DE102022104069A1 - Device and method for punching and/or breaking out substrates - Google Patents

Abstract

The invention relates to a device for punching and/or breaking out substrates, with a processing unit having two processing cylinders that interact with one another, between which the substrate can be inserted, with at least one part being separated from the substrate as it passes through a cylinder gap between the processing cylinders, with one of the Processing cylinder carries a male mold and the other processing cylinder carries a female mold, the female mold having at least one first recess in the region of the part to be separated, the first recess being formed in a first layer of the female mold and the extent of the first recess along the lateral surface of the processing cylinder being at least corresponds to the extension of the part to be separated and in a second layer of the die formed on the side of the first layer facing away from the male die, at least one second recess is formed, which is overlapped by the first recess, the extension of the second recess along the lateral surface of the processing cylinder being less than is the extension of the first recess along the lateral surface of the processing cylinder. The invention also relates to a method for rotary punching and/or breaking out of substrates.

Description

The invention relates to a device and a method for punching and/or breaking out substrates.

In rotary die cutting, the waste should be removed from the machine after the cutting process if possible. Various known suction methods are used for this purpose.

For thin material, a punching cylinder is provided with suction holes, which are connected to a lateral air control device and can be switched to suction or blowing. A punching plate activates the holes required for the layout and closes the remaining unused holes.

For cardboard material it is known to use a stripping unit which is connected downstream of the stamping unit and has a transport cylinder with suction channels and a stripping cylinder which is assigned to the transport cylinder. A knockout plate activates the vents needed for the layout and closes the remaining unused vents. Such a trained stripping is from DE 10 2016 223 226 A1 known.

The DE 101 47 486 A1 discloses a punching or cutting device with a magnetic cylinder and a suction device arranged next to the magnetic cylinder for sucking off punched-out pieces of material.

The EP 0 281 064 A1 and the WO 2006/117646 A1 disclose devices for treating substrates with separators.

The EP 0 878 277 A2 discloses a device in which waste parts are broken out of pre-cut webs and the benefits are conveyed on with frames for a short time.

In the known solutions, comparatively high centrifugal forces act on the punched-out or broken-out parts of the substrate, which are guided on curved circular paths.

The invention is based on the object of creating a device and a method for punching and/or breaking out substrates, in which the functional reliability is increased when transporting parts cut out of the substrate.

The object is achieved according to the invention by the features of claims 1, 12 and 13, respectively.

The advantages that can be achieved with the invention consist in particular in the fact that, despite a predetermined fixed arrangement of pneumatically pressurizable openings in the processing cylinder carrying the matrix, comparatively large holding forces can be exerted on the parts to be separated from the substrates for a large number of possible subjects.

Exemplary embodiments of the invention are shown in the drawings and are described in more detail below.

• 1 eine schematische Darstellung einer Bogendruckmaschine mit einer Vorrichtung zum Stanzen und/oder Ausbrechen von Substraten;
• 2 ein Bearbeitungswerk einer Vorrichtung zum Stanzen und/oder Ausbrechen von Substraten;
• 3 eine Matrize in schematischer Darstellung mit Nutzen und Abfallteil;
• 4 eine Matrize in schematischer Darstellung.

Show it:

• 1 a schematic representation of a sheet-fed printing press with a device for punching and/or breaking out substrates;
• 2 a processing unit of a device for punching and/or breaking out substrates;
• 3 a die in a schematic representation with benefit and waste part;
• 4 a matrix in schematic representation.

The device for punching and/or breaking out substrates with a processing unit 46 with two processing cylinders 96 interacting with one another; 97, between which the substrate can be introduced, the substrate emerging from the passage through a cylinder gap between the processing cylinders 96; 97 at least one part 09; 10 can be designed as an independent machine and in this case has a feed system for the substrate that is not described in detail.

According to a further embodiment, the device for punching and/or breaking out substrates is part of a machine that processes substrate sheets and is operated inline with the units of the machine that processes substrate sheets. In particular, a sheet-fed printing press is provided as the substrate sheet-processing machine, as is the case, for. Am 1 is shown. The invention is described below using the example of a sheet-fed printing press, in particular an offset sheet-fed printing press, with this description also being intended to apply to other substrate-processing machines as well as to an embodiment of the device as an independent machine.

