Method and apparatus for making a tear-away lid

Abstract

The invention relates to a method for producing a tear-off lid (27). In this method, a lid ring (8) having a central removal opening (17) is formed from a lid blank (9) by punching with a punching tool (1, 5) having a die (6) and a punching punch (2, 3), the removal opening being surrounded by a sealing bead (18). The edge of the removal opening (17) is then formed by pulling out to form a flange (20) protruding away from the sealing bead (18) on a predetermined lid inner side (bottom side), the flange (20) is rolled up at its free end, and a tear-off foil (24) is sealed or glued to the sealing bead (18) on a predetermined lid outer side (top side). According to the invention, during the punching process, the die (6) is arranged on a predetermined inner side (lower side) of the lid, and the punching punch (2, 3) is moved from a predetermined outer side (upper side) of the lid into the die (6), punching out a punching block (16) and conveying the punching block (16) through the die (6) by means of compressed air to a conveying device (33), by means of which the punching block is removed from the die area. It has been found that by means of this measure, the known and established method and device for producing tear-off lids can be modified with very little effort so that during the punching process of the lid blank (9), a punching or cutting burr is formed on a predetermined inner side (lower side) of the resulting lid ring (8), which is desirable when producing lids with an "inverse C-shaped curl".

Description

Technical Field

[0001] The invention relates to a method for producing a tear-off lid, a device for producing a tear-off lid, in particular according to the method, a punching station for the device, and a tear-off lid produced or producible using the method. Background Art

[0002] Tear-off covers (so-called Peel Off Ends or POE) are known, for example, from DEU 29817592 or DEU 9203953.

[0003] refer to Figures 1 to 6 The production of tear-off caps according to the prior art known to a person skilled in the art may be briefly explained.

[0004] Figure 1 A cover blank 9 is shown. At the beginning of a transport path of a known production plant 10, a stack 11 is shown, which contains a plurality of such cover blanks 9, which are individually unstacked and processed along the transport path at various processing stations 14, 19, 21, 25, 26, from which a cover ring 8 is first formed (see Figure 2 ) and these cover blanks are then further processed until the finished tear-off cover 27 (see Figure 5 ). The cover blank 9 is, for example, a round or oval disk made of a coated and thus corrosion-resistant metal, in particular of a coated tinplate or aluminum sheet. The disk has, for example, a diameter of 11 cm. These blanks 9 are already preformed at their edges 12 by a processing machine (not shown) and the formation of the edges 12 is then used to fasten the finished tear-off cover 27 to the container 28 or can by a folding connection. This is known to a person skilled in the art and will not be explained in detail here.

[0005] The conveying device 13 that conveys the cover blank, cover ring and tear-off cover from one processing station to the next processing station along the transport line in the manufacturing device 10 in the direction of arrow A is particularly composed of two parallel toothed belts, on which a receptacle for the cover blank or cover ring is provided, as known to those skilled in the art from WO2006 / 017953. This is also not explained further here. In the corresponding processing stations that are known to those skilled in the art according to the prior art and are only schematically shown here, the blanks or rings to be processed are respectively lifted by the conveying device and processed by the processing station and put back on the conveying device. This is indicated in the processing station by arrows pointing upward and downward. In the processing station, the drive device of the processing station is respectively indicated below the conveying mechanism. The drive device is used to lift and lower the blanks and cover rings and to implement the corresponding processing steps.

[0006] In the punching station 14, the cover ring 8 is first formed from the cover blank 9 by punching out the middle part 16 of the blank downwards and usually discarding it as waste (see Figure 2 ). Thus, a removal opening 17 of the tear-off lid is formed, which is closed with a tear-off foil 24 in a subsequent production step. The removal opening 17 then retains the sealing bead 18. In the processing station 19, the edge of the removal opening 17 is pulled upwards to form a flange 20 (see Figure 3 ). This flange 20 is rolled up in a further processing station 21 towards the removal opening or away from it into a so-called "curl". This rolled-up portion 22, which then forms the edge of the removal opening 17, serves to protect the user of the can from a sharp-edged cut edge 23 when removing the contents of the can. Depending on the circumference of the rolled-up portion, the rolled-up portion is referred to as a "C-curl" (the cut edge is not arranged within the rolled-up portion) or as a "retort-curl" (the cut edge is arranged within the rolled-up portion), and the "curl" rolled away from the removal opening is referred to as a "reverse C-curl" or "reverse-retort-curl". In the case shown here, a so-called retort curl 22 is formed (see Figure 4 ).

