CA2201016A1 - Method for adjusting cutting dies, compensating sheet used to this end and die cutting machine equipped with such a compensating sheet - Google Patents

Method for adjusting cutting dies, compensating sheet used to this end and die cutting machine equipped with such a compensating sheet

Info

Publication number
CA2201016A1
CA2201016A1 CA002201016A CA2201016A CA2201016A1 CA 2201016 A1 CA2201016 A1 CA 2201016A1 CA 002201016 A CA002201016 A CA 002201016A CA 2201016 A CA2201016 A CA 2201016A CA 2201016 A1 CA2201016 A1 CA 2201016A1
Authority
CA
Canada
Prior art keywords
cutting
compensating sheet
dies
cutting dies
compensating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA002201016A
Other languages
French (fr)
Inventor
Petrus Van Oosterhout
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PERIVO BV
Original Assignee
PERIVO B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by PERIVO B.V. filed Critical PERIVO B.V.
Publication of CA2201016A1 publication Critical patent/CA2201016A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26FPERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38Cutting-out; Stamping-out
    • B26F1/44Cutters therefor; Dies therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26FPERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38Cutting-out; Stamping-out
    • B26F1/40Cutting-out; Stamping-out using a press, e.g. of the ram type
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26FPERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38Cutting-out; Stamping-out
    • B26F1/44Cutters therefor; Dies therefor
    • B26F2001/4409Cutters therefor; Dies therefor having die balancing or compensating means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26FPERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38Cutting-out; Stamping-out
    • B26F1/44Cutters therefor; Dies therefor
    • B26F2001/4463Methods and devices for rule setting, fixation, preparing cutting dies

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

Method for adjusting cutting dies, in particular in a die cutting machine equipped with several simultaneously operated cutting dies (3A-3B), whereby the differences in height of the cutting dies are offset by means of a compensating sheet (13) made of a compressible material working in conjunction with the cutting dies (3A-3B), characterized in that a sheet made of polycarbonate or a material on the basis of polycarbonate is used as a compensating sheet (13).

Description

~ I (J i~J

Method for adjusting cutting dies, compensating sheet used to this end and die cutting machine equipped with such a compensating sheet.

The present invention concerns a method for adjusting cutting dies, in particular in a die cutting machine equipped with several simultaneously operated cutting dies, a compensating sheet used to this end, as well as a die cutting machine equipped with such a compensating sheet.

I~ the first place, the invention is designed to be applied for the die cutting of paper and/or boxboard, for example to form cartons, such as folding cartons and such, out of a sheet or roll of cardboard or corrugated board, or for the die- cutting of any other material which can be processed on bending/die cutting machines and similar cutting machines.

It is known that for the die cutting of cardboard, use is made of a cutting forme in which several cutting dies and/or bending, scoring or embossing formes are provided, as well as a metal cutting plate provided against the backsides of the cutting dies and the cutting forme and which can be moved by means of a press-on system. During the die cutting, the cutting dies go through the cardboard, after which they make contact with a typically hard, usually metal base. It is hereby of primary importance that all the cutting edges of the cutting dies make contact with the base at the end of the die- cutting movement. Otherwise, a number of cuts will be 220 ' ~1 G

incomplete.

Due to inaccuracies and/or wear and tear of the cutting dies and due to tolerances, deviations and/or wear of the parts of the die cutting machine concerned, the above-mentioned demand will in fact be hardly or never met right away, at least when no compensation is provided for.

According to a known method, of which a number of embodiments are described in the documents US 4.955.855, EP 0 125 667, EP 0 297 324, EP 0 655 303 and WO 91/03358, the differences in height of the cutting dies are offset by means of a compensating sheet made of a compressible material working in conjunction with the cutting dies.
By using such a compensating sheet, those cutting dies which stick out the most can be easily set back, so that all the cutting dies make contact with the above-mentioned base with their cutting edges.
According to the known method, use is made of compensating sheets or compensating foils made of polyurethane, metal, tetrafluoroethylene, paper or a combination thereof.
It has been revealed in practice that the use of compensating sheets made of these materials do not meet the required demands in many cases, especially when die cutting boxboard. In many cases, the use of the existing compensating sheets either results in an insufficient compensation or in a too heavy load on the cutting edges of the cutting dies. In both cases, this leads to an incomplete cut, in the first case because certain cutting dies do not go entirely through the material to be cut, - 220101~3 and in the second case because a number of the cutting edges become blunt.