The sheet-fed printing press includes a feed system for substrates, also referred to as feeder 07. The substrates are in particular arcuate workpieces made of paper, cardboard, cardboard, corrugated understood cardboard, plastic or the like, which are preferably printable or printed. The substrates are present as a stack in the feeder 07 of the sheet-fed printing press and are separated by it and fed via an acceleration system 08 to the aggregates of the sheet-fed printing press downstream of the feeder 07. The sheet-fed printing press comprises at least one, preferably several, printing units 06. The printing units 06 each comprise, in particular, a printing cylinder 41 and a sheet guiding cylinder 42, preferably embodied as a transfer drum 42. A rubber blanket cylinder 43 carrying a rubber blanket is assigned to the printing cylinder 41, and this in turn is assigned a plate cylinder 44 carrying a printing plate. The plate cylinder 44 is in contact with an inking unit 45 and preferably also with a dampening unit. In printing unit 06, the substrate sheet is guided in a manner known per se by the sheet holding systems provided on impression cylinder 41 and sheet guiding cylinder 42, printed in the printing gap formed between impression cylinder 41 and blanket cylinder 43, and fed to the downstream unit of the sheet-fed printing press, e.g. B. in the form of the next printing unit 06 handed over. One or more processing units 46 can be configured downstream of the printing unit(s) 06 or between the printing units 06.

In addition to units 46, which are preferably embodied as printing units 06 and processing units 46, the machine that processes substrate sheets, in particular the sheet-fed printing press, can also include other units that can be arranged individually or in groups in any order. One or more coating units can be arranged in addition to the aforementioned units 46 or as an alternative to the printing units 06. A coating unit preferably includes a device for sheet transport, in particular a sheet-guiding cylinder and a coating device, and is designed for partial or full-surface coating of a substrate sheet with an adhesive agent.

The machine that processes substrate sheets, in particular the sheet-fed printing press, preferably also includes one or more coating units, which are preferably installed downstream of printing units 06 or are connected to processing units 46.

A machine that processes substrate sheets that is not a sheet-fed printing press can have the same structure as the sheet-fed printing press described, minus the printing units 06.

Instead of forming two processing units 46, the machine processing the substrate sheet, in particular a sheet-fed printing machine, can also include precisely one processing unit 46.

If two processing units 46 are formed, the first processing unit 46 in the transport direction is preferably used for punching and can be converted into a punching unit by being equipped with a corresponding tool, while the second processing unit 46 in the transport direction is preferably used for breaking out and can be converted into a stripping unit by being equipped with a corresponding tool , also known as a separation unit, is converted.

The structure of a processing unit 46 is also described below as representative of the structure of one or more further processing units 46 .

A processing unit 46 includes two processing cylinders 96; 97, one of which, preferably the lower one, has a sheet holding system. The sheet holding system of the processing cylinder 96 can be designed as a clamping gripper system or as a suction gripper system. The processing cylinders 96; 97 are associated with each other to form a cylinder gap. Between the processing cylinders 96; 97 is equipped with the processing cylinder 96; 97 with a suitable tool from the substrate when passing through the cylinder gap at least one part 09; 10 cut out.

The lower processing cylinder 96 and/or the upper processing cylinder 97 preferably has tool carriers or elevator carriers that act in a positive or non-positive manner. The non-positively acting tool carriers or elevator carriers are designed in particular to act magnetically. Accordingly, the lower processing cylinder 96 and/or the upper processing cylinder 97 can be designed as a magnetic cylinder. In the above context, a magnetic cylinder is to be understood as meaning at least all types of cylinders or drums which exert a magnetic force on adjacent ferromagnetic elements, in particular tools, in the area of their periphery. Such a cylinder can be constructed as a full magnet cylinder or cylinder with embedded magnet segments or as a support cylinder for magnet segments or magnet sheets arranged on it, which applies to the construction as a drum in the analogous sense.

The lower processing cylinder 96 and/or the upper processing cylinder 97 can also be designed as surface-hardened cylinders.

The lower processing cylinder 96 is preferably twice as large, ie it transports two substrate sheets per revolution. However, the invention is not limited to a double-sized version of the lower processing cylinder or cylinders 96 . The invention is described below using a single-sized system. This description is also representative of the double-sized system or multi-sized system in analogous correspondence.

