EP0243303A1 - Method for making a welded seam - Google Patents

Method for making a welded seam Download PDF

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Publication number
EP0243303A1
EP0243303A1 EP87810181A EP87810181A EP0243303A1 EP 0243303 A1 EP0243303 A1 EP 0243303A1 EP 87810181 A EP87810181 A EP 87810181A EP 87810181 A EP87810181 A EP 87810181A EP 0243303 A1 EP0243303 A1 EP 0243303A1
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EP
European Patent Office
Prior art keywords
tear
tongue
sheet metal
edge
fuselage
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87810181A
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German (de)
French (fr)
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EP0243303B1 (en
Inventor
Siegfried Frei
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Individual
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Individual
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    • 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 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.
  • the conventionally prepared sheet metal blanks with tear tabs cannot be processed.
  • Separately manufactured tongues are welded onto the fuselage in complex, multi-step operations before the longitudinal seam of the fuselage is welded, and the weld, which is five to ten millimeters away from the weld, must then be protected at least on the inside against corrosion (EP -A1-85810462.3).
  • 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 method.
  • 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 expense as possible.
  • the sheet metal blanks can be manufactured in a conventional manner on the machines already available from the can manufacturers and, on the other hand, they 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. There is also no special painting at the tab. The new process 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 be easily provided with several tear-open 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 tension when torn open, in contrast to the welded-on tongues, in which the tongue above the welding point is loaded with the key with shear when opened. Since the can can be welded in one machine, like they are used to weld can bodies without a tear-open tongue, even very small quantities of cans with tabs can be economically produced in between, simply by feeding them with a tongue instead of ordinary cuts.
  • 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 a single tongue 11, several can also be provided (in broken lines in the FIGS guren 2 and 3 shown). Such multiple cuts are cut into several individual hulls 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 and on conventional machines, 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 low as possible due to strong pressure when folding, ie the inside radius is approximately zero; the outside is about 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).
  • 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 (see also FIG. 4).
  • 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 on the side of the base of the tongue 11 and lie outside the scratches 15.
  • 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 two scoring 15 can be attached, two of which can be very close to each other.
  • the sheet metal blanks 17 have been produced with one or more tear-open tabs 11 and the tongue 11 has been folded into the plane of the sheet metal blank 17, this can be done in a simple manner in the punching machine for the sheet metal blank 17 or on a simple device provided for this purpose when the scoring 15 is applied can, 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 welding 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. In itself, it is not necessary to adapt the flex and single-round rolls on the welding machine to the blanks 17 which partially have a thickening, since the thickening can easily be absorbed by the rolls provided with an elastic coating.
  • the weld seam 3 is formed in a conventional manner between the roller electrodes of the resistance welding machine. At the location of the folded tongue 11, the weld seam 3 runs, as already mentioned, through the area of the apex 23. Depending on the size of the welding current used, there is only a welding 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 can body 1 which is now welded in a conventional manner in an existing can manufacturing system, can be corrugated and flanged 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 body 13 and pushing the key 31 up to close to the body 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. Now he turns the key 31 in the direction of arrow A (FIG. 6 or 9), ie he pulls on the tongue 11 and breaks the fuselage along the notch 25 between the scratches 15 (FIG. 7 or 9). By turning the key 31 further, the area 33 of the fuselage 13 lying between the two scratches 15 can be rolled onto the key 31 and the container 1 can be opened.
  • the notch 27 is also covered when applying the seam protection without additional measures.

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

Abstract

The method according to the invention relates to the production of a packaging container (1) with a tear-open tab (11) which consists of a folded-over part which projects above the edge (18) of the sheet- metal blank (17) forming the body (13) and the apex of which is, after folding over, welded to the opposite edge. <IMAGE>

Description

Gegenstand der Erfindung ist ein Verfahren zur Herstellung eines geschweissten Gebindes gemäss Oberbegriff des Patentanspruches 1 sowie ein Gebinde gemäss Oberbegriff des Patentanspruches 9.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.

Gebinde der genannten Gattung sind bekannt.Containers of the type mentioned are known.

