EP3808552B1 - Verfahren und vorrichtung zur herstellung von mikroperforierten aluminiumschalen für lebensmittel - Google Patents

Verfahren und vorrichtung zur herstellung von mikroperforierten aluminiumschalen für lebensmittel Download PDF

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Publication number
EP3808552B1
EP3808552B1 EP19425073.4A EP19425073A EP3808552B1 EP 3808552 B1 EP3808552 B1 EP 3808552B1 EP 19425073 A EP19425073 A EP 19425073A EP 3808552 B1 EP3808552 B1 EP 3808552B1
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EP
European Patent Office
Prior art keywords
needles
strip
station
plate
aluminum foil
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Active
Application number
EP19425073.4A
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English (en)
French (fr)
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EP3808552C0 (de
EP3808552A1 (de
Inventor
Leopoldo Ceppaluni
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Cuki Cofresco Srl
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Cuki Cofresco Srl
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Priority to EP19425073.4A priority Critical patent/EP3808552B1/de
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Publication of EP3808552C0 publication Critical patent/EP3808552C0/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/59—Shaping sheet material under pressure
    • B31B50/592—Shaping sheet material under pressure using punches or dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B50/142—Cutting, e.g. perforating, punching, slitting or trimming using presses or dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B50/16—Cutting webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • B21D31/02—Stabbing or piercing, e.g. for making sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2100/00—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs
    • B31B2100/002—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs characterised by the shape of the blank from which they are formed
    • B31B2100/0024—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs characterised by the shape of the blank from which they are formed having all side walls attached to the bottom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2110/00—Shape of rigid or semi-rigid containers
    • B31B2110/10—Shape of rigid or semi-rigid containers having a cross section of varying size or shape, e.g. conical or pyramidal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2110/00—Shape of rigid or semi-rigid containers
    • B31B2110/20—Shape of rigid or semi-rigid containers having a curved cross section, e.g. circular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/26—Folding sheets, blanks or webs
    • B31B50/44—Folding sheets, blanks or webs by plungers moving through folding dies

