EP0669177B1 - Metal can for contents which may be tipped out, made from a body and a metal cover reclosable after opening, and manufacturing process of such a can. - Google Patents

Metal can for contents which may be tipped out, made from a body and a metal cover reclosable after opening, and manufacturing process of such a can. Download PDF

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Publication number
EP0669177B1
EP0669177B1 EP95400227A EP95400227A EP0669177B1 EP 0669177 B1 EP0669177 B1 EP 0669177B1 EP 95400227 A EP95400227 A EP 95400227A EP 95400227 A EP95400227 A EP 95400227A EP 0669177 B1 EP0669177 B1 EP 0669177B1
Authority
EP
European Patent Office
Prior art keywords
lid
shoulder
rolled edge
wall
heat
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.)
Expired - Lifetime
Application number
EP95400227A
Other languages
German (de)
French (fr)
Other versions
EP0669177A1 (en
Inventor
Gérard Heurteboust
Jean-François Secondé
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0669177A1 publication Critical patent/EP0669177A1/en
Application granted granted Critical
Publication of EP0669177B1 publication Critical patent/EP0669177B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
    • B65D7/02—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by shape
    • B65D7/04—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by shape of curved cross-section, e.g. cans of circular or elliptical cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/2653—Methods or machines for closing cans by applying caps or bottoms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • 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
    • B65D43/00—Lids or covers for rigid or semi-rigid containers
    • B65D43/02—Removable lids or covers
    • B65D43/0202—Removable lids or covers without integral tamper element
    • B65D43/0214—Removable lids or covers without integral tamper element secured only by friction or gravity
    • B65D43/022—Removable lids or covers without integral tamper element secured only by friction or gravity only on the inside, or a part turned to the inside, of the mouth of the container
    • 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
    • B65D55/00—Accessories for container closures not otherwise provided for
    • B65D55/02—Locking devices; Means for discouraging or indicating unauthorised opening or removal of closure
    • B65D55/06—Deformable or tearable wires, strings, or strips; Use of seals, e.g. destructible locking pins
    • B65D55/08—Annular elements encircling container necks
    • 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
    • B65D2401/00—Tamper-indicating means
    • 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
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00018—Overall construction of the lid
    • B65D2543/00064—Shape of the outer periphery
    • B65D2543/00074—Shape of the outer periphery curved
    • B65D2543/00092—Shape of the outer periphery curved circular
    • 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
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00018—Overall construction of the lid
    • B65D2543/00259—Materials used
    • B65D2543/00277—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
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444—Contact between the container and the lid
    • B65D2543/00481—Contact between the container and the lid on the inside or the outside of the container
    • B65D2543/0049—Contact between the container and the lid on the inside or the outside of the container on the inside, or a part turned to the inside of the mouth of the container
    • B65D2543/00509—Cup
    • 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
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444—Contact between the container and the lid
    • B65D2543/00481—Contact between the container and the lid on the inside or the outside of the container
    • B65D2543/00537—Contact between the container and the lid on the inside or the outside of the container on the outside, or a part turned to the outside of the mouth of the container
    • B65D2543/00546—NO contact

