EP3604155A1 - Konservendose mit flexiblem boden und entsprechendes herstellungsverfahren - Google Patents

Konservendose mit flexiblem boden und entsprechendes herstellungsverfahren Download PDF

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Publication number
EP3604155A1
EP3604155A1 EP19186177.2A EP19186177A EP3604155A1 EP 3604155 A1 EP3604155 A1 EP 3604155A1 EP 19186177 A EP19186177 A EP 19186177A EP 3604155 A1 EP3604155 A1 EP 3604155A1
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EP
European Patent Office
Prior art keywords
flexible
box
metal body
bottoms
boxes
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.)
Granted
Application number
EP19186177.2A
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English (en)
French (fr)
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EP3604155B1 (de
Inventor
Jean-Michel Guerin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
D'aucy France
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Generale De Conserve Cie
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Filing date
Publication date
Priority claimed from FR1557949A external-priority patent/FR3040377B1/fr
Application filed by Generale De Conserve Cie filed Critical Generale De Conserve Cie
Publication of EP3604155A1 publication Critical patent/EP3604155A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/50—Non-integral frangible members applied to, or inserted in, preformed openings, e.g. tearable strips or plastic plugs
    • B65D17/501—Flexible tape or foil-like material
    • B65D17/502—Flexible tape or foil-like material applied to the external part of the container wall only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D15/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, sections made of different materials
    • B65D15/02—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, sections made of different materials of curved, or partially curved, cross-section, e.g. cans, drums
    • B65D15/10—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, sections made of different materials of curved, or partially curved, cross-section, e.g. cans, drums with curved, or partially curved, walls made of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
    • B65D7/12—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls

Definitions

  • the field of the invention is that of the food industry.
  • the invention relates more particularly to containers intended for the preservation of food for a long period.
  • the invention also relates to the bottoms and the method of manufacturing such containers.
  • Metal cans allow long-term storage of the food they contain. They consist of a metallic body and two rigid metallic bottoms which are generally joined to the body by crimping to make it a sealed container.
  • the food products contained in these boxes once they are closed, undergo a heat treatment at high temperature, in particular at a temperature above 110 ° C. (sterilization). In this way, these food products can be stored for several months at room temperature.
  • the body of the box is generally subjected to positive and / or negative pressure constraints depending on the process used, which can cause deformation of the packaging and cause a variation in the internal volume of the box.
  • positive and / or negative pressure constraints depending on the process used, which can cause deformation of the packaging and cause a variation in the internal volume of the box.
  • the ring system aims to make it possible to easily open the boxes having a relatively large thickness of the metal bottom, making it possible to withstand variations in internal pressure.
  • This system implements, on one of the two metallic bottoms, a gripping ring allowing the opening of a part of the metallic bottom, previously weakened (by an incision, for example).
  • the peelable system implements a metal body and bottom, the box being closed by a cover consisting of a flexible peelable sheet secured to a conventional metallic bottom which is previously hollowed out.
  • the assembly is then crimped on the periphery of the upper part of the metal body.
  • the peelability is in particular and preferably measured according to the method described in FR 2955844 , peeling of the cover at 90 ° at a speed of 300 mm / min), making it possible to measure the initial tearing, flow and final tearing forces.
  • a drawback of this technique lies in the relatively high manufacturing cost of such a box.
  • the manufacturing process is substantially identical to that making it possible to obtain a conventional can but requires, in addition, steps for cutting the metal base and securing the flexible sheet to the metal base.
  • the present invention aims to solve the weaknesses of the solutions of the prior art and therefore provides a can comprising a metal body having an upper part hermetically closed by a first bottom formed by a flexible sheet.
  • said tin can comprises a metal body having an upper part hermetically closed by a first bottom and a lower part hermetically closed by a second bottom.
  • said first and second bottoms are each formed by a flexible sheet.
  • a tin can having, at one of its ends or at each of its ends, a bottom in the form of a film or a flexible sheet ("foil" in English).
  • the other bottom can in particular be a “classic” bottom, that is to say crimped to the metal body of the box according to the methods known in the prior art. It is also conceivable that the second bottom of the box is in fact in the same mass as the metal body, which is observed when the can is produced by stamping and / or drawing a metal sheet.
  • the body of such a box therefore undergoes less pressure constraints than a box body using conventional metallic bottoms, under industrial sterilization conditions.
  • the flexible bottom (s) contribute more to the variation in volume of the interior of the box than the rigid metallic bottoms.
  • the flexible bottom (s) used to close the boxes are not peelable bottoms, and that they must be fixed to the box in such a way that they can withstand the internal pressure of the box during the sterilization, if necessary.
  • the invention is based on the use of a flexible film for sealing at least one end of a can type can, without said film being peelable.
  • the invention in a first aspect, relates to a tin can comprising a metal body having one end hermetically closed by a first bottom formed by a flexible sheet.
  • a metal body having one end hermetically closed by a first bottom formed by a flexible sheet.
  • the internal pressure of the hermetically sealed box is equal to atmospheric pressure or may be slightly lower than the pressure atmospheric.
  • This aspect of the invention aims in particular to solve the problem of the deformation of the “lower” bottom of the box after filling (the internal depression makes it possible to compensate for the weight of the contents of the box and to avoid a convex deformation of the flexible bottom, ie towards the outside of the box).
  • This aspect of the invention aims in particular to ensure, on the one hand, maximum protection of the flexible bottom in the stages of logistics, handling, conveying and storage of the can, possibly also allowing slight deformation of the flexible bottom towards the inside the package (concave deformation).
  • the fact of avoiding the convex deformation, and even of generating a concave deformation of the flexible bottom also makes it possible to ensure a better guarantee of acceptability of the product by the consumer. Indeed, the presence of a convex bottom (curved towards the outside of the packaging) could make one think of a product that is not stable or unfit for consumption (curved).
  • the invention in another aspect, relates to a tin can comprising a metal body having at least one end hermetically closed by a bottom formed by a flexible sheet, welded on the upper part of said metal body, and such that the upper part welded from said metallic body of the box is folded / rolled so as to form a peripheral hem at said end of the box.
  • a tin can comprising a metal body having at least one end hermetically closed by a bottom formed by a flexible sheet, welded on the upper part of said metal body, and such that the upper part welded from said metallic body of the box is folded / rolled so as to form a peripheral hem at said end of the box.
  • at least one film may or may not be peelable, or the films are fixed so that the box will withstand the sterilization conditions.
  • This aspect of the invention aims in particular to solve the technical problem of handling and storing boxes having one or more flexible bottoms, said hem allowing protection of the flexible bottom (s) in particular on industrial chains or during placement. on the shelves at the point of sale. Depending on the shape of the hem, it will also optimize the storage and storage of boxes.
  • the invention in another aspect, relates to a tin can having at least one bottom formed by a flexible sheet, said flexible sheet having a precut part.
  • the box can comprise two flexible bottoms, present (or not) an internal depression relative to atmospheric pressure and / or present (or not) peripheral hems formed by the rolling / folding of the end of the metal body.
  • This aspect of the invention aims to solve the technical problem of opening the box, by providing a technical solution (precut area) aimed at allowing easy opening of the box by facilitating the rupture of the flexible bottom.
