EP0524516B1 - Réceptacle métallique tronconique et procédé pour le fabriquer - Google Patents

Réceptacle métallique tronconique et procédé pour le fabriquer Download PDF

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Publication number
EP0524516B1
EP0524516B1 EP92111868A EP92111868A EP0524516B1 EP 0524516 B1 EP0524516 B1 EP 0524516B1 EP 92111868 A EP92111868 A EP 92111868A EP 92111868 A EP92111868 A EP 92111868A EP 0524516 B1 EP0524516 B1 EP 0524516B1
Authority
EP
European Patent Office
Prior art keywords
side wall
closed loop
lip
coning
cylindrical side
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
EP92111868A
Other languages
German (de)
English (en)
Other versions
EP0524516A1 (fr
Inventor
Vincenzo Cereda
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.)
Silfa Imballaggi Latta Fusti Acciaio Srl Soc
Original Assignee
Silfa Imballaggi Latta Fusti Acciaio Srl Soc
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.)
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Publication date
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Application filed by Silfa Imballaggi Latta Fusti Acciaio Srl Soc filed Critical Silfa Imballaggi Latta Fusti Acciaio Srl Soc
Publication of EP0524516A1 publication Critical patent/EP0524516A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/2646—Of particular non cylindrical shape, e.g. conical, rectangular, polygonal, bulged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
    • B65D7/12—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls

Definitions

  • the invention consists of a '3-piece' truncated cone shaped container which is made of welded sheet metal and has absolutely smooth internal surface, so that the container can be easily cleaned and its contents completely removed.
  • the container is easy to stack, and has ring shaped upper lip that is concave in the centre.
  • Metal containers, with lids, are often used to contain, pack, and transport a large number of very different products in a wide range of technical fields.
  • food products ice-cream, confectionary, dressings, and sauces, etc.
  • agricultural products and their derivates fruit, vegetables, juices, sauces, and concentrates, etc.
  • chemical products all types of ink, putty, paints, dyes, and solvents, etc.
  • Cylindrical or truncated cone shaped containers stiffened by grooves or reinforcing ribs on their side walls are both well known and widely used, however the reinforcing ribs can create serious problems both from an economic and ecological point of view. If containers can be completely cleaned, the product, often expensive, packed in them can be completely consumed, thus making the containers themselves easier to recover and recycle, and avoiding (or at least helping to avoid) containers with not inconsiderable quantities of the products packed in them (often hazardous and polluting) being dumped in the environment.
  • containers with totally smooth interiors in other words without any grooves or ribbing in which hard to remove deposits of the material packed in them can form.
  • the interior of completely smooth containers is easier to clean with brushes and/or jets of water or solvent, for example.
  • the smooth containers (preferably truncated cone shaped ones) available on the market are made by drawing a normally pre-painted and/or pre-printed metal sheet and folding the edge into a lip in one or more rolling stages.
  • the truncated cone shape makes the sheet metal drawing process easier and makes it possible to stack the containers, thus saving space; the external lip allows, amongst other things, to handle the containers easily, to attach the lid well, and to easily separate two containers that have been stacked one inside the other.
  • '3-piece' (lid, side wall, and base) truncated cone shaped containers are also well known and widely available on the market, and do not suffer from the above mentioned disadvantages, as:
  • the term 'metal sheet' is used to signify any type of tinned or chromed strip, or even more generally, any type of thin metal sheet that is protected and is suitable for manufacturing the above described containers.
  • the object of the present invention is a container made of welded sheet metal and including a truncated cone-shaped side wall with a smooth interior and a base attached to the side wall by a folded seam, said container being characterized in that the upper edge of the side wall is cone-shaped and folded to produce a closed, curvilinear ring-shaped lip which comprises a concave central area.