Definitions

  • the present invention relates to a method for manufacturing a metal box according to the preambles of claims 5 or 6, said box being consisting of a box body and a resealable cover after opening, said opening can be obtained without accessories, as well as a box, according to the preamble of claim 1 (see for example EP-A-0 453 573).
  • This type of resealable packaging with a re-adjustable lid after opening is particularly used in the food sector, because it allows partial consumption of the food product it contains and close the box to keep the rest.
  • the cover is commonly called a cover of the "styling” type, that is to say having a side wall in contact with the outer face of the skirt device of the body of the box, or metal packaging whose cover is commonly called “plug” type cover, that is to say having a side wall in contact with the inner face of the skirt device of the body of the box.
  • a ribbon metal is welded on the one hand to the side wall of the cover and on the other hand on the peripheral skirt of the body of the box. This ribbon secures of the cover on the body of the box and constitutes a safety device to ensure that the box has never been opened. It is indeed necessary to remove this metal tape when the first opening of the box.
  • This type of box is mainly used for conditioning of the pâté for example.
  • the manufacture of such a box is generally obtained by rolling and welding of a metal sheet to form a cylindrical skirt.
  • the end of the skirt intended to receive the cover is then axially deformed, so as to define two parts of different diameters, a first part, the diameter of which is the smallest, intended to receive the styling cover, and a second, longer part, the diameter of which is larger, intended to form the body of the box.
  • the end of the second part has a bottom generally crimped, while the end of the first part is rolled towards inside to avoid being hurtful.
  • the cover of such a box has a tubular wall, the outside diameter is substantially equal to the outside diameter of the second part of the skirt forming the body of the box, so that a tape can be welded between the body of the box and its cover.
  • Such a box obtained according to the method described above is relatively expensive and unattractive due to the presence of a weld longitudinal and the high number of operations required to manufacture it.
  • boxes of this type which are known require a very large number of operations for their manufacture.
  • the present invention relates to a metal box for canned food consisting of a body and a "cap" type cover resealable after opening, the opening of which can be obtained without accessory, the contents of which can be easily removed from the mold, either simple, inexpensive manufacturing, requiring only a reduced number of operations.
  • the present invention also relates to a method of manufacture of such a box.
  • the first object is reached, according to, the present invention, by a box metallic, in particular for canned food consisting of a body and at minus a cover, the body comprising a skirt peripheral and an outgoing ledge, characterized in that said protruding rim is fitted, in ascending steps, from the peripheral skirt, a shoulder and a heat-sealing track, in that that the cover consists of a bottom and a tubular wall, of which the free end consists of an outer rolled edge forming a track heat-sealed, and the outer wall of which is in contact with the wall interior of the peripheral skirt of the body, and in that it is provided with a ring for securing the cover to the heat-sealed body on the two so-called heat sealing tracks.
  • the metal box according to the invention as described in FIG. 1, consists of a body 1, a cover 2 at one of its ends and a bottom 11 set at its other end.
  • the bottom 11 set at one end of the body 1 is of the known type, of generally flat shape, possibly provided with stiffening ribs (not represented).
  • the body 1 comprises a skirt 3, cylindrical with an axis X-X of revolution in the embodiment shown.
  • the skirt 3 is provided, at one of its ends, with a flange of crimping 20 intended to cooperate with a crimping rim 21 of the bottom 11.
  • the skirt 3 comprises at the other end an outgoing rim 4 forming an annular collar provided in ascending steps from the skirt 3, a shoulder 5 and a heat-sealing track 6.
  • the outgoing ledge 4 is contained in a plane substantially perpendicular to the axis X-X of revolution of the body.
  • the cover 2 consists of an end wall 7 and a tubular wall 8, the end of which consists of a rolled edge 9 forming a heat-sealing track.
  • the rolled edge 9 can be an outer rolled edge or a rolled edge interior.
  • the dimensions of the body 1 and of the cover 2 are such that the cover 2 can be fitted into the body 1, the outer face of the wall tubular 8 of the cover being in contact with the inner face of the skirt 3 of the body 1, and the rolled edge 9 of the cover 2 being supported on the shoulder 5 of the body 1.
  • the rolled edge 9 is external and the heat-sealing track 6 is formed by a rolled edge outside.
  • the dimensions of the shoulder 5 and the rolled edge forming the heat-sealing track 6 of the body 1 and of the rolled edge 9 of the cover are such that the heat seal tracks formed by the two said rolled edges are contiguous and at the same level.
  • the box is provided with a planar connection ring 10 of the cover 2 on the body 1, heat-sealed on the two heat-sealing tracks formed by the two rolled edges.
  • This ring 10 seals the box according to the invention and constitutes a security element ensuring that said box has not been opened.
  • the securing ring 10 is made of aluminum, made of plastic or a material combining aluminum and material plastic.
  • the rolled edge forming the heat-sealing track 6 and the rolled edge 9 are crushed so to present two faces, respectively 6a, 6b and 9a, 9b planar and substantially parallel, which increases the active surface of the runways heat sealing formed by said rolled edges.
  • the box is consisting of a body 1, a cover 2 and a bottom 11.
  • the cover 2 is provided with an inside rolled edge 9 and the body 1 comprises a skirt 3 provided with an outgoing rim 4 forming an annular collar.
  • the outgoing ledge 4 is provided, in ascending steps from the skirt 3, a shoulder 5, a heat-sealing track 6 and a rolled edge outward 17.
  • the rolled edge 9 of the cover is crushed and the difference in level between the shoulder 5 and the heat-sealing track 6 is substantially equal to the thickness of the crushed rolled edge 9 of the cover.
  • the rolled edge 17 is only a rolled up anti-injury edge.
  • the rolled edge forming the heat-sealing track 6 and the rolled edge 9 can be worked for, in addition to the track function of heat sealing, performing other functions, without departing from the scope of the invention.
  • the rolled edge of the cover can have the general shape of a 8 horizontal crushed, which ensures the function of runway heat-sealing and to avoid any possibility of contact of the product contained in the box thus produced with the cutting edge of said cover.
  • a cylindrical metal box consisting of a body 1 and a complementary cover 2 made in the same metal, we use a metal blank having the shape of a disc (not represented).
  • a metal blank is stamped to form a hollow container 18 in the shape of a bell of thickness substantially constant as shown in Fig. 1.
  • This hollow container 18 has an end wall 7 and a peripheral lateral skirt 12, cylindrical with axis X-X in the example shown, and an external collar 19.
  • the hollow container 18 is separated into two elements 13 and 14 by cutting in a plane P perpendicular to the axis X-X and substantially parallel to the plane containing the end wall 7 of said hollow container 18, as shown in broken lines in FIG. 3.
  • the first element 13 obtained after separation of the hollow container 18 in two elements consists of the end wall 7 and a small part of the peripheral lateral skirt 12 of said hollow container 18, thus forming a tubular wall 8 having an open free end 20.
  • the tubular wall 8 measures between 5 and 20 mm.
  • the second element 14 obtained after separation of the hollow container in two elements consists of the rest of the peripheral side skirt 12 of the hollow container 18 and the outer flange 19. It therefore appears under the shape of a skirt 3, cylindrical with axis X-X in the exemplary embodiment shown, comprising an outer flange 19.
  • a third step we transform the first element 13 as a cover by deforming the tubular wall 8 to reduce its diameter and by shaping the free end 20 of the tubular wall 8 at the rolled edge 9, outside in the embodiment shown in FIG. 5.
  • the diameter of the tubular wall 8 is reduced so that its outside diameter is less than 1 to 5 hundredths of a millimeter inner diameter of the skirt 3.
  • the second element 14 is transformed into a body of box adapted to receive the cover while sparing on the collar exterior 19, in ascending steps from the skirt 3, successively a shoulder 5 and an outwardly rolled edge 17, as shown in the Fig. 6.
  • the shoulder 5 is intended to serve as a support flange at the edge rolled 9 of the cover when it is disposed on the body of the box.
  • the dimensions of the shoulder 5 and of the rolled edge 17 of the body of box 1 and the rolled edge 9 of the cover 2 are adapted so that the rolled edge 9 can be supported on the shoulder 5 when the cover 2 is arranged on the body 1 of the box, and so that the rolled edges respectively 9 and 17 are contiguous and substantially at the same level.
  • the cover 2 is placed on the body 1 of the box, the rolled edge 9 of the cover resting on the shoulder 5 of the body and the cover is secured to the body using an annular tape plan 10 glued or heat sealed.
  • the annular tape 10 for example of aluminum, made of material plastic or a material combining the two, is glued or heat sealed so as to overlap both the rolled edge 9 of the cover and the rolled edge 17 body, to form a peelable security tape.
  • the rolled edges 9 and 17 are crushed in a horizontal plane to form two substantially annular surfaces planes serving as a heat-sealing track for the safety ring, which makes the easier operation of bonding or heat sealing the ribbon 10.
  • the second element 14 in box body forming on the outer flange 19 of the second element 14, in ascending steps from the skirt 3, a shoulder 5, a heat-sealing track 6 and a rolled edge 17.
  • the rolled edge 9 of the cover 2 is crushed in a horizontal plane and the height of said crushed rolled edge 9 is equal to the difference level between the shoulder 5 and the heat-sealing track 6 of the body of the box, so that the upper face of the rolled edge 9 crushed cover 2 and the heat-sealing track 6 of the body 1 of the box are substantially coplanar.
  • a metal blank to form a hollow container 18 in the shape of a bell of thickness substantially constant, as shown in Fig. 7.
  • This hollow container 18 comprises a skirt 3, cylindrical with axis X-X in the example shown, having an open end, comprising a radially outer flange 19.
  • the end of the skirt 3 opposite the flange 19 has a radially inner small annular shoulder 22, from which extends a tubular side wall 8 closed by an end wall 7, circular with axis X-X in the example shown, and offset towards the outside of the skirt relative to the shoulder 22.
  • the hollow container 18 is then separated into two elements 23 and 24 by cutting in a plane P 'perpendicular to the axis X-X and substantially parallel to the plane containing the end wall 7, just above the shoulder 22, as shown in broken lines in FIG. 7.
  • the first element 23 obtained after separation of the hollow container 18 in two elements consists of the end wall 7, the wall tubular 8 and shoulder 22.
  • the second element 24 obtained after separation of the hollow container 18 in two elements, consists of the skirt 3 and the collar 19.
  • the tubular wall 8 measures between 5 and 20 mm.
  • a third step we transform the first element 23 in the cover by conforming the shoulder 22 on the outwardly rolled edge 9, as shown in Fig. 5.
  • the second element 24 is transformed into a body of box adapted to receive the cover by forming on the outer flange 19, in ascending steps from the skirt 3, successively a shoulder 5 and an outwardly rolled edge 17, as shown in FIG. 6.
  • the shoulder 5 is intended to serve as a support flange at the edge rolled 9 of the cover when it is disposed on the body of the box.
  • the dimensions of the shoulder 5 and of the rolled edge 17 of the body of box 1 and the rolled edge 9 of the cover 2 are adapted so that the rolled edge 9 can be supported on the shoulder 5 when the cover 2 is arranged on the body 1 of the box, and so that the rolled edges respectively 9 and 17 are contiguous and substantially at the same level.
  • the cover 2 is placed on the body 1 of the box, the rolled edge 9 of the cover resting on the shoulder 5 of the body and the cover is secured to the body using an annular tape plan 10 glued or heat sealed.
  • the annular tape 10 for example of aluminum, made of material plastic or a material combining the two, is glued or heat sealed so as to overlap both the rolled edge 9 of the cover and the rolled edge 17 body, to form a peelable security tape.
  • the rolled edges 9 and 17 are crushed in a horizontal plane to form two substantially annular surfaces planes serving as a heat-sealing track for the safety ring, which makes the easier operation of bonding or heat sealing the ribbon 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Artificial Fish Reefs (AREA)
  • Bridges Or Land Bridges (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Closing Of Containers (AREA)

Abstract

The can consists of a body (1) and a lid (2). The upper edge of the body is turned outwards to form a shoulder (5) with a thermo-seal rim (6a), and the lid has a base (7), a cylindrical wall (8) and a rolled rim (9) which forms a second thermo-seal rim (9a) with that of the body. The two thermo-seal rims are joined together by a flat ring (10) which seals the can; its other end is closed by a sealed base (11). The can and lid are made from a single metal blank which is stamped to form the main body of the container and a rounded bottom which is separated from it to make the lid. Both sections are then shaped to form the seal rims, and a flat base is made for and attached to the body.