Definitions

  • the present invention relates to a method and to an apparatus for manufacturing microperforated aluminum trays for foodstuff.
  • disposable trays made of aluminum foil are widely used for baking foods such as cakes, lasagna, puff pastries, and the like.
  • the above disposable trays are conventionally manufactured in series starting from an aluminum foil, which is molded between a male mold and a female mold into the final concave shape of a tray.
  • a typical aluminum tray may have a substantially flat bottom with a circular or rectangular profile, and a slightly flared peripheral wall having an upper cantilever edge, which is bent outwards parallel to the bottom and terminates with a curled, cut-safe frame.
  • Trays are also known which are provided with microperforations in order to improve the baking process and make it faster.
  • GB 2418907 A discloses a known process for manufacturing microperforated trays, which differs from the conventional one in that the aluminum foil, before the molding process, passes between a couple of counter-rotating, perforating cylinders pressed against each other, which engage the aluminum foil for the entire width thereof.
  • One of the cylinders is provided with small needles which are uniformly distributed over its entire surface, while the other cylinder is made of a yielding material in order to allow the needles to fully penetrate the aluminum foil.
  • the microperforations are distributed over the entire surface of the tray, i.e., the bottom, the peripheral wall, the cantilever edge and the curled, cut-safe frame.
  • small flakes or fragments of aluminum generated during the perforation, particularly in the area of the curled, cut-safe frame, may remain attached to the surface of the tray. In use, such flakes or fragments may detach from the material of the tray and pollute the food contained therein.
  • the microperforations on the curled, cut-safe frame make its surface rough and its shape uneven.
  • the aforementioned roughness and unevenness of the curled, cut-safe frame can compromise the correct unstacking of the trays during certain steps of the production process and packaging process.
  • the micro-perforations in the area of the curled, cut-safe frame may generate sharp spikes that can hurt the user.
  • the aim of the present invention is to provide a method and an apparatus for manufacturing microperforated aluminum trays for foodstuff, which allow the drawbacks of the known solutions to be overcome particularly in relation to the weakening of the tray determined by the microperforations, to the possible pollution of the foodstuff by flask or fragments of aluminum detaching from the tray, to the complications in the production process and packaging process deriving from the presence of microperforations particularly in the area of the curled, cut-safe frame, as well as to the undesired sharp spikes which may be generated by the micro-perforation particularly in the area of the curled, cut-safe frames.
  • an object of the invention is to provide a method and an apparatus which can be easily applied to existing lines for production of conventional (i.e., non-perforated) aluminum trays for foodstuff.
  • microperforated aluminum trays are manufactured in series starting from a strip 10 of aluminum foil.
  • the strip 10 is continuously unrolled from a roll 12 and delivered to a molding station 14, where a portion P of aluminum foil is separated from the strip 10 and molded into the final concave shape of a tray.
  • the molding station 14 is conventionally provided with a lower male mold 16 and an upper female mold 18, between which the portion P of aluminum foil is pressed.
  • the male mold 16 and the female mold 18 are generally configured in such a way as to generate a tray 20 which is shaped as illustrated in Fig. 7 .
  • the tray 20 has a substantially flat bottom 22 with a circular profile, and a slightly flared peripheral wall 24 having an upper cantilever edge 26 which is bent outwards substantially parallel to the bottom 22 and terminates with a cut-safe curled frame 28.
  • the strip 10 is continuously unrolled from the roll 12.
  • a swinging tensioner roller 30 is conventionally arranged downstream of roll 10 between two idle guiding rollers 32, 34, for temporarily storing the material unrolled in excess during the molding cycle, and then returnig it for the next cycle upon request from a pair of motorized feeding rollers 36, 38 which are intermittently operated in synchronism with the molding station 14.
  • a perforating station 40 arranged between the tensioner roller 30 and the molding station 14 is adapted to perforate the strip 10 with microperforations before the molding process.
  • the strip 10 in the perforating station 40 is intermittently punched, in synchronism with the operation of the molding station 14, at a desired region R - e.g., the region which will constitute the bottom of the tray - between a punching plate 42 provided with a plurality of needles 44 and a counter plate 46 suitable to be passed through by the needles 44, the pitch between two consecutive perforated regions R, as determined by the above intermittent punching action, corresponding to the length of one portion P of aluminum foil which is used for producing one tray or to a multiple thereof.
  • the pitch corresponds to the length of one portion P
  • all the trays output from the apparatus according to the invention will be perforated in the desired region R. If the pitch corresponds to a multiple of the length of one portion P, the perforated trays will alternate with one or more non-perforated trays, depending on the multiplying factor.
  • the counter plate 46 is made of a rigid material and is provided with a plurality of holes 48 aligned to the needles 44.
  • the counter plate 46 could be made of a yielding material suitable to be perforated by the needles 44.
  • the perforating station 40 is arranged at a predetermined distance from the molding station 14, which substantially corresponds to the length of one portion P of aluminum foil which is used for producing one tray or to a multiple thereof. As a result, at the same time as a downstream portion of the strip 10 is separated and molded in the molding station 14, an upstream portion is punched in the perforating station 40.
  • the perforating station 40 comprises a frame 50 provided with a horizontal bottom plate 52 and with a horizontal roofing plate 54 which are interconnected by adjustable columns such as 56, e.g., four columns.