  • the invention in another aspect, relates to a tin can (preferably filled with food products), having at least one bottom formed by a flexible sheet, the internal pressure in said tin being less than atmospheric pressure under the conditions ambient.
  • said flexible sheet comprises at least one metallic layer, such as an aluminum layer.
  • this metal layer is also useful for serving as a gas-tight barrier.
  • the flexible bottoms which can be used to close one or both ends of the can can thus be formed from several layers, and are known in the art and therefore obtained by known methods, such as lamination. However, one of its layers should allow the welding with the body of the box.
  • the cans according to the invention must be able to withstand the sterilization conditions necessary to ensure the preservation of the products.
  • sterilization is a heat treatment of a foodstuff aimed at the destruction of microorganisms even spore-forming, and the enzymes which are sources of spoilage of the products (core temperature of the product above 105 ° C), and cook the product.
  • Fo sterilizing value
  • time-temperature couples which are applied to foodstuffs in order to sterilize them while maintaining a satisfactory organoleptic quality.
  • the sterilization conditions are established according to the characteristics of the product (initial contamination, pH, texture and initial temperature), the nature and format of the packaging (in particular the size of the cans) as well as the characteristics from the autoclave
  • the products to be sterilized can have various consistencies ranging from liquids such as fish soups, sauces, ...), to solids (foie gras, pâté, ...) while some products include liquids and solids (canned vegetables, meat in sauce).
  • the consistency of the product influences the distribution of heat in the product: the more liquid a product, the faster the heat diffuses.
  • the sterilization conditions depend on the nature of the products (vegetables or fruit, or other products) to be sterilized.
  • the temperature curves and durations of application of these temperatures to the boxes will depend on the products contained in these boxes.
  • the temperature rise is carried out by placing the box in the sterilizer and then raising the temperature of the sterilizer. In this embodiment, the rise in temperature within the box follows that of the sterilizer.
  • the box is placed in a sterilizer for which the temperature rise has already been carried out, which induces a thermal and pressure "shock" on the box.
  • the following conditions illustrate this embodiment.
  • the boxes can undergo an internal overpressure of between -1.7 and 1.3 bar.
  • the boxes can undergo an internal overpressure of between approximately -0.5 and approximately 1.1 bar (the term approximately signifying the specified value +/- 10%).
  • the cans can undergo an internal overpressure of between approximately -1.4 and approximately 1.3 bar (the term approximately signifying the specified value +/- 10%).
  • the cans can undergo an internal overpressure of between approximately -1.4 and approximately 1.5 bar (the term approximately signifying the specified value +/- 10%).
  • the boxes according to the invention resist internal overpressure (corresponding to the difference between the internal pressure in the box and the external pressure) greater than or equal to 0.7 bar, 0.8 bar, preferably greater than or equal to 0.9 bar, preferably greater than or equal to 1 bar, preferably greater than or equal to 1.05 bar, preferably greater than or equal to 1.1 bar, preferably greater than or equal to 1.15 bar , preferably greater than or equal to 1.2 bar.
  • the boxes resist internal overpressure of up to 1.5 bar.
  • the boxes must resist this internal overpressure for at least 2 minutes, preferably for at least 3 minutes, preferably for at least 4 minutes preferably for at least 5 minutes, preferably for at least 6 minutes, preferably for at least 7 minutes, preferably for at least 8 minutes, preferably for at least 9 minutes.
  • Such internal overpressure is obtained by any method known to those skilled in the art, using sterilizers / autoclaves known in the art. Internal and external pressures are measured by sensors placed respectively in the box and in the autoclave, the internal overpressure being the difference between the internal pressure and the external pressure.
  • the cans are considered to resist internal overpressure when their integrity is maintained after application of the internal overpressure for the time mentioned above. This means that the boxes do not “explode” under the effect of the overpressure, and that the flexible bottom is not torn off or destroyed under the effect of this overpressure.
  • the cans can undergo an external overpressure (that is to say that the external pressure will be greater than the internal pressure). This is particularly the case when the boxes are introduced into an enclosure already under the temperature and pressure conditions used for sterilization. The boxes (whose internal pressure is atmospheric pressure) then undergo an external overpressure of up to 2 bars. The boxes must therefore also resist this external overpressure. If we consider an internal depression in the box under ambient conditions (to play on the concavity of the flexible bottom), we will then preferentially choose to sterilize the boxes immediately after hot filling (i.e. when the temperature of the box is of the order of 35-40 ° C.), the internal pressure of the boxes then being close to atmospheric pressure.
  • an external overpressure that is to say that the external pressure will be greater than the internal pressure
  • the boxes according to the invention resist an external overpressure (corresponding to the difference between the pressure outside the box and the internal pressure) greater than or equal to 0.4 bar, preferably greater than or equal to 0.5 bar, preferably greater than or equal to 0.6 bar, preferably greater than or equal to 0.7 bar, preferably greater than or equal to 0.8 bar, preferably greater than or equal to 0.9 bar, preferably greater than or equal to 1 bar, preferably greater than or equal to 1.1 bar, preferably greater than or equal to 1.2 bar, preferably greater than or equal to 1.3 bar, preferably greater than or equal to 1.4 bar, preferably greater or equal to 1.5 bar, preferably greater than or equal to 1.6 bar, preferably greater than or equal to 1.7 bar.
  • an external overpressure corresponding to the difference between the pressure outside the box and the internal pressure
  • the boxes resist internal overpressure of up to 2 bar. This means that the boxes do not “implode” under the effect of the external overpressure, and that the flexible bottom is not torn off or destroyed under the effect of this overpressure. This external overpressure is generally observed for a duration generally less than 2 minutes, or even less than one minute.