Description

La présente invention concerne un procédé de fabrication d'une boíte métallique selon les préambules des revendications 5 ou 6, ladite boíte étant constituée d'un corps de boíte et d'un couvercle refermable après ouverture, dont ladite ouverture peut être obtenue sans accessoire, ainsi qu'une boíte, selon le préambule de la revendication 1 (voir par exemple EP-A-0 453 573).The present invention relates to a method for manufacturing a metal box according to the preambles of claims 5 or 6, said box being consisting of a box body and a resealable cover after opening, said opening can be obtained without accessories, as well as a box, according to the preamble of claim 1 (see for example EP-A-0 453 573).

Ce type d'emballage refermable dont le couvercle est réajustable après ouverture, est particulièrement utilisé dans le domaine alimentaire, car il permet de consommer partiellement le produit alimentaire qu'il contient et de refermer la boíte pour conserver le reste.This type of resealable packaging with a re-adjustable lid after opening, is particularly used in the food sector, because it allows partial consumption of the food product it contains and close the box to keep the rest.

Il est connu de réaliser des emballages métalliques dont le couvercle est communément appelé couvercle du type "coiffant", c'est-à-dire comportant une paroi latérale en contact avec la face extérieure de la jupe périphérique du corps de la boíte, ou des emballages métalliques dont le couvercle est communément appelé couvercle du type "bouchon", c'est-à-dire comportant une paroi latérale en contact avec la face intérieure de la jupe périphérique du corps de la boíte.It is known to produce metal packaging, the cover is commonly called a cover of the "styling" type, that is to say having a side wall in contact with the outer face of the skirt device of the body of the box, or metal packaging whose cover is commonly called "plug" type cover, that is to say having a side wall in contact with the inner face of the skirt device of the body of the box.

Dans le cas des emballages à couvercle dit "coiffant", un ruban métallique est soudé d'une part sur la paroi latérale du couvercle et d'autre part sur la jupe périphérique du corps de la boíte. Ce ruban assure la solidarisation du couvercle sur le corps de la boíte et constitue un organe de sécurité permettant d'assurer que la boíte n'a jamais été ouverte. Il est en effet nécessaire de retirer ce ruban métallique lors de la première ouverture de la boíte.In the case of packaging with a "styling" lid, a ribbon metal is welded on the one hand to the side wall of the cover and on the other hand on the peripheral skirt of the body of the box. This ribbon secures of the cover on the body of the box and constitutes a safety device to ensure that the box has never been opened. It is indeed necessary to remove this metal tape when the first opening of the box.

Ce type de boíte est principalement utilisé pour le conditionnement du pâté par exemple.This type of box is mainly used for conditioning of the pâté for example.

La fabrication d'une telle boíte est généralement obtenue par roulage-soudage d'une feuille métallique pour constituer une jupe cylindrique.The manufacture of such a box is generally obtained by rolling and welding of a metal sheet to form a cylindrical skirt.

L'extrémité de la jupe destinée à recevoir le couvercle est ensuite déformée axialement, de manière à définir deux parties de diamètres différents, une première partie, dont le diamètre est le plus petit, destinée à recevoir le couvercle coiffant, et une seconde partie, plus longue, dont le diamètre est le plus grand, destinée à former le corps de la boíte. The end of the skirt intended to receive the cover is then axially deformed, so as to define two parts of different diameters, a first part, the diameter of which is the smallest, intended to receive the styling cover, and a second, longer part, the diameter of which is larger, intended to form the body of the box.

L'extrémité de la seconde partie est munie d'un fond généralement serti, alors que l'extrémité de la première partie est roulée vers l'intérieur pour éviter d'être blessante.The end of the second part has a bottom generally crimped, while the end of the first part is rolled towards inside to avoid being hurtful.

Le couvercle d'une telle boíte comporte une paroi tubulaire dont le diamètre extérieur est sensiblement égal au diamètre extérieur de la seconde partie de la jupe formant corps de la boíte, de manière telle qu'un ruban puisse être soudé entre le corps de la boíte et son couvercle.The cover of such a box has a tubular wall, the outside diameter is substantially equal to the outside diameter of the second part of the skirt forming the body of the box, so that a tape can be welded between the body of the box and its cover.

Une telle boíte obtenue selon le procédé décrit ci-dessus est relativement coûteuse et peu esthétique du fait de la présence d'une soudure longitudinale et du nombre élevé d'opérations nécessaires à sa fabrication.Such a box obtained according to the method described above is relatively expensive and unattractive due to the presence of a weld longitudinal and the high number of operations required to manufacture it.

Un des inconvénients principaux de ce type de boíte réside dans la présence du ruban de solidarisation du couvercle et du corps car celui-ci est soudé entre le couvercle et le corps de la boíte en utilisant un alliage d'étain contenant une petite quantité de plomb.One of the main drawbacks of this type of box is the presence of the fastening tape of the cover and the body because it East soldered between the cover and the body of the box using a tin alloy containing a small amount of lead.

Or les normes en matière d'emballages destinés à l'alimentaire s'orientent vers une interdiction de l'usage d'une telle soudure du fait de la grande toxicité du plomb.The standards for packaging intended for food are moving towards a ban on the use of such welding due to the high lead toxicity.

Un autre inconvénient de ce type de boíte est qu'une telle boíte n'est pas démoulable du fait du rebord roulé vers l'intérieur ménagé à l'extrémité du corps de ladite boíte.Another disadvantage of this type of box is that such a box cannot be removed from the mold due to the inwardly rolled rim the end of the body of said box.

Il est connu pour tenter de remédier à ces inconvénients, d'utiliser des couvercles de type "bouchon" dont ledit couvercle est solidarisé sur le corps de la boíte au moyen d'un cordon annulaire thermoscellé.It is known to try to remedy these drawbacks, to use "cap" type lids, of which said cover is secured to the body of the box by means of a heat sealed annular bead.

Mais ce type de boíte, bien que permettant de s'affranchir du problème de soudure à l'étain, ne permet pas de s'affranchir du problème du démoulage.But this type of box, although allowing to overcome the soldering problem, does not overcome the problem of demoulding.

De plus, les boítes de ce type qui sont connues nécessitent un très grand nombre d'opérations pour leur fabrication.In addition, boxes of this type which are known require a very large number of operations for their manufacture.

La présente invention a pour objet une boíte métallique pour conserve alimentaire constituée d'un corps et d'un couvercle de type "bouchon" refermable après ouverture, dont l'ouverture peut être obtenue sans accessoire, dont le contenu peut être facilement démoulable, qui soit de fabrication simple, peu onéreuse, ne nécessitant qu'un nombre réduit d'opérations.The present invention relates to a metal box for canned food consisting of a body and a "cap" type cover resealable after opening, the opening of which can be obtained without accessory, the contents of which can be easily removed from the mold, either simple, inexpensive manufacturing, requiring only a reduced number of operations.

La présente invention a également pour objet un procédé de fabrication d'une telle boíte. The present invention also relates to a method of manufacture of such a box.

Le premier objet est atteint, selon, la présente invention, par une boíte métallique, notamment pour conserve alimentaire constituée d'un corps et au moins un couvercle, le corps comprenant une jupe périphérique et un rebord sortant, caractérisée en ce que ledit rebord sortant est muni, en gradins ascendants, à partir de la jupe périphérique, d'un épaulement et d'une piste de thermoscellage, en ce que le couvercle est constitué d'un fond et d'une paroi tubulaire, dont l'extrémité libre est constituée d'un bord roulé extérieur formant piste de thermoscellage, et dont la paroi extérieure est en contact avec la paroi intérieure de la jupe périphérique du corps, et en ce qu'elle est munie d'un anneau plan de solidarisation du couvercle sur le corps thermoscellé sur les deux dites pistes de thermoscellage.The first object is reached, according to, the present invention, by a box metallic, in particular for canned food consisting of a body and at minus a cover, the body comprising a skirt peripheral and an outgoing ledge, characterized in that said protruding rim is fitted, in ascending steps, from the peripheral skirt, a shoulder and a heat-sealing track, in that that the cover consists of a bottom and a tubular wall, of which the free end consists of an outer rolled edge forming a track heat-sealed, and the outer wall of which is in contact with the wall interior of the peripheral skirt of the body, and in that it is provided with a ring for securing the cover to the heat-sealed body on the two so-called heat sealing tracks.