  • the punching plate 42 is supported by the bottom plate 52, and is provided with a plurality of through holes 58 for receiving the needles 44.
  • the entire surface of the punching plate 42 is provided with through holes 58, so that the needles 44 can be inserted only in those through holes 58 which define a pattern corresponding to the desired region R to be perforated. For instance, if the region R to be perforated is the bottom of a tray having a circular profile (as shown in Fig. 7 ), the needles 44 should have a disc-shaped arrangement as shown in Fig. 6 ; if the region to be perforated is the peripheral wall of the same tray, the needles 44 should have an annular arrangement, and so on.
  • the above feature improves the flexibility of the system, allowing the perforation to be easily customized based on the circumstances, e.g., depending on the shape of the tray, on the desired effect of the perforations on the baking process, and the like.
  • the needles 44 are provided with tips 44a protruding upwards from the punching plate 42 and, at their opposite ends, with enlarged heads 44b.
  • the needles 44 are retained in the respective through holes 58 by a blocking plate 60 which is sandwiched between the bottom plate 52 and the punching plate 42 and abuts against the enlarged heads 44b.
  • the tips 44a have an elongated tapered profile ( Fig. 5 ) - preferably an elongated conical profile - for the scopes that will be described in more detail below.
  • the needles 44 may be 0.3 to 2.5 mm in diameter, more preferably 1.2 mm.
  • a pressing plate 62 is supported by the punching plate 42 in front of the counter plate 46 via first elastic means, preferably, a series of first compression springs 64, and is provided with a plurality of through openings 65 which are aligned to the needles 44 and can be passed through by the latter.
  • first elastic means preferably, a series of first compression springs 64
  • the counter plate 46 is supported by a pair of vertical rods 66 which are slidably received in respective guiding bores 68 of the roofing plate 54.
  • the vertical rods 66 are provided with enlarged terminals 70 at their upper ends, which define the lowermost stroke end for the counter plate 46.
  • Sets of spacers 72 are fitted on vertical rods 66, between the enlarged terminals 70 and the roofing plate 54, in order to reduce the downward stroke of the counter plate 46 with respect to the above-mentioned lowermost stroke end, for the scopes that will be disclosed in more detail below.
  • the counter plate 46 which is normally biased to its uppermost position by second elastic means, can be pushed downwards by a set of pneumatic actuators 74, e.g., three actuators, which are functionally arranged between the counter plate 46 and the roofing plate 54.
  • a set of pneumatic actuators 74 e.g., three actuators, which are functionally arranged between the counter plate 46 and the roofing plate 54.
  • the second elastic means preferably comprise a series of second compression springs 76, which are fitted on respective vertical guiding bars 78 that are slidably inserted in respective through holes 80 of the roofing plate 54.
  • the guiding bars 78 have a threaded lower end 78a which is screwed to the counter plate 48 and an enlarged upper end 78b, the second compression springs 76 being operatively arranged between the enlarged upper end 78b and the roofing plate 54 in such a way as to bias the counter plate 46 upwards.
  • control unit CU Fig. 1
  • the programming of control unit CU falls within the normal knowledge of the person skilled in the art and, therefore, will be no discussed in more detail herein.
  • the strip 10 is unrolled from the roll 12 and delivered to the molding station 14, where a portion P of aluminum foil is separated from the strip 10 and molded into a tray, in a way known per se.
  • the upstream material that is unrolled in excess is temporarily stored by the tensioner roller 30, in order to be returned in the next cycle upon request from the feeding rollers 36, 38.
  • the counter plate 42 is driven to move with respect to the punching plate 42 with a reciprocating motion synchronized with the operation of the molding station 14.
  • the counter plate 46 is pushed against the pressing plate 62 by the pneumatic actuators 74, with the strip 10 that remains sandwiched between the counter plate 46 and the pressing plate 62 ( Fig. 3 ). Then, the counter plate 46 continues its downward stroke and pushes the pressing plate 62 towards the punching plate 42, against the action of the first compression springs 64. As a result, the tips 44a of the needles 44 enter the through openings 64 of the pressing plate 62 and finally emerge from the upper surface of the latter, thereby perforating the aluminum foil in the desired region R ( Fig. 4 ).
  • the diameter of the perforations may be adjusted by varying the depth of penetration of the needles into the aluminum foil.
  • the depth of penetration is determined by the end of the downward punching stroke of the counter plate 46, which, in turn, may be adjusted by varying the number/thickness of spacers 72 fitted on the vertical rods 66. For instance, with needles 1.2 mm in diameter, the diameter of the perforations may be easily adjusted between 0.2 and 1.20 mm.
  • the method and the apparatus according to the invention in compliance with another stated aim, can be easily applied to existing lines for production of conventional (i.e., non-perforated) aluminum trays for foodstuff, by simply adding a perforating station as described above.
  • the diameter of the perforations can be adjusted easily and quickly, without requiring a long stop of the production line, by simply varying the number/thickness of spacers which determine the end of the punching stroke.
  • the shape of the perforated region may be varied depending, e.g., on the profile of the tray and/or on the desired effect of the perforations on the baking process.
  • a corresponding rectangular region of the aluminum foil can be perforated.
  • the peripheral wall can be partially or entirely perforated, by an alternative or added set of needles arranged in such a way as to perforate a region of the aluminum foil which surrounds the area of the bottom of the tray.
  • the spacers may be replaced by an annular flange acting as a mechanical stop, which can be fixed to the vertical rod at a predetermined level, e.g., by means of a set screw.
  • the pneumatic actuators may be replaced by electric actuators controlled by position in closed loop or open loop, e.g., electric servo drives.

