| abstract |
The laminated packaging sheet comprises a primary layer (30) associated with a weldable layer (32) between which is interposed, in at least one marked area, a layer (34) of a permanent adhesive. Said sheet has, in a marked area where the permanent adhesive is present, a heat-sealing region allowing the sealing by thermal welding of the package and allowing the package to be closed after an initial opening. Said sheet has at least one marked region (36), a treatment ensuring gas permeability, the or each treated treated region (36) extends outside at least part of said heat-sealing region, the or each part of the heat-sealing region without treatment forming a region for initiating the opening of the package. |