EP0176052B1 - 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
EP0176052B1
EP0176052B1 EP85111945A EP85111945A EP0176052B1 EP 0176052 B1 EP0176052 B1 EP 0176052B1 EP 85111945 A EP85111945 A EP 85111945A EP 85111945 A EP85111945 A EP 85111945A EP 0176052 B1 EP0176052 B1 EP 0176052B1
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EP
European Patent Office
Prior art keywords
welded
tongue
thickened portion
member according
sheet
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
Application number
EP85111945A
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German (de)
French (fr)
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EP0176052A2 (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 flap which is welded onto the tear strip as a separate sheet metal part with a preformed end and extends in the longitudinal direction thereof.
  • Such can parts are rolled out of an initially flat sheet metal blank 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 tear open the can, a key is placed on the flap on the can body, which is unrolled at the nearest edge of the flange.
  • the object of the invention is to make opening the can easier and more secure, but without complicating the manufacture or making it difficult to attach the can key.
  • the tab has a thickened portion at its welded end, which is formed by an end part bent over in the direction of the other, free end of the tab.
  • the invention is particularly suitable for use in a can part with two longitudinal edges which are welded or weldable in an overlapping manner.
  • the tab is preferably welded on outside the overlap area of the longitudinal edges. This avoids any influence of the flap 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 scratching is required; the positioning of the tab in relation to the can part with which it is to be welded is therefore possible with simple means and with little expenditure of time.
  • the thickening of the tab projects outwards, away from the can part.
  • the tab according to the invention can be placed on the sheet metal of the can part as smoothly as a non-bent tab, so that it does not, or in any case not disruptively, protrude from the can part and, furthermore, the risk is extremely low that an impact on the Flap an unintentional perforation arises.
  • the intended marking can be made even easier by the fact that the thickening ends in an edge, from which at least a section extends obliquely to the scratches. It is advantageous if the thickening has the shape of an arrow pointing towards the free end of the tab. In particular, the thickening expediently has the shape of a rectangle and an adjoining isosceles triangle, the legs of which form the edge.
  • the tab preferably has a zone prepared for welding with a corrugated or waffle-like surface structure.
  • Can parts according to the invention can be Manufacture by a method in which a flat sheet metal blank provided with scoring is rolled into a cylinder with overlapping longitudinal edges, which are then welded to one another. This method is further developed according to the invention in that an end part of the tab is bent to form a thickening, that the tab is welded to the tear strips of the flat sheet metal blank in the region of the thickening and that the sheet metal blank is only rolled afterwards.
  • 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 somewhat larger than the width or thickness of the welded-on tab including its thickening.
  • a cylindrical socket part 10 is shown, which consists for example of tin plate with a thickness of 0, 2 mm.
  • the box position i 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 to the tear strip 18, which consists, for example, of tinplate with a thickness of 0.4 mm and extends in the longitudinal direction of the tear strip 18 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 in all of the examples shown in FIGS. 2a-2d, which only takes up part of the length according to FIGS. 2a and 2b, while the entire length of the folded edge 24 according to FIGS. 2c and 2d .
  • 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 points arrow-shaped towards the free end 26 according to FIGS. 2a and 2b, but runs transversely to the scratches 16 according to FIGS. 2c and 2d.
  • the tab 20 has, on its side facing away from the folded 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. 2b 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 spattering of tin when the tab 20 is welded to the tear strip 18 using an electrical resistance spot welding method.
  • zone 30 that part of the tab 20 which is designed to insert a key and tapers 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.
  • 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.

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 vorgeformten Ende 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 flap which is welded onto the tear strip as a separate sheet metal part with a preformed end and extends in the longitudinal direction thereof.

Solche Dosenteile werden aus einem zunächst ebenen Blechzuschnitt 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 am Dosenrumpf ein Schlüssel aufgesteckt, der am nächstgelegenen Bördelrand abgerollt wird.Such can parts are rolled out of an initially flat sheet metal blank 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 tear open the can, a key is placed on the flap on the can body, which is unrolled at the nearest edge of the flange.

