Abstract: A machine for making outer envelopes (101) in which a filter bag (103) for an infusion product is wrapped in an overwrapping (S) comprises: stations for making the filter bags (103), means (106) for moving the filter bag (103) towards a station (107) for wrapping a sheet (S) of overwrapping material around the filter bag (103); and a station (109) for closing longitudinal end edges (S1, S2) and a transversal end edge (S3) of the “U”-wrapped sheet (S) to form an outer envelope (101); the closing station (109) comprises a joining carrousel (110) equipped with a plurality of sealing elements (112) which are movable in rotation with the joining carrousel (110) and designed to receive respective single filter bags (103) with the folded overwrapping sheet (S) and to allow simultaneous closing of the longitudinal edges (S1, S2) and the transversal edge (S3) of the sheet (S).

Abstract: A machine for making outer envelopes (101) in which a filter bag (103) for an infusion product is wrapped in an overwrapping (S) comprises: stations for making the filter bags (103), means (106) for moving the filter bag (103) towards a station (107) for wrapping a sheet (S) of overwrapping material around the filter bag (103); and a station (109) for closing longitudinal end edges (S1, S2) and a transversal end edge (S3) of the “U”-wrapped sheet (S) to form an outer envelope (101); the closing station (109) comprises a joining carrousel (110) equipped with a plurality of sealing elements (112) which are movable in rotation with the joining carrousel (110) and designed to receive respective single filter bags (103) with the folded overwrapping sheet (S) and to allow simultaneous closing of the longitudinal edges (S1, S2) and the transversal edge (S3) of the sheet (S).