EP0229288A2 - Boîte à ouverture par déchirage - Google Patents

Boîte à ouverture par déchirage Download PDF

Info

Publication number
EP0229288A2
EP0229288A2 EP86116716A EP86116716A EP0229288A2 EP 0229288 A2 EP0229288 A2 EP 0229288A2 EP 86116716 A EP86116716 A EP 86116716A EP 86116716 A EP86116716 A EP 86116716A EP 0229288 A2 EP0229288 A2 EP 0229288A2
Authority
EP
European Patent Office
Prior art keywords
starting
tab
tear strip
scoring
welding zone
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
EP86116716A
Other languages
German (de)
English (en)
Other versions
EP0229288B1 (fr
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/fr
Publication of EP0229288A3 publication Critical patent/EP0229288A3/de
Application granted granted Critical
Publication of EP0229288B1 publication Critical patent/EP0229288B1/fr
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

  • 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 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 then become a longitudinal one with the other seam welded, so that a cylindrical can body is created. 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 tear-open can part of the type described in the opening paragraph, in which the initial scoring is formed by a scoring line which extends across the tear-open strip and, if appropriate, around a short distance beyond each of the two scratches on the side of 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 scoring extends only transversely to the side scoring in a central region of the tear strip and extends in the vicinity of the two side scoring away from the free end of the tab, and that the welding zone near the the two scratches on the side covered the starting scratch.
  • the lengths of the essentially transverse section and the two essentially longitudinal sections of the starting score as well as the distance of their transverse section from the welding zone can be determined in this way based on simple tests on the sheet thickness and coordinate the other properties of the can part and the lug and make it dependent on the working accuracy of the available production facilities that even when the least favorable combination of all tolerances occurs, the welding zone securely covers the two longitudinal sections of the starting score, the welding zone overlapping with these longitudinal sections.
  • the part of the starting scoring lying between the overlapping 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 score has the shape of a bow which is convex to the free end of the flap and is more than two thirds to four fifths of the width of the tear strip.
  • the starting scoring can extend essentially parallel to the scoring on the sides, 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 scorings have the advantage that they tend very little break and thereby make the D osenteil unusable if this B iege- and / or is subjected to strain 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 occur when a filled can is deformed by 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.
  • Another alternative is that the field has several intersecting diagonal scratches.
  • the tab of a tear-open 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 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 in the preferred examples shown is approximately three quarters of the width of the tear strip 18.
  • the starting score 30 leaves produce 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 recess 38 is towards the free end 32 the tab 20 bounded by a corresponding arrow-shaped zone 40, which has a waffle-like surface structure slightly protruding from the rest of the underside of the tab.
  • the tab 20 is arranged when welded to the tear strip 18 so that its blunted end 36 a distance a of the order of two to three times from the central front section of the starting score 30 the sheet thickness of the can part.
  • 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 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)
  • Cookers (AREA)
  • Closures For Containers (AREA)
  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
  • Making Paper Articles (AREA)
EP19860116716 1986-01-10 1986-12-02 Boîte à ouverture par déchirage Expired - Lifetime EP0229288B1 (fr)

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 true EP0229288A2 (fr) 1987-07-22
EP0229288A3 EP0229288A3 (en) 1989-02-08
EP0229288B1 EP0229288B1 (fr) 1991-07-24

Family

ID=4178765

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860116716 Expired - Lifetime EP0229288B1 (fr) 1986-01-10 1986-12-02 Boîte à ouverture par déchirage

Country Status (14)

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

Families Citing this family (5)

* 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 (fr) * 1989-12-11 1991-06-19 Siegfried Frei Procédé de fabrication de lignes de déchirage au ruban de déchirage et au couvercles déchirables ainsi que procédé de fabrication d'une rupture de commencement au ruban de déchirage et boîte ainsi obtenue
EP1375356A1 (fr) * 2002-06-28 2004-01-02 Corus Staal BV Procédé permettant de fournir un récipient métallique rempli, fermé et traité thermiquement
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 (fr) * 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
GB2186254B (en) 1990-03-14
EP0229288B1 (fr) 1991-07-24
KR870007038A (ko) 1987-08-14
DK11087D0 (da) 1987-01-09
GB8700260D0 (en) 1987-02-11
JPS62235054A (ja) 1987-10-15
FI86981B (fi) 1992-07-31
FI865370A0 (fi) 1986-12-31
DK11087A (da) 1987-07-11
CH657824A5 (de) 1986-09-30
GR3002942T3 (en) 1993-01-25
CA1267614A (fr) 1990-04-10
FI865370L (fi) 1987-07-11
EP0229288A3 (en) 1989-02-08
ES2024413B3 (es) 1992-03-01
JPH0329665B2 (fr) 1991-04-24
KR920002034B1 (ko) 1992-03-10
SU1524803A3 (ru) 1989-11-23
DK170875B1 (da) 1996-02-26
US4700865A (en) 1987-10-20
BR8700063A (pt) 1987-12-01
FI86981C (fi) 1992-11-10
DE3680500D1 (de) 1991-08-29
GB2186254A (en) 1987-08-12

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