Process for the application of closing pieces for bags during their continuous process manufacturing

摘要

This process is applicable to automatic packaging machines which include a continuous shaping device for bags made from a flexible sheet of thermoweldable material bent into a "U" shape to form two equal walls (1) facing each other. The process comprises: a phase of forming the bag bottom (3); a phase of welding (5) the upper end of the walls (1) over a short length; a cutting phase (8,9) to form an incut (12) having an inclined portion (16) in the walls (1); a phase of removal of welded portions (11) defined by the incut; a phase of separation of walls (1); a phase of application of a closing device (15); a phase of securing the closing device (15); a phase of welding the closing device (15) to said inclined portions (16); and a phase of forming the side of the bag. <IMAGE>