Bei einem bekannten aufreissbaren Dosenteil dieser Art (US-A-2 806 628) ist das angeschweisste Ende der Lasche durch Einpressen einer V-förmigen Sicke vorgeformt, offenbar um eine gute, klar abgegrenzte Schweissverbindung zu erzielen. Bei einer solchen Ausbildung der Lasche ist erfahrungsgemäss ein zuverlässiges Oeffnen der Dose nicht immer gewährleistet und es gelingt vor allem ungeübten Verbrauchern nicht immer auf Anhieb, den Aufreissstreifen 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 Umfangsritzen treffen. Wie gefunden wurde, liegt dies vorwiegend an einer ungenügenden bzw. unvollkommenen Kraftübertragung von der Lasche auf den Aufreissstreifen bei beginnendem Aufrollen der Lasche. Diese kann auch nicht beliebig dick gewählt werden, weil sie sonst vom Schlüssel nicht erfasst und gerollt werden kann.In a known tearable can part of this type (US-A-2 806 628), the welded end of the tab is preformed by pressing in a V-shaped bead, apparently in order to achieve a good, clearly defined weld connection. Experience has shown that reliable opening of the can is not always guaranteed with such a design of the tab, and inexperienced consumers in particular are not always able to remove the tear strip completely straight away. 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 gaps. As was found, this is mainly due to insufficient or incomplete power transmission from the flap to the tear strip when the flap begins to roll up. This cannot be chosen to be of any thickness, because otherwise it cannot be grasped and rolled by the key.

Demnach stellt sich für die Erfindung die Aufgabe, das Aufreissen der Dose zu erleichtern und sicherer zu gestalten, ohne aber die Herstellung zu komplizieren oder das Ansetzen des Dosenschlüssels zu erschweren.Accordingly, the object of the invention is to make opening the can easier and more secure, but without complicating the manufacture or making it difficult to attach the can key.

Diese Aufgabe ist erfindungsgemäss dadurch gelöst, dass die Lasche an ihrem angeschweissten Ende eine Verdickung aufweist, die von einem in Richtung zu dem anderen, freien Ende der Lasche umgebogenen Endteil gebildet ist.According to the invention, this object is achieved in that the tab has a thickened portion at its welded end, which is formed by an end part bent over in the direction of the other, free end of the tab.

Dadurch erhalten Lasche und Aufreissstreifen in dem Bereich, in dem sie miteinander verschweisst sind, eine bedeutend erhöhte Steifigkeit. Dennoch lässt sich die Lasche mit einem Schlüssel ebenso leicht erfassen und aufrollen wie eine gewöhnliche Lasche gleicher Breite und Blechdicke. Sobald aber der beim Aufrollen entstehende Wickel die Verdickung erreicht, übt diese unvermittelt eine ausgeprägte Hebelwirkung aus, welche den Aufreissstreifen gleichzeitig nach innen knickt und auf Zug beansprucht. Es bildet sich so ein Anriss, der die beiden Ritzungen rasch und zuverlässig erreicht und diesen dann folgt.This gives the flap and tear strips a significantly increased stiffness in the area in which they are welded together. Nevertheless, the tab can be gripped and rolled up just as easily with a key as an ordinary tab of the same width and sheet thickness. However, as soon as the wrap that occurs when it is rolled up reaches the thickening, it suddenly exerts a pronounced leverage effect, which at the same time kinks the tear strip inward and stresses it in tension. This creates a crack that quickly and reliably reaches the two scratches and then follows them.

In der Absicht, den Aufreissvorgang sicherer zu gestalten, ist in der prioritätsälteren EP-A-0 167 855 ein Dosenrumpf vorgeschlagen worden, bei dem eine unverdickte Lasche mit einem ihrer Enden an den Aufreissstreifen im Bereich des äusseren 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 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 EP-A-0 167 855, which has a higher priority and in which an uncompromised flap is welded with one of its ends to the tear strips in the region of the outer 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, in the short cycle times of fractions of a second that have to be observed in industrial can production, it has proven difficult to weld the tab so precisely on the outer longitudinal edge and with such a precisely metered welding current that the tearing process in the desired manner facilitates the quality of the longitudinal seam is not reduced.

