EP0243303B1 - Méthode de fabrication d'un joint soudé - Google Patents

Méthode de fabrication d'un joint soudé Download PDF

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Publication number
EP0243303B1
EP0243303B1 EP87810181A EP87810181A EP0243303B1 EP 0243303 B1 EP0243303 B1 EP 0243303B1 EP 87810181 A EP87810181 A EP 87810181A EP 87810181 A EP87810181 A EP 87810181A EP 0243303 B1 EP0243303 B1 EP 0243303B1
Authority
EP
European Patent Office
Prior art keywords
sheet metal
seam
pull tab
welded
edge
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
EP87810181A
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German (de)
English (en)
Other versions
EP0243303A1 (fr
Inventor
Siegfried Frei
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0243303A1 publication Critical patent/EP0243303A1/fr
Application granted granted Critical
Publication of EP0243303B1 publication Critical patent/EP0243303B1/fr
Anticipated expiration legal-status Critical
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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
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs
    • B21D51/386—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs on the side-wall of containers
    • 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
    • B21D51/2676—Cans or tins having longitudinal or helical seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/42—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions with cutting, punching, or cutter accommodating means
    • B65D17/46—Wires, strings or the like, e.g. rip cords
    • B65D17/462—Tearing-strips or -wires
    • B65D17/464—Tearing-strips or -wires with tongues or tags for engagement by slotted keys

