Patent ID: 6427420
Filing Date: 2002-08-06
Classification: B23K,B29C,B29L,B65B,B65D

Abstract:
A method for manufacturing a pack comprising a film having an upper plastic layer for forming an outer surface of said pack, a lower plastic layer for forming an inner surface of said pack, and a central light-metal layer positioned between said upper and said lower plastic layers, said method comprising the steps of:a. applying a laser beam to said lower plastic layer prior to forming said pack to produce a perforation forming a pre-cut line only in said lower plastic layer; b. forming said pack by welding a substantial portion of the edges of said film together, the remaining portion of unwelded edges forming an opening for filling said pack with contest; c. filling said pack with contents; and d. sealing said pack by welding the remaining portion of the edges together.