EP0229288B1 - Aufreissbares Dosenteil - Google Patents

Aufreissbares Dosenteil Download PDF

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Publication number
EP0229288B1
EP0229288B1 EP19860116716 EP86116716A EP0229288B1 EP 0229288 B1 EP0229288 B1 EP 0229288B1 EP 19860116716 EP19860116716 EP 19860116716 EP 86116716 A EP86116716 A EP 86116716A EP 0229288 B1 EP0229288 B1 EP 0229288B1
Authority
EP
European Patent Office
Prior art keywords
tear
strip
tongue
starting
starting scoring
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
EP19860116716
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0229288A2 (de
EP0229288A3 (en
Inventor
Felix Kramer
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 EP0229288A2 publication Critical patent/EP0229288A2/de
Publication of EP0229288A3 publication Critical patent/EP0229288A3/de
Application granted granted Critical
Publication of EP0229288B1 publication Critical patent/EP0229288B1/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
    • 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

Definitions

  • the invention relates to a sheet metal can part which can be torn open by means of a flap, with a tear strip laterally delimited by a pair of incisions.
  • tearable can part (DE-B-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 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, and these are then welded together to form a longitudinal seam, so that a cylindrical can body is created.
  • 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 flare.
  • the invention is therefore based on the object of making the tearing process safer in the case of a tearable can part of the type mentioned and also avoiding the flap which causes punching waste and is punched out above a sheet metal edge.
  • the invention relates to a tearable can part according to a first independent claim 1 with subordinate, dependent claims 2 to 7.
  • the invention relates to the designated contracting states CH, DE, FR, GB, IT, LI, NL and SE a tearable can part according to a second independent claim 1 with subordinate, dependent claims 2 to 7.
  • the tearing process becomes more independent of the manufacturing accuracy, i.e. Larger deviations, in particular when aligning the tab to be welded on, can be accepted without impairing the functional reliability when the can is torn open.
  • the lengths of the essentially transverse section and the two away from the free end of the tab, i.e. essentially longitudinal sections of the starting score, and the distance of their transverse section from the welding zone can be based on simple tests on the sheet thickness and the other properties of the Coordinate the can part and the lug and make it dependent on the working accuracy of the available production facilities that even if all tolerances come together unfavorably, the welding zone reliably covers or overlaps the two longitudinal sections of the starting score.
  • the part of the starting score that lies between the overlap areas allows the tear strip to yield in an articulated manner and then tear when the flap is rolled up with a key.
  • the starting scoring has the shape of a transverse arch convex to the free end of the flap over two thirds to four fifths of the width of the tear strip.
  • the starting score can extend essentially parallel to the side scores, following the arc on both sides.
  • the starting score can be circular or oval, or trapezoidal on both sides of the arch.
  • Such starting scratches can be produced with an embossing stamp which is loaded axially symmetrically during embossing and can therefore be guided particularly precisely and almost without wear.
  • self-contained scratches have the advantage that they have 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. In addition, increased bending loads can occur if a filled can is deformed due to careless handling. Stretch Loads, 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.
  • the tab of a tear-open can part has a thickened portion at its welded-on 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 front end of the arrow-shaped thickening or shape is set back against the starting scratch by approximately two or three times the sheet thickness of the can part.
  • 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 laterally delimiting scratches 16 and parallel to these one (FIGS. 1 to 3) or two (FIGS. 6 to 8) additional longitudinal scratches, which likewise extend over the entire circumference of the can.
  • a field 28 is delimited by a starting score 30.
  • 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 is approximately three quarters of the width of the tear strip 18.
  • the starting score 30 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 oval and completely enclosed by the starting score 30;
  • the center of the field 28 lies as precisely as possible in the middle between the two side scratches 16.
  • the field 28 can also be delimited by a differently shaped, in particular circular or approximately trapezoidal starting scratch 30. It is common to all of the illustrated embodiments that a central front section of the starting score or a tangent applied to it extends at right angles to the side scratches 16 and that this central section is adjoined by lateral sections of the starting score which are preferably parallel to the side scratches 16, extend to the rear.
  • 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 has been turned outwards during the punching of the tab 20 in such a way that its 3 to 5 slightly blunted end 36 is directed towards the free end 32 of the tab 20.
  • 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 becomes so when it is welded to the tear strip 18 arranged that its blunted end 36 has a distance a in the order of two to three times the sheet thickness of the can part from the central front portion of the starting score 30.
  • the distance a 0.5 mm.
  • the front end of the recess 38 lies above the center of the field 28.
  • the welding zone 42 deforms where the arrow-shaped zone 40 covers the can part.
  • the welding zone 42 is thus also essentially arrow-shaped; it extends beyond the field 28 and also slightly beyond the two scratches 16 which laterally delimit the tear strip 18.
  • the total width c of the welding zone 42 can be, for example, 7 mm, so that the welding zone extends 0.5 mm beyond the two side scratches.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Making Paper Articles (AREA)
  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
  • Closures For Containers (AREA)
  • Cookers (AREA)
EP19860116716 1986-01-10 1986-12-02 Aufreissbares Dosenteil Expired - Lifetime EP0229288B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH78/86 1986-01-10
CH78/86A CH657824A5 (de) 1986-01-10 1986-01-10 Aufreissbares dosenteil.

