EP2512937A1 - Can-shaped container having a protective inner layer - Google Patents

Can-shaped container having a protective inner layer

Info

Publication number
EP2512937A1
EP2512937A1 EP10807603A EP10807603A EP2512937A1 EP 2512937 A1 EP2512937 A1 EP 2512937A1 EP 10807603 A EP10807603 A EP 10807603A EP 10807603 A EP10807603 A EP 10807603A EP 2512937 A1 EP2512937 A1 EP 2512937A1
Authority
EP
European Patent Office
Prior art keywords
protective layer
pores
tin
container
protective
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
EP10807603A
Other languages
German (de)
French (fr)
Other versions
EP2512937B1 (en
Inventor
Alain Le Talludec
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.)
Trivium Packaging Group Netherlands BV
Original Assignee
Ardagh MP Group Netherlands BV
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 Ardagh MP Group Netherlands BV filed Critical Ardagh MP Group Netherlands BV
Priority to EP16151810.5A priority Critical patent/EP3025977B1/en
Publication of EP2512937A1 publication Critical patent/EP2512937A1/en
Application granted granted Critical
Publication of EP2512937B1 publication Critical patent/EP2512937B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/14—Linings or internal coatings
    • 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
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
    • B65D1/26—Thin-walled containers, e.g. formed by deep-drawing operations
    • B65D1/28—Thin-walled containers, e.g. formed by deep-drawing operations formed of laminated material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D

Definitions

  • the present invention relates to a container of the kind can, for receiving a product to be packaged, the inner surface is at least partially made of tin coated with a protective layer.
  • Certain foodstuffs such as fruit or products containing tomato, are advantageously packaged in cans containing a can body whose inner surface is made at least partially of tin.
  • the product takes a certain amount of tin on the inner surface of the can body, which ensures the preservation of its organoleptic and visual properties by a limitation, or even a suppression, of oxidation phenomena.
  • Such partially partially coated cans are described, for example, in EP-0 492 870 or EP-0 688 615.
  • the box body comprising a bottom element which is extended by a side wall whose upper edge delimits an upper opening intended to receive a shutter element, is made from a shaped tin plate by a stamping operation.
  • the body of this can consists of a single, varnished cylindrical surface that extends continuously and uniformly over a portion of the height of the inner surface of its side wall from its top edge.
  • the remaining cylindrical portion of the height of this side wall (here on the side of its bottom element) constitutes an exposed area of the inner surface of tin (devoid of protective layer).
  • the aforementioned type of box, partially painted, is not completely satisfactory in that the inner surface of its side wall has a contrast with two different color zones, which are unsightly (the upper varnished , rather clear, and the other lower devoid of varnish, darker).
  • the Applicant has developed a new container of the type can, particularly suitable for packaging foodstuffs, whose inner surface of tin is coated with a protective layer which is adapted to limit or even eliminate the aesthetic impact of the chemical reaction of the product on the exposed tin, while allowing optimum arrangement of the tin to preserve the qualitative characteristics of the packaged foodstuff.
  • such a container can be used for the packaging of any product for which it would be interesting to take tin directly on the can body.
  • the container comprises a box body (for example in one or two pieces) delimiting an inner volume of packaging and having an inner surface consisting at least partially of tin which is coated with a layer protection intended to resist the chemical action of the product to be packaged.
  • This container is characterized in that this protective layer comprises, distributed over at least part of its surface, a plurality of pores (or otherwise called orifices or openings) through each of which an area facing the inner surface of tin is accessible from the inner volume of packaging.
  • This particular tin can thus divides the exposed tin inner surface (accessible through the pores) into a plurality or multiplicity of distinct areas; this allows the desired exposed tinned surface to be distributed over a larger portion of the inner packaging surface, and thus to limit the visual impact resulting from the chemical reaction between the tin and the packaged product.
  • the pores of the protective layer are distributed uniformly, or at least approximately uniformly, on the inner surface of tin; they may alternatively be grouped together on a part of the inner surface of tin, for example in the width of a strip located at the level of the side wall, preferably located at a distance from the upper edge and below the level surface products intended to be packaged in the can body so as to obtain an upper band of said side wall provided with a uniform protective layer and devoid of such pores;
  • the pores of the protective layer are formed randomly or non-randomly, at all or part of the protective layer;
  • the pores of the protective layer have a maximum dimension greater than 0.1 ⁇ , and preferably less than 5 mm;
  • the pores of the protective layer preferably have a surface area of between 100 ⁇ 2 and 9 mm 2 (and advantageously still 2 and 9 mm 2 ); the pores of the protective layer together represent an area of between 10% and 70%, and more preferably between 17% and 50%, with respect to the inner surface of the can body;
  • the protective layer consists of a protective varnish, chosen for example from polyester and epoxy acrylate, and advantageously comprising a thickness of between 2 and 80 ⁇ (and preferably between 4 and 30 ⁇ );
  • this protective layer consists of a protective film, integral with and conforming to the inner surface of the can body, which protective film has a resistance to elongation which is less than that of the metallic material constituting said body of box.
  • the invention also relates to a process for the manufacture of the container presented above, this process comprising, before the step of filling with the product to be packaged, a step for obtaining the protective layer comprising, distributed over at at least a portion of its surface, a plurality of pores through each of which an area facing the inner surface of tin is accessible from the container interior volume.
  • the protective layer consists of a protective varnish which is applied to the inner surface of tin so as to obtain the protective layer comprising the access pores to said tin-plated inner surface.
  • This layer of protective varnish is advantageously applied (i) to a metal part intended to be shaped to form at least a part of the box body and / or (ii) on a metal part already shaped.
  • the protective varnish applied advantageously consists of an emulsion or dispersion comprising (i) the protective varnish itself and (ii) a fluid dispersed in said varnish and which is capable of being removed after the application operation on the body of box so as to form the pores.
  • the fluid dispersed in the varnish consists for example of a liquid intended to be removed by natural or active evaporation.
  • the method comprises, before the filling step:
  • a protective film a laminated film or a layer of varnish for example
  • FIG. 1 is a general and schematic view of a container according to the invention, with a diametrical vertical cutting plane;
  • FIG. 2 is an enlarged view of detail II of Figure 1, so as to show schematically the structure of the protective layer coating the container body.
  • the container according to the invention as shown in Figures 1 and 2, here consists of a can, for the packaging of a foodstuff for example (not shown).
  • This container comprises a can body 1 composed of a bottom member 2 whose periphery is extended upwards by a side wall 3 (preferably in one or two rooms).
  • the side wall 3 is preferably devoid of moldings, or mostly devoid of such moldings.
  • the upper edge 4 of the side wall 2 delimits an upper opening 5 through which the foodstuff to be conditioned is brought.
  • This upper edge 4 is intended to receive a shutter member (not shown), which may be chosen by those skilled in the art (for example a peelable membrane or a metal disc with rupture initiation line).
