EP2574558A1 - Procédé pour la fermeture de boîtes métalliques - Google Patents
Procédé pour la fermeture de boîtes métalliques Download PDFInfo
- Publication number
- EP2574558A1 EP2574558A1 EP11183555A EP11183555A EP2574558A1 EP 2574558 A1 EP2574558 A1 EP 2574558A1 EP 11183555 A EP11183555 A EP 11183555A EP 11183555 A EP11183555 A EP 11183555A EP 2574558 A1 EP2574558 A1 EP 2574558A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lid
- metal
- seaming
- deformed
- inwardly directed
- 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.)
- Ceased
Links
Images
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
- B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
- B21D51/2653—Methods or machines for closing cans by applying caps or bottoms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B29/00—Packaging of materials presenting special problems
- B65B29/08—Packaging of edible materials intended to be cooked in the package
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B7/00—Closing containers or receptacles after filling
- B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
- B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
- B65B7/2842—Securing closures on containers
- B65B7/285—Securing closures on containers by deformation of the closure
- B65B7/2857—Securing closures on containers by deformation of the closure and the container rim
Definitions
- the present invention relates to a process for closing a metal can body, suitable for containing an edible product, with a can lid.
- Canning is the process of preserving an edible product by processing and sealing it in an airtight metal can.
- Cans are typically either two-piece or three-piece cans.
- a can body is formed by punching a metal plate to form a cylinder closed at one end. The can is then filled and the open end closed by seaming a lid to the can body during the canning process.
- a can body open at both ends, is formed by rolling and seaming a metal plate. A first end is closed by seaming a lid to the can body. The can is then filled and the second end closed by seaming a lid to the can body during the canning process.
- a metal can Once a metal can has been filled and sealed, it is typically heated in order to cook and/or sterilise the edible product and interior of the can. Heating the can in this way increases the internal pressure of the can. Cooking generally takes place within a cooker referred to as a "retort".
- the retort pressure is set in an attempt to balance the internal and external pressures to which the can is subjected, i.e. to minimise the pressure differential and the stresses to which the can is subjected.
- This pressure balancing allows the metal thickness, and therefore costs, of the cans to be reduced because it minimises the possibility that the cans will fail during the cooking process. Nonetheless, in some retorts this pressure balancing is not precise, and cans are still subjected to large pressure differentials during the cooking process, requiring that the cans have some minimum level of structural integrity.
- cans are filled with a hot product prior to seaming the end closure onto the can body.
- the internal pressure is reduced relative to the external pressure. It is sometimes desirable to minimise this negative pressure, again as a way of reducing the metal thickness.
- FR 1,119,542 and in FR 2,753,684 describe can lid structures and canning processes with the aim of mitigating this problem. Specifically, lids are provided which deform inwardly, in a concave manner, following seaming and cooling. As well as reducing the negative pressure, the lids are able to temporarily return to their original, flat, position when the can and its contents are subsequently heated (e.g. during a cooking and/or sterilisation process) in order to minimise the increase in internal pressure.
- a process for closing a metal can body suitable for containing an edible product, with a can lid, to provide a metal can suitable for heating in a retort.
- the process comprises: placing a metal lid over and in contact with an open end of a metal can body; applying an inwardly directed mechanical force to the lid such that at least a central portion of the lid is deformed into the interior space of the metal can body; and seaming the lid to the can body to form an airtight seal between the lid and the can body.
- Embodiments of the present invention provide an improved process for closing metal cans with lids that are able to withstand an increase in internal pressure without having to increase thickness of the metal used to form the can body and/or the lid.
- Particularly preferred embodiments may provide an improved process for closing metal cans with lids that are able to withstand an increase in internal pressure even when the thickness of the metal used to form the can body and/or the lid is reduced.
- the improved process forms a concave deformation in the lid which is independent of the filling temperature of the metal can, and which enables the metal can to better withstand extreme positive and negative pressure differentials.
- the process can be carried out without requiring existing canning machines to be modified in order to accommodate a lid with a side profile of greater thickness.
- the step of seaming the lid to the can body may be carried out before the step of applying an inwardly directed mechanical force, or the step of seaming the lid to the can body may be carried out after the step of applying an inwardly directed mechanical force.
- the step of seaming the lid to the can body may be carried out after the step of applying an inwardly directed mechanical force.
- the central portion of the lid may be deformed inwardly to the extent that the headspace volume inside the metal can is reduced by between 50% and 100%.
- the metal can may be cylindrical and the lid may be circular.
- the lid may be deformed by the inwardly directed force to a generally more domed shape.
- the lid may comprise one or more beads extending across the surface.