Seit Jahrzehnten werden gelötete Gebinde mit einer die gelötete Fügenaht überragenden Aufreisszunge zum Abtrennen des Deckels vom Rumpf hergestellt. Die Aufreisszunge ist Teil des den Rumpf bildenden Blechzuschnittes. Die Herstellung der Blechzuschnitte erfolgt durch Ausstanzen.
Bei der Herstellung von geschweissten Dosen, die seit einigen Jahren immer mehr die gelöteten verdrängen, lassen sich die her­kömmlich vorbereiteten Blechzuschnitte mit Aufreisszungen nicht verarbeiten. Separat hergestellte Zungen werden dort in aufwen­digen, mehrere Schritte enthaltenden Arbeitsgängen vor dem Schweissen der Längsnaht des Rumpfes auf den Rumpf aufge­schweisst und die Schweissstelle, die in einem Abstand von fünf bis zehn Millimeter zur Schweissnaht liegt, muss anschliessend mindestens innen gegen Korrosion geschützt werden (EP-A1-­85810462.3).For decades, soldered containers have been produced with a tear-off tongue that protrudes beyond the soldered joint seam 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.
In the manufacture of welded cans, which have been replacing the soldered ones for a number of years, the conventionally prepared sheet metal blanks with tear tabs cannot be processed. Separately manufactured tongues are welded onto the fuselage in complex, multi-step operations before the longitudinal seam of the fuselage is welded, and the weld, which is five to ten millimeters away from the weld, must then be protected at least on the inside against corrosion (EP -A1-85810462.3).

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Herstellung eines geschweissten Gebindes mit einer Aufreisszunge zu schaffen, das die Nachteile des bekannten Ver­fahrens nicht aufweist. Insbesondere besteht die Aufgabe der Er­findung darin, ein Verfahren zu schaffen, bei dem mit möglichst geringem technischem und finanziellem Aufwand auf bestehenden Schweissanlagen Dosen mit einer Aufreisszunge hergestellt werden können.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 method. In particular, 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 expense as possible.

Diese Aufgabe wird gemäss den kennzeichnenden Merkmalen des Pa­tentanspruches 1 gelöst. Weitere vorteilhafte Ausgestaltungen werden in den abhängigen Ansprüchen beschrieben.This object is achieved according to the characterizing features of patent claim 1. Further advantageous configurations are described in the dependent claims.

Der grosse Vorteil des erfindungsgemässen Verfahrens besteht da­rin, dass einerseits die Blechzuschnitte auf den bereits bei den Dosenherstellern vorhandenen Maschinen in herkömmlicher Weise gefertigt und andererseits auf handelsüblichen Schweissmaschinen ohne kostspielige Aenderungen und Zusatzvorrichtungen ver­schweisst werden können. Es müssen auch dadurch keine teuren Ma­schinen angeschafft werden, mit denen Zungen zugeschnitten, die Zungen auf den Blechzuschnitten positioniert und anschliessend noch aufgeschweisst werden. Eine spezielle Lackierung an der Stelle der Lasche entfällt ebenfalls. Das neue Verfahren lässt sich ohne weiteren Platzbedarf am bisherigen Aufstellungsort der Schweissmaschine durchführen.
Ein weiterer Vorteil der Erfindung besteht auch darin, dass ohne weiteres ein Rumpf mit mehreren Aufreisslaschen versehen und an­schliessend in mehrere niedrige Rümpfe aufgeteilt werden kann. Da die Lasche Teil des Rumpfes ist, besteht im Gegensatz zur aufgeschweissten Zunge nicht die Gefahr, dass durch eine schlechte Einstellung der Schweissmaschine, wie es in der Praxis vorkommen kann, die Zunge sich beim Versuch, die Dose zu öffnen an der Schweissstelle abreisst. Die Aufreisszunge wird beim Auf­reissen auf Zug belastet, dies im Gegensatz zu den aufge­schweissten Zungen, bei denen die Zunge über der Schweissstelle beim Oeffnen mit dem Schlüssel auf Scherung belastet wird. Da die Schweissung der Dose in einer Maschine erfolgen kann, wie sie zur Schweissung von Dosenrümpfen ohne Aufreisszunge erfolgt, lassen sich auch sehr kleine Stückzahlen von mit einer Lasche versehenen Dosen zwischendurch wirtschaftlich herstellen, indem einfach anstelle von gewöhnlichen Zuschnitten solche mit einer Zunge zugeführt werden.The great advantage of the method according to the invention is that, on the one hand, the sheet metal blanks can be manufactured in a conventional manner on the machines already available from the can manufacturers and, on the other hand, they 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. There is also no special painting at the tab. The new process 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 be easily provided with several tear-open tabs and then divided into several low hulls. In contrast to the welded-on tongue, since 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 tension when torn open, in contrast to the welded-on tongues, in which the tongue above the welding point is loaded with the key with shear when opened. Since the can can be welded in one machine, like they are used to weld can bodies without a tear-open tongue, even very small quantities of cans with tabs can be economically produced in between, simply by feeding them with a tongue instead of ordinary cuts.