The invention aims among others to remedy this problem.

To this end, the invention concerns a method for adjusting cutting dies, in particular in a die cutting machine equipped with several simultaneously operated cutting dies, which preferably work in conjunction with a base during the die cutting, whereby the differences in height of the cutting dies are offset by means of a compensating sheet made of a compressible material working in conjunction with the backsides of the cutting dies, characterized in that a sheet made of polycarbonate or a material on the basis of polycarbonate is used as a compensating sheet.

By applying a compensating sheet made of polycarbonate according to the invention, particularly good adjusting qualities are obtained. In particular, a perfect compensation is obtained without any damage to the cutting dies.

Moreover, the invention also concerns a compensating sheet to realize the above-mentioned method with, as well as a die cutting machine whose characteristics will become clear from the following description.

In order to better explain the characteristics of the invention, the following preferred embodiment of the invention is described as an example only without being limitative in any way, with reference to the accompanying drawings, in which:
2 2 û ~ Q ~ ~

figures 1, 2 and 3 schematically represent three steps of the method.

As represented in figure 1, it is known that when die cutting a material 1, in particular paper and cardboard, as well as corrugated board, use can be made of a cutting forme 2 in which several cutting dies 3A-3B are provided, as well as a metal cutting plate 4 working in conjunction therewith, provided against the backsides 5 of the cutting dies 3A-3B and the backside of the cutting forme 2, for example by means of fixing means such as bolts 6, and which can be moved by means of press-on means 7, with for example what is called a top platen 8 and a makeready 9.
The material 1 to be die cut is provided under the cutting dies 3A-3B on a usually very hard base 10 which is supported either directly or indirectly by the machine frame or the lower platen 11. A supporting plate, for example made of steel or plastic, can be either or not provided between the base 10 and the lower platen 11.

As described in the introduction, the cutting edges 12 of the cutting dies 3A-3B are initially not all situated at the same distance from the base 9. AS represented in figure 1, for example the cutting edges 12 of a number of cutting dies 3B may be situated at a larger distance from the base 10 than the cutting edges 12 of the other cutting dies 3A, due to tolerance differences in the cutting dies or due to wear and tear. Similar differences may occur due to deviations in the machine parts, such as for example the base 10 or other machine parts nat being flat. In fact, we are speaking of differences of some one hundredths to tenths of a 220 1 0 1 ~' millimetre.

In order to compensate for these differences, it is known to provide a compensating sheet 13 between the cutting forme 2 and the cutting plate 4.

In order to offer an optimal compensation, use is made of a compensating sheet 13 according to the invention which consists of polycarbonate or a material on the basis of polycarbonate.

Other components may be added to the polycarbonate, such as colorants, additives which promote the processability and the shaping of the sheets, or even other base components. Preferably, however, the material of the compensating sheet 13 predominantly consists of polycarbonate in this case as well.

Better still, pure or almost pure polycarbonate will be used.

The thickness D of the compensating sheet, which is exaggerated in the figures for clarity~s sake, preferably amounts to 0.1 to 1 mm, and better still to 0.4 to 0.6 mm, and according to the most preferred embodiment to 0.5 mm.

This relatively reduced thickness offers the advantage, apart from optimal compensating qualities, that such a compensating sheet 13 can be used in any existing die cutting machine, since the parts of such die cutting machines are usually made such that this thickness is acceptable, even when said die cutting machine was originally not designed to be equipped with a ~U~UI~

compensating sheet.

The compensating sheet 13 is preferably put directly into contact with the backsides 5 of the cutting dies 3A-3B, i.e. without any other compensating layers being included, as differences in height can be set off immediately there.