Selon d'autres caractéristiques préférées :

  • le bord roulé du couvercle est en appui sur l'épaulement du corps de la boíte,
  • le bord roulé du couvercle est écrasé de manière à présenter deux faces sensiblement parallèles,
  • le corps est muni d'un couvercle à une de ses extrémités et d'un fond serti à l'autre extrémité.
According to other preferred characteristics:
  • the rolled edge of the cover bears on the shoulder of the body of the box,
  • the rolled edge of the cover is crushed so as to present two substantially parallel faces,
  • the body has a cover at one end and a bottom crimped at the other end.

Le deuxieme objet est atteint, selon la présente invention, par un procédé de fabrication d'une boíte métallique constituée d'un corps et d'un couvercle réalisés dans un même métal, dans lequel on emboutit un flan métallique pour former un récipient creux comportant un fond, une jupe latérale périphérique et une collerette radialement extérieure, caractérisé en ce qu'il comporte les étapes suivantes :

  • on sépare le récipient creux par découpe en deux éléments, un premier élément constitué du fond et d'une petite partie de la jupe latérale périphérique du récipient creux formant une paroi tubulaire, et un second élément constitué du reste de la jupe latérale périphérique du récipient creux, formant une jupe, et de la collerette extérieure,
  • on transforme le premier élément en couvercle en déformant la paroi tubulaire pour en réduire le diamètre et en conformant le bord libre de la paroi tubulaire en bord roulé vers l'extérieur, et le second élément en corps de boíte adapté pour recevoir ledit couvercle en formant sur la collerette extérieure, en gradins ascendants à partir de la jupe, un épaulement destiné à servir de collerette d'appui au bord roulé du couvercle, et un bord roulé vers l'extérieur,
  • on place le couvercle sur le corps, la face extérieure de la paroi tubulaire étant en contact avec la face intérieure de la jupe du corps, et le bord roulé en appui sur l'épaulement dudit corps, et
  • on solidarise le couvercle sur le corps au moyen d'un ruban annulaire plan collé ou thermoscellé.
The second object is achieved, according to the present invention, by a method of manufacturing a metal box consisting of a body and a cover made of the same metal, in which a metal blank is stamped to form a hollow container comprising a bottom, a peripheral lateral skirt and a radially outer flange, characterized in that it comprises the following steps:
  • the hollow container is separated by cutting into two elements, a first element consisting of the bottom and of a small part of the peripheral lateral skirt of the hollow container forming a tubular wall, and a second element consisting of the rest of the peripheral lateral skirt of the container hollow, forming a skirt, and of the external collar,
  • the first element is transformed into a cover by deforming the tubular wall to reduce its diameter and by shaping the free edge of the tubular wall into an edge rolled outwards, and the second element into a box body adapted to receive said cover by forming on the outer collar, in ascending steps from the skirt, a shoulder intended to serve as a support collar on the rolled edge of the cover, and an edge rolled outwards,
  • the cover is placed on the body, the outside face of the tubular wall being in contact with the inside face of the body skirt, and the rolled edge resting on the shoulder of said body, and
  • the cover is secured to the body by means of a planar annular tape bonded or heat-sealed.

Selon une variante de réalisation du procédé selon l'invention :

  • on emboutit un flan métallique pour former un récipient creux comportant une jupe, ayant une extrémité ouverte, comportant une collerette radialement extérieure, ledit procédé étant caractérisé en ce que l'extrémité de la jupe opposée à la collerette présente un petit épaulement annulaire radialement intérieur, à partir duquel s'étend une paroi latérale tubulaire fermée par une paroi d'extrémité et décalée vers l'extérieur de la jupe par rapport à l'épaulement, et en ce qu'il comporte les étapes suivantes :
  • on sépare le récipient creux par découpe en deux éléments, un premier élément constitué de la paroi d'extrémité, de la paroi tubulaire et de l'épaulement, et un second élément constitué de la jupe et de la collerette extérieure,
  • on transforme le premier élément en couvercle en conformant l'épaulement en bord roulé vers l'extérieur, et le second élément en corps de boíte adapté pour recevoir ledit couvercle en formant sur la collerette extérieure, en gradins ascendants à partir de la jupe, un épaulement destiné à servir de collerette d'appui au bord roulé du couvercle , et un bord roulé vers l'extérieur,
  • on place le couvercle sur le corps, la face extérieure de la paroi tubulaire étant en contact avec la face intérieure de la jupe du corps, et le bord roulé dudit couvercle en appui sur l'épaulement dudit corps, et
  • on solidarise le couvercle sur le corps au moyen d'un ruban annulaire plan collé ou thermoscellé.
According to an alternative embodiment of the method according to the invention:
  • a metal blank is stamped to form a hollow container comprising a skirt, having an open end, comprising a radially outer flange, said method being characterized in that the end of the skirt opposite to the flange has a small radially inner annular shoulder, from which extends a tubular side wall closed by an end wall and offset towards the outside of the skirt relative to the shoulder, and in that it comprises the following steps:
  • the hollow container is separated by cutting into two elements, a first element consisting of the end wall, the tubular wall and the shoulder, and a second element consisting of the skirt and the external collar,
  • the first element is transformed into a cover by shaping the shoulder on the edge rolled outwards, and the second element into a box body adapted to receive said cover by forming on the external collar, in ascending steps from the skirt, a shoulder intended to serve as a support flange at the rolled edge of the cover, and an edge rolled outwards,
  • the cover is placed on the body, the outside face of the tubular wall being in contact with the inside face of the skirt of the body, and the rolled edge of said cover bears on the shoulder of said body, and
  • the cover is secured to the body by means of a planar annular tape bonded or heat-sealed.

Selon d'autres caractéristiques préférée :

  • le bord roulé du couvercle est écrasé pour former une surface sensiblement plane servant de piste de thermoscellage,
  • les bords roulés respectivement du couvercle et du corps de la boíte sont écrasés pour former une surface sensiblement plane servant de piste de thermoscellage au ruban annulaire,
  • une piste de thermoscellage est ménagée sur le corps de la boíte entre l'épaulement et le bord roulé,
  • le diamètre de la paroi tubulaire est réduit de telle sorte que son diamètre extérieur soit inférieur de 1 à 5 centièmes de millimètres au diamètre intérieur de la jupe,
  • la dimension de l'épaulement est supérieure à l'épaisseur du métal des parois du récipient creux de 1 à 5 centièmes de millimètre.
According to other preferred characteristics:
  • the rolled edge of the cover is crushed to form a substantially flat surface serving as a heat-sealing track,
  • the rolled edges respectively of the cover and of the body of the box are crushed to form a substantially flat surface serving as a heat seal track with the annular tape,
  • a heat-sealing track is provided on the body of the box between the shoulder and the rolled edge,
  • the diameter of the tubular wall is reduced so that its outside diameter is 1 to 5 hundredths of a millimeter less than the inside diameter of the skirt,
  • the dimension of the shoulder is greater than the thickness of the metal of the walls of the hollow container by 1 to 5 hundredths of a millimeter.

