Device for detaching a punched part from a material web comprising several material layers

Abstract

Device (10) for detaching a punched part (12) from a material web (14) comprising several material layers (20, 22, 24) - with a cutting cylinder (32) and a counter cylinder (34) for cutting the punched part (12) from one of the outer layers (22) of the material web (14), - with a transfer roller (40), by means of which a transfer film (42) can be pressed in the area of ​​the transfer roller (40) onto the material layer (22) with the punched parts (12) and then removed again, so that the punched parts (12) can be transferred to the transfer film (42) and removed with the transfer film (42), - with at least one advance unit by means of which the material web (14) can be transported further without the punched-out punched parts (12).

Description

TECHNICAL FIELD

[0001] The invention relates to a device for detaching a punched part from a material web comprising multiple material layers. Such a process may be necessary in web-processing operations, for example, to remove punched parts from an adhesive layer. This may be particularly the case in the production of wound plasters or other therapeutic plasters. STATE OF THE ART

[0002] To punch out sections from a material web, the device known from DE 20 2015 008 522 U1, for example, can be used. The device disclosed therein has a vacuum cutting cylinder and a counter cylinder, by means of which the sections are punched out of the material web and removed directly from it. Furthermore, a vacuum transfer roller is provided, by means of which the sections can be removed from the vacuum cutting cylinder and placed on a conveyor belt.

[0003] EP 3 275 820 A1 discloses a device for cutting a material web into sections, which comprises a cutting unit, a vacuum transfer roller, and at least one advance unit. In this case, the vacuum transfer roller and the advance unit are driven by independent motor drives, allowing the vacuum transfer roller and the material web to move at different speeds relative to each other. This allows different formats to be cut with one and the same vacuum transfer roller, even if the formats would be incompatible based on the vacuum transfer roller's hole pattern.

[0004] Such devices generally work very well when the material web is single-layer and the punched sections are to be subsequently processed. However, with multi-layer material webs, the described devices can cause delamination at the cut edges of the contour. Such delamination always causes deformation of the cut edge and thus a cosmetic defect. If the punched sections are sticky punched parts, this negative effect is further amplified.

[0005] For sticky die-cut parts, a transfer film can be laminated over the entire surface and then removed together with the die-cut parts using a peel-off edge or roller. However, this can also result in uncontrolled detachment of the remaining material from the web. PRESENTATION OF THE INVENTION

[0006] Based on this prior art, the object of the invention is to provide an improved device for detaching a punched part from a material web comprising several material layers, by means of which delamination at the cut edges can be prevented.

[0007] The device according to the invention for detaching a punched part from a material web comprising several material layers is defined by the features of main claim 1. Useful developments of the invention are the subject of further claims following this claim.

[0008] The device according to the invention for detaching a punched part from a material web comprising several material layers has a cutting cylinder and a counter cylinder. By means of the cutting cylinder and the counter cylinder, punched parts can be cut from one of the outer layers of the material web. The punched parts initially remain in the remaining material layer and are not transferred to the cutting cylinder. In addition, there is a transfer roller which is arranged behind the cutting cylinder as seen in the transport direction of the material web. A transfer film can be pressed onto the material layer containing the punched parts via the transfer roller and then removed again. The punched parts are transferred to the transfer film and removed with the transfer film. The remaining material web with the material layer without the punched-out punched parts is transported further by means of a feed unit.

[0009] The transfer film is no longer laminated over a large area onto the material layer containing the die-cut parts and then removed again using a peel-off edge or roller. Instead, the transfer film is simply pressed onto the die-cut parts for a short time and then immediately removed. This allows for particularly gentle and precise removal of the die-cut parts, preventing unwanted delamination of the remaining die-cut edges of the material web.

[0010] Preferably, a peel-off edge or peel-off roller can be arranged upstream of the cutting cylinder, as seen in the transport direction of the material web, by means of which at least an outer material layer can be peeled off the material web. In this way, a material layer that was initially intended to protect the underlying material layer can be removed first before the punched parts are punched out of the then exposed material layer. This can be particularly necessary if the punched parts are to be punched out of a sticky material layer.

[0011] In an advantageous embodiment, the transfer roller can be designed as an eccentric roller. This allows the eccentric roller to press the transfer film onto the material web in the area of ​​the punched parts, enabling precise transfer of the punched parts onto the transfer film. In the area of ​​the material web where no punched parts are present, however, the eccentric roller can be positioned at a certain distance from the material web, ensuring that the transfer film does not touch the material web. This further reduces the risk of delamination at the punched edges.

[0012] Preferably, the transfer roller can be motor-driven so that the transfer roller can also provide the advancement of the transfer film.

[0013] Further advantages and features of the invention can be found in the features further specified in the claims and in the following exemplary embodiment. SHORT DESCRIPTION OF THE DRAWING

[0014] The invention is described and explained in more detail below with reference to the exemplary embodiment shown in the drawing. It shows: Fig. 1 a schematic representation of the device according to the invention for detaching a punched part from a material web comprising several material layers. WAYS TO CARRY OUT THE INVENTION

[0015] The device 10 according to the invention for detaching a punched part 12 from a material web 14 is shown in Fig. 1. In the present example, the material web 14 has a total of three material layers 20, 22, 24. In contrast, the material web 14 could also have more or fewer material layers.