The lower processing cylinder 96 and/or the upper processing cylinder 96 has an outer surface with openings 12 which are connected to air supply means. In particular, only the lower processing cylinder 96 can have openings 12 . First and second openings 12 are preferably formed, it being possible for the first openings 12 to be supplied with air or to be supplied independently of the second openings 12 .

In particular, first air supply means for supplying the first openings 12 with air and second air supply means for supplying the second openings 12 with air can be provided. In the following context, air is understood to mean all forms of system air, i. H. in particular blown air or suction air, which are particularly suitable physical effect such. B. to exert force and which can be identified by at least one of the parameters static pressure, dynamic pressure or flow rate. In particular, the chemical composition of the air or its moisture content is not important. Such air is generated in a manner known per se using compressors, compressors, vacuum pumps, suction pumps or similar components. The aforesaid air generators can be included in the first and second air supply means and in particular together with all the means supplying air to the openings 12 and/or controlling the supply of air forming the air supply means.

The air supply means of the first and/or the second openings 12 are preferably designed to be switchable. Switchability in this sense means, in particular, switching between suction air and blast air, it not being important which type of air supply is switched to which type.

The first and second openings 12 are preferably arranged alternately in the circumferential direction of the lower processing cylinder 96 and/or in the axial direction of the lower processing cylinder 96 .

The first and/or the second openings 12 are preferably in the form of grooves or holes. The arrangement of the first and second openings 12 in the lateral surface of the lower processing cylinder 96 preferably results in a fine-meshed network of elements with which selected areas of tools arranged on the lower processing cylinder 96 can be supplied with air in a targeted manner.

The air supply means for supplying the first and second openings 12 preferably comprise one or more rotary valves or rotary inlets. The rotary slides or rotary inlets are preferably formed on the end face of the lower processing cylinder 96 or are assigned to it. Two rotary slides or two rotary inlets are preferably formed on opposite end faces of the lower processing cylinder 96 . Such a rotary valve or such a rotary inlet preferably comprises a disc which is associated with one of the end faces of the lower processing cylinder 96 . A plurality of groove-shaped recesses are preferably formed in the disk, which preferably extend in the shape of a segment of a circle, coaxially to the axis of rotation of the lower processing cylinder 96 . The recesses are supplied with air via supply nozzles and extend in different radii of the lower processing cylinder 96. Each of the recesses does not have to be continuous in the circumferential direction of the disk, but rather can be perforated. The recesses correspond in terms of their distance (radius) to the axis of rotation of the lower processing cylinder 96 with openings formed in the end face of the lower processing cylinder 96 . Each of the openings in the end face of the lower processing cylinder 96 communicates via additional lines either with a single or part of the first openings 12 or with a single or part of the second openings 12 in the lateral surface of the lower processing cylinder 96. Of course, this only applies as long as the respective opening in the end face of the lower processing cylinder 96 of the respective recess depending on the angular position of the lower processing cylinder 96 opposite.

The first and/or the second air supply means are preferably designed to switch off the suction air supply or to switch between the suction air supply and the blower air supply depending on the angular position of the openings 12 supplied in each case.

The disc is preferably connected to a frame via a torque support and is rotatably mounted on the lower processing cylinder 96 . The lower processing cylinder 96 is preferably rotatably mounted in the same frame to which the torque support is articulated.

In order to shift the areas of suction or blown air that are formed on the lateral surface of the lower processing cylinder 96 in relation to the angle of rotation, adjusting elements can be provided for rotating the disk.

The structure of the upper processing cylinder 97 can correspond to that of the lower processing cylinder 96, to which reference is hereby made, with only one of the processing cylinders 96; 97 has a sheet holding system.

The upper processing cylinder 97 can also be designed without openings 12 .

One of the processing cylinders 96; 97 carries a tool in the form of a male die 30 and the other machining cylinder 96; 97 carries a tool in the form of a die 22. The lower processing cylinder 96 preferably carries the die 22 and the upper processing cylinder 97 carries the patrix 30. The die 22 and/or the patrix 30 preferably consist of a ferromagnetic material or have components thereof. You are the processing cylinders 96; 97 assigned interchangeably.

In the area of at least one part 09; 10 at least one first recess 24 on.