Preferably, cutting dies 3A-3B with blunt, flat backsides 5 are used, as this offers optimal compensation qualities in combination with the typical toughness and hardness of polycarbonate.

If required for the fixing of the cutting formes 2 by means of bolts in the manner shown, pre-formed openings 14 can be provided for the bolts 6 or for any other penetrating elements.

During the die cutting movement, the situations as represented in figures 1 to 3 successively occur.

After a compensating sheet 13 has been applied, and as the movement begins, the situation as represented in figure 1 occurs.
As represented in figure 2, the cutting dies 3A which stick out the most will go first through the material 1.

By applying a suitable die cutting pressure, also all the other cutting dies 3B will be subsequently pressed entirely through the material 1, as is represented in figure 5, which is possible because the backsides 5 of the cutting dies which previously stuck out further, in this case 3A, are pressed in the compensating sheet 13.

22,JlU~

By making use of a compensating sheet made of polycarbonate according to the invention, it is obtained that the differences in height of the cutting dies, plane parallelism deviations, machine distortions and/or inaccuracies are perfectly compensated for, so that very precise cuts are finally obtained.

According to the invention, the die cutting pressure is preferably systematically increased at the transition from the situation in figure 2 to that in figure 3 until all the cutting dies 3A-3B go through the material 1.
Thanks to such a temporary, systematic increase of pressure, a pressure can be applied which is just sufficient, which may possibly be maintained for the following cycles, and it can be excluded that a pressure which is bigger than necessary is applied for the cutting and that the cutting edges are loaded more heavily than necessary. Thus is also avoided that cutting dies are pressed into pieces.
The use of polycarbonate is advantageous in that, in particular when die cutting boxboard products, the cutting dies 3A-3B can go through the material 1 to be die cut without any or hardly any compression of said material. Such a polycarbonate sheet offers just enough resistance to let the cutting dies 3A-3B cut through the boxboard material, but it is still sufficiently soft so as not to damage the cutting edges 12 on the base 10 when the pressure is increased.
To sum up, it may be said that polycarbonate provides the best results, especially when die cutting paper or boxboard, both solid cardboard and corrugated board.

22 3 1 0 1 ~;

It is clear that the invention concerns the above-described method and the compensating sheet 13 used thereby, as well as die cutting machines equipped with such a compensating sheet 13 and which are possibly equipped to this end with special features for the application of such a compensating sheet 13.

Although the invention was described above on the basis of what is called a flat-bed die cutting machine, it is not excluded to apply it in rotary die cutting machines.

The cutting dies 3A-3B must not necessarily have a sharp cutting edge 12. They can also be impress knives, for example to realize folding lines or embossing formes.
The term "compensating sheet~ is to be interpreted in a broad sense according to the invention. The compensating sheet according to the invention may also consist of a polycarbonate coating provided on a base sheet or of a layer in the form of a foil.

The present invention is by no means restricted to the embodiments described as an example and represented in the accompanying drawings; on the contrary, such a method and such a compensating sheet can be made in all sorts of variants while still r~m~'n'ng within the scope of the invention.

Claims (13)

