EP0176052A2 - Container with a tearable part and method and apparatus for manufacturing the same - Google Patents

Container with a tearable part and method and apparatus for manufacturing the same Download PDF

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Publication number
EP0176052A2
EP0176052A2 EP85111945A EP85111945A EP0176052A2 EP 0176052 A2 EP0176052 A2 EP 0176052A2 EP 85111945 A EP85111945 A EP 85111945A EP 85111945 A EP85111945 A EP 85111945A EP 0176052 A2 EP0176052 A2 EP 0176052A2
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EP
European Patent Office
Prior art keywords
tab
welded
sheet metal
part according
thickening
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.)
Granted
Application number
EP85111945A
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German (de)
French (fr)
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EP0176052B1 (en
EP0176052A3 (en
Inventor
Paul Opprecht
Werner Urech
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.)
Elpatronic AG
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Elpatronic AG
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Filing date
Publication date
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Publication of EP0176052A2 publication Critical patent/EP0176052A2/en
Publication of EP0176052A3 publication Critical patent/EP0176052A3/en
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Publication of EP0176052B1 publication Critical patent/EP0176052B1/en
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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
    • 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
    • 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 tearable can part made of sheet metal with a pair of incisions which laterally delimit a tear strip, and a tab which is welded as a separate sheet metal part with one of its ends to the tear strip and extends in the longitudinal direction thereof.
  • a known can part (DE-C 1 017 042) the tab is punched out in one piece together with a flat sheet metal blank in the initial state and extends in its plane beyond one of two longitudinal edges of the sheet metal blank. Together with the two scoring that laterally delimit the tear strip, a starting scoring connecting the scoring together is stamped into the sheet metal blank in the area of the other longitudinal edge. The sheet metal blank is then rolled in such a way that the two longitudinal edges overlap one another, and these are then welded together to form a longitudinal seam, so that a cylindrical can body is formed. Finally, a complete can is produced from this, in that the two end faces of the can body are closed by crimping with a lid or a base. To open the can, a key is placed on the flap, which is then unrolled at the closest edge of the flange.
  • a can body In order to make the tearing process safer, a can body has been proposed in an older application, in which the flap is welded as a separate sheet metal part with one of its ends to the outer tear strips in the region of the longitudinal edge.
  • a starting score should preferably be arranged between the peripheral scores in the area of the inner longitudinal edge of the can body.
  • the invention is therefore based on the object of developing a can part of the type described at the outset, in particular a can body with longitudinal edges which are welded to one another or are to be welded, in such a way that the tearing process is facilitated without the manufacture or further processing of the can part being complicated or the Shelf life of the can is reduced until the intended opening.
  • the tab has at its welded end an edge folded over towards its other free end.
  • the tab and tear strip in the area in which they are welded to one another have a significantly higher rigidity than can be achieved by the previously proposed welding of a tab that has not been turned over.
  • the flap which has been folded over according to the invention and welded at its folded edge can be rolled up with a key just as easily as a conventional flap of the same width and sheet thickness.
  • a tear forms in the tear strip, which quickly and reliably reaches the two scratches and then follows them.
  • the invention is particularly suitable for use in a can part with two longitudinal edges which are welded together or are to be welded in an overlapping manner.
  • the tab is preferably welded on outside the overlap area of the longitudinal edges. This avoids any influence of the tab welding on the longitudinal seam welding. It has been found that the tab according to the invention can be welded on at any point on the tear strip and that no initial scoring is required; the positioning of the tab with respect to the can part with which it is to be welded is therefore possible with simple means and with little expenditure of time.
  • the edge of the tab is turned outwards, away from the sheet metal of the can part.
  • the tab according to the invention can be as smooth as one Place the flap that has not been folded over on the sheet metal of the can part so that the flap does not protrude from the can part, or at least does not interfere with it, and the risk is minimized that an unintentional perforation results from an impact on the flap.
  • the tab is rolled up in the intended manner with a key and the resulting wrap reaches the folded edge, a particularly strong concentration of force results in the tear strip below this edge, which considerably facilitates the desired occurrence of a tear.
  • the intended marking can be further facilitated in that the folded edge ends in an edge, from which at least a section extends obliquely to the circumferential scratches. It is advantageous if the folded edge is arrow-shaped. In particular, the folded edge advantageously has the shape of a rectangle and an adjoining isosceles triangle, the legs of which form the edge.
  • the tab On its side facing away from the folded edge, the tab preferably has a zone prepared for welding with a corrugated or waffle-like surface structure.
  • This zone preferably has a shape corresponding to the folded edge, in particular the shape of an arrow pointing towards the free end of the tab.
  • Can parts according to the invention can be produced by a method in which, in a known manner, a flat sheet metal blank provided with scoring is rolled into a cylinder with overlapping longitudinal edges are then welded together. This method is further developed according to the invention in that the tab is welded to the tear strip and the sheet metal blank is then rolled.
  • a device provided with a plurality of rollers for rolling the sheet metal blanks which is further developed according to the invention in that those rollers which are intended to act on the side of the sheet metal blank provided as the outside of the cylinder each have an annular groove whose Width and depth are slightly larger than the width or thickness of the welded-on tab including its folded edge.
  • a cylindrical can part 10 is shown, which consists for example of tinplate with a thickness of 0.2 mm.
  • the can part 10 has an outer longitudinal edge 12 and an inner longitudinal edge 14 as well as a pair of circumferential outer scratches 16 which extend at right angles to the longitudinal edges and delimit a tear strip 18 between them.
  • the tear strip 18 can have one or more further scratches running parallel to the scratches 16.
  • an elongated tab 20 is welded, which consists for example of tinplate with a thickness of 0.4 mm and in the longitudinal direction of the Tear strip 18 extends without reaching one of the longitudinal edges 12 or 14 of the can part 10.
  • the welded-on or welded-on end 22 has an edge 24 turned away from the can part 10 and extending towards the other end 26 which is still free after the tab 20 has been welded on.
  • the free end 26 is tapered in a trapezoidal shape to make it easier to insert a commercially available key for tearing open the can part 10.
  • the folded edge 24 of the flap 20 has a rectangular area which, according to FIGS. 2a and 2b, only takes up part of the length, whereas, according to FIGS .
  • a triangular area adjoins the rectangular area, so that the folded edge 24 is generally arrow-shaped.
  • the folded edge 24 ends with an outer edge 28, as seen from the can part 10, which, according to FIGS. 2a and 2b, points to the free end 26 in the form of an arrow, but runs transversely to the scratches 16 according to FIGS.
  • the tab 20 has on its side facing away from the folded-over edge 24 a zone 30 designed for welding to the tear strip 18 with a surface structure which is corrugated according to FIGS. 2a and 2c, but is preferably waffle-shaped according to FIGS. 2a and 2d so that it consists of a multitude of small, pyramid-shaped elevations.
  • a surface structure is intended to improve the current transfer and to avoid splashing of tin if the Tab 20 is welded to tear strip 18 by an electrical resistance spot welding process.
  • the part of the tab 20 intended for inserting a key and tapering towards the free end 26 is offset by a slight offset 32.
  • the tab 20 is only welded onto the tear strip 18 by means of two welding electrodes 34 and 36 when the two longitudinal edges 12 and 14 have already been welded in an overlapping manner in the usual manner.
  • FIG. 3 shows a stack of even flat, rectangular sheet metal blanks 38, each with a welded-on tab 20.
  • the stack is guided between vertical guides 40, each of which only releases the lowermost sheet metal blank 38, so that it can be inserted away from the stack between rollers 42 and 44 arranged in pairs, which roll a cylindrical can part 10 from each flat sheet metal blank 38.
  • that roller 42 which acts on the outside of the cylindrical can part 10 which is formed, has an annular groove 46 which is arranged and dimensioned such that it allows the tab 20 to pass unimpeded and smoothly.
  • a rail 48 begins, around which each sheet metal blank 38 is rolled and along which it is then moved axially as a cylindrical can part 10.
  • the rail 48 has guide edges 50 and 52 which guide the longitudinal edges 12 and 14 of the can part 10 in such a way that they approach each other and eventually overlap in order to form an overlap seam by means of electrical resistance roller seam welding; in this regard, reference is made, for example, to DE-C 2 559 671.
  • FIG. 2e shows a variant of the tab 20 which is particularly advantageous in terms of construction and production technology.
  • the edge does not have to be turned over, because here one assumes a thicker base plate thickness and punches the corresponding tapers by rolling or embossing, only the desired thickening 24 remaining.
  • the honeycomb or waffle pattern is then again attached to this thickening, specifically in the arrow-shaped form, as indicated by the way in FIGS. 2a and 2b.

