Abstract: The invention proposes a cutting device for cutting a material, comprising a cutting wire (3) having two ends, each end being connected to a winding drum (1a, 1b), the wire (3) being tensioned, the wire (3) being conductive and having a voltage applied to it in order to heat. This cutting device is characterized in that the wire (3) is unwinding at the moment of cutting, with winding around a first drum (1a) taking place simultaneously to unwinding from a second drum (1b), the device having a dry cutting zone (2) in which is located an unwinding section of wire (3) able to cut the material coming into contact with it, the two drums (1a, 1b) being driven in rotation by two different motors (4).

Abstract: The invention relates to a plant (10) for blowing a pressure medium in a blank (12), which comprises a mould (12) which is used for receiving the blank (12) and comprises a top wall (24) trough which the neck (16) of the blank (12) is projected, a nozzle (22) which comprises a pressure medium lower output orifice (34) and is provided with an ring sealing joint (40) arranged under the lower circumference (44) of said output orifice (34) in such a way that the circumference (44) of the output orifice (34) surrounds the neck (16) of the blank (12). Said invention is characterised in that the sealing joint (40) is provided with a lower elastic annular lip (48) in such a way that the pressure medium rests on the top face (54) of said lip (48) for pressing the free annular lower edge (58) thereof against a supporting wall (18, 24), thereby ensuring the tightness of the nozzle (22).