Anhand illustrierter Ausführungsbeispiele wird die Erfindung nä­her erläutert. Es zeigen:

  • Figur 1 ein Gebinde mit einer Aufreisszunge in perspektivischer Darstellung,
  • Figur 2 einen Blechzuschnitt mit einer Aufreisszunge,
  • Figur 3 einen Blechzuschnitt mit umgelegter Aufreisszunge,
  • Figur 4 einen räumlichen Schnitt durch einen Ausschnitt des fertigen Gebindes längs Linie VI-VI in Figur 1,
  • Figur 5 einen Schnitt durch eine mit einem Schlüssel teilweise aufgebogene Zunge,
  • Figur 6 einen Schnitt durch eine Zunge zu Beginn des Oeffnungs­vorganges,
  • Figur 7 einen Schnitt durch eine Zunge nach dem Aufbrechen des Gebindes an der Sollbruchstelle zwischen den beiden am Rumpf um laufenden Ritzungen,
  • Figur 8 einen räumlichen Schnitt durch einen Ausschnitt des fertigen Gebindes längs Linie VI-VI in Figur 1 mit u-­förmiger Kerbe,
  • Figur 9 einen Schnitt durch eine Zunge nach dem Aufbrechen des Gebindes an der Sollbruchstelle gemäss Figur 8.
The invention is explained in more detail on the basis of illustrated exemplary embodiments. Show it:
  • FIG. 1 shows a container with a tear-open tongue in a perspective view,
  • FIG. 2 shows a sheet metal blank with a tear-open tongue,
  • FIG. 3 shows a sheet metal blank with the tear-open tongue folded over,
  • FIG. 4 shows a spatial section through a section of the finished container along line VI-VI in FIG. 1,
  • FIG. 5 shows a section through a tongue partially bent open with a key,
  • FIG. 6 shows a section through a tongue at the beginning of the opening process,
  • FIG. 7 shows a section through a tongue after the container has been broken open at the predetermined breaking point between the two scratches around the fuselage,
  • FIG. 8 shows a spatial section through a section of the finished container along line VI-VI in FIG. 1 with a U-shaped notch,
  • 9 shows a section through a tongue after the container has been broken open at the predetermined breaking point according to FIG. 8.

An dem in der Figur 1 dargestellten Gebinde 1 ist vorne die Schweissnaht 3, oben der Deckel 5 und unten der Bördelrand 7 des Bodens 9 sowie eine Aufreisszunge 11 sichtbar. Der Rumpf 13 weist im Bereich der Aufreisszunge 11 mindestens zwei umlaufende Ritzungen 15 auf, entlang denen der Rumpf 13 aufgetrennt werden kann.
Der Rumpf 13 besteht aus einem anfänglich ebenen Blechzuschnitt 17 (Fig.2), bei dem an einer Kante 18 die Zunge 11 mitausge­stanzt worden ist. Anstelle einer einzigen Zunge 11 können auch mehrere vorgesehen werden (in gebrochenen Linien in den Fi­ guren 2 und 3 dargestellt). Solche Mehrfachzuschnitte werden nach dem Schweissen entlang der Ritzung 21 in mehrere einzelne Rümpfe 13 aufgetrennt. Die Technik des Trennens von Rümpfen ist nicht Gegenstand dieser Erfindung und wird daher nicht beschrie­ben.
Die Herstellung der Zuschnitte 17 erfolgt in bekannter Weise und auf herkömmlichen Maschinen, wie sie bei den Dosenherstellern, die Aufreissdosen auf Lötbodymakern herstellen, vorhanden sind. Die Herstellung der Zuschnitte 17 braucht deshalb nicht näher beschrieben zu werden.On the container 1 shown in FIG. 1, 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 a single tongue 11, several can also be provided (in broken lines in the FIGS guren 2 and 3 shown). Such multiple cuts are cut into several individual hulls 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 and on conventional machines, 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.