Abstract

Ein aufreissbares Dosenteil (10) aus Blech hat ein paar Ritzungen (16), die einen Aufreisstreifen (18) seitlich begrenzen. An den Aufreisstreifen (18) ist eine Lasche (20) angeschweisst, die an ihrem angeschweissten Ende (22) eine Verdickung (24) aufweist. Diese ist von einem zu dem anderen freien Ende (26) der Lasche (20) umgeschlagenen Rand gebildet.A tearable tin part (10) made of sheet metal has a few scratches (16) which laterally delimit a tear strip (18). A tab (20) is welded to the tear strip (18) and has a thickened portion (24) at its welded end (22). This is formed by an edge folded over to the other free end (26) of the tab (20).

Description

Die Erfindung betrifft ein aufreißbares Dosenteil aus Blech mit einem Paar Ritzungen, die einen Aufreißstreifen seitlich begrenzen, und einer Lasche, die als gesondertes Blechteil mit einem ihrer Enden an den Aufreißstreifen angeschweißt ist und sich in dessen Längsrichtung erstreckt.The invention relates to a tearable can part made of sheet metal with a pair of incisions which laterally delimit a tear strip, and a tab which is welded as a separate sheet metal part with one of its ends to the tear strip and extends in the longitudinal direction thereof.

Bei einem bekannten Dosenteil (DE-C 1 017 042) ist die Lasche zusammen mit einem im Ausgangszustand ebenen Blechzuschnitt in einem Stück ausgestanzt und erstreckt sich in dessen Ebene über einen von zwei Längsrändern des Blechzuschnittes hinaus. Zusammen mit den beiden Ritzungen, die den Aufreißstreifen seitlich begrenzen, ist eine die Ritzungen miteinander verbindende Startritzung im Bereich des anderen Längsrandes in den Blechzuschnitt eingestanzt. Der Blechzuschnitt wird dann derart gerollt, daß die beiden Längsränder einander überlappen, und diese werden anschließend miteinander zu einer Längsnaht verschweißt, so daß ein zylindrischer Dosenrumpf entsteht. Aus diesem wird schließlich eine vollständige Dose hergestellt, indem die beiden Stirnseiten des Dosenrumpfes durch Bördeln mit einem Deckel bzw. einem Boden verschlossen werden. Zum Aufreißen der Dose wird auf die Lasche ein Schlüssel aufgesteckt, der am nächstgelegenen Bördelrand abgerollt wird.In a known can part (DE-C 1 017 042) the tab is punched out in one piece together with a flat sheet metal blank in the initial state and extends in its plane beyond one of two longitudinal edges of the sheet metal blank. Together with the two scoring that laterally delimit the tear strip, a starting scoring connecting the scoring together is stamped into the sheet metal blank in the area of the other longitudinal edge. The sheet metal blank is then rolled in such a way that the two longitudinal edges overlap one another, and these are then welded together to form a longitudinal seam, so that a cylindrical can body is formed. Finally, a complete can is produced from this, in that the two end faces of the can body are closed by crimping with a lid or a base. To open the can, a key is placed on the flap, which is then unrolled at the closest edge of the flange.