  • This can body 1 defines an interior volume 6 for the packaging of the product of interest (for example a food product based on tomato or fruit).
  • the product of interest for example a food product based on tomato or fruit.
  • the bottom element 2 and the side wall 3 of the can body 1 can be made in one piece (for example by stamping).
  • These two parts 2, 3 can also be manufactured independently of one another and then secured together by any suitable operation (for example by crimping or welding).
  • the bottom element 2 and the side wall 3 of this box body 1 are advantageously made of a steel matrix.
  • At least a portion of the inner surface 7 of this box body 1 (oriented towards the inner volume side 6), and preferably at least the inner surface 3a of its side wall. 3, is constituted by coating of tin and / or a tin-based alloy.
  • the bottom element 2 may or may not be coated with such a layer of tin.
  • the inner surface of tin 7 is itself coated with an inner protective layer 10 which is made of a product resistant to the chemical action of the product to be packaged.
  • the protective layer 10 of the tinned surface 7 comprises, distributed over at least a portion of its surface, a plurality of pores January 1 through each of which a facing zone 7a of the inner surface of tin 7 is accessible from the interior volume of container 6.
  • the bottom element 2 is itself coated here with a continuous protective layer; alternatively, this element 2 may be (i) devoid of protection, (ii) partially protected or (iii) provided with a protective layer 10 also provided with pores January 1 (in particular if the bottom element 2 comprises also an inner surface of tin 7).
  • This multi-porous protection layer 10, 1 1 makes it possible to bring areas 7a of the inner surface of underlying tin 7 into contact with the packaged product, so as to deliver a certain quantity of tin within this product. by oxidation-reduction chemical reaction.
  • This particular distribution of exposed tin zones 7a has the advantage of limiting their aesthetic impact (blackening, darkening due to oxidation by the foodstuff), but also possibly of ensuring a delivery of tin well distributed over the whole the height of the conditioned foodstuff (to allow at least approximately uniform distribution of the tin).
  • the pores 1 1 of the protective layer 10 are advantageously uniformly distributed, or at least approximately uniformly, over the entire inner surface of tin 7.
  • these pores 1 1 of the protective layer 10 can be distributed and / or grouped only on the side wall 3: over its entire height or only a part of the height of this side wall 3, for example in the width of one or more annular bands.
  • these pores 1 1 are then advantageously arranged at a distance from the upper edge 4 and below the surface level of the products packaged in this case. box body 1; thus obtaining an upper band of the side wall 3 provided with a uniform protective layer 10 and devoid of such pores January 1, which is useful in particular to avoid any negative visual appearance of the protective layer 10.
  • these pores 11 may be distributed and arranged randomly, or non-randomly (that is to say in a predetermined manner and predetermined to form, together, a particular pattern and / or regular) .
  • the pores 1 1 advantageously have a maximum dimension d greater than 0.1 ⁇ , and preferably less than 5 mm; these pores 1 1 preferably have a maximum dimension d of between 10 ⁇ and 2.5 mm.
  • the pores 1 1 each have a surface between 100 ⁇ 2 and 9 mm 2 .
  • dimension of a pore is preferably meant the largest dimension of this pore 11, as illustrated by the dimensional dimension d in FIG.
  • These pores January 1 may have a regular contour, or at least approximately regular, for example generally circular or oval shape as shown in Figure 2. Alternatively, this contour may also be irregular.
  • the pores 1 1 advantageously together represent an area of between 10% and 70% (preferably between 17% and 50%) of the inner surface of the box body 1, preferably of the inner surface of the side wall 3 and more preferably the inner surface of tin 7.
  • the protective layer 10 advantageously consists of a layer of varnish, the composition and thickness of which are chosen by those skilled in the art depending on the conditioned foodstuff.
  • This protective varnish is preferably chosen from polyester and epoxy acrylate. It can be applied in liquid or powder form.
  • Its thickness is advantageously between 2 ⁇ and 80 ⁇ , and more preferably between 4 ⁇ and 30 ⁇ .
  • the multi-porous protective varnish layer 10, 11 can be obtained by means of a process comprising, before the step of filling with the product to be packaged, a step of applying the protective varnish to the inner surface of the tin 7 so as to obtain directly said protective layer 10 provided with pores January 1.
  • the protective varnish applied consists for example of an emulsion or dispersion comprising (i) the protective varnish itself and (ii) a fluid (gas or liquid) dispersed in this varnish and which is suitable to be removed after the application operation on the can body 1 so as to form the pores January 1 (in practice, this dispersed fluid is preferably immiscible or poorly miscible with the protective varnish).
  • this liquid is intended to be removed by natural or active evaporation.
  • the liquid removed consists for example of water.
  • the protective varnish applied above the surface level is devoid of the dispersed fluid
  • the protective varnish applied below the surface level contains an appropriate quantity of this dispersed fluid.
  • the protective varnish may be applied by means of a spray nozzle, a brush, a sponge and / or a roller, these application means being suitably controlled so as to obtain the special protective layer as described above.
  • the protective layer 10 consists of a film integral with the inner surface of the can body 1 and matching the latter.
  • This protective film 10 is chosen with an elongation resistance which is lower than that of the metallic material constituting said box body 1.
  • This protective film 10 advantageously consists of a material of polyethylene terephthalate or polypropylene type.
  • This protective film 10 may also consist of a layer of varnish having a reduced thickness, for example of the order of 1 to 4 ⁇ , preferably 1 to 2 ⁇
  • the one-piece box body 1 of FIG. 1 can be obtained by implementing a method comprising the steps detailed below, before the step of filling the product.
  • a metal part is manufactured, the shaping of which will make it possible to constitute the box body 1.
  • This metal part is covered with the bonded laminated film 10 (or the relatively fine protective lacquer layer), intact or intact, which is intended to constitute the protective layer and which has a resistance to elongation lower than that of the constituent metallic material. of the metal part.
  • this assembly is shaped, for example by stamping, to form the box body 1.
  • This forming operation generates a partial and local tearing of the protective film 10, because of the elongation of the workpiece 1 under conditions that are greater than the resistance to elongation of the laminated film 10.
  • This operation of The drawing thus creates a set of pores, cracks or tears 1 1 acting as free passages to the underlying tin.
  • the side wall 3 is of generally cylindrical tubular shape; it could alternatively have any other configuration and desired section: it could have for example a radial section oval, rectangular or square, oblong, etc.
  • it may have on its height a set of ribs or grooves, dents, necking, etc.
  • the container according to the invention has an inner surface which is partially protected.
  • the free zones 7a of the inner surface of tin 7 are arranged so as to limit the visual impact of the chemical reaction with the packaged product.
  • the exposed tin areas 7a are distributed here over the height of the side wall 3, which allows a better distribution of tin in the packaged product.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Packages (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Buffer Packaging (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Packging For Living Organisms, Food Or Medicinal Products That Are Sensitive To Environmental Conditiond (AREA)
  • Tires In General (AREA)