[0007] The previous production steps are carried out in a position in which the cover blank 9 and the cover ring 8 are arranged with their later upper side or with the sealing flange 18 pointing downward. This is also a preferred embodiment in the present invention. As mentioned, the blank 9 or the ring 8 is lifted by the conveyor device 13 in the individual processing stations 14, 19 and 21, processed and put back again, after which the conveyor device carries out a conveying step, which guides the cover blank 9 or the cover ring 8 to the next processing station. If the production steps are carried out with the sealing flange 18 pointing downward, as shown, a deflection station 23 now follows, which deflects the cover ring 8, so that during further processing the sealing flange 18 is located on the top after the deflection station 23 in the conveyor device 13 and the processing stations 25, 26.

[0008] After this, the tear-off foil 24 is sealed onto the sealing flange 18, which can be done in two stages using a pre-sealing station 25 and a main sealing station 26. The sealing process is also known to the person skilled in the art and will not be explained in further detail here. Other processing stations may follow in which the sealing foil 24 is embossed, the tear-off tab 15 is positioned, and a leak-tightness test is performed. This is also known to the person skilled in the art and will not be explained in further detail here. The finished tear-off lid 27 is output at the end of the known manufacturing device 10 (see Figure 5), the removal opening 17 of the tear-off lid is covered by a tear-off foil 24, which is sealed to the sealing flange 18. The edge of the removal opening 17 is formed by the curved neck curling part 22. The finished tear-off lid 27 can be fixed to the outer cover of the can (which is in the can) by means of its folded edge 12. Figure 5 The can is then opened by tearing off the tear-off foil 24 with its tear-off tab 15 from the lid ring 8, thereby exposing the removal opening 17.

[0009] In the above-described apparatus according to the prior art, during the punching of the lid blank, a punching or cutting burr is formed on the intended outer side (lower side) of the lid ring produced, which is suboptimal, in particular when a "reverse C-curl" (curl facing away from the removal opening) is subsequently produced. From a product technology point of view, it is desirable that in an otherwise unchanged method sequence or apparatus concept, a (necessary) punching or cutting burr is formed on the intended inner side (upper side) of the lid ring produced. Summary of the invention

[0010] The object of the present invention is to provide a technical solution with which the previously described known and established method and device for producing tear-off lids can be modified with the least possible expenditure on equipment technology in such a way that a punched or cut burr is formed on the other lid side in a substantially unchanged method sequence and device concept.

[0011] This object is achieved by the method, the device and the punching station according to the invention.

[0012] According to these, a first aspect of the invention relates to a method for producing a tear-off lid. Here, a lid ring having a central removal opening surrounded by a sealing flange is formed from a lid blank by punching using a punching die. The punching die has a die and a punching punch.

[0013] The edge of the removal opening is then formed by pulling out to form a collar which projects away from the sealing bead on that side which forms the lid inner side in the subsequent intended use of the lid to be produced (the intended lid inner side).

[0014] The collar is subsequently rolled up at its free end and the tear-off foil is then sealed or glued to the sealing bead on that side which forms the lid outer side in the subsequent intended use of the lid to be produced (the intended lid outer side).

[0015] According to the present invention, during the stamping process, the die is arranged on the side of the cover to be manufactured that constitutes the inner side of the cover in the subsequent specified use (specified cover inner side) and the stamping punch is moved into the die from the side of the cover to be manufactured that constitutes the outer side of the cover in the subsequent specified use (specified cover outer side) to punch out the stamping block.