Bei diesen bekannten Dosen gelingt es vor allem ungeübten Verbrauchern nicht immer auf Anhieb, den Aufreißstreifen in der gewünschten Weise vollständig zu entfernen. Nicht selten reißt der Aufreißstreifen schon im Bereich der Längsränder oder kurz dahinter ab, weil sich von der Lasche ausgehend konvergierende Risse bilden, die sich zwischen den Umfangsritzungen treffen. Der Verbraucher ist dann gezwungen, das öffnen der Dose mit einem für diesen Zweck nicht vorgesehenen Werkzeug fortzusetzen, wobei die Gefahr besteht, daß er sich an scharfen Blechrändern verletzt.In the case of these known cans, inexperienced consumers in particular are not always able to remove the tear strip completely in the desired manner. It is not uncommon for the tear strip to tear off in the area of the longitudinal edges or shortly behind, because converging cracks form from the tab and meet between the circumferential scratches. The consumer is then forced to continue opening the can with a tool not provided for this purpose, with the risk of being injured on sharp sheet metal edges.

In der Absicht, den Aufreißvorgang sicherer zu gestalten, ist in einer älteren Anmeldung ein Dosenrumpf vorgeschlagen worden, bei dem die Lasche als gesondertes Blechteil mit einem ihrer Enden an den£äußereßAufreiBstreifen im Bereich des Längsrandes angeschweißt ist. Dabei soll vorzugsweise im Bereich des inneren Längsrandes des Dosenrumpfes eine Startritzung zwischen den Umfangsritzungen angeordnet sein. Es hat sich jedoch als sehr schwierig erwiesen, in den kurzen Taktzeiten von Bruchteilen einer Sekunde, die bei einer industriellen Dosenproduktion eingehalten werden müssen, die Lasche so genau am äußeren Längsrand und mit derart genau dosiertem Schweißstrom anzuschweißen, daß der Aufreißvorgang in der erstrebten Weise erleichtert, die Güte der Längsnaht aber nicht vermindert wird.In order to make the tearing process safer, a can body has been proposed in an older application, in which the flap is welded as a separate sheet metal part with one of its ends to the outer tear strips in the region of the longitudinal edge. A starting score should preferably be arranged between the peripheral scores in the area of the inner longitudinal edge of the can body. However, it has proven to be very difficult to weld the tab so precisely on the outer longitudinal edge and with such precisely metered welding current in the short cycle times of fractions of a second that must be observed in industrial can production that the tearing process in the desired manner facilitates , but the quality of the longitudinal seam is not reduced.

Der Erfindung liegt deshalb die Aufgabe zugrunde, ein Dosenteil der eingangs beschriebenen Gattung, insbesondere einen Dosenrumpf mit Längsrändern, die miteinander verschweißt sind oder verschweißt werden sollen, derart weiterzubilden, daß der Aufreißvorgang erleichtert wird, ohne daß die Herstellung oder Weiterverarbeitung des Dosenteils erschwert oder die Haltbarkeit der Dose bis zum beabsichtigten Aufreißen vermindert wird.The invention is therefore based on the object of developing a can part of the type described at the outset, in particular a can body with longitudinal edges which are welded to one another or are to be welded, in such a way that the tearing process is facilitated without the manufacture or further processing of the can part being complicated or the Shelf life of the can is reduced until the intended opening.

Die Aufgabe ist erfindungsgemäß dadurch gelöst, daß die Lasche an ihrem angeschweißten Ende einen in Richtung zu ihrem anderen, freien Ende umgeschlagenen Rand aufweist.The object is achieved in that the tab has at its welded end an edge folded over towards its other free end.

Dadurch erhalten Lasche und Aufreißstreifen in dem Bereich, in dem sie miteinander verschweißt sind, eine bedeutend höhere Steifigkeit als sie durch das bisher vorgeschlagene Anschweißen einer nicht umgeschlagenen Lasche erzielbar ist. Die erfindungsgemäß umgeschlagene und an ihrem umgeschlagenen Rand verschweißte Lasche läßt sich mit einem Schlüssel ebenso leicht aufrollen wie eine gewöhnliche Lasche gleicher Breite und Blechdicke. Sobald aber der beim Aufrollen der Lasche entstehende Wickel den durch den umgeschlagenen und verschweißten Rand versteiften Abschnitt erreicht, bildet sich im Aufreißstreifen ein Anriß, der die beiden Ritzungen rasch und zuverlässig erreicht und diesen dann folgt.As a result, the tab and tear strip in the area in which they are welded to one another have a significantly higher rigidity than can be achieved by the previously proposed welding of a tab that has not been turned over. The flap which has been folded over according to the invention and welded at its folded edge can be rolled up with a key just as easily as a conventional flap of the same width and sheet thickness. However, as soon as the wrap created when the tab is rolled up reaches the section stiffened by the folded and welded edge, a tear forms in the tear strip, which quickly and reliably reaches the two scratches and then follows them.

