EP0222218B1 - Can - Google Patents
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- Publication number
- EP0222218B1 EP0222218B1 EP86114640A EP86114640A EP0222218B1 EP 0222218 B1 EP0222218 B1 EP 0222218B1 EP 86114640 A EP86114640 A EP 86114640A EP 86114640 A EP86114640 A EP 86114640A EP 0222218 B1 EP0222218 B1 EP 0222218B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tongue
- lines
- tear
- strip
- tear strip
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
- B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs
- B21D51/386—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs on the side-wall of containers
Definitions
- the present invention relates to a tin can with a welded side pinch or overlap seam, which is provided with a circumferential tear strip formed between two essentially parallel pre-scored predetermined breaking lines; see e.g. US-A-1 568 438.
- tin cans of this type A problem with tin cans of this type is the application of a tear strip which, despite the side weld seam, can be opened easily and securely using a key.
- the object of the present invention is now to create a tin can with tear strips, which solves this problem in a simple manner satisfactorily while maintaining the quality of the side weld seam.
- this solution consists in that the tongue, at least in the vicinity of the weld seam, is wider than the subsequent tear strip and that the two pre-scored breaking lines are extended into the tongue.
- the safe execution of the welding in the area of the tongue can be guaranteed with a suitable welding current program (increased current for a limited time, i.e. in the tongue area).
- FIG. 1 of the drawing shows a sheet metal blank 1 designed to produce a can according to the invention, in which two predetermined breaking lines 3, 4 running parallel over the entire width of the blank are pre-scored to form a later tear strip 2.
- Such cracks preferably have a V-shaped cross section and their greatest depth lies approximately in the middle of the sheet thickness (depending on the sheet thickness).
- the tear strip 2 formed between the predetermined breaking lines 3, 4 has, for the purpose of tearing open, a tongue 5 which is wider than the subsequent actual tear strip 2.
- the two pre-scored breaking lines 3, 4 are extended into the tongue 5.
- a sheet metal frame 6 (FIG. 2), formed by means of the blank 1 by welding, is used to manufacture a can (by attaching it, a base and, after filling, a lid).
- the can is opened by means of a key (not shown), which is attached to the tongue 5, by tearing open the pre-scored tear strip 2 in a manner known per se.
- FIG. 2 of the drawing shows a can frame 6 formed from the sheet metal blank 1 by welding a side pinch or overlap seam 7.
- FIGS. 3 and 4 show sections through the frame wall in the area of the weld seam 7, FIG. 3 showing the very homogeneous weld in the normal overlap sector, while FIG. 4 shows the seam 7 in the sector of the tongue 5.
- this sector there is a cold welding, since the larger resistance increases the transition resistance due to the tongue 5. Thanks to this cold welding, the can can be opened later without any problems.
- the safe execution of the cold welding is guaranteed with a suitable welding current program, thanks to which the welding current can be increased in the sector of the tongue 5.
- Figure 5 shows a detail of the frame 6 of Figure 2 on an enlarged scale. This shows how the weld seam 7 is broken or torn when the tongue 5 is raised for the purpose of opening the can.
- the corresponding possible tear lines (shown in dashed lines), starting from the outer edge of the tongue 5, run through the weld seam 7 inwards and ends securely in the scored lines 3 and 4.
- the cans designed according to the invention with a cold welding point as an opening gap can be used in the field of technical packaging, possibly also in the food sector.
Abstract
Description
Die vorliegende Erfindung betrifft eine Blech dose mit einer geschweissten seitlichen Quetsch-oder Ueberlappnaht, welche mit einem umlaufenden, zwischen zwei im wesentlichen parallel zueinander verlaufenden vorgeritzten Sollbruchlinien gebildeten Aufreissstreifen versehen ist; siehe z.B. US-A-1 568 438.The present invention relates to a tin can with a welded side pinch or overlap seam, which is provided with a circumferential tear strip formed between two essentially parallel pre-scored predetermined breaking lines; see e.g. US-A-1 568 438.
Ein Problem bei Blechdosen dieser Art liegt im Anbringen eines Aufreissstreifens, der trotz der seitlichen Schweissnaht mittels eines Schlüssels leicht und sicher zu öffnen ist.A problem with tin cans of this type is the application of a tear strip which, despite the side weld seam, can be opened easily and securely using a key.
