초록 ▼

A method and machine for forming a case with polygonal section from a blank of sheet material. There is an assembly of panels. The assembly of panels is wound about a mandrel with polygonal section. The tongue is fixed to the free edge of the endmost panel. The flaps situated on the same side of the

A method and machine for forming a case with polygonal section from a blank of sheet material. There is an assembly of panels. The assembly of panels is wound about a mandrel with polygonal section. The tongue is fixed to the free edge of the endmost panel. The flaps situated on the same side of the panels are folded. The flaps thus folded are fixed together.

대표청구항 ▼

A method for forming a carton with polygonal section from a blank having a plurality of side wall panel elements (2 to 5) delineated by first bending lines (6 to 8) parallel to each other, including two end side wall panel elements (2 and 5) and at least one intermediate side wall panel element (3),

A method for forming a carton with polygonal section from a blank having a plurality of side wall panel elements (2 to 5) delineated by first bending lines (6 to 8) parallel to each other, including two end side wall panel elements (2 and 5) and at least one intermediate side wall panel element (3), and side flaps (11.2 to 11.5) intended to form the bottom of said carton and respectively connected to said side wall panel elements (2 to 5) by second bending lines (13.2 to 13.5) perpendicular to said first bending lines (6 to 8), the free edge of one of said end side wall panel element (2) of said blank having a tongue (9) connected to said one end side wall panel element (2) by a third bending line (10) parallel to said first bending lines (6 to 8), comprising the steps of: providing a mandrel (19) having an external section corresponding to the inner section of said carton and lateral faces (23 to 26) respectively corresponding to said end and intermediate side wall panel elements (2 to 5); placing said intermediate side wall panel element (3) approximately opposite the corresponding lateral face (24) of said mandrel (19), but at some distance (d) from said corresponding face (24); folding said side wall panel elements (2 and 4) respectively adjacent to said intermediate side wall panel element (3) around the respective first bending lines (6 and 7) joining the respective said adjacent sidewall panel elements to said intermediate sidewall panel element, in such a way that said adjacent side wall panel elements (2 and 4) or other (5) side wall panel elements connected to said adjacent side wall panel elements bear against said mandrel (19); pushing said intermediate side wall panel element (3) toward said corresponding face (24) of said mandrel, while maintaining said adjacent side wall panel elements or said other side wall panel elements in contact against said mandrel (19) and making free said intermediate side wall panel element (3) to shift in a direction parallel to said corresponding face of said mandrel and perpendicular to said first bending lines, so that said adjacent or other side wall panel elements assist in aligning said intermediate side wall panel element with said corresponding face of said mandrel; pressing said intermediate side wall panel element (3) against said corresponding lateral face (24); winding said blank around said mandrel so that each of the side wall panel elements is applied against the respective corresponding lateral face of said mandrel and so that said first bending lines bear against respective edges of said mandrel; fixing said tongue to said other end side wall panel element (5); and folding said side flaps (11.2 to 11.5) and fixing them together for forming the bottom of said carton.