The first recess 24 is formed in a first layer 23 of the die 22 . The extension of the first recess 24 along the lateral surface of the processing cylinder 96; 97 corresponds at least to the extension of the part 09 to be separated; 10. The extent of the first recess 24 is preferably along the lateral surface of the processing cylinder 96; 97 by an amount greater than the extent of the part 09 to be separated; 10. The amount is chosen such that the part to be separated 09; 10 is not jammed in the first recess 24, especially when tilted, and can be easily displaced from the first recess 24. The thickness of the first layer 23 preferably corresponds to the thickness of the substrate being processed.

At least one second recess 26 is formed in a second layer 25 of the matrix 22 formed on the side of the first layer 23 facing away from the patrix 30 . The first recess 24 overlaps the second recess 26 at least in regions. The first recess 24 preferably overlaps the second recess 26 on all sides. It is also possible for the first and the second recess 24; 26 to form with overlapping areas that only in the circumferential direction of the processing cylinder 96; 97 or only in the axial direction of the processing cylinder 96; 97 to both sides of the second recess 24.

The extension of the second recess 26 along the lateral surface of the processing cylinder 96; 97 is smaller than the extension of the first recess 24 along the lateral surface of the processing cylinder 96; 97

At least one third recess 28 is preferably formed in a third layer 27 of the matrix 22 formed on the side of the second layer 25 facing away from the patrix 30 . The third recess 28 is different from the first and/or second recess 24; 26 overlapped. The first and/or second recess 24; 26 overlap the third recess 28 at least in certain areas and preferably on all sides. The extension of the third recess 28 along the lateral surface of the processing cylinder 96; 97 is smaller than the extension of the second recess 26 along the lateral surface of the processing cylinder 96; 97

The first recess 24 in the matrix 22 corresponds to at least one raised area of the patrix 30.

The at least one part 09; to be separated or separated from the substrate; 10 can be a waste part 09 or a benefit 10. Preferably, the part 09 to be cut out or cut out is; 10 a waste part 09.

The female mold 22 and/or the male mold 30 can be designed as punching plates and/or have punching lines and/or counter-punching lines.

By arranging such a die 22 and/or patrix 30 in a machining unit 46, in particular on the lateral surface of a machining cylinder 96; 97, this becomes a punching machine.

The matrix 22 and/or the patrix 30 can also be designed as knock-out plates.

In this case, they preferably have no punching lines and/or counter-punching lines.

By arranging such a die 22 and/or the patrix 30 in a machining unit 46, in particular on the lateral surface of a machining cylinder 96; 97, this becomes the stripping mechanism, also known as the separating mechanism.

Preferably, the first layer 23 has a thickness in the range of 0.2 to 0.4 millimeters or is 0.3 millimeters.

The second layer 25 can in particular have a thickness in the range of 1.2 to 2.0 millimeters. The thickness of the second layer 25 can also be exactly 1.39 or 1.69 millimeters

More preferably, the thickness of the third layer 27 is in the range of 0.2 to 0.4 millimeters or is 0.3 millimeters.

An arrangement of the die 22 on the processing cylinder 96; 97 takes place in such a way that at least one opening 12 that can be supplied or is supplied with air is in the outer surface of the processing cylinder 96; 97 from the second and/or the third recess 26; 28 is covered.

The areal extent of the second cutout 26 is preferably in the range from 99 percent to 20 percent or in the range from 99 percent to 50 percent or in the range from 95 percent to 70 percent or in the range from 95 percent to 50 percent of the areal extent of the first cutout 24

It is advantageous if the shape of the second recess 26 is adapted to the shape of the first recess 24 . The shape of the second recess 26 and/or the shape of the third recess 28 is preferably non-circular.

The formation of the second recess 26 allows more force to be applied to the parts 09; 10, preferably the waste parts 09 are exercised. The second recess 26 forms a vacuum chamber increasing the suction area. The shape of the second recess 26, in particular of the vacuum chamber, preferably represents a reduced contour of the part 09; 10, preferably the waste part 09.

Preferably, the shape of the second recess 26 corresponds to the shape of the first recess 24 reduced by a reduction factor. The reduction factor is preferably in the range of 1 to 80 percent or greater than 5 percent. The second recess 26 is preferably dimensioned in such a way that the second layer 25 has a bearing surface on the edge of the part 09; 10 forms.