- the lid Prior to being deformed, the lid may be capable of passing horizontally through a slot having an opening of less than 6mm for a lid of nominally 153mm diameter.
- the extreme positive and negative pressure differentials to which metal cans are subjected during a cooking/sterilisation process can cause the structural integrity of the can to fail.
- a new process for seaming a lid onto a can will now be described, with reference to the figures, that mitigates these extreme positive and negative pressure differentials and the problems arising from them.
- the sealed can resulting from the process is capable of withstanding both negative and positive internal pressure with respect to an ambient external pressure. This is facilitated by deforming a substantially flat lid immediately before seaming the lid onto the can body.
- Substantially flat in this context is taken to mean that the overall profile of the lid is flat, such that any corrugations in the centre panel profile (i.e. the central portion of the lid) do not project above the seaming panel or below the bottom of the countersink.
- Figure 1 is a flow diagram which describes the steps of a canning process which includes a process for closing the metal can according to an embodiment of the present invention. The steps of the process are as follows:
- the edible product can be hot or cold as it is transferred into the can body.
- the can body may be intended to form a "two-piece" can, whereby the first piece is the body of the can which is formed by punching the body from a sheet of metal, and the second piece is the lid that is used to seal close the open end of the metal can.
- the can body may be intended to form a "three-piece” can, whereby the body of the can has two open ends, and is closed at each open end by a lid.
- an "open can” may be a two-piece can with no lid, or a three-piece can which is closed by a lid at only one of the two open ends.
- a substantially flat lid is placed over and in contact with the open end of the can.
- the substantially flat lid may be a lid such as that described in FR 1,119,542 .
- Figure 2 shows an example of a lid 1 that may typically be used in the process according to an embodiment of the present invention.
- the lid is substantially flat such that it can pass through existing size restrictions within standard machines used in a manufacturing and/or canning factory without any substantial adjustments being required to the machinery. Typically, size restrictions within such machinery are such that the lids of nominally 153mm diameter would be able to pass horizontally through a slot with a height of less than 6 mm.
- the lid of Figure 2 is made deformable by circular beads that form an area of circular corrugation 2 extending radially inwards from the outside edge of the lid 3 towards a flat central part of the lid 4.
- Figure 3 is a cross sectional view of a lid at step A2 of the process.
- the lid is loosely placed onto the open end of a metal can body.
- the corrugated portion is shown in area 2 of the lid, and the flat central portion is shown in area 4 of the lid.
- Figure 3 also shows a forming block, or "punch", 5, which may be part of a can seaming tool.
- the punch 5 although not shown as such in Figures 3 and 4 , may have a lower surface that conforms to the shaped profile of the lid.
- the punch 5 is used to apply a downward force F on the lid 1 in Step A3 and as shown in Figure 4 .
- the side wall of the metal can body provides an opposing force to hold the outside edge of the lid in place.
- a central region of the lid is deformed part way into the interior space of the metal can.
- This deformation gives the lid a generally more inwardly domed shape.
- Some of the air from the top of the can between the edible product and the lid (known as the "headspace") is displaced.
- the lid is only held in place on top of the metal can body by the punch 5 that is applying the force F, and is not yet seamed to the can body. Therefore, the air displaced from the headspace is able to escape the metal can through the unsealed gap between the lid and the side wall of the can body.
- the lid is then seamed to the metal can in step A4 to create an airtight seal between the lid and the can body.
- the force F may still be applied to the lid while the seaming process is carried out.
- Figure 5 is a cross section through the lid after step A4.
- the dotted line 8 in Figure 5 shows the original position and shape of the lid in Step A2, and the arrow A shows the extent of the concave deformation.
- the lid is deformed to the extent that the headspace volume of the metal can (i.e. the volume of air in the headspace of the can) is reduced by between 50% and 100%.
- the can is then heated in a retort in order to cook and/or sterilise the edible product inside in Step A5.
- the lid can be "pushed out” by the rise in internal pressure within the metal can to form a convex deformation, or dome, such as that shown in Figure 6 .
- the dotted line 10 shows the position and shape of the lid after seaming and prior to the can being heated.
- the arrow B shows the extent to which the lid is deformed by the increase in internal pressure.
- the embodiments described herein refer to a metal can body of circularly cylindrical shape and a circular lid.
- the can body and lid are not restricted to these shapes, and may, for example, be generally square cylindrical and square respectively. Further examples may include elliptical or rectangular lids, and suitably shaped respective can bodies.
- the process may also comprise in Step A3 applying an inwardly directed force on a central region of a second lid that is seamed to the bottom of the metal can to elastically deform the bottom lid into the can to allow a larger volume of air to be displaced from inside the can prior to seaming the top lid onto the open end of the can body.
