WO2021176112A1 - Method for jointly manufacturing a tin container and its lid with a detachable central membrane - Google Patents

Method for jointly manufacturing a tin container and its lid with a detachable central membrane Download PDF

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Publication number
WO2021176112A1
WO2021176112A1 PCT/ES2020/070155 ES2020070155W WO2021176112A1 WO 2021176112 A1 WO2021176112 A1 WO 2021176112A1 ES 2020070155 W ES2020070155 W ES 2020070155W WO 2021176112 A1 WO2021176112 A1 WO 2021176112A1
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WO
WIPO (PCT)
Prior art keywords
lid
ring
container
central membrane
joint manufacturing
Prior art date
Application number
PCT/ES2020/070155
Other languages
Spanish (es)
French (fr)
Inventor
José Manuel MECA GÓMEZ
Juan Jesús GARCÍA AYLLÓN
Original Assignee
Auxiliar Conservera S.A.
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 S.A. filed Critical Auxiliar Conservera S.A.
Priority to EP20725589.4A priority Critical patent/EP4116002A1/en
Priority to PCT/ES2020/070155 priority patent/WO2021176112A1/en
Publication of WO2021176112A1 publication Critical patent/WO2021176112A1/en

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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 belongs to the technical field of metal containers, specifically tin containers and their lids, and more specifically so-called easy-open lids, which are opened without the need for tools.
  • the invention relates to the joint manufacture of tin cans and their lids made with a removable central membrane, known as "peel-off" lids.
  • lids In the case of containers used for so-called easy-open food products, the lid of these is usually made of tin, although they can be made of different materials such as aluminum, and adopt different shapes such as circular, rectangular, oval, etc.
  • containers with easy-open lids with a removable central membrane also known as "peel-off" lids, have gained great importance.
  • This type of lids is made up of an external ring permanently attached to the container, and a central membrane or sheet heat-sealed to this ring and that closes the central hole, easily removable by means of a strip or ring.
  • This membrane or central sheet is usually made of aluminum, although it can also be made of plastic and / or other metal.
  • the present invention solves the problems existing in the state of the art by means of a joint manufacturing method of the tin container and its lid with a central detachable membrane, conventionally known as a "peel-off" lid.
  • the method presents a first stage of drawing into a metal sheet, in which, by means of at least one press, a cylindrical body having a closed lower base and an open upper part is obtained as a result of the operation.
  • the metal sheet must have sufficient dimensions to meet the diameter and height required for the container.
  • a circumferential flange is formed in the open upper part, and the ring originated in the step of trimming the upper part additionally comprises said circumferential flange, which it also has an outer edge.
  • a step of trimming the excess material of the circumferential wing could be carried out in a trimming station, to eliminate the irregular edges that always remain after a drawing process, and leave a perfect outer edge of the circumferential wing.
  • the circumferential wing is not formed in the first drawing stage, but in the ring originated in the upper part cutting stage, which also has an external edge.
  • a step of trimming the excess material from said circumferential flange could be carried out in a trimming station, to eliminate the irregular edges and leave a perfect circumferential flange outer edge.
  • a step operation is also carried out, obtaining a step around the central gap, for the support and sealing of a central membrane configured to close the central gap (“peel-of 'cover), and flanging and bending operations in the ring to cutting edge removal and edge closure.
  • a layer of varnish with propylene can be applied to the metal sheet, to provide the subsequent heat-sealing of the central membrane to the central gap of the ring.
  • a varnish without propylene can be applied, only to facilitate machining, of the sheet, and later, once the ring is made, before fixing the central membrane, apply polypropylene only to said ring to heat seal the central membrane.
  • a plastic sheet before the stage of drawing the metal sheet a plastic sheet can be applied, said plastic sheet being the one that subsequently provides the heat-sealing of the central membrane.
  • the drawing step can be carried out in a single phase, or in two different phases.
  • the step is carried out in the drawing stage, before the cutting stage of the upper part of the cylindrical body.
  • the upper part of the cylindrical body would be cut out, obtaining the ring, and then a bending of the outer edge of the circumferential wing of the ring is made, originating said bent a channel.
  • the step is made before cutting the upper part of the cylinder, by making the step there is a decrease in diameter that affects the container, so that once the upper part of the cylindrical body is cut, said body Cylindrical would have to be expanded in an expander to increase its diameter to the nominal of the container. Once this expansion has been carried out, the upper flange would be made on the container, and the bottom or base of the container, if it had not been carried out in the stuffing stage.
  • the step is not made in the drawing stage, but later, once the upper part of the cylindrical body has been cut out, directly to the ring obtained.
  • This second option provides the advantage that in this case the container would not have to be expanded, as in the previous option, and more standard, less special materials can also be used.
  • the step is carried out, and then the bending of the outer edge of the circumferential flange of the ring is carried out, which originates the channel.
  • the container would not have to be expanded, so the upper flange would be made directly on said container, and the bottom or base of the container, if it had not been made in the stuffing stage.
  • the container and the complementary ring to it are fully formed, and said ring remains arranged to receive a gumming of the channel, which provides a hermetic closure of the container with its lid, thanks to the fact that the gum acts as a seal in the closure.
  • varnish with propylene is added and the central membrane is heat-sealed on the step, which closes the central hole, leaving the cover finished.
  • a deep-drawn capsule is manufactured from which the upper part is cut off in a subsequent process.
  • This upper part is shaped to produce a ring to which an aluminum foil is subsequently heat sealed.
  • the lower part is shaped to produce a deep-drawn container.
  • the container and the complementary lid are obtained. Therefore, obtains a removable central membrane cap, or "peel-off" cap with the opening already made and a surface on the outer ring available for heat sealing, not from a conventional cap with its consequent useless metal, but from from another completely different process where a ring is formed, without loss.
  • the opening is not made to a disk of material to obtain a ring, but a ring is obtained directly from another manufacturing process.
  • the main advantage of the method object of the present invention is that by not having to cut the center of the existing sheet metal cover, no waste is generated. That is, to make the same product (peel-off lid) less raw material is used, and less waste is generated, with the consequent benefits that this entails, economic and environmental benefits, etc.
  • Peel-off lids are an interesting alternative for many packaging solutions, beyond the metal container. It is very attractive for the comfort of use and safety for the consumer, but at present it was in conflict with environmental sustainability, due to the great waste of material (approximately 32%) that occurred in its manufacture. Therefore, with the new manufacturing method object of the present invention, a saving of 32% in materials has an undeniable advantage not only environmental, but also economic.
  • the novelty and inventive step of the method object of the present invention is to completely modify the manufacturing process of the two-piece container, to obtain the metal, already in the form of a ring, that is needed to form the lid with the necessary surface to be closed onto the container and to heat seal the release foil. That is, in the same process obtain the two elements to be joined, lid and container. This represents a radical change in the manufacturing concept, greatly reducing the cost.
  • Figures 1a and 1b show the output of a metal sheet from a first phase of a drawing stage according to a particular embodiment of the invention.
  • Figures 2a and 2b show the output of the cylindrical body of a second phase of the drawing stage according to a particular embodiment of the invention, according to a first option. As can be seen, in said first option the step is made in the stuffing phase.
  • Figures 3a and 3b show the outlet of the cylindrical body according to a previous particular embodiment, according to the first option, of a step of cutting excess of the circumferential wing.
  • Figures 4a to 4d show the output of the cylindrical body according to a particular previous embodiment, according to the first option, of a cutting stage of the upper part of the cylindrical body, originating the ring (figures 4a and 4b) and the container ( Figures 4c and 4d).
  • Figures 5a, 5b and 5c show the exit of the ring, according to the first option, from the step of trimming the upper part of the cylindrical body.
  • Figures 6a and 6b show the output of the cylindrical body of a second phase of the drawing stage according to a particular embodiment of the invention, according to a second option. As can be seen, in this second option the step is not made in the stuffing phase.
  • Figures 7a and 7b show the output of the cylindrical body according to a previous particular embodiment, according to the second option, of a step of cutting excess of the circumferential wing.