Bei den heute bekannten Ausführungsformen, bei denen die den Anfang des Aufreissstreifens bildende Zunge die gleiche Breite aufweist wie der zwischen den Ritzlinien verlaufende eigentliche Aufreissstreifen, zeigt sich nämlich immer wieder, dass nach Ueberwindung de Schweissnaht (durch deren mechanische Zerstörung) die Gefahr besteht, dass die tatsächliche Risslinie nicht entlang der Sollbruchlinien verläuft, sondern wenigstens eine der beiden Risslinien von der vorgeritzten Sollbruchlinie wegläuft. Solche ungewollten Risslinien laufen immer in einer Dreieckform nach innen, entweder zur zweiten Sollbruchlinie oder zur zweiten ungewollten Risslinie. Damit ist natürlich der Ausfreissstreifen bereits vorzeitig zerstört und ein weiteres Oeffnen der Blechdose ohne Zusatzwerkzeug nicht mehr möglich.In the embodiments known today, in which the tongue forming the start of the tear strip has the same width as the actual tear strip running between the scoring lines, it is shown time and again that after the weld seam has been overcome (due to its mechanical destruction) there is a risk that the actual crack line does not run along the predetermined breaking lines, but at least one of the two crack lines runs away from the pre-scored predetermined breaking line. Such unwanted tear lines always run in a triangular shape, either to the second predetermined breaking line or to the second unwanted crack line. Of course, the tear-off strip is destroyed prematurely and a further opening of the tin can is no longer possible without additional tools.
Aufgabe der vorliegenden Erfindung ist es nun, eine Blechdose mit Aufreissstreifen zu schaffen, welcher dieses Problem bei gleichbleibender Qualität der seitlichen Schweissnaht auf einfache Weise befriedigend löst.The object of the present invention is now to create a tin can with tear strips, which solves this problem in a simple manner satisfactorily while maintaining the quality of the side weld seam.
Diese Lösung besteht bei einer Blechdose der genannten Art erfindungsgemäss darin, dass die Zunge wenigstens in Nähe der Schweissnaht breiter ausgebildet ist als der anschliessende Aufreissstreifen und dass die beiden vorgeritzten Sollbruchlinien bis in die Zunge hinein verlängert sind.In the case of a tin can of the type mentioned, this solution consists in that the tongue, at least in the vicinity of the weld seam, is wider than the subsequent tear strip and that the two pre-scored breaking lines are extended into the tongue.
Dank dieser Ausgestaltung der Blechdose ist ausserhalb des Bereiches der Zunge bei deren Bildung mittels einer seitlichen Quetsch- oder Ueberlappnaht eine gute Schweissung bei hoher Homogenität des Schweissgutes erreichbar. Im Bereich der Zunge bzw. des Aufreissstreifens entsteht eine Kaltschweissung, da durch die vergrösserte Kontaktfläche an dieser Stelle der Uebergangswiderstand vergrössert wird. Das Entstehen dieser Kaltschweissung ermöglicht das problemlose Oeffnen der Dosen.Thanks to this design of the tin can, outside the area of the tongue, when it is formed, a good weld with a high degree of homogeneity of the weld metal can be achieved by means of a side pinch or lap seam. A cold weld occurs in the area of the tongue or tear strip, since the increased contact area at this point increases the transition resistance. The emergence of this cold welding enables the cans to be opened easily.
Die sichere Ausführung der Schweissung im Bereich der Zunge kann mit einem passenden Schweissstrom-Programm (erhöhter Strom während begrenzter Zeit, d.h. im Zungenbereich) garantiert werden.The safe execution of the welding in the area of the tongue can be guaranteed with a suitable welding current program (increased current for a limited time, i.e. in the tongue area).
Dank der bereits in der verbreiterten Zunge vorhandenen Sollbruchlinien, welche praktisch geradlinig durch die Schweissnaht verlaufen, laufen die tatsächlichen Risslinien zwar zuerst auch nach innen, enden jedoch schliesslich auf den vorgeritzten Sollbruchlinien.Thanks to the predetermined breaking lines already present in the widened tongue, which run practically rectilinearly through the weld seam, the actual crack lines initially run inwards, but ultimately end on the pre-scored predetermined breaking lines.
