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
  • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
  • B65D17/404—Details of the lines of weakness

Definitions

• An easy opening closure is a metal closure in which an opening may be formed by using one or more fingers and without the requirement for using tools.
• An easy opening closure comprises a closure having a folding rim to be connected to an open end container, and a 0 circumferential score line provided in the closure and enclosing a removable central closure part.
• This central closure part is provided with a tab which is connected using a rivet to the central closure part. This tab is used for providing an opening in the easy opening closure 5 by popping, tearing off and subsequently loosing the central closure part along the score line from the remaining part of the closure .
• this upwardly extending free end of the tab is gripped by one or more fingers and the other part of the central closure is torn loose along the score line.
• the score opens simultaneously in a clock-wise and anti-clock-wi.se direction of the score line .
• the final part of the opening procedure is the tearing off the central closure at the diametral position to the pop ignition zone.
• a metal easy opening closure has a thickness of about 0.17 to 0.30mm. A more specific value of this thickness is dependent on the type of metal of the closure, such as aluminum and tin plate.
• the so called score residual is generally in the range of 50-90 ⁇ m again dependent on the type of metal used and the content of (pressure in) the container.
• the score residual is conventionally transversally measured in the score line. In a practical embodiment the score residual resides between score lines formed in both surfaces of the closure. If these score lines are not aligned, then the score residual is measured as the shortest distance between the two score lines.
• both sides of the easy opening closure is provided with a lacquer having a thickness of about 0.01 mm.
• This reduction in score residual is maximum at the beginning of the tear ignition zones.
• This reduction in the score residual may have the form of an abrupt step or may gradually decrease over a part of the pop zone, but reaches the maximum at least at the transition between the pop zone and the adjacent tear ignition zone.
• This reduction in score residual (t) is relative to the score residual in the pop ignition zone, which is generally having a higher or highest score residual in order to impart the easy opening closure with abuse-proof properties .
• the score residual in the pop ignition zone is higher than in the remainder of the pop zone. Accordingly, the pop force for the initial popping the central closure part is increased but to a level which is still below the maximum initial tear force.
• the reduction of the score residual is maximum and amounts 8 ⁇ m in this embodiment of the closure and forms a plateau 23.
• the score residual t gradually decreases to the plateau 23 in the pop zones (between the respective lines 12 and 14, and 11 and 13) and in the tear ignition zones 15 and 16 gradually increases (curve A) .
• the reduction of the score residual may stay substantially constant in the tear zones 19 and 20 but decrease gradually towards a hinge zone 21 where the scored central point is broken off from the closure (curve B) .
• the residual may be increased to about 70 ⁇ m to make the closure more abuse- proof.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Closures For Containers (AREA)
• Containers Opened By Tearing Frangible Portions (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8181192

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (9)

Citations (11)

Family Cites Families (3)

• 2001
  • 2001-11-06 EP EP01204232A patent/EP1308226A1/en not_active Withdrawn
• 2002
  • 2002-10-09 CA CA002465963A patent/CA2465963A1/en not_active Abandoned
  • 2002-10-09 US US10/494,642 patent/US20050082291A1/en not_active Abandoned
  • 2002-10-09 CN CNB028238877A patent/CN1286594C/zh not_active Expired - Fee Related
  • 2002-10-09 JP JP2003541667A patent/JP2005507833A/ja active Pending
  • 2002-10-09 MX MXPA04004259A patent/MXPA04004259A/es unknown
  • 2002-10-09 WO PCT/EP2002/011341 patent/WO2003039785A1/en active Application Filing

Patent Citations (11)

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