EP4116002A1 - Verfahren zur gemeinsamen herstellung eines zinnbehälters und dessen deckel mit einer abnehmbaren zentralen membran - Google Patents

Verfahren zur gemeinsamen herstellung eines zinnbehälters und dessen deckel mit einer abnehmbaren zentralen membran Download PDF

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Publication number
EP4116002A1
EP4116002A1 EP20725589.4A EP20725589A EP4116002A1 EP 4116002 A1 EP4116002 A1 EP 4116002A1 EP 20725589 A EP20725589 A EP 20725589A EP 4116002 A1 EP4116002 A1 EP 4116002A1
Authority
EP
European Patent Office
Prior art keywords
lid
ring
central membrane
tin container
pressing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20725589.4A
Other languages
English (en)
French (fr)
Inventor
José Manuel MECA GÓMEZ
Juan Jesús GARCÍA AYLLÓN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Auxiliar Conservera SA
Original Assignee
Auxiliar Conservera SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Auxiliar Conservera SA filed Critical Auxiliar Conservera SA
Publication of EP4116002A1 publication Critical patent/EP4116002A1/de
Pending legal-status Critical Current

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Classifications

    • 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
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/44—Making closures, e.g. caps
    • 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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/16—Additional equipment in association with the tools, e.g. for shearing, for trimming
    • 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
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • 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
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/44—Making closures, e.g. caps
    • B21D51/443—Making closures, e.g. caps easily removable closures, e.g. by means of tear strips