  • the physical appearance of the boxes is not altered after sterilization, that is to say when the boxes retain their appearance (for example cylindrical if the metal body has been prepared in this form).
  • the boxes can deform (both outward and inward) during sterilization operations, it is preferred that these deformations are not irreversible, that is to say that the boxes return to their initial shape (ie the shape they had before entering the sterilizer) after the sterilization operations.
  • the boxes must resist an internal overpressure between -0.4 bar and 0.8 bar or any other value mentioned above, preferably without undergoing irreversible deformation (i.e. deformation of the metallic body which is maintained) after return to ambient conditions.
  • the negative internal overpressure corresponds to the external overpressure applied to the box.
  • the mass of the metal body is less than 50g (a conventional metal body of the prior art for this box format has a mass equal to 51g).
  • the mass of said metal body is less than 40g.
  • the thickness of the metal body of the box according to the invention is significantly reduced insofar as the metal body undergoes less stress than the metal body of a conventional tin can.
  • the mass of said flexible bottom is less than 10 g.
  • the mass of said flexible bottom is less than 5 g.
  • the mass of the flexible bottoms of the invention is significantly less than that of known box bottoms.
  • the mass of a classic rigid box bottom is equal to 16g
  • the mass of an easy opening bottom by grip ring is 22g
  • the mass of a peelable bottom is 10g.
  • the mass of said tin can according to the invention is less than 56g.
  • the mass of the can according to the invention is therefore reduced compared to cans of the prior art whose mass is generally between 77g and 89g.
  • the reduction in the thickness of the bottoms and the body of the can therefore allows a relatively large gain in mass, and therefore a reduction in the cost of the can.
  • said first and possibly second bottoms are welded to the upper part and the lower part respectively of said metallic body (in particular by heat-sealing).
  • the flexible bottoms are directly welded to the box, and more precisely to the flat metal of the body of the box, at the ends of the body.
  • the bottom (s) are welded on the inside face of the body of the box, on flat annular edges at the end of the body.
  • the initial breakout force to be applied in order to “peel” the bottoms of the metal body is therefore preferably greater than 25 N, more preferably greater than 28 N, or more than 30 N, even more preferably greater than 35 N.
  • the flexible bottoms of the box are in one piece, unlike the peelable bottoms developed under the EASIP® brand.
  • These Easip® peelable bases are constructed by placing a complex film based on aluminum on a steel or a steel or aluminum ring crimped on the body of the can (see for example WO 2012/072383 ), while the flexible bases described in the present application are directly welded to the body of the box.
  • the welding of the flexible bottoms is sufficiently robust to withstand the pressure constraints which arise during a heat treatment (sterilization) of the food content, and which are exerted, as previously emphasized, in part on the flexible bottoms.
  • the welding of the film on the body of the box is carried out by any method known in the art.
  • the edge of the box can be locally coated with a material capable of making heat sealing possible (organic and / or mineral material in which mineral and / or organic fillers can be incorporated, in particular polypropylene (PP)).
  • a material capable of making heat sealing possible organic and / or mineral material in which mineral and / or organic fillers can be incorporated, in particular polypropylene (PP)
  • PP polypropylene
  • This material will melt at the time of heat sealing, then cool down producing a solid seal, which allows the flexible fixing of the flexible sheet serving as a bottom.
  • the exact conditions type of material, welding conditions
  • These conditions are known in the art, the heat sealing of a film on a material, using, for example a flexible head heat sealer).
  • the films of the brand Fastelfoil TM Frastel Adhesive Products, San Clemente, CA, United States
  • the reference film PP320 for which the manufacturer is considering applying pressure between 3 and 10 psi (20 to 70 kPa) for 0.25 to 1 second at a temperature of 165 to 175 ° C.
  • the upper and / or lower welded parts of said metallic body of the box are respectively folded / rolled up so as to form a peripheral hem at each end of the box.
  • the invention thus relates to a tin can comprising a metal body having an upper part hermetically closed by a first bottom, characterized in that said first bottom is formed by a flexible sheet, and is welded to the upper part of said metal body , the welded upper part of said metallic body of the box being further folded / rolled so as to form a peripheral hem at the upper end of the box.
  • first bottom is formed by a flexible sheet, and is welded to the upper part of said metal body , the welded upper part of said metallic body of the box being further folded / rolled so as to form a peripheral hem at the upper end of the box.
  • the welding of the flexible bottoms on the box body is protected by a roll of the flat metal of the box body.
  • This roll, or hem, is prominent and protects the flexible bottoms (and the welding) during sterilization, transport, handling and storage of the box.
  • This mode of implementation is particularly suitable when the two bottoms of the box are made of flexible sheets.
  • the invention relates to a tin can comprising a metal body having an upper part hermetically closed by a first bottom and a lower part hermetically closed by a second bottom, characterized in that said first and second bottoms are each formed by a flexible sheet, said first and second bottoms being welded on the upper part and the lower part respectively of said metallic body, said upper and lower welded parts of said metallic body of the box being respectively folded / rolled so as to each form a peripheral hem at each end of the box.
  • the box or boxes thus obtained withstand the pressure conditions indicated above, even if this is preferred.
  • One or both flexible bottoms may therefore be peelable.
  • said hems are of different shapes.
  • the shape of the top bottom roll may be different from the shape of the bottom bottom roll and thus allow optimized stacking of such cans while protecting the flexible bottoms.
  • the funds described in the present application are not peelable funds as described in the prior art. They cannot therefore be detached from the body of the box by exerting a "reasonable" traction that a user would exert to open a flexible peelable bottom (ie of the order of 20 N).
  • said first bottom and / or said second bottom has (s) a precut part.
  • a tin can with one or two bottoms formed by a flexible sheet, and in which one and possibly the other flexible sheet has a precut part is an object of the invention.