  • a particularly advantageous method for manufacturing the above mentioned container is a further object of the present invention.
  • Figure 1 is a partly cross-sectioned view of a container (1) according to the invention - in the attached figures, the lid is always omitted in order to make the drawings easier to understand.
  • the truncated cone shaped smooth side wall (2) is visible in figure 1, to which the base (3) is attached by a folded seam. As can be seen, the lower part of the side wall (2) has a narrower area (4) deep enough for the folded seam area (5) attaching the base (3) to the side wall (2) to be within the truncated cone shape of the side wall (2).
  • the upper edge of the side wall (2) is folded over, preferably by pressure-forming, to form a ring shaped lip (6) with a central concave area (7), as can be seen clearly from the cross-section on the left of figure 1 and the cross-section shown in figure 4.
  • a simple and efficient method of producing a container according to the invention, including the ring-shaped lip (6) with the particular cross-section shown in figures 1 and 4, is described with reference to the other figures.
  • the ring shaped edge (6) enables the lid to be attached and removed from the container more easily, and to separate two containers that have been stacked one inside the other to reduce storage space.
  • the dimensions of the ring shaped lip (6) are such that the lower part of the ring shaped lip (6) of a container (1) makes contact with the upper part of the ring shaped lip (6) of a second container (1) that has been stacked inside the first.
  • Figure 2 schematically shows the main steps of the production process that is an object of the present invention.
  • step A The two edges of the side wall (2), obtained (step A) by rolling and then welding a piece of sheet metal, are worked, as will be fully described with reference to figure 3, to produce the fold area (10) and edge (13) (step B).
  • step B The side wall is then formed using a machine known to one skilled in the art as a 'coning' machine so that it becomes truncated cone shaped (step C), and the container is then completed by folding the seam that attaches the base (3) to the side wall (2) (step D).
  • Figure 3 shows a sequence of four steps of the process used to pass from step A to step B of figure 2.
  • the folded seam area (10) of the lower edge (11) of the side wall (2) is shaped by a first die (16) and prepared for being attached to the base (3) by a folded seam, and the upper edge (12) of the side wall (2) is shaped by a second die (17) to form a lip (13) consisting of a closed circular shaped loop (14).
  • this circular shaped looped lip is formed at the end of the production process and, in any case, once the container has assumed its final truncated cone shape: this enables the dimensions of the lip to be controlled with sufficient accuracy to ensure that the lid seals hermetically.
  • a characterizing feature of the production process according to the invention is the fact that the circular shaped closed loop lip (14) is produced whilst the side wall (2) is still cylindrical in shape, and is then further shaped by pressure exerted by the second die (17) until it forms an elongated shaped closed loop lip (15).
  • the two dies (16 and 17) consist of two suitably grooved discs that act simultaneoulsly at both edges (11 and 12) of the side wall (2) along the entire circumference of the side wall.
  • the second die (17) effects a second stroke of a length comparable with the larger axis of the elongated shaped loop (15).
  • a further characterizing feature of the production process according to the invention is the fact that the tensions that are created in the lip (13) when it is subjected to stretching during the 'coning' step, cause the permanent deforming of the central area of the lip (13) (which is less rigid than the external folded areas of the lip), and the concave area (7) is thus spontaneaously formed and does not require the use of molds, tools, or further production steps.
  • Figure 5 is a cross-section of a detail of a 'coning' machine (18) modified according to the invention.
  • the part of the 'coning machine' (18) with the narrowest diameter has a narrowed section (19) that is used during the 'coning' steps to create a narrower part (4) of the side wall (2) deep enough that once the seam folding stage following the 'coning' step has been completed, the folded seam (5) attaching the base (3) to the side wall (2) is within the truncated cone shape of the side wall (2).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Press Drives And Press Lines (AREA)

