MACHINE AND PROCESS FOR MANUFACTURING A SLEEVE, AND SLEEVE THUS OBTAINED

摘要

The invention relates to a machine for manufacturing a sleeve, said sleeve having a body of frustoconical general shape, extending between a large base and a small base, said machine comprising at least one extrusion die (2) having an annular injection orifice (22) and an injection head (3) having an annular cavity (30), the head and the die being mounted so that they can be moved between, on the one hand, a closed-up position in which the annular injection orifice (22) communicates with the annular cavity (30), so as to inject material into said annular cavity (30), and, on the other hand, a moved-away position making it possible, during the movement away, to extrude a tube (7) of material. According to the invention, the external perimeter of the annular cavity (30) of the injection head (3) is greater than the external perimeter of the annular injection orifice (22) of the extrusion die (2).