  • the subject of the invention also includes any tin can thus defined, whether one or the other bottom is peelable, as long as at least one of the two funds has a pre-cut part as described above.
  • the box or boxes thus obtained withstand the pressure conditions indicated above, even if this is preferred.
  • a precut in particular by laser or other technology, is implemented on at least one of the two flexible bottoms. This allows the consumer to easily perforate the flexible base and thus open the can to access the food content. This precut is carried out once the heat treatment of the food content has been finalized, when the flexible base is no longer required to undergo strong pressure constraints so as not to degrade the latter. It is noted that this laser precut, common in the art, allows a partial incision of the flexible sheet, while maintaining air impermeability in order to maintain the quality and integrity of the product contained in the can. The flexible sheet is thus weakened along a breaking line corresponding to the location of the precut, which helps to open it.
  • the said precut part (s) is / are associated with visual marking.
  • the precut can be done on an ink pre-marking or the ink pre-marking can be done once the precut is finalized which will allow the consumer to better visualize the precut compared to the rest of the bottom of the box.
  • a tongue or a small gripping ring is glued, on the flexible bottom, and close to the pre-cut zone, which can be pulled by the end user, in order to induce the rupture of the zone. fragility, and thus improve the opening of the box.
  • the invention also relates to a method comprising a step of precutting a flexible bottom closing off one end of a can, said precut consisting of a partial incision of said flexible sheet, while maintaining the air impermeability of said background.
  • said metal body has the shape of a truncated cone.
  • This aspect makes it possible to limit the storage volume of boxes when the latter are empty, that is to say before filling or after use of the box in particular.
  • the invention also relates to a can bottom formed by a flexible sheet intended to be used in a can as described above.
  • the flexible sheet comprises a metallic layer (made of aluminum, for example) covered on at least one face by a plastic layer.
  • a flexible sheet made up of such a succession of layers of different materials makes it possible to ensure a strong solidity of the sheet so as to resist the pressure variations which take place during the heat treatment, for example.
  • the metal body is filled before the welding step above.
  • the manufacturing process further comprises a metal working step consisting in folding or rolling the welded part (before or after filling as the case may be) of said body of the box so as to form a peripheral hem at the end of the box, thus acting in particular as a protection of the flexible bottom.
  • the above process can also include a heat treatment step (sterilization) of the hermetically sealed can at both ends.
  • the manufacturing process also includes a step of precutting the flexible bottom in order to allow easy opening of the box.
  • This precut occurs preferably after the heat treatment since the latter causes high pressure constraints and it is therefore preferable that the flexible bottom is not weakened.
  • the invention also relates to a method for sterilizing a can as described above (comprising a metal body and hermetically closed by one or two flexible bottoms at (respectively) one or both ends of said metal body) , comprising a step of placing said box under conditions of temperature and pressure inducing an internal suppression (in said box) of at least 0.8 bar (or any other value as indicated above).
  • said box undergoes overpressure for at least 2 minutes (or any other duration indicated above, a preferred duration being greater than or equal to 6 minutes, or 7 minutes).
  • the manufacturing process further comprises a metal working step consisting in bending or rolling the lower welded part (before filling) then the upper welded part (after filling) of said body of the box so as to form a peripheral hem at each end of the box, thus acting as a protection of the flexible bottom.
  • the manufacturing process comprises a step of precut of at least one of the two flexible bottoms in order to allow easy opening of the box.
  • This precut occurs preferably after the heat treatment since the latter causes high pressure constraints and it is therefore preferable that the flexible bottom is not weakened.
  • Such a manufacturing process can be implemented efficiently, industrially.
  • the weight of the contents is likely to deform the lower flexible bottom.
  • the hem which can be placed at the lower end can protect the flexible bottom and prevent it from touching the plane on which the box is placed, including when it is deformed by the weight of the contents of the box ( due to sufficient space between (a) the point of contact of the hem and the storage plane and (b) the flexible bottom); the hem making conditions, and the space between the end of the hem and the flexible bottom are therefore adapted to the mass which the flexible bottom will have to undergo, as well as its resistance and its deformability).
  • the box can also be closed (setting up of the second base) under conditions such that the box will have a slight internal depression (of the order of 0.1 to 0.4 bar) relative to atmospheric pressure.
  • the external overpressure will exert a force opposite to the force exerted by the food (weight) on the external bottom, which will therefore not deform, or only marginally.
  • This internal depression (relative to atmospheric pressure) can be obtained by conducting the step of hermetically closing the box in an enclosure under vacuum.
  • the filling step which precedes this step of closing the box can also be carried out in this vacuum enclosure.
  • These operating conditions are particularly suitable when the content of the can is content at room temperature, in particular milk powder (in particular infant milk), chocolate powder, ground coffee, or the like.
  • this depression can be obtained under ambient conditions by closing the box when the products have been put hot in the box, and keeping a certain amount of air in the box. The trapped air is then at the temperature of the products. When the box is cooled, the cooling of the air will therefore induce the internal vacuum in the box. In this embodiment, it will preferably be chosen to introduce the box into the sterilization chamber before the latter cools down (that is to say when the temperature of the box is still greater than approximately 35 ° VS).
  • a tin can, closed by at least one flexible bottom at one of its ends (preferably closed by flexible bottoms at both ends), and which is in slight internal depression compared to atmospheric pressure, is also an object of the invention.
  • the invention therefore relates to a new type of tin can comprising one or two bottoms, or lids, in the form of a flexible sheet ("foil" in English).