This type of design of the second recess 26 seals the part 09 to be cut out or the part 09 that has been cut out; 10 the second recess 26 in the second layer 25 and the loss of air is avoided or significantly reduced.

The independence of the supply of the second recess 26, in particular the vacuum chamber, from the arrangement of the first and second openings 12 to which air is applied differently in the lateral surface of the processing cylinder 96; 97 reduces the amount of preparation required to manufacture the die 22.

A method for rotary punching and/or breaking out of substrates using a processing unit 46 with two processing cylinders 96; 97 described.

The method can be carried out in particular using the device described for rotary punching and/or breaking out of substrates or using the machine processing substrate sheets described.

The method comprises the following steps, which in particular are carried out in the following order.

First, the substrate is provided in step a, the male mold 30 in step b, and the female mold 22 in step c.

The die 22 is prepared according to step c in such a way that in the die 22 in the region of a part 09; 10 at least one first recess 24, at least one second recess 26 and at least one third recess 28 are formed, the first, the second and the third recess 24; 26; 28 completely or partially overlap and in different layers 23; 25; 27 of the die 22 with mutually different extensions along the outer surface of the processing cylinder 96; 97 are trained.

After they have been made available, the male mold 30 and the female mold 22 are each placed on a processing cylinder 96; 97 arranged.

Then, by inserting the substrate between the rotating processing cylinders 96; 97 punched or broken out in step e.

In step d, the die 22 is preferably positioned on the lateral surface of the processing cylinder 96; 97 arranged in such a way that at least one opening 12 is covered by the third recess 28 .

In particular, in step e, the part 09; 10 from a raised area the patrix 30 is pressed into the first recess 24, whereby it leads to the separated part 09; 10 will.

Preferably, the separated part 09; 10, in particular the waste part 09, is held in the first recess 24 by suction air, the second recess 26 being on the side of the separated part 09; 10 along the lateral surface of the processing cylinder 96; 97 extending suction chamber forms. In particular, the suction chamber is in the direction of the lateral surface of the processing cylinder 96; 97 extending overlaps between the severed part 09; 10, in particular the waste part 09 and a second layer 25 of the die 22, which has the second recess 26, is sealed.

Reference List

06

printing unit

07

investor

08

acceleration system

09

Part, part to be separated, waste part

10

Part, to be separated, benefit

12

opening

22

die

23

shift, first

24

recess, first

25

layer, second

26

recess, second

27

layer, third

28

recess, third

29

-

30

patrix

41

pressure cylinder

42

Sheet guiding cylinder, transfer drum

43

blanket cylinder

44

plate cylinder

45

inking

46

Processing work, work

96

Processing cylinder, lower

97

Processing cylinder, upper

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102016223226 A1 [0004]
• DE 10147486 A1 [0005]
• EP 0281064 A1 [0006]
• WO 2006117646 A1 [0006]
• EP 0878277 A2 [0007]

Claims (17)