  • Figures 8a to 8d show the output of the cylindrical body according to a previous particular embodiment, according to the second option, of a cutting stage of the upper part of the cylindrical body, originating the ring ( Figures 8a and 8b) and the container ( Figures 8c and 8d). As can be seen, in this second option the step does not appear in the ring yet.
  • Figures 9a, 9b and 9c show the exit of the ring, according to the second option, from the step of trimming the upper part of the cylindrical body. The step does not appear in the ring yet.
  • Figures 10a, 10b and 10c show the exit of the ring, according to the second option, from the stage of making the step. In this case the step already appears in the ring.
  • Figures 11a, 11b and 11c show the exit of the ring from the step of bending the outer edge of the circumferential flange of the ring.
  • Figures 12a, 12b and 12c show the exit of the ring from the winding stage of the inner edge of the circumferential flange of the ring.
  • Figures 13a, 13b and 13c show the exit of the ring from the flanging stage of the outer edge of the circumferential flange of the ring.
  • Figures 14a, 14b and 14c show the exit of the ring from the gumming stage of the channel.
  • Figures 15a, 15b and 15c show the final appearance of the lid once the central membrane has been heat sealed in the step of the ring, which closes the central gap.
  • the object of the present invention is a method of joint manufacturing of can container 6 and its lid 15 with a central detachable membrane, conventionally known as a "peel-off" lid 15.
  • the present method has a first stage of drawing to a metal sheet 1, in which, by means of at least one press, a cylindrical body 2 is obtained as a result of the operation, which has a closed lower base 3 or bottom, and an open top 4.
  • the lid 15 and the container 6 After drawing, different operations are carried out to form both the lid 15 and the container 6, mainly a step of cutting the upper part 4 of the cylindrical body 2, and separating said upper part 4.
  • the remaining cylindrical body 2 originates the tin container 6, while the separate upper part 4 creates a ring 7 complementary to said container 6.
  • the ring 7 includes a central hole 8, and an internal edge 12 that delimits the central hole 8, as can be seen in the figures.
  • a circumferential flange 5 is formed in the open upper part 4, and the ring 7 originated in the stage of trimming the upper part 4 additionally comprises said circumferential wing 5, which in turn has an outer edge 11.
  • the Figures 1a-1b, 2a-2b and 6a-6b show the output of this drawing stage.
  • a stage of cutting excess material from the circumferential wing 5 could be carried out in a trimming station, to eliminate the irregular edges that always remain after a drawing process, and leave a perfect circumferential flange 5 outer edge 11.
  • the circumferential flange 5 is not shaped in the first drawing stage, but in the ring 7 originated in the stage of cutting the upper part 4, which also has an outer edge 11.
  • a step of trimming the excess material from said circumferential wing 5 could be carried out in a trimming station, to eliminate the irregular edges and leave a perfect outer edge 11 of the circumferential wing 5.
  • a step operation is also performed, which causes a step 9 around the central gap 8, for supporting and sealing a central membrane 10 configured to close the central gap 8, and beading and bending operations in the ring 7 for the removal of sharp edges and edge closure.
  • the metal sheet 1 can be coated with a varnish with propylene, to provide the subsequent heat sealing of the central membrane 10 to the central gap 8 of the ring 7.
  • varnish without propylene can be applied, just to facilitate machining, and later, once the ring 7 has been made, before fixing the central membrane 10, applying polypropylene only to said ring 7 to heat seal said central membrane 10.
  • a plastic sheet before the drawing stage, can be applied to the metal sheet 1, said plastic sheet being the one that subsequently provides the heat-sealing of the central membrane 10.
  • the The stuffing stage can be carried out in a single phase, or in two different phases. In the case of 6 high-rise containers, it is It is convenient to carry out the embossing in two differentiated phases to achieve that the stretching of the material is less, and obtain a smoother surface, which facilitates a subsequent lithography or image stamping operation in said container 6.
  • the step 9 is carried out in the drawing stage, before the stage of cutting the upper part 4 of the cylindrical body 2.
  • Figures 2a-2b, 3a-3b, 4a-4d, 5a-5c are refer specifically to this first option.
  • step 9 the upper part 4 of the cylindrical body 2 is cut out, obtaining the ring 7 that will originate the lid. 15, and then a bending of the outer edge 11 of the circumferential flange 5 of the ring 7 is made, said bending causing a channel 13.
  • the step 9 is made before cutting the upper part 4 of the cylindrical body 2, by making the step 9 there is a decrease in the diameter that affects the container 6, so once the upper part 4 is cut of the cylindrical body 2, 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 has been carried out, the upper flange would be made on the container 6 for the subsequent joining of the lid 15, and the bottom or base 3 of the container, if it had not been carried out in the stuffing stage.
  • step 9 is not carried out in the drawing stage, but later, once the upper part 4 of the cylindrical body 2, that is to say directly on 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, so the upper flange would be made directly in said container 6, and the bottom or base 3 of the container, if it had not been made in the stuffing stage.
  • step 9 varnish with propylene is added and the central membrane 10 is heat sealed on step 9 , which closes the central hole 8, leaving the lid 15 finished and ready to be fixed to the container 6, closing it, once the content has been introduced.

Abstract

The invention relates to a method for jointly manufacturing a tin container and its lid with a detachable central membrane by pressing a metal sheet (1) so as to obtain a cylindrical body (2) with a closed lower base (3) and an open upper part (4) with a circumferential rim (5). The upper part (4) of the cylindrical body (2) is then trimmed and separated therefrom, the remaining cylindrical body (2) generating a tin container (6), and the separated upper part (4) generating a ring (7), with the circumferential rim having an external edge (11), a central space (8), and an internal edge (12) demarcating said central space (8). A step (9) for supporting and sealing a central membrane (10) is made in the ring (7) around the central space (8), and flanging and bending operations for removing sharp ridges and closing edges (11,12) are performed.

Description

DESCRIPCIÓN DESCRIPTION
Título Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible Title Method of joint manufacturing of tin container and its lid with removable central membrane
Campo de la invención La presente invención pertenece al campo técnico de los envases metálicos, concretamente a los envases de lata y sus tapas, y más concretamente a las tapas denominadas de fácil apertura, las cuales se abren sin necesidad de herramientas. De forma específica, la invención se refiere a la fabricación conjunta de envases de lata y sus tapas realizadas con membrana central desprendible, conocidas como tapas “peel-off”. Field of the Invention The present invention belongs to the technical field of metal containers, specifically tin containers and their lids, and more specifically so-called easy-open lids, which are opened without the need for tools. Specifically, the invention relates to the joint manufacture of tin cans and their lids made with a removable central membrane, known as "peel-off" lids.
Antecedentes de la invención Background of the invention
En la actualidad existen diferentes tipos de envases con sus correspondientes tapas. En el caso de los envases utilizados para productos alimenticios denominados de fácil apertura, la tapa de éstos suele ser de hojalata, aunque se pueden realizar en diferentes materiales tales como el aluminio, y adoptar diferentes formas como circular, rectangular, oval, etc. En los últimos años han cobrado gran importancia los envases con tapas de fácil apertura con membrana central desprendible, también conocidas como tapas “peel- off”. Este tipo de tapas está formado por un anillo externo unido permanentemente al envase, y una membrana o lámina central termosellada a este anillo y que obtura el hueco central, desprendible de forma sencilla mediante una tira o anilla. Esta membrana o lámina central suele estar realizada en aluminio, aunque también puede estar realizada en plástico y/u otro metal. Currently there are different types of containers with their corresponding lids. In the case of containers used for so-called easy-open food products, the lid of these is usually made of tin, although they can be made of different materials such as aluminum, and adopt different shapes such as circular, rectangular, oval, etc. In recent years, containers with easy-open lids with a removable central membrane, also known as "peel-off" lids, have gained great importance. This type of lids is made up of an external ring permanently attached to the container, and a central membrane or sheet heat-sealed to this ring and that closes the central hole, easily removable by means of a strip or ring. This membrane or central sheet is usually made of aluminum, although it can also be made of plastic and / or other metal.