  • a tin can differs from known tin cans which use rigid metallic bottoms (relatively thick) at each of their ends.
  • the particular structure of the can according to the invention makes it possible to reduce the metal requirements compared to the current cans and reduces the manufacturing costs.
  • the can 1 comprises a metal body 2 of cylindrical section.
  • the metal body 2 is secured at its two ends to a flexible bottom 3 for hermetically closing the can 1.
  • the metal body 2 which is preferably made of steel or aluminum, has, in longitudinal section, a substantially parallelepiped profile, as illustrated in the figure 2 .
  • the profile has two rectilinear and parallel walls 21 ending at each of their ends by annular flat parts 22, 23 which extend perpendicular to the walls 21, around the periphery of the opening (these flat parts 22, 23 are deliberately oversized on the figure 2 for clarity).
  • the flat parts 22, 23 are each intended to receive a flexible bottom.
  • flexible bottoms 3 taking the form of a flexible sheet (or "foll") 31, are affixed respectively to the upper 22 and lower 23 before being secured to the latter by welding (induction welding or by Joule effect, for example).
  • the weld must be strong enough / resistant to ensure optimal hold of the flexible bottoms 3 during the heat treatment (sterilization) of the can 1.
  • peripheral part or periphery 311 of the flexible sheet 31 is therefore directly welded to the flat annular parts 22, 23 of the metallic body 2.
  • the upper 22 and lower 23 parts are rolled up on themselves, as illustrated in the figure 5 .
  • This winding in double stapling ply for example, forms an upper hem 24 and a lower hem 25 respectively encompassing the upper part 22 and the lower part 23 of the metal body 2 and the peripheral part 311 of the corresponding flexible sheet 31.
  • Such a hem makes it possible to protect the flexible sheets 31 from shocks and friction which could possibly degrade the sealing of the box. can 1, especially when handling and transporting can 1 (in automatic conveyor systems, for example).
  • the upper hem 24 is oriented towards the inside of the can 1 and that the lower hem 25 is oriented towards the outside of the can 1. This allows stable stacking and optimized storage of the cans 1 on top of each other, as shown in the figure 6 . However, it is also possible to envisage an upper hem 24 oriented towards the outside of the can 1 and a lower hem 25 oriented towards the inside of the can 1.
  • the flexible base 3 of the invention is formed by a flexible sheet 31 consisting of one or more layers.
  • the layers can be made of different materials, such as polypropylene, aluminum or polyethylene.
  • the flexible sheet 31 of the flexible bottom 3 comprises two layers of plastic 310a and 310c between which is interposed a metal sheet, an aluminum sheet 310b in this example.
  • Such a combination of materials allows optimal resistance while guaranteeing a high flexibility of the flexible base 3, that is to say that the flexible sheet is capable of stretching without breaking.
  • the plastic layer 310c located between the aluminum foil 310b and the flat parts 22, 23 ensures optimal sealing of the flexible bottoms 3 on the metal body 2 of the box.
  • Such a flexible bottom 3 also has a small thickness and a reduced weight.
  • the flexible bottom 3 has a mass less than 10g, and more precisely less than 5g.
  • the mass of the flexible bottom 3 is equal to 3 g.
  • the flexible bottoms 3 are capable of deforming in a reversible manner, so as to vary the interior volume of the box, thereby allowing pressure variations to be absorbed.
  • the flexible bottoms 3 allow the box 1 to inflate and retract during pressure variations occurring during the heat treatment.
  • the metal body 2 being less stressed during the heat treatment, its thickness, and therefore its mass, are reduced compared to a conventional can body.
  • a classic metal body has a mass of around 51g.
  • the use of two flexible bottoms according to the invention allows the use of a metallic body 2 of reduced thickness and having a mass of less than 50 g.
  • the mass of the metal body 2 is less than 40g.
  • a can 1 in accordance with the invention using two flexible bottoms of 3 g each and a conventional can body (50 g) has a total mass of maximum 56 g.
  • the boxes of the prior art which have a conventional body of 51g, a conventional rigid bottom of 16g and a peelable bottom of 10g have a mass of 77g, which is much higher.
  • the gain in mass of the can 1 of the invention is therefore at least 15g.
  • One of the flexible sheets 31 of the can 1 has a precut 313 which is intended to weaken the flexible bottom 3 and allow easy opening of the can 1.
  • the precut 313 of the flexible bottom 3 is implemented in a conventional manner, preferably by a laser cutting technique.
  • This precut 313 is indicated to the user by means of an ink trace, for example in dotted lines.
  • the opening of the can 1 of the invention does not require any particular tool and does not require significant effort on the part of the user.
  • This approach allows for easy opening (opening requires little effort and no special tools) and guarantees optimal sealing of the can 1.
  • the tin can of the invention is obtained by a different manufacturing process compared to that of tin cans of the prior art.
  • the structure of the can according to the invention offers optimal resistance to the pressures undergone during the sterilization of the food content.
  • the can according to the invention has an easy opening for the user and guarantees a perfect seal.
  • Such a box is also light, robust, simple and inexpensive to manufacture.
  • the precut can have other shapes than a circular shape.
  • the figure 8 has a can 1 having a can body 2 in the form of a truncated cone, the diameter of the lower flexible bottom (not visible) being less than that of the upper flexible bottom 3.
  • This particular shape makes it possible to stack the conical cans one on top of the other in a stable manner, but also one inside the other, in a compact manner, once the cans are empty.
  • the boxes can be stacked one inside the other before filling the can and / or after consumption of the contents of the can.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Packages (AREA)
  • Bakery Products And Manufacturing Methods Therefor (AREA)
  • Table Devices Or Equipment (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
EP19186177.2A 2015-03-04 2016-03-04 Konservendose mit flexiblem boden und entsprechendes herstellungsverfahren Active EP3604155B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR1551795 2015-03-04
FR1557949A FR3040377B1 (fr) 2015-08-26 2015-08-26 Boite de conserve a fond souple, fond souple de boite et procede de fabrication correspondant
EP16709315.2A EP3265389B1 (de) 2015-03-04 2016-03-04 Behälter für konservierte nahrungsmittel mit flexiblem boden und zugehöriges herstellungsverfahren
PCT/EP2016/054649 WO2016139341A1 (fr) 2015-03-04 2016-03-04 Boite de conserve a fond souple et procédé de fabrication correspondant