Die Erfindung eignet sich besonders zur Anwendung bei einem Dosenteil mit zwei Längsrändem, die überlappend miteinander verschweisst oder verschweissbar sind. In diesem Fall ist die Lasche vorzugsweise ausserhalb des Ueberlappungsbereichs 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 deshalh 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 or weldable 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 flap 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 scratching is required; the positioning of the tab in relation 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 die Verdickung der Lasche nach aussen, vom Dosenteil weg, vorspringt. Bei dieser Anordnung lässt sich die erfindungsgemässe Lasche ebenso glatt wie eine nicht umgebogene Lasche an das Blech des Dosenteils anlegen, so dass sie 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.It is particularly advantageous if the thickening of the tab projects outwards, away from the can part. With this arrangement, the tab according to the invention can be placed on the sheet metal of the can part as smoothly as a non-bent tab, so that it does not, or in any case not disruptively, protrude from the can part and, furthermore, the risk is extremely low that an impact on the Flap an unintentional perforation arises.

Das beabsichtigte Anreissen lässt sich noch weiter dadurch erleichtern, dass die Verdickung in einer Randkante endet, von der sich mindestens ein Abschnitt schräg zu den Ritzungen erstreckt. Es ist vorteilhaft, wenn die Verdickung die Form eines zum freien Ende der Lasche weisenden Pfeils hat. Insbesondere hat die Verdickung zweckmässigerweise die Form eines Rechtecks und eines sich daran anschliessenden gleichschenkligen Dreiecks, dessen Schenkel die Randkante bilden.The intended marking can be made even easier by the fact that the thickening ends in an edge, from which at least a section extends obliquely to the scratches. It is advantageous if the thickening has the shape of an arrow pointing towards the free end of the tab. In particular, the thickening expediently has the shape of a rectangle and an adjoining isosceles triangle, the legs of which form the edge.

Die Lasche hat an ihrer Verdickung vorzugsweise eine zum Anschweissen vorbereitete Zone mit geriffelter oder waffelartiger Oberflächenstruktur.At its thickening, the tab preferably has a zone prepared for welding with a corrugated or waffle-like surface structure.

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 ein Endteil der Lasche zur Bildung einer Verdickung umgebogen wird, dass die Lasche im Bereich der Verdickung an den Aufreissstreifen des ebenen Blechzuschnitts geschweisst wird und dass der Blechzuschnitt erst anschliessend gerollt wird.Can parts according to the invention can be Manufacture by a method in which a flat sheet metal blank provided with scoring is rolled into a cylinder with overlapping longitudinal edges, which are then welded to one another. This method is further developed according to the invention in that an end part of the tab is bent to form a thickening, that the tab is welded to the tear strips of the flat sheet metal blank in the region of the thickening and that the sheet metal blank is only rolled afterwards.

Zum Durchführen dieses Verfahrens 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 Verdickung.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 somewhat larger than the width or thickness of the welded-on tab including its thickening.

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-2d verschiedene Ausführungsformen der Lasche vor dem Anschweissen und
  • Fig. 3 eine Vorrichtung zum Rollen von Dosenteilen gemäss Fig. 1.
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 is a tearable can part with welded tab,
  • Fig. 2a-2d different embodiments of the tab before welding and
  • 3 shows a device for rolling can parts according to FIG. 1.

In Fig. 1 ist ein zylindrisches Dosenteil 10 dargestellt, das beispielsweise aus Weissblech mit einer Dicke von 0,2 mm besteht. Das Dosentell i 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 0,4 mm besteht und sich in Längsrichtung des Aufreißstreifens 18 erstreckt, ohne einen der Längsränder 12 oder 14 des Dosenteils 10 zu erreichen.In Fig. 1 a cylindrical socket part 10 is shown, which consists for example of tin plate with a thickness of 0, 2 mm. The box position i 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 to the tear strip 18, which consists, for example, of tinplate with a thickness of 0.4 mm and extends in the longitudinal direction of the tear strip 18 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.The folded edge 24 of the flap 20 has a rectangular area in all of the examples shown in FIGS. 2a-2d, which only takes up part of the length according to FIGS. 2a and 2b, while the entire length of the folded edge 24 according to FIGS. 2c and 2d . 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 points arrow-shaped towards the free end 26 according to FIGS. 2a and 2b, but runs transversely to the scratches 16 according to FIGS. 2c and 2d.

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 bestinmte, 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 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. 2b 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 spattering of tin when the tab 20 is welded to the tear strip 18 using an electrical resistance spot welding method. Compared to zone 30, that part of the tab 20 which is designed to insert a key and tapers 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.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 cuts 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 Überlappnaht 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.

