stack

14

second punch waste

15

punching stamp

16

drive

17

first collection facility

18

second collection facility

19

Dissipation element

20

Label printing

Claims (12)

1. Method for contour punching an output stack (1) consisting of sheet-like material, in particular for punching out labels (2) from an output stack (1) consisting of sheet-like material, characterized in that the method has the following method steps:

   - providing an output stack (1) consisting of sheet-like material to be punched, wherein the respective sheet (3) has a printed region (4) and an unprinted region (5) which encloses the printed region, wherein the printed region (4) has an outer contour (6),

   - providing a first contour punching blade (7), wherein a punching contour (8) of the first contour punching blade (7) is larger than the outer contour (6) of the printed region (4),

   - pressing the provided output stack (1) into the first contour punching blade (7) for forming a pre-punched stack (11), such that the first contour punching blade (7) exclusively penetrates the output stack (1) in the unprinted region (5), so that first punching waste (12) which is formed in this first punching procedure is free of printed regions,

   - collecting the first punching waste (12),

   - providing a second contour punching blade (9), wherein a punching contour (10) of the second contour punching blade (9) is smaller than the outer contour (6) of the printed region (4) or corresponds to the outer contour (6) of the printed region (4),

   - pressing the pre-punched stack (11) into the second contour punching blade (9) for forming a usable stack (13), in particular for forming a stack of punched-out labels (2), such that the second contour punching blade (9) cuts through the pre-punched stack (11) in the printed region (4), in particular exclusively in the printed region (4), so that second punching waste (14) which is formed in this second punching procedure has printed regions (4),

   - collecting the second punching waste (14), wherein the second punching waste (14) is collected separately from the first punching waste (12).
2. Method according to Claim 1, wherein the pre-punched stack (11) is pressed into the second contour punching blade (9) by the output stack (1) acting on the pre-punched stack (11) when the output stack (1) is pressed into the first contour punching blade (7).
3. Punching device for carrying out the method according to Claim 1 or 2, wherein the punching device has a first contour punching blade (7) with a punching contour (8), a second contour punching blade (9) with a punching contour (10), wherein the dimensions of the punching contour (8) of the first contour punching blade (7) are larger than the dimensions of the punching contour (10) of the second contour punching blade (8), wherein the device has a punching die (15) which is movable in the direction of the first contour punching blade (7) for pressing an output stack (1) into the first contour punching blade (7), for forming a pre-punched stack (11) when the first contour punching blade (7) passes through the output stack (11), wherein the device has a first collecting device (17) for collecting the first punching waste (12) which is formed when the first contour punching blade (7) passes through the output stack (1), wherein the second contour punching blade (9) is arranged downstream of the first contour punching blade (7) in the direction of movement (X) of the punching die (15), so that the pre-punched stack (11) is pressed into the second contour punching blade (9) when the punching die (15) is moved in the direction of the first contour punching blade (7), wherein the device has a second collecting device (18) for collecting the second punching waste (14) which is formed when the second contour punching blade (9) passes through the pre-punched stack (11), wherein the first collecting device (17) and the second collecting device (18) are not identical.
4. Device according to Claim 3, wherein a geometric shape of the punching contour (8) of the first contour punching blade (7) is able to be transferred by scaling into a geometric shape of the punching contour (10) of the second contour punching blade (9), wherein a scaling factor is less than 1.
5. Device according to Claim 3 or 4, wherein the punching device has a drive (16) for moving the punching die in the direction of the first contour punching blade (7).
6. Device according to one of Claims 3 to 5, wherein the contour punching blades (7, 9) are arranged so as to be nested in one another.
7. Device according to one of Claims 3 to 6, wherein the punching device has at least one diverting element (19) for diverting the first punching waste (12) into the first collecting device (17) and/or for diverting the second punching waste (12) into the second collecting device (18).
8. Device according to one of Claims 3 to 7, wherein the first collecting device (17) and/or the second collecting device (18) is a waste container, in particular a rollable waste container.
9. Device according to one of Claims 3 to 8, wherein the first contour punching blade (7) and/or the second contour punching blade (9) is displaceably and/or pivotably mounted, in particular the contour punching blades (7, 9) are mounted so as to be displaceable relative to one another and/or pivotable relative to one another.
10. Device according to one of Claims 3 to 9, wherein the first contour punching blade (7) and the second contour punching blade (9) are mounted in a common bearing structure, wherein the bearing structure is pivotably and/or displaceably mounted in the punching device.
11. Device according to Claim 10, wherein the first contour punching blade (7) and/or the second contour punching blade (8) is displaceably and/or pivotably mounted in the bearing structure.
12. Device according to one of Claims 3 to 11, wherein the punching contour (8) of the first contour punching blade (7) and/or the punching contour (10) of the second contour punching blade (9) is configured as a closed contour.

Images