- a further alternative may be that the can body does not contain the edible product and is not sealed at the bottom at the time the lid is deformed and seamed to the top end of the can.
- the substantially flat lid once the substantially flat lid has been placed over and in contact with the top open end of the can body, it can either be deformed first by a downwards pressure and then seamed to the can body, or it can be seamed first and then deformed by the downwards pressure. Even if the lid is seamed to the can body first, the air displaced when deforming the lid is able to escape the can through the open bottom. The can body with the deformed top can then be filled through the opening in the bottom prior to it being sealed with a can bottom.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Containers With Two Or More Constituent Elements (AREA)
- Closures For Containers (AREA)
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11183555A EP2574558A1 (fr) | 2011-09-30 | 2011-09-30 | Procédé pour la fermeture de boîtes métalliques |
MX2014003809A MX343211B (es) | 2011-09-30 | 2012-09-10 | Proceso para cerrar latas de metal. |
ES12759411.7T ES2613095T3 (es) | 2011-09-30 | 2012-09-10 | Procedimiento para cerrar latas de metal |
PCT/EP2012/067620 WO2013045263A1 (fr) | 2011-09-30 | 2012-09-10 | Processus de fermeture de boîtes métalliques |
HUE12759411A HUE031786T2 (en) | 2011-09-30 | 2012-09-10 | Method for closing metal boxes |
US14/348,086 US20150290699A1 (en) | 2011-09-30 | 2012-09-10 | Process for closing metal cans |
EP12759411.7A EP2760744B1 (fr) | 2011-09-30 | 2012-09-10 | Procédé pour la fermeture de boîtes métalliques |
CA2850244A CA2850244C (fr) | 2011-09-30 | 2012-09-10 | Processus de fermeture de boites metalliques |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11183555A EP2574558A1 (fr) | 2011-09-30 | 2011-09-30 | Procédé pour la fermeture de boîtes métalliques |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2574558A1 true EP2574558A1 (fr) | 2013-04-03 |
Family
ID=46851968
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11183555A Ceased EP2574558A1 (fr) | 2011-09-30 | 2011-09-30 | Procédé pour la fermeture de boîtes métalliques |
EP12759411.7A Not-in-force EP2760744B1 (fr) | 2011-09-30 | 2012-09-10 | Procédé pour la fermeture de boîtes métalliques |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12759411.7A Not-in-force EP2760744B1 (fr) | 2011-09-30 | 2012-09-10 | Procédé pour la fermeture de boîtes métalliques |
Country Status (7)
Country | Link |
---|---|
US (1) | US20150290699A1 (fr) |
EP (2) | EP2574558A1 (fr) |
CA (1) | CA2850244C (fr) |
ES (1) | ES2613095T3 (fr) |
HU (1) | HUE031786T2 (fr) |
MX (1) | MX343211B (fr) |
WO (1) | WO2013045263A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10010926B2 (en) | 2013-10-28 | 2018-07-03 | Ball Corporation | Method for filling, seaming, distributing and selling a beverage in a metallic container at a single location |
US20170355495A1 (en) | 2016-06-08 | 2017-12-14 | N2 Packaging Systems, Llc | Child resistant and senior friendly can lid |
US11958666B2 (en) | 2017-06-07 | 2024-04-16 | N2 Packaging Systems, Llc | Child resistant double seam container lid |
US11834237B2 (en) | 2017-06-07 | 2023-12-05 | N2 Packaging Systems, Llc | Child resistant double seam container lid adapter ring |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1119542A (fr) | 1955-02-12 | 1956-06-21 | Perfectionnements apportés aux fonds et couvercles pour boîtes, bidons ou fûts en métal ou matières plastiques | |
US4180959A (en) * | 1977-10-31 | 1980-01-01 | Hempel Robert P Jr | Machine for sealing food containers |
EP0127155A1 (fr) * | 1983-05-27 | 1984-12-05 | Alcan Ohler GmbH | Procédé et dispositif pour fermer un récipient avec un couvercle, qui consistent tour les deux en un matériau plastique déformable |
US4967538A (en) * | 1988-01-29 | 1990-11-06 | Aluminum Company Of America | Inwardly reformable endwall for a container and a method of packaging a product in the container |
FR2753684A1 (fr) | 1996-09-25 | 1998-03-27 | Lorraine Laminage | Fond de boite metallique alimentaire |