Claims (9)

1. A tear-open can member of sheet metal with a pair of scorings (16) which define a tearing strip (18) laterally, and a tongue (20) which is welded, in the form of a separate sheet-metal member with a pre-shaped end, onto the tearing strip (18) and extends in the longitudinal direction thereof, characterised in that the tongue (20) comprises a thickened portion (24) at its welded-on end (22), which thickened portion is formed by an end portion bent back towards the other free end (26) of the tongue (20).
2. A can member according to Claim 1, having two longitudinal edges (12, 14) which are or can be welded to one another in an overlapping manner, characterised in that the tongue (20) is welded on outside the overlapping range of the longitudinal edges (12, 14).
3. A can member according to either one of Claims 1 or 2, characterised in that the thickened portion (24) projects outwards, away from the can member (10).
4. A can member according to any one of Claims 1 to 3, characterised in that the thickened portion (24) ends in a marginal edge (28) of which at least one portion extends obliquely to the scorings (16).
5. A can member according to Claim 4, characterised in that the thickened portion (24) has the shape of an arrow pointing towards the free end (26) of the tongue (20).
6. A can member according to Claim 5, characterised in that the thickened portion (24) has the shape of a rectangle and of an isosceles triangle following thereon, the sides of which form the marginal edge (28).
7. A can member according to any one of Claims 1 to 6, characterised in that, on the thickened portion (24), the tongue (20) has a zone (30) which is prepared for the welding on with a grooved or honeycomb-like surface structure.
8. A method of producing a can member according to any one of Claims 1 to 7, wherein a plane sheet-metal blank (38) provided with scorings (16) is rolled up to form a cylinder with overlapping longitudinal edges (12, 14) which are subsequently welded to one another, characterised in that an end portion of the tongue (20) is bent back to form a thickened portion (24), that the tongue (20) is welded onto the tearing strip (18) of the plane sheet-metal blank (38) in the region of the thickened portion (24), and that the sheet-metal blank (38) is only subsequently rolled up.
9. An apparatus for carrying out the method according to Claim 8 having a plurality of rollers (42, 44) for rolling up the sheet-metal blanks (38), characterised in that those rollers (42) which are adapted to act on the side of the sheet-metal blank (38) intended as the outside of the cylinder each comprise an annular groove (46), the width and depth of which are somewhat greater than the width and thickness respectively of the welded-on tongue (20) together with its thickened portion (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)

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

Family

ID=4278784

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Application Number Title Priority Date Filing Date
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)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH658034A5 (en) * 1985-04-09 1986-10-15 Elpatronic Ag TORNABLE CAN PART.
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

Citations (1)

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EP0167855A2 (en) * 1984-07-12 1986-01-15 Elpatronic Ag Tearable box body

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DE148750C (en) *
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US1924472A (en) * 1930-11-28 1933-08-29 Thomson George Miller Method of and means for manufacturing sound absorbing material
US2187740A (en) * 1936-05-09 1940-01-23 American Can Co Apparatus for producing can bodies
US2353728A (en) * 1937-07-13 1944-07-18 American Can Co Apparatus for producing can bodies
US2315535A (en) * 1940-04-16 1943-04-06 American Can Co Blank feeder for can bodymakers
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
US2965263A (en) * 1955-07-30 1960-12-20 Ebauches Sa Charging device
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
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DE2559671C2 (en) * 1975-03-19 1982-08-12 Opprecht, Paul, 8962 Bergdietikon, Aargau Device for semi-automatic or fully automatic electrical resistance longitudinal seam-pinch seam welding of can bodies
US4445620A (en) * 1982-05-21 1984-05-01 Minnesota Mining And Manufacturing Company Tamper-proof closure for container
CH669365A5 (en) * 1984-07-12 1989-03-15 Elpatronic Ag
CH658034A5 (en) * 1985-04-09 1986-10-15 Elpatronic Ag TORNABLE CAN PART.

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
EP0167855A2 (en) * 1984-07-12 1986-01-15 Elpatronic Ag Tearable box body

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
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
EP0176052A2 (en) 1986-04-02
EP0176052A3 (en) 1987-11-11
GB2165205A (en) 1986-04-09
FI79273B (en) 1989-08-31

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