1. Method for adjusting cutting dies, in particular in a die cutting machine equipped with several simultaneously operated cutting dies (3A-3B), whereby the differences in height of the cutting dies are offset by means of a compensating sheet (13) made of a compressible material working in conjunction with the cutting dies (3A-3B), characterized in that a sheet made of polycarbonate or a material on the basis of polycarbonate is used as a compensating sheet (13).
2. Method according to claim 1, characterized in that a compensating sheet (13) is used which is 0.1 to 1 mm thick.
3. Method according to claim 1, characterized in that a compensating sheet (13) is used which is 0.4 to 0.6 mm thick.
4. Method according to claim 1, characterized in that a compensating sheet (13) is used which is 0.5 mm thick.
5. Method according to any of the preceding claims, characterized in that a compensating sheet (13) is used which is mainly formed of polycarbonate.
6. Method according to any of the preceding claims, characterized in that a compensating sheet (13) is used which is formed of pure polycarbonate.
7. Method according to any of the preceding claims, characterized in that the compensating sheet (13) is put directly into contact with the backsides (5) of the cutting dies (3A-3B).
8. Method according to claim 7, characterized in that the compensating sheet (13) is fixed between a cutting forme (2) and a cutting plate (4).
9. Method according to any of the preceding claims, characterized in that the adjustment is carried out by systematically increasing the die cutting pressure until all the cutting dies (3A-3B) are situated with their cutting edges (12) at the required height.
10. Method according to any of the preceding claims, characterized in that it is used for die cutting boxboard or other comparable material which can be die cut.
11. Method according to any of the preceding claims, characterized in that cutting dies (3A-3B) with blunt, in particular flat backsides (5) are used.
12. Compensating sheet to realize the method according to any of the preceding claims, characterized in that it mainly consists of polycarbonate.
13. Die cutting machine, characterized in that it is equipped with a compensating sheet as described in claim 12.
CA002201016A 1996-03-26 1997-03-25 Method for adjusting cutting dies, compensating sheet used to this end and die cutting machine equipped with such a compensating sheet Abandoned CA2201016A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE09600270 1996-03-26
BE9600270A BE1010067A6 (en) 1996-03-26 1996-03-26 Process for setting stan blade, offset plate used for this purpose and stan machine is equipped with such compensation plate.

Publications (1)

Publication Number Publication Date
CA2201016A1 true CA2201016A1 (en) 1997-09-26

Family

ID=3889636

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002201016A Abandoned CA2201016A1 (en) 1996-03-26 1997-03-25 Method for adjusting cutting dies, compensating sheet used to this end and die cutting machine equipped with such a compensating sheet

Country Status (6)

Country Link
EP (1) EP0798086B1 (en)
AU (1) AU1649297A (en)
BE (1) BE1010067A6 (en)
CA (1) CA2201016A1 (en)
DE (1) DE69707182T2 (en)
ES (1) ES2165560T3 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004023736A1 (en) * 2003-09-04 2005-04-07 Metall + Plastic Gmbh Device used in the manufacture of cardboard blanks in the folding box industry for punching flat packaging elements comprises a layer of magnetic material arranged between the surface of a supporting punch plate and a cardboard sheet
DE20313904U1 (en) * 2003-09-04 2003-12-11 Metall + Plastic Gmbh Device for punching packaging elements or the like.
DE102009056169A1 (en) * 2009-11-27 2011-06-01 Heidelberger Druckmaschinen Ag Method of trimming tools
DE102011014858A1 (en) 2010-04-20 2011-10-20 Heidelberger Druckmaschinen Ag Punching and/or embossing station for flat bed-sheet punching and/or -coining machines for e.g. punching paper sheet to pack product, has thin adjusting sheet held between punching and additional plates and comprising tissue paper
DE102014104105A1 (en) * 2014-03-25 2015-10-01 AXIAL Ingenieurgesellschaft für Maschinenbau mbH Finishing sheet for embossing and punching machines
CN104827514A (en) * 2014-12-31 2015-08-12 苏州市博奥塑胶电子有限公司 Novel upper die

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1007549A (en) * 1963-08-28 1965-10-13 Deritend Eng Co Improvements relating to formes
DE3317777C1 (en) * 1983-05-16 1984-09-13 R + S Stanzformen GmbH, 6000 Frankfurt Steel band punching tool for cuts from cardboard or the like.
US5172622A (en) * 1991-11-12 1992-12-22 Lamcraft, Inc. Quick change die cutter

Also Published As

Publication number Publication date
EP0798086B1 (en) 2001-10-10
EP0798086A1 (en) 1997-10-01
AU1649297A (en) 1997-10-02
BE1010067A6 (en) 1997-12-02
DE69707182T2 (en) 2002-05-29
DE69707182D1 (en) 2001-11-15
ES2165560T3 (en) 2002-03-16

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