EP0243303B1 - Method for making a welded seam - Google Patents

Method for making a welded seam Download PDF

Info

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
Other languages
German (de)
French (fr)
Other versions
EP0243303A1 (en
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
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 Individual filed Critical Individual
Publication of EP0243303A1 publication Critical patent/EP0243303A1/en
Application granted granted Critical
Publication of EP0243303B1 publication Critical patent/EP0243303B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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)

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. Nach dem Ausstanzen wird jeder Blechzuschnitt mittels eines Flügelpaares zu einem zylindrischen Rumpf gebogen, die zu verbindenden Kanten übereinandergelegt, in dieser Lage festgehalten bis das als Bindemittel aufgebrauchte Lötzinn erhärtet ist. Eine kontinuierliche Herstellung von Rümpfen im Durchlauf ist nicht möglich.For decades, 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.

Bei der Herstellung von geschweißten Dosen, die seit einigen Jahren immer mehr die gelöteten ver- . drängen, lassen sich die herkömmlich vorbereiteten Blechzuschnitte mit Aufreißzungen nicht verarbeiten, da die Blechzuschnitte beim Einlauf in die Schweißmaschine zu Zargen gerundet werden und anschließend deren zu verschweißende Längskanten von einer Führungsschneise erfaßt in eine gering gegenseitige Überlappung geführt werden, bevor die kontinuierliche Verschweißung mit einem Elektrodenrollenpaar erfolgt. Rümpfe, wie sie aus der DE-B- 1 017 042 bekannt sind, haben aus diesen Gründen nie Zugang zum Markt finden können.In the manufacture of welded cans, which have been increasingly soldered for several years. the conventionally prepared sheet metal blanks with tear-open tongues cannot be processed, since the sheet metal blanks are rounded to frames when they enter the welding machine and the longitudinal edges to be welded are then gripped by a guide groove in a slight mutual overlap before the continuous welding with a pair of electrode rollers he follows. Hulls as they are known from DE-B-1 017 042 have never been able to find access to the market for these reasons.

Es ist auch bekannt, separat hergestellte Zungen in aufwendigen, mehrere Schritte enthaltenden Arbeitsgängen vor dem Schweißen der Längsnaht auf den Rumpf aufzuschweißen. Die Schweißstelle, die in einem Abstand von fünf bis zehn Millimeter zur Schweißnaht liegt, muß anschließend in einem Arbeitsgang mindestens innen gegen Korrosion wieder geschützt werden.It is also known to weld separately manufactured tongues to the fuselage in complex, multi-step operations before welding the longitudinal seam. The weld, which is at a distance of five to ten millimeters from the weld, must then be protected against corrosion at least on the inside in one work step.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Herstellung eines geschweißten Gebindes mit einer Aufreißzunge zu schaffen, das die Nachteile der bekannten Verfahren 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 methods. 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 expenditure 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 in accordance with 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 Änderungen 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.The great advantage of the method according to the invention is that, on the one hand, 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. There is also no special painting at the tab. The new method can be carried out at the previous location of the welding machine without requiring additional space.

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 Öffnen mit dem Schlüssel auf Scherung belastet wird.Another advantage of the invention is that a fuselage can easily be provided with several pull 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 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.

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.Since 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.

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 running 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.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.

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 Figuren 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.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.

Die Herstellung der Zuschnitte 17 erfolgt in bekannter Weise 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.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.

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.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).

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.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.

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.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.

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 (vgl. auch Figur 4).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 (cf. also FIG. 4).

Die Kerbe 27 kann vor oder nach oder beim Umlegen der Aufreißzunge 11 angebracht werden. 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 t5 liegen. Statt der U-förmigen Kerbe 27 kann auch eine bogenförmige oder eine geradlinige, beispielsweise durch Scherung des Zuschnittes 17 erzeugte vorgesehen werden.The notch 27 can be made before or after or when the tongue 11 is flipped over. 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 at the side of the base of the tongue 11 and lie outside the scratches t5. 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.

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.Instead of the two scratches 15, several, e.g. three or four scratches 15 may be attached, two of which may be very close to each other.

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.After the production of the sheet metal blanks 17 with one or more tear-open tongues 11 and the flipping of the tongue 11 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.

Vorzugsweise wird der Schweißstrom im Bereich der Lasche vermindert, damit durch den erhöhten Druck der Schweißrollen keine Überhitzung der Schweißnaht erzeugt wird.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.

Die beiden Kanten 18 und 25 können als Quetschnaht oder als Überlapptnaht verschweißt werden. Wird eine Quetschnaht erzeugt, so muß der Scheitel 23 der Zunge 11 bündig zur Kante 18 liegen; wird eine Überlapptnaht 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.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.

An sich ist eine Anpassung der Flex- und Einrundwalzen an der Schweißnaht 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.In itself, it is not necessary to adapt the flex and single-round rolls on the weld seam 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.

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 inneren 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.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. 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. 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 explained in more detail below.

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 beaded and crimped 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.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.

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.Now he turns the key 31 in the direction of arrow A (Fig. 6 or 9), i.e. 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 when the seam is applied protection is also covered without additional measures.