Les caractéristiques et avantages apparaítront mieux à la suite de la description qui va suivre, donnée uniquement à titre d'exemple, faite en référence aux dessins annexés dans lesquels :

  • la Fig. 1 est une vue en coupe représentant un exemple de réalisation d'une boíte selon l'invention,
  • la Fig. 2 est une vue en coupe représentant un autre exemple de réalisation d'une boíte selon l'invention,
  • les Fig. 3 à 6 sont des vues en coupe représentant les différentes étapes du procédé selon l'invention,
  • la Fig. 7 est une vue en coupe représentant la première étape d'une variante de réalisation du procédé selon l'invention.
The characteristics and advantages will appear more clearly after the description which follows, given solely by way of example, made with reference to the appended drawings in which:
  • Fig. 1 is a sectional view showing an embodiment of a box according to the invention,
  • Fig. 2 is a sectional view showing another embodiment of a box according to the invention,
  • Figs. 3 to 6 are sectional views representing the different stages of the process according to the invention,
  • Fig. 7 is a sectional view showing the first step of an alternative embodiment of the method according to the invention.

La description ci-après est relative à une boíte métallique de forme cylindrique, mais il est bien évident qu'elle est applicable à d'autres formes comme par exemple oblongue ou de forme générale rectangulaire ou carrée.The description below relates to a metal box of cylindrical shape, but it is obvious that it is applicable to other shapes such as oblong or generally rectangular or square.

La boíte métallique selon l'invention, telle que décrite à la Fig. 1, est constituée d'un corps 1, d'un couvercle 2 à une de ses extrémités et d'un fond 11 serti à son autre extrémité.The metal box according to the invention, as described in FIG. 1, consists of a body 1, a cover 2 at one of its ends and a bottom 11 set at its other end.

Le fond 11 serti à une extrémité du corps 1 est du type connu, de forme générale plane, muni éventuellement de nervures de rigidification (non représentées).The bottom 11 set at one end of the body 1 is of the known type, of generally flat shape, possibly provided with stiffening ribs (not represented).

Le corps 1 comprend une jupe 3, cylindrique d'axe X-X de révolution dans l'exemple de réalisation représenté.The body 1 comprises a skirt 3, cylindrical with an axis X-X of revolution in the embodiment shown.

La jupe 3 est munie, à une de ses extrémités, d'un rebord de sertissage 20 destiné à coopérer avec un rebord de sertissage 21 du fond 11.The skirt 3 is provided, at one of its ends, with a flange of crimping 20 intended to cooperate with a crimping rim 21 of the bottom 11.

La jupe 3 comprend à l'autre extrémité un rebord sortant 4 formant collerette annulaire muni, en gradins ascendants à partir de la jupe 3, d'un épaulement 5 et une piste de thermoscellage 6. The skirt 3 comprises at the other end an outgoing rim 4 forming an annular collar provided in ascending steps from the skirt 3, a shoulder 5 and a heat-sealing track 6.

Préférentiellement, le rebord sortant 4 est contenu dans un plan sensiblement perpendiculaire à l'axe X-X de révolution du corps.Preferably, the outgoing ledge 4 is contained in a plane substantially perpendicular to the axis X-X of revolution of the body.

Le couvercle 2 est constitué d'une paroi d'extrémité 7 et d'une paroi tubulaire 8 dont l'extrémité est constituée d'un bord roulé 9 formant piste de thermoscellage.The cover 2 consists of an end wall 7 and a tubular wall 8, the end of which consists of a rolled edge 9 forming a heat-sealing track.

Le bord roulé 9 peut être un bord roulé extérieur ou un bord roulé intérieur.The rolled edge 9 can be an outer rolled edge or a rolled edge interior.

Les dimensions du corps 1 et du couvercle 2 sont telles que le couvercle 2 puisse être emboíté dans le corps 1, la face extérieure de la paroi tubulaire 8 du couvercle étant en contact avec la face intérieure de la jupe 3 du corps 1, et le bord roulé 9 du couvercle 2 étant en appui sur l'épaulement 5 du corps 1.The dimensions of the body 1 and of the cover 2 are such that the cover 2 can be fitted into the body 1, the outer face of the wall tubular 8 of the cover being in contact with the inner face of the skirt 3 of the body 1, and the rolled edge 9 of the cover 2 being supported on the shoulder 5 of the body 1.

Dans l'exemple de réalisation représenté Fig. 1, le bord roulé 9 est extérieur et la piste de thermoscellage 6 est formée par un bord roulé extérieur.In the embodiment shown in FIG. 1, the rolled edge 9 is external and the heat-sealing track 6 is formed by a rolled edge outside.

Dans ce cas, les dimensions de l'épaulement 5 et du bord roulé formant la piste de thermoscellage 6 du corps 1 ainsi que du bord roulé 9 du couvercle sont telles que les pistes de thermoscellage formées par les deux dits bords roulés soient contiguës et au même niveau.In this case, the dimensions of the shoulder 5 and the rolled edge forming the heat-sealing track 6 of the body 1 and of the rolled edge 9 of the cover are such that the heat seal tracks formed by the two said rolled edges are contiguous and at the same level.

La boíte est munie d'un anneau plan de solidarisation 10 du couvercle 2 sur le corps 1, thermoscellé sur les deux pistes de thermoscellage formées par les deux bords roulés.The box is provided with a planar connection ring 10 of the cover 2 on the body 1, heat-sealed on the two heat-sealing tracks formed by the two rolled edges.

Cet anneau 10 permet d'étanchéifier la boíte selon l'invention et constitue un élément de sécurité assurant que ladite boíte n'a pas été ouverte.This ring 10 seals the box according to the invention and constitutes a security element ensuring that said box has not been opened.

A titre d'exemple, l'anneau de solidarisation 10 est en aluminium, en matière plastique ou en un matériau combinant l'aluminium et la matière plastique.By way of example, the securing ring 10 is made of aluminum, made of plastic or a material combining aluminum and material plastic.

Dans l'exemple de réalisation représenté Fig. 1, le bord roulé formant la piste de thermoscellage 6 et le bord roulé 9 sont écrasés de manière à présenter deux faces, respectivement 6a, 6b et 9a, 9b planes et sensiblement parallèles, ce qui permet d'augmenter la surface active des pistes de thermoscellage formés par lesdits bords roulés.In the embodiment shown in FIG. 1, the rolled edge forming the heat-sealing track 6 and the rolled edge 9 are crushed so to present two faces, respectively 6a, 6b and 9a, 9b planar and substantially parallel, which increases the active surface of the runways heat sealing formed by said rolled edges.

Dans l'autre exemple de réalisation représenté Fig. 2, la boíte est constituée d'un corps 1, d'un couvercle 2 et d'un fond 11.In the other embodiment shown in FIG. 2, the box is consisting of a body 1, a cover 2 and a bottom 11.

Le couvercle 2 est muni d'un bord roulé 9 intérieur et le corps 1 comprend une jupe 3 munie d'un rebord sortant 4 formant collerette annulaire. The cover 2 is provided with an inside rolled edge 9 and the body 1 comprises a skirt 3 provided with an outgoing rim 4 forming an annular collar.

Le rebord sortant 4 est muni, en gradins ascendants à partir de la jupe 3, d'un épaulement 5, d'une piste de thermoscellage 6 et d'un bord roulé vers l'extérieur 17.The outgoing ledge 4 is provided, in ascending steps from the skirt 3, a shoulder 5, a heat-sealing track 6 and a rolled edge outward 17.

Le bord roulé 9 du couvercle est écrasé et la différence de niveau entre l'épaulement 5 et la piste de thermoscellage 6 est sensiblement égale à l'épaisseur du bord roulé écrasé 9 du couvercle.The rolled edge 9 of the cover is crushed and the difference in level between the shoulder 5 and the heat-sealing track 6 is substantially equal to the thickness of the crushed rolled edge 9 of the cover.

Dans ce cas, le bord roulé 17 n'est qu'un bord roulé anti-blessure.In this case, the rolled edge 17 is only a rolled up anti-injury edge.