Device for punching and/or breaking out substrates, with a processing unit (46) with two processing cylinders (96; 97) interacting with one another, between which the substrate can be inserted, the substrate, when passing through a cylinder gap between the processing cylinders (96; 97), at least one part (09; 10) is cut out, with one of the processing cylinders (97; 96) carrying a male mold (30) and the other processing cylinder (96; 97) carrying a female mold (22), the female mold (22) being in the area of the part (09; 10) to be separated has at least one first recess (24), the first recess (24) being formed in a first layer (23) of the die (22) and the extension of the first recess (24) along the lateral surface of the processing cylinder (96; 97) corresponds at least to the extent of the part (09; 10) to be separated and in a second layer (25) of the die (22) formed on the side of the first layer (23) facing away from the die (30) at least a second recess (26) is formed, which is overlapped by the first recess (24), the extension of the second recess (26) along the lateral surface of the processing cylinder (96; 97) is smaller than the extent of the first recess (24) along the lateral surface of the processing cylinder (96; 97). device after claim 1 , characterized in that in a on the male (30) facing away from the second layer (25) formed third layer (27) of the matrix (22) at least one third recess (28) is formed, which is from the first and / or of the second recess (24; 26) is overlapped, the extent of the third recess (28) along the lateral surface of the processing cylinder (96; 97) being smaller than the extent of the second recess (26) along the lateral surface of the processing cylinder (96; 97) is. device after claim 1 or 2 , characterized in that the first recess (24) in the matrix (22) corresponds to at least one raised area of the patrix (30). device after claim 1 , 2 or 3 , characterized in that the at least one part (09; 10) separated from the substrate is a waste part (09) or a blank (10). device after claim 1 , 2 , 3 or 4 , characterized in that the matrix (22) and the patrix (30) are designed as knock-out plates. device after claim 1 , 2 , 3 or 4 , characterized in that the matrix (22) and/or the patrix (30) are designed as punching plates and/or have punching lines and/or counter-punching lines. device after claim 1 , 2 , 3 , 4 , 5 or 6 , characterized in that a processing cylinder (96; 97) has a sheet holding system for fixing the front edges of the sheet-like substrate and the matrix (22) or the male mold (30) is assigned to the processing cylinder (96; 97) having the sheet holding system in an exchangeable manner. device after claim 1 , 2 , 3 , 4 , 5 , 6 or 7 , characterized in that the first layer (23) has a thickness in the range of 0.2 to 0.4 millimeters and/or that the second layer (25) has a thickness in the range of 1.2 to 2.0 millimeters and /or that the third layer (27) has a thickness in the range of 0.2 to 0.4 millimeters. device after claim 1 , 2 , 3 , 4 , 5 , 6 , 7 or 8th , characterized in that at least one processing cylinder (96; 97) has a lateral surface with openings (12), the openings (12) being connected to air supply means for supplying the openings (12) with air, in particular with suction air and/or with blown air are, wherein at least one opening (12) of the second and / or the third recess (26; 28) is covered. device after claim 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8th or 9 , characterized in that the areal extent of the second recess (26) is in the range from 99 percent to 20 percent or in the range from 99 percent to 50 percent or in the range from 95 percent to 70 percent or in the range from 95 percent to 50 percent of areal extent of the first recess (24). device after claim 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8th , 9 or 10 , characterized in that the shape of the second recess (26) is adapted to the shape of the first recess (24) and is non-circular or that the shape of the second recess (26) corresponds to the shape of the first recess (24) reduced by a reduction factor. Machine processing substrate sheets, in particular sheet-fed printing machine, with a device for punching and/or breaking out substrates claim 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8th , 9 , 10 or 11 . Process for rotary punching and/or breaking out of substrates, in particular with a device claim 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8th , 9 , 10 , 11 or 12 , With a processing unit (46) with two interacting processing cylinders (96; 97), wherein the process ren comprises the following steps, which are carried out in particular in the following order: a) providing the substrate; b) providing a male mold (30) c) providing a female mold (22) which has at least one first recess (24), at least one second recess (26) and at least one third in the area of a part (09; 10) to be separated from the substrate Recess (28), wherein the first, the second and the third recess (24; 26; 28) overlap completely or partially and wherein the recesses (24; 26; 28) in different layers (23; 25; 27) of Die (22) are formed with mutually different extensions along the lateral surface of the processing cylinder (96, 97); d) arrangement of the male mold (30) and the female mold (22) on a respective processing cylinder (96; 97); e) punching or breaking out the substrate by inserting the substrate between the rotating processing cylinders (96; 97). procedure after Claim 13 , characterized in that the matrix (22) is arranged in step d) on the lateral surface of a processing cylinder (96; 97) having openings (12) that can be subjected to suction air in such a way that at least one opening (12) is separated from the third recess (28) is covered. procedure after Claim 13 or 14 , characterized in that in step e) the part (09; 10) to be separated is pressed by a raised area of the male part (30) into the first recess (24), becoming the separated part (09; 10). procedure after claim 15 , characterized in that the detached part (09; 10) is held in the first recess (24) by suction air, the second recess (26) being a side of the detached part (09; 10 ) along the lateral surface of the processing cylinder (96; 97) extending suction chamber forms. procedure after Claim 16 , characterized in that the suction chamber is formed by overlaps extending in the direction of the lateral surface of the processing cylinder (96; 97) between the separated part (09; 10) and a second layer (25) of the die (22 ), is sealed.

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