Definitions

  • the present invention relates to the technical field of metal containers, specifically tin containers and their lids, and more specifically lids referred to as easy-to-open, which open without the need for tools.
  • the invention specifically relates to jointly manufacturing tin containers and their lids made with a detachable central membrane, known as peel-off lids.
  • the lid is usually made of tin sheet, although it can be made of different materials such as aluminum, and adopting different shapes such as circular, rectangular, oval, etc.
  • Containers with easy-to-open lids with a detachable central membrane also known as peel-off lids, have gained importance in recent years. Lids of this type are formed by an external ring permanently attached to the container, and a central membrane or sheet heat sealed to this ring and blocking the central space, easily detachable by means of a strip or tab.
  • This central membrane or sheet is usually made of aluminum, although it can also be made of plastic and/or another metal.
  • a method for manufacturing a lid with a central membrane or detachable or peel-off sheet in an efficient manner is desirable, saving material and being environmentally friendly, which avoids drawbacks existing in earlier systems of the state of the art, and furthermore at the same time obtains the container complementary to said lid.
  • the present invention solves the problems existing in the state of the art by means of a method for jointly manufacturing a tin container and its lid with a detachable central membrane, conventionally known as a peel-off lid.
  • the method has a first step of pressing a sheet metal in which a cylindrical body having a closed lower base and an open upper part is obtained as a result of the operation by means of at least one press.
  • the sheet metal must have sufficient dimensions to meet the diameter and height required for the container.
  • the lid and the container After pressing, different operations are performed to form both the lid and the container, mainly a step of trimming the upper part of the cylindrical body and separating said upper part.
  • the remaining cylindrical body generates a tin container, while the separated upper part generates a ring complementary to said container.
  • the ring includes a central space and an internal edge demarcating the central space.
  • a circumferential rim is formed in the open upper part, and the ring generated in the step of trimming the upper part further comprises said circumferential rim, in turn having an external edge.
  • a step of trimming excess material from the circumferential rim could optionally be performed in a trimming station, for removing the irregular edges that are always left after a process of pressing, and leaving an external edge of the circumferential rim in perfect condition.
  • the circumferential rim is not formed in the first step of pressing, but rather in the ring generated in the step of trimming the upper part, which likewise has an external edge.
  • a step of trimming excess material from said circumferential rim could optionally be performed in a trimming station for removing the irregular edges and leaving an external edge of the circumferential rim in perfect condition.
  • a stepping operation with a step being obtained around the central space, for supporting and sealing a central membrane configured for closing the central space (peel-off lid), and flanging and bending operations in the ring for removing sharp ridges and closing edges.
  • a layer of lacquer with propylene can be applied to the sheet metal to provide the later heat sealing of the central membrane to the central space of the ring.
  • lacquer without propylene can be applied only to make machining of the sheet easier, and later once the ring is formed, before fixing the central membrane, applying polypropylene only to said ring to perform the heat sealing of the central membrane.
  • a plastic sheet before the step of pressing, can be applied to the sheet metal, said plastic sheet being what later provides the heat sealing of the central membrane.
  • the step of pressing can be performed either in a single phase or else in two different phases.
  • pressing should be performed in two different phases so as to achieve less drawing of the material and obtain a smoother surface, which makes a later operation for applying images in said container by lithography or stamping easier.
  • a shape and specific recess can be provided to the closed lower base of the cylindrical body, which will constitute the base of the container.
  • the step is made in the step of pressing, before the step of trimming the upper part of the cylindrical body. This provides the advantage of needing less material, about 9 % less material, and furthermore the lid is formed with one less operation.
  • the trimming of the upper part of the cylindrical body would be performed, with the ring being obtained, and then bending of the external edge of the circumferential rim of the ring is performed, with said bending generating a channel.
  • the step is made before trimming the upper part of the cylinder, making the step implies a reduction in diameter affecting the container, therefore once the upper part of the cylindrical body has been trimmed, said cylindrical body would have to be expanded in an expander to increase its diameter up to the nominal diameter of the container. Once this expansion is performed, the upper rib would be made in the container and the bottom or base of the container if it had not been made during the step of pressing.
  • the step is not made during the step of pressing, but rather after that, once the trimming of the upper part of the cylindrical body is performed directly with respect to the ring obtained.
  • This second option provides the advantage that in this case the container would not have to be expanded as it does in the preceding option, and more standard, less special materials can also be used.
  • the container would not have to be expanded, therefore directly making the upper rib in said container and the bottom or base of the container if it had not been made during the step of pressing.
  • the container and the ring complementary to same are completely formed, and said ring is arranged for receiving gumming of the channel, which provides a leak-tight closure of the container with its lid, as a result of which the gumming forms a sealing gasket in the closure.
  • a pressed capsule from which the upper part is trimmed in a later process is manufactured by means of the new method.
  • This upper part is formed to produce a ring to which a sheet of aluminum is later heat sealed.
  • the lower part is formed to produce a pressed container.
  • the container and the lid complementary to same are obtained with the same cylindrical body. Therefore, a detachable central membrane lid, or peel-off lid, is obtained with the opening already made and a surface on the outer ring arranged for heat sealing, not from a conventional lid with its subsequent unusable metal, but rather from another completely different process where a ring is formed, without wastage.
  • the opening is not made in a disc-shaped material for obtaining a ring, but rather a ring is obtained directly from another manufacturing process.
  • the main advantage of the method object of the present invention is that since the center of the lid does not have to be trimmed from already existing sheet, waste is not generated. That is, to make the same product (a peel-off lid), less raw material is used and less waste is generated, with the subsequent benefits this entails, that is, economic benefits, environmental benefits, etc.
  • Peel-off lids are an interesting alternative for many packaging solutions, beyond the metal container. It is very appealing due to the convenience and safety for the consumer, but at present it conflicted with environmental sustainability, due to the enormous waste of material (about 32 %) produced in the manufacture thereof. Therefore, with the new method of manufacture object of the present invention, a 32 % savings in materials presents an indisputable not only environmental but also economic advantage.
  • the novelty and inventive step of the method object of the present invention is that it completely changes the process of manufacturing the two-piece container for obtaining the metal, already in the form of a ring, needed to form the lid with the surface needed for being closed on the container and for heat sealing the detachable sheet. That is, the two elements to be attached, lid and container, are obtained in the same process. This is a radical change to the concept of manufacture by greatly reducing the cost.
  • Packing entities and users of this lid can continue to use the same container closing equipment in their factories without speed limitations compared to other solutions which, while dispensing with the cost of the lid by allowing heat sealing in the container directly, are severely penalized by the operating speed and loss of efficacy.
  • the object of the present invention is a method for jointly manufacturing a tin container 6 and its lid 15 with a detachable central membrane, conventionally known as a peel-off lid 15.
  • the present method has a first step of pressing a sheet metal 1 in which a cylindrical body 2 having a closed lower base 3 or bottom and an open upper part 4 is obtained as a result of the operation by means of at least one press.
  • the remaining cylindrical body 2 thus generates the tin container 6, while the separated upper part 4 generates a ring 7 complementary to said container 6.
  • the ring 7 includes a central space 8 and an internal edge 12 demarcating the central space 8, as can be observed in the figures.
  • a circumferential rim 5 is formed in the open upper part 4, and the ring 7 generated in the step of trimming the upper part 4 further comprises said circumferential rim 5, in turn having an external edge 11.
  • Figures 1a-1b , 2a-2b and 6a-6b show the output of this step of pressing.
  • a step of trimming excess material from the circumferential rim 5 could optionally be performed in a trimming station, for removing the irregular edges that are always left after a pressing process, and leaving an external edge 11 of the circumferential rim 5 in perfect condition.
  • the circumferential rim 5 is not formed in the first step of pressing, but rather in the ring 7 generated in the step of trimming the upper part 4, which likewise has an external edge 11.
  • a step of trimming excess material from said circumferential rim 5 could optionally be performed in a trimming station for removing the irregular edges and leaving an external edge 11 of the circumferential rim 5 in perfect condition.
  • a stepping operation which generates a step 9 around the central space 8, for supporting and sealing a central membrane 10 configured for closing the central space 8, and flanging and bending operations in the ring 7 for removing sharp ridges and closing edges.
  • a layer of lacquer with propylene can be applied to the sheet metal 1 to provide the later heat sealing of the central membrane 10 to the central space 8 of the ring 7.
  • lacquer without propylene can be applied only to make machining of the sheet easier, and later once the ring 7 is formed, before fixing the central membrane 10, applying polypropylene only to said ring 7 to perform the heat sealing of said central membrane 10.
  • a plastic sheet before the step of pressing, can be applied to the sheet metal 1, said plastic sheet being what later provides the heat sealing of the central membrane 10.
  • the step of pressing can be performed either in a single phase or else in two different phases.
  • pressing should be performed in two different phases so as to achieve less drawing of the material and obtain a smoother surface, which makes a later operation for applying images in said container 6 by lithography or stamping easier.
  • a shape and specific recess can be provided to the closed lower base 3 of the cylindrical body 2, which will constitute the base of the container 6.
  • the step 9 is made during the step of pressing, before the step of trimming the upper part 4 of the cylindrical body 2.
  • Figures 2a-2b , 3a-3b , 4a-4d , 5a-5c specifically refer to this first option.
  • step 9 is made before trimming the upper part 4 of the cylindrical body 2, making the step 9 implies a reduction in diameter affecting container 6, therefore once the upper part 4 of the cylindrical body 2 has been trimmed, said cylindrical body 2 would have to be expanded in an expander to increase its diameter up to the nominal diameter of the container. Once this expansion is performed, the upper rib would be made in the container 6 for the later attachment of the lid 15, and the bottom or base 3 of the container if it had not been made during the step of pressing.
  • the step 9 is not made during the step of pressing, but rather after that, once trimming the upper part 4 of the cylindrical body 2 is performed, i.e., directly in the ring 7 obtained.
  • Figures 6a-6b , 7a-7b , 8a-8d , 9a-9c , 10a-10c refer to this second option.
  • the container 6 would not have to be expanded, therefore directly making the upper rib in said container 6 and the bottom or base 3 of the container if it had not been made during the step of pressing.
  • the container 6 and the ring 7 complementary to same are completely formed, and said ring 7 is arranged for receiving gumming of the channel 13, which provides a leak-tight closure of the container with its lid, since the gumming acts as a sealing gasket.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
EP20725589.4A 2020-03-04 2020-03-04 Verfahren zur gemeinsamen herstellung eines zinnbehälters und dessen deckel mit einer abnehmbaren zentralen membran Pending EP4116002A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ES2020/070155 WO2021176112A1 (es) 2020-03-04 2020-03-04 Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible

Publications (1)

Publication Number Publication Date
EP4116002A1 true EP4116002A1 (de) 2023-01-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20725589.4A Pending EP4116002A1 (de) 2020-03-04 2020-03-04 Verfahren zur gemeinsamen herstellung eines zinnbehälters und dessen deckel mit einer abnehmbaren zentralen membran

Country Status (2)

Country Link
EP (1) EP4116002A1 (de)
WO (1) WO2021176112A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023169659A1 (de) 2022-03-08 2023-09-14 Soudronic Ag Verpackung aus blechmaterial mit aufreissfoliendeckel sowie materialset und verfahren zu deren herstellung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4262510A (en) * 1979-07-11 1981-04-21 American Can Company Support pedestals
DE19625174B4 (de) * 1996-06-24 2008-05-15 IMPRESS Metal Packaging S.A., Crosmières Deckelringfertigung ohne Rondenverschnitt
DE19837779A1 (de) * 1998-08-20 2000-03-02 Vaw Ver Aluminium Werke Ag Verfahren zur Herstellung eines verschließbaren Behälters
MXPA04001865A (es) * 2002-06-05 2005-03-07 Ind Penalver Sl Maquina rebordeadora-engomadora de tapas metalicas de geometria no circular para envases.
EP1375025A1 (de) * 2002-06-27 2004-01-02 Alcan Technology & Management AG Verfahren zur Herstellung eines Dosenkörpers und eines Deckelringes

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Publication number Publication date
WO2021176112A1 (es) 2021-09-10

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