Para la fabricación de estas tapas “peel-off” o desprendióles, en la actualidad se parte de la fabricación de una tapa convencional sobre la que se realiza una abertura central en su parte plana, formando un anillo al que posteriormente se le termosella una lámina de aluminio u otro material. Esto supone que toda la superficie central de la tapa es recortada y eliminada. Esta pieza de metal recortado con sus barnices de protección aplicados, se considera un subproducto y una merma del proceso, lo que supone un desperdicio muy elevado de material además de un gran perjuicio para el medio ambiente. For the manufacture of these "peel-off" or detachable lids, currently part of the manufacture of a conventional lid on which a central opening is made in its flat part, forming a ring to which a later is heat sealed. aluminum foil or other material. This assumes that the entire center surface of the lid is trimmed and removed. This piece of cut metal with its protective varnishes applied, is considered a by-product and a waste of the process, which means a very high waste of material as well as a great damage to the environment.
Es por tanto deseable un método para fabricar una tapa con membrana o lámina central desprendible, o “peel-off” de forma eficiente, que ahorre material y respetuosa con el medio ambiente, evitando los inconvenientes existentes en los anteriores sistemas del estado de la técnica, y además obtener al mismo tiempo el envase complementario a dicha tapa. It is therefore desirable a method to manufacture a lid with a membrane or central removable sheet, or "peel-off" in an efficient way, which saves material and is respectful with the environment, avoiding the inconveniences existing in the previous systems of the state of the art. , and also obtain at the same time the container complementary to said lid.
Descripción de la invención Description of the invention
La presente invención resuelve los problemas existentes en el estado de la técnica mediante un método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, conocida convencionalmente como tapa “peel-off”. The present invention solves the problems existing in the state of the art by means of a joint manufacturing method of the tin container and its lid with a central detachable membrane, conventionally known as a "peel-off" lid.
El método presenta una primera etapa de embutición a una chapa metálica, en la cual, por medio de al menos una prensa se obtiene como resultado de la operación un cuerpo cilindrico que tiene una base inferior cerrada y una parte superior abierta. La chapa metálica tiene que tener las dimensiones suficientes para cumplir con el diámetro y altura requeridos para el envase. The method presents a first stage of drawing into a metal sheet, in which, by means of at least one press, a cylindrical body having a closed lower base and an open upper part is obtained as a result of the operation. The metal sheet must have sufficient dimensions to meet the diameter and height required for the container.
Después de la embutición se realizan diferentes operaciones para conformar tanto la tapa como el envase, principalmente una etapa de recorte de la parte superior del cuerpo cilindrico, y separación de dicha parte superior. El cuerpo cilindrico restante origina un envase de lata, mientras que la parte superior separada origina un anillo complementario a dicho envase. El anillo incluye un hueco central y un borde interno que delimita el hueco central. After drawing, different operations are carried out to shape both the lid and the container, mainly a step of cutting the upper part of the cylindrical body, and separating said upper part. The remaining cylindrical body creates a can container, while the separate upper part creates a ring complementary to said container. The ring includes a central hollow and an internal edge that delimits the central hollow.
De acuerdo con una realización opcional de la invención, en la etapa de embutición de la chapa metálica se conforma en la parte superior abierta un ala circunferencial, y el anillo originado en la etapa de recorte de la parte superior comprende adicionalmente dicha ala circunferencial, que tiene a su vez un borde externo. En este caso, después de la primera etapa de embutición, opcionalmente se podría realizar una etapa de recorte de material sobrante del ala circunferencial en una estación recortadora, para eliminar los bordes irregulares que quedan siempre tras un proceso de embutición, y dejar un borde externo de ala circunferencial perfecto. According to an optional embodiment of the invention, in the stage of drawing the metal sheet a circumferential flange is formed in the open upper part, and the ring originated in the step of trimming the upper part additionally comprises said circumferential flange, which it also has an outer edge. In this case, after of the first stage of drawing, optionally a step of trimming the excess material of the circumferential wing could be carried out in a trimming station, to eliminate the irregular edges that always remain after a drawing process, and leave a perfect outer edge of the circumferential wing.
De acuerdo con una realización alternativa a la anterior, el ala circunferencial no se conforma en la primera etapa de embutición, sino en el anillo originado en la etapa de recorte de la parte superior, la cual presenta igualmente un borde externo. En este caso, después de este conformado del ala circunferencial, opcionalmente se podría realizar una etapa de recorte de material sobrante de dicho ala circunferencial en una estación recortadora, para eliminar los bordes irregulares y dejar un borde externo de ala circunferencial perfecto. According to an alternative embodiment to the previous one, the circumferential wing is not formed in the first drawing stage, but in the ring originated in the upper part cutting stage, which also has an external edge. In this case, after this shaping of the circumferential flange, optionally a step of trimming the excess material from said circumferential flange could be carried out in a trimming station, to eliminate the irregular edges and leave a perfect circumferential flange outer edge.
También se realiza una operación de escalonado, obteniéndose un escalón alrededor del hueco central, para el apoyo y sellado de una membrana central configurada para cerrar el hueco central (tapa “peel-of’), y operaciones de rebordeo y doblado en el anillo para la eliminación de aristas cortantes y cierre de bordes. A step operation is also carried out, obtaining a step around the central gap, for the support and sealing of a central membrane configured to close the central gap (“peel-of 'cover), and flanging and bending operations in the ring to cutting edge removal and edge closure.
Antes de la etapa de embutición, a la chapa metálica se le puede aplicar una capa de barniz con propileno, para proporcionar el posterior termosellado de la membrana central al hueco central del anillo. Before the drawing stage, a layer of varnish with propylene can be applied to the metal sheet, to provide the subsequent heat-sealing of the central membrane to the central gap of the ring.
Alternativamente, en lugar de aplicar barniz con propileno a toda la chapa antes de la embutición, para abaratar costes se puede aplicar barniz sin propileno, únicamente para facilitar el mecanizado, de la chapa, y posteriormente, una vez realizado el anillo, antes de fijar la membrana central, aplicar polipropileno únicamente a dicho anillo para realizar el termosellado de la membrana central. Alternatively, instead of applying varnish with propylene to the entire sheet before drawing, to reduce costs, a varnish without propylene can be applied, only to facilitate machining, of the sheet, and later, once the ring is made, before fixing the central membrane, apply polypropylene only to said ring to heat seal the central membrane.
Según una realización alternativa al barniz, antes de la etapa de embutición a la chapa metálica se le puede aplicar una lámina de plástico, siendo dicha lámina de plástico la que proporciona posteriormente el termosellado de la membrana central. According to an alternative embodiment to varnish, before the stage of drawing the metal sheet a plastic sheet can be applied, said plastic sheet being the one that subsequently provides the heat-sealing of the central membrane.
De acuerdo con diferentes realizaciones, la etapa de embutición se puede realizar en una única fase, o bien en dos fases diferentes. Para el caso de envases de elevada altura, es conveniente realizar la embutición en dos fases diferenciadas para conseguir que el estiramiento del material sea menor, y obtener una superficie más suave, lo que facilita una posterior operación de litografía o estampado de imágenes en dicho envase. According to different embodiments, the drawing step can be carried out in a single phase, or in two different phases. In the case of containers of high height, it is convenient to carry out the stuffing in two differentiated phases to achieve that the stretching of the material is less, and obtain a smoother surface, which facilitates a subsequent lithography or image stamping operation in said container.
De forma particular, en esta etapa de embutición se le puede proporcionar ya una forma y rebajado determinado a la base inferior cerrada del cuerpo cilindrico, lo que constituirá la base del envase. In particular, in this drawing stage, a certain shape and recess can already be provided to the closed lower base of the cylindrical body, which will constitute the base of the container.
Existen dos opciones para realizar el escalón para el apoyo y sellado de la membrana central, y según cual de las opciones se lleve a cabo continuará el método de una forma u otra. There are two options for making the step for the support and sealing of the central membrane, and depending on which of the options is carried out, the method will continue in one way or another.
Según la primera opción, el escalón se realiza en la etapa de embutición, antes de la etapa de recorte de la parte superior del cuerpo cilindrico. Esto proporciona la ventaja de necesitar menos material, aproximadamente un 9% menos de material, y además la tapa se realiza con una operación menos. According to the first option, the step is carried out in the drawing stage, before the cutting stage of the upper part of the cylindrical body. This provides the advantage of requiring less material, approximately 9% less material, and also the lid is made in one less operation.