In der Figur 3 ist die Aufreisszunge 11 umgebogen und liegt im wesentlichen satt auf auf der Oberfläche des Zuschnittes 17 auf. Der Scheitel 23 der umgelegten Zunge 11 liegt entweder genau bündig zur Kante 18 oder in einem Abstand x zurückversetzt dazu, wenn die Zuschnitte (17) seitlich der Aufreisszunge (11) je einen v- oder bogenförmigen Einschnitt 26 aufweisen.
Der Biegeradius am Scheitel 23 ist durch starken Druck beim Um­legen so gering wie nur möglich gehalten, d.h. der innenliegende Radius ist annäherungsweise null; der aussenliegende etwa gleich wie die Blechdicke d.
Der Blechzuschnitt 17 unterscheidet sich von einem gewöhnlichen, für ein Gebinde 1 ohne Aufreisszunge 11 folglich nur dadurch, dass im Bereich der Zunge 11 nun die doppelte Blechstärke (2d) vorliegt. Wird beim Umlegen der Zunge 11 mit hohem Druck gear­beitet, so reduziert sich die Dicke des Zuschnittes 17 auf weni­ger als 2d.
In geringem Abstand von der Kante 25, die der Kante 18 gegen­überliegt, ist zwischen den beiden Ritzungen 15 eine Sollbruch­stelle in Gestalt einer parallel zur Kante (18;25) verlaufenden Kerbe 27 am Blechzuschnitt 17 angebracht (vergl. auch Figur 4). In den Figuren 8 und 9 ist die Kerbe 27 zungenseitig angebracht und weist die Gestalt eines "U" auf, dessen beide Schenkel seit­lich der Basis der Zunge 11 an der Kante 18 enden und ausserhalb der Ritzungen 15 liegen. Statt der U-förmigen Kerbe 27 kann auch eine bogenförmige oder eine geradlinige, beispielsweise durch Scherung des Zuschnittes 17 erzeugte vorgesehen werden.
Anstelle der beiden Ritzungen 15 können auch mehrere, z.B. drei oder vier Ritzungen 15 angebracht sein, wobei jeweils zwei sehr nahe beieinander liegen können.
Nach der Herstellung der Blechzuschnitte 17 mit einer oder meh­reren Aufreisszungen 11 und dem Umlegen der Zunge 11 in die Ebene des Blechzuschnittes 17, was auf einfache Weise in der Stanzmaschine für den Blechzuschnitt 17 oder auf einer ein­fachen, dafür vorgesehenen Vorrichtung beim Anbringen der Ritzungen 15 erfolgen kann, werden die in üblicher Weise gesta­pelten Zuschnitte 17 in die Abstapeleinrichtung einer Schweiss­maschine eingelegt und wie gewöhnliche Zuschnitte 17, die keine Zungen 11 aufweisen, verschweisst.
Vorzugsweise wird der Schweissstrom im Bereich der Lasche ver­mindert, damit durch den erhöhten Druck der Schweissrollen keine Ueberhitzung der Schweissnaht erzeugt wird.
Die beiden Kanten 18 und 25 können als Quetschnaht oder als Ue­berlapptnaht verschweisst werden. Wird eine Quetschnaht erzeugt, so muss der Scheitel 23 der Zunge 11 bündig zur Kante 18 liegen; wird eine Ueberlapptnaht erzeugt, so muss der Scheitel 23 im Ab­stand x zur Kante angeordnet sein, damit die Schweissnaht 3 im wesentlichen direkt über den Scheitel 23 verläuft.
An sich ist eine Anpassung der Flex- und Einrundwalzen an der Schweissmaschine an die partiell eine Verdickung aufweisenden Zuschnitte 17 nicht notwendig, da die Verdickung durch die mit einer elastischen Beschichtung versehenen Walzen ohne weiteres aufgenommen werden kann. Wenn aber nur solche oder sehr oft sol­che Zuschnitte 17 verarbeitet werden, kann es von Vorteil sein, die Flex- und Einrundwalzen an der Durchgangsstelle der Zunge 11 bzw. der Zungen 11 mit einem Einstich zu versehen.
Bei der Verschweissung eines mit einer Zunge 11 versehenen Zu­schnittes 17 erfolgt, wie bereits erwähnt, die Bildung der Schweissnaht 3 in herkömmlicher Weise zwischen den Rollenelek­troden der Widerstandsschweissmaschine. An der Stelle der umge­legten Zunge 11 verläuft die Schweissnaht 3 wie bereits erwähnt, durch den Bereich des Scheitels 23. Je nach Grösse des verwende­ten Schweissstromes erfolgt nur eine Verschweissung zwischen den Kanten 18 und 25 oder zusätzlich noch in geringem Mass im Be­reich des innneren Radius 29 der umgelegten Zunge 11 (Fig. 4). Die Verschweissung der Zungenoberfläche mit der Oberfläche des Rumpfes 13 ist so schwach, dass beim Abheben der Zunge 11 die Verschweissung aufbricht. Wenn die innenliegende Kante 25 in der Schweissnaht 3 liegt, die aussenliegende Kante 18 hingegen in einem Abstand dazu, wird innen eine Quetschnaht und aussen eine Überlapptnaht erzeugt. Dies hat keinen Einfluss beim späteren Öffnen der Dose 1, das anschliessend näher erläutert wird.In FIG. 3, 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 low as possible due to strong pressure when folding, ie the inside radius is approximately zero; the outside is about 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.
At a short distance from the edge 25, which lies opposite the edge 18, 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 (see also FIG. 4). In FIGS. 8 and 9, 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 on the side of the base of the tongue 11 and lie outside the scratches 15. Instead of 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.
Instead of the two scoring 15, several, for example three or four scoring 15 can be attached, two of which can be very close to each other.
After the sheet metal blanks 17 have been produced with one or more tear-open tabs 11 and the tongue 11 has been folded into the plane of the sheet metal blank 17, this can be done in a simple manner in the punching machine for the sheet metal blank 17 or on a simple device provided for this purpose when the scoring 15 is applied can, 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 welding 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.
In itself, it is not necessary to adapt the flex and single-round rolls on the welding machine to the blanks 17 which partially have a thickening, since the thickening can easily be absorbed by the rolls provided with an elastic coating. However, if only such or very often such blanks 17 are processed, it may be advantageous to provide the flex and single-round rolls with a recess at the passage point of the tongue 11 or the tongues 11.
When a blank 17 provided with a tongue 11 is welded, as already mentioned, the weld seam 3 is formed in a conventional manner between the roller electrodes of the resistance welding machine. At the location of the folded tongue 11, the weld seam 3 runs, as already mentioned, through the area of the apex 23. Depending on the size of the welding current used, there is only a welding 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 when tongue 11 is lifted, the weld breaks open. If the inner edge 25 lies in the weld seam 3, while the outer edge 18 is at a distance from it, a pinch seam is produced on the inside and an overlap seam is produced on the outside. This has no effect when the can 1 is opened later, which is subsequently explained in more detail.