Il est évident que le bord roulé formant la piste de thermoscellage 6 et le bord roulé 9 peuvent être travaillés pour, outre la fonction de piste de thermoscellage, assurer d'autres fonctions, sans sortir du cadre de l'invention. Ainsi par exemple le bord roulé du couvercle peut avoir la forme générale d'un 8 horizontal écrasé , ce qui permet d'assurer la fonction de piste de thermoscellage et d'éviter toute possibilité de contact du produit contenu dans la boíte ainsi réalisée avec l'arête de coupe dudit couvercle.It is obvious that the rolled edge forming the heat-sealing track 6 and the rolled edge 9 can be worked for, in addition to the track function of heat sealing, performing other functions, without departing from the scope of the invention. So for example the rolled edge of the cover can have the general shape of a 8 horizontal crushed, which ensures the function of runway heat-sealing and to avoid any possibility of contact of the product contained in the box thus produced with the cutting edge of said cover.

Pour obtenir selon l'invention, une boíte métallique cylindrique constituée d'un corps 1 et d'un couvercle 2 complémentaire réalisés dans le même métal, on utilise un flan métallique ayant la forme d'un disque (non représenté).To obtain according to the invention, a cylindrical metal box consisting of a body 1 and a complementary cover 2 made in the same metal, we use a metal blank having the shape of a disc (not represented).

Dans une première étape, un flan métallique est embouti pour former un récipient creux 18 en forme de cloche d'épaisseur sensiblement constante tel que représenté à la Fig. 1.In a first step, a metal blank is stamped to form a hollow container 18 in the shape of a bell of thickness substantially constant as shown in Fig. 1.

Ce récipient creux 18 comporte une paroi d'extrémité 7 et une jupe latérale périphérique 12, cylindrique d'axe X-X dans l'exemple représenté, et une collerette extérieure 19.This hollow container 18 has an end wall 7 and a peripheral lateral skirt 12, cylindrical with axis X-X in the example shown, and an external collar 19.

Dans une seconde étape, le récipient creux 18 est séparé en deux éléments 13 et 14 par découpe dans un plan P perpendiculaire à l'axe X-X et sensiblement parallèle au plan contenant la paroi d'extrémité 7 dudit récipient creux 18, tel que représenté en trait interrompu sur la Fig. 3.In a second step, the hollow container 18 is separated into two elements 13 and 14 by cutting in a plane P perpendicular to the axis X-X and substantially parallel to the plane containing the end wall 7 of said hollow container 18, as shown in broken lines in FIG. 3.

Le premier élément 13 obtenu après séparation du récipient creux 18 en deux éléments est constitué de la paroi d'extrémité 7 et d'une petite partie de la jupe latérale périphérique 12 dudit récipient creux 18, formant ainsi une paroi tubulaire 8 présentant une extrémité libre ouverte 20.The first element 13 obtained after separation of the hollow container 18 in two elements consists of the end wall 7 and a small part of the peripheral lateral skirt 12 of said hollow container 18, thus forming a tubular wall 8 having an open free end 20.

De manière préférentielle, la paroi tubulaire 8 mesure entre 5 et 20 mm.Preferably, the tubular wall 8 measures between 5 and 20 mm.

Le second élément 14 obtenu après séparation du récipient creux en deux éléments est constitué du reste de la jupe latérale périphérique 12 du récipient creux 18 et de la collerette extérieure 19. Il se présente donc sous la forme d'une jupe 3, cylindrique d'axe X-X dans l'exemple de réalisation représenté, comportant une collerette extérieure 19.The second element 14 obtained after separation of the hollow container in two elements consists of the rest of the peripheral side skirt 12 of the hollow container 18 and the outer flange 19. It therefore appears under the shape of a skirt 3, cylindrical with axis X-X in the exemplary embodiment shown, comprising an outer flange 19.

Dans une troisième étape, on transforme le premier élément 13 en couvercle en déformant la paroi tubulaire 8 pour en réduire le diamètre et en conformant l'extrémité libre 20 de la paroi tubulaire 8 en bord roulé 9, extérieur dans l'exemple de réalisation représenté à la Fig. 5.In a third step, we transform the first element 13 as a cover by deforming the tubular wall 8 to reduce its diameter and by shaping the free end 20 of the tubular wall 8 at the rolled edge 9, outside in the embodiment shown in FIG. 5.

Le diamètre de la paroi tubulaire 8 est réduit de telle sorte que son diamètre extérieur soit inférieur de 1 à 5 centièmes de millimètres au diamètre intérieur de la jupe 3.The diameter of the tubular wall 8 is reduced so that its outside diameter is less than 1 to 5 hundredths of a millimeter inner diameter of the skirt 3.

Parallèlement, on transforme le second élément 14 en corps de boíte adapté pour recevoir le couvercle en ménageant sur la collerette extérieure 19, en gradins ascendants à partir de la jupe 3, successivement un épaulement 5 et un bord roulé vers l'extérieur 17, comme représenté à la Fig. 6.At the same time, the second element 14 is transformed into a body of box adapted to receive the cover while sparing on the collar exterior 19, in ascending steps from the skirt 3, successively a shoulder 5 and an outwardly rolled edge 17, as shown in the Fig. 6.

L'épaulement 5 est destiné à servir de collerette d'appui au bord roulé 9 du couvercle lorsque celui-ci est disposé sur le corps de la boíte.The shoulder 5 is intended to serve as a support flange at the edge rolled 9 of the cover when it is disposed on the body of the box.

Les dimensions de l'épaulement 5 et du bord roulé 17 du corps de boíte 1 ainsi que du bord roulé 9 du couvercle 2 sont adaptées pour que le bord roulé 9 puisse être en appui sur l'épaulement 5 lorsque le couvercle 2 est disposé sur le corps 1 de la boíte, et pour que les bords roulés respectivement 9 et 17 soient contigus et sensiblement au même niveau.The dimensions of the shoulder 5 and of the rolled edge 17 of the body of box 1 and the rolled edge 9 of the cover 2 are adapted so that the rolled edge 9 can be supported on the shoulder 5 when the cover 2 is arranged on the body 1 of the box, and so that the rolled edges respectively 9 and 17 are contiguous and substantially at the same level.

Ces trois étapes étant réalisées, le couvercle 2 est disposé sur le corps 1 de la boíte, le bord roulé 9 du couvercle reposant sur l'épaulement 5 du corps et on solidarise le couvercle sur le corps au moyen d'un ruban annulaire plan 10 collé ou thermoscellé.These three steps being carried out, the cover 2 is placed on the body 1 of the box, the rolled edge 9 of the cover resting on the shoulder 5 of the body and the cover is secured to the body using an annular tape plan 10 glued or heat sealed.

Le ruban annulaire 10, par exemple en aluminium, en matière plastique ou en un matériau associant les deux, est collé ou thermoscellé de manière à chevaucher à la fois le bord roulé 9 du couvercle et le bord roulé 17 du corps, pour constituer un ruban de sécurité pelable.The annular tape 10, for example of aluminum, made of material plastic or a material combining the two, is glued or heat sealed so as to overlap both the rolled edge 9 of the cover and the rolled edge 17 body, to form a peelable security tape.

De manière préférentielle, les bords roulés 9 et 17 sont écrasés dans un plan horizontal pour former deux surfaces annulaires sensiblement planes servant de piste de thermoscellage à l'anneau de sécurité, ce qui rend l'opération de collage ou thermoscellage du ruban 10 plus aisée. Preferably, the rolled edges 9 and 17 are crushed in a horizontal plane to form two substantially annular surfaces planes serving as a heat-sealing track for the safety ring, which makes the easier operation of bonding or heat sealing the ribbon 10.