Publications (3)

Publication Number Publication Date
EP0229288A2 EP0229288A2 (de) 1987-07-22
EP0229288A3 EP0229288A3 (en) 1989-02-08
EP0229288B1 true EP0229288B1 (de) 1991-07-24

Family

ID=4178765

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860116716 Expired - Lifetime EP0229288B1 (de) 1986-01-10 1986-12-02 Aufreissbares Dosenteil

Country Status (14)

Country Link
US (1) US4700865A (fi)
EP (1) EP0229288B1 (fi)
JP (1) JPS62235054A (fi)
KR (1) KR920002034B1 (fi)
BR (1) BR8700063A (fi)
CA (1) CA1267614A (fi)
CH (1) CH657824A5 (fi)
DE (1) DE3680500D1 (fi)
DK (1) DK170875B1 (fi)
ES (1) ES2024413B3 (fi)
FI (1) FI86981C (fi)
GB (1) GB2186254B (fi)
GR (1) GR3002942T3 (fi)
SU (1) SU1524803A3 (fi)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3935480A1 (de) * 1989-10-25 1991-05-02 Tetra Pak Gmbh Vorrichtung zum abtrennbaren befestigen zweier kunststoffteile und verwendung der vorrichtung fuer eine fliessmittelpackung
EP0433235A1 (de) * 1989-12-11 1991-06-19 Siegfried Frei Verfahren zur Herstellung der Schwächungslinien an Aufreissstreifen und Aufreissdeckel sowie Verfahren zur Herstellung einer Startbruchstelle
FR2880812B1 (fr) 2005-01-20 2007-06-08 Cornilleau Sa Ets Raquette de tennis de table
US20100251798A1 (en) * 2009-04-06 2010-10-07 The Coca-Cola Company Method of Manufacturing a Metal Vessel

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CH669365A5 (fi) * 1984-07-12 1989-03-15 Elpatronic Ag
CH658034A5 (de) * 1985-04-09 1986-10-15 Elpatronic Ag Aufreissbares dosenteil.

Also Published As

Publication number Publication date
JPS62235054A (ja) 1987-10-15
BR8700063A (pt) 1987-12-01
GR3002942T3 (en) 1993-01-25
CA1267614A (en) 1990-04-10
EP0229288A2 (de) 1987-07-22
EP0229288A3 (en) 1989-02-08
KR920002034B1 (ko) 1992-03-10
KR870007038A (ko) 1987-08-14
FI86981C (fi) 1992-11-10
DK11087A (da) 1987-07-11
ES2024413B3 (es) 1992-03-01
DE3680500D1 (de) 1991-08-29
FI865370A0 (fi) 1986-12-31
GB2186254B (en) 1990-03-14
FI86981B (fi) 1992-07-31
CH657824A5 (de) 1986-09-30
DK11087D0 (da) 1987-01-09
US4700865A (en) 1987-10-20
GB8700260D0 (en) 1987-02-11
GB2186254A (en) 1987-08-12
JPH0329665B2 (fi) 1991-04-24
DK170875B1 (da) 1996-02-26
SU1524803A3 (ru) 1989-11-23
FI865370A (fi) 1987-07-11

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