초록 ▼

The invention relates to a method for the manufacture of a pack, particularly intended for undergoing preservation treatment, from at least one film (10) comprising two plastic layers, an upper (11) and a lower (12), which form the outer and inner faces of said pack, and a light-metal central layer

The invention relates to a method for the manufacture of a pack, particularly intended for undergoing preservation treatment, from at least one film (10) comprising two plastic layers, an upper (11) and a lower (12), which form the outer and inner faces of said pack, and a light-metal central layer (13) sandwiched between said upper and lower layers. According to the invention, prior to the operations to make said pack, a laser beam is applied solely to the lower layer of said film, said lower layer forming the inner face of said pack, in order to produce, virtually in the entire thickness of said lower layer, at least one perforation (14) forming at least one precut line.

대표청구항 ▼

1. 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 co

1. 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.