Der nun in herkömmlicher Weise in einer bestehenden Dosenfer­tigungsanlage geschweisste Dosenrumpf 1 kann gesickt und gebör­delt sowie mit einem Boden 9 versehen werden. Beim Abfüller (Konservenfabrik) wird noch der Deckel 5 aufgebracht.The can body 1, which is now welded in a conventional manner in an existing can manufacturing system, can be corrugated and flanged and provided with a base 9. At the bottler (canning factory) the lid 5 is still applied.

Der Verbraucher der Dose 1 öffnet diese in ihm bekannter Weise, indem er mit dem beigefügten Schlüssel 31 die Zunge 11 erfasst und radial zum Rumpf 13 aufbiegt und den Schlüssel 31 bis nahe an den Rumpf 13 heranschiebt (Fig. 5). Dies gelingt ihm ohne Mühe, da sich die Zunge 11 leicht umbiegen lässt. Das Erfassen der Zunge 11 bietet kein Problem.
Nun dreht er den Schlüssel 31 in Richtung des Pfeiles A (Fig.6 oder 9), d.h. er zieht an der Zunge 11 und bricht den Rumpf entlang der Kerbe 25 zwischen den Ritzungen 15 auf (Fig. 7 oder 9). Durch weiteres Drehen am Schlüssel 31 kann der zwischen den beiden Ritzungen 15 liegende Bereich 33 des Rumpfes 13 auf den Schlüssel 31 aufgerollt und das Gebinde 1 geöffnet werden.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 body 13 and pushing the key 31 up to close to the body 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.
Now he turns the key 31 in the direction of arrow A (FIG. 6 or 9), ie he pulls on the tongue 11 and breaks the fuselage along the notch 25 between the scratches 15 (FIG. 7 or 9). By turning the key 31 further, the area 33 of the fuselage 13 lying between the two scratches 15 can be rolled onto the key 31 and the container 1 can be opened.