Claims (12)

1. Method of producing a welded container (1) from a sheet metal blank (17), which has at least two indentations (15) extending parallel to each other and is provided. with a tear-open strip, which is situated between the two indentations (15) and protrudes at the end of the indentations (15) beyond an edge (18) of the sheet metal blank (17) to form a pull tab (11), the sheet metal blank (17) being rolled-up to form a substantially cylindrical body (13), and the overlapping longitudinal edges (25 and 18) being welded together, characterised in that
a) the pull tab (11) is bent-over on the flat blank (17) prior to the rolling-up process in such a manner that the pull tab (11) comes to lie sufficiently on the surface of the sheet metal blank (17) between the indentations (15), and
b) the sheet metal blank (17) is subsequently rolled in conventional manner to form a body (13) and welded in a rolled seam welding machine.
2. Method according to claim 1, characterised in that the fold (23), produced at the bending location of the tab (11) with the bending-over of the pull tab (11), is situated flush with, or at a spacing (x) from, the edge (18).
3. Method according to one of claims 1 and 2, characterised in that a groove (27) is provided between the two indentations (15) at a spacing from the edge (18) or (25).
4. Method according to claim 3, characterised in that the groove (27) extends parallel to the edge (18; 25), or it has an arcuate or U-shaped configuration.
5. Method according to claim 4, characterised in that the groove (27) is provided prior to, subsequently to or during the bending-over of the pull tab (11).
6. Method according to one of claims 1 to 5, characterised in that the welded seam (3), which joins together the two edges (18) and .(25) of the sheet metal blank (17), is provided over the fold (23) formed with the bending-over of the pull tab (11).
7. Method of producing a container according to one of claims 1 to 6, characterised in that the welded seam (3), which joins together the two overlapping edges (18) and (25) of the sheet metal blank (17), is provided at a spacing (x) from the outer edge (18).
8. Method according to claim 5, characterised in that the welded seam (7) is formed on the inner edge (25), so that a pinched seam is produced internally and an overlapped seam is produced externally.
9. Container (1) formed from sheet metal, comprising at least two indentations (15), which extend substantially parallel to each other, run around the circumference of the body (13) and form a tear-open strip therebetween, and a pull tab (11), which is part of the sheet metal blank (17) forming the body (13) and rests substantially on the body (13), characterised in that the pull tab (11) is bent through an angle of 180° in the region of the welded edge (18), to which it is joined, in such a manner that the pull tab (11) rests on the surface of the container (1) between the indentations (15).
10. Container according to claim 9, characterised in that the welded seam (3) extends through the fold (23) at the bending location of the bent-over pull tab (11).
11. Container according to claims 9 or 10, characterised in that the welded seam (3) extends at a spacing (x) from the outer edge (18).
12. Container according to claim 11, characterised in that the welded seam (3) extends along the inner edge (25), and a pinched seam is provided internally and an overlapped seam is provided externally.
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)

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

Family

ID=4210674

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87810181A Expired - Lifetime EP0243303B1 (en) 1986-04-12 1987-03-30 Method for making a welded seam

Country Status (2)

Country Link
EP (1) EP0243303B1 (en)
DE (1) DE3765987D1 (en)

Families Citing this family (1)

* 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

Family Cites Families (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

Also Published As

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

Similar Documents

Publication Publication Date Title
EP1863720B1 (en) Resoluble film packaging, in particular flow wrap packaging
EP0129102B1 (en) Opening arrangement for a lid
EP1791764B1 (en) Reclosable tubular bag and blank therefor
EP0952080A1 (en) Method and device for making filled drinking cups closed with a sealed cover sheet
DE19748842A1 (en) Process for producing a tape from sealing washer material and such a tape
EP0395949A1 (en) Package for liquids
DE3510105A1 (en) CONTAINER WITH A ZIPPER TAP FOR EASILY OPENING AND METHOD FOR THE PRODUCTION THEREOF
DE2759685C2 (en) Cardboard containers and cut-outs
DE3013515A1 (en) SACK, ESPECIALLY PAPER SACK, PRODUCTION MATERIAL THEREFOR, AND METHOD FOR PRODUCING SUCH A SACK
DE2649573A1 (en) CARTON CUTTING AND PROCESS FOR MANUFACTURING A PACKAGE FROM THIS CUTTING
DE2166378A1 (en) Process for the production of a ring-like pull tab from sheet metal for easy opening of a can front wall
DE3516388C2 (en)
DE2428355B2 (en) Process for filling and closing packaging containers and containers manufactured by the process
EP0209031B1 (en) Can, and method and membrane for its closure
AT397071B (en) CONTAINER CUTTING MADE OF FOLDABLE FLAT MATERIAL
EP0176052B1 (en) Container with a tearable part and method and apparatus for manufacturing the same
EP0243303B1 (en) Method for making a welded seam
DE4416231A1 (en) Continuous prodn. of a two-component metallic strip
DE4411925A1 (en) Method for covering a cut edge of an opening of a container with a protective cover
EP0197498B1 (en) Tearable container part
DE4102053C1 (en)
EP0325123B1 (en) Method of making a cylindrical metal container
EP0167855B1 (en) Tearable box body
WO2011045135A1 (en) Multi-layer sleeve
CH657824A5 (en) TORNABLE CAN PART.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19870401

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE ES FR GB IT LI NL SE

17Q First examination report despatched

Effective date: 19890110

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE ES FR GB IT LI NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19901107

Ref country code: NL

Effective date: 19901107

Ref country code: SE

Effective date: 19901107

Ref country code: GB

Effective date: 19901107

REF Corresponds to:

Ref document number: 3765987

Country of ref document: DE

Date of ref document: 19901213

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19910218

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19930310

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19930322

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19930329

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Effective date: 19940331

Ref country code: LI

Effective date: 19940331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19941130

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19941201

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST