CN110355823B

CN110355823B - Method for producing a die-cutting tool

Info

Publication number: CN110355823B
Application number: CN201910240981.XA
Authority: CN
Inventors: P·多莱
Original assignee: Heidelberger Druckmaschinen Intellectual Property AG and Co KG
Current assignee: Heidelberger Druckmaschinen Intellectual Property AG and Co KG
Priority date: 2018-04-11
Filing date: 2019-03-28
Publication date: 2022-09-30
Anticipated expiration: 2039-03-28
Also published as: DE102019203693B4; CN110355823A; DE102019203693A1

Abstract

The invention relates to a method for producing a die-cutting die for a die-cutting cylinder having an array of holes in the circumferential surface thereof, for rotationally cutting printed products, having the following steps: providing a flexible substrate and arranging at least one first die cutter having a closed contour on the substrate in matching relationship with the array of holes to rotationally die cut holes in the area of the active part of the printed product, characterized by the further steps of: at least one second cutting rule having a closed contour is arranged on the substrate in adaptation to the hole array for rotationally cutting further holes in an area outside the active part of the printed matter. The use of a die-cutting die manufactured according to the invention makes it possible in a simple manner to prevent the die-cutting cylinder from becoming unevenly hot when die-cutting is carried out by the die-cutting die and thus to improve the quality of the die-cut finished product.

Description

Method for producing a die-cutting tool

Technical Field

The present invention relates to a method for producing a die-cutting die for a die-cutting cylinder, a method for rotationally die-cutting printed matter, and a method for producing a die-cutting die for a die-cutting cylinder.

The invention is in the technical field of the graphic industry and is used in particular for the further processing of flat substrates, such as paper, cardboard or plastic films, by cyclic die cutting.

Background

Machines for cyclic die cutting are known from the prior art. In the case of a die-cutting method implemented by means of this machine, so-called chips are die-cut from the printing material to be processed. The chips are first held on the surface of the die-cutting dies received on the die-cutting drum by means of suction air and then blown out by means of blowing air. Suction air and blowing air are alternately applied to the rotating die-cutting drum for suction and blowing. The die-cutting drum or its circumferential surface becomes hot due to the passage and openings of the suction air or blowing air moving through the die-cutting drum. If the die-cutting roller heats up unevenly, it can lead to deformations and disturb the die-cut product. The larger the die-cutting cylinder, the greater the negative effect, that is to say, conversely, no corresponding problems arise in the case of small die-cutting cylinders, for example in the context of narrow-format processing. However, the development is moving to larger and larger printed sheet formats and thus also to larger and larger die cylinders, so that the problem of uneven thermal expansion is becoming more acute. The known measure from the prior art is the water cooling of the die-cutting cylinder. However, this measure involves a high cost.

Disclosure of Invention

The object of the present invention is therefore to provide an improved technical solution in relation to the prior art, which in particular makes it possible to prevent the die-cutting cylinder from heating up unevenly when die-cutting is carried out with the aid of a die-cutting die.

This object is achieved according to the invention by a method having the features of the invention and by a method having the features of the invention. Advantageous and therefore preferred further embodiments of the invention emerge from the description and the drawings. The features of the invention, further aspects of the invention and embodiments of the invention are also advantageous further aspects of the invention in combination with one another.

According to the invention, a method for producing a die-cutting tool for a die-cutting cylinder having an array of holes in the circumferential surface thereof for rotationally cutting printed products comprises the following steps: providing a flexible substrate and arranging at least one first die cutter having a closed contour on the substrate in matching relationship with the array of holes to rotationally die cut holes in the area of the active part of the printed product, characterized by the further steps of: at least one second cutting rule having a closed contour is arranged on the substrate in adaptation to the hole array for rotationally cutting further holes in an area outside the active part of the printed matter.

The invention advantageously achieves that the die-cutting cylinder is prevented from becoming unevenly hot when die-cutting by means of the die-cutting die. For this purpose, a die-cutting tool is produced according to the invention.

The invention improves the stability of the die-cutting drum and also the operating capacity and stability of the die-cutting tool or the cutting blade thereof received on the die-cutting drum. In addition, rotation errors of the die-cutting drum are avoided.

According to the invention, at least one second cutting rule having a closed contour is provided. The at least one second die cutter is for rotationally cutting additional holes. The further holes are located in a region outside the active part of the printed matter, in particular outside all active parts of the printed matter.

By providing an additional second die cutter with a closed contour (or suction and/or blowing openings in the inner region of the contour), it is possible to move air through the die-cutting die and through the contour during suction and blowing. This also results in heating of the circumferential surface of the die-cutting cylinder occurring as a result of said air movement in the region outside the active part of the printed product. In this way, it is advantageously achieved that the circumferential surface of the die-cutting drum is prevented from becoming unevenly hot or that the requirements for uniformly heating the circumferential surface of the die-cutting drum are created.

Furthermore, the invention relates to the use of the die-cutting die produced according to the invention. In this respect, a further method according to the invention is a method for rotationally die-cutting printed products, having the following steps: arranging a die cutting die manufactured according to the present invention on a circumferential surface of a die cutting drum; rotating the die-cutting cylinder and thereby rotationally die-cutting holes in the printed product; and alternately applying suction air and blowing air to the rotating die-cutting drum.

By using the die-cutting die produced according to the invention in a method for cyclic die-cutting, the aforementioned problems of uneven thermal expansion of the die-cutting cylinder can be avoided in an advantageous manner.

Furthermore, the invention relates to a method for producing a die-cutting die for a die-cutting cylinder having an array of holes in its circumferential surface, for rotationally cutting printed matter, having the following steps: providing a flexible substrate and arranging at least one first die cutter having a closed contour on the substrate in match with the hole array for rotationally die cutting holes in the area of the active part of the printed product, characterized by the following steps: at least one hole is arranged on the substrate in a matching manner to the hole array in an area outside the active part of the print or in an area of the active part of the print.

The invention advantageously achieves that the die-cutting cylinder is prevented from heating up unevenly when die-cutting is carried out with the die-cutting die. For this purpose, a die-cutting tool is produced according to the invention.

By providing at least one additional opening without a surrounding cutting die, i.e. additional suction and/or blowing openings, it is possible to move air through the die cutting die during suction and blowing. This also results in heating of the circumferential surface of the die-cutting cylinder occurring as a result of said air movement in the region outside the active part of the printed product. In this way, it is advantageously achieved that the circumferential surface of the die-cutting drum is prevented from becoming unevenly hot or that the requirements for uniformly heating the circumferential surface of the die-cutting drum are created.

Preferred further aspects of the invention may be shown as follows:

the arrangement or manufacture of the first cutting rule and the arrangement of the second cutting rule may preferably be carried out by etching. Additionally, the die-cutting rule thus produced can be ground subsequently. Subsequent laser quenching is advantageous.

The second die cutter may preferably be manufactured with a circular profile. Alternative profiles are for example oval, square or rectangular.

The second die cutter can preferably be produced with a circular contour, wherein the diameter of the circular contour is preferably selected between 5 and 15 mm.

Drawings

The invention and its preferred further aspects are explained in detail below with reference to the drawings, i.e. fig. 1 to 6, according to a preferred embodiment. Features which correspond to one another are provided with the same reference numerals here. Fig. 1 to 6 show views of a preferred embodiment of the technical solution according to the invention.

Detailed Description

Fig. 1 shows a circular die cutter 1 (for example, the machine "XL 106-DD" from the company hexidelberg printing machine) or a machine for rotationally cutting printed products 2, preferably sheets of paper, cardboard or plastic film. The printed products are located as a continuous stack 3 in a continuous feeder 4 of the machine and are placed in a receiving stack 6 in a receiving device 7 of the machine after die cutting into die-cut printed products 5.

The machine 1 comprises two endless die cutting means 8 and 9. The first die-cutting means 8 comprise a first die-cutting cylinder 8a, a first counter-pressure cylinder 8b corresponding to said first die-cutting cylinder and means 8c for sucking out die-cutting waste (so-called "chips"). The machine also comprises a second die-cutting device 9 having a second die-cutting cylinder 9a and a second counter-pressure cylinder 9b corresponding to the second die-cutting cylinder. The machine also preferably comprises a conveyor belt (not shown), a transport drum and a chain conveyor for the sheets to be processed.

The first die-cutting cylinder 8a is preferably designed as a so-called magnetic cylinder, i.e. it holds the die-cutting tools applied to it by means of magnetic forces or by means of magnets, in particular powerful magnets, arranged on the cylinder.

The (unrolled) circumferential surface 10 of the first die-cutting cylinder 8a is schematically shown in fig. 2. The circumferential surface has an array of holes 11 made up of a plurality of holes 12. The array of apertures is preferably an array having a dimension of 10 x 20mm (in the lateral direction or in the circumferential direction). The holes 12 are configured as suction holes and/or blowing holes. The diameter of the holes on the surface of the circumferential surface is preferably about 3 mm.

The first die-cutting cylinder 8a has rotary joints on the end faces for sucking air and blowing air. In a first rotation angle range α (see fig. 1) of the first die-cutting cylinder, the holes 12 are connected to the first section of the rotary joint and the suction air is applied to the holes. Thereby, the die-cut chips are sucked and held. In a second angle of rotation range β (see also fig. 1), the bore 12 is connected to the second section of the rotary joint and the bore is supplied with blowing air. The die-cut pieces are thereby blown out and removed from the machine 1 by means of the suction device 8c, for example into a collection container.

As a result of the continuous alternating suction and blowing through the openings 12 during rotation of the drum 8a, the drum, at least its circumferential surface 10, heats up and thus leads to undesirable thermal expansion of the drum (because of disturbing influences on the finished die cut product).

Fig. 3 shows a die-cutting tool 13 (second die-cutting tool), in particular a die-cutting plate, which is received on the second die-cutting cylinder 9 b. The die-cutting die has a die-cutting rule 14 which die-cuts the outline of the active portion 15 (see fig. 5). It can be seen that active portions having different profiles can be die cut. The cutting rule 14 is preferably a closed cutting rule or has a preferably closed contour, which in particular corresponds to the contour of the active part to be die-cut. However, the closed contour is preferably designed such that a tab remains in the printed product 2, which tab secures the active part until the subsequent disposal.

Fig. 4 shows a die-cutting tool 16 (first die-cutting tool), in particular a die-cutting plate. The die-cutting die is a die-cutting die manufactured according to the present invention. The die cut 16 includes a flexible substrate 16a, preferably constructed of an etchable metal.

The die cutting die 16 further includes a cutting rule 17. The die cutter has a closed profile such that holes 18 (see fig. 5) or corresponding chips can be die cut. The holes may be circular, oval or angular. The closed contour is preferably designed such that no tabs remain in the printed product 2, i.e. there is no need to discard before the debris is sucked out. Preferably, the die cutters 17 are circular and have a diameter between 5 and 15 mm.

In fig. 5, a print 2 is shown which is cyclically die cut. The active portion 15 can be seen, which is held by a tab (not shown). The active portion 15a has an aperture 18a which may be required, for example, in the case of a subsequent production of an "in-mold" container from the active portion 15 a. The hole 18a is thus essentially used for further machining of the active portion 15 a. The holes 18a are thus each arranged in the region 19 of the respective active portion 15 a. The suction or blowing through the holes results (as described above) in a local heating of the circumferential surface 10 in the region 20 (see fig. 2). The hole 18a is created by the first cutting rule 17a of the first die-cutting die 16 (see fig. 4).

Fig. 5 also shows the active portion 15b, which has no holes in the area 21 of the active portion 15 b. Due to the absence of this hole (in the case of using a die-cutting die according to the prior art), the local heating in the area 22 (see fig. 2) of the peripheral surface 10 of the first die-cutting cylinder 8a is smaller than the heating in the area 20. As a result, an interfering, non-uniform thermal expansion of the drum (in the case of the use of die-cutting dies according to the prior art) results.

For this reason, the die-cutting die 16 manufactured according to the present invention preferably has an additional cutting rule 17b (second cutting rule). The second die-cutting rule 17b has a closed contour (preferably circular, alternatively oval or rectangular) and is used to die-cut out the chips, which are sucked out. The second cutting rule 17b is not required for further processing of the active part 15 and is therefore also not provided in the prior art. According to the invention, the second cutting rule 17b is provided in order to heat the first cutting cylinder 8a in the region 22, so that it heats up uniformly and expands without interference, in particular without deformation. The second cutting rule 17b is arranged according to the invention in the region 23 outside the active part 15, where holes are normally not cut in the prior art. The die-cutting dies 16 produced according to the invention preferably have the cutting knives 17 distributed almost uniformly over the surface of the first die-cutting die. At least one inner bore of the cutting die 16, which inner bore effects the entry and exit of air through the cutting die and thus the movement of air, is located inside the closed contour of the second cutting rule 17 b. Alternatively, instead of the additional cutting rule 17b including its respective inner bore, only additional bores (i.e. bores which are not surrounded by a cutting rule) can be provided in the die-cutting tool 16 in the region 23 outside the active part 15 or in the region of the respective active part 15.

Finally, fig. 6 shows the sequence of the steps of the method according to the invention.

The method comprises the following steps: a flexible substrate 16a is provided. The substrate is preferably composed of an etchable metal and has a thickness of preferably between 0.8 and 1 mm.

The method comprises the following steps: the first cutting rule 17a is disposed on the substrate. As can be seen with reference to fig. 2 and 3, the arrangement is such that the position of the first cutting rule 17a (or of the suction and/or blowing openings of the die-cutting die surrounded by said first cutting rule) matches the position of the openings 12 of the opening array 11. This ensures that the holes 12 are located below the chips that are die-cut and that the chips can be held in suction and subsequently blown out. The arrangement is preferably achieved in a known manner by etching the flexible substrate 16 a. In this case, the non-die-cut regions in the substrate are etched away and the (previously covered) die-cutting rule remains protruding. The first die cutter is preferably circular and has a diameter of between 5 and 15 mm.

The method comprises the following steps: the second cutting rule 17b is disposed on the substrate. Referring again to fig. 2 and 3, it can be seen that the second cutting rule 17B (for the same reason as described above under method step B) is also arranged such that the position of the second cutting rule 17B matches the position of the holes 12 of the hole array 11. As can be seen with reference to fig. 2 and 3, the arrangement is such that the position of the second cutting rule 17b (or of the corresponding inner bore of the cutting die, i.e. the suction and/or blowing bores surrounded by the cutting rule) matches the position of the bores 12 of the bore array 11. This ensures that the holes 12 are located below the chips that are die-cut and that the chips can be held in suction and subsequently blown out. The arrangement is preferably achieved in a known manner by etching the flexible substrate 16 a. In this case, the non-die-cut regions in the substrate are etched away and the (previously covered) die-cutting rule remains protruding. The second die cutter is preferably circular and has a diameter of between 5 and 15 mm. Alternatively, instead of the additional cutting rule 17b including its corresponding inner bore, it may be provided that only the additional bore 17b is arranged in the die-cutting tool 16 by etching in the region 23 outside the active part 15.

Optional method step D: the die-cutting die 16 produced according to the invention is placed on the die-cutting cylinder 8a and is preferably held magnetically.

Optional method step E: the rotary die cutting is performed using the die cutting die 16 manufactured according to the present invention.

Optional method step F: suction and blowing are continuously alternated through the array of holes 11.

List of reference numerals

1 circulation die cutting machine

2 printed matter

3 continuous material stacking

4 material feeder

5 die-cut printed matter

6 receive material and pile

7 material collector

8 first die cutting device

8a first die-cutting cylinder

8b first counter-pressure roller

8c suction device

9 second die cutting device

9a second die-cutting cylinder

9b second counter-pressure roller

10 peripheral surface of first die-cutting drum

11 well array

12 holes (suction hole and/or blowing hole)

13 die cutting die

14 die-cutting rule

15 effective part

15a, b effective part

16 first die cutting die

16a substrate

17 die-cutting rule

17a first die-cutting rule of first die-cutting die

17b second cutting rule/hole of first cutting die

18 holes/windows

18a hole/window

18b additional holes/windows

19 region of the effective part

20 area

21 region of the effective part

22 region

23 area outside the active part

Alpha first rotation angle range

Beta second angle of rotation

A providing

B arrangement of the first die-cutting rule

C arrangement of second die-cutting rule

D: placing

E: rotary die cutting

F: suction/blowing.

Claims

1. A method for manufacturing a die-cutting die (16) for a die-cutting cylinder (8a) having an array of holes (11) in its circumferential surface (10) for rotationally cutting printed products (2), the method having the steps of:

providing (A) a flexible substrate (16a), and

arranging (B) at least one first die cutter (17a) having a closed contour in correspondence with the array of holes on the substrate to die cut holes (18a) rotationally in the area of an active portion (15a) of the printed matter,

characterized by the additional steps of:

arranging (C) at least one second cutting rule (17b) having a closed contour in correspondence with said array of holes (11) on said substrate (16a) to rotationally mold a further hole (18b) in a zone (23) outside the active portion (15) of said printed product (2).

2. The method according to claim 1, characterized in that the arrangement (B) of the first cutting rule (17a) and the arrangement (C) of the second cutting rule (17B) are carried out by etching.

3. The method according to claim 1 or 2, characterized in that the second die cutter (17b) is manufactured with a circular contour.

4. A method according to claim 3, characterized in that the second die cutter (17b) is manufactured with a circular profile and with a diameter between 5 and 15 mm.

5. A method for rotationally die-cutting printed products (2), having the steps of:

-arranging (D) a die-cutting die (16) manufactured according to any one of claims 1 to 4 on the peripheral surface (10) of a die-cutting drum (8 a);

-rotating the die-cutting cylinder (8a) and die-cutting (E) holes (18a, 18b) in the printed matter (2) in rotation; and

suction air and blowing air are alternately applied (F) to the rotating die-cutting drum (8 a).

6. A method for manufacturing a die-cutting die (16) for a die-cutting cylinder (8a) having an array of holes (11) in its circumferential surface (10) for rotationally cutting printed products (2), the method having the steps of:

providing (A) a flexible substrate (16a), and

characterized by the additional steps of:

at least one hole (17b) is arranged (C) on the substrate (16a) in a region (23) outside the active part (15) of the printed matter (2) or in a region (19) of the active part (15) of the printed matter (2) in a manner that matches the hole array (11).