L'ensemble corps 1 - couvercle 2 solidarisé par le ruban 10, ainsi réalisé est ensuite rempli et un fond 11 est fixé par sertissage à l'extrémité du corps 1 non muni du couvercle 2The whole body 1 - cover 2 secured by the ribbon 10, thus produced is then filled and a bottom 11 is fixed by crimping to the end of the body 1 not fitted with cover 2

Selon une variante de réalisation du procédé, on transforme le second élément 14 en corps de boíte en formant sur la collerette extérieure 19 du second élément 14, en gradins ascendants à partir de la jupe 3, un épaulement 5, une piste de thermoscellage 6 et un bord roulé 17.According to an alternative embodiment of the method, the second element 14 in box body forming on the outer flange 19 of the second element 14, in ascending steps from the skirt 3, a shoulder 5, a heat-sealing track 6 and a rolled edge 17.

Dans ce cas, le bord roulé 9 du couvercle 2 est écrasé dans un plan horizontal et la hauteur dudit bord roulé 9 écrasé est égale à la différence de niveau entre l'épaulement 5 et la piste de thermoscellage 6 du corps de la boíte, de manière à ce que la face supérieure du bord roulé 9 écrasé du couvercle 2 et la piste de thermoscellage 6 du corps 1 de la boíte soient sensiblement coplanaires.In this case, the rolled edge 9 of the cover 2 is crushed in a horizontal plane and the height of said crushed rolled edge 9 is equal to the difference level between the shoulder 5 and the heat-sealing track 6 of the body of the box, so that the upper face of the rolled edge 9 crushed cover 2 and the heat-sealing track 6 of the body 1 of the box are substantially coplanar.

Une variante de mise en oeuvre du procédé, dont la première étape est représentée à la Fig. 7, est décrite ci-après, les différentes parties de la boíte portant le même numéro de référence que celui utilisé lors de la description du procédé en référence aux Fig. 3 à 6.A variant implementation of the method, the first of which step is shown in Fig. 7, is described below, the different parts of the box with the same reference number as that used during the description of the process with reference to Figs. 3 to 6.

Dans une première étape on emboutit un flan métallique pour former un récipient creux 18 en forme de cloche d'épaisseur sensiblement constante, comme représenté à la Fig. 7.In a first step we stamp a metal blank to form a hollow container 18 in the shape of a bell of thickness substantially constant, as shown in Fig. 7.

Ce récipient creux 18 comporte une jupe 3, cylindrique d'axe X-X dans l'exemple représenté, ayant une extrémité ouverte, comportant une collerette 19 radialement extérieure.This hollow container 18 comprises a skirt 3, cylindrical with axis X-X in the example shown, having an open end, comprising a radially outer flange 19.

L'extrémité de la jupe 3 opposée à la collerette 19 présente un petit épaulement annulaire 22 radialement intérieur, à partir duquel s'étend une paroi latérale tubulaire 8 fermée par une paroi d'extrémité 7, circulaire d'axe X-X dans l'exemple représenté, et décalée vers l'extérieur de la jupe par rapport à l'épaulement 22.The end of the skirt 3 opposite the flange 19 has a radially inner small annular shoulder 22, from which extends a tubular side wall 8 closed by an end wall 7, circular with axis X-X in the example shown, and offset towards the outside of the skirt relative to the shoulder 22.

Le récipient creux 18 est ensuite séparé en deux éléments 23 et 24 par découpage dans un plan P' perpendiculaire à l'axe X-X et sensiblement parallèle au plan contenant la paroi d'extrémité 7, juste au dessus de l'épaulement 22, comme représenté en trait interrompu sur la Fig.7.The hollow container 18 is then separated into two elements 23 and 24 by cutting in a plane P 'perpendicular to the axis X-X and substantially parallel to the plane containing the end wall 7, just above the shoulder 22, as shown in broken lines in FIG. 7.

Le premier élément 23 obtenu après séparation du récipient creux 18 en deux éléments est constitué de la paroi d'extrémité 7, de la paroi tubulaire 8 et de l'épaulement 22. The first element 23 obtained after separation of the hollow container 18 in two elements consists of the end wall 7, the wall tubular 8 and shoulder 22.

Le second élément 24 obtenu après séparation du récipient creux 18 en deux éléments, est constitué de la jupe 3 et de la collerette 19.The second element 24 obtained after separation of the hollow container 18 in two elements, consists of the skirt 3 and the collar 19.

De manière préférentielle, la paroi tubulaire 8 mesure entre 5 et 20 mm.Preferably, the tubular wall 8 measures between 5 and 20 mm.

Dans une troisième étape, on transforme le premier élément 23 en couvercle en conformant l'épaulement 22 en bord roulé vers l'extérieur 9, comme représenté à la Fig. 5.In a third step, we transform the first element 23 in the cover by conforming the shoulder 22 on the outwardly rolled edge 9, as shown in Fig. 5.

Parallèlement, on transforme le second élément 24 en corps de boíte adapté pour recevoir le couvercle en formant sur la collerette extérieure 19, en gradins ascendants à partir de la jupe 3, successivement un épaulement 5 et un bord roulé vers l'extérieur 17, comme représenté à la Fig. 6.At the same time, the second element 24 is transformed into a body of box adapted to receive the cover by forming on the outer flange 19, in ascending steps from the skirt 3, successively a shoulder 5 and an outwardly rolled edge 17, as shown in FIG. 6.

L'épaulement 5 est destiné à servir de collerette d'appui au bord roulé 9 du couvercle lorsque celui-ci est disposé sur le corps de la boíte.The shoulder 5 is intended to serve as a support flange at the edge rolled 9 of the cover when it is disposed on the body of the box.

Les dimensions de l'épaulement 5 et du bord roulé 17 du corps de boíte 1 ainsi que du bord roulé 9 du couvercle 2 sont adaptées pour que le bord roulé 9 puisse être en appui sur l'épaulement 5 lorsque le couvercle 2 est disposé sur le corps 1 de la boíte, et pour que les bords roulés respectivement 9 et 17 soient contigus et sensiblement au même niveau.The dimensions of the shoulder 5 and of the rolled edge 17 of the body of box 1 and the rolled edge 9 of the cover 2 are adapted so that the rolled edge 9 can be supported on the shoulder 5 when the cover 2 is arranged on the body 1 of the box, and so that the rolled edges respectively 9 and 17 are contiguous and substantially at the same level.

Ces trois étapes étant réalisées, le couvercle 2 est disposé sur le corps 1 de la boíte, le bord roulé 9 du couvercle reposant sur l'épaulement 5 du corps et on solidarise le couvercle sur le corps au moyen d'un ruban annulaire plan 10 collé ou thermoscellé.These three steps being carried out, the cover 2 is placed on the body 1 of the box, the rolled edge 9 of the cover resting on the shoulder 5 of the body and the cover is secured to the body using an annular tape plan 10 glued or heat sealed.

Le ruban annulaire 10, par exemple en aluminium, en matière plastique ou en un matériau associant les deux, est collé ou thermoscellé de manière à chevaucher à la fois le bord roulé 9 du couvercle et le bord roulé 17 du corps, pour constituer un ruban de sécurité pelable.The annular tape 10, for example of aluminum, made of material plastic or a material combining the two, is glued or heat sealed so as to overlap both the rolled edge 9 of the cover and the rolled edge 17 body, to form a peelable security tape.

De manière préférentielle, les bords roulés 9 et 17 sont écrasés dans un plan horizontal pour former deux surfaces annulaires sensiblement planes servant de piste de thermoscellage à l'anneau de sécurité, ce qui rend l'opération de collage ou thermoscellage du ruban 10 plus aisée.Preferably, the rolled edges 9 and 17 are crushed in a horizontal plane to form two substantially annular surfaces planes serving as a heat-sealing track for the safety ring, which makes the easier operation of bonding or heat sealing the ribbon 10.

