B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
B65D 6/30 (2006.01) B21D 51/30 (2006.01) B29C 57/12 (2006.01) B65B 51/14 (2006.01) B65D 6/34 (2006.01) B29C 65/56 (2006.01)
Patent
CA 2055487
A container or can (10) having a body (12) and end portion (32) which include free ends (18 and 38) comprising plastic materials and which are joined and sealed by cooperatively curling juxtapositioned free ends. The method and apparatus of the in- vention forms the body portion (12) with an opening surrounded by a free end (18) suitable for curling and forms the end portion with a central portion surrounded by a free end suitable for curling. The container body (12) and end portion (32) are joined by juxtaposing their free ends (18 and 38) for forming a plurality of walls, then the plastic in at least one of the free ends is provided in a condition at the time of curling which allows stress and related elastic strain and memory to be imparted to the plas- tic, followed by curling with a curling tool (50) to intimately engage the ends and con- currently curl the perimeters thereof into a tightly curled configuration (48), wherein at least the one free end includes internal stress and related strain and memory for providing a seam of integrity and reliability.
Sim & Mcburney
Zapata Innovative Closures Inc.
LandOfFree
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