Abstract

The present invention relates to a container such as a can for holding a product to be packaged, in particular a food item, said container including a can body (1) made up of a bottom element (2) which is extended by a side wall (3), said can body (1) defining an inner packaging space (6) and comprising an inner surface (7) made at least partially of tin, which is covered with a protective layer (10) intended for resisting the chemical activity of said product to be packaged. According to the invention, the protective layer (10) comprises, distributed over at least one portion of the surface thereof, a plurality of pores (11) through each one of which an area (7a) opposite said inner tin surface (7) can be accessed from said inner container space (6), in particular to allow the release of tin while minimising the aesthetic impact caused by the chemical activity of said product to be packaged on said inner tin surface (7).

Description

CONTENANT EN FORME DE BOITE DE CONSERVE AVEC COUCHE DE PROTECTION INTERIEURE  CONTAINER IN THE FORM OF CANISTER BOX WITH INTERNAL PROTECTION LAYER
La présente invention concerne un contenant du genre boîte de conserve, destiné à recevoir un produit à conditionner, dont la surface intérieure est constituée au moins partiellement d'étain revêtu d'une couche de protection.  The present invention relates to a container of the kind can, for receiving a product to be packaged, the inner surface is at least partially made of tin coated with a protective layer.
Certaines denrées alimentaires, telles que les fruits ou les produits contenant de la tomate, sont avantageusement conditionnées dans des boîtes de conserves comprenant un corps de boîte dont la surface intérieure est constituée au moins partiellement d'étain.  Certain foodstuffs, such as fruit or products containing tomato, are advantageously packaged in cans containing a can body whose inner surface is made at least partially of tin.
En effet, ainsi conditionné, le produit prélève une certaine quantité d'étain sur la surface intérieure du corps de boîte, ce qui assure la préservation de ses propriétés organoleptiques et visuelles par une limitation, voire une suppression, des phénomènes d'oxydation.  Indeed, thus conditioned, the product takes a certain amount of tin on the inner surface of the can body, which ensures the preservation of its organoleptic and visual properties by a limitation, or even a suppression, of oxidation phenomena.
Pour contrôler la quantité d'étain mise à disposition du produit conditionné, il est connu de revêtir partiellement la surface intérieure étamée du corps de boîte avec une couche de vernis de protection.  To control the amount of tin made available of the packaged product, it is known to partially coat the tinned inner surface of the can body with a layer of protective varnish.
De telles boîtes de conserves partiellement vernies intérieurement sont par exemple décrites dans les documents EP-0 492 870 ou EP-0 688 615.  Such partially partially coated cans are described, for example, in EP-0 492 870 or EP-0 688 615.
Dans ces documents, le corps de boîte, comprenant un élément de fond qui est prolongé par une paroi latérale dont la bordure supérieure délimite une ouverture supérieure destinée à recevoir un élément d'obturation, est réalisé à partir d'une plaque d'étain conformée par une opération d'emboutissage.  In these documents, the box body, comprising a bottom element which is extended by a side wall whose upper edge delimits an upper opening intended to receive a shutter element, is made from a shaped tin plate by a stamping operation.
Le corps de cette boîte de conserve comprend une unique surface cylindrique vernie, qui s'étend de manière continue et uniforme sur une partie de la hauteur de la surface intérieure de sa paroi latérale, à partir de sa bordure supérieure. La partie cylindrique restante de la hauteur de cette paroi latérale (ici du côté de son élément de fond) constitue une zone exposée de la surface intérieure d'étain (dépourvue de couche de protection).  The body of this can consists of a single, varnished cylindrical surface that extends continuously and uniformly over a portion of the height of the inner surface of its side wall from its top edge. The remaining cylindrical portion of the height of this side wall (here on the side of its bottom element) constitutes an exposed area of the inner surface of tin (devoid of protective layer).
Le prélèvement d'étain présente un intérêt certain pour le produit conditionné, mais le contact entre le produit et la surface étamée du corps de boîte entraîne une réaction de corrosion qui s'accompagne d'un léger phénomène d'assombrissement.  The removal of tin is of some interest for the packaged product, but the contact between the product and the tinned surface of the can body causes a corrosion reaction which is accompanied by a slight darkening phenomenon.
Ainsi, le type de boîte précité, partiellement vernie, n'est pas totalement satisfaisant en ce sens que la surface intérieure de sa paroi latérale présente un contraste avec deux zones de couleurs différentes, qui s'avèrent peu esthétiques (l'une supérieure vernie, assez claire, et l'autre inférieure dépourvue de vernis, plus sombre).  Thus, the aforementioned type of box, partially painted, is not completely satisfactory in that the inner surface of its side wall has a contrast with two different color zones, which are unsightly (the upper varnished , rather clear, and the other lower devoid of varnish, darker).
Au regard de cet inconvénient, la demanderesse a développé un nouveau contenant du genre boîte de conserve, particulièrement adapté pour le conditionnement de denrées alimentaires, dont la surface intérieure d'étain est revêtue d'une couche de protection qui est adaptée pour limiter, voire supprimer, l'impact esthétique de la réaction chimique du produit sur l'étain exposé, tout en permettant une mise à disposition optimale de l'étain pour préserver les caractéristiques qualitatives de la denrée alimentaire conditionnée. In view of this drawback, the Applicant has developed a new container of the type can, particularly suitable for packaging foodstuffs, whose inner surface of tin is coated with a protective layer which is adapted to limit or even eliminate the aesthetic impact of the chemical reaction of the product on the exposed tin, while allowing optimum arrangement of the tin to preserve the qualitative characteristics of the packaged foodstuff.
Plus généralement, un tel contenant peut être utilisé pour le conditionnement de tout produit pour lequel il serait intéressant de prélever de l'étain directement sur le corps de boîte.  More generally, such a container can be used for the packaging of any product for which it would be interesting to take tin directly on the can body.
Pour cela, le contenant, selon l'invention, comprend un corps de boîte (par exemple en une ou deux pièces) délimitant un volume intérieur de conditionnement et comportant une surface intérieure constituée au moins partiellement d'étain qui est revêtu d'une couche de protection destinée à résister à l'action chimique du produit à conditionner.  For this, the container, according to the invention, comprises a box body (for example in one or two pieces) delimiting an inner volume of packaging and having an inner surface consisting at least partially of tin which is coated with a layer protection intended to resist the chemical action of the product to be packaged.
Ce contenant est caractérisé par le fait que cette couche de protection comporte, répartis sur une partie au moins de sa surface, une pluralité de pores (ou autrement dits d'orifices ou d'ouvertures) au travers de chacun desquels une zone en regard de la surface intérieure d'étain est accessible depuis le volume intérieur de conditionnement.  This container is characterized in that this protective layer comprises, distributed over at least part of its surface, a plurality of pores (or otherwise called orifices or openings) through each of which an area facing the inner surface of tin is accessible from the inner volume of packaging.
Cette boîte de conserve particulière permet ainsi de diviser la surface intérieure d'étain exposée (accessible au travers des pores) en une pluralité ou multiplicité de zones distinctes ; cela autorise la répartition de la surface étamée exposée souhaitée sur une partie plus importante de la surface interne de conditionnement, et donc de limiter l'impact visuel résultant de la réaction chimique entre l'étain et le produit conditionné.  This particular tin can thus divides the exposed tin inner surface (accessible through the pores) into a plurality or multiplicity of distinct areas; this allows the desired exposed tinned surface to be distributed over a larger portion of the inner packaging surface, and thus to limit the visual impact resulting from the chemical reaction between the tin and the packaged product.
D'autres caractéristiques structurelles avantageuses, pouvant être prises indépendamment ou en combinaison, sont développées ci-dessous :  Other advantageous structural characteristics, which can be taken independently or in combination, are developed below:
- les pores de la couche de protection sont répartis uniformément, ou au moins approximativement uniformément, sur la surface intérieure d'étain ; ils peuvent de manière alternative être regroupés sur une partie de la surface intérieure d'étain, par exemple dans la largeur d'une bande située au niveau de la paroi latérale, située de préférence à distance de la bordure supérieure et en-dessous du niveau de surface des produits destinés à être conditionnés dans le corps de boîte de sorte à obtenir une bande supérieure de ladite paroi latérale munie d'une couche de protection uniforme et dépourvue de tels pores ;  the pores of the protective layer are distributed uniformly, or at least approximately uniformly, on the inner surface of tin; they may alternatively be grouped together on a part of the inner surface of tin, for example in the width of a strip located at the level of the side wall, preferably located at a distance from the upper edge and below the level surface products intended to be packaged in the can body so as to obtain an upper band of said side wall provided with a uniform protective layer and devoid of such pores;
- les pores de la couche de protection sont ménagés aléatoirement ou non- aléatoirement, au niveau de tout ou partie de la couche de protection ;  - The pores of the protective layer are formed randomly or non-randomly, at all or part of the protective layer;
- les pores de la couche de protection ont une dimension maximale supérieure à 0,1 μιτι, et de préférence inférieure à 5 mm ;  the pores of the protective layer have a maximum dimension greater than 0.1 μιτι, and preferably less than 5 mm;
- les pores de la couche de protection ont de préférence une surface comprise entre 100 μιτι2 et 9 mm2 (et par avantageusement encore de 2 et 9 mm2) ; - les pores de la couche de protection représentent ensemble une surface comprise entre 10 % et 70%, et de préférence encore entre 17 % et 50 %, par rapport à la surface intérieure du corps de boîte ; the pores of the protective layer preferably have a surface area of between 100 μιτι 2 and 9 mm 2 (and advantageously still 2 and 9 mm 2 ); the pores of the protective layer together represent an area of between 10% and 70%, and more preferably between 17% and 50%, with respect to the inner surface of the can body;
- la couche de protection consiste en un vernis de protection, choisi par exemple parmi le polyester et l'époxy-acrylate, et comportant avantageusement une épaisseur comprise entre 2 et 80 μιτι (et de préférence entre 4 et 30 μιτι) ;  the protective layer consists of a protective varnish, chosen for example from polyester and epoxy acrylate, and advantageously comprising a thickness of between 2 and 80 μιτι (and preferably between 4 and 30 μιτι);
- de manière alternative, cette couche de protection consiste en un film de protection, solidaire et épousant la surface intérieure du corps de boîte, lequel film de protection présente une résistance à l'allongement qui est inférieure à celle du matériau métallique constitutif dudit corps de boîte.  alternatively, this protective layer consists of a protective film, integral with and conforming to the inner surface of the can body, which protective film has a resistance to elongation which is less than that of the metallic material constituting said body of box.
L'invention porte encore sur un procédé pour la fabrication du contenant présenté ci-dessus, ce procédé comprenant, avant l'étape de remplissage avec le produit à conditionner, une étape pour l'obtention de la couche de protection comportant, répartis sur au moins une partie de sa surface, une pluralité de pores au travers de chacun desquels une zone en regard de la surface intérieure d'étain est accessible depuis le volume intérieur de contenant.  The invention also relates to a process for the manufacture of the container presented above, this process comprising, before the step of filling with the product to be packaged, a step for obtaining the protective layer comprising, distributed over at at least a portion of its surface, a plurality of pores through each of which an area facing the inner surface of tin is accessible from the container interior volume.
Selon un mode de réalisation particulier, la couche de protection consiste en un vernis de protection qui est appliqué sur la surface intérieure d'étain de sorte à obtenir la couche de protection comportant les pores d'accès à ladite surface intérieure étamée.  According to a particular embodiment, the protective layer consists of a protective varnish which is applied to the inner surface of tin so as to obtain the protective layer comprising the access pores to said tin-plated inner surface.
Cette couche de vernis de protection est avantageusement appliquée (i) sur une pièce métallique destinée à être mise en forme pour constituer au moins une partie du corps de boîte et/ou (ii) sur une pièce métallique déjà mise en forme.  This layer of protective varnish is advantageously applied (i) to a metal part intended to be shaped to form at least a part of the box body and / or (ii) on a metal part already shaped.
Le vernis de protection appliqué consiste avantageusement en une émulsion ou une dispersion comprenant (i) le vernis de protection proprement dit et (ii) un fluide dispersé dans ledit vernis et qui est apte à être éliminé après l'opération d'application sur le corps de boîte de manière à former les pores.  The protective varnish applied advantageously consists of an emulsion or dispersion comprising (i) the protective varnish itself and (ii) a fluid dispersed in said varnish and which is capable of being removed after the application operation on the body of box so as to form the pores.
Le fluide dispersé dans le vernis consiste par exemple en un liquide destiné à être éliminé par évaporation naturelle ou active.  The fluid dispersed in the varnish consists for example of a liquid intended to be removed by natural or active evaporation.
Selon un autre mode de réalisation, le procédé comprend, avant l'étape de remplissage :  According to another embodiment, the method comprises, before the filling step:
- une étape de fourniture d'au moins une pièce métallique destinée à être mise en forme pour constituer au moins une partie du corps de boîte de contenant, ladite pièce métallique étant recouverte d'un film de protection (un film laminé ou une couche de vernis par exemple) destiné à constituer la couche de protection et présentant une résistance à l'allongement qui est inférieure à celle du matériau métallique constitutif de ladite pièce métallique, et  a step of supplying at least one metal part intended to be shaped to constitute at least one part of the container box body, said metal part being covered with a protective film (a laminated film or a layer of varnish for example) intended to constitute the protective layer and having a resistance to elongation which is less than that of the metallic material constituting said metal part, and
- une étape de mise en forme de ladite pièce métallique pour constituer au moins une partie dudit corps de boîte de contenant, ladite opération de mise en forme générant un allongement de ladite pièce métallique qui forme les pores dans ledit film de protection par sa déchirure. a step of shaping said metal part to form at least a part of said container box body, said forming operation generating an elongation of said metal piece which forms the pores in said protective film by its tearing.
L'invention sera encore illustrée, sans être aucunement limitée, par la description suivante d'un mode de réalisation particulier, donné uniquement à titre d'exemple, illustré par les dessins annexés dans lesquels :  The invention will be further illustrated, without being limited in any way, by the following description of a particular embodiment, given solely by way of example, illustrated by the appended drawings in which:
- la figure 1 est une vue générale et schématique d'un contenant selon l'invention, avec un plan de coupe vertical diamétral ;  - Figure 1 is a general and schematic view of a container according to the invention, with a diametrical vertical cutting plane;
- la figure 2 est une vue agrandie du détail II de la figure 1 , de sorte à montrer schématiquement la structure de la couche de protection revêtant le corps de contenant.  - Figure 2 is an enlarged view of detail II of Figure 1, so as to show schematically the structure of the protective layer coating the container body.
Le contenant selon l'invention, tel que représenté sur les figures 1 et 2, consiste ici en une boîte de conserve, pour le conditionnement d'une denrée alimentaire par exemple (non représentée).  The container according to the invention, as shown in Figures 1 and 2, here consists of a can, for the packaging of a foodstuff for example (not shown).
Ce contenant comprend un corps de boîte 1 composé d'un élément de fond 2 dont la périphérie est prolongée vers le haut par une paroi latérale 3 (de préférence en une ou deux pièces).  This container comprises a can body 1 composed of a bottom member 2 whose periphery is extended upwards by a side wall 3 (preferably in one or two rooms).
La paroi latérale 3 est de préférence dépourvue de moulures, ou majoritairement dépourvue de telles moulures.  The side wall 3 is preferably devoid of moldings, or mostly devoid of such moldings.
La bordure supérieure 4 de la paroi latérale 2 délimite une ouverture supérieure 5 au travers de laquelle est rapportée la denrée alimentaire à conditionner. Cette bordure supérieure 4 est destinée à recevoir un élément d'obturation (non représenté), pouvant être choisi par l'homme du métier (par exemple une membrane pelable ou un disque métallique avec ligne d'amorce de rupture).  The upper edge 4 of the side wall 2 delimits an upper opening 5 through which the foodstuff to be conditioned is brought. This upper edge 4 is intended to receive a shutter member (not shown), which may be chosen by those skilled in the art (for example a peelable membrane or a metal disc with rupture initiation line).