[0016] The punched piece produced in this way is conveyed by means of compressed air through the die to a conveying device, with which the punched piece is removed from the die area.

[0017] The invention makes it possible to modify the currently known and established method and device for producing tear-off caps with very little effort in such a way that, with a substantially unchanged method sequence and device concept, a punching or cutting burr is formed on that side which forms the outer side of the cap in the subsequent intended use of the cap to be produced (the intended outer side of the cap).

[0018] In a preferred embodiment of the method, a cover blank is used which is made of a ferromagnetic material. A magnetic conveyor belt is used as a conveying device for removing the punched block from the die area. This allows functionally reliable handling and removal of the punched block in the narrowest of spaces and with a minimum of moving components.

[0019] In another preferred embodiment of the method, a vacuum conveyor belt is used as a conveying device for removing the punched block from the die area. This allows functionally reliable handling and removal of the punched block even in the tightest of spaces and with a minimum of moving components, and allows both ferromagnetic and non-ferromagnetic cover blanks, for example made of aluminum, to be handled.

[0020] Magnetic conveyor belts and vacuum conveyor belts are generally known in the field of conveyor systems and therefore do not need to be explained in more detail here.

[0021] The compressed air for conveying the punching block to the conveying device is advantageously conveyed through the punching punch.

[0022] It is preferred that the compressed air guided through the punching punch is discharged via one or more discharge openings on the side of the punching punch facing the cover blank or the punching block. In this way, the punching block can be directly loaded with air on its side facing the punching punch and thus reliably guided away by the air.

[0023] Advantageously, the compressed air guided through the punching punch is discharged via a plurality of identical discharge openings on the side of the punching punch facing the cover blank or the punching block, the discharge openings being at the same distance from one another. This arrangement of the discharge openings makes it possible to very effectively prevent the punching block from tilting or tilting in the die.

[0024] In an embodiment of the method, it is further preferred that compressed air for conveying the punch block to the conveying device is provided intermittently, in which the compressed air guided through the punching punch is discharged via one or more discharge openings on the side of the punching punch facing the cover blank or the punch block. This advantageously takes place in that no compressed air is provided when the die is open and compressed air is provided when the die is closed. This simplifies the process control and can save energy compared to permanent loading.

[0025] It is further preferred here that the discharge opening is loaded with compressed air only at the start of the punching process or even more preferably only after the punching process is completed, preferably starting from reaching the end point of the movement of the punching punch, which in an upwardly working punch is the top dead center of the movement of the punching punch.

[0026] In the last-mentioned case, the punch block is completely separated from the cover blank before the impingement with compressed air takes place, which results in the advantage that a clean, controllable process is possible.

[0027] In a preferred first variant of the method according to the invention, the flange formed by pulling out from the edge of the removal opening is rolled up toward the removal opening into a C-shaped curl or a curved neck curl.

[0028] In a preferred second variant of the method according to the invention, the flange formed by pulling out from the edge of the removal opening is rolled away from the removal opening into an inverted C-shaped curl or an inverted neck curl. In this second variant, the advantages of the invention are particularly effective.

[0029] It is further preferred in the method according to the invention that during the punching process the punching punch is moved and the die is stationary, that during the cutting process the punching punch is inserted into the die from bottom to top and / or that the cover ring is turned between rolling up the flange and sealing or gluing the tear-off foil. This makes it possible to use currently known and established production plants for carrying out the method with minor modifications to the punching station. A corresponding punching station according to the invention is the subject of a third aspect of the invention, which will be explained in the following paragraphs.

[0030] Preferably, after the punching process, the cover ring is conveyed out of the cutting die in a first conveying direction and the punched block is removed from the die area by the conveying device in a second conveying direction, which extends transversely to the first conveying direction, in particular perpendicularly to the first conveying direction. This results in the advantage that the conveying device can be used to remove the punched block directly into an area upstream or downstream of the production plant.