Die Erfindung wird nachstehend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels noch etwas näher erläutert. Es zeigt:
- Fig. 1 eine Draufsicht auf einen zur Herstellung einer erfindungsgemässen Dose ausgebildeten Blechzuschnitt;
- Fig. 2 eine mit dem Blechzuschnitt nach Fig. 1 hergestellte Bleckzarge;
- Fig. 3 einen Schnitt entlang der Linie A-A von Fig. 2;
- Fig. 4 einen Schnitt entlang der Linie B-B von Fig. 2, und
- Fig. 5 einen vergrösserten Ausschnitt aus Fig. 2.
- 1 shows a plan view of a sheet metal blank designed for producing a can according to the invention;
- FIG. 2 shows a sheet metal frame produced with the sheet metal blank according to FIG. 1;
- 3 shows a section along the line AA of FIG. 2.
- Fig. 4 is a section along the line BB of Fig. 2, and
- 5 shows an enlarged detail from FIG. 2.
Figur 1 der Zeichnung zeigt einen zur Herstellung einer erfindungsgemäss en Dose ausgebildeten Blechzuschnitt 1, bei welchem zur Bildung eines späteren Aufreissstreifens 2 zwei über die ganze Breite des Zuschnitts verlaufende parallel Sollbruchlinien 3, 4 vorgeritzt sind. Solche Ritzen haben vorzugsweise einen V-förmigen Querschnitt und deren grösste Tiefe liegt etwa in Mitte der Blechdicke (von der Blechdicke abhängig). Der zwischen den Sollbruchlinien 3, 4 gebildete Aufreissstreifen 2 hat zum Zweck des Aufreissens eine Zunge 5, welche breiter ausgebildet ist als der anschliessende, eigentliche Aufreissstreifen 2. Die beiden vorgeritzten Sollbruchlinien 3, 4 sind bis in die Zunge 5 hinein verlängert.FIG. 1 of the drawing shows a sheet metal blank 1 designed to produce a can according to the invention, in which two predetermined
Eine mittels des Zuschnitts 1 durch Schweissen gebildete Blechzarge 6 (Figur 2) dient zur Fertigung einer Dose (durch Anbringen, eines Bodens und, nach dem Füllen, eines Deckels). Die Dose wird mittels eines Schlüssels (nicht dargestellt), welcher an der Zunge 5 angesetzt wird, durch Aufreissen des vorgeritzten Aufreissstreifens 2 in an sich bekannter Weise geöffnet.A sheet metal frame 6 (FIG. 2), formed by means of the blank 1 by welding, is used to manufacture a can (by attaching it, a base and, after filling, a lid). The can is opened by means of a key (not shown), which is attached to the
Figur 2 der Zeichnung zeigt eine aus dem Blechzuschnitt 1 durch Schweissen einer seitlichen Quetsch- oder Ueberlappnaht 7 gebildete Dosenzarge 6. Hinter der durchgehenden Schweissnaht 7 steht frei die Zunge 5 ab (sie liegt mehr oder weniger dicht an der darunterliegenden Zargenwand 1 an).FIG. 2 of the drawing shows a can
Die Figuren 3 und 4 zeigen Schnitte durch die Zargenwand im Bereich der Schweissnaht 7, wobei Figur 3 die sehr homogene Schweissung im normalen Ueberlappungssektor darstellt, während Figur 4 die Naht 7 im Sektor der Zunge 5 zeigt. In diesem Sektor ergibt sich eine Kaltschweissung, da sich durch die grössere Fläche wegen der Zunge 5 der Uebergangswiderstand vergrössert. Dank dieser Kaltschweissung lässt sich später die Dose problemlos öffnen.FIGS. 3 and 4 show sections through the frame wall in the area of the
Die sichere Ausführung der Kaltschweissung wird mit einem geeigneten Schweissstrom-Programm garantiert, dank welchem im Sektor der Zunge 5 der Schweissstrom erhöht werden kann.The safe execution of the cold welding is guaranteed with a suitable welding current program, thanks to which the welding current can be increased in the sector of the
Figur 5 zeigt einen Ausschnitt aus der Zarge 6 nach Figur 2 in vergrössertem Massstab. Daraus geht hervor, wie bei einem Anheben der Zunge 5 zwecks Oeffnens der Dose die Schweissnaht 7 durchbrochen bzw. durchgerissen wird. Die entsprechenden möglichen Risslinien (gestrichelt dargestellt), vom äusseren Rand der Zunge 5 ausgehend, verlaufen durch die Schweissnaht 7 nach innen und enden sicher in den vorgeritzten Sollbruchlinien 3 bzw. 4.Figure 5 shows a detail of the
Die erfindungsgemäss ausgebildeten Dosen mit Kaltschweissstelle als Oeffnungslücke, können im Bereich der technischen Verpackungen, ggf. auch im Nahrungsmittelbereich verwendet werden.The cans designed according to the invention with a cold welding point as an opening gap can be used in the field of technical packaging, possibly also in the food sector.