Ce corps de boîte 1 délimite ainsi un volume intérieur 6 pour le conditionnement du produit d'intérêt (par exemple un produit alimentaire à base de tomate ou de fruits).  This can body 1 defines an interior volume 6 for the packaging of the product of interest (for example a food product based on tomato or fruit).
L'élément de fond 2 et la paroi latérale 3 du corps de boîte 1 peuvent être réalisés monobloc (par exemple par emboutissage).  The bottom element 2 and the side wall 3 of the can body 1 can be made in one piece (for example by stamping).
Ces deux parties 2, 3 peuvent également être fabriquées indépendamment l'une de l'autre, puis solidarisées ensemble par toute opération adaptée (par exemple par sertissage ou soudage).  These two parts 2, 3 can also be manufactured independently of one another and then secured together by any suitable operation (for example by crimping or welding).
L'élément de fond 2 et la paroi latérale 3 de ce corps de boîte 1 sont avantageusement réalisés dans une matrice d'acier.  The bottom element 2 and the side wall 3 of this box body 1 are advantageously made of a steel matrix.
De plus, tel qu'illustré par la figure 2, au moins une partie de la surface intérieure 7 de ce corps de boîte 1 (orientée du côté du volume intérieur 6), et de préférence au moins la surface intérieure 3a de sa paroi latérale 3, est constituée par revêtement d'étain et/ou d'un alliage à base d'étain.  In addition, as shown in FIG. 2, at least a portion of the inner surface 7 of this box body 1 (oriented towards the inner volume side 6), and preferably at least the inner surface 3a of its side wall. 3, is constituted by coating of tin and / or a tin-based alloy.
L'élément de fond 2 peut être ou non revêtu d'une telle couche d'étain. La surface intérieure d'étain 7 est elle-même revêtue d'une couche intérieure de protection 10 qui est réalisée dans un produit résistant à l'action chimique du produit à conditionner. The bottom element 2 may or may not be coated with such a layer of tin. The inner surface of tin 7 is itself coated with an inner protective layer 10 which is made of a product resistant to the chemical action of the product to be packaged.
La couche de protection 10 de la surface étamée 7 comporte, répartis sur au moins une partie de sa surface, une pluralité de pores 1 1 au travers de chacun desquels une zone en regard 7a de la surface intérieure d'étain 7 est accessible depuis le volume intérieur de contenant 6.  The protective layer 10 of the tinned surface 7 comprises, distributed over at least a portion of its surface, a plurality of pores January 1 through each of which a facing zone 7a of the inner surface of tin 7 is accessible from the interior volume of container 6.
L'élément de fond 2 est quant à lui revêtu ici d'une couche de protection 10 continue ; de manière alternative, cet élément 2 peut être (i) dépourvu de protection, (ii) partiellement protégé ou (iii) pourvu d'une couche de protection 10 également munie de pores 1 1 (en particulier si l'élément de fond 2 comporte aussi une surface intérieure d'étain 7).  The bottom element 2 is itself coated here with a continuous protective layer; alternatively, this element 2 may be (i) devoid of protection, (ii) partially protected or (iii) provided with a protective layer 10 also provided with pores January 1 (in particular if the bottom element 2 comprises also an inner surface of tin 7).
Cette couche de protection multi-pores 10, 1 1 permet la mise en contact de zones 7a de la surface intérieure d'étain sous-jacente 7 avec le produit conditionné, de sorte à délivrer une certaine quantité d'étain au sein de ce produit par réaction chimique de type oxydo-réduction.  This multi-porous protection layer 10, 1 1 makes it possible to bring areas 7a of the inner surface of underlying tin 7 into contact with the packaged product, so as to deliver a certain quantity of tin within this product. by oxidation-reduction chemical reaction.
Cette distribution particulière des zones d'étain exposées 7a a pour intérêt de limiter leur impact esthétique (noircissements, assombrissements dus à l'oxydation par la denrée alimentaire), mais aussi éventuellement d'assurer une délivrance d'étain bien répartie sur l'ensemble de la hauteur de la denrée alimentaire conditionnée (pour permettre une distribution au moins approximativement homogène de l'étain).  This particular distribution of exposed tin zones 7a has the advantage of limiting their aesthetic impact (blackening, darkening due to oxidation by the foodstuff), but also possibly of ensuring a delivery of tin well distributed over the whole the height of the conditioned foodstuff (to allow at least approximately uniform distribution of the tin).
A cet effet, les pores 1 1 de la couche de protection 10 sont avantageusement répartis uniformément, ou au moins approximativement uniformément, sur l'ensemble de la surface intérieure d'étain 7.  For this purpose, the pores 1 1 of the protective layer 10 are advantageously uniformly distributed, or at least approximately uniformly, over the entire inner surface of tin 7.
De manière alternative, ces pores 1 1 de la couche de protection 10 peuvent être répartis et/ou regroupés uniquement sur la paroi latérale 3 : sur toute sa hauteur ou sur une partie seulement de la hauteur de cette paroi latérale 3, par exemple dans la largeur d'une ou plusieurs bandes annulaires.  Alternatively, these pores 1 1 of the protective layer 10 can be distributed and / or grouped only on the side wall 3: over its entire height or only a part of the height of this side wall 3, for example in the width of one or more annular bands.
Dans le cas d'une paroi latérale 3 avec des pores 1 1 sur une partie seulement de sa hauteur, ces pores 1 1 sont alors avantageusement ménagés à distance de la bordure supérieure 4 et en-dessous du niveau de surface des produits conditionnés dans ce corps de boîte 1 ; on obtient ainsi une bande supérieure de la paroi latérale 3 munie d'une couche de protection 10 uniforme et dépourvue de tels pores 1 1 , ce qui est utile en particulier pour éviter tout aspect visuel négatif de la couche de protection 10.  In the case of a side wall 3 with pores 1 1 on only a part of its height, these pores 1 1 are then advantageously arranged at a distance from the upper edge 4 and below the surface level of the products packaged in this case. box body 1; thus obtaining an upper band of the side wall 3 provided with a uniform protective layer 10 and devoid of such pores January 1, which is useful in particular to avoid any negative visual appearance of the protective layer 10.
Dans toutes ces formes de réalisation, ces pores 1 1 peuvent être répartis et ménagés aléatoirement, ou non-aléatoirement (c'est-à-dire d'une manière déterminée et prédéfinie pour former, ensemble, un motif particulier et/ou régulier).  In all these embodiments, these pores 11 may be distributed and arranged randomly, or non-randomly (that is to say in a predetermined manner and predetermined to form, together, a particular pattern and / or regular) .
Toujours pour un compromis optimal entre l'esthétique et la libération recherchée d'étain, les pores 1 1 ont avantageusement une dimension maximale d supérieure à 0,1 μητι, et de préférence inférieure à 5 mm ; ces pores 1 1 ont de préférence une dimension maximale d comprise entre 10 μιτι et 2,5 mm. Still for an optimal compromise between aesthetics and the desired release of tin, the pores 1 1 advantageously have a maximum dimension d greater than 0.1 μητι, and preferably less than 5 mm; these pores 1 1 preferably have a maximum dimension d of between 10 μιτι and 2.5 mm.
Egalement de préférence, les pores 1 1 ont chacun une surface comprise entre 100 μηη2 et 9 mm2. Also preferably, the pores 1 1 each have a surface between 100 μηη 2 and 9 mm 2 .
Par « dimension » d'un pore, on entend de préférence la plus grande dimension de ce pore 1 1 , tel qu'illustré par la cotation dimensionnelle d sur la figure 2. By "dimension" of a pore is preferably meant the largest dimension of this pore 11, as illustrated by the dimensional dimension d in FIG.
Ces pores 1 1 peuvent présenter un contour régulier, ou au moins approximativement régulier, par exemple de forme générale circulaire ou ovale tel que représenté sur la figure 2. De manière alternative, ce contour peut également être irrégulier.  These pores January 1 may have a regular contour, or at least approximately regular, for example generally circular or oval shape as shown in Figure 2. Alternatively, this contour may also be irregular.
De plus, les pores 1 1 représentent ensemble avantageusement une surface comprise entre 10 % et 70 % (de préférence entre 17 % et 50 %) de la surface intérieure du corps de boîte 1 , de préférence de la surface intérieure de la paroi latérale 3 et de préférence encore de la surface intérieure d'étain 7.  In addition, the pores 1 1 advantageously together represent an area of between 10% and 70% (preferably between 17% and 50%) of the inner surface of the box body 1, preferably of the inner surface of the side wall 3 and more preferably the inner surface of tin 7.
Selon un mode de réalisation préféré, la couche de protection 10 consiste avantageusement en une couche de vernis, dont la composition et l'épaisseur notamment sont choisies par l'homme du métier en fonction de la denrée alimentaire conditionnée.  According to a preferred embodiment, the protective layer 10 advantageously consists of a layer of varnish, the composition and thickness of which are chosen by those skilled in the art depending on the conditioned foodstuff.