[0016] The material web 14 is fed to the device 10 in the transport direction 16 via transport rollers (not shown here). In the present example, the upper material layer 20 is first separated from the remaining material web 14 by a pull-off roller 30. In the present example, the upper material layer 20 was intended as a protective layer for the adhesive layer 22 located underneath. The punched parts 12 are to be removed from this adhesive layer 22.

[0017] After the material web 14 has passed the peel-off roller 30, the adhesive layer 22, the upper layer of the material web 14, is exposed and can be further processed. Punched parts 12 are created in the adhesive layer 22 and removed from it. This may be necessary, for example, in the production of transdermal patches when only certain areas of the patches are to be adhesive.

[0018] To produce the punched parts 12, the device 10 has a cutting cylinder 32 and a counter cylinder 34 that interacts with the cutting cylinder 32. The cutting cylinder 32 is mounted for rotation about a rotation axis 36 and is moved by a motor drive (not shown here). The outer surface of the cutting cylinder 32 has a plurality of cutting edges 38 that form a plurality of identical recesses. The outer shape of the recesses corresponds to the shape of the punched parts 12 to be cut. When the material web 14 passes between the cutting cylinder 32 and the counter cylinder 34, the punched parts 12 are produced in the adhesive layer 22. The cutting edges 38 are designed such that the punched parts 12 are only produced in the adhesive layer 22 and the lower material layer 24 remains unchanged. The punched parts 12 initially remain in the material web 14 and are not transported away by the cutting cylinder 32.

[0019] A transfer roller 40 is located behind the cutting cylinder 32 and the counter cylinder 34, as viewed in the transport direction 16. The transfer roller 40 is located on the same side of the material web 14 as the cutting cylinder 32, so that the punched parts 12 produced by the cutting cylinder 32 can be removed from the remaining material web 14 by the transfer roller 40. A transfer film 42 runs over the transfer roller 40. The transfer film 42 is pressed by the transfer roller 40 onto the material web 14 in the area of ​​a punched part 12, so that the punched part 12 is transferred to the transfer film 42 and can be transported away with the transfer film 42. The transfer film 42 can then be wound up together with the punched parts 12 and disposed of.

[0020] In the present example, the transfer roller 40 is designed as an eccentric roller 40. The transfer roller 40 is mounted for rotation about a rotational axis 44, with the rotational axis 44 being arranged off-center of the transfer roller 40. Alternatively, it would also be possible to design the transfer roller with recesses or elevations in the area of ​​the outer surface. Furthermore, the transfer roller 40 could also be designed to be movable, so that it could be lowered onto the material web 14 and removed from it again intermittently.

[0021] The material web 14 is transported further in the web plane without the punched parts 12. Only the adhesive segments 46 present between the punched parts 12 remain of the original adhesive layer 22. To protect these adhesive segments 46, in the present example, an additional material layer 26 is laminated onto the adhesive segments 46 and thus the material web 14. This is done via a laminating roller 48, which interacts with a counter roller 50. The new material web 14' can then be transported further using additional transport rollers (not shown here) and, if necessary, fed to further processing stations.

[0022] In contrast to the embodiment shown here, the material layer 22 from which the punched parts 12 are removed does not necessarily have to be an adhesive layer 22. The device 10 according to the invention can also be used for the production and removal of non-adhesive punched parts 12. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 20 2015 008 522 U1

[0002] EP 3 275 820 A1

[0003]

Claims

[1] Device (10) for detaching a punched part (12) from a material web (14) comprising several material layers (20, 22, 24) - with a cutting cylinder (32) and a counter cylinder (34) for cutting the punched part (12) from one of the outer layers (22) of the material web (14), - with a transfer roller (40), by means of which a transfer film (42) can be pressed in the area of ​​the transfer roller (40) onto the material layer (22) with the punched parts (12) and then removed again, so that the punched parts (12) can be transferred to the transfer film (42) and removed with the transfer film (42), - with at least one advance unit by means of which the material web (14) can be transported further without the punched-out punched parts (12). [2] Device according to claim 1, - characterized by , that - a peeling edge or peeling roller (30) is arranged in front of the cutting cylinder (32), by means of which at least one outer material layer (20) can be peeled off the material web (14). [3] Device according to claim 2, - characterized by , that - the outer material layer (22) with the punched parts (12) is designed as an adhesive layer (22). [4] Device according to one of the preceding claims, - characterized by , that - the transfer roller (40) is designed as an eccentric roller (40), - the eccentric roller (40) can be pressed onto the material web (14) in the area of ​​the punched parts (12), - the eccentric roller (40) is present in the area without the punched part (12) at a certain distance from the material web (14). [5] Device according to one of the preceding claims, - characterized by , that - the transfer roller (40) is motor-driven.

Images