Claims (1)
- Sheet metal can having a lateral calender or lap welding seam (7), said can presenting a tear strip (2) surrounding the can and formed between two spaced substantially parallel preformed rupturable lines (3, 4), the beginning of the strip behind said welding seam having the shape of a free tongue (5), characterized in that said tongue has a width, at least in the neighbourhood of the welding seam (7), which is larger than the following tear strip (2) and in that the two preformed rupturable lines (3, 4) are extended into said tongue (5).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT86114640T ATE59012T1 (en) | 1985-11-04 | 1986-10-22 | TIN CAN. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH4728/85A CH667819A5 (en) | 1985-11-04 | 1985-11-04 | SHEET METAL CUTTING FOR THE MANUFACTURE OF WELDED SHEET METAL FRAMES FOR TIN CANS. |
CH4728/85 | 1985-11-04 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0222218A2 EP0222218A2 (en) | 1987-05-20 |
EP0222218A3 EP0222218A3 (en) | 1988-12-14 |
EP0222218B1 true EP0222218B1 (en) | 1990-12-12 |
Family
ID=4281470
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86114640A Expired - Lifetime EP0222218B1 (en) | 1985-11-04 | 1986-10-22 | Can |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0222218B1 (en) |
JP (1) | JPS62182039A (en) |
AT (1) | ATE59012T1 (en) |
CH (1) | CH667819A5 (en) |
DE (1) | DE3676165D1 (en) |
ES (1) | ES2019867B3 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE99999C (en) * | ||||
GB191302618A (en) * | 1913-01-31 | 1914-01-29 | Allen Gardiner Ingalls | Improvements in or relating to Cans or like Vessels. |
US1568438A (en) * | 1924-02-02 | 1926-01-05 | Thermokept Corp | Can |
US2348750A (en) * | 1941-10-07 | 1944-05-16 | American Can Co | Container |
US3021805A (en) * | 1960-01-14 | 1962-02-20 | Continental Can Co | Method of making a tear strip can body |
AT245342B (en) * | 1963-07-01 | 1966-02-25 | Papier Und Blechdruckindustrie | Device for making cans |
-
1985
- 1985-11-04 CH CH4728/85A patent/CH667819A5/en not_active IP Right Cessation
-
1986
- 1986-10-22 AT AT86114640T patent/ATE59012T1/en not_active IP Right Cessation
- 1986-10-22 ES ES86114640T patent/ES2019867B3/en not_active Expired - Lifetime
- 1986-10-22 DE DE8686114640T patent/DE3676165D1/en not_active Expired - Fee Related
- 1986-10-22 EP EP86114640A patent/EP0222218B1/en not_active Expired - Lifetime
- 1986-10-31 JP JP61258713A patent/JPS62182039A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
JPS62182039A (en) | 1987-08-10 |
ATE59012T1 (en) | 1990-12-15 |
EP0222218A3 (en) | 1988-12-14 |
ES2019867B3 (en) | 1991-07-16 |
EP0222218A2 (en) | 1987-05-20 |
CH667819A5 (en) | 1988-11-15 |
DE3676165D1 (en) | 1991-01-24 |
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