Claims (5)

  1. Récipient fabriqué en tôle soudée et comprenant une paroi latérale de forme tronconique (2) avec un intérieur lisse et une base (3) fixée sur ladite paroi latérale (2) par un joint replié (5), caractérisé en ce que le bord supérieur (12) de ladite paroi latérale (2) est en forme de cône et plié afin de produire une lèvre de forme annulaire curviligne fermée (6) qui comporte une zone centrale concave (7).
  2. Procédé de fabrication d'un récipient fabriqué en tôle soudée et comprenant une paroi latérale de forme tronconique avec un intérieur lisse et une base fixée sur la paroi latérale par un joint replié, ce procédé comprenant au moins les étapes suivantes :
    - réalisation d'une paroi latérale cylindrique (2) en découpant une section de tôle, en roulant cette section de tôle et en soudant ensuite ses extrémités ensemble;
    - formage d'un premier bord (11) de ladite paroi latérale cylindrique (2) de façon à pouvoir être fixée sur ladite base (3) par un joint replié;
    - formage de ladite paroi latérale cylindrique (2) par une machine de 〈〈 formation de cône 〉〉;
    - formage du deuxième bord (12) de ladite paroi latérale (2) afin d'obtenir une lèvre (13) avec une section de boucle fermée circulaire (14);
    - pliage dudit joint replié afin de fixer ladite base (3) sur ledit premier bord formé (11) de ladite paroi latérale cylindrique (2);
    et caractérisé en ce que :
    - ladite lèvre (13) avec une section de boucle fermée circulaire (14) est fabriquée avant formage de ladite paroi latérale cylindrique (2) par ladite machine de 〈〈 formation de cône 〉〉 (18);
    - ladite lèvre (13) avec une section de boucle fermée circulaire (14) est formée par pression jusqu'à ce qu'elle forme une lèvre en forme de boucle fermée allongée (15);
    - ladite lèvre en forme de boucle fermée allongée (15) est fabriquée avant formage de ladite paroi latérale cylindrique (2) par ladite machine de 〈〈 formation de cône 〉〉 (18);
    - lorsque ladite paroi latérale (2) est formée par ladite machine de 〈〈 formation de cône 〉〉 (18), la zone centrale de ladite lèvre en forme de boucle fermée allongée (15) se plie vers l'intérieur en formant ladite zone concave (7).
  3. Procédé selon la revendication 2, caractérisé en ce que lesdits premier et deuxième bords (11 et 12) de ladite paroi latérale cylindrique (2) sont formés simultanément par des matrices de presse, et en ce que ladite lèvre en forme de boucle fermée circulaire (14) obtenue par pression de matrice sur le deuxième bord (12) de ladite paroi latérale cylindrique (2) devient ladite lèvre en forme de boucle fermée allongée (15) du fait d'une autre pression axiale de la matrice correspondante (17).
  4. Procédé selon la revendication 3, caractérisé en ce que, une fois que ladite lèvre en forme de boucle fermée circulaire (14) a été formée sur ledit deuxième bord (12) de ladite paroi latérale cylindrique (2), ladite matrice correspondante (17) réalise une course supplémentaire dont la longueur est égale à la longueur du grand axe de ladite lèvre en forme de boucle fermée allongée (15).
  5. Procédé selon la revendication 2, caractérisé en ce que la partie étroite de ladite machine de 〈〈 formation de cône 〉〉 (18) a une section plus étroite (19) conçue afin de créer, pendant l'étape de 〈〈 formation de cône 〉〉, une section plus étroite (4) dans la partie inférieure de ladite paroi latérale (2) d'une profondeur telle que ledit joint replié (5) fixant ladite base (3) sur la paroi latérale (2) est dans la forme de tronc de cône de ladite paroi latérale (2).
EP92111868A 1991-07-18 1992-07-13 Réceptacle métallique tronconique et procédé pour le fabriquer Expired - Lifetime EP0524516B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI911989A IT1252322B (it) 1991-07-18 1991-07-18 Contenitore tronco - conico "a 3 pezzi" in lamierino saldato presentante superficie interna liscia, e metodo per realizzare detto contenitore.
ITMI911989 1991-07-18

Publications (2)

Publication Number Publication Date
EP0524516A1 EP0524516A1 (fr) 1993-01-27
EP0524516B1 true EP0524516B1 (fr) 1997-01-15

Family

ID=11360371

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92111868A Expired - Lifetime EP0524516B1 (fr) 1991-07-18 1992-07-13 Réceptacle métallique tronconique et procédé pour le fabriquer

Country Status (4)

Country Link
EP (1) EP0524516B1 (fr)
AT (1) ATE147696T1 (fr)
DE (1) DE69216702D1 (fr)
IT (1) IT1252322B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9909110D0 (en) * 1999-04-22 1999-06-16 Crown Cork & Seal Tech Corp Method of forming a can body

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2214422A (en) * 1937-06-08 1940-09-10 Continental Can Co Sheet metal can body blank
CH608196A5 (en) * 1976-03-08 1978-12-29 Vogel Bmw Ag Method for the production of a sheet-metal container
DE2819490C2 (de) * 1978-05-03 1980-01-31 Karl Huber Verpackungswerke, 7110 Oehringen Behälter
DE3041001A1 (de) * 1980-10-31 1982-05-19 Wilhelm Bender & Söhne, Blechwarenfabrik, 3000 Hannover Kegelstumpffoermige feinblechdose sowie verfahren und vorichtung zu ihrer herstellung
DE3422040A1 (de) * 1984-06-14 1985-12-19 Heinz-Eckhard Dipl.-Ing. 6100 Darmstadt Engel Stuelp-umformverfahren zur herstellung von doppelwandigen zylindrischen werkstuecken sowie umformwerkzeug hierfuer

Also Published As

Publication number Publication date
ITMI911989A0 (it) 1991-07-18
ATE147696T1 (de) 1997-02-15
DE69216702D1 (de) 1997-02-27
EP0524516A1 (fr) 1993-01-27
ITMI911989A1 (it) 1993-01-18
IT1252322B (it) 1995-06-08

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