Moulding unit for a plant for blow-moulding plastic containers, particularly bottles

A moulding unit for a plant for blow-moulding plastic containers (2), particularly bottles, from respective parisons (3), the moulding unit being movable along an annular path (P) and comprising two half-moulds (17a, 17b) positioned one on the inside and the other on the outside of the path (P), the half-mould (17b) on the outside being movable about a substantially vertical pivot axis (18) relative to the half-mould (17a) on the inside between a position of opening and a position of closing at least two cavities (19) for blow-moulding respective containers (2);

• the two half-moulds (17a,17b) defining a closing plane (20) that is substantially tangent to the path (P), wherein both half-moulds (17a, 17b) are movable away from each other through different angles between respective open and closed positions, the angle of movement of the half-mould (17b) on the outside towards the outside of the path (P) being greater than the angle of movement of the half-mould (17a) on the inside towards the inside of the path (P),
• wherein the half-mould (17a) on the inside of the path (P), in the respective open position, is rotated a predetermined angle apart from a position of finished blow moulded articles, inwardly with respect to said closing plane (20) that is substantially tangent to the path (P).