[0031] A second aspect of the invention relates to a device for producing a tear-off lid in which a tear-off foil is sealed or glued to a sealing surface arranged around a removal opening on the upper side of the tear-off lid. Preferably, the device is designed for producing a tear-off lid according to the method according to the first aspect of the invention.

[0032] The device comprises a first conveying device for cover blanks, cover rings and tear-off cover, and processing stations, which are arranged successively along the conveying direction for processing the cover blanks, cover rings and tear-off cover. Here, the first processing station is designed as a stamping processing station, which is used to form a cover ring with a central removal opening surrounded by a sealing flange by stamping the cover blank with a stamping die, and the stamping die comprises a die and a punch. The second processing station of the device is designed to form a flange protruding from the cover ring, the third processing station is designed to roll up the flange into a "curl", and the fourth processing station is designed to seal or adhere the tear-off foil to the sealing flange. Such a device is described at the beginning with the aid of Figures 1 to 6 describe.

[0033] The first processing station according to the invention is designed such that during the punching process, the die is arranged on the side of the cap to be produced that forms the inner side of the cap in the subsequent intended use (the intended cap inner side) and the punching punch is moved into the die from the other side, i.e., the side that forms the outer side of the cap in the subsequent intended use (the intended cap outer side), while punching out the punching block. There is a device for conveying the punching block through the die by means of compressed air to a second conveying device assigned to the first processing station, by means of which the punching block is removed from the die area in the intended operation of the device.

[0034] Such a device for producing tear-off lids has the advantages already mentioned for illustrating the method and can be constructed from existing devices with very little modification effort in terms of device technology, with essentially unchanged method sequence and device concept.

[0035] The second conveying device is preferably a magnetic conveyor belt or a vacuum conveyor belt, with which the punching block can be removed from the die area.

[0036] The stamping punch advantageously has one or more air channels for conveying compressed air in its interior which is used during the intended operation in order to convey the stamping block by means of compressed air through the die to the second conveying device.

[0037] For this purpose, the punching punch advantageously has one or more outlet openings for compressed air on its side facing the cover blank or the punching block. In this way, the punching block can be loaded with compressed air directly on its side facing the punching punch and thus reliably guided away from the punching punch to the second conveying device.

[0038] Particularly preferably: the punching convex die has a plurality of, for example three, in particular identical discharge openings, which have the same spacing from one another. By such a configuration of the discharge openings, the tilting of the punching block in the die can be prevented very effectively.

[0039] It is further preferred that the device has a control device by means of which the compressed air for conveying the punching block to the second conveying device can be provided intermittently or intermittently during the specified operation, and more precisely preferably in such a way that no compressed air is provided when the mold is open and compressed air is provided when the mold is closed, in particular from the point of reaching the end of the movement of the punching punch. This simplifies the process control and saves energy.

[0040] In a preferred first variant of the device according to the invention, the third processing station is designed such that the flange formed by pulling out from the edge of the removal opening is rolled up toward the removal opening into a C-shaped curl or a curved neck curl.

[0041] In a preferred second variant of the device according to the invention, the third processing station is configured so that the flange formed by pulling out from the edge of the removal opening is rolled up away from the removal opening into an inverted C-shaped curl or an inverted neck curl. In this second variant, the advantages of the invention are particularly evident in their effect.

[0042] It is further preferred in the device according to the invention that the device is designed such that during the punching process the punching punch is moved and the die is stationary, during the cutting process the punching punch is inserted into the die from bottom to top and / or the cover ring is turned in a turning station between rolling up the flange and sealing or gluing the tear-off foil. This makes it possible to convert currently known and established production devices into the device according to the invention with minor modifications to the punching station. The corresponding punching station according to the invention is the subject of the third aspect of the invention, which is still to be explained.

[0043] Preferably, the first conveying device has a first conveying direction and the second conveying device has a second conveying direction, which extends transversely to the first conveying direction, preferably perpendicularly to the first conveying direction. This results in the advantage that the conveying device can be used to discharge the punched blocks directly into the area before or after the production plant.