Die Erfindung eignet sich besonders zur Anwendung bei einem Dosenteil mit zwei Längsrändern, die überlappend miteinander verschweißt sind oder verschweißt werden sollen. In diesem Fall ist die Lasche vorzugsweise außerhalb des überlappungsbereichs der Längsränder angeschweißt. Dadurch wird jeglicher Einfluß der Laschenschweißung auf die Längsnahtschweißung vermieden. Es hat sich herausgestellt, daß die erfindungsgemäße Lasche an beliebiger Stelle des Aufreißstreifens angeschweißt werden kann und keinerlei Startritzung erforderlich ist; das Positionieren der Lasche in bezug auf das Dosenteil, mit dem sie verschweißt werden soll, ist deshalb mit einfachen Mitteln und geringem Zeitaufwand möglich.The invention is particularly suitable for use in a can part with two longitudinal edges which are welded together or are to be welded in an overlapping manner. In this case, the tab is preferably welded on outside the overlap area of the longitudinal edges. This avoids any influence of the tab welding on the longitudinal seam welding. It has been found that the tab according to the invention can be welded on at any point on the tear strip and that no initial scoring is required; the positioning of the tab with respect to the can part with which it is to be welded is therefore possible with simple means and with little expenditure of time.

Besonders vorteilhaft ist es, wenn der Rand der Lasche nach außen, vom Blech des Dosenteils weg, umgeschlagen ist. Bei dieser Anordnung des umgeschlagenen Randes läßt sich die erfindungsgemäße Lasche ebenso glatt wie eine nicht umgeschlagene Lasche an das Blech des Dosenteils anlegen, so daß die Lasche nicht, oder jedenfalls nicht störend, vom Dosenteil absteht und außerdem die Gefahr äußerst gering gehalten wird, daß durch einen Stoß auf die Lasche eine unbeabsichtigte Perforation entsteht. Wenn aber die Lasche in der beabsichtigten Weise mit einem Schlüssel aufgerollt wird und der dabei entstehende Wickel den umgeschlagenen Rand erreicht, ergibt sich im Aufreißstreifen unterhalb dieses Randes eine besonders starke Kraftkonzentration, welche die gewünschte Entstehung eines Anrisses wesentlich erleichtert.It is particularly advantageous if the edge of the tab is turned outwards, away from the sheet metal of the can part. With this arrangement of the folded edge, the tab according to the invention can be as smooth as one Place the flap that has not been folded over on the sheet metal of the can part so that the flap does not protrude from the can part, or at least does not interfere with it, and the risk is minimized that an unintentional perforation results from an impact on the flap. However, if the tab is rolled up in the intended manner with a key and the resulting wrap reaches the folded edge, a particularly strong concentration of force results in the tear strip below this edge, which considerably facilitates the desired occurrence of a tear.

Das beabsichtigte Anreißen läßt sich noch weiter dadurch erleichtern, daß der umgeschlagene Rand in einer Randkante endet, von der sich mindestens ein Abschnitt schräg zu den Umfangsritzungen erstreckt. Es ist vorteilhaft, wenn der umgeschlagene Rand pfeilförmig ist. Insbesondere hat der umgeschlagene Rand zweckmäßigerweise die Form eines Rechtecks und eines sich daran anschließenden gleichschenkligen Dreiecks, dessen Schenkel die Randkante bilden.The intended marking can be further facilitated in that the folded edge ends in an edge, from which at least a section extends obliquely to the circumferential scratches. It is advantageous if the folded edge is arrow-shaped. In particular, the folded edge advantageously has the shape of a rectangle and an adjoining isosceles triangle, the legs of which form the edge.

Die Lasche hat an ihrer vom umgeschlagenen Rand abgewandten Seite vorzugsweise eine zum Anschweißen vorbereitete Zone mit geriffelter oder waffelartiger Oberflächenstruktur. Diese Zone hat vorzugsweise eine dem umgeschlagenen Rand entsprechende Form, insbesondere die Form eines zum freien Ende der Lasche weisenden Pfeils.On its side facing away from the folded edge, the tab preferably has a zone prepared for welding with a corrugated or waffle-like surface structure. This zone preferably has a shape corresponding to the folded edge, in particular the shape of an arrow pointing towards the free end of the tab.

Erfindungsgemäße Dosenteile lassen sich nach einem Verfahren herstellen, bei dem in bekannter Weise ein mit Ritzungen versehener ebener Blechzuschnitt zu einem Zylinder mit überlappenden Längsrändern gerollt wird, die anschließend miteinander verschweißt werden. Dieses Verfahren wird erfindungsgemäß dadurch weitergebildet, daß die Lasche an den Aufreißstreifen angeschweißt wird und der Blechzuschnitt erst anschließend gerollt wird.Can parts according to the invention can be produced by a method in which, in a known manner, a flat sheet metal blank provided with scoring is rolled into a cylinder with overlapping longitudinal edges are then welded together. This method is further developed according to the invention in that the tab is welded to the tear strip and the sheet metal blank is then rolled.

Zum Durchführen dieses Verfahren verwendet man zweckmäßigerweise eine mit mehreren Walzen zum Rollen der Blechzuschnitte versehene Vorrichtung, die erfindungsgemäß dadurch weitergebildet ist, daß diejenigen Walzen, die zur Einwirkung auf die als Außenseite des Zylinders vorgesehene Seite des Blechzuschnitts bestimmt sind, je eine Ringnut aufweisen, deren Breite und Tiefe etwas größer sind als die Breite bzw. Dicke der aufgeschweißten Lasche samt deren umgeschlagenem Rand.To carry out this method, it is expedient to use a device provided with a plurality of rollers for rolling the sheet metal blanks, which is further developed according to the invention in that those rollers which are intended to act on the side of the sheet metal blank provided as the outside of the cylinder each have an annular groove whose Width and depth are slightly larger than the width or thickness of the welded-on tab including its folded edge.

Ausführungsbeispiele der Erfindung werden im folgenden anhand schematischer Zeichnungen mit weiteren Einzelheiten erläutert. Es zeigen, jeweils in Schrägansicht:

  • Fig.1 ein aufreißbares Dosenteil mit angeschweißter Lasche,
  • Fig.2a-2e verschiedene Ausführungsformen der Lasche vor dem Anschweißen und
  • Fig.3 eine Vorrichtung zum Rollen von Dosenteilen gemäß Fig.l.
Exemplary embodiments of the invention are explained in more detail below with the aid of schematic drawings. They show, each in an oblique view:
  • 1 a tearable can part with welded-on tab,
  • Fig.2a-2e different embodiments of the tab before welding and
  • 3 shows a device for rolling can parts according to Fig.l.

In Fig.l ist ein zylindrisches Dosenteil 10 dargestellt, das beispielsweise aus Weißblech mit einer Dicke von 0,2 mm besteht. Das Dosenteil 10 hat einen äußeren Längsrand 12 und einen inneren Längsrand 14 sowie ein Paar in Umfangsrichtung verlaufender äußerer Ritzungen 16, die sich im rechten Winkel zu den Längsrändern erstrecken und zwischen sich einen Aufreißstreifen 18 begrenzen. Der Aufreißstreifen 18 kann eine oder mehrere weitere, parallel zu den Ritzungen 16 verlaufende Ritzungen aufweisen. An den Aufreißstreifen 18 ist eine längliche Lasche 20 angeschweißt, die beispielsweise aus Weißblech mit einer Dicke von 0,4mm besteht und sich in Längsrichtung des Aufreißstreifens 18 erstreckt, ohne einen der Längsränder 12 oder 14 des Dosenteils 10 zu erreichen.In Fig.l a cylindrical can part 10 is shown, which consists for example of tinplate with a thickness of 0.2 mm. The can part 10 has an outer longitudinal edge 12 and an inner longitudinal edge 14 as well as a pair of circumferential outer scratches 16 which extend at right angles to the longitudinal edges and delimit a tear strip 18 between them. The tear strip 18 can have one or more further scratches running parallel to the scratches 16. On the tear strip 18, an elongated tab 20 is welded, which consists for example of tinplate with a thickness of 0.4 mm and in the longitudinal direction of the Tear strip 18 extends without reaching one of the longitudinal edges 12 or 14 of the can part 10.

Die Lasche 20, die in Fig.2a-2d in mehreren Varianten einzeln dargestellt ist, wird nur im Bereich eines Endes 22 angeschweißt, das vom inneren Längsrand 14 einen mit der Breite des Aufreißstreifens 18 annähernd übereinstimmenden Abstand hat. Das angeschweißte oder anzuschweißende Ende 22 weist einen nach außen, vom Dosenteil 10 weg, umgeschlagenen Rand 24 auf, der sich in Richtung zum anderen, nach dem Anschweißen der Lasche 20 noch freien Ende 26 erstreckt. Das freie Ende 26 ist trapezförmig verjüngt, um das Aufstecken eines handelsüblichen Schlüssels zum Aufreißen des Dosenteils 10 zu erleichtern.The flap 20, which is shown individually in several variants in FIGS. 2a-2d, is only welded on in the region of an end 22 which is at a distance from the inner longitudinal edge 14 which approximately corresponds to the width of the tear strip 18. The welded-on or welded-on end 22 has an edge 24 turned away from the can part 10 and extending towards the other end 26 which is still free after the tab 20 has been welded on. The free end 26 is tapered in a trapezoidal shape to make it easier to insert a commercially available key for tearing open the can part 10.

Der umgeschlagene Rand 24 der Lasche 20 hat bei allen in Fig.2a-2d dargestellten Beispielen einen rechteckigen Bereich, der gemäß Fig.2a und 2b nur einen Teil der Länge, gemäß Fig.2c und 2d hingegen die gesamte Länge des umgeschlagenen Randes 24 einnimmt. Gemäß Fig.2a und 2b schließt sich an den rechteckigen Bereich ein dreieckiger Bereich an, so daß der umgeschlagene Rand 24 insgesamt pfeilförmig ist. In jedem Fall endet der umgeschlagene Rand 24 mit einer vom Dosenteil 10 aus gesehen außenliegenden Randkante 28, die gemäß Fig.2a und 2b pfeilförmig zum freien Ende 26 hinweist, gemäß Fig.2c und 2d hingegen quer zu den Ritzungen 16 verläuft.In all the examples shown in FIGS. 2a-2d, the folded edge 24 of the flap 20 has a rectangular area which, according to FIGS. 2a and 2b, only takes up part of the length, whereas, according to FIGS . According to FIGS. 2a and 2b, a triangular area adjoins the rectangular area, so that the folded edge 24 is generally arrow-shaped. In any case, the folded edge 24 ends with an outer edge 28, as seen from the can part 10, which, according to FIGS. 2a and 2b, points to the free end 26 in the form of an arrow, but runs transversely to the scratches 16 according to FIGS.

Die Lasche 20 hat in allen abgebildeten Varianten an ihrer vom umgeschlagenen Rand 24 abgewandten Seite eine zum Anschweißen an den Aufreißstreifen 18 ausgebildete Zone 30 mit einer Oberflächenstruktur, die gemäß Fig.2a und 2c geriffelt ist, jedoch vorzugsweise gemäß Fig.2b und 2d waffelförmig ist, so daß sie aus einer Vielzahl kleiner, pyramidenförmiger Erhebungen besteht. Durch eine solche Oberflächenstruktur soll der Stromübergang verbessert und Verspritzen von Zinn vermieden werden, wenn die Lasche 20 nach einem elektrischen Widerstands-Punktschweißverfahren an den Aufreißstreifen-18 angeschweißt wird. Gegenüber der Zone 30 ist der zum Aufstecken eines Schlüssels bestimmte, sich zum freien Ende 26 verjüngende Teil der Lasche 20 durch eine leichte Kröpfung 32 abgesetzt.In all of the variants shown, the tab 20 has on its side facing away from the folded-over edge 24 a zone 30 designed for welding to the tear strip 18 with a surface structure which is corrugated according to FIGS. 2a and 2c, but is preferably waffle-shaped according to FIGS. 2a and 2d so that it consists of a multitude of small, pyramid-shaped elevations. Such a surface structure is intended to improve the current transfer and to avoid splashing of tin if the Tab 20 is welded to tear strip 18 by an electrical resistance spot welding process. Compared to the zone 30, the part of the tab 20 intended for inserting a key and tapering towards the free end 26 is offset by a slight offset 32.

Gemäß Fig.1 wird die Lasche 20 mittels zweier Schweißelektroden 34 und 36 erst dann auf den Aufreißstreifen 18 aufgeschweißt, wenn die beiden Längsränder 12 und 14 schon in der üblichen Weise einander überlappend verschweißt sind.According to FIG. 1, the tab 20 is only welded onto the tear strip 18 by means of two welding electrodes 34 and 36 when the two longitudinal edges 12 and 14 have already been welded in an overlapping manner in the usual manner.

In Fig.3 ist hingegen ein Stapel noch ebener, rechteckiger Blechzuschnitte 38 mit je einer aufgeschweißten Lasche 20 dargestellt. Der Stapel ist zwischen senkrechten Führungen 40 geführt, die jeweils nur den untersten Blechzuschnitt 38 freigeben, so daß dieser vom Stapel weg zwischen paarweise angeordnete Walzen 42 und 44 eingeführt werden kann, die aus jedem ebenen Blechzuschnitt 38 ein zylindrisches Dosenteil 10 rollen. In jedem Walzenpaar hat diejenige Walze 42, die auf die Außenseite des entstehenden zylindrischen Dosenteils 10 einwirkt, eine Ringnut 46, die so angeordnet und bemessen ist, daß sie die Lasche 20 unbehindert und stoßfrei hindurchlaufen läßt.3, on the other hand, shows a stack of even flat, rectangular sheet metal blanks 38, each with a welded-on tab 20. The stack is guided between vertical guides 40, each of which only releases the lowermost sheet metal blank 38, so that it can be inserted away from the stack between rollers 42 and 44 arranged in pairs, which roll a cylindrical can part 10 from each flat sheet metal blank 38. In each pair of rollers, that roller 42, which acts on the outside of the cylindrical can part 10 which is formed, has an annular groove 46 which is arranged and dimensioned such that it allows the tab 20 to pass unimpeded and smoothly.

An dem letzten dargestellten Paar Walzen 42, 44 beginnt eine Schiene 48, um die jeder Blechzuschnitt 38 herumgerollt und längs der er dann als zylindrisches Dosenteil 10 axial weiterbewegt wird. Die Schiene 48 hat Führungskanten 50 und 52, welche die Längsränder 12 und 14 des Dosenteils 10 derart führen, daß sie sich einander nähern und schließlich überlappen, um durch elektrische Widerstands-Rollenahtschweißung eine Uberlappnaht zu bilden; hierzu wird beispielsweise auf die DE-C 2 559 671 verwiesen.On the last pair of rollers 42, 44 shown, a rail 48 begins, around which each sheet metal blank 38 is rolled and along which it is then moved axially as a cylindrical can part 10. The rail 48 has guide edges 50 and 52 which guide the longitudinal edges 12 and 14 of the can part 10 in such a way that they approach each other and eventually overlap in order to form an overlap seam by means of electrical resistance roller seam welding; in this regard, reference is made, for example, to DE-C 2 559 671.

In Figur 2e ist eine besonders konstruktiv und herstellungstechnisch vorteilhafte Variante der Lasche 20 dargestellt. Bei dieser Lasche entfällt das Umschlagen des Randes, denn hier geht man von einer dickeren Grundblechstärke aus und stanzt die entsprechenden Verjüngungen durch Rollen oder Prägen wobei lediglich die gewünschte Verdickung 24 stehenbleibt. Auf dieser Verdickung wird dann wieder das Waben- oder Waffelmuster angebracht und zwar in der pfeilförmigen Form, wie übrigens in den Figuren 2a und 2b angedeutet. Durch diese Operationen kann dann die relativ arbeitsaufwendige Manipulation des Umschlagens des freien Endes entfallen und zusätzlich wird durch die Stanzarbeit eine wesentliche Härtung des Grundmaterials erreicht, d.h. die Lasche ist nun wesentlich härter als wäre sie aus einem normalen Blechstreifen gestanzt.FIG. 2e shows a variant of the tab 20 which is particularly advantageous in terms of construction and production technology. With this flap, the edge does not have to be turned over, because here one assumes a thicker base plate thickness and punches the corresponding tapers by rolling or embossing, only the desired thickening 24 remaining. The honeycomb or waffle pattern is then again attached to this thickening, specifically in the arrow-shaped form, as indicated by the way in FIGS. 2a and 2b. Through these operations, the relatively labor-intensive manipulation of the turning over of the free end can be dispensed with and, in addition, the stamping work achieves a substantial hardening of the base material, i.e. the tab is now much harder than if it had been punched out of a normal metal strip.

Claims (12)

1. Aufreissbares Dosenteil aus Blech mit einem Paar Ritzungen (16), die einen Aufreissstreifen (18) seitlich begrenzen, und einer Lasche (20), die als gesondertes Blechteil mit einem ihrer Enden an den Aufreissstreifen (18) angeschweisst ist und sich in dessen Längsrichtung erstreckt, dadurch gekennzeichnet , dass die Lasche (20) an ihrem angeschweissten Ende (22) eine Verdickung (24) aufweist.1. tear-open can part made of sheet metal with a pair of scratches (16) which laterally delimit a tear strip (18), and a tab (20) which is welded as a separate sheet metal part with one of its ends to the tear strip (18) and in it Longitudinal direction, characterized in that the tab (20) has a thickened portion (24) at its welded end (22). 2. Dosenteil nach Anspruch 1, mit zwei Längsrändern (12, 14), die überlappend miteinander verschweisst sind oder werden sollen, dadurch gekennzeichnet , dass die Lasche (20) ausserhalb des Ueberlappungsbereichs der Längsränder (12, 14) angeschweisst ist.2. Can part according to claim 1, with two longitudinal edges (12, 14) which are welded or are to be overlapped, characterized in that the tab (20) is welded outside the overlap area of the longitudinal edges (12, 14). 3. Dosenteil nach Anspruch 1 oder 2 dadurch gekennzeichnet, dass die Verdickung (24) zumindest annähernd der ursprünglichen Dicke des zur Herstellung der Lasche (20) verwendeten Blechteils entspricht, das im übrigen durch Stanzen, Prägen oder Rollen dünner gemacht ist.3. Can part according to claim 1 or 2, characterized in that the thickening (24) corresponds at least approximately to the original thickness of the sheet metal part used for producing the tab (20), which is otherwise made thinner by stamping, embossing or rolling. 4. Dosenteil nach Anspruch 1 oder 2,- dadurch gekennzeichnet, dass die Verdickung (24) vorn von einem in Richtung zu dem anderen freien Ende (26), deren Lasche (20) umgeschlagenen Rand gebildet ist.4. Can part according to claim 1 or 2, - characterized in that the thickening (24) at the front of one in the direction of the other free end (26), the tab (20) folded edge is formed. 5. Dosenteil nach einem der Ansprüche 1 bis 4, ddadurch gekennzeichnet, dass die Verdickung (24) nach aussen vorspringt.5. Can part according to one of claims 1 to 4, characterized in that the thickening (24) protrudes outwards. 6. Dosenteil nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Verdickung (24) in einer Randkante (28) endet, von der sich mindestens ein Abschnitt schräg zu den Ritzungen (16) erstreckt.6. Can part according to one of claims 1 to 5, characterized in that the thickening (24) ends in an edge (28), at least a portion of which extends obliquely to the scratches (16). 7. Dosenteil nach Anspruch 6, dadurch gekennzeichnet, dass die Verdickung (24) pfeilförmig ist.7. Can part according to claim 6, characterized in that the thickening (24) is arrow-shaped. 8. Dosenteil nach Anspruch 7, dadurch gekennzeichnet , dass die Verdickung (24) die Form eines Recktecks und eines sich daran anschliessenden gleichschenkligen Dreiecks hat, dessen Schenkel die Randkante (28) bilden.8. Can part according to claim 7, characterized in that the thickening (24) has the shape of a rectangle and an adjoining isosceles triangle, the legs of which form the edge (28). 9. Dosenteil nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet , dass die Lasche (20) eine zum Anschweissen vorbereitete Zone (30) mit geriffelter oder waffelartiger Oberflächenstruktur hat.9. Can part according to one of claims 1 to 8, characterized in that the tab (20) has a prepared for welding zone (30) with a corrugated or waffle-like surface structure. 10. Dosenteil nach Anspruch 9, dadurch gekennzeichnet, dass die genannte Zone (30) eine der Verdickung (24) entsprechende Form, insbesondere die Form eines zum freien Ende (26) der Lasche (20) weisenden Pfeils hat.10. Can part according to claim 9, characterized in that said zone (30) has a shape corresponding to the thickening (24), in particular the shape of a free one End (26) of the tab (20) pointing arrow. 11. Verfahren zum Herstellen eines Dosenteils nach einem der Ansprüche 1 bis 10, bei dem ein mit Ritzungen (16) versehener ebener Blechzuschnitt (38) zu einem Zylinder mit überlappenden Längsrändern (12, 14) gerollt wird, die anschliessend miteinander verschweisst werden, dadurch gekennzeichnet , dass die Lasche (20) an den Aufreissstreifen (18) angeschweisst wird und der Blechzuschnitt (38) erst anschliessend gerollt wird.11. A method for producing a can part according to one of claims 1 to 10, in which a flat sheet metal blank (38) provided with scratches (16) is rolled into a cylinder with overlapping longitudinal edges (12, 14) which are then welded to one another, thereby characterized in that the tab (20) is welded to the tear strip (18) and the sheet metal blank (38) is only rolled afterwards. 12. Vorrichtung zum Durchführen des Verfahrens nach Anspruch 11, mit mehreren Walzen (42, 44) zum Rollen der Blechzuschnitte (38), dadurch gekennzeichnet , dass diejenigen Walzen (42), die zur Einwirkung auf die als Aussenseite des Zylinders vorgesehene Seite des Blechzuschnitts (38) bestimmt sind, je eine Ringnut (46) aufweisen, deren Breite und Tiefe etwas grösser sind als die Breite bzw. Dicke der aufgeschweissten Lasche (20) samt deren Verdickung (24).12. The apparatus for performing the method according to claim 11, with a plurality of rollers (42, 44) for rolling the sheet metal blanks (38), characterized in that those rollers (42) which act on the side of the sheet metal blank provided as the outside of the cylinder (38), each have an annular groove (46), the width and depth of which are somewhat greater than the width or thickness of the welded-on tab (20) including its thickening (24).
EP85111945A 1984-09-25 1985-09-20 Container with a tearable part and method and apparatus for manufacturing the same Expired EP0176052B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4582/84A CH682906A5 (en) 1984-09-25 1984-09-25 Openable can member and method and apparatus for its production.
CH4582/84 1984-09-25