Die Kerbe 27 wird beim Aufbringen des Nahtschutzes ohne zusätz­liche Massnahmen ebenfalls abgedeckt.The notch 27 is also covered when applying the seam protection without additional measures.

Claims (12)

1. Verfahren zur Herstellung eines geschweissten Gebindes (1) aus Blech mit mindestens zwei im wesentlichen parallel lie­genden, am Umfang des Rumpfes (13) umlaufenden Ritzungen (15) und einer am Rumpf (13) zwischen den Ritzungen (15) angeordneten Aufreisszunge (11), dadurch gekennzeichnet, dass a. beim Zuschneiden oder Ausstanzen des Blechzuschnittes (17) für den Rumpf (13) an einer der zu verschweissenden Kanten (25) eine Aufreisszunge (11) ausgebildet wird, dass b. die Aufreisszunge (11) umgelegt wird, derart, dass die Aufreisszunge (11) auf die Oberfläche des Blechzuschnit­tes (17) aufzuliegen kommt und dass c. der Blechzuschnitt (17) in herkömmlicher Weise in einer Rollennaht-Schweissmaschine verschweisst wird. 1. A method for producing a welded container (1) from sheet metal with at least two essentially parallel scratches (15) on the circumference of the fuselage (13) and a tear-open tongue (11) arranged on the fuselage (13) between the scratches (15) ), characterized in that a. when cutting or punching out the sheet metal blank (17) for the fuselage (13) on one of the edges (25) to be welded, a tear-open tongue (11) is formed that b. the tear-open tongue (11) is folded over such that the tear-open tongue (11) comes to rest on the surface of the sheet metal blank (17) and that c. the sheet metal blank (17) is welded in a conventional manner in a roller seam welding machine. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Scheitel (23) der Zunge (11) bündig oder in einem Abstand (x) zur Kante (18) umgelegt wird.2. The method according to claim 1, characterized in that the apex (23) of the tongue (11) is folded flush or at a distance (x) to the edge (18). 3. Verfahren nach einem der Anspruche 1 und 2, dadurch gekenn­zeichnet, dass in einem Abstand von der Kante (18;25) zwischen den beiden Ritzungen (15) eine Kerbe (27) ange­bracht wird.3. The method according to any one of claims 1 and 2, characterized in that a notch (27) is made at a distance from the edge (18; 25) between the two incisions (15). 4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Kerbe (27) parallel zur Kante (18;25) verläuft oder dass sie bogen- oder u-förmig ausgebildet ist.4. The method according to claim 3, characterized in that the notch (27) runs parallel to the edge (18; 25) or that it is arched or U-shaped. 5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Kerbe (18;27) vor oder nach oder beim Umlegen der Aufreiss­zunge (11) angebracht wird.5. The method according to claim 4, characterized in that the notch (18; 27) is made before or after or when the tear-open tongue (11) is turned over. 6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekenn­zeichnet, dass die die beiden Kanten (18) und (25) des Blechzuschnittes (17) miteinander verbindende Schweissnaht (3) über den beim Umlegen der Aufreisszunge (11) gebildeten Scheitel (23) angebracht wird.6. The method according to any one of claims 1 to 5, characterized in that the two edges (18) and (25) of the The sheet metal blank (17) connecting the weld seam (3) is attached over the apex (23) formed when the tear-open tongue (11) is folded over. 7. Verfahren zur Herstellung eines Gebindes nach einem der An­sprüche 1 bis 6, dadurch gekennzeichnet, dass die die beiden Kanten (18) und (25) des Blechzuschnittes (17) miteinander verbindene Schweissnaht (3) in einem Abstand (x) von der Kante (18) angebracht wird.7. The method for producing a container according to one of claims 1 to 6, characterized in that the two edges (18) and (25) of the sheet metal blank (17) connecting weld seam (3) at a distance (x) from the edge (18) is attached. 8. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die Bildung der Schweissnaht (7) auf der innenliegenden Kante (25) erfolgt, so dass innen eine Quetschnaht und aussen eine Überlapptnaht entsteht.8. The method according to claim 5, characterized in that the formation of the weld seam (7) on the inner edge (25) takes place, so that a crimped seam is formed on the inside and an overlap seam is formed on the outside. 9. Gebinde (1) aus Blech mit mindestens zwei im wesentlichen parallel liegenden, am Umfang des Rumpfes (13) umlaufenden Ritzungen (15) und einer am Rumpf (13) zwischen den Ritzungen (15) angeordneten Aufreisszunge (11), dadurch ge­kennzeichnet, dass die Aufreisszunge (11) Teil des für die Herstellung des Rumpfes (13) zugeschnittenen Blechzuschnit­tes (17) ist, die über die Kante (18) des Blechzuschnittes (17) hinausragt und vor dem Schweissen der Zuschnittes (17) umgelegt worden ist, derart dass die Zunge (11) auf der Oberfläche des Zuschnittes (17) aufliegt.9. container (1) made of sheet metal with at least two substantially parallel, on the circumference of the fuselage (13) circumferential scoring (15) and a tear-open tongue (11) arranged on the fuselage (13) between the scoring (15), characterized in that that the tear-open tongue (11) is part of the sheet metal blank (17) cut for the manufacture of the fuselage (13), which protrudes beyond the edge (18) of the sheet metal blank (17) and has been folded over before welding the blank (17) that the tongue (11) rests on the surface of the blank (17). 10. Gebinde nach Anspruch 9, dadurch gekennzeichnet, dass die Schweissnaht (3) durch den Scheitel (25) der umgelegten Auf­reisslasche (11) verläuft.10. A container according to claim 9, characterized in that the weld seam (3) through the apex (25) of the folded tear tab (11). 11. Gebinde nach einem der Ansprüche 9 oder 10, dadurch gekenn­zeichnet, dass die Schweissnaht (3) in einem Abstand (x) zur aussenliegenden Kante (18) verläuft.11. Container according to one of claims 9 or 10, characterized in that the weld seam (3) at a distance (x) to the outer edge (18). 12. Gebinde nach Anspruch 11, dadurch gekennzeichnet, dass die Schweissnaht (3) auf der innenliegenden Kante (25) verläuft, und dass innen eine Quetschnaht und aussen eine Ueberlappt­naht vorliegt.12. Container according to claim 11, characterized in that the weld seam (3) runs on the inner edge (25), and that there is a pinch seam on the inside and an overlap seam on the outside.
EP87810181A 1986-04-12 1987-03-30 Method for making a welded seam Expired - Lifetime EP0243303B1 (en)

Applications Claiming Priority (2)

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

Publications (2)

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EP0243303A1 true EP0243303A1 (en) 1987-10-28
EP0243303B1 EP0243303B1 (en) 1990-11-07

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EP87810181A Expired - Lifetime EP0243303B1 (en) 1986-04-12 1987-03-30 Method for making a welded seam

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DE (1) DE3765987D1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0433235A1 (en) * 1989-12-11 1991-06-19 Siegfried Frei Method of forming scoring lines on tear strips and easy to open can ends as well as method of making a start fracture on a tear strip and a can made by this method
CN119175311A (en) * 2024-11-25 2024-12-24 长春汽车工业高等专科学校 A stamping forming equipment for automobile body parts

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE75622C (en) * J. ZlMMERMAN in 37'S Forest Avenue, Chicago, Tflinois, 'V. St. A An embodiment of the canning made known by patent specification No. 65207
US2339301A (en) * 1941-06-06 1944-01-18 American Can Co Container
DE1017042B (en) * 1955-10-21 1957-10-03 Continental Can Co Tin can with overlapped welded longitudinal seam and tear strips on the circumference of the fuselage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE75622C (en) * J. ZlMMERMAN in 37'S Forest Avenue, Chicago, Tflinois, 'V. St. A An embodiment of the canning made known by patent specification No. 65207
US2339301A (en) * 1941-06-06 1944-01-18 American Can Co Container
DE1017042B (en) * 1955-10-21 1957-10-03 Continental Can Co Tin can with overlapped welded longitudinal seam and tear strips on the circumference of the fuselage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0433235A1 (en) * 1989-12-11 1991-06-19 Siegfried Frei Method of forming scoring lines on tear strips and easy to open can ends as well as method of making a start fracture on a tear strip and a can made by this method
CN119175311A (en) * 2024-11-25 2024-12-24 长春汽车工业高等专科学校 A stamping forming equipment for automobile body parts

Also Published As

Publication number Publication date
DE3765987D1 (en) 1990-12-13
EP0243303B1 (en) 1990-11-07

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