De acuerdo con esta primera opción, tras la etapa de embutición en la que se realiza el escalón se realizaría el recorte de la parte superior del cuerpo cilindrico obteniéndose el anillo, y a continuación se realiza un doblado del borde externo del ala circunferencial del anillo, originando dicho doblado un canal. According to this first option, after the embossing stage in which the step is made, the upper part of the cylindrical body would be cut out, obtaining the ring, and then a bending of the outer edge of the circumferential wing of the ring is made, originating said bent a channel.
Dado que en esta primera opción el escalón se realiza antes de recortar la parte superior del cilindro, mediante la realización del escalón se produce una disminución del diámetro que afecta al envase, por lo que una vez recortada la parte superior del cuerpo cilindrico, dicho cuerpo cilindrico tendría que expansionarse en una expansionadora para aumentar su diámetro hasta el nominal del envase. Una vez realizada esta expansión, se realizaría la pestaña superior en el envase, y el fondo o base del envase, si no se había realizado en la etapa de embutición. Given that in this first option the step is made before cutting the upper part of the cylinder, by making the step there is a decrease in diameter that affects the container, so that once the upper part of the cylindrical body is cut, said body Cylindrical would have to be expanded in an expander to increase its diameter to the nominal of the container. Once this expansion has been carried out, the upper flange would be made on the container, and the bottom or base of the container, if it had not been carried out in the stuffing stage.
Alternativamente, según la segunda opción, el escalón no se realiza en la etapa de embutición, sino posteriormente, una vez realizado el recorte de la parte superior del cuerpo cilindrico, directamente al anillo obtenido. Esta segunda opción proporciona la ventaja de que en este caso no habría que expansionar el envase, como en la opción anterior, y además se pueden utilizar materiales más estándar, menos especiales. De acuerdo con esta segunda opción, tras el recorte de la parte superior del cuerpo cilindrico se realiza el escalonado, y a continuación se realiza el doblado del borde externo del ala circunferencial del anillo, el cual origina el canal. Alternatively, according to the second option, the step is not made in the drawing stage, but later, once the upper part of the cylindrical body has been cut out, directly to the ring obtained. This second option provides the advantage that in this case the container would not have to be expanded, as in the previous option, and more standard, less special materials can also be used. According to this second option, after cutting the upper part of the cylindrical body, the step is carried out, and then the bending of the outer edge of the circumferential flange of the ring is carried out, which originates the channel.
En este caso no se tendría que expansionar el envase, por lo que se realizaría directamente la pestaña superior en dicho envase, y el fondo o base del envase, si no se había realizado en la etapa de embutición. In this case, the container would not have to be expanded, so the upper flange would be made directly on said container, and the bottom or base of the container, if it had not been made in the stuffing stage.
Para ambas opciones, una vez realizado el doblado del borde externo del ala circunferencial del anillo, se realiza un enrollado del borde interno del anillo, el cual se puede realizar en una sola operación, o bien en dos operaciones independientes y consecutivas. Esta realización en dos operaciones independientes y consecutivas proporciona la ventaja de que el conformado es más sencillo y se evita la formación de arrugas y pliegues, que ocasionarían que el borde no estuviera protegido totalmente. For both options, once the outer edge of the circumferential flange of the ring has been bent, a winding of the inner edge of the ring is carried out, which can be carried out in a single operation, or in two independent and consecutive operations. This implementation in two independent and consecutive operations provides the advantage that the shaping is simpler and the formation of wrinkles and folds is avoided, which would cause the edge not to be fully protected.
Igualmente, para ambas opciones indicadas anteriormente, tras el doblado del borde externo del ala circunferencial del anillo, se realiza un rebordeo de dicho borde externo Likewise, for both options indicated above, after bending the outer edge of the circumferential flange of the ring, a flange is made of said outer edge
Finalmente, una vez se han realizado todas las operaciones de separado de la tapa del cuerpo principal del envase, escalonado, y las operaciones de rebordeo y doblado en el anillo, queda conformados totalmente el envase y el anillo complementario a éste, y dicho anillo queda dispuesto para recibir un engomado del canal, lo que proporciona un cierre hermético del envase con su tapa, gracias a que el engomado hace de junta de estanqueidad en el cierre. Finally, once all the operations of separating the lid from the main body of the container, staggered, and the operations of beading and bending in the ring have been carried out, the container and the complementary ring to it are fully formed, and said ring remains arranged to receive a gumming of the channel, which provides a hermetic closure of the container with its lid, thanks to the fact that the gum acts as a seal in the closure.
De acuerdo con una realización particular de la invención, y en el caso concreto que el barniz inicial no llevara incorporado propileno, una vez finalizado el anillo, se añade barniz con propileno y se realiza el termosellado de la membrana central sobre el escalón, la cual cierra el hueco central, quedando la tapa finalizada. According to a particular embodiment of the invention, and in the specific case that the initial varnish does not incorporate propylene, once the ring is finished, varnish with propylene is added and the central membrane is heat-sealed on the step, which closes the central hole, leaving the cover finished.
Es decir, mediante el nuevo método se fabrica una capsula embutida a la que en un proceso posterior se recorta la parte superior. Esta parte superior se conforma para producir un anillo al que posteriormente se termosella una lámina de aluminio. A su vez la parte inferior se conforma para producir un envase embutido. Con el mismo cuerpo cilindrico se obtiene el envase y la tapa complementaria a éste. Por tanto, se obtiene una tapa de membrana central desprendible, o tapa “peel-off” con la abertura ya realizada y una superficie en el anillo exterior disponible para el termo-sellado, no a partir de una tapa convencional con su consecuente metal inservible, sino a partir de otro proceso completamente diferente donde se forma un anillo, sin merma. No se realiza la abertura a un disco de material para obtener un anillo, sino que se obtiene directamente un anillo de otro proceso de fabricación. In other words, by means of the new method, a deep-drawn capsule is manufactured from which the upper part is cut off in a subsequent process. This upper part is shaped to produce a ring to which an aluminum foil is subsequently heat sealed. In turn, the lower part is shaped to produce a deep-drawn container. With the same cylindrical body, the container and the complementary lid are obtained. Therefore, obtains a removable central membrane cap, or "peel-off" cap with the opening already made and a surface on the outer ring available for heat sealing, not from a conventional cap with its consequent useless metal, but from from another completely different process where a ring is formed, without loss. The opening is not made to a disk of material to obtain a ring, but a ring is obtained directly from another manufacturing process.
La principal ventaja del método objeto de la presente invención es que al no tener que recortar el centro de la tapa de chapa metálica ya existente, no se genera desperdicio. Es decir, para realizar el mismo producto (tapa peel-off) se utiliza menos materia prima, y se genera menos desperdicio, con los consiguientes beneficios que esto conlleva, beneficios económicos, medioambientales, etc. The main advantage of the method object of the present invention is that by not having to cut the center of the existing sheet metal cover, no waste is generated. That is, to make the same product (peel-off lid) less raw material is used, and less waste is generated, with the consequent benefits that this entails, economic and environmental benefits, etc.
Las tapas “peel-off” son una alternativa interesante para muchas soluciones de embalaje, más allá del envase metálico. Es muy atractivo por la comodidad de uso y seguridad para el consumidor, pero en la actualidad entraba en conflicto con la sostenibilidad medioambiental, debido al gran desperdicio de material (aproximadamente un 32%) que se producía en su fabricación. Por tanto, con el nuevo método de fabricación objeto de la presente invención, un ahorro de un 32% en materiales tiene una ventaja indiscutible no sólo medioambiental, sino también económica. Peel-off lids are an interesting alternative for many packaging solutions, beyond the metal container. It is very attractive for the comfort of use and safety for the consumer, but at present it was in conflict with environmental sustainability, due to the great waste of material (approximately 32%) that occurred in its manufacture. Therefore, with the new manufacturing method object of the present invention, a saving of 32% in materials has an undeniable advantage not only environmental, but also economic.