Definitions

  • the invention relates to a method for producing a welded container according to the preamble of patent claim 1 and a container according to the preamble of patent claim 9.
  • Containers of the type mentioned are known.
  • soldered containers have been produced with a tear-off tongue that protrudes beyond the soldered joint seam, in order to separate the lid from the fuselage.
  • the tear-open tongue is part of the sheet metal blank forming the fuselage.
  • the sheet metal blanks are produced by punching out. After punching out, each sheet metal blank is bent into a cylindrical fuselage by means of a pair of wings, the edges to be connected are placed one above the other, held in this position until the solder used as a binder has hardened. A continuous production of hulls in one pass is not possible.
  • the present invention is therefore based on the object of providing a method for producing a welded container with a tear-open tongue which does not have the disadvantages of the known methods.
  • the object of the invention is to provide a method in which cans with a tear-open tongue can be produced on existing welding systems with as little technical and financial expenditure as possible.
  • the sheet metal blanks can be produced in a conventional manner on the machines already available from the can manufacturers and, on the other hand, can be welded on commercially available welding machines without costly changes and additional devices.
  • This also means that there is no need to purchase expensive machines that cut tongues, position the tongues on the sheet metal blanks and then weld them on.
  • the new method can be carried out at the previous location of the welding machine without requiring additional space.
  • Another advantage of the invention is that a fuselage can easily be provided with several pull tabs and then divided into several low hulls.
  • the tab is part of the fuselage, there is no risk that the tongue will tear off at the welding point when the welding machine is set incorrectly, as can occur in practice.
  • the tear-open tongue is subjected to tensile stress when it is torn open, in contrast to the welded-on tongues, in which the tongue above the weld point is loaded with shear when the key is opened.
  • the can can be welded in a machine like the one used to weld can bodies without a tear-open tongue, even very small quantities of cans with tabs can be economically produced in between by simply feeding them with a tongue instead of the usual cuts.
  • the weld seam 3 is visible at the front, the lid 5 at the top and the flanged edge 7 of the base 9 at the bottom and a tear-open tongue 11.
  • the fuselage 13 has at least two circumferential scratches 15 in the area of the tear-open tongue 11, along which the fuselage 13 can be separated.
  • the fuselage 13 consists of an initially flat sheet metal blank 17 (FIG. 2), in which the tongue 11 has also been punched out on an edge 18. Instead of egg A single tongue 11 can also be provided (shown in broken lines in Figures 2 and 3). Such multiple blanks are cut into several individual fuselages 13 after welding along the score 21.
  • the hull separation technique is not the subject of this invention and is therefore not described.
  • the blanks 17 are produced in a known manner on conventional machines, such as are available from the can manufacturers who produce tear-open cans on solder body markers. The production of the blanks 17 therefore need not be described in more detail.
  • the tear-open tongue 11 is bent over and lies essentially snugly on the surface of the blank 17.
  • the apex 23 of the folded tongue 11 is either exactly flush with the edge 18 or set back a distance x when the blanks (17) have a V-shaped or arcuate incision 26 on the side of the tear-open tongue (11).
  • the bending radius at the apex 23 is kept as small as possible due to strong pressure when folding, i.e. the inside radius is approximately zero; the outer one is approximately the same as the sheet thickness d.
  • the sheet metal blank 17 differs from a conventional one for a container 1 without a tear-open tongue 11 only in that in the area of the tongue 11 there is now twice the sheet thickness (2d). If the tongue 11 is turned over with high pressure, the thickness of the blank 17 is reduced to less than 2d.
  • a predetermined breaking point in the form of a notch 27 running parallel to the edge (18; 25) is made on the sheet metal blank 17 between the two incisions 15 (cf. also FIG. 4).
  • the notch 27 can be made before or after or when the tongue 11 is flipped over.
  • the notch 27 is made on the tongue side and has the shape of a "U", the two legs of which end at the edge 18 at the side of the base of the tongue 11 and lie outside the scratches t5.
  • the U-shaped notch 27 it is also possible to provide an arcuate or a rectilinear one, for example produced by shearing the blank 17.
  • the blanks 17 stacked in the usual manner are placed in the stacking device of a welding machine and welded like ordinary blanks 17 which have no tongues 11.
  • the welding current is preferably reduced in the area of the tab so that the weld seam does not overheat due to the increased pressure of the welding rollers.
  • the two edges 18 and 25 can be welded as a pinch seam or as an overlap seam. If a pinch seam is produced, the apex 23 of the tongue 11 must lie flush with the edge 18; If an overlap seam is produced, the apex 23 must be arranged at a distance x from the edge so that the weld seam 3 runs essentially directly over the apex 23.
  • the weld seam 3 is formed in a conventional manner between the roller electrodes of the resistance welding machine. As already mentioned, the weld seam 3 runs through the area of the apex 23 at the point of the folded tongue 11. Depending on the size of the welding current used, only a weld is made between the edges 18 and 25 or additionally to a small extent in the area of the inner radius 29 the folded tongue 11 (Fig. 4). The welding of the tongue surface to the surface of the fuselage 13 is so weak that the welding breaks open when the tongue 11 is lifted off.
  • the can body 1 which is now welded in a conventional manner in an existing can manufacturing system, can be beaded and crimped and provided with a base 9. At the bottler (canning factory) the lid 5 is still applied.
  • the consumer of the can 1 opens it in a manner known to him by grasping the tongue 11 with the enclosed key 31 and bending it radially to the fuselage 13 and pushing the key 31 close to the fuselage 13 (FIG. 5). He succeeds in this effortlessly, since the tongue 11 can be easily bent over. The detection of the tongue 11 is not a problem.
  • the notch 27 is when the seam is applied protection is also covered without additional measures.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)

Claims (12)

1. Procédé de fabrication d'un conteneur cylindrique soudé (1) à partir d'un flan (17) comprenant au moins deux sillons parallèles (15) et, entre les deux sillons (15), un ruban d'ouverture par traction qui, à l'extrémité des sillons (15), dépasse d'un bord (18) du flan (17) en formant une languette d'ouverture (11), procédé dans lequel on cylindre le flan (17) en une coque sensiblement cylindrique (13) et l'on soude ensemble les bords longitudinaux (18 et 25) qui se chevauchent, caractérisé en ce que
a - avant le cylindrage, on recourbe la languette d'ouverture (11) sur le flan plat (17), de telle façon que la languette d'ouverture (11) vienne s'appliquer de façon sensiblement étroite sur la face supérieure du flan (17), entre les sillons (15), et en ce que
b - l'on cylindre ensuite le flan (17) d'une manière usuelle en une coque (13) et on le soude dans une soudeuse à galets.
2. Procédé selon la revendication 1, caractérisé en ce que la crête (23) provenant du recourbement de la languette d'ouverture (11) se situe exactement à l'endroit du pliage de la languette (11) ou à une distance (x) du bord (18).
3. Procédé selon l'une des revendications 1 et 2, caractérisé en ce qu'on réalise une encoche (27) à une certaine distance du bord (18) ou (25), entre les deux sillons (15).
4. Procédé selon la revendication 3, caractérisé eu ce que l'encoche (27) s'étend parallèlement au bord (18 ; 25) ou en ce qu'elle a une forme d'arc ou de u.
5. Procédé selon la revendication 4, caractérisé en ce qu'on réalise l'encoche (27) avant, après ou lors du pliage de la languette d'ouverture (11).
6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que l'on réalise le cordon de soudure (3), reliant ensemble les deux bords (18) et (25) du flan (17), au-dessus de la crête (23) formée lors du pliage de la languette d'ouverture (11).
7. Procédé de fabrication d'une conteneur cylindrique selon l'une des revendications 1 à 6, caractérisé en ce que l'on réalise le cordon de soudure (3), reliant ensemble les deux bords (18) et (25) du flan (17) qui se chevauchent, à une distance (x) du bord extérieur (18).
8. Procédé selon la revendication 5, caractérise en ce que l'on forme le cordon de soudure (7) sur le bord intérieur (25) de façon à obtenir un cordon plat intérieurement et un cordon de recouvrement extérieurement.
9. Conteneur cylindrique (1) en tôle, comprenant au moins deux sillons sensiblement parallèles (15), s'étendant sur le pourtour de la coque (13) et formant entre eux un ruban d'ouverture par traction, et une languette d'ouverture par traction (11), qui fait partie du flan (17) formant la coque (13) et qui s'applique sensiblement sur la coque (13), caractérisé en ce que, au voisinage du bord soudé (18) avec lequel elle est reliée, la languette d'ouverture (11) est recourbée d'un angle de 180° de telle façon que la languette d'ouverture (11) s'applique entre les sillons (15) sur la face supérieure du conteneur cylindrique (1).
10. Conteneur cylindrique selon la revendication 9, caractérisé en ce que le cordon de soudure (3) s'étend au contact de la crête (23), à l'endroit de pliage de la languette d'ouverture recourbée (11).
11. Conteneur cylindrique selon l'une des revendications 9 et 10, caractérisé en ce que le cordon de soudure (3) s'étend à une distance (x) du bord extérieur (18).
12. Conteneur cylindrique selon la revendication 11, caractérisé en ce que le cordon de soudure (3) s'étend sur le bord intérieur (25) et en ce qu'il est prévu un cordon plat intérieurement et un cordon de recouvrement extérieurement.
EP87810181A 1986-04-12 1987-03-30 Méthode de fabrication d'un joint soudé Expired - Lifetime EP0243303B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1447/86 1986-04-12
CH144786 1986-04-12

Publications (2)

Publication Number Publication Date
EP0243303A1 EP0243303A1 (fr) 1987-10-28
EP0243303B1 true EP0243303B1 (fr) 1990-11-07

Family

ID=4210674

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87810181A Expired - Lifetime EP0243303B1 (fr) 1986-04-12 1987-03-30 Méthode de fabrication d'un joint soudé

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EP (1) EP0243303B1 (fr)
DE (1) DE3765987D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0433235A1 (fr) * 1989-12-11 1991-06-19 Siegfried Frei Procédé de fabrication de lignes de déchirage au ruban de déchirage et au couvercles déchirables ainsi que procédé de fabrication d'une rupture de commencement au ruban de déchirage et boîte ainsi obtenue

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE75622C (de) * J. ZlMMERMAN in 37'S Forest Avenue, Chicago, Tflinois, 'V. St. A Eine Ausführungsform der durch die Patentschrift Nr. 65207 bekannt gewordenen Conservenbüchse
US2339301A (en) * 1941-06-06 1944-01-18 American Can Co Container
DE1017042B (de) * 1955-10-21 1957-10-03 Continental Can Co Blechdose mit ueberlappt geschweisster Laengsnaht und Aufreissstreifen am Umfang des Rumpfes

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Publication number Publication date
DE3765987D1 (de) 1990-12-13
EP0243303A1 (fr) 1987-10-28

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