Ce vernis de protection est choisi de préférence parmi le polyester et l'époxy- acrylate. Il peut être appliqué sous forme liquide ou en poudre.  This protective varnish is preferably chosen from polyester and epoxy acrylate. It can be applied in liquid or powder form.
Son épaisseur est avantageusement comprise entre 2 μιτι et 80 μιτι, et de préférence encore entre 4 μιτι et 30 μιτι.  Its thickness is advantageously between 2 μιτι and 80 μιτι, and more preferably between 4 μιτι and 30 μιτι.
La couche de vernis de protection multi-pores 10, 1 1 peut être obtenue au moyen d'un procédé comprenant, avant l'étape de remplissage avec le produit à conditionner, une étape d'application du vernis de protection sur la surface intérieure d'étain 7 de sorte à obtenir directement ladite couche de protection 10 munie de pores 1 1 .  The multi-porous protective varnish layer 10, 11 can be obtained by means of a process comprising, before the step of filling with the product to be packaged, a step of applying the protective varnish to the inner surface of the tin 7 so as to obtain directly said protective layer 10 provided with pores January 1.
Selon un mode de réalisation possible, le vernis de protection appliqué consiste par exemple en une émulsion ou une dispersion comprenant (i) le vernis de protection proprement dit et (ii) un fluide (gaz ou liquide) dispersé dans ce vernis et qui est apte à être éliminé après l'opération d'application sur le corps de boîte 1 de manière à former les pores 1 1 (en pratique, ce fluide dispersé est avantageusement non miscible ou peu miscible avec le vernis de protection).  According to one possible embodiment, the protective varnish applied consists for example of an emulsion or dispersion comprising (i) the protective varnish itself and (ii) a fluid (gas or liquid) dispersed in this varnish and which is suitable to be removed after the application operation on the can body 1 so as to form the pores January 1 (in practice, this dispersed fluid is preferably immiscible or poorly miscible with the protective varnish).
Dans le cas d'un liquide émulsionné dans le vernis de protection, ce liquide est destiné à être éliminé par évaporation naturelle ou active. Le liquide éliminé consiste par exemple en de l'eau.  In the case of a liquid emulsified in the protective varnish, this liquid is intended to be removed by natural or active evaporation. The liquid removed consists for example of water.
Pour ajuster la libération d'étain sur la hauteur de la boîte, il peut être envisagé de faire varier le pourcentage de fluide dispersé dans le vernis de protection au cours de l'application. Par exemple, pour ménager les pores 1 1 à distance de la bordure supérieure 4 de la paroi latérale 3 et en-dessous du niveau de surface des produits destinés à être conditionnés dans le corps de boîte 1 , il peut être prévu que : To adjust the release of tin on the height of the box, it may be envisaged to vary the percentage of fluid dispersed in the protective varnish during the application. For example, to keep the pores 1 1 away from the upper edge 4 of the side wall 3 and below the surface level of the products intended to be packaged in the can body 1, it can be provided that:
- le vernis de protection appliqué au-dessus du niveau de surface soit dépourvu du fluide dispersé, et  the protective varnish applied above the surface level is devoid of the dispersed fluid, and
- le vernis de protection appliqué au-dessous du niveau de surface contient une quantité appropriée de ce fluide dispersé.  the protective varnish applied below the surface level contains an appropriate quantity of this dispersed fluid.
De manière générale, le vernis de protection peut être appliqué au moyen d'une buse de pulvérisation, d'un pinceau, d'une éponge et/ou d'un rouleau, ces moyens d'application étant convenablement pilotés de sorte à obtenir la couche de protection particulière telle que décrite ci-dessus.  In general, the protective varnish may be applied by means of a spray nozzle, a brush, a sponge and / or a roller, these application means being suitably controlled so as to obtain the special protective layer as described above.
Selon encore un autre mode de réalisation possible, la couche de protection 10 consiste en un film solidaire de la surface intérieure du corps de boîte 1 et épousant cette dernière.  According to yet another possible embodiment, the protective layer 10 consists of a film integral with the inner surface of the can body 1 and matching the latter.
Ce film de protection 10 est choisi avec une résistance à l'allongement qui est inférieure à celle du matériau métallique constitutif dudit corps de boîte 1 . This protective film 10 is chosen with an elongation resistance which is lower than that of the metallic material constituting said box body 1.
Ce film de protection 10 consiste avantageusement en un matériau de type polyéthylène téréphtalate ou polypropylène.  This protective film 10 advantageously consists of a material of polyethylene terephthalate or polypropylene type.
Ce film de protection 10 peut également consister en une couche de vernis comportant une épaisseur réduite, par exemple de l'ordre de 1 à 4 μιτι, de préférence de 1 à 2 μιτι This protective film 10 may also consist of a layer of varnish having a reduced thickness, for example of the order of 1 to 4 μιτι, preferably 1 to 2 μιτι
(ou tout autre type de revêtement adapté), déchirée lors du formage de manière à générer les pores recherchés. (or any other type of suitable coating), torn during forming so as to generate the desired pores.
Dans ce cas, le corps de boîte monobloc 1 de la figure 1 peut être obtenu par la mise en œuvre d'un procédé comprenant les étapes détaillées ci-dessous, avant l'étape de remplissage du produit.  In this case, the one-piece box body 1 of FIG. 1 can be obtained by implementing a method comprising the steps detailed below, before the step of filling the product.
Tout d'abord, on fabriqué une pièce métallique dont la mise en forme va permettre de constituer le corps de boîte 1 . Cette pièce métallique est recouverte du film laminé collé 10 (ou la couche de vernis de protection relativement fine), intact ou intègre, qui est destiné constituer la couche de protection et qui présente une résistance à l'allongement inférieure à celle du matériau métallique constitutif de la pièce métallique.  Firstly, a metal part is manufactured, the shaping of which will make it possible to constitute the box body 1. This metal part is covered with the bonded laminated film 10 (or the relatively fine protective lacquer layer), intact or intact, which is intended to constitute the protective layer and which has a resistance to elongation lower than that of the constituent metallic material. of the metal part.
Ensuite, cet ensemble est mis en forme, par exemple par emboutissage, pour constituer le corps de boîte 1 .  Then, this assembly is shaped, for example by stamping, to form the box body 1.
Cette opération de mise en forme génère une déchirure partielle et locale du film de protection 10, cela du fait de l'allongement de la pièce 1 dans des conditions qui sont supérieures à la résistance à l'allongement du film laminé 10. Cette opération d'étirage crée ainsi un ensemble de pores, criques ou déchirures 1 1 faisant office de passages libres à l'étain sous-jacent. Une fois le corps de boîte obtenu, avec sa couche de protection multi-pores 10, 1 1 constituée, le contenant peut être rempli avec le produit à conditionner, et l'ouverture de remplissage 5 peut ensuite être obturée avec un second élément de fond rapporté. This forming operation generates a partial and local tearing of the protective film 10, because of the elongation of the workpiece 1 under conditions that are greater than the resistance to elongation of the laminated film 10. This operation of The drawing thus creates a set of pores, cracks or tears 1 1 acting as free passages to the underlying tin. Once the box body has been obtained, with its multi-porous protection layer 10, 11 constituted, the container can be filled with the product to be packaged, and the filling opening 5 can then be closed with a second bottom element. reported.
Tel qu'illustré sur les figures 1 et 2, la paroi latérale 3 est de forme générale tubulaire cylindrique ; elle pourrait de manière alternative présenter toute autre configuration et section souhaitée : elle pourrait présenter par exemple une section radiale ovale, rectangulaire ou carrée, oblongue, etc.  As illustrated in Figures 1 and 2, the side wall 3 is of generally cylindrical tubular shape; it could alternatively have any other configuration and desired section: it could have for example a radial section oval, rectangular or square, oblong, etc.
De même, elle peut comporter sur sa hauteur un ensemble de nervures ou rainures, bosselages, rétreints, etc.  Similarly, it may have on its height a set of ribs or grooves, dents, necking, etc.
Le contenant selon l'invention présente une surface intérieure qui est partiellement protégée. Les zones libres 7a de la surface intérieure d'étain 7 sont agencées de manière à limiter l'impact visuel de la réaction chimique avec le produit conditionné. De plus, les zones d'étain exposées 7a sont distribuées ici sur la hauteur de la paroi latérale 3, ce qui permet une meilleure distribution de l'étain dans le produit conditionné.  The container according to the invention has an inner surface which is partially protected. The free zones 7a of the inner surface of tin 7 are arranged so as to limit the visual impact of the chemical reaction with the packaged product. In addition, the exposed tin areas 7a are distributed here over the height of the side wall 3, which allows a better distribution of tin in the packaged product.