[0044] A third aspect of the invention relates to a punching station for a device according to the second aspect of the invention for forming a cover ring having a central removal opening surrounded by a sealing flange from a cover blank by punching.

[0045] The punching station comprises a punching tool having a fixed die and a punching punch which, during a predetermined punching operation, operates from below toward the die and thereby moves into the die and simultaneously punches out a punching block.

[0046] The punching station also includes a conveying device which conveys the punching block during a predetermined punching operation by means of compressed air against the force of gravity through the die to a conveying device associated with the punching station in order to remove the punching block from the die area.

[0047] With such a punching station, currently known and established production plants can be converted into a plant according to the invention according to the second aspect of the invention as described at the outset.

[0048] A fourth aspect of the present invention relates to a tear-away lid manufactured or manufacturable using a method according to the first aspect of the present invention. Such a tear-away lid constitutes an important processing mode of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Further embodiments, advantages and applications of the invention are apparent from the dependent claims and from the description which now follows with reference to the drawings. In the drawings:

[0050] Figure 1 A longitudinal section of the cover blank 9 is shown;

[0051] Figures 2 to 4 shows longitudinal sections of the cover ring 8 in various stages of production;

[0052] Figure 5 A longitudinal section of the completed tear-off cover 27 is shown;

[0053] Figure 6 A method for manufacturing a tear-off cover or for implementing the method according to Figures 1 to 5 A schematic side view of a device according to the prior art showing the steps of

[0054] Figures 7a to 7e It is shown that when processing the cover blank according to the prior art Figure 6A longitudinal section transverse to the cover transport direction A of the punching processing station 14 in the mold position of different degrees; and

[0055] Figures 8a to 8e The longitudinal sections transversely to the cover transport direction A show a processing tool of a punching station in the device according to the invention in different advanced tool positions during the processing of a cover blank according to the invention. DETAILED DESCRIPTION

[0056] Reference Figures 1 to 6 The production of the tear-off cover 27 according to the prior art, which is known to a person skilled in the art, is explained. Reference is made here to said explanation in order to avoid repetition.

[0057] The method according to the invention is described below, with reference to known devices and known previously explained production steps as necessary. In particular, also in the device and method according to the invention, the formation of the cover ring 8 from the cover blank 9 and the sealing tearing foil 24 are carried out as already known to the person skilled in the art.

[0058] Figures 7a to 7e The following diagram shows the various degrees of tool position during the processing of a cover blank 9 according to the prior art. Figure 6 The processing mold of the stamping processing station 14.

[0059] As can be seen, the tool comprises an upper tool part 1 with a stamping punch 2 , 3 with a cutting ring 2 and a cutting ring carrier 3 and with a clamping ring 4 , and a lower tool part 5 with a die 6 and a die carrier 7 .

[0060] The upper tool part 1 with the punches 2 , 3 is stationary and the lower tool part 5 with the die 6 works on the upper tool part 1 .

[0061] exist Figure 7a In the mold position shown in , the mold is open and no cover blank 9 is located in the open mold.

[0062] Based on this situation, the cover blank 9 is introduced into the mold in the horizontal direction by means of the conveying device 13 (see Figure 7b ), so that the side which forms the outer side of the cover in the subsequent intended use of the cover to be produced (the intended outer side of the cover) points downward.

[0063] The lower mold part 5 is then moved upwards until the cover blank 9 is clamped between the clamping ring 4 and the die support 7 (see Figure 7c ).

[0064] When the lower tool part 5 is subsequently moved further upward, the clamping ring 4 is moved upward against the force of the compression spring 29 arranged in the upper tool part 1, and the punching punches 2, 3 enter the die 6 (see Figure 7d Here, the punching punch punches the punching projection 16 downwards out of the cover blank 9, which is discharged by gravity conveying via a discharge opening 30 in a base frame 31 of the punching station 14 (see Figure 7d and Figure 7e ).

[0065] If the die 6 reaches the end point of its movement relative to the punch 2, 3, as in Figure 7e As shown in FIG. 1 , the lower mold part 5 moves back to Figure 7a The cover ring 8 which is in the lower position shown in FIG. 1 and has been obtained by the punching process is transported to the next processing station 19 by means of the transport device 13 .

[0066] Figures 8a to 8e The longitudinal section transverse to the cover transport direction A shows the processing tools of the punching processing station in the device according to the invention in the different tool positions when processing the cover blank 9 according to the invention. Figure 6 The devices shown in FIG. 1 differ only in the punching processing station.

[0067] As can be seen, the mold here also comprises a fixed upper mold part 1 and a lower mold part 5 that works towards the upper mold part. Figures 7a to 7e Unlike the punching processing station 14, the upper mold part 1 here has a die 6 and a die support 7, which forms a space 32 above the die 6, and a vacuum or magnetic conveyor belt 33 extends horizontally into the space so that it basically completely covers the upward-pointing opening of the die 6.

[0068] The lower tool part 5 has a stamping punch 2, 3, which comprises a cutting ring 2 and a cutting ring carrier 3, and a clamping ring 4. As can be seen, the cutting ring carrier 3 has an internal air channel 34, which opens into a plurality of outlet openings 35 provided on the upper side of the stamping punches 2, 3.

[0069] exist Figure 8a In the mold position shown in , the mold is open and no cover blank 9 is located in the open mold.

[0070] Based on this situation, the cover blank 9 is introduced into the mold in the horizontal direction by means of the conveying device 13 (see Figure 8b ), so that the side which forms the outer side of the cover in the subsequent intended use of the cover to be produced (the intended outer side of the cover) points downward.

[0071] The lower mold part 5 is then moved upwards until the cover blank 9 is clamped between the clamping ring 4 and the die 6 (see Figure 8c ).

[0072] When the lower tool part 5 is then moved further upward, the punching punch 2 moves out of the clamping ring 4 and enters the die 6, and the clamping ring is located on the die 6 with the clamped cover blank 9. In this case, the punching punch punches the punching boss 16 out of the cover blank 9 upward (see Figure 8d ).

[0073] As soon as the punching punch 2 has reached the end point of its movement relative to the die 6, i.e. the punching punch is at the top dead center of its movement, e.g. Figure 8e As shown in FIG. 1 , the air channels 34 in the punching dies 2, 3 are then momentarily loaded with compressed air. As a result, the punching block 16 is guided through the die 6 to the vacuum or magnetic conveyor belt 33 and then removed from the vacuum or magnetic conveyor belt in a direction B extending transversely to the cover transport direction A from the die area (see FIG. 1 ). Figure 8e ).

[0074] Next, the lower mold part moves back to Figure 8a The cover ring 8 obtained by the punching process is transported to the next processing station 19 by means of the conveying device 13 .

[0075] Although preferred embodiments of the invention have been described in the present application, it is clearly pointed out that the invention is not restricted thereto and may also be embodied in other ways within the scope of the following claims.

Claims

1. A method for manufacturing a tear-off cover (21), A cover ring (8) having a central removal opening (17) is formed by punching a cover blank (9) using a punching die (1, 5) comprising a die (6) and a punching punch (2, 3), wherein the removal opening is surrounded by a sealing flange (18); The edge of the removal opening (17) is formed by pulling out into a flange (20) protruding away from the sealing flange (18) on a predetermined cover inner side of the cover ring (8); Rolling up the flange (20) at its free end; Sealing or gluing the tear-off foil (24) to the sealing flange (18) on the outer side of the specified cover; During the punching process, the punching punch (2, 3) is inserted into the die (6) from bottom to top, the die (6) is arranged on the inner side of a specified cover, and the punching punch (2, 3) is moved into the die (6) from the outer side of the specified cover, punching out a punching block (16) at the same time, and the punching block (16) is conveyed against gravity through the die (6) to a conveying device (33) by means of compressed air, and the punching block is removed from the die area by means of the conveying device.

2. The method according to claim 1, characterized in that The lid blank (9) is made of a ferromagnetic material and the conveying device (33) is a magnetic conveyor belt.

3. The method according to claim 1, characterized in that The lid blank (9) is made of a ferromagnetic material or of a non-ferromagnetic material and the conveying device (33) is a vacuum conveyor belt.

4. The method according to any one of claims 1 to 3, characterized in that Compressed air for conveying the punching block (16) to the conveying device (33) is conveyed through the punching punches (2, 3).

5. The method according to claim 4, characterized in that The compressed air guided through the punching punch (2, 3) is discharged via one or more discharge openings (35) on the side of the punching punch (2, 3) facing the cover blank (9) or the punching block (16).

6. The method according to claim 4, characterized in that The compressed air guided through the punching punch (2, 3) is discharged via a plurality of discharge openings (35) spaced apart from one another on the side of the punching punch (2, 3) facing the cover blank (9) or the punching block (16).

7. The method according to claim 5 or 6, characterized in that Compressed air for conveying the punching block (16) to the conveying device (33) is intermittently provided.

8. The method according to claim 5 or 6, characterized in that Compressed air for conveying the punching block (16) to the conveying device (33) is provided intermittently, so that no compressed air is provided when the punching dies (1, 5) are open and compressed air is provided when the punching dies (1, 5) are closed.

9. The method according to claim 8, characterized in that The compressed air is provided as a momentary pressure surge when the punching die (1, 5) is closed.

10. The method according to claim 7, characterized in that The outlet opening (35) is acted upon with compressed air only at the start of the punching process or only after the punching process is completed.

11. The method according to claim 7, characterized in that The outlet opening (35) is not acted upon with compressed air until the end of the movement of the punch (2, 3) is reached.

12. The method according to any one of claims 1 to 3, characterized in that The flange (20) is rolled up toward the removal opening (17) to form a C-shaped curl or a curved neck curl.

13. The method according to any one of claims 1 to 3, characterized in that The flange (20) is rolled up away from the removal opening (17) to form an inverted C-shaped curl or an inverted neck curl.

14. The method according to any one of claims 1 to 3, characterized in that During the punching process, the punching punch (2, 3) is moved and the die (6) is stationary.

15. The method according to any one of claims 1 to 3, characterized in that The cover ring (8) is turned between rolling up the flange (20) and sealing or gluing the tear-off foil (24).

16. The method according to any one of claims 1 to 3, characterized in that After the punching process, the cover ring (8) is conveyed out of the punching tool (1, 5) in a first transport direction (A) and the punch block (16) is removed from the tool area by means of the conveying device (33) in a second transport direction (B), which extends transversely to the first transport direction (A).

17. The method according to claim 16, characterized in that The second transport direction (B) extends perpendicularly to the first transport direction (A).

18. A device for producing a tear-off lid (27) in which a tear-off foil (24) is sealed or glued on the upper side of the tear-off lid to a sealing surface (18) arranged around a removal opening (17), The device comprises a first conveying device (13) for lid blanks (9), lid rings (8) and tear-off lids (27), and processing stations (14, 19, 21, 25, 26), wherein the processing stations are arranged successively along a first transport direction (A) for processing the lid blanks (9), lid rings (8) and tear-off lids (27). The first processing station (14) is designed to form a cover ring (8) having a central removal opening (17) surrounded by a sealing flange (18) from the cover blank (9) by punching using a punching tool (1, 5) comprising a die (6) and a punching punch (2, 3), The second processing station (19) is designed to form a flange (20) protruding from the cover ring (8), The third processing station (21) is configured to roll up the flange (20), The fourth processing station (25, 26) is designed to seal or glue the tear-off foil (24) onto the sealing flange (18), The first processing station (14) is designed so that during the punching process, the punching punch (2, 3) enters the die (6) from bottom to top, the die (6) is arranged on the inner side of a specified cover, and the punching punch (2, 3) is moved from the outer side of the specified cover into the die (6), and a punching block (16) is punched out at the same time. There is a second conveying device (33) associated with the first processing station (14), by means of which the punching block (16) is removed from the die area during the intended operation of the device. Furthermore, there are devices (34, 35) for conveying the punch block (16) against the force of gravity by means of compressed air through the die (6) to the second conveying device (33).