Publications (3)

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EP0176052A2 true EP0176052A2 (en) 1986-04-02
EP0176052A3 EP0176052A3 (en) 1987-11-11
EP0176052B1 EP0176052B1 (en) 1989-12-13

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EP85111945A Expired EP0176052B1 (en) 1984-09-25 1985-09-20 Container with a tearable part and method and apparatus for manufacturing the same

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US (3) US4662534A (en)
EP (1) EP0176052B1 (en)
JP (1) JPS61123434A (en)
BR (1) BR8504714A (en)
CH (1) CH682906A5 (en)
DE (2) DE3515812A1 (en)
ES (2) ES8608354A1 (en)
FI (1) FI79273C (en)
FR (1) FR2570679B1 (en)
GB (1) GB2165205B (en)

Cited By (1)

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EP0197498A2 (en) * 1985-04-09 1986-10-15 Elpatronic Ag Tearable container part

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CH678501A5 (en) * 1989-05-16 1991-09-30 Elpatronic Ag
US5209625A (en) * 1989-08-22 1993-05-11 Elpatronic Ag Apparatus for rounding and conveying onwards sheet-metal blanks for can bodies
CH680714A5 (en) * 1989-08-22 1992-10-30 Elpatronic Ag
DE10333581A1 (en) * 2003-07-24 2005-02-24 Hofbräuhaus Traunstein Josef Sailer KG Glass vessel for carbonated drinks consists of circumferential wall has filling opening closed off by lid which has circumferential wall which engages with edge section of vessel's circumferential wall
US20100251798A1 (en) * 2009-04-06 2010-10-07 The Coca-Cola Company Method of Manufacturing a Metal Vessel
CN101767672B (en) * 2009-12-28 2012-01-11 吴江市华源印铁制罐有限责任公司 De-coil type easily opened and closed can and skip welding-soldering combined technique for processing same
JP7027122B2 (en) * 2017-10-27 2022-03-01 シロキ工業株式会社 How to seam weld vehicle door sashes

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FR2304434A1 (en) * 1975-03-19 1976-10-15 Paul Opprecht ELECTRICAL WELDING PROCESS AND RESISTANCE WELDING MACHINE FOR IMPLEMENTING THE PROCESS
EP0167855A2 (en) * 1984-07-12 1986-01-15 Elpatronic Ag Tearable box body
EP0197498A2 (en) * 1985-04-09 1986-10-15 Elpatronic Ag Tearable container part

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US2753075A (en) * 1951-12-24 1956-07-03 American Can Co Tear open container with separate tongue
US2806628A (en) * 1955-05-27 1957-09-17 Raytheon Mfg Co Tear tabs for tin cans and methods for forming them
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
FR2304434A1 (en) * 1975-03-19 1976-10-15 Paul Opprecht ELECTRICAL WELDING PROCESS AND RESISTANCE WELDING MACHINE FOR IMPLEMENTING THE PROCESS
EP0167855A2 (en) * 1984-07-12 1986-01-15 Elpatronic Ag Tearable box body
EP0197498A2 (en) * 1985-04-09 1986-10-15 Elpatronic Ag Tearable container part

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EP0197498A2 (en) * 1985-04-09 1986-10-15 Elpatronic Ag Tearable container part
EP0197498A3 (en) * 1985-04-09 1988-07-27 Elpatronic Ag Tearable container part

Also Published As

Publication number Publication date
US4795295A (en) 1989-01-03
FR2570679A1 (en) 1986-03-28
BR8504714A (en) 1986-07-22
JPH0525576B2 (en) 1993-04-13
CH682906A5 (en) 1993-12-15
FI853656A0 (en) 1985-09-24
ES547272A0 (en) 1986-07-16
FI79273C (en) 1989-12-11
GB2165205B (en) 1988-09-01
FR2570679B1 (en) 1990-02-02
DE3515812C2 (en) 1987-10-29
GB8522467D0 (en) 1985-10-16
JPS61123434A (en) 1986-06-11
ES290681Y (en) 1987-04-01
EP0176052B1 (en) 1989-12-13
ES8608354A1 (en) 1986-07-16
US4662534A (en) 1987-05-05
FI853656L (en) 1986-03-26
DE3574694D1 (en) 1990-01-18
ES290681U (en) 1986-07-16
US4915562A (en) 1990-04-10
DE3515812A1 (en) 1986-04-03
EP0176052A3 (en) 1987-11-11
GB2165205A (en) 1986-04-09
FI79273B (en) 1989-08-31

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