Claims

- REVENDICATIONS - - CLAIMS -
1 . - Contenant du genre boîte de conserve destiné à recevoir un produit à conditionner, en particulier une denrée alimentaire, lequel contenant comprend un corps de boîte (1 ) composé d'un élément de fond (2) qui est prolongé par une paroi latérale (3) dont la bordure supérieure (4) délimite une ouverture supérieure (5) destinée à recevoir un élément d'obturation, lequel corps de boîte (1 ) délimite un volume intérieur de conditionnement (6) et comporte une surface intérieure (7) constituée au moins partiellement d'étain, qui est revêtue d'une couche de protection (10) destinée à résister à l'action chimique dudit produit à conditionner, caractérisé en ce que ladite couche de protection (10) comporte, répartis sur au moins une partie de sa surface, une pluralité de pores (1 1 ) au travers de chacun desquels une zone en regard (7a) de ladite surface intérieure d'étain (7) est accessible depuis ledit volume intérieur de contenant (6). 1. - Container-type container for receiving a product to be packaged, in particular a foodstuff, which container comprises a can body (1) composed of a bottom element (2) which is extended by a side wall (3) ) whose upper edge (4) delimits an upper opening (5) for receiving a closure element, which box body (1) delimits an interior conditioning volume (6) and has an inner surface (7) formed at at least partially of tin, which is coated with a protective layer (10) intended to withstand the chemical action of said product to be conditioned, characterized in that said protective layer (10) comprises, distributed over at least a part from its surface, a plurality of pores (1 1) through each of which a facing zone (7a) of said inner tin surface (7) is accessible from said inner container volume (6).
2. - Contenant selon la revendication 1 , caractérisé en ce que les pores (1 1 ) de la couche de protection (10) sont répartis uniformément, ou au moins approximativement uniformément, sur la surface intérieure d'étain (7).  2. - Container according to claim 1, characterized in that the pores (1 1) of the protective layer (10) are distributed uniformly, or at least approximately uniformly, on the inner surface of tin (7).
3. - Contenant selon la revendication 1 , caractérisé en ce que les pores (1 1 ) de la couche de protection (10) sont regroupés sur une partie de la surface intérieure d'étain (7).  3. - Container according to claim 1, characterized in that the pores (1 1) of the protective layer (10) are grouped on a portion of the inner surface of tin (7).
4. - Contenant selon la revendication 3, caractérisé en ce que les pores (1 1 ) sont ménagés à distance de la bordure supérieure (4) de la paroi latérale (3) et en-dessous du niveau de surface des produits destinés à être conditionnés dans le corps de boîte (1 ), de sorte à obtenir une bande supérieure de ladite paroi latérale (3) munie d'une couche de protection (10) uniforme et dépourvue de tels pores (1 1 ).  4. - Container according to claim 3, characterized in that the pores (1 1) are arranged at a distance from the upper edge (4) of the side wall (3) and below the surface level of products intended to be packaged in the box body (1), so as to obtain an upper band of said side wall (3) provided with a protective layer (10) uniform and devoid of such pores (1 1).
5. - Contenant selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les pores (1 1 ) de la couche de protection (10) sont ménagés aléatoirement ou non- aléatoirement.  5. - Container according to any one of claims 1 to 4, characterized in that the pores (1 1) of the protective layer (10) are formed randomly or non-randomly.
6. - Contenant selon l'une quelconque des revendications 1 à 5, caractérisé en ce que les pores (1 1 ) de la couche de protection (10) ont une dimension maximale (d) supérieure à 0,1 μιτι.  6. - Container according to any one of claims 1 to 5, characterized in that the pores (1 1) of the protective layer (10) have a maximum dimension (d) greater than 0.1 μιτι.
7. - Contenant selon l'une quelconque des revendications 1 à 6, caractérisé en ce que les pores (1 1 ) de la couche de protection (10) ont chacun une surface comprise entre 100 μιτι2 et 9 mm2. 7. - Container according to any one of claims 1 to 6, characterized in that the pores (1 1) of the protective layer (10) each have a surface between 100 μιτι 2 and 9 mm 2 .
8. - Contenant selon l'une quelconque des revendications 1 à 7, caractérisé en ce que les pores (1 1 ) de la couche de protection (10) représentent ensemble une surface comprise entre 10 % et 70% par rapport à la surface intérieure du corps de boîte (1 ).  8. - Container according to any one of claims 1 to 7, characterized in that the pores (1 1) of the protective layer (10) together represent an area between 10% and 70% relative to the inner surface of the box body (1).
9. - Contenant selon l'une quelconque des revendications 1 à 8, caractérisé en ce que la couche de protection (10) consiste en un vernis de protection.  9. - Container according to any one of claims 1 to 8, characterized in that the protective layer (10) consists of a protective varnish.
10. - Contenant selon l'une quelconque des revendications 1 à 8, caractérisé en ce que la couche de protection (10) consiste en un film de protection, solidaire et épousant la surface intérieure du corps de boîte (1 ), lequel film de protection (10) présente une résistance à l'allongement qui est inférieure à celle du matériau métallique constitutif dudit corps de boîte (1 ). 10. - Container according to any one of claims 1 to 8, characterized in that the protective layer (10) consists of a protective film, integral and conforming to the inner surface of the can body (1), which protective film (10) has an elongation resistance which is less than that of the metallic material constituting said can body (1).
1 1 . - Procédé de fabrication d'un contenant selon l'une quelconque des revendications 1 à 10, lequel contenant comprend un corps de boîte (1 ) composé d'un élément de fond (2) qui est prolongé par une paroi latérale (3) dont la bordure supérieure (4) délimite une ouverture supérieure (5) destinée à recevoir un élément d'obturation, lequel corps de boîte (1 ) délimite un volume intérieur de conditionnement (6) et comporte une surface intérieure (7) constituée au moins partiellement d'étain qui est revêtue d'une couche de protection (10) destinée à résister à l'action chimique dudit produit à conditionner, caractérisé en ce que ledit procédé comprend, avant l'étape de remplissage avec le produit à conditionner, une étape pour l'obtention de ladite couche de protection (10) comportant, répartis sur au moins une partie de sa surface, une pluralité de pores (1 1 ) au travers de chacun desquels une zone en regard (7a) de ladite surface intérieure d'étain (7) est accessible depuis ledit volume intérieur de contenant (6).  1 1. - A method of manufacturing a container according to any one of claims 1 to 10, which container comprises a box body (1) composed of a bottom member (2) which is extended by a side wall (3) of which the upper edge (4) delimits an upper opening (5) for receiving a closure element, which box body (1) delimits an interior conditioning volume (6) and has an inner surface (7) formed at least partially of tin which is coated with a protective layer (10) intended to resist the chemical action of said product to be conditioned, characterized in that said method comprises, before the step of filling with the product to be packaged, a step for obtaining said protective layer (10) having, distributed over at least a portion of its surface, a plurality of pores (1 1) through each of which an area facing (7a) of said inner surface of tin (7 ) is accessible from said container interior volume (6).
12. - Procédé de fabrication selon la revendication 1 1 , caractérisé en ce que la couche de protection (10) consiste en un vernis de protection, qui est appliqué sur la surface intérieure d'étain (7) de sorte à obtenir, avant remplissage, ladite couche de protection (10) comportant les pores (1 1 ) d'accès à ladite surface intérieure d'étain (7).  12. - manufacturing method according to claim 1 1, characterized in that the protective layer (10) consists of a protective varnish, which is applied to the inner surface of tin (7) so as to obtain, before filling said protective layer (10) having the pores (1 1) for access to said inner surface of tin (7).
13. - Procédé de fabrication selon la revendication 12, caractérisé en ce que le vernis de protection appliqué consiste en une émulsion ou une dispersion comprenant (i) le vernis de protection proprement dit et (ii) un fluide dispersé dans ledit vernis et qui est apte à être éliminé après l'opération d'application sur le corps de boîte (1 ) de manière à former les pores (1 1 ).  13. - The manufacturing method according to claim 12, characterized in that the protective varnish applied consists of an emulsion or dispersion comprising (i) the protective varnish itself and (ii) a fluid dispersed in said varnish and which is adapted to be removed after the application operation on the can body (1) so as to form the pores (1 1).
14. - Procédé de fabrication selon la revendication 13, caractérisé en ce que le fluide dispersé dans le vernis consiste en un liquide destiné à être éliminé par évaporation naturelle ou active.  14. - The manufacturing method according to claim 13, characterized in that the fluid dispersed in the varnish consists of a liquid to be removed by natural or active evaporation.
15. - Procédé selon la revendication 1 1 , caractérisé qu'il comprend, avant l'étape de remplissage, les étapes suivantes :  15. - Method according to claim 1 1, characterized it comprises, before the filling step, the following steps:
- la fourniture d'au moins une pièce métallique destinée à être mise en forme pour constituer au moins une partie du corps de boîte de contenant (1 ), ladite pièce métallique étant recouverte d'un film de protection, destiné à constituer la couche de protection (10) et présentant une résistance à l'allongement qui est inférieure à celle du matériau métallique constitutif de ladite pièce métallique, puis  - The provision of at least one metal part to be shaped to form at least a portion of the container box body (1), said metal part being covered with a protective film, intended to form the layer of protection (10) and having a resistance to elongation which is less than that of the metallic material constituting said metal part, then
- la mise en forme de ladite pièce métallique (1 ) pour constituer au moins une partie dudit corps de boîte de contenant (1 ), ladite opération de mise en forme générant un allongement de ladite pièce métallique (1 ) qui provoque la formation de pores (1 1 ) dans ledit film de protection (10) par sa déchirure.  - shaping said metal piece (1) to form at least a portion of said container box body (1), said shaping operation generating an elongation of said metal piece (1) which causes pore formation (1 1) in said protective film (10) by tearing.
EP10807603.5A 2009-12-17 2010-12-16 Can-shaped container having a protective inner layer Not-in-force EP2512937B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16151810.5A EP3025977B1 (en) 2009-12-17 2010-12-16 Method for producing a container in the form of a can with an inner protection layer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0906114A FR2954291B1 (en) 2009-12-17 2009-12-17 CONTAINER IN THE FORM OF CANISTER BOX WITH INTERNAL PROTECTION LAYER
PCT/FR2010/052769 WO2011073583A1 (en) 2009-12-17 2010-12-16 Can-shaped container having a protective inner layer