19. The device according to claim 18, characterized in that The tear-off cover (27) is manufactured according to the method according to any one of claims 1 to 17.

20. The device according to claim 18, characterized in that The second conveying device (33) comprises a magnetic conveying belt or a vacuum conveying belt.

21. The device according to any one of claims 18 to 20, characterized in that The punching punch (2, 3) has one or more air channels (34) for conveying compressed air used in a predetermined operation in order to convey the punching block (16) by means of compressed air through the die (6) to the second conveying device (33).

22. The device according to claim 21, characterized in that The punching punch (2, 3) has one or more outlet openings (35) for compressed air on its side facing the cover blank (9) or the punching block (16).

23. The device according to claim 21, characterized in that The punching punch (2, 3) has, on its side facing the cover blank (9) or the punching block (16), a plurality of outlet openings (35) for compressed air which are spaced equidistantly from one another.

24. The device according to any one of claims 18 to 20, characterized in that The device has a control device, by means of which compressed air for conveying the punching block (16) to the second conveying device (33) is provided or can be provided intermittently during a predetermined operation.

25. The device according to any one of claims 18 to 20, characterized in that The device has a control device, by means of which compressed air for conveying the punching block (16) to the second conveying device (33) is intermittently provided or can be intermittently provided during a specified operation, so that no compressed air is provided when the punching die (1, 5) is open and compressed air is provided when the punching die (1, 5) is closed.

26. The device according to claim 25, characterized in that When the punching die (1, 5) is closed, compressed air is supplied starting from the end point of the movement of the punching punch.

27. The device according to any one of claims 18 to 20, characterized in that The third processing station (21) is designed to roll up the flange (20) toward the removal opening (17).

28. The device according to any one of claims 18 to 20, characterized in that The third processing station (21) is configured to roll the flange (20) toward the removal opening (17) into a C-shaped curl or a curved neck curl.

29. The device according to any one of claims 18 to 20, characterized in that The third processing station (21) is designed to roll up the flange (20) away from the removal opening (17).

30. The device according to any one of claims 18 to 20, characterized in that The third processing station (21) is configured to roll up the flange (20) away from the removal opening (17) to form an inverted C-shaped curl or an inverted neck curl.

31. The device according to any one of claims 18 to 20, characterized in that The first processing station (14) is designed such that during the punching process the punches (2, 3) are moved and the die (6) is stationary.

32. The device according to any one of claims 18 to 20, characterized in that A deflection station (23) is provided between the third processing station (21) and the fourth processing station (25, 26) for deflecting the cover ring (8).

33. The device according to any one of claims 18 to 20, characterized in that The first conveying device has a first transport direction (A) and the second conveying device (33) has a second transport direction (B), which extends transversely to the first transport direction (A).

34. The device according to claim 33, characterized in that The second transport direction (B) extends perpendicularly to the first transport direction (A).

35. A punching station for an apparatus according to any one of claims 18 to 34, for forming a cover ring (8) having a central removal opening (17) from a cover blank (9) by punching, the removal opening being surrounded by a sealing flange (18), the punching station comprising: a) a punching die (1, 5), the punching die having a fixed die (6) and a punching punch (2, 3) which, during a predetermined punching operation, acts on the die (6) from below and is inserted into the die (6) while punching out a punching block (16); b) a device (34, 35) for conveying the punching block (16) during a predetermined punching operation by means of compressed air against the force of gravity through the die (6) to a conveying device (33) associated with the punching station, in order to remove the punching block (16) from the die area.

Images