Hasta ahora se ha visto la fabricación del envase y de la tapa como dos procesos distintos, independientes y no relacionados. La novedad y actividad inventiva del método objeto de la presente invención es modificar completamente el proceso de fabricación del envase de dos piezas, para obtener el metal, ya en forma de anillo, que se necesita para formar la tapa con la superficie necesaria para ser cerrado sobre el envase y para termo-sellar la lámina desprendible. Es decir, en el mismo proceso obtener los dos elementos a unir, tapa y envase. Esto supone un cambio radical en el concepto de fabricación, abaratando mucho el coste. A los envasadores y usuarios de esta tapa les permite seguir utilizando los mismos equipos de cerrado de envases en sus fábricas sin limitaciones de velocidad frente a otras soluciones que, aunque sí prescinden del coste de la tapa al permitir termo-sellar en el envase directamente, están muy penalizadas por la velocidad de la operación y perdida de eficacia. Breve descripción de los dibujos Until now, the manufacture of the container and the lid has been seen as two different, independent and unrelated processes. The novelty and inventive step of the method object of the present invention is to completely modify the manufacturing process of the two-piece container, to obtain the metal, already in the form of a ring, that is needed to form the lid with the necessary surface to be closed onto the container and to heat seal the release foil. That is, in the same process obtain the two elements to be joined, lid and container. This represents a radical change in the manufacturing concept, greatly reducing the cost. It allows packers and users of this lid to continue using the same container closing equipment in their factories without speed limitations compared to other solutions that, although they do dispense with the cost of the lid by allowing direct thermo-sealing of the container, they are heavily penalized by the speed of the operation and loss of efficiency. Brief description of the drawings
A continuación, para facilitar la comprensión de la invención, a modo ilustrativo pero no limitativo se describirá una realización de la invención que hace referencia a una serie de figuras. In order to facilitate the understanding of the invention, an embodiment of the invention will be described below, by way of illustration but not limitation, making reference to a series of figures.
Las figuras 1a y 1b muestran la salida de una chapa metálica de una primera fase de una etapa de embutición de acuerdo con una realización particular de la invención. Las figuras 2a y 2b muestran la salida del cuerpo cilindrico de una segunda fase de la etapa de embutición de acuerdo con una realización particular de la invención, según una primera opción. Tal y como se puede observar, en dicha primera opción el escalón se realiza en la fase de embutición. Las figuras 3a y 3b muestran la salida del cuerpo cilindrico según una realización particular anterior, de acuerdo con la primera opción, de una etapa de recorte de sobrante del ala circunferencial. Figures 1a and 1b show the output of a metal sheet from a first phase of a drawing stage according to a particular embodiment of the invention. Figures 2a and 2b show the output of the cylindrical body of a second phase of the drawing stage according to a particular embodiment of the invention, according to a first option. As can be seen, in said first option the step is made in the stuffing phase. Figures 3a and 3b show the outlet of the cylindrical body according to a previous particular embodiment, according to the first option, of a step of cutting excess of the circumferential wing.
Las figuras 4a a 4d muestran la salida del cuerpo cilindrico según una realización particular anterior, de acuerdo con la primera opción, de una etapa de recorte de la parte superior del cuerpo cilindrico, originando el anillo (figuras 4a y 4b) y el envase (figuras 4c y 4d). Figures 4a to 4d show the output of the cylindrical body according to a particular previous embodiment, according to the first option, of a cutting stage of the upper part of the cylindrical body, originating the ring (figures 4a and 4b) and the container ( Figures 4c and 4d).
Las figuras 5a, 5b y 5c muestran la salida del anillo, de acuerdo con la primera opción, de la etapa de recorte de la parte superior del cuerpo cilindrico. Figures 5a, 5b and 5c show the exit of the ring, according to the first option, from the step of trimming the upper part of the cylindrical body.
Las figuras 6a y 6b muestran la salida del cuerpo cilindrico de una segunda fase de la etapa de embutición de acuerdo con una realización particular de la invención, según una segunda opción. Tal y como se puede observar, en esta segunda opción el escalón no se realiza en la fase de embutición. Figures 6a and 6b show the output of the cylindrical body of a second phase of the drawing stage according to a particular embodiment of the invention, according to a second option. As can be seen, in this second option the step is not made in the stuffing phase.
Las figuras 7a y 7b muestran la salida del cuerpo cilindrico según una realización particular anterior, de acuerdo con la segunda opción, de una etapa de recorte de sobrante del ala circunferencial. Las figuras 8a a 8d muestran la salida del cuerpo cilindrico según una realización particular anterior, de acuerdo con la segunda opción, de una etapa de recorte de la parte superior del cuerpo cilindrico, originando el anillo (figuras 8a y 8b) y el envase (figuras 8c y 8d). Tal y como se puede observar, en esta segunda opción el escalón no aparece aún en el anillo. Figures 7a and 7b show the output of the cylindrical body according to a previous particular embodiment, according to the second option, of a step of cutting excess of the circumferential wing. Figures 8a to 8d show the output of the cylindrical body according to a previous particular embodiment, according to the second option, of a cutting stage of the upper part of the cylindrical body, originating the ring (Figures 8a and 8b) and the container ( Figures 8c and 8d). As can be seen, in this second option the step does not appear in the ring yet.
Las figuras 9a, 9b y 9c muestran la salida del anillo, de acuerdo con la segunda opción, de la etapa de recorte de la parte superior del cuerpo cilindrico. El escalón no aparece aún en el anillo. Figures 9a, 9b and 9c show the exit of the ring, according to the second option, from the step of trimming the upper part of the cylindrical body. The step does not appear in the ring yet.
Las figuras 10a, 10b y 10c muestran la salida del anillo, de acuerdo con la segunda opción, de la etapa de realización del escalón. En este caso el escalón ya aparece en el anillo. Figures 10a, 10b and 10c show the exit of the ring, according to the second option, from the stage of making the step. In this case the step already appears in the ring.
Las figuras 11a, 11b y 11c muestran la salida del anillo de la etapa de doblado del borde externo del ala circunferencial del anillo. Figures 11a, 11b and 11c show the exit of the ring from the step of bending the outer edge of the circumferential flange of the ring.
Las figuras 12a, 12b y 12c muestran la salida del anillo de la etapa de enrollado del borde interno del ala circunferencial del anillo. Figures 12a, 12b and 12c show the exit of the ring from the winding stage of the inner edge of the circumferential flange of the ring.
Las figuras 13a, 13b y 13c muestran la salida del anillo de la etapa de rebordeo del borde externo del ala circunferencial del anillo. Figures 13a, 13b and 13c show the exit of the ring from the flanging stage of the outer edge of the circumferential flange of the ring.
Las figuras 14a, 14b y 14c muestran la salida del anillo de la etapa de engomado del canal. Figures 14a, 14b and 14c show the exit of the ring from the gumming stage of the channel.
Las figuras 15a, 15b y 15c muestran el aspecto final de la tapa una vez se ha realizado el termosellado de la membrana central en el escalón del anillo, la cual obtura el hueco central. Figures 15a, 15b and 15c show the final appearance of the lid once the central membrane has been heat sealed in the step of the ring, which closes the central gap.
En estas figuras se hace referencia a un conjunto de elementos que son: In these figures, reference is made to a set of elements that are:
1. chapa metálica 1. sheet metal
2. cuerpo cilindrico tras embutición a chapa metálica 2. cylindrical body after drawing into metal sheet
3. base inferior del cuerpo cilindrico 3. lower base of cylindrical body
4. parte superior del cuerpo cilindrico 5. ala circunferencial de la parte superior del cuerpo cilindrico 4. upper part of the cylindrical body 5. circumferential flange of the upper part of the cylindrical body
6. envase de lata 6. tin container
7. anillo 7. ring
8. hueco central 9. escalón de la tapa 8. central hole 9. lid step
10. membrana central 10. central membrane
11. borde externo del ala circunferencial el anillo 11. outer edge of the flange circumferential the ring
12. borde interno del anillo 12. inner edge of the ring
13. canal 14. pestaña superior del envase 13. channel 14. upper flange of the container
15. tapa 15. lid
Descripción detallada de la invención El objeto de la presente invención es un método de fabricación conjunta de envase 6 de lata y su tapa 15 con membrana central desprendible, conocida convencionalmente como tapa 15 “peel-off”. Detailed Description of the Invention The object of the present invention is a method of joint manufacturing of can container 6 and its lid 15 with a central detachable membrane, conventionally known as a "peel-off" lid 15.