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  • Making Paper Articles (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (9)

  1. Ein Verfahren zur Herstellung mikroperforierter Aluminiumschalen für Lebensmittel, das folgende Schritte umfasst:
    - in einer Perforierstation (40), das Perforieren eines Streifens (10) Aluminiumfolie, der von einer Spule (12) abgewickelt wird, mit einer Vielzahl von Mikroperforationen,
    - in einer Formstation (14), das Abtrennen eines Abschnitts (P) von Aluminiumfolie von dem Streifen (10), der von der Perforierstation (40) ausgegeben wird, und das Formen desselben zu einer Schale (20),
    dadurch gekennzeichnet, dass der Streifen (10) in der Perforierstation (40) intermittierend, synchron mit dem Betrieb der Formstation (14), in einem gewünschten Bereich (R) zwischen einer Stanzplatte (42), die mit einer Vielzahl von Nadeln (44) ausgestattet ist, und einer Gegenplatte (46) gestanzt wird, die geeignet ist, um von den Nadeln (44) durchquert zu werden; wobei der Abstand zwischen zwei aufeinander folgenden perforierten Bereichen (R), bestimmt durch die intermittierende Stanzarbeit, der Länge des Abschnitts (P) oder einem Vielfachen davon entspricht.
  2. Das Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, dass der Streifen (10) in einem vordefinierten Abstand von der Formstation (14) gestanzt wird, der im Wesentlichen der Länge des Abschnitts (P) von Aluminiumfolie oder einem Vielfachen davon entspricht, wobei zu demselben Zeitpunkt, zu dem ein stromabwärts gelegener Abschnitt des Streifens (10) in der Formstation (14) abgetrennt und geformt wird, ein stromaufwärts gelegener Abschnitt in der Perforierstation (40) gestanzt wird.
  3. Das Verfahren gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Streifen (10), bevor er von der Stanzplatte (42) perforiert wird, zwischen der Gegenplatte (46) und einer Druckplatte (62) gepresst wird, die von der Stanzplatte (42) vor der Gegenplatte (46) über erste elastische Mittel (64) gelagert und mit einer Vielzahl von Durchgangsöffnungen (65) versehen ist, welche mit den Nadeln (44) ausgerichtet sind und von Letzteren durchdrungen werden können.
  4. Das Verfahren gemäß einem beliebigen der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Nadeln (44) mit Spitzen (44a) versehen sind, die ein lang gestrecktes spitz zulaufendes Profil haben, wobei die Größe der Perforationen folglich durch Verändern der Eindringtiefe der Nadeln in die Aluminiumfolie anpassbar ist.
  5. Eine Vorrichtung zur Herstellung mikroperforierter Aluminiumschalen für Lebensmittel, die Folgendes umfasst:
    - eine Perforierstation (P), die ausgebildet ist, um einen Streifen (10) Aluminiumfolie, der von einer Spule (12) abgewickelt wird, mit einer Vielzahl von Mikroperforationen zu perforieren,
    - eine Formstation (14), die ausgebildet ist, um einen Abschnitt (P) von Aluminiumfolie von dem Streifen (A) abzutrennen, der von der Perforierstation (40) ausgegeben wird, und ihn zu einer Schale (20) zu formen,
    dadurch gekennzeichnet, dass die Perforierstation (40) eine Stanzplatte (42) umfasst, die mit einer Vielzahl von Nadeln (44) ausgestattet ist, und eine Gegenplatte (46), geeignet, von den Nadeln (44) durchquert zu werden; wobei mindestens eine davon angetrieben ist, um sich mit Bezug auf die andere entlang einem Stanzhub zu bewegen, mit einer Hin- und Herbewegung, die mit dem Betrieb der Formstation (14) synchronisiert ist, derart, dass der Streifen (10) in einem gewünschten Bereich (R) gestanzt wird; wobei der Abstand zwischen zwei aufeinander folgenden perforierten Bereichen (R), wie er durch die Hin- und Herbewegung bestimmt wird, der Länge des Abschnitts (P) oder einem Vielfachen davon entspricht.
  6. Die Vorrichtung gemäß Anspruch 5, dadurch gekennzeichnet, dass die Perforierstation (40) in einem vordefinierten Abstand von der Formstation (14) angeordnet ist, der im Wesentlichen der Länge des Abschnitts (P) von Aluminiumfolie oder einem Vielfachen davon entspricht.
  7. Die Vorrichtung gemäß Anspruch 5 oder 6, dadurch gekennzeichnet, dass sie eine Druckplatte (62) umfasst, die von der Stanzplatte (42) vor der Gegenplatte (46) über erste elastische Mittel (64) gelagert und mit einer Vielzahl von Durchgangsöffnungen (65) versehen ist, welche mit den Nadeln (44) ausgerichtet sind und von Letzteren durchdrungen werden können, wobei der Streifen (10), bevor er von der Stanzplatte (42) perforiert wird, zwischen der Gegenplatte (46) und der Druckplatte (62) gepresst wird.
  8. Die Vorrichtung gemäß einem beliebigen der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass die Nadeln (44) mit Spitzen (44a) versehen sind, die ein lang gestrecktes spitz zulaufendes Profil haben, und dadurch, dass Anpassungsmittel (72) bereitgestellt sind, um die Eindringtiefe der Nadeln (44) in die Aluminiumfolie und folglich die Größe der Perforationen zu verändern.
  9. Die Vorrichtung gemäß Anspruch 8, dadurch gekennzeichnet, dass sie einen Satz von Abstandselementen (72) umfasst, die ausgebildet sind, um den Stanzhub zu begrenzen.
EP19425073.4A 2019-10-17 2019-10-17 Verfahren und vorrichtung zur herstellung von mikroperforierten aluminiumschalen für lebensmittel Active EP3808552B1 (de)

