Method for making easy-open lids with improved scoring

摘要

PCT No. PCT/FR96/00571 Sec. 371 Date Nov. 21, 1997 Sec. 102(e) Date Nov. 21, 1997 PCT Filed Apr. 15, 1996 PCT Pub. No. WO96/32334 PCT Pub. Date Oct. 17, 1996A process for forming an easy open lid comprising a central panel having a score strip with a score thereon, a crimping edge and a ring enabling the lid to be opened by perforation of the score. The score on the lid is formed from a metal lid outline supported by an anvil by displacing a punch of angle alpha thereover and causing an asymmetrical flow of metal between the punch and the anvil during the displacing. This reduces the risk of crack formation in the metal at the bottom portion of the score or beneath the score.