WO2001019683A1 (fr) * | 1999-09-10 | 2001-03-22 | Societe Des Produits Nestle S.A. | Procede de production d'un conteneur hermetique destine aux produits cuits au four ou aux produits similaires |
US20100116374A1 (en) * | 2008-11-11 | 2010-05-13 | Crown Packaging Technology, Inc. | Method of assembling an easy open container |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4321330A (en) * | 1980-04-04 | 1982-03-23 | Baker Fraser L | Tissue culture device |
JPS59144535A (ja) * | 1983-02-03 | 1984-08-18 | Kyocera Corp | 缶蓋巻締用工具 |
US5021351A (en) * | 1983-05-02 | 1991-06-04 | Becton, Dickinson And Company | Petri dish |
GB8412244D0 (en) * | 1984-05-14 | 1984-06-20 | Metal Box Plc | Containers |
CH668754A5 (de) * | 1985-07-10 | 1989-01-31 | Grabher Indosa Maschbau Ag | Verfahren zum verschliessen eines dosenartigen behaelters mittels einer membran. |
US20030021920A1 (en) * | 2002-08-06 | 2003-01-30 | Williamson James T. | Container forming method and product |
US7757879B2 (en) * | 2005-11-29 | 2010-07-20 | Sonoco Development, Inc. | Container lid formed as a laminate having a built-in opening feature, container incorporating same, and method of making same |
US7559222B2 (en) * | 2006-07-20 | 2009-07-14 | Crown Packaging Technology, Inc. | Method for testing can ends |
DK1982928T3 (da) * | 2007-04-18 | 2011-04-18 | Impress Group Bv | Sæt af dele omfattende en ring, en folie og et låg, formonterede sæt af dele, fremgangsmåde til fremstilling af et sæt samt fremgangsmåde til fremstilling af en beholder |
US9085026B2 (en) * | 2009-07-07 | 2015-07-21 | Crown Packaging Technology, Inc. | High speed seaming assembly |
-
2011
- 2011-09-30 EP EP11183555A patent/EP2574558A1/fr not_active Ceased
-
2012
- 2012-09-10 WO PCT/EP2012/067620 patent/WO2013045263A1/fr active Application Filing
- 2012-09-10 US US14/348,086 patent/US20150290699A1/en not_active Abandoned
- 2012-09-10 CA CA2850244A patent/CA2850244C/fr not_active Expired - Fee Related
- 2012-09-10 ES ES12759411.7T patent/ES2613095T3/es active Active
- 2012-09-10 HU HUE12759411A patent/HUE031786T2/en unknown
- 2012-09-10 EP EP12759411.7A patent/EP2760744B1/fr not_active Not-in-force
- 2012-09-10 MX MX2014003809A patent/MX343211B/es active IP Right Grant
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1119542A (fr) | 1955-02-12 | 1956-06-21 | Perfectionnements apportés aux fonds et couvercles pour boîtes, bidons ou fûts en métal ou matières plastiques | |
US4180959A (en) * | 1977-10-31 | 1980-01-01 | Hempel Robert P Jr | Machine for sealing food containers |
EP0127155A1 (fr) * | 1983-05-27 | 1984-12-05 | Alcan Ohler GmbH | Procédé et dispositif pour fermer un récipient avec un couvercle, qui consistent tour les deux en un matériau plastique déformable |
US4967538A (en) * | 1988-01-29 | 1990-11-06 | Aluminum Company Of America | Inwardly reformable endwall for a container and a method of packaging a product in the container |
FR2753684A1 (fr) | 1996-09-25 | 1998-03-27 | Lorraine Laminage | Fond de boite metallique alimentaire |
WO2001019683A1 (fr) * | 1999-09-10 | 2001-03-22 | Societe Des Produits Nestle S.A. | Procede de production d'un conteneur hermetique destine aux produits cuits au four ou aux produits similaires |
US20100116374A1 (en) * | 2008-11-11 | 2010-05-13 | Crown Packaging Technology, Inc. | Method of assembling an easy open container |
Also Published As
Publication number | Publication date |
---|---|
MX2014003809A (es) | 2014-06-04 |
MX343211B (es) | 2016-10-27 |
CA2850244C (fr) | 2019-03-12 |
US20150290699A1 (en) | 2015-10-15 |
WO2013045263A1 (fr) | 2013-04-04 |
ES2613095T3 (es) | 2017-05-22 |
CA2850244A1 (fr) | 2013-04-04 |
EP2760744B1 (fr) | 2016-11-02 |
HUE031786T2 (en) | 2017-08-28 |
EP2760744A1 (fr) | 2014-08-06 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
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AX | Request for extension of the european patent |
Extension state: BA ME |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
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18R | Application refused |
Effective date: 20130909 |