Method and machine for wrapping a product in a sheet of heat-seal wrapping material

摘要

A method and machine (1) for wrapping a product (2) in a sheet (3) of heat-seal wrapping material, whereby the sheet (3) of wrapping material is folded onto the product (2) so that one portion (70;71) of the sheet (3) of wrapping material is at least partly superimposed on at least another portion (71; 70) of the sheet (3) of wrapping material; a sealing surface (66;59) of a sealing head (36;53) is brought into contact with the superimposed portions (70;71) at a given lead-in temperature (T1), and is maintained contacting the superimposed portions (70;71) for a given time interval during which the temperature of the sealing surface (66;59) is gradually increased to a given working value (T2), and is once more restored to the lead-in value (T1) once the sheet (3) of wrapping material is released. <IMAGE> <IMAGE>