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP16709315.2A Division EP3265389B1 (de) 2015-03-04 2016-03-04 Behälter für konservierte nahrungsmittel mit flexiblem boden und zugehöriges herstellungsverfahren
EPPCT/EP2016/709315 Previously-Filed-Application 2016-03-04

Publications (2)

Publication Number Publication Date
EP3604155A1 true EP3604155A1 (de) 2020-02-05
EP3604155B1 EP3604155B1 (de) 2024-05-01

Family

ID=55524298

Family Applications (2)

Application Number Title Priority Date Filing Date
EP16709315.2A Active EP3265389B1 (de) 2015-03-04 2016-03-04 Behälter für konservierte nahrungsmittel mit flexiblem boden und zugehöriges herstellungsverfahren
EP19186177.2A Active EP3604155B1 (de) 2015-03-04 2016-03-04 Konservendose mit flexiblem boden und entsprechendes herstellungsverfahren

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP16709315.2A Active EP3265389B1 (de) 2015-03-04 2016-03-04 Behälter für konservierte nahrungsmittel mit flexiblem boden und zugehöriges herstellungsverfahren

Country Status (15)

Country Link
US (1) US10583958B2 (de)
EP (2) EP3265389B1 (de)
CA (1) CA2978371A1 (de)
CY (1) CY1122767T1 (de)
DK (1) DK3265389T3 (de)
ES (1) ES2746829T3 (de)
HR (1) HRP20191801T1 (de)
HU (1) HUE045436T2 (de)
LT (1) LT3265389T (de)
PL (1) PL3265389T3 (de)
PT (1) PT3265389T (de)
RS (1) RS59228B1 (de)
SI (1) SI3265389T1 (de)
SM (1) SMT201900543T1 (de)
WO (1) WO2016139341A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3101861B1 (fr) * 2019-10-14 2021-11-12 Groupe Daucy Méthode de fabrication d’une boîte de conserve

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US3079031A (en) * 1960-02-23 1963-02-26 Continental Can Co Metal band double seamed to metal can for attaching elastic transparent end thereto
US3964670A (en) * 1974-12-09 1976-06-22 The Procter & Gamble Company Closure
FR2662422A1 (fr) * 1990-05-23 1991-11-29 Zuechner Blechwaren Emballage metallique a rebord profile scellable.
EP2019045A1 (de) * 2007-07-23 2009-01-28 Alcan Technology & Management Ltd. Dosendeckel mit Deckelring und peelbarer Verschlussmembran
FR2942460A1 (fr) * 2009-02-26 2010-08-27 Impress Group Bv Boite metallique en trois pieces
FR2955844A1 (fr) 2010-02-03 2011-08-05 Saint Gobain Emballage Procede d'ouverture facile d'un opercule thermoscelle sur le buvant d'un recipient en verre
WO2012072383A1 (en) 2010-11-29 2012-06-07 Crown Packaging Technology, Inc. Closure
WO2013010875A1 (en) * 2011-07-21 2013-01-24 Crown Packaging Technology, Inc. Metal cans with peelable lids