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP16151810.5A Division EP3025977B1 (en) 2009-12-17 2010-12-16 Method for producing a container in the form of a can with an inner protection layer
EP16151810.5A Division-Into EP3025977B1 (en) 2009-12-17 2010-12-16 Method for producing a container in the form of a can with an inner protection layer

Publications (2)

Publication Number Publication Date
EP2512937A1 true EP2512937A1 (en) 2012-10-24
EP2512937B1 EP2512937B1 (en) 2016-03-30

Family

ID=42134285

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10807603.5A Not-in-force EP2512937B1 (en) 2009-12-17 2010-12-16 Can-shaped container having a protective inner layer
EP16151810.5A Not-in-force EP3025977B1 (en) 2009-12-17 2010-12-16 Method for producing a container in the form of a can with an inner protection layer

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP16151810.5A Not-in-force EP3025977B1 (en) 2009-12-17 2010-12-16 Method for producing a container in the form of a can with an inner protection layer

Country Status (17)

Country Link
US (1) US9511902B2 (en)
EP (2) EP2512937B1 (en)
JP (1) JP5716039B2 (en)
KR (2) KR101837125B1 (en)
CN (2) CN102725198B (en)
AU (1) AU2010332628A1 (en)
BR (1) BR112012014195A2 (en)
CA (1) CA2784798C (en)
DK (1) DK2512937T3 (en)
ES (2) ES2641550T3 (en)
FR (1) FR2954291B1 (en)
HU (2) HUE034520T2 (en)
MA (1) MA33749B1 (en)
PL (2) PL2512937T3 (en)
RU (1) RU2555947C2 (en)
WO (1) WO2011073583A1 (en)
ZA (1) ZA201203384B (en)

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GB201211077D0 (en) * 2012-06-22 2012-08-01 Crown Packaging Technology Inc Two-piece can
USD817632S1 (en) * 2015-10-02 2018-05-15 Hydrapak, Inc. Flask

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Also Published As

Publication number Publication date
KR20120107474A (en) 2012-10-02
ES2578083T3 (en) 2016-07-20
HUE028905T2 (en) 2017-01-30
ES2641550T3 (en) 2017-11-10
CA2784798C (en) 2017-11-07
KR101837125B1 (en) 2018-03-09
JP2013514240A (en) 2013-04-25
EP3025977B1 (en) 2017-06-28
US9511902B2 (en) 2016-12-06
KR20170023199A (en) 2017-03-02
EP3025977A1 (en) 2016-06-01
PL3025977T3 (en) 2017-11-30
AU2010332628A1 (en) 2012-06-21
CA2784798A1 (en) 2011-06-23
FR2954291B1 (en) 2012-03-09
JP5716039B2 (en) 2015-05-13
PL2512937T3 (en) 2016-09-30
BR112012014195A2 (en) 2017-04-04
CN102725198A (en) 2012-10-10
MA33749B1 (en) 2012-11-01
WO2011073583A1 (en) 2011-06-23
CN104044796A (en) 2014-09-17
CN102725198B (en) 2014-12-10
DK2512937T3 (en) 2016-07-04
FR2954291A1 (en) 2011-06-24
CN104044796B (en) 2016-06-08
KR101877328B1 (en) 2018-08-07
EP2512937B1 (en) 2016-03-30
RU2012130132A (en) 2014-01-27
ZA201203384B (en) 2013-01-30
RU2555947C2 (en) 2015-07-10
US20120255262A1 (en) 2012-10-11
HUE034520T2 (en) 2018-02-28

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