L'ensemble corps 1 - couvercle 2 solidarisé par le ruban 10, ainsi réalisé est ensuite rempli et un fond 11 est fixé par sertissage à l'extrémité du corps 1 non muni du couvercle 2.The whole body 1 - cover 2 secured by the ribbon 10, thus produced is then filled and a bottom 11 is fixed by crimping to the end of the body 1 not provided with the cover 2.

La boíte, selon l'invention, ainsi que le procédé de fabrication d'une telle boíte, présentent les avantages suivants :

  • d'une part, du fait que tous les bords roulés le sont vers l'extérieur, la boíte est parfaitement démoulable,
  • d'autre part, le procédé selon l'invention ne comporte que trois étapes de fabrication et est donc peu onéreux.
The box according to the invention, as well as the method for manufacturing such a box, have the following advantages:
  • on the one hand, because all the rolled edges are outward, the box is perfectly demoldable,
  • on the other hand, the method according to the invention comprises only three manufacturing steps and is therefore inexpensive.

Claims (11)

  1. Metal tin, especially for keeping food, consisting of a body (1) and at least one lid (2), the body (1) comprising a standing wall (3) and an outgoing flange (4), characterized in that the said outgoing flange (4) is provided, as steps rising from the standing wall (3), with a shoulder (5) and with a heat-sealing track (6), in that the lid (2) consists of a bottom (7) and of a tubular wall (8), the free end of which consists of a rolled edge (9) forming a heat-sealing track and the outside surface of which is in contact with the inside surface of the peripheral standing wall (3) of the body (1), and in that it is provided with a flat ring (10) for fastening the lid (2) to the body (1), this ring being heat-sealed onto the two said heat-sealing tracks (6, 9).
  2. Metal tin according to Claim 1, characterized in that the rolled edge (9) of the lid (2) bears on the shoulder (5) of the body (1) of the tin.
  3. Metal tin according to Claims 1 and 2, characterized in that the rolled edge (9) of the lid is flattened so as to present two approximately parallel flat faces (9a, 9b).
  4. Metal tin according to one of Claims 1 to 3, characterized in that the body (1) is provided with a lid (2) at one of its ends and with a crimped bottom (11) at the other end.
  5. Process for manufacturing a metal tin according to Claims 1 to 4, in which a metal blank is drawn in order to form a hollow container (18) which includes a bottom (7), a peripheral side wall (12) and a radially external flange (19), and characterized in that it includes the following steps:
    the hollow container (18) is split by cutting it into two components, a first component (13), consisting of the bottom (7) and of a small part of the peripheral side wall (12) of the hollow body (18), forming a tubular wall (8), and a second element (14), consisting of the rest of the peripheral side wall (12) of the hollow container (18), forming a standing wall (3), and of the external flange (19),
    the first component (13) is converted into a lid by deforming the tubular wall (8) in order to reduce the diameter thereof and by shaping the free edge of the tubular wall (8) into an outwardly rolled edge (9) and the second component (14) is converted into the tin body designed to receive the said lid by forming, on the external flange (19), as steps rising from the standing wall (3), a shoulder (5), intended to serve as a bearing flange for the rolled edge (9) of the lid, and an outwardly rolled edge (17),
    the lid (2) is placed on the body (1), the outside face of the tubular wall (8) being in contact with the inside face of the standing wall (3) of the body (1), and the rolled edge (9) bearing on the shoulder (5) of the said body, and
    the lid (2) is fastened to the body (1) by means of an adhesively bonded or heat-sealed flat annular strip (10).
  6. Process for manufacturing a metal tin according to Claims 1 to 4, in which a metal blank is drawn in order to form a hollow container (18) which includes a standing wall (3), having an open end and including a radially external flange (19), characterized in that that end of the standing wall (3) which is opposite the flange (19) has a small radially internal annular shoulder (22), from which extends a tubular side wall (8) which is closed by an end wall (7) and is offset towards the inside of the standing wall (3) with respect to the shoulder (22), and in that it includes the following steps:
    the hollow container (18) is split by cutting it into two components, a first component (23), consisting of the end wall (7), the tubular wall (8), and the shoulder (22), and a second component (24) consisting of the standing wall (3) and the external flange (19),
    the first component (23) is converted into a lid by shaping the shoulder (22) into an outwardly rolled edge (9) and the second component (24) is converted into the tin body designed to receive the said lid by forming, on the external flange (19), as steps rising from the standing wall (3), a shoulder (5) intended to serve as a bearing flange for the rolled edge (9) of the lid, and an outwardly rolled edge (17),
    the lid (2) is placed on the body (1), the outside face of the tubular wall (8) being in contact with the inside face of the standing wall (3) of the body (1) and the rolled edge (9) of the said lid bearing on the shoulder (5) of the said body, and
    the lid (2) is fastened to the body (1) by means of an adhesively bonded or heat-sealed flat annular strip (10).
  7. Process for manufacturing a metal tin according to either of Claims 5 and 6, characterized in that the rolled edges (9, 17), of the lid (2) and the body (1) of the tin respectively, are flattened in order to form an approximately flat surface serving as the heat-sealing track of the annular strip (10).
  8. Process for manufacturing a metal tin according to either of Claims 5 and 6, characterized in that a heat-sealing track (6) is made on the body (1) of the tin between the shoulder (5) and the rolled edge (17).
  9. Process for manufacturing a metal tin according to Claims 5 or 6 and 7, characterized in that the rolled edge (9) of the lid (2) is flattened in order to form an approximately flat surface serving as a heat-sealing track.
  10. Process for manufacturing a metal tin according to Claim 5, characterized in that the diameter of the tubular wall (8) is reduced in such a way that its external diameter is less than the internal diameter of the standing wall (3) by from 1 to 5 hundredths of a millimetre.
  11. Process for manufacturing a metal tin according to Claim 6, characterized in that the length of the shoulder (22) is greater than the thickness of the metal of the walls of the hollow container (18) by from 1 to 5 hundredths of a millimetre.
EP95400227A 1994-02-24 1995-02-03 Metal can for contents which may be tipped out, made from a body and a metal cover reclosable after opening, and manufacturing process of such a can. Expired - Lifetime EP0669177B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9402102 1994-02-24
FR9402102A FR2716393B1 (en) 1994-02-24 1994-02-24 Metallic box for demouldable content consisting of a body and a reclosable metal cover after opening and method of manufacturing such a box.

Publications (2)

Publication Number Publication Date
EP0669177A1 EP0669177A1 (en) 1995-08-30
EP0669177B1 true EP0669177B1 (en) 1998-01-14

Family

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Application Number Title Priority Date Filing Date
EP95400227A Expired - Lifetime EP0669177B1 (en) 1994-02-24 1995-02-03 Metal can for contents which may be tipped out, made from a body and a metal cover reclosable after opening, and manufacturing process of such a can.

Country Status (4)

Country Link
EP (1) EP0669177B1 (en)
AT (1) ATE162121T1 (en)
DE (1) DE69501410D1 (en)
FR (1) FR2716393B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3110149B1 (en) * 2020-05-15 2022-05-20 Trivium Packaging Group Netherlands B V Metal tin can comprising a metal tin body and a metal lid, assembled by a peelable tab

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3295485A (en) * 1963-12-30 1967-01-03 American Can Co End closure
NL8005402A (en) * 1980-09-29 1982-04-16 Thomassen & Drijver A method for forming a peripheral edge protruded on a preformed metal cover.
EP0453573A4 (en) * 1989-11-13 1992-05-06 Sekisui Kagaku Kogyo Kabushiki Kaisha Sealed vessel and method of manufacturing the same

Also Published As

Publication number Publication date
ATE162121T1 (en) 1998-01-15
FR2716393B1 (en) 1996-04-12
DE69501410D1 (en) 1998-02-19
EP0669177A1 (en) 1995-08-30
FR2716393A1 (en) 1995-08-25

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