El presente método tiene una primera etapa de embutición a una chapa metálica 1, en la cual, por medio de al menos una prensa, se obtiene como resultado de la operación un cuerpo cilindrico 2, el cual presenta una base inferior 3 cerrada o fondo, y una parte superior abierta 4. The present method has a first stage of drawing to a metal sheet 1, in which, by means of at least one press, a cylindrical body 2 is obtained as a result of the operation, which has a closed lower base 3 or bottom, and an open top 4.
Después de la embutición se realizan diferentes operaciones para conformar tanto la tapa 15 como el envase 6, principalmente una etapa de recorte de la parte superior 4 del cuerpo cilindrico 2, y separación de dicha parte superior 4. Así, el cuerpo cilindrico 2 restante origina el envase 6 de lata, mientras que la parte superior 4 separada origina un anillo 7 complementario a dicho envase 6. El anillo 7 incluye un hueco central 8, y un borde interno 12 que delimita el hueco central 8, tal y como se puede observar en las figuras. After drawing, different operations are carried out to form both the lid 15 and the container 6, mainly a step of cutting the upper part 4 of the cylindrical body 2, and separating said upper part 4. Thus, the remaining cylindrical body 2 originates the tin container 6, while the separate upper part 4 creates a ring 7 complementary to said container 6. The ring 7 includes a central hole 8, and an internal edge 12 that delimits the central hole 8, as can be seen in the figures.
De acuerdo con una realización opcional de la invención, en la etapa de embutición de la chapa metálica 1 se conforma en la parte superior 4 abierta un ala circunferencial 5, y el anillo 7 originado en la etapa de recorte de la parte superior 4 comprende adicionalmente dicha ala circunferencial 5, que tiene a su vez un borde externo 11. Las figuras 1a-1b, 2a-2b y 6a-6b muestran la salida de esta etapa de embutición. En este caso, después de la primera etapa de embutición, opcionalmente se podría realizar, tal y como se puede observar en las figuras 3a-3b y 7a-7b, una etapa de recorte de material sobrante del ala circunferencial 5 en una estación recortadora, para eliminar los bordes irregulares que quedan siempre tras un proceso de embutición, y dejar un borde externo 11 de ala circunferencial 5 perfecto. According to an optional embodiment of the invention, in the stage of drawing the metal sheet 1 a circumferential flange 5 is formed in the open upper part 4, and the ring 7 originated in the stage of trimming the upper part 4 additionally comprises said circumferential wing 5, which in turn has an outer edge 11. The Figures 1a-1b, 2a-2b and 6a-6b show the output of this drawing stage. In this case, after the first embossing stage, optionally, as can be seen in Figures 3a-3b and 7a-7b, a stage of cutting excess material from the circumferential wing 5 could be carried out in a trimming station, to eliminate the irregular edges that always remain after a drawing process, and leave a perfect circumferential flange 5 outer edge 11.
De acuerdo con una realización alternativa a la anterior, el ala circunferencial 5 no se conforma en la primera etapa de embutición, sino en el anillo 7 originado en la etapa de recorte de la parte superior 4, la cual presenta igualmente un borde externo 11. En este caso, después de este conformado del ala circunferencial 5, opcionalmente se podría realizar una etapa de recorte de material sobrante de dicha ala circunferencial 5 en una estación recortadora, para eliminar los bordes irregulares y dejar un borde externo 11 de ala circunferencial 5 perfecto. According to an alternative embodiment to the previous one, the circumferential flange 5 is not shaped in the first drawing stage, but in the ring 7 originated in the stage of cutting the upper part 4, which also has an outer edge 11. In this case, after this shaping of the circumferential wing 5, optionally a step of trimming the excess material from said circumferential wing 5 could be carried out in a trimming station, to eliminate the irregular edges and leave a perfect outer edge 11 of the circumferential wing 5. .
También se realiza una operación de escalonado, lo que origina un escalón 9 alrededor del hueco central 8, para el apoyo y sellado de una membrana central 10 configurada para cerrar el hueco central 8, y operaciones de rebordeo y doblado en el anillo 7 para la eliminación de aristas cortantes y cierre de bordes. A step operation is also performed, which causes a step 9 around the central gap 8, for supporting and sealing a central membrane 10 configured to close the central gap 8, and beading and bending operations in the ring 7 for the removal of sharp edges and edge closure.
Antes de la etapa de embutición, a la chapa metálica 1 se le puede aplicar una capa de barniz con propileno, para proporcionar el posterior termosellado de la membrana central 10 al hueco central 8 del anillo 7. Before the drawing stage, the metal sheet 1 can be coated with a varnish with propylene, to provide the subsequent heat sealing of the central membrane 10 to the central gap 8 of the ring 7.
Alternativamente, en lugar de aplicar barniz con propileno a toda la chapa metálica 1 antes de la embutición, para abaratar costes se puede aplicar barniz sin propileno, únicamente para facilitar el mecanizado, y posteriormente, una vez realizado el anillo 7, antes de fijar la membrana central 10, aplicar polipropileno únicamente a dicho anillo 7 para realizar el termosellado de dicha membrana central 10. Alternatively, instead of applying varnish with propylene to the entire metal sheet 1 before drawing, to reduce costs, varnish without propylene can be applied, just to facilitate machining, and later, once the ring 7 has been made, before fixing the central membrane 10, applying polypropylene only to said ring 7 to heat seal said central membrane 10.
Según una realización alternativa al barniz, antes de la etapa de embutición, a la chapa metálica 1 se le puede aplicar una lámina de plástico, siendo dicha lámina de plástico la que proporciona posteriormente el termosellado de la membrana central 10. Según distintas realizaciones, la etapa de embutición se puede realizar en una única fase, o bien en dos fases diferentes. Para el caso de envases 6 de elevada altura, es conveniente realizar la embutición en dos fases diferenciadas para conseguir que el estiramiento del material sea menor, y obtener una superficie más suave, lo que facilita una posterior operación de litografía o estampado de imágenes en dicho envase 6. According to an alternative embodiment to varnish, before the drawing stage, a plastic sheet can be applied to the metal sheet 1, said plastic sheet being the one that subsequently provides the heat-sealing of the central membrane 10. According to different embodiments, the The stuffing stage can be carried out in a single phase, or in two different phases. In the case of 6 high-rise containers, it is It is convenient to carry out the embossing in two differentiated phases to achieve that the stretching of the material is less, and obtain a smoother surface, which facilitates a subsequent lithography or image stamping operation in said container 6.
De forma particular, en esta etapa de embutición se le puede proporcionar ya una forma y rebajado determinado a la base inferior 3 cerrada del cuerpo cilindrico 2, lo que constituirá la base del envase 6. In particular, at this stage of drawing, a certain shape and recess can already be provided to the closed lower base 3 of the cylindrical body 2, which will constitute the base of the container 6.
Existen dos opciones para realizar el escalón 9 para el apoyo y sellado de la membrana central 10, y según cual de las opciones se lleve a cabo continuará el método de una forma u otra. Estas serán la primera opción y la segunda opción, que se explicarán a continuación, con base en las figuras. There are two options for making the step 9 for the support and sealing of the central membrane 10, and depending on which of the options is carried out, the method will continue in one way or another. These will be the first option and the second option, which will be explained below, based on the figures.
Según la primera opción, el escalón 9 se realiza en la etapa de embutición, antes de la etapa de recorte de la parte superior 4 del cuerpo cilindrico 2. Las figuras 2a-2b, 3a- 3b, 4a-4d, 5a-5c se refieren concretamente a esta primera opción. According to the first option, the step 9 is carried out in the drawing stage, before the stage of cutting the upper part 4 of the cylindrical body 2. Figures 2a-2b, 3a-3b, 4a-4d, 5a-5c are refer specifically to this first option.