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US2406900A (en) 1944-06-30 1946-09-03 Continental Can Co Adhesive tape container with nesting feature
US3434651A (en) * 1967-05-12 1969-03-25 Continental Can Co Mesh reinforced closure for full opening can
FR2604976B1 (fr) 1986-10-08 1989-06-23 Carnaud Emballage Sa Emballage metallique, notamment pour produit en poudre et procede de fabrication d'un tel emballage
US4940158A (en) * 1987-09-22 1990-07-10 American National Can Company Container and seam ring for container
FR2639561B1 (fr) 1988-11-29 1994-05-20 Carnaud Sa Procede de fabrication d'un emballage metallique a opercule souple et emballage metallique correspondant
FR2657587B1 (fr) 1990-01-26 1992-04-30 Cmb Packaging Sa Emballage metallique a opercule thermoscelle et procede de fabrication d'un tel emballage.
US5353943A (en) 1993-03-15 1994-10-11 Sonoco Products Company Easy-opening composite closure for hermetic sealing of a packaging container by double seaming
US5770290A (en) * 1993-12-01 1998-06-23 Mchenry; Robert J. Easy open end of a metal-plastic construction
CN1407940A (zh) * 1999-12-10 2003-04-02 汉高两合股份公司 热熔粘合剂包装容器
FR2813502B1 (fr) 2000-09-07 2004-04-23 Domaine Des Genets Procede et installation pour ouvrir des oeufs
FR2817502B1 (fr) 2000-12-06 2003-02-28 Pechiney Emballage Flexible Eu Materiau d'operculage pelable et refermable
FR2831483B1 (fr) 2001-10-26 2004-01-09 Pechiney Emballage Flexible Eu Materiaux d'operculage ou opercules pelables multicouches
FR2851232B1 (fr) 2003-02-17 2005-04-01 Pechiney Emballage Flexible Eu Materiau d'operculage et opercules predecoupes a base de polyolefine
ATE480465T1 (de) 2006-07-13 2010-09-15 Impress Metal Packaging Sa Behälterdeckel mit einer abziehbaren membrane
DE102009007860A1 (de) * 2008-11-07 2010-05-12 Huhtamaki Ronsberg, Zweigniederlassung Der Huhtamaki Deutschland Gmbh & Co. Kg Behälter
US20120043324A1 (en) 2010-08-18 2012-02-23 Silgan Containers Llc Container with Reduced, Peel-Off-Force Tear Configuration

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3079031A (en) * 1960-02-23 1963-02-26 Continental Can Co Metal band double seamed to metal can for attaching elastic transparent end thereto
US3964670A (en) * 1974-12-09 1976-06-22 The Procter & Gamble Company Closure
FR2662422A1 (fr) * 1990-05-23 1991-11-29 Zuechner Blechwaren Emballage metallique a rebord profile scellable.
EP2019045A1 (de) * 2007-07-23 2009-01-28 Alcan Technology & Management Ltd. Dosendeckel mit Deckelring und peelbarer Verschlussmembran
FR2942460A1 (fr) * 2009-02-26 2010-08-27 Impress Group Bv Boite metallique en trois pieces
FR2955844A1 (fr) 2010-02-03 2011-08-05 Saint Gobain Emballage Procede d'ouverture facile d'un opercule thermoscelle sur le buvant d'un recipient en verre
WO2012072383A1 (en) 2010-11-29 2012-06-07 Crown Packaging Technology, Inc. Closure
WO2013010875A1 (en) * 2011-07-21 2013-01-24 Crown Packaging Technology, Inc. Metal cans with peelable lids

Also Published As

Publication number Publication date
DK3265389T3 (da) 2019-10-14
SI3265389T1 (sl) 2019-11-29
HUE045436T2 (hu) 2019-12-30
WO2016139341A1 (fr) 2016-09-09
HRP20191801T1 (hr) 2020-02-21
LT3265389T (lt) 2019-10-25
SMT201900543T1 (it) 2019-11-13
PL3265389T3 (pl) 2020-01-31
PT3265389T (pt) 2019-08-06
EP3265389B1 (de) 2019-07-17
RS59228B1 (sr) 2019-10-31
US10583958B2 (en) 2020-03-10
EP3604155B1 (de) 2024-05-01
CA2978371A1 (fr) 2016-09-09
EP3265389A1 (de) 2018-01-10
ES2746829T3 (es) 2020-03-09
CY1122767T1 (el) 2021-05-05
US20180072456A1 (en) 2018-03-15

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