EP0197498B1 - Aufreissbares Dosenteil - Google Patents

Aufreissbares Dosenteil Download PDF

Info

Publication number
EP0197498B1
EP0197498B1 EP86104479A EP86104479A EP0197498B1 EP 0197498 B1 EP0197498 B1 EP 0197498B1 EP 86104479 A EP86104479 A EP 86104479A EP 86104479 A EP86104479 A EP 86104479A EP 0197498 B1 EP0197498 B1 EP 0197498B1
Authority
EP
European Patent Office
Prior art keywords
field
tear
member according
strip
scorings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP86104479A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0197498A2 (de
EP0197498A3 (en
Inventor
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
Original Assignee
Elpatronic AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Elpatronic AG filed Critical Elpatronic AG
Publication of EP0197498A2 publication Critical patent/EP0197498A2/de
Publication of EP0197498A3 publication Critical patent/EP0197498A3/de
Application granted granted Critical
Publication of EP0197498B1 publication Critical patent/EP0197498B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 tab is stamped 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 incisions which laterally delimit the tear strip, a starting incision connecting these incisions is stamped into the sheet metal blank near 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.
  • 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.
  • EP-A-167855 which belongs to the state of the art under Article 54 (3) EPC, proposed a tear-open can part of the type described in the opening paragraph, in which the starting scoring is formed by a scoring line , which extends across the tear strip and possibly extends a short distance beyond each of the two scratches laterally delimiting the tear strip.
  • the invention is therefore based on the object of developing a tearable can part of the type described at the outset in such a way that the tear-open process is not noticeably complicated even by relatively large manufacturing inaccuracies of the type described.
  • the object is achieved in that the starting score is part of a field of several scratches formed on the tear strip below the tab and the welding zone partially covers this field.
  • the size of the field and the distance between the scratches forming the field from one another can be matched to the sheet thickness and the other properties of the can part and the tab, and made dependent on the working accuracy of the available manufacturing facilities, based on simple tests, so that even when the worst comes together Tolerances the welding zone partially - but only partially - covers the field formed by the scratches, so that at least one scratch is not covered by the welding zone but is located at such a small distance from it that this scratching gives way to the tear strip in an articulated manner and then tears, if the flap is rolled up with a key.
  • the field extends over two thirds to four fifths of the width of the tear strip.
  • the field is preferably circular or square, since it can generally be arranged that the manufacturing tolerances described are approximately equal in all directions of the plane of the field.
  • the field is formed by concentric circular scratches.
  • Such scratches can be produced with an embossing stamp which can be produced in a particularly simple manner by turning.
  • circular scratches have the advantage that they have particularly little tendency to break open and thereby render the can part unusable when it is subjected to bending and / or stretching loads. Bending loads occur, for example, when the can part is rolled into a cylindrical can body in the form of a flat sheet metal blank.
  • increased bending stresses can occur if a filled can is deformed due to careless handling.
  • Elongation stresses which can become critical in the area of the initial scoring, occur particularly when an initially cylindrically rolled can part is expanded to form a cuboid or truncated pyramid or frustoconical frame.
  • a field made up of a plurality of scratches which extend transversely to the tear strip and is preferably supplemented by a plurality of scratches which extend in the longitudinal direction of the tear strip is also suitable.
  • Another alternative is that the field has several intersecting diagonal scratches.
  • the tab of a tearable can part has a thickened portion at its welded end in the form of an arrow directed towards the free end of the tab.
  • the present invention can be developed in a particularly advantageous manner in that the tip of the arrow-shaped thickening is arranged over the center of the field formed by the starting scoring and several other scoring.
  • the tab prefferably has a triangular depression on its underside above the field, which limits the welding zone to an arrow-shaped part of the field. In this way, the forces generated when the flap is rolled up by means of a key are concentrated in the middle of the field, so that the marking gradually widens from there, following the edge of the welding zone, until it reaches the longitudinal scratches that laterally delimit the tear strip.
  • the can part 10 shown is an originally rectangular sheet metal blank with two longitudinal edges 12 and 14.
  • the can part 10 is rolled into a cylindrical frame in the course of the manufacture of a can, as indicated by a circle in FIG. 1. Then the two longitudinal edges 12 and 14 are welded together.
  • the weld seam can be an overlapped squeeze seam or, as indicated in FIGS. 1 and 2, a butt seam that can be produced by laser welding.
  • the can part 10 has a pair of parallel scratches 16 which are embossed at right angles to the longitudinal edges 12 and 14 and laterally delimit a tear strip 18 which extends over the entire circumference of the finished can.
  • a tab 20 is welded to the tear strip 18, onto which a key 22 can be attached according to FIGS. 1 and 2 in order to first roll up the tab 20 and then the entire tear strip 18.
  • the key 22 rolls along one of two flanged edges 24, which connect the box-shaped can part according to FIG. 1, each with a lid or bottom 26.
  • the tear strip 18 can have between the two scratches 16 laterally delimiting it and parallel to these one (FIGS. 1 to 3) or two (FIGS. 5 to 8) additional longitudinal scratches, which likewise extend over the entire circumference of the can.
  • a field 28 is embossed from a plurality of scratches, one of which acts as the starting scratch 30 when the flap 20 is rolled up.
  • the field 28 is arranged at a sufficient distance from the two longitudinal edges 12 and 14 in order to remain free of any structural change in the sheet which occurs when the two longitudinal edges are welded.
  • the width of the field 28 can match that of the tear strip 18; however, in the preferred examples shown, the field 28 extends only about three quarters of the width of the tear strip.
  • the field 28 can be produced with an embossing stamp, preferably in the flat state of the can part 10 after the incisions 16 have been impressed.
  • the field 28 is formed in the manner of a target from a plurality of concentric circles;
  • the common center of these circles lies as precisely as possible in the middle between the two scratches 16 laterally delimiting the tab 20.
  • the field 28 can, however, also be formed by differently designed, in particular rectilinear carvings, which, for example according to FIGS. 5 and 6, extend at right angles to the lateral carvings 16, the field 28 according to FIG. 6 having additional carvings extend parallel to the side scratches 16. 7 and 8, the field 28 can also be formed by intersecting diagonal scratches. In each of the cases shown in FIGS. 5 to 8, the field 28 can be more or less precisely square or circular.
  • the tab 20 has a free end 32 intended for inserting the key 22, which can be easily bent away from the can part 10, for example with a fingernail.
  • the other end of the tab 20, which is welded to the can part 10, has a thickening 34, which in the examples shown has arisen in that an arrow-shaped end section when punching the tab 20 has been turned out so that its tip 36 is directed to the free end 32.
  • a depression 38 is stamped into the underside of the tab 20, which is also arrow-shaped and directed towards the free end 32, but is smaller than the thickening 34.
  • the depression 38 is bounded in the direction of the free end 32 of the tab 20 by a correspondingly arrow-shaped zone 40 which has a waffle-like surface structure which protrudes slightly from the rest of the underside of the tab.
  • the tab 20 is arranged during welding to the tear strip 18 in such a way that the tip 36 lies as precisely as possible over the center of the field 28.
  • a particularly good current transfer occurs between the waffle-like arrow-shaped zone 40 and the field 28, so that a welding zone 42 is formed where the arrow-shaped zone 40 covers the field 28.
  • the welding zone 42 is thus also essentially arrow-shaped, but does not extend beyond the field 28 and therefore does not reach the two scratches 16 laterally delimiting the tear strip 18, but covers the or each additional longitudinal scratch arranged between the two lateral scratches 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Closures For Containers (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Automotive Seat Belt Assembly (AREA)
EP86104479A 1985-04-09 1986-04-02 Aufreissbares Dosenteil Expired - Lifetime EP0197498B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1511/85A CH658034A5 (de) 1985-04-09 1985-04-09 Aufreissbares dosenteil.
CH1511/85 1985-04-09

Publications (3)

Publication Number Publication Date
EP0197498A2 EP0197498A2 (de) 1986-10-15
EP0197498A3 EP0197498A3 (en) 1988-07-27
EP0197498B1 true EP0197498B1 (de) 1990-07-25

Family

ID=4212147

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86104479A Expired - Lifetime EP0197498B1 (de) 1985-04-09 1986-04-02 Aufreissbares Dosenteil

Country Status (14)

Country Link
US (1) US4651891A (enrdf_load_stackoverflow)
EP (1) EP0197498B1 (enrdf_load_stackoverflow)
JP (1) JPS61244746A (enrdf_load_stackoverflow)
AU (1) AU581589B2 (enrdf_load_stackoverflow)
BR (1) BR8601585A (enrdf_load_stackoverflow)
CA (1) CA1264683A (enrdf_load_stackoverflow)
CH (1) CH658034A5 (enrdf_load_stackoverflow)
DE (2) DE3516390A1 (enrdf_load_stackoverflow)
DK (1) DK160486A (enrdf_load_stackoverflow)
ES (1) ES296598Y (enrdf_load_stackoverflow)
FI (1) FI861454L (enrdf_load_stackoverflow)
GB (1) GB2173470B (enrdf_load_stackoverflow)
GR (1) GR860913B (enrdf_load_stackoverflow)
NO (1) NO861359L (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH682906A5 (de) * 1984-09-25 1993-12-15 Elpatronic Ag Aufreissbares Dosenteil sowie Verfahren und Vorrichtung zu dessen Herstellung.
CH657824A5 (de) * 1986-01-10 1986-09-30 Elpatronic Ag Aufreissbares dosenteil.
US6401570B1 (en) * 2000-10-18 2002-06-11 Frank D. Nadeau Cable stripping tool
US20100251798A1 (en) * 2009-04-06 2010-10-07 The Coca-Cola Company Method of Manufacturing a Metal Vessel

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE629534A (enrdf_load_stackoverflow) *
CH80382A (fr) * 1918-09-11 1919-03-17 Etienne Challet Récipient métallique avec dispositif permettant son ouverture par déchirure d'une paroi
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 (de) * 1955-10-21 1957-10-03 Continental Can Co Blechdose mit ueberlappt geschweisster Laengsnaht und Aufreissstreifen am Umfang des Rumpfes
US3838787A (en) * 1973-01-12 1974-10-01 Ellisco Inc Scored and seam welded can
GB2071045B (en) * 1979-10-03 1983-06-08 Haustrups Fabriker As Opening sealed containers
AU6481580A (en) * 1979-10-26 1981-05-07 Karl Knut Harry Edlund Can closure provided with opening tab
CH669365A5 (enrdf_load_stackoverflow) * 1984-07-12 1989-03-15 Elpatronic Ag
EP0167855B1 (de) * 1984-07-12 1990-05-09 Elpatronic Ag Aufreissbarer Dosenrumpf
CH682906A5 (de) * 1984-09-25 1993-12-15 Elpatronic Ag Aufreissbares Dosenteil sowie Verfahren und Vorrichtung zu dessen Herstellung.
CH668754A5 (de) * 1985-07-10 1989-01-31 Grabher Indosa Maschbau Ag Verfahren zum verschliessen eines dosenartigen behaelters mittels einer membran.

Also Published As

Publication number Publication date
GR860913B (en) 1986-08-04
FI861454A7 (fi) 1986-10-10
DK160486A (da) 1986-10-10
US4651891A (en) 1987-03-24
CH658034A5 (de) 1986-10-15
CA1264683A (en) 1990-01-23
DK160486D0 (da) 1986-04-09
DE3516390A1 (de) 1986-10-16
AU5520286A (en) 1986-10-16
FI861454A0 (fi) 1986-04-04
AU581589B2 (en) 1989-02-23
EP0197498A2 (de) 1986-10-15
DE3672866D1 (de) 1990-08-30
GB2173470A (en) 1986-10-15
ES296598Y (es) 1988-05-16
DE3516390C2 (enrdf_load_stackoverflow) 1989-06-15
GB2173470B (en) 1989-01-25
EP0197498A3 (en) 1988-07-27
FI861454L (fi) 1986-10-10
JPS61244746A (ja) 1986-10-31
JPH0230934B2 (enrdf_load_stackoverflow) 1990-07-10
BR8601585A (pt) 1986-12-09
GB8607095D0 (en) 1986-04-30
ES296598U (es) 1987-12-01
NO861359L (no) 1986-10-10

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