De acuerdo con esta primera opción, y como se observa en las figuras indicadas, tras la etapa de embutición en la que se realiza el escalón 9 se realiza el recorte de la parte superior 4 del cuerpo cilindrico 2 obteniéndose el anillo 7 que originará la tapa 15, y a continuación se realiza un doblado del borde externo 11 del ala circunferencial 5 del anillo 7, originando dicho doblado un canal 13. According to this first option, and as can be seen in the figures indicated, after the drawing stage in which step 9 is made, the upper part 4 of the cylindrical body 2 is cut out, obtaining the ring 7 that will originate the lid. 15, and then a bending of the outer edge 11 of the circumferential flange 5 of the ring 7 is made, said bending causing a channel 13.
Como en esta primera opción el escalón 9 se realiza antes de recortar la parte superior 4 del cuerpo cilindrico 2, mediante la realización del escalón 9 se produce una disminución del diámetro que afecta al envase 6, por lo que una vez recortada la parte superior 4 del cuerpo cilindrico 2, dicho cuerpo cilindrico 2 tendría que expansionarse en una expansionadora para aumentar su diámetro hasta el nominal del envase. Una vez realizada esta expansión, se realizaría la pestaña superior en el envase 6 para la posterior unión de la tapa 15, y el fondo o base 3 del envase, si no se había realizado en la etapa de embutición. As in this first option the step 9 is made before cutting the upper part 4 of the cylindrical body 2, by making the step 9 there is a decrease in the diameter that affects the container 6, so once the upper part 4 is cut of the cylindrical body 2, 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 has been carried out, the upper flange would be made on the container 6 for the subsequent joining of the lid 15, and the bottom or base 3 of the container, if it had not been carried out in the stuffing stage.
Alternativamente, según la segunda opción, el escalón 9 no se realiza en la etapa de embutición, sino posteriormente, una vez realizado el recorte de la parte superior 4 del cuerpo cilindrico 2, es decir directamente en el anillo 7 obtenido. Las figuras 6a-6b, 7a- 7b, 8a-8d, 9a-9c, 10a-10c se refieren a esta segunda opción. Alternatively, according to the second option, step 9 is not carried out in the drawing stage, but later, once the upper part 4 of the cylindrical body 2, that is to say directly on the ring 7 obtained. Figures 6a-6b, 7a-7b, 8a-8d, 9a-9c, 10a-10c refer to this second option.
De acuerdo con esta segunda opción, como se observa en estas figuras, tras el recorte de la parte superior 4 del cuerpo cilindrico 2 se lleva a cabo el escalonado, obteniéndose el escalón 9, y a continuación se realiza el doblado del borde externo 11 del ala circunferencial 5 del anillo 7, el cual origina el canal 13. According to this second option, as can be seen in these figures, after cutting the upper part 4 of the cylindrical body 2, the step is carried out, obtaining the step 9, and then the bending of the outer edge 11 of the wing is carried out. circumferential 5 of ring 7, which originates channel 13.
En este caso no se tendría que expansionar el envase 6, por lo que se realizaría directamente la pestaña superior en dicho envase 6, y el fondo o base 3 del envase, si no se había realizado en la etapa de embutición. In this case, the container 6 would not have to be expanded, so the upper flange would be made directly in said container 6, and the bottom or base 3 of the container, if it had not been made in the stuffing stage.
Las siguientes figuras 11 a-11 c, 12a-12c, 13a-13c, 14a-14c, 15a-15c aplican ya para ambas opciones (primera opción y segunda opción), dado que a partir de este momento el método continúa igual para ambas. Una vez realizado el doblado del borde externo 11 del ala circunferencial 5 del anillo 7, se realiza un enrollado del borde interno 12 del anillo 7, el cual se puede realizar en una sola operación, o bien en dos operaciones independientes y consecutivas. The following figures 11 a-11 c, 12a-12c, 13a-13c, 14a-14c, 15a-15c already apply to both options (first option and second option), since from this moment the method continues the same for both . Once the bending of the outer edge 11 of the circumferential flange 5 of the ring 7 has been carried out, a winding of the inner edge 12 of the ring 7 is carried out, which can be carried out in a single operation, or in two independent and consecutive operations.
Tras el doblado del borde externo 11 del ala circunferencial 5 del anillo 7, se puede realizar un rebordeo de dicho borde externo 11. After bending the outer edge 11 of the circumferential flange 5 of the ring 7, a bending of said outer edge 11 can be made.
Finalmente, una vez se han realizado todas las operaciones de separado de la parte superior 4 del cuerpo principal 2 del envase 6, escalonado, y las operaciones de rebordeo y doblado en el anillo 7, queda conformados totalmente el envase 6 y el anillo 7 complementario a éste, y dicho anillo 7 queda dispuesto para recibir un engomado del canal 13, lo que proporciona un cierre hermético del envase con su tapa, ya que el engomado actúa de junta de estanqueidad. Finally, once all the operations of separating the upper part 4 from the main body 2 of the container 6 have been carried out, staggered, and the beading and bending operations on the ring 7, the container 6 and the complementary ring 7 are fully formed. to this, and said ring 7 is arranged to receive a gumming of the channel 13, which provides a hermetic closure of the container with its lid, since the gumming acts as a sealing gasket.
De acuerdo con una realización particular de la invención, y en el caso concreto que el barniz inicial no llevara incorporado propileno, una vez finalizado el anillo 7, se añade barniz con propileno y se realiza el termosellado de la membrana central 10 sobre el escalón 9, la cual cierra el hueco central 8, quedando la tapa 15 finalizada y lista para fijarse al envase 6 cerrando éste, una vez el contenido ha sido introducido. According to a particular embodiment of the invention, and in the specific case that the initial varnish did not incorporate propylene, once ring 7 is finished, varnish with propylene is added and the central membrane 10 is heat sealed on step 9 , which closes the central hole 8, leaving the lid 15 finished and ready to be fixed to the container 6, closing it, once the content has been introduced.

Claims

REIVINDICACIONES
1. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, caracterizado por que comprende: una etapa de embutición a una chapa metálica (1) en la que por medio de al menos una prensa se obtiene un cuerpo cilindrico (2) con una base inferior (3) cerrada y una parte superior (4) abierta, una etapa de recorte de la parte superior (4) del cuerpo cilindrico (2), y separación de dicha parte superior (4), el cuerpo cilindrico (2) restante originando un envase de lata (6), y la parte superior (4) separada originando un anillo (7), que comprende un hueco central (8), y un borde interno (12) delimitando dicho hueco central (8), realizándose un escalón (9) en el anillo (7) mediante una operación de escalonado alrededor del hueco central (8), para el apoyo y sellado de una membrana central (10) configurada para cerrar el hueco central (8), y operaciones de rebordeo y doblado en el anillo (7) para la eliminación de aristas cortantes y cierre de bordes. 1. Method of joint manufacturing of tin container and its lid with removable central membrane, characterized in that it comprises: a stage of drawing into a metal sheet (1) in which a cylindrical body (1) is obtained by means of at least one press ( 2) with a lower base (3) closed and an upper part (4) open, a step of cutting the upper part (4) of the cylindrical body (2), and separating said upper part (4), the cylindrical body (2) remaining originating a tin container (6), and the upper part (4) separated originating a ring (7), which comprises a central hollow (8), and an internal edge (12) delimiting said central hollow (8 ), a step (9) being made in the ring (7) by means of a staggering operation around the central gap (8), to support and seal a central membrane (10) configured to close the central gap (8), and bending and bending operations in the ring (7) for the elimination of sharp edges and edge closure.
2. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según la reivindicación 1, en el que en la etapa de embutición de la chapa metálica (1) se conforma en la parte superior (4) abierta un ala circunferencial (5), y el anillo (7) originado en la etapa de recorte de la parte superior (4) comprende adicionalmente dicha ala circunferencial (5), que comprende a su vez un borde externo (11). 2. A joint manufacturing method for a tin container and its lid with a central removable membrane, according to claim 1, wherein in the stage of drawing the metal sheet (1) a wing is formed in the upper part (4) open circumferential (5), and the ring (7) originated in the step of cutting the upper part (4) further comprises said circumferential wing (5), which in turn comprises an outer edge (11).
3. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según la reivindicación 1, en el que en el anillo (7) originado en la etapa de recorte de la parte superior (4) se conforma un ala circunferencial (5) que comprende a su vez un borde externo (11). 3. Method of joint manufacturing of tin container and its lid with removable central membrane, according to claim 1, in which a circumferential wing is formed in the ring (7) originated in the step of cutting the upper part (4) (5) which in turn comprises an outer edge (11).
4. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según cualquiera de las reivindicaciones anteriores, en el que antes de la etapa de embutición a la chapa metálica (1) se le aplica un barniz que comprende propileno. 4. A joint manufacturing method for a tin container and its lid with a central detachable membrane, according to any of the preceding claims, in which a varnish comprising propylene is applied to the metal sheet (1) before the embossing step.
5 Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según cualquiera de las reivindicaciones 1 a 3, en el que se aplica propileno al anillo (7) para el sellado de la membrana central (10).. 5 Joint manufacturing method of the can container and its lid with a removable central membrane, according to any of claims 1 to 3, in which propylene is applied to the ring (7) for sealing the central membrane (10).
6. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según cualquiera de las reivindicaciones 1 a 3, en el que antes de la etapa de embutición, a la chapa metálica (1) se le aplica una lámina de plástico. 6. Method of joint manufacturing of tin container and its lid with removable central membrane, according to any of claims 1 to 3, in which before the embossing step, a sheet of metal is applied to the metal sheet (1) plastic.
7. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según cualquiera de las reivindicaciones anteriores, en el que la etapa de embutición de la chapa metálica (1) se realiza en dos fases diferentes. 7. A joint manufacturing method for a tin container and its lid with a removable central membrane, according to any of the preceding claims, in which the stage of drawing the metal sheet (1) is carried out in two different phases.
8. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según la reivindicación anterior, en el que las dos fases diferentes de la etapa de embutición de la chapa metálica (1) se realizan en dos prensas diferentes. 8. Method of joint manufacturing of tin container and its lid with removable central membrane, according to the preceding claim, in which the two different phases of the stage of drawing the metal sheet (1) are carried out in two different presses.
9. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según cualquiera de las reivindicaciones anteriores, en el que en la etapa de embutición se da una forma y rebajado determinado a la base inferior (3) cerrada del cuerpo cilindrico (2). 9. Method of joint manufacturing of tin container and its lid with removable central membrane, according to any of the preceding claims, wherein in the drawing stage a certain shape and recess is given to the closed lower base (3) of the body. cylindrical (2).
10. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según cualquiera de las reivindicaciones anteriores, en el que el escalón (9) para el apoyo y sellado de la membrana central (10) se realiza en la etapa de embutición, antes de la etapa de recorte de la parte superior (4) del cuerpo cilindrico (2). 10. A joint manufacturing method for a tin container and its lid with a removable central membrane, according to any of the preceding claims, in which the step (9) for supporting and sealing the central membrane (10) is performed in the step of drawing, before the step of cutting the upper part (4) of the cylindrical body (2).
11. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según la reivindicación anterior, en el que tras la etapa de recorte de la parte superior (4) del cuerpo cilindrico (2) se realiza un doblado del borde externo (11) del ala circunferencial (5) del anillo (7) que origina un canal (13). 11. Method of joint manufacturing of tin container and its lid with removable central membrane, according to the preceding claim, in which after the step of cutting the upper part (4) of the cylindrical body (2), a bending of the edge is carried out external (11) of the circumferential flange (5) of the ring (7) that originates a channel (13).
12. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según cualquiera de las reivindicaciones 1 a 9, en el que el escalón (9) para el apoyo y sellado de la membrana central (10) se realiza tras la etapa de recorte de la parte superior (4) del cuerpo cilindrico (2). 12. A joint manufacturing method for a tin container and its lid with a removable central membrane, according to any of claims 1 to 9, in which the step (9) for supporting and sealing the central membrane (10) is carried out after the step of cutting the upper part (4) of the cylindrical body (2).
13. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según la reivindicación anterior, en el que tras la operación de escalonado se realiza un doblado del borde externo (11) del ala circunferencial (5) del anillo (7) que origina un canal (13). 13. Method of joint manufacturing of can container and its lid with removable central membrane, according to the preceding claim, in which after the stepped operation a bending of the outer edge (11) of the circumferential flange (5) of the ring (5) is carried out. 7) that originates a channel (13).
14. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según cualquiera de las reivindicaciones 11,13, en el que tras el doblado del borde externo (11) del ala circunferencial (5) del anillo (7) se realiza un enrollado del borde interno (12) del anillo (7). 14. A joint manufacturing method for a tin container and its lid with a removable central membrane, according to any of claims 11,13, wherein after bending the outer edge (11) of the circumferential flange (5) of the ring (7) a winding of the inner edge (12) of the ring (7) is carried out.
15. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según la reivindicación anterior, en el que el enrollado del borde interno (12) del anillo (7) se realiza en dos operaciones independientes consecutivas. 15. Method of joint manufacturing of tin container and its lid with removable central membrane, according to the preceding claim, in which the winding of the inner edge (12) of the ring (7) is carried out in two consecutive independent operations.
16. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según cualquiera de las reivindicaciones 11,13, en el que tras el doblado del borde externo (11) del ala circunferencial (5) del anillo (7) se realiza un rebordeo de dicho borde externo (11). 16. A joint manufacturing method for a tin container and its lid with a removable central membrane, according to any of claims 11,13, wherein after bending the outer edge (11) of the circumferential flange (5) of the ring (7) a flange is made of said outer edge (11).
17. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según cualquiera de las reivindicaciones anteriores, en el que tras la realización del escalonado y las operaciones de rebordeo y doblado en el anillo (7) se realiza un engomado del canal (13). 17. Method of joint manufacturing of tin container and its lid with removable central membrane, according to any of the preceding claims, in which after carrying out the step and the operations of beading and bending in the ring (7), a gumming is carried out channel (13).
18. Método de fabricación conjunta de envase de lata y su tapa con membrana central desprendible, según cualquiera de las reivindicaciones anteriores, que comprende una etapa de recorte de material sobrante del ala circunferencial (5) en una estación recortadora, tras la etapa de embutición a la chapa metálica (1). 18. Method of joint manufacturing of tin container and its lid with removable central membrane, according to any of the preceding claims, comprising a step of cutting excess material from the circumferential flange (5) in a cutting station, after the embossing step. to the metal sheet (1).
PCT/ES2020/070155 2020-03-04 2020-03-04 Method for jointly manufacturing a tin container and its lid with a detachable central membrane WO2021176112A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023169659A1 (en) 2022-03-08 2023-09-14 Soudronic Ag Packaging made of sheet metal material with tear-off foil lid and material set, and method for producing same

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US4262510A (en) * 1979-07-11 1981-04-21 American Can Company Support pedestals
EP0980726A2 (en) * 1998-08-20 2000-02-23 VAW Aluminium AG Method of making a lockable container
EP1029613A1 (en) * 1996-06-24 2000-08-23 Impress GmbH & Co. oHG Making cover rings from blanks without loss of material
EP1375025A1 (en) * 2002-06-27 2004-01-02 Alcan Technology & Management AG Method of making a container body and container end bordering ring
EP1410859A1 (en) * 2002-06-05 2004-04-21 Jose Penalver Garcia Edging/gumming machine for non-circular metal covers intended for containers

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
US4262510A (en) * 1979-07-11 1981-04-21 American Can Company Support pedestals
EP1029613A1 (en) * 1996-06-24 2000-08-23 Impress GmbH & Co. oHG Making cover rings from blanks without loss of material
EP0980726A2 (en) * 1998-08-20 2000-02-23 VAW Aluminium AG Method of making a lockable container
EP1410859A1 (en) * 2002-06-05 2004-04-21 Jose Penalver Garcia Edging/gumming machine for non-circular metal covers intended for containers
EP1375025A1 (en) * 2002-06-27 2004-01-02 Alcan Technology & Management AG Method of making a container body and container end bordering ring

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023169659A1 (en) 2022-03-08 2023-09-14 Soudronic Ag Packaging made of sheet metal material with tear-off foil lid and material set, and method for producing same

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