Method for producing a recess in a packaging part made of a leaf material of a plant

Abstract

The present invention relates to a method for producing a recess in a packaging part made of a leaf material of a plant, comprising the following steps: providing a three-dimensionally shaped packaging part (1) made of a leaf material of a plant; providing a negative mold (2) for the inner surface of the packaging part (1), the negative mold (2) having an opening (6); placing the packaging part (1) onto the negative mold (2) in such a way that the inner surface of the packaging part (1) comes to rest on the outer surface of the negative mold (2) and the packaging part (1) is held on the negative mold (2) using a punch (7) which presses the packaging part (1) onto the negative mold (2), the packaging part (1) covering the opening (6) of the negative mold (2); and moving a cutting tool (3) from outside the packaging part (1) through the leaf material of the packaging part (1) into the opening (6) of the negative mold (2) such that a recess (11) is produced in the packaging part (1), the negative mold (2) supporting the packaging part (1) in the process. The invention further relates to a three-dimensionally shaped packaging part (1) and to packaging for an article.

Description

[0001] Method for producing a recess in a packaging part from a leaf material of a plant

[0002] The invention relates to a method for producing a recess in a packaging part from a leaf material of a plant, a three-dimensionally shaped packaging part and a packaging for an article.

[0003] background

[0004] For packaging, items such as food can be placed in a container, such as a tray, a folding box, or a carton, with the container being sealed with a lid after the item has been inserted. Various packaging materials for food are known (see, for example, DE 10 2011 015 331 A1).

[0005] In order to enable improved fixation of the packaging lid to the packaging base and to support safe transport of the packaged article, fastening means are regularly provided on the container and the lid, for example recesses and projections engaging in these recesses.

[0006] Depending on the shape and material of the workpiece, various techniques for producing recesses can be used. Document DE 4343 241 A1 describes a method for punching two off-center holes in a pipe wall using a punch. Document DE 1 866 721 U relates to a device for punching or perforating hollow bodies, using a hollow mandrel that is mounted in a side arm of a machine body, height-adjustable at one end and secured against rotation. Document WO 2019 / 076 575 discloses a method for punching hollow bodies, wherein the punching area is stiffened or supported from the inside.

[0007] Furthermore, document DE 10 2012 014 096 B3 describes a method for producing slots in a pipe wall using a plurality of punches arranged in a row, which are pierced through the pipe wall, with internal support of the pipe being provided. Document EP 3 547 415 B1 relates to a 3D pattern punch for a lithium metal electrode, in which a 3D pattern made of a polymer material is attached to a die that punches a lithium metal electrode into individual electrodes. Document DE 2 907 414 discloses a device for applying sheet metal through-holes for female threads in hollow profiles. Summary

[0008] The object of the invention is to provide a method for processing a packaging part made of a leaf material of a plant, in which a permanent recess can be produced in the leaf material in an improved manner.

[0009] The object is achieved by means of the method for producing a recess in a packaging part from a leaf material of a plant according to claim 1. Furthermore, a packaging part and a packaging for an article are provided. Further embodiments are the subject of dependent subclaims.

[0010] According to one aspect, a method for producing a recess in a packaging part from a leaf material of a plant is provided, which method comprises the following steps: providing a three-dimensionally shaped packaging part from a leaf material of a plant; providing a negative mold to / (with respect to) the (entire) inner surface of the packaging part, wherein the negative mold has a recess; placing the packaging part on the negative mold such that the inner surface of the packaging part comes to rest on the outer surface of the negative mold and the packaging part is held on the negative mold using a stamp which presses the packaging part onto the negative mold, wherein the packaging part covers the recess of the negative mold;and displacing a cutting tool from outside the packaging part through the sheet material of the packaging part into the recess of the negative mold, so that a recess is produced in the packaging part, wherein the negative mold supports the packaging part in this process;

[0011] According to a further aspect, a three-dimensionally shaped packaging part made of a leaf material of a plant with a recess is provided, which was produced according to the method.

[0012] According to a further aspect, a packaging for an article is provided, comprising the packaging part produced according to the method, wherein the packaging part is configured to receive an article to be packaged, and a packaging lid which is fixed in its relative position to the packaging part by means of a fastening means that interacts with the recess. In the method, a negative mold of the packaging part to be punched is used as a matrix in interaction with the punch to support the article against the punching tool and at the same time to hold the packaging part. By forming a negative mold, which reproduces the shape (of the inner surface) of the packaging part and distributes acting forces evenly over the entire packaging part, a splinter-free production of the recess in the sheet material can be enabled.The method can thus allow the production of a packaging part from leaf material of a plant, in which splintering in the leaf material, in particular around the recess, can be avoided or significantly reduced.

[0013] The leaf material can be a palm leaf material, for example, a cut-out of a palm leaf. The palm leaf material can be an areca palm leaf material.

[0014] The sheet material can be a pressed sheet material. For example, the packaging part can be manufactured by molding in a mold using pressure and elevated temperature.

[0015] The leaf material can be made from a single leaf or a plurality of leaves, in particular palm leaf(s). The packaging part can be molded in one piece.

[0016] The negative mold can be formed with a metal, preferably aluminum. The negative mold can consist (essentially) of the metal, preferably aluminum.

[0017] In general, the negative mold can be formed with or consist of a material with a modulus of elasticity of at least 10, preferably of at least 70 (at 20 °C).

[0018] The negative mold can be formed in one piece. The negative mold can also be arranged on a base, which can in particular be connected in one piece to the negative mold. The base can form a stop for the packaging part when it is placed on it.

[0019] The negative mold and the (entire) inner surface of the packaging part can be formed to fit each other precisely. The packaging part can rest on the negative mold (after placement) in a form-fitting manner. In other words, the packaging part can rest on the negative mold in such a way that, due to the precise fit of the inner surface of the packaging part and the negative mold, relative movement is (essentially) blocked.

[0020] The stamp can be pressed onto an outer bottom surface of the packaging part in such a way that an inner surface of the packaging part is pressed onto a corresponding counter surface of the negative mold. The counter surface can comprise a top surface of the negative mold and / or side surface(s) of the negative mold.

[0021] The bottom surface of the packaging part can be quadrangular (in particular rectangular or square). Additionally or alternatively, the negative mold can have a quadrangular (in particular rectangular or square) top surface.

[0022] The bottom surface of the packaging part can also be oval, round, or polygonal. The negative mold can have an oval, round, or polygonal top surface.

[0023] An opening of the packaging part (for inserting an article to be packaged) can span an area that is at least as large as, in particular larger than, an internal bottom surface of the packaging part.

[0024] For example, the opening of the packaging part can span an area that is at least 5% larger, preferably at least 10% larger, particularly preferably at least 15% larger than the inside bottom area of ​​the packaging part.

[0025] The opening of the packaging part can span an oval, round or polygonal (in particular quadrangular, especially square or rectangular) surface.

[0026] The packaging part and / or the negative mold can each be (essentially) cube-shaped, cuboid-shaped, prism-shaped, pyramid-shaped, truncated pyramid-shaped, conical, truncated cone-shaped, cylindrical, or generally cylindrical (as a general cylinder). In the case of a general cylinder, a cylinder base surface can be non-circular or non-elliptical. For example, the cylinder base surface can be partially curved inward (concave).

[0027] The negative mold may have a (substantially) convex shape. Furthermore, the packaging part may have an outwardly projecting packaging part edge formed on one or more packaging part side walls.

[0028] Furthermore, an inwardly raised projection surface can be formed in the packaging lid base (and preferably a corresponding recessed surface on the cover surface of the negative mold).

[0029] The packaging part can, for example, be a container from the following group: tray, plate, cup and bowl.

[0030] The stamp can press onto the packaging part in a direction parallel to a (point) symmetry axis or a (mirror) symmetry plane of the packaging part (and / or the negative mold). In particular, the stamp can press perpendicularly onto the bottom of the packaging part or the outer bottom surface. Alternatively, other angles can be provided. A stamp surface can be aligned parallel to the bottom of the packaging part when the stamp is pressed onto the packaging part.