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Application Number Priority Date Filing Date Title
EP19425073.4A EP3808552B1 (de) 2019-10-17 2019-10-17 Verfahren und vorrichtung zur herstellung von mikroperforierten aluminiumschalen für lebensmittel

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EP19425073.4A EP3808552B1 (de) 2019-10-17 2019-10-17 Verfahren und vorrichtung zur herstellung von mikroperforierten aluminiumschalen für lebensmittel

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EP3808552A1 EP3808552A1 (de) 2021-04-21
EP3808552C0 EP3808552C0 (de) 2023-11-15
EP3808552B1 true EP3808552B1 (de) 2023-11-15

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CN115055370B (zh) * 2022-07-27 2024-03-01 稷山县森晟选煤科技有限公司 一种合金筛网生产制造加工设备

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3608413A (en) * 1969-09-11 1971-09-28 Domenic Borello Hole punching die arrangement
HU217883B (hu) * 1994-12-23 2000-04-28 Depron B.V. Eljárás és berendezés nyitottcellás műanyag habfóliák sík zárt felületének perforálására
GB2418907A (en) * 2004-10-06 2006-04-12 Nicholl Food Packaging Ltd Perforated metal foil container and apparatus and method for making same
EP2179824A1 (de) * 2008-10-23 2010-04-28 Wardenburg Malgo Engineering B.V. Vorrichtung zum Stanzen von Mikroperforationsreihen in Folienmaterial
WO2015009518A1 (en) * 2013-07-19 2015-01-22 Meadwestvaco Corporation Sealable paperboard container and method for manufacturing the same

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EP3808552A1 (de) 2021-04-21

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