[0031] The cutting tool can be moved in a direction perpendicular, parallel or diagonal to a (point) symmetry axis or a (mirror) symmetry plane of the packaging part (and / or the negative mold).

[0032] The cutting tool can be moved in a direction perpendicular to the side wall of the packaging part. Alternatively, it can also be moved diagonally to the side wall of the packaging part.

[0033] The cutting tool can be shaped to fit precisely into the recess. The cutting tool can comprise one or more of a blade, a hollow mandrel, a solid mandrel, or a wedge.

[0034] The recess can be formed in the side surface / one of the side surfaces of the negative mold. The recess can have a polygonal, quadrangular, quadrangular with rounded corners, rectangular, square, oval, or circular opening surface. The recess can be formed as a continuous recess or comprise several (spaced-apart) partial recesses. Accordingly, the cutting tool can be formed in one or more parts.

[0035] The recess can be made at a distance from an edge of the packaging part. Alternatively, the recess can be made as a cutout at the edge of the packaging part. The recess can be made continuous (through the packaging part).

[0036] The recess may be made in a (substantially) flat portion of the packaging part.

[0037] The cutting tool can be moved using a pneumatic press. This allows for rapid movement of the cutting tool thanks to the higher possible flow velocity of the compressed air used. Furthermore, the use of compressed air enables a clean manufacturing process, which can be particularly advantageous for food packaging.

[0038] Alternatively, the cutting tool can be moved using a hydraulic press.

[0039] Furthermore, the stamp can be pressed onto the packaging part using another pneumatic press or another hydraulic press.

[0040] The method may include moving the cutting tool out of the recess. The method may further include rotating the cutting tool and the packaging part (including the negative mold and optionally the stamp) relative to each other, for example, rotating the cutting tool (and / or the negative mold including the packaging part and optionally the stamp). Furthermore, the method may include moving the cutting tool through the sheet material of the packaging part into the (same) recess of the negative mold, so that a further recess is created in the packaging part. Description of exemplary embodiments

[0041] Further embodiments are explained in more detail below with reference to the drawings. Here:

[0042] Fig. 1 is a schematic representation for producing a recess in a packaging part,

[0043] Fig. 2 is a schematic representation of a packaging part and

[0044] Fig. 3 is a schematic representation of packaging for an article.

[0045] Fig. 1 shows a schematic representation for producing a recess 11 in a packaging part 1. A three-dimensionally shaped packaging part 1 made of a leaf material of a plant and a negative mold 2 of the inner surface of the packaging part 1 on a base 5 are provided.

[0046] The negative mold has a recess 6 at a location where a cutout 11 is to be created in the packaging part 1. The packaging part 1 is placed on the negative mold such that the inner surface of the packaging part 1 rests on the outer surface of the negative mold 2, and the packaging part 1 is held in a form-fitting manner on the negative mold 2 by means of a stamp 7, which presses the packaging part 1 onto the negative mold 2. At the same time, the packaging part 1 is supported by the negative mold 2. In particular, the stamp 7 is pressed onto an outer bottom surface 8 of the packaging part 1 such that an inner surface of the packaging part 1 is pressed onto a corresponding counter surface 9 of the negative mold 2.By enlarging the area of ​​the opening 10 of the packaging part 1 compared to the bottom area of ​​the packaging part 1 (and correspondingly shaping the negative mold 2), the placement can be simplified and the hold of the packaging part 1 on the negative mold 2 can be improved.

[0047] To produce the recess 11 in the packaging part 1, a cutting tool 3 is moved through the sheet material of the packaging part 1 into the recess 6 of the negative mold 2 by means of a pneumatic press 4. Alternatively, the cutting tool 3 can also be moved by means of a hydraulic press.

[0048] Fig. 2 shows a schematic representation of a packaging part 1, which has recesses 11 produced by means of the method, as well as a packaging part edge 12, which is formed on a packaging part side wall 13, and a packaging part bottom 14.

[0049] Fig. 3 shows a schematic representation of a package for an article, which package comprises the package part 1 and further comprises a package lid 15. The package lid 15 is fixed in its relative position to the package part 1 by means of a fastening means (for example, a projection on the package lid 15) that interacts with the recess 11. The package lid 15 can be made, for example, from paper, a cardboard material, or even a leaf material (of a plant). Alternatively, a different material can also be provided for the package lid 15.

[0050] The features disclosed in the above description, the claims and the drawings may be important for the realization of the various embodiments both individually and in any combination.

[0051] List of reference symbols

[0052] 1 packaging part

[0053] 2 Negative 3 Cutting tool

[0054] 4 pneumatic press

[0055] 5 Base

[0056] 6 recess

[0057] 7 Stamp 8 outside floor area

[0058] 9 Counter surface

[0059] 10 Opening the packaging part

[0060] 11 Recess

[0061] 12 Packaging part edge 13 Packaging part side wall

[0062] 14 Packaging part base

[0063] 15 packaging lids

Claims

Claims 1. A method for producing a recess in a packaging part from a leaf material of a plant, comprising the following steps: - Providing a three-dimensionally shaped packaging part (1) made of a leaf material of a plant; - providing a negative mold (2) to the inner surface of the packaging part (1), wherein the negative mold (2) has a recess (6); - placing the packaging part (1) on the negative mold (2) in such a way that the inner surface of the packaging part (1) comes to rest on the outer surface of the negative mold (2) and the packaging part (1) is held on the negative mold (2) using a stamp (7) which presses the packaging part (1) onto the negative mold (2), wherein the packaging part (1) covers the recess (6) of the negative mold (2); and - displacing a cutting tool (3) from outside the packaging part (1) through the sheet material of the packaging part (1) into the recess (6) of the negative mold (2), so that a recess (11) is produced in the packaging part (1), wherein the negative mold (2) supports the packaging part (1) in this process.

2. The method according to claim 1, wherein the leaf material is a palm leaf material.

3. Method according to claim 1 or 2, wherein the negative mold (2) is formed with a metal.

4. Method according to at least one of the preceding claims, wherein the negative mold (2) is formed in one piece.

5. Method according to at least one of the preceding claims, wherein the packaging part (1) rests positively on the negative mold (2).

6. Method according to at least one of the preceding claims, wherein the stamp (7) is pressed onto an outer bottom surface (8) of the packaging part (1) in such a way that an inner surface of the packaging part (1) is pressed onto a corresponding counter surface (9) of the negative mold (2).

7. The method according to claim 6, wherein the bottom surface of the packaging part (1) is quadrangular and the negative mold (2) has a quadrangular top surface.

8. Method according to at least one of the preceding claims, wherein an opening (10) of the packaging part (1) spans an area which is at least as large as an inner bottom surface of the packaging part (1).

9. Method according to at least one of the preceding claims, wherein the packaging part (1) and the negative mold (2) are each cube-shaped, cuboid-shaped, prism-shaped, pyramid-shaped, truncated pyramid-shaped, conical, truncated cone-shaped, cylindrical or generally cylindrical.

10. Method according to at least one of the preceding claims, wherein the stamp (7) presses on the packaging part (1) in a direction parallel to an axis of symmetry or a plane of symmetry of the packaging part (1).

11. Method according to at least one of the preceding claims, wherein the cutting tool (3) has a blade which is shaped in such a way that it can be displaced with a precise fit into the recess (6).

12. Method according to at least one of the preceding claims, wherein the recess (11) is produced at a distance from an edge of the packaging part (1).

13. Method according to at least one of the preceding claims, wherein the displacement of the cutting tool (3) is carried out by means of a pneumatic press (4) or a hydraulic press.

14. A three-dimensionally shaped packaging part (1) made of a leaf material of a plant with a recess (11), produced according to a method according to one of claims 1 to 13.

15. Packaging for an article comprising - the packaging part (1) according to claim 14, wherein the packaging part (1) is arranged to receive an article to be packaged; and - a packaging lid (15), wherein the packaging lid is fixed in its relative position to the packaging part (1